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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1108.2772
|
Klaus Schubert
|
Klaus R. Schubert and J\"urgen Stiewe
|
Demonstration of K-Kbar, B-Bbar, and D-Dbar Transitions with a Pair of
Coupled Pendula
|
15 pages, 6 figures
| null |
10.1088/0954-3899/39/3/033101
| null |
hep-ph physics.class-ph physics.pop-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A setup of two coupled and damped pendula is used to demonstrate the main
features of transitions beween neutral K, D, B mesons and their respective
antiparticles, including CP violation in K Kbar transitions. The transitions
are described by two-state Schr\"odinger equations. Since the real parts of
their solutions obey the same differential equations as the pendula
coordinates, the pendulum motions can be used to represent the meson
transitions. Video clips of the motions are attached as supplementary material.
|
[
{
"created": "Sat, 13 Aug 2011 07:44:11 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Dec 2011 10:34:44 GMT",
"version": "v2"
}
] |
2015-05-30
|
[
[
"Schubert",
"Klaus R.",
""
],
[
"Stiewe",
"Jürgen",
""
]
] |
A setup of two coupled and damped pendula is used to demonstrate the main features of transitions beween neutral K, D, B mesons and their respective antiparticles, including CP violation in K Kbar transitions. The transitions are described by two-state Schr\"odinger equations. Since the real parts of their solutions obey the same differential equations as the pendula coordinates, the pendulum motions can be used to represent the meson transitions. Video clips of the motions are attached as supplementary material.
|
hep-ph/0102259
|
Xiong Zhao-hua
|
Z. Xiong, J. M. Yang (Institute of Theoretical Physics, Academia
Sinica)
|
Muon anomalous magnetic moment in technicolor models
|
refs and comments added
|
Phys.Lett. B508 (2001) 295-300
|
10.1016/S0370-2693(01)00521-4
| null |
hep-ph
| null |
Contributions to the muon anomalous magnetic moment are evaluated in the
technicolor model with scalars and topcolor assisted technicolor model. In the
technicolor model with scalars, the additional contributions come from the
loops of scalars, which were found sizable only for a very large $f/f^{'}$
disfavored by the experiment of $b\to s\gamma$. The topcolor effect is also
found to be large only for an unnaturally large $\tan\theta'$, and thus the
previously evaluated loop effects of extended technicolor bosons, suppressed by
$m_{\mu}^2/M_{ETC}^2$, must be resorted to account for the E821 experiment. So,
if the E821 experiment result persists, it would be a challenge to technicolor
models.
|
[
{
"created": "Wed, 21 Feb 2001 03:34:16 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Feb 2001 08:44:59 GMT",
"version": "v2"
},
{
"created": "Fri, 9 Mar 2001 09:53:10 GMT",
"version": "v3"
}
] |
2009-11-07
|
[
[
"Xiong",
"Z.",
"",
"Institute of Theoretical Physics, Academia\n Sinica"
],
[
"Yang",
"J. M.",
"",
"Institute of Theoretical Physics, Academia\n Sinica"
]
] |
Contributions to the muon anomalous magnetic moment are evaluated in the technicolor model with scalars and topcolor assisted technicolor model. In the technicolor model with scalars, the additional contributions come from the loops of scalars, which were found sizable only for a very large $f/f^{'}$ disfavored by the experiment of $b\to s\gamma$. The topcolor effect is also found to be large only for an unnaturally large $\tan\theta'$, and thus the previously evaluated loop effects of extended technicolor bosons, suppressed by $m_{\mu}^2/M_{ETC}^2$, must be resorted to account for the E821 experiment. So, if the E821 experiment result persists, it would be a challenge to technicolor models.
|
1106.1599
|
Mosleh Almarashi
|
Mosleh M. Almarashi and Stefano Moretti
|
Reinforcing the no-lose theorem for NMSSM Higgs discovery at the LHC
|
19 pages, 9 figures, added comments and corrected typos
|
Phys.Rev.D84:035009,2011
|
10.1103/PhysRevD.84.035009
|
SHEP-11-13
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show the potential of the LHC to detect a CP-even Higgs boson of the
NMSSM, $h_1$ or $h_2$, decaying into two rather light CP-odd Higgs bosons,
$a_1$, by exploiting the production mode based on Higgs-strahlung off
$b$-quarks, i.e., the channel $pp\to b\bar b h_{1,2}$. We also consider the
case of $h_2\to h_1 h_1$ decays. It is found that these decays have dominant
BRs over large regions of the NMSSM parameter space where tan$\beta$ is large,
a condition which also favours the $pp\to b\bar b h_{1,2}$ production rates.
Further decays of the light Higgs boson pairs ($a_1$ and $h_1$) into photon,
muon, tau and $b$ final states are also considered. The overall production and
decay rates for these processes at inclusive level are sizable and should help
extracting at least one Higgs boson signal over the NMSSM parameter space.
|
[
{
"created": "Wed, 8 Jun 2011 17:01:38 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jul 2011 15:54:00 GMT",
"version": "v2"
}
] |
2011-09-08
|
[
[
"Almarashi",
"Mosleh M.",
""
],
[
"Moretti",
"Stefano",
""
]
] |
We show the potential of the LHC to detect a CP-even Higgs boson of the NMSSM, $h_1$ or $h_2$, decaying into two rather light CP-odd Higgs bosons, $a_1$, by exploiting the production mode based on Higgs-strahlung off $b$-quarks, i.e., the channel $pp\to b\bar b h_{1,2}$. We also consider the case of $h_2\to h_1 h_1$ decays. It is found that these decays have dominant BRs over large regions of the NMSSM parameter space where tan$\beta$ is large, a condition which also favours the $pp\to b\bar b h_{1,2}$ production rates. Further decays of the light Higgs boson pairs ($a_1$ and $h_1$) into photon, muon, tau and $b$ final states are also considered. The overall production and decay rates for these processes at inclusive level are sizable and should help extracting at least one Higgs boson signal over the NMSSM parameter space.
|
1305.2921
|
Angelo Monteux
|
Angelo Monteux (University of California, Santa Cruz)
|
Natural, R-parity violating supersymmetry and horizontal flavor
symmetries
|
v3: version accepted for publication on PRD. Expanded discussion
about the NMSSM and neutrinos, references added, minor clarifications,
conclusions unchanged. 35 pages, revtex4.1
|
Phys. Rev. D 88, 045029 (2013)
|
10.1103/PhysRevD.88.045029
|
SCIPP 13/08
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The absence so far of any supersymmetric signals at the LHC pushes towards a
rethinking of the assumptions underlying the MSSM. Because the large missing
$E_T$ searches are inadequate to detect a LSP decaying within the detector,
R-parity violating supersymmetry is still a good candidate for low energy,
natural supersymmetry. We show that, in Froggatt-Nielsen-like models of
horizontal symmetries, specific textures for the R-parity violating couplings
are dictated by the symmetry, with the largest coupling involving the third
generation fields. Lepton number can be an accidental symmetry of the
renormalizable superpotential and barion number violation is given by a $\bar
u\bar d\bar d$ operator. The collider phenomenology then mimics the main
features of MFV R-parity violating supersymmetry. The LSP can evade current LHC
supersymmetry searches, is allowed to be well below 1 TeV and at the same time
all the constraints from proton decay and other low energy decays can be
satisfied; in particular, dimension five operators allowed by R-parity but
dangerous for the proton are under control, while neutrino masses are generated
by the Weinberg operator. Assuming sub TeV ({\it natural}) superpartners, we
obtain both upper and lower limits on the magnitude of the dominant R-parity
violating coupling: a lower limit of order $10^{-9}$ arises from null LHC
searches on R-hadrons and heavy stable charged particles, while a upper limit
of order $10^{-3}$ follows from constraints on low-energy flavor changing
neutral currents. Displaced vertices are predicted in the lower end of this
range.
|
[
{
"created": "Mon, 13 May 2013 20:00:04 GMT",
"version": "v1"
},
{
"created": "Tue, 28 May 2013 16:15:04 GMT",
"version": "v2"
},
{
"created": "Tue, 6 Aug 2013 20:56:44 GMT",
"version": "v3"
}
] |
2013-08-30
|
[
[
"Monteux",
"Angelo",
"",
"University of California, Santa Cruz"
]
] |
The absence so far of any supersymmetric signals at the LHC pushes towards a rethinking of the assumptions underlying the MSSM. Because the large missing $E_T$ searches are inadequate to detect a LSP decaying within the detector, R-parity violating supersymmetry is still a good candidate for low energy, natural supersymmetry. We show that, in Froggatt-Nielsen-like models of horizontal symmetries, specific textures for the R-parity violating couplings are dictated by the symmetry, with the largest coupling involving the third generation fields. Lepton number can be an accidental symmetry of the renormalizable superpotential and barion number violation is given by a $\bar u\bar d\bar d$ operator. The collider phenomenology then mimics the main features of MFV R-parity violating supersymmetry. The LSP can evade current LHC supersymmetry searches, is allowed to be well below 1 TeV and at the same time all the constraints from proton decay and other low energy decays can be satisfied; in particular, dimension five operators allowed by R-parity but dangerous for the proton are under control, while neutrino masses are generated by the Weinberg operator. Assuming sub TeV ({\it natural}) superpartners, we obtain both upper and lower limits on the magnitude of the dominant R-parity violating coupling: a lower limit of order $10^{-9}$ arises from null LHC searches on R-hadrons and heavy stable charged particles, while a upper limit of order $10^{-3}$ follows from constraints on low-energy flavor changing neutral currents. Displaced vertices are predicted in the lower end of this range.
|
hep-ph/9911472
|
A. Shuvaev
|
M. G. Ryskin and A. G. Shuvaev
|
Classical pion fields in the presence of source
|
10 pages, LaTeX, 1 figure, epsfig.sty, corrected typos, added
references
|
Phys.Atom.Nucl. 64 (2001) 1508-1512; Yad.Fiz. 64 (2001) 1584-1588
|
10.1134/1.1398944
| null |
hep-ph
| null |
Classical pion field similar to Disoriented Chiral Condensate (DCC) is
considered in the presence of the external source. This field is similar to DCC
in the sense that its isotopic orientation is specified with a single vector at
the whole space. We study the classical field solutions in the nonlinear
sigma-model both in the chiral limit with massless pion and for the finite pion
mass. In both cases the field resembles the Coulomb field of charged particle
however the nonlinear pion interactions lead to the existence of several
solutions. In the massless case and for the very small size of the source there
is the lot of classical solutions with finite discrete energies. In the more
realistic situation of large nucleus (heavy ion) there are no stable solutions
of the above type, but there is the possibility for the formation of the
quasistationary states. They can live for a long time slowly decaying through
the emission of very soft pions. The structure and the energies of these
solutions is investigated numerically.
|
[
{
"created": "Wed, 24 Nov 1999 17:03:06 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Feb 2000 10:33:48 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Ryskin",
"M. G.",
""
],
[
"Shuvaev",
"A. G.",
""
]
] |
Classical pion field similar to Disoriented Chiral Condensate (DCC) is considered in the presence of the external source. This field is similar to DCC in the sense that its isotopic orientation is specified with a single vector at the whole space. We study the classical field solutions in the nonlinear sigma-model both in the chiral limit with massless pion and for the finite pion mass. In both cases the field resembles the Coulomb field of charged particle however the nonlinear pion interactions lead to the existence of several solutions. In the massless case and for the very small size of the source there is the lot of classical solutions with finite discrete energies. In the more realistic situation of large nucleus (heavy ion) there are no stable solutions of the above type, but there is the possibility for the formation of the quasistationary states. They can live for a long time slowly decaying through the emission of very soft pions. The structure and the energies of these solutions is investigated numerically.
|
hep-ph/0408252
|
Xing Gang Wu
|
Tao Huang and Xing-Gang Wu
|
A Model for the Twist-3 Wave Function of the Pion and Its Contribution
to the Pion Form Factor
|
22pages,4 figures. Phys.Rev. D70, 093013(2004) (in press)
|
Phys.Rev. D70 (2004) 093013
|
10.1103/PhysRevD.70.093013
| null |
hep-ph
| null |
A model for the twist-3 wave function $\psi_p(x,\mathbf{k_\perp})$ of the
pion has been constructed based on the moment calculation by applying the QCD
sum rules, whose distribution amplitude has a better end-point behavior than
that of the asymptotic one. With this model wave function, the twist-3
contributions including both the usual helicity components
($\lambda_1+\lambda_2=0$) and the higher helicity components
($\lambda_1+\lambda_2=\pm 1$) to the pion form factor have been studied within
the modified pQCD approach. Our results show that the twist-3 contribution
drops fast and it becomes less than the twist-2 contribution at $Q^2\sim
10GeV^2$. The higher helicity components in the twist-3 wave function will give
an extra suppression to the pion form factor. The model dependence of the
twist-3 contribution to the pion form factor has been studied by comparing
three different models. When all the power contributions, which include higher
order in $\alpha_s$, higher helicities, higher twists in DA and etc., have been
taken into account, it is expected that the hard contributions will fit the
present experimental data well at the energy region where pQCD is applicable.
|
[
{
"created": "Tue, 24 Aug 2004 03:34:54 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Oct 2004 04:35:48 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Nov 2004 00:07:44 GMT",
"version": "v3"
}
] |
2009-11-10
|
[
[
"Huang",
"Tao",
""
],
[
"Wu",
"Xing-Gang",
""
]
] |
A model for the twist-3 wave function $\psi_p(x,\mathbf{k_\perp})$ of the pion has been constructed based on the moment calculation by applying the QCD sum rules, whose distribution amplitude has a better end-point behavior than that of the asymptotic one. With this model wave function, the twist-3 contributions including both the usual helicity components ($\lambda_1+\lambda_2=0$) and the higher helicity components ($\lambda_1+\lambda_2=\pm 1$) to the pion form factor have been studied within the modified pQCD approach. Our results show that the twist-3 contribution drops fast and it becomes less than the twist-2 contribution at $Q^2\sim 10GeV^2$. The higher helicity components in the twist-3 wave function will give an extra suppression to the pion form factor. The model dependence of the twist-3 contribution to the pion form factor has been studied by comparing three different models. When all the power contributions, which include higher order in $\alpha_s$, higher helicities, higher twists in DA and etc., have been taken into account, it is expected that the hard contributions will fit the present experimental data well at the energy region where pQCD is applicable.
|
hep-ph/9606463
|
Bruce Campbell
|
Rouzbeh Allahverdi and Bruce A. Campbell
|
Cosmological Reheating and Self-Interacting Final State Bosons
|
17 pages LaTeX, accepted for publication in Physics Letters B,
extended discussion of broad-band resonance regime, and references added
|
Phys.Lett. B395 (1997) 169-177
|
10.1016/S0370-2693(97)00045-2
|
Alberta-THY-18/96
|
hep-ph
| null |
We consider inflaton decay to final state bosons with self-interactions of
moderate strength. We find that such final state self-interactions
qualitatively alter the reheat dynamics. In the case of narrow-band resonance
decay, where a quantitative analysis is possible, we show that these final
state interactions regulate the decay rate. The phenomenon of parametric
amplification is then effectively suppressed, and does not drastically enhance
the decay rate and reheat temperature. Detailed applications of our results to
realistic classes of inflationary models will be considered elsewhere.
|
[
{
"created": "Fri, 28 Jun 1996 04:02:30 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Dec 1996 20:46:58 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Allahverdi",
"Rouzbeh",
""
],
[
"Campbell",
"Bruce A.",
""
]
] |
We consider inflaton decay to final state bosons with self-interactions of moderate strength. We find that such final state self-interactions qualitatively alter the reheat dynamics. In the case of narrow-band resonance decay, where a quantitative analysis is possible, we show that these final state interactions regulate the decay rate. The phenomenon of parametric amplification is then effectively suppressed, and does not drastically enhance the decay rate and reheat temperature. Detailed applications of our results to realistic classes of inflationary models will be considered elsewhere.
|
2107.07840
|
Muhammad Waqas
|
M. Waqas, G. X. Peng, Z. Wazir
|
Decoupling of non-strange, strange and multi-strange particles from the
system in Cu-Cu, Au-Au and Pb-Pb collisions at high energies
| null | null |
10.1016/j.cjph.2022.03.034
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Transverse momentum spectra of the non-strange, strange and multi-strange
particles in central and peripheral Copper-Copper, Gold-Gold and Lead-Lead
collisions are analyzed by the blast wave model with Boltzmann Gibbs
statistics. The model results are approximately in agreement with the
experimental data measured by BRAHMS, STAR, SPS, NA 49 and WA 97 Collaborations
in special transverse momentum ranges. Bulk properties in terms of kinetic
freeze out temperature, transverse flow velocity and freezeout volume are
extracted from the transverse momentum spectra of the particles. Separate
freeze out temperatures are observed for the non-strange, strange and
multi-strange particles which maybe due to different reaction cross-sections of
the interacting particles and it reveals the triple kinetic freezeout scenario
in collisions at BRAHMS, STAR, SPS, NA 49 and WA 97 Collaborations, however the
transverse flow velocity and freezeout volume are mass dependent and they
decrease with the increasing the rest mass of the particles. Furthermore, the
kinetic freezeout temperature, transverse flow velocity and kinetic freezeout
volume in central nucleus-nucleus collisions are larger than those in
peripheral collisions. Besides, the larger kinetic freezeout temperature and
freezeout volume are observed in the most heaviest nuclei collisions,
indicating their dependence on the size of interacting system
|
[
{
"created": "Fri, 16 Jul 2021 12:00:36 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Aug 2021 15:24:04 GMT",
"version": "v2"
}
] |
2022-05-04
|
[
[
"Waqas",
"M.",
""
],
[
"Peng",
"G. X.",
""
],
[
"Wazir",
"Z.",
""
]
] |
Transverse momentum spectra of the non-strange, strange and multi-strange particles in central and peripheral Copper-Copper, Gold-Gold and Lead-Lead collisions are analyzed by the blast wave model with Boltzmann Gibbs statistics. The model results are approximately in agreement with the experimental data measured by BRAHMS, STAR, SPS, NA 49 and WA 97 Collaborations in special transverse momentum ranges. Bulk properties in terms of kinetic freeze out temperature, transverse flow velocity and freezeout volume are extracted from the transverse momentum spectra of the particles. Separate freeze out temperatures are observed for the non-strange, strange and multi-strange particles which maybe due to different reaction cross-sections of the interacting particles and it reveals the triple kinetic freezeout scenario in collisions at BRAHMS, STAR, SPS, NA 49 and WA 97 Collaborations, however the transverse flow velocity and freezeout volume are mass dependent and they decrease with the increasing the rest mass of the particles. Furthermore, the kinetic freezeout temperature, transverse flow velocity and kinetic freezeout volume in central nucleus-nucleus collisions are larger than those in peripheral collisions. Besides, the larger kinetic freezeout temperature and freezeout volume are observed in the most heaviest nuclei collisions, indicating their dependence on the size of interacting system
|
2205.02250
|
Tongyan Lin
|
Brian Campbell-Deem, Simon Knapen, Tongyan Lin, Ethan Villarama
|
Dark matter direct detection from the single phonon to the nuclear
recoil regime
|
28 pages, 16 figures; journal version with minor updates
| null |
10.1103/PhysRevD.106.036019
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In most direct detection experiments, the free nuclear recoil description of
dark matter scattering breaks down for masses $\lesssim$ 100 MeV, or when the
recoil energy is comparable to a few times the typical phonon energy. For dark
matter lighter than 1 MeV, scattering via excitation of a single phonon
dominates and has been computed previously, but for the intermediate mass range
or higher detector thresholds, multiphonon processes dominate. We perform the
first calculation of the scattering rate via multiphonon production for the
entire keV-GeV dark matter mass range, assuming a harmonic crystal target. We
provide an analytic description that connects the single phonon, multiphonon,
and the nuclear recoil regimes. Our results are implemented in the public
package $\texttt{DarkELF}$.
|
[
{
"created": "Wed, 4 May 2022 18:00:05 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Aug 2023 17:07:32 GMT",
"version": "v2"
}
] |
2023-08-28
|
[
[
"Campbell-Deem",
"Brian",
""
],
[
"Knapen",
"Simon",
""
],
[
"Lin",
"Tongyan",
""
],
[
"Villarama",
"Ethan",
""
]
] |
In most direct detection experiments, the free nuclear recoil description of dark matter scattering breaks down for masses $\lesssim$ 100 MeV, or when the recoil energy is comparable to a few times the typical phonon energy. For dark matter lighter than 1 MeV, scattering via excitation of a single phonon dominates and has been computed previously, but for the intermediate mass range or higher detector thresholds, multiphonon processes dominate. We perform the first calculation of the scattering rate via multiphonon production for the entire keV-GeV dark matter mass range, assuming a harmonic crystal target. We provide an analytic description that connects the single phonon, multiphonon, and the nuclear recoil regimes. Our results are implemented in the public package $\texttt{DarkELF}$.
|
1612.08822
|
Chen Cheng
|
Chen Cheng, Xiao-Yun Wang
|
The production of neutral $N^*(11052)$ resonance with hidden beauty from
$\pi^-p$ scattering
| null |
Adv. High Energy Phys. 2017 (2017) 9398732
|
10.1155/2017/9398732
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the discovery potential of the predicted neutral hidden beauty
$N^*(11052)$ resonance through $\pi^- p$ scattering within an effective
Lagrangian approach. Two reactions $\pi^-p\rightarrow K^-\Sigma^+$ and
$\pi^-p\rightarrow \eta_bn$ are studied in this work, with nucleon pole
exchange as the background. It is found that the contributions of the
$N^*(11052)$ resonance give clear peak structures in the magnitude of 1 $\mu b$
near the threshold of the $N^*(11052)$ in the total cross sections. The
numerical results indicate that the center of mass energy $W\simeq$ 11-11.1 GeV
would be a best energy window for searching the $N^*(11052)$ resonance, where
the $N^*(11052)$ signal can be easily distinguished from the background. The
COMPASS experiment at CERN's Super Proton Synchrotron (SPS) with pion beam of
$\simeq$ 280 GeV will be an ideal platform for searching the super-heavy
resonance with hidden beauty, which is hopeful to test the theoretical results.
|
[
{
"created": "Wed, 28 Dec 2016 08:13:13 GMT",
"version": "v1"
}
] |
2017-01-06
|
[
[
"Cheng",
"Chen",
""
],
[
"Wang",
"Xiao-Yun",
""
]
] |
We investigate the discovery potential of the predicted neutral hidden beauty $N^*(11052)$ resonance through $\pi^- p$ scattering within an effective Lagrangian approach. Two reactions $\pi^-p\rightarrow K^-\Sigma^+$ and $\pi^-p\rightarrow \eta_bn$ are studied in this work, with nucleon pole exchange as the background. It is found that the contributions of the $N^*(11052)$ resonance give clear peak structures in the magnitude of 1 $\mu b$ near the threshold of the $N^*(11052)$ in the total cross sections. The numerical results indicate that the center of mass energy $W\simeq$ 11-11.1 GeV would be a best energy window for searching the $N^*(11052)$ resonance, where the $N^*(11052)$ signal can be easily distinguished from the background. The COMPASS experiment at CERN's Super Proton Synchrotron (SPS) with pion beam of $\simeq$ 280 GeV will be an ideal platform for searching the super-heavy resonance with hidden beauty, which is hopeful to test the theoretical results.
|
1404.3670
|
Ralf Lehnert
|
Ralf Lehnert
|
Spacetime-symmetry violations: motivations, phenomenology, and tests
|
10 pages, 1 figure
|
Physics Procedia 17, 135 (2011)
|
10.1016/j.phpro.2011.06.029
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An important open question in fundamental physics concerns the nature of
spacetime at distance scales associated with the Planck length. The widespread
belief that probing such distances necessitates Planck-energy particles has
impeded phenomenological and experimental research in this context. However, it
has been realized that various theoretical approaches to underlying physics can
accommodate Planck-scale violations of spacetime symmetries. This talk surveys
the motivations for spacetime-symmetry research, the SME test framework, and
experimental efforts in this field.
|
[
{
"created": "Mon, 14 Apr 2014 17:57:36 GMT",
"version": "v1"
}
] |
2014-04-15
|
[
[
"Lehnert",
"Ralf",
""
]
] |
An important open question in fundamental physics concerns the nature of spacetime at distance scales associated with the Planck length. The widespread belief that probing such distances necessitates Planck-energy particles has impeded phenomenological and experimental research in this context. However, it has been realized that various theoretical approaches to underlying physics can accommodate Planck-scale violations of spacetime symmetries. This talk surveys the motivations for spacetime-symmetry research, the SME test framework, and experimental efforts in this field.
|
0802.0769
|
Allen Caldwell
|
Allen Caldwell
|
Behavior of sigma(gamma p) at Large Coherence Lengths
|
34 pages, 20 figures
| null | null | null |
hep-ph
| null |
Various parametrizations of sigma(gamma p) are tried out on the small-x fixed
target and HERA data. A two-Pomeron type parametrization is found to give the
best reproduction of the data. The data indicate that the value of lambda(eff)
for parametrizations of the form sigma(gamma p)~l^lambda(eff) approaches a
constant value at high Q^2. The extrapolated values of sigma(gamma p) to very
long coherence lengths are found to cross in some parametrizations for l>10^7
fm, indicating the possibility that sigma(gamma p) becomes Q^2 independent at
large values of the coherence length l.
|
[
{
"created": "Wed, 6 Feb 2008 12:56:51 GMT",
"version": "v1"
}
] |
2008-02-07
|
[
[
"Caldwell",
"Allen",
""
]
] |
Various parametrizations of sigma(gamma p) are tried out on the small-x fixed target and HERA data. A two-Pomeron type parametrization is found to give the best reproduction of the data. The data indicate that the value of lambda(eff) for parametrizations of the form sigma(gamma p)~l^lambda(eff) approaches a constant value at high Q^2. The extrapolated values of sigma(gamma p) to very long coherence lengths are found to cross in some parametrizations for l>10^7 fm, indicating the possibility that sigma(gamma p) becomes Q^2 independent at large values of the coherence length l.
|
2104.07670
|
Samuel Witte
|
Samuel J. Witte, Dion Noordhuis, Thomas D. P. Edwards, and Christoph
Weniger
|
Axion-Photon Conversion in Neutron Star Magnetospheres: The Role of the
Plasma in the Goldreich-Julian Model
|
v3: Fix "?" citation. v2: Accepted for publication PRD. Convergence
improved, plots updated, minor bugs and typos corrected. No major changes to
results/conclusions. v1: 9 pages + Appendix
| null |
10.1103/PhysRevD.104.103030
| null |
hep-ph astro-ph.CO astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The most promising indirect search for the existence of axion dark matter
uses radio telescopes to look for narrow spectral lines generated from the
resonant conversion of axions in the magnetospheres of neutron stars.
Unfortunately, a large list of theoretical uncertainties has prevented this
search strategy from being fully accepted as robust. In this work we attempt to
address major outstanding questions related to the role and impact of the
plasma, including: $(i)$ does refraction and reflection of radio photons in the
magnetosphere induce strong inhomogeneities in the flux, $(ii)$ can refraction
induce premature axion-photon de-phasing, $(iii)$ to what extent do
photon-plasma interactions induce a broadening of the spectral line, $(iv)$
does the flux have a strong time dependence, and $(v)$ can radio photons
sourced by axions be absorbed by the plasma. We present an end-to-end analysis
pipeline based on ray-tracing that exploits a state-of-the-art
auto-differentiation algorithm to propagate photons from the conversion surface
to asymptotically large distances. Adopting a charge symmetric Goldreich-Julian
model for the magnetosphere, we show that for reasonable parameters one should
expect a strong anisotropy of the signal, refraction induced axion-photon
de-phasing, significant line-broadening, a variable time-dependence of the
flux, and, for large enough magnetic fields, anisotropic absorption. Our
simulation code is flexible enough to serve as the basis for follow-up studies
with a large range of magnetosphere models.
|
[
{
"created": "Thu, 15 Apr 2021 18:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Nov 2021 08:34:03 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Jul 2022 13:50:06 GMT",
"version": "v3"
}
] |
2022-07-05
|
[
[
"Witte",
"Samuel J.",
""
],
[
"Noordhuis",
"Dion",
""
],
[
"Edwards",
"Thomas D. P.",
""
],
[
"Weniger",
"Christoph",
""
]
] |
The most promising indirect search for the existence of axion dark matter uses radio telescopes to look for narrow spectral lines generated from the resonant conversion of axions in the magnetospheres of neutron stars. Unfortunately, a large list of theoretical uncertainties has prevented this search strategy from being fully accepted as robust. In this work we attempt to address major outstanding questions related to the role and impact of the plasma, including: $(i)$ does refraction and reflection of radio photons in the magnetosphere induce strong inhomogeneities in the flux, $(ii)$ can refraction induce premature axion-photon de-phasing, $(iii)$ to what extent do photon-plasma interactions induce a broadening of the spectral line, $(iv)$ does the flux have a strong time dependence, and $(v)$ can radio photons sourced by axions be absorbed by the plasma. We present an end-to-end analysis pipeline based on ray-tracing that exploits a state-of-the-art auto-differentiation algorithm to propagate photons from the conversion surface to asymptotically large distances. Adopting a charge symmetric Goldreich-Julian model for the magnetosphere, we show that for reasonable parameters one should expect a strong anisotropy of the signal, refraction induced axion-photon de-phasing, significant line-broadening, a variable time-dependence of the flux, and, for large enough magnetic fields, anisotropic absorption. Our simulation code is flexible enough to serve as the basis for follow-up studies with a large range of magnetosphere models.
|
hep-ph/9712340
|
Jonathan R. Ellis
|
John Ellis
|
Hunting Down Interpretations of the HERA Large-Q^2 data
|
8 pages, Latex, Parallel Session Talk presented at Europhysics
Conference on High-Energy Physics, Jerusalem, August 1997
| null | null |
CERN-TH/97-356
|
hep-ph
| null |
Possible interpretations of the HERA large-Q^2 data are reviewed briefly. The
possibility of statistical fluctuations cannot be ruled out, and it seems
premature to argue that the H1 and ZEUS anomalies are incompatible. The data
cannot be explained away by modifications of parton distributions, nor do
contact interactions help. A leptoquark interpretation would need a large tau-q
branching ratio. Several R-violating squark interpretations are still viable
despite all the constraints, and offer interesting experimental signatures, but
please do not hold your breath.
|
[
{
"created": "Thu, 11 Dec 1997 09:29:11 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Ellis",
"John",
""
]
] |
Possible interpretations of the HERA large-Q^2 data are reviewed briefly. The possibility of statistical fluctuations cannot be ruled out, and it seems premature to argue that the H1 and ZEUS anomalies are incompatible. The data cannot be explained away by modifications of parton distributions, nor do contact interactions help. A leptoquark interpretation would need a large tau-q branching ratio. Several R-violating squark interpretations are still viable despite all the constraints, and offer interesting experimental signatures, but please do not hold your breath.
|
1411.7392
|
Robert Schabinger
|
Andreas von Manteuffel, Erik Panzer, and Robert M. Schabinger
|
A quasi-finite basis for multi-loop Feynman integrals
|
21 pages, 3 figures; in v2: added additional references. v2 is the
version published in JHEP; in v3: fixed references
|
Journal of High Energy Physics, February 2015:120
|
10.1007/JHEP02(2015)120
|
MITP/14-076
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a new method for the decomposition of multi-loop Euclidean Feynman
integrals into quasi-finite Feynman integrals. These are defined in shifted
dimensions with higher powers of the propagators, make explicit both infrared
and ultraviolet divergences, and allow for an immediate and trivial expansion
in the parameter of dimensional regularization. Our approach avoids the
introduction of spurious structures and thereby leaves integrals particularly
accessible to direct analytical integration techniques. Alternatively, the
resulting convergent Feynman parameter integrals may be evaluated numerically.
Our approach is guided by previous work by the second author but overcomes
practical limitations of the original procedure by employing integration by
parts reduction.
|
[
{
"created": "Wed, 26 Nov 2014 21:00:52 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Sep 2015 14:18:18 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Apr 2017 14:49:58 GMT",
"version": "v3"
}
] |
2017-04-21
|
[
[
"von Manteuffel",
"Andreas",
""
],
[
"Panzer",
"Erik",
""
],
[
"Schabinger",
"Robert M.",
""
]
] |
We present a new method for the decomposition of multi-loop Euclidean Feynman integrals into quasi-finite Feynman integrals. These are defined in shifted dimensions with higher powers of the propagators, make explicit both infrared and ultraviolet divergences, and allow for an immediate and trivial expansion in the parameter of dimensional regularization. Our approach avoids the introduction of spurious structures and thereby leaves integrals particularly accessible to direct analytical integration techniques. Alternatively, the resulting convergent Feynman parameter integrals may be evaluated numerically. Our approach is guided by previous work by the second author but overcomes practical limitations of the original procedure by employing integration by parts reduction.
|
1111.4308
|
Andrej Arbuzov
|
Andrej B. Arbuzov and Tatiana V. Kopylova
|
On relativization of the Sommerfeld-Gamow-Sakharov factor
|
9 pages, 4 figures; references and discussion are extended
| null |
10.1007/JHEP04(2012)009
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Sommerfeld-Gamow-Sakharov factor is considered for the general case of
arbitrary masses and energies. It is shown that the scalar triangular one-loop
diagram gives the Coulomb singularity in radiative corrections at the
threshold. The singular part of the correction is factorized at the complete
Born cross section regardless of its partial wave decomposition. Different
approaches to generalize the factor are discussed.
|
[
{
"created": "Fri, 18 Nov 2011 09:18:09 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Nov 2011 10:18:24 GMT",
"version": "v2"
}
] |
2015-06-03
|
[
[
"Arbuzov",
"Andrej B.",
""
],
[
"Kopylova",
"Tatiana V.",
""
]
] |
The Sommerfeld-Gamow-Sakharov factor is considered for the general case of arbitrary masses and energies. It is shown that the scalar triangular one-loop diagram gives the Coulomb singularity in radiative corrections at the threshold. The singular part of the correction is factorized at the complete Born cross section regardless of its partial wave decomposition. Different approaches to generalize the factor are discussed.
|
1504.07008
|
Peter Filip
|
Peter Filip
|
Decay of Resonaces in Strong Magnetic Field
|
10 pages, 6 figures, contribution to WWND-2015 conference proceedings
|
Journal of Physics: Conference Series 636 (2015) 012013
|
10.1088/1742-6596/636/1/012013
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We suggest that decay properties (branching ratios) of hadronic resonances
may become modified in strong external magnetic field. The behavior of $K^{\pm
*}\!$, $K^{0*}$ vector mesons as well as $\Lambda^*(1520)$ and $\Xi^{0*}$
baryonic states is considered in static fields $10^{13}$-\,$10^{15}$ T. In
particular, $n=0$ Landau level energy increase of charged particles in the
external magnetic field, and the interaction of hadron magnetic moments with
the field is taken into account. We suggest that enhanced yield of dileptons
and photons from $\rho^0(770)$ mesons may occur if strong decay channel $\rho^0
\rightarrow \pi^+\pi^-$ is significantly suppressed. CP - violating
$\pi^+\pi^-$ decays of pseudoscalar $\eta_c$ and $\eta(547)$ mesons in the
magnetic field are discussed, and superpositions of quarkonium states
$\eta_{c,b}$ and $\chi_{c,b}(nP)$ with $\Psi(nS), \Upsilon(nS)$ mesons in the
external field are considered.
|
[
{
"created": "Mon, 27 Apr 2015 10:00:20 GMT",
"version": "v1"
}
] |
2015-09-01
|
[
[
"Filip",
"Peter",
""
]
] |
We suggest that decay properties (branching ratios) of hadronic resonances may become modified in strong external magnetic field. The behavior of $K^{\pm *}\!$, $K^{0*}$ vector mesons as well as $\Lambda^*(1520)$ and $\Xi^{0*}$ baryonic states is considered in static fields $10^{13}$-\,$10^{15}$ T. In particular, $n=0$ Landau level energy increase of charged particles in the external magnetic field, and the interaction of hadron magnetic moments with the field is taken into account. We suggest that enhanced yield of dileptons and photons from $\rho^0(770)$ mesons may occur if strong decay channel $\rho^0 \rightarrow \pi^+\pi^-$ is significantly suppressed. CP - violating $\pi^+\pi^-$ decays of pseudoscalar $\eta_c$ and $\eta(547)$ mesons in the magnetic field are discussed, and superpositions of quarkonium states $\eta_{c,b}$ and $\chi_{c,b}(nP)$ with $\Psi(nS), \Upsilon(nS)$ mesons in the external field are considered.
|
hep-ph/9802407
| null |
Marco Aurelio Diaz
|
Bilinear R-Parity Violation
|
12 pages, including 5 figures, Latex. To appear in the proceedings of
the International Workshop "Beyond the Standard Model: From Theory to
Experiment", 13-17 October 1997, Valencia, Spain
| null | null |
IFIC/98-11, FTUV/98-11
|
hep-ph
| null |
We review some of the main features of Bilinear R-Parity Violation (BRpV),
defined by a quadratic term in the superpotential which mixes lepton and Higgs
superfields and is proportional to a mass parameter epsilon. We show how large
values of epsilon can induce a small neutrino mass without fine-tunning. We
mention the effect on the mass of the lightest Higgs boson. Finally we report
on the effect of BRpV on gauge and Yukawa unification, showing that bottom-tau
unification can be achieved at any value of tan(beta).
|
[
{
"created": "Tue, 24 Feb 1998 13:20:44 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Diaz",
"Marco Aurelio",
""
]
] |
We review some of the main features of Bilinear R-Parity Violation (BRpV), defined by a quadratic term in the superpotential which mixes lepton and Higgs superfields and is proportional to a mass parameter epsilon. We show how large values of epsilon can induce a small neutrino mass without fine-tunning. We mention the effect on the mass of the lightest Higgs boson. Finally we report on the effect of BRpV on gauge and Yukawa unification, showing that bottom-tau unification can be achieved at any value of tan(beta).
|
1601.03566
|
Hyun Min Lee
|
Soo-Min Choi, Hyun Min Lee
|
Resonant SIMP dark matter
|
14 pages, 5 figures, Improved discussion on thermal-averaged
annihilation cross section
| null |
10.1016/j.physletb.2016.04.055
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a resonant SIMP dark matter in models with two singlet complex
scalar fields charged under a local dark $U(1)_D$. After the $U(1)_D$ is broken
down to a $Z_5$ discrete subgroup, the lighter scalar field becomes a SIMP dark
matter which has the enhanced $3\rightarrow 2$ annihilation cross section near
the resonance of the heavier scalar field. Bounds on the SIMP self-scattering
cross section and the relic density can be fulfilled at the same time for
perturbative couplings of SIMP. A small gauge kinetic mixing between the SM
hypercharge and dark gauge bosons can be used to make SIMP dark matter in
kinetic equilibrium with the SM during freeze-out.
|
[
{
"created": "Thu, 14 Jan 2016 11:50:20 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Mar 2016 14:45:50 GMT",
"version": "v2"
}
] |
2016-06-22
|
[
[
"Choi",
"Soo-Min",
""
],
[
"Lee",
"Hyun Min",
""
]
] |
We consider a resonant SIMP dark matter in models with two singlet complex scalar fields charged under a local dark $U(1)_D$. After the $U(1)_D$ is broken down to a $Z_5$ discrete subgroup, the lighter scalar field becomes a SIMP dark matter which has the enhanced $3\rightarrow 2$ annihilation cross section near the resonance of the heavier scalar field. Bounds on the SIMP self-scattering cross section and the relic density can be fulfilled at the same time for perturbative couplings of SIMP. A small gauge kinetic mixing between the SM hypercharge and dark gauge bosons can be used to make SIMP dark matter in kinetic equilibrium with the SM during freeze-out.
|
hep-ph/9709285
|
Anupam Singh
|
Edward W. Kolb, Anupam Singh and Mark Srednicki
|
Quantum Fluctuations of Axions
|
Revtex, 15 pages including epsf figures, final version to appear in
Phys. Rev. D: now contains a detailed discussion taking into account the time
dependence of the axion mass; conclusions unchanged
|
Phys.Rev. D58 (1998) 105004
|
10.1103/PhysRevD.58.105004
| null |
hep-ph astro-ph gr-qc hep-th
| null |
We study the time evolution of the quantum fluctuations of the axion field
for both the QCD axion as well as axions arising in the context of supergravity
and string theories. We explicitly keep track not only of the coherently
oscillating zero momentum mode of the axion but also of the higher non-zero
momentum modes using the full axion potential. The full axion potential makes
possible two kinds of instabilities: spinodal instabilities and parametric
resonance instabilities. The presence of either of these instabilities can lead
to a quasi-exponential increase in the occupation of non-zero momentum modes
and the build-up of the quantum fluctuations of the axions. If either of these
becomes a significant effect then axions would no longer be a suitable cold
dark matter candidate. Our results confirm the conventional wisdom that these
effects are not significant in the setting of an expanding FRW universe and
hence axions are indeed cold dark matter candidates.
|
[
{
"created": "Mon, 8 Sep 1997 18:28:23 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Jul 1998 21:21:30 GMT",
"version": "v2"
}
] |
2009-10-30
|
[
[
"Kolb",
"Edward W.",
""
],
[
"Singh",
"Anupam",
""
],
[
"Srednicki",
"Mark",
""
]
] |
We study the time evolution of the quantum fluctuations of the axion field for both the QCD axion as well as axions arising in the context of supergravity and string theories. We explicitly keep track not only of the coherently oscillating zero momentum mode of the axion but also of the higher non-zero momentum modes using the full axion potential. The full axion potential makes possible two kinds of instabilities: spinodal instabilities and parametric resonance instabilities. The presence of either of these instabilities can lead to a quasi-exponential increase in the occupation of non-zero momentum modes and the build-up of the quantum fluctuations of the axions. If either of these becomes a significant effect then axions would no longer be a suitable cold dark matter candidate. Our results confirm the conventional wisdom that these effects are not significant in the setting of an expanding FRW universe and hence axions are indeed cold dark matter candidates.
|
1104.0083
|
Jing Shu
|
Jing Shu, Kai Wang and Guohuai Zhu
|
A Revisit to Top Quark Forward-Backward Asymmetry
|
25 pages, 7 figures, 1 table
| null |
10.1103/PhysRevD.85.034008
|
IPMU11-0050
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze various models for the top quark forward-backward asymmetry
($A^t_{FB}$) at the Tevatron, using the latest CDF measurements on different
$A^t_{FB}$s and the total cross section. The axigluon model in Ref. \cite{paul}
has difficulties in explaining the large rapidity dependent asymmetry and mass
dependent asymmetry simultaneously and the parameter space relevant to
$A^t_{FB}$ is ruled out by the latest dijet search at ATLAS. In contrast to
Ref. \cite{cp}, we demonstrate that the large parameter space in this model
with a $U(1)_d$ flavor symemtry is not ruled out by flavor physics. The
$t$-channel flavor-violating $Z^{\prime}$ \cite{hitoshi},
$W^{\prime}$\cite{waiyee} and diquark \cite{tim} models all have parameter
regions that satisfy different $A_{FB}$ measurements within 1 $\sigma$.
However, the heavy $Z^{\prime}$ model which can be marginally consistent with
the total cross section is severely constrained by the Tevatron direct search
of same-sign top quark pair. The diquark model suffers from too large total
cross section and is difficult to fit the $t \bar{t}$ invariant mass
distribution. The electroweak precision constraints on the $W'$ model based on
$Z'$-$Z$ mixings is estimated and the result is rather weak ($m_{Z'} > 450$
GeV). Therefore, the heavy $W^{\prime}$ model seems to give the best fit for
all the measurements. The $W^{\prime}$ model predicts the $t\bar{t}+j$ signal
from $tW^{\prime}$ production and is 10%-50% of SM $t\bar{t}$ at the 7 TeV LHC.
Such $t+j$ resonance can serve as the direct test of the $W^{\prime}$ model.
|
[
{
"created": "Fri, 1 Apr 2011 06:02:13 GMT",
"version": "v1"
}
] |
2015-05-27
|
[
[
"Shu",
"Jing",
""
],
[
"Wang",
"Kai",
""
],
[
"Zhu",
"Guohuai",
""
]
] |
We analyze various models for the top quark forward-backward asymmetry ($A^t_{FB}$) at the Tevatron, using the latest CDF measurements on different $A^t_{FB}$s and the total cross section. The axigluon model in Ref. \cite{paul} has difficulties in explaining the large rapidity dependent asymmetry and mass dependent asymmetry simultaneously and the parameter space relevant to $A^t_{FB}$ is ruled out by the latest dijet search at ATLAS. In contrast to Ref. \cite{cp}, we demonstrate that the large parameter space in this model with a $U(1)_d$ flavor symemtry is not ruled out by flavor physics. The $t$-channel flavor-violating $Z^{\prime}$ \cite{hitoshi}, $W^{\prime}$\cite{waiyee} and diquark \cite{tim} models all have parameter regions that satisfy different $A_{FB}$ measurements within 1 $\sigma$. However, the heavy $Z^{\prime}$ model which can be marginally consistent with the total cross section is severely constrained by the Tevatron direct search of same-sign top quark pair. The diquark model suffers from too large total cross section and is difficult to fit the $t \bar{t}$ invariant mass distribution. The electroweak precision constraints on the $W'$ model based on $Z'$-$Z$ mixings is estimated and the result is rather weak ($m_{Z'} > 450$ GeV). Therefore, the heavy $W^{\prime}$ model seems to give the best fit for all the measurements. The $W^{\prime}$ model predicts the $t\bar{t}+j$ signal from $tW^{\prime}$ production and is 10%-50% of SM $t\bar{t}$ at the 7 TeV LHC. Such $t+j$ resonance can serve as the direct test of the $W^{\prime}$ model.
|
hep-ph/0203060
|
yongjin Jiang
|
Guang-jiong Ni
|
Superluminal Paradox and Neutrino
| null | null | null | null |
hep-ph
| null |
Einstein's theory of special relativity(SR) and the principle of causality
imply that the speed of any moving object can not exceed that of light in a
vacuum($c$).However,there were many attempts in literature discussing the
particle moving with speed $u>c$(called as superluminal particle or
tachyon)either in the scheme of SR or beyond it.These theories all encountered
a series of insurmountable difficulties which will be named ``superluminal
paradox''in this paper.We will analyze it in some detail and then prove that
the paradox disappears unambiguously in quantum theory,which is compatible with
SR.Most likely,the superluminal particle in real world is just a kind of known
particle,the neutrino.
|
[
{
"created": "Wed, 6 Mar 2002 08:27:34 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Ni",
"Guang-jiong",
""
]
] |
Einstein's theory of special relativity(SR) and the principle of causality imply that the speed of any moving object can not exceed that of light in a vacuum($c$).However,there were many attempts in literature discussing the particle moving with speed $u>c$(called as superluminal particle or tachyon)either in the scheme of SR or beyond it.These theories all encountered a series of insurmountable difficulties which will be named ``superluminal paradox''in this paper.We will analyze it in some detail and then prove that the paradox disappears unambiguously in quantum theory,which is compatible with SR.Most likely,the superluminal particle in real world is just a kind of known particle,the neutrino.
|
1708.07348
|
Kazem Azizi
|
S. S. Agaev, K. Azizi, H. Sundu
|
Decay widths of the excited $\Omega_b$ baryons
|
17 Pages, 8 Figures and 1 Table
| null |
10.1103/PhysRevD.96.094011
| null |
hep-ph hep-ex hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The LHCb Collaboration recently observed five narrow $\Omega_c^{0}$
resonances, and measured their masses and widths through the decays $
\Omega_c^{0} \to \Xi_c^{+}K^{-}$. Motivated by this discovery, and also by the
fact that the ground-state bottom baryon $\Omega_b^{-}$ with spin-1/2 was
already found experimentally, we perform theoretical investigation of the
spin-1/2 and spin-3/2, $\Omega_b$, baryons by calculating decay width of their
first orbitally and radially excited states to $\Xi_b^{0} K^{-}$. For this
purpose, we employ QCD sum rule method on the light-cone by including into
analysis the $K$ meson distribution amplitudes up to twist-4. Obtained
analytical expressions are utilized to extract parameters of these decay
processes which may be useful for forthcoming experimental studies of bottom
baryons.
|
[
{
"created": "Thu, 24 Aug 2017 10:43:11 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Oct 2017 14:24:41 GMT",
"version": "v2"
}
] |
2022-08-17
|
[
[
"Agaev",
"S. S.",
""
],
[
"Azizi",
"K.",
""
],
[
"Sundu",
"H.",
""
]
] |
The LHCb Collaboration recently observed five narrow $\Omega_c^{0}$ resonances, and measured their masses and widths through the decays $ \Omega_c^{0} \to \Xi_c^{+}K^{-}$. Motivated by this discovery, and also by the fact that the ground-state bottom baryon $\Omega_b^{-}$ with spin-1/2 was already found experimentally, we perform theoretical investigation of the spin-1/2 and spin-3/2, $\Omega_b$, baryons by calculating decay width of their first orbitally and radially excited states to $\Xi_b^{0} K^{-}$. For this purpose, we employ QCD sum rule method on the light-cone by including into analysis the $K$ meson distribution amplitudes up to twist-4. Obtained analytical expressions are utilized to extract parameters of these decay processes which may be useful for forthcoming experimental studies of bottom baryons.
|
1810.07955
|
Nicolas Wink
|
Reinhard Alkofer, Axel Maas, Walid Ahmed Mian, Mario Mitter, Jordi
Par\'is-L\'opez, Jan M. Pawlowski, Nicolas Wink
|
Bound state properties from the Functional Renormalisation Group
|
Version submitted to Journal
|
Phys. Rev. D 99, 054029 (2019)
|
10.1103/PhysRevD.99.054029
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss an approach for accessing bound state properties, like mass and
decay width, of a theory within the functional renormalisation group approach.
An important cornerstone is the dynamical hadronization technique for resonant
interaction channels. The general framework is exemplified and put to work
within the two-flavour quark-meson model. This model provides a low-energy
description of the dynamics of two-flavour QCD with quark and hadronic degrees
of freedom. We compare explicitly the respective results for correlation
functions and observables with first principle QCD results in a quantitative
manner. This allows us to estimate the validity range of low energy effective
models. We also present first results for pole masses and decay widths. Next
steps involving real-time formulations of the functional renormalisation group
are discussed.
|
[
{
"created": "Thu, 18 Oct 2018 09:06:49 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Nov 2018 14:36:37 GMT",
"version": "v2"
}
] |
2019-04-03
|
[
[
"Alkofer",
"Reinhard",
""
],
[
"Maas",
"Axel",
""
],
[
"Mian",
"Walid Ahmed",
""
],
[
"Mitter",
"Mario",
""
],
[
"París-López",
"Jordi",
""
],
[
"Pawlowski",
"Jan M.",
""
],
[
"Wink",
"Nicolas",
""
]
] |
We discuss an approach for accessing bound state properties, like mass and decay width, of a theory within the functional renormalisation group approach. An important cornerstone is the dynamical hadronization technique for resonant interaction channels. The general framework is exemplified and put to work within the two-flavour quark-meson model. This model provides a low-energy description of the dynamics of two-flavour QCD with quark and hadronic degrees of freedom. We compare explicitly the respective results for correlation functions and observables with first principle QCD results in a quantitative manner. This allows us to estimate the validity range of low energy effective models. We also present first results for pole masses and decay widths. Next steps involving real-time formulations of the functional renormalisation group are discussed.
|
hep-ph/0311182
|
Nestor Armesto
|
N. Armesto
|
Introduction to Low x Physics and Saturation
|
8 pages in LaTeX using enclosed appolb.cls, 3 eps figures included
using epsfig; minireview at the XXXIIIrd International Symposium on
Multiparticle Dynamics (Kracow, Poland, September 5th-11th 2003)
|
Acta Phys.Polon. B35 (2004) 213-222
| null |
CERN-TH/2003-278
|
hep-ph
| null |
The idea of saturation of parton densities in small x physics is briefly
introduced. Some aspects of saturation are described, mainly focusing on the
status of our knowledge on the non-linear equations describing the high parton
density regime. Implications of saturation ideas on the description of nuclear
collisions at the Relativistic Heavy Ion Collider are discussed.
|
[
{
"created": "Fri, 14 Nov 2003 09:31:26 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Armesto",
"N.",
""
]
] |
The idea of saturation of parton densities in small x physics is briefly introduced. Some aspects of saturation are described, mainly focusing on the status of our knowledge on the non-linear equations describing the high parton density regime. Implications of saturation ideas on the description of nuclear collisions at the Relativistic Heavy Ion Collider are discussed.
|
1109.0661
|
Gilberto Tavares-Velasco
|
I. Cortes-Maldonado (Facultad de Ciencias Fisico Matematicas,
Benemerita Universidad Autonoma de Puebla), A. Moyotl (Instituto de Fisica,
Benemerita Universidad Autonoma de Puebla), G. Tavares-Velasco (Facultad de
Ciencias Fisico Matematicas, Benemerita Universidad Autonoma de Puebla)
|
Lepton flavor violating decay Z-> l_i l_j in the 331 model
|
14 pages, 3 figures, 1 table
| null |
10.1142/S0217751X11054474
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the lepton flavor violating (LFV) decays Z-> l_i l_j
(l_{i,j}=e,\mu,\tau) in the framework of the minimal 331 model. The main
contributions arise at the one-loop level via a doubly charged bilepton with
general LFV couplings. We obtain an estimate for the corresponding branching
ratios by using the bounds on the LFV couplings of the doubly charged bilepton
from the current experimental limits on the decays l_i-> l_j\gamma and l_i->
l_j l_k l_k. A bound on the bilepton mass is also obtained through the current
limit on the anomalous magnetic moment of the muon. It is found that the
bilepton contributions to LFV Z decays are not expected to be at the reach of
experimental detection. In particular, the branching ratio for the Z-> \mu \tau
decay is below the 10^{-10} level for a bilepton mass of the order of 500 GeV.
|
[
{
"created": "Sun, 4 Sep 2011 01:06:58 GMT",
"version": "v1"
}
] |
2011-09-29
|
[
[
"Cortes-Maldonado",
"I.",
"",
"Facultad de Ciencias Fisico Matematicas,\n Benemerita Universidad Autonoma de Puebla"
],
[
"Moyotl",
"A.",
"",
"Instituto de Fisica,\n Benemerita Universidad Autonoma de Puebla"
],
[
"Tavares-Velasco",
"G.",
"",
"Facultad de\n Ciencias Fisico Matematicas, Benemerita Universidad Autonoma de Puebla"
]
] |
We study the lepton flavor violating (LFV) decays Z-> l_i l_j (l_{i,j}=e,\mu,\tau) in the framework of the minimal 331 model. The main contributions arise at the one-loop level via a doubly charged bilepton with general LFV couplings. We obtain an estimate for the corresponding branching ratios by using the bounds on the LFV couplings of the doubly charged bilepton from the current experimental limits on the decays l_i-> l_j\gamma and l_i-> l_j l_k l_k. A bound on the bilepton mass is also obtained through the current limit on the anomalous magnetic moment of the muon. It is found that the bilepton contributions to LFV Z decays are not expected to be at the reach of experimental detection. In particular, the branching ratio for the Z-> \mu \tau decay is below the 10^{-10} level for a bilepton mass of the order of 500 GeV.
|
0912.2660
|
Jacopo Bechi
|
Jacopo Bechi
|
Statistical Hadronization and Holography
| null | null | null |
CP3-Origins: 2009-27
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we consider some issues about the statistical model of the
hadronization in a holographic approach. We introduce a Rindler like horizon in
the bulk and we understand the string breaking as a tunneling event under this
horizon. We calculate the hadron spectrum and we get a thermal, and so
statistical, shape for it.
|
[
{
"created": "Mon, 14 Dec 2009 15:14:51 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Dec 2009 14:37:23 GMT",
"version": "v2"
}
] |
2009-12-17
|
[
[
"Bechi",
"Jacopo",
""
]
] |
In this paper we consider some issues about the statistical model of the hadronization in a holographic approach. We introduce a Rindler like horizon in the bulk and we understand the string breaking as a tunneling event under this horizon. We calculate the hadron spectrum and we get a thermal, and so statistical, shape for it.
|
0906.4231
|
Hannu Paukkunen
|
Kari J. Eskola, Hannu Paukkunen, Carlos A. Salgado
|
EPS09 - Nuclear PDFs and Their Uncertainties at NLO
|
4 pages, 4 figures - To appear in the conference proceedings for
Quark Matter 2009, March 30 - April 4, Knoxville, Tennessee
|
Nucl.Phys.A830:599c-602c,2009
|
10.1016/j.nuclphysa.2009.10.054
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this talk, we present our recent next-to-leading order (NLO) nuclear
parton distribution functions (nPDFs), which we call EPS09. As an extension to
earlier NLO analyses, we supplement the deep inelastic scattering and Drell-Yan
dilepton data by inclusive midrapidity pion measurements from RHIC in order to
reduce the otherwize large freedom in the nuclear gluon densities. Our
Hessian-type error analysis leading to a collection of nPDF error sets, is the
first of its kind among the nPDF analyses.
|
[
{
"created": "Tue, 23 Jun 2009 11:41:18 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Sep 2009 08:23:58 GMT",
"version": "v2"
}
] |
2009-11-18
|
[
[
"Eskola",
"Kari J.",
""
],
[
"Paukkunen",
"Hannu",
""
],
[
"Salgado",
"Carlos A.",
""
]
] |
In this talk, we present our recent next-to-leading order (NLO) nuclear parton distribution functions (nPDFs), which we call EPS09. As an extension to earlier NLO analyses, we supplement the deep inelastic scattering and Drell-Yan dilepton data by inclusive midrapidity pion measurements from RHIC in order to reduce the otherwize large freedom in the nuclear gluon densities. Our Hessian-type error analysis leading to a collection of nPDF error sets, is the first of its kind among the nPDF analyses.
|
0803.2664
|
Florian Bauer
|
Florian Bauer and Durmus A. Demir
|
Inflation with Non-Minimal Coupling: Metric vs. Palatini Formulations
|
13 pages, reference added
|
Phys.Lett.B665:222-226,2008
|
10.1016/j.physletb.2008.06.014
|
DESY 08-033, IZTECH-P-08/02
|
hep-ph astro-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze non-minimally coupled scalar field theories in metric
(second-order) and Palatini (first-order) formalisms in a comparative fashion.
After contrasting them in a general setup, we specialize to inflation and find
that the two formalisms differ in their predictions for various cosmological
parameters. The main reason is that dependencies on the non-minimal coupling
parameter are different in the two formalisms. For successful inflation, the
Palatini approach prefers a much larger value for the non-minimal coupling
parameter than the Metric approach. Unlike the Metric formalism, in Palatini,
the inflaton stays well below the Planck scale whereby providing a natural
inflationary epoch.
|
[
{
"created": "Tue, 18 Mar 2008 15:55:28 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Jun 2008 07:30:05 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Bauer",
"Florian",
""
],
[
"Demir",
"Durmus A.",
""
]
] |
We analyze non-minimally coupled scalar field theories in metric (second-order) and Palatini (first-order) formalisms in a comparative fashion. After contrasting them in a general setup, we specialize to inflation and find that the two formalisms differ in their predictions for various cosmological parameters. The main reason is that dependencies on the non-minimal coupling parameter are different in the two formalisms. For successful inflation, the Palatini approach prefers a much larger value for the non-minimal coupling parameter than the Metric approach. Unlike the Metric formalism, in Palatini, the inflaton stays well below the Planck scale whereby providing a natural inflationary epoch.
|
0811.0485
|
Carlos E. Yaguna
|
Carlos E. Yaguna
|
Inverse decays and the relic density of the sterile sneutrino
|
15 pages, 4 figures
|
Phys.Lett.B669:139-144,2008
|
10.1016/j.physletb.2008.09.048
|
IFT-UAM/CSIC-08-72
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a weak scale supersymmetric seesaw model where the Higgsino is
the next-to-lightest supersymmetric particle and the right-handed sneutrino is
the dark matter candidate. It is shown that, in this model, inverse decays,
which had been previously neglected, may suppress the sneutrino relic density
by several orders of magnitude. After including such processes and numerically
solving the appropriate Boltzmann equation, we study the dependence of the
relic density on the mu parameter, the sneutrino mass, and the neutrino Yukawa
coupling. We find that, even though much smaller than in earlier calculations,
the sneutrino relic density is still larger than the observed dark matter
density.
|
[
{
"created": "Tue, 4 Nov 2008 11:58:27 GMT",
"version": "v1"
}
] |
2011-01-25
|
[
[
"Yaguna",
"Carlos E.",
""
]
] |
We consider a weak scale supersymmetric seesaw model where the Higgsino is the next-to-lightest supersymmetric particle and the right-handed sneutrino is the dark matter candidate. It is shown that, in this model, inverse decays, which had been previously neglected, may suppress the sneutrino relic density by several orders of magnitude. After including such processes and numerically solving the appropriate Boltzmann equation, we study the dependence of the relic density on the mu parameter, the sneutrino mass, and the neutrino Yukawa coupling. We find that, even though much smaller than in earlier calculations, the sneutrino relic density is still larger than the observed dark matter density.
|
1001.2887
|
Alexander Smirnov
|
R.N. Lee, A.V. Smirnov, V.A. Smirnov
|
Analytic Results for Massless Three-Loop Form Factors
|
minor revisions, to appear in JHEP
|
JHEP 1004:020,2010
|
10.1007/JHEP04(2010)020
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We evaluate, exactly in d, the master integrals contributing to massless
three-loop QCD form factors. The calculation is based on a combination of a
method recently suggested by one of the authors (R.L.) with other techniques:
sector decomposition implemented in FIESTA, the method of Mellin--Barnes
representation, and the PSLQ algorithm. Using our results for the master
integrals we obtain analytical expressions for two missing constants in the
ep-expansion of the two most complicated master integrals and present the form
factors in a completely analytic form.
|
[
{
"created": "Sun, 17 Jan 2010 11:00:10 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Mar 2010 10:37:44 GMT",
"version": "v2"
}
] |
2015-03-13
|
[
[
"Lee",
"R. N.",
""
],
[
"Smirnov",
"A. V.",
""
],
[
"Smirnov",
"V. A.",
""
]
] |
We evaluate, exactly in d, the master integrals contributing to massless three-loop QCD form factors. The calculation is based on a combination of a method recently suggested by one of the authors (R.L.) with other techniques: sector decomposition implemented in FIESTA, the method of Mellin--Barnes representation, and the PSLQ algorithm. Using our results for the master integrals we obtain analytical expressions for two missing constants in the ep-expansion of the two most complicated master integrals and present the form factors in a completely analytic form.
|
1009.1998
|
Sacha Davidson
|
Sacha Davidson and Sebastien Descotes-Genon
|
Minimal Flavour Violation for Leptoquarks
|
17 pages, 2 figures, minor changes and references added
|
JHEP 1011:073,2010
|
10.1007/JHEP11(2010)073
|
LPT-ORSAY/10-72
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Scalar leptoquarks, with baryon and lepton number conserving interactions,
could have TeV scale masses, and be produced at colliders or contribute to a
wide variety of rare decays. In pursuit of some insight as to the most
sensitive search channels, We assume that the leptoquark-lepton-quark coupling
can be constructed from the known mass matrices. We estimate the rates for
selected rare processes in three cases: leptoquarks carrying lepton and quark
flavour, leptoquarks with quark flavour only, and unflavoured leptoquarks. We
find that leptoquark decay to top quarks is an interesting search channel.
|
[
{
"created": "Fri, 10 Sep 2010 12:43:49 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Sep 2010 10:25:44 GMT",
"version": "v2"
}
] |
2011-03-17
|
[
[
"Davidson",
"Sacha",
""
],
[
"Descotes-Genon",
"Sebastien",
""
]
] |
Scalar leptoquarks, with baryon and lepton number conserving interactions, could have TeV scale masses, and be produced at colliders or contribute to a wide variety of rare decays. In pursuit of some insight as to the most sensitive search channels, We assume that the leptoquark-lepton-quark coupling can be constructed from the known mass matrices. We estimate the rates for selected rare processes in three cases: leptoquarks carrying lepton and quark flavour, leptoquarks with quark flavour only, and unflavoured leptoquarks. We find that leptoquark decay to top quarks is an interesting search channel.
|
hep-ph/9406240
|
Frans Klinkhamer
|
F. R. Klinkhamer
|
Another Look at the Electroweak Vortex Solution
|
Latex, 6 pages, preprint NIKHEF-H / 94-19
| null | null | null |
hep-ph
| null |
We discuss the position in configuration space of the electroweak vortex
solution. (Talk given at the NATO Advanced Research Workshop "Electroweak
Physics and the Early Universe", Sintra, Portugal, March 1994)
|
[
{
"created": "Tue, 7 Jun 1994 11:29:11 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Klinkhamer",
"F. R.",
""
]
] |
We discuss the position in configuration space of the electroweak vortex solution. (Talk given at the NATO Advanced Research Workshop "Electroweak Physics and the Early Universe", Sintra, Portugal, March 1994)
|
0710.1696
|
S. Descotes-Genon
|
S. Descotes-Genon (Orsay, LPT)
|
pi-pi and pi-K scatterings in three-flavour resummed chiral perturbation
theory
|
Proceedings of the EPS-HEP 2007 Conference, Manchester (UK). 3 pages,
1 figure
|
J.Phys.Conf.Ser.110:052012,2008
|
10.1088/1742-6596/110/5/052012
|
LPT-ORSAY 07-78
|
hep-ph
| null |
The (light but not-so-light) strange quark may play a special role in the
low-energy dynamics of QCD. The presence of strange quark pairs in the sea may
have a significant impact of the pattern of chiral symmetry breaking : in
particular large differences can occur between the chiral limits of two and
three massless flavours (i.e., whether m_s is kept at its physical value or
sent to zero). This may induce problems of convergence in three-flavour chiral
expansions. To cope with such difficulties, we introduce a new framework,
called Resummed Chiral Perturbation Theory. We exploit it to analyse pi-pi and
pi-K scatterings and match them with dispersive results in a frequentist
framework. Constraints on three-flavour chiral order parameters are derived.
|
[
{
"created": "Tue, 9 Oct 2007 08:27:11 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Descotes-Genon",
"S.",
"",
"Orsay, LPT"
]
] |
The (light but not-so-light) strange quark may play a special role in the low-energy dynamics of QCD. The presence of strange quark pairs in the sea may have a significant impact of the pattern of chiral symmetry breaking : in particular large differences can occur between the chiral limits of two and three massless flavours (i.e., whether m_s is kept at its physical value or sent to zero). This may induce problems of convergence in three-flavour chiral expansions. To cope with such difficulties, we introduce a new framework, called Resummed Chiral Perturbation Theory. We exploit it to analyse pi-pi and pi-K scatterings and match them with dispersive results in a frequentist framework. Constraints on three-flavour chiral order parameters are derived.
|
2402.19221
|
Hua-Sheng Shao
|
Ajjath A H, Hua-Sheng Shao, and Lukas Simon
|
FKS subtraction for quarkonium production at NLO
|
53 pages, 2 figures, v2 (journal version)
|
JHEP 07 (2024) 050
|
10.1007/JHEP07(2024)050
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We extend the local infrared-divergence subtraction formalism, originally
proposed by Frixione, Kunszt and Signer (FKS), to calculate short-distance
(differential) cross section for any inclusive process involving a quarkonium
particle in non-relativistic QCD (NRQCD) factorisation at next-to-leading order
(NLO) accuracy in the strong coupling constant $\alpha_s$. The new formulas are
generally applicable to the production of an S- or P-wave quarkonium state in
association with any number of elementary particles. The main new ingredients
derived in this paper are the local and integrated soft counterterms for the
colour-singlet and colour-octet P-wave bound states. It, therefore, paves the
way to the automation of the NLO calculations for heavy quarkonium inclusive
and associated production processes.
|
[
{
"created": "Thu, 29 Feb 2024 14:53:46 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Jul 2024 10:55:37 GMT",
"version": "v2"
}
] |
2024-07-09
|
[
[
"H",
"Ajjath A",
""
],
[
"Shao",
"Hua-Sheng",
""
],
[
"Simon",
"Lukas",
""
]
] |
We extend the local infrared-divergence subtraction formalism, originally proposed by Frixione, Kunszt and Signer (FKS), to calculate short-distance (differential) cross section for any inclusive process involving a quarkonium particle in non-relativistic QCD (NRQCD) factorisation at next-to-leading order (NLO) accuracy in the strong coupling constant $\alpha_s$. The new formulas are generally applicable to the production of an S- or P-wave quarkonium state in association with any number of elementary particles. The main new ingredients derived in this paper are the local and integrated soft counterterms for the colour-singlet and colour-octet P-wave bound states. It, therefore, paves the way to the automation of the NLO calculations for heavy quarkonium inclusive and associated production processes.
|
1609.03830
|
Samuel Wallon
|
R. Boussarie, B. Pire, L. Szymanowski, S. Wallon
|
Exclusive photoproduction of a $\gamma\,\rho$ pair with a large
invariant mass
|
published version; 54 pages, 23 figures. The cross section for the
exclusive photoproduction of a $\gamma\,\rho$ pair, in the case where the
final $\rho$-meson is longitudinally polarized, has been corrected
| null |
10.1007/JHEP02(2017)054
|
CPHT-RR038.072016, LPT-Orsay-16-58
|
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Exclusive photoproduction of a $\gamma\,\rho$ pair in the kinematics where
the pair has a large invariant mass and the final nucleon has a small
transverse momentum is described in the collinear factorization framework. The
scattering amplitude is calculated at leading order in $\alpha_s$ and the
differential cross sections for the process where the $\rho-$meson is either
longitudinally or transversely polarized are estimated in the kinematics of the
JLab 12-GeV experiments.
|
[
{
"created": "Tue, 13 Sep 2016 13:48:21 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Feb 2017 09:42:22 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Sep 2018 15:40:38 GMT",
"version": "v3"
}
] |
2018-09-05
|
[
[
"Boussarie",
"R.",
""
],
[
"Pire",
"B.",
""
],
[
"Szymanowski",
"L.",
""
],
[
"Wallon",
"S.",
""
]
] |
Exclusive photoproduction of a $\gamma\,\rho$ pair in the kinematics where the pair has a large invariant mass and the final nucleon has a small transverse momentum is described in the collinear factorization framework. The scattering amplitude is calculated at leading order in $\alpha_s$ and the differential cross sections for the process where the $\rho-$meson is either longitudinally or transversely polarized are estimated in the kinematics of the JLab 12-GeV experiments.
|
hep-ph/0610299
|
Urs M. Heller
|
Urs M. Heller
|
2+1 flavor simulations of QCD with improved staggered quarks
|
To appear in the proceedings of QNP06, IVth International Conference
on Quarks and Nuclear Physics, Madrid, June 2006
|
Eur.Phys.J.A31:769-772,2007
|
10.1140/epja/i2006-10222-6
| null |
hep-ph hep-lat
| null |
The MILC collaboration has been performing realistic simulations of full QCD
with 2+1 flavors of improved staggered quarks. Our simulations allow for
controlled continuum and chiral extrapolations. I present results for the light
pseudoscalar sector: masses and decay constants, quark masses and
Gasser-Leutwyler low-energy constants. In addition I will present some results
for heavy-light mesons, decay constants and semileptonic form factors, obtained
in collaboration with the HPQCD and Fermilab lattice collaborations. Such
calculations will help in the extraction of CKM matrix elements from
experimental measurements.
|
[
{
"created": "Mon, 23 Oct 2006 18:56:49 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Heller",
"Urs M.",
""
]
] |
The MILC collaboration has been performing realistic simulations of full QCD with 2+1 flavors of improved staggered quarks. Our simulations allow for controlled continuum and chiral extrapolations. I present results for the light pseudoscalar sector: masses and decay constants, quark masses and Gasser-Leutwyler low-energy constants. In addition I will present some results for heavy-light mesons, decay constants and semileptonic form factors, obtained in collaboration with the HPQCD and Fermilab lattice collaborations. Such calculations will help in the extraction of CKM matrix elements from experimental measurements.
|
hep-ph/0310150
|
Philip G. Ratcliffe
|
Philip G. Ratcliffe
|
QCD and Transverse-Spin Physics
|
Talk at the International Workshop on QCD: QCD@Work 2003 - Conversano
(Italy) 14-18 June 2003 (eConf C030614). LaTeX2e; 8 pages; uses standard
LaTeX macros (including psfrag), conference class file wqcd03.cls, and some
personal macros (included). Figures are eps and feynmp generated (included in
subfolders)
| null | null | null |
hep-ph
| null |
A pedagogical presentation of single-spin asymmetries and transversity is
offered. Detailed discussion is given of various aspects of single-spin
asymmetries in lepton-nucleon and in hadron-hadron scattering and of the role
of perturbative QCD and evolution in the context of transversity.
|
[
{
"created": "Mon, 13 Oct 2003 16:22:09 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Ratcliffe",
"Philip G.",
""
]
] |
A pedagogical presentation of single-spin asymmetries and transversity is offered. Detailed discussion is given of various aspects of single-spin asymmetries in lepton-nucleon and in hadron-hadron scattering and of the role of perturbative QCD and evolution in the context of transversity.
|
hep-ph/0005188
|
Francesco Terranova
|
Francesco Terranova
|
The impact of LEP 2 data on possible anomalous enhancements of Re e'/e
|
9 pages, 3 figures
|
Phys.Lett. B500 (2001) 113-117
|
10.1016/S0370-2693(01)00063-6
| null |
hep-ph
| null |
It has been shown in the past that the real part of the e'/e ratio is
particularly sensitive to anomalous gauge couplings that modify the Standard
Model Lagrangian. Due to the loose bounds on these couplings coming from low
energy processes and to the poor sensitivity of hadron colliders to couplings
such as $\Delta g_Z$, it has been argued that anomalous couplings could still
produce an enhancement of Re e'/e bringing this observable closer to the
experimental value obtained by KTeV, NA31 and NA48. The impact of the new
measurements done at LEP2 in these years is discussed and new severe
constraints to this hypothesis are determined.
|
[
{
"created": "Thu, 18 May 2000 14:23:50 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Terranova",
"Francesco",
""
]
] |
It has been shown in the past that the real part of the e'/e ratio is particularly sensitive to anomalous gauge couplings that modify the Standard Model Lagrangian. Due to the loose bounds on these couplings coming from low energy processes and to the poor sensitivity of hadron colliders to couplings such as $\Delta g_Z$, it has been argued that anomalous couplings could still produce an enhancement of Re e'/e bringing this observable closer to the experimental value obtained by KTeV, NA31 and NA48. The impact of the new measurements done at LEP2 in these years is discussed and new severe constraints to this hypothesis are determined.
|
1206.5375
|
Patrick K. S. Vaudrevange
|
Mu-Chun Chen, Michael Ratz, Christian Staudt, Patrick K. S.
Vaudrevange
|
The mu term and neutrino masses
|
24 pages
| null |
10.1016/j.nuclphysb.2012.08.018
|
UCI-TR-2012-08; TUM-HEP 845/12; DESY-12-108
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The well-known Giudice-Masiero mechanism explains the presence of a mu term
of the order of the gravitino mass, but does not explain why the holomorphic
mass term is absent in the superpotential. We discuss anomaly-free discrete
symmetries which are both compatible with SU(5) unification of matter and the
Giudice-Masiero mechanism, i.e. forbid the mu term in the superpotential while
allowing the necessary Kaehler potential term. We find that these are Z_M^R
symmetries with the following properties: (i) M is a multiple of four; (ii) the
Higgs bilinear H_u H_d transforms trivially; (iii) the superspace coordinate
theta has charge M/4 and, accordingly, the superpotential has charge M/2; (iv)
dimension five proton decay operators are automatically absent. All Z_M^R
symmetries are anomaly-free due to a non-trivial transformation of a
Green-Schwarz axion, and, as a consequence, a holomorphic mu term appears at
the non-perturbative level. There is a unique symmetry that is consistent with
the Weinberg operator while there is a class of Z_M^R symmetries which explain
suppressed Dirac neutrino masses.
|
[
{
"created": "Sat, 23 Jun 2012 10:17:59 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Jul 2012 13:58:10 GMT",
"version": "v2"
}
] |
2015-06-05
|
[
[
"Chen",
"Mu-Chun",
""
],
[
"Ratz",
"Michael",
""
],
[
"Staudt",
"Christian",
""
],
[
"Vaudrevange",
"Patrick K. S.",
""
]
] |
The well-known Giudice-Masiero mechanism explains the presence of a mu term of the order of the gravitino mass, but does not explain why the holomorphic mass term is absent in the superpotential. We discuss anomaly-free discrete symmetries which are both compatible with SU(5) unification of matter and the Giudice-Masiero mechanism, i.e. forbid the mu term in the superpotential while allowing the necessary Kaehler potential term. We find that these are Z_M^R symmetries with the following properties: (i) M is a multiple of four; (ii) the Higgs bilinear H_u H_d transforms trivially; (iii) the superspace coordinate theta has charge M/4 and, accordingly, the superpotential has charge M/2; (iv) dimension five proton decay operators are automatically absent. All Z_M^R symmetries are anomaly-free due to a non-trivial transformation of a Green-Schwarz axion, and, as a consequence, a holomorphic mu term appears at the non-perturbative level. There is a unique symmetry that is consistent with the Weinberg operator while there is a class of Z_M^R symmetries which explain suppressed Dirac neutrino masses.
|
2407.13639
|
Niyati Venkatesan
|
Kimmo Kainulainen, Niyati Venkatesan
|
Systematic moment expansion for electroweak baryogenesis
|
24 pages, 8 figures
| null | null | null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a systematic moment expansion for solving the semiclassical
Boltzmann equations for electroweak baryogenesis. The expansion is developed in
powers of adiabatic coordinate velocity, and it is used for computing the
CP-violating seed asymmetry at the front of the phase transition wall, that
sources the eventual baryon asymmetry of the universe (BAU). We implement the
method in a benchmark model, with a CP-violating mass arising from a
dimension-5 operator coupling the fermion to a singlet scalar field. We find
that the higher moment calculations yield a BAU that can significantly differ
from the commonly used two-moment approximation. We discuss in detail the
underlying approximations in the moment method and propose a new truncation
scheme for the expansion, that appears to give more numerically robust results
than the previous schemes.
|
[
{
"created": "Thu, 18 Jul 2024 16:17:29 GMT",
"version": "v1"
}
] |
2024-07-19
|
[
[
"Kainulainen",
"Kimmo",
""
],
[
"Venkatesan",
"Niyati",
""
]
] |
We present a systematic moment expansion for solving the semiclassical Boltzmann equations for electroweak baryogenesis. The expansion is developed in powers of adiabatic coordinate velocity, and it is used for computing the CP-violating seed asymmetry at the front of the phase transition wall, that sources the eventual baryon asymmetry of the universe (BAU). We implement the method in a benchmark model, with a CP-violating mass arising from a dimension-5 operator coupling the fermion to a singlet scalar field. We find that the higher moment calculations yield a BAU that can significantly differ from the commonly used two-moment approximation. We discuss in detail the underlying approximations in the moment method and propose a new truncation scheme for the expansion, that appears to give more numerically robust results than the previous schemes.
|
2110.04271
|
Tae Hyun Jung
|
Tae Hyun Jung and Takemichi Okui
|
Primordial black holes from bubble collisions during a first-order phase
transition
|
6 pages + 10 pages of supplemental material, 7 figures, v3: Major
revision with significant improvement in presentation and analysis.
Conclusion unchanged
| null | null |
KEK-TH-2350
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We find that collisions of near-horizon-sized bubbles with a thick fluid
shell can produce primordial black holes (PBHs) during a first-order phase
transition. We predict an approximately monochromatic PBH mass spectrum. In
terms of a few parameters to be obtained from future numerical simulation, we
estimate the PBH abundance in an Abelian Higgs benchmark model and show that it
can be significant. In particular, the PBHs can constitute entire dark matter
or even over-close the universe. Our result thus shows that models with a
first-order phase transition can be constrained by over-abundant PBHs or null
results of other PBH searches.
|
[
{
"created": "Fri, 8 Oct 2021 17:33:54 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Nov 2021 22:38:57 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Dec 2023 17:52:15 GMT",
"version": "v3"
}
] |
2023-12-27
|
[
[
"Jung",
"Tae Hyun",
""
],
[
"Okui",
"Takemichi",
""
]
] |
We find that collisions of near-horizon-sized bubbles with a thick fluid shell can produce primordial black holes (PBHs) during a first-order phase transition. We predict an approximately monochromatic PBH mass spectrum. In terms of a few parameters to be obtained from future numerical simulation, we estimate the PBH abundance in an Abelian Higgs benchmark model and show that it can be significant. In particular, the PBHs can constitute entire dark matter or even over-close the universe. Our result thus shows that models with a first-order phase transition can be constrained by over-abundant PBHs or null results of other PBH searches.
|
2005.08816
|
Xi-Jie Zhan
|
Xi-Jie Zhan, Jian-Xiong Wang
|
Prompt $J/\psi$ photoproduction within the non-relativistic QCD
framework at the CEPC
| null | null |
10.1140/epjc/s10052-020-8276-0
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The prompt $J/\psi$ photoproduction within the non-relativistic QCD (NRQCD)
framework at the future Circular Electron Positron Collider (CEPC) is studied,
including the contributions from both direct and resolved photons. Employing
different sets of long distance matrix elements, the total cross section is
dominated by the color-octet channel. We present different kinematic
distributions of $J/\psi$ production and the results show there will be about
50 $J/\psi$ events when the transverse momentum of $J/\psi$ is up to 20 GeV. It
renders that the $J/\psi$ photoprodution at the CEPC is a well laboratory to
test the NRQCD and further clarify the universality problem in NRQCD between
electron positron collider and hadron collider.
|
[
{
"created": "Mon, 18 May 2020 15:49:39 GMT",
"version": "v1"
}
] |
2021-02-03
|
[
[
"Zhan",
"Xi-Jie",
""
],
[
"Wang",
"Jian-Xiong",
""
]
] |
The prompt $J/\psi$ photoproduction within the non-relativistic QCD (NRQCD) framework at the future Circular Electron Positron Collider (CEPC) is studied, including the contributions from both direct and resolved photons. Employing different sets of long distance matrix elements, the total cross section is dominated by the color-octet channel. We present different kinematic distributions of $J/\psi$ production and the results show there will be about 50 $J/\psi$ events when the transverse momentum of $J/\psi$ is up to 20 GeV. It renders that the $J/\psi$ photoprodution at the CEPC is a well laboratory to test the NRQCD and further clarify the universality problem in NRQCD between electron positron collider and hadron collider.
|
2204.07802
|
Yu Zhang
|
Yu Zhang, Mao Song, Ran Ding, Liangwen Chen
|
Neutrino dipole portal at electron colliders
|
11 pages, 3 figures, accepted for publication in Physics Letters B
| null |
10.1016/j.physletb.2022.137116
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We propose to search for a heavy neutral lepton (HNL), that is also know as
sterile neutrino, in electron colliders running with the center-of-mass
energies at few GeV, including BESIII, Belle II, and the proposed Super Tau
Charm Factory (STCF). We consider the HNL interacting with Standard Model
neutrino and photon via a transition magnetic moment, the so-called dipole
portal.We use the monophoton signature at electron colliders to probe the
constraints on the active-sterile neutrino transition magnetic moments $d$ as
the function of the HNL's mass $m_N$.It is found that BESIII, Belle II and STCF
can probe the upper limits for $d$ down to 1.3 $\times 10^{-5}\ {\rm
GeV}^{-1}$, 8 $\times 10^{-6}\ {\rm GeV}^{-1}$, and 1.3 $\times 10^{-6}\ {\rm
GeV}^{-1}$ with $m_N$ around GeV scale, respectively, and have sensitivity to
the previously unexplored parameter space for electron- ($d_e$) and
tau-neutrino ($d_\tau$) dipole portal with $m_N$ from dozens to thounsands MeV.
On $d_\mu$ for HNL mixing with the {muon}-neutrino, Belle II and STCF can also
provide leading constraints.
|
[
{
"created": "Sat, 16 Apr 2022 14:01:37 GMT",
"version": "v1"
}
] |
2022-05-11
|
[
[
"Zhang",
"Yu",
""
],
[
"Song",
"Mao",
""
],
[
"Ding",
"Ran",
""
],
[
"Chen",
"Liangwen",
""
]
] |
We propose to search for a heavy neutral lepton (HNL), that is also know as sterile neutrino, in electron colliders running with the center-of-mass energies at few GeV, including BESIII, Belle II, and the proposed Super Tau Charm Factory (STCF). We consider the HNL interacting with Standard Model neutrino and photon via a transition magnetic moment, the so-called dipole portal.We use the monophoton signature at electron colliders to probe the constraints on the active-sterile neutrino transition magnetic moments $d$ as the function of the HNL's mass $m_N$.It is found that BESIII, Belle II and STCF can probe the upper limits for $d$ down to 1.3 $\times 10^{-5}\ {\rm GeV}^{-1}$, 8 $\times 10^{-6}\ {\rm GeV}^{-1}$, and 1.3 $\times 10^{-6}\ {\rm GeV}^{-1}$ with $m_N$ around GeV scale, respectively, and have sensitivity to the previously unexplored parameter space for electron- ($d_e$) and tau-neutrino ($d_\tau$) dipole portal with $m_N$ from dozens to thounsands MeV. On $d_\mu$ for HNL mixing with the {muon}-neutrino, Belle II and STCF can also provide leading constraints.
|
hep-ph/9602308
|
Oleg Kalashnikov
|
O.K.Kalashnikov
|
Magnetic Mass in Hot Scalar Electrodynamics
|
6 pages, Latex
| null | null |
BI-TH 96/09
|
hep-ph hep-th
| null |
Using the Slavnov-Taylor identities we prove that the so-called "magnetic
mass" is exactly equal to zero within hot scalar electrodynamics. The same
result is valid for hot QED and seems for any abelian theory but this is not
the case for hot QCD where one expects that $\m\ne 0$.
|
[
{
"created": "Wed, 14 Feb 1996 14:20:54 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kalashnikov",
"O. K.",
""
]
] |
Using the Slavnov-Taylor identities we prove that the so-called "magnetic mass" is exactly equal to zero within hot scalar electrodynamics. The same result is valid for hot QED and seems for any abelian theory but this is not the case for hot QCD where one expects that $\m\ne 0$.
|
1809.04038
|
Andrzej Kup\'s\'c Dr
|
Elisabetta Perotti, G\"oran F\"aldt, Andrzej Kup\'s\'c, Stefan Leupold
(Uppsala U.) and Jiao Jiao Song (Shandong U. and Beijing, Inst. High Energy
Phys.)
|
Polarization observables in $e^+e^-$ annihilation to a baryon-antibaryon
pair
|
16 pages;update: 1 figure, extended introduction and examples,
results not changed
|
Phys. Rev. D 99, 056008 (2019)
|
10.1103/PhysRevD.99.056008
| null |
hep-ph hep-ex nucl-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using the helicity formalism of Jacob and Wick we derive spin density
matrices of baryon antibaryon pairs produced in $e^+e^-$ annihilation. We
consider the production of pairs with spins $1/2+\overline{1/2}$,
$1/2+\overline{3/2}$ (+c.c.) and $3/2+\overline{3/2}$. We provide modular
expressions to include chains of weak hadronic two-body decays of the produced
hyperons. The expressions are suitable for the analysis of high statistics data
from $J/\psi$ and $\psi(2S)$ decays at $e^+e^-$ colliders, by fits to the fully
differential angular distributions of the measured particles. We illustrate the
method by examples, such as the inclusive measurement of the
$e^+e^-\to\psi(2S)\to\Omega^-\bar\Omega^+$ process where one decay chain
$\Omega^-\to\Lambda K^-$ followed by $\Lambda\to p\pi^-$ is considered. Finally
we show that the inclusive angular distributions can be used to test spin
assignment of the produced baryons.
|
[
{
"created": "Tue, 11 Sep 2018 17:08:42 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Feb 2019 03:23:12 GMT",
"version": "v2"
}
] |
2019-03-27
|
[
[
"Perotti",
"Elisabetta",
"",
"Uppsala U."
],
[
"Fäldt",
"Göran",
"",
"Uppsala U."
],
[
"Kupść",
"Andrzej",
"",
"Uppsala U."
],
[
"Leupold",
"Stefan",
"",
"Uppsala U."
],
[
"Song",
"Jiao Jiao",
"",
"Shandong U. and Beijing, Inst. High Energy\n Phys."
]
] |
Using the helicity formalism of Jacob and Wick we derive spin density matrices of baryon antibaryon pairs produced in $e^+e^-$ annihilation. We consider the production of pairs with spins $1/2+\overline{1/2}$, $1/2+\overline{3/2}$ (+c.c.) and $3/2+\overline{3/2}$. We provide modular expressions to include chains of weak hadronic two-body decays of the produced hyperons. The expressions are suitable for the analysis of high statistics data from $J/\psi$ and $\psi(2S)$ decays at $e^+e^-$ colliders, by fits to the fully differential angular distributions of the measured particles. We illustrate the method by examples, such as the inclusive measurement of the $e^+e^-\to\psi(2S)\to\Omega^-\bar\Omega^+$ process where one decay chain $\Omega^-\to\Lambda K^-$ followed by $\Lambda\to p\pi^-$ is considered. Finally we show that the inclusive angular distributions can be used to test spin assignment of the produced baryons.
|
hep-ph/9706452
|
Nestor Armesto
|
N. Armesto and A. Capella
|
Interpretations of $J/\psi$ suppression
|
12 pages, LaTeX, uses epsfig and ioplppt; review talk given by A.
Capella at the International Symposium on Strangness in Quark Matter,
Santorini (Greece), April 1997; Figs. 1 and 2 not available but can be found
in Refs. 13 and 6 respectively
|
J.Phys.G23:1969-1977,1997
|
10.1088/0954-3899/23/12/022
|
LPTHE Orsay 97/31
|
hep-ph
| null |
We review the two main interpretations of $J/\psi$ suppression proposed in
the literature. The phase transition (or deconfining) scenario assumes that
below some critical value of the local energy density (or of some other
geometrical quantity which depends both on the colliding systems and on the
centrality of the collision), there is only nuclear absorption. Above this
critical value the absorptive cross-section is taken to be infinite, i.e. no
$J/\psi$ can survive in this hot region. In the hadronic scenario the $J/\psi$
dissociates due both to nuclear absorption and to its interactions with
co-moving hadrons produced in the collision. No discontinuity exists in
physical observables. We show that an equally good description of the present
data is possible in either scenario.
|
[
{
"created": "Mon, 23 Jun 1997 09:31:56 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Armesto",
"N.",
""
],
[
"Capella",
"A.",
""
]
] |
We review the two main interpretations of $J/\psi$ suppression proposed in the literature. The phase transition (or deconfining) scenario assumes that below some critical value of the local energy density (or of some other geometrical quantity which depends both on the colliding systems and on the centrality of the collision), there is only nuclear absorption. Above this critical value the absorptive cross-section is taken to be infinite, i.e. no $J/\psi$ can survive in this hot region. In the hadronic scenario the $J/\psi$ dissociates due both to nuclear absorption and to its interactions with co-moving hadrons produced in the collision. No discontinuity exists in physical observables. We show that an equally good description of the present data is possible in either scenario.
|
hep-ph/0210400
|
Stephen Godfrey
|
Stephen Godfrey (Carleton University, DESY)
|
Topics in Meson Spectroscopy
|
Invited talk given at 31st International Conference on High Energy
Physics (ICHEP 2002), Amsterdam, The Netherlands, 24-31 Jul 2002
| null |
10.1016/S0920-5632(03)90640-2
|
DESY 02-170
|
hep-ph
| null |
In this mini-review I discuss three topics in meson spectroscopy. The
production of heavy quarkonium states, S-wave scattering below 1 GeV, and
exotic hybrid meson production. This is not intended to be a comprehensive
review, just an overview of several topics of current interest.
|
[
{
"created": "Tue, 29 Oct 2002 10:33:38 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Godfrey",
"Stephen",
"",
"Carleton University, DESY"
]
] |
In this mini-review I discuss three topics in meson spectroscopy. The production of heavy quarkonium states, S-wave scattering below 1 GeV, and exotic hybrid meson production. This is not intended to be a comprehensive review, just an overview of several topics of current interest.
|
1105.4984
|
Sanjib Kumar Agarwalla
|
Sanjib Kumar Agarwalla, J.M. Conrad, M.H. Shaevitz
|
Short-baseline Neutrino Oscillation Waves in Ultra-large Liquid
Scintillator Detectors
|
24 pages, 8 figures, 9 tables
| null |
10.1007/JHEP12(2011)085
|
EURONU-WP6-11-32, IFIC/11-22
|
hep-ph hep-ex physics.ins-det
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Powerful new multi-kiloton liquid scintillator neutrino detectors, including
NOvA and LENA, will come on-line within the next decade. When these are coupled
with a modest-power decay-at-rest (DAR) neutrino source at short-baseline,
these detectors can decisively address the recent ambiguous signals for
neutrino oscillations at high Delta m^2. These detectors are > 50 m long, and
so with a DAR beam, the characteristic oscillation wave will be apparent over
the length of the detector, providing a powerful verification of the
oscillation phenomena. LENA can simultaneously perform numubar to nuebar
appearance and nue to nue disappearance searches with unprecedented
sensitivity. NOvA is likely limited to nue disappearance given its present
design, but also has excellent sensitivity in the high Delta m^2 region. For
the appearance channel, LENA could provide a stringent test of the LSND and
MiniBooNE signal regions at > 5 sigma with a reduced fiducial volume of 5 kt
and a 10 kW neutrino source. In addition, the LENA and NOvA disappearance
sensitivities in nue mode are complementary to the recent reactor anomaly
indicating possible nuebar disappearance and would cover this possible
oscillation signal at the 3 sigma level.
|
[
{
"created": "Wed, 25 May 2011 10:07:33 GMT",
"version": "v1"
}
] |
2015-05-28
|
[
[
"Agarwalla",
"Sanjib Kumar",
""
],
[
"Conrad",
"J. M.",
""
],
[
"Shaevitz",
"M. H.",
""
]
] |
Powerful new multi-kiloton liquid scintillator neutrino detectors, including NOvA and LENA, will come on-line within the next decade. When these are coupled with a modest-power decay-at-rest (DAR) neutrino source at short-baseline, these detectors can decisively address the recent ambiguous signals for neutrino oscillations at high Delta m^2. These detectors are > 50 m long, and so with a DAR beam, the characteristic oscillation wave will be apparent over the length of the detector, providing a powerful verification of the oscillation phenomena. LENA can simultaneously perform numubar to nuebar appearance and nue to nue disappearance searches with unprecedented sensitivity. NOvA is likely limited to nue disappearance given its present design, but also has excellent sensitivity in the high Delta m^2 region. For the appearance channel, LENA could provide a stringent test of the LSND and MiniBooNE signal regions at > 5 sigma with a reduced fiducial volume of 5 kt and a 10 kW neutrino source. In addition, the LENA and NOvA disappearance sensitivities in nue mode are complementary to the recent reactor anomaly indicating possible nuebar disappearance and would cover this possible oscillation signal at the 3 sigma level.
|
1707.09886
|
Yang Ma
|
Yang Ma, Xing-Gang Wu
|
Renormalization scheme dependence of high-Order perturbative QCD
predictions
|
7 Page, 6 figures. Revised version to be published in Phys.Rev.D
|
Phys. Rev. D 97, 036024 (2018)
|
10.1103/PhysRevD.97.036024
|
PITT PACC-1708
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Conventionally, one adopts typical momentum flow of a physical observable as
the renormalization scale for its perturbative QCD (pQCD) approximant. This
simple treatment leads to renormalization scheme-and-scale ambiguities due to
the renormalization scheme and scale dependence of the strong coupling and the
perturbative coefficients do not exactly cancel at any fixed order. It is
believed that those ambiguities will be softened by including more higher-order
terms. In the paper, to show how the renormalization scheme dependence changes
when more loop terms have been included, we discuss the sensitivity of pQCD
prediction on the scheme parameters by using the scheme-dependent $\{\beta_{m
\geq 2}\}$-terms. We adopt two four-loop examples, $e^+ e^- \to {\rm hadrons}$
and $\tau$ decays into hadrons, for detailed analysis. Our results show that
under the conventional scale setting, by including more-and-more loop terms,
the scheme dependence of the pQCD prediction cannot be reduced as efficiently
as that of the scale dependence. Thus a proper scale-setting approach should be
important to reduce the scheme dependence. We observe that the principle of
minimum sensitivity could be such a scale-setting approach, which provides a
practical way to achieve optimal scheme and scale by requiring the pQCD
approximate be independent to the "unphysical" theoretical conventions.
|
[
{
"created": "Mon, 31 Jul 2017 14:36:08 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Jan 2018 07:33:46 GMT",
"version": "v2"
},
{
"created": "Fri, 2 Mar 2018 04:56:27 GMT",
"version": "v3"
}
] |
2018-03-05
|
[
[
"Ma",
"Yang",
""
],
[
"Wu",
"Xing-Gang",
""
]
] |
Conventionally, one adopts typical momentum flow of a physical observable as the renormalization scale for its perturbative QCD (pQCD) approximant. This simple treatment leads to renormalization scheme-and-scale ambiguities due to the renormalization scheme and scale dependence of the strong coupling and the perturbative coefficients do not exactly cancel at any fixed order. It is believed that those ambiguities will be softened by including more higher-order terms. In the paper, to show how the renormalization scheme dependence changes when more loop terms have been included, we discuss the sensitivity of pQCD prediction on the scheme parameters by using the scheme-dependent $\{\beta_{m \geq 2}\}$-terms. We adopt two four-loop examples, $e^+ e^- \to {\rm hadrons}$ and $\tau$ decays into hadrons, for detailed analysis. Our results show that under the conventional scale setting, by including more-and-more loop terms, the scheme dependence of the pQCD prediction cannot be reduced as efficiently as that of the scale dependence. Thus a proper scale-setting approach should be important to reduce the scheme dependence. We observe that the principle of minimum sensitivity could be such a scale-setting approach, which provides a practical way to achieve optimal scheme and scale by requiring the pQCD approximate be independent to the "unphysical" theoretical conventions.
|
hep-ph/0407134
|
Szymanowski Lech dr
|
M. Diehl, B. Pire, L.Szymanowski
|
Exclusive Electroproduction of Pentaquarks
|
6 pages LATEX, 2 .eps figures, talk presented at DIS04, Strbske
Pleso, Slovakia, April 2004
| null | null | null |
hep-ph
| null |
Exclusive electroproduction of a K or K^* meson on the nucleon can give a
Theta^+ pentaquark in the final state. This reaction offers an opportunity to
investigate the structure of pentaquark baryons at parton level. We discuss the
generalized parton distributions for the N -> Theta^+ transition and give the
leading order amplitude for electroproduction in the Bjorken regime.
|
[
{
"created": "Mon, 12 Jul 2004 14:42:58 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Diehl",
"M.",
""
],
[
"Pire",
"B.",
""
],
[
"Szymanowski",
"L.",
""
]
] |
Exclusive electroproduction of a K or K^* meson on the nucleon can give a Theta^+ pentaquark in the final state. This reaction offers an opportunity to investigate the structure of pentaquark baryons at parton level. We discuss the generalized parton distributions for the N -> Theta^+ transition and give the leading order amplitude for electroproduction in the Bjorken regime.
|
1905.02564
|
Murat Koksal
|
M. K\"oksal, A. A. Billur, A. Guti\'errez-Rodr\'iguez and M. A.
Hern\'andez-Ru\'iz
|
Sensitivity measuring expected on the electromagnetic anomalous
couplings in the $t\bar t\gamma$ vertex at the FCC-he
|
28 pages, 10 figures and 7 tables. arXiv admin note: text overlap
with arXiv:1812.08971
| null |
10.1142/S0217751X2050178X
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we consider the electroweak production cross-section of a
single anti-top-quark, a neutrino and a photon via charged current through the
$e^-p \to e^-\bar b \to \bar t \nu_e \gamma \to \bar t(\to W^- \to (qq', l^-
\bar\nu_l)+b) \nu_e\gamma$ signal. Further, we derived the sensitivity expected
to the magnetic dipole moment $(\hat a_V)$ and the electric dipole moment
$(\hat a_A)$ of the top-quark at the Future Circular Collider Hadron Electron
(FCC-he). We present our study for $\sqrt{s}=7.07, 10\hspace{0.8mm}TeV$, ${\cal
L}=50, 100, 300, 500, 1000\hspace{0.8mm}fb^{-1}$, $\delta_{sys}=0, 3,
5\hspace{0.8mm}\%$ and $P_{e^-}=0\%, 80\%, -80\%$, respectively. We find that
the sensitivity estimated on dipole moments of the top-quark is of the order of
magnitude ${\cal O}(10^{-1})$ for both hadronic and leptonic decay modes of
$W^-$: $\hat a_V=[-0.2308, 0.2204]$, $|\hat a_A|=0.2259$ at $95\%$ C.L. in the
hadronic channel with unpolarized electron beam $P_{e^-}=0\%$. Our results with
polarized electron beam for $P_{e^-}=80\%$ and $P_{e^-}=-80\%$ are $\hat
a_V=[-0.3428, 0.3321]$, $|\hat a_A|=0.3371$ and $\hat a_V=[-0.2041, 0.1858]$,
$|\hat a_A|=0.1939$ at $95\%$ C.L. in the hadronic channel. The corresponding
results for the leptonic channel with $P_{e^-}=0\%, 80\% -80\%$ are $\hat
a_V=[-0.3067, 0.2963]$, $|\hat a_A|=0.3019$, $\hat a_V=[-0.4563, 0.4456]$,
$|\hat a_A|=0.4505$ and $\hat a_V=[-0.2695, 0.2512]$, $|\hat a_A|=0.2592$,
respectively. The results for $\hat a_V$ and $\hat a_A$ in the leptonic channel
are weaker by a factor of 0.75 than those corresponding to the hadronic
channel. Given these prospective sensitivities we highlight that the FCC-he is
potential top-quark factory that is particularly well suited to sensitivity
study on its dipole moments and with cleaner environments.
|
[
{
"created": "Sun, 5 May 2019 17:59:06 GMT",
"version": "v1"
}
] |
2020-10-28
|
[
[
"Köksal",
"M.",
""
],
[
"Billur",
"A. A.",
""
],
[
"Gutiérrez-Rodríguez",
"A.",
""
],
[
"Hernández-Ruíz",
"M. A.",
""
]
] |
In this paper, we consider the electroweak production cross-section of a single anti-top-quark, a neutrino and a photon via charged current through the $e^-p \to e^-\bar b \to \bar t \nu_e \gamma \to \bar t(\to W^- \to (qq', l^- \bar\nu_l)+b) \nu_e\gamma$ signal. Further, we derived the sensitivity expected to the magnetic dipole moment $(\hat a_V)$ and the electric dipole moment $(\hat a_A)$ of the top-quark at the Future Circular Collider Hadron Electron (FCC-he). We present our study for $\sqrt{s}=7.07, 10\hspace{0.8mm}TeV$, ${\cal L}=50, 100, 300, 500, 1000\hspace{0.8mm}fb^{-1}$, $\delta_{sys}=0, 3, 5\hspace{0.8mm}\%$ and $P_{e^-}=0\%, 80\%, -80\%$, respectively. We find that the sensitivity estimated on dipole moments of the top-quark is of the order of magnitude ${\cal O}(10^{-1})$ for both hadronic and leptonic decay modes of $W^-$: $\hat a_V=[-0.2308, 0.2204]$, $|\hat a_A|=0.2259$ at $95\%$ C.L. in the hadronic channel with unpolarized electron beam $P_{e^-}=0\%$. Our results with polarized electron beam for $P_{e^-}=80\%$ and $P_{e^-}=-80\%$ are $\hat a_V=[-0.3428, 0.3321]$, $|\hat a_A|=0.3371$ and $\hat a_V=[-0.2041, 0.1858]$, $|\hat a_A|=0.1939$ at $95\%$ C.L. in the hadronic channel. The corresponding results for the leptonic channel with $P_{e^-}=0\%, 80\% -80\%$ are $\hat a_V=[-0.3067, 0.2963]$, $|\hat a_A|=0.3019$, $\hat a_V=[-0.4563, 0.4456]$, $|\hat a_A|=0.4505$ and $\hat a_V=[-0.2695, 0.2512]$, $|\hat a_A|=0.2592$, respectively. The results for $\hat a_V$ and $\hat a_A$ in the leptonic channel are weaker by a factor of 0.75 than those corresponding to the hadronic channel. Given these prospective sensitivities we highlight that the FCC-he is potential top-quark factory that is particularly well suited to sensitivity study on its dipole moments and with cleaner environments.
|
hep-ph/9608225
|
Masashi Hayakawa
|
M. Hayakawa ( KEK )
|
Remarks on the Hadronic Effect in Muon $g-2$: Low Energy Behavior of
$V^0 $-$\pi^+$ Scattering
|
12 pages, REVTEX, 4 figures, Title and some other minor changes ( to
appear in Phys. Rev. D )
|
Phys.Rev.D54:6586-6590,1996
|
10.1103/PhysRevD.54.R6586
|
KEK-TH-491, KEK Preprint 96-93
|
hep-ph
| null |
The behavior of the $V^0$-$\pi^+$ scattering amplitude (where $V^0 = \rho^0 ,
\omega$ , or $\phi$) in the low pion momentum limit is studied motivated by its
relevance to the theory of muon $g - 2$. Current algebra analysis shows that
its S-wave component must vanish in the chiral limit under general physical
assumptions. We confirm this result with various low energy models of vector
meson. Our result justifies the calculation of the charged pion loop part of
the hadronic light-by-light scattering contribution to muon $ g-2 $ within the
framework of hidden local symmetry model of low energy hadron dynamics.
|
[
{
"created": "Mon, 5 Aug 1996 04:25:55 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Oct 1996 07:58:01 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Oct 1996 03:58:22 GMT",
"version": "v3"
}
] |
2009-12-30
|
[
[
"Hayakawa",
"M.",
"",
"KEK"
]
] |
The behavior of the $V^0$-$\pi^+$ scattering amplitude (where $V^0 = \rho^0 , \omega$ , or $\phi$) in the low pion momentum limit is studied motivated by its relevance to the theory of muon $g - 2$. Current algebra analysis shows that its S-wave component must vanish in the chiral limit under general physical assumptions. We confirm this result with various low energy models of vector meson. Our result justifies the calculation of the charged pion loop part of the hadronic light-by-light scattering contribution to muon $ g-2 $ within the framework of hidden local symmetry model of low energy hadron dynamics.
|
hep-ph/9703252
|
Peter Kroll
|
Jan Bolz and Peter Kroll
|
Exclusive J/Psi and Psi'decays into baryon-antibaryon pairs
|
20 pages, 7 postscript figures, amstex
|
Eur.Phys.J.C2:545-556,1998
|
10.1007/s100520050160
|
WU B 97-2
|
hep-ph
| null |
Within a perturbative approach we investigate decays of charmonium states
into baryon-antibaryon pairs. Using a recently proposed wave function for the
nucleon and suitable generalizations of it to the hyperons and decouplet
baryons, we obtain the decay widths for the baryon-antibaryon channels in
reasonable agreement with data. An important difference to previous work is the
use of the c-quark mass in the perturbative calculation instead of the
charmonium mass. As a consequence of this feature our approach possesses, the
J/Psi and the Psi' decay widths do not scale with a high power of the ratio of
their masses.
|
[
{
"created": "Thu, 6 Mar 1997 10:51:14 GMT",
"version": "v1"
}
] |
2010-11-19
|
[
[
"Bolz",
"Jan",
""
],
[
"Kroll",
"Peter",
""
]
] |
Within a perturbative approach we investigate decays of charmonium states into baryon-antibaryon pairs. Using a recently proposed wave function for the nucleon and suitable generalizations of it to the hyperons and decouplet baryons, we obtain the decay widths for the baryon-antibaryon channels in reasonable agreement with data. An important difference to previous work is the use of the c-quark mass in the perturbative calculation instead of the charmonium mass. As a consequence of this feature our approach possesses, the J/Psi and the Psi' decay widths do not scale with a high power of the ratio of their masses.
|
hep-ph/0204247
|
Biswajoy Brahmachari
|
Biswajoy Brahmachari (Vidyasagar Evening College)
|
E_6 multiplets and unification in extra dimensions
|
Latex, eps figures
|
Acta Phys.Polon. B36 (2005) 1997-2004
| null |
SINP/TNP/02-14
|
hep-ph hep-th
| null |
We study the effect of all matter multiplets contained in {\bf 27}
representation of $E_6$ GUT on gauge coupling unification in extra dimensions.
Extra members of {\bf 27} multiplets of all three generations have their `zero
modes' near $m_t$ such that they can be directly probed. From TeV scale onwards
extra dimensions open up, theory becomes N=2 supersymmetric and gauge couplings
unify or they do not, depending on how we distribute matter fields and gauge
fields in bulk and brane. We find three such possible embedding which will lead
to perfect gauge coupling unification below 100 TeV region for one extra
dimension and lower than that if number of extra dimensions is larger.
|
[
{
"created": "Mon, 22 Apr 2002 08:35:23 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Jun 2005 11:11:22 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Brahmachari",
"Biswajoy",
"",
"Vidyasagar Evening College"
]
] |
We study the effect of all matter multiplets contained in {\bf 27} representation of $E_6$ GUT on gauge coupling unification in extra dimensions. Extra members of {\bf 27} multiplets of all three generations have their `zero modes' near $m_t$ such that they can be directly probed. From TeV scale onwards extra dimensions open up, theory becomes N=2 supersymmetric and gauge couplings unify or they do not, depending on how we distribute matter fields and gauge fields in bulk and brane. We find three such possible embedding which will lead to perfect gauge coupling unification below 100 TeV region for one extra dimension and lower than that if number of extra dimensions is larger.
|
0707.0824
|
Sergey Afonin
|
S. S. Afonin
|
Properties of new unflavored mesons below 2.4 GeV
|
5 pages, to appear in Phys. Rev. C XX, 005200 (2007)
|
Phys.Rev.C76:015202,2007
|
10.1103/PhysRevC.76.015202
| null |
hep-ph
| null |
The global features of spectrum of highly excited light nonstrange mesons can
be well understood within both chiral symmetry restoration scenario combined
with the relation $M^2\sim J+n$ and within nonrelativistic description based on
the relation $M^2\sim L+n$. The predictions of these two alternative
classifications for missing states are different and only future experiments
can distinguish between the two. We elaborate and compare systematically the
predictions of both schemes, which may serve as a suggestion for future
experiments devoted to the search for missing states.
|
[
{
"created": "Thu, 5 Jul 2007 16:38:45 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Afonin",
"S. S.",
""
]
] |
The global features of spectrum of highly excited light nonstrange mesons can be well understood within both chiral symmetry restoration scenario combined with the relation $M^2\sim J+n$ and within nonrelativistic description based on the relation $M^2\sim L+n$. The predictions of these two alternative classifications for missing states are different and only future experiments can distinguish between the two. We elaborate and compare systematically the predictions of both schemes, which may serve as a suggestion for future experiments devoted to the search for missing states.
|
2103.15079
|
Xiaorui Wong
|
Xiaorui Wong and Yongsheng Huang
|
Dark photon production via $\gamma \gamma \rightarrow \gamma A'$
| null |
Eur. Phys. J. C 81, 442 (2021)
|
10.1140/epjc/s10052-021-09228-z
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The dark photon is a new gauge boson which arises from an extra U'(1) gauge
symmetry. In this paper, a novel dark photon production mechanism based on
MeV-scale $\gamma$-$\gamma$ collider is considered: $\gamma \gamma \rightarrow
\gamma A'$. With the aid of PACKAGE-X, differential cross section of $\gamma
\gamma \rightarrow \gamma A'$ is obtained, as a function of the kinetic mixing
parameter $\varepsilon$ and dark photon mass $m_{A'}$. Taking the
light-by-light scattering as background, the constraints on the dark photon
parameter space for different time intervals in a MeV-scale $\gamma$-$\gamma$
collider are also given.
|
[
{
"created": "Sun, 28 Mar 2021 08:14:50 GMT",
"version": "v1"
},
{
"created": "Mon, 10 May 2021 15:39:48 GMT",
"version": "v2"
}
] |
2021-05-25
|
[
[
"Wong",
"Xiaorui",
""
],
[
"Huang",
"Yongsheng",
""
]
] |
The dark photon is a new gauge boson which arises from an extra U'(1) gauge symmetry. In this paper, a novel dark photon production mechanism based on MeV-scale $\gamma$-$\gamma$ collider is considered: $\gamma \gamma \rightarrow \gamma A'$. With the aid of PACKAGE-X, differential cross section of $\gamma \gamma \rightarrow \gamma A'$ is obtained, as a function of the kinetic mixing parameter $\varepsilon$ and dark photon mass $m_{A'}$. Taking the light-by-light scattering as background, the constraints on the dark photon parameter space for different time intervals in a MeV-scale $\gamma$-$\gamma$ collider are also given.
|
1208.0987
|
Oleg Antipin A
|
Oleg Antipin, Matin Mojaza, Francesco Sannino
|
Jumping Out of the Light-Higgs Conformal Window
|
24 pages, 5 figures, minor corrections to match published version
| null |
10.1103/PhysRevD.87.096005
|
CP3-Origins-2012-21; DIAS-2012-22
|
hep-ph hep-lat hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate generic properties of the conformal phase transition in gauge
theories featuring Higgs-like fundamental particles. These theories provide an
excellent arena to properly investigate conformal dynamics and discover novel
features. We show that the phase transition at the boundary of the Higgs
conformal window is not smooth but a jumping one for the known perturbative
examples. In addition the general conditions under which the transition is
either jumping or smooth are provided. Jumping implies that the massive
spectrum of the theory will jump at the phase transition. It, however, still
allows for one of the states, the would be dilaton of the theory, to be lighter
than the heaviest states in the broken phase. Finally we exhibit a calculable
Higgs model in which we can, in perturbation theory, determine the Higgs
conformal window, the spectrum in the conformally broken phase and demonstrate
it to possess a jumping type conformal phase transition.
|
[
{
"created": "Sun, 5 Aug 2012 07:48:47 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jun 2013 11:46:29 GMT",
"version": "v2"
}
] |
2013-06-17
|
[
[
"Antipin",
"Oleg",
""
],
[
"Mojaza",
"Matin",
""
],
[
"Sannino",
"Francesco",
""
]
] |
We investigate generic properties of the conformal phase transition in gauge theories featuring Higgs-like fundamental particles. These theories provide an excellent arena to properly investigate conformal dynamics and discover novel features. We show that the phase transition at the boundary of the Higgs conformal window is not smooth but a jumping one for the known perturbative examples. In addition the general conditions under which the transition is either jumping or smooth are provided. Jumping implies that the massive spectrum of the theory will jump at the phase transition. It, however, still allows for one of the states, the would be dilaton of the theory, to be lighter than the heaviest states in the broken phase. Finally we exhibit a calculable Higgs model in which we can, in perturbation theory, determine the Higgs conformal window, the spectrum in the conformally broken phase and demonstrate it to possess a jumping type conformal phase transition.
|
hep-ph/0207370
|
Gouranga C. Nayak
|
Fred Cooper (LANL), Chung-Wen Kao (Manchester), and Gouranga C. Nayak
(LANL)
|
Non-Zero Magnetic Screening Mass in QED and QCD at One Loop Level in
Non-Equilibrium
|
12 pages latex, 2 figures
| null | null | null |
hep-ph hep-lat hep-th nucl-th
| null |
Using the Schwinger-Keldysh closed time path integral formalism we show that
the magnetic screening mass in QED and QCD at one loop level is non-zero as
long as the single particle distribution function f(\vec{k}) is non-isotropic,
{i.e.} it depends on the direction of the momentum. For isotropic distribution
functions such as those corresponding to thermal equilibrium the magnetic
screening mass at one loop level is found to be zero which is consistent with
finite temperature field theory. The non-zero magnetic screening mass in
non-isotropic non-equlibrium situations has fundamental importance in that it
acts as a natural cut-off to remove infrared divergences in the magnetic
sector. Thus it allows one to avoid infrared problems which previously made it
difficult to use a transport theory approach using perturbative QCD or QED
scattering kernels to study the thermalization of a QED or QCD plasma.
|
[
{
"created": "Wed, 31 Jul 2002 18:17:01 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Cooper",
"Fred",
"",
"LANL"
],
[
"Kao",
"Chung-Wen",
"",
"Manchester"
],
[
"Nayak",
"Gouranga C.",
"",
"LANL"
]
] |
Using the Schwinger-Keldysh closed time path integral formalism we show that the magnetic screening mass in QED and QCD at one loop level is non-zero as long as the single particle distribution function f(\vec{k}) is non-isotropic, {i.e.} it depends on the direction of the momentum. For isotropic distribution functions such as those corresponding to thermal equilibrium the magnetic screening mass at one loop level is found to be zero which is consistent with finite temperature field theory. The non-zero magnetic screening mass in non-isotropic non-equlibrium situations has fundamental importance in that it acts as a natural cut-off to remove infrared divergences in the magnetic sector. Thus it allows one to avoid infrared problems which previously made it difficult to use a transport theory approach using perturbative QCD or QED scattering kernels to study the thermalization of a QED or QCD plasma.
|
1907.11846
|
Adam Coogan
|
Adam Coogan, Logan Morrison and Stefano Profumo
|
Hazma: A Python Toolkit for Studying Indirect Detection of Sub-GeV Dark
Matter
|
Minor revisions; fixed typos in FSR spectra
| null |
10.1088/1475-7516/2020/01/056
| null |
hep-ph astro-ph.HE physics.comp-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
With several proposed MeV gamma-ray telescopes on the horizon, it is of
paramount importance to perform accurate calculations of gamma-ray spectra
expected from sub-GeV dark matter annihilation and decay. We present hazma, a
python package for reliably computing these spectra, determining the resulting
constraints from existing gamma-ray data, and prospects for upcoming
telescopes. For high-level analyses, hazma comes with several built-in dark
matter models where the interactions between dark matter and hadrons have been
determined in detail using chiral perturbation theory. Additionally, hazma
provides tools for computing spectra from individual final states with
arbitrary numbers of light leptons and mesons, and for analyzing custom dark
matter models. hazma can also produce electron and positron spectra from dark
matter annihilation, enabling precise derivation of constraints from the cosmic
microwave background.
|
[
{
"created": "Sat, 27 Jul 2019 04:17:54 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Sep 2019 21:14:56 GMT",
"version": "v2"
},
{
"created": "Fri, 6 Dec 2019 00:31:31 GMT",
"version": "v3"
}
] |
2020-02-05
|
[
[
"Coogan",
"Adam",
""
],
[
"Morrison",
"Logan",
""
],
[
"Profumo",
"Stefano",
""
]
] |
With several proposed MeV gamma-ray telescopes on the horizon, it is of paramount importance to perform accurate calculations of gamma-ray spectra expected from sub-GeV dark matter annihilation and decay. We present hazma, a python package for reliably computing these spectra, determining the resulting constraints from existing gamma-ray data, and prospects for upcoming telescopes. For high-level analyses, hazma comes with several built-in dark matter models where the interactions between dark matter and hadrons have been determined in detail using chiral perturbation theory. Additionally, hazma provides tools for computing spectra from individual final states with arbitrary numbers of light leptons and mesons, and for analyzing custom dark matter models. hazma can also produce electron and positron spectra from dark matter annihilation, enabling precise derivation of constraints from the cosmic microwave background.
|
1901.04761
|
Seungwon Baek
|
Seungwon Baek
|
Scalar dark matter behind $b \to s \mu \mu$ anomaly
|
26 pages, 14 figures, matches the published version
|
JHEP 1905 (2019) 104
|
10.1007/JHEP05(2019)104
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We construct a scalar dark matter model with $U(1)_{L_\mu-L_\tau}$ symmetry
in which the dark matter interacts with the quark flavours, allowing lepton
non-universal $b \to s \ell \bar{\ell}$ decays. The model can solve $b \to s
\mu \mu$ ($R_{K^{(*)}}$) anomaly and accommodate the relic abundance of dark
matter simultaneously while satisfying the constraints from other low energy
flavour experiments and direct detection experiments of dark matter. The new
fields include vector-like heavy quarks $U$ and $D$, $U(1)_{L_\mu-L_\tau}$
breaking scalar $S$, as well as the dark matter candidate $X_I$ and its heavy
partner $X_R$. To explain both $b \to s \mu \mu$ anomaly and the dark matter,
{\it i)} large mass difference between $X_R$ and $X_I$ is required, {\it ii)}
electroweak scale dark matter and heavy quarks are favoured, {\it iii)} not
only electroweak scale but ${\cal O}(10)$ TeV dark gauge boson $Z'$ and $X_R$
are allowed.
|
[
{
"created": "Tue, 15 Jan 2019 10:54:16 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Nov 2019 11:54:51 GMT",
"version": "v2"
}
] |
2019-11-13
|
[
[
"Baek",
"Seungwon",
""
]
] |
We construct a scalar dark matter model with $U(1)_{L_\mu-L_\tau}$ symmetry in which the dark matter interacts with the quark flavours, allowing lepton non-universal $b \to s \ell \bar{\ell}$ decays. The model can solve $b \to s \mu \mu$ ($R_{K^{(*)}}$) anomaly and accommodate the relic abundance of dark matter simultaneously while satisfying the constraints from other low energy flavour experiments and direct detection experiments of dark matter. The new fields include vector-like heavy quarks $U$ and $D$, $U(1)_{L_\mu-L_\tau}$ breaking scalar $S$, as well as the dark matter candidate $X_I$ and its heavy partner $X_R$. To explain both $b \to s \mu \mu$ anomaly and the dark matter, {\it i)} large mass difference between $X_R$ and $X_I$ is required, {\it ii)} electroweak scale dark matter and heavy quarks are favoured, {\it iii)} not only electroweak scale but ${\cal O}(10)$ TeV dark gauge boson $Z'$ and $X_R$ are allowed.
|
hep-ph/9909526
|
Athenasios Dedes
|
A. Dedes and S. Moretti (Rutherford Appleton Lab.)
|
Higgs boson production in association with squark pairs in the MSSM at
the LHC
|
4 pages, Talk given by A. Dedes at the XIth Recontres de Blois,
``Frontiers of Matter'', June 27-July 3, 1999, France
| null | null |
RAL-TR-1999-067
|
hep-ph
| null |
We study neutral and charged Higgs boson production in association with stop
and sbottom squarks at the Large Hadron Collider (LHC), within the so-called
M-SUGRA scenario, i.e., the Supergravity (SUGRA) inspired Minimal
Supersymmetric Standard Model (MSSM). For low values of \tan\beta only the
cases \tilde{t}_1\tilde{t}_1^* H, \tilde{t}_1\tilde{t}_1^* h and
\tilde{t}_1\tilde{t}_2^* h give detectable rates while for \tan\beta greater
than 30 a variety of signals involving all Higgs bosons can be accessed, at
high collider luminosity. The dependence of these reactions on the M-SUGRA
parameters might further allow one to pin down the actual structure of the
underlying Supersymmetric (SUSY) model.
|
[
{
"created": "Tue, 28 Sep 1999 10:07:48 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Dedes",
"A.",
"",
"Rutherford Appleton Lab."
],
[
"Moretti",
"S.",
"",
"Rutherford Appleton Lab."
]
] |
We study neutral and charged Higgs boson production in association with stop and sbottom squarks at the Large Hadron Collider (LHC), within the so-called M-SUGRA scenario, i.e., the Supergravity (SUGRA) inspired Minimal Supersymmetric Standard Model (MSSM). For low values of \tan\beta only the cases \tilde{t}_1\tilde{t}_1^* H, \tilde{t}_1\tilde{t}_1^* h and \tilde{t}_1\tilde{t}_2^* h give detectable rates while for \tan\beta greater than 30 a variety of signals involving all Higgs bosons can be accessed, at high collider luminosity. The dependence of these reactions on the M-SUGRA parameters might further allow one to pin down the actual structure of the underlying Supersymmetric (SUSY) model.
|
1610.10081
|
Rome Samanta
|
Rome Samanta, Mainak Chakraborty, Probir Roy and Ambar Ghosal
|
Baryon asymmetry via leptogenesis in a neutrino mass model with complex
scaling
|
17 pages, 19 figures, effect of $N_2$ leptogenesis is added in Sec.
6, version to appear in JCAP
| null |
10.1088/1475-7516/2017/03/025
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Baryogenesis via leptogenesis is investigated in a specific model of light
neutrino masses and mixing angles. The latter was proposed on the basis of an
assumed complex-extended scaling property of the neutrino Majorana mass matrix
$M_\nu$, derived with a type-1 seesaw from a Dirac mass matrix $m_D$ and a
heavy singlet neutrino Majorana mass matrix $M_R$. One of its important
features, highlighted here, is that there is a common source of the origin of a
nonzero $\theta_{13}$ and the CP violating lepton asymmetry through the
imaginary part of $m_D$. The model predicted CP violation to be maximal for the
Dirac type and vanishing for the Majorana type. We assume strongly hierarchical
mass eigenvalues for $M_R$. The leptonic CP asymmetry parameter
$\varepsilon^\alpha_{1}\hspace{1mm}$ with lepton flavor $\alpha$, originating
from the decays of the lightest of the heavy neutrinos $N_1$ (of mass $M_1$) at
a temperature $T\sim M_1$, is what matters here with
$\varepsilon^\alpha_{2,3}$, originating from the decays of $N_{2,3}$, being
washed out. The light leptonic and heavy neutrino number densities (normalized
to the entropy density) are evolved via Boltzmann equations down to electroweak
temperatures to yield a baryon asymmetry through sphaleronic transitions. The
effect of flavored vs. unflavored leptogenesis in the three mass regimes (1)
$M_1<10^{9}$ GeV, (2) $10^9$ GeV $<M_1<$ $10^{12}$ GeV and (3) $M_1>10^{12}$
GeV are numerically worked out for both a normal and an inverted mass ordering
of the light neutrinos. Corresponding results on the baryon asymmetry of the
universe are obtained, displayed and discussed.
|
[
{
"created": "Mon, 31 Oct 2016 19:36:24 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Mar 2017 11:23:07 GMT",
"version": "v2"
}
] |
2017-03-22
|
[
[
"Samanta",
"Rome",
""
],
[
"Chakraborty",
"Mainak",
""
],
[
"Roy",
"Probir",
""
],
[
"Ghosal",
"Ambar",
""
]
] |
Baryogenesis via leptogenesis is investigated in a specific model of light neutrino masses and mixing angles. The latter was proposed on the basis of an assumed complex-extended scaling property of the neutrino Majorana mass matrix $M_\nu$, derived with a type-1 seesaw from a Dirac mass matrix $m_D$ and a heavy singlet neutrino Majorana mass matrix $M_R$. One of its important features, highlighted here, is that there is a common source of the origin of a nonzero $\theta_{13}$ and the CP violating lepton asymmetry through the imaginary part of $m_D$. The model predicted CP violation to be maximal for the Dirac type and vanishing for the Majorana type. We assume strongly hierarchical mass eigenvalues for $M_R$. The leptonic CP asymmetry parameter $\varepsilon^\alpha_{1}\hspace{1mm}$ with lepton flavor $\alpha$, originating from the decays of the lightest of the heavy neutrinos $N_1$ (of mass $M_1$) at a temperature $T\sim M_1$, is what matters here with $\varepsilon^\alpha_{2,3}$, originating from the decays of $N_{2,3}$, being washed out. The light leptonic and heavy neutrino number densities (normalized to the entropy density) are evolved via Boltzmann equations down to electroweak temperatures to yield a baryon asymmetry through sphaleronic transitions. The effect of flavored vs. unflavored leptogenesis in the three mass regimes (1) $M_1<10^{9}$ GeV, (2) $10^9$ GeV $<M_1<$ $10^{12}$ GeV and (3) $M_1>10^{12}$ GeV are numerically worked out for both a normal and an inverted mass ordering of the light neutrinos. Corresponding results on the baryon asymmetry of the universe are obtained, displayed and discussed.
|
2308.00027
|
Jona Ackerschott
|
Jona Ackerschott, Rahool Kumar Barman, Dorival Gon\c{c}alves, Theo
Heimel, Tilman Plehn
|
Returning CP-Observables to The Frames They Belong
|
25 pages, 7 figures
|
SciPost Phys. 17, 001 (2024)
|
10.21468/SciPostPhys.17.1.001
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Optimal kinematic observables are often defined in specific frames and then
approximated at the reconstruction level. We show how multi-dimensional
unfolding methods allow us to reconstruct these observables in their proper
rest frame and in a probabilistically faithful way. We illustrate our approach
with a measurement of a CP-phase in the top Yukawa coupling. Our method makes
use of key advantages of generative unfolding, but as a constructed observable
it fits into standard LHC analysis frameworks.
|
[
{
"created": "Mon, 31 Jul 2023 18:00:01 GMT",
"version": "v1"
}
] |
2024-07-03
|
[
[
"Ackerschott",
"Jona",
""
],
[
"Barman",
"Rahool Kumar",
""
],
[
"Gonçalves",
"Dorival",
""
],
[
"Heimel",
"Theo",
""
],
[
"Plehn",
"Tilman",
""
]
] |
Optimal kinematic observables are often defined in specific frames and then approximated at the reconstruction level. We show how multi-dimensional unfolding methods allow us to reconstruct these observables in their proper rest frame and in a probabilistically faithful way. We illustrate our approach with a measurement of a CP-phase in the top Yukawa coupling. Our method makes use of key advantages of generative unfolding, but as a constructed observable it fits into standard LHC analysis frameworks.
|
2403.02916
|
Francesco Rosini
|
Francesco Rosini, Simone Pacetti, Olga Shekhovtsova, Egle
Tomasi-Gustafsson
|
Microscopic parametrization of the near threshold oscillations of the
nucleon time-like effective electromagnetic form factors
|
8 pages, 4 figures
|
Eur. Phys. J. A 60, 144 (2024)
|
10.1140/epja/s10050-024-01365-9
| null |
hep-ph hep-ex nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
We present an analysis of the recent near threshold BESIII data for the
nucleon time-like effective form factors. The damped oscillation emerging from
the subtraction of the dipole formula is treated in non-perturbative-QCD,
making use of the light cone distribution amplitudes expansion.
Non-perturbative effects are accounted for by considering Q2-dependent
coefficients in such expansions, whose free parameters are determined by
fitting to the proton and neutron data. Possible implications and future
analysis have been discussed.
|
[
{
"created": "Tue, 5 Mar 2024 12:34:29 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jun 2024 14:53:08 GMT",
"version": "v2"
}
] |
2024-07-12
|
[
[
"Rosini",
"Francesco",
""
],
[
"Pacetti",
"Simone",
""
],
[
"Shekhovtsova",
"Olga",
""
],
[
"Tomasi-Gustafsson",
"Egle",
""
]
] |
We present an analysis of the recent near threshold BESIII data for the nucleon time-like effective form factors. The damped oscillation emerging from the subtraction of the dipole formula is treated in non-perturbative-QCD, making use of the light cone distribution amplitudes expansion. Non-perturbative effects are accounted for by considering Q2-dependent coefficients in such expansions, whose free parameters are determined by fitting to the proton and neutron data. Possible implications and future analysis have been discussed.
|
1006.5950
|
Alexander Isayev
|
A. A. Isayev
|
Phenomenology of Heavy Flavors in Ultrarelativistic Heavy-Ion Collisions
|
Based on the lecture given at the Xth International School-Seminar
"The Actual Problems of Microworld Physics", Gomel, Belarus, July 15 - 26,
2009
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Some recent experimental results obtained in collisions of heavy nuclei
($\sqrt{s}=200$ GeV) at BNL Relativistic Heavy-Ion Collider (RHIC) are
discussed. The probes of dense matter created in heavy-ion collision by
quarkonia, $D$ and $B$ mesons containing heavy charm and beauty quarks are
considered. The centrality, rapidity and transverse momentum dependences of the
nuclear modification factor and elliptic flow coefficient are presented and
their possible theoretical interpretation is provided.
|
[
{
"created": "Wed, 30 Jun 2010 18:54:44 GMT",
"version": "v1"
}
] |
2010-07-01
|
[
[
"Isayev",
"A. A.",
""
]
] |
Some recent experimental results obtained in collisions of heavy nuclei ($\sqrt{s}=200$ GeV) at BNL Relativistic Heavy-Ion Collider (RHIC) are discussed. The probes of dense matter created in heavy-ion collision by quarkonia, $D$ and $B$ mesons containing heavy charm and beauty quarks are considered. The centrality, rapidity and transverse momentum dependences of the nuclear modification factor and elliptic flow coefficient are presented and their possible theoretical interpretation is provided.
|
1903.10844
|
Christian Fischer
|
Gernot Eichmann, Christian S. Fischer, Esther Weil, Richard Williams
|
Single pseudoscalar meson pole and pion box contributions to the
anomalous magnetic moment of the muon
|
11 pages, 9 figures; v2: minor changes, diagram added, improved value
for pion-box; version published in PLB
| null |
10.1016/j.physletb.2019.134855
| null |
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present results for single pseudoscalar meson pole contributions and pion
box contributions to the hadronic light-by-light (LBL) correction of the muon's
anomalous magnetic moment. We follow the recently developed dispersive approach
to LBL, where these contributions are evaluated with intermediate mesons
on-shell. However, the space-like electromagnetic and transition form factors
are not determined from analytic continuation of time-like data, but directly
calculated within the functional approach to QCD using Dyson-Schwinger and
Bethe-Salpeter equations. This strategy allows for a systematic comparison with
a strictly dispersive treatment and also with recent results from lattice QCD.
Within error bars, we obtain excellent agreement for the pion electromagnetic
and transition form factor and the resulting contributions to LBL. In addition,
we present results for the $\eta$ and $\eta'$ pole contributions and discuss
the dynamical effects in the $\eta-\eta'$ mixing due to the strange quarks. Our
result for the total pseudoscalar pole contributions is $a_\mu^{\text{PS-pole}}
= 91.6 \,(1.9) \times 10^{-11}$ and for the pion-box contribution we obtain
$a_\mu^{\pi-\text{box}} = -16.3 \,(2)(4) \times 10^{-11}$.
|
[
{
"created": "Tue, 26 Mar 2019 12:58:06 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Oct 2019 09:03:30 GMT",
"version": "v2"
}
] |
2019-10-14
|
[
[
"Eichmann",
"Gernot",
""
],
[
"Fischer",
"Christian S.",
""
],
[
"Weil",
"Esther",
""
],
[
"Williams",
"Richard",
""
]
] |
We present results for single pseudoscalar meson pole contributions and pion box contributions to the hadronic light-by-light (LBL) correction of the muon's anomalous magnetic moment. We follow the recently developed dispersive approach to LBL, where these contributions are evaluated with intermediate mesons on-shell. However, the space-like electromagnetic and transition form factors are not determined from analytic continuation of time-like data, but directly calculated within the functional approach to QCD using Dyson-Schwinger and Bethe-Salpeter equations. This strategy allows for a systematic comparison with a strictly dispersive treatment and also with recent results from lattice QCD. Within error bars, we obtain excellent agreement for the pion electromagnetic and transition form factor and the resulting contributions to LBL. In addition, we present results for the $\eta$ and $\eta'$ pole contributions and discuss the dynamical effects in the $\eta-\eta'$ mixing due to the strange quarks. Our result for the total pseudoscalar pole contributions is $a_\mu^{\text{PS-pole}} = 91.6 \,(1.9) \times 10^{-11}$ and for the pion-box contribution we obtain $a_\mu^{\pi-\text{box}} = -16.3 \,(2)(4) \times 10^{-11}$.
|
2105.10279
|
Hyun-Chul Kim
|
June-Young Kim and Hyun-Chul Kim
|
Energy-momentum tensor of the nucleon on the light front: Abel
tomography case
|
10 pages and 5 figures
| null |
10.1103/PhysRevD.104.074019
|
INHA-NTG-04/2021
|
hep-ph hep-ex hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the two-dimensional energy-momentum-tensor (EMT) distributions
of the nucleon on the light front, using the Abel transforms of the
three-dimensional EMT ones. We explicitly show that the main features of all
EMT distributions are kept intact in the course of the Abel transform. We also
examine the equivalence between the global and local conditions for the nucleon
stability in the three-dimensional Breit frame and in the two-dimensional
transverse plane on the light front. We also discuss the two-dimensional force
fields inside a nucleon on the light front.
|
[
{
"created": "Fri, 21 May 2021 11:05:39 GMT",
"version": "v1"
}
] |
2021-10-27
|
[
[
"Kim",
"June-Young",
""
],
[
"Kim",
"Hyun-Chul",
""
]
] |
We investigate the two-dimensional energy-momentum-tensor (EMT) distributions of the nucleon on the light front, using the Abel transforms of the three-dimensional EMT ones. We explicitly show that the main features of all EMT distributions are kept intact in the course of the Abel transform. We also examine the equivalence between the global and local conditions for the nucleon stability in the three-dimensional Breit frame and in the two-dimensional transverse plane on the light front. We also discuss the two-dimensional force fields inside a nucleon on the light front.
|
2003.02988
|
Hong-Shi Zong
|
Zu-Qing Wu, Chao-Shi, Jia-Lun Ping, Hong-Shi Zong
|
The contributions of the vector-channel at finite isospin chemical
potential with the self-consistent mean field approximation
|
6 figures, 10 pages
|
Phys. Rev. D 101, 074008 (2020)
|
10.1103/PhysRevD.101.074008
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The self-consistent mean field approximation of two-flavor NJL model, which
introduces a free parameter $\alpha$ ($\alpha$ reflects the weight of different
interaction channels), is employed to investigate the contributions of the
vector-channel at finite isospin chemical potential $\mu_I$ and zero baryon
chemical potential $\mu_B$ and zero temperature $T$. The calculations show that
the consideration of the vector-channel contributions leads to lower value of
pion condensate in superfluid phase, compared with the standard Lagrangian of
NJL model ($\alpha=0$). In superfluid phase, we also obtain lower isospin
number density, and the discrepancy is getting larger with the increase of
isospin potential. Compared with the recent results from Lattice QCD, the
isospin density and energy density we obtained with $\alpha=0.5$ agree with the
data of lattice well. In the phase diagram in the $T-\mu_I$ plane for
$\mu_B=0$, we can see that the difference of the critical temperatures of phase
transition between the results with $\alpha=0$ and $\alpha=0.5$ is up to
$3\%-5\%$ for a fixed isospin potential. All of these indicate that the vector
channels play an important role in isospin medium.
|
[
{
"created": "Fri, 6 Mar 2020 01:28:26 GMT",
"version": "v1"
}
] |
2020-04-15
|
[
[
"Wu",
"Zu-Qing",
""
],
[
"Chao-Shi",
"",
""
],
[
"Ping",
"Jia-Lun",
""
],
[
"Zong",
"Hong-Shi",
""
]
] |
The self-consistent mean field approximation of two-flavor NJL model, which introduces a free parameter $\alpha$ ($\alpha$ reflects the weight of different interaction channels), is employed to investigate the contributions of the vector-channel at finite isospin chemical potential $\mu_I$ and zero baryon chemical potential $\mu_B$ and zero temperature $T$. The calculations show that the consideration of the vector-channel contributions leads to lower value of pion condensate in superfluid phase, compared with the standard Lagrangian of NJL model ($\alpha=0$). In superfluid phase, we also obtain lower isospin number density, and the discrepancy is getting larger with the increase of isospin potential. Compared with the recent results from Lattice QCD, the isospin density and energy density we obtained with $\alpha=0.5$ agree with the data of lattice well. In the phase diagram in the $T-\mu_I$ plane for $\mu_B=0$, we can see that the difference of the critical temperatures of phase transition between the results with $\alpha=0$ and $\alpha=0.5$ is up to $3\%-5\%$ for a fixed isospin potential. All of these indicate that the vector channels play an important role in isospin medium.
|
1701.04597
|
Yueling Yang
|
Junfeng Sun, Yueling Yang, Qingxia Li, Haiyan Li, Qin Chang, Jinshu
Huang
|
The ${\Upsilon}(nS)$ ${\to}$ $B_{c}D_{s}$, $B_{c}D_{d}$ decays with
perturbative QCD approach
|
18 pages, 2 figures. arXiv admin note: text overlap with
arXiv:1604.07040
|
Physics Letters B 752, 322-328 (2016)
|
10.1016/j.physletb.2015.11.053
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
The ${\Upsilon}(nS)$ ${\to}$ $B_{c}D_{s}$, $B_{c}D_{d}$ weak decays are
studied with the pQCD approach firstly. It is found that branching ratios
${\cal B}r({\Upsilon}(nS){\to}B_{c}D_{s})$ ${\sim}$ ${\cal O}(10^{-10})$ and
${\cal B}r({\Upsilon}(nS){\to}B_{c}D_{d})$ ${\sim}$ ${\cal O}(10^{-11})$, which
might be measurable in the future experiments.
|
[
{
"created": "Tue, 17 Jan 2017 09:50:49 GMT",
"version": "v1"
}
] |
2017-02-12
|
[
[
"Sun",
"Junfeng",
""
],
[
"Yang",
"Yueling",
""
],
[
"Li",
"Qingxia",
""
],
[
"Li",
"Haiyan",
""
],
[
"Chang",
"Qin",
""
],
[
"Huang",
"Jinshu",
""
]
] |
The ${\Upsilon}(nS)$ ${\to}$ $B_{c}D_{s}$, $B_{c}D_{d}$ weak decays are studied with the pQCD approach firstly. It is found that branching ratios ${\cal B}r({\Upsilon}(nS){\to}B_{c}D_{s})$ ${\sim}$ ${\cal O}(10^{-10})$ and ${\cal B}r({\Upsilon}(nS){\to}B_{c}D_{d})$ ${\sim}$ ${\cal O}(10^{-11})$, which might be measurable in the future experiments.
|
hep-ph/9807453
|
Bugra Borasoy
|
B. Borasoy
|
Sigma-terms in heavy baryon chiral perturbation theory revisited
|
17 pages
|
Eur.Phys.J.C8:121-130,1999
|
10.1007/s100520050451
| null |
hep-ph
| null |
The $\sigma$-terms are calculated at next-to-leading order in heavy baryon
chiral perturbation theory by employing a cutoff regularization. The results do
not depend on the cutoff value to the order we are working . The baryon masses
and $\sigma_{\pi N}(0)$ are used to perform a least-squares fit to the three
appearing low-energy constants and predictions for the two $KN$ $\sigma$-terms
and the strange contribution to the nucleon mass are made. The lack of
convergence in the chiral expansions of these quantities when regularized
dimensionally is overcome in the cutoff scheme. The $\sigma$-term shifts to the
pertinent Cheng-Dashen points are calculated. We also include the spin-3/2
decuplet in the effective theory.
|
[
{
"created": "Tue, 21 Jul 1998 18:31:29 GMT",
"version": "v1"
}
] |
2011-09-13
|
[
[
"Borasoy",
"B.",
""
]
] |
The $\sigma$-terms are calculated at next-to-leading order in heavy baryon chiral perturbation theory by employing a cutoff regularization. The results do not depend on the cutoff value to the order we are working . The baryon masses and $\sigma_{\pi N}(0)$ are used to perform a least-squares fit to the three appearing low-energy constants and predictions for the two $KN$ $\sigma$-terms and the strange contribution to the nucleon mass are made. The lack of convergence in the chiral expansions of these quantities when regularized dimensionally is overcome in the cutoff scheme. The $\sigma$-term shifts to the pertinent Cheng-Dashen points are calculated. We also include the spin-3/2 decuplet in the effective theory.
|
hep-ph/9702334
|
Tao Han
|
V. Barger, M.S. Berger, J.F. Gunion and T. Han
|
Precision W-boson and top-quark mass determinations at a muon collider
|
27 pages, 11 figures, postscript file available via anonymous
ftp://ucdhep.ucdavis.edu/han/mumu/mwmt.ps
|
Phys.Rev.D56:1714-1722,1997
|
10.1103/PhysRevD.56.1714
|
MADPH-96-963, IUHET-346, UCD-97-01
|
hep-ph hep-ex
| null |
Precise determinations of the masses of the $W$ boson and of the top quark
could stringently test the radiative structure of the Standard Model (SM) or
provide evidence for new physics. We analyze the excellent prospects at a muon
collider for measuring $M_W$ and $m_t$ in the $W^+W^-$ and $t\bar t$ threshold
regions. With an integrated luminosity of 10 (100) fb$^{-1}$, the $W$-boson
mass could be measured to a precision of 20 (6) MeV, and the top-quark mass to
a precision of 200 (70) MeV, provided that theoretical and experimental
systematics are understood. A measurement of $\Delta m_t=200$ MeV for fixed
$M_W$ would constrain a 100 GeV SM Higgs mass within about $\pm 2$ GeV, while
$\Delta M_W=6$ MeV for fixed $m_t$ would constrain $m_h$ to about $\pm 10$ GeV.
|
[
{
"created": "Fri, 14 Feb 1997 05:31:39 GMT",
"version": "v1"
}
] |
2009-09-15
|
[
[
"Barger",
"V.",
""
],
[
"Berger",
"M. S.",
""
],
[
"Gunion",
"J. F.",
""
],
[
"Han",
"T.",
""
]
] |
Precise determinations of the masses of the $W$ boson and of the top quark could stringently test the radiative structure of the Standard Model (SM) or provide evidence for new physics. We analyze the excellent prospects at a muon collider for measuring $M_W$ and $m_t$ in the $W^+W^-$ and $t\bar t$ threshold regions. With an integrated luminosity of 10 (100) fb$^{-1}$, the $W$-boson mass could be measured to a precision of 20 (6) MeV, and the top-quark mass to a precision of 200 (70) MeV, provided that theoretical and experimental systematics are understood. A measurement of $\Delta m_t=200$ MeV for fixed $M_W$ would constrain a 100 GeV SM Higgs mass within about $\pm 2$ GeV, while $\Delta M_W=6$ MeV for fixed $m_t$ would constrain $m_h$ to about $\pm 10$ GeV.
|
hep-ph/9703452
|
Manuel Drees
|
Abdelhak Djouadi (LPM, Montpellier, France) and Manuel Drees (APCTP,
Seoul, Korea)
|
Higgs Boson Decays into Light Gravitinos
|
11 pages, 4 embedded figures; LaTeX with equation.sty and epsf.sty
|
Phys.Lett. B407 (1997) 243-249
|
10.1016/S0370-2693(97)00670-9
|
APCTP 97-05, PM 97-05
|
hep-ph
| null |
We study decays of the neutral and charged Higgs bosons of the minimal
supersymmetric standard model into a very light gravitino and a neutralino or
chargino. Present experimental constraints already imply that the lighter
scalar Higgs boson can only have a very small branching ratio into this mode.
However, if the gravitino mass is below $\sim 0.5$ eV, the heavier neutral and
charged Higgs boson decays into a gravitino can be important or even dominant.
We discuss the resulting signature for associate production of the heavy
CP-even and the CP-odd states at future $e^+ e^-$ colliders, and comment on
Higgs boson production at hadron colliders.
|
[
{
"created": "Sat, 29 Mar 1997 05:58:35 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Djouadi",
"Abdelhak",
"",
"LPM, Montpellier, France"
],
[
"Drees",
"Manuel",
"",
"APCTP,\n Seoul, Korea"
]
] |
We study decays of the neutral and charged Higgs bosons of the minimal supersymmetric standard model into a very light gravitino and a neutralino or chargino. Present experimental constraints already imply that the lighter scalar Higgs boson can only have a very small branching ratio into this mode. However, if the gravitino mass is below $\sim 0.5$ eV, the heavier neutral and charged Higgs boson decays into a gravitino can be important or even dominant. We discuss the resulting signature for associate production of the heavy CP-even and the CP-odd states at future $e^+ e^-$ colliders, and comment on Higgs boson production at hadron colliders.
|
1901.00151
|
Dmitry V. Naumov
|
Dmitry V.Naumov
|
Sterile Neutrino. A short introduction
|
contribution to VLVnT2018 Conference
| null |
10.1051/epjconf/201920704004
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This is a pedagogical introduction to the main concepts of the sterile
neutrino - a hypothetical particle, coined to resolve some anomalies in
neutrino data and retain consistency with observed widths of the $W$ and $Z$
bosons. We briefly review existing anomalies and the oscillation parameters
that best describe these data. We discuss in more detail how sterile neutrino
can be observed, as well as the consequences of its possible existence. In
particular, we pay attention to a possible loss of coherence in a model of
neutrino oscillations with sterile neutrinos, where this effect might be of a
major importance with respect to the 3$\nu$ model. The current status of
searches for a sterile neutrino state is also briefly reviewed.
|
[
{
"created": "Tue, 1 Jan 2019 13:10:21 GMT",
"version": "v1"
}
] |
2019-05-22
|
[
[
"Naumov",
"Dmitry V.",
""
]
] |
This is a pedagogical introduction to the main concepts of the sterile neutrino - a hypothetical particle, coined to resolve some anomalies in neutrino data and retain consistency with observed widths of the $W$ and $Z$ bosons. We briefly review existing anomalies and the oscillation parameters that best describe these data. We discuss in more detail how sterile neutrino can be observed, as well as the consequences of its possible existence. In particular, we pay attention to a possible loss of coherence in a model of neutrino oscillations with sterile neutrinos, where this effect might be of a major importance with respect to the 3$\nu$ model. The current status of searches for a sterile neutrino state is also briefly reviewed.
|
hep-ph/9409254
|
Jean-Bruno Erismann
|
J. Soffer
|
Positivity Constraints for Spin-Dependent Parton Distributions
|
8 pages,CPT-94/P.3059,LaTex,3 fig available on cpt.univ-mrs.fr
directory pub/preprints/94/fundamental-interactions/94-P.3059
|
Phys.Rev.Lett.74:1292-1294,1995
|
10.1103/PhysRevLett.74.1292
| null |
hep-ph
| null |
We derive new positivity constraints on the spin-dependent structure
functions of the nucleon. These model independent results reduce conside\-rably
their domain of allowed values, in particular for the chiral-odd parton
distribution $h_1 (x)$.
|
[
{
"created": "Thu, 8 Sep 1994 08:44:47 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Oct 1994 08:14:45 GMT",
"version": "v2"
}
] |
2010-11-01
|
[
[
"Soffer",
"J.",
""
]
] |
We derive new positivity constraints on the spin-dependent structure functions of the nucleon. These model independent results reduce conside\-rably their domain of allowed values, in particular for the chiral-odd parton distribution $h_1 (x)$.
|
2406.16504
|
Luis Roca
|
E. Oset, L. Roca, M. Whitehead
|
Production of pentaquarks with hidden charm and double strangeness in
$\Xi_b$ and $\Omega_b$ decays
|
9 pages, 7 figures
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Recently, several pentaquark states $P_{css}$, with global flavor $\bar c c s
s n$, have been predicted within a theoretical framework based on unitary
coupled channels. We study theoretically the feasibility to observe the
$P_{css}$ with $I(J^P)=\frac{1}{2}(\frac{1}{2}^-)$ in the decays $\Xi_b^0\to
\eta \eta_c \Xi^0$ and $\Omega_b^-\to K^- \eta_c \Xi^0$. Indeed, within the
model, the $\eta_c \Xi^0$ channel is the lowest mass pseudoscalar-baryon
channel to which this pentaquark state couples, thus we can expect to observe
its signal in the $\eta_c \Xi^0$ invariant mass distribution of the mentioned
decays. We identify the dominant weak decay processes and then implement the
hadronization into the different meson-baryon channels in the final state,
linked by flavor symmetry. The dominant meson-baryon final state interaction is
then implemented to generate the full amplitude, implicitly accounting for the
dynamical emergence of the pentaquark states. We obtain a clear
Breit-Wigner-like resonant signal in the spectrum of the $\Omega_b^-$ decay,
exceeding that in the $\Xi_b^0$ decay by two to three orders of magnitude. In
the case of the latter decay, the resonant state would manifest as a
significant dip in the spectrum. We study the feasibility of searching for
these $b$-hadron decay modes and analysing their resonant components using the
current and future data samples from the LHCb experiment.
|
[
{
"created": "Mon, 24 Jun 2024 10:17:04 GMT",
"version": "v1"
}
] |
2024-06-25
|
[
[
"Oset",
"E.",
""
],
[
"Roca",
"L.",
""
],
[
"Whitehead",
"M.",
""
]
] |
Recently, several pentaquark states $P_{css}$, with global flavor $\bar c c s s n$, have been predicted within a theoretical framework based on unitary coupled channels. We study theoretically the feasibility to observe the $P_{css}$ with $I(J^P)=\frac{1}{2}(\frac{1}{2}^-)$ in the decays $\Xi_b^0\to \eta \eta_c \Xi^0$ and $\Omega_b^-\to K^- \eta_c \Xi^0$. Indeed, within the model, the $\eta_c \Xi^0$ channel is the lowest mass pseudoscalar-baryon channel to which this pentaquark state couples, thus we can expect to observe its signal in the $\eta_c \Xi^0$ invariant mass distribution of the mentioned decays. We identify the dominant weak decay processes and then implement the hadronization into the different meson-baryon channels in the final state, linked by flavor symmetry. The dominant meson-baryon final state interaction is then implemented to generate the full amplitude, implicitly accounting for the dynamical emergence of the pentaquark states. We obtain a clear Breit-Wigner-like resonant signal in the spectrum of the $\Omega_b^-$ decay, exceeding that in the $\Xi_b^0$ decay by two to three orders of magnitude. In the case of the latter decay, the resonant state would manifest as a significant dip in the spectrum. We study the feasibility of searching for these $b$-hadron decay modes and analysing their resonant components using the current and future data samples from the LHCb experiment.
|
2211.07071
|
Cheng Zhang
|
Cheng Zhang, Qian-Shun Dai and Ding Yu Shao
|
Azimuthal decorrelation for photon induced dijet production in
ultra-peripheral collisions of heavy ions
|
20 pages, 5 figures
|
J. High Energ. Phys. 2023, 2 (2023)
|
10.1007/JHEP02(2023)002
| null |
hep-ph hep-ex nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
We study the azimuthal angular decorrelation of the dijet production via
photon fusion in ultra-peripheral heavy ion collisions. The impact parameter
dependent cross section of quark-antiquark pairs production is derived using
the equivalent photon approximation, and the contribution from final-state QCD
radiations to the azimuthal angular distribution are calculated within
Soft-Collinear Effective Theory. We carry out the QCD resummation of large
logarithms of the azimuthal angle as well as the jet radius at next-to-leading
logarithmic accuracy. In the end we present the normalized differential cross
section for azimuthal decorrelation of the dijet pair and find that our results
are consistent with the measurements reported by the ATLAS collaboration.
|
[
{
"created": "Mon, 14 Nov 2022 02:29:17 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Feb 2023 04:43:53 GMT",
"version": "v2"
}
] |
2023-02-03
|
[
[
"Zhang",
"Cheng",
""
],
[
"Dai",
"Qian-Shun",
""
],
[
"Shao",
"Ding Yu",
""
]
] |
We study the azimuthal angular decorrelation of the dijet production via photon fusion in ultra-peripheral heavy ion collisions. The impact parameter dependent cross section of quark-antiquark pairs production is derived using the equivalent photon approximation, and the contribution from final-state QCD radiations to the azimuthal angular distribution are calculated within Soft-Collinear Effective Theory. We carry out the QCD resummation of large logarithms of the azimuthal angle as well as the jet radius at next-to-leading logarithmic accuracy. In the end we present the normalized differential cross section for azimuthal decorrelation of the dijet pair and find that our results are consistent with the measurements reported by the ATLAS collaboration.
|
hep-ph/0408198
|
Pankaj Jain
|
Sudeep Das, Pankaj Jain, John P. Ralston and Rajib Saha
|
Probing Light Pseudoscalars with Light: Propagation, Resonance and
Spontaneous Polarization
|
41 pages, 7 figures, revised version
|
JCAP 0506 (2005) 002
|
10.1088/1475-7516/2005/06/002
| null |
hep-ph astro-ph
| null |
Radiation propagating over cosmological distances can probe light weakly
interacting pseudoscalar (or scalar) particles. The existence of a spin-0 field
changes the dynamical symmetries of electrodynamics. It predicts spontaneous
generation of polarization of electromagnetic waves due to mode mixing in the
presence of background magnetic field.We illustrate this by calculations of
propagation in a uniform medium, as well as in a slowly varying background
medium, and finally with resonant mixing. Highly complicated correlations
between different
Stokes parameters are predicted depending on the parameter regimes.
The polarization of propagating waves shows interesting and complex
dependence on frequency, the distance of propagation, coupling constants, and
parameters of the background medium such as the plasma density and the magnetic
field strength. For the first time we study the resonant mixing of
electromagnetic waves with the scalar field, which occurs when the background
plasma frequency becomes equal to the mass of the scalar field at some point
along the path. Dynamical effects are found to be considerably enhanced in this
case. We also formulate the condition under which the adiabatic approximation
can be used consistently, and find caveats about comparing different frequency
regimes.
|
[
{
"created": "Wed, 18 Aug 2004 04:07:15 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Oct 2004 06:43:36 GMT",
"version": "v2"
},
{
"created": "Fri, 27 May 2005 04:49:23 GMT",
"version": "v3"
},
{
"created": "Thu, 9 Aug 2007 09:40:54 GMT",
"version": "v4"
}
] |
2009-11-10
|
[
[
"Das",
"Sudeep",
""
],
[
"Jain",
"Pankaj",
""
],
[
"Ralston",
"John P.",
""
],
[
"Saha",
"Rajib",
""
]
] |
Radiation propagating over cosmological distances can probe light weakly interacting pseudoscalar (or scalar) particles. The existence of a spin-0 field changes the dynamical symmetries of electrodynamics. It predicts spontaneous generation of polarization of electromagnetic waves due to mode mixing in the presence of background magnetic field.We illustrate this by calculations of propagation in a uniform medium, as well as in a slowly varying background medium, and finally with resonant mixing. Highly complicated correlations between different Stokes parameters are predicted depending on the parameter regimes. The polarization of propagating waves shows interesting and complex dependence on frequency, the distance of propagation, coupling constants, and parameters of the background medium such as the plasma density and the magnetic field strength. For the first time we study the resonant mixing of electromagnetic waves with the scalar field, which occurs when the background plasma frequency becomes equal to the mass of the scalar field at some point along the path. Dynamical effects are found to be considerably enhanced in this case. We also formulate the condition under which the adiabatic approximation can be used consistently, and find caveats about comparing different frequency regimes.
|
1805.01904
|
Martin Bauer
|
Martin Bauer, Sascha Diefenbacher, Tilman Plehn, Michael Russell and
Daniel A. Camargo
|
Dark Matter in Anomaly-Free Gauge Extensions
|
25 pages plus appendix, 14 figures
|
SciPost Phys. 5, 036 (2018)
|
10.21468/SciPostPhys.5.4.036
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A consistent model for vector mediators to dark matter needs to be
anomaly-free and include a scalar mode from mass generation. For the leading
U(1) extensions we review the structure and constraints, including kinetic
mixing at loop level. The thermal relic density suggests that the vector and
scalar masses are similar. For the LHC we combine a $Z'$ shape analysis with
mono-jets. For the latter, we find that a shape analysis offers significant
improvement over existing cut-and-count approaches. Direct detection limits
strongly constrain the kinetic mixing angle and we propose a $\ell^+\ell^- E_T$
search strategy based on the scalar mediator.
|
[
{
"created": "Fri, 4 May 2018 18:02:03 GMT",
"version": "v1"
},
{
"created": "Fri, 25 May 2018 13:43:12 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Aug 2018 10:54:40 GMT",
"version": "v3"
}
] |
2018-10-24
|
[
[
"Bauer",
"Martin",
""
],
[
"Diefenbacher",
"Sascha",
""
],
[
"Plehn",
"Tilman",
""
],
[
"Russell",
"Michael",
""
],
[
"Camargo",
"Daniel A.",
""
]
] |
A consistent model for vector mediators to dark matter needs to be anomaly-free and include a scalar mode from mass generation. For the leading U(1) extensions we review the structure and constraints, including kinetic mixing at loop level. The thermal relic density suggests that the vector and scalar masses are similar. For the LHC we combine a $Z'$ shape analysis with mono-jets. For the latter, we find that a shape analysis offers significant improvement over existing cut-and-count approaches. Direct detection limits strongly constrain the kinetic mixing angle and we propose a $\ell^+\ell^- E_T$ search strategy based on the scalar mediator.
|
hep-ph/9504279
|
Fabian Franke
|
F. Franke and H. Fraas
|
Mass Bounds for the Neutral Higgs Bosons in the Next-To-Minimal
Supersymmetric Standard Model
|
9 pages, LATEX, 6 figures (not included). The complete paper
(including figures) can be obtained via anonymous ftp at
ftp://ftp.physik.uni-wuerzburg.de/pub/preprint/WUE-ITP-95-003.ps.gz
|
Phys.Lett. B353 (1995) 234-242
|
10.1016/0370-2693(95)00588-C
|
WUE-ITP-95-003
|
hep-ph
| null |
In the Next--To--Minimal Supersymmetric Standard Model (NMSSM), the Higgs and
neutralino/chargino sectors are strongly correlated by four common parameters
at tree level. Therefore we analyze the experimental data from both the search
for Higgs bosons as well as for neutralinos and charginos at LEP 100 in order
to constrain the parameter space and the masses of the neutral Higgs particles
in the NMSSM. We find that small singlet vacuum expectation values are ruled
out, but a massless neutral Higgs scalar and pseudoscalar is not excluded for
most of the parameter space of the NMSSM. Improved limits from the
neutralino/chargino search at LEP 200, however, may lead to nonvanishing lower
Higgs mass bounds.
|
[
{
"created": "Tue, 11 Apr 1995 12:25:09 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Franke",
"F.",
""
],
[
"Fraas",
"H.",
""
]
] |
In the Next--To--Minimal Supersymmetric Standard Model (NMSSM), the Higgs and neutralino/chargino sectors are strongly correlated by four common parameters at tree level. Therefore we analyze the experimental data from both the search for Higgs bosons as well as for neutralinos and charginos at LEP 100 in order to constrain the parameter space and the masses of the neutral Higgs particles in the NMSSM. We find that small singlet vacuum expectation values are ruled out, but a massless neutral Higgs scalar and pseudoscalar is not excluded for most of the parameter space of the NMSSM. Improved limits from the neutralino/chargino search at LEP 200, however, may lead to nonvanishing lower Higgs mass bounds.
|
1407.5956
|
A. H. Rezaeian
|
Amir H. Rezaeian
|
b-CGC versus IP-Sat and high precision combined HERA data
|
7 pages, 10 figures. To appear in proceedings of DIS 2014, XXII.
International Workshop on Deep-Inelastic Scattering and Related Subjects, 28
April - 2 May 2014, Warsaw, Poland
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Impact-Parameter dependent Color Glass Condensate (b-CGC) and Saturation
(IP-Sat) dipole models incorporate key features of small-x physics properties
and match smoothly to the perturbative QCD regime at large $Q^2$ for a given
$x$. Although both models include saturation effects and depend on
impact-parameter, the former is based on the non-linear BK equation, while the
latter is based on DGLAP evolution. After confronting the models to the
recently released high precision combined HERA data, we show that in both
models, the typical impact-parameter probed in the total $\gamma^{*}p$
cross-section is about $b\approx 2\div 3\,\text{GeV}^{-1}$ and the proton
saturation scale is $Q_S<1$ GeV in HERA kinematics. We show that most features
of inclusive DIS and exclusive diffractive data at HERA are correctly
reproduced in both models. Nevertheless, the b-CGC and the IP-Sat models give
significantly different predictions beyond the current HERA kinematics for the
structure functions at very low x and high virtualities $Q^2$, and for the
exclusive diffractive vector meson and DVCS production at high $t$.
|
[
{
"created": "Tue, 22 Jul 2014 17:43:30 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Jul 2014 18:51:25 GMT",
"version": "v2"
}
] |
2014-07-24
|
[
[
"Rezaeian",
"Amir H.",
""
]
] |
The Impact-Parameter dependent Color Glass Condensate (b-CGC) and Saturation (IP-Sat) dipole models incorporate key features of small-x physics properties and match smoothly to the perturbative QCD regime at large $Q^2$ for a given $x$. Although both models include saturation effects and depend on impact-parameter, the former is based on the non-linear BK equation, while the latter is based on DGLAP evolution. After confronting the models to the recently released high precision combined HERA data, we show that in both models, the typical impact-parameter probed in the total $\gamma^{*}p$ cross-section is about $b\approx 2\div 3\,\text{GeV}^{-1}$ and the proton saturation scale is $Q_S<1$ GeV in HERA kinematics. We show that most features of inclusive DIS and exclusive diffractive data at HERA are correctly reproduced in both models. Nevertheless, the b-CGC and the IP-Sat models give significantly different predictions beyond the current HERA kinematics for the structure functions at very low x and high virtualities $Q^2$, and for the exclusive diffractive vector meson and DVCS production at high $t$.
|
1003.1798
|
Douglas Gingrich Mr.
|
Douglas M. Gingrich
|
Noncommutative geometry inspired black holes in higher dimensions at the
LHC
|
21 pages, 7 figures
|
JHEP 1005:022,2010
|
10.1007/JHEP05(2010)022
| null |
hep-ph gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
When embedding models of noncommutative geometry inspired black holes into
the peridium of large extra dimensions, it is natural to relate the
noncommutativity scale to the higher-dimensional Planck scale. If the Planck
scale is of the order of a TeV, noncommutative geometry inspired black holes
could become accessible to experiments. In this paper, we present a detailed
phenomenological study of the production and decay of these black holes at the
Large Hadron Collider (LHC). Noncommutative inspired black holes are relatively
cold and can be well described by the microcanonical ensemble during their
entire decay. One of the main consequences of the model is the existence of a
black hole remnant. The mass of the black hole remnant increases with
decreasing mass scale associated with noncommutative and decreasing number of
dimensions. The experimental signatures could be quite different from previous
studies of black holes and remnants at the LHC since the mass of the remnant
could be well above the Planck scale. Although the black hole remnant can be
very heavy, and perhaps even charged, it could result in very little activity
in the central detectors of the LHC experiments, when compared to the usual
anticipated black hole signatures. If this type of noncommutative inspired
black hole can be produced and detected, it would result in an additional mass
threshold above the Planck scale at which new physics occurs.
|
[
{
"created": "Tue, 9 Mar 2010 06:53:20 GMT",
"version": "v1"
}
] |
2014-11-20
|
[
[
"Gingrich",
"Douglas M.",
""
]
] |
When embedding models of noncommutative geometry inspired black holes into the peridium of large extra dimensions, it is natural to relate the noncommutativity scale to the higher-dimensional Planck scale. If the Planck scale is of the order of a TeV, noncommutative geometry inspired black holes could become accessible to experiments. In this paper, we present a detailed phenomenological study of the production and decay of these black holes at the Large Hadron Collider (LHC). Noncommutative inspired black holes are relatively cold and can be well described by the microcanonical ensemble during their entire decay. One of the main consequences of the model is the existence of a black hole remnant. The mass of the black hole remnant increases with decreasing mass scale associated with noncommutative and decreasing number of dimensions. The experimental signatures could be quite different from previous studies of black holes and remnants at the LHC since the mass of the remnant could be well above the Planck scale. Although the black hole remnant can be very heavy, and perhaps even charged, it could result in very little activity in the central detectors of the LHC experiments, when compared to the usual anticipated black hole signatures. If this type of noncommutative inspired black hole can be produced and detected, it would result in an additional mass threshold above the Planck scale at which new physics occurs.
|
hep-ph/0504175
|
Philipp Hagler
|
M. Diehl, Ph. Hagler
|
Spin densities in the transverse plane and generalized transversity
distributions
|
23 pages, 6 eps-figures
|
Eur.Phys.J.C44:87-101,2005
|
10.1140/epjc/s2005-02342-6
| null |
hep-ph hep-lat
| null |
We show how generalized quark distributions in the nucleon describe the
density of polarized quarks in the impact parameter plane, both for
longitudinal and transverse polarization of the quark and the nucleon. This
density representation entails positivity bounds including chiral-odd
distributions, which tighten the known bounds in the chiral-even sector. Using
the quark equations of motion, we derive relations between the moments of
chiral-odd generalized parton distributions of twist two and twist three. We
exhibit the analogy between polarized quark distributions in impact parameter
space and transverse momentum dependent distribution functions.
|
[
{
"created": "Wed, 20 Apr 2005 13:08:02 GMT",
"version": "v1"
}
] |
2009-01-07
|
[
[
"Diehl",
"M.",
""
],
[
"Hagler",
"Ph.",
""
]
] |
We show how generalized quark distributions in the nucleon describe the density of polarized quarks in the impact parameter plane, both for longitudinal and transverse polarization of the quark and the nucleon. This density representation entails positivity bounds including chiral-odd distributions, which tighten the known bounds in the chiral-even sector. Using the quark equations of motion, we derive relations between the moments of chiral-odd generalized parton distributions of twist two and twist three. We exhibit the analogy between polarized quark distributions in impact parameter space and transverse momentum dependent distribution functions.
|
hep-ph/0206012
|
Alexei Prokudin
|
V. A. Petrov, E. Predazzi, A. Prokudin
|
Coulomb Interference in High-Energy pp and pbar p Scattering
|
20 pages, 16 figures
|
Eur.Phys.J.C28:525-533,2003
|
10.1140/epjc/s2003-01191-7
| null |
hep-ph
| null |
An analysis of the Coulombic amplitude and its interference with the nuclear
amplitude which is driven by the three-component Pomeron is presented. It is
shown that different approaches towards the Coulomb phase evaluation give
approximately uniform result at all energies and the difference is negligible
at RHIC and LHC energies. We show that the use of the amplitude which was
fitted to accomodate nucleon data only (in the region 0.01 < |t| < 14.5
(GeV^2)) combined with the Coulomb amplitude, reproduces the existing data in
the Coulomb interference domain quite accurately without any adjustement of the
parameters. As a consequence, we predict the differential cross section in the
region of the Coulomb nucleon interference for both RHIC and LHC energies.
|
[
{
"created": "Mon, 3 Jun 2002 14:04:46 GMT",
"version": "v1"
}
] |
2011-09-13
|
[
[
"Petrov",
"V. A.",
""
],
[
"Predazzi",
"E.",
""
],
[
"Prokudin",
"A.",
""
]
] |
An analysis of the Coulombic amplitude and its interference with the nuclear amplitude which is driven by the three-component Pomeron is presented. It is shown that different approaches towards the Coulomb phase evaluation give approximately uniform result at all energies and the difference is negligible at RHIC and LHC energies. We show that the use of the amplitude which was fitted to accomodate nucleon data only (in the region 0.01 < |t| < 14.5 (GeV^2)) combined with the Coulomb amplitude, reproduces the existing data in the Coulomb interference domain quite accurately without any adjustement of the parameters. As a consequence, we predict the differential cross section in the region of the Coulomb nucleon interference for both RHIC and LHC energies.
|
1512.04356
|
Giuliano Panico
|
Oleksii Matsedonskyi, Giuliano Panico and Andrea Wulzer
|
Top Partners Searches and Composite Higgs Models
|
32 pages, 15 figures
| null |
10.1007/JHEP04(2016)003
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Colored fermionic partners of the top quark are well-known signatures of the
Composite Higgs scenario and for this reason they have been and will be subject
of an intensive experimental study at the LHC. Performing an assessment of the
theoretical implications of this experimental effort is the goal of the present
paper. We proceed by analyzing a set of simple benchmark models, characterized
by simple two-dimensional parameter spaces where the results of the searches
are conveniently visualized and their impact quantified. We only draw exclusion
contours, in the hypothesis of no signal, but of course our formalism could
equally well be used to report discoveries in a theoretically useful format.
|
[
{
"created": "Mon, 14 Dec 2015 15:08:11 GMT",
"version": "v1"
}
] |
2016-05-04
|
[
[
"Matsedonskyi",
"Oleksii",
""
],
[
"Panico",
"Giuliano",
""
],
[
"Wulzer",
"Andrea",
""
]
] |
Colored fermionic partners of the top quark are well-known signatures of the Composite Higgs scenario and for this reason they have been and will be subject of an intensive experimental study at the LHC. Performing an assessment of the theoretical implications of this experimental effort is the goal of the present paper. We proceed by analyzing a set of simple benchmark models, characterized by simple two-dimensional parameter spaces where the results of the searches are conveniently visualized and their impact quantified. We only draw exclusion contours, in the hypothesis of no signal, but of course our formalism could equally well be used to report discoveries in a theoretically useful format.
|
hep-ph/9511445
|
Brian Wright
|
Paul H. Frampton (1), Bettina Keszthelyi (1), Brian D. Wright (1) and
Thomas W. Kephart (2) ((1) Institute of Field Physics, University of North
Carolina, Chapel Hill, (2) Department of Physics and Astronomy, Vanderbilt
University )
|
Constraining $\alpha_s(M_Z)$ from the Hidden Sector
|
12 pages (23k), in ReVTeX plus 3 postscript figures (27k), Submitted
to Physical Review Letters
| null | null |
IFP-714-UNC, VAND-TH-95-5
|
hep-ph
| null |
By including the effects of superstring thresholds, we reconsider minimal
string unification together with the requirement of producing a
supersymmetry-breaking gluino condensate in the hidden sector. This gives, for
examples of phenomenologically-viable $Z_8'$ and other related orbifolds, the
constraint that $0.1215 \leq \alpha_s(M_Z) \leq 0.1270$. In such models, a
hidden photino can be a source of cosmological dark matter detectable by
gravitational microlensing.
|
[
{
"created": "Wed, 29 Nov 1995 01:36:40 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Nov 1995 06:43:39 GMT",
"version": "v2"
}
] |
2008-02-03
|
[
[
"Frampton",
"Paul H.",
""
],
[
"Keszthelyi",
"Bettina",
""
],
[
"Wright",
"Brian D.",
""
],
[
"Kephart",
"Thomas W.",
""
]
] |
By including the effects of superstring thresholds, we reconsider minimal string unification together with the requirement of producing a supersymmetry-breaking gluino condensate in the hidden sector. This gives, for examples of phenomenologically-viable $Z_8'$ and other related orbifolds, the constraint that $0.1215 \leq \alpha_s(M_Z) \leq 0.1270$. In such models, a hidden photino can be a source of cosmological dark matter detectable by gravitational microlensing.
|
1205.6569
|
Per Osland
|
L. Basso, A. Lipniacka, F. Mahmoudi, S. Moretti, P. Osland, G. M.
Pruna, M. Purmohammadi
|
Probing the charged Higgs boson at the LHC in the CP-violating type-II
2HDM
|
37 pages, 16 figures; v2 updated treatment of LHC constraints
|
JHEP 1211 (2012) 011
|
10.1007/JHEP11(2012)011
|
CERN-PH-TH/2012-068; FR-PHENO-2012-005; SHEP-12-06
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a phenomenological study of a CP-violating two-Higgs-doublet Model
with type-II Yukawa couplings at the Large Hadron Collider (LHC). In the light
of recent LHC data, we focus on the parameter space that survives the current
and past experimental constraints as well as theoretical bounds on the model.
Once the phenomenological scenario is set, we analyse the scope of the LHC in
exploring this model through the discovery of a charged Higgs boson produced in
association with a W boson, with the former decaying into the lightest neutral
Higgs and a second W state, altogether yielding a b\bar b W^+W^- signature, of
which we exploit the W^+W^- semileptonic decays.
|
[
{
"created": "Wed, 30 May 2012 07:59:32 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Aug 2012 10:05:19 GMT",
"version": "v2"
}
] |
2012-11-13
|
[
[
"Basso",
"L.",
""
],
[
"Lipniacka",
"A.",
""
],
[
"Mahmoudi",
"F.",
""
],
[
"Moretti",
"S.",
""
],
[
"Osland",
"P.",
""
],
[
"Pruna",
"G. M.",
""
],
[
"Purmohammadi",
"M.",
""
]
] |
We present a phenomenological study of a CP-violating two-Higgs-doublet Model with type-II Yukawa couplings at the Large Hadron Collider (LHC). In the light of recent LHC data, we focus on the parameter space that survives the current and past experimental constraints as well as theoretical bounds on the model. Once the phenomenological scenario is set, we analyse the scope of the LHC in exploring this model through the discovery of a charged Higgs boson produced in association with a W boson, with the former decaying into the lightest neutral Higgs and a second W state, altogether yielding a b\bar b W^+W^- signature, of which we exploit the W^+W^- semileptonic decays.
|
2402.04184
|
Wei-Chih Huang
|
Bhaskar Dutta, Wei-Chih Huang, Doojin Kim, Jayden L. Newstead,
Jong-Chul Park, and Iman Shaukat Ali
|
Exciting Prospects for Dark Matter at Large-Volume Neutrino Detectors
|
7 pages, 4 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a new approach to search for light dark matter (DM) in the range
of keV-GeV via inelastic nucleus scattering at large-volume neutrino detectors
such as Borexino, DUNE, JUNO, and Hyper-K. The approach uses inelastic nuclear
scattering of cosmic-ray boosted DM, enabling a low-background search for DM in
these experiments. The large neutrino detectors with higher threshold can be
used since the nuclear deexcitation lines are $O(10)$ MeV. Using a hadrophilic
dark-gauge-boson-portal model as a benchmark, we show that the nuclear
inelastic channels generally provide better sensitivity than the elastic
scattering for a large region of light DM parameter space.
|
[
{
"created": "Tue, 6 Feb 2024 17:44:09 GMT",
"version": "v1"
}
] |
2024-02-07
|
[
[
"Dutta",
"Bhaskar",
""
],
[
"Huang",
"Wei-Chih",
""
],
[
"Kim",
"Doojin",
""
],
[
"Newstead",
"Jayden L.",
""
],
[
"Park",
"Jong-Chul",
""
],
[
"Ali",
"Iman Shaukat",
""
]
] |
We propose a new approach to search for light dark matter (DM) in the range of keV-GeV via inelastic nucleus scattering at large-volume neutrino detectors such as Borexino, DUNE, JUNO, and Hyper-K. The approach uses inelastic nuclear scattering of cosmic-ray boosted DM, enabling a low-background search for DM in these experiments. The large neutrino detectors with higher threshold can be used since the nuclear deexcitation lines are $O(10)$ MeV. Using a hadrophilic dark-gauge-boson-portal model as a benchmark, we show that the nuclear inelastic channels generally provide better sensitivity than the elastic scattering for a large region of light DM parameter space.
|
0712.0145
|
Sukanta Dutta
|
Sukanta Dutta (1) and Ashok Goyal (2) ((1) SGTB Khalsa College,
University of Delhi India, (2)Department of Physics and Astrophysics,
University of Delhi, India.)
|
Constraints on Astro-unparticle Physics from SN 1987A
|
12 pages, 2 postscript figures
|
JCAP0803:027,2008
|
10.1088/1475-7516/2008/03/027
| null |
hep-ph
| null |
SN 1987A observations have been used to place constraints on the interactions
between standard model particles and unparticles. In this study we calculate
the energy loss from the supernovae core through scalar, pseudo scalar, vector,
pseudo vector unparticle emission from nuclear bremsstrahlung for degenerate
nuclear matter interacting through one pion exchange. In order to examine the
constraints on $d_{\cal U}=1$ we considered the emission of scalar, pseudo
scalar, vector, pseudo vector and tensor through the pair annihilation process
$e^+e^-\to {\cal U} \gamma $. In addition we have re-examined other pair
annihilation processes. The most stringent bounds on the dimensionless coupling
constants for $d_{\cal U} =1$ and $\Lambda_{\cal U}= m_Z$ are obtained from
nuclear bremsstrahlung process for the pseudo scalar and pseudo-vector
couplings $\bigl|\lambda^{\cal P}_{0,1}\bigr|\leq 4\times 10^{-11}$ and for
tensor interaction, the best limit on dimensionless coupling is obtained from
$e^+ e^-\to {\cal U} \gamma$ and we get $\bigl|\lambda^{\cal T}\bigr| \leq
6\times 10^{-6}$.
|
[
{
"created": "Mon, 3 Dec 2007 19:01:25 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Jan 2008 16:45:41 GMT",
"version": "v2"
},
{
"created": "Wed, 16 Jan 2008 11:28:11 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Dutta",
"Sukanta",
""
],
[
"Goyal",
"Ashok",
""
]
] |
SN 1987A observations have been used to place constraints on the interactions between standard model particles and unparticles. In this study we calculate the energy loss from the supernovae core through scalar, pseudo scalar, vector, pseudo vector unparticle emission from nuclear bremsstrahlung for degenerate nuclear matter interacting through one pion exchange. In order to examine the constraints on $d_{\cal U}=1$ we considered the emission of scalar, pseudo scalar, vector, pseudo vector and tensor through the pair annihilation process $e^+e^-\to {\cal U} \gamma $. In addition we have re-examined other pair annihilation processes. The most stringent bounds on the dimensionless coupling constants for $d_{\cal U} =1$ and $\Lambda_{\cal U}= m_Z$ are obtained from nuclear bremsstrahlung process for the pseudo scalar and pseudo-vector couplings $\bigl|\lambda^{\cal P}_{0,1}\bigr|\leq 4\times 10^{-11}$ and for tensor interaction, the best limit on dimensionless coupling is obtained from $e^+ e^-\to {\cal U} \gamma$ and we get $\bigl|\lambda^{\cal T}\bigr| \leq 6\times 10^{-6}$.
|
0808.0650
|
Andre Rubbia
|
T. Kajita, S.B. Kim, A.Rubbia
|
Summary of the 3rd International Workshop on a Far Detector in Korea for
the J-PARC Beam
|
10 pages, 5 figures, to appear in Proc. 3rd International Workshop on
a Far Detector in Korea for the J-PARC Neutrino Beam, Univ. of Tokyo, Tokyo,
Japan, Sep.30 - Oct. 1, 2007
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The 3rd International Workshop on a Far Detector in Korea for the J-PARC
Neutrino Beam was held at the Hongo Campus of Tokyo University, Tokyo, Japan on
Sep. 30th and October 1, 2007. Forty seven physicists from Japan and Korea, as
well as Europe and USA, participated in the workshop and discussed the physics
opportunities offered by the J-PARC conventional neutrino beam detected by a
new large underground neutrino detector in Korea. In this paper, we highlight
some of the most relevant findings of the workshop.
|
[
{
"created": "Tue, 5 Aug 2008 13:43:29 GMT",
"version": "v1"
}
] |
2008-08-06
|
[
[
"Kajita",
"T.",
""
],
[
"Kim",
"S. B.",
""
],
[
"Rubbia",
"A.",
""
]
] |
The 3rd International Workshop on a Far Detector in Korea for the J-PARC Neutrino Beam was held at the Hongo Campus of Tokyo University, Tokyo, Japan on Sep. 30th and October 1, 2007. Forty seven physicists from Japan and Korea, as well as Europe and USA, participated in the workshop and discussed the physics opportunities offered by the J-PARC conventional neutrino beam detected by a new large underground neutrino detector in Korea. In this paper, we highlight some of the most relevant findings of the workshop.
|
hep-ph/9907522
|
Apostolos Pilaftsis
|
Ara Ioannisian and Apostolos Pilaftsis
|
Cumulative Non-Decoupling Effects of Kaluza-Klein Neutrinos in
Electroweak Processes
|
31 pages, LaTeX, to appear in Physical Review D
|
Phys.Rev. D62 (2000) 066001
|
10.1103/PhysRevD.62.066001
|
CERN-TH/99-230, MPI-Th/99-30, FERMILAB-PUB-99/215-T, THES-TP/99-09
|
hep-ph astro-ph hep-ex hep-th
| null |
In Kaluza-Klein theories of low-scale quantum gravity, gravitons and
isosinglet neutrinos may propagate in a higher-dimensional space with large
compact dimensions, whereas all particles of the Standard Model are confined on
a (1+3)-dimensional subspace. After compactification of the extra dimensions,
the resulting Yukawa couplings of the Kaluza-Klein neutrinos to the lepton
doublets become naturally very suppressed by a higher-dimensional volume
factor, in agreement with phenomenological observations. We show that one-loop
effects induced by Kaluza-Klein neutrinos, albeit tiny individually, act
cumulatively in electroweak processes, giving rise to a non-decoupling
behaviour for large values of the higher-dimensional Yukawa couplings. Owing to
the non-decoupling effects of Kaluza-Klein neutrinos, we can derive stronger
constraints on the parameters of the theory that originate from the
non-observation of flavour-violating and universality-breaking phenomena, which
involve the W and Z bosons, and the e, $\mu$ and $\tau$ leptons.
|
[
{
"created": "Tue, 27 Jul 1999 23:39:49 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Aug 1999 09:35:31 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Apr 2000 22:43:44 GMT",
"version": "v3"
}
] |
2009-10-31
|
[
[
"Ioannisian",
"Ara",
""
],
[
"Pilaftsis",
"Apostolos",
""
]
] |
In Kaluza-Klein theories of low-scale quantum gravity, gravitons and isosinglet neutrinos may propagate in a higher-dimensional space with large compact dimensions, whereas all particles of the Standard Model are confined on a (1+3)-dimensional subspace. After compactification of the extra dimensions, the resulting Yukawa couplings of the Kaluza-Klein neutrinos to the lepton doublets become naturally very suppressed by a higher-dimensional volume factor, in agreement with phenomenological observations. We show that one-loop effects induced by Kaluza-Klein neutrinos, albeit tiny individually, act cumulatively in electroweak processes, giving rise to a non-decoupling behaviour for large values of the higher-dimensional Yukawa couplings. Owing to the non-decoupling effects of Kaluza-Klein neutrinos, we can derive stronger constraints on the parameters of the theory that originate from the non-observation of flavour-violating and universality-breaking phenomena, which involve the W and Z bosons, and the e, $\mu$ and $\tau$ leptons.
|
hep-ph/9805288
|
Ivone Albuquerque
|
Ivone F.M.Albuquerque, Glennys R.Farrar and Edward W.Kolb
|
Exotic massive hadrons and ultra-high energy cosmic rays
|
27 pages, 15 figures - fig5b was replaced
|
Phys.Rev. D59 (1999) 015021
|
10.1103/PhysRevD.59.015021
|
FNAL-PUB-98/131-A; EFI-98-15; RU-98-19
|
hep-ph astro-ph
| null |
We investigate the proposal that primary cosmic rays of energy above the
Greisen-Zatsepin-Kuzmin cutoff are exotic massive strongly interacting
particles (uhecrons). We study the properties of air showers produced by
uhecrons and find that masses in excess of about 50 GeV are inconsistent with
the highest energy event observed. We also estimate that with sufficient
statistics a uhecron of mass as low as 10 GeV may be distinguished from a
proton.
|
[
{
"created": "Mon, 11 May 1998 21:59:28 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Aug 1998 19:48:47 GMT",
"version": "v2"
},
{
"created": "Fri, 2 Oct 1998 16:34:47 GMT",
"version": "v3"
}
] |
2009-10-31
|
[
[
"Albuquerque",
"Ivone F. M.",
""
],
[
"Farrar",
"Glennys R.",
""
],
[
"Kolb",
"Edward W.",
""
]
] |
We investigate the proposal that primary cosmic rays of energy above the Greisen-Zatsepin-Kuzmin cutoff are exotic massive strongly interacting particles (uhecrons). We study the properties of air showers produced by uhecrons and find that masses in excess of about 50 GeV are inconsistent with the highest energy event observed. We also estimate that with sufficient statistics a uhecron of mass as low as 10 GeV may be distinguished from a proton.
|
hep-ph/0309278
|
Aneesh Manohar
|
Christian W. Bauer, Christopher Lee, Aneesh V. Manohar, Mark B. Wise
|
Enhanced Nonperturbative Effects in Z Decays to Hadrons
|
17 pages. Paper reorganized, and more discussion and results included
|
Phys.Rev. D70 (2004) 034014
|
10.1103/PhysRevD.70.034014
| null |
hep-ph
| null |
We use soft collinear effective field theory (SCET) to study nonperturbative
strong interaction effects in Z decays to hadronic final states that are
enhanced in corners of phase space. These occur, for example, in the jet energy
distribution for two jet events near E_J=M_Z/2, the thrust distribution near
unity and the jet invariant mass distribution near zero. The extent to which
such nonperturbative effects for different observables are related is
discussed.
|
[
{
"created": "Thu, 25 Sep 2003 19:07:12 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Feb 2004 18:36:34 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Bauer",
"Christian W.",
""
],
[
"Lee",
"Christopher",
""
],
[
"Manohar",
"Aneesh V.",
""
],
[
"Wise",
"Mark B.",
""
]
] |
We use soft collinear effective field theory (SCET) to study nonperturbative strong interaction effects in Z decays to hadronic final states that are enhanced in corners of phase space. These occur, for example, in the jet energy distribution for two jet events near E_J=M_Z/2, the thrust distribution near unity and the jet invariant mass distribution near zero. The extent to which such nonperturbative effects for different observables are related is discussed.
|
0907.0051
|
HongWei Ke
|
Hong-Wei Ke, Zuo Li, Jing-Ling Chen, Yi-Bing Ding and Xue-Qian Li
|
Symmetry of Dirac Equation and Corresponding Phenomenology
|
15pages, 3 figures, accepted by International Journal of Modern
Physics A
|
Int.J.Mod.Phys.A25:1123-1134,2010
|
10.1142/S0217751X1004783X
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It has been suggested that the high symmetries in the Schr\"odinger equation
with the Coulomb or harmonic oscillator potentials may remain in the
corresponding relativistic Dirac equation. If the principle is correct, in the
Dirac equation the potential should have a form as ${(1+\beta)\over 2}V(r)$
where $V(r)$ is ${-e^2\over r}$ for hydrogen atom and $\kappa r^2$ for harmonic
oscillator. However, in the case of hydrogen atom, by this combination the
spin-orbit coupling term would not exist and it is inconsistent with the
observational spectra of hydrogen atom, so that the symmetry of SO(4) must
reduce into SU(2). The governing mechanisms QED and QCD which induce potential
are vector-like theories, so at the leading order only vector potential exists.
However, the higher order effects may cause a scalar fraction. In this work, we
show that for QED, the symmetry restoration is very small and some discussions
on the symmetry breaking are made. At the end, we briefly discuss the QCD case
and indicate that the situation for QCD is much more complicated and
interesting.
|
[
{
"created": "Wed, 1 Jul 2009 01:52:48 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Oct 2009 05:57:09 GMT",
"version": "v2"
}
] |
2015-05-13
|
[
[
"Ke",
"Hong-Wei",
""
],
[
"Li",
"Zuo",
""
],
[
"Chen",
"Jing-Ling",
""
],
[
"Ding",
"Yi-Bing",
""
],
[
"Li",
"Xue-Qian",
""
]
] |
It has been suggested that the high symmetries in the Schr\"odinger equation with the Coulomb or harmonic oscillator potentials may remain in the corresponding relativistic Dirac equation. If the principle is correct, in the Dirac equation the potential should have a form as ${(1+\beta)\over 2}V(r)$ where $V(r)$ is ${-e^2\over r}$ for hydrogen atom and $\kappa r^2$ for harmonic oscillator. However, in the case of hydrogen atom, by this combination the spin-orbit coupling term would not exist and it is inconsistent with the observational spectra of hydrogen atom, so that the symmetry of SO(4) must reduce into SU(2). The governing mechanisms QED and QCD which induce potential are vector-like theories, so at the leading order only vector potential exists. However, the higher order effects may cause a scalar fraction. In this work, we show that for QED, the symmetry restoration is very small and some discussions on the symmetry breaking are made. At the end, we briefly discuss the QCD case and indicate that the situation for QCD is much more complicated and interesting.
|
1311.7425
|
Matthias Steinhauser
|
Jonathan Grigo, Jens Hoff, Kirill Melnikov, Matthias Steinhauser
|
Higgs boson pair production at the LHC: top-quark mass effects at NLO
|
8 pages, Presented at the 11th International Symposium on Radiative
Corrections, RADCOR 2013, 22.-27. September 2013, Lumley Castle, Durham, UK
| null | null |
TTP13-043, SFB/CPP-13-105
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Higgs boson pair production is considered at next-to-leading order with
special emphasis on the effect of a finite top quark mass. It is shown that,
unlike for single-Higgs boson production, power-suppressed corrections are
numerically important.
|
[
{
"created": "Thu, 28 Nov 2013 21:04:44 GMT",
"version": "v1"
}
] |
2013-12-02
|
[
[
"Grigo",
"Jonathan",
""
],
[
"Hoff",
"Jens",
""
],
[
"Melnikov",
"Kirill",
""
],
[
"Steinhauser",
"Matthias",
""
]
] |
Higgs boson pair production is considered at next-to-leading order with special emphasis on the effect of a finite top quark mass. It is shown that, unlike for single-Higgs boson production, power-suppressed corrections are numerically important.
|
2110.13270
|
David London
|
David London and Joaquim Matias
|
$B$ Flavour Anomalies: 2021 Theoretical Status Report
|
48 pages, 1 figure. To be published in the Annual Review of Nuclear
and Particle Science. Changes: minor modifications of the text, references
updated and added
|
Annual Review of Nuclear and Particle Science, Vol. 72, No. 1, pp.
37-68, 2022
|
10.1146/annurev-nucl-102020-090209
|
UdeM-GPP-TH-21-289
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
At the present time, there are discrepancies with the predictions of the SM
in several observables involving $b \to s \ell^+ \ell^-$ and $b \to c \ell^-
{\bar\nu}_\ell$ decays. These are the $B$ flavour anomalies. In this review, we
summarize the data as of Moriond 2021 and present theoretical new-physics
explanations from both a model-independent effective-field-theory point of view
and through the building of explicit models. Throughout, we stress the
complementarity of these two approaches. We also discuss combined explanations
of both $B$ anomalies, and present models that also explain other problems,
such as dark matter, $(g-2)_\mu$, neutrino properties, and hadronic anomalies.
|
[
{
"created": "Mon, 25 Oct 2021 21:10:25 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Nov 2021 20:03:58 GMT",
"version": "v2"
}
] |
2022-10-04
|
[
[
"London",
"David",
""
],
[
"Matias",
"Joaquim",
""
]
] |
At the present time, there are discrepancies with the predictions of the SM in several observables involving $b \to s \ell^+ \ell^-$ and $b \to c \ell^- {\bar\nu}_\ell$ decays. These are the $B$ flavour anomalies. In this review, we summarize the data as of Moriond 2021 and present theoretical new-physics explanations from both a model-independent effective-field-theory point of view and through the building of explicit models. Throughout, we stress the complementarity of these two approaches. We also discuss combined explanations of both $B$ anomalies, and present models that also explain other problems, such as dark matter, $(g-2)_\mu$, neutrino properties, and hadronic anomalies.
|
1602.01330
|
Nobuhito Maru
|
Nobuhito Maru
|
Nambu-Jona-Lasinio Theory and Dynamical Breaking of Supersymmetry
|
33 pages, 3 figures, a review article prepared for Special Section
"Nambu, A Foreteller of Modern Physics (1)" for Progress of Theoretical and
Experimental Physics (PTEP). arXiv admin note: substantial text overlap with
arXiv:1301.7548
| null |
10.1093/ptep/ptw018
|
OCU-PHYS 441
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A recently proposed new mechanism of D-term triggered dynamical supersymmetry
breaking is reviewed. Supersymmetry is dynamically broken by nonvanishing
D-term vacuum expectation value, which is realized as a nontrivial solution of
the gap equation in the self-consistent approximation as in the case of
Nambu-Jona-Lasinio model and BCS superconductivity.
|
[
{
"created": "Wed, 3 Feb 2016 15:05:58 GMT",
"version": "v1"
}
] |
2016-05-25
|
[
[
"Maru",
"Nobuhito",
""
]
] |
A recently proposed new mechanism of D-term triggered dynamical supersymmetry breaking is reviewed. Supersymmetry is dynamically broken by nonvanishing D-term vacuum expectation value, which is realized as a nontrivial solution of the gap equation in the self-consistent approximation as in the case of Nambu-Jona-Lasinio model and BCS superconductivity.
|
1204.0863
|
Bo-Qiang Ma
|
Tao Peng, Bo-Qiang Ma
|
Heavy quarkonium 2S states in light-front quark model
|
5 latex pages, final version for journal publication
|
Eur.Phys.J. A48 (2012) 66
|
10.1140/epja/i2012-12066-9
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the charmonium 2S states $\psi'$ and $\eta_c'$, and the bottomonium
2S states $\Upsilon'$ and $\eta_b'$, using the light-front quark model and the
2S state wave function of harmonic oscillator as the approximation of the 2S
quarkonium wave function. The decay constants, transition form factors and
masses of these mesons are calculated and compared with experimental data.
Predictions of quantities such as Br$(\psi' \to \gamma \eta_c')$ are made. The
2S wave function may help us learn more about the structure of these heavy
quarkonia.
|
[
{
"created": "Wed, 4 Apr 2012 05:05:58 GMT",
"version": "v1"
},
{
"created": "Fri, 11 May 2012 13:31:18 GMT",
"version": "v2"
}
] |
2012-05-24
|
[
[
"Peng",
"Tao",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] |
We study the charmonium 2S states $\psi'$ and $\eta_c'$, and the bottomonium 2S states $\Upsilon'$ and $\eta_b'$, using the light-front quark model and the 2S state wave function of harmonic oscillator as the approximation of the 2S quarkonium wave function. The decay constants, transition form factors and masses of these mesons are calculated and compared with experimental data. Predictions of quantities such as Br$(\psi' \to \gamma \eta_c')$ are made. The 2S wave function may help us learn more about the structure of these heavy quarkonia.
|
1510.05462
|
Maurizio Lusignoli
|
A. De R\'ujula and M. Lusignoli
|
The calorimetric spectrum of the electron-capture decay of $^{163}$Ho. A
preliminary analysis of the preliminary data
|
6 pages, 5 figures. Section IV and Fig.3 added. Minor text
modifications
| null | null | null |
hep-ph nucl-th physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It is in principle possible to measure directly the electron neutrino mass
(or masses and mixing angles) in weak electron-capture decays. The optimal
nuclide in this respect is $^{163}$Ho. The favoured experimental technique,
currently pursued in various experiments (ECHo, HOLMES and NuMECS) is
"calorimetric". The calorimetric energy spectrum is a sum over the unstable
vacant orbitals, or "holes", left by the electrons weakly captured by the
nucleus. We discuss the current progress in this field and analize the
preliminary data. Our conclusion is that, as pointed out by Robertson, the
contribution of two-hole states is not negligible. But --in strong
contradistinction with the tacit conclusion of previous comparisons of theory
and observations-- we find a quite satisfactory agreement. A crucial point is
that, in the creation of secondary holes, electron shakeoff and not only
electron shakeup must be taken into account.
|
[
{
"created": "Mon, 19 Oct 2015 13:21:47 GMT",
"version": "v1"
},
{
"created": "Sun, 8 Nov 2015 16:36:17 GMT",
"version": "v2"
}
] |
2015-11-10
|
[
[
"De Rújula",
"A.",
""
],
[
"Lusignoli",
"M.",
""
]
] |
It is in principle possible to measure directly the electron neutrino mass (or masses and mixing angles) in weak electron-capture decays. The optimal nuclide in this respect is $^{163}$Ho. The favoured experimental technique, currently pursued in various experiments (ECHo, HOLMES and NuMECS) is "calorimetric". The calorimetric energy spectrum is a sum over the unstable vacant orbitals, or "holes", left by the electrons weakly captured by the nucleus. We discuss the current progress in this field and analize the preliminary data. Our conclusion is that, as pointed out by Robertson, the contribution of two-hole states is not negligible. But --in strong contradistinction with the tacit conclusion of previous comparisons of theory and observations-- we find a quite satisfactory agreement. A crucial point is that, in the creation of secondary holes, electron shakeoff and not only electron shakeup must be taken into account.
|
0712.4263
|
Juan Garcia-Bellido
|
Andres Diaz-Gil, Juan Garcia-Bellido, Margarita Garcia Perez and
Antonio Gonzalez-Arroyo
|
Magnetic field production during preheating at the electroweak scale
|
4 pages, 6 figures, uses revtex4
|
Phys.Rev.Lett.100:241301,2008
|
10.1103/PhysRevLett.100.241301
|
IFT-UAM/CSIC-07-65
|
hep-ph astro-ph hep-lat
| null |
We study the generation of magnetic fields during preheating within an
scenario of hybrid inflation at the electroweak (EW) scale. We find that the
non-perturbative and strongly out-of-equilibrium process of magnetic field
production occurs along the lines predicted by Vachaspati many years ago. The
system starts in the false vacuum at the end of inflation, and very quickly the
initial quantum fluctuations of the Higgs field get amplified via long
wavelength spinodal instabilities. The subsequent nucleation of the random
Gaussian Higgs field bubbles (lumps) leads to EW symmetry breaking, and to the
creation of $Z$-strings, which soon decay, along with longwave magnetic flux
tubes with nontrivial helicity. The intensity and scales in these helical
magnetic fields are consistent with their later development into the microgauss
fields observed in galaxies and clusters of galaxies.
|
[
{
"created": "Thu, 27 Dec 2007 18:22:33 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Diaz-Gil",
"Andres",
""
],
[
"Garcia-Bellido",
"Juan",
""
],
[
"Perez",
"Margarita Garcia",
""
],
[
"Gonzalez-Arroyo",
"Antonio",
""
]
] |
We study the generation of magnetic fields during preheating within an scenario of hybrid inflation at the electroweak (EW) scale. We find that the non-perturbative and strongly out-of-equilibrium process of magnetic field production occurs along the lines predicted by Vachaspati many years ago. The system starts in the false vacuum at the end of inflation, and very quickly the initial quantum fluctuations of the Higgs field get amplified via long wavelength spinodal instabilities. The subsequent nucleation of the random Gaussian Higgs field bubbles (lumps) leads to EW symmetry breaking, and to the creation of $Z$-strings, which soon decay, along with longwave magnetic flux tubes with nontrivial helicity. The intensity and scales in these helical magnetic fields are consistent with their later development into the microgauss fields observed in galaxies and clusters of galaxies.
|
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