id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2211.01906 | Peihong Gu | Su-Ping Chen, Pei-Hong Gu | $U(1)_{Y'}$ universal seesaw | 9 pages, 6 figures | null | 10.1016/j.nuclphysb.2022.116057 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the $SU(3)_c \times SU(2)_L \times U(1)_Y$ standard model by a
$U(1)_{Y'}$ gauge symmetry. Three right-handed neutrinos are introduced to
cancel the gauge anomaly. One Higgs singlet is responsible for spontaneously
breaking the $U(1)_{Y'}$ symmetry while the standard model Higgs doublet does
not carry any $U(1)_{Y'}$ charges. The down-type quarks, up-type quarks,
charged leptons and neutral neutrinos obtain their Dirac masses through four
types of dimension-5 operators constructed by the fermion doublets and singlets
with the Higgs doublet and singlet. This effective theory is realized in three
renormalizable contexts with heavy fermion singlets, scalar doublets and
fermion doublets. The heavy fermion singlets and doublets for generating the
neutrino masses also accommodate a successful Dirac leptogenesis to explain the
baryon asymmetry in the universe.
| [
{
"created": "Thu, 3 Nov 2022 15:39:31 GMT",
"version": "v1"
}
] | 2023-01-11 | [
[
"Chen",
"Su-Ping",
""
],
[
"Gu",
"Pei-Hong",
""
]
] | We extend the $SU(3)_c \times SU(2)_L \times U(1)_Y$ standard model by a $U(1)_{Y'}$ gauge symmetry. Three right-handed neutrinos are introduced to cancel the gauge anomaly. One Higgs singlet is responsible for spontaneously breaking the $U(1)_{Y'}$ symmetry while the standard model Higgs doublet does not carry any $U(1)_{Y'}$ charges. The down-type quarks, up-type quarks, charged leptons and neutral neutrinos obtain their Dirac masses through four types of dimension-5 operators constructed by the fermion doublets and singlets with the Higgs doublet and singlet. This effective theory is realized in three renormalizable contexts with heavy fermion singlets, scalar doublets and fermion doublets. The heavy fermion singlets and doublets for generating the neutrino masses also accommodate a successful Dirac leptogenesis to explain the baryon asymmetry in the universe. |
1510.03092 | Nobuchika Okada | Jason Carson and Nobuchika Okada | 125 GeV Higgs boson mass from 5D gauge-Higgs unification | 28 pages, 8 figures, revised version to be published in PTEP | Prog Theor Exp Phys (2018) | 10.1093/ptep/pty018 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of a simple gauge-Higgs unification (GHU) scenario based on
the gauge group SU(3)$\times$U(1)$^\prime$ in a 5-dimensional flat space-time,
we investigate a possibility to reproduce the observed Higgs boson mass of
around 125 GeV. We introduce bulk fermion multiplets with a bulk mass and a
(half) periodic boundary condition. In our analysis, we adopt a low energy
effective theoretical approach of the GHU scenario, where the running Higgs
quartic coupling is required to vanish at the compactification scale. Under
this "gauge-Higgs condition," we investigate the renormalization group
evolution of the Higgs quartic coupling and find a relation between the bulk
mass and the compactification scale so as to reproduce the 125 GeV Higgs boson
mass. Through quantum corrections at the one-loop level, the bulk fermions
contribute to the Higgs boson production and decay processes and deviate the
Higgs boson signal strengths at the Large Hadron Collider (LHC) experiments
from the Standard Model (SM) predictions. Employing the current experimental
data which show the the Higgs boson signal strengths for a variety of Higgs
decay modes are consistent with the SM predictions, we obtain lower mass bounds
on the lightest mode of the bulk fermions.
| [
{
"created": "Sun, 11 Oct 2015 20:07:19 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jul 2017 15:04:39 GMT",
"version": "v2"
},
{
"created": "Mon, 5 Feb 2018 01:59:09 GMT",
"version": "v3"
}
] | 2019-12-06 | [
[
"Carson",
"Jason",
""
],
[
"Okada",
"Nobuchika",
""
]
] | In the context of a simple gauge-Higgs unification (GHU) scenario based on the gauge group SU(3)$\times$U(1)$^\prime$ in a 5-dimensional flat space-time, we investigate a possibility to reproduce the observed Higgs boson mass of around 125 GeV. We introduce bulk fermion multiplets with a bulk mass and a (half) periodic boundary condition. In our analysis, we adopt a low energy effective theoretical approach of the GHU scenario, where the running Higgs quartic coupling is required to vanish at the compactification scale. Under this "gauge-Higgs condition," we investigate the renormalization group evolution of the Higgs quartic coupling and find a relation between the bulk mass and the compactification scale so as to reproduce the 125 GeV Higgs boson mass. Through quantum corrections at the one-loop level, the bulk fermions contribute to the Higgs boson production and decay processes and deviate the Higgs boson signal strengths at the Large Hadron Collider (LHC) experiments from the Standard Model (SM) predictions. Employing the current experimental data which show the the Higgs boson signal strengths for a variety of Higgs decay modes are consistent with the SM predictions, we obtain lower mass bounds on the lightest mode of the bulk fermions. |
0705.4667 | Daniele Montanino dr. | A. Mirizzi (MPI), D. Montanino (Salento U. & INFN, Lecce), P.D.
Serpico (Fermilab) | Revisiting cosmological bounds on radiative neutrino lifetime | 7 pages, 3 figures. Minor changes in the text, few references added.
Matches the published version | Phys.Rev.D76:053007,2007 | 10.1103/PhysRevD.76.053007 | FERMILAB-PUB-07-135-A; MPP-2007-63 | hep-ph astro-ph | null | Neutrino oscillation experiments and direct bounds on absolute masses
constrain neutrino mass differences to fall into the microwave energy range,
for most of the allowed parameter space. As a consequence of these recent
phenomenological advances, older constraints on radiative neutrino decays based
on diffuse background radiations and assuming strongly hierarchical masses in
the eV range are now outdated. We thus derive new bounds on the radiative
neutrino lifetime using the high precision cosmic microwave background spectral
data collected by the Far Infrared Absolute Spectrophotometer instrument on
board of Cosmic Background Explorer. The lower bound on the lifetime is between
a few x 10^19 s and 5 x 10^20 s, depending on the neutrino mass ordering and on
the absolute mass scale. However, due to phase space limitations, the upper
bound in terms of the effective magnetic moment mediating the decay is not
better than ~ 10^-8 Bohr magnetons. We also comment about possible improvements
of these limits, by means of recent diffuse infrared photon background data. We
compare these bounds with pre-existing limits coming from laboratory or
astrophysical arguments. We emphasize the complementarity of our results with
others available in the literature.
| [
{
"created": "Thu, 31 May 2007 18:05:34 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Sep 2007 17:22:02 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Mirizzi",
"A.",
"",
"MPI"
],
[
"Montanino",
"D.",
"",
"Salento U. & INFN, Lecce"
],
[
"Serpico",
"P. D.",
"",
"Fermilab"
]
] | Neutrino oscillation experiments and direct bounds on absolute masses constrain neutrino mass differences to fall into the microwave energy range, for most of the allowed parameter space. As a consequence of these recent phenomenological advances, older constraints on radiative neutrino decays based on diffuse background radiations and assuming strongly hierarchical masses in the eV range are now outdated. We thus derive new bounds on the radiative neutrino lifetime using the high precision cosmic microwave background spectral data collected by the Far Infrared Absolute Spectrophotometer instrument on board of Cosmic Background Explorer. The lower bound on the lifetime is between a few x 10^19 s and 5 x 10^20 s, depending on the neutrino mass ordering and on the absolute mass scale. However, due to phase space limitations, the upper bound in terms of the effective magnetic moment mediating the decay is not better than ~ 10^-8 Bohr magnetons. We also comment about possible improvements of these limits, by means of recent diffuse infrared photon background data. We compare these bounds with pre-existing limits coming from laboratory or astrophysical arguments. We emphasize the complementarity of our results with others available in the literature. |
hep-ph/9608335 | Shoichi Sasaki Rcnp | Hideo Suganuma (RCNP), Hiroko Ichie (RCNP), Hiroshi Toki (RCNP),
Hideko Monden (TMU) | Recent Progress in Nonperturbative QCD Theory and Insight on
Cosmological Phase Transition | Talk presented by H. Suganuma at International Workshop on ``Nuclear
and Particle Cosmo Physics'', Jan. 1996, in Atami, Japan, 10 pages, Plain
Tex, uses PHYZZX ( 9 figures - available on request from
suganuma@rcnp.osaka-u.ac.jp ) | null | null | null | hep-ph | null | The QCD phase transition at finite temperature is studied with the dual
Ginzburg-Landau theory, which is the QCD effective theory based on the dual
Higgs mechanism by QCD-monopole condensation. At high temperature, the
confinement force is largely reduced by thermal effects, which leads to the
swelling of hadrons. Simple formulae for the surface tension and the thickness
of the phase boundary are derived from the shape of the effective potential at
the critical temperature. We investigate also the process of the hadron-bubble
formation in the early Universe.
| [
{
"created": "Thu, 15 Aug 1996 15:14:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Suganuma",
"Hideo",
"",
"RCNP"
],
[
"Ichie",
"Hiroko",
"",
"RCNP"
],
[
"Toki",
"Hiroshi",
"",
"RCNP"
],
[
"Monden",
"Hideko",
"",
"TMU"
]
] | The QCD phase transition at finite temperature is studied with the dual Ginzburg-Landau theory, which is the QCD effective theory based on the dual Higgs mechanism by QCD-monopole condensation. At high temperature, the confinement force is largely reduced by thermal effects, which leads to the swelling of hadrons. Simple formulae for the surface tension and the thickness of the phase boundary are derived from the shape of the effective potential at the critical temperature. We investigate also the process of the hadron-bubble formation in the early Universe. |
hep-ph/9711324 | Jean Letessier | Jean Letessier, Jan Rafelski, Ahmed Tounsi | Formation and Evolution of the Quark-Gluon Plasma | Replaced for bad printing on US paper. 16 pages, LaTeX, 3 postscript
figures | Phys.Lett. B333 (1994) 484-493 | 10.1016/0370-2693(94)90172-4 | null | hep-ph nucl-th | null | Imposing an equilibrium between the thermal pressure of deconfined quarks and
gluons and the dynamical compression pressure exercised by in-flowing nuclear
matter, we study the initial thermal conditions reached in a quark-gluon plasma
fireball formed in a relativistic heavy ion collision. We show that entropy is
produced primarily in the pre-equilibrium stage of the reaction. We test our
approach, comparing our results with the S-W/Pb collision results at 200 GeV A
and find a surprising degree of agreement assuming about 50% stopping. We apply
our method to a determination of the conditions in collisions of Au-Au at 11
GeV A and Pb-Pb at 157 GeV A, assuming full stopping of momentum, energy and
baryon number. Our detailed results directly determine the spectral shape and
abundance of (strange) hadrons and electromagnetic probes (photons, dileptons)
produced in the collision, and we explore specific experimental consequences.
| [
{
"created": "Thu, 13 Nov 1997 18:01:34 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Nov 1997 10:59:47 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Letessier",
"Jean",
""
],
[
"Rafelski",
"Jan",
""
],
[
"Tounsi",
"Ahmed",
""
]
] | Imposing an equilibrium between the thermal pressure of deconfined quarks and gluons and the dynamical compression pressure exercised by in-flowing nuclear matter, we study the initial thermal conditions reached in a quark-gluon plasma fireball formed in a relativistic heavy ion collision. We show that entropy is produced primarily in the pre-equilibrium stage of the reaction. We test our approach, comparing our results with the S-W/Pb collision results at 200 GeV A and find a surprising degree of agreement assuming about 50% stopping. We apply our method to a determination of the conditions in collisions of Au-Au at 11 GeV A and Pb-Pb at 157 GeV A, assuming full stopping of momentum, energy and baryon number. Our detailed results directly determine the spectral shape and abundance of (strange) hadrons and electromagnetic probes (photons, dileptons) produced in the collision, and we explore specific experimental consequences. |
1505.06369 | Yaofu Zhou | Yaofu Zhou | Constraining the Higgs Boson Coupling to Light Quarks in the $H\to ZZ$
Final States | 7 pages, 5 figures, 3 tables | Phys. Rev. D 93, 013019 (2016) | 10.1103/PhysRevD.93.013019 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We constrain the Higgs boson (Yukawa) coupling to quarks in the first two
generations in the $H\to ZZ$ final states. Deviation of these couplings from
the Standard Model values leads to change in the Higgs boson width and in the
cross sections of relevant processes. In the Higgs boson resonance region, an
increased light Yukawa coupling leads to an increased Higgs boson width, which
in turn leads to a decreased cross section. In the off-shell region, increased
Yukawa couplings result in an enhancement of the Higgs boson signal through
$q\bar{q}$ annihilation. With the assumption of scaling one Yukawa coupling at
a time, this study is conceptually simple and yields results with the same
order of magnitude as the tightest in the literature. The study is based on
results published by the CMS experiment at the LHC in 2014, corresponding to
integrated luminosities of $5.1\ifb$ at a centre-of-mass energy
$\sqrt{s}=7\tev$ and $19.7\ifb$ at $8\tev$.
| [
{
"created": "Sat, 23 May 2015 19:37:02 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Feb 2016 00:22:20 GMT",
"version": "v2"
}
] | 2016-02-16 | [
[
"Zhou",
"Yaofu",
""
]
] | We constrain the Higgs boson (Yukawa) coupling to quarks in the first two generations in the $H\to ZZ$ final states. Deviation of these couplings from the Standard Model values leads to change in the Higgs boson width and in the cross sections of relevant processes. In the Higgs boson resonance region, an increased light Yukawa coupling leads to an increased Higgs boson width, which in turn leads to a decreased cross section. In the off-shell region, increased Yukawa couplings result in an enhancement of the Higgs boson signal through $q\bar{q}$ annihilation. With the assumption of scaling one Yukawa coupling at a time, this study is conceptually simple and yields results with the same order of magnitude as the tightest in the literature. The study is based on results published by the CMS experiment at the LHC in 2014, corresponding to integrated luminosities of $5.1\ifb$ at a centre-of-mass energy $\sqrt{s}=7\tev$ and $19.7\ifb$ at $8\tev$. |
1510.08069 | Nikita Blinov | Nikita Blinov, Jonathan Kozaczuk, David E. Morrissey, Alejandro de la
Puente | Compressing the Inert Doublet Model | 32 pages, 9 figures. References added; other minor changes to match
journal version | Phys. Rev. D 93, 035020 (2016) | 10.1103/PhysRevD.93.035020 | SLAC-PUB-16419 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Inert Doublet Model relies on a discrete symmetry to prevent couplings of
the new scalars to Standard Model fermions. This stabilizes the lightest inert
state, which can then contribute to the observed dark matter density. In the
presence of additional approximate symmetries, the resulting spectrum of exotic
scalars can be compressed. Here, we study the phenomenological and cosmological
implications of this scenario. We derive new limits on the compressed Inert
Doublet Model from LEP, and outline the prospects for exclusion and discovery
of this model at dark matter experiments, the LHC, and future colliders.
| [
{
"created": "Tue, 27 Oct 2015 20:09:07 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Feb 2016 19:06:17 GMT",
"version": "v2"
}
] | 2016-02-24 | [
[
"Blinov",
"Nikita",
""
],
[
"Kozaczuk",
"Jonathan",
""
],
[
"Morrissey",
"David E.",
""
],
[
"de la Puente",
"Alejandro",
""
]
] | The Inert Doublet Model relies on a discrete symmetry to prevent couplings of the new scalars to Standard Model fermions. This stabilizes the lightest inert state, which can then contribute to the observed dark matter density. In the presence of additional approximate symmetries, the resulting spectrum of exotic scalars can be compressed. Here, we study the phenomenological and cosmological implications of this scenario. We derive new limits on the compressed Inert Doublet Model from LEP, and outline the prospects for exclusion and discovery of this model at dark matter experiments, the LHC, and future colliders. |
hep-ph/0204100 | Junji Hisano | J. Hisano | Probing physics beyond the standard model from lepton sector | ICRR-Report-487-2002-5, 10 pages;Talk given in The Fifth KEK Topical
Conference (KEKTC5), KEK, Tsukuba, Japan, November 2001 | Nucl.Phys.Proc.Suppl. 111 (2002) 178-187 | 10.1016/S0920-5632(02)01703-6 | null | hep-ph | null | In this review we discuss physics of the lepton sector, the anomalous dipole
moment of muon, the charged lepton-flavor violation, and the electric dipole
moments of charged leptons, from viewpoints of the minimal supersymmetric
standard model and the extensions.
| [
{
"created": "Tue, 9 Apr 2002 08:28:11 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Hisano",
"J.",
""
]
] | In this review we discuss physics of the lepton sector, the anomalous dipole moment of muon, the charged lepton-flavor violation, and the electric dipole moments of charged leptons, from viewpoints of the minimal supersymmetric standard model and the extensions. |
2407.10560 | Yannis Georis | J. de Vries, M. Drewes, Y. Georis, J. Klari\'c, V. Plakkot | Confronting the low-scale seesaw and leptogenesis with neutrinoless
double beta decay | 27 pages, 10 figures | null | null | null | hep-ph astro-ph.CO nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the impact of heavy neutrinos with masses in the MeV-GeV range on
neutrinoless double beta decay ($0\nu\beta\beta$) in view of updated results
for the lifetime of this process. Working in a minimal realistic extension of
the Standard Model by two right-handed neutrino flavours, we show that the
non-observation of $0\nu\beta\beta$ will impose strong bounds on the heavy
neutrino properties that are complementary to the limits obtained from Big Bang
Nucleosynthesis and collider searches. For an inverted mass hierarchy of the
light neutrinos we find that improved limits on $0\nu\beta\beta$ from
next-generation experiments will restrict the allowed parameter space for fixed
mass splitting to narrow bands in the mass-mixing plane. Further combining this
with the requirement to explain the baryon asymmetry of the universe via
leptogenesis reduces these bands to windows in parameter space that are
constrained in all directions and can be targeted by direct searches at
accelerators. For a normal mass hierarchy, only parts of the parameter space
can be probed by such experiments.
| [
{
"created": "Mon, 15 Jul 2024 09:20:00 GMT",
"version": "v1"
}
] | 2024-07-16 | [
[
"de Vries",
"J.",
""
],
[
"Drewes",
"M.",
""
],
[
"Georis",
"Y.",
""
],
[
"Klarić",
"J.",
""
],
[
"Plakkot",
"V.",
""
]
] | We revisit the impact of heavy neutrinos with masses in the MeV-GeV range on neutrinoless double beta decay ($0\nu\beta\beta$) in view of updated results for the lifetime of this process. Working in a minimal realistic extension of the Standard Model by two right-handed neutrino flavours, we show that the non-observation of $0\nu\beta\beta$ will impose strong bounds on the heavy neutrino properties that are complementary to the limits obtained from Big Bang Nucleosynthesis and collider searches. For an inverted mass hierarchy of the light neutrinos we find that improved limits on $0\nu\beta\beta$ from next-generation experiments will restrict the allowed parameter space for fixed mass splitting to narrow bands in the mass-mixing plane. Further combining this with the requirement to explain the baryon asymmetry of the universe via leptogenesis reduces these bands to windows in parameter space that are constrained in all directions and can be targeted by direct searches at accelerators. For a normal mass hierarchy, only parts of the parameter space can be probed by such experiments. |
hep-ph/9910437 | Edward W. Kolb | Daniel J. H. Chung, Edward W. Kolb, Antonio Riotto, Igor I. Tkachev | Probing Planckian physics: resonant production of particles during
inflation and features in the primordial power spectrum | 19 pages, 11 eps figures | Phys.Rev. D62 (2000) 043508 | 10.1103/PhysRevD.62.043508 | FNAL-Pub-99/308-A; CERN-TH/99-302 | hep-ph astro-ph hep-th | null | The phenomenon of resonant production of particles {\it after} inflation has
received much attention in the past few years. In a new application of resonant
production of particles, we consider the effect of a resonance {\em during}
inflation. We show that if the inflaton is coupled to a massive particle,
resonant production of the particle during inflation modifies the evolution of
the inflaton, and may leave an imprint in the form of sharp features in the
primordial power spectrum. Precision measurements of microwave background
anisotropies and large-scale structure surveys could be sensitive to the
features, and probe the spectrum of particles as massive as the Planck scale.
| [
{
"created": "Thu, 21 Oct 1999 21:24:25 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Chung",
"Daniel J. H.",
""
],
[
"Kolb",
"Edward W.",
""
],
[
"Riotto",
"Antonio",
""
],
[
"Tkachev",
"Igor I.",
""
]
] | The phenomenon of resonant production of particles {\it after} inflation has received much attention in the past few years. In a new application of resonant production of particles, we consider the effect of a resonance {\em during} inflation. We show that if the inflaton is coupled to a massive particle, resonant production of the particle during inflation modifies the evolution of the inflaton, and may leave an imprint in the form of sharp features in the primordial power spectrum. Precision measurements of microwave background anisotropies and large-scale structure surveys could be sensitive to the features, and probe the spectrum of particles as massive as the Planck scale. |
1902.01984 | Sheng-Quan Wang | Sheng-Quan Wang, Stanley J. Brodsky, Xing-Gang Wu, Leonardo Di
Giustino | Thrust Distribution in Electron-Positron Annihilation using the
Principle of Maximum Conformality | 6 pages, 4 figures, v2: matches published version | Phys. Rev. D 99, 114020 (2019) | 10.1103/PhysRevD.99.114020 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a comprehensive and self-consistent analysis for the thrust
distribution by using the Principle of Maximum Conformality (PMC). By absorbing
all nonconformal terms into the running coupling using PMC via renormalization
group equation, the scale in the running coupling shows the correct physical
behavior and the correct number of active flavors is determined. The resulting
PMC predictions agree with the precise measurements for both the thrust
differential distributions and the thrust mean values. Moreover, we provide a
new remarkable way to determine the running of the coupling constant
$\alpha_s(Q^2)$ from the measurement of the jet distributions in
electron-positron annihilation at a single given value of the center-of-mass
energy $\sqrt{s}$.
| [
{
"created": "Wed, 6 Feb 2019 00:21:11 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jun 2019 23:50:54 GMT",
"version": "v2"
}
] | 2019-07-03 | [
[
"Wang",
"Sheng-Quan",
""
],
[
"Brodsky",
"Stanley J.",
""
],
[
"Wu",
"Xing-Gang",
""
],
[
"Di Giustino",
"Leonardo",
""
]
] | We present a comprehensive and self-consistent analysis for the thrust distribution by using the Principle of Maximum Conformality (PMC). By absorbing all nonconformal terms into the running coupling using PMC via renormalization group equation, the scale in the running coupling shows the correct physical behavior and the correct number of active flavors is determined. The resulting PMC predictions agree with the precise measurements for both the thrust differential distributions and the thrust mean values. Moreover, we provide a new remarkable way to determine the running of the coupling constant $\alpha_s(Q^2)$ from the measurement of the jet distributions in electron-positron annihilation at a single given value of the center-of-mass energy $\sqrt{s}$. |
hep-ph/9305284 | David Bowser-Chao | Duane A. Dicus and Wayne W. Repko | Photon neutrino scattering | 8 pages including figures; DOE-40200-014,CPP-14,MSUHEP 93/08.
Figures, one style file, and latex file available by anonymous ftp to
utaphy.ph.utexas.edu, in directory [anonymous.cpp-preprints.ggtonunu] | Phys.Rev. D48 (1993) 5106-5108 | 10.1103/PhysRevD.48.5106 | null | hep-ph | null | The cross section for photon neutrino scattering is calculated in the
standard model assuming that the neutrino is massless and that the center of
mass energy is small compared to any charged lepton mass. Although the
scattered photons can acquire a (parity violating) circular polarization of
order unity, the cross section in this limit is highly suppressed.
| [
{
"created": "Tue, 18 May 1993 20:29:34 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Dicus",
"Duane A.",
""
],
[
"Repko",
"Wayne W.",
""
]
] | The cross section for photon neutrino scattering is calculated in the standard model assuming that the neutrino is massless and that the center of mass energy is small compared to any charged lepton mass. Although the scattered photons can acquire a (parity violating) circular polarization of order unity, the cross section in this limit is highly suppressed. |
1903.09249 | Luciano Abreu | L. M. Abreu, E. B. S. Corr\^ea, C. A. Linhares and A. P. C.
Malbouisson | Finite-volume and magnetic effects on the phase structure of the
three-flavor Nambu--Jona-Lasinio model | 27 pages; 9 figures; accepted for publication in Phys. Rev. D | Phys. Rev. D 99, 076001 (2019) | 10.1103/PhysRevD.99.076001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we analyze the finite-volume and magnetic effects on the phase
structure of a generalized version of Nambu--Jona-Lasinio model with three
quark flavors. By making use of mean-field approximation and Schwinger's
proper-time method in a toroidal topology with antiperiodic conditions, we
investigate the gap equation solutions under the change of the size of
compactified coordinates, strength of magnetic field, temperature and chemical
potential. The 't Hooft interaction contributions are also evaluated. The
thermodynamic behavior is strongly affected by the combined effects of relevant
variables. The findings suggest that the broken phase is disfavored due to both
increasing of temperature and chemical potential, and the drop of the cubic
volume of size $L$, whereas it is stimulated with the augmentation of magnetic
field. In particular, the reduction of $L$ (remarkably at $L\approx 0.5 - 3
$~fm) engenders a reduction of the constituent masses for $u,d,s$-quarks
through a crossover phase transition to the their corresponding current quark
masses. On the other hand, the presence of a magnetic background generates
greater values constituent quark masses, inducing smaller sizes and greater
temperatures at which the constituent quark masses drop to the respective
current ones.
| [
{
"created": "Thu, 21 Mar 2019 21:52:20 GMT",
"version": "v1"
}
] | 2019-04-09 | [
[
"Abreu",
"L. M.",
""
],
[
"Corrêa",
"E. B. S.",
""
],
[
"Linhares",
"C. A.",
""
],
[
"Malbouisson",
"A. P. C.",
""
]
] | In this work we analyze the finite-volume and magnetic effects on the phase structure of a generalized version of Nambu--Jona-Lasinio model with three quark flavors. By making use of mean-field approximation and Schwinger's proper-time method in a toroidal topology with antiperiodic conditions, we investigate the gap equation solutions under the change of the size of compactified coordinates, strength of magnetic field, temperature and chemical potential. The 't Hooft interaction contributions are also evaluated. The thermodynamic behavior is strongly affected by the combined effects of relevant variables. The findings suggest that the broken phase is disfavored due to both increasing of temperature and chemical potential, and the drop of the cubic volume of size $L$, whereas it is stimulated with the augmentation of magnetic field. In particular, the reduction of $L$ (remarkably at $L\approx 0.5 - 3 $~fm) engenders a reduction of the constituent masses for $u,d,s$-quarks through a crossover phase transition to the their corresponding current quark masses. On the other hand, the presence of a magnetic background generates greater values constituent quark masses, inducing smaller sizes and greater temperatures at which the constituent quark masses drop to the respective current ones. |
1405.7482 | Debajyoti Dutta | Kalpana Bora, Debajyoti Dutta, Pomita Ghoshal | Determining the Octant of $\theta_{23}$ at LBNE in conjunction with
Reactor Experiments | 18 pages, 36 figures in Mod.Phys.Lett.A, 2015 | Mod.Phys.Lett.A 30, 1550066 (2015) | 10.1142/S0217732315500662 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have explored the possibilities of resolving the $\theta_{23}$ octant
degeneracy present in the newly planned Long-Baseline Neutrino Experiment
(LBNE) by combining reactor data. Reactor experiments have already measured the
third mixing angle $\theta_{13}$ very precisely and this precise measurenent of
$\theta_{13}$ in turn helps in $\theta_{23}$ octant measurement. We have
examined the octant sensitivity with and without reactor data and it improves
if reactor data is added. The comparative study of octant sensitivities of 10kt
and 35kt liquid argon Far Detectors, with and without the Near Detector,
reveals that the sensitivity increases with an increase in detector mass. Also,
the presence of the Near Detector improves the sensitivity. The effect of
adding priors on octant determination is also studied in this work.
| [
{
"created": "Thu, 29 May 2014 07:39:10 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Feb 2015 08:50:04 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Bora",
"Kalpana",
""
],
[
"Dutta",
"Debajyoti",
""
],
[
"Ghoshal",
"Pomita",
""
]
] | We have explored the possibilities of resolving the $\theta_{23}$ octant degeneracy present in the newly planned Long-Baseline Neutrino Experiment (LBNE) by combining reactor data. Reactor experiments have already measured the third mixing angle $\theta_{13}$ very precisely and this precise measurenent of $\theta_{13}$ in turn helps in $\theta_{23}$ octant measurement. We have examined the octant sensitivity with and without reactor data and it improves if reactor data is added. The comparative study of octant sensitivities of 10kt and 35kt liquid argon Far Detectors, with and without the Near Detector, reveals that the sensitivity increases with an increase in detector mass. Also, the presence of the Near Detector improves the sensitivity. The effect of adding priors on octant determination is also studied in this work. |
1707.05343 | Fredrick Olness | The xFitter Developers Team: V. Bertone, D. Britzger, S. Camarda, A.
Cooper-Sarkar, A. Geiser, F. Giuli, A. Glazov, E. Godat, A. Kusina, A.
Luszczak, F. Lyonnet, F. Olness, R. Placakyte, V. Radescu, I. Schienbein, O.
Zenaiev | Impact of the heavy quark matching scales in PDF fits | 18 pages, 12 figures. Updated to match published version | null | 10.1140/epjc/s10052-017-5407-3 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the impact of displaced heavy quark matching scales in a
global fit. The heavy quark matching scale $\mu_{m}$ determines at which energy
scale $\mu$ the QCD theory transitions from $N_{F}$ to $N_{F}+1$ in the
Variable Flavor Number Scheme (VFNS) for the evolution of the Parton
Distribution Functions (PDFs) and strong coupling $\alpha_S(\mu)$. We study the
variation of the matching scales, and their impact on a global PDF fit of the
combined HERA data. As the choice of the matching scale $\mu_{m}$ effectively
is a choice of scheme, this represents a theoretical uncertainty; ideally, we
would like to see minimal dependence on this parameter. For the transition
across the charm quark (from $N_{F}=3$ to $4$), we find a large $\mu_m=\mu_{c}$
dependence of the global fit $\chi^2$ at NLO, but this is significantly reduced
at NNLO. For the transition across the bottom quark (from $N_{F}=4$ to $5$), we
have a reduced $\mu_{m}=\mu_b$ dependence of the $\chi^2$ at both NLO and NNLO
as compared to the charm. This feature is now implemented in xFitter 2.0.0, an
open source QCD fit framework.
| [
{
"created": "Mon, 17 Jul 2017 18:08:33 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Dec 2017 20:04:29 GMT",
"version": "v2"
}
] | 2017-12-25 | [
[
"The xFitter Developers Team",
"",
""
],
[
"Bertone",
"V.",
""
],
[
"Britzger",
"D.",
""
],
[
"Camarda",
"S.",
""
],
[
"Cooper-Sarkar",
"A.",
""
],
[
"Geiser",
"A.",
""
],
[
"Giuli",
"F.",
""
],
[
"... | We investigate the impact of displaced heavy quark matching scales in a global fit. The heavy quark matching scale $\mu_{m}$ determines at which energy scale $\mu$ the QCD theory transitions from $N_{F}$ to $N_{F}+1$ in the Variable Flavor Number Scheme (VFNS) for the evolution of the Parton Distribution Functions (PDFs) and strong coupling $\alpha_S(\mu)$. We study the variation of the matching scales, and their impact on a global PDF fit of the combined HERA data. As the choice of the matching scale $\mu_{m}$ effectively is a choice of scheme, this represents a theoretical uncertainty; ideally, we would like to see minimal dependence on this parameter. For the transition across the charm quark (from $N_{F}=3$ to $4$), we find a large $\mu_m=\mu_{c}$ dependence of the global fit $\chi^2$ at NLO, but this is significantly reduced at NNLO. For the transition across the bottom quark (from $N_{F}=4$ to $5$), we have a reduced $\mu_{m}=\mu_b$ dependence of the $\chi^2$ at both NLO and NNLO as compared to the charm. This feature is now implemented in xFitter 2.0.0, an open source QCD fit framework. |
hep-ph/9503249 | null | N.I.Kochelev | Instanton Effects in $N\bar N$ Annihilation | 11 pages, Latex | Chin.J.Phys. 34 (1996) 956-961 | null | JINR-E2-95-99 | hep-ph | null | It is shown that specific spin-flavour properties of the nonperturbative
interaction between quarks induced by instantons allow us to explain the
peculiarities of the OZI rule violation in $N \bar N$ annihilation. New
experiments to test the instanton mechanism of the OZI rule violation are
proposed.
| [
{
"created": "Tue, 7 Mar 1995 09:01:31 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Mar 1995 10:37:49 GMT",
"version": "v2"
}
] | 2016-09-01 | [
[
"Kochelev",
"N. I.",
""
]
] | It is shown that specific spin-flavour properties of the nonperturbative interaction between quarks induced by instantons allow us to explain the peculiarities of the OZI rule violation in $N \bar N$ annihilation. New experiments to test the instanton mechanism of the OZI rule violation are proposed. |
1412.3357 | Manoj Mandal | M. C. Kumar, M. K. Mandal and V. Ravindran | Associated production of Higgs boson with vector boson at threshold
N$^3$LO in QCD | 14 pages, 3 figures | null | 10.1007/JHEP03(2015)037 | HRI-RECAPP-2014-027 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the results for the associated production of Higgs boson with
vector boson computed at threshold N$^3$LO in QCD. We use the recently
available result on the threshold contributions to the inclusive Drell-Yan
production cross-section at third order in strong coupling constant. We have
implemented it in the publicly available computer package vh@nnlo, thereby
obtaining the numerical impact of threshold N$^3$LO contributions for the first
time. We find that the inclusion of such corrections do reduce theoretical
uncertainties resulting from the renormalization scale.
| [
{
"created": "Wed, 10 Dec 2014 16:32:18 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Kumar",
"M. C.",
""
],
[
"Mandal",
"M. K.",
""
],
[
"Ravindran",
"V.",
""
]
] | We present the results for the associated production of Higgs boson with vector boson computed at threshold N$^3$LO in QCD. We use the recently available result on the threshold contributions to the inclusive Drell-Yan production cross-section at third order in strong coupling constant. We have implemented it in the publicly available computer package vh@nnlo, thereby obtaining the numerical impact of threshold N$^3$LO contributions for the first time. We find that the inclusion of such corrections do reduce theoretical uncertainties resulting from the renormalization scale. |
hep-ph/0207049 | Uleshchenko V. V. ofti off 337 fon | V. Uleshchenko, A. Szczurek | Nonpartonic effects in pion electroproduction in the HERMES kinematical
region | A talk presented at DIS2002, 30 April - 4 May 2002, Cracow | Acta Phys.Polon. B33 (2002) 3299-3304 | null | null | hep-ph | null | The presentation is concerned with higher twist corrections of nonpartonic
origin to semi-inclusive observables in the kinematical region relevant for the
HERMES experiment. We demonstrate a strong impact of the VDM-like interaction
and the exclusive production of $\rho^0$ meson on the extraction of the $\bar d
- \bar u$ asymmetry from charged pion DIS multiplicities. We also show that it
is the exclusive-$\rho^0$ channel which accounts for the experimentally
observed effect of the excess of charged over neutral pions produced at large
$z$.
| [
{
"created": "Wed, 3 Jul 2002 13:40:28 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Uleshchenko",
"V.",
""
],
[
"Szczurek",
"A.",
""
]
] | The presentation is concerned with higher twist corrections of nonpartonic origin to semi-inclusive observables in the kinematical region relevant for the HERMES experiment. We demonstrate a strong impact of the VDM-like interaction and the exclusive production of $\rho^0$ meson on the extraction of the $\bar d - \bar u$ asymmetry from charged pion DIS multiplicities. We also show that it is the exclusive-$\rho^0$ channel which accounts for the experimentally observed effect of the excess of charged over neutral pions produced at large $z$. |
hep-ph/9608406 | null | F. De Fazio | Heavy Quark Kinetic Energy in B Mesons by a QCD Relativistic Potential
Model | Final Version, Accepted for Publication in Mod. Phys. Lett. A. Latex,
12 pages, 2 figures | Mod.Phys.Lett.A11:2693-2702,1996 | 10.1142/S0217732396002691 | BARI-TH/96-233 | hep-ph | null | The matrix element of the kinetic energy operator between B meson states is
computed by means of a QCD relativistic potential model, with the result:
$\mu_\pi^2=0.66 GeV^2$. A comparison with the outcome of other theoretical
approaches and a discussion of the phenomenological implications of this result
are carried out.
| [
{
"created": "Thu, 22 Aug 1996 10:01:46 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Nov 1996 16:03:42 GMT",
"version": "v2"
}
] | 2011-01-25 | [
[
"De Fazio",
"F.",
""
]
] | The matrix element of the kinetic energy operator between B meson states is computed by means of a QCD relativistic potential model, with the result: $\mu_\pi^2=0.66 GeV^2$. A comparison with the outcome of other theoretical approaches and a discussion of the phenomenological implications of this result are carried out. |
hep-ph/9405258 | John McCurry | J. McCurry | Monoslepton production in hadronic collisions | SHEP-93/94-18. 20 pages including 10 uuencoded postscript figures.
Uses LaTeX, epsf | null | null | null | hep-ph | null | Single sparticle creation in high energy collisions as a consequence explicit
$R$-parity breaking, could be a rich source of highly spectacular signals at
future colliders. One particular process, which could lead to a highly exotic
leptonic signal at the LHC, is monoslepton production. In this paper we
qualitatively discuss the constraints on the signal for this process and
calculate the hadronic monoslepton production cross section, taking into
account leading QCD corrections. Our results show the leading corrections could
be quite significant at the proposed LHC operating energy.
| [
{
"created": "Tue, 10 May 1994 12:37:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"McCurry",
"J.",
""
]
] | Single sparticle creation in high energy collisions as a consequence explicit $R$-parity breaking, could be a rich source of highly spectacular signals at future colliders. One particular process, which could lead to a highly exotic leptonic signal at the LHC, is monoslepton production. In this paper we qualitatively discuss the constraints on the signal for this process and calculate the hadronic monoslepton production cross section, taking into account leading QCD corrections. Our results show the leading corrections could be quite significant at the proposed LHC operating energy. |
1306.6461 | Berin Belma Sirvanli | Berin Belma Sirvanli | Lepton Asymmetries for the $B_s -> \gamma l^+ l^- $ Decay in a Family
Nonuniversal Z' Model | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The exclusive $B_s -> \gamma l^+ l^- $ decay is analyzed in the framework of
a family nonuniversal Z' model by calculating the differential branching ratio,
double lepton polarizations and forward-backward asymmetries. Our results are
compared against those of the Standard Model. The predictions of this work are
hoped to can be tested in the near future at LHCb.
| [
{
"created": "Thu, 27 Jun 2013 10:36:42 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Mar 2014 13:50:34 GMT",
"version": "v2"
}
] | 2014-03-17 | [
[
"Sirvanli",
"Berin Belma",
""
]
] | The exclusive $B_s -> \gamma l^+ l^- $ decay is analyzed in the framework of a family nonuniversal Z' model by calculating the differential branching ratio, double lepton polarizations and forward-backward asymmetries. Our results are compared against those of the Standard Model. The predictions of this work are hoped to can be tested in the near future at LHCb. |
hep-ph/9510375 | Robert D. Pisarski | Robert D. Pisarski | In a hot, chirally symmetric phase, $\pi^0$ doesn't go into $2 \gamma$,
but $\pi^0 \sigma$ does | 7 pages, LaTeX. To appear in: "From thermal field theory to neural
networks, a day to remember Tanguy Altherr", World Scientific Publishing | null | 10.1142/9789812830296_0005 | BNL-RP-954 | hep-ph nucl-th | null | In a constituent quark model at nonzero temperature, the amplitude for $\pi^0
\rightarrow 2 \gamma$ vanishes in a chirally symmetric phase, while that for
$\pi^0 \sigma \rightarrow 2 \gamma$ does not.
| [
{
"created": "Mon, 23 Oct 1995 17:16:46 GMT",
"version": "v1"
}
] | 2016-11-03 | [
[
"Pisarski",
"Robert D.",
""
]
] | In a constituent quark model at nonzero temperature, the amplitude for $\pi^0 \rightarrow 2 \gamma$ vanishes in a chirally symmetric phase, while that for $\pi^0 \sigma \rightarrow 2 \gamma$ does not. |
0707.3907 | Benno List | Michael Klasen, Benno List, Stephanie Hansmann-Menzemer and Rainer
Mankel | Summary of the Heavy Flavor Working Group | 17 pages, 3 figures, to appear in the Proceedings of the XV
International Workshop on Deep-Inelastic Scattering and Related Subjectes,
DIS 2007, April 16--20, 2007, Munich, Germany | null | null | LPSC 07-73 | hep-ph | null | During the last year many important results have been achieved in heavy
flavour physics: New measurements of charm and beauty production have been
performed at HERA and the Tevatron. A wealth of new spectroscopy data with
several new, unexpected states in the charmonium and the D_s systems has been
collected and b to d gamma transitions have been established. The oscillation
frequency in the B_s Bbar_s is now measured, and mixing in the D0 D0bar system
has been observed. Theoretical progress in the areas of open heavy flavour
production, quarkonium production and decays, and multiquark spectroscopy has
been presented at this workshop.
| [
{
"created": "Thu, 26 Jul 2007 12:12:25 GMT",
"version": "v1"
}
] | 2007-07-27 | [
[
"Klasen",
"Michael",
""
],
[
"List",
"Benno",
""
],
[
"Hansmann-Menzemer",
"Stephanie",
""
],
[
"Mankel",
"Rainer",
""
]
] | During the last year many important results have been achieved in heavy flavour physics: New measurements of charm and beauty production have been performed at HERA and the Tevatron. A wealth of new spectroscopy data with several new, unexpected states in the charmonium and the D_s systems has been collected and b to d gamma transitions have been established. The oscillation frequency in the B_s Bbar_s is now measured, and mixing in the D0 D0bar system has been observed. Theoretical progress in the areas of open heavy flavour production, quarkonium production and decays, and multiquark spectroscopy has been presented at this workshop. |
1706.10025 | Aaron Park | Aaron Park, Woosung Park, Su Houng Lee | Heptaquarks with two heavy antiquarks in a simple chromomagnetic model | 14 pages, 11 figures, version to be published in prd | Phys. Rev. D 96, 034029 (2017) | 10.1103/PhysRevD.96.034029 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the symmetry property and the stability of the heptaquark
containing two identical heavy antiquarks using color-spin interaction. We
construct the wave function of the heptaquark from the Pauli exclusion
principle in the SU(3) breaking case. The stability of the heptaquark against
the strong decay into one baryon and two mesons is discussed in a simple
chromomagnetic model. We find that $q^2 s^3 \bar{s}^2$ with $I=0,S=\frac{5}{2}$
is the most stable heptaquark configuration that could be probed by
reconstructing the $\Lambda+\phi+\phi$ invariant mass.
| [
{
"created": "Fri, 30 Jun 2017 05:34:22 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Aug 2017 23:45:46 GMT",
"version": "v2"
}
] | 2017-09-06 | [
[
"Park",
"Aaron",
""
],
[
"Park",
"Woosung",
""
],
[
"Lee",
"Su Houng",
""
]
] | We investigate the symmetry property and the stability of the heptaquark containing two identical heavy antiquarks using color-spin interaction. We construct the wave function of the heptaquark from the Pauli exclusion principle in the SU(3) breaking case. The stability of the heptaquark against the strong decay into one baryon and two mesons is discussed in a simple chromomagnetic model. We find that $q^2 s^3 \bar{s}^2$ with $I=0,S=\frac{5}{2}$ is the most stable heptaquark configuration that could be probed by reconstructing the $\Lambda+\phi+\phi$ invariant mass. |
hep-ph/0605044 | Tetsuo Hyodo | Tetsuo Hyodo and Atsushi Hosaka (RCNP, Osaka Univ.) | Phenomenological study for the Theta+ and two-meson coupling | 30 pages, 9 figures 9 tables, Talk given at International Workshop
HNP06 at JAEA, Kizu, Japan, Feb. 16-18, 2006 | null | null | null | hep-ph | null | We examine several assignments of spin and parity for the pentaquark Theta+
state (J^P=1/2^{+,-}, 3/2^{+,-}) in connection with phenomenology of known
baryon resonances, using a general framework based on the flavor symmetry.
Assuming that the Theta+ belongs to an antidecuplet representation which mixes
with an octet, we calculate the mass spectra of the flavor partners of the
Theta+ based on the SU(3) symmetry. The decay widths of the Theta+ and nucleon
partners are analyzed for the consistency check of the mixing angle obtained
from the masses. It is found that a suitable choice of the mixing angle
successfully reproduces the observed masses of exotics, when their spin and
parity are assigned to be J^P=3/2^-, together with other nonexotic resonances
of J^P=3/2^-. The decay widths of Theta -> KN, N(1520) -> pi N, and N(1700) ->
pi N are also reproduced simultaneously. We then evaluate two-meson couplings
of Theta+, using experimental information of nucleon partners decaying into pi
pi N channels, in which the two pions are in scalar- and vector-type
correlations. We examine two assignments of spin and parity J^P=1/2^+ and
3/2^-, for which the experimental spectra of known resonances with exotic
baryons are properly reproduced by an octet-antidecuplet representation mixing
scheme. Using the obtained coupling constants, total cross sections of the
reactions pi- p -> K- Theta+ and K+ p -> pi+ Theta+ are calculated. Substantial
interference of two terms may occur in the reaction processes for the J^P=1/2^+
case, whereas the interference effect is rather small for the 3/2^- case.
| [
{
"created": "Thu, 4 May 2006 13:26:35 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hyodo",
"Tetsuo",
"",
"RCNP, Osaka Univ."
],
[
"Hosaka",
"Atsushi",
"",
"RCNP, Osaka Univ."
]
] | We examine several assignments of spin and parity for the pentaquark Theta+ state (J^P=1/2^{+,-}, 3/2^{+,-}) in connection with phenomenology of known baryon resonances, using a general framework based on the flavor symmetry. Assuming that the Theta+ belongs to an antidecuplet representation which mixes with an octet, we calculate the mass spectra of the flavor partners of the Theta+ based on the SU(3) symmetry. The decay widths of the Theta+ and nucleon partners are analyzed for the consistency check of the mixing angle obtained from the masses. It is found that a suitable choice of the mixing angle successfully reproduces the observed masses of exotics, when their spin and parity are assigned to be J^P=3/2^-, together with other nonexotic resonances of J^P=3/2^-. The decay widths of Theta -> KN, N(1520) -> pi N, and N(1700) -> pi N are also reproduced simultaneously. We then evaluate two-meson couplings of Theta+, using experimental information of nucleon partners decaying into pi pi N channels, in which the two pions are in scalar- and vector-type correlations. We examine two assignments of spin and parity J^P=1/2^+ and 3/2^-, for which the experimental spectra of known resonances with exotic baryons are properly reproduced by an octet-antidecuplet representation mixing scheme. Using the obtained coupling constants, total cross sections of the reactions pi- p -> K- Theta+ and K+ p -> pi+ Theta+ are calculated. Substantial interference of two terms may occur in the reaction processes for the J^P=1/2^+ case, whereas the interference effect is rather small for the 3/2^- case. |
hep-ph/9704376 | Robert Fleischer | Andrzej J. Buras and Robert Fleischer | Quark mixing, CP violation and rare decays after the top quark discovery | 180 pages, 35 figures, LaTeX. To appear in Heavy Flavours II, World
Scientific (1997), Eds. A.J. Buras and M. Lindner. The complete paper is also
available via anonymous ftp at ftp://www-ttp.physik.uni-karlsruhe.de/ , or
via www at http://www-ttp.physik.uni-karlsruhe.de/cgi-bin/preprints/ | Adv.Ser.Direct.HighEnergyPhys.15:65-238,1998 | 10.1142/9789812812667_0002 | TUM-HEP-275/97, TTP97-15 | hep-ph | null | We review the highlights of quark mixing, particle-antiparticle mixing, CP
violation and rare K- and B-decays in the Standard Model. The top quark
discovery, the precise measurement of its mass, the improved knowledge of the
couplings $V_{cb}$ and $V_{ub}$, and the calculations of NLO short distance QCD
corrections improved considerably the predictions for various decay rates, the
determination of the couplings $V_{td}$ and $V_{ts}$ and of the complex phase
in the Cabibbo-Kobayashi-Maskawa matrix. After presenting the general
theoretical framework for weak decays, we discuss the following topics in
detail: i) the CKM matrix, its most convenient parametrizations and the
unitarity triangle, ii) the CP-violating parameter $\epsilon_K$ and
$B^0_{d,s}-\bar B^0_{d,s}$ mixings, iii) the ratio $\epsilon'/\epsilon$, iv)
the rare K-decays $K_L\to\pi^0e^+e^-$, $K^+\to\pi^+\nu\bar\nu$,
$K_L\to\pi^0\nu\bar\nu$ and $K_L\to\mu^+\mu^-$, v) the radiative decays $B\to
X_s\gamma$ and $B\to X_s l^+l^-$, vi) the rare B-decays $B\to
X_{s,d}\nu\bar\nu$ and $B_{d,s}\to l^+l^-$, vii) CP violation in neutral and
charged B-decays putting emphasis on clean determinations of the angles of the
unitarity triangle, and viii) the role of electroweak penguins in B-decays. We
present several future visions demonstrating very clearly the great potential
of CP asymmetries in B-decays and of clean K-decays such as $K^+\to\pi^+\nu
\bar\nu$ and $K_L\to\pi^0\nu\bar\nu$ in the determination of the CKM parameters
and in decisive testing of the Standard Model. An outlook for the coming years
ends our review.
| [
{
"created": "Tue, 22 Apr 1997 13:52:04 GMT",
"version": "v1"
}
] | 2016-11-03 | [
[
"Buras",
"Andrzej J.",
""
],
[
"Fleischer",
"Robert",
""
]
] | We review the highlights of quark mixing, particle-antiparticle mixing, CP violation and rare K- and B-decays in the Standard Model. The top quark discovery, the precise measurement of its mass, the improved knowledge of the couplings $V_{cb}$ and $V_{ub}$, and the calculations of NLO short distance QCD corrections improved considerably the predictions for various decay rates, the determination of the couplings $V_{td}$ and $V_{ts}$ and of the complex phase in the Cabibbo-Kobayashi-Maskawa matrix. After presenting the general theoretical framework for weak decays, we discuss the following topics in detail: i) the CKM matrix, its most convenient parametrizations and the unitarity triangle, ii) the CP-violating parameter $\epsilon_K$ and $B^0_{d,s}-\bar B^0_{d,s}$ mixings, iii) the ratio $\epsilon'/\epsilon$, iv) the rare K-decays $K_L\to\pi^0e^+e^-$, $K^+\to\pi^+\nu\bar\nu$, $K_L\to\pi^0\nu\bar\nu$ and $K_L\to\mu^+\mu^-$, v) the radiative decays $B\to X_s\gamma$ and $B\to X_s l^+l^-$, vi) the rare B-decays $B\to X_{s,d}\nu\bar\nu$ and $B_{d,s}\to l^+l^-$, vii) CP violation in neutral and charged B-decays putting emphasis on clean determinations of the angles of the unitarity triangle, and viii) the role of electroweak penguins in B-decays. We present several future visions demonstrating very clearly the great potential of CP asymmetries in B-decays and of clean K-decays such as $K^+\to\pi^+\nu \bar\nu$ and $K_L\to\pi^0\nu\bar\nu$ in the determination of the CKM parameters and in decisive testing of the Standard Model. An outlook for the coming years ends our review. |
1502.07716 | Kei Yagyu | Shinya Kanemura, Mariko Kikuchi, Kei Yagyu | Fingerprinting the extended Higgs sector using one-loop corrected Higgs
boson couplings and future precision measurements | Version published in Nuclear Physics B | null | 10.1016/j.nuclphysb.2015.04.015 | UT-HET 099 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate radiative corrections to a full set of coupling constants for
the 125 GeV Higgs boson at the one-loop level in two Higgs doublet models with
four types of Yukawa interaction under the softly-broken discrete $Z_2$
symmetry. The renormalization calculations are performed in the on-shell
scheme, in which the gauge dependence in the mixing parameter which appears in
the previous calculation is consistently avoided. We first show the details of
our renormalizaton scheme, and present the complete set of the analytic
formulae of the renormalized couplings. We then numerically demonstrate how the
inner parameters of the model can be extracted by the future precision
measurements of these couplings at the high luminosity LHC and the
International Linear Collider.
| [
{
"created": "Thu, 26 Feb 2015 20:26:39 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Apr 2015 19:06:27 GMT",
"version": "v2"
}
] | 2015-05-20 | [
[
"Kanemura",
"Shinya",
""
],
[
"Kikuchi",
"Mariko",
""
],
[
"Yagyu",
"Kei",
""
]
] | We calculate radiative corrections to a full set of coupling constants for the 125 GeV Higgs boson at the one-loop level in two Higgs doublet models with four types of Yukawa interaction under the softly-broken discrete $Z_2$ symmetry. The renormalization calculations are performed in the on-shell scheme, in which the gauge dependence in the mixing parameter which appears in the previous calculation is consistently avoided. We first show the details of our renormalizaton scheme, and present the complete set of the analytic formulae of the renormalized couplings. We then numerically demonstrate how the inner parameters of the model can be extracted by the future precision measurements of these couplings at the high luminosity LHC and the International Linear Collider. |
hep-ph/0604065 | Christian Bauer | Christian W. Bauer, Matthew D. Schwartz | Improving jet distributions with effective field theory | 4 pages, 1 figure; typos corrected and notation updated to match
hep-ph/0607296 | Phys.Rev.Lett.97:142001,2006 | 10.1103/PhysRevLett.97.142001 | LBNL-59964 | hep-ph | null | We obtain perturbative expressions for jet distributions using soft-collinear
effective theory (SCET). By matching SCET onto QCD at high energy, tree level
matrix elements and higher order virtual corrections can be reproduced in SCET.
The resulting operators are then evolved to lower scales, with additional
operators being populated by required threshold matchings in the effective
theory. We show that the renormalization group evolution and threshold
matchings reproduce the Sudakov factors and splitting functions of QCD, and
that the effective theory naturally combines QCD matrix elements and parton
showers. The effective theory calculation is systematically improvable and any
higher order perturbative effects can be included by a well defined procedure.
| [
{
"created": "Fri, 7 Apr 2006 19:30:39 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Nov 2006 14:48:13 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bauer",
"Christian W.",
""
],
[
"Schwartz",
"Matthew D.",
""
]
] | We obtain perturbative expressions for jet distributions using soft-collinear effective theory (SCET). By matching SCET onto QCD at high energy, tree level matrix elements and higher order virtual corrections can be reproduced in SCET. The resulting operators are then evolved to lower scales, with additional operators being populated by required threshold matchings in the effective theory. We show that the renormalization group evolution and threshold matchings reproduce the Sudakov factors and splitting functions of QCD, and that the effective theory naturally combines QCD matrix elements and parton showers. The effective theory calculation is systematically improvable and any higher order perturbative effects can be included by a well defined procedure. |
1001.3021 | Konrad Tywoniuk | Nestor Armesto, Alexei B. Kaidalov, Carlos A. Salgado, Konrad Tywoniuk | A unitarized model of inclusive and diffractive DIS with Q2-evolution | 22 pages, 12 figures | null | 10.1103/PhysRevD.81.074002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the interplay of low-x physics and QCD scaling violations by
extending the unified approach describing inclusive structure functions and
diffractive production in $\gamma* p$ interactions proposed in previous papers,
to large values of Q2. We describe the procedure of extracting, from the
non-perturbative model, initial conditions for the QCD evolution that respect
unitarity. Assuming Regge factorization of the diffractive structure function,
a similar procedure is proposed for the calculation of hard diffraction. The
results are in good agreement with experimental data on the proton structure
function $F_2$ and the most recent data on the reduced diffractive cross
section, $x_P \sigma_r^{\D(3)}$. Predictions for both $F_2$ and $F_L$ are
presented in a wide kinematical range and compared to calculations within
high-energy QCD.
| [
{
"created": "Mon, 18 Jan 2010 11:10:58 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Armesto",
"Nestor",
""
],
[
"Kaidalov",
"Alexei B.",
""
],
[
"Salgado",
"Carlos A.",
""
],
[
"Tywoniuk",
"Konrad",
""
]
] | We discuss the interplay of low-x physics and QCD scaling violations by extending the unified approach describing inclusive structure functions and diffractive production in $\gamma* p$ interactions proposed in previous papers, to large values of Q2. We describe the procedure of extracting, from the non-perturbative model, initial conditions for the QCD evolution that respect unitarity. Assuming Regge factorization of the diffractive structure function, a similar procedure is proposed for the calculation of hard diffraction. The results are in good agreement with experimental data on the proton structure function $F_2$ and the most recent data on the reduced diffractive cross section, $x_P \sigma_r^{\D(3)}$. Predictions for both $F_2$ and $F_L$ are presented in a wide kinematical range and compared to calculations within high-energy QCD. |
1006.5339 | Nicolas Greiner | Nicolas Greiner, Alberto Guffanti, Jean-Philippe Guillet, Thomas
Reiter, Juergen Reuter | NLO QCD corrections to 4 b-quark production | Contribution to the XVIII International Workshop on Deep-Inelastic
Scattering and Related Subjects, DIS 2010, April 19-23, 2010, Florence,
Italy, 6 pages, 3 figures | PoS DIS2010:156,2010 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk we present the recent calculation of the NLO QCD corrections to
the production of four b-quarks induced by initial state quarks at the CERN
LHC. We describe the details of the calculation using the GOLEM approach for
the virtual corrections and MadEvent/MadDipole for the real emission part and
present some results.
| [
{
"created": "Mon, 28 Jun 2010 13:06:43 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Greiner",
"Nicolas",
""
],
[
"Guffanti",
"Alberto",
""
],
[
"Guillet",
"Jean-Philippe",
""
],
[
"Reiter",
"Thomas",
""
],
[
"Reuter",
"Juergen",
""
]
] | In this talk we present the recent calculation of the NLO QCD corrections to the production of four b-quarks induced by initial state quarks at the CERN LHC. We describe the details of the calculation using the GOLEM approach for the virtual corrections and MadEvent/MadDipole for the real emission part and present some results. |
2204.05284 | Luca Di Luzio | Luca Di Luzio, Ramona Gr\"ober, Paride Paradisi | Higgs physics confronts the $M_W$ anomaly | 13 pages, 1 figure. Version to appear in Physics Letters B | null | 10.1016/j.physletb.2022.137250 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The recent high-precision measurement of the $W$ mass by the CDF
collaboration is in sharp tension with the Standard Model prediction as
obtained by the electroweak fit. If confirmed, this finding can only be
explained in terms of new physics effects. In this work, we point out a generic
connection between the $M_W$ anomaly and Higgs physics observables such as
$h\to\gamma\gamma, Z\gamma$ and the ratio $h\to ZZ/WW$. Moreover, we
systematically classify new physics scenarios which can address the $M_W$
anomaly via a tree-level contribution to the $\hat T$ parameter. These include
a real scalar triplet, a scalar quadruplet with the same hypercharge of the
Higgs doublet, a $Z'$ boson, a vector triplet with unit hypercharge and a
vector boson with the gauge quantum numbers of the Higgs doublet. These
solutions to the $M_W$ anomaly are characterized by new physics states which
are typically too heavy to be discovered in direct searches, but which might
leave their imprints in Higgs physics.
| [
{
"created": "Mon, 11 Apr 2022 17:42:21 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Apr 2022 15:30:45 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Jun 2022 17:54:55 GMT",
"version": "v3"
}
] | 2022-06-22 | [
[
"Di Luzio",
"Luca",
""
],
[
"Gröber",
"Ramona",
""
],
[
"Paradisi",
"Paride",
""
]
] | The recent high-precision measurement of the $W$ mass by the CDF collaboration is in sharp tension with the Standard Model prediction as obtained by the electroweak fit. If confirmed, this finding can only be explained in terms of new physics effects. In this work, we point out a generic connection between the $M_W$ anomaly and Higgs physics observables such as $h\to\gamma\gamma, Z\gamma$ and the ratio $h\to ZZ/WW$. Moreover, we systematically classify new physics scenarios which can address the $M_W$ anomaly via a tree-level contribution to the $\hat T$ parameter. These include a real scalar triplet, a scalar quadruplet with the same hypercharge of the Higgs doublet, a $Z'$ boson, a vector triplet with unit hypercharge and a vector boson with the gauge quantum numbers of the Higgs doublet. These solutions to the $M_W$ anomaly are characterized by new physics states which are typically too heavy to be discovered in direct searches, but which might leave their imprints in Higgs physics. |
0901.3951 | Baier | V. N. Baier and V. M. Katkov | Spectra of radiation and created particles at intermediate energy in
oriented crystal taking into account energy loss | 11 pages, 5 figures, report at "Channeling 2008" Workshop, Erice,
Italy, October 2008 | Int.J.Mod.Phys.A25S1:34-46,2010 | 10.1142/S0217751X1004989X | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spectral distribution of positron created by photon and the spectral
distribution of photons radiated from electron in an oriented single crystal of
intermediate thickness is calculated at intermediate energies. The energy loss
of charged particles as well as photon absorption are taken into account. The
used basic probabilities of processes include the action of field of axis as
well as the multiple scattering of radiating electron or particles of the
created pair (the Landau-Pomeranchuk-Migdal (LPM) effect)
| [
{
"created": "Mon, 26 Jan 2009 07:07:26 GMT",
"version": "v1"
}
] | 2011-07-14 | [
[
"Baier",
"V. N.",
""
],
[
"Katkov",
"V. M.",
""
]
] | The spectral distribution of positron created by photon and the spectral distribution of photons radiated from electron in an oriented single crystal of intermediate thickness is calculated at intermediate energies. The energy loss of charged particles as well as photon absorption are taken into account. The used basic probabilities of processes include the action of field of axis as well as the multiple scattering of radiating electron or particles of the created pair (the Landau-Pomeranchuk-Migdal (LPM) effect) |
1908.11256 | Nicolas Chanon | Aurelien Carle, Nicolas Chanon, Stephane Perries | Prospects for Lorentz Invariance Violation searches with top pair
production at the LHC and future hadron colliders | 6 pages, 2 figures | null | 10.1140/epjc/s10052-020-7715-2 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper investigates a signature of Lorentz invariance violation with the
$t\bar{t}$ production at the LHC and future hadron colliders. Possible
deviations from the Lorentz symmetry remain poorly constrained in the top quark
sector. With a dedicated analysis of $t\bar{t}$ events produced at the LHC,
bounds in the top sector can be improved by up to three orders of magnitude
relative to Tevatron, the only measurement existing so far. The sensitivity
will be even further enhanced at the HL-LHC and future colliders.
| [
{
"created": "Thu, 29 Aug 2019 14:30:04 GMT",
"version": "v1"
}
] | 2020-03-18 | [
[
"Carle",
"Aurelien",
""
],
[
"Chanon",
"Nicolas",
""
],
[
"Perries",
"Stephane",
""
]
] | This paper investigates a signature of Lorentz invariance violation with the $t\bar{t}$ production at the LHC and future hadron colliders. Possible deviations from the Lorentz symmetry remain poorly constrained in the top quark sector. With a dedicated analysis of $t\bar{t}$ events produced at the LHC, bounds in the top sector can be improved by up to three orders of magnitude relative to Tevatron, the only measurement existing so far. The sensitivity will be even further enhanced at the HL-LHC and future colliders. |
1106.4819 | Bryan Zald\'ivar Montero | Yann Mambrini and Bryan Zald\'ivar | When LEP and Tevatron combined with WMAP and XENON100 shed light on the
nature of Dark Matter | 8 pages, 6 figures | null | 10.1088/1475-7516/2011/10/023 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, several astrophysical data or would-be signals has been observed in
different dark-matter oriented experiments. In each case, one could fit the
data at the price of specific nature of the coupling between the Standard Model
(SM) particles and a light Dark Matter candidate: hadrophobic (INTEGRAL,
PAMELA) or leptophobic (WMAP Haze, dijet anomalies of CDF, FERMI Galactic
Center observation). In this work, we show that when one takes into account the
more recent LEP and Tevatron analysis, a light thermal fermionic Dark Matte
(\lesssim 10 GeV) that couples to electrons is mainly ruled out if one combines
the analysis with WMAP constraints. We also study the special case of scalar
dark matter, using a mono-photon events simulation to constrain the coupling of
dark matter to electron.
| [
{
"created": "Thu, 23 Jun 2011 20:00:11 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Mambrini",
"Yann",
""
],
[
"Zaldívar",
"Bryan",
""
]
] | Recently, several astrophysical data or would-be signals has been observed in different dark-matter oriented experiments. In each case, one could fit the data at the price of specific nature of the coupling between the Standard Model (SM) particles and a light Dark Matter candidate: hadrophobic (INTEGRAL, PAMELA) or leptophobic (WMAP Haze, dijet anomalies of CDF, FERMI Galactic Center observation). In this work, we show that when one takes into account the more recent LEP and Tevatron analysis, a light thermal fermionic Dark Matte (\lesssim 10 GeV) that couples to electrons is mainly ruled out if one combines the analysis with WMAP constraints. We also study the special case of scalar dark matter, using a mono-photon events simulation to constrain the coupling of dark matter to electron. |
1308.3767 | Moslem Ahmadvand | M. Ahmadvand | Baryogenesis within the two-Higgs-doublet model in the Electroweak scale | 10 pages, 3 figures, To be published in Int. J. Mod. Phys. A | Int. J. Mod. Phys. A. Vol. 29 (2014) 1450090 | 10.1142/S0217751X14500900 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The conventional baryogenesis mechanism is based on the one Higgs doublet
within the standard model, at the electroweak scale $T\sim 100 GeV$. In this
model the strong first order phase transition due to the spontaneous symmetry
breaking imposes the folowing condition on the mass of the Higgs field:
$m_H\lesssim 40 GeV$, which is contrary to the recently observed value
$m_H\simeq 126 GeV$. In this paper we propose a baryogenesis mechanism within a
two-Higgs-doublet model in which the phase transition occurs in one stage. This
model is consistent with the observed mass of the Higgs. We obtain the true
vacuum bubble wall velocity and thickness in this model. Then, we use nonlocal
baryogenesis mechanism in which the interaction of fermions with the boundary
of the expanding bubbles leads to CP violation and sphaleron mediated
baryogenesis.
| [
{
"created": "Sat, 17 Aug 2013 08:51:52 GMT",
"version": "v1"
},
{
"created": "Mon, 12 May 2014 19:44:56 GMT",
"version": "v2"
}
] | 2014-05-27 | [
[
"Ahmadvand",
"M.",
""
]
] | The conventional baryogenesis mechanism is based on the one Higgs doublet within the standard model, at the electroweak scale $T\sim 100 GeV$. In this model the strong first order phase transition due to the spontaneous symmetry breaking imposes the folowing condition on the mass of the Higgs field: $m_H\lesssim 40 GeV$, which is contrary to the recently observed value $m_H\simeq 126 GeV$. In this paper we propose a baryogenesis mechanism within a two-Higgs-doublet model in which the phase transition occurs in one stage. This model is consistent with the observed mass of the Higgs. We obtain the true vacuum bubble wall velocity and thickness in this model. Then, we use nonlocal baryogenesis mechanism in which the interaction of fermions with the boundary of the expanding bubbles leads to CP violation and sphaleron mediated baryogenesis. |
2101.03681 | Chathuranga Sirimanna | Shanshan Cao, Chathuranga Sirimanna, Abhijit Majumder | The medium modification of high-virtuality partons | 25 pages, 6 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The modification of the hard core of jets in a dense QCD medium is studied.
In particular, we consider partons which possess a virtuality somewhat larger
than the multiple scattering scale of the medium ($\hat{q} \tau$, where
$\hat{q}$ is the transverse broadening jet transport coefficient, and $\tau$ is
the formation length of a particular emission). We delineate the region of
parameter space where the higher-twist approach is applicable, and derive the
in-medium DGLAP evolution equation. We study a region in parameter space where
this is the dominant mechanism of energy loss. We argue that such a regime is
pervasive in most cases of jets in $A$-$A$ and future $e$-$A$ collisions, and
controls the modification of the hard core of jets and the leading single
particle spectrum at high transverse momentum ($p_\mathrm{T}$).
| [
{
"created": "Mon, 11 Jan 2021 02:55:49 GMT",
"version": "v1"
}
] | 2021-01-12 | [
[
"Cao",
"Shanshan",
""
],
[
"Sirimanna",
"Chathuranga",
""
],
[
"Majumder",
"Abhijit",
""
]
] | The modification of the hard core of jets in a dense QCD medium is studied. In particular, we consider partons which possess a virtuality somewhat larger than the multiple scattering scale of the medium ($\hat{q} \tau$, where $\hat{q}$ is the transverse broadening jet transport coefficient, and $\tau$ is the formation length of a particular emission). We delineate the region of parameter space where the higher-twist approach is applicable, and derive the in-medium DGLAP evolution equation. We study a region in parameter space where this is the dominant mechanism of energy loss. We argue that such a regime is pervasive in most cases of jets in $A$-$A$ and future $e$-$A$ collisions, and controls the modification of the hard core of jets and the leading single particle spectrum at high transverse momentum ($p_\mathrm{T}$). |
hep-ph/9807287 | Mikko Vanttinen | M. V\"anttinen and L. Mankiewicz (TU Munich) | Exclusive $J/\psi$ photoproduction and gluon polarization | 11 pages, Latex, psfig, 2 figures; v2: references and acknowledgement
updated; v3: sign of asymmetry reversed, conclusions unchanged, to appear in
Phys. Lett. B | Phys.Lett. B440 (1998) 157-162 | 10.1016/S0370-2693(98)01076-4 | TUM/T39-98-21 | hep-ph | null | In exclusive $J/\psi$ production by polarized photons incident on polarized
protons, a finite polarization asymmetry arises because of $c\bar c$
Fermi-motion and binding-energy effects. The asymmetry depends on the polarized
nonforward gluon distribution of the proton and thus gives information on gluon
polarization in the proton. The analyzing power, however, is rather small.
| [
{
"created": "Wed, 8 Jul 1998 14:01:48 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Aug 1998 09:40:44 GMT",
"version": "v2"
},
{
"created": "Fri, 16 Oct 1998 12:54:54 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Vänttinen",
"M.",
"",
"TU Munich"
],
[
"Mankiewicz",
"L.",
"",
"TU Munich"
]
] | In exclusive $J/\psi$ production by polarized photons incident on polarized protons, a finite polarization asymmetry arises because of $c\bar c$ Fermi-motion and binding-energy effects. The asymmetry depends on the polarized nonforward gluon distribution of the proton and thus gives information on gluon polarization in the proton. The analyzing power, however, is rather small. |
0910.2480 | Gil Paz | Gil Paz | From A to Z': Combining Anomaly and Z' Mediation of Supersymmetry
Breaking | Talk given at the 17th International Conference On Supersymmetry And
The Unification Of Fundamental Interactions (SUSY 09), 5-10 Jun 2009, Boston,
Massachusetts, USA | AIP Conf.Proc.1200:549-552,2010 | 10.1063/1.3327669 | EFI 09-27 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Combining anomaly with Z' mediation allows us to solve the tachyonic slepton
problem of the former and avoid fine tuning in the latter. We describe how the
two mechanisms can be combined, and some of the phenomenology of such a joint
scenario.
| [
{
"created": "Tue, 13 Oct 2009 21:41:56 GMT",
"version": "v1"
}
] | 2015-05-14 | [
[
"Paz",
"Gil",
""
]
] | Combining anomaly with Z' mediation allows us to solve the tachyonic slepton problem of the former and avoid fine tuning in the latter. We describe how the two mechanisms can be combined, and some of the phenomenology of such a joint scenario. |
1204.3772 | Matteo Giordano | Matteo Giordano | Wilson-loop formalism for Reggeon exchange in soft high-energy
scattering | A few misprints in the expressions for the relevant Wilson loops have
been corrected. 55 pages, 7 figures | JHEP 1207 (2012) 109 | 10.1007/JHEP07(2012)109 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a nonperturbative expression for the non-vacuum,
qqbar-Reggeon-exchange contribution to the meson-meson elastic scattering
amplitude at high energy and low momentum transfer, in the framework of QCD.
Describing the mesons in terms of colourless qqbar dipoles, the problem is
reduced to the two-fermion-exchange contribution to the dipole-dipole
scattering amplitudes, which is expressed as a path integral, over the
trajectories of the exchanged fermions, of the expectation value of a certain
Wilson loop. We also show how the resulting expression can be reconstructed
from a corresponding quantity in the Euclidean theory, by means of analytic
continuation. Finally, we make contact with previous work on Reggeon exchange
in the gauge/gravity duality approach.
| [
{
"created": "Tue, 17 Apr 2012 11:51:09 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Jul 2012 10:43:14 GMT",
"version": "v2"
},
{
"created": "Thu, 6 Dec 2012 13:55:59 GMT",
"version": "v3"
}
] | 2015-06-04 | [
[
"Giordano",
"Matteo",
""
]
] | We derive a nonperturbative expression for the non-vacuum, qqbar-Reggeon-exchange contribution to the meson-meson elastic scattering amplitude at high energy and low momentum transfer, in the framework of QCD. Describing the mesons in terms of colourless qqbar dipoles, the problem is reduced to the two-fermion-exchange contribution to the dipole-dipole scattering amplitudes, which is expressed as a path integral, over the trajectories of the exchanged fermions, of the expectation value of a certain Wilson loop. We also show how the resulting expression can be reconstructed from a corresponding quantity in the Euclidean theory, by means of analytic continuation. Finally, we make contact with previous work on Reggeon exchange in the gauge/gravity duality approach. |
1106.3028 | Bin Pan | B. Pan | Meson Mass Spectrum of Heavy-Light Quarks Combinations with Dirac
Equation | 23 pages, 13 fig. v3, correct typo, add fig, add average data | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the Dirac equation to study the mass spectrum of mesons with
heavy-light quark combinations. First we study the Dirac equation with
spherically symmetry and funnel potential, and apply them on the hydrogen-like
atom problem to check the correctness of our numerical program. Then we test
the parameters in Olsson's paper. We show that Olsson's parameters are good in
fitting the averaged central mass, but fail to get correct energy fine
splitting. Finally we fit the mass spectrum data of D, D_s, B and B_s mesons
with our parameters by solve the Dirac equation and funnel potential, calculate
the energy splitting of the S and P states. Our parameters can fit the mass and
fine splitting with errors in less than 7 MeV.
| [
{
"created": "Wed, 15 Jun 2011 17:18:51 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Jun 2011 15:22:49 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Nov 2011 16:41:37 GMT",
"version": "v3"
}
] | 2011-11-24 | [
[
"Pan",
"B.",
""
]
] | We use the Dirac equation to study the mass spectrum of mesons with heavy-light quark combinations. First we study the Dirac equation with spherically symmetry and funnel potential, and apply them on the hydrogen-like atom problem to check the correctness of our numerical program. Then we test the parameters in Olsson's paper. We show that Olsson's parameters are good in fitting the averaged central mass, but fail to get correct energy fine splitting. Finally we fit the mass spectrum data of D, D_s, B and B_s mesons with our parameters by solve the Dirac equation and funnel potential, calculate the energy splitting of the S and P states. Our parameters can fit the mass and fine splitting with errors in less than 7 MeV. |
hep-ph/0503125 | Jorge Russo | Diego Chialva, Roberto Iengo and Jorge G. Russo | Cross sections for production of closed superstrings at high energy
colliders in brane world models | 18 pages, 3 figures. Reference added | Phys.Rev.D71:106009,2005 | 10.1103/PhysRevD.71.106009 | UB-ECM-PF-05/05, SISSA-19/2005/EP | hep-ph hep-th | null | In brane world string models with large extra dimensions, there are processes
where fermion and antifermion (or two gluons) can annihilate producing a light
particle (e.g. gluon) carrying transverse momentum and a Kaluza-Klein graviton
or an excited closed string that propagates in the extra dimensions. In high
energy colliders, this process gives a missing momentum signature. We compute
the total cross section for this process within the context of type II
superstring theory in the presence of a D brane. This includes all missing
energy sources for this string theory model up to s=8M_s^2, and it can be used
to put new limits on the string scale M_s.
| [
{
"created": "Mon, 14 Mar 2005 14:55:28 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Mar 2005 17:59:17 GMT",
"version": "v2"
},
{
"created": "Tue, 24 May 2005 10:52:14 GMT",
"version": "v3"
}
] | 2014-11-18 | [
[
"Chialva",
"Diego",
""
],
[
"Iengo",
"Roberto",
""
],
[
"Russo",
"Jorge G.",
""
]
] | In brane world string models with large extra dimensions, there are processes where fermion and antifermion (or two gluons) can annihilate producing a light particle (e.g. gluon) carrying transverse momentum and a Kaluza-Klein graviton or an excited closed string that propagates in the extra dimensions. In high energy colliders, this process gives a missing momentum signature. We compute the total cross section for this process within the context of type II superstring theory in the presence of a D brane. This includes all missing energy sources for this string theory model up to s=8M_s^2, and it can be used to put new limits on the string scale M_s. |
0808.3594 | Patricia Magalh\~aes | P.C.Magalh\~aes and M.R. Robilotta | Elastic $K\pi$ amplitude: a simple model | 13 pages, 4 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a chiral model for the $J=0, I=1/2,$ elastic $K\p$ amplitude,
suited to be employed in $D^+ \rar K^- \p^+ \p^+$ data analyses and valid
between threshold and $1.5 $GeV. Although not as precise as other versions
available in the literature, it is rather simple and incorporates the essential
physics in this energy domain. In the case of the $K$-matrix approximation, the
model allows the pole structure of the $K\p$ amplitude to be understood by
solving a quadratic equation in $s$. We show that the solutions to this
equation can be well approximated by polynomials of masses and coupling
constants. This analytic structure allows a clear understanding why, depending
on the values of one of the coupling constants, one may have one or two
physical poles. The model yields a pole, associated with the $\k$, at
$\sqrt{s}= (0.75 - i 0.24) $GeV.
| [
{
"created": "Tue, 26 Aug 2008 21:35:11 GMT",
"version": "v1"
}
] | 2008-08-28 | [
[
"Magalhães",
"P. C.",
""
],
[
"Robilotta",
"M. R.",
""
]
] | We present a chiral model for the $J=0, I=1/2,$ elastic $K\p$ amplitude, suited to be employed in $D^+ \rar K^- \p^+ \p^+$ data analyses and valid between threshold and $1.5 $GeV. Although not as precise as other versions available in the literature, it is rather simple and incorporates the essential physics in this energy domain. In the case of the $K$-matrix approximation, the model allows the pole structure of the $K\p$ amplitude to be understood by solving a quadratic equation in $s$. We show that the solutions to this equation can be well approximated by polynomials of masses and coupling constants. This analytic structure allows a clear understanding why, depending on the values of one of the coupling constants, one may have one or two physical poles. The model yields a pole, associated with the $\k$, at $\sqrt{s}= (0.75 - i 0.24) $GeV. |
0712.1227 | Nora Brambilla | Nora Brambilla | Effective Field Theories for Heavy Quarkonium | Invited Plenary talk at The 20th European Conference on Few-Body
Problems in Physics. September 10-14 2007. Pisa, Italy. To be published on
Few-Body Systems | Few Body Syst.43:25-30,2008 | 10.1007/s00601-008-0204-z | null | hep-ph hep-th nucl-th | null | We briefly review how nonrelativistic effective field theories give us a
definition of the QCD potentials and a coherent field theory derived quantum
mechanical scheme to calculate the properties of bound states made by two or
more heavy quarks. In this framework heavy quarkonium properties depend only on
the QCD parameters (quark masses and $\als$) and nonpotential corrections are
systematically accounted for. The relation between the form of the
nonperturbative potentials and the low energy QCD dynamics is also discussed.
| [
{
"created": "Sun, 9 Dec 2007 15:36:56 GMT",
"version": "v1"
}
] | 2009-01-08 | [
[
"Brambilla",
"Nora",
""
]
] | We briefly review how nonrelativistic effective field theories give us a definition of the QCD potentials and a coherent field theory derived quantum mechanical scheme to calculate the properties of bound states made by two or more heavy quarks. In this framework heavy quarkonium properties depend only on the QCD parameters (quark masses and $\als$) and nonpotential corrections are systematically accounted for. The relation between the form of the nonperturbative potentials and the low energy QCD dynamics is also discussed. |
hep-ph/0602130 | Zenro Hioki | Bohdan Grzadkowski (Warsaw U.), Zenro Hioki (U. Tokushima), Kazumasa
Ohkuma (Fukui U. Tech.), Jose Wudka (UC Riverside) | New-Physics Search through gamma gamma -> t tbar -> lX/bX | LaTeX_2e, 10 pages, Talk presented by K. Ohkuma at the 7th
International Symposium on Radiative Corrections (RADCOR2005), Shonan
Village, Japan, October 2-7, 2005 | null | 10.1016/j.nuclphysbps.2006.03.028 | IFT-03-06, FUT-06-01, UCRHEP-T404 | hep-ph hep-ex | null | We probe optimal beam polarizations for new-physics search in top-quark and
Higgs-boson sectors at Photon Linear Colliders (PLC). Expressing possible
non-standard effects generated by SU(2)xU(1) gauge-invariant dimension-6
effective operators as anomalous top and Higgs couplings, we estimate expected
statistical sensitivities of these couplings in gamma gamma -> t tbar -> lX/bX,
using the optimal-observable method.
| [
{
"created": "Wed, 15 Feb 2006 03:29:17 GMT",
"version": "v1"
}
] | 2012-07-04 | [
[
"Grzadkowski",
"Bohdan",
"",
"Warsaw U."
],
[
"Hioki",
"Zenro",
"",
"U. Tokushima"
],
[
"Ohkuma",
"Kazumasa",
"",
"Fukui U. Tech."
],
[
"Wudka",
"Jose",
"",
"UC Riverside"
]
] | We probe optimal beam polarizations for new-physics search in top-quark and Higgs-boson sectors at Photon Linear Colliders (PLC). Expressing possible non-standard effects generated by SU(2)xU(1) gauge-invariant dimension-6 effective operators as anomalous top and Higgs couplings, we estimate expected statistical sensitivities of these couplings in gamma gamma -> t tbar -> lX/bX, using the optimal-observable method. |
1302.0669 | Mamoru Matsunaga | Takaaki Hashimoto, Mamoru Matsunaga, and Kenta Yamamoto (Department of
Physics Engineering, Mie University) | Quantization of hypercharge in gauge groups locally isomorphic but
globally nonisomorphic to SU(3)_c X SU(2)_L X U(1)_Y | 5 pages; typos fixed; to be published in Phys. Rev. D | null | 10.1103/PhysRevD.87.077701 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the Standard Model the hypercharges of quarks and leptons are not
determined by the gauge group itself. In a recent paper [C. Hattori et al.
Phys. Rev. D83, 015009 (2011)] it is shown that, if the direct product gauge
group G_SM is slightly modified to the semidirect product group G'_SM,
hypercharges are restricted to quantized values as n/6 mod Z (n = 0,1,3,4). In
this brief paper, we examine all of the compact Lie groups locally isomorphic
to G_SM, and show that G'_SM (or its isomorphisms) is the unique possibility
that yields the correct hypercharge quantization.
| [
{
"created": "Mon, 4 Feb 2013 12:38:35 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Apr 2013 11:23:52 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Hashimoto",
"Takaaki",
"",
"Department of\n Physics Engineering, Mie University"
],
[
"Matsunaga",
"Mamoru",
"",
"Department of\n Physics Engineering, Mie University"
],
[
"Yamamoto",
"Kenta",
"",
"Department of\n Physics Engineering, Mie University"
]... | In the Standard Model the hypercharges of quarks and leptons are not determined by the gauge group itself. In a recent paper [C. Hattori et al. Phys. Rev. D83, 015009 (2011)] it is shown that, if the direct product gauge group G_SM is slightly modified to the semidirect product group G'_SM, hypercharges are restricted to quantized values as n/6 mod Z (n = 0,1,3,4). In this brief paper, we examine all of the compact Lie groups locally isomorphic to G_SM, and show that G'_SM (or its isomorphisms) is the unique possibility that yields the correct hypercharge quantization. |
hep-ph/0311238 | Aurelien Barrau | A. Barrau, J. Grain, S.O. Alexeyev | Gauss-Bonnet Black Holes at the LHC : Beyond the Dimensionality of Space | Accepted by Phys. Lett. B | Phys.Lett.B584:114,2004 | 10.1016/j.physletb.2004.01.019 | null | hep-ph astro-ph gr-qc hep-ex hep-th | null | The Gauss - Bonnet invariant is one of the most promising candidates for a
quadratic curvature correction to the Einstein action in expansions of
supersymmetric string theory. We study the evaporation of such Schwarzschild -
Gauss - Bonnet black holes which could be formed at future colliders if the
Planck scale is of order a TeV, as predicted by some modern brane world models.
We show that, beyond the dimensionality of space, the corresponding coupling
constant could be measured by the LHC. This opens new windows for physics
investigation in spite of the possible screening of microphysics due to the
event horizon.
| [
{
"created": "Wed, 19 Nov 2003 19:21:20 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Jan 2004 11:02:34 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Barrau",
"A.",
""
],
[
"Grain",
"J.",
""
],
[
"Alexeyev",
"S. O.",
""
]
] | The Gauss - Bonnet invariant is one of the most promising candidates for a quadratic curvature correction to the Einstein action in expansions of supersymmetric string theory. We study the evaporation of such Schwarzschild - Gauss - Bonnet black holes which could be formed at future colliders if the Planck scale is of order a TeV, as predicted by some modern brane world models. We show that, beyond the dimensionality of space, the corresponding coupling constant could be measured by the LHC. This opens new windows for physics investigation in spite of the possible screening of microphysics due to the event horizon. |
0904.2296 | Schoeffel Laurent | Laurent Schoeffel | New measurement of charge asymmetry $x{F}_3$ from HERA | 4 pages, 3 figures, proceedings of the International Workshop on
Positrons at Jefferson Lab (March 25-27, 2009), Thomas Jefferson National
Accelerator Facility, Newport News, VA | null | 10.1063/1.3232034 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After presenting the recent measurements of neutral current cross section in
DIS at HERA, we explain the effect of the $\gamma-Z_0$ interference at the
electro-weak scale, visible on these data. Then, the beam charge difference
$x{F}_3$ is measured and the interference itself is extracted. Results are
discussed in the context of perturbative QCD.
| [
{
"created": "Wed, 15 Apr 2009 12:38:54 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Schoeffel",
"Laurent",
""
]
] | After presenting the recent measurements of neutral current cross section in DIS at HERA, we explain the effect of the $\gamma-Z_0$ interference at the electro-weak scale, visible on these data. Then, the beam charge difference $x{F}_3$ is measured and the interference itself is extracted. Results are discussed in the context of perturbative QCD. |
hep-ph/9506418 | null | A. Hebecker | The Electroweak Phase Transition | Ph.D. thesis, 70 pages LaTeX, figures not included, complete ps-file
or hardcopy available from the Author | null | null | DESY T-95-02 | hep-ph | null | The electroweak phase transition is investigated by means of the
perturbatively calculated high temperature effective potential. An analytic
result to order $g^4,\lambda^2$ is presented for the Abelian Higgs model, the
SU(2)-Higgs model and the standard model and a complete on-shell
renormalization at zero temperature is performed. Higher order corrections are
found to increase the strength of the first order phase transition in the
non-Abelian model, opposite to the Abelian case. This effect is traced back to
the infrared contributions from the typical non-Abelian diagrams. The
dependence of several phase transition parameters on the Higgs mass is analysed
in detail. A new, gauge invariant, approach based on the composite field
$\Phi^\dagger\Phi$ is introduced. This method, which supports the above Landau
gauge results numerically, permits a conceptually simpler treatment of the
thermodynamics of the phase transition. In particular, it enables a
straightforward comparison with lattice data and the application of the
Clausius-Clapeyron equation to the electroweak phase transition.
| [
{
"created": "Sun, 25 Jun 1995 10:21:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hebecker",
"A.",
""
]
] | The electroweak phase transition is investigated by means of the perturbatively calculated high temperature effective potential. An analytic result to order $g^4,\lambda^2$ is presented for the Abelian Higgs model, the SU(2)-Higgs model and the standard model and a complete on-shell renormalization at zero temperature is performed. Higher order corrections are found to increase the strength of the first order phase transition in the non-Abelian model, opposite to the Abelian case. This effect is traced back to the infrared contributions from the typical non-Abelian diagrams. The dependence of several phase transition parameters on the Higgs mass is analysed in detail. A new, gauge invariant, approach based on the composite field $\Phi^\dagger\Phi$ is introduced. This method, which supports the above Landau gauge results numerically, permits a conceptually simpler treatment of the thermodynamics of the phase transition. In particular, it enables a straightforward comparison with lattice data and the application of the Clausius-Clapeyron equation to the electroweak phase transition. |
0812.3262 | Emidio Gabrielli | G. Degrassi, E. Gabrielli, and L. Trentadue | Flavor Changing Fermion-Graviton Vertices | 21 pages, 2 figures. New results and two references added. To be
published in PRD | Phys.Rev.D79:053004,2009 | 10.1103/PhysRevD.79.053004 | null | hep-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the flavor-changing quark-graviton vertex that is induced at the
one-loop level when gravitational interactions are coupled to the standard
model. Because of the conservation of the energy-momentum tensor the
corresponding form factors turn out to be finite and gauge-invariant.
Analytical expressions of the form factors are provided at leading order in the
external masses. We show that flavor-changing interactions in gravity are local
if the graviton is strictly massless while if the graviton has a small mass
long-range interactions inducing a flavor-changing contribution in the Newton
potential appear. Flavor-changing processes with massive spin-2 particles are
also briefly discussed. These results can be generalized to the case of the
lepton-graviton coupling.
| [
{
"created": "Wed, 17 Dec 2008 11:33:45 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Mar 2009 09:12:00 GMT",
"version": "v2"
}
] | 2009-03-24 | [
[
"Degrassi",
"G.",
""
],
[
"Gabrielli",
"E.",
""
],
[
"Trentadue",
"L.",
""
]
] | We study the flavor-changing quark-graviton vertex that is induced at the one-loop level when gravitational interactions are coupled to the standard model. Because of the conservation of the energy-momentum tensor the corresponding form factors turn out to be finite and gauge-invariant. Analytical expressions of the form factors are provided at leading order in the external masses. We show that flavor-changing interactions in gravity are local if the graviton is strictly massless while if the graviton has a small mass long-range interactions inducing a flavor-changing contribution in the Newton potential appear. Flavor-changing processes with massive spin-2 particles are also briefly discussed. These results can be generalized to the case of the lepton-graviton coupling. |
1404.3387 | Anatoly Efremov | A.V. Efremov and J. Soffer | An analytical review of DSPIN-13 | 5 pages, no figures. Some chenges and correction in text. arXiv admin
note: text overlap with arXiv:1211.0108 | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A short analytical review of XV Workshop on High Energy Spin Physics
(DSPIN-13) is given. All materials of the workshop, including all presented
talks, list of participants and the pdf-file of Proceedings are available on
the site http://theor.jinr.ru/~spin/2013/.
| [
{
"created": "Sun, 13 Apr 2014 14:47:49 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Apr 2014 08:48:35 GMT",
"version": "v2"
}
] | 2014-04-17 | [
[
"Efremov",
"A. V.",
""
],
[
"Soffer",
"J.",
""
]
] | A short analytical review of XV Workshop on High Energy Spin Physics (DSPIN-13) is given. All materials of the workshop, including all presented talks, list of participants and the pdf-file of Proceedings are available on the site http://theor.jinr.ru/~spin/2013/. |
2306.12382 | Vivek Tiwari Kumar | Suraj Kumar Rai and Vivek Kumar Tiwari | Phase structure of the on-shell parametrized 2+1 flavor Polyakov
quark-meson model | 28 pages, 20 Figures. arXiv admin note: text overlap with
arXiv:2211.11686, arXiv:2305.16180 | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | Augmenting the improved chiral effective potential of the on-shell
renormalized 2+1 flavour quark-meson (RQM) model with the Polyakov-loop
potential that accounts for the deconfinement transition,~we get the Quantum
Chromodynamics (QCD) like framework of the renormalized Polyakov quark-meson
(RPQM) model.~When the divergent quark one-loop vacuum term is included in the
effective potential of the quark-meson (QM) model,~its tree level parameters or
the parameters fixed by the use of meson curvature masses,~become inconsistent
as the curvature masses involve the self energy evaluations at zero
momentum.~Using the modified minimal subtraction method,~the consistent chiral
effective potential for the RQM model has been calculated after relating the
counterterms in the on-shell (OS) scheme to those in the $\overline{\text{MS}}$
scheme and finding the relations between the renormalized parameters of both
the schemes where the physical (pole) masses of the $\pi, K, \eta$ and
$\eta^{\prime}$ pseudo-scalar mesons and the scalar $\sigma$ meson,~the pion
and kaon decay constants,~have been put into the relation of the running
couplings and mass parameter.~Using the RPQM model and the PQM Model with
different forms for the Polyakov-loop potentials in the presence or the absence
of the quark back-reaction,~we have computed and compared the effect of the
consistent quark one-loop correction and the quark back-reaction on the scaled
chiral order parameter,~the QCD phase diagrams and the different thermodynamic
quantities.~The results have been compared with the 2+1 flavor lattice QCD data
from the Wuppertal-Budapest collaboration \{JHEP 09,73(2010); PLB
730,99(2014)\} and the HotQCD collaboration \{PRD 90,094503(2014)\}.
| [
{
"created": "Wed, 21 Jun 2023 17:02:01 GMT",
"version": "v1"
}
] | 2023-06-22 | [
[
"Rai",
"Suraj Kumar",
""
],
[
"Tiwari",
"Vivek Kumar",
""
]
] | Augmenting the improved chiral effective potential of the on-shell renormalized 2+1 flavour quark-meson (RQM) model with the Polyakov-loop potential that accounts for the deconfinement transition,~we get the Quantum Chromodynamics (QCD) like framework of the renormalized Polyakov quark-meson (RPQM) model.~When the divergent quark one-loop vacuum term is included in the effective potential of the quark-meson (QM) model,~its tree level parameters or the parameters fixed by the use of meson curvature masses,~become inconsistent as the curvature masses involve the self energy evaluations at zero momentum.~Using the modified minimal subtraction method,~the consistent chiral effective potential for the RQM model has been calculated after relating the counterterms in the on-shell (OS) scheme to those in the $\overline{\text{MS}}$ scheme and finding the relations between the renormalized parameters of both the schemes where the physical (pole) masses of the $\pi, K, \eta$ and $\eta^{\prime}$ pseudo-scalar mesons and the scalar $\sigma$ meson,~the pion and kaon decay constants,~have been put into the relation of the running couplings and mass parameter.~Using the RPQM model and the PQM Model with different forms for the Polyakov-loop potentials in the presence or the absence of the quark back-reaction,~we have computed and compared the effect of the consistent quark one-loop correction and the quark back-reaction on the scaled chiral order parameter,~the QCD phase diagrams and the different thermodynamic quantities.~The results have been compared with the 2+1 flavor lattice QCD data from the Wuppertal-Budapest collaboration \{JHEP 09,73(2010); PLB 730,99(2014)\} and the HotQCD collaboration \{PRD 90,094503(2014)\}. |
hep-ph/9704371 | Ola Tornkvist | Antonio Riotto, Ola Tornkvist (Fermilab) | CP-Violating Solitons in the Minimal Supersymmetric Standard Model | revtex, 21 pages, 2 postscript figures, uses epsf.tex, aps.sty,
prl.sty, preprint.sty | Phys. Rev. D 56, 3917 (1997) | 10.1103/PhysRevD.56.3917 | FERMILAB-Pub-97/102-A | hep-ph | null | We study non-topological and CP-violating static wall solutions in the
framework of the Minimal Supersymmetric Standard Model. We show that such
membranes, characterized by a non-trivial winding of the relative $U(1)$ phase
of the two Higgs fields in the direction orthogonal to the wall, exist for
small values of the mass of the CP-odd Higgs boson when loop corrections to the
Higgs potential are included. Although their present-day existence is excluded
by experimental bounds, we argue why they may have existed in the early
universe with important cosmological consequences.
| [
{
"created": "Mon, 21 Apr 1997 23:01:33 GMT",
"version": "v1"
}
] | 2016-08-25 | [
[
"Riotto",
"Antonio",
"",
"Fermilab"
],
[
"Tornkvist",
"Ola",
"",
"Fermilab"
]
] | We study non-topological and CP-violating static wall solutions in the framework of the Minimal Supersymmetric Standard Model. We show that such membranes, characterized by a non-trivial winding of the relative $U(1)$ phase of the two Higgs fields in the direction orthogonal to the wall, exist for small values of the mass of the CP-odd Higgs boson when loop corrections to the Higgs potential are included. Although their present-day existence is excluded by experimental bounds, we argue why they may have existed in the early universe with important cosmological consequences. |
hep-ph/0510236 | Sabine Hossenfelder | S. Hossenfelder | News about TeV-scale Black Holes | Talk given at the Quark Matter 2005, Budapest, Hungary, Aug. 2005 | Nucl.Phys. A774 (2006) 865-868 | 10.1016/j.nuclphysa.2006.06.153 | null | hep-ph | null | Collider produced black holes are the most exciting prediction from models
with large extra dimensions. These black holes exist in an extreme region, in
which gravity meets quantum field theory, particle physics, and thermodynamics.
An investigation of the formation and decay processes can therefore provide us
with important insights about the underlying theory and open a window to the
understanding of Physics at the Planck scale. The production and the
evaporation of TeV-scale black holes yields distinct signatures that have been
examined closely during the last years, with analytical approaches as well as
by use of numerical simulations. I present new results for the LHC, which take
into account that, instead of a final decay, a black hole remnant can be left.
This is a summary of the talk given at the Quark Matter 2005, Budapest,
Hungary, Aug. 2005.
| [
{
"created": "Tue, 18 Oct 2005 19:12:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hossenfelder",
"S.",
""
]
] | Collider produced black holes are the most exciting prediction from models with large extra dimensions. These black holes exist in an extreme region, in which gravity meets quantum field theory, particle physics, and thermodynamics. An investigation of the formation and decay processes can therefore provide us with important insights about the underlying theory and open a window to the understanding of Physics at the Planck scale. The production and the evaporation of TeV-scale black holes yields distinct signatures that have been examined closely during the last years, with analytical approaches as well as by use of numerical simulations. I present new results for the LHC, which take into account that, instead of a final decay, a black hole remnant can be left. This is a summary of the talk given at the Quark Matter 2005, Budapest, Hungary, Aug. 2005. |
2208.12430 | Adriana G. Menkara | Seong-Sik Kim, Hyun Min Lee, Adriana G. Menkara, Kimiko Yamashita | The $SU(2)_D$ lepton portals for muon $g-2$, $W$ boson mass and dark
matter | 6 pages, 2 figures, Proceeding for IDM 2022, 14th International
Conference on Identification of Dark Matter, Vienna, Austria | null | null | null | hep-ph | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We propose a novel model which extends the Standard Model (SM) by introducing
a $SU(2)_D$ gauge symmetry. In this model, a dark $SU(2)_D$ Higgs doublet and a
Higgs bi-doublet can contribute to the muon $g-2$ anomaly and the $W$ boson
mass, remaining in tune with the recent experimental results. At the same time,
the isospin charged gauge boson of $SU(2)_D$ becomes a plausible candidate for
Dark Matter(DM). We find that the resulting parameter space can fit the muon
$g-2$, the $W$ boson mass and the DM constraints simultaneously.
| [
{
"created": "Fri, 26 Aug 2022 04:08:38 GMT",
"version": "v1"
}
] | 2022-08-29 | [
[
"Kim",
"Seong-Sik",
""
],
[
"Lee",
"Hyun Min",
""
],
[
"Menkara",
"Adriana G.",
""
],
[
"Yamashita",
"Kimiko",
""
]
] | We propose a novel model which extends the Standard Model (SM) by introducing a $SU(2)_D$ gauge symmetry. In this model, a dark $SU(2)_D$ Higgs doublet and a Higgs bi-doublet can contribute to the muon $g-2$ anomaly and the $W$ boson mass, remaining in tune with the recent experimental results. At the same time, the isospin charged gauge boson of $SU(2)_D$ becomes a plausible candidate for Dark Matter(DM). We find that the resulting parameter space can fit the muon $g-2$, the $W$ boson mass and the DM constraints simultaneously. |
hep-ph/9911498 | Palash Baran Pal | Kaushik Bhattacharya and Palash B. Pal | Inverse beta-decay in magnetic fields | 14 pages, LateX, with 3 embeded figures using epsf.sty | null | null | SINP/TNP/99-33 | hep-ph | null | We calculate the cross section of the inverse beta decay process, $\nu_e+n\to
p+e$, in a magnetic field which is much smaller than $m_p^2/e$. Using exact
solutions of the Dirac equation in a constant magnetic field, we find that the
cross section depends on the direction of the incident neutrino even when the
initial neutron is assumed to be at rest. We discuss the implication of this
result for pulsar kicks.
| [
{
"created": "Fri, 26 Nov 1999 06:53:49 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Apr 2000 09:14:15 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Bhattacharya",
"Kaushik",
""
],
[
"Pal",
"Palash B.",
""
]
] | We calculate the cross section of the inverse beta decay process, $\nu_e+n\to p+e$, in a magnetic field which is much smaller than $m_p^2/e$. Using exact solutions of the Dirac equation in a constant magnetic field, we find that the cross section depends on the direction of the incident neutrino even when the initial neutron is assumed to be at rest. We discuss the implication of this result for pulsar kicks. |
0908.1968 | Eduardo Pont\'on | Hooman Davoudiasl, Shrihari Gopalakrishna, Eduardo Ponton, Jose
Santiago | Warped 5-Dimensional Models: Phenomenological Status and Experimental
Prospects | References added. To appear in the focus issue on Extra Space
Dimensions of the New Journal of Physics | New J.Phys.12:075011,2010 | 10.1088/1367-2630/12/7/075011 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Warped 5-dimensional models, based on the original Randall-Sundrum geometry,
have been extended beyond their initial purpose of resolving the gauge
hierarchy problem. Over the past decade, various ingredients have been added to
their basic structure in order to provide natural and predictive models of
flavor and also to address existing constraints from precision data. In this
review, we examine the theoretical and experimental status of realistic models
that accommodate current data, while addressing the hierarchy and flavor
puzzles of the Standard Model. We also discuss the prospects for future
discovery of the TeV-scale Kaluza-Klein states that are predicted to emerge in
these models, and outline some of the challenges that the detection of such
particles pose for experiments at the Large Hadron Collider.
| [
{
"created": "Thu, 13 Aug 2009 20:11:23 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Oct 2009 01:12:13 GMT",
"version": "v2"
}
] | 2011-01-03 | [
[
"Davoudiasl",
"Hooman",
""
],
[
"Gopalakrishna",
"Shrihari",
""
],
[
"Ponton",
"Eduardo",
""
],
[
"Santiago",
"Jose",
""
]
] | Warped 5-dimensional models, based on the original Randall-Sundrum geometry, have been extended beyond their initial purpose of resolving the gauge hierarchy problem. Over the past decade, various ingredients have been added to their basic structure in order to provide natural and predictive models of flavor and also to address existing constraints from precision data. In this review, we examine the theoretical and experimental status of realistic models that accommodate current data, while addressing the hierarchy and flavor puzzles of the Standard Model. We also discuss the prospects for future discovery of the TeV-scale Kaluza-Klein states that are predicted to emerge in these models, and outline some of the challenges that the detection of such particles pose for experiments at the Large Hadron Collider. |
1511.05561 | Stefano Forte | Stefano Forte and Claudio Muselli | High energy resummation of transverse momentum distributions:Higgs in
gluon fusion | 28 pages, 6 figures, Final version published in JHEP: several typos
corrected (including in equations) | null | 10.1007/JHEP03(2016)122 | TIF-UNIMI-2015-18 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a general resummation formula for transverse-momentum distributions
of hard processes at the leading logarithmic level in the high-energy limit, to
all orders in the strong coupling. Our result is based on a suitable
generalization of high-energy factorization theorems, whereby all-order
resummation is reduced to the determination of the Born-level process but with
incoming off-shell gluons. We validate our formula by applying it to Higgs
production in gluon fusion in the infinite top mass limit. We check our result
up to next-to-leading order by comparison to the high energy limit of the exact
expression and to next-to-next-to leading by comparison to NNLL order trasverse
momentum (Sudakov) resummation, and we predict the high-energy behaviour at
next$^3$-to-leading order. We also show that the structure of the result in the
small transverse momentum limit agrees to all orders with general constraints
from Sudakov resummation.
| [
{
"created": "Tue, 17 Nov 2015 21:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jun 2016 15:55:56 GMT",
"version": "v2"
}
] | 2016-06-17 | [
[
"Forte",
"Stefano",
""
],
[
"Muselli",
"Claudio",
""
]
] | We derive a general resummation formula for transverse-momentum distributions of hard processes at the leading logarithmic level in the high-energy limit, to all orders in the strong coupling. Our result is based on a suitable generalization of high-energy factorization theorems, whereby all-order resummation is reduced to the determination of the Born-level process but with incoming off-shell gluons. We validate our formula by applying it to Higgs production in gluon fusion in the infinite top mass limit. We check our result up to next-to-leading order by comparison to the high energy limit of the exact expression and to next-to-next-to leading by comparison to NNLL order trasverse momentum (Sudakov) resummation, and we predict the high-energy behaviour at next$^3$-to-leading order. We also show that the structure of the result in the small transverse momentum limit agrees to all orders with general constraints from Sudakov resummation. |
2003.11438 | Victor Goncalves | V. P. Goncalves, B. D. Moreira | A phenomenological analysis of the nonperturbative QCD contributions for
the photon wave function | 8 pages, 6 figures. Improved version to be published in European
Physical Journal C | null | 10.1140/epjc/s10052-020-8043-2 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The photon -- induced interactions, present in $ep$, $eA$, $pp$, $pA$, $AA$
and $e^+ e^-$ collisions, are expressed within the color dipole approach in
terms of the photon wave function, which describes the transition of the photon
into a quark -- antiquark color dipole. Such quantity is usually calculated
using perturbation theory assuming that long distance corrections associated to
strong interactions can be neglected. In this paper we investigate the impact
of these nonperturbative QCD (npQCD) corrections to the description of the
photon wave function for dipoles of large size in several observables measured
at HERA, LEP and LHC. We assume a phenomenological ansatz for the treatment of
these npQCD corrections and constrain the free parameters of our model using
the experimental data for the photoproduction cross section. The predictions
for the $\gamma \gamma$ cross section, exclusive $\rho$ production in $ep$
collisions and the rapidity distribution for the $\rho$ production in $PbPb$
collisions are compared with the data. We demonstrate that the inclusion of the
nonperturbative QCD corrections improves the description of processes that are
dominated by large dipoles.
| [
{
"created": "Wed, 25 Mar 2020 15:02:37 GMT",
"version": "v1"
},
{
"created": "Wed, 13 May 2020 15:24:58 GMT",
"version": "v2"
}
] | 2020-06-24 | [
[
"Goncalves",
"V. P.",
""
],
[
"Moreira",
"B. D.",
""
]
] | The photon -- induced interactions, present in $ep$, $eA$, $pp$, $pA$, $AA$ and $e^+ e^-$ collisions, are expressed within the color dipole approach in terms of the photon wave function, which describes the transition of the photon into a quark -- antiquark color dipole. Such quantity is usually calculated using perturbation theory assuming that long distance corrections associated to strong interactions can be neglected. In this paper we investigate the impact of these nonperturbative QCD (npQCD) corrections to the description of the photon wave function for dipoles of large size in several observables measured at HERA, LEP and LHC. We assume a phenomenological ansatz for the treatment of these npQCD corrections and constrain the free parameters of our model using the experimental data for the photoproduction cross section. The predictions for the $\gamma \gamma$ cross section, exclusive $\rho$ production in $ep$ collisions and the rapidity distribution for the $\rho$ production in $PbPb$ collisions are compared with the data. We demonstrate that the inclusion of the nonperturbative QCD corrections improves the description of processes that are dominated by large dipoles. |
2203.12169 | Emanuele Mereghetti | Vincenzo Cirigliano, Zohreh Davoudi, Wouter Dekens, Jordy de Vries,
Jonathan Engel, Xu Feng, Julia Gehrlein, Michael L. Graesser, Luk\'a\v{s}
Gr\'af, Heiko Hergert, Luchang Jin, Emanuele Mereghetti, Amy Nicholson, Saori
Pastore, Michael J. Ramsey-Musolf, Richard Ruiz, Martin Spinrath, Ubirajara
van Kolck and Andr\'e Walker-Loud | Neutrinoless Double-Beta Decay: A Roadmap for Matching Theory to
Experiment | Contribution to Snowmass 2021 | null | null | LA-UR-22-22587 | hep-ph hep-ex hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observation of neutrino oscillations and hence non-zero neutrino masses
provided a milestone in the search for physics beyond the Standard Model. But
even though we now know that neutrinos are massive, the nature of neutrino
masses, i.e., whether they are Dirac or Majorana, remains an open question. A
smoking-gun signature of Majorana neutrinos is the observation of neutrinoless
double-beta decay, a process that violates the lepton-number conservation of
the Standard Model. This white paper focuses on the theoretical aspects of the
neutrinoless double-beta decay program and lays out a roadmap for future
developments. The roadmap is a multi-scale path starting from high-energy
models of neutrinoless double-beta decay all the way to the low-energy nuclear
many-body problem that needs to be solved to supplement measurements of the
decay rate. The path goes through a systematic effective-field-theory
description of the underlying processes at various scales and needs to be
supplemented by lattice quantum chromodynamics input. The white paper also
discusses the interplay between neutrinoless double-beta decay, experiments at
the Large Hadron Collider and results from astrophysics and cosmology in
probing simplified models of lepton-number violation at the TeV scale, and the
generation of the matter-antimatter asymmetry via leptogenesis. This white
paper is prepared for the topical groups TF11 (Theory of Neutrino Physics),
TF05 (Lattice Gauge Theory), RF04 (Baryon and Lepton Number Violating
Processes), NF03 (Beyond the Standard Model) and NF05 (Neutrino Properties)
within the Theory Frontier, Rare Processes and Precision Frontier, and Neutrino
Physics Frontier of the U.S. Community Study on the Future of Particle Physics
(Snowmass 2021).
| [
{
"created": "Wed, 23 Mar 2022 03:26:30 GMT",
"version": "v1"
}
] | 2022-03-24 | [
[
"Cirigliano",
"Vincenzo",
""
],
[
"Davoudi",
"Zohreh",
""
],
[
"Dekens",
"Wouter",
""
],
[
"de Vries",
"Jordy",
""
],
[
"Engel",
"Jonathan",
""
],
[
"Feng",
"Xu",
""
],
[
"Gehrlein",
"Julia",
""
],
[
... | The observation of neutrino oscillations and hence non-zero neutrino masses provided a milestone in the search for physics beyond the Standard Model. But even though we now know that neutrinos are massive, the nature of neutrino masses, i.e., whether they are Dirac or Majorana, remains an open question. A smoking-gun signature of Majorana neutrinos is the observation of neutrinoless double-beta decay, a process that violates the lepton-number conservation of the Standard Model. This white paper focuses on the theoretical aspects of the neutrinoless double-beta decay program and lays out a roadmap for future developments. The roadmap is a multi-scale path starting from high-energy models of neutrinoless double-beta decay all the way to the low-energy nuclear many-body problem that needs to be solved to supplement measurements of the decay rate. The path goes through a systematic effective-field-theory description of the underlying processes at various scales and needs to be supplemented by lattice quantum chromodynamics input. The white paper also discusses the interplay between neutrinoless double-beta decay, experiments at the Large Hadron Collider and results from astrophysics and cosmology in probing simplified models of lepton-number violation at the TeV scale, and the generation of the matter-antimatter asymmetry via leptogenesis. This white paper is prepared for the topical groups TF11 (Theory of Neutrino Physics), TF05 (Lattice Gauge Theory), RF04 (Baryon and Lepton Number Violating Processes), NF03 (Beyond the Standard Model) and NF05 (Neutrino Properties) within the Theory Frontier, Rare Processes and Precision Frontier, and Neutrino Physics Frontier of the U.S. Community Study on the Future of Particle Physics (Snowmass 2021). |
1309.1934 | Sayantan Choudhury | Sayantan Choudhury, Arnab Dasgupta | Galileogenesis: A new cosmophenomenological zip code for reheating
through R-parity violating coupling | 8 pages, 2 figures, Revision accepted by Nuclear Physics B | Nucl. Phys. B 882 (2014) pp. 195-204 | 10.1016/j.nuclphysb.2014.02.024 | null | hep-ph astro-ph.CO gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we introduce an idea of leptogenesis scenario in higher
derivative gravity induced DBI Galileon framework {\it aka Galileogenesis} in
presence of one-loop R-parity violating couplings in the background of a low
energy effective supergravity setup. We have studied extensively the detailed
feature of reheating constraints and the cosmophenomenological consequences of
thermal gravitino dark matter in light of PLANCK and PDG data. Finally we have
also established a direct cosmological connection among dark matter relic
abundance, reheating temperature and tensor-to-scalar ratio in the context of
DBI Galileon inflation.
| [
{
"created": "Sun, 8 Sep 2013 07:32:19 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Feb 2014 16:53:45 GMT",
"version": "v2"
}
] | 2014-03-20 | [
[
"Choudhury",
"Sayantan",
""
],
[
"Dasgupta",
"Arnab",
""
]
] | In this paper we introduce an idea of leptogenesis scenario in higher derivative gravity induced DBI Galileon framework {\it aka Galileogenesis} in presence of one-loop R-parity violating couplings in the background of a low energy effective supergravity setup. We have studied extensively the detailed feature of reheating constraints and the cosmophenomenological consequences of thermal gravitino dark matter in light of PLANCK and PDG data. Finally we have also established a direct cosmological connection among dark matter relic abundance, reheating temperature and tensor-to-scalar ratio in the context of DBI Galileon inflation. |
1911.00328 | Vedran Brdar | Cristina Benso, Vedran Brdar, Manfred Lindner, Werner Rodejohann | Prospects for Finding Sterile Neutrino Dark Matter at KATRIN | error in rescaling X-ray limits fixed; conclusions unchanged | Phys. Rev. D 100, 115035 (2019) | 10.1103/PhysRevD.100.115035 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss under what circumstances a signal in upcoming laboratory searches
for keV-scale sterile neutrinos would be compatible with those particles being
a sizable part or all of dark matter. In the parameter space that will be
experimentally accessible by KATRIN/TRISTAN, strong X-ray limits need to be
relaxed and dark matter overproduction needs to be avoided. We discuss
postponing the dark matter production to lower temperatures, a reduced sterile
neutrino contribution to dark matter, and a reduction of the branching ratio in
photons and active neutrinos through cancellation with a new physics diagram.
Both the Dodelson-Widrow and the Shi-Fuller mechanisms for sterile neutrino
dark matter production are considered. As a final exotic example, potential
consequences of CPT violation are discussed.
| [
{
"created": "Fri, 1 Nov 2019 12:25:46 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Dec 2019 19:14:35 GMT",
"version": "v2"
},
{
"created": "Fri, 24 Dec 2021 17:55:08 GMT",
"version": "v3"
}
] | 2021-12-28 | [
[
"Benso",
"Cristina",
""
],
[
"Brdar",
"Vedran",
""
],
[
"Lindner",
"Manfred",
""
],
[
"Rodejohann",
"Werner",
""
]
] | We discuss under what circumstances a signal in upcoming laboratory searches for keV-scale sterile neutrinos would be compatible with those particles being a sizable part or all of dark matter. In the parameter space that will be experimentally accessible by KATRIN/TRISTAN, strong X-ray limits need to be relaxed and dark matter overproduction needs to be avoided. We discuss postponing the dark matter production to lower temperatures, a reduced sterile neutrino contribution to dark matter, and a reduction of the branching ratio in photons and active neutrinos through cancellation with a new physics diagram. Both the Dodelson-Widrow and the Shi-Fuller mechanisms for sterile neutrino dark matter production are considered. As a final exotic example, potential consequences of CPT violation are discussed. |
hep-ph/0006112 | Zhi-Zhong Xing | Zhi-zhong Xing | Can CPT Symmetry Be Tested With K^0 vs \bar{K}^0--> \pi^+\pi^-\pi^0
Decays? | RevTex 6 pages. Phys. Rev. D (in printing) | Phys.Rev. D62 (2000) 097901 | 10.1103/PhysRevD.62.097901 | LMU-00-06 | hep-ph hep-ex | null | We show that the CP-violating effect in K^0 vs \bar K^0-->\pi^+\pi^-\pi^0
decays differs from that in K_{\rm L}-->\pi^+\pi^-, K_{\rm L}-->\pi^0\pi^0 or
the semileptonic K_{\rm L} transitions, if there exists CPT violation in
K^0-\bar{K}^0 mixing. A delicate measurement of this difference in the KTeV
experiment and at the \phi factory will provide a new test of CPT symmetry in
the neutral kaon system.
| [
{
"created": "Mon, 12 Jun 2000 09:36:42 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jul 2000 13:54:16 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Xing",
"Zhi-zhong",
""
]
] | We show that the CP-violating effect in K^0 vs \bar K^0-->\pi^+\pi^-\pi^0 decays differs from that in K_{\rm L}-->\pi^+\pi^-, K_{\rm L}-->\pi^0\pi^0 or the semileptonic K_{\rm L} transitions, if there exists CPT violation in K^0-\bar{K}^0 mixing. A delicate measurement of this difference in the KTeV experiment and at the \phi factory will provide a new test of CPT symmetry in the neutral kaon system. |
2106.02059 | Davide Pagani | Davide Pagani, Hua-Sheng Shao, Ioannis Tsinikos, Marco Zaro | Automated EW corrections with isolated photons: $t \bar t \gamma$, $t
\bar t \gamma\gamma$ and $t \gamma j$ as case studies | 32 pages, 4 figures, 5 tables. This version matches the one published | JHEP09(2021)155 | 10.1007/JHEP09(2021)155 | DESY 21-083, LU-TP 21-19, TIF-UNIMI-2021-7 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we compute for the first time the so-called Complete-NLO
predictions for top-quark pair hadroproduction in association with at least one
isolated photon ($ t \bar t \gamma$). We also compute NLO QCD+EW predictions
for the similar case with at least two isolated photons ($ t \bar t
\gamma\gamma$) and for single-top hadroproduction in association with at least
one isolated photon. In addition, we complement our results with NLO QCD+EW
predictions of the hadronic and leptonic decays of top-quark including an
isolated photon. All these results have been obtained in a completely automated
approach, by extending the capabilities of the MadGraph5_aMC@NLO framework and
enabling the Complete-NLO predictions for processes with isolated photons in
the final state. We discuss the technical details of the implementation, which
involves a mixed EW renormalisation scheme for such processes.
| [
{
"created": "Thu, 3 Jun 2021 18:03:38 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Oct 2021 16:07:47 GMT",
"version": "v2"
}
] | 2021-10-04 | [
[
"Pagani",
"Davide",
""
],
[
"Shao",
"Hua-Sheng",
""
],
[
"Tsinikos",
"Ioannis",
""
],
[
"Zaro",
"Marco",
""
]
] | In this work we compute for the first time the so-called Complete-NLO predictions for top-quark pair hadroproduction in association with at least one isolated photon ($ t \bar t \gamma$). We also compute NLO QCD+EW predictions for the similar case with at least two isolated photons ($ t \bar t \gamma\gamma$) and for single-top hadroproduction in association with at least one isolated photon. In addition, we complement our results with NLO QCD+EW predictions of the hadronic and leptonic decays of top-quark including an isolated photon. All these results have been obtained in a completely automated approach, by extending the capabilities of the MadGraph5_aMC@NLO framework and enabling the Complete-NLO predictions for processes with isolated photons in the final state. We discuss the technical details of the implementation, which involves a mixed EW renormalisation scheme for such processes. |
1604.00925 | Ye-Ling Zhou | Silvia Pascoli and Ye-Ling Zhou | The role of flavon cross couplings in leptonic flavour mixing | 21 pages, 3 figures, typo corrected, published in JHEP | JHEP 06: 073, 2016 | 10.1007/JHEP06(2016)073 | IPPP/16/19 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In models with discrete flavour symmetries, flavons are critical to realise
specific flavour structures. Leptonic flavour mixing originates from the
misalignment of flavon vacuum expectation values which respect different
residual symmetries in the charged lepton and neutrino sectors. Flavon cross
couplings are usually forbidden, in order to protect these symmetries. Contrary
to this approach, we show that cross couplings can play a key role and give
raise to necessary corrections to flavour-mixing patterns, including a non-zero
value for the reactor angle and CP violation. For definiteness, we present two
models based on $A_4$. In the first model, all flavons are assumed to be real
or pseudo-real, with 7 real degrees of freedom in the flavon sector in total. A
sizable reactor angle associated with nearly maximal CP violation is achieved,
and, as both originate from the same cross coupling, a sum rule results with a
precise prediction for the value of the Dirac CP-violating phase. In the second
model, the flavons are taken to be complex scalars, which can be connected with
supersymmetric models and multi-Higgs models. The complexity properties of
flavons provide new sources for generating the reactor angle. Models in this
new approach introduce very few degrees of freedom beyond the Standard Model
and can be more economical than those in the framework of extra dimension or
supersymmetry.
| [
{
"created": "Mon, 4 Apr 2016 16:00:02 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jun 2016 13:52:17 GMT",
"version": "v2"
}
] | 2016-06-14 | [
[
"Pascoli",
"Silvia",
""
],
[
"Zhou",
"Ye-Ling",
""
]
] | In models with discrete flavour symmetries, flavons are critical to realise specific flavour structures. Leptonic flavour mixing originates from the misalignment of flavon vacuum expectation values which respect different residual symmetries in the charged lepton and neutrino sectors. Flavon cross couplings are usually forbidden, in order to protect these symmetries. Contrary to this approach, we show that cross couplings can play a key role and give raise to necessary corrections to flavour-mixing patterns, including a non-zero value for the reactor angle and CP violation. For definiteness, we present two models based on $A_4$. In the first model, all flavons are assumed to be real or pseudo-real, with 7 real degrees of freedom in the flavon sector in total. A sizable reactor angle associated with nearly maximal CP violation is achieved, and, as both originate from the same cross coupling, a sum rule results with a precise prediction for the value of the Dirac CP-violating phase. In the second model, the flavons are taken to be complex scalars, which can be connected with supersymmetric models and multi-Higgs models. The complexity properties of flavons provide new sources for generating the reactor angle. Models in this new approach introduce very few degrees of freedom beyond the Standard Model and can be more economical than those in the framework of extra dimension or supersymmetry. |
hep-ph/0111112 | Andreas Ringwald | A. Ringwald (DESY) | Possible detection of relic neutrinos and their mass | 8 pages, 11 figures, needs icrc.cls (included). Invited so-called
"Highlight Talk", to appear in the Proceedings of the 27th International
Cosmic Ray Conference (ICRC 2001), Hamburg, Germany, August 2001 | null | null | DESY 01-189 | hep-ph astro-ph hep-ex | null | Recently the possibility was widely discussed that a large fraction of the
highest energy cosmic rays may be decay products of Z bosons which were
produced in the resonant annihilation of ultrahigh energy cosmic neutrinos on
cosmological relic neutrinos. If one takes this so-called Z-burst scenario
seriously, one may infer the mass of the heaviest relic neutrino as well as the
necessary ultrahigh energy cosmic neutrino flux from a comparison of the
predicted Z-burst spectrum with the observed cosmic ray spectrum.
| [
{
"created": "Fri, 9 Nov 2001 15:38:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ringwald",
"A.",
"",
"DESY"
]
] | Recently the possibility was widely discussed that a large fraction of the highest energy cosmic rays may be decay products of Z bosons which were produced in the resonant annihilation of ultrahigh energy cosmic neutrinos on cosmological relic neutrinos. If one takes this so-called Z-burst scenario seriously, one may infer the mass of the heaviest relic neutrino as well as the necessary ultrahigh energy cosmic neutrino flux from a comparison of the predicted Z-burst spectrum with the observed cosmic ray spectrum. |
1103.1881 | Sho Iwamoto | Shoji Asai, Yuya Azuma, Motoi Endo, Koichi Hamaguchi, Sho Iwamoto | Stau Kinks at the LHC | 19 pages, 4 figures; Version published in JHEP; abstract refined,
reference added and several minor corrections in text | null | 10.1007/JHEP12(2011)041 | UT-11-06, IPMU-11-0033 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The kink signature of charged tracks is predicted in some SUSY models, and it
is very characteristic signal at collider experiments. We study the kink
signature at LHC using two models, SUSY models with a gravitino LSP and a stau
NLSP, and R-parity violating SUSY models with a stau (N)LSP. We find that a
large number of kink events can be discovered in a wide range of the SUSY
parameters, when the decay length is O(10-10^5)mm. Model discrimination by
identifying the daughter particles of the kink tracks is also discussed.
| [
{
"created": "Wed, 9 Mar 2011 21:01:00 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Dec 2011 18:24:37 GMT",
"version": "v2"
}
] | 2015-05-27 | [
[
"Asai",
"Shoji",
""
],
[
"Azuma",
"Yuya",
""
],
[
"Endo",
"Motoi",
""
],
[
"Hamaguchi",
"Koichi",
""
],
[
"Iwamoto",
"Sho",
""
]
] | The kink signature of charged tracks is predicted in some SUSY models, and it is very characteristic signal at collider experiments. We study the kink signature at LHC using two models, SUSY models with a gravitino LSP and a stau NLSP, and R-parity violating SUSY models with a stau (N)LSP. We find that a large number of kink events can be discovered in a wide range of the SUSY parameters, when the decay length is O(10-10^5)mm. Model discrimination by identifying the daughter particles of the kink tracks is also discussed. |
hep-ph/9406424 | null | Gautam Bhattacharyya, Gustavo C. Branco and Debajyoti Choudhury | Radiative B-decay as a test of CKM unitarity | 11 pages (Latex) + 4 postscript figures (compressed, tared,
uuencoded) included at the end of the paper - [please check before printing
that the uncompressed fig2.ps and fig3.ps files do not contain blank lines in
the beginning], CERN-TH.7294/94, MPI-PhT/94-32 | Phys.Lett.B336:487-493,1994; ERRATUM-ibid.B340:266,1994 | 10.1016/0370-2693(94)90562-2 | null | hep-ph | null | We point out that $R \equiv Br(b\rightarrow d \gamma)/Br(b\rightarrow s
\gamma)$ is a sensitive probe of possible violation of CKM unitarity. We
compute $R$ in a minimal extension of the Standard Model containing an
additional isosinglet charge ($-1/3$) quark, which leads to a deviation from
CKM unitarity.
| [
{
"created": "Thu, 30 Jun 1994 16:53:05 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Bhattacharyya",
"Gautam",
""
],
[
"Branco",
"Gustavo C.",
""
],
[
"Choudhury",
"Debajyoti",
""
]
] | We point out that $R \equiv Br(b\rightarrow d \gamma)/Br(b\rightarrow s \gamma)$ is a sensitive probe of possible violation of CKM unitarity. We compute $R$ in a minimal extension of the Standard Model containing an additional isosinglet charge ($-1/3$) quark, which leads to a deviation from CKM unitarity. |
1412.8378 | Josef Pradler | Haipeng An, Maxim Pospelov, Josef Pradler, Adam Ritz | Direct Detection Constraints on Dark Photon Dark Matter | 10 pages, 4 figures; numerical bug in J-factor corrected; main
results unchanged | Phys.Lett. B747 (2015) 331-338 | 10.1016/j.physletb.2015.06.018 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark matter detectors built primarily to probe elastic scattering of WIMPs on
nuclei are also precise probes of light, weakly coupled particles that may be
absorbed by the detector material. In this paper, we derive constraints on the
minimal model of dark matter comprised of long-lived vector states V (dark
photons) in the 0.01-100 keV mass range. The absence of an ionization signal in
direct detection experiments such as XENON10 and XENON100 places a very strong
constraint on the dark photon mixing angle, down to $O(10^{-15})$, assuming
that dark photons comprise the dominant fraction of dark matter. This
sensitivity to dark photon dark matter exceeds the indirect bounds derived from
stellar energy loss considerations over a significant fraction of the available
mass range. We also revisit indirect constraints from $V\to 3\gamma$ decay and
show that limits from modifications to the cosmological ionization history are
comparable to the updated limits from the diffuse gamma-ray flux.
| [
{
"created": "Mon, 29 Dec 2014 15:58:33 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jun 2015 17:11:38 GMT",
"version": "v2"
},
{
"created": "Wed, 22 Jul 2015 09:22:00 GMT",
"version": "v3"
}
] | 2015-07-23 | [
[
"An",
"Haipeng",
""
],
[
"Pospelov",
"Maxim",
""
],
[
"Pradler",
"Josef",
""
],
[
"Ritz",
"Adam",
""
]
] | Dark matter detectors built primarily to probe elastic scattering of WIMPs on nuclei are also precise probes of light, weakly coupled particles that may be absorbed by the detector material. In this paper, we derive constraints on the minimal model of dark matter comprised of long-lived vector states V (dark photons) in the 0.01-100 keV mass range. The absence of an ionization signal in direct detection experiments such as XENON10 and XENON100 places a very strong constraint on the dark photon mixing angle, down to $O(10^{-15})$, assuming that dark photons comprise the dominant fraction of dark matter. This sensitivity to dark photon dark matter exceeds the indirect bounds derived from stellar energy loss considerations over a significant fraction of the available mass range. We also revisit indirect constraints from $V\to 3\gamma$ decay and show that limits from modifications to the cosmological ionization history are comparable to the updated limits from the diffuse gamma-ray flux. |
hep-ph/9607290 | Martin McDermott | W. Buchmuller, A. Hebecker and M.F. McDermott | Gluon Radiation in Diffractive Electroproduction | 32 pages, 5 figures. Four equations are changed to account for a
technical error. The qualitative discussion of the paper is not affected | Nucl.Phys.B487:283-310,1997; Erratum-ibid.B500:621-622,1997 | 10.1016/S0550-3213(96)00623-2 | DESY 96-126, SLAC-PUB-7204 | hep-ph | null | Order $\alpha_s$-corrections to the diffractive structure functions $F_L^D$
and $F_2^D$ at large $Q^2$ and small $x$ are evaluated in the semiclassical
approach, where the initial proton is treated as a classical colour field. The
diffractive final state contains a fast gluon in addition to a quark-antiquark
pair. Two of these partons may have large transverse momentum. Our calculations
lead to an intuitive picture of deep-inelastic diffractive processes which is
very similar to Bjorken's aligned-jet model. Both diffractive structure
functions contain leading twist contributions from high-$p_{\perp}$ jets.
| [
{
"created": "Thu, 11 Jul 1996 14:01:04 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Aug 1997 12:55:23 GMT",
"version": "v2"
}
] | 2009-02-20 | [
[
"Buchmuller",
"W.",
""
],
[
"Hebecker",
"A.",
""
],
[
"McDermott",
"M. F.",
""
]
] | Order $\alpha_s$-corrections to the diffractive structure functions $F_L^D$ and $F_2^D$ at large $Q^2$ and small $x$ are evaluated in the semiclassical approach, where the initial proton is treated as a classical colour field. The diffractive final state contains a fast gluon in addition to a quark-antiquark pair. Two of these partons may have large transverse momentum. Our calculations lead to an intuitive picture of deep-inelastic diffractive processes which is very similar to Bjorken's aligned-jet model. Both diffractive structure functions contain leading twist contributions from high-$p_{\perp}$ jets. |
1408.4575 | Seong Chan Park | Carsten Rott, Kazunori Kohri, Seong Chan Park | Superheavy dark matter and IceCube neutrino signals:bounds on decaying
dark matter | 5 pages, 2 figures | Phys. Rev. D 92, 023529 (2015) | 10.1103/PhysRevD.92.023529 | KEK-Cosmo-153, KEK-TH 1761, KIAS-P14052 | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Superheavy dark matter may show its presence in high energy neutrino signals
detected on earth. From the latest results of IceCube, we could set the
strongest lower bound on the lifetime of dark matter beyond 100 TeV around
$10^{28} {\rm sec}$. The excess around a PeV is noticed and may be interpreted
as the first signal of DM even though further confirmation and dedicated
searches are invited.
| [
{
"created": "Wed, 20 Aug 2014 09:24:08 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Jul 2015 00:33:05 GMT",
"version": "v2"
}
] | 2015-07-28 | [
[
"Rott",
"Carsten",
""
],
[
"Kohri",
"Kazunori",
""
],
[
"Park",
"Seong Chan",
""
]
] | Superheavy dark matter may show its presence in high energy neutrino signals detected on earth. From the latest results of IceCube, we could set the strongest lower bound on the lifetime of dark matter beyond 100 TeV around $10^{28} {\rm sec}$. The excess around a PeV is noticed and may be interpreted as the first signal of DM even though further confirmation and dedicated searches are invited. |
0806.4886 | Jerome de Favereau de Jeneret | J. de Favereau de Jeneret, S. Ovyn | Single top quark photoproduction at the LHC | null | Nucl.Phys.Proc.Suppl.179-180:277-284,2008 | 10.1016/j.nuclphysbps.2008.07.040 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | High-energy photon-proton interactions at the LHC offer interesting
possibilities for the study of the electroweak sector up to TeV scale and
searches for processes beyond the Standard Model. An analysis of the W
associated single top photoproduction has been performed using the adapted
MadGraph/MadEvent and CalcHEP programs interfaced to the Pythia generator and a
fast detector simulation program. Event selection and suppression of main
backgrounds have been studied. A comparable sensitivity to |V_{tb}| to those
obtained using the standard single top production in pp collisions has been
achieved already for 10 fb^{-1} of integrated luminosity. Photoproduction at
the LHC provides also an attractive framework for observation of the anomalous
production of single top due to Flavour-Changing Neutral Currents. The
sensitivity to anomalous coupling parameters, k_{tu\gamma} and k_{tc\gamma} is
presented and indicates that stronger limits can be placed on anomalous
couplings after 1 fb^{-1}.
| [
{
"created": "Mon, 30 Jun 2008 13:18:03 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"de Jeneret",
"J. de Favereau",
""
],
[
"Ovyn",
"S.",
""
]
] | High-energy photon-proton interactions at the LHC offer interesting possibilities for the study of the electroweak sector up to TeV scale and searches for processes beyond the Standard Model. An analysis of the W associated single top photoproduction has been performed using the adapted MadGraph/MadEvent and CalcHEP programs interfaced to the Pythia generator and a fast detector simulation program. Event selection and suppression of main backgrounds have been studied. A comparable sensitivity to |V_{tb}| to those obtained using the standard single top production in pp collisions has been achieved already for 10 fb^{-1} of integrated luminosity. Photoproduction at the LHC provides also an attractive framework for observation of the anomalous production of single top due to Flavour-Changing Neutral Currents. The sensitivity to anomalous coupling parameters, k_{tu\gamma} and k_{tc\gamma} is presented and indicates that stronger limits can be placed on anomalous couplings after 1 fb^{-1}. |
1008.5277 | Wei Chao | Wei Chao and Yong-chao Zhang | The D0 Dimuon Charge Asymmetry and Baryon Asymmetry of the Universe | 10 pages, 2 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The D0 collaboration has reported a 3.2 \sigma deviation from the Standard
Model (SM) prediction in the like-sign dimuon charge asymmetry. New physics
beyond the SM in B_s - \bar B_s mixing is needed to explain the data. In this
paper, we investigate the possible extension of the SM with one generation
color-triplet charged scalar as well as three generation Majorana fermions. We
study the implications of the model on the D0's dimuon charge asymmetry as well
as matter anti-matter asymmetry of the Universe.
| [
{
"created": "Tue, 31 Aug 2010 10:34:58 GMT",
"version": "v1"
}
] | 2010-09-01 | [
[
"Chao",
"Wei",
""
],
[
"Zhang",
"Yong-chao",
""
]
] | The D0 collaboration has reported a 3.2 \sigma deviation from the Standard Model (SM) prediction in the like-sign dimuon charge asymmetry. New physics beyond the SM in B_s - \bar B_s mixing is needed to explain the data. In this paper, we investigate the possible extension of the SM with one generation color-triplet charged scalar as well as three generation Majorana fermions. We study the implications of the model on the D0's dimuon charge asymmetry as well as matter anti-matter asymmetry of the Universe. |
1505.03149 | Angelo Monteux | Angelo Monteux, Chang Sub Shin (NHETC, Rutgers University) | Thermal Goldstino Production with Low Reheating Temperatures | 25 pages, 6 figures | Phys. Rev. D 92, 035002 (2015) | 10.1103/PhysRevD.92.035002 | RUNHETC-2015-03 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss thermal production of (pseudo) goldstinos, the Goldstone fermions
emerging from (multiple) SUSY breaking sectors, when the reheating temperature
is well below the superpartner masses. In such a case, the production during
matter-dominated era induced by inflaton decay stage is more important than
after reheating. Depending on the SUSY breaking scale, goldstinos are produced
by freeze-in or freeze-out mechanism via $1\to 2$ decays and inverse decays. We
solve the Boltzmann equation for the momentum distribution function of the
goldstino.In the freeze-out case, goldstinos maintain chemical equilibrium far
after they are kinetically decoupled from the thermal bath, and consequently
goldstinos with different momentum decouple at different temperatures. As a
result their momentum distribution function shows a peculiar shape and the
final yield is smaller than if kinetic equilibrium was assumed. We revisit the
cosmological implications in both R-parity-conserving and R-parity-violating
supersymmetric scenarios. For the former, thermally produced goldstinos can
still be abundant enough to be dark matter at present times even if the
reheating temperature is low, of order $1$ GeV. For the latter, if the
reheating temperature is low, of order $0.1-1$ GeV, they are safe from the BBN
constraints.
| [
{
"created": "Tue, 12 May 2015 20:00:28 GMT",
"version": "v1"
}
] | 2015-08-12 | [
[
"Monteux",
"Angelo",
"",
"NHETC, Rutgers University"
],
[
"Shin",
"Chang Sub",
"",
"NHETC, Rutgers University"
]
] | We discuss thermal production of (pseudo) goldstinos, the Goldstone fermions emerging from (multiple) SUSY breaking sectors, when the reheating temperature is well below the superpartner masses. In such a case, the production during matter-dominated era induced by inflaton decay stage is more important than after reheating. Depending on the SUSY breaking scale, goldstinos are produced by freeze-in or freeze-out mechanism via $1\to 2$ decays and inverse decays. We solve the Boltzmann equation for the momentum distribution function of the goldstino.In the freeze-out case, goldstinos maintain chemical equilibrium far after they are kinetically decoupled from the thermal bath, and consequently goldstinos with different momentum decouple at different temperatures. As a result their momentum distribution function shows a peculiar shape and the final yield is smaller than if kinetic equilibrium was assumed. We revisit the cosmological implications in both R-parity-conserving and R-parity-violating supersymmetric scenarios. For the former, thermally produced goldstinos can still be abundant enough to be dark matter at present times even if the reheating temperature is low, of order $1$ GeV. For the latter, if the reheating temperature is low, of order $0.1-1$ GeV, they are safe from the BBN constraints. |
hep-ph/9912445 | Richard D. Ball | R.D. Ball and P.V. Landshoff | The Challenge of Small x | 12 pages, 7 figures: contribution to Durham Phenomenology Workshop
proceedings | J.Phys.G26:672-682,2000 | 10.1088/0954-3899/26/5/326 | Edinburgh 99/21, DAMTP-1999-170 | hep-ph | null | We review the current understanding of the behaviour of inclusive cross
sections at small x and large Q^2 in terms of Altarelli-Parisi evolution, the
BFKL equation, and Regge theory, asking in particular to what extent they are
mutually consistent.
| [
{
"created": "Tue, 21 Dec 1999 15:04:41 GMT",
"version": "v1"
}
] | 2010-03-25 | [
[
"Ball",
"R. D.",
""
],
[
"Landshoff",
"P. V.",
""
]
] | We review the current understanding of the behaviour of inclusive cross sections at small x and large Q^2 in terms of Altarelli-Parisi evolution, the BFKL equation, and Regge theory, asking in particular to what extent they are mutually consistent. |
hep-ph/0005255 | Ji Young Yu | E. A. Paschos (I. A. S., Princeton), L. Pasquali and J. Y. Yu
(Dortmund U.) | Single Pion Production in Neutrino Reactions and Estimates for
Charge-Exchange Effects | 20 pages, 16 figures | Nucl.Phys. B588 (2000) 263-280 | 10.1016/S0550-3213(00)00486-7 | DO-TH 00/10 | hep-ph | null | We calculate single pion production by neutrinos in the resonance region. We
consider both charged and neutral current reactions on free protons and
neutrons. We present differential and total cross sections which can be
compared with experiments. Then we use these results to calculate the spectra
of the emerging pions including the Pauli suppression factor and rescattering
corrections for reactions in heavy nuclei. Our results will be useful for
studying single pion production and for investigating neutrino oscillations in
future experiments.
| [
{
"created": "Thu, 25 May 2000 13:03:18 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Paschos",
"E. A.",
"",
"I. A. S., Princeton"
],
[
"Pasquali",
"L.",
"",
"Dortmund U."
],
[
"Yu",
"J. Y.",
"",
"Dortmund U."
]
] | We calculate single pion production by neutrinos in the resonance region. We consider both charged and neutral current reactions on free protons and neutrons. We present differential and total cross sections which can be compared with experiments. Then we use these results to calculate the spectra of the emerging pions including the Pauli suppression factor and rescattering corrections for reactions in heavy nuclei. Our results will be useful for studying single pion production and for investigating neutrino oscillations in future experiments. |
2004.08407 | Alexandre Alves | Alexandre Alves, Alex Gomes Dias, and Roberto da Silva | The 7% Rule: A Maximum Entropy Prediction on New Decays of the Higgs
Boson | 12 pages, 5 figures. Version published in Nuclear Physics B | null | 10.1016/j.nuclphysb.2020.115137 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The entropy of the Higgs boson decay probabilities distribution in the
Standard Model (SM) is maximized for a Higgs mass value that is less than one
standard deviation away from the current experimental measurement. This
successful estimate of the Higgs mass encourages us to propose tests of the
Maximum Entropy Principle (MEP) as a tool for theoretical inferences in other
instances of Higgs physics. In this letter, we show that, irrespective of the
extension of the SM predicting a new Higgs boson decay channel, its branching
ratio can be inferred to be around 7% in such a way that the new entropy of
decays still exhibits a maximum at the experimental Higgs mass. This 7% rule
can be tested whenever a new Higgs decay channel is found. In order to
illustrate the MEP predictions, we apply the MEP inference to Higgs portal
models, Higgs-axion interactions, lepton flavour violating decays of the Higgs
boson, and a dark gauge boson model.
| [
{
"created": "Fri, 17 Apr 2020 18:01:04 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Aug 2020 20:28:45 GMT",
"version": "v2"
}
] | 2020-08-14 | [
[
"Alves",
"Alexandre",
""
],
[
"Dias",
"Alex Gomes",
""
],
[
"da Silva",
"Roberto",
""
]
] | The entropy of the Higgs boson decay probabilities distribution in the Standard Model (SM) is maximized for a Higgs mass value that is less than one standard deviation away from the current experimental measurement. This successful estimate of the Higgs mass encourages us to propose tests of the Maximum Entropy Principle (MEP) as a tool for theoretical inferences in other instances of Higgs physics. In this letter, we show that, irrespective of the extension of the SM predicting a new Higgs boson decay channel, its branching ratio can be inferred to be around 7% in such a way that the new entropy of decays still exhibits a maximum at the experimental Higgs mass. This 7% rule can be tested whenever a new Higgs decay channel is found. In order to illustrate the MEP predictions, we apply the MEP inference to Higgs portal models, Higgs-axion interactions, lepton flavour violating decays of the Higgs boson, and a dark gauge boson model. |
hep-ph/9710206 | Dalibor Kekez | Dubravko Klabucar and Dalibor Kekez | eta and eta' in a coupled Schwinger-Dyson and Bethe-Salpeter approach | 30 pages, RevTeX, 2 eps figures, title changed, material reorganized,
refereces updated; to appear in Phys. Rev. D | Phys. Rev. D 58, 096003 (1998) | 10.1103/PhysRevD.58.096003 | ZTF-97/R01 | hep-ph nucl-th | null | Extending our earlier treatments of pi0, eta_c and eta_b, we study the
eta-eta' system and its gamma-gamma decays using a model which is a leading
version of the consistently coupled Schwinger-Dyson (SD) and Bethe-Salpeter
(BS) approach. The electromagnetic interactions are incorporated through a
(generalized) impulse approximation consistent with this bound-state approach,
so that the Ward-Takahashi identities of QED are preserved when quarks are
dynamically dressed. To overcome some of the limitations due to the ladder
approximation, we introduce a minimal extension to the bound--state approach
employed, so that the U_A(1) problem is avoided. Pointing out which of our
predictions hold in the coupled SD-BS approach in general, and which are the
consequences of the specific, chosen model, we present the results for the
axial-current decay constants of eta_8, eta_0, and of their physical
combinations eta and eta', the results for the gamma-gamma decay constants of
eta_0 and eta_8, for the two-photon decay widths of eta and eta', and for the
mixing-independent R-ratio constructed from them.
| [
{
"created": "Wed, 1 Oct 1997 16:17:23 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jun 1998 10:36:03 GMT",
"version": "v2"
}
] | 2016-08-25 | [
[
"Klabucar",
"Dubravko",
""
],
[
"Kekez",
"Dalibor",
""
]
] | Extending our earlier treatments of pi0, eta_c and eta_b, we study the eta-eta' system and its gamma-gamma decays using a model which is a leading version of the consistently coupled Schwinger-Dyson (SD) and Bethe-Salpeter (BS) approach. The electromagnetic interactions are incorporated through a (generalized) impulse approximation consistent with this bound-state approach, so that the Ward-Takahashi identities of QED are preserved when quarks are dynamically dressed. To overcome some of the limitations due to the ladder approximation, we introduce a minimal extension to the bound--state approach employed, so that the U_A(1) problem is avoided. Pointing out which of our predictions hold in the coupled SD-BS approach in general, and which are the consequences of the specific, chosen model, we present the results for the axial-current decay constants of eta_8, eta_0, and of their physical combinations eta and eta', the results for the gamma-gamma decay constants of eta_0 and eta_8, for the two-photon decay widths of eta and eta', and for the mixing-independent R-ratio constructed from them. |
0801.0047 | Vladimir Burdyuzha | V.Burdyuzha | When did vacuum energy of the Universe become cosmological constant? | 3 pages. submitted to Phys. Letters | null | null | null | hep-ph | null | A quark-gluon phase transition in the Universe is researched after which
vacuum (dark) energy has hardened and become cosmological constant. Before this
a vacuum component of the Universe was changing by jumps during phase
transitions since vacuum condensates of quantum fields carried a negative
contribution in its positive density energy. This quintessence period of the
Universe life took place during the first parts of a second when our Universe
was losing high symmetry. Using Zel'dovich's formula the modern value of vacuum
energy is also calculated. It is shown that a quantum chromodynamical vacuum
which is characterized by pseudogoldstone bosons existed definitely when
temperature of the Universe was T~150 MeV. Therefore there is a large
probability that dark energy is vacuum energy.
| [
{
"created": "Sat, 29 Dec 2007 10:58:14 GMT",
"version": "v1"
}
] | 2008-01-03 | [
[
"Burdyuzha",
"V.",
""
]
] | A quark-gluon phase transition in the Universe is researched after which vacuum (dark) energy has hardened and become cosmological constant. Before this a vacuum component of the Universe was changing by jumps during phase transitions since vacuum condensates of quantum fields carried a negative contribution in its positive density energy. This quintessence period of the Universe life took place during the first parts of a second when our Universe was losing high symmetry. Using Zel'dovich's formula the modern value of vacuum energy is also calculated. It is shown that a quantum chromodynamical vacuum which is characterized by pseudogoldstone bosons existed definitely when temperature of the Universe was T~150 MeV. Therefore there is a large probability that dark energy is vacuum energy. |
0901.4101 | Giulia Zanderighi | R. Keith Ellis, Kirill Melnikov, Giulia Zanderighi | Generalized unitarity at work: first NLO QCD results for hadronic W+3jet
production | 20 pages, 4 figures | JHEP 0904:077,2009 | 10.1088/1126-6708/2009/04/077 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the leading color, next-to-leading order QCD corrections to the
dominant partonic channels for the production of a W boson in association with
three jets at the Tevatron and the LHC. This is the first application of
generalized unitarity for realistic one-loop calculations. The method performs
well in this non-trivial test and offers great promise for the future.
| [
{
"created": "Tue, 27 Jan 2009 20:24:30 GMT",
"version": "v1"
}
] | 2010-01-07 | [
[
"Ellis",
"R. Keith",
""
],
[
"Melnikov",
"Kirill",
""
],
[
"Zanderighi",
"Giulia",
""
]
] | We compute the leading color, next-to-leading order QCD corrections to the dominant partonic channels for the production of a W boson in association with three jets at the Tevatron and the LHC. This is the first application of generalized unitarity for realistic one-loop calculations. The method performs well in this non-trivial test and offers great promise for the future. |
hep-ph/9503429 | Ilya Royzen | I. Royzen | Theoretical Approach to Alignment Phenomenon | 7 pages, LaTEX, 4 figures (available from the author upon request) | Mod.Phys.Lett. A9 (1994) 3517-3522 | 10.1142/S021773239400335X | Mod. Phys. Lett. A, vol. 9, no 38, (1994), p. 3517 | hep-ph | null | An explanation of the puzzling alignment effect observed in cosmic ray
experiments is suggested
| [
{
"created": "Thu, 23 Mar 1995 12:49:54 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Royzen",
"I.",
""
]
] | An explanation of the puzzling alignment effect observed in cosmic ray experiments is suggested |
1405.1185 | Luca Rottoli | Luca Rottoli | Threshold resummation in SCET vs. direct QCD: a systematic comparison | 110 pages, Master's thesis. Supervisors: S. Forte, G. Ridolfi | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a systematic comparison of soft-gluon resummation in SCET and in a
standard "direct" QCD (dQCD) approach, both from an analytical and a
phenomenological point of view. In particular, we concentrate on Higgs boson
production in gluon-gluon fusion at a hadron collider. Using specifically a
saddle point argument, we arrive at a detailed understanding of the
quantitative differences between these two approaches.
| [
{
"created": "Tue, 6 May 2014 08:14:08 GMT",
"version": "v1"
}
] | 2014-05-07 | [
[
"Rottoli",
"Luca",
""
]
] | We perform a systematic comparison of soft-gluon resummation in SCET and in a standard "direct" QCD (dQCD) approach, both from an analytical and a phenomenological point of view. In particular, we concentrate on Higgs boson production in gluon-gluon fusion at a hadron collider. Using specifically a saddle point argument, we arrive at a detailed understanding of the quantitative differences between these two approaches. |
hep-ph/0307305 | Peter Richardson | C.M. Harris (Cambridge), P. Richardson (CERN), and B.R. Webber
(Cambridge and CERN) | CHARYBDIS: A Black Hole Event Generator | 14 pages, 3 postscript figures. Program available from
http://www.ippp.dur.ac.uk/montecarlo/leshouches/generators/charybdis/ .
Footnote and two references added | JHEP0308:033,2003 | 10.1088/1126-6708/2003/08/033 | Cavendish-HEP-03/12 CERN-TH/2003-170 | hep-ph | null | CHARYBDIS is an event generator which simulates the production and decay of
miniature black holes at hadronic colliders as might be possible in certain
extra dimension models. It interfaces via the Les Houches accord to general
purpose Monte Carlo programs like HERWIG and PYTHIA which then perform the
parton evolution and hadronization. The event generator includes the
extra-dimensional `grey-body' effects as well as the change in the temperature
of the black hole as the decay progresses. Various options for modelling the
Planck-scale terminal decay are provided.
| [
{
"created": "Thu, 24 Jul 2003 14:52:22 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Jul 2003 14:43:19 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Harris",
"C. M.",
"",
"Cambridge"
],
[
"Richardson",
"P.",
"",
"CERN"
],
[
"Webber",
"B. R.",
"",
"Cambridge and CERN"
]
] | CHARYBDIS is an event generator which simulates the production and decay of miniature black holes at hadronic colliders as might be possible in certain extra dimension models. It interfaces via the Les Houches accord to general purpose Monte Carlo programs like HERWIG and PYTHIA which then perform the parton evolution and hadronization. The event generator includes the extra-dimensional `grey-body' effects as well as the change in the temperature of the black hole as the decay progresses. Various options for modelling the Planck-scale terminal decay are provided. |
1302.6726 | Alexei P. Martynenko | A.P. Martynenko (Samara State U. & Samara State Aerospace U.) and A.M.
Trunin (Samara State Aerospace U.) | Relativistic corrections to \eta_c-pair production in high energy
proton-proton collisions | 12 pages, 3 figures | null | 10.1016/j.physletb.2013.05.003 | SSU-HEP-13/02 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | On the basis of perturbative QCD and the relativistic quark model we
calculate relativistic corrections to the double $\eta_c$ meson production in
proton-proton interactions at LHC energies. Relativistic terms in the
production amplitude connected with the relative motion of heavy quarks and the
transformation law of the bound state wave functions to the reference frame of
moving charmonia are taken into account. For the gluon and quark propagators
entering the amplitude we use a truncated expansion in relative quark momenta
up to the second order. Relativistic corrections to the quark bound state wave
functions are considered by means of the Breit-like potential. It turns out
that the examined effects decrease total nonrelativistic cross section more
than two times and on 20 percents in the rapidity region of LHCb detector.
| [
{
"created": "Wed, 27 Feb 2013 11:25:40 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Martynenko",
"A. P.",
"",
"Samara State U. & Samara State Aerospace U."
],
[
"Trunin",
"A. M.",
"",
"Samara State Aerospace U."
]
] | On the basis of perturbative QCD and the relativistic quark model we calculate relativistic corrections to the double $\eta_c$ meson production in proton-proton interactions at LHC energies. Relativistic terms in the production amplitude connected with the relative motion of heavy quarks and the transformation law of the bound state wave functions to the reference frame of moving charmonia are taken into account. For the gluon and quark propagators entering the amplitude we use a truncated expansion in relative quark momenta up to the second order. Relativistic corrections to the quark bound state wave functions are considered by means of the Breit-like potential. It turns out that the examined effects decrease total nonrelativistic cross section more than two times and on 20 percents in the rapidity region of LHCb detector. |
1506.00254 | Bumseok Kyae | Bumseok Kyae | Shifted focus point scenario from the minimal mixed mediation of SUSY
breaking | 4 pages, 1 figure, prepared for the proceedings of the 2nd Toyama
International Workshop on Higgs as a Probe of New Physics (HPNP 2015),
February 11-15, 2015 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We employ both the minimal gravity- and the minimal gauge mediations of
supersymmetry breaking at the grand unified theory (GUT) scale in a single
supergravity framework, assuming the gaugino masses are generated dominantly by
the minimal gauge mediation effects. In such a "minimal mixed mediation model,"
a "focus point" of the soft Higgs mass parameter, m_{h_u}^2 emerges at 3-4 TeV
energy scale, which is exactly the stop mass scale needed for explaining the
126 GeV Higgs boson mass without the "A-term" at the three loop level. As a
result, m_{h_u}^2 in the MSSM can be quite insensitive to various trial stop
masses at low energy, reducing the fine-tuning measures to be much smaller than
100 even for a 3-4 TeV low energy stop mass and -0.5 < A_t / m_0 < +0.1 at the
GUT scale. The $\mu$ parameter is smaller than 600 GeV. The gluino mass is
predicted to be about 1.7 TeV, which could readily be tested at LHC run2.
| [
{
"created": "Sun, 31 May 2015 16:50:23 GMT",
"version": "v1"
}
] | 2015-06-02 | [
[
"Kyae",
"Bumseok",
""
]
] | We employ both the minimal gravity- and the minimal gauge mediations of supersymmetry breaking at the grand unified theory (GUT) scale in a single supergravity framework, assuming the gaugino masses are generated dominantly by the minimal gauge mediation effects. In such a "minimal mixed mediation model," a "focus point" of the soft Higgs mass parameter, m_{h_u}^2 emerges at 3-4 TeV energy scale, which is exactly the stop mass scale needed for explaining the 126 GeV Higgs boson mass without the "A-term" at the three loop level. As a result, m_{h_u}^2 in the MSSM can be quite insensitive to various trial stop masses at low energy, reducing the fine-tuning measures to be much smaller than 100 even for a 3-4 TeV low energy stop mass and -0.5 < A_t / m_0 < +0.1 at the GUT scale. The $\mu$ parameter is smaller than 600 GeV. The gluino mass is predicted to be about 1.7 TeV, which could readily be tested at LHC run2. |
2210.12133 | Darius Jurciukonis | Darius Jur\v{c}iukonis and Lu\'is Lavoura | The centers of discrete groups as stabilizers of Dark Matter | 15 pages, no figures; v2: added references; v3: matches published
version | Prog. Theor. Exp. Phys. 2023, 2, 023B02 | 10.1093/ptep/ptad004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The most usual option to stabilize Dark Matter (DM) is a $Z_2$ symmetry. In
general, though, DM may be stabilized by any $Z_N$ with $N \ge 2$. We consider
the way $Z_N$ is a subgroup of the internal-symmetry group $G$ of a model; we
entertain the possibility that $Z_N$ is the center of $G$, yet $G$ is not of
the form $Z_N \times G^\prime$, where $G^\prime$ is a group smaller (i.e. of
lower order) than $G$. We examine all the discrete groups of order smaller than
2001 and we find that many of them cannot be written as the direct product of a
cyclic group and some other group, yet they have a non-trivial center that
might be used in Model Building to stabilize DM.
| [
{
"created": "Fri, 21 Oct 2022 17:43:44 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Oct 2022 14:45:21 GMT",
"version": "v2"
},
{
"created": "Sat, 11 Feb 2023 17:03:35 GMT",
"version": "v3"
}
] | 2023-02-14 | [
[
"Jurčiukonis",
"Darius",
""
],
[
"Lavoura",
"Luís",
""
]
] | The most usual option to stabilize Dark Matter (DM) is a $Z_2$ symmetry. In general, though, DM may be stabilized by any $Z_N$ with $N \ge 2$. We consider the way $Z_N$ is a subgroup of the internal-symmetry group $G$ of a model; we entertain the possibility that $Z_N$ is the center of $G$, yet $G$ is not of the form $Z_N \times G^\prime$, where $G^\prime$ is a group smaller (i.e. of lower order) than $G$. We examine all the discrete groups of order smaller than 2001 and we find that many of them cannot be written as the direct product of a cyclic group and some other group, yet they have a non-trivial center that might be used in Model Building to stabilize DM. |
hep-ph/0112338 | Naotoshi Okamura | M. Aoki (1), K. Hagiwara (1), Y. Hayato (1), T. Kobayashi (1), T.
Nakaya (2), K. Nishikawa (2), and N. Okamura (3) ((1) KEK, (2) Kyoto Univ.
(3) Virginia Tech) | Prospects of Very Long Base-Line Neutrino Oscillation Experiments with
the KEK-JAERI High Intensity Proton Accelerator | 65 pages, 22 figures, and 9 tables | Phys.Rev.D67:093004,2003 | 10.1103/PhysRevD.67.093004 | KEK-TH-798, VPI-IPPAP-01-03 | hep-ph hep-ex | null | We study physics potential of Very Long Base-Line (VLBL) Neutrino-Oscillation
Experiments with the High Intensity Proton Accelerator (HIPA), which will be
completed by the year 2007 in Tokai-village, Japan, as a joint project of KEK
and JAERI (Japan Atomic Energy Research Institute). The HIPA 50 GeV proton beam
will deliver neutrino beams of a few GeV range with the intensity about two
orders of magnitude higher than the present KEK beam for K2K experiment. As a
sequel to the proposed HIPA-to-Super-Kamiokande experiment, we study impacts of
experiments with a 100 kton-level detector and the base-line length of a
few-thousand km. The pulsed narrow-band nu_mu beams (NBB) allow us to measure
the nu_mu to nu_e transition probability and the nu_mu survival probability
through counting experiments at large water-Cerenkov detector. We study
sensitivity of such experiments to the neutrino mass hierarchy, the
mass-squared differences, the three angles, and one CP phase of the
three-generation lepton-flavor-mixing matrix. We find that experiments at a
distance between 1,000 and 2,000 km can determine the sign of the larger
mass-squared difference (m_3^2-m_1^2) if the mixing between nu_e and nu_3 (the
heaviest-or-lightest neutrino) is not too small; 2|U_{e3}|^2(1-|U_{e3}|^2) gsim
0.03. The CP phase can be constrained if the |U_{e3}| element is sufficiently
large, 2|U_{e3}|^2(1-|U_{e3}|^2) gsim 0.06, and if the smaller mass-squared
difference (m_2^2-m_1^2) and the U_{e2} element are in the prefered range of
the large-mixing-angle solution of the solar-neutrino deficit. The magunitude |
m_3^2-m_1^2| and the matrix element U_{mu 3} can be precisely measured, but we
find little sensitivity to m_2^2-m_1^2 and the matrix element U_{e2}.
| [
{
"created": "Thu, 27 Dec 2001 16:23:38 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Aoki",
"M.",
""
],
[
"Hagiwara",
"K.",
""
],
[
"Hayato",
"Y.",
""
],
[
"Kobayashi",
"T.",
""
],
[
"Nakaya",
"T.",
""
],
[
"Nishikawa",
"K.",
""
],
[
"Okamura",
"N.",
""
]
] | We study physics potential of Very Long Base-Line (VLBL) Neutrino-Oscillation Experiments with the High Intensity Proton Accelerator (HIPA), which will be completed by the year 2007 in Tokai-village, Japan, as a joint project of KEK and JAERI (Japan Atomic Energy Research Institute). The HIPA 50 GeV proton beam will deliver neutrino beams of a few GeV range with the intensity about two orders of magnitude higher than the present KEK beam for K2K experiment. As a sequel to the proposed HIPA-to-Super-Kamiokande experiment, we study impacts of experiments with a 100 kton-level detector and the base-line length of a few-thousand km. The pulsed narrow-band nu_mu beams (NBB) allow us to measure the nu_mu to nu_e transition probability and the nu_mu survival probability through counting experiments at large water-Cerenkov detector. We study sensitivity of such experiments to the neutrino mass hierarchy, the mass-squared differences, the three angles, and one CP phase of the three-generation lepton-flavor-mixing matrix. We find that experiments at a distance between 1,000 and 2,000 km can determine the sign of the larger mass-squared difference (m_3^2-m_1^2) if the mixing between nu_e and nu_3 (the heaviest-or-lightest neutrino) is not too small; 2|U_{e3}|^2(1-|U_{e3}|^2) gsim 0.03. The CP phase can be constrained if the |U_{e3}| element is sufficiently large, 2|U_{e3}|^2(1-|U_{e3}|^2) gsim 0.06, and if the smaller mass-squared difference (m_2^2-m_1^2) and the U_{e2} element are in the prefered range of the large-mixing-angle solution of the solar-neutrino deficit. The magunitude | m_3^2-m_1^2| and the matrix element U_{mu 3} can be precisely measured, but we find little sensitivity to m_2^2-m_1^2 and the matrix element U_{e2}. |
hep-ph/0601026 | Tetsuo Hyodo | T. Hyodo (1), Sourav Sarkar (2), A. Hosaka (1), E. Oset (2) ((1) RCNP,
Osaka Univ., (2) IFIC, Valencia Univ.) | Coupling of \bar K*N to the Lambda(1520) | RevTeX4, 8 pages, 6 figures, Version to appear in Phys. Rev. C | Phys.Rev.C73:035209,2006; Erratum-ibid.C75:029901,2007 | 10.1103/PhysRevC.73.035209 10.1103/PhysRevC.75.029901 | null | hep-ph | null | We study the coupling of the Lambda(1520)= Lambda* resonance to the \bar K*
vector meson and nucleon. This coupling is not directly measured from the
resonance decay, but is expected to be important in hyperon production
reactions, in particular for the exotic Theta+ production. We compute the
coupling in two different schemes, one in the chiral unitary model where the
Lambda* is dominated by the quasibound state of mesons and baryons, and the
other in the quark model where the resonance is a p-wave excitation in the
three valence quarks. Although it is possible to construct both models such
that they reproduce the \bar K N and pi Sigma decays, there is a significant
difference between the Lambda* \bar K* N couplings in the two models. In the
chiral unitary model $|g_{\Lambda^*\bar{K}^* N}| \sim 1.5$, while in the quark
model $|g_{\Lambda^*\bar{K}^* N}| \sim 10$. The difference of the results stems
from the different structure of the Lambda* in both models, and hence, an
experimental determination of this coupling would shed light on the nature of
the resonance.
| [
{
"created": "Wed, 4 Jan 2006 08:18:02 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Mar 2006 01:54:54 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Hyodo",
"T.",
""
],
[
"Sarkar",
"Sourav",
""
],
[
"Hosaka",
"A.",
""
],
[
"Oset",
"E.",
""
]
] | We study the coupling of the Lambda(1520)= Lambda* resonance to the \bar K* vector meson and nucleon. This coupling is not directly measured from the resonance decay, but is expected to be important in hyperon production reactions, in particular for the exotic Theta+ production. We compute the coupling in two different schemes, one in the chiral unitary model where the Lambda* is dominated by the quasibound state of mesons and baryons, and the other in the quark model where the resonance is a p-wave excitation in the three valence quarks. Although it is possible to construct both models such that they reproduce the \bar K N and pi Sigma decays, there is a significant difference between the Lambda* \bar K* N couplings in the two models. In the chiral unitary model $|g_{\Lambda^*\bar{K}^* N}| \sim 1.5$, while in the quark model $|g_{\Lambda^*\bar{K}^* N}| \sim 10$. The difference of the results stems from the different structure of the Lambda* in both models, and hence, an experimental determination of this coupling would shed light on the nature of the resonance. |
1611.05091 | Cen Zhang | Cen Zhang | NLO predictions for SMEFT in the top-quark sector | Proceedings for the 38th International Conference on High Energy
Physics (Chicago, USA), 5 pages, 5 figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Predictions for the Standard Model Effective Field Theory at the
next-to-leading order accuracy in QCD, including parton-shower effects, have
started to become available in the MadGraph5_aMC@NLO framework. In this talk we
summarize some recent results for $t\bar t$, single top, $t\bar tZ/\gamma$, and
$t\bar tH$ production channels at dimension six.
| [
{
"created": "Tue, 15 Nov 2016 22:59:07 GMT",
"version": "v1"
}
] | 2016-11-17 | [
[
"Zhang",
"Cen",
""
]
] | Predictions for the Standard Model Effective Field Theory at the next-to-leading order accuracy in QCD, including parton-shower effects, have started to become available in the MadGraph5_aMC@NLO framework. In this talk we summarize some recent results for $t\bar t$, single top, $t\bar tZ/\gamma$, and $t\bar tH$ production channels at dimension six. |
hep-ph/0210393 | Robert Foot | R. Foot | Are four neutrino models ruled out? | about 4 pages | Mod.Phys.Lett. A18 (2003) 2079-2082 | 10.1142/S0217732303011605 | null | hep-ph | null | We show explicitly that four neutrino models of the 2+2 variety still provide
an acceptable global fit to the solar, atmospheric and LSND neutrino data. The
goodness of fit, defined in the usual way, is found to be 0.26 for the simplest
such model. That is, we find that there is a 26% probability of obtaining a
worse global fit to the neutrino data We also make some specific comments on
the paper, ``Ruling out four-neutrino oscillation interpretations of the LSND
anomaly'' [hep-ph/0207157], and explain why they reached drastically different
conclusions.
| [
{
"created": "Tue, 29 Oct 2002 05:22:55 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Foot",
"R.",
""
]
] | We show explicitly that four neutrino models of the 2+2 variety still provide an acceptable global fit to the solar, atmospheric and LSND neutrino data. The goodness of fit, defined in the usual way, is found to be 0.26 for the simplest such model. That is, we find that there is a 26% probability of obtaining a worse global fit to the neutrino data We also make some specific comments on the paper, ``Ruling out four-neutrino oscillation interpretations of the LSND anomaly'' [hep-ph/0207157], and explain why they reached drastically different conclusions. |
0811.1175 | Walter Winter | Walter Winter | Long baseline neutrino oscillations: Theoretical aspects | 6 pages, 1 figure. Talk given at the NOW 2008 workshop, Otranto,
Italy | Nucl.Phys.Proc.Suppl.188:151-157,2009 | 10.1016/j.nuclphysbps.2009.02.036 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the measurement of the neutrino oscillation parameters at future
long baseline experiments in terms of the motivation of the experiments, the
quantities of interest from the theoretical point of view, the phenomenology of
these experiments, and the experiment choice. We illustrate the oscillation
physics potential of a neutrino factory, as a representative for the most
challenging technologies. Finally, we point out that a future neutrino
oscillation facility might also be affected by the unexpected.
| [
{
"created": "Fri, 7 Nov 2008 16:38:45 GMT",
"version": "v1"
}
] | 2009-04-17 | [
[
"Winter",
"Walter",
""
]
] | We discuss the measurement of the neutrino oscillation parameters at future long baseline experiments in terms of the motivation of the experiments, the quantities of interest from the theoretical point of view, the phenomenology of these experiments, and the experiment choice. We illustrate the oscillation physics potential of a neutrino factory, as a representative for the most challenging technologies. Finally, we point out that a future neutrino oscillation facility might also be affected by the unexpected. |
2305.09976 | Yaroslav Krivenko-Emetov D | Yaroslav D. Krivenko-Emetov, Andriy I. Smetana | Chemical potential of a hadronic fireball in the freeze-out stage | 17 pages, 9 figures, XXI UKRAINIAN SCIENTIFIC AND PRACTICAL
CONFERENCE STUDENTS, GRADUATE STUDENTS AND YOUNG SCIENTISTS THEORETICAL AND
APPLIED PROBLEMS PHYSICS, MATHEMATICS AND INFORMATICS (May 11 - 12, 2023,
Kyiv, Ukraine). arXiv admin note: text overlap with arXiv:2301.00742 | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article explores the van der Waals gas model proposed to describe the
hadronic stages of nuclear fireball evolution during the cooling stage. Two
different models were proposed for the early and late stages of hadronization.
At the initial stage, a two-component meson model consisting of $\pi^0$ and
$\pi^+$ mesons was suggested, and at the later stage, a two-component nucleon
model consisting of protons and neutrons was proposed. The interaction
potential for both models was represented by a rectangular well, and the
statistical sum was calculated using the saddle-point method. The analytic
expressions for pressure and chemical potentials obtained from the model were
compared with the corresponding numerical results of other authors obtained
earlier using quantum chromodynamics (QCD) methods. The possibility of applying
and using the effective chemical potential is also analyzed.
| [
{
"created": "Wed, 17 May 2023 06:15:47 GMT",
"version": "v1"
}
] | 2023-05-18 | [
[
"Krivenko-Emetov",
"Yaroslav D.",
""
],
[
"Smetana",
"Andriy I.",
""
]
] | This article explores the van der Waals gas model proposed to describe the hadronic stages of nuclear fireball evolution during the cooling stage. Two different models were proposed for the early and late stages of hadronization. At the initial stage, a two-component meson model consisting of $\pi^0$ and $\pi^+$ mesons was suggested, and at the later stage, a two-component nucleon model consisting of protons and neutrons was proposed. The interaction potential for both models was represented by a rectangular well, and the statistical sum was calculated using the saddle-point method. The analytic expressions for pressure and chemical potentials obtained from the model were compared with the corresponding numerical results of other authors obtained earlier using quantum chromodynamics (QCD) methods. The possibility of applying and using the effective chemical potential is also analyzed. |
hep-ph/0212245 | K. S. Babu | K.S. Babu, Ilia Gogoladze and Kai Wang (Oklahoma State University) | Natural R-Parity, \mu-term, and Fermion Mass Hierarchy From Discrete
Gauge Symmetries | 22 pages, LaTeX | Nucl.Phys. B660 (2003) 322-342 | 10.1016/S0550-3213(03)00258-X | OSU-HEP-02-17 | hep-ph | null | In the minimal supersymmetric Standard Model with seesaw neutrino masses we
show how R-parity can emerge naturally as a discrete gauge symmetry. The same
discrete symmetry explains the smallness of the \mu-term (the Higgsino mass
parameter) via the Giudice--Masiero mechanism. The discrete gauge anomalies are
cancelled by a discrete version of the Green--Schwarz mechanism. The simplest
symmetry group is found to be Z_4 with a charge assignment that is compatible
with grand unification. Several other Z_N gauge symmetries are found for
N=10,12,18,36 etc, with some models employing discrete anomaly cancellation at
higher Kac-Moody levels. Allowing for a flavor structure in Z_N, we show that
the same gauge symmetry can also explain the observed hierarchy in the fermion
masses and mixings.
| [
{
"created": "Tue, 17 Dec 2002 11:10:02 GMT",
"version": "v1"
}
] | 2010-04-05 | [
[
"Babu",
"K. S.",
"",
"Oklahoma State University"
],
[
"Gogoladze",
"Ilia",
"",
"Oklahoma State University"
],
[
"Wang",
"Kai",
"",
"Oklahoma State University"
]
] | In the minimal supersymmetric Standard Model with seesaw neutrino masses we show how R-parity can emerge naturally as a discrete gauge symmetry. The same discrete symmetry explains the smallness of the \mu-term (the Higgsino mass parameter) via the Giudice--Masiero mechanism. The discrete gauge anomalies are cancelled by a discrete version of the Green--Schwarz mechanism. The simplest symmetry group is found to be Z_4 with a charge assignment that is compatible with grand unification. Several other Z_N gauge symmetries are found for N=10,12,18,36 etc, with some models employing discrete anomaly cancellation at higher Kac-Moody levels. Allowing for a flavor structure in Z_N, we show that the same gauge symmetry can also explain the observed hierarchy in the fermion masses and mixings. |
hep-ph/9310349 | Tom Gould | K.S. Babu, T.M. Gould, and I.Z. Rothstein | Closing the Windows on Mev Tau Neutrinos | 8 pgs. LaTeX (1 uuencoded fig., also available on request),
Bartol-930XXX, JHU-TIPAC-930026, UM-TH-93-26 | Phys.Lett.B321:140-144,1994 | 10.1016/0370-2693(94)90340-9 | null | hep-ph | null | In this note, we analyze various constraints on the ``visible'' decay modes
of a massive $\tau $ neutrino, $\nu_\tau\rightarrow\nu^\prime\,\gamma $ and
$\nu_\tau\rightarrow\nu^\prime\, e^+ e^-$, where $\nu^\prime$ is a light
neutrino. The BEBC beam dump experiment provides model-independent constraints
on these modes. The lifetime for the $\nu^\prime\, e^+e^-$ mode is constrained
to be $\tau_{\nu^\prime\, e^+e^-} \ge 0.18~(m_{\nu_\tau}/MeV)~sec.$ We point
out that the same experiment implies a similar constraint on the
$\nu^\prime\,\gamma$ mode. This results in a new upper limit on the transition
magnetic moment of $\nu_\tau$, $\mu_{\rm tran} \le 1.1 \times 10^{-9}
(MeV/m_{\nu_\tau})^2 \mu_B $. Furthermore, a limit on the electric charge of
$\nu_\tau$ may be obtained, $Q_{\nu_\tau} \le 4 \times 10^{-4}e$. Combining
these constraints with those arising from supernova observations and primordial
nucleosynthesis calculations, we show that these ``visible'' decays cannot be
the dominant decay modes of the $\tau$ neutrino.
| [
{
"created": "Tue, 26 Oct 1993 03:47:52 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Babu",
"K. S.",
""
],
[
"Gould",
"T. M.",
""
],
[
"Rothstein",
"I. Z.",
""
]
] | In this note, we analyze various constraints on the ``visible'' decay modes of a massive $\tau $ neutrino, $\nu_\tau\rightarrow\nu^\prime\,\gamma $ and $\nu_\tau\rightarrow\nu^\prime\, e^+ e^-$, where $\nu^\prime$ is a light neutrino. The BEBC beam dump experiment provides model-independent constraints on these modes. The lifetime for the $\nu^\prime\, e^+e^-$ mode is constrained to be $\tau_{\nu^\prime\, e^+e^-} \ge 0.18~(m_{\nu_\tau}/MeV)~sec.$ We point out that the same experiment implies a similar constraint on the $\nu^\prime\,\gamma$ mode. This results in a new upper limit on the transition magnetic moment of $\nu_\tau$, $\mu_{\rm tran} \le 1.1 \times 10^{-9} (MeV/m_{\nu_\tau})^2 \mu_B $. Furthermore, a limit on the electric charge of $\nu_\tau$ may be obtained, $Q_{\nu_\tau} \le 4 \times 10^{-4}e$. Combining these constraints with those arising from supernova observations and primordial nucleosynthesis calculations, we show that these ``visible'' decays cannot be the dominant decay modes of the $\tau$ neutrino. |
1105.5801 | Hao Ma | Hao Ma, Carlos A. Salgado and Konrad Tywoniuk | Medium-induced multi-photon radiation | 5 pages, 1 figure. Proceedings of Hot Quarks 2010, La Londe Les
Maures, France | J. Phys.: Conf. Ser. 270 012034, 2011 | 10.1088/1742-6596/270/1/012034 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the spectrum of multi-photon radiation off a fast quark in medium in
the BDMPS/ASW approach. We reproduce the medium-induced one-photon radiation
spectrum in dipole approximation, and go on to calculate the two-photon
radiation in the Moli\`{e}re limit. We find that in this limit the LPM effect
holds for medium-induced two-photon ladder emission.
| [
{
"created": "Sun, 29 May 2011 16:37:07 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Ma",
"Hao",
""
],
[
"Salgado",
"Carlos A.",
""
],
[
"Tywoniuk",
"Konrad",
""
]
] | We study the spectrum of multi-photon radiation off a fast quark in medium in the BDMPS/ASW approach. We reproduce the medium-induced one-photon radiation spectrum in dipole approximation, and go on to calculate the two-photon radiation in the Moli\`{e}re limit. We find that in this limit the LPM effect holds for medium-induced two-photon ladder emission. |
hep-ph/0412227 | Azad Ahmedov | R.Kh.Muradov and A.I.Ahmadov | Contribution superstring Z' boson on the polarization effects in
proton-proton collisions | 25 pages, 9 figures, LaTeX2e | Central Eur.J.Phys. 3 (2005) 433-455 | 10.2478/BF02475649 | null | hep-ph | null | In this work we investigate the single- and the double- spin asymmetries at
the collisions of polarized protons $pp \to (\gamma*, Z^0,Z')+X within the
scope of QCD, electroweak interaction and superstring E_6 theory. The helicity
amplitude method is used. Analytical expressions for the single- and the
double- spin asymmetries are obtained and their dependence from the transverse
momentum of lepton pair is investigated at the three different values of
invariant masses of lepton pair. Has been extracted pure contribution coming
from superstring Z' boson on the single- and double- spin asymmetries. The
obtained results allow to investigate the spin structure of the proton.
| [
{
"created": "Thu, 16 Dec 2004 09:14:54 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Jul 2005 12:28:52 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Muradov",
"R. Kh.",
""
],
[
"Ahmadov",
"A. I.",
""
]
] | In this work we investigate the single- and the double- spin asymmetries at the collisions of polarized protons $pp \to (\gamma*, Z^0,Z')+X within the scope of QCD, electroweak interaction and superstring E_6 theory. The helicity amplitude method is used. Analytical expressions for the single- and the double- spin asymmetries are obtained and their dependence from the transverse momentum of lepton pair is investigated at the three different values of invariant masses of lepton pair. Has been extracted pure contribution coming from superstring Z' boson on the single- and double- spin asymmetries. The obtained results allow to investigate the spin structure of the proton. |
0810.2572 | Cyrille Marquet | Cyrille Marquet | Heavy-quark energy loss in pQCD and SYM plasmas | 5 pages, 2 figures, Proceedings of the IIIrd Workshop for Young
Scientists on the Physics of Ultrarelativistic Nucleus-Nucleus Collisions
(HotQuarks08), Estes Park, USA, August 18-23 2008 | Eur.Phys.J.C62:15-20,2009 | 10.1140/epjc/s10052-009-1014-2 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider heavy-quark energy loss and pT-broadening in a strongly-coupled
N=4 Super Yang Mills (SYM) plasma, and the problem of finite-extend matter is
addressed. When expressed in terms of the appropriate saturation momentum, one
finds identical parametric forms for the energy loss in pQCD and SYM theory,
while pT-broadening is radiation dominated in SYM theory and multiple
scattering dominated in pQCD.
| [
{
"created": "Tue, 14 Oct 2008 22:32:26 GMT",
"version": "v1"
}
] | 2009-07-22 | [
[
"Marquet",
"Cyrille",
""
]
] | We consider heavy-quark energy loss and pT-broadening in a strongly-coupled N=4 Super Yang Mills (SYM) plasma, and the problem of finite-extend matter is addressed. When expressed in terms of the appropriate saturation momentum, one finds identical parametric forms for the energy loss in pQCD and SYM theory, while pT-broadening is radiation dominated in SYM theory and multiple scattering dominated in pQCD. |
hep-ph/9608338 | Wolfgang Schaefer | N. N. Nikolaev (1,2,3), W. Schaefer (2), B. G. Zakharov (3) ((1) ITKP
Bonn, (2) IKP,KFA-Juelich, (3) Landau Inst.) | Diffractive DIS: back to triple-Regge phenomenology? | 18 pages LaTeX, including 6 eps-figures, uses epsfig-macro, revised
version: a factor of 1/3 in eq.(10) was corrected, and a more detailed
discussion of the effect of the x_Pom-beta correlation added | null | null | KFA-IKP(Th)-1996-06 | hep-ph | null | We discuss the factorization breaking effects caused by the contribution to
large rapidity gap events from DIS on secondary reggeons. Based on the
triple-Regge phenomenology of hadronic diffraction dissociation, we present
estimates for the flux and structure function of the f reggeon. The kinematical
x_Pom-beta correlation is shown to modify substantially the observed x_Pom
dependence of the diffractive structure function. The secondary reggeon and
x_Pom-beta correlation effects explain the recent H1 finding of the
factorization breaking and resolve the apparent contradiction between the
preliminary H1 results and predictions from the color dipole gBFKL approach. We
suggest further tests of predictions for diffractive DIS from the gBFKL
approach.
| [
{
"created": "Thu, 15 Aug 1996 16:00:34 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Aug 1996 14:13:30 GMT",
"version": "v2"
},
{
"created": "Fri, 23 Aug 1996 11:49:04 GMT",
"version": "v3"
}
] | 2008-02-03 | [
[
"Nikolaev",
"N. N.",
""
],
[
"Schaefer",
"W.",
""
],
[
"Zakharov",
"B. G.",
""
]
] | We discuss the factorization breaking effects caused by the contribution to large rapidity gap events from DIS on secondary reggeons. Based on the triple-Regge phenomenology of hadronic diffraction dissociation, we present estimates for the flux and structure function of the f reggeon. The kinematical x_Pom-beta correlation is shown to modify substantially the observed x_Pom dependence of the diffractive structure function. The secondary reggeon and x_Pom-beta correlation effects explain the recent H1 finding of the factorization breaking and resolve the apparent contradiction between the preliminary H1 results and predictions from the color dipole gBFKL approach. We suggest further tests of predictions for diffractive DIS from the gBFKL approach. |
hep-ph/0204115 | Hannes Jung | The Small x Collaboration: Bo Andersson, S. Baranov, J. Bartels, M.
Ciafaloni, J. Collins, M. Davidsson, G. Gustafson, H. Jung, L. Joensson, M.
Karlsson, M. Kimber, A. Kotikov, J. Kwiecinski, L. Loennblad, G. Miu, G.
Salam, M.H. Seymour, T. Sjoestrand, N. Zotov | Small x Phenomenology: Summary and Status | 4 tables, 10 figures | Eur.Phys.J.C25:77-101,2002 | 10.1007/s10052-002-0998-7 | null | hep-ph | null | The aim of this paper is to summarize the general status of our understanding
of small x physics. It is based on presentations and discussions at an informal
meeting on this topic held in Lund, Sweden, in March 2001. This document also
marks the founding of an informal collaboration between experimentalists and
theoreticians with a special interest in small x physics.
This paper is dedicated to the memory of Bo Andersson, who died unexpectedly
from a heart attack on March 4th, 2002.
| [
{
"created": "Wed, 10 Apr 2002 07:29:10 GMT",
"version": "v1"
},
{
"created": "Fri, 17 May 2002 12:15:42 GMT",
"version": "v2"
}
] | 2019-08-17 | [
[
"The Small x Collaboration",
"",
""
],
[
"Andersson",
"Bo",
""
],
[
"Baranov",
"S.",
""
],
[
"Bartels",
"J.",
""
],
[
"Ciafaloni",
"M.",
""
],
[
"Collins",
"J.",
""
],
[
"Davidsson",
"M.",
""
],
[
"... | The aim of this paper is to summarize the general status of our understanding of small x physics. It is based on presentations and discussions at an informal meeting on this topic held in Lund, Sweden, in March 2001. This document also marks the founding of an informal collaboration between experimentalists and theoreticians with a special interest in small x physics. This paper is dedicated to the memory of Bo Andersson, who died unexpectedly from a heart attack on March 4th, 2002. |
1106.1997 | Juan Rojo | Juan Rojo | Parton Distributions and LHC data | 8 pages, 9 figures, proceedings of the "Rencontres de physique de la
Vallee d'Aoste", La Thuile, March 2011 | null | 10.1393/ncc/i2012-11118-8 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this contribution we briefly report on the progress and open problems in
parton distribution functions (PDFs), with emphasis on their implications for
LHC phenomenology. Then we study the impact of the recent ATLAS and CMS W
lepton asymmetry data on the NNPDF2.1 parton distributions. We show that these
data provide the first constrains on PDFs from LHC measurements.
| [
{
"created": "Fri, 10 Jun 2011 09:55:00 GMT",
"version": "v1"
}
] | 2022-03-02 | [
[
"Rojo",
"Juan",
""
]
] | In this contribution we briefly report on the progress and open problems in parton distribution functions (PDFs), with emphasis on their implications for LHC phenomenology. Then we study the impact of the recent ATLAS and CMS W lepton asymmetry data on the NNPDF2.1 parton distributions. We show that these data provide the first constrains on PDFs from LHC measurements. |
2210.10017 | Fayyazuddin Fayyazuddin | Fayyazuddin | W-exchange contribution in hadronic decays of bottom baryon | No figure | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The nonleptonic decays of \Lambda_{b} that are dominated by W exchange are
studied. In particular, the decay modes
\varLambda_{b}\to\varDelta^{0}D^{0},\varDelta^{-}D^{+},\Sigma^{*-}D_{s}^{+},
\Lambda_{b}\to\Sigma_{c}^{*+}\pi^{-},\Sigma_{c}^{*0}\pi^{0},\Xi_{c}^{*0}K^{0}
and \varLambda_{b}\to\Sigma_{c}^{+}\pi^{-} are analyzed. In an another aspect,
the decay \Lambda_{b}\to\Lambda_{c}^{+}\pi^{-} in the factorization anstaz is
studied. It is shown that factorization contributes to parity-violating
(s-wave) amplitude A only. Hence factorization gives asymmetry parameter
\alpha=0. However, the dominant contribution to parity conserving (p-wave)
amplitude B comes from W exchange, i.e., from the baryon pole, giving asymmetry
parameter \alpha=-0.77.
| [
{
"created": "Tue, 18 Oct 2022 17:36:14 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jan 2023 03:57:08 GMT",
"version": "v2"
},
{
"created": "Mon, 28 Aug 2023 03:41:05 GMT",
"version": "v3"
}
] | 2023-08-29 | [
[
"Fayyazuddin",
"",
""
]
] | The nonleptonic decays of \Lambda_{b} that are dominated by W exchange are studied. In particular, the decay modes \varLambda_{b}\to\varDelta^{0}D^{0},\varDelta^{-}D^{+},\Sigma^{*-}D_{s}^{+}, \Lambda_{b}\to\Sigma_{c}^{*+}\pi^{-},\Sigma_{c}^{*0}\pi^{0},\Xi_{c}^{*0}K^{0} and \varLambda_{b}\to\Sigma_{c}^{+}\pi^{-} are analyzed. In an another aspect, the decay \Lambda_{b}\to\Lambda_{c}^{+}\pi^{-} in the factorization anstaz is studied. It is shown that factorization contributes to parity-violating (s-wave) amplitude A only. Hence factorization gives asymmetry parameter \alpha=0. However, the dominant contribution to parity conserving (p-wave) amplitude B comes from W exchange, i.e., from the baryon pole, giving asymmetry parameter \alpha=-0.77. |
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