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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9908343 | Michael Gronau | Michael Gronau | CP Violation and B Physics | 12 pages, SLAC-PUB-8221, Invited talk given at the 1999 Conference on
Kaon Physics, Chicago, IL, June 21-26, 1999 | null | null | null | hep-ph | null | This is a quick review of CP non-conservation in $B$ physics. Several methods
are described for testing the Kobayashi-Maskawa single phase origin of CP
violation in B decays, pointing out some limitations due to hadronic
uncertainties. A few characteristic signatures of new physics in B decay
asymmetries are listed.
| [
{
"created": "Thu, 12 Aug 1999 21:04:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gronau",
"Michael",
""
]
] | This is a quick review of CP non-conservation in $B$ physics. Several methods are described for testing the Kobayashi-Maskawa single phase origin of CP violation in B decays, pointing out some limitations due to hadronic uncertainties. A few characteristic signatures of new physics in B decay asymmetries are listed. |
hep-ph/0110392 | Isabela Porto Cavalcante | Isabela P. Cavalcante and J. S\'a Borges | Crossing Symmetry Violation of Unitarized Pion-Pion Amplitude in the
Resonance Region | 6 pages, 4 figures | J.Phys.G28:1351-1358,2002 | 10.1088/0954-3899/28/6/315 | null | hep-ph | null | Pion-pion scattering amplitude obtained from one-loop Chiral Perturbation
Theory (ChPT) is crossing symmetric, however the corresponding partial wave
amplitudes do not respect exact unitarity relation. There are different
approaches to get unitarized partial wave amplitudes from ChPT. Here we
consider the inverse amplitude method (IAM) that is often used to fit pion-pion
phase shifts to experimental data, by adjusting free parameters. We measure the
amount of crossing symmetry violation (CSV) in this case and we show that
crossing symmetry is badly violated by the IAM unitarized ChPT amplitude in the
resonance region. Important CSV also occurs when all free parameters are set
equal to zero.
| [
{
"created": "Tue, 30 Oct 2001 20:05:57 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Cavalcante",
"Isabela P.",
""
],
[
"Borges",
"J. Sá",
""
]
] | Pion-pion scattering amplitude obtained from one-loop Chiral Perturbation Theory (ChPT) is crossing symmetric, however the corresponding partial wave amplitudes do not respect exact unitarity relation. There are different approaches to get unitarized partial wave amplitudes from ChPT. Here we consider the inverse amplitude method (IAM) that is often used to fit pion-pion phase shifts to experimental data, by adjusting free parameters. We measure the amount of crossing symmetry violation (CSV) in this case and we show that crossing symmetry is badly violated by the IAM unitarized ChPT amplitude in the resonance region. Important CSV also occurs when all free parameters are set equal to zero. |
hep-ph/0203173 | Huo WuJun | W.J. Huo and T.F. Feng (IHEP, Cas) | Constraints of the fourth generation from $g_\mu -2$ | 7 pages, 3 figures, to appear in Phys. Lett. B | null | null | null | hep-ph | null | We investigate the newly observed muon $g_\mu -2$ anomaly in the framework of
a sequential fourth generation model with a heavy fourth neutrino, $\nu'$. We
find that $g_\mu -2$ can exclude most values of $m_{\nu'}$ and put a very
stringent constraint on the existence of the fourth generation. We also obtain
bounds of a $4\times 4$ leptonic mixing matrix elements, $V_{2\nu'}$ if it
really exists.
| [
{
"created": "Mon, 18 Mar 2002 16:31:17 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Mar 2002 12:53:29 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Huo",
"W. J.",
"",
"IHEP, Cas"
],
[
"Feng",
"T. F.",
"",
"IHEP, Cas"
]
] | We investigate the newly observed muon $g_\mu -2$ anomaly in the framework of a sequential fourth generation model with a heavy fourth neutrino, $\nu'$. We find that $g_\mu -2$ can exclude most values of $m_{\nu'}$ and put a very stringent constraint on the existence of the fourth generation. We also obtain bounds of a $4\times 4$ leptonic mixing matrix elements, $V_{2\nu'}$ if it really exists. |
hep-ph/0610178 | Pavel Fileviez Perez | David Emmanuel-Costa, Pavel Fileviez Perez, Ricardo Gonzalez Felipe | Natural Gauge and Gravitational Coupling Unification and the
Superpartner Masses | 8 pages, 4 figures, version accepted in Physics Letters B | Phys.Lett.B648:60-63,2007 | 10.1016/j.physletb.2007.02.061 | null | hep-ph hep-ex hep-th | null | The possibility to achieve unification at the string scale in the context of
the simplest supersymmetric grand unified theory is investigated. We find
conservative upper bounds on the superpartner masses consistent with the
unification of gauge and gravitational couplings, M_{\tilde G} < 5 TeV and
M_{\tilde f} < 3 \times 10^7 GeV, for the superparticles with spin one-half and
zero, respectively. These bounds hint towards the possibility that this
supersymmetric scenario could be tested at future colliders, and in particular,
at the forthcoming LHC.
| [
{
"created": "Sat, 14 Oct 2006 14:33:13 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Feb 2007 15:31:29 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Emmanuel-Costa",
"David",
""
],
[
"Perez",
"Pavel Fileviez",
""
],
[
"Felipe",
"Ricardo Gonzalez",
""
]
] | The possibility to achieve unification at the string scale in the context of the simplest supersymmetric grand unified theory is investigated. We find conservative upper bounds on the superpartner masses consistent with the unification of gauge and gravitational couplings, M_{\tilde G} < 5 TeV and M_{\tilde f} < 3 \times 10^7 GeV, for the superparticles with spin one-half and zero, respectively. These bounds hint towards the possibility that this supersymmetric scenario could be tested at future colliders, and in particular, at the forthcoming LHC. |
2205.02912 | Serdar Spor | A. Senol, S. Spor, E. Gurkanli, V. Cetinkaya, H. Denizli, M. K\"oksal | Model-independent study on the anomalous $ZZ\gamma$ and $Z\gamma\gamma$
couplings at the future muon collider | 21 pages, 9 figures | European Physical Journal Plus, (2022) 137:1354 | 10.1140/epjp/s13360-022-03569-8 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study, we investigate the potential of $\mu^{-} \mu^{+}\to Z\gamma
\to \nu\bar{\nu}\gamma$ process at the future muon collider with a
center-of-mass energy of 3 TeV to examine the anomalous $ZZ\gamma$ and
$Z\gamma\gamma$ neutral triple gauge couplings defining $CP$-conserving
$C_{\widetilde{B}W}/{\Lambda^4}$ coupling and three $CP$-violating
$C_{BB}/{\Lambda^4}$, $C_{BW}/{\Lambda^4}$, $C_{WW}/{\Lambda^4}$ couplings. All
signal and relevant background events are generated in MadGraph and passed
through Pythia for parton showering and hadronization. Detector effects are
also considered via tuned muon detector cards in Delphes. The effects of
systematic uncertainties of $0\%$, $3\%$ and $5\%$ on the sensitivities are
studied. The best sensitivities obtained from the process $\mu^{-} \mu^{+}\to
Z\gamma \to \nu\bar{\nu}\gamma$ are $[-6.53;6.64]\times10^{-2}$ TeV$^{-4}$ on
$CP$-conserving $C_{\widetilde{B}W}/{\Lambda^4}$ coupling and
$[-2.47;2.47]\times10^{-2}$ TeV$^{-4}$, $[-8.46;8.46]\times10^{-2}$ TeV$^{-4}$
and $[-2.20;2.20]\times10^{-1}$ TeV$^{-4}$ on $CP$-conserving
$C_{BB}/{\Lambda^4}$, $C_{BW}/{\Lambda^4}$, $C_{WW}/{\Lambda^4}$ couplings ,
respectively. Our obtained results on the anomalous neutral gauge couplings set
more stringent sensitivity, ranging between 5 and 15 times than the current
experimental results while slightly better than the phenomenological studies at
future pp colliders such as the HL-LHC, the HE-LHC and the FCC-hh,
respectively. On the other hand, we can see that the bounds on the anomalous
neutral gauge couplings expected to be obtained for the future $e^{-}e^{+}$
colliders such as the CLIC are roughly 2 times better than our results.
| [
{
"created": "Thu, 5 May 2022 20:36:02 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Dec 2022 14:35:38 GMT",
"version": "v2"
}
] | 2022-12-20 | [
[
"Senol",
"A.",
""
],
[
"Spor",
"S.",
""
],
[
"Gurkanli",
"E.",
""
],
[
"Cetinkaya",
"V.",
""
],
[
"Denizli",
"H.",
""
],
[
"Köksal",
"M.",
""
]
] | In this study, we investigate the potential of $\mu^{-} \mu^{+}\to Z\gamma \to \nu\bar{\nu}\gamma$ process at the future muon collider with a center-of-mass energy of 3 TeV to examine the anomalous $ZZ\gamma$ and $Z\gamma\gamma$ neutral triple gauge couplings defining $CP$-conserving $C_{\widetilde{B}W}/{\Lambda^4}$ coupling and three $CP$-violating $C_{BB}/{\Lambda^4}$, $C_{BW}/{\Lambda^4}$, $C_{WW}/{\Lambda^4}$ couplings. All signal and relevant background events are generated in MadGraph and passed through Pythia for parton showering and hadronization. Detector effects are also considered via tuned muon detector cards in Delphes. The effects of systematic uncertainties of $0\%$, $3\%$ and $5\%$ on the sensitivities are studied. The best sensitivities obtained from the process $\mu^{-} \mu^{+}\to Z\gamma \to \nu\bar{\nu}\gamma$ are $[-6.53;6.64]\times10^{-2}$ TeV$^{-4}$ on $CP$-conserving $C_{\widetilde{B}W}/{\Lambda^4}$ coupling and $[-2.47;2.47]\times10^{-2}$ TeV$^{-4}$, $[-8.46;8.46]\times10^{-2}$ TeV$^{-4}$ and $[-2.20;2.20]\times10^{-1}$ TeV$^{-4}$ on $CP$-conserving $C_{BB}/{\Lambda^4}$, $C_{BW}/{\Lambda^4}$, $C_{WW}/{\Lambda^4}$ couplings , respectively. Our obtained results on the anomalous neutral gauge couplings set more stringent sensitivity, ranging between 5 and 15 times than the current experimental results while slightly better than the phenomenological studies at future pp colliders such as the HL-LHC, the HE-LHC and the FCC-hh, respectively. On the other hand, we can see that the bounds on the anomalous neutral gauge couplings expected to be obtained for the future $e^{-}e^{+}$ colliders such as the CLIC are roughly 2 times better than our results. |
1910.05711 | Graciela B. Gelmini | Graciela B. Gelmini | Blois 2019: highlights and outlook | 13 pages, 5 figures, blois.cls file necessary for typeset. Summary
talk to be published in the proceedings of the conference | null | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is an idiosyncratic account of the main results presented at the 31st
Rencontres de Blois, which took place from June 2nd to June 7th, 2019 in the
Castle of Blois, France.
| [
{
"created": "Sun, 13 Oct 2019 08:39:26 GMT",
"version": "v1"
}
] | 2019-10-15 | [
[
"Gelmini",
"Graciela B.",
""
]
] | This is an idiosyncratic account of the main results presented at the 31st Rencontres de Blois, which took place from June 2nd to June 7th, 2019 in the Castle of Blois, France. |
hep-ph/0412121 | Sangyong Jeon | Sangyong Jeon | The Boltzmann Equation in Classical and Quantum Field Theory | 22 pages, 3 eps figures. Version to appear in Physical Review C | Phys.Rev. C72 (2005) 014907 | 10.1103/PhysRevC.72.014907 | null | hep-ph | null | Improving upon the previous treatment by Mueller and Son, we derive the
Boltzmann equation that results from a classical scalar field theory. This is
obtained by starting from the corresponding quantum field theory and taking the
classical limit with particular emphasis on the path integral and perturbation
theory. A previously overlooked Van-Vleck determinant is shown to control the
tadpole type of self-energy that can still appear in the classical perturbation
theory. Further comments on the validity of the approximations and possible
applications are also given.
| [
{
"created": "Wed, 8 Dec 2004 21:52:53 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jan 2005 17:45:04 GMT",
"version": "v2"
},
{
"created": "Mon, 18 Jul 2005 15:31:13 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Jeon",
"Sangyong",
""
]
] | Improving upon the previous treatment by Mueller and Son, we derive the Boltzmann equation that results from a classical scalar field theory. This is obtained by starting from the corresponding quantum field theory and taking the classical limit with particular emphasis on the path integral and perturbation theory. A previously overlooked Van-Vleck determinant is shown to control the tadpole type of self-energy that can still appear in the classical perturbation theory. Further comments on the validity of the approximations and possible applications are also given. |
1904.08016 | Astrid Nathalie Hiller Blin | A. N. Hiller Blin, V. Mokeev, M. Albaladejo, C. Fern\'andez-Ram\'irez,
V. Mathieu, A. Pilloni, A.Szczepaniak, V. D. Burkert, V. V. Chesnokov, A. A.
Golubenko, M. Vanderhaeghen | Nucleon resonance contributions to unpolarised inclusive electron
scattering | null | Phys. Rev. C 100, 035201 (2019) | 10.1103/PhysRevC.100.035201 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The first CLAS12 experiments will provide high-precision data on inclusive
electron scattering observables at a photon virtuality $Q^2$ ranging from 0.05
GeV$^2$ to 12 GeV$^2$ and center-of-mass energies $W$ up to 4 GeV. In view of
this endeavour, we present the modeling of the resonant contributions to the
inclusive electron scattering observables. As input, we use the existing CLAS
electrocoupling results obtained from exclusive meson electroproduction data
off protons, and evaluate for the first time the resonant contributions based
on the experimental results on the nucleon resonance electroexcitation. The
uncertainties are given by the data and duly propagated through a Monte Carlo
approach. In this way, we obtain estimates for the resonant contributions,
important for insight into the nucleon parton distributions in the resonance
region and for the studies of quark-hadron duality.
| [
{
"created": "Tue, 16 Apr 2019 23:30:41 GMT",
"version": "v1"
}
] | 2019-09-11 | [
[
"Blin",
"A. N. Hiller",
""
],
[
"Mokeev",
"V.",
""
],
[
"Albaladejo",
"M.",
""
],
[
"Fernández-Ramírez",
"C.",
""
],
[
"Mathieu",
"V.",
""
],
[
"Pilloni",
"A.",
""
],
[
"Szczepaniak",
"A.",
""
],
[
"Burkert",
"V. D.",
""
],
[
"Chesnokov",
"V. V.",
""
],
[
"Golubenko",
"A. A.",
""
],
[
"Vanderhaeghen",
"M.",
""
]
] | The first CLAS12 experiments will provide high-precision data on inclusive electron scattering observables at a photon virtuality $Q^2$ ranging from 0.05 GeV$^2$ to 12 GeV$^2$ and center-of-mass energies $W$ up to 4 GeV. In view of this endeavour, we present the modeling of the resonant contributions to the inclusive electron scattering observables. As input, we use the existing CLAS electrocoupling results obtained from exclusive meson electroproduction data off protons, and evaluate for the first time the resonant contributions based on the experimental results on the nucleon resonance electroexcitation. The uncertainties are given by the data and duly propagated through a Monte Carlo approach. In this way, we obtain estimates for the resonant contributions, important for insight into the nucleon parton distributions in the resonance region and for the studies of quark-hadron duality. |
1212.5604 | Yang Bai | Yang Bai, Vernon Barger, Lisa L. Everett and Gabe Shaughnessy | 2HDM Portal Dark Matter: LHC data and the Fermi-LAT 135 GeV Line | 6 pages, 4 figures | Phys.Rev.D88:015008,2013 | 10.1103/PhysRevD.88.015008 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a two Higgs doublet model augmented by a scalar dark matter particle
that provides an excellent fit to the LHC Higgs data and the Fermi-LAT 135 GeV
line. The heavy CP-even Higgs boson, which predominantly mediates annihilation
and scattering, must have a coupling to weak gauge bosons at or below percent
level to suppress the continuum gamma-ray spectrum below the limit from the
Fermi-LAT data and the anti-proton spectrum constrained by the PAMELA data.
Discovering or excluding this CP-even Higgs boson at the LHC with a mass
between 265 and 280 GeV and an enhanced diphoton branching ratio is crucial to
test this scenario.
| [
{
"created": "Fri, 21 Dec 2012 21:00:02 GMT",
"version": "v1"
}
] | 2013-07-30 | [
[
"Bai",
"Yang",
""
],
[
"Barger",
"Vernon",
""
],
[
"Everett",
"Lisa L.",
""
],
[
"Shaughnessy",
"Gabe",
""
]
] | We study a two Higgs doublet model augmented by a scalar dark matter particle that provides an excellent fit to the LHC Higgs data and the Fermi-LAT 135 GeV line. The heavy CP-even Higgs boson, which predominantly mediates annihilation and scattering, must have a coupling to weak gauge bosons at or below percent level to suppress the continuum gamma-ray spectrum below the limit from the Fermi-LAT data and the anti-proton spectrum constrained by the PAMELA data. Discovering or excluding this CP-even Higgs boson at the LHC with a mass between 265 and 280 GeV and an enhanced diphoton branching ratio is crucial to test this scenario. |
hep-ph/0002257 | Craig Tyler | Craig Tyler, Angela V. Olinto (Chicago, USA), Guenter Sigl (DARC,
CNRS, Obs.Paris-Meudon, France) | Cosmic Neutrinos and New Physics beyond the Electroweak Scale | 14 latex pages, uses revtex; final version as appears in PRD | Phys.Rev. D63 (2001) 055001 | 10.1103/PhysRevD.63.055001 | null | hep-ph astro-ph | null | New physics beyond the electroweak scale may increase weak interaction cross
sections beyond the Standard Model predictions. Such cross sections can be
expected within theories that solve the hierarchy problem of known interactions
with a unification scale in the TeV range. We derive constraints on these cross
sections from the flux of neutrinos expected from cosmic ray interactions with
the microwave background and the non-observation of horizontal air showers. We
also discuss how this limit can be improved by upcoming cosmic ray and neutrino
experiments, and how the energy dependence of the new interactions can be
probed by these experiments.
| [
{
"created": "Thu, 24 Feb 2000 22:37:52 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Jan 2001 00:39:57 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Tyler",
"Craig",
"",
"Chicago, USA"
],
[
"Olinto",
"Angela V.",
"",
"Chicago, USA"
],
[
"Sigl",
"Guenter",
"",
"DARC,\n CNRS, Obs.Paris-Meudon, France"
]
] | New physics beyond the electroweak scale may increase weak interaction cross sections beyond the Standard Model predictions. Such cross sections can be expected within theories that solve the hierarchy problem of known interactions with a unification scale in the TeV range. We derive constraints on these cross sections from the flux of neutrinos expected from cosmic ray interactions with the microwave background and the non-observation of horizontal air showers. We also discuss how this limit can be improved by upcoming cosmic ray and neutrino experiments, and how the energy dependence of the new interactions can be probed by these experiments. |
1901.09552 | Antonio Enrique C\'arcamo Hern\'andez | A. E. C\'arcamo Hern\'andez, Sergey Kovalenko, Roman Pasechnik, Ivan
Schmidt | Phenomenology of an extended IDM with loop-generated fermion mass
hierarchies | Version accepted for publication in EPJC. arXiv admin note: text
overlap with arXiv:1901.02764 | null | 10.1140/epjc/s10052-019-7101-0 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a comprehensive analysis of the most distinctive and important
phenomenological implications of the recently proposed mechanism of sequential
loop generation of strong hierarchies in the Standard Model (SM) fermion mass
spectra. This mechanism is consistently realized at the level of renormalizable
interactions in an extended variant of the Inert Higgs Doublet model,
possessing the additional $Z_{2}^{(1)}\times Z_{2}^{(2)}$ discrete and $U_{1X}$
gauge family symmetries, while the matter sectors of the SM are extended by
means of $SU_{2L}$-singlet scalars, heavy vector-like leptons and quarks, as
well as right-handed neutrinos. We thoroughly analyze the most stringent
constraints on the model parameter space, coming from the $Z^{\prime }$
collider searches, related to the anomaly in lepton universality, and the muon
anomalous magnetic moment, as well as provide benchmark points for further
tests of the model and discuss possible "standard candle" signatures relevant
for future explorations.
| [
{
"created": "Mon, 28 Jan 2019 08:53:19 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Jul 2019 17:09:30 GMT",
"version": "v2"
}
] | 2019-09-04 | [
[
"Hernández",
"A. E. Cárcamo",
""
],
[
"Kovalenko",
"Sergey",
""
],
[
"Pasechnik",
"Roman",
""
],
[
"Schmidt",
"Ivan",
""
]
] | We perform a comprehensive analysis of the most distinctive and important phenomenological implications of the recently proposed mechanism of sequential loop generation of strong hierarchies in the Standard Model (SM) fermion mass spectra. This mechanism is consistently realized at the level of renormalizable interactions in an extended variant of the Inert Higgs Doublet model, possessing the additional $Z_{2}^{(1)}\times Z_{2}^{(2)}$ discrete and $U_{1X}$ gauge family symmetries, while the matter sectors of the SM are extended by means of $SU_{2L}$-singlet scalars, heavy vector-like leptons and quarks, as well as right-handed neutrinos. We thoroughly analyze the most stringent constraints on the model parameter space, coming from the $Z^{\prime }$ collider searches, related to the anomaly in lepton universality, and the muon anomalous magnetic moment, as well as provide benchmark points for further tests of the model and discuss possible "standard candle" signatures relevant for future explorations. |
hep-ph/0510188 | Thorsten Renk | Thorsten Renk | The influence of flow on the jet quenching power in heavy-ion collisions | Contribution to QM'2005 poster session proceedings, section 3 | Acta Phys.Hung. A27 (2006) 263-266 | 10.1556/APH.27.2006.2-3.19 | null | hep-ph | null | The flow pattern and evolution of the medium created in ultrarelativistic
heavy ion collisions can have significant influence on the energy loss of hard
partons traversing the medium. We demonstrate that within a range of
assumptions for longitudinal and transverse flow which are all compatible with
the measured hadronic single particle distributions, the quenching power of the
medium can vary within almost a factor five. Thus, the choice of the medium
evolution is one of the biggest uncertainties in jet quenching calculations and
needs to be addressed with some care.
| [
{
"created": "Fri, 14 Oct 2005 09:50:23 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Renk",
"Thorsten",
""
]
] | The flow pattern and evolution of the medium created in ultrarelativistic heavy ion collisions can have significant influence on the energy loss of hard partons traversing the medium. We demonstrate that within a range of assumptions for longitudinal and transverse flow which are all compatible with the measured hadronic single particle distributions, the quenching power of the medium can vary within almost a factor five. Thus, the choice of the medium evolution is one of the biggest uncertainties in jet quenching calculations and needs to be addressed with some care. |
hep-ph/0005284 | Xiaolin Chen | Wei Liu, Hanqing Zheng and Xiao-Lin Chen | A Numerical Analysis to the {$\pi$} and {K} Coupled--Channel Scalar
Form-factor | 8 pages, Latex, 3 figures. Minor changes and one reference added | Commun.Theor.Phys. 35 (2001) 543-546 | 10.1088/0253-6102/35/5/543 | null | hep-ph | null | A numerical analysis to the scalar form-factor in the $\pi\pi$ and KK
coupled--channel system is made by solving the coupled-channel dispersive
integral equations, using the iteration method. The solutions are found not
unique. Physical application to the $\pi\pi$ central production in the $pp\to
pp\pi\pi$ process is discussed based upon the numerical solutions we found.
| [
{
"created": "Mon, 29 May 2000 15:09:40 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Jul 2000 02:54:14 GMT",
"version": "v2"
}
] | 2018-01-17 | [
[
"Liu",
"Wei",
""
],
[
"Zheng",
"Hanqing",
""
],
[
"Chen",
"Xiao-Lin",
""
]
] | A numerical analysis to the scalar form-factor in the $\pi\pi$ and KK coupled--channel system is made by solving the coupled-channel dispersive integral equations, using the iteration method. The solutions are found not unique. Physical application to the $\pi\pi$ central production in the $pp\to pp\pi\pi$ process is discussed based upon the numerical solutions we found. |
hep-ph/0701070 | Hisakazu Minakata | Hisakazu Minakata | Neutrinos; Opportunities and Strategies in the Future | Comments 27 pages, 13 figures, Combined and slightly expanded written
version of the invited talks given at International Conference ``Heavy Quarks
and Leptons'', Munich, Germany, October 16-20, 2006, and Second World Summit
on ``Physics Beyond the Standard Model'', Galapagos Islands, Ecuador, June
22-25, 2006 (post-deadline version) | ECONFC0610161:036,2006 | null | null | hep-ph | null | I try to give an overview of future prospects of the experimental exploration
of the unknowns in the neutrino mass pattern and the lepton flavor mixing.
Because of the nature of the lectures on which this manuscript is based, I give
some pedagogical discussions to prepare for the presentation in the later part.
I start from measuring \theta_{13} by reactors and accelerators as a
prerequisite for proceeding to search for leptonic CP violation. I then discuss
how CP violation can be uncovered, and how the neutrino mass hierarchy can be
determined. I do these by resolving so called the ``parameter degeneracy''
which is necessary anyway if one wants to seek precision measurement of the
lepton mixing parameters. As a concrete setting for resolving the degeneracy I
introduce the Tokai-to-Kamioka-Korea two detector complex which receives
neutrino superbeam from J-PARC, sometimes dubbed as ``T2KK''. It is shown that
T2KK is able to resolve all the eight-fold parameter degeneracy in a wide range
of the lepton mixing parameters. I also discuss an alternative way for lifting
the \theta_{23} octant degeneracy by reactor-accelerator combined method.
Finally, I discuss by taking some examples how some theoretically or
phenomenologically motivated ideas can be tested experimentally.
| [
{
"created": "Wed, 10 Jan 2007 12:52:21 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Minakata",
"Hisakazu",
""
]
] | I try to give an overview of future prospects of the experimental exploration of the unknowns in the neutrino mass pattern and the lepton flavor mixing. Because of the nature of the lectures on which this manuscript is based, I give some pedagogical discussions to prepare for the presentation in the later part. I start from measuring \theta_{13} by reactors and accelerators as a prerequisite for proceeding to search for leptonic CP violation. I then discuss how CP violation can be uncovered, and how the neutrino mass hierarchy can be determined. I do these by resolving so called the ``parameter degeneracy'' which is necessary anyway if one wants to seek precision measurement of the lepton mixing parameters. As a concrete setting for resolving the degeneracy I introduce the Tokai-to-Kamioka-Korea two detector complex which receives neutrino superbeam from J-PARC, sometimes dubbed as ``T2KK''. It is shown that T2KK is able to resolve all the eight-fold parameter degeneracy in a wide range of the lepton mixing parameters. I also discuss an alternative way for lifting the \theta_{23} octant degeneracy by reactor-accelerator combined method. Finally, I discuss by taking some examples how some theoretically or phenomenologically motivated ideas can be tested experimentally. |
1506.05575 | Soodeh Zarepour | S. Mohammad Zebarjad and Soodeh Zarepour | Two-body decay widths of lowest lying and next-to-lowest lying scalar
and pseudoscalar mesons in generalized linear sigma model | 21 pages, 12 figures | Int. J. Mod. Phys. A 30, 1550134, 2015 | 10.1142/S0217751X15501341 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two-body decay widths of lowest lying and next-to-lowest lying scalar and
pseudoscalar mesons are studied in Generalized Linear Sigma Model (GLSM) of
low-energy QCD. This model which considers mixing between "two quark" and "four
quark" chiral nonets has been employed to investigate various decays and
scatterings in low energy region of QCD. In this paper, $\Gamma[f_0(980)
\rightarrow K \bar{K}]$ and $\Gamma[a_0(980) \rightarrow K \bar{K}]$ are
obtained and it is shown that two-body decay widths of lowest lying mesons are
well predicted by this model while for the next-to-lowest lying mesons, only
some of the decay widths agree with the experimental results. We have compared
the predicted decay widths in GLSM with the results obtained in single nonet
linear sigma model (SNLSM) to indicate that chiral nonet mixing greatly
improves the predictions of SNLSM for decay widths.
| [
{
"created": "Thu, 18 Jun 2015 07:51:57 GMT",
"version": "v1"
}
] | 2015-07-28 | [
[
"Zebarjad",
"S. Mohammad",
""
],
[
"Zarepour",
"Soodeh",
""
]
] | Two-body decay widths of lowest lying and next-to-lowest lying scalar and pseudoscalar mesons are studied in Generalized Linear Sigma Model (GLSM) of low-energy QCD. This model which considers mixing between "two quark" and "four quark" chiral nonets has been employed to investigate various decays and scatterings in low energy region of QCD. In this paper, $\Gamma[f_0(980) \rightarrow K \bar{K}]$ and $\Gamma[a_0(980) \rightarrow K \bar{K}]$ are obtained and it is shown that two-body decay widths of lowest lying mesons are well predicted by this model while for the next-to-lowest lying mesons, only some of the decay widths agree with the experimental results. We have compared the predicted decay widths in GLSM with the results obtained in single nonet linear sigma model (SNLSM) to indicate that chiral nonet mixing greatly improves the predictions of SNLSM for decay widths. |
hep-ph/0112240 | Kai Hencken | Kai Hencken | Coherent electromagnetic processes in relativistic heavy ion collisions | 10 pages, invited talk presented at the Workshop on Electromagnetic
Probes of Fundamental Physics, Oct. 16-21, 2001, Erice, Italy | null | null | null | hep-ph | null | Using the strong electromagnetic fields in peripheral heavy ion collisions
gives rise to a number of interesting possibilities of applications in both
photon-photon and photon-hadron physics. We look at the theoretical foundations
of the equivalent photon approximation and the specific problems in the heavy
ion case. The interesting physics processes that can be studied in this way are
outlined. Electron positron pair production plays a special role. We look at
multiple pair production and Coulomb corrections as typical strong field
effects. But electron positron pair production is also an important loss
process and has some practical applications.
| [
{
"created": "Tue, 18 Dec 2001 13:40:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hencken",
"Kai",
""
]
] | Using the strong electromagnetic fields in peripheral heavy ion collisions gives rise to a number of interesting possibilities of applications in both photon-photon and photon-hadron physics. We look at the theoretical foundations of the equivalent photon approximation and the specific problems in the heavy ion case. The interesting physics processes that can be studied in this way are outlined. Electron positron pair production plays a special role. We look at multiple pair production and Coulomb corrections as typical strong field effects. But electron positron pair production is also an important loss process and has some practical applications. |
hep-ph/0506110 | Andrej Arbuzov | A. Arbuzov, D. Bardin, S. Bondarenko, P. Christova, L. Kalinovskaya,
G. Nanava, and R. Sadykov | One-loop corrections to the Drell-Yan process in SANC (I). The charged
current case | extended version submitted to EPJC | Eur.Phys.J.C46:407-412,2006; Erratum-ibid.C50:505,2007;
Erratum-ibid.C50:505-505,2007 | 10.1140/epjc/s2006-02505-y 10.1140/epjc/s10052-007-0225-7 | null | hep-ph | null | Radiative corrections to the charged current Drell-Yan processes are
revisited. Complete one-loop electroweak corrections are calculated within the
automatic SANC system. Electroweak scheme dependence and the choice of the
factorization scale are discussed. Comparisons with earlier calculations are
presented.
| [
{
"created": "Sat, 11 Jun 2005 07:37:43 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Jan 2006 12:24:56 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Arbuzov",
"A.",
""
],
[
"Bardin",
"D.",
""
],
[
"Bondarenko",
"S.",
""
],
[
"Christova",
"P.",
""
],
[
"Kalinovskaya",
"L.",
""
],
[
"Nanava",
"G.",
""
],
[
"Sadykov",
"R.",
""
]
] | Radiative corrections to the charged current Drell-Yan processes are revisited. Complete one-loop electroweak corrections are calculated within the automatic SANC system. Electroweak scheme dependence and the choice of the factorization scale are discussed. Comparisons with earlier calculations are presented. |
2109.07674 | Zhongyi Zhang | Manuel Drees, Meng Shi, Zhongyi Zhang | Machine Learning Optimized Search for the $Z'$ from
$U(1)_{L_\mu-L_\tau}$ at the LHC | 39 pages, 10 figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Extending the Standard Model (SM) by a $U(1)_{L_\mu-L_\tau}$ group gives
potentially significant new contributions to $g_\mu-2$, allows the construction
of realistic neutrino mass matrices, incorporates lepton universality
violation, and offers an anomaly-free mediator for a Dark Matter (DM) sector.
In a recent analysis we showed that published LHC searches are not very
sensitive to this model. Here we apply several Machine Learning (ML) algorithms
in order to distinguish this model from the SM using simulated LHC data. In
particular, we optimize the $3\mu$-signal, which has a considerably larger
cross section than the $4\mu$-signal. Furthermore, since the $2$-muon plus
missing $E_T$ final state gets contributions from diagrams involving DM
particles, we optimize it as well. We find greatly improved sensitivity, which
already for $36$ fb$^{-1}$ of data exceeds the combination of published LHC and
non-LHC results. We also emphasize the usefulness of Boosted Decision Trees
which, unlike Neural Networks, easily allow to extract additional information
from the data which directly connect to the theoretical model through feature
importance. The same scheme could be used to analyze other models.
| [
{
"created": "Thu, 16 Sep 2021 02:33:07 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Feb 2022 00:27:21 GMT",
"version": "v2"
}
] | 2022-02-18 | [
[
"Drees",
"Manuel",
""
],
[
"Shi",
"Meng",
""
],
[
"Zhang",
"Zhongyi",
""
]
] | Extending the Standard Model (SM) by a $U(1)_{L_\mu-L_\tau}$ group gives potentially significant new contributions to $g_\mu-2$, allows the construction of realistic neutrino mass matrices, incorporates lepton universality violation, and offers an anomaly-free mediator for a Dark Matter (DM) sector. In a recent analysis we showed that published LHC searches are not very sensitive to this model. Here we apply several Machine Learning (ML) algorithms in order to distinguish this model from the SM using simulated LHC data. In particular, we optimize the $3\mu$-signal, which has a considerably larger cross section than the $4\mu$-signal. Furthermore, since the $2$-muon plus missing $E_T$ final state gets contributions from diagrams involving DM particles, we optimize it as well. We find greatly improved sensitivity, which already for $36$ fb$^{-1}$ of data exceeds the combination of published LHC and non-LHC results. We also emphasize the usefulness of Boosted Decision Trees which, unlike Neural Networks, easily allow to extract additional information from the data which directly connect to the theoretical model through feature importance. The same scheme could be used to analyze other models. |
hep-ph/9508363 | null | Zhenjun Xiao and Xuelei Wang | Pseudo-Goldstone Bosons in Technicolor Models and the Phenomenology | 31 pages, latex, no macros, 2 figures, hard copies are available upon
request. Invited talk Given at CCAST Seminar of Precision Test of the
Standard Model and Superhigh Energy Physics, Beijing, P.R.China, April 18 to
May 17, 1995; to appear in the Proceedings | null | null | HNU-TH-95/16 | hep-ph | null | In this report we present a review of recent developments in the TC/ETC
theories, concentrating on the theoretical estimations and the phenomenological
analysis about the Non-Oblique corrections on the $Zb\overline{b}$ vertex from
ETC dynamics and Pseudo-Goldstone Bosons. The relevant studies about the vertex
corrections on other processes from the PGBs were also considered.
| [
{
"created": "Thu, 24 Aug 1995 13:32:50 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Xiao",
"Zhenjun",
""
],
[
"Wang",
"Xuelei",
""
]
] | In this report we present a review of recent developments in the TC/ETC theories, concentrating on the theoretical estimations and the phenomenological analysis about the Non-Oblique corrections on the $Zb\overline{b}$ vertex from ETC dynamics and Pseudo-Goldstone Bosons. The relevant studies about the vertex corrections on other processes from the PGBs were also considered. |
1505.07764 | Wolfgang Hollik | Wolfgang Gregor Hollik | Neutrinos Meet Supersymmetry: Quantum Aspects of of Neutrinophysics in
Supersymmetric Theories | PhD thesis; contains results of arXiv:1412.4585, arXiv:1411.3549 and
arXiv:1407.2814 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address the influence of quantum corrections to neutrino masses and
mixings and discuss the possibilities to completely generate the flavor mixing
irrespective of any tree-level flavor model. Furthermore, we describe a new
class of vacua with a new minimum appearing in the standard Higgs direction.
The results hint towards a charge and color breaking global minimum and
therefore extend existing bounds at tree-level. Finally, we combine the
discussion of vacuum stability in the MSSM with the right-handed neutrino
extension. The supersymmetric version of the seesaw mechanism rescues the
potential and also does not induce further instabilities neither at the SUSY
scale nor at the scale of heavy neutrinos, as long as both scales are well
separated. Moreover, we resolve a degeneracy in name space.
| [
{
"created": "Thu, 28 May 2015 17:29:31 GMT",
"version": "v1"
}
] | 2015-05-29 | [
[
"Hollik",
"Wolfgang Gregor",
""
]
] | We address the influence of quantum corrections to neutrino masses and mixings and discuss the possibilities to completely generate the flavor mixing irrespective of any tree-level flavor model. Furthermore, we describe a new class of vacua with a new minimum appearing in the standard Higgs direction. The results hint towards a charge and color breaking global minimum and therefore extend existing bounds at tree-level. Finally, we combine the discussion of vacuum stability in the MSSM with the right-handed neutrino extension. The supersymmetric version of the seesaw mechanism rescues the potential and also does not induce further instabilities neither at the SUSY scale nor at the scale of heavy neutrinos, as long as both scales are well separated. Moreover, we resolve a degeneracy in name space. |
1001.0104 | Alexander Snigirev | A.M. Snigirev | Possible indication to the QCD evolution of double parton distributions? | 5 pages, 1 figure, revtex4, Clarifications, Ref. added, Fig. redrawn,
accepted in Phys. Rev. D | Phys.Rev.D81:065014,2010 | 10.1103/PhysRevD.81.065014 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For the first time the process-independent parameter of double parton
scattering, $\sigma_{\rm eff}^{\rm exp}$, has been measured newly in the D0
experiment at the three different resolution scales.If we interpret the
measurement as a decrease of the effective cross section with a growth of the
resolution scale it can indicate the QCD evolution of double parton
distributions.
| [
{
"created": "Thu, 31 Dec 2009 08:09:24 GMT",
"version": "v1"
},
{
"created": "Sat, 9 Jan 2010 10:04:41 GMT",
"version": "v2"
},
{
"created": "Fri, 5 Feb 2010 11:31:25 GMT",
"version": "v3"
}
] | 2010-04-29 | [
[
"Snigirev",
"A. M.",
""
]
] | For the first time the process-independent parameter of double parton scattering, $\sigma_{\rm eff}^{\rm exp}$, has been measured newly in the D0 experiment at the three different resolution scales.If we interpret the measurement as a decrease of the effective cross section with a growth of the resolution scale it can indicate the QCD evolution of double parton distributions. |
2204.06948 | Priyanka Lamba | Mathew Thomas Arun, Priyanka Lamba, and Sudhir K. Vempati | Restricting $q^2 l^2$ operators from $\pi^0 \rightarrow \mu e$ | 21 pages, 1 figure | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper we consider semileptonic lepton flavor violating operators of
the type $q^2l^2$ in low energy effective theory (LEFT). At the chiral scale,
we match these operators to chiral perturbation theory ($\chi$PT) and place
constraints from the process $\pi^0\rightarrow \mu^+ \,\, e^-$. These bounds
are shown to depend on the chiral nature of the operators. The scalar operators
are significantly more constrained compared to the vector operators. We then
compare the limits from $\mu \to e$ conversion in Nuclei and show that the
limits on scalar operators are within an order of magnitude of the
corresponding limits from $\mu \to e$ conversion in Ti. On the other hand, the
limits on vector operators are however much weaker. Towards the end, we evolve
the LEFT operators to W-boson mass scale using RGE, and match them to the
Standard Model effective field theory (SMEFT) operators. We, then, derive the
constraints on the parameter space of Leptoquark models that could generate
these SMEFT operators at tree level.
| [
{
"created": "Thu, 14 Apr 2022 13:19:08 GMT",
"version": "v1"
}
] | 2022-04-15 | [
[
"Arun",
"Mathew Thomas",
""
],
[
"Lamba",
"Priyanka",
""
],
[
"Vempati",
"Sudhir K.",
""
]
] | In this paper we consider semileptonic lepton flavor violating operators of the type $q^2l^2$ in low energy effective theory (LEFT). At the chiral scale, we match these operators to chiral perturbation theory ($\chi$PT) and place constraints from the process $\pi^0\rightarrow \mu^+ \,\, e^-$. These bounds are shown to depend on the chiral nature of the operators. The scalar operators are significantly more constrained compared to the vector operators. We then compare the limits from $\mu \to e$ conversion in Nuclei and show that the limits on scalar operators are within an order of magnitude of the corresponding limits from $\mu \to e$ conversion in Ti. On the other hand, the limits on vector operators are however much weaker. Towards the end, we evolve the LEFT operators to W-boson mass scale using RGE, and match them to the Standard Model effective field theory (SMEFT) operators. We, then, derive the constraints on the parameter space of Leptoquark models that could generate these SMEFT operators at tree level. |
hep-ph/0210130 | Maria E. Tejeda-Yeomans | George Sterman and Maria E. Tejeda-Yeomans (SUNY, Stony Brook) | Multi-loop Amplitudes and Resummation | 14 pages, LateX2e using elsart.cls (included). Typographical errors
corrected and expansion in renormalized coupling clarified. Thanks added to
Z. Bern and L. Dixon for critical readings of the original version | Phys.Lett.B552:48-56,2003 | 10.1016/S0370-2693(02)03100-3 | YITP-SB-02-56 | hep-ph | null | We explore the relation between resummation and explicit multi-loop
calculations for QCD hard-scattering amplitudes. We describe how the
factorization properties of amplitudes lead to the exponentiation of double and
single poles at each order of perturbation theory. For these amplitudes,
previously-observed relations between single and double poles in different 2 to
2 processes can now be interpreted in terms of universal functions associated
with external partons and process-dependent anomalous dimensions that describe
coherent soft radiation. Catani's proposal for multiple poles in
dimensionally-continued amplitudes emerges naturally.
| [
{
"created": "Tue, 8 Oct 2002 18:29:37 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Oct 2002 20:46:56 GMT",
"version": "v2"
},
{
"created": "Wed, 6 Apr 2005 17:23:55 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Sterman",
"George",
"",
"SUNY, Stony Brook"
],
[
"Tejeda-Yeomans",
"Maria E.",
"",
"SUNY, Stony Brook"
]
] | We explore the relation between resummation and explicit multi-loop calculations for QCD hard-scattering amplitudes. We describe how the factorization properties of amplitudes lead to the exponentiation of double and single poles at each order of perturbation theory. For these amplitudes, previously-observed relations between single and double poles in different 2 to 2 processes can now be interpreted in terms of universal functions associated with external partons and process-dependent anomalous dimensions that describe coherent soft radiation. Catani's proposal for multiple poles in dimensionally-continued amplitudes emerges naturally. |
hep-ph/0508238 | Bernd Kniehl | Bernd A. Kniehl, Anatoly V. Kotikov | Calculating four-loop tadpoles with one non-zero mass | 12 pages, 3 figures | Phys.Lett. B638 (2006) 531-537 | 10.1016/j.physletb.2006.04.057 | DESY 05-153 | hep-ph | null | An efficient method to calculate tadpole diagrams is proposed. Its capability
is demonstrated by analytically evaluating two four-loop tadpole diagrams of
current interest in the literature, including their $O(\epsilon)$ terms in
$D=4-2\epsilon$ space-time dimensions.
| [
{
"created": "Tue, 23 Aug 2005 09:34:32 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jul 2006 18:39:49 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Kniehl",
"Bernd A.",
""
],
[
"Kotikov",
"Anatoly V.",
""
]
] | An efficient method to calculate tadpole diagrams is proposed. Its capability is demonstrated by analytically evaluating two four-loop tadpole diagrams of current interest in the literature, including their $O(\epsilon)$ terms in $D=4-2\epsilon$ space-time dimensions. |
1201.1236 | Marek G\'o\'zd\'z | Marek G\'o\'zd\'z and W. A. Kami\'nski | Suppression of $0\nu 2\beta$ Decay from CP Violation | I've decided to move the collection of my papers to arXiv for easier
access. Proceedings of the Nuclear Physics Workshop in Kazimierz Dolny,
Poland, 2006 | Int. J. Mod. Phys. E 16 (2007) 561 | 10.1142/S0218301307005995 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observed phenomenon of neutrino oscillations is interpreted as the proof
that neutrinos must have mass. As this is true for the neutrinos in the mass
basis, the mass matrix in the flavor (weak) basis may still contain zeros. This
can happen if the CP violating phases, usually neglected, come into play and
result in suppression of processes which half-life depends on the masses of
$\nu_e$, $\nu_\mu$, or $\nu_\tau$. In the present paper we investigate the
possibility of such suppression of the neutrinoless double beta decay
($0\nu2\beta$).
| [
{
"created": "Thu, 5 Jan 2012 18:00:27 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Góźdź",
"Marek",
""
],
[
"Kamiński",
"W. A.",
""
]
] | The observed phenomenon of neutrino oscillations is interpreted as the proof that neutrinos must have mass. As this is true for the neutrinos in the mass basis, the mass matrix in the flavor (weak) basis may still contain zeros. This can happen if the CP violating phases, usually neglected, come into play and result in suppression of processes which half-life depends on the masses of $\nu_e$, $\nu_\mu$, or $\nu_\tau$. In the present paper we investigate the possibility of such suppression of the neutrinoless double beta decay ($0\nu2\beta$). |
2312.15518 | Jin-Wen Kang | Jin-Wen Kang, Sa Wang, Lei Wang, Ben-Wei Zhang | Phenomenological study of the angle between jet axes in heavy-ion
collisions | 8 pages, 7 figures | null | null | null | hep-ph hep-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | This paper presents a phenomenological study on the angle between the
Standard and the Winner-Take-All (WTA) jet axes ($\Delta R_{{\rm axis}}^{{\rm
WTA-Std}}$) in high-energy nuclear collisions. The $p$+$p$ baseline is provided
by the Pythia8 event generator. The in-medium jet propagation is simulated by
the linear Boltzmann transport (LBT) model, which considers both the elastic
and inelastic jet-medium interactions. Our theoretical results calculated by
the LBT model show that the $\Delta R_{{\rm axis}}^{{\rm WTA-Std}}$
distribution in Pb+Pb at $\sqrt{s}=5.02$ TeV is narrower than that in $p$+$p$,
which agrees well with the recent ALICE measurements. The narrowing of $\Delta
R_{{\rm axis}}^{{\rm WTA-Std}}$ seems to violate the $p_T$-broadening nature of
the jet quenching effect, usually explained by the influence of "selection
bias". However, the physical details still need to be fully understood.
Utilizing a matching-jet method to track the jet evolution in the QGP to remove
the selection bias in the Monte Carlo simulations, we observe that the $\Delta
R_{{\rm axis}}^{{\rm WTA-Std}}$ distribution becomes broader due to the
jet-medium interactions. At the same time, by rescaling the quark/gluon-jet
fractions in Pb+Pb collisions to be the same as that in $p$+$p$, we find that
the fraction change may not significantly influence the modification pattern of
jet $\Delta R_{{\rm axis}}^{{\rm WTA-Std}}$. On the other hand, the selected
jet sample in A+A collisions has a significantly narrower initial $\Delta
R_{{\rm axis}}^{{\rm WTA-Std}}$ distribution than the $p$+$p$ baseline, and
such a biased comparison between $p$+$p$ and A+A conceals the actual
jet-broadening effect in the experimental measurements. The investigations
presented in this paper will deepen our understanding of the relationship
between the actual intra-jet modifications in the QGP and the experimental
observations.
| [
{
"created": "Sun, 24 Dec 2023 16:03:23 GMT",
"version": "v1"
}
] | 2023-12-27 | [
[
"Kang",
"Jin-Wen",
""
],
[
"Wang",
"Sa",
""
],
[
"Wang",
"Lei",
""
],
[
"Zhang",
"Ben-Wei",
""
]
] | This paper presents a phenomenological study on the angle between the Standard and the Winner-Take-All (WTA) jet axes ($\Delta R_{{\rm axis}}^{{\rm WTA-Std}}$) in high-energy nuclear collisions. The $p$+$p$ baseline is provided by the Pythia8 event generator. The in-medium jet propagation is simulated by the linear Boltzmann transport (LBT) model, which considers both the elastic and inelastic jet-medium interactions. Our theoretical results calculated by the LBT model show that the $\Delta R_{{\rm axis}}^{{\rm WTA-Std}}$ distribution in Pb+Pb at $\sqrt{s}=5.02$ TeV is narrower than that in $p$+$p$, which agrees well with the recent ALICE measurements. The narrowing of $\Delta R_{{\rm axis}}^{{\rm WTA-Std}}$ seems to violate the $p_T$-broadening nature of the jet quenching effect, usually explained by the influence of "selection bias". However, the physical details still need to be fully understood. Utilizing a matching-jet method to track the jet evolution in the QGP to remove the selection bias in the Monte Carlo simulations, we observe that the $\Delta R_{{\rm axis}}^{{\rm WTA-Std}}$ distribution becomes broader due to the jet-medium interactions. At the same time, by rescaling the quark/gluon-jet fractions in Pb+Pb collisions to be the same as that in $p$+$p$, we find that the fraction change may not significantly influence the modification pattern of jet $\Delta R_{{\rm axis}}^{{\rm WTA-Std}}$. On the other hand, the selected jet sample in A+A collisions has a significantly narrower initial $\Delta R_{{\rm axis}}^{{\rm WTA-Std}}$ distribution than the $p$+$p$ baseline, and such a biased comparison between $p$+$p$ and A+A conceals the actual jet-broadening effect in the experimental measurements. The investigations presented in this paper will deepen our understanding of the relationship between the actual intra-jet modifications in the QGP and the experimental observations. |
1511.00935 | Girish Kumar | Girish Kumar and Namit Mahajan | Asymmetries and observables for $\Lambda_b\rightarrow \Lambda
\ell^+\ell^-$ | 8 pages, 1 figure | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The semi-leptonic baryonic $b\to s$ decay, $\Lambda_b\rightarrow \Lambda
\ell^+\ell^-$, has been studied and new angular observables and asymmetries
have been proposed which can test the presence of new physics beyond the
standard model.
| [
{
"created": "Tue, 3 Nov 2015 14:53:38 GMT",
"version": "v1"
}
] | 2015-11-04 | [
[
"Kumar",
"Girish",
""
],
[
"Mahajan",
"Namit",
""
]
] | The semi-leptonic baryonic $b\to s$ decay, $\Lambda_b\rightarrow \Lambda \ell^+\ell^-$, has been studied and new angular observables and asymmetries have been proposed which can test the presence of new physics beyond the standard model. |
1510.06550 | Shuichiro Funatsu | Shuichiro Funatsu, Hisaki Hatanaka, Yutaka Hosotani | $H\to Z\gamma$ in the gauge-Higgs unification | 35 pages, 7 figures, typo corrected | Phys. Rev. D 92, 115003 (2015) | 10.1103/PhysRevD.92.115003 | OU-HET 872, KIAS-P15044 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The decay rate of the Higgs decay $H \to Z \gamma$ is evaluated at the
one-loop level in the $SO(5)\times U(1)$ gauge-Higgs unification. Although an
infinite number of loops with Kaluza-Klein states contribute to the decay
amplitude, there appears the cancellation among the loops, and the decay rate
is found to be finite and non-zero. It is found that the decay rate is well
approximated by the decay rate in the standard model multiplied by
$\cos^2\theta_H$, where $\theta_H$ is the Aharonov-Bohm phase induced by the
vacuum expectation value of an extra-dimensional component of the gauge field.
| [
{
"created": "Thu, 22 Oct 2015 09:42:54 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Dec 2015 12:56:46 GMT",
"version": "v2"
},
{
"created": "Sat, 3 Sep 2016 20:09:12 GMT",
"version": "v3"
}
] | 2016-09-06 | [
[
"Funatsu",
"Shuichiro",
""
],
[
"Hatanaka",
"Hisaki",
""
],
[
"Hosotani",
"Yutaka",
""
]
] | The decay rate of the Higgs decay $H \to Z \gamma$ is evaluated at the one-loop level in the $SO(5)\times U(1)$ gauge-Higgs unification. Although an infinite number of loops with Kaluza-Klein states contribute to the decay amplitude, there appears the cancellation among the loops, and the decay rate is found to be finite and non-zero. It is found that the decay rate is well approximated by the decay rate in the standard model multiplied by $\cos^2\theta_H$, where $\theta_H$ is the Aharonov-Bohm phase induced by the vacuum expectation value of an extra-dimensional component of the gauge field. |
hep-ph/9611406 | Nicolas Pott | Oliver Baer, Nicolas Pott (TU Munich) | 1/m_b^2 correction to the left-right lepton polarization asymmetry in
the decay B -> X_s mu^+ mu^- | 8 pages, 2 figures included. Uses epsf.sty and rotate.sty. To appear
in Physical Review D. The complete postscript file is also available from URL
ftp://feynman.t30.physik.tu-muenchen.de/pub/preprints/ tum_t31_98_96.ps.gz | Phys.Rev.D55:1684-1687,1997 | 10.1103/PhysRevD.55.1684 | TUM-T31-98/96 | hep-ph | null | Using a known result by Falk et al. for the 1/m_b^2 correction to the
dilepton invariant mass spectrum in the decay B \rightarrow X_s \mu^+ \mu^-, we
calculate the 1/m_b^2 correction to the left-right muon polarization asymmetry
in this decay. Employing an up-to-date range of values for the non-perturbative
parameter \lambda_1, we find that the correction is much smaller than it should
have been expected from the previous work by Falk et al.
| [
{
"created": "Mon, 25 Nov 1996 09:26:10 GMT",
"version": "v1"
}
] | 2011-01-27 | [
[
"Baer",
"Oliver",
"",
"TU Munich"
],
[
"Pott",
"Nicolas",
"",
"TU Munich"
]
] | Using a known result by Falk et al. for the 1/m_b^2 correction to the dilepton invariant mass spectrum in the decay B \rightarrow X_s \mu^+ \mu^-, we calculate the 1/m_b^2 correction to the left-right muon polarization asymmetry in this decay. Employing an up-to-date range of values for the non-perturbative parameter \lambda_1, we find that the correction is much smaller than it should have been expected from the previous work by Falk et al. |
1707.08965 | Raymond Co | Raymond T. Co and Keisuke Harigaya | Gravitino Production Suppressed by Dynamics of Sgoldstino | 23 pages, 3 figures; v2: discussions added and one figure updated,
matches version published in JHEP | JHEP 1710 (2017) 207 | 10.1007/JHEP10(2017)207 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In supersymmetric theories, the gravitino is abundantly produced in the early
Universe from thermal scattering, resulting in a strong upper bound on the
reheat temperature after inflation. We point out that the gravitino problem may
be absent or very mild due to the early dynamics of a supersymmetry breaking
field, i.e. a sgoldstino. In models of low scale mediation, the field value of
the sgoldstino determines the mediation scale and is in general different in
the early Universe from the present one. A large initial field value since the
era of the inflationary reheating suppresses the gravitino production
significantly. We investigate in detail the cosmological evolution of the
sgoldstino and show that the reheat temperature may be much higher than the
conventional upper bound, restoring the compatibility with thermal
leptogenesis.
| [
{
"created": "Thu, 27 Jul 2017 18:00:01 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Nov 2017 20:39:27 GMT",
"version": "v2"
}
] | 2017-11-22 | [
[
"Co",
"Raymond T.",
""
],
[
"Harigaya",
"Keisuke",
""
]
] | In supersymmetric theories, the gravitino is abundantly produced in the early Universe from thermal scattering, resulting in a strong upper bound on the reheat temperature after inflation. We point out that the gravitino problem may be absent or very mild due to the early dynamics of a supersymmetry breaking field, i.e. a sgoldstino. In models of low scale mediation, the field value of the sgoldstino determines the mediation scale and is in general different in the early Universe from the present one. A large initial field value since the era of the inflationary reheating suppresses the gravitino production significantly. We investigate in detail the cosmological evolution of the sgoldstino and show that the reheat temperature may be much higher than the conventional upper bound, restoring the compatibility with thermal leptogenesis. |
1711.10779 | Kenji Morita | Kenji Morita, Chihiro Sasaki, Pok Man Lo, Krzysztof Redlich | Overlap between Lattice QCD and HRG with in-medium effects and parity
doubling | 9 pages, 5 figures. To appear in Proceedings of Strangeness in Quark
Matter 2017 | null | 10.1051/epjconf/201817105001 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the fluctuations and correlations involving baryon number in
hot hadronic matter with modified masses of negative-parity baryons, in the
context of the hadron resonance gas. Temperature-dependent masses are adopted
from the recent lattice QCD results and from a chiral effective model which
implements the parity doubling structure with respect to the chiral symmetry.
Confronting the baryon number susceptibility, baryon-charge correlation, and
baryon-strangeness correlation and their ratios with the lattice QCD data, we
show that the strong downward mass shift in hyperons can accidentally reproduce
some correlation ratios, however it also tends to overshoot the individual
fluctuations and correlations. This indicates, that in order to correctly
account for the influence of the chiral symmetry restoration on the fluctuation
observables, a consistent framework of in-medium effects beyond hadron mass
shifts is required.
| [
{
"created": "Wed, 29 Nov 2017 11:28:24 GMT",
"version": "v1"
}
] | 2018-03-14 | [
[
"Morita",
"Kenji",
""
],
[
"Sasaki",
"Chihiro",
""
],
[
"Lo",
"Pok Man",
""
],
[
"Redlich",
"Krzysztof",
""
]
] | We investigate the fluctuations and correlations involving baryon number in hot hadronic matter with modified masses of negative-parity baryons, in the context of the hadron resonance gas. Temperature-dependent masses are adopted from the recent lattice QCD results and from a chiral effective model which implements the parity doubling structure with respect to the chiral symmetry. Confronting the baryon number susceptibility, baryon-charge correlation, and baryon-strangeness correlation and their ratios with the lattice QCD data, we show that the strong downward mass shift in hyperons can accidentally reproduce some correlation ratios, however it also tends to overshoot the individual fluctuations and correlations. This indicates, that in order to correctly account for the influence of the chiral symmetry restoration on the fluctuation observables, a consistent framework of in-medium effects beyond hadron mass shifts is required. |
hep-ph/9206233 | Dave Bennett | David P. Bennett, Albert Stebbins, and Francois R. Bouchet | The Implications of the COBE-DMR Results for Cosmic Strings | 8 pages, 1 figure (included). UCRL-JC-110803 | Astrophys.J.399:L5-L8,1992 | 10.1086/186592 | null | hep-ph astro-ph | null | We compare the anisotropies in the cosmic microwave background radiation
measured by the COBE experiment to the predictions of cosmic strings. We use an
analytic model for the $\Delta T/T$ power spectrum that is based on our
previous numerical simulations to show that the COBE results imply a value for
the string mass per unit length, $\mu$ under the assumption that cosmic strings
are the source of the measured anisotropy. We find $G\mu = 1.5\pm 0.5 \times
10^{-6}$ which is consistent with the value of $\mu$ thought to be required for
cosmic strings to seed galaxy formation.
| [
{
"created": "Thu, 18 Jun 1992 23:32:58 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Bennett",
"David P.",
""
],
[
"Stebbins",
"Albert",
""
],
[
"Bouchet",
"Francois R.",
""
]
] | We compare the anisotropies in the cosmic microwave background radiation measured by the COBE experiment to the predictions of cosmic strings. We use an analytic model for the $\Delta T/T$ power spectrum that is based on our previous numerical simulations to show that the COBE results imply a value for the string mass per unit length, $\mu$ under the assumption that cosmic strings are the source of the measured anisotropy. We find $G\mu = 1.5\pm 0.5 \times 10^{-6}$ which is consistent with the value of $\mu$ thought to be required for cosmic strings to seed galaxy formation. |
hep-ph/9601201 | null | J.Bartels, J.R.Forshaw, H.Lotter, M.Wusthoff | Diffractive Production of Vector Mesons at Large t | 13 pages plus 3 figures (uuencoded) | Phys.Lett.B375:301-309,1996 | 10.1016/0370-2693(96)00203-1 | DESY-95-253, MC-TH-95/23, ANL-HEP-PR-95-89 | hep-ph | null | The cross section for elastic vector meson production in photon-proton
interactions at large $t$ is considered using the exact analytic solution of
the BFKL equation in the azimuthally symmetric $n=0$ limit. We use a
non-relativistic model for the vector meson production and find a small
shrinkage in the $t$-distribution with increasing energy.
| [
{
"created": "Tue, 2 Jan 1996 14:03:54 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bartels",
"J.",
""
],
[
"Forshaw",
"J. R.",
""
],
[
"Lotter",
"H.",
""
],
[
"Wusthoff",
"M.",
""
]
] | The cross section for elastic vector meson production in photon-proton interactions at large $t$ is considered using the exact analytic solution of the BFKL equation in the azimuthally symmetric $n=0$ limit. We use a non-relativistic model for the vector meson production and find a small shrinkage in the $t$-distribution with increasing energy. |
1408.0222 | Alexander Lenz | Alexander Lenz, David Hodges, Daniel Hulme, Sandra Kvedaraite, Jack
Richings, Jian Shen Woo and Philip Waite | Investigating bounds on decoherence in quantum mechanics via B and
D-mixing | 10 pages, Reference added, agrees with the published version in Nucl.
Phys. B | Nuclear Physics B 888 (2014) 129-136 | 10.1016/j.nuclphysb.2014.09.007 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate bounds on decoherence in quantum mechanics by studying $B$ and
$D$-mixing observables, making use of many precise new measurements,
particularly from the LHC and B factories. In that respect we show that the
stringent bounds obtained by a different group in 2013 rely on unjustified
assumptions. Finally, we point out which experimental measurements could
improve the decoherence bounds considerably.
| [
{
"created": "Fri, 1 Aug 2014 16:21:57 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Oct 2014 12:47:23 GMT",
"version": "v2"
}
] | 2016-05-03 | [
[
"Lenz",
"Alexander",
""
],
[
"Hodges",
"David",
""
],
[
"Hulme",
"Daniel",
""
],
[
"Kvedaraite",
"Sandra",
""
],
[
"Richings",
"Jack",
""
],
[
"Woo",
"Jian Shen",
""
],
[
"Waite",
"Philip",
""
]
] | We investigate bounds on decoherence in quantum mechanics by studying $B$ and $D$-mixing observables, making use of many precise new measurements, particularly from the LHC and B factories. In that respect we show that the stringent bounds obtained by a different group in 2013 rely on unjustified assumptions. Finally, we point out which experimental measurements could improve the decoherence bounds considerably. |
2002.07610 | Luis Roca | Guan-Ying Wang, Luis Roca, En Wang, Wei-Hong Liang, Eulogio Oset | Signatures of the two $K_1(1270)$ poles in $D^+\to \nu e^+ V P$ decay | 7 pages, 3 figures | null | 10.1140/epjc/s10052-020-7939-1 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze theoretically the $D^+\to \nu e^+ \rho \bar K$ and $D^+\to \nu e^+
\bar K^* \pi$ decays to see the feasibility to check the double pole nature of
the axial-vector resonance $K_1(1270)$ predicted by the unitary extensions of
chiral perturbation theory (UChPT). Indeed, within UChPT the $K_1(1270)$ is
dynamically generated from the interaction of a vector and a pseudoscalar
meson, and two poles are obtained for the quantum numbers of this resonance.
The lower mass pole couples dominantly to $K^*\pi$ and the higher mass pole to
$\rho K$, therefore we can expect that different reactions weighing differently
these channels in the production mechanisms enhance one or the other pole. We
show that the different final $VP$ channels in $D^+\to \nu e^+ V P$ weigh
differently both poles, and this is reflected in the shape of the final
vector-pseudoscalar invariant mass distributions. Therefore, we conclude that
these decays are suitable to distinguish experimentally the predicted double
pole of the $K_1(1270)$ resonance.
| [
{
"created": "Tue, 18 Feb 2020 14:51:46 GMT",
"version": "v1"
}
] | 2020-06-24 | [
[
"Wang",
"Guan-Ying",
""
],
[
"Roca",
"Luis",
""
],
[
"Wang",
"En",
""
],
[
"Liang",
"Wei-Hong",
""
],
[
"Oset",
"Eulogio",
""
]
] | We analyze theoretically the $D^+\to \nu e^+ \rho \bar K$ and $D^+\to \nu e^+ \bar K^* \pi$ decays to see the feasibility to check the double pole nature of the axial-vector resonance $K_1(1270)$ predicted by the unitary extensions of chiral perturbation theory (UChPT). Indeed, within UChPT the $K_1(1270)$ is dynamically generated from the interaction of a vector and a pseudoscalar meson, and two poles are obtained for the quantum numbers of this resonance. The lower mass pole couples dominantly to $K^*\pi$ and the higher mass pole to $\rho K$, therefore we can expect that different reactions weighing differently these channels in the production mechanisms enhance one or the other pole. We show that the different final $VP$ channels in $D^+\to \nu e^+ V P$ weigh differently both poles, and this is reflected in the shape of the final vector-pseudoscalar invariant mass distributions. Therefore, we conclude that these decays are suitable to distinguish experimentally the predicted double pole of the $K_1(1270)$ resonance. |
0704.1724 | Marco Ruggieri | M. Ruggieri | Inhomogeneous color superconductivity and the cooling of compact stars | 4 pages, 1 figure, uses aiproc style. Talk given at "Quark
confinement and the hadron spectrum", Ponta Delgada, Acores, Portugal, 2-7
September 2006 | AIPConf.Proc.892:495-498,2007 | 10.1063/1.2714452 | null | hep-ph | null | In this talk I discuss the inhomogeneous (LOFF) color superconductive phases
of Quantum Chromodynamics (QCD). In particular, I show the effect of a core of
LOFF phase on the cooling of a compact star.
| [
{
"created": "Fri, 13 Apr 2007 09:28:14 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ruggieri",
"M.",
""
]
] | In this talk I discuss the inhomogeneous (LOFF) color superconductive phases of Quantum Chromodynamics (QCD). In particular, I show the effect of a core of LOFF phase on the cooling of a compact star. |
0801.1826 | Michelangelo Mangano | M. Raidal, A. van der Schaaf, I. Bigi, M.L. Mangano, Y. Semertzidis,
S. Abel, S. Albino, S. Antusch, E. Arganda, B. Bajc, S. Banerjee, C. Biggio,
M. Blanke, W. Bonivento, G.C. Branco, D. Bryman, A.J. Buras, L. Calibbi, A.
Ceccucci, P.H. Chankowski, S. Davidson, A. Deandrea, D.P. DeMille, F.
Deppisch, M. Diaz, B. Duling, M. Felcini, W. Fetscher, D.K. Ghosh, M.
Giffels, G. Giudice, E. Goudzovskij, T. Han, P.G. Harris, M.J. Herrero, J.
Hisano, R.J. Holt, K. Huitu, A. Ibarra, O. Igonkina, A. Ilakovac, J. Imazato,
G. Isidori, F.R. Joaquim, M. Kadastik, Y. Kajiyama, S.F. King, K. Kirch, M.G.
Kozlov, M. Krawczyk, T. Kress, O. Lebedev, A. Lusiani, E. Ma, G. Marchiori,
I. Masina, G. Moreau, T. Mori, M. Muntel, F. Nesti, C.J.G. Onderwater, P.
Paradisi, S.T. Petcov, M. Picariello, V. Porretti, A. Poschenrieder, M.
Pospelov, L. Rebane, M.N. Rebelo, A. Ritz, L. Roberts, A. Romanino, A. Rossi,
R. Rueckl, G. Senjanovic, N. Serra, T. Shindou, Y. Takanishi, C. Tarantino,
A.M. Teixeira, E. Torrente-Lujan, K.J. Turzynski, T.E.J. Underwood, S.K.
Vempati, O. Vives | Flavour physics of leptons and dipole moments | Report of Working Group 3 of the CERN Workshop ``Flavour in the era
of the LHC'', Geneva, Switzerland, November 2005 -- March 2007 | Eur.Phys.J.C57:13-182,2008 | 10.1140/epjc/s10052-008-0715-2 | null | hep-ph hep-ex | null | This chapter of the report of the ``Flavour in the era of the LHC'' Workshop
discusses the theoretical, phenomenological and experimental issues related to
flavour phenomena in the charged lepton sector and in flavour-conserving
CP-violating processes. We review the current experimental limits and the main
theoretical models for the flavour structure of fundamental particles. We
analyze the phenomenological consequences of the available data, setting
constraints on explicit models beyond the Standard Model, presenting benchmarks
for the discovery potential of forthcoming measurements both at the LHC and at
low energy, and exploring options for possible future experiments.
| [
{
"created": "Fri, 11 Jan 2008 19:25:25 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Raidal",
"M.",
""
],
[
"van der Schaaf",
"A.",
""
],
[
"Bigi",
"I.",
""
],
[
"Mangano",
"M. L.",
""
],
[
"Semertzidis",
"Y.",
""
],
[
"Abel",
"S.",
""
],
[
"Albino",
"S.",
""
],
[
"Antusch",
"S.",
""
],
[
"Arganda",
"E.",
""
],
[
"Bajc",
"B.",
""
],
[
"Banerjee",
"S.",
""
],
[
"Biggio",
"C.",
""
],
[
"Blanke",
"M.",
""
],
[
"Bonivento",
"W.",
""
],
[
"Branco",
"G. C.",
""
],
[
"Bryman",
"D.",
""
],
[
"Buras",
"A. J.",
""
],
[
"Calibbi",
"L.",
""
],
[
"Ceccucci",
"A.",
""
],
[
"Chankowski",
"P. H.",
""
],
[
"Davidson",
"S.",
""
],
[
"Deandrea",
"A.",
""
],
[
"DeMille",
"D. P.",
""
],
[
"Deppisch",
"F.",
""
],
[
"Diaz",
"M.",
""
],
[
"Duling",
"B.",
""
],
[
"Felcini",
"M.",
""
],
[
"Fetscher",
"W.",
""
],
[
"Ghosh",
"D. K.",
""
],
[
"Giffels",
"M.",
""
],
[
"Giudice",
"G.",
""
],
[
"Goudzovskij",
"E.",
""
],
[
"Han",
"T.",
""
],
[
"Harris",
"P. G.",
""
],
[
"Herrero",
"M. J.",
""
],
[
"Hisano",
"J.",
""
],
[
"Holt",
"R. J.",
""
],
[
"Huitu",
"K.",
""
],
[
"Ibarra",
"A.",
""
],
[
"Igonkina",
"O.",
""
],
[
"Ilakovac",
"A.",
""
],
[
"Imazato",
"J.",
""
],
[
"Isidori",
"G.",
""
],
[
"Joaquim",
"F. R.",
""
],
[
"Kadastik",
"M.",
""
],
[
"Kajiyama",
"Y.",
""
],
[
"King",
"S. F.",
""
],
[
"Kirch",
"K.",
""
],
[
"Kozlov",
"M. G.",
""
],
[
"Krawczyk",
"M.",
""
],
[
"Kress",
"T.",
""
],
[
"Lebedev",
"O.",
""
],
[
"Lusiani",
"A.",
""
],
[
"Ma",
"E.",
""
],
[
"Marchiori",
"G.",
""
],
[
"Masina",
"I.",
""
],
[
"Moreau",
"G.",
""
],
[
"Mori",
"T.",
""
],
[
"Muntel",
"M.",
""
],
[
"Nesti",
"F.",
""
],
[
"Onderwater",
"C. J. G.",
""
],
[
"Paradisi",
"P.",
""
],
[
"Petcov",
"S. T.",
""
],
[
"Picariello",
"M.",
""
],
[
"Porretti",
"V.",
""
],
[
"Poschenrieder",
"A.",
""
],
[
"Pospelov",
"M.",
""
],
[
"Rebane",
"L.",
""
],
[
"Rebelo",
"M. N.",
""
],
[
"Ritz",
"A.",
""
],
[
"Roberts",
"L.",
""
],
[
"Romanino",
"A.",
""
],
[
"Rossi",
"A.",
""
],
[
"Rueckl",
"R.",
""
],
[
"Senjanovic",
"G.",
""
],
[
"Serra",
"N.",
""
],
[
"Shindou",
"T.",
""
],
[
"Takanishi",
"Y.",
""
],
[
"Tarantino",
"C.",
""
],
[
"Teixeira",
"A. M.",
""
],
[
"Torrente-Lujan",
"E.",
""
],
[
"Turzynski",
"K. J.",
""
],
[
"Underwood",
"T. E. J.",
""
],
[
"Vempati",
"S. K.",
""
],
[
"Vives",
"O.",
""
]
] | This chapter of the report of the ``Flavour in the era of the LHC'' Workshop discusses the theoretical, phenomenological and experimental issues related to flavour phenomena in the charged lepton sector and in flavour-conserving CP-violating processes. We review the current experimental limits and the main theoretical models for the flavour structure of fundamental particles. We analyze the phenomenological consequences of the available data, setting constraints on explicit models beyond the Standard Model, presenting benchmarks for the discovery potential of forthcoming measurements both at the LHC and at low energy, and exploring options for possible future experiments. |
hep-ph/0111179 | John F. Gunion | U. Ellwanger (Lab. Physique), J.F. Gunion (U.C. Davis) and C. Hugonie
(Durham) | Establishing a No-Lose Theorem for NMSSM Higgs Boson Discovery at the
LHC | 20 pages, 3 tables. revisions for final publication included | null | null | UCD-2001-13 | hep-ph | null | We scan the parameter space of the NMSSM for the observability of at least
one Higgs boson at the LHC with $300\fbi$ integrated luminosity, taking the
present LEP2 constraints into account. We restrict the scan to those regions of
parameter space for which Higgs boson decays to other Higgs bosons and/or
supersymmetric particles are kinematically forbidden. We find that if
$WW$-fusion detection modes for a light Higgs boson are not taken into account,
then there are still significant regions in the scanned portion of the NMSSM
parameter space where no Higgs boson can be observed at the $5\sigma$ level,
despite the recent improvements in ATLAS and CMS procedures and techniques and
even if we combine all non-fusion discovery channels. However, if the
$WW$-fusion detection modes are included using the current theoretical study
estimates, then we find that for all scanned points at least one of the NMSSM
Higgs bosons will be detected. If the estimated $300\fbi$ significances for
ATLAS and CMS are combined, one can also achieve $5\sigma$ signals after
combining just the non-$WW$-fusion channels signals. We present the parameters
of several particularly difficult points, and discuss the complementary roles
played by different modes. We conclude that the LHC will discover at least one
NMSSM Higgs boson unless there are large branching ratios for decays to SUSY
particles and/or to other Higgs bosons.
| [
{
"created": "Wed, 14 Nov 2001 19:27:58 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Dec 2001 19:35:57 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Feb 2002 22:58:15 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Ellwanger",
"U.",
"",
"Lab. Physique"
],
[
"Gunion",
"J. F.",
"",
"U.C. Davis"
],
[
"Hugonie",
"C.",
"",
"Durham"
]
] | We scan the parameter space of the NMSSM for the observability of at least one Higgs boson at the LHC with $300\fbi$ integrated luminosity, taking the present LEP2 constraints into account. We restrict the scan to those regions of parameter space for which Higgs boson decays to other Higgs bosons and/or supersymmetric particles are kinematically forbidden. We find that if $WW$-fusion detection modes for a light Higgs boson are not taken into account, then there are still significant regions in the scanned portion of the NMSSM parameter space where no Higgs boson can be observed at the $5\sigma$ level, despite the recent improvements in ATLAS and CMS procedures and techniques and even if we combine all non-fusion discovery channels. However, if the $WW$-fusion detection modes are included using the current theoretical study estimates, then we find that for all scanned points at least one of the NMSSM Higgs bosons will be detected. If the estimated $300\fbi$ significances for ATLAS and CMS are combined, one can also achieve $5\sigma$ signals after combining just the non-$WW$-fusion channels signals. We present the parameters of several particularly difficult points, and discuss the complementary roles played by different modes. We conclude that the LHC will discover at least one NMSSM Higgs boson unless there are large branching ratios for decays to SUSY particles and/or to other Higgs bosons. |
hep-ph/9802432 | Daniel De Florian | D. de Florian (CERN), M. Stratmann (Durham Univ.), W. Vogelsang (CERN) | Polarized Lambda-Baryon Production in pp Collisions | 11 pages, LaTeX, 2 figures, uses epsfig and amssymb styles | Phys.Rev.Lett. 81 (1998) 530-533 | 10.1103/PhysRevLett.81.530 | CERN-TH/98-56, DTP/98/06 | hep-ph | null | We study the production of longitudinally polarized Lambda-baryons in
single-spin pp collisions at RHIC and HERA-N as a means of determining the
spin-dependent Lambda fragmentation functions. It is shown that a measurement
of the rapidity distribution of the Lambda's would provide an excellent way of
clearly discriminating between various recently suggested sets of polarized
Lambda fragmentation functions that are all compatible with present e^+e^-
data. We also address the main theoretical uncertainties, which appear to be
well under control.
| [
{
"created": "Thu, 26 Feb 1998 13:47:27 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"de Florian",
"D.",
"",
"CERN"
],
[
"Stratmann",
"M.",
"",
"Durham Univ."
],
[
"Vogelsang",
"W.",
"",
"CERN"
]
] | We study the production of longitudinally polarized Lambda-baryons in single-spin pp collisions at RHIC and HERA-N as a means of determining the spin-dependent Lambda fragmentation functions. It is shown that a measurement of the rapidity distribution of the Lambda's would provide an excellent way of clearly discriminating between various recently suggested sets of polarized Lambda fragmentation functions that are all compatible with present e^+e^- data. We also address the main theoretical uncertainties, which appear to be well under control. |
hep-ph/9702267 | Sarira Sahu | Sarira Sahu | Neutrino propagation in a random magnetic field | 11 pages | Phys.Rev. D56 (1997) 4378-4383 | 10.1103/PhysRevD.56.4378 | PRL-TH-97 | hep-ph | null | The active-sterile neutrino conversion probability is calculated for neutrino
propagating in a medium in the presence of random magnetic field fluctuations.
Necessary condition for the probability to be positive definite is obtained.
Using this necessary condition we put constraint on the neutrino magnetic
moment from active-sterile electron neutrino conversion in the early universe
hot plasma and in supernova.
| [
{
"created": "Wed, 5 Feb 1997 18:06:57 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Sahu",
"Sarira",
""
]
] | The active-sterile neutrino conversion probability is calculated for neutrino propagating in a medium in the presence of random magnetic field fluctuations. Necessary condition for the probability to be positive definite is obtained. Using this necessary condition we put constraint on the neutrino magnetic moment from active-sterile electron neutrino conversion in the early universe hot plasma and in supernova. |
hep-ph/0001076 | shunzo Kumano | S. Kumano (Saga University) | Flavor asymmetry in polarized proton-deuteron Drell-Yan process | 1+6 pages LATEX, sprocl.sty, amsmath.sty, epsfig.sty, wrapfig.sty, 2
eps figures. Talk at the RCNP-TMU Symposium on "Spins in Nuclear and Hadronic
Reactions", Tokyo, Japan, Oct.26-28, 1999, to be published in proceedings.
Complete postscript file is available at http://www-hs.phys.saga-u.ac.jp
Email: kumanos@cc.saga-u.ac.jp | null | 10.1142/9789812792297_0029 | SAGA-HE-157-00 | hep-ph hep-ex nucl-th | null | We discuss the possibility of finding polarized antiquark flavor asymmetry in
Drell-Yan processes. We find that the difference between polarized
proton-proton and proton-deuteron Drell-Yan cross sections should provide
valuable information on the polarized flavor asymmetry. Numerical results
indicate that the asymmetry effects are conspicuous especially in the large-x_F
region. Our analysis is important for the transversity distributions because
the flavor asymmetry cannot be found by inclusive lepton scattering and
W-production processes.
| [
{
"created": "Tue, 11 Jan 2000 01:44:40 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Kumano",
"S.",
"",
"Saga University"
]
] | We discuss the possibility of finding polarized antiquark flavor asymmetry in Drell-Yan processes. We find that the difference between polarized proton-proton and proton-deuteron Drell-Yan cross sections should provide valuable information on the polarized flavor asymmetry. Numerical results indicate that the asymmetry effects are conspicuous especially in the large-x_F region. Our analysis is important for the transversity distributions because the flavor asymmetry cannot be found by inclusive lepton scattering and W-production processes. |
1602.08105 | Mikko Laine | Seyong Kim, M. Laine | Rapid thermal co-annihilation through bound states in QCD | 26 pages. v3: clarifications and references added | JHEP 1607 (2016) 143 | 10.1007/JHEP07(2016)143 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The co-annihilation rate of heavy particles close to thermal equilibrium,
which plays a role in many classic dark matter scenarios, can be "simulated" in
QCD by considering the pair annihilation rate of a heavy quark and antiquark at
a temperature of a few hundred MeV. We show that the so-called Sommerfeld
factors, parameterizing the rate, can be defined and measured
non-perturbatively within the NRQCD framework. Lattice measurements indicate a
modest suppression in the octet channel, in reasonable agreement with
perturbation theory, and a large enhancement in the singlet channel, much above
the perturbative prediction. The additional enhancement is suggested to
originate from bound state formation and subsequent decay. Making use of a
Green's function based method to incorporate thermal corrections in
perturbative co-annihilation rate computations, we show that qualitative
agreement with lattice data can be found once thermally broadened bound states
are accounted for. We suggest that our formalism may also be applicable to
specific dark matter models which have complicated bound state structures.
| [
{
"created": "Thu, 25 Feb 2016 21:00:26 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Mar 2016 05:24:02 GMT",
"version": "v2"
},
{
"created": "Tue, 2 Aug 2016 06:57:35 GMT",
"version": "v3"
}
] | 2016-08-03 | [
[
"Kim",
"Seyong",
""
],
[
"Laine",
"M.",
""
]
] | The co-annihilation rate of heavy particles close to thermal equilibrium, which plays a role in many classic dark matter scenarios, can be "simulated" in QCD by considering the pair annihilation rate of a heavy quark and antiquark at a temperature of a few hundred MeV. We show that the so-called Sommerfeld factors, parameterizing the rate, can be defined and measured non-perturbatively within the NRQCD framework. Lattice measurements indicate a modest suppression in the octet channel, in reasonable agreement with perturbation theory, and a large enhancement in the singlet channel, much above the perturbative prediction. The additional enhancement is suggested to originate from bound state formation and subsequent decay. Making use of a Green's function based method to incorporate thermal corrections in perturbative co-annihilation rate computations, we show that qualitative agreement with lattice data can be found once thermally broadened bound states are accounted for. We suggest that our formalism may also be applicable to specific dark matter models which have complicated bound state structures. |
hep-ph/0407087 | Sheldon Lee Glashow | Sheldon Lee Glashow | Atmospheric Neutrino Constraints on Lorentz Violation | 3 pages | null | null | null | hep-ph | null | Sensitive tests of Lorentz invariance can emerge from the study of neutrino
oscillations, particularly for atmospheric neutrinos where the effect is
conveniently near-maximal and has been observed over a wide range of energies.
We assume these oscillations to be described in terms of two neutrinos with
different masses and (possibly) different maximal attainable velocities (MAVs).
It suffices to examine limiting cases in which neutrino velocity eigenstates
coincide with either their mass or flavor eigenstates. We display the modified
mu to tau neutrino transition probability for each case. Data on atmospheric
neutrino oscillations at the highest observed energies and pathlengths can
yield constraints on neutrino MAV differences (i.e., tests of special
relativity) more restrictive than any that have been obtained to date on
analogous Lorentz-violating parameters in other sectors of particle physics.
| [
{
"created": "Wed, 7 Jul 2004 15:54:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Glashow",
"Sheldon Lee",
""
]
] | Sensitive tests of Lorentz invariance can emerge from the study of neutrino oscillations, particularly for atmospheric neutrinos where the effect is conveniently near-maximal and has been observed over a wide range of energies. We assume these oscillations to be described in terms of two neutrinos with different masses and (possibly) different maximal attainable velocities (MAVs). It suffices to examine limiting cases in which neutrino velocity eigenstates coincide with either their mass or flavor eigenstates. We display the modified mu to tau neutrino transition probability for each case. Data on atmospheric neutrino oscillations at the highest observed energies and pathlengths can yield constraints on neutrino MAV differences (i.e., tests of special relativity) more restrictive than any that have been obtained to date on analogous Lorentz-violating parameters in other sectors of particle physics. |
1801.05862 | Thomas A. Trainor | Thomas A. Trainor | Glauber-model analysis of 5 TeV $\bf p$-Pb centrality compared to a
two-component (soft + hard) model of hadron production in high-energy nuclear
collisions | 24 pages, 25 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recent study of 5 TeV $p$-Pb centrality combined a Glauber model of $p$-Pb
collision geometry with an assumption of linear scaling between $n_{ch}$
(charge) integrated within some $\eta$ acceptance and the number of nucleon
participants $N_{part}$. The study concluded that $N_{part}$ increases to
nearly 16 in central collisions, and the high-$p_t$ region of $p$-Pb $p_t$
spectra rescaled by the Glauber-estimated number of $p$-N binary collisions
remains consistent with a $p$-$p$ spectrum for the same energy, independent of
$p$-Pb centrality. However, the relation between $N_{part}$ and $n_{ch}$
derived from a two-component (soft + hard) model (TCM) study of ensemble-mean
$\bar p_t$ data for the same system is quite different. This article reports a
detailed analysis of the Glauber study and the question of centrality in $p$-A
collisions. The Glauber centrality model is compared with the $\bar p_t$ TCM to
understand the sources of major differences. The assumption of linear
proportionality between $n_{ch}$ and $N_{part}$ is found to be inconsistent
with $\bar p_t$ data. Properties of the convolution integral relating a
differential cross section and hadron production model to an event distribution
on $n_{ch}$ are examined. An alternative differential-cross-section
distribution is inferred from charge-multiplicity data, and the upper limit on
$N_{part}$ is estimated to be near 8. The TCM centrality model is then applied
to $p_t$ spectrum ratios to predict results for $p$-Pb spectra. The spectrum
TCM is tested with identified-pion spectra from 5 TeV $p$-Pb collisions and the
result is consistent with previous $p$-$p$ TCM results. A TCM prediction that
the spectrum ratio at high $p_t$ should increase to 14 for central $p$-Pb
collisions due to quadratic dependence of dijet production on $n_{ch}$ is
consistent with $\bar p_t$ data from the same system.
| [
{
"created": "Wed, 17 Jan 2018 20:53:17 GMT",
"version": "v1"
}
] | 2018-01-19 | [
[
"Trainor",
"Thomas A.",
""
]
] | A recent study of 5 TeV $p$-Pb centrality combined a Glauber model of $p$-Pb collision geometry with an assumption of linear scaling between $n_{ch}$ (charge) integrated within some $\eta$ acceptance and the number of nucleon participants $N_{part}$. The study concluded that $N_{part}$ increases to nearly 16 in central collisions, and the high-$p_t$ region of $p$-Pb $p_t$ spectra rescaled by the Glauber-estimated number of $p$-N binary collisions remains consistent with a $p$-$p$ spectrum for the same energy, independent of $p$-Pb centrality. However, the relation between $N_{part}$ and $n_{ch}$ derived from a two-component (soft + hard) model (TCM) study of ensemble-mean $\bar p_t$ data for the same system is quite different. This article reports a detailed analysis of the Glauber study and the question of centrality in $p$-A collisions. The Glauber centrality model is compared with the $\bar p_t$ TCM to understand the sources of major differences. The assumption of linear proportionality between $n_{ch}$ and $N_{part}$ is found to be inconsistent with $\bar p_t$ data. Properties of the convolution integral relating a differential cross section and hadron production model to an event distribution on $n_{ch}$ are examined. An alternative differential-cross-section distribution is inferred from charge-multiplicity data, and the upper limit on $N_{part}$ is estimated to be near 8. The TCM centrality model is then applied to $p_t$ spectrum ratios to predict results for $p$-Pb spectra. The spectrum TCM is tested with identified-pion spectra from 5 TeV $p$-Pb collisions and the result is consistent with previous $p$-$p$ TCM results. A TCM prediction that the spectrum ratio at high $p_t$ should increase to 14 for central $p$-Pb collisions due to quadratic dependence of dijet production on $n_{ch}$ is consistent with $\bar p_t$ data from the same system. |
1205.4038 | Bin He | Bin He, Nobuchika Okada and Qaisar Shafi | 125 GeV Higgs, Type III Seesaw and Gauge-Higgs Unification | null | null | 10.1016/j.physletb.2012.08.012 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, both the ATLAS and CMS experiments have observed an excess of
events that could be the first evidence for a 125 GeV Higgs boson. This is a
few GeV below the (absolute) vacuum stability bound on the Higgs mass in the
Standard Model (SM), assuming a Planck mass ultraviolet (UV) cutoff. In this
paper, we study some implications of a 125 GeV Higgs boson for new physics in
terms of the vacuum stability bound. We first consider the seesaw extension of
the SM and find that in type III seesaw, the vacuum stability bound on the
Higgs mass can be as low as 125 GeV for the seesaw scale around a TeV. Next we
dicuss some alternative new physics models which provide an effective
ultraviolet cutoff lower than the Planck mass. An effective cutoff \Lambda
\simeq 10^{11} GeV leads to a vacuum stability bound on the Higgs mass of 125
GeV. In a gauge-Higgs unification scenario with five-dimensional flat
spacetime, the so-called gauge-Higgs condition allows us to predict a Higgs
mass of 125 GeV, with the compactification scale of the extra-dimension being
identified as the cutoff scale \Lambda \simeq 10^{11} GeV. Identifying the
compactification scale with the unification scale of the SM SU(2) gauge
coupling and the top quark Yukawa coupling yields a Higgs mass of 121\pm 2 GeV.
| [
{
"created": "Thu, 17 May 2012 20:13:44 GMT",
"version": "v1"
},
{
"created": "Thu, 31 May 2012 04:52:48 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"He",
"Bin",
""
],
[
"Okada",
"Nobuchika",
""
],
[
"Shafi",
"Qaisar",
""
]
] | Recently, both the ATLAS and CMS experiments have observed an excess of events that could be the first evidence for a 125 GeV Higgs boson. This is a few GeV below the (absolute) vacuum stability bound on the Higgs mass in the Standard Model (SM), assuming a Planck mass ultraviolet (UV) cutoff. In this paper, we study some implications of a 125 GeV Higgs boson for new physics in terms of the vacuum stability bound. We first consider the seesaw extension of the SM and find that in type III seesaw, the vacuum stability bound on the Higgs mass can be as low as 125 GeV for the seesaw scale around a TeV. Next we dicuss some alternative new physics models which provide an effective ultraviolet cutoff lower than the Planck mass. An effective cutoff \Lambda \simeq 10^{11} GeV leads to a vacuum stability bound on the Higgs mass of 125 GeV. In a gauge-Higgs unification scenario with five-dimensional flat spacetime, the so-called gauge-Higgs condition allows us to predict a Higgs mass of 125 GeV, with the compactification scale of the extra-dimension being identified as the cutoff scale \Lambda \simeq 10^{11} GeV. Identifying the compactification scale with the unification scale of the SM SU(2) gauge coupling and the top quark Yukawa coupling yields a Higgs mass of 121\pm 2 GeV. |
1702.05890 | Qi Chen | Qi Chen and De-fu Hou | The HTL resumed propagators in the light cone gauge | 18pages,6figures | null | 10.1088/1674-1137/42/4/043102 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The expression of the HTL resumed gluon propagator in the light cone gauge is
derived. In the real time mechanism, using the Mandelstam Leibbrant
prescription of $(n\cdot K)^{-1}$, we calculate the transverse and longitudinal
parts of the gluon HTL self-energy and prove the transverse and longitudinal
parts do not have divergence. We also calculate the quark self energy in the
HTL approximation, and find it gauge independent. We analytically calculate the
damping rates of the hard quark and gluon with this HTL resumed gluon
propagator.
| [
{
"created": "Mon, 20 Feb 2017 08:21:18 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Jul 2017 19:15:20 GMT",
"version": "v2"
}
] | 2018-04-18 | [
[
"Chen",
"Qi",
""
],
[
"Hou",
"De-fu",
""
]
] | The expression of the HTL resumed gluon propagator in the light cone gauge is derived. In the real time mechanism, using the Mandelstam Leibbrant prescription of $(n\cdot K)^{-1}$, we calculate the transverse and longitudinal parts of the gluon HTL self-energy and prove the transverse and longitudinal parts do not have divergence. We also calculate the quark self energy in the HTL approximation, and find it gauge independent. We analytically calculate the damping rates of the hard quark and gluon with this HTL resumed gluon propagator. |
hep-ph/0302195 | Alexei Prokudin | R. Fiore, L.L. Jenkovszky, F. Paccanoni, A. Prokudin | The Pomeron In Exclusive Vector Meson Production | 12 pages, 13 figures | Phys.Rev. D68 (2003) 014005 | 10.1103/PhysRevD.68.014005 | DFCAL-TH 03/3 | hep-ph | null | An earlier developed model for vector meson photoproduction, based on a
dipole Pomeron exchange, is extended to electroproduction. Universality of the
non linear Pomeron trajectory is tested by fitting the model to ZEUS and H1
data as well as to CDF data on $\bar pp$ elastic scattering.
| [
{
"created": "Fri, 21 Feb 2003 11:06:43 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Fiore",
"R.",
""
],
[
"Jenkovszky",
"L. L.",
""
],
[
"Paccanoni",
"F.",
""
],
[
"Prokudin",
"A.",
""
]
] | An earlier developed model for vector meson photoproduction, based on a dipole Pomeron exchange, is extended to electroproduction. Universality of the non linear Pomeron trajectory is tested by fitting the model to ZEUS and H1 data as well as to CDF data on $\bar pp$ elastic scattering. |
2401.11423 | Yao-Bei Liu | Jin-Zhong Han, Yao-Bei Liu, Shi-Yu Xu | Pair production of the singlet vector-like B quark at the CLIC | 17 pages, 6 figures. arXiv admin note: text overlap with
arXiv:2112.15044 | Eur. Phys. J. C 84, 61 (2024) | 10.1140/epjc/s10052-023-12362-5 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Vector-like quarks~(VLQs) are a common feature of many scenarios of new
physics beyond the Standard Model~(SM), which generally decay into a SM
third-generation quark with a SM gauge boson, or a Higgs boson. The presence of
a new exotic decay mode of VLQs will reduce the branching ratios of these
standard decay modes and thus relax the current mass exclusion limits from LHC
experiments. Based on a model-independent framework, we investigate the
prospect of discovering the pair production of the weak-singlet VLQ-$B$ at the
future 3-TeV Compact Linear Collider~(CLIC), by focusing on the final states
including one $Z$ boson and four $b$-jets via two types of modes: $Z\to
\ell^{+}\ell^{-}$ and $Z\to \nu\bar{\nu}$. By performing a rapid detector
simulation of the signal and background events, and considering the initial
state radiation and beamstrahlung effects, the exclusion limit at the 95\%
confidence level and the $5\sigma$ discovery prospects are respectively
obtained on the branching ratio of $B\to bZ$ and the VLQ-$B$ masses at the
future 3-TeV CLIC with an integrated luminosity of 5 ab$^{-1}$.
| [
{
"created": "Sun, 21 Jan 2024 08:03:33 GMT",
"version": "v1"
}
] | 2024-01-23 | [
[
"Han",
"Jin-Zhong",
""
],
[
"Liu",
"Yao-Bei",
""
],
[
"Xu",
"Shi-Yu",
""
]
] | Vector-like quarks~(VLQs) are a common feature of many scenarios of new physics beyond the Standard Model~(SM), which generally decay into a SM third-generation quark with a SM gauge boson, or a Higgs boson. The presence of a new exotic decay mode of VLQs will reduce the branching ratios of these standard decay modes and thus relax the current mass exclusion limits from LHC experiments. Based on a model-independent framework, we investigate the prospect of discovering the pair production of the weak-singlet VLQ-$B$ at the future 3-TeV Compact Linear Collider~(CLIC), by focusing on the final states including one $Z$ boson and four $b$-jets via two types of modes: $Z\to \ell^{+}\ell^{-}$ and $Z\to \nu\bar{\nu}$. By performing a rapid detector simulation of the signal and background events, and considering the initial state radiation and beamstrahlung effects, the exclusion limit at the 95\% confidence level and the $5\sigma$ discovery prospects are respectively obtained on the branching ratio of $B\to bZ$ and the VLQ-$B$ masses at the future 3-TeV CLIC with an integrated luminosity of 5 ab$^{-1}$. |
hep-ph/0104289 | Fulvia De Fazio | F. De Fazio and M.R. Pennington | Probing the structure of $f_0(980)$ through radiative $\phi$ decays | Latex, 11 pages, 2 eps figures. Final version to apper in Physics
Letters B | Phys.Lett.B521:15-21,2001 | 10.1016/S0370-2693(01)01200-X | DCPT/01/34 - IPPP/01/17; BARI-TH/413-2001 | hep-ph | null | We consider the radiative transition $\phi \to f_0 \gamma$, which is a
sensitive probe of the nature of the $f_0(980)$ particle. Using the QCD
sum-rule technique, we estimate the branching ratio of such decay mode to be:
${\cal B}(\phi \to f_0 \gamma)=(2.7 \pm 1.1) ~ 10^{-4}$, in fair agreement with
present experimental data. As for the structure of the $f_0$, the result
suggests a sizeable $s {\bar s}$ component; however, this result does not
exclude the possibility of further components and allows a more complex
structure than indicated by the naive quark model.
| [
{
"created": "Fri, 27 Apr 2001 15:10:37 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jun 2001 08:40:44 GMT",
"version": "v2"
}
] | 2010-05-28 | [
[
"De Fazio",
"F.",
""
],
[
"Pennington",
"M. R.",
""
]
] | We consider the radiative transition $\phi \to f_0 \gamma$, which is a sensitive probe of the nature of the $f_0(980)$ particle. Using the QCD sum-rule technique, we estimate the branching ratio of such decay mode to be: ${\cal B}(\phi \to f_0 \gamma)=(2.7 \pm 1.1) ~ 10^{-4}$, in fair agreement with present experimental data. As for the structure of the $f_0$, the result suggests a sizeable $s {\bar s}$ component; however, this result does not exclude the possibility of further components and allows a more complex structure than indicated by the naive quark model. |
1812.10380 | Chowdhury Aminul Islam | Chowdhury Aminul Islam, Aritra Bandyopadhyay, Pradip K. Roy and Sourav
Sarkar | Spectral function and dilepton rate from a strongly magnetised hot and
dense medium in the light of mean field models | 18 pages, 17 figures, title slightly changed, matches with the
published version | Phys. Rev. D 99, 094028 (2019) | 10.1103/PhysRevD.99.094028 | TIFR/TH/18-53 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have calculated the electromagnetic spectral function (SF) vis-\`{a}-vis
the dilepton rate (DR) by evaluating the one-loop photon polarisation tensor
for a strongly magnetised hot and dense medium. The calculation is performed in
the ambit of mean field models namely Nambu\textendash Jona-Lasinio (NJL) and
its Polyakov loop extended version (PNJL) in the lowest Landau level
approximation. These models allow for a dynamical generation of quark mass
which, evidently, gets affected in the presence of a magnetised medium. We have
shown that the strength of the SF gets boosted because of the presence of
dynamical quarks in lieu of the current quarks. It increases as we increase the
magnetic field for a given value of temperature in both NJL and PNJL models.
This increment is further reflected in the DR which is enhanced as compared to
the Born rate for certain values of invariant masses. We also discuss the
impact of chemical potential on DR within the present scenario.
| [
{
"created": "Wed, 26 Dec 2018 17:04:39 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Feb 2019 14:40:09 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Apr 2019 09:52:30 GMT",
"version": "v3"
}
] | 2019-05-29 | [
[
"Islam",
"Chowdhury Aminul",
""
],
[
"Bandyopadhyay",
"Aritra",
""
],
[
"Roy",
"Pradip K.",
""
],
[
"Sarkar",
"Sourav",
""
]
] | We have calculated the electromagnetic spectral function (SF) vis-\`{a}-vis the dilepton rate (DR) by evaluating the one-loop photon polarisation tensor for a strongly magnetised hot and dense medium. The calculation is performed in the ambit of mean field models namely Nambu\textendash Jona-Lasinio (NJL) and its Polyakov loop extended version (PNJL) in the lowest Landau level approximation. These models allow for a dynamical generation of quark mass which, evidently, gets affected in the presence of a magnetised medium. We have shown that the strength of the SF gets boosted because of the presence of dynamical quarks in lieu of the current quarks. It increases as we increase the magnetic field for a given value of temperature in both NJL and PNJL models. This increment is further reflected in the DR which is enhanced as compared to the Born rate for certain values of invariant masses. We also discuss the impact of chemical potential on DR within the present scenario. |
hep-ph/9703220 | null | R. Alemany (CERN), M. Davier (LAL, Orsay), A. Hocker (LAL, Orsay) | Improved Determination of the Hadronic Contribution to the Muon (g-2)
and to alpha(M_Z**2) Using new Data from Hadronic Tau Decays | 23 pages, LaTex, 6 figures, Paper submitted to Zeitschrift fuer
Physik C | Eur.Phys.J.C2:123-135,1998 | 10.1007/s100520050127 | LAL 97-02 | hep-ph | null | We have reevaluated the hadronic contribution to the anomalous magnetic
moment of the muon (g-2) and to the running of the QED fine structure constant
alpha(s) at s=M_Z**2. We incorporated new data from hadronic tau decays,
recently published by the ALEPH Collaboration. In addition, compared to
previous analyses, we use more extensive e+e- annihilation data sets. The
integration over the total hadronic cross section is performed using
experimental data up to 40 GeV and results from perturbative QCD above 40 GeV.
The improvement from tau data concerns mainly the pion form factor, where the
uncertainty in the corresponding integral could be reduced by more than a
factor of two. We obtain for the lowest order hadronic vacuum polarization
graph a_mu(had) = (695.0 +/- 15.0) x 10^{-10} and delta(alpha(M_Z**2))(had) =
(280.9 +/- 6.3) x 10^{-4} using e+e- data only. The corresponding results for
combined e+e- and tau data are a_mu(had) = (701.1 +/- 9.4) x 10^{-10} and
delta(alpha(M_Z**2))(had) = (281.7 +/- 6.2) x 10^{-4}, where the latter is
calculated using the contribution from the five lightest quarks.
| [
{
"created": "Mon, 3 Mar 1997 23:45:45 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Mar 1997 13:51:48 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Alemany",
"R.",
"",
"CERN"
],
[
"Davier",
"M.",
"",
"LAL, Orsay"
],
[
"Hocker",
"A.",
"",
"LAL, Orsay"
]
] | We have reevaluated the hadronic contribution to the anomalous magnetic moment of the muon (g-2) and to the running of the QED fine structure constant alpha(s) at s=M_Z**2. We incorporated new data from hadronic tau decays, recently published by the ALEPH Collaboration. In addition, compared to previous analyses, we use more extensive e+e- annihilation data sets. The integration over the total hadronic cross section is performed using experimental data up to 40 GeV and results from perturbative QCD above 40 GeV. The improvement from tau data concerns mainly the pion form factor, where the uncertainty in the corresponding integral could be reduced by more than a factor of two. We obtain for the lowest order hadronic vacuum polarization graph a_mu(had) = (695.0 +/- 15.0) x 10^{-10} and delta(alpha(M_Z**2))(had) = (280.9 +/- 6.3) x 10^{-4} using e+e- data only. The corresponding results for combined e+e- and tau data are a_mu(had) = (701.1 +/- 9.4) x 10^{-10} and delta(alpha(M_Z**2))(had) = (281.7 +/- 6.2) x 10^{-4}, where the latter is calculated using the contribution from the five lightest quarks. |
0804.3668 | Shinya Matsuzaki | Kazumoto Haba, Shinya Matsuzaki, and Koichi Yamawaki | $S$ Parameter in the Holographic Walking/Conformal Technicolor | typo, a version to be published in Progress of Theoretical Physics | Prog. Theor. Phys. 120 (2008), 691 | 10.1143/PTP.120.691 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explicitly calculate the $S$ parameter in entire parameter space of the
holographic walking/conformal technicolor (W/C TC), based on the deformation of
the holographic QCD by varying the anomalous dimension from $\gamma_m \simeq 0$
through $\gamma_m \simeq 1$ continuously. The $S$ parameter is given as a
positive monotonic function of $\xi$ which is fairly insensitive to $\gamma_m$
and continuously vanishes as $S \sim \xi^2 \to 0$ when $\xi \to 0$, where $\xi$
is the vacuum expectation value of the bulk scalar field at the infrared
boundary of the 5th dimension $z=z_m$ and is related to the mass of (techni-)
$\rho$ meson ($M_\rho$) and the decay constant ($f_\pi$) as $\xi \sim f_\pi z_m
\sim f_\pi/M_\rho$ for $\xi \ll 1$. However, although $\xi$ is related to the
techni-fermion condensate $\condense$, we find no particular suppression of
$\xi$ and hence of $S$ due to large $\gamma_m$, based on the correct
identification of the renormalization-point dependence of $\condense$ in
contrast to the literature. Then we argue possible behaviors of $f_\pi/M_\rho$
as $\condense \to 0$ near the conformal window characterized by the Banks-Zaks
infrared fixed point in more explicit dynamics with $\gamma_m \simeq 1$. It is
a curious coincidence that the result from ladder Schwinger-Dyson and
Bethe-Salpeter equations well fits in the parameter space obtained in this
paper. When $f_\pi/M_\rho \to 0$ is realized, the holography suggests a novel
possibility that $f_\pi$ vanishes much faster than the dynamical mass $m$ does.
| [
{
"created": "Wed, 23 Apr 2008 19:19:09 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Aug 2008 09:08:52 GMT",
"version": "v2"
},
{
"created": "Tue, 2 Sep 2008 09:40:53 GMT",
"version": "v3"
},
{
"created": "Tue, 9 Sep 2008 01:54:36 GMT",
"version": "v4"
}
] | 2008-12-23 | [
[
"Haba",
"Kazumoto",
""
],
[
"Matsuzaki",
"Shinya",
""
],
[
"Yamawaki",
"Koichi",
""
]
] | We explicitly calculate the $S$ parameter in entire parameter space of the holographic walking/conformal technicolor (W/C TC), based on the deformation of the holographic QCD by varying the anomalous dimension from $\gamma_m \simeq 0$ through $\gamma_m \simeq 1$ continuously. The $S$ parameter is given as a positive monotonic function of $\xi$ which is fairly insensitive to $\gamma_m$ and continuously vanishes as $S \sim \xi^2 \to 0$ when $\xi \to 0$, where $\xi$ is the vacuum expectation value of the bulk scalar field at the infrared boundary of the 5th dimension $z=z_m$ and is related to the mass of (techni-) $\rho$ meson ($M_\rho$) and the decay constant ($f_\pi$) as $\xi \sim f_\pi z_m \sim f_\pi/M_\rho$ for $\xi \ll 1$. However, although $\xi$ is related to the techni-fermion condensate $\condense$, we find no particular suppression of $\xi$ and hence of $S$ due to large $\gamma_m$, based on the correct identification of the renormalization-point dependence of $\condense$ in contrast to the literature. Then we argue possible behaviors of $f_\pi/M_\rho$ as $\condense \to 0$ near the conformal window characterized by the Banks-Zaks infrared fixed point in more explicit dynamics with $\gamma_m \simeq 1$. It is a curious coincidence that the result from ladder Schwinger-Dyson and Bethe-Salpeter equations well fits in the parameter space obtained in this paper. When $f_\pi/M_\rho \to 0$ is realized, the holography suggests a novel possibility that $f_\pi$ vanishes much faster than the dynamical mass $m$ does. |
hep-ph/0603230 | Bjorn Garbrecht | K. R. S. Balaji and Bjorn Garbrecht | Perturbative and Nonperturbative Contributions to a Simple Model for
Baryogenesis | 11 pages, 3 figures | Phys.Lett. B638 (2006) 320-324 | 10.1016/j.physletb.2006.05.080 | MCGILL-01-06, MAN/HEP/2006/4 | hep-ph | null | Single field baryogenesis, a scenario for Dirac leptogenesis sourced by a
time-dependent scalar condensate, is studied. We compare the creation of the
charge asymmetry by the perturbative decay of the condensate with the
nonperturbative decay, a process of particle production commonly known in the
context of inflation as preheating. The nonperturbative channel dominates when
the coupling of the scalar field to leptons is sufficiently large.
| [
{
"created": "Tue, 28 Mar 2006 18:52:39 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Jul 2006 17:02:47 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Balaji",
"K. R. S.",
""
],
[
"Garbrecht",
"Bjorn",
""
]
] | Single field baryogenesis, a scenario for Dirac leptogenesis sourced by a time-dependent scalar condensate, is studied. We compare the creation of the charge asymmetry by the perturbative decay of the condensate with the nonperturbative decay, a process of particle production commonly known in the context of inflation as preheating. The nonperturbative channel dominates when the coupling of the scalar field to leptons is sufficiently large. |
1712.08387 | Pedro Fernando Simoes Costa | Pedro Costa, M\'arcio Ferreira, Constan\c{c}a Provid\^encia | Magnetized QCD phase diagram: critical end points for the strange quark
phase transition driven by external magnetic fields | Contribution to the proceedings of Hadron 2017 - XVII International
Conference on Hadron Spectroscopy and Structure, September 25th-29th 2017,
Salamanca, Spain | null | 10.22323/1.310.0161 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we examine possible effects of an external magnetic field in the
strongly interacting matter phase diagram. The study is performed using the
Polyakov-Nambu-Jona-Lasinio model. Possible consequences of the inverse
magnetic catalysis effect on the phase diagram at both finite chemical
potential and temperature are analyzed. We devote special emphasis on how the
location of the multiple critical end points (CEPs) change in a magnetized
medium: the presence of an external magnetic field induces several CEPs in the
strange sector, which arise due to the multiple phase transitions that the
strange quark undergoes. We also study the deconfinement transition which turns
out to be less sensitive to the external magnetic field when compared to the
quark phase transitions. The crossover nature of the deconfinement is preserved
over the whole phase diagram.
| [
{
"created": "Fri, 22 Dec 2017 10:37:29 GMT",
"version": "v1"
}
] | 2022-09-21 | [
[
"Costa",
"Pedro",
""
],
[
"Ferreira",
"Márcio",
""
],
[
"Providência",
"Constança",
""
]
] | In this work we examine possible effects of an external magnetic field in the strongly interacting matter phase diagram. The study is performed using the Polyakov-Nambu-Jona-Lasinio model. Possible consequences of the inverse magnetic catalysis effect on the phase diagram at both finite chemical potential and temperature are analyzed. We devote special emphasis on how the location of the multiple critical end points (CEPs) change in a magnetized medium: the presence of an external magnetic field induces several CEPs in the strange sector, which arise due to the multiple phase transitions that the strange quark undergoes. We also study the deconfinement transition which turns out to be less sensitive to the external magnetic field when compared to the quark phase transitions. The crossover nature of the deconfinement is preserved over the whole phase diagram. |
2108.03482 | Chandan Mondal | Mohammad Ahmady, Satvir Kaur, Sugee Lee MacKay, Chandan Mondal, Ruben
Sandapen | Hadron spectroscopy using the light-front holographic Schr\"odinger
equation and the 't Hooft equation | 28 pages, 10 figures, 8 tables; added hadron spectroscopy with an
alternative longitudinal potential, expanded discussion, version to appear in
PRD | Phys. Rev. D 104, 074013 (2021) | 10.1103/PhysRevD.104.074013 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Light-front holographic QCD provides a successful first approximation to
hadron spectroscopy in the chiral limit of $(3+1)$-dim light-front QCD, where a
holographic Schr\"odinger-like equation, with an emerging confining scale,
$\kappa$, governs confinement in the transverse direction. In its
supersymmetric formulation, light-front holography predicts that each baryon
has two superpartners: a meson and a tetraquark, with their degenerate masses
being generated by the same scale, $\kappa$. In nature, this mass degeneracy is
lifted by chiral symmetry breaking and longitudinal confinement. In this paper,
we show that the latter can be successfully captured by the 't Hooft equation
of $(1+1)$-dim, large $N_c$, QCD. Together, the holographic Schr\"odinger
equation and the 't Hooft equation, provide a good global description of the
data across the full hadron spectrum with a universal $\kappa$.
| [
{
"created": "Sat, 7 Aug 2021 16:25:41 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Oct 2021 15:07:27 GMT",
"version": "v2"
}
] | 2021-10-20 | [
[
"Ahmady",
"Mohammad",
""
],
[
"Kaur",
"Satvir",
""
],
[
"MacKay",
"Sugee Lee",
""
],
[
"Mondal",
"Chandan",
""
],
[
"Sandapen",
"Ruben",
""
]
] | Light-front holographic QCD provides a successful first approximation to hadron spectroscopy in the chiral limit of $(3+1)$-dim light-front QCD, where a holographic Schr\"odinger-like equation, with an emerging confining scale, $\kappa$, governs confinement in the transverse direction. In its supersymmetric formulation, light-front holography predicts that each baryon has two superpartners: a meson and a tetraquark, with their degenerate masses being generated by the same scale, $\kappa$. In nature, this mass degeneracy is lifted by chiral symmetry breaking and longitudinal confinement. In this paper, we show that the latter can be successfully captured by the 't Hooft equation of $(1+1)$-dim, large $N_c$, QCD. Together, the holographic Schr\"odinger equation and the 't Hooft equation, provide a good global description of the data across the full hadron spectrum with a universal $\kappa$. |
1111.2604 | Alex Drlica-Wagner | R.C. Cotta, A. Drlica-Wagner, S. Murgia, E.D. Bloom, J.L. Hewett, and
T.G. Rizzo | Constraints on the pMSSM from LAT Observations of Dwarf Spheroidal
Galaxies | 24 pages, 9 figures, submitted to JCAP | JCAP 1204 (2012) 016 | 10.1088/1475-7516/2012/04/016 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the ability for the Large Area Telescope (LAT) to constrain
Minimal Supersymmetric Standard Model (MSSM) dark matter through a combined
analysis of Milky Way dwarf spheroidal galaxies. We examine the Lightest
Supersymmetric Particles (LSPs) for a set of ~71k experimentally valid
supersymmetric models derived from the phenomenological-MSSM (pMSSM). We find
that none of these models can be excluded at 95% confidence by the current
analysis; nevertheless, many lie within the predicted reach of future LAT
analyses. With two years of data, we find that the LAT is currently most
sensitive to light LSPs (m_LSP < 50 GeV) annihilating into tau-pairs and
heavier LSPs annihilating into b-bbar. Additionally, we find that future LAT
analyses will be able to probe some LSPs that form a sub-dominant component of
dark matter. We directly compare the LAT results to direct detection
experiments and show the complementarity of these search methods.
| [
{
"created": "Thu, 10 Nov 2011 21:00:02 GMT",
"version": "v1"
}
] | 2013-01-04 | [
[
"Cotta",
"R. C.",
""
],
[
"Drlica-Wagner",
"A.",
""
],
[
"Murgia",
"S.",
""
],
[
"Bloom",
"E. D.",
""
],
[
"Hewett",
"J. L.",
""
],
[
"Rizzo",
"T. G.",
""
]
] | We examine the ability for the Large Area Telescope (LAT) to constrain Minimal Supersymmetric Standard Model (MSSM) dark matter through a combined analysis of Milky Way dwarf spheroidal galaxies. We examine the Lightest Supersymmetric Particles (LSPs) for a set of ~71k experimentally valid supersymmetric models derived from the phenomenological-MSSM (pMSSM). We find that none of these models can be excluded at 95% confidence by the current analysis; nevertheless, many lie within the predicted reach of future LAT analyses. With two years of data, we find that the LAT is currently most sensitive to light LSPs (m_LSP < 50 GeV) annihilating into tau-pairs and heavier LSPs annihilating into b-bbar. Additionally, we find that future LAT analyses will be able to probe some LSPs that form a sub-dominant component of dark matter. We directly compare the LAT results to direct detection experiments and show the complementarity of these search methods. |
2401.08305 | Hang Li | Hang Li and P. Wang | Nonlocal QED and lepton g-2 anomalies | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum electrodynamics is generally extended to a nonlocal QED by
introducing the correlation functions. The gauge link is introduced to
guarantee that the nonlocal QED is locally U(1) gauge invariant. The
corresponding Feynman rules as well as the proof of Ward-Takahashi identity are
presented. As an example, the anomalous magnetic moments of leptons are studied
in nonlocal QED. At one-loop level, besides the ordinary diagrams, there are
many additional Feynman diagrams which are generated from the gauge link. It
shows the nonlocal QED can provide a reasonable explanation for lepton g-2
anomalies.
| [
{
"created": "Tue, 16 Jan 2024 12:04:20 GMT",
"version": "v1"
}
] | 2024-01-17 | [
[
"Li",
"Hang",
""
],
[
"Wang",
"P.",
""
]
] | Quantum electrodynamics is generally extended to a nonlocal QED by introducing the correlation functions. The gauge link is introduced to guarantee that the nonlocal QED is locally U(1) gauge invariant. The corresponding Feynman rules as well as the proof of Ward-Takahashi identity are presented. As an example, the anomalous magnetic moments of leptons are studied in nonlocal QED. At one-loop level, besides the ordinary diagrams, there are many additional Feynman diagrams which are generated from the gauge link. It shows the nonlocal QED can provide a reasonable explanation for lepton g-2 anomalies. |
1301.3033 | Rafal Maciula | Rafal Maciula, Antoni Szczurek | Open charm production at the LHC - $k_{t}$-factorization approach | 27 pages, 33 figures | null | 10.1103/PhysRevD.87.094022 | null | hep-ph hep-ex nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss inclusive production of open charm in proton-proton scattering at
LHC. The calculation is performed within the $k_t$-factorization approach.
Different models of unintegrated gluon distributions (UGDF) from the literature
are used. The theoretical transverse momentum as well as (pseudo)rapidity
distributions of charmed mesons are compared with recent experimental data of
ATLAS, ALICE and LHCb collaborations. Only the calculation with
Kimber-Martin-Ryskin (KMR) UGDF gives results comparable to experimental ones.
All other popular models of UGDF significantly underpredict experimental data.
Several sources of uncertainties of the theoretical predictions are also
studied in details. In addition we discuss correlations between $D$ and $\bar
D$ mesons. Good description of experimental distribution in invariant mass and
in relative azimuthal angle between $D$ and $\bar D$ mesons is achieved for the
KMR UGDF. The considered correlation observables measured by the LHCb
experiment were not discussed in other approaches in the literature.
| [
{
"created": "Mon, 14 Jan 2013 16:20:24 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Maciula",
"Rafal",
""
],
[
"Szczurek",
"Antoni",
""
]
] | We discuss inclusive production of open charm in proton-proton scattering at LHC. The calculation is performed within the $k_t$-factorization approach. Different models of unintegrated gluon distributions (UGDF) from the literature are used. The theoretical transverse momentum as well as (pseudo)rapidity distributions of charmed mesons are compared with recent experimental data of ATLAS, ALICE and LHCb collaborations. Only the calculation with Kimber-Martin-Ryskin (KMR) UGDF gives results comparable to experimental ones. All other popular models of UGDF significantly underpredict experimental data. Several sources of uncertainties of the theoretical predictions are also studied in details. In addition we discuss correlations between $D$ and $\bar D$ mesons. Good description of experimental distribution in invariant mass and in relative azimuthal angle between $D$ and $\bar D$ mesons is achieved for the KMR UGDF. The considered correlation observables measured by the LHCb experiment were not discussed in other approaches in the literature. |
hep-ph/9511267 | James M. Johnson | Suraj N. Gupta and James M. Johnson | Bc spectroscopy in a quantum-chromodynamic potential model | 10 page ReVTeX paper | Phys.Rev.D53:312-314,1996 | 10.1103/PhysRevD.53.312 | null | hep-ph | null | We have investigated $B_c$ spectroscopy with the use of a
quantum-chromodynamic potential model which was recently used by us for the
light-heavy quarkonia. We give our predictions for the energy levels and the
$E$1 transition widths. We also find, rather surprisingly, that although $B_c$
is not a light-heavy system, the heavy quark effective theory with the
inclusion of the $m_b^{-1}$ and $m_b^{-1}\ln m_b$ corrections is as successful
for $B_c$ as it is for $B$ and $B_s$.
| [
{
"created": "Wed, 8 Nov 1995 19:00:16 GMT",
"version": "v1"
}
] | 2011-01-27 | [
[
"Gupta",
"Suraj N.",
""
],
[
"Johnson",
"James M.",
""
]
] | We have investigated $B_c$ spectroscopy with the use of a quantum-chromodynamic potential model which was recently used by us for the light-heavy quarkonia. We give our predictions for the energy levels and the $E$1 transition widths. We also find, rather surprisingly, that although $B_c$ is not a light-heavy system, the heavy quark effective theory with the inclusion of the $m_b^{-1}$ and $m_b^{-1}\ln m_b$ corrections is as successful for $B_c$ as it is for $B$ and $B_s$. |
1412.5815 | Shoaib Munir | Nils-Erik Bomark, Stefano Moretti, Shoaib Munir and Leszek Roszkowski | Revisiting a light NMSSM pseudoscalar at the LHC | 6 pages, 3 figures; Proceedings of "Prospects for Charged Higgs
Discovery at Colliders (CHARGED 2014)", September 2014, Uppsala, Sweden.
Typos and references corrected | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The discovery of a light, singlet-like pseudoscalar Higgs boson, $A_1$, of
the Next-to-Minimal Supersymmetric Standard Model (NMSSM) could provide a
hallmark signature of non-minimal supersymmetry. We review here the potential
of the LHC to probe such a light $A_1$ in the decays of one of the heavier
scalar Higgs bosons of the NMSSM. We find the production of pairs of the $A_1$,
with a mass below 60 GeV or so, via decays of the two lightest scalar states to
be especially promising, for an integrated luminosity as low as 30/fb. For
heavier masses, the decay of the heaviest scalar into a $Z$ boson and an $A_1$
could lead to its detection at the LHC.
| [
{
"created": "Thu, 18 Dec 2014 11:31:33 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Feb 2015 08:01:35 GMT",
"version": "v2"
}
] | 2015-02-19 | [
[
"Bomark",
"Nils-Erik",
""
],
[
"Moretti",
"Stefano",
""
],
[
"Munir",
"Shoaib",
""
],
[
"Roszkowski",
"Leszek",
""
]
] | The discovery of a light, singlet-like pseudoscalar Higgs boson, $A_1$, of the Next-to-Minimal Supersymmetric Standard Model (NMSSM) could provide a hallmark signature of non-minimal supersymmetry. We review here the potential of the LHC to probe such a light $A_1$ in the decays of one of the heavier scalar Higgs bosons of the NMSSM. We find the production of pairs of the $A_1$, with a mass below 60 GeV or so, via decays of the two lightest scalar states to be especially promising, for an integrated luminosity as low as 30/fb. For heavier masses, the decay of the heaviest scalar into a $Z$ boson and an $A_1$ could lead to its detection at the LHC. |
2304.09004 | Jun Zeng | Zhi-Fu Deng, Chao Han, Wei Wang, Jun Zeng, Jia-Lu Zhang | Light-cone distribution amplitudes of a light baryon in large-momentum
effective theory | 19 pages, 2 figures | null | 10.1007/JHEP07(2023)191 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Momentum distributions of quarks/gluons inside a light baryon in a hard
exclusive process are encoded in the light-cone distribution amplitudes
(LCDAs). In this work, we point out that the leading twist LCDAs of a light
baryon can be obtained through a simulation of a quasi-distribution amplitude
calculable on lattice QCD within the framework of the large-momentum effective
theory. We calculate the one-loop perturbative contributions to LCDA and
quasi-distribution amplitudes and explicitly demonstrate the factorization of
quasi-distribution amplitudes at the one-loop level. Based on the perturbative
results, we derive the matching kernel in the $\overline{\rm MS}$ scheme and
regularization-invariant momentum-subtraction scheme. Our result provides a
first step to obtaining the LCDA from first principle lattice QCD calculations
in the future.
| [
{
"created": "Tue, 18 Apr 2023 14:14:39 GMT",
"version": "v1"
}
] | 2023-08-09 | [
[
"Deng",
"Zhi-Fu",
""
],
[
"Han",
"Chao",
""
],
[
"Wang",
"Wei",
""
],
[
"Zeng",
"Jun",
""
],
[
"Zhang",
"Jia-Lu",
""
]
] | Momentum distributions of quarks/gluons inside a light baryon in a hard exclusive process are encoded in the light-cone distribution amplitudes (LCDAs). In this work, we point out that the leading twist LCDAs of a light baryon can be obtained through a simulation of a quasi-distribution amplitude calculable on lattice QCD within the framework of the large-momentum effective theory. We calculate the one-loop perturbative contributions to LCDA and quasi-distribution amplitudes and explicitly demonstrate the factorization of quasi-distribution amplitudes at the one-loop level. Based on the perturbative results, we derive the matching kernel in the $\overline{\rm MS}$ scheme and regularization-invariant momentum-subtraction scheme. Our result provides a first step to obtaining the LCDA from first principle lattice QCD calculations in the future. |
hep-ph/9607469 | Saul Youssef | David Jaffe and Saul Youssef | Bayesian estimate of the effect of B^0B^0bar mixing measurements on the
CKM matrix elements | Nine pages | Comput.Phys.Commun.101:206,1997 | 10.1016/S0010-4655(96)00171-3 | FSU-SCRI-96-61 | hep-ph hep-ex | null | A method employing Bayesian statistics is used to incorporate recent
experimental results on BdBdbar and BsBsbar mixing into a measurement of the
Cabibbo-Kobayashi-Maskawa matrix elements. The neutral B meson mixing results
yield a slight improvement in the estimation of Vtd.
| [
{
"created": "Tue, 30 Jul 1996 14:14:24 GMT",
"version": "v1"
}
] | 2010-11-23 | [
[
"Jaffe",
"David",
""
],
[
"Youssef",
"Saul",
""
]
] | A method employing Bayesian statistics is used to incorporate recent experimental results on BdBdbar and BsBsbar mixing into a measurement of the Cabibbo-Kobayashi-Maskawa matrix elements. The neutral B meson mixing results yield a slight improvement in the estimation of Vtd. |
1211.2429 | Ilya F. Ginzburg | Ilya F. Ginzburg | Singularities in the single lepton energy spectrum for precise measuring
mass and spin of Dark Matter particles at the e^+e^- Linear Collider | 6 pages, 3 figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider models in which stability of Dark Matter particles $D$ is ensured
by the conservation of the new quantum number, called D-parity here. Our models
contain also charged $D$-odd particle $D^\pm$.
Here I propose the method for precision measuring masses and spin of
$D$-particles via the study of energy distribution of single lepton ($e$ or
$\mu$) in the process $\epe\to D^+D^-\to DDW^+W^-$ with the observable states
{\it dijet + lepton} ($\mu$ or $e$) + {\it nothing}. To determine precisely
masses of $D$ and $D^\pm$, it is sufficient to measure the singular points in
the lepton energy distributions (upper edge and kinks or peak). After this,
even a rough measuring of corresponding cross section allows to determine the
spin of $D$ particles.
This approach is free from the difficulties of a well-known methods of
measuring the masses via the edges of the energy distribution of dijets,
representing $W$, which obliged by inaccuracies in measuring the energies of
individual jets.
| [
{
"created": "Sun, 11 Nov 2012 15:03:10 GMT",
"version": "v1"
}
] | 2012-11-13 | [
[
"Ginzburg",
"Ilya F.",
""
]
] | We consider models in which stability of Dark Matter particles $D$ is ensured by the conservation of the new quantum number, called D-parity here. Our models contain also charged $D$-odd particle $D^\pm$. Here I propose the method for precision measuring masses and spin of $D$-particles via the study of energy distribution of single lepton ($e$ or $\mu$) in the process $\epe\to D^+D^-\to DDW^+W^-$ with the observable states {\it dijet + lepton} ($\mu$ or $e$) + {\it nothing}. To determine precisely masses of $D$ and $D^\pm$, it is sufficient to measure the singular points in the lepton energy distributions (upper edge and kinks or peak). After this, even a rough measuring of corresponding cross section allows to determine the spin of $D$ particles. This approach is free from the difficulties of a well-known methods of measuring the masses via the edges of the energy distribution of dijets, representing $W$, which obliged by inaccuracies in measuring the energies of individual jets. |
hep-ph/0209166 | Alexander Khodjamirian | Alexander Khodjamirian | QCD Sum Rules - a Working Tool for Hadronic Physics | Latex, ws-procs9x6 style, 22 pages, 7 figures; talk given at
Continuous Advances in QCD 2002/ ARKADYFEST (honoring the 60th birthday of
Arkady Vainshtein),Minneapolis, Minnesota, 17-23 May 2002, to be published in
the Proceedings | null | 10.1142/9789812776310_0004 | TTP02-23 | hep-ph | null | QCD sum rules are overviewed with an emphasize on the practical applications
of this method to the physics of light and heavy hadrons.
| [
{
"created": "Sun, 15 Sep 2002 13:57:48 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Khodjamirian",
"Alexander",
""
]
] | QCD sum rules are overviewed with an emphasize on the practical applications of this method to the physics of light and heavy hadrons. |
0811.0306 | Oleg Veretin | B. A. Kniehl, A. V. Kotikov, O. L. Veretin | Irrational constants in positronium decays | Presented at 9th Workshop on Elementary Particle Theory: Loops and
Legs in Quantum Field Theory, Sondershausen, 20-25 Apr 2008. 6 pages, 3
figures | null | 10.1016/j.nuclphysbps.2008.09.075 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We establish irrational constants, that contribute to the positronium
lifetime at $O(\alpha)$ and $O(\alpha^2)$ order. In particular we show, that a
new type of constants appear, which are not related to Euler--Zagier sums or
multiple $\zeta$ values.
| [
{
"created": "Mon, 3 Nov 2008 14:15:29 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Kniehl",
"B. A.",
""
],
[
"Kotikov",
"A. V.",
""
],
[
"Veretin",
"O. L.",
""
]
] | We establish irrational constants, that contribute to the positronium lifetime at $O(\alpha)$ and $O(\alpha^2)$ order. In particular we show, that a new type of constants appear, which are not related to Euler--Zagier sums or multiple $\zeta$ values. |
1310.2256 | Ayres Freitas | A. Freitas | Two-loop fermionic electroweak corrections to the Z-boson width and
production rate | 7 pages; v2: few typos fixed and minor corrections of numbers in
tables | Phys. Lett. B 730 (2014) 50-52 | 10.1016/j.physletb.2014.01.017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Improved predictions for the Z-boson decay width and the hadronic Z-peak
cross-section within the Standard Model are presented, based on a complete
calculation of electroweak two-loop corrections with closed fermion loops.
Compared to previous partial results, the predictions for the Z width and
hadronic cross-section shift by about 0.6 MeV and 0.004 nb, respectively.
Compact parametrization formulae are provided, which approximate the full
results to better than 4 ppm.
| [
{
"created": "Tue, 8 Oct 2013 20:02:52 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Jan 2014 19:13:35 GMT",
"version": "v2"
}
] | 2014-01-24 | [
[
"Freitas",
"A.",
""
]
] | Improved predictions for the Z-boson decay width and the hadronic Z-peak cross-section within the Standard Model are presented, based on a complete calculation of electroweak two-loop corrections with closed fermion loops. Compared to previous partial results, the predictions for the Z width and hadronic cross-section shift by about 0.6 MeV and 0.004 nb, respectively. Compact parametrization formulae are provided, which approximate the full results to better than 4 ppm. |
2404.19197 | Yuan-Zhen Li | Yuan-Zhen Li, Michael J. Ramsey-Musolf, Jiang-Hao Yu | Does the Electron EDM Preclude Electroweak Baryogenesis ? | 6 pages, 3 figures | null | null | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Electroweak baryogenesis (EWBG) constitutes a theoretically compelling and
experimentally testable mechanism for explaining the origin of the baryon
asymmetry of the universe (BAU). New results for the electric dipole moment
(EDM) of the electron place significant constraints on the beyond Standard
Model CP-violation needed for successful EWBG. We show how new developments in
EWBG quantum transport theory that include CP-violating sources first order in
gradients imply more relaxed EDM constraints than implied by previous
approximation formulations. Consequently, EWBG remains viable even in light of
present EDM bounds. We also illustrate how these developments enable a more
realistic treatment of CP-conserving interactions that can also have a decisive
impact on the predicted BAU.
| [
{
"created": "Tue, 30 Apr 2024 01:49:02 GMT",
"version": "v1"
}
] | 2024-05-02 | [
[
"Li",
"Yuan-Zhen",
""
],
[
"Ramsey-Musolf",
"Michael J.",
""
],
[
"Yu",
"Jiang-Hao",
""
]
] | Electroweak baryogenesis (EWBG) constitutes a theoretically compelling and experimentally testable mechanism for explaining the origin of the baryon asymmetry of the universe (BAU). New results for the electric dipole moment (EDM) of the electron place significant constraints on the beyond Standard Model CP-violation needed for successful EWBG. We show how new developments in EWBG quantum transport theory that include CP-violating sources first order in gradients imply more relaxed EDM constraints than implied by previous approximation formulations. Consequently, EWBG remains viable even in light of present EDM bounds. We also illustrate how these developments enable a more realistic treatment of CP-conserving interactions that can also have a decisive impact on the predicted BAU. |
2405.04145 | Zhi-Gang Wang | Zhi-Gang Wang | The ground states and first radial excitations of the vector tetraquark
states with explicit P-waves via the QCD sum rules | 12 pages, 4 figures | Chin. Phys. C48 (2024) 103103 | 10.1088/1674-1137/ad5ae5 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this work, we choose the diquark-antidiquark type four-quark currents with
an explicit P-wave between the diquark and antidiquark pairs to study the
ground states and first radial excitations of the hidden-charm tetraquark
states with the quantum numbers $J^{PC}=1^{--}$. And we obtain the lowest
vector tetraquark masses and make possible assignments of the existing $Y$
states. There indeed exists a hidden-charm tetraquark state with the
$J^{PC}=1^{--}$ at the energy about $4.75\,\rm{GeV}$ as the first radial
excitation to account for the BESIII data.
| [
{
"created": "Tue, 7 May 2024 09:22:21 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jun 2024 13:45:32 GMT",
"version": "v2"
}
] | 2024-08-13 | [
[
"Wang",
"Zhi-Gang",
""
]
] | In this work, we choose the diquark-antidiquark type four-quark currents with an explicit P-wave between the diquark and antidiquark pairs to study the ground states and first radial excitations of the hidden-charm tetraquark states with the quantum numbers $J^{PC}=1^{--}$. And we obtain the lowest vector tetraquark masses and make possible assignments of the existing $Y$ states. There indeed exists a hidden-charm tetraquark state with the $J^{PC}=1^{--}$ at the energy about $4.75\,\rm{GeV}$ as the first radial excitation to account for the BESIII data. |
1202.1297 | Thomas A. Ryttov | Thomas A. Ryttov and Robert Shrock | Comparison of Some Exact and Perturbative Results for a Supersymmetric
SU($N_c$) Gauge Theory | 16 pages, 3 figures | Phys. Rev. D85, 076009 (2012) | 10.1103/PhysRevD.85.076009 | YITP-SB-11-23 | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider vectorial, asymptotically free ${\cal N}=1$ supersymmetric
SU($N_c$) gauge theories with $N_f$ copies of massless chiral super fields in
various representations and study how perturbative predictions for the lower
boundary of the infrared conformal phase, as a function of $N_f$, compare with
exact results. We make use of two-loop and three-loop calculations of the beta
function and anomalous dimension of the quadratic chiral super field operator
product for this purpose. The specific chiral superfield contents that we
consider are $N_f$ copies of (i) $F+\bar F$, (ii) $Adj$, (iii) $S_2+\bar S_2$,
and (iv) $A_2 + \bar A_2$, where $F$, $Adj$, $S_2$, and $A_2$ denote,
respectively, the fundamental, adjoint, and symmetric and antisymmetric rank-2
tensor representations. We find that perturbative results slightly overestimate
the value of $N_{f,cr}$ relative to the respective exact results for these
representations, i.e., slightly underestimate the interval in $N_f$ for which
the theory has infrared conformal behavior. Our results provide a measure of
how closely perturbative calculations reproduce exact results for these
theories.
| [
{
"created": "Mon, 6 Feb 2012 21:19:19 GMT",
"version": "v1"
}
] | 2012-04-26 | [
[
"Ryttov",
"Thomas A.",
""
],
[
"Shrock",
"Robert",
""
]
] | We consider vectorial, asymptotically free ${\cal N}=1$ supersymmetric SU($N_c$) gauge theories with $N_f$ copies of massless chiral super fields in various representations and study how perturbative predictions for the lower boundary of the infrared conformal phase, as a function of $N_f$, compare with exact results. We make use of two-loop and three-loop calculations of the beta function and anomalous dimension of the quadratic chiral super field operator product for this purpose. The specific chiral superfield contents that we consider are $N_f$ copies of (i) $F+\bar F$, (ii) $Adj$, (iii) $S_2+\bar S_2$, and (iv) $A_2 + \bar A_2$, where $F$, $Adj$, $S_2$, and $A_2$ denote, respectively, the fundamental, adjoint, and symmetric and antisymmetric rank-2 tensor representations. We find that perturbative results slightly overestimate the value of $N_{f,cr}$ relative to the respective exact results for these representations, i.e., slightly underestimate the interval in $N_f$ for which the theory has infrared conformal behavior. Our results provide a measure of how closely perturbative calculations reproduce exact results for these theories. |
hep-ph/9911348 | Christoph Greub | C. Greub (Bern) | Theory of rare B meson decays | 14 pages including 8 postscript figures | null | null | BUTP-99/22 | hep-ph | null | I review the NLO QCD calculations of the branching ratio for B--> X_s gamma
in the SM. Including the leading electromagnetic corrections, one obtaines
BR(B-> X_s gamma)=(3.32 +- 0.30)*10^{-4}. Confronting theory with the newest
data, an updated value for |V_{ts}| is obtained: |V_{ts}|=0.037 +- 0.007.
Theoretical progress on the photon energy spectrum is also discussed. The
inclusive FCNC semileptonic decays in the SM are briefly summarized.
Furthermore, B--> X_s gamma is considered in 2HDMs and in different SUSY
scenarios. QCD corrections are shown to be crucial.
| [
{
"created": "Sat, 13 Nov 1999 20:53:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Greub",
"C.",
"",
"Bern"
]
] | I review the NLO QCD calculations of the branching ratio for B--> X_s gamma in the SM. Including the leading electromagnetic corrections, one obtaines BR(B-> X_s gamma)=(3.32 +- 0.30)*10^{-4}. Confronting theory with the newest data, an updated value for |V_{ts}| is obtained: |V_{ts}|=0.037 +- 0.007. Theoretical progress on the photon energy spectrum is also discussed. The inclusive FCNC semileptonic decays in the SM are briefly summarized. Furthermore, B--> X_s gamma is considered in 2HDMs and in different SUSY scenarios. QCD corrections are shown to be crucial. |
1101.6044 | Edi Halyo | Edi Halyo | Supersymmetry Breaking by the Right-Handed Tau Neutrino | 20 pages | null | null | SU-ITP-11/01 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe supersymmetry breaking by the F-term of a heavy right-handed tau
neutrino with a VEV. Due to the the tau neutrino Yukawa coupling, the
neutralino, chargino and scalar mass matrices and the weak currents are
modified. In addition, there are new cubic and quartic scalar and trilinear R
parity violating interactions. For large $\tan \beta$ these effects may be
quite large. The scenario requires low energy supersymmetry breaking with
generic values of $F \sim 10^{10}$~GeV.
| [
{
"created": "Mon, 31 Jan 2011 18:15:40 GMT",
"version": "v1"
}
] | 2011-02-01 | [
[
"Halyo",
"Edi",
""
]
] | We describe supersymmetry breaking by the F-term of a heavy right-handed tau neutrino with a VEV. Due to the the tau neutrino Yukawa coupling, the neutralino, chargino and scalar mass matrices and the weak currents are modified. In addition, there are new cubic and quartic scalar and trilinear R parity violating interactions. For large $\tan \beta$ these effects may be quite large. The scenario requires low energy supersymmetry breaking with generic values of $F \sim 10^{10}$~GeV. |
1408.2964 | Jan Uphoff | Jan Uphoff, Oliver Fochler, Zhe Xu, Carsten Greiner | Elastic and radiative heavy quark interactions in ultra-relativistic
heavy-ion collisions | 18 pages, 18 figures | null | 10.1088/0954-3899/42/11/115106 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Elastic and radiative heavy quark interactions with light partons are studied
with the partonic transport description BAMPS (Boltzmann Approach to
MultiParton Scatterings). After calculating the cross section of radiative
processes for finite masses in the improved Gunion-Bertsch approximation and
verifying this calculation by comparing to the exact result, we study elastic
and radiative heavy quark energy loss in a static medium of quarks and gluons.
Furthermore, the full 3+1D space-time evolution of gluons, light quarks, and
heavy quarks in ultra-relativistic heavy-ion collisions at the BNL Relativistic
Heavy-Ion Collider (RHIC) and the CERN Large Hadron Collider (LHC) are
calculated with BAMPS including elastic and radiative heavy flavor
interactions. Treating light and heavy particles on the same footing in the
same framework, we find that the experimentally measured nuclear modification
factor of charged hadrons and D mesons at the LHC can be simultaneously
described. In addition, we calculate the heavy flavor evolution with an
improved screening procedure from hard-thermal-loop calculations and confront
the results with experimental data of the nuclear modification factor and the
elliptic flow of heavy flavor particles at RHIC and LHC.
| [
{
"created": "Wed, 13 Aug 2014 10:19:53 GMT",
"version": "v1"
}
] | 2015-10-28 | [
[
"Uphoff",
"Jan",
""
],
[
"Fochler",
"Oliver",
""
],
[
"Xu",
"Zhe",
""
],
[
"Greiner",
"Carsten",
""
]
] | Elastic and radiative heavy quark interactions with light partons are studied with the partonic transport description BAMPS (Boltzmann Approach to MultiParton Scatterings). After calculating the cross section of radiative processes for finite masses in the improved Gunion-Bertsch approximation and verifying this calculation by comparing to the exact result, we study elastic and radiative heavy quark energy loss in a static medium of quarks and gluons. Furthermore, the full 3+1D space-time evolution of gluons, light quarks, and heavy quarks in ultra-relativistic heavy-ion collisions at the BNL Relativistic Heavy-Ion Collider (RHIC) and the CERN Large Hadron Collider (LHC) are calculated with BAMPS including elastic and radiative heavy flavor interactions. Treating light and heavy particles on the same footing in the same framework, we find that the experimentally measured nuclear modification factor of charged hadrons and D mesons at the LHC can be simultaneously described. In addition, we calculate the heavy flavor evolution with an improved screening procedure from hard-thermal-loop calculations and confront the results with experimental data of the nuclear modification factor and the elliptic flow of heavy flavor particles at RHIC and LHC. |
1001.4082 | Gavin Salam | Andrea Banfi, Gavin P. Salam and Giulia Zanderighi | Phenomenology of event shapes at hadron colliders | 70 pages, 25 figures, additional material available from
http://www.lpthe.jussieu.fr/~salam/pp-event-shapes/ | JHEP 1006:038,2010 | 10.1007/JHEP06(2010)038 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present results for matched distributions of a range of dijet event shapes
at hadron colliders, combining next-to-leading logarithmic (NLL) accuracy in
the resummation exponent, next-to-next-to leading logarithmic (NNLL) accuracy
in its expansion and next-to-leading order (NLO) accuracy in a pure alpha_s
expansion. This is the first time that such a matching has been carried out for
hadronic final-state observables at hadron colliders. We compare our results to
Monte Carlo predictions, with and without matching to multi-parton tree-level
fixed-order calculations. These studies suggest that hadron-collider event
shapes have significant scope for constraining both perturbative and
non-perturbative aspects of hadron-collider QCD. The differences between
various calculational methods also highlight the limits of relying on
simultaneous variations of renormalisation and factorisation scale in making
reliable estimates of uncertainties in QCD predictions. We also discuss the
sensitivity of event shapes to the topology of multi-jet events, which are
expected to appear in many New Physics scenarios.
| [
{
"created": "Fri, 22 Jan 2010 21:02:52 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Banfi",
"Andrea",
""
],
[
"Salam",
"Gavin P.",
""
],
[
"Zanderighi",
"Giulia",
""
]
] | We present results for matched distributions of a range of dijet event shapes at hadron colliders, combining next-to-leading logarithmic (NLL) accuracy in the resummation exponent, next-to-next-to leading logarithmic (NNLL) accuracy in its expansion and next-to-leading order (NLO) accuracy in a pure alpha_s expansion. This is the first time that such a matching has been carried out for hadronic final-state observables at hadron colliders. We compare our results to Monte Carlo predictions, with and without matching to multi-parton tree-level fixed-order calculations. These studies suggest that hadron-collider event shapes have significant scope for constraining both perturbative and non-perturbative aspects of hadron-collider QCD. The differences between various calculational methods also highlight the limits of relying on simultaneous variations of renormalisation and factorisation scale in making reliable estimates of uncertainties in QCD predictions. We also discuss the sensitivity of event shapes to the topology of multi-jet events, which are expected to appear in many New Physics scenarios. |
1401.7327 | Pavel Fileviez Perez | Pavel Fileviez Perez, Sogee Spinner | The Higgs Mass and the Stueckelberg Mechanism in Supersymmetry | to appear in Physical Review D | Phys. Rev. D 89, 095004 (2014) | 10.1103/PhysRevD.89.095004 | null | hep-ph hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a class of theories where the mass of the lightest Higgs boson
of the Minimal Supersymmetric Standard Model (MSSM) can be larger than the Z
gauge boson mass at tree level. In this context the MSSM fields feel a new
force, whose corresponding gauge boson attains its mass through the
Stueckelberg mechanism. We show how one can achieve a Higgs mass around 126 GeV
without assuming a heavy stop spectrum or a large stop trilinear term. The
application of this class of models to the conservation of R-parity is also
discussed.
| [
{
"created": "Tue, 28 Jan 2014 21:00:27 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Apr 2014 21:09:34 GMT",
"version": "v2"
}
] | 2014-05-14 | [
[
"Perez",
"Pavel Fileviez",
""
],
[
"Spinner",
"Sogee",
""
]
] | We investigate a class of theories where the mass of the lightest Higgs boson of the Minimal Supersymmetric Standard Model (MSSM) can be larger than the Z gauge boson mass at tree level. In this context the MSSM fields feel a new force, whose corresponding gauge boson attains its mass through the Stueckelberg mechanism. We show how one can achieve a Higgs mass around 126 GeV without assuming a heavy stop spectrum or a large stop trilinear term. The application of this class of models to the conservation of R-parity is also discussed. |
1707.07155 | Seyed Yaser Ayazi | Seyed Yaser Ayazi and Saeid Paktinat Mehdiabadi | The s-Channel Single Top Quark Production as a Constraint for $W'$ Boson
Contribution | 10 pages, 6 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An analysis is performed to constrain the $W'$ boson production using the
measurement of the s-channel single top quark production cross section. Both
phenomenological and statistical approaches are examined and results are
presented. In the best case, $W'$ bosons that interact only to the right-handed
fermions are excluded below 1390 GeV. To our knowledge, it is the first time
that the measured cross section of the s-channel single top quark production
from the colliders is used to rule out part of the phase space of the $W'$
boson.
| [
{
"created": "Sat, 22 Jul 2017 12:52:14 GMT",
"version": "v1"
}
] | 2017-07-25 | [
[
"Ayazi",
"Seyed Yaser",
""
],
[
"Mehdiabadi",
"Saeid Paktinat",
""
]
] | An analysis is performed to constrain the $W'$ boson production using the measurement of the s-channel single top quark production cross section. Both phenomenological and statistical approaches are examined and results are presented. In the best case, $W'$ bosons that interact only to the right-handed fermions are excluded below 1390 GeV. To our knowledge, it is the first time that the measured cross section of the s-channel single top quark production from the colliders is used to rule out part of the phase space of the $W'$ boson. |
hep-ph/9611369 | Sin Kyu Kang | Kyungsik Kang, Sin Kyu Kang, Jihn E. Kim, and Pyungwon Ko | Almost maximally broken permutation symmetry for neutrino mass matrix | 9 pages, RevTex, no figures | Mod.Phys.Lett. A12 (1997) 1175-1184 | 10.1142/S0217732397001205 | Brown-HET-1062 and SNUTP 96-011 | hep-ph | null | Assuming three light neutrinos are Majorana particles, we propose mass matrix
ansatz for the charged leptons and Majorana neutrinos with family symmetry
$S_{3} $ broken into $S_{1}$ and $S_{2}$, respectively. Each matrix has three
parameters, which are fixed by measured charged lepton masses, differences of
squared neutrino masses relevant to the solar and the atmospheric neutrino
puzzles, and the masses of three light Majorana neutrinos as a candidate for
hot dark matter with $\sum |m_{\nu}| \sim 6 eV$. The resulting neutrino mixing
is compatible with the data for the current upper limit, $ < m_{\nu_e} >_{th} <
0.8 eV$, of neutrino-less double beta decay experiments, and the current data
for various types of neutrino oscillation experiments. One solution of our
model predicts that $\nu_{\mu} \rightarrow \nu_{\tau}$ oscillation probability
is about $< 0.008$ with $\Delta m^{2} \sim 10^{-2} eV^2$, which may not be
accessible at CHORUS and other ongoing experiments.
| [
{
"created": "Tue, 19 Nov 1996 20:43:23 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Kang",
"Kyungsik",
""
],
[
"Kang",
"Sin Kyu",
""
],
[
"Kim",
"Jihn E.",
""
],
[
"Ko",
"Pyungwon",
""
]
] | Assuming three light neutrinos are Majorana particles, we propose mass matrix ansatz for the charged leptons and Majorana neutrinos with family symmetry $S_{3} $ broken into $S_{1}$ and $S_{2}$, respectively. Each matrix has three parameters, which are fixed by measured charged lepton masses, differences of squared neutrino masses relevant to the solar and the atmospheric neutrino puzzles, and the masses of three light Majorana neutrinos as a candidate for hot dark matter with $\sum |m_{\nu}| \sim 6 eV$. The resulting neutrino mixing is compatible with the data for the current upper limit, $ < m_{\nu_e} >_{th} < 0.8 eV$, of neutrino-less double beta decay experiments, and the current data for various types of neutrino oscillation experiments. One solution of our model predicts that $\nu_{\mu} \rightarrow \nu_{\tau}$ oscillation probability is about $< 0.008$ with $\Delta m^{2} \sim 10^{-2} eV^2$, which may not be accessible at CHORUS and other ongoing experiments. |
2009.04782 | Martin Rohrmoser | Martin Rohrmoser, Krzysztof Kutak, Andreas van Hameren, Wies{\l}aw
P{\l}aczek, Konrad Tywoniuk | In-medium transverse momentum broadening effects on di-jet observables | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Heavy ion collisions at high energies can be used as an interesting way to
recreate and study the medium of the quark-gluon plasma (QGP). We particularly
investigate the jets produced in hard binary collisions and their interactions
with a tentative medium. These jets were obtained numerically from the
Monte-Carlo simulations of hard collisions using the KATIE-algorithm [1], where
parton momenta within the colliding nucleons were describe by means of
unintegrated parton distribution functions (uPDF). We evolved these jets within
a medium that contains both, transverse kicks (yielding a broadening in
momentum transvers to the jet-axis) as well as medium induced radiation within
the MINCAS-algorithm [2] following the works of [3,4]. We produce qualitative
results for the decorrelation of dijets. In particular, we study deviations
from a transverse momentum broadening that follows a Gaussian distribution.
[1] A. van Hameren, Comput.Phys.Commun. 224 (2018) 371-380 [2] K. Kutak, W.
P{\l}aczek, R. Straka, Eur.Phys.J. C79 (2019) no.4, 317 [3] J.-P. Blaizot, F.
Dominguez, E. Iancu, Y. Mehtar-Tani, JHEP 1301 (2013) 143 [4] J.-P. Blaizot, F.
Dominguez, E. Iancu, Y. Mehtar-Tani, JHEP 1406 (2014) 075
| [
{
"created": "Thu, 10 Sep 2020 11:35:21 GMT",
"version": "v1"
}
] | 2020-09-11 | [
[
"Rohrmoser",
"Martin",
""
],
[
"Kutak",
"Krzysztof",
""
],
[
"van Hameren",
"Andreas",
""
],
[
"Płaczek",
"Wiesław",
""
],
[
"Tywoniuk",
"Konrad",
""
]
] | Heavy ion collisions at high energies can be used as an interesting way to recreate and study the medium of the quark-gluon plasma (QGP). We particularly investigate the jets produced in hard binary collisions and their interactions with a tentative medium. These jets were obtained numerically from the Monte-Carlo simulations of hard collisions using the KATIE-algorithm [1], where parton momenta within the colliding nucleons were describe by means of unintegrated parton distribution functions (uPDF). We evolved these jets within a medium that contains both, transverse kicks (yielding a broadening in momentum transvers to the jet-axis) as well as medium induced radiation within the MINCAS-algorithm [2] following the works of [3,4]. We produce qualitative results for the decorrelation of dijets. In particular, we study deviations from a transverse momentum broadening that follows a Gaussian distribution. [1] A. van Hameren, Comput.Phys.Commun. 224 (2018) 371-380 [2] K. Kutak, W. P{\l}aczek, R. Straka, Eur.Phys.J. C79 (2019) no.4, 317 [3] J.-P. Blaizot, F. Dominguez, E. Iancu, Y. Mehtar-Tani, JHEP 1301 (2013) 143 [4] J.-P. Blaizot, F. Dominguez, E. Iancu, Y. Mehtar-Tani, JHEP 1406 (2014) 075 |
hep-ph/0302162 | Pierpaolo Mastrolia | P. Mastrolia (1,2) and E. Remiddi (1,3) ((1) University of Bologna,
(2) University of Karlsruhe, (3) INFN-Bologna) | Two-Loop Form Factors in QED | 13 pages, 1 figure | Nucl.Phys.B664:341-356,2003 | 10.1016/S0550-3213(03)00405-X | TTP-03-05 | hep-ph | null | We evaluate the on shell form factors of the electron for arbitrary momentum
transfer and finite electron mass, at two loops in QED, by integrating the
corresponding dispersion relations, which involve the imaginary parts known
since a long time. The infrared divergences are parameterized in terms of a
fictitious small photon mass. The result is expressed in terms of Harmonic
Polylogarithms of maximum weight 4. The expansions for small and large momentum
transfer are also given
| [
{
"created": "Tue, 18 Feb 2003 19:05:12 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Mastrolia",
"P.",
""
],
[
"Remiddi",
"E.",
""
]
] | We evaluate the on shell form factors of the electron for arbitrary momentum transfer and finite electron mass, at two loops in QED, by integrating the corresponding dispersion relations, which involve the imaginary parts known since a long time. The infrared divergences are parameterized in terms of a fictitious small photon mass. The result is expressed in terms of Harmonic Polylogarithms of maximum weight 4. The expansions for small and large momentum transfer are also given |
2201.06580 | Ruth Sch\"afer | Torben Ferber, Anastasiia Filimonova, Ruth Sch\"afer, Susanne Westhoff | Displaced or invisible? ALPs from $B$ decays at Belle II | 30 pages, 12 figures, 1 table | null | 10.1007/JHEP04(2023)131 | P3H-22-005, Nikhef 2022-001 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | At colliders, neutral long-lived particles can be detected through displaced
decay products or as missing energy. Which search strategy is better depends on
the particle's decay length just as on the detector properties. We investigate
the complementarity of displaced and invisible signatures for the Belle II
experiment. Focusing on axion-like particles $a$ produced from meson decays, we
present a new search strategy for two-body decays $B^+ \to K^+ a, a\to
E\!\!\!/$ with missing energy $E\!\!\!/$. With $50\,$ab$^{-1}$ of data, Belle
II can probe light invisible resonances with branching ratio
$\mathcal{B}(B^+\to K^+ a) \gtrsim 10^{-7}$ and decay length $c\tau_a \gtrsim
1\,$m. For axion-like particles, we expect the sensitivity of $B^+ \to K^+
E\!\!\!/$ to small couplings to improve by up to two orders of magnitude
compared to previous searches at collider and fixed-target experiments. For
sub-GeV particles, $B^+ \to K^+ E\!\!\!/$ at Belle II and searches at beam-dump
experiments are most sensitive; for heavier particles, searches for displaced
vertices at Belle II, long-lived particle experiments at the LHC, and future
fixed-target experiments can probe the smallest couplings.
| [
{
"created": "Mon, 17 Jan 2022 19:00:01 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Jun 2023 13:52:42 GMT",
"version": "v2"
}
] | 2023-06-16 | [
[
"Ferber",
"Torben",
""
],
[
"Filimonova",
"Anastasiia",
""
],
[
"Schäfer",
"Ruth",
""
],
[
"Westhoff",
"Susanne",
""
]
] | At colliders, neutral long-lived particles can be detected through displaced decay products or as missing energy. Which search strategy is better depends on the particle's decay length just as on the detector properties. We investigate the complementarity of displaced and invisible signatures for the Belle II experiment. Focusing on axion-like particles $a$ produced from meson decays, we present a new search strategy for two-body decays $B^+ \to K^+ a, a\to E\!\!\!/$ with missing energy $E\!\!\!/$. With $50\,$ab$^{-1}$ of data, Belle II can probe light invisible resonances with branching ratio $\mathcal{B}(B^+\to K^+ a) \gtrsim 10^{-7}$ and decay length $c\tau_a \gtrsim 1\,$m. For axion-like particles, we expect the sensitivity of $B^+ \to K^+ E\!\!\!/$ to small couplings to improve by up to two orders of magnitude compared to previous searches at collider and fixed-target experiments. For sub-GeV particles, $B^+ \to K^+ E\!\!\!/$ at Belle II and searches at beam-dump experiments are most sensitive; for heavier particles, searches for displaced vertices at Belle II, long-lived particle experiments at the LHC, and future fixed-target experiments can probe the smallest couplings. |
hep-ph/0301123 | Matthias Neubert | S.W. Bosch (Cornell), R.J. Hill (SLAC), B.O. Lange (Cornell), M.
Neubert (Cornell) | Factorization and Sudakov Resummation in Leptonic Radiative B Decay | 20 pages, 5 figures; several references added or updated, extended
discussion of the new elements of the factorization proof, typo in eq.(6)
fixed; version to appear in Phys. Rev. D | Phys.Rev.D67:094014,2003 | 10.1103/PhysRevD.67.094014 | CLNS-03/1817, SLAC-PUB-9625 | hep-ph | null | Soft-collinear effective theory is used to prove factorization of the
B->gamma+l+nu decay amplitude at leading power in Lambda/m_b, including a
demonstration of the absence of non-valence Fock states and of the finiteness
of the convolution integral in the factorization formula. Large logarithms
entering the hard-scattering kernel are resummed by performing a two-step
perturbative matching onto the low-energy effective theory, and by solving
evolution equations derived from the renormalization properties of the
leading-order B-meson light-cone distribution amplitude. As a byproduct, the
evolution equation for heavy-collinear current operators in soft-collinear
effective theory is derived.
| [
{
"created": "Thu, 16 Jan 2003 21:47:35 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Apr 2003 15:46:05 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bosch",
"S. W.",
"",
"Cornell"
],
[
"Hill",
"R. J.",
"",
"SLAC"
],
[
"Lange",
"B. O.",
"",
"Cornell"
],
[
"Neubert",
"M.",
"",
"Cornell"
]
] | Soft-collinear effective theory is used to prove factorization of the B->gamma+l+nu decay amplitude at leading power in Lambda/m_b, including a demonstration of the absence of non-valence Fock states and of the finiteness of the convolution integral in the factorization formula. Large logarithms entering the hard-scattering kernel are resummed by performing a two-step perturbative matching onto the low-energy effective theory, and by solving evolution equations derived from the renormalization properties of the leading-order B-meson light-cone distribution amplitude. As a byproduct, the evolution equation for heavy-collinear current operators in soft-collinear effective theory is derived. |
1711.07464 | Dipyaman Pramanik | Sandhya Choubey, Debajyoti Dutta, Dipyaman Pramanik | Measuring the Sterile Neutrino CP Phase at DUNE and T2HK | Published in EPJ C with minor corrections | Eur.Phys.J. C78 (2018) no.4, 339 | 10.1140/epjc/s10052-018-5816-y | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The CP phases associated with the sterile neutrino cannot be measured in the
dedicated short-baseline experiments being built to test the sterile neutrino
hypothesis. On the other hand, these phases can be measured in long-baseline
experiments, even though the main goal of these experiments is not to test or
measure sterile neutrino parameters. In particular, the sterile neutrino phase
$\delta_{24}$ affects the charged-current electron appearance data in
long-baseline experiment. In this paper we show for the first time how well the
sterile neutrino phase $\delta_{24}$ can be measured by the next-generation
long-baseline experiments DUNE, T2HK (and T2HKK). We also show the expected
precision with which this sterile phase can be measured by combining the DUNE
data with data from T2HK or T2HKK. We also present the sensitivity of these
experiments to the sterile mixing angles, both by themselves, as well as when
DUNE is combined with T2HK or T2HKK.
| [
{
"created": "Mon, 20 Nov 2017 18:56:12 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Nov 2017 14:56:56 GMT",
"version": "v2"
},
{
"created": "Sun, 6 May 2018 10:31:33 GMT",
"version": "v3"
}
] | 2018-05-08 | [
[
"Choubey",
"Sandhya",
""
],
[
"Dutta",
"Debajyoti",
""
],
[
"Pramanik",
"Dipyaman",
""
]
] | The CP phases associated with the sterile neutrino cannot be measured in the dedicated short-baseline experiments being built to test the sterile neutrino hypothesis. On the other hand, these phases can be measured in long-baseline experiments, even though the main goal of these experiments is not to test or measure sterile neutrino parameters. In particular, the sterile neutrino phase $\delta_{24}$ affects the charged-current electron appearance data in long-baseline experiment. In this paper we show for the first time how well the sterile neutrino phase $\delta_{24}$ can be measured by the next-generation long-baseline experiments DUNE, T2HK (and T2HKK). We also show the expected precision with which this sterile phase can be measured by combining the DUNE data with data from T2HK or T2HKK. We also present the sensitivity of these experiments to the sterile mixing angles, both by themselves, as well as when DUNE is combined with T2HK or T2HKK. |
hep-ph/0309116 | Matthias Burkardt | Matthias Burkardt (New Mexico State University) | Some Inequalities for the Generalized Parton Distribution E(x,0,t) | 3 pages | Phys.Lett. B582 (2004) 151-156 | 10.1016/j.physletb.2003.12.058 | null | hep-ph | null | We discuss some constraints on the $x$ and $t$-dependence of $E(x,0,t)$ that
arise from positivity bounds in the impact parameter representation. In
addition, we show that $E(x,0,0)$ for the nucleon vanishes for $x\to 1$ at
least as rapidly as $(1-x)^4$. Finally we provide an inequality that limits the
contribution from $E$ to the angular momentum sum rule.
| [
{
"created": "Wed, 10 Sep 2003 21:56:53 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Burkardt",
"Matthias",
"",
"New Mexico State University"
]
] | We discuss some constraints on the $x$ and $t$-dependence of $E(x,0,t)$ that arise from positivity bounds in the impact parameter representation. In addition, we show that $E(x,0,0)$ for the nucleon vanishes for $x\to 1$ at least as rapidly as $(1-x)^4$. Finally we provide an inequality that limits the contribution from $E$ to the angular momentum sum rule. |
0807.4815 | Yu-Feng Zhou | Yu-Feng Zhou | Mixing-induced CP violating sources for electroweak baryogenesis | 3 pages, 2 figures. Talk given at the 16th International Conference
on Supersymmetry and the Unification of Fundamental Interactions (SUSY08)
June 16 - 21, 2008, Seoul, Korea. To appear in the proceedings | AIP Conf.Proc.1078:506-508,2009 | 10.1063/1.3052010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effects of flavor mixing in electroweak baryogenesis is investigated in a
generalized semiclassical WKB approach. Through calculating the nonadiabatic
corrections to the particle currents it is shown that extra CP violation
sources arise from the off-diagonal part of the equation of motion of particles
moving inside the bubble wall. The numerical importance of the mixing-induced
source is discussed in the Minimal Supersymmetric Standard Model and compared
with the source term induced by semiclassical force.
| [
{
"created": "Wed, 30 Jul 2008 09:20:04 GMT",
"version": "v1"
}
] | 2009-02-02 | [
[
"Zhou",
"Yu-Feng",
""
]
] | The effects of flavor mixing in electroweak baryogenesis is investigated in a generalized semiclassical WKB approach. Through calculating the nonadiabatic corrections to the particle currents it is shown that extra CP violation sources arise from the off-diagonal part of the equation of motion of particles moving inside the bubble wall. The numerical importance of the mixing-induced source is discussed in the Minimal Supersymmetric Standard Model and compared with the source term induced by semiclassical force. |
2209.09290 | Gongjun Choi | Gongjun Choi, Tsutomu T. Yanagida | High Quality Axion in Supersymmetric Models | 27 pages,1 figure, 2 tables. v3: version accepted by JHEP | null | 10.1007/JHEP12(2022)067 | CERN-TH-2022-149 | hep-ph hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | In this work, we discuss how the use of the symmetries well motivated in
physics beyond the Standard model (BSM) can guarantee the high quality axions.
We avoid to introduce symmetries only useful for addressing the axion quality
problem. Rather, we rely on symmetries well motivated by other issues in BSM:
supersymmetry, $U(1)_{\rm B-L}$ and the discrete R-symmetry $Z_{NR}$. We show
that the interplay among these guarantees the high quality of the axion even
for the gravitino mass and axion decay constant as large as
$m_{3/2}=\mathcal{O}(10){\rm TeV}$ and $F_{a}=\mathcal{O}(10^{15}){\rm GeV}$
respectively. The key point of this work relies on the observation that the
MSSM contribution to the mixed anomalies $Z_{NR}-[SU(2)_{L}]^{2}$ and
$Z_{NR}-[SU(3)_{c}]^{2}$ is not enough for gauging $Z_{NR}$ for $N\neq6$, which
necessitates the introduction of new matter fields. We make the introduction to
achieve zero mixed anomalies, which logically supports a desired large enough
$N$ for $Z_{NR}$. This mechanism effectively makes $Z_{NR}$ equal to $U(1)_{R}$
and thus offers a logically complete solution to the axion quality problem.
| [
{
"created": "Mon, 19 Sep 2022 18:29:11 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Oct 2022 16:02:01 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Dec 2022 13:32:14 GMT",
"version": "v3"
}
] | 2023-01-04 | [
[
"Choi",
"Gongjun",
""
],
[
"Yanagida",
"Tsutomu T.",
""
]
] | In this work, we discuss how the use of the symmetries well motivated in physics beyond the Standard model (BSM) can guarantee the high quality axions. We avoid to introduce symmetries only useful for addressing the axion quality problem. Rather, we rely on symmetries well motivated by other issues in BSM: supersymmetry, $U(1)_{\rm B-L}$ and the discrete R-symmetry $Z_{NR}$. We show that the interplay among these guarantees the high quality of the axion even for the gravitino mass and axion decay constant as large as $m_{3/2}=\mathcal{O}(10){\rm TeV}$ and $F_{a}=\mathcal{O}(10^{15}){\rm GeV}$ respectively. The key point of this work relies on the observation that the MSSM contribution to the mixed anomalies $Z_{NR}-[SU(2)_{L}]^{2}$ and $Z_{NR}-[SU(3)_{c}]^{2}$ is not enough for gauging $Z_{NR}$ for $N\neq6$, which necessitates the introduction of new matter fields. We make the introduction to achieve zero mixed anomalies, which logically supports a desired large enough $N$ for $Z_{NR}$. This mechanism effectively makes $Z_{NR}$ equal to $U(1)_{R}$ and thus offers a logically complete solution to the axion quality problem. |
2010.15993 | Eduardo Rojas | Bruno El-Bennich, G. E. R. Zambrano, Eduardo Rojas | The Podolsky propagator in gap and bound-state equations | 12 pages, 6 figures | Phys. Rev. D 103, 076008 (2021) | 10.1103/PhysRevD.103.076008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the Generalized Quantum Electrodynamics expression for the Podolsky
propagator, which preserves gauge invariance for massive photons, we propose a
model for the massive gluon propagator that reproduces well-known features of
established strong-interaction models in the framework of the Dyson-Schwinger
equation. By adjusting the Podolsky mass and the coupling strength we thus
construct a model with simple analytical properties known from perturbative
theory, yet well suited to describe a confining interaction. We obtain
solutions of the Dyson-Schwinger equation for the quark at space-like momenta
on the real axis as well as on the complex plane and solving the bound-state
problem with the Bethe-Salpeter equation yields masses and weak decay constants
of the $\pi, K$ and $\eta_c$ in excellent agreement with experimental values,
while the $D$ and $D_s$ are reasonably well described. The analytical
simplicity of this effective interaction has the potential to be useful for
phenomenological applications and may facilitate calculations in Minkowski
space.
| [
{
"created": "Thu, 29 Oct 2020 23:44:43 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Mar 2021 20:32:13 GMT",
"version": "v2"
}
] | 2021-04-21 | [
[
"El-Bennich",
"Bruno",
""
],
[
"Zambrano",
"G. E. R.",
""
],
[
"Rojas",
"Eduardo",
""
]
] | Based on the Generalized Quantum Electrodynamics expression for the Podolsky propagator, which preserves gauge invariance for massive photons, we propose a model for the massive gluon propagator that reproduces well-known features of established strong-interaction models in the framework of the Dyson-Schwinger equation. By adjusting the Podolsky mass and the coupling strength we thus construct a model with simple analytical properties known from perturbative theory, yet well suited to describe a confining interaction. We obtain solutions of the Dyson-Schwinger equation for the quark at space-like momenta on the real axis as well as on the complex plane and solving the bound-state problem with the Bethe-Salpeter equation yields masses and weak decay constants of the $\pi, K$ and $\eta_c$ in excellent agreement with experimental values, while the $D$ and $D_s$ are reasonably well described. The analytical simplicity of this effective interaction has the potential to be useful for phenomenological applications and may facilitate calculations in Minkowski space. |
hep-ph/0509307 | Zhang Xiao-Bing | Xiao-Bing Zhang and Xue-Qian Li | Density dependence of quark masses and stability of color-flavor locked
phases | 4 figures, to be appeared in PRD | Phys.Rev.D72:054021,2005 | 10.1103/PhysRevD.72.054021 | null | hep-ph | null | Considering the density dependence of quark masses, we investigate the
color-flavor-locked matter and its stability relative to the ( unpaired )
strange quark matter. We find that, when the current mass of strange quark
$m_s$ is small, the strange quark matter remains stable for the moderate baryon
densities. When $m_s$ is large, the gapless phase of the color-flavor-locked
matter is found to be difficult to be stable. A schematic phase diagram of
three-flavor quark matter is presented, in which the color-flavor-locked phase
region is suppressed in comparison with the previous results.
| [
{
"created": "Tue, 27 Sep 2005 15:31:12 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Zhang",
"Xiao-Bing",
""
],
[
"Li",
"Xue-Qian",
""
]
] | Considering the density dependence of quark masses, we investigate the color-flavor-locked matter and its stability relative to the ( unpaired ) strange quark matter. We find that, when the current mass of strange quark $m_s$ is small, the strange quark matter remains stable for the moderate baryon densities. When $m_s$ is large, the gapless phase of the color-flavor-locked matter is found to be difficult to be stable. A schematic phase diagram of three-flavor quark matter is presented, in which the color-flavor-locked phase region is suppressed in comparison with the previous results. |
2006.14681 | Nan Li | Yu-Chen Ding, Nan Li, Chun-Cheng Wei and Yu-Feng Zhou | The high energy window of probing dark matter with cosmic-ray
antideuterium and antihelium | 22 pages, 12 figures; to appear on Chin. Phys. C | null | 10.1088/1674-1137/abf13a | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmic-ray (CR) anti-nuclei are often considered as important observables for
dark matter (DM) indirect detections at low kinetic energies below GeV per
nucleon. Since the primary CR fluxes drop quickly towards high energies, the
secondary anti-nuclei in CR are expected to be significantly suppressed in high
energy regions ($\gtrsim 100$ GeV per nucleon). If DM particles are heavy, the
annihilation productions of DM can be highly boosted, thus the fluxes of
anti-nuclei produced by DM annihilations may exceed the secondary background at
high energies, which opens a high energy window for DM indirect detections. We
investigate the possibility of detecting heavy DM particles which annihilate
into high energy anti-nuclei. We use Monte-Carlo generators $\texttt{PYTHIA}$,
$\texttt{EPOS-LHC}$ and $\texttt{DPMJET}$ and the coalescence model to simulate
the production of anti-nuclei, and constrain the DM annihilation cross sections
by using the AMS-02 and HAWC antiproton data and the HESS galactic center
gamma-ray data. We find that the conclusion depends on the choice of DM density
profiles. For the "Cored" type profile with a DM particle mass $\gtrsim 10$
TeV, the contributions from DM annihilations can exceed the secondary
background in high energy regions, which opens the high energy window. While
for the "Cuspy" type profile, the excess disappears.
| [
{
"created": "Thu, 25 Jun 2020 20:19:17 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Mar 2021 12:47:07 GMT",
"version": "v2"
}
] | 2021-07-07 | [
[
"Ding",
"Yu-Chen",
""
],
[
"Li",
"Nan",
""
],
[
"Wei",
"Chun-Cheng",
""
],
[
"Zhou",
"Yu-Feng",
""
]
] | Cosmic-ray (CR) anti-nuclei are often considered as important observables for dark matter (DM) indirect detections at low kinetic energies below GeV per nucleon. Since the primary CR fluxes drop quickly towards high energies, the secondary anti-nuclei in CR are expected to be significantly suppressed in high energy regions ($\gtrsim 100$ GeV per nucleon). If DM particles are heavy, the annihilation productions of DM can be highly boosted, thus the fluxes of anti-nuclei produced by DM annihilations may exceed the secondary background at high energies, which opens a high energy window for DM indirect detections. We investigate the possibility of detecting heavy DM particles which annihilate into high energy anti-nuclei. We use Monte-Carlo generators $\texttt{PYTHIA}$, $\texttt{EPOS-LHC}$ and $\texttt{DPMJET}$ and the coalescence model to simulate the production of anti-nuclei, and constrain the DM annihilation cross sections by using the AMS-02 and HAWC antiproton data and the HESS galactic center gamma-ray data. We find that the conclusion depends on the choice of DM density profiles. For the "Cored" type profile with a DM particle mass $\gtrsim 10$ TeV, the contributions from DM annihilations can exceed the secondary background in high energy regions, which opens the high energy window. While for the "Cuspy" type profile, the excess disappears. |
2209.09517 | Bo Feng | Bo Feng | Generation Function For One-loop Tensor Reduction | 38 Pages | null | 10.1088/1572-9494/aca253 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | For loop integrals, the reduction is the standard method. Having an efficient
way to find reduction coefficients is an important topic in scattering
amplitudes. In this paper, we present the generation functions of reduction
coefficients for general one-loop integrals with
arbitrary tensor rank.
| [
{
"created": "Tue, 20 Sep 2022 07:24:36 GMT",
"version": "v1"
}
] | 2023-02-22 | [
[
"Feng",
"Bo",
""
]
] | For loop integrals, the reduction is the standard method. Having an efficient way to find reduction coefficients is an important topic in scattering amplitudes. In this paper, we present the generation functions of reduction coefficients for general one-loop integrals with arbitrary tensor rank. |
0805.2677 | Mauro Anselmino | M. Anselmino, M. Boglione, U. D'Alesio, A. Kotzinian, S. Melis, F.
Murgia, A. Prokudin and C. Turk | Sivers Effect for Pion and Kaon Production in Semi-Inclusive Deep
Inelastic Scattering | 16 pages, 19 figures; v2: no changes in results and conclusions; some
sentences rephrased, few paragraphs (and references) added; a new table
(table 2) with individual chi^2 per data points added; figures for JLab at 6
GeV removed; matches the version published on Eur. Phys. J. A | Eur.Phys.J.A39:89-100,2009 | 10.1140/epja/i2008-10697-y | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Sivers effect in the transverse single spin asymmetries (SSA)
for pion and kaon production in semi-inclusive deep inelastic scattering
(SIDIS) processes. We perform a fit of A^sin(phi_h-phi_S)_UT which, by
including recent high statistics experimental data for pion and kaon production
from HERMES and COMPASS Collaborations, allows a new determination of the
Sivers distribution functions for quarks and antiquarks with u, d and s
flavours. Estimates for forthcoming SIDIS experiments at COMPASS and JLab are
given.
| [
{
"created": "Sat, 17 May 2008 15:13:54 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Jan 2009 12:00:41 GMT",
"version": "v2"
}
] | 2009-02-19 | [
[
"Anselmino",
"M.",
""
],
[
"Boglione",
"M.",
""
],
[
"D'Alesio",
"U.",
""
],
[
"Kotzinian",
"A.",
""
],
[
"Melis",
"S.",
""
],
[
"Murgia",
"F.",
""
],
[
"Prokudin",
"A.",
""
],
[
"Turk",
"C.",
""
]
] | We study the Sivers effect in the transverse single spin asymmetries (SSA) for pion and kaon production in semi-inclusive deep inelastic scattering (SIDIS) processes. We perform a fit of A^sin(phi_h-phi_S)_UT which, by including recent high statistics experimental data for pion and kaon production from HERMES and COMPASS Collaborations, allows a new determination of the Sivers distribution functions for quarks and antiquarks with u, d and s flavours. Estimates for forthcoming SIDIS experiments at COMPASS and JLab are given. |
2108.01486 | Mohammad Sharifian | Mohammad Sharifian, Moslem Zarei, Mehdi Abdi, Marco Peloso, and Sabino
Matarrese | Probing Virtual ALPs by Precision Phase Measurements: Time-Varying
Magnetic Field Background | 26 pages, 8 figures | https://iopscience.iop.org/article/10.1088/1475-7516/2023/04/036 | 10.1088/1475-7516/2023/04/036 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose an experimental scheme for detecting the effects of off-shell
axion-like particles (ALPs) through optical cavities. In this proposed
experiment, linearly polarized photons are pumped into an optical cavity where
an external time-dependent magnetic field is present. The magnetic field
mediates an interaction between the cavity photons and ALPs giving rise to a
modification in the phase of the cavity photons. The time-dependent nature of
the external magnetic field prompts a novel amplification effect which
significantly enhances this phase modification. A detection scheme is then
proposed to identify such axion-induced phase shifts. We find that the phase
modification is considerably sensitive to the photon-ALPs coupling constants
$g_{a\gamma\gamma}$ for the range of ALPs mass $3.1\:\mu\textrm{eV}\leqslant
m_a \leqslant 44.4\:\mu\textrm{eV}$.
| [
{
"created": "Tue, 3 Aug 2021 13:24:07 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Apr 2023 12:27:14 GMT",
"version": "v2"
}
] | 2023-04-14 | [
[
"Sharifian",
"Mohammad",
""
],
[
"Zarei",
"Moslem",
""
],
[
"Abdi",
"Mehdi",
""
],
[
"Peloso",
"Marco",
""
],
[
"Matarrese",
"Sabino",
""
]
] | We propose an experimental scheme for detecting the effects of off-shell axion-like particles (ALPs) through optical cavities. In this proposed experiment, linearly polarized photons are pumped into an optical cavity where an external time-dependent magnetic field is present. The magnetic field mediates an interaction between the cavity photons and ALPs giving rise to a modification in the phase of the cavity photons. The time-dependent nature of the external magnetic field prompts a novel amplification effect which significantly enhances this phase modification. A detection scheme is then proposed to identify such axion-induced phase shifts. We find that the phase modification is considerably sensitive to the photon-ALPs coupling constants $g_{a\gamma\gamma}$ for the range of ALPs mass $3.1\:\mu\textrm{eV}\leqslant m_a \leqslant 44.4\:\mu\textrm{eV}$. |
1011.2185 | Thomas G. Rizzo | Thomas G. Rizzo | Transverse Beam Polarization as an Alternate View into New Physics at
CLIC | 16 pages, 8 figures. Based on a talk given at the International
Workshop on Linear Colliders, CERN, Geneva, Switzerland, 18-22 Oct 2010;
typos corrected | null | null | SLAC-PUB-14280 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In $e^+e^-$ collisions, transverse beam polarization can be a useful tool in
studying the properties of particles associated with new physics beyond the
Standard Model(SM). However, unlike in the case of measurements associated with
longitudinal polarization, the formation of azimuthal asymmetries used to probe
this physics in the case of transverse polarization requires both $e^\pm$ beams
to be simultaneously polarized. In this paper we discuss the further use of
transverse polarization as a probe of new physics models at a high energy,
$\sqrt s=3$ TeV version of CLIC. In particular, we show ($i$) how measurements
of the sign of these asymmetries is sufficient to discriminate the production
of spin-0 supersymmetric states from the spin-1/2 Kaluza-Klein excitations of
Universal Extra Dimensions. Simultaneously, the contribution to this asymmetry
arising from the potentially large SM $W^+W^-$ background can be made
negligibly small. We then show ($ii$) how measurements of such asymmetries and
their associated angular distributions on the peak of a new resonant $Z'$-like
state can be used to extract precision information on the $Z'$ couplings to the
SM fermions.
| [
{
"created": "Tue, 9 Nov 2010 20:17:04 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Jan 2011 15:24:43 GMT",
"version": "v2"
}
] | 2011-01-04 | [
[
"Rizzo",
"Thomas G.",
""
]
] | In $e^+e^-$ collisions, transverse beam polarization can be a useful tool in studying the properties of particles associated with new physics beyond the Standard Model(SM). However, unlike in the case of measurements associated with longitudinal polarization, the formation of azimuthal asymmetries used to probe this physics in the case of transverse polarization requires both $e^\pm$ beams to be simultaneously polarized. In this paper we discuss the further use of transverse polarization as a probe of new physics models at a high energy, $\sqrt s=3$ TeV version of CLIC. In particular, we show ($i$) how measurements of the sign of these asymmetries is sufficient to discriminate the production of spin-0 supersymmetric states from the spin-1/2 Kaluza-Klein excitations of Universal Extra Dimensions. Simultaneously, the contribution to this asymmetry arising from the potentially large SM $W^+W^-$ background can be made negligibly small. We then show ($ii$) how measurements of such asymmetries and their associated angular distributions on the peak of a new resonant $Z'$-like state can be used to extract precision information on the $Z'$ couplings to the SM fermions. |
2407.19418 | Zhan Sun | Cong Li, Ying-Zhao Jiang, and Zhan Sun | Studies of $Z$ boson decay into double $\Upsilon$ mesons at the NLO QCD
accuracy | 30 pages, 3 figures, and 3 tables | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper, we employ the nonrelativistic QCD factorization to conduct a
comprehensive examination of the $Z$ boson decay into a pair of $\Upsilon$
mesons, achieving accuracy at the next-to-leading-order (NLO) in $\alpha_s$.
Our calculations demonstrate that the QED diagrams are indispensable in
comparison to the pure QCD diagrams, and the implementation of QCD corrections
markedly enhance the QCD results, whereas it substantially diminish the QED
results. To ensure consistency with the experimental methodology, we have taken
into account the feed-down transitions originating from higher excited states,
which exhibit significant relevance. Combining all the contributions, we arrive
at the NLO prediction of $\mathcal{B}_{Z \to \Upsilon(nS)+\Upsilon(mS)} \sim
10^{-11}$, which is notably lower than the upper limits set by CMS.
| [
{
"created": "Sun, 28 Jul 2024 07:38:36 GMT",
"version": "v1"
}
] | 2024-07-30 | [
[
"Li",
"Cong",
""
],
[
"Jiang",
"Ying-Zhao",
""
],
[
"Sun",
"Zhan",
""
]
] | In this paper, we employ the nonrelativistic QCD factorization to conduct a comprehensive examination of the $Z$ boson decay into a pair of $\Upsilon$ mesons, achieving accuracy at the next-to-leading-order (NLO) in $\alpha_s$. Our calculations demonstrate that the QED diagrams are indispensable in comparison to the pure QCD diagrams, and the implementation of QCD corrections markedly enhance the QCD results, whereas it substantially diminish the QED results. To ensure consistency with the experimental methodology, we have taken into account the feed-down transitions originating from higher excited states, which exhibit significant relevance. Combining all the contributions, we arrive at the NLO prediction of $\mathcal{B}_{Z \to \Upsilon(nS)+\Upsilon(mS)} \sim 10^{-11}$, which is notably lower than the upper limits set by CMS. |
1809.02788 | Pervez Hoodbhoy | Pervez Hoodbhoy | Augmenting the Gauge-Gravity Correspondence to include Hadron
Polarizabilities | 11 pages, explanations added, results unchanged | Phys. Rev. D 98, 086017 (2018) | 10.1103/PhysRevD.98.086017 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | ADS/CFT models have achieved considerable success in describing hadronic
properties such as masses and Regge trajectories. Even if the minimal vertex
that couples photons to structureless spin-zero fields is used, one still ends
up with electromagnetic form factors of hadrons that are in fair to good
agreement with experiment. However, contradicting both experiment and
intuition, this minimal model gives zero for hadronic electric and magnetic
polarizabilities. We show here that if effective vertices are used, and axial
and vector mesons are allowed to propagate as intermediate states, then the
static polarizabilities can in principle be computed from ADS/CFT.
| [
{
"created": "Sat, 8 Sep 2018 11:38:36 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Sep 2018 12:48:30 GMT",
"version": "v2"
}
] | 2018-10-24 | [
[
"Hoodbhoy",
"Pervez",
""
]
] | ADS/CFT models have achieved considerable success in describing hadronic properties such as masses and Regge trajectories. Even if the minimal vertex that couples photons to structureless spin-zero fields is used, one still ends up with electromagnetic form factors of hadrons that are in fair to good agreement with experiment. However, contradicting both experiment and intuition, this minimal model gives zero for hadronic electric and magnetic polarizabilities. We show here that if effective vertices are used, and axial and vector mesons are allowed to propagate as intermediate states, then the static polarizabilities can in principle be computed from ADS/CFT. |
1009.1468 | Eugene Levin | Andrey Kormilitzin and Eugene Levin | Non-linear equation: energy conservation and impact parameter dependence | 24 pp. 8 figures in eps files | Nucl.Phys.A849:98-119,2011 | 10.1016/j.nuclphysa.2010.11.005 | TAUP 2920/10 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we address two questions: how energy conservation affects the
solution to the non-linear equation, and how impact parameter dependence
influences the inclusive production. Answering the first question we solve the
modified BK equation which takes into account energy conservation. In spite of
the fact that we used the simplified kernel, we believe that the main result of
the paper: the small ($\leq 40%$) suppression of the inclusive productiondue to
energy conservation, reflects a general feature. This result leads us to
believe that the small value of the nuclear modification factor is of a
non-perturbative nature. In the solution a new scale appears $Q_{fr} = Q_s
\exp(-1/(2 \bas))$ and the production of dipoles with the size larger than
$2/Q_{fr}$ is suppressed. Therefore, we can expect that the typical temperature
for hadron production is about $Q_{fr}$ ($ T \approx Q_{fr}$). The simplified
equation allows us to obtain a solution to Balitsky-Kovchegov equation taking
into account the impact parameter dependence. We show that the impact parameter
($b$) dependence can be absorbed into the non-perturbative $b$ dependence of
the saturation scale. The solution of the BK equation, as well as of the
modified BK equation without $b$ dependence, is only accurate up to $\pm 25%$.
| [
{
"created": "Wed, 8 Sep 2010 07:41:46 GMT",
"version": "v1"
}
] | 2011-01-17 | [
[
"Kormilitzin",
"Andrey",
""
],
[
"Levin",
"Eugene",
""
]
] | In this paper we address two questions: how energy conservation affects the solution to the non-linear equation, and how impact parameter dependence influences the inclusive production. Answering the first question we solve the modified BK equation which takes into account energy conservation. In spite of the fact that we used the simplified kernel, we believe that the main result of the paper: the small ($\leq 40%$) suppression of the inclusive productiondue to energy conservation, reflects a general feature. This result leads us to believe that the small value of the nuclear modification factor is of a non-perturbative nature. In the solution a new scale appears $Q_{fr} = Q_s \exp(-1/(2 \bas))$ and the production of dipoles with the size larger than $2/Q_{fr}$ is suppressed. Therefore, we can expect that the typical temperature for hadron production is about $Q_{fr}$ ($ T \approx Q_{fr}$). The simplified equation allows us to obtain a solution to Balitsky-Kovchegov equation taking into account the impact parameter dependence. We show that the impact parameter ($b$) dependence can be absorbed into the non-perturbative $b$ dependence of the saturation scale. The solution of the BK equation, as well as of the modified BK equation without $b$ dependence, is only accurate up to $\pm 25%$. |
hep-ph/0504076 | Naomichi Suzuki | N. Suzuki and M. Biyajima | Transverse momentum distribution with radial flow in relativistic
diffusion model | 7 pages, 5 figures and 6 tables | Int.J.Mod.Phys. E16 (2007) 133-148 | 10.1142/S0218301307005582 | null | hep-ph | null | Large transverse momentum distributions of identified particles observed at
RHIC are analyzed by a relativistic stochastic model in the three dimensional
(non-Euclidean) rapidity space. A distribution function obtained from the model
is Gaussian-like in radial rapidity. It can well describe observed transverse
momentum $p_T$ distributions. Estimation of radial flow is made from the
analysis of $p_T$ distributions for $\bar{p}$ in Au + Au Collisions.
Temperatures are estimated from observed large $p_T$ distributions under the
assumption that the distribution function approaches to the Maxwell-Boltzmann
distribution in the lower momentum limit. Power-law behavior of large $p_T$
distribution is also derived from the model.
| [
{
"created": "Mon, 11 Apr 2005 11:29:43 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Suzuki",
"N.",
""
],
[
"Biyajima",
"M.",
""
]
] | Large transverse momentum distributions of identified particles observed at RHIC are analyzed by a relativistic stochastic model in the three dimensional (non-Euclidean) rapidity space. A distribution function obtained from the model is Gaussian-like in radial rapidity. It can well describe observed transverse momentum $p_T$ distributions. Estimation of radial flow is made from the analysis of $p_T$ distributions for $\bar{p}$ in Au + Au Collisions. Temperatures are estimated from observed large $p_T$ distributions under the assumption that the distribution function approaches to the Maxwell-Boltzmann distribution in the lower momentum limit. Power-law behavior of large $p_T$ distribution is also derived from the model. |
1606.03099 | Giovanna Cottin | B. C. Allanach, Marcin Badziak, Giovanna Cottin, Nishita Desai, Cyril
Hugonie and Robert Ziegler | Prompt Signals and Displaced Vertices in Sparticle Searches for
Next-to-Minimal Gauge Mediated Supersymmetric Models | 18 pages, 12 figures, 4 tables. Version accepted for publication in
EPJC | null | 10.1140/epjc/s10052-016-4330-3 | CAVENDISH-HEP-16/10 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the LHC phenomenology of the next-to-minimal model of gauge-mediated
supersymmetry breaking (NMGMSB), both for Run I and Run II. The Higgs
phenomenology of the model is consistent with observations: a 125 GeV Standard
Model-like Higgs which mixes with singlet-like state of mass around 90 GeV that
provides a 2$\sigma$ excess at LEP II. The model possesses regions of parameter
space where a longer-lived lightest neutralino decays in the detector into a
gravitino and a $b-$jet pair or a tau pair. We investigate current lower bounds
on sparticle masses and the discovery potential of the model, both via
conventional sparticle searches and via searches for displaced vertices. The
strongest bound from searches for promptly decaying sparticles yields a lower
limit on the gluino mass of 1080 GeV. An analysis of 100 fb$^{-1}$ from Run II,
on the other hand, is expected to be sensitive up to 1900 GeV. The displaced
vertex searches from Run I suffer from a very low signal efficiency, mainly due
to the presence of $b-$quarks in the final state. We show how the displaced
vertex cuts might be relaxed in order to improve signal efficiency, while
simultaneous prompt objects can be used to cut down background. We find that a
combined search strategy with both prompt and displaced cuts potentially has a
far better sensitivity to this model than either set alone, motivating a fully
fledged experimental study.
| [
{
"created": "Thu, 9 Jun 2016 20:00:19 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Jun 2016 13:15:23 GMT",
"version": "v2"
},
{
"created": "Mon, 22 Aug 2016 14:43:00 GMT",
"version": "v3"
}
] | 2016-09-21 | [
[
"Allanach",
"B. C.",
""
],
[
"Badziak",
"Marcin",
""
],
[
"Cottin",
"Giovanna",
""
],
[
"Desai",
"Nishita",
""
],
[
"Hugonie",
"Cyril",
""
],
[
"Ziegler",
"Robert",
""
]
] | We study the LHC phenomenology of the next-to-minimal model of gauge-mediated supersymmetry breaking (NMGMSB), both for Run I and Run II. The Higgs phenomenology of the model is consistent with observations: a 125 GeV Standard Model-like Higgs which mixes with singlet-like state of mass around 90 GeV that provides a 2$\sigma$ excess at LEP II. The model possesses regions of parameter space where a longer-lived lightest neutralino decays in the detector into a gravitino and a $b-$jet pair or a tau pair. We investigate current lower bounds on sparticle masses and the discovery potential of the model, both via conventional sparticle searches and via searches for displaced vertices. The strongest bound from searches for promptly decaying sparticles yields a lower limit on the gluino mass of 1080 GeV. An analysis of 100 fb$^{-1}$ from Run II, on the other hand, is expected to be sensitive up to 1900 GeV. The displaced vertex searches from Run I suffer from a very low signal efficiency, mainly due to the presence of $b-$quarks in the final state. We show how the displaced vertex cuts might be relaxed in order to improve signal efficiency, while simultaneous prompt objects can be used to cut down background. We find that a combined search strategy with both prompt and displaced cuts potentially has a far better sensitivity to this model than either set alone, motivating a fully fledged experimental study. |
1109.6667 | Qiang Yuan | Xiao-Jun Bi, Peng-Fei Yin, Zhao-Huan Yu, Qiang Yuan | Constraints and tests of the OPERA superluminal neutrinos | 5 pages (2 column), 4 figures; published in Phys. Rev. Lett | Phys. Rev. Lett. 107, 241802 (2011) | 10.1103/PhysRevLett.107.241802 | null | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The superluminal neutrinos detected by OPERA indicates Lorentz invariance
violation (LIV) of the neutrino sector at the order of $10^{-5}$. We study the
implications of the result in this work. We find that such a large LIV implied
by OPERA data will make the neutrino production process $\pi \to \mu + \nu_\mu$
kinematically forbidden for neutrino energy greater than about 5 GeV. The OPERA
detection of neutrinos at 40 GeV can constrain the LIV parameter to be smaller
than $3\times 10^{-7}$. Furthermore the neutrino decay in the LIV framework
will modify the neutrino spectrum greatly. The atmospheric neutrino spectrum
measured by IceCube can constrain the LIV parameter to the level of $10^{-12}$.
The future detection of astrophysical neutrinos of Galactic sources is expected
to be able to give even stronger constraint on the LIV parameter of neutrinos.
| [
{
"created": "Thu, 29 Sep 2011 20:33:57 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Oct 2011 17:04:29 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Dec 2011 06:19:44 GMT",
"version": "v3"
}
] | 2015-03-19 | [
[
"Bi",
"Xiao-Jun",
""
],
[
"Yin",
"Peng-Fei",
""
],
[
"Yu",
"Zhao-Huan",
""
],
[
"Yuan",
"Qiang",
""
]
] | The superluminal neutrinos detected by OPERA indicates Lorentz invariance violation (LIV) of the neutrino sector at the order of $10^{-5}$. We study the implications of the result in this work. We find that such a large LIV implied by OPERA data will make the neutrino production process $\pi \to \mu + \nu_\mu$ kinematically forbidden for neutrino energy greater than about 5 GeV. The OPERA detection of neutrinos at 40 GeV can constrain the LIV parameter to be smaller than $3\times 10^{-7}$. Furthermore the neutrino decay in the LIV framework will modify the neutrino spectrum greatly. The atmospheric neutrino spectrum measured by IceCube can constrain the LIV parameter to the level of $10^{-12}$. The future detection of astrophysical neutrinos of Galactic sources is expected to be able to give even stronger constraint on the LIV parameter of neutrinos. |
1909.07387 | Ningqiang Song | Amit Bhoonah, Joseph Bramante, Ningqiang Song | Superradiant Searches for Dark Photons in Two Stage Atomic Transitions | 43 pages, 11 figures. Added discussions on decoherence effects and
the sensitivity corresponding to larger target number density. Matched
published version | Phys. Rev. D 101, 055040 (2020) | 10.1103/PhysRevD.101.055040 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a new mechanism to discover dark photon fields, by resonantly
triggering two photon transitions in cold gas preparations. Using coherently
prepared cold parahydrogen, coupling sensitivity for sub-meV mass dark photon
fields can be advanced by orders of magnitude, with a modified
light-shining-through-wall setup. We calculate the effect of a background dark
photon field on the dipole moment and corresponding transition rate of cold
parahydrogen pumped into its first vibrational excited state by
counter-propagating laser beams. The nonlinear amplification of two photon
emission triggered by dark photons in a cold parahydrogen sample is numerically
simulated to obtain the expected dark photon coupling sensitivity.
| [
{
"created": "Mon, 16 Sep 2019 18:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Mar 2020 21:48:16 GMT",
"version": "v2"
}
] | 2020-04-08 | [
[
"Bhoonah",
"Amit",
""
],
[
"Bramante",
"Joseph",
""
],
[
"Song",
"Ningqiang",
""
]
] | We study a new mechanism to discover dark photon fields, by resonantly triggering two photon transitions in cold gas preparations. Using coherently prepared cold parahydrogen, coupling sensitivity for sub-meV mass dark photon fields can be advanced by orders of magnitude, with a modified light-shining-through-wall setup. We calculate the effect of a background dark photon field on the dipole moment and corresponding transition rate of cold parahydrogen pumped into its first vibrational excited state by counter-propagating laser beams. The nonlinear amplification of two photon emission triggered by dark photons in a cold parahydrogen sample is numerically simulated to obtain the expected dark photon coupling sensitivity. |
1609.01605 | Teppei Kitahara | Teppei Kitahara, Yasuhiro Yamamoto | Protophobic Light Vector Boson as a Mediator to the Dark Sector | 7 pages, 7 figures; version published in PRD | Phys. Rev. D 95, 015008 (2017) | 10.1103/PhysRevD.95.015008 | OU-HET-909, TTP16-036 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observation of a protophobic 16.7 MeV vector boson has been reported by a
$^8$Be nuclear transition experiment. Such a new particle could mediate between
the Standard Model and a dark sector, which includes the dark matter. In this
paper, we show some simple models of the dark matter which satisfy the thermal
relic abundance under the current experimental bounds from the direct and the
indirect detections. In a model, it is found that an appropriate
self-scattering cross section to solve the small scale structure puzzles can be
achieved.
| [
{
"created": "Tue, 6 Sep 2016 15:25:44 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Jan 2017 13:54:36 GMT",
"version": "v2"
}
] | 2017-01-13 | [
[
"Kitahara",
"Teppei",
""
],
[
"Yamamoto",
"Yasuhiro",
""
]
] | The observation of a protophobic 16.7 MeV vector boson has been reported by a $^8$Be nuclear transition experiment. Such a new particle could mediate between the Standard Model and a dark sector, which includes the dark matter. In this paper, we show some simple models of the dark matter which satisfy the thermal relic abundance under the current experimental bounds from the direct and the indirect detections. In a model, it is found that an appropriate self-scattering cross section to solve the small scale structure puzzles can be achieved. |
hep-ph/0412214 | Sven Heinemeyer | S. Heinemeyer, W. Hollik, G. Weiglein | Electroweak Precision Observables in the Minimal Supersymmetric Standard
Model | 145 pages, lots of figures | Phys.Rept.425:265-368,2006 | 10.1016/j.physrep.2005.12.002 | CERN-PH-TH/2004-224, DCPT/04/162, IPPP/04/81, MPP-2004-145 | hep-ph | null | The current status of electroweak precision observables in the Minimal
Supersymmetric Standard Model (MSSM) is reviewed. We focus in particular on the
$W$ boson mass, M_W, the effective leptonic weak mixing angle, sin^2 theta_eff,
the anomalous magnetic moment of the muon, (g-2)_\mu, and the lightest CP-even
MSSM Higgs boson mass, m_h. We summarize the current experimental situation and
the status of the theoretical evaluations. An estimate of the current
theoretical uncertainties from unknown higher-order corrections and from the
experimental errors of the input parameters is given. We discuss future
prospects for both the experimental accuracies and the precision of the
theoretical predictions. Confronting the precision data with the theory
predictions within the unconstrained MSSM and within specific SUSY-breaking
scenarios, we analyse how well the data are described by the theory. The mSUGRA
scenario with cosmological constraints yields a very good fit to the data,
showing a clear preference for a relatively light mass scale of the SUSY
particles. The constraints on the parameter space from the precision data is
discussed, and it is shown that the prospective accuracy at the next generation
of colliders will enhance the sensitivity of the precision tests very
significantly.
| [
{
"created": "Wed, 15 Dec 2004 14:59:19 GMT",
"version": "v1"
}
] | 2010-12-16 | [
[
"Heinemeyer",
"S.",
""
],
[
"Hollik",
"W.",
""
],
[
"Weiglein",
"G.",
""
]
] | The current status of electroweak precision observables in the Minimal Supersymmetric Standard Model (MSSM) is reviewed. We focus in particular on the $W$ boson mass, M_W, the effective leptonic weak mixing angle, sin^2 theta_eff, the anomalous magnetic moment of the muon, (g-2)_\mu, and the lightest CP-even MSSM Higgs boson mass, m_h. We summarize the current experimental situation and the status of the theoretical evaluations. An estimate of the current theoretical uncertainties from unknown higher-order corrections and from the experimental errors of the input parameters is given. We discuss future prospects for both the experimental accuracies and the precision of the theoretical predictions. Confronting the precision data with the theory predictions within the unconstrained MSSM and within specific SUSY-breaking scenarios, we analyse how well the data are described by the theory. The mSUGRA scenario with cosmological constraints yields a very good fit to the data, showing a clear preference for a relatively light mass scale of the SUSY particles. The constraints on the parameter space from the precision data is discussed, and it is shown that the prospective accuracy at the next generation of colliders will enhance the sensitivity of the precision tests very significantly. |
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