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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1409.6508 | Kiyoharu Kawana | Yuta Hamada, Hikaru Kawai, Kiyoharu Kawana | Weak Scale From the Maximum Entropy Principle | 21 pages, 10 figures; references added, version to appear in PTEP
(v2) | Prog. Theor. Exp. Phys. 2015, 033B06 | 10.1093/ptep/ptv011 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The theory of multiverse and wormholes suggests that the parameters of the
Standard Model are fixed in such a way that the radiation of the $S^{3}$
universe at the final stage $S_{rad}$ becomes maximum, which we call the
maximum entropy principle. Although it is difficult to confirm this principle
generally, for a few parameters of the Standard Model, we can check whether
$S_{rad}$ actually becomes maximum at the observed values. In this paper, we
regard $S_{rad}$ at the final stage as a function of the weak scale ( the Higgs
expectation value ) $v_{h}$, and show that it becomes maximum around
$v_{h}={\cal{O}}(300\text{GeV})$ when the dimensionless couplings in the
Standard Model, that is, the Higgs self coupling, the gauge couplings, and the
Yukawa couplings are fixed. Roughly speaking, we find that the weak scale is
given by \begin{equation}
v_{h}\sim\frac{T_{BBN}^{2}}{M_{pl}y_{e}^{5}},\nonumber\end{equation} where
$y_{e}$ is the Yukawa coupling of electron, $T_{BBN}$ is the temperature where
the Big Bang Nucleosynthesis starts and $M_{pl}$ is the Planck mass.
| [
{
"created": "Tue, 23 Sep 2014 12:28:16 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Mar 2015 10:17:01 GMT",
"version": "v2"
}
] | 2015-03-31 | [
[
"Hamada",
"Yuta",
""
],
[
"Kawai",
"Hikaru",
""
],
[
"Kawana",
"Kiyoharu",
""
]
] | The theory of multiverse and wormholes suggests that the parameters of the Standard Model are fixed in such a way that the radiation of the $S^{3}$ universe at the final stage $S_{rad}$ becomes maximum, which we call the maximum entropy principle. Although it is difficult to confirm this principle generally, for a few parameters of the Standard Model, we can check whether $S_{rad}$ actually becomes maximum at the observed values. In this paper, we regard $S_{rad}$ at the final stage as a function of the weak scale ( the Higgs expectation value ) $v_{h}$, and show that it becomes maximum around $v_{h}={\cal{O}}(300\text{GeV})$ when the dimensionless couplings in the Standard Model, that is, the Higgs self coupling, the gauge couplings, and the Yukawa couplings are fixed. Roughly speaking, we find that the weak scale is given by \begin{equation} v_{h}\sim\frac{T_{BBN}^{2}}{M_{pl}y_{e}^{5}},\nonumber\end{equation} where $y_{e}$ is the Yukawa coupling of electron, $T_{BBN}$ is the temperature where the Big Bang Nucleosynthesis starts and $M_{pl}$ is the Planck mass. |
2202.08013 | Akira Watanabe | Zhibo Liu, Wei Xie, Fei Sun, Shuang Li, Akira Watanabe | Elastic pion-proton and pion-pion scattering at high energies in
holographic QCD | 9 pages, 5 figures, version accepted for publication in Phys. Rev. D | null | 10.1103/PhysRevD.106.054025 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The total and differential cross sections of high energy pion-proton and
pion-pion scattering are investigated in a holographic QCD model, focusing on
the Regge regime in which the Pomeron exchange gives the dominant contribution
to those cross sections. The Pomeron is described by the Reggeized spin-2
particle propagator, and the hadron-Pomeron couplings are given by
gravitational form factors of the hadrons, which are obtained from the
bottom-up AdS/QCD models. Since the parameters, which characterize the Pomeron
trajectory, have been determined in a preceding study of the proton-proton
scattering, the pion-proton cross sections can be expressed with a single
adjustable parameter. Once this parameter is determined by the experimental
data of the pion-proton total cross section, its differential cross section and
the pion-pion cross sections can be calculated without any additional
parameter. Although the currently available data are limited, it is found that
our calculation is consistent with those. Our predictions are explicitly shown,
and the present model can be tested at the future experimental facilities.
| [
{
"created": "Wed, 16 Feb 2022 12:03:32 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Sep 2022 05:26:46 GMT",
"version": "v2"
}
] | 2022-10-05 | [
[
"Liu",
"Zhibo",
""
],
[
"Xie",
"Wei",
""
],
[
"Sun",
"Fei",
""
],
[
"Li",
"Shuang",
""
],
[
"Watanabe",
"Akira",
""
]
] | The total and differential cross sections of high energy pion-proton and pion-pion scattering are investigated in a holographic QCD model, focusing on the Regge regime in which the Pomeron exchange gives the dominant contribution to those cross sections. The Pomeron is described by the Reggeized spin-2 particle propagator, and the hadron-Pomeron couplings are given by gravitational form factors of the hadrons, which are obtained from the bottom-up AdS/QCD models. Since the parameters, which characterize the Pomeron trajectory, have been determined in a preceding study of the proton-proton scattering, the pion-proton cross sections can be expressed with a single adjustable parameter. Once this parameter is determined by the experimental data of the pion-proton total cross section, its differential cross section and the pion-pion cross sections can be calculated without any additional parameter. Although the currently available data are limited, it is found that our calculation is consistent with those. Our predictions are explicitly shown, and the present model can be tested at the future experimental facilities. |
1305.1817 | Giorgio Busoni | Giorgio Busoni, Andrea De Simone, Wei-Chih Huang | On the Minimum Dark Matter Mass Testable by Neutrinos from the Sun | 15 pages, 6 figures, v2: Figure 6 corrected | JCAP 1307:010,2013 | 10.1088/1475-7516/2013/07/010 | CERN-PH-TH/2013-091, SISSA 19/2013/FISI | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a limitation on extracting bounds on the scattering cross section
of dark matter with nucleons, using neutrinos from the Sun. If the dark matter
particle is sufficiently light (less than about 4 GeV), the effect of
evaporation is not negligible and the capture process goes in equilibrium with
the evaporation. In this regime, the flux of solar neutrinos of dark matter
origin becomes independent of the scattering cross section and therefore no
constraint can be placed on it. We find the minimum values of dark matter
masses for which the scattering cross section on nucleons can be probed using
neutrinos from the Sun. We also provide simple and accurate fitting functions
for all the relevant processes of GeV-scale dark matter in the Sun.
| [
{
"created": "Wed, 8 May 2013 13:42:41 GMT",
"version": "v1"
},
{
"created": "Fri, 10 May 2013 08:29:55 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Jul 2013 17:41:49 GMT",
"version": "v3"
}
] | 2013-07-09 | [
[
"Busoni",
"Giorgio",
""
],
[
"De Simone",
"Andrea",
""
],
[
"Huang",
"Wei-Chih",
""
]
] | We discuss a limitation on extracting bounds on the scattering cross section of dark matter with nucleons, using neutrinos from the Sun. If the dark matter particle is sufficiently light (less than about 4 GeV), the effect of evaporation is not negligible and the capture process goes in equilibrium with the evaporation. In this regime, the flux of solar neutrinos of dark matter origin becomes independent of the scattering cross section and therefore no constraint can be placed on it. We find the minimum values of dark matter masses for which the scattering cross section on nucleons can be probed using neutrinos from the Sun. We also provide simple and accurate fitting functions for all the relevant processes of GeV-scale dark matter in the Sun. |
1207.5787 | Joshua T. Ruderman | Joshua T. Ruderman, Tracy R. Slatyer, Neal Weiner | A Collective Breaking of R-Parity | 28 pages, 10 figures | null | 10.1007/JHEP09(2013)094 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Supersymmetric theories with an R-parity generally yield a striking missing
energy signature, with cascade decays concluding in a neutralino that escapes
the detector. In theories where R-parity is broken the missing energy is
replaced with additional jets or leptons, often making traditional search
strategies ineffective. Such R-parity violation is very constrained, however,
by resulting B and L violating signals, requiring couplings so small that LSPs
will decay outside the detector in all but a few scenarios. In theories with
additional matter fields, R-parity can be broken collectively, such that
R-parity is not broken by any single coupling, but only by an ensemble of
couplings. Cascade decays can proceed normally, with each step only sensitive
to one or two couplings at a time, but B and L violation requires the full set,
yielding a highly suppressed constraint. s-channel production of new scalar
states, typically small for standard RPV, can be large when RPV is broken
collectively. While missing energy is absent, making these models difficult to
discover by traditional SUSY searches, they produce complicated many object
resonances (MORes), with many different possible numbers of jets and leptons.
We outline a simple model and discuss its discoverability at the LHC.
| [
{
"created": "Tue, 24 Jul 2012 19:59:19 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Ruderman",
"Joshua T.",
""
],
[
"Slatyer",
"Tracy R.",
""
],
[
"Weiner",
"Neal",
""
]
] | Supersymmetric theories with an R-parity generally yield a striking missing energy signature, with cascade decays concluding in a neutralino that escapes the detector. In theories where R-parity is broken the missing energy is replaced with additional jets or leptons, often making traditional search strategies ineffective. Such R-parity violation is very constrained, however, by resulting B and L violating signals, requiring couplings so small that LSPs will decay outside the detector in all but a few scenarios. In theories with additional matter fields, R-parity can be broken collectively, such that R-parity is not broken by any single coupling, but only by an ensemble of couplings. Cascade decays can proceed normally, with each step only sensitive to one or two couplings at a time, but B and L violation requires the full set, yielding a highly suppressed constraint. s-channel production of new scalar states, typically small for standard RPV, can be large when RPV is broken collectively. While missing energy is absent, making these models difficult to discover by traditional SUSY searches, they produce complicated many object resonances (MORes), with many different possible numbers of jets and leptons. We outline a simple model and discuss its discoverability at the LHC. |
1506.03996 | Mohammad Rahim Talebtash | Mohammad Rahim Talebtash, Hossein Mehraban | Non-resonant four-body decay of $B \to D^- \pi^+\pi^+\pi^- $ | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the branching ratio of the non-resonant $B \to D^-
\pi^+\pi^+\pi^- $ decay using a simple model based on the framework of the
factorization approach. In naive factorization approach, there are only tow
tree diagrams for this decay mode. In the first diagram, the matrix element of
decay mode is factorized into a $B\to D$ form factor multiplied by a $3\pi$
decay constant and in the second diagram, the matrix element is factorized into
a $B\to D\pi$ form factor multiplied by a $2\pi$ decay constant, We assume that
in the rest frame of B meson, the $D$ meson remains stationary, so we obtain
the value $(3.47\pm0.14)\times 10^{-3}$ for the branching ration of the $B \to
D^- \pi^+\pi^+\pi^- $ decay mode, while the experimental results are
$(3.9\pm1.9)\times10^{-3}$.
| [
{
"created": "Fri, 12 Jun 2015 11:53:26 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Dec 2015 13:18:41 GMT",
"version": "v2"
}
] | 2015-12-08 | [
[
"Talebtash",
"Mohammad Rahim",
""
],
[
"Mehraban",
"Hossein",
""
]
] | We calculate the branching ratio of the non-resonant $B \to D^- \pi^+\pi^+\pi^- $ decay using a simple model based on the framework of the factorization approach. In naive factorization approach, there are only tow tree diagrams for this decay mode. In the first diagram, the matrix element of decay mode is factorized into a $B\to D$ form factor multiplied by a $3\pi$ decay constant and in the second diagram, the matrix element is factorized into a $B\to D\pi$ form factor multiplied by a $2\pi$ decay constant, We assume that in the rest frame of B meson, the $D$ meson remains stationary, so we obtain the value $(3.47\pm0.14)\times 10^{-3}$ for the branching ration of the $B \to D^- \pi^+\pi^+\pi^- $ decay mode, while the experimental results are $(3.9\pm1.9)\times10^{-3}$. |
1807.00530 | Junmou Chen | Junmou Chen, Pyungwon Ko, Hsiang-nan Li, Jinmian Li, Hiroshi Yokoya | Light Dark Matter Showering under Broken Dark $U(1)$ -- Revisited | 18 pages, 6 figures | null | 10.1007/JHEP01(2019)141 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It was proposed recently that different chiralities of the dark matter (DM)
fermion under a broken dark U(1) gauge group can lead to distinguishable
signatures at the LHC through shower patterns, which may reveal the mass origin
of the dark sector. We study this subject further by examining the dark shower
of two simplified models, the dubbed Chiral Model and the Vector Model. We
derive a more complete set of collinear splitting functions with power
corrections, specifying the helicities of the initial DM fermion and including
the contribution from an extra degree of freedom, the dark Higgs boson. The
dark shower is then implemented with these splitting functions, and the new
features resulting from its correct modelling are emphasized. It is shown that
the DM fermion chirality can be differentiated by measuring dark shower
patterns, especially the DM jet energy profile, which is almost independent of
the DM energy.
| [
{
"created": "Mon, 2 Jul 2018 08:38:09 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Jul 2018 08:54:37 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Nov 2018 11:28:15 GMT",
"version": "v3"
}
] | 2019-02-20 | [
[
"Chen",
"Junmou",
""
],
[
"Ko",
"Pyungwon",
""
],
[
"Li",
"Hsiang-nan",
""
],
[
"Li",
"Jinmian",
""
],
[
"Yokoya",
"Hiroshi",
""
]
] | It was proposed recently that different chiralities of the dark matter (DM) fermion under a broken dark U(1) gauge group can lead to distinguishable signatures at the LHC through shower patterns, which may reveal the mass origin of the dark sector. We study this subject further by examining the dark shower of two simplified models, the dubbed Chiral Model and the Vector Model. We derive a more complete set of collinear splitting functions with power corrections, specifying the helicities of the initial DM fermion and including the contribution from an extra degree of freedom, the dark Higgs boson. The dark shower is then implemented with these splitting functions, and the new features resulting from its correct modelling are emphasized. It is shown that the DM fermion chirality can be differentiated by measuring dark shower patterns, especially the DM jet energy profile, which is almost independent of the DM energy. |
1807.10273 | Gauthier Durieux | Gauthier Durieux and Oleksii Matsedonskyi | The top-quark window on compositeness at future lepton colliders | 20 pages, 2 figures, 3 tables | null | 10.1007/JHEP01(2019)072 | DESY 18-114 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | In composite Higgs (CH) models, large mixings between the top quark and the
new strongly interacting sector are required to generate its sizeable Yukawa
coupling. Precise measurements involving top as well as left-handed bottom
quarks therefore offer an interesting opportunity to probe such new physics
scenarios. We study the impact of third-generation-quark pair production at
future lepton colliders, translating prospective effective-field-theory
sensitivities into the CH parameter space. Our results show that one can probe
a significant fraction of the natural CH parameter space through the top
portal, especially at TeV centre-of-mass energies.
| [
{
"created": "Thu, 26 Jul 2018 17:59:00 GMT",
"version": "v1"
}
] | 2019-01-30 | [
[
"Durieux",
"Gauthier",
""
],
[
"Matsedonskyi",
"Oleksii",
""
]
] | In composite Higgs (CH) models, large mixings between the top quark and the new strongly interacting sector are required to generate its sizeable Yukawa coupling. Precise measurements involving top as well as left-handed bottom quarks therefore offer an interesting opportunity to probe such new physics scenarios. We study the impact of third-generation-quark pair production at future lepton colliders, translating prospective effective-field-theory sensitivities into the CH parameter space. Our results show that one can probe a significant fraction of the natural CH parameter space through the top portal, especially at TeV centre-of-mass energies. |
1012.1093 | Tillmann Heidsieck | Tillmann Heidsieck | Flavour physics with a 4th generation | Based on a talk given at the 6th International Workshop on the CKM
Unitarity Triangle, Warwick, England, September 6th - 10th, 2010 | null | null | TUM-HEP-784/10 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an overview of recent work on flavour physics in the presence of a
sequential fourth generation. We will discuss shortly the constraints on the
new parameters and in the reminder present predictions for observables like
Br(B_s -> mu+ mu-), Br(K -> pi nu nubar) and the indirect CP violation S(psi
phi) in the B_s system. We will further stress the importance of
epsilon'/epsilon as a possible constraint once reliable lattice results for B_6
and B_8 become available. Lepton flavour violation is also briefly discussed in
view of prospects for tau physics at an upgraded flavour factory as well as
upcoming experiments for mu -> e gamma and mu-e conversion in nuclei.
| [
{
"created": "Mon, 6 Dec 2010 08:38:28 GMT",
"version": "v1"
}
] | 2010-12-07 | [
[
"Heidsieck",
"Tillmann",
""
]
] | We present an overview of recent work on flavour physics in the presence of a sequential fourth generation. We will discuss shortly the constraints on the new parameters and in the reminder present predictions for observables like Br(B_s -> mu+ mu-), Br(K -> pi nu nubar) and the indirect CP violation S(psi phi) in the B_s system. We will further stress the importance of epsilon'/epsilon as a possible constraint once reliable lattice results for B_6 and B_8 become available. Lepton flavour violation is also briefly discussed in view of prospects for tau physics at an upgraded flavour factory as well as upcoming experiments for mu -> e gamma and mu-e conversion in nuclei. |
hep-ph/0510062 | Carlos A. Salgado | Carlos A. Salgado | RHIC results from LHC perspectives | 10 pages, 5 figures. Plenary talk given at Quark Matter 2005
Conference, Budapest, Hungary, 4-9 Aug 2005 | Nucl.Phys. A774 (2006) 267-276 | 10.1016/j.nuclphysa.2006.06.047 | CERN-PH-TH/2005-191 | hep-ph | null | RHIC data opens new ways of characterizing the medium created in a heavy ion
collision by measuring particles with high transverse momentum. In addition to
the observation of the predicted jet quenching, the new data on particle
correlations indicate that a strong modification of the jet-like shapes is
driven by the dynamical properties of the medium. I will review the lessons we
are learning from RHIC and outline some new directions which could become of
primary importance at the LHC.
| [
{
"created": "Wed, 5 Oct 2005 17:32:41 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Salgado",
"Carlos A.",
""
]
] | RHIC data opens new ways of characterizing the medium created in a heavy ion collision by measuring particles with high transverse momentum. In addition to the observation of the predicted jet quenching, the new data on particle correlations indicate that a strong modification of the jet-like shapes is driven by the dynamical properties of the medium. I will review the lessons we are learning from RHIC and outline some new directions which could become of primary importance at the LHC. |
hep-ph/0111289 | Daniele Fargion | Daniele Fargion | Upward and Horizontal Tau Airshowers by UHE Neutrinos | 5 pages, 3 figures, HEP2001 Conference, 13 July,Budapest. Particle
Astrophysics and Cosmology, 2001 | Proceedings of the EPS International Conference on High Energy
Physics, Budapest, 2001 (D. Horvath, P. Levai, A. Patkos,eds.), JHEP
PrHEP-hep2001/208 | null | null | hep-ph astro-ph quant-ph | null | Upward and Horizontal Tau Air-showers (UPTAUS and HORTAUS) emerging from the
Earth crust, mountain chains or deep plate boundaries are the most powerful
signals of Ultra High Energy UHE anti neutrinos electron at PeV and neutrino
and anti-neutrino tau at energies near and above 10^15-10^19 eV. The large tau
Air-showers multiplicity N in secondaries N_opt =10^12 E_tau/ PeV, N_gamma=
10^8 E_tau/PeV, N_{e^- e^+}= 2 10^7 E_tau/PeV, N_mu = 3 10^5 E_tau/PeV^{0.85},
make easy their discover. UHE nu_tau, nu_tau because neutrino flavor mixing,
nu_mu <--> nu_tau, should be as abundant as nu_mu, bar-nu_mu. Also bar{nu}_e,
near the Glashow W resonance peak, E_bar{nu_e}= M^2_W / 2m_e = 6.3 10^{15} eV,
may generate tau Air-showers. The HORTAUS may test the UHE neutrino
interactions leading to additional fine-tuned test of New TeV Physics in
Mountain Valleys and Earth crust horizontal edges. UPTAUS or HORTAUS, beaming
toward high mountains, air-planes, ballons and satellites should flash gamma,
muon, X and Cherenkov lights toward detectors. Such UPTAUS might already hit
nearby satellite GRO gamma detectors flashing it by short (millisecond), hard,
diluted gamma-burst at the edge of BATSE threshold. We claimed their identity
with the observed BATSE 78 Terrestrial Gamma Flashes (TGF). The TGF clustering
toward Galactic Center and Plane, known AGNs source strongly support their UHE
Tau neutrino origin.
| [
{
"created": "Thu, 22 Nov 2001 19:12:24 GMT",
"version": "v1"
},
{
"created": "Sun, 2 Dec 2001 15:40:42 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Fargion",
"Daniele",
""
]
] | Upward and Horizontal Tau Air-showers (UPTAUS and HORTAUS) emerging from the Earth crust, mountain chains or deep plate boundaries are the most powerful signals of Ultra High Energy UHE anti neutrinos electron at PeV and neutrino and anti-neutrino tau at energies near and above 10^15-10^19 eV. The large tau Air-showers multiplicity N in secondaries N_opt =10^12 E_tau/ PeV, N_gamma= 10^8 E_tau/PeV, N_{e^- e^+}= 2 10^7 E_tau/PeV, N_mu = 3 10^5 E_tau/PeV^{0.85}, make easy their discover. UHE nu_tau, nu_tau because neutrino flavor mixing, nu_mu <--> nu_tau, should be as abundant as nu_mu, bar-nu_mu. Also bar{nu}_e, near the Glashow W resonance peak, E_bar{nu_e}= M^2_W / 2m_e = 6.3 10^{15} eV, may generate tau Air-showers. The HORTAUS may test the UHE neutrino interactions leading to additional fine-tuned test of New TeV Physics in Mountain Valleys and Earth crust horizontal edges. UPTAUS or HORTAUS, beaming toward high mountains, air-planes, ballons and satellites should flash gamma, muon, X and Cherenkov lights toward detectors. Such UPTAUS might already hit nearby satellite GRO gamma detectors flashing it by short (millisecond), hard, diluted gamma-burst at the edge of BATSE threshold. We claimed their identity with the observed BATSE 78 Terrestrial Gamma Flashes (TGF). The TGF clustering toward Galactic Center and Plane, known AGNs source strongly support their UHE Tau neutrino origin. |
1902.03231 | Carlota Andres | Carlota Andres, N\'estor Armesto, Harri Niemi, Risto Paatelainen and
Carlos A. Salgado | Jet quenching as a probe of the initial stages in heavy-ion collisions | 10 pages, 7 figures. Version to be published in PLB. Minor changes in
the text and a new appendix containing 4 additional figures added | Phys. Lett. B 803 (2020) 135318 | 10.1016/j.physletb.2020.135318 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Jet quenching provides a very flexible variety of observables which are
sensitive to different energy- and time-scales of the strongly interacting
matter created in heavy-ion collisions. Exploiting this versatility would make
jet quenching an excellent chronometer of the yoctosecond structure of the
evolution process. Here we show, for the first time, that a combination of jet
quenching observables is sensitive to the initial stages of heavy-ion
collisions, when the approach to local thermal equilibrium is expected to
happen. Specifically, we find that in order to reproduce at the same time the
inclusive particle production suppression, $R_{AA}$, and the high-$p_T$
azimuthal asymmetries, $v_2$, energy loss must be strongly suppressed for the
first $\sim 0.6$ fm. This exploratory analysis shows the potential of jet
observables, possibly more sophisticated than the ones studied here, to
constrain the dynamics of the initial stages of the evolution.
| [
{
"created": "Fri, 8 Feb 2019 18:47:08 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Feb 2020 23:32:27 GMT",
"version": "v2"
}
] | 2020-03-02 | [
[
"Andres",
"Carlota",
""
],
[
"Armesto",
"Néstor",
""
],
[
"Niemi",
"Harri",
""
],
[
"Paatelainen",
"Risto",
""
],
[
"Salgado",
"Carlos A.",
""
]
] | Jet quenching provides a very flexible variety of observables which are sensitive to different energy- and time-scales of the strongly interacting matter created in heavy-ion collisions. Exploiting this versatility would make jet quenching an excellent chronometer of the yoctosecond structure of the evolution process. Here we show, for the first time, that a combination of jet quenching observables is sensitive to the initial stages of heavy-ion collisions, when the approach to local thermal equilibrium is expected to happen. Specifically, we find that in order to reproduce at the same time the inclusive particle production suppression, $R_{AA}$, and the high-$p_T$ azimuthal asymmetries, $v_2$, energy loss must be strongly suppressed for the first $\sim 0.6$ fm. This exploratory analysis shows the potential of jet observables, possibly more sophisticated than the ones studied here, to constrain the dynamics of the initial stages of the evolution. |
1810.05149 | Marc Montull | Christophe Grojean, Marc Montull, Marc Riembau | Diboson at the LHC vs LEP | 45 pages, 17 figures. v2: published version, expanded discussion on
UV models, additional plots to compare relative importance of WW and WZ
channels | null | 10.1007/JHEP03(2019)020 | DESY 17-231 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We use the current CMS and ATLAS data for the leptonic $pp \to WW, WZ$
channels to show that diboson production is, for a broad class of flavour
models, already competitive with LEP-1 measurements for setting bounds on the
dimension six operators parametrising the anomalous couplings between the
quarks and the electroweak gauge bosons, at least under the assumption that any
new particle is heavier than a few TeV. We also make an estimate of the HL-LHC
reach with $3$ ab$^{-1}$. We comment on possible BSM interpretations of the
bounds, and show the interplay with other searches for a simplified model with
vector triplets. We further study the effect of modified $Z$-quark-quark
couplings on the anomalous triple gauge coupling bounds. We find that their
impact is already significant and that it could modify the constraints on
$\delta g_{1z}$ and $\delta \kappa_\gamma$ by as much as a factor two at the
end of HL-LHC ($\lambda_\gamma$ is only marginally affected), requiring a
global fit to extract robust bounds. We stress the role of flavour assumptions
and study explicitly flavour universal and minimal flavour violation scenarios,
illustrating the differences with results obtained for universal theories.
| [
{
"created": "Thu, 11 Oct 2018 17:49:50 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Mar 2019 16:41:47 GMT",
"version": "v2"
}
] | 2019-03-27 | [
[
"Grojean",
"Christophe",
""
],
[
"Montull",
"Marc",
""
],
[
"Riembau",
"Marc",
""
]
] | We use the current CMS and ATLAS data for the leptonic $pp \to WW, WZ$ channels to show that diboson production is, for a broad class of flavour models, already competitive with LEP-1 measurements for setting bounds on the dimension six operators parametrising the anomalous couplings between the quarks and the electroweak gauge bosons, at least under the assumption that any new particle is heavier than a few TeV. We also make an estimate of the HL-LHC reach with $3$ ab$^{-1}$. We comment on possible BSM interpretations of the bounds, and show the interplay with other searches for a simplified model with vector triplets. We further study the effect of modified $Z$-quark-quark couplings on the anomalous triple gauge coupling bounds. We find that their impact is already significant and that it could modify the constraints on $\delta g_{1z}$ and $\delta \kappa_\gamma$ by as much as a factor two at the end of HL-LHC ($\lambda_\gamma$ is only marginally affected), requiring a global fit to extract robust bounds. We stress the role of flavour assumptions and study explicitly flavour universal and minimal flavour violation scenarios, illustrating the differences with results obtained for universal theories. |
2208.05064 | Ricardo S\'anchez-V\'elez | A. Bola\~nos-Carrera, R. S\'anchez-V\'elez and G. Tavares-Velasco | Rare decay $t\to c\gamma\gamma$ via scalar leptoquark doublets | In preparation for Journal Submission | null | 10.1103/PhysRevD.107.095018 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A calculation of the one-loop contribution to the rare three-body flavor
changing neutral current top quark decay $t\to c\gamma\gamma$ is presented in
the framework of models with one or more scalar leptoquark $SU(2)$ doublets
with hypercharge $7/6$. Analytical expressions for the invariant amplitude of
the generic decay $f_i\to f_j\gamma\gamma$, with $f_{i,j}$ a lepton or quark,
are presented in terms of Passarino-Veltman integral coefficients, from which
the amplitudes for the processes $t\to c\gamma\gamma$ and $\ell_i\to
\ell_j\gamma\gamma$ follow easily. An analysis of the current constraints on
the parameter space is presented in the scenario with only one scalar LQ
doublet and bounds on the LQ couplings are obtained from the muon $g-2$
anomaly, the lepton flavor violating (LFV) decay $\tau\to \mu\gamma$ and extra
constraints meant to avoid tension between theory predictions and experimental
data. For a LQ with a mass in the range of $1$--$1.5$ TeVs, the estimate ${\rm
Br}(t\to c\gamma\gamma)\sim 10^{-11}$--$10^{-12}$ is obtained for the largest
allowed values of the LQ coupling constants, which means that this decay would
be below the reach of future experimental measurements. We also consider an
scenario with three scalar doublets, which was recently proposed to explain the
lepton flavor universality violation anomalies in $B$ decays as well as the
muon $g-2$ anomaly. Although this scenario allows large LQ couplings to the tau
lepton and the $c$ and $t$ quarks, the branching ratio of the $t\to
c\gamma\gamma$ decay is also of the order of $10^{-11}$--$10^{-12}$ for LQ
masses of 1.7 TeV.
| [
{
"created": "Tue, 9 Aug 2022 22:40:58 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Dec 2022 19:17:37 GMT",
"version": "v2"
},
{
"created": "Tue, 4 Apr 2023 06:42:48 GMT",
"version": "v3"
}
] | 2023-05-24 | [
[
"Bolaños-Carrera",
"A.",
""
],
[
"Sánchez-Vélez",
"R.",
""
],
[
"Tavares-Velasco",
"G.",
""
]
] | A calculation of the one-loop contribution to the rare three-body flavor changing neutral current top quark decay $t\to c\gamma\gamma$ is presented in the framework of models with one or more scalar leptoquark $SU(2)$ doublets with hypercharge $7/6$. Analytical expressions for the invariant amplitude of the generic decay $f_i\to f_j\gamma\gamma$, with $f_{i,j}$ a lepton or quark, are presented in terms of Passarino-Veltman integral coefficients, from which the amplitudes for the processes $t\to c\gamma\gamma$ and $\ell_i\to \ell_j\gamma\gamma$ follow easily. An analysis of the current constraints on the parameter space is presented in the scenario with only one scalar LQ doublet and bounds on the LQ couplings are obtained from the muon $g-2$ anomaly, the lepton flavor violating (LFV) decay $\tau\to \mu\gamma$ and extra constraints meant to avoid tension between theory predictions and experimental data. For a LQ with a mass in the range of $1$--$1.5$ TeVs, the estimate ${\rm Br}(t\to c\gamma\gamma)\sim 10^{-11}$--$10^{-12}$ is obtained for the largest allowed values of the LQ coupling constants, which means that this decay would be below the reach of future experimental measurements. We also consider an scenario with three scalar doublets, which was recently proposed to explain the lepton flavor universality violation anomalies in $B$ decays as well as the muon $g-2$ anomaly. Although this scenario allows large LQ couplings to the tau lepton and the $c$ and $t$ quarks, the branching ratio of the $t\to c\gamma\gamma$ decay is also of the order of $10^{-11}$--$10^{-12}$ for LQ masses of 1.7 TeV. |
0911.4096 | Matti Jarvinen | Matti Jarvinen, Chris Kouvaris, Francesco Sannino | Gravitational Techniwaves | 30 pages, 5 figures. v2: minor changes, references added, title
changed in journal | Phys.Rev.D81:064027,2010 | 10.1103/PhysRevD.81.064027 | CP3-Origins-2009-24 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the production and possible detection of gravitational waves
stemming from the electroweak phase transition in the early universe in models
of minimal walking technicolor. In particular we discuss the two possible
scenarios in which one has only one electroweak phase transition and the case
in which the technicolor dynamics allows for multiple phase transitions.
| [
{
"created": "Fri, 20 Nov 2009 18:52:07 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Apr 2010 17:40:01 GMT",
"version": "v2"
}
] | 2010-04-14 | [
[
"Jarvinen",
"Matti",
""
],
[
"Kouvaris",
"Chris",
""
],
[
"Sannino",
"Francesco",
""
]
] | We investigate the production and possible detection of gravitational waves stemming from the electroweak phase transition in the early universe in models of minimal walking technicolor. In particular we discuss the two possible scenarios in which one has only one electroweak phase transition and the case in which the technicolor dynamics allows for multiple phase transitions. |
2303.09566 | Julian Heeck | Julian Heeck and Mikheil Sokhashvili | Revisiting the Friedberg-Lee-Sirlin soliton model | 9 pages, matches EPJC version | Eur. Phys. J. C 83, 526 (2023) | 10.1140/epjc/s10052-023-11710-9 | null | hep-ph hep-th nlin.SI | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non-topological solitons are localized classical field configurations
stabilized by a Noether charge. Friedberg, Lee, and Sirlin proposed a simple
renormalizable soliton model in their seminal 1976 paper, consisting of a
complex scalar field that carries the Noether charge and a real-scalar
mediator. We revisit this model, point out commonalities and differences with
Q-ball solitons, and provide analytic approximations to the underlying
differential equations.
| [
{
"created": "Thu, 16 Mar 2023 18:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Jun 2023 18:43:30 GMT",
"version": "v2"
}
] | 2023-06-26 | [
[
"Heeck",
"Julian",
""
],
[
"Sokhashvili",
"Mikheil",
""
]
] | Non-topological solitons are localized classical field configurations stabilized by a Noether charge. Friedberg, Lee, and Sirlin proposed a simple renormalizable soliton model in their seminal 1976 paper, consisting of a complex scalar field that carries the Noether charge and a real-scalar mediator. We revisit this model, point out commonalities and differences with Q-ball solitons, and provide analytic approximations to the underlying differential equations. |
1212.5427 | Antoni Szczurek | Antoni Szczurek and Rafal Maciula | Production of one and two $c \bar c$ pairs at LHC | 5 pages, 4 figures, invited talk by A. Szczurek at the international
workshop Diffraction2012, Puerto del Carmen, Lanzarote, Spain, September
10-15, 2012 | null | 10.1063/1.4802161 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on charm production at LHC. The production of single $c \bar c$
pairs is calculated in the $k_t$-factorization approach with different
unintegrated gluon distributions. Examples of transverse momentum distributions
for charmed mesons are presented and compared to recent experimental results
from LHC. Some missing strength is observed for most of UGDFs. Furthermore we
discuss production of two $c \bar c$ pairs within double-parton scattering
(DPS) and single-parton scattering (SPS) mechanisms. Surprisingly large cross
sections, comparable to single $c \bar c$ pair production are predicted. We
discuss first experimental results from LHCb collaboration on production of
pairs of $D$ mesons of the same flavour.
| [
{
"created": "Fri, 21 Dec 2012 13:37:39 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Szczurek",
"Antoni",
""
],
[
"Maciula",
"Rafal",
""
]
] | We report on charm production at LHC. The production of single $c \bar c$ pairs is calculated in the $k_t$-factorization approach with different unintegrated gluon distributions. Examples of transverse momentum distributions for charmed mesons are presented and compared to recent experimental results from LHC. Some missing strength is observed for most of UGDFs. Furthermore we discuss production of two $c \bar c$ pairs within double-parton scattering (DPS) and single-parton scattering (SPS) mechanisms. Surprisingly large cross sections, comparable to single $c \bar c$ pair production are predicted. We discuss first experimental results from LHCb collaboration on production of pairs of $D$ mesons of the same flavour. |
0911.4764 | Daniel Hern\'andez | D. Hernandez | Non-standard Neutrino Interactions | Proceedings of the 44th Rencontres de Moriond on Electroweak
Interactions and Unified Theories | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Theories beyond the Standard Model must respect its gauge symmetry. This
implies strict constraints on the possible models of Non-Standard Neutrino
Interactions (NSIs). We review here the present status of NSIs from the point
of view of effective field theory. Our recent work on the restrictions implied
by Standard Model gauge invariance is provided along with some examples of
possible gauge invariant models featuring non-standard interactions.
| [
{
"created": "Wed, 25 Nov 2009 05:25:59 GMT",
"version": "v1"
}
] | 2009-11-26 | [
[
"Hernandez",
"D.",
""
]
] | Theories beyond the Standard Model must respect its gauge symmetry. This implies strict constraints on the possible models of Non-Standard Neutrino Interactions (NSIs). We review here the present status of NSIs from the point of view of effective field theory. Our recent work on the restrictions implied by Standard Model gauge invariance is provided along with some examples of possible gauge invariant models featuring non-standard interactions. |
1208.4623 | Mariola Klusek-Gawenda | Mariola Klusek-Gawenda, Antoni Szczurek | Exclusive production of $\pi^+\pi^-$ and $\pi^0\pi^0$ pairs in
photon-photon and in ultrarelativistic heavy ion collisions | 4 pages, 7 figures, 1 table, talk by M. Klusek-Gawenda at MESON2012,
31 May - 5 June 2012, Krakow, Poland | null | 10.1051/epjconf/20123706006 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $\gamma\gamma\to\pi\pi$ reactions are discussed. To describe those
processes, we include dipion continuum, resonances, high-energy pion-pion
rescatterings, $\rho$ meson exchange and pQCD Brodsky-Lepage mechanisms. The
cross section for the production of pion pairs in photon-photon collisions in
peripheral heavy ion collisions is calculated with the help of Equivalent
Photon Approximaption (EPA) in the impact parameter space. We show predictions
at $\sqrt{s_{NN}}=3.5$ TeV which could be measured e.g. by the ALICE
collaboration at the LHC.
| [
{
"created": "Wed, 22 Aug 2012 20:53:58 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Klusek-Gawenda",
"Mariola",
""
],
[
"Szczurek",
"Antoni",
""
]
] | The $\gamma\gamma\to\pi\pi$ reactions are discussed. To describe those processes, we include dipion continuum, resonances, high-energy pion-pion rescatterings, $\rho$ meson exchange and pQCD Brodsky-Lepage mechanisms. The cross section for the production of pion pairs in photon-photon collisions in peripheral heavy ion collisions is calculated with the help of Equivalent Photon Approximaption (EPA) in the impact parameter space. We show predictions at $\sqrt{s_{NN}}=3.5$ TeV which could be measured e.g. by the ALICE collaboration at the LHC. |
1606.05163 | Ivica Picek | Oleg Antipin, Petar Culjak, Kresimir Kumericki and Ivica Picek | Radiative neutrino models in light of diphoton signals | 23 pages, 5 figures, new section and refs added; to stay unpublished
since diphoton signal disappeared | null | null | ZTF-EP-16-02 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Viable explanations of a hinted 750 GeV scalar resonance may be sought within
the extensions of the SM Higgs sector aimed at generating neutrino masses at
the loop level. We confront a compatibility with the 750 GeV diphoton excess
for two recent models which do not need to impose ad hoc symmetry to forbid the
tree-level masses: a one-loop mass model providing the H(750) candidate within
its real triplet scalar representation and a three-loop mass model providing it
within its two Higgs doublets. Besides accounting for the 750 GeV resonance, we
demonstrate that these complementary neutrino-mass scenarios have different
testable predictions for the LHC which should show up soon as more data is
accumulated during the ongoing 13 TeV run.
| [
{
"created": "Thu, 16 Jun 2016 12:45:00 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jan 2017 12:40:15 GMT",
"version": "v2"
}
] | 2017-01-26 | [
[
"Antipin",
"Oleg",
""
],
[
"Culjak",
"Petar",
""
],
[
"Kumericki",
"Kresimir",
""
],
[
"Picek",
"Ivica",
""
]
] | Viable explanations of a hinted 750 GeV scalar resonance may be sought within the extensions of the SM Higgs sector aimed at generating neutrino masses at the loop level. We confront a compatibility with the 750 GeV diphoton excess for two recent models which do not need to impose ad hoc symmetry to forbid the tree-level masses: a one-loop mass model providing the H(750) candidate within its real triplet scalar representation and a three-loop mass model providing it within its two Higgs doublets. Besides accounting for the 750 GeV resonance, we demonstrate that these complementary neutrino-mass scenarios have different testable predictions for the LHC which should show up soon as more data is accumulated during the ongoing 13 TeV run. |
1309.5412 | Jeronimo Peralta Ramos | E. Calzetta, J. Peralta-Ramos | A hydrodynamic approach to QGP instabilities | 11 pages, no figures. v2: minor changes, added references. Accepted
in Phys. Rev. D | null | 10.1103/PhysRevD.88.095010 | null | hep-ph physics.plasm-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the usual linear analysis of QGP Weibel instabilities based on
the Maxwell-Boltzmann equation may be reproduced in a purely hydrodynamic
model. The latter is derived by the Entropy Production Variational Method from
a transport equation including collisions, and can describe highly
nonequilibrium flow. We find that, as expected, collisions slow down the growth
of Weibel instabilities. Finally, we discuss the strong momentum anisotropy
limit.
| [
{
"created": "Fri, 20 Sep 2013 23:28:57 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Nov 2013 20:59:26 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Calzetta",
"E.",
""
],
[
"Peralta-Ramos",
"J.",
""
]
] | We show that the usual linear analysis of QGP Weibel instabilities based on the Maxwell-Boltzmann equation may be reproduced in a purely hydrodynamic model. The latter is derived by the Entropy Production Variational Method from a transport equation including collisions, and can describe highly nonequilibrium flow. We find that, as expected, collisions slow down the growth of Weibel instabilities. Finally, we discuss the strong momentum anisotropy limit. |
hep-ph/9903418 | Sourov Roy | Biswarup Mukhopadhyaya and Sourov Roy | Radiative decay of the lightest neutralino in an R-parity violating
supersymmetric theory | 25 pages, LaTex including postscript figures. Uses axodraw.sty. Minor
typographic errors corrected | Phys.Rev. D60 (1999) 115012 | 10.1103/PhysRevD.60.115012 | MRI-PHY/P990307 | hep-ph | null | In an R-parity violating supersymmetric scenario, the lightest neutralino
$\tilde \chi^0_1$ is no longer a stable particle. We calculate the branching
ratio for the decay mode $\tilde \chi^0_1 \longrightarrow \nu \gamma$ which
occurs at the one-loop level. Taking into account bilinear as well as trilinear
lepton number violating interactions as the sources of R-parity violation, we
make a detailed scan of the parameter space, both with and without gaugino mass
unification and including the constraints on the neutrino sector from the
recent Superkamiokande results. This study enables one to suggest interesting
experimental signals distinguishing between the two types of R-parity breaking,
and also to ascertain whether such radiative decays can give rise to collider
signals of the type $\gamma \gamma$ + $\not {\rm E}$ from pair-produced
neutralinos.
| [
{
"created": "Sat, 20 Mar 1999 12:29:34 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Aug 1999 00:46:35 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Mukhopadhyaya",
"Biswarup",
""
],
[
"Roy",
"Sourov",
""
]
] | In an R-parity violating supersymmetric scenario, the lightest neutralino $\tilde \chi^0_1$ is no longer a stable particle. We calculate the branching ratio for the decay mode $\tilde \chi^0_1 \longrightarrow \nu \gamma$ which occurs at the one-loop level. Taking into account bilinear as well as trilinear lepton number violating interactions as the sources of R-parity violation, we make a detailed scan of the parameter space, both with and without gaugino mass unification and including the constraints on the neutrino sector from the recent Superkamiokande results. This study enables one to suggest interesting experimental signals distinguishing between the two types of R-parity breaking, and also to ascertain whether such radiative decays can give rise to collider signals of the type $\gamma \gamma$ + $\not {\rm E}$ from pair-produced neutralinos. |
1201.0149 | Ju-Jun Xie | Ju-Jun Xie and E. Oset | The $DN$, $\pi \Sigma_c$ interaction in finite volume and the
$\Lambda_c(2595)$ resonance | 10 pages, 13 figures, accepted for publication in Eur. Phys. J. A | null | 10.1140/epja/i2012-12146-x | null | hep-ph hep-ex hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work the interaction of the coupled channels $DN$ and $\pi \Sigma_c$
in an SU(4) extrapolation of the chiral unitary theory, where the
$\Lambda_c(2595)$ resonance appears as dynamically generated from that
interaction, is extended to produce results in finite volume. Energy levels in
the finite box are evaluated and, assuming that they would correspond to
lattice results, the inverse problem of determining the phase shifts in the
infinite volume from the lattice results is solved. We observe that it is
possible to obtain accurate $\pi \Sigma_c$ phase shifts and the position of the
$\Lambda_c(2595)$ resonance, but it requires the explicit consideration of the
two coupled channels. We also observe that some of the energy levels in the box
are attached to the closed $DN$ channel, such that their use to induce the $\pi
\Sigma_c$ phase shifts via L\"uscher's formula leads to incorrect results.
| [
{
"created": "Fri, 30 Dec 2011 16:19:19 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Sep 2012 08:21:56 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Xie",
"Ju-Jun",
""
],
[
"Oset",
"E.",
""
]
] | In this work the interaction of the coupled channels $DN$ and $\pi \Sigma_c$ in an SU(4) extrapolation of the chiral unitary theory, where the $\Lambda_c(2595)$ resonance appears as dynamically generated from that interaction, is extended to produce results in finite volume. Energy levels in the finite box are evaluated and, assuming that they would correspond to lattice results, the inverse problem of determining the phase shifts in the infinite volume from the lattice results is solved. We observe that it is possible to obtain accurate $\pi \Sigma_c$ phase shifts and the position of the $\Lambda_c(2595)$ resonance, but it requires the explicit consideration of the two coupled channels. We also observe that some of the energy levels in the box are attached to the closed $DN$ channel, such that their use to induce the $\pi \Sigma_c$ phase shifts via L\"uscher's formula leads to incorrect results. |
2401.07289 | Yan Wang | Yan Ma, A. Arhrib, S. Moretti, S. Semlali, Y. Wang, Q.S. Yan | Analysis of the $gg\to H\to hh\to4\tau$ process in the 2HDM lepton
specific model at the LHC | 19 pages, 7 figures, 7 tables. arXiv admin note: text overlap with
arXiv:2305.05788 | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We analyse the signature of a light Higgs boson pair in the 2-Higgs Doublet
Model(2HDM) Type-X (or lepton specific) over the parameter spaces allowed by
theoretical self-consistency requirements as well as the latest experimental
constraints from the Large Hadron Collider (LHC), precision test data and $B$
physics. Over the viable regions of the latter, wherein the Standard Model
(SM)-like Higgs boson discovered at the LHC in 2012 is the heavier CP-even
state of the 2HDM, $H$, it is found that the SM-like Higgs boson can decay into
a pair of the lighter CP-even Higgs boson, $h$, via the process $H\to hh$ with
a Branching Ratio (BR) of $5\%-10\%$ or so, (with $2 m_h < m_H =125$ GeV).
Furthermore, in the Type-X scenario, the lighter Higgs bosons $h$ can
dominantly decay into two $\tau$'s due to a large $\tan\beta$. Therefore, the
pair of lighter Higgs bosons can altogether decay into a 4 $\tau$ final state.
In order to suppress the huge SM background events, we confine ourself to
consider the fraction of signal events with two Same-Sign (SS) $\tau$'s further
decaying into same sign leptons while the other two $\tau$'s decay
hadronically. By using Monte Carlo (MC) and Machine Learning (ML) tools, we
thus focus on the analysis of the signal process $pp\to H\to hh\to
\tau^{+}\tau^{-}\tau^{+}\tau^{-}\to \ell v_\ell \ell v_\ell \tau_h \tau_h$
(where $\ell= e, \mu$ and $\tau_h$ means a hadronic decay of the $\tau$) and
explore the feasibility of such a search at the LHC for a collision energy
$\sqrt{s}=~\text{14 TeV}$ and a luminosity $\text{300}~\text{fb}^{-1}$
| [
{
"created": "Sun, 14 Jan 2024 13:46:24 GMT",
"version": "v1"
}
] | 2024-01-17 | [
[
"Ma",
"Yan",
""
],
[
"Arhrib",
"A.",
""
],
[
"Moretti",
"S.",
""
],
[
"Semlali",
"S.",
""
],
[
"Wang",
"Y.",
""
],
[
"Yan",
"Q. S.",
""
]
] | We analyse the signature of a light Higgs boson pair in the 2-Higgs Doublet Model(2HDM) Type-X (or lepton specific) over the parameter spaces allowed by theoretical self-consistency requirements as well as the latest experimental constraints from the Large Hadron Collider (LHC), precision test data and $B$ physics. Over the viable regions of the latter, wherein the Standard Model (SM)-like Higgs boson discovered at the LHC in 2012 is the heavier CP-even state of the 2HDM, $H$, it is found that the SM-like Higgs boson can decay into a pair of the lighter CP-even Higgs boson, $h$, via the process $H\to hh$ with a Branching Ratio (BR) of $5\%-10\%$ or so, (with $2 m_h < m_H =125$ GeV). Furthermore, in the Type-X scenario, the lighter Higgs bosons $h$ can dominantly decay into two $\tau$'s due to a large $\tan\beta$. Therefore, the pair of lighter Higgs bosons can altogether decay into a 4 $\tau$ final state. In order to suppress the huge SM background events, we confine ourself to consider the fraction of signal events with two Same-Sign (SS) $\tau$'s further decaying into same sign leptons while the other two $\tau$'s decay hadronically. By using Monte Carlo (MC) and Machine Learning (ML) tools, we thus focus on the analysis of the signal process $pp\to H\to hh\to \tau^{+}\tau^{-}\tau^{+}\tau^{-}\to \ell v_\ell \ell v_\ell \tau_h \tau_h$ (where $\ell= e, \mu$ and $\tau_h$ means a hadronic decay of the $\tau$) and explore the feasibility of such a search at the LHC for a collision energy $\sqrt{s}=~\text{14 TeV}$ and a luminosity $\text{300}~\text{fb}^{-1}$ |
hep-ph/0302202 | Jonathan Sapirstein | J. Sapirstein, K. Pachucki, A. Veitia, and K.T. Cheng | Radiative Corrections to Parity Nonconserving Transitions in Atoms | 20 pages, 4 figures | null | 10.1103/PhysRevA.67.052110 | null | hep-ph | null | The matrix element of a bound electron interacting with the nucleus through
exchange of a Z boson is studied for the gauge invariant case of
$2s_{1/2}-2p_{1/2}$ transitions in hydrogenic ions. The QED radiative
correction to the matrix element, which is $-\alpha/2\pi$ in lowest order, is
calculated to all orders in $Z\alpha$ using exact propagators. Previous
calculation of the first-order binding correction are confirmed both
analytically and by fitting the exact function at low $Z$. Consequences for the
interpretation of parity nonconservation in cesium are discussed.
| [
{
"created": "Sat, 22 Feb 2003 14:23:05 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Sapirstein",
"J.",
""
],
[
"Pachucki",
"K.",
""
],
[
"Veitia",
"A.",
""
],
[
"Cheng",
"K. T.",
""
]
] | The matrix element of a bound electron interacting with the nucleus through exchange of a Z boson is studied for the gauge invariant case of $2s_{1/2}-2p_{1/2}$ transitions in hydrogenic ions. The QED radiative correction to the matrix element, which is $-\alpha/2\pi$ in lowest order, is calculated to all orders in $Z\alpha$ using exact propagators. Previous calculation of the first-order binding correction are confirmed both analytically and by fitting the exact function at low $Z$. Consequences for the interpretation of parity nonconservation in cesium are discussed. |
2106.15522 | Nikolaos Stefanis | S. V. Mikhailov and N. G. Stefanis | Cross-link relations between $\pi$ and $\rho$-meson channels and the QCD
vacuum | 9 pages, 1 table, 4 figures. V2 matches published version | Phys. Rev. D 104, 096103 (2021) | 10.1103/PhysRevD.104.096013 | RUB-TPII-02/2021 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss cross-link relations between the $\pi$ and $\rho$-meson channels
emerging from two different descriptions of the QCD vacuum: Instanton physics
and QCD sum rules with nonlocal condensates (NLC). We derive in both schemes an
intriguing linear relation between the $\pi$ and the $\rho^\|$-meson
distribution amplitudes in terms of their conformal coefficients and work out
the specific impact of the scalar NLC in these two channels. Using a simple
model with Gaussian decay of the scalar NLC, we are able to relate it to the
moments of the pion non-singlet parton distribution function measurable in
experiment -- a highly nontrivial result. The implications for the pion and the
$\rho^\|$-meson DAs entailed by the obtained cross-link relations are outlined
in terms of two generic scenarios.
| [
{
"created": "Tue, 29 Jun 2021 15:50:09 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Nov 2021 14:25:42 GMT",
"version": "v2"
}
] | 2021-11-23 | [
[
"Mikhailov",
"S. V.",
""
],
[
"Stefanis",
"N. G.",
""
]
] | We discuss cross-link relations between the $\pi$ and $\rho$-meson channels emerging from two different descriptions of the QCD vacuum: Instanton physics and QCD sum rules with nonlocal condensates (NLC). We derive in both schemes an intriguing linear relation between the $\pi$ and the $\rho^\|$-meson distribution amplitudes in terms of their conformal coefficients and work out the specific impact of the scalar NLC in these two channels. Using a simple model with Gaussian decay of the scalar NLC, we are able to relate it to the moments of the pion non-singlet parton distribution function measurable in experiment -- a highly nontrivial result. The implications for the pion and the $\rho^\|$-meson DAs entailed by the obtained cross-link relations are outlined in terms of two generic scenarios. |
1301.5970 | Gulsheen Ahuja | Priyanka Fakay, Samandeep Sharma, Rohit Verma, Gulsheen Ahuja and
Manmohan Gupta | Implications of theta_13 on Fritzsch-like lepton mass matrices | 18 pages, 8 figures. arXiv admin note: substantial text overlap with
arXiv:hep-ph/0607074, arXiv:hep-ph/0703005, arXiv:0904.4534 | Physics Letters B 720 (2013) 366 | 10.1016/j.physletb.2013.02.044 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Implications of the lepton mixing angles, in particular of theta_13, have
been investigated for minimal as well as non-minimal Fritzsch-like textures for
the case of Majorana neutrinos. Both, in minimal texture (texture 6 zero lepton
mass matrices) and non-minimal textures (two cases of texture 5 zero lepton
mass matrices), inverted hierarchy and degenerate scenario of neutrino masses
have been ruled out. The implications of theta_13 have been investigated on the
lightest neutrino mass m_\nu_1 as well as the effective Majorana mass m_ee.
| [
{
"created": "Fri, 25 Jan 2013 06:48:04 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Fakay",
"Priyanka",
""
],
[
"Sharma",
"Samandeep",
""
],
[
"Verma",
"Rohit",
""
],
[
"Ahuja",
"Gulsheen",
""
],
[
"Gupta",
"Manmohan",
""
]
] | Implications of the lepton mixing angles, in particular of theta_13, have been investigated for minimal as well as non-minimal Fritzsch-like textures for the case of Majorana neutrinos. Both, in minimal texture (texture 6 zero lepton mass matrices) and non-minimal textures (two cases of texture 5 zero lepton mass matrices), inverted hierarchy and degenerate scenario of neutrino masses have been ruled out. The implications of theta_13 have been investigated on the lightest neutrino mass m_\nu_1 as well as the effective Majorana mass m_ee. |
1912.12839 | Priyanka Lamba | Emilian Dudas, Priyanka Lamba, Sudhir K. Vempati | Diluting SUSY flavour problem on the Landscape | 18 pages, 8 figures | null | 10.1016/j.physletb.2020.135404 | CPHT-RR108.122019 | hep-ph | http://creativecommons.org/publicdomain/zero/1.0/ | We consider an explicit effective field theory example based on the
Bousso-Polchinski framework with a large number N of hidden sectors
contributing to supersymmetry breaking. Each contribution comes from four form
quantized fluxes, multiplied by random couplings. The soft terms in the
observable sector in this case become random variables, with mean values and
standard deviations which are computable. We show that this setup naturally
leads to a solution of the flavor problem in low-energy supersymmetry if N is
sufficiently large. We investigate the consequences for flavor violating
processes at low-energy and for dark matter.
| [
{
"created": "Mon, 30 Dec 2019 07:55:37 GMT",
"version": "v1"
}
] | 2020-04-08 | [
[
"Dudas",
"Emilian",
""
],
[
"Lamba",
"Priyanka",
""
],
[
"Vempati",
"Sudhir K.",
""
]
] | We consider an explicit effective field theory example based on the Bousso-Polchinski framework with a large number N of hidden sectors contributing to supersymmetry breaking. Each contribution comes from four form quantized fluxes, multiplied by random couplings. The soft terms in the observable sector in this case become random variables, with mean values and standard deviations which are computable. We show that this setup naturally leads to a solution of the flavor problem in low-energy supersymmetry if N is sufficiently large. We investigate the consequences for flavor violating processes at low-energy and for dark matter. |
hep-ph/9511381 | Kazuya Kumekawa | H.Fujisaki, K.Kumekawa, M.Yamaguchi, M.Yoshimura | Particle Production and Gravitino Abundance after Inflation | 23 pages + 13 figures | Phys.Rev.D54:2494-2503,1996 | 10.1103/PhysRevD.54.2494 | TU/95/493, TUM-HEP-229/95, SFB-375/24 | hep-ph astro-ph | null | Thermal history after inflation is studied in a chaotic inflation model with
supersymmetric couplings of the inflaton to matter fields. Time evolution
equation is solved in a formalism that incorporates both the back reaction of
particle production and the cosmological expansion. The effect of the
parametric resonance gives rise to a rapid initial phase of the inflaton decay
followed by a slow stage of the Born term decay. Thermalization takes place
immediately after the first explosive stage for a medium strength of the
coupling among created particles. As an application we calculate time evolution
of the gravitino abundance that is produced by ordinary particles directly
created from the inflaton decay, which typically results in much more enhanced
yield than what a naive estimate based on the Born term would suggest.
| [
{
"created": "Tue, 21 Nov 1995 09:27:33 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Fujisaki",
"H.",
""
],
[
"Kumekawa",
"K.",
""
],
[
"Yamaguchi",
"M.",
""
],
[
"Yoshimura",
"M.",
""
]
] | Thermal history after inflation is studied in a chaotic inflation model with supersymmetric couplings of the inflaton to matter fields. Time evolution equation is solved in a formalism that incorporates both the back reaction of particle production and the cosmological expansion. The effect of the parametric resonance gives rise to a rapid initial phase of the inflaton decay followed by a slow stage of the Born term decay. Thermalization takes place immediately after the first explosive stage for a medium strength of the coupling among created particles. As an application we calculate time evolution of the gravitino abundance that is produced by ordinary particles directly created from the inflaton decay, which typically results in much more enhanced yield than what a naive estimate based on the Born term would suggest. |
1810.05675 | Peter Stoffer | Wouter Dekens, Elizabeth E. Jenkins, Aneesh V. Manohar, Peter Stoffer | Non-Perturbative Effects in $\mu \to e \gamma$ | 21 pages, 1 figure; version published in JHEP | JHEP 1901 (2019) 088 | 10.1007/JHEP01(2019)088 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the non-perturbative contribution of semileptonic tensor operators
$(\bar q \sigma^{\mu \nu} q)(\bar \ell \sigma_{\mu \nu} \ell)$ to the purely
leptonic process $\mu \to e \gamma$ and to the electric and magnetic dipole
moments of charged leptons by matching onto chiral perturbation theory at low
energies. This matching procedure has been used extensively to study
semileptonic and leptonic weak decays of hadrons. In this paper, we apply it to
observables that contain no strongly interacting external particles. The
non-perturbative contribution to $\mu \to e $ processes is used to extract the
best current bound on lepton-flavor-violating semileptonic tensor operators,
$\Lambda_\text{BSM} \gtrsim 450$ TeV. We briefly discuss how the same method
applies to dark-matter interactions.
| [
{
"created": "Fri, 12 Oct 2018 18:46:16 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Jan 2019 19:50:12 GMT",
"version": "v2"
}
] | 2019-01-28 | [
[
"Dekens",
"Wouter",
""
],
[
"Jenkins",
"Elizabeth E.",
""
],
[
"Manohar",
"Aneesh V.",
""
],
[
"Stoffer",
"Peter",
""
]
] | We compute the non-perturbative contribution of semileptonic tensor operators $(\bar q \sigma^{\mu \nu} q)(\bar \ell \sigma_{\mu \nu} \ell)$ to the purely leptonic process $\mu \to e \gamma$ and to the electric and magnetic dipole moments of charged leptons by matching onto chiral perturbation theory at low energies. This matching procedure has been used extensively to study semileptonic and leptonic weak decays of hadrons. In this paper, we apply it to observables that contain no strongly interacting external particles. The non-perturbative contribution to $\mu \to e $ processes is used to extract the best current bound on lepton-flavor-violating semileptonic tensor operators, $\Lambda_\text{BSM} \gtrsim 450$ TeV. We briefly discuss how the same method applies to dark-matter interactions. |
1707.08067 | George Leontaris | Thomas W. Kephart, George K. Leontaris, Qaisar Shafi | Magnetic Monopoles and Free Fractionally Charged States at Accelerators
and in Cosmic Rays | 18 pages, 2 figures, minor revisions, references added | null | 10.1007/JHEP10(2017)176 | null | hep-ph hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Unified theories of strong, weak and electromagnetic interactions which have
electric charge quantization predict the existence of topologically stable
magnetic monopoles. Intermediate scale monopoles are comparable with detection
energies of cosmic ray monopoles at IceCube and other cosmic ray experiments.
Magnetic monopoles in some models can be significantly lighter and carry two,
three or possibly even higher quanta of the Dirac magnetic charge. They could
be light enough for their effects to be detected at the LHC either directly or
indirectly. An example based on a D-brane inspired $SU(3)_C\times SU(3)_L\times
SU(3)_R$ (trinification) model with the monopole carrying three quanta of Dirac
magnetic charge is presented. These theories also predict the existence of
color singlet states with fractional electric charge which may be accessible at
the LHC.
| [
{
"created": "Tue, 25 Jul 2017 16:16:36 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Sep 2017 00:52:17 GMT",
"version": "v2"
}
] | 2017-12-06 | [
[
"Kephart",
"Thomas W.",
""
],
[
"Leontaris",
"George K.",
""
],
[
"Shafi",
"Qaisar",
""
]
] | Unified theories of strong, weak and electromagnetic interactions which have electric charge quantization predict the existence of topologically stable magnetic monopoles. Intermediate scale monopoles are comparable with detection energies of cosmic ray monopoles at IceCube and other cosmic ray experiments. Magnetic monopoles in some models can be significantly lighter and carry two, three or possibly even higher quanta of the Dirac magnetic charge. They could be light enough for their effects to be detected at the LHC either directly or indirectly. An example based on a D-brane inspired $SU(3)_C\times SU(3)_L\times SU(3)_R$ (trinification) model with the monopole carrying three quanta of Dirac magnetic charge is presented. These theories also predict the existence of color singlet states with fractional electric charge which may be accessible at the LHC. |
1308.2679 | Anthony DiFranzo | Anthony DiFranzo, Keiko I. Nagao, Arvind Rajaraman, Tim M.P. Tait | Simplified Models for Dark Matter Interacting with Quarks | 12 pages, 13 figures (39 images) Fixed erroneous calculation and
updated plots | JHEP 1311 (2013) 014 | 10.1007/JHEP11(2013)014 | UCI-HEP-TR-2013-17, KEK-TH 1659 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate simplified models in which dark matter particles, taken to be
either Dirac or Majorana fermions, couple to quarks via colored mediators. We
determine bounds from colliders and direct detection experiments, and show how
the interplay of the two leads to a complementary view of this class of dark
matter models. Forecasts for future searches in light of the current
constraints are presented.
| [
{
"created": "Mon, 12 Aug 2013 20:00:11 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Dec 2013 22:23:09 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"DiFranzo",
"Anthony",
""
],
[
"Nagao",
"Keiko I.",
""
],
[
"Rajaraman",
"Arvind",
""
],
[
"Tait",
"Tim M. P.",
""
]
] | We investigate simplified models in which dark matter particles, taken to be either Dirac or Majorana fermions, couple to quarks via colored mediators. We determine bounds from colliders and direct detection experiments, and show how the interplay of the two leads to a complementary view of this class of dark matter models. Forecasts for future searches in light of the current constraints are presented. |
hep-ph/0207245 | Adam K. Leibovich | Adam K. Leibovich | Radiative Upsilon Decay at the Endpoint | Talk at 5th International Conference on Hyperons, Charm and Beauty
Hadrons (BEACH 2002), Vancouver, Canada, 25-29 Jun 2002 | Nucl.Phys.Proc.Suppl. 115 (2003) 183-186 | 10.1016/S0920-5632(02)01987-4 | FERMILAB-CONF-02/160-T | hep-ph | null | The standard NRQCD power counting breaks down and the OPE gives rise to
color-octet shape functions at the upper endpoint of the photon energy spectrum
in radiative Upsilon decay. Also in this kinematic regime, large Sudakov
logarithms appear in the octet Wilson coefficients, ruining the perturbative
expansion. Using SCET, the octet shape functions arise naturally and the
Sudakov logarithms can be summed using the renormalization group equations. We
derive an expression for the resummed octet energy spectrum.
| [
{
"created": "Fri, 19 Jul 2002 19:10:46 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Leibovich",
"Adam K.",
""
]
] | The standard NRQCD power counting breaks down and the OPE gives rise to color-octet shape functions at the upper endpoint of the photon energy spectrum in radiative Upsilon decay. Also in this kinematic regime, large Sudakov logarithms appear in the octet Wilson coefficients, ruining the perturbative expansion. Using SCET, the octet shape functions arise naturally and the Sudakov logarithms can be summed using the renormalization group equations. We derive an expression for the resummed octet energy spectrum. |
2307.08734 | Kaapo Sepp\"anen | Tyler Gorda, Risto Paatelainen, Saga S\"appi, Kaapo Sepp\"anen | Equation of State of Cold Quark Matter to $O(\alpha_s^3 \ln \alpha_s)$ | Corresponds to the published version. 7 pages (main text), 6 pages
(supplemental material), 2 figures, 2 tables | Phys.Rev.Lett. 131, 181902 (2023) | 10.1103/PhysRevLett.131.181902 | HIP-2023-10/TH, TUM-EFT 181/23 | hep-ph astro-ph.HE nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Accurately understanding the equation of state (EOS) of high-density,
zero-temperature quark matter plays an essential role in constraining the
behavior of dense strongly interacting matter inside the cores of neutron
stars. In this Letter, we study the weak-coupling expansion of the EOS of cold
quark matter and derive the complete, gauge-invariant contributions from the
long-wavelength, dynamically screened gluonic sector at
next-to-next-to-next-to-leading order (N3LO) in the strong coupling constant
$\alpha_s$. This elevates the EOS result to the $O(\alpha_s^3 \ln \alpha_s)$
level, leaving only one unknown constant from the unscreened sector at N3LO,
and places it on par with its high-temperature counterpart from 2003.
| [
{
"created": "Mon, 17 Jul 2023 18:00:01 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Nov 2023 11:13:32 GMT",
"version": "v2"
}
] | 2023-11-14 | [
[
"Gorda",
"Tyler",
""
],
[
"Paatelainen",
"Risto",
""
],
[
"Säppi",
"Saga",
""
],
[
"Seppänen",
"Kaapo",
""
]
] | Accurately understanding the equation of state (EOS) of high-density, zero-temperature quark matter plays an essential role in constraining the behavior of dense strongly interacting matter inside the cores of neutron stars. In this Letter, we study the weak-coupling expansion of the EOS of cold quark matter and derive the complete, gauge-invariant contributions from the long-wavelength, dynamically screened gluonic sector at next-to-next-to-next-to-leading order (N3LO) in the strong coupling constant $\alpha_s$. This elevates the EOS result to the $O(\alpha_s^3 \ln \alpha_s)$ level, leaving only one unknown constant from the unscreened sector at N3LO, and places it on par with its high-temperature counterpart from 2003. |
1903.11489 | Adil Jueid | Abdesslam Arhrib, Adil Jueid, Stefano Moretti | Searching for Heavy Charged Higgs Bosons through Top Quark Polarization | 7 pages; 2 Figures; 2 Tables; To appear for IAS Program on HEP,
January 2019, Hong Kong, based on arXiv:1807.11306 | null | 10.1142/S0217751X20410110 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the production of a heavy charged Higgs boson at the Large Hadron
Collider (LHC) in $gb\to H^{-} t$ within a Two Higgs Doublet Model (2HDM). The
chiral structure of the $H^{-} t \bar{b}$ coupling can trigger a particular
spin state of the top quark produced in the decay of a charged Higgs boson and,
therefore, is sensitive to the underlying mechanism of the Electro-Weak
Symmetry Breaking (EWSB). Taking two benchmark models (2HDM type-I and 2HDM
type-Y) as an example, we show that inclusive rates, differential distributions
as well as forward-backward asymmetries of the top quark's decay products can
be used to search for heavy charged Higgs bosons as well as a model
discriminators.
| [
{
"created": "Wed, 27 Mar 2019 15:29:28 GMT",
"version": "v1"
}
] | 2020-07-15 | [
[
"Arhrib",
"Abdesslam",
""
],
[
"Jueid",
"Adil",
""
],
[
"Moretti",
"Stefano",
""
]
] | We study the production of a heavy charged Higgs boson at the Large Hadron Collider (LHC) in $gb\to H^{-} t$ within a Two Higgs Doublet Model (2HDM). The chiral structure of the $H^{-} t \bar{b}$ coupling can trigger a particular spin state of the top quark produced in the decay of a charged Higgs boson and, therefore, is sensitive to the underlying mechanism of the Electro-Weak Symmetry Breaking (EWSB). Taking two benchmark models (2HDM type-I and 2HDM type-Y) as an example, we show that inclusive rates, differential distributions as well as forward-backward asymmetries of the top quark's decay products can be used to search for heavy charged Higgs bosons as well as a model discriminators. |
2204.05197 | Egle Tomasi-Gustafsson | Andrea Bianconi, Egle Tomasi-Gustafsson | Compared analysis of time-like hyperon form factors | 20 pages, 10 figures | null | 10.1103/PhysRevC.105.065206 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Data on hyperon form factors recently obtained from annihilation reactions
are compared each other, and to proton and neutron form factors, in terms of
two kinematical variables: the transferred momentum square, $q^2$, and the
modulus $P$ of the relative momentum between the outgoing baryons. They are
critically discussed in terms of possible correlated structures. The present
status of the time-like form factor data for baryons is described and
suggestions are given on the reactions and the kinematical range where data are
desirable in order to clarify the arisen questions.
| [
{
"created": "Mon, 11 Apr 2022 15:36:23 GMT",
"version": "v1"
}
] | 2022-07-13 | [
[
"Bianconi",
"Andrea",
""
],
[
"Tomasi-Gustafsson",
"Egle",
""
]
] | Data on hyperon form factors recently obtained from annihilation reactions are compared each other, and to proton and neutron form factors, in terms of two kinematical variables: the transferred momentum square, $q^2$, and the modulus $P$ of the relative momentum between the outgoing baryons. They are critically discussed in terms of possible correlated structures. The present status of the time-like form factor data for baryons is described and suggestions are given on the reactions and the kinematical range where data are desirable in order to clarify the arisen questions. |
2110.12451 | Neetu Raj Singh Chundawat | Ashutosh Kumar Alok, Neetu Raj Singh Chundawat, Dinesh Kumar | Impact of $b \to s \ell \ell$ anomalies on rare charm decays in
non-universal $Z'$ models | 23 pages, 3 figures; Published version | Eur. Phys. J. C 82, 30 (2022) | 10.1140/epjc/s10052-021-09975-z | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we study the impact of $b \to s \ell \ell$, $B_s - \bar{B_s}$
mixing and neutrino trident measurements on observables in decays induced by $c
\to u $ transition in the context of a non-universal $Z'$ model which generates
$C^{\rm NP}_{9} <0$ and $C^{\rm NP}_9 = - \,C^{\rm NP}_{10} $ new physics
scenarios at the tree level. We inspect the effects on $D^0 \to \pi^0 \nu
\bar{\nu}$, $D^+ \to \pi^+ \nu \bar{\nu}$ and $B_c \to B^+ \nu \bar{\nu} $
decays which are induced by the quark level transition $c \to u \nu \bar{\nu}$.
The fact that the branching ratios of these decays are negligible in the
standard model (SM) and the long distance effects are relatively smaller in
comparison to their charged dileptons counterparts, they are considered to
provide genuine null-tests of SM. Therefore the observation of these modes at
the level of current as well as planned experimental sensitivities would imply
unambiguous signature of new physics. Using the constraints on $Z'$ couplings
coming from a combined fit to $b \to s \ell \ell$, $\Delta M_s$ and neutrino
trident data, we find that any meaningful enhancement over the SM value is
ruled out in the considered framework. The same is true for $D - \bar{D}$
mixing observable $\Delta M_D$ along with $D^0 \to \mu^+ \mu^-$ and $D^+ \to
\pi^+ \mu^+ \mu^-$ decay modes which are induced through $c \to u \mu^+ \mu^-$
transition.
| [
{
"created": "Sun, 24 Oct 2021 14:11:53 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Feb 2022 10:19:56 GMT",
"version": "v2"
}
] | 2022-11-16 | [
[
"Alok",
"Ashutosh Kumar",
""
],
[
"Chundawat",
"Neetu Raj Singh",
""
],
[
"Kumar",
"Dinesh",
""
]
] | In this work, we study the impact of $b \to s \ell \ell$, $B_s - \bar{B_s}$ mixing and neutrino trident measurements on observables in decays induced by $c \to u $ transition in the context of a non-universal $Z'$ model which generates $C^{\rm NP}_{9} <0$ and $C^{\rm NP}_9 = - \,C^{\rm NP}_{10} $ new physics scenarios at the tree level. We inspect the effects on $D^0 \to \pi^0 \nu \bar{\nu}$, $D^+ \to \pi^+ \nu \bar{\nu}$ and $B_c \to B^+ \nu \bar{\nu} $ decays which are induced by the quark level transition $c \to u \nu \bar{\nu}$. The fact that the branching ratios of these decays are negligible in the standard model (SM) and the long distance effects are relatively smaller in comparison to their charged dileptons counterparts, they are considered to provide genuine null-tests of SM. Therefore the observation of these modes at the level of current as well as planned experimental sensitivities would imply unambiguous signature of new physics. Using the constraints on $Z'$ couplings coming from a combined fit to $b \to s \ell \ell$, $\Delta M_s$ and neutrino trident data, we find that any meaningful enhancement over the SM value is ruled out in the considered framework. The same is true for $D - \bar{D}$ mixing observable $\Delta M_D$ along with $D^0 \to \mu^+ \mu^-$ and $D^+ \to \pi^+ \mu^+ \mu^-$ decay modes which are induced through $c \to u \mu^+ \mu^-$ transition. |
hep-ph/0307386 | Bernd Kniehl | B.A. Kniehl, G. Kramer (Hamburg U.), C.P. Palisoc (Philippines U.) | chi_{c1} and chi_{c2} decay angular distributions at the Fermilab
Tevatron | 26 pages, 14 figures | Phys.Rev. D68 (2003) 114002 | 10.1103/PhysRevD.68.114002 | DESY 03-096 | hep-ph hep-ex | null | We consider the hadroproduction of chi_{c1} and chi_{c2} mesons and their
subsequent radiative decays to J/psi mesons and photons in the factorization
formalism of nonrelativistic quantum chromodynamics, and study the decay
angular distributions, by means of helicity density matrices, in view of their
sensitivity to color-octet processes. We present numerical results appropriate
for the Fermilab Tevatron.
| [
{
"created": "Thu, 31 Jul 2003 09:43:15 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Kniehl",
"B. A.",
"",
"Hamburg U."
],
[
"Kramer",
"G.",
"",
"Hamburg U."
],
[
"Palisoc",
"C. P.",
"",
"Philippines U."
]
] | We consider the hadroproduction of chi_{c1} and chi_{c2} mesons and their subsequent radiative decays to J/psi mesons and photons in the factorization formalism of nonrelativistic quantum chromodynamics, and study the decay angular distributions, by means of helicity density matrices, in view of their sensitivity to color-octet processes. We present numerical results appropriate for the Fermilab Tevatron. |
hep-ph/0612325 | Patricia Ball | Patricia Ball | Constraints on New Physics from gamma and |V_ub| | Talk given at CKM06; one reference added | null | null | IPPP/06/95 | hep-ph | null | The SM unitarity triangle (UT) is completely determined by the parameters
$\gamma$ and $|V_{ub}|$ which can be extracted from tree-level processes and
are assumed to be free of new physics. By comparison with other determinations
of UT parameters one can impose constraints on new physics in loop processes,
in particular $B$ mixing.
| [
{
"created": "Sun, 24 Dec 2006 15:46:04 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Jan 2007 14:15:21 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Ball",
"Patricia",
""
]
] | The SM unitarity triangle (UT) is completely determined by the parameters $\gamma$ and $|V_{ub}|$ which can be extracted from tree-level processes and are assumed to be free of new physics. By comparison with other determinations of UT parameters one can impose constraints on new physics in loop processes, in particular $B$ mixing. |
hep-ph/0402034 | C. A. de S. Pires | S. M. Lietti and C. A. de S. Pires | Testing Non commutative QED gamma-gamma-gamma and
gamma-gamma-gamma-gamma Couplings at LHC | minor changes, references added, version to appears in EPJC | Eur.Phys.J. C35 (2004) 137-143 | 10.1140/epjc/s2004-01777-5 | null | hep-ph | null | In this work, we investigate the sensitivity of the process p + p --> q + q
--> j + j + gamma + gamma at LHC for the photonic 3- and 4- point functions
that appear in non commutative QED. We show that this process serves to study
the behavior of the space-space as well as of the space-time non commutativity.
We also show that this process can probe the non commutative scale in the range
of few TeV.
| [
{
"created": "Tue, 3 Feb 2004 18:21:11 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Apr 2004 11:40:10 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Lietti",
"S. M.",
""
],
[
"Pires",
"C. A. de S.",
""
]
] | In this work, we investigate the sensitivity of the process p + p --> q + q --> j + j + gamma + gamma at LHC for the photonic 3- and 4- point functions that appear in non commutative QED. We show that this process serves to study the behavior of the space-space as well as of the space-time non commutativity. We also show that this process can probe the non commutative scale in the range of few TeV. |
1403.3778 | Renata Jora | Renata Jora, Joseph Schechter | A hint of a strong supersymmetric standard model | 6 pages, 2 figures | null | 10.1142/S0217751X14501929 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the supersymmetric standard model from the perspective that the up
and down Higgs supermultiplets are composite states. We show that a Higgs
multiplet in which the scalar states are bound states of two squarks and the
corresponding Higgsinos are bound states of a quark and an squark has the
correct supersymmetry transformations and may lead to an alternative model
which displays dynamical symmetry breaking. We describe this model through an
effective Higgs potential which by itself may lead to the correct mass of 125.9
GeV for the lightest Higgs boson and to other neutral scalar masses respecting
the experimental constraints.
| [
{
"created": "Sat, 15 Mar 2014 10:05:23 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Jora",
"Renata",
""
],
[
"Schechter",
"Joseph",
""
]
] | We discuss the supersymmetric standard model from the perspective that the up and down Higgs supermultiplets are composite states. We show that a Higgs multiplet in which the scalar states are bound states of two squarks and the corresponding Higgsinos are bound states of a quark and an squark has the correct supersymmetry transformations and may lead to an alternative model which displays dynamical symmetry breaking. We describe this model through an effective Higgs potential which by itself may lead to the correct mass of 125.9 GeV for the lightest Higgs boson and to other neutral scalar masses respecting the experimental constraints. |
hep-ph/0210309 | Yu. A. Simonov | Yu.A. Simonov (ITEP, Moscow) | Spectrum and Regge-trajectories in QCD | 15 pages, 1 eps figure, Latex2e, Invited Talk at the International
Seminar devoted to 80-th birthday of K.A. Ter-Martirosyan, to be published in
Proceedings | Phys.Atom.Nucl. 66 (2003) 2038-2044; Yad.Fiz. 66 (2003) 2088-2094 | 10.1134/1.1625746 | null | hep-ph | null | Starting in sixties an active group of physicists under the guidance of Prof.
K.A.Ter-Martirosyan was creating the theory of high-energy processes in QCD.
From the beginning the key element of this theory is the notion of Regge
trajectories and in particular of the pomeron trajectory, which have been
introduced phenomenologically. In this talk I review the problem of spectrum
and Regge trajectories as it can be derived from the nonperturbative QCD
dynamics.
| [
{
"created": "Wed, 23 Oct 2002 10:45:24 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Simonov",
"Yu. A.",
"",
"ITEP, Moscow"
]
] | Starting in sixties an active group of physicists under the guidance of Prof. K.A.Ter-Martirosyan was creating the theory of high-energy processes in QCD. From the beginning the key element of this theory is the notion of Regge trajectories and in particular of the pomeron trajectory, which have been introduced phenomenologically. In this talk I review the problem of spectrum and Regge trajectories as it can be derived from the nonperturbative QCD dynamics. |
1109.2562 | Stephen Barr | S.M. Barr | The Unification and Cogeneration of Dark Matter and Baryonic Matter | 17 pages, 2 figures, corrected typos and added references | null | 10.1103/PhysRevD.85.013001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In grand unified theories with gauge groups larger than SU(5), the multiplets
that contain the known quarks and leptons also contain fermions that are
singlets under the Standard Model gauge group. Some of these could be the dark
matter of the universe. Grand unified theories can also have accidental U(1)
global symmetries (analogous to B-L in minimal SU(5)) that can stabilize dark
matter. These ideas are illustrated in an SU(6) model.
| [
{
"created": "Mon, 12 Sep 2011 18:38:53 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Sep 2011 13:18:41 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Barr",
"S. M.",
""
]
] | In grand unified theories with gauge groups larger than SU(5), the multiplets that contain the known quarks and leptons also contain fermions that are singlets under the Standard Model gauge group. Some of these could be the dark matter of the universe. Grand unified theories can also have accidental U(1) global symmetries (analogous to B-L in minimal SU(5)) that can stabilize dark matter. These ideas are illustrated in an SU(6) model. |
1109.3231 | Nikolaos Kidonakis | Nikolaos Kidonakis | Top Quark Theoretical Cross Sections and pT and Rapidity Distributions | 8 pages, 10 figures; Proceedings of the DPF-2011 Conference,
Providence, RI, August 8-13, 2011 | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I present theoretical results for the top quark pair total cross section, and
for the top quark transverse momentum and rapidity distributions at Tevatron
and LHC energies. I also present results for single top quark production in the
t- and s-channels and also via associated production with a W boson. The
calculations include approximate NNLO corrections that are derived from NNLL
soft-gluon resummation.
| [
{
"created": "Thu, 15 Sep 2011 00:15:51 GMT",
"version": "v1"
}
] | 2011-09-16 | [
[
"Kidonakis",
"Nikolaos",
""
]
] | I present theoretical results for the top quark pair total cross section, and for the top quark transverse momentum and rapidity distributions at Tevatron and LHC energies. I also present results for single top quark production in the t- and s-channels and also via associated production with a W boson. The calculations include approximate NNLO corrections that are derived from NNLL soft-gluon resummation. |
hep-ph/0304074 | Stuart Raby | Stuart Raby | Phenomenology of the Minimal SO(10) SUSY Model | 14 pages, Invited talk at PASCOS'03, Mumbai, India, January 3 - 8,
2003, corrected equation in section 5.2 | Pramana62:523-536,2004 | 10.1007/BF02705106 | OHSTPY-HEP-T-03-005 | hep-ph | null | In this talk I define what I call the minimal SO(10) SUSY model. I then
discuss the phenomenological consequences of this theory, vis a vis gauge and
Yukawa coupling unification, Higgs and super-particle masses, the anomalous
magnetic moment of the muon, the decay $B_s \to \mu^+ \mu^-$ and dark matter.
| [
{
"created": "Mon, 7 Apr 2003 21:10:43 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Apr 2003 13:14:39 GMT",
"version": "v2"
},
{
"created": "Sat, 11 Oct 2003 15:17:51 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Raby",
"Stuart",
""
]
] | In this talk I define what I call the minimal SO(10) SUSY model. I then discuss the phenomenological consequences of this theory, vis a vis gauge and Yukawa coupling unification, Higgs and super-particle masses, the anomalous magnetic moment of the muon, the decay $B_s \to \mu^+ \mu^-$ and dark matter. |
0706.4244 | Marco Roncadelli | Marco Roncadelli | Behind Pvlas | Talk given at the ``XII International Workshop on Neutrino
Telescopes'' (to appear in the Proceedings) | null | null | null | hep-ph | null | We offer a detailed review of the physics behind the PVLAS experiment. We
also address some laboratory and astrophysical cross-checks for the recent
claim concerning a signal consistent with an Axion-Like Particle. Our aim is
that the leading role played by Emilio (Mimmo) Zavattini in this field of
research will become apparent.
| [
{
"created": "Thu, 28 Jun 2007 14:19:29 GMT",
"version": "v1"
}
] | 2007-06-29 | [
[
"Roncadelli",
"Marco",
""
]
] | We offer a detailed review of the physics behind the PVLAS experiment. We also address some laboratory and astrophysical cross-checks for the recent claim concerning a signal consistent with an Axion-Like Particle. Our aim is that the leading role played by Emilio (Mimmo) Zavattini in this field of research will become apparent. |
hep-ph/0501097 | Gavin Salam | G.P. Salam | Asymptotics and preasymptotics at small x | 7 pages. Talk presented at the QCD at cosmic energies workshop,
Ettore Majorana Centre, Erice, Italy, September 2004 | null | null | LPTHE-P05-02 | hep-ph | null | This talk discusses the relative impact of running-coupling and other
higher-order corrections on the small-x gluon-gluon splitting function.
Comments are made on similarities with some aspects of the Balitsky-Kovchegov
equation, which arise because of the presence of an effective infrared cutoff
in both cases. It is emphasised that, at least in the splitting-function case,
the asymptotic small-x behaviour has little relevance to the phenomenologically
interesting preasymptotic region. This is illustrated with the aid of a
convolution of the resummed splitting function with a toy gluon distribution.
| [
{
"created": "Wed, 12 Jan 2005 15:25:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Salam",
"G. P.",
""
]
] | This talk discusses the relative impact of running-coupling and other higher-order corrections on the small-x gluon-gluon splitting function. Comments are made on similarities with some aspects of the Balitsky-Kovchegov equation, which arise because of the presence of an effective infrared cutoff in both cases. It is emphasised that, at least in the splitting-function case, the asymptotic small-x behaviour has little relevance to the phenomenologically interesting preasymptotic region. This is illustrated with the aid of a convolution of the resummed splitting function with a toy gluon distribution. |
hep-ph/0302271 | C. A. Dominguez | H. Castillo, C.A. Dominguez, M. Loewe | Electromagnetic nucleon form factors from QCD sum rules | Replaced Version. An error has been corrected in the numerical
evaluation of the Pauli form factor. This changes the results for F_2(q^2),
as well as the conclusions | JHEP 0503 (2005) 012 | 10.1088/1126-6708/2005/03/012 | UCT-TP-260/03 | hep-ph | null | The electromagnetic form factors of the nucleon, in the space-like region,
are determined from three-point function Finite Energy QCD Sum Rules. The QCD
calculation is performed to leading order in perturbation theory in the chiral
limit, and to leading order in the non-perturbative power corrections. The
results for the Dirac form factor, $F_1(q^2)$, are in very good agreement with
data for both the proton and the neutron, in the currently accessible
experimental region of momentum transfers. This is not the case, though, for
the Pauli form factor $F_2(q^2)$, which has a soft $q^2$-dependence
proportional to the quark condensate $<0|\bar{q}q|0>$.
| [
{
"created": "Fri, 28 Feb 2003 09:49:26 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jan 2005 17:56:36 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Castillo",
"H.",
""
],
[
"Dominguez",
"C. A.",
""
],
[
"Loewe",
"M.",
""
]
] | The electromagnetic form factors of the nucleon, in the space-like region, are determined from three-point function Finite Energy QCD Sum Rules. The QCD calculation is performed to leading order in perturbation theory in the chiral limit, and to leading order in the non-perturbative power corrections. The results for the Dirac form factor, $F_1(q^2)$, are in very good agreement with data for both the proton and the neutron, in the currently accessible experimental region of momentum transfers. This is not the case, though, for the Pauli form factor $F_2(q^2)$, which has a soft $q^2$-dependence proportional to the quark condensate $<0|\bar{q}q|0>$. |
1906.06364 | Divya Sachdeva | Debajyoti Choudhury and Divya Sachdeva | Model Independent analysis of MeV scale dark matter: II. Implications
from $e^-e^+$ colliders and Direct Detection | 33 pages, 8 figures | Phys. Rev. D 100, 075007 (2019) | 10.1103/PhysRevD.100.075007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark matter particles with masses in the sub-GeV range have escaped severe
constraints from direct detection experiments such as LUX, PANDAX-II and
XENON100 as the corresponding recoil energies are, largely, lower than the
detector thresholds. In a companion paper, we demonstrated, in a model
independent approach, that a significantly large fraction of the parameter
space escapes the cosmological and astrophysical constraints. We show here,
though, that the remaining parameter space lends itself to the possibility of
discovery at both direct detection experiments (such as CRESST-II) as well as
in a low-energy collider such as Belle-II.
| [
{
"created": "Fri, 14 Jun 2019 18:42:52 GMT",
"version": "v1"
}
] | 2019-10-16 | [
[
"Choudhury",
"Debajyoti",
""
],
[
"Sachdeva",
"Divya",
""
]
] | Dark matter particles with masses in the sub-GeV range have escaped severe constraints from direct detection experiments such as LUX, PANDAX-II and XENON100 as the corresponding recoil energies are, largely, lower than the detector thresholds. In a companion paper, we demonstrated, in a model independent approach, that a significantly large fraction of the parameter space escapes the cosmological and astrophysical constraints. We show here, though, that the remaining parameter space lends itself to the possibility of discovery at both direct detection experiments (such as CRESST-II) as well as in a low-energy collider such as Belle-II. |
2401.01820 | Roger Balsach | Roger Balsach, Domenico Bonocore and Anna Kulesza | The emission of soft-photons and the LBK theorem, revisited | 7 pages, 4 figures, MTTD23 proceedings | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Predictions for processes involving soft photons, up to next-to-leading power
(NLP) in the photon energy, can be obtained using the Low-Burnett-Kroll (LBK)
theorem. The consistency of the theorem has been a recent topic of
investigation since it is traditionally formulated in terms of a non-radiative
amplitude, which is evaluated with unphysical momenta. We address such
questions and propose a formulation of the LBK theorem which relies on the
evaluation of the non-radiative amplitude with on-shell, physical momenta. We
use this form to numerically study the impact of NLP contributions to
cross-sections for $pp$ and $e^-e^+$ processes involving soft-photon emission.
| [
{
"created": "Wed, 3 Jan 2024 16:26:06 GMT",
"version": "v1"
}
] | 2024-01-04 | [
[
"Balsach",
"Roger",
""
],
[
"Bonocore",
"Domenico",
""
],
[
"Kulesza",
"Anna",
""
]
] | Predictions for processes involving soft photons, up to next-to-leading power (NLP) in the photon energy, can be obtained using the Low-Burnett-Kroll (LBK) theorem. The consistency of the theorem has been a recent topic of investigation since it is traditionally formulated in terms of a non-radiative amplitude, which is evaluated with unphysical momenta. We address such questions and propose a formulation of the LBK theorem which relies on the evaluation of the non-radiative amplitude with on-shell, physical momenta. We use this form to numerically study the impact of NLP contributions to cross-sections for $pp$ and $e^-e^+$ processes involving soft-photon emission. |
2203.13579 | Marco Zaccheddu | Marco Zaccheddu, Umberto D'Alesio, Leonard Gamberg and Francesco
Murgia | Extracting the $\Lambda$ Polarizing Fragmentation Function from Belle
$e^+e^-$ Data Within the TMD Formalism | 6 pages, 2 figures (5 plots), presented by M. Zaccheddu at the 24th
International Spin Symposium (SPIN2021), 18-22 October 2021, Matsue, Japan | null | 10.7566/JPSCP.37.020111 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Data from the Belle Collaboration for associated production (with a light
unpolarized hadron) and single-inclusive production of transversely polarized
$\Lambda$-hyperons in $e^+e^-$ annihilation processes allowed to extract within
a TMD approach, for the first time, the $\Lambda$ polarizing fragmentation
function. Recent theoretical developments on the computation of cross sections
for single-inclusive hadron production in $e^+e^-$ annihilation processes,
within a Soft Collinear Effective Theory approach, combined with the CSS
formalism for the double-hadron production case, can be used to perform a
renewed analysis, adopting a full TMD factorization scheme. Preliminary results
and a comparison between the two analyses are presented.
| [
{
"created": "Fri, 25 Mar 2022 11:14:09 GMT",
"version": "v1"
}
] | 2023-01-18 | [
[
"Zaccheddu",
"Marco",
""
],
[
"D'Alesio",
"Umberto",
""
],
[
"Gamberg",
"Leonard",
""
],
[
"Murgia",
"Francesco",
""
]
] | Data from the Belle Collaboration for associated production (with a light unpolarized hadron) and single-inclusive production of transversely polarized $\Lambda$-hyperons in $e^+e^-$ annihilation processes allowed to extract within a TMD approach, for the first time, the $\Lambda$ polarizing fragmentation function. Recent theoretical developments on the computation of cross sections for single-inclusive hadron production in $e^+e^-$ annihilation processes, within a Soft Collinear Effective Theory approach, combined with the CSS formalism for the double-hadron production case, can be used to perform a renewed analysis, adopting a full TMD factorization scheme. Preliminary results and a comparison between the two analyses are presented. |
1302.3909 | Diego Guadagnoli | Diego Guadagnoli, Gino Isidori | BR(Bs to mu+ mu-) as an electroweak precision test | 8 pages, 1 figure. v3: minor textual modifications; minor update in
the numerics; no change in results. Matches journal version (PLB) | Phys.Lett.B724:63-67,2013 | 10.1016/j.physletb.2013.05.054 | LAPTH-010/13, CERN-PH-TH/2013-028 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using an effective-theory approach, we analyze the impact of BR(Bs to mu+
mu-) in constraining new-physics models that predict modifications of the
Z-boson couplings to down-type quarks. Under motivated assumptions about the
flavor structure of the effective theory, we show that the bounds presently
derived from BR(Bs to mu+ mu-) on the effective Z-boson couplings are
comparable (in the case of minimal flavor violation) or significantly more
stringent (in the case of generic partial compositeness) with respect to those
derived from observables at the Z peak.
| [
{
"created": "Fri, 15 Feb 2013 22:38:51 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Mar 2013 12:53:56 GMT",
"version": "v2"
},
{
"created": "Tue, 11 Jun 2013 07:55:29 GMT",
"version": "v3"
}
] | 2013-12-05 | [
[
"Guadagnoli",
"Diego",
""
],
[
"Isidori",
"Gino",
""
]
] | Using an effective-theory approach, we analyze the impact of BR(Bs to mu+ mu-) in constraining new-physics models that predict modifications of the Z-boson couplings to down-type quarks. Under motivated assumptions about the flavor structure of the effective theory, we show that the bounds presently derived from BR(Bs to mu+ mu-) on the effective Z-boson couplings are comparable (in the case of minimal flavor violation) or significantly more stringent (in the case of generic partial compositeness) with respect to those derived from observables at the Z peak. |
hep-ph/0605107 | Amitabha Lahiri | Chandrasekhar Chatterjee and Amitabha Lahiri | Monopole confinement by flux tube | 7pp; brief additions relating monopole strength to winding number,
and discussion on length of stable flux tube; one reference added | Europhys.Lett.76:1068-1073,2006 | 10.1209/epl/i2006-10378-y | null | hep-ph hep-lat hep-th | null | We revisit Nambu's model of quark confinement by a tube of magnetic flux,
with two additional features. The quarks are taken to be magnetic monopoles
external to the tube, which seal the ends, and are also taken to be fermions.
This ensures that the model is inconsistent unless there are at least two
species of fermions being confined.
| [
{
"created": "Wed, 10 May 2006 07:20:03 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Oct 2006 09:26:04 GMT",
"version": "v2"
}
] | 2010-12-17 | [
[
"Chatterjee",
"Chandrasekhar",
""
],
[
"Lahiri",
"Amitabha",
""
]
] | We revisit Nambu's model of quark confinement by a tube of magnetic flux, with two additional features. The quarks are taken to be magnetic monopoles external to the tube, which seal the ends, and are also taken to be fermions. This ensures that the model is inconsistent unless there are at least two species of fermions being confined. |
1907.01665 | Alexander I Nesterov | Alexander I Nesterov, Gennady P Berman, Vladimir Tsifrinovich, Xidi
Wang and Marco Merkli | Dark Matter Spin-Spin Interaction through the Pseudo-Scalar Vacuum Field | Typos corrected, accepted version | null | 10.1142/S0217732320501175 | LA-UR-19-26221 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We suggest that the pseudo-scalar vacuum field (PSV) in the dark matter (DM)
sector of the Universe may be as important as the electromagnetic vacuum field
in the baryonic sector. In particular, the spin-spin interaction between the DM
fermions, mediated by PSV, may represent the strongest interaction between the
DM fermions due to the absence of the electric charge and the magnetic dipole
moment. Based on this assumption, we consider the influence of the spin-spin
interaction, mediated by PSV, on the spin precession of the DM fermions (e. g.
neutralino). In the secular approximation, we obtain the exact expression
describing the frequency of the precession and estimate the decoherence rate.
| [
{
"created": "Tue, 2 Jul 2019 22:20:06 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Feb 2020 15:39:20 GMT",
"version": "v2"
}
] | 2020-06-24 | [
[
"Nesterov",
"Alexander I",
""
],
[
"Berman",
"Gennady P",
""
],
[
"Tsifrinovich",
"Vladimir",
""
],
[
"Wang",
"Xidi",
""
],
[
"Merkli",
"Marco",
""
]
] | We suggest that the pseudo-scalar vacuum field (PSV) in the dark matter (DM) sector of the Universe may be as important as the electromagnetic vacuum field in the baryonic sector. In particular, the spin-spin interaction between the DM fermions, mediated by PSV, may represent the strongest interaction between the DM fermions due to the absence of the electric charge and the magnetic dipole moment. Based on this assumption, we consider the influence of the spin-spin interaction, mediated by PSV, on the spin precession of the DM fermions (e. g. neutralino). In the secular approximation, we obtain the exact expression describing the frequency of the precession and estimate the decoherence rate. |
hep-ph/0102106 | Marieke Postma | Marieke Postma | Neutrinos as a signature of ultrahigh energy photons at high red shift | 8 pages, 5 figures | Phys.Rev. D64 (2001) 023001 | 10.1103/PhysRevD.64.023001 | UCLA/01/TEP/2 | hep-ph astro-ph | null | Sources of ultrahigh energy photons operating at high red shift produce a
diffuse background of neutrinos. At high red shift, when the cosmic microwave
background radiation has a higher temperature, an electromagnetic cascade
originated by an energetic photon can generate neutrinos via muon and pion
production and decay. We have calculated numerically the neutrino spectrum
produced by various photon sources. A distinctive feature of the produced flux
is a ``bump'' in the spectrum at neutrino energies $E \sim 10^{17}$eV. The
produced flux is largest for $m=3$ sources ({\it e.g} necklaces), with $E^2
J(E) \sim 10 {\rm eV} {\rm cm}^{-2} {\rm s}^{-1} {\rm sr}^{-1}$ at these
energies. Detection of such neutrinos can help understand the origin of
ultrahigh energy cosmic rays.
| [
{
"created": "Thu, 8 Feb 2001 20:16:17 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Postma",
"Marieke",
""
]
] | Sources of ultrahigh energy photons operating at high red shift produce a diffuse background of neutrinos. At high red shift, when the cosmic microwave background radiation has a higher temperature, an electromagnetic cascade originated by an energetic photon can generate neutrinos via muon and pion production and decay. We have calculated numerically the neutrino spectrum produced by various photon sources. A distinctive feature of the produced flux is a ``bump'' in the spectrum at neutrino energies $E \sim 10^{17}$eV. The produced flux is largest for $m=3$ sources ({\it e.g} necklaces), with $E^2 J(E) \sim 10 {\rm eV} {\rm cm}^{-2} {\rm s}^{-1} {\rm sr}^{-1}$ at these energies. Detection of such neutrinos can help understand the origin of ultrahigh energy cosmic rays. |
2404.18993 | Luca Di Luzio | Carlo Broggini, Giuseppe Di Carlo, Luca Di Luzio, Claudio Toni | Alpha radioactivity deep-underground as a probe of axion dark matter | 7 pages, 3 figures. Added an Appendix providing an analytical
treatment of the theta dependence of alpha decay. Version to appear in
Physics Letters B | null | null | null | hep-ph hep-ex nucl-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | We propose to investigate the time modulation of radioisotope decays deep
underground as a method to explore axion dark matter. In this work, we focus on
the $\alpha$-decay of heavy isotopes and develop a theoretical description for
the $\theta$-dependence of $\alpha$-decay half-lives, which enables us to
predict the time variation of $\alpha$-radioactivity in response to an
oscillating axion dark matter background. To probe this scenario, we have
recently constructed and installed a setup deep underground at the Gran Sasso
Laboratory, based on the $\alpha$-decay of Americium-241. This prototype
experiment, named RadioAxion-$\alpha$, will allow us to explore a broad range
of oscillation's periods, from a micro-second up to one year, thus providing
competitive limits on the axion decay constant across 13 orders of magnitude in
the axion mass, ranging from $10^{-9}$ eV to $10^{-20}$ eV after one month of
data collection, and down to $10^{-22}$ eV after three years.
| [
{
"created": "Mon, 29 Apr 2024 18:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jun 2024 10:07:12 GMT",
"version": "v2"
}
] | 2024-06-26 | [
[
"Broggini",
"Carlo",
""
],
[
"Di Carlo",
"Giuseppe",
""
],
[
"Di Luzio",
"Luca",
""
],
[
"Toni",
"Claudio",
""
]
] | We propose to investigate the time modulation of radioisotope decays deep underground as a method to explore axion dark matter. In this work, we focus on the $\alpha$-decay of heavy isotopes and develop a theoretical description for the $\theta$-dependence of $\alpha$-decay half-lives, which enables us to predict the time variation of $\alpha$-radioactivity in response to an oscillating axion dark matter background. To probe this scenario, we have recently constructed and installed a setup deep underground at the Gran Sasso Laboratory, based on the $\alpha$-decay of Americium-241. This prototype experiment, named RadioAxion-$\alpha$, will allow us to explore a broad range of oscillation's periods, from a micro-second up to one year, thus providing competitive limits on the axion decay constant across 13 orders of magnitude in the axion mass, ranging from $10^{-9}$ eV to $10^{-20}$ eV after one month of data collection, and down to $10^{-22}$ eV after three years. |
2212.09757 | Michael Landry | Michael J. Landry and Hong Liu | A systematic formulation of chiral anomalous magnetohydrodynamics | v2 clarifies the nature of the chrial wave in the linearized
perturbations, added references, 24 pages | null | null | MIT-CTP/5509 | hep-ph astro-ph.HE cond-mat.mes-hall hep-th nucl-th | http://creativecommons.org/licenses/by/4.0/ | We present a new way of deriving effective theories of dynamical
electromagnetic fields in general media. It can be used to give a systematic
formulation of magnetohydrodynamics (MHD) with strong magnetic fields,
including systems with chiral matter and Adler-Bell-Jackiw (ABJ) anomaly. We
work in the regime in which velocity and temperature fluctuations can be
neglected. The resulting chiral anomalous MHD incorporates and generalizes the
chiral magnetic effect, the chiral separation effect, the chiral electric
separation effect, as well as recently derived strong-field MHD, all in a
single coherent framework. At linearized level, the theory predicts that the
chiral magnetic wave does not survive dynamical electromagnetic fields. A
different chiral wave, to which we refer as the chiral magnetic electric
separation wave, emerges as a result of dynamical versions of the chiral
electric separation effect and the chiral magnetic effect. We predict its wave
velocity. We also introduce a simple, but solvable nonlinear model to explore
the fate of the chiral instability.
| [
{
"created": "Mon, 19 Dec 2022 19:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Jan 2023 15:50:00 GMT",
"version": "v2"
}
] | 2023-01-10 | [
[
"Landry",
"Michael J.",
""
],
[
"Liu",
"Hong",
""
]
] | We present a new way of deriving effective theories of dynamical electromagnetic fields in general media. It can be used to give a systematic formulation of magnetohydrodynamics (MHD) with strong magnetic fields, including systems with chiral matter and Adler-Bell-Jackiw (ABJ) anomaly. We work in the regime in which velocity and temperature fluctuations can be neglected. The resulting chiral anomalous MHD incorporates and generalizes the chiral magnetic effect, the chiral separation effect, the chiral electric separation effect, as well as recently derived strong-field MHD, all in a single coherent framework. At linearized level, the theory predicts that the chiral magnetic wave does not survive dynamical electromagnetic fields. A different chiral wave, to which we refer as the chiral magnetic electric separation wave, emerges as a result of dynamical versions of the chiral electric separation effect and the chiral magnetic effect. We predict its wave velocity. We also introduce a simple, but solvable nonlinear model to explore the fate of the chiral instability. |
1608.03894 | Wan-Zhe Feng | Alejandro Celis, Wan-Zhe Feng, Martin Vollmann | Dirac dark matter and $b \to s \ell^+ \ell^-$ with $\mathrm{U(1)}$ gauge
symmetry | 12 pages, 2 figures | Phys. Rev. D 95, 035018 (2017) | 10.1103/PhysRevD.95.035018 | LMU-ASC 39/16, TUM-HEP-1069/16 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the possibility of a Dirac fermion dark matter candidate in the
light of current $b \to s \ell^+ \ell^-$ anomalies by investigating a minimal
extension of the Standard Model with a horizontal $\mathrm{U(1)}^{\prime}$
local symmetry. Dark matter stability is protected by a remnant $\mathcal{Z}_2$
symmetry arising after spontaneous symmetry breaking of
$\mathrm{U(1)}^{\prime}$. The associated $Z^{\prime}$ gauge boson can
accommodate current hints of new physics in $b \to s \ell^+ \ell^-$ decays, and
acts as a vector portal between dark matter and the visible sector. We find
that the model is severely constrained by a combination of precision
measurements at flavour factories, LHC searches for dilepton resonances, as
well as direct and indirect dark matter searches. Despite this, viable regions
of the parameter space accommodating the observed dark matter relic abundance
and the $b \to s \ell^+ \ell^-$ anomalies still persist for dark matter and
$Z^{\prime}$ masses in the TeV range.
| [
{
"created": "Fri, 12 Aug 2016 20:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Feb 2017 20:45:46 GMT",
"version": "v2"
}
] | 2017-02-27 | [
[
"Celis",
"Alejandro",
""
],
[
"Feng",
"Wan-Zhe",
""
],
[
"Vollmann",
"Martin",
""
]
] | We revisit the possibility of a Dirac fermion dark matter candidate in the light of current $b \to s \ell^+ \ell^-$ anomalies by investigating a minimal extension of the Standard Model with a horizontal $\mathrm{U(1)}^{\prime}$ local symmetry. Dark matter stability is protected by a remnant $\mathcal{Z}_2$ symmetry arising after spontaneous symmetry breaking of $\mathrm{U(1)}^{\prime}$. The associated $Z^{\prime}$ gauge boson can accommodate current hints of new physics in $b \to s \ell^+ \ell^-$ decays, and acts as a vector portal between dark matter and the visible sector. We find that the model is severely constrained by a combination of precision measurements at flavour factories, LHC searches for dilepton resonances, as well as direct and indirect dark matter searches. Despite this, viable regions of the parameter space accommodating the observed dark matter relic abundance and the $b \to s \ell^+ \ell^-$ anomalies still persist for dark matter and $Z^{\prime}$ masses in the TeV range. |
1403.2271 | Leonard S. Kisslinger | Leonard S. Kisslinger and Debasish Das | $\Psi$ and $\Upsilon$ Production In pp Collisions at 8.0 TeV | 5 pages, 2 figures | Mod. Phys. Lett. A, Vol. 29, No. 16 (2014) 1450082 | 10.1142/S0217732314500825 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is an extension of recent studies for $\Upsilon(nS), n=1,2,3,$ and
$J/\Psi(1S),\Psi(2S)$ production at the LHC in pp collisions, and with the
ALICE detector at 7.0 TeV, with new predictions at 8.0 TeV
| [
{
"created": "Mon, 10 Mar 2014 15:43:30 GMT",
"version": "v1"
},
{
"created": "Wed, 28 May 2014 19:12:18 GMT",
"version": "v2"
}
] | 2014-05-29 | [
[
"Kisslinger",
"Leonard S.",
""
],
[
"Das",
"Debasish",
""
]
] | This is an extension of recent studies for $\Upsilon(nS), n=1,2,3,$ and $J/\Psi(1S),\Psi(2S)$ production at the LHC in pp collisions, and with the ALICE detector at 7.0 TeV, with new predictions at 8.0 TeV |
hep-ph/9905268 | Youngman Kim | Youngman Kim and Hyun Kyu Lee (Univ. of Hanyang) | Renormalization Group Analysis of \rho-Meson Properties at Finite
Density | 24 pages, 10 figures, revised version | Phys.Rev. C62 (2000) 037901 | 10.1103/PhysRevC.62.037901 | null | hep-ph | null | We calculate the density dependence of the $\rho$-meson mass and coupling
constant($g_{\rho NN}$) for $\rho$-nucleon-nucleon vertex at one loop using the
lagrangian where the $\rho$-meson is included as a dynamical gauge boson of a
hidden local symmetry. From the condition that thermodynamic potential should
not depend on the arbitrary energy scale, renormalization scale, one can
construct a renormalization group equation for the thermodynamic potential and
argue that the various renormalization group coefficients are functions of the
density or temperature. We calculate the $\beta$-function for
$\rho$-nucleon-nucleon coupling constant ($g_{\rho NN}$) and $\gamma$-function
for $\rho$-meson mass ($\gamma_{m_\rho}$). We found that the $\rho$-meson mass
and the coupling constant for $g_{\rho NN}$ drop as density increases in the
low energy limit.
| [
{
"created": "Fri, 7 May 1999 05:30:10 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Aug 1999 05:40:19 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Nov 1999 17:31:21 GMT",
"version": "v3"
}
] | 2016-09-06 | [
[
"Kim",
"Youngman",
"",
"Univ. of Hanyang"
],
[
"Lee",
"Hyun Kyu",
"",
"Univ. of Hanyang"
]
] | We calculate the density dependence of the $\rho$-meson mass and coupling constant($g_{\rho NN}$) for $\rho$-nucleon-nucleon vertex at one loop using the lagrangian where the $\rho$-meson is included as a dynamical gauge boson of a hidden local symmetry. From the condition that thermodynamic potential should not depend on the arbitrary energy scale, renormalization scale, one can construct a renormalization group equation for the thermodynamic potential and argue that the various renormalization group coefficients are functions of the density or temperature. We calculate the $\beta$-function for $\rho$-nucleon-nucleon coupling constant ($g_{\rho NN}$) and $\gamma$-function for $\rho$-meson mass ($\gamma_{m_\rho}$). We found that the $\rho$-meson mass and the coupling constant for $g_{\rho NN}$ drop as density increases in the low energy limit. |
0712.2903 | Vyacheslav Rychkov | Riccardo Barbieri, Lawrence J. Hall, Anastasios Y. Papaioannou, Duccio
Pappadopulo, Vyacheslav S. Rychkov | An alternative NMSSM phenomenology with manifest perturbative
unification | 19 pages, 13 figures; v2: possibility of pseudo-Goldstone below 2m_b
threshold added, version published by JHEP | JHEP0803:005,2008 | 10.1088/1126-6708/2008/03/005 | UCB-PTH-06/04 | hep-ph | null | Can supersymmetric models with a moderate stop mass be made consistent with
the negative Higgs boson searches at LEP, while keeping perturbative
unification manifest? The NMSSM achieves this rather easily, but only if extra
matter multiplets filling complete SU(5) representations are present at
intermediate energies. As a concrete example which makes use of this feature,
we give an analytic description of the phenomenology of a constrained NMSSM
close to a Peccei-Quinn symmetry point. The related pseudo-Goldstone boson
appears in decays of the Higgs bosons and possibly of the lightest neutralino,
and itself decays into (b anti-b) and (tau anti-tau).
| [
{
"created": "Tue, 18 Dec 2007 09:29:52 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Mar 2008 12:26:24 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Barbieri",
"Riccardo",
""
],
[
"Hall",
"Lawrence J.",
""
],
[
"Papaioannou",
"Anastasios Y.",
""
],
[
"Pappadopulo",
"Duccio",
""
],
[
"Rychkov",
"Vyacheslav S.",
""
]
] | Can supersymmetric models with a moderate stop mass be made consistent with the negative Higgs boson searches at LEP, while keeping perturbative unification manifest? The NMSSM achieves this rather easily, but only if extra matter multiplets filling complete SU(5) representations are present at intermediate energies. As a concrete example which makes use of this feature, we give an analytic description of the phenomenology of a constrained NMSSM close to a Peccei-Quinn symmetry point. The related pseudo-Goldstone boson appears in decays of the Higgs bosons and possibly of the lightest neutralino, and itself decays into (b anti-b) and (tau anti-tau). |
0911.1134 | Sebastian Cassel | S. Cassel, D. M. Ghilencea, G. G. Ross | Testing SUSY | 12 pages, 7 figures; references added, figures updated for extended
parameter space scan | Phys.Lett.B687:214-218,2010 | 10.1016/j.physletb.2010.03.032 | OUTP-0924P, CERN-PH-TH-2009-209 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If SUSY provides a solution to the hierarchy problem then supersymmetric
states should not be too heavy. This requirement is quantified by a fine tuning
measure that provides a quantitative test of SUSY as a solution to the
hierarchy problem. The measure is useful in correlating the impact of the
various experimental measurements relevant to the search for supersymmetry and
also in identifying the most sensitive measurements for testing SUSY. In this
paper we apply the measure to the CMSSM, computing it to two-loop order and
taking account of current experimental limits and the constraint on dark matter
abundance. Using this we determine the present limits on the CMSSM parameter
space and identify the measurements at the LHC that are most significant in
covering the remaining parameter space. Without imposing the LEP Higgs mass
bound we show that the smallest fine tuning (1:13) consistent with a relic
density within the WMAP bound corresponds to a Higgs mass of 114$\pm$2 GeV.
Fine tuning rises rapidly for heavier Higgs.
| [
{
"created": "Fri, 6 Nov 2009 10:13:06 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Feb 2010 17:14:02 GMT",
"version": "v2"
}
] | 2010-05-07 | [
[
"Cassel",
"S.",
""
],
[
"Ghilencea",
"D. M.",
""
],
[
"Ross",
"G. G.",
""
]
] | If SUSY provides a solution to the hierarchy problem then supersymmetric states should not be too heavy. This requirement is quantified by a fine tuning measure that provides a quantitative test of SUSY as a solution to the hierarchy problem. The measure is useful in correlating the impact of the various experimental measurements relevant to the search for supersymmetry and also in identifying the most sensitive measurements for testing SUSY. In this paper we apply the measure to the CMSSM, computing it to two-loop order and taking account of current experimental limits and the constraint on dark matter abundance. Using this we determine the present limits on the CMSSM parameter space and identify the measurements at the LHC that are most significant in covering the remaining parameter space. Without imposing the LEP Higgs mass bound we show that the smallest fine tuning (1:13) consistent with a relic density within the WMAP bound corresponds to a Higgs mass of 114$\pm$2 GeV. Fine tuning rises rapidly for heavier Higgs. |
1007.0075 | Hiroshi Yokoya | Yukinari Sumino, Hiroshi Yokoya | Bound-state effects on kinematical distributions of top quarks at hadron
colliders | 40 pages, 25 figures; minor corrections, references added; a typo in
Eq. (B.9) corrected | JHEP 1009:034,2010 | 10.1007/JHEP09(2010)034 | TU-867; CERN-PH-TH-2010-147 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | First we present a theoretical framework to compute the fully differential
cross sections for the top-quark productions and their subsequent decays at
hadron colliders, incorporating the bound-state effects which are important in
the t\bar{t} threshold region. We include the bound-state effects such that the
cross sections are correct in the LO approximation both in the threshold and
high-energy regions. Then, based on this framework we compute various
kinematical distributions of top quarks as well as of their decay products at
the LHC, by means of Monte-Carlo event-generation. These are compared with the
corresponding predictions based on conventional perturbative QCD. In
particular, we find a characteristic bound-state effect on the
(bW^+)-(\bar{b}W^-) double-invariant-mass distribution, which is deformed to
the lower invariant-mass side in a correlated manner.
| [
{
"created": "Thu, 1 Jul 2010 06:39:38 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Aug 2010 22:44:03 GMT",
"version": "v2"
},
{
"created": "Tue, 7 Jun 2016 14:01:21 GMT",
"version": "v3"
}
] | 2016-06-08 | [
[
"Sumino",
"Yukinari",
""
],
[
"Yokoya",
"Hiroshi",
""
]
] | First we present a theoretical framework to compute the fully differential cross sections for the top-quark productions and their subsequent decays at hadron colliders, incorporating the bound-state effects which are important in the t\bar{t} threshold region. We include the bound-state effects such that the cross sections are correct in the LO approximation both in the threshold and high-energy regions. Then, based on this framework we compute various kinematical distributions of top quarks as well as of their decay products at the LHC, by means of Monte-Carlo event-generation. These are compared with the corresponding predictions based on conventional perturbative QCD. In particular, we find a characteristic bound-state effect on the (bW^+)-(\bar{b}W^-) double-invariant-mass distribution, which is deformed to the lower invariant-mass side in a correlated manner. |
1311.4247 | Eugenio Del Nobile | Eugenio Del Nobile, Graciela B. Gelmini, Paolo Gondolo, Ji-Haeng Huh | Update on Light WIMP Limits: LUX, lite and Light | 15 pages, 15 figures. v2: minor revisions and CoGeNT 2014 data added | null | 10.1088/1475-7516/2014/03/014 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reexamine the current direct dark matter data including the recent
CDMSlite and LUX data, assuming that the dark matter consists of light WIMPs,
with mass close to 10 GeV/$c^2$ with spin-independent and isospin-conserving or
isospin-violating interactions. We compare the data with a standard model for
the dark halo of our galaxy and also in a halo-independent manner. In our
standard-halo analysis, we find that for isospin-conserving couplings, CDMSlite
and LUX together exclude the DAMA, CoGeNT, CDMS-II-Si, and CRESST-II possible
WIMP signal regions. For isospin-violating couplings instead, we find that a
substantial portion of the CDMS-II-Si region is compatible with all exclusion
limits. In our halo-independent analysis, we find that for isospin-conserving
couplings, the situation is of strong tension between the positive and negative
results, as it was before the LUX and CDMSlite bounds, which turn out to
exclude the same possible WIMP signals as previous limits. For
isospin-violating couplings, we find that LUX and CDMS-II-Si bounds together
exclude or severely constrain the DAMA, CoGeNT and CRESST-II possible WIMP
signals.
| [
{
"created": "Mon, 18 Nov 2013 02:39:03 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Feb 2014 00:47:34 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Del Nobile",
"Eugenio",
""
],
[
"Gelmini",
"Graciela B.",
""
],
[
"Gondolo",
"Paolo",
""
],
[
"Huh",
"Ji-Haeng",
""
]
] | We reexamine the current direct dark matter data including the recent CDMSlite and LUX data, assuming that the dark matter consists of light WIMPs, with mass close to 10 GeV/$c^2$ with spin-independent and isospin-conserving or isospin-violating interactions. We compare the data with a standard model for the dark halo of our galaxy and also in a halo-independent manner. In our standard-halo analysis, we find that for isospin-conserving couplings, CDMSlite and LUX together exclude the DAMA, CoGeNT, CDMS-II-Si, and CRESST-II possible WIMP signal regions. For isospin-violating couplings instead, we find that a substantial portion of the CDMS-II-Si region is compatible with all exclusion limits. In our halo-independent analysis, we find that for isospin-conserving couplings, the situation is of strong tension between the positive and negative results, as it was before the LUX and CDMSlite bounds, which turn out to exclude the same possible WIMP signals as previous limits. For isospin-violating couplings, we find that LUX and CDMS-II-Si bounds together exclude or severely constrain the DAMA, CoGeNT and CRESST-II possible WIMP signals. |
2207.11308 | Luis A Delgadillo | Rub\'en Cordero, Luis A. Delgadillo, O. G. Miranda | European Spallation Source as a searching tool for an ultralight scalar
field | 27 pages, 3 figures. Section added, extended discussion. To appear in
PRD | null | 10.1103/PhysRevD.107.075023 | null | hep-ph astro-ph.HE gr-qc hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark matter (DM) nature is one of the major issues in physics. The search for
a DM candidate has motivated the known proposal of an ultralight scalar field
(ULSF). We explore the possibility to search for this ULSF at the upcoming
European Spallation Source neutrino Super-Beam experiment. We have considered
the recent study case in which there could be an interaction between the ULSF
and active neutrinos. We have found that in this future experimental setup, the
sensitivity is competitive with other neutrino physics experiments. We show the
expected future sensitivity for the main parameter modeling the interaction
between ULSF and neutrinos.
| [
{
"created": "Fri, 22 Jul 2022 19:33:02 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Apr 2023 00:01:55 GMT",
"version": "v2"
}
] | 2023-05-03 | [
[
"Cordero",
"Rubén",
""
],
[
"Delgadillo",
"Luis A.",
""
],
[
"Miranda",
"O. G.",
""
]
] | Dark matter (DM) nature is one of the major issues in physics. The search for a DM candidate has motivated the known proposal of an ultralight scalar field (ULSF). We explore the possibility to search for this ULSF at the upcoming European Spallation Source neutrino Super-Beam experiment. We have considered the recent study case in which there could be an interaction between the ULSF and active neutrinos. We have found that in this future experimental setup, the sensitivity is competitive with other neutrino physics experiments. We show the expected future sensitivity for the main parameter modeling the interaction between ULSF and neutrinos. |
2404.14677 | Ahmed Hammad | A. Hammad and Mihoko M. Nojiri | Streamlined jet tagging network assisted by jet prong structure | Published version | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Attention-based transformer models have become increasingly prevalent in
collider analysis, offering enhanced performance for tasks such as jet tagging.
However, they are computationally intensive and require substantial data for
training. In this paper, we introduce a new jet classification network using an
MLP mixer, where two subsequent MLP operations serve to transform particle and
feature tokens over the jet constituents. The transformed particles are
combined with subjet information using multi-head cross-attention so that the
network is invariant under the permutation of the jet constituents.
We utilize two clustering algorithms to identify subjets: the standard
sequential recombination algorithms with fixed radius parameters and a new
IRC-safe, density-based algorithm of dynamic radii based on HDBSCAN. The
proposed network demonstrates comparable classification performance to
state-of-the-art models while boosting computational efficiency drastically.
Finally, we evaluate the network performance using various interpretable
methods, including centred kernel alignment and attention maps, to highlight
network efficacy in collider analysis tasks.
| [
{
"created": "Tue, 23 Apr 2024 02:05:18 GMT",
"version": "v1"
},
{
"created": "Tue, 7 May 2024 02:37:48 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Jun 2024 07:28:05 GMT",
"version": "v3"
}
] | 2024-06-04 | [
[
"Hammad",
"A.",
""
],
[
"Nojiri",
"Mihoko M.",
""
]
] | Attention-based transformer models have become increasingly prevalent in collider analysis, offering enhanced performance for tasks such as jet tagging. However, they are computationally intensive and require substantial data for training. In this paper, we introduce a new jet classification network using an MLP mixer, where two subsequent MLP operations serve to transform particle and feature tokens over the jet constituents. The transformed particles are combined with subjet information using multi-head cross-attention so that the network is invariant under the permutation of the jet constituents. We utilize two clustering algorithms to identify subjets: the standard sequential recombination algorithms with fixed radius parameters and a new IRC-safe, density-based algorithm of dynamic radii based on HDBSCAN. The proposed network demonstrates comparable classification performance to state-of-the-art models while boosting computational efficiency drastically. Finally, we evaluate the network performance using various interpretable methods, including centred kernel alignment and attention maps, to highlight network efficacy in collider analysis tasks. |
1301.4652 | Tho Hue Le | L. T. Hue, D. T. Huong and H. N. Long | Lepton flavor violating processes \tau ->\mu\gamma$, $\tau-> 3\mu$ and
$Z-> \mu\tau$ in the Supersymmetric economical 3-3-1 model | $B/\mu$-type parameters are included to guarantee the vacuum
stability condition as well as satisfy current electroweak precision test.
Mass parameter of gaugino in numerical investigation is shifted to be larger
than 300 GeV. Few conclusions are changed. New references are added. This
version was accepted by Nuclear Physics B | Nucl.Phys.B 873 (2013) 207-247 | 10.1016/j.nuclphysb.2013.04.014 | null | hep-ph | http://creativecommons.org/licenses/publicdomain/ | In this work, we study the charged lepton flavor violating (cLFV) decays
$\tau-> \mu\gamma$, $\tau-> 3\mu$ and $Z->\mu\tau$ in the framework of the
Supersymmetric economical 3-3-1 model. Analytic formulas for branching ratios
(BR) of these decays are presented. We assume that there exist lepton flavor
violation (LFV) sources in both right- and left-handed slepton sectors. This
leads to the strong enhancement of cLFV decay rates. We also show that the
effects of the LFV source to the cLFV decay rates in the left-handed slepton
sector are greater than those in the right- handed slepton sector. By numerical
investigation, we show that the model under consideration contains the relative
light mass spectrum of sleptons which satisfies the current experimental bounds
on LFV processes in the limit of small $\tan \gamma$. The interplay between
monopole and dipole operators also was studied.
| [
{
"created": "Sun, 20 Jan 2013 11:24:23 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Jan 2013 03:14:49 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Apr 2013 09:16:51 GMT",
"version": "v3"
}
] | 2013-05-06 | [
[
"Hue",
"L. T.",
""
],
[
"Huong",
"D. T.",
""
],
[
"Long",
"H. N.",
""
]
] | In this work, we study the charged lepton flavor violating (cLFV) decays $\tau-> \mu\gamma$, $\tau-> 3\mu$ and $Z->\mu\tau$ in the framework of the Supersymmetric economical 3-3-1 model. Analytic formulas for branching ratios (BR) of these decays are presented. We assume that there exist lepton flavor violation (LFV) sources in both right- and left-handed slepton sectors. This leads to the strong enhancement of cLFV decay rates. We also show that the effects of the LFV source to the cLFV decay rates in the left-handed slepton sector are greater than those in the right- handed slepton sector. By numerical investigation, we show that the model under consideration contains the relative light mass spectrum of sleptons which satisfies the current experimental bounds on LFV processes in the limit of small $\tan \gamma$. The interplay between monopole and dipole operators also was studied. |
hep-ph/0004204 | Mohan | Mohan Narayan and S. Uma Sankar (Department of Physics, I.I.T. Bombay,
India) | Matter effects for `just so' oscillations | 11 pages including one figure | null | null | null | hep-ph | null | We study the effect of the matter term on the evolution of the solar
neutrinos when the neutrino parameters are those of the `just-so' case. The
extreme non-adiabatic effects at the edge of the sun reduce the expression for
the survival probability in the just-so case to that of the vacuum case. This
conclusion is independent of the width of the extreme non-adiabatic region,
which is a function of the density profile of the sun beyond $r > 0.9 R_s$.
However, in its propagation, neutrino encounters regions of moderate
(non-extreme) non-adiabticity. Neutrino traversal through these regions give
corrections to the survival probability which are profile dependent.
| [
{
"created": "Fri, 21 Apr 2000 13:49:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Narayan",
"Mohan",
"",
"Department of Physics, I.I.T. Bombay,\n India"
],
[
"Sankar",
"S. Uma",
"",
"Department of Physics, I.I.T. Bombay,\n India"
]
] | We study the effect of the matter term on the evolution of the solar neutrinos when the neutrino parameters are those of the `just-so' case. The extreme non-adiabatic effects at the edge of the sun reduce the expression for the survival probability in the just-so case to that of the vacuum case. This conclusion is independent of the width of the extreme non-adiabatic region, which is a function of the density profile of the sun beyond $r > 0.9 R_s$. However, in its propagation, neutrino encounters regions of moderate (non-extreme) non-adiabticity. Neutrino traversal through these regions give corrections to the survival probability which are profile dependent. |
2406.16463 | Bartosz Fornal | Bartosz Fornal, Dyori Polynice, Luka Thompson | Probing the Neutrino Seesaw Scale with Gravitational Waves | 9 pages, 6 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Neutrinos are the most elusive particles of the Standard Model. The physics
behind their masses remains unknown and requires introducing new particles and
interactions. An elegant solution to this problem is provided by the seesaw
mechanism. Typically considered at a high scale, it is potentially testable in
gravitational wave experiments by searching for a spectrum from cosmic strings,
which offers a rather generic signature across many high-scale seesaw models.
Here we consider the possibility of a low-scale seesaw mechanism at the PeV
scale, generating neutrino masses within the framework of a model with gauged
U(1) lepton number. In this case, the gravitational wave signal at high
frequencies arises from a first order phase transition in the early Universe,
whereas at low frequencies it is generated by domain wall annihilation, leading
to a double-peaked structure in the gravitational wave spectrum. The signals
discussed here can be searched for in upcoming experiments, including
gravitational wave interferometers, pulsar timing arrays, and astrometry
observations.
| [
{
"created": "Mon, 24 Jun 2024 09:09:09 GMT",
"version": "v1"
}
] | 2024-06-25 | [
[
"Fornal",
"Bartosz",
""
],
[
"Polynice",
"Dyori",
""
],
[
"Thompson",
"Luka",
""
]
] | Neutrinos are the most elusive particles of the Standard Model. The physics behind their masses remains unknown and requires introducing new particles and interactions. An elegant solution to this problem is provided by the seesaw mechanism. Typically considered at a high scale, it is potentially testable in gravitational wave experiments by searching for a spectrum from cosmic strings, which offers a rather generic signature across many high-scale seesaw models. Here we consider the possibility of a low-scale seesaw mechanism at the PeV scale, generating neutrino masses within the framework of a model with gauged U(1) lepton number. In this case, the gravitational wave signal at high frequencies arises from a first order phase transition in the early Universe, whereas at low frequencies it is generated by domain wall annihilation, leading to a double-peaked structure in the gravitational wave spectrum. The signals discussed here can be searched for in upcoming experiments, including gravitational wave interferometers, pulsar timing arrays, and astrometry observations. |
hep-ph/9811434 | Stefan Dittmaier | Stefan Dittmaier | Radiative corrections to W-pair production in e+e- annihilation | 16 pages, latex, 4 postscript figures, contribution to the
proceedings of "IVth International Symposium on Radiative Corrections, RADCOR
98", September 1998, Barcelona, Spain | null | null | CERN-TH/98-336 | hep-ph | null | The status of precision calculations for the processes e+e- --> WW --> 4
fermions is reviewed, paying particular attention to questions of gauge
invariance and recent progress concerning photonic radiative corrections.
| [
{
"created": "Mon, 23 Nov 1998 10:06:54 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dittmaier",
"Stefan",
""
]
] | The status of precision calculations for the processes e+e- --> WW --> 4 fermions is reviewed, paying particular attention to questions of gauge invariance and recent progress concerning photonic radiative corrections. |
hep-ph/9903474 | Werner Porod | L. Navarro (Uni. Valencia), W. Porod (Uni. Vienna), and J.W.F. Valle
(Uni. Valencia) | Top-Quark Phenomenology in Models with Bilinearly and Spontaneously
Broken R-parity | 12 pages, 6 eps-figures | Phys.Lett.B459:615-624,1999 | 10.1016/S0370-2693(99)00728-5 | FTUV/99-16, IFIC/99-17, UWThPh-1999-18 | hep-ph hep-ex | null | We study unconventional decays of the top-quark in the framework of SUSY
models with spontaneously broken R-parity. In particular we discuss an
effective theory which consists of the MSSM plus bilinearly broken R-parity. We
demonstrate that the decay modes t -> stau + b and t -> tau + sbottom can have
large branching ratios even in scenarios where the tau-neutrino mass is very
small. We show that existing Tevatron data already probe the theoretical
parameters, with promising prospects for further improvement at the Run 2 of
the Tevatron.
| [
{
"created": "Wed, 24 Mar 1999 18:05:12 GMT",
"version": "v1"
}
] | 2009-09-17 | [
[
"Navarro",
"L.",
"",
"Uni. Valencia"
],
[
"Porod",
"W.",
"",
"Uni. Vienna"
],
[
"Valle",
"J. W. F.",
"",
"Uni. Valencia"
]
] | We study unconventional decays of the top-quark in the framework of SUSY models with spontaneously broken R-parity. In particular we discuss an effective theory which consists of the MSSM plus bilinearly broken R-parity. We demonstrate that the decay modes t -> stau + b and t -> tau + sbottom can have large branching ratios even in scenarios where the tau-neutrino mass is very small. We show that existing Tevatron data already probe the theoretical parameters, with promising prospects for further improvement at the Run 2 of the Tevatron. |
hep-ph/9305248 | null | Howard E. Haber | When Are Radiative Corrections Important in the Minimal Supersymmetric
Model? | 52 pages, SCIPP-93/06, phyzzx format (must process twice to get no
TeX errors) | null | null | null | hep-ph | null | Precision electroweak measurements at LEP currently check the validity of the
Standard Model to about one part in a thousand. Any successful model of physics
beyond the Standard Model must be consistent with these observations. The
impact of radiative corrections on the Minimal Supersymmetric Model (MSSM) is
considered. The influence of supersymmetric particles on precision electroweak
measurements is generally negligible since radiative corrections mediated by
supersymmetric particles are suppressed by a factor of order $m_Z^2/M_{\rm
SUSY}^2$ (where $M_{\rm SUSY}$ is the scale characterizing the scale of
supersymmetric particle masses). However, there are a few pertinent exceptions.
For example, the radiative corrections to the rare decay $b\to s\gamma$ from
charged Higgs and supersymmetric particle exchange can be of the same order as
the Standard Model contribution. Large radiative corrections also lead to
modifications of MSSM tree-level (natural) relations. The largest corrections
of this type occur in the MSSM Higgs sector and are enhanced by powers of the
top quark mass. The consequences of the radiatively corrected MSSM Higgs sector
are briefly discussed.
| [
{
"created": "Wed, 12 May 1993 02:18:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Haber",
"Howard E.",
""
]
] | Precision electroweak measurements at LEP currently check the validity of the Standard Model to about one part in a thousand. Any successful model of physics beyond the Standard Model must be consistent with these observations. The impact of radiative corrections on the Minimal Supersymmetric Model (MSSM) is considered. The influence of supersymmetric particles on precision electroweak measurements is generally negligible since radiative corrections mediated by supersymmetric particles are suppressed by a factor of order $m_Z^2/M_{\rm SUSY}^2$ (where $M_{\rm SUSY}$ is the scale characterizing the scale of supersymmetric particle masses). However, there are a few pertinent exceptions. For example, the radiative corrections to the rare decay $b\to s\gamma$ from charged Higgs and supersymmetric particle exchange can be of the same order as the Standard Model contribution. Large radiative corrections also lead to modifications of MSSM tree-level (natural) relations. The largest corrections of this type occur in the MSSM Higgs sector and are enhanced by powers of the top quark mass. The consequences of the radiatively corrected MSSM Higgs sector are briefly discussed. |
1203.1916 | Emil Avsar | Emil Avsar | TMD factorization and the gluon distribution in high energy QCD | 80 pages v2: Few typos corrected, and references added | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is a part of a series of works where we in detail examine the
concept of Transverse Momentum Dependent (TMD), or k_T, factorization, which is
frequently encountered in the literature and is widely used in the
phenomenological applications of QCD at very high energies. We address the
question of what exactly factorization is, as it is meant in different contexts
and formalisms, and we compare the formalisms to each other. We clarify some
basic concepts regarding factorization and how it exactly is applied in high
energy QCD, and we make important notes on some key and fundamental points that
are often overlooked. We offer an extensive analysis of single inclusive
particle production, and we analyze the TMD gluon distribution that plays a
pivotal role in high energy QCD.
| [
{
"created": "Thu, 8 Mar 2012 20:48:27 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Apr 2012 17:44:08 GMT",
"version": "v2"
}
] | 2012-04-03 | [
[
"Avsar",
"Emil",
""
]
] | This paper is a part of a series of works where we in detail examine the concept of Transverse Momentum Dependent (TMD), or k_T, factorization, which is frequently encountered in the literature and is widely used in the phenomenological applications of QCD at very high energies. We address the question of what exactly factorization is, as it is meant in different contexts and formalisms, and we compare the formalisms to each other. We clarify some basic concepts regarding factorization and how it exactly is applied in high energy QCD, and we make important notes on some key and fundamental points that are often overlooked. We offer an extensive analysis of single inclusive particle production, and we analyze the TMD gluon distribution that plays a pivotal role in high energy QCD. |
1702.05727 | Mahdi Radin | M. Radin | Charmonium Mass Spectrum with Spin-Dependent Interaction in
Momentum-Helicity Space | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we have solved the nonrelativistic form of the
Lippmann-Schwinger equation in the momentum-helicity space by inserting a
spin-dependent quark-antiquark potential model numerically. To this end, we
have used the momentum-helicity basis states for describing a nonrelativistic
reduction of one gluon exchange potential. Then we have calculated the mass
spectrum of the charmonium $\psi(c\bar{c})$, and finally we have compared the
results with the another theoretical results and experimental data.
| [
{
"created": "Sun, 19 Feb 2017 09:29:09 GMT",
"version": "v1"
}
] | 2017-02-21 | [
[
"Radin",
"M.",
""
]
] | In this paper we have solved the nonrelativistic form of the Lippmann-Schwinger equation in the momentum-helicity space by inserting a spin-dependent quark-antiquark potential model numerically. To this end, we have used the momentum-helicity basis states for describing a nonrelativistic reduction of one gluon exchange potential. Then we have calculated the mass spectrum of the charmonium $\psi(c\bar{c})$, and finally we have compared the results with the another theoretical results and experimental data. |
hep-ph/9908294 | Saswati Sarkar | Asim K. Ray and Saswati Sarkar (Visva Bharati University, INDIA) | An $SU(2)_{L}\times U(1)_{Y} \times S_{3} \times D$ model for
atmospheric and solar neutrino deficits | null | Phys.Rev. D61 (2000) 035007 | 10.1103/PhysRevD.61.035007 | null | hep-ph | null | Motivated by the recent Super-Kamiokande experiment on atmospheric and solar
neutrino oscillation we propose a see-saw model of three generations of
neutrinos based on the gauge group $SU(2)_{L}\times U(1)_{Y}$ with discrete
symmetries $(S_{3} \times D)$ and three right handed singlet neutrinos so that
this model can accommodate the recent Super-Kamiokande data on atmospheric and
solar neutrino oscillations. The model predicts maximal mixing between
$\nu_{\mu}$ and $\nu_{\tau}$ with $sin^{2}2{\theta_{\mu\tau}}$ = 1 as required
by the atmospheric neutrino data and small mixing between $\nu_{e}$ and
$\nu_{\mu}$ with $sin^{2}2{\theta_{e\mu}} \sim (10^{-2}-10^{-3})$ as a possible
explanation of the solar neutrino deficit through the MSW mechanism. The model
admits two mass scales of which one breaks the electroweak symmetry and the
other is responsible for the breaking of the lepton number symmetry at GUT
scale leading to small Majorana mass of the left handed doublet neutrinos.
| [
{
"created": "Sat, 7 Aug 1999 11:06:50 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Sep 1999 07:44:00 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Ray",
"Asim K.",
"",
"Visva Bharati University, INDIA"
],
[
"Sarkar",
"Saswati",
"",
"Visva Bharati University, INDIA"
]
] | Motivated by the recent Super-Kamiokande experiment on atmospheric and solar neutrino oscillation we propose a see-saw model of three generations of neutrinos based on the gauge group $SU(2)_{L}\times U(1)_{Y}$ with discrete symmetries $(S_{3} \times D)$ and three right handed singlet neutrinos so that this model can accommodate the recent Super-Kamiokande data on atmospheric and solar neutrino oscillations. The model predicts maximal mixing between $\nu_{\mu}$ and $\nu_{\tau}$ with $sin^{2}2{\theta_{\mu\tau}}$ = 1 as required by the atmospheric neutrino data and small mixing between $\nu_{e}$ and $\nu_{\mu}$ with $sin^{2}2{\theta_{e\mu}} \sim (10^{-2}-10^{-3})$ as a possible explanation of the solar neutrino deficit through the MSW mechanism. The model admits two mass scales of which one breaks the electroweak symmetry and the other is responsible for the breaking of the lepton number symmetry at GUT scale leading to small Majorana mass of the left handed doublet neutrinos. |
0712.2514 | Andrei Kataev | A.L. Kataev (INR, Moscow) and V.T. Kim (NPI, Gatchina) | Higgs Decay To \bar{b}b: Different Approaches To Resummation Of QCD
Effects | 4 pages, 2 figures, submitted tio the Proceedings of 13 Lomonosov
Conference on Elementary Particle Physics, Moscow State University, August
23-29, 2007, 1 reference corrected | null | null | null | hep-ph | null | The comparison between parameterisations of the perturbation results for the
decay width of the Standard Model Higgs boson to \bar{b}b-quarks pairs, based
on application of \bar{MS}-scheme running quark mass and pole b-quark mass, are
presented. In the case of the latter parameterisation taking into account of
order O(\alpha_s^3) term is rather important. It is minimising deviations of
the results obtained at the O(\alpha_s^2) level from the results, which follow
from the running quark mass approach
| [
{
"created": "Sat, 15 Dec 2007 13:58:53 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Dec 2007 18:49:09 GMT",
"version": "v2"
}
] | 2007-12-23 | [
[
"Kataev",
"A. L.",
"",
"INR, Moscow"
],
[
"Kim",
"V. T.",
"",
"NPI, Gatchina"
]
] | The comparison between parameterisations of the perturbation results for the decay width of the Standard Model Higgs boson to \bar{b}b-quarks pairs, based on application of \bar{MS}-scheme running quark mass and pole b-quark mass, are presented. In the case of the latter parameterisation taking into account of order O(\alpha_s^3) term is rather important. It is minimising deviations of the results obtained at the O(\alpha_s^2) level from the results, which follow from the running quark mass approach |
0802.1486 | Alexey Gulov | A. N. Buryk, V. V. Skalozub | Neural network predictions for Z' boson within LEP2 data set of Bhabha
process | 12 pages, 6 figures; results of all the LEP2 collaborations were
analysed | null | null | null | hep-ph | http://creativecommons.org/licenses/by/3.0/ | The neural network approach is applied to search for the Z'-boson within the
LEP2 data set for e+ e- -> e+ e- scattering process. In the course of the
analysis, the data set is reduced by 20 percent. The axial-vector and vector
couplings of the Z' are estimated at 95 percent CL within a two-parameter fit.
The mass is determined to be 0.53-1.05 TeV. Comparisons with other results are
given.
| [
{
"created": "Mon, 11 Feb 2008 17:53:11 GMT",
"version": "v1"
},
{
"created": "Fri, 15 May 2009 16:09:06 GMT",
"version": "v2"
}
] | 2009-05-15 | [
[
"Buryk",
"A. N.",
""
],
[
"Skalozub",
"V. V.",
""
]
] | The neural network approach is applied to search for the Z'-boson within the LEP2 data set for e+ e- -> e+ e- scattering process. In the course of the analysis, the data set is reduced by 20 percent. The axial-vector and vector couplings of the Z' are estimated at 95 percent CL within a two-parameter fit. The mass is determined to be 0.53-1.05 TeV. Comparisons with other results are given. |
hep-ph/0603164 | Olga Lakhina | O. Lakhina, E. S. Swanson (U. Pittsburgh) | Dynamic Properties of Charmonium | 22 pages, 22 ps figures (table entries corrected, text modified) | Phys.Rev.D74:014012,2006 | 10.1103/PhysRevD.74.014012 | null | hep-ph | null | Nonrelativistic quark models of charmonia are tested by comparison of
theoretical charmonium decay constants, form factors, and $\gamma\gamma$ widths
with experiment and lattice gauge computations. The importance of relativistic
effects, a running coupling, and the correct implementation of bound state
effects are demonstrated. We describe how an improved model and computational
techniques resolve several outstanding issues in previous nonrelativistic quark
models such as the use of `correction' factors in quark model form factors,
artificial energy prescriptions in decay constant calculations, and ad hoc
phase space modifications. We comment on the small experimental value of
$f_{\psi''}$ and the D-wave component of the $J/\psi$. Decay constants and
$\gamma\gamma$ widths for bottomonium are also presented.
| [
{
"created": "Tue, 21 Mar 2006 17:45:04 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Mar 2006 19:26:41 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Lakhina",
"O.",
"",
"U. Pittsburgh"
],
[
"Swanson",
"E. S.",
"",
"U. Pittsburgh"
]
] | Nonrelativistic quark models of charmonia are tested by comparison of theoretical charmonium decay constants, form factors, and $\gamma\gamma$ widths with experiment and lattice gauge computations. The importance of relativistic effects, a running coupling, and the correct implementation of bound state effects are demonstrated. We describe how an improved model and computational techniques resolve several outstanding issues in previous nonrelativistic quark models such as the use of `correction' factors in quark model form factors, artificial energy prescriptions in decay constant calculations, and ad hoc phase space modifications. We comment on the small experimental value of $f_{\psi''}$ and the D-wave component of the $J/\psi$. Decay constants and $\gamma\gamma$ widths for bottomonium are also presented. |
hep-ph/9604297 | Maksim L. Nekrasov | M. L. Nekrasov (IHEP, Protvino) | Pseudoscalar Glueball, eta'-meson and its Excitation in the Chiral
Effective Lagrangian | 19 pages LaTeX, no figures. Revised version accepted in Phis.Rev.D | Phys.Rev. D56 (1997) 5681-5691 | 10.1103/PhysRevD.56.5681 | null | hep-ph | null | A generalization of the chiral effective lagrangian of order $p^2$ is
proposed which involves the $\eta'$-meson, its excitation, and the pseudoscalar
(PS) glueball. Model-independent constraints are found for the contributions to
the lagrangian of the above singlet states. Those allow one to independently
identify the nature of these singlet states in the framework of the approach.
The mixing among the iso-singlet states (including $\eta^8$-state) is analysed,
and the hierarchy of the mixing angles is described which is defined by the
chiral and large-$N_c$ expansions. The recent PCAC results are reproduced,
which are related to the problem of the renormalization-group invariant
description of the $\eta'$ and the PS glueball, and a further analysis of this
problem is performed.
| [
{
"created": "Thu, 11 Apr 1996 19:52:48 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Jul 1997 10:24:39 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Nekrasov",
"M. L.",
"",
"IHEP, Protvino"
]
] | A generalization of the chiral effective lagrangian of order $p^2$ is proposed which involves the $\eta'$-meson, its excitation, and the pseudoscalar (PS) glueball. Model-independent constraints are found for the contributions to the lagrangian of the above singlet states. Those allow one to independently identify the nature of these singlet states in the framework of the approach. The mixing among the iso-singlet states (including $\eta^8$-state) is analysed, and the hierarchy of the mixing angles is described which is defined by the chiral and large-$N_c$ expansions. The recent PCAC results are reproduced, which are related to the problem of the renormalization-group invariant description of the $\eta'$ and the PS glueball, and a further analysis of this problem is performed. |
2212.08025 | Rahool Kumar Barman | K. S. Babu, Rahool Kumar Barman, Dorival Gon\c{c}alves and Ahmed
Ismail | Probing Lepton Number Violation and Majorana Nature of Neutrinos at the
LHC | 10 pages, 8 figures, and 1 table | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Observation of lepton number ($L$) violation by two units at colliders would
provide evidence for the Majorana nature of neutrinos. We study signals of
$L$-violation in the context of two popular models of neutrino masses, the
type-II seesaw model and the Zee model, wherein small neutrino masses arise at
the tree-level and one-loop level, respectively. We focus on $L$-violation
signals at the LHC arising through the process $pp \to \ell^{\pm}\ell^{\prime
\pm}$ + jets within these frameworks. We obtain sensitivity to $L$-violation in
the type-II seesaw model for triplet scalar masses up to 700 GeV and in the Zee
model for charged scalar masses up to 4.8 TeV at the high-luminosity LHC with
an integrated luminosity of $3~\text{ab}^{-1}$.
| [
{
"created": "Thu, 15 Dec 2022 18:34:04 GMT",
"version": "v1"
}
] | 2022-12-16 | [
[
"Babu",
"K. S.",
""
],
[
"Barman",
"Rahool Kumar",
""
],
[
"Gonçalves",
"Dorival",
""
],
[
"Ismail",
"Ahmed",
""
]
] | Observation of lepton number ($L$) violation by two units at colliders would provide evidence for the Majorana nature of neutrinos. We study signals of $L$-violation in the context of two popular models of neutrino masses, the type-II seesaw model and the Zee model, wherein small neutrino masses arise at the tree-level and one-loop level, respectively. We focus on $L$-violation signals at the LHC arising through the process $pp \to \ell^{\pm}\ell^{\prime \pm}$ + jets within these frameworks. We obtain sensitivity to $L$-violation in the type-II seesaw model for triplet scalar masses up to 700 GeV and in the Zee model for charged scalar masses up to 4.8 TeV at the high-luminosity LHC with an integrated luminosity of $3~\text{ab}^{-1}$. |
0905.2483 | Atsushi Watanabe | Raj Gandhi, Abhijit Samanta, Atsushi Watanabe | The Role and Detectability of the Charm Contribution to Ultra High
Energy Neutrino Fluxes | 13 pages, 5 figures; (ver. 2) accepted in JCAP | JCAP 0909:015,2009 | 10.1088/1475-7516/2009/09/015 | KYUSHU-HET-118 | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is widely believed that charm meson production and decay may play an
important role in high energy astrophysical sources of neutrinos, especially
those that are baryon-rich, providing an environment conducive to pp
interactions. Using slow-jet supernovae (SJS) as an example of such a source,
we study the detectability of high-energy neutrinos, paying particular
attention to those produced from charmed-mesons. We highlight important
distinguishing features in the ultra-high energy neutrino flux which would act
as markers for the role of charm in the source. In particular, charm leads to
significant event rates at higher energies, after the conventional (pi, K)
neutrino fluxes fall off. We calculate event rates both for a nearby single
source and for diffuse SJS fluxes for an IceCube-like detector. By comparing
muon event rates for the conventional and prompt fluxes in different energy
bins, we demonstrate the striking energy dependence in the rates induced by the
presence of charm. We also show that it leads to an energy dependant flux ratio
of shower to muon events, providing an additional important diagnostic tool for
the presence of prompt neutrinos. Motivated by the infusion of high energy
anti-electron neutrinos into the flux by charm decay, we also study the
detectability of the Glashow resonance due to these sources.
| [
{
"created": "Fri, 15 May 2009 07:16:44 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Aug 2009 02:42:36 GMT",
"version": "v2"
}
] | 2009-09-28 | [
[
"Gandhi",
"Raj",
""
],
[
"Samanta",
"Abhijit",
""
],
[
"Watanabe",
"Atsushi",
""
]
] | It is widely believed that charm meson production and decay may play an important role in high energy astrophysical sources of neutrinos, especially those that are baryon-rich, providing an environment conducive to pp interactions. Using slow-jet supernovae (SJS) as an example of such a source, we study the detectability of high-energy neutrinos, paying particular attention to those produced from charmed-mesons. We highlight important distinguishing features in the ultra-high energy neutrino flux which would act as markers for the role of charm in the source. In particular, charm leads to significant event rates at higher energies, after the conventional (pi, K) neutrino fluxes fall off. We calculate event rates both for a nearby single source and for diffuse SJS fluxes for an IceCube-like detector. By comparing muon event rates for the conventional and prompt fluxes in different energy bins, we demonstrate the striking energy dependence in the rates induced by the presence of charm. We also show that it leads to an energy dependant flux ratio of shower to muon events, providing an additional important diagnostic tool for the presence of prompt neutrinos. Motivated by the infusion of high energy anti-electron neutrinos into the flux by charm decay, we also study the detectability of the Glashow resonance due to these sources. |
1904.00238 | Jan Heisig | Mathias Garny, Jan Heisig, Marco Hufnagel, Benedikt L\"ulf, Stefan
Vogl | Conversion-driven freeze-out: Dark matter genesis beyond the WIMP
paradigm | Contribution to the proceedings of the Corfu Summer Institute 2018; 8
pages + references, 4 figures | null | null | TUM-HEP-1195/19, CP3-19-14, DESY 19-064, TTK-19-13 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider dark matter (DM) with very weak couplings to the standard model
(SM), such that its self-annihilation cross section is much smaller than the
canonical one, $\langle\sigma v\rangle_{\chi\chi} \ll
10^{-26}\mathrm{cm}^3/\mathrm{s}$. In this case DM self-annihilation is
negligible for the dynamics of freeze-out and DM dilution is solely driven by
efficient annihilation of heavier accompanying dark sector particles provided
that DM maintains chemical equilibrium with the dark sector. This chemical
equilibrium is established by conversion processes which require much smaller
couplings to be efficient than annihilation. The chemical decoupling of DM from
the SM can either be initiated by the freeze-out of annihilation, resembling a
co-annihilation scenario, or of conversion processes, leading to the scenario
of conversion-driven freeze-out. We focus on the latter and discuss its
distinct phenomenology.
| [
{
"created": "Sat, 30 Mar 2019 16:05:23 GMT",
"version": "v1"
}
] | 2019-04-18 | [
[
"Garny",
"Mathias",
""
],
[
"Heisig",
"Jan",
""
],
[
"Hufnagel",
"Marco",
""
],
[
"Lülf",
"Benedikt",
""
],
[
"Vogl",
"Stefan",
""
]
] | We consider dark matter (DM) with very weak couplings to the standard model (SM), such that its self-annihilation cross section is much smaller than the canonical one, $\langle\sigma v\rangle_{\chi\chi} \ll 10^{-26}\mathrm{cm}^3/\mathrm{s}$. In this case DM self-annihilation is negligible for the dynamics of freeze-out and DM dilution is solely driven by efficient annihilation of heavier accompanying dark sector particles provided that DM maintains chemical equilibrium with the dark sector. This chemical equilibrium is established by conversion processes which require much smaller couplings to be efficient than annihilation. The chemical decoupling of DM from the SM can either be initiated by the freeze-out of annihilation, resembling a co-annihilation scenario, or of conversion processes, leading to the scenario of conversion-driven freeze-out. We focus on the latter and discuss its distinct phenomenology. |
2305.11138 | Partha Kumar Paul | Satyabrata Mahapatra, Partha Kumar Paul, Narendra Sahu, Prashant
Shukla | Cogenesis of matter and dark matter from triplet fermion seesaw | 32 pages, 19 captioned figures | null | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a simple model in the type-III seesaw framework to explain the
neutrino mass, asymmetric dark matter, baryon asymmetry of the Universe, and
the recently reported W-mass anomaly by CDF-II collaboration. We extend the
standard model with a vector-like singlet lepton ($\chi$) and a hypercharge
zero scalar triplet ($\Delta$) in addition to three hypercharge zero triplet
fermions($\Sigma_i~,i=1,2,3$). A $Z_2$ symmetry is imposed under which $\chi$
and $\Delta$ are odd, while all other particles are even. As a result, the
lightest $Z_2$ odd particle $\chi$ behaves as a candidate of dark matter. In
the early Universe, the CP-violating out-of-equilibrium decay of heavy triplet
fermions to the Standard Model lepton ($L$) and Higgs ($H$) generate a net
lepton asymmetry, while that of triplet fermions to $\chi$ and $\Delta$
generate a net asymmetric dark matter. The lepton asymmetry is converted to the
required baryon asymmetry of the Universe via the electroweak sphalerons, while
the asymmetry in $\chi$ remains as a dark matter relic that we observe today.
We introduce a singlet scalar $\phi$, with mass $m_\phi < m_\chi$, which not
only assists to deplete the symmetric component of $\chi$ through the
annihilation process: $\bar{\chi} \chi \to \phi \phi$ but also paves a path to
detect dark matter $\chi$ at direct search experiments through $\phi-H$ mixing.
The $Z_2$ symmetry is broken softly resulting in an unstable asymmetric dark
matter with mass ranging from a few MeV to a few tens of GeV. The softly broken
$Z_2$ symmetry also induces a vacuum expectation value (vev) of $\Delta$ due to
which the asymmetry in $\Delta$ disappears. Moreover, the vev of $\Delta$
enhances the W-boson mass as reported by CDF-II collaboration with $7\sigma$
statistical significance, while keeping the $Z$-boson mass intact.
| [
{
"created": "Thu, 18 May 2023 17:34:05 GMT",
"version": "v1"
},
{
"created": "Mon, 29 May 2023 19:33:39 GMT",
"version": "v2"
}
] | 2023-05-31 | [
[
"Mahapatra",
"Satyabrata",
""
],
[
"Paul",
"Partha Kumar",
""
],
[
"Sahu",
"Narendra",
""
],
[
"Shukla",
"Prashant",
""
]
] | We propose a simple model in the type-III seesaw framework to explain the neutrino mass, asymmetric dark matter, baryon asymmetry of the Universe, and the recently reported W-mass anomaly by CDF-II collaboration. We extend the standard model with a vector-like singlet lepton ($\chi$) and a hypercharge zero scalar triplet ($\Delta$) in addition to three hypercharge zero triplet fermions($\Sigma_i~,i=1,2,3$). A $Z_2$ symmetry is imposed under which $\chi$ and $\Delta$ are odd, while all other particles are even. As a result, the lightest $Z_2$ odd particle $\chi$ behaves as a candidate of dark matter. In the early Universe, the CP-violating out-of-equilibrium decay of heavy triplet fermions to the Standard Model lepton ($L$) and Higgs ($H$) generate a net lepton asymmetry, while that of triplet fermions to $\chi$ and $\Delta$ generate a net asymmetric dark matter. The lepton asymmetry is converted to the required baryon asymmetry of the Universe via the electroweak sphalerons, while the asymmetry in $\chi$ remains as a dark matter relic that we observe today. We introduce a singlet scalar $\phi$, with mass $m_\phi < m_\chi$, which not only assists to deplete the symmetric component of $\chi$ through the annihilation process: $\bar{\chi} \chi \to \phi \phi$ but also paves a path to detect dark matter $\chi$ at direct search experiments through $\phi-H$ mixing. The $Z_2$ symmetry is broken softly resulting in an unstable asymmetric dark matter with mass ranging from a few MeV to a few tens of GeV. The softly broken $Z_2$ symmetry also induces a vacuum expectation value (vev) of $\Delta$ due to which the asymmetry in $\Delta$ disappears. Moreover, the vev of $\Delta$ enhances the W-boson mass as reported by CDF-II collaboration with $7\sigma$ statistical significance, while keeping the $Z$-boson mass intact. |
2008.08119 | Aniello Quaranta | Antonio Capolupo, Salvatore Marco Giampaolo, Aniello Quaranta | Beyond the MSW effect: Neutrinos in a dense medium | 15 pages, 4 figures | Physics Letters B, Volume 820, 136489 (2021) | 10.1016/j.physletb.2021.136489 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by-sa/4.0/ | We present a theory of neutrino oscillations in a dense medium which goes
beyond the effective matter potential used in the description of the MSW
effect. We show how the purity of the neutrino state is degraded by neutrino
interactions with the environment and how neutrino--matter interactions can be
a source of decoherence. We present new oscillation formulae for neutrinos
interacting with leptons and carry out a numerical analysis which exhibits
deviations from the MSW formulae for propagation through the Earth of
ultra-high energy neutrinos. In particular, we show that at high density and/or
high neutrino energy, the vanishing transition probabilities derived for MSW
effect, are non zero when the scattering is taken into account.
| [
{
"created": "Tue, 18 Aug 2020 18:50:41 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jul 2021 09:55:32 GMT",
"version": "v2"
}
] | 2021-07-20 | [
[
"Capolupo",
"Antonio",
""
],
[
"Giampaolo",
"Salvatore Marco",
""
],
[
"Quaranta",
"Aniello",
""
]
] | We present a theory of neutrino oscillations in a dense medium which goes beyond the effective matter potential used in the description of the MSW effect. We show how the purity of the neutrino state is degraded by neutrino interactions with the environment and how neutrino--matter interactions can be a source of decoherence. We present new oscillation formulae for neutrinos interacting with leptons and carry out a numerical analysis which exhibits deviations from the MSW formulae for propagation through the Earth of ultra-high energy neutrinos. In particular, we show that at high density and/or high neutrino energy, the vanishing transition probabilities derived for MSW effect, are non zero when the scattering is taken into account. |
hep-ph/0507327 | Tony Signal | A. I. Signal | g1(x) and g2(x) in the Meson Cloud Model | 4 pages, contribution to DIS 05, Madison, Wisconsin | null | 10.1063/1.2122198 | null | hep-ph nucl-th | null | We calculate the spin dependent structure functions g1(x) and g2(x) of the
proton and neutron. Our calculation uses the meson cloud model of nucleon
structure and includes the effects of kinematic terms which mix transverse and
longitudinal spin components. We find small corrections to the nucleon
structure functions, however these are significant for the neutron.
| [
{
"created": "Thu, 28 Jul 2005 23:23:43 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Signal",
"A. I.",
""
]
] | We calculate the spin dependent structure functions g1(x) and g2(x) of the proton and neutron. Our calculation uses the meson cloud model of nucleon structure and includes the effects of kinematic terms which mix transverse and longitudinal spin components. We find small corrections to the nucleon structure functions, however these are significant for the neutron. |
1601.00939 | Hamzeh Khanpour | Hamzeh Khanpour and S. Atashbar Tehrani | Global analysis of nuclear parton distribution functions and their
uncertainties at next-to-next-to-leading order | 19 Pages, 24 Figures, 3 Tables | Phys. Rev. D 93, 014026 (2016) | 10.1103/PhysRevD.93.014026 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a next-to-next-to-leading order (NNLO) analysis of nuclear parton
distribution functions (nPDFs) using neutral current charged-lepton ($\ell
^\pm$ + nucleus) deeply inelastic scattering (DIS) data and Drell-Yan (DY)
cross-section ratios $\sigma_{DY}^{A}/\sigma_{DY}^{A^\prime}$ for several
nuclear targets. We study in detail the parametrizations and the atomic mass
(A) dependence of the nuclear PDFs at this order. The present nuclear PDFs
global analysis provides us a complete set of nuclear PDFs,
$f_i^{(A,Z)}(x,Q^2)$, with a full functional dependence on $x$, A, Q$^2$. The
uncertainties of the obtained nuclear modification factors for each parton
flavour are estimated using the well-known Hessian method. The nuclear charm
quark distributions are also added into the analysis. We compare the
parametrization results with the available data and the results of other
nuclear PDFs groups. We found our nuclear PDFs to be in reasonably good
agreement with them. The estimates of errors provided by our global analysis
are rather smaller than those of other groups. In general, a very good
agreement is achieved. We also briefly review the recent heavy-ion collisions
data including the first experimental data from the LHC proton+lead and
lead+lead run which can be used in the global fits of nuclear PDFs. We
highlight different aspects of the high luminosity Pb--Pb and p--Pb data which
have been recorded by the CMS Collaboration.
| [
{
"created": "Tue, 5 Jan 2016 19:01:24 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Jan 2016 21:12:41 GMT",
"version": "v2"
}
] | 2016-01-29 | [
[
"Khanpour",
"Hamzeh",
""
],
[
"Tehrani",
"S. Atashbar",
""
]
] | We perform a next-to-next-to-leading order (NNLO) analysis of nuclear parton distribution functions (nPDFs) using neutral current charged-lepton ($\ell ^\pm$ + nucleus) deeply inelastic scattering (DIS) data and Drell-Yan (DY) cross-section ratios $\sigma_{DY}^{A}/\sigma_{DY}^{A^\prime}$ for several nuclear targets. We study in detail the parametrizations and the atomic mass (A) dependence of the nuclear PDFs at this order. The present nuclear PDFs global analysis provides us a complete set of nuclear PDFs, $f_i^{(A,Z)}(x,Q^2)$, with a full functional dependence on $x$, A, Q$^2$. The uncertainties of the obtained nuclear modification factors for each parton flavour are estimated using the well-known Hessian method. The nuclear charm quark distributions are also added into the analysis. We compare the parametrization results with the available data and the results of other nuclear PDFs groups. We found our nuclear PDFs to be in reasonably good agreement with them. The estimates of errors provided by our global analysis are rather smaller than those of other groups. In general, a very good agreement is achieved. We also briefly review the recent heavy-ion collisions data including the first experimental data from the LHC proton+lead and lead+lead run which can be used in the global fits of nuclear PDFs. We highlight different aspects of the high luminosity Pb--Pb and p--Pb data which have been recorded by the CMS Collaboration. |
2211.01040 | Yannick Ulrich | P. Banerjee, A. M. Coutinho, T. Engel, A. Gurgone, A. Signer, Y.
Ulrich | High-precision muon decay predictions for ALP searches | 37 pages, 14 figures, published version | SciPost Phys. 15, 021 (2023) | 10.21468/SciPostPhys.15.1.021 | FR-PHENO-2022-10, IFIC/22-32, IPPP/22/75, PSI-PR-22-32, ZU-TH 50/22 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an improved theoretical prediction of the positron energy spectrum
for the polarised Michel decay $\mu^+\to e^+ \nu_e\bar{\nu}_\mu$. In addition
to the full next-to-next-to-leading order correction of order $\alpha^2$ in the
electromagnetic coupling, we include logarithmically enhanced terms at even
higher orders. Logarithms due to collinear emission are included at
next-to-leading accuracy up to order $\alpha^4$. At the endpoint of the Michel
spectrum, soft photon emission results in large logarithms that are resummed up
to next-to-next-to-leading logarithmic accuracy. We apply our results in the
context of the MEG II and Mu3e experiments to estimate the impact of the theory
error on the branching ratio sensitivity for the lepton-flavour-violating decay
$\mu^+\to e^+ X$ of a muon into an axion-like particle $X$.
| [
{
"created": "Wed, 2 Nov 2022 11:14:07 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Jul 2023 14:03:00 GMT",
"version": "v2"
}
] | 2023-07-25 | [
[
"Banerjee",
"P.",
""
],
[
"Coutinho",
"A. M.",
""
],
[
"Engel",
"T.",
""
],
[
"Gurgone",
"A.",
""
],
[
"Signer",
"A.",
""
],
[
"Ulrich",
"Y.",
""
]
] | We present an improved theoretical prediction of the positron energy spectrum for the polarised Michel decay $\mu^+\to e^+ \nu_e\bar{\nu}_\mu$. In addition to the full next-to-next-to-leading order correction of order $\alpha^2$ in the electromagnetic coupling, we include logarithmically enhanced terms at even higher orders. Logarithms due to collinear emission are included at next-to-leading accuracy up to order $\alpha^4$. At the endpoint of the Michel spectrum, soft photon emission results in large logarithms that are resummed up to next-to-next-to-leading logarithmic accuracy. We apply our results in the context of the MEG II and Mu3e experiments to estimate the impact of the theory error on the branching ratio sensitivity for the lepton-flavour-violating decay $\mu^+\to e^+ X$ of a muon into an axion-like particle $X$. |
2402.17534 | Nahuel Barrios | Nahuel Barrios, Marcelo S. Guimaraes, Bruno W. Mintz, Let\'icia F.
Palhares and Marcela Pel\'aez | Ghost-gluon vertex in the presence of the Gribov horizon: General
kinematics | 24 pages, 12 figures | Phys. Rev. D 109, 094039 (2024) | 10.1103/PhysRevD.109.094039 | null | hep-ph hep-lat hep-th | http://creativecommons.org/licenses/by/4.0/ | Correlation functions are important probes for the behavior of quantum field
theories. Already at tree-level, the Refined Gribov Zwanziger (RGZ) effective
action for Yang-Mills theories provides a good approximation for the gluon
propagator, as compared to that calculated by nonperturbative methods such as
Lattice Field Theory and Dyson-Schwinger Equations. However, the study of
higher correlation functions of the RGZ theory is still at its beginning. In
this work we evaluate the ghost-antighost-gluon vertex function in Landau gauge
at one-loop level, in $d=4$ space-time dimensions for the gauge groups SU(2)
and SU(3). More precisely, we extend the analysis conducted in [1] for the
soft-gluon limit to an arbitrary kinematic configuration. We introduce
renormalization group effects by means of a toy model for the running coupling
and investigate the impact of such a model in the ultraviolet tails of our
results. We find that RGZ results match fairly closely those from lattice
simulations, Schwinger-Dyson equations and the Curci-Ferrari model for three
different kinematic configurations. This is compatible with RGZ being a
feasible theory for the strong interaction in the infrared regime.
| [
{
"created": "Tue, 27 Feb 2024 14:21:32 GMT",
"version": "v1"
},
{
"created": "Sat, 25 May 2024 22:41:14 GMT",
"version": "v2"
}
] | 2024-05-28 | [
[
"Barrios",
"Nahuel",
""
],
[
"Guimaraes",
"Marcelo S.",
""
],
[
"Mintz",
"Bruno W.",
""
],
[
"Palhares",
"Letícia F.",
""
],
[
"Peláez",
"Marcela",
""
]
] | Correlation functions are important probes for the behavior of quantum field theories. Already at tree-level, the Refined Gribov Zwanziger (RGZ) effective action for Yang-Mills theories provides a good approximation for the gluon propagator, as compared to that calculated by nonperturbative methods such as Lattice Field Theory and Dyson-Schwinger Equations. However, the study of higher correlation functions of the RGZ theory is still at its beginning. In this work we evaluate the ghost-antighost-gluon vertex function in Landau gauge at one-loop level, in $d=4$ space-time dimensions for the gauge groups SU(2) and SU(3). More precisely, we extend the analysis conducted in [1] for the soft-gluon limit to an arbitrary kinematic configuration. We introduce renormalization group effects by means of a toy model for the running coupling and investigate the impact of such a model in the ultraviolet tails of our results. We find that RGZ results match fairly closely those from lattice simulations, Schwinger-Dyson equations and the Curci-Ferrari model for three different kinematic configurations. This is compatible with RGZ being a feasible theory for the strong interaction in the infrared regime. |
hep-ph/9610333 | Ahmed Ali | A. Ali (DESY, Hamburg) | Rare B Decays in the Standard Model | Latex2e, 25 pages, 4 figures (require epsf.sty, rotate). Invited
talk. To be published in Proceedings of the 4th International Workshop
'Beauty-96', Roma, June 17 - 21, 1996 | Nucl.Instrum.Meth. A384 (1996) 8-16 | 10.1016/S0168-9002(96)00908-4 | null | hep-ph | null | We discuss the electromagnetic-penguin-dominated radiative B decays $B \to
X_s + \gamma, ~B^{\pm (0)} \to K^{*\pm (0)} + \gamma$, and $B_s \to \phi +
\gamma$ in the context of the standard model (SM) and their
Cabibbo-Kobayashi-Maskawa (CKM)-suppressed counterparts, $B \to X_d + \gamma$,
$B^\pm \to \rho^\pm + \gamma, ~B^{0} \to (\rho^{0}, \omega) + \gamma$, and $B_s
\to K^{* 0} + \gamma$, using QCD sum rules for the exclusive decays. The
importance of these decays in determining the parameters of the CKM matrix is
emphasized. The semileptonic decays $B \to X_s \ell^+ \ell^-$ are also
discussed in the context of the SM and their role in determining the Wilson
coefficients of the effective theory is stressed. Comparison with the existing
measurements are made and SM-based predictions for a large number of rare B
decays are presented.
| [
{
"created": "Fri, 11 Oct 1996 15:44:33 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Ali",
"A.",
"",
"DESY, Hamburg"
]
] | We discuss the electromagnetic-penguin-dominated radiative B decays $B \to X_s + \gamma, ~B^{\pm (0)} \to K^{*\pm (0)} + \gamma$, and $B_s \to \phi + \gamma$ in the context of the standard model (SM) and their Cabibbo-Kobayashi-Maskawa (CKM)-suppressed counterparts, $B \to X_d + \gamma$, $B^\pm \to \rho^\pm + \gamma, ~B^{0} \to (\rho^{0}, \omega) + \gamma$, and $B_s \to K^{* 0} + \gamma$, using QCD sum rules for the exclusive decays. The importance of these decays in determining the parameters of the CKM matrix is emphasized. The semileptonic decays $B \to X_s \ell^+ \ell^-$ are also discussed in the context of the SM and their role in determining the Wilson coefficients of the effective theory is stressed. Comparison with the existing measurements are made and SM-based predictions for a large number of rare B decays are presented. |
hep-ph/0501162 | Gilberto Tavares-Velasco | U. Cotti, M. Pineda, G. Tavares-Velasco | Lepton flavor violating Higgs boson decay H --> mu tau at muon colliders | 10 pages, 6 figures | null | null | null | hep-ph | null | We consider an effective nondiagonal coupling $H\bar{\mu}\tau$ and present
the analysis of the Higgs boson mediated lepton-flavor violating (LFV) reaction
$\mu^-\mu^+ --> \mu \tau$. For a Higgs boson mass around 115 GeV and convenient
values of the strength of the coupling $H\bar{\mu}\tau$, which are within the
bounds obtained from the experimental limits on the LFV decays $\tau-->\eta\mu$
and $\tau-->\mu\gamma$, we found that there would be up to a few hundreds of
$\mu \tau$ events per year at a muon collider running with an integrated
luminosity of $1 fb^{-1}$. We paid special attention on the background for this
LFV reaction, which arises from the standard model process $\mu^-\mu^+ -->
\mu\tau\bar{\nu}_{\mu}\nu_{\tau}$, and discuss how it can be separated from the
main signal.
| [
{
"created": "Tue, 18 Jan 2005 08:04:04 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cotti",
"U.",
""
],
[
"Pineda",
"M.",
""
],
[
"Tavares-Velasco",
"G.",
""
]
] | We consider an effective nondiagonal coupling $H\bar{\mu}\tau$ and present the analysis of the Higgs boson mediated lepton-flavor violating (LFV) reaction $\mu^-\mu^+ --> \mu \tau$. For a Higgs boson mass around 115 GeV and convenient values of the strength of the coupling $H\bar{\mu}\tau$, which are within the bounds obtained from the experimental limits on the LFV decays $\tau-->\eta\mu$ and $\tau-->\mu\gamma$, we found that there would be up to a few hundreds of $\mu \tau$ events per year at a muon collider running with an integrated luminosity of $1 fb^{-1}$. We paid special attention on the background for this LFV reaction, which arises from the standard model process $\mu^-\mu^+ --> \mu\tau\bar{\nu}_{\mu}\nu_{\tau}$, and discuss how it can be separated from the main signal. |
hep-ph/0303044 | Fabian Franke | H. Fraas, F. Franke, G. Moortgat-Pick, F. von der Pahlen, A. Wagner | Precision measurements of Higgs-chargino couplings in chargino pair
production at a muon collider | 14 pages, 5 figures | Eur.Phys.J.C29:587-595,2003 | 10.1140/epjc/s2003-01249-6 | WUE-ITP-2003-003 IPPP-03-03 DCPT-03-06 | hep-ph | null | We study chargino pair production on the heavy Higgs resonances at a muon
collider in the MSSM. At $\sqrt{s} \approx 350$ GeV cross sections up to 2 pb
are reached depending on the supersymmetric scenario and the beam energy
spread. The resonances of the scalar and pseudoscalar Higgs bosons may be
separated for $\tan\beta <8$.
Our aim is to determine the ratio of the chargino couplings to the heavy
scalar and pseudoscalar Higgs boson independently of the specific chargino
decay characteristics. The precision of the measurement depends on the energy
resolution of the muon collider and on the error in the measurement of the
cross sections of the non-Higgs channels including an irreducible standard
model background. With a high energy resolution the systematic error can be
reduced to the order of a few percent.
| [
{
"created": "Wed, 5 Mar 2003 20:45:40 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Jul 2003 19:28:57 GMT",
"version": "v2"
}
] | 2011-09-13 | [
[
"Fraas",
"H.",
""
],
[
"Franke",
"F.",
""
],
[
"Moortgat-Pick",
"G.",
""
],
[
"von der Pahlen",
"F.",
""
],
[
"Wagner",
"A.",
""
]
] | We study chargino pair production on the heavy Higgs resonances at a muon collider in the MSSM. At $\sqrt{s} \approx 350$ GeV cross sections up to 2 pb are reached depending on the supersymmetric scenario and the beam energy spread. The resonances of the scalar and pseudoscalar Higgs bosons may be separated for $\tan\beta <8$. Our aim is to determine the ratio of the chargino couplings to the heavy scalar and pseudoscalar Higgs boson independently of the specific chargino decay characteristics. The precision of the measurement depends on the energy resolution of the muon collider and on the error in the measurement of the cross sections of the non-Higgs channels including an irreducible standard model background. With a high energy resolution the systematic error can be reduced to the order of a few percent. |
2311.12158 | Gabriele Levati | Luca Di Luzio, Gabriele Levati and Paride Paradisi | The Chiral Lagrangian of CP-Violating Axion-Like Particles | Matches published version. 28 pages, 1 figure, 3 tables. FeynRules
models for both the 2-flavours and the 3-flavours case are provided in the
ancillary files | J. High Energ. Phys. 2024, 20 (2024) | 10.1007/JHEP02(2024)020 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We discuss the construction of the most general CP-violating chiral
Lagrangian for an axion-like particle (ALP). Starting with an effective
Lagrangian containing light quarks and gluons, we provide its matching onto a
chiral effective Lagrangian at $\mathcal{O}(p^2)$ described in terms of mesons
and baryons, identifying the correspondence between the Jarlskog invariants of
the two theories. After deriving the ALP interactions with mesons and baryons,
we analyse a few relevant phenomenological implications such as the permanent
electric dipole moments of nucleons and the CP-violating ALP and kaon
decays.This work provides the necessary tools for further phenomenological
analyses connecting low-energy observables with the couplings of the underlying
ultraviolet complete theory.
| [
{
"created": "Mon, 20 Nov 2023 20:24:11 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Feb 2024 11:19:16 GMT",
"version": "v2"
}
] | 2024-02-06 | [
[
"Di Luzio",
"Luca",
""
],
[
"Levati",
"Gabriele",
""
],
[
"Paradisi",
"Paride",
""
]
] | We discuss the construction of the most general CP-violating chiral Lagrangian for an axion-like particle (ALP). Starting with an effective Lagrangian containing light quarks and gluons, we provide its matching onto a chiral effective Lagrangian at $\mathcal{O}(p^2)$ described in terms of mesons and baryons, identifying the correspondence between the Jarlskog invariants of the two theories. After deriving the ALP interactions with mesons and baryons, we analyse a few relevant phenomenological implications such as the permanent electric dipole moments of nucleons and the CP-violating ALP and kaon decays.This work provides the necessary tools for further phenomenological analyses connecting low-energy observables with the couplings of the underlying ultraviolet complete theory. |
1702.04440 | Duojie Jia | Ming-Zhu Liu, Duo-Jie Jia and Dian-Yong Chen | Possible hadronic molecular states composed of $S$-wave heavy-light
mesons | 11 pages, 1 eps figure. Accepted in "Chin. Phys. C" | Chins. Phys. C, Vol. 41, No. 5 (2017) 053105 | 10.1088/1674-1137/41/5/053105 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a systematical study of possible molecular states composed of the
$S$ wave heavy light mesons, where the $S-D$ mixing and {$\eta-\eta^{\prime}$
mixing} are explicitly included. Our calculation indicates that the observed
$X(3872)$ could be a loosely shallow molecular state composed of $D\bar{D}^\ast
+h.c$, while neither $Z_c(3900)/Z_c(4020)$ nor $Z_b(10610)/Z_b(10650)$ is
supported to be a molecule. Some observed possible molecular states are
predicted, which could be searched for by further experimental measurements.
| [
{
"created": "Wed, 15 Feb 2017 01:52:18 GMT",
"version": "v1"
}
] | 2024-06-14 | [
[
"Liu",
"Ming-Zhu",
""
],
[
"Jia",
"Duo-Jie",
""
],
[
"Chen",
"Dian-Yong",
""
]
] | We perform a systematical study of possible molecular states composed of the $S$ wave heavy light mesons, where the $S-D$ mixing and {$\eta-\eta^{\prime}$ mixing} are explicitly included. Our calculation indicates that the observed $X(3872)$ could be a loosely shallow molecular state composed of $D\bar{D}^\ast +h.c$, while neither $Z_c(3900)/Z_c(4020)$ nor $Z_b(10610)/Z_b(10650)$ is supported to be a molecule. Some observed possible molecular states are predicted, which could be searched for by further experimental measurements. |
hep-ph/0411056 | Stanley J. Brodsky | S. J. Brodsky (SLAC) | New Results in Light-Front Phenomenology | Presented at LightCone 2004, Amsterdam, The Netherlands, 16-20 August
2004 | Few Body Syst.36:35-52,2005 | 10.1007/s00601-004-0077-8 | SLAC-PUB-10812 | hep-ph | null | The light-front quantization of gauge theories such as QCD in light-cone
gauge provides a frame-independent wavefunction representation of relativistic
bound states, simple forms for current matrix elements, explicit unitarity, and
a trivial vacuum. The freedom to choose the light-like quantization four-vector
provides an explicitly covariant formulation of light-front quantization and
can be used to determine the analytic structure of light-front wave functions
and to define a kinematical definition of angular momentum. The AdS/CFT
correspondence of large $N_C$ supergravity theory in higher-dimensional anti-de
Sitter space with supersymmetric QCD in 4-dimensional space-time has
interesting implications for hadron phenomenology in the conformal limit,
including an all-orders demonstration of counting rules for exclusive
processes. String/gauge duality also predicts the QCD power-law behavior of
light-front Fock-state hadronic wavefunctions with arbitrary orbital angular
momentum at high momentum transfer. The form of these near-conformal
wavefunctions can be used as an initial ansatz for a variational treatment of
the light-front QCD Hamiltonian. I also briefly review recent analyses which
shows that some leading-twist phenomena such as the diffractive component of
deep inelastic scattering, single-spin asymmetries, nuclear shadowing and
antishadowing cannot be computed from the LFWFs of hadrons in isolation.
| [
{
"created": "Thu, 4 Nov 2004 04:50:45 GMT",
"version": "v1"
}
] | 2009-09-11 | [
[
"Brodsky",
"S. J.",
"",
"SLAC"
]
] | The light-front quantization of gauge theories such as QCD in light-cone gauge provides a frame-independent wavefunction representation of relativistic bound states, simple forms for current matrix elements, explicit unitarity, and a trivial vacuum. The freedom to choose the light-like quantization four-vector provides an explicitly covariant formulation of light-front quantization and can be used to determine the analytic structure of light-front wave functions and to define a kinematical definition of angular momentum. The AdS/CFT correspondence of large $N_C$ supergravity theory in higher-dimensional anti-de Sitter space with supersymmetric QCD in 4-dimensional space-time has interesting implications for hadron phenomenology in the conformal limit, including an all-orders demonstration of counting rules for exclusive processes. String/gauge duality also predicts the QCD power-law behavior of light-front Fock-state hadronic wavefunctions with arbitrary orbital angular momentum at high momentum transfer. The form of these near-conformal wavefunctions can be used as an initial ansatz for a variational treatment of the light-front QCD Hamiltonian. I also briefly review recent analyses which shows that some leading-twist phenomena such as the diffractive component of deep inelastic scattering, single-spin asymmetries, nuclear shadowing and antishadowing cannot be computed from the LFWFs of hadrons in isolation. |
2309.02715 | Qing Chen | Qing Chen, Gui-Jun Ding, Richard J. Hill | General Heavy WIMP Nucleon Elastic Scattering | 22 pages, 8 figures | null | null | USTC-ICTS/PCFT-23-26; FERMILAB-PUB-23-423-T | hep-ph astro-ph.CO hep-ex | http://creativecommons.org/licenses/by/4.0/ | Heavy WIMP (weakly-interacting-massive-particle) effective field theory is
used to compute the WIMP-nucleon scattering rate for general heavy electroweak
multiplets through order $m_W/M$, where $m_W$ and $M$ denote the electroweak
and WIMP mass scales. The lightest neutral component of such an electroweak
multiplet is a candidate dark matter particle, either elementary or composite.
Existing computations for certain representations of electroweak
$\mathrm{SU(2)}_W\times \mathrm{U(1)}_Y$ reveal a cancellation of amplitudes
from different effective operators at leading and subleading orders in $1/M$,
yielding small cross sections that are below current dark matter direct
detection experimental sensitivities. We extend those computations and consider
all low-spin (spin-0, spin-1/2, spin-1, spin-3/2) heavy electroweak multiplets
with arbitrary $\mathrm{SU(2)}_W\times \mathrm{U(1)}_Y$ representations and
provide benchmark cross section results for dark matter direct detection
experiments. For most self-conjugate TeV WIMPs with isospin $\le 3$, the cross
sections are below current experimental limits but within reach of
next-generation experiments. An exception is the case of pure electroweak
doublet, where WIMPs are hidden below the neutrino floor.
| [
{
"created": "Wed, 6 Sep 2023 04:58:06 GMT",
"version": "v1"
}
] | 2023-09-07 | [
[
"Chen",
"Qing",
""
],
[
"Ding",
"Gui-Jun",
""
],
[
"Hill",
"Richard J.",
""
]
] | Heavy WIMP (weakly-interacting-massive-particle) effective field theory is used to compute the WIMP-nucleon scattering rate for general heavy electroweak multiplets through order $m_W/M$, where $m_W$ and $M$ denote the electroweak and WIMP mass scales. The lightest neutral component of such an electroweak multiplet is a candidate dark matter particle, either elementary or composite. Existing computations for certain representations of electroweak $\mathrm{SU(2)}_W\times \mathrm{U(1)}_Y$ reveal a cancellation of amplitudes from different effective operators at leading and subleading orders in $1/M$, yielding small cross sections that are below current dark matter direct detection experimental sensitivities. We extend those computations and consider all low-spin (spin-0, spin-1/2, spin-1, spin-3/2) heavy electroweak multiplets with arbitrary $\mathrm{SU(2)}_W\times \mathrm{U(1)}_Y$ representations and provide benchmark cross section results for dark matter direct detection experiments. For most self-conjugate TeV WIMPs with isospin $\le 3$, the cross sections are below current experimental limits but within reach of next-generation experiments. An exception is the case of pure electroweak doublet, where WIMPs are hidden below the neutrino floor. |
1907.08662 | Wim Cosyn | W. Cosyn, B. Pire, L. Szymanowski | Probing quark transversity GPDs in diffractive photo- and
electroproduction on the deuteron | Proceedings of DIS2019, 6 pages, 3 figures | null | null | CPHT-PC049.072019 | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Transversity generalized parton distributions (GPDs) can be probed in
diffractive electro- and photoproduction of two vector mesons on a hadron in
kinematics where the two vector mesons are separated by a large rapidity gap.
We report on calculations for this process in the case of coherent
$\rho^0-\omega$ meson production on a deuteron target. Our cross section
results show that an electron-ion collider with deuteron beams and forward
detectors could probe deuteron transversity GPDs.
| [
{
"created": "Fri, 19 Jul 2019 19:47:13 GMT",
"version": "v1"
}
] | 2019-07-23 | [
[
"Cosyn",
"W.",
""
],
[
"Pire",
"B.",
""
],
[
"Szymanowski",
"L.",
""
]
] | Transversity generalized parton distributions (GPDs) can be probed in diffractive electro- and photoproduction of two vector mesons on a hadron in kinematics where the two vector mesons are separated by a large rapidity gap. We report on calculations for this process in the case of coherent $\rho^0-\omega$ meson production on a deuteron target. Our cross section results show that an electron-ion collider with deuteron beams and forward detectors could probe deuteron transversity GPDs. |
hep-ph/0612115 | Masashi Wakamatsu | M. Wakamatsu | Generalized Form Factors, Generalized Parton Distributions and Spin
Contents of the Nucleon | 4 pages, 2 figures. Talk presented at SPIN2006, October 2-7, 2006,
Kyoto, Japan | AIP Conf.Proc.915:630-633,2007 | 10.1063/1.2750859 | OU-HET-571 | hep-ph | null | A model independent prediction is given for the nucleon spin contents, based
only upon a reasonable theoretical postulate on the isosinglet anomalous
gravitomagnetic moment of the nucleon.
| [
{
"created": "Mon, 11 Dec 2006 01:52:40 GMT",
"version": "v1"
}
] | 2011-04-11 | [
[
"Wakamatsu",
"M.",
""
]
] | A model independent prediction is given for the nucleon spin contents, based only upon a reasonable theoretical postulate on the isosinglet anomalous gravitomagnetic moment of the nucleon. |
hep-ph/0312083 | Atsushi Hosaka | A.W. Thomas, K. Hicks and A. Hosaka | A Method to Unambiguously Determine the Parity of the Theta+ Pentaquark | 3 pages | Prog.Theor.Phys.111:291-293,2004 | 10.1143/PTP.111.291 | null | hep-ph | null | With the recent discovery of the $\Theta(1540)$ pentaquark, the question of
its parity is paramount since this will constrain the correct description of
its internal structure. We show that the measurement of the spin singlet and
triplet cross sections for the reaction $\vec{p}\vec{p} \to \Sigma^+ \Theta^+$
will unambiguously determine the parity of the $\Theta^+$.
| [
{
"created": "Fri, 5 Dec 2003 13:29:30 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Dec 2003 06:28:18 GMT",
"version": "v2"
}
] | 2010-02-17 | [
[
"Thomas",
"A. W.",
""
],
[
"Hicks",
"K.",
""
],
[
"Hosaka",
"A.",
""
]
] | With the recent discovery of the $\Theta(1540)$ pentaquark, the question of its parity is paramount since this will constrain the correct description of its internal structure. We show that the measurement of the spin singlet and triplet cross sections for the reaction $\vec{p}\vec{p} \to \Sigma^+ \Theta^+$ will unambiguously determine the parity of the $\Theta^+$. |
1602.01322 | C. J. A. P. Martins | C. J. A. P. Martins, I. Yu. Rybak, A. Avgoustidis, E. P. S. Shellard | Extending the velocity-dependent one-scale model for domain walls | 10 pages, 7 figures; Phys. Rev. D (in press); v2: minor changes,
matches published version | Phys. Rev. D 93, 043534 (2016) | 10.1103/PhysRevD.93.043534 | null | hep-ph astro-ph.CO gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on an extensive study of the evolution of domain wall networks in
Friedmann-Lema\^{\i}tre-Robertson-Walker universes by means of the largest
currently available field-theory simulations. These simulations were done in
$4096^3$ boxes and for a range of different fixed expansion rates, as well as
for the transition between the radiation and matter eras. A detailed comparison
with the velocity-dependent one-scale (VOS) model shows that this cannot
accurately reproduce the results of the entire range of simulated regimes if
one assumes that the phenomenological energy loss and momentum parameters are
constants. We therefore discuss how a more accurate modeling of these
parameters can be done, specifically by introducing an additional mechanism of
energy loss (scalar radiation, which is particularly relevant for regimes with
relatively little damping) and a modified momentum parameter which is a
function of velocity (in analogy to what was previously done for cosmic
strings). We finally show that this extended model, appropriately calibrated,
provides an accurate fit to our simulations.
| [
{
"created": "Wed, 3 Feb 2016 14:48:34 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Feb 2016 18:32:31 GMT",
"version": "v2"
}
] | 2016-03-09 | [
[
"Martins",
"C. J. A. P.",
""
],
[
"Rybak",
"I. Yu.",
""
],
[
"Avgoustidis",
"A.",
""
],
[
"Shellard",
"E. P. S.",
""
]
] | We report on an extensive study of the evolution of domain wall networks in Friedmann-Lema\^{\i}tre-Robertson-Walker universes by means of the largest currently available field-theory simulations. These simulations were done in $4096^3$ boxes and for a range of different fixed expansion rates, as well as for the transition between the radiation and matter eras. A detailed comparison with the velocity-dependent one-scale (VOS) model shows that this cannot accurately reproduce the results of the entire range of simulated regimes if one assumes that the phenomenological energy loss and momentum parameters are constants. We therefore discuss how a more accurate modeling of these parameters can be done, specifically by introducing an additional mechanism of energy loss (scalar radiation, which is particularly relevant for regimes with relatively little damping) and a modified momentum parameter which is a function of velocity (in analogy to what was previously done for cosmic strings). We finally show that this extended model, appropriately calibrated, provides an accurate fit to our simulations. |
hep-ph/0011275 | Saebyok Bae | Saebyok Bae, Hong Seok Lee | Bounds on the Mass and Coupling Constant of Radion in the
Randall-Sundrum Theory | 11 pages, 3 figures, a minor change, to appear in Phys. Lett. B | Phys.Lett. B506 (2001) 147-154 | 10.1016/S0370-2693(01)00415-4 | null | hep-ph | null | Assuming the Goldberger-Wise mechanism, we investigated the effective
potential at the one-loop level in the Randall-Sundrum theory. We found the
lower and upper bounds of the radion mass m_\phi and the radion-SM coupling
constant, 0.8 GeV \lesssim m_\phi \lesssim 260 GeV and 1400 GeV \lesssim
\Lambda_\phi \lesssim 1500 GeV for the one-loop level potential. These bounds
were determined from two constraints of warp factor = O(M_W/M_{Pl}) and Higgs
vev \simeq 246 GeV, which can produce strong bounds of m_\phi and \Lambda_\phi.
It is phenomenologically important that the one-loop allowed upper bound of the
radion mass is about five times larger than the tree-level one, but the radion
is still lighter than the Kaluza-Klein modes.
| [
{
"created": "Wed, 22 Nov 2000 07:06:46 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jan 2001 06:26:25 GMT",
"version": "v2"
},
{
"created": "Tue, 27 Mar 2001 13:10:58 GMT",
"version": "v3"
},
{
"created": "Tue, 17 Apr 2001 08:20:31 GMT",
"version": "v4"
}
] | 2009-10-31 | [
[
"Bae",
"Saebyok",
""
],
[
"Lee",
"Hong Seok",
""
]
] | Assuming the Goldberger-Wise mechanism, we investigated the effective potential at the one-loop level in the Randall-Sundrum theory. We found the lower and upper bounds of the radion mass m_\phi and the radion-SM coupling constant, 0.8 GeV \lesssim m_\phi \lesssim 260 GeV and 1400 GeV \lesssim \Lambda_\phi \lesssim 1500 GeV for the one-loop level potential. These bounds were determined from two constraints of warp factor = O(M_W/M_{Pl}) and Higgs vev \simeq 246 GeV, which can produce strong bounds of m_\phi and \Lambda_\phi. It is phenomenologically important that the one-loop allowed upper bound of the radion mass is about five times larger than the tree-level one, but the radion is still lighter than the Kaluza-Klein modes. |
1208.3562 | Joseph Conlon | Michele Cicoli, Joseph P. Conlon, Fernando Quevedo | Dark Radiation in LARGE Volume Models | 6 pages; v2. refs updated | null | 10.1103/PhysRevD.87.043520 | DAMTP-2012-59 | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider reheating driven by volume modulus decays in the LARGE Volume
Scenario. Such reheating always generates non-zero dark radiation through the
decays to the axion partner, while the only competitive visible sector decays
are Higgs pairs via the Giudice-Masiero term. In the framework of sequestered
models where the cosmological moduli problem is absent, the simplest model with
a shift-symmetric Higgs sector generates 1.56 < N_{eff} - N_{eff,SM} < 1.74.
For more general cases, the known experimental bounds on N_{eff} strongly
constrain the parameters and matter content of the models.
| [
{
"created": "Fri, 17 Aug 2012 10:00:00 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Sep 2012 16:10:38 GMT",
"version": "v2"
}
] | 2013-03-14 | [
[
"Cicoli",
"Michele",
""
],
[
"Conlon",
"Joseph P.",
""
],
[
"Quevedo",
"Fernando",
""
]
] | We consider reheating driven by volume modulus decays in the LARGE Volume Scenario. Such reheating always generates non-zero dark radiation through the decays to the axion partner, while the only competitive visible sector decays are Higgs pairs via the Giudice-Masiero term. In the framework of sequestered models where the cosmological moduli problem is absent, the simplest model with a shift-symmetric Higgs sector generates 1.56 < N_{eff} - N_{eff,SM} < 1.74. For more general cases, the known experimental bounds on N_{eff} strongly constrain the parameters and matter content of the models. |
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