id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1211.2835 | Florian Staub | Kai Schmidt-Hoberg, Florian Staub, Martin Wolfgang Winkler | Enhanced diphoton rates at Fermi and the LHC | 23 pages, 4 figures; v2: extended discussion of benchmark scenario.
Matches version published in JHEP | JHEP01(2013)124 | 10.1007/JHEP01(2013)124 | CERN-PH-TH/2012-301, Bonn-TH-2012-29, DESY 12-203 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that within MSSM singlet extensions the experimental hints beyond the
standard model from the Fermi LAT telescope as well as from the LHC can be
explained simultaneously while being consistent with all experimental
constraints. In particular we present an example point which features a $\sim$
130 GeV lightest neutralino with an annihilation cross section into photons
consistent with the indication from the Fermi satellite with simultaneously the
right relic abundance, a continuum photon spectrum consistent with observation,
direct detection cross section below the experimental limits, electroweak
observables consistent with experiment and a 125 GeV light Higgs boson with a
slightly enhanced $h \rightarrow \gamma \gamma$ rate.
| [
{
"created": "Mon, 12 Nov 2012 21:36:25 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Jan 2013 10:57:25 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Schmidt-Hoberg",
"Kai",
""
],
[
"Staub",
"Florian",
""
],
[
"Winkler",
"Martin Wolfgang",
""
]
] | We show that within MSSM singlet extensions the experimental hints beyond the standard model from the Fermi LAT telescope as well as from the LHC can be explained simultaneously while being consistent with all experimental constraints. In particular we present an example point which features a $\sim$ 130 GeV lightest neutralino with an annihilation cross section into photons consistent with the indication from the Fermi satellite with simultaneously the right relic abundance, a continuum photon spectrum consistent with observation, direct detection cross section below the experimental limits, electroweak observables consistent with experiment and a 125 GeV light Higgs boson with a slightly enhanced $h \rightarrow \gamma \gamma$ rate. |
hep-ph/0111014 | Krishnamoorthy Sridhar | B.C. Allanach, S. Lola and K. Sridhar (CERN) | Explaining Anomalous CDF mu gamma Missing-E_T Events With Supersymmetry | 5 pages, Latex file including 3 figures (axodraw.sty style file
attached). Version to appear in Phys. Rev. Lett. Substantial changes such as
addition of kinematical fit regions and best-fit point | Phys.Rev.Lett.89:011801,2002 | 10.1103/PhysRevLett.89.011801 | CERN-TH/2001-303 | hep-ph hep-ex | null | CDF recently reported an excess of events in the mu-gamma-missing E_T channel
that disagrees with the Standard Model prediction. No such excess was observed
in the e-gamma-mett channel. We explain the excess via resonant smuon
production with a single dominant R-parity violating coupling lambda'_{211}, in
the context of models where the gravitino is the lightest supersymmetric
particle. The slepton decays to the lightest neutralino and a muon followed by
neutralino decaying to a gravitino and photon. We determine a viable region of
parameter space that fits the kinematical distributions of the Run I excess and
illustrate the effect by examining the best fit point in detail. We provide
predictions for an excess in the missing E_T and photon channel at Run I and
Run II. Run II will decisively rule out or confirm our scenario.
| [
{
"created": "Thu, 1 Nov 2001 18:09:53 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Nov 2001 18:18:30 GMT",
"version": "v2"
},
{
"created": "Sat, 3 Nov 2001 08:28:20 GMT",
"version": "v3"
},
{
"created": "Wed, 22 May 2002 19:50:29 GMT",
"version": "v4"
}
] | 2011-03-23 | [
[
"Allanach",
"B. C.",
"",
"CERN"
],
[
"Lola",
"S.",
"",
"CERN"
],
[
"Sridhar",
"K.",
"",
"CERN"
]
] | CDF recently reported an excess of events in the mu-gamma-missing E_T channel that disagrees with the Standard Model prediction. No such excess was observed in the e-gamma-mett channel. We explain the excess via resonant smuon production with a single dominant R-parity violating coupling lambda'_{211}, in the context of models where the gravitino is the lightest supersymmetric particle. The slepton decays to the lightest neutralino and a muon followed by neutralino decaying to a gravitino and photon. We determine a viable region of parameter space that fits the kinematical distributions of the Run I excess and illustrate the effect by examining the best fit point in detail. We provide predictions for an excess in the missing E_T and photon channel at Run I and Run II. Run II will decisively rule out or confirm our scenario. |
2307.15815 | Tom Steele | T. de Oliveira, D. Harnett, R. Kleiv, A. Palameta, T.G. Steele | Light-Quark $SU(3)$ Flavour Splitting of Heavy-Light Constituent Diquark
Masses and Doubly-Strange Diquarks from QCD Sum-Rules | 30 pages, 19 figures, 7 tables. v2 contains extended discussion | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | QCD Laplace sum-rules are used to examine the constituent mass spectrum of
$J^P\in\{0^+,1^+\}$ heavy-light [Qq] diquarks with $Q\in\{c,b\}$ and
$q\in\{u,d,s\}$. As in previous sum-rule studies, the negative parity
$J^P\in\{0^-, 1^-\}$ [Qq] diquark mass predictions do not stabilize, so the
sum-rule analysis focuses on positive parity [Qq] diquarks. Doubly-strange
$J^P=1^{+}$ [ss] diquarks are also examined, but the resulting sum rules do not
stabilize. Hence there is no sum-rule evidence for $J^P=1^{+}$ [ss] diquark
states, aiding the interpretation of sum-rule analyses of fully-strange
tetraquark states. The SU(3) flavour splitting effects for [Qq] diquarks are
obtained by calculating QCD correlation functions of $J^P\in\{0^+,1^+\}$
diquark composite operators up to next-to-leading order in perturbation theory,
leading-order in the strange quark mass, and in the chiral limit for
non-strange (u,d) quarks with an isospin-symmetric vacuum $<\bar nn>=<\bar
uu>=<\bar dd>$. Apart from the strange quark mass parameter $m_s$, the strange
quark condensate parameter $\kappa=<\bar ss>/<\bar nn>$ has an important impact
on SU(3) flavour splittings. A Laplace sum-rule analysis methodology is
developed for the mass difference $M_{[Qs]}-M_{[Qn]}$ between the strange and
non-strange heavy-light diquarks to reduce the theoretical uncertainties from
all other QCD input parameters. The mass splitting is found to decrease with
increasing $\kappa$, providing an upper bound on $\kappa$ where the
$M_{[Qs]}-M_{[Qn]}$ mass hierarchy reverses. In the typical QCD sum-rule range
$0.56<\kappa< 0.74$, $55~MeV < M_{[cs]}-M_{[cn]} < 100~MeV$ and $75~MeV <
M_{[bs]}-M_{[bn]}< 150~MeV$, with a slight tendency for larger splittings for
the $J^P=1^+$ channels. These constituent mass splitting results are discussed
in comparison with values used in constituent diquark models for tetraquark and
pentaquark hadronic states.
| [
{
"created": "Fri, 28 Jul 2023 21:14:17 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Sep 2023 15:05:49 GMT",
"version": "v2"
}
] | 2023-10-02 | [
[
"de Oliveira",
"T.",
""
],
[
"Harnett",
"D.",
""
],
[
"Kleiv",
"R.",
""
],
[
"Palameta",
"A.",
""
],
[
"Steele",
"T. G.",
""
]
] | QCD Laplace sum-rules are used to examine the constituent mass spectrum of $J^P\in\{0^+,1^+\}$ heavy-light [Qq] diquarks with $Q\in\{c,b\}$ and $q\in\{u,d,s\}$. As in previous sum-rule studies, the negative parity $J^P\in\{0^-, 1^-\}$ [Qq] diquark mass predictions do not stabilize, so the sum-rule analysis focuses on positive parity [Qq] diquarks. Doubly-strange $J^P=1^{+}$ [ss] diquarks are also examined, but the resulting sum rules do not stabilize. Hence there is no sum-rule evidence for $J^P=1^{+}$ [ss] diquark states, aiding the interpretation of sum-rule analyses of fully-strange tetraquark states. The SU(3) flavour splitting effects for [Qq] diquarks are obtained by calculating QCD correlation functions of $J^P\in\{0^+,1^+\}$ diquark composite operators up to next-to-leading order in perturbation theory, leading-order in the strange quark mass, and in the chiral limit for non-strange (u,d) quarks with an isospin-symmetric vacuum $<\bar nn>=<\bar uu>=<\bar dd>$. Apart from the strange quark mass parameter $m_s$, the strange quark condensate parameter $\kappa=<\bar ss>/<\bar nn>$ has an important impact on SU(3) flavour splittings. A Laplace sum-rule analysis methodology is developed for the mass difference $M_{[Qs]}-M_{[Qn]}$ between the strange and non-strange heavy-light diquarks to reduce the theoretical uncertainties from all other QCD input parameters. The mass splitting is found to decrease with increasing $\kappa$, providing an upper bound on $\kappa$ where the $M_{[Qs]}-M_{[Qn]}$ mass hierarchy reverses. In the typical QCD sum-rule range $0.56<\kappa< 0.74$, $55~MeV < M_{[cs]}-M_{[cn]} < 100~MeV$ and $75~MeV < M_{[bs]}-M_{[bn]}< 150~MeV$, with a slight tendency for larger splittings for the $J^P=1^+$ channels. These constituent mass splitting results are discussed in comparison with values used in constituent diquark models for tetraquark and pentaquark hadronic states. |
2307.06208 | Jan Hajer | Stefan Antusch, Jan Hajer, and Johannes Rosskopp | Decoherence effects on lepton number violation from heavy
neutrino-antineutrino oscillations | 41 pages, 10 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study decoherence effects and phase corrections in heavy
neutrino-antineutrino oscillations (NNOs), based on quantum field theory with
external wave packets. Decoherence damps the oscillation pattern, making it
harder to resolve experimentally. Additionally, it enhances lepton number
violation (LNV) for processes in symmetry-protected low-scale seesaw models by
reducing the destructive interference between mass eigenstates. We discuss a
novel time-independent shift in the phase and derive formulae for calculating
decoherence effects and the phase shift in the relevant regimes, which are the
no dispersion regime and transverse dispersion regime. We find that the phase
shift can be neglected in the parameter region under consideration since it is
small apart from parameter regions with large damping. In the oscillation
formulae, decoherence can be included by an effective damping parameter. We
discuss this parameter and present averaged results, which apply to simulations
of NNOs in the dilepton-dijet channel at the HL-LHC. We show that including
decoherence effects can dramatically change the theoretical prediction for the
ratio of LNV over LNC events.
| [
{
"created": "Wed, 12 Jul 2023 14:53:18 GMT",
"version": "v1"
}
] | 2023-07-13 | [
[
"Antusch",
"Stefan",
""
],
[
"Hajer",
"Jan",
""
],
[
"Rosskopp",
"Johannes",
""
]
] | We study decoherence effects and phase corrections in heavy neutrino-antineutrino oscillations (NNOs), based on quantum field theory with external wave packets. Decoherence damps the oscillation pattern, making it harder to resolve experimentally. Additionally, it enhances lepton number violation (LNV) for processes in symmetry-protected low-scale seesaw models by reducing the destructive interference between mass eigenstates. We discuss a novel time-independent shift in the phase and derive formulae for calculating decoherence effects and the phase shift in the relevant regimes, which are the no dispersion regime and transverse dispersion regime. We find that the phase shift can be neglected in the parameter region under consideration since it is small apart from parameter regions with large damping. In the oscillation formulae, decoherence can be included by an effective damping parameter. We discuss this parameter and present averaged results, which apply to simulations of NNOs in the dilepton-dijet channel at the HL-LHC. We show that including decoherence effects can dramatically change the theoretical prediction for the ratio of LNV over LNC events. |
1109.4494 | Gianluca Inguglia | Gianluca Inguglia | CP Violation in Charm: a New Method | 10 pages, 2 figures, 4 tables, contribution to the proceedings of the
"Ettore Majorana International School of Subnuclear Physics 2011" | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose for the first time a method to perform analysis of time-dependent
CP asymmetries in charm by using both, correlated and un-correlated $D^0$
mesons. Here we consider the decay channels $D^0\to K^+ K^-$ and $D^0\to \pi^+
\pi^-$. The channel $D^0\to K^+ K^-$ will be used to measure the mixing phase,
and the difference between the measured phase $D^0\to K^+ K^-$ and $D^0\to
\pi^+ \pi^-$ will open the door to the first measurement of $\beta_c$, one of
the angle of the charm unitarity triangle. Since in the standard model CP
asymmetries in charm are expected to be small, any observation of large time
dependent asymmetries or mismatch between predicted and observed value for $
\beta_c$ could signify new physics. We perform and show results of numerical
analysis made considering Super$B$ running at charm threshold, Super$B$ running
at $\Upsilon(4S)$ and LHCb and find that Super$B$ and LHCb will be able to
measure $\beta_{c,eff}$ with a precision of $1.3^\circ$ and $1.4^\circ$
respectively. The same analysis shows that $\phi_{MIX}$ could be measured at
Super$B$ with a precision of $1.3^\circ$.
| [
{
"created": "Wed, 21 Sep 2011 09:54:02 GMT",
"version": "v1"
}
] | 2011-09-22 | [
[
"Inguglia",
"Gianluca",
""
]
] | We propose for the first time a method to perform analysis of time-dependent CP asymmetries in charm by using both, correlated and un-correlated $D^0$ mesons. Here we consider the decay channels $D^0\to K^+ K^-$ and $D^0\to \pi^+ \pi^-$. The channel $D^0\to K^+ K^-$ will be used to measure the mixing phase, and the difference between the measured phase $D^0\to K^+ K^-$ and $D^0\to \pi^+ \pi^-$ will open the door to the first measurement of $\beta_c$, one of the angle of the charm unitarity triangle. Since in the standard model CP asymmetries in charm are expected to be small, any observation of large time dependent asymmetries or mismatch between predicted and observed value for $ \beta_c$ could signify new physics. We perform and show results of numerical analysis made considering Super$B$ running at charm threshold, Super$B$ running at $\Upsilon(4S)$ and LHCb and find that Super$B$ and LHCb will be able to measure $\beta_{c,eff}$ with a precision of $1.3^\circ$ and $1.4^\circ$ respectively. The same analysis shows that $\phi_{MIX}$ could be measured at Super$B$ with a precision of $1.3^\circ$. |
2207.12413 | Jack Shergold | Martin Bauer and Jack D. Shergold | Limits on the cosmic neutrino background | 71 pages, 15 figures. Aligned with version published in JCAP | JCAP 01 (2023), 003 | 10.1088/1475-7516/2023/01/003 | IPPP/22/55 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first comprehensive discussion of constraints on the cosmic
neutrino background (C$\nu$B) overdensity, including theoretical, experimental
and cosmological limits for a wide range of neutrino masses and temperatures.
Additionally, we calculate the sensitivities of future direct and indirect
relic neutrino detection experiments and compare the results with the existing
constraints, extending several previous analyses by taking into account that
the C$\nu$B reference frame may not be aligned with that of the Earth. The
Pauli exclusion principle strongly disfavours overdensities $\eta_\nu \gg 1$ at
small neutrino masses, but allows for overdensities $\eta_{\nu}\lesssim 125$ at
the KATRIN mass bound $m_{\nu} \simeq 0.8\,\mathrm{eV}$. On the other hand,
cosmology strongly favours $0.2 \lesssim \eta_{\nu} \lesssim 3.5$ in all
scenarios. We find that direct detection proposals are capable of observing the
C$\nu$B without a significant overdensity for neutrino masses $m_{\nu} \gtrsim
50\,\mathrm{meV}$, but require an overdensity $\eta_{\nu} \gtrsim 3\times 10^5$
outside of this range. We also demonstrate that relic neutrino detection
proposals are sensitive to the helicity composition of the C$\nu$B, whilst some
may be able to distinguish between Dirac and Majorana neutrinos.
| [
{
"created": "Mon, 25 Jul 2022 18:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Sep 2022 16:29:34 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Jan 2023 16:43:31 GMT",
"version": "v3"
}
] | 2023-01-18 | [
[
"Bauer",
"Martin",
""
],
[
"Shergold",
"Jack D.",
""
]
] | We present the first comprehensive discussion of constraints on the cosmic neutrino background (C$\nu$B) overdensity, including theoretical, experimental and cosmological limits for a wide range of neutrino masses and temperatures. Additionally, we calculate the sensitivities of future direct and indirect relic neutrino detection experiments and compare the results with the existing constraints, extending several previous analyses by taking into account that the C$\nu$B reference frame may not be aligned with that of the Earth. The Pauli exclusion principle strongly disfavours overdensities $\eta_\nu \gg 1$ at small neutrino masses, but allows for overdensities $\eta_{\nu}\lesssim 125$ at the KATRIN mass bound $m_{\nu} \simeq 0.8\,\mathrm{eV}$. On the other hand, cosmology strongly favours $0.2 \lesssim \eta_{\nu} \lesssim 3.5$ in all scenarios. We find that direct detection proposals are capable of observing the C$\nu$B without a significant overdensity for neutrino masses $m_{\nu} \gtrsim 50\,\mathrm{meV}$, but require an overdensity $\eta_{\nu} \gtrsim 3\times 10^5$ outside of this range. We also demonstrate that relic neutrino detection proposals are sensitive to the helicity composition of the C$\nu$B, whilst some may be able to distinguish between Dirac and Majorana neutrinos. |
hep-ph/0510289 | Francois Goffinet | J.-M. Gerard, F. Goffinet and M. Herquet | A New Look at an Old Mass Relation | 8 pages, 2 figures | Phys.Lett. B633 (2006) 563-566 | 10.1016/j.physletb.2005.12.054 | UCL-IPT-05-11 | hep-ph hep-ex | null | New data from neutrino oscillation experiments motivate us to extend a
successful mass relation for the charged leptons to the other fundamental
fermions. This new universal relation requires a Dirac mass around 3 10^-2 eV
for the lightest neutrino and rules out a maximal atmospheric mixing. It also
suggests a specific decomposition of the CKM mixing matrix.
| [
{
"created": "Fri, 21 Oct 2005 14:36:47 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Gerard",
"J. -M.",
""
],
[
"Goffinet",
"F.",
""
],
[
"Herquet",
"M.",
""
]
] | New data from neutrino oscillation experiments motivate us to extend a successful mass relation for the charged leptons to the other fundamental fermions. This new universal relation requires a Dirac mass around 3 10^-2 eV for the lightest neutrino and rules out a maximal atmospheric mixing. It also suggests a specific decomposition of the CKM mixing matrix. |
1709.01930 | Matthew Kirk | Thomas Jubb, Matthew Kirk, Alexander Lenz | Charming Dark Matter | 46 pages, 22 figures. v2: published version | JHEP12(2017)010 | 10.1007/JHEP12(2017)010 | IPPP/17/64 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have considered a model of Dark Minimal Flavour Violation (DMFV), in which
a triplet of dark matter particles couple to right-handed up-type quarks via a
heavy colour-charged scalar mediator. By studying a large spectrum of possible
constraints, and assessing the entire parameter space using a Markov Chain
Monte Carlo (MCMC), we can place strong restrictions on the allowed parameter
space for dark matter models of this type.
| [
{
"created": "Wed, 6 Sep 2017 18:00:02 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Dec 2017 17:12:37 GMT",
"version": "v2"
}
] | 2017-12-05 | [
[
"Jubb",
"Thomas",
""
],
[
"Kirk",
"Matthew",
""
],
[
"Lenz",
"Alexander",
""
]
] | We have considered a model of Dark Minimal Flavour Violation (DMFV), in which a triplet of dark matter particles couple to right-handed up-type quarks via a heavy colour-charged scalar mediator. By studying a large spectrum of possible constraints, and assessing the entire parameter space using a Markov Chain Monte Carlo (MCMC), we can place strong restrictions on the allowed parameter space for dark matter models of this type. |
1309.6318 | Christoph Englert | Alan J. Barr, Matthew J. Dolan, Christoph Englert, Michael Spannowsky | Di-Higgs final states augMT2ed -- selecting $hh$ events at the high
luminosity LHC | 6 pages, 2 figures, 1 table | null | 10.1016/j.physletb.2013.12.011 | IPPP/13/74, DCPT/13/148 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Higgs boson self-interactions can be investigated via di-Higgs ($pp\to hh+X$)
production at the LHC. With a small ${\cal{O}}(30)$ fb Standard Model
production cross section, and a large $t\bar t$ background, this measurement
has been considered challenging, even at a luminosity-upgraded LHC. We
demonstrate that by using simple kinematic bounding variables, of the sort
already employed in existing LHC searches, the dominant $t\bar t$ background
can be largely eliminated. Simulations of the signal and the dominant
background demonstrate the prospect for measurement of the di-Higgs production
cross section at the 30% level using 3/ab of integrated luminosity at a
high-luminosity LHC. This corresponds to a Higgs self-coupling determination
with 60% accuracy in the $b\bar b \tau^+\tau^-$ mode, with potential for
further improvements from e.g. subjet technologies and from additional di-Higgs
decay channels.
| [
{
"created": "Tue, 24 Sep 2013 20:00:02 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Barr",
"Alan J.",
""
],
[
"Dolan",
"Matthew J.",
""
],
[
"Englert",
"Christoph",
""
],
[
"Spannowsky",
"Michael",
""
]
] | Higgs boson self-interactions can be investigated via di-Higgs ($pp\to hh+X$) production at the LHC. With a small ${\cal{O}}(30)$ fb Standard Model production cross section, and a large $t\bar t$ background, this measurement has been considered challenging, even at a luminosity-upgraded LHC. We demonstrate that by using simple kinematic bounding variables, of the sort already employed in existing LHC searches, the dominant $t\bar t$ background can be largely eliminated. Simulations of the signal and the dominant background demonstrate the prospect for measurement of the di-Higgs production cross section at the 30% level using 3/ab of integrated luminosity at a high-luminosity LHC. This corresponds to a Higgs self-coupling determination with 60% accuracy in the $b\bar b \tau^+\tau^-$ mode, with potential for further improvements from e.g. subjet technologies and from additional di-Higgs decay channels. |
0812.3968 | Betti Hartmann | Yves Brihaye (Universite de Mons, Belgium) and Betti Hartmann (Jacobs
University Bremen, Germany) | Angularly excited and interacting boson stars and Q-balls | 20 pages including 9 figures; for higher quality figures please
contact the authors; v2: minor changes, final version to appear in Phys. Rev.
D | Phys.Rev.D79:064013,2009 | 10.1103/PhysRevD.79.064013 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study angularly excited as well as interacting non-topological solitons,
so-called Q-balls and their gravitating counterparts, so-called boson stars in
3+1 dimensions. Q-balls and boson stars carry a non-vanishing Noether charge
and arise as solutions of complex scalar field models in a flat space-time
background and coupled minimally to gravity, respectively.
We present examples of interacting Q-balls that arise due to angular
excitations, which are closely related to the spherical harmonics. We also
construct explicit examples of rotating boson stars that interact with
non-rotating boson stars. We observe that rotating boson stars tend to absorb
the non-rotating ones for increasing, but reasonably small gravitational
coupling. This is a new phenomenon as compared to the flat space-time limit and
is related to the negative contribution of the rotation term to the energy
density of the solutions. In addition, our results indicate that a system of a
rotating and non-rotating boson star can become unstable if the direct
interaction term in the potential is large enough. This instability is related
to the appearance of ergoregions.
| [
{
"created": "Sat, 20 Dec 2008 14:32:47 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Feb 2009 06:59:06 GMT",
"version": "v2"
}
] | 2010-04-15 | [
[
"Brihaye",
"Yves",
"",
"Universite de Mons, Belgium"
],
[
"Hartmann",
"Betti",
"",
"Jacobs\n University Bremen, Germany"
]
] | We study angularly excited as well as interacting non-topological solitons, so-called Q-balls and their gravitating counterparts, so-called boson stars in 3+1 dimensions. Q-balls and boson stars carry a non-vanishing Noether charge and arise as solutions of complex scalar field models in a flat space-time background and coupled minimally to gravity, respectively. We present examples of interacting Q-balls that arise due to angular excitations, which are closely related to the spherical harmonics. We also construct explicit examples of rotating boson stars that interact with non-rotating boson stars. We observe that rotating boson stars tend to absorb the non-rotating ones for increasing, but reasonably small gravitational coupling. This is a new phenomenon as compared to the flat space-time limit and is related to the negative contribution of the rotation term to the energy density of the solutions. In addition, our results indicate that a system of a rotating and non-rotating boson star can become unstable if the direct interaction term in the potential is large enough. This instability is related to the appearance of ergoregions. |
hep-ph/0203207 | Huo WuJun | Wu-Jun Huo and Tai-Fu Feng (IHEP, Cas, China) | Lepton flavor violation decays with the fourth generation neutrino | 9 pages, 4 figures, submitted to PHys. Lett. B | null | null | null | hep-ph | null | We investigate the lepton flavor violation decays, $\tau \to \mu\gamma$,
$\tau \to e\gamma$ and $\mu \to e\gamma$, in the framwork of a squential fourth
generation model with a heavy fourth neutrino, $\nu'$. Using the recent
experimental bounds, we can obtain the constraints of the $4\times 4$ leptonic
mixing matrix element factors, $V_{1\nu'},V_{2\nu'}$ and $V_{3\nu'}$. We find
that LFV decays can give strigent costraints on the parameter space of the 4th
neutrino mass $m_{\nu'}$.
| [
{
"created": "Thu, 21 Mar 2002 17:10:52 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Mar 2002 09:27:49 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Huo",
"Wu-Jun",
"",
"IHEP, Cas, China"
],
[
"Feng",
"Tai-Fu",
"",
"IHEP, Cas, China"
]
] | We investigate the lepton flavor violation decays, $\tau \to \mu\gamma$, $\tau \to e\gamma$ and $\mu \to e\gamma$, in the framwork of a squential fourth generation model with a heavy fourth neutrino, $\nu'$. Using the recent experimental bounds, we can obtain the constraints of the $4\times 4$ leptonic mixing matrix element factors, $V_{1\nu'},V_{2\nu'}$ and $V_{3\nu'}$. We find that LFV decays can give strigent costraints on the parameter space of the 4th neutrino mass $m_{\nu'}$. |
1505.02006 | Stefano Forte | Claudio Muselli, Marco Bonvini, Stefano Forte, Simone Marzani and
Giovanni Ridolfi | Top Quark Pair Production beyond NNLO | 34 pages, 9 figures; final version, to be published in JHEP;
reference added, minor improvements | JHEP 08 (2015) 076 | 10.1007/JHEP08(2015)076 | TIF-UNIMI-2015-4, OUTP-15-09P, MIT-CTP 4656 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct an approximate expression for the total cross section for the
production of a heavy quark-antiquark pair in hadronic collisions at
next-to-next-to-next-to-leading order (N$^3$LO) in $\alpha_s$. We use a
technique which exploits the analyticity of the Mellin space cross section, and
the information on its singularity structure coming from large N (soft gluon,
Sudakov) and small N (high energy, BFKL) all order resummations, previously
introduced and used in the case of Higgs production. We validate our method by
comparing to available exact results up to NNLO. We find that N$^3$LO
corrections increase the predicted top pair cross section at the LHC by about
4% over the NNLO.
| [
{
"created": "Fri, 8 May 2015 11:55:49 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Sep 2015 10:36:45 GMT",
"version": "v2"
}
] | 2015-09-09 | [
[
"Muselli",
"Claudio",
""
],
[
"Bonvini",
"Marco",
""
],
[
"Forte",
"Stefano",
""
],
[
"Marzani",
"Simone",
""
],
[
"Ridolfi",
"Giovanni",
""
]
] | We construct an approximate expression for the total cross section for the production of a heavy quark-antiquark pair in hadronic collisions at next-to-next-to-next-to-leading order (N$^3$LO) in $\alpha_s$. We use a technique which exploits the analyticity of the Mellin space cross section, and the information on its singularity structure coming from large N (soft gluon, Sudakov) and small N (high energy, BFKL) all order resummations, previously introduced and used in the case of Higgs production. We validate our method by comparing to available exact results up to NNLO. We find that N$^3$LO corrections increase the predicted top pair cross section at the LHC by about 4% over the NNLO. |
2208.01256 | Jihn E. Kim | Jihn E. Kim | Quintessential Axions | 23 pages, 7 figures. arXiv admin note: text overlap with
arXiv:2102.01795 | null | null | null | hep-ph hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | I review the dark energy solutions by a very light pseudoscalar called
"quintessential axion". For the explicit breaking terms, we consider both the
global anomaly U(1)$_{\rm global}\times$SU(2)$_W^2$ and the potential $\Delta
V$. At the field theory level, we will present a strategy for picking up one
such pseudoscalar among plenty of pseudoscalars. At string level, numerous
antisymmetric tensor fields are pseudoscalars. Including these, we present a
confining force example via a $Z_{12-I}$ orbifold compactification of SO(32)
heterotic string. In addition, we also aim to draw attention on almost massless
mesons of confining nonabelian gauge group, which can be another motivation for
introducing an additional confining force, to explain dark energy as the vacuum
energy of these mesons.
| [
{
"created": "Tue, 2 Aug 2022 05:33:50 GMT",
"version": "v1"
}
] | 2022-08-03 | [
[
"Kim",
"Jihn E.",
""
]
] | I review the dark energy solutions by a very light pseudoscalar called "quintessential axion". For the explicit breaking terms, we consider both the global anomaly U(1)$_{\rm global}\times$SU(2)$_W^2$ and the potential $\Delta V$. At the field theory level, we will present a strategy for picking up one such pseudoscalar among plenty of pseudoscalars. At string level, numerous antisymmetric tensor fields are pseudoscalars. Including these, we present a confining force example via a $Z_{12-I}$ orbifold compactification of SO(32) heterotic string. In addition, we also aim to draw attention on almost massless mesons of confining nonabelian gauge group, which can be another motivation for introducing an additional confining force, to explain dark energy as the vacuum energy of these mesons. |
hep-ph/0003177 | Stefan Kretzer | S. Kretzer (Dortmund Univ.) | Fragmentation Functions from Flavour-inclusive and Flavour-tagged e^+e^-
Annihilations | 34 pages, 11 eps-figures, uses epsfig, amssymb, citesort, 1 reference
updated | Phys.Rev. D62 (2000) 054001 | 10.1103/PhysRevD.62.054001 | DO-TH 00/04 | hep-ph | null | Fitting $Z^0$-pole data from ALEPH and SLD, and TPC data at a lower c.m.s.\
energy, we fix the boundary condition for NLO parton$\to$hadron
(hadron$=\pi^\pm, K^\pm, \sum_h h^\pm$) fragmentation functions (FFs) at the
low resolution scale of the radiative parton model of Gl\"{u}ck, Reya and Vogt
(GRV). Perturbative LO$\leftrightarrow$NLO stability is investigated. The
emphasis of the fit is on information on the fragmentation process for
individual light ($u,d,s$) and heavy ($c,b$) quark flavours where we comment on
the factorization scheme for heavy quarks in $e^+e^-$ annihilations as compared
to deep inelastic production. Inasmuch as the light quark input parameters are
not yet completely pinned down by measurements we assume power laws to
implement a physical hierarchy among the FFs respecting valence enhancement and
strangeness suppression both of which are manifest from recent leading particle
measurements. Through the second Mellin moments of the input functions we
discuss the energy-momentum sum rule for massless FFs. We discuss our results
in comparison to previous fits and recent 3-jet measurements and formulate
present uncertainties in our knowledge of the individual FFs.
| [
{
"created": "Fri, 17 Mar 2000 14:02:55 GMT",
"version": "v1"
},
{
"created": "Wed, 10 May 2000 09:35:44 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Kretzer",
"S.",
"",
"Dortmund Univ."
]
] | Fitting $Z^0$-pole data from ALEPH and SLD, and TPC data at a lower c.m.s.\ energy, we fix the boundary condition for NLO parton$\to$hadron (hadron$=\pi^\pm, K^\pm, \sum_h h^\pm$) fragmentation functions (FFs) at the low resolution scale of the radiative parton model of Gl\"{u}ck, Reya and Vogt (GRV). Perturbative LO$\leftrightarrow$NLO stability is investigated. The emphasis of the fit is on information on the fragmentation process for individual light ($u,d,s$) and heavy ($c,b$) quark flavours where we comment on the factorization scheme for heavy quarks in $e^+e^-$ annihilations as compared to deep inelastic production. Inasmuch as the light quark input parameters are not yet completely pinned down by measurements we assume power laws to implement a physical hierarchy among the FFs respecting valence enhancement and strangeness suppression both of which are manifest from recent leading particle measurements. Through the second Mellin moments of the input functions we discuss the energy-momentum sum rule for massless FFs. We discuss our results in comparison to previous fits and recent 3-jet measurements and formulate present uncertainties in our knowledge of the individual FFs. |
hep-ph/9808280 | U. Meissner | Sven Steininger, Ulf-G. Mei{\ss}ner and Nadia Fettes | On wave function renormalization and related aspects in heavy fermion
effective field theories | 25 pp, JHEP.cls, uses epsf+epsfig, 2 figs, some corrections | JHEP 9809 (1998) 008 | 10.1088/1126-6708/1998/09/008 | FZJ-IKP(TH)-1998-21 | hep-ph | null | We reconsider the question of wave function renormalization in heavy fermion
effective field theories. In particular, we work out a simple and efficient
scheme to define the wave function renormalization with respect to the lowest
order heavy fermion propagator. The method presented is free of a set of
ambiguities which arise in heavy fermion effective field theories. In this
context, we discuss the approaches used in the literature so far. We also
calculate the fourth order pion mass contribution to the nucleon mass shift and
discuss the tree and loop contributions to the electric Sachs form factor of
the nucleon.
| [
{
"created": "Mon, 10 Aug 1998 16:35:12 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Aug 1998 08:07:26 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Steininger",
"Sven",
""
],
[
"Meißner",
"Ulf-G.",
""
],
[
"Fettes",
"Nadia",
""
]
] | We reconsider the question of wave function renormalization in heavy fermion effective field theories. In particular, we work out a simple and efficient scheme to define the wave function renormalization with respect to the lowest order heavy fermion propagator. The method presented is free of a set of ambiguities which arise in heavy fermion effective field theories. In this context, we discuss the approaches used in the literature so far. We also calculate the fourth order pion mass contribution to the nucleon mass shift and discuss the tree and loop contributions to the electric Sachs form factor of the nucleon. |
hep-ph/9701378 | Eric Myers | R. Akhoury and V.I. Zakharov | Renormalon Variety in Deep Inelastic Scattering | 21 pages, LaTeX, 2 figures | null | null | UM-TH-97-05 | hep-ph | null | We discuss the renormalon-based approach to power corrections in non-singlet
deep inelastic scattering structure functions and compare it with the general
operator product expansion. The renormalon technique and its variations relate
the power corrections directly to infrared-sensitive parameters such as the
position of the Landau pole \Lambda_{QCD} or the infinitesimal gluon mass
\lambda. In terms of the standard OPE these techniques unify evaluations of the
coefficient functions and of matrix elements. We argue that in case of deep
inelastic scattering there is a proliferation of competeing infrared sensitive
parameters. In particular we consider the gluon and quark masses, virtuality of
quarks and \Lambda_{QCD} as possible infrared cut offs and compare the emerging
results. In the standard renormalon technique where \Lambda_{QCD} is the
infrared parameter, the argument of the running coupling is crucial to obtain
the correct x dependance of the structure functions. Finally we discuss the
limitations of the use of the renormalon based methods for determining of the x
dependance of the power corrections.
| [
{
"created": "Fri, 24 Jan 1997 22:55:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Akhoury",
"R.",
""
],
[
"Zakharov",
"V. I.",
""
]
] | We discuss the renormalon-based approach to power corrections in non-singlet deep inelastic scattering structure functions and compare it with the general operator product expansion. The renormalon technique and its variations relate the power corrections directly to infrared-sensitive parameters such as the position of the Landau pole \Lambda_{QCD} or the infinitesimal gluon mass \lambda. In terms of the standard OPE these techniques unify evaluations of the coefficient functions and of matrix elements. We argue that in case of deep inelastic scattering there is a proliferation of competeing infrared sensitive parameters. In particular we consider the gluon and quark masses, virtuality of quarks and \Lambda_{QCD} as possible infrared cut offs and compare the emerging results. In the standard renormalon technique where \Lambda_{QCD} is the infrared parameter, the argument of the running coupling is crucial to obtain the correct x dependance of the structure functions. Finally we discuss the limitations of the use of the renormalon based methods for determining of the x dependance of the power corrections. |
hep-ph/0207156 | Nanava Giso | A.Andonov, D.Bardin, S.Bondarenko, P.Christova, L.Kalinovskaya, and
G.Nanava | Update of one-loop corrections for E+ E- --> F anti-F, first run of SANC
system | Updated version as appeared in the journal | Phys.Part.Nucl.34:577-618,2003; Fiz.Elem.Chast.Atom.Yadra
34:1125-1195,2003 | null | null | hep-ph | null | We present a description of calculations of the amplitude for E+ E- --> F
anti-F process with account of electroweak and QED one-loop corrections. This
study is performed within the framework of the project SANC. The calculations
are done within the OMS (on-mass-shell) renormalization scheme in two gauges:
in Rxi, which allows an explicit control of gauge invariance by examining
cancellation of gauge parameters and search for gauge-invariant subsets of
diagrams, and in the unitary gauge as a cross-check. The formulae we derived
are realized in two independent FORTRAN codes, eeffLib, which was written in an
old fashioned way, i.e. manually, and another one, created automatically with
an aid of s2n.f (symbols to numbers) software -- a part of SANC system. We
present a comprehensive comparison with the results of the well-known program
ZFITTER for all the light fermion production channels, as well as with the
results existing in the world literature for the process E+ E- --> F anti-F;
| [
{
"created": "Fri, 12 Jul 2002 14:00:36 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Feb 2003 15:14:23 GMT",
"version": "v2"
}
] | 2011-01-13 | [
[
"Andonov",
"A.",
""
],
[
"Bardin",
"D.",
""
],
[
"Bondarenko",
"S.",
""
],
[
"Christova",
"P.",
""
],
[
"Kalinovskaya",
"L.",
""
],
[
"Nanava",
"G.",
""
]
] | We present a description of calculations of the amplitude for E+ E- --> F anti-F process with account of electroweak and QED one-loop corrections. This study is performed within the framework of the project SANC. The calculations are done within the OMS (on-mass-shell) renormalization scheme in two gauges: in Rxi, which allows an explicit control of gauge invariance by examining cancellation of gauge parameters and search for gauge-invariant subsets of diagrams, and in the unitary gauge as a cross-check. The formulae we derived are realized in two independent FORTRAN codes, eeffLib, which was written in an old fashioned way, i.e. manually, and another one, created automatically with an aid of s2n.f (symbols to numbers) software -- a part of SANC system. We present a comprehensive comparison with the results of the well-known program ZFITTER for all the light fermion production channels, as well as with the results existing in the world literature for the process E+ E- --> F anti-F; |
0907.4511 | Timur Delahaye | Celine Boehm, Timur Delahaye, Pierre Salati, Florian Staub, Ritesh K.
Singh | Implication of the PAMELA antiproton data for dark matter indirect
detection at LHC | 7 pages, 2 figures, captions of some figures modified, main
conclusion unchanged | JCAP 1006:013,2010 | 10.1088/1475-7516/2010/06/013 | LAPTH/1343 | hep-ph astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Since the PAMELA results on the "anomalously" high positron fraction and the
lack of antiproton excess in our Galaxy, there has been a tremendous number of
studies advocating new types of dark matter, with larger couplings to electrons
than to quarks.
This raises the question of the production of dark matter particles (and
heavy associated coloured states) at LHC. Here, we explore a very simple
benchmark dark matter model and show that, in spite of the agreement between
the PAMELA antiproton measurements and the expected astrophysical secondary
background, there is room for large couplings of a WIMP candidate to heavy
quarks. Contrary to what could have been naively anticipated, the PAMELA pbar/p
measurements do not challenge dark matter model building, as far as the quark
sector is concerned. A quarkophillic species is therefore not forbidden.Owing
to these large couplings, one would expect that a new production channel opens
up at the LHC, through quark--quark and quark--gluon interactions. Alas, when
the PDF of the quark is taken into account, prospects for a copious production
fade away.
| [
{
"created": "Mon, 27 Jul 2009 17:28:57 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Oct 2009 19:46:03 GMT",
"version": "v2"
},
{
"created": "Sat, 6 Feb 2010 15:57:54 GMT",
"version": "v3"
},
{
"created": "Wed, 28 Apr 2010 07:31:28 GMT",
"version": "v4"
}
] | 2014-11-20 | [
[
"Boehm",
"Celine",
""
],
[
"Delahaye",
"Timur",
""
],
[
"Salati",
"Pierre",
""
],
[
"Staub",
"Florian",
""
],
[
"Singh",
"Ritesh K.",
""
]
] | Since the PAMELA results on the "anomalously" high positron fraction and the lack of antiproton excess in our Galaxy, there has been a tremendous number of studies advocating new types of dark matter, with larger couplings to electrons than to quarks. This raises the question of the production of dark matter particles (and heavy associated coloured states) at LHC. Here, we explore a very simple benchmark dark matter model and show that, in spite of the agreement between the PAMELA antiproton measurements and the expected astrophysical secondary background, there is room for large couplings of a WIMP candidate to heavy quarks. Contrary to what could have been naively anticipated, the PAMELA pbar/p measurements do not challenge dark matter model building, as far as the quark sector is concerned. A quarkophillic species is therefore not forbidden.Owing to these large couplings, one would expect that a new production channel opens up at the LHC, through quark--quark and quark--gluon interactions. Alas, when the PDF of the quark is taken into account, prospects for a copious production fade away. |
1110.3292 | Thomas A. Trainor | Thomas A. Trainor | Review of soft interactions and multiparticle correlations | 4 pages, 3 figures, to be published in the Proceedings of the XLI
International Symposium on Multiparticle Dynamics (ISMD 2011), 26-30
September, 2011, Miyajima Island, Hiroshima, Japan | null | 10.1143/PTPS.193.117 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent developments in the area of soft interactions and multiparticle
correlations are reviewed, including higher harmonic flows conjectured to
result from the initial-state geometry which might coincide with some jet-like
correlation features in more-central A-A collisions.
| [
{
"created": "Fri, 14 Oct 2011 18:35:11 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Trainor",
"Thomas A.",
""
]
] | Recent developments in the area of soft interactions and multiparticle correlations are reviewed, including higher harmonic flows conjectured to result from the initial-state geometry which might coincide with some jet-like correlation features in more-central A-A collisions. |
1009.1363 | Julien Baglio | Julien Baglio, Abdelhak Djouadi | Addendum to: Predictions for Higgs production at the Tevatron and the
associated uncertainties | 10 pages, 6 figures, 1 table. Addendum to
http://arxiv.org/abs/1003.4266 | JHEP 1010:064,2010 | 10.1007/JHEP10(2010)064 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent paper, we updated the theoretical predictions for the production
cross sections of the Standard Model Higgs boson at the Tevatron and estimated
the various uncertainties affecting these predictions. We found that there is a
large theoretical uncertainty, of order 40%, on the cross section for the main
production channel, gluon-gluon fusion into a Higgs boson. Since then, a note
from the Higgs working groups of the CDF and D0 collaborations criticizing our
modeling of the $gg\to H$ cross section has appeared. In this addendum, we
answer to this criticism point by point and, in particular, perform an analysis
of $\sigma(gg\to H)$ for a central value of the renormalization and
factorization scales $\mu_0=\frac12 M_H$ for which higher order corrections
beyond next-to-next-to-leading order (that we discarded in our previous
analysis) are implicitly included. Our results show that the new Tevatron
exclusion bound on the Higgs boson mass, $M_{H}!=!158$-175 GeV at the 95%
confidence level, is still largely debatable.
| [
{
"created": "Thu, 2 Sep 2010 12:51:40 GMT",
"version": "v1"
}
] | 2010-10-27 | [
[
"Baglio",
"Julien",
""
],
[
"Djouadi",
"Abdelhak",
""
]
] | In a recent paper, we updated the theoretical predictions for the production cross sections of the Standard Model Higgs boson at the Tevatron and estimated the various uncertainties affecting these predictions. We found that there is a large theoretical uncertainty, of order 40%, on the cross section for the main production channel, gluon-gluon fusion into a Higgs boson. Since then, a note from the Higgs working groups of the CDF and D0 collaborations criticizing our modeling of the $gg\to H$ cross section has appeared. In this addendum, we answer to this criticism point by point and, in particular, perform an analysis of $\sigma(gg\to H)$ for a central value of the renormalization and factorization scales $\mu_0=\frac12 M_H$ for which higher order corrections beyond next-to-next-to-leading order (that we discarded in our previous analysis) are implicitly included. Our results show that the new Tevatron exclusion bound on the Higgs boson mass, $M_{H}!=!158$-175 GeV at the 95% confidence level, is still largely debatable. |
1907.00983 | Alberto Salvio | Alberto Salvio | Quasi-Conformal Models and the Early Universe | 25 pages, 9 figures. Version published in EPJC | Eur.Phys.J. C79 (2019), 750 | 10.1140/epjc/s10052-019-7267-5 | null | hep-ph astro-ph.CO gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Extensions of the Standard Model and general relativity featuring a UV fixed
point can leave observable implications at accessible energies. Although mass
parameters such as the Planck scale can appear through dimensional
transmutation, all fundamental dimension-4 operators can (at least
approximately) respect Weyl invariance at finite energy. An example is the
Weyl-squared term, whose consistency and observational consequences are
studied. This quasi-conformal scenario emerges from the UV complete quadratic
gravity and is a possible framework for inflation. We find two realizations. In
the first one the inflaton is a fundamental scalar with a quasi-conformal
non-minimal coupling to the Ricci scalar. In this case the field excursion must
not exceed the Planck mass by far. An example discussed in detail is hilltop
inflation. In the second realization the inflaton is a pseudo-Goldstone boson
(natural inflation). In this case we show how to obtain an elegant UV
completion within an asymptotically free QCD-like theory, in which the inflaton
is a composite scalar due to new strong dynamics. We also show how efficient
reheating can occur. Unlike the natural inflation based on Einstein gravity,
the tensor-to-scalar ratio is well below the current bound set by Planck. In
both realizations mentioned above, the basic inflationary formulae are computed
analytically and, therefore, these possibilities can be used as simple
benchmark models.
| [
{
"created": "Mon, 1 Jul 2019 18:00:02 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Sep 2019 06:09:56 GMT",
"version": "v2"
}
] | 2019-09-13 | [
[
"Salvio",
"Alberto",
""
]
] | Extensions of the Standard Model and general relativity featuring a UV fixed point can leave observable implications at accessible energies. Although mass parameters such as the Planck scale can appear through dimensional transmutation, all fundamental dimension-4 operators can (at least approximately) respect Weyl invariance at finite energy. An example is the Weyl-squared term, whose consistency and observational consequences are studied. This quasi-conformal scenario emerges from the UV complete quadratic gravity and is a possible framework for inflation. We find two realizations. In the first one the inflaton is a fundamental scalar with a quasi-conformal non-minimal coupling to the Ricci scalar. In this case the field excursion must not exceed the Planck mass by far. An example discussed in detail is hilltop inflation. In the second realization the inflaton is a pseudo-Goldstone boson (natural inflation). In this case we show how to obtain an elegant UV completion within an asymptotically free QCD-like theory, in which the inflaton is a composite scalar due to new strong dynamics. We also show how efficient reheating can occur. Unlike the natural inflation based on Einstein gravity, the tensor-to-scalar ratio is well below the current bound set by Planck. In both realizations mentioned above, the basic inflationary formulae are computed analytically and, therefore, these possibilities can be used as simple benchmark models. |
0903.4188 | Carl E. Carlson | Andrei Afanasev (Hampton and JLab), Stanley J. Brodsky (SLAC), Carl E.
Carlson (William & Mary), Asmita Mukherjee (IIT, Mumbai) | Timelike Virtual Compton Scattering from Electron-Positron Radiative
Annihilation | 9 pages, 8 figures; v2 has improved kinematic discussion | Phys.Rev.D81:034014,2010 | 10.1103/PhysRevD.81.034014 | SLAC-PUB-13513 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose measurements of the deeply virtual Compton amplitude (DVCS),
gamma* to H H-bar gamma, in the timelike t = (p_{H} + p_{H-bar})^2 > 0
kinematic domain which is accessible at electron-positron colliders via the
radiative annihilation process e+ e- to H H-bar gamma. These processes allow
the measurement of timelike deeply virtual Compton scattering for a variety of
H H-bar hadron pairs such as pi+ pi-, K+ K-, and D D-bar as well as p p-bar. As
in the conventional spacelike DVCS, there are interfering coherent amplitudes
contributing to the timelike processes involving C= - form factors. The
interference between the amplitudes measures the phase of the C=+ timelike DVCS
amplitude relative to the phase of the timelike form factors and can be
isolated by considering the forward-backward e+ \leftrightarrow e- asymmetry.
The J=0 fixed pole contribution which arises from the local coupling of the two
photons to the quark current plays a special role. As an example we present a
simple model.
| [
{
"created": "Tue, 24 Mar 2009 20:52:14 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jul 2009 14:43:43 GMT",
"version": "v2"
}
] | 2010-03-04 | [
[
"Afanasev",
"Andrei",
"",
"Hampton and JLab"
],
[
"Brodsky",
"Stanley J.",
"",
"SLAC"
],
[
"Carlson",
"Carl E.",
"",
"William & Mary"
],
[
"Mukherjee",
"Asmita",
"",
"IIT, Mumbai"
]
] | We propose measurements of the deeply virtual Compton amplitude (DVCS), gamma* to H H-bar gamma, in the timelike t = (p_{H} + p_{H-bar})^2 > 0 kinematic domain which is accessible at electron-positron colliders via the radiative annihilation process e+ e- to H H-bar gamma. These processes allow the measurement of timelike deeply virtual Compton scattering for a variety of H H-bar hadron pairs such as pi+ pi-, K+ K-, and D D-bar as well as p p-bar. As in the conventional spacelike DVCS, there are interfering coherent amplitudes contributing to the timelike processes involving C= - form factors. The interference between the amplitudes measures the phase of the C=+ timelike DVCS amplitude relative to the phase of the timelike form factors and can be isolated by considering the forward-backward e+ \leftrightarrow e- asymmetry. The J=0 fixed pole contribution which arises from the local coupling of the two photons to the quark current plays a special role. As an example we present a simple model. |
hep-ph/0411377 | Zbigniew Was | Z. Was, P. Golonka | TAUOLA as tau Monte Carlo for future applications | 7 pages, 2 figure, Presented at International workshop on Tau Lepton
Physics, TAU04 Nara, Japan September 14-17,2004 | null | 10.1016/j.nuclphysbps.2005.02.012 | CERN-PH-TH/2004-230 HNINP-V-04-05 | hep-ph | null | The status of the Monte Carlo programs for the simulation of tau-lepton
production and decay in high-energy accelerator experiments is reviewed. In
particular, the status of the following packages is discussed: (i) TAUOLA for
tau-lepton decay, (ii) PHOTOS for radiative corrections in decays, (iii)
MC-TESTER packages for various types of semi-automatic tests, and (iv)
universal interface of TAUOLA for the decay of tau leptons produced by `any'
generator. Emphasis is put on recent developments for high-precision tests and
extensions of PHOTOS. Some considerations for the software organization
necessary in future applications for Belle and BaBar will be given; examples of
TAUOLA universal interface use will only be listed at the end of the review.
| [
{
"created": "Mon, 29 Nov 2004 20:53:20 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Was",
"Z.",
""
],
[
"Golonka",
"P.",
""
]
] | The status of the Monte Carlo programs for the simulation of tau-lepton production and decay in high-energy accelerator experiments is reviewed. In particular, the status of the following packages is discussed: (i) TAUOLA for tau-lepton decay, (ii) PHOTOS for radiative corrections in decays, (iii) MC-TESTER packages for various types of semi-automatic tests, and (iv) universal interface of TAUOLA for the decay of tau leptons produced by `any' generator. Emphasis is put on recent developments for high-precision tests and extensions of PHOTOS. Some considerations for the software organization necessary in future applications for Belle and BaBar will be given; examples of TAUOLA universal interface use will only be listed at the end of the review. |
2111.01994 | Ze-Fang Jiang | Ze-Fang Jiang, C. B. Yang and Qi Peng | Directed flow of charged particles within idealized viscous
hydrodynamics at energies available at the BNL Relativistic Heavy Ion
Collider and at the CERN Large Hadron Collider | 11 pages, 9 figures and 3 tables; any comments and feedback are
welcome. To appear as a Regular Article in Physical Review C | null | 10.1103/PhysRevC.104.064903 | null | hep-ph nucl-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | Following the Boz$\dot{\textrm{e}}$k-Wyskiel parametrization tilted initial
condition, an alternative way to construct a longitudinal tilted fireball based
on the Glauber collision geometry is presented. This longitudinal tilted
initial condition combined with the Ideal-CLVisc (3 + 1)D hydrodynamic model, a
nonvanishing directed flow coefficient $v_{1}$ in a wide rapidity range is
observed. After comparing the model's results with experimentally observed data
of directed flow coefficient $v_{1}(\eta)$ from $\sqrt{s_{NN}}$ = 200 GeV Cu +
Cu, Au + Au collisions at RHIC energy to $\sqrt{s_{NN}}$ = 2.76 TeV and
$\sqrt{s_{NN}}$ = 5.02 TeV Pb + Pb collisions at the LHC energy. We find that
the directed flow measurements in heavy-ion collisions can set strong
constraints on the imbalance of forward and backward incoming nuclei and on the
magnitude asymmetry of pressure gradients along the $x$ direction.
| [
{
"created": "Wed, 3 Nov 2021 03:20:42 GMT",
"version": "v1"
}
] | 2021-12-22 | [
[
"Jiang",
"Ze-Fang",
""
],
[
"Yang",
"C. B.",
""
],
[
"Peng",
"Qi",
""
]
] | Following the Boz$\dot{\textrm{e}}$k-Wyskiel parametrization tilted initial condition, an alternative way to construct a longitudinal tilted fireball based on the Glauber collision geometry is presented. This longitudinal tilted initial condition combined with the Ideal-CLVisc (3 + 1)D hydrodynamic model, a nonvanishing directed flow coefficient $v_{1}$ in a wide rapidity range is observed. After comparing the model's results with experimentally observed data of directed flow coefficient $v_{1}(\eta)$ from $\sqrt{s_{NN}}$ = 200 GeV Cu + Cu, Au + Au collisions at RHIC energy to $\sqrt{s_{NN}}$ = 2.76 TeV and $\sqrt{s_{NN}}$ = 5.02 TeV Pb + Pb collisions at the LHC energy. We find that the directed flow measurements in heavy-ion collisions can set strong constraints on the imbalance of forward and backward incoming nuclei and on the magnitude asymmetry of pressure gradients along the $x$ direction. |
hep-ph/0310275 | Yury Bystritsky | E.A. Kuraev, Yu.M. Bystritsky, E.P. Velicheva | Radiative corrections to radiative \pi e 2 decay | 21 pages, 3 figures, 3 tables; a table with K-factor values was added | Phys.Rev. D69 (2004) 114004 | 10.1103/PhysRevD.69.114004 | null | hep-ph | null | The lowest order radiative corrections (RC) to width and spectra of radiative
$\pi e2$ decay are calculated. We take into account virtual photon emission
contribution as well as soft and hard real photon emission one. The result
turns out to be consistent with the standard Drell-Yan picture for the width
and spectra in the leading logarithmical approximation which permits us to
generalize it to all orders of perturbation theory. Explicit expressions of
nonleading contributions are obtained. The contribution of short distance is
found to be in agreement with Standard Model predictions. It is presented as a
general normalization factor. We check the validity of the
Kinoshita-Lee-Nauenberg theorem about cancellation in the total width of the
mass singularities at zero limit of electron mass. We discuss the results of
the previous papers devoted to this problem. The Dalitz plot distribution is
illustrated numerically.
| [
{
"created": "Thu, 23 Oct 2003 15:14:59 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Oct 2003 19:29:54 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Mar 2004 09:33:40 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Kuraev",
"E. A.",
""
],
[
"Bystritsky",
"Yu. M.",
""
],
[
"Velicheva",
"E. P.",
""
]
] | The lowest order radiative corrections (RC) to width and spectra of radiative $\pi e2$ decay are calculated. We take into account virtual photon emission contribution as well as soft and hard real photon emission one. The result turns out to be consistent with the standard Drell-Yan picture for the width and spectra in the leading logarithmical approximation which permits us to generalize it to all orders of perturbation theory. Explicit expressions of nonleading contributions are obtained. The contribution of short distance is found to be in agreement with Standard Model predictions. It is presented as a general normalization factor. We check the validity of the Kinoshita-Lee-Nauenberg theorem about cancellation in the total width of the mass singularities at zero limit of electron mass. We discuss the results of the previous papers devoted to this problem. The Dalitz plot distribution is illustrated numerically. |
hep-ph/0602179 | Bernd Kniehl | B.A. Kniehl, D.V. Vasin, V.A. Saleev | Charmonium Production at High Energy in the k_T-Factorization Approach | 40 pages, 10 figures | Phys.Rev.D73:074022,2006 | 10.1103/PhysRevD.73.074022 | DESY 06-019 | hep-ph | null | We study charmonium production at high-energy colliders (Tevatron, HERA, and
LEP2) in the framework of the k_T-factorization approach and the factorization
formalism of non-relativistic quantum chromodynamics at leading order in the
strong-coupling constant alpha_s and the relative velocity v. The
transverse-momentum distributions of direct and prompt J/psi-meson production
measured at the Fermilab Tevatron are fitted to obtain the non-perturbative
long-distance matrix elements for different choices of unintegrated gluon
distribution functions in the proton. Using the matrix elements thus obtained,
we predict charmonium production rates in gamma-gamma, gamma-p, and
deep-inelastic e-p collisions including the contributions from both direct and
resolved photons. The results are compared with the known ones obtained in the
conventional parton model and with recent experimental data from HERA and LEP2.
| [
{
"created": "Mon, 20 Feb 2006 11:02:11 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kniehl",
"B. A.",
""
],
[
"Vasin",
"D. V.",
""
],
[
"Saleev",
"V. A.",
""
]
] | We study charmonium production at high-energy colliders (Tevatron, HERA, and LEP2) in the framework of the k_T-factorization approach and the factorization formalism of non-relativistic quantum chromodynamics at leading order in the strong-coupling constant alpha_s and the relative velocity v. The transverse-momentum distributions of direct and prompt J/psi-meson production measured at the Fermilab Tevatron are fitted to obtain the non-perturbative long-distance matrix elements for different choices of unintegrated gluon distribution functions in the proton. Using the matrix elements thus obtained, we predict charmonium production rates in gamma-gamma, gamma-p, and deep-inelastic e-p collisions including the contributions from both direct and resolved photons. The results are compared with the known ones obtained in the conventional parton model and with recent experimental data from HERA and LEP2. |
1211.2639 | Nicolas Bernal Dr. | Nicolas Bernal, Celine Boehm, Sergio Palomares-Ruiz, Joseph Silk,
Takashi Toma | Observing Higgs boson production through its decay into gamma-rays: A
messenger for Dark Matter candidates | 8 pages, 5 figures. V2: Final version published in PLB | Physics Letters B723(2013)100-106 | 10.1016/j.physletb.2013.04.047 | Bonn-TH-2012-030; IPPP/12/85; DCPT/12/72; CFTP/12-017 | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this Letter, we study the gamma-ray signatures subsequent to the
production of a Higgs boson in space by dark matter annihilations. We
investigate the cases where the Higgs boson is produced at rest or slightly
boosted and show that such configurations can produce characteristic bumps in
the gamma-ray data. These results are relevant in the case of the Standard
Model-like Higgs boson provided that the dark matter mass is about 63 GeV, 109
GeV or 126 GeV, but can be generalised to any other Higgs boson masses. Here,
we point out that it may be worth looking for a 63 GeV line since it could be
the signature of the decay of a Standard Model-like Higgs boson produced in
space, as in the case of a di-Higgs final state if m_DM ~ 126 GeV. We show that
one can set generic constraints on the Higgs boson production rates using its
decay properties. In particular, using the Fermi-LAT data from the galactic
center, we find that the dark matter annihilation cross section into gamma + a
Standard Model-like Higgs boson produced at rest or near rest cannot exceed
<sigma v> ~ a few 10^-25 cm^3/s or <sigma v> ~ a few 10^-27 cm^3/s
respectively, providing us with information on the Higgs coupling to the dark
matter particle. We conclude that Higgs bosons can indeed be used as messengers
to explore the dark matter mass range.
| [
{
"created": "Mon, 12 Nov 2012 14:39:09 GMT",
"version": "v1"
},
{
"created": "Fri, 24 May 2013 10:13:07 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Bernal",
"Nicolas",
""
],
[
"Boehm",
"Celine",
""
],
[
"Palomares-Ruiz",
"Sergio",
""
],
[
"Silk",
"Joseph",
""
],
[
"Toma",
"Takashi",
""
]
] | In this Letter, we study the gamma-ray signatures subsequent to the production of a Higgs boson in space by dark matter annihilations. We investigate the cases where the Higgs boson is produced at rest or slightly boosted and show that such configurations can produce characteristic bumps in the gamma-ray data. These results are relevant in the case of the Standard Model-like Higgs boson provided that the dark matter mass is about 63 GeV, 109 GeV or 126 GeV, but can be generalised to any other Higgs boson masses. Here, we point out that it may be worth looking for a 63 GeV line since it could be the signature of the decay of a Standard Model-like Higgs boson produced in space, as in the case of a di-Higgs final state if m_DM ~ 126 GeV. We show that one can set generic constraints on the Higgs boson production rates using its decay properties. In particular, using the Fermi-LAT data from the galactic center, we find that the dark matter annihilation cross section into gamma + a Standard Model-like Higgs boson produced at rest or near rest cannot exceed <sigma v> ~ a few 10^-25 cm^3/s or <sigma v> ~ a few 10^-27 cm^3/s respectively, providing us with information on the Higgs coupling to the dark matter particle. We conclude that Higgs bosons can indeed be used as messengers to explore the dark matter mass range. |
hep-ph/0701069 | Valentin V. Khoze | Steven A. Abel and Valentin V. Khoze | Metastable SUSY breaking within the Standard Model | 20 pages | null | null | IPPP/07/01 | hep-ph hep-th | null | We construct a supersymmetric version of the Standard Model which contains a
long-lived metastable vacuum. In this vacuum supersymmetry is broken and the
electroweak symmetry is Higgsed, and we identify it with the physical ground
state of the Standard Model. In our approach the metastable supersymmetry
breaking (MSB) occurs directly in the SU(2)_L x U(1)_Y sector of the Standard
Model; it does not require a separate MSB sector and in this way it departs
from the usual lore. There is a direct link between the electroweak symmetry
breaking and the supersymmetry breaking in our model, both effects are induced
by the same Higgs fields. In order to generate sufficiently large gluino masses
we have to have strong coupling in the Higgs sector, h >> 1. Our model results
in an extremely compact low-energy effective theory at the electroweak scale
with Higgs fields being very heavy, M_{Higgs} >> M_W and frozen at their vacuum
expectation values.
| [
{
"created": "Tue, 9 Jan 2007 20:01:36 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jan 2007 14:24:59 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Jan 2007 14:24:30 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Abel",
"Steven A.",
""
],
[
"Khoze",
"Valentin V.",
""
]
] | We construct a supersymmetric version of the Standard Model which contains a long-lived metastable vacuum. In this vacuum supersymmetry is broken and the electroweak symmetry is Higgsed, and we identify it with the physical ground state of the Standard Model. In our approach the metastable supersymmetry breaking (MSB) occurs directly in the SU(2)_L x U(1)_Y sector of the Standard Model; it does not require a separate MSB sector and in this way it departs from the usual lore. There is a direct link between the electroweak symmetry breaking and the supersymmetry breaking in our model, both effects are induced by the same Higgs fields. In order to generate sufficiently large gluino masses we have to have strong coupling in the Higgs sector, h >> 1. Our model results in an extremely compact low-energy effective theory at the electroweak scale with Higgs fields being very heavy, M_{Higgs} >> M_W and frozen at their vacuum expectation values. |
2212.12188 | Yasuki Tachibana | Y. Tachibana, A. Angerami, R. Arora, S. A. Bass, S. Cao, Y. Chen, T.
Dai, L. Du, R. Ehlers, H. Elfner, W. Fan, R. J. Fries, C. Gale, Y. He, M.
Heffernan, U. Heinz, B. V. Jacak, P. M. Jacobs, S. Jeon, Y. Ji, L. Kasper, W.
Ke, M. Kelsey, M. Kordell II, A. Kumar, J. Latessa, Y.-J. Lee, D. Liyanage,
A. Lopez, M. Luzum, S. Mak, A. Majumder, A. Mankolli, C. Martin, H. Mehryar,
T. Mengel, J. Mulligan, C. Nattrass, D. Oliinychenko, J.-F. Paquet, J. H.
Putschke, G. Roland, B. Schenke, L. Schwiebert, A. Sengupta, C. Shen, A.
Silva, C. Sirimanna, D. Soeder, R. A. Soltz, I. Soudi, J. Staudenmaier, M.
Strickland, J. Velkovska, G. Vujanovic, X.-N. Wang, R. L. Wolpert, W. Zhao
(the JETSCAPE Collaboration) | Comprehensive Study of Multi-scale Jet-medium Interaction | 6 pages, 5 figures, contribution to the Quark Matter 2022 proceedings | Acta Phys. Pol. B Proc. Suppl. 16, 1-A50 (2023) | 10.5506/APhysPolBSupp.16.1-A50 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | We explore jet-medium interactions at various scales in high-energy heavy-ion
collisions using the JETSCAPE framework. The physics of the multi-stage
modeling and the coherence effect at high virtuality is discussed through the
results of multiple jet and high-$p_{\mathrm{T}}$ particle observables,
compared with experimental data. Furthermore, we investigate the jet-medium
interaction involved in the hadronization process.
| [
{
"created": "Fri, 23 Dec 2022 08:01:16 GMT",
"version": "v1"
}
] | 2024-01-05 | [
[
"Tachibana",
"Y.",
"",
"the JETSCAPE Collaboration"
],
[
"Angerami",
"A.",
"",
"the JETSCAPE Collaboration"
],
[
"Arora",
"R.",
"",
"the JETSCAPE Collaboration"
],
[
"Bass",
"S. A.",
"",
"the JETSCAPE Collaboration"
],
[
"Cao",
"S.",
"",
"the JETSCAPE Collaboration"
],
[
"Chen",
"Y.",
"",
"the JETSCAPE Collaboration"
],
[
"Dai",
"T.",
"",
"the JETSCAPE Collaboration"
],
[
"Du",
"L.",
"",
"the JETSCAPE Collaboration"
],
[
"Ehlers",
"R.",
"",
"the JETSCAPE Collaboration"
],
[
"Elfner",
"H.",
"",
"the JETSCAPE Collaboration"
],
[
"Fan",
"W.",
"",
"the JETSCAPE Collaboration"
],
[
"Fries",
"R. J.",
"",
"the JETSCAPE Collaboration"
],
[
"Gale",
"C.",
"",
"the JETSCAPE Collaboration"
],
[
"He",
"Y.",
"",
"the JETSCAPE Collaboration"
],
[
"Heffernan",
"M.",
"",
"the JETSCAPE Collaboration"
],
[
"Heinz",
"U.",
"",
"the JETSCAPE Collaboration"
],
[
"Jacak",
"B. V.",
"",
"the JETSCAPE Collaboration"
],
[
"Jacobs",
"P. M.",
"",
"the JETSCAPE Collaboration"
],
[
"Jeon",
"S.",
"",
"the JETSCAPE Collaboration"
],
[
"Ji",
"Y.",
"",
"the JETSCAPE Collaboration"
],
[
"Kasper",
"L.",
"",
"the JETSCAPE Collaboration"
],
[
"Ke",
"W.",
"",
"the JETSCAPE Collaboration"
],
[
"Kelsey",
"M.",
"",
"the JETSCAPE Collaboration"
],
[
"Kordell",
"M.",
"II",
"the JETSCAPE Collaboration"
],
[
"Kumar",
"A.",
"",
"the JETSCAPE Collaboration"
],
[
"Latessa",
"J.",
"",
"the JETSCAPE Collaboration"
],
[
"Lee",
"Y. -J.",
"",
"the JETSCAPE Collaboration"
],
[
"Liyanage",
"D.",
"",
"the JETSCAPE Collaboration"
],
[
"Lopez",
"A.",
"",
"the JETSCAPE Collaboration"
],
[
"Luzum",
"M.",
"",
"the JETSCAPE Collaboration"
],
[
"Mak",
"S.",
"",
"the JETSCAPE Collaboration"
],
[
"Majumder",
"A.",
"",
"the JETSCAPE Collaboration"
],
[
"Mankolli",
"A.",
"",
"the JETSCAPE Collaboration"
],
[
"Martin",
"C.",
"",
"the JETSCAPE Collaboration"
],
[
"Mehryar",
"H.",
"",
"the JETSCAPE Collaboration"
],
[
"Mengel",
"T.",
"",
"the JETSCAPE Collaboration"
],
[
"Mulligan",
"J.",
"",
"the JETSCAPE Collaboration"
],
[
"Nattrass",
"C.",
"",
"the JETSCAPE Collaboration"
],
[
"Oliinychenko",
"D.",
"",
"the JETSCAPE Collaboration"
],
[
"Paquet",
"J. -F.",
"",
"the JETSCAPE Collaboration"
],
[
"Putschke",
"J. H.",
"",
"the JETSCAPE Collaboration"
],
[
"Roland",
"G.",
"",
"the JETSCAPE Collaboration"
],
[
"Schenke",
"B.",
"",
"the JETSCAPE Collaboration"
],
[
"Schwiebert",
"L.",
"",
"the JETSCAPE Collaboration"
],
[
"Sengupta",
"A.",
"",
"the JETSCAPE Collaboration"
],
[
"Shen",
"C.",
"",
"the JETSCAPE Collaboration"
],
[
"Silva",
"A.",
"",
"the JETSCAPE Collaboration"
],
[
"Sirimanna",
"C.",
"",
"the JETSCAPE Collaboration"
],
[
"Soeder",
"D.",
"",
"the JETSCAPE Collaboration"
],
[
"Soltz",
"R. A.",
"",
"the JETSCAPE Collaboration"
],
[
"Soudi",
"I.",
"",
"the JETSCAPE Collaboration"
],
[
"Staudenmaier",
"J.",
"",
"the JETSCAPE Collaboration"
],
[
"Strickland",
"M.",
"",
"the JETSCAPE Collaboration"
],
[
"Velkovska",
"J.",
"",
"the JETSCAPE Collaboration"
],
[
"Vujanovic",
"G.",
"",
"the JETSCAPE Collaboration"
],
[
"Wang",
"X. -N.",
"",
"the JETSCAPE Collaboration"
],
[
"Wolpert",
"R. L.",
"",
"the JETSCAPE Collaboration"
],
[
"Zhao",
"W.",
"",
"the JETSCAPE Collaboration"
]
] | We explore jet-medium interactions at various scales in high-energy heavy-ion collisions using the JETSCAPE framework. The physics of the multi-stage modeling and the coherence effect at high virtuality is discussed through the results of multiple jet and high-$p_{\mathrm{T}}$ particle observables, compared with experimental data. Furthermore, we investigate the jet-medium interaction involved in the hadronization process. |
0706.1880 | Elena G. Ferreiro | A. Capella and E. G. Ferreiro | Multiplicities and $J/\psi$ suppression at LHC energies | 2 pages, 2 figures. Contributed to Workshop on Heavy Ion Collisions
at the LHC: Last Call for Predictions, Geneva, Switzerland, 14 May - 8 Jun
2007 | null | null | null | hep-ph | null | We present our predictions on multiplicities and $J/\psi$ suppression at LHC
energies. Our results take into account shadowing effects in the initial state
and final state interactions with the hot medium. We obtain 1800 charged
particles at LHC and the $J/\psi$ suppression increases by a factor 5 to 6
compared to RHIC.
| [
{
"created": "Wed, 13 Jun 2007 12:01:06 GMT",
"version": "v1"
}
] | 2007-06-14 | [
[
"Capella",
"A.",
""
],
[
"Ferreiro",
"E. G.",
""
]
] | We present our predictions on multiplicities and $J/\psi$ suppression at LHC energies. Our results take into account shadowing effects in the initial state and final state interactions with the hot medium. We obtain 1800 charged particles at LHC and the $J/\psi$ suppression increases by a factor 5 to 6 compared to RHIC. |
1409.3133 | Li-Sheng Geng | Jun-Xu Lu, Yu Zhou, Hua-Xing Chen, Ju-Jun Xie, and Li-Sheng Geng | Dynamically generated $J^P=1/2^-(3/2^-)$ singly charmed and bottom heavy
baryons | 35 pages, 2 figures; extended to 3/2^- sector and the effects of NLO
potentials estimated; to appear in Physical Review D | Phys. Rev. D 92, 014036 (2015) | 10.1103/PhysRevD.92.014036 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Approximate heavy-quark spin and flavor symmetry and chiral symmetry play an
important role in our understanding of the nonperturbative regime of strong
interactions. In this work, utilizing the unitarized chiral perturbation
theory, we explore the consequences of these symmetries in the description of
the interactions between the ground-state singly charmed (bottom) baryons and
the pseudo-Nambu-Goldstone bosons. In particular, at leading order in the
chiral expansion, by fixing the only parameter in the theory to reproduce the
$\Lambda_b(5912)$ [$\Lambda_b^*(5920)$] or the $\Lambda_c(2595)$
[$\Lambda_c^*(2625)$], we predict a number of dynamically generated states,
which are contrasted with those of other approaches and available experimental
data. In anticipation of future lattice QCD simulations, we calculate the
corresponding scattering lengths and compare them to the existing predictions
from a $\mathcal{O}(p^3)$ chiral perturbation theory study. In addition, we
estimate the effects of the next-to-leading-order potentials by adopting
heavy-meson Lagrangians and fixing the relevant low-energy constants using
either symmetry or naturalness arguments. It is shown that higher-order
potentials play a relatively important role in many channels, indicating that
further studies are needed once more experimental or lattice QCD data become
available.
| [
{
"created": "Wed, 10 Sep 2014 16:07:32 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Jul 2015 14:10:13 GMT",
"version": "v2"
}
] | 2015-08-05 | [
[
"Lu",
"Jun-Xu",
""
],
[
"Zhou",
"Yu",
""
],
[
"Chen",
"Hua-Xing",
""
],
[
"Xie",
"Ju-Jun",
""
],
[
"Geng",
"Li-Sheng",
""
]
] | Approximate heavy-quark spin and flavor symmetry and chiral symmetry play an important role in our understanding of the nonperturbative regime of strong interactions. In this work, utilizing the unitarized chiral perturbation theory, we explore the consequences of these symmetries in the description of the interactions between the ground-state singly charmed (bottom) baryons and the pseudo-Nambu-Goldstone bosons. In particular, at leading order in the chiral expansion, by fixing the only parameter in the theory to reproduce the $\Lambda_b(5912)$ [$\Lambda_b^*(5920)$] or the $\Lambda_c(2595)$ [$\Lambda_c^*(2625)$], we predict a number of dynamically generated states, which are contrasted with those of other approaches and available experimental data. In anticipation of future lattice QCD simulations, we calculate the corresponding scattering lengths and compare them to the existing predictions from a $\mathcal{O}(p^3)$ chiral perturbation theory study. In addition, we estimate the effects of the next-to-leading-order potentials by adopting heavy-meson Lagrangians and fixing the relevant low-energy constants using either symmetry or naturalness arguments. It is shown that higher-order potentials play a relatively important role in many channels, indicating that further studies are needed once more experimental or lattice QCD data become available. |
1906.01884 | A. Cooper-Sarkar | Amanda Cooper-Sarkar (H1 and ZEUS Collaborations) | HERAPDF2.0Jets NNLO (prel.), the completion of the HERAPDF2.0 family | 6 pages, 3 figures, Proceedings of DIS2019 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The HERAPDF2.0 family, introduced in 2015, is completed with fits
HERAPDF2.0Jets NNLO (prel.) based on inclusive HERA data and selected jet
production data. The result of a fit with the strong coupling constant,
$\alpha_s(M^2_Z)$, free is $\alpha_s(M^2_Z) = 0.1150 \pm 0.0008{\rm (exp)}
^{+0.0002}_{-0.0005}$ (model/parameterisation) $\pm 0.0006{\rm (hadronisation)}
\pm 0.0027 {\rm (scale)}$. Sets of parton density functions, PDFs, from fits
with fixed $\alpha_s(M^2_Z) = 0.115$ and $\alpha_s(M^2_Z) = 0.118$ are
presented and compared.
| [
{
"created": "Wed, 5 Jun 2019 08:52:35 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Jun 2019 10:00:31 GMT",
"version": "v2"
}
] | 2019-06-07 | [
[
"Cooper-Sarkar",
"Amanda",
"",
"H1 and ZEUS Collaborations"
]
] | The HERAPDF2.0 family, introduced in 2015, is completed with fits HERAPDF2.0Jets NNLO (prel.) based on inclusive HERA data and selected jet production data. The result of a fit with the strong coupling constant, $\alpha_s(M^2_Z)$, free is $\alpha_s(M^2_Z) = 0.1150 \pm 0.0008{\rm (exp)} ^{+0.0002}_{-0.0005}$ (model/parameterisation) $\pm 0.0006{\rm (hadronisation)} \pm 0.0027 {\rm (scale)}$. Sets of parton density functions, PDFs, from fits with fixed $\alpha_s(M^2_Z) = 0.115$ and $\alpha_s(M^2_Z) = 0.118$ are presented and compared. |
0807.5103 | Neelima Kelkar Dr | M. Nowakowski, N. G. Kelkar | Long Tail of Quantum Decay from Scattering Data | Talk given by M. Nowakowski at SCADRON70: Workshop on Scalar Mesons
and Related Topics, Lisbon, Portugal | AIPConf.Proc.1030:250-255,2008 | 10.1063/1.2973508 | null | hep-ph nucl-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Whereas the short time behaviour of an unstable quantum mechanical system is
well understood from its theoretical as well as experimental side, the long
time tail of the very same systems has neither been measured experimentally nor
is there a theoretical agreement on how to handle it. We suggest a possible way
out of this unsatisfactory state of art. Theoretically we suggest that the
correct spectral function entering the Fock-Krylov method to calculate the
survival amplitude is proportional to the density of states of a resonance. The
latter is essentially the energy derivative of a phase shift. As a bonus, we
can connect the survival probability to scattering data via the phase shift.
The method then not only establishes the spectral function, but is per se a
semi-empirical method to extract the large time behaviour from scattering data.
| [
{
"created": "Thu, 31 Jul 2008 16:41:15 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Nowakowski",
"M.",
""
],
[
"Kelkar",
"N. G.",
""
]
] | Whereas the short time behaviour of an unstable quantum mechanical system is well understood from its theoretical as well as experimental side, the long time tail of the very same systems has neither been measured experimentally nor is there a theoretical agreement on how to handle it. We suggest a possible way out of this unsatisfactory state of art. Theoretically we suggest that the correct spectral function entering the Fock-Krylov method to calculate the survival amplitude is proportional to the density of states of a resonance. The latter is essentially the energy derivative of a phase shift. As a bonus, we can connect the survival probability to scattering data via the phase shift. The method then not only establishes the spectral function, but is per se a semi-empirical method to extract the large time behaviour from scattering data. |
2004.11031 | Chun-Khiang Chua | Chun-Khiang Chua | Data-driven study of the implications of anomalous magnetic moments and
lepton flavor violating processes of $e$, $\mu$ and $\tau$ | To appear in Phys. Rev. D; 43 pages, 12 figures | Phys. Rev. D 102, 055022 (2020) | 10.1103/PhysRevD.102.055022 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study anomalous magnetic moments and flavor violating processes of $e$,
$\mu$ and $\tau$ leptons. We use a data driven approach to investigate the
implications of the present data on the parameters of a class of models, which
has spin-0 scalar and spin-1/2 fermion fields. We compare two different cases,
which has or does not have a built-in cancelation mechanism. Our findings are
as following. Chiral interactions are unable to generate large enough $\Delta
a_e$ and $\Delta a_\mu$ to accommodate the experimental results. Sizable
$\Delta a_e$ and $\Delta a_\mu$ can be generated from non-chiral interactions,
but they are not contributed from the same source. The upper limit of $\mu\to
e\gamma$ decay gives the most severe constraints on photonic penguin
contributions in $\mu\to e$ transitions, but the situation may change in
considering future experimental sensitivities. The $Z$-penguin diagrams can
constrain chiral interaction better than photonic penguin diagrams in $\mu\to
e$ transitions. In most of the parameter space, box contributions to $\mu\to
3e$ decay are subleading. In $\tau\to e$ $(\mu)$ transitions, the present
$\tau\to e\gamma$ $(\mu \gamma)$ upper limit constrains the photonic penguin
contribution better than the $\tau\to 3 e$ $(3\mu)$ upper limit, and
$Z$-penguin amplitudes constrain chiral interaction better than photonic
penguin amplitudes. Box contributions to $\tau\to 3e$ and $\tau\to 3\mu$ decays
can sometime be comparable to $Z$-penguin contributions. The $\tau^-\to e^-
\mu^+ e^-$ and $\tau^-\to \mu^- e^+ \mu^-$ rates are highly constrained by
$\tau\to e\gamma$, $\mu\to e\gamma$ and $\tau\to \mu\gamma$, $\mu\to e\gamma$
upper limits, respectively. We compare the current experimental upper limits,
future sensitivities and bounds from consistency on various muon and tau LFV
processes.
| [
{
"created": "Thu, 23 Apr 2020 09:05:37 GMT",
"version": "v1"
},
{
"created": "Mon, 11 May 2020 15:23:49 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Sep 2020 09:53:03 GMT",
"version": "v3"
}
] | 2020-10-07 | [
[
"Chua",
"Chun-Khiang",
""
]
] | We study anomalous magnetic moments and flavor violating processes of $e$, $\mu$ and $\tau$ leptons. We use a data driven approach to investigate the implications of the present data on the parameters of a class of models, which has spin-0 scalar and spin-1/2 fermion fields. We compare two different cases, which has or does not have a built-in cancelation mechanism. Our findings are as following. Chiral interactions are unable to generate large enough $\Delta a_e$ and $\Delta a_\mu$ to accommodate the experimental results. Sizable $\Delta a_e$ and $\Delta a_\mu$ can be generated from non-chiral interactions, but they are not contributed from the same source. The upper limit of $\mu\to e\gamma$ decay gives the most severe constraints on photonic penguin contributions in $\mu\to e$ transitions, but the situation may change in considering future experimental sensitivities. The $Z$-penguin diagrams can constrain chiral interaction better than photonic penguin diagrams in $\mu\to e$ transitions. In most of the parameter space, box contributions to $\mu\to 3e$ decay are subleading. In $\tau\to e$ $(\mu)$ transitions, the present $\tau\to e\gamma$ $(\mu \gamma)$ upper limit constrains the photonic penguin contribution better than the $\tau\to 3 e$ $(3\mu)$ upper limit, and $Z$-penguin amplitudes constrain chiral interaction better than photonic penguin amplitudes. Box contributions to $\tau\to 3e$ and $\tau\to 3\mu$ decays can sometime be comparable to $Z$-penguin contributions. The $\tau^-\to e^- \mu^+ e^-$ and $\tau^-\to \mu^- e^+ \mu^-$ rates are highly constrained by $\tau\to e\gamma$, $\mu\to e\gamma$ and $\tau\to \mu\gamma$, $\mu\to e\gamma$ upper limits, respectively. We compare the current experimental upper limits, future sensitivities and bounds from consistency on various muon and tau LFV processes. |
2304.08656 | Motohiko Yoshimura | Kunio Kaneta, Kin-ya Oda, and Motohiko Yoshimura | Constraints on extended Jordan-Brans-Dicke gravity | Accepted version by JCAP. 27 pages and 4 figures | null | null | null | hep-ph gr-qc | http://creativecommons.org/licenses/by/4.0/ | Cosmological analysis of extended Jordan-Brans-Dicke (eJBD) gravity is
presented in the Einstein metric frame in which gravitational interaction is
readily understandable. Our formulation is the first systematic investigation
of how to introduce lagrangian of standard particle physics in eJBD framework
consistently with the general principle of spontaneously broken gauge symmetry,
which makes it possible to confront eJBD-based cosmology with observational and
laboratory bounds on time variation of parameters, masses, and coupling
constants, caused by time evolution of eJBD fields. Decomposition of standard
particle physics lagrangian into independent gauge invariant pieces is proposed
to avoid serious conflict that may arise from standard lagrangian transformed
from the Jordan frame. Independent conformal factors are assigned to each of
five gauge invariant pieces. The formulation is most unambiguously made
possible by defining fields having canonical kinetic terms that allow us to use
the canonical quantization rule of field theory. This construction gives as one
of its consequences the canonical eJBD field $\chi$ that couples to the
universal fermion current, a linear combination of baryon and lepton number
currents, $\partial_{\mu} \chi (\frac{1}{3} j_B^{\mu} + j_L^{\mu})$, in
addition to the conventional trace of the energy-momentum tensor. Field
equation of eJBD field along with gravitational equation is analyzed by using a
simplified polynomial class of potential and conformal functions, giving time
evolution of radiation, matter and dark energy densities consistent with
observations when an appropriate set of model parameters are used. Finite
temperature corrections are further calculated to give temperature dependent
terms in eJBD field potential.
| [
{
"created": "Mon, 17 Apr 2023 23:16:05 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Oct 2023 08:37:09 GMT",
"version": "v2"
}
] | 2023-10-03 | [
[
"Kaneta",
"Kunio",
""
],
[
"Oda",
"Kin-ya",
""
],
[
"Yoshimura",
"Motohiko",
""
]
] | Cosmological analysis of extended Jordan-Brans-Dicke (eJBD) gravity is presented in the Einstein metric frame in which gravitational interaction is readily understandable. Our formulation is the first systematic investigation of how to introduce lagrangian of standard particle physics in eJBD framework consistently with the general principle of spontaneously broken gauge symmetry, which makes it possible to confront eJBD-based cosmology with observational and laboratory bounds on time variation of parameters, masses, and coupling constants, caused by time evolution of eJBD fields. Decomposition of standard particle physics lagrangian into independent gauge invariant pieces is proposed to avoid serious conflict that may arise from standard lagrangian transformed from the Jordan frame. Independent conformal factors are assigned to each of five gauge invariant pieces. The formulation is most unambiguously made possible by defining fields having canonical kinetic terms that allow us to use the canonical quantization rule of field theory. This construction gives as one of its consequences the canonical eJBD field $\chi$ that couples to the universal fermion current, a linear combination of baryon and lepton number currents, $\partial_{\mu} \chi (\frac{1}{3} j_B^{\mu} + j_L^{\mu})$, in addition to the conventional trace of the energy-momentum tensor. Field equation of eJBD field along with gravitational equation is analyzed by using a simplified polynomial class of potential and conformal functions, giving time evolution of radiation, matter and dark energy densities consistent with observations when an appropriate set of model parameters are used. Finite temperature corrections are further calculated to give temperature dependent terms in eJBD field potential. |
1512.00006 | Felix Ringer | Grigory Ovanesyan, Felix Ringer, Ivan Vitev | Initial-state splitting kernels in cold nuclear matter | 8 pages, 4 figures | null | 10.1016/j.physletb.2016.07.054 | ACFI-T15-18 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive medium-induced splitting kernels for energetic partons that undergo
interactions in dense QCD matter before a hard-scattering event at large
momentum transfer $Q^2$. Working in the framework of the effective theory ${\rm
SCET}_{\rm G}\,$, we compute the splitting kernels beyond the soft gluon
approximation. We present numerical studies that compare our new results with
previous findings. We expect the full medium-induced splitting kernels to be
most relevant for the extension of initial-state cold nuclear matter energy
loss phenomenology in both p+A and A+A collisions.
| [
{
"created": "Mon, 30 Nov 2015 21:00:00 GMT",
"version": "v1"
}
] | 2016-08-24 | [
[
"Ovanesyan",
"Grigory",
""
],
[
"Ringer",
"Felix",
""
],
[
"Vitev",
"Ivan",
""
]
] | We derive medium-induced splitting kernels for energetic partons that undergo interactions in dense QCD matter before a hard-scattering event at large momentum transfer $Q^2$. Working in the framework of the effective theory ${\rm SCET}_{\rm G}\,$, we compute the splitting kernels beyond the soft gluon approximation. We present numerical studies that compare our new results with previous findings. We expect the full medium-induced splitting kernels to be most relevant for the extension of initial-state cold nuclear matter energy loss phenomenology in both p+A and A+A collisions. |
2407.14075 | Dhruv Ringe Mr. | Dhruv Ringe | Domain wall constraints on the doublet left-right symmetric model from
pulsar timing array data | 26 pages, 8 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Recent evidence of a stochastic gravitational wave (GW) background found by
NANOGrav and other pulsar timing array (PTA) collaborations has inspired many
studies looking for possible sources. We consider the hypothesis that the GW
signature is produced by domain walls (DWs) arising in the doublet left-right
symmetric model (DLRSM) due to the spontaneous breaking of the discrete parity
symmetry. The DW network consists of two types of DWs, namely $Z_2$ and $LR$
DWs, which have different surface tensions. We find kink solutions for both
types of DWs and obtain the parametric dependence of the surface tension.
Considering the GW signal from the DLRSM DW model with and without the
contribution from supermassive black hole binaries, we perform a Bayesian
analysis using the PTA data to estimate the posterior distribution and identify
best-fit parameter ranges. The PTA data favors a parity-breaking scale of
$\mathcal{O}(10^5)$\,GeV, and a biased potential $V_{\rm{bias}}\sim
(\mathcal{O}(100)\,\rm{MeV})^4$. The model with only DLRSM DWs is slightly
favored over the model where additional SMBHB contribution is considered.
| [
{
"created": "Fri, 19 Jul 2024 07:11:09 GMT",
"version": "v1"
}
] | 2024-07-22 | [
[
"Ringe",
"Dhruv",
""
]
] | Recent evidence of a stochastic gravitational wave (GW) background found by NANOGrav and other pulsar timing array (PTA) collaborations has inspired many studies looking for possible sources. We consider the hypothesis that the GW signature is produced by domain walls (DWs) arising in the doublet left-right symmetric model (DLRSM) due to the spontaneous breaking of the discrete parity symmetry. The DW network consists of two types of DWs, namely $Z_2$ and $LR$ DWs, which have different surface tensions. We find kink solutions for both types of DWs and obtain the parametric dependence of the surface tension. Considering the GW signal from the DLRSM DW model with and without the contribution from supermassive black hole binaries, we perform a Bayesian analysis using the PTA data to estimate the posterior distribution and identify best-fit parameter ranges. The PTA data favors a parity-breaking scale of $\mathcal{O}(10^5)$\,GeV, and a biased potential $V_{\rm{bias}}\sim (\mathcal{O}(100)\,\rm{MeV})^4$. The model with only DLRSM DWs is slightly favored over the model where additional SMBHB contribution is considered. |
1010.5803 | Ivan Vitev | I. Vitev | A brief overview of fixed-order perturbative QCD calculations of jet
production in heavy-ion collisions | 10 pages, 4 eps figures | Prog.Theor.Phys.Suppl.187:68-77,2011 | 10.1143/PTPS.187.68 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review recent developments in the QCD description of jet production and
modification in reactions with heavy nuclei at relativistic energies. Our goal
is to formulate a perturbative expansion in the presence of nuclear matter that
allows to systematically improve the accuracy of the theoretical predictions.
As an example, we present calculations of inclusive jet cross sections at RHIC,
Z0/gamma*-tagged jet cross sections at the LHC, and jet shapes that include
both next-to-leading order perturbative effects and the effects of the nuclear
medium.
| [
{
"created": "Wed, 27 Oct 2010 20:40:37 GMT",
"version": "v1"
}
] | 2011-05-27 | [
[
"Vitev",
"I.",
""
]
] | We review recent developments in the QCD description of jet production and modification in reactions with heavy nuclei at relativistic energies. Our goal is to formulate a perturbative expansion in the presence of nuclear matter that allows to systematically improve the accuracy of the theoretical predictions. As an example, we present calculations of inclusive jet cross sections at RHIC, Z0/gamma*-tagged jet cross sections at the LHC, and jet shapes that include both next-to-leading order perturbative effects and the effects of the nuclear medium. |
1912.09248 | Maria Gomez-Rocha | Mar\'ia G\'omez-Rocha and Enrique Ruiz Arriola | $\pi\pi$ scattering in a renormalized Hamiltonian matrix | 5 pages, 4 figures, presented by Mar\'ia G\'omez-Rocha at Light Cone
2019, 16-20 September 2016, Palaiseau, France | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A Wilsonian approach to $\pi\pi$ scattering based in the Glazek-Wilson
Similarity Renormalization Group (SRG) for Hamiltonians is analyzed in momentum
space up to a maximal CM energy of $\sqrt{s}=1.4$ GeV. To this end, we identify
the corresponding relativistic Hamiltonian by means of the 3D reduction of the
Bethe-Salpeter equation in the Kadyshevsky scheme, introduce a momentum grid
and provide an isospectral definition of the phase-shift based on a spectral
shift of a Chebyshev angle. We also propose a new method to integrate the SRG
equations based on the Crank-Nicolson algorithm with a single step finite
difference so that isospectrality is preserved at any step of the calculations.
We discuss issues on the unnatural high momentum tails present in the fitted
interactions and reaching far beyond the maximal CM energy of $\sqrt{s}=1.4$
GeV and how these tails can be integrated out explicitly by using
Block-Diagonal generators of the SRG.
| [
{
"created": "Thu, 19 Dec 2019 15:01:16 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Dec 2019 08:51:57 GMT",
"version": "v2"
}
] | 2019-12-23 | [
[
"Gómez-Rocha",
"María",
""
],
[
"Arriola",
"Enrique Ruiz",
""
]
] | A Wilsonian approach to $\pi\pi$ scattering based in the Glazek-Wilson Similarity Renormalization Group (SRG) for Hamiltonians is analyzed in momentum space up to a maximal CM energy of $\sqrt{s}=1.4$ GeV. To this end, we identify the corresponding relativistic Hamiltonian by means of the 3D reduction of the Bethe-Salpeter equation in the Kadyshevsky scheme, introduce a momentum grid and provide an isospectral definition of the phase-shift based on a spectral shift of a Chebyshev angle. We also propose a new method to integrate the SRG equations based on the Crank-Nicolson algorithm with a single step finite difference so that isospectrality is preserved at any step of the calculations. We discuss issues on the unnatural high momentum tails present in the fitted interactions and reaching far beyond the maximal CM energy of $\sqrt{s}=1.4$ GeV and how these tails can be integrated out explicitly by using Block-Diagonal generators of the SRG. |
hep-ph/0309094 | Ivan Vitev | Jianwei Qiu, Ivan Vitev | Resummed QCD Power Corrections to Nuclear Shadowing | 4 pages, 3 figures, uses RevTeX 4. As published in Phys.Rev.Lett | Phys.Rev.Lett. 93 (2004) 262301 | 10.1103/PhysRevLett.93.262301 | null | hep-ph nucl-th | null | We calculate and resum a perturbative expansion of nuclear enhanced power
corrections to the structure functions measured in deeply inelastic scattering
of leptons on a nuclear target. Our results for the Bjorken $x$-, $Q^2$- and
$A$-dependence of nuclear shadowing in $F_2^A(x,Q^2)$ and the nuclear
modifications to $F_L^A(x,Q^2)$, obtained in terms of the QCD factorization
approach, are consistent with the existing data. We demonstrate that the
low-$Q^2$ behavior of these data and the measured large longitudinal structure
function point to a critical role for the power corrections when compared to
other theoretical approaches.
| [
{
"created": "Tue, 9 Sep 2003 19:11:10 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jan 2005 22:44:20 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Qiu",
"Jianwei",
""
],
[
"Vitev",
"Ivan",
""
]
] | We calculate and resum a perturbative expansion of nuclear enhanced power corrections to the structure functions measured in deeply inelastic scattering of leptons on a nuclear target. Our results for the Bjorken $x$-, $Q^2$- and $A$-dependence of nuclear shadowing in $F_2^A(x,Q^2)$ and the nuclear modifications to $F_L^A(x,Q^2)$, obtained in terms of the QCD factorization approach, are consistent with the existing data. We demonstrate that the low-$Q^2$ behavior of these data and the measured large longitudinal structure function point to a critical role for the power corrections when compared to other theoretical approaches. |
hep-ph/0305229 | Domenico Falcone | D. Falcone | Inverting the seesaw formula | 12 pages, RevTex4. Few corrections and one reference added | Phys.Rev. D68 (2003) 033002 | 10.1103/PhysRevD.68.033002 | DSF-16/2003 | hep-ph | null | By inverting the seesaw formula we determine the heavy neutrino mass matrix.
The impact on the baryogenesis via leptogenesis and the radiative lepton decays
in supersymmetric models is described. Links to neutrinoless double beta decay
are also briefly discussed. The analysis leads to two distinct matrix models.
One has small mixings while the other has one maximal mixing. Both cannot give
a sufficient amount of baryon asymmetry. Then we also comment on a different
form of the Dirac neutrino mass matrix, which does provide sufficient baryon
asymmetry. In a supersymmetric scenario the branching ratios of radiative
lepton decays are enhanced for this model.
| [
{
"created": "Wed, 21 May 2003 10:28:36 GMT",
"version": "v1"
},
{
"created": "Wed, 28 May 2003 08:48:00 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Falcone",
"D.",
""
]
] | By inverting the seesaw formula we determine the heavy neutrino mass matrix. The impact on the baryogenesis via leptogenesis and the radiative lepton decays in supersymmetric models is described. Links to neutrinoless double beta decay are also briefly discussed. The analysis leads to two distinct matrix models. One has small mixings while the other has one maximal mixing. Both cannot give a sufficient amount of baryon asymmetry. Then we also comment on a different form of the Dirac neutrino mass matrix, which does provide sufficient baryon asymmetry. In a supersymmetric scenario the branching ratios of radiative lepton decays are enhanced for this model. |
2202.04035 | Rui Santos | Felix Egle, Margarete M\"uhlleitner, Rui Santos, Jo\~ao Viana | One-loop Corrections to the Higgs Boson Invisible Decay in a Complex
Singlet Extension of the SM | 35 pages, 8 figures | null | 10.1103/PhysRevD.106.095030 | KA-TP-01-2022 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The search for dark matter (DM) at colliders is founded on the idea of
looking for something invisible. There are searches based on production and
decay processes where DM may reveal itself as missing energy. If nothing is
found, our best tool to constrain the parameter space of many extensions of the
Standard Model (SM) with a DM candidate is the Higgs boson. As the measurements
of the Higgs couplings become increasingly precise, higher-order corrections
will start to play a major role. The tree-level contribution to the invisible
decay width provides information about the portal coupling. Higher-order
corrections also gives us access to other parameters from the dark sector of
the Higgs potential that are not present in the tree-level amplitude. In this
work we will focus on the complex singlet extension of the SM in the phase with
a DM candidate. We calculate the one-loop electroweak corrections to the decay
of the Higgs boson into two DM particles. We find that the corrections are
stable and of the order of a few percent. The present measurement of the Higgs
invisible branching ratio, BR$(H \to$ invisible $) < 0.11$, already constrains
the parameter space of the model at leading order. We expect that by the end of
the LHC the experimental measurement will require the inclusion of the
electroweak corrections to the decay in order to match the experimental
accuracy. Furthermore, the only competing process, which is direct detection,
is shown to have a cross section below the neutrino floor.
| [
{
"created": "Tue, 8 Feb 2022 18:04:24 GMT",
"version": "v1"
}
] | 2022-12-07 | [
[
"Egle",
"Felix",
""
],
[
"Mühlleitner",
"Margarete",
""
],
[
"Santos",
"Rui",
""
],
[
"Viana",
"João",
""
]
] | The search for dark matter (DM) at colliders is founded on the idea of looking for something invisible. There are searches based on production and decay processes where DM may reveal itself as missing energy. If nothing is found, our best tool to constrain the parameter space of many extensions of the Standard Model (SM) with a DM candidate is the Higgs boson. As the measurements of the Higgs couplings become increasingly precise, higher-order corrections will start to play a major role. The tree-level contribution to the invisible decay width provides information about the portal coupling. Higher-order corrections also gives us access to other parameters from the dark sector of the Higgs potential that are not present in the tree-level amplitude. In this work we will focus on the complex singlet extension of the SM in the phase with a DM candidate. We calculate the one-loop electroweak corrections to the decay of the Higgs boson into two DM particles. We find that the corrections are stable and of the order of a few percent. The present measurement of the Higgs invisible branching ratio, BR$(H \to$ invisible $) < 0.11$, already constrains the parameter space of the model at leading order. We expect that by the end of the LHC the experimental measurement will require the inclusion of the electroweak corrections to the decay in order to match the experimental accuracy. Furthermore, the only competing process, which is direct detection, is shown to have a cross section below the neutrino floor. |
1607.07754 | Marzieh Mottaghizadeh | Marzieh Mottaghizadeh, Parvin Eslami and Fatemeh Taghavi-Shahri | Decoupling the NLO coupled QED $\otimes$ QCD, DGLAP evolution
equations,Using Laplace Transform Method | 16 pages, 7 figures | Int. J. Mod. Phys. A 32, 1750065 (2017) | 10.1142/S0217751X17500658 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analytically solved the QED $\otimes$ QCD coupled DGLAP evolution
equations at leading order (LO) quantum electrodynamics (QED) and next to
leading order (NLO) quantum chromodynamics (QCD) approximations, using the
Laplace transform method and then computed the proton structure function in
terms of the unpolarized parton distributions functions. Our analyitical
solutions for parton densities are in good agreement with those from APFEL (A
PDF Evolution Library) (Computer Physics Communications 185, 1647-1668 (2014))
and CT14QED (Phys. Rev. D 93, 114015 (2016)) global parameterizations. We also
compared the proton structure function, $F_{2}^{p}(x,Q^{2})$, with experimental
data released by the ZEUS and H1 collaborations at HERA. There is a nice
agreement between them in the range of low and high x and $Q^{2}$.
| [
{
"created": "Tue, 26 Jul 2016 15:27:24 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jul 2017 08:51:16 GMT",
"version": "v2"
},
{
"created": "Thu, 6 Jul 2017 08:23:02 GMT",
"version": "v3"
}
] | 2017-07-07 | [
[
"Mottaghizadeh",
"Marzieh",
""
],
[
"Eslami",
"Parvin",
""
],
[
"Taghavi-Shahri",
"Fatemeh",
""
]
] | We analytically solved the QED $\otimes$ QCD coupled DGLAP evolution equations at leading order (LO) quantum electrodynamics (QED) and next to leading order (NLO) quantum chromodynamics (QCD) approximations, using the Laplace transform method and then computed the proton structure function in terms of the unpolarized parton distributions functions. Our analyitical solutions for parton densities are in good agreement with those from APFEL (A PDF Evolution Library) (Computer Physics Communications 185, 1647-1668 (2014)) and CT14QED (Phys. Rev. D 93, 114015 (2016)) global parameterizations. We also compared the proton structure function, $F_{2}^{p}(x,Q^{2})$, with experimental data released by the ZEUS and H1 collaborations at HERA. There is a nice agreement between them in the range of low and high x and $Q^{2}$. |
hep-ph/0307299 | Maxim Pospelov | E. J. Copeland, N. J. Nunes and M. Pospelov | Models of quintessence coupled to the electromagnetic field and the
cosmological evolution of alpha | 13 pages, 10 figures, RevTex, new references added | Phys.Rev. D69 (2004) 023501 | 10.1103/PhysRevD.69.023501 | UVIC-TH-2003-05 | hep-ph astro-ph | null | We study the change of the effective fine structure constant in the
cosmological models of a scalar field with a non-vanishing coupling to the
electromagnetic field. Combining cosmological data and terrestrial observations
we place empirical constraints on the size of the possible coupling and explore
a large class of models that exhibit tracking behavior. The change of the fine
structure constant implied by the quasar absorption spectra together with the
requirement of tracking behavior impose a lower bound of the size of this
coupling. Furthermore, the transition to the quintessence regime implies a
narrow window for this coupling around $10^{-5}$ in units of the inverse Planck
mass. We also propose a non-minimal coupling between electromagnetism and
quintessence which has the effect of leading only to changes of alpha
determined from atomic physics phenomena, but leaving no observable
consequences through nuclear physics effects. In doing so we are able to
reconcile the claimed cosmological evidence for a changing fine structure
constant with the tight constraints emerging from the Oklo natural nuclear
reactor.
| [
{
"created": "Thu, 24 Jul 2003 07:23:52 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Sep 2003 19:46:40 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Copeland",
"E. J.",
""
],
[
"Nunes",
"N. J.",
""
],
[
"Pospelov",
"M.",
""
]
] | We study the change of the effective fine structure constant in the cosmological models of a scalar field with a non-vanishing coupling to the electromagnetic field. Combining cosmological data and terrestrial observations we place empirical constraints on the size of the possible coupling and explore a large class of models that exhibit tracking behavior. The change of the fine structure constant implied by the quasar absorption spectra together with the requirement of tracking behavior impose a lower bound of the size of this coupling. Furthermore, the transition to the quintessence regime implies a narrow window for this coupling around $10^{-5}$ in units of the inverse Planck mass. We also propose a non-minimal coupling between electromagnetism and quintessence which has the effect of leading only to changes of alpha determined from atomic physics phenomena, but leaving no observable consequences through nuclear physics effects. In doing so we are able to reconcile the claimed cosmological evidence for a changing fine structure constant with the tight constraints emerging from the Oklo natural nuclear reactor. |
0809.5221 | Koji Tsumura | Takeshi Fukuyama, Koji Tsumura | Detecting Majorana nature of neutrinos in muon and tau decay | 4 pages, 1 figure; Added references | null | null | IC/2008/082 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Majorana nature of neutrinos can be detected by the precise measurement
of muon decay. This possibility comes from the presence of charged Higgs boson
interaction for Majorana neutrinos. We study the effects of the neutrino Yukawa
interaction via charged Higgs bosons in muon decay processes such as $\mu\to
e\nu\bar{\nu}$ and $\mu\to e\gamma$. The Higgs triplet model with small vacuum
expectation value is of special importance whose neutrino Yukawa coupling can
affect significantly muon decays. External neutrino lines in the Feynman
diagrams of $\mu\to e\nu\bar{\nu}$ can be crossed because of its Majorana
nature. This fact provides the interference contribution between the W boson
exchange diagram and that of charged Higgs boson, which may be detectable in
near future experiments.
| [
{
"created": "Tue, 30 Sep 2008 15:08:42 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Oct 2008 08:20:22 GMT",
"version": "v2"
}
] | 2008-10-16 | [
[
"Fukuyama",
"Takeshi",
""
],
[
"Tsumura",
"Koji",
""
]
] | The Majorana nature of neutrinos can be detected by the precise measurement of muon decay. This possibility comes from the presence of charged Higgs boson interaction for Majorana neutrinos. We study the effects of the neutrino Yukawa interaction via charged Higgs bosons in muon decay processes such as $\mu\to e\nu\bar{\nu}$ and $\mu\to e\gamma$. The Higgs triplet model with small vacuum expectation value is of special importance whose neutrino Yukawa coupling can affect significantly muon decays. External neutrino lines in the Feynman diagrams of $\mu\to e\nu\bar{\nu}$ can be crossed because of its Majorana nature. This fact provides the interference contribution between the W boson exchange diagram and that of charged Higgs boson, which may be detectable in near future experiments. |
2106.03876 | Stephen King | Stephen F. King | Twin Pati-Salam theory of flavour with a TeV scale vector leptoquark | Version published in JHEP | JHEP 11 (2021) 161 | 10.1007/JHEP11(2021)161 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a twin Pati-Salam (PS) theory of flavour broken to the $G_{4321}$
gauge group at high energies, then to the Standard Model at low energies,
yielding a TeV scale vector leptoquark $U^{\mu}_1(3,1,2/3)$ which has been
suggested to address the lepton universality anomalies $R_{K^{(*)}}$ and
$R_{D^{(*)}}$ in $B$ decays. Quark and lepton masses are mediated by
vector-like fermions, with personal Higgs doublets for the second and third
families, which may be replaced by a two Higgs doublet model (2HDM). The twin
PS theory of flavour successfully accounts for all quark and lepton (including
neutrino) masses and mixings, and predicts a dominant coupling of
$U^{\mu}_1(3,1,2/3)$ to the third family left-handed doublets. However the
predicted mass matrices, assuming natural values of the parameters, are not
consistent with the single vector leptoquark solution to the $R_{D^{(*)}}$
anomaly, given its current value.
| [
{
"created": "Mon, 7 Jun 2021 18:00:12 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Jun 2021 09:42:47 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Nov 2021 07:51:07 GMT",
"version": "v3"
}
] | 2021-11-24 | [
[
"King",
"Stephen F.",
""
]
] | We propose a twin Pati-Salam (PS) theory of flavour broken to the $G_{4321}$ gauge group at high energies, then to the Standard Model at low energies, yielding a TeV scale vector leptoquark $U^{\mu}_1(3,1,2/3)$ which has been suggested to address the lepton universality anomalies $R_{K^{(*)}}$ and $R_{D^{(*)}}$ in $B$ decays. Quark and lepton masses are mediated by vector-like fermions, with personal Higgs doublets for the second and third families, which may be replaced by a two Higgs doublet model (2HDM). The twin PS theory of flavour successfully accounts for all quark and lepton (including neutrino) masses and mixings, and predicts a dominant coupling of $U^{\mu}_1(3,1,2/3)$ to the third family left-handed doublets. However the predicted mass matrices, assuming natural values of the parameters, are not consistent with the single vector leptoquark solution to the $R_{D^{(*)}}$ anomaly, given its current value. |
hep-ph/0306002 | Fu-Sin Ling | Aseshkrishna Datta, Fu-Sin Ling and Pierre Ramond | Correlated Hierarchy, Dirac Masses and Large Mixing Angles | 15 pages, no fig, some refs. added | Nucl.Phys. B671 (2003) 383-400 | 10.1016/j.nuclphysb.2003.08.026 | UFIFT-HEP-03/14 | hep-ph | null | We introduce a new parametrization of the MNS lepton mixing matrix which
separates the hierarchical Grand Unified relations among quarks and leptons. We
argue that one large angle stems from the charged leptons, the other from the
seesaw structure of the neutral lepton mass matrix. We show how two large
mixing angles can arise naturally provided there are special requirements on
the Dirac ($\Delta I_{\rm w}=1/2$) and Majorana ($\Delta I_{\rm w}=0$) masses.
One possibility is a correlated hierarchy between them, the other is that the
$\Delta I_{\rm w}=0$ Majorana mass has a specific texture; it is Dirac-like for
two of the three families.
| [
{
"created": "Sat, 31 May 2003 06:28:22 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Aug 2003 21:37:10 GMT",
"version": "v2"
}
] | 2010-04-05 | [
[
"Datta",
"Aseshkrishna",
""
],
[
"Ling",
"Fu-Sin",
""
],
[
"Ramond",
"Pierre",
""
]
] | We introduce a new parametrization of the MNS lepton mixing matrix which separates the hierarchical Grand Unified relations among quarks and leptons. We argue that one large angle stems from the charged leptons, the other from the seesaw structure of the neutral lepton mass matrix. We show how two large mixing angles can arise naturally provided there are special requirements on the Dirac ($\Delta I_{\rm w}=1/2$) and Majorana ($\Delta I_{\rm w}=0$) masses. One possibility is a correlated hierarchy between them, the other is that the $\Delta I_{\rm w}=0$ Majorana mass has a specific texture; it is Dirac-like for two of the three families. |
1105.3725 | Christophe Grojean | Andrzej J. Buras, Christophe Grojean, Stefan Pokorski, Robert Ziegler | FCNC Effects in a Minimal Theory of Fermion Masses | 19 pages, 1 figure | null | 10.1007/JHEP08(2011)028 | CERN-PH-TH/2011-117, FLAVOUR(267104)-ERC-1, TUM-HEP-807/11 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As a minimal theory of fermion masses we extend the SM by heavy vectorlike
fermions, with flavor-anarchical Yukawa couplings, that mix with chiral
fermions such that small SM Yukawa couplings arise from small mixing angles.
This model can be regarded as an effective description of the fermionic sector
of a large class of existing flavor models and thus might serve as a useful
reference frame for a further understanding of flavor hierarchies in the SM.
Already such a minimal framework gives rise to FCNC effects through exchange of
massive SM bosons whose couplings to the light fermions get modified by the
mixing. We derive general formulae for these corrections and discuss the bounds
on the heavy fermion masses. Particularly stringent bounds, in a few TeV range,
come from the corrections to the Z couplings.
| [
{
"created": "Wed, 18 May 2011 19:59:34 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Buras",
"Andrzej J.",
""
],
[
"Grojean",
"Christophe",
""
],
[
"Pokorski",
"Stefan",
""
],
[
"Ziegler",
"Robert",
""
]
] | As a minimal theory of fermion masses we extend the SM by heavy vectorlike fermions, with flavor-anarchical Yukawa couplings, that mix with chiral fermions such that small SM Yukawa couplings arise from small mixing angles. This model can be regarded as an effective description of the fermionic sector of a large class of existing flavor models and thus might serve as a useful reference frame for a further understanding of flavor hierarchies in the SM. Already such a minimal framework gives rise to FCNC effects through exchange of massive SM bosons whose couplings to the light fermions get modified by the mixing. We derive general formulae for these corrections and discuss the bounds on the heavy fermion masses. Particularly stringent bounds, in a few TeV range, come from the corrections to the Z couplings. |
1109.6009 | Yang Bai | Yang Bai and Arvind Rajaraman | Dark Matter Jets at the LHC | 4 pages, 2 figures | null | null | SLAC-PUB-14617, UCI-TR-2011-21 | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that dark matter particles which have strong interactions with the
Standard Model particles are not excluded by current astrophysical constraints.
These dark matter particles have unique signatures at colliders; instead of
missing energy, the dark matter particles produce jets. We propose a new search
strategy for such strongly interacting particles by looking for a signal of two
trackless jets. We show that suitable cuts can plausibly allow us to find these
signals at the LHC even in early data.
| [
{
"created": "Tue, 27 Sep 2011 20:00:01 GMT",
"version": "v1"
}
] | 2011-09-29 | [
[
"Bai",
"Yang",
""
],
[
"Rajaraman",
"Arvind",
""
]
] | We argue that dark matter particles which have strong interactions with the Standard Model particles are not excluded by current astrophysical constraints. These dark matter particles have unique signatures at colliders; instead of missing energy, the dark matter particles produce jets. We propose a new search strategy for such strongly interacting particles by looking for a signal of two trackless jets. We show that suitable cuts can plausibly allow us to find these signals at the LHC even in early data. |
2103.01862 | Victor Goncalves | V. P. Goncalves, D. E. Martins, M. S. Rangel | Searching for axionlike particles with low masses in $pPb$ and $PbPb$
collisions | 6 pages, 3 figures, 2 tables | null | 10.1140/epjc/s10052-021-09314-2 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The production of axionlike particles (ALPs) with small masses in
ultraperipheral $Pb - p$ and $Pb - Pb$ collisions at the LHC is investigated.
The cross section and kinematical distributions associated to the diphoton
final state produced in the $\gamma \gamma \rightarrow a \rightarrow \gamma
\gamma$ subprocesses are estimated considering a realistic set of kinematical
cuts. A detailed analysis of the backgrounds is performed and the expected
sensitivity to the ALP production is derived. Our results demonstrate that a
future experimental analysis of the exclusive diphoton production for the
forward rapidities probed by the LHCb detector can improve the existing
exclusion limits on the ALP - photon coupling in the mass range 2 GeV $\le m_a
\le$ 5 GeV.
| [
{
"created": "Tue, 2 Mar 2021 16:56:45 GMT",
"version": "v1"
}
] | 2021-07-07 | [
[
"Goncalves",
"V. P.",
""
],
[
"Martins",
"D. E.",
""
],
[
"Rangel",
"M. S.",
""
]
] | The production of axionlike particles (ALPs) with small masses in ultraperipheral $Pb - p$ and $Pb - Pb$ collisions at the LHC is investigated. The cross section and kinematical distributions associated to the diphoton final state produced in the $\gamma \gamma \rightarrow a \rightarrow \gamma \gamma$ subprocesses are estimated considering a realistic set of kinematical cuts. A detailed analysis of the backgrounds is performed and the expected sensitivity to the ALP production is derived. Our results demonstrate that a future experimental analysis of the exclusive diphoton production for the forward rapidities probed by the LHCb detector can improve the existing exclusion limits on the ALP - photon coupling in the mass range 2 GeV $\le m_a \le$ 5 GeV. |
hep-ph/0405157 | Pran Nath | Utpal Chattopadhyay and Pran Nath | Modular Invariant Soft Breaking, WMAP, Dark Matter and Sparticle Mass
Limits | 29 pages, 10 figures | Phys.Rev. D70 (2004) 096009 | 10.1103/PhysRevD.70.096009 | null | hep-ph astro-ph hep-th | null | An analysis of soft breaking under the constraint of modular invariance is
given. The role of dilaton and moduli dependent front factors in achieving a
modular invariant $V_{soft}$ is emphasized. Further, it is shown that in string
models $\tan\beta$ is no longer a free parameter but is determined in terms of
$\alpha_{string}$ and the other soft parameters by the constraints of modular
invariance and radiative electroweak symmetry breaking. The above framework is
then used to analyze the neutralino relic density consistent with the WMAP data
at self dual points in the Kahler and complex structure moduli. One finds that
the combined set of constraints arising from modular invariant soft breaking,
radiative electroweak symmetry breaking and WMAP lead to upper limits on
sparticle masses for $\mu>0$. These limits are investigated for a class of
models and found to lie within reach of the Tevatron and of the Large Hadron
Collider (LHC). Further, an analysis of the neutralino-proton cross section
shows that dark matter in these models can be explored in CDMS (Soudan), GENIUS
and ZEPLIN. While the analysis is carried out within the general framework of
heterotic strings, the possibility that the results of the analysis may extend
to a broader class of string models, such as models based on intersecting D
branes, is also discussed.
| [
{
"created": "Mon, 17 May 2004 20:23:05 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Chattopadhyay",
"Utpal",
""
],
[
"Nath",
"Pran",
""
]
] | An analysis of soft breaking under the constraint of modular invariance is given. The role of dilaton and moduli dependent front factors in achieving a modular invariant $V_{soft}$ is emphasized. Further, it is shown that in string models $\tan\beta$ is no longer a free parameter but is determined in terms of $\alpha_{string}$ and the other soft parameters by the constraints of modular invariance and radiative electroweak symmetry breaking. The above framework is then used to analyze the neutralino relic density consistent with the WMAP data at self dual points in the Kahler and complex structure moduli. One finds that the combined set of constraints arising from modular invariant soft breaking, radiative electroweak symmetry breaking and WMAP lead to upper limits on sparticle masses for $\mu>0$. These limits are investigated for a class of models and found to lie within reach of the Tevatron and of the Large Hadron Collider (LHC). Further, an analysis of the neutralino-proton cross section shows that dark matter in these models can be explored in CDMS (Soudan), GENIUS and ZEPLIN. While the analysis is carried out within the general framework of heterotic strings, the possibility that the results of the analysis may extend to a broader class of string models, such as models based on intersecting D branes, is also discussed. |
1605.04172 | Arsenii Titov | I. Girardi, S. T. Petcov, A. V. Titov | Predictions for the Majorana CP Violation Phases in the Neutrino Mixing
Matrix and Neutrinoless Double Beta Decay | 59 pages, includes 8 figures and 6 tables; a discussion of the
effects of the uncertainties in the values of neutrino mixing angles on the
predictions for the Majorana phases and four new related figures (two in the
main text and two in a new appendix) added | Nucl. Phys. B 911 (2016) 754-804 | 10.1016/j.nuclphysb.2016.08.019 | SISSA 26/2016/FISI, IPMU16-0064 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain predictions for the Majorana phases $\alpha_{21}/2$ and
$\alpha_{31}/2$ of the $3\times 3$ unitary neutrino mixing matrix $U =
U_e^{\dagger} \, U_{\nu}$, $U_e$ and $U_{\nu}$ being the $3\times 3$ unitary
matrices resulting from the diagonalisation of the charged lepton and neutrino
Majorana mass matrices, respectively. We focus on forms of $U_e$ and $U_{\nu}$
permitting to express $\alpha_{21}/2$ and $\alpha_{31}/2$ in terms of the Dirac
phase $\delta$ and the three neutrino mixing angles of the standard
parametrisation of $U$, and the angles and the two Majorana-like phases
$\xi_{21}/2$ and $\xi_{31}/2$ present, in general, in $U_{\nu}$. The concrete
forms of $U_{\nu}$ considered are fixed by, or associated with, symmetries
(tri-bimaximal, bimaximal, etc.), so that the angles in $U_{\nu}$ are fixed.
For each of these forms and forms of $U_e$ that allow to reproduce the measured
values of the three neutrino mixing angles $\theta_{12}$, $\theta_{23}$ and
$\theta_{13}$, we derive predictions for phase differences $(\alpha_{21}/2 -
\xi_{21}/2)$, $(\alpha_{31}/2 - \xi_{31}/2)$, etc., which are completely
determined by the values of the mixing angles. We show that the requirement of
generalised CP invariance of the neutrino Majorana mass term implies $\xi_{21}
= 0$ or $\pi$ and $\xi_{31} = 0$ or $\pi$. For these values of $\xi_{21}$ and
$\xi_{31}$ and the best fit values of $\theta_{12}$, $\theta_{23}$ and
$\theta_{13}$, we present predictions for the effective Majorana mass in
neutrinoless double beta decay for both neutrino mass spectra with normal and
inverted ordering.
| [
{
"created": "Fri, 13 May 2016 13:32:18 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Jul 2016 17:00:11 GMT",
"version": "v2"
}
] | 2016-11-02 | [
[
"Girardi",
"I.",
""
],
[
"Petcov",
"S. T.",
""
],
[
"Titov",
"A. V.",
""
]
] | We obtain predictions for the Majorana phases $\alpha_{21}/2$ and $\alpha_{31}/2$ of the $3\times 3$ unitary neutrino mixing matrix $U = U_e^{\dagger} \, U_{\nu}$, $U_e$ and $U_{\nu}$ being the $3\times 3$ unitary matrices resulting from the diagonalisation of the charged lepton and neutrino Majorana mass matrices, respectively. We focus on forms of $U_e$ and $U_{\nu}$ permitting to express $\alpha_{21}/2$ and $\alpha_{31}/2$ in terms of the Dirac phase $\delta$ and the three neutrino mixing angles of the standard parametrisation of $U$, and the angles and the two Majorana-like phases $\xi_{21}/2$ and $\xi_{31}/2$ present, in general, in $U_{\nu}$. The concrete forms of $U_{\nu}$ considered are fixed by, or associated with, symmetries (tri-bimaximal, bimaximal, etc.), so that the angles in $U_{\nu}$ are fixed. For each of these forms and forms of $U_e$ that allow to reproduce the measured values of the three neutrino mixing angles $\theta_{12}$, $\theta_{23}$ and $\theta_{13}$, we derive predictions for phase differences $(\alpha_{21}/2 - \xi_{21}/2)$, $(\alpha_{31}/2 - \xi_{31}/2)$, etc., which are completely determined by the values of the mixing angles. We show that the requirement of generalised CP invariance of the neutrino Majorana mass term implies $\xi_{21} = 0$ or $\pi$ and $\xi_{31} = 0$ or $\pi$. For these values of $\xi_{21}$ and $\xi_{31}$ and the best fit values of $\theta_{12}$, $\theta_{23}$ and $\theta_{13}$, we present predictions for the effective Majorana mass in neutrinoless double beta decay for both neutrino mass spectra with normal and inverted ordering. |
hep-ph/9705282 | J. Gunion | J.F. Gunion (U.C. Davis) | Detecting and Studying Higgs Bosons | 65 pages, to appear in ``Perspectives on Higgs Physics'', ed. G.
Kane, 2nd edition (World Scientific Publishing). Full postscript file is
available via anonymous ftp at
ftp://ucdhep.ucdavis.edu/gunion/perspectives97.ps | null | 10.1142/9789812819505_0009 | UCD-97-13 | hep-ph | null | I review the ability of the LHC (large hadron collider), NLC (next linear
lepton collider) and FMC (first muon collider) to detect and study Higgs
bosons, with emphasis on the Higgs bosons of extended Higgs sectors, especially
those of the minimal supersymmetric standard model (MSSM). Particular attention
is given to means for distinguishing the lightest neutral CP-even Higgs boson
of the MSSM from the single Higgs boson of the minimal Standard Model (SM).
| [
{
"created": "Fri, 9 May 1997 21:09:26 GMT",
"version": "v1"
}
] | 2016-11-03 | [
[
"Gunion",
"J. F.",
"",
"U.C. Davis"
]
] | I review the ability of the LHC (large hadron collider), NLC (next linear lepton collider) and FMC (first muon collider) to detect and study Higgs bosons, with emphasis on the Higgs bosons of extended Higgs sectors, especially those of the minimal supersymmetric standard model (MSSM). Particular attention is given to means for distinguishing the lightest neutral CP-even Higgs boson of the MSSM from the single Higgs boson of the minimal Standard Model (SM). |
1012.0030 | Kirill Semenov-Tian-Shansky | Bernard Pire, Kirill Semenov-Tian-Shansky, Lech Szymanowski | Baryon to meson transition distribution amplitudes and their spectral
representation | Talk presented at International Workshop on Diffraction in
High-Energy Physics DIFFRACTION 2010, September 10 - 15, 2010 Otranto
(Lecce), Italy. 4 pages | AIP Conf.Proc.1350:237-240,2011 | null | CPHT-PC098.1110, LPT-ORSAY 10-82 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the problem of construction of a spectral representation for
nucleon to meson transition distribution amplitudes (TDAs), non-diagonal matrix
elements of nonlocal three quark light-cone operators between a nucleon and a
meson states. We introduce the notion of quadruple distributions and generalize
Radyshkin's factorized Ansatz for this issue. Modelling of baryon to meson TDAs
in the complete domain of their definition opens the way to quantitative
estimates of cross-sections for various hard exclusive reactions.
| [
{
"created": "Tue, 30 Nov 2010 21:36:53 GMT",
"version": "v1"
}
] | 2012-06-07 | [
[
"Pire",
"Bernard",
""
],
[
"Semenov-Tian-Shansky",
"Kirill",
""
],
[
"Szymanowski",
"Lech",
""
]
] | We consider the problem of construction of a spectral representation for nucleon to meson transition distribution amplitudes (TDAs), non-diagonal matrix elements of nonlocal three quark light-cone operators between a nucleon and a meson states. We introduce the notion of quadruple distributions and generalize Radyshkin's factorized Ansatz for this issue. Modelling of baryon to meson TDAs in the complete domain of their definition opens the way to quantitative estimates of cross-sections for various hard exclusive reactions. |
2210.08419 | Thomas A. Trainor | Thomas A. Trainor | Mass-dependent transport of hadron species from soft to hard (nonjet to
jet) spectrum components within small collision systems at the large hadron
collider | 4 pages, 3 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In previous analyses a two-component (soft+hard) model (TCM) was developed
for identified-hadron (PID) spectra from 5 TeV $p$-Pb and 13 TeV $p$-$p$
collisions. Spectrum data are generally described within their statistical
uncertainties. Within the model are coefficients $z_{si}(n_s)$ and
$z_{hi}(n_s)$ that denote the fractions of hadron species $i$ within total soft
$\bar \rho_s$ and hard $\bar \rho_h$ charge densities and that vary
significantly with event index $n_s = \Delta \eta \bar \rho_s$. This letter
reports that variation of those coefficients with $n_s$ implies transport of
hadron species from soft component to hard component, increasingly with
increased jet production, while conserving the total particle number for each
species that is predicted by a statistical model. The extent of transport is
simply proportional to hadron mass.
| [
{
"created": "Sun, 16 Oct 2022 02:53:52 GMT",
"version": "v1"
}
] | 2022-10-18 | [
[
"Trainor",
"Thomas A.",
""
]
] | In previous analyses a two-component (soft+hard) model (TCM) was developed for identified-hadron (PID) spectra from 5 TeV $p$-Pb and 13 TeV $p$-$p$ collisions. Spectrum data are generally described within their statistical uncertainties. Within the model are coefficients $z_{si}(n_s)$ and $z_{hi}(n_s)$ that denote the fractions of hadron species $i$ within total soft $\bar \rho_s$ and hard $\bar \rho_h$ charge densities and that vary significantly with event index $n_s = \Delta \eta \bar \rho_s$. This letter reports that variation of those coefficients with $n_s$ implies transport of hadron species from soft component to hard component, increasingly with increased jet production, while conserving the total particle number for each species that is predicted by a statistical model. The extent of transport is simply proportional to hadron mass. |
hep-ph/0403173 | Ji-Feng Yang | J.-F. Yang | Trace anomalies and chiral Ward identities | 4 pages, no figure, typos removed | Chin.Phys.Lett. 21 (2004) 792 | 10.1088/0256-307X/21/5/008 | null | hep-ph hep-th | null | In a simple abelian spinor field theory, the canonical trace identities for
certain axial-vector and axial-scalar operators are reexamined in dimensional
regularization, some disagreements with previous results are found and an
interesting new phenomenon is observed and briefly discussed.
| [
{
"created": "Tue, 16 Mar 2004 07:29:49 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Jun 2006 12:48:22 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Yang",
"J. -F.",
""
]
] | In a simple abelian spinor field theory, the canonical trace identities for certain axial-vector and axial-scalar operators are reexamined in dimensional regularization, some disagreements with previous results are found and an interesting new phenomenon is observed and briefly discussed. |
hep-ph/0307196 | Grunberg | Georges Grunberg | Nonperturbative definition of the pole mass and short distance expansion
of the heavy quark potential in QCD | 10 pages, JHEP3.cls style; a few misprints corrected. To appear in
Physics Letters B | Phys.Lett. B596 (2004) 213-220 | 10.1016/j.physletb.2004.06.078 | CPHT/RR 035.0703 | hep-ph hep-lat | null | We show that the O(Lambda) ambiguity in the pole mass can be fixed in a
natural way by introducing a modified nonperturbative V-scheme momentum space
coupling tilde-alphaV(q) where the confining contributions have been subtracted
out. The method used is in the spirit of the infrared finite coupling approach
to power corrections, and gives a non perturbative definition of the `potential
subtracted' mass. The short distance expansion of the static potential is
derived, taking into account an hypothetical short distance linear term. The
magnitude of the standard OPE contributions are estimated in quenched QCD,
based on results of Luscher and Weisz. It is observed that the expansion is not
yet reliable at the shortest distances presently measured on the lattice.
| [
{
"created": "Tue, 15 Jul 2003 15:59:21 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Jul 2003 09:33:41 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Jul 2003 12:37:07 GMT",
"version": "v3"
},
{
"created": "Thu, 31 Jul 2003 17:14:12 GMT",
"version": "v4"
},
{
"created": "Fri, 18 Jun 2004 11:26:41 GMT",
"version": "v5"
},
{
"created": "Thu, 24 Jun 2004 09:11:28 GMT",
"version": "v6"
}
] | 2009-11-10 | [
[
"Grunberg",
"Georges",
""
]
] | We show that the O(Lambda) ambiguity in the pole mass can be fixed in a natural way by introducing a modified nonperturbative V-scheme momentum space coupling tilde-alphaV(q) where the confining contributions have been subtracted out. The method used is in the spirit of the infrared finite coupling approach to power corrections, and gives a non perturbative definition of the `potential subtracted' mass. The short distance expansion of the static potential is derived, taking into account an hypothetical short distance linear term. The magnitude of the standard OPE contributions are estimated in quenched QCD, based on results of Luscher and Weisz. It is observed that the expansion is not yet reliable at the shortest distances presently measured on the lattice. |
2001.08273 | Xin-Nian Wang | Yayun He, Long-Gang Pang and Xin-Nian Wang | Gradient Tomography of Jet Quenching in Heavy-Ion Collisions | 5 pages in RevTex with 4 figures, final published version in PRL | Phys. Rev. Lett. 125, 122301 (2020) | 10.1103/PhysRevLett.125.122301 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Transverse momentum broadening and energy loss of a propagating parton are
dictated by the space-time profile of the jet transport coefficient $\hat q$ in
a dense QCD medium. The spatial gradient of $\hat q$ perpendicular to the
propagation direction can lead to a drift and asymmetry in parton transverse
momentum distribution. Such an asymmetry depends on both the spatial position
along the transverse gradient and path length of a propagating parton as shown
by numerical solutions of the Boltzmann transport in the simplified form of a
drift-diffusion equation. In high-energy heavy-ion collisions, this asymmetry
with respect to a plane defined by the beam and trigger particle (photon,
hadron or jet) with a given orientation relative to the event plane is shown to
be closely related to the transverse position of the initial jet production in
full event-by-event simulations within the linear Boltzmann transport model.
Such a gradient tomography can be used to localize the initial jet production
position for more detailed study of jet quenching and properties of the
quark-gluon plasma along a given propagation path in heavy-ion collisions.
| [
{
"created": "Wed, 22 Jan 2020 20:45:44 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Sep 2020 23:01:18 GMT",
"version": "v2"
}
] | 2020-09-23 | [
[
"He",
"Yayun",
""
],
[
"Pang",
"Long-Gang",
""
],
[
"Wang",
"Xin-Nian",
""
]
] | Transverse momentum broadening and energy loss of a propagating parton are dictated by the space-time profile of the jet transport coefficient $\hat q$ in a dense QCD medium. The spatial gradient of $\hat q$ perpendicular to the propagation direction can lead to a drift and asymmetry in parton transverse momentum distribution. Such an asymmetry depends on both the spatial position along the transverse gradient and path length of a propagating parton as shown by numerical solutions of the Boltzmann transport in the simplified form of a drift-diffusion equation. In high-energy heavy-ion collisions, this asymmetry with respect to a plane defined by the beam and trigger particle (photon, hadron or jet) with a given orientation relative to the event plane is shown to be closely related to the transverse position of the initial jet production in full event-by-event simulations within the linear Boltzmann transport model. Such a gradient tomography can be used to localize the initial jet production position for more detailed study of jet quenching and properties of the quark-gluon plasma along a given propagation path in heavy-ion collisions. |
0807.3349 | Benjamin Koch | Benjamin Koch, Marcus Bleicher, and Horst Stoecker | Exclusion of black hole disaster scenarios at the LHC | 17 pages, 2 figures | Phys.Lett.B672:71-76,2009 | 10.1016/j.physletb.2009.01.003 | null | hep-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The upcoming high energy experiments at the LHC are one of the most
outstanding efforts for a better understanding of nature. It is associated with
great hopes in the physics community. But there is also some fear in the
public, that the conjectured production of mini black holes might lead to a
dangerous chain reaction. In this paper we summarize the most straight forward
arguments that are necessary to rule out such doomsday scenarios.
| [
{
"created": "Tue, 22 Jul 2008 17:40:24 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Sep 2008 18:23:38 GMT",
"version": "v2"
}
] | 2009-09-29 | [
[
"Koch",
"Benjamin",
""
],
[
"Bleicher",
"Marcus",
""
],
[
"Stoecker",
"Horst",
""
]
] | The upcoming high energy experiments at the LHC are one of the most outstanding efforts for a better understanding of nature. It is associated with great hopes in the physics community. But there is also some fear in the public, that the conjectured production of mini black holes might lead to a dangerous chain reaction. In this paper we summarize the most straight forward arguments that are necessary to rule out such doomsday scenarios. |
1203.5006 | Pasquini Barbara | B. Pasquini (Pavia U. and INFN, Pavia) and C. Lorce' (IPN and LPT,
Orsay) | Models for TMDs and numerical methods | 43 pages, 8 figures; proceedings of International School of Physics
"Enrico Fermi", Course CLXXX - "Three-dimensional Partonic Structure of the
Nucleon", 28 June - 8 July 2011, Varenna (Italy) | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the connection between the quark orbital angular momentum and the
pretzelosity transverse-momentum dependent parton distribution function. We
discuss the origin of this relation in quark models, identifying as key
ingredient for its validity the assumption of spherical symmetry for the
nucleon in its rest frame. Finally we show that the individual quark
contributions to the orbital angular momentum obtained from this relation can
not be interpreted as the intrinsic contributions, but include the contribution
from the transverse centre of momentum which cancels out only in the total
orbital angular momentum.
| [
{
"created": "Thu, 22 Mar 2012 14:35:38 GMT",
"version": "v1"
}
] | 2012-03-23 | [
[
"Pasquini",
"B.",
"",
"Pavia U. and INFN, Pavia"
],
[
"Lorce'",
"C.",
"",
"IPN and LPT,\n Orsay"
]
] | We study the connection between the quark orbital angular momentum and the pretzelosity transverse-momentum dependent parton distribution function. We discuss the origin of this relation in quark models, identifying as key ingredient for its validity the assumption of spherical symmetry for the nucleon in its rest frame. Finally we show that the individual quark contributions to the orbital angular momentum obtained from this relation can not be interpreted as the intrinsic contributions, but include the contribution from the transverse centre of momentum which cancels out only in the total orbital angular momentum. |
0804.4604 | Tom\'a\v{s} Brauner | Jens O. Andersen and Tomas Brauner | Linear sigma model at finite density in the 1/N expansion to
next-to-leading order | 12 pages, REVTeX4, 6 eps figures; v2: added references + minor
corrections throughout the text; version to appear in Phys. Rev. D | Phys.Rev.D78:014030,2008 | 10.1103/PhysRevD.78.014030 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study relativistic Bose-Einstein condensation at finite density and
temperature using the linear sigma model in the one-particle-irreducible
1/N-expansion. We derive the effective potential to next-to-leading (NLO) order
and show that it can be renormalized in a temperature-independent manner. As a
particular application, we study the thermodynamics of the pion gas in the
chiral limit as well as with explicit symmetry breaking. At nonzero temperature
we solve the NLO gap equation and show that the results describe the
chiral-symmetry-restoring second-order phase transition in agreement with
general universality arguments. However, due to nontrivial regularization
issues, we are not able to extend the NLO analysis to nonzero chemical
potential.
| [
{
"created": "Tue, 29 Apr 2008 13:02:08 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Jun 2008 07:28:56 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Andersen",
"Jens O.",
""
],
[
"Brauner",
"Tomas",
""
]
] | We study relativistic Bose-Einstein condensation at finite density and temperature using the linear sigma model in the one-particle-irreducible 1/N-expansion. We derive the effective potential to next-to-leading (NLO) order and show that it can be renormalized in a temperature-independent manner. As a particular application, we study the thermodynamics of the pion gas in the chiral limit as well as with explicit symmetry breaking. At nonzero temperature we solve the NLO gap equation and show that the results describe the chiral-symmetry-restoring second-order phase transition in agreement with general universality arguments. However, due to nontrivial regularization issues, we are not able to extend the NLO analysis to nonzero chemical potential. |
hep-ph/9303231 | My Account | J. Lopez, D. Nanopoulos, H. Pois, X. Wang, and A. Zichichi | Sparticle and Higgs Production and Detection at LEPII in two
Supergravity Models | 20 pages plus 13 postscript figures (included); CTP-TAMU-89/92,
CERN-PPE/93-16 | Phys.Rev.D48:4062-4075,1993 | 10.1103/PhysRevD.48.4062 | null | hep-ph | null | We study the most promising signals for supersymmetry at LEPII in the context
of two well motivated supergravity models: (i) the minimal $SU(5)$ supergravity
model including the stringent constraints from proton stability and a not too
young Universe, and (ii) a recently proposed string-inspired no-scale flipped
$SU(5)$ supergravity model. Our computations span the neutralino, chargino,
slepton, and Higgs sectors together with their interconnections in this class
of models. We find that the number of `mixed' (1-lepton + 2-jets + $\slash{p}$)
events occuring in the decay of pair-produced charginos ($\chi^\pm_1$) is quite
significant (per ${\cal L}=100\ipb$) for both models and that these predictions
do not overlap. That is, if $m_{\chi^\pm_1}<100\GeV$ then LEPII should be able
to exclude at least one of the two models. In the no-scale flipped $SU(5)$
model we find that the number of acoplanar di-electron events from selectron
pair production should allow for exploration of selectron masses up to the
kinematical limit and chargino masses indirectly as high as 150 GeV. We find
that the cross section $e^+e^-\to Z^*h$ deviates negligibly from the SM result
in the minimal model, whereas it can be as much as $1/3$ lower in the flipped
model. The usually neglected invisible mode $h\to\chi^0_1\chi^0_1$ can erode
the preferred $h\to 2\,{\rm jets}$ signal by as much as $40\%$ in these models.
We conclude that the charged slepton sector is a deeper probe than the
chargino/neutralino or Higgs sectors of the flipped $SU(5)$ model at LEPII,
while the opposite is true for the minimal $SU(5)$ model where the slepton
sector is no probe at all.
| [
{
"created": "Mon, 8 Mar 1993 22:41:56 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Lopez",
"J.",
""
],
[
"Nanopoulos",
"D.",
""
],
[
"Pois",
"H.",
""
],
[
"Wang",
"X.",
""
],
[
"Zichichi",
"A.",
""
]
] | We study the most promising signals for supersymmetry at LEPII in the context of two well motivated supergravity models: (i) the minimal $SU(5)$ supergravity model including the stringent constraints from proton stability and a not too young Universe, and (ii) a recently proposed string-inspired no-scale flipped $SU(5)$ supergravity model. Our computations span the neutralino, chargino, slepton, and Higgs sectors together with their interconnections in this class of models. We find that the number of `mixed' (1-lepton + 2-jets + $\slash{p}$) events occuring in the decay of pair-produced charginos ($\chi^\pm_1$) is quite significant (per ${\cal L}=100\ipb$) for both models and that these predictions do not overlap. That is, if $m_{\chi^\pm_1}<100\GeV$ then LEPII should be able to exclude at least one of the two models. In the no-scale flipped $SU(5)$ model we find that the number of acoplanar di-electron events from selectron pair production should allow for exploration of selectron masses up to the kinematical limit and chargino masses indirectly as high as 150 GeV. We find that the cross section $e^+e^-\to Z^*h$ deviates negligibly from the SM result in the minimal model, whereas it can be as much as $1/3$ lower in the flipped model. The usually neglected invisible mode $h\to\chi^0_1\chi^0_1$ can erode the preferred $h\to 2\,{\rm jets}$ signal by as much as $40\%$ in these models. We conclude that the charged slepton sector is a deeper probe than the chargino/neutralino or Higgs sectors of the flipped $SU(5)$ model at LEPII, while the opposite is true for the minimal $SU(5)$ model where the slepton sector is no probe at all. |
1603.06682 | C. Q. Geng | C.Q. Geng, Y.K. Hsiao, Yu-Heng Lin, and Yao Yu | Study of $\Lambda_b\to \Lambda (\phi,\eta^{(\prime)})$ and $\Lambda_b\to
\Lambda K^+K^-$ decays | 8 pages, 1 figure, revised version accepted by EPJC | null | 10.1140/epjc/s10052-016-4255-x | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the charmless two-body $\Lambda_b\to \Lambda (\phi,\eta^{(\prime)})$
and three-body $\Lambda_b\to \Lambda K^+K^- $ decays. We obtain ${\cal
B}(\Lambda_b\to \Lambda\phi)=(3.53\pm 0.24)\times 10^{-6}$ to agree with the
recent LHCb measurement. However, we find that ${\cal B}(\Lambda_b\to
\Lambda(\phi\to)K^+ K^-)=(1.71\pm 0.12)\times 10^{-6}$ is unable to explain the
LHCb observation of ${\cal B}(\Lambda_b\to\Lambda K^+ K^-)=(15.9\pm 1.2\pm
1.2\pm 2.0)\times 10^{-6}$, which implies the possibility for other
contributions, such as that from the resonant $\Lambda_b\to K^-
N^*,\,N^*\to\Lambda K^+$ decay with $N^*$ as a higher-wave baryon state. For
$\Lambda_b\to \Lambda \eta^{(\prime)}$, we show that ${\cal B}(\Lambda_b\to
\Lambda\eta,\,\Lambda\eta^\prime)= (1.47\pm 0.35,1.83\pm 0.58)\times 10^{-6}$,
which are consistent with the current data of $(9.3^{+7.3}_{-5.3},<3.1)\times
10^{-6}$, respectively. Our results also support the relation of ${\cal
B}(\Lambda_b\to \Lambda\eta) \simeq {\cal B}(\Lambda_b\to\Lambda\eta^\prime)$,
given by the previous study.
| [
{
"created": "Tue, 22 Mar 2016 06:43:58 GMT",
"version": "v1"
},
{
"created": "Sat, 9 Jul 2016 03:30:45 GMT",
"version": "v2"
}
] | 2016-08-24 | [
[
"Geng",
"C. Q.",
""
],
[
"Hsiao",
"Y. K.",
""
],
[
"Lin",
"Yu-Heng",
""
],
[
"Yu",
"Yao",
""
]
] | We study the charmless two-body $\Lambda_b\to \Lambda (\phi,\eta^{(\prime)})$ and three-body $\Lambda_b\to \Lambda K^+K^- $ decays. We obtain ${\cal B}(\Lambda_b\to \Lambda\phi)=(3.53\pm 0.24)\times 10^{-6}$ to agree with the recent LHCb measurement. However, we find that ${\cal B}(\Lambda_b\to \Lambda(\phi\to)K^+ K^-)=(1.71\pm 0.12)\times 10^{-6}$ is unable to explain the LHCb observation of ${\cal B}(\Lambda_b\to\Lambda K^+ K^-)=(15.9\pm 1.2\pm 1.2\pm 2.0)\times 10^{-6}$, which implies the possibility for other contributions, such as that from the resonant $\Lambda_b\to K^- N^*,\,N^*\to\Lambda K^+$ decay with $N^*$ as a higher-wave baryon state. For $\Lambda_b\to \Lambda \eta^{(\prime)}$, we show that ${\cal B}(\Lambda_b\to \Lambda\eta,\,\Lambda\eta^\prime)= (1.47\pm 0.35,1.83\pm 0.58)\times 10^{-6}$, which are consistent with the current data of $(9.3^{+7.3}_{-5.3},<3.1)\times 10^{-6}$, respectively. Our results also support the relation of ${\cal B}(\Lambda_b\to \Lambda\eta) \simeq {\cal B}(\Lambda_b\to\Lambda\eta^\prime)$, given by the previous study. |
2403.04030 | Paulo Areyuna C. | Paulo Areyuna C. and Jilberto Zamora-Saa and Alfonso R. Zerwekh | Fermion Dark Matter in the Vector Scotogenic Model: A Survey of
Signatures | 25 pages, 13 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we have studied the Vector Scotogenic Model in the context of
the Dark Matter problem. Due to unitarity considerations, we have focused on
the scenario with fermion dark matter, finding out that co-annihilations play a
fundamental role in achieving dark matter relic abundance. Moreover, the
coannihilation effects allow to separate the parameter space into two regions
with different phenomenology. In addition, we have studied the detection
prospects of these regions separately, focusing on signatures that can appear
in lepton flavor violating decays, indirect and direct searches, and the
production of these new particles at collider facilities.
| [
{
"created": "Wed, 6 Mar 2024 20:20:19 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Apr 2024 13:56:16 GMT",
"version": "v2"
},
{
"created": "Fri, 28 Jun 2024 15:38:18 GMT",
"version": "v3"
}
] | 2024-07-01 | [
[
"C.",
"Paulo Areyuna",
""
],
[
"Zamora-Saa",
"Jilberto",
""
],
[
"Zerwekh",
"Alfonso R.",
""
]
] | In this work, we have studied the Vector Scotogenic Model in the context of the Dark Matter problem. Due to unitarity considerations, we have focused on the scenario with fermion dark matter, finding out that co-annihilations play a fundamental role in achieving dark matter relic abundance. Moreover, the coannihilation effects allow to separate the parameter space into two regions with different phenomenology. In addition, we have studied the detection prospects of these regions separately, focusing on signatures that can appear in lepton flavor violating decays, indirect and direct searches, and the production of these new particles at collider facilities. |
1804.03083 | Igor Ivanov | Igor P. Ivanov, Maxim Laletin | Multi-Higgs models with CP symmetries of increasingly high order | 13 pages; v2: extra comments and references; v3: extra
clarifications, matches published version | Phys. Rev. D 98, 015021 (2018) | 10.1103/PhysRevD.98.015021 | CFTP/18-007 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When building CP-symmetric models beyond the Standard Model, one can impose
CP-symmetry of higher order. This means that one needs to apply the
CP-transformation more than two times to get the identity transformation, but
still the model is perfectly CP-conserving. A multi-Higgs-doublet model based
on CP-symmetry of order 4, dubbed CP4, was recently proposed and its
phenomenology is being explored. Here, we show that the construction does not
stop at CP4. We build examples of renormalizable multi-Higgs-doublet potentials
which are symmetric under CP8 or CP16, without leading to any accidental
symmetry. If the vacuum conserves CP-symmetry of order 2k, then the neutral
scalars become CP-eigenstates, which are characterized not by CP-parities but
by CP-charges defined modulo 2k. One or more lightest states can be the dark
matter candidates, which are protected against decay not by the internal
symmetry but by the exotic CP. We briefly discuss their mass spectra and
interaction patterns for CP8 and CP16.
| [
{
"created": "Mon, 9 Apr 2018 16:18:45 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Apr 2018 11:11:09 GMT",
"version": "v2"
},
{
"created": "Thu, 9 Aug 2018 20:23:26 GMT",
"version": "v3"
}
] | 2018-08-13 | [
[
"Ivanov",
"Igor P.",
""
],
[
"Laletin",
"Maxim",
""
]
] | When building CP-symmetric models beyond the Standard Model, one can impose CP-symmetry of higher order. This means that one needs to apply the CP-transformation more than two times to get the identity transformation, but still the model is perfectly CP-conserving. A multi-Higgs-doublet model based on CP-symmetry of order 4, dubbed CP4, was recently proposed and its phenomenology is being explored. Here, we show that the construction does not stop at CP4. We build examples of renormalizable multi-Higgs-doublet potentials which are symmetric under CP8 or CP16, without leading to any accidental symmetry. If the vacuum conserves CP-symmetry of order 2k, then the neutral scalars become CP-eigenstates, which are characterized not by CP-parities but by CP-charges defined modulo 2k. One or more lightest states can be the dark matter candidates, which are protected against decay not by the internal symmetry but by the exotic CP. We briefly discuss their mass spectra and interaction patterns for CP8 and CP16. |
1701.06335 | Taras Zagoskin | Taras V. Zagoskin, Alexander Yu. Korchin | The Higgs boson decay into ZZ decaying to identical fermion pairs | 27 pages, 6 figures, version accepted to Int. J. Mod. Phys. A | Int. J. Mod. Phys. A 32, no. 27, 1750166 (2017) | 10.1142/S0217751X17501664 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In order to investigate various decay channels of the Higgs boson $h$ or the
hypothetical dilaton, we consider a neutral particle $X$ with zero spin and
arbitrary $CP$ parity. This particle can decay into two off-mass-shell $Z$
bosons ($Z_1^*$ and $Z_2^*$) decaying to identical fermion-antifermion pairs
($f \bar{f}$): $X \to Z_1^* Z_2^* \to f \bar{f} f \bar{f}$. We derive
analytical formulas for the fully differential width of this decay and for the
fully differential width of $h \to Z_1^* Z_2^* \to 4 \ell$ ($4 \ell$ stands for
$4 e$, $4 \mu$, or $2 e 2 \mu$). Integration of these formulas yields some
Standard Model histogram distributions of the decay $h \to Z_1^* Z_2^* \to 4
\ell$, which are compared with corresponding Monte Carlo simulated
distributions obtained by ATLAS and with ATLAS experimental data.
| [
{
"created": "Mon, 23 Jan 2017 11:19:58 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Apr 2018 13:46:32 GMT",
"version": "v2"
}
] | 2018-04-12 | [
[
"Zagoskin",
"Taras V.",
""
],
[
"Korchin",
"Alexander Yu.",
""
]
] | In order to investigate various decay channels of the Higgs boson $h$ or the hypothetical dilaton, we consider a neutral particle $X$ with zero spin and arbitrary $CP$ parity. This particle can decay into two off-mass-shell $Z$ bosons ($Z_1^*$ and $Z_2^*$) decaying to identical fermion-antifermion pairs ($f \bar{f}$): $X \to Z_1^* Z_2^* \to f \bar{f} f \bar{f}$. We derive analytical formulas for the fully differential width of this decay and for the fully differential width of $h \to Z_1^* Z_2^* \to 4 \ell$ ($4 \ell$ stands for $4 e$, $4 \mu$, or $2 e 2 \mu$). Integration of these formulas yields some Standard Model histogram distributions of the decay $h \to Z_1^* Z_2^* \to 4 \ell$, which are compared with corresponding Monte Carlo simulated distributions obtained by ATLAS and with ATLAS experimental data. |
hep-ph/9405428 | null | R. Barbieri, Z. Berezhiani, G. Dvali, L. Hall and A. Strumia | Flavour in supersymmetric Grand Unification: a democratic approach | 14 pages, 4 figures in LaTeX, IFUP -- TH. 7/94 | Nucl.Phys.B432:49-67,1994 | 10.1016/0550-3213(94)90593-2 | null | hep-ph | null | We consider the flavour problem in a supersymmetric Grand Unified theory with
gauged SU(6) group, where the Higgs doublets are understood as pseudo-Goldstone
bosons of a larger $\SU(6)\otimes\SU(6)$ global symmetry of the Higgs
superpotential. A key element of this work is that we never appeal to any
flavour symmetry. One main interesting feature emerges: only one of the light
fermions, an up-type quark, to be identified with the top, can get a Yukawa
coupling at renormalizable level. This fact, together with bottom-tau Yukawa
unification, also implied in our scheme, gives rise to a characteristic
correlation between the top and the Higgs mass. By including a flavour-blind
discrete symmetry and requiring that all higher dimensional operators be
mediated by the exchange of appropriate heavy multiplets, it is possible to
give an approximate description of all masses and mixing angles in term of a
hierarchy of grand unified scales. A special ``texture'' arises, implying a
relation between the top mass and the third generation mixing angles. Several
other possible consequences of this approach are pointed out, concerning the
$\mu/s$ mass ratio, the Cabibbo angle and the proton decay.
| [
{
"created": "Tue, 31 May 1994 17:05:26 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Jun 1994 14:20:41 GMT",
"version": "v2"
},
{
"created": "Fri, 10 Jun 1994 16:54:50 GMT",
"version": "v3"
}
] | 2009-10-09 | [
[
"Barbieri",
"R.",
""
],
[
"Berezhiani",
"Z.",
""
],
[
"Dvali",
"G.",
""
],
[
"Hall",
"L.",
""
],
[
"Strumia",
"A.",
""
]
] | We consider the flavour problem in a supersymmetric Grand Unified theory with gauged SU(6) group, where the Higgs doublets are understood as pseudo-Goldstone bosons of a larger $\SU(6)\otimes\SU(6)$ global symmetry of the Higgs superpotential. A key element of this work is that we never appeal to any flavour symmetry. One main interesting feature emerges: only one of the light fermions, an up-type quark, to be identified with the top, can get a Yukawa coupling at renormalizable level. This fact, together with bottom-tau Yukawa unification, also implied in our scheme, gives rise to a characteristic correlation between the top and the Higgs mass. By including a flavour-blind discrete symmetry and requiring that all higher dimensional operators be mediated by the exchange of appropriate heavy multiplets, it is possible to give an approximate description of all masses and mixing angles in term of a hierarchy of grand unified scales. A special ``texture'' arises, implying a relation between the top mass and the third generation mixing angles. Several other possible consequences of this approach are pointed out, concerning the $\mu/s$ mass ratio, the Cabibbo angle and the proton decay. |
1302.0035 | Erike Cazaroto Ph.D. | E.R. Cazaroto, V.P. Goncalves, F.S. Navarra and M. Nielsen | On the energy dependence of the D^+/D^- production asymmetry | 8 pages, 8 figures. arXiv admin note: text overlap with
arXiv:hep-ph/0009276 | Physics Letters B 724 (2013) 108 | 10.1016/j.physletb.2013.06.017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we discuss the origin of the asymmetry present in D meson
production and its energy dependence. In particular, we have applied the meson
cloud model to calculate the asymmetries in D^-/D^+ meson production in high
energy p-p collisions and find a good agreement with recent LHCb data. Although
small, this non-vanishing asymmetry may shed light on the role played by the
charm meson cloud of the proton.
| [
{
"created": "Thu, 31 Jan 2013 23:06:07 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jul 2013 18:30:52 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Cazaroto",
"E. R.",
""
],
[
"Goncalves",
"V. P.",
""
],
[
"Navarra",
"F. S.",
""
],
[
"Nielsen",
"M.",
""
]
] | In this paper we discuss the origin of the asymmetry present in D meson production and its energy dependence. In particular, we have applied the meson cloud model to calculate the asymmetries in D^-/D^+ meson production in high energy p-p collisions and find a good agreement with recent LHCb data. Although small, this non-vanishing asymmetry may shed light on the role played by the charm meson cloud of the proton. |
0707.0343 | Archil Kobakhidze | Archil Kobakhidze and Bruce H. J. McKellar | Particle interference as a test of Lorentz-violating electrodynamics | 5 pages | Phys.Rev.D76:093004,2007 | 10.1103/PhysRevD.76.093004 | null | hep-ph quant-ph | null | In Lorentz-violating electrodynamics a steady current (and similarly a static
charge) generates both static magnetic and electric fields. These induced
fields, acting on interfering particles, change the interference pattern. We
find that particle interference experiments are sensitive to small Lorentz
violating effects, and thus they can be used to improve current bounds on some
Lorentz-violating parameters.
| [
{
"created": "Tue, 3 Jul 2007 07:06:18 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kobakhidze",
"Archil",
""
],
[
"McKellar",
"Bruce H. J.",
""
]
] | In Lorentz-violating electrodynamics a steady current (and similarly a static charge) generates both static magnetic and electric fields. These induced fields, acting on interfering particles, change the interference pattern. We find that particle interference experiments are sensitive to small Lorentz violating effects, and thus they can be used to improve current bounds on some Lorentz-violating parameters. |
hep-ph/0508311 | Kazuhiro Tobe | Qing-Hong Cao, Daisuke Nomura, Kazuhiro Tobe, C.-P. Yuan | Enhancement of "CP-odd" Higgs Boson Production in the Minimal
Supersymmetric Standard Model with Explicit CP Violation | 13 pages, 3 figures | Phys.Lett.B632:688-694,2006 | 10.1016/j.physletb.2005.11.023 | MSUHEP-050715 | hep-ph | null | We calculate the production cross section of the ``CP-odd'' Higgs boson via
gluon fusion in the minimal supersymmetric standard model with explicit CP
violation in the stop sector. We show that there is a parameter region in which
the cross section is enhanced by a factor of about 1000, as compared to the
case without CP violation in the stop sector. In the parameter region where the
``CP-odd'' Higgs boson can decay into a stop pair, the stop pair events will be
the important signature of the enhanced ``CP-odd'' Higgs boson. In the case
where the ``CP-odd'' Higgs boson cannot decay into any superparticles, the
gamma gamma and tau tau decay channels could become important for discovering
the ``CP-odd'' Higgs boson. We also discuss the constraints from electric
dipole moments of electron, neutron and mercury on the viable parameter space
mentioned above.
| [
{
"created": "Tue, 30 Aug 2005 18:01:51 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Cao",
"Qing-Hong",
""
],
[
"Nomura",
"Daisuke",
""
],
[
"Tobe",
"Kazuhiro",
""
],
[
"Yuan",
"C. -P.",
""
]
] | We calculate the production cross section of the ``CP-odd'' Higgs boson via gluon fusion in the minimal supersymmetric standard model with explicit CP violation in the stop sector. We show that there is a parameter region in which the cross section is enhanced by a factor of about 1000, as compared to the case without CP violation in the stop sector. In the parameter region where the ``CP-odd'' Higgs boson can decay into a stop pair, the stop pair events will be the important signature of the enhanced ``CP-odd'' Higgs boson. In the case where the ``CP-odd'' Higgs boson cannot decay into any superparticles, the gamma gamma and tau tau decay channels could become important for discovering the ``CP-odd'' Higgs boson. We also discuss the constraints from electric dipole moments of electron, neutron and mercury on the viable parameter space mentioned above. |
2206.14748 | Siavash Neshatpour | G. D'Ambrosio, A.M. Iyer, F. Mahmoudi, S. Neshatpour | Anatomy of kaon decays and prospects for lepton flavour universality
violation | 32 pages, 14 figures. v2: references added | JHEP 09 (2022) 148 | 10.1007/JHEP09(2022)148 | CERN-TH-2022-101 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The kaon sector is characterised by several processes which are under active
investigation across different experiments. In this work, we present the global
picture that emerges from a study of the different decay modes. We begin by
revisiting the theoretical component of these decays and providing up-to-date
predictions of the Standard Model as well as the corresponding uncertainties.
Several new features emerge, in particular for $K_{S,L}\to \mu\bar\mu$, and are
presented in considerable detail. This offers an ideal platform for extracting
the parameter space supported by the existing data. Motivated by possible
lepton flavour universality violation in $B$ decays, we investigate such Beyond
the Standard Model effects also in rare kaon decays. Without loss of
generality, our primary analyses correspond to the paradigm where the Wilson
coefficients for operators involving tau leptons are chosen to be equal to that
involving the muon, i.e. $\delta C^\tau=\delta C^\mu$. We conclude by
presenting the possible picture that can be achieved towards the end of the run
of data accumulation in the planned experiments. This includes assumptions on
possible sensitivity goals that the experiments can aim to achieve, in order to
extract the kind of physics highlighted in this paper.
| [
{
"created": "Wed, 29 Jun 2022 16:23:08 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Sep 2022 17:54:33 GMT",
"version": "v2"
}
] | 2022-09-27 | [
[
"D'Ambrosio",
"G.",
""
],
[
"Iyer",
"A. M.",
""
],
[
"Mahmoudi",
"F.",
""
],
[
"Neshatpour",
"S.",
""
]
] | The kaon sector is characterised by several processes which are under active investigation across different experiments. In this work, we present the global picture that emerges from a study of the different decay modes. We begin by revisiting the theoretical component of these decays and providing up-to-date predictions of the Standard Model as well as the corresponding uncertainties. Several new features emerge, in particular for $K_{S,L}\to \mu\bar\mu$, and are presented in considerable detail. This offers an ideal platform for extracting the parameter space supported by the existing data. Motivated by possible lepton flavour universality violation in $B$ decays, we investigate such Beyond the Standard Model effects also in rare kaon decays. Without loss of generality, our primary analyses correspond to the paradigm where the Wilson coefficients for operators involving tau leptons are chosen to be equal to that involving the muon, i.e. $\delta C^\tau=\delta C^\mu$. We conclude by presenting the possible picture that can be achieved towards the end of the run of data accumulation in the planned experiments. This includes assumptions on possible sensitivity goals that the experiments can aim to achieve, in order to extract the kind of physics highlighted in this paper. |
0905.1944 | Frank X. Lee | Lai Wang and Frank X. Lee | N to $\Delta$ transition amplitudes from QCD sum rules | 18 pages, 8 figures, 7 tables. Updated references and Fig. 7 and Fig.
8 | Phys.Rev.D80:034003,2009 | 10.1103/PhysRevD.80.034003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a calculation of the N to $\Delta$ electromagnetic transition
amplitudes using the method of QCD sum rules. A complete set of QCD sum rules
are derived for the entire family of transitions from the baryon octet to
decuplet. They are analyzed in conjunction with the corresponding mass sum
rules using a Monte-Carlo-based analysis procedure. The performance of each of
the sum rules is examined using the criteria of OPE convergence and
ground-state dominance, along with the role of the transitions in intermediate
states. Individual contributions from the u, d and s quarks are isolated and
their implications in the underlying dynamics are explored. Valid sum rules are
identified and their predictions are obtained. The results are compared with
experiment and other calculations.
| [
{
"created": "Tue, 12 May 2009 19:47:02 GMT",
"version": "v1"
},
{
"created": "Wed, 20 May 2009 00:51:03 GMT",
"version": "v2"
}
] | 2009-09-02 | [
[
"Wang",
"Lai",
""
],
[
"Lee",
"Frank X.",
""
]
] | We present a calculation of the N to $\Delta$ electromagnetic transition amplitudes using the method of QCD sum rules. A complete set of QCD sum rules are derived for the entire family of transitions from the baryon octet to decuplet. They are analyzed in conjunction with the corresponding mass sum rules using a Monte-Carlo-based analysis procedure. The performance of each of the sum rules is examined using the criteria of OPE convergence and ground-state dominance, along with the role of the transitions in intermediate states. Individual contributions from the u, d and s quarks are isolated and their implications in the underlying dynamics are explored. Valid sum rules are identified and their predictions are obtained. The results are compared with experiment and other calculations. |
hep-ph/0410248 | David Temes | M. Krawczyk and D. Temes | Large 2HDM(II) one-loop corrections in leptonic tau decays | 25 pgs. Figures and their descriptions improved, references added | Eur.Phys.J.C44:435-446,2005 | 10.1140/epjc/s2005-02370-2 | LAPTH-1075/04; IFT-2004-28 | hep-ph | null | The one-loop contributions to the branching ratios for leptonic tau decays
are calculated in the CP conserving 2HDM(II). We found that these one-loop
contributions, involving both neutral and charged Higgs bosons, dominate over
the tree-level H^+ exchange, the latter one being totally negligible for the
decay into electron. The analysis is focused on large tanbeta enhanced
contributions to the considered branching ratios. We derive a simple analytical
expression for the one-loop contribution which holds in this case. We show that
the leptonic branching ratios of tau are complementary to the Higgsstrahlung
processes for h(H) and have a large potential on constraining parameters of the
model. In this work we provide upper limits on Yukawa couplings for both light
h and light A scenarios and we derive new lower limit on mass of M_{H^+} as a
function of tanbeta, which differs significantly from what was considered as
standard constraint based on the tree-level H^{+} exchange only. Interestingly
we obtain also an upper limit on M_{H^+}. For a SM-like h scenario, with heavy
and degenerate additional Higgs bosons, one-loop corrections disappear.
| [
{
"created": "Mon, 18 Oct 2004 19:52:47 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Oct 2004 19:45:08 GMT",
"version": "v2"
},
{
"created": "Mon, 31 Jan 2005 20:38:48 GMT",
"version": "v3"
}
] | 2009-01-07 | [
[
"Krawczyk",
"M.",
""
],
[
"Temes",
"D.",
""
]
] | The one-loop contributions to the branching ratios for leptonic tau decays are calculated in the CP conserving 2HDM(II). We found that these one-loop contributions, involving both neutral and charged Higgs bosons, dominate over the tree-level H^+ exchange, the latter one being totally negligible for the decay into electron. The analysis is focused on large tanbeta enhanced contributions to the considered branching ratios. We derive a simple analytical expression for the one-loop contribution which holds in this case. We show that the leptonic branching ratios of tau are complementary to the Higgsstrahlung processes for h(H) and have a large potential on constraining parameters of the model. In this work we provide upper limits on Yukawa couplings for both light h and light A scenarios and we derive new lower limit on mass of M_{H^+} as a function of tanbeta, which differs significantly from what was considered as standard constraint based on the tree-level H^{+} exchange only. Interestingly we obtain also an upper limit on M_{H^+}. For a SM-like h scenario, with heavy and degenerate additional Higgs bosons, one-loop corrections disappear. |
hep-ph/0210356 | Anna Lipniacka | Anna Lipniacka (University of Stockholm, Fysikum, AlbaNova Center for
Physics, Astronomy and Biotechnology) | Understanding SUSY limits from LEP | Prepared for 3nd International Conference on Physics Beyond the
Standard Model, Beyond the Desert 02, Oulu, Finland, 2-7 June 2002 | null | null | USIP-2/2002 | hep-ph | null | LEP results have constrained heavily the Minimal Supersymmetric Standard
Model, while providing hints for light Higgs boson and for ``SUSY-assisted''
gauge couling unification. In this paper the results obtained at LEP within two
scenarios, the gravity-mediated MSSM framework and the minimal SUGRA scenario
are presented. Model-dependence and coverage of LEP results is discussed.
| [
{
"created": "Fri, 25 Oct 2002 16:20:25 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lipniacka",
"Anna",
"",
"University of Stockholm, Fysikum, AlbaNova Center for\n Physics, Astronomy and Biotechnology"
]
] | LEP results have constrained heavily the Minimal Supersymmetric Standard Model, while providing hints for light Higgs boson and for ``SUSY-assisted'' gauge couling unification. In this paper the results obtained at LEP within two scenarios, the gravity-mediated MSSM framework and the minimal SUGRA scenario are presented. Model-dependence and coverage of LEP results is discussed. |
1811.09637 | Fredrik Bj\"orkeroth | Fredrik Bj\"orkeroth, Luca Di Luzio, Federico Mescia, Enrico Nardi | $U(1)$ flavour symmetries as Peccei-Quinn symmetries | v2: version accepted for publication in JHEP; figure 1 updated; minor
additions; 23 pages, 1 figure. v1: 20 pages, 1 figure | null | 10.1007/JHEP02(2019)133 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate to what extent a generic, generation-dependent $U(1)$ symmetry
acting on the quark Yukawa operators can reduce the number of free parameters
by forcing some entries in the Yukawa matrices to vanish. The maximal reduction
compatible with CP violation yields nine real parameters and one phase, which
matches the number of physical observables, implying that such models have no
free parameters. We derive a set of results: (i) the only possible structures
have the form $M_4 \oplus M_5$, where the subscripts indicate the number of
real parameters in the Yukawa matrices, (ii) there are only two inequivalent
Yukawa structures, each one giving rise to six different models depending on
quark flavour assignments, (iii) the $U(1)$ symmetries that generate these
textures all have a QCD anomaly, and hence are Peccei-Quinn symmetries,
reinforcing the idea of a possible connection between the quark flavour puzzle
and the axion solution to the strong CP problem, (iv) in some cases the
contributions to the QCD anomaly of two generations cancels out, and this opens
the possibility that the axion coupling to nucleons could be strongly
suppressed. Flavour-violating axion couplings to quarks are completely fixed,
up to the axion decay constant, providing a non-trivial complementarity between
low-energy flavour-violating processes and standard axion searches.
| [
{
"created": "Fri, 23 Nov 2018 19:00:05 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Feb 2019 14:42:16 GMT",
"version": "v2"
}
] | 2019-03-27 | [
[
"Björkeroth",
"Fredrik",
""
],
[
"Di Luzio",
"Luca",
""
],
[
"Mescia",
"Federico",
""
],
[
"Nardi",
"Enrico",
""
]
] | We investigate to what extent a generic, generation-dependent $U(1)$ symmetry acting on the quark Yukawa operators can reduce the number of free parameters by forcing some entries in the Yukawa matrices to vanish. The maximal reduction compatible with CP violation yields nine real parameters and one phase, which matches the number of physical observables, implying that such models have no free parameters. We derive a set of results: (i) the only possible structures have the form $M_4 \oplus M_5$, where the subscripts indicate the number of real parameters in the Yukawa matrices, (ii) there are only two inequivalent Yukawa structures, each one giving rise to six different models depending on quark flavour assignments, (iii) the $U(1)$ symmetries that generate these textures all have a QCD anomaly, and hence are Peccei-Quinn symmetries, reinforcing the idea of a possible connection between the quark flavour puzzle and the axion solution to the strong CP problem, (iv) in some cases the contributions to the QCD anomaly of two generations cancels out, and this opens the possibility that the axion coupling to nucleons could be strongly suppressed. Flavour-violating axion couplings to quarks are completely fixed, up to the axion decay constant, providing a non-trivial complementarity between low-energy flavour-violating processes and standard axion searches. |
hep-ph/0701109 | Swarup Majee | Swarup Kumar Majee, Mina K. Parida, Amitava Raychaudhuri, Utpal Sarkar | Low Intermediate Scales for Leptogenesis in Supersymmetric SO(10) Grand
Unified Theories | 17 pages, 1 figure, to appear in Phys. Rev D | Phys.Rev.D75:075003,2007 | 10.1103/PhysRevD.75.075003 | CU-PHYSICS-20-2006, HRI-P-06-12-001 | hep-ph | null | A low intermediate scale within minimal supersymmetric SO(10) GUTs is a
desirable feature to accommodate leptogenesis. We explore this possibility in
models where the intermediate gauge symmetry breaks spontaneously by (a)
doublet Higgs scalars and also (b) by triplets. In both scenarios gauge
coupling unification requires the scale of left-right symmetry breaking ($M_R$)
to be close to the unification scale. This will entail unnaturally small
neutrino Yukawa couplings to avoid the gravitino problem and allow successful
leptogenesis. We point out that any one of three options -- threshold
corrections due to the mass spectrum near the unification scale, gravity
induced non-renormalizable operators near the Planck scale, or presence of
additional light Higgs multiplets -- can permit unification along with much
lower values of $M_R$ as required for leptogenesis. In the triplet model,
independent of these corrections, we find a lower bound on the intermediate
scale,
$M_R > 10^9$ GeV, arising from the requirement that the theory must remain
perturbative at least upto the GUT scale. We show that in the doublet model
$M_R$ can even be in the TeV region which, apart from permitting resonant
leptogenesis, can be tested at LHC and ILC.
| [
{
"created": "Mon, 15 Jan 2007 18:13:35 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Mar 2007 12:55:34 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Majee",
"Swarup Kumar",
""
],
[
"Parida",
"Mina K.",
""
],
[
"Raychaudhuri",
"Amitava",
""
],
[
"Sarkar",
"Utpal",
""
]
] | A low intermediate scale within minimal supersymmetric SO(10) GUTs is a desirable feature to accommodate leptogenesis. We explore this possibility in models where the intermediate gauge symmetry breaks spontaneously by (a) doublet Higgs scalars and also (b) by triplets. In both scenarios gauge coupling unification requires the scale of left-right symmetry breaking ($M_R$) to be close to the unification scale. This will entail unnaturally small neutrino Yukawa couplings to avoid the gravitino problem and allow successful leptogenesis. We point out that any one of three options -- threshold corrections due to the mass spectrum near the unification scale, gravity induced non-renormalizable operators near the Planck scale, or presence of additional light Higgs multiplets -- can permit unification along with much lower values of $M_R$ as required for leptogenesis. In the triplet model, independent of these corrections, we find a lower bound on the intermediate scale, $M_R > 10^9$ GeV, arising from the requirement that the theory must remain perturbative at least upto the GUT scale. We show that in the doublet model $M_R$ can even be in the TeV region which, apart from permitting resonant leptogenesis, can be tested at LHC and ILC. |
hep-ph/0306090 | Shi-yuan Li | Feng-lan Shao, Qu-bing Xie, Shi-yuan Li, Qun Wang | Study of color connections in $e^+ e^-$ annihilation | 23 pages, 8 figures, 4 tables, Revtex4 | Phys.Rev. D69 (2004) 054007 | 10.1103/PhysRevD.69.054007 | null | hep-ph | null | We replace in the event generator JETSET the color singlet chain connection
with the color separate state one as the interface between the hard and soft
sectors of hadronic processes. The modified generator is applied to produce the
hadronic events in $e^+ e^-$ annihilation. It describes the experimental data
at the same level as the original JETSET with default parameters. This should
be understood as a demonstration that color singlet chain is not the unique
color connection. We also search for the difference in special sets of
three-jet events arising from different color connections, which could subject
to further experimental test.
| [
{
"created": "Wed, 11 Jun 2003 08:30:04 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Dec 2003 09:13:24 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Shao",
"Feng-lan",
""
],
[
"Xie",
"Qu-bing",
""
],
[
"Li",
"Shi-yuan",
""
],
[
"Wang",
"Qun",
""
]
] | We replace in the event generator JETSET the color singlet chain connection with the color separate state one as the interface between the hard and soft sectors of hadronic processes. The modified generator is applied to produce the hadronic events in $e^+ e^-$ annihilation. It describes the experimental data at the same level as the original JETSET with default parameters. This should be understood as a demonstration that color singlet chain is not the unique color connection. We also search for the difference in special sets of three-jet events arising from different color connections, which could subject to further experimental test. |
hep-ph/0607327 | Paul Romatschke | Paul Romatschke | Momentum Broadening in an Anisotropic Plasma | 14 pages, 2 figures, uses revtex4; see source for numerics; v2: typos
corrected, note added in appendix, matches published version | Phys.Rev.C75:014901,2007 | 10.1103/PhysRevC.75.014901 | BI-TP 2006/27 | hep-ph nucl-th | null | The rates governing momentum broadening in a quark-gluon plasma with a
momentum anisotropy are calculated to leading-log order for a heavy quark using
kinetic theory. It is shown how the problematic singularity for these rates at
leading-oder is lifted by next-to-leading order gluon self-energy corrections
to give a finite contribution to the leading-log result. The resulting rates
are shown to lead to larger momentum broadening along the beam axis than in the
transverse plane, which is consistent with recent STAR results. This might
indicate that the quark-gluon-plasma at RHIC is not in equilibrium.
| [
{
"created": "Sat, 29 Jul 2006 09:07:30 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jan 2007 22:26:26 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Romatschke",
"Paul",
""
]
] | The rates governing momentum broadening in a quark-gluon plasma with a momentum anisotropy are calculated to leading-log order for a heavy quark using kinetic theory. It is shown how the problematic singularity for these rates at leading-oder is lifted by next-to-leading order gluon self-energy corrections to give a finite contribution to the leading-log result. The resulting rates are shown to lead to larger momentum broadening along the beam axis than in the transverse plane, which is consistent with recent STAR results. This might indicate that the quark-gluon-plasma at RHIC is not in equilibrium. |
2204.07138 | Anil Thapa | Anish Ghoshal, Nobuchika Okada, Satomi Okada, Digesh Raut, Qaisar
Shafi, Anil Thapa | Type III seesaw with R-parity violation in light of $m_W$ (CDF) | 3 pages, typos corrected, references added, matches with published
version | null | 10.1016/j.nuclphysb.2023.116099 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Motivated by the recently reported measurement of the $W$ boson mass $M_W =
80.4335 \pm 0.0094$ GeV by the CDF collaboration, we propose a type III seesaw
extension of the minimal supersymmetric standard model (MSSM) which also
includes an R-parity violating term. Without taking potential SUSY radiative
corrections into account, we show that the CDF measurement of $M_W$ and the LEP
measurement of the $\rho$ parameter can be simultaneously accommodated at the
$2 \sigma$ level. A long-lived gravitino in a few GeV mass range is a unique
viable dark matter candidate in this framework.
| [
{
"created": "Thu, 14 Apr 2022 17:51:20 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Apr 2022 18:13:21 GMT",
"version": "v2"
},
{
"created": "Thu, 16 Feb 2023 02:28:49 GMT",
"version": "v3"
}
] | 2023-03-22 | [
[
"Ghoshal",
"Anish",
""
],
[
"Okada",
"Nobuchika",
""
],
[
"Okada",
"Satomi",
""
],
[
"Raut",
"Digesh",
""
],
[
"Shafi",
"Qaisar",
""
],
[
"Thapa",
"Anil",
""
]
] | Motivated by the recently reported measurement of the $W$ boson mass $M_W = 80.4335 \pm 0.0094$ GeV by the CDF collaboration, we propose a type III seesaw extension of the minimal supersymmetric standard model (MSSM) which also includes an R-parity violating term. Without taking potential SUSY radiative corrections into account, we show that the CDF measurement of $M_W$ and the LEP measurement of the $\rho$ parameter can be simultaneously accommodated at the $2 \sigma$ level. A long-lived gravitino in a few GeV mass range is a unique viable dark matter candidate in this framework. |
0710.0346 | Thomas Gehrmann | A. Gehrmann-De Ridder, T. Gehrmann, E.W.N. Glover, G. Heinrich | Infrared structure of e+e- --> 3 jets at NNLO | An oversubtraction of large-angle soft radiation has been corrected.
New version contains detailed explanation of the correction terms, and a
discussion of their numerical impact | JHEP 0711:058,2007 | 10.1088/1126-6708/2007/11/058 | ZU-TH 18/07, IPPP/07/62, Edinburgh 2007-26 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe the calculation of the next-to-next-to-leading order (NNLO) QCD
corrections to three-jet production and related event shape observables in
electron-positron annihilation. Infrared singularities due to double real
radiation at tree level and single real radiation at one loop are subtracted
from the full QCD matrix elements using antenna functions, which are then
integrated analytically and added to the two loop contribution. Using this
antenna subtraction method, we obtain numerically finite contributions from
five-parton and four-parton processes, and observe an explicit analytic
cancellation of infrared poles in the four-parton and three-parton
contributions. All contributions are implemented in a flexible parton-level
event generator programme, allowing the numerical computation of any
infrared-safe observable related to three-jet final states to NNLO accuracy.
| [
{
"created": "Mon, 1 Oct 2007 17:52:08 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Nov 2007 15:53:41 GMT",
"version": "v2"
},
{
"created": "Tue, 25 Nov 2008 12:42:37 GMT",
"version": "v3"
}
] | 2008-12-30 | [
[
"Ridder",
"A. Gehrmann-De",
""
],
[
"Gehrmann",
"T.",
""
],
[
"Glover",
"E. W. N.",
""
],
[
"Heinrich",
"G.",
""
]
] | We describe the calculation of the next-to-next-to-leading order (NNLO) QCD corrections to three-jet production and related event shape observables in electron-positron annihilation. Infrared singularities due to double real radiation at tree level and single real radiation at one loop are subtracted from the full QCD matrix elements using antenna functions, which are then integrated analytically and added to the two loop contribution. Using this antenna subtraction method, we obtain numerically finite contributions from five-parton and four-parton processes, and observe an explicit analytic cancellation of infrared poles in the four-parton and three-parton contributions. All contributions are implemented in a flexible parton-level event generator programme, allowing the numerical computation of any infrared-safe observable related to three-jet final states to NNLO accuracy. |
hep-ph/9705206 | Ben Allanach | B. C. Allanach (Rutherford) and S. F. King (Southampton) | Infra-Red Stable Fixed Points of Yukawa Couplings in Supersymmetric
Models | 12 pages plain LaTeX | Phys.Lett. B407 (1997) 124-130 | 10.1016/S0370-2693(97)00753-3 | RAL TR-97-019, SHEP 97-07 | hep-ph | null | We provide the solutions of the fixed point conditions of the Yukawa sector
for a large class of N=1 supersymmetric theories including the minimal and
next-to-minimal supersymmetric standard models and their grand unified and
other extensions. We also introduce a test which can discriminate between
infra-red stable, infra-red unstable and saddle point solutions, and illustrate
our methods with the example of the next-to-minimal supersymmetric standard
model. We show that in this case, the fixed point prediction of the top quark
mass is equivalent to that of the minimal supersymmetric standard model,
supporting previous numerical analyses.
| [
{
"created": "Thu, 1 May 1997 15:48:35 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Allanach",
"B. C.",
"",
"Rutherford"
],
[
"King",
"S. F.",
"",
"Southampton"
]
] | We provide the solutions of the fixed point conditions of the Yukawa sector for a large class of N=1 supersymmetric theories including the minimal and next-to-minimal supersymmetric standard models and their grand unified and other extensions. We also introduce a test which can discriminate between infra-red stable, infra-red unstable and saddle point solutions, and illustrate our methods with the example of the next-to-minimal supersymmetric standard model. We show that in this case, the fixed point prediction of the top quark mass is equivalent to that of the minimal supersymmetric standard model, supporting previous numerical analyses. |
1012.0440 | Cristian Pisano | Umberto D'Alesio, Francesco Murgia, Cristian Pisano | Azimuthal asymmetries for hadron distributions inside jets in hadronic
collisions | 8 pages, 5 figures, to appear in the proceedings of 19th
International Spin Physics Symposium (SPIN2010), Sep 27-Oct 2, 2010, Juelich
(Germany) | J.Phys.Conf.Ser.295:012064,2011 | 10.1088/1742-6596/295/1/012064 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using a generalized parton model approach including spin and intrinsic parton
motion effects, and assuming the validity of factorization for large p_T jet
production in hadronic collisions, we study the azimuthal distribution around
the jet axis of leading pions, produced in the jet fragmentation process. We
identify the observable leading-twist azimuthal asymmetries for the unpolarized
and single-polarized case related to both quark and gluon-originated jets. We
account for all physically allowed combinations of the transverse momentum
dependent (TMD) parton distribution and fragmentation functions, with special
attention to the Sivers, Boer-Mulders, and transversity quark distributions,
and to the Collins fragmentation function for quarks (and to the analogous
functions for gluon partons).
| [
{
"created": "Thu, 2 Dec 2010 14:51:50 GMT",
"version": "v1"
}
] | 2011-09-14 | [
[
"D'Alesio",
"Umberto",
""
],
[
"Murgia",
"Francesco",
""
],
[
"Pisano",
"Cristian",
""
]
] | Using a generalized parton model approach including spin and intrinsic parton motion effects, and assuming the validity of factorization for large p_T jet production in hadronic collisions, we study the azimuthal distribution around the jet axis of leading pions, produced in the jet fragmentation process. We identify the observable leading-twist azimuthal asymmetries for the unpolarized and single-polarized case related to both quark and gluon-originated jets. We account for all physically allowed combinations of the transverse momentum dependent (TMD) parton distribution and fragmentation functions, with special attention to the Sivers, Boer-Mulders, and transversity quark distributions, and to the Collins fragmentation function for quarks (and to the analogous functions for gluon partons). |
hep-ph/9605420 | Ansgar Denner | M. Roth and A. Denner | High-Energy Approximation of One-Loop Feynman Integrals | 18 pages, Latex, complete ps-file available via anonymous ftp from
ftp://ftp.physik.uni-wuerzburg.de/pub/preprint/WUE-ITP-96-006.ps | Nucl.Phys.B479:495-514,1996 | 10.1016/0550-3213(96)00435-X | WUE-ITP-96/006 | hep-ph | null | We provide high-energy approximations for all one-loop scalar 3- and 4-point
functions and the corresponding tensor integrals that appear in scattering
processes with four external on-shell particles. Our expressions are valid if
all kinematical invariants are much larger than the internal and external
masses. They contain all leading-order terms of the integrals.
| [
{
"created": "Tue, 28 May 1996 15:18:07 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Roth",
"M.",
""
],
[
"Denner",
"A.",
""
]
] | We provide high-energy approximations for all one-loop scalar 3- and 4-point functions and the corresponding tensor integrals that appear in scattering processes with four external on-shell particles. Our expressions are valid if all kinematical invariants are much larger than the internal and external masses. They contain all leading-order terms of the integrals. |
2402.03512 | Abraham Holtermann | Abraham Holtermann, Jacquelyn Noronha-Hostler, Anne M. Sickles,
Xiaoning Wang | Measuring jet energy loss fluctuations in the quark-gluon plasma via
multiparticle correlations | 25 pages, 11 figures, 4 tables | null | null | null | hep-ph nucl-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | The quark-gluon plasma (QGP) is a high temperature state of matter produced
in the collisions of two nuclei at relativistic energies. The properties of
this matter at short distance scales are probed using jets with high transverse
momentum ($p_T$) resulting from quarks and gluons scattered with large momentum
transfer in the earliest stages of the collisions. The Fourier harmonics for
anisotropies in the high transverse momentum particle yield, $v_n(p_T)$,
indicate the path length dependence of jet energy loss within the QGP. We
present a framework to build off of measurements of jet energy loss using
$v_n(p_T)$ by characterizing fluctuations in jet energy loss that are currently
not constrained experimentally. In this paper, we utilize a set of multivariate
moments and cumulants as new experimental observables to measure event-by-event
fluctuations in the azimuthal anisotropies of rare probes, and compare them to
the azimuthal anisotropies of soft particles. Ultimately, these fluctuations
can be used to quantify the magnitude and fluctuations of event-by-event jet
energy loss. We relate these quantities to existing multivariate cumulant
observables, highlight their unique properties, and validate their
sensitivities with a Monte Carlo simulation.
| [
{
"created": "Mon, 5 Feb 2024 20:59:24 GMT",
"version": "v1"
}
] | 2024-02-07 | [
[
"Holtermann",
"Abraham",
""
],
[
"Noronha-Hostler",
"Jacquelyn",
""
],
[
"Sickles",
"Anne M.",
""
],
[
"Wang",
"Xiaoning",
""
]
] | The quark-gluon plasma (QGP) is a high temperature state of matter produced in the collisions of two nuclei at relativistic energies. The properties of this matter at short distance scales are probed using jets with high transverse momentum ($p_T$) resulting from quarks and gluons scattered with large momentum transfer in the earliest stages of the collisions. The Fourier harmonics for anisotropies in the high transverse momentum particle yield, $v_n(p_T)$, indicate the path length dependence of jet energy loss within the QGP. We present a framework to build off of measurements of jet energy loss using $v_n(p_T)$ by characterizing fluctuations in jet energy loss that are currently not constrained experimentally. In this paper, we utilize a set of multivariate moments and cumulants as new experimental observables to measure event-by-event fluctuations in the azimuthal anisotropies of rare probes, and compare them to the azimuthal anisotropies of soft particles. Ultimately, these fluctuations can be used to quantify the magnitude and fluctuations of event-by-event jet energy loss. We relate these quantities to existing multivariate cumulant observables, highlight their unique properties, and validate their sensitivities with a Monte Carlo simulation. |
1604.00022 | Vladimir Skokov | Robert D. Pisarski and Vladimir V. Skokov | Chiral matrix model of the semi-Quark Gluon Plasma in QCD | 69 pages, 22 figures; version published in PRD | Phys. Rev. D 94, 034015 (2016) | 10.1103/PhysRevD.94.034015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A chiral matrix model applicable to QCD with 2+1 flavors is developed. This
requires adding a SU(3)_L x SU(3)_R x Z(3)_A nonet of scalar fields, with both
parities, and coupling these to quarks through a Yukawa coupling, y. Treating
the scalar fields in mean field approximation, the effective Lagrangian is
computed by integrating out quarks to one loop order. In addition to the usual
symmetry breaking term, linear in the current quark mass m_qk, at a nonzero
temperature T it is necessary to add a new term, ~ m_qk T^2. The parameters of
the gluon part of the matrix model are identical to that for the pure glue
theory without quarks. The parameters in the chiral matrix model are fixed by
the values, at zero temperature, of the pion decay constant and the masses of
the pions, kaons, eta, and eta'. The temperature for the chiral crossover at
T_chi = 155 MeV is determined by adjusting the Yukawa coupling y. We find
reasonable agreement with the results of numerical simulations on the lattice
for the pressure and related quantities. In the chiral limit, besides the
divergence in the chiral susceptibility there is also a milder divergence in
the susceptibility between the Polyakov loop and the chiral order parameter,
with critical exponent beta - 1. We compute derivatives with respect to a quark
chemical potential to determine the susceptibilities for baryon number, the
chi_2n. Especially sensitive tests are provided by chi_4 - chi_2 and by chi_6,
which changes in sign about T_chi. The behavior of the susceptibilities in the
chiral matrix model strongly suggests that as the temperature increases from
T_chi, that the transition to deconfinement is significantly quicker than
indicated by the measurements of the (renormalized) Polyakov loop on the
lattice.
| [
{
"created": "Thu, 31 Mar 2016 20:00:18 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jun 2016 01:49:27 GMT",
"version": "v2"
},
{
"created": "Wed, 17 Aug 2016 15:51:42 GMT",
"version": "v3"
}
] | 2016-08-18 | [
[
"Pisarski",
"Robert D.",
""
],
[
"Skokov",
"Vladimir V.",
""
]
] | A chiral matrix model applicable to QCD with 2+1 flavors is developed. This requires adding a SU(3)_L x SU(3)_R x Z(3)_A nonet of scalar fields, with both parities, and coupling these to quarks through a Yukawa coupling, y. Treating the scalar fields in mean field approximation, the effective Lagrangian is computed by integrating out quarks to one loop order. In addition to the usual symmetry breaking term, linear in the current quark mass m_qk, at a nonzero temperature T it is necessary to add a new term, ~ m_qk T^2. The parameters of the gluon part of the matrix model are identical to that for the pure glue theory without quarks. The parameters in the chiral matrix model are fixed by the values, at zero temperature, of the pion decay constant and the masses of the pions, kaons, eta, and eta'. The temperature for the chiral crossover at T_chi = 155 MeV is determined by adjusting the Yukawa coupling y. We find reasonable agreement with the results of numerical simulations on the lattice for the pressure and related quantities. In the chiral limit, besides the divergence in the chiral susceptibility there is also a milder divergence in the susceptibility between the Polyakov loop and the chiral order parameter, with critical exponent beta - 1. We compute derivatives with respect to a quark chemical potential to determine the susceptibilities for baryon number, the chi_2n. Especially sensitive tests are provided by chi_4 - chi_2 and by chi_6, which changes in sign about T_chi. The behavior of the susceptibilities in the chiral matrix model strongly suggests that as the temperature increases from T_chi, that the transition to deconfinement is significantly quicker than indicated by the measurements of the (renormalized) Polyakov loop on the lattice. |
1311.6944 | Weijian Wang | Weijian Wang and Dong-Jiang Zhang | Majorana Neutrino Mass Matrices with a Texture Zero and a Cofactor Zero
under Current Experimental Texts | 16 pages, 10 figures, 1table. arXiv admin note: text overlap with
arXiv:1306.3556 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Majorana neutrino mass textures with a texture zero and a vanishing
cofactor are reconsidered in the light of current experimental results. A
numerical and systematic analysis is carried out for all viable patterns. In
particular, we focus on the phenomenological implication of correlations
between three mixing angle (especially for $\theta_{23}$), Dirac CP-violating
phase $\delta$, the effective Majorana neutrino mass $m_{ee}$. We demonstrated
that the correlations between these variables play an important role in the
model selection and can be measured in future long-baseline oscillation and
neutrinoless double beta decay. Among the six viable patterns, it is the
type-III with normal hierarchy and type-VI with inverted hierarchy that have
the parameter space where the atmospheric neutrino mixing angle $\theta_{23}$
is less then maximal and the Dirac CP-violating phase covers its best-fit
value.
| [
{
"created": "Wed, 27 Nov 2013 11:55:59 GMT",
"version": "v1"
}
] | 2014-05-21 | [
[
"Wang",
"Weijian",
""
],
[
"Zhang",
"Dong-Jiang",
""
]
] | The Majorana neutrino mass textures with a texture zero and a vanishing cofactor are reconsidered in the light of current experimental results. A numerical and systematic analysis is carried out for all viable patterns. In particular, we focus on the phenomenological implication of correlations between three mixing angle (especially for $\theta_{23}$), Dirac CP-violating phase $\delta$, the effective Majorana neutrino mass $m_{ee}$. We demonstrated that the correlations between these variables play an important role in the model selection and can be measured in future long-baseline oscillation and neutrinoless double beta decay. Among the six viable patterns, it is the type-III with normal hierarchy and type-VI with inverted hierarchy that have the parameter space where the atmospheric neutrino mixing angle $\theta_{23}$ is less then maximal and the Dirac CP-violating phase covers its best-fit value. |
1203.1894 | Valery Lyubovitskij | Yubing Dong, Amand Faessler, Thomas Gutsche, Valery E. Lyubovitskij | Decays of Zb(+) and Zb'(+) as hadronic molecules | 9 pages | J. Phys. G: Nucl. Part. Phys. 40 (2013) 015002 | 10.1088/0954-3899/40/1/015002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The two newly observed hidden-bottom mesons Zb(10610) and Zb'(10650) with
quantum numbers J(P) = 1(+) are considered as hadronic molecules composed of
BB(*) and B(*)B(*), respectively. We give predictions for the widths of the
strong two-body decays Zb(+) to Upsilon(nS) + pi(+) and Zb'(+) to Upsilon(nS) +
pi(+) in a phenomenological Lagrangian approach.
| [
{
"created": "Thu, 8 Mar 2012 19:28:57 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Nov 2012 12:14:21 GMT",
"version": "v2"
}
] | 2012-12-03 | [
[
"Dong",
"Yubing",
""
],
[
"Faessler",
"Amand",
""
],
[
"Gutsche",
"Thomas",
""
],
[
"Lyubovitskij",
"Valery E.",
""
]
] | The two newly observed hidden-bottom mesons Zb(10610) and Zb'(10650) with quantum numbers J(P) = 1(+) are considered as hadronic molecules composed of BB(*) and B(*)B(*), respectively. We give predictions for the widths of the strong two-body decays Zb(+) to Upsilon(nS) + pi(+) and Zb'(+) to Upsilon(nS) + pi(+) in a phenomenological Lagrangian approach. |
hep-ph/0502192 | Balaji Katlai K. R. S. | K.R.S. Balaji, Jukka Maalampi | Scale dependence of the UHECR neutrino flux in extra-dimension models | 4 pages Latex, 2 eps figures | null | null | MCGILL-22-05 | hep-ph astro-ph | null | Ultra high energy cosmic ray (UHECR) neutrino fluxes measured in a fixed
target detector can have a scale dependence. In the usual standard model or any
extensions of this model (which are renormalizable), the effect is
observationally very small. However, this need not be the case in models with
extra-spatial dimensions, where the neutrino mass parameter can receive large
corrections due to a power-law running. Hence, the scale dependence may lead to
a measurable deviation from the standard prediction for the neutrino flux
ratio.
| [
{
"created": "Mon, 21 Feb 2005 16:17:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Balaji",
"K. R. S.",
""
],
[
"Maalampi",
"Jukka",
""
]
] | Ultra high energy cosmic ray (UHECR) neutrino fluxes measured in a fixed target detector can have a scale dependence. In the usual standard model or any extensions of this model (which are renormalizable), the effect is observationally very small. However, this need not be the case in models with extra-spatial dimensions, where the neutrino mass parameter can receive large corrections due to a power-law running. Hence, the scale dependence may lead to a measurable deviation from the standard prediction for the neutrino flux ratio. |
1610.03526 | Valery Lyubovitskij | Thomas Gutsche, Valery E. Lyubovitskij, Ivan Schmidt | Nucleon parton distributions in a light-front quark model | null | null | 10.1140/epjc/s10052-017-4648-5 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Continuing with our analysis of parton distributions in the nucleon, we
extend our light-front quark model in order to obtain both the helicity
independent and helicity dependent parton distributions, analytically matching
the results of global fits at the initial scale $\mu \sim 1$ GeV, and which
also contain the correct Dokshitzer-Gribov-Lipatov-Altarelli-Parisi evolution.
We also calculate the transverse parton, Wigner and Husimi distributions from a
unified point of view, using our light-front wave functions and expressing them
in terms of the parton distributions $q_v(x)$ and $\delta q_v(x)$. Our results
are very relevant for the current and future program of the COMPASS experiment
at SPS (CERN).
| [
{
"created": "Tue, 11 Oct 2016 20:53:08 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Feb 2017 13:00:47 GMT",
"version": "v2"
}
] | 2017-03-08 | [
[
"Gutsche",
"Thomas",
""
],
[
"Lyubovitskij",
"Valery E.",
""
],
[
"Schmidt",
"Ivan",
""
]
] | Continuing with our analysis of parton distributions in the nucleon, we extend our light-front quark model in order to obtain both the helicity independent and helicity dependent parton distributions, analytically matching the results of global fits at the initial scale $\mu \sim 1$ GeV, and which also contain the correct Dokshitzer-Gribov-Lipatov-Altarelli-Parisi evolution. We also calculate the transverse parton, Wigner and Husimi distributions from a unified point of view, using our light-front wave functions and expressing them in terms of the parton distributions $q_v(x)$ and $\delta q_v(x)$. Our results are very relevant for the current and future program of the COMPASS experiment at SPS (CERN). |
hep-ph/9807361 | Emilio Torrente Lujan | E. Torrente-Lujan | Finite dimensional systems with random external fields and Neutrino
propagation in fluctuating media | 12 pags., Latex. 1 fig., ps. epsfig macro. minor typo errors
corrected | Phys.Rev.D59:073001,1999 | 10.1103/PhysRevD.59.073001 | IFIC-9831, FTUV-9831, PETL-9801 | hep-ph | null | We develop the general formalism for the study of neutrino propagation in
presence of stochastic media. This formalism allows the systematic derivation
of evolution equations for averaged quantities as survival probabilities and
higher order distribution moments. The formalism applies equally to any finite
dimensional Schroedinger equation in presence of a stochastic external force.
New integro-differential equations valid for finite correlated processes are
obtained for the first time. For the particular case of exponentially
correlated processes a second order ordinary equation is obtained. As a
consequence, the Redfield equation valid for Gaussian delta-correlated noise is
rederived in a simple way. The formalism, together with the quantum correlation
theorem is applied to the computation of higher moments and correlation
functions of practical interest in forthcoming high precision neutrino
experiments. It is shown that equal and not equal time correlators follow
similar differential equations.
| [
{
"created": "Mon, 13 Jul 1998 19:08:49 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jul 1998 15:05:54 GMT",
"version": "v2"
},
{
"created": "Fri, 31 Jul 1998 15:47:13 GMT",
"version": "v3"
}
] | 2009-12-30 | [
[
"Torrente-Lujan",
"E.",
""
]
] | We develop the general formalism for the study of neutrino propagation in presence of stochastic media. This formalism allows the systematic derivation of evolution equations for averaged quantities as survival probabilities and higher order distribution moments. The formalism applies equally to any finite dimensional Schroedinger equation in presence of a stochastic external force. New integro-differential equations valid for finite correlated processes are obtained for the first time. For the particular case of exponentially correlated processes a second order ordinary equation is obtained. As a consequence, the Redfield equation valid for Gaussian delta-correlated noise is rederived in a simple way. The formalism, together with the quantum correlation theorem is applied to the computation of higher moments and correlation functions of practical interest in forthcoming high precision neutrino experiments. It is shown that equal and not equal time correlators follow similar differential equations. |
hep-ph/9703212 | Jose Ramon Espinosa | B. de Carlos (Sussex) and J.R.Espinosa (Upenn) | The baryogenesis window in the MSSM | 33 pages, latex2e, 5 figures, epsfig.sty. Final version to appear in
Nuclear Physics B | Nucl.Phys.B503:24-54,1997 | 10.1016/S0550-3213(97)00437-9 | SUSX-TH-97-005, UPR-740-T, IEM-FT-149/97 | hep-ph | null | Thermal two-loop QCD corrections associated with light stops have a dramatic
effect on the strength of the MSSM electroweak phase transition, making it more
strongly first order as required for the viability of electroweak baryogenesis.
We perform a perturbative analysis of the transition strength in this model,
including these important contributions, extending previous work to arbitrary
values of the pseudoscalar Higgs boson mass, m_A. We find a strong enough
transition in a region with 2< tan beta < 4 and m_A > 120 GeV, a light Higgs
boson with nearly standard couplings, and mass below 85 GeV within the reach of
LEP II, and one stop not much heavier than the top quark. In addition, we give
a qualitative discussion of the parameter space dependence of the transition
strength and comment on the possibility that the transition turns to a
crossover for sufficiently large Higgs masses.
| [
{
"created": "Sun, 2 Mar 1997 23:13:29 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Jul 1997 18:15:04 GMT",
"version": "v2"
}
] | 2009-10-29 | [
[
"de Carlos",
"B.",
"",
"Sussex"
],
[
"Espinosa",
"J. R.",
"",
"Upenn"
]
] | Thermal two-loop QCD corrections associated with light stops have a dramatic effect on the strength of the MSSM electroweak phase transition, making it more strongly first order as required for the viability of electroweak baryogenesis. We perform a perturbative analysis of the transition strength in this model, including these important contributions, extending previous work to arbitrary values of the pseudoscalar Higgs boson mass, m_A. We find a strong enough transition in a region with 2< tan beta < 4 and m_A > 120 GeV, a light Higgs boson with nearly standard couplings, and mass below 85 GeV within the reach of LEP II, and one stop not much heavier than the top quark. In addition, we give a qualitative discussion of the parameter space dependence of the transition strength and comment on the possibility that the transition turns to a crossover for sufficiently large Higgs masses. |
hep-ph/0606245 | Jose Edelstein | Nestor Armesto, Jose D. Edelstein, Javier Mas | Jet quenching at finite `t Hooft coupling and chemical potential from
AdS/CFT | 15 pages, 4 figures; v3: Error in the expansions and figures of
section 4 corrected, new comment and figure on the extension to finite quark
mass, cites added and typos fixed | JHEP 0609 (2006) 039 | 10.1088/1126-6708/2006/09/039 | null | hep-ph hep-th nucl-th | null | Following the nonperturbative prescription for the jet quenching parameter
recently proposed by Liu, Rajagopal and Wiedemann, we compute the first
correction in the inverse `t Hooft coupling corresponding to string alpha'
corrections in the dual background. We also consider the introduction of a
chemical potential for the U(1)^3 gauged R-symmetry. While the former mildly
diminishes the jet quenching parameter -this suggesting a smooth interpolation
between the strong coupling and perturbative results-, the latter generically
increases its value. We comment on the extension of this setup to quarks of
finite mass.
| [
{
"created": "Thu, 22 Jun 2006 19:31:46 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Jun 2006 19:59:35 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Jul 2006 17:05:45 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Armesto",
"Nestor",
""
],
[
"Edelstein",
"Jose D.",
""
],
[
"Mas",
"Javier",
""
]
] | Following the nonperturbative prescription for the jet quenching parameter recently proposed by Liu, Rajagopal and Wiedemann, we compute the first correction in the inverse `t Hooft coupling corresponding to string alpha' corrections in the dual background. We also consider the introduction of a chemical potential for the U(1)^3 gauged R-symmetry. While the former mildly diminishes the jet quenching parameter -this suggesting a smooth interpolation between the strong coupling and perturbative results-, the latter generically increases its value. We comment on the extension of this setup to quarks of finite mass. |
hep-ph/9904469 | Nicolao Fornengo | A. Bottino (Torino) and N. Fornengo (Valencia) | Dark Matter and its Particle Candidates | 31 pages, 8 figures, Lectures given at the Fifth School on
Non-Accelerator Particle Astrophysics (Abdus Salam International Centre for
Theoretical Physics, Trieste, June-July 1998), to appear in the School
Proceedings (Eds. R.A. Carrigan, Jr., G. Giacomelli and N. Paver) | null | null | DFTT 20/99, FTUV/99-24, IFIC/99-26 | hep-ph astro-ph hep-ex | null | In these lectures we first briefly review the main observational facts which
imply that most part of matter in the Universe is not visible and some recent
intriguing experimental data which would point to a significant contribution to
Omega due to a cosmological constant. We subsequently discuss some particle
candidates for dark matter, with particular emphasis for the neutralino. We
present the main properties of this particle, also in the light of the most
recent experimental results in direct search for relic particles; furthermore,
we discuss the perspectives for their indirect searches.
| [
{
"created": "Tue, 27 Apr 1999 17:11:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bottino",
"A.",
"",
"Torino"
],
[
"Fornengo",
"N.",
"",
"Valencia"
]
] | In these lectures we first briefly review the main observational facts which imply that most part of matter in the Universe is not visible and some recent intriguing experimental data which would point to a significant contribution to Omega due to a cosmological constant. We subsequently discuss some particle candidates for dark matter, with particular emphasis for the neutralino. We present the main properties of this particle, also in the light of the most recent experimental results in direct search for relic particles; furthermore, we discuss the perspectives for their indirect searches. |
2208.04965 | Debasish Borah | Debasish Borah, Suruj Jyoti Das, Rishav Roshan | Probing high scale seesaw and PBH generated dark matter via
gravitational waves with multiple tilts | 37 pages, 6 captioned figures, matches version accepted for
publication in Nucl. Phys. B | null | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a scenario where a high scale seesaw origin of light neutrino mass
and gravitational dark matter (DM) in MeV-TeV ballpark originating from
primordial black hole (PBH) evaporation can be simultaneously probed by future
observations of stochastic gravitational wave (GW) background with multiple
tilts or spectral breaks. A high scale breaking of an Abelian gauge symmetry
ensures the dynamical origin of the seesaw scale while also leading to the
formation of cosmic strings responsible for generating stochastic GW
background. The requirement of a correct DM relic in this ballpark necessitates
the inclusion of a diluter as PBH typically leads to DM overproduction. This
leads to a second early matter dominated epoch after PBH evaporation due to the
long-lived diluter. These two early matter dominated epochs, crucially
connected to the DM relic, lead to multiple spectral breaks in the otherwise
scale-invariant GW spectrum formed by cosmic strings. We find interesting
correlations between DM mass and turning point frequencies of GW spectrum which
are within reach of several near future experiments like LISA, BBO, ET, CE,
etc.
| [
{
"created": "Tue, 9 Aug 2022 18:00:04 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Mar 2024 13:58:48 GMT",
"version": "v2"
}
] | 2024-03-28 | [
[
"Borah",
"Debasish",
""
],
[
"Das",
"Suruj Jyoti",
""
],
[
"Roshan",
"Rishav",
""
]
] | We propose a scenario where a high scale seesaw origin of light neutrino mass and gravitational dark matter (DM) in MeV-TeV ballpark originating from primordial black hole (PBH) evaporation can be simultaneously probed by future observations of stochastic gravitational wave (GW) background with multiple tilts or spectral breaks. A high scale breaking of an Abelian gauge symmetry ensures the dynamical origin of the seesaw scale while also leading to the formation of cosmic strings responsible for generating stochastic GW background. The requirement of a correct DM relic in this ballpark necessitates the inclusion of a diluter as PBH typically leads to DM overproduction. This leads to a second early matter dominated epoch after PBH evaporation due to the long-lived diluter. These two early matter dominated epochs, crucially connected to the DM relic, lead to multiple spectral breaks in the otherwise scale-invariant GW spectrum formed by cosmic strings. We find interesting correlations between DM mass and turning point frequencies of GW spectrum which are within reach of several near future experiments like LISA, BBO, ET, CE, etc. |
2006.16593 | Hiroyuki Umeeda Dr. | Hsiang-nan Li and Hiroyuki Umeeda | QCD sum rules with spectral densities solved in inverse problems | 17 pages, 14 figures, version accepted for publication in Phys. Rev.
D, title is changed | Phys. Rev. D 102, 114014 (2020) | 10.1103/PhysRevD.102.114014 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct QCD sum rules for nonperturbative studies without assuming the
quark-hadron duality for the spectral density at low energy on the hadron side.
Instead, both resonance and continuum contributions to the spectral density are
solved with the operator-product-expansion input on the quark side by treating
sum rules as an inverse problem. This new formalism does not involve the
continuum threshold, does not require the Borel transformation and stability
analysis, and can be extended to extract properties of excited states. Taking
the two-current correlator as an example, we demonstrate that the series of
$\rho$ resonances can emerge in our formalism, and the decay constants
$f_{\rho(770)} (f_{\rho(1450)},f_{\rho(1700)},f_{\rho(1900)})\approx$ 0.22
(0.19, 0.14, 0.14) GeV for the masses $m_{\rho(770)}
(m_{\rho(1450)},m_{\rho(1700)},m_{\rho(1900)})\approx$ 0.78 (1.46, 1.70, 1.90)
GeV are determined. We also show that the decay width
$\Gamma_{\rho(770)}\approx 0.17$ GeV can be obtained by substituting a
Breit-Wigner parametrization for the $\rho(770)$ pole on the hadron side. It is
observed that quark condensates of dimension-six on the quark side are crucial
for establishing those $\rho$ resonances. Handling the conventional sum rules
with the duality assumption as an inverse problem, we find that the multiple
pole sum rules widely adopted in the literature do not describe the $\rho$
excitations reasonably. The precision of our theoretical outcomes can be
improved systematically by including higher-order and higher-power corrections
on the quark side. Broad applications of this formalism to abundant low energy
QCD observables are expected.
| [
{
"created": "Tue, 30 Jun 2020 08:10:23 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Jul 2020 10:34:45 GMT",
"version": "v2"
},
{
"created": "Thu, 26 Nov 2020 11:09:35 GMT",
"version": "v3"
}
] | 2021-01-04 | [
[
"Li",
"Hsiang-nan",
""
],
[
"Umeeda",
"Hiroyuki",
""
]
] | We construct QCD sum rules for nonperturbative studies without assuming the quark-hadron duality for the spectral density at low energy on the hadron side. Instead, both resonance and continuum contributions to the spectral density are solved with the operator-product-expansion input on the quark side by treating sum rules as an inverse problem. This new formalism does not involve the continuum threshold, does not require the Borel transformation and stability analysis, and can be extended to extract properties of excited states. Taking the two-current correlator as an example, we demonstrate that the series of $\rho$ resonances can emerge in our formalism, and the decay constants $f_{\rho(770)} (f_{\rho(1450)},f_{\rho(1700)},f_{\rho(1900)})\approx$ 0.22 (0.19, 0.14, 0.14) GeV for the masses $m_{\rho(770)} (m_{\rho(1450)},m_{\rho(1700)},m_{\rho(1900)})\approx$ 0.78 (1.46, 1.70, 1.90) GeV are determined. We also show that the decay width $\Gamma_{\rho(770)}\approx 0.17$ GeV can be obtained by substituting a Breit-Wigner parametrization for the $\rho(770)$ pole on the hadron side. It is observed that quark condensates of dimension-six on the quark side are crucial for establishing those $\rho$ resonances. Handling the conventional sum rules with the duality assumption as an inverse problem, we find that the multiple pole sum rules widely adopted in the literature do not describe the $\rho$ excitations reasonably. The precision of our theoretical outcomes can be improved systematically by including higher-order and higher-power corrections on the quark side. Broad applications of this formalism to abundant low energy QCD observables are expected. |
hep-ph/9704235 | Chi-Sing Lam | C.S. Lam (McGill University) and K.F. Liu (University of Kentucky) | Consistency of the Baryon-Multimeson Amplitudes for Large-N_c QCD | latex file with two postscript figures | Phys.Rev.Lett. 79 (1997) 597-600 | 10.1103/PhysRevLett.79.597 | McGill/97-03, UK/97-04 | hep-ph hep-th | null | We study the pion-baryon scattering process $\pi+B \to (n-1)\pi+B$ in a QCD
theory with a large number (N_c) of colors. It is known that this scattering
amplitudes decreases with N_c like N_c^{1-n/2}, and that its individual tree
diagrams grow like N_c^{n/2}. The only way these two can be consistent is for
n-1 powers of N_c to be cancelled when the Feynman diagrams are summed. We
prove this to be true in tree order for any n.
| [
{
"created": "Fri, 4 Apr 1997 14:50:22 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Lam",
"C. S.",
"",
"McGill University"
],
[
"Liu",
"K. F.",
"",
"University of Kentucky"
]
] | We study the pion-baryon scattering process $\pi+B \to (n-1)\pi+B$ in a QCD theory with a large number (N_c) of colors. It is known that this scattering amplitudes decreases with N_c like N_c^{1-n/2}, and that its individual tree diagrams grow like N_c^{n/2}. The only way these two can be consistent is for n-1 powers of N_c to be cancelled when the Feynman diagrams are summed. We prove this to be true in tree order for any n. |
hep-ph/9811303 | Yan Hua-gang | Chao-Shang Huang and Hua-Gang Yan | Exclusive Rare Decays of Heavy Baryons to Light Baryons: $\Lambda_b \ri
ghtarrow \Lambda \gamma$ and $\Lambda_b \to \Lambda l^{+} l^{-}$ | 10 pages, 4 figures, with minor modifications to Eq.(26), Appendix
and Fig.4 | Phys.Rev.D59:114022,1999; Erratum-ibid.D61:039901,2000 | 10.1103/PhysRevD.59.114022 10.1103/PhysRevD.61.039901 | null | hep-ph | null | Rare decays $\Lambda_b \to \Lambda \gamma$ and $\Lambda_b \to \Lambda l^{+}
l^{-}$ (l= e, $\mu$) are examined. We use QCD sum rules to calculate the
hadronic matrix elements governing the decays. The $\Lambda$ polarization in
the decays is analyzed and it is shown that the polarization parameter in
$\Lambda_b \to \Lambda \gamma$ does not depends on the values of hadronic form
factors. And the energy spectrum of $\Lambda$ in $\Lambda_b \to \Lambda l^{+}
l^{-}$ is given.
| [
{
"created": "Wed, 11 Nov 1998 09:03:52 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Nov 1998 02:50:03 GMT",
"version": "v2"
},
{
"created": "Wed, 18 Nov 1998 02:00:43 GMT",
"version": "v3"
},
{
"created": "Mon, 11 Jan 1999 07:11:59 GMT",
"version": "v4"
},
{
"created": "Tue, 19 Jan 1999 12:08:12 GMT",
"version": "v5"
},
{
"created": "Sun, 25 Jul 1999 13:07:33 GMT",
"version": "v6"
}
] | 2014-11-17 | [
[
"Huang",
"Chao-Shang",
""
],
[
"Yan",
"Hua-Gang",
""
]
] | Rare decays $\Lambda_b \to \Lambda \gamma$ and $\Lambda_b \to \Lambda l^{+} l^{-}$ (l= e, $\mu$) are examined. We use QCD sum rules to calculate the hadronic matrix elements governing the decays. The $\Lambda$ polarization in the decays is analyzed and it is shown that the polarization parameter in $\Lambda_b \to \Lambda \gamma$ does not depends on the values of hadronic form factors. And the energy spectrum of $\Lambda$ in $\Lambda_b \to \Lambda l^{+} l^{-}$ is given. |
hep-ph/0512196 | Sergei Nedelko | G. V. Efimov | On meson masses | 15 pages, 6 figures | FewBodySyst.40:131-143,2007 | 10.1007/s00601-007-0173-7 | null | hep-ph | null | It is shown that in the framework of analytical confinement, when quark and
gluon propagators are induced by an vacuum selfdual gluon field with constant
strength, the masses of meson with quantum numbers $Q=J^P$ and quark
constituents $m_1,~m_2$ are described with reasonable accuracy by the formula
$$ M_Q(m_1,m_2)=(m_1+m_2)[1+{A_Q\over (m_1^2+1.13m_1m_2+m_2^2)^{0.625}}],$$
where a constant positive parameter $A_Q$ is unique for all mesons with quantum
numbers $Q=J^P$. Sets of mesons $J^P=0^-,~1^-,~0^+,~1^+,~2^+,~3^-$ and
different flavors constituent quarks $(u=d,~s,~,c~,b)$ are considered.
| [
{
"created": "Thu, 15 Dec 2005 07:04:06 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Efimov",
"G. V.",
""
]
] | It is shown that in the framework of analytical confinement, when quark and gluon propagators are induced by an vacuum selfdual gluon field with constant strength, the masses of meson with quantum numbers $Q=J^P$ and quark constituents $m_1,~m_2$ are described with reasonable accuracy by the formula $$ M_Q(m_1,m_2)=(m_1+m_2)[1+{A_Q\over (m_1^2+1.13m_1m_2+m_2^2)^{0.625}}],$$ where a constant positive parameter $A_Q$ is unique for all mesons with quantum numbers $Q=J^P$. Sets of mesons $J^P=0^-,~1^-,~0^+,~1^+,~2^+,~3^-$ and different flavors constituent quarks $(u=d,~s,~,c~,b)$ are considered. |
2102.01650 | Natsumi Ikeno | Natsumi Ikeno, Melahat Bayar, Eulogio Oset | Combined theoretical study of the $D^+ \to \pi^+ \eta \eta$ and $D^+ \to
\pi^+ \pi^0 \eta $ reactions | 11 pages, 12 figures | null | 10.1140/epjc/s10052-021-09174-w | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the $D^+ \to \pi^+ \eta \eta $ and $D^+ \to \pi^+ \pi^0 \eta$
reactions, which are single Cabibbo suppressed and can proceed both through
internal and external emission. The primary mechanisms at quark level are
considered, followed by hadronization to produce three mesons in the $D^+$
decay, and after that the final state interaction of these mesons leads to the
production of the $a_0(980)$ resonance, seen in the $\pi^+ \eta$, $\pi^0 \eta$
mass distributions. The theory has three unknown parameters to determine the
shape of the distributions and the ratio between the $D^+ \to \pi^+ \eta \eta$
and $D^+ \to \pi^+ \pi^0 \eta$ rates. This ratio restricts much the sets of
parameters but there is still much freedom leading to different shapes in the
mass distributions. We call for a measurement of these mass distributions that
will settle the reaction mechanism, while at the same time provide relevant
information on the way that the $a_0(980)$ resonance is produced in the
reactions.
| [
{
"created": "Tue, 2 Feb 2021 18:04:04 GMT",
"version": "v1"
}
] | 2021-05-19 | [
[
"Ikeno",
"Natsumi",
""
],
[
"Bayar",
"Melahat",
""
],
[
"Oset",
"Eulogio",
""
]
] | We study the $D^+ \to \pi^+ \eta \eta $ and $D^+ \to \pi^+ \pi^0 \eta$ reactions, which are single Cabibbo suppressed and can proceed both through internal and external emission. The primary mechanisms at quark level are considered, followed by hadronization to produce three mesons in the $D^+$ decay, and after that the final state interaction of these mesons leads to the production of the $a_0(980)$ resonance, seen in the $\pi^+ \eta$, $\pi^0 \eta$ mass distributions. The theory has three unknown parameters to determine the shape of the distributions and the ratio between the $D^+ \to \pi^+ \eta \eta$ and $D^+ \to \pi^+ \pi^0 \eta$ rates. This ratio restricts much the sets of parameters but there is still much freedom leading to different shapes in the mass distributions. We call for a measurement of these mass distributions that will settle the reaction mechanism, while at the same time provide relevant information on the way that the $a_0(980)$ resonance is produced in the reactions. |
2201.01746 | Bolun Hu | Zhiyu Lei, Bolun Hu and Xingbo Zhao | Pair production in strong electric fields | 23 pages, 24 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We study the electron-positron pair production process in strong background
electric fields with spatio-temporal inhomogeneity in the time-dependent Basis
Light-front Quantization approach. We calculate the observables such as the
invariant mass and the longitudinal momentum distribution of the produced pairs
as functions of evolution time and compare the vacuum decay rate with that of
the Schwinger effect. We observe a critical intensity of background field,
above which the vacuum decay rate is no longer oscillating with time
periodically as in perturbation theory. This work may provide the foundation
for the study of the pair production process in strong fields with realistic
spacetime structures.
| [
{
"created": "Wed, 5 Jan 2022 18:13:22 GMT",
"version": "v1"
}
] | 2022-01-06 | [
[
"Lei",
"Zhiyu",
""
],
[
"Hu",
"Bolun",
""
],
[
"Zhao",
"Xingbo",
""
]
] | We study the electron-positron pair production process in strong background electric fields with spatio-temporal inhomogeneity in the time-dependent Basis Light-front Quantization approach. We calculate the observables such as the invariant mass and the longitudinal momentum distribution of the produced pairs as functions of evolution time and compare the vacuum decay rate with that of the Schwinger effect. We observe a critical intensity of background field, above which the vacuum decay rate is no longer oscillating with time periodically as in perturbation theory. This work may provide the foundation for the study of the pair production process in strong fields with realistic spacetime structures. |
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