id
stringlengths 9
14
| submitter
stringlengths 1
56
⌀ | authors
stringlengths 5
7.68k
| title
stringlengths 3
299
| comments
stringlengths 1
1.15k
⌀ | journal-ref
stringlengths 9
298
⌀ | doi
stringlengths 12
97
⌀ | report-no
stringlengths 3
341
⌀ | categories
stringclasses 869
values | license
stringclasses 9
values | orig_abstract
stringlengths 16
2.44k
| versions
listlengths 1
39
| update_date
stringlengths 10
10
| authors_parsed
listlengths 1
565
| abstract
stringlengths 13
2.44k
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2306.01362
|
Johannes Bl\"umlein
|
Johannes Bl\"umlein
|
Deep-Inelastic Scattering: What do we know ?
|
18 pages, 4 figures, Dedicated to the Memory of Harald Fritzsch
| null | null |
DESY 23--066, DO--TH 23/06
|
hep-ph hep-ex hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
A survey is given on the current status of the theoretical description of
unpolarized and polarized deep--inelastic scattering processes in Quantum
Chromodynamics at large virtualities.
|
[
{
"created": "Fri, 2 Jun 2023 08:37:20 GMT",
"version": "v1"
}
] |
2023-06-06
|
[
[
"Blümlein",
"Johannes",
""
]
] |
A survey is given on the current status of the theoretical description of unpolarized and polarized deep--inelastic scattering processes in Quantum Chromodynamics at large virtualities.
|
2308.02262
|
Zhou Rui
|
Zhou Rui, Jia-Ming Li, Chao-Qi Zhang
|
Estimates of the isospin-violating $\Lambda_b\rightarrow \Sigma^0 \phi,
\Sigma^0 J/\psi$ decays and the $\Sigma-\Lambda$ mixing
|
23 pages, 1 figure, 10 tables;
|
Phys. Rev. D 108, 033004 (2023)
|
10.1103/PhysRevD.108.033004
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyse the two purely isospin-violating decays $\Lambda_b\rightarrow
\Sigma^0 \phi$ and $\Lambda_b\rightarrow \Sigma^0 J/\psi$, proceed merely via
the exchange topologies, in the framework of perturbative QCD approach.
Assuming $\Sigma^0$ baryon belongs to the idealized isospin triplet with quark
components of $usd$, the branching ratios of the two decay modes are predicted
to be tiny, of the order $10^{-8}-10^{-9}$, leading to a difficulty in
observing them. We then extend our study to include the $\Sigma-\Lambda$
mixing.It is found that the mixing has significant effect on the
$\Lambda_b\rightarrow \Sigma$ decays, especially it can greatly increase the
rate of the $J/\psi$ process, by as much as two orders of magnitude, yield
$10^{-7}$, which should be searchable in the future. We also estimate a set of
asymmetry observables with and without the mixing effect, which will be tested
in coming experiments.
|
[
{
"created": "Fri, 4 Aug 2023 11:38:07 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Aug 2023 13:28:51 GMT",
"version": "v2"
}
] |
2023-08-28
|
[
[
"Rui",
"Zhou",
""
],
[
"Li",
"Jia-Ming",
""
],
[
"Zhang",
"Chao-Qi",
""
]
] |
We analyse the two purely isospin-violating decays $\Lambda_b\rightarrow \Sigma^0 \phi$ and $\Lambda_b\rightarrow \Sigma^0 J/\psi$, proceed merely via the exchange topologies, in the framework of perturbative QCD approach. Assuming $\Sigma^0$ baryon belongs to the idealized isospin triplet with quark components of $usd$, the branching ratios of the two decay modes are predicted to be tiny, of the order $10^{-8}-10^{-9}$, leading to a difficulty in observing them. We then extend our study to include the $\Sigma-\Lambda$ mixing.It is found that the mixing has significant effect on the $\Lambda_b\rightarrow \Sigma$ decays, especially it can greatly increase the rate of the $J/\psi$ process, by as much as two orders of magnitude, yield $10^{-7}$, which should be searchable in the future. We also estimate a set of asymmetry observables with and without the mixing effect, which will be tested in coming experiments.
|
hep-ph/9806218
|
Hitoshi Murayama
|
Lawrence J. Hall and Hitoshi Murayama (UC Berkeley, LBNL)
|
Study of Inclusive Multi-Ring Events from Atmospheric Neutrinos
|
12 pages, 3 figures, LaTeX2e, psfig.sty
|
Phys.Lett.B436:323-330,1998
|
10.1016/S0370-2693(98)00865-X
|
UCB-PTH-98/31, LBNL-41890
|
hep-ph astro-ph hep-ex
| null |
The current analysis of atmospheric neutrinos by the Super-Kamiokande
Collaboration is based only on fully-contained one-ring events and partially
contained events. We show that the up-down ratio of fully-contained, inclusive,
multi-ring events gives an independent test of the atmospheric neutrino
anomaly, without the need for particle identification. Moreover, this class of
events is rich in neutral current events and hence gives crucial information
for discriminating between oscillations of \nu_\mu into \nu_{e, \tau} and
\nu_s.
|
[
{
"created": "Mon, 1 Jun 1998 21:48:20 GMT",
"version": "v1"
}
] |
2009-09-29
|
[
[
"Hall",
"Lawrence J.",
"",
"UC Berkeley, LBNL"
],
[
"Murayama",
"Hitoshi",
"",
"UC Berkeley, LBNL"
]
] |
The current analysis of atmospheric neutrinos by the Super-Kamiokande Collaboration is based only on fully-contained one-ring events and partially contained events. We show that the up-down ratio of fully-contained, inclusive, multi-ring events gives an independent test of the atmospheric neutrino anomaly, without the need for particle identification. Moreover, this class of events is rich in neutral current events and hence gives crucial information for discriminating between oscillations of \nu_\mu into \nu_{e, \tau} and \nu_s.
|
1703.04471
|
Eligio Lisi
|
Francesco Capozzi, Eleonora Di Valentino, Eligio Lisi, Antonio
Marrone, Alessandro Melchiorri, Antonio Palazzo
|
Global constraints on absolute neutrino masses and their ordering
|
17 pages, including 3 tables and 11 figures
|
Phys. Rev. D 95, 096014 (2017)
|
10.1103/PhysRevD.95.096014
| null |
hep-ph astro-ph.CO hep-ex nucl-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Within the standard three-neutrino framework, the absolute neutrino masses
and their ordering (either normal, NO, or inverted, IO) are currently unknown.
However, the combination of current data coming from oscillation experiments,
neutrinoless double beta decay searches, and cosmological surveys, can provide
interesting constraints for such unknowns in the sub-eV mass range, down to
O(0.1) eV in some cases. We discuss current limits on absolute neutrino mass
observables by performing a global data analysis, that includes the latest
results from oscillation experiments, neutrinoless double beta decay bounds
from the KamLAND-Zen experiment, and constraints from representative
combinations of Planck measurements and other cosmological data sets. In
general, NO appears to be somewhat favored with respect to IO at the level of
~2 sigma, mainly by neutrino oscillation data (especially atmospheric),
corroborated by cosmological data in some cases. Detailed constraints are
obtained via the chi^2 method, by expanding the parameter space either around
separate minima in NO and IO, or around the absolute minimum in any ordering.
Implications for upcoming oscillation and non-oscillation neutrino experiments,
including beta-decay searches, are also discussed.
|
[
{
"created": "Mon, 13 Mar 2017 16:32:47 GMT",
"version": "v1"
}
] |
2017-06-07
|
[
[
"Capozzi",
"Francesco",
""
],
[
"Di Valentino",
"Eleonora",
""
],
[
"Lisi",
"Eligio",
""
],
[
"Marrone",
"Antonio",
""
],
[
"Melchiorri",
"Alessandro",
""
],
[
"Palazzo",
"Antonio",
""
]
] |
Within the standard three-neutrino framework, the absolute neutrino masses and their ordering (either normal, NO, or inverted, IO) are currently unknown. However, the combination of current data coming from oscillation experiments, neutrinoless double beta decay searches, and cosmological surveys, can provide interesting constraints for such unknowns in the sub-eV mass range, down to O(0.1) eV in some cases. We discuss current limits on absolute neutrino mass observables by performing a global data analysis, that includes the latest results from oscillation experiments, neutrinoless double beta decay bounds from the KamLAND-Zen experiment, and constraints from representative combinations of Planck measurements and other cosmological data sets. In general, NO appears to be somewhat favored with respect to IO at the level of ~2 sigma, mainly by neutrino oscillation data (especially atmospheric), corroborated by cosmological data in some cases. Detailed constraints are obtained via the chi^2 method, by expanding the parameter space either around separate minima in NO and IO, or around the absolute minimum in any ordering. Implications for upcoming oscillation and non-oscillation neutrino experiments, including beta-decay searches, are also discussed.
|
hep-ph/9403349
|
Rohini Godbole
|
A.S. Joshipura and M. Nowakowski
|
Leptonic CP Violation in Supersymmetric Standard Model
|
REVTEX, 15 pages
|
Phys.Rev.D51:5271-5275,1995
|
10.1103/PhysRevD.51.5271
| null |
hep-ph
| null |
We point out the possibility of spontaneous and hard CP-violation in the
scalar potential of R-parity broken supersymmetric Standard Model. The
existence of spontaneous CP-violation depends crucially on the R-parity
breaking terms in the superpotential and, in addition, on the choice of the
soft supersymmetry breaking terms. Unlike in theories with R-parity
conservation, it is natural, in the context of the present model, for the
sneutrinos to acquire (complex) vacuum expectation values. In the context of
this model we examine here the global implications, like the strength of the
CP-violating interactions and the neutrino masses.
|
[
{
"created": "Thu, 24 Mar 1994 03:21:54 GMT",
"version": "v1"
}
] |
2010-11-01
|
[
[
"Joshipura",
"A. S.",
""
],
[
"Nowakowski",
"M.",
""
]
] |
We point out the possibility of spontaneous and hard CP-violation in the scalar potential of R-parity broken supersymmetric Standard Model. The existence of spontaneous CP-violation depends crucially on the R-parity breaking terms in the superpotential and, in addition, on the choice of the soft supersymmetry breaking terms. Unlike in theories with R-parity conservation, it is natural, in the context of the present model, for the sneutrinos to acquire (complex) vacuum expectation values. In the context of this model we examine here the global implications, like the strength of the CP-violating interactions and the neutrino masses.
|
hep-ph/0306179
|
Shahin Mamedov
|
Sh.Mamedov
|
Motion of Colored Particle in a Chromomagnetic Field
|
10 pages
|
Eur.Phys.J. C30 (2003) 583-588
|
10.1140/epjc/s2003-01314-2
| null |
hep-ph
| null |
The Dirac equation in a chromomagnetic field is solved for colored particle
moving in a limited space volume. Quantized energy levels and the corresponding
wave functions are found for backgrounds both directed along third axes and
having spherical symmetry. It was shown interrelation with the case of motion
in an infinite space volume.
|
[
{
"created": "Thu, 19 Jun 2003 16:50:31 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Jun 2003 14:44:02 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Jun 2003 14:58:59 GMT",
"version": "v3"
},
{
"created": "Thu, 25 Sep 2003 08:07:12 GMT",
"version": "v4"
}
] |
2007-05-23
|
[
[
"Mamedov",
"Sh.",
""
]
] |
The Dirac equation in a chromomagnetic field is solved for colored particle moving in a limited space volume. Quantized energy levels and the corresponding wave functions are found for backgrounds both directed along third axes and having spherical symmetry. It was shown interrelation with the case of motion in an infinite space volume.
|
2407.19383
|
Zhi-Gang Wang
|
Wen-Chao Dong, Zhi-Gang Wang
|
Hunting for the prospective $T_{cc}$ family based on the
diquark-antidiquark configuration
|
23 pages
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Instigated by the first $T_{cc}$ observation at the LHCb Collaboration, the
spectroscopic properties of the entire isoscalar and isovector $T_{cc}$ family
are systematically unveiled by means of multiple sorts of relativized and
nonrelativistic diquark formalisms, encompassing the Godfrey-Isgur relativized
diquark model, the modified Godfrey-Isgur relativized diquark model
incorporating the color screening effects, the nonrelativistic diquark model
with the Gaussian type hyperfine potential, and the nonrelativistic diquark
model with the Yukawa type hyperfine potential. The theoretical outcomes of
various diquark-antidiquark scenarios are inclined to categorize the
$T_{cc}(3875)^+$ structure as the exemplary candidate of the $1S$-wave
isoscalar axial-vector double-charm tetraquark state. In light of the
diquark-antidiquark configuration, this work investigates the mixing angles of
the orbitally excited isovector $T_{cc}$ states and the magic mixing angles of
the ideal heavy-light tetraquarks for the first time. As the advancement of the
experimental detection capability, these phenomenological prognostications will
effectively boost the hunting for the prospective low-lying $T_{cc}$ states in
the future.
|
[
{
"created": "Sun, 28 Jul 2024 03:45:41 GMT",
"version": "v1"
}
] |
2024-07-30
|
[
[
"Dong",
"Wen-Chao",
""
],
[
"Wang",
"Zhi-Gang",
""
]
] |
Instigated by the first $T_{cc}$ observation at the LHCb Collaboration, the spectroscopic properties of the entire isoscalar and isovector $T_{cc}$ family are systematically unveiled by means of multiple sorts of relativized and nonrelativistic diquark formalisms, encompassing the Godfrey-Isgur relativized diquark model, the modified Godfrey-Isgur relativized diquark model incorporating the color screening effects, the nonrelativistic diquark model with the Gaussian type hyperfine potential, and the nonrelativistic diquark model with the Yukawa type hyperfine potential. The theoretical outcomes of various diquark-antidiquark scenarios are inclined to categorize the $T_{cc}(3875)^+$ structure as the exemplary candidate of the $1S$-wave isoscalar axial-vector double-charm tetraquark state. In light of the diquark-antidiquark configuration, this work investigates the mixing angles of the orbitally excited isovector $T_{cc}$ states and the magic mixing angles of the ideal heavy-light tetraquarks for the first time. As the advancement of the experimental detection capability, these phenomenological prognostications will effectively boost the hunting for the prospective low-lying $T_{cc}$ states in the future.
|
2402.12726
|
Meng-Lin Du Dr.
|
J. Nieves, A. Feijoo, M. Albaladejo, and Meng-Lin Du
|
Lowest-lying ${\frac{1}{2}}^-$ and ${\frac{3}{2}}^-$ $\Lambda_{Q}$
resonances: from the strange to the bottom sectors
|
41 pages, 13 figures, and 7 tables
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We present a detailed study of the lowest-lying ${\frac{1}{2}}^-$ and
${\frac{3}{2}}^-$ $\Lambda_{Q}$ resonances both in the heavy quark (bottom and
charm) and the strange sectors. We have paid special attention to the interplay
between the constituent quark-model and chiral baryon-meson degrees of freedom,
which are coupled using a unitarized scheme consistent with leading-order heavy
quark symmetries. We show that the $\Lambda_b(5912)$ [$J^P=1/2^-$],
$\Lambda_b(5920)$ [$J^P=3/2^-$] and the $\Lambda_c(2625)$ [$J^P=3/2^-$], and
the $\Lambda(1520)$ [$J^P=3/2^-$] admitting larger breaking corrections, are
heavy-quark spin-flavor siblings. They can be seen as dressed quark-model
states with $\Sigma_{Q}^{(*)}\pi$ molecular components of the order of 30\%.
The ${J^P=\frac{1}{2}}^-$ $\Lambda_c(2595)$ has, however, a higher molecular
probability of at least $50$\%, and even values greater than 70\% can be easily
accommodated. This is because it is located almost on top of the threshold of
the $\Sigma_c\pi$ pair, which largely influences its properties. Although the
light degrees of freedom in this resonance would be coupled to spin-parity
$1^-$ as in the $\Lambda_b(5912)$, $\Lambda_b(5920)$ and $\Lambda_c(2625)$, the
$\Lambda_c(2595)$ should not be considered as a heavy-quark spin-flavor partner
of the former ones. We also show that the $\Lambda(1405)$ chiral two-pole
pattern does not have analogs in the $\frac{1}{2}^-$ charmed and bottomed
sectors, because the $ND^{(*)}$ and $N\overline{B}{}^{(*)} $ channels do not
play for heavy quarks the decisive role that the $N \overline{K}$ does in the
strange sector, and the notable influence of the bare quark-model states for
the charm and bottom resonances. Finally, we predict the existence of two
$\Lambda_b(6070)$ and two $\Lambda_c(2765)$ heavy-quark spin and flavor sibling
odd parity states.
|
[
{
"created": "Tue, 20 Feb 2024 05:27:55 GMT",
"version": "v1"
}
] |
2024-02-21
|
[
[
"Nieves",
"J.",
""
],
[
"Feijoo",
"A.",
""
],
[
"Albaladejo",
"M.",
""
],
[
"Du",
"Meng-Lin",
""
]
] |
We present a detailed study of the lowest-lying ${\frac{1}{2}}^-$ and ${\frac{3}{2}}^-$ $\Lambda_{Q}$ resonances both in the heavy quark (bottom and charm) and the strange sectors. We have paid special attention to the interplay between the constituent quark-model and chiral baryon-meson degrees of freedom, which are coupled using a unitarized scheme consistent with leading-order heavy quark symmetries. We show that the $\Lambda_b(5912)$ [$J^P=1/2^-$], $\Lambda_b(5920)$ [$J^P=3/2^-$] and the $\Lambda_c(2625)$ [$J^P=3/2^-$], and the $\Lambda(1520)$ [$J^P=3/2^-$] admitting larger breaking corrections, are heavy-quark spin-flavor siblings. They can be seen as dressed quark-model states with $\Sigma_{Q}^{(*)}\pi$ molecular components of the order of 30\%. The ${J^P=\frac{1}{2}}^-$ $\Lambda_c(2595)$ has, however, a higher molecular probability of at least $50$\%, and even values greater than 70\% can be easily accommodated. This is because it is located almost on top of the threshold of the $\Sigma_c\pi$ pair, which largely influences its properties. Although the light degrees of freedom in this resonance would be coupled to spin-parity $1^-$ as in the $\Lambda_b(5912)$, $\Lambda_b(5920)$ and $\Lambda_c(2625)$, the $\Lambda_c(2595)$ should not be considered as a heavy-quark spin-flavor partner of the former ones. We also show that the $\Lambda(1405)$ chiral two-pole pattern does not have analogs in the $\frac{1}{2}^-$ charmed and bottomed sectors, because the $ND^{(*)}$ and $N\overline{B}{}^{(*)} $ channels do not play for heavy quarks the decisive role that the $N \overline{K}$ does in the strange sector, and the notable influence of the bare quark-model states for the charm and bottom resonances. Finally, we predict the existence of two $\Lambda_b(6070)$ and two $\Lambda_c(2765)$ heavy-quark spin and flavor sibling odd parity states.
|
2107.05209
|
Kazem Azizi
|
A. T\"urkan, G. Bozk{\i}r, K. Azizi
|
Properties of spin-1/2 heavy baryons at nonzero temperature
|
15 Pages, 3 Figures and 11 Tables
| null |
10.1103/PhysRevD.104.094029
| null |
hep-ph hep-ex hep-lat
|
http://creativecommons.org/licenses/by/4.0/
|
The spectroscopic properties of single heavy spin-1/2 $\Lambda_{Q}$,
$\Sigma_{Q}$, $\Xi^{(\prime)}_{Q}$ and $ \Omega_{Q}$ baryons are investigated
at finite temperature in the framework of thermal QCD sum rule. We discuss the
behavior of the mass and residue of these baryons with respect to temperature
taking into account contributions of non-perturbative operators up to dimension
eight. We include additional operators coming from the Wilson expansion due to
breaking the Lorentz invariance at non-zero temperature. The obtained results
show that the mass of these baryons remain stable up to roughly $T=108$ MeV
while their residue are unchanged up to $T=93$ MeV. After these points, the
mass and residue start to diminish by increasing the temperature. The shifts in
the mass and residue for both the bottom and charm channels are considerably
large and we observe the melting of these baryons near to the pseudo-critical
temperature determined by recent lattice QCD calculations. We present our
results for the mass of these baryons with both the positive and negative
parity at $ T\rightarrow 0 $ limit, which are consistent with the existing
theoretical predictions as well as experimental data.
|
[
{
"created": "Mon, 12 Jul 2021 06:01:36 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Sep 2021 12:07:13 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Nov 2021 08:40:49 GMT",
"version": "v3"
}
] |
2021-12-01
|
[
[
"Türkan",
"A.",
""
],
[
"Bozkır",
"G.",
""
],
[
"Azizi",
"K.",
""
]
] |
The spectroscopic properties of single heavy spin-1/2 $\Lambda_{Q}$, $\Sigma_{Q}$, $\Xi^{(\prime)}_{Q}$ and $ \Omega_{Q}$ baryons are investigated at finite temperature in the framework of thermal QCD sum rule. We discuss the behavior of the mass and residue of these baryons with respect to temperature taking into account contributions of non-perturbative operators up to dimension eight. We include additional operators coming from the Wilson expansion due to breaking the Lorentz invariance at non-zero temperature. The obtained results show that the mass of these baryons remain stable up to roughly $T=108$ MeV while their residue are unchanged up to $T=93$ MeV. After these points, the mass and residue start to diminish by increasing the temperature. The shifts in the mass and residue for both the bottom and charm channels are considerably large and we observe the melting of these baryons near to the pseudo-critical temperature determined by recent lattice QCD calculations. We present our results for the mass of these baryons with both the positive and negative parity at $ T\rightarrow 0 $ limit, which are consistent with the existing theoretical predictions as well as experimental data.
|
hep-ph/9709502
|
Mar Bastero-Gil
|
M. Bastero-Gil and S. F. King
|
A Next-to-Minimal Supersymmetric Model of Hybrid Inflation
|
17 pages, Latex; note added, accepted for Phys. Lett. B
|
Phys.Lett. B423 (1998) 27-34
|
10.1016/S0370-2693(98)00124-5
|
CERN-TH/97-262
|
hep-ph astro-ph
| null |
We propose a model of inflation based on a simple variant of the NMSSM,
called $\phi$NMSSM, where the additional singlet $\phi$ plays the role of the
inflaton in hybrid (or inverted hybrid) type models. As in the original NMSSM,
the $\phi$NMSSM solves the $\mu$ problem of the MSSM via the VEV of a gauge
singlet $N$, but unlike the NMSSM does not suffer from domain wall problems
since the offending $Z_3$ symmetry is replaced by an approximate Peccei-Quinn
symmetry which also solves the strong CP problem, and leads to an invisible
axion with interesting cosmological consequences. The PQ symmetry may arise
from a superstring model with an exact discrete $Z_3 \times Z_5$ symmetry after
compactification. The model predicts a spectral index $n=1$ to one part in
$10^{12}$.
|
[
{
"created": "Tue, 30 Sep 1997 10:48:39 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Feb 1998 18:44:44 GMT",
"version": "v2"
}
] |
2009-10-30
|
[
[
"Bastero-Gil",
"M.",
""
],
[
"King",
"S. F.",
""
]
] |
We propose a model of inflation based on a simple variant of the NMSSM, called $\phi$NMSSM, where the additional singlet $\phi$ plays the role of the inflaton in hybrid (or inverted hybrid) type models. As in the original NMSSM, the $\phi$NMSSM solves the $\mu$ problem of the MSSM via the VEV of a gauge singlet $N$, but unlike the NMSSM does not suffer from domain wall problems since the offending $Z_3$ symmetry is replaced by an approximate Peccei-Quinn symmetry which also solves the strong CP problem, and leads to an invisible axion with interesting cosmological consequences. The PQ symmetry may arise from a superstring model with an exact discrete $Z_3 \times Z_5$ symmetry after compactification. The model predicts a spectral index $n=1$ to one part in $10^{12}$.
|
1203.2917
|
Ricky Fok WK
|
Ricky Fok, Carol Guimaraes, Randy Lewis and Veronica Sanz
|
It is a Graviton! or maybe not
|
14 pages, 3 figures, 1 table. References added, typos corrected
| null |
10.1007/JHEP12(2012)062
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The discovery of Kaluza-Klein (KK) gravitons is a smoking gun of extra
dimensions. Other scenarios, however, could give rise to spin-two resonances of
a new strongly-coupled sector and act as impostors. In this paper we prove that
a spin-two resonance does not couple to the Standard Model through
dimension-four operators. We then show that the massive graviton and its
impostor both couple to the Standard Model through the same dimension-five
operators. Therefore the spin determination is identical. Nevertheless, we also
show that one can use the ratio of branching ratios to photons and to jets for
distinguishing between KK gravitons and their impostors. The capacity to
distinguish between KK gravitons and impostors is a manifestation of the
breakdown of the duality between AdS and strongly-coupled theories.
|
[
{
"created": "Tue, 13 Mar 2012 20:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Mar 2012 15:19:55 GMT",
"version": "v2"
}
] |
2015-06-04
|
[
[
"Fok",
"Ricky",
""
],
[
"Guimaraes",
"Carol",
""
],
[
"Lewis",
"Randy",
""
],
[
"Sanz",
"Veronica",
""
]
] |
The discovery of Kaluza-Klein (KK) gravitons is a smoking gun of extra dimensions. Other scenarios, however, could give rise to spin-two resonances of a new strongly-coupled sector and act as impostors. In this paper we prove that a spin-two resonance does not couple to the Standard Model through dimension-four operators. We then show that the massive graviton and its impostor both couple to the Standard Model through the same dimension-five operators. Therefore the spin determination is identical. Nevertheless, we also show that one can use the ratio of branching ratios to photons and to jets for distinguishing between KK gravitons and their impostors. The capacity to distinguish between KK gravitons and impostors is a manifestation of the breakdown of the duality between AdS and strongly-coupled theories.
|
1607.00505
|
Lev Dudko
|
E. Boos, V. Bunichev, L.Dudko, M. Perfilov
|
Modeling of anomalous Wtb interactions using subsidiary fields
|
arXiv admin note: substantial text overlap with arXiv:1512.00826
|
International Journal of Modern Physics A Vol. 32 (2017) 1750008
(18 pages)
|
10.1142/S0217751X17500087
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A method to simulate anomalous fermion-boson interactions in Wtb vertex is
presented with a minimal set of simulated samples of single top quark events at
the LHC energies. In proposed method additional auxiliary vector fields
corresponding to the Standard Model gauge fields are implemented for each type
of the anomalous vertex structure. The method allows to simulate a
manifestation of anomalous gauge couplings in two approaches used in
experimental analyses either keeping only the linear order contributions in the
anomalous couplings or keeping all contributions in numerators and denominators
as appeared in matrix elements. All the single top quark production mechanisms,
$t$-, $s$- and associative tW-channels are considered. The correctness of the
proposed method is demonstrated.
|
[
{
"created": "Sat, 2 Jul 2016 13:22:41 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Jul 2016 17:46:33 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Aug 2016 11:48:19 GMT",
"version": "v3"
},
{
"created": "Tue, 24 Jan 2017 17:15:50 GMT",
"version": "v4"
}
] |
2017-01-25
|
[
[
"Boos",
"E.",
""
],
[
"Bunichev",
"V.",
""
],
[
"Dudko",
"L.",
""
],
[
"Perfilov",
"M.",
""
]
] |
A method to simulate anomalous fermion-boson interactions in Wtb vertex is presented with a minimal set of simulated samples of single top quark events at the LHC energies. In proposed method additional auxiliary vector fields corresponding to the Standard Model gauge fields are implemented for each type of the anomalous vertex structure. The method allows to simulate a manifestation of anomalous gauge couplings in two approaches used in experimental analyses either keeping only the linear order contributions in the anomalous couplings or keeping all contributions in numerators and denominators as appeared in matrix elements. All the single top quark production mechanisms, $t$-, $s$- and associative tW-channels are considered. The correctness of the proposed method is demonstrated.
|
1411.6630
|
Skokov Vladimir
|
Adrian Dumitru and Vladimir Skokov
|
Anisotropy of the semi-classical gluon field of a large nucleus at high
energy
|
8 pages, 6 figures; results on JIMWLK evolution were added; version
accepted to Phys. Rev. D
|
Phys. Rev. D 91, 074006 (2015)
|
10.1103/PhysRevD.91.074006
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The McLerran-Venugopalan model describes a highly boosted hadron/nucleus as a
sheet of random color charges which source soft classical Weizs\"acker-Williams
gluon fields. We show that due to fluctuations, individual configurations are
azimuthally anisotropic. We present initial evidence that impact parameter
dependent small-x JIMWLK resummation preserves such anisotropies over several
units of rapidity. Finally, we compute the first four azimuthal Fourier
amplitudes of the S-matrix of a fundamental dipole in such background fields.
|
[
{
"created": "Mon, 24 Nov 2014 21:00:06 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Dec 2014 00:50:00 GMT",
"version": "v2"
},
{
"created": "Thu, 16 Apr 2015 00:14:38 GMT",
"version": "v3"
}
] |
2015-04-22
|
[
[
"Dumitru",
"Adrian",
""
],
[
"Skokov",
"Vladimir",
""
]
] |
The McLerran-Venugopalan model describes a highly boosted hadron/nucleus as a sheet of random color charges which source soft classical Weizs\"acker-Williams gluon fields. We show that due to fluctuations, individual configurations are azimuthally anisotropic. We present initial evidence that impact parameter dependent small-x JIMWLK resummation preserves such anisotropies over several units of rapidity. Finally, we compute the first four azimuthal Fourier amplitudes of the S-matrix of a fundamental dipole in such background fields.
|
0912.4885
|
Gilbert Moultaka
|
G. Moultaka
|
Scenarios of Gravitino Dark Matter and their Cosmological and Particle
Physics Implications
|
11 pages, 4 figures, To appear in the proceedings of Seventh
International Heidelberg Conference on Dark Matter in Astro and Particle
Physics (DARK 2009), Christchurch, New Zealand, 18-24 Jan 2009
| null |
10.1142/9789814293792_0006
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I report on some scenarios where the gravitino is the dark matter and the
supersymmetry breaking mediated by a gauge sector.
|
[
{
"created": "Thu, 24 Dec 2009 16:26:59 GMT",
"version": "v1"
}
] |
2016-11-15
|
[
[
"Moultaka",
"G.",
""
]
] |
I report on some scenarios where the gravitino is the dark matter and the supersymmetry breaking mediated by a gauge sector.
|
2002.12195
|
Shota Nakagawa
|
Shota Nakagawa, Fuminobu Takahashi, Wen Yin
|
Stochastic Axion Dark Matter in Axion Landscape
|
26 pages, 6 figures
| null |
10.1088/1475-7516/2020/05/004
|
TU-1097
|
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the stochastic axion dark matter scenario in the axion landscape,
where one of the axions is light and stable and therefore explains dark matter.
If the axion mass at the potential is a typical value of the curvature along
the direction, the potential can be well approximated by a quadratic mass term.
On the other hand, if the axion mass happens to be suppressed in the vicinity
of the minimum, the potential may be approximated by a quartic potential plus a
suppressed quadratic one, for which the initial angle, and thus the axion
abundance, can be significantly suppressed compared to the quadratic case. We
delineate the viable parameter region by taking account of various
observational constraints, and find that a broader range of the inflation scale
is allowed. Also, if the curvature of the potential is suppressed over a
certain range of the potential, the onset of coherent oscillations can be
delayed. Then, the axion dark matter with a small decay constant is possible.
We also discuss the {\pi}nflation mechanism to realize the hilltop initial
condition in the stochastic axion scenario.
|
[
{
"created": "Thu, 27 Feb 2020 15:42:10 GMT",
"version": "v1"
}
] |
2020-05-20
|
[
[
"Nakagawa",
"Shota",
""
],
[
"Takahashi",
"Fuminobu",
""
],
[
"Yin",
"Wen",
""
]
] |
We study the stochastic axion dark matter scenario in the axion landscape, where one of the axions is light and stable and therefore explains dark matter. If the axion mass at the potential is a typical value of the curvature along the direction, the potential can be well approximated by a quadratic mass term. On the other hand, if the axion mass happens to be suppressed in the vicinity of the minimum, the potential may be approximated by a quartic potential plus a suppressed quadratic one, for which the initial angle, and thus the axion abundance, can be significantly suppressed compared to the quadratic case. We delineate the viable parameter region by taking account of various observational constraints, and find that a broader range of the inflation scale is allowed. Also, if the curvature of the potential is suppressed over a certain range of the potential, the onset of coherent oscillations can be delayed. Then, the axion dark matter with a small decay constant is possible. We also discuss the {\pi}nflation mechanism to realize the hilltop initial condition in the stochastic axion scenario.
|
1609.07081
|
Michele Lucente
|
Michele Lucente
|
Implication of Sterile Fermions in Particle Physics and Cosmology
|
Ph.D. thesis, defended on 25 September 2015. Contains the results
published in arXiv:1401.1507, arXiv:1406.6556, arXiv:1503.04159,
arXiv:1507.06215 and arXiv:1508.03051
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The neutrino mass generation mechanism, the nature of dark matter and the
origin of the baryon asymmetry of the Universe are three compelling questions
that cannot be accounted for in the Standard Model of particle physics. In this
thesis we focus on all these issues by providing a possible solution in terms
of a minimal extension of the Standard Model, consisting in the addition of a
set of sterile fermions to the field content of the theory. Sterile fermions
are gauge singlet fields, that can interact via mixing with the active
neutrinos. We focus on the Inverse Seesaw mechanism, which is characterised by
a low (TeV or lower) new physics scale and that can be tested in current and
future experimental facilities. We present the model building analysis that
points towards the minimal realisations of the mechanism, and the
phenomenological study in order to accommodate light neutrino masses and to
impose all the relevant experimental constraints in the model, as well as the
expected experimental signatures. We show the viability of the sterile neutrino
hypothesis as dark matter component, together with the characteristic features
of this scenario in the minimal Inverse Seesaw mechanism. The possibility of
successfully accounting for the baryon asymmetry in a testable realisation of
the leptogenesis mechanism is also addressed. On the other hand it is important
to look for manifestations of sterile fermions in laboratory experiments. We
address this point by making predictions for the expected rates of rare lepton
number violating decays of vector bosons, that can be mediated by sterile
fermions, as well as by studying the impact of sterile fermions on global fit
of electroweak precision data.
|
[
{
"created": "Thu, 22 Sep 2016 17:39:44 GMT",
"version": "v1"
}
] |
2016-09-23
|
[
[
"Lucente",
"Michele",
""
]
] |
The neutrino mass generation mechanism, the nature of dark matter and the origin of the baryon asymmetry of the Universe are three compelling questions that cannot be accounted for in the Standard Model of particle physics. In this thesis we focus on all these issues by providing a possible solution in terms of a minimal extension of the Standard Model, consisting in the addition of a set of sterile fermions to the field content of the theory. Sterile fermions are gauge singlet fields, that can interact via mixing with the active neutrinos. We focus on the Inverse Seesaw mechanism, which is characterised by a low (TeV or lower) new physics scale and that can be tested in current and future experimental facilities. We present the model building analysis that points towards the minimal realisations of the mechanism, and the phenomenological study in order to accommodate light neutrino masses and to impose all the relevant experimental constraints in the model, as well as the expected experimental signatures. We show the viability of the sterile neutrino hypothesis as dark matter component, together with the characteristic features of this scenario in the minimal Inverse Seesaw mechanism. The possibility of successfully accounting for the baryon asymmetry in a testable realisation of the leptogenesis mechanism is also addressed. On the other hand it is important to look for manifestations of sterile fermions in laboratory experiments. We address this point by making predictions for the expected rates of rare lepton number violating decays of vector bosons, that can be mediated by sterile fermions, as well as by studying the impact of sterile fermions on global fit of electroweak precision data.
|
1810.07198
|
Ottavia Balducci
|
Ottavia Balducci, Stefan Hofmann, Alexis Kassiteridis
|
Cosmic structure formation in a flavoured U$\left(1\right)$ dark sector
at small scales
|
13 pages
| null | null | null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work we study the footprint of a secluded dark sector with a
U$\left(1\right)$ gauge symmetry on the formation of cosmic structure at small
scales. A single generation of dark fermions with mass in the TeV range is able
to elegantly solve all small-scale issues of structure formation, while still
being consistent with the cosmological history of the universe. A new
interaction at the MeV scale is introduced for this purpose. As a
generalization we consider multiple generations of fermions as well and show
that such extensions are also cosmologically viable and allow a more flexible
choice of the parameters of the theory.
|
[
{
"created": "Tue, 16 Oct 2018 18:00:08 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Jan 2021 18:34:55 GMT",
"version": "v2"
}
] |
2021-01-22
|
[
[
"Balducci",
"Ottavia",
""
],
[
"Hofmann",
"Stefan",
""
],
[
"Kassiteridis",
"Alexis",
""
]
] |
In this work we study the footprint of a secluded dark sector with a U$\left(1\right)$ gauge symmetry on the formation of cosmic structure at small scales. A single generation of dark fermions with mass in the TeV range is able to elegantly solve all small-scale issues of structure formation, while still being consistent with the cosmological history of the universe. A new interaction at the MeV scale is introduced for this purpose. As a generalization we consider multiple generations of fermions as well and show that such extensions are also cosmologically viable and allow a more flexible choice of the parameters of the theory.
|
hep-ph/9806377
|
W. Melnitchouk
|
W. Melnitchouk
|
Quark Asymmetries in the Proton
|
10 pages, 4 figures, talk given at Workshop on Future Directions in
Quark Nuclear Physics, Adelaide, March 1998
| null | null | null |
hep-ph
| null |
We review recent experimental and theoretical developments in the study of
the sea quark structure of the proton. In the light quark sector, we analyse
the recent pp and pD Drell-Yan data from the E866/NuSea experiment at Fermilab,
and their implication for the d-bar/u-bar asymmetry in the proton. The current
status of the strange content of the proton, including the possible difference
between strange and antistrange quark distributions and strangeness form
factors, is updated. Finally, we point out the ramifications of non-symmetric
charm and anticharm distributions in the nucleon for HERA event rates at large
x and Q^2.
|
[
{
"created": "Tue, 16 Jun 1998 12:15:38 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Melnitchouk",
"W.",
""
]
] |
We review recent experimental and theoretical developments in the study of the sea quark structure of the proton. In the light quark sector, we analyse the recent pp and pD Drell-Yan data from the E866/NuSea experiment at Fermilab, and their implication for the d-bar/u-bar asymmetry in the proton. The current status of the strange content of the proton, including the possible difference between strange and antistrange quark distributions and strangeness form factors, is updated. Finally, we point out the ramifications of non-symmetric charm and anticharm distributions in the nucleon for HERA event rates at large x and Q^2.
|
2110.13518
|
Tyler Corbett
|
B.C. Allanach, J. M. Butterworth, Tyler Corbett
|
Large Hadron Collider Constraints on Some Simple $Z'$ Models for $b\to
s\mu^+\mu^-$ Anomalies
|
10 pages, 10 figures, 3 tables
| null |
10.1140/epjc/s10052-021-09919-7
|
MCnet-21-13
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We examine current Large Hadron Collider constraints on some simple $Z'$
models that significantly improve on Standard Model fits to $b\to s\mu^+\mu^-$
transition data. The models that we consider are the 'third family baryon
number minus second family lepton number' $(B_3-L_2)$ model and the 'third
family hypercharge' model and variants. The constraints are applied on
parameter regions of each model that fit the $b\to s\mu^+\mu^-$ transition data
and come from high-mass Drell-Yan di-muons and measurements of Standard Model
processes. This latter set of observables place particularly strong bounds upon
the parameter space of the $B_3-L_2$ model when the mass of the $Z'$ boson is
less than 300 GeV.
|
[
{
"created": "Tue, 26 Oct 2021 09:18:40 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Nov 2021 18:00:43 GMT",
"version": "v2"
}
] |
2022-01-05
|
[
[
"Allanach",
"B. C.",
""
],
[
"Butterworth",
"J. M.",
""
],
[
"Corbett",
"Tyler",
""
]
] |
We examine current Large Hadron Collider constraints on some simple $Z'$ models that significantly improve on Standard Model fits to $b\to s\mu^+\mu^-$ transition data. The models that we consider are the 'third family baryon number minus second family lepton number' $(B_3-L_2)$ model and the 'third family hypercharge' model and variants. The constraints are applied on parameter regions of each model that fit the $b\to s\mu^+\mu^-$ transition data and come from high-mass Drell-Yan di-muons and measurements of Standard Model processes. This latter set of observables place particularly strong bounds upon the parameter space of the $B_3-L_2$ model when the mass of the $Z'$ boson is less than 300 GeV.
|
hep-ph/0502100
|
Jari Laamanen
|
Katri Huitu, Jari Laamanen, Pran N. Pandita and Sourov Roy
|
Phenomenology of non-universal gaugino masses in supersymmetric grand
unified theories
|
24 pages, uses psrfrag. Typo in Eq. (15) corrected. Added more
detailed discussion about non-universality in SUSY SU(5). Parameter space and
RGE loop level indicated more clearly. Added a few references. Version to be
published in Phys. Rev. D
|
Phys.Rev. D72 (2005) 055013
|
10.1103/PhysRevD.72.055013
| null |
hep-ph
| null |
Grand unified theories can lead to non-universal boundary conditions for the
gaugino masses at the unification scale. We consider the implications of such
non-universal boundary conditions for the composition of the lightest
neutralino as well as for the upper bound on its mass in the simplest
supersymmetric grand unified theory based on the SU(5) gauge group. We derive
sum rules for neutralino and chargino masses in different representations of
SU(5) which lead to different non-universal boundary conditions for the gaugino
masses at the unification scale. We also consider the phenomenological
implications of the non-universal gaugino masses arising from a grand unified
theory in the context of Large Hadron Collider. In particular we investigate
the detection of heavy neutral Higgs bosons $H^0, A^0$ from $H^0, A^0 \to
\tilde{\chi}_2^0 \tilde{\chi}_2^0 \to 4l $, and study the possibilities of
detecting the neutral Higgs bosons in cascade decays, including the decays
$\tilde{\chi}_i^0 \to h^0 (H^0, A^0) \tilde{\chi}_1^0 \to b\bar{b}
\tilde{\chi}_1^0$.
|
[
{
"created": "Thu, 10 Feb 2005 15:50:51 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Sep 2005 17:02:01 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Huitu",
"Katri",
""
],
[
"Laamanen",
"Jari",
""
],
[
"Pandita",
"Pran N.",
""
],
[
"Roy",
"Sourov",
""
]
] |
Grand unified theories can lead to non-universal boundary conditions for the gaugino masses at the unification scale. We consider the implications of such non-universal boundary conditions for the composition of the lightest neutralino as well as for the upper bound on its mass in the simplest supersymmetric grand unified theory based on the SU(5) gauge group. We derive sum rules for neutralino and chargino masses in different representations of SU(5) which lead to different non-universal boundary conditions for the gaugino masses at the unification scale. We also consider the phenomenological implications of the non-universal gaugino masses arising from a grand unified theory in the context of Large Hadron Collider. In particular we investigate the detection of heavy neutral Higgs bosons $H^0, A^0$ from $H^0, A^0 \to \tilde{\chi}_2^0 \tilde{\chi}_2^0 \to 4l $, and study the possibilities of detecting the neutral Higgs bosons in cascade decays, including the decays $\tilde{\chi}_i^0 \to h^0 (H^0, A^0) \tilde{\chi}_1^0 \to b\bar{b} \tilde{\chi}_1^0$.
|
hep-ph/9811216
|
Yu-Ping Kuang
|
Xue-Lei Wang, Yu-Ping Kuang, Hong-yi Zhou, Hua Wang, Ling Zhang
|
Single top Quark Production in e-gamma Collisions and Testing
Technicolor Models
|
15-page RevTex file with 7 figure using epsfig. Version for
publication in Phys. Rev. D
|
Phys.Rev. D60 (1999) 014002
|
10.1103/PhysRevD.60.014002
|
TUIMP-TH-98/91
|
hep-ph
| null |
We study the single top quark production process in various kinds of
technicolor models in high energy positron photon collisions at the future
electron positron linear colliders. It is shown that if there is certain
charged pseudo Goldstone boson (PGB) coupling to t(anti-b), the
t(anti-b)-channel PGB contribution is dominant, but the situation is quite
different from that in the neutral channel, t(anti-t) production in photon
photon collisions, due to the destructive nature of different amplitudes. At
the DESY limear collider TESLA, the event rates in models with
t(anti-b)-channel PGB contributions, such as the top-color-assisted technicolor
model, etc. are experimentally measurable. This process provides a feasible
test of technicolor models with t(abti-b)-channel PGB contributions.
|
[
{
"created": "Mon, 2 Nov 1998 15:21:15 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Mar 1999 08:17:14 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Wang",
"Xue-Lei",
""
],
[
"Kuang",
"Yu-Ping",
""
],
[
"Zhou",
"Hong-yi",
""
],
[
"Wang",
"Hua",
""
],
[
"Zhang",
"Ling",
""
]
] |
We study the single top quark production process in various kinds of technicolor models in high energy positron photon collisions at the future electron positron linear colliders. It is shown that if there is certain charged pseudo Goldstone boson (PGB) coupling to t(anti-b), the t(anti-b)-channel PGB contribution is dominant, but the situation is quite different from that in the neutral channel, t(anti-t) production in photon photon collisions, due to the destructive nature of different amplitudes. At the DESY limear collider TESLA, the event rates in models with t(anti-b)-channel PGB contributions, such as the top-color-assisted technicolor model, etc. are experimentally measurable. This process provides a feasible test of technicolor models with t(abti-b)-channel PGB contributions.
|
1810.06270
|
Ratan Sarkar
|
B. Ananthanarayan, Abhishek Pal, S. Ramanan, Ratan Sarkar
|
Unveiling Regions in multi-scale Feynman Integrals using Singularities
and Power Geometry
|
v2,29 pages, plain latex, 12 figures, 3 tables, mathematica programs
given as ancillary files,corresponds to version to appear in European
Physical Journal C; compared to v1, sign of U polynomial corrected everywhere
and in the new notebooks. The sign did not alter any of the results.
Extensive discussions added, and clarifications inserted. Reference added
| null |
10.1140/epjc/s10052-019-6533-x
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce a novel approach for solving the problem of identifying regions
in the framework of Method of Regions by considering singularities and the
associated Landau equations given a multi-scale Feynman diagram. These
equations are then analyzed by an expansion in a small threshold parameter via
the Power Geometry technique. This effectively leads to the analysis of Newton
Polytopes which are evaluated using a Mathematica based convex hull program.
Furthermore, the elements of the Gr\"{o}bner Basis of the Landau Equations give
a family of transformations, which when applied, reveal regions like potential
and Glauber. Several one-loop and two-loop examples are studied and benchmarked
using our algorithm which we call ASPIRE.
|
[
{
"created": "Mon, 15 Oct 2018 11:06:07 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jan 2019 09:59:04 GMT",
"version": "v2"
}
] |
2019-02-20
|
[
[
"Ananthanarayan",
"B.",
""
],
[
"Pal",
"Abhishek",
""
],
[
"Ramanan",
"S.",
""
],
[
"Sarkar",
"Ratan",
""
]
] |
We introduce a novel approach for solving the problem of identifying regions in the framework of Method of Regions by considering singularities and the associated Landau equations given a multi-scale Feynman diagram. These equations are then analyzed by an expansion in a small threshold parameter via the Power Geometry technique. This effectively leads to the analysis of Newton Polytopes which are evaluated using a Mathematica based convex hull program. Furthermore, the elements of the Gr\"{o}bner Basis of the Landau Equations give a family of transformations, which when applied, reveal regions like potential and Glauber. Several one-loop and two-loop examples are studied and benchmarked using our algorithm which we call ASPIRE.
|
hep-ph/0311063
|
Bronislav Zakharov
|
B.G. Zakharov
|
Description of the CERN SPS data on the Landau-Pomeranchuk-Migdal effect
for photon bremsstrahlung in quantum regime
|
8 pages, 1 figure
|
JETP Lett. 78 (2003) 759-762; Pisma Zh.Eksp.Teor.Fiz. 78 (2003)
1279-1282
|
10.1134/1.1663999
| null |
hep-ph
| null |
We analyze within the light-cone path integral approach [4] the recent CERN
SPS data [19] on the Landau-Pomeranchuk-Migdal effect for photon bremsstrahlung
in quantum regime from 149, 207, and 287 GeV electrons. Calculations have been
carried out treating accurately the Coulomb effects and including the inelastic
processes. Comparison with experiment is performed accounting for multi-photon
emission. Our results are in good agreement with the data.
|
[
{
"created": "Wed, 5 Nov 2003 16:01:07 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Zakharov",
"B. G.",
""
]
] |
We analyze within the light-cone path integral approach [4] the recent CERN SPS data [19] on the Landau-Pomeranchuk-Migdal effect for photon bremsstrahlung in quantum regime from 149, 207, and 287 GeV electrons. Calculations have been carried out treating accurately the Coulomb effects and including the inelastic processes. Comparison with experiment is performed accounting for multi-photon emission. Our results are in good agreement with the data.
|
hep-ph/0310337
|
Anton Rebhan
|
Ulrike Kraemmer, Anton Rebhan
|
Advances in perturbative thermal field theory
|
84 pages, 18 figues, review article submitted to Reports on Progress
in Physics; v2, v3: minor additions and corrections, more references
|
Rept.Prog.Phys.67:351,2004
|
10.1088/0034-4885/67/3/R05
|
TUW 03-32
|
hep-ph hep-th nucl-th
| null |
The progress of the last decade in perturbative quantum field theory at high
temperature and density made possible by the use of effective field theories
and hard-thermal/dense-loop resummations in ultrarelativistic gauge theories is
reviewed. The relevant methods are discussed in field theoretical models from
simple scalar theories to non-Abelian gauge theories including gravity. In the
simpler models, the aim is to give a pedagogical account of some of the
relevant problems and their resolution, while in the more complicated but also
more interesting models such as quantum chromodynamics, a summary of the
results obtained so far are given together with references to a few most recent
developments and open problems.
|
[
{
"created": "Thu, 30 Oct 2003 16:10:11 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Nov 2003 14:38:43 GMT",
"version": "v2"
},
{
"created": "Sun, 18 Jan 2004 17:17:34 GMT",
"version": "v3"
}
] |
2010-01-15
|
[
[
"Kraemmer",
"Ulrike",
""
],
[
"Rebhan",
"Anton",
""
]
] |
The progress of the last decade in perturbative quantum field theory at high temperature and density made possible by the use of effective field theories and hard-thermal/dense-loop resummations in ultrarelativistic gauge theories is reviewed. The relevant methods are discussed in field theoretical models from simple scalar theories to non-Abelian gauge theories including gravity. In the simpler models, the aim is to give a pedagogical account of some of the relevant problems and their resolution, while in the more complicated but also more interesting models such as quantum chromodynamics, a summary of the results obtained so far are given together with references to a few most recent developments and open problems.
|
1007.5443
|
Andrea Lionetto
|
F. Fucito, A. Lionetto, A. Racioppi and D. Ricci Pacifici
|
A Phenomenological study on the wino radiative decay in anomalous
$U(1)'$ models
|
4 pages, 6 figures, elsarticle class
|
Phys.Rev.D82:115004,2010
|
10.1103/PhysRevD.82.115004
|
RM2F/2010/14
|
hep-ph hep-ex hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An extension of the Standard Model by at least one extra U(1) gauge symmetry
has been investigated by many authors. In this paper we explore the possibility
that this extra U(1) is anomalous. One of the possible signatures of this model
could be given by the photons produced in the decays of the NLSP into the LSP.
|
[
{
"created": "Fri, 30 Jul 2010 13:27:36 GMT",
"version": "v1"
}
] |
2010-12-24
|
[
[
"Fucito",
"F.",
""
],
[
"Lionetto",
"A.",
""
],
[
"Racioppi",
"A.",
""
],
[
"Pacifici",
"D. Ricci",
""
]
] |
An extension of the Standard Model by at least one extra U(1) gauge symmetry has been investigated by many authors. In this paper we explore the possibility that this extra U(1) is anomalous. One of the possible signatures of this model could be given by the photons produced in the decays of the NLSP into the LSP.
|
1501.01530
|
Hiroshi Okada
|
Seungwon Baek, Hiroshi Okada, Kei Yagyu
|
Flavour Dependent Gauged Radiative Neutrino Mass Model
|
15 pages, 1 figure, 2 tables
| null |
10.1007/JHEP04(2015)049
|
KIAS-P15001
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a one-loop induced radiative neutrino mass model with anomaly free
flavour dependent gauge symmetry: $\mu$ minus $\tau$ symmetry
$U(1)_{\mu-\tau}$. A neutrino mass matrix satisfying current experimental data
can be obtained by introducing a weak isospin singlet scalar boson that breaks
$U(1)_{\mu-\tau}$ symmetry, an inert doublet scalar field, and three
right-handed neutrinos in addition to the fields in the standard model. We find
that a characteristic structure appears in the neutrino mass matrix: two-zero
texture form which predicts three non-zero neutrino masses and three non-zero
CP-phases from five well measured experimental inputs of two squared mass
differences and three mixing angles. Furthermore, it is clarified that only the
inverted mass hierarchy is allowed in our model. In a favored parameter set
from the neutrino sector, the discrepancy in the muon anomalous magnetic moment
between the experimental data and the the standard model prediction can be
explained by the additional neutral gauge boson loop contribution with mass of
order 100 MeV and new gauge coupling of order $10^{-3}$.
|
[
{
"created": "Wed, 7 Jan 2015 15:46:37 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Jan 2015 00:58:48 GMT",
"version": "v2"
},
{
"created": "Fri, 6 Mar 2015 02:51:19 GMT",
"version": "v3"
}
] |
2015-06-23
|
[
[
"Baek",
"Seungwon",
""
],
[
"Okada",
"Hiroshi",
""
],
[
"Yagyu",
"Kei",
""
]
] |
We propose a one-loop induced radiative neutrino mass model with anomaly free flavour dependent gauge symmetry: $\mu$ minus $\tau$ symmetry $U(1)_{\mu-\tau}$. A neutrino mass matrix satisfying current experimental data can be obtained by introducing a weak isospin singlet scalar boson that breaks $U(1)_{\mu-\tau}$ symmetry, an inert doublet scalar field, and three right-handed neutrinos in addition to the fields in the standard model. We find that a characteristic structure appears in the neutrino mass matrix: two-zero texture form which predicts three non-zero neutrino masses and three non-zero CP-phases from five well measured experimental inputs of two squared mass differences and three mixing angles. Furthermore, it is clarified that only the inverted mass hierarchy is allowed in our model. In a favored parameter set from the neutrino sector, the discrepancy in the muon anomalous magnetic moment between the experimental data and the the standard model prediction can be explained by the additional neutral gauge boson loop contribution with mass of order 100 MeV and new gauge coupling of order $10^{-3}$.
|
hep-ph/9910533
|
Gomez Nicola
|
A. Gomez Nicola
|
Nonequilibrium chiral perturbation theory and disoriented chiral
condensates
|
Talk given in ``Hadron Physics: Effective Theories of Low Energy
QCD'', Coimbra, Portugal, Sept. 10-15 1999. Uses aipproc.sty, available at
ftp://ftp.aip.org/ems/tex/macros/proceedings/6x9
| null | null | null |
hep-ph
| null |
We analyse the extension of Chiral Perturbation Theory to describe a meson
gas out of thermal equilibrium. For that purpose, we let the pion decay
constant be a time-dependent function and work within the Schwinger-Keldysh
contour technique. A useful connection with curved space-time QFT allows to
consistently renormalise the model, introducing two new low-energy constants in
the chiral limit.
We discuss the applicability of our approach within a Relativistic Heavy-Ion
Collision environment. In particular, we investigate the formation of
Disoriented Chiral Condensate domains in this model, via the parametric
resonance mechanism.
|
[
{
"created": "Thu, 28 Oct 1999 15:54:33 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Nicola",
"A. Gomez",
""
]
] |
We analyse the extension of Chiral Perturbation Theory to describe a meson gas out of thermal equilibrium. For that purpose, we let the pion decay constant be a time-dependent function and work within the Schwinger-Keldysh contour technique. A useful connection with curved space-time QFT allows to consistently renormalise the model, introducing two new low-energy constants in the chiral limit. We discuss the applicability of our approach within a Relativistic Heavy-Ion Collision environment. In particular, we investigate the formation of Disoriented Chiral Condensate domains in this model, via the parametric resonance mechanism.
|
hep-ph/9808408
| null |
W. Hollik (1), J.I. Illana (1), S. Rigolin (2), C. Schappacher (1) and
D. St\"ockinger (1) ((1) U. Karlsruhe, (2) U. Autonoma Madrid)
|
Dipole Form Factors and Loop-induced CP-violation in Supersymmetry
|
68 pages, 17 figures. LaTeX using epsf.sty. Eqs. (61,66,67)
corrected. Labels `N' and `T' exchanged in Tables 5,6. Tables 6,7 and Figure
15 revised
| null |
10.1016/S0550-3213(99)00396-X
|
KA-TP-10-1998
|
hep-ph
| null |
The one-loop Minimal Supersymmetric Standard Model (MSSM) contributions to
the weak and electromagnetic dipole form factors of heavy fermions are
reviewed. For the $Z$ boson on shell, the weak-magnetic and weak-electric
dipole moments of the $\tau$ lepton and the $b$ quark can be defined and
directly connected to observables. But far from the $Z$ peak, the weak and
electromagnetic dipole form factors are not enough to account for all the new
physics effects. In the context of the calculation of the process $e^+e^-\to
t\bar{t}$ to one loop in the MSSM, we compare the impact on the phenomenology
of the CP-violating dipole form factors of the top quark with the contribution
from CP-violating box graphs. Some exemplificative observables are analyzed and
the relevance of both the contributions is pointed out. The set of tensor
integrals employed, the one-loop expressions for the electromagnetic and weak
dipole form factors in a general renormalizable theory and the SM and MSSM
couplings and conventions are also given.
|
[
{
"created": "Tue, 25 Aug 1998 19:20:39 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Oct 2001 11:19:59 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Hollik",
"W.",
"",
"U. Karlsruhe"
],
[
"Illana",
"J. I.",
"",
"U. Karlsruhe"
],
[
"Rigolin",
"S.",
"",
"U. Autonoma Madrid"
],
[
"Schappacher",
"C.",
"",
"U. Karlsruhe"
],
[
"Stöckinger",
"D.",
"",
"U. Karlsruhe"
]
] |
The one-loop Minimal Supersymmetric Standard Model (MSSM) contributions to the weak and electromagnetic dipole form factors of heavy fermions are reviewed. For the $Z$ boson on shell, the weak-magnetic and weak-electric dipole moments of the $\tau$ lepton and the $b$ quark can be defined and directly connected to observables. But far from the $Z$ peak, the weak and electromagnetic dipole form factors are not enough to account for all the new physics effects. In the context of the calculation of the process $e^+e^-\to t\bar{t}$ to one loop in the MSSM, we compare the impact on the phenomenology of the CP-violating dipole form factors of the top quark with the contribution from CP-violating box graphs. Some exemplificative observables are analyzed and the relevance of both the contributions is pointed out. The set of tensor integrals employed, the one-loop expressions for the electromagnetic and weak dipole form factors in a general renormalizable theory and the SM and MSSM couplings and conventions are also given.
|
hep-ph/9808429
|
Stefano Moretti
|
Stefano Moretti (RAL, UK) and W.J. Stirling (Durham, UK)
|
Spin correlations in $e^+e^-\to 4 jets$
|
33 pages, latex, epsfig, 8 figures (bitmapped at 75dpi, full paper at
high resolution available at http://www.hep.phy.cam.ac.uk/theory/papers/),
discussion made more quantitative, final version to appear in Eur. Phys. J. C
|
Eur.Phys.J.C9:81-93,1999
|
10.1007/s100529900016
|
RAL-TR-1998-037, DTP/98/32, Cavendish-HEP-97/12
|
hep-ph
| null |
Existence of discrepancies between experimental data and Monte Carlo
predictions for angular distributions in four-jet production via $e^+e^-$
annihilation has been known for some time at LEP1. As such QCD processes
constitute significant backgrounds to $e^+e^-\to W^+W^-\to 4$-jet production at
LEP2, we consider the possibility that an erroneous modelling of the helicity
structure of the final-state partons could affect the accuracy of experimental
measurements of the $W^\pm$ boson parameters
|
[
{
"created": "Wed, 26 Aug 1998 17:59:39 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Aug 1998 08:38:46 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Jan 1999 13:36:15 GMT",
"version": "v3"
}
] |
2011-09-13
|
[
[
"Moretti",
"Stefano",
"",
"RAL, UK"
],
[
"Stirling",
"W. J.",
"",
"Durham, UK"
]
] |
Existence of discrepancies between experimental data and Monte Carlo predictions for angular distributions in four-jet production via $e^+e^-$ annihilation has been known for some time at LEP1. As such QCD processes constitute significant backgrounds to $e^+e^-\to W^+W^-\to 4$-jet production at LEP2, we consider the possibility that an erroneous modelling of the helicity structure of the final-state partons could affect the accuracy of experimental measurements of the $W^\pm$ boson parameters
|
hep-ph/0212251
|
Cristina Manuel
|
Cristina Manuel
|
QCD Effective Actions at High Temperature and the Quasiparticle Picture
|
5 pages, talk given at SEWM2002, Heidelberg, October 2002
| null |
10.1142/9789812704498_0055
|
IFIC/02-64
|
hep-ph
| null |
Transport theory is an efficient approach to derive an effective theory for
the soft modes of QCD at high temperature. It is known that the leading order
operators of this theory can be obtained from (semi-classical) kinetic
equations of quasiparticles carrying classical or quantum color charges. Higher
order operators can also be obtained. Discrepancy between these quasiparticle
models starts for dimension 4 operators, which converge in the limit of high
dimensional color representations. These quasiparticle models are reviewed and
compared.
|
[
{
"created": "Tue, 17 Dec 2002 15:40:37 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Manuel",
"Cristina",
""
]
] |
Transport theory is an efficient approach to derive an effective theory for the soft modes of QCD at high temperature. It is known that the leading order operators of this theory can be obtained from (semi-classical) kinetic equations of quasiparticles carrying classical or quantum color charges. Higher order operators can also be obtained. Discrepancy between these quasiparticle models starts for dimension 4 operators, which converge in the limit of high dimensional color representations. These quasiparticle models are reviewed and compared.
|
1004.0942
|
Andrew Long
|
Daniel J. H. Chung and Andrew J. Long
|
Electroweak Phase Transition in the munuSSM
|
36 pages, 10 figures
|
Phys.Rev.D81:123531,2010
|
10.1103/PhysRevD.81.123531
| null |
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An extension of the MSSM called the munuSSM does not allow a conventional
thermal leptogenesis scenario because of the low scale seesaw that it utilizes.
Hence, we investigate the possibility of electroweak baryogenesis.
Specifically, we identify a parameter region for which the electroweak phase
transition is sufficiently strongly first order to realize electroweak
baryogenesis. In addition to transitions that are similar to those in the
NMSSM, we find a novel class of phase transitions in which there is a rotation
in the singlet vector space.
|
[
{
"created": "Tue, 6 Apr 2010 19:46:55 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Sep 2010 18:07:15 GMT",
"version": "v2"
}
] |
2015-03-14
|
[
[
"Chung",
"Daniel J. H.",
""
],
[
"Long",
"Andrew J.",
""
]
] |
An extension of the MSSM called the munuSSM does not allow a conventional thermal leptogenesis scenario because of the low scale seesaw that it utilizes. Hence, we investigate the possibility of electroweak baryogenesis. Specifically, we identify a parameter region for which the electroweak phase transition is sufficiently strongly first order to realize electroweak baryogenesis. In addition to transitions that are similar to those in the NMSSM, we find a novel class of phase transitions in which there is a rotation in the singlet vector space.
|
hep-ph/0207077
|
Carsten Vogt
|
C. Vogt
|
The Handbag Contribution to Two-Photon Annihilation Into Meson Pairs
|
6 pages, 4 figures, uses ws-procs9x6.cls. Talk presented at workshops
QCD-N'02, Ferrara, Italy, April 3-6, and Exclusive Processes at High Momentum
Transfer, Jefferson Lab, Newport News, VA, USA, May 15-18, 2002
|
Nucl.Phys. A711 (2002) 215-218
|
10.1016/S0375-9474(02)01220-4
|
NORDITA-2002-37 HE
|
hep-ph
| null |
We report on the handbag contribution to two-photon annihilation into pion
and kaon pairs at large energy and momentum transfer. The underlying physics of
the mechanism is outlined and characteristic features and predictions are
presented.
|
[
{
"created": "Thu, 4 Jul 2002 18:33:53 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Vogt",
"C.",
""
]
] |
We report on the handbag contribution to two-photon annihilation into pion and kaon pairs at large energy and momentum transfer. The underlying physics of the mechanism is outlined and characteristic features and predictions are presented.
|
2206.06519
|
Andrew Eberhardt
|
Andrew Eberhardt, Michael Kopp, Tom Abel
|
When quantum corrections alter the predictions of classical field theory
for scalar field dark matter
|
to be submitted to Phys Rev D
| null |
10.1103/PhysRevD.106.103002
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We investigate the timescale on which quantum corrections alter the
predictions of classical field theory for scalar field dark matter. This is
accomplished by including second order terms in the evolution proportional to
the covariance of the field operators. When this covariance is no longer small
compared to the mean field value, we say that the system has reached the
``quantum breaktime" and the predictions of classical field theory will begin
to differ from those of the full quantum theory. While holding the classical
field theory evolution fixed, we determine the change of the quantum breaktime
as total occupation number is increased. This provides a novel numerical
estimation of the breaktime based at high occupations $n_{tot}$ and mode number
$N=256$. We study the collapse of a sinusoidal overdensity in a single spatial
dimension. We find that the breaktime scales as $\log(n_{tot})$ prior to shell
crossing and then then as a powerlaw following the collapse. If we assume that
the collapsing phase is representative of halos undergoing nonlinear growth,
this implies that the quantum breaktime of typical systems may be as large as
$\sim 30$ of dynamical times even at occupations of $n_{tot}\sim 10^{100}$.
|
[
{
"created": "Mon, 13 Jun 2022 23:31:19 GMT",
"version": "v1"
}
] |
2022-11-16
|
[
[
"Eberhardt",
"Andrew",
""
],
[
"Kopp",
"Michael",
""
],
[
"Abel",
"Tom",
""
]
] |
We investigate the timescale on which quantum corrections alter the predictions of classical field theory for scalar field dark matter. This is accomplished by including second order terms in the evolution proportional to the covariance of the field operators. When this covariance is no longer small compared to the mean field value, we say that the system has reached the ``quantum breaktime" and the predictions of classical field theory will begin to differ from those of the full quantum theory. While holding the classical field theory evolution fixed, we determine the change of the quantum breaktime as total occupation number is increased. This provides a novel numerical estimation of the breaktime based at high occupations $n_{tot}$ and mode number $N=256$. We study the collapse of a sinusoidal overdensity in a single spatial dimension. We find that the breaktime scales as $\log(n_{tot})$ prior to shell crossing and then then as a powerlaw following the collapse. If we assume that the collapsing phase is representative of halos undergoing nonlinear growth, this implies that the quantum breaktime of typical systems may be as large as $\sim 30$ of dynamical times even at occupations of $n_{tot}\sim 10^{100}$.
|
1301.1839
|
Raktim Abir
|
Raktim Abir
|
Jet-parton inelastic interaction beyond eikonal approximation
|
7 pages, 5 figures, version published in Phys. Rev. D
|
Phys. Rev. D 87, 034036 (2013)
|
10.1103/PhysRevD.87.034036
| null |
hep-ph
|
http://creativecommons.org/licenses/by/3.0/
|
Most of the models of jet quenching generally assumes that a jet always
travels in a straight eikonal path, which is indeed true for sufficiently hard
jet but may not be a good one for moderate and low momentum jet. In this
article an attempt has been made to relax part of this approximation for 2 -->
3 processes and found a (15-20)% suppression in the differential cross-section
for moderately hard jets because of the noneikonal effects. In particular, for
the process qq' --> qq'g in the centre of momentum frame the scattering with an
angle wider than \pm 0.52\pi, is literally forbidden unlike the process gg -->
ggg that allows an angular range \pm \pi. This may have consequence on the
suppression of hadronic spectra at low transverse momenta.
|
[
{
"created": "Wed, 9 Jan 2013 13:00:11 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Feb 2013 14:26:40 GMT",
"version": "v2"
}
] |
2013-02-27
|
[
[
"Abir",
"Raktim",
""
]
] |
Most of the models of jet quenching generally assumes that a jet always travels in a straight eikonal path, which is indeed true for sufficiently hard jet but may not be a good one for moderate and low momentum jet. In this article an attempt has been made to relax part of this approximation for 2 --> 3 processes and found a (15-20)% suppression in the differential cross-section for moderately hard jets because of the noneikonal effects. In particular, for the process qq' --> qq'g in the centre of momentum frame the scattering with an angle wider than \pm 0.52\pi, is literally forbidden unlike the process gg --> ggg that allows an angular range \pm \pi. This may have consequence on the suppression of hadronic spectra at low transverse momenta.
|
0909.5441
|
Maxim Chernodub
|
M. N. Chernodub, A. D'Alessandro, M. D'Elia, V. I. Zakharov
|
Thermal monopoles and selfdual dyons in the Quark-Gluon Plasma
|
9 pages, 4 figures, RevTeX 4.0
| null | null |
ITEP-LAT/2009-11, GEF-TH 10/09
|
hep-ph hep-lat hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a numerical study of the excess of non-abelian gauge invariant
gluonic action around thermal abelian monopoles which populate the deconfined
phase of Yang-Mills theories. Our results show that the excess of magnetic
action is close to that of the electric one, so that thermal abelian monopoles
may be associated with physical objects carrying both electric and magnetic
charge, i.e. dyons. Thus, the quark gluon plasma is likely to be populated by
selfdual dyons, which may manifest themselves in the heavy-ion collisions via
the chiral magnetic effect. Thermodynamically, thermal monopoles provide a
negative contribution to the pressure of the system.
|
[
{
"created": "Tue, 29 Sep 2009 20:51:46 GMT",
"version": "v1"
}
] |
2009-10-04
|
[
[
"Chernodub",
"M. N.",
""
],
[
"D'Alessandro",
"A.",
""
],
[
"D'Elia",
"M.",
""
],
[
"Zakharov",
"V. I.",
""
]
] |
We perform a numerical study of the excess of non-abelian gauge invariant gluonic action around thermal abelian monopoles which populate the deconfined phase of Yang-Mills theories. Our results show that the excess of magnetic action is close to that of the electric one, so that thermal abelian monopoles may be associated with physical objects carrying both electric and magnetic charge, i.e. dyons. Thus, the quark gluon plasma is likely to be populated by selfdual dyons, which may manifest themselves in the heavy-ion collisions via the chiral magnetic effect. Thermodynamically, thermal monopoles provide a negative contribution to the pressure of the system.
|
hep-ph/0308209
|
Dmitry Anipko A.
|
D. Anipko, S. Eidelman, A. Pak
|
Monte-Carlo Simulation of Exclusive Channels in e+e- Annihilation at Low
Energy
|
Poster presentation at the XXIII Physics in Collisions Conference
(PIC03), Zeuthen, Germany, June 2003, 3 pages, LaTeX, 2 eps figures. PSN
FRAP06
| null | null | null |
hep-ph
| null |
Software package for Monte-Carlo simulation of e+e- exclusive annihilation
channels written in the C++ language for Linux/Solaris platforms has been
developed. It incorporates matrix elements for several mechanisms of multipion
production in a model of consequent two and three-body resonance decays.
Possible charge states of intermediate and final particles are accounted
automatically under the assumption of isospin conservation. Interference
effects can be taken into acccount. Package structure allows adding new matrix
elements written in a gauge-invariant form.
|
[
{
"created": "Wed, 20 Aug 2003 14:34:14 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Dec 2003 08:46:32 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Anipko",
"D.",
""
],
[
"Eidelman",
"S.",
""
],
[
"Pak",
"A.",
""
]
] |
Software package for Monte-Carlo simulation of e+e- exclusive annihilation channels written in the C++ language for Linux/Solaris platforms has been developed. It incorporates matrix elements for several mechanisms of multipion production in a model of consequent two and three-body resonance decays. Possible charge states of intermediate and final particles are accounted automatically under the assumption of isospin conservation. Interference effects can be taken into acccount. Package structure allows adding new matrix elements written in a gauge-invariant form.
|
hep-ph/0310072
|
Damir Becirevic
|
Damir Becirevic
|
Status of the computation of fBs, fBd, xi and g
|
11 pages, 6 figures, Invited talk at the Workshop on the CKM
Unitarity Triangle, IPPP Durham, April 2003 [2 refs.added & a few typos
corrected]
| null | null |
Orsay,03-71
|
hep-ph hep-ex hep-lat
| null |
Current status of the computation of the neutral B-meson mixing amplitudes,
with particular attention to the heavy-light meson decay constants, is
reviewed. The values for these quantities, as well as for the coupling of the
pion to the lowest doublet of heavy-light mesons, are given.
|
[
{
"created": "Mon, 6 Oct 2003 17:21:12 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Nov 2003 12:00:09 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Becirevic",
"Damir",
""
]
] |
Current status of the computation of the neutral B-meson mixing amplitudes, with particular attention to the heavy-light meson decay constants, is reviewed. The values for these quantities, as well as for the coupling of the pion to the lowest doublet of heavy-light mesons, are given.
|
2109.03831
|
Nicol\`o Foppiani
|
Carlos A. Arg\"uelles, Nicol\`o Foppiani, Matheus Hostert
|
Heavy neutral leptons below the kaon mass at hodoscopic detectors
|
15 pages, 11 figures Several typos were fixed, and references were
added. The work has been expanded to discuss a leptophilic axion-like
particle portal model that could explain the MiniBooNE excess
| null |
10.1103/PhysRevD.105.095006
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Heavy neutral leptons ($N$) below the kaon mass are severely constrained by
cosmology and lab-based searches for their decays in flight. If $N$ interacts
via an additional force, $N\to\nu e^+e^-$ decays are enhanced and cosmological
limits can be avoided. We show that the T2K and MicroBooNE neutrino experiments
provide the best limits on the mixing of $N$ with muon-neutrinos, outperforming
past-generation experiments, previously thought to dominate. We constrain
models with electromagnetically-decaying and long-lived $N$, such as in a
transition-magnetic-moment portal and in a leptophilic axion-like particle
portal, invoked to explain the MiniBooNE excess. By considering these models as
representative examples, our results show that explanations of the MiniBooNE
excess that involve $e^+e^-$ pairs from long-lived particles are in tension
with T2K, PS191, and MicroBooNE data. Similarly, these searches also constrain
MiniBooNE explanations based on single photons due to the associated $e^+e^-$
decay mode via a virtual photon.
|
[
{
"created": "Wed, 8 Sep 2021 18:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Mar 2022 00:24:11 GMT",
"version": "v2"
}
] |
2022-05-25
|
[
[
"Argüelles",
"Carlos A.",
""
],
[
"Foppiani",
"Nicolò",
""
],
[
"Hostert",
"Matheus",
""
]
] |
Heavy neutral leptons ($N$) below the kaon mass are severely constrained by cosmology and lab-based searches for their decays in flight. If $N$ interacts via an additional force, $N\to\nu e^+e^-$ decays are enhanced and cosmological limits can be avoided. We show that the T2K and MicroBooNE neutrino experiments provide the best limits on the mixing of $N$ with muon-neutrinos, outperforming past-generation experiments, previously thought to dominate. We constrain models with electromagnetically-decaying and long-lived $N$, such as in a transition-magnetic-moment portal and in a leptophilic axion-like particle portal, invoked to explain the MiniBooNE excess. By considering these models as representative examples, our results show that explanations of the MiniBooNE excess that involve $e^+e^-$ pairs from long-lived particles are in tension with T2K, PS191, and MicroBooNE data. Similarly, these searches also constrain MiniBooNE explanations based on single photons due to the associated $e^+e^-$ decay mode via a virtual photon.
|
0910.5762
|
Masashi Wakamatsu
|
M. Wakamatsu and H. Tsujimoto
|
Can the Feynman-Hellmann theorem be used to separate the connected- and
disconnected-diagram contributions to the nucleon sigma term ?
|
17 pages, 1 figure, 1 table
| null | null |
OU-HET-645
|
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In recent lattice QCD studies, the Feynman-Hellmann theorem is often used to
estimate separate contributions of the connected and disconnected diagrams to
the nucleon sigma term. We demonstrate through a simple analysis within an
effective model of QCD why this could be dangerous although the theorem is
naturally expected to hold for the sum of the two contributions, i.e. the net
nucleon sigma term.
|
[
{
"created": "Fri, 30 Oct 2009 00:48:56 GMT",
"version": "v1"
}
] |
2009-11-02
|
[
[
"Wakamatsu",
"M.",
""
],
[
"Tsujimoto",
"H.",
""
]
] |
In recent lattice QCD studies, the Feynman-Hellmann theorem is often used to estimate separate contributions of the connected and disconnected diagrams to the nucleon sigma term. We demonstrate through a simple analysis within an effective model of QCD why this could be dangerous although the theorem is naturally expected to hold for the sum of the two contributions, i.e. the net nucleon sigma term.
|
hep-ph/0112056
|
Alexei P. Martynenko
|
R.N.Faustov (Moscow, Cybernetics Council), A.P.Martynenko (Samara
State U.)
|
One-loop corrections of order (Z alpha)^6m_1/m_2, (Z alpha)^7 to the
muonium fine structure
|
Talk given at the XVIth International Workshop High-Energy Physics
and Quantum Field Theory (QFTHEP2001), Moscow, Russia, 6-12 Sep 2001, 12
pages, REVTEX
|
Phys.Atom.Nucl. 66 (2003) 1719-1729; Yad.Fiz. 66 (2003) 1767-1777
|
10.1134/1.1611588
|
SSU-HEP-01-09
|
hep-ph
| null |
The corrections of order (Z alpha)^6m_1/m_2 and (Z alpha)^7 from one-loop
two-photon exchange diagrams to the energy spectra of the hydrogenic atoms are
calculated with the help of the Taylor expansion of corresponding integrands.
The method of averaging the quasipotential over the wave functions in the
d-dimensional coordinate space is formulated. The numerical values of the
obtained contributions to the fine structure of muonium, hydrogen and
positronium are presented.
|
[
{
"created": "Tue, 4 Dec 2001 16:17:38 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Dec 2002 12:39:59 GMT",
"version": "v2"
}
] |
2015-06-25
|
[
[
"Faustov",
"R. N.",
"",
"Moscow, Cybernetics Council"
],
[
"Martynenko",
"A. P.",
"",
"Samara\n State U."
]
] |
The corrections of order (Z alpha)^6m_1/m_2 and (Z alpha)^7 from one-loop two-photon exchange diagrams to the energy spectra of the hydrogenic atoms are calculated with the help of the Taylor expansion of corresponding integrands. The method of averaging the quasipotential over the wave functions in the d-dimensional coordinate space is formulated. The numerical values of the obtained contributions to the fine structure of muonium, hydrogen and positronium are presented.
|
1804.04525
|
Kazem Azizi
|
H. Sundu, B. Barsbay, S. S. Agaev, K. Azizi
|
Probing an axial-vector tetraquark $Z_s$ via its semileptonic decay $Z_s
\to X(4274)\overline{l} \nu_l$
|
8 Pages, 3 Figures and 1 Table
| null |
10.1140/epja/i2018-12552-0
| null |
hep-ph hep-ex hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The semileptonic decays of the open charm-bottom axial-vector tetraquark $
Z_{s}=[cs][\overline{b}\overline{s}]$ to $X(4274)\overline{l} \nu_l$, $l=e,
\mu, \tau $ are explored by means of the QCD three-point sum rule method. Both
$Z_{s}$ and $X(4274)=[cs][\overline{c}\overline{s}]$ are treated as color
sextet diquark-antidiquark states. The full width of the decays $Z_s \to
X(4274)\overline{l} \nu_l$ is found. Obtained predictions for $ \Gamma(Z_s \to
X(4274)\overline{l} \nu_l)$ demonstrate that, as in the case of the
conventional hadrons, the semileptonic transitions form a very small part of
its full width.
|
[
{
"created": "Thu, 12 Apr 2018 14:11:42 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Jun 2018 04:58:35 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Jul 2018 06:52:20 GMT",
"version": "v3"
}
] |
2018-08-15
|
[
[
"Sundu",
"H.",
""
],
[
"Barsbay",
"B.",
""
],
[
"Agaev",
"S. S.",
""
],
[
"Azizi",
"K.",
""
]
] |
The semileptonic decays of the open charm-bottom axial-vector tetraquark $ Z_{s}=[cs][\overline{b}\overline{s}]$ to $X(4274)\overline{l} \nu_l$, $l=e, \mu, \tau $ are explored by means of the QCD three-point sum rule method. Both $Z_{s}$ and $X(4274)=[cs][\overline{c}\overline{s}]$ are treated as color sextet diquark-antidiquark states. The full width of the decays $Z_s \to X(4274)\overline{l} \nu_l$ is found. Obtained predictions for $ \Gamma(Z_s \to X(4274)\overline{l} \nu_l)$ demonstrate that, as in the case of the conventional hadrons, the semileptonic transitions form a very small part of its full width.
|
2003.08379
|
Emilio Royo
|
Rafel Escribano and Emilio Royo
|
$\pi^0$-$\eta$-$\eta^{\prime}$ mixing from $V\!\rightarrow\!P\gamma$ and
$P\!\rightarrow\!V\gamma$ decays
|
10 pages, 3 tables
| null |
10.1016/j.physletb.2020.135534
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An enhanced phenomenological model that includes isospin-symmetry breaking is
presented in this letter. The model is then used in a number of statistical
fits to the most recent experimental data for the radiative transitions
$V\!P\gamma$ ($V=\rho$, $K^*$, $\omega$, $\phi$ and $P=\pi$, $K$, $\eta$,
$\eta^{\prime}$) and estimations for the mixing angles amongst the three
pseudoscalar states with vanishing third-component of isospin are obtained. The
quality of the performed fits is good, e.g.
$\chi^2_{\textrm{min}}/\textrm{d.o.f} = 1.9$. The current experimental
uncertainties allow for isospin symmetry violations with a confidence level of
approximately $2.5\sigma$.
|
[
{
"created": "Wed, 18 Mar 2020 17:55:10 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Jun 2020 20:49:58 GMT",
"version": "v2"
}
] |
2020-06-16
|
[
[
"Escribano",
"Rafel",
""
],
[
"Royo",
"Emilio",
""
]
] |
An enhanced phenomenological model that includes isospin-symmetry breaking is presented in this letter. The model is then used in a number of statistical fits to the most recent experimental data for the radiative transitions $V\!P\gamma$ ($V=\rho$, $K^*$, $\omega$, $\phi$ and $P=\pi$, $K$, $\eta$, $\eta^{\prime}$) and estimations for the mixing angles amongst the three pseudoscalar states with vanishing third-component of isospin are obtained. The quality of the performed fits is good, e.g. $\chi^2_{\textrm{min}}/\textrm{d.o.f} = 1.9$. The current experimental uncertainties allow for isospin symmetry violations with a confidence level of approximately $2.5\sigma$.
|
2306.05460
|
Miguel Escudero
|
Mattia Cielo, Miguel Escudero, Gianpiero Mangano, Ofelia Pisanti
|
Neff in the Standard Model at NLO is 3.043
|
4 pages, 2 figures. v2: Added a paragraph discussing electroweak
corrections and other processes at O(alpha). v3: matches published version.
References added, typos fixed
| null | null |
CERN-TH-2023-103
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The effective number of relativistic neutrino species is a fundamental probe
of the early Universe and its measurement represents a key constraint on many
scenarios beyond the Standard Model of Particle Physics. In light of this, an
accurate prediction of $N_{\rm eff}$ in the Standard Model is of pivotal
importance. In this work, we consider the last ingredient needed to accurately
calculate $N_{\rm eff}^{\rm SM}$: standard zero and finite temperature QED
corrections to $e^+e^- \leftrightarrow \nu\bar{\nu}$ interaction rates during
neutrino decoupling at temperatures around $T\sim {\rm MeV}$. We find that this
effect leads to a reduction of $-0.0007$ in $N_{\rm eff}^{\rm SM}$. This NLO
QED correction to the interaction rates, together with finite temperature QED
corrections to the electromagnetic density of the plasma, and the effect of
neutrino oscillations, implies that $N_{\rm eff}^{\rm SM} = 3.043$ with a
theoretical uncertainty that is much smaller than any projected observational
sensitivity.
|
[
{
"created": "Thu, 8 Jun 2023 18:00:02 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Jun 2023 12:41:08 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Dec 2023 12:35:31 GMT",
"version": "v3"
}
] |
2023-12-21
|
[
[
"Cielo",
"Mattia",
""
],
[
"Escudero",
"Miguel",
""
],
[
"Mangano",
"Gianpiero",
""
],
[
"Pisanti",
"Ofelia",
""
]
] |
The effective number of relativistic neutrino species is a fundamental probe of the early Universe and its measurement represents a key constraint on many scenarios beyond the Standard Model of Particle Physics. In light of this, an accurate prediction of $N_{\rm eff}$ in the Standard Model is of pivotal importance. In this work, we consider the last ingredient needed to accurately calculate $N_{\rm eff}^{\rm SM}$: standard zero and finite temperature QED corrections to $e^+e^- \leftrightarrow \nu\bar{\nu}$ interaction rates during neutrino decoupling at temperatures around $T\sim {\rm MeV}$. We find that this effect leads to a reduction of $-0.0007$ in $N_{\rm eff}^{\rm SM}$. This NLO QED correction to the interaction rates, together with finite temperature QED corrections to the electromagnetic density of the plasma, and the effect of neutrino oscillations, implies that $N_{\rm eff}^{\rm SM} = 3.043$ with a theoretical uncertainty that is much smaller than any projected observational sensitivity.
|
1207.1313
|
Kazuhiro Tobe
|
Shunichi Kanemitsu and Kazuhiro Tobe
|
New physics for muon anomalous magnetic moment and its electroweak
precision analysis
|
31 pages, 20 figures
| null |
10.1103/PhysRevD.86.095025
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
About 3 sigma deviation from the standard model prediction of muon anomalous
magnetic moment (muon g-2) has been reported. We consider new physics beyond
the standard model which has new Yukawa interactions with muon. We compute new
contributions to muon g-2 and corrections to electroweak observables, and show
the consistent region of parameter space. We find that in a simple model where
the chirality flip of muon occurs only in the external muon line in one-loop
muon g-2 diagrams, it is necessary to introduce the relatively large new Yukawa
coupling and the electroweak scale new particles. On the other hand, in a model
where the chirality flip can occur in the internal fermion line of one loop
muon g-2 diagrams, we can obtain favorable g-2 contributions without large
Yukawa coupling, and they are consistent with the precision electroweak
observables. Finally, we discuss effects of new particles for muon g-2 on the
Higgs boson decay h to 2 photons and direct productions of these particles at
the LHC experiment.
|
[
{
"created": "Thu, 5 Jul 2012 18:04:42 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Sep 2012 00:38:35 GMT",
"version": "v2"
}
] |
2015-06-05
|
[
[
"Kanemitsu",
"Shunichi",
""
],
[
"Tobe",
"Kazuhiro",
""
]
] |
About 3 sigma deviation from the standard model prediction of muon anomalous magnetic moment (muon g-2) has been reported. We consider new physics beyond the standard model which has new Yukawa interactions with muon. We compute new contributions to muon g-2 and corrections to electroweak observables, and show the consistent region of parameter space. We find that in a simple model where the chirality flip of muon occurs only in the external muon line in one-loop muon g-2 diagrams, it is necessary to introduce the relatively large new Yukawa coupling and the electroweak scale new particles. On the other hand, in a model where the chirality flip can occur in the internal fermion line of one loop muon g-2 diagrams, we can obtain favorable g-2 contributions without large Yukawa coupling, and they are consistent with the precision electroweak observables. Finally, we discuss effects of new particles for muon g-2 on the Higgs boson decay h to 2 photons and direct productions of these particles at the LHC experiment.
|
hep-ph/0508287
|
Junfeng Sun
|
Dongsheng Du
|
QCD Factorization and Rare B Meson Decays
|
6 pages, 1 figure, 1 table; one footnote is added; Plenary talk given
at the International conference on QCD and hadronic physics, June, 16-20,
2005, Beijing, China
|
Int.J.Mod.Phys. A21 (2006) 658-663
|
10.1142/S0217751X06031855
| null |
hep-ph
| null |
Some recent progress in China in the study of charmless B decays with QCD
factorization is reviewed. Chirally enhanced power corrections and infrared
divergence problem are stressed.
|
[
{
"created": "Mon, 29 Aug 2005 01:38:57 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Aug 2005 03:44:51 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Du",
"Dongsheng",
""
]
] |
Some recent progress in China in the study of charmless B decays with QCD factorization is reviewed. Chirally enhanced power corrections and infrared divergence problem are stressed.
|
0804.3345
|
A. B. Balantekin
|
A.B. Balantekin and D. Yilmaz (Wisconsin U., Madison)
|
Contrasting solar and reactor neutrinos with a non-zero value of theta13
|
6 pages of LATEX, 5 figures
|
J.Phys.G35:075007,2008
|
10.1088/0954-3899/35/7/075007
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
When solar neutrino and KamLAND data are analyzed separately one finds that,
even though allowed regions of neutrino parameters overlap, the values of
$\delta m^2$ and the mixing angle $\theta_{12}$ at the $\chi^2$ minima are
different. We show that a non-zero, but small value of the angle $\theta_{13}$
can account for this behavior. From the joint analysis of solar neutrino and
KamLAND data we find the best fit value of $\sin^2 2 \theta_{13} = 0.01
^{-0.01}_{+0.09}$.
|
[
{
"created": "Mon, 21 Apr 2008 15:47:13 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jun 2008 19:16:57 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Balantekin",
"A. B.",
"",
"Wisconsin U., Madison"
],
[
"Yilmaz",
"D.",
"",
"Wisconsin U., Madison"
]
] |
When solar neutrino and KamLAND data are analyzed separately one finds that, even though allowed regions of neutrino parameters overlap, the values of $\delta m^2$ and the mixing angle $\theta_{12}$ at the $\chi^2$ minima are different. We show that a non-zero, but small value of the angle $\theta_{13}$ can account for this behavior. From the joint analysis of solar neutrino and KamLAND data we find the best fit value of $\sin^2 2 \theta_{13} = 0.01 ^{-0.01}_{+0.09}$.
|
hep-ph/9708214
|
Christoph Greub
|
C. Greub and T. Hurth
|
$B \to X_s gamma$ in the Standard Model
|
11 pages including 2 postscript figures
| null |
10.1142/9789814503952_0014
|
DESY 97-144, SLAC-PUB-7612,ITP-SB-97-46
|
hep-ph
| null |
We give a summary about the various contributions which have to be calculated
in order to obtain the next-to-leading logarithmic result for the branching
ratio $BR(B \to X_s \gamma)$. Combining all these ingredients, which were
obtained by different groups, a complete next-to-leading-logarithmic prediction
of the inclusive decay rate was recently presented in the literature. The
theoretical uncertainty in the partonic decay rate is now at the 10% level,
i.e., less than half of the error in the previous leading-logarithmic result.
We also mention the impact of non-perturbative corrections which scale like
$1/m_b^2$ and discuss in some more detail the recently discovered corrections
which scale like $1/m_c^2$. It turns out that the $1/m_b^2$- and the $1/m_c^2$
terms lead to corrections to the branching ratio $BR(B \to X_s \gamma)$ well
below the 10% level.
|
[
{
"created": "Fri, 1 Aug 1997 15:12:04 GMT",
"version": "v1"
}
] |
2016-11-03
|
[
[
"Greub",
"C.",
""
],
[
"Hurth",
"T.",
""
]
] |
We give a summary about the various contributions which have to be calculated in order to obtain the next-to-leading logarithmic result for the branching ratio $BR(B \to X_s \gamma)$. Combining all these ingredients, which were obtained by different groups, a complete next-to-leading-logarithmic prediction of the inclusive decay rate was recently presented in the literature. The theoretical uncertainty in the partonic decay rate is now at the 10% level, i.e., less than half of the error in the previous leading-logarithmic result. We also mention the impact of non-perturbative corrections which scale like $1/m_b^2$ and discuss in some more detail the recently discovered corrections which scale like $1/m_c^2$. It turns out that the $1/m_b^2$- and the $1/m_c^2$ terms lead to corrections to the branching ratio $BR(B \to X_s \gamma)$ well below the 10% level.
|
2209.03217
|
Alexander Nesterenko
|
A.V.Nesterenko
|
Addendum: Timelike and spacelike kernel functions for the hadronic
vacuum polarization contribution to the muon anomalous magnetic moment (2022
J. Phys. G: Nucl. Part. Phys. 49 055001)
|
6 pages, 3 figures; v2: minor amendments
|
J. Phys. G50, 029401 (2023)
|
10.1088/1361-6471/aca3c1
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This addendum provides results complementary to those obtained in [J. Phys.
G49, 055001 (2022)]. Specifically, an equivalent form of the relation, which
binds together the "spacelike" kernel functions for the hadronic vacuum
polarization contribution to the muon anomalous magnetic moment
$a^{\text{HVP}}_{\mu}$, is obtained. It is shown that the infrared limiting
value of the "spacelike" and "timelike" kernel functions, which enter the
representations for $a^{\text{HVP}}_{\mu}$ involving the Adler function and the
$R$-ratio, is identical to the corresponding QED contribution to the muon
anomalous magnetic moment of the preceding order in the electromagnetic
coupling. The next-to-leading order contributions $a^{\text{HVP}(3b)}_{\mu}$
(which includes the leptonic and hadronic insertions) and
$a^{\text{HVP}(3c)}_{\mu}$ (which includes the double hadronic insertion), are
studied. The three kernel functions appearing in the representations for
$a^{\text{HVP}(3b)}_{\mu}$, which involve the hadronic vacuum polarization
function, Adler function, and the $R$-ratio, are presented for the cases of the
electron and $\tau$-lepton loop insertions.
|
[
{
"created": "Wed, 7 Sep 2022 15:23:22 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Dec 2022 12:29:59 GMT",
"version": "v2"
}
] |
2022-12-22
|
[
[
"Nesterenko",
"A. V.",
""
]
] |
This addendum provides results complementary to those obtained in [J. Phys. G49, 055001 (2022)]. Specifically, an equivalent form of the relation, which binds together the "spacelike" kernel functions for the hadronic vacuum polarization contribution to the muon anomalous magnetic moment $a^{\text{HVP}}_{\mu}$, is obtained. It is shown that the infrared limiting value of the "spacelike" and "timelike" kernel functions, which enter the representations for $a^{\text{HVP}}_{\mu}$ involving the Adler function and the $R$-ratio, is identical to the corresponding QED contribution to the muon anomalous magnetic moment of the preceding order in the electromagnetic coupling. The next-to-leading order contributions $a^{\text{HVP}(3b)}_{\mu}$ (which includes the leptonic and hadronic insertions) and $a^{\text{HVP}(3c)}_{\mu}$ (which includes the double hadronic insertion), are studied. The three kernel functions appearing in the representations for $a^{\text{HVP}(3b)}_{\mu}$, which involve the hadronic vacuum polarization function, Adler function, and the $R$-ratio, are presented for the cases of the electron and $\tau$-lepton loop insertions.
|
hep-ph/9809321
|
Paolo Ciafaloni
|
P. Ciafaloni (INFN Lecce), D. Comelli (INFN Ferrara)
|
Sudakov Effects in Electroweak Corrections
|
Title changed and minor changes in the text. Final version to be
published on Physics Letters B. 8 pages, 3 figures
|
Phys.Lett.B446:278-284,1999
|
10.1016/S0370-2693(98)01541-X
|
INFNFE-0998
|
hep-ph
| null |
In perturbation theory the infrared structure of the electroweak interactions
produces large corrections proportional to double logarithms log^2 (s/m^2),
similar to Sudakov logarithms in QED, when the scale s is much larger than the
typical mass m of the particles running in the loops. These energy growing
corrections can be particularly relevant for the planned Next Linear Colliders.
We study these effects in the Standard Model for the process e+ e^->f fbar and
we compare them with similar corrections coming from SUSY loops.
|
[
{
"created": "Thu, 10 Sep 1998 10:05:27 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jan 1999 18:11:54 GMT",
"version": "v2"
}
] |
2009-07-09
|
[
[
"Ciafaloni",
"P.",
"",
"INFN Lecce"
],
[
"Comelli",
"D.",
"",
"INFN Ferrara"
]
] |
In perturbation theory the infrared structure of the electroweak interactions produces large corrections proportional to double logarithms log^2 (s/m^2), similar to Sudakov logarithms in QED, when the scale s is much larger than the typical mass m of the particles running in the loops. These energy growing corrections can be particularly relevant for the planned Next Linear Colliders. We study these effects in the Standard Model for the process e+ e^->f fbar and we compare them with similar corrections coming from SUSY loops.
|
1510.08072
|
Skokov Vladimir
|
Larry McLerran and Vladimir Skokov
|
Finite Numbers of Sources, Particle Correlations and the Color Glass
Condensate
|
19 pages, 3 figures; minor text corrections
|
Nuclear Physics, Section A (2016), pp. 142-154
|
10.1016/j.nuclphysa.2015.12.005
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that for a finite number of emitting sources, the Color Glass
Condensate produces substantial elliptic azimuthal anisotropy, characterized by
$v_2$, for two and four particle correlations for momentum greater than or of
the order the saturation momentum. The flow produced has the correct
semi-quantitative features to describe flow seen in LHC experiments with p-Pb
and pp collisions. This flow is induced by quantum mechanical interference
between the waves of produced particles, and the flow itself is coupled to
fluctuations in the positions of emitting sources. We shortly discuss
generalizing these results to odd $v_n$, to correlations involving larger
number of particles, and to transverse momentum scales $\Lambda_{\rm QCD} \ll
p_T \ll Q_{\rm sat}$.
|
[
{
"created": "Tue, 27 Oct 2015 20:09:34 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Oct 2015 13:34:21 GMT",
"version": "v2"
}
] |
2016-01-06
|
[
[
"McLerran",
"Larry",
""
],
[
"Skokov",
"Vladimir",
""
]
] |
We show that for a finite number of emitting sources, the Color Glass Condensate produces substantial elliptic azimuthal anisotropy, characterized by $v_2$, for two and four particle correlations for momentum greater than or of the order the saturation momentum. The flow produced has the correct semi-quantitative features to describe flow seen in LHC experiments with p-Pb and pp collisions. This flow is induced by quantum mechanical interference between the waves of produced particles, and the flow itself is coupled to fluctuations in the positions of emitting sources. We shortly discuss generalizing these results to odd $v_n$, to correlations involving larger number of particles, and to transverse momentum scales $\Lambda_{\rm QCD} \ll p_T \ll Q_{\rm sat}$.
|
1512.01857
|
Thomas A. Trainor
|
Thomas A. Trainor
|
$\bf p$-$\bf p$ minimum-bias dijets and nonjet quadrupole in relation to
conjectured collectivity (flows) in high-energy nuclear collisions
|
6 pages, 5 figures, prepared for XLV ISMD 2015
| null |
10.1051/epjconf/201612006006
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recent observations of ridge-like structure in $p$-$p$ and $p$-$A$ angular
correlations at the RHIC and LHC have been interpreted to imply collective
motion in smaller collision systems. It is argued that if correlation
structures accepted as manifestations of flow in $A$-$A$ collisions appear in
smaller systems collectivity (flow) must extend to the smaller systems. But the
argument could be reversed to conclude that such structures appearing in
$A$-$A$ collisions may not imply hydrodynamic flow. I present spectrum,
correlation and fluctuation data from RHIC $p$-$p$ and Au-Au collisions and
$p$-$p$, $p$-Pb and Pb-Pb results from the LHC described accurately by a
two-component (soft+dijet) model of hadron production. I also present evidence
for a significant $p$-$p$ nonjet (NJ) quadrupole ($v_2$) component with
$n_{ch}$ systematics directly related to $A$-$A$ NJ quadrupole systematics. The
combination suggests that soft, dijet and NJ quadrupole components are distinct
phenomena in all cases, inconsistent with hadron production from a common bulk
medium exhibiting collective motion (flow).
|
[
{
"created": "Sun, 6 Dec 2015 23:14:32 GMT",
"version": "v1"
}
] |
2016-07-20
|
[
[
"Trainor",
"Thomas A.",
""
]
] |
Recent observations of ridge-like structure in $p$-$p$ and $p$-$A$ angular correlations at the RHIC and LHC have been interpreted to imply collective motion in smaller collision systems. It is argued that if correlation structures accepted as manifestations of flow in $A$-$A$ collisions appear in smaller systems collectivity (flow) must extend to the smaller systems. But the argument could be reversed to conclude that such structures appearing in $A$-$A$ collisions may not imply hydrodynamic flow. I present spectrum, correlation and fluctuation data from RHIC $p$-$p$ and Au-Au collisions and $p$-$p$, $p$-Pb and Pb-Pb results from the LHC described accurately by a two-component (soft+dijet) model of hadron production. I also present evidence for a significant $p$-$p$ nonjet (NJ) quadrupole ($v_2$) component with $n_{ch}$ systematics directly related to $A$-$A$ NJ quadrupole systematics. The combination suggests that soft, dijet and NJ quadrupole components are distinct phenomena in all cases, inconsistent with hadron production from a common bulk medium exhibiting collective motion (flow).
|
hep-ph/0603262
|
Ashutosh Alok
|
Ashutosh Kumar Alok, S. Uma Sankar
|
New physics upper bound on the branching ratio of B_s --> l+ l- gamma
|
Additional constraints from current data on B-->K^* gamma are
considered. Present data on b-->s transitions allow a large boost in
B(B_s-->l+ l-) but not in B(B_s-->l+ l- gamma)
|
Mod.Phys.Lett.A22:1319-1328,2007
|
10.1142/S0217732307021901
| null |
hep-ph
| null |
We consider the effect of new physics on the branching ratio of B_s--> l+ l-
gamma where l=e,mu. If the new physics is of the form scalar/pseudoscalar, then
it makes no contribution to B_s--> l+ l- gamma, unlike in the case of B_s--> l+
l-, where it can potentially make a very large contribution. If the new physics
is in the form of vector/axial-vector operators, then present data on
B-->(K,K^*)l+ l-, does not allow a large enhancement for B_s--> l+ l- gamma. If
the new physics is in the form of tensor/pseudotensor operators, then the data
on B-->(K,K^*)l+ l- gives no useful constraint but the data on B-->K^* gamma
does. Here again, a large enhancement of B(B_s--> l+ l- gamma), much beyond the
Standard Model expectation, is not possible. Hence, we conclude that the
present data on b-->s transitions allow a large boost in B_s--> l+ l- but not
in B_s--> l+ l- gamma.
|
[
{
"created": "Fri, 31 Mar 2006 06:17:40 GMT",
"version": "v1"
},
{
"created": "Wed, 10 May 2006 13:33:03 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Alok",
"Ashutosh Kumar",
""
],
[
"Sankar",
"S. Uma",
""
]
] |
We consider the effect of new physics on the branching ratio of B_s--> l+ l- gamma where l=e,mu. If the new physics is of the form scalar/pseudoscalar, then it makes no contribution to B_s--> l+ l- gamma, unlike in the case of B_s--> l+ l-, where it can potentially make a very large contribution. If the new physics is in the form of vector/axial-vector operators, then present data on B-->(K,K^*)l+ l-, does not allow a large enhancement for B_s--> l+ l- gamma. If the new physics is in the form of tensor/pseudotensor operators, then the data on B-->(K,K^*)l+ l- gives no useful constraint but the data on B-->K^* gamma does. Here again, a large enhancement of B(B_s--> l+ l- gamma), much beyond the Standard Model expectation, is not possible. Hence, we conclude that the present data on b-->s transitions allow a large boost in B_s--> l+ l- but not in B_s--> l+ l- gamma.
|
1205.2844
|
Osamu Seto
|
Nobuchika Okada and Osamu Seto
|
Originally Asymmetric Dark Matter
|
24 pages. Final journal version
| null |
10.1103/PhysRevD.86.063525
|
HGU-CAP 16
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a scenario with a fermion dark matter, where the dark matter
particle used to be the Dirac fermion, but it takes the form of the Majorana
fermion at a late time. The relic number density of the dark matter is
determined by the dark matter asymmetry generated through the same mechanism as
leptogenesis when the dark matter was the Dirac fermion. After efficient dark
matter annihilation processes have frozen out, a phase transition of a scalar
field takes place and generates Majorana mass terms to turn the dark matter
particle into the Majorana fermion. In order to address this scenario in
detail, we propose two simple models. The first one is based on the Standard
Model (SM) gauge group and the dark matter originates the $SU(2)_L$ doublet
Dirac fermion, analogous to the Higgsino-like neutralino in supersymmetric
models. We estimate the spin-independent/dependent elastic scattering cross
sections of this late-time Majorana dark matter with a proton and find the
possibility to discover it by the direct and/or indirect dark matter search
experiments in the near future. The second model is based on the $B-L$ gauged
extension of the SM, where the dark matter is a SM singlet. Although this model
is similar to the so-called Higgs portal dark matter scenario, the
spin-independent elastic scattering cross section can be large enough to detect
this dark matter in future experiments.
|
[
{
"created": "Sun, 13 May 2012 09:27:43 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Jul 2012 11:59:10 GMT",
"version": "v2"
},
{
"created": "Fri, 28 Sep 2012 15:11:23 GMT",
"version": "v3"
}
] |
2015-06-05
|
[
[
"Okada",
"Nobuchika",
""
],
[
"Seto",
"Osamu",
""
]
] |
We propose a scenario with a fermion dark matter, where the dark matter particle used to be the Dirac fermion, but it takes the form of the Majorana fermion at a late time. The relic number density of the dark matter is determined by the dark matter asymmetry generated through the same mechanism as leptogenesis when the dark matter was the Dirac fermion. After efficient dark matter annihilation processes have frozen out, a phase transition of a scalar field takes place and generates Majorana mass terms to turn the dark matter particle into the Majorana fermion. In order to address this scenario in detail, we propose two simple models. The first one is based on the Standard Model (SM) gauge group and the dark matter originates the $SU(2)_L$ doublet Dirac fermion, analogous to the Higgsino-like neutralino in supersymmetric models. We estimate the spin-independent/dependent elastic scattering cross sections of this late-time Majorana dark matter with a proton and find the possibility to discover it by the direct and/or indirect dark matter search experiments in the near future. The second model is based on the $B-L$ gauged extension of the SM, where the dark matter is a SM singlet. Although this model is similar to the so-called Higgs portal dark matter scenario, the spin-independent elastic scattering cross section can be large enough to detect this dark matter in future experiments.
|
1101.1926
|
Agnes Mocsy
|
Agnes Mocsy (Pratt Institute), Paul Sorensen (BNL)
|
Analyzing the Power Spectrum of the Little Bangs
|
4 pages, talk given at Hard Probes 2010, Eilat, Israel
| null |
10.1016/j.nuclphysa.2011.02.049
| null |
hep-ph nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this talk we discuss the analogy between data from heavy-ion collisions
and the Cosmic Microwave Background. We identify p_T correlations data as the
heavy-ion analogy to the CMB and extract a power-spectrum from the heavy-ion
data. We define the ratio of the final state power-spectrum to the initial
coordinate-space eccentricity as the transfer-function. From the
transfer-function we find that higher $n$ terms are suppressed and we argue
that the suppression provides information on length scales like the
mean-free-path. We make a rough estimate of the mean-free-path and find that it
is larger than estimates based on the centrality dependence of v_2.
|
[
{
"created": "Mon, 10 Jan 2011 18:57:32 GMT",
"version": "v1"
}
] |
2015-05-27
|
[
[
"Mocsy",
"Agnes",
"",
"Pratt Institute"
],
[
"Sorensen",
"Paul",
"",
"BNL"
]
] |
In this talk we discuss the analogy between data from heavy-ion collisions and the Cosmic Microwave Background. We identify p_T correlations data as the heavy-ion analogy to the CMB and extract a power-spectrum from the heavy-ion data. We define the ratio of the final state power-spectrum to the initial coordinate-space eccentricity as the transfer-function. From the transfer-function we find that higher $n$ terms are suppressed and we argue that the suppression provides information on length scales like the mean-free-path. We make a rough estimate of the mean-free-path and find that it is larger than estimates based on the centrality dependence of v_2.
|
2206.10808
|
Yevgeny Stadnik
|
Yevgeny V. Stadnik
|
Searching for ultralight scalar dark matter with muonium and muonic
atoms
|
14 pages, 2 figures, version accepted for publication in PRL
|
Physical Review Letters 131, 011001 (2023)
|
10.1103/PhysRevLett.131.011001
| null |
hep-ph astro-ph.CO gr-qc physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Ultralight scalar dark matter may induce apparent oscillations of the muon
mass, which may be directly probed via temporal shifts in the spectra of
muonium and muonic atoms. Existing datasets and ongoing spectroscopy
measurements with muonium are capable of probing scalar-muon interactions that
are up to 12 orders of magnitude more stringent than astrophysical bounds.
Ongoing free-fall experiments with muonium can probe forces associated with the
exchange of virtual ultralight scalar bosons between muons and standard-model
particles, offering up to 5 orders of magnitude improvement in sensitivity over
complementary laboratory and astrophysical bounds.
|
[
{
"created": "Wed, 22 Jun 2022 02:16:03 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Oct 2022 05:34:39 GMT",
"version": "v2"
},
{
"created": "Mon, 29 May 2023 06:28:43 GMT",
"version": "v3"
}
] |
2023-07-10
|
[
[
"Stadnik",
"Yevgeny V.",
""
]
] |
Ultralight scalar dark matter may induce apparent oscillations of the muon mass, which may be directly probed via temporal shifts in the spectra of muonium and muonic atoms. Existing datasets and ongoing spectroscopy measurements with muonium are capable of probing scalar-muon interactions that are up to 12 orders of magnitude more stringent than astrophysical bounds. Ongoing free-fall experiments with muonium can probe forces associated with the exchange of virtual ultralight scalar bosons between muons and standard-model particles, offering up to 5 orders of magnitude improvement in sensitivity over complementary laboratory and astrophysical bounds.
|
1904.09680
|
Mohammad Moosavi Nejad
|
S. Mohammad Moosavi Nejad, S. Abbaspour, R. Farashahian
|
Interference effects for the top quark decays $t\to
b+W^+/H^+(\to\tau^+\nu_\tau)$
|
10 pages, 10 figures, 51 References. Accepted by Physical Review D.
arXiv admin note: text overlap with arXiv:1806.02546; text overlap with
arXiv:1411.4652, arXiv:0911.3027 by other authors
|
Phys. Rev. D 99, 095012 (2019)
|
10.1103/PhysRevD.99.095012
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Applying the narrow-width approximation (NWA), we first review the NLO QCD
predictions for the total decay rate of top quark considering two unstable
intermediate particles: the $W^+$-boson in the standard model (SM) of particle
physics and the charged Higgs boson $H^+$ in the generic type-I and II
two-Higgs-doublet models, i.e. $t\to b+W^+/H^+(\to \tau^+\nu_\tau)$. We then
estimate the errors arised from this approximation at leading-order
perturbation theory. Finally, we shall investigate the interference effects in
the factorization of production and decay parts of intermediate particles. We
will show that for nearly mass-degenerate states ($m_{H^+}\approx m_{W^+}$),
the correction due to the interference effect is considerable.
|
[
{
"created": "Sun, 21 Apr 2019 23:52:24 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Apr 2019 13:45:42 GMT",
"version": "v2"
},
{
"created": "Fri, 10 May 2019 07:50:16 GMT",
"version": "v3"
}
] |
2019-05-22
|
[
[
"Nejad",
"S. Mohammad Moosavi",
""
],
[
"Abbaspour",
"S.",
""
],
[
"Farashahian",
"R.",
""
]
] |
Applying the narrow-width approximation (NWA), we first review the NLO QCD predictions for the total decay rate of top quark considering two unstable intermediate particles: the $W^+$-boson in the standard model (SM) of particle physics and the charged Higgs boson $H^+$ in the generic type-I and II two-Higgs-doublet models, i.e. $t\to b+W^+/H^+(\to \tau^+\nu_\tau)$. We then estimate the errors arised from this approximation at leading-order perturbation theory. Finally, we shall investigate the interference effects in the factorization of production and decay parts of intermediate particles. We will show that for nearly mass-degenerate states ($m_{H^+}\approx m_{W^+}$), the correction due to the interference effect is considerable.
|
hep-ph/9309243
|
David London
|
G. Belanger, D. London and H. Nadeau
|
Single Leptoquark Production
|
5 pages, LaTeX, 3 figures (not included, but available upon request),
UdeM-LPN-TH-93-160, McGill-93/29
| null | null | null |
hep-ph
| null |
The single production of leptoquarks in $e^+e^-$, $e\gamma$ and $\gamma
\gamma$ linear colliders is discussed. We show that these new particles could
be seen in such machines even if their mass is close to the kinematic limit.
(Invited talk given by G.B. at the ``Workshop on Physics and Experiments at
Linear $e^+e^-$ Colliders'', Waikoloa, Hawaii, April 26-30, 1993.)
|
[
{
"created": "Wed, 8 Sep 1993 16:11:29 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Belanger",
"G.",
""
],
[
"London",
"D.",
""
],
[
"Nadeau",
"H.",
""
]
] |
The single production of leptoquarks in $e^+e^-$, $e\gamma$ and $\gamma \gamma$ linear colliders is discussed. We show that these new particles could be seen in such machines even if their mass is close to the kinematic limit. (Invited talk given by G.B. at the ``Workshop on Physics and Experiments at Linear $e^+e^-$ Colliders'', Waikoloa, Hawaii, April 26-30, 1993.)
|
1305.0251
|
Hong-Jian He
|
Zhong-Zhi Xianyu, Jing Ren, Hong-Jian He
|
Gravitational Interaction of Higgs Boson and Weak Boson Scattering
|
7pp, Phys.Rev.D Published Version. All results + conclusions
un-changed. Only minor rewording to clarify the Importance of this work
|
Phys. Rev. D 88 (2013) 096013
|
10.1103/PhysRevD.88.096013
| null |
hep-ph gr-qc hep-ex hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
With the LHC discovery of a 125 GeV Higgs-like boson, we study gravitational
interaction of the Higgs boson via the unique dimension-4 operator involving
Higgs doublet and scalar curvature, $\,\xi H^\dag H R\,$, with nonminimal
coupling $\,\xi\,$. This Higgs portal term can be transformed away in Einstein
frame and induces gauge-invariant effective interactions in the Higgs sector.
We study the weak boson scattering in Einstein frame, and explicitly
demonstrate the longitudinal-Goldstone boson equivalence theorem in the
presence of $\,\xi\,$ coupling. With these, we derive unitarity bound on the
Higgs gravitational coupling $\,\xi\,$ in Einstein frame, which is stronger
than that inferred from the current LHC Higgs measurements. We further study
$\xi$-dependent weak boson scattering cross sections at TeV scale, and propose
a new LHC probe of the Higgs-gravity coupling $\,\xi\,$ via weak boson
scattering experiments.
|
[
{
"created": "Wed, 1 May 2013 19:31:53 GMT",
"version": "v1"
},
{
"created": "Mon, 20 May 2013 18:05:09 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Nov 2013 17:05:08 GMT",
"version": "v3"
}
] |
2013-11-28
|
[
[
"Xianyu",
"Zhong-Zhi",
""
],
[
"Ren",
"Jing",
""
],
[
"He",
"Hong-Jian",
""
]
] |
With the LHC discovery of a 125 GeV Higgs-like boson, we study gravitational interaction of the Higgs boson via the unique dimension-4 operator involving Higgs doublet and scalar curvature, $\,\xi H^\dag H R\,$, with nonminimal coupling $\,\xi\,$. This Higgs portal term can be transformed away in Einstein frame and induces gauge-invariant effective interactions in the Higgs sector. We study the weak boson scattering in Einstein frame, and explicitly demonstrate the longitudinal-Goldstone boson equivalence theorem in the presence of $\,\xi\,$ coupling. With these, we derive unitarity bound on the Higgs gravitational coupling $\,\xi\,$ in Einstein frame, which is stronger than that inferred from the current LHC Higgs measurements. We further study $\xi$-dependent weak boson scattering cross sections at TeV scale, and propose a new LHC probe of the Higgs-gravity coupling $\,\xi\,$ via weak boson scattering experiments.
|
1205.1815
|
Andrey Grozin
|
Andrey Grozin
|
Quantum Chromodynamics
|
Lectures at Baikal summer school on astrophysics and physics of
elementary particles, July 2011
| null | null |
Baikal-2011
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The classical Lagrangian of chromodynamics, its quantization in the
perturbation theory framework, and renormalization form the subject of these
lectures. Symmetries of the theory are discussed. The dependence of the
coupling constant $\alpha_s$ on the renormalization scale $\mu$ is considered
in detail.
|
[
{
"created": "Tue, 8 May 2012 20:23:15 GMT",
"version": "v1"
}
] |
2012-05-10
|
[
[
"Grozin",
"Andrey",
""
]
] |
The classical Lagrangian of chromodynamics, its quantization in the perturbation theory framework, and renormalization form the subject of these lectures. Symmetries of the theory are discussed. The dependence of the coupling constant $\alpha_s$ on the renormalization scale $\mu$ is considered in detail.
|
hep-ph/9611277
| null |
Zurab Berezhiani and Zurab Tavartkiladze (INFN Ferrara)
|
Anomalous U(1) symmetry and missing doublet SU(5) model
|
16 pages, LATEX, no figures
|
Phys.Lett.B396:150-160,1997
|
10.1016/S0370-2693(97)00122-6
|
INFN-FE 13/96
|
hep-ph hep-th
| null |
We present the supersymmetric $SU(5)$ models which provide a simple ``all
order'' solution to the doublet-triplet splitting problem through the missing
doublet mechanism. The crucial role is played by the anomalous $U(1)_A$ gauge
symmetry and no additional discrete or global symmetries are needed.
Remarkably, such models can be realized even if the 75-plet Higgs is replaced
by the standard 24-plet. The same $U(1)_A$ symmetry can also guarantee an exact
or approximate conservation of R parity, by suppressing the B and L violating
operators to the needed level. The neutrino masses and the proton decay via
$d=5$ operators are also examined. We also extend the model by incorporating
$U(1)_A$ as a horizontal symmetry for explaining the fermion mass and mixing
hierarchy. Interestingly, in this scheme the necessary mild violation of the
troublesome $SU(5)$ degeneracy between the down quark and the charged lepton
masses can be induced by certain R-parity violating operators.
|
[
{
"created": "Mon, 11 Nov 1996 00:35:39 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Berezhiani",
"Zurab",
"",
"INFN Ferrara"
],
[
"Tavartkiladze",
"Zurab",
"",
"INFN Ferrara"
]
] |
We present the supersymmetric $SU(5)$ models which provide a simple ``all order'' solution to the doublet-triplet splitting problem through the missing doublet mechanism. The crucial role is played by the anomalous $U(1)_A$ gauge symmetry and no additional discrete or global symmetries are needed. Remarkably, such models can be realized even if the 75-plet Higgs is replaced by the standard 24-plet. The same $U(1)_A$ symmetry can also guarantee an exact or approximate conservation of R parity, by suppressing the B and L violating operators to the needed level. The neutrino masses and the proton decay via $d=5$ operators are also examined. We also extend the model by incorporating $U(1)_A$ as a horizontal symmetry for explaining the fermion mass and mixing hierarchy. Interestingly, in this scheme the necessary mild violation of the troublesome $SU(5)$ degeneracy between the down quark and the charged lepton masses can be induced by certain R-parity violating operators.
|
hep-ph/9309240
|
Ar
|
Andrija Ra\v{s}in and Jo\~ao P. Silva
|
Approximate Flavor Symmetries in the Lepton Sector
|
12 pages (no figures), LBL-34592
|
Phys.Rev.D49:20-23,1994
|
10.1103/PhysRevD.49.20
| null |
hep-ph
| null |
Approximate flavor symmetries in the quark sector have been used as a handle
on physics beyond the Standard Model. Due to the great interest in neutrino
masses and mixings and the wealth of existing and proposed neutrino experiments
it is important to extend this analysis to the leptonic sector. We show that in
the see-saw mechanism, the neutrino masses and mixing angles do not depend on
the details of the right-handed neutrino flavor symmetry breaking, and are
related by a simple formula. We propose several ans\"{a}tze which relate
different flavor symmetry breaking parameters and find that the MSW solution to
the solar neutrino problem is always easily fit. Further, the $\nu_\mu -
\nu_\tau$ oscillation is unlikely to solve the atmospheric neutrino problem
and, if we fix the neutrino mass scale by the MSW solution, the neutrino masses
are found to be too small to close the Universe.
|
[
{
"created": "Tue, 7 Sep 1993 23:54:06 GMT",
"version": "v1"
}
] |
2016-08-14
|
[
[
"Rašin",
"Andrija",
""
],
[
"Silva",
"João P.",
""
]
] |
Approximate flavor symmetries in the quark sector have been used as a handle on physics beyond the Standard Model. Due to the great interest in neutrino masses and mixings and the wealth of existing and proposed neutrino experiments it is important to extend this analysis to the leptonic sector. We show that in the see-saw mechanism, the neutrino masses and mixing angles do not depend on the details of the right-handed neutrino flavor symmetry breaking, and are related by a simple formula. We propose several ans\"{a}tze which relate different flavor symmetry breaking parameters and find that the MSW solution to the solar neutrino problem is always easily fit. Further, the $\nu_\mu - \nu_\tau$ oscillation is unlikely to solve the atmospheric neutrino problem and, if we fix the neutrino mass scale by the MSW solution, the neutrino masses are found to be too small to close the Universe.
|
1409.3203
|
Nan Su
|
Nan Su and Konrad Tywoniuk
|
Massless Mode and Positivity Violation in Hot QCD
|
5 pages, 2 figures; v3 - published version
|
Phys. Rev. Lett. 114, 161601 (2015)
|
10.1103/PhysRevLett.114.161601
|
BI-TP 2014/12, ICCUB-14-058
|
hep-ph hep-lat hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the quark self-energy at one-loop level at high temperature,
taking into account contributions from both the (chromo)electric scale $gT$ and
the (chromo)magnetic scale $g^2T$. While reproducing standard massive
excitations due to the electric scale, we uncover a novel massless excitation
ascribable to the magnetic scale. The residue of this massless excitation is
nonpositive at all temperatures, which consequently gives rise to positivity
violation in the quark spectral functions. This demonstrates the profound
impact of confinement effects on thermal quark collective excitations, which
manifest genuine long-range correlations in the system.
|
[
{
"created": "Wed, 10 Sep 2014 19:26:47 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Nov 2014 19:18:46 GMT",
"version": "v2"
},
{
"created": "Wed, 29 Apr 2015 19:55:47 GMT",
"version": "v3"
}
] |
2015-04-30
|
[
[
"Su",
"Nan",
""
],
[
"Tywoniuk",
"Konrad",
""
]
] |
We calculate the quark self-energy at one-loop level at high temperature, taking into account contributions from both the (chromo)electric scale $gT$ and the (chromo)magnetic scale $g^2T$. While reproducing standard massive excitations due to the electric scale, we uncover a novel massless excitation ascribable to the magnetic scale. The residue of this massless excitation is nonpositive at all temperatures, which consequently gives rise to positivity violation in the quark spectral functions. This demonstrates the profound impact of confinement effects on thermal quark collective excitations, which manifest genuine long-range correlations in the system.
|
1303.7244
|
Alessandro Strumia
|
Marco Farina, Duccio Pappadopulo and Alessandro Strumia
|
A modified naturalness principle and its experimental tests
|
17 pages, 3 figures. v3: final version uploaded, references added,
numerical error in the last column of table 1 fixed
| null |
10.1007/JHEP08(2013)022
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by LHC results, we modify the usual criterion for naturalness by
ignoring the uncomputable power divergences. The Standard Model satisfies the
modified criterion ('finite naturalness') for the measured values of its
parameters. Extensions of the SM motivated by observations (Dark Matter,
neutrino masses, the strong CP problem, vacuum instability, inflation) satisfy
finite naturalness in special ranges of their parameter spaces which often
imply new particles below a few TeV. Finite naturalness bounds are weaker than
usual naturalness bounds because any new particle with SM gauge interactions
gives a finite contribution to the Higgs mass at two loop order.
|
[
{
"created": "Thu, 28 Mar 2013 20:20:29 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Apr 2014 15:43:24 GMT",
"version": "v2"
},
{
"created": "Tue, 29 Apr 2014 06:18:59 GMT",
"version": "v3"
}
] |
2015-06-15
|
[
[
"Farina",
"Marco",
""
],
[
"Pappadopulo",
"Duccio",
""
],
[
"Strumia",
"Alessandro",
""
]
] |
Motivated by LHC results, we modify the usual criterion for naturalness by ignoring the uncomputable power divergences. The Standard Model satisfies the modified criterion ('finite naturalness') for the measured values of its parameters. Extensions of the SM motivated by observations (Dark Matter, neutrino masses, the strong CP problem, vacuum instability, inflation) satisfy finite naturalness in special ranges of their parameter spaces which often imply new particles below a few TeV. Finite naturalness bounds are weaker than usual naturalness bounds because any new particle with SM gauge interactions gives a finite contribution to the Higgs mass at two loop order.
|
1808.01502
|
Ferruccio Feruglio
|
Ferruccio Feruglio
|
B-anomalies related to leptons and lepton flavour violation: new
directions in model building
|
9 pages, 2 figures, proceedings of BEAUTY2018, 6-11 May, 2018, Elba
Island, Italy
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
B-decays mediated by both charged currents and neutral currents have provided
hints of violation of lepton flavour universality. By assuming an explanation
of these anomalies in terms of new physics at the TeV scale affecting the third
fermion generation, we review the relevant constraints. In particular we
illustrate the effects of electroweak radiative corrections and their impact on
a consistent interpretation of the data. The simplest scenario is ruled out and
we briefly discuss the modifications required to simultaneously describe the
whole set of anomalies.
|
[
{
"created": "Sat, 4 Aug 2018 16:10:25 GMT",
"version": "v1"
}
] |
2018-08-07
|
[
[
"Feruglio",
"Ferruccio",
""
]
] |
B-decays mediated by both charged currents and neutral currents have provided hints of violation of lepton flavour universality. By assuming an explanation of these anomalies in terms of new physics at the TeV scale affecting the third fermion generation, we review the relevant constraints. In particular we illustrate the effects of electroweak radiative corrections and their impact on a consistent interpretation of the data. The simplest scenario is ruled out and we briefly discuss the modifications required to simultaneously describe the whole set of anomalies.
|
hep-ph/0512019
|
David Morrissey
|
David E. Morrissey and James D. Wells
|
The tension between gauge coupling unification, the Higgs boson mass,
and a gauge-breaking origin of the supersymmetric mu-term
|
10 pages, no figures
|
Phys.Rev. D74 (2006) 015008
|
10.1103/PhysRevD.74.015008
|
MCTP-05-101
|
hep-ph
| null |
We investigate the possibility of generating the $\mu$-term in the MSSM by
the condensation of a field that is a singlet under the SM gauge group but
charged under an additional family-independent $U(1)_X$ gauge symmetry. We
attempt to do so while preserving the gauge coupling unification of the MSSM.
For this, we find that SM non-singlet exotics must be present in the spectrum.
We also prove that the pure $U(1)_X$ anomalies can always be solved with
rationally charged fields, but that a large number of SM singlets are often
required. For $U(1)_X$ charges that are consistent with an embedding of the
MSSM in SU(5) or SO(10), we show that the $U(1)_X$ charges of the MSSM states
can always be expressed as a linear combination of abelian subgroups of $E_6$.
However, the SM exotics do not appear to have a straightforward embedding into
GUT multiplets. We conclude from this study that if this approach to the
$\mu$-term is correct, as experiment can probe, it will necessarily complicate
the standard picture of supersymmetric grand unification.
|
[
{
"created": "Thu, 1 Dec 2005 20:04:58 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Morrissey",
"David E.",
""
],
[
"Wells",
"James D.",
""
]
] |
We investigate the possibility of generating the $\mu$-term in the MSSM by the condensation of a field that is a singlet under the SM gauge group but charged under an additional family-independent $U(1)_X$ gauge symmetry. We attempt to do so while preserving the gauge coupling unification of the MSSM. For this, we find that SM non-singlet exotics must be present in the spectrum. We also prove that the pure $U(1)_X$ anomalies can always be solved with rationally charged fields, but that a large number of SM singlets are often required. For $U(1)_X$ charges that are consistent with an embedding of the MSSM in SU(5) or SO(10), we show that the $U(1)_X$ charges of the MSSM states can always be expressed as a linear combination of abelian subgroups of $E_6$. However, the SM exotics do not appear to have a straightforward embedding into GUT multiplets. We conclude from this study that if this approach to the $\mu$-term is correct, as experiment can probe, it will necessarily complicate the standard picture of supersymmetric grand unification.
|
hep-ph/9808337
|
Yang Chun-Bin
|
C. B. Yang and X. Cai (Hua-Zhong Normal Univ., Wuhan, China)
|
Effect of spatial fluctuations on the scaled factorial moments in
second-order quark-hadron phase transition within Ginzburg-Landau description
|
Four pages in Revtex, and four figures in eps format
| null | null | null |
hep-ph
| null |
The scaled factorial moments in second-order quark-hadron phase transition
are reexamined within the Ginzburg-Landau description, with the spatial
fluctuations of phase angle of the complex field $\phi$ taken into account
rigorously. Scaling behaviors between $F_q$ and $F_2$ are shown, and the
exponent $\nu$ is found very close to the one without spatial fluctuations.
|
[
{
"created": "Mon, 17 Aug 1998 10:05:50 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Yang",
"C. B.",
"",
"Hua-Zhong Normal Univ., Wuhan, China"
],
[
"Cai",
"X.",
"",
"Hua-Zhong Normal Univ., Wuhan, China"
]
] |
The scaled factorial moments in second-order quark-hadron phase transition are reexamined within the Ginzburg-Landau description, with the spatial fluctuations of phase angle of the complex field $\phi$ taken into account rigorously. Scaling behaviors between $F_q$ and $F_2$ are shown, and the exponent $\nu$ is found very close to the one without spatial fluctuations.
|
2302.07379
|
Gerardo Hern\'andez-Tom\'e
|
J. C. Garnica, G. Hern\'andez-Tom\'e and E. Peinado
|
Charged lepton-flavor violating processes and suppression of nonunitary
mixing effects in low-scale seesaw models
|
18 pages, 3 figures and 3 tables; typos corrected, clarification and
discussion added, version accepted for publication in PRD
| null |
10.1103/PhysRevD.108.035033
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We examine the parameter space region of the inverse seesaw model that is
consistent with neutrino oscillation data. We focus on the correlation between
the current limits from the search of the $\mu\to e\gamma$ lepton flavor
violating decay and the non-standard effects associated with the presence of
new heavy neutrino states. Unlike what we would expect from an inverse seesaw
model, we present a structure for the neutrinos mass matrices in which the
rates of charged lepton flavor-violating processes are negligible.
Additionally, we provide a model based on symmetries for such a scenario.
|
[
{
"created": "Tue, 14 Feb 2023 22:38:44 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Aug 2023 18:09:06 GMT",
"version": "v2"
}
] |
2023-08-28
|
[
[
"Garnica",
"J. C.",
""
],
[
"Hernández-Tomé",
"G.",
""
],
[
"Peinado",
"E.",
""
]
] |
We examine the parameter space region of the inverse seesaw model that is consistent with neutrino oscillation data. We focus on the correlation between the current limits from the search of the $\mu\to e\gamma$ lepton flavor violating decay and the non-standard effects associated with the presence of new heavy neutrino states. Unlike what we would expect from an inverse seesaw model, we present a structure for the neutrinos mass matrices in which the rates of charged lepton flavor-violating processes are negligible. Additionally, we provide a model based on symmetries for such a scenario.
|
0908.1286
|
Andre Rubbia
|
A. Rubbia
|
Underground Neutrino Detectors for Particle and Astroparticle Science:
the Giant Liquid Argon Charge Imaging ExpeRiment (GLACIER)
|
31 pages, 14 figures
|
J.Phys.Conf.Ser.171:012020,2009
|
10.1088/1742-6596/171/1/012020
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The current focus of the CERN program is the Large Hadron Collider (LHC),
however, CERN is engaged in long baseline neutrino physics with the CNGS
project and supports T2K as recognized CERN RE13, and for good reasons: a
number of observed phenomena in high-energy physics and cosmology lack their
resolution within the Standard Model of particle physics; these puzzles include
the origin of neutrino masses, CP-violation in the leptonic sector, and baryon
asymmetry of the Universe. They will only partially be addressed at LHC. A
positive measurement of $\sin^22\theta_{13}>0.01$ would certainly give a
tremendous boost to neutrino physics by opening the possibility to study CP
violation in the lepton sector and the determination of the neutrino mass
hierarchy with upgraded conventional super-beams. These experiments (so called
``Phase II'') require, in addition to an upgraded beam power, next generation
very massive neutrino detectors with excellent energy resolution and high
detection efficiency in a wide neutrino energy range, to cover 1st and 2nd
oscillation maxima, and excellent particle identification and
$\pi^0$ background suppression. Two generations of large water Cherenkov
detectors at Kamioka (Kamiokande and Super-Kamiokande) have been extremely
successful. And there are good reasons to consider a third generation water
Cherenkov detector with an order of magnitude larger mass than Super-Kamiokande
for both non-accelerator (proton decay, supernovae, ...) and accelerator-based
physics. On the other hand, a very massive underground liquid Argon detector of
about 100 kton could represent a credible alternative for the precision
measurements of ``Phase II'' and aim at significantly new results in neutrino
astroparticle and non-accelerator-based particle physics (e.g. proton decay).
|
[
{
"created": "Mon, 10 Aug 2009 09:30:54 GMT",
"version": "v1"
}
] |
2009-10-29
|
[
[
"Rubbia",
"A.",
""
]
] |
The current focus of the CERN program is the Large Hadron Collider (LHC), however, CERN is engaged in long baseline neutrino physics with the CNGS project and supports T2K as recognized CERN RE13, and for good reasons: a number of observed phenomena in high-energy physics and cosmology lack their resolution within the Standard Model of particle physics; these puzzles include the origin of neutrino masses, CP-violation in the leptonic sector, and baryon asymmetry of the Universe. They will only partially be addressed at LHC. A positive measurement of $\sin^22\theta_{13}>0.01$ would certainly give a tremendous boost to neutrino physics by opening the possibility to study CP violation in the lepton sector and the determination of the neutrino mass hierarchy with upgraded conventional super-beams. These experiments (so called ``Phase II'') require, in addition to an upgraded beam power, next generation very massive neutrino detectors with excellent energy resolution and high detection efficiency in a wide neutrino energy range, to cover 1st and 2nd oscillation maxima, and excellent particle identification and $\pi^0$ background suppression. Two generations of large water Cherenkov detectors at Kamioka (Kamiokande and Super-Kamiokande) have been extremely successful. And there are good reasons to consider a third generation water Cherenkov detector with an order of magnitude larger mass than Super-Kamiokande for both non-accelerator (proton decay, supernovae, ...) and accelerator-based physics. On the other hand, a very massive underground liquid Argon detector of about 100 kton could represent a credible alternative for the precision measurements of ``Phase II'' and aim at significantly new results in neutrino astroparticle and non-accelerator-based particle physics (e.g. proton decay).
|
hep-ph/0404163
|
Xing Gang Wu
|
T. Huang, X.G. Wu and X.H. Wu
|
Pion Form Factor in the $k_T$ Factorization Formalism
|
21 pages, 4 figures
|
Phys.Rev.D70:053007,2004
|
10.1103/PhysRevD.70.053007
| null |
hep-ph
| null |
Based on the light-cone (LC) framework and the $k_T$ factorization formalism,
the transverse momentum effects and the different helicity components'
contributions to the pion form factor $F_{\pi}(Q^2)$ are recalculated. In
particular, the contribution to the pion form factor from the higher helicity
components ($\lambda_1+\lambda_2=\pm 1$), which come from the spin-space Wigner
rotation, are analyzed in the soft and hard energy regions respectively. Our
results show that the right power behavior of the hard contribution from the
higher helicity components can only be obtained by fully keeping the $k_T$
dependence in the hard amplitude, and that the $k_T$ dependence in LC wave
function affects the hard and soft contributions substantially. As an example,
we employ a model LC wave function to calculate the pion form factor and then
compare the numerical predictions with the experimental data. It is shown that
the soft contribution is less important at the intermediate energy region.
|
[
{
"created": "Tue, 20 Apr 2004 13:29:07 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Apr 2004 08:40:30 GMT",
"version": "v2"
},
{
"created": "Sat, 12 Jun 2004 03:13:21 GMT",
"version": "v3"
}
] |
2009-08-25
|
[
[
"Huang",
"T.",
""
],
[
"Wu",
"X. G.",
""
],
[
"Wu",
"X. H.",
""
]
] |
Based on the light-cone (LC) framework and the $k_T$ factorization formalism, the transverse momentum effects and the different helicity components' contributions to the pion form factor $F_{\pi}(Q^2)$ are recalculated. In particular, the contribution to the pion form factor from the higher helicity components ($\lambda_1+\lambda_2=\pm 1$), which come from the spin-space Wigner rotation, are analyzed in the soft and hard energy regions respectively. Our results show that the right power behavior of the hard contribution from the higher helicity components can only be obtained by fully keeping the $k_T$ dependence in the hard amplitude, and that the $k_T$ dependence in LC wave function affects the hard and soft contributions substantially. As an example, we employ a model LC wave function to calculate the pion form factor and then compare the numerical predictions with the experimental data. It is shown that the soft contribution is less important at the intermediate energy region.
|
hep-ph/0106195
|
John F. Dawson
|
Krastan Blagoev, Fred Cooper, John Dawson, Bogdan Mihaila
|
Schwinger-Dyson approach to non-equilibrium classical field theory
|
36 pages, 5 figures
|
Phys.Rev. D64 (2001) 125003
|
10.1103/PhysRevD.64.125003
|
LAUR 01-3574
|
hep-ph
| null |
In this paper we discuss a Schwinger-Dyson [SD] approach for determining the
time evolution of the unequal time correlation functions of a non-equilibrium
classical field theory, where the classical system is described by an initial
density matrix at time $t=0$. We focus on $\lambda \phi^4$ field theory in 1+1
space time dimensions where we can perform exact numerical simulations by
sampling an ensemble of initial conditions specified by the initial density
matrix. We discuss two approaches. The first, the bare vertex approximation
[BVA], is based on ignoring vertex corrections to the SD equations in the
auxiliary field formalism relevant for 1/N expansions. The second approximation
is a related approximation made to the SD equations of the original formulation
in terms of $\phi$ alone. We compare these SD approximations as well as a
Hartree approximation with exact numerical simulations. We find that both
approximations based on the SD equations yield good agreement with exact
numerical simulations and cure the late time oscillation problem of the Hartree
approximation. We also discuss the relationship between the quantum and
classical SD equations.
|
[
{
"created": "Mon, 18 Jun 2001 15:09:30 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jun 2001 14:32:07 GMT",
"version": "v2"
},
{
"created": "Mon, 9 Jul 2001 20:23:38 GMT",
"version": "v3"
},
{
"created": "Tue, 28 Aug 2001 21:36:35 GMT",
"version": "v4"
}
] |
2009-11-07
|
[
[
"Blagoev",
"Krastan",
""
],
[
"Cooper",
"Fred",
""
],
[
"Dawson",
"John",
""
],
[
"Mihaila",
"Bogdan",
""
]
] |
In this paper we discuss a Schwinger-Dyson [SD] approach for determining the time evolution of the unequal time correlation functions of a non-equilibrium classical field theory, where the classical system is described by an initial density matrix at time $t=0$. We focus on $\lambda \phi^4$ field theory in 1+1 space time dimensions where we can perform exact numerical simulations by sampling an ensemble of initial conditions specified by the initial density matrix. We discuss two approaches. The first, the bare vertex approximation [BVA], is based on ignoring vertex corrections to the SD equations in the auxiliary field formalism relevant for 1/N expansions. The second approximation is a related approximation made to the SD equations of the original formulation in terms of $\phi$ alone. We compare these SD approximations as well as a Hartree approximation with exact numerical simulations. We find that both approximations based on the SD equations yield good agreement with exact numerical simulations and cure the late time oscillation problem of the Hartree approximation. We also discuss the relationship between the quantum and classical SD equations.
|
hep-ph/0212370
|
Alekhin
|
S.Alekhin (IHEP, Protvino)
|
High twists and the NNLO QCD corrections in DIS
|
7 pages, LATEX, 5 figures (EPS). Talk presented at the 12th
International Seminar on High-Energy Physics (QUARKS 2002), Novgorod, Russia,
1-7 Jun 2002
| null | null | null |
hep-ph
| null |
We discuss interplay between the high-twist (HT) terms in the
operator-product expansion and the next-to-next-to-leading-order (NNLO) QCD
corrections to the deep-inelastic-scattering structure functions in analysis of
the high-precision data for charged leptons. Under account of the NNLO
corrections the observed HT terms change within their experimental errors only
and do not vanish in the NNLO.
|
[
{
"created": "Thu, 26 Dec 2002 11:29:15 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Alekhin",
"S.",
"",
"IHEP, Protvino"
]
] |
We discuss interplay between the high-twist (HT) terms in the operator-product expansion and the next-to-next-to-leading-order (NNLO) QCD corrections to the deep-inelastic-scattering structure functions in analysis of the high-precision data for charged leptons. Under account of the NNLO corrections the observed HT terms change within their experimental errors only and do not vanish in the NNLO.
|
2101.02503
|
Chih-Ting Lu
|
Dong Woo Kang, P. Ko, Chih-Ting Lu
|
Exploring properties of long-lived particles in inelastic dark matter
models at Belle II
|
42 pages, 13 figures, and 5 tables, version published in JHEP
| null |
10.1007/JHEP04(2021)269
|
KIAS-P21001
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
The inelastic dark matter model is one kind of popular models for the light
dark matter (DM) below $O(1)$ GeV. If the mass splitting between DM excited and
ground states is small enough, the co-annihilation becomes the dominant channel
for thermal relic density and the DM excited state can be long-lived at the
collider scale. We study scalar and fermion inelastic dark matter models for $
{\cal O}(1) $ GeV DM at Belle II with $ U(1)_D $ dark gauge symmetry broken
into its $Z_2$ subgroup. We focus on dilepton displaced vertex signatures from
decays of the DM excited state. With the help of precise displaced vertex
detection ability at Belle II, we can explore the DM spin, mass and mass
splitting between DM excited and ground states. Especially, we show scalar and
fermion DM candidates can be discriminated and the mass and mass splitting of
DM sector can be determined within the percentage of deviation for some
benchmark points. Furthermore, the allowed parameter space to explain the
excess of muon $(g-2)_\mu$ is also studied and it can be covered in our
displaced vertex analysis during the early stage of Belle II experiment.
|
[
{
"created": "Thu, 7 Jan 2021 11:48:41 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Apr 2021 02:10:37 GMT",
"version": "v2"
}
] |
2021-05-19
|
[
[
"Kang",
"Dong Woo",
""
],
[
"Ko",
"P.",
""
],
[
"Lu",
"Chih-Ting",
""
]
] |
The inelastic dark matter model is one kind of popular models for the light dark matter (DM) below $O(1)$ GeV. If the mass splitting between DM excited and ground states is small enough, the co-annihilation becomes the dominant channel for thermal relic density and the DM excited state can be long-lived at the collider scale. We study scalar and fermion inelastic dark matter models for $ {\cal O}(1) $ GeV DM at Belle II with $ U(1)_D $ dark gauge symmetry broken into its $Z_2$ subgroup. We focus on dilepton displaced vertex signatures from decays of the DM excited state. With the help of precise displaced vertex detection ability at Belle II, we can explore the DM spin, mass and mass splitting between DM excited and ground states. Especially, we show scalar and fermion DM candidates can be discriminated and the mass and mass splitting of DM sector can be determined within the percentage of deviation for some benchmark points. Furthermore, the allowed parameter space to explain the excess of muon $(g-2)_\mu$ is also studied and it can be covered in our displaced vertex analysis during the early stage of Belle II experiment.
|
hep-ph/0605288
|
Jae Sik Lee
|
John Ellis, Jae Sik Lee, and Apostolos Pilaftsis
|
Higgs Phenomenology with CPsuperH
|
20 pages, LaTeX, 7 figures, invited article by Modern Physics Letters
A (review section)
|
Mod.Phys.Lett.A21:1405-1422,2006
|
10.1142/S0217732306020895
|
CERN-PH-TH/2006-102, MAN/HEP/2006/18
|
hep-ph
| null |
The MSSM contains CP-violating phases that may have important observable
effects in Higgs physics. We review recent highlights in Higgs phenomenology
obtained with the code CPsuperH, a useful tool for studies of the production,
mixing and decay of a coupled system of the neutral Higgs bosons at future high
energy colliders such as the LHC, ILC ($\gamma$LC), and a muon collider (MC).
CPsuperH implements the constraints from upper limits on electric dipole
moments, and may be extended to include other related low-energy observables,
such as b -> s \gamma and B -> K l l, and to compute the relic abundance of the
lightest neutralino.
|
[
{
"created": "Fri, 26 May 2006 16:20:22 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Jun 2006 06:12:00 GMT",
"version": "v2"
}
] |
2009-09-11
|
[
[
"Ellis",
"John",
""
],
[
"Lee",
"Jae Sik",
""
],
[
"Pilaftsis",
"Apostolos",
""
]
] |
The MSSM contains CP-violating phases that may have important observable effects in Higgs physics. We review recent highlights in Higgs phenomenology obtained with the code CPsuperH, a useful tool for studies of the production, mixing and decay of a coupled system of the neutral Higgs bosons at future high energy colliders such as the LHC, ILC ($\gamma$LC), and a muon collider (MC). CPsuperH implements the constraints from upper limits on electric dipole moments, and may be extended to include other related low-energy observables, such as b -> s \gamma and B -> K l l, and to compute the relic abundance of the lightest neutralino.
|
hep-ph/0403066
|
Carl Shakin
|
Xiangdong Li, Hu Li, C. M. Shakin, Qing Sun
|
Quark Propagation in the Quark-Gluon Plasma
|
17 pages, 4 figures, revtex4
|
Phys.Rev. C69 (2004) 065201
|
10.1103/PhysRevC.69.065201
|
BCCNT: 04/03/322
|
hep-ph
| null |
It has recently been suggested that the quark-gluon plasma formed in
heavy-ion collisions behaves as a nearly ideal fluid. That behavior may be
understood if the quark and antiquark mean-free- paths are very small in the
system, leading to a "sticky molasses" description of the plasma, as advocated
by the Stony Brook group. This behavior may be traced to the fact that there
are relatively low-energy $q\bar{q}$ resonance states in the plasma leading to
very large scattering lengths for the quarks. These resonances have been found
in lattice simulation of QCD using the maximum entropy method (MEM). We have
used a chiral quark model, which provides a simple representation of effects
due to instanton dynamics, to study the resonances obtained using the MEM
scheme. In the present work we use our model to study the optical potential of
a quark in the quark-gluon plasma and calculate the quark mean-free-path. Our
results represent a specific example of the dynamics of the plasma as described
by the Stony Brook group.
|
[
{
"created": "Fri, 5 Mar 2004 14:52:02 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Li",
"Xiangdong",
""
],
[
"Li",
"Hu",
""
],
[
"Shakin",
"C. M.",
""
],
[
"Sun",
"Qing",
""
]
] |
It has recently been suggested that the quark-gluon plasma formed in heavy-ion collisions behaves as a nearly ideal fluid. That behavior may be understood if the quark and antiquark mean-free- paths are very small in the system, leading to a "sticky molasses" description of the plasma, as advocated by the Stony Brook group. This behavior may be traced to the fact that there are relatively low-energy $q\bar{q}$ resonance states in the plasma leading to very large scattering lengths for the quarks. These resonances have been found in lattice simulation of QCD using the maximum entropy method (MEM). We have used a chiral quark model, which provides a simple representation of effects due to instanton dynamics, to study the resonances obtained using the MEM scheme. In the present work we use our model to study the optical potential of a quark in the quark-gluon plasma and calculate the quark mean-free-path. Our results represent a specific example of the dynamics of the plasma as described by the Stony Brook group.
|
hep-ph/9908243
|
Boris Kopeliovich
|
Y.B. He, J. Huefner and B.Z. Kopeliovich
|
J/Psi and Psi' total cross sections and formation times from data for
charmonium suppression in $pA$ collisions
|
13 pages of Latex including 2 figures; typos in the abstract are
corrected
|
Phys.Lett. B477 (2000) 93-98
|
10.1016/S0370-2693(00)00198-2
| null |
hep-ph nucl-th
| null |
The recent data for E866 experiment on the x_F dependence for charmonium
suppression in pA collisions at 800 GeV are analyzed using a time- and
energy-dependent preformed charmonium absorption cross section
\sigma_{abs}^\psi(\tau,\sqrt{s}). For \sqrt{s}=10 GeV the initially (\tau=0)
produced premeson has an absorption cross section of \sigma_{pr}~3mb. At the
same energy but for \tau -> \infty one deduces for the total cross sections
\sigma_{tot}^{J/Psi N}=(2.8\pm 0.3)mb, \sigma_{tot}^{J/Psi N}= (10.5\pm 3.6)mb.
The date are compatible with a formation time \tau_{1/2}=0.6 fm/c.
|
[
{
"created": "Wed, 4 Aug 1999 10:23:26 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Aug 1999 21:22:47 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"He",
"Y. B.",
""
],
[
"Huefner",
"J.",
""
],
[
"Kopeliovich",
"B. Z.",
""
]
] |
The recent data for E866 experiment on the x_F dependence for charmonium suppression in pA collisions at 800 GeV are analyzed using a time- and energy-dependent preformed charmonium absorption cross section \sigma_{abs}^\psi(\tau,\sqrt{s}). For \sqrt{s}=10 GeV the initially (\tau=0) produced premeson has an absorption cross section of \sigma_{pr}~3mb. At the same energy but for \tau -> \infty one deduces for the total cross sections \sigma_{tot}^{J/Psi N}=(2.8\pm 0.3)mb, \sigma_{tot}^{J/Psi N}= (10.5\pm 3.6)mb. The date are compatible with a formation time \tau_{1/2}=0.6 fm/c.
|
1207.1324
|
Diptimoy Ghosh
|
Amol Dighe, Diptimoy Ghosh
|
How large can the branching ratio of $B_s \to \tau^+ \tau^-$ be ?
|
Typos corrected, some discussions added, accepted for publication in
Phys.Rev.D
| null |
10.1103/PhysRevD.86.054023
|
TIFR/TH/12-28
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by the large like-sign dimuon charge asymmetry observed recently,
whose explanation would require an enhanced decay rate of $B_s \to \tau^+
\tau^-$, we explore how large a branching ratio of this decay mode is allowed
by the present constraints. We use bounds from the lifetimes of $B_d$ and
$B_s$, constraints from the branching ratios of related $b \to s \tau^+ \tau^-$
modes, as well as measurements of the mass difference, width difference and
CP-violating phase in the $B_s$-$\bar{B}_s$ system. Using an effective field
theory approach, we show that a branching ratio as high as 15% may be allowed
while being consistent with the above constraints. The model with a scalar
leptoquark cannot increase the branching ratio to a per cent level. However, an
enhancement up to 5% is possible in the model with an extremely light $Z'$ with
flavor-dependent interactions, even after all the couplings are taken to be
perturbative. This however cannot account for the dimuon anomaly completely by
itself.
|
[
{
"created": "Thu, 5 Jul 2012 18:50:39 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Sep 2012 03:31:16 GMT",
"version": "v2"
}
] |
2015-06-05
|
[
[
"Dighe",
"Amol",
""
],
[
"Ghosh",
"Diptimoy",
""
]
] |
Motivated by the large like-sign dimuon charge asymmetry observed recently, whose explanation would require an enhanced decay rate of $B_s \to \tau^+ \tau^-$, we explore how large a branching ratio of this decay mode is allowed by the present constraints. We use bounds from the lifetimes of $B_d$ and $B_s$, constraints from the branching ratios of related $b \to s \tau^+ \tau^-$ modes, as well as measurements of the mass difference, width difference and CP-violating phase in the $B_s$-$\bar{B}_s$ system. Using an effective field theory approach, we show that a branching ratio as high as 15% may be allowed while being consistent with the above constraints. The model with a scalar leptoquark cannot increase the branching ratio to a per cent level. However, an enhancement up to 5% is possible in the model with an extremely light $Z'$ with flavor-dependent interactions, even after all the couplings are taken to be perturbative. This however cannot account for the dimuon anomaly completely by itself.
|
1104.5405
|
Hiroshi Ohki
|
Naoyuki Haba, Hiroshi Ohki
|
Spontaneous Parity Violation in SUSY Strong Gauge Theory
|
14 pages
|
JHEP 1108:021,2011
|
10.1007/JHEP08(2011)021
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We suggest simple models of spontaneous parity violation in supersymmetric
strong gauge theory. We focus on left-right symmetric model and investigate
vacuum with spontaneous parity violation. Non-perturbative effects are
calculable in supersymmetric gauge theory, and we suggest two new models. The
first model shows confinement, and the second model has a dual description of
the theory. The left-right symmetry breaking and electroweak symmetry breaking
are simultaneously occurred with the suitable energy scale hierarchy. The
second model also induces spontaneous supersymmetry breaking.
|
[
{
"created": "Thu, 28 Apr 2011 14:28:18 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Jul 2011 00:53:45 GMT",
"version": "v2"
}
] |
2011-08-09
|
[
[
"Haba",
"Naoyuki",
""
],
[
"Ohki",
"Hiroshi",
""
]
] |
We suggest simple models of spontaneous parity violation in supersymmetric strong gauge theory. We focus on left-right symmetric model and investigate vacuum with spontaneous parity violation. Non-perturbative effects are calculable in supersymmetric gauge theory, and we suggest two new models. The first model shows confinement, and the second model has a dual description of the theory. The left-right symmetry breaking and electroweak symmetry breaking are simultaneously occurred with the suitable energy scale hierarchy. The second model also induces spontaneous supersymmetry breaking.
|
2101.10653
|
Hyun-Chul Kim
|
June-Young Kim, Hyun-Chul Kim, Ghil-Seok Yang, Makoto Oka
|
Electromagnetic transitions of the singly charmed baryons with spin 3/2
|
22 pages. 9 figures
|
Phys. Rev. D 103, 074025 (2021)
|
10.1103/PhysRevD.103.074025
|
INHA-NTG-01/2021
|
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the electromagnetic transitions of the singly charmed baryons
with spin 3/2, based on a pion mean-field approach, also known as the chiral
quark-soliton model, taking into account the rotational $1/N_c$ corrections and
the effects of flavor SU(3) symmetry breaking. We examine the valence- and
sea-quark contributions to the electromagnetic transition form factors and find
that the quadrupole form factors of the sea-quark contributions dominate over
those of the valence-quark ones in the smaller $Q^2$ region, whereas the sea
quarks only provide marginal contributions to the magnetic dipole transition
form factors of the baryon sextet with spin 3/2. The effects of the flavor
SU(3) symmetry breaking are in general very small except for the forbidden
transition $\Xi_c^0\gamma\to \Xi_c^{*0}$ by $U$-spin symmetry. We also discuss
the widths of the radiative decays for the baryon sextet with spin 3/2,
comparing the present results with those from other works.
|
[
{
"created": "Tue, 26 Jan 2021 09:27:48 GMT",
"version": "v1"
}
] |
2021-05-05
|
[
[
"Kim",
"June-Young",
""
],
[
"Kim",
"Hyun-Chul",
""
],
[
"Yang",
"Ghil-Seok",
""
],
[
"Oka",
"Makoto",
""
]
] |
We investigate the electromagnetic transitions of the singly charmed baryons with spin 3/2, based on a pion mean-field approach, also known as the chiral quark-soliton model, taking into account the rotational $1/N_c$ corrections and the effects of flavor SU(3) symmetry breaking. We examine the valence- and sea-quark contributions to the electromagnetic transition form factors and find that the quadrupole form factors of the sea-quark contributions dominate over those of the valence-quark ones in the smaller $Q^2$ region, whereas the sea quarks only provide marginal contributions to the magnetic dipole transition form factors of the baryon sextet with spin 3/2. The effects of the flavor SU(3) symmetry breaking are in general very small except for the forbidden transition $\Xi_c^0\gamma\to \Xi_c^{*0}$ by $U$-spin symmetry. We also discuss the widths of the radiative decays for the baryon sextet with spin 3/2, comparing the present results with those from other works.
|
1208.1159
|
C. A. Dominguez
|
J. Bordes, C. A. Dominguez, P. Moodley, J. Pe\~narrocha, K. Schilcher
|
Corrections to the ${\bf SU(3)\times SU(3)}$ Gell-Mann-Oakes-Renner
relation and chiral couplings $L^r_8$ and $H^r_2$
|
Revised version with minor corrections
| null |
10.1007/JHEP10(2012)102
|
UCT-TP-290/2012; MZ-TH/12-32
|
hep-ph hep-lat hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Next to leading order corrections to the $SU(3) \times SU(3)$
Gell-Mann-Oakes-Renner relation (GMOR) are obtained using weighted QCD Finite
Energy Sum Rules (FESR) involving the pseudoscalar current correlator. Two
types of integration kernels in the FESR are used to suppress the contribution
of the kaon radial excitations to the hadronic spectral function, one with
local and the other with global constraints. The result for the pseudoscalar
current correlator at zero momentum is $\psi_5(0) = (2.8 \pm 0.3) \times
10^{-3} GeV^{4}$, leading to the chiral corrections to GMOR: $\delta_K = (55
\pm 5)%$. The resulting uncertainties are mostly due to variations in the upper
limit of integration in the FESR, within the stability regions, and to a much
lesser extent due to the uncertainties in the strong coupling and the strange
quark mass. Higher order quark mass corrections, vacuum condensates, and the
hadronic resonance sector play a negligible role in this determination. These
results confirm an independent determination from chiral perturbation theory
giving also very large corrections, i.e. roughly an order of magnitude larger
than the corresponding corrections in chiral $SU(2) \times SU(2)$. Combining
these results with our previous determination of the corrections to GMOR in
chiral $SU(2) \times SU(2)$, $\delta_\pi$, we are able to determine two low
energy constants of chiral perturbation theory, i.e. $L^r_8 = (1.0 \pm 0.3)
\times 10^{-3}$, and $H^r_2 = - (4.7 \pm 0.6) \times 10^{-3}$, both at the
scale of the $\rho$-meson mass.
|
[
{
"created": "Mon, 6 Aug 2012 13:28:48 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Sep 2012 16:20:25 GMT",
"version": "v2"
},
{
"created": "Fri, 21 Sep 2012 12:44:56 GMT",
"version": "v3"
}
] |
2015-06-11
|
[
[
"Bordes",
"J.",
""
],
[
"Dominguez",
"C. A.",
""
],
[
"Moodley",
"P.",
""
],
[
"Peñarrocha",
"J.",
""
],
[
"Schilcher",
"K.",
""
]
] |
Next to leading order corrections to the $SU(3) \times SU(3)$ Gell-Mann-Oakes-Renner relation (GMOR) are obtained using weighted QCD Finite Energy Sum Rules (FESR) involving the pseudoscalar current correlator. Two types of integration kernels in the FESR are used to suppress the contribution of the kaon radial excitations to the hadronic spectral function, one with local and the other with global constraints. The result for the pseudoscalar current correlator at zero momentum is $\psi_5(0) = (2.8 \pm 0.3) \times 10^{-3} GeV^{4}$, leading to the chiral corrections to GMOR: $\delta_K = (55 \pm 5)%$. The resulting uncertainties are mostly due to variations in the upper limit of integration in the FESR, within the stability regions, and to a much lesser extent due to the uncertainties in the strong coupling and the strange quark mass. Higher order quark mass corrections, vacuum condensates, and the hadronic resonance sector play a negligible role in this determination. These results confirm an independent determination from chiral perturbation theory giving also very large corrections, i.e. roughly an order of magnitude larger than the corresponding corrections in chiral $SU(2) \times SU(2)$. Combining these results with our previous determination of the corrections to GMOR in chiral $SU(2) \times SU(2)$, $\delta_\pi$, we are able to determine two low energy constants of chiral perturbation theory, i.e. $L^r_8 = (1.0 \pm 0.3) \times 10^{-3}$, and $H^r_2 = - (4.7 \pm 0.6) \times 10^{-3}$, both at the scale of the $\rho$-meson mass.
|
2310.12392
|
Zeren Simon Wang
|
Julian Y. G\"unther, Jordy de Vries, Herbi K. Dreiner, Zeren Simon
Wang, Guanghui Zhou
|
Long-lived neutral fermions at the DUNE near detector
|
v1, 44 pages plus references, 9 figures, 21 tables; v2, minor
changes, accepted for publication in JHEP
| null |
10.1007/JHEP01(2024)108
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
At the Deep Underground Neutrino Experiment (DUNE), a proton beam hits a
fixed target leading to large production rates of mesons. These mesons can
decay and potentially provide a source of long-lived neutral fermions. Examples
of such long-lived fermions are heavy neutral leptons which can mix with the
standard-model active neutrinos, and the bino-like lightest neutralino in
R-parity-violating supersymmetry. We show that the Standard Model Effective
Field Theory extended with right-handed singlet neutrinos can simultaneously
describe heavy neutral leptons and bino-like neutralinos in a unified manner.
We use the effective-field-theory framework to determine the sensitivity reach
of the DUNE near detector in probing various scenarios of long-lived neutral
fermions.
|
[
{
"created": "Thu, 19 Oct 2023 00:18:51 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Dec 2023 07:24:36 GMT",
"version": "v2"
}
] |
2024-05-15
|
[
[
"Günther",
"Julian Y.",
""
],
[
"de Vries",
"Jordy",
""
],
[
"Dreiner",
"Herbi K.",
""
],
[
"Wang",
"Zeren Simon",
""
],
[
"Zhou",
"Guanghui",
""
]
] |
At the Deep Underground Neutrino Experiment (DUNE), a proton beam hits a fixed target leading to large production rates of mesons. These mesons can decay and potentially provide a source of long-lived neutral fermions. Examples of such long-lived fermions are heavy neutral leptons which can mix with the standard-model active neutrinos, and the bino-like lightest neutralino in R-parity-violating supersymmetry. We show that the Standard Model Effective Field Theory extended with right-handed singlet neutrinos can simultaneously describe heavy neutral leptons and bino-like neutralinos in a unified manner. We use the effective-field-theory framework to determine the sensitivity reach of the DUNE near detector in probing various scenarios of long-lived neutral fermions.
|
2204.06135
|
Xinjian Wen
|
Yuan Wang, Xin-Jian Wen
|
Thermodynamics of PNJL at zero temperature in a strong magnetic field
|
11 pages, 7 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, the deconfinement and chiral restoration transitions in strong
magnetic field is realized at zero temperature in the Polyakov
Nambu$-$Jona-Lasinio model. We provide the thermodynamic treatment to mimic the
deconfinement phase transition at zero temperature together with the entangled
scalar and vector interactions coupled with the Polyakov loop. The magnetic
catalysis is found by a rising behavior of the critical chemical potential for
the first-order deconfinement phase transition. While the magnetic catalysis on
the chiral restoration could convert to inverse magnetic catalysis under the
running coupling interaction ansatz. Furthermore, the stronger magnetic field
makes the possible quarkyonic phase window to be enlarged under the running
coupling interaction.
|
[
{
"created": "Wed, 13 Apr 2022 01:52:58 GMT",
"version": "v1"
}
] |
2022-04-14
|
[
[
"Wang",
"Yuan",
""
],
[
"Wen",
"Xin-Jian",
""
]
] |
In this paper, the deconfinement and chiral restoration transitions in strong magnetic field is realized at zero temperature in the Polyakov Nambu$-$Jona-Lasinio model. We provide the thermodynamic treatment to mimic the deconfinement phase transition at zero temperature together with the entangled scalar and vector interactions coupled with the Polyakov loop. The magnetic catalysis is found by a rising behavior of the critical chemical potential for the first-order deconfinement phase transition. While the magnetic catalysis on the chiral restoration could convert to inverse magnetic catalysis under the running coupling interaction ansatz. Furthermore, the stronger magnetic field makes the possible quarkyonic phase window to be enlarged under the running coupling interaction.
|
1204.1046
|
Yonit Hochberg
|
Gudrun Hiller, Yonit Hochberg and Yosef Nir
|
Supersymmetric \Delta A_{CP}
|
6 pages. v2: References added
| null |
10.1103/PhysRevD.85.116008
|
DO-TH 12/09
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
There is experimental evidence for a direct CP asymmetry in singly Cabibbo
suppressed D decays, \Delta A_{CP} \sim 0.006. Naive expectations are that the
Standard Model contribution to \Delta A_{CP} is an order of magnitude smaller.
We explore the possibility that a major part of the symmetry comes from
supersymmetric contributions. The leading candidates are models where the
flavor structure of the trilinear scalar couplings is related to the structure
of the Yukawa couplings via approximate flavor symmetries, particularly U(1),
[U(1)]^2 and U(2). The recent hints for a lightest neutral Higgs boson with
mass around 125 GeV support the requisite order one trilinear terms. The
typical value of the supersymmetric contribution to the asymmetry is \Delta
A_{CP}^{SUSY}\sim 0.001, but it could be accidentally enhanced by order one
coefficients.
|
[
{
"created": "Wed, 4 Apr 2012 19:46:48 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Jun 2012 15:45:19 GMT",
"version": "v2"
}
] |
2013-05-30
|
[
[
"Hiller",
"Gudrun",
""
],
[
"Hochberg",
"Yonit",
""
],
[
"Nir",
"Yosef",
""
]
] |
There is experimental evidence for a direct CP asymmetry in singly Cabibbo suppressed D decays, \Delta A_{CP} \sim 0.006. Naive expectations are that the Standard Model contribution to \Delta A_{CP} is an order of magnitude smaller. We explore the possibility that a major part of the symmetry comes from supersymmetric contributions. The leading candidates are models where the flavor structure of the trilinear scalar couplings is related to the structure of the Yukawa couplings via approximate flavor symmetries, particularly U(1), [U(1)]^2 and U(2). The recent hints for a lightest neutral Higgs boson with mass around 125 GeV support the requisite order one trilinear terms. The typical value of the supersymmetric contribution to the asymmetry is \Delta A_{CP}^{SUSY}\sim 0.001, but it could be accidentally enhanced by order one coefficients.
|
0909.1235
|
Wei-Ning Zhang
|
Wei-Ning Zhang, Zhi-Tao Yang, Yan-Yu Ren
|
Characteristic quantities of pion-emitting sources extracted by
model-independent analysis in relativistic heavy ion collisions
|
10 pages, 9 figures
|
Phys.Rev.C80:044908,2009
|
10.1103/PhysRevC.80.044908
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We examine the characteristic quantities of pion-emitting sources extracted
by model-independent imaging analysis in relativistic heavy ion collisions. The
moments of the spatial separation of pion pair emission can provide the
characteristic information about the source geometry and coherence. They are
better for describing the non-Gaussian sources with granular and core-halo
structures. An improved granular source model of quark-gluon plasma droplets
can reproduce the main characteristics of the two-pion correlation functions
and source functions in the experiment of $\sqrt{s_{\rm NN}}=200$ GeV Au+Au
collisions. The transverse-momentum dependence of the normalized first-order
moments of the separation for the granular source is consistent with that of
the usual interferometry results of source radii, after taking into account the
Lorentz contraction in the direction of transverse momentum of pion pair.
|
[
{
"created": "Mon, 7 Sep 2009 12:29:09 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Sep 2009 01:07:03 GMT",
"version": "v2"
}
] |
2009-11-05
|
[
[
"Zhang",
"Wei-Ning",
""
],
[
"Yang",
"Zhi-Tao",
""
],
[
"Ren",
"Yan-Yu",
""
]
] |
We examine the characteristic quantities of pion-emitting sources extracted by model-independent imaging analysis in relativistic heavy ion collisions. The moments of the spatial separation of pion pair emission can provide the characteristic information about the source geometry and coherence. They are better for describing the non-Gaussian sources with granular and core-halo structures. An improved granular source model of quark-gluon plasma droplets can reproduce the main characteristics of the two-pion correlation functions and source functions in the experiment of $\sqrt{s_{\rm NN}}=200$ GeV Au+Au collisions. The transverse-momentum dependence of the normalized first-order moments of the separation for the granular source is consistent with that of the usual interferometry results of source radii, after taking into account the Lorentz contraction in the direction of transverse momentum of pion pair.
|
hep-ph/0004033
|
German Rodrigo
|
Marcello Ciafaloni (Florence U. & INFN, Florence) and German Rodrigo
(Karlsruhe U.)
|
Heavy Quark Impact Factor at Next-to-leading Level
|
LaTeX2e, 17pp, 2 figures, uses JHEP.cls. The complete paper,
including figures, is also available via anonymous ftp at
ftp://ttpux2.physik.uni-karlsruhe.de/ttp00/ttp00-06, or via www at
http://www-ttp.physik.uni-karlsruhe.de/Preprints/
|
JHEP 0005 (2000) 042
|
10.1088/1126-6708/2000/05/042
|
DFF/350/03/00, TTP00-06
|
hep-ph
| null |
We further analyze the definition and the calculation of the heavy quark
impact factor at next-to-leading (NL) log(s) level, and we provide its
analytical expression in a previously proposed k-factorization scheme. Our
results indicate that k-factorization holds at NL level with a properly chosen
energy scale, and with the same gluonic Green's function previously found in
the massless probe case.
|
[
{
"created": "Tue, 4 Apr 2000 20:34:10 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Ciafaloni",
"Marcello",
"",
"Florence U. & INFN, Florence"
],
[
"Rodrigo",
"German",
"",
"Karlsruhe U."
]
] |
We further analyze the definition and the calculation of the heavy quark impact factor at next-to-leading (NL) log(s) level, and we provide its analytical expression in a previously proposed k-factorization scheme. Our results indicate that k-factorization holds at NL level with a properly chosen energy scale, and with the same gluonic Green's function previously found in the massless probe case.
|
1905.05354
|
Cai-Dian Lu
|
Faisal Munir Bhutta and Cai Dian Lu
|
Search for New Physics Signals via Doubly Weak B Decays
|
4 pages; to appear in the Proceedings of the 54th Rencontres de
Moriond QCD session, La Thuile, March 23-30, 2019
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The doubly weak $b\to dd{\bar s}$ and $b\to ss{\bar d}$ processes are highly
suppressed in the standard model that offer the unique opportunity to explore
new physics signals. The wrong sign decay $\smash{\overline B}^0\to K^+\pi^-$
mediated by the $b\to dd{\bar s}$ transition can be distinguished from the
penguin decay $\smash{B}^0\to K^+\pi^-$, through time dependent measurement in
experiments. We consider a model independent analysis of $\smash{\overline
B}^0\to K^+\pi^-$ decay, within the perturbative QCD approach and explore
various effective dimension-6 operators, in which large effects are possible.
We also study the doubly weak exclusive process in two example models namely
Randall-Sundrum model with custodial protection and the bulk-Higgs
Randall-Sundrum model. A large and significant enhancement of the branching
ratio, in comparison to the standard model, is observed after satisfying all
the relevant constraints on the parameter spaces of these models, which
requires to be searched in future experiments.
|
[
{
"created": "Tue, 14 May 2019 02:25:16 GMT",
"version": "v1"
}
] |
2019-05-15
|
[
[
"Bhutta",
"Faisal Munir",
""
],
[
"Lu",
"Cai Dian",
""
]
] |
The doubly weak $b\to dd{\bar s}$ and $b\to ss{\bar d}$ processes are highly suppressed in the standard model that offer the unique opportunity to explore new physics signals. The wrong sign decay $\smash{\overline B}^0\to K^+\pi^-$ mediated by the $b\to dd{\bar s}$ transition can be distinguished from the penguin decay $\smash{B}^0\to K^+\pi^-$, through time dependent measurement in experiments. We consider a model independent analysis of $\smash{\overline B}^0\to K^+\pi^-$ decay, within the perturbative QCD approach and explore various effective dimension-6 operators, in which large effects are possible. We also study the doubly weak exclusive process in two example models namely Randall-Sundrum model with custodial protection and the bulk-Higgs Randall-Sundrum model. A large and significant enhancement of the branching ratio, in comparison to the standard model, is observed after satisfying all the relevant constraints on the parameter spaces of these models, which requires to be searched in future experiments.
|
hep-ph/9510428
|
Zhang Wei-Min
|
Wei-Min Zhang
|
Quark Confinement in Light-Front QCD and A Weak-Coupling Treatment to
Heavy hadrons
|
71 pages Revtex with 4 Tables and 3 Figures. Some small changes and
typos corrections; a sign in eq.(5.1) is corrected
| null | null |
IP-ASTP-19-95
|
hep-ph hep-th
| null |
In this paper, we develop a weak-coupling treatment of nonperturbative QCD to
heavy hadrons on the light-front. First, we present a derivation of quark
confining interaction in light-front QCD for heavy quark systems, based on the
recently developed light-front similarity renormalization group approach and
the light-front heavy quark effective theory. The resulting effective
light-front QCD Hamiltonian $H_\lambda$ at a low-energy cutoff $\lambda$
manifests the coexistence of a confining potential and a Coulomb potential. A
clear light-front picture of quark confinement emerges. Using this low energy
QCD Hamiltonian $H_\lambda$, we study heavy hadron bound state equations in the
framework of a recently proposed possible weak-coupling treatment of
non-perturbative QCD. Light-front heavy hadron bound states with definite spin
and parity are constructed and the general structure of the corresponding
wavefunctions is explored. A Gaussian-type wavefunction ansatz is used to solve
the light-front quarkonium bound state equation. We find that the effective
coupling constant determined from the quarkonium bound state equation can be
arbitrarily small so that the weak-coupling treatment to heavy hadron bound
states in light-front QCD is explicitly achieved. Finally, the scale dependence
of the effective coupling constant is analytically calculated and the
similarity renormalization group $\beta$ function is determined, from which the
running coupling constant in small momentum transfer is given qualitatively by
$\overline{\alpha}(Q^2) \sim {\Lambda_{QCD}^2 \over Q^2}$. Such a running
coupling constant is the basic assumption in the successful Richardson
$Q\overline{Q}$ potential that ensures the existence of a linear confining
potential at large distance, but now can be obtained from light-front QCD.
|
[
{
"created": "Fri, 27 Oct 1995 08:36:35 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Nov 1995 09:42:24 GMT",
"version": "v2"
}
] |
2008-02-03
|
[
[
"Zhang",
"Wei-Min",
""
]
] |
In this paper, we develop a weak-coupling treatment of nonperturbative QCD to heavy hadrons on the light-front. First, we present a derivation of quark confining interaction in light-front QCD for heavy quark systems, based on the recently developed light-front similarity renormalization group approach and the light-front heavy quark effective theory. The resulting effective light-front QCD Hamiltonian $H_\lambda$ at a low-energy cutoff $\lambda$ manifests the coexistence of a confining potential and a Coulomb potential. A clear light-front picture of quark confinement emerges. Using this low energy QCD Hamiltonian $H_\lambda$, we study heavy hadron bound state equations in the framework of a recently proposed possible weak-coupling treatment of non-perturbative QCD. Light-front heavy hadron bound states with definite spin and parity are constructed and the general structure of the corresponding wavefunctions is explored. A Gaussian-type wavefunction ansatz is used to solve the light-front quarkonium bound state equation. We find that the effective coupling constant determined from the quarkonium bound state equation can be arbitrarily small so that the weak-coupling treatment to heavy hadron bound states in light-front QCD is explicitly achieved. Finally, the scale dependence of the effective coupling constant is analytically calculated and the similarity renormalization group $\beta$ function is determined, from which the running coupling constant in small momentum transfer is given qualitatively by $\overline{\alpha}(Q^2) \sim {\Lambda_{QCD}^2 \over Q^2}$. Such a running coupling constant is the basic assumption in the successful Richardson $Q\overline{Q}$ potential that ensures the existence of a linear confining potential at large distance, but now can be obtained from light-front QCD.
|
hep-ph/0105164
|
Zack E. Sullivan
|
Z. Sullivan
|
A supersymmetric solution to the bottom-quark cross section anomaly
|
Proceedings of XXXVI Rencontres de Moriond: QCD, March 17-24, 2001; 4
pgs., 3 ps figures
| null | null | null |
hep-ph hep-ex
| null |
In this talk, I describe a supersymmetric solution to the long-standing
discrepancy between the bottom-quark production cross section and predictions
of perturbative quantum chromodynamics. Pair production of light gluinos, of
mass 12-16 GeV, with two-body decays into bottom quarks and bottom squarks, of
mass 2-5.5 GeV, yields the correct normalizations and shapes of the measured
bottom-quark distributions. One prediction of this scenario is that like-sign B
mesons, B+B+ and B-B-, should be produced with a measurable rate at the next
run of the Fermilab Tevatron Collider.
|
[
{
"created": "Wed, 16 May 2001 19:48:15 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Sullivan",
"Z.",
""
]
] |
In this talk, I describe a supersymmetric solution to the long-standing discrepancy between the bottom-quark production cross section and predictions of perturbative quantum chromodynamics. Pair production of light gluinos, of mass 12-16 GeV, with two-body decays into bottom quarks and bottom squarks, of mass 2-5.5 GeV, yields the correct normalizations and shapes of the measured bottom-quark distributions. One prediction of this scenario is that like-sign B mesons, B+B+ and B-B-, should be produced with a measurable rate at the next run of the Fermilab Tevatron Collider.
|
hep-ph/0402060
|
Vadim Guzey
|
V. Guzey
|
Production of Theta+ in gamma + D -> Lambda + Theta+ and gamma + D ->
Sigma + Theta+ reactions
|
22 pages, 9 figures. Final published version
|
Phys.Rev. C69 (2004) 065203
|
10.1103/PhysRevC.69.065203
|
RUB-TP2-15/03
|
hep-ph
| null |
The gamma + D -> Lambda + Theta+ and gamma + D -> Sigma + Theta+ reactions
can be used to determine the width of Theta+ almost model-independently. We
calculate the differential cross sections of the gamma +D -> Lambda + Theta+,
gamma + D -> Sigma + Theta+ and relevant background reactions in the photon
energy range 1.2 < E_{\gamma} < 2.6 GeV. We determine the most favorable
kinematic conditions and observables for the experimental studies of Theta+ in
the considered processes. We argue that a comparison of the gamma + D -> Lambda
+ Theta+ and gamma + D -> Sigma + Theta+ cross sections should unambiguously
determine isospin of Theta+.
|
[
{
"created": "Thu, 5 Feb 2004 21:36:27 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Jun 2004 12:33:25 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Guzey",
"V.",
""
]
] |
The gamma + D -> Lambda + Theta+ and gamma + D -> Sigma + Theta+ reactions can be used to determine the width of Theta+ almost model-independently. We calculate the differential cross sections of the gamma +D -> Lambda + Theta+, gamma + D -> Sigma + Theta+ and relevant background reactions in the photon energy range 1.2 < E_{\gamma} < 2.6 GeV. We determine the most favorable kinematic conditions and observables for the experimental studies of Theta+ in the considered processes. We argue that a comparison of the gamma + D -> Lambda + Theta+ and gamma + D -> Sigma + Theta+ cross sections should unambiguously determine isospin of Theta+.
|
hep-ph/9510201
|
Antti Niemi
|
Antti J. Niemi
|
Gauge Vector Masses from Flat Connections?
|
13 pages Latex. Some minor typos have been fixed
|
Phys.Lett. B374 (1996) 119-126
|
10.1016/0370-2693(96)00099-8
| null |
hep-ph hep-th
| null |
We suggest that four dimensional massive gauge vectors could be described by
coupling ordinary Yang-Mills theory to a topological gauge theory. For this the
coupling should excite a nontrivial degree of freedom from the topological
theory, corresponding to the longitudinal polarization of a massive gauge
vector. If the coupling can be selected so that further degrees of freedom are
not excited, one may entirely avoid particles such as the Higgs. Here we
discuss a simple example of this idea, obtained by coupling standard Yang-Mills
theory to the topological gauge theory of flat connections. We propose that our
example might describe a renormalizable theory of massive gauge vectors with no
additional physical degrees of freedom.
|
[
{
"created": "Mon, 2 Oct 1995 19:02:32 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Oct 1995 22:50:30 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Niemi",
"Antti J.",
""
]
] |
We suggest that four dimensional massive gauge vectors could be described by coupling ordinary Yang-Mills theory to a topological gauge theory. For this the coupling should excite a nontrivial degree of freedom from the topological theory, corresponding to the longitudinal polarization of a massive gauge vector. If the coupling can be selected so that further degrees of freedom are not excited, one may entirely avoid particles such as the Higgs. Here we discuss a simple example of this idea, obtained by coupling standard Yang-Mills theory to the topological gauge theory of flat connections. We propose that our example might describe a renormalizable theory of massive gauge vectors with no additional physical degrees of freedom.
|
2203.08823
|
Yuber F. Perez-Gonzalez
|
Nicol\'as Bernal, Chee Sheng Fong, Yuber F. Perez-Gonzalez and Jessica
Turner
|
Rescuing High-Scale Leptogenesis using Primordial Black Holes
|
19 pages, 4 figures; Added clarifying comments and references.
Matches version accepted for publication in PRD
| null |
10.1103/PhysRevD.106.035019
|
PI/UAN-2022-711FT, IPPP/22/12
|
hep-ph astro-ph.CO
|
http://creativecommons.org/licenses/by/4.0/
|
We explore the interplay between light primordial black holes (PBH) and
high-scale baryogenesis, with a particular emphasis on leptogenesis. We first
review a generic baryogenesis scenario where a heavy particle, $X$, with mass,
$M_X$, produced solely from PBH evaporation decays to generate a baryon
asymmetry. We show that the viable parameter space is bounded from above by
$M_X \lesssim 10^{17}$ GeV and increases with decreasing $M_X$. We demonstrate
that regions of the leptogenesis parameter space where the lightest
right-handed neutrino (RHN) mass $M_{N_{1}}\gtrsim 10^{15}\,{\rm GeV}$ and
neutrino mass scale $m_\nu\gtrsim 0.1$ eV, excluded in standard cosmology due
to $\Delta L=2$ washout processes, becomes viable with the assistance of light
PBHs. This scenario of PBH-assisted leptogenesis occurs because the PBHs
radiate RHNs via Hawking evaporation late in the Universe's evolution when the
temperature of the thermal plasma is low relative to the RHN mass.
Subsequently, these RHNs can decay and produce a lepton asymmetry while the
washout processes are suppressed.
|
[
{
"created": "Wed, 16 Mar 2022 18:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Aug 2022 12:51:36 GMT",
"version": "v2"
}
] |
2022-08-31
|
[
[
"Bernal",
"Nicolás",
""
],
[
"Fong",
"Chee Sheng",
""
],
[
"Perez-Gonzalez",
"Yuber F.",
""
],
[
"Turner",
"Jessica",
""
]
] |
We explore the interplay between light primordial black holes (PBH) and high-scale baryogenesis, with a particular emphasis on leptogenesis. We first review a generic baryogenesis scenario where a heavy particle, $X$, with mass, $M_X$, produced solely from PBH evaporation decays to generate a baryon asymmetry. We show that the viable parameter space is bounded from above by $M_X \lesssim 10^{17}$ GeV and increases with decreasing $M_X$. We demonstrate that regions of the leptogenesis parameter space where the lightest right-handed neutrino (RHN) mass $M_{N_{1}}\gtrsim 10^{15}\,{\rm GeV}$ and neutrino mass scale $m_\nu\gtrsim 0.1$ eV, excluded in standard cosmology due to $\Delta L=2$ washout processes, becomes viable with the assistance of light PBHs. This scenario of PBH-assisted leptogenesis occurs because the PBHs radiate RHNs via Hawking evaporation late in the Universe's evolution when the temperature of the thermal plasma is low relative to the RHN mass. Subsequently, these RHNs can decay and produce a lepton asymmetry while the washout processes are suppressed.
|
1907.11193
|
Carlos Arg\"uelles Delgado
|
Carlos A. Arg\"uelles and Hrvoje Dujmovic (for the IceCube
Collaboration)
|
Searches for Connections Between Dark Matter and Neutrinos with the
IceCube High-Energy Starting Event Sample
|
Presented at the 36th International Cosmic Ray Conference (ICRC
2019). See arXiv:1907.11699 for all IceCube contributions, 6 pages, 2 figures
| null | null |
PoS-ICRC2019-839
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The nature of dark matter remains one of the most important open questions in
physics. Although dark matter effects have only been observed gravitationally,
the order-one ratio between conventional matter and dark matter hints to a
non-gravitational link between them. In this contribution, we search for such a
link using the IceCube high-energy starting event (HESE) sample, which contains
some of the highest energy neutrinos ever observed. These are dominated by a
yet unidentified high-energy diffuse astrophysical component. Using these
events we look for evidence of an excess due to dark matter decay or
annihilation, and also for a novel signature due to high-energy neutrinos
scattering with dark matter. Finally, in this contribution, we will summarize
and highlight the complementarity between the obtained limits for these two
scenarios.
|
[
{
"created": "Thu, 25 Jul 2019 16:53:43 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Aug 2019 22:07:54 GMT",
"version": "v2"
}
] |
2019-08-23
|
[
[
"Argüelles",
"Carlos A.",
"",
"for the IceCube\n Collaboration"
],
[
"Dujmovic",
"Hrvoje",
"",
"for the IceCube\n Collaboration"
]
] |
The nature of dark matter remains one of the most important open questions in physics. Although dark matter effects have only been observed gravitationally, the order-one ratio between conventional matter and dark matter hints to a non-gravitational link between them. In this contribution, we search for such a link using the IceCube high-energy starting event (HESE) sample, which contains some of the highest energy neutrinos ever observed. These are dominated by a yet unidentified high-energy diffuse astrophysical component. Using these events we look for evidence of an excess due to dark matter decay or annihilation, and also for a novel signature due to high-energy neutrinos scattering with dark matter. Finally, in this contribution, we will summarize and highlight the complementarity between the obtained limits for these two scenarios.
|
1206.5785
|
Yu Jia
|
Yu Jia, Wen-Long Sang, Jia Xu
|
Inclusive $h_c$ production at $B$ factories
|
v2, 23 pages, 1 table, 6 figures. Minor corrections, and a note
added, accepted for publication in PRD
| null |
10.1103/PhysRevD.86.074023
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Within the nonrelativistic QCD (NRQCD) factorization framework, we
investigate the inclusive production of the $h_c$ meson associated with either
light hadrons or charmed hadrons at $B$ factory energy $\sqrt{s}=10.58$ GeV.
Both the leading color-singlet and color-octet channels are included. For the
$h_c$ production associated with light hadrons, the total production rate is
dominated by the color-octet channel, thus the future measurement of this
process may impose useful constraint on the value of the color-octet matrix
element $<{\cal O}^{h_c}_8({}^1S_0)>$; for the $h_c$ production associated with
charmed hadrons, the total production rate is about one order of magnitude
smaller, and dominated by the color-singlet channel.
|
[
{
"created": "Mon, 25 Jun 2012 19:51:47 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Oct 2012 16:40:31 GMT",
"version": "v2"
}
] |
2015-06-05
|
[
[
"Jia",
"Yu",
""
],
[
"Sang",
"Wen-Long",
""
],
[
"Xu",
"Jia",
""
]
] |
Within the nonrelativistic QCD (NRQCD) factorization framework, we investigate the inclusive production of the $h_c$ meson associated with either light hadrons or charmed hadrons at $B$ factory energy $\sqrt{s}=10.58$ GeV. Both the leading color-singlet and color-octet channels are included. For the $h_c$ production associated with light hadrons, the total production rate is dominated by the color-octet channel, thus the future measurement of this process may impose useful constraint on the value of the color-octet matrix element $<{\cal O}^{h_c}_8({}^1S_0)>$; for the $h_c$ production associated with charmed hadrons, the total production rate is about one order of magnitude smaller, and dominated by the color-singlet channel.
|
1612.00195
|
Zhi-Gang Wang
|
Zhi-Gang Wang
|
Analysis of the mass and width of the $Y(4274)$ as axialvector
molecule-like state
|
16 pages, 4 figures. arXiv admin note: text overlap with
arXiv:1607.00701
|
Eur. Phys. J. C77 (2017) 174
|
10.1140/epjc/s10052-017-4751-7
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this article, we assign the $Y(4274)$ to be the color octet-octet type
axialvector molecule-like state with $J^{PC}=1^{++}$ tentatively, and construct
the color octet-octet type axialvector current to study its mass and width with
the QCD sum rules in details. The predicted mass favors assigning the $Y(4274)$
to be the color octet-octet type molecule-like state, but the predicted width
disfavors assigning the $Y(4274)$ to be the color octet-octet type
molecule-like state strongly. The $Y(4274)$ may be the conventional charmonium
state $\chi_{c1}(\rm 3P)$, and it is important to observe the decay $Y(4274)\to
J/\psi \omega$ to diagnose the nature of the $Y(4274)$.
|
[
{
"created": "Thu, 1 Dec 2016 10:31:43 GMT",
"version": "v1"
},
{
"created": "Sun, 8 Jan 2017 02:21:19 GMT",
"version": "v2"
},
{
"created": "Fri, 17 Feb 2017 01:11:22 GMT",
"version": "v3"
}
] |
2017-03-21
|
[
[
"Wang",
"Zhi-Gang",
""
]
] |
In this article, we assign the $Y(4274)$ to be the color octet-octet type axialvector molecule-like state with $J^{PC}=1^{++}$ tentatively, and construct the color octet-octet type axialvector current to study its mass and width with the QCD sum rules in details. The predicted mass favors assigning the $Y(4274)$ to be the color octet-octet type molecule-like state, but the predicted width disfavors assigning the $Y(4274)$ to be the color octet-octet type molecule-like state strongly. The $Y(4274)$ may be the conventional charmonium state $\chi_{c1}(\rm 3P)$, and it is important to observe the decay $Y(4274)\to J/\psi \omega$ to diagnose the nature of the $Y(4274)$.
|
1104.2574
|
Hans-Peter Morsch
|
Hans-Peter Morsch
|
Explicit Bound State Description of Particles, Application to p-e- and
e+-e- Systems
|
15 pages, 4 figures
|
Boson Journal of Modern Physics 3,1: 197 (2017) (open access)
| null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Based on a QED Lagrangian with additional photon-photon coupling an explicit
bound state description is presented, attempting a physical correct and
parameter free description of free particles. Applied to p-e- and e+-e-
systems, with a "harmonic" boundary condition the deduced binding energies are
consistent with Coulomb energies and radii in general agreement with other
models. The sum of partial coupling strengths is in good agreement with
alpha_QED sim 1/137, showing that this important constant can be deduced from
first principles.
|
[
{
"created": "Fri, 1 Apr 2011 11:15:43 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Jul 2011 14:34:58 GMT",
"version": "v2"
},
{
"created": "Wed, 9 Nov 2011 15:40:30 GMT",
"version": "v3"
},
{
"created": "Mon, 22 Jul 2013 13:13:12 GMT",
"version": "v4"
},
{
"created": "Thu, 2 Jul 2015 08:49:58 GMT",
"version": "v5"
}
] |
2017-05-11
|
[
[
"Morsch",
"Hans-Peter",
""
]
] |
Based on a QED Lagrangian with additional photon-photon coupling an explicit bound state description is presented, attempting a physical correct and parameter free description of free particles. Applied to p-e- and e+-e- systems, with a "harmonic" boundary condition the deduced binding energies are consistent with Coulomb energies and radii in general agreement with other models. The sum of partial coupling strengths is in good agreement with alpha_QED sim 1/137, showing that this important constant can be deduced from first principles.
|
hep-ph/0512209
|
Kimball A. Milton
|
K. A. Milton, I. L. Solovtsov, and O. P. Solovtsova
|
An analytic method of describing $R$-related quantities in QCD
|
16 pages, 6 eps figures, references added
|
Mod.Phys.Lett.A21:1355-1368,2006
|
10.1142/S0217732306020767
| null |
hep-ph
| null |
A model based on the analytic approach to QCD, involving a summation of
threshold singularities and taking into account the nonperturbative character
of the light quark masses, is applied to find hadronic contributions to
different physical quantities. It is shown that the suggested model allows us
to describe well such objects as the hadronic contribution to the anomalous
magnetic moment of the muon, the ratio of hadronic to leptonic $\tau$-decay
widths in the vector channel, the Adler $D$-function, the smeared
$R_\Delta$-function, and the hadronic contribution to the evolution of the fine
structure constant.
|
[
{
"created": "Thu, 15 Dec 2005 23:31:05 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Dec 2005 15:47:00 GMT",
"version": "v2"
},
{
"created": "Fri, 30 Dec 2005 21:33:22 GMT",
"version": "v3"
}
] |
2009-11-11
|
[
[
"Milton",
"K. A.",
""
],
[
"Solovtsov",
"I. L.",
""
],
[
"Solovtsova",
"O. P.",
""
]
] |
A model based on the analytic approach to QCD, involving a summation of threshold singularities and taking into account the nonperturbative character of the light quark masses, is applied to find hadronic contributions to different physical quantities. It is shown that the suggested model allows us to describe well such objects as the hadronic contribution to the anomalous magnetic moment of the muon, the ratio of hadronic to leptonic $\tau$-decay widths in the vector channel, the Adler $D$-function, the smeared $R_\Delta$-function, and the hadronic contribution to the evolution of the fine structure constant.
|
hep-ph/0512273
|
Anton Rebhan
|
Andreas Gerhold, Andreas Ipp, Anton Rebhan
|
Thermodynamics of QCD at large quark chemical potential
|
19 pages, 12 figures. Invited talk given by A. Rebhan at the 29th
Johns Hopkins Workshop on Current Problems in Particle Theory, Budapest,
August 1-3, 2005
| null | null |
TUW-05-21, ECT*-05-27
|
hep-ph
| null |
We review the existing weak-coupling results on the thermodynamic potential
of deconfined QCD at small and large quark chemical potential and compare with
results from lattice gauge theory as well as the exactly solvable case of
large-N_f QCD. We also discuss the new analytical results on non-Fermi-liquid
effects in entropy and specific heat as well as in dispersion laws of quark
quasiparticles at large quark chemical potential.
|
[
{
"created": "Wed, 21 Dec 2005 10:44:06 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Gerhold",
"Andreas",
""
],
[
"Ipp",
"Andreas",
""
],
[
"Rebhan",
"Anton",
""
]
] |
We review the existing weak-coupling results on the thermodynamic potential of deconfined QCD at small and large quark chemical potential and compare with results from lattice gauge theory as well as the exactly solvable case of large-N_f QCD. We also discuss the new analytical results on non-Fermi-liquid effects in entropy and specific heat as well as in dispersion laws of quark quasiparticles at large quark chemical potential.
|
0705.2887
|
Wolfgang Sch\"afer
|
W. Sch\"afer, A. Szczurek
|
Exclusive photoproduction of $J/\psi$ in proton-proton and
proton-antiproton scattering
|
22 pages, 20 figures; dedicated to Kolya Nikolaev on the occasion of
his 60th birthday; 4 figures and discussion added
|
Phys.Rev.D76:094014,2007
|
10.1103/PhysRevD.76.094014
| null |
hep-ph
| null |
Protons and antiprotons at collider energies are a source of high energy
Weizs\"acker--Williams photons. This may open a possibility to study exclusive
photoproduction of heavy vector mesons at energies much larger than possible at
the HERA accelerator. Here we present a detailed investigation of the exclusive
$J/\psi$ photoproduction in proton-proton (RHIC, LHC) and proton-antiproton
(Tevatron) collisions. We calculate several differential distributions in $t_1,
t_2, y, \phi$, as well as transverse momentum distributions of $J/\Psi$'s. We
discuss correlations in the azimuthal angle between outgoing protons or proton
and antiproton as well as in the ($t_1, t_2$) space. Differently from
electroproduction experiments, here both colliding beam particles can be a
source of photons, and we find large interference terms in azimuthal angle
distributions in a broad range of rapidities of the produced meson. We also
include the spin--flip parts in the electromagnetic vertices. We discuss the
effect of absorptive corrections on various distributions. Interestingly,
absorption corrections induce a charge asymmetry in rapidity distributions, and
are larger for $p p$ reactions than for the $p \bar p$ case. The reaction
considered here constitutes an important nonreduceable background in recently
proposed searches for odderon exchange.
|
[
{
"created": "Sun, 20 May 2007 19:57:37 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Aug 2007 10:03:24 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Schäfer",
"W.",
""
],
[
"Szczurek",
"A.",
""
]
] |
Protons and antiprotons at collider energies are a source of high energy Weizs\"acker--Williams photons. This may open a possibility to study exclusive photoproduction of heavy vector mesons at energies much larger than possible at the HERA accelerator. Here we present a detailed investigation of the exclusive $J/\psi$ photoproduction in proton-proton (RHIC, LHC) and proton-antiproton (Tevatron) collisions. We calculate several differential distributions in $t_1, t_2, y, \phi$, as well as transverse momentum distributions of $J/\Psi$'s. We discuss correlations in the azimuthal angle between outgoing protons or proton and antiproton as well as in the ($t_1, t_2$) space. Differently from electroproduction experiments, here both colliding beam particles can be a source of photons, and we find large interference terms in azimuthal angle distributions in a broad range of rapidities of the produced meson. We also include the spin--flip parts in the electromagnetic vertices. We discuss the effect of absorptive corrections on various distributions. Interestingly, absorption corrections induce a charge asymmetry in rapidity distributions, and are larger for $p p$ reactions than for the $p \bar p$ case. The reaction considered here constitutes an important nonreduceable background in recently proposed searches for odderon exchange.
|
1510.06954
|
Kim Maltman
|
K. Maltman, R.J. Hudspith, R. Lewis, C.E. Wolfe, J. Zanotti
|
A resolution of the inclusive flavor-breaking sum rule $\tau$ $V_{us}$
puzzle
|
7 pages, 4 figures. Presented at the 33rd International Symposium on
Lattice Field Theory, Kobe, Japan
| null | null | null |
hep-ph hep-ex hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A combination of continuum and lattice methods is used to investigate
systematic issues in the finite-energy-sum-rule determination of $V_{us}$ based
on flavor-breaking combinations of hadronic $\tau$ decay data. Results for
$V_{us}$ obtained using assumptions for $D>4$ OPE contributions employed in
previous conventional implementations of this approach are shown to display
significant unphysical dependences on the choice of sum rule weight, $w$, and
upper limit, $s_0$, of the relevant experimental spectral integrals. Continuum
and lattice results suggest the necessity of a new implementation of the
flavor-breaking sum rule approach, in which not only $\vert V_{us}\vert$, but
also $D>4$ effective condensates are fit to data. Lattice results also provide
a means of quantifying the truncation error for the slowly converging $D=2$ OPE
series. The new implementation is shown to produce $\vert V_{us}\vert$ results
free of unphysical $s_0$- and $w$-dependences and typically $\sim 0.0020$
higher than the (unstable) results found using the conventional implementation.
With preliminary new experimental results for the $K\pi$ branching fraction,
the resulting $\vert V_{us}\vert$ is in excellent agreement with that obtained
from $K_{\ell 3}$, and compatible within errors with expectations from
three-family unitarity.
|
[
{
"created": "Fri, 23 Oct 2015 14:50:00 GMT",
"version": "v1"
}
] |
2015-10-26
|
[
[
"Maltman",
"K.",
""
],
[
"Hudspith",
"R. J.",
""
],
[
"Lewis",
"R.",
""
],
[
"Wolfe",
"C. E.",
""
],
[
"Zanotti",
"J.",
""
]
] |
A combination of continuum and lattice methods is used to investigate systematic issues in the finite-energy-sum-rule determination of $V_{us}$ based on flavor-breaking combinations of hadronic $\tau$ decay data. Results for $V_{us}$ obtained using assumptions for $D>4$ OPE contributions employed in previous conventional implementations of this approach are shown to display significant unphysical dependences on the choice of sum rule weight, $w$, and upper limit, $s_0$, of the relevant experimental spectral integrals. Continuum and lattice results suggest the necessity of a new implementation of the flavor-breaking sum rule approach, in which not only $\vert V_{us}\vert$, but also $D>4$ effective condensates are fit to data. Lattice results also provide a means of quantifying the truncation error for the slowly converging $D=2$ OPE series. The new implementation is shown to produce $\vert V_{us}\vert$ results free of unphysical $s_0$- and $w$-dependences and typically $\sim 0.0020$ higher than the (unstable) results found using the conventional implementation. With preliminary new experimental results for the $K\pi$ branching fraction, the resulting $\vert V_{us}\vert$ is in excellent agreement with that obtained from $K_{\ell 3}$, and compatible within errors with expectations from three-family unitarity.
|
0808.2540
|
Levent Selbuz
|
L. Selbuz and Z. Z. Aydin
|
Tau sleptons and Tau sneutrino Decays in MSSM under the Cosmological
Bounds
|
16 pages, 4 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the numerical investigation of the fermionic two-body decays of
tau sleptons $\tilde \tau_{1,2}$ and $\tau$ sneutrino in the Minimal
Supersymmetric Standard Model with complex parameters. In the analysis we
particularly take into account the cosmological bounds imposed by WMAP data. We
plot the CP-phase dependences for each fermionic two-body channel of $\tilde
\tau_{1,2}$ and $\tau$ sneutrino and speculate about the branching ratios and
total (two-body) decay widths. We find that the phase dependences of the decay
widths of the third family sleptons are quite significant which can provide
viable probes of additional CP sources. We also draw attention to the
polarization of the final-state tau in the $ \tilde \tau_{1,2}$ decays.
|
[
{
"created": "Tue, 19 Aug 2008 08:05:17 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Apr 2009 14:26:43 GMT",
"version": "v2"
},
{
"created": "Tue, 19 Jan 2010 08:28:30 GMT",
"version": "v3"
}
] |
2010-01-19
|
[
[
"Selbuz",
"L.",
""
],
[
"Aydin",
"Z. Z.",
""
]
] |
We present the numerical investigation of the fermionic two-body decays of tau sleptons $\tilde \tau_{1,2}$ and $\tau$ sneutrino in the Minimal Supersymmetric Standard Model with complex parameters. In the analysis we particularly take into account the cosmological bounds imposed by WMAP data. We plot the CP-phase dependences for each fermionic two-body channel of $\tilde \tau_{1,2}$ and $\tau$ sneutrino and speculate about the branching ratios and total (two-body) decay widths. We find that the phase dependences of the decay widths of the third family sleptons are quite significant which can provide viable probes of additional CP sources. We also draw attention to the polarization of the final-state tau in the $ \tilde \tau_{1,2}$ decays.
|
2008.00415
|
Surabhi Gupta
|
Surabhi Gupta (Aligarh Muslim University), Sudhir Kumar Gupta (Aligarh
Muslim University)
|
An Information Theoretic Exploration of Constrained MSSM
|
16 pages, 7 figures, 3 tables
|
Nucl.Phys.B 965 (2021) 115336
|
10.1016/j.nuclphysb.2021.115336
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss information theory as a tool to investigate constrained minimal
supersymmetric Standard Model (CMSSM) in the light of observation of Higgs
boson at the Large Hadron Collider. The entropy of the Higgs boson using its
various detection modes has been constructed as a measure of the information
and has been utilized to explore a wide range of CMSSM parameter space after
including various experimental constraints from the LEP data, B-physics,
electroweak precision observables and relic density of dark matter. According
to our study while the lightest neutralino is preferred to have a mass around
1.92 TeV, the gluino mass is estimated to be around 7.44 TeV. The values of
CMSSM parameters $m_0$, $m_{1/2}$, $A_0$ and $\tan\beta$ correspond to the most
preferred scenario are found to be about 6 TeV, 3.6 TeV, $-$6.9 TeV and 36.8
respectively.
|
[
{
"created": "Sun, 2 Aug 2020 06:53:48 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Aug 2020 16:03:23 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Aug 2020 14:50:56 GMT",
"version": "v3"
},
{
"created": "Fri, 19 Mar 2021 10:16:09 GMT",
"version": "v4"
}
] |
2022-08-25
|
[
[
"Gupta",
"Surabhi",
"",
"Aligarh Muslim University"
],
[
"Gupta",
"Sudhir Kumar",
"",
"Aligarh\n Muslim University"
]
] |
We discuss information theory as a tool to investigate constrained minimal supersymmetric Standard Model (CMSSM) in the light of observation of Higgs boson at the Large Hadron Collider. The entropy of the Higgs boson using its various detection modes has been constructed as a measure of the information and has been utilized to explore a wide range of CMSSM parameter space after including various experimental constraints from the LEP data, B-physics, electroweak precision observables and relic density of dark matter. According to our study while the lightest neutralino is preferred to have a mass around 1.92 TeV, the gluino mass is estimated to be around 7.44 TeV. The values of CMSSM parameters $m_0$, $m_{1/2}$, $A_0$ and $\tan\beta$ correspond to the most preferred scenario are found to be about 6 TeV, 3.6 TeV, $-$6.9 TeV and 36.8 respectively.
|
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.