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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1608.05240 | Andreas Trautner | Andreas Trautner | CP and other Symmetries of Symmetries | PhD thesis, 130 pages, http://mediatum.ub.tum.de?id=1307248 | null | null | null | hep-ph cond-mat.other hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Outer automorphisms of symmetries ("symmetries of symmetries") in
relativistic quantum field theories are studied, including charge conjugation
(C), space-reflection (P) , and time-reversal (T) transformations. The group
theory of outer automorphisms is pedagogically introduced and it is shown that
CP transformations are special outer automorphisms of the global, local, and
space-time symmetries of a theory. It is shown that certain discrete groups
allow for a group theoretical prediction of parameter independent CP violating
complex phases with fixed geometrical values. The remainder of this thesis
pioneers the study of outer automorphisms which are not related to C, P, or T.
It is shown how outer automorphisms, in general, relate symmetry invariants
and, in theories with spontaneous symmetry breaking, imply relations between
different vacuum expectation values. Thereby, outer automorphisms can give rise
to emergent symmetries. An example model with a discrete symmetry and three
copies of the Standard Model Higgs field is discussed, in which the rich outer
automorphism structure completely fixes the Higgs VEVs in their field space
direction, including CP violating relative phases. This underlies the
phenomenon of spontaneous geometrical CP violation. The possible relevance of
outer automorphisms for a wide field of future studies is highlighted.
| [
{
"created": "Thu, 18 Aug 2016 11:28:37 GMT",
"version": "v1"
}
] | 2016-08-19 | [
[
"Trautner",
"Andreas",
""
]
] | Outer automorphisms of symmetries ("symmetries of symmetries") in relativistic quantum field theories are studied, including charge conjugation (C), space-reflection (P) , and time-reversal (T) transformations. The group theory of outer automorphisms is pedagogically introduced and it is shown that CP transformations are special outer automorphisms of the global, local, and space-time symmetries of a theory. It is shown that certain discrete groups allow for a group theoretical prediction of parameter independent CP violating complex phases with fixed geometrical values. The remainder of this thesis pioneers the study of outer automorphisms which are not related to C, P, or T. It is shown how outer automorphisms, in general, relate symmetry invariants and, in theories with spontaneous symmetry breaking, imply relations between different vacuum expectation values. Thereby, outer automorphisms can give rise to emergent symmetries. An example model with a discrete symmetry and three copies of the Standard Model Higgs field is discussed, in which the rich outer automorphism structure completely fixes the Higgs VEVs in their field space direction, including CP violating relative phases. This underlies the phenomenon of spontaneous geometrical CP violation. The possible relevance of outer automorphisms for a wide field of future studies is highlighted. |
1004.0569 | Deog Ki Hong | Deog Ki Hong | Holographic Estimate of Muon g-2 | 7 pages, 6 figures, to appear in proceedings of "Strong Coupling
Gauge Theories in LHC Era (SCGT09)," Nagoya, Japan | null | 10.1142/9789814329521_0019 | PNUTP-10/A06 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I present recent calculations of the hadronic contributions to muon anomalous
magnetic moment in holographic QCD, based on gauge/gravity duality. The
holographic estimates are compared well with the analysis based on recently
revised BaBar measurements of e+ e- -> pi+ pi- cross-sections and also with
other model calculations for the light-by-light scattering contributions.
| [
{
"created": "Mon, 5 Apr 2010 06:32:05 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Hong",
"Deog Ki",
""
]
] | I present recent calculations of the hadronic contributions to muon anomalous magnetic moment in holographic QCD, based on gauge/gravity duality. The holographic estimates are compared well with the analysis based on recently revised BaBar measurements of e+ e- -> pi+ pi- cross-sections and also with other model calculations for the light-by-light scattering contributions. |
hep-ph/9710526 | Nikolaos Tetradis | C. Panagiotakopoulos, N. Tetradis | Two-Stage Inflation as a Solution of the Initial Condition Problem of
Hybrid Inflation | 12 pages, LaTeX, uses equation.sty, 4 figures in eps format | Phys.Rev.D59:083502,1999 | 10.1103/PhysRevD.59.083502 | CERN-TH/97-301 | hep-ph astro-ph | null | We address the issue of fine-tuning of the initial field configuration that
can lead to hybrid inflation in the context of global supersymmetry. This
problem is generated by the difference between the energy scale at which the
Universe emerges from the Planck era and the inflationary scale implied by the
COBE observations: V^{1/4} \sim 10^{-3} m_{Pl}. We propose a scenario with two
stages of inflation. The first stage, with a typical scale not far from m_{Pl},
occurs ``naturally'' and provides the necessary homogeneity for the second
stage. The latter generates the density perturbations that result in the cosmic
microwave background anisotropy observed by COBE.
| [
{
"created": "Wed, 29 Oct 1997 15:36:30 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Nov 1998 16:51:03 GMT",
"version": "v2"
}
] | 2009-06-19 | [
[
"Panagiotakopoulos",
"C.",
""
],
[
"Tetradis",
"N.",
""
]
] | We address the issue of fine-tuning of the initial field configuration that can lead to hybrid inflation in the context of global supersymmetry. This problem is generated by the difference between the energy scale at which the Universe emerges from the Planck era and the inflationary scale implied by the COBE observations: V^{1/4} \sim 10^{-3} m_{Pl}. We propose a scenario with two stages of inflation. The first stage, with a typical scale not far from m_{Pl}, occurs ``naturally'' and provides the necessary homogeneity for the second stage. The latter generates the density perturbations that result in the cosmic microwave background anisotropy observed by COBE. |
hep-ph/0008180 | Stefan Wolf | Stefan Wolf (TTP, U. of Karlsruhe) | Kinematic Effects in Quarkonia Production | LaTeX, 7 pages, 3 figures, The complete paper is also available via
the www at http://www-ttp.physik.uni-karlsruhe.de/Preprints/ | Nucl.Phys.Proc.Suppl. 93 (2001) 172-175 | 10.1016/S0920-5632(00)01097-5 | TTP00-18 | hep-ph | null | We investigate energy (momentum) distributions in J/Psi photoproduction and
J/Psi production in B meson decay. In particular the upper endpoint region of
the spectrum is examined where the effect of soft gluon emission from the ccbar
pair becomes important. Constructing a model which is consistent with the
so-called shape function formalism we consider these fragmentation effects and
show that the relevance of possible colour octet contributions in the
photoproduction channel is still inconclusive.
| [
{
"created": "Thu, 17 Aug 2000 11:42:56 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Wolf",
"Stefan",
"",
"TTP, U. of Karlsruhe"
]
] | We investigate energy (momentum) distributions in J/Psi photoproduction and J/Psi production in B meson decay. In particular the upper endpoint region of the spectrum is examined where the effect of soft gluon emission from the ccbar pair becomes important. Constructing a model which is consistent with the so-called shape function formalism we consider these fragmentation effects and show that the relevance of possible colour octet contributions in the photoproduction channel is still inconclusive. |
2107.03420 | Francesco Schiavone | Francesco Schiavone (Bari Univ.), Daniele Montanino (Lecce Univ. &
INFN Lecce), Alessandro Mirizzi (Bari Univ. & INFN Bari), Francesco Capozzi
(Virginia Tech.) | Axion-like particles from primordial black holes shining through the
Universe | v2. Revised version. Minor changes. References updated. Text
clarified. Matches the version published on JCAP. (33 pages, 12 pdf figures) | JCAP 08 (2021), p. 063 | 10.1088/1475-7516/2021/08/063 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We consider a cosmological scenario in which the very early Universe
experienced a transient epoch of matter domination due to the formation of a
large population of primordial black holes (PBHs) with masses $M \lesssim
10^{9}\,\textrm{g}$, that evaporate before Big Bang nucleosynthesis. In this
context, Hawking radiation would be a non-thermal mechanism to produce a cosmic
background of axion-like particles (ALPs). We assume the minimal scenario in
which these ALPs couple only with photons. In the case of ultralight ALPs ($m_a
\lesssim 10^{-9}\,\textrm{eV}$) the cosmic magnetic fields might trigger
ALP-photon conversions, while for masses $m_a \gtrsim 10\,\textrm{eV}$
spontaneous ALP decay in photon pairs would be effective. We investigate the
impact of these mechanisms on the cosmic X-ray background, on the excess in
X-ray luminosity in Galaxy Clusters, and on the process of cosmic reionization.
| [
{
"created": "Wed, 7 Jul 2021 18:09:20 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Sep 2021 09:45:46 GMT",
"version": "v2"
}
] | 2021-09-03 | [
[
"Schiavone",
"Francesco",
"",
"Bari Univ."
],
[
"Montanino",
"Daniele",
"",
"Lecce Univ. &\n INFN Lecce"
],
[
"Mirizzi",
"Alessandro",
"",
"Bari Univ. & INFN Bari"
],
[
"Capozzi",
"Francesco",
"",
"Virginia Tech."
]
] | We consider a cosmological scenario in which the very early Universe experienced a transient epoch of matter domination due to the formation of a large population of primordial black holes (PBHs) with masses $M \lesssim 10^{9}\,\textrm{g}$, that evaporate before Big Bang nucleosynthesis. In this context, Hawking radiation would be a non-thermal mechanism to produce a cosmic background of axion-like particles (ALPs). We assume the minimal scenario in which these ALPs couple only with photons. In the case of ultralight ALPs ($m_a \lesssim 10^{-9}\,\textrm{eV}$) the cosmic magnetic fields might trigger ALP-photon conversions, while for masses $m_a \gtrsim 10\,\textrm{eV}$ spontaneous ALP decay in photon pairs would be effective. We investigate the impact of these mechanisms on the cosmic X-ray background, on the excess in X-ray luminosity in Galaxy Clusters, and on the process of cosmic reionization. |
hep-ph/9701404 | Ira Rothstein | Ira Z. Rothstein and M.B. Wise | The Octet Structure Function and Radiative Quarkonia Decay | 9 pages, LaTex, Contribution from ^1S_0 included | Phys.Lett. B402 (1997) 346-350 | 10.1016/S0370-2693(97)00462-0 | UCSD-97-02, CALT-68-2095 | hep-ph | null | The Operator Product Expansion, in conjunction with the power counting of
non-relativistic field theory, is used to examine the end-point region of the
radiative decay of heavy quark bound states with $^3S_1$ quantum numbers,
$Q\bar{Q}\rightarrow \gamma+X$. We identify an infinite class of operators that
determine the shape of the photonic end-point spectrum. These operators can be
resummed to form an octet structure function which parameterizes the energy of
the dynamical gluon content of the leading octet Fock state component of the
quarkonium. This color-octet contribution is important when the photon spectrum
is examined with a resolution given by $\Delta E_\gamma \sim m_Qv^2$, where
$v^2$ is the relative quark velocity squared. The formalism used makes explicit
the shift of the end-point from its partonic to its hadronic value.
| [
{
"created": "Wed, 29 Jan 1997 02:40:59 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Feb 1997 01:59:59 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Rothstein",
"Ira Z.",
""
],
[
"Wise",
"M. B.",
""
]
] | The Operator Product Expansion, in conjunction with the power counting of non-relativistic field theory, is used to examine the end-point region of the radiative decay of heavy quark bound states with $^3S_1$ quantum numbers, $Q\bar{Q}\rightarrow \gamma+X$. We identify an infinite class of operators that determine the shape of the photonic end-point spectrum. These operators can be resummed to form an octet structure function which parameterizes the energy of the dynamical gluon content of the leading octet Fock state component of the quarkonium. This color-octet contribution is important when the photon spectrum is examined with a resolution given by $\Delta E_\gamma \sim m_Qv^2$, where $v^2$ is the relative quark velocity squared. The formalism used makes explicit the shift of the end-point from its partonic to its hadronic value. |
hep-ph/0105264 | Kenji Fukushima | K. Fukushima, K. Ohnishi and K. Ohta | Slope of the topological susceptibility at zero temperature and finite
temperature in the Nambu-Jona-Lasinio model | 8 pages, 3 figures, submitted to Phys. Lett. B | Phys.Lett.B514:200-203,2001 | 10.1016/S0370-2693(01)00778-X | null | hep-ph | null | We estimate the slope of the topological susceptibility in the three flavour
Nambu-Jona-Lasinio model with the 't Hooft interaction. The results are
consistent with the evaluation from the QCD sum rule in favour of the full
topological susceptibility. We apply it to the Shore-Veneziano formula to find
that it shows satisfactory agreement with the anomalous suppression of the
flavour-singlet axial charge. The behaviour at finite temperature is also
discussed.
| [
{
"created": "Fri, 25 May 2001 10:49:28 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Fukushima",
"K.",
""
],
[
"Ohnishi",
"K.",
""
],
[
"Ohta",
"K.",
""
]
] | We estimate the slope of the topological susceptibility in the three flavour Nambu-Jona-Lasinio model with the 't Hooft interaction. The results are consistent with the evaluation from the QCD sum rule in favour of the full topological susceptibility. We apply it to the Shore-Veneziano formula to find that it shows satisfactory agreement with the anomalous suppression of the flavour-singlet axial charge. The behaviour at finite temperature is also discussed. |
hep-ph/9712380 | Thomas Gajdosik | A. Bartl, E. Christova, T. Gajdosik, W. Majerotto | SUSY induced CP violation in e+e- to t\bar{t} | 4 pages, LaTeX, 2 figures included as separate files, uses epsfig.sty
and espcrc2.sty. Talk presented by T.Gajdosik at the International Workshop
``Beyond the Standard Model: from Theory to Experiment, October 13 -- 17,
1997, Valencia, Spain. To appear in the Proceedings | null | null | hep-ph/yymmnnn, HEPHY-PUB 681/97, INRNE--TH--97/14, UWThPh-1997-48 | hep-ph | null | The CP violating electric and weak dipole moment form factors of the top
quark, $\dgs$ and $\dzs$, appear in the process \mbox{$e^{+}e^{-} \to t
\bar{t}$}. We present a complete analysis of these dipole moment formfactors
within the Minimal Supersymmetric Standard Model with complex parameters. We
include gluino, chargino, and neutralino exchange in the loop of the
\mbox{$\gamma t\bar{t}$} and \mbox{$Z t\bar{t}$} vertex. We give analytic
expressions and present numerical results for the asymmetries that measure
these formfactors.
| [
{
"created": "Mon, 15 Dec 1997 12:56:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bartl",
"A.",
""
],
[
"Christova",
"E.",
""
],
[
"Gajdosik",
"T.",
""
],
[
"Majerotto",
"W.",
""
]
] | The CP violating electric and weak dipole moment form factors of the top quark, $\dgs$ and $\dzs$, appear in the process \mbox{$e^{+}e^{-} \to t \bar{t}$}. We present a complete analysis of these dipole moment formfactors within the Minimal Supersymmetric Standard Model with complex parameters. We include gluino, chargino, and neutralino exchange in the loop of the \mbox{$\gamma t\bar{t}$} and \mbox{$Z t\bar{t}$} vertex. We give analytic expressions and present numerical results for the asymmetries that measure these formfactors. |
hep-ph/0510102 | Elena G. Ferreiro | Elena Ferreiro | Color strings, Pomerons and Color Glass Condensate | 4 pages, 1 tex file, no figures, one sty file. Proceedings of the
XIth International Conference on Elastic and Diffractive Scattering, Chateau
de Blois, France, May 15 - 20, 2005 | null | null | null | hep-ph | null | In the recent experiments like DIS at HERA or the heavy-ion experiments at
RHIC, and also in expected LHC at CERN, the number of involved partons is very
large, due to the high energy and/or the high number of participants of those
experiments. These high parton densities should in principal lead to an
extremely huge multiparticle production, but experimentally we have seen that
this is not the case. So there should be a mechanism that reduces the number of
created particle. Here, I review the problem of parton saturation and its
implications through three in principal different approaches, but somewhat
related: saturation in a geometrical approach, QCD saturation through the Color
Glass Condensate and perturbative Pomeron approach with initial conditions.
| [
{
"created": "Fri, 7 Oct 2005 19:25:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ferreiro",
"Elena",
""
]
] | In the recent experiments like DIS at HERA or the heavy-ion experiments at RHIC, and also in expected LHC at CERN, the number of involved partons is very large, due to the high energy and/or the high number of participants of those experiments. These high parton densities should in principal lead to an extremely huge multiparticle production, but experimentally we have seen that this is not the case. So there should be a mechanism that reduces the number of created particle. Here, I review the problem of parton saturation and its implications through three in principal different approaches, but somewhat related: saturation in a geometrical approach, QCD saturation through the Color Glass Condensate and perturbative Pomeron approach with initial conditions. |
hep-ph/0011229 | Kei Iida | Kei Iida (1 and 2), Gordon Baym (1) ((1) UIUC, (2) Univ. of Tokyo) | The superfluid phases of quark matter: Ginzburg-Landau theory and color
neutrality | 24 pages, 2 figures, Revtex, submitted to Physical Review D | Phys.Rev.D63:074018,2001; Erratum-ibid.D66:059903,2002 | 10.1103/PhysRevD.63.074018 10.1103/PhysRevD.66.059903 | UTAP-377 | hep-ph cond-mat.supr-con nucl-th | null | We apply Ginzburg-Landau theory to determine BCS pairing in a
strongly-coupled uniform superfluid of three-flavor massless quarks in flavor
equilibrium. We elucidate the phase diagram near the critical temperature in
the space of the parameters characterizing the thermodynamic potential terms of
fourth order in the pairing gap. Within the color and flavor antisymmetric
channel with zero total angular momentum, the phase diagram contains an
isoscalar (IS) color-antitriplet phase and a color-flavor-locked (CFL) phase,
reached by a second order transition from the normal state, as well as states
reached by a first order transition. We complement the general Ginzburg-Landau
approach by deriving the high-density asymptotic form of the Ginzburg-Landau
free energy from the weak-coupling gap equation. The dynamically-screened,
long-range color magnetic interactions are taken into account in solving the
gap equation. We find that in the limit of weak coupling, the IS phase is less
favorable near the transition temperature than the CFL phase. In view of the
fact that deconfined quark matter must be color charge neutral, we incorporate
the constraint of overall color neutrality into the Ginzburg-Landau theory and
the gap equation. This constraint yields a disparity in the chemical potential
between colors and reduces the size of the gap, in the presence of the
anisotropy of the order parameters in color space. In comparison with the case
in which there are no chemical potential differences between colors and hence
the superfluid generally has nonzero net color charge, we find that while the
constraint of color neutrality has only negligible effects on the gap in the
weak coupling regime, it appreciably destabilizes the IS phase in the strong
coupling regime without affecting the CFL phase.
| [
{
"created": "Sat, 18 Nov 2000 05:48:40 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Iida",
"Kei",
"",
"1 and 2"
],
[
"Baym",
"Gordon",
"",
"UIUC"
]
] | We apply Ginzburg-Landau theory to determine BCS pairing in a strongly-coupled uniform superfluid of three-flavor massless quarks in flavor equilibrium. We elucidate the phase diagram near the critical temperature in the space of the parameters characterizing the thermodynamic potential terms of fourth order in the pairing gap. Within the color and flavor antisymmetric channel with zero total angular momentum, the phase diagram contains an isoscalar (IS) color-antitriplet phase and a color-flavor-locked (CFL) phase, reached by a second order transition from the normal state, as well as states reached by a first order transition. We complement the general Ginzburg-Landau approach by deriving the high-density asymptotic form of the Ginzburg-Landau free energy from the weak-coupling gap equation. The dynamically-screened, long-range color magnetic interactions are taken into account in solving the gap equation. We find that in the limit of weak coupling, the IS phase is less favorable near the transition temperature than the CFL phase. In view of the fact that deconfined quark matter must be color charge neutral, we incorporate the constraint of overall color neutrality into the Ginzburg-Landau theory and the gap equation. This constraint yields a disparity in the chemical potential between colors and reduces the size of the gap, in the presence of the anisotropy of the order parameters in color space. In comparison with the case in which there are no chemical potential differences between colors and hence the superfluid generally has nonzero net color charge, we find that while the constraint of color neutrality has only negligible effects on the gap in the weak coupling regime, it appreciably destabilizes the IS phase in the strong coupling regime without affecting the CFL phase. |
hep-ph/9706266 | Davor Palle | Davor Palle (Rugjer Boskovic Institute, Zagreb, Hrvatska) | On the broken gauge, conformal and discrete symmetries in particle
physics | 27 pages, LaTeX style; v2: published version, two figures added | Il Nuovo Cimento A 109 (1996) 1535 | 10.1007/BF02778238 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Relationships between gauge, conformal and discrete symmetries in particle
physics are analysed. We study also the effect of the electroweak mixing on the
cancellation of SU(2) anomalous actions. It is shown that the relation
theta_{W} = 2(theta_{12}+theta_{23}+theta_{13}) between the Weinberg angle and
the Cabibbo-Kobayashi-Maskawa angles should be satisfied and this effect is
completely defined by the mixing of Dirac fermions. We compare two mechanisms
of the spontaneous breaking of gauge symmetry, discuss the renormalizability of
theories, and argue for the existence of the Majorana fermions necessary to
remove the SU(2) anomalous action. The fate of the majoron and the
spontaneously broken lepton number is discussed. We also show the compatibility
of the boson and fermion mixings with Dyson-Schwinger equations.
| [
{
"created": "Thu, 5 Jun 1997 12:05:09 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Apr 2013 10:52:31 GMT",
"version": "v2"
}
] | 2013-04-03 | [
[
"Palle",
"Davor",
"",
"Rugjer Boskovic Institute, Zagreb, Hrvatska"
]
] | Relationships between gauge, conformal and discrete symmetries in particle physics are analysed. We study also the effect of the electroweak mixing on the cancellation of SU(2) anomalous actions. It is shown that the relation theta_{W} = 2(theta_{12}+theta_{23}+theta_{13}) between the Weinberg angle and the Cabibbo-Kobayashi-Maskawa angles should be satisfied and this effect is completely defined by the mixing of Dirac fermions. We compare two mechanisms of the spontaneous breaking of gauge symmetry, discuss the renormalizability of theories, and argue for the existence of the Majorana fermions necessary to remove the SU(2) anomalous action. The fate of the majoron and the spontaneously broken lepton number is discussed. We also show the compatibility of the boson and fermion mixings with Dyson-Schwinger equations. |
1302.6302 | Xiao-Gang He | Xiao-Gang He, Siao-Fong Li, Hsiu-Hsien Lin | Further Studies of Higgs Properties at An ILC $\gamma\gamma$ Collider | RevTex 9 pages with 4 figures | null | 10.1142/S0217732313500855 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently the ATLAS and CMS experiments at the LHC have found a Higgs like
boson $h$ with a mass around 125 GeV from several decay modes. The decay mode
$h \to \gamma\gamma$ is one of the most important modes in studying whether $h$
is actually the standard model (SM) Higgs boson. Current data indicate that
$h\to \gamma\gamma$ has a branching ratio larger than the SM prediction for $h$
being identified as the SM Higgs boson. To decide whether the $h$ discovered at
the LHC is the SM Higgs boson, more data are needed. We study how
$\gamma\gamma$ collider can help to provide some of the most important
information about the Higgs boson properties. We show that a $\gamma\gamma$
collider can easily verify whether the enhanced $h \to \gamma\gamma$ observed
at the LHC hold. Different models can be tested by studying Higgs boson decay
to $\gamma Z$. Studying angular distribution of the $\gamma \gamma$ through
on-shell production of $h$ and its subsequent decays into a $\gamma \gamma$
pair can decide whether the Higgs like boson $h$ at the LHC is a spin-0 or a
spin-2 boson.
| [
{
"created": "Tue, 26 Feb 2013 03:31:00 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"He",
"Xiao-Gang",
""
],
[
"Li",
"Siao-Fong",
""
],
[
"Lin",
"Hsiu-Hsien",
""
]
] | Recently the ATLAS and CMS experiments at the LHC have found a Higgs like boson $h$ with a mass around 125 GeV from several decay modes. The decay mode $h \to \gamma\gamma$ is one of the most important modes in studying whether $h$ is actually the standard model (SM) Higgs boson. Current data indicate that $h\to \gamma\gamma$ has a branching ratio larger than the SM prediction for $h$ being identified as the SM Higgs boson. To decide whether the $h$ discovered at the LHC is the SM Higgs boson, more data are needed. We study how $\gamma\gamma$ collider can help to provide some of the most important information about the Higgs boson properties. We show that a $\gamma\gamma$ collider can easily verify whether the enhanced $h \to \gamma\gamma$ observed at the LHC hold. Different models can be tested by studying Higgs boson decay to $\gamma Z$. Studying angular distribution of the $\gamma \gamma$ through on-shell production of $h$ and its subsequent decays into a $\gamma \gamma$ pair can decide whether the Higgs like boson $h$ at the LHC is a spin-0 or a spin-2 boson. |
hep-ph/9302214 | null | M.N. Butler, M.J. Savage, and R.P. Springer | E2/M1 Mixing Ratio of $\Delta\to N\gamma$ and Hyperon Resonance
Radiative Decay | Uses harvmac.tex. 9 pages with 2 PostScript figures, packed and
included using uufiles and figure. UCSD/PTH 93-04, QUSTH-93-01, Duke-TH-93-47 | Phys.Lett. B304 (1993) 353-358 | 10.1016/0370-2693(93)90308-5 | null | hep-ph nucl-th | null | We compute the leading contribution to the E2/M1 mixing ratio of the decay
$\Delta\rightarrow N\gamma$ in heavy baryon chiral perturbation theory. We find
the mixing ratio to be $4\% \ltap |\delta_{\rm E2/M1}| \ltap 11\%$, much larger
than estimates based on the quark model and other hadronic models. We also
compute the mixing ratio for the radiative decay of the hyperon resonances. The
decays $\Sigma^{*+}\rightarrow\Sigma^+\gamma$ and
$\Xi^{*-}\rightarrow\Xi^-\gamma$ provide a particularly sensitive probe of
deviations from heavy baryon spin-flavour SU(6).
| [
{
"created": "Wed, 3 Feb 1993 22:02:49 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Butler",
"M. N.",
""
],
[
"Savage",
"M. J.",
""
],
[
"Springer",
"R. P.",
""
]
] | We compute the leading contribution to the E2/M1 mixing ratio of the decay $\Delta\rightarrow N\gamma$ in heavy baryon chiral perturbation theory. We find the mixing ratio to be $4\% \ltap |\delta_{\rm E2/M1}| \ltap 11\%$, much larger than estimates based on the quark model and other hadronic models. We also compute the mixing ratio for the radiative decay of the hyperon resonances. The decays $\Sigma^{*+}\rightarrow\Sigma^+\gamma$ and $\Xi^{*-}\rightarrow\Xi^-\gamma$ provide a particularly sensitive probe of deviations from heavy baryon spin-flavour SU(6). |
2303.02852 | Jinwei Wang | Sudhakantha Girmohanta, Yu-Cheng Qiu, Jin-Wei Wang, and Tsutomu T.
Yanagida | Model of the quintessence axion | 5 pages, 1 appendix; published on PRD | null | 10.1103/PhysRevD.108.015028 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a model of the quintessence axion based on a gauged chiral
$U(1)$ symmetry and an additional flat fifth dimension. The required high
qualities are guaranteed by the brane separation. The observed cosmological
constant (i.e., the potential energy of the quintessence axion) is determined
by the size of the extra dimension and the axion decay constant $F_a$ is fixed
almost at $F_a\simeq10^{17}\,{\rm GeV}$, which is sufficiently large for the
stability of the axion field near the hilltop of its potential. Furthermore,
the movement of the axion can also easily explain the recently reported
isotropic cosmic birefringence of the cosmic microwave background photon.
| [
{
"created": "Mon, 6 Mar 2023 03:13:48 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jul 2023 07:44:53 GMT",
"version": "v2"
}
] | 2023-07-26 | [
[
"Girmohanta",
"Sudhakantha",
""
],
[
"Qiu",
"Yu-Cheng",
""
],
[
"Wang",
"Jin-Wei",
""
],
[
"Yanagida",
"Tsutomu T.",
""
]
] | We construct a model of the quintessence axion based on a gauged chiral $U(1)$ symmetry and an additional flat fifth dimension. The required high qualities are guaranteed by the brane separation. The observed cosmological constant (i.e., the potential energy of the quintessence axion) is determined by the size of the extra dimension and the axion decay constant $F_a$ is fixed almost at $F_a\simeq10^{17}\,{\rm GeV}$, which is sufficiently large for the stability of the axion field near the hilltop of its potential. Furthermore, the movement of the axion can also easily explain the recently reported isotropic cosmic birefringence of the cosmic microwave background photon. |
2403.17449 | Vadim Guzey | V. Guzey (Jyvaskyla U. and Helsinki Inst. of Phys.) | Inclusive and diffractive dijet photoproduction in ultraperipheral Pb-Pb
collisions at the LHC | 9 pages, 6 figures. Contains some updated results compared to
published ones. Contribution to Proc. of 1st International Workshop on the
physics of Ultra Peripheral Collisions (UPC 2023) | null | null | null | hep-ph hep-ex nucl-ex | http://creativecommons.org/licenses/by/4.0/ | In this contribution, we summarize NLO pQCD predictions for inclusive and
diffractive dijet photoproduction in Pb-Pb UPCs at the LHC. We demonstrate that
the theory describes well the preliminary ATLAS data on the inclusive cross
section, which probes nuclear parton distributions (PDFs) down to $x_A \approx
0.005$ and which can reduce current uncertainties of the small-$x$ nuclear
gluon distribution by approximately a factor of 2. Employing predictions of the
leading twist approach to nuclear shadowing for nuclear diffractive PDFs, we
calculate the cross section of diffractive dijet photoproduction and show that
its $x_{\gamma}$ dependence is sensitive to the effect of nuclear shadowing and
the mechanism of QCD factorization breaking in hard diffraction. We also find
that due to large leading twist nuclear shadowing and restricted kinematics,
the diffractive contribution to the inclusive cross section of dijet
photoproduction does not exceed $5-10$%, which helps with an ambiguous
interpretation of the ATLAS data.
| [
{
"created": "Tue, 26 Mar 2024 07:27:33 GMT",
"version": "v1"
}
] | 2024-03-27 | [
[
"Guzey",
"V.",
"",
"Jyvaskyla U. and Helsinki Inst. of Phys."
]
] | In this contribution, we summarize NLO pQCD predictions for inclusive and diffractive dijet photoproduction in Pb-Pb UPCs at the LHC. We demonstrate that the theory describes well the preliminary ATLAS data on the inclusive cross section, which probes nuclear parton distributions (PDFs) down to $x_A \approx 0.005$ and which can reduce current uncertainties of the small-$x$ nuclear gluon distribution by approximately a factor of 2. Employing predictions of the leading twist approach to nuclear shadowing for nuclear diffractive PDFs, we calculate the cross section of diffractive dijet photoproduction and show that its $x_{\gamma}$ dependence is sensitive to the effect of nuclear shadowing and the mechanism of QCD factorization breaking in hard diffraction. We also find that due to large leading twist nuclear shadowing and restricted kinematics, the diffractive contribution to the inclusive cross section of dijet photoproduction does not exceed $5-10$%, which helps with an ambiguous interpretation of the ATLAS data. |
1311.4542 | Jeff Asaf Dror | Jeff Asaf Dror and Yuval Grossman | Angular Distributions as Lifetime Probes | 18 pages, 5 figures, JHEP version | null | 10.1007/JHEP06(2014)171 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If new TeV scale particles are discovered, it will be important to determine
their width. There is, however, a problematic region, where the width is too
small to be determined directly, and too large to generate a secondary vertex.
For a collection of colored, spin polarized particles, hadronization
depolarizes the particles prior to their decay. The amount of depolarization
can be used to probe the lifetime in the problematic region. In this paper we
apply this method to a realistic scenario of a top-like particle that can be
produced at the LHC. We study how depolarization affects the angular
distributions of the decay products and derive an equation for the
distributions that is sensitive to the lifetime.
| [
{
"created": "Mon, 18 Nov 2013 21:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Feb 2014 10:43:23 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Jul 2014 11:25:10 GMT",
"version": "v3"
}
] | 2014-07-02 | [
[
"Dror",
"Jeff Asaf",
""
],
[
"Grossman",
"Yuval",
""
]
] | If new TeV scale particles are discovered, it will be important to determine their width. There is, however, a problematic region, where the width is too small to be determined directly, and too large to generate a secondary vertex. For a collection of colored, spin polarized particles, hadronization depolarizes the particles prior to their decay. The amount of depolarization can be used to probe the lifetime in the problematic region. In this paper we apply this method to a realistic scenario of a top-like particle that can be produced at the LHC. We study how depolarization affects the angular distributions of the decay products and derive an equation for the distributions that is sensitive to the lifetime. |
hep-ph/9511250 | Janusz Rosiek | Janusz Rosiek | Complete set of Feynman rules for the MSSM -- ERRATUM | 46 pages, uses axodraw.sty. This is the "integrated" version of the
erratum, i.e. full text of the paper with errors corrected | null | 10.1103/PhysRevD.41.3464 | KA-TP-8-1995 | hep-ph | null | This erratum contains the full corrected version of the paper {\em Complete
set of Feynman rules for the Minimal Supersymmetric Standard Model}, published
in Phys. Rev. D41 (3464) 1990. The complete set of Feynman rules for the
R-parity conserving MSSM is listed, including the most general form of flavour
mixing. Propagators and vertices are computed in t'Hooft-Feynman gauge,
convenient for perturbative calculations beyond the tree level.
| [
{
"created": "Mon, 6 Nov 1995 16:12:24 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Jul 1998 13:28:55 GMT",
"version": "v2"
},
{
"created": "Mon, 23 Sep 2002 12:32:13 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Rosiek",
"Janusz",
""
]
] | This erratum contains the full corrected version of the paper {\em Complete set of Feynman rules for the Minimal Supersymmetric Standard Model}, published in Phys. Rev. D41 (3464) 1990. The complete set of Feynman rules for the R-parity conserving MSSM is listed, including the most general form of flavour mixing. Propagators and vertices are computed in t'Hooft-Feynman gauge, convenient for perturbative calculations beyond the tree level. |
1008.1632 | Nicholas Setzer | T. Gherghetta and N. Setzer | On the stability of a soft-wall model | 17 pages, 1 figure; references added | Phys.Rev.D82:075009,2010 | 10.1103/PhysRevD.82.075009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the stability and fluctuations of a soft wall model that has
an asymptotically AdS metric and a scalar field that has an asymptotically
power-law dependence in the conformal coordinate. By imposing UV boundary
conditions, the soft wall mass scale can be fixed to be near the TeV scale and
causes the radion to no longer be massless. A hierarchy between the weak scale
and the Planck scale can be generated for various particle spectrum behavior,
although natural values only occur for a gravitational sector containing scalar
fields that act like unparticles. In addition, if bulk Standard Model fields
have nonstandard couplings to the gravitational sector, then a discrete
particle spectrum can be realized in the nongravitational sector. This allows
for the possibility of an unparticle solution to the hierarchy problem.
| [
{
"created": "Tue, 10 Aug 2010 05:02:38 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Oct 2010 09:06:03 GMT",
"version": "v2"
}
] | 2014-11-21 | [
[
"Gherghetta",
"T.",
""
],
[
"Setzer",
"N.",
""
]
] | We investigate the stability and fluctuations of a soft wall model that has an asymptotically AdS metric and a scalar field that has an asymptotically power-law dependence in the conformal coordinate. By imposing UV boundary conditions, the soft wall mass scale can be fixed to be near the TeV scale and causes the radion to no longer be massless. A hierarchy between the weak scale and the Planck scale can be generated for various particle spectrum behavior, although natural values only occur for a gravitational sector containing scalar fields that act like unparticles. In addition, if bulk Standard Model fields have nonstandard couplings to the gravitational sector, then a discrete particle spectrum can be realized in the nongravitational sector. This allows for the possibility of an unparticle solution to the hierarchy problem. |
hep-ph/0210260 | Per Osland | R. Gastmans (Leuven), Per Osland (Bergen), Tai Tsun Wu (Harvard, CERN) | Neutrino masses from universal Fermion mixing | 27 pages, LaTeX, including several figures | Phys.Rev. D67 (2003) 053005 | 10.1103/PhysRevD.67.053005 | CERN-TH/2002-202; KUL-TF-02/20 | hep-ph | null | If three right-handed neutrinos are added to the Standard Model, then, for
the three known generations, there are six quarks and six leptons. It is then
natural to assume that the symmetry considerations that have been applied to
the quark matrices are also valid for the lepton mass matrices. Under this
assumption, the solar and atmospheric neutrino data can be used to determine
the individual neutrino masses. Using the \chi^2 fit, it is found that the mass
of the lightest neutrino is (2-5)\times10^{-3} eV, that of the next heavier
neutrino is (10-13)\times10^{-3} eV, while the mass of the heaviest neutrino is
(52-54)\times10^{-3} eV.
| [
{
"created": "Fri, 18 Oct 2002 07:16:15 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Gastmans",
"R.",
"",
"Leuven"
],
[
"Osland",
"Per",
"",
"Bergen"
],
[
"Wu",
"Tai Tsun",
"",
"Harvard, CERN"
]
] | If three right-handed neutrinos are added to the Standard Model, then, for the three known generations, there are six quarks and six leptons. It is then natural to assume that the symmetry considerations that have been applied to the quark matrices are also valid for the lepton mass matrices. Under this assumption, the solar and atmospheric neutrino data can be used to determine the individual neutrino masses. Using the \chi^2 fit, it is found that the mass of the lightest neutrino is (2-5)\times10^{-3} eV, that of the next heavier neutrino is (10-13)\times10^{-3} eV, while the mass of the heaviest neutrino is (52-54)\times10^{-3} eV. |
1405.6389 | Martin Jung | Martin Jung | The Electron EDM and EDMs in Two-Higgs-Doublet Models | Contribution to the proceedings of Recontres de Moriond EW 2014. 6
pages, 3 figures | null | null | DO-TH 14/09 | hep-ph physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Electric dipole moments constitute highly sensitive probes for CP-violating
effects beyond the Standard Model. The upper limits obtained in various
precision experiments can therefore be used to strongly restrict new physics
models. However, relating the experimental information to parameters of a
specific model is complicated by the presence of various sources for EDMs as
well as large theory uncertainties in some of the relevant matrix elements. In
this article, we address both issues for the EDMs of heavy paramagnetic
systems, where it is possible to include subleading contributions, thereby
model-independently extracting the electron EDM. We furthermore use expressions
for the presently phenomenologically relevant EDMs with conservative estimates
for the theoretical uncertainties to place constraints on CP-violating phases
in the context of Two-Higgs-Doublet models.
| [
{
"created": "Sun, 25 May 2014 13:53:28 GMT",
"version": "v1"
}
] | 2014-05-27 | [
[
"Jung",
"Martin",
""
]
] | Electric dipole moments constitute highly sensitive probes for CP-violating effects beyond the Standard Model. The upper limits obtained in various precision experiments can therefore be used to strongly restrict new physics models. However, relating the experimental information to parameters of a specific model is complicated by the presence of various sources for EDMs as well as large theory uncertainties in some of the relevant matrix elements. In this article, we address both issues for the EDMs of heavy paramagnetic systems, where it is possible to include subleading contributions, thereby model-independently extracting the electron EDM. We furthermore use expressions for the presently phenomenologically relevant EDMs with conservative estimates for the theoretical uncertainties to place constraints on CP-violating phases in the context of Two-Higgs-Doublet models. |
2309.08407 | Mingqiu Li | Mingqiu Li, Sichun Sun, Qi-Shu Yan, Zhijie Zhao | Gravitational waves from axion wave production | 20 pages, 6 figures | null | null | null | hep-ph astro-ph.CO gr-qc | http://creativecommons.org/licenses/by/4.0/ | We consider a scenario with axions/axion-like particles Chern-Simons gravity
coupling, such that gravitational waves can be produced directly from axion
wave parametric resonance in the early universe after inflation. This axion
gravity term is less constrained compared to the well-searched axion photon
coupling and can provide a direct and efficient production channel for
gravitational waves. Such stochastic gravitational waves can be detected by
either space/ground-based gravitational wave detectors or pulsar timing arrays
for a broad range of axion masses and decay constants.
| [
{
"created": "Fri, 15 Sep 2023 14:08:53 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Apr 2024 08:12:40 GMT",
"version": "v2"
}
] | 2024-04-09 | [
[
"Li",
"Mingqiu",
""
],
[
"Sun",
"Sichun",
""
],
[
"Yan",
"Qi-Shu",
""
],
[
"Zhao",
"Zhijie",
""
]
] | We consider a scenario with axions/axion-like particles Chern-Simons gravity coupling, such that gravitational waves can be produced directly from axion wave parametric resonance in the early universe after inflation. This axion gravity term is less constrained compared to the well-searched axion photon coupling and can provide a direct and efficient production channel for gravitational waves. Such stochastic gravitational waves can be detected by either space/ground-based gravitational wave detectors or pulsar timing arrays for a broad range of axion masses and decay constants. |
1402.2844 | Gino Isidori | Gino Isidori, Frederic Teubert | Status of indirect searches for New Physics with heavy flavour decays
after the initial LHC run | Invited review based on talks presented at the Open Symposium on the
European Strategy for Particle Physics (Krakow, Sept. 2012). arXiv admin
note: text overlap with arXiv:1302.0661 (v2: few refs. updated) | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a status report on the indirect searches for New Physics performed
by means of heavy flavour decays. Particular attention is devoted to the recent
experimental results in B and charm physics obtained by the LHC experiments.
The implications of these results for physics beyond the Standard Model are
discussed both in general terms and by means of a few specific examples.
| [
{
"created": "Wed, 12 Feb 2014 15:11:45 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Apr 2014 09:01:42 GMT",
"version": "v2"
}
] | 2014-04-29 | [
[
"Isidori",
"Gino",
""
],
[
"Teubert",
"Frederic",
""
]
] | We present a status report on the indirect searches for New Physics performed by means of heavy flavour decays. Particular attention is devoted to the recent experimental results in B and charm physics obtained by the LHC experiments. The implications of these results for physics beyond the Standard Model are discussed both in general terms and by means of a few specific examples. |
2301.10247 | Zamir Heller-Algazi | Csaba Cs\'aki, Michael Geller, Zamir Heller-Algazi and Ameen Ismail | Relevant Dilaton Stabilization | null | null | 10.1007/JHEP06(2023)202 | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We propose a simple modification of the Goldberger-Wise mechanism for
stabilizing the scale of spontaneously broken conformal theories. The source of
explicit conformal symmetry breaking is a relevant operator with a small
coefficient, as opposed to the usual mechanism of an almost marginal operator
with an order-one coefficient. In the warped 5D picture this relevant
stabilization corresponds to a small tadpole for the bulk scalar on the UV
brane, which can be technically natural if it is the only source for the
breaking of a symmetry (for example, a discrete $Z_2$). This modification of
the stabilization mechanism has significant consequences for the nature of the
conformal phase transition, since the radion/dilaton potential is no longer
shallow. The bounce action is significantly reduced, leading to a weaker
first-order phase transition instead of the supercooled and strongly
first-order transition seen in Goldberger-Wise stabilization. This also leads
to reduction of gravitational wave signals which, however, may still be
observable at future detectors. We present numerical and analytical studies of
the phase transition and the resulting gravitational wave signal strength,
assuming that the effective dilaton potential provides a good leading
approximation. While the dilaton is not expected to be generically light in
this setup, in order to keep perturbative control over the effective theory one
needs to mildly tune the dilaton quartic to be somewhat small.
| [
{
"created": "Tue, 24 Jan 2023 19:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jul 2023 10:58:26 GMT",
"version": "v2"
}
] | 2023-07-26 | [
[
"Csáki",
"Csaba",
""
],
[
"Geller",
"Michael",
""
],
[
"Heller-Algazi",
"Zamir",
""
],
[
"Ismail",
"Ameen",
""
]
] | We propose a simple modification of the Goldberger-Wise mechanism for stabilizing the scale of spontaneously broken conformal theories. The source of explicit conformal symmetry breaking is a relevant operator with a small coefficient, as opposed to the usual mechanism of an almost marginal operator with an order-one coefficient. In the warped 5D picture this relevant stabilization corresponds to a small tadpole for the bulk scalar on the UV brane, which can be technically natural if it is the only source for the breaking of a symmetry (for example, a discrete $Z_2$). This modification of the stabilization mechanism has significant consequences for the nature of the conformal phase transition, since the radion/dilaton potential is no longer shallow. The bounce action is significantly reduced, leading to a weaker first-order phase transition instead of the supercooled and strongly first-order transition seen in Goldberger-Wise stabilization. This also leads to reduction of gravitational wave signals which, however, may still be observable at future detectors. We present numerical and analytical studies of the phase transition and the resulting gravitational wave signal strength, assuming that the effective dilaton potential provides a good leading approximation. While the dilaton is not expected to be generically light in this setup, in order to keep perturbative control over the effective theory one needs to mildly tune the dilaton quartic to be somewhat small. |
hep-ph/9607472 | Aleksander Sidorov | D.V. Shirkov, A.V. Sidorov and S.V. Mikhailov (Joint Institute for
Nuclear Research, Dubna, Russia) | Continuous mass-dependent analysis of the non--singlet DIS data | LaTeX, 16 pages. Note Added in Proof | null | null | JINR E2-96-285 | hep-ph | null | We consider the issue of an accurate description of the evolution of the
non-singlet structure function moments $M_n(Q)$ near heavy quark threshold. To
this aim we propose a simple modification of the standard massless \MSbar
scheme approach to the next-to-leading QCD analysis of DIS data. We apply it to
the processing of the modern CCFR data for $xF_3$ structure function and
extract the value of $\alpha_s(M_z) \approx 0.108 \pm 0.004$ We check also the
consistency of light gluino hypothesis with CCFR data.
| [
{
"created": "Wed, 31 Jul 1996 10:28:21 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Sep 1996 18:06:44 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Shirkov",
"D. V.",
"",
"Joint Institute for\n Nuclear Research, Dubna, Russia"
],
[
"Sidorov",
"A. V.",
"",
"Joint Institute for\n Nuclear Research, Dubna, Russia"
],
[
"Mikhailov",
"S. V.",
"",
"Joint Institute for\n Nuclear Research, Dubna, Russia"
]
] | We consider the issue of an accurate description of the evolution of the non-singlet structure function moments $M_n(Q)$ near heavy quark threshold. To this aim we propose a simple modification of the standard massless \MSbar scheme approach to the next-to-leading QCD analysis of DIS data. We apply it to the processing of the modern CCFR data for $xF_3$ structure function and extract the value of $\alpha_s(M_z) \approx 0.108 \pm 0.004$ We check also the consistency of light gluino hypothesis with CCFR data. |
1001.3123 | Anna Kulesza | W. Beenakker, S. Brensing, M. Kraemer, A. Kulesza, E. Laenen, L.
Motyka and I. Niessen | Soft gluon resummation for squark and gluino pair-production at hadron
colliders | 6 pages, talk given at RADCOR 2009 - 9th International Symposium on
Radiative Corrections (Applications of Quantum Field Theory to Phenomenology)
October 25-30 2009, Ascona, Switzerland | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on the study of soft gluon effects in the production of squarks and
gluinos at hadron colliders. Close to production threshold, the emission of
soft gluon results in the appearence of large logarithmic corrections in the
theoretical expressions. In order to resum these corrections at
next-to-leading-logarithmic accuracy appropriate one-loop anomalous dimensions
have to be calculated. We present the calculation of the anomalous dimensions
for all production channels of squarks and gluinos and provide numerical
predictions for the Tevatron and the LHC.
| [
{
"created": "Mon, 18 Jan 2010 19:18:09 GMT",
"version": "v1"
}
] | 2010-01-19 | [
[
"Beenakker",
"W.",
""
],
[
"Brensing",
"S.",
""
],
[
"Kraemer",
"M.",
""
],
[
"Kulesza",
"A.",
""
],
[
"Laenen",
"E.",
""
],
[
"Motyka",
"L.",
""
],
[
"Niessen",
"I.",
""
]
] | We report on the study of soft gluon effects in the production of squarks and gluinos at hadron colliders. Close to production threshold, the emission of soft gluon results in the appearence of large logarithmic corrections in the theoretical expressions. In order to resum these corrections at next-to-leading-logarithmic accuracy appropriate one-loop anomalous dimensions have to be calculated. We present the calculation of the anomalous dimensions for all production channels of squarks and gluinos and provide numerical predictions for the Tevatron and the LHC. |
1908.02866 | Aleksas Mazeliauskas | Giuliano Giacalone, Aleksas Mazeliauskas and S\"oren Schlichting | Hydrodynamic attractors, initial state energy and particle production in
relativistic nuclear collisions | 7 pages, 3 figures; v2: minor corrections, published version, plot
scripts and data shown in figures are available at
https://doi.org/10.4119/unibi/2939684 v3: included supplemental material | Phys. Rev. Lett. 123, 262301 (2019) | 10.1103/PhysRevLett.123.262301 | INT-PUB-19-036 | hep-ph nucl-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | We exploit the concept of hydrodynamic attractors to establish a general
relation between the initial state energy and the produced particle
multiplicities in high-energy nuclear collisions. When combined with an ab
initio model of energy deposition, the entropy production during the
pre-equilibrium phase naturally explains the universal centrality dependence of
the measured charged particle yields in nucleus-nucleus collisions. We further
estimate the energy density of the far-from-equilibrium initial state and
discuss how our results can be used to constrain non-equilibrium properties of
the quark-gluon plasma.
| [
{
"created": "Wed, 7 Aug 2019 23:02:32 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jan 2020 09:56:47 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Dec 2020 09:22:19 GMT",
"version": "v3"
}
] | 2021-01-01 | [
[
"Giacalone",
"Giuliano",
""
],
[
"Mazeliauskas",
"Aleksas",
""
],
[
"Schlichting",
"Sören",
""
]
] | We exploit the concept of hydrodynamic attractors to establish a general relation between the initial state energy and the produced particle multiplicities in high-energy nuclear collisions. When combined with an ab initio model of energy deposition, the entropy production during the pre-equilibrium phase naturally explains the universal centrality dependence of the measured charged particle yields in nucleus-nucleus collisions. We further estimate the energy density of the far-from-equilibrium initial state and discuss how our results can be used to constrain non-equilibrium properties of the quark-gluon plasma. |
0710.1585 | Walter Grimus | W. Grimus, H. Kuhbock | Embedding the Zee-Wolfenstein neutrino mass matrix in an SO(10) x A4 GUT
scenario | 19 pages, 3 figures, v2: final version for Phys. Rev. D | Phys.Rev.D77:055008,2008 | 10.1103/PhysRevD.77.055008 | UWThPh-2007-21 | hep-ph | null | We consider renormalizable SO(10) Yukawa interactions and put the three
fermionic 16-plets into the 3-dimensional irreducible A_4 representation.
Scanning the possible A_4 representation assignments to the scalars, we find a
unique case which allows to accommodate the down-quark and charged-lepton
masses. Assuming type II seesaw dominance, we obtain a viable scenario with the
Zee-Wolfenstein neutrino mass matrix, i.e., the Majorana mass matrix with a
vanishing diagonal. Contributions from the charged-lepton mass matrix resolve
the well-known problems with lepton mixing arising from the vanishing diagonal.
In our scenario, fermion masses and mixings are well reproduced for both normal
and inverted neutrino mass spectra, and b-tau Yukawa unification and definite
predictions for the effective mass in neutrinoless double-beta decay are
obtained.
| [
{
"created": "Mon, 8 Oct 2007 16:35:56 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Feb 2008 12:30:25 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Grimus",
"W.",
""
],
[
"Kuhbock",
"H.",
""
]
] | We consider renormalizable SO(10) Yukawa interactions and put the three fermionic 16-plets into the 3-dimensional irreducible A_4 representation. Scanning the possible A_4 representation assignments to the scalars, we find a unique case which allows to accommodate the down-quark and charged-lepton masses. Assuming type II seesaw dominance, we obtain a viable scenario with the Zee-Wolfenstein neutrino mass matrix, i.e., the Majorana mass matrix with a vanishing diagonal. Contributions from the charged-lepton mass matrix resolve the well-known problems with lepton mixing arising from the vanishing diagonal. In our scenario, fermion masses and mixings are well reproduced for both normal and inverted neutrino mass spectra, and b-tau Yukawa unification and definite predictions for the effective mass in neutrinoless double-beta decay are obtained. |
1511.00870 | Tetsuo Hyodo | Tetsuo Hyodo | Compositeness of Hadrons and Near-Threshold Dynamics | 9 pages, talk given at The 10th International Workshop on the Physics
of Excited Nucleons (NSTAR2015) May 25-28, 2015, Osaka, Japan, to appear in
JPS Conf. Proc | null | 10.7566/JPSCP.10.021001 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the recent developments in the studies of the structure of hadron
resonances, focusing on the compositeness in terms of the hadronic degrees of
freedom. We discuss the model dependence of the compositeness, and show that
the structure of the near-threshold bound states and resonances is
model-independently determined. The applications to various hadrons are
summarized.
| [
{
"created": "Tue, 3 Nov 2015 12:08:24 GMT",
"version": "v1"
}
] | 2016-06-22 | [
[
"Hyodo",
"Tetsuo",
""
]
] | We present the recent developments in the studies of the structure of hadron resonances, focusing on the compositeness in terms of the hadronic degrees of freedom. We discuss the model dependence of the compositeness, and show that the structure of the near-threshold bound states and resonances is model-independently determined. The applications to various hadrons are summarized. |
2102.13206 | Salvatore Marco Giampaolo | Antonio Capolupo, Salvatore Marco Giampaolo, Aniello Quaranta | Neutron Interferometry and axion like particles | 5 pages, 4 figures | Eur. Phys. J. C (2021) 81: 1116 | 10.1140/epjc/s10052-021-09888-x | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We propose a method to reveal axions and axion-like particles based on
interferometric measurement of neutron beams. We consider an interferometer in
which the neutron beam is split in two sub-beams propagating in regions with
differently oriented magnetic fields. The beam paths and the strength of the
magnetic fields are set in such a way that all the contributions to the phase
difference but the one due to axion-induced interactions are removed. The
resulting phase difference is directly related to the presence of axions. Our
results show that such a phase is in principle detectable with neutron
interferometry, possibly proving the existence of axions and axion-like
particles.
| [
{
"created": "Tue, 23 Feb 2021 19:00:03 GMT",
"version": "v1"
}
] | 2022-06-14 | [
[
"Capolupo",
"Antonio",
""
],
[
"Giampaolo",
"Salvatore Marco",
""
],
[
"Quaranta",
"Aniello",
""
]
] | We propose a method to reveal axions and axion-like particles based on interferometric measurement of neutron beams. We consider an interferometer in which the neutron beam is split in two sub-beams propagating in regions with differently oriented magnetic fields. The beam paths and the strength of the magnetic fields are set in such a way that all the contributions to the phase difference but the one due to axion-induced interactions are removed. The resulting phase difference is directly related to the presence of axions. Our results show that such a phase is in principle detectable with neutron interferometry, possibly proving the existence of axions and axion-like particles. |
1502.05005 | Zhijin Li | Tianjun Li, Zhijin Li, Dimitri V. Nanopoulos | Symmetry Breaking Indication for Supergravity Inflation in Light of the
Planck 2015 | 20 pages, 10 figures, references added | null | 10.1088/1475-7516/2015/09/006 | ACT-01-15, MI-TH-1506 | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The supergravity (SUGRA) theories with exact global $U(1)$ symmetry or shift
symmetry in K\"ahler potential provide the natural frameworks for inflation.
However, the quadratic inflation is disfavoured by the new results on
primordial tensor fluctuations from the Planck Collaboration. To be consistent
with the new Planck data, we point out that the explicit symmetry breaking is
needed, and study these two SUGRA inflation in details. For the SUGRA inflation
with global $U(1)$ symmetry, the symmetry breaking term leads to a
trigonometric modulation on inflaton potential. The coefficient of the $U(1)$
symmetry breaking term is of the order $10^{-2}$, which is sufficient large to
improve the inflationary predictions while its higher order corrections are
negligible. Such models predict sizeable tensor fluctuations and highly agree
with the Planck results. In particular, the model with a linear $U(1)$ symmetry
breaking term predicts the tensor-to-scalar ratio around $\textbf{r}\sim0.01$
and running spectral index $\alpha_s\sim-0.004$, which comfortably fit with the
Planck observations. For the SUGRA inflation with breaking shift symmetry, the
inflaton potential is modulated by an exponential factor. The modulated linear
and quadratic models are consistent with the Planck observations. In both kinds
of models the tensor-to-scalar ratio can be of the order $10^{-2}$, which will
be tested by the near future observations.
| [
{
"created": "Tue, 17 Feb 2015 19:04:09 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Feb 2015 17:48:00 GMT",
"version": "v2"
}
] | 2015-09-16 | [
[
"Li",
"Tianjun",
""
],
[
"Li",
"Zhijin",
""
],
[
"Nanopoulos",
"Dimitri V.",
""
]
] | The supergravity (SUGRA) theories with exact global $U(1)$ symmetry or shift symmetry in K\"ahler potential provide the natural frameworks for inflation. However, the quadratic inflation is disfavoured by the new results on primordial tensor fluctuations from the Planck Collaboration. To be consistent with the new Planck data, we point out that the explicit symmetry breaking is needed, and study these two SUGRA inflation in details. For the SUGRA inflation with global $U(1)$ symmetry, the symmetry breaking term leads to a trigonometric modulation on inflaton potential. The coefficient of the $U(1)$ symmetry breaking term is of the order $10^{-2}$, which is sufficient large to improve the inflationary predictions while its higher order corrections are negligible. Such models predict sizeable tensor fluctuations and highly agree with the Planck results. In particular, the model with a linear $U(1)$ symmetry breaking term predicts the tensor-to-scalar ratio around $\textbf{r}\sim0.01$ and running spectral index $\alpha_s\sim-0.004$, which comfortably fit with the Planck observations. For the SUGRA inflation with breaking shift symmetry, the inflaton potential is modulated by an exponential factor. The modulated linear and quadratic models are consistent with the Planck observations. In both kinds of models the tensor-to-scalar ratio can be of the order $10^{-2}$, which will be tested by the near future observations. |
1709.04452 | Lobsang Dhargyal | Lobsang Dhargyal | Phenomenology of $U(1)_{F}$ extension of inert-doublet model with exotic
scalars and leptons | Very minor typos corrected to "Eur.Phys.J. C78 (2018) no.2, 150" in
section 4 | null | 10.1140/epjc/s10052-018-5641-3 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we will extend the inert-doublet model (IDM) by adding a new
$U(1)_{F}$ gauge symmetry to it, under which, a $Z_{2}$ even scalar
($\phi_{2}$) and $Z_{2}$ odd right handed component of two exotic charged
leptons $(F_{eR},\ F_{\mu R})$, are charged. We also add one $Z_{2}$ even real
scalar ($\phi_{1}$) and one complex scalar ($\phi$), three neutral Majorana
right handed fermions ($N_{1},\ N_{2},\ N_{3}$), two left handed components of
the exotic charged leptons $(F_{eL},\ F_{\mu L})$ as well as $F_{\tau}$ are all
odd under the $Z_{2}$, all of which are not charged under the $U(1)_{F}$. With
these new particles added to the IDM, we have a model which can give two scalar
DM candidates, together they can explain the present DM relic density as well
as the muon (g-2) anomaly simultaneously. Also in this model the neutrino
masses are generated at one loop level. One of the most peculiar feature of
this model is that non-travail solution to the axial gauge anomaly free
conditions lead to the prediction of a stable very heavy partner to the
electron ($F_{e}$), whose present collider limit (14 TeV LHC) on its mass
should be around $m_{F_{e}} \geq$ few TeV.
| [
{
"created": "Wed, 13 Sep 2017 17:55:05 GMT",
"version": "v1"
},
{
"created": "Sun, 28 Jan 2018 16:13:26 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Apr 2018 17:06:07 GMT",
"version": "v3"
}
] | 2018-04-25 | [
[
"Dhargyal",
"Lobsang",
""
]
] | In this work we will extend the inert-doublet model (IDM) by adding a new $U(1)_{F}$ gauge symmetry to it, under which, a $Z_{2}$ even scalar ($\phi_{2}$) and $Z_{2}$ odd right handed component of two exotic charged leptons $(F_{eR},\ F_{\mu R})$, are charged. We also add one $Z_{2}$ even real scalar ($\phi_{1}$) and one complex scalar ($\phi$), three neutral Majorana right handed fermions ($N_{1},\ N_{2},\ N_{3}$), two left handed components of the exotic charged leptons $(F_{eL},\ F_{\mu L})$ as well as $F_{\tau}$ are all odd under the $Z_{2}$, all of which are not charged under the $U(1)_{F}$. With these new particles added to the IDM, we have a model which can give two scalar DM candidates, together they can explain the present DM relic density as well as the muon (g-2) anomaly simultaneously. Also in this model the neutrino masses are generated at one loop level. One of the most peculiar feature of this model is that non-travail solution to the axial gauge anomaly free conditions lead to the prediction of a stable very heavy partner to the electron ($F_{e}$), whose present collider limit (14 TeV LHC) on its mass should be around $m_{F_{e}} \geq$ few TeV. |
1506.03484 | Koji Ishiwata | Koji Ishiwata, Zoltan Ligeti, Mark B. Wise | New Vector-Like Fermions and Flavor Physics | 25 pages, 3 figures, several issues are added, accepted in JHEP | null | 10.1007/JHEP10(2015)027 | CALT-TH 2015-029, KANAZAWA-15-07 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study renormalizable extensions of the standard model that contain
vector-like fermions in a (single) complex representation of the standard model
gauge group. There are 11 models where the vector-like fermions Yukawa couple
to the standard model fermions via the Higgs field. These models do not
introduce additional fine- tunings. They can lead to, and are constrained by, a
number of different flavor- changing processes involving leptons and quarks, as
well as direct searches. An interesting feature of the models with strongly
interacting vector-like fermions is that constraints from neutral meson mixings
(apart from CP violation in neutral kaon mixing) are not sensitive to higher
scales than other flavor-changing neutral-current processes. We identify order
1/(4 pi M)^2 (where M is the vector-like fermion mass) one-loop contributions
to the coefficients of the four-quark operators for meson mixing, that are not
suppressed by standard model quark masses and/or mixing angles.
| [
{
"created": "Wed, 10 Jun 2015 21:18:49 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Sep 2015 02:03:02 GMT",
"version": "v2"
}
] | 2015-10-09 | [
[
"Ishiwata",
"Koji",
""
],
[
"Ligeti",
"Zoltan",
""
],
[
"Wise",
"Mark B.",
""
]
] | We study renormalizable extensions of the standard model that contain vector-like fermions in a (single) complex representation of the standard model gauge group. There are 11 models where the vector-like fermions Yukawa couple to the standard model fermions via the Higgs field. These models do not introduce additional fine- tunings. They can lead to, and are constrained by, a number of different flavor- changing processes involving leptons and quarks, as well as direct searches. An interesting feature of the models with strongly interacting vector-like fermions is that constraints from neutral meson mixings (apart from CP violation in neutral kaon mixing) are not sensitive to higher scales than other flavor-changing neutral-current processes. We identify order 1/(4 pi M)^2 (where M is the vector-like fermion mass) one-loop contributions to the coefficients of the four-quark operators for meson mixing, that are not suppressed by standard model quark masses and/or mixing angles. |
2305.00962 | Francesco Giovanni Celiberto | Francesco Giovanni Celiberto, Alessandro Papa | The high-energy QCD dynamics from Higgs-plus-jet correlations at the FCC | 7 pages, 3 figures. Poster presented by F.G. Celiberto at the FCC
Week 2022, 30 May to 3 June 2022, Campus des Cordeliers - Sorbonne
Universit\'e | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent analyses on high-energy inclusive Higgs-boson rates in proton
collisions via the gluon-fusion channel, matched with the state of-the-art
fixed-order N$^3$LO accuracy, have shown that the impact of high-energy
resummation corrections reaches 10% at the FCC nominal energies. This supports
the statement that electroweak physics at 100 TeV is expected to receive
relevant contributions from small-$x$ physics. In this preliminary study we
present novel predictions for transverse-momentum and rapidity distributions
sensitive to the inclusive emission of a Higgs boson in association with a
light-flavored jet in proton collisions, calculated within the NLL accuracy of
the energy-logarithmic resummation. We highlight how high-energy signals for
this process are already present and visible at current LHC energies, and they
are also sizable at the FCC ones. We come out with the message that the
improvement of fixed-order calculations on Higgs-sensitive QCD distributions is
a core ingredient to reach the precision level in the description of
observables relevant for the Higgs physics at the FCC.
| [
{
"created": "Mon, 1 May 2023 17:51:59 GMT",
"version": "v1"
},
{
"created": "Wed, 10 May 2023 23:18:51 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Jul 2023 11:20:12 GMT",
"version": "v3"
}
] | 2023-07-13 | [
[
"Celiberto",
"Francesco Giovanni",
""
],
[
"Papa",
"Alessandro",
""
]
] | Recent analyses on high-energy inclusive Higgs-boson rates in proton collisions via the gluon-fusion channel, matched with the state of-the-art fixed-order N$^3$LO accuracy, have shown that the impact of high-energy resummation corrections reaches 10% at the FCC nominal energies. This supports the statement that electroweak physics at 100 TeV is expected to receive relevant contributions from small-$x$ physics. In this preliminary study we present novel predictions for transverse-momentum and rapidity distributions sensitive to the inclusive emission of a Higgs boson in association with a light-flavored jet in proton collisions, calculated within the NLL accuracy of the energy-logarithmic resummation. We highlight how high-energy signals for this process are already present and visible at current LHC energies, and they are also sizable at the FCC ones. We come out with the message that the improvement of fixed-order calculations on Higgs-sensitive QCD distributions is a core ingredient to reach the precision level in the description of observables relevant for the Higgs physics at the FCC. |
hep-ph/0612204 | Levent Selbuz | L.Selbuz and Z.Z.Aydin | Top and Bottom Squarks Decays under Cosmological Bounds | 1 text(9 pages)and 8 figures(6 pages). Total 15 pages. Accepted to be
published in Phys.Lett. B | Phys.Lett.B645:228-234,2007 | 10.1016/j.physletb.2006.12.034 | hep-ph/0612204 | hep-ph | null | We investigate the fermionic decays of top squarks tilde t_{1,2} and bottom
squarks tilde b_{1,2}$ in the Minimal Supersymmetric Standard Model with
complex parameters M_1, mu, A_t and A_b . In the analysis we particularly take
into account the cosmological bounds imposed by WMAP data. We plot the CP phase
dependences of stop and sbottom decay widths.
| [
{
"created": "Sun, 17 Dec 2006 09:29:49 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Selbuz",
"L.",
""
],
[
"Aydin",
"Z. Z.",
""
]
] | We investigate the fermionic decays of top squarks tilde t_{1,2} and bottom squarks tilde b_{1,2}$ in the Minimal Supersymmetric Standard Model with complex parameters M_1, mu, A_t and A_b . In the analysis we particularly take into account the cosmological bounds imposed by WMAP data. We plot the CP phase dependences of stop and sbottom decay widths. |
hep-ph/0207337 | S. Descotes | S. Descotes-Genon (Southampton), L. Girlanda (Padova), J. Stern
(Orsay) | Chiral order and fluctuations in multi-flavour QCD | Published version | Eur.Phys.J.C27:115-134,2003 | 10.1140/epjc/s2002-01098-9 | SHEP/02-15, DFPD-02/TH/17, IPNO DR 02-018 | hep-ph | null | Multi-flavour (N_f>=3) Chiral Perturbation Theory (ChPT) may exhibit
instabilities due to vacuum fluctuations of sea q-bar q pairs. Keeping the
fluctuations small would require a very precise fine-tuning of the low-energy
constants L_4 and L_6 to L_4[crit](M_rho) = - 0.51 * 10^(-3), and
L_6[crit](M_rho) = - 0.26 * 10^(-3). A small deviation from these critical
values -- like the one suggested by the phenomenology of OZI-rule violation in
the scalar channel -- is amplified by huge numerical factors inducing large
effects of vacuum fluctuations. This would lead in particular to a strong
N_f-dependence of chiral symmetry breaking and a suppression of multi-flavour
chiral order parameters. A simple resummation is shown to cure the instability
of N_f>=3 ChPT, but it modifies the standard expressions of some O(p^2) and
O(p^4) low-energy parameters in terms of observables. On the other hand, for
r=m_s/m > 15, the two-flavour condensate is not suppressed, due to the
contribution induced by massive vacuum s-bar s pairs. Thanks to the latter, the
standard two-flavour ChPT is protected from multi-flavour instabilities and
could provide a well-defined expansion scheme in powers of non-strange quark
masses.
| [
{
"created": "Mon, 29 Jul 2002 13:01:42 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Nov 2002 17:30:05 GMT",
"version": "v2"
}
] | 2016-09-06 | [
[
"Descotes-Genon",
"S.",
"",
"Southampton"
],
[
"Girlanda",
"L.",
"",
"Padova"
],
[
"Stern",
"J.",
"",
"Orsay"
]
] | Multi-flavour (N_f>=3) Chiral Perturbation Theory (ChPT) may exhibit instabilities due to vacuum fluctuations of sea q-bar q pairs. Keeping the fluctuations small would require a very precise fine-tuning of the low-energy constants L_4 and L_6 to L_4[crit](M_rho) = - 0.51 * 10^(-3), and L_6[crit](M_rho) = - 0.26 * 10^(-3). A small deviation from these critical values -- like the one suggested by the phenomenology of OZI-rule violation in the scalar channel -- is amplified by huge numerical factors inducing large effects of vacuum fluctuations. This would lead in particular to a strong N_f-dependence of chiral symmetry breaking and a suppression of multi-flavour chiral order parameters. A simple resummation is shown to cure the instability of N_f>=3 ChPT, but it modifies the standard expressions of some O(p^2) and O(p^4) low-energy parameters in terms of observables. On the other hand, for r=m_s/m > 15, the two-flavour condensate is not suppressed, due to the contribution induced by massive vacuum s-bar s pairs. Thanks to the latter, the standard two-flavour ChPT is protected from multi-flavour instabilities and could provide a well-defined expansion scheme in powers of non-strange quark masses. |
hep-ph/0211378 | Anjan Joshipura | Anjan S. Joshipura, Saurabh D. Rindani and N. Nimai Singh | Predictive Framework with a Pair of Degenerate Neutrinos at a high scale | 15 pages, including a postscript figure | Nucl.Phys.B660:362-372,2003 | 10.1016/S0550-3213(03)00236-0 | null | hep-ph | null | Radiative generation of the solar scale $\Delta_{\odot}$ is discussed in the
presence of leptonic CP violation. We assume that both the solar scale and
$U_{e3}$ are zero at a high scale and the weak radiative corrections generate
them. It is shown that all leptonic mass matrices satisfying these requirements
lead to a unique prediction $\Delta_{\odot} \cos 2\theta_{\odot}\approx 4
\delta_\tau \sin^2 \theta_A |m_{ee}|^2$ for the solar scale in terms of the
radiative correction parameter $\delta_\tau$, the physical solar (atmospheric)
mixing angles $\theta_{odot} (\theta_A)$ and the Majorana neutrino mass
$m_{ee}$ probed in neutrinoless double beta decay. This relation is independent
of the mixing matrix and CP-violating phases at the high scale. The presence of
CP-violating phases leads to dilution in the solar mixing angle defined at the
high scale. Because of this, bi-maximal mixing pattern at the high energy leads
to large but non-maximal solar mixing in the low-energy theory. An illustrative
model with this feature is discussed.
| [
{
"created": "Mon, 25 Nov 2002 09:10:55 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Joshipura",
"Anjan S.",
""
],
[
"Rindani",
"Saurabh D.",
""
],
[
"Singh",
"N. Nimai",
""
]
] | Radiative generation of the solar scale $\Delta_{\odot}$ is discussed in the presence of leptonic CP violation. We assume that both the solar scale and $U_{e3}$ are zero at a high scale and the weak radiative corrections generate them. It is shown that all leptonic mass matrices satisfying these requirements lead to a unique prediction $\Delta_{\odot} \cos 2\theta_{\odot}\approx 4 \delta_\tau \sin^2 \theta_A |m_{ee}|^2$ for the solar scale in terms of the radiative correction parameter $\delta_\tau$, the physical solar (atmospheric) mixing angles $\theta_{odot} (\theta_A)$ and the Majorana neutrino mass $m_{ee}$ probed in neutrinoless double beta decay. This relation is independent of the mixing matrix and CP-violating phases at the high scale. The presence of CP-violating phases leads to dilution in the solar mixing angle defined at the high scale. Because of this, bi-maximal mixing pattern at the high energy leads to large but non-maximal solar mixing in the low-energy theory. An illustrative model with this feature is discussed. |
hep-ph/0010071 | Stephen C. Davis | Stephen C. Davis | Cosmic Strings and Cooper Pairs | 12 pages | Phys.Lett. B497 (2001) 117-124 | 10.1016/S0370-2693(00)01311-3 | SWAT/267 | hep-ph astro-ph cond-mat.supr-con hep-th | null | It is shown that it is possible for bound fermions on a cosmic string to form
a superconducting state. Due to the attractive force between them, particles
moving in opposite directions along the string form bound pairs. This involves
a similar mechanism to superconductivity in metals at low temperatures. The
method of Gorkov is used to analyse the system. In contrast to the situation in
metals, the unusual properties of the string fermion spectrum allow a massless
Abelian gauge field to provide the required attractive force. This results in
far stronger superconductivity than usual. A massive gauge field can also be
used, in which case the standard results apply.
| [
{
"created": "Sun, 8 Oct 2000 14:42:48 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Davis",
"Stephen C.",
""
]
] | It is shown that it is possible for bound fermions on a cosmic string to form a superconducting state. Due to the attractive force between them, particles moving in opposite directions along the string form bound pairs. This involves a similar mechanism to superconductivity in metals at low temperatures. The method of Gorkov is used to analyse the system. In contrast to the situation in metals, the unusual properties of the string fermion spectrum allow a massless Abelian gauge field to provide the required attractive force. This results in far stronger superconductivity than usual. A massive gauge field can also be used, in which case the standard results apply. |
hep-ph/0208155 | Cristiano B. Mariotto | C. Brenner Mariotto, M.B. Gay Ducati, M.V.T. Machado (Rio Grande do
Sul U.) | Heavy Quark Photoproduction in k_T Factorization Approach | 18 pages, 7 figures, minor changes, references added. Accepted for
publication in Phys. Rev. D | Phys.Rev.D66:114013,2002 | 10.1103/PhysRevD.66.114013 | null | hep-ph | null | We investigate the heavy quark photoproduction based on the k_T factorization
approach, focusing on the results from the saturation model. The deviations in
the results using the unintegrated gluon distribution considering the
saturation model and the derivative of the collinear gluon distribution are
analysed. Total cross sections and p_T distributions are analysed in detail,
setting the deviations between the color dipole approximation and the complete
semihard approach.
| [
{
"created": "Thu, 15 Aug 2002 19:15:11 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Oct 2002 21:59:10 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Mariotto",
"C. Brenner",
"",
"Rio Grande do\n Sul U."
],
[
"Ducati",
"M. B. Gay",
"",
"Rio Grande do\n Sul U."
],
[
"Machado",
"M. V. T.",
"",
"Rio Grande do\n Sul U."
]
] | We investigate the heavy quark photoproduction based on the k_T factorization approach, focusing on the results from the saturation model. The deviations in the results using the unintegrated gluon distribution considering the saturation model and the derivative of the collinear gluon distribution are analysed. Total cross sections and p_T distributions are analysed in detail, setting the deviations between the color dipole approximation and the complete semihard approach. |
1503.03098 | Mark Goodsell | M. Goodsell, K. Nickel and F. Staub | Two-loop Higgs mass calculation from a diagrammatic approach | 24 pages, 5 figures | null | null | BONN-TH-2015-04, CERN-TH-2015-044 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the corrections to the Higgs mass in general theories restricted
to the case of massless gauge bosons (the gaugeless limit). We present analytic
expressions for the two-loop tadpole diagrams, and corresponding expressions
for the zero-momentum limit of the Higgs self energies, equivalent to the
second derivative of the two-loop effective potential. We describe the
implementation in SARAH, which allows an efficient, accurate and rapid
evaluation for generic theories. In the appendix, we provide the expressions
for tadpole diagrams in the case of massive gauge bosons.
| [
{
"created": "Tue, 10 Mar 2015 21:04:14 GMT",
"version": "v1"
}
] | 2015-03-12 | [
[
"Goodsell",
"M.",
""
],
[
"Nickel",
"K.",
""
],
[
"Staub",
"F.",
""
]
] | We calculate the corrections to the Higgs mass in general theories restricted to the case of massless gauge bosons (the gaugeless limit). We present analytic expressions for the two-loop tadpole diagrams, and corresponding expressions for the zero-momentum limit of the Higgs self energies, equivalent to the second derivative of the two-loop effective potential. We describe the implementation in SARAH, which allows an efficient, accurate and rapid evaluation for generic theories. In the appendix, we provide the expressions for tadpole diagrams in the case of massive gauge bosons. |
hep-ph/0008152 | Daniel de Florian | D. de Florian and M. Grazzini (ETH-Zurich) | Next-to-next-to-leading logarithmic corrections at small transverse
momentum in hadronic collisions | LaTeX, 8 pages. Few typos corrected, particularly Eq.(25). Two
references added, to be published in PRL | Phys.Rev.Lett. 85 (2000) 4678-4681 | 10.1103/PhysRevLett.85.4678 | null | hep-ph | null | We study the region of small transverse momenta in qqbar- and gg-initiated
processes with no colored particle detected in the final state. We present the
universal expression of the O(alpha_s^2) logarithmically enhanced contributions
up to next-to-next-to-leading logarithmic accuracy. From there we extract the
coefficients that allow the resummation of the large logarithmic contributions.
We find that the coefficient known in the literature as B^{(2)} is process
dependent, since it receives a hard contamination from the one loop correction
to the leading order subprocess. We present the general result of B^{(2)} for
both quark and gluon channels. In particular, in the case of Higgs production,
this result will be relevant to improve the matching between resummed
predictions and fixed order calculations.
| [
{
"created": "Tue, 15 Aug 2000 15:55:50 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Oct 2000 12:48:33 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"de Florian",
"D.",
"",
"ETH-Zurich"
],
[
"Grazzini",
"M.",
"",
"ETH-Zurich"
]
] | We study the region of small transverse momenta in qqbar- and gg-initiated processes with no colored particle detected in the final state. We present the universal expression of the O(alpha_s^2) logarithmically enhanced contributions up to next-to-next-to-leading logarithmic accuracy. From there we extract the coefficients that allow the resummation of the large logarithmic contributions. We find that the coefficient known in the literature as B^{(2)} is process dependent, since it receives a hard contamination from the one loop correction to the leading order subprocess. We present the general result of B^{(2)} for both quark and gluon channels. In particular, in the case of Higgs production, this result will be relevant to improve the matching between resummed predictions and fixed order calculations. |
hep-ph/0004087 | Yukinari Sumino | Y. Sumino | Renormalon Cancellation in Heavy Quarkonia and Determination of m_b, m_t | Based on the invited talk given at the Japan Physics Society Meeting,
Osaka, Japan, March 30 - April 2, 2000 | null | null | TU--588 | hep-ph | null | This is an elementary introduction to the recent significant theoretical
progress in the field of heavy quarkonium physics. We show how renormalon
cancellation takes place in the heavy quarkonium system, such as bottomonium
and (remnant of) toponium resonance, and how this notion is useful in
extracting the MSbar masses of the bottom and top quarks.
| [
{
"created": "Mon, 10 Apr 2000 03:24:54 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sumino",
"Y.",
""
]
] | This is an elementary introduction to the recent significant theoretical progress in the field of heavy quarkonium physics. We show how renormalon cancellation takes place in the heavy quarkonium system, such as bottomonium and (remnant of) toponium resonance, and how this notion is useful in extracting the MSbar masses of the bottom and top quarks. |
1607.00246 | Pavel Fileviez Perez | Pavel Fileviez Perez, Clara Murgui, Sebastian Ohmer | Simple Left-Right Theory: Lepton Number Violation at the LHC | to appear as a Rapid Communication in Physical Review D | Phys. Rev. D 94, 051701 (2016) | 10.1103/PhysRevD.94.051701 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a simple left-right symmetric theory where the neutrino masses are
generated at the quantum level. In this context the neutrinos are Majorana
fermions and the model has the minimal degrees of freedom in the scalar sector
needed for symmetry breaking and mass generation. We discuss the lepton number
violating signatures with two charged leptons of different flavor and missing
energy at the Large Hadron Collider in order to understand the testability of
the theory.
| [
{
"created": "Fri, 1 Jul 2016 13:50:23 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Sep 2016 19:32:02 GMT",
"version": "v2"
}
] | 2016-09-28 | [
[
"Perez",
"Pavel Fileviez",
""
],
[
"Murgui",
"Clara",
""
],
[
"Ohmer",
"Sebastian",
""
]
] | We propose a simple left-right symmetric theory where the neutrino masses are generated at the quantum level. In this context the neutrinos are Majorana fermions and the model has the minimal degrees of freedom in the scalar sector needed for symmetry breaking and mass generation. We discuss the lepton number violating signatures with two charged leptons of different flavor and missing energy at the Large Hadron Collider in order to understand the testability of the theory. |
1505.03418 | Wanwei Wu | Wanwei Wu | Semi-leptonic Decay of Lambda-b in the Standard Model and with New
Physics | 38 page, 7 figures. arXiv admin note: text overlap with
arXiv:1502.07230 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Heavy quark decays provide a very advantageous investigation to test the
Standard Model (SM). Recently, promising experiments with \textit{b} quark, as
well as the analysis of the huge data sets produced at the B factories, have
led to an increasing study and sensitive measurements of relative \textit{b}
quark decays. In this thesis, I calculate various observables in the
semi-leptonic decay process $\Lambda_{b}\to \Lambda_{c}\tau\bar{\nu}_{\tau}$
both in the SM and in the presence of New Physics (NP) operators with different
Lorentz structures. The results are relevant for the coming measurement of this
semi-leptonic decay at LHC \textit{b} experiment in CERN, and also provide
theoretical predictions to refine the physics beyond the SM.
| [
{
"created": "Wed, 13 May 2015 15:07:25 GMT",
"version": "v1"
}
] | 2015-05-14 | [
[
"Wu",
"Wanwei",
""
]
] | Heavy quark decays provide a very advantageous investigation to test the Standard Model (SM). Recently, promising experiments with \textit{b} quark, as well as the analysis of the huge data sets produced at the B factories, have led to an increasing study and sensitive measurements of relative \textit{b} quark decays. In this thesis, I calculate various observables in the semi-leptonic decay process $\Lambda_{b}\to \Lambda_{c}\tau\bar{\nu}_{\tau}$ both in the SM and in the presence of New Physics (NP) operators with different Lorentz structures. The results are relevant for the coming measurement of this semi-leptonic decay at LHC \textit{b} experiment in CERN, and also provide theoretical predictions to refine the physics beyond the SM. |
0911.2399 | Run-Hui Li | Cheng-Wei Chiang, Run-Hui Li, Cai-Dian L\"u | Study of $B\to K^{(*)} \ell^+\ell^-$ Decays in the Family Non-universal
$Z'$ Models | 19 pages, 4 figures, some errors corrected; Journal version | Chinese Physics C(HEP & NP)36, (2012), 14-24 | 10.1088/1674-1137/36/1/003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a combined investigation of the $B\to K^{(*)}\ell^+\ell^-$ decays,
constraints on the related couplings in family non-universal $Z^{\prime}$
models are derived. We find that within the allowed parameter space, the
recently observed forward-backward asymmetry in the $B\to K^*\ell^+\ell^-$
decay can be explained, by flipping the signs of the Wilson coefficients
$C_9^{\rm eff}$ and $C_{10}$. With the obtained constraints, we also calculate
the branching ratio of the $B_s\to\mu^+\mu^-$ decay. The upper bound of our
prediction is near the upper bound given by CDF Collaboration recently.
| [
{
"created": "Thu, 12 Nov 2009 14:20:48 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Aug 2011 11:41:44 GMT",
"version": "v2"
}
] | 2012-02-10 | [
[
"Chiang",
"Cheng-Wei",
""
],
[
"Li",
"Run-Hui",
""
],
[
"Lü",
"Cai-Dian",
""
]
] | In a combined investigation of the $B\to K^{(*)}\ell^+\ell^-$ decays, constraints on the related couplings in family non-universal $Z^{\prime}$ models are derived. We find that within the allowed parameter space, the recently observed forward-backward asymmetry in the $B\to K^*\ell^+\ell^-$ decay can be explained, by flipping the signs of the Wilson coefficients $C_9^{\rm eff}$ and $C_{10}$. With the obtained constraints, we also calculate the branching ratio of the $B_s\to\mu^+\mu^-$ decay. The upper bound of our prediction is near the upper bound given by CDF Collaboration recently. |
hep-ph/9412230 | null | E.L. Bratkovskaya, E.A. Kuraev, Z.K. Silagadze, O.V. Teryaev | Spin-Momentum Correlation (Handedness) in the Process of Four Pions
Production in the Electron-Positron Collisions | 9 pages, Latex, without figures. To appear in Phys. Lett. B | Phys.Lett. B338 (1994) 471 | 10.1016/0370-2693(94)90802-8 | E4-94-234 (Dubna) | hep-ph | null | We discuss special type of polarization asymmetry (``handedness") in the
process $e^+e^-\to 4\pi$, when one of initial particles is longitudinally
polarized. The asymmetry is proportional to the degree of polarization and to
the width to mass ratio of rho-meson. It can reach 4-5\% in some kinematical
region. Both channels $2 \pi^+ 2 \pi^-$ and $2 \pi^0 \pi^+ \pi^-$ are
considered in the framework of the effective chiral lagrangian with vector
mesons, in the energy range $\sim 1$ GeV. The corresponding total cross
sections are also calculated.
| [
{
"created": "Mon, 5 Dec 1994 14:19:42 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Bratkovskaya",
"E. L.",
""
],
[
"Kuraev",
"E. A.",
""
],
[
"Silagadze",
"Z. K.",
""
],
[
"Teryaev",
"O. V.",
""
]
] | We discuss special type of polarization asymmetry (``handedness") in the process $e^+e^-\to 4\pi$, when one of initial particles is longitudinally polarized. The asymmetry is proportional to the degree of polarization and to the width to mass ratio of rho-meson. It can reach 4-5\% in some kinematical region. Both channels $2 \pi^+ 2 \pi^-$ and $2 \pi^0 \pi^+ \pi^-$ are considered in the framework of the effective chiral lagrangian with vector mesons, in the energy range $\sim 1$ GeV. The corresponding total cross sections are also calculated. |
1404.5726 | Gulsheen Ahuja | Samandeep Sharma, Priyanka Fakay, Gulsheen Ahuja and Manmohan Gupta | Clues towards unified textures | 14 pages, 2 figures | Int.J.Mod.Phys. A29 (2014) 1444005 | 10.1142/S0217751X14440059 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The issue of texture specific mass matrices has been discussed by
incorporating Weak Basis transformations and the concept of `naturalness'.
Interestingly, we find that starting from the most general mass matrices, one
can arrive at texture four zero mass matrices which can fit both quark as well
as lepton mixing data and are similar to the original Fritzsch ansatze.
| [
{
"created": "Wed, 23 Apr 2014 07:33:49 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Sharma",
"Samandeep",
""
],
[
"Fakay",
"Priyanka",
""
],
[
"Ahuja",
"Gulsheen",
""
],
[
"Gupta",
"Manmohan",
""
]
] | The issue of texture specific mass matrices has been discussed by incorporating Weak Basis transformations and the concept of `naturalness'. Interestingly, we find that starting from the most general mass matrices, one can arrive at texture four zero mass matrices which can fit both quark as well as lepton mixing data and are similar to the original Fritzsch ansatze. |
0904.4533 | Angel Sanchez Dr | Alejandro Ayala, Adnan Bashir, Alfredo Raya and Angel S\'anchez | Chiral phase transition in relativistic heavy-ion collisions with weak
magnetic fields: ring diagrams in the linear sigma model | 8 pages, 6 figures, To be published in Phys. Rev. D | Phys.Rev.D80:036005,2009 | 10.1103/PhysRevD.80.036005 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Working in the linear sigma model with quarks, we compute the
finite-temperature effective potential in the presence of a weak magnetic
field, including the contribution of the pion ring diagrams and considering the
sigma as a classical field. In the approximation where the pion self-energy is
computed perturbatively, we show that there is a region of the parameter space
where the effect of the ring diagrams is to preclude the phase transition from
happening. Inclusion of the magnetic field has small effects that however
become more important as the system evolves to the lowest temperatures allowed
in the analysis.
| [
{
"created": "Wed, 29 Apr 2009 04:58:42 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jul 2009 21:02:59 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Ayala",
"Alejandro",
""
],
[
"Bashir",
"Adnan",
""
],
[
"Raya",
"Alfredo",
""
],
[
"Sánchez",
"Angel",
""
]
] | Working in the linear sigma model with quarks, we compute the finite-temperature effective potential in the presence of a weak magnetic field, including the contribution of the pion ring diagrams and considering the sigma as a classical field. In the approximation where the pion self-energy is computed perturbatively, we show that there is a region of the parameter space where the effect of the ring diagrams is to preclude the phase transition from happening. Inclusion of the magnetic field has small effects that however become more important as the system evolves to the lowest temperatures allowed in the analysis. |
hep-ph/0112039 | Dilip Ghosh | Abdesselam Arhrib, Dilip Kumar Ghosh, Otto C. W. Kong | Observing CP Violating MSSM Higgs Bosons at Hadron Colliders ? | 16 pages, LaTeX, 4 postscript figures, some clarification, and
misprints are corrected. To appear in Phys. Lett. B | Phys.Lett. B537 (2002) 217-226 | 10.1016/S0370-2693(02)01912-3 | null | hep-ph | null | We report on the possibility of observing Higgs sector CP violation of the
minimal supersymmetric standard model at a hadron machine. The CP phase
dependent cross-sections for the $VH_i$ associated production processes are
given for the Fermilab Tevatron and CERN LHC. Substantial production
cross-sections for channels of all three Higgs bosons simultaneously are shown
to be possible, giving a drect indication of the CP violation. The
observability of the Higgs signals are discussed.
| [
{
"created": "Tue, 4 Dec 2001 18:48:42 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jun 2002 07:43:43 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Arhrib",
"Abdesselam",
""
],
[
"Ghosh",
"Dilip Kumar",
""
],
[
"Kong",
"Otto C. W.",
""
]
] | We report on the possibility of observing Higgs sector CP violation of the minimal supersymmetric standard model at a hadron machine. The CP phase dependent cross-sections for the $VH_i$ associated production processes are given for the Fermilab Tevatron and CERN LHC. Substantial production cross-sections for channels of all three Higgs bosons simultaneously are shown to be possible, giving a drect indication of the CP violation. The observability of the Higgs signals are discussed. |
2211.13299 | Ben King | S. Tang and B. King | Locally monochromatic two-step nonlinear trident process in a plane wave | 14 pages, 9 figures | Phys. Rev. D 107, 096004 (2023) | 10.1103/PhysRevD.107.096004 | null | hep-ph physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In many-cycle plane waves at intermediate intensities, the nonlinear trident
process can be well-approximated by the two sequential steps of nonlinear
Compton scattering of a polarised real photon followed by its transformation
into an electron-positron pair via nonlinear Breit-Wheeler pair creation. We
investigate this two-step process in the intermediate intensity regime by
employing the locally monochromatic approximation for each step and numerically
evaluating resulting expressions. When photon polarisation is included, it is
found to produce an order 10% decrease in the trident rate: the importance of
polarisation increases at lower intensities, and decreases at higher
intensities. Its importance persists at higher intensities in a
linearly-polarised background, but disappears at high intensities in a
circularly-polarised background. If the two steps are made to take place in two
linearly-polarised plane wave pulses with perpendicular polarisations, the pair
yield can be increased by approximately 30% compared to two plane waves with
the same polarisation. It is also shown that harmonic structures in the Compton
step can be passed to the pair step if the Compton edge is at an energy of the
order of the threshold for linear Breit-Wheeler.
| [
{
"created": "Wed, 23 Nov 2022 20:59:29 GMT",
"version": "v1"
}
] | 2023-05-11 | [
[
"Tang",
"S.",
""
],
[
"King",
"B.",
""
]
] | In many-cycle plane waves at intermediate intensities, the nonlinear trident process can be well-approximated by the two sequential steps of nonlinear Compton scattering of a polarised real photon followed by its transformation into an electron-positron pair via nonlinear Breit-Wheeler pair creation. We investigate this two-step process in the intermediate intensity regime by employing the locally monochromatic approximation for each step and numerically evaluating resulting expressions. When photon polarisation is included, it is found to produce an order 10% decrease in the trident rate: the importance of polarisation increases at lower intensities, and decreases at higher intensities. Its importance persists at higher intensities in a linearly-polarised background, but disappears at high intensities in a circularly-polarised background. If the two steps are made to take place in two linearly-polarised plane wave pulses with perpendicular polarisations, the pair yield can be increased by approximately 30% compared to two plane waves with the same polarisation. It is also shown that harmonic structures in the Compton step can be passed to the pair step if the Compton edge is at an energy of the order of the threshold for linear Breit-Wheeler. |
hep-ph/0102331 | Jonathan R. Ellis | J. Ellis (CERN), D.V. Nanopoulos (Texas A&M, HARC, Academy of Athens)
and K.A. Olive (CERN, U. Minnesota) | Combining the Muon Anomalous Magnetic Moment with other Constraints on
the CMSSM | 14 pages, 3 eps figures, for a version with high-resolution figures,
go to http://www.hep.umn.edu/~olive/ENO4.ps | Phys.Lett.B508:65-73,2001 | 10.1016/S0370-2693(01)00480-4 | CERN-TH/2001-054, ACT-02/01, CTP-TAMU-06/01, UMN-TH-1938/01,
TPI-MINN-01/07 | hep-ph astro-ph hep-ex | null | We combine the constraint suggested by the recent BNL E821 measurement of the
anomalous magnetic moment of the muon on the parameter space of the constrained
MSSM (CMSSM) with those provided previously by LEP, the measured rate of b to s
gamma decay and the cosmological relic density Omega-hsquared. Our treatment of
Omega-hsquared includes carefully the direct-channel Higgs poles in
annihilation of pairs of neutralinos chi and a complete analysis of chi -
slepton coannihilation. We find excellent consistency between all the
constraints for tan beta > 10 and mu > 0, for restricted ranges of the CMSSM
parameters m_0 and m_1/2. All the preferred CMSSM parameter space is within
reach of the LHC, but may not be accessible to the Tevatron collider, or to a
first-generation e^+ e^- linear collider with centre-of-mass energy below 1.2
TeV.
| [
{
"created": "Tue, 27 Feb 2001 21:37:30 GMT",
"version": "v1"
}
] | 2009-09-11 | [
[
"Ellis",
"J.",
"",
"CERN"
],
[
"Nanopoulos",
"D. V.",
"",
"Texas A&M, HARC, Academy of Athens"
],
[
"Olive",
"K. A.",
"",
"CERN, U. Minnesota"
]
] | We combine the constraint suggested by the recent BNL E821 measurement of the anomalous magnetic moment of the muon on the parameter space of the constrained MSSM (CMSSM) with those provided previously by LEP, the measured rate of b to s gamma decay and the cosmological relic density Omega-hsquared. Our treatment of Omega-hsquared includes carefully the direct-channel Higgs poles in annihilation of pairs of neutralinos chi and a complete analysis of chi - slepton coannihilation. We find excellent consistency between all the constraints for tan beta > 10 and mu > 0, for restricted ranges of the CMSSM parameters m_0 and m_1/2. All the preferred CMSSM parameter space is within reach of the LHC, but may not be accessible to the Tevatron collider, or to a first-generation e^+ e^- linear collider with centre-of-mass energy below 1.2 TeV. |
hep-ph/0703270 | Xiao-Gang He | Xiao-Gang He, German Valencia | $D-\bar{D}$ mixing constraints on FCNC with a non-universal $Z^\prime$ | RevTex, 10 pages, 1 figure. Several typoes corrected | Phys.Lett.B651:135-138,2007 | 10.1016/j.physletb.2007.06.007 | null | hep-ph hep-ex | null | The BaBar and Belle collaborations have recently reported evidence for
$D^0-\bar D^0$ mixing. This measurement provides the first significant
constraint on FCNC in the up-quark sector for non-universal $Z^\prime$ models.
Attributing the observed $D-\bar D$ mixing to new physics, we comment on the
resulting rare $D$ and $t$ decays. We also show that a CP violating
semileptonic asymmetry as large as $\sim 30%$ is allowed by the experimental
results.
| [
{
"created": "Mon, 26 Mar 2007 02:12:34 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Apr 2007 04:45:38 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Jun 2007 00:02:50 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"He",
"Xiao-Gang",
""
],
[
"Valencia",
"German",
""
]
] | The BaBar and Belle collaborations have recently reported evidence for $D^0-\bar D^0$ mixing. This measurement provides the first significant constraint on FCNC in the up-quark sector for non-universal $Z^\prime$ models. Attributing the observed $D-\bar D$ mixing to new physics, we comment on the resulting rare $D$ and $t$ decays. We also show that a CP violating semileptonic asymmetry as large as $\sim 30%$ is allowed by the experimental results. |
hep-ph/9606385 | null | Chong Sheng Li, Robert J. Oakes and Jin Min Yang | One-loop QCD Corrections to Top Quark Decay into a Neutralino and Light
Stop | 13 pages, 5 figures, revised version(using dimensional reduction
technique, the corrections have been recalculated) | Phys.Rev. D54 (1996) 6883-6889 | 10.1103/PhysRevD.54.6883 | NUHEP-TH-96-3 | hep-ph | null | We calculate the one-loop QCD corrections to $t\rightarrow \tilde t_1 \tilde
\chi^0_j$ using dimensional reduction scheme, including QCD and supersymmetric
QCD corrections. The analytic expressions for the corrections to the decay
width are given, which can easily be extended to $t\rightarrow \tilde \chi^+_j
\tilde b_i $. The numerical results show that the correction amounts to more
than a 10\% reduction in the partial width relative to the tree level result.
We also compare the corrections in the no-mixing stop case with those in the
mixing stop case.
| [
{
"created": "Wed, 19 Jun 1996 22:58:56 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jun 1996 22:49:15 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Jul 1996 19:16:00 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Li",
"Chong Sheng",
""
],
[
"Oakes",
"Robert J.",
""
],
[
"Yang",
"Jin Min",
""
]
] | We calculate the one-loop QCD corrections to $t\rightarrow \tilde t_1 \tilde \chi^0_j$ using dimensional reduction scheme, including QCD and supersymmetric QCD corrections. The analytic expressions for the corrections to the decay width are given, which can easily be extended to $t\rightarrow \tilde \chi^+_j \tilde b_i $. The numerical results show that the correction amounts to more than a 10\% reduction in the partial width relative to the tree level result. We also compare the corrections in the no-mixing stop case with those in the mixing stop case. |
1606.06091 | Sergey Afonin | S. S. Afonin and I. V. Pusenkov | The no-wall holographic model for vector quarkonia | A talk presented at QUARKS-2016 | null | 10.1051/epjconf/201612504004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the no-wall holographic approach (a relative of the soft-wall one) to
construct a universal description of vector mesons with arbitrary quark masses.
The proposed model predicts a specific dependence of the parameters of radial
Regge trajectories on the quark masses in a reasonable agreement with the meson
phenomenology and some theoretical expectations.
| [
{
"created": "Mon, 20 Jun 2016 12:40:07 GMT",
"version": "v1"
}
] | 2016-11-23 | [
[
"Afonin",
"S. S.",
""
],
[
"Pusenkov",
"I. V.",
""
]
] | We use the no-wall holographic approach (a relative of the soft-wall one) to construct a universal description of vector mesons with arbitrary quark masses. The proposed model predicts a specific dependence of the parameters of radial Regge trajectories on the quark masses in a reasonable agreement with the meson phenomenology and some theoretical expectations. |
1506.05881 | \c{C}a\u{g}lar Do\u{g}an | \c{C}a\u{g}lar Do\u{g}an | Shear Viscosity of a Quark Plasma Near the Chiral Phase Transition | 12 pages, 5 figures, 1 appendix | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the shear viscosity $\eta$ of a quark plasma through the
two-flavor Nambu-Jona-Lasinio (NJL) model in the chiral limit, at finite
temperature $T$, and baryon number chemical potential $\mu_B$. We solve the
Boltzmann equation by using in the collision term cross sections that are
correct to leading order in the coupling constant. We find the ratio of shear
viscosity to entropy density above and slightly below the chiral transition
temperature to vary from 1.5 to 13 times the conjectured lower bound of
$(4\pi)^{-1}$ depending on the chemical potential to temperature ratio. Ratio
of shear viscosity to entropy density is found to be a monotonically increasing
function of the ratio of chemical potential to temperature for temperatures
between 185 and 300 MeV.
| [
{
"created": "Fri, 19 Jun 2015 06:00:00 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Doğan",
"Çağlar",
""
]
] | We calculate the shear viscosity $\eta$ of a quark plasma through the two-flavor Nambu-Jona-Lasinio (NJL) model in the chiral limit, at finite temperature $T$, and baryon number chemical potential $\mu_B$. We solve the Boltzmann equation by using in the collision term cross sections that are correct to leading order in the coupling constant. We find the ratio of shear viscosity to entropy density above and slightly below the chiral transition temperature to vary from 1.5 to 13 times the conjectured lower bound of $(4\pi)^{-1}$ depending on the chemical potential to temperature ratio. Ratio of shear viscosity to entropy density is found to be a monotonically increasing function of the ratio of chemical potential to temperature for temperatures between 185 and 300 MeV. |
1002.4990 | Marina Nielsen | M.E. Bracco, M. Nielsen | The B_{s0} meson and the B_{s0}B K coupling from QCD sum rules | revised version to appear in Phys. Rev. D | Phys.Rev.D82:034012,2010 | 10.1103/PhysRevD.82.034012 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We evaluate the mass of the $B_{s0}$ scalar meson and the coupling constant
in the $B_{s0} B K$ vertex in the framework of QCD sum rules. We consider the
$B_{s0}$ as a tetraquark state to evaluate its mass. We get $m_{B_s0}=(6.04\pm
0.08) \GeV$, which is bigger than predictions supposing it as a $b\bar{s}$
state or a $B\bar{K}$ bound state with $J^{P}=0^+$. To evaluate the $g_{B_{s0}B
K}$ coupling we use the three point correlation functions of the vertex,
considering $ B_{s0} $ as a normal $b\bar{s}$ state. The obtained coupling
constant is: $g_{B_{s0} B K} =(16.3 \pm 3.2) \GeV$. This number is in agreement
with light-cone QCD sum rules calculation. We have also compared the decay
width of the $\BS\to BK$ process considering the $\BS$ to be a $b\bar{s}$ state
and a $BK$ molecular state. The width obtained for the $BK$ molecular state is
twice as big as the width obtained for the $b\bar{s}$ state. Therefore, we
conclude that with the knowledge of the mass and the decay width of the $\BS$
meson, one can discriminate between the different theoretical proposals for its
structure.
| [
{
"created": "Fri, 26 Feb 2010 13:51:44 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Jul 2010 13:05:20 GMT",
"version": "v2"
}
] | 2015-03-13 | [
[
"Bracco",
"M. E.",
""
],
[
"Nielsen",
"M.",
""
]
] | We evaluate the mass of the $B_{s0}$ scalar meson and the coupling constant in the $B_{s0} B K$ vertex in the framework of QCD sum rules. We consider the $B_{s0}$ as a tetraquark state to evaluate its mass. We get $m_{B_s0}=(6.04\pm 0.08) \GeV$, which is bigger than predictions supposing it as a $b\bar{s}$ state or a $B\bar{K}$ bound state with $J^{P}=0^+$. To evaluate the $g_{B_{s0}B K}$ coupling we use the three point correlation functions of the vertex, considering $ B_{s0} $ as a normal $b\bar{s}$ state. The obtained coupling constant is: $g_{B_{s0} B K} =(16.3 \pm 3.2) \GeV$. This number is in agreement with light-cone QCD sum rules calculation. We have also compared the decay width of the $\BS\to BK$ process considering the $\BS$ to be a $b\bar{s}$ state and a $BK$ molecular state. The width obtained for the $BK$ molecular state is twice as big as the width obtained for the $b\bar{s}$ state. Therefore, we conclude that with the knowledge of the mass and the decay width of the $\BS$ meson, one can discriminate between the different theoretical proposals for its structure. |
1811.12336 | Fei Wang | Fei Wang | ExtraOrdinary Gauge Mediation Extension of deflected AMSB | Major changes, discussions added. 23 pages, 1 table | Universe 2022, 8, 251 | 10.3390/universe8050251 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Extraordinary gauge mediation extension of deflected AMSB scenarios can be
interesting because it can accommodate together the deflection in the Kahler
potential and the superpotential. We revisit the EGM scenario and derive the
analytical expressions for soft SUSY breaking parameters in EGM and EGM
extension of deflected AMSB scenarios with wavefunction renormalization
approach, especially the case with vanishing gauge beta-function at an
intermediate energy scale. The Landau pole and proton decay constraints are
also discussed.
| [
{
"created": "Thu, 29 Nov 2018 17:37:59 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Oct 2019 12:16:23 GMT",
"version": "v2"
}
] | 2022-04-26 | [
[
"Wang",
"Fei",
""
]
] | Extraordinary gauge mediation extension of deflected AMSB scenarios can be interesting because it can accommodate together the deflection in the Kahler potential and the superpotential. We revisit the EGM scenario and derive the analytical expressions for soft SUSY breaking parameters in EGM and EGM extension of deflected AMSB scenarios with wavefunction renormalization approach, especially the case with vanishing gauge beta-function at an intermediate energy scale. The Landau pole and proton decay constraints are also discussed. |
1404.4517 | Philipp Bijan Bahavar | Philipp B. Bahavar, Jan Uphoff, Carsten Greiner | Hadronic vs. partonic J/psi production in the Statistical Hadronization
Model | 5 pages, 4 figures | Phys. Rev. C 90, 061901 (2014) | 10.1103/PhysRevC.90.061901 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Assuming the Statistical Hadronization Model and charm flavour conservation,
one can quantify the deviation of charm and anti-charm quarks from chemical
equilibrium both in the hadronic phase and in the quark-gluon plasma. By
linking the hadronic fireball volume and the corresponding plasma source volume
via entropy conservation as proposed by Grandchamp et al., a direct comparison
between the $J/\psi$ yields in both pictures can be used to obtain limits for
the charm quark mass in the medium.
| [
{
"created": "Thu, 17 Apr 2014 13:04:12 GMT",
"version": "v1"
},
{
"created": "Wed, 7 May 2014 13:03:48 GMT",
"version": "v2"
}
] | 2014-12-24 | [
[
"Bahavar",
"Philipp B.",
""
],
[
"Uphoff",
"Jan",
""
],
[
"Greiner",
"Carsten",
""
]
] | Assuming the Statistical Hadronization Model and charm flavour conservation, one can quantify the deviation of charm and anti-charm quarks from chemical equilibrium both in the hadronic phase and in the quark-gluon plasma. By linking the hadronic fireball volume and the corresponding plasma source volume via entropy conservation as proposed by Grandchamp et al., a direct comparison between the $J/\psi$ yields in both pictures can be used to obtain limits for the charm quark mass in the medium. |
hep-ph/0611153 | George W. S. Hou | George W.S. Hou | Search for Bottom Counterparts of X(3872) and Y(4260) via
$\pi^+\pi^-\Upsilon$ | 4 pages, no figures, presented at ICHEP 2006 | null | null | null | hep-ph | null | The X(3872) and Y(4260), both discovered in $\pi^+\pi^- J/\psi$ mode, are
rather unusual: $X_c\equiv X(3872)$ is very narrow, while $Y_c \equiv Y(4260)$
has large $Y_c\to \pi^+\pi^-J/\psi$ width. Many models for their composition
have been suggested, but perhaps discovering their bottom counterparts could
shed much light on the issue. The narrow state, $X_b$ may be searched for at
the Tevatron via $p\bar p \to \pi^+\pi^-\Upsilon + X$, with the LHC much more
promising. The state $Y_b$ can be searched for at B factories via radiative
return $e^+e^- \to \gamma_{\rm ISR} + \pi^+\pi^-\Upsilon$ on $\Upsilon(5S)$, or
by $e^+e^- \to \pi^+\pi^-\Upsilon$ direct scan.
| [
{
"created": "Sat, 11 Nov 2006 08:03:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hou",
"George W. S.",
""
]
] | The X(3872) and Y(4260), both discovered in $\pi^+\pi^- J/\psi$ mode, are rather unusual: $X_c\equiv X(3872)$ is very narrow, while $Y_c \equiv Y(4260)$ has large $Y_c\to \pi^+\pi^-J/\psi$ width. Many models for their composition have been suggested, but perhaps discovering their bottom counterparts could shed much light on the issue. The narrow state, $X_b$ may be searched for at the Tevatron via $p\bar p \to \pi^+\pi^-\Upsilon + X$, with the LHC much more promising. The state $Y_b$ can be searched for at B factories via radiative return $e^+e^- \to \gamma_{\rm ISR} + \pi^+\pi^-\Upsilon$ on $\Upsilon(5S)$, or by $e^+e^- \to \pi^+\pi^-\Upsilon$ direct scan. |
1509.03583 | Oleksii Matsedonskyi | Oleksii Matsedonskyi | Mirror Cosmological Relaxation of the Electroweak Scale | 9 pages, 2 figures; version published in JHEP | null | 10.1007/JHEP01(2016)063 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The cosmological relaxation mechanism proposed in [1] allows for a
dynamically generated large separation between the weak scale and a theory
cutoff, using a sharp change of theory behaviour upon crossing the limit
between unbroken and broken symmetry phases. In this note we present a
variation of this scenario, in which stabilization of the electroweak scale in
the right place is ensured by the $Z_2$ symmetry exchanging the Standard Model
(SM) with its mirror copy. We sketch the possible ways to produce viable
thermal evolution of the Universe and discuss experimental accessibility of the
new physics effects. We show that in this scenario the mirror SM can either
have sizeable couplings with the ordinary one, or, conversely, can interact
with it with a negligible strength. The overall cutoff allowed by such a
construction can reach $10^9$ GeV.
| [
{
"created": "Fri, 11 Sep 2015 17:15:17 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Jan 2016 11:20:59 GMT",
"version": "v2"
}
] | 2016-02-17 | [
[
"Matsedonskyi",
"Oleksii",
""
]
] | The cosmological relaxation mechanism proposed in [1] allows for a dynamically generated large separation between the weak scale and a theory cutoff, using a sharp change of theory behaviour upon crossing the limit between unbroken and broken symmetry phases. In this note we present a variation of this scenario, in which stabilization of the electroweak scale in the right place is ensured by the $Z_2$ symmetry exchanging the Standard Model (SM) with its mirror copy. We sketch the possible ways to produce viable thermal evolution of the Universe and discuss experimental accessibility of the new physics effects. We show that in this scenario the mirror SM can either have sizeable couplings with the ordinary one, or, conversely, can interact with it with a negligible strength. The overall cutoff allowed by such a construction can reach $10^9$ GeV. |
1705.06053 | Jean-Nicolas Lang | Ansgar Denner, Jean-Nicolas Lang and Sandro Uccirati | NLO electroweak corrections in extended Higgs Sectors with RECOLA2 | 47 pages, 29 figures, pdflatex, version to appear in JHEP | null | 10.1007/JHEP07(2017)087 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the computer code RECOLA2 along with the first NLO electroweak
corrections to Higgs production in vector-boson fusion and updated results for
Higgs strahlung in the Two-Higgs-Doublet Model and Higgs-Singlet extension of
the Standard Model. A fully automated procedure for the generation of
tree-level and one-loop matrix elements in general models, including
renormalization, is presented. We discuss the application of the
Background-Field Method to the extended models. Numerical results for NLO
electroweak cross sections are presented for different renormalization schemes
in the Two-Higgs-Doublet Model and the Higgs-Singlet extension of the Standard
Model. Finally, we present distributions for the production of a heavy Higgs
boson.
| [
{
"created": "Wed, 17 May 2017 08:55:14 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jul 2017 08:00:19 GMT",
"version": "v2"
}
] | 2017-08-02 | [
[
"Denner",
"Ansgar",
""
],
[
"Lang",
"Jean-Nicolas",
""
],
[
"Uccirati",
"Sandro",
""
]
] | We present the computer code RECOLA2 along with the first NLO electroweak corrections to Higgs production in vector-boson fusion and updated results for Higgs strahlung in the Two-Higgs-Doublet Model and Higgs-Singlet extension of the Standard Model. A fully automated procedure for the generation of tree-level and one-loop matrix elements in general models, including renormalization, is presented. We discuss the application of the Background-Field Method to the extended models. Numerical results for NLO electroweak cross sections are presented for different renormalization schemes in the Two-Higgs-Doublet Model and the Higgs-Singlet extension of the Standard Model. Finally, we present distributions for the production of a heavy Higgs boson. |
hep-ph/0010177 | Guy Moore | Peter Arnold, Guy D. Moore, Laurence G. Yaffe | Transport coefficients in high temperature gauge theories: (I)
Leading-log results | 41 pages, including 4 figures | JHEP 0011:001,2000 | 10.1088/1126-6708/2000/11/001 | UW/PT 00-15 | hep-ph astro-ph hep-th | null | Leading-log results are derived for the shear viscosity, electrical
conductivity, and flavor diffusion constants in both Abelian and non-Abelian
high temperature gauge theories with various matter field content.
| [
{
"created": "Mon, 16 Oct 2000 21:46:56 GMT",
"version": "v1"
}
] | 2010-02-16 | [
[
"Arnold",
"Peter",
""
],
[
"Moore",
"Guy D.",
""
],
[
"Yaffe",
"Laurence G.",
""
]
] | Leading-log results are derived for the shear viscosity, electrical conductivity, and flavor diffusion constants in both Abelian and non-Abelian high temperature gauge theories with various matter field content. |
hep-ph/0411209 | Hiroaki Sugiyama | Hiroaki Sugiyama (KEK, Tsukuba) | Exploring Leptonic CP Violation with Combined Analysis of Reactor and
Neutrino Superbeam Experiments | 4 pages, 5 eps-files, ws-procs10x7.cls, talk at the 32nd
International Conference on High Energy Physics (ICHEP04), Aug. 16-22, 2004,
Beijing, China | null | 10.1016/j.nuclphysbps.2005.01.210 | KEK-TH-996 | hep-ph | null | We investigate the possibility to find the leptonic CP-violation by combining
the reactor experiment with the superbeam experiment without antineutrino
superbeam. We show also how much the sensitivity on CP-violating phase delta is
affected by the fact that we have not known the sign of Delta m^2_31.
| [
{
"created": "Tue, 16 Nov 2004 15:00:26 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Sugiyama",
"Hiroaki",
"",
"KEK, Tsukuba"
]
] | We investigate the possibility to find the leptonic CP-violation by combining the reactor experiment with the superbeam experiment without antineutrino superbeam. We show also how much the sensitivity on CP-violating phase delta is affected by the fact that we have not known the sign of Delta m^2_31. |
1209.5913 | Roshan Foadi | Diogo Buarque Franzosi and Roshan Foadi | Probing Near-Conformal Technicolor through Weak Boson Scattering | 19 pages, 4 figures | null | 10.1103/PhysRevD.88.015013 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recently observed boson at 125 GeV could be a light composite scalar from
near-conformal technicolor dynamics: a technicolor Higgs. If this is the case,
unitarization of longitudinal weak boson scattering amplitudes, which is due to
exchanges of the Higgs and spin-one vector technimesons, is expected to occur
in a strong regime, with saturation of the unitarity bounds. This implies that
$pp \to V V jj$ processes, where $V$ is either a $W$ or a $Z$ boson, are
enhanced, relative to the standard model. We show that this allows probing
near-conformal technicolor for couplings and masses of the spin-one resonances
which are not directly accessible for direct Drell-Yan production.
| [
{
"created": "Wed, 26 Sep 2012 12:27:39 GMT",
"version": "v1"
}
] | 2013-08-09 | [
[
"Franzosi",
"Diogo Buarque",
""
],
[
"Foadi",
"Roshan",
""
]
] | The recently observed boson at 125 GeV could be a light composite scalar from near-conformal technicolor dynamics: a technicolor Higgs. If this is the case, unitarization of longitudinal weak boson scattering amplitudes, which is due to exchanges of the Higgs and spin-one vector technimesons, is expected to occur in a strong regime, with saturation of the unitarity bounds. This implies that $pp \to V V jj$ processes, where $V$ is either a $W$ or a $Z$ boson, are enhanced, relative to the standard model. We show that this allows probing near-conformal technicolor for couplings and masses of the spin-one resonances which are not directly accessible for direct Drell-Yan production. |
1012.2647 | Chia-Min Lin | Chia-Min Lin | Hilltop Supernatural Inflation | 5 pages, 4 figures, talk given at YKIS2010 symposium in Kyoto
University, to be published as a volume of Progress of Theoretical Physics,
Supplement | null | 10.1142/S0218271811019669 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk, I will explain how to reduce the spectral index to be n_s=0.96
for supernatural inflation. I will also show the constraint to the reheating
temperature from Big Bang Nucleosynthesis of both thermal and non-thermal
gravitino production.
| [
{
"created": "Mon, 13 Dec 2010 07:29:56 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Lin",
"Chia-Min",
""
]
] | In this talk, I will explain how to reduce the spectral index to be n_s=0.96 for supernatural inflation. I will also show the constraint to the reheating temperature from Big Bang Nucleosynthesis of both thermal and non-thermal gravitino production. |
hep-ph/0001144 | Luis Anchordoqui | Gene Cooperman, Luis Anchordoqui, Victor Grinberg, Thomas McCauley,
Stephen Reucroft, and John Swain | Scalable Parallel Implementation of Geant4 Using Commodity Hardware and
Task Oriented Parallel C | To appear in the Proceedings of the International Conference on
Computing in High Energy and Nuclear Physics, CHEP2000, Padova, Italy,
February 7-11, 2000 | null | null | null | hep-ph astro-ph | null | We describe a scalable parallelization of Geant4 using commodity hardware in
a collaborative effort between the College of Computer Science and the
Department of Physics at Northeastern University. The system consists of a
Beowulf cluster of 32 Pentium II processors with 128 MBytes of memory each,
connected via ATM and fast Ethernet. The bulk of the parallelization is done
using TOP-C (Task Oriented Parallel C), software widely used in the
computational algebra community. TOP-C provides a flexible and powerful
framework for parallel algorithm development, is easy to learn, and is
available at no cost. Its task oriented nature allows one to parallelize legacy
code while hiding the details of interprocess communications. Applications
include fast interactive simulation of computationally intensive processes such
as electromagnetic showers. General results motivate wider applications of
TOP-C to other simulation problems as well as to pattern recognition in high
energy physics.
| [
{
"created": "Sat, 15 Jan 2000 22:02:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cooperman",
"Gene",
""
],
[
"Anchordoqui",
"Luis",
""
],
[
"Grinberg",
"Victor",
""
],
[
"McCauley",
"Thomas",
""
],
[
"Reucroft",
"Stephen",
""
],
[
"Swain",
"John",
""
]
] | We describe a scalable parallelization of Geant4 using commodity hardware in a collaborative effort between the College of Computer Science and the Department of Physics at Northeastern University. The system consists of a Beowulf cluster of 32 Pentium II processors with 128 MBytes of memory each, connected via ATM and fast Ethernet. The bulk of the parallelization is done using TOP-C (Task Oriented Parallel C), software widely used in the computational algebra community. TOP-C provides a flexible and powerful framework for parallel algorithm development, is easy to learn, and is available at no cost. Its task oriented nature allows one to parallelize legacy code while hiding the details of interprocess communications. Applications include fast interactive simulation of computationally intensive processes such as electromagnetic showers. General results motivate wider applications of TOP-C to other simulation problems as well as to pattern recognition in high energy physics. |
1605.00771 | Ralf-Arno Tripolt | Ralf-Arno Tripolt, Lorenz von Smekal, Jochen Wambach | Spectral functions and in-medium properties of hadrons | Contribution to the Gerry Brown memorial book published by World
Scientific | null | 10.1142/S0218301317400286 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The in-medium modifications of hadron properties such as masses and decay
widths have been a major focus of the scientific work of Gerry Brown and the
insights gained by him and his collaborators made them major drivers of this
field for several decades. Their prediction of experimental signals in
di-lepton pair production in relativistic heavy-ion collisions were
instrumental in initiating large experimental campaigns which continue until
today. In this chapter we review recent results which elucidate the relation of
hadronic spectral properties at finite temperature and density to the
restoration of spontaneously broken chiral symmetry.
| [
{
"created": "Tue, 3 May 2016 07:48:57 GMT",
"version": "v1"
}
] | 2017-03-08 | [
[
"Tripolt",
"Ralf-Arno",
""
],
[
"von Smekal",
"Lorenz",
""
],
[
"Wambach",
"Jochen",
""
]
] | The in-medium modifications of hadron properties such as masses and decay widths have been a major focus of the scientific work of Gerry Brown and the insights gained by him and his collaborators made them major drivers of this field for several decades. Their prediction of experimental signals in di-lepton pair production in relativistic heavy-ion collisions were instrumental in initiating large experimental campaigns which continue until today. In this chapter we review recent results which elucidate the relation of hadronic spectral properties at finite temperature and density to the restoration of spontaneously broken chiral symmetry. |
0802.2241 | Miriam Giorgini | G. Giacomelli (University of Bologna and INFN Sezione di Bologna) | Hadron-nuclei collisions at high energies | In honour of Dumitru B. Ion | Rom.Rep.Phys.60:193-204,2008 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A brief historical review is made of the hadron-hadron (hh) total cross
section and hadron-nucleus absorption cross section measurements, made mainly
at high energy proton synchrotrons. Then I shall discuss low p_tprocesses,
including diffraction processes and fragmentation of nuclei in nucleus-nucleus
collisions. Nucleus-nucleus collisions at higher energy colliders are then
considered, mainly in the context of the search for the gluon quark plasma.
Conclusions and a short discussion on perspectives follow.
| [
{
"created": "Fri, 15 Feb 2008 17:05:38 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Giacomelli",
"G.",
"",
"University of Bologna and INFN Sezione di Bologna"
]
] | A brief historical review is made of the hadron-hadron (hh) total cross section and hadron-nucleus absorption cross section measurements, made mainly at high energy proton synchrotrons. Then I shall discuss low p_tprocesses, including diffraction processes and fragmentation of nuclei in nucleus-nucleus collisions. Nucleus-nucleus collisions at higher energy colliders are then considered, mainly in the context of the search for the gluon quark plasma. Conclusions and a short discussion on perspectives follow. |
hep-ph/0701124 | Alexandra Gurinovich | V.G. Baryshevsky | Search for the neutron EDM and time reversal symmetry violation in
noncentrosymmetric crystals | 9 pages, this work is carried out within the joint grant of
Belarusian Republican Fund for Fundamental Research and Russian Fundamental
Research Fund $#\Phi06$P-074 | null | null | null | hep-ph | null | CP-violating spin rotation and spin dichroism in noncentrosymmetric crystals
is discussed.
| [
{
"created": "Tue, 16 Jan 2007 15:14:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Baryshevsky",
"V. G.",
""
]
] | CP-violating spin rotation and spin dichroism in noncentrosymmetric crystals is discussed. |
1612.04272 | Renato Fonseca | Renato M. Fonseca, Martin Hirsch | Gauge vectors and double beta decay | Matches the version accepted for publication in Physical Review D | Phys. Rev. D 95, 035033 (2017) | 10.1103/PhysRevD.95.035033 | IFIC/16-50 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss contributions to neutrinoless double beta ($0\nu\beta\beta$) decay
involving vector bosons. The starting point is a list of all possible vector
representations that may contribute to $0\nu\beta\beta$ decay via $d=9$ or
$d=11$ operators at tree-level. We then identify gauge groups which contain
these vectors in the adjoint representation. Even though the complete list of
vector fields that can contribute to $0\nu\beta\beta$ up to $d=11$ is large (a
total of 46 vectors), only a few of them can be gauge bosons of
phenomenologically realistic groups. These latter cases are discussed in some
more detail, and lower (upper) limits on gauge boson masses (mixing angles) are
derived from the absence of $0\nu\beta\beta$ decay.
| [
{
"created": "Tue, 13 Dec 2016 16:40:09 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Feb 2017 17:33:31 GMT",
"version": "v2"
}
] | 2017-03-08 | [
[
"Fonseca",
"Renato M.",
""
],
[
"Hirsch",
"Martin",
""
]
] | We discuss contributions to neutrinoless double beta ($0\nu\beta\beta$) decay involving vector bosons. The starting point is a list of all possible vector representations that may contribute to $0\nu\beta\beta$ decay via $d=9$ or $d=11$ operators at tree-level. We then identify gauge groups which contain these vectors in the adjoint representation. Even though the complete list of vector fields that can contribute to $0\nu\beta\beta$ up to $d=11$ is large (a total of 46 vectors), only a few of them can be gauge bosons of phenomenologically realistic groups. These latter cases are discussed in some more detail, and lower (upper) limits on gauge boson masses (mixing angles) are derived from the absence of $0\nu\beta\beta$ decay. |
hep-ph/9612469 | F. J. Yndurain | K. Adel and F. J. Yndur\'ain | High Energy Photon Deep Inelastic Scattering at Small and Large Q^2 with
Soft Plus Hard Pomeron | PlainTex file, 4 figures | null | null | FTUAM 96-44 | hep-ph | null | We show how the sum of a hard singularity, $F_{2H}(x,Q^2_0)\sim x^{-\lambda}$
and a soft Pomeron $F_{2P}(x,Q^2_0)\sim Const.$ for the singlet piece of the
structure function $F_{2S}=F_{2H}+F_{2P}$ for $Q_0^2\sim a few GeV^2$, plus a
saturating expression for the strong coupling,
$\tilde{\alpha}_s(Q^2)=4\pi/\beta_0 log[(Q^2+\Lambda^2)/\Lambda^2]$ give an
excellent description of experiment
i) For small Q^2, $0\lsim Q^2\leq 8.5 GeV^2$, and
ii) For large Q^2, $10\lsim Q^2\leq 1 500 GeV^2$ if evolved with QCD. The x
range is $6\times10^{-6}\lsim x \lsim 0.04$. The description for low Q^2
implies self-consistent values for the parameters in the exponents of x both
for singlet and nonsinglet. One has to have $\alpha_{\rho}(0)=0.48$ and
$\lambda=0.470 [\alpha_P(0)=1.470]$, in uncanny agreement with other
determinations of these parameters, and in particular the results of the large
Q^2 fits. The fit to data is so good that we may look for signals of a ``triple
Pomeron" vertex, for which some evidence is found.
| [
{
"created": "Thu, 26 Dec 1996 16:35:29 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Adel",
"K.",
""
],
[
"Ynduráin",
"F. J.",
""
]
] | We show how the sum of a hard singularity, $F_{2H}(x,Q^2_0)\sim x^{-\lambda}$ and a soft Pomeron $F_{2P}(x,Q^2_0)\sim Const.$ for the singlet piece of the structure function $F_{2S}=F_{2H}+F_{2P}$ for $Q_0^2\sim a few GeV^2$, plus a saturating expression for the strong coupling, $\tilde{\alpha}_s(Q^2)=4\pi/\beta_0 log[(Q^2+\Lambda^2)/\Lambda^2]$ give an excellent description of experiment i) For small Q^2, $0\lsim Q^2\leq 8.5 GeV^2$, and ii) For large Q^2, $10\lsim Q^2\leq 1 500 GeV^2$ if evolved with QCD. The x range is $6\times10^{-6}\lsim x \lsim 0.04$. The description for low Q^2 implies self-consistent values for the parameters in the exponents of x both for singlet and nonsinglet. One has to have $\alpha_{\rho}(0)=0.48$ and $\lambda=0.470 [\alpha_P(0)=1.470]$, in uncanny agreement with other determinations of these parameters, and in particular the results of the large Q^2 fits. The fit to data is so good that we may look for signals of a ``triple Pomeron" vertex, for which some evidence is found. |
1009.0294 | Jamie Tattersall Mr | Jamie Tattersall, Gudrid Moortgat-Pick, Krzysztof Rolbiecki | CP-violation in SUSY cascades at the LHC | 4 pages, 5 figures; to appear in the proceedings of Physics at the
LHC 2010 (PLHC 2010), Hamburg, Germany, 7-12 June 2010 | null | 10.1103/PhysRevD.83.115012 | DCPT-10-128, IPPP-10-64, DESY-10-117 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the potential to observe CP-violating effects in SUSY cascade decay
chains at the LHC. Asymmetries composed by triple products of momenta of the
final state particles are sensitive to CP-violating effects. Due to large
boosts that dilute the asymmetries, these can be difficult to observe.
Extending the methods of momentum reconstruction we show that the original size
of these asymmetries may be measurable. A study is done at the hadronic level
with backgrounds to estimate the expected sensitivity at the LHC.
| [
{
"created": "Wed, 1 Sep 2010 22:19:43 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Tattersall",
"Jamie",
""
],
[
"Moortgat-Pick",
"Gudrid",
""
],
[
"Rolbiecki",
"Krzysztof",
""
]
] | We study the potential to observe CP-violating effects in SUSY cascade decay chains at the LHC. Asymmetries composed by triple products of momenta of the final state particles are sensitive to CP-violating effects. Due to large boosts that dilute the asymmetries, these can be difficult to observe. Extending the methods of momentum reconstruction we show that the original size of these asymmetries may be measurable. A study is done at the hadronic level with backgrounds to estimate the expected sensitivity at the LHC. |
1202.2672 | Balasubramanian Ananthanarayan | Gauhar Abbas, B.Ananthanarayan, Irinel Caprini | Determination of $\alpha_s(M_{\tau}^2)$ from Improved Fixed Order
Perturbation Theory | 12 pages, 6 figures, uses revtex; replaced with version corresponding
to published version in Physical Review | Phys. Rev. D 85, 094018 (2012) | 10.1103/PhysRevD.85.094018 | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the extraction of $\alpha_s(M_\tau^2)$ from the QCDperturbative
corrections to the hadronic $\tau$ branching ratio, using an improved
fixed-order perturbation theory based on the explicit summation of all
renormalization-group accessible logarithms, proposed some time ago in the
literature. In this approach, the powers of the coupling in the expansion of
the QCD Adler function are multiplied by a set of functions $D_n$, which depend
themselves on the coupling and can be written in a closed form by iteratively
solving a sequence of differential equations. We find that the new expansion
has an improved behavior in the complex energy plane compared to that of the
standard fixed-order perturbation theory (FOPT), and is similar but not
identical to the contour-improved perturbation theory (CIPT). With five terms
in the perturbative expansion we obtain in the ${\bar{\rm MS}}$ scheme $
\alpha_s(M_\tau^2)= 0.338 \pm 0.010$, using as input a precise value for the
perturbative contribution to the hadronic width of the $\tau$ lepton reported
recently in the literature.
| [
{
"created": "Mon, 13 Feb 2012 09:32:59 GMT",
"version": "v1"
},
{
"created": "Sat, 19 May 2012 06:33:14 GMT",
"version": "v2"
}
] | 2012-05-22 | [
[
"Abbas",
"Gauhar",
""
],
[
"Ananthanarayan",
"B.",
""
],
[
"Caprini",
"Irinel",
""
]
] | We revisit the extraction of $\alpha_s(M_\tau^2)$ from the QCDperturbative corrections to the hadronic $\tau$ branching ratio, using an improved fixed-order perturbation theory based on the explicit summation of all renormalization-group accessible logarithms, proposed some time ago in the literature. In this approach, the powers of the coupling in the expansion of the QCD Adler function are multiplied by a set of functions $D_n$, which depend themselves on the coupling and can be written in a closed form by iteratively solving a sequence of differential equations. We find that the new expansion has an improved behavior in the complex energy plane compared to that of the standard fixed-order perturbation theory (FOPT), and is similar but not identical to the contour-improved perturbation theory (CIPT). With five terms in the perturbative expansion we obtain in the ${\bar{\rm MS}}$ scheme $ \alpha_s(M_\tau^2)= 0.338 \pm 0.010$, using as input a precise value for the perturbative contribution to the hadronic width of the $\tau$ lepton reported recently in the literature. |
1905.06334 | Pajares Carlos | I.Bautista, C.Pajares and J.E.Ram\'irez | String percolation in AA and p+p collisions | 26 pages, 36 figures. arXiv admin note: substantial text overlap with
arXiv:1501.01524 | Revista Mexicana de F\'isica 65 (2019) 197-223 | 10.31349/RevMexFis.65.197 | null | hep-ph | http://creativecommons.org/publicdomain/zero/1.0/ | A brief review of the string percolation model and its results are presented
together with the comparison to experimental data. First, it is done an
introduction to the quark-gluon phase diagram and the lattice results
concerning the confinement and the percolation of center domains. It is studied
the interaction of the strings produced in nucleus-nucleus and proton-proton
collisions showing how the string percolation arises. The main consequences of
the string percolation, concerning the dependence on the energy and centrality,
on the multiplicities and the mean transverse momentum are obtained comparing
with experimental data. It is emphasized the non-abelian character of the color
field of the strings forming the cluster to reproduce the rise of the
transverse momentum with multiplicity and the relative suppression of
multiplicities. It is also studied different observables like multiplicity and
transverse momentum distributions, dependence with multiplicity and transverse
momentum correlations, forward-backward correlations, the strength of the
Bose-Einstein correlations, dependence on the multiplicity of $J/\Psi$
production and its possible suppression in pp collisions at high multiplicity,
strangeness enhancement, elliptic flow, and ridge structure. The comparison
with the data shows an overall agreement. The thermodynamical properties of the
extended cluster formed in the collision are discussed computing its energy and
entropy density, shear viscosity over entropy density ratio, bulk viscosity,
sound speed and trace anomaly as a function of temperature, showing a
remarkable agreement with lattice QCD evaluations. The string percolation can
be regarded as the initial frame able to describe the collective behavior
produced in AA and pp collisions.
| [
{
"created": "Wed, 15 May 2019 08:19:49 GMT",
"version": "v1"
}
] | 2019-05-17 | [
[
"Bautista",
"I.",
""
],
[
"Pajares",
"C.",
""
],
[
"Ramírez",
"J. E.",
""
]
] | A brief review of the string percolation model and its results are presented together with the comparison to experimental data. First, it is done an introduction to the quark-gluon phase diagram and the lattice results concerning the confinement and the percolation of center domains. It is studied the interaction of the strings produced in nucleus-nucleus and proton-proton collisions showing how the string percolation arises. The main consequences of the string percolation, concerning the dependence on the energy and centrality, on the multiplicities and the mean transverse momentum are obtained comparing with experimental data. It is emphasized the non-abelian character of the color field of the strings forming the cluster to reproduce the rise of the transverse momentum with multiplicity and the relative suppression of multiplicities. It is also studied different observables like multiplicity and transverse momentum distributions, dependence with multiplicity and transverse momentum correlations, forward-backward correlations, the strength of the Bose-Einstein correlations, dependence on the multiplicity of $J/\Psi$ production and its possible suppression in pp collisions at high multiplicity, strangeness enhancement, elliptic flow, and ridge structure. The comparison with the data shows an overall agreement. The thermodynamical properties of the extended cluster formed in the collision are discussed computing its energy and entropy density, shear viscosity over entropy density ratio, bulk viscosity, sound speed and trace anomaly as a function of temperature, showing a remarkable agreement with lattice QCD evaluations. The string percolation can be regarded as the initial frame able to describe the collective behavior produced in AA and pp collisions. |
2112.14786 | Satyabrata Mahapatra | Debasish Borah (1), Arnab Dasgupta (2), Satyabrata Mahapatra (3) and
Narendra Sahu (3) ((1) Indian Institute of Technology Guwahati, (2)
University of Pittsburgh, (3) Indian Institute of Technology Hyderabad) | Unified Origin of Dark Matter Self-Interactions and Low Scale
Leptogenesis | 9 Pages, 6 Captioned Figures, Version accepted for publication in
Phys. Rev. D | null | 10.1103/PhysRevD.106.095028 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a novel and minimal framework where a light scalar field can give
rise to dark matter (DM) self-interactions, while enhancing the CP symmetry
required for successful baryon asymmetry of the Universe via leptogenesis
route. For demonstration purpose we choose to work in a scotogenic seesaw
scenario where the lightest among the right handed neutrinos (RHN), introduced
for generating light neutrino masses radiatively, play the role of DM while the
heavier two can play non-trivial roles in generating DM relic as well as lepton
asymmetry. While dark matter self-interactions mediated by an additional
singlet scalar can alleviate the small scale issues of cold dark matter
paradigm, the same scalar can give rise to new one-loop decay processes of
heavy RHN into standard model leptons providing an enhanced contribution to CP
asymmetry, even with sub-TeV scale RHN mass. The thermally under-abundant relic
of DM due to large annihilation rates into its light mediator receives a late
non-thermal contribution from a heavier RHN. With only five new particles
involved in the scotogenic seesaw, each having non-trivial roles in generating
DM relic and baryon asymmetry, the model can explain non-zero neutrino mass
while being verifiable at different experiments related to DM direct detection,
flavour physics and colliders. The mechanism we demonstrated here by using a
scotogenic seesaw scenario is also applicable to other models.
| [
{
"created": "Wed, 29 Dec 2021 19:00:29 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Nov 2022 11:58:54 GMT",
"version": "v2"
}
] | 2022-12-07 | [
[
"Borah",
"Debasish",
""
],
[
"Dasgupta",
"Arnab",
""
],
[
"Mahapatra",
"Satyabrata",
""
],
[
"Sahu",
"Narendra",
""
]
] | We propose a novel and minimal framework where a light scalar field can give rise to dark matter (DM) self-interactions, while enhancing the CP symmetry required for successful baryon asymmetry of the Universe via leptogenesis route. For demonstration purpose we choose to work in a scotogenic seesaw scenario where the lightest among the right handed neutrinos (RHN), introduced for generating light neutrino masses radiatively, play the role of DM while the heavier two can play non-trivial roles in generating DM relic as well as lepton asymmetry. While dark matter self-interactions mediated by an additional singlet scalar can alleviate the small scale issues of cold dark matter paradigm, the same scalar can give rise to new one-loop decay processes of heavy RHN into standard model leptons providing an enhanced contribution to CP asymmetry, even with sub-TeV scale RHN mass. The thermally under-abundant relic of DM due to large annihilation rates into its light mediator receives a late non-thermal contribution from a heavier RHN. With only five new particles involved in the scotogenic seesaw, each having non-trivial roles in generating DM relic and baryon asymmetry, the model can explain non-zero neutrino mass while being verifiable at different experiments related to DM direct detection, flavour physics and colliders. The mechanism we demonstrated here by using a scotogenic seesaw scenario is also applicable to other models. |
2202.08622 | Yong-Hui Lin | Yong-Hui Lin | Proton charge radius from a dispersive analysis of the latest space-like
$e$-$p$ scattering data | 5 pages, 7figures, contribution to the proceedings of the 19th
International Conference on Hadron Spectroscopy and Structure in memoriam
Simon Eidelman (HADRON2021) | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a dispersion theoretical analysis of recent date from
electron-proton scattering. This allows for a high-precision extraction of the
electric and magnetic radius of the proton, $r_E = (0.839\pm
0.002{}^{+0.002}_{-0.003})$~fm and $r_M = (0.846\pm
0.001{}^{+0.001}_{-0.005})$~fm, where the first error refers to the statistical
type estimated from the bootstrap method, and the second one refers to the
systematic uncertainty related to the underlying spectral functions.
| [
{
"created": "Thu, 17 Feb 2022 12:16:26 GMT",
"version": "v1"
}
] | 2022-02-18 | [
[
"Lin",
"Yong-Hui",
""
]
] | We present a dispersion theoretical analysis of recent date from electron-proton scattering. This allows for a high-precision extraction of the electric and magnetic radius of the proton, $r_E = (0.839\pm 0.002{}^{+0.002}_{-0.003})$~fm and $r_M = (0.846\pm 0.001{}^{+0.001}_{-0.005})$~fm, where the first error refers to the statistical type estimated from the bootstrap method, and the second one refers to the systematic uncertainty related to the underlying spectral functions. |
2003.13905 | Volodymyr Vovchenko | Volodymyr Vovchenko, Oleh Savchuk, Roman V. Poberezhnyuk, Mark I.
Gorenstein, Volker Koch | Connecting fluctuation measurements in heavy-ion collisions with the
grand-canonical susceptibilities | 7 pages, 2 figures, published version | Phys. Lett. B 811, 135868 (2020) | 10.1016/j.physletb.2020.135868 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the relation between cumulants of a conserved charge measured in a
subvolume of a thermal system and the corresponding grand-canonical
susceptibilities, taking into account exact global conservation of that charge.
The derivation is presented for an arbitrary equation of state, with the
assumption that the subvolume is sufficiently large to be close to the
thermodynamic limit. Our framework -- the subensemble acceptance method (SAM)
-- quantifies the effect of global conservation laws and is an important step
toward a direct comparison between cumulants of conserved charges measured in
central heavy ion collisions and theoretical calculations of grand-canonical
susceptibilities, such as lattice QCD. As an example, we apply our formalism to
net-baryon fluctuations at vanishing baryon chemical potentials as encountered
in collisions at the LHC and RHIC.
| [
{
"created": "Tue, 31 Mar 2020 01:44:47 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Nov 2020 00:43:07 GMT",
"version": "v2"
}
] | 2020-11-04 | [
[
"Vovchenko",
"Volodymyr",
""
],
[
"Savchuk",
"Oleh",
""
],
[
"Poberezhnyuk",
"Roman V.",
""
],
[
"Gorenstein",
"Mark I.",
""
],
[
"Koch",
"Volker",
""
]
] | We derive the relation between cumulants of a conserved charge measured in a subvolume of a thermal system and the corresponding grand-canonical susceptibilities, taking into account exact global conservation of that charge. The derivation is presented for an arbitrary equation of state, with the assumption that the subvolume is sufficiently large to be close to the thermodynamic limit. Our framework -- the subensemble acceptance method (SAM) -- quantifies the effect of global conservation laws and is an important step toward a direct comparison between cumulants of conserved charges measured in central heavy ion collisions and theoretical calculations of grand-canonical susceptibilities, such as lattice QCD. As an example, we apply our formalism to net-baryon fluctuations at vanishing baryon chemical potentials as encountered in collisions at the LHC and RHIC. |
hep-ph/0504223 | Alexander L. Bondarev | Alexander L. Bondarev (NC PHEP BSU) | A new method for calculation of traces of Dirac $\gamma$-matrices in
Minkowski space | 13 pages, LaTeX2E, version to appear in Nuclear Physics B | Nucl.Phys. B733 (2006) 48-58 | 10.1016/j.nuclphysb.2005.10.032 | null | hep-ph hep-th | null | This paper presents some relations for orthonormal bases in the Minkowski
space and isotropic tetrads constructed from the vectors of these bases. As an
example of an application of the obtained formulae, in particular recursion
relations, a new method is proposed to calculate traces of Dirac
$\gamma$-matrices in the Minkowski space. Compared to the classical algorithms,
the new method results in more compact expressions for the traces.
Specifically, it may be easily implemented as a simple yet efficient computer
algorithm.
| [
{
"created": "Mon, 25 Apr 2005 15:00:09 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Nov 2005 14:31:01 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Bondarev",
"Alexander L.",
"",
"NC PHEP BSU"
]
] | This paper presents some relations for orthonormal bases in the Minkowski space and isotropic tetrads constructed from the vectors of these bases. As an example of an application of the obtained formulae, in particular recursion relations, a new method is proposed to calculate traces of Dirac $\gamma$-matrices in the Minkowski space. Compared to the classical algorithms, the new method results in more compact expressions for the traces. Specifically, it may be easily implemented as a simple yet efficient computer algorithm. |
hep-ph/0408031 | Gianpiero Mangano | A.G. Cocco, A. Ereditato, G. Fiorillo, G. Mangano and V. Pettorino | Supernova Relic Neutrinos in Liquid Argon detectors | null | JCAP 0412 (2004) 002 | 10.1088/1475-7516/2004/12/002 | DSF-24/2004 | hep-ph | null | We study the possibility of detecting the background of Supernova Relic
Neutrinos (SRN) with liquid Argon Time Projection Chamber (TPC) detectors. As
far as this study is concerned, these experimental devices are mainly sensitive
to electron neutrino signals, and could provide further information on both
Supernova explosion mechanism and on star formation rate at redshifts z <2. We
study in details the main contributions to background in the relevant energy
range from 8B and hep solar neutrinos as well as from low energy atmospheric
neutrino fluxes. Depending on the theoretical prediction for the SRN flux we
find that for a 3 kton and a 100 kton liquid Argon TPC detectors the signal may
be observed at the 1 sigma and 4 sigma level, respectively, with 5 years of
data taking.
| [
{
"created": "Tue, 3 Aug 2004 10:20:07 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Nov 2004 12:12:25 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Cocco",
"A. G.",
""
],
[
"Ereditato",
"A.",
""
],
[
"Fiorillo",
"G.",
""
],
[
"Mangano",
"G.",
""
],
[
"Pettorino",
"V.",
""
]
] | We study the possibility of detecting the background of Supernova Relic Neutrinos (SRN) with liquid Argon Time Projection Chamber (TPC) detectors. As far as this study is concerned, these experimental devices are mainly sensitive to electron neutrino signals, and could provide further information on both Supernova explosion mechanism and on star formation rate at redshifts z <2. We study in details the main contributions to background in the relevant energy range from 8B and hep solar neutrinos as well as from low energy atmospheric neutrino fluxes. Depending on the theoretical prediction for the SRN flux we find that for a 3 kton and a 100 kton liquid Argon TPC detectors the signal may be observed at the 1 sigma and 4 sigma level, respectively, with 5 years of data taking. |
hep-ph/0003258 | Johan Bijnens | G. Amoros (Helsinki,Lund), J. Bijnens (Lund) and P. Talavera (Lund) | $K_{\ell 4}$ Form-Factors and $\pi$-$\pi$ Scattering | 51 pages | Nucl.Phys. B585 (2000) 293-352; Erratum-ibid. B598 (2001) 665-666 | 10.1016/S0550-3213(00)00366-7 | LU TP 00-11 | hep-ph | null | The $F$ and $G$ form-factors of $K_{\ell4}$ and the quark condensates are
calculated to ${\cal O}(p^6)$ in Chiral Perturbation Theory (CHPT). Full
formulas are presented as much as possible. A full refit of most of the ${\cal
O}(p^4)$ CHPT parameters is done with a discussion of all inputs and underlying
assumptions. We discuss the consequences for the vacuum expectation values,
decay constants, pseudoscalar masses and $\pi$-$\pi$ scattering.
| [
{
"created": "Mon, 27 Mar 2000 10:07:06 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Amoros",
"G.",
"",
"Helsinki,Lund"
],
[
"Bijnens",
"J.",
"",
"Lund"
],
[
"Talavera",
"P.",
"",
"Lund"
]
] | The $F$ and $G$ form-factors of $K_{\ell4}$ and the quark condensates are calculated to ${\cal O}(p^6)$ in Chiral Perturbation Theory (CHPT). Full formulas are presented as much as possible. A full refit of most of the ${\cal O}(p^4)$ CHPT parameters is done with a discussion of all inputs and underlying assumptions. We discuss the consequences for the vacuum expectation values, decay constants, pseudoscalar masses and $\pi$-$\pi$ scattering. |
0805.1885 | Werner Vogelsang | Leandro G. Almeida, George Sterman (Stony Brook), Werner Vogelsang
(BNL) | Threshold Resummation for the Top Quark Charge Asymmetry | 14 pages, 4 figures. One reference added, version to appear in Phys.
Rev. D | Phys.Rev.D78:014008,2008 | 10.1103/PhysRevD.78.014008 | BNL-NT-08/13, YITP-SB-08-15 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the QCD charge asymmetry in t\bar{t} production at the Tevatron. We
investigate the role of higher orders in perturbation theory by considering the
resummation of potentially large logarithmic corrections that arise near
partonic threshold. This requires us to employ the rapidity-dependent anomalous
dimension matrices that describe color mixing due to soft gluon emission in
both quark- and gluon-initiated processes. The charge asymmetry appears
directly in the resummed cross section at next-to-leading logarithm (NLL), and
we find that the first-order expansion of the NLL resummed charge asymmetry
reproduces the known fixed-order result for the asymmetry well. Beyond its
lowest order, the asymmetric component of the cross section is enhanced by the
same leading-logarithmic threshold corrections as the total cross section. As a
result, the charge asymmetry is robust with respect to the higher-order
perturbative corrections generated by threshold resummation. We observe that
the asymmetry increases with pair mass and with scattering angle.
| [
{
"created": "Tue, 13 May 2008 16:52:59 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jul 2008 18:56:45 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Almeida",
"Leandro G.",
"",
"Stony Brook"
],
[
"Sterman",
"George",
"",
"Stony Brook"
],
[
"Vogelsang",
"Werner",
"",
"BNL"
]
] | We study the QCD charge asymmetry in t\bar{t} production at the Tevatron. We investigate the role of higher orders in perturbation theory by considering the resummation of potentially large logarithmic corrections that arise near partonic threshold. This requires us to employ the rapidity-dependent anomalous dimension matrices that describe color mixing due to soft gluon emission in both quark- and gluon-initiated processes. The charge asymmetry appears directly in the resummed cross section at next-to-leading logarithm (NLL), and we find that the first-order expansion of the NLL resummed charge asymmetry reproduces the known fixed-order result for the asymmetry well. Beyond its lowest order, the asymmetric component of the cross section is enhanced by the same leading-logarithmic threshold corrections as the total cross section. As a result, the charge asymmetry is robust with respect to the higher-order perturbative corrections generated by threshold resummation. We observe that the asymmetry increases with pair mass and with scattering angle. |
hep-ph/9910423 | Y. F. Gu | Y.F. Gu, S.F. Tuan | Charmonium Decay Physics | 8 pages, latex, no figures. Invited talk at the 8th International
Conference on Hadron Spectroscopy (Hadron99), Beijing, 24-28 august, 1999; to
appear in Proceedings | Nucl.Phys. A675 (2000) 404c-412c | 10.1016/S0375-9474(00)00297-9 | UH-511-944-99, BIHEP-EP1-99-05 | hep-ph | null | Recent experimental results on the decays of charmonium, together with
related physics issues, are reviewed. Some future prospects are described.
| [
{
"created": "Thu, 21 Oct 1999 01:58:40 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Gu",
"Y. F.",
""
],
[
"Tuan",
"S. F.",
""
]
] | Recent experimental results on the decays of charmonium, together with related physics issues, are reviewed. Some future prospects are described. |
1201.5363 | Nugaev Emin | D. S. Gorbunov, E. Ya. Nugaev | Constraining neutrino superluminality from searches for sterile neutrino
decays | null | null | 10.1016/j.physletb.2012.06.006 | null | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Superluminal neutrinos are expected to lose energy due to bremstrauhlung. It
is dominated by e+e--pair production if kinematically allowed. The same
signature was used in searches for 3-body decays of hypothetical heavy sterile
neutrinos. From the absence of these processes in CERN PS191 and CHARM
experiments we set upper limits on the neutrino velocity in the energy range
from 0.2 GeV to 280 GeV. Our limits are well below the neutrino velocity
favored by the recent OPERA results. For energy-independent neutrino velocity
the limits obtained in this paper are stronger than those coming from ICARUS
experiment and observations of Supernova SN1987a.
| [
{
"created": "Wed, 25 Jan 2012 20:30:07 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Feb 2012 17:21:28 GMT",
"version": "v2"
},
{
"created": "Sun, 20 May 2012 10:25:59 GMT",
"version": "v3"
}
] | 2015-06-03 | [
[
"Gorbunov",
"D. S.",
""
],
[
"Nugaev",
"E. Ya.",
""
]
] | Superluminal neutrinos are expected to lose energy due to bremstrauhlung. It is dominated by e+e--pair production if kinematically allowed. The same signature was used in searches for 3-body decays of hypothetical heavy sterile neutrinos. From the absence of these processes in CERN PS191 and CHARM experiments we set upper limits on the neutrino velocity in the energy range from 0.2 GeV to 280 GeV. Our limits are well below the neutrino velocity favored by the recent OPERA results. For energy-independent neutrino velocity the limits obtained in this paper are stronger than those coming from ICARUS experiment and observations of Supernova SN1987a. |
0908.1266 | Zhi-Gang Wang | Zhi-Gang Wang | Reanalysis of the mass spectrum of the scalar hidden charm and hidden
bottom tetraquark states | 21 pages, 48 figures, 2 tables, slight revision | Eur. Phys. J. C67: 411-423, 2010 | 10.1140/epjc/s10052-010-1302-x | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we study the mass spectrum of the scalar hidden charm and
hidden bottom tetraquark states which consist of the axial-axial type and the
vector-vector type diquark pairs with the QCD sum rules.
| [
{
"created": "Mon, 10 Aug 2009 03:06:13 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Oct 2009 10:01:33 GMT",
"version": "v2"
},
{
"created": "Thu, 17 Dec 2009 02:43:03 GMT",
"version": "v3"
}
] | 2010-06-15 | [
[
"Wang",
"Zhi-Gang",
""
]
] | In this article, we study the mass spectrum of the scalar hidden charm and hidden bottom tetraquark states which consist of the axial-axial type and the vector-vector type diquark pairs with the QCD sum rules. |
hep-ph/9804269 | Guennady Kozlov | G. A. Kozlov | The RNO framework to the $\sigma$-particle mass | LaTeX, 6 pages, no figures and tables | null | null | null | hep-ph | null | The "standard" iso-singlet scalar particle $\sigma$ is reconsidered in the
reduced normal-ordering (RNO) framework to the effective SU(2) theory. Recent
reanalysis of the $\pi\pi$-phase shift [1] is used.
| [
{
"created": "Fri, 10 Apr 1998 08:52:32 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kozlov",
"G. A.",
""
]
] | The "standard" iso-singlet scalar particle $\sigma$ is reconsidered in the reduced normal-ordering (RNO) framework to the effective SU(2) theory. Recent reanalysis of the $\pi\pi$-phase shift [1] is used. |
hep-ph/0108107 | Terry Tomboulis | E. T. Tomboulis (UCLA) | Light fermion mass generation in dynamical symmetry breaking | 12 pages, LaTex file, 11 eps figures | null | null | UCLA/01/TEP/14 | hep-ph | null | We reconsider the question of mass generation for fermions coupled to a set
of gauge bosons when the latter get their masses through the Goldstone bosons
originating in a simple (i.e. not extended) technicolor sector. The fermion
global chiral symmetries are broken by including four-fermion interactions. We
find that the system can be nonperturbatively unstable under fermion mass
fluctuations driving the formation of an effective coupling between the
technigoldstone bosons and the ordinary fermions. Minimization of an effective
action for the corresponding composite operators describes then dynamical
generation of light fermion masses of order M exp(-k/g^2), where M is some
cutoff mass.
| [
{
"created": "Mon, 13 Aug 2001 19:08:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Tomboulis",
"E. T.",
"",
"UCLA"
]
] | We reconsider the question of mass generation for fermions coupled to a set of gauge bosons when the latter get their masses through the Goldstone bosons originating in a simple (i.e. not extended) technicolor sector. The fermion global chiral symmetries are broken by including four-fermion interactions. We find that the system can be nonperturbatively unstable under fermion mass fluctuations driving the formation of an effective coupling between the technigoldstone bosons and the ordinary fermions. Minimization of an effective action for the corresponding composite operators describes then dynamical generation of light fermion masses of order M exp(-k/g^2), where M is some cutoff mass. |
1006.1367 | Francesco D'Eramo | Francesco D'Eramo, Hong Liu and Krishna Rajagopal | Transverse Momentum Broadening and the Jet Quenching Parameter, Redux | 18 pages, 7 figures; v2, minor revisions, references added; v3,
version to appear in Phys. Rev. D: Feynman rules corrected, improved
explanations of the gauge invariance of our calculation and of how the
scaling of SCET operators differs from that in other contexts in the
literature; no changes to any results | Phys.Rev.D84:065015,2011 | 10.1103/PhysRevD.84.065015 | MIT-CTP-4153 | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use Soft Collinear Effective Theory (SCET) to analyze the transverse
momentum broadening, or diffusion in transverse momentum space, of an energetic
parton propagating through quark-gluon plasma. Since we neglect the radiation
of gluons from the energetic parton, we can only discuss momentum broadening,
not parton energy loss. The interaction responsible for momentum broadening in
the absence of radiation is that between the energetic (collinear) parton and
the Glauber modes of the gluon fields in the medium. We derive the effective
Lagrangian for this interaction, and we show that the probability for picking
up transverse momentum k_\perp is given by the Fourier transform of the
expectation value of two transversely separated light-like path-ordered Wilson
lines. This yields a field theoretical definition of the jet quenching
parameter \hat q, and shows that this can be interpreted as a diffusion
constant. We close by revisiting the calculation of \hat q for the strongly
coupled plasma of N=4 SYM theory, showing that previous calculations need some
modifications that make them more straightforward and do not change the result.
| [
{
"created": "Mon, 7 Jun 2010 20:31:09 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Sep 2010 04:42:13 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Aug 2011 14:43:44 GMT",
"version": "v3"
}
] | 2011-11-01 | [
[
"D'Eramo",
"Francesco",
""
],
[
"Liu",
"Hong",
""
],
[
"Rajagopal",
"Krishna",
""
]
] | We use Soft Collinear Effective Theory (SCET) to analyze the transverse momentum broadening, or diffusion in transverse momentum space, of an energetic parton propagating through quark-gluon plasma. Since we neglect the radiation of gluons from the energetic parton, we can only discuss momentum broadening, not parton energy loss. The interaction responsible for momentum broadening in the absence of radiation is that between the energetic (collinear) parton and the Glauber modes of the gluon fields in the medium. We derive the effective Lagrangian for this interaction, and we show that the probability for picking up transverse momentum k_\perp is given by the Fourier transform of the expectation value of two transversely separated light-like path-ordered Wilson lines. This yields a field theoretical definition of the jet quenching parameter \hat q, and shows that this can be interpreted as a diffusion constant. We close by revisiting the calculation of \hat q for the strongly coupled plasma of N=4 SYM theory, showing that previous calculations need some modifications that make them more straightforward and do not change the result. |
1205.0232 | Andrea Tesi | Michele Redi and Andrea Tesi | Implications of a Light Higgs in Composite Models | 19 pages, 11 figures. v2) Minor changes, references added | JHEP 10 (2012) 166 | 10.1007/JHEP10(2012)166 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Higgs mass in composite Higgs models with partial compositeness,
extending the results of Ref. [1] to different representations of the composite
sector for SO(5)/SO(4) and to the coset SO(6)/SO(5). For a given tuning we find
in general a strong correlation between the mass of the top partners and the
Higgs mass, akin to the one in supersymmetry. If the theory is natural a Higgs
mass of 125 GeV typically requires fermionic partners below TeV which might be
within the reach of the present run of LHC. A discussion of CP properties of
both cosets is also presented.
| [
{
"created": "Tue, 1 May 2012 18:58:48 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Sep 2012 14:05:10 GMT",
"version": "v2"
}
] | 2012-10-30 | [
[
"Redi",
"Michele",
""
],
[
"Tesi",
"Andrea",
""
]
] | We study the Higgs mass in composite Higgs models with partial compositeness, extending the results of Ref. [1] to different representations of the composite sector for SO(5)/SO(4) and to the coset SO(6)/SO(5). For a given tuning we find in general a strong correlation between the mass of the top partners and the Higgs mass, akin to the one in supersymmetry. If the theory is natural a Higgs mass of 125 GeV typically requires fermionic partners below TeV which might be within the reach of the present run of LHC. A discussion of CP properties of both cosets is also presented. |
1612.07651 | Michael Spira | Michael Spira | Higgs Boson Production and Decay at Hadron Colliders | 87 pages, 47 figures, substantial update of arXiv:hep-ph/9705337; v2:
version accepted by Progress in Particle and Nuclear Physics, references
updated and text extended, v3: several typos corrected | Prog. Part. Nucl. Phys. 95 (2017) 98 | 10.1016/j.ppnp.2017.04.001 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Higgs physics at hadron colliders as the LHC is reviewed within the Standard
Model (SM) and its minimal supersymmetric extension (MSSM) by summarizing the
present state-of-the-art of theoretical predictions for the production cross
sections and decay rates.
| [
{
"created": "Thu, 22 Dec 2016 15:39:06 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Aug 2017 08:58:02 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Mar 2021 16:39:41 GMT",
"version": "v3"
}
] | 2021-03-15 | [
[
"Spira",
"Michael",
""
]
] | Higgs physics at hadron colliders as the LHC is reviewed within the Standard Model (SM) and its minimal supersymmetric extension (MSSM) by summarizing the present state-of-the-art of theoretical predictions for the production cross sections and decay rates. |
2103.12105 | Yao Ji | Vladimir M. Braun, Yao Ji, and Alexey Vladimirov | QCD factorization for twist-three axial-vector parton quasidistributions | 30 pages, 2 figures; v2: typos fixed, reference added matching
published version | null | 10.1007/JHEP05(2021)086 | SI-HEP-2021-07 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The transverse component of the axial-vector correlation function of quark
fields is a natural starting object for lattice calculations of twist-3 nucleon
parton distribution functions. In this work we derive the corresponding
factorization expression in terms of twist-2 and twist-3 collinear
distributions to one-loop accuracy. The results are presented both in position
space, as the factorization theorem for Ioffe-time distributions, and in
momentum space, for the axial-vector quasi- and pseudodistributions.
| [
{
"created": "Mon, 22 Mar 2021 18:06:37 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Aug 2021 12:21:11 GMT",
"version": "v2"
}
] | 2021-08-09 | [
[
"Braun",
"Vladimir M.",
""
],
[
"Ji",
"Yao",
""
],
[
"Vladimirov",
"Alexey",
""
]
] | The transverse component of the axial-vector correlation function of quark fields is a natural starting object for lattice calculations of twist-3 nucleon parton distribution functions. In this work we derive the corresponding factorization expression in terms of twist-2 and twist-3 collinear distributions to one-loop accuracy. The results are presented both in position space, as the factorization theorem for Ioffe-time distributions, and in momentum space, for the axial-vector quasi- and pseudodistributions. |
hep-ph/0209276 | Dima Kuzmenko | Yu.A.Simonov (ITEP, Moscow) | New developments in nonperturbative QCD | LATEX2e, 10 pages, Invited talk at the conference Q2002, June 2002,
Novgorod, Russia | null | null | null | hep-ph | null | Basic developments in the analytic study of the QCD vacuum structure and of
the QCD spectrum, including glueballs and hybrids are reviewed.
| [
{
"created": "Tue, 24 Sep 2002 08:36:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Simonov",
"Yu. A.",
"",
"ITEP, Moscow"
]
] | Basic developments in the analytic study of the QCD vacuum structure and of the QCD spectrum, including glueballs and hybrids are reviewed. |
2311.09288 | Anders Eller Thomsen Ph.D. | Stefan Antusch, Admir Greljo, Ben A. Stefanek, Anders Eller Thomsen | U(2) is Right for Leptons and Left for Quarks | 8 pages, 1 figure. v2: updated discussion of the GUT symmetry | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We posit that the distinct patterns observed in fermion masses and mixings
are due to a minimally broken $\mathrm{U}(2)_{q+e}$ flavor symmetry acting on
left-handed quarks and right-handed charged leptons, giving rise to an
accidental $\mathrm{U}(2)^5$ symmetry at the renormalizable level without
imposing selection rules on the Weinberg operator. We show that the symmetry
can be consistently gauged by explicit examples and comment on realizations in
$\mathrm{SU}(5)$ unification. Via a model-independent SMEFT analysis, we find
that selection rules due to $\mathrm{U}(2)_{q+e}$ enhance the importance of
charged lepton flavor violation as a probe, where significant experimental
progress is expected in the near future.
| [
{
"created": "Wed, 15 Nov 2023 19:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Feb 2024 18:08:15 GMT",
"version": "v2"
}
] | 2024-02-28 | [
[
"Antusch",
"Stefan",
""
],
[
"Greljo",
"Admir",
""
],
[
"Stefanek",
"Ben A.",
""
],
[
"Thomsen",
"Anders Eller",
""
]
] | We posit that the distinct patterns observed in fermion masses and mixings are due to a minimally broken $\mathrm{U}(2)_{q+e}$ flavor symmetry acting on left-handed quarks and right-handed charged leptons, giving rise to an accidental $\mathrm{U}(2)^5$ symmetry at the renormalizable level without imposing selection rules on the Weinberg operator. We show that the symmetry can be consistently gauged by explicit examples and comment on realizations in $\mathrm{SU}(5)$ unification. Via a model-independent SMEFT analysis, we find that selection rules due to $\mathrm{U}(2)_{q+e}$ enhance the importance of charged lepton flavor violation as a probe, where significant experimental progress is expected in the near future. |
1001.3278 | Tianjun Li | Xin Gao, Zhaofeng Kang, Tianjun Li | The Supersymmetric Standard Models with Decay and Stable Dark Matters | RevTex4, 26 pages, 6 figures, references added, version to appear in
EPJC | Eur.Phys.J.C69:467-480,2010 | 10.1140/epjc/s10052-010-1418-z | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose two supersymmetric Standard Models (SMs) with decaying and stable
dark matter (DM) particles. To explain the SM fermion masses and mixings and
have a heavy decay DM particle S, we consider the Froggatt-Nielsen mechanism by
introducing an anomalous U(1)_X gauge symmetry. Around the string scale, the
U(1)_X gauge symmetry is broken down to a Z_2 symmetry under which S is odd
while all the SM particles are even. S obtains a vacuum expectation value
around the TeV scale, and then it can three-body decay dominantly to the
second/third family of the SM leptons in Model I and to the first family of the
SM leptons in Model II. Choosing a benchmark point in the constrained minimal
supersymmetric SM with exact R parity, we show that the lightest neutralino DM
is consistent with the CDMS II experiment. Considering S three-body decay and
choosing suitable parameters, we show that the PAMELA and Fermi-LAT experiments
and the PAMELA and ATIC experiments can be explained in Model I and Model II,
respectively.
| [
{
"created": "Tue, 19 Jan 2010 12:17:34 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Aug 2010 15:44:52 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Gao",
"Xin",
""
],
[
"Kang",
"Zhaofeng",
""
],
[
"Li",
"Tianjun",
""
]
] | We propose two supersymmetric Standard Models (SMs) with decaying and stable dark matter (DM) particles. To explain the SM fermion masses and mixings and have a heavy decay DM particle S, we consider the Froggatt-Nielsen mechanism by introducing an anomalous U(1)_X gauge symmetry. Around the string scale, the U(1)_X gauge symmetry is broken down to a Z_2 symmetry under which S is odd while all the SM particles are even. S obtains a vacuum expectation value around the TeV scale, and then it can three-body decay dominantly to the second/third family of the SM leptons in Model I and to the first family of the SM leptons in Model II. Choosing a benchmark point in the constrained minimal supersymmetric SM with exact R parity, we show that the lightest neutralino DM is consistent with the CDMS II experiment. Considering S three-body decay and choosing suitable parameters, we show that the PAMELA and Fermi-LAT experiments and the PAMELA and ATIC experiments can be explained in Model I and Model II, respectively. |
hep-ph/0502158 | Gregory Soyez | G. Soyez | New insight in global QCD fits using Regge theory | 7 pages, 5 figures, proceedings for the HPLR 2004 meeting, 16-18
december 2004, Spa, Belgium | null | null | null | hep-ph | null | In global QCD fits, one has to choose an initial parton distribution at
Q^2=Q_0^2. I shall argue that the initial condition choses in usual standard
sets is inconsistent with analytic S-matrix theory. I shall show how one can
combine these two approaches, leading to a Regge-compatible next-to-leading
order global QCD fit. This allows one to extend the parametrisation in the
low-Q^2 region. Finally, I shall discuss how it it possible to use the
Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) equation to obtain
information on Regge models at high Q^2.
| [
{
"created": "Thu, 17 Feb 2005 17:58:46 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Feb 2005 13:15:14 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Soyez",
"G.",
""
]
] | In global QCD fits, one has to choose an initial parton distribution at Q^2=Q_0^2. I shall argue that the initial condition choses in usual standard sets is inconsistent with analytic S-matrix theory. I shall show how one can combine these two approaches, leading to a Regge-compatible next-to-leading order global QCD fit. This allows one to extend the parametrisation in the low-Q^2 region. Finally, I shall discuss how it it possible to use the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) equation to obtain information on Regge models at high Q^2. |
1404.3859 | Guido Altarelli | Guido Altarelli | Status of Neutrino Mass and Mixing | 18 pages, 1 figure. Talk presented at the International Conference on
Flavor Physics and Mass Generation, Singapore, February 2014. arXiv admin
note: substantial text overlap with arXiv:1312.1107, arXiv:1304.5047,
arXiv:1111.6421, arXiv:1210.3467, arXiv:hep-ph/0405048 | null | 10.1142/S0217751X14440023 | RM3-TH/14-6; CERN-PH-TH/2014-066 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the last two decades experiments have established the existence of
neutrino oscillations and most of the related parameters have by now been
measured with reasonable accuracy. These results have accomplished a major
progress for particle physics and cosmology. At present neutrino physics is a
most vital domain of particle physics and cosmology and the existing open
questions are of crucial importance. We review the present status of the
subject, the main lessons that we have learnt so far and discuss the great
challenges that remain in this field.
| [
{
"created": "Tue, 15 Apr 2014 10:23:27 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Altarelli",
"Guido",
""
]
] | In the last two decades experiments have established the existence of neutrino oscillations and most of the related parameters have by now been measured with reasonable accuracy. These results have accomplished a major progress for particle physics and cosmology. At present neutrino physics is a most vital domain of particle physics and cosmology and the existing open questions are of crucial importance. We review the present status of the subject, the main lessons that we have learnt so far and discuss the great challenges that remain in this field. |
hep-ph/0111258 | J. F. de Troconiz | J. F. de Troc\'oniz and F. J. Yndur\'ain | Precision Determination of the Muon $g_{\mu}-2$ and $\bar{\alpha}_{\rm
Q.E.D.}(M^2_{Z})$ | 6 pages, 2 figures, To appear in the Proceedings of the Budapest 2001
EPS HEP Conference | null | null | null | hep-ph | null | We present a summary of the results of two recent precise calculations of the
muon anomalous magnetic moment ($g_{\mu}-2$) and the electromagnetic coupling
on the $Z$ ($\bar{\alpha}_{\rm Q.E.D.}(M^2_{Z})$). The main sources of
uncertainty are underlined.
| [
{
"created": "Wed, 21 Nov 2001 10:45:28 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"de Trocóniz",
"J. F.",
""
],
[
"Ynduráin",
"F. J.",
""
]
] | We present a summary of the results of two recent precise calculations of the muon anomalous magnetic moment ($g_{\mu}-2$) and the electromagnetic coupling on the $Z$ ($\bar{\alpha}_{\rm Q.E.D.}(M^2_{Z})$). The main sources of uncertainty are underlined. |
hep-ph/0610041 | Boris Kopeliovich | B.Z. Kopeliovich, Ivan Schmidt, A.V. Tarasov, O.O. Voskresenskaya | Dipole description of inclusive particle production | Latex, 11 pages, 2 figures | J.Phys.G34:335,2007 | 10.1088/0954-3899/34/2/012 | USM-TH-196 | hep-ph | null | The effects of multiple interactions in colliding particles (e.g. in
nucleus-nucleus collisions) are modeled using the light-cone dipole approach.
Guided by the abelian analogue of multi-photon interactions in the production
of a pair of charged particles, we relate the inclusive cross section of quark
pair production with the cross sections of interaction of a QCD dipole with
either the beam or the target.
| [
{
"created": "Wed, 4 Oct 2006 18:04:48 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kopeliovich",
"B. Z.",
""
],
[
"Schmidt",
"Ivan",
""
],
[
"Tarasov",
"A. V.",
""
],
[
"Voskresenskaya",
"O. O.",
""
]
] | The effects of multiple interactions in colliding particles (e.g. in nucleus-nucleus collisions) are modeled using the light-cone dipole approach. Guided by the abelian analogue of multi-photon interactions in the production of a pair of charged particles, we relate the inclusive cross section of quark pair production with the cross sections of interaction of a QCD dipole with either the beam or the target. |
hep-ph/0409256 | Romuald A. Janik | Romuald A. Janik | QCD saturation in the dipole sector with correlations | 9 pages, v2: references and comments added, v3: version to appear in
Phys. Lett. B (title changed in journal) | null | 10.1016/j.physletb.2004.11.007 | null | hep-ph | null | In this paper we study the description of saturation in Balitsky,
Jalilian-Marian, Iancu, McLerran, Weigert, Leonidov and Kovner (B-JIMWLK)
picture when restricted to observables made up only from dipole operators. We
derive a functional form of the evolution equation for the dipole probability
distribution and find a one-parameter family of exact solutions to the dipole
evolution equations.
| [
{
"created": "Wed, 22 Sep 2004 12:40:22 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Sep 2004 23:34:42 GMT",
"version": "v2"
},
{
"created": "Sat, 13 Nov 2004 00:42:10 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Janik",
"Romuald A.",
""
]
] | In this paper we study the description of saturation in Balitsky, Jalilian-Marian, Iancu, McLerran, Weigert, Leonidov and Kovner (B-JIMWLK) picture when restricted to observables made up only from dipole operators. We derive a functional form of the evolution equation for the dipole probability distribution and find a one-parameter family of exact solutions to the dipole evolution equations. |
1604.02574 | Raquel Molina Ms. | R. Molina, M. D\"oring and E. Oset | Determination of the compositeness of resonances from decays: the case
of the $B^0_s\to J/\psi f_1(1285)$ | 9 figures | Phys. Rev. D 93, 114004 (2016) | 10.1103/PhysRevD.93.114004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a method to measure the amount of compositeness of a resonance,
mostly made as a bound state of two hadrons, by simultaneously measuring the
rate of production of the resonance and the mass distribution of the two
hadrons close to threshold. By using different methods of analysis we conclude
that the method allows one to extract the value of 1-Z with about $0.1$ of
uncertainty. The method is applied to the case of the $\bar B^0_s \to J/\psi
f_1(1285)$ decay, by looking at the resonance production and the mass
distribution of $K \bar K^*$.
| [
{
"created": "Sat, 9 Apr 2016 15:17:53 GMT",
"version": "v1"
}
] | 2016-06-15 | [
[
"Molina",
"R.",
""
],
[
"Döring",
"M.",
""
],
[
"Oset",
"E.",
""
]
] | We develop a method to measure the amount of compositeness of a resonance, mostly made as a bound state of two hadrons, by simultaneously measuring the rate of production of the resonance and the mass distribution of the two hadrons close to threshold. By using different methods of analysis we conclude that the method allows one to extract the value of 1-Z with about $0.1$ of uncertainty. The method is applied to the case of the $\bar B^0_s \to J/\psi f_1(1285)$ decay, by looking at the resonance production and the mass distribution of $K \bar K^*$. |
0810.4115 | Ana Julia Mizher | Ana J\'ulia Mizher, Eduardo S. Fraga | CP Violation in the Linear Sigma Model | 4 pages | Nucl.Phys.A820:247c-250c,2009 | 10.1016/j.nuclphysa.2009.01.061 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the possibility of the formation of CP-odd domains in heavy ion
collisions, we investigate the effects of CP violation on the chiral transition
within the linear sigma model with two flavors of quarks. We also study how the
CP-odd system is affected by the presence of a strong magnetic field, that is
presumably generated in a non-central heavy ion collision. We find that both
ingredients play an important role, influencing drastically the nature of the
phase transition and the critical temperature.
| [
{
"created": "Wed, 22 Oct 2008 17:32:14 GMT",
"version": "v1"
}
] | 2010-04-21 | [
[
"Mizher",
"Ana Júlia",
""
],
[
"Fraga",
"Eduardo S.",
""
]
] | Motivated by the possibility of the formation of CP-odd domains in heavy ion collisions, we investigate the effects of CP violation on the chiral transition within the linear sigma model with two flavors of quarks. We also study how the CP-odd system is affected by the presence of a strong magnetic field, that is presumably generated in a non-central heavy ion collision. We find that both ingredients play an important role, influencing drastically the nature of the phase transition and the critical temperature. |
2407.14345 | Matteo Buzzegoli | M. Buzzegoli (Iowa State University and West University of Timisoara)
and A. Palermo (Stony Brook) | Emergent canonical spin tensor in the chiral symmetric hot QCD | 5 pages, comments welcome. v2: updated discussion | null | null | null | hep-ph hep-th nucl-th | http://creativecommons.org/licenses/by/4.0/ | The spin tensor is fundamental to relativistic spin hydrodynamics, but its
definition is ambiguous due to the pseudogauge symmetry. We show that this
ambiguity can be solved in interacting field theories. We prove that the mean
field limit of the Nambu-Jona-Lasinio model with spin-spin interactions is
equivalent to non-dissipative spin hydrodynamics with a canonical spin tensor.
| [
{
"created": "Fri, 19 Jul 2024 14:28:48 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jul 2024 06:17:33 GMT",
"version": "v2"
}
] | 2024-07-30 | [
[
"Buzzegoli",
"M.",
"",
"Iowa State University and West University of Timisoara"
],
[
"Palermo",
"A.",
"",
"Stony Brook"
]
] | The spin tensor is fundamental to relativistic spin hydrodynamics, but its definition is ambiguous due to the pseudogauge symmetry. We show that this ambiguity can be solved in interacting field theories. We prove that the mean field limit of the Nambu-Jona-Lasinio model with spin-spin interactions is equivalent to non-dissipative spin hydrodynamics with a canonical spin tensor. |
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