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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9504275
|
San Fu
|
S. F. Tuan (University of Hawaii)
|
Search for the $\chi'_c$ Charmonium States as Solution to the CDF
$\psi'$ Puzzle
|
8 pages Latex File, No figures
|
Pramana 45 (1995) 209-214
|
10.1007/BF02848264
|
UH-511-827-95
|
hep-ph
| null |
The efforts of Roy-Sridhar-Close-Cho-Wise-Trivedi to resolve the CDF $\psi'$
anomaly with cascades from above-threshold $\chi^\prime_c$ states require well
defined signature states require well defined signatures [a small total width
and a large branching fraction for $\cp \ra \gamma + \pp]$ for the solution to
be viable. Here we estimte the production of such states from $BR (B \ra \cp +
X)BR (\cp \ra \gamma \pp)$ and $\gamma \gamma$ production of $\chi^\prime_{c2}$
at CLEO II, and comment on the feasbility of testing the hypothesis in terms of
current experimental capabilities.
|
[
{
"created": "Tue, 11 Apr 1995 00:27:06 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Tuan",
"S. F.",
"",
"University of Hawaii"
]
] |
The efforts of Roy-Sridhar-Close-Cho-Wise-Trivedi to resolve the CDF $\psi'$ anomaly with cascades from above-threshold $\chi^\prime_c$ states require well defined signature states require well defined signatures [a small total width and a large branching fraction for $\cp \ra \gamma + \pp]$ for the solution to be viable. Here we estimte the production of such states from $BR (B \ra \cp + X)BR (\cp \ra \gamma \pp)$ and $\gamma \gamma$ production of $\chi^\prime_{c2}$ at CLEO II, and comment on the feasbility of testing the hypothesis in terms of current experimental capabilities.
|
hep-ph/0304133
|
Sultan Catto
|
Sultan Catto
|
Mass Relations for the Quark-Diquark Model
|
4 pages, revtex; Invited talk given at XXIV International Colloquium
on Group Theoretical Methods in Physics (Paris, July 15-20, 2002)
| null | null | null |
hep-ph
| null |
Quark model with potentials derived from QCD, including the quark-diquark
model for excited hadrons gives mass formulae in very good agreement with
experiment and goes a long way in explaining the approximate symmetries and
supersymmetries of the hadronic spectrum, including the symmetry breaking
mechanism.
|
[
{
"created": "Mon, 14 Apr 2003 21:47:53 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Catto",
"Sultan",
""
]
] |
Quark model with potentials derived from QCD, including the quark-diquark model for excited hadrons gives mass formulae in very good agreement with experiment and goes a long way in explaining the approximate symmetries and supersymmetries of the hadronic spectrum, including the symmetry breaking mechanism.
|
1910.13759
|
Francesco Hautmann
|
E. Accomando, F. Coradeschi, T. Cridge, J. Fiaschi, F. Hautmann, S.
Moretti, C. Shepherd-Themistocleous, C. Voisey
|
Production of Z'-Boson Resonances with Large Width at the LHC
|
9 pages, 4 figures
| null |
10.1016/j.physletb.2020.135293
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Di-lepton searches for Beyond the Standard Model (BSM) Z' bosons that rely on
the analysis of the Breit-Wigner (BW) line shape are appropriate in the case of
narrow resonances, but likely not sufficient in scenarios featuring Z' states
with large widths. Conversely, alternative experimental strategies applicable
to wide Z' resonances are much more dependent than the default bump search
analyses on the modelling of QCD higher-order corrections to the production
processes, for both signal and background. For heavy Z' boson searches in the
di-lepton channel at the CERN Large Hadron Collider (LHC), the transverse
momentum q_T of the di-lepton system peaks at q_T \ltap 10^{-2} M_{ll}, where
M_{ll} is the di-lepton invariant mass. We exploit this to treat the QCD
corrections by using the logarithmic resummation methods in M_{ll} / q_T to all
orders in the strong coupling constant \alpha_s. We carry out studies of Z'
states with large width at the LHC by employing the program {\tt reSolve},
which performs QCD transverse momentum resummation up to
Next-to-Next-to-Leading Logarithmic (NNLL) accuracy. We consider two benchmark
BSM scenarios, based on the Sequential Standard Model (SSM) and dubbed `SSM
wide' and `SSM enhanced'. We present results for the shape and size of Z' boson
signals at the differential level, mapped in both cross section (\sigma) and
Forward-Backward Asymmetry (A_{\rm FB}), and perform numerical investigations
of the experimental sensitivity at the LHC Run 3 and High-Luminosity LHC
(HL-LHC).
|
[
{
"created": "Wed, 30 Oct 2019 10:31:26 GMT",
"version": "v1"
}
] |
2020-03-18
|
[
[
"Accomando",
"E.",
""
],
[
"Coradeschi",
"F.",
""
],
[
"Cridge",
"T.",
""
],
[
"Fiaschi",
"J.",
""
],
[
"Hautmann",
"F.",
""
],
[
"Moretti",
"S.",
""
],
[
"Shepherd-Themistocleous",
"C.",
""
],
[
"Voisey",
"C.",
""
]
] |
Di-lepton searches for Beyond the Standard Model (BSM) Z' bosons that rely on the analysis of the Breit-Wigner (BW) line shape are appropriate in the case of narrow resonances, but likely not sufficient in scenarios featuring Z' states with large widths. Conversely, alternative experimental strategies applicable to wide Z' resonances are much more dependent than the default bump search analyses on the modelling of QCD higher-order corrections to the production processes, for both signal and background. For heavy Z' boson searches in the di-lepton channel at the CERN Large Hadron Collider (LHC), the transverse momentum q_T of the di-lepton system peaks at q_T \ltap 10^{-2} M_{ll}, where M_{ll} is the di-lepton invariant mass. We exploit this to treat the QCD corrections by using the logarithmic resummation methods in M_{ll} / q_T to all orders in the strong coupling constant \alpha_s. We carry out studies of Z' states with large width at the LHC by employing the program {\tt reSolve}, which performs QCD transverse momentum resummation up to Next-to-Next-to-Leading Logarithmic (NNLL) accuracy. We consider two benchmark BSM scenarios, based on the Sequential Standard Model (SSM) and dubbed `SSM wide' and `SSM enhanced'. We present results for the shape and size of Z' boson signals at the differential level, mapped in both cross section (\sigma) and Forward-Backward Asymmetry (A_{\rm FB}), and perform numerical investigations of the experimental sensitivity at the LHC Run 3 and High-Luminosity LHC (HL-LHC).
|
2012.04655
|
Dominik Stamen
|
Maximilian Dax, Dominik Stamen, Bastian Kubis
|
Dispersive analysis of the Primakoff reaction $\gamma K \to K \pi$
|
17 pages, 8 figures; version published in EPJC
|
Eur. Phys. J. C 81 (2021) 221
|
10.1140/epjc/s10052-021-08951-x
| null |
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We provide a dispersion-theoretical representation of the reaction amplitudes
$\gamma K\to K \pi$ in all charge channels, based on modern pion-kaon $P$-wave
phase shift input. Crossed-channel singularities are fixed from phenomenology
as far as possible. We demonstrate how the subtraction constants can be matched
to a low-energy theorem and radiative couplings of the $K^*(892)$ resonances,
thereby providing a model-independent framework for future analyses of
high-precision kaon Primakoff data.
|
[
{
"created": "Tue, 8 Dec 2020 19:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Mar 2021 10:33:14 GMT",
"version": "v2"
}
] |
2021-03-10
|
[
[
"Dax",
"Maximilian",
""
],
[
"Stamen",
"Dominik",
""
],
[
"Kubis",
"Bastian",
""
]
] |
We provide a dispersion-theoretical representation of the reaction amplitudes $\gamma K\to K \pi$ in all charge channels, based on modern pion-kaon $P$-wave phase shift input. Crossed-channel singularities are fixed from phenomenology as far as possible. We demonstrate how the subtraction constants can be matched to a low-energy theorem and radiative couplings of the $K^*(892)$ resonances, thereby providing a model-independent framework for future analyses of high-precision kaon Primakoff data.
|
hep-ph/0105278
|
Biswajoy Brahmachari
|
Biswajoy Brahmachari, Ernest Ma, Utpal Sarkar
|
Supersymmetric Model of Neutrino Mass and Leptogenesis with String-Scale
Unification
|
Improved by including constraints imposed by gravitino decay, new
references added, corrections and changes made. Accepted for publication in
Physics Letters. B
|
Phys.Lett.B520:152-158,2001
|
10.1016/S0370-2693(01)01123-6
|
SINP/TNP/01-11, UCRHEP-T307,IC/2001/33
|
hep-ph astro-ph hep-th
| null |
Adjoint supermultiplets (1,3,0) and (8,1,0) modify the evolution of gauge
couplings. If the unification of gauge couplings occurs at the string scale,
their masses are fixed at around $10^{13}$ GeV. This scale coincides with
expected gaugino condensation scale in the hidden sector $M_{string}^{2/3}
m^{1/3}_{3/2} \sim 10^{13}$ GeV. We show how neutrino masses arise in this
unified model which naturally explain the present atmospheric and solar
neutrino data. The out-of-equilibrium decay of the superfield (1,3,0) at
$10^{13}$ GeV may also lead to a lepton asymmetry which then gets converted
into the present observed baryon asymmetry of the Universe.
|
[
{
"created": "Sun, 27 May 2001 11:46:25 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Aug 2001 12:43:50 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Brahmachari",
"Biswajoy",
""
],
[
"Ma",
"Ernest",
""
],
[
"Sarkar",
"Utpal",
""
]
] |
Adjoint supermultiplets (1,3,0) and (8,1,0) modify the evolution of gauge couplings. If the unification of gauge couplings occurs at the string scale, their masses are fixed at around $10^{13}$ GeV. This scale coincides with expected gaugino condensation scale in the hidden sector $M_{string}^{2/3} m^{1/3}_{3/2} \sim 10^{13}$ GeV. We show how neutrino masses arise in this unified model which naturally explain the present atmospheric and solar neutrino data. The out-of-equilibrium decay of the superfield (1,3,0) at $10^{13}$ GeV may also lead to a lepton asymmetry which then gets converted into the present observed baryon asymmetry of the Universe.
|
1611.06165
|
Martin Hentschinski
|
Martin Hentschinski
|
The growth with energy of exclusive $J/\Psi$ and $\Upsilon$
photo-production cross-sections and BFKL evolution
|
4 pages, 4 figures; Proceedings of the International Workshop on
Diffraction in High-Energy Physics (DIFFRACTION 2016), September 2 - 8, 2016,
Acireale (Italy)
| null |
10.1063/1.4977130
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate whether NLO BFKL evolution is capable to describe the energy
dependence of the exclusive photo-production cross-section of vector mesons
$J/\Psi$ and $\Upsilon$ on protons. Our description is based on available NLO
BFKL fits of the proton impact factor in inclusive DIS, which allow us to
construct the necessary scattering amplitude at zero momentum transfer $t=0$.
Assuming an exponential drop-off with $t$, this result allows us to calculate
the exclusive photoproduction cross-section. Comparing our results with both
HERA data (measured by H1 and ZEUS collaborations in $ep$ collision) and LHC
data (measured by ALICE, CMS and LHCb collaborations in ultra-peripheral $pp$
and $pPb$ collision) we find that our framework provides a very good
description of the energy dependence of the $J/\Psi$ and $\Upsilon$
photoproduction cross-section, providing therefore further evidence for BFKL
evolution at the LHC. The available fits of the proton impact factor require on
the other hand an adjustment in the overall normalization.
|
[
{
"created": "Fri, 18 Nov 2016 17:20:22 GMT",
"version": "v1"
}
] |
2017-04-05
|
[
[
"Hentschinski",
"Martin",
""
]
] |
We investigate whether NLO BFKL evolution is capable to describe the energy dependence of the exclusive photo-production cross-section of vector mesons $J/\Psi$ and $\Upsilon$ on protons. Our description is based on available NLO BFKL fits of the proton impact factor in inclusive DIS, which allow us to construct the necessary scattering amplitude at zero momentum transfer $t=0$. Assuming an exponential drop-off with $t$, this result allows us to calculate the exclusive photoproduction cross-section. Comparing our results with both HERA data (measured by H1 and ZEUS collaborations in $ep$ collision) and LHC data (measured by ALICE, CMS and LHCb collaborations in ultra-peripheral $pp$ and $pPb$ collision) we find that our framework provides a very good description of the energy dependence of the $J/\Psi$ and $\Upsilon$ photoproduction cross-section, providing therefore further evidence for BFKL evolution at the LHC. The available fits of the proton impact factor require on the other hand an adjustment in the overall normalization.
|
1104.4560
|
Jeonghyeon Song
|
Sanghyeon Chang, Kang Young Lee and Jeonghyeon Song
|
The CDF dijet excess and Z'_{cs} coupled to the second generation quarks
|
references added
| null |
10.3938/jkps.59.2219
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently the CDF collaboration has reported the excess in the dijet
invariant-mass distribution of the Wjj events, corresponding to a significance
of 3.2 standard deviations. Considering the lack of similar excesses in the
$\gamma jj$ and $Z jj$ events yet, we propose a new Z' model: Z' couples only
to the second generation quarks. Single production of $\zsc$ as well as
associated production with $W,\gamma, Z$ are mainly from the sea quarks. Only
$W Z'$ production has additional contribution from one valence quark and one
sea quark, which is allowed by CKM mixing. We found that if the new gauge
coupling is large enough, marginally permitted by perturbativity, this new
model can explain the observed CDF $Wjj$ anomaly as well as the lack of $\gm
jj$ and $Z jj$ anomalies. Vanishing coupling of Z'-b-b protects this model from
the constraint of p pbar ->WH -> l\nu b \bar{b}.
|
[
{
"created": "Sat, 23 Apr 2011 14:08:33 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Apr 2011 08:24:48 GMT",
"version": "v2"
}
] |
2018-02-14
|
[
[
"Chang",
"Sanghyeon",
""
],
[
"Lee",
"Kang Young",
""
],
[
"Song",
"Jeonghyeon",
""
]
] |
Recently the CDF collaboration has reported the excess in the dijet invariant-mass distribution of the Wjj events, corresponding to a significance of 3.2 standard deviations. Considering the lack of similar excesses in the $\gamma jj$ and $Z jj$ events yet, we propose a new Z' model: Z' couples only to the second generation quarks. Single production of $\zsc$ as well as associated production with $W,\gamma, Z$ are mainly from the sea quarks. Only $W Z'$ production has additional contribution from one valence quark and one sea quark, which is allowed by CKM mixing. We found that if the new gauge coupling is large enough, marginally permitted by perturbativity, this new model can explain the observed CDF $Wjj$ anomaly as well as the lack of $\gm jj$ and $Z jj$ anomalies. Vanishing coupling of Z'-b-b protects this model from the constraint of p pbar ->WH -> l\nu b \bar{b}.
|
hep-ph/0210094
|
Valery Khoze
|
V.A. Khoze, A.D. Martin and M.G. Ryskin
|
Physics with forward protons at hadron colliders
|
5 pages; Presented at the 31st International Conference on High
Energy Physics (ICHEP02), Amsterdam, Netherlands, 24-31 July, 2002
| null |
10.1016/S0920-5632(03)90549-4
|
IPPP/02/57, DCPT/02/114
|
hep-ph
| null |
We emphasize the importance of tagging the outgoing forward protons to
sharpen the predictions for New Physics at the LHC. We show that exclusive
double-diffractive Higgs production, pp-->p+H+p, followed by the H-->bb decay,
could play an important role in identifying a 'light' Higgs boson.
|
[
{
"created": "Mon, 7 Oct 2002 08:34:41 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Khoze",
"V. A.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Ryskin",
"M. G.",
""
]
] |
We emphasize the importance of tagging the outgoing forward protons to sharpen the predictions for New Physics at the LHC. We show that exclusive double-diffractive Higgs production, pp-->p+H+p, followed by the H-->bb decay, could play an important role in identifying a 'light' Higgs boson.
|
hep-ph/0701039
|
Leonid Glozman
|
R. F. Wagenbrunn and L. Ya. Glozman
|
Chiral symmetry patterns of excited mesons with the Coulomb-like linear
confinement
|
1. Order of references has been changed and one reference has been
added; 2. A short discussion of nonrelativistic and semirelativistic quark
models has been added in the conclusion part on referee's request. To appear
in Phys. Rev. D
|
Phys.Rev.D75:036007,2007
|
10.1103/PhysRevD.75.036007
| null |
hep-ph hep-ex hep-lat hep-th nucl-th
| null |
The spectrum of $\bar q q$ mesons in a model where the only interaction is a
linear Coulomb-like instantaneous confining potential is studied. The
single-quark Green function as well as the dynamical chiral symmetry breaking
are obtained from the Schwinger-Dyson (gap) equation. Given the dressed quark
propagator, a complete spectrum of "usual" mesons is obtained from the
Bethe-Salpeter equation. The spectrum exhibits restoration of chiral and
$U(1)_A$ symmetries at large spins and/or radial excitations. This property is
demonstrated both analytically and numerically. At large spins and/or radial
excitations higher degree of degeneracy is observed, namely all states with the
given spin fall into reducible representations $[(0,1/2) \oplus (1/2,0)] \times
[(0,1/2) \oplus (1/2,0)]$ that combine all possible chiral multiplets with the
given $J$ and $n$. The structure of the meson wave functions as well as the
form of the angular and radial Regge trajectories are investigated.
|
[
{
"created": "Fri, 5 Jan 2007 10:30:19 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Jan 2007 11:52:36 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Wagenbrunn",
"R. F.",
""
],
[
"Glozman",
"L. Ya.",
""
]
] |
The spectrum of $\bar q q$ mesons in a model where the only interaction is a linear Coulomb-like instantaneous confining potential is studied. The single-quark Green function as well as the dynamical chiral symmetry breaking are obtained from the Schwinger-Dyson (gap) equation. Given the dressed quark propagator, a complete spectrum of "usual" mesons is obtained from the Bethe-Salpeter equation. The spectrum exhibits restoration of chiral and $U(1)_A$ symmetries at large spins and/or radial excitations. This property is demonstrated both analytically and numerically. At large spins and/or radial excitations higher degree of degeneracy is observed, namely all states with the given spin fall into reducible representations $[(0,1/2) \oplus (1/2,0)] \times [(0,1/2) \oplus (1/2,0)]$ that combine all possible chiral multiplets with the given $J$ and $n$. The structure of the meson wave functions as well as the form of the angular and radial Regge trajectories are investigated.
|
1611.08450
|
Philipp Sicking
|
Heinrich P\"as, Philipp Sicking
|
Discriminating sterile neutrinos and unitarity violation with CP
invariants
|
13 pages, 2 figures
|
Phys. Rev. D 95, 075004 (2017)
|
10.1103/PhysRevD.95.075004
|
DO-TH 16/31
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a new method to analyze upcoming results in the search for CP
violating neutrino oscillations. The CP violating amplitudes
$\mathcal{A}_{\alpha\beta}^{kj}$ provide parametrization independent
observables, which will be accessible by experiments soon. The strong
prediction of a unique $\mathcal{A}_{\alpha\beta}^{kj}$ (the Jarlskog
invariant) in case of the standard three neutrino model does not hold in models
with new physics beyond the Standard Model. Nevertheless there are still
correlations among the amplitudes depending on the specific model. Due to these
correlations it is possible to reject specific new physics models by
determining only 3 of the CP violating amplitudes.
|
[
{
"created": "Fri, 25 Nov 2016 13:29:31 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Dec 2016 10:58:25 GMT",
"version": "v2"
}
] |
2017-04-12
|
[
[
"Päs",
"Heinrich",
""
],
[
"Sicking",
"Philipp",
""
]
] |
We present a new method to analyze upcoming results in the search for CP violating neutrino oscillations. The CP violating amplitudes $\mathcal{A}_{\alpha\beta}^{kj}$ provide parametrization independent observables, which will be accessible by experiments soon. The strong prediction of a unique $\mathcal{A}_{\alpha\beta}^{kj}$ (the Jarlskog invariant) in case of the standard three neutrino model does not hold in models with new physics beyond the Standard Model. Nevertheless there are still correlations among the amplitudes depending on the specific model. Due to these correlations it is possible to reject specific new physics models by determining only 3 of the CP violating amplitudes.
|
2208.11134
|
Alejo Rossia
|
Fady Bishara, Philipp Englert, Christophe Grojean, Giuliano Panico and
Alejo N. Rossia
|
Revisiting $\mathbf{Vh(\rightarrow b \bar b)}$ at the LHC and FCC-hh
|
21 + 23 pages, 14 figures, 34 tables, 6 appendices. v2: added
clarifications, minor corrections, conclusions unchanged, matches published
version
|
JHEP06(2023)077
|
10.1007/JHEP06(2023)077
|
DESY 22-136, HU-EP-22/27
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Diboson production processes provide good targets for precision measurements
at present and future hadron colliders. We consider $Vh$ production, focusing
on the $h \to b\bar b$ decay channel, whose sizeable cross section makes it
accessible at the LHC. We perform an improved analysis by combining the 0-, 1-
and 2-lepton channels with a scale-invariant $b$-tagging algorithm that allows
us to exploit events with either a boosted Higgs via mass-drop tagging or
resolved $b$-jets. This strategy gives sensitivity to 4 dimension-6 SMEFT
operators that modify the $W$ and $Z$ couplings to quarks and is competitive
with the bounds obtained from global fits. The benefit of the $h\to b\bar b$
decay channel is the fact that it is the only $Vh$ channel accessible at the
LHC Run 3 and HL-LHC, while at FCC-hh it is competitive with the effectively
background-free $h\to \gamma\gamma$ channel assuming $\lesssim 5$% systematic
uncertainty. Combining the boosted and resolved categories yields a 17%
improvement on the most strongly bounded Wilson coefficient at the LHC Run 3
with respect to the boosted category alone (and a 7% improvement at FCC-hh). We
also show that, at FCC-hh, a binning in the rapidity of the $Vh$ system can
significantly reduce correlations between some EFT operators. The bounds we
obtain translate to a lower bound on the new physics scale of $5$, $8$, and
$20$ TeV at the LHC Run 3, HL-LHC, and FCC-hh respectively, assuming
new-physics couplings of order unity. Finally, we assess the impact of the $Vh$
production channel on anomalous triple gauge coupling measurements, comparing
with their determination at lepton colliders.
|
[
{
"created": "Tue, 23 Aug 2022 18:00:02 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Jun 2023 16:05:15 GMT",
"version": "v2"
}
] |
2023-06-19
|
[
[
"Bishara",
"Fady",
""
],
[
"Englert",
"Philipp",
""
],
[
"Grojean",
"Christophe",
""
],
[
"Panico",
"Giuliano",
""
],
[
"Rossia",
"Alejo N.",
""
]
] |
Diboson production processes provide good targets for precision measurements at present and future hadron colliders. We consider $Vh$ production, focusing on the $h \to b\bar b$ decay channel, whose sizeable cross section makes it accessible at the LHC. We perform an improved analysis by combining the 0-, 1- and 2-lepton channels with a scale-invariant $b$-tagging algorithm that allows us to exploit events with either a boosted Higgs via mass-drop tagging or resolved $b$-jets. This strategy gives sensitivity to 4 dimension-6 SMEFT operators that modify the $W$ and $Z$ couplings to quarks and is competitive with the bounds obtained from global fits. The benefit of the $h\to b\bar b$ decay channel is the fact that it is the only $Vh$ channel accessible at the LHC Run 3 and HL-LHC, while at FCC-hh it is competitive with the effectively background-free $h\to \gamma\gamma$ channel assuming $\lesssim 5$% systematic uncertainty. Combining the boosted and resolved categories yields a 17% improvement on the most strongly bounded Wilson coefficient at the LHC Run 3 with respect to the boosted category alone (and a 7% improvement at FCC-hh). We also show that, at FCC-hh, a binning in the rapidity of the $Vh$ system can significantly reduce correlations between some EFT operators. The bounds we obtain translate to a lower bound on the new physics scale of $5$, $8$, and $20$ TeV at the LHC Run 3, HL-LHC, and FCC-hh respectively, assuming new-physics couplings of order unity. Finally, we assess the impact of the $Vh$ production channel on anomalous triple gauge coupling measurements, comparing with their determination at lepton colliders.
|
1406.0524
|
Riccardo Catena
|
Riccardo Catena
|
Prospects for direct detection of dark matter in an effective theory
approach
|
23 pages, 7 figures, replaced to match the published version
|
JCAP 1407 (2014) 055
|
10.1088/1475-7516/2014/07/055
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform the first comprehensive analysis of the prospects for direct
detection of dark matter with future ton-scale detectors in the general
11-dimensional effective theory of isoscalar dark matter-nucleon interactions
mediated by a heavy spin-1 or spin-0 particle. The theory includes 8 momentum
and velocity dependent dark matter-nucleon interaction operators, besides the
familiar spin-independent and spin-dependent operators. From a variegated
sample of 27 benchmark points selected in the parameter space of the theory, we
simulate independent sets of synthetic data for ton-scale Germanium and Xenon
detectors. From the synthetic data, we then extract the marginal posterior
probability density functions and the profile likelihoods of the model
parameters. The associated Bayesian credible regions and frequentist confidence
intervals allow us to assess the prospects for direct detection of dark matter
at the 27 benchmark points. First, we analyze the data assuming the knowledge
of the correct dark matter nucleon-interaction type, as it is commonly done for
the familiar spin-independent and spin-dependent interactions. Then, we analyze
the simulations extracting the dark matter-nucleon interaction type from the
data directly, in contrast to standard analyses. This second approach requires
an extensive exploration of the full 11-dimensional parameter space of the dark
matter-nucleon effective theory. Interestingly, we identify 5 scenarios where
the dark matter mass and the dark matter-nucleon interaction type can be
reconstructed from the data simultaneously. We stress the importance of
extracting the dark matter nucleon-interaction type from the data directly,
discussing the main challenges found addressing this complex 11-dimensional
problem.
|
[
{
"created": "Mon, 2 Jun 2014 20:15:34 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jul 2015 14:44:47 GMT",
"version": "v2"
}
] |
2015-07-20
|
[
[
"Catena",
"Riccardo",
""
]
] |
We perform the first comprehensive analysis of the prospects for direct detection of dark matter with future ton-scale detectors in the general 11-dimensional effective theory of isoscalar dark matter-nucleon interactions mediated by a heavy spin-1 or spin-0 particle. The theory includes 8 momentum and velocity dependent dark matter-nucleon interaction operators, besides the familiar spin-independent and spin-dependent operators. From a variegated sample of 27 benchmark points selected in the parameter space of the theory, we simulate independent sets of synthetic data for ton-scale Germanium and Xenon detectors. From the synthetic data, we then extract the marginal posterior probability density functions and the profile likelihoods of the model parameters. The associated Bayesian credible regions and frequentist confidence intervals allow us to assess the prospects for direct detection of dark matter at the 27 benchmark points. First, we analyze the data assuming the knowledge of the correct dark matter nucleon-interaction type, as it is commonly done for the familiar spin-independent and spin-dependent interactions. Then, we analyze the simulations extracting the dark matter-nucleon interaction type from the data directly, in contrast to standard analyses. This second approach requires an extensive exploration of the full 11-dimensional parameter space of the dark matter-nucleon effective theory. Interestingly, we identify 5 scenarios where the dark matter mass and the dark matter-nucleon interaction type can be reconstructed from the data simultaneously. We stress the importance of extracting the dark matter nucleon-interaction type from the data directly, discussing the main challenges found addressing this complex 11-dimensional problem.
|
1702.00800
|
Andrea Ferroglia
|
Alessandro Broggio, Andrea Ferroglia, Giovanni Ossola, Ben D. Pecjak,
and Ray D. Sameshima
|
Associated production of a top pair and a Z boson at the LHC to NNLL
accuracy
|
21 pages, 7 figures. arXiv admin note: text overlap with
arXiv:1611.00049
| null |
10.1007/JHEP04(2017)105
|
TUM-HEP-1075/17, IPPP/17/4
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the resummation of soft gluon emission corrections to the production
of a top-antitop pair in association with a Z boson at the Large Hadron
Collider to next-to-next-to-leading logarithmic accuracy. By means of an
in-house parton level Monte Carlo code we evaluate the resummation formula for
the total cross section and several differential distributions at a
center-of-mass energy of 13 TeV, and we match these calculations to
next-to-leading order results.
|
[
{
"created": "Thu, 2 Feb 2017 19:11:02 GMT",
"version": "v1"
}
] |
2017-05-24
|
[
[
"Broggio",
"Alessandro",
""
],
[
"Ferroglia",
"Andrea",
""
],
[
"Ossola",
"Giovanni",
""
],
[
"Pecjak",
"Ben D.",
""
],
[
"Sameshima",
"Ray D.",
""
]
] |
We study the resummation of soft gluon emission corrections to the production of a top-antitop pair in association with a Z boson at the Large Hadron Collider to next-to-next-to-leading logarithmic accuracy. By means of an in-house parton level Monte Carlo code we evaluate the resummation formula for the total cross section and several differential distributions at a center-of-mass energy of 13 TeV, and we match these calculations to next-to-leading order results.
|
2206.01674
|
Antonio Morais
|
Felipe F. Freitas, Jo\~ao Gon\c{c}alves, Ant\'onio P. Morais, Roman
Pasechnik, Werner Porod
|
On interplay between flavour anomalies and neutrino properties
|
Accepted version
| null | null |
CERN-TH-2022-208
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
A minimal extension of the Standard Model (SM) featuring two scalar
leptoquarks, an SU(2) doublet with hypercharge 1/6 and a singlet with
hypercharge 1/3, is proposed as an economical benchmark model for studies of an
interplay between flavour physics and properties of the neutrino sector. The
presence of such type of leptoquarks radiatively generates neutrino masses and
offers a simultaneous explanation for the current B-physics anomalies involving
$b \to c \ell \nu_\ell$ decays. The model can also accommodate both the muon
magnetic moment and the recently reported $W$ mass anomalies, while complying
with the most stringent lepton flavour violating observables.
|
[
{
"created": "Fri, 3 Jun 2022 16:38:20 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Aug 2022 09:54:35 GMT",
"version": "v2"
},
{
"created": "Mon, 6 Feb 2023 17:12:38 GMT",
"version": "v3"
},
{
"created": "Fri, 10 Nov 2023 12:38:46 GMT",
"version": "v4"
}
] |
2023-11-13
|
[
[
"Freitas",
"Felipe F.",
""
],
[
"Gonçalves",
"João",
""
],
[
"Morais",
"António P.",
""
],
[
"Pasechnik",
"Roman",
""
],
[
"Porod",
"Werner",
""
]
] |
A minimal extension of the Standard Model (SM) featuring two scalar leptoquarks, an SU(2) doublet with hypercharge 1/6 and a singlet with hypercharge 1/3, is proposed as an economical benchmark model for studies of an interplay between flavour physics and properties of the neutrino sector. The presence of such type of leptoquarks radiatively generates neutrino masses and offers a simultaneous explanation for the current B-physics anomalies involving $b \to c \ell \nu_\ell$ decays. The model can also accommodate both the muon magnetic moment and the recently reported $W$ mass anomalies, while complying with the most stringent lepton flavour violating observables.
|
0805.0435
|
Harry Lipkin J
|
Harry J. Lipkin
|
The GSI method for studying neutrino mass differences - For Pedestrians
|
10 pages
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A new experiment studying the behavior of a radioactive ion before its weak
decay by K-capture suggests that neutrino masses and mixing can be investigated
without detecting the neutrino. Every weak decay can be observed, thus avoiding
the suppression by the low neutrino absorption cross section of the signal in
conventional neutrino oscillation experiments. The normally unobservable long
wave lengths are made observable by having the radioactive source move a long
distance circulating around in a storage ring. A new oscillation phenomenon
with nonexponential decay arises in this "watched pot" experiment where
continous monitoring sets the decay clock back to zero while preserving
oscillating phases in the initial state. The initial ion wave packet has a
momentum spread required by Heisenberg and contains pairs of components with
different momenta and energies. These can produce neutrino amplitudes in two
mass eigenstates with different momenta which mix to produce a single $\nu_e$
state. In this typical quantum mechanics "two-slit" or "which path" experiment
a transition between the same initial and final states can go via two paths in
energy-momentum space. Their relative phases change with the propagation of the
initial state between the points of entry and decay. The oscillations produced
by these phase changes are shown to be consistent with quantum mechanics and
causality.
|
[
{
"created": "Sun, 4 May 2008 18:42:51 GMT",
"version": "v1"
},
{
"created": "Sun, 1 Jun 2008 19:02:17 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Jan 2009 14:00:31 GMT",
"version": "v3"
}
] |
2009-01-08
|
[
[
"Lipkin",
"Harry J.",
""
]
] |
A new experiment studying the behavior of a radioactive ion before its weak decay by K-capture suggests that neutrino masses and mixing can be investigated without detecting the neutrino. Every weak decay can be observed, thus avoiding the suppression by the low neutrino absorption cross section of the signal in conventional neutrino oscillation experiments. The normally unobservable long wave lengths are made observable by having the radioactive source move a long distance circulating around in a storage ring. A new oscillation phenomenon with nonexponential decay arises in this "watched pot" experiment where continous monitoring sets the decay clock back to zero while preserving oscillating phases in the initial state. The initial ion wave packet has a momentum spread required by Heisenberg and contains pairs of components with different momenta and energies. These can produce neutrino amplitudes in two mass eigenstates with different momenta which mix to produce a single $\nu_e$ state. In this typical quantum mechanics "two-slit" or "which path" experiment a transition between the same initial and final states can go via two paths in energy-momentum space. Their relative phases change with the propagation of the initial state between the points of entry and decay. The oscillations produced by these phase changes are shown to be consistent with quantum mechanics and causality.
|
hep-ph/9305213
|
Terry Elliott
|
T. Elliott
|
Bounding the Higgs Boson Mass in the Next-to-Minimal Supersymmetric
Standard Model
|
6 pages, LaTex, SHEP 92/93-19. Contribution to SUSY-93 Workshop
Proceedings, Boston, U.S.A., March 1993
| null | null | null |
hep-ph
| null |
We discuss the upper bound on the lightest CP-even Higgs boson mass in the
next-to-minimal supersymmetric standard model within the framework of a low
energy renormalisation group analysis. We find $m_h$ < 146 GeV for $m_t$ = 90
GeV, decreasing to $m_h$ < 123 GeV for $m_t$ = 180 GeV.
|
[
{
"created": "Wed, 5 May 1993 13:32:50 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Elliott",
"T.",
""
]
] |
We discuss the upper bound on the lightest CP-even Higgs boson mass in the next-to-minimal supersymmetric standard model within the framework of a low energy renormalisation group analysis. We find $m_h$ < 146 GeV for $m_t$ = 90 GeV, decreasing to $m_h$ < 123 GeV for $m_t$ = 180 GeV.
|
0803.2632
|
Leonard Gamberg
|
L.P. Gamberg, A. Mukherjee, and P.J. Mulders
|
Spectral analysis of gluonic pole matrix elements for fragmentation
|
9 pages, 4 figures, added references
|
Phys.Rev.D77:114026,2008
|
10.1103/PhysRevD.77.114026
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The non-vanishing of gluonic pole matrix elements can explain the appearance
of single spin asymmetries in high-energy scattering processes. We use a
spectator framework approach to investigate the spectral properties of
quark-quark-gluon correlators and use this to study gluonic pole matrix
elements. Such matrix elements appear in principle both for distribution
functions such as the Sivers function and fragmentation functions such as the
Collins function. We find that for a large class of spectator models, the
contribution of the gluonic pole matrix element in fragmentation functions
vanishes. This outcome is important in the study of universality for
fragmentation functions and confirms findings using a different approach.
|
[
{
"created": "Tue, 18 Mar 2008 18:13:29 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Mar 2008 11:47:57 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Gamberg",
"L. P.",
""
],
[
"Mukherjee",
"A.",
""
],
[
"Mulders",
"P. J.",
""
]
] |
The non-vanishing of gluonic pole matrix elements can explain the appearance of single spin asymmetries in high-energy scattering processes. We use a spectator framework approach to investigate the spectral properties of quark-quark-gluon correlators and use this to study gluonic pole matrix elements. Such matrix elements appear in principle both for distribution functions such as the Sivers function and fragmentation functions such as the Collins function. We find that for a large class of spectator models, the contribution of the gluonic pole matrix element in fragmentation functions vanishes. This outcome is important in the study of universality for fragmentation functions and confirms findings using a different approach.
|
0806.4926
|
Ioannis Tsohantjis
|
I. Tsohantjis, S. Moustaizis, I. Ploumistakis
|
On electron-positron pair production using a two level on resonant
multiphoton approximation
|
10 pages, 5 figures
|
Phys.Lett.B650:249-256,2007
|
10.1016/j.physletb.2007.05.034
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present an indepth investigation of certain aspects of the two level on
resonant multiphoton approximation to pair production from vacuum in the
presence of strong electromagnetic fields. Numerical computations strongly
suggest that a viable experimental verification of this approach using modern
optical laser technology can be achieved. It is shown that use of higher
harmonic within the presently available range of laser intensities can lead to
multiphoton processes offering up to 10^12 pairs per laser shot. Finally the
range of applicability of this approximation is examined from the point of view
of admissible values of electric field strength and energy spectrum of the
created pairs.
|
[
{
"created": "Mon, 30 Jun 2008 15:32:25 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Tsohantjis",
"I.",
""
],
[
"Moustaizis",
"S.",
""
],
[
"Ploumistakis",
"I.",
""
]
] |
We present an indepth investigation of certain aspects of the two level on resonant multiphoton approximation to pair production from vacuum in the presence of strong electromagnetic fields. Numerical computations strongly suggest that a viable experimental verification of this approach using modern optical laser technology can be achieved. It is shown that use of higher harmonic within the presently available range of laser intensities can lead to multiphoton processes offering up to 10^12 pairs per laser shot. Finally the range of applicability of this approximation is examined from the point of view of admissible values of electric field strength and energy spectrum of the created pairs.
|
hep-ph/9711220
|
Yasunori Nomura
|
Yasunori Nomura, K. Tobe, and T. Yanagida
|
A Gauge Mediation Model of Dynamical Supersymmetry Breaking without
Color Instability
|
11 pages, Latex
|
Phys.Lett.B425:107-113,1998
|
10.1016/S0370-2693(98)00189-0
|
UT-797, OHSTPY-HEP-T-97-020
|
hep-ph
| null |
We construct a gauge mediation model of dynamical supersymmetry breaking
(DSB) based on a vector-like gauge theory, in which there is a unique
color-preserving true vacuum. The DSB scale $\Lambda/4\pi$ turns out to be as
high as $\Lambda/4\pi \simeq 10^{8-9} GeV$, since the transmission of the DSB
effects to the standard model sector is completed through much higher loops.
This model is perfectly natural and phenomenologically consistent. We also
stress that the dangerous D-term problem for the messenger U(1)_m is
automatically solved by a charge conjugation symmetry in the vector-like gauge
theory.
|
[
{
"created": "Tue, 4 Nov 1997 05:37:23 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jan 1998 05:41:50 GMT",
"version": "v2"
}
] |
2016-09-06
|
[
[
"Nomura",
"Yasunori",
""
],
[
"Tobe",
"K.",
""
],
[
"Yanagida",
"T.",
""
]
] |
We construct a gauge mediation model of dynamical supersymmetry breaking (DSB) based on a vector-like gauge theory, in which there is a unique color-preserving true vacuum. The DSB scale $\Lambda/4\pi$ turns out to be as high as $\Lambda/4\pi \simeq 10^{8-9} GeV$, since the transmission of the DSB effects to the standard model sector is completed through much higher loops. This model is perfectly natural and phenomenologically consistent. We also stress that the dangerous D-term problem for the messenger U(1)_m is automatically solved by a charge conjugation symmetry in the vector-like gauge theory.
|
hep-ph/9807428
|
Christian Hagmann
|
C. Hagmann, S. Chang, P. Sikivie
|
Axions from string decay
|
6 pages, 8 figures, to be published in the Proc. of the 5th IFT Axion
workshop, Gainesville FL, Mar 13-15 1998, 2 sentences slightly changed
|
Nucl.Phys.Proc.Suppl. 72 (1999) 81-86
|
10.1016/S0920-5632(98)00506-4
|
UCRL-JC-131307
|
hep-ph
| null |
We have studied numerically the evolution and decay of axion strings. These
global defects decay mainly by axion emission and thus contribute to the
cosmological axion density. The relative importance of this source relative to
misalignment production of axions depends on the spectrum. Radiation spectra
for various string loop configurations are presented. They support the
contention that the string decay contribution is of the same order of magnitude
as the contribution from misalignment.
|
[
{
"created": "Mon, 20 Jul 1998 21:06:23 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Aug 1998 22:14:32 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Hagmann",
"C.",
""
],
[
"Chang",
"S.",
""
],
[
"Sikivie",
"P.",
""
]
] |
We have studied numerically the evolution and decay of axion strings. These global defects decay mainly by axion emission and thus contribute to the cosmological axion density. The relative importance of this source relative to misalignment production of axions depends on the spectrum. Radiation spectra for various string loop configurations are presented. They support the contention that the string decay contribution is of the same order of magnitude as the contribution from misalignment.
|
2212.03180
|
Christian Kohlf\"urst
|
Christian Kohlf\"urst
|
Pair Production in Circularly Polarized Waves
|
5 pages
| null | null | null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study electron-positron pair production within two counter-propagating,
circularly polarized electromagnetic fields through the Wigner formalism. We
numerically generate high-resolution momentum maps to perform a detailed
spectroscopic analysis. We identify signatures of polarization and kinematics
of the incident fields in the final positron distribution and, on this basis,
provide an intuitive picture of helicity transfer in multiphoton pair
production.
|
[
{
"created": "Tue, 6 Dec 2022 17:54:48 GMT",
"version": "v1"
}
] |
2022-12-07
|
[
[
"Kohlfürst",
"Christian",
""
]
] |
We study electron-positron pair production within two counter-propagating, circularly polarized electromagnetic fields through the Wigner formalism. We numerically generate high-resolution momentum maps to perform a detailed spectroscopic analysis. We identify signatures of polarization and kinematics of the incident fields in the final positron distribution and, on this basis, provide an intuitive picture of helicity transfer in multiphoton pair production.
|
0811.0271
|
Yudi Santoso
|
Yudi Santoso
|
Gravitino Dark Matter with Sneutrino NLSP in NUHM
|
5 pages, 6 figures, to appear in the proceedings of the
Identification of Dark Matter conference (IDM 2008), Stockholm, Sweden, 18-22
August, 2008
|
PoS idm2008:091,2008
| null |
IPPP/08/79, DCPT/08/158
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The identity of dark matter has not been solved up to this date, a problem
that became the main topic of this conference. There are many theoretical
candidates for dark matter particle, including gravitino from supergravity
models. For gravitino dark matter scenario, the phenomenology depends much on
what the next lightest supersymmetric particle (NLSP) is. We show here that
sneutrino can naturally be the NLSP in the Non-Universal Higgs Masses (NUHM)
model, and that this scenario is still phenomenologically viable.
|
[
{
"created": "Mon, 3 Nov 2008 11:37:00 GMT",
"version": "v1"
}
] |
2010-02-17
|
[
[
"Santoso",
"Yudi",
""
]
] |
The identity of dark matter has not been solved up to this date, a problem that became the main topic of this conference. There are many theoretical candidates for dark matter particle, including gravitino from supergravity models. For gravitino dark matter scenario, the phenomenology depends much on what the next lightest supersymmetric particle (NLSP) is. We show here that sneutrino can naturally be the NLSP in the Non-Universal Higgs Masses (NUHM) model, and that this scenario is still phenomenologically viable.
|
2111.13044
|
Talal Ahmed Chowdhury
|
Talal Ahmed Chowdhury, Shaaban Khalil and Ernest Ma
|
Predestined Dark Matter Varieties in the Simplest Left-Right Model
|
12 pages, 5 figures
| null |
10.1016/j.nuclphysb.2022.115778
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In the simplest left-right extension of the Standard Model of particle
interactions with one scalar bidoublet and one $SU(2)_R$ triplet for seesaw
Majorana neutrino masses, the addition of a variety of fermion and scalar
multiplets automatically makes them stable (predestined) dark matter
candidates. We discuss the interplay of this dark ensemble in relic abundance
and direct searches.
|
[
{
"created": "Thu, 25 Nov 2021 12:03:36 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Dec 2021 05:49:12 GMT",
"version": "v2"
}
] |
2022-04-27
|
[
[
"Chowdhury",
"Talal Ahmed",
""
],
[
"Khalil",
"Shaaban",
""
],
[
"Ma",
"Ernest",
""
]
] |
In the simplest left-right extension of the Standard Model of particle interactions with one scalar bidoublet and one $SU(2)_R$ triplet for seesaw Majorana neutrino masses, the addition of a variety of fermion and scalar multiplets automatically makes them stable (predestined) dark matter candidates. We discuss the interplay of this dark ensemble in relic abundance and direct searches.
|
0804.4147
|
Guido Altarelli
|
G. Altarelli
|
Status of the Standard Model at the LHC Start
|
Plenary Talk at the 5th Italian Workshop on p-p Physics at the LHC.
13 pages, no figures
|
Nuovo Cim.B123:257-269,2008
|
10.1393/ncb/i2008-10519-5
|
RM3-TH/08-8, CERN-PH-TH/2008-084
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I present a concise review of where we stand in particle physics today.
First, I will discuss QCD, then the electroweak sector and finally the
motivations and the avenues for new physics beyond the Standard Model.
|
[
{
"created": "Fri, 25 Apr 2008 16:41:33 GMT",
"version": "v1"
}
] |
2010-11-11
|
[
[
"Altarelli",
"G.",
""
]
] |
I present a concise review of where we stand in particle physics today. First, I will discuss QCD, then the electroweak sector and finally the motivations and the avenues for new physics beyond the Standard Model.
|
hep-ph/0611364
|
Sheung Tsun Tsou
|
H. M. Chan and S. T. Tsou
|
A Model Behind the Standard Model
|
66 pages, added new material on phenomenology, and some new
references
|
Eur.Phys.J.C52:635-663,2007
|
10.1140/epjc/s10052-007-0406-4
| null |
hep-ph hep-th
| null |
In spite of its many successes, the Standard Model makes many empirical
assumptions in the Higgs and fermion sectors for which a deeper theoretical
basis is sought. Starting from the usual gauge symmetry $u(1) \times su(2)
\times su(3)$ plus the 3 assumptions: (A) scalar fields as vielbeins in
internal symmetry space \cite{framevec}, (B) the ``confinement picture'' of
symmetry breaking \cite{tHooft,Banovici}, (C) generations as ``dual'' to colour
\cite{genmixdsm}, we are led to a scheme which offers: (I) a geometrical
significance to scalar fields, (II) a theoretical criterion on what scalar
fields are to be introduced, (III) a partial explanation of why $su(2)$ appears
broken while $su(3)$ confines, (IV) baryon-lepton number (B - L) conservation,
(V) the standard electroweak structure, (VI) a 3-valued generation index for
leptons and quarks, and (VII) a dynamical system with all the essential
features of an earlier phenomenological model \cite{genmixdsm} which gave a
good description of the known mass and mixing patterns of quarks and leptons
including neutrino oscillations. There are other implications the consistency
of which with experiment, however, has not yet been systematically explored. A
possible outcome is a whole new branch of particle spectroscopy from $su(2)$
confinement, potentially as rich in details as that of hadrons from colour
confinement, which will be accessible to experiment at high energy.
|
[
{
"created": "Wed, 29 Nov 2006 09:38:27 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Jul 2007 11:46:21 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Chan",
"H. M.",
""
],
[
"Tsou",
"S. T.",
""
]
] |
In spite of its many successes, the Standard Model makes many empirical assumptions in the Higgs and fermion sectors for which a deeper theoretical basis is sought. Starting from the usual gauge symmetry $u(1) \times su(2) \times su(3)$ plus the 3 assumptions: (A) scalar fields as vielbeins in internal symmetry space \cite{framevec}, (B) the ``confinement picture'' of symmetry breaking \cite{tHooft,Banovici}, (C) generations as ``dual'' to colour \cite{genmixdsm}, we are led to a scheme which offers: (I) a geometrical significance to scalar fields, (II) a theoretical criterion on what scalar fields are to be introduced, (III) a partial explanation of why $su(2)$ appears broken while $su(3)$ confines, (IV) baryon-lepton number (B - L) conservation, (V) the standard electroweak structure, (VI) a 3-valued generation index for leptons and quarks, and (VII) a dynamical system with all the essential features of an earlier phenomenological model \cite{genmixdsm} which gave a good description of the known mass and mixing patterns of quarks and leptons including neutrino oscillations. There are other implications the consistency of which with experiment, however, has not yet been systematically explored. A possible outcome is a whole new branch of particle spectroscopy from $su(2)$ confinement, potentially as rich in details as that of hadrons from colour confinement, which will be accessible to experiment at high energy.
|
hep-ph/9903348
|
Z. J. Xiao
|
Zhenjun Xiao, Chongsheng Li and Kuangta Chao
|
The rare K-decays and $Z^0$-penguin contributions in the
Topcolor-assisted technicolor models
|
Latex file, 27 pages and 10 ps and eps figures, to be published in
Eur.Phys. J. C
|
Eur.Phys.J.C10:51-62,1999
|
10.1007/s100529900048
| null |
hep-ph
| null |
We calculate the new contributions to the rare decays $K^+ \to \pi^+ \nu \bar
\nu$, $K_L \to \pi^0 \nu \bar \nu$ and $K_L \to \mu^+ \mu^-$ from new
$Z^0$-penguin and box diagrams induced by the unit-charged scalars
$(\tilde{\pi}^\pm, \tilde{H}^\pm, \pi_1^\pm, \pi_8^\pm)$ appeared in the
Topcolor-assisted technicolor (TC2) models. We find that: (a) the unit-charged
top-pion $\tilde{\pi}^\pm$ and b-pion $\tilde{H}^\pm$ can provide large
contributions to the rare K-decays if they are relatively light; (b) the size
of mixing elements $D_{L,R}^{ij}$ ($i \neq j$) is strongly constrained by the
data of $B^0$ meson mixing: $|a_R^{ts}|, |a_R^{td}| < 0.01$ for
$a_L^{td}=a_L^{ts}=1/2$ and $m_{\tilde{H}^0}\leq 600GeV$; (c) the enhancements
to the branching ratios of rare K-decays from new scalars can be as large as
one order of magnitude; (d) there is a strong cancellation between the short-
and long-distance dispersive part of the decay $K_L \to \mu^+ \mu^-$, the
constraint on the new short-distance part from this decay mode is thus not
strong; (e) the typical TC2 model under study is generally consistent with the
available rare K-decay data.
|
[
{
"created": "Mon, 15 Mar 1999 02:07:54 GMT",
"version": "v1"
}
] |
2011-09-13
|
[
[
"Xiao",
"Zhenjun",
""
],
[
"Li",
"Chongsheng",
""
],
[
"Chao",
"Kuangta",
""
]
] |
We calculate the new contributions to the rare decays $K^+ \to \pi^+ \nu \bar \nu$, $K_L \to \pi^0 \nu \bar \nu$ and $K_L \to \mu^+ \mu^-$ from new $Z^0$-penguin and box diagrams induced by the unit-charged scalars $(\tilde{\pi}^\pm, \tilde{H}^\pm, \pi_1^\pm, \pi_8^\pm)$ appeared in the Topcolor-assisted technicolor (TC2) models. We find that: (a) the unit-charged top-pion $\tilde{\pi}^\pm$ and b-pion $\tilde{H}^\pm$ can provide large contributions to the rare K-decays if they are relatively light; (b) the size of mixing elements $D_{L,R}^{ij}$ ($i \neq j$) is strongly constrained by the data of $B^0$ meson mixing: $|a_R^{ts}|, |a_R^{td}| < 0.01$ for $a_L^{td}=a_L^{ts}=1/2$ and $m_{\tilde{H}^0}\leq 600GeV$; (c) the enhancements to the branching ratios of rare K-decays from new scalars can be as large as one order of magnitude; (d) there is a strong cancellation between the short- and long-distance dispersive part of the decay $K_L \to \mu^+ \mu^-$, the constraint on the new short-distance part from this decay mode is thus not strong; (e) the typical TC2 model under study is generally consistent with the available rare K-decay data.
|
2208.14002
|
Jason Kumar
|
Kenny Kiriu, Jason Kumar, Jack Runburg
|
The Velocity-Dependent $J$-factor of the Milky Way Halo: Does What
Happens in the Galactic Bulge Stay in the Galactic Bulge?
|
17 pages, 3 figures, LaTeX, updated to match journal version
| null |
10.1088/1475-7516/2022/11/030
| null |
hep-ph astro-ph.GA astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the angular distribution of the photon signal which could arise
from velocity-dependent dark matter annihilation within the Galactic bulge. We
find that, for the case of Sommerfeld-enhanced annihilation, dark matter
annihilation within the bulge is dominated by slow speed particles which never
leave the bulge, allowing one to find a simple analytic relationship between
the dark matter profile within the Galactic bulge and the angular distribution.
On the other hand, for the case $p$- or $d$-wave annihilation, we find that the
small fraction of high-speed particles which can leave the bulge provide a
significant, often dominant, contribution to dark matter annihilation within
the bulge. For these scenarios, fully understanding dark matter annihilation
deep within the Galactic bulge, and the angular distribution of the resulting
photon signal, requires an understanding of the dark matter profile well
outside the bulge. We consider the Galactic Center excess in light of these
results, and find that an explanation of this excess in terms of $p$-wave
annihilation would require the dark matter profile within the bulge to have a
much steeper profile than usually considered, but with uncertainties related to
the behavior of the profile outside the bulge.
|
[
{
"created": "Tue, 30 Aug 2022 05:57:38 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Nov 2022 18:22:09 GMT",
"version": "v2"
}
] |
2022-11-23
|
[
[
"Kiriu",
"Kenny",
""
],
[
"Kumar",
"Jason",
""
],
[
"Runburg",
"Jack",
""
]
] |
We consider the angular distribution of the photon signal which could arise from velocity-dependent dark matter annihilation within the Galactic bulge. We find that, for the case of Sommerfeld-enhanced annihilation, dark matter annihilation within the bulge is dominated by slow speed particles which never leave the bulge, allowing one to find a simple analytic relationship between the dark matter profile within the Galactic bulge and the angular distribution. On the other hand, for the case $p$- or $d$-wave annihilation, we find that the small fraction of high-speed particles which can leave the bulge provide a significant, often dominant, contribution to dark matter annihilation within the bulge. For these scenarios, fully understanding dark matter annihilation deep within the Galactic bulge, and the angular distribution of the resulting photon signal, requires an understanding of the dark matter profile well outside the bulge. We consider the Galactic Center excess in light of these results, and find that an explanation of this excess in terms of $p$-wave annihilation would require the dark matter profile within the bulge to have a much steeper profile than usually considered, but with uncertainties related to the behavior of the profile outside the bulge.
|
hep-ph/0302219
|
Naveen Gaur
|
Deepak Chandra and Ashok Goyal (University of Delhi)
|
Effects of curvature and interactions on the dynamics of the
deconfinement phase transition
|
LaTeX, 17 pages including 14 postscript figures
|
Int.J.Mod.Phys. A19 (2004) 5221-5236
|
10.1142/S0217751X04020701
| null |
hep-ph
| null |
We study the dynamics of first-order cofinement-deconfinement phase
transition through nucleation of hadronic bubbles in an expanding quark gluon
plasma in the context of heavy ion collisions for interacting quark and hadron
gas and by incorporating the effects of curvature energy. We find that the
interactions reduce the delay in the phase transition whereas the curvature
energy has a mixed behavior. In contrast to the case of early Universe phase
transition, here lower values of surface tension increase the supercooling and
slow down the hadronization process. Higher values of bag pressure tend to
speed up the transition. Another interesting feature is the start of the
hadronization process as soon as the QGP is created.
|
[
{
"created": "Tue, 25 Feb 2003 05:14:10 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Chandra",
"Deepak",
"",
"University of Delhi"
],
[
"Goyal",
"Ashok",
"",
"University of Delhi"
]
] |
We study the dynamics of first-order cofinement-deconfinement phase transition through nucleation of hadronic bubbles in an expanding quark gluon plasma in the context of heavy ion collisions for interacting quark and hadron gas and by incorporating the effects of curvature energy. We find that the interactions reduce the delay in the phase transition whereas the curvature energy has a mixed behavior. In contrast to the case of early Universe phase transition, here lower values of surface tension increase the supercooling and slow down the hadronization process. Higher values of bag pressure tend to speed up the transition. Another interesting feature is the start of the hadronization process as soon as the QGP is created.
|
hep-ph/9706235
| null |
Markus A. Luty
|
Naive Dimensional Analysis and Supersymmetry
|
17 pages, LaTeX2e, 1 eps figure
|
Phys. Rev. D 57, 1531 (1998)
|
10.1103/PhysRevD.57.1531
|
UMD-PP-115
|
hep-ph
| null |
In strongly-coupled theories with no small parameters, there are factors of
4\pi that appear when the couplings of the low-energy effective lagrangian are
written in units of the effective cutoff \Lambda. These numerical factors can
be explained using "naive dimensional analysis." We extend these ideas to
supersymmetric theories, and show how to systematically include small
parameters and couplings to weakly-interacting fields. The basic principle is
that if the fundamental theory is strongly coupled, then the effective theory
must also be strongly coupled at the scale \Lambda. We use our results to
analyze several examples where strong supersymmetric dynamics may be relevant
for phenomenology. For models that break supersymmetry through strong dynamics
with no small parameters, we show that the Goldstino decay constant F is of
order \La^{2} / (4\pi). We also consider theories with standard-model gauge
bosons coupled directly to strong supersymmetry-breaking dynamics near the weak
scale; smoothly-confining theories; and a model that breaks supersymmetry
through the mechanism of a deformed moduli space.
|
[
{
"created": "Tue, 3 Jun 1997 19:32:28 GMT",
"version": "v1"
}
] |
2016-08-25
|
[
[
"Luty",
"Markus A.",
""
]
] |
In strongly-coupled theories with no small parameters, there are factors of 4\pi that appear when the couplings of the low-energy effective lagrangian are written in units of the effective cutoff \Lambda. These numerical factors can be explained using "naive dimensional analysis." We extend these ideas to supersymmetric theories, and show how to systematically include small parameters and couplings to weakly-interacting fields. The basic principle is that if the fundamental theory is strongly coupled, then the effective theory must also be strongly coupled at the scale \Lambda. We use our results to analyze several examples where strong supersymmetric dynamics may be relevant for phenomenology. For models that break supersymmetry through strong dynamics with no small parameters, we show that the Goldstino decay constant F is of order \La^{2} / (4\pi). We also consider theories with standard-model gauge bosons coupled directly to strong supersymmetry-breaking dynamics near the weak scale; smoothly-confining theories; and a model that breaks supersymmetry through the mechanism of a deformed moduli space.
|
0909.2305
|
Qing-Hong Cao
|
Qing-Hong Cao, Chuan-Ren Chen, Carl Schmidt, Zhao Li, C.-P. Yuan
|
Improved Predictions for Higgs Q_T at the Tevatron and the LHC
|
revised version, discussion of scale dependences added
| null | null |
ANL-HEP-PR-09-20, EFI-09-14, IPMU09-0038, MSUHEP-090911
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The search for the Higgs boson at the Tevatron and the LHC relies on detailed
calculations of the kinematics of Higgs boson production and decay. In this
paper, we improve the calculation of the distribution in transverse momentum,
$Q_T$, of the Higgs boson in the gluon fusion production process, $gg\to H$, by
matching the resummed distribution at small $Q_T$ with the ${\cal
O}(\alpha_{s}^4)$ fixed-order perturbative calculation at high $Q_T$ in the
ResBos Monte Carlo program. The distribution is higher at large $Q_T$ than with
the old ${\cal O}(\alpha_{s}^3)$ fixed-order perturbative calculation, and the
matching with the resummed calculation is much smoother. The total cross
section is also increased, more in line with next-to-next-to-leading-order
calculations. We also study the effect of the new calculation on the
distribution of $\Delta\phi_{\ell\ell}$ in the overall process $gg\to H\to
W^{+} W^{-}\to\ell^{+}\ell^{-}\nu\bar{\nu}$, and the effect of PDF
uncertainties on the distributions at the Tevatron and the LHC.
|
[
{
"created": "Sat, 12 Sep 2009 05:05:59 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Mar 2011 15:30:42 GMT",
"version": "v2"
}
] |
2011-03-24
|
[
[
"Cao",
"Qing-Hong",
""
],
[
"Chen",
"Chuan-Ren",
""
],
[
"Schmidt",
"Carl",
""
],
[
"Li",
"Zhao",
""
],
[
"Yuan",
"C. -P.",
""
]
] |
The search for the Higgs boson at the Tevatron and the LHC relies on detailed calculations of the kinematics of Higgs boson production and decay. In this paper, we improve the calculation of the distribution in transverse momentum, $Q_T$, of the Higgs boson in the gluon fusion production process, $gg\to H$, by matching the resummed distribution at small $Q_T$ with the ${\cal O}(\alpha_{s}^4)$ fixed-order perturbative calculation at high $Q_T$ in the ResBos Monte Carlo program. The distribution is higher at large $Q_T$ than with the old ${\cal O}(\alpha_{s}^3)$ fixed-order perturbative calculation, and the matching with the resummed calculation is much smoother. The total cross section is also increased, more in line with next-to-next-to-leading-order calculations. We also study the effect of the new calculation on the distribution of $\Delta\phi_{\ell\ell}$ in the overall process $gg\to H\to W^{+} W^{-}\to\ell^{+}\ell^{-}\nu\bar{\nu}$, and the effect of PDF uncertainties on the distributions at the Tevatron and the LHC.
|
1910.01649
|
James Alvey
|
Nashwan Sabti, James Alvey, Miguel Escudero, Malcolm Fairbairn, Diego
Blas
|
Refined Bounds on MeV-scale Thermal Dark Sectors from BBN and the CMB
|
28 pages, 10 figures, 7 tables. v2. References and minor
clarifications added. Matches published version in JCAP
| null |
10.1088/1475-7516/2020/01/004
|
KCL-2019-75
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
New light states thermally coupled to the Standard Model plasma alter the
expansion history of the Universe and impact the synthesis of the primordial
light elements. In this work, we carry out an exhaustive and precise analysis
of the implications of MeV-scale BSM particles in Big Bang Nucleosynthesis
(BBN) and for Cosmic Microwave Background (CMB) observations. We find that, BBN
observations set a lower bound on the thermal dark matter mass of $m_\chi >
0.4\,\text{MeV}$ at $2\sigma$. This bound is independent of the spin and number
of internal degrees of freedom of the particle, of the annihilation being
s-wave or p-wave, and of the annihilation final state. Furthermore, we show
that current BBN plus CMB observations constrain purely electrophilic and
neutrinophilic BSM species to have a mass, $m_\chi > 3.7\,\text{MeV}$ at
$2\sigma$. We explore the reach of future BBN measurements and show that
upcoming CMB missions should improve the bounds on light BSM thermal states to
$m_\chi > (10-15)\,\text{MeV}$. Finally, we demonstrate that very light BSM
species thermally coupled to the SM plasma are highly disfavoured by current
cosmological observations.
|
[
{
"created": "Thu, 3 Oct 2019 18:00:01 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Nov 2019 16:31:31 GMT",
"version": "v2"
}
] |
2020-01-15
|
[
[
"Sabti",
"Nashwan",
""
],
[
"Alvey",
"James",
""
],
[
"Escudero",
"Miguel",
""
],
[
"Fairbairn",
"Malcolm",
""
],
[
"Blas",
"Diego",
""
]
] |
New light states thermally coupled to the Standard Model plasma alter the expansion history of the Universe and impact the synthesis of the primordial light elements. In this work, we carry out an exhaustive and precise analysis of the implications of MeV-scale BSM particles in Big Bang Nucleosynthesis (BBN) and for Cosmic Microwave Background (CMB) observations. We find that, BBN observations set a lower bound on the thermal dark matter mass of $m_\chi > 0.4\,\text{MeV}$ at $2\sigma$. This bound is independent of the spin and number of internal degrees of freedom of the particle, of the annihilation being s-wave or p-wave, and of the annihilation final state. Furthermore, we show that current BBN plus CMB observations constrain purely electrophilic and neutrinophilic BSM species to have a mass, $m_\chi > 3.7\,\text{MeV}$ at $2\sigma$. We explore the reach of future BBN measurements and show that upcoming CMB missions should improve the bounds on light BSM thermal states to $m_\chi > (10-15)\,\text{MeV}$. Finally, we demonstrate that very light BSM species thermally coupled to the SM plasma are highly disfavoured by current cosmological observations.
|
1611.05120
|
Yu Seon Jeong
|
Yu Seon Jeong, Atri Bhattacharya, Rikard Enberg, C. S. Kim, Mary Hall
Reno, Ina Sarcevic and Anna Stasto
|
Prompt atmospheric neutrino flux
|
5 pages, 3 figures, contribution to the proceedings of ICHEP2016
| null | null | null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We evaluate the prompt atmospheric neutrino flux including nuclear correction
and $B$ hadron contribution in the different frameworks: NLO perturbative QCD
and dipole models. The nuclear effect is larger in the prompt neutrino flux
than in the total charm production cross section, and it reduces the fluxes by
$10\% - 30\%$ depending on the model. We also investigate the uncertainty using
the QCD scales allowed by the charm cross section data from RHIC and LHC
experiments.
|
[
{
"created": "Wed, 16 Nov 2016 02:18:46 GMT",
"version": "v1"
}
] |
2016-11-17
|
[
[
"Jeong",
"Yu Seon",
""
],
[
"Bhattacharya",
"Atri",
""
],
[
"Enberg",
"Rikard",
""
],
[
"Kim",
"C. S.",
""
],
[
"Reno",
"Mary Hall",
""
],
[
"Sarcevic",
"Ina",
""
],
[
"Stasto",
"Anna",
""
]
] |
We evaluate the prompt atmospheric neutrino flux including nuclear correction and $B$ hadron contribution in the different frameworks: NLO perturbative QCD and dipole models. The nuclear effect is larger in the prompt neutrino flux than in the total charm production cross section, and it reduces the fluxes by $10\% - 30\%$ depending on the model. We also investigate the uncertainty using the QCD scales allowed by the charm cross section data from RHIC and LHC experiments.
|
1611.08533
|
Jorge Segovia
|
F. Fern\'andez, D. R. Entem, P. G. Ortega, J. Segovia
|
From $J/\psi$ to LHCb pentaquark
|
Contribution to the proceedings of the 23rd European Conference on
Few-Body Problems in Physics (EFB23). August 8-12, 2016. Aarhus, Denmark
| null | null | null |
hep-ph hep-ex hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The original charmonium two-body problem, like the $c\bar c$ structure of the
$J/\psi$ meson, has become more involved in the last few years with the
discovery of new resonances such as the tentative molecular state $X(3872)$ or
the possible pentaquark one $P_{c}(4380)^{+}$. We discuss herein how these
exotic states (and others) can be described in a unified way adding higher Fock
state components to the naive quark model picture. In particular, we present
our theoretical results on the pentaquark states $P_{c}(4380)^{+}$ and
$P_{c}(4450)^{+}$, and on the new charmonium-like resonances $X(4140)$,
$X(4274)$, $X(4500)$ and $X(4700)$ that have been reported in $2016$ by the
LHCb Collaboration.
|
[
{
"created": "Fri, 25 Nov 2016 17:49:45 GMT",
"version": "v1"
}
] |
2016-11-28
|
[
[
"Fernández",
"F.",
""
],
[
"Entem",
"D. R.",
""
],
[
"Ortega",
"P. G.",
""
],
[
"Segovia",
"J.",
""
]
] |
The original charmonium two-body problem, like the $c\bar c$ structure of the $J/\psi$ meson, has become more involved in the last few years with the discovery of new resonances such as the tentative molecular state $X(3872)$ or the possible pentaquark one $P_{c}(4380)^{+}$. We discuss herein how these exotic states (and others) can be described in a unified way adding higher Fock state components to the naive quark model picture. In particular, we present our theoretical results on the pentaquark states $P_{c}(4380)^{+}$ and $P_{c}(4450)^{+}$, and on the new charmonium-like resonances $X(4140)$, $X(4274)$, $X(4500)$ and $X(4700)$ that have been reported in $2016$ by the LHCb Collaboration.
|
hep-ph/0404080
|
Masayasu Harada
|
Masayasu Harada (Nagoya Univ.)
|
Vector Manifestation in Hot Matter : Formulation and Predictions
|
2 pages, Talk given at the YITP workshop on ``Nuclear Matter under
Extreme Conditions" (Matter03), Dec. 1-3, 2003, Kyoto, Japan
|
Prog.Theor.Phys.Suppl. 156 (2004) 172-173
|
10.1143/PTPS.156.172
|
DPNU-04-07
|
hep-ph
| null |
In this write-up, I list the key ingredients for formulating the vector
manifestation in hot matter together with several predictions made so far.
|
[
{
"created": "Thu, 8 Apr 2004 13:32:17 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Harada",
"Masayasu",
"",
"Nagoya Univ."
]
] |
In this write-up, I list the key ingredients for formulating the vector manifestation in hot matter together with several predictions made so far.
|
2112.14542
|
Brenda Malabarba
|
Brenda B. Malabarba, A. Mart\'inez Torres, K.P. Khemchandani, Xiu-Lei
Ren and Li-Sheng Geng
|
Kaon and Nucleon States with Hidden Charm
|
Proceedings HADRON 2021
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this talk we discuss the formation of exotic hadrons with hidden charm
arising from three-body interactions. To be more specific, in the strangeness
sector, we predict the existence of a mesonic state, $K^*(4307)$, which is
dynamically generated from the three-body interactions of the $KD\bar{D}^*$
system, has mass around $4307$ MeV and quantum numbers $I(J^P) = 1/2\,(1^-)$.
In the baryonic sector, we predict the existence of $N^*$ states, which are
generated from the three-body interactions of the $ND\bar{D}^*$ system, with
masses around $4400\sim 4600$ MeV, widths of $2\sim 20$ MeV and positive
parity.
|
[
{
"created": "Wed, 29 Dec 2021 13:37:04 GMT",
"version": "v1"
}
] |
2021-12-30
|
[
[
"Malabarba",
"Brenda B.",
""
],
[
"Torres",
"A. Martínez",
""
],
[
"Khemchandani",
"K. P.",
""
],
[
"Ren",
"Xiu-Lei",
""
],
[
"Geng",
"Li-Sheng",
""
]
] |
In this talk we discuss the formation of exotic hadrons with hidden charm arising from three-body interactions. To be more specific, in the strangeness sector, we predict the existence of a mesonic state, $K^*(4307)$, which is dynamically generated from the three-body interactions of the $KD\bar{D}^*$ system, has mass around $4307$ MeV and quantum numbers $I(J^P) = 1/2\,(1^-)$. In the baryonic sector, we predict the existence of $N^*$ states, which are generated from the three-body interactions of the $ND\bar{D}^*$ system, with masses around $4400\sim 4600$ MeV, widths of $2\sim 20$ MeV and positive parity.
|
1803.03091
|
Nadav Joseph Outmezguine
|
Rennan Barkana, Nadav Joseph Outmezguine, Diego Redigolo and Tomer
Volansky
|
Signs of Dark Matter at 21-cm?
|
Constraints updated, typos corrected. Conclusions unchanged
|
Phys. Rev. D 98, 103005 (2018)
|
10.1103/PhysRevD.98.103005
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently the EDGES collaboration reported an anomalous absorption signal in
the sky-averaged 21-cm spectrum around $z=17$. Such a signal may be understood
as an indication for an unexpected cooling of the hydrogen gas during or prior
to the so called Cosmic Dawn era. Here we explore the possibility that dark
matter cooled the gas through velocity-dependent, Rutherford-like interactions.
We argue that such interactions require a light mediator that is highly
constrained by 5th force experiments and limits from stellar cooling.
Consequently, only a hidden or the visible photon can in principle mediate such
a force. Neutral hydrogen thus plays a sub-leading role and the cooling occurs
via the residual free electrons and protons. We find that these two scenarios
are strongly constrained by the predicted dark matter self-interactions and by
limits on millicharged dark matter respectively. We conclude that the 21-cm
absorption line is unlikely to be the result of gas cooling via the scattering
with a dominant component of the dark matter. An order 1\% subcomponent of
millicharged dark matter remains a viable explanation.
|
[
{
"created": "Thu, 8 Mar 2018 14:06:29 GMT",
"version": "v1"
},
{
"created": "Thu, 31 May 2018 19:55:19 GMT",
"version": "v2"
}
] |
2018-11-14
|
[
[
"Barkana",
"Rennan",
""
],
[
"Outmezguine",
"Nadav Joseph",
""
],
[
"Redigolo",
"Diego",
""
],
[
"Volansky",
"Tomer",
""
]
] |
Recently the EDGES collaboration reported an anomalous absorption signal in the sky-averaged 21-cm spectrum around $z=17$. Such a signal may be understood as an indication for an unexpected cooling of the hydrogen gas during or prior to the so called Cosmic Dawn era. Here we explore the possibility that dark matter cooled the gas through velocity-dependent, Rutherford-like interactions. We argue that such interactions require a light mediator that is highly constrained by 5th force experiments and limits from stellar cooling. Consequently, only a hidden or the visible photon can in principle mediate such a force. Neutral hydrogen thus plays a sub-leading role and the cooling occurs via the residual free electrons and protons. We find that these two scenarios are strongly constrained by the predicted dark matter self-interactions and by limits on millicharged dark matter respectively. We conclude that the 21-cm absorption line is unlikely to be the result of gas cooling via the scattering with a dominant component of the dark matter. An order 1\% subcomponent of millicharged dark matter remains a viable explanation.
|
2107.02514
|
Oleg Selyugin
|
O.V. Selyugin
|
GPDs of hadrons and elastic pion-nucleon scattering
|
13 pages, 20 figures, typos corrected, minor clarification added
|
Phys. Rev. D 104, 034001 (2021)
|
10.1103/PhysRevD.104.034001
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
The pion structure is represented by Generelazed parton distribution
functions (GPDs). The momentum transfer dependence of GPDs of the pion was
obtained on the basis of the form of GPDs of the nucleon in the framework of
the high energy generalized structure (HEGS) model. To this end, different
forms of PDFs of the pion of various Collaborations were examined with taking
into account the available experimental data on the pion form factors. As a
result, the electromagnetic and gravitomagnetic form factors of the pion were
calculated. They were used in the framework of the HEGS model with the
electromagnetic and gravitomagnetic form factors of the proton for describing
pion-nucleon elastic scattering in a wide energy and momentum transfer region
with a minimum of fitting parameters. The properties of the obtained scattering
amplitude were analyzed.
|
[
{
"created": "Tue, 6 Jul 2021 10:17:39 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Aug 2021 15:43:41 GMT",
"version": "v2"
}
] |
2021-08-11
|
[
[
"Selyugin",
"O. V.",
""
]
] |
The pion structure is represented by Generelazed parton distribution functions (GPDs). The momentum transfer dependence of GPDs of the pion was obtained on the basis of the form of GPDs of the nucleon in the framework of the high energy generalized structure (HEGS) model. To this end, different forms of PDFs of the pion of various Collaborations were examined with taking into account the available experimental data on the pion form factors. As a result, the electromagnetic and gravitomagnetic form factors of the pion were calculated. They were used in the framework of the HEGS model with the electromagnetic and gravitomagnetic form factors of the proton for describing pion-nucleon elastic scattering in a wide energy and momentum transfer region with a minimum of fitting parameters. The properties of the obtained scattering amplitude were analyzed.
|
2302.05461
|
Tran Quang Thong Nguyen
|
Kingman Cheung, Thong T. Q. Nguyen, C. J. Ouseph
|
Leptoquark search at the Forward Physics Facility
|
21 pages, 10 figures. Adding two subfigures on the TeV mass LQ mass
regime
|
Phys. Rev. D 108 (2023) 3, 036014
|
10.1103/PhysRevD.108.036014
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this study, we calculate the sensitivity reach on the vector leptoquark
(LQ) $U_1$ at the experiments proposed in Forward Physics Facility (FPF),
including FASER$\nu$, FASER$\nu2$, FLArE (10 tons), and FLArE (100 tons) using
the neutrino-nucleon scattering ($\nu N \rightarrow \nu N'$ and $\nu N
\rightarrow l N'$). We cover a wide mass range of $10^{-3}$ GeV $\leq
M_{LQ}\leq 10^4$ GeV. The new result shows that the FLArE (100 tons) offers the
best sensitivity to the LQ model. The sensitivity curves for all the
experiments follow a similar pattern with weakened sensitivities with the
increment of the LQ mass. We combine the sensitivities obtained from the
neutral- and charged-current interactions of the neutrinos.
|
[
{
"created": "Fri, 10 Feb 2023 19:00:03 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Aug 2023 09:32:01 GMT",
"version": "v2"
}
] |
2023-08-16
|
[
[
"Cheung",
"Kingman",
""
],
[
"Nguyen",
"Thong T. Q.",
""
],
[
"Ouseph",
"C. J.",
""
]
] |
In this study, we calculate the sensitivity reach on the vector leptoquark (LQ) $U_1$ at the experiments proposed in Forward Physics Facility (FPF), including FASER$\nu$, FASER$\nu2$, FLArE (10 tons), and FLArE (100 tons) using the neutrino-nucleon scattering ($\nu N \rightarrow \nu N'$ and $\nu N \rightarrow l N'$). We cover a wide mass range of $10^{-3}$ GeV $\leq M_{LQ}\leq 10^4$ GeV. The new result shows that the FLArE (100 tons) offers the best sensitivity to the LQ model. The sensitivity curves for all the experiments follow a similar pattern with weakened sensitivities with the increment of the LQ mass. We combine the sensitivities obtained from the neutral- and charged-current interactions of the neutrinos.
|
hep-ph/9910454
|
Gabriel Sanchez-Colon
|
A. Garcia (1), R. Huerta (2), and G. Sanchez-Colon (2) ((1)
CINVESTAV-IPN, (2) CINVESTAV-IPN. Unidad Merida)
|
A priori mixing of mesons and the |Delta I|=1/2 rule in K\to\pi\pi
| null |
Mod.Phys.Lett. A15 (2000) 1749-1754
|
10.1142/S021773230000205X
| null |
hep-ph
| null |
We consider the hypothesis of a priori mixings in the mass eigenstates of
mesons to obtain the |Delta I|=1/2 rule in K\to\pi\pi. The Hamiltonian
responsible for the transition is the strong interacting one. The experimental
data are described using the isospin symmetry relations between the strong
coupling constants.
|
[
{
"created": "Fri, 22 Oct 1999 21:52:20 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Garcia",
"A.",
""
],
[
"Huerta",
"R.",
""
],
[
"Sanchez-Colon",
"G.",
""
]
] |
We consider the hypothesis of a priori mixings in the mass eigenstates of mesons to obtain the |Delta I|=1/2 rule in K\to\pi\pi. The Hamiltonian responsible for the transition is the strong interacting one. The experimental data are described using the isospin symmetry relations between the strong coupling constants.
|
2309.01726
|
Lillian de Bruin
|
Lillian de Bruin, S\"oren Schlichting
|
Sphaleron damping and effects on vector and axial charge transport in
high-temperature QCD plasmas
|
19 pages, 9 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We modify the anomalous hydrodynamic equations of motion to account for
dissipative effects due to QCD sphaleron transitions. By investigating the
linearized hydrodynamic equations, we show that sphaleron transitions lead to
nontrivial effects on vector and axial charge transport phenomena in the
presence of a magnetic field. Due to the dissipative effects of sphaleron
transitions, a wavenumber threshold $k_{\rm CMW}$ emerges characterizing the
onset of chiral magnetic waves. Sphaleron damping also significantly impacts
the time evolution of both axial and vector charge perturbations in a QCD
plasma in the presence of a magnetic field. Based on our analysis of the
linearized hydrodynamic equations, we also investigate the dependence of the
vector charge separation on the sphaleron transition rate, which may have
implications for the experimental search for the Chiral Magnetic Effect in
Heavy Ion Collisions.
|
[
{
"created": "Mon, 4 Sep 2023 17:18:18 GMT",
"version": "v1"
}
] |
2023-09-06
|
[
[
"de Bruin",
"Lillian",
""
],
[
"Schlichting",
"Sören",
""
]
] |
We modify the anomalous hydrodynamic equations of motion to account for dissipative effects due to QCD sphaleron transitions. By investigating the linearized hydrodynamic equations, we show that sphaleron transitions lead to nontrivial effects on vector and axial charge transport phenomena in the presence of a magnetic field. Due to the dissipative effects of sphaleron transitions, a wavenumber threshold $k_{\rm CMW}$ emerges characterizing the onset of chiral magnetic waves. Sphaleron damping also significantly impacts the time evolution of both axial and vector charge perturbations in a QCD plasma in the presence of a magnetic field. Based on our analysis of the linearized hydrodynamic equations, we also investigate the dependence of the vector charge separation on the sphaleron transition rate, which may have implications for the experimental search for the Chiral Magnetic Effect in Heavy Ion Collisions.
|
2001.07207
|
Luca Silvestrini
|
Alexander L. Kagan and Luca Silvestrini
|
Dispersive and Absorptive CP Violation in $D^0- \overline{D^0}$ Mixing
|
28 pages, 3 figures. v2: Modified the discussion of SM estimates for
$\phi_2^M$, $\phi_2^\Gamma$ in Section IVB, cf. Eqs 110-118, includes a new
upper bound on $\phi_2^\Gamma$; typos corrected in Eqs. 73, 77, 151, 152;
added Eqs 155, 156, modified Eq A6, writing clarified in a few places. v3:
version to appear in Phys Rev D. Intro shortened, improved Sec. III.B.3,
typos in the Appendix corrected
|
Phys. Rev. D 103, 053008 (2021)
|
10.1103/PhysRevD.103.053008
|
CERN-TH-2020-011
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
CP violation (CPV) in $D^0-\overline{D^0}$ mixing is described in terms of
the dispersive and absorptive `weak phases' $\phi_f^M$ and $\phi_f^\Gamma$.
They parametrize CPV originating from the interference of $D^0$ decays with and
without dispersive mixing, and with and without absorptive mixing,
respectively, for CP conjugate hadronic final states $f$, $\bar f$. These are
distinct and separately measurable effects. For CP eigenstate final states,
indirect CPV only depends on $\phi_f^M$ (dispersive CPV), whereas
$\phi_f^\Gamma$ (absorptive CPV) can only be probed with non-CP eigenstate
final states. Measurements of the final state dependent phases $\phi_f^M$,
$\phi_f^\Gamma$ determine the intrinsic dispersive and absorptive mixing phases
$\phi_2^M$ and $\phi_2^\Gamma$. The latter are the arguments of the dispersive
and absorptive mixing amplitudes $M_{12}$ and $\Gamma_{12}$, relative to their
dominant ($\Delta U=2$) $U$-spin components. The intrinsic phases are
experimentally accessible due to approximate universality: in the SM, and in
extensions with negligible new CPV phases in Cabibbo favored/doubly Cabibbo
suppressed (CF/DCS) decays, the deviation of $\phi_f^{M,\Gamma}$ from
$\phi_2^{M,\Gamma}$ is negligible in CF/DCS decays $D^0 \to K^\pm X$, and below
$10\% $ in CF/DCS decays $D^0 \to K_{S,L} X$ (up to precisely known
$O(\epsilon_K)$ corrections). In Singly Cabibbo Suppressed (SCS) decays, QCD
pollution enters at $O(\epsilon)$ in $U$-spin breaking and can be significant,
but is $O(\epsilon^2)$ in the average over $f=K^+K^-$, $\pi^+\pi^-$. SM
estimates yield $\phi_2^M, \phi_2^\Gamma = O(0.2\%)$. A fit to current data
allows $O(10)$ larger phases at $2\sigma$, from new physics. A fit based on
naively extrapolated experimental precision suggests that sensitivity to
$\phi_2^{M}$ and $\phi_2^{\Gamma}$ in the SM may be achieved at the LHCb Phase
II upgrade.
|
[
{
"created": "Mon, 20 Jan 2020 18:49:39 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Oct 2020 12:48:19 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Feb 2021 15:35:13 GMT",
"version": "v3"
}
] |
2021-03-31
|
[
[
"Kagan",
"Alexander L.",
""
],
[
"Silvestrini",
"Luca",
""
]
] |
CP violation (CPV) in $D^0-\overline{D^0}$ mixing is described in terms of the dispersive and absorptive `weak phases' $\phi_f^M$ and $\phi_f^\Gamma$. They parametrize CPV originating from the interference of $D^0$ decays with and without dispersive mixing, and with and without absorptive mixing, respectively, for CP conjugate hadronic final states $f$, $\bar f$. These are distinct and separately measurable effects. For CP eigenstate final states, indirect CPV only depends on $\phi_f^M$ (dispersive CPV), whereas $\phi_f^\Gamma$ (absorptive CPV) can only be probed with non-CP eigenstate final states. Measurements of the final state dependent phases $\phi_f^M$, $\phi_f^\Gamma$ determine the intrinsic dispersive and absorptive mixing phases $\phi_2^M$ and $\phi_2^\Gamma$. The latter are the arguments of the dispersive and absorptive mixing amplitudes $M_{12}$ and $\Gamma_{12}$, relative to their dominant ($\Delta U=2$) $U$-spin components. The intrinsic phases are experimentally accessible due to approximate universality: in the SM, and in extensions with negligible new CPV phases in Cabibbo favored/doubly Cabibbo suppressed (CF/DCS) decays, the deviation of $\phi_f^{M,\Gamma}$ from $\phi_2^{M,\Gamma}$ is negligible in CF/DCS decays $D^0 \to K^\pm X$, and below $10\% $ in CF/DCS decays $D^0 \to K_{S,L} X$ (up to precisely known $O(\epsilon_K)$ corrections). In Singly Cabibbo Suppressed (SCS) decays, QCD pollution enters at $O(\epsilon)$ in $U$-spin breaking and can be significant, but is $O(\epsilon^2)$ in the average over $f=K^+K^-$, $\pi^+\pi^-$. SM estimates yield $\phi_2^M, \phi_2^\Gamma = O(0.2\%)$. A fit to current data allows $O(10)$ larger phases at $2\sigma$, from new physics. A fit based on naively extrapolated experimental precision suggests that sensitivity to $\phi_2^{M}$ and $\phi_2^{\Gamma}$ in the SM may be achieved at the LHCb Phase II upgrade.
|
1304.7011
|
David Curtin
|
David Curtin, Prerit Jaiswal, Patrick Meade, Pin-Ju Tien
|
Casting Light on BSM Physics with SM Standard Candles
|
22 pages, 9 figures. Fixed typos
| null |
10.1007/JHEP08(2013)068
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Standard Model (SM) has had resounding success in describing almost every
measurement performed by the ATLAS and CMS experiments. In particular, these
experiments have put many beyond the SM models of natural Electroweak Symmetry
Breaking into tension with the data. It is therefore remarkable that it is
still the LEP experiment, and not the LHC, which often sets the gold standard
for understanding the possibility of new color-neutral states at the
electroweak (EW) scale. Recently, ATLAS and CMS have started to push beyond LEP
in bounding heavy new EW states, but a gap between the exclusions of LEP and
the LHC typically remains. In this paper we show that measurements of SM
Standard Candles can be repurposed to set entirely complementary constraints on
new physics. To demonstrate this, we use WW cross section measurements to set
bounds on a set of slepton-based simplified models which fill in the gaps left
by LEP and dedicated LHC searches. Having demonstrated the sensitivity of the
WW measurement to light sleptons, we also find regions where sleptons can
improve the fit of the data compared to the NLO SM WW prediction alone.
Remarkably, in those regions the sleptons also provide for the right
relic-density of Bino-like Dark Matter and provide an explanation for the
longstanding 3 sigma discrepancy in the measurement of (g-2)_\mu.
|
[
{
"created": "Thu, 25 Apr 2013 20:01:58 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Jun 2014 18:47:35 GMT",
"version": "v2"
}
] |
2015-06-15
|
[
[
"Curtin",
"David",
""
],
[
"Jaiswal",
"Prerit",
""
],
[
"Meade",
"Patrick",
""
],
[
"Tien",
"Pin-Ju",
""
]
] |
The Standard Model (SM) has had resounding success in describing almost every measurement performed by the ATLAS and CMS experiments. In particular, these experiments have put many beyond the SM models of natural Electroweak Symmetry Breaking into tension with the data. It is therefore remarkable that it is still the LEP experiment, and not the LHC, which often sets the gold standard for understanding the possibility of new color-neutral states at the electroweak (EW) scale. Recently, ATLAS and CMS have started to push beyond LEP in bounding heavy new EW states, but a gap between the exclusions of LEP and the LHC typically remains. In this paper we show that measurements of SM Standard Candles can be repurposed to set entirely complementary constraints on new physics. To demonstrate this, we use WW cross section measurements to set bounds on a set of slepton-based simplified models which fill in the gaps left by LEP and dedicated LHC searches. Having demonstrated the sensitivity of the WW measurement to light sleptons, we also find regions where sleptons can improve the fit of the data compared to the NLO SM WW prediction alone. Remarkably, in those regions the sleptons also provide for the right relic-density of Bino-like Dark Matter and provide an explanation for the longstanding 3 sigma discrepancy in the measurement of (g-2)_\mu.
|
0906.2445
|
Rohit Dhir
|
Arvind Sharma, Rohit Dhir and R. C. Verma
|
Branching ratios of weak hadronic decays of bottom baryons emitting
charmless scalar mesons in the pole model
|
21 pages
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We give the first estimate of charmless scalar meson emitting weak hadronic
decays of 0 $\Lembda_{b}^{0}$, $\Xi_{b}^{0}$ and $\Xi_{b}^{-}$ bottom baryons
employing the pole model and consequently predict their branching ratios.
|
[
{
"created": "Sat, 13 Jun 2009 04:41:23 GMT",
"version": "v1"
}
] |
2009-06-16
|
[
[
"Sharma",
"Arvind",
""
],
[
"Dhir",
"Rohit",
""
],
[
"Verma",
"R. C.",
""
]
] |
We give the first estimate of charmless scalar meson emitting weak hadronic decays of 0 $\Lembda_{b}^{0}$, $\Xi_{b}^{0}$ and $\Xi_{b}^{-}$ bottom baryons employing the pole model and consequently predict their branching ratios.
|
hep-ph/0411281
|
Leonid Glozman
|
L. Ya. Glozman
|
Chiral and U(1)_A restorations high in the hadron spectrum,
semiclassical approximation and large N_c
|
11 pages. The ms has been expanded to be a full length regular paper.
A few Tables have been added. A list of references has been extended. To
appear in Int. J. Mod. Phys. A
|
Int.J.Mod.Phys. A21 (2006) 475-486
|
10.1142/S0217751X0602533X
| null |
hep-ph hep-ex hep-lat hep-th nucl-ex nucl-th
| null |
In quantum systems with large $n$ (radial quantum number) or large angular
momentum the semiclassical (WKB) approximation is valid. A physical content of
the semiclassical approximation is that the quantum fluctuations effects are
suppressed and vanish asymptotically. The chiral as well as $U(1)_A$ breakings
in QCD result from quantum fluctuations. Hence these breakings must be
suppressed high in the spectrum and the spectrum of high-lying hadrons must
exhibit $U(2)_L \times U(2)_R$ symmetry of the classical QCD Lagrangian. This
argument can be made stronger for mesons in the large $N_c$ limit. In this
limit all mesons are stable against strong decays and the spectrum is infinite.
Hence, one can excite mesons of arbitrary large size with arbitrary large
action, in which case the semiclassical limit is manifest. Actually we do not
need the exact $N_c=\infty$ limit. For any large action there always exist such
$N_c$ that the isolated mesons with such an action do exist and can be
described semiclassically. From the empirical fact that we observe multiplets
of chiral and $U(1)_A$ groups high in the hadron spectrum it follows that
$N_c=3$ is large enough for this purpose.
|
[
{
"created": "Sun, 21 Nov 2004 10:17:31 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Dec 2004 15:15:51 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Feb 2005 10:25:27 GMT",
"version": "v3"
},
{
"created": "Wed, 22 Jun 2005 08:01:15 GMT",
"version": "v4"
}
] |
2009-11-10
|
[
[
"Glozman",
"L. Ya.",
""
]
] |
In quantum systems with large $n$ (radial quantum number) or large angular momentum the semiclassical (WKB) approximation is valid. A physical content of the semiclassical approximation is that the quantum fluctuations effects are suppressed and vanish asymptotically. The chiral as well as $U(1)_A$ breakings in QCD result from quantum fluctuations. Hence these breakings must be suppressed high in the spectrum and the spectrum of high-lying hadrons must exhibit $U(2)_L \times U(2)_R$ symmetry of the classical QCD Lagrangian. This argument can be made stronger for mesons in the large $N_c$ limit. In this limit all mesons are stable against strong decays and the spectrum is infinite. Hence, one can excite mesons of arbitrary large size with arbitrary large action, in which case the semiclassical limit is manifest. Actually we do not need the exact $N_c=\infty$ limit. For any large action there always exist such $N_c$ that the isolated mesons with such an action do exist and can be described semiclassically. From the empirical fact that we observe multiplets of chiral and $U(1)_A$ groups high in the hadron spectrum it follows that $N_c=3$ is large enough for this purpose.
|
0911.5166
|
Michal Czakon
|
M. Beneke, M. Czakon, P. Falgari, A. Mitov, C. Schwinn
|
Threshold expansion of the gg(qq) -> QQ+X cross section at O(alpha_s^4)
|
11 pages, 2 figures, published erratum included at the end of the
paper, updated attached Mathematica file
|
Phys.Lett.B690:483-490,2010
|
10.1016/j.physletb.2010.05.038
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive the complete set of velocity-enhanced terms in the expansion of the
total cross section for heavy-quark pair production in hadronic collisions at
next-to-next-to-leading order. Our expression takes into account the effects of
soft-gluon emission as well as that of potential-gluon exchanges. We prove that
there are no enhancements due to subleading soft-gluon couplings multiplying
the leading Coulomb singularity.
|
[
{
"created": "Thu, 26 Nov 2009 22:21:33 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Mar 2018 13:26:06 GMT",
"version": "v2"
}
] |
2018-03-13
|
[
[
"Beneke",
"M.",
""
],
[
"Czakon",
"M.",
""
],
[
"Falgari",
"P.",
""
],
[
"Mitov",
"A.",
""
],
[
"Schwinn",
"C.",
""
]
] |
We derive the complete set of velocity-enhanced terms in the expansion of the total cross section for heavy-quark pair production in hadronic collisions at next-to-next-to-leading order. Our expression takes into account the effects of soft-gluon emission as well as that of potential-gluon exchanges. We prove that there are no enhancements due to subleading soft-gluon couplings multiplying the leading Coulomb singularity.
|
hep-ph/9503221
|
Evguenij Rodionov
|
J.T.Londergan, G.T.Garvey, G.Q.Liu, E.N.Rodionov and A.W.Thomas
|
DRELL-YAN PROCESSES AS A PROBE OF CHARGE SYMMETRY VIOLATION IN THE PION
AND NUCLEON
|
11 pages + uuencoded postscript file of 4 figures
|
Phys.Lett.B340:115-121,1994
|
10.1016/0370-2693(94)91306-4
|
ADP-94-5/T147
|
hep-ph
| null |
We extend earlier investigations of charge symmetry violation in the valence
quark distributions of the nucleon, and make similar estimates for the pion.
The sensitivity of pion-induced Drell-Yan measurements to such effects is then
examined. It is shown that combinations of $\pi^+$ and $\pi^-$ data on
deuterium and hydrogen are sensitive to these violations, and that the pion and
nucleon charge symmetry violating terms separate as a function of $x_\pi$ and
$x_N$ respectively. We estimate the background terms which must be evaluated to
extract charge symmetry violation.
|
[
{
"created": "Sun, 5 Mar 1995 02:53:48 GMT",
"version": "v1"
}
] |
2016-09-01
|
[
[
"Londergan",
"J. T.",
""
],
[
"Garvey",
"G. T.",
""
],
[
"Liu",
"G. Q.",
""
],
[
"Rodionov",
"E. N.",
""
],
[
"Thomas",
"A. W.",
""
]
] |
We extend earlier investigations of charge symmetry violation in the valence quark distributions of the nucleon, and make similar estimates for the pion. The sensitivity of pion-induced Drell-Yan measurements to such effects is then examined. It is shown that combinations of $\pi^+$ and $\pi^-$ data on deuterium and hydrogen are sensitive to these violations, and that the pion and nucleon charge symmetry violating terms separate as a function of $x_\pi$ and $x_N$ respectively. We estimate the background terms which must be evaluated to extract charge symmetry violation.
|
1810.05153
|
Rick Gupta
|
S.A. Abel, R.S. Gupta and J. Scholtz
|
Out-of-the-box Baryogenesis During Relaxation
|
8 Pages, 2 Figures
|
Phys. Rev. D 100, 015034 (2019)
|
10.1103/PhysRevD.100.015034
|
IPPP/18/93
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that spontaneous baryogenesis occurs automatically in relaxion models
if the reheating temperature is larger than the weak scale, provided the
Standard Model fields are charged under the U(1) of which the relaxion is a
pseudo-Nambu-Goldstone boson. During the slow roll, the relaxion breaks CPT,
biasing the thermal equilibrium in favor of baryons, with sphalerons providing
the necessary baryon number violation. We calculate the resulting baryon
asymmetry, explore the possible constraints on this scheme and show that there
is a swath of parameter space in which the current observations are matched.
Successful baryogenesis can be achieved for a range of relaxion masses between
$10^{-10}$ and $10^{-5}$ eV. The mechanism operates precisely in the region of
parameter space where recent work has shown relaxion oscillations to be a dark
matter candidate.
|
[
{
"created": "Thu, 11 Oct 2018 17:56:35 GMT",
"version": "v1"
}
] |
2019-07-24
|
[
[
"Abel",
"S. A.",
""
],
[
"Gupta",
"R. S.",
""
],
[
"Scholtz",
"J.",
""
]
] |
We show that spontaneous baryogenesis occurs automatically in relaxion models if the reheating temperature is larger than the weak scale, provided the Standard Model fields are charged under the U(1) of which the relaxion is a pseudo-Nambu-Goldstone boson. During the slow roll, the relaxion breaks CPT, biasing the thermal equilibrium in favor of baryons, with sphalerons providing the necessary baryon number violation. We calculate the resulting baryon asymmetry, explore the possible constraints on this scheme and show that there is a swath of parameter space in which the current observations are matched. Successful baryogenesis can be achieved for a range of relaxion masses between $10^{-10}$ and $10^{-5}$ eV. The mechanism operates precisely in the region of parameter space where recent work has shown relaxion oscillations to be a dark matter candidate.
|
1702.01141
|
Alessandro Strumia
|
Andrea Mitridate, Michele Redi, Juri Smirnov and Alessandro Strumia
|
Cosmological Implications of Dark Matter Bound States
|
40 pages, 11 figures. v3: post-confinement QCD effects added; O(1)
factor fixed
| null |
10.1088/1475-7516/2017/05/006
|
CERN-TH-2017-030, IFUP-TH/2017
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present generic formulae for computing how Sommerfeld corrections together
with bound-state formation affects the thermal abundance of Dark Matter with
non-abelian gauge interactions. We consider DM as a fermion 3plet (wino) or
5plet under SU(2)$_L$. In the latter case bound states raise to 14 TeV the DM
mass required to reproduce the cosmological DM abundance and give indirect
detection signals such as (for this mass) a dominant $\gamma$-line around 85
GeV. Furthermore, we consider DM co-annihilating with a colored particle, such
as a squark or a gluino, finding that bound state effects are especially
relevant in the latter case.
|
[
{
"created": "Fri, 3 Feb 2017 19:58:41 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Feb 2017 15:55:45 GMT",
"version": "v2"
},
{
"created": "Fri, 6 Jul 2018 16:33:03 GMT",
"version": "v3"
}
] |
2018-07-09
|
[
[
"Mitridate",
"Andrea",
""
],
[
"Redi",
"Michele",
""
],
[
"Smirnov",
"Juri",
""
],
[
"Strumia",
"Alessandro",
""
]
] |
We present generic formulae for computing how Sommerfeld corrections together with bound-state formation affects the thermal abundance of Dark Matter with non-abelian gauge interactions. We consider DM as a fermion 3plet (wino) or 5plet under SU(2)$_L$. In the latter case bound states raise to 14 TeV the DM mass required to reproduce the cosmological DM abundance and give indirect detection signals such as (for this mass) a dominant $\gamma$-line around 85 GeV. Furthermore, we consider DM co-annihilating with a colored particle, such as a squark or a gluino, finding that bound state effects are especially relevant in the latter case.
|
0805.4803
|
Gabriel Zarnauskas
|
D. R. Boito, P. C. Magalh\~aes, M. R. Robilotta and G. R. S.
Zarnauskas
|
Decay $D^+ \to K^- \pi^+ \pi^+$: chiral symmetry and scalar resonances
|
31 pages, 21 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The low-energy S-wave component of the decay $D^+ \to K^- \pi^+ \pi^+$ is
studied by means of a chiral SU(3)XSU(3) effective theory. As far as the
primary vertex is concerned, we allow for the possibility of either direct
production of three pseudoscalar mesons or a meson and a scalar resonance.
Special attention is paid to final state interactions associated with elastic
meson-meson scattering. The corresponding two-body amplitude is unitarized by
ressumming s-channel diagrams and can be expressed in terms of the usal phase
shifts $\delta$. This procedure preserves the chiral properties of the
amplitude at low-energies. Final state interactions also involve another phase
$\omega$, which describes intermediate two-meson propagation and is
theoretically unambiguous. This phase is absent in the K-matrix approximation.
Partial contributions to the decay amplitude involve a real term, another one
with phase $\delta$ and several others with phases $\delta+\omega$. Our main
result is a simple and almost model independent chiral generalization of the
usual Breit-Wigner expression, suited to be used in analyses of production data
involving scalar resonances.
|
[
{
"created": "Fri, 30 May 2008 16:44:30 GMT",
"version": "v1"
}
] |
2008-06-02
|
[
[
"Boito",
"D. R.",
""
],
[
"Magalhães",
"P. C.",
""
],
[
"Robilotta",
"M. R.",
""
],
[
"Zarnauskas",
"G. R. S.",
""
]
] |
The low-energy S-wave component of the decay $D^+ \to K^- \pi^+ \pi^+$ is studied by means of a chiral SU(3)XSU(3) effective theory. As far as the primary vertex is concerned, we allow for the possibility of either direct production of three pseudoscalar mesons or a meson and a scalar resonance. Special attention is paid to final state interactions associated with elastic meson-meson scattering. The corresponding two-body amplitude is unitarized by ressumming s-channel diagrams and can be expressed in terms of the usal phase shifts $\delta$. This procedure preserves the chiral properties of the amplitude at low-energies. Final state interactions also involve another phase $\omega$, which describes intermediate two-meson propagation and is theoretically unambiguous. This phase is absent in the K-matrix approximation. Partial contributions to the decay amplitude involve a real term, another one with phase $\delta$ and several others with phases $\delta+\omega$. Our main result is a simple and almost model independent chiral generalization of the usual Breit-Wigner expression, suited to be used in analyses of production data involving scalar resonances.
|
1711.05449
|
Michihisa Takeuchi
|
Shigeki Matsumoto, Satoshi Shirai, and Michihisa Takeuchi
|
Indirect Probe of Electroweakly Interacting Particles at the
High-Luminosity Large Hadron Collider
|
11 pages, 4 figures
| null |
10.1007/JHEP06(2018)049
|
IPMU17-0162
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Many extensions of the standard model (SM) involve new massive particles
charged under the electroweak gauge symmetry. The electroweakly interacting new
particles affect various SM processes through radiative corrections. We discuss
the possibility of detecting such new particles based on the precise
measurement of the SM processes at high energy hadron colliders. It then turns
out that Drell-Yan processes receive radiative corrections from the
electroweakly interacting particles at the level of ${\cal O}$(0.1-10) %. It is
hence possible to indirectly search for the Higgsino up to the mass of 400 GeV
and the quintet (5-plet) Majorana fermion up to the mass of 1200 GeV at the
high-luminosity running of the Large Hadron Collider, if the systematic
uncertainty associated with the estimation of the SM background becomes lower
than the statistical one.
|
[
{
"created": "Wed, 15 Nov 2017 08:35:32 GMT",
"version": "v1"
}
] |
2018-07-04
|
[
[
"Matsumoto",
"Shigeki",
""
],
[
"Shirai",
"Satoshi",
""
],
[
"Takeuchi",
"Michihisa",
""
]
] |
Many extensions of the standard model (SM) involve new massive particles charged under the electroweak gauge symmetry. The electroweakly interacting new particles affect various SM processes through radiative corrections. We discuss the possibility of detecting such new particles based on the precise measurement of the SM processes at high energy hadron colliders. It then turns out that Drell-Yan processes receive radiative corrections from the electroweakly interacting particles at the level of ${\cal O}$(0.1-10) %. It is hence possible to indirectly search for the Higgsino up to the mass of 400 GeV and the quintet (5-plet) Majorana fermion up to the mass of 1200 GeV at the high-luminosity running of the Large Hadron Collider, if the systematic uncertainty associated with the estimation of the SM background becomes lower than the statistical one.
|
2209.14305
|
David Morrissey
|
Alexandre Carvunis, Navin McGinnis, and David E. Morrissey
|
Relic Challenges for Vector-Like Fermions as Connectors to a Dark Sector
|
32 pages, 5 figures, added references, corrected plotting error,
conclusions unchanged
| null |
10.1007/JHEP01(2023)014
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
New dark sectors consisting of exotic fields that couple only very feebly to
the Standard Model (SM) have strong theoretical motivation and may be relevant
to explaining the abundance of dark matter (DM). An important question for such
sectors is how they connect to the SM. For a dark sector with a new gauge
interaction, a natural connection arises from heavy vector-like fermions
charged under both the visible and dark gauge groups. The gauge charges of such
fermions imply that one or more of them is stable in the absence of additional
sources of dark symmetry breaking. A generic challenge for such connectors is
that they can produce too much dark matter or interact too strongly with nuclei
if they were ever thermalized in the early universe. In this paper we study
this challenge in a simple connector theory consisting of new vector-like
electroweak doublet and singlet fermions that also transform under the
fundamental representation of a new (Abelian) gauge force, and we show that
these connectors in their minimal form are almost always ruled out by existing
direct DM searches. To address this challenge, we investigate two solutions.
First, we study mitigating scattering on nuclei by introducing a Majorana mass
term for the singlet. And second, we investigate a mixing with SM leptons that
allows the connectors to decay while remaining consistent with cosmological
tests and searches for charged lepton flavor violation. Both solutions rely on
the presence of a dark Higgs field with a specific charge.
|
[
{
"created": "Wed, 28 Sep 2022 18:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Oct 2022 17:53:20 GMT",
"version": "v2"
}
] |
2023-01-25
|
[
[
"Carvunis",
"Alexandre",
""
],
[
"McGinnis",
"Navin",
""
],
[
"Morrissey",
"David E.",
""
]
] |
New dark sectors consisting of exotic fields that couple only very feebly to the Standard Model (SM) have strong theoretical motivation and may be relevant to explaining the abundance of dark matter (DM). An important question for such sectors is how they connect to the SM. For a dark sector with a new gauge interaction, a natural connection arises from heavy vector-like fermions charged under both the visible and dark gauge groups. The gauge charges of such fermions imply that one or more of them is stable in the absence of additional sources of dark symmetry breaking. A generic challenge for such connectors is that they can produce too much dark matter or interact too strongly with nuclei if they were ever thermalized in the early universe. In this paper we study this challenge in a simple connector theory consisting of new vector-like electroweak doublet and singlet fermions that also transform under the fundamental representation of a new (Abelian) gauge force, and we show that these connectors in their minimal form are almost always ruled out by existing direct DM searches. To address this challenge, we investigate two solutions. First, we study mitigating scattering on nuclei by introducing a Majorana mass term for the singlet. And second, we investigate a mixing with SM leptons that allows the connectors to decay while remaining consistent with cosmological tests and searches for charged lepton flavor violation. Both solutions rely on the presence of a dark Higgs field with a specific charge.
|
2105.03419
|
Digesh Raut
|
Nobuchika Okada, Digesh Raut, Qaisar Shafi and Anil Thapa
|
Pseudo-Goldstone Dark Matter in $SO(10)$
|
25 pages, 5 figures, Figures 3 revised, updated version accepted for
publication in PRD
| null |
10.1103/PhysRevD.104.095002
| null |
hep-ph astro-ph.HE hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We propose a pseudo-Goldstone boson dark matter (pGDM) particle in $SO(10)$
grand unified theory (GUT). Due to its Goldstone nature, this pGDM evades the
direct DM detection experiments which, otherwise, severely constrain the
parameter space of DM models. In $SO(10)$, the pGDM is embedded as a linear
combination of the Standard Model (SM) singlet scalars in ${\bf 16_H}$ and
${\bf 126_H}$ representations. We consider two scenarios for the intermediate
route of $SO(10)$ symmetry breaking (SB) to the SM: $SU(5) \times U(1)_X$ and
Pati-Salam the $SU(4)_c \times SU(2)_L \times SU(2)_R$ (4-2-2) gauge groups.
The vacuum expectation value of ${\bf 126_H}$, which triggers the breaking of
$U(1)_X$ and 4-2-2 symmetry in the two scenarios, respectively, determines the
pGDM lifetime whose astrophysical lower bound provides one of the most
stringent constraints. For the 4-2-2 route to $SO(10)$, the successful SM gauge
coupling unification requires the 4-2-2 breaking scale to be ${\cal O}
(10^{11})$ GeV, and most of the parameter space is excluded. For the $SU(5)
\times U(1)_X$ route, on the other hand, the $U(1)_X$ breaking scale can be
significantly higher, and a wide range of the parameter space is allowed.
Furthermore, the proton lifetime in the $SU(5)$ case is predicted to be $4.53
\times 10^{34}$ years, which lies well within the sensitivity reach of the
Hyper-Kamiokande experiment. We also examine the constraints on the model
parameter space from the Large Hadron Collider and the indirect DM search by
Fermi-LAT and MAGIC experiments.
|
[
{
"created": "Fri, 7 May 2021 17:50:37 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Oct 2021 16:36:07 GMT",
"version": "v2"
}
] |
2021-11-17
|
[
[
"Okada",
"Nobuchika",
""
],
[
"Raut",
"Digesh",
""
],
[
"Shafi",
"Qaisar",
""
],
[
"Thapa",
"Anil",
""
]
] |
We propose a pseudo-Goldstone boson dark matter (pGDM) particle in $SO(10)$ grand unified theory (GUT). Due to its Goldstone nature, this pGDM evades the direct DM detection experiments which, otherwise, severely constrain the parameter space of DM models. In $SO(10)$, the pGDM is embedded as a linear combination of the Standard Model (SM) singlet scalars in ${\bf 16_H}$ and ${\bf 126_H}$ representations. We consider two scenarios for the intermediate route of $SO(10)$ symmetry breaking (SB) to the SM: $SU(5) \times U(1)_X$ and Pati-Salam the $SU(4)_c \times SU(2)_L \times SU(2)_R$ (4-2-2) gauge groups. The vacuum expectation value of ${\bf 126_H}$, which triggers the breaking of $U(1)_X$ and 4-2-2 symmetry in the two scenarios, respectively, determines the pGDM lifetime whose astrophysical lower bound provides one of the most stringent constraints. For the 4-2-2 route to $SO(10)$, the successful SM gauge coupling unification requires the 4-2-2 breaking scale to be ${\cal O} (10^{11})$ GeV, and most of the parameter space is excluded. For the $SU(5) \times U(1)_X$ route, on the other hand, the $U(1)_X$ breaking scale can be significantly higher, and a wide range of the parameter space is allowed. Furthermore, the proton lifetime in the $SU(5)$ case is predicted to be $4.53 \times 10^{34}$ years, which lies well within the sensitivity reach of the Hyper-Kamiokande experiment. We also examine the constraints on the model parameter space from the Large Hadron Collider and the indirect DM search by Fermi-LAT and MAGIC experiments.
|
hep-ph/0201095
|
Kai Schwenzer
|
T. Spitzenberg, K. Schwenzer and H.-J. Pirner
|
The Spectrum of the Dirac Operator in the Linear Sigma Model with Quarks
|
15 pages, 6 figures, to appear in Phys. Rev. D
|
Phys.Rev. D65 (2002) 074017
|
10.1103/PhysRevD.65.074017
| null |
hep-ph
| null |
We derive the spectrum of the Dirac operator for the linear sigma-model with
quarks in the large N_c approximation using renormalization group flow
equations. For small eigenvalues, the Banks-Casher relation and the vanishing
linear term are recovered. We calculate the coefficient of the next to leading
term and investigate the spectrum beyond the low energy regime.
|
[
{
"created": "Fri, 11 Jan 2002 16:55:25 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Spitzenberg",
"T.",
""
],
[
"Schwenzer",
"K.",
""
],
[
"Pirner",
"H. -J.",
""
]
] |
We derive the spectrum of the Dirac operator for the linear sigma-model with quarks in the large N_c approximation using renormalization group flow equations. For small eigenvalues, the Banks-Casher relation and the vanishing linear term are recovered. We calculate the coefficient of the next to leading term and investigate the spectrum beyond the low energy regime.
|
0810.0971
|
Jonathan Parry
|
J. K. Parry
|
The large CP phase in B(s)-anti-B(s) mixing from primary scalar
unparticles
|
8 pages, 8 jpeg figures, using pdflatex. Typo corrected, reference
added
|
Mod.Phys.Lett.A24:1835-1846,2009
|
10.1142/S0217732309030175
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this letter we consider the case of primary scalar unparticle
contributions to B(d,s) mixing. With particular emphasis on the impact of the
recent hint of new physics in the measurement of the B(s) mixing phase, phi(s),
we determine the allowed parameter space and impose bounds on the unparticle
couplings.
|
[
{
"created": "Mon, 6 Oct 2008 14:12:58 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Oct 2008 08:48:29 GMT",
"version": "v2"
}
] |
2014-11-18
|
[
[
"Parry",
"J. K.",
""
]
] |
In this letter we consider the case of primary scalar unparticle contributions to B(d,s) mixing. With particular emphasis on the impact of the recent hint of new physics in the measurement of the B(s) mixing phase, phi(s), we determine the allowed parameter space and impose bounds on the unparticle couplings.
|
0707.3488
|
Arvind Rajaraman
|
Jason Kumar, Arvind Rajaraman, James D. Wells
|
Probing the Green-Schwarz Mechanism at the Large Hadron Collider
|
14 pages, references added
|
Phys.Rev.D77:066011,2008
|
10.1103/PhysRevD.77.066011
| null |
hep-ph
| null |
We investigate the phenomenology of new abelian gauge bosons, which we denote
as $X$ bosons, that suffer a mixed anomaly with the Standard Model, but are
made self-consistent by the Green-Schwarz mechanism. A distinguishing aspect of
the resulting effective theory is the decay of $X$ bosons into Standard Model
gauge bosons, $X\to ZZ, WW, \gamma Z$. We compute the production cross-section
of the $X$ boson from vector boson fusion at the Large Hadron Collider. We
study the $pp\to X\to ZZ\to 4l$ signal, and analyze the prospects of discovery.
We argue that such a discovery could indirectly probe high energies, even up to
the string scale.
|
[
{
"created": "Tue, 24 Jul 2007 06:04:46 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Nov 2007 04:57:13 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Kumar",
"Jason",
""
],
[
"Rajaraman",
"Arvind",
""
],
[
"Wells",
"James D.",
""
]
] |
We investigate the phenomenology of new abelian gauge bosons, which we denote as $X$ bosons, that suffer a mixed anomaly with the Standard Model, but are made self-consistent by the Green-Schwarz mechanism. A distinguishing aspect of the resulting effective theory is the decay of $X$ bosons into Standard Model gauge bosons, $X\to ZZ, WW, \gamma Z$. We compute the production cross-section of the $X$ boson from vector boson fusion at the Large Hadron Collider. We study the $pp\to X\to ZZ\to 4l$ signal, and analyze the prospects of discovery. We argue that such a discovery could indirectly probe high energies, even up to the string scale.
|
1009.3244
|
Bj\"orn Schenke
|
Bjoern Schenke, Sangyong Jeon and Charles Gale
|
Elliptic and triangular flow in event-by-event (3+1)D viscous
hydrodynamics
|
4 pages, 5 figures, version 2 includes resonance decays in the
results, references added, minor typos corrected
|
Phys.Rev.Lett.106:042301,2011
|
10.1103/PhysRevLett.106.042301
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present results for the elliptic and triangular flow coefficients in Au+Au
collisions at root-s=200 AGeV using event-by-event (3+1)D viscous hydrodynamic
simulations. We study the effect of initial state fluctuations and finite
viscosities on the flow coefficients v_2 and v_3 as functions of transverse
momentum and pseudo-rapidity. Fluctuations are essential to reproduce the
measured centrality dependence of elliptic flow. We argue that simultaneous
measurements of v_2 and v_3 can determine eta/s more precisely.
|
[
{
"created": "Thu, 16 Sep 2010 18:58:22 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Oct 2010 19:04:52 GMT",
"version": "v2"
}
] |
2011-02-02
|
[
[
"Schenke",
"Bjoern",
""
],
[
"Jeon",
"Sangyong",
""
],
[
"Gale",
"Charles",
""
]
] |
We present results for the elliptic and triangular flow coefficients in Au+Au collisions at root-s=200 AGeV using event-by-event (3+1)D viscous hydrodynamic simulations. We study the effect of initial state fluctuations and finite viscosities on the flow coefficients v_2 and v_3 as functions of transverse momentum and pseudo-rapidity. Fluctuations are essential to reproduce the measured centrality dependence of elliptic flow. We argue that simultaneous measurements of v_2 and v_3 can determine eta/s more precisely.
|
1309.7377
|
Huaiyu Duan
|
Huaiyu Duan
|
Flavor Oscillation Modes In Dense Neutrino Media
|
7 pages, 1 figure (6 panels)
|
PRD88, 125008 (2013)
|
10.1103/PhysRevD.88.125008
| null |
hep-ph astro-ph.HE nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study two-flavor neutrino oscillations in homogeneous neutrino gases in
which neutrinos and anti-neutrinos are in nearly pure weak interaction states
initially. We find that the monopole and dipole oscillation modes can trigger
flavor instabilities in the opposite neutrino mass hierarchies in a nearly
isotropic neutrino gas. For a class of simple neutrino systems we are able to
identify the normal modes of neutrino oscillations in the linear regime. Our
results provide new insights into the recently discovered multi-azimuthal angle
(MAA) instability of neutrino oscillations in supernovae.
|
[
{
"created": "Fri, 27 Sep 2013 21:57:53 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Nov 2013 22:31:28 GMT",
"version": "v2"
}
] |
2014-01-10
|
[
[
"Duan",
"Huaiyu",
""
]
] |
We study two-flavor neutrino oscillations in homogeneous neutrino gases in which neutrinos and anti-neutrinos are in nearly pure weak interaction states initially. We find that the monopole and dipole oscillation modes can trigger flavor instabilities in the opposite neutrino mass hierarchies in a nearly isotropic neutrino gas. For a class of simple neutrino systems we are able to identify the normal modes of neutrino oscillations in the linear regime. Our results provide new insights into the recently discovered multi-azimuthal angle (MAA) instability of neutrino oscillations in supernovae.
|
1106.2285
|
Ara Ioannisian Dr.
|
A.N. Ioannisian, D.A. Ioannisian and N.A. Kazarian
|
Transition Radiation by Standard Model Neutrinos at an Interface
|
invited talk, to appear in the proceedings of the XLVIth Rencontres
de Moriond EW 2011
| null | null | null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the transition radiation process $\nu \to \nu \gamma$ at an
interface of two media. The medium fulfills the dual purpose of inducing an
effective neutrino-photon vertex and of modifying the photon dispersion
relation. The transition radiation occurs when at least one of those quantities
have different values in different media. We present a result for the
probability of the transition radiation which is both accurate and analytic.
For $E_\nu =1$MeV neutrino crossing polyethylene-vacuum interface the
transition radiation probability is about $10^{-39}$ and the energy intensity
(deposition) is about $10^{-34}$eV. At the surface of the neutron stars the
transition radiation probability may be $\sim 10^{-20}$. Our result on three
orders of magnitude is larger than the results of previous calculations.}
|
[
{
"created": "Sun, 12 Jun 2011 06:58:06 GMT",
"version": "v1"
}
] |
2011-11-10
|
[
[
"Ioannisian",
"A. N.",
""
],
[
"Ioannisian",
"D. A.",
""
],
[
"Kazarian",
"N. A.",
""
]
] |
We discuss the transition radiation process $\nu \to \nu \gamma$ at an interface of two media. The medium fulfills the dual purpose of inducing an effective neutrino-photon vertex and of modifying the photon dispersion relation. The transition radiation occurs when at least one of those quantities have different values in different media. We present a result for the probability of the transition radiation which is both accurate and analytic. For $E_\nu =1$MeV neutrino crossing polyethylene-vacuum interface the transition radiation probability is about $10^{-39}$ and the energy intensity (deposition) is about $10^{-34}$eV. At the surface of the neutron stars the transition radiation probability may be $\sim 10^{-20}$. Our result on three orders of magnitude is larger than the results of previous calculations.}
|
0801.3232
|
Massimiliano Grazzini
|
M. Grazzini
|
NNLO predictions for the Higgs boson signal in the H->WW->lnu lnu and
H->ZZ->4l decay channels
|
References added. Version published on JHEP
|
JHEP 0802:043,2008
|
10.1088/1126-6708/2008/02/043
| null |
hep-ph hep-ex
| null |
We consider Standard Model Higgs boson production by gluon--gluon fusion in
hadron collisions. We present a calculation of the next-to-next-to-leading
order QCD corrections to the cross section in the H->WW->lnu lnu and H->ZZ->4l
decay channels. The calculation is implemented in the parton level Monte Carlo
program HNNLO and allows us to apply arbitrary cuts on the final state leptons
and the associated jet activity. We present selected numerical results for the
signal cross section at the LHC, by using all the nominal cuts proposed for the
forthcoming Higgs boson search.
|
[
{
"created": "Mon, 21 Jan 2008 17:39:49 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Feb 2008 11:03:17 GMT",
"version": "v2"
}
] |
2008-12-30
|
[
[
"Grazzini",
"M.",
""
]
] |
We consider Standard Model Higgs boson production by gluon--gluon fusion in hadron collisions. We present a calculation of the next-to-next-to-leading order QCD corrections to the cross section in the H->WW->lnu lnu and H->ZZ->4l decay channels. The calculation is implemented in the parton level Monte Carlo program HNNLO and allows us to apply arbitrary cuts on the final state leptons and the associated jet activity. We present selected numerical results for the signal cross section at the LHC, by using all the nominal cuts proposed for the forthcoming Higgs boson search.
|
2309.10417
|
Toni M\"akel\"a
|
Felix Kling, Toni M\"akel\"a, Sebastian Trojanowski
|
Investigating the fluxes and physics potential of LHC neutrino
experiments
|
21 pages, 5 figures
|
Phys. Rev. D 108, 095020 (2023)
|
10.1103/PhysRevD.108.095020
|
DESY-23-131
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The initiation of a novel neutrino physics program at the Large Hadron
Collider (LHC) and the purpose-built Forward Physics Facility (FPF) proposal
have motivated studies exploring the discovery potential of these searches.
This requires resolving degeneracies between new predictions and uncertainties
in modeling neutrino production in the forward kinematic region. The present
work investigates a broad selection of existing predictions for the parent
hadron spectra at FASER$\nu$ and the FPF to parameterize expected correlations
in the neutrino spectra produced in their decays and to determine the highest
achievable precision for their observation based on Fisher information. This
allows for setting constraints on various physics processes within and beyond
the Standard Model, including neutrino non-standard interactions. We also
illustrate how combining multiple neutrino observables could lead to
experimental confirmation of the enhanced-strangeness scenario proposed to
resolve the cosmic-ray muon puzzle already during the ongoing LHC Run 3.
|
[
{
"created": "Tue, 19 Sep 2023 08:29:34 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Nov 2023 11:08:51 GMT",
"version": "v2"
}
] |
2023-11-16
|
[
[
"Kling",
"Felix",
""
],
[
"Mäkelä",
"Toni",
""
],
[
"Trojanowski",
"Sebastian",
""
]
] |
The initiation of a novel neutrino physics program at the Large Hadron Collider (LHC) and the purpose-built Forward Physics Facility (FPF) proposal have motivated studies exploring the discovery potential of these searches. This requires resolving degeneracies between new predictions and uncertainties in modeling neutrino production in the forward kinematic region. The present work investigates a broad selection of existing predictions for the parent hadron spectra at FASER$\nu$ and the FPF to parameterize expected correlations in the neutrino spectra produced in their decays and to determine the highest achievable precision for their observation based on Fisher information. This allows for setting constraints on various physics processes within and beyond the Standard Model, including neutrino non-standard interactions. We also illustrate how combining multiple neutrino observables could lead to experimental confirmation of the enhanced-strangeness scenario proposed to resolve the cosmic-ray muon puzzle already during the ongoing LHC Run 3.
|
2307.12686
|
Mohammad Sajjad Athar
|
A. Fatima, M. Sajjad Athar, and S. K. Singh
|
Weak production of $\eta$ mesons induced by $\nu_{\mu}(\bar{\nu}_\mu)$
at MicroBooNE energies
|
Physical Review D (in press). arXiv admin note: substantial text
overlap with arXiv:2211.08830
| null | null | null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We have studied neutral and charged current (anti)neutrino induced $\eta$
production off the free nucleon target at MicroBooNE energies, in the light of
recent results reported by the MicroBooNE collaboration for the total $\eta$
production cross section. This study has been made using a theoretical model in
which the weak hadronic current receives contribution from the nonresonant Born
terms as well as from the resonance excitations. The Born terms are obtained
using the SU(3) symmetric chiral model, used earlier in the study of $K-$meson
production. The contribution from the resonance terms is considered from the
excitation of five nucleon resonances viz. $S_{11}(1535)$, $S_{11}(1650)$,
$P_{11}(1710)$, $P_{11}(1880)$, and $S_{11}(1895)$. To fix the parameters of
the vector current interaction, this model is first used to study the
electromagnetic production of $\eta$ mesons induced by real and virtual
photons, and the theoretical results have been compared with the data from the
MAINZ and JLab experiments. The partially conserved axial-vector current
hypothesis and generalized Goldberger-Treiman relation are used to fix the
parameters of the axial-vector current interaction. The results are presented
for the total cross section for the neutral and charged current induced $\eta$
production, ratio of the cross sections for the charged current to neutral
current, MicroBooNE flux averaged cross section $\langle \sigma \rangle$,
$\left \langle \frac{d\sigma}{dQ^2} \right\rangle$ and $\left\langle
\frac{d\sigma}{dp_\eta} \right\rangle$, which may be useful in the future
analysis of MicroBooNE as well as other accelerator and atmospheric neutrino
experiments being performed in the ${\cal O}$(1)~GeV energy region.
|
[
{
"created": "Mon, 24 Jul 2023 11:02:15 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Sep 2023 12:50:45 GMT",
"version": "v2"
}
] |
2023-09-22
|
[
[
"Fatima",
"A.",
""
],
[
"Athar",
"M. Sajjad",
""
],
[
"Singh",
"S. K.",
""
]
] |
We have studied neutral and charged current (anti)neutrino induced $\eta$ production off the free nucleon target at MicroBooNE energies, in the light of recent results reported by the MicroBooNE collaboration for the total $\eta$ production cross section. This study has been made using a theoretical model in which the weak hadronic current receives contribution from the nonresonant Born terms as well as from the resonance excitations. The Born terms are obtained using the SU(3) symmetric chiral model, used earlier in the study of $K-$meson production. The contribution from the resonance terms is considered from the excitation of five nucleon resonances viz. $S_{11}(1535)$, $S_{11}(1650)$, $P_{11}(1710)$, $P_{11}(1880)$, and $S_{11}(1895)$. To fix the parameters of the vector current interaction, this model is first used to study the electromagnetic production of $\eta$ mesons induced by real and virtual photons, and the theoretical results have been compared with the data from the MAINZ and JLab experiments. The partially conserved axial-vector current hypothesis and generalized Goldberger-Treiman relation are used to fix the parameters of the axial-vector current interaction. The results are presented for the total cross section for the neutral and charged current induced $\eta$ production, ratio of the cross sections for the charged current to neutral current, MicroBooNE flux averaged cross section $\langle \sigma \rangle$, $\left \langle \frac{d\sigma}{dQ^2} \right\rangle$ and $\left\langle \frac{d\sigma}{dp_\eta} \right\rangle$, which may be useful in the future analysis of MicroBooNE as well as other accelerator and atmospheric neutrino experiments being performed in the ${\cal O}$(1)~GeV energy region.
|
0709.3341
|
Antonio Vairo
|
Antonio Vairo
|
The QCD potential
|
8 pages, 7 figures; plenary talk given at QCD@Work 2007, Martina
Franca, June 16-20, 2007
|
AIPConf.Proc.964:102-109,2007
|
10.1063/1.2823834
|
IFUM-895-FT
|
hep-ph
| null |
After reviewing the definition of the heavy quark-antiquark potential in
pNRQCD, we discuss recent advances in the calculation.
|
[
{
"created": "Fri, 21 Sep 2007 14:09:37 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Vairo",
"Antonio",
""
]
] |
After reviewing the definition of the heavy quark-antiquark potential in pNRQCD, we discuss recent advances in the calculation.
|
1611.08795
|
Sabyasachi Roy
|
Sabyasachi Roy and D K Choudhury
|
A Potential Model Approach in the Study of Static and Dynamic properties
of Heavy-Light Quark-Antiquark Systems
| null |
Quantum Matter, Vol 5 (2016) 1-8
|
10.1166/qm.2016.1355
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report some approximate analytic form of meson wave function constructed
upon solving Schrodinger equation with linear plus Coulomb type Cornell
potential. With this wave function, we study Isgur-Wise function and its
derivatives for heavy-light mesons in the infinite heavy quark mass limit. We
also explore the elastic form factors, charge radii and decay constants of
pseudoscalar mesons in this QCD inspired quark model approach.
|
[
{
"created": "Sun, 27 Nov 2016 05:42:01 GMT",
"version": "v1"
}
] |
2016-11-29
|
[
[
"Roy",
"Sabyasachi",
""
],
[
"Choudhury",
"D K",
""
]
] |
We report some approximate analytic form of meson wave function constructed upon solving Schrodinger equation with linear plus Coulomb type Cornell potential. With this wave function, we study Isgur-Wise function and its derivatives for heavy-light mesons in the infinite heavy quark mass limit. We also explore the elastic form factors, charge radii and decay constants of pseudoscalar mesons in this QCD inspired quark model approach.
|
hep-ph/0006358
|
J. Michael Niczyporuk
|
F. Maltoni, J. M. Niczyporuk, and S. Willenbrock (University of
Illinois at Urbana-Champaign)
|
Upper bound on the scale of Majorana-neutrino mass generation
|
6 pages, 3 figures; REVTeX; published version
|
Phys.Rev.Lett. 86 (2001) 212-215
|
10.1103/PhysRevLett.86.212
|
ILL-(TH)-00-05
|
hep-ph
| null |
We derive a model-independent upper bound on the scale of Majorana-neutrino
mass generation. The upper bound is $4\pi v^2/\sqrt 3 m_\nu$, where $v \simeq
246$ GeV is the weak scale and $m_\nu$ is the Majorana neutrino mass. For
neutrino masses implied by neutrino oscillation experiments, all but one of
these bounds are less than the Planck scale, and they are all within a few
orders of magnitude of the grand-unification scale.
|
[
{
"created": "Fri, 30 Jun 2000 21:46:33 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jan 2001 00:01:48 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Maltoni",
"F.",
"",
"University of\n Illinois at Urbana-Champaign"
],
[
"Niczyporuk",
"J. M.",
"",
"University of\n Illinois at Urbana-Champaign"
],
[
"Willenbrock",
"S.",
"",
"University of\n Illinois at Urbana-Champaign"
]
] |
We derive a model-independent upper bound on the scale of Majorana-neutrino mass generation. The upper bound is $4\pi v^2/\sqrt 3 m_\nu$, where $v \simeq 246$ GeV is the weak scale and $m_\nu$ is the Majorana neutrino mass. For neutrino masses implied by neutrino oscillation experiments, all but one of these bounds are less than the Planck scale, and they are all within a few orders of magnitude of the grand-unification scale.
|
1611.02353
|
Marcin Badziak
|
Marcin Badziak, Carlos E. M. Wagner
|
Enhanced Higgs associated production with a top quark pair in the NMSSM
with light singlets
|
17 pages; v2: discussion on unphysical global minima and new
benchmark table added; matches published version
| null |
10.1007/JHEP02(2017)050
|
EFI-16-24
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Precision measurements of the 125 GeV Higgs resonance recently discovered at
the LHC have determined that its properties are similar to the ones of the
Standard Model (SM) Higgs boson. However, the current uncertainties in the
determination of the Higgs boson couplings leave room for significant
deviations from the SM expectations. In fact, if one assumes no correlation
between the top-quark and gluon couplings to the Higgs, the current global fit
to the Higgs data lead to central values of the Higgs couplings to the
bottom-quark and the top-quark that are about 2 $\sigma$ away from the SM
predictions. In a previous work, we showed that such a scenario could be
realized in the Next to Minimal Supersymmetric extension of the SM (NMSSM), for
heavy singlets and light MSSM-like Higgs bosons and scalar top quarks, but for
couplings that ruined the perturbative consistency of the theory up to the GUT
scale. In this work we show that a perturbative consistent scenario, for
somewhat heavier stops, may be obtained in the presence of light singlets. An
interesting bonus of this scenario is the possibility of explaining an excess
of events observed in CP-even Higgs searches at LEP2.
|
[
{
"created": "Tue, 8 Nov 2016 01:10:19 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Feb 2017 03:38:24 GMT",
"version": "v2"
}
] |
2017-02-20
|
[
[
"Badziak",
"Marcin",
""
],
[
"Wagner",
"Carlos E. M.",
""
]
] |
Precision measurements of the 125 GeV Higgs resonance recently discovered at the LHC have determined that its properties are similar to the ones of the Standard Model (SM) Higgs boson. However, the current uncertainties in the determination of the Higgs boson couplings leave room for significant deviations from the SM expectations. In fact, if one assumes no correlation between the top-quark and gluon couplings to the Higgs, the current global fit to the Higgs data lead to central values of the Higgs couplings to the bottom-quark and the top-quark that are about 2 $\sigma$ away from the SM predictions. In a previous work, we showed that such a scenario could be realized in the Next to Minimal Supersymmetric extension of the SM (NMSSM), for heavy singlets and light MSSM-like Higgs bosons and scalar top quarks, but for couplings that ruined the perturbative consistency of the theory up to the GUT scale. In this work we show that a perturbative consistent scenario, for somewhat heavier stops, may be obtained in the presence of light singlets. An interesting bonus of this scenario is the possibility of explaining an excess of events observed in CP-even Higgs searches at LEP2.
|
1911.00933
|
Mikl\'os Horv\'ath
|
Miklos Horvath, Defu Hou, Jinfeng Liao, Hai-cang Ren
|
Chiral magnetic response to arbitrary axial imbalance
|
21 pages, 5 figures. v2: substantial changes of text, fig. 3 updated,
practically matches journal version
|
Phys. Rev. D 101, 076026 (2020)
|
10.1103/PhysRevD.101.076026
| null |
hep-ph cond-mat.str-el hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The response of chiral fermions to time and space dependent axial imbalance &
constant magnetic field is analyzed. The axialvector-vector-vector (AVV)
three-point function is studied using a real-time approach at finite
temperature in the weak external field approximation. The chiral magnetic
conductivity is given analytically for noninteracting fermions. It is pointed
out that local charge conservation plays an important role when the axial
imbalance is inhomogeneous. Proper regularization is needed which makes the
constant axial imbalance limit delicate: for static but spatially oscillating
chiral charge the current of the chiral magnetic effect (CME) vanishes. In the
homogeneous (but possible time-dependent) limit of the axial imbalance the CME
current is determined solely by the chiral anomaly. As a phenomenological
consequence, the observability of the charge asymmetry caused by the CME turns
out to be a matter of interplay between various scales of the system. Possible
plasma instabilities resulting from the gradient corrections to the CME current
are also pointed out.
|
[
{
"created": "Sun, 3 Nov 2019 17:28:51 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Apr 2020 14:45:15 GMT",
"version": "v2"
}
] |
2020-05-01
|
[
[
"Horvath",
"Miklos",
""
],
[
"Hou",
"Defu",
""
],
[
"Liao",
"Jinfeng",
""
],
[
"Ren",
"Hai-cang",
""
]
] |
The response of chiral fermions to time and space dependent axial imbalance & constant magnetic field is analyzed. The axialvector-vector-vector (AVV) three-point function is studied using a real-time approach at finite temperature in the weak external field approximation. The chiral magnetic conductivity is given analytically for noninteracting fermions. It is pointed out that local charge conservation plays an important role when the axial imbalance is inhomogeneous. Proper regularization is needed which makes the constant axial imbalance limit delicate: for static but spatially oscillating chiral charge the current of the chiral magnetic effect (CME) vanishes. In the homogeneous (but possible time-dependent) limit of the axial imbalance the CME current is determined solely by the chiral anomaly. As a phenomenological consequence, the observability of the charge asymmetry caused by the CME turns out to be a matter of interplay between various scales of the system. Possible plasma instabilities resulting from the gradient corrections to the CME current are also pointed out.
|
hep-ph/9808349
|
Antal Jakovac
|
A. Jakovac
|
Viscosity of the Scalar Fields from the Classical Theory
|
11 pages, LaTeX, 1 eps figure
|
Phys.Lett. B446 (1999) 203-208
|
10.1016/S0370-2693(98)01496-8
| null |
hep-ph
| null |
We show how the resummation for time dependent quantities at high temperature
can be performed with an effective classical theory. As an application we
demonstrate that the leading term in the shear viscosity, which is related to
the $\rho_{\Phi^2\Phi^2}$ spectral function can be calculated classically,
either using classical linear response theory or from the classical $\Phi^2$
correlation function. The classical result depends explicitly on the cutoff,
and the choice $\Lambda\sim T$ reproduces the known quantum result.
|
[
{
"created": "Tue, 18 Aug 1998 08:52:52 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Jakovac",
"A.",
""
]
] |
We show how the resummation for time dependent quantities at high temperature can be performed with an effective classical theory. As an application we demonstrate that the leading term in the shear viscosity, which is related to the $\rho_{\Phi^2\Phi^2}$ spectral function can be calculated classically, either using classical linear response theory or from the classical $\Phi^2$ correlation function. The classical result depends explicitly on the cutoff, and the choice $\Lambda\sim T$ reproduces the known quantum result.
|
hep-ph/0603160
|
Ghela Devidze G
|
Ikaros I. Bigi (Notre Dame U.), George Chiladze (Tbilisi State U.),
Gela Devidze (Tbilisi State U.), Christoph Hanhart (Julich,
Forschungszentrum), Akaki Lipartelian (Tbilisi State U.), Ulf-G. Meissner
(Bonn U., HISK & Julich, Forschungszentrum)
|
Charged Lepton Radiative and B-meson Double Radiative Decays in Models
with Universal Extra Dimensions
|
15 pages, 2 figures, to appear in the Annual report of Tbilisi State
University
| null | null |
UND-HEP-06-BIG01
|
hep-ph
| null |
This paper addresses the role of Large Extra Dimensions in some flavor
changing neutral current (FCNC) driven processes. In particular we have
investigated radiative decays of charged leptons within models with only one
universal extra dimension (UED). Loop contributions with internal fermions and
scalars of comparable mass would seem to yield sizeable amplitudes, since the
generic quadratic suppression factor is changed into a linear one. Such
scenarios can in principle be realized in models with universal extra space
dimensions. Yet our calculations of the Kaluza-Klein (KK) contributions to
these radiative decays show this expected relative enhancement to disappear due
to the near mass degeneracy of the heavy neutrinos from the different
generations. In this paper we estimate also the UED contribution to the
$B_{s,d}\to\gamma\gamma$ rate and find an enhancement of 3% and 6%,
respectively, over the SM prediction.
|
[
{
"created": "Tue, 21 Mar 2006 14:42:30 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Bigi",
"Ikaros I.",
"",
"Notre Dame U."
],
[
"Chiladze",
"George",
"",
"Tbilisi State U."
],
[
"Devidze",
"Gela",
"",
"Tbilisi State U."
],
[
"Hanhart",
"Christoph",
"",
"Julich,\n Forschungszentrum"
],
[
"Lipartelian",
"Akaki",
"",
"Tbilisi State U."
],
[
"Meissner",
"Ulf-G.",
"",
"Bonn U., HISK & Julich, Forschungszentrum"
]
] |
This paper addresses the role of Large Extra Dimensions in some flavor changing neutral current (FCNC) driven processes. In particular we have investigated radiative decays of charged leptons within models with only one universal extra dimension (UED). Loop contributions with internal fermions and scalars of comparable mass would seem to yield sizeable amplitudes, since the generic quadratic suppression factor is changed into a linear one. Such scenarios can in principle be realized in models with universal extra space dimensions. Yet our calculations of the Kaluza-Klein (KK) contributions to these radiative decays show this expected relative enhancement to disappear due to the near mass degeneracy of the heavy neutrinos from the different generations. In this paper we estimate also the UED contribution to the $B_{s,d}\to\gamma\gamma$ rate and find an enhancement of 3% and 6%, respectively, over the SM prediction.
|
hep-ph/9507254
| null |
D.V.Antonov, Yu.A.Simonov (ITEP, Moscow)
|
Exact equations for vacuum correlators in field theory
|
9 pages
|
Phys.Atom.Nucl. 60 (1997) 478-489; Yad.Fiz. 60N3 (1997) 553-564
| null | null |
hep-ph
| null |
Stochastic quantization is used to derive exact equations, connecting
multilocal field correlators in the phi^3 theory and gluodynamics. Perturbative
expansion of the obtained equations in the lowest orders is presented.
|
[
{
"created": "Fri, 7 Jul 1995 09:58:22 GMT",
"version": "v1"
}
] |
2019-08-17
|
[
[
"Antonov",
"D. V.",
"",
"ITEP, Moscow"
],
[
"Simonov",
"Yu. A.",
"",
"ITEP, Moscow"
]
] |
Stochastic quantization is used to derive exact equations, connecting multilocal field correlators in the phi^3 theory and gluodynamics. Perturbative expansion of the obtained equations in the lowest orders is presented.
|
hep-ph/9211336
| null |
Pankaj Jain and John P. Ralston
|
Interpretation of the Color Transparency Experiments
|
to be published in the proceedings of the DPF92 meeting, Fermilab,
1992, 4 pages, 2 figures (not included, available upon request), report #
KUHEP-21
| null | null | null |
hep-ph
| null |
We argue that the experimentally measured color transparency ratio is
directly related to the interacting hadron wave function at small transverse
separation, $b^2<1/Q^2$. We show that the present experimental data is
consistent with pure scaling behavior of the hadron-hadron and lepton-hadron
scattering inside the nuclear medium.
|
[
{
"created": "Tue, 1 Dec 1992 03:29:33 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Jain",
"Pankaj",
""
],
[
"Ralston",
"John P.",
""
]
] |
We argue that the experimentally measured color transparency ratio is directly related to the interacting hadron wave function at small transverse separation, $b^2<1/Q^2$. We show that the present experimental data is consistent with pure scaling behavior of the hadron-hadron and lepton-hadron scattering inside the nuclear medium.
|
hep-ph/9405410
| null |
I.I. Bigi, M. Shifman, N.G. Uraltsev and A. Vainshtein
|
Sum Rules for Heavy Flavor Transitions in the SV Limit
|
72 pages, 5 figures (uuencoded ps files added using figures option),
Revised version. Paper is considerably extended to include some new results.
New section on quantum mechanical approach is added
|
Phys.Rev.D52:196-235,1995
|
10.1103/PhysRevD.52.196
|
CERN-TH.7250/94, TPI-MINN-94/12-T, UMN-TH-1250-94, UND-HEP-94-BIG05
|
hep-ph
| null |
We show how sum rules for the weak decays of heavy flavor hadrons can be
derived as the moments of spectral distributions in the small velocity (SV)
limit. This systematic approach allows us to determine corrections to these sum
rules, to obtain new sum rules and it provides us with a transparent physical
interpretation; it also opens a new perspective on the notion of the heavy
quark mass. Applying these sum rules we derive a lower bound on the deviation
of the exclusive form factor $F_{B->D^*}$ from unity at zero recoil; likewise
we give a field-theoretical derivation of a previously formulated inequality
between the expectation value for the kinetic energy operator of the heavy
quark and for the chromomagnetic operator. We analyze how the known results on
nonperturbative corrections must be understood when one takes into account the
normalization point dependence of the low scale parameters. Relation between
the field-theoretic derivation of the sum rules and the quantum-mechanical
approach is elucidated.
|
[
{
"created": "Mon, 30 May 1994 18:55:42 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Dec 1994 02:37:34 GMT",
"version": "v2"
}
] |
2010-11-01
|
[
[
"Bigi",
"I. I.",
""
],
[
"Shifman",
"M.",
""
],
[
"Uraltsev",
"N. G.",
""
],
[
"Vainshtein",
"A.",
""
]
] |
We show how sum rules for the weak decays of heavy flavor hadrons can be derived as the moments of spectral distributions in the small velocity (SV) limit. This systematic approach allows us to determine corrections to these sum rules, to obtain new sum rules and it provides us with a transparent physical interpretation; it also opens a new perspective on the notion of the heavy quark mass. Applying these sum rules we derive a lower bound on the deviation of the exclusive form factor $F_{B->D^*}$ from unity at zero recoil; likewise we give a field-theoretical derivation of a previously formulated inequality between the expectation value for the kinetic energy operator of the heavy quark and for the chromomagnetic operator. We analyze how the known results on nonperturbative corrections must be understood when one takes into account the normalization point dependence of the low scale parameters. Relation between the field-theoretic derivation of the sum rules and the quantum-mechanical approach is elucidated.
|
0708.3629
|
Sergey Bondarenko
|
S.Bondarenko, M.A.Braun
|
Boundary conditions in the QCD nucleus-nucleus scattering problem
|
19 pages, 8 figures
|
Nucl.Phys.A799:151-166,2008
|
10.1016/j.nuclphysa.2007.11.008
| null |
hep-ph hep-th
| null |
In the framework of the effective field theory for interacting BFKL pomerons,
applied to nucleus-nucleus scattering, boundary conditions for the classical
field equations are discussed. Correspondence with the QCD diagrams at the
boundary rapidities requires pomeron interaction with the participating nuclei
to be exponential and non-local. Commonly used 'eikonal' boundary conditions,
local and linear in fields, follow in the limit of small QCD pomeron-nucleon
coupling. Numerical solution of the classical field equations, which sum all
tree diagrams for central gold-gold scattering, demonstrates that corrected
boundary conditions lead to substantially different results, as compared to the
eikonal conditions studied in earlier publications. A breakdown of
projectile-target symmetry for particular solutions discovered earlier in
\cite{bom} is found to occur at roughly twice lower rapidity. Most important,
due to a high non-linearity of the problem, the found asymmetric solutions are
not unique but form a family growing in number with rapidity. The minimal value
for the action turns out to be much lower than with the eikonal boundary
conditions and saturates at rapidities around 10.
|
[
{
"created": "Mon, 27 Aug 2007 15:44:14 GMT",
"version": "v1"
}
] |
2012-03-27
|
[
[
"Bondarenko",
"S.",
""
],
[
"Braun",
"M. A.",
""
]
] |
In the framework of the effective field theory for interacting BFKL pomerons, applied to nucleus-nucleus scattering, boundary conditions for the classical field equations are discussed. Correspondence with the QCD diagrams at the boundary rapidities requires pomeron interaction with the participating nuclei to be exponential and non-local. Commonly used 'eikonal' boundary conditions, local and linear in fields, follow in the limit of small QCD pomeron-nucleon coupling. Numerical solution of the classical field equations, which sum all tree diagrams for central gold-gold scattering, demonstrates that corrected boundary conditions lead to substantially different results, as compared to the eikonal conditions studied in earlier publications. A breakdown of projectile-target symmetry for particular solutions discovered earlier in \cite{bom} is found to occur at roughly twice lower rapidity. Most important, due to a high non-linearity of the problem, the found asymmetric solutions are not unique but form a family growing in number with rapidity. The minimal value for the action turns out to be much lower than with the eikonal boundary conditions and saturates at rapidities around 10.
|
1411.3758
|
Christopher Verhaaren
|
Zackaria Chacko, Rashmish K. Mishra, Daniel Stolarski and Christopher
B. Verhaaren
|
Interactions of a Stabilized Radion and Duality
|
22 pages plus appendices and references
|
Phys. Rev. D 92, 056004 (2015)
|
10.1103/PhysRevD.92.056004
|
CERN-PH-TH-2014-225
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We determine the couplings of the graviscalar radion in Randall-Sundrum
models to Standard Model fields propagating in the bulk of the space, taking
into account effects arising from the dynamics of the Goldberger-Wise scalar
that stabilizes the size of the extra dimension. The leading corrections to the
radion couplings are shown to arise from direct contact interactions between
the Goldberger-Wise scalar and the Standard Model fields. We obtain a detailed
interpretation of the results in terms of the holographic dual of the radion,
the dilaton. In doing so, we determine how the familiar identification of the
parameters on the two sides of the AdS/CFT correspondence is modified in the
presence of couplings of the bulk Standard Model fields to the Goldberger-Wise
scalar. We find that corrections to the form of the dilaton couplings from
effects associated with the stabilization of the extra dimension are suppressed
by the square of the ratio of the dilaton mass to the Kaluza-Klein scale, in
good agreement with results from the CFT side of the correspondence.
|
[
{
"created": "Thu, 13 Nov 2014 22:19:48 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Sep 2015 20:00:30 GMT",
"version": "v2"
}
] |
2015-09-17
|
[
[
"Chacko",
"Zackaria",
""
],
[
"Mishra",
"Rashmish K.",
""
],
[
"Stolarski",
"Daniel",
""
],
[
"Verhaaren",
"Christopher B.",
""
]
] |
We determine the couplings of the graviscalar radion in Randall-Sundrum models to Standard Model fields propagating in the bulk of the space, taking into account effects arising from the dynamics of the Goldberger-Wise scalar that stabilizes the size of the extra dimension. The leading corrections to the radion couplings are shown to arise from direct contact interactions between the Goldberger-Wise scalar and the Standard Model fields. We obtain a detailed interpretation of the results in terms of the holographic dual of the radion, the dilaton. In doing so, we determine how the familiar identification of the parameters on the two sides of the AdS/CFT correspondence is modified in the presence of couplings of the bulk Standard Model fields to the Goldberger-Wise scalar. We find that corrections to the form of the dilaton couplings from effects associated with the stabilization of the extra dimension are suppressed by the square of the ratio of the dilaton mass to the Kaluza-Klein scale, in good agreement with results from the CFT side of the correspondence.
|
1008.3436
|
Kim Siyeon
|
Seungsu Hwang, Kim Siyeon
|
Quark Lepton Similarity
|
5 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose the lepton mixing matrix at high energy scale to be connected to
quark mixing matrix by the similar transformation. The similarity between CKM
and PMNS significantly narrows down the ranges in physical parameters. The
condition requires $\sin\theta_{13}$ not to be larger than 0.15, masses to be
of quasi-degenerate normal ordering, and $\tan\beta$ to be large.
|
[
{
"created": "Fri, 20 Aug 2010 04:51:09 GMT",
"version": "v1"
}
] |
2010-08-23
|
[
[
"Hwang",
"Seungsu",
""
],
[
"Siyeon",
"Kim",
""
]
] |
We propose the lepton mixing matrix at high energy scale to be connected to quark mixing matrix by the similar transformation. The similarity between CKM and PMNS significantly narrows down the ranges in physical parameters. The condition requires $\sin\theta_{13}$ not to be larger than 0.15, masses to be of quasi-degenerate normal ordering, and $\tan\beta$ to be large.
|
hep-ph/0509226
|
Peter Arnold
|
Peter Arnold and Guy D. Moore
|
The turbulent spectrum created by non-Abelian plasma instabilities
|
17 pages, 5 figures
|
Phys.Rev.D73:025013,2006
|
10.1103/PhysRevD.73.025013
| null |
hep-ph nucl-th
| null |
Recent numerical work on the fate of plasma instabilities in weakly-coupled
non-Abelian gauge theory has shown the development of a cascade of energy from
long to short wavelengths. This cascade has a steady-state spectrum, analogous
to the Kolmogorov spectrum for turbulence in hydrodynamics or for energy
cascades in other systems. In this paper, we theoretically analyze processes
responsible for this cascade and find a steady-state spectrum f_k ~ k^-2, where
f_k is the phase-space density of particles with momentum k. The exponent -2 is
consistent with results from numerical simulations. We also discuss
implications of the emerging picture of instability development on the
"bottom-up" thermalization scenario for (extremely high energy) heavy ion
collisions, emphasizing fundamental questions that remain to be answered.
|
[
{
"created": "Thu, 22 Sep 2005 02:46:17 GMT",
"version": "v1"
}
] |
2010-02-16
|
[
[
"Arnold",
"Peter",
""
],
[
"Moore",
"Guy D.",
""
]
] |
Recent numerical work on the fate of plasma instabilities in weakly-coupled non-Abelian gauge theory has shown the development of a cascade of energy from long to short wavelengths. This cascade has a steady-state spectrum, analogous to the Kolmogorov spectrum for turbulence in hydrodynamics or for energy cascades in other systems. In this paper, we theoretically analyze processes responsible for this cascade and find a steady-state spectrum f_k ~ k^-2, where f_k is the phase-space density of particles with momentum k. The exponent -2 is consistent with results from numerical simulations. We also discuss implications of the emerging picture of instability development on the "bottom-up" thermalization scenario for (extremely high energy) heavy ion collisions, emphasizing fundamental questions that remain to be answered.
|
hep-ph/9812506
|
Pankaj Jain
|
Bijoy Kundu, Jim Samuelsson, Pankaj Jain and John P. Ralston
|
Perturbative Color Transparency in Electroproduction Experiments
|
16 pages LaTeX, 9 ps figures. Text extensively revised, references
added and all the figures modified with an improved calculation. Results
remain unchanged qualitatively
|
Phys.Rev. D62 (2000) 113009
|
10.1103/PhysRevD.62.113009
| null |
hep-ph nucl-ex nucl-th
| null |
We calculate quasi-exclusive scattering of a virtual photon and a proton or
pion in nuclear targets. This is the first complete calculation of ``color
transparency" and "nuclear filtering " in perturbative QCD. The calculation
includes full integrations over hard interaction kernels and distribution
amplitudes in Feynman -x fractions and transverse spatial separation space $b$.
Sudakov effects depending on $b$ and the momentum transfer $Q^2$ are included.
Attenuation of the hadronic states propagating through the medium is calculated
using an eikonal Glauber formalism. Nuclear correlations are included
explicitly. We find that the color transparency ratio is comparatively
insensitive to theoretical uncertainties inherent in perturbative formalism,
such as choice of infrared cutoff scales. However, the $Q^2$ dependence of the
transparency ratio is found to depend sensitively on the model of the
distribution amplitude, with endpoint-dominated models failing to be dominated
by short-distance. Color transparency experiments should provide an excellent
test of the underlying theoretical assumptions used in the pQCD calculations.
|
[
{
"created": "Mon, 28 Dec 1998 05:28:09 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Jul 2000 15:02:43 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Kundu",
"Bijoy",
""
],
[
"Samuelsson",
"Jim",
""
],
[
"Jain",
"Pankaj",
""
],
[
"Ralston",
"John P.",
""
]
] |
We calculate quasi-exclusive scattering of a virtual photon and a proton or pion in nuclear targets. This is the first complete calculation of ``color transparency" and "nuclear filtering " in perturbative QCD. The calculation includes full integrations over hard interaction kernels and distribution amplitudes in Feynman -x fractions and transverse spatial separation space $b$. Sudakov effects depending on $b$ and the momentum transfer $Q^2$ are included. Attenuation of the hadronic states propagating through the medium is calculated using an eikonal Glauber formalism. Nuclear correlations are included explicitly. We find that the color transparency ratio is comparatively insensitive to theoretical uncertainties inherent in perturbative formalism, such as choice of infrared cutoff scales. However, the $Q^2$ dependence of the transparency ratio is found to depend sensitively on the model of the distribution amplitude, with endpoint-dominated models failing to be dominated by short-distance. Color transparency experiments should provide an excellent test of the underlying theoretical assumptions used in the pQCD calculations.
|
0910.4347
|
Jonathan Gaunt
|
Jonathan R. Gaunt and W. James Stirling
|
Double Parton Distributions Incorporating Perturbative QCD Evolution and
Momentum and Quark Number Sum Rules
|
41 pages, 14 figures. dPDF grids and code can be found at
http://projects.hepforge.org/gsdpdf/ . v4: Removed eps files included by
mistake in previous version.
|
JHEP 1003:005,2010
|
10.1007/JHEP03(2010)005
|
Cavendish-HEP-09/20
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It is anticipated that hard double parton scatterings will occur frequently
in the collisions of the LHC, producing interesting signals and significant
backgrounds to certain single scattering processes. For double scattering
processes in which the same hard scale t = ln(Q^2) is involved in both
collisions, we require the double parton distributions (dPDFs)
D_h^{j_1j_2}(x_1,x_2;t) in order to make theoretical predictions of their rates
and properties. We describe the development of a new set of leading order dPDFs
that represents an improvement on approaches used previously. First, we derive
momentum and number sum rules that the dPDFs must satisfy. The fact that these
must be obeyed at any scale is used to construct improved dPDFs at the input
scale Q_0, for a particular choice of input scale (Q_0^2 = 1 GeV^2) and
corresponding single PDFs (the MSTW2008LO set). We then describe a novel
program which uses a direct x-space method to numerically integrate the LO
DGLAP equation for the dPDFs, and which may be used to evolve the input dPDFs
to any other scale. This program has been used along with the improved input
dPDFs to produce a set of publicly available dPDF grids covering the ranges
10^{-6}<x_1<1, 10^{-6}<x_2<1, and 1<Q^2<10^9 GeV^2.
|
[
{
"created": "Thu, 22 Oct 2009 18:58:34 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Oct 2009 18:06:59 GMT",
"version": "v2"
},
{
"created": "Thu, 18 Mar 2010 15:08:25 GMT",
"version": "v3"
},
{
"created": "Fri, 19 Mar 2010 11:14:38 GMT",
"version": "v4"
}
] |
2015-03-13
|
[
[
"Gaunt",
"Jonathan R.",
""
],
[
"Stirling",
"W. James",
""
]
] |
It is anticipated that hard double parton scatterings will occur frequently in the collisions of the LHC, producing interesting signals and significant backgrounds to certain single scattering processes. For double scattering processes in which the same hard scale t = ln(Q^2) is involved in both collisions, we require the double parton distributions (dPDFs) D_h^{j_1j_2}(x_1,x_2;t) in order to make theoretical predictions of their rates and properties. We describe the development of a new set of leading order dPDFs that represents an improvement on approaches used previously. First, we derive momentum and number sum rules that the dPDFs must satisfy. The fact that these must be obeyed at any scale is used to construct improved dPDFs at the input scale Q_0, for a particular choice of input scale (Q_0^2 = 1 GeV^2) and corresponding single PDFs (the MSTW2008LO set). We then describe a novel program which uses a direct x-space method to numerically integrate the LO DGLAP equation for the dPDFs, and which may be used to evolve the input dPDFs to any other scale. This program has been used along with the improved input dPDFs to produce a set of publicly available dPDF grids covering the ranges 10^{-6}<x_1<1, 10^{-6}<x_2<1, and 1<Q^2<10^9 GeV^2.
|
1410.3930
|
Xiang Liu
|
Bo Wang, Cheng-Qun Pang, Xiang Liu and Takayuki Matsuki
|
Pseudotensor meson family
|
15 pages, 15 figures, and 7 tables. Accepted by PRD
|
Phys. Rev. D 91, 014025 (2015)
|
10.1103/PhysRevD.91.014025
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The pseudoscalar tensor states, $\pi_2$, $\eta_2$, and $K_2$, are
systematically studied through the Okubo-Zweig-Iizuka- allowed two-body strong
decays, including both the observed states reported by the Particle Data Group
and the predicted states. Phenomenological analysis combined with the
experimental data not only can test the assignments to these discussed states,
but it can also predict more abundant information {on} their partial decay
widths, which is helpful in the experimental study of these observed and
predicted pseudotensor states.
|
[
{
"created": "Wed, 15 Oct 2014 05:11:56 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Dec 2014 02:18:05 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Jan 2015 14:58:10 GMT",
"version": "v3"
}
] |
2015-01-26
|
[
[
"Wang",
"Bo",
""
],
[
"Pang",
"Cheng-Qun",
""
],
[
"Liu",
"Xiang",
""
],
[
"Matsuki",
"Takayuki",
""
]
] |
The pseudoscalar tensor states, $\pi_2$, $\eta_2$, and $K_2$, are systematically studied through the Okubo-Zweig-Iizuka- allowed two-body strong decays, including both the observed states reported by the Particle Data Group and the predicted states. Phenomenological analysis combined with the experimental data not only can test the assignments to these discussed states, but it can also predict more abundant information {on} their partial decay widths, which is helpful in the experimental study of these observed and predicted pseudotensor states.
|
hep-ph/9210228
|
Maekawa
|
Masako Bando, Taichiro Kugo, Nobuhiro Maekawa and Hiroaki Nakano
|
Improving the Effective Potential
|
13pages, no Figures, phyzzx.tex
|
Phys.Lett. B301 (1993) 83-89
|
10.1016/0370-2693(93)90725-W
|
KUNS1161
|
hep-ph
| null |
A general procedure is presented how to improve the effective potential by
using the renormalization group equation (RGE) in MS bar scheme. If one knows
the L-loop effective potential and the RGE coefficient functions up to
(L+1)-loop level, this procedure gives an improved potential which satisfies
the RGE and contains all of the leading, next-to-leading,... , and
L-th-to-leading log terms.
|
[
{
"created": "Mon, 12 Oct 1992 08:12:28 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Bando",
"Masako",
""
],
[
"Kugo",
"Taichiro",
""
],
[
"Maekawa",
"Nobuhiro",
""
],
[
"Nakano",
"Hiroaki",
""
]
] |
A general procedure is presented how to improve the effective potential by using the renormalization group equation (RGE) in MS bar scheme. If one knows the L-loop effective potential and the RGE coefficient functions up to (L+1)-loop level, this procedure gives an improved potential which satisfies the RGE and contains all of the leading, next-to-leading,... , and L-th-to-leading log terms.
|
hep-ph/9905532
|
Michel Tytgat
|
Ken Kiers and Michel H.G. Tytgat
|
Energetics of neutrinos in neutron stars
|
Latex + moriond.sty, 6 pages, 4 figures. Talk given by M.T. at the
XXXIVnd Rencontres de Moriond: Electroweak Interactions and Unified Theories
| null | null | null |
hep-ph
| null |
I review our proof that long range forces induced by the exchange of massless
neutrino-antineutrino pairs do not affect the stability of neutron stars.
|
[
{
"created": "Fri, 28 May 1999 08:48:37 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kiers",
"Ken",
""
],
[
"Tytgat",
"Michel H. G.",
""
]
] |
I review our proof that long range forces induced by the exchange of massless neutrino-antineutrino pairs do not affect the stability of neutron stars.
|
hep-ph/0611353
|
Alexander M\"uck
|
Stefan Dittmaier, Michael Kr\"amer, Alexander M\"uck, Tobias
Schl\"uter
|
MSSM Higgs-boson production in bottom-quark fusion: electroweak
radiative corrections
|
24 pages, 5 figures, LaTex, 1 figure added, reference added, version
published in JHEP
|
JHEP 0703:114,2007
|
10.1088/1126-6708/2007/03/114
|
MPP-2006-149, PITHA 06/11
|
hep-ph
| null |
Higgs-boson production in association with bottom quarks is an important
discovery channel for supersymmetric Higgs particles at hadron colliders for
large values of tan(beta). We present the complete O(alpha) electroweak and
O(alpha_s) strong corrections to associated bottom-Higgs production through bb
fusion in the MSSM and improve this next-to-leading-order prediction by known
two-loop contributions to the Higgs self-energies, as provided by the program
FeynHiggs. Choosing proper renormalization and input-parameter schemes, the
bulk of the corrections (in particular the leading terms for tan(beta)) can be
absorbed into an improved Born approximation. The remaining non-universal
corrections are typically of the order of a few per cent. Numerical results are
discussed for the benchmark scenarios SPS 1b and SPS 4.
|
[
{
"created": "Tue, 28 Nov 2006 15:23:53 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Jun 2007 08:21:32 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Dittmaier",
"Stefan",
""
],
[
"Krämer",
"Michael",
""
],
[
"Mück",
"Alexander",
""
],
[
"Schlüter",
"Tobias",
""
]
] |
Higgs-boson production in association with bottom quarks is an important discovery channel for supersymmetric Higgs particles at hadron colliders for large values of tan(beta). We present the complete O(alpha) electroweak and O(alpha_s) strong corrections to associated bottom-Higgs production through bb fusion in the MSSM and improve this next-to-leading-order prediction by known two-loop contributions to the Higgs self-energies, as provided by the program FeynHiggs. Choosing proper renormalization and input-parameter schemes, the bulk of the corrections (in particular the leading terms for tan(beta)) can be absorbed into an improved Born approximation. The remaining non-universal corrections are typically of the order of a few per cent. Numerical results are discussed for the benchmark scenarios SPS 1b and SPS 4.
|
2302.06948
|
Roldao da Rocha
|
G. B. de Gracia, A. A. Nogueira, R. da Rocha
|
Fermionic dark matter-photon quantum interaction: A mechanism for
darkness
|
42 pages, 6 figures
|
Nucl. Phys. B 992 (2023) 116227
|
10.1016/j.nuclphysb.2023.116227
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Mass dimension one fermionic fields are prime candidates to describe dark
matter, due to their intrinsic neutral nature, as they are constructed as
eigenstates of the charge conjugation operator with dual helicity. To formulate
the meaning of the darkness, the fermion-photon coupling is scrutinized with a
Pauli-like interaction, and the path integral is then formulated from the phase
space constraint structure. Ward-Takahashi-like identities and Schwinger-Dyson
equations, together with renormalizability, are employed to investigate a
phenomenological mechanism to avoid external light signals. Accordingly, the
non-polarized pair annihilation and Compton-like processes are shown to vanish
at the limit of small scattering angles even if considering 1-loop radiative
corrections, reinforcing the dark matter interpretation. However, dark matter
interactions with nucleons are still possible. Motivated by recent
nucleon-recoil experiments to detect dark matter, we furnish a consistent
theoretical setup to describe interaction with the photon compatible with the
prevalence of darkness.
|
[
{
"created": "Tue, 14 Feb 2023 10:07:32 GMT",
"version": "v1"
},
{
"created": "Tue, 16 May 2023 17:18:04 GMT",
"version": "v2"
}
] |
2023-05-17
|
[
[
"de Gracia",
"G. B.",
""
],
[
"Nogueira",
"A. A.",
""
],
[
"da Rocha",
"R.",
""
]
] |
Mass dimension one fermionic fields are prime candidates to describe dark matter, due to their intrinsic neutral nature, as they are constructed as eigenstates of the charge conjugation operator with dual helicity. To formulate the meaning of the darkness, the fermion-photon coupling is scrutinized with a Pauli-like interaction, and the path integral is then formulated from the phase space constraint structure. Ward-Takahashi-like identities and Schwinger-Dyson equations, together with renormalizability, are employed to investigate a phenomenological mechanism to avoid external light signals. Accordingly, the non-polarized pair annihilation and Compton-like processes are shown to vanish at the limit of small scattering angles even if considering 1-loop radiative corrections, reinforcing the dark matter interpretation. However, dark matter interactions with nucleons are still possible. Motivated by recent nucleon-recoil experiments to detect dark matter, we furnish a consistent theoretical setup to describe interaction with the photon compatible with the prevalence of darkness.
|
hep-ph/0306137
|
Carlo Ewerz
|
Carlo Ewerz
|
The Odderon in Quantum Chromodynamics
|
151 pages, 47 figures; v2: notation improved (latex problem fixed)
| null | null |
HD-THEP-02-35
|
hep-ph
| null |
The Odderon is the leading exchange in hadronic scattering processes at high
energies in which negative charge conjugation and parity quantum numbers are
transferred in the t-channel. We review the origin of the Odderon in Regge
theory, its status in perturbative and nonperturbative Quantum Chromodynamics,
as well as its phenomenology.
|
[
{
"created": "Mon, 16 Jun 2003 15:16:58 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jun 2003 16:51:45 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Ewerz",
"Carlo",
""
]
] |
The Odderon is the leading exchange in hadronic scattering processes at high energies in which negative charge conjugation and parity quantum numbers are transferred in the t-channel. We review the origin of the Odderon in Regge theory, its status in perturbative and nonperturbative Quantum Chromodynamics, as well as its phenomenology.
|
0711.1625
|
Mark Strikman
|
Mark Strikman
|
Color transparency: 33 years and still running
|
10 pages, To appear in the proceedings of Workshop on Exclusive
Reactions at High Momentum Transfer, Newport News, Virgina, 21-24 May 2007;
several references added
| null |
10.1142/9789812796950_0008
| null |
hep-ph
| null |
I review history of the color transparency (CT) which started with discovery
of the $J/\psi$ meson, discovery of high energy CT phenomena and the recent
progress in the investigations of CT at intermediate energies.
|
[
{
"created": "Sat, 10 Nov 2007 22:56:32 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jan 2008 03:13:50 GMT",
"version": "v2"
}
] |
2017-08-23
|
[
[
"Strikman",
"Mark",
""
]
] |
I review history of the color transparency (CT) which started with discovery of the $J/\psi$ meson, discovery of high energy CT phenomena and the recent progress in the investigations of CT at intermediate energies.
|
hep-ph/9906235
|
Xuan-Yem Pham
|
Q. Ho-Kim & X. Y. Pham
|
One-loop flavor changing electromagnetic transitions
|
LaTeX 16 pages + 4 postscript figures. Misprints corrected, some
Comments added
|
Phys. Rev. D 61, 013008 (1999)
|
10.1103/PhysRevD.61.013008
|
PAR-LPTHE/99-22
|
hep-ph
| null |
We discuss the effect of the external fermion masses in the flavor-changing
radiative transitions of a heavy fermion (quark or lepton) to a lighter fermion
at the one-loop level, and point out an often overlooked crucial difference in
the sign of a charge factor between transitions of the down type $s\to d\gamma$
and the up type $c\to u\gamma$. We give formulas for the $F\to f\gamma$
effective vertex in various approximations and the exact formula for $t\to
c\gamma$ and $\tau \to \mu \gamma$.
|
[
{
"created": "Thu, 3 Jun 1999 15:00:23 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jun 1999 13:52:59 GMT",
"version": "v2"
}
] |
2016-08-25
|
[
[
"Ho-Kim",
"Q.",
""
],
[
"Pham",
"X. Y.",
""
]
] |
We discuss the effect of the external fermion masses in the flavor-changing radiative transitions of a heavy fermion (quark or lepton) to a lighter fermion at the one-loop level, and point out an often overlooked crucial difference in the sign of a charge factor between transitions of the down type $s\to d\gamma$ and the up type $c\to u\gamma$. We give formulas for the $F\to f\gamma$ effective vertex in various approximations and the exact formula for $t\to c\gamma$ and $\tau \to \mu \gamma$.
|
hep-ph/9412235
|
Bonnie Friedman
|
Hanxin He and Xiangdong Ji
|
The Nucleon's Tensor Charge
|
8 pages, ReVTeX
|
Phys.Rev. D52 (1995) 2960-2963
|
10.1103/PhysRevD.52.2960
|
MIT-CTP-2380
|
hep-ph
| null |
We seek to understand the physical significance of the nucleon's tensor
charge and make estimates of its size in phenomenological models and the QCD
sum rule.
|
[
{
"created": "Mon, 5 Dec 1994 17:59:36 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"He",
"Hanxin",
""
],
[
"Ji",
"Xiangdong",
""
]
] |
We seek to understand the physical significance of the nucleon's tensor charge and make estimates of its size in phenomenological models and the QCD sum rule.
|
1708.00008
|
Rhorry Gauld
|
R. Gauld, A. Gehrmann-De Ridder, T. Gehrmann, E.W.N. Glover, A. Huss
|
Precise predictions for the angular coefficients in Z-boson production
at the LHC
|
21 pages + refs, 13 figures. v2 reflects published JHEP version.
Includes the evaluation of uncorrelated scale uncertainties when computing
the angular coefficients. Plots and text updated accordingly
| null |
10.1007/JHEP11(2017)003
|
IPPP/17/58, ZU-TH 21/17
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The angular distributions of lepton pairs in the Drell-Yan process can
provide rich information on the underlying QCD production mechanisms. These
dynamics can be parameterised in terms of a set of frame dependent angular
coefficients, $A_{i=0,\ldots,7}$, which depend on the invariant mass,
transverse momentum, and rapidity of the lepton pair. Motivated by recent
measurements of these coefficients by ATLAS and CMS, and in particular by the
apparent violation of the Lam-Tung relation $A_0-A_2=0$, we perform a precision
study of the angular coefficients at $\mathcal{O}(\alpha_s^3)$ in perturbative
QCD. We make predictions relevant for $pp$ collisions at $\sqrt{s} = 8$ TeV,
and perform comparisons with the available ATLAS and CMS data as well as
providing predictions for a prospective measurement at LHCb. To expose the
violation of the Lam-Tung relationship we propose a new observable
$\Delta^\mathrm{LT} = 1-A_2/A_0$ that is more sensitive to the dynamics in the
region where $A_0$ and $A_2$ are both small. We find that the
$\mathcal{O}(\alpha_s^3)$ corrections have an important impact on the $p_{T,Z}$
distributions for several of the angular coefficients, and are essential to
provide an adequate description of the data. The compatibility of the available
ATLAS and CMS data is reassessed by performing a partial $\chi^2$ test with
respect to the central theoretical prediction which shows that
$\chi^2/N_\mathrm{data}$ is significantly reduced by going from
$\mathcal{O}(\alpha_s^2)$ to $\mathcal{O}(\alpha_s^3)$.
|
[
{
"created": "Mon, 31 Jul 2017 18:00:02 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Nov 2017 08:19:40 GMT",
"version": "v2"
}
] |
2017-12-06
|
[
[
"Gauld",
"R.",
""
],
[
"Ridder",
"A. Gehrmann-De",
""
],
[
"Gehrmann",
"T.",
""
],
[
"Glover",
"E. W. N.",
""
],
[
"Huss",
"A.",
""
]
] |
The angular distributions of lepton pairs in the Drell-Yan process can provide rich information on the underlying QCD production mechanisms. These dynamics can be parameterised in terms of a set of frame dependent angular coefficients, $A_{i=0,\ldots,7}$, which depend on the invariant mass, transverse momentum, and rapidity of the lepton pair. Motivated by recent measurements of these coefficients by ATLAS and CMS, and in particular by the apparent violation of the Lam-Tung relation $A_0-A_2=0$, we perform a precision study of the angular coefficients at $\mathcal{O}(\alpha_s^3)$ in perturbative QCD. We make predictions relevant for $pp$ collisions at $\sqrt{s} = 8$ TeV, and perform comparisons with the available ATLAS and CMS data as well as providing predictions for a prospective measurement at LHCb. To expose the violation of the Lam-Tung relationship we propose a new observable $\Delta^\mathrm{LT} = 1-A_2/A_0$ that is more sensitive to the dynamics in the region where $A_0$ and $A_2$ are both small. We find that the $\mathcal{O}(\alpha_s^3)$ corrections have an important impact on the $p_{T,Z}$ distributions for several of the angular coefficients, and are essential to provide an adequate description of the data. The compatibility of the available ATLAS and CMS data is reassessed by performing a partial $\chi^2$ test with respect to the central theoretical prediction which shows that $\chi^2/N_\mathrm{data}$ is significantly reduced by going from $\mathcal{O}(\alpha_s^2)$ to $\mathcal{O}(\alpha_s^3)$.
|
2402.15144
|
Liangliang Su
|
Ningqiang Song, Liangliang Su, and Lei Wu
|
Polarization Signals from Axion-Photon Resonant Conversion in Neutron
Star Magnetosphere
|
7+5 pages, 2+2 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Neutron stars provide ideal astrophysical laboratories for probing new
physics beyond the Standard Model. If axions exist, photons can develop linear
polarization during photon-axion conversion in the magnetic field of a neutron
star. We find that the plasma in the neutron star magnetosphere could
dramatically enhance the polarization through the resonant conversion effect.
With the polarization measurements from PSR B0531+21, PSR B0656+14, and 4U
0142+61, we derive new strong constraints on the axion-photon coupling in a
broad axion mass range $10^{-11}\lesssim m_a \lesssim 10^{-3}$ eV.
|
[
{
"created": "Fri, 23 Feb 2024 07:00:40 GMT",
"version": "v1"
}
] |
2024-02-26
|
[
[
"Song",
"Ningqiang",
""
],
[
"Su",
"Liangliang",
""
],
[
"Wu",
"Lei",
""
]
] |
Neutron stars provide ideal astrophysical laboratories for probing new physics beyond the Standard Model. If axions exist, photons can develop linear polarization during photon-axion conversion in the magnetic field of a neutron star. We find that the plasma in the neutron star magnetosphere could dramatically enhance the polarization through the resonant conversion effect. With the polarization measurements from PSR B0531+21, PSR B0656+14, and 4U 0142+61, we derive new strong constraints on the axion-photon coupling in a broad axion mass range $10^{-11}\lesssim m_a \lesssim 10^{-3}$ eV.
|
2210.12014
|
Ignacio Borsa Sanjuan
|
Ignacio Borsa, Daniel de Florian, Iv\'an Pedron
|
The full set of Polarized Deep Inelastic Scattering Structure Functions
at NNLO accuracy
| null | null |
10.1140/epjc/s10052-022-11140-z
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We present the second order contributions to the coefficient functions for
the parity violating polarized structure functions $g_L$ and $g_4$, thus
completing the $\mathcal{O}(\alpha_S^2)$ knowledge on DIS structure functions.
We obtain the missing $\mathcal{O}(\alpha_S^2)$ pieces from the known parity
conserving unpolarized coefficient functions. We also present a
phenomenological analysis for the phase space region the future Electron-Ion
Collider is set to explore.
|
[
{
"created": "Fri, 21 Oct 2022 14:59:26 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Dec 2022 14:42:45 GMT",
"version": "v2"
}
] |
2023-01-18
|
[
[
"Borsa",
"Ignacio",
""
],
[
"de Florian",
"Daniel",
""
],
[
"Pedron",
"Iván",
""
]
] |
We present the second order contributions to the coefficient functions for the parity violating polarized structure functions $g_L$ and $g_4$, thus completing the $\mathcal{O}(\alpha_S^2)$ knowledge on DIS structure functions. We obtain the missing $\mathcal{O}(\alpha_S^2)$ pieces from the known parity conserving unpolarized coefficient functions. We also present a phenomenological analysis for the phase space region the future Electron-Ion Collider is set to explore.
|
2007.15655
|
Nirmal Raj
|
Graham D. Kribs, David McKeen, Nirmal Raj
|
Breaking up the Proton: An Affair with Dark Forces
|
5 pages revtex4 + references, 3 figures
|
Phys. Rev. Lett. 126, 011801 (2021)
|
10.1103/PhysRevLett.126.011801
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Deep inelastic scattering of $e^{\pm}$ off protons is sensitive to
contributions from "dark photon" exchange. Using HERA data fit to HERA's parton
distribution functions, we obtain the model-independent bound $\epsilon
\lesssim 0.02$ on the kinetic mixing between hypercharge and the dark photon
for dark photon masses $\lesssim 10$ GeV. This slightly improves on the bound
obtained from electroweak precision observables. For higher masses the limit
weakens monotonically; $\epsilon \lesssim 1$ for a dark photon mass of $5$ TeV.
Utilizing PDF sum rules, we demonstrate that the effects of the dark photon
cannot be (trivially) absorbed into re-fit PDFs, and in fact lead to non-DGLAP
(Bjorken $x_{\rm B}$-independent) scaling violations that could provide a
smoking gun in data. The proposed $e^\pm p$ collider operating at $\sqrt{s} =
1.3$ TeV, LHeC, is anticipated to accumulate $10^3$ times the luminosity of
HERA, providing substantial improvements in probing the effects of a dark
photon: sensitivity to $\epsilon$ well below that probed by electroweak
precision data is possible throughout virtually the entire dark photon mass
range, as well as being able to probe to much higher dark photon masses, up to
$100$ TeV.
|
[
{
"created": "Thu, 30 Jul 2020 18:00:00 GMT",
"version": "v1"
}
] |
2021-01-13
|
[
[
"Kribs",
"Graham D.",
""
],
[
"McKeen",
"David",
""
],
[
"Raj",
"Nirmal",
""
]
] |
Deep inelastic scattering of $e^{\pm}$ off protons is sensitive to contributions from "dark photon" exchange. Using HERA data fit to HERA's parton distribution functions, we obtain the model-independent bound $\epsilon \lesssim 0.02$ on the kinetic mixing between hypercharge and the dark photon for dark photon masses $\lesssim 10$ GeV. This slightly improves on the bound obtained from electroweak precision observables. For higher masses the limit weakens monotonically; $\epsilon \lesssim 1$ for a dark photon mass of $5$ TeV. Utilizing PDF sum rules, we demonstrate that the effects of the dark photon cannot be (trivially) absorbed into re-fit PDFs, and in fact lead to non-DGLAP (Bjorken $x_{\rm B}$-independent) scaling violations that could provide a smoking gun in data. The proposed $e^\pm p$ collider operating at $\sqrt{s} = 1.3$ TeV, LHeC, is anticipated to accumulate $10^3$ times the luminosity of HERA, providing substantial improvements in probing the effects of a dark photon: sensitivity to $\epsilon$ well below that probed by electroweak precision data is possible throughout virtually the entire dark photon mass range, as well as being able to probe to much higher dark photon masses, up to $100$ TeV.
|
hep-ph/9704378
|
Gerhard Schuler
|
Jan Bolz, Peter Kroll, Gerhard A. Schuler
|
Higher Fock states and power counting in exclusive P-wave quarkonium
decays
|
Latex, 25 pages, 5 figures
|
Eur.Phys.J.C2:705-719,1998
|
10.1007/s100520050174
|
CERN-TH/97-64
|
hep-ph
| null |
Exclusive processes at large momentum transfer Q factor into perturbatively
calculable short-distance parts and long-distance hadronic wave functions.
Usually, only contributions from the leading Fock states have to be included to
leading order in 1/Q. We show that for exclusive decays of P-wave quarkonia the
contribution from the next-higher Fock state |Q Qbar g> contributes at the same
order in 1/Q. We investigate how the constituent gluon attaches to the hard
process in order to form colour-singlet final-state hadrons and argue that a
single additional long-distance factor is sufficient to parametrize the size of
its contribution. Incorporating transverse degrees of freedom and Sudakov
factors, our results are perturbatively stable in the sense that soft
phase-space contributions are largely suppressed. Explicit calculations yield
good agreement with data on chi_{c J} decays into pairs of pions, kaons, and
etas. We also comment on J/psi decays into two pions.
|
[
{
"created": "Tue, 22 Apr 1997 17:41:56 GMT",
"version": "v1"
}
] |
2009-08-25
|
[
[
"Bolz",
"Jan",
""
],
[
"Kroll",
"Peter",
""
],
[
"Schuler",
"Gerhard A.",
""
]
] |
Exclusive processes at large momentum transfer Q factor into perturbatively calculable short-distance parts and long-distance hadronic wave functions. Usually, only contributions from the leading Fock states have to be included to leading order in 1/Q. We show that for exclusive decays of P-wave quarkonia the contribution from the next-higher Fock state |Q Qbar g> contributes at the same order in 1/Q. We investigate how the constituent gluon attaches to the hard process in order to form colour-singlet final-state hadrons and argue that a single additional long-distance factor is sufficient to parametrize the size of its contribution. Incorporating transverse degrees of freedom and Sudakov factors, our results are perturbatively stable in the sense that soft phase-space contributions are largely suppressed. Explicit calculations yield good agreement with data on chi_{c J} decays into pairs of pions, kaons, and etas. We also comment on J/psi decays into two pions.
|
1711.11001
|
Tomas Husek
|
Tomas Husek, Karol Kampf, Stefan Leupold, Jiri Novotny
|
Radiative corrections to the $\eta^{(\prime)}$ Dalitz decays
|
30 pages, 8 figures, 12 tables; v2: hadronic vacuum polarization
contribution, spectral function fit and ancillary files containing data
points added, minor corrections; v3: accepted version for publication in
Phys. Rev. D., extended results section and end of Section IV, corrected
values in Tables III-VI, Figs. 5a and 5b and ancillary files updated, other
minor corrections and improvemets
|
Phys. Rev. D 97, 096013 (2018)
|
10.1103/PhysRevD.97.096013
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We provide the complete set of radiative corrections to the Dalitz decays
$\eta^{(\prime)}\to \ell^+\ell^-\gamma$ beyond the soft-photon approximation,
i.e. over the whole range of the Dalitz plot and with no restrictions on the
energy of a radiative photon. The corrections inevitably depend on the
$\eta^{(\prime)}\to\gamma^*\gamma^{(*)}$ transition form factors. For the
singly virtual transition form factor appearing e.g. in the bremsstrahlung
correction, recent dispersive calculations are used. For the
one-photon-irreducible contribution at the one-loop level (for the doubly
virtual form factor), we use a vector-meson-dominance-inspired model while
taking into account the $\eta$-$\eta^\prime$ mixing.
|
[
{
"created": "Wed, 29 Nov 2017 18:23:57 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Jan 2018 18:58:28 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Jun 2018 09:43:06 GMT",
"version": "v3"
}
] |
2018-06-05
|
[
[
"Husek",
"Tomas",
""
],
[
"Kampf",
"Karol",
""
],
[
"Leupold",
"Stefan",
""
],
[
"Novotny",
"Jiri",
""
]
] |
We provide the complete set of radiative corrections to the Dalitz decays $\eta^{(\prime)}\to \ell^+\ell^-\gamma$ beyond the soft-photon approximation, i.e. over the whole range of the Dalitz plot and with no restrictions on the energy of a radiative photon. The corrections inevitably depend on the $\eta^{(\prime)}\to\gamma^*\gamma^{(*)}$ transition form factors. For the singly virtual transition form factor appearing e.g. in the bremsstrahlung correction, recent dispersive calculations are used. For the one-photon-irreducible contribution at the one-loop level (for the doubly virtual form factor), we use a vector-meson-dominance-inspired model while taking into account the $\eta$-$\eta^\prime$ mixing.
|
1301.2709
|
Ichiro Oda
|
Ichiro Oda
|
Classically Scale-invariant B-L Model and Dilaton Gravity
|
One section of one-loop effects is added. Version to appear in Phys.
Rev. D
| null |
10.1103/PhysRevD.87.065025
|
DPUR/TH/36
|
hep-ph gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a coupling of dilaton gravity to the classically scale-invariant
B-L extended standard model which has been recently proposed as a
phenomenologically viable model realizing the Coleman-Weinberg mechanism of
breakdown of the electroweak symmetry. It is shown in the present model that
without recourse to the Coleman-Weinberg mechanism, the B-L gauge symmetry is
broken in the process of spontaneous symmetry breakdown of scale invariance at
the tree level and as a result the B-L gauge field becomes massive via the
Higgs mechanism. Since the dimensionful parameter is only the Planck mass in
our model, one is forced to pick up very small coupling constants if one wishes
to realize the breaking of the B-L symmetry at TeV scale.
|
[
{
"created": "Sat, 12 Jan 2013 19:38:12 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Jan 2013 08:46:57 GMT",
"version": "v2"
},
{
"created": "Sat, 16 Mar 2013 09:42:13 GMT",
"version": "v3"
}
] |
2013-04-03
|
[
[
"Oda",
"Ichiro",
""
]
] |
We consider a coupling of dilaton gravity to the classically scale-invariant B-L extended standard model which has been recently proposed as a phenomenologically viable model realizing the Coleman-Weinberg mechanism of breakdown of the electroweak symmetry. It is shown in the present model that without recourse to the Coleman-Weinberg mechanism, the B-L gauge symmetry is broken in the process of spontaneous symmetry breakdown of scale invariance at the tree level and as a result the B-L gauge field becomes massive via the Higgs mechanism. Since the dimensionful parameter is only the Planck mass in our model, one is forced to pick up very small coupling constants if one wishes to realize the breaking of the B-L symmetry at TeV scale.
|
hep-ph/9904378
|
James Wells
|
Tony Gherghetta, Gian F. Giudice, and James D. Wells (CERN)
|
Phenomenological consequences of supersymmetry with anomaly-induced
masses
|
26 pages, 7 figures, LaTeX
|
Nucl.Phys. B559 (1999) 27-47
|
10.1016/S0550-3213(99)00429-0
|
CERN-TH/99-104
|
hep-ph
| null |
In the supersymmetric standard model there exist pure gravity contributions
to the soft mass parameters which arise via the superconformal anomaly. We
consider the low-energy phenomenology with a mass spectrum dominated by the
anomaly-induced contributions. In a well-defined minimal model we calculate
electroweak symmetry breaking parameters, scalar masses, and the full one-loop
splitting of the degenerate Wino states. The most distinctive features are
gaugino masses proportional to the corresponding gauge coupling beta-functions,
the possibility of a Wino as the lightest supersymmetric particle, mass
degeneracy of sleptons, and a very massive gravitino. Unique signatures at
high-energy colliders include dilepton and single lepton final states,
accompanied by missing energy and displaced vertices. We also point out that
this scenario has the cosmological advantage of ameliorating the gravitino
problem. Finally, the primordial gravitino decay can produce a relic density of
Wino particles close to the critical value.
|
[
{
"created": "Sun, 18 Apr 1999 12:16:33 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Apr 1999 15:01:07 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Gherghetta",
"Tony",
"",
"CERN"
],
[
"Giudice",
"Gian F.",
"",
"CERN"
],
[
"Wells",
"James D.",
"",
"CERN"
]
] |
In the supersymmetric standard model there exist pure gravity contributions to the soft mass parameters which arise via the superconformal anomaly. We consider the low-energy phenomenology with a mass spectrum dominated by the anomaly-induced contributions. In a well-defined minimal model we calculate electroweak symmetry breaking parameters, scalar masses, and the full one-loop splitting of the degenerate Wino states. The most distinctive features are gaugino masses proportional to the corresponding gauge coupling beta-functions, the possibility of a Wino as the lightest supersymmetric particle, mass degeneracy of sleptons, and a very massive gravitino. Unique signatures at high-energy colliders include dilepton and single lepton final states, accompanied by missing energy and displaced vertices. We also point out that this scenario has the cosmological advantage of ameliorating the gravitino problem. Finally, the primordial gravitino decay can produce a relic density of Wino particles close to the critical value.
|
hep-ph/9912418
|
S. Atag
|
S. Atag and I. T. Cakir
|
Anomalous WW-gamma Vertex at LC+HERA Based gamma-p Collider
|
6 pages including 2 eps figures
| null | null | null |
hep-ph
| null |
The potential of LC+HERA based gamma-p collider to probe WW-gamma vertex is
presented through the discussion of sensitivity to anomalous couplings and
p_{T} distribution of the final quark. The limits of -0.16<(kappa-1)<0.14,
-0.30<lambda<0.30, at 95% C.L. can be reached with integrated luminosity
100pb^{-1} and they are competitive to projected future limits from other
colliders. The results are compared with corresponding ep collider using
Weizsacker-Williams Approximation.
|
[
{
"created": "Mon, 20 Dec 1999 08:48:06 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Atag",
"S.",
""
],
[
"Cakir",
"I. T.",
""
]
] |
The potential of LC+HERA based gamma-p collider to probe WW-gamma vertex is presented through the discussion of sensitivity to anomalous couplings and p_{T} distribution of the final quark. The limits of -0.16<(kappa-1)<0.14, -0.30<lambda<0.30, at 95% C.L. can be reached with integrated luminosity 100pb^{-1} and they are competitive to projected future limits from other colliders. The results are compared with corresponding ep collider using Weizsacker-Williams Approximation.
|
hep-ph/9903405
|
Manayenkov Serguei
|
S. I. Manayenkov
|
Regge description of spin-spin asymmetry in photon diffractive
dissociation
|
44 pages, LaTeX, 12 figures
| null |
10.1007/s10582-000-0014-0
|
DESY 99--016
|
hep-ph
| null |
We explore the possibility whether the gluon helicity distribution $\Delta
G(x)$ can be extracted from a comparison of experimental data on the
longitudinal spin-spin asymmetry $A_{LL}$ in $\gamma p$ diffractive deep
inelastic scattering with calculations performed within the framework of
perturbative QCD (pQCD). The data could be obtained at the future HERA collider
in scattering of polarized electrons/positrons off polarized protons. In this
paper we look for such kinematical regions where contributions to $A_{LL}$ from
soft processes (reggeon exchanges) are suppressed to guarantee an applicability
of pQCD. It is shown that for the square of the center-of-mass energy
$s_{\gamma p} \geq 10^3 GeV^2$, the hadronic diffractive mass $M_X \leq 10
GeV/c^2$, the momentum transferred to the proton $\Delta_T\leq 0.5 GeV/c$, and
$Q^2\geq4 (GeV/c)^2$ the longitudinal spin-spin asymmetry due to reggeon
exchanges is less than 10^{-4}. This value is presumably lower than the
asymmetry which can be measured with modern experimental technique. This means
that the pQCD prediction can be reliably compared with data in this kinematical
region.
|
[
{
"created": "Thu, 18 Mar 1999 21:00:48 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Mar 1999 16:28:02 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Manayenkov",
"S. I.",
""
]
] |
We explore the possibility whether the gluon helicity distribution $\Delta G(x)$ can be extracted from a comparison of experimental data on the longitudinal spin-spin asymmetry $A_{LL}$ in $\gamma p$ diffractive deep inelastic scattering with calculations performed within the framework of perturbative QCD (pQCD). The data could be obtained at the future HERA collider in scattering of polarized electrons/positrons off polarized protons. In this paper we look for such kinematical regions where contributions to $A_{LL}$ from soft processes (reggeon exchanges) are suppressed to guarantee an applicability of pQCD. It is shown that for the square of the center-of-mass energy $s_{\gamma p} \geq 10^3 GeV^2$, the hadronic diffractive mass $M_X \leq 10 GeV/c^2$, the momentum transferred to the proton $\Delta_T\leq 0.5 GeV/c$, and $Q^2\geq4 (GeV/c)^2$ the longitudinal spin-spin asymmetry due to reggeon exchanges is less than 10^{-4}. This value is presumably lower than the asymmetry which can be measured with modern experimental technique. This means that the pQCD prediction can be reliably compared with data in this kinematical region.
|
hep-ph/0408320
|
Alessandro Strumia
|
Gian F. Giudice, Tilman Plehn, Alessandro Strumia
|
Graviton collider effects in one and more large extra dimensions
|
24 pages, 10 figures. v2: erratum added at the end of the paper
|
Nucl.Phys.B706:455-483,2005
|
10.1016/j.nuclphysb.2004.10.056
|
IFUP-Th/2004-18 and CERN-TH/2004-160
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Astrophysical bounds severely limit the possibility of observing collider
signals of gravity with less than 3 flat extra dimensions. However, small
distortions of the compactified space can lift the masses of the lightest
graviton excitations, evading astrophysical bounds without affecting collider
signals of quantum gravity. Following this procedure we reconsider theories
with one large extra dimension. A slight space warping gives a model which is
safe in the infrared against astrophysical and observational bounds, and which
has the ultraviolet properties of gravity with a single flat extra dimension.
We extend collider studies to the case of one extra dimension, pointing out its
peculiarities. Finally, for a generic number of extra dimensions, we compare
different channels in LHC searches for quantum gravity, introducing an
ultraviolet cutoff as an additional parameter besides the Planck mass.
|
[
{
"created": "Fri, 27 Aug 2004 17:03:00 GMT",
"version": "v1"
},
{
"created": "Fri, 20 May 2011 07:48:54 GMT",
"version": "v2"
}
] |
2011-05-23
|
[
[
"Giudice",
"Gian F.",
""
],
[
"Plehn",
"Tilman",
""
],
[
"Strumia",
"Alessandro",
""
]
] |
Astrophysical bounds severely limit the possibility of observing collider signals of gravity with less than 3 flat extra dimensions. However, small distortions of the compactified space can lift the masses of the lightest graviton excitations, evading astrophysical bounds without affecting collider signals of quantum gravity. Following this procedure we reconsider theories with one large extra dimension. A slight space warping gives a model which is safe in the infrared against astrophysical and observational bounds, and which has the ultraviolet properties of gravity with a single flat extra dimension. We extend collider studies to the case of one extra dimension, pointing out its peculiarities. Finally, for a generic number of extra dimensions, we compare different channels in LHC searches for quantum gravity, introducing an ultraviolet cutoff as an additional parameter besides the Planck mass.
|
2110.11944
|
Doojin Kim
|
Bhaskar Dutta, Doojin Kim, Adrian Thompson, Remington T. Thornton,
Richard G. Van de Water
|
Solutions to the MiniBooNE Anomaly from New Physics in Charged Meson
Decays
|
10 pages, 4 figures, 2 tables, Journal submission version
| null |
10.1103/PhysRevLett.129.111803
|
MI-HET-766, LA-UR-21-30532
|
hep-ph hep-ex
|
http://creativecommons.org/publicdomain/zero/1.0/
|
We point out that production of new bosons by charged meson decays can
greatly enhance the sensitivity of beam-focused accelerator-based experiments
to new physics signals. This enhancement arises since the charged mesons are
focused and their three-body decays do not suffer from helicity suppression in
the same way as their usual two-body decays. As a realistic application, we
attempt to explain the MiniBooNE low energy excess utilizing this overlooked
mechanism, uniquely realizing dark-sector interpretations as plausible
solutions to the excess. As proof of the principle, we consider two
well-motivated classes of dark-sector models, models of vector-portal dark
matter and models of long-lived (pseudo)scalar. We argue that the model
parameter values to accommodate the excess are consistent with existing limits
and that they can be tested at current and future accelerator-based neutrino
experiments.
|
[
{
"created": "Fri, 22 Oct 2021 17:56:12 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Dec 2021 18:49:20 GMT",
"version": "v2"
},
{
"created": "Sat, 13 Aug 2022 04:30:36 GMT",
"version": "v3"
}
] |
2022-09-21
|
[
[
"Dutta",
"Bhaskar",
""
],
[
"Kim",
"Doojin",
""
],
[
"Thompson",
"Adrian",
""
],
[
"Thornton",
"Remington T.",
""
],
[
"Van de Water",
"Richard G.",
""
]
] |
We point out that production of new bosons by charged meson decays can greatly enhance the sensitivity of beam-focused accelerator-based experiments to new physics signals. This enhancement arises since the charged mesons are focused and their three-body decays do not suffer from helicity suppression in the same way as their usual two-body decays. As a realistic application, we attempt to explain the MiniBooNE low energy excess utilizing this overlooked mechanism, uniquely realizing dark-sector interpretations as plausible solutions to the excess. As proof of the principle, we consider two well-motivated classes of dark-sector models, models of vector-portal dark matter and models of long-lived (pseudo)scalar. We argue that the model parameter values to accommodate the excess are consistent with existing limits and that they can be tested at current and future accelerator-based neutrino experiments.
|
2212.01229
|
Neetu Raj Singh Chundawat
|
Neetu Raj Singh Chundawat
|
New physics in $B \to K^* \tau^+ \tau^-$: A model independent analysis
|
14 pages, 6 figures; Published version
|
Phys. Rev. D 107, 055004 (2023)
|
10.1103/PhysRevD.107.055004
| null |
hep-ph
|
http://creativecommons.org/licenses/by-sa/4.0/
|
In this work we consider the implications of current $b \to s \ell^+ \ell^-$
($\ell=e,\,\mu$) measurements on several $B \to K^* \tau^+ \tau^-$ observables
under the assumption that the possible new physics can have both universal as
well as nonuniversal couplings to leptons. For new physics solutions which
provide a good fit to all $b \to s \ell^+ \ell^-$ data, we intend to identify
observables with large deviations from the Standard Model (SM) predictions as
well as to discriminate between various new physics solutions. For this we
consider the $B \to K^* \tau^+ \tau^-$ branching fraction, the $K^*$
longitudinal fraction $f_L$, the tau forward-backward asymmetry $A_{FB}$ and
the optimized observables in the $P_i^{(')}$ basis. Further, we construct the
$\tau - \mu$ lepton-flavor differences ($Q^{\tau\mu}$) between these tau
observables and their muonic counterparts in $B \to K^* \mu^+ \mu^-$ decay.
Moreover, we also consider lepton-flavor ratios ($R^{\tau\mu}$) of all of these
observables. We find that the current data allows for deviations ranging from
25% up to an order of magnitude from the SM value in a number of observables.
For e.g., the magnitudes of $Q^{\tau \mu}_{P_3}$ and $Q^{\tau \mu}_{P'_8}$
observables can be enhanced up to an order of magnitude, a twofold enhancement
in $Q^{\tau\mu}_{A_{FB}}$ is possible along with $\sim$50% enhancement in
$R^{\tau\mu}_{K^*}$ and $\sim$25% in $R^{\tau\mu}_{A_{FB}}$. Moreover, the
branching ratio of $B \to K^* \tau^+ \tau^-$ can be suppressed up to 25%. A
precise measurement of these observables can also discriminate between a number
of new physics solutions.
|
[
{
"created": "Wed, 30 Nov 2022 18:04:50 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Mar 2023 17:56:53 GMT",
"version": "v2"
}
] |
2023-03-07
|
[
[
"Chundawat",
"Neetu Raj Singh",
""
]
] |
In this work we consider the implications of current $b \to s \ell^+ \ell^-$ ($\ell=e,\,\mu$) measurements on several $B \to K^* \tau^+ \tau^-$ observables under the assumption that the possible new physics can have both universal as well as nonuniversal couplings to leptons. For new physics solutions which provide a good fit to all $b \to s \ell^+ \ell^-$ data, we intend to identify observables with large deviations from the Standard Model (SM) predictions as well as to discriminate between various new physics solutions. For this we consider the $B \to K^* \tau^+ \tau^-$ branching fraction, the $K^*$ longitudinal fraction $f_L$, the tau forward-backward asymmetry $A_{FB}$ and the optimized observables in the $P_i^{(')}$ basis. Further, we construct the $\tau - \mu$ lepton-flavor differences ($Q^{\tau\mu}$) between these tau observables and their muonic counterparts in $B \to K^* \mu^+ \mu^-$ decay. Moreover, we also consider lepton-flavor ratios ($R^{\tau\mu}$) of all of these observables. We find that the current data allows for deviations ranging from 25% up to an order of magnitude from the SM value in a number of observables. For e.g., the magnitudes of $Q^{\tau \mu}_{P_3}$ and $Q^{\tau \mu}_{P'_8}$ observables can be enhanced up to an order of magnitude, a twofold enhancement in $Q^{\tau\mu}_{A_{FB}}$ is possible along with $\sim$50% enhancement in $R^{\tau\mu}_{K^*}$ and $\sim$25% in $R^{\tau\mu}_{A_{FB}}$. Moreover, the branching ratio of $B \to K^* \tau^+ \tau^-$ can be suppressed up to 25%. A precise measurement of these observables can also discriminate between a number of new physics solutions.
|
hep-ph/0004173
|
Keum Yong-Yeon
|
Y.-Y. Keum, H.-n. Li and A.I. Sanda
|
Penguin Enhancement and $B\to K\pi$ decays in perturbative QCD
|
Latex, 57 pages including 3 tables and 13 figures
|
Phys.Rev.D63:054008,2001
|
10.1103/PhysRevD.63.054008
|
NCKU-HEP-00-01, DPNU-00-14, APCTP-00-05
|
hep-ph
| null |
We compute branching ratios of $B\to K\pi$ decays in the framework of
perturbative QCD factorization theorem. Decay amplitudes are classified into
the topologies of tree, penguin and annihilation, all of which contain both
factorizable and nonfactorizable contributions. These contributions are
expressed as the convolutions of hard $b$ quark decay amplitudes with universal
meson wave functions. It is shown that (1) matrix elements of penguin operators
are dynamically enhanced compared to those employed in the factorization
assumption; (2) annihilation diagrams are not negligible, contrary to common
belief; (3) annihilation diagrams contribute large strong phases; (4) the
uncertainty of current data of the ratio $R={\cal B}(B_d^0\to
K^\pm\pi^\mp)/{\cal B}(B^\pm\to K^0\pi^\pm)$ and of CP asymmetries is too large
to give a constraint of $\phi_3$. Assuming $\phi_3=90^o$ which is extracted
from the best fit to the data of $R$, predictions for the branching ratios of
the four $B\to K\pi$ modes are consistent with data.
|
[
{
"created": "Tue, 18 Apr 2000 08:32:27 GMT",
"version": "v1"
}
] |
2009-07-09
|
[
[
"Keum",
"Y. -Y.",
""
],
[
"Li",
"H. -n.",
""
],
[
"Sanda",
"A. I.",
""
]
] |
We compute branching ratios of $B\to K\pi$ decays in the framework of perturbative QCD factorization theorem. Decay amplitudes are classified into the topologies of tree, penguin and annihilation, all of which contain both factorizable and nonfactorizable contributions. These contributions are expressed as the convolutions of hard $b$ quark decay amplitudes with universal meson wave functions. It is shown that (1) matrix elements of penguin operators are dynamically enhanced compared to those employed in the factorization assumption; (2) annihilation diagrams are not negligible, contrary to common belief; (3) annihilation diagrams contribute large strong phases; (4) the uncertainty of current data of the ratio $R={\cal B}(B_d^0\to K^\pm\pi^\mp)/{\cal B}(B^\pm\to K^0\pi^\pm)$ and of CP asymmetries is too large to give a constraint of $\phi_3$. Assuming $\phi_3=90^o$ which is extracted from the best fit to the data of $R$, predictions for the branching ratios of the four $B\to K\pi$ modes are consistent with data.
|
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