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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2012.07894 | Luc Darm\'e | Luc Darm\'e, Federica Giacchino, Enrico Nardi, Mauro Raggi | Invisible decays of axion-like particles: constraints and prospects | 42 pages, 15 figures. Minor points clarified, a few typos fixed,
results unchanged | null | 10.1007/JHEP06(2021)009 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Axion-like particles (ALPs) can provide a portal to new states of a dark
sector. We study the phenomenology of this portal when the ALP mainly decays
invisibly, while its interaction with the standard model sector proceeds
essentially via its coupling to electrons and/or photons. We re-analyse
existing limits from various collider and beam dump experiments, including in
particular ALP production via electron/positron interactions, in addition to
the usual production through ALP-photon coupling. We further discuss the
interplay between these limits and the intriguing possibility of explaining
simultaneously the muon and electron magnetic moment anomalies. Finally, we
illustrate the prospects of ALP searches at the LNF positron fixed-target
experiment PADME, and the future reach of an upgraded experimental setup.
| [
{
"created": "Mon, 14 Dec 2020 19:20:35 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Jan 2021 16:01:44 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Apr 2021 17:19:38 GMT",
"version": "v3"
}
] | 2021-06-16 | [
[
"Darmé",
"Luc",
""
],
[
"Giacchino",
"Federica",
""
],
[
"Nardi",
"Enrico",
""
],
[
"Raggi",
"Mauro",
""
]
] | Axion-like particles (ALPs) can provide a portal to new states of a dark sector. We study the phenomenology of this portal when the ALP mainly decays invisibly, while its interaction with the standard model sector proceeds essentially via its coupling to electrons and/or photons. We re-analyse existing limits from various collider and beam dump experiments, including in particular ALP production via electron/positron interactions, in addition to the usual production through ALP-photon coupling. We further discuss the interplay between these limits and the intriguing possibility of explaining simultaneously the muon and electron magnetic moment anomalies. Finally, we illustrate the prospects of ALP searches at the LNF positron fixed-target experiment PADME, and the future reach of an upgraded experimental setup. |
1205.4547 | Georgios Gounaris | G. J. Gounaris and F. M. Renard | A supersimple analysis of $e^-e^+\to t \bar t$ at high energy | 26 pages, 15 figures. Paper appeared in Phys. Rev. D. The Journal
where Reference 20 has appeared has been added | null | 10.1103/PhysRevD.86.013003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | According to supersimplicity in MSSM, a renormalization scheme (SRS) may be
defined for any high energy 2-to-2 process, to the 1loop EW order; where the
helicity conserving (HC) amplitudes, are expressed as a linear combination of
just three universal logarithm-involving forms.
All other helicity amplitudes vanish asymptotically. Including to these SRS
amplitudes the corresponding counter terms, the "supersimple" expressions for
the high energy HC amplitudes, renormalized on-shell, are obtained.
Previously, this property was noted for a large number of processes that do
not involve Yukawa interactions or renormalization group corrections. Here we
extend it to $e^-e^+\to t \bar t$, which does involve large Yukawa and
renormalization group contributions. We show that the resulting "supersimple"
expressions may provide an accurate description, even at energies comparable to
the SUSY scale. Such descriptions clearly identify the origin of the important
SUSY effects, and they may be used for quickly constraining physics
contributions, beyond MSSM.
| [
{
"created": "Mon, 21 May 2012 10:12:24 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jun 2012 14:09:41 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Jul 2012 15:17:33 GMT",
"version": "v3"
}
] | 2015-06-05 | [
[
"Gounaris",
"G. J.",
""
],
[
"Renard",
"F. M.",
""
]
] | According to supersimplicity in MSSM, a renormalization scheme (SRS) may be defined for any high energy 2-to-2 process, to the 1loop EW order; where the helicity conserving (HC) amplitudes, are expressed as a linear combination of just three universal logarithm-involving forms. All other helicity amplitudes vanish asymptotically. Including to these SRS amplitudes the corresponding counter terms, the "supersimple" expressions for the high energy HC amplitudes, renormalized on-shell, are obtained. Previously, this property was noted for a large number of processes that do not involve Yukawa interactions or renormalization group corrections. Here we extend it to $e^-e^+\to t \bar t$, which does involve large Yukawa and renormalization group contributions. We show that the resulting "supersimple" expressions may provide an accurate description, even at energies comparable to the SUSY scale. Such descriptions clearly identify the origin of the important SUSY effects, and they may be used for quickly constraining physics contributions, beyond MSSM. |
1602.05495 | Genevieve Belanger | G. Belanger, V. Bizouard, F. Boudjema, G. Chalons | One-loop renormalisation of the NMSSM in SloopS : 1. the
neutralino-chargino and sfermion sectors | 44 pages | Phys. Rev. D 93, 115031 (2016) | 10.1103/PhysRevD.93.115031 | LAPTh-009/16, LPSC16022 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have completed the one-loop renormalisation of the Next-to-Minimal
Supersymmetric Standard Model (NMSSM) allowing for and comparing between
different renormalisation schemes. A special attention is paid to on-shell
schemes. We study a variety of these schemes based on alternative choices of
the physical input parameters. In this paper we present our approach to the
renormalisation of the NMSSM and report on our results for the
neutralino-chargino and sfermion sectors. We will borrow some results from our
study of the Higgs sector whose full discussion is left for a separate
publication. We have implemented the set up for all the sectors of the NMSSM
within \sloops, a code for the automatic computation of one-loop corrections
initially developed for the standard model and the MSSM. Among the many
applications that allows the code, we present here the one-loop corrections to
neutralino masses and to partial widths of neutralinos and charginos into final
states with one gauge boson. One-loop electroweak and QCD corrections to the
partial widths of third generation sfermions into a fermion and a chargino or a
neutralino are also computed.
| [
{
"created": "Wed, 17 Feb 2016 17:22:15 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Mar 2016 17:23:03 GMT",
"version": "v2"
}
] | 2016-06-29 | [
[
"Belanger",
"G.",
""
],
[
"Bizouard",
"V.",
""
],
[
"Boudjema",
"F.",
""
],
[
"Chalons",
"G.",
""
]
] | We have completed the one-loop renormalisation of the Next-to-Minimal Supersymmetric Standard Model (NMSSM) allowing for and comparing between different renormalisation schemes. A special attention is paid to on-shell schemes. We study a variety of these schemes based on alternative choices of the physical input parameters. In this paper we present our approach to the renormalisation of the NMSSM and report on our results for the neutralino-chargino and sfermion sectors. We will borrow some results from our study of the Higgs sector whose full discussion is left for a separate publication. We have implemented the set up for all the sectors of the NMSSM within \sloops, a code for the automatic computation of one-loop corrections initially developed for the standard model and the MSSM. Among the many applications that allows the code, we present here the one-loop corrections to neutralino masses and to partial widths of neutralinos and charginos into final states with one gauge boson. One-loop electroweak and QCD corrections to the partial widths of third generation sfermions into a fermion and a chargino or a neutralino are also computed. |
hep-ph/0601099 | Muge Boz | Muge Boz and Namik K. Pak | The Neutralino Mass: Correlation With The Charginos | 14 pages, 16 figures | Mod.Phys.Lett. A21 (2006) 1609-1624 | 10.1142/S0217732306019724 | null | hep-ph | null | As the fundamental SU(2) supersymmetric parameters can be determined in the
chargino sector, and the remaining fundamental parameters of the minimal
supersymmetric extensions of the standard model can be analyzed in the
neutralino sector, the two sectors can be correlated via these parameters. We
have shown that for the CP conserving case, the masses of all the neutralinos
can be determined in terms of the chargino masses, and $\tan\beta$. In this
case the neutralino masses are quite insensitive to the variations of
$\tan\beta$; they change by about $%15$ when $\tan\beta$ varies in the range
from 5 to 50. In the CP violating case, the neutralino masses are found to be
quite sensitive to the variations of the CP violating phase. For the heavier
neutralinos the dependence of the masses to the CP violating phase show
complementary behaviour at CP violating points.
| [
{
"created": "Thu, 12 Jan 2006 13:55:45 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Boz",
"Muge",
""
],
[
"Pak",
"Namik K.",
""
]
] | As the fundamental SU(2) supersymmetric parameters can be determined in the chargino sector, and the remaining fundamental parameters of the minimal supersymmetric extensions of the standard model can be analyzed in the neutralino sector, the two sectors can be correlated via these parameters. We have shown that for the CP conserving case, the masses of all the neutralinos can be determined in terms of the chargino masses, and $\tan\beta$. In this case the neutralino masses are quite insensitive to the variations of $\tan\beta$; they change by about $%15$ when $\tan\beta$ varies in the range from 5 to 50. In the CP violating case, the neutralino masses are found to be quite sensitive to the variations of the CP violating phase. For the heavier neutralinos the dependence of the masses to the CP violating phase show complementary behaviour at CP violating points. |
0905.1387 | Hisakazu Minakata | Hisakazu Minakata | Neutrino's Non-Standard Interactions; Another Eel under a Willow? | 24 pages, 8 (all new!) figures. Written version of a talk presented
at XIII International Workshop on Neutrino Telescopes, Istituto Veneto di
Scienze, Lettere ed Arti, Venice, Italy, March 10-13, 2009 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I report some progress that occurred since NO-VE08 in the field of
non-standard interactions (NSI) of neutrinos. After briefly reviewing
theoretical developments, I give a summary of the two works in which I was
involved. Firstly, we have formulated a perturbative framework to illuminate
the global features of neutrino oscillations with NSI, aiming at exploring
method for determination of the standard mixing and the NSI parameters. We have
recognized that the parameter degeneracy prevails with an extended form which
involves the NSI elements. Furthermore, a completely new type of degeneracy is
shown to exist. The nature of the former degeneracy is analyzed in detail in
the second work. The work is primarily devoted to analyze the problem of
discriminating the two CP violation, one due to the lepton Kobayashi-Maskawa
phase and the other by phases of the NSI elements. We have shown that the near
(3000 km)-far (7000 km) two detector setting in neutrino factory does have the
discrimination capability and is sensitivities to CP violation due to NSI to
|epsilon_{e\mu}| to \simeq several x 10^{-4} in most of the region of \delta
and \phi.
| [
{
"created": "Sat, 9 May 2009 11:16:50 GMT",
"version": "v1"
}
] | 2009-05-12 | [
[
"Minakata",
"Hisakazu",
""
]
] | I report some progress that occurred since NO-VE08 in the field of non-standard interactions (NSI) of neutrinos. After briefly reviewing theoretical developments, I give a summary of the two works in which I was involved. Firstly, we have formulated a perturbative framework to illuminate the global features of neutrino oscillations with NSI, aiming at exploring method for determination of the standard mixing and the NSI parameters. We have recognized that the parameter degeneracy prevails with an extended form which involves the NSI elements. Furthermore, a completely new type of degeneracy is shown to exist. The nature of the former degeneracy is analyzed in detail in the second work. The work is primarily devoted to analyze the problem of discriminating the two CP violation, one due to the lepton Kobayashi-Maskawa phase and the other by phases of the NSI elements. We have shown that the near (3000 km)-far (7000 km) two detector setting in neutrino factory does have the discrimination capability and is sensitivities to CP violation due to NSI to |epsilon_{e\mu}| to \simeq several x 10^{-4} in most of the region of \delta and \phi. |
hep-ph/0607218 | Pedro Bicudo | Marco Cardoso, Pedro Bicudo, Pedro D. Sacramento | Confinement of monopole field lines in a superconductor at T=/=0 | 11 pages, 10 figures | AnnalsPhys.323:337-355,2008 | 10.1016/j.aop.2007.02.007 | null | hep-ph | null | We apply the Bogoliubov-de Gennes equations to the confinement of a
monopole-antimonopole pair in a superconductor. This is related to the problem
of a quark-antiquark pair bound by a confining string, consisting of a
colour-electric flux tube, dual to the magnetic vortex of type-II
superconductors. We study the confinement of the field lines due to the
superconducting state and calculate the effective potential between the two
monopoles. At short distances the potential is Coulombic and at large distances
the potential is linear, as previously determined solving the Ginzburg-Landau
equations. The magnetic field lines and the string tension are also studied as
a function of the temperature $T$. Because we take into account the explicit
fermionic degrees of freedom, this work may open new perspectives to the
breaking of chiral symmetry or to colour superconductivity.
| [
{
"created": "Thu, 20 Jul 2006 04:13:06 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Cardoso",
"Marco",
""
],
[
"Bicudo",
"Pedro",
""
],
[
"Sacramento",
"Pedro D.",
""
]
] | We apply the Bogoliubov-de Gennes equations to the confinement of a monopole-antimonopole pair in a superconductor. This is related to the problem of a quark-antiquark pair bound by a confining string, consisting of a colour-electric flux tube, dual to the magnetic vortex of type-II superconductors. We study the confinement of the field lines due to the superconducting state and calculate the effective potential between the two monopoles. At short distances the potential is Coulombic and at large distances the potential is linear, as previously determined solving the Ginzburg-Landau equations. The magnetic field lines and the string tension are also studied as a function of the temperature $T$. Because we take into account the explicit fermionic degrees of freedom, this work may open new perspectives to the breaking of chiral symmetry or to colour superconductivity. |
1503.08675 | Andreas Otto | Andreas Otto, Daniel Seipt, David Blaschke, Stanislav Alexandrovich
Smolyansky, Burkhard K\"ampfer | Dynamical Schwinger process in a bifrequent electric field of finite
duration: survey on amplification | null | Phys. Rev. D 91, 105018 (2015) | 10.1103/PhysRevD.91.105018 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The electron-positron pair production due to the dynamical Schwinger process
in a slowly oscillating strong electric field is enhanced by the superposition
of a rapidly oscillating weaker electric field. A systematic account of the
enhancement by the resulting bifrequent field is provided for the residual
phase space distribution. The enhancement is explained by a severe reduction of
the suppression in both the tunneling and multiphoton regimes.
| [
{
"created": "Mon, 30 Mar 2015 14:01:40 GMT",
"version": "v1"
}
] | 2015-05-27 | [
[
"Otto",
"Andreas",
""
],
[
"Seipt",
"Daniel",
""
],
[
"Blaschke",
"David",
""
],
[
"Smolyansky",
"Stanislav Alexandrovich",
""
],
[
"Kämpfer",
"Burkhard",
""
]
] | The electron-positron pair production due to the dynamical Schwinger process in a slowly oscillating strong electric field is enhanced by the superposition of a rapidly oscillating weaker electric field. A systematic account of the enhancement by the resulting bifrequent field is provided for the residual phase space distribution. The enhancement is explained by a severe reduction of the suppression in both the tunneling and multiphoton regimes. |
hep-ph/0504144 | Fran\c{c}ois Gelis | Jean-Paul Blaizot, Francois Gelis | Photon and dilepton production in the Quark-Gluon plasma: perturbation
theory vs lattice QCD | Talk given at Hard Probes 2004, 6 pages, 8 figures | Eur.Phys.J.C43:375-380,2005 | 10.1140/epjc/s2005-02292-y | ECT-05-04, SPhT-T05/054 | hep-ph | null | This talk reviews the status of QCD calculations of photon and dilepton
production rates in a Quark-Gluon plasma. Theses rates are known to order
${\cal O}(\alpha_s)$. Their calculations involve various resummations to
account for well identified physical effects that are briefly described.
Lattice calculations of the spectral functions give also access to the dilepton
rates. Comparison with perturbative results points to inconsistencies in both
approaches when the dilepton energy becomes small.
| [
{
"created": "Sun, 17 Apr 2005 21:18:28 GMT",
"version": "v1"
}
] | 2009-01-07 | [
[
"Blaizot",
"Jean-Paul",
""
],
[
"Gelis",
"Francois",
""
]
] | This talk reviews the status of QCD calculations of photon and dilepton production rates in a Quark-Gluon plasma. Theses rates are known to order ${\cal O}(\alpha_s)$. Their calculations involve various resummations to account for well identified physical effects that are briefly described. Lattice calculations of the spectral functions give also access to the dilepton rates. Comparison with perturbative results points to inconsistencies in both approaches when the dilepton energy becomes small. |
0705.0327 | Ernest Ma | Ernest Ma (UC Riverside) | Non-Abelian Discrete Flavor Symmetries | 12pages, no figure, one correction | null | null | UCRHEP-T31 (June 2007) | hep-ph | null | This is an incomplete survey of some non-Abelian discrete symmetries which
have been used recently in attempts to understand the flavor structure of
leptons and quarks. To support such symmetries, new scalar particles are
required. In some models, they are very massive, in which case there may not be
much of a trace of their existence at the TeV scale. In other models, they are
themselves at the TeV scale, in which case there is a reasonable chance for
them to be revealed at the LHC (Large Hadron Collider) at CERN.
| [
{
"created": "Wed, 2 May 2007 16:47:03 GMT",
"version": "v1"
},
{
"created": "Mon, 21 May 2007 17:52:42 GMT",
"version": "v2"
},
{
"created": "Tue, 19 Jun 2007 16:00:38 GMT",
"version": "v3"
},
{
"created": "Thu, 26 Jul 2007 19:07:14 GMT",
"version": "v4"
}
] | 2007-07-26 | [
[
"Ma",
"Ernest",
"",
"UC Riverside"
]
] | This is an incomplete survey of some non-Abelian discrete symmetries which have been used recently in attempts to understand the flavor structure of leptons and quarks. To support such symmetries, new scalar particles are required. In some models, they are very massive, in which case there may not be much of a trace of their existence at the TeV scale. In other models, they are themselves at the TeV scale, in which case there is a reasonable chance for them to be revealed at the LHC (Large Hadron Collider) at CERN. |
hep-ph/0212051 | K. Zuber | S.Pakvasa, K.Zuber | Possible improvements on the mass of the tau neutrino using leptonic
$D^\pm_s$ decays | 1 typo in Eq.2 corrected | Phys.Lett. B566 (2003) 207-209 | 10.1016/S0370-2693(03)00563-X | null | hep-ph | null | We show how a very accurate measurement of the branching ratios of the
leptonic decay modes of the $D^\pm_s$ mesons can lead to a significant
improvement in the mass limit for the tau neutrino.
| [
{
"created": "Tue, 3 Dec 2002 17:29:42 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Mar 2003 19:30:21 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Apr 2003 13:33:51 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Pakvasa",
"S.",
""
],
[
"Zuber",
"K.",
""
]
] | We show how a very accurate measurement of the branching ratios of the leptonic decay modes of the $D^\pm_s$ mesons can lead to a significant improvement in the mass limit for the tau neutrino. |
0810.4110 | Chuan-Ren Chen | Chuan-Ren Chen and Fuminobu Takahashi | Cosmic rays from Leptonic Dark Matter | 21 pages, 4 figures, 2 tables, updated plots including PAMELA data | JCAP02(2009)004 | 10.1088/1475-7516/2009/02/004 | IPMU 08-0071 | hep-ph astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If dark matter possesses a lepton number, it is natural to expect the
dark-matter annihilation and/or decay mainly produces the standard model
leptons, while negligible amount of the antiproton is produced. To illustrate
such a simple idea, we consider a scenario that a right-handed sneutrino dark
matter decays into the standard model particles through tiny R-parity violating
interactions. Interestingly enough, charged leptons as well as neutrinos are
directly produced, and they can lead to a sharp peak in the predicted positron
fraction. Moreover, the decay of the right-handed sneutrino also generates
diffuse continuum gamma rays which may account for the excess observed by
EGRET, while the primary antiproton flux can be suppressed. Those predictions
on the cosmic-ray fluxes of the positrons, gamma rays and antiprotons will be
tested by the PAMELA and FGST observatories.
| [
{
"created": "Wed, 22 Oct 2008 17:04:11 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Dec 2008 07:37:18 GMT",
"version": "v2"
}
] | 2009-03-04 | [
[
"Chen",
"Chuan-Ren",
""
],
[
"Takahashi",
"Fuminobu",
""
]
] | If dark matter possesses a lepton number, it is natural to expect the dark-matter annihilation and/or decay mainly produces the standard model leptons, while negligible amount of the antiproton is produced. To illustrate such a simple idea, we consider a scenario that a right-handed sneutrino dark matter decays into the standard model particles through tiny R-parity violating interactions. Interestingly enough, charged leptons as well as neutrinos are directly produced, and they can lead to a sharp peak in the predicted positron fraction. Moreover, the decay of the right-handed sneutrino also generates diffuse continuum gamma rays which may account for the excess observed by EGRET, while the primary antiproton flux can be suppressed. Those predictions on the cosmic-ray fluxes of the positrons, gamma rays and antiprotons will be tested by the PAMELA and FGST observatories. |
hep-ph/9704449 | Edward Shuryak | E.V. Shuryak (Stony Brook) | Physics of Heavy Ions Collisions: The Summary of Moriond-97 | null | null | null | null | hep-ph | null | CERN dilepton experiments have provided the most exciting data. Strong
enhancement at low masses observed by CERES and HELIOS3 indicate strong
modification in the vector channel in matter compared to vacuum properties.
NA50 data on $J/\psi$ suppression in PbPb collisions show surprising deviation
from the previous trend. The question is whether it is the expected early-time
signal of QGP, or due to late-time hadronic interactions.
Theoretical and experimental suggestions have been made to resolve this
issue. BNL and SPS experiments have also provided rather complete data with
heavy beams (Au and Pb, respectively). Very strong collective flow effects have
been observed at both energies, which allow for the first time to restrict the
EOS of the hadronic matter. Several observables (flow, Coulomb effects and HBT)
suggest rather long evolution of systems created in heavy ion collisions and
very low freeze-out densities relative to previous studies. Theory of jet
stopping in QGP is becoming quantitative.
| [
{
"created": "Wed, 30 Apr 1997 16:02:18 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Shuryak",
"E. V.",
"",
"Stony Brook"
]
] | CERN dilepton experiments have provided the most exciting data. Strong enhancement at low masses observed by CERES and HELIOS3 indicate strong modification in the vector channel in matter compared to vacuum properties. NA50 data on $J/\psi$ suppression in PbPb collisions show surprising deviation from the previous trend. The question is whether it is the expected early-time signal of QGP, or due to late-time hadronic interactions. Theoretical and experimental suggestions have been made to resolve this issue. BNL and SPS experiments have also provided rather complete data with heavy beams (Au and Pb, respectively). Very strong collective flow effects have been observed at both energies, which allow for the first time to restrict the EOS of the hadronic matter. Several observables (flow, Coulomb effects and HBT) suggest rather long evolution of systems created in heavy ion collisions and very low freeze-out densities relative to previous studies. Theory of jet stopping in QGP is becoming quantitative. |
hep-ph/0004066 | Basarab Nicolescu | Pierre Gauron, Basarab Nicolescu | A Possible Two-Component Structure of the Non-Perturbative Pomeron | 7 pages, 2 tables, 4 figures | Phys.Lett. B486 (2000) 71-76 | 10.1016/S0370-2693(00)00736-X | LPNHE 00-02 | hep-ph | null | We propose a QCD-inspired two-component Pomeron form which gives an excellent
description of the proton-proton, pi-proton, kaon-proton, gamma-proton and
gamma-gamma total cross sections. Our fit has a better CHI2/dof for a smaller
number of parameters as compared with the PDG fit. Our 2-Pomeron form is fully
compatible with weak Regge exchange-degeneracy, universality, Regge
factorization and the generalized vector dominance model.
| [
{
"created": "Fri, 7 Apr 2000 11:10:48 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Gauron",
"Pierre",
""
],
[
"Nicolescu",
"Basarab",
""
]
] | We propose a QCD-inspired two-component Pomeron form which gives an excellent description of the proton-proton, pi-proton, kaon-proton, gamma-proton and gamma-gamma total cross sections. Our fit has a better CHI2/dof for a smaller number of parameters as compared with the PDG fit. Our 2-Pomeron form is fully compatible with weak Regge exchange-degeneracy, universality, Regge factorization and the generalized vector dominance model. |
1209.0799 | Kirill Tuchin | Kirill Tuchin | Beyond the proton collinear factorization in heavy quark production in
pA collisions at low x | 16 pages, 3 figures; v2: minor corrections and additions | null | 10.1016/j.nuclphysa.2013.01.005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider heavy quark production in high energy pA collisions and
investigate the contribution of interactions of valence quarks of proton with
the nucleus. The often made assumption that valence quarks of proton can be
factored out is justified only if the nucleus saturation momentum is much
smaller than the heavy quark mass. This is not the case in phenomenologically
relevant situations. Breakdown of factorization manifests itself in substantial
decrease of the cross section at large total and small relative transverse
momenta of the heavy quark -antiquark pair.
| [
{
"created": "Tue, 4 Sep 2012 20:58:20 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Sep 2012 13:48:06 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Tuchin",
"Kirill",
""
]
] | We consider heavy quark production in high energy pA collisions and investigate the contribution of interactions of valence quarks of proton with the nucleus. The often made assumption that valence quarks of proton can be factored out is justified only if the nucleus saturation momentum is much smaller than the heavy quark mass. This is not the case in phenomenologically relevant situations. Breakdown of factorization manifests itself in substantial decrease of the cross section at large total and small relative transverse momenta of the heavy quark -antiquark pair. |
0908.4392 | Andrey Grozin | A. G. Grozin | Introduction to effective field theories. 1. Heisenberg-Euler effective
theory, decoupling of heavy flavours | Lectures at the Helmholtz International School-Workshop "Calculations
for modern and future colliders", Dubna, July 10-20, 2009; 47 pages | null | null | TTP09-21, SFB/CPP-09-58 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is the first part of lectures about effective field theories. Decoupling
of heavy-particle loops is considered (heavy leptons in QED, heavy quarks in
QCD).
| [
{
"created": "Sun, 30 Aug 2009 12:41:04 GMT",
"version": "v1"
}
] | 2009-09-01 | [
[
"Grozin",
"A. G.",
""
]
] | This is the first part of lectures about effective field theories. Decoupling of heavy-particle loops is considered (heavy leptons in QED, heavy quarks in QCD). |
0810.5167 | Christopher Spitzer | Ann E. Nelson, Christopher Spitzer | Slightly Non-Minimal Dark Matter in PAMELA and ATIC | 7 pages, 6 figures, v3: updated for new data, added discussion of
Fermi | JHEP 1010:066,2010 | 10.1007/JHEP10(2010)066 | null | hep-ph astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a simple model in which dark matter couples to the standard model
through a light scalar intermediary that is itself unstable. We find this model
has several notable features, and allows a natural explanation for a surplus of
positrons, but no surplus of anti-protons, as has been suggested by early data
from PAMELA and ATIC. Moreover, this model yields a very small nucleon
coupling, well below the direct detection limits. In this paper we explore the
effect of this model in both the early universe and in the galaxy.
| [
{
"created": "Wed, 29 Oct 2008 17:35:10 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Oct 2008 07:35:01 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Jul 2010 15:32:39 GMT",
"version": "v3"
}
] | 2015-03-13 | [
[
"Nelson",
"Ann E.",
""
],
[
"Spitzer",
"Christopher",
""
]
] | We present a simple model in which dark matter couples to the standard model through a light scalar intermediary that is itself unstable. We find this model has several notable features, and allows a natural explanation for a surplus of positrons, but no surplus of anti-protons, as has been suggested by early data from PAMELA and ATIC. Moreover, this model yields a very small nucleon coupling, well below the direct detection limits. In this paper we explore the effect of this model in both the early universe and in the galaxy. |
2105.13851 | Zeren Simon Wang | Giovanna Cottin, Juan Carlos Helo, Martin Hirsch, Arsenii Titov, Zeren
Simon Wang | Heavy neutral leptons in effective field theory and the high-luminosity
LHC | v1, 36 pages, 9 figures, 2 tables, and 2 appendices; v2, minor
changes, accepted for publication in JHEP | JHEP 09 (2021) 039 | 10.1007/JHEP09(2021)039 | FTUV-21-0528.5219, IFIC/21-18 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Heavy neutral leptons (HNLs) with masses around the electroweak scale are
expected to be rather long-lived particles, as a result of the observed
smallness of the active neutrino masses. In this work, we study long-lived HNLs
in $N_R$SMEFT, a Standard Model (SM) extension with singlet fermions to which
we add non-renormalizable operators up to dimension-6. Operators which contain
two HNLs can lead to a sizable enhancement of the production cross sections,
compared to the minimal case where HNLs are produced only via their mixing with
the SM neutrinos. We calculate the expected sensitivities for the ATLAS
detector and the future far-detector experiments: AL3X, ANUBIS, CODEX-b, FASER,
MATHUSLA, and MoEDAL-MAPP in this setup. The sensitive ranges of the HNL mass
and of the active-heavy mixing angle are much larger than those in the minimal
case. We study both, Dirac and Majorana, HNLs and discuss how the two cases
actually differ phenomenologically, for HNL masses above roughly 100 GeV.
| [
{
"created": "Fri, 28 May 2021 14:07:20 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Aug 2021 11:55:49 GMT",
"version": "v2"
}
] | 2022-01-17 | [
[
"Cottin",
"Giovanna",
""
],
[
"Helo",
"Juan Carlos",
""
],
[
"Hirsch",
"Martin",
""
],
[
"Titov",
"Arsenii",
""
],
[
"Wang",
"Zeren Simon",
""
]
] | Heavy neutral leptons (HNLs) with masses around the electroweak scale are expected to be rather long-lived particles, as a result of the observed smallness of the active neutrino masses. In this work, we study long-lived HNLs in $N_R$SMEFT, a Standard Model (SM) extension with singlet fermions to which we add non-renormalizable operators up to dimension-6. Operators which contain two HNLs can lead to a sizable enhancement of the production cross sections, compared to the minimal case where HNLs are produced only via their mixing with the SM neutrinos. We calculate the expected sensitivities for the ATLAS detector and the future far-detector experiments: AL3X, ANUBIS, CODEX-b, FASER, MATHUSLA, and MoEDAL-MAPP in this setup. The sensitive ranges of the HNL mass and of the active-heavy mixing angle are much larger than those in the minimal case. We study both, Dirac and Majorana, HNLs and discuss how the two cases actually differ phenomenologically, for HNL masses above roughly 100 GeV. |
hep-ph/0209340 | Iain W. Stewart | Andre H. Hoang, Iain W. Stewart | Ultrasoft Renormalization in Non-Relativistic QCD | 31 pages, 11 figs | Phys.Rev. D67 (2003) 114020 | 10.1103/PhysRevD.67.114020 | MPI-PhT/2002-49, INT-PUB-02-46 | hep-ph | null | For Non-Relativistic QCD the velocity renormalization group correlates the
renormalization scales for ultrasoft, potential and soft degrees of freedom.
Here we discuss the renormalization of operators by ultrasoft gluons. We show
that renormalization of soft vertices can induce new operators, and also
present a procedure for correctly subtracting divergences in mixed
potential-ultrasoft graphs. Our results affect the running of the
spin-independent potentials in QCD. The change for the NNLL t-tbar cross
section near threshold is very small, being at the 1% level and essentially
independent of the energy. We also discuss implications for analyzing
situations where mv^2 ~ Lambda_QCD.
| [
{
"created": "Mon, 30 Sep 2002 19:03:28 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Hoang",
"Andre H.",
""
],
[
"Stewart",
"Iain W.",
""
]
] | For Non-Relativistic QCD the velocity renormalization group correlates the renormalization scales for ultrasoft, potential and soft degrees of freedom. Here we discuss the renormalization of operators by ultrasoft gluons. We show that renormalization of soft vertices can induce new operators, and also present a procedure for correctly subtracting divergences in mixed potential-ultrasoft graphs. Our results affect the running of the spin-independent potentials in QCD. The change for the NNLL t-tbar cross section near threshold is very small, being at the 1% level and essentially independent of the energy. We also discuss implications for analyzing situations where mv^2 ~ Lambda_QCD. |
2002.02785 | Yuji Shi | Yu-Ji Shi, Wei Wang, Zhen-Xing Zhao, Ulf-G. Mei{\ss}ner | Towards a Heavy Diquark Effective Theory for Weak Decays of Doubly Heavy
Baryons | 24 pages, 3 figures, 1 table | Eur. Phys. J. C 80 (2020) 398 | 10.1140/epjc/s10052-020-7949-z | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a leading-order effective field theory for both scalar and
axial-vector heavy diquarks, and consider its power expansion in the heavy
diquark limit. By assuming the transition from QCD to diquark effective theory,
we derive the most general form for the effective diquark transition currents
based on the heavy diquark symmetry. The short-distance coefficients between
QCD and heavy diquark effective field theory are also obtained by a tree level
matching. With the effective currents in the heavy diquark limit, we perform a
reduction of the form factors for semi-leptonic decays of doubly heavy baryons,
and find that only one nonperturbative function is remaining. It is shown that
this soft function can be related to the Isgur-Wise function in heavy meson
transitions. As a phenomenological application, we take a single pole structure
for the reduced form factor, and use it to calculate the semi-leptonic decay
widths of doubly heavy baryons. The obtained results are consistent with others
given in the literature, and can be tested in the future.
| [
{
"created": "Fri, 7 Feb 2020 13:49:43 GMT",
"version": "v1"
}
] | 2020-05-15 | [
[
"Shi",
"Yu-Ji",
""
],
[
"Wang",
"Wei",
""
],
[
"Zhao",
"Zhen-Xing",
""
],
[
"Meißner",
"Ulf-G.",
""
]
] | We construct a leading-order effective field theory for both scalar and axial-vector heavy diquarks, and consider its power expansion in the heavy diquark limit. By assuming the transition from QCD to diquark effective theory, we derive the most general form for the effective diquark transition currents based on the heavy diquark symmetry. The short-distance coefficients between QCD and heavy diquark effective field theory are also obtained by a tree level matching. With the effective currents in the heavy diquark limit, we perform a reduction of the form factors for semi-leptonic decays of doubly heavy baryons, and find that only one nonperturbative function is remaining. It is shown that this soft function can be related to the Isgur-Wise function in heavy meson transitions. As a phenomenological application, we take a single pole structure for the reduced form factor, and use it to calculate the semi-leptonic decay widths of doubly heavy baryons. The obtained results are consistent with others given in the literature, and can be tested in the future. |
hep-ph/0512057 | Mikhail Braun | M.A.Braun | Conformal invariant pomeron interaction in the perurbative QCD with
large N_c | 20 pages in LaTex | Phys.Lett. B632 (2006) 297-304; Eur.Phys.J. C48 (2006) 511-522 | 10.1016/j.physletb.2005.10.054 | null | hep-ph | null | An effective non-local quantum field theory is constructed, which describes
interaction of pomerons in the high-coloured QCD. The theory includes both
splitting and merging triple pomeron vertexes and diagrams with pomeronic
loops. The Schwinger-Dyson equations for the 'physical' pomeron are written.
Conformal invariance allows to reduce the theory to the old-fashioned Gribov
pomeron theory with an infinite number of pomerons, one of which is
supercritical.
| [
{
"created": "Mon, 5 Dec 2005 07:15:27 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Braun",
"M. A.",
""
]
] | An effective non-local quantum field theory is constructed, which describes interaction of pomerons in the high-coloured QCD. The theory includes both splitting and merging triple pomeron vertexes and diagrams with pomeronic loops. The Schwinger-Dyson equations for the 'physical' pomeron are written. Conformal invariance allows to reduce the theory to the old-fashioned Gribov pomeron theory with an infinite number of pomerons, one of which is supercritical. |
hep-ph/0308194 | Elsayed Lashin Dr. | E. I. Lashin | Feynman rules for the strong and $\Delta S =1$ weak chiral Lagrangian | 22 pages | null | null | null | hep-ph | null | We present Feynman rules for the strong and $\Delta S = 1$ weak chiral
Lagrangian which are relevant for calculating $K\to \pi\pi\pi$ decay
amplitudes. Feynman rules for this specific case turn out to be too lengthy to
be included in a research paper. Since they are not standard, we decide to
include them in a separate article, making them available for any one who is
interested in this kind of calculation. Any found mistakes and (/or) comments
are warmly welcome so that corrections can be made.
| [
{
"created": "Tue, 19 Aug 2003 13:42:03 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lashin",
"E. I.",
""
]
] | We present Feynman rules for the strong and $\Delta S = 1$ weak chiral Lagrangian which are relevant for calculating $K\to \pi\pi\pi$ decay amplitudes. Feynman rules for this specific case turn out to be too lengthy to be included in a research paper. Since they are not standard, we decide to include them in a separate article, making them available for any one who is interested in this kind of calculation. Any found mistakes and (/or) comments are warmly welcome so that corrections can be made. |
1602.03344 | Ulrich Ellwanger | Ulrich Ellwanger, Cyril Hugonie | A 750 GeV Diphoton Signal from a Very Light Pseudoscalar in the NMSSM | Major update, 21 pages, scenarios with M_A ~ 210 MeV and M_A ~ 550
MeV added, references and output files from NMSSMTools added, section and
figure on Delta_eta of diphotons added. To appear in JHEP | null | null | LPT Orsay 16-07, LUPM:16-004 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The excess of events in the diphoton final state near 750 GeV observed by
ATLAS and CMS can be explained within the NMSSM near the R-symmetry limit. Both
scalars beyond the Standard Model Higgs boson have masses near 750 GeV, mix
strongly, and share sizeable production cross sections in association with
b-quarks as well as branching fractions into a pair of very light
pseudoscalars. Pseudoscalars with a mass of ~ 210 MeV decay into collimated
diphotons, whereas pseudoscalars with a mass of ~ 500-550 MeV can decay either
into collimated diphotons or into three pi^0 resulting in collimated photon
jets. Various such scenarios are discussed; the dominant constraints on the
latter scenario originate from bounds on radiative Upsilon decays, but they
allow for a signal cross section up to 6.7 fb times the acceptance for
collimated multiphotons to pass as a single photon.
| [
{
"created": "Wed, 10 Feb 2016 12:18:29 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Feb 2016 08:22:48 GMT",
"version": "v2"
},
{
"created": "Tue, 22 Mar 2016 17:28:52 GMT",
"version": "v3"
},
{
"created": "Wed, 23 Mar 2016 11:07:16 GMT",
"version": "v4"
},
{
"created": "Mon, 4 Apr 2016 11:09:45 GMT",
"version": "v5"
},
{
"created": "Tue, 17 May 2016 16:08:14 GMT",
"version": "v6"
}
] | 2016-05-18 | [
[
"Ellwanger",
"Ulrich",
""
],
[
"Hugonie",
"Cyril",
""
]
] | The excess of events in the diphoton final state near 750 GeV observed by ATLAS and CMS can be explained within the NMSSM near the R-symmetry limit. Both scalars beyond the Standard Model Higgs boson have masses near 750 GeV, mix strongly, and share sizeable production cross sections in association with b-quarks as well as branching fractions into a pair of very light pseudoscalars. Pseudoscalars with a mass of ~ 210 MeV decay into collimated diphotons, whereas pseudoscalars with a mass of ~ 500-550 MeV can decay either into collimated diphotons or into three pi^0 resulting in collimated photon jets. Various such scenarios are discussed; the dominant constraints on the latter scenario originate from bounds on radiative Upsilon decays, but they allow for a signal cross section up to 6.7 fb times the acceptance for collimated multiphotons to pass as a single photon. |
1303.3125 | Stefan Lanz | Johan Bijnens, Karol Kampf, Stefan Lanz | Leading logarithms in N-flavour mesonic Chiral Perturbation Theory | 33 pages, 8 figures, published version | Nucl.Phys.B873:137-164,2013 | 10.1016/j.nuclphysb.2013.04.012 | LU-TP 13-10 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend earlier work on leading logarithms in the massive nonlinear O(n)
sigma model to the case of SU(N)xSU(N)/SU(N) which coincides with mesonic
chiral perturbation theory for N flavours of light quarks. We discuss the
leading logarithms for the mass and decay constant to six loops and for the
vacuum expectation value <\bar{q}q> to seven loops. For dynamical quantities
the expressions grow extremely large much faster such that we only quote the
leading logarithms to five loops for the vector and scalar form factor and for
meson-meson scattering. The last quantity we consider is the vector-vector to
meson-meson amplitude where we quote results up to four loops for a subset of
quantities, in particular for the pion polarizabilities. As a side result we
provide an elementary proof that the factors of N appearing at each loop order
are odd or even depending on the order and the remaining traces over external
flavours.
| [
{
"created": "Wed, 13 Mar 2013 10:38:59 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Apr 2013 17:03:54 GMT",
"version": "v2"
}
] | 2013-05-06 | [
[
"Bijnens",
"Johan",
""
],
[
"Kampf",
"Karol",
""
],
[
"Lanz",
"Stefan",
""
]
] | We extend earlier work on leading logarithms in the massive nonlinear O(n) sigma model to the case of SU(N)xSU(N)/SU(N) which coincides with mesonic chiral perturbation theory for N flavours of light quarks. We discuss the leading logarithms for the mass and decay constant to six loops and for the vacuum expectation value <\bar{q}q> to seven loops. For dynamical quantities the expressions grow extremely large much faster such that we only quote the leading logarithms to five loops for the vector and scalar form factor and for meson-meson scattering. The last quantity we consider is the vector-vector to meson-meson amplitude where we quote results up to four loops for a subset of quantities, in particular for the pion polarizabilities. As a side result we provide an elementary proof that the factors of N appearing at each loop order are odd or even depending on the order and the remaining traces over external flavours. |
2312.08425 | Benjamin Safdi | Joshua N. Benabou, Quentin Bonnefoy, Malte Buschmann, Soubhik Kumar,
Benjamin R. Safdi | The Cosmological Dynamics of String Theory Axion Strings | 36 pages, 6 figures, video abstract at https://youtu.be/LnN9W9Vkxt4 | null | null | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quantum chromodynamics (QCD) axion may solve the strong CP problem and
explain the dark matter (DM) abundance of our Universe. The axion was
originally proposed to arise as the pseudo-Nambu Goldstone boson of global
$\mathrm{U}(1)_{\rm PQ}$ Peccei-Quinn (PQ) symmetry breaking, but axions also
arise generically in string theory as zero modes of higher-dimensional gauge
fields. In this work we show that string theory axions behave fundamentally
differently from field theory axions in the early Universe. Field theory axions
may form axion strings if the PQ phase transition takes place after inflation.
In contrast, we show that string theory axions do not generically form axion
strings. In special inflationary paradigms, such as D-brane inflation, string
theory axion strings may form; however, their tension is parametrically larger
than that of field theory axion strings. We then show that such QCD axion
strings overproduce the DM abundance for all allowed QCD axion masses and are
thus ruled out, except in scenarios with large warping. A loop-hole to this
conclusion arises in the axiverse, where an axion string could be composed of
multiple different axion mass eigenstates; a heavier eigenstate could collapse
the network earlier, allowing for the QCD axion to produce the correct DM
abundance and also generating observable gravitational wave signals.
| [
{
"created": "Wed, 13 Dec 2023 19:00:00 GMT",
"version": "v1"
}
] | 2023-12-15 | [
[
"Benabou",
"Joshua N.",
""
],
[
"Bonnefoy",
"Quentin",
""
],
[
"Buschmann",
"Malte",
""
],
[
"Kumar",
"Soubhik",
""
],
[
"Safdi",
"Benjamin R.",
""
]
] | The quantum chromodynamics (QCD) axion may solve the strong CP problem and explain the dark matter (DM) abundance of our Universe. The axion was originally proposed to arise as the pseudo-Nambu Goldstone boson of global $\mathrm{U}(1)_{\rm PQ}$ Peccei-Quinn (PQ) symmetry breaking, but axions also arise generically in string theory as zero modes of higher-dimensional gauge fields. In this work we show that string theory axions behave fundamentally differently from field theory axions in the early Universe. Field theory axions may form axion strings if the PQ phase transition takes place after inflation. In contrast, we show that string theory axions do not generically form axion strings. In special inflationary paradigms, such as D-brane inflation, string theory axion strings may form; however, their tension is parametrically larger than that of field theory axion strings. We then show that such QCD axion strings overproduce the DM abundance for all allowed QCD axion masses and are thus ruled out, except in scenarios with large warping. A loop-hole to this conclusion arises in the axiverse, where an axion string could be composed of multiple different axion mass eigenstates; a heavier eigenstate could collapse the network earlier, allowing for the QCD axion to produce the correct DM abundance and also generating observable gravitational wave signals. |
1204.0303 | Tomohiro Matsuda | Tomohiro Matsuda | Free light fields can change the predictions of hybrid inflation | In conclusions and discussions added a short comment about
non-trivial waterfall | null | 10.1088/1475-7516/2012/04/020 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the free light scalar fields that may exist in the inflationary
Universe can change the predictions of the hybrid inflation model. Possible
signatures are discussed, which can be used to discriminate the sources of the
spectrum.
| [
{
"created": "Mon, 2 Apr 2012 03:07:51 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Apr 2012 09:55:12 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Matsuda",
"Tomohiro",
""
]
] | We show that the free light scalar fields that may exist in the inflationary Universe can change the predictions of the hybrid inflation model. Possible signatures are discussed, which can be used to discriminate the sources of the spectrum. |
hep-ph/0510357 | V.N. Rodionov | V.N. Rodionov and A.M. Mandel and E.V. Arbuzova | On Influence of Intensive Stationary Electromagnetic Field on the
Behavior of Fermionic Systems | 15 pages, no figures, LaTeX2e | null | 10.1142/9789812772657_0068 | null | hep-ph hep-th | null | Exact solutions of Schroedinger and Pauli equations for charged particles in
an external stationary electromagnetic field of an arbitrary configuration are
constructed. Green functions of scalar and spinor particles are calculated in
this field. The corresponding equations for complex energy of particles bounded
by short range potential are deduced. Boundary condition typical for delta -
potential is not used in the treatment. Explicit analytical expressions are
given for the shift and width of a quasistationary level for different
configurations of the external field. The critical value of electric field in
which the idea of quasistationary level becomes meaningless is calculated. It
is shown that the common view on the stabilizing role of magnetic field
concerns only scalar particles.
| [
{
"created": "Thu, 27 Oct 2005 11:15:03 GMT",
"version": "v1"
}
] | 2016-12-07 | [
[
"Rodionov",
"V. N.",
""
],
[
"Mandel",
"A. M.",
""
],
[
"Arbuzova",
"E. V.",
""
]
] | Exact solutions of Schroedinger and Pauli equations for charged particles in an external stationary electromagnetic field of an arbitrary configuration are constructed. Green functions of scalar and spinor particles are calculated in this field. The corresponding equations for complex energy of particles bounded by short range potential are deduced. Boundary condition typical for delta - potential is not used in the treatment. Explicit analytical expressions are given for the shift and width of a quasistationary level for different configurations of the external field. The critical value of electric field in which the idea of quasistationary level becomes meaningless is calculated. It is shown that the common view on the stabilizing role of magnetic field concerns only scalar particles. |
1605.03902 | Kai Ma | Kai Ma, Jian-Hua Wang, Huan-Xiong Yang | Probing the noncommutative effects of phase space in the time-dependent
Aharonov-Bohm effect | 12pages. arXiv admin note: substantial text overlap with
arXiv:1604.02110 | null | 10.1016/j.aop.2017.05.005 | null | hep-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the noncommutative corrections on the time-dependent Aharonov-Bohm
effect when both the coordinate-coordinate and momentum-momentum
noncommutativities are considered. This study is motivated by the recent
observation that there is no net phase shift in the time-dependent AB effect on
the ordinary space, and therefore tiny derivation from zero can indicate new
physics. The vanishing of the time-dependent AB phase shift on the ordinary
space is preserved by the gauge and Lorentz symmetries. However, on the
noncomutative phase space, while the ordinary gauge symmetry can be kept by the
Seiberg-Witten map, but the Lorentz symmetry is broken. Therefore nontrivial
noncommutative corrections are expected. We find there are three kinds of
noncommutative corrections in general: 1) $\xi$-dependent correction which
comes from the noncommutativity among momentum operators; 2) momentum-dependent
correction which is rooted in the nonlocal interactions in the noncommutative
extended model; 3) momentum-independent correction which emerges become of the
gauge invariant condition on the nonlocal interactions in the noncommutative
model. We proposed two dimensionless quantities, which are based on the
distributions of the measured phase shift with respect to the external magnetic
field and to the cross section enclosed by the particle trajectory, to extract
the noncommutative parameters. We find that stronger (weaker) magnetic field
strength can give better bounds on the coordinate-coordinate
(momentum-momentum) noncommutative parameter, and large parameter space region
can be explored by the time-dependent AB effect.
| [
{
"created": "Thu, 12 May 2016 17:24:16 GMT",
"version": "v1"
}
] | 2017-06-28 | [
[
"Ma",
"Kai",
""
],
[
"Wang",
"Jian-Hua",
""
],
[
"Yang",
"Huan-Xiong",
""
]
] | We study the noncommutative corrections on the time-dependent Aharonov-Bohm effect when both the coordinate-coordinate and momentum-momentum noncommutativities are considered. This study is motivated by the recent observation that there is no net phase shift in the time-dependent AB effect on the ordinary space, and therefore tiny derivation from zero can indicate new physics. The vanishing of the time-dependent AB phase shift on the ordinary space is preserved by the gauge and Lorentz symmetries. However, on the noncomutative phase space, while the ordinary gauge symmetry can be kept by the Seiberg-Witten map, but the Lorentz symmetry is broken. Therefore nontrivial noncommutative corrections are expected. We find there are three kinds of noncommutative corrections in general: 1) $\xi$-dependent correction which comes from the noncommutativity among momentum operators; 2) momentum-dependent correction which is rooted in the nonlocal interactions in the noncommutative extended model; 3) momentum-independent correction which emerges become of the gauge invariant condition on the nonlocal interactions in the noncommutative model. We proposed two dimensionless quantities, which are based on the distributions of the measured phase shift with respect to the external magnetic field and to the cross section enclosed by the particle trajectory, to extract the noncommutative parameters. We find that stronger (weaker) magnetic field strength can give better bounds on the coordinate-coordinate (momentum-momentum) noncommutative parameter, and large parameter space region can be explored by the time-dependent AB effect. |
1809.10709 | Jonathan Ouellet | J. L. Ouellet, Z. Bogorad | Solutions to Axion Electrodynamics in Various Geometries | 10 pages, 4 figures | Phys. Rev. D 99, 055010 (2019) | 10.1103/PhysRevD.99.055010 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently there has been a surge of new experimental proposals to search for
ultra-light axion dark matter with axion mass, $m_a\lesssim1\,\mu$eV. Many of
these proposals search for small oscillating magnetic fields induced in or
around a large static magnetic field. Lately, there has been interest in
alternate detection schemes which search for oscillating electric fields in a
similar setup. In this paper, we explicitly solve Maxwell's equations in a
simplified geometry and demonstrate that in this mass range, the axion induced
electric fields are heavily suppressed by boundary conditions. Unfortunately,
experimentally measuring axion induced electric fields is not feasible in this
mass regime using the currently proposed setups with static primary fields. We
show that at larger axion masses, induced electric fields are not suppressed,
but boundary effects may still be relevant for an experiment's sensitivity. We
then make a general argument about a generic detector configuration with a
static magnetic field to show that the electric fields are always suppressed in
the limit of large wavelength.
| [
{
"created": "Thu, 27 Sep 2018 18:18:06 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Mar 2019 07:40:56 GMT",
"version": "v2"
}
] | 2019-03-14 | [
[
"Ouellet",
"J. L.",
""
],
[
"Bogorad",
"Z.",
""
]
] | Recently there has been a surge of new experimental proposals to search for ultra-light axion dark matter with axion mass, $m_a\lesssim1\,\mu$eV. Many of these proposals search for small oscillating magnetic fields induced in or around a large static magnetic field. Lately, there has been interest in alternate detection schemes which search for oscillating electric fields in a similar setup. In this paper, we explicitly solve Maxwell's equations in a simplified geometry and demonstrate that in this mass range, the axion induced electric fields are heavily suppressed by boundary conditions. Unfortunately, experimentally measuring axion induced electric fields is not feasible in this mass regime using the currently proposed setups with static primary fields. We show that at larger axion masses, induced electric fields are not suppressed, but boundary effects may still be relevant for an experiment's sensitivity. We then make a general argument about a generic detector configuration with a static magnetic field to show that the electric fields are always suppressed in the limit of large wavelength. |
2407.16806 | Mukesh Kumar | Karabo Mosala, Anza-Tshilidzi Mulaudzi, Thuso Mathaha, Pramod Sharma,
Mukesh Kumar, Bruce Mellado, Manqi Ruan | The Observation of a 95 GeV Scalar at Future Electron-Positron Colliders | Figure 3 and 4 are inconsistent and a new version needs time to
update | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Large Electron Positron collider observed an indication for a new Higgs
boson with a mass around $95$ GeV-$100$ GeV in 2003. The interest in this
excess re-emerged with di-photon ($\approx$95 GeV), $WW$ and $\tau\tau$
signatures obtained by the Large Hadron Collider, leading to a combined global
significance of $3.8\sigma$. We perform a feasibility study for discovering
such a new scalar at future electron-positron colliders using the recoil-mass
method applied to $e^{+} e^{-} \to ZS$ with $Z \rightarrow \mu^{+} \mu^{-}$ and
$S \to b \bar{b}$. We employ a Deep Neural Network to enhance the separation
between the Standard Model background and the signal, reducing the required
integrated luminosity for a discovery by a factor of two to three. As a result,
a $SU(2)_L$ singlet Higgs can be observed at a 250 GeV centre-of-mass energy
collider and $5~{\rm ab}^{-1}$ integrated luminosity if it has a mixing angle
of at least $0.2$ with the Standard Model Higgs. This further strengthens the
physics case for future $e^+e^-$ accelerators, like CEPC, CLIC, FCC-ee and ILC.
| [
{
"created": "Tue, 23 Jul 2024 19:17:37 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jul 2024 19:29:27 GMT",
"version": "v2"
}
] | 2024-07-29 | [
[
"Mosala",
"Karabo",
""
],
[
"Mulaudzi",
"Anza-Tshilidzi",
""
],
[
"Mathaha",
"Thuso",
""
],
[
"Sharma",
"Pramod",
""
],
[
"Kumar",
"Mukesh",
""
],
[
"Mellado",
"Bruce",
""
],
[
"Ruan",
"Manqi",
""
]
] | The Large Electron Positron collider observed an indication for a new Higgs boson with a mass around $95$ GeV-$100$ GeV in 2003. The interest in this excess re-emerged with di-photon ($\approx$95 GeV), $WW$ and $\tau\tau$ signatures obtained by the Large Hadron Collider, leading to a combined global significance of $3.8\sigma$. We perform a feasibility study for discovering such a new scalar at future electron-positron colliders using the recoil-mass method applied to $e^{+} e^{-} \to ZS$ with $Z \rightarrow \mu^{+} \mu^{-}$ and $S \to b \bar{b}$. We employ a Deep Neural Network to enhance the separation between the Standard Model background and the signal, reducing the required integrated luminosity for a discovery by a factor of two to three. As a result, a $SU(2)_L$ singlet Higgs can be observed at a 250 GeV centre-of-mass energy collider and $5~{\rm ab}^{-1}$ integrated luminosity if it has a mixing angle of at least $0.2$ with the Standard Model Higgs. This further strengthens the physics case for future $e^+e^-$ accelerators, like CEPC, CLIC, FCC-ee and ILC. |
2202.03522 | Andrew Akeroyd | A.G. Akeroyd, Stefano Moretti, Muyuan Song | Slight excess at 130 GeV in search for a charged Higgs boson decaying to
a charm quark and a bottom quark at the Large Hadron Collider | 30 pages, 11 figures | null | 10.1088/1361-6471/ac77a6 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Searches for a charged Higgs boson ($H^\pm$) decaying to a charm quark and a
bottom quark ($H^\pm \to cb$) have been carried out at the Large Hadron
Collider (LHC) in the decay of top quarks ($t\to H^\pm b$). In a recent search
by the ATLAS collaboration (with all Run II data, 139 fb$^{-1}$) a local excess
of around $3\sigma$ has been observed, which is best fitted by a charged Higgs
boson with a mass ($m_{H^\pm}$) of around 130 GeV and a product of branching
ratios (BRs) given by BR$(t\to H^\pm b)\times{\rm BR}(H^\pm\to cb)=0.16\%\pm
0.06\%$. In the context of Two-Higgs-Doublet Models (2HDM) with independent
Yukawa couplings for $H^\pm$ we present the parameter space for which this
excess (assuming it to be genuine) can be accommodated, taking into account the
limits from LHC searches for $H^\pm\to cs$ and $H^\pm\to \tau\nu$ at
$m_{H^\pm}$=130 GeV and the constraint from $b\to s\gamma$. It is then shown
that such an excess cannot be explained in 2HDMs with natural flavour
conservation, but can be accommodated in the flipped Three-Higgs-Doublet Model
(3HDM) and in the aligned 2HDM (A2HDM). Upcoming searches with 139 fb$^{-1}$ in
the channels $H^\pm\to cb$ (CMS), $H^\pm \to cs$ (ATLAS/CMS) and $H^\pm \to
\tau\nu$ (ATLAS/CMS) will determine if the excess is the first sign of an
$H^\pm$ with $m_{H^\pm}=130$ GeV.
| [
{
"created": "Mon, 7 Feb 2022 21:17:20 GMT",
"version": "v1"
}
] | 2022-07-13 | [
[
"Akeroyd",
"A. G.",
""
],
[
"Moretti",
"Stefano",
""
],
[
"Song",
"Muyuan",
""
]
] | Searches for a charged Higgs boson ($H^\pm$) decaying to a charm quark and a bottom quark ($H^\pm \to cb$) have been carried out at the Large Hadron Collider (LHC) in the decay of top quarks ($t\to H^\pm b$). In a recent search by the ATLAS collaboration (with all Run II data, 139 fb$^{-1}$) a local excess of around $3\sigma$ has been observed, which is best fitted by a charged Higgs boson with a mass ($m_{H^\pm}$) of around 130 GeV and a product of branching ratios (BRs) given by BR$(t\to H^\pm b)\times{\rm BR}(H^\pm\to cb)=0.16\%\pm 0.06\%$. In the context of Two-Higgs-Doublet Models (2HDM) with independent Yukawa couplings for $H^\pm$ we present the parameter space for which this excess (assuming it to be genuine) can be accommodated, taking into account the limits from LHC searches for $H^\pm\to cs$ and $H^\pm\to \tau\nu$ at $m_{H^\pm}$=130 GeV and the constraint from $b\to s\gamma$. It is then shown that such an excess cannot be explained in 2HDMs with natural flavour conservation, but can be accommodated in the flipped Three-Higgs-Doublet Model (3HDM) and in the aligned 2HDM (A2HDM). Upcoming searches with 139 fb$^{-1}$ in the channels $H^\pm\to cb$ (CMS), $H^\pm \to cs$ (ATLAS/CMS) and $H^\pm \to \tau\nu$ (ATLAS/CMS) will determine if the excess is the first sign of an $H^\pm$ with $m_{H^\pm}=130$ GeV. |
hep-ph/9803441 | Chun Wa Wong | Chun Wa Wong | Color mixing in high-energy hadron collisions | 3 journal-style pages | Phys.Rev. D58 (1998) 037501 | 10.1103/PhysRevD.58.037501 | UCLA-NT-9801 | hep-ph | null | The color mixing of mesons propagating in a nucleus is studied with the help
of a color-octet Pomeron partner present in the two-gluon model of the Pomeron.
For a simple model with four meson-nucleon channels, color mixings are found to
be absent for pointlike mesons and very small for small mesons. These results
seem to validate the absorption model with two independent color components
used in recent analyses of the nuclear absorption of $J/\psi$ mesons produced
in nuclear reactions.
| [
{
"created": "Wed, 25 Mar 1998 03:51:22 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Wong",
"Chun Wa",
""
]
] | The color mixing of mesons propagating in a nucleus is studied with the help of a color-octet Pomeron partner present in the two-gluon model of the Pomeron. For a simple model with four meson-nucleon channels, color mixings are found to be absent for pointlike mesons and very small for small mesons. These results seem to validate the absorption model with two independent color components used in recent analyses of the nuclear absorption of $J/\psi$ mesons produced in nuclear reactions. |
2308.14829 | Sebastian Grieninger | Sebastian Grieninger, Sergio Morales-Tejera | Real-time dynamics of axial charge and chiral magnetic current in a
non-Abelian expanding plasma | 14+2 pages, 6+4 figures; v2: matches version published in PRD; added
references; title change to conform with APS conventions; | Phys. Rev. D 108, 126010 (2023) | 10.1103/PhysRevD.108.126010 | IFT-UAM/CSIC-23-109 | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Understanding axial charge dynamics driven by changes in Chern-Simons number
densities is a key aspect in understanding the chiral magnetic effect (CME) in
heavy-ion collisions. Most phenomenological simulations assume that a large
amount of axial charge is produced in the initial stages and that axial charge
is conserved throughout the simulation. Within an (expanding) homogeneous
holographic plasma, we investigate the real-time axial charge relaxation
dynamics and their impact on the chiral magnetic current. Moreover, we discuss
the real-time interplay of the non-Abelian and the Abelian chiral anomaly in
the presence of a strong magnetic field. In the expanding plasma, the
Chern-Simons diffusion rate and thus the axial charge relaxation rate are time
dependent due to the decaying magnetic field. We quantify the changes in the
late time falloffs and establish a horizon formula for the chiral magnetic
current.
| [
{
"created": "Mon, 28 Aug 2023 18:29:32 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Dec 2023 18:53:16 GMT",
"version": "v2"
}
] | 2023-12-19 | [
[
"Grieninger",
"Sebastian",
""
],
[
"Morales-Tejera",
"Sergio",
""
]
] | Understanding axial charge dynamics driven by changes in Chern-Simons number densities is a key aspect in understanding the chiral magnetic effect (CME) in heavy-ion collisions. Most phenomenological simulations assume that a large amount of axial charge is produced in the initial stages and that axial charge is conserved throughout the simulation. Within an (expanding) homogeneous holographic plasma, we investigate the real-time axial charge relaxation dynamics and their impact on the chiral magnetic current. Moreover, we discuss the real-time interplay of the non-Abelian and the Abelian chiral anomaly in the presence of a strong magnetic field. In the expanding plasma, the Chern-Simons diffusion rate and thus the axial charge relaxation rate are time dependent due to the decaying magnetic field. We quantify the changes in the late time falloffs and establish a horizon formula for the chiral magnetic current. |
hep-ph/0305312 | Thomas Schwetz | M. Maltoni, T. Schwetz, M.A. Tortola and J.W.F. Valle | Can four neutrinos explain global oscillation data including LSND and
cosmology? | Talk given by T.S. at the NOON 2003 workshop, February 10-14, 2003,
Kanazawa, Japan, 10 pages, 5 figures | null | null | TUM-HEP-513/03 | hep-ph | null | We present an analysis of the global neutrino oscillation data in terms of
four-neutrino mass schemes. We find that the strong preference of oscillations
into active neutrinos implied by solar+KamLAND as well as atmospheric neutrino
data allows to rule out (2+2) mass schemes, whereas (3+1) schemes are strongly
disfavoured by short-baseline experiments. In addition, we perform an analysis
using recent data from cosmology, including CMB data from WMAP and data from
2dFGRS large scale structure surveys. These data lead to further restrictions
of the allowed regions for the (3+1) mass scheme.
| [
{
"created": "Wed, 28 May 2003 18:57:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Maltoni",
"M.",
""
],
[
"Schwetz",
"T.",
""
],
[
"Tortola",
"M. A.",
""
],
[
"Valle",
"J. W. F.",
""
]
] | We present an analysis of the global neutrino oscillation data in terms of four-neutrino mass schemes. We find that the strong preference of oscillations into active neutrinos implied by solar+KamLAND as well as atmospheric neutrino data allows to rule out (2+2) mass schemes, whereas (3+1) schemes are strongly disfavoured by short-baseline experiments. In addition, we perform an analysis using recent data from cosmology, including CMB data from WMAP and data from 2dFGRS large scale structure surveys. These data lead to further restrictions of the allowed regions for the (3+1) mass scheme. |
hep-ph/9603258 | Tran Tuan Anh | Hoang Ngoc Long | Right Handed Neutrino Currents in the SU(3)_LxU(1)_N Electroweak Theory | 13 pages, latex, no figures, Presented at the 2nd Recontres du
Vietnam - Physics at the Frontiers of the Standard Model, Ho Chi Minh City,
Vietnam, 21-28 October 1995 | null | null | VITP 95-04 | hep-ph | null | A version of the $\mbox{SU(3)}_L\otimes \mbox{U(1)}_N$ electroweak theory in
which there are right-handed neutrino currents is reconsidered in detail. We
argue that in order to have a result consistent with low-energy one, the
right-handed neutrino component must be treated as correction instead of an
equivalent spin state. The data from the $Z$-decay allow us to fix the limit
for $\phi$ as $-0.00285 \leq \phi \leq 0.00018$. From the neutrino neutral
current scattering, we estimate a bound for the new neutral gauge boson $Z^2$
mass in the range of 400 GeV. A bound for the new charged and neutral
(non-Hermitian) gauge bosons $Y^{\pm}, X^o$ is also obtained from
symmetry-breaking hierarchy.
| [
{
"created": "Sat, 9 Mar 1996 14:52:18 GMT",
"version": "v1"
}
] | 2023-01-30 | [
[
"Long",
"Hoang Ngoc",
""
]
] | A version of the $\mbox{SU(3)}_L\otimes \mbox{U(1)}_N$ electroweak theory in which there are right-handed neutrino currents is reconsidered in detail. We argue that in order to have a result consistent with low-energy one, the right-handed neutrino component must be treated as correction instead of an equivalent spin state. The data from the $Z$-decay allow us to fix the limit for $\phi$ as $-0.00285 \leq \phi \leq 0.00018$. From the neutrino neutral current scattering, we estimate a bound for the new neutral gauge boson $Z^2$ mass in the range of 400 GeV. A bound for the new charged and neutral (non-Hermitian) gauge bosons $Y^{\pm}, X^o$ is also obtained from symmetry-breaking hierarchy. |
1211.3535 | Keisuke Harigaya | Keisuke Harigaya, Masahiro Ibe, Masahiro Kawasaki and Tsutomu T.
Yanagida | Non-Gaussianity from Attractor Curvaton | 19 pages, 1 figure | null | 10.1103/PhysRevD.87.063514 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a curvaton model in which the initial condition of the curvaton
oscillation is determined by its attractor behavior during inflation. Assuming
a chaotic inflation model, we find that the initial condition determined by the
attractor behavior is appropriate to generate a sizable non-Gaussianity
contribution to the curvature perturbation, which will be tested in the
foreseeable future. Implications on the thermal history of the universe and on
particle physics models are also discussed.
| [
{
"created": "Thu, 15 Nov 2012 09:13:25 GMT",
"version": "v1"
}
] | 2013-03-27 | [
[
"Harigaya",
"Keisuke",
""
],
[
"Ibe",
"Masahiro",
""
],
[
"Kawasaki",
"Masahiro",
""
],
[
"Yanagida",
"Tsutomu T.",
""
]
] | We propose a curvaton model in which the initial condition of the curvaton oscillation is determined by its attractor behavior during inflation. Assuming a chaotic inflation model, we find that the initial condition determined by the attractor behavior is appropriate to generate a sizable non-Gaussianity contribution to the curvature perturbation, which will be tested in the foreseeable future. Implications on the thermal history of the universe and on particle physics models are also discussed. |
1101.3296 | Roberto Trotta | F. Feroz (Cambridge), K. Cranmer (NYU), M. Hobson (Cambridge), R. Ruiz
de Austri (Valencia), R. Trotta (Imperial) | Challenges of Profile Likelihood Evaluation in Multi-Dimensional SUSY
Scans | 21 pages, 9 figures, 1 table; minor changes following referee report.
Matches version accepted by JHEP | JHEP 1106:042,2011 | 10.1007/JHEP06(2011)042 | null | hep-ph physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Statistical inference of the fundamental parameters of supersymmetric
theories is a challenging and active endeavor. Several sophisticated algorithms
have been employed to this end. While Markov-Chain Monte Carlo (MCMC) and
nested sampling techniques are geared towards Bayesian inference, they have
also been used to estimate frequentist confidence intervals based on the
profile likelihood ratio. We investigate the performance and appropriate
configuration of MultiNest, a nested sampling based algorithm, when used for
profile likelihood-based analyses both on toy models and on the parameter space
of the Constrained MSSM. We find that while the standard configuration is
appropriate for an accurate reconstruction of the Bayesian posterior, the
profile likelihood is poorly approximated. We identify a more appropriate
MultiNest configuration for profile likelihood analyses, which gives an
excellent exploration of the profile likelihood (albeit at a larger
computational cost), including the identification of the global maximum
likelihood value. We conclude that with the appropriate configuration MultiNest
is a suitable tool for profile likelihood studies, indicating previous claims
to the contrary are not well founded.
| [
{
"created": "Mon, 17 Jan 2011 19:46:14 GMT",
"version": "v1"
},
{
"created": "Wed, 25 May 2011 06:08:49 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Feroz",
"F.",
"",
"Cambridge"
],
[
"Cranmer",
"K.",
"",
"NYU"
],
[
"Hobson",
"M.",
"",
"Cambridge"
],
[
"de Austri",
"R. Ruiz",
"",
"Valencia"
],
[
"Trotta",
"R.",
"",
"Imperial"
]
] | Statistical inference of the fundamental parameters of supersymmetric theories is a challenging and active endeavor. Several sophisticated algorithms have been employed to this end. While Markov-Chain Monte Carlo (MCMC) and nested sampling techniques are geared towards Bayesian inference, they have also been used to estimate frequentist confidence intervals based on the profile likelihood ratio. We investigate the performance and appropriate configuration of MultiNest, a nested sampling based algorithm, when used for profile likelihood-based analyses both on toy models and on the parameter space of the Constrained MSSM. We find that while the standard configuration is appropriate for an accurate reconstruction of the Bayesian posterior, the profile likelihood is poorly approximated. We identify a more appropriate MultiNest configuration for profile likelihood analyses, which gives an excellent exploration of the profile likelihood (albeit at a larger computational cost), including the identification of the global maximum likelihood value. We conclude that with the appropriate configuration MultiNest is a suitable tool for profile likelihood studies, indicating previous claims to the contrary are not well founded. |
1103.1590 | Claudio Coriano | Roberta Armillis, Claudio Coriano, Luigi Delle Rose, A.R. Fazio | Comments on Anomaly Cancellations by Pole Subtractions and Ghost
Instabilities with Gravity | 18 pages. Revised version. To appear in "Classical and Quantum
Gravity" | Class.Quant.Grav.28:145004,2011 | 10.1088/0264-9381/28/14/145004 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate some aspects of anomaly cancellation realized by the
subtraction of an anomaly pole, stressing on some of its properties in
superspace. In a local formulation these subtractions can be described in terms
of a physical scalar, an axion and related ghosts. They appear to be necessary
for the unitarization of the theory in the ultraviolet, but they may generate
an infrared instability of the corresponding effective action, signalled by
ghost condensation. In particular the subtraction of the superanomaly multiplet
by a pole in superspace is of dubious significance, due to the different nature
of the chiral and conformal anomalies. In turn, this may set more stringent
constraints on the coupling of supersymmetric theories to gravity.
| [
{
"created": "Tue, 8 Mar 2011 18:17:41 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Mar 2011 10:00:25 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Apr 2011 19:35:55 GMT",
"version": "v3"
},
{
"created": "Sun, 1 May 2011 21:16:31 GMT",
"version": "v4"
}
] | 2011-06-07 | [
[
"Armillis",
"Roberta",
""
],
[
"Coriano",
"Claudio",
""
],
[
"Rose",
"Luigi Delle",
""
],
[
"Fazio",
"A. R.",
""
]
] | We investigate some aspects of anomaly cancellation realized by the subtraction of an anomaly pole, stressing on some of its properties in superspace. In a local formulation these subtractions can be described in terms of a physical scalar, an axion and related ghosts. They appear to be necessary for the unitarization of the theory in the ultraviolet, but they may generate an infrared instability of the corresponding effective action, signalled by ghost condensation. In particular the subtraction of the superanomaly multiplet by a pole in superspace is of dubious significance, due to the different nature of the chiral and conformal anomalies. In turn, this may set more stringent constraints on the coupling of supersymmetric theories to gravity. |
hep-ph/0308109 | Tetsuo Shindou | Takahiro Miura, Tetsuo Shindou and Eiichi Takasugi | The renormalization group effect to the bi-maximal mixing | revtex4, 15 pages, 2 figures | Phys.Rev. D68 (2003) 093009 | 10.1103/PhysRevD.68.093009 | OU-HET 454 | hep-ph | null | We discuss whether the bi-maximal mixing given at GUT is consistent with the
solar mixing at the normal side at the low energy. We consider the radiative
corrections due to the tau-Yukawa, the neutrino-Yukawa and the slepton
threshold corrections and discuss in what situation the maximal solar angle
rotates towards the normal side. In this scheme, the |V_{13}| and the Dirac CP
phase delta are induced radiatively and we estimate these values.
| [
{
"created": "Mon, 11 Aug 2003 01:34:55 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Sep 2003 04:02:46 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Miura",
"Takahiro",
""
],
[
"Shindou",
"Tetsuo",
""
],
[
"Takasugi",
"Eiichi",
""
]
] | We discuss whether the bi-maximal mixing given at GUT is consistent with the solar mixing at the normal side at the low energy. We consider the radiative corrections due to the tau-Yukawa, the neutrino-Yukawa and the slepton threshold corrections and discuss in what situation the maximal solar angle rotates towards the normal side. In this scheme, the |V_{13}| and the Dirac CP phase delta are induced radiatively and we estimate these values. |
0711.2204 | Alexandre Kisselev | A.V. Kisselev | RS model with the small curvature and Bhabha scattering at the ILC | 13 pages, 5 figures, talk at the International School-Seminar
``Actual Problems of Microworld Physics'', Gomel, Belarus, July 23 - August
3, 2007 | null | null | null | hep-ph | null | The Randall-Sundrum (RS) model with the small curvature is studied. In such a
scheme the mass spectrum of Kaluza-Klein (KK) gravitons is similar to that in a
model with one extra flat dimension. The gravity effects in the Bhabha
scattering at the energy 1 TeV are estimated. The calculations are based on the
analytical formula which describes virtual graviton contributions. It takes
into account both a discrete character of the mass spectrum and nonzero widths
of the KK gravitons.
| [
{
"created": "Wed, 14 Nov 2007 14:08:04 GMT",
"version": "v1"
}
] | 2007-11-15 | [
[
"Kisselev",
"A. V.",
""
]
] | The Randall-Sundrum (RS) model with the small curvature is studied. In such a scheme the mass spectrum of Kaluza-Klein (KK) gravitons is similar to that in a model with one extra flat dimension. The gravity effects in the Bhabha scattering at the energy 1 TeV are estimated. The calculations are based on the analytical formula which describes virtual graviton contributions. It takes into account both a discrete character of the mass spectrum and nonzero widths of the KK gravitons. |
1102.4732 | P\'eter Kov\'acs Dr. | P. Kovacs and G. Wolf and F. Giacosa and D. Parganlija | Zero temperature properties of mesons in a vector meson extended linear
sigma model | 4 pages, 0 figures, submitted to the Hot and Cold Baryonic Matter
(HCBM 2010) conference proceedings | null | 10.1051/epjconf/20111302006 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A three flavor linear sigma model with vector and axial-vector mesons is
discussed. Preliminary results concerning on the symmetry breaking pattern, the
question of parameterization, as well as the resulting meson masses are
presented.
| [
{
"created": "Wed, 23 Feb 2011 13:12:29 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Kovacs",
"P.",
""
],
[
"Wolf",
"G.",
""
],
[
"Giacosa",
"F.",
""
],
[
"Parganlija",
"D.",
""
]
] | A three flavor linear sigma model with vector and axial-vector mesons is discussed. Preliminary results concerning on the symmetry breaking pattern, the question of parameterization, as well as the resulting meson masses are presented. |
hep-ph/0503011 | Valery Maiorov | V.N. Maiorov and O.O. Patarakin | S-wave pi-pi phase shifts and scattering lengths. The model-independent
analysis | 15 pages, 7 postscript figures, LaTeX | null | null | IAE-6342/2 | hep-ph | null | The model-independent analysis of the S- and P-wave pi-pi phase shifts was
carried out. This analysis was based on the using of the Roy equations only and
all available experimental data from the threshold up to dipion mass 1GeV. The
S-wave lengths obtained obviously confirm the standard ChPT version. Moreover,
additional arguments were found in favor of the ratio of the S-wave phase
shifts being independent of energy from the threshold up to 900MeV.
| [
{
"created": "Tue, 1 Mar 2005 15:08:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Maiorov",
"V. N.",
""
],
[
"Patarakin",
"O. O.",
""
]
] | The model-independent analysis of the S- and P-wave pi-pi phase shifts was carried out. This analysis was based on the using of the Roy equations only and all available experimental data from the threshold up to dipion mass 1GeV. The S-wave lengths obtained obviously confirm the standard ChPT version. Moreover, additional arguments were found in favor of the ratio of the S-wave phase shifts being independent of energy from the threshold up to 900MeV. |
hep-ph/9305223 | JoAnne Hewett | J.L. Hewett and T.G. Rizzo | Using $b \to s\gamma$ to Probe Top Quark Couplings | 10 pages plus 6 figures (available by request), LaTex,
ANL-HEP-PR-93-37 | Phys.Rev. D49 (1994) 319-322 | 10.1103/PhysRevD.49.319 | null | hep-ph | null | Possible anomalous couplings of the top-quark to on-shell photons and gluons
are constrained by the recent results of the CLEO Collaboration on both
inclusive and exclusive radiative $B$ decays. We find that the process \bsg\
can lead to reasonable bounds on both the anomalous electric and magnetic
dipole moments of the top-quark, while essentially no limits are obtained on
the corresponding chromoelectric and chromomagnetic moments, which enter the
expression for the decay rate only through operator mixing.
| [
{
"created": "Fri, 7 May 1993 02:24:16 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Hewett",
"J. L.",
""
],
[
"Rizzo",
"T. G.",
""
]
] | Possible anomalous couplings of the top-quark to on-shell photons and gluons are constrained by the recent results of the CLEO Collaboration on both inclusive and exclusive radiative $B$ decays. We find that the process \bsg\ can lead to reasonable bounds on both the anomalous electric and magnetic dipole moments of the top-quark, while essentially no limits are obtained on the corresponding chromoelectric and chromomagnetic moments, which enter the expression for the decay rate only through operator mixing. |
hep-ph/0205296 | Kapogiannis Athanasios | A.S. Kapoyannis, C.N. Ktorides and A.D. Panagiotou (University of
Athens) | A global assessment of the Strangeness including-Statistical Bootstrap
Model analysis of nucleus-nucleus and proton-antiproton interactions | revised version | J.Phys. G28 (2002) L47 | 10.1088/0954-3899/28/1/304 | UA/NPPS-3-2002 | hep-ph | null | A strangeness and isospin asymmetry including statistical bootstrap model
analysis of the multiparticle system produced in the Pb+Pb collision at 158
AGeV at CERN is presented. It is concluded that this interaction process has
not crossed the deconfinenent line. Direct comparisons with the results of
similar analyses pertaining to nucleus-nucleus and proton-antiproton collisions
at CERN are made. The overall picture points to the S+S collision at 200 AGeV
as a prime candidate of a process which has crossed the border separating the
hadronic from the deconfined phase of matter.
| [
{
"created": "Sun, 26 May 2002 22:35:17 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Aug 2002 09:58:01 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Kapoyannis",
"A. S.",
"",
"University of\n Athens"
],
[
"Ktorides",
"C. N.",
"",
"University of\n Athens"
],
[
"Panagiotou",
"A. D.",
"",
"University of\n Athens"
]
] | A strangeness and isospin asymmetry including statistical bootstrap model analysis of the multiparticle system produced in the Pb+Pb collision at 158 AGeV at CERN is presented. It is concluded that this interaction process has not crossed the deconfinenent line. Direct comparisons with the results of similar analyses pertaining to nucleus-nucleus and proton-antiproton collisions at CERN are made. The overall picture points to the S+S collision at 200 AGeV as a prime candidate of a process which has crossed the border separating the hadronic from the deconfined phase of matter. |
0806.0764 | Guillaume Beuf | Guillaume Beuf | Universality of QCD traveling-waves with running coupling beyond leading
logarithmic accuracy | 4 pages. To appear in the proceedings of the School on QCD, Low-x
Physics and Diffraction, Copanello, Calabria, Italy, July 2007 | Acta Phys.Polon.B39:2557-2560,2008 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the solutions of QCD evolution equations with saturation in the
high energy limit. We present a general argument showing that, in the running
coupling case, the Next-to-Leading-Logarithmic (NLL) and higher order terms are
irrelevant for the universal asymptotic features of the solutions.
| [
{
"created": "Wed, 4 Jun 2008 12:54:50 GMT",
"version": "v1"
}
] | 2008-12-19 | [
[
"Beuf",
"Guillaume",
""
]
] | We discuss the solutions of QCD evolution equations with saturation in the high energy limit. We present a general argument showing that, in the running coupling case, the Next-to-Leading-Logarithmic (NLL) and higher order terms are irrelevant for the universal asymptotic features of the solutions. |
1102.4706 | Rupa Chatterjee | Rupa Chatterjee, Hannu Holopainen, Thorsten Renk, and Kari J. Eskola | Enhancement of thermal photon production in event-by-event hydrodynamics | 5 pages, 3 figures. Discussion expanded, published version in PRC | Phys.Rev.C83:054908,2011 | 10.1103/PhysRevC.83.054908 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Thermal photon emission is widely believed to reflect properties of the
earliest, hottest evolution stage of the medium created in ultra-relativistic
heavy-ion collisions. Previous computations of photon emission have been
carried out using a hydrodynamical medium description with smooth, averaged
initial conditions. Recently, more sophisticated hydrodynamical models which
calculate observables by averaging over many evolutions with event-by-event
fluctuating initial conditions (IC) have been developed. Given their direct
connection to the early time dynamics, thermal photon emission appears an ideal
observable to probe fluctuations in the medium initial state. In this work, we
demonstrate that including fluctuations in the IC may lead to an enhancement of
the thermal photon yield of about a factor of 2 in the region $2 < p_T < 4$
GeV/$c$ (where thermal photon production dominates the direct photon yield)
compared to a scenario using smooth, averaged IC. Consequently, a much better
agreement with PHENIX data is found. This can be understood in terms of the
strong temperature dependence of thermal photon production, translating into a
sensitivity to the presence of 'hotspots' in an event and thus establishing
thermal photons as a suitable probe to characterize IC fluctuations.
| [
{
"created": "Wed, 23 Feb 2011 10:05:23 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Jun 2011 13:24:31 GMT",
"version": "v2"
}
] | 2011-06-21 | [
[
"Chatterjee",
"Rupa",
""
],
[
"Holopainen",
"Hannu",
""
],
[
"Renk",
"Thorsten",
""
],
[
"Eskola",
"Kari J.",
""
]
] | Thermal photon emission is widely believed to reflect properties of the earliest, hottest evolution stage of the medium created in ultra-relativistic heavy-ion collisions. Previous computations of photon emission have been carried out using a hydrodynamical medium description with smooth, averaged initial conditions. Recently, more sophisticated hydrodynamical models which calculate observables by averaging over many evolutions with event-by-event fluctuating initial conditions (IC) have been developed. Given their direct connection to the early time dynamics, thermal photon emission appears an ideal observable to probe fluctuations in the medium initial state. In this work, we demonstrate that including fluctuations in the IC may lead to an enhancement of the thermal photon yield of about a factor of 2 in the region $2 < p_T < 4$ GeV/$c$ (where thermal photon production dominates the direct photon yield) compared to a scenario using smooth, averaged IC. Consequently, a much better agreement with PHENIX data is found. This can be understood in terms of the strong temperature dependence of thermal photon production, translating into a sensitivity to the presence of 'hotspots' in an event and thus establishing thermal photons as a suitable probe to characterize IC fluctuations. |
hep-ph/9904273 | Zhu Shou-hua | Chong Sheng Li (PKU), Xinmin Zhang (IHEP), Shou Hua Zhu (ITP) | SUSY-QCD Effect on Top-Charm Associated Production at Linear Collider | version to appear in PRD | Phys.Rev.D60:077702,1999 | 10.1103/PhysRevD.60.077702 | null | hep-ph | null | We evaluate the contribution of SUSY-QCD to top-charm associated production
at next generation linear colliders. Our results show that the production cross
section of the process $e^+e^-\to t\bar c{or}\bar t c$ could be as large as 0.1
fb, which is larger than the prediction of the SM by a factor of $10^8$.
| [
{
"created": "Thu, 8 Apr 1999 10:00:24 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Jul 1999 05:53:27 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Li",
"Chong Sheng",
"",
"PKU"
],
[
"Zhang",
"Xinmin",
"",
"IHEP"
],
[
"Zhu",
"Shou Hua",
"",
"ITP"
]
] | We evaluate the contribution of SUSY-QCD to top-charm associated production at next generation linear colliders. Our results show that the production cross section of the process $e^+e^-\to t\bar c{or}\bar t c$ could be as large as 0.1 fb, which is larger than the prediction of the SM by a factor of $10^8$. |
1305.6935 | Pavel Fileviez Perez | Pavel Fileviez Perez (MPIK) | On the Origin of R-parity Violation in Supersymmetry | Plenary talk given at 20th International Conference on Supersymmetry
and Unification of Fundamental Interactions (SUSY2012); version published in
IJMPA | Int. J. Mod. Phys. A 28 (2013) 1330024 | 10.1142/S0217751X1330024X | null | hep-ph hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The fate of R-parity in supersymmetric theories is discussed in detail. We
make a strong case for R-parity violation showing that the simplest theories
based on the local B-L symmetry predict the spontaneous breaking of R-parity at
the SUSY scale. The possible implications for the searches at the Large Hadron
Collider are discussed.
| [
{
"created": "Wed, 29 May 2013 20:00:31 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Jun 2013 12:42:05 GMT",
"version": "v2"
}
] | 2013-06-28 | [
[
"Perez",
"Pavel Fileviez",
"",
"MPIK"
]
] | The fate of R-parity in supersymmetric theories is discussed in detail. We make a strong case for R-parity violation showing that the simplest theories based on the local B-L symmetry predict the spontaneous breaking of R-parity at the SUSY scale. The possible implications for the searches at the Large Hadron Collider are discussed. |
0801.4028 | Frank Tackmann | Christian W. Bauer, Frank J. Tackmann, Jesse Thaler | GenEvA (II): A phase space generator from a reweighted parton shower | 54 pages, 20 figures, v2: corrected typos, added references | JHEP0812:011,2008 | 10.1088/1126-6708/2008/12/011 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a new efficient algorithm for phase space generation. A parton
shower is used to distribute events across all of multiplicity, flavor, and
phase space, and these events can then be reweighted to any desired analytic
distribution. To verify this method, we reproduce the e+e- -> n jets tree-level
result of traditional matrix element tools. We also show how to improve
tree-level matrix elements automatically with leading-logarithmic resummation.
This algorithm is particularly useful in the context of a new framework for
event generation called GenEvA. In a companion paper [arXiv:0801.4026], we show
how the GenEvA framework can address contemporary issues in event generation.
| [
{
"created": "Mon, 28 Jan 2008 20:07:11 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Sep 2008 22:31:14 GMT",
"version": "v2"
}
] | 2008-12-18 | [
[
"Bauer",
"Christian W.",
""
],
[
"Tackmann",
"Frank J.",
""
],
[
"Thaler",
"Jesse",
""
]
] | We introduce a new efficient algorithm for phase space generation. A parton shower is used to distribute events across all of multiplicity, flavor, and phase space, and these events can then be reweighted to any desired analytic distribution. To verify this method, we reproduce the e+e- -> n jets tree-level result of traditional matrix element tools. We also show how to improve tree-level matrix elements automatically with leading-logarithmic resummation. This algorithm is particularly useful in the context of a new framework for event generation called GenEvA. In a companion paper [arXiv:0801.4026], we show how the GenEvA framework can address contemporary issues in event generation. |
hep-ph/0505018 | Robert Fleischer | Robert Fleischer (CERN) | New Physics in B and K Decays | 44 pages, 10 figures, invited lectures given at the Lake Louise
Winter Institute "Fundamental Interactions", Chateau Lake Louise, Alberta,
Canada, 20-26 February 2005 | null | 10.1142/9789812774422_0001 | CERN-PH-TH/2005-078 | hep-ph | null | Flavour physics offers interesting probes for the exploration of the Standard
Model and the search for new physics. In these lectures, we focus on B- and
K-meson decays, introduce the concept of low-energy effective Hamiltonians to
describe them theoretically, and discuss how physics beyond the Standard Model
may generically affect the roadmap of quark-flavour physics. We address then
both the implications of the B-factory data for the B_d -> J/psi K_S channel
and the prospects of B_s -> J/psi phi modes for hadron colliders, and discuss
how the Standard Model may be challenged through B_d -> phi K_S. Finally, as an
example of a systematic flavour strategy to search for new physics, we analyze
puzzling patterns in the B -> pi pi, pi K data and study their interplay with
rare K and B decays.
| [
{
"created": "Tue, 3 May 2005 14:45:06 GMT",
"version": "v1"
}
] | 2016-11-09 | [
[
"Fleischer",
"Robert",
"",
"CERN"
]
] | Flavour physics offers interesting probes for the exploration of the Standard Model and the search for new physics. In these lectures, we focus on B- and K-meson decays, introduce the concept of low-energy effective Hamiltonians to describe them theoretically, and discuss how physics beyond the Standard Model may generically affect the roadmap of quark-flavour physics. We address then both the implications of the B-factory data for the B_d -> J/psi K_S channel and the prospects of B_s -> J/psi phi modes for hadron colliders, and discuss how the Standard Model may be challenged through B_d -> phi K_S. Finally, as an example of a systematic flavour strategy to search for new physics, we analyze puzzling patterns in the B -> pi pi, pi K data and study their interplay with rare K and B decays. |
2212.10161 | Mikhail Ivanov | Mikhail A. Ivanov, Zhomart Tyulemissov, Akmaral Tyulemissova | Weak nonleptonic decays of vector B-mesons | 24 pages, 7 figures, 10 tables. Some discussion and reference added.
To appear in Phys.Rev.D | null | 10.1103/PhysRevD.107.013009 | null | hep-ph | http://creativecommons.org/publicdomain/zero/1.0/ | We study the radiative and weak nonleptonic decays of vector B-mesons within
the covariant confined quark model (CCQM) developed in our previous papers.
First, we calculate the matrix elements and decays widths of the radiative
decays $B^\ast\to B\gamma$. The obtained results are compared with those
obtained in other approaches. Then we consider the nonleptonic decays
$B^\ast\to D^\ast V$ which proceed via tree-level quark diagrams. It is shown
that the analytical expressions for the amplitudes correspond to the
factorization approach. In the framework of our model we calculate the leptonic
decay constants and the form factors of the $B^\ast\to D^\ast(V)$ transitions
in the entire physical region of the momentum transfer squared. Finally, we
calculate the two-body decay widths and compare our results with other models.
| [
{
"created": "Tue, 20 Dec 2022 10:57:39 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Jan 2023 13:49:31 GMT",
"version": "v2"
}
] | 2023-02-08 | [
[
"Ivanov",
"Mikhail A.",
""
],
[
"Tyulemissov",
"Zhomart",
""
],
[
"Tyulemissova",
"Akmaral",
""
]
] | We study the radiative and weak nonleptonic decays of vector B-mesons within the covariant confined quark model (CCQM) developed in our previous papers. First, we calculate the matrix elements and decays widths of the radiative decays $B^\ast\to B\gamma$. The obtained results are compared with those obtained in other approaches. Then we consider the nonleptonic decays $B^\ast\to D^\ast V$ which proceed via tree-level quark diagrams. It is shown that the analytical expressions for the amplitudes correspond to the factorization approach. In the framework of our model we calculate the leptonic decay constants and the form factors of the $B^\ast\to D^\ast(V)$ transitions in the entire physical region of the momentum transfer squared. Finally, we calculate the two-body decay widths and compare our results with other models. |
hep-ph/0412135 | Alejandro Ayala | Alejandro Ayala (ICN-UNAM), Angel S\'anchez (ICN-UNAM), Gabriella
Piccinelli (CTA-UNAM), Sarira Sahu (ICN-UNAM) | Effective potential at finite temperature in a constant magnetic field
I: Ring diagrams in a scalar theory | Expanded comments, 4 figures added. Conclusions unchanged. Version to
match published paper | Phys.Rev. D71 (2005) 023004 | 10.1103/PhysRevD.71.023004 | null | hep-ph astro-ph | null | We study symmetry restoration at finite temperature in the theory of a
charged scalar field interacting with a constant, external magnetic field. We
compute the finite temperature effective potential including the contribution
from ring diagrams. We show that in the weak field case, the presence of the
field produces a stronger first order phase transition and that the temperature
for the onset of the transition is lower, as compared to the case without
magnetic field.
| [
{
"created": "Thu, 9 Dec 2004 19:33:42 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Feb 2005 00:15:46 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Ayala",
"Alejandro",
"",
"ICN-UNAM"
],
[
"Sánchez",
"Angel",
"",
"ICN-UNAM"
],
[
"Piccinelli",
"Gabriella",
"",
"CTA-UNAM"
],
[
"Sahu",
"Sarira",
"",
"ICN-UNAM"
]
] | We study symmetry restoration at finite temperature in the theory of a charged scalar field interacting with a constant, external magnetic field. We compute the finite temperature effective potential including the contribution from ring diagrams. We show that in the weak field case, the presence of the field produces a stronger first order phase transition and that the temperature for the onset of the transition is lower, as compared to the case without magnetic field. |
2306.09428 | Simone Biondini | Simone Biondini, Talal Ahmed Chowdhury and Shaikh Saad | Non-perturbative effects for dark sectors with QCD portals | 47 pages, 12 figures | null | 10.1007/JHEP08(2023)002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we consider a class of dark matter (DM) models where the DM
does not directly interact with the Standard Model (SM) particles at the
tree-level. Therefore, the coannihilation mechanism is crucial in achieving the
correct DM relic abundance, which in turn requires the coannihilating partner
to be close in mass to the actual DM particle. In our systematisation of the
models' class, the mediator and the coannihilation partner are assumed to be
charged under QCD interactions. This last feature calls for a scrutiny of
non-perturbative effects, namely Sommerfeld factors and bound-state formation,
on the annihilations of the colored partner. Such non-perturbative effects are
illustrated with an example model comprising a scalar leptoquark mediator, a
Dirac vector-like fermion coannihilation partner, and a singlet DM fermion.
Phenomenological features of this model, namely DM direct and indirect
detection prospects, collider implications, and impact on the muon anomalous
magnetic moment, are discussed.
| [
{
"created": "Thu, 15 Jun 2023 18:21:11 GMT",
"version": "v1"
}
] | 2023-08-16 | [
[
"Biondini",
"Simone",
""
],
[
"Chowdhury",
"Talal Ahmed",
""
],
[
"Saad",
"Shaikh",
""
]
] | In this work, we consider a class of dark matter (DM) models where the DM does not directly interact with the Standard Model (SM) particles at the tree-level. Therefore, the coannihilation mechanism is crucial in achieving the correct DM relic abundance, which in turn requires the coannihilating partner to be close in mass to the actual DM particle. In our systematisation of the models' class, the mediator and the coannihilation partner are assumed to be charged under QCD interactions. This last feature calls for a scrutiny of non-perturbative effects, namely Sommerfeld factors and bound-state formation, on the annihilations of the colored partner. Such non-perturbative effects are illustrated with an example model comprising a scalar leptoquark mediator, a Dirac vector-like fermion coannihilation partner, and a singlet DM fermion. Phenomenological features of this model, namely DM direct and indirect detection prospects, collider implications, and impact on the muon anomalous magnetic moment, are discussed. |
hep-ph/0412017 | Andrew Blechman | Andrew E. Blechman | Shining on an Orbifold | 17 pages; updated references and acknowledgements; endnote added to
the end of Appendix A | Phys.Rev. D71 (2005) 085013 | 10.1103/PhysRevD.71.085013 | null | hep-ph hep-th | null | By shining a hypermultiplet from one side of the bulk of a flat
five-dimensional orbifold, supersymmetry can be broken by boundary conditions.
The extra dimension is stabilized in a supersymmetric way, and by computing the
four-dimensional effective potential for the radion it is shown that
supersymmetry breaking does not damage our radius stabilization mechanism. The
low energy theory contains the radion and two complex scalars that are massless
in the global supersymmetric limit and are stabilized by tree level
supergravity effects. It is shown that radion mediation can play the dominant
role in communicating supersymmetry breaking to the visible sector. It is also
shown that at tree level, contact terms are exponentially suppressed.
| [
{
"created": "Wed, 1 Dec 2004 21:34:14 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Jan 2005 18:33:00 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Blechman",
"Andrew E.",
""
]
] | By shining a hypermultiplet from one side of the bulk of a flat five-dimensional orbifold, supersymmetry can be broken by boundary conditions. The extra dimension is stabilized in a supersymmetric way, and by computing the four-dimensional effective potential for the radion it is shown that supersymmetry breaking does not damage our radius stabilization mechanism. The low energy theory contains the radion and two complex scalars that are massless in the global supersymmetric limit and are stabilized by tree level supergravity effects. It is shown that radion mediation can play the dominant role in communicating supersymmetry breaking to the visible sector. It is also shown that at tree level, contact terms are exponentially suppressed. |
2405.15867 | Margot MacMahon | Joachim Kopp, Pedro Machado, Margot MacMahon and Ivan Martinez-Soler | Improving Neutrino Energy Reconstruction with Machine Learning | 6 pages, 8 figures | null | null | CERN-TH-2024-066, MITP-24-052, FERMILAB-PUB-24-0276-T, IPPP/24/26 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Faithful energy reconstruction is foundational for precision neutrino
experiments like DUNE, but is hindered by uncertainties in our understanding of
neutrino--nucleus interactions. Here, we demonstrate that dense neural networks
are very effective in overcoming these uncertainties by estimating inaccessible
kinematic variables based on the observable part of the final state. We find
improvements in the energy resolution by up to a factor of two compared to
conventional reconstruction algorithms, which translates into an improved
physics performance equivalent to a 10-30% increase in the exposure.
| [
{
"created": "Fri, 24 May 2024 18:24:09 GMT",
"version": "v1"
}
] | 2024-05-28 | [
[
"Kopp",
"Joachim",
""
],
[
"Machado",
"Pedro",
""
],
[
"MacMahon",
"Margot",
""
],
[
"Martinez-Soler",
"Ivan",
""
]
] | Faithful energy reconstruction is foundational for precision neutrino experiments like DUNE, but is hindered by uncertainties in our understanding of neutrino--nucleus interactions. Here, we demonstrate that dense neural networks are very effective in overcoming these uncertainties by estimating inaccessible kinematic variables based on the observable part of the final state. We find improvements in the energy resolution by up to a factor of two compared to conventional reconstruction algorithms, which translates into an improved physics performance equivalent to a 10-30% increase in the exposure. |
hep-ph/9810466 | Anatoly Radyushkin | A.V. Radyushkin | Symmetries and structure of skewed and double distributions | 10 pages, Latex, 3 figures | Phys.Lett.B449:81-88,1999 | 10.1016/S0370-2693(98)01584-6 | JLAB-THY-98-41 | hep-ph | null | Extending the concept of parton densities onto nonforward matrix elements
<p'|O(0,z)|p> of quark and gluon light-cone operators, one can use two types of
nonperturbative functions: double distributions (DDs) f(x,\alpha;t), F(x,y;t)
and skewed (off&nonforward) parton distributions (SPDs) H(x,\xi;t),
F_\zeta(X,t). We treat DDs as primary objects producing SPDs after integration.
We emphasize the role of DDs in understanding interplay between X (x) and \zeta
(\xi) dependences of SPDs.In particular, the use of DDs is crucial to secure
the polynomiality condition: Nth moments of SPDs are Nth degree polynomials in
the relevant skewedness parameter \zeta or \xi. We propose simple ansaetze for
DDs having correct spectral and symmetry properties and derive model
expressions for SPDs satisfying all known constraints. Finally, we argue that
for small skewedness, one can obtain SPDs from the usual parton densities by
averaging the latter with an appropriate weight over the region [X-\zeta,X] (or
[x - \xi, x + \xi]).
| [
{
"created": "Fri, 23 Oct 1998 19:29:57 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Oct 1998 20:59:43 GMT",
"version": "v2"
},
{
"created": "Wed, 4 Nov 1998 20:14:26 GMT",
"version": "v3"
}
] | 2009-07-09 | [
[
"Radyushkin",
"A. V.",
""
]
] | Extending the concept of parton densities onto nonforward matrix elements <p'|O(0,z)|p> of quark and gluon light-cone operators, one can use two types of nonperturbative functions: double distributions (DDs) f(x,\alpha;t), F(x,y;t) and skewed (off&nonforward) parton distributions (SPDs) H(x,\xi;t), F_\zeta(X,t). We treat DDs as primary objects producing SPDs after integration. We emphasize the role of DDs in understanding interplay between X (x) and \zeta (\xi) dependences of SPDs.In particular, the use of DDs is crucial to secure the polynomiality condition: Nth moments of SPDs are Nth degree polynomials in the relevant skewedness parameter \zeta or \xi. We propose simple ansaetze for DDs having correct spectral and symmetry properties and derive model expressions for SPDs satisfying all known constraints. Finally, we argue that for small skewedness, one can obtain SPDs from the usual parton densities by averaging the latter with an appropriate weight over the region [X-\zeta,X] (or [x - \xi, x + \xi]). |
2003.09886 | Hao Sun | Tichouk, Hao Sun, Xuan Luo | Hard diffractive $\rm \eta_{c,b}$ hadroproduction at the LHC | 8figures, 13 pages | Phys. Rev. D 101, 054035 (2020) | 10.1103/PhysRevD.101.054035 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the inclusive diffractive hadroproduction for
$\rm \eta_{c}$ and $\rm \eta_{b}$ at the LHC energies. Based on the NRQCD
factorization formalism and the resolved-Pomeron model for the quarkonium
production mechanism, we estimate the rapidity, momentum fraction loss
dependence of the cross section. We give prediction ratios for single and
central diffractive processes with respect to non diffractive process. These
inclusive processes are sensitive to gluon content of Pomeron for small-$x$ and
Reggeon for large-$x$, useful to study small and large-$x$ physics and good to
test different mechanism for $\rm \eta_{c}$ and $\rm \eta_{b}$ production at
the LHC. They also serve as the background to related exclusive processes thus
should be predicted. Our results demonstrate that the Reggeon contribution of
diffractive processes can be sizable, even sometimes dominant over Pomeron, and
that its study can be useful to better constrain the Reggeon parton content.
The experimental study of Reggeon can be carried out in certain kinematic
windows.
| [
{
"created": "Sun, 22 Mar 2020 13:24:06 GMT",
"version": "v1"
}
] | 2020-04-01 | [
[
"Tichouk",
"",
""
],
[
"Sun",
"Hao",
""
],
[
"Luo",
"Xuan",
""
]
] | In this paper, we investigate the inclusive diffractive hadroproduction for $\rm \eta_{c}$ and $\rm \eta_{b}$ at the LHC energies. Based on the NRQCD factorization formalism and the resolved-Pomeron model for the quarkonium production mechanism, we estimate the rapidity, momentum fraction loss dependence of the cross section. We give prediction ratios for single and central diffractive processes with respect to non diffractive process. These inclusive processes are sensitive to gluon content of Pomeron for small-$x$ and Reggeon for large-$x$, useful to study small and large-$x$ physics and good to test different mechanism for $\rm \eta_{c}$ and $\rm \eta_{b}$ production at the LHC. They also serve as the background to related exclusive processes thus should be predicted. Our results demonstrate that the Reggeon contribution of diffractive processes can be sizable, even sometimes dominant over Pomeron, and that its study can be useful to better constrain the Reggeon parton content. The experimental study of Reggeon can be carried out in certain kinematic windows. |
hep-ph/0102126 | Brian Harris | B. W. Harris, E. Laenen, L. Phaf, Z. Sullivan, and S. Weinzierl | Fully differential QCD corrections to single top quark final states | 3 pages, 3 figures, talk presented at DPF2000, August 9-12, 2000. To
appear in International Journal of Modern Physics A | Int.J.Mod.Phys.A16S1A:379-381,2001 | 10.1142/S0217751X0100698X | ANL-HEP-CP-00-094 | hep-ph | null | A new next-to-leading order Monte Carlo program for calculation of fully
differential single top quark final states is described and first results
presented. Both the s- and t-channel contributions are included.
| [
{
"created": "Sat, 10 Feb 2001 21:47:08 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Harris",
"B. W.",
""
],
[
"Laenen",
"E.",
""
],
[
"Phaf",
"L.",
""
],
[
"Sullivan",
"Z.",
""
],
[
"Weinzierl",
"S.",
""
]
] | A new next-to-leading order Monte Carlo program for calculation of fully differential single top quark final states is described and first results presented. Both the s- and t-channel contributions are included. |
2308.14072 | Xiang Liu | Ri-Qing Qian and Xiang Liu | Production of charmonium $\chi_{cJ}(2P)$ plus one $\omega$ meson by
$e^+e^-$ annihilation | 7 pages and 6 figures. Accepted by Phys. Rev. D for publication | Phys. Rev. D 108, 094046 (2023) | 10.1103/PhysRevD.108.094046 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by the recent observation of $e^+e^-\to \omega X(3872)$ by the
BESIII Collaboration, in this work we study the production of the charmonium
$\chi_{cJ}(2P)$ by $e^+e^-$ annihilation. We find that the
$e^+e^-\to\omega\chi_{c0}(2P)$ and $e^+e^-\to \omega\chi_{c2}(2P)$ have sizable
production rates, when taking the cross section data from $e^+e^-\to \omega
X(3872)$ as the scaling point and treating the $X(3872)$ as the charmonium
$\chi_{c1}(2P)$. Considering that the dominant decay modes of $\chi_{c0}$ and
$\chi_{c2}(2P)$ involve $D\bar{D}$ final states, we propose that $e^+e^-\to
\omega D\bar{D}$ is an ideal process to identify $\chi_{c0}(2P)$ and
$\chi_{c2}(2P)$, which is similar to the situation that happens in the
$D\bar{D}$ invariant mass spectrum of the $\gamma\gamma\to D\bar{D}$ and
$B^+\to D^+{D}^- K^+$ processes. With continuous accumulation of experimental
data, these proposed production processes offer a promising avenue for
exploration by the BESIII and Belle II collaborations.
| [
{
"created": "Sun, 27 Aug 2023 11:08:18 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Nov 2023 01:57:26 GMT",
"version": "v2"
}
] | 2023-12-01 | [
[
"Qian",
"Ri-Qing",
""
],
[
"Liu",
"Xiang",
""
]
] | Inspired by the recent observation of $e^+e^-\to \omega X(3872)$ by the BESIII Collaboration, in this work we study the production of the charmonium $\chi_{cJ}(2P)$ by $e^+e^-$ annihilation. We find that the $e^+e^-\to\omega\chi_{c0}(2P)$ and $e^+e^-\to \omega\chi_{c2}(2P)$ have sizable production rates, when taking the cross section data from $e^+e^-\to \omega X(3872)$ as the scaling point and treating the $X(3872)$ as the charmonium $\chi_{c1}(2P)$. Considering that the dominant decay modes of $\chi_{c0}$ and $\chi_{c2}(2P)$ involve $D\bar{D}$ final states, we propose that $e^+e^-\to \omega D\bar{D}$ is an ideal process to identify $\chi_{c0}(2P)$ and $\chi_{c2}(2P)$, which is similar to the situation that happens in the $D\bar{D}$ invariant mass spectrum of the $\gamma\gamma\to D\bar{D}$ and $B^+\to D^+{D}^- K^+$ processes. With continuous accumulation of experimental data, these proposed production processes offer a promising avenue for exploration by the BESIII and Belle II collaborations. |
hep-ph/0306158 | Andreas Weiler | Andrzej J. Buras, Anton Poschenrieder, Michael Spranger, Andreas
Weiler | The Impact of Universal Extra Dimensions on B -> X_s gamma, B -> X_s
gluon, B -> X_s mu^+ mu^-, K_L -> pi^0 e^ +e^-, and epsilon'/epsilon | Main latex-file, 8 figures, 41 pages | Nucl.Phys.B678:455-490,2004 | 10.1016/j.nuclphysb.2003.11.010 | TUM-HEP-512/03, MPI-PhT/2003-26 | hep-ph | null | We calculate the contributions of the Kaluza-Klein (KK) modes to the
gamma-penguins, gluon-penguins, gamma-magnetic penguins and chromomagnetic
penguins in the Appelquist, Cheng and Dobrescu (ACD) model with one universal
extra dimension. Together with our previous calculation of Z^0 penguin diagrams
(See http://arxiv.org/abs/hep-ph/0212143) this allows to study the impact of
the KK modes on the decays B -> X_s gamma, B -> X_s gluon, B -> X_s mu^+ mu^-
and K_L -> pi^0 e^+ e^- and on the CP-violating ratio epsilon'/epsilon. For the
compactification scale 1/R= 300 GeV the perturbative part of the branching
ratio for B -> X_s mu^+ mu^- is enhanced by 12 % while the zero in the A_FB
asymmetry is shifted from \hat s_0=0.162 to \hat s_0=0.142. The sizable
suppressions of Br(B -> X_s gamma) ~ 20 % and Br(B -> X_s gluon) ~ 40 % could
have interesting phenomenological implications on the lower bound on 1/R
provided the experimental and theoretical uncertainties will be decreased.
Similar comments apply to epsilon'/epsilon that is suppressed relative to the
Standard Model expectations with the size of the suppression depending
sensitively on the hadronic matrix elements. The impact on K_L -> pi^0 e^+ e^-
is below 10 %. We point out a correlation between the zero \hat s_0 in the A_FB
asymmetry and Br(B -> X_s gamma) that should be valid in most models with
minimal flavour violation.
| [
{
"created": "Wed, 18 Jun 2003 09:27:28 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Buras",
"Andrzej J.",
""
],
[
"Poschenrieder",
"Anton",
""
],
[
"Spranger",
"Michael",
""
],
[
"Weiler",
"Andreas",
""
]
] | We calculate the contributions of the Kaluza-Klein (KK) modes to the gamma-penguins, gluon-penguins, gamma-magnetic penguins and chromomagnetic penguins in the Appelquist, Cheng and Dobrescu (ACD) model with one universal extra dimension. Together with our previous calculation of Z^0 penguin diagrams (See http://arxiv.org/abs/hep-ph/0212143) this allows to study the impact of the KK modes on the decays B -> X_s gamma, B -> X_s gluon, B -> X_s mu^+ mu^- and K_L -> pi^0 e^+ e^- and on the CP-violating ratio epsilon'/epsilon. For the compactification scale 1/R= 300 GeV the perturbative part of the branching ratio for B -> X_s mu^+ mu^- is enhanced by 12 % while the zero in the A_FB asymmetry is shifted from \hat s_0=0.162 to \hat s_0=0.142. The sizable suppressions of Br(B -> X_s gamma) ~ 20 % and Br(B -> X_s gluon) ~ 40 % could have interesting phenomenological implications on the lower bound on 1/R provided the experimental and theoretical uncertainties will be decreased. Similar comments apply to epsilon'/epsilon that is suppressed relative to the Standard Model expectations with the size of the suppression depending sensitively on the hadronic matrix elements. The impact on K_L -> pi^0 e^+ e^- is below 10 %. We point out a correlation between the zero \hat s_0 in the A_FB asymmetry and Br(B -> X_s gamma) that should be valid in most models with minimal flavour violation. |
1504.04921 | Pankaj Jain | A. C. Nayak, R. K. Verma and P. Jain | Effect of VSR invariant Chern-Simon Lagrangian on photon polarization | 5 pages, 1 figure | null | 10.1088/1475-7516/2015/07/031 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a generalization of the Chern-Simon (CS) Lagrangian which is
invariant under the SIM(2) transformations but not under the full Lorentz
group. We study the effect of such a term on radiation propagating over
cosmological distances. We find that the dominant effect of this term is to
produce circular polarization as radiation propagates through space. We use the
circular polarization data from distant radio sources in order to impose a
limit on this term.
| [
{
"created": "Mon, 20 Apr 2015 02:35:23 GMT",
"version": "v1"
}
] | 2015-08-06 | [
[
"Nayak",
"A. C.",
""
],
[
"Verma",
"R. K.",
""
],
[
"Jain",
"P.",
""
]
] | We propose a generalization of the Chern-Simon (CS) Lagrangian which is invariant under the SIM(2) transformations but not under the full Lorentz group. We study the effect of such a term on radiation propagating over cosmological distances. We find that the dominant effect of this term is to produce circular polarization as radiation propagates through space. We use the circular polarization data from distant radio sources in order to impose a limit on this term. |
hep-ph/9609364 | Antal Jakovac | A. Jakovac and A. Patkos | Partial Path Integration of Quantum Fields: Two-Loop Analysis of the
SU(2) Gauge-Higgs Model at Finite Temperature | LaTeX, 45 pages | Nucl.Phys. B494 (1997) 54-88 | 10.1016/S0550-3213(97)00159-4 | null | hep-ph | null | High temperature reduction of the SU(2) Higgs model is realised by partially
integrating its partition function. Various approximate forms of the effective
theory resulting from the integration over nonstatic fields and the static
electric potential are analysed. Also non-polynomial and non-local terms are
allowed. Consistency of the perturbative solution is ensured by new types of
induced counterterms. Perturbative phase transition characteristics are
presented in the Higgs mass range 30-120 GeV, and compared to results of other
perturbative approaches.
| [
{
"created": "Mon, 16 Sep 1996 13:03:35 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Jakovac",
"A.",
""
],
[
"Patkos",
"A.",
""
]
] | High temperature reduction of the SU(2) Higgs model is realised by partially integrating its partition function. Various approximate forms of the effective theory resulting from the integration over nonstatic fields and the static electric potential are analysed. Also non-polynomial and non-local terms are allowed. Consistency of the perturbative solution is ensured by new types of induced counterterms. Perturbative phase transition characteristics are presented in the Higgs mass range 30-120 GeV, and compared to results of other perturbative approaches. |
hep-ph/0201294 | Carlo Ewerz | Hans Guenter Dosch, Carlo Ewerz, Volker Schatz | The Odderon in High Energy Elastic pp Scattering | 21 pages, 10 figures, v2: minor modifications, reference added,
results unchanged | Eur.Phys.J.C24:561-571,2002 | 10.1007/s10052-002-0961-7 | HD-THEP-01-45 | hep-ph | null | We study the Odderon contribution to elastic pp and ppbar scattering at high
energies. Different models for the Odderon-proton coupling are considered and
their effects on the differential cross section in the dip region are
investigated. We use a Regge fit by Donnachie and Landshoff as a framework and
replace its Odderon contribution by the different models. We consider two
models for the Odderon-proton impact factor proposed by Fukugita and Kwiecinski
and by Levin and Ryskin. In addition we construct a geometric model of the
proton which allows us to put limits on the size of a possible diquark cluster
in the proton. All models are able to describe the data well. The two models
for the impact factor require the strong coupling constant to be fixed rather
precisely. In the geometric model a relatively small diquark size is required
to describe the data.
| [
{
"created": "Wed, 30 Jan 2002 18:01:41 GMT",
"version": "v1"
},
{
"created": "Mon, 20 May 2002 16:47:27 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Dosch",
"Hans Guenter",
""
],
[
"Ewerz",
"Carlo",
""
],
[
"Schatz",
"Volker",
""
]
] | We study the Odderon contribution to elastic pp and ppbar scattering at high energies. Different models for the Odderon-proton coupling are considered and their effects on the differential cross section in the dip region are investigated. We use a Regge fit by Donnachie and Landshoff as a framework and replace its Odderon contribution by the different models. We consider two models for the Odderon-proton impact factor proposed by Fukugita and Kwiecinski and by Levin and Ryskin. In addition we construct a geometric model of the proton which allows us to put limits on the size of a possible diquark cluster in the proton. All models are able to describe the data well. The two models for the impact factor require the strong coupling constant to be fixed rather precisely. In the geometric model a relatively small diquark size is required to describe the data. |
2104.04526 | Azad Inshalla oglu Ahmadov | A.I. Ahmadov, K.H. Abasova, M.Sh. Orucova | Bound State Solution Schr\"{o}dinger Equation for Extended Cornell
Potential at Finite Temperature | 25 pages, 6 figures, 5 tables | null | null | null | hep-ph hep-th math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the finite temperature-dependent Schr\"{o}dinger
equation by using the Nikiforov-Uvarov method. We consider the sum of the
Cornell, inverse quadratic, and harmonic-type potential as the potential part
of the radial Schr\"{o}dinger equation. Analytical expressions for the energy
eigenvalues and the radial wave function are presented. Application of the
results for the heavy quarkonia and $B_c$ meson masses are good agreement with
the current experimental data except for zero angular momentum quantum numbers.
Numerical results for the temperature dependence indicates a different
behaviour for different quantum numbers. Temperature-dependent results are in
agreement with some QCD sum rule results from the ground states.
| [
{
"created": "Fri, 9 Apr 2021 09:02:12 GMT",
"version": "v1"
},
{
"created": "Sun, 23 May 2021 13:38:42 GMT",
"version": "v2"
}
] | 2021-05-25 | [
[
"Ahmadov",
"A. I.",
""
],
[
"Abasova",
"K. H.",
""
],
[
"Orucova",
"M. Sh.",
""
]
] | In this paper, we study the finite temperature-dependent Schr\"{o}dinger equation by using the Nikiforov-Uvarov method. We consider the sum of the Cornell, inverse quadratic, and harmonic-type potential as the potential part of the radial Schr\"{o}dinger equation. Analytical expressions for the energy eigenvalues and the radial wave function are presented. Application of the results for the heavy quarkonia and $B_c$ meson masses are good agreement with the current experimental data except for zero angular momentum quantum numbers. Numerical results for the temperature dependence indicates a different behaviour for different quantum numbers. Temperature-dependent results are in agreement with some QCD sum rule results from the ground states. |
hep-ph/0304277 | David Grellscheid | David Grellscheid | Required experimental accuracy to select between supersymmetrical models | 4 pages, 2 figures. Talk given at PASCOS '03, Mumbai, India, January
2003. To appear in the proceedings | Pramana62:655-658,2004 | 10.1007/BF02705339 | DAMTP-2003-41 | hep-ph | null | We will present a method to decide a priori whether various supersymmetrical
scenarios can be distinguished based on sparticle mass data alone. For each
model, a scan over all free SUSY breaking parameters reveals the extent of that
model's physically allowed region of sparticle-mass-space. Based on the
geometrical configuration of these regions in mass-space, it is possible to
obtain an estimate of the required accuracy of future sparticle mass
measurements to distinguish between the models. We will illustrate this
algorithm with an example. This talk is based on work done in collaboration
with B.C. Allanach (LAPTH, Annecy) and F. Quevedo (DAMTP, Cambridge).
| [
{
"created": "Tue, 29 Apr 2003 19:43:34 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Grellscheid",
"David",
""
]
] | We will present a method to decide a priori whether various supersymmetrical scenarios can be distinguished based on sparticle mass data alone. For each model, a scan over all free SUSY breaking parameters reveals the extent of that model's physically allowed region of sparticle-mass-space. Based on the geometrical configuration of these regions in mass-space, it is possible to obtain an estimate of the required accuracy of future sparticle mass measurements to distinguish between the models. We will illustrate this algorithm with an example. This talk is based on work done in collaboration with B.C. Allanach (LAPTH, Annecy) and F. Quevedo (DAMTP, Cambridge). |
hep-ph/9912355 | Sven-Olaf Moch | S. Moch and J.A.M. Vermaseren | Deep Inelastic Structure Functions at two Loops | 45 pages LaTeX | Nucl.Phys. B573 (2000) 853-907 | 10.1016/S0550-3213(00)00045-6 | NIKHEF 99-030 | hep-ph | null | We present the analytic calculation of the Mellin moments of the structure
functions F_2, F_3 and F_L in perturbative QCD up to second order corrections
and in leading twist approximation. We calculate the 2-loop contributions to
the anomalous dimensions of the singlet and non-singlet operator matrix
elements and the 2-loop coefficient functions of F_2, F_3 and F_L. We perform
the inverse Mellin transformation analytically and find our results in
agreement with earlier calculations in the literature by Zijlstra and van
Neerven.
| [
{
"created": "Wed, 15 Dec 1999 14:37:37 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Moch",
"S.",
""
],
[
"Vermaseren",
"J. A. M.",
""
]
] | We present the analytic calculation of the Mellin moments of the structure functions F_2, F_3 and F_L in perturbative QCD up to second order corrections and in leading twist approximation. We calculate the 2-loop contributions to the anomalous dimensions of the singlet and non-singlet operator matrix elements and the 2-loop coefficient functions of F_2, F_3 and F_L. We perform the inverse Mellin transformation analytically and find our results in agreement with earlier calculations in the literature by Zijlstra and van Neerven. |
2208.14792 | Raghunath Sahoo | Ronald Scaria, Captain R. Singh, and Raghunath Sahoo | Estimating the hadronic phase lifetime in heavy-ion collisions at the
Large Hadron Collider by employing a hydrodynamical framework | 6 pages and 3 figures. Submitted for publication | null | null | null | hep-ph hep-ex nucl-ex nucl-th | http://creativecommons.org/licenses/by-sa/4.0/ | Hadronic phase and its dynamics in relativistic heavy-ion collisions are
topics of immense discussion. In this respect, resonances can play an important
role in determining the characteristics of the hadronic phase as they have
sufficiently small lifetimes, which may be comparable to the hadronic phase
lifetime. The resonances produced at the QCD phase boundary undergo
re-scattering and regeneration processes within the hadronic medium. We use a
1+1D second-order viscous hydrodynamics for the evolution of hadronic medium to
govern $K^*(892)^0$ kinematics. Hydrodynamics breaks down at the Knudsen number
($Kn$) limit: $Kn>1$, where the mean free path becomes sufficiently large
compared to the system size and the particle yield gets preserved. Further, net
yields of $K^*(892)^0$ \& $K$ are obtained at the kinetic freeze-out boundary,
.i.e. $Kn>1$. In the current study, we predict hadronic phase lifetime and then
the ratio of $K^*(892)^0/K$ is obtained, which qualitatively agrees with the
experimental data as a function of the final state multiplicity.
| [
{
"created": "Wed, 31 Aug 2022 12:21:16 GMT",
"version": "v1"
}
] | 2022-09-01 | [
[
"Scaria",
"Ronald",
""
],
[
"Singh",
"Captain R.",
""
],
[
"Sahoo",
"Raghunath",
""
]
] | Hadronic phase and its dynamics in relativistic heavy-ion collisions are topics of immense discussion. In this respect, resonances can play an important role in determining the characteristics of the hadronic phase as they have sufficiently small lifetimes, which may be comparable to the hadronic phase lifetime. The resonances produced at the QCD phase boundary undergo re-scattering and regeneration processes within the hadronic medium. We use a 1+1D second-order viscous hydrodynamics for the evolution of hadronic medium to govern $K^*(892)^0$ kinematics. Hydrodynamics breaks down at the Knudsen number ($Kn$) limit: $Kn>1$, where the mean free path becomes sufficiently large compared to the system size and the particle yield gets preserved. Further, net yields of $K^*(892)^0$ \& $K$ are obtained at the kinetic freeze-out boundary, .i.e. $Kn>1$. In the current study, we predict hadronic phase lifetime and then the ratio of $K^*(892)^0/K$ is obtained, which qualitatively agrees with the experimental data as a function of the final state multiplicity. |
1110.6443 | Jay G. Wacker | Rouven Essig, Eder Izaguirre, Jared Kaplan, Jay G. Wacker | Heavy Flavor Simplified Models at the LHC | 33 pages, 17 figures, 5 tables | null | 10.1007/JHEP01(2012)074 | YITP-SB-11-34, SLAC-PUB-14658 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a comprehensive set of simplified models that contribute to final
states with top and bottom quarks at the LHC. These simplified models are used
to create minimal search strategies that ensure optimal coverage of new heavy
flavor physics involving the pair production of color octets and triplets. We
provide a set of benchmarks that are representative of model space, which can
be used by experimentalists to perform their own optimization of search
strategies. For data sets larger than 1/fb, same-sign dilepton and 3b search
regions become very powerful. Expected sensitivities from existing and
optimized searches are given.
| [
{
"created": "Fri, 28 Oct 2011 20:00:02 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Essig",
"Rouven",
""
],
[
"Izaguirre",
"Eder",
""
],
[
"Kaplan",
"Jared",
""
],
[
"Wacker",
"Jay G.",
""
]
] | We consider a comprehensive set of simplified models that contribute to final states with top and bottom quarks at the LHC. These simplified models are used to create minimal search strategies that ensure optimal coverage of new heavy flavor physics involving the pair production of color octets and triplets. We provide a set of benchmarks that are representative of model space, which can be used by experimentalists to perform their own optimization of search strategies. For data sets larger than 1/fb, same-sign dilepton and 3b search regions become very powerful. Expected sensitivities from existing and optimized searches are given. |
1605.09786 | Chi Xiong | Chi Xiong | Dark fermions from the Standard Model via spin-charge separation | 4 pages, double-column, no figures | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a new composite scenario of the lepton sector in the Standard Model
by a de-gauging procedure called spin-charge separation and propose that
leptons are bound states of some neutral fermions and Higgs bosons. Continuing
this procedure we may obtain more fundamental dark fermions. They become the
physical leptons by acquiring both charges and masses from some Higgs fields.
| [
{
"created": "Tue, 31 May 2016 19:43:28 GMT",
"version": "v1"
}
] | 2016-06-03 | [
[
"Xiong",
"Chi",
""
]
] | We study a new composite scenario of the lepton sector in the Standard Model by a de-gauging procedure called spin-charge separation and propose that leptons are bound states of some neutral fermions and Higgs bosons. Continuing this procedure we may obtain more fundamental dark fermions. They become the physical leptons by acquiring both charges and masses from some Higgs fields. |
2103.16545 | Juraj Klari\'c | Juraj Klari\'c, Mikhail Shaposhnikov and Inar Timiryasov | Reconciling resonant leptogenesis and baryogenesis via neutrino
oscillations | 41 pages plus appendix, 12 figures | Phys. Rev. D 104, 055010 (2021) | 10.1103/PhysRevD.104.055010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Right-handed neutrinos offer an elegant solution to two well established
phenomena beyond the Standard Model (SM) - masses and oscillations of
neutrinos, as well as the baryon asymmetry of the Universe. It is also a
minimalistic solution since it requires only singlet Majorana fermions to be
added to the SM particle content. If these fermions are nearly degenerate, the
mass scale of right-handed neutrinos can be very low and accessible by the
present and planned experiments. There are at least two well studied mechanisms
of the low-scale leptogenesis: baryogenesis via oscillations and resonant
leptogenesis. These two mechanisms were often considered separate, but they can
in fact be understood as two different regimes of one and the same mechanism,
described by a unique set of quantum kinetic equations. In this work we show,
using a unified description based on quantum kinetic equations, that the
parameter space of these two regimes of low-scale leptogenesis significantly
overlap. We present a comprehensive study of the parameter space of the
low-scale leptogenesis with the mass scale ranging from $0.1$ GeV to $\sim
10^6$ GeV. The unified perspective of this work reveals the synergy between
intensity and energy frontiers in the quest for heavy Majorana neutrinos.
| [
{
"created": "Tue, 30 Mar 2021 17:51:18 GMT",
"version": "v1"
}
] | 2021-09-15 | [
[
"Klarić",
"Juraj",
""
],
[
"Shaposhnikov",
"Mikhail",
""
],
[
"Timiryasov",
"Inar",
""
]
] | Right-handed neutrinos offer an elegant solution to two well established phenomena beyond the Standard Model (SM) - masses and oscillations of neutrinos, as well as the baryon asymmetry of the Universe. It is also a minimalistic solution since it requires only singlet Majorana fermions to be added to the SM particle content. If these fermions are nearly degenerate, the mass scale of right-handed neutrinos can be very low and accessible by the present and planned experiments. There are at least two well studied mechanisms of the low-scale leptogenesis: baryogenesis via oscillations and resonant leptogenesis. These two mechanisms were often considered separate, but they can in fact be understood as two different regimes of one and the same mechanism, described by a unique set of quantum kinetic equations. In this work we show, using a unified description based on quantum kinetic equations, that the parameter space of these two regimes of low-scale leptogenesis significantly overlap. We present a comprehensive study of the parameter space of the low-scale leptogenesis with the mass scale ranging from $0.1$ GeV to $\sim 10^6$ GeV. The unified perspective of this work reveals the synergy between intensity and energy frontiers in the quest for heavy Majorana neutrinos. |
1302.5537 | Florian Hebenstreit | Florian Hebenstreit, J\"urgen Berges, Daniil Gelfand | Simulating fermion production in 1+1 dimensional QED | 15 pages, 11 figures. Revised version: Discussion extended in section
III.A.2, PRD Version | Phys.Rev.D87:105006,2013 | 10.1103/PhysRevD.87.105006 | null | hep-ph hep-lat nucl-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate fermion--anti-fermion production in 1+1 dimensional QED using
real-time lattice techniques. In this non-perturbative approach the full
quantum dynamics of fermions is included while the gauge field dynamics can be
accurately represented by classical-statistical simulations for relevant field
strengths. We compute the non-equilibrium time evolution of gauge invariant
correlation functions implementing 'low-cost' Wilson fermions. Introducing a
lattice generalization of the Dirac-Heisenberg-Wigner function, we recover the
Schwinger formula in 1+1 dimensions in the limit of a static background field.
We discuss the decay of the field due to the backreaction of the created
fermion--anti-fermion pairs and apply the approach to strongly inhomogeneous
gauge fields. The latter allows us to discuss the striking phenomenon of a
linear rising potential building up between produced fermion bunches after the
initial electric pulse ceased.
| [
{
"created": "Fri, 22 Feb 2013 10:19:09 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Apr 2013 08:22:17 GMT",
"version": "v2"
}
] | 2013-05-24 | [
[
"Hebenstreit",
"Florian",
""
],
[
"Berges",
"Jürgen",
""
],
[
"Gelfand",
"Daniil",
""
]
] | We investigate fermion--anti-fermion production in 1+1 dimensional QED using real-time lattice techniques. In this non-perturbative approach the full quantum dynamics of fermions is included while the gauge field dynamics can be accurately represented by classical-statistical simulations for relevant field strengths. We compute the non-equilibrium time evolution of gauge invariant correlation functions implementing 'low-cost' Wilson fermions. Introducing a lattice generalization of the Dirac-Heisenberg-Wigner function, we recover the Schwinger formula in 1+1 dimensions in the limit of a static background field. We discuss the decay of the field due to the backreaction of the created fermion--anti-fermion pairs and apply the approach to strongly inhomogeneous gauge fields. The latter allows us to discuss the striking phenomenon of a linear rising potential building up between produced fermion bunches after the initial electric pulse ceased. |
2306.04307 | Lei Chang | Hao Dang, Zanbin Xing, M. Atif Sultan, Kh\'epani Raya and Lei Chang | The chiral anomaly and the pion transition form factor: beyond the
cutoff | 9 pages, 2 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the presence of a momentum cutoff, effective theories seem unable to
faithfully reproduce the so called chiral anomaly in the Standard Model. A
novel prospect to overcome this related issue is discussed herein via the
calculation of the $\gamma^{*}\pi^0\gamma$ transition form factor, $G^{\gamma^*
\pi^0 \gamma}(Q^2)$, whose normalization is intimately connected with the
chiral anomaly and dynamical chiral symmetry breaking (DCSB). To compute such
transition, we employ contact interaction model of Quantum Chromodynamics (QCD)
under a modified rainbow ladder truncation, which automatically generates a
quark anomalous magnetic moment term, weighted by a strenght parameter $\xi$.
This term, whose origin is also connected with DCSB, is interpreted as an
additional interaction that mimics the complex dynamics beyond the cutoff. By
fixing $\xi$ to produce the value of $G^{\gamma^* \pi^0 \gamma}(0)$ dictated by
the chiral anomaly, the computed transition form factor, as well as the
interaction radius and neutral pion decay width, turn out to be comparable with
QCD-based studies and experimental data.
| [
{
"created": "Wed, 7 Jun 2023 10:12:45 GMT",
"version": "v1"
}
] | 2023-06-08 | [
[
"Dang",
"Hao",
""
],
[
"Xing",
"Zanbin",
""
],
[
"Sultan",
"M. Atif",
""
],
[
"Raya",
"Khépani",
""
],
[
"Chang",
"Lei",
""
]
] | In the presence of a momentum cutoff, effective theories seem unable to faithfully reproduce the so called chiral anomaly in the Standard Model. A novel prospect to overcome this related issue is discussed herein via the calculation of the $\gamma^{*}\pi^0\gamma$ transition form factor, $G^{\gamma^* \pi^0 \gamma}(Q^2)$, whose normalization is intimately connected with the chiral anomaly and dynamical chiral symmetry breaking (DCSB). To compute such transition, we employ contact interaction model of Quantum Chromodynamics (QCD) under a modified rainbow ladder truncation, which automatically generates a quark anomalous magnetic moment term, weighted by a strenght parameter $\xi$. This term, whose origin is also connected with DCSB, is interpreted as an additional interaction that mimics the complex dynamics beyond the cutoff. By fixing $\xi$ to produce the value of $G^{\gamma^* \pi^0 \gamma}(0)$ dictated by the chiral anomaly, the computed transition form factor, as well as the interaction radius and neutral pion decay width, turn out to be comparable with QCD-based studies and experimental data. |
0910.2562 | Francis Bursa | Francis Bursa, Luigi Del Debbio, Liam Keegan, Claudio Pica, Thomas
Pickup | Running of the coupling and quark mass in SU(2) with two adjoint
fermions | Talk presented at the XXVII International Symposium on Lattice Field
Theory, July 26-31, 2009, Peking University, Beijing, China; 7 pages, 4
figures | PoS LAT2009:056,2009 | null | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We simulate SU(2) gauge theory with two massless Dirac fermions in the
adjoint representation. We calculate the running of the Schroedinger Functional
coupling and the renormalised quark mass over a wide range of length scales.
The running of the coupling is consistent with the existence of an infrared
fixed point (IRFP), and we find 0.07 < gamma < 0.56 at the IRFP, depending on
the value of the critical coupling.
| [
{
"created": "Wed, 14 Oct 2009 09:17:00 GMT",
"version": "v1"
}
] | 2010-11-05 | [
[
"Bursa",
"Francis",
""
],
[
"Del Debbio",
"Luigi",
""
],
[
"Keegan",
"Liam",
""
],
[
"Pica",
"Claudio",
""
],
[
"Pickup",
"Thomas",
""
]
] | We simulate SU(2) gauge theory with two massless Dirac fermions in the adjoint representation. We calculate the running of the Schroedinger Functional coupling and the renormalised quark mass over a wide range of length scales. The running of the coupling is consistent with the existence of an infrared fixed point (IRFP), and we find 0.07 < gamma < 0.56 at the IRFP, depending on the value of the critical coupling. |
2407.02133 | Peter Meinzinger | Frank Krauss, Peter Meinzinger | Hard Diffraction in Sherpa | 18 pages, 9 figures | null | null | IPPP/24/39, MCNET-24-12 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We present the first complete simulation framework for the simulation of jet
production in diffractive events at next-to leading order in QCD, matched to
the parton shower. We validate the implementation in the SHERPA event generator
with data from the H1 and ZEUS experiments for diffractive DIS and diffractive
photoproduction. For the latter, we review different models aiming to explain
the observed factorisation breaking and we argue that at NLO the direct
component must also be suppressed. We provide predictions for diffractive jet
production both in DIS and in photoproduction events for the upcoming EIC.
| [
{
"created": "Tue, 2 Jul 2024 10:26:10 GMT",
"version": "v1"
}
] | 2024-07-03 | [
[
"Krauss",
"Frank",
""
],
[
"Meinzinger",
"Peter",
""
]
] | We present the first complete simulation framework for the simulation of jet production in diffractive events at next-to leading order in QCD, matched to the parton shower. We validate the implementation in the SHERPA event generator with data from the H1 and ZEUS experiments for diffractive DIS and diffractive photoproduction. For the latter, we review different models aiming to explain the observed factorisation breaking and we argue that at NLO the direct component must also be suppressed. We provide predictions for diffractive jet production both in DIS and in photoproduction events for the upcoming EIC. |
hep-ph/9805375 | F. . Krauss | I. F. Ginzburg, U. D. Jentschura, S. G. Karshenboim, F. Krauss, V. G.
Serbo, G. Soff | Production of bound {$\mu^{+}\mu^{-}$}-systems in relativistic heavy ion
collisions | 20 pages, RevTex, 7 figures | Phys.Rev.C58:3565-3573,1998 | 10.1103/PhysRevC.58.3565 | null | hep-ph | null | Dimuonium (the bound system of two muons, $\mu^+\mu^-$-atom) has not been
observed yet. In this paper we discuss the electromagnetic production of
dimuonium at RHIC and LHC in relativistic heavy ion collisions. The production
of parastates is analyzed in the equivalent photon approximation. For the
treatment of orthostates, we develop a three photon formalism. We determine the
production rates at RHIC and LHC with an accuracy of a few percent and discuss
problems related to the observation of dimuonium.
| [
{
"created": "Tue, 19 May 1998 13:51:58 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ginzburg",
"I. F.",
""
],
[
"Jentschura",
"U. D.",
""
],
[
"Karshenboim",
"S. G.",
""
],
[
"Krauss",
"F.",
""
],
[
"Serbo",
"V. G.",
""
],
[
"Soff",
"G.",
""
]
] | Dimuonium (the bound system of two muons, $\mu^+\mu^-$-atom) has not been observed yet. In this paper we discuss the electromagnetic production of dimuonium at RHIC and LHC in relativistic heavy ion collisions. The production of parastates is analyzed in the equivalent photon approximation. For the treatment of orthostates, we develop a three photon formalism. We determine the production rates at RHIC and LHC with an accuracy of a few percent and discuss problems related to the observation of dimuonium. |
hep-ph/0408288 | Miroslav Pardy | Miroslav Pardy | Volkov solution for an electron in the two wave fields | 11pp | null | null | PALS-MUNI-2004-53 | hep-ph | null | It is considered the Dirac equation with two different four-potentials of the
plane electromagnetic waves. We derive the equation for the wave function which
is generalized form of the Volkov equation. We find the solutions of the Dirac
equation for two orthogonal waves. We determine the modified Compton formula
for the scattering of two photons on an electron.
| [
{
"created": "Wed, 25 Aug 2004 20:23:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pardy",
"Miroslav",
""
]
] | It is considered the Dirac equation with two different four-potentials of the plane electromagnetic waves. We derive the equation for the wave function which is generalized form of the Volkov equation. We find the solutions of the Dirac equation for two orthogonal waves. We determine the modified Compton formula for the scattering of two photons on an electron. |
hep-ph/0105232 | Stephane Pepin | S. Pepin and Fl. Stancu | On a three-body confinement force in hadron spectroscopy | 19 pages (RevTeX), addition of new material regarding the NN
interaction, more accurate discussion of the baryonic case, accepted for
publication in Phys. Rev. D | Phys.Rev. D65 (2002) 054032 | 10.1103/PhysRevD.65.054032 | ECT*-01-012 | hep-ph nucl-th | null | Recently it has been argued that a three-body colour confinement interaction
can affect the stability condition of a three-quark system and the spectrum of
a tetraquark described by any constituent quark model. Here we discuss the role
of a three-body colour confinement interaction in a simple quark model and
present some of its implications for the spectra of baryons, tetraquarks and
six-quark systems.
| [
{
"created": "Tue, 22 May 2001 18:38:12 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jul 2001 08:45:33 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Sep 2001 10:01:02 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Pepin",
"S.",
""
],
[
"Stancu",
"Fl.",
""
]
] | Recently it has been argued that a three-body colour confinement interaction can affect the stability condition of a three-quark system and the spectrum of a tetraquark described by any constituent quark model. Here we discuss the role of a three-body colour confinement interaction in a simple quark model and present some of its implications for the spectra of baryons, tetraquarks and six-quark systems. |
hep-ph/0407307 | Jose Bordes | F. Bodi-Esteban, J. Bordes and J. Penarrocha | B and B_S decay constants from moments of Finite Energy Sum Rules in QCD | 11 pages, 2 figures | Eur.Phys.J. C38 (2004) 277-281 | 10.1140/epjc/s2004-02020-3 | null | hep-ph | null | We use an appropriate combination of moments of finite energy sum rules in
QCD in order to compute the B_q-meson decays constants f_B and f_{B_s}.We
perform the calculation using a two-loop computation of the imaginary part of
the pseudoscalar two point function in terms of the running bottom quark mass.
The results are stable with the so called QCD duality threshold and they are in
agreement with the estimates obtained from Borel transform QCD sum rules and
lattice computations.
| [
{
"created": "Tue, 27 Jul 2004 14:06:39 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Sep 2004 11:11:07 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Bodi-Esteban",
"F.",
""
],
[
"Bordes",
"J.",
""
],
[
"Penarrocha",
"J.",
""
]
] | We use an appropriate combination of moments of finite energy sum rules in QCD in order to compute the B_q-meson decays constants f_B and f_{B_s}.We perform the calculation using a two-loop computation of the imaginary part of the pseudoscalar two point function in terms of the running bottom quark mass. The results are stable with the so called QCD duality threshold and they are in agreement with the estimates obtained from Borel transform QCD sum rules and lattice computations. |
hep-ph/9910299 | Raju Venugopalan | Jamal Jalilian-Marian (Arizona), Sangyong Jeon (LBL), Raju Venugopalan
(BNL), Jens Wirstam (Stockholm) | Minding one's P's and Q's : from the one loop effective action in
quantum field theory to classical transport theory | Latex, 29 pgs., uses axodraw.sty; revised version with updated
references, and typos corrected | Phys.Rev. D62 (2000) 045020 | 10.1103/PhysRevD.62.045020 | null | hep-ph hep-th nucl-th | null | The one loop effective action in quantum field theory can be expressed as a
quantum mechanical path integral over world lines, with internal symmetries
represented by Grassmanian variables. In this paper, we develop a real time,
many body, world line formalism for the one loop effective action. In
particular, we study hot QCD and obtain the classical transport equations
which, as Litim and Manuel have shown, reduce in the appropriate limit to the
non-Abelian Boltzmann-Langevin equation first obtained by B\"{o}deker. In the
Vlasov limit, the classical kinetic equations are those that correspond to the
hard thermal loop effective action. We also discuss the imaginary time world
line formalism for a hot $\phi^4$ theory, and elucidate its relation to
classical transport theory.
| [
{
"created": "Mon, 11 Oct 1999 19:52:26 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Nov 1999 02:33:49 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Jalilian-Marian",
"Jamal",
"",
"Arizona"
],
[
"Jeon",
"Sangyong",
"",
"LBL"
],
[
"Venugopalan",
"Raju",
"",
"BNL"
],
[
"Wirstam",
"Jens",
"",
"Stockholm"
]
] | The one loop effective action in quantum field theory can be expressed as a quantum mechanical path integral over world lines, with internal symmetries represented by Grassmanian variables. In this paper, we develop a real time, many body, world line formalism for the one loop effective action. In particular, we study hot QCD and obtain the classical transport equations which, as Litim and Manuel have shown, reduce in the appropriate limit to the non-Abelian Boltzmann-Langevin equation first obtained by B\"{o}deker. In the Vlasov limit, the classical kinetic equations are those that correspond to the hard thermal loop effective action. We also discuss the imaginary time world line formalism for a hot $\phi^4$ theory, and elucidate its relation to classical transport theory. |
hep-ph/0504177 | Harmen J. Warringa | Harmen J. Warringa, Daniel Boer, Jens O. Andersen | Color superconductivity vs. pseudoscalar condensation in a three-flavor
NJL model | 8 pages, 7 figures, revtex. References added, minor other changes,
conclusions unchanged. To appear in PRD | Phys.Rev. D72 (2005) 014015 | 10.1103/PhysRevD.72.014015 | null | hep-ph | null | We calculate numerically the phase diagram of the three-flavor
Nambu-Jona-Lasinio model at zero and finite temperature as a function of the
up, down, and strange quark chemical potentials. We focus on the competition
between pseudoscalar condensation and color superconductivity. We find that the
two types of phases are separated by first-order transitions.
| [
{
"created": "Wed, 20 Apr 2005 16:19:37 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Jul 2005 07:50:13 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Warringa",
"Harmen J.",
""
],
[
"Boer",
"Daniel",
""
],
[
"Andersen",
"Jens O.",
""
]
] | We calculate numerically the phase diagram of the three-flavor Nambu-Jona-Lasinio model at zero and finite temperature as a function of the up, down, and strange quark chemical potentials. We focus on the competition between pseudoscalar condensation and color superconductivity. We find that the two types of phases are separated by first-order transitions. |
hep-ph/0410239 | Kyungsik Kang | Kyungsik Kang | Gauge/String-Gravity Duality and Froissart Bound | 10 pages, Presented to the Coral Gables Conference 2003, Launching of
BelleE\'poque in High Energy Physics and Cosmology, 17 - 21 December 2003,
Fort Lauderdale, Florida | Int.J.Mod.Phys. A20 (2005) 1286-1294 | 10.1142/S0217751X05024183 | Brown-HET-1403 | hep-ph | null | The gauge/string-gravity duality correspondence opened renewed hope and
possibility to address some of the fundamental and non-perturbative QCD
problems in particle physics, such as hadron spectrum and Regge behavior of the
scattering amplitude at high energies. One of the most fundamental and
long-standing problem is the high energy behavior of total cross-sections.
According to a series of exhaustive tests by the COMPETE group, (1). total
cross-sections have a universal Heisenberg behavior in energy corresponding to
the maximal energy behavior allowed by the Froissart bound, i.e., $A + B ln^2
(s/s_0)$ with $B \sim 0.32 mb$ and $s_0 \sim 34.41 GeV^2$ for all reactions,
and (2). the factorization relation among $\sigma_{pp, even}, \sigma_{\gamma
p}, and \sigma_{\gamma \gamma}$ is well satisfied by experiments. I discuss the
recent interesting application of the gauge/string-gravity duality of $AdS/CFT$
correspondence with a deformed background metric so as to break the conformal
symmetry that can lead to the Heisenberg behavior of rising total
cross-sections, and present some preliminary results on the high energy QCD
from Planckian scattering in $AdS$ and black-hole production.
| [
{
"created": "Sat, 16 Oct 2004 00:54:38 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Kang",
"Kyungsik",
""
]
] | The gauge/string-gravity duality correspondence opened renewed hope and possibility to address some of the fundamental and non-perturbative QCD problems in particle physics, such as hadron spectrum and Regge behavior of the scattering amplitude at high energies. One of the most fundamental and long-standing problem is the high energy behavior of total cross-sections. According to a series of exhaustive tests by the COMPETE group, (1). total cross-sections have a universal Heisenberg behavior in energy corresponding to the maximal energy behavior allowed by the Froissart bound, i.e., $A + B ln^2 (s/s_0)$ with $B \sim 0.32 mb$ and $s_0 \sim 34.41 GeV^2$ for all reactions, and (2). the factorization relation among $\sigma_{pp, even}, \sigma_{\gamma p}, and \sigma_{\gamma \gamma}$ is well satisfied by experiments. I discuss the recent interesting application of the gauge/string-gravity duality of $AdS/CFT$ correspondence with a deformed background metric so as to break the conformal symmetry that can lead to the Heisenberg behavior of rising total cross-sections, and present some preliminary results on the high energy QCD from Planckian scattering in $AdS$ and black-hole production. |
0904.0059 | Wei-Min Sun | Min He, Fei Hu, Wei-Min Sun, Hong-Shi Zong | Crossover from a continuum study of chiral susceptibility | 15 pages, 2 figures, revtex4 | Phys.Lett.B675:32-37,2009 | 10.1016/j.physletb.2009.03.076 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a model-independent integral formula for chiral susceptibility and
attempt to present a continuum model study of it within the framework of
Dyson-Schwinger Equations. An appropriate regularization is implemented to
remove the temperature-independent quadratic divergence inherent in this
quantity. While it demonstrates a second-order phase transition characteristic
in the chiral limit, the result obtained supports a crossover at physical
current quark masses, which is in good agreement with recent lattice studies.
| [
{
"created": "Wed, 1 Apr 2009 05:04:28 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"He",
"Min",
""
],
[
"Hu",
"Fei",
""
],
[
"Sun",
"Wei-Min",
""
],
[
"Zong",
"Hong-Shi",
""
]
] | We derive a model-independent integral formula for chiral susceptibility and attempt to present a continuum model study of it within the framework of Dyson-Schwinger Equations. An appropriate regularization is implemented to remove the temperature-independent quadratic divergence inherent in this quantity. While it demonstrates a second-order phase transition characteristic in the chiral limit, the result obtained supports a crossover at physical current quark masses, which is in good agreement with recent lattice studies. |
1812.08077 | Felix Ringer | Xiaohui Liu, Felix Ringer, Werner Vogelsang, Feng Yuan | Lepton-jet Correlations in Deep Inelastic Scattering at the Electron-Ion
Collider | 6 pages, 4 figures | Phys. Rev. Lett. 122, 192003 (2019) | 10.1103/PhysRevLett.122.192003 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose the lepton-jet correlation in deep inelastic scattering as a
unique tool for nucleon/nucleus tomography at the electron-ion collider. The
azimuthal angular correlation between the final state lepton and jet depends on
the transverse momentum dependent quark distributions. We take the example of
single transverse spin asymmetries to show the sensitivity to the quark Sivers
function. When the correlation is studied in lepton-nucleus collisions,
transverse momentum broadening effects can be used to explore cold nuclear
matter effects. These features make lepton-jet correlations an important new
hard probe at the EIC.
| [
{
"created": "Wed, 19 Dec 2018 16:52:36 GMT",
"version": "v1"
}
] | 2019-05-22 | [
[
"Liu",
"Xiaohui",
""
],
[
"Ringer",
"Felix",
""
],
[
"Vogelsang",
"Werner",
""
],
[
"Yuan",
"Feng",
""
]
] | We propose the lepton-jet correlation in deep inelastic scattering as a unique tool for nucleon/nucleus tomography at the electron-ion collider. The azimuthal angular correlation between the final state lepton and jet depends on the transverse momentum dependent quark distributions. We take the example of single transverse spin asymmetries to show the sensitivity to the quark Sivers function. When the correlation is studied in lepton-nucleus collisions, transverse momentum broadening effects can be used to explore cold nuclear matter effects. These features make lepton-jet correlations an important new hard probe at the EIC. |
1602.03810 | Julian Heeck | Julian Heeck | Lepton flavor violation with light vector bosons | 6 pages, 3 figures. Matches PLB version | Phys. Lett. B 758, 101 (2016) | 10.1016/j.physletb.2016.05.007 | ULB-TH/16-02 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New sub-GeV vector bosons with couplings to muons but not electrons have been
discussed in order to explain the muon's magnetic moment, the gap of
high-energy neutrinos in IceCube or the proton radius puzzle. If such a light
Z' not only violates lepton universality but also lepton flavor, as expected
for example from the recent hint for $h\to\mu\tau$ at CMS, the two-body decay
mode $\tau \to \mu Z'$ opens up and for $M_{Z'} < 2 m_\mu$ gives better
constraints than $\tau\to 3\mu$ already with 20-year-old ARGUS limits. We
discuss the general prospects and motivation of light vector bosons with
lepton-flavor-violating couplings.
| [
{
"created": "Thu, 11 Feb 2016 18:10:10 GMT",
"version": "v1"
},
{
"created": "Tue, 10 May 2016 08:01:23 GMT",
"version": "v2"
}
] | 2016-05-11 | [
[
"Heeck",
"Julian",
""
]
] | New sub-GeV vector bosons with couplings to muons but not electrons have been discussed in order to explain the muon's magnetic moment, the gap of high-energy neutrinos in IceCube or the proton radius puzzle. If such a light Z' not only violates lepton universality but also lepton flavor, as expected for example from the recent hint for $h\to\mu\tau$ at CMS, the two-body decay mode $\tau \to \mu Z'$ opens up and for $M_{Z'} < 2 m_\mu$ gives better constraints than $\tau\to 3\mu$ already with 20-year-old ARGUS limits. We discuss the general prospects and motivation of light vector bosons with lepton-flavor-violating couplings. |
hep-ph/9603374 | Paolo Gambino | G. Degrassi (1), P. Gambino (2), A. Vicini (1), ((1) Padova, (2) Max
Planck Munich) | Two-loop heavy top effects on the MZ-MW interdependence | 11 pages, LaTeX, includes 1 LaTeX figure, uses equations.sty and
cite.sty, one minor comment and interpolation function for variable mtop
added, no change in the results | Phys.Lett. B383 (1996) 219-226 | 10.1016/0370-2693(96)00720-4 | DFPD 96/TH/20, MPI-PhT-96-17 | hep-ph | null | The O(alpha^2 mt^2/mw^2) correction to the relation between G_\mu and the
vector boson masses is computed in the MSbar scheme, and the results are used
to investigate the magnitude of the effect on the theoretical prediction of mw
and sin^2\theta_\msbar(mz) from alpha, G_\mu, and mz.
| [
{
"created": "Thu, 21 Mar 1996 23:20:48 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Apr 1996 15:24:12 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Degrassi",
"G.",
""
],
[
"Gambino",
"P.",
""
],
[
"Vicini",
"A.",
""
]
] | The O(alpha^2 mt^2/mw^2) correction to the relation between G_\mu and the vector boson masses is computed in the MSbar scheme, and the results are used to investigate the magnitude of the effect on the theoretical prediction of mw and sin^2\theta_\msbar(mz) from alpha, G_\mu, and mz. |
1412.5385 | Bastian Kubis | Bastian Kubis, Franz Niecknig | Analysis of the J/psi --> pi^0 gamma^* transition form factor | 6 pages, 3 figures; v2 matches version published in Phys. Rev. D | Phys. Rev. D 91, 036004 (2015) | 10.1103/PhysRevD.91.036004 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In view of the first measurement of the branching fraction for J/psi --> pi^0
e^+ e^- by the BESIII collaboration, we analyze what can be learnt on the
corresponding transition form factor using dispersion theory. We show that
light-quark degrees of freedom dominate the spectral function, in particular
two-pion intermediate states. Estimating the effects of multi-pion states as
well as charmonium, we arrive at a prediction for the complete form factor that
should be scrutinized experimentally in the future.
| [
{
"created": "Wed, 17 Dec 2014 13:39:17 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Feb 2015 15:40:05 GMT",
"version": "v2"
}
] | 2015-03-05 | [
[
"Kubis",
"Bastian",
""
],
[
"Niecknig",
"Franz",
""
]
] | In view of the first measurement of the branching fraction for J/psi --> pi^0 e^+ e^- by the BESIII collaboration, we analyze what can be learnt on the corresponding transition form factor using dispersion theory. We show that light-quark degrees of freedom dominate the spectral function, in particular two-pion intermediate states. Estimating the effects of multi-pion states as well as charmonium, we arrive at a prediction for the complete form factor that should be scrutinized experimentally in the future. |
hep-ph/0612019 | Hiroyuki Kawamura | Hiroyuki Kawamura, Jiro Kodaira and Kazuhiro Tanaka | QCD Prediction of $A_{TT}$ for Small $Q_T$ Dimuon Production in $pp$ and
$p\bar{p} Collisions | 4 pages, 2 figures. Talk presented at SPIN2006, October 2-7, 206,
Kyoto, Japan | AIPConf.Proc.915:599-602,2007 | 10.1063/1.2750852 | null | hep-ph | null | We present QCD prediction of double-spin asymmetries ($A_{TT}$) in
transversely polarized Drell-Yan process at small transverse momentum $Q_T$ of
dimuon. Resummation of large logarithmic corrections, relevant in small $Q_T$
region, is performed up to next-to-leading logarithmic (NLL) accuracy. $A_{TT}$
at RHIC, J-PARC and GSI are studied numerically in the corresponding kinematic
regions.We show that the large $A_{TT}$ is obtained for small $Q_T$ and
moderate energies.
| [
{
"created": "Sun, 3 Dec 2006 04:19:31 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kawamura",
"Hiroyuki",
""
],
[
"Kodaira",
"Jiro",
""
],
[
"Tanaka",
"Kazuhiro",
""
]
] | We present QCD prediction of double-spin asymmetries ($A_{TT}$) in transversely polarized Drell-Yan process at small transverse momentum $Q_T$ of dimuon. Resummation of large logarithmic corrections, relevant in small $Q_T$ region, is performed up to next-to-leading logarithmic (NLL) accuracy. $A_{TT}$ at RHIC, J-PARC and GSI are studied numerically in the corresponding kinematic regions.We show that the large $A_{TT}$ is obtained for small $Q_T$ and moderate energies. |
hep-ph/0506211 | Konstantin Boreskov | K.G. Boreskov, A.B. Kaidalov, V.A. Khoze, A.D. Martin and M.G. Ryskin | The partonic interpretation of reggeon theory models | 18 pages, 8 figures. Refs. [20],[21] added, and the comparison with
results of [21] inserted | Eur.Phys.J.C44:523-531,2005 | 10.1140/epjc/s2005-02376-8 | null | hep-ph | null | We review a physical content of the two simplest models of reggeon field
theory: namely the eikonal and the Schwimmer models. The AGK cutting rules are
used to obtain the inclusive, the inelastic and the diffractive cross sections.
The system of nonlinear equations for these cross sections is written down and
analytic expressions for its solution are obtained. We derive the rapidity gap
dependence of the differential cross sections for diffractive dissociation in
the Schwimmer model and in its eikonalized extension. The results are
interpreted from the partonic viewpoint of the interaction at high energies.
| [
{
"created": "Wed, 22 Jun 2005 11:32:09 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Jul 2005 10:19:14 GMT",
"version": "v2"
}
] | 2009-01-07 | [
[
"Boreskov",
"K. G.",
""
],
[
"Kaidalov",
"A. B.",
""
],
[
"Khoze",
"V. A.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Ryskin",
"M. G.",
""
]
] | We review a physical content of the two simplest models of reggeon field theory: namely the eikonal and the Schwimmer models. The AGK cutting rules are used to obtain the inclusive, the inelastic and the diffractive cross sections. The system of nonlinear equations for these cross sections is written down and analytic expressions for its solution are obtained. We derive the rapidity gap dependence of the differential cross sections for diffractive dissociation in the Schwimmer model and in its eikonalized extension. The results are interpreted from the partonic viewpoint of the interaction at high energies. |
1108.1492 | Farida Tahir | Farida Tahir, Azeem Mir | Study of semileptonic decays of D_{s} meson within R-parity violating
supersymmetric model | 12pages,13 Figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the comaprative study of semileptonic and leptonic decays of
D_{s},D^{\pm} and D^0 meson (D\rightarrowM
l_{{\alpha}}^+l_{{\beta}}^-,D\rightarrowl_{{\alpha}}^+l_{{\beta}}^-,D\rightarrowl_{{\alpha}}^+v_{{\alpha}};{\alpha},{\beta}=e,{\mu})
within the framework of R-parity violating (R_{p}) Minimal Supersymmetric
Standard Model (MSSM). The comparison shows that combination and product
couplings ({\lambda}_{{\beta}i{\alpha}}{\lambda}_{ijq}^{'\ast} or
{\lambda}_{{\beta}qk}'{\lambda}_{{\alpha}jk}^{'\ast}) contribution to the
branching fractions of the said processes rocesses(under consideration) is
consistent or comparable to the experimental measurements in most of the cases.
However, there exists some cases, where these contributions are suppressed but
still comparable to that of standard model.
| [
{
"created": "Sat, 6 Aug 2011 15:57:28 GMT",
"version": "v1"
}
] | 2011-08-09 | [
[
"Tahir",
"Farida",
""
],
[
"Mir",
"Azeem",
""
]
] | We present the comaprative study of semileptonic and leptonic decays of D_{s},D^{\pm} and D^0 meson (D\rightarrowM l_{{\alpha}}^+l_{{\beta}}^-,D\rightarrowl_{{\alpha}}^+l_{{\beta}}^-,D\rightarrowl_{{\alpha}}^+v_{{\alpha}};{\alpha},{\beta}=e,{\mu}) within the framework of R-parity violating (R_{p}) Minimal Supersymmetric Standard Model (MSSM). The comparison shows that combination and product couplings ({\lambda}_{{\beta}i{\alpha}}{\lambda}_{ijq}^{'\ast} or {\lambda}_{{\beta}qk}'{\lambda}_{{\alpha}jk}^{'\ast}) contribution to the branching fractions of the said processes rocesses(under consideration) is consistent or comparable to the experimental measurements in most of the cases. However, there exists some cases, where these contributions are suppressed but still comparable to that of standard model. |
1203.6838 | Tim Jones | Mark Hindmarsh and D. R. Timothy Jones | Strictly Anomaly Mediated Supersymmetry Breaking | 38 pages, 1 figure. Discussion of 125GeV Higgs possibility, and of
U(1) decoupling limit | null | 10.1103/PhysRevD.87.075022 | LTH 939; HIP-2012-10/TH | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider an MSSM extension with anomaly mediation as the source of
supersymmetry-breaking, and a U(1) symmetry which solves the tachyonic slepton
problem, and introduces both the see-saw mechanism for neutrino masses, and the
Higgs mu-term. We compare its spectra with those from so-called minimal anomaly
mediated supersymmetry breaking. We find a Standard Model-like Higgs of mass
125 GeV with a gravitino mass of 140 TeV and tan(beta)=16. However, the muon
anomalous magnetic moment is 3 sigma away from the experimental value.
The model naturally produces a period of hybrid inflation, which can exit to
a false vacuum characterised by large Higgs vevs, reaching the true ground
state after a period of thermal inflation. The scalar spectral index is reduced
to approximately 0.975, and the correct abundance of neutralino dark matter can
be produced by decays of thermally-produced gravitinos, provided the gravitino
mass (and hence the Higgs mass) is high. Naturally light cosmic strings are
produced, satisfying bounds from the Cosmic Microwave Background. The
complementary pulsar timing and cosmic ray bounds require that strings decay
primarily via loops into gravitational waves. Unless the loops are extremely
small, the next generation pulsar timing array will rule out or detect the
string-derived gravitational radiation background in this model.
| [
{
"created": "Fri, 30 Mar 2012 15:34:48 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Apr 2012 15:37:26 GMT",
"version": "v2"
},
{
"created": "Fri, 20 Jul 2012 16:23:31 GMT",
"version": "v3"
}
] | 2015-06-04 | [
[
"Hindmarsh",
"Mark",
""
],
[
"Jones",
"D. R. Timothy",
""
]
] | We consider an MSSM extension with anomaly mediation as the source of supersymmetry-breaking, and a U(1) symmetry which solves the tachyonic slepton problem, and introduces both the see-saw mechanism for neutrino masses, and the Higgs mu-term. We compare its spectra with those from so-called minimal anomaly mediated supersymmetry breaking. We find a Standard Model-like Higgs of mass 125 GeV with a gravitino mass of 140 TeV and tan(beta)=16. However, the muon anomalous magnetic moment is 3 sigma away from the experimental value. The model naturally produces a period of hybrid inflation, which can exit to a false vacuum characterised by large Higgs vevs, reaching the true ground state after a period of thermal inflation. The scalar spectral index is reduced to approximately 0.975, and the correct abundance of neutralino dark matter can be produced by decays of thermally-produced gravitinos, provided the gravitino mass (and hence the Higgs mass) is high. Naturally light cosmic strings are produced, satisfying bounds from the Cosmic Microwave Background. The complementary pulsar timing and cosmic ray bounds require that strings decay primarily via loops into gravitational waves. Unless the loops are extremely small, the next generation pulsar timing array will rule out or detect the string-derived gravitational radiation background in this model. |
1211.4265 | Michael Eides | Michael I. Eides and Valery A. Shelyuto | Light-by-Light Scattering Single-Logarithmic Corrections to Hyperfine
Splitting in Muonium | 21 page, 3 figures | null | 10.1103/PhysRevD.87.013005 | UK/12-11 | hep-ph physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider three-loop radiative-recoil corrections to hyperfine splitting in
muonium generated by the gauge invariant set of diagrams with virtual
light-by-light scattering block. These corrections are enhanced by the large
logarithms of the electron-muon mass ratio. We present the results of an
analytic calculation of the single-logarithmic radiative-recoil corrections of
order $\alpha^2(Z\alpha)(m/M)E_F$ to hyperfine splitting in muonium generated
by these diagrams.
| [
{
"created": "Sun, 18 Nov 2012 22:38:42 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Dec 2012 00:44:39 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Eides",
"Michael I.",
""
],
[
"Shelyuto",
"Valery A.",
""
]
] | We consider three-loop radiative-recoil corrections to hyperfine splitting in muonium generated by the gauge invariant set of diagrams with virtual light-by-light scattering block. These corrections are enhanced by the large logarithms of the electron-muon mass ratio. We present the results of an analytic calculation of the single-logarithmic radiative-recoil corrections of order $\alpha^2(Z\alpha)(m/M)E_F$ to hyperfine splitting in muonium generated by these diagrams. |
hep-ph/0002241 | Boris Kopeliovich | B.Z. Kopeliovich, I.K. Potashnikova, B. Povh and E. Predazzi | Nonperturbative Gluon Radiation and Energy Dependence of Elastic
Scattering | Based on the talk given by B.Z.K. at the Workshop QCD'2000,
Villefranche-sur-Mer, January 3-7, 2000. Two references and few comments are
added | Phys.Rev.Lett. 85 (2000) 507-510 | 10.1103/PhysRevLett.85.507 | null | hep-ph nucl-th | null | The energy dependence of the total hadronic cross sections is caused by gluon
bremsstrahlung which we treat nonperturbatively. It is located at small
transverse distances about 0.3 fm from the valence quarks. The cross section of
gluon radiation is predicted to exponentiate and rise with energy as s^{\Delta}
with \Delta=0.17 +/- 0.01. The total cross section also includes a large energy
independent Born term which corresponds to no gluon radiation. The calculated
total cross section and the slope of elastic scattering are in good agreement
with the data.
| [
{
"created": "Wed, 23 Feb 2000 13:43:44 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Feb 2000 12:34:11 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Feb 2000 09:59:06 GMT",
"version": "v3"
},
{
"created": "Sat, 1 Apr 2000 13:43:24 GMT",
"version": "v4"
},
{
"created": "Sat, 20 May 2000 18:35:48 GMT",
"version": "v5"
}
] | 2009-10-31 | [
[
"Kopeliovich",
"B. Z.",
""
],
[
"Potashnikova",
"I. K.",
""
],
[
"Povh",
"B.",
""
],
[
"Predazzi",
"E.",
""
]
] | The energy dependence of the total hadronic cross sections is caused by gluon bremsstrahlung which we treat nonperturbatively. It is located at small transverse distances about 0.3 fm from the valence quarks. The cross section of gluon radiation is predicted to exponentiate and rise with energy as s^{\Delta} with \Delta=0.17 +/- 0.01. The total cross section also includes a large energy independent Born term which corresponds to no gluon radiation. The calculated total cross section and the slope of elastic scattering are in good agreement with the data. |
0905.2687 | Clark Downum | Frank Close, Clark Downum | On the possibility of Deeply Bound Hadronic Molecules from single Pion
Exchange | 5 pages, 1 figure. Version accepted to PRL. Equation 3 of v1 of this
paper was wrong and has been taken into account in this version. Other minor
typos corrected... conclusions unchanged | Phys.Rev.Lett.102:242003,2009 | 10.1103/PhysRevLett.102.242003 | OUTP-09-09 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Pion exchange in S-wave between hadrons that are themselves in a relative
S-wave can shift energies by hundreds of MeV. In the case of charmed mesons
$D,D^*,D_0,D_1$ a spectroscopy of quasi-molecular states may arise consistent
with enigmatic charmonium states observed above 4 GeV in $e^+e^-$ annihilation.
A possible explanation of $Y(4260)\to \psi\pi\pi$ and $Y(4360) \to \psi'\pi\pi$
is found. Searches in $D\bar{D}3\pi$ channels as well as B decays are
recommended to test this hypothesis.
| [
{
"created": "Sat, 16 May 2009 14:43:21 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jun 2009 08:50:04 GMT",
"version": "v2"
}
] | 2009-07-22 | [
[
"Close",
"Frank",
""
],
[
"Downum",
"Clark",
""
]
] | Pion exchange in S-wave between hadrons that are themselves in a relative S-wave can shift energies by hundreds of MeV. In the case of charmed mesons $D,D^*,D_0,D_1$ a spectroscopy of quasi-molecular states may arise consistent with enigmatic charmonium states observed above 4 GeV in $e^+e^-$ annihilation. A possible explanation of $Y(4260)\to \psi\pi\pi$ and $Y(4360) \to \psi'\pi\pi$ is found. Searches in $D\bar{D}3\pi$ channels as well as B decays are recommended to test this hypothesis. |
2403.13087 | Hua-Yu Jiang | Su-Ping Jin and Hua-Yu Jiang | An improved calculation of the $D_{(s)}^*D_{(s)}V$ and
$B_{(s)}^*B_{(s)}V$ couplings from light-cone sum rules | 46 pages, 4 figures, 13 tables | Eur.Phys.J.C 84 (2024) 6, 598 | 10.1140/epjc/s10052-024-12867-7 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an improved calculation of the $D_{(s)}^*D_{(s)}V$ and
$B_{(s)}^*B_{(s)}V$ coupling constants, where $V$ denotes $\rho$, $K^\ast$,
$\omega$, and $\phi$ meson. These couplings govern the QCD long-distance
dynamics in interactions between heavy pseudoscalar/vector mesons and light
vector mesons. Our analysis is conducted within the framework of QCD light-cone
sum rules (LCSRs) by utilizing the light-cone distribution amplitudes (LCDAs)
of light vector mesons. By systematically incorporating the subleading power
corrections and higher-twist contributions at leading order (LO) and including
the next-to-leading order (NLO) corrections at leading power, we achieve
enhanced accuracy in the light-cone operator product expansion (OPE) for the
underlying correlation function. In assessing the reliability of the
established LCSRs, we consider uncertainties arising from the choice of the
quark-hadron duality region in the double dispersion relation. Building upon
these improvements, we accomplish an optimized computation and analysis for the
strong coupling constants $g_{H^\ast HV}$ which are used to extract the
effective coupling $\lambda$ in the heavy meson chiral perturbation theory
(HM$\chi$PT). Furthermore, we investigate the $SU(3)$ flavour symmetry breaking
effects in detail and compare our sum rule calculations with previous studies
in an exploratory way.
| [
{
"created": "Tue, 19 Mar 2024 18:34:21 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jul 2024 12:22:50 GMT",
"version": "v2"
}
] | 2024-07-11 | [
[
"Jin",
"Su-Ping",
""
],
[
"Jiang",
"Hua-Yu",
""
]
] | We present an improved calculation of the $D_{(s)}^*D_{(s)}V$ and $B_{(s)}^*B_{(s)}V$ coupling constants, where $V$ denotes $\rho$, $K^\ast$, $\omega$, and $\phi$ meson. These couplings govern the QCD long-distance dynamics in interactions between heavy pseudoscalar/vector mesons and light vector mesons. Our analysis is conducted within the framework of QCD light-cone sum rules (LCSRs) by utilizing the light-cone distribution amplitudes (LCDAs) of light vector mesons. By systematically incorporating the subleading power corrections and higher-twist contributions at leading order (LO) and including the next-to-leading order (NLO) corrections at leading power, we achieve enhanced accuracy in the light-cone operator product expansion (OPE) for the underlying correlation function. In assessing the reliability of the established LCSRs, we consider uncertainties arising from the choice of the quark-hadron duality region in the double dispersion relation. Building upon these improvements, we accomplish an optimized computation and analysis for the strong coupling constants $g_{H^\ast HV}$ which are used to extract the effective coupling $\lambda$ in the heavy meson chiral perturbation theory (HM$\chi$PT). Furthermore, we investigate the $SU(3)$ flavour symmetry breaking effects in detail and compare our sum rule calculations with previous studies in an exploratory way. |
2109.09235 | Jong-Ping Hsu | Jong-Ping Hsu and Leonardo Hsu | Dark Matter, Cosmic Positrons in Alpha Magnetic Spectrometer Experiment
and Particle-Cosmology with Yang-Mills Gravity | 25 pages | Chinese Journal of Physics, 2021 | 10.1016/j.cjph.2021.08.008 | null | hep-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a model of dark matter consisting of high energy
anti-electron-neutrinos with leptonic force, which is produced by the conserved
leptonic charge $g_\ell$ associated with Lee-Yang's $U_1$ gauge symmetry. Based
on particle-cosmology for early universe, the high energy neutrino (HEN) model
of dark matter assumes that the neutron decay processes, $n\to p^+ + e^-
+\ov{\nu}_e$, dominate the epoch after the creation, collision and confinement
processes of quarks and antiquarks in the beginning. The HEN model implies the
following results: There are almost equal numbers of electrons, protons and
anti-electron-neutrinos dominated the matter cosmos. There are unobservable and
ubiquitous anti-electron-neutrinos $\ov{\nu}_e$ with leptonic charge $g_\ell$
in the universe. Although the total mass of anti-electron-neutrino dark matter
is negligible in the universe, its enhanced gravitational and leptonic forces
could lead to the observed flat rotation curves due to relativistic
$\ov{\nu}_e$, whose static force involves a factor $E_\nu/m_\nu\approx 10^6$.
We estimate the leptonic charge to be $g_\ell \approx 7 \times 10^{-21}$. The
model predicts that the anti-electron-neutrino dark matter can interact with
cosmic-ray protons to produce positrons, i.e. $\ov{\nu}_e + p^+ \to e^+ +n$,
through weak interaction of the unified electroweak theory. The
anti-electron-neutrino dark matter sheds light on the Alpha Magnetic
Spectrometer (AMS) experiment, which has detected the intriguing excess of
cosmic-ray positrons over what is expected. The HEN model of dark matter
suggests an experimental test of the new Lee-Yang force between electrons by
using modern precision Cavendish experiment.
| [
{
"created": "Sun, 19 Sep 2021 21:58:51 GMT",
"version": "v1"
}
] | 2021-09-21 | [
[
"Hsu",
"Jong-Ping",
""
],
[
"Hsu",
"Leonardo",
""
]
] | We discuss a model of dark matter consisting of high energy anti-electron-neutrinos with leptonic force, which is produced by the conserved leptonic charge $g_\ell$ associated with Lee-Yang's $U_1$ gauge symmetry. Based on particle-cosmology for early universe, the high energy neutrino (HEN) model of dark matter assumes that the neutron decay processes, $n\to p^+ + e^- +\ov{\nu}_e$, dominate the epoch after the creation, collision and confinement processes of quarks and antiquarks in the beginning. The HEN model implies the following results: There are almost equal numbers of electrons, protons and anti-electron-neutrinos dominated the matter cosmos. There are unobservable and ubiquitous anti-electron-neutrinos $\ov{\nu}_e$ with leptonic charge $g_\ell$ in the universe. Although the total mass of anti-electron-neutrino dark matter is negligible in the universe, its enhanced gravitational and leptonic forces could lead to the observed flat rotation curves due to relativistic $\ov{\nu}_e$, whose static force involves a factor $E_\nu/m_\nu\approx 10^6$. We estimate the leptonic charge to be $g_\ell \approx 7 \times 10^{-21}$. The model predicts that the anti-electron-neutrino dark matter can interact with cosmic-ray protons to produce positrons, i.e. $\ov{\nu}_e + p^+ \to e^+ +n$, through weak interaction of the unified electroweak theory. The anti-electron-neutrino dark matter sheds light on the Alpha Magnetic Spectrometer (AMS) experiment, which has detected the intriguing excess of cosmic-ray positrons over what is expected. The HEN model of dark matter suggests an experimental test of the new Lee-Yang force between electrons by using modern precision Cavendish experiment. |
1303.6574 | Alexander Silenko | Alexander J. Silenko | Quantum-mechanical description of spin-1 particles with electric dipole
moments | 10 pages | Physical Review D 87, 073015 (2013) | 10.1103/PhysRevD.87.073015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Proca-Corben-Schwinger equations for a spin-1 particle with an anomalous
magnetic moment are added by a term describing an electric dipole moment, then
they are reduced to a Hamiltonian form, and finally they are brought to the
Foldy-Wouthuysen representation. Relativistic equations of motion are derived.
The needed agreement between quantum-mechanical and classical relativistic
equations of motion is proved. The scalar and tensor electric and magnetic
polarizabilities of pointlike spin-1 particles (W bosons) are calculated for
the first time.
| [
{
"created": "Tue, 26 Mar 2013 17:58:24 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Apr 2013 06:42:03 GMT",
"version": "v2"
}
] | 2013-04-26 | [
[
"Silenko",
"Alexander J.",
""
]
] | The Proca-Corben-Schwinger equations for a spin-1 particle with an anomalous magnetic moment are added by a term describing an electric dipole moment, then they are reduced to a Hamiltonian form, and finally they are brought to the Foldy-Wouthuysen representation. Relativistic equations of motion are derived. The needed agreement between quantum-mechanical and classical relativistic equations of motion is proved. The scalar and tensor electric and magnetic polarizabilities of pointlike spin-1 particles (W bosons) are calculated for the first time. |
hep-ph/0204290 | Matthias Steinhauser | A.A. Penin and M. Steinhauser | Heavy Quarkonium Spectrum at ${\cal O}(\alpha_s^5m_q)$ and Bottom/Top
Quark Mass Determination | 16 pages, result based on upsilon expansion revised, version to
appear in Phys. Lett. B | Phys.Lett.B538:335-345,2002 | 10.1016/S0370-2693(02)02040-3 | DESY 02-043 | hep-ph | null | We present the next-to-next-to-next-to-leading ${\cal O}(\alpha_s^5m_q)$
result for the ground state energy of a heavy quarkonium system. On the basis
of this result we determine the bottom quark mass from $\Upsilon(1S)$ resonance
and provide an explicit formula relating the top quark mass to the resonance
energy in $t\bar t$ threshold production.
| [
{
"created": "Thu, 25 Apr 2002 08:05:10 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jun 2002 11:46:24 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Penin",
"A. A.",
""
],
[
"Steinhauser",
"M.",
""
]
] | We present the next-to-next-to-next-to-leading ${\cal O}(\alpha_s^5m_q)$ result for the ground state energy of a heavy quarkonium system. On the basis of this result we determine the bottom quark mass from $\Upsilon(1S)$ resonance and provide an explicit formula relating the top quark mass to the resonance energy in $t\bar t$ threshold production. |
1607.06572 | Hee-Jung Lee | Chang Ho Hyun, Hyun-Chul Kim, Hee-Jung Lee | Parity-violating $\pi NN$ coupling constant from the flavor-conserving
effective weak chiral Lagrangian | 12 pages | null | 10.1016/j.physletb.2017.02.039 | INHA-NTG-03/2016 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the parity-violating pion-nucleon-nucleon coupling constant
$h^1_{\pi NN}$, based on the chiral quark-soliton model. We employ an effective
weak Hamiltonian that takes into account the next-to-leading order corrections
from QCD to the weak interactions at the quark level. Using the gradient
expansion, we derive the leading-order effective weak chiral Lagrangian with
the low-energy constants determined. The effective weak chiral Lagrangian is
incorporated in the chiral quark-soliton model to calculate the
parity-violating $\pi NN$ constant $h^1_{\pi NN}$. We obtain a value of about
$10^{-7}$ at the leading order. The corrections from the next-to-leading order
reduce the leading order result by about 20~\%.
| [
{
"created": "Fri, 22 Jul 2016 06:43:50 GMT",
"version": "v1"
}
] | 2017-03-01 | [
[
"Hyun",
"Chang Ho",
""
],
[
"Kim",
"Hyun-Chul",
""
],
[
"Lee",
"Hee-Jung",
""
]
] | We investigate the parity-violating pion-nucleon-nucleon coupling constant $h^1_{\pi NN}$, based on the chiral quark-soliton model. We employ an effective weak Hamiltonian that takes into account the next-to-leading order corrections from QCD to the weak interactions at the quark level. Using the gradient expansion, we derive the leading-order effective weak chiral Lagrangian with the low-energy constants determined. The effective weak chiral Lagrangian is incorporated in the chiral quark-soliton model to calculate the parity-violating $\pi NN$ constant $h^1_{\pi NN}$. We obtain a value of about $10^{-7}$ at the leading order. The corrections from the next-to-leading order reduce the leading order result by about 20~\%. |
hep-ph/9308363 | Nathan Seiberg | Philippe Pouliot and Nathan Seiberg | (S)quark Masses and Non-Abelian Horizontal Symmetries | 9 pages, RU-93-39 | Phys.Lett.B318:169-173,1993 | 10.1016/0370-2693(93)91801-S | null | hep-ph | null | We present a model of quark and squark masses which is based on a non-Abelian
horizontal symmetry. It leads to order of magnitude relations between quark
mass ratios and mixing angles and to the successful exact relation $\sin
\theta_C=\sqrt {m_d\over m_s}$ to better than $20\%$ accuracy. The non-Abelian
symmetry also ensures the necessary squark degeneracy to suppress FCNC mediated
by loops with squarks and gluinos, in the neutral meson systems.
| [
{
"created": "Mon, 30 Aug 1993 18:18:39 GMT",
"version": "v1"
}
] | 2009-09-15 | [
[
"Pouliot",
"Philippe",
""
],
[
"Seiberg",
"Nathan",
""
]
] | We present a model of quark and squark masses which is based on a non-Abelian horizontal symmetry. It leads to order of magnitude relations between quark mass ratios and mixing angles and to the successful exact relation $\sin \theta_C=\sqrt {m_d\over m_s}$ to better than $20\%$ accuracy. The non-Abelian symmetry also ensures the necessary squark degeneracy to suppress FCNC mediated by loops with squarks and gluinos, in the neutral meson systems. |
0901.3660 | Mikhail Braun | M.A.Braun | Pomeron loops in the perturbative QCD with Large N_c | 17 pages, 2 figures | Eur.Phys.J.C63:287-296,2009 | 10.1140/epjc/s10052-009-1102-3 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The lowest order pomeron loop is calculated for the leading conformal weight
with full dependence of the triple pomeron vertex on intermediate conformal
weights. The loop is found to be convergent. Its contribution to the pomeron
Green function begins to dominate already at rapidities 10$\div$15. The pomeron
pole renormalization is found to be quite small due to a rapid fall of the
triple pomeron vertex with rising conformal weights.
| [
{
"created": "Fri, 23 Jan 2009 11:42:11 GMT",
"version": "v1"
}
] | 2010-04-21 | [
[
"Braun",
"M. A.",
""
]
] | The lowest order pomeron loop is calculated for the leading conformal weight with full dependence of the triple pomeron vertex on intermediate conformal weights. The loop is found to be convergent. Its contribution to the pomeron Green function begins to dominate already at rapidities 10$\div$15. The pomeron pole renormalization is found to be quite small due to a rapid fall of the triple pomeron vertex with rising conformal weights. |
1005.0841 | Sakura Schafer-Nameki | Sakura Schafer-Nameki, Carlos Tamarit, Gonzalo Torroba | A Hybrid Higgs | 56 pages, 7 figures, v2: discussion on FCNCs and references added,
v3: JHEP version | JHEP 1103:113,2011 | 10.1007/JHEP03(2011)113 | SLAC-PUB-14088, NSF-KITP-10-054 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct composite Higgs models admitting a weakly coupled Seiberg dual
description. We focus on the possibility that only the up-type Higgs is an
elementary field, while the down-type Higgs arises as a composite hadron. The
model, based on a confining SQCD theory, breaks supersymmetry and electroweak
symmetry dynamically and calculably. This simultaneously solves the \mu/B_\mu
problem and explains the smallness of the bottom and tau masses compared to the
top mass. The proposal is then applied to a class of models where the same
confining dynamics is used to generate the Standard Model flavor hierarchy by
quark and lepton compositeness. This provides a unified framework for flavor,
supersymmetry breaking and electroweak physics. The weakly coupled dual is used
to explicitly compute the MSSM parameters in terms of a few microscopic
couplings, giving interesting relations between the electroweak and soft
parameters. The RG evolution down to the TeV scale is obtained and salient
phenomenological predictions of this class of "single-sector" models are
discussed.
| [
{
"created": "Wed, 5 May 2010 20:00:03 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Jun 2010 22:25:22 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Apr 2011 22:49:57 GMT",
"version": "v3"
}
] | 2015-03-17 | [
[
"Schafer-Nameki",
"Sakura",
""
],
[
"Tamarit",
"Carlos",
""
],
[
"Torroba",
"Gonzalo",
""
]
] | We construct composite Higgs models admitting a weakly coupled Seiberg dual description. We focus on the possibility that only the up-type Higgs is an elementary field, while the down-type Higgs arises as a composite hadron. The model, based on a confining SQCD theory, breaks supersymmetry and electroweak symmetry dynamically and calculably. This simultaneously solves the \mu/B_\mu problem and explains the smallness of the bottom and tau masses compared to the top mass. The proposal is then applied to a class of models where the same confining dynamics is used to generate the Standard Model flavor hierarchy by quark and lepton compositeness. This provides a unified framework for flavor, supersymmetry breaking and electroweak physics. The weakly coupled dual is used to explicitly compute the MSSM parameters in terms of a few microscopic couplings, giving interesting relations between the electroweak and soft parameters. The RG evolution down to the TeV scale is obtained and salient phenomenological predictions of this class of "single-sector" models are discussed. |
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