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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0512098
|
Sergey Gevorkyan
|
S.R. Gevorkyan, A.V. Tarasov
|
Challenge of lepton pair production in peripheral collisions of
relativistic ions
|
9 pages, 1 figure
|
Physics of Particles and Nuclei Letters 10: 167-174, 2013
| null | null |
hep-ph
| null |
The new approach to the lepton pair production in the Coulomb field of two
highly relativistic nuclei was developed.Solving the operator equation for
lepton scattering in arbitrary Coulomb field, we obtain the amplitudes for
lepton scattering in the Coulomb potential in terms of light cone variables.
Using the Watson expansion for the amplitude of lepton scattering on two
centers we propose prescription which allows one to construct the amplitude for
lepton pair production in the Coulomb field of two highly relativistic ions. We
show that for the certain sums of finite terms of the Watson series numerous
cancellations lead to infrared stability of amplitude.
|
[
{
"created": "Thu, 8 Dec 2005 10:48:35 GMT",
"version": "v1"
}
] |
2013-07-23
|
[
[
"Gevorkyan",
"S. R.",
""
],
[
"Tarasov",
"A. V.",
""
]
] |
The new approach to the lepton pair production in the Coulomb field of two highly relativistic nuclei was developed.Solving the operator equation for lepton scattering in arbitrary Coulomb field, we obtain the amplitudes for lepton scattering in the Coulomb potential in terms of light cone variables. Using the Watson expansion for the amplitude of lepton scattering on two centers we propose prescription which allows one to construct the amplitude for lepton pair production in the Coulomb field of two highly relativistic ions. We show that for the certain sums of finite terms of the Watson series numerous cancellations lead to infrared stability of amplitude.
|
1312.0592
|
Zvi Bern
|
Z. Bern, L. J. Dixon, F. Febres Cordero, S. Hoeche, H. Ita, D. A.
Kosower, N. A. Lo Presti and D. Maitre
|
Next-to-leading order diphoton+2-jet production at the LHC
|
10 pages, 4 figures, Presented at 11th International Symposium on
Radiative Corrections (RADCOR 2013), 22-27 September 2013, Lumley Castle
Hotel, Durham, UK
| null | null |
IPhT--T13/269, SLAC--PUB--15847, UCLA/13/TEP/110, IPPP/13/96
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present results from a recent calculation of prompt photon-pair production
in association with two jets to next-to-leading order (NLO) at the LHC. The
virtual contribution is evaluated using the BlackHat library, a numerical
implementation of on-shell methods for one-loop amplitudes, in conjunction with
SHERPA. We study four sets of cuts: standard jet cuts, a set of Higgs-related
cuts suggested by ATLAS, and corresponding sets which isolate the kinematic
region where the process becomes the largest background to Higgs production via
vector-boson fusion.
|
[
{
"created": "Mon, 2 Dec 2013 20:59:09 GMT",
"version": "v1"
}
] |
2013-12-03
|
[
[
"Bern",
"Z.",
""
],
[
"Dixon",
"L. J.",
""
],
[
"Cordero",
"F. Febres",
""
],
[
"Hoeche",
"S.",
""
],
[
"Ita",
"H.",
""
],
[
"Kosower",
"D. A.",
""
],
[
"Presti",
"N. A. Lo",
""
],
[
"Maitre",
"D.",
""
]
] |
We present results from a recent calculation of prompt photon-pair production in association with two jets to next-to-leading order (NLO) at the LHC. The virtual contribution is evaluated using the BlackHat library, a numerical implementation of on-shell methods for one-loop amplitudes, in conjunction with SHERPA. We study four sets of cuts: standard jet cuts, a set of Higgs-related cuts suggested by ATLAS, and corresponding sets which isolate the kinematic region where the process becomes the largest background to Higgs production via vector-boson fusion.
|
2108.02779
|
Andrew Larkoski
|
Kees Benkendorfer and Andrew J. Larkoski
|
Grooming at the Cusp: All-Orders Predictions for the Transition Region
of Jet Groomers
|
20 pages + appendices, 6 figures; v2: added an appendix with plots of
the cusp for 1 TeV collisions; v3: JHEP version, added some more discussion
of the accuracy and validity of the factorization
| null |
10.1007/JHEP11(2021)188
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Jet grooming has emerged as a necessary and vital tool for mitigating
contamination radiation in jets. The additional restrictions on emissions
imposed by the groomer can result in non-smooth behavior of resulting
fixed-order distributions of observables measured on groomed jets. As a
concrete example, we study the cusp in the hemisphere mass distribution of
$e^+e^-\to$ hadrons events groomed with soft drop. We identify the leading
emissions that contribute in the region about the cusp and formulate an
all-orders factorization theorem that describes how the cusp is resolved
through arbitrary strongly-ordered soft and collinear emissions. The
factorization theorem exhibits numerous novel features such as contributions
from collinear modes that can cross hemisphere boundaries as well as requiring
explicit subtraction of the limit in which resolved emissions become collinear
to the hard core. We present resummation of the cusp region through
next-to-leading logarithmic accuracy and describe how it can be matched with
established factorization theorems that describe other groomed phase space
regions.
|
[
{
"created": "Thu, 5 Aug 2021 18:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Aug 2021 17:44:30 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Oct 2021 12:50:10 GMT",
"version": "v3"
}
] |
2021-12-08
|
[
[
"Benkendorfer",
"Kees",
""
],
[
"Larkoski",
"Andrew J.",
""
]
] |
Jet grooming has emerged as a necessary and vital tool for mitigating contamination radiation in jets. The additional restrictions on emissions imposed by the groomer can result in non-smooth behavior of resulting fixed-order distributions of observables measured on groomed jets. As a concrete example, we study the cusp in the hemisphere mass distribution of $e^+e^-\to$ hadrons events groomed with soft drop. We identify the leading emissions that contribute in the region about the cusp and formulate an all-orders factorization theorem that describes how the cusp is resolved through arbitrary strongly-ordered soft and collinear emissions. The factorization theorem exhibits numerous novel features such as contributions from collinear modes that can cross hemisphere boundaries as well as requiring explicit subtraction of the limit in which resolved emissions become collinear to the hard core. We present resummation of the cusp region through next-to-leading logarithmic accuracy and describe how it can be matched with established factorization theorems that describe other groomed phase space regions.
|
1501.03781
|
Alberto Salvio
|
Alberto Salvio
|
A Simple Motivated Completion of the Standard Model below the Planck
Scale: Axions and Right-Handed Neutrinos
|
8 pages, 4 figures. Phys. Lett. B version: references and discussion
on light right-handed neutrinos added
| null |
10.1016/j.physletb.2015.03.015
|
IFT-UAM/CSIC-15-003
|
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study a simple Standard Model (SM) extension, which includes three
families of right-handed neutrinos with generic non-trivial flavor structure
and an economic implementation of the invisible axion idea. We find that in
some regions of the parameter space this model accounts for all experimentally
confirmed pieces of evidence for physics beyond the SM: it explains neutrino
masses (via the type-I see-saw mechanism), dark matter, baryon asymmetry
(through leptogenesis), solve the strong CP problem and has a stable
electroweak vacuum. The last property may allow us to identify the Higgs field
with the inflaton.
|
[
{
"created": "Thu, 15 Jan 2015 19:16:39 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jan 2015 11:57:42 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Mar 2015 10:19:47 GMT",
"version": "v3"
}
] |
2015-04-14
|
[
[
"Salvio",
"Alberto",
""
]
] |
We study a simple Standard Model (SM) extension, which includes three families of right-handed neutrinos with generic non-trivial flavor structure and an economic implementation of the invisible axion idea. We find that in some regions of the parameter space this model accounts for all experimentally confirmed pieces of evidence for physics beyond the SM: it explains neutrino masses (via the type-I see-saw mechanism), dark matter, baryon asymmetry (through leptogenesis), solve the strong CP problem and has a stable electroweak vacuum. The last property may allow us to identify the Higgs field with the inflaton.
|
hep-ph/9509370
|
Michael Martin Nieto
|
Michael Martin Nieto
|
Quantum Interference: From Kaons to Neutrinos (with Quantum Beats in
between)
|
12 pages, LaTeX, 3 figures
|
Hyperfine Interact. 100 (1996) 193
|
10.1007/BF02059943
|
LA-UR-95-2030
|
hep-ph quant-ph
| null |
Using the vehicle of resolving an apparent paradox, a discussion of quantum
interference is presented. The understanding of a number of different physical
phenomena can be unified, in this context. These range from the neutral kaon
system to massive neutrinos, not to mention quantum beats, Rydberg wave
packets, and neutron gravity.
|
[
{
"created": "Fri, 22 Sep 1995 21:42:55 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Nieto",
"Michael Martin",
""
]
] |
Using the vehicle of resolving an apparent paradox, a discussion of quantum interference is presented. The understanding of a number of different physical phenomena can be unified, in this context. These range from the neutral kaon system to massive neutrinos, not to mention quantum beats, Rydberg wave packets, and neutron gravity.
|
2005.07222
|
Navin McGinnis
|
Radovan Dermisek, Enrico Lunghi, Navin McGinnis, Seodong Shin
|
Signals with six bottom quarks for charged and neutral Higgs bosons
|
21 pages, 12 figures, 4 tables. v2: Minor mistakes and typos
corrected, main results unchanged, matches published version
| null |
10.1007/JHEP07(2020)241
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In extensions of two Higgs doublet models with vectorlike quarks, the decays
of vectorlike quarks may easily be dominated by cascade decays through charged
or neutral Higgs bosons leading to signatures with 6 top or bottom quarks.
Since top quark decays also contain bottom quarks, a common signature for many
possible decay chains is 6 bottom quarks in the final state. We present a
search strategy focusing on this final state and find the mass ranges of
vectorlike quarks and Higgs bosons that can be explored at the Large Hadron
Collider. Among other results, the sensitivity to the charged and neutral Higgs
bosons, extending to about 2 TeV, stands out when compared to models without
vectorlike matter.
|
[
{
"created": "Thu, 14 May 2020 18:52:18 GMT",
"version": "v1"
},
{
"created": "Sun, 2 Aug 2020 22:52:13 GMT",
"version": "v2"
}
] |
2020-08-26
|
[
[
"Dermisek",
"Radovan",
""
],
[
"Lunghi",
"Enrico",
""
],
[
"McGinnis",
"Navin",
""
],
[
"Shin",
"Seodong",
""
]
] |
In extensions of two Higgs doublet models with vectorlike quarks, the decays of vectorlike quarks may easily be dominated by cascade decays through charged or neutral Higgs bosons leading to signatures with 6 top or bottom quarks. Since top quark decays also contain bottom quarks, a common signature for many possible decay chains is 6 bottom quarks in the final state. We present a search strategy focusing on this final state and find the mass ranges of vectorlike quarks and Higgs bosons that can be explored at the Large Hadron Collider. Among other results, the sensitivity to the charged and neutral Higgs bosons, extending to about 2 TeV, stands out when compared to models without vectorlike matter.
|
0710.1454
|
Yue Zhang
|
Yue Zhang (Peking U. & Maryland U.), Haipeng An (Maryland U.),
Xiangdong Ji (Maryland U. & Peking U.)
|
Constraining Right-Handed Scale Through Kaon Mixing in SUSY Left-Right
Model
|
12 pages, new figures added
|
Phys.Rev.D78:035006,2008
|
10.1103/PhysRevD.78.035006
| null |
hep-ph
| null |
We study flavor-changing neutral current and CP violations in the minimal
supersymmetric left-right model. We calculate the beyond-standard-model
contributions to the neutral kaon mixing $\Delta M_K$ and $\epsilon$, and find
possible to have a numerical cancelation between the contributions from the
right-handed gauge boson and supersymmetric box diagram. With the cancelation,
the right-handed $W$-boson mass scale can be lowered to about 2 TeV, well
within the search limit of LHC.
|
[
{
"created": "Mon, 8 Oct 2007 01:45:16 GMT",
"version": "v1"
},
{
"created": "Fri, 23 May 2008 02:07:49 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Zhang",
"Yue",
"",
"Peking U. & Maryland U."
],
[
"An",
"Haipeng",
"",
"Maryland U."
],
[
"Ji",
"Xiangdong",
"",
"Maryland U. & Peking U."
]
] |
We study flavor-changing neutral current and CP violations in the minimal supersymmetric left-right model. We calculate the beyond-standard-model contributions to the neutral kaon mixing $\Delta M_K$ and $\epsilon$, and find possible to have a numerical cancelation between the contributions from the right-handed gauge boson and supersymmetric box diagram. With the cancelation, the right-handed $W$-boson mass scale can be lowered to about 2 TeV, well within the search limit of LHC.
|
hep-ph/0406120
|
Mairi Sakellariadou
|
Jonathan Rocher and Mairi Sakellariadou
|
Constraints on Supersymmetric Grand Unified Theories from Cosmology
|
32 pages, 7 figures. To match published version
|
JCAP0503:004,2005
|
10.1088/1475-7516/2005/03/004
| null |
hep-ph astro-ph gr-qc hep-th
| null |
Within the context of SUSY GUTs, cosmic strings are generically formed at the
end of hybrid inflation. However, the WMAP CMB measurements strongly constrain
the possible cosmic strings contribution to the angular power spectrum of
anisotropies. We investigate the parameter space of SUSY hybrid (F- and D-
term) inflation, to get the conditions under which theoretical predictions are
in agreement with data. The predictions of F-term inflation are in agreement
with data, only if the superpotential coupling $\kappa$ is small. In
particular, for SUSY SO(10), the upper bound is $\kappa\lsim 7\times 10^{-7}$.
This fine tuning problem can be lifted if we employ the curvaton mechanism, in
which case $\kappa\lsim 8\times 10^{-3}$; higher values are not allowed by the
gravitino constraint. The constraint on $\kappa$ is equivalent to a constraint
on the SSB mass scale $M$, namely $M \lsim 2\times 10^{15}$ GeV. The study of
D-term inflation shows that the inflaton field is of the order of the Planck
scale; one should therefore consider SUGRA. We find that the cosmic strings
contribution to the CMB anisotropies is not constant, but it is strongly
dependent on the gauge coupling $g$ and on the superpotential coupling
$\lambda$. We obtain $g\lsim 2\times 10^{-2}$ and $\lambda \lsim 3\times
10^{-5}$. SUGRA corrections induce also a lower limit for $\lambda$.
Equivalently, the Fayet-Iliopoulos term $\xi$ must satisfy $\sqrt\xi \lsim
2\times 10^{15}$ GeV. This constraint holds for all allowed values of $g$.
|
[
{
"created": "Thu, 10 Jun 2004 11:18:56 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Mar 2005 15:03:17 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Rocher",
"Jonathan",
""
],
[
"Sakellariadou",
"Mairi",
""
]
] |
Within the context of SUSY GUTs, cosmic strings are generically formed at the end of hybrid inflation. However, the WMAP CMB measurements strongly constrain the possible cosmic strings contribution to the angular power spectrum of anisotropies. We investigate the parameter space of SUSY hybrid (F- and D- term) inflation, to get the conditions under which theoretical predictions are in agreement with data. The predictions of F-term inflation are in agreement with data, only if the superpotential coupling $\kappa$ is small. In particular, for SUSY SO(10), the upper bound is $\kappa\lsim 7\times 10^{-7}$. This fine tuning problem can be lifted if we employ the curvaton mechanism, in which case $\kappa\lsim 8\times 10^{-3}$; higher values are not allowed by the gravitino constraint. The constraint on $\kappa$ is equivalent to a constraint on the SSB mass scale $M$, namely $M \lsim 2\times 10^{15}$ GeV. The study of D-term inflation shows that the inflaton field is of the order of the Planck scale; one should therefore consider SUGRA. We find that the cosmic strings contribution to the CMB anisotropies is not constant, but it is strongly dependent on the gauge coupling $g$ and on the superpotential coupling $\lambda$. We obtain $g\lsim 2\times 10^{-2}$ and $\lambda \lsim 3\times 10^{-5}$. SUGRA corrections induce also a lower limit for $\lambda$. Equivalently, the Fayet-Iliopoulos term $\xi$ must satisfy $\sqrt\xi \lsim 2\times 10^{15}$ GeV. This constraint holds for all allowed values of $g$.
|
hep-ph/0604209
|
Jean-Paul Blaizot
|
G. Baym, J.-P. Blaizot, F. Gelis, T. Matsui
|
Landau-Pomeranchuck-Migdal effect in a quark-gluon plasma and the
Boltzmann equation
|
17 pages, 4 figures Minor rewriting. In particular, the specific
small angle behavior of the collision term involved in the LPM effect is
better explained. Version accepted for publication in Physics Letters B
|
Phys.Lett.B644:48-53,2007
|
10.1016/j.physletb.2006.11.011
|
ECT*-05_21, SPhT-T06-010, UT-Komaba/06-3
|
hep-ph cond-mat.other nucl-th
| null |
We show how the Landau-Pomeranchuk-Migdal effect on photon production rates
in a quark-gluon plasma can be derived via the usual Boltzmann equation. To do
this, we first derive the electromagnetic polarization tensor using linear
response theory, and then formulate the Boltzmann equation including the
collisions mediated by soft gluon exchanges. We then identify the resulting
expression for the production rate with that obtained by the field-theoretic
formalism recently proposed by Arnold, Moore and Yaffe. To illustrate the LPM
effect we solve the Boltzmann equation in the diffusion approximation.
|
[
{
"created": "Tue, 25 Apr 2006 07:09:18 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Dec 2006 18:52:22 GMT",
"version": "v2"
}
] |
2011-07-19
|
[
[
"Baym",
"G.",
""
],
[
"Blaizot",
"J. -P.",
""
],
[
"Gelis",
"F.",
""
],
[
"Matsui",
"T.",
""
]
] |
We show how the Landau-Pomeranchuk-Migdal effect on photon production rates in a quark-gluon plasma can be derived via the usual Boltzmann equation. To do this, we first derive the electromagnetic polarization tensor using linear response theory, and then formulate the Boltzmann equation including the collisions mediated by soft gluon exchanges. We then identify the resulting expression for the production rate with that obtained by the field-theoretic formalism recently proposed by Arnold, Moore and Yaffe. To illustrate the LPM effect we solve the Boltzmann equation in the diffusion approximation.
|
hep-ph/0401204
|
Akaki Rusetsky
|
J. Gasser (Bern University), A. Rusetsky (Bonn University and Tbilisi
University), J. Schacher (Bern University)
|
HadAtom03
|
46 pages, 16 postscript figures, Proceedings of the workshop
"HadAtom03," 13-17 October Trento, Italy
| null | null |
Preprints ECT*-04-01, HISKP-TH-04/02
|
hep-ph
| null |
These are the proceedings of the workshop "HadAtom03," held at the European
Centre for Theoretical Nuclear Physics and Related Studies (ECT*), Trento
(Italy), October 13 - 17, 2003. The main topics discussed at the workshop were
the physics of hadronic atoms and in this context recent results in experiment
and theory. Included here are the list of participants, the scientific program
and a short contribution from each speaker.
|
[
{
"created": "Mon, 26 Jan 2004 15:25:59 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Gasser",
"J.",
"",
"Bern University"
],
[
"Rusetsky",
"A.",
"",
"Bonn University and Tbilisi\n University"
],
[
"Schacher",
"J.",
"",
"Bern University"
]
] |
These are the proceedings of the workshop "HadAtom03," held at the European Centre for Theoretical Nuclear Physics and Related Studies (ECT*), Trento (Italy), October 13 - 17, 2003. The main topics discussed at the workshop were the physics of hadronic atoms and in this context recent results in experiment and theory. Included here are the list of participants, the scientific program and a short contribution from each speaker.
|
1407.8448
|
Rick Gupta
|
Rick S. Gupta
|
BSM Primary Effects: The complete set of predictions from the
dimension-6 BSM Lagrangian
|
Based on talk given at DIS 2014. This talk was completely based on
arXiv:1405.0181, which was written in collaboration with A. Pomarol and F.
Riva
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a physical parameterization of the leading effects beyond the SM
(BSM), that give us, at present, the best way to constrain heavy new-physics at
low-energies. We call these effects that constrain all possible interactions at
the dimension 6 level, BSM Primary effects; there are 8 primaries related to
Higgs physics, 3 related to Triple Gauge Couplings and 7 related to Z- pole
measurements at LEP. Starting from these experimentally measurable deformations
(and not operators), we construct the dimension 6 Lagrangian in a bottom up
way. We, thus, show that other BSM effects are not independent from the primary
ones and we provide the explicit correlations. We also discuss the theoretical
expectation for the size of these BSM primaries in some well-motivated BSM
theories.
|
[
{
"created": "Thu, 31 Jul 2014 15:05:43 GMT",
"version": "v1"
}
] |
2014-08-01
|
[
[
"Gupta",
"Rick S.",
""
]
] |
We present a physical parameterization of the leading effects beyond the SM (BSM), that give us, at present, the best way to constrain heavy new-physics at low-energies. We call these effects that constrain all possible interactions at the dimension 6 level, BSM Primary effects; there are 8 primaries related to Higgs physics, 3 related to Triple Gauge Couplings and 7 related to Z- pole measurements at LEP. Starting from these experimentally measurable deformations (and not operators), we construct the dimension 6 Lagrangian in a bottom up way. We, thus, show that other BSM effects are not independent from the primary ones and we provide the explicit correlations. We also discuss the theoretical expectation for the size of these BSM primaries in some well-motivated BSM theories.
|
hep-ph/9707337
|
Hoang
|
A.H. Hoang (University of California, San Diego), P. Labelle, S.M.
Zebarjad (McGill University, Montreal)
|
The Single Photon Annihilation Contributions to the Positronium
Hyperfine Splitting to Order $m_e\alpha^6$
|
8 pages, latex, two eps figures included
|
Phys.Rev.Lett. 79 (1997) 3387-3390
|
10.1103/PhysRevLett.79.3387
|
McGill/97-15, UCSD/PTH 97-15
|
hep-ph physics.atom-ph
| null |
The single photon annihilation contributions for the positronium ground state
hyperfine splitting are calculated analytically to order $m_e\alpha^6$ using
NRQED. Based on intuitive physical arguments the same result can also be
determined by a trivial calculation using results from existing literature. Our
result completes the hyperfine splitting calculation to order $m_e\alpha^6$. We
compare the theoretical prediction with the most recent experimental
measurement.
|
[
{
"created": "Sun, 13 Jul 1997 23:44:54 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Hoang",
"A. H.",
"",
"University of California, San Diego"
],
[
"Labelle",
"P.",
"",
"McGill University, Montreal"
],
[
"Zebarjad",
"S. M.",
"",
"McGill University, Montreal"
]
] |
The single photon annihilation contributions for the positronium ground state hyperfine splitting are calculated analytically to order $m_e\alpha^6$ using NRQED. Based on intuitive physical arguments the same result can also be determined by a trivial calculation using results from existing literature. Our result completes the hyperfine splitting calculation to order $m_e\alpha^6$. We compare the theoretical prediction with the most recent experimental measurement.
|
2406.20067
|
Diego Lopez Gutierrez
|
Innes Bigaran, P. S. Bhupal Dev, Diego Lopez Gutierrez, Pedro A. N.
Machado
|
Tau Tridents at Accelerator Neutrino Facilities
|
14 pages, 12 figures, 1 table
| null | null |
FERMILAB-PUB-24-0318-T
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We present the first detailed study of Standard Model (SM) neutrino tridents
involving tau leptons at the near detectors of accelerator neutrino facilities.
These processes were previously thought to be negligible, even at future
facilities like DUNE, based on approximations that underestimated the tau
trident cross sections. Our full $2\to 4$ calculation, including both coherent
and incoherent scatterings, reveals that the DUNE near detector will actually
get a non-negligible number of tau tridents, which is an important background
to new physics searches. We identify promising kinematic features that may
allow distinction of tau tridents from the usual neutrino charged-current
background at DUNE, and thus could establish the observation of tau tridents
for the first time. We also comment on the detection prospects at other
accelerator and collider neutrino experiments.
|
[
{
"created": "Fri, 28 Jun 2024 17:23:44 GMT",
"version": "v1"
}
] |
2024-07-01
|
[
[
"Bigaran",
"Innes",
""
],
[
"Dev",
"P. S. Bhupal",
""
],
[
"Gutierrez",
"Diego Lopez",
""
],
[
"Machado",
"Pedro A. N.",
""
]
] |
We present the first detailed study of Standard Model (SM) neutrino tridents involving tau leptons at the near detectors of accelerator neutrino facilities. These processes were previously thought to be negligible, even at future facilities like DUNE, based on approximations that underestimated the tau trident cross sections. Our full $2\to 4$ calculation, including both coherent and incoherent scatterings, reveals that the DUNE near detector will actually get a non-negligible number of tau tridents, which is an important background to new physics searches. We identify promising kinematic features that may allow distinction of tau tridents from the usual neutrino charged-current background at DUNE, and thus could establish the observation of tau tridents for the first time. We also comment on the detection prospects at other accelerator and collider neutrino experiments.
|
hep-ph/9612442
| null |
P. Binetruy, N. Irges, S. Lavignac and P. Ramond
|
Anomalous U(1) and low-energy physics: the power of D-flatness and
holomorphy
|
16 pages, latex, no figures
|
Phys.Lett.B403:38-46,1997
|
10.1016/S0370-2693(97)00408-5
|
LBNL-39745, UCB-PTH-96/62, UFIFT-HEP-96-32, LPTHE-ORSAY 96/101
|
hep-ph
| null |
In models with an anomalous abelian symmetry broken at a very large scale, we
study which requirements to impose on the anomalous charges in order to prevent
standard model fields from acquiring large vacuum expectation values. The use
of holomorphic invariants to study D-flat directions for the anomalous
symmetry, proves to be a very powerful tool. We find that in order to forbid
unphysical vacuum configurations at that scale, the superpotential must contain
many interaction terms, including the usual Yukawa terms. Our analysis suggests
that the anomalous charge of the \mu-term is zero. It is remarkable that,
together with the seesaw mechanism, and mass hierarchies, this implies a
natural conservation of R-parity.
|
[
{
"created": "Sat, 21 Dec 1996 03:05:37 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Binetruy",
"P.",
""
],
[
"Irges",
"N.",
""
],
[
"Lavignac",
"S.",
""
],
[
"Ramond",
"P.",
""
]
] |
In models with an anomalous abelian symmetry broken at a very large scale, we study which requirements to impose on the anomalous charges in order to prevent standard model fields from acquiring large vacuum expectation values. The use of holomorphic invariants to study D-flat directions for the anomalous symmetry, proves to be a very powerful tool. We find that in order to forbid unphysical vacuum configurations at that scale, the superpotential must contain many interaction terms, including the usual Yukawa terms. Our analysis suggests that the anomalous charge of the \mu-term is zero. It is remarkable that, together with the seesaw mechanism, and mass hierarchies, this implies a natural conservation of R-parity.
|
1310.8419
|
Wojciech Broniowski
|
Wojciech Broniowski, Enrique Ruiz Arriola
|
Valence double parton distributions of the nucleon in a simple model
|
6 pages, talk presented at Light Cone 2013, Skiathos, Greece, 20-24
May 3013
| null |
10.1007/s00601-014-0840-4
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Valence double parton distribution functions of the nucleon are evaluated in
the framework of a simple model, where the conservation of the longitudinal
momentum is taken into account. The leading-order DGLAP QCD evolution from the
low quark-model scale to higher renormalization scales is carried out via the
Mellin moments of the distributions. Results of the valence quark correlation
function show that in general the double distributions cannot be approximated
as a product of the single-particle distributions.
|
[
{
"created": "Thu, 31 Oct 2013 08:04:16 GMT",
"version": "v1"
}
] |
2015-06-17
|
[
[
"Broniowski",
"Wojciech",
""
],
[
"Arriola",
"Enrique Ruiz",
""
]
] |
Valence double parton distribution functions of the nucleon are evaluated in the framework of a simple model, where the conservation of the longitudinal momentum is taken into account. The leading-order DGLAP QCD evolution from the low quark-model scale to higher renormalization scales is carried out via the Mellin moments of the distributions. Results of the valence quark correlation function show that in general the double distributions cannot be approximated as a product of the single-particle distributions.
|
1608.04186
|
Dian-Yong Chen
|
Jun-Zhang Wang, Dian-Yong Chen, Qin-Tao Song, Xiang Liu, Takayuki
Matsuki
|
Revealing the inner structure of the newly observed $D_2^*(3000)$
|
7 pages, 4 figures, 3 tables, minor revision, accepted by Phys. Rev.
D
|
Phys. Rev. D 94, 094044 (2016)
|
10.1103/PhysRevD.94.094044
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Stimulated by the recent observation of the $D_2^\ast(3000)$, we study the
decay behaviors of the $3P$ and $2F$ charmed mesons in the present work. By
comparing the masses and decay properties of the $3^3P_2$ and $2^3F_2$ charmed
mesons with the observation of the $D_2^\ast(3000)$, we conclude that the most
possible assignment of the $D_2^\ast(3000)$ is the $3^3P_2$ charmed meson,
while the assignment of the $2^3F_2$ charmed meson could not be fully exclude.
The results of the unobserved $3P$ and $2F$ charmed mesons in this work could
provide some fundamental information of searching for these charmed mesons in
the further experiments by LHCb and forthcoming Belle II.
|
[
{
"created": "Mon, 15 Aug 2016 06:18:34 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Aug 2016 14:35:57 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Nov 2016 02:47:03 GMT",
"version": "v3"
},
{
"created": "Thu, 3 Nov 2016 01:56:18 GMT",
"version": "v4"
},
{
"created": "Tue, 29 Nov 2016 02:24:55 GMT",
"version": "v5"
}
] |
2016-12-07
|
[
[
"Wang",
"Jun-Zhang",
""
],
[
"Chen",
"Dian-Yong",
""
],
[
"Song",
"Qin-Tao",
""
],
[
"Liu",
"Xiang",
""
],
[
"Matsuki",
"Takayuki",
""
]
] |
Stimulated by the recent observation of the $D_2^\ast(3000)$, we study the decay behaviors of the $3P$ and $2F$ charmed mesons in the present work. By comparing the masses and decay properties of the $3^3P_2$ and $2^3F_2$ charmed mesons with the observation of the $D_2^\ast(3000)$, we conclude that the most possible assignment of the $D_2^\ast(3000)$ is the $3^3P_2$ charmed meson, while the assignment of the $2^3F_2$ charmed meson could not be fully exclude. The results of the unobserved $3P$ and $2F$ charmed mesons in this work could provide some fundamental information of searching for these charmed mesons in the further experiments by LHCb and forthcoming Belle II.
|
0911.2642
|
Egle Tomasi-Gustafsson
|
Egle Tomasi-Gustafsson
|
Charge asymmetry and symmetry properties
|
Contribution to XIII Workshop On High Energy Spin Physics (DSPIN),
Dubna, Russia September 1 - 5, 2009 8 pages 3 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Applying general symmetry properties of electromagnetic interaction,
information from electron proton elastic scattering data can be related to
charge asymmetry in the annihilation channels $e^++e^-\leftrightarrow \bar p +
p$ and to the ratio of the cross section of elastic electron and positron
scattering on the proton. A compared analysis of the existing data allows to
draw conclusions on the reaction mechanism.
|
[
{
"created": "Fri, 13 Nov 2009 16:03:55 GMT",
"version": "v1"
}
] |
2009-11-16
|
[
[
"Tomasi-Gustafsson",
"Egle",
""
]
] |
Applying general symmetry properties of electromagnetic interaction, information from electron proton elastic scattering data can be related to charge asymmetry in the annihilation channels $e^++e^-\leftrightarrow \bar p + p$ and to the ratio of the cross section of elastic electron and positron scattering on the proton. A compared analysis of the existing data allows to draw conclusions on the reaction mechanism.
|
hep-ph/0609205
|
Agnes Mocsy
|
Agnes Mocsy, Peter Petreczky, Jorge Casalderrey-Solana
|
Ground State Quarkonium Spectral Functions Above Deconfinement
|
Contribution to proceedings of "Strong and Electroweak Matter 2006",
Brookhaven, NY, May 2006 and "Hard Probes 2006" Asilomar, CA, June 2006
|
Nucl.Phys.A783:485-488,2007; Nucl.Phys.A785:266-269,2007
|
10.1016/j.nuclphysa.2006.11.100 10.1016/j.nuclphysa.2006.11.147
| null |
hep-ph
| null |
We discuss the temperature-dependence of S-wave quarkonium spectral functions
in a nonrelativistic Green's function approach and compare these to lattice QCD
results.
|
[
{
"created": "Wed, 20 Sep 2006 19:15:46 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Mocsy",
"Agnes",
""
],
[
"Petreczky",
"Peter",
""
],
[
"Casalderrey-Solana",
"Jorge",
""
]
] |
We discuss the temperature-dependence of S-wave quarkonium spectral functions in a nonrelativistic Green's function approach and compare these to lattice QCD results.
|
hep-ph/9701408
| null |
Michael C. Birse, Thomas D. Cohen and Judith A. McGovern
|
Relations Among Correlation Functions in the High Temperature Phase of
QCD with Broken SU(3)
|
8 pages
|
Phys.Lett. B399 (1997) 263-266
|
10.1016/S0370-2693(97)00279-7
|
U. of MD PP\#97-076
|
hep-ph
| null |
Group-theoretic arguments are used to determine the dependence of two-point
correlators of quark bilinears on the current quark masses. The leading
difference between $\pi$ and $\delta$ correlators is found to be of order $m_s$
times a U(1)$_{\scriptscriptstyle A}$-violating correlator. These general
arguments are consistent with Schaefer's observation that if
U(1)$_{\scriptscriptstyle A}$ violation persists to high enough temperatures
then the strange $\eta$ can be lighter than the non-strange one.
|
[
{
"created": "Wed, 29 Jan 1997 14:52:19 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Birse",
"Michael C.",
""
],
[
"Cohen",
"Thomas D.",
""
],
[
"McGovern",
"Judith A.",
""
]
] |
Group-theoretic arguments are used to determine the dependence of two-point correlators of quark bilinears on the current quark masses. The leading difference between $\pi$ and $\delta$ correlators is found to be of order $m_s$ times a U(1)$_{\scriptscriptstyle A}$-violating correlator. These general arguments are consistent with Schaefer's observation that if U(1)$_{\scriptscriptstyle A}$ violation persists to high enough temperatures then the strange $\eta$ can be lighter than the non-strange one.
|
hep-ph/9607331
| null |
Keiichi Akama (Saitama Medical College) and Takashi Hattori (Kanagawa
Dental College)
|
Compositeness Condition for Dynamically Induced Gauge Theories
|
7 pages, revtex, 3 Postscript figures
|
Phys.Lett.B392:383-388,1997
|
10.1016/S0370-2693(96)01580-8
| null |
hep-ph
| null |
We show that the compositeness condition for the induced gauge boson in the
four-fermion interaction theory actually works beyond the one-loop
approximation. The next-to-leading contributions are calculated, and turn out
to be reasonably suppressed, so that the leading-order approximation is
justified.
|
[
{
"created": "Tue, 16 Jul 1996 06:12:54 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Aug 1996 04:27:42 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Akama",
"Keiichi",
"",
"Saitama Medical College"
],
[
"Hattori",
"Takashi",
"",
"Kanagawa\n Dental College"
]
] |
We show that the compositeness condition for the induced gauge boson in the four-fermion interaction theory actually works beyond the one-loop approximation. The next-to-leading contributions are calculated, and turn out to be reasonably suppressed, so that the leading-order approximation is justified.
|
2005.07762
|
Pier Francesco Monni
|
K. Becker, F. Caola, A. Massironi, B. Mistlberger, P. F. Monni, X.
Chen, S. Frixione, T. Gehrmann, N. Glover, K. Hamilton, A. Huss, S. P. Jones,
A. Karlberg, M. Kerner, K. Kudashkin, J. M. Lindert, G. Luisoni, M. L.
Mangano, S. Pozzorini, E. Re, G. P. Salam, E. Vryonidou, C. Wever
|
Precise predictions for boosted Higgs production
|
Journal version
|
SciPost Phys.Core 7 (2024) 001
|
10.21468/SciPostPhysCore.7.1.001
|
CERN-TH-2020-074
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Inclusive Higgs boson production at large transverse momentum is induced by
different production channels. We focus on the leading production through gluon
fusion, and perform a consistent combination of the state of the art
calculations obtained in the infinite-top-mass effective theory at
next-to-next-to-leading order (NNLO) and in the full Standard Model (SM) at
next-to-leading order (NLO). We thus present approximate QCD predictions for
this process at NNLO, and a study of the corresponding perturbative
uncertainties. This calculation is then compared with those obtained with
commonly used event generators, and we observe that the description of the
considered kinematic regime provided by these tools is in good agreement with
state of the art calculations. Finally, we present accurate predictions for
other production channels such as vector boson fusion, and associated
production with a gauge boson, and with a $t\bar{t}$ pair. We find that, at
large transverse momentum, the contribution of other production modes is
substantial, and therefore must be included for a precise theory prediction of
this observable.
|
[
{
"created": "Fri, 15 May 2020 19:41:29 GMT",
"version": "v1"
},
{
"created": "Mon, 3 May 2021 08:55:48 GMT",
"version": "v2"
},
{
"created": "Mon, 5 Feb 2024 07:35:33 GMT",
"version": "v3"
}
] |
2024-06-14
|
[
[
"Becker",
"K.",
""
],
[
"Caola",
"F.",
""
],
[
"Massironi",
"A.",
""
],
[
"Mistlberger",
"B.",
""
],
[
"Monni",
"P. F.",
""
],
[
"Chen",
"X.",
""
],
[
"Frixione",
"S.",
""
],
[
"Gehrmann",
"T.",
""
],
[
"Glover",
"N.",
""
],
[
"Hamilton",
"K.",
""
],
[
"Huss",
"A.",
""
],
[
"Jones",
"S. P.",
""
],
[
"Karlberg",
"A.",
""
],
[
"Kerner",
"M.",
""
],
[
"Kudashkin",
"K.",
""
],
[
"Lindert",
"J. M.",
""
],
[
"Luisoni",
"G.",
""
],
[
"Mangano",
"M. L.",
""
],
[
"Pozzorini",
"S.",
""
],
[
"Re",
"E.",
""
],
[
"Salam",
"G. P.",
""
],
[
"Vryonidou",
"E.",
""
],
[
"Wever",
"C.",
""
]
] |
Inclusive Higgs boson production at large transverse momentum is induced by different production channels. We focus on the leading production through gluon fusion, and perform a consistent combination of the state of the art calculations obtained in the infinite-top-mass effective theory at next-to-next-to-leading order (NNLO) and in the full Standard Model (SM) at next-to-leading order (NLO). We thus present approximate QCD predictions for this process at NNLO, and a study of the corresponding perturbative uncertainties. This calculation is then compared with those obtained with commonly used event generators, and we observe that the description of the considered kinematic regime provided by these tools is in good agreement with state of the art calculations. Finally, we present accurate predictions for other production channels such as vector boson fusion, and associated production with a gauge boson, and with a $t\bar{t}$ pair. We find that, at large transverse momentum, the contribution of other production modes is substantial, and therefore must be included for a precise theory prediction of this observable.
|
hep-ph/0101023
|
Andreas S. Kronfeld
|
Aida X. El-Khadra, Andreas S. Kronfeld, Paul B. Mackenzie, Sinead M.
Ryan and James N. Simone
|
The Semileptonic Decays $B\to\pi l\nu$ and $D\to\pi l\nu$ from Lattice
QCD
|
35 pp, 12 figs
|
Phys.Rev.D64:014502,2001
|
10.1103/PhysRevD.64.014502
|
FERMILAB-PUB-00/346-T
|
hep-ph hep-lat
| null |
We present a lattice QCD calculation of the form factors and differential
decay rates for semileptonic decays of the heavy-light mesons $B$ and $D$ to
the final state $\pi l\nu$. The results are obtained with three methodological
improvements over previous lattice calculations: a matching procedure that
reduces heavy-quark lattice artifacts, the first study of lattice-spacing
dependence, and the introduction of kinematic cuts to reduce model dependence.
We show that the main systematics are controllable (within the quenched
approximation) and outline how the calculations could be improved to aid
current experiments in the determination of~$|V_{ub}|$ and~$|V_{cd}|$.
|
[
{
"created": "Tue, 2 Jan 2001 22:35:37 GMT",
"version": "v1"
}
] |
2010-11-19
|
[
[
"El-Khadra",
"Aida X.",
""
],
[
"Kronfeld",
"Andreas S.",
""
],
[
"Mackenzie",
"Paul B.",
""
],
[
"Ryan",
"Sinead M.",
""
],
[
"Simone",
"James N.",
""
]
] |
We present a lattice QCD calculation of the form factors and differential decay rates for semileptonic decays of the heavy-light mesons $B$ and $D$ to the final state $\pi l\nu$. The results are obtained with three methodological improvements over previous lattice calculations: a matching procedure that reduces heavy-quark lattice artifacts, the first study of lattice-spacing dependence, and the introduction of kinematic cuts to reduce model dependence. We show that the main systematics are controllable (within the quenched approximation) and outline how the calculations could be improved to aid current experiments in the determination of~$|V_{ub}|$ and~$|V_{cd}|$.
|
0901.2236
|
Alfredo Urbano
|
Paolo Ciafaloni, Marco Picariello, Emilio Torrente-Lujan, Alfredo
Urbano
|
Neutrino masses and tribimaximal mixing in the minimal renormalizable
supersymmetric SU(5) grand unified model with A4 flavor symmetry
|
V1: 22 pages, V2: 16 pages, published version, results unchanged
|
Phys.Rev.D79:116010,2009
|
10.1103/PhysRevD.79.116010
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze all possible extensions of the recently proposed minimal
renormalizable SUSY SU(5) grand unified model with the inclusion of an
additional A4 flavor symmetry. We find that there are five possible cases but
only one of them is phenomenologically interesting. We develop in detail such
case and we show how the fermion masses and mixing angles come out. As a
prediction we obtain the neutrino masses of order of 0.1 eV with an inverted
hierarchy.
|
[
{
"created": "Thu, 15 Jan 2009 12:27:52 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jun 2009 09:58:32 GMT",
"version": "v2"
}
] |
2009-07-09
|
[
[
"Ciafaloni",
"Paolo",
""
],
[
"Picariello",
"Marco",
""
],
[
"Torrente-Lujan",
"Emilio",
""
],
[
"Urbano",
"Alfredo",
""
]
] |
We analyze all possible extensions of the recently proposed minimal renormalizable SUSY SU(5) grand unified model with the inclusion of an additional A4 flavor symmetry. We find that there are five possible cases but only one of them is phenomenologically interesting. We develop in detail such case and we show how the fermion masses and mixing angles come out. As a prediction we obtain the neutrino masses of order of 0.1 eV with an inverted hierarchy.
|
1312.1796
|
Hongshi Zong
|
Yi-lun Du, Zhu-fang Cui, Yong-hui Xia and Hong-shi Zong
|
Discussions on the crossover property within the Nambu--Jona-Lasinio
model
| null |
Phys. Rev. D 88, 114019 (2013)
|
10.1103/PhysRevD.88.114019
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, chiral symmetry breaking and its restoration are investigated
in the mean field approximation of Nambu--Jona-Lasinio model. A first-order
phase transition exists at low temperature, but is smeared out at high
temperature. We discuss the rationality of using susceptibilities as the
criteria to determine the crossover region as well as the critical point. Based
on our results, it is found that to define a critical band instead of an
exclusive line in this region might be a more suitable choice.
|
[
{
"created": "Fri, 6 Dec 2013 08:17:42 GMT",
"version": "v1"
}
] |
2013-12-09
|
[
[
"Du",
"Yi-lun",
""
],
[
"Cui",
"Zhu-fang",
""
],
[
"Xia",
"Yong-hui",
""
],
[
"Zong",
"Hong-shi",
""
]
] |
In this paper, chiral symmetry breaking and its restoration are investigated in the mean field approximation of Nambu--Jona-Lasinio model. A first-order phase transition exists at low temperature, but is smeared out at high temperature. We discuss the rationality of using susceptibilities as the criteria to determine the crossover region as well as the critical point. Based on our results, it is found that to define a critical band instead of an exclusive line in this region might be a more suitable choice.
|
2005.13968
|
Manjit Kaur Dr.
|
A. Kaur, M. Kaur and R. Aggarwal
|
Investigation of particle production in $h{\text -}A$ collisions using
statistical distributions
|
21 pages, 10 figures 9 Tables
| null |
10.1142/S0218301321500075
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Study of the characteristic properties of charged particle production in
hadron-nucleus collisions at high energies, by utilising the approaches from
different statistical models is performed.~Predictions from different
approaches using the Negative Binomial distribution, shifted Gompertz
distribution, Weibull distribution and the Krasznovszky-Wagner distribution are
utilised for a comparative study of the relative successes of these
models.~These distributions derived from a variety of functional forms are
based on either phenomenological parameterizations or some model of the
underlying dynamics.~Some of these have have also been used to study the data
at the LHC for both proton-proton and nucleus-nucleus collisions.~Various
physical and derived observables have been used for the analysis.
|
[
{
"created": "Thu, 28 May 2020 13:16:17 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Aug 2020 10:39:36 GMT",
"version": "v2"
}
] |
2021-04-07
|
[
[
"Kaur",
"A.",
""
],
[
"Kaur",
"M.",
""
],
[
"Aggarwal",
"R.",
""
]
] |
Study of the characteristic properties of charged particle production in hadron-nucleus collisions at high energies, by utilising the approaches from different statistical models is performed.~Predictions from different approaches using the Negative Binomial distribution, shifted Gompertz distribution, Weibull distribution and the Krasznovszky-Wagner distribution are utilised for a comparative study of the relative successes of these models.~These distributions derived from a variety of functional forms are based on either phenomenological parameterizations or some model of the underlying dynamics.~Some of these have have also been used to study the data at the LHC for both proton-proton and nucleus-nucleus collisions.~Various physical and derived observables have been used for the analysis.
|
0712.3963
|
Rom\'an Linares
|
Roman Linares, Hugo A. Morales-Tecotl, Omar Pedraza
|
Casimir force for a scalar field in warped brane worlds
|
22 pages, 2 figures
|
Phys.Rev.D77:066012,2008
|
10.1103/PhysRevD.77.066012
| null |
hep-ph
| null |
In looking for imprints of extra dimensions in brane world models one usually
builts these so that they are compatible with known low energy physics and thus
focuses on high energy effects. Nevertheless, just as submillimeter Newton's
law tests probe the mode structure of gravity other low energy tests might
apply to matter. As a model example, in this work we determine the 4D Casimir
force corresponding to a scalar field subject to Dirichlet boundary conditions
on two parallel planes lying within the single brane of a Randall-Sundrum
scenario extended by one compact extra dimension. Using the Green's function
method such a force picks the contribution of each field mode as if it acted
individually but with a weight given by the square of the mode wave functions
on the brane. In the low energy regime one regains the standard 4D Casimir
force that is associated to a zero mode in the massless case or to a
quasilocalized or resonant mode in the massive one whilst the effect of the
extra dimensions gets encoded as an additional term.
|
[
{
"created": "Mon, 24 Dec 2007 02:27:20 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Linares",
"Roman",
""
],
[
"Morales-Tecotl",
"Hugo A.",
""
],
[
"Pedraza",
"Omar",
""
]
] |
In looking for imprints of extra dimensions in brane world models one usually builts these so that they are compatible with known low energy physics and thus focuses on high energy effects. Nevertheless, just as submillimeter Newton's law tests probe the mode structure of gravity other low energy tests might apply to matter. As a model example, in this work we determine the 4D Casimir force corresponding to a scalar field subject to Dirichlet boundary conditions on two parallel planes lying within the single brane of a Randall-Sundrum scenario extended by one compact extra dimension. Using the Green's function method such a force picks the contribution of each field mode as if it acted individually but with a weight given by the square of the mode wave functions on the brane. In the low energy regime one regains the standard 4D Casimir force that is associated to a zero mode in the massless case or to a quasilocalized or resonant mode in the massive one whilst the effect of the extra dimensions gets encoded as an additional term.
|
hep-ph/9511365
|
Paulo Bedaque
|
Paulo F. Bedaque (MIT,USA)
|
Chiral perturbation theory analysis of baryon temperature mass shifts
|
8 pages + 4 uuencoded figures (or available from the Author upon
request), REVTEX. Figures previously corrupted are corrected
|
Phys.Lett.B387:1-8,1996
|
10.1016/0370-2693(96)00985-9
| null |
hep-ph nucl-th
| null |
We compute the finite temperature pole mass shifts of the octet and decuplet
baryons using heavy baryon chiral perturbation theory and the 1/N_c expansion,
where N_c is the number of QCD colors. We consider temperatures of the order of
the pion mass m_\pi, and truncate the chiral and 1/N_c expansions assuming that
m_\pi \sim 1/N_c. There are three scales in the problem: the temperature T, the
pion mass m_\pi, and the octet--decuplet mass difference. Therefore, the result
is not simply a power series in T. We find that the nucleon and \Delta
temperature mass shifts are opposite in sign, and that their mass difference
changes by 20% in the temperature range 90 MeV < T < 130 MeV, that is the range
where the freeze out in relativistic heavy ion collisions is expected to occur.
We argue that our results are insensitive to the neglect of 1/N_c- supressed
effects; the main purpose of the 1/N_c expansion in this work is to justify our
treatment of the decuplet states.
|
[
{
"created": "Sat, 18 Nov 1995 00:23:22 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Nov 1995 21:00:04 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Bedaque",
"Paulo F.",
"",
"MIT,USA"
]
] |
We compute the finite temperature pole mass shifts of the octet and decuplet baryons using heavy baryon chiral perturbation theory and the 1/N_c expansion, where N_c is the number of QCD colors. We consider temperatures of the order of the pion mass m_\pi, and truncate the chiral and 1/N_c expansions assuming that m_\pi \sim 1/N_c. There are three scales in the problem: the temperature T, the pion mass m_\pi, and the octet--decuplet mass difference. Therefore, the result is not simply a power series in T. We find that the nucleon and \Delta temperature mass shifts are opposite in sign, and that their mass difference changes by 20% in the temperature range 90 MeV < T < 130 MeV, that is the range where the freeze out in relativistic heavy ion collisions is expected to occur. We argue that our results are insensitive to the neglect of 1/N_c- supressed effects; the main purpose of the 1/N_c expansion in this work is to justify our treatment of the decuplet states.
|
2310.17978
|
Shohei Takada
|
Shota Kikuchi, Tatsuo Kobayashi, Kaito Nasu, Shohei Takada, Hikaru
Uchida
|
$Sp(6,Z)$ modular symmetry in flavor structures: quark flavor models and
Siegel modular forms for $\widetilde{\Delta}(96)$
|
54 pages
| null | null |
EPHOU-23-018
|
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We study an approach to construct Siegel modular forms from $Sp(6,Z)$.
Zero-mode wave functions on $T^6$ with magnetic flux background behave Siegel
modular forms at the origin. Then $T$-symmetries partially break depending on
the form of background magnetic flux. We study the background such that three
$T$-symmetries $T_I$, $T_{II}$ and $T_{III}$ as well as the $S$-symmetry
remain.Consequently, we obtain Siegel modular forms with three moduli
parameters $(\omega_1,\omega_2,\omega_3)$, which are multiplets of finite
modular groups. We show several examples. As one of examples, we study Siegel
modular forms for $\widetilde{\Delta}(96)$ in detail. Then, as a
phenomenological applicantion, we study quark flavor models using Siegel
modular forms for $\widetilde{\Delta}(96)$. Around the cusp,
$\omega_1=i\infty$, the Siegel modular forms have hierarchical values depending
on their $T_I$-charges. We show the deviation of $\omega_1$ from the cusp can
generate large quark mass hierarchies without fine-tuning. Furthermore CP
violation is induced by deviation of $\omega_2$ from imaginary axis.
|
[
{
"created": "Fri, 27 Oct 2023 08:48:51 GMT",
"version": "v1"
}
] |
2023-10-30
|
[
[
"Kikuchi",
"Shota",
""
],
[
"Kobayashi",
"Tatsuo",
""
],
[
"Nasu",
"Kaito",
""
],
[
"Takada",
"Shohei",
""
],
[
"Uchida",
"Hikaru",
""
]
] |
We study an approach to construct Siegel modular forms from $Sp(6,Z)$. Zero-mode wave functions on $T^6$ with magnetic flux background behave Siegel modular forms at the origin. Then $T$-symmetries partially break depending on the form of background magnetic flux. We study the background such that three $T$-symmetries $T_I$, $T_{II}$ and $T_{III}$ as well as the $S$-symmetry remain.Consequently, we obtain Siegel modular forms with three moduli parameters $(\omega_1,\omega_2,\omega_3)$, which are multiplets of finite modular groups. We show several examples. As one of examples, we study Siegel modular forms for $\widetilde{\Delta}(96)$ in detail. Then, as a phenomenological applicantion, we study quark flavor models using Siegel modular forms for $\widetilde{\Delta}(96)$. Around the cusp, $\omega_1=i\infty$, the Siegel modular forms have hierarchical values depending on their $T_I$-charges. We show the deviation of $\omega_1$ from the cusp can generate large quark mass hierarchies without fine-tuning. Furthermore CP violation is induced by deviation of $\omega_2$ from imaginary axis.
|
1307.1958
|
Ignasi Rosell
|
Antonio Pich, Ignasi Rosell and Juan Jose Sanz-Cillero
|
Strongly Coupled Models with a Higgs-like Boson
|
5 pages, 2 figures. Talk given at LHCP 2013, the Large Hadron
Collider Physics Conference, May 13-18th (2013), Barcelona (Spain)
| null |
10.1051/epjconf/20136019009
|
IFIC/13-38, FTUV/13-0708, FTUAM-13-18, IFT-UAM/CSIC-13-079
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Considering the one-loop calculation of the oblique S and T parameters, we
have presented a study of the viability of strongly-coupled scenarios of
electroweak symmetry breaking with a light Higgs-like boson. The calculation
has been done by using an effective Lagrangian, being short-distance
constraints and dispersive relations the main ingredients of the estimation.
Contrary to a widely spread believe, we have demonstrated that strongly coupled
electroweak models with massive resonances are not in conflict with
experimental constraints on these parameters and the recently observed
Higgs-like resonance. So there is room for these models, but they are
stringently constrained. The vector and axial-vector states should be heavy
enough (with masses above the TeV scale), the mass splitting between them is
highly preferred to be small and the Higgs-like scalar should have a WW
coupling close to the Standard Model one. It is important to stress that these
conclusions do not depend critically on the inclusion of the second Weinberg
sum rule.
|
[
{
"created": "Mon, 8 Jul 2013 06:41:26 GMT",
"version": "v1"
}
] |
2015-06-16
|
[
[
"Pich",
"Antonio",
""
],
[
"Rosell",
"Ignasi",
""
],
[
"Sanz-Cillero",
"Juan Jose",
""
]
] |
Considering the one-loop calculation of the oblique S and T parameters, we have presented a study of the viability of strongly-coupled scenarios of electroweak symmetry breaking with a light Higgs-like boson. The calculation has been done by using an effective Lagrangian, being short-distance constraints and dispersive relations the main ingredients of the estimation. Contrary to a widely spread believe, we have demonstrated that strongly coupled electroweak models with massive resonances are not in conflict with experimental constraints on these parameters and the recently observed Higgs-like resonance. So there is room for these models, but they are stringently constrained. The vector and axial-vector states should be heavy enough (with masses above the TeV scale), the mass splitting between them is highly preferred to be small and the Higgs-like scalar should have a WW coupling close to the Standard Model one. It is important to stress that these conclusions do not depend critically on the inclusion of the second Weinberg sum rule.
|
hep-ph/9905429
|
Stephen J. Puglia
|
M.J. Ramsey-Musolf
|
Electric Dipole Moments and the Mass Scale of New T-Violating,
P-Conserving Interactions
|
9 pages, 2 figures. To appear in PRL
|
Phys.Rev.Lett. 83 (1999) 3997-4000; Erratum-ibid. 84 (2000) 5681
|
10.1103/PhysRevLett.83.3997
| null |
hep-ph
| null |
We consider the implications of experimental limits on the permanent electric
dipole moment (EDM) of the electron and neutron for possible new
parity-conserving (PC) time-reversal violating (TV) interactions. We show that
the constraints derived from one-loop contributions to the EDM exceed
previously reported two-loop limits by more than an order of magnitude and
imply a lower bound on the new TVPC mass scale $\lamtv$ of 100 TeV for new TVPC
strong interactions. These results imply a value of $10^{-15}$ or smaller for
the ratio of low-energy TVPC matrix elements to those of the residual strong
interaction.
|
[
{
"created": "Thu, 20 May 1999 23:13:38 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Oct 1999 15:57:11 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Ramsey-Musolf",
"M. J.",
""
]
] |
We consider the implications of experimental limits on the permanent electric dipole moment (EDM) of the electron and neutron for possible new parity-conserving (PC) time-reversal violating (TV) interactions. We show that the constraints derived from one-loop contributions to the EDM exceed previously reported two-loop limits by more than an order of magnitude and imply a lower bound on the new TVPC mass scale $\lamtv$ of 100 TeV for new TVPC strong interactions. These results imply a value of $10^{-15}$ or smaller for the ratio of low-energy TVPC matrix elements to those of the residual strong interaction.
|
0710.2809
|
Barbara Mele
|
Barbara Mele
|
Rescuing H -> bb in VBF at the LHC by requiring a central photon
|
5 pages, 1 figure, invited talk at IFAE 2007, April 11-13, Naples,
Italy, to appear in the Proceedings
| null | null | null |
hep-ph
| null |
The LHC potential for a measurement of the Higgs boson coupling to the b
quark in the standard model is not well established yet. We show that requiring
a large transverse momentum photon in the light Higgs boson production via
vector-boson fusion (with subsequent H->bb decay) could provide a further
handle on the Hbb coupling determination, and on the measurement of the HWW
coupling as well.
|
[
{
"created": "Mon, 15 Oct 2007 13:33:05 GMT",
"version": "v1"
}
] |
2007-10-16
|
[
[
"Mele",
"Barbara",
""
]
] |
The LHC potential for a measurement of the Higgs boson coupling to the b quark in the standard model is not well established yet. We show that requiring a large transverse momentum photon in the light Higgs boson production via vector-boson fusion (with subsequent H->bb decay) could provide a further handle on the Hbb coupling determination, and on the measurement of the HWW coupling as well.
|
hep-ph/9211328
|
Osamu Yasuda
|
Kazuhito Iida, Hisakazu Minakata and Osamu Yasuda
|
A test of the equivalence principle by long-baseline
neutrino-oscillation experiments
|
LaTeX, 13 pages and 5 figures appended as PostScript files,
TMUP-HEL-9207
|
Mod. Phys. Lett. A8 (1993) 1037-1046
|
10.1142/S021773239300252X
| null |
hep-ph
| null |
We show that a breakdown of the universality of the gravitational couplings
to different neutrino flavors can be tested in long-baseline
neutrino-oscillation experiments. In particular we have analyzed in detail a
proposed experiment at SOUDAN 2 with $\nu_\mu$ beams from the Fermilab Main
Injector. It turns out that we can study both masses of neutrinos and such a
breakdown with sensitivity to the order of $10^{-14}$ by investigating the
energy spectrum of the resulting muons.
|
[
{
"created": "Sat, 28 Nov 1992 14:55:02 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"Iida",
"Kazuhito",
""
],
[
"Minakata",
"Hisakazu",
""
],
[
"Yasuda",
"Osamu",
""
]
] |
We show that a breakdown of the universality of the gravitational couplings to different neutrino flavors can be tested in long-baseline neutrino-oscillation experiments. In particular we have analyzed in detail a proposed experiment at SOUDAN 2 with $\nu_\mu$ beams from the Fermilab Main Injector. It turns out that we can study both masses of neutrinos and such a breakdown with sensitivity to the order of $10^{-14}$ by investigating the energy spectrum of the resulting muons.
|
hep-ph/0404237
|
Jose Santiago
|
S. A. Abel, J. Santiago
|
Constraining the string scale: from Planck to Weak and back again
|
Invited review aimed at an experimental audience
|
J.Phys.G30:R83-R111,2004
|
10.1088/0954-3899/30/3/R01
| null |
hep-ph hep-ex
| null |
String and field theory ideas have greatly influenced each other since the so
called second string revolution. We review this interrelation paying particular
attention to its phenomenological implications. Our guiding principle is the
radical shift in the way that we think about the fundamental scale, in
particular the way in which string models have been able to accommodate values
from the Planck $M_\mathrm{Pl}\sim 10^{18}$ GeV down to the electroweak scale
$M_{EW}\sim $ TeV.
|
[
{
"created": "Tue, 27 Apr 2004 12:11:50 GMT",
"version": "v1"
}
] |
2010-01-08
|
[
[
"Abel",
"S. A.",
""
],
[
"Santiago",
"J.",
""
]
] |
String and field theory ideas have greatly influenced each other since the so called second string revolution. We review this interrelation paying particular attention to its phenomenological implications. Our guiding principle is the radical shift in the way that we think about the fundamental scale, in particular the way in which string models have been able to accommodate values from the Planck $M_\mathrm{Pl}\sim 10^{18}$ GeV down to the electroweak scale $M_{EW}\sim $ TeV.
|
1110.1238
|
M. E. Carrington
|
M.E. Carrington
|
Transport Coefficients and nPI Methods
|
10 pages, 5 figures, contribution to the proceedings of the HIC for
FAIR Workshop and XXVIII Max Born Symposium "Three Days on Quarkyonic
Island," Wroclaw, May 19-21, 2011
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Transport coefficients can be obtained from 2-point correlators using the
Kubo formulae. It has been shown that the full leading order result for
electrical conductivity and (QCD) shear viscosity is contained in the re-summed
2-point function that is obtained from the 3-loop 3PI effective action. The
theory produces all leading order contributions without the necessity for power
counting, and in this sense it provides a natural framework for the calculation
and suggests that one can calculate the next-to-leading contribution to
transport coefficients from the 4-loop 4PI effective action. The integral
equations have been derived for shear viscosity for a scalar theory with cubic
and quartic interactions, with a non-vanishing field expectation value. We
review these results, and explain how the calculation could be done at higher
orders.
|
[
{
"created": "Thu, 6 Oct 2011 12:15:00 GMT",
"version": "v1"
}
] |
2011-10-07
|
[
[
"Carrington",
"M. E.",
""
]
] |
Transport coefficients can be obtained from 2-point correlators using the Kubo formulae. It has been shown that the full leading order result for electrical conductivity and (QCD) shear viscosity is contained in the re-summed 2-point function that is obtained from the 3-loop 3PI effective action. The theory produces all leading order contributions without the necessity for power counting, and in this sense it provides a natural framework for the calculation and suggests that one can calculate the next-to-leading contribution to transport coefficients from the 4-loop 4PI effective action. The integral equations have been derived for shear viscosity for a scalar theory with cubic and quartic interactions, with a non-vanishing field expectation value. We review these results, and explain how the calculation could be done at higher orders.
|
hep-ph/0607293
|
Christian Fischer
|
Reinhard Alkofer, Christian S. Fischer and Felipe J. Llanes-Estrada
|
Dynamically induced scalar quark confinement
|
12 pages, 2 figures; v2: clarifications added and typos corrected,
version to be published by MPLA
|
Mod.Phys.Lett.A23:1105-1113,2008
|
10.1142/S021773230802700X
| null |
hep-ph hep-lat hep-th nucl-th
| null |
We employ a functional approach to investigate the confinement problem in
quenched Landau gauge QCD. We demonstrate analytically that a linear rising
potential between massive quarks is generated by infrared singularities in the
dressed quark-gluon vertex. The selfconsistent mechanism that generates these
singularities is driven by the scalar Dirac amplitudes of the full vertex and
the quark propagator. These can only be present when chiral symmetry is broken.
We have thus uncovered a novel mechanism that directly links chiral symmetry
breaking with confinement.
|
[
{
"created": "Wed, 26 Jul 2006 14:50:52 GMT",
"version": "v1"
},
{
"created": "Wed, 7 May 2008 19:02:05 GMT",
"version": "v2"
}
] |
2010-10-27
|
[
[
"Alkofer",
"Reinhard",
""
],
[
"Fischer",
"Christian S.",
""
],
[
"Llanes-Estrada",
"Felipe J.",
""
]
] |
We employ a functional approach to investigate the confinement problem in quenched Landau gauge QCD. We demonstrate analytically that a linear rising potential between massive quarks is generated by infrared singularities in the dressed quark-gluon vertex. The selfconsistent mechanism that generates these singularities is driven by the scalar Dirac amplitudes of the full vertex and the quark propagator. These can only be present when chiral symmetry is broken. We have thus uncovered a novel mechanism that directly links chiral symmetry breaking with confinement.
|
1205.2752
|
Giulia Ricciardi
|
Giulia Ricciardi
|
CP violation with Bs
|
4 pages. To appear in Proceedings of Rencontres de Moriond, QCD and
High Energy Interactions, La Thuile, March 10-17, 2012
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The observation of CP violation effects is becoming more and more significant
in a variety of channels, due to the impressive experimental effort of the last
years. We review recent progress in Bs semileptonic decays and in Bs decays
into CP eigenstates.
|
[
{
"created": "Sat, 12 May 2012 08:17:11 GMT",
"version": "v1"
}
] |
2012-05-15
|
[
[
"Ricciardi",
"Giulia",
""
]
] |
The observation of CP violation effects is becoming more and more significant in a variety of channels, due to the impressive experimental effort of the last years. We review recent progress in Bs semileptonic decays and in Bs decays into CP eigenstates.
|
hep-ph/0005212
|
Gideon Alexander
|
Gideon Alexander and Edward Sarkisyan
|
The effect of many sources on the genuine multiparticle correlations
| null |
Phys.Lett. B487 (2000) 215-223
|
10.1016/S0370-2693(00)00820-0
|
TAUP 2630-2000
|
hep-ph
| null |
We report on a study aimed to explore the dependence of the genuine
multiparticle correlations on the number of sources when the influence of other
possible factors during multihadron production are avoided. The analysis
utilised the normalised cumulants calculated in three-dimensional phase space
of the reaction ee -> Z -> hadrons using a large Monte Carlo sample.
The multi-sources events were simulated by overlaying a few independent
single ee annihilation events.
It was found that as the number of sources increases, the cumulants do not
change significantly their structure, but those of an order higher than two
decrease fast in their magnitude.
This reduction and its amount can be understood in terms of combinatorial
considerations of source mixing which dilutes the correlations.
The diminishing of the genuine correlations is consistent with recent
cumulant measurements in hadron and nucleus induced reactions and should also
be relevant to other dynamical correlations like the Bose-Einstein one, in ee
-> WW -> hadrons and in nucleus-nucleus reactions.
|
[
{
"created": "Mon, 22 May 2000 07:12:25 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jun 2000 10:57:48 GMT",
"version": "v2"
},
{
"created": "Tue, 27 Jun 2000 06:54:33 GMT",
"version": "v3"
}
] |
2016-09-06
|
[
[
"Alexander",
"Gideon",
""
],
[
"Sarkisyan",
"Edward",
""
]
] |
We report on a study aimed to explore the dependence of the genuine multiparticle correlations on the number of sources when the influence of other possible factors during multihadron production are avoided. The analysis utilised the normalised cumulants calculated in three-dimensional phase space of the reaction ee -> Z -> hadrons using a large Monte Carlo sample. The multi-sources events were simulated by overlaying a few independent single ee annihilation events. It was found that as the number of sources increases, the cumulants do not change significantly their structure, but those of an order higher than two decrease fast in their magnitude. This reduction and its amount can be understood in terms of combinatorial considerations of source mixing which dilutes the correlations. The diminishing of the genuine correlations is consistent with recent cumulant measurements in hadron and nucleus induced reactions and should also be relevant to other dynamical correlations like the Bose-Einstein one, in ee -> WW -> hadrons and in nucleus-nucleus reactions.
|
hep-ph/0402078
|
Peter Zeiler Skands
|
T. Sj\"ostrand and P. Skands
|
Multiple Interactions and the Structure of Beam Remnants
|
69pp, 33 figures
|
JHEP 0403:053,2004
|
10.1088/1126-6708/2004/03/053
|
LU-TP-04-08
|
hep-ph
| null |
Recent experimental data have established some of the basic features of
multiple interactions in hadron-hadron collisions. The emphasis is therefore
now shifting, to one of exploring more detailed aspects. Starting from a brief
review of the current situation, a next-generation model is developed, wherein
a detailed account is given of correlated flavour, colour, longitudinal and
transverse momentum distributions, encompassing both the partons initiating
perturbative interactions and the partons left in the beam remnants. Some of
the main features are illustrated for the Tevatron and the LHC.
|
[
{
"created": "Sat, 7 Feb 2004 22:40:24 GMT",
"version": "v1"
},
{
"created": "Wed, 19 May 2004 13:05:28 GMT",
"version": "v2"
}
] |
2009-12-15
|
[
[
"Sjöstrand",
"T.",
""
],
[
"Skands",
"P.",
""
]
] |
Recent experimental data have established some of the basic features of multiple interactions in hadron-hadron collisions. The emphasis is therefore now shifting, to one of exploring more detailed aspects. Starting from a brief review of the current situation, a next-generation model is developed, wherein a detailed account is given of correlated flavour, colour, longitudinal and transverse momentum distributions, encompassing both the partons initiating perturbative interactions and the partons left in the beam remnants. Some of the main features are illustrated for the Tevatron and the LHC.
|
1812.09682
|
Martin Rohrmoser
|
Martin Rohrmoser, Pol Gossiaux, Thierry Gousset, Joerg Aichelin, Iurii
Karpenko
|
Effects of jet-medium interactions on angular correlations of
jet-particle pairs at different energy scales
|
proceedings for a seminar talk at the "Hard Probes 2018" conference
in Aix Les Bains, 4 pages, 1 figure
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The energy-loss of hard probes within the hot and dense medium of a quark
gluon plasma (QGP) can be described by theoretical models based on radiative
energy loss as well as combinations of collisional and radiative energy loss.
In a search for observables that allow to disentangle these energy-loss
mechanisms, we introduced a set of effective models that allows to investigate
the consequences on jets of both types of jet-medium interactions within a
consistent framework. We particularly studied angular jet-broadening via
angular two-particle correlations. Distinguishing contributions from pairs at
different scales of particle momenta, we found qualitative differences between
radiative and collisional approaches.
|
[
{
"created": "Sun, 23 Dec 2018 10:09:14 GMT",
"version": "v1"
}
] |
2018-12-27
|
[
[
"Rohrmoser",
"Martin",
""
],
[
"Gossiaux",
"Pol",
""
],
[
"Gousset",
"Thierry",
""
],
[
"Aichelin",
"Joerg",
""
],
[
"Karpenko",
"Iurii",
""
]
] |
The energy-loss of hard probes within the hot and dense medium of a quark gluon plasma (QGP) can be described by theoretical models based on radiative energy loss as well as combinations of collisional and radiative energy loss. In a search for observables that allow to disentangle these energy-loss mechanisms, we introduced a set of effective models that allows to investigate the consequences on jets of both types of jet-medium interactions within a consistent framework. We particularly studied angular jet-broadening via angular two-particle correlations. Distinguishing contributions from pairs at different scales of particle momenta, we found qualitative differences between radiative and collisional approaches.
|
2302.03324
|
Duc Ninh Le
|
Thi Nhung Dao, Duc Ninh Le
|
Enhancing the doubly-longitudinal polarization in WZ production at the
LHC
|
13 pages, 3 figures, 3 tables. arXiv admin note: text overlap with
arXiv:2208.09232
| null | null | null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We present new results for the theoretical prediction of doubly-polarized
cross sections of $WZ$ events at the LHC using leptonic decays. Compared to the
previous studies, two new kinematic cuts are considered. These cuts are
designed to enhance the doubly-longitudinal (LL) polarization and, at the same
time, study the Radiation Amplitude Zero effect. We found a new cut on the
rapidity separation between the $Z$ boson and the electron from the $W$ decay
which makes the LL fraction largest, namely $|\Delta y_{Z,e}| < 0.5$. This
result is obtained at the next-to-leading order in the strong and electroweak
couplings.
|
[
{
"created": "Tue, 7 Feb 2023 09:04:07 GMT",
"version": "v1"
}
] |
2023-02-08
|
[
[
"Dao",
"Thi Nhung",
""
],
[
"Le",
"Duc Ninh",
""
]
] |
We present new results for the theoretical prediction of doubly-polarized cross sections of $WZ$ events at the LHC using leptonic decays. Compared to the previous studies, two new kinematic cuts are considered. These cuts are designed to enhance the doubly-longitudinal (LL) polarization and, at the same time, study the Radiation Amplitude Zero effect. We found a new cut on the rapidity separation between the $Z$ boson and the electron from the $W$ decay which makes the LL fraction largest, namely $|\Delta y_{Z,e}| < 0.5$. This result is obtained at the next-to-leading order in the strong and electroweak couplings.
|
hep-ph/9703341
|
Kiselev
|
A.V.Berezhnoy, V.V.Kiselev, A.K.Likhoded, A.I.Onischenko
|
$B_c$ Meson at LHC
|
27 pages, Latex file, epsf-style, 6 ps-figures
|
Phys.Atom.Nucl.60:1729-1740,1997; Yad.Fiz.60N10:1889-1900.1997
| null |
IHEP 97-2
|
hep-ph
| null |
In the framework of perturbative QCD and potential models of heavy
quarkonium, total cross-sections and differential characteristics of hadronic
production for different spin states of the $B_c$-meson family are calculated
at energies of LHC. Theoretical predictions for masses and branching ratios of
$B_c$ decays are given, which allows one to make estimates for an expected
number of reconstructed events with $B_c$.
|
[
{
"created": "Mon, 17 Mar 1997 15:58:05 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Berezhnoy",
"A. V.",
""
],
[
"Kiselev",
"V. V.",
""
],
[
"Likhoded",
"A. K.",
""
],
[
"Onischenko",
"A. I.",
""
]
] |
In the framework of perturbative QCD and potential models of heavy quarkonium, total cross-sections and differential characteristics of hadronic production for different spin states of the $B_c$-meson family are calculated at energies of LHC. Theoretical predictions for masses and branching ratios of $B_c$ decays are given, which allows one to make estimates for an expected number of reconstructed events with $B_c$.
|
hep-ph/0102133
|
Vadim Guzey
|
V. Guzey (Adelaide U.), K. Saito (Tohoku Coll., Pharmacy), M. Strikman
(Penn State U.), A.W. Thomas and K. Tsushima (Adelaide U.)
|
Non-singlet structure function of the 3He-3H system and divergence of
the Gottfried integral
|
29 pages, 6 figures, RevTex
|
Phys.Rev.D64:054503,2001
|
10.1103/PhysRevD.64.054503
|
ADP-01-03/T438
|
hep-ph hep-ex nucl-ex nucl-th
| null |
We study shadowing and antishadowing corrections to the flavor non-singlet
structure function F_2(3He)-F_2(3H) and show that the difference between the
one-particle density distributions of 3He and 3H plays an important role at
very small x. We find that the flavor non-singlet structure function in these
mirror nuclei is enhanced at small x by nuclear shadowing, which increases the
nuclear Gottfried integral, integrated from 10^{-4} to 1, by 11-36 %. When
integrated from zero, the Gottfried integral is divergent for these mirror
nuclei. It seems likely that, as a consequence of charge symmetry breaking,
this may also apply to the proton-neutron system.
|
[
{
"created": "Mon, 12 Feb 2001 00:22:35 GMT",
"version": "v1"
}
] |
2010-02-17
|
[
[
"Guzey",
"V.",
"",
"Adelaide U."
],
[
"Saito",
"K.",
"",
"Tohoku Coll., Pharmacy"
],
[
"Strikman",
"M.",
"",
"Penn State U."
],
[
"Thomas",
"A. W.",
"",
"Adelaide U."
],
[
"Tsushima",
"K.",
"",
"Adelaide U."
]
] |
We study shadowing and antishadowing corrections to the flavor non-singlet structure function F_2(3He)-F_2(3H) and show that the difference between the one-particle density distributions of 3He and 3H plays an important role at very small x. We find that the flavor non-singlet structure function in these mirror nuclei is enhanced at small x by nuclear shadowing, which increases the nuclear Gottfried integral, integrated from 10^{-4} to 1, by 11-36 %. When integrated from zero, the Gottfried integral is divergent for these mirror nuclei. It seems likely that, as a consequence of charge symmetry breaking, this may also apply to the proton-neutron system.
|
0907.0949
|
Andrea Achilli
|
A. Achilli, R. Godbole, A. Grau, G. Pancheri, Y.N. Srivastava
|
QCD Mini-jet contribution to the total cross section
|
7 pages, 3 figures, presented at MPI08, Perugia, October 27-31, 2008
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the predictions of a model for proton-proton total cross-section
at LHC. It takes into account both hard partonic processes and soft gluon
emission effects to describe the proper high energy behavior and to respect the
Froissart bound.
|
[
{
"created": "Mon, 6 Jul 2009 09:49:41 GMT",
"version": "v1"
}
] |
2009-07-07
|
[
[
"Achilli",
"A.",
""
],
[
"Godbole",
"R.",
""
],
[
"Grau",
"A.",
""
],
[
"Pancheri",
"G.",
""
],
[
"Srivastava",
"Y. N.",
""
]
] |
We present the predictions of a model for proton-proton total cross-section at LHC. It takes into account both hard partonic processes and soft gluon emission effects to describe the proper high energy behavior and to respect the Froissart bound.
|
1302.0960
|
Satyanarayan Mukhopadhyay
|
Kaoru Hagiwara, Satyanarayan Mukhopadhyay
|
Azimuthal correlation among jets produced in association with a bottom
or top quark pair at the LHC
|
15 pages, 5 figures; v2: minor additions to text, references added,
version as published in JHEP
|
JHEP05(2013)019
|
10.1007/JHEP05(2013)019
|
KEK-TH-1597, IPMU 13-0025
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Angular correlation of jets produced in association with a massive scalar,
vector or tensor boson is crucial in the determination of their spin and CP
properties. We study jet angular correlations in events with a high mass bottom
quark pair or a top quark pair and two jets at the LHC, whose cross-section is
dominated by the virtual gluon fusion sub-processes when appropriate kinematic
selection cuts (vector-boson fusion cuts) are applied. We evaluate helicity
amplitudes for sub-processes initiated by qq, qg and gg collisions in the limit
where the intermediate gluons are collinear to the initial partons. We first
obtain a general expression for the azimuthal angle correlations among the
dijets and t t-bar or b b-bar, in terms of the gg to t t-bar or b b-bar
helicity amplitudes in the real gluon approximation of the full matrix
elements, and find simple analytic expressions in the two kinematic limits, the
production of a heavy quark pair near the threshold, and in the relativistic
limit where the invariant mass of the heavy quark pair is much larger than the
quark mass. For b b-bar + 2 jets we find strong azimuthal angle correlations
which are distinct from those expected for events with a CP-even or odd scalar
boson which may decay into a b b-bar pair. For t t-bar + 2 jets we find that
the angular correlations are similar to that of a CP-odd scalar+2 jets near the
threshold M_(t t-bar) ~ 2 m_t, while in the relativistic limit they resemble
the distribution for b b-bar + 2 jets. These correlations in the standard QCD
processes will help establish the experimental technique to measure the spin
and CP properties of new particles produced via gluon fusion at the LHC.
|
[
{
"created": "Tue, 5 Feb 2013 08:46:42 GMT",
"version": "v1"
},
{
"created": "Tue, 7 May 2013 07:39:39 GMT",
"version": "v2"
}
] |
2013-05-08
|
[
[
"Hagiwara",
"Kaoru",
""
],
[
"Mukhopadhyay",
"Satyanarayan",
""
]
] |
Angular correlation of jets produced in association with a massive scalar, vector or tensor boson is crucial in the determination of their spin and CP properties. We study jet angular correlations in events with a high mass bottom quark pair or a top quark pair and two jets at the LHC, whose cross-section is dominated by the virtual gluon fusion sub-processes when appropriate kinematic selection cuts (vector-boson fusion cuts) are applied. We evaluate helicity amplitudes for sub-processes initiated by qq, qg and gg collisions in the limit where the intermediate gluons are collinear to the initial partons. We first obtain a general expression for the azimuthal angle correlations among the dijets and t t-bar or b b-bar, in terms of the gg to t t-bar or b b-bar helicity amplitudes in the real gluon approximation of the full matrix elements, and find simple analytic expressions in the two kinematic limits, the production of a heavy quark pair near the threshold, and in the relativistic limit where the invariant mass of the heavy quark pair is much larger than the quark mass. For b b-bar + 2 jets we find strong azimuthal angle correlations which are distinct from those expected for events with a CP-even or odd scalar boson which may decay into a b b-bar pair. For t t-bar + 2 jets we find that the angular correlations are similar to that of a CP-odd scalar+2 jets near the threshold M_(t t-bar) ~ 2 m_t, while in the relativistic limit they resemble the distribution for b b-bar + 2 jets. These correlations in the standard QCD processes will help establish the experimental technique to measure the spin and CP properties of new particles produced via gluon fusion at the LHC.
|
2312.05992
|
Tisa Biswas
|
Tisa Biswas
|
Probing the Interactions of Axion-Like Particles with Electroweak Bosons
and the Higgs Boson in the High Energy Regime at LHC
|
33 pages, 16 figures, 7 Tables; version accepted for publication in
JHEP
|
JHEP 05 (2024) 081
|
10.1007/JHEP05(2024)081
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We study the interactions of Axion-Like Particles (ALPs) with the Standard
Model particles, aiming to probe their phenomenology via non-resonant searches
at the LHC. These interactions are mediated by higher dimensional effective
operators within two possible frameworks of linearly and non-linearly realised
electroweak symmetry breaking. We consider the ALPs to be light enough to be
produced on-shell and exploit their derivative couplings with the SM Higgs
boson and the gauge bosons. We will use the high momentum transfer processes,
namely $hZ, Z\gamma, WW$ and $WW\gamma$ production from $pp$ collisions. We
derive upper limits on the gauge-invariant interactions of ALPs with the
electroweak bosons and/or Higgs boson that contribute to these processes, from
the re-interpretation of the latest Run 2 available LHC data. The constraints
we obtain are strong for ALP masses below 100 GeV. These allowed effective
interactions in the ALP parameter space yield better significance at HL-LHC and
thus, offer promising avenues for subsequent studies. Furthermore, we augment
our cut-based analysis with gradient-boosted decision trees, which improve the
statistical significance distinctly across these interaction channels. We
briefly compare the results with the complementary probe of these couplings via
direct production of ALPs in association with the Higgs boson or a vector
boson.
|
[
{
"created": "Sun, 10 Dec 2023 20:41:40 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Apr 2024 17:54:52 GMT",
"version": "v2"
}
] |
2024-05-09
|
[
[
"Biswas",
"Tisa",
""
]
] |
We study the interactions of Axion-Like Particles (ALPs) with the Standard Model particles, aiming to probe their phenomenology via non-resonant searches at the LHC. These interactions are mediated by higher dimensional effective operators within two possible frameworks of linearly and non-linearly realised electroweak symmetry breaking. We consider the ALPs to be light enough to be produced on-shell and exploit their derivative couplings with the SM Higgs boson and the gauge bosons. We will use the high momentum transfer processes, namely $hZ, Z\gamma, WW$ and $WW\gamma$ production from $pp$ collisions. We derive upper limits on the gauge-invariant interactions of ALPs with the electroweak bosons and/or Higgs boson that contribute to these processes, from the re-interpretation of the latest Run 2 available LHC data. The constraints we obtain are strong for ALP masses below 100 GeV. These allowed effective interactions in the ALP parameter space yield better significance at HL-LHC and thus, offer promising avenues for subsequent studies. Furthermore, we augment our cut-based analysis with gradient-boosted decision trees, which improve the statistical significance distinctly across these interaction channels. We briefly compare the results with the complementary probe of these couplings via direct production of ALPs in association with the Higgs boson or a vector boson.
|
hep-ph/0102248
|
Christof Wetterich
|
C.Wetterich
|
Phase transition between three- and two-flavor QCD?
|
published version, new section on heavy quark potential,29
pages,LaTex
| null | null |
HD-THEP-01-09
|
hep-ph
| null |
We explore the possibility that QCD may undergo a phase transition as a
function of the strange quark mass. This would hint towards models with
``spontaneous color symmetry breaking'' in the vacuum. For two light quark
flavors we classify possible colored quark-antiquark, diquark and gluon
condensates that are compatible with a spectrum of integer charged states and
conserved isospin and baryon number. The ``quark mass phase transition'' would
be linked to an unusual realization of baryon number in QCD$_2$ and could be
tested in lattice simulations. We emphasize, however, that at the present stage
the Higgs picture of the vacuum cannot predict a quark mass phase transition -
a smooth crossover remains as a realistic alternative. Implications of the
Higgs picture for the high density phase transition in QCD$_2$ suggest that
this transition is characterized by the spontaneous breaking of isospin for
nuclear and quark matter.
|
[
{
"created": "Tue, 20 Feb 2001 13:25:09 GMT",
"version": "v1"
},
{
"created": "Mon, 5 May 2003 11:02:32 GMT",
"version": "v2"
}
] |
2016-09-06
|
[
[
"Wetterich",
"C.",
""
]
] |
We explore the possibility that QCD may undergo a phase transition as a function of the strange quark mass. This would hint towards models with ``spontaneous color symmetry breaking'' in the vacuum. For two light quark flavors we classify possible colored quark-antiquark, diquark and gluon condensates that are compatible with a spectrum of integer charged states and conserved isospin and baryon number. The ``quark mass phase transition'' would be linked to an unusual realization of baryon number in QCD$_2$ and could be tested in lattice simulations. We emphasize, however, that at the present stage the Higgs picture of the vacuum cannot predict a quark mass phase transition - a smooth crossover remains as a realistic alternative. Implications of the Higgs picture for the high density phase transition in QCD$_2$ suggest that this transition is characterized by the spontaneous breaking of isospin for nuclear and quark matter.
|
1604.00335
|
Bj\"orn Schenke
|
Francois Gelis and Bjoern Schenke
|
Initial State Quantum Fluctuations in the Little Bang
|
17 pages, 9 figures, Manuscript accepted by Annual Reviews of Nuclear
and Particle Science
| null |
10.1146/annurev-nucl-102115-044651
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review recent developments in the ab-initio theoretical description of the
initial state in heavy-ion collisions. We emphasize the importance of
fluctuations, both for the phenomenological description of experimental data
from the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider
(LHC), and the theoretical understanding of the non-equilibrium early time
dynamics and thermalization of the medium.
|
[
{
"created": "Fri, 1 Apr 2016 17:38:48 GMT",
"version": "v1"
}
] |
2016-11-23
|
[
[
"Gelis",
"Francois",
""
],
[
"Schenke",
"Bjoern",
""
]
] |
We review recent developments in the ab-initio theoretical description of the initial state in heavy-ion collisions. We emphasize the importance of fluctuations, both for the phenomenological description of experimental data from the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC), and the theoretical understanding of the non-equilibrium early time dynamics and thermalization of the medium.
|
hep-ph/9608258
|
Geoffrey B. West
|
Geoffrey B. West
|
The Glueball; The Fundamental Particle of Non-Perturbative QCD
|
14 pages. Talk given at the Montpelier Conference and Paris Workshop
on QCD
| null | null | null |
hep-ph
| null |
Theoretical ideas related to the existence of glueballs in QCD are reviewed.
These include non-perturbative phenomena such as confinement, instantons,
vacuum condensates and renormalons. We also discuss glueball dominance of the
trace of the stress-tensor, the mass content of the nucleon and a theorem on
the lightest glueball state.
|
[
{
"created": "Wed, 7 Aug 1996 20:46:54 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"West",
"Geoffrey B.",
""
]
] |
Theoretical ideas related to the existence of glueballs in QCD are reviewed. These include non-perturbative phenomena such as confinement, instantons, vacuum condensates and renormalons. We also discuss glueball dominance of the trace of the stress-tensor, the mass content of the nucleon and a theorem on the lightest glueball state.
|
1108.0661
|
Juan Gonzalez-Fraile
|
O.J.P. Eboli, J. Gonzalez-Fraile and M.C. Gonzalez-Garcia
|
Neutrino Masses at LHC: Minimal Lepton Flavour Violation in Type-III
See-saw
|
31 pages, 11 Figures, matches published version
| null |
10.1007/JHEP12(2011)009
|
YITP-SB-11-28 ICCUB-11-163
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the signatures of minimal lepton flavour violation in a simple
Type-III see - saw model in which the flavour scale is given by the new fermion
triplet mass and it can be naturally light enough to be produced at the LHC. In
this model the flavour structure of the lepton number conserving couplings of
the triplet fermions to the Standard Model leptons can be reconstructed from
the neutrino mass matrix and the smallness of the neutrino mass is associated
with a tiny violation of total lepton number. Characteristic signatures of this
model include suppressed lepton number violation decays of the triplet
fermions, absence of displaced vertices in their decays and predictable lepton
flavour composition of the states produced in their decays. We study the
observability of these signals in the processes $pp\rightarrow 3\ell + 2j
+\Sla{E_T}$ and $pp\rightarrow 2\ell + 4j$ with $\ell =e$ or $\mu$ taking into
account the present low energy data on neutrino physics and the corresponding
Standard Model backgrounds. Our results indicate that the new fermionic states
can be observed for masses up to 500 GeV depending on the CP violating Majorana
phase for an integrated luminosity of 30 fb$^{-1}$. Moreover, the flavour of
the final state leptons in the above processes can shed light on the neutrino
mass ordering.
|
[
{
"created": "Tue, 2 Aug 2011 20:00:00 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Nov 2011 11:18:35 GMT",
"version": "v2"
}
] |
2015-05-30
|
[
[
"Eboli",
"O. J. P.",
""
],
[
"Gonzalez-Fraile",
"J.",
""
],
[
"Gonzalez-Garcia",
"M. C.",
""
]
] |
We study the signatures of minimal lepton flavour violation in a simple Type-III see - saw model in which the flavour scale is given by the new fermion triplet mass and it can be naturally light enough to be produced at the LHC. In this model the flavour structure of the lepton number conserving couplings of the triplet fermions to the Standard Model leptons can be reconstructed from the neutrino mass matrix and the smallness of the neutrino mass is associated with a tiny violation of total lepton number. Characteristic signatures of this model include suppressed lepton number violation decays of the triplet fermions, absence of displaced vertices in their decays and predictable lepton flavour composition of the states produced in their decays. We study the observability of these signals in the processes $pp\rightarrow 3\ell + 2j +\Sla{E_T}$ and $pp\rightarrow 2\ell + 4j$ with $\ell =e$ or $\mu$ taking into account the present low energy data on neutrino physics and the corresponding Standard Model backgrounds. Our results indicate that the new fermionic states can be observed for masses up to 500 GeV depending on the CP violating Majorana phase for an integrated luminosity of 30 fb$^{-1}$. Moreover, the flavour of the final state leptons in the above processes can shed light on the neutrino mass ordering.
|
1702.07288
|
G\"oran F\"aldt
|
G\"oran F\"aldt, Andrzej Kupsc
|
Hadronic structure functions in the $e^+ e^- \rightarrow \bar{\Lambda}
\Lambda$ reaction
|
4 pages, 3 figures
| null |
10.1016/j.physletb.2017.06.011
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Cross-section distributions are calculated for the reaction $e^+ e^-
\rightarrow J/\psi\rightarrow \bar{\Lambda}(\rightarrow \bar{p}\pi^+)
\Lambda(\rightarrow p\pi^-)$, and related annihilation reactions mediated by
vector mesons. The hyperon-decay distributions depend on a number of structure
functions that are bilinear in the, possibly complex, psionic form factors
$G_M^\psi$ and $G_E^\psi$ of the Lambda hyperon. The relative size and relative
phase of these form factors can be uniquely determined from the unpolarized
joint-decay distributions of the Lambda and anti-Lambda hyperons. Also the
decay-asymmetry parameters of Lambda and anti-Lambda hyperons can be
determined.
|
[
{
"created": "Thu, 23 Feb 2017 16:51:37 GMT",
"version": "v1"
},
{
"created": "Mon, 15 May 2017 12:49:00 GMT",
"version": "v2"
}
] |
2017-06-14
|
[
[
"Fäldt",
"Göran",
""
],
[
"Kupsc",
"Andrzej",
""
]
] |
Cross-section distributions are calculated for the reaction $e^+ e^- \rightarrow J/\psi\rightarrow \bar{\Lambda}(\rightarrow \bar{p}\pi^+) \Lambda(\rightarrow p\pi^-)$, and related annihilation reactions mediated by vector mesons. The hyperon-decay distributions depend on a number of structure functions that are bilinear in the, possibly complex, psionic form factors $G_M^\psi$ and $G_E^\psi$ of the Lambda hyperon. The relative size and relative phase of these form factors can be uniquely determined from the unpolarized joint-decay distributions of the Lambda and anti-Lambda hyperons. Also the decay-asymmetry parameters of Lambda and anti-Lambda hyperons can be determined.
|
0811.2728
|
Stefan Groote
|
S. Groote, J.G. K\"orner
|
Analytical results for O(\alpha_s) radiative corrections to e+ e- ->
tbar t(pol.) up to a given gluon energy cut
|
49 pages in LaTeX, including 17 encapsulated PostScript figures
|
Physical Review D80(3) (2009) 034001
|
10.1103/PhysRevD.80.034001
|
MZ-TH/98-23
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We determine the O(\alpha_s) radiative corrections to polarized top quark
pair production in e+ e- -annihilations with a specified gluon energy cut. We
write down fully analytical results for the unpolarized and polarized
O(\alpha_s) cross sections e+ e- -> tbar t (G) and e+ e- -> tbar t(pol.) (G)
including their polar orientation dependence relative to the beam direction. In
the soft gluon limit we recover the usual factorizing form known from the soft
gluon approximation. In the limit when the gluon energy cut takes its maximum
value we recover the totally inclusive unpolarized and polarized cross sections
calculated previously. We provide some numerical results on the cut-off
dependence of the various polarized and unpolarized cross sections and discuss
how the exact results numerically differ from the approximate soft-gluon
results.
|
[
{
"created": "Mon, 17 Nov 2008 15:34:30 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Aug 2009 09:33:49 GMT",
"version": "v2"
}
] |
2009-08-05
|
[
[
"Groote",
"S.",
""
],
[
"Körner",
"J. G.",
""
]
] |
We determine the O(\alpha_s) radiative corrections to polarized top quark pair production in e+ e- -annihilations with a specified gluon energy cut. We write down fully analytical results for the unpolarized and polarized O(\alpha_s) cross sections e+ e- -> tbar t (G) and e+ e- -> tbar t(pol.) (G) including their polar orientation dependence relative to the beam direction. In the soft gluon limit we recover the usual factorizing form known from the soft gluon approximation. In the limit when the gluon energy cut takes its maximum value we recover the totally inclusive unpolarized and polarized cross sections calculated previously. We provide some numerical results on the cut-off dependence of the various polarized and unpolarized cross sections and discuss how the exact results numerically differ from the approximate soft-gluon results.
|
hep-ph/9902405
|
B. Ananthanarayan
|
B. Ananthanarayan (Bangalore), and P. N. Pandita (Hamburg, Shillong)
|
Infra-red stable fixed points of R-parity violating Yukawa couplings in
supersymmetric models
|
Plain latex to be run twice, 12 pages. Replaced with version to
appear in Physics Letters B
|
Phys.Lett. B454 (1999) 84-91
|
10.1016/S0370-2693(99)00322-6
|
DESY 99-019, IISc-CTS-3/99
|
hep-ph
| null |
We investigate the infra-red stable fixed points of the Yukawa couplings in
the minimal version of the supersymmetric standard model with R-parity
violation. Retaining only the R-parity violating couplings of higher
generations, we analytically study the solutions of the renormalization group
equations of these couplings together with the top- and b-quark Yukawa
couplings. We show that only the B-violating coupling $\lambda^{''}_{233}$
approaches a non-trivial infra-red stable fixed point, whereas all other
non-trivial fixed point solutions are either unphysical or unstable in the
infra-red region. However, this fixed point solution predicts a top-quark
Yukawa coupling which is incompatible with the top quark mass for any value of
$\tan\beta$.
|
[
{
"created": "Fri, 19 Feb 1999 16:13:54 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Feb 1999 03:56:14 GMT",
"version": "v2"
},
{
"created": "Tue, 30 Mar 1999 09:32:08 GMT",
"version": "v3"
}
] |
2009-10-31
|
[
[
"Ananthanarayan",
"B.",
"",
"Bangalore"
],
[
"Pandita",
"P. N.",
"",
"Hamburg, Shillong"
]
] |
We investigate the infra-red stable fixed points of the Yukawa couplings in the minimal version of the supersymmetric standard model with R-parity violation. Retaining only the R-parity violating couplings of higher generations, we analytically study the solutions of the renormalization group equations of these couplings together with the top- and b-quark Yukawa couplings. We show that only the B-violating coupling $\lambda^{''}_{233}$ approaches a non-trivial infra-red stable fixed point, whereas all other non-trivial fixed point solutions are either unphysical or unstable in the infra-red region. However, this fixed point solution predicts a top-quark Yukawa coupling which is incompatible with the top quark mass for any value of $\tan\beta$.
|
hep-ph/9702362
|
Robert D. Pisarski
|
Robert D. Pisarski, T.L. Trueman and Michel H.G. Tytgat
|
How pi0 -> gamma gamma changes with temperature
|
12 pages, ReVTeX, 4 figures, to be published in Phys. Rev. D. New
section 5 with proof of the Adler-Bardeen theorem at low T
|
Phys.Rev.D56:7077-7088,1997
|
10.1103/PhysRevD.56.7077
| null |
hep-ph nucl-th
| null |
At zero temperature, in the chiral limit the amplitude for pi0 to decay into
two photons is directly related to the coefficient of the axial anomaly. At any
nonzero temperature, this direct relationship is lost: while the coefficient of
the axial anomaly is independent of temperature, in a thermal bath the
anomalous Ward identities do not uniquely constrain the amplitude for pi0 ->
gamma gamma. Explicit calculation shows that to lowest order about zero
temperature, this amplitude decreases.
|
[
{
"created": "Tue, 18 Feb 1997 19:12:25 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Jul 1997 18:52:08 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Pisarski",
"Robert D.",
""
],
[
"Trueman",
"T. L.",
""
],
[
"Tytgat",
"Michel H. G.",
""
]
] |
At zero temperature, in the chiral limit the amplitude for pi0 to decay into two photons is directly related to the coefficient of the axial anomaly. At any nonzero temperature, this direct relationship is lost: while the coefficient of the axial anomaly is independent of temperature, in a thermal bath the anomalous Ward identities do not uniquely constrain the amplitude for pi0 -> gamma gamma. Explicit calculation shows that to lowest order about zero temperature, this amplitude decreases.
|
hep-ph/9904356
|
Borisov
|
A.V.Borisov and P.E.Sizin
|
Propagation of axions in a strongly magnetized medium
|
RevTex, no figures, 13 pages, Revised version of the paper published
in J. Exp. Theor. Phys. {\bf 88}, 1 (1999)
|
J.Exp.Theor.Phys. 88 (1999) 1-5; Zh.Eksp.Teor.Fiz. 115 (1999) 3-11
|
10.1134/1.558755
| null |
hep-ph
| null |
The polarization operator of an axion in a degenerate gas of electrons
occupying the ground-state Landau level in a superstrong magnetic field $H\gg
H_0=m_e^2c^3/e\hbar =4.41\cdot 10^{13}$ G is investigated in a model with a
tree-level axion-electron coupling. It is shown that a dynamic axion mass,
which can fall within the allowed range of values $(10^{-5} eV \lesssim
m_a\lesssim 10^{-2} eV)$, is generated under the conditions of strongly
magnetized neutron stars. As a result, the dispersion relation for axions is
appreciably different from that in a vacuum.
|
[
{
"created": "Fri, 16 Apr 1999 07:31:52 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Borisov",
"A. V.",
""
],
[
"Sizin",
"P. E.",
""
]
] |
The polarization operator of an axion in a degenerate gas of electrons occupying the ground-state Landau level in a superstrong magnetic field $H\gg H_0=m_e^2c^3/e\hbar =4.41\cdot 10^{13}$ G is investigated in a model with a tree-level axion-electron coupling. It is shown that a dynamic axion mass, which can fall within the allowed range of values $(10^{-5} eV \lesssim m_a\lesssim 10^{-2} eV)$, is generated under the conditions of strongly magnetized neutron stars. As a result, the dispersion relation for axions is appreciably different from that in a vacuum.
|
0904.2213
|
Pavel Fileviez Perez
|
Pavel Fileviez Perez, Sogee Spinner
|
Spontaneous R-Parity Breaking in SUSY Models
|
9 pages, typos corrected, to appear in Physical Review D
|
Phys.Rev.D80:015004,2009
|
10.1103/PhysRevD.80.015004
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate a mechanism for spontaneous R-parity breaking in a class of
extensions of the minimal supersymmetric standard model with an extra Abelian
gauge symmetry which is a linear combination of B-L and weak hypercharge. Both
U(1)_X and R-parity are broken by the vacuum expectation value of the
right-handed sneutrinos which is proportional to the soft SUSY masses. In these
models the mechanism for spontaneous R-parity violation can be realized even
with positive soft masses. In this context one has a realistic mechanism for
generating neutrino masses as well as a realistic spectrum. We briefly discuss
the possible collider signals which could be used to test the theory, the
contributions for proton decay and the possibility of a gravitino as a dark
matter candidate.
|
[
{
"created": "Tue, 14 Apr 2009 22:10:26 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jun 2009 16:02:24 GMT",
"version": "v2"
}
] |
2009-07-10
|
[
[
"Perez",
"Pavel Fileviez",
""
],
[
"Spinner",
"Sogee",
""
]
] |
We investigate a mechanism for spontaneous R-parity breaking in a class of extensions of the minimal supersymmetric standard model with an extra Abelian gauge symmetry which is a linear combination of B-L and weak hypercharge. Both U(1)_X and R-parity are broken by the vacuum expectation value of the right-handed sneutrinos which is proportional to the soft SUSY masses. In these models the mechanism for spontaneous R-parity violation can be realized even with positive soft masses. In this context one has a realistic mechanism for generating neutrino masses as well as a realistic spectrum. We briefly discuss the possible collider signals which could be used to test the theory, the contributions for proton decay and the possibility of a gravitino as a dark matter candidate.
|
hep-ph/0512340
|
Jiri Chyla
|
Jiri Chyla
|
On higher order corrections to photon structure functions
|
14 pages, 2 eps figures, couple of typos and misprints corrected
| null | null | null |
hep-ph
| null |
The QCD corrections to photon structure functions are defined in a way
consistent with the factorization scheme invariance. It is shown that the
conventional DIS$_{\gamma}$ factorization scheme does not respect this
invariance and is thus deeply flawed. The origins of the divergent behavior of
photonic coefficient function at large $x$ are analyzed and recipe to remove it
is suggested.
|
[
{
"created": "Tue, 27 Dec 2005 15:36:07 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Jan 2006 13:01:30 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Chyla",
"Jiri",
""
]
] |
The QCD corrections to photon structure functions are defined in a way consistent with the factorization scheme invariance. It is shown that the conventional DIS$_{\gamma}$ factorization scheme does not respect this invariance and is thus deeply flawed. The origins of the divergent behavior of photonic coefficient function at large $x$ are analyzed and recipe to remove it is suggested.
|
1011.6470
|
Alfredo Aranda
|
Alfredo Aranda, Cesar Bonilla, Raymundo Ramos, Alma D. Rojas
|
A renormalizable fermion mass model with the double tetrahedral group
|
14 pages, 2 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a renormalizable model for fermion masses based solely on the
double tetrahedral group T'. It does not include right handed neutrinos and
majorana neutrino masses are generated radiatively. The scalar sector of the
model involves three SU(2) doublets and a set of lepton number violating
(charged) scalars needed to give mass to the neutrinos. In the quark sector the
model leads to a Fritzsch type scenario that is consistent with all the
existing data. In the lepton sector, the model leads to tribimaximal (and near
tribimaximal) mixing, and an inverted mass hierarchy.
|
[
{
"created": "Tue, 30 Nov 2010 06:59:12 GMT",
"version": "v1"
}
] |
2010-12-01
|
[
[
"Aranda",
"Alfredo",
""
],
[
"Bonilla",
"Cesar",
""
],
[
"Ramos",
"Raymundo",
""
],
[
"Rojas",
"Alma D.",
""
]
] |
We present a renormalizable model for fermion masses based solely on the double tetrahedral group T'. It does not include right handed neutrinos and majorana neutrino masses are generated radiatively. The scalar sector of the model involves three SU(2) doublets and a set of lepton number violating (charged) scalars needed to give mass to the neutrinos. In the quark sector the model leads to a Fritzsch type scenario that is consistent with all the existing data. In the lepton sector, the model leads to tribimaximal (and near tribimaximal) mixing, and an inverted mass hierarchy.
|
hep-ph/0612314
|
Carlos Luis Schat
|
Dan Pirjol and Carlos Schat
|
Positive parity pentaquark towers in large Nc QCD
|
21 pages, 2 figures, 5 tables
|
Phys.Rev.D75:076004,2007
|
10.1103/PhysRevD.75.076004
| null |
hep-ph
| null |
We construct the complete set of positive parity pentaquarks, which
correspond in the quark model to {\bar s} q^{Nc+1} states with one unit of
orbital angular momentum L=1. In the large Nc limit they fall into the K=1/2
and K=3/2 irreps (towers) of the contracted SU(4)c symmetry. We derive
predictions for the mass spectrum and the axial couplings of these states at
leading order in 1/Nc. The strong decay width of the lowest-lying positive
parity exotic state is of order O(1/Nc), such that this state is narrow in the
large Nc limit. Replacing the antiquark with a heavy antiquark {\bar Q}
q^{Nc+1}, the two towers become degenerate, split only by O(1/mQ) hyperfine
interactions. We obtain predictions for the strong decay widths of heavy
pentaquarks to ordinary baryons and heavy H(*)_{\bar Q} mesons at leading order
in 1/Nc and 1/mQ.
|
[
{
"created": "Fri, 22 Dec 2006 20:04:30 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Pirjol",
"Dan",
""
],
[
"Schat",
"Carlos",
""
]
] |
We construct the complete set of positive parity pentaquarks, which correspond in the quark model to {\bar s} q^{Nc+1} states with one unit of orbital angular momentum L=1. In the large Nc limit they fall into the K=1/2 and K=3/2 irreps (towers) of the contracted SU(4)c symmetry. We derive predictions for the mass spectrum and the axial couplings of these states at leading order in 1/Nc. The strong decay width of the lowest-lying positive parity exotic state is of order O(1/Nc), such that this state is narrow in the large Nc limit. Replacing the antiquark with a heavy antiquark {\bar Q} q^{Nc+1}, the two towers become degenerate, split only by O(1/mQ) hyperfine interactions. We obtain predictions for the strong decay widths of heavy pentaquarks to ordinary baryons and heavy H(*)_{\bar Q} mesons at leading order in 1/Nc and 1/mQ.
|
hep-ph/9709512
| null |
John McDonald
|
Spontaneous Discrete Symmetry Breaking During Inflation and the NMSSM
Domain Wall Problem
|
LaTex, 30 pages, revised version
|
Nucl.Phys. B530 (1998) 325-345
|
10.1016/S0550-3213(98)00414-3
| null |
hep-ph
| null |
The Next to Minimal Supersymmetric Standard Model (NMSSM), proposed as a
solution of the mu problem of the Minimal Supersymmetric Standard Model, has a
discrete Z_{3} symmetry which is spontaneously broken at the electroweak phase
transition, resulting in a cosmological domain wall problem. In most cases this
domain wall problem cannot be solved by explicit Z_{3} breaking without
introducing supergravity tadpole corrections which destabilize the weak scale
hierarchy. Here we consider the possibility of solving the domain wall problem
of the NMSSM via spontaneous discrete symmetry breaking occuring during
inflation. For the case where the discrete symmetry breaking field has
renormalizible couplings to the NMSSM fields, we find that the couplings must
be less than 10^{-5} if the reheating temperature is larger than 10^{7}GeV, but
can be up to 10^{-3} for reheating temperatures of the order of the electroweak
phase transition temperature. For the case of non-renormalizible couplings, we
present a model which can solve the domain wall problem for large reheating
temperatures without requiring any very small coupling constants.
In this model the domain walls are eliminated by a pressure coming from their
interaction with a coherently oscillating scalar field whose phase is fixed
during inflation.
This oscillating scalar field typically decays after the electroweak phase
transition but before nucleosynthesis, leaving no additional
Z_{3} symmetry breaking in the zero-temperature theory.
|
[
{
"created": "Tue, 30 Sep 1997 19:22:45 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Oct 1997 13:04:48 GMT",
"version": "v2"
},
{
"created": "Thu, 2 Apr 1998 09:50:25 GMT",
"version": "v3"
}
] |
2016-09-06
|
[
[
"McDonald",
"John",
""
]
] |
The Next to Minimal Supersymmetric Standard Model (NMSSM), proposed as a solution of the mu problem of the Minimal Supersymmetric Standard Model, has a discrete Z_{3} symmetry which is spontaneously broken at the electroweak phase transition, resulting in a cosmological domain wall problem. In most cases this domain wall problem cannot be solved by explicit Z_{3} breaking without introducing supergravity tadpole corrections which destabilize the weak scale hierarchy. Here we consider the possibility of solving the domain wall problem of the NMSSM via spontaneous discrete symmetry breaking occuring during inflation. For the case where the discrete symmetry breaking field has renormalizible couplings to the NMSSM fields, we find that the couplings must be less than 10^{-5} if the reheating temperature is larger than 10^{7}GeV, but can be up to 10^{-3} for reheating temperatures of the order of the electroweak phase transition temperature. For the case of non-renormalizible couplings, we present a model which can solve the domain wall problem for large reheating temperatures without requiring any very small coupling constants. In this model the domain walls are eliminated by a pressure coming from their interaction with a coherently oscillating scalar field whose phase is fixed during inflation. This oscillating scalar field typically decays after the electroweak phase transition but before nucleosynthesis, leaving no additional Z_{3} symmetry breaking in the zero-temperature theory.
|
1412.1485
|
Wei Xue
|
Jia Liu, Neal Weiner and Wei Xue
|
Signals of a Light Dark Force in the Galactic Center
|
39 pages, 14 figures, references updated and discussion of CMB
constraints included
|
JHEP 08 (2015) 050
|
10.1007/JHEP08(2015)050
|
MIT-CTP/4616, MITP/14-100
|
hep-ph astro-ph.GA astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recent evidence for an excess of gamma rays in the GeV energy range about the
Galactic Center have refocused attention on models of dark matter in the low
mass regime ($m_\chi \lesssim m_Z/2$). Because this is an experimentally
well-trod energy range, it can be a challenge to develop simple models that
explain this excess, consistent with other experimental constraints. We
reconsider models where the dark matter couples to dark photon, which has a
weak kinetic mixing to the Standard Model photon, or scalars with a weak mixing
with the Higgs boson. We focus on the light ($\lesssim 1.5 GeV$) dark mediator
mass regime. Annihilations into the dark mediators can produce observable gamma
rays through decays to $\pi^0$, through radiative processes when decaying to
charged particles ($e^+e^-, \mu^+\mu^-,...$), and subsequent interactions of
high energy $e^+e^-$ with gas and light. However, these models have no signals
of $\bar p$ production, which is kinematically forbidden. We find that in these
models, the shape of resulting gamma-ray spectrum can provide a good fit to the
excess at Galactic Center. We discuss further constraints from AMS-02, and find
regions of compatibility.
|
[
{
"created": "Wed, 3 Dec 2014 21:03:16 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jun 2015 23:24:59 GMT",
"version": "v2"
}
] |
2015-08-21
|
[
[
"Liu",
"Jia",
""
],
[
"Weiner",
"Neal",
""
],
[
"Xue",
"Wei",
""
]
] |
Recent evidence for an excess of gamma rays in the GeV energy range about the Galactic Center have refocused attention on models of dark matter in the low mass regime ($m_\chi \lesssim m_Z/2$). Because this is an experimentally well-trod energy range, it can be a challenge to develop simple models that explain this excess, consistent with other experimental constraints. We reconsider models where the dark matter couples to dark photon, which has a weak kinetic mixing to the Standard Model photon, or scalars with a weak mixing with the Higgs boson. We focus on the light ($\lesssim 1.5 GeV$) dark mediator mass regime. Annihilations into the dark mediators can produce observable gamma rays through decays to $\pi^0$, through radiative processes when decaying to charged particles ($e^+e^-, \mu^+\mu^-,...$), and subsequent interactions of high energy $e^+e^-$ with gas and light. However, these models have no signals of $\bar p$ production, which is kinematically forbidden. We find that in these models, the shape of resulting gamma-ray spectrum can provide a good fit to the excess at Galactic Center. We discuss further constraints from AMS-02, and find regions of compatibility.
|
2006.11217
|
William J. Torres Bobadilla Dr.
|
J. Jesus Aguilera-Verdugo, Roger J. Hernandez-Pinto, German Rodrigo,
German F. R. Sborlini, William J. Torres Bobadilla
|
Causal representation of multi-loop Feynman integrands within the
loop-tree duality
|
24 pages, 8 figures. v2: references added; matches published version
| null |
10.1007/JHEP01(2021)069
|
IFIC/20-27
|
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
The numerical evaluation of multi-loop scattering amplitudes in the Feynman
representation usually requires to deal with both physical (causal) and
unphysical (non-causal) singularities. The loop-tree duality (LTD) offers a
powerful framework to easily characterise and distinguish these two types of
singularities, and then simplify analytically the underling expressions. In
this paper, we work explicitly on the dual representation of multi-loop Feynman
integrals generated from three parent topologies, which we refer to as Maximal,
Next-to-Maximal and Next-to-Next-to-Maximal loop topologies. In particular, we
aim at expressing these dual contributions, independently of the number of
loops and internal configurations, in terms of causal propagators only. Thus,
providing very compact and causal integrand representations to all orders. In
order to do so, we reconstruct their analytic expressions from numerical
evaluation over finite fields. This procedure implicitly cancels out all
unphysical singularities. We also interpret the result in terms of entangled
causal thresholds. In view of the simple structure of the dual expressions, we
integrate them numerically up to four loops in integer space-time dimensions,
taking advantage of their smooth behaviour at integrand level.
|
[
{
"created": "Fri, 19 Jun 2020 16:42:36 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Jun 2021 16:08:33 GMT",
"version": "v2"
}
] |
2021-06-23
|
[
[
"Aguilera-Verdugo",
"J. Jesus",
""
],
[
"Hernandez-Pinto",
"Roger J.",
""
],
[
"Rodrigo",
"German",
""
],
[
"Sborlini",
"German F. R.",
""
],
[
"Bobadilla",
"William J. Torres",
""
]
] |
The numerical evaluation of multi-loop scattering amplitudes in the Feynman representation usually requires to deal with both physical (causal) and unphysical (non-causal) singularities. The loop-tree duality (LTD) offers a powerful framework to easily characterise and distinguish these two types of singularities, and then simplify analytically the underling expressions. In this paper, we work explicitly on the dual representation of multi-loop Feynman integrals generated from three parent topologies, which we refer to as Maximal, Next-to-Maximal and Next-to-Next-to-Maximal loop topologies. In particular, we aim at expressing these dual contributions, independently of the number of loops and internal configurations, in terms of causal propagators only. Thus, providing very compact and causal integrand representations to all orders. In order to do so, we reconstruct their analytic expressions from numerical evaluation over finite fields. This procedure implicitly cancels out all unphysical singularities. We also interpret the result in terms of entangled causal thresholds. In view of the simple structure of the dual expressions, we integrate them numerically up to four loops in integer space-time dimensions, taking advantage of their smooth behaviour at integrand level.
|
2204.12542
|
Jo\~ao Pedro Pino Gon\c{c}alves
|
Felipe F. Freitas and Jo\~ao Gon\c{c}alves and Ant\'onio P. Morais and
Roman Pasechnik
|
Phenomenology at the Large Hadron Collider with Deep Learning: the case
of vector-like quarks decaying to light jets
|
24 pages, 4 tables and 8 figures. Matches version to be published in
EPJC
| null |
10.1140/epjc/s10052-022-10799-8
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In this work, we continue our exploration of TeV-scale vector-like fermion
signatures inspired by a Grand Unification scenario based on the trinification
gauge group. A particular focus is given to pair-production topologies of
vector-like quarks (VLQs) at the LHC, in a multi-jet plus a charged lepton and
a missing energy signature. We employ Deep Learning methods and techniques
based in evolutive algorithms that optimize hyper-parameters in the neural
network construction, whose objective is to maximise the Asimov estimate for
distinct VLQ masses. In this article, we consider the implications of an
innovative approach by simultaneously combining detector images (also known as
jet images) and tabular data containing kinematic information from the final
states. With this technique we are able to exclude VLQs, that are specific for
the considered model, to up a mass of 800 GeV in both the high-luminosity the
Run-III phases of the LHC programme.
|
[
{
"created": "Tue, 26 Apr 2022 18:50:02 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Aug 2022 13:56:16 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Sep 2022 08:15:22 GMT",
"version": "v3"
}
] |
2022-09-28
|
[
[
"Freitas",
"Felipe F.",
""
],
[
"Gonçalves",
"João",
""
],
[
"Morais",
"António P.",
""
],
[
"Pasechnik",
"Roman",
""
]
] |
In this work, we continue our exploration of TeV-scale vector-like fermion signatures inspired by a Grand Unification scenario based on the trinification gauge group. A particular focus is given to pair-production topologies of vector-like quarks (VLQs) at the LHC, in a multi-jet plus a charged lepton and a missing energy signature. We employ Deep Learning methods and techniques based in evolutive algorithms that optimize hyper-parameters in the neural network construction, whose objective is to maximise the Asimov estimate for distinct VLQ masses. In this article, we consider the implications of an innovative approach by simultaneously combining detector images (also known as jet images) and tabular data containing kinematic information from the final states. With this technique we are able to exclude VLQs, that are specific for the considered model, to up a mass of 800 GeV in both the high-luminosity the Run-III phases of the LHC programme.
|
2011.08053
|
Amin Aboubrahim
|
Amin Aboubrahim, Michael Klasen, and Pran Nath
|
Xenon-1T excess as a possible signal of a sub-GeV hidden sector dark
matter
|
21 pages, 4 figures, 1 table. Accepted for publication in JHEP
| null |
10.1007/JHEP02(2021)229
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We present a particle physics model to explain the observed enhancement in
the Xenon-1T data at an electron recoil energy of 2.5 keV. The model is based
on a $U(1)$ extension of the Standard Model where the dark sector consists of
two essentially mass degenerate Dirac fermions in the sub-GeV region with a
small mass splitting interacting with a dark photon. The dark photon is
unstable and decays before the big bang nucleosynthesis, which leads to the
dark matter constituted of two essentially mass degenerate Dirac fermions. The
Xenon-1T excess is computed via the inelastic exothermic scattering of the
heavier dark fermion from a bound electron in xenon to the lighter dark fermion
producing the observed excess events in the recoil electron energy. The model
can be tested with further data from Xenon-1T and in future experiments such as
SuperCDMS.
|
[
{
"created": "Mon, 16 Nov 2020 16:06:48 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Jan 2021 20:40:46 GMT",
"version": "v2"
}
] |
2021-03-17
|
[
[
"Aboubrahim",
"Amin",
""
],
[
"Klasen",
"Michael",
""
],
[
"Nath",
"Pran",
""
]
] |
We present a particle physics model to explain the observed enhancement in the Xenon-1T data at an electron recoil energy of 2.5 keV. The model is based on a $U(1)$ extension of the Standard Model where the dark sector consists of two essentially mass degenerate Dirac fermions in the sub-GeV region with a small mass splitting interacting with a dark photon. The dark photon is unstable and decays before the big bang nucleosynthesis, which leads to the dark matter constituted of two essentially mass degenerate Dirac fermions. The Xenon-1T excess is computed via the inelastic exothermic scattering of the heavier dark fermion from a bound electron in xenon to the lighter dark fermion producing the observed excess events in the recoil electron energy. The model can be tested with further data from Xenon-1T and in future experiments such as SuperCDMS.
|
1610.08549
|
Zhongwen Feng
|
Zhong-Wen Feng, Shu-Zheng Yang, Hui-Ling Li, Xiao-Tao Zu
|
Constraining the generalized uncertainty principle with the
gravitational wave event GW150914
|
8 pages, 2 Tables
|
Physics Letters B 768 (2017) 81-85
|
10.1016/j.physletb.2017.02.043
| null |
hep-ph gr-qc hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
In this letter, we show that the dimensionless parameter in the generalized
uncertainty principle (GUP) can be constrained by the gravitational wave event
GW150914, which was discovered by the LIGO Scientific and Virgo Collaborations.
Firstly, according to the Heisenberg uncertainty principle (HUP) and the data
of gravitational wave event GW150914, we derive the standard energy-momentum
dispersion relation and calculate the difference between the propagation speed
of gravitons and the speed of light, i.e., $\Delta \upsilon$. Next, using two
proposals regarding the GUP, we also generalize our study to the quantum
gravity case and obtain the modified speed of gravitons. Finally, based on the
modified speed of gravitons and $\Delta \upsilon$, the improved upper bounds on
the GUP parameters are obtained. The results show that the upper limits of the
GUP parameters $\beta_0$ and $\alpha_0$ are $2.3 \times 10^ {60}$ and $1.8
\times 10^{20}$.
|
[
{
"created": "Sat, 22 Oct 2016 10:08:14 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Nov 2016 13:01:05 GMT",
"version": "v2"
},
{
"created": "Fri, 17 Feb 2017 03:25:06 GMT",
"version": "v3"
},
{
"created": "Fri, 3 Mar 2017 07:07:02 GMT",
"version": "v4"
}
] |
2017-03-06
|
[
[
"Feng",
"Zhong-Wen",
""
],
[
"Yang",
"Shu-Zheng",
""
],
[
"Li",
"Hui-Ling",
""
],
[
"Zu",
"Xiao-Tao",
""
]
] |
In this letter, we show that the dimensionless parameter in the generalized uncertainty principle (GUP) can be constrained by the gravitational wave event GW150914, which was discovered by the LIGO Scientific and Virgo Collaborations. Firstly, according to the Heisenberg uncertainty principle (HUP) and the data of gravitational wave event GW150914, we derive the standard energy-momentum dispersion relation and calculate the difference between the propagation speed of gravitons and the speed of light, i.e., $\Delta \upsilon$. Next, using two proposals regarding the GUP, we also generalize our study to the quantum gravity case and obtain the modified speed of gravitons. Finally, based on the modified speed of gravitons and $\Delta \upsilon$, the improved upper bounds on the GUP parameters are obtained. The results show that the upper limits of the GUP parameters $\beta_0$ and $\alpha_0$ are $2.3 \times 10^ {60}$ and $1.8 \times 10^{20}$.
|
0903.4978
|
Joan Sola
|
Nicolas Bernal, David Lopez-Val, Joan Sola
|
Single Higgs-boson production through gamma-gamma scattering within the
general 2HDM
|
References and comments added. Accepted in Phys. Lett. B
|
Phys.Lett.B677:39-47,2009
|
10.1016/j.physletb.2009.05.013
|
UB-ECM-PF-09/06
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The production of a single neutral Higgs boson h through (loop-induced)
gamma-gamma collisions is explored in the context of the linear colliders
within the general Two-Higgs-Doublet Model (2HDM). Two different mechanisms are
analyzed: on the one hand, the scattering gamma gamma-> h of two real photons
in a gamma-gamma collider; on the other, the more traditional mechanism of
virtual photon fusion, e+e- -->e+e- + h. Owing to the peculiar properties of
the Higgs boson self-interactions within the general 2HDM, we find that the
overall production rates can be boosted up significantly, provided the charged
Higgs mass is not too heavy. For example, if the latter is slightly above 100
GeV and, in addition, the lightest CP-even Higgs boson falls in the ballpark of
the LEP bound on the SM Higgs mass up to a few hundred GeV, the cross-sections
may typically render \sigma(gamma gamma-> h)= 0.1-1 pb and \sigma(e+e- --> e+e-
+ h)\sim 0.01 pb -- in both cases well above the SM prediction. Although for
charged Higgs masses above 300 GeV the rates become virtually insensitive to
the Higgs boson self-couplings, a significant tail of non-SM effects produced
by the combined contribution of the Yukawa couplings and gauge bosons could
still reveal a smoking gun.
|
[
{
"created": "Sat, 28 Mar 2009 17:44:07 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Apr 2009 19:40:42 GMT",
"version": "v2"
},
{
"created": "Thu, 7 May 2009 07:02:20 GMT",
"version": "v3"
}
] |
2014-11-18
|
[
[
"Bernal",
"Nicolas",
""
],
[
"Lopez-Val",
"David",
""
],
[
"Sola",
"Joan",
""
]
] |
The production of a single neutral Higgs boson h through (loop-induced) gamma-gamma collisions is explored in the context of the linear colliders within the general Two-Higgs-Doublet Model (2HDM). Two different mechanisms are analyzed: on the one hand, the scattering gamma gamma-> h of two real photons in a gamma-gamma collider; on the other, the more traditional mechanism of virtual photon fusion, e+e- -->e+e- + h. Owing to the peculiar properties of the Higgs boson self-interactions within the general 2HDM, we find that the overall production rates can be boosted up significantly, provided the charged Higgs mass is not too heavy. For example, if the latter is slightly above 100 GeV and, in addition, the lightest CP-even Higgs boson falls in the ballpark of the LEP bound on the SM Higgs mass up to a few hundred GeV, the cross-sections may typically render \sigma(gamma gamma-> h)= 0.1-1 pb and \sigma(e+e- --> e+e- + h)\sim 0.01 pb -- in both cases well above the SM prediction. Although for charged Higgs masses above 300 GeV the rates become virtually insensitive to the Higgs boson self-couplings, a significant tail of non-SM effects produced by the combined contribution of the Yukawa couplings and gauge bosons could still reveal a smoking gun.
|
2102.03050
|
Zhi-zhong Xing
|
Zhi-zhong Xing
|
A translational flavor symmetry in the mass terms of Dirac and Majorana
fermions
|
15 pages. A proof is given to show that the translation of a massless
neutrino field, which assures the Dirac equation to be invariant, is
equivalent to the translational transformations of three neutrino flavor
states in the flavor space as a consequence of flavor mixing. More
discussions are added. Accepted for publication in JPG
| null |
10.1088/1361-6471/ac421e
| null |
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
Requiring the effective mass term for a category of fundamental Dirac or
Majorana fermions of the same electric charge to be invariant under the
translational transformations $\psi^{}_{\alpha \rm L (R)} \to \psi^{}_{\alpha
\rm L (R)} + n^{}_{\alpha} z^{}_{\psi \rm L(R)}$ in the flavor space, where
$n^{}_\alpha$ and $z^{}_{\psi \rm L(R)}$ stand respectively for the
flavor-dependent complex numbers and a constant spinor field anticommuting with
the fermion fields, we show that $n^{}_\alpha$ can be identified as the
elements $U^{}_{\alpha i}$ in the $i$-th column of the unitary matrix $U$ used
to diagonalize the corresponding Hermitian or symmetric fermion mass matrix
$M^{}_\psi$, and $m^{}_i = 0$ holds accordingly. We find that the reverse is
also true. Now that the mass spectra of charged leptons, up- and down-type
quarks are all strongly hierarchical and current experimental data allow the
lightest neutrino to be massless, we argue that the zero mass limit for the
first-family fermions and the translational flavor symmetry behind it should be
a natural starting point for building viable fermion mass models.
|
[
{
"created": "Fri, 5 Feb 2021 08:24:28 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Dec 2021 08:29:18 GMT",
"version": "v2"
}
] |
2022-01-19
|
[
[
"Xing",
"Zhi-zhong",
""
]
] |
Requiring the effective mass term for a category of fundamental Dirac or Majorana fermions of the same electric charge to be invariant under the translational transformations $\psi^{}_{\alpha \rm L (R)} \to \psi^{}_{\alpha \rm L (R)} + n^{}_{\alpha} z^{}_{\psi \rm L(R)}$ in the flavor space, where $n^{}_\alpha$ and $z^{}_{\psi \rm L(R)}$ stand respectively for the flavor-dependent complex numbers and a constant spinor field anticommuting with the fermion fields, we show that $n^{}_\alpha$ can be identified as the elements $U^{}_{\alpha i}$ in the $i$-th column of the unitary matrix $U$ used to diagonalize the corresponding Hermitian or symmetric fermion mass matrix $M^{}_\psi$, and $m^{}_i = 0$ holds accordingly. We find that the reverse is also true. Now that the mass spectra of charged leptons, up- and down-type quarks are all strongly hierarchical and current experimental data allow the lightest neutrino to be massless, we argue that the zero mass limit for the first-family fermions and the translational flavor symmetry behind it should be a natural starting point for building viable fermion mass models.
|
hep-ph/9608330
|
Gregory Gabadadze
|
Glennys R. Farrar and G.T. Gabadadze (Rutgers Univ.)
|
Light Gluino Mass and Condensate from Properties of $\eta$ and $\eta'$
|
14 pages, LATEX file, 1 PS fig. Some discussions are added, to be
published in Phys. Lett. B
|
Phys.Lett. B397 (1997) 104-111
|
10.1016/S0370-2693(97)00151-2
| null |
hep-ph
| null |
We investigate whether known properties of the $\eta'$ meson are consistent
with its being the Goldstone boson of the spontaneously broken anomaly-free R
symmetry required in the light gluino scenario. We fit the masses and $2\gamma$
decays of the $\eta$ and $\eta'$ mesons, and also their production in radiative
$J/\psi$ decays. We find that the $\eta-\eta'$ system is well-described in the
light gluino scenario, if $m_\lambda\simeq (84-144) MeV$ and
$<{\bar\lambda}\lambda> \simeq -(0.15-0.36) GeV^3$. These values are in the
range expected when the gluino gets its mass entirely from radiative
corrections.
|
[
{
"created": "Thu, 15 Aug 1996 02:07:13 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Feb 1997 22:09:01 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Farrar",
"Glennys R.",
"",
"Rutgers Univ."
],
[
"Gabadadze",
"G. T.",
"",
"Rutgers Univ."
]
] |
We investigate whether known properties of the $\eta'$ meson are consistent with its being the Goldstone boson of the spontaneously broken anomaly-free R symmetry required in the light gluino scenario. We fit the masses and $2\gamma$ decays of the $\eta$ and $\eta'$ mesons, and also their production in radiative $J/\psi$ decays. We find that the $\eta-\eta'$ system is well-described in the light gluino scenario, if $m_\lambda\simeq (84-144) MeV$ and $<{\bar\lambda}\lambda> \simeq -(0.15-0.36) GeV^3$. These values are in the range expected when the gluino gets its mass entirely from radiative corrections.
|
2207.07737
|
Tom Steudtner
|
Gudrun Hiller, Tim H\"ohne, Daniel F. Litim, Tom Steudtner
|
Portals into Higgs vacuum stability
|
18 pages, 16 figures. v2: match published version
| null |
10.1103/PhysRevD.106.115004
|
DO-TH 21/08
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We address the notorious metastability of the standard model (SM) and promote
it to a model building task: What are the new ingredients required to stabilize
the SM up to the Planck scale without encountering subplanckian Landau poles?
Using the SM extended by vector-like fermions (VLFs), we chart out the
corresponding landscape of Higgs stability. We find that the gauge portal
mechanism, triggered by new SM charge carriers, opens up sizeable room for
stability in a minimally invasive manner. We also find models with Higgs
criticality, and Yukawa portals opening up at stronger coupling. Several models
allow for VLFs in the TeV-range, which can be searched for at the LHC. For
nontrivial flavor structure severe flavor-changing neutral current constraints
arise which complement those from stability, and push lower fermion masses up
to $\mathcal{O}(10^3\,\text{TeV})$.
|
[
{
"created": "Fri, 15 Jul 2022 20:22:35 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Nov 2022 20:02:39 GMT",
"version": "v2"
}
] |
2022-12-14
|
[
[
"Hiller",
"Gudrun",
""
],
[
"Höhne",
"Tim",
""
],
[
"Litim",
"Daniel F.",
""
],
[
"Steudtner",
"Tom",
""
]
] |
We address the notorious metastability of the standard model (SM) and promote it to a model building task: What are the new ingredients required to stabilize the SM up to the Planck scale without encountering subplanckian Landau poles? Using the SM extended by vector-like fermions (VLFs), we chart out the corresponding landscape of Higgs stability. We find that the gauge portal mechanism, triggered by new SM charge carriers, opens up sizeable room for stability in a minimally invasive manner. We also find models with Higgs criticality, and Yukawa portals opening up at stronger coupling. Several models allow for VLFs in the TeV-range, which can be searched for at the LHC. For nontrivial flavor structure severe flavor-changing neutral current constraints arise which complement those from stability, and push lower fermion masses up to $\mathcal{O}(10^3\,\text{TeV})$.
|
2211.08838
|
Melih Arslan Ozcelik
|
Samuel Abreu, Matteo Becchetti, Claude Duhr, Melih A. Ozcelik
|
Two-loop form factors for pseudo-scalar quarkonium production and decay
|
37 pages, 1 figure, v2: version published in JHEP
| null |
10.1007/JHEP02(2023)250
|
BONN-TH-2022-23, CERN-TH-2022-187, TTP22-068
|
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the analytic expressions for the two-loop form factors for the
production or decay of pseudo-scalar quarkonia, in a scheme where the quarks
are produced at threshold. We consider the two-loop amplitude for the process
$\gamma \gamma \leftrightarrow {^1S_0^{[1]}}$, that was previously known only
numerically, as well as for the processes $gg \leftrightarrow {^1S_0^{[1]}}$,
$\gamma g \leftrightarrow {^1S_0^{[8]}}$ and $gg \leftrightarrow
{^1S_0^{[8]}}$, which have not been computed before. The two-loop corrections
to $gg \leftrightarrow {^1S_0^{[1]}}$ are the last missing ingredients for a
full NNLO calculation of $\eta_Q$ hadro-production. We discuss how the
singularity structure of the amplitudes is affected by the threshold
kinematics, which in particular introduces Coulomb singularities. In this
context, we first show how the usual structure of the infrared singularities
degenerates at threshold kinematics, and then extract the anomalous dimensions
governing the Coulomb singularities for colour-singlet and octet channels, the
latter being presented here for the first time. We give high-precision
numerical results for the hard functions, which can be used for
phenomenological studies of $\eta_Q$ production and decay at NNLO.
|
[
{
"created": "Wed, 16 Nov 2022 11:27:26 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Mar 2023 10:49:27 GMT",
"version": "v2"
}
] |
2023-03-22
|
[
[
"Abreu",
"Samuel",
""
],
[
"Becchetti",
"Matteo",
""
],
[
"Duhr",
"Claude",
""
],
[
"Ozcelik",
"Melih A.",
""
]
] |
We present the analytic expressions for the two-loop form factors for the production or decay of pseudo-scalar quarkonia, in a scheme where the quarks are produced at threshold. We consider the two-loop amplitude for the process $\gamma \gamma \leftrightarrow {^1S_0^{[1]}}$, that was previously known only numerically, as well as for the processes $gg \leftrightarrow {^1S_0^{[1]}}$, $\gamma g \leftrightarrow {^1S_0^{[8]}}$ and $gg \leftrightarrow {^1S_0^{[8]}}$, which have not been computed before. The two-loop corrections to $gg \leftrightarrow {^1S_0^{[1]}}$ are the last missing ingredients for a full NNLO calculation of $\eta_Q$ hadro-production. We discuss how the singularity structure of the amplitudes is affected by the threshold kinematics, which in particular introduces Coulomb singularities. In this context, we first show how the usual structure of the infrared singularities degenerates at threshold kinematics, and then extract the anomalous dimensions governing the Coulomb singularities for colour-singlet and octet channels, the latter being presented here for the first time. We give high-precision numerical results for the hard functions, which can be used for phenomenological studies of $\eta_Q$ production and decay at NNLO.
|
hep-ph/0311028
|
Larry McLerran
|
Larry McLerran
|
The Quark Gluon Plasma and The Color Glass Condensate: 4 Lectures
| null | null | null | null |
hep-ph
| null |
The purpose of these lectures is to provide an introduction to the physics
issues which are being studied in the RHIC heavy ion program. These center
around the production of new states of matter. The Quark Gluon Plasma is
thermal matter which once existed in the big bang which may be made at RHIC.
The Color Glass Condensate is a universal form of matter which controls the
high energy limit of strong interactions. Both such forms of matter might be
produced and probed at RHIC.
|
[
{
"created": "Mon, 3 Nov 2003 19:00:45 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"McLerran",
"Larry",
""
]
] |
The purpose of these lectures is to provide an introduction to the physics issues which are being studied in the RHIC heavy ion program. These center around the production of new states of matter. The Quark Gluon Plasma is thermal matter which once existed in the big bang which may be made at RHIC. The Color Glass Condensate is a universal form of matter which controls the high energy limit of strong interactions. Both such forms of matter might be produced and probed at RHIC.
|
1512.05617
|
Fredy Ochoa
|
R. Martinez, F. Ochoa, C.F. Sierra
|
Diphoton decay for a $750$ GeV scalar boson in an $U(1)_{X}$ model
|
5 figures, discussion extended, 2 new figures
| null |
10.1016/j.nuclphysb.2016.09.004
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the context of a nonuniversal and anomaly free $U(1)_{X}$ extension of the
standard model, we examine the decay of a $750$GeV scalar singlet state,
$\xi_{\chi}$, as a possible explanation of the observed diphoton excess
announced by the ATLAS and CMS collaborations at CERN-LHC collider. One-loop
decay to photons is allowed through three heavy singlet quarks and one charged
Higgs boson into the loop. We obtain, for different width approximations and
for masses of the exotic singlet quarks in the region $[900,\,3000]$ GeV, a
production cross section $\sigma(pp\to\xi_{\chi}\to\gamma\gamma)$ compatible
with ATLAS and CMS collaborations data. We also include another scalar singlet,
$\sigma$, as a dark matter candidate that may couple with the 750 GeV scalar at
tree level with production cross sections in agreement with ATLAS and CMS.
|
[
{
"created": "Thu, 17 Dec 2015 15:01:58 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Dec 2015 03:11:07 GMT",
"version": "v2"
},
{
"created": "Sat, 27 Feb 2016 03:02:54 GMT",
"version": "v3"
},
{
"created": "Wed, 27 Jul 2016 15:09:20 GMT",
"version": "v4"
}
] |
2016-10-12
|
[
[
"Martinez",
"R.",
""
],
[
"Ochoa",
"F.",
""
],
[
"Sierra",
"C. F.",
""
]
] |
In the context of a nonuniversal and anomaly free $U(1)_{X}$ extension of the standard model, we examine the decay of a $750$GeV scalar singlet state, $\xi_{\chi}$, as a possible explanation of the observed diphoton excess announced by the ATLAS and CMS collaborations at CERN-LHC collider. One-loop decay to photons is allowed through three heavy singlet quarks and one charged Higgs boson into the loop. We obtain, for different width approximations and for masses of the exotic singlet quarks in the region $[900,\,3000]$ GeV, a production cross section $\sigma(pp\to\xi_{\chi}\to\gamma\gamma)$ compatible with ATLAS and CMS collaborations data. We also include another scalar singlet, $\sigma$, as a dark matter candidate that may couple with the 750 GeV scalar at tree level with production cross sections in agreement with ATLAS and CMS.
|
hep-ph/0309176
|
Aneesh Manohar
|
Aneesh V. Manohar
|
Deep inelastic scattering as x -> 1 using soft-collinear effective
theory
|
19 pages, minor typos fixed, and a comment added on the longitudinal
structure function
|
Phys.Rev. D68 (2003) 114019
|
10.1103/PhysRevD.68.114019
| null |
hep-ph
| null |
Soft-collinear effective theory (SCET) is used to sum Sudakov
double-logarithms in the x ->1 endpoint region for the deep inelastic
scattering structure function. The calculations are done in both the target
rest frame and the Breit frame. The separation of scales in the effective
theory implies that the anomalous dimension of the SCET current is linear in ln
mu, and the anomalous dimension for the Nth moment of the structure function is
linear in ln N, to all orders in perturbation theory. The SCET formulation is
shown to be free of Landau pole singularities. Some important differences
between the deep inelastic structure function and the shape function in B decay
are discussed.
|
[
{
"created": "Tue, 16 Sep 2003 19:27:52 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jan 2004 21:47:31 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Manohar",
"Aneesh V.",
""
]
] |
Soft-collinear effective theory (SCET) is used to sum Sudakov double-logarithms in the x ->1 endpoint region for the deep inelastic scattering structure function. The calculations are done in both the target rest frame and the Breit frame. The separation of scales in the effective theory implies that the anomalous dimension of the SCET current is linear in ln mu, and the anomalous dimension for the Nth moment of the structure function is linear in ln N, to all orders in perturbation theory. The SCET formulation is shown to be free of Landau pole singularities. Some important differences between the deep inelastic structure function and the shape function in B decay are discussed.
|
hep-ph/9604429
|
Chi-Sing Lam
|
Y.J. Feng, O. Hamidi-Ravari, and C. S. Lam
|
Cut Diagrams for High Energy Scatterings
|
uu-encoded file containing a latex manuscript with 14 postscript
figures
|
Phys.Rev.D54:3114-3124,1996
|
10.1103/PhysRevD.54.3114
|
McGill/96-13
|
hep-ph
| null |
A new approach is introduced to study QCD amplitudes at high energy and
comparatively small momentum transfer. Novel cut diagrams, representing
resummation of Feynman diagrams, are used to simplify calculation and to avoid
delicate cancellations encountered in the usual approach. Explicit calculation
to the 6th order is carried out to demonstrate the advantage of cut diagrams
over Feynman diagrams.
|
[
{
"created": "Mon, 29 Apr 1996 15:33:17 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Feng",
"Y. J.",
""
],
[
"Hamidi-Ravari",
"O.",
""
],
[
"Lam",
"C. S.",
""
]
] |
A new approach is introduced to study QCD amplitudes at high energy and comparatively small momentum transfer. Novel cut diagrams, representing resummation of Feynman diagrams, are used to simplify calculation and to avoid delicate cancellations encountered in the usual approach. Explicit calculation to the 6th order is carried out to demonstrate the advantage of cut diagrams over Feynman diagrams.
|
0712.4187
|
Chun-Khiang Chua
|
Chun-Khiang Chua
|
Rescattering effects in charmless B_{u,d,s} to P P decays
|
33 pages, 6 figures, version to appear in Phys. Rev. D
|
Phys.Rev.D78:076002,2008
|
10.1103/PhysRevD.78.076002
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the final-state interaction (FSI) effects in charmless B_{u,d,s} to
PP decays. We consider a FSI approach with both short- and long-distance
contributions, where the former are from in-elastic channels and are contained
in factorization amplitudes, while the latter are from the residual
rescattering among PP states. Flavor SU(3) symmetry is used to constrain the
residual rescattering S-matrix. We fit to all available data on the CP-averaged
decay rates and CP asymmetries, and make predictions on unmeasured ones. Our
main results are as follows: (i) Results are in agreement with data in the
presence of FSI. (ii) For B decays, the pi^+pi^- and pi^0pi^0 rates are
suppressed and enhanced respectively by FSI. (iii) The FSI has a large impact
on direct CP asymmetries of many modes. (iv) The deviation (Delta A) between
A(B{bar}^0 to K^-pi^+) and A(B^-to K^-\pi^0) can be understood in the FSI
approach. (v) Sizable and complex color-suppressed tree amplitudes, which are
crucial for the large \pi^0\pi^0 rate and Delta A, are generated through
exchange rescattering. The correlation of the ratio B(pi^0pi^0)/B(pi^+pi^-) and
Delta A is studied. (vi) The B^- to pi^-pi^0 direct CP violation is very small
and is not affected by FSI. (vii) Several B_s decay rates are enhanced. In
particular, the eta'eta' branching ratio is enhanced to the level of
1.0X10^{-4}, which can be checked experimentally. (viii) Time-dependent CP
asymmetries S in B_{d,s} decays are studied. CP asymmetries in these modes will
be useful to test the SM.
|
[
{
"created": "Thu, 27 Dec 2007 13:42:14 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Jan 2008 12:14:36 GMT",
"version": "v2"
},
{
"created": "Tue, 9 Sep 2008 07:32:20 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Chua",
"Chun-Khiang",
""
]
] |
We study the final-state interaction (FSI) effects in charmless B_{u,d,s} to PP decays. We consider a FSI approach with both short- and long-distance contributions, where the former are from in-elastic channels and are contained in factorization amplitudes, while the latter are from the residual rescattering among PP states. Flavor SU(3) symmetry is used to constrain the residual rescattering S-matrix. We fit to all available data on the CP-averaged decay rates and CP asymmetries, and make predictions on unmeasured ones. Our main results are as follows: (i) Results are in agreement with data in the presence of FSI. (ii) For B decays, the pi^+pi^- and pi^0pi^0 rates are suppressed and enhanced respectively by FSI. (iii) The FSI has a large impact on direct CP asymmetries of many modes. (iv) The deviation (Delta A) between A(B{bar}^0 to K^-pi^+) and A(B^-to K^-\pi^0) can be understood in the FSI approach. (v) Sizable and complex color-suppressed tree amplitudes, which are crucial for the large \pi^0\pi^0 rate and Delta A, are generated through exchange rescattering. The correlation of the ratio B(pi^0pi^0)/B(pi^+pi^-) and Delta A is studied. (vi) The B^- to pi^-pi^0 direct CP violation is very small and is not affected by FSI. (vii) Several B_s decay rates are enhanced. In particular, the eta'eta' branching ratio is enhanced to the level of 1.0X10^{-4}, which can be checked experimentally. (viii) Time-dependent CP asymmetries S in B_{d,s} decays are studied. CP asymmetries in these modes will be useful to test the SM.
|
1812.09258
|
Andrei Kataev
|
A.L. Kataev and V.S. Molokoedov
|
The least squares method: application to analysis of the flavor
dependence of the QCD relation between pole and $\rm{\overline{MS}}$-scheme
running heavy quark masses
|
9 pages, 1 Table
| null |
10.1134/S0040577919090101
|
INR-TH-2018-034
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The features of the ordinary least squares method, which gives a possible way
to a solution of the overdetermined systems of algebraic equations and allows
to estimate the uncertainties of the obtained solutions, are considered. As the
important physical example we define four-loop QCD coefficients in the
dependence of the relation between pole and running heavy quarks masses on the
number of light flavors, using the existing results of numerical supercomputer
based calculations of the corresponding four-loop contributions at different
fixed numbers of light flavors. Stability of the found solutions to the number
of the considered equations and unknowns is demonstrated and supported by the
Pearsons's $\chi$-squared test.
|
[
{
"created": "Thu, 20 Dec 2018 15:26:31 GMT",
"version": "v1"
}
] |
2019-10-23
|
[
[
"Kataev",
"A. L.",
""
],
[
"Molokoedov",
"V. S.",
""
]
] |
The features of the ordinary least squares method, which gives a possible way to a solution of the overdetermined systems of algebraic equations and allows to estimate the uncertainties of the obtained solutions, are considered. As the important physical example we define four-loop QCD coefficients in the dependence of the relation between pole and running heavy quarks masses on the number of light flavors, using the existing results of numerical supercomputer based calculations of the corresponding four-loop contributions at different fixed numbers of light flavors. Stability of the found solutions to the number of the considered equations and unknowns is demonstrated and supported by the Pearsons's $\chi$-squared test.
|
hep-ph/0010276
|
Josep Taron
|
A.A. Andrianov, R.Tarrach, J.Taron
|
Neutral Kaons in Medium: Decoherence Effects
| null |
Phys.Lett. B507 (2001) 200-206
|
10.1016/S0370-2693(01)00463-4
| null |
hep-ph quant-ph
| null |
We consider departures from hamiltonian dynamics in the evolution of neutral
kaons due to their interactions with environment that generate entanglement
among them. We propose a phenomenological model of stochastic re-scattering and
estimate the coefficients of the effective hamiltonian and decoherence terms.
Finally we analyze the interplay between the weak interaction and matter
effects and propose the observables suitable to measure the matter
characteristics of CPT violation and decoherence.
|
[
{
"created": "Tue, 24 Oct 2000 15:51:48 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Oct 2000 13:14:14 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Andrianov",
"A. A.",
""
],
[
"Tarrach",
"R.",
""
],
[
"Taron",
"J.",
""
]
] |
We consider departures from hamiltonian dynamics in the evolution of neutral kaons due to their interactions with environment that generate entanglement among them. We propose a phenomenological model of stochastic re-scattering and estimate the coefficients of the effective hamiltonian and decoherence terms. Finally we analyze the interplay between the weak interaction and matter effects and propose the observables suitable to measure the matter characteristics of CPT violation and decoherence.
|
2110.06824
|
Sergiy Akkelin
|
M.D. Adzhymambetov, S.V. Akkelin, Yu.M. Sinyukov
|
Fixed particle number constraint in a simple model of a thermal
expanding system and $pp$ collisions at the LHC
|
21 pages, 6 figures
|
Phys. Rev. D 105, 096035 (2022)
|
10.1103/PhysRevD.105.096035
| null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Two-boson momentum correlations at fixed particle number constraint are
studied in a simple analytically solvable model of a thermal expanding system.
We show that the increase of expansion rate, as well as increase of particle
multiplicity, enhances the ground-state contribution to particle momentum
spectra and leads to suppression of the Bose-Einstein momentum correlations.
The relations of these findings to the multiplicity-dependent measurements of
the Bose-Einstein momentum correlations in high-multiplicity $p+p$ collision
events at the LHC are discussed.
|
[
{
"created": "Wed, 13 Oct 2021 16:11:02 GMT",
"version": "v1"
},
{
"created": "Sat, 5 Feb 2022 14:56:57 GMT",
"version": "v2"
},
{
"created": "Mon, 30 May 2022 12:37:22 GMT",
"version": "v3"
}
] |
2022-05-31
|
[
[
"Adzhymambetov",
"M. D.",
""
],
[
"Akkelin",
"S. V.",
""
],
[
"Sinyukov",
"Yu. M.",
""
]
] |
Two-boson momentum correlations at fixed particle number constraint are studied in a simple analytically solvable model of a thermal expanding system. We show that the increase of expansion rate, as well as increase of particle multiplicity, enhances the ground-state contribution to particle momentum spectra and leads to suppression of the Bose-Einstein momentum correlations. The relations of these findings to the multiplicity-dependent measurements of the Bose-Einstein momentum correlations in high-multiplicity $p+p$ collision events at the LHC are discussed.
|
2112.07274
|
Jorge De Blas
|
J. de Blas, M. Ciuchini, E. Franco, A. Goncalves, S. Mishima, M.
Pierini, L. Reina and L. Silvestrini
|
Global analysis of electroweak data in the Standard Model
|
11 pages, 4 tables, 3 figures
| null |
10.1103/PhysRevD.106.033003
|
KEK-TH-2378
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a global fit of electroweak data within the Standard Model, using
state-of-the art experimental and theoretical results, including a
determination of the electromagnetic coupling at the electroweak scale based on
recent lattice calculations. In addition to the posteriors for all parameters
and observables obtained from the global fit, we present indirect
determinations for all parameters and predictions for all observables.
Furthermore, we present full predictions, obtained using only the experimental
information on Standard Model parameters, and a fully indirect determination of
Standard Model parameters using only experimental information on electroweak
data. Finally, we discuss in detail the compatibility of experimental data with
the Standard Model and find a global p-value of 0.5.
|
[
{
"created": "Tue, 14 Dec 2021 10:10:00 GMT",
"version": "v1"
}
] |
2022-08-17
|
[
[
"de Blas",
"J.",
""
],
[
"Ciuchini",
"M.",
""
],
[
"Franco",
"E.",
""
],
[
"Goncalves",
"A.",
""
],
[
"Mishima",
"S.",
""
],
[
"Pierini",
"M.",
""
],
[
"Reina",
"L.",
""
],
[
"Silvestrini",
"L.",
""
]
] |
We perform a global fit of electroweak data within the Standard Model, using state-of-the art experimental and theoretical results, including a determination of the electromagnetic coupling at the electroweak scale based on recent lattice calculations. In addition to the posteriors for all parameters and observables obtained from the global fit, we present indirect determinations for all parameters and predictions for all observables. Furthermore, we present full predictions, obtained using only the experimental information on Standard Model parameters, and a fully indirect determination of Standard Model parameters using only experimental information on electroweak data. Finally, we discuss in detail the compatibility of experimental data with the Standard Model and find a global p-value of 0.5.
|
hep-ph/9806280
|
Jos Vermaseren
|
J. A. M. Vermaseren
|
Harmonic sums, Mellin transforms and Integrals
|
31 pages LaTeX, for programs, see http://norma.nikhef.nl/~t68/summer
|
Int.J.Mod.Phys.A14:2037-2076,1999
|
10.1142/S0217751X99001032
|
FTUAM-98-7, NIKHEF-98-14
|
hep-ph
| null |
This paper describes algorithms to deal with nested symbolic sums over
combinations of harmonic series, binomial coefficients and denominators. In
addition it treats Mellin transforms and the inverse Mellin transformation for
functions that are encountered in Feynman diagram calculations. Together with
results for the values of the higher harmonic series at infinity the presented
algorithms can be used for the symbolic evaluation of whole classes of
integrals that were thus far intractable. Also many of the sums that had to be
evaluated seem to involve new results. Most of the algorithms have been
programmed in the language of FORM. The resulting set of procedures is called
SUMMER.
|
[
{
"created": "Fri, 5 Jun 1998 14:31:34 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Vermaseren",
"J. A. M.",
""
]
] |
This paper describes algorithms to deal with nested symbolic sums over combinations of harmonic series, binomial coefficients and denominators. In addition it treats Mellin transforms and the inverse Mellin transformation for functions that are encountered in Feynman diagram calculations. Together with results for the values of the higher harmonic series at infinity the presented algorithms can be used for the symbolic evaluation of whole classes of integrals that were thus far intractable. Also many of the sums that had to be evaluated seem to involve new results. Most of the algorithms have been programmed in the language of FORM. The resulting set of procedures is called SUMMER.
|
1805.00198
|
Yigal Shamir
|
Maarten Golterman and Yigal Shamir
|
The large-mass regime of the dilaton-pion low-energy effective theory
|
RevTeX, 16 pages. Major revision, more insight into the nature of the
expansion in the large-mass regime
|
Phys. Rev. D 98, 056025 (2018)
|
10.1103/PhysRevD.98.056025
| null |
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Numerical data of the SU(3) gauge theory with $N_f=8$ fermions in the
fundamental representation suggest the existence of a large-mass regime, where
the fermion mass is not small relative to the confinement scale, but
nevertheless the dilaton-pion low-energy theory is applicable thanks to the
parametric proximity of the conformal window. In this regime, the leading
hyperscaling relations are similar to those of a mass-deformed conformal
theory, so that distinguishing infrared conformality from confinement requires
the study of subleading effects. Assuming that the $N_f=8$ theory confines, we
estimate how light the fermion mass should be to enter the small-mass regime,
where the pions become much lighter than the dilatonic scalar meson.
|
[
{
"created": "Tue, 1 May 2018 06:18:55 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Aug 2018 07:17:28 GMT",
"version": "v2"
}
] |
2018-10-03
|
[
[
"Golterman",
"Maarten",
""
],
[
"Shamir",
"Yigal",
""
]
] |
Numerical data of the SU(3) gauge theory with $N_f=8$ fermions in the fundamental representation suggest the existence of a large-mass regime, where the fermion mass is not small relative to the confinement scale, but nevertheless the dilaton-pion low-energy theory is applicable thanks to the parametric proximity of the conformal window. In this regime, the leading hyperscaling relations are similar to those of a mass-deformed conformal theory, so that distinguishing infrared conformality from confinement requires the study of subleading effects. Assuming that the $N_f=8$ theory confines, we estimate how light the fermion mass should be to enter the small-mass regime, where the pions become much lighter than the dilatonic scalar meson.
|
0812.1299
|
Chung-I Tan
|
Richard C. Brower, Marko Djuric, and Chung-I Tan
|
Saturation and Confinement: Analyticity, Unitarity and AdS/CFT
Correspondence
|
more references added. presented at ISMD 2008, 15-20 Sept. 2008
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In $1/N_c$ expansion, analyticity and crossing lead to crossing even and odd
($C=\pm 1$) vacuum exchanges at high-energy, the {\em Pomeron} and the {\em
Odderon}. We discuss how, using {\em String/Gauge duality}, these can be
identified with a reggeized {\em Graviton} and the anti-symmetric {\em
Kalb-Ramond fields} in $AdS$ background. With confinement, these Regge
singularities interpolate with glueball states. We also discuss unitarization
based on eikonal sum in $AdS$.
|
[
{
"created": "Sat, 6 Dec 2008 22:22:12 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Dec 2008 20:16:56 GMT",
"version": "v2"
}
] |
2008-12-10
|
[
[
"Brower",
"Richard C.",
""
],
[
"Djuric",
"Marko",
""
],
[
"Tan",
"Chung-I",
""
]
] |
In $1/N_c$ expansion, analyticity and crossing lead to crossing even and odd ($C=\pm 1$) vacuum exchanges at high-energy, the {\em Pomeron} and the {\em Odderon}. We discuss how, using {\em String/Gauge duality}, these can be identified with a reggeized {\em Graviton} and the anti-symmetric {\em Kalb-Ramond fields} in $AdS$ background. With confinement, these Regge singularities interpolate with glueball states. We also discuss unitarization based on eikonal sum in $AdS$.
|
hep-ph/0512297
|
Mar\'ia Catalina Espinoza Hern\'andez
|
J. Bernabeu, J. Burguet-Castell, C. Espinoza and M. Lindroos
|
Physics Reach with a Monochromatic Neutrino Beam from Electron Capture
|
4 pages, 1 figure. Talk given at the International Europhysics
Conference on High Energy Physics, HEP-EPS 2005, Lisbon, Portugal, July
21-27, 2005
| null | null | null |
hep-ph
| null |
Neutrino oscillation experiments from different sources have demonstrated
non-vanishing neutrino masses and flavour mixings. The next experiments have to
address the determination of the connecting mixing U(e3) and the existence of
the CP violating phase. Whereas U(e3) measures the strength of the oscillation
probability in appearance experiments, the CP phase acts as a phase-shift in
the interference pattern. Here we propose to separate these two parameters by
energy dependence, using the novel idea of a monochromatic neutrino beam
facility based on the acceleration of ions that decay fast through electron
capture. Fine tuning of the boosted neutrino energy allows precision
measurements able to open a window for the discovery of CP violation, even for
a mixing as small as 1 degree.
|
[
{
"created": "Thu, 22 Dec 2005 12:59:22 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Bernabeu",
"J.",
""
],
[
"Burguet-Castell",
"J.",
""
],
[
"Espinoza",
"C.",
""
],
[
"Lindroos",
"M.",
""
]
] |
Neutrino oscillation experiments from different sources have demonstrated non-vanishing neutrino masses and flavour mixings. The next experiments have to address the determination of the connecting mixing U(e3) and the existence of the CP violating phase. Whereas U(e3) measures the strength of the oscillation probability in appearance experiments, the CP phase acts as a phase-shift in the interference pattern. Here we propose to separate these two parameters by energy dependence, using the novel idea of a monochromatic neutrino beam facility based on the acceleration of ions that decay fast through electron capture. Fine tuning of the boosted neutrino energy allows precision measurements able to open a window for the discovery of CP violation, even for a mixing as small as 1 degree.
|
2312.05776
|
Rie Inumiya
|
Gi-Chol Cho, Chikako Idegawa and Rie Inumiya
|
A complex singlet extension of the Standard Model with a singlet fermion
dark matter
|
16 pages, 4 figures
| null | null |
OCHA-PP-378
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We examine a complex singlet scalar extension of the Standard Model (CxSM)
with an extra singlet fermion. Both the singlet scalar and fermion are dark
matter (DM) candidates. It is known that although the scalar potential in the
CxSM can realize strong first-order electroweak phase transition, the scalar DM
included in the model gives only a tiny amount of the relic density compared to
the observed one. Therefore, a fermion DM is introduced to compensate for the
lack of relic density. We find that the scattering of the fermion DM and
nucleons is sufficiently suppressed when the masses of scalar mediators are
degenerate, as well as in the case of the scalar DM. We show the range of a
combination of the mass and the Yukawa coupling of the fermion DM, which
satisfies both the observed relic density and conditions of strong first-order
electroweak phase transition.
|
[
{
"created": "Sun, 10 Dec 2023 05:50:26 GMT",
"version": "v1"
}
] |
2023-12-12
|
[
[
"Cho",
"Gi-Chol",
""
],
[
"Idegawa",
"Chikako",
""
],
[
"Inumiya",
"Rie",
""
]
] |
We examine a complex singlet scalar extension of the Standard Model (CxSM) with an extra singlet fermion. Both the singlet scalar and fermion are dark matter (DM) candidates. It is known that although the scalar potential in the CxSM can realize strong first-order electroweak phase transition, the scalar DM included in the model gives only a tiny amount of the relic density compared to the observed one. Therefore, a fermion DM is introduced to compensate for the lack of relic density. We find that the scattering of the fermion DM and nucleons is sufficiently suppressed when the masses of scalar mediators are degenerate, as well as in the case of the scalar DM. We show the range of a combination of the mass and the Yukawa coupling of the fermion DM, which satisfies both the observed relic density and conditions of strong first-order electroweak phase transition.
|
hep-ph/9501318
| null |
Eugene Golowich and Joachim Kambor
|
Two-Loop Analysis of Vector Current Propagators in Chiral Perturbation
Theory
|
To appear in Nucl. Phys. B (Changes in Sects. 4,8)
|
Nucl.Phys. B447 (1995) 373-404
|
10.1016/0550-3213(95)00234-J
|
UMHEP-414
|
hep-ph
| null |
We perform a calculation of the isospin and hypercharge vector current
propagators ($\Delta_{V33}^{\mu\nu}(q^2)$ and $\Delta_{V88}^{\mu\nu}(q^2)$) to
two loops in chiral perturbation theory. The analysis is carried out with
straightforward Feynman diagram methods by making appropriate use of external
vector sources. Counterterms from the ${\cal O}(q^6)$ chiral lagrangian,
required to absorb divergences and scale dependence encountered at the two-loop
level, are constructed. Our final results are finite, covariant, and
scale-independent. Several applications are described, including a comparison
of the two-loop isospin vector spectral function with data and the construction
of new chiral sum rules.
|
[
{
"created": "Tue, 17 Jan 1995 14:15:04 GMT",
"version": "v1"
},
{
"created": "Mon, 22 May 1995 14:56:59 GMT",
"version": "v2"
},
{
"created": "Tue, 23 May 1995 21:04:18 GMT",
"version": "v3"
}
] |
2009-10-28
|
[
[
"Golowich",
"Eugene",
""
],
[
"Kambor",
"Joachim",
""
]
] |
We perform a calculation of the isospin and hypercharge vector current propagators ($\Delta_{V33}^{\mu\nu}(q^2)$ and $\Delta_{V88}^{\mu\nu}(q^2)$) to two loops in chiral perturbation theory. The analysis is carried out with straightforward Feynman diagram methods by making appropriate use of external vector sources. Counterterms from the ${\cal O}(q^6)$ chiral lagrangian, required to absorb divergences and scale dependence encountered at the two-loop level, are constructed. Our final results are finite, covariant, and scale-independent. Several applications are described, including a comparison of the two-loop isospin vector spectral function with data and the construction of new chiral sum rules.
|
2003.00640
|
Avik Roy
|
Avik Roy, Nikiforos Nikiforou, Nuno Castro, Timothy Andeen
|
Novel Interpretation Strategy for Searches of Singly Produced
Vector-like Quarks at the LHC
|
22 pages, 8 figures, 4 tables
|
Phys. Rev. D 101, 115027 (2020)
|
10.1103/PhysRevD.101.115027
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Vector-like Quarks (VLQs) are potential signatures of physics beyond the
Standard Model at the TeV energy scale and major efforts have been put forward
at both ATLAS and CMS experiments in search of these particles. In order to
make these search results more relatable in the context of most plausible
theories of VLQs, it is deemed important to present the analysis results in a
general fashion. We investigate the challenges associated with such
interpretations of singly produced VLQ searches and propose a generalized,
semi-analytical framework that allows a model-independent casting of the
results in terms of unconstrained, free parameters of the VLQ Lagrangian. We
also propose a simple parameterization of the correction factor to the single
VLQ production cross-section at large decay widths. We illustrate how the
proposed framework can be used to conveniently represent statistical limits by
numerically reinterpreting results from benchmark ATLAS and CMS analyses.
|
[
{
"created": "Mon, 2 Mar 2020 03:19:42 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jun 2020 18:02:07 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Jun 2020 15:23:00 GMT",
"version": "v3"
}
] |
2020-07-01
|
[
[
"Roy",
"Avik",
""
],
[
"Nikiforou",
"Nikiforos",
""
],
[
"Castro",
"Nuno",
""
],
[
"Andeen",
"Timothy",
""
]
] |
Vector-like Quarks (VLQs) are potential signatures of physics beyond the Standard Model at the TeV energy scale and major efforts have been put forward at both ATLAS and CMS experiments in search of these particles. In order to make these search results more relatable in the context of most plausible theories of VLQs, it is deemed important to present the analysis results in a general fashion. We investigate the challenges associated with such interpretations of singly produced VLQ searches and propose a generalized, semi-analytical framework that allows a model-independent casting of the results in terms of unconstrained, free parameters of the VLQ Lagrangian. We also propose a simple parameterization of the correction factor to the single VLQ production cross-section at large decay widths. We illustrate how the proposed framework can be used to conveniently represent statistical limits by numerically reinterpreting results from benchmark ATLAS and CMS analyses.
|
hep-ph/0201047
|
Nelly Goguitidze
|
N. Gogitidze (on behalf of the H1 and ZEUS collaborations)
|
Determination of the longitudinal structure function $F_{L}$ at HERA
|
16 pages, 11 figures (requires iopart, iopams and epsfig); Talk
presented in the Intern. Workshop on New Trends in HERA Physics 2001, 17-22
June 2001, Ringberg Castle, Tegernsee, Germany; To appear in the Proceedings
|
J.Phys.G28:751-766,2002
|
10.1088/0954-3899/28/5/303
| null |
hep-ph
| null |
Recent results from the HERA experiment H1 on the longitudinal stucture
function $F_{L}$ of the proton are presented. They include proton structure
function analyses with particular emphasis on those kinematic regions which are
sensitive to $F_{L}$. All results can be consistently described within the
framework of perturbative QCD.
|
[
{
"created": "Tue, 8 Jan 2002 12:37:11 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Gogitidze",
"N.",
"",
"on behalf of the H1 and ZEUS collaborations"
]
] |
Recent results from the HERA experiment H1 on the longitudinal stucture function $F_{L}$ of the proton are presented. They include proton structure function analyses with particular emphasis on those kinematic regions which are sensitive to $F_{L}$. All results can be consistently described within the framework of perturbative QCD.
|
hep-ph/0003035
|
Michael Kraemer
|
Michael Kr\"amer, Fredrick I. Olness, Davison E. Soper
|
Treatment of Heavy Quarks in Deeply Inelastic Scattering
|
14 pages, 5 figures
|
Phys.Rev.D62:096007,2000
|
10.1103/PhysRevD.62.096007
|
Edinburgh 2000/02
|
hep-ph
| null |
We investigate a simplified version of the ACOT prescription for calculating
deeply inelastic scattering from Q^2 values near the squared mass M_H^2 of a
heavy quark to Q^2 much larger than M_H^2.
|
[
{
"created": "Sun, 5 Mar 2000 13:59:24 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Krämer",
"Michael",
""
],
[
"Olness",
"Fredrick I.",
""
],
[
"Soper",
"Davison E.",
""
]
] |
We investigate a simplified version of the ACOT prescription for calculating deeply inelastic scattering from Q^2 values near the squared mass M_H^2 of a heavy quark to Q^2 much larger than M_H^2.
|
hep-ph/0103052
|
Steve Geer
|
V. Barger, et al
|
Oscillation Measurements with Upgraded Conventional Neutrino Beams
|
42 pages, 20 figures
| null | null |
FERMILAB-FN-703
|
hep-ph
| null |
We consider the nu_mu to nu_e oscillation measurements that would be possible
at upgraded 1 GeV and multi-GeV conventional neutrino sources driven by future
megawatt-scale proton drivers. If these neutrino superbeams are used together
with detectors that are an order of magnitude larger than those presently
foreseen, we find that the sensitivity to nu_mu to nu_e oscillations can be
improved by an order of magnitude beyond the next generation of accelerator
based experiments. In addition, over a limited region of parameter space, the
neutrino mass hierarchy can be determined with a multi-GeV long baseline beam.
If the Large Mixing Angle MSW solution correctly describes the solar neutrino
deficit, there is a small corner of allowed parameter space in which maximal
CP-violation in the lepton sector might be observable at a 1 GeV medium
baseline experiment. Superbeams with massive detectors would therefore provide
a useful tool en route to a neutrino factory, which would permit a further
order of magnitude improvement in sensitivity, together with a more
comprehensive check of CP-violation and the oscillation framework.
|
[
{
"created": "Mon, 5 Mar 2001 22:57:45 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Mar 2001 18:51:55 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Barger",
"V.",
""
]
] |
We consider the nu_mu to nu_e oscillation measurements that would be possible at upgraded 1 GeV and multi-GeV conventional neutrino sources driven by future megawatt-scale proton drivers. If these neutrino superbeams are used together with detectors that are an order of magnitude larger than those presently foreseen, we find that the sensitivity to nu_mu to nu_e oscillations can be improved by an order of magnitude beyond the next generation of accelerator based experiments. In addition, over a limited region of parameter space, the neutrino mass hierarchy can be determined with a multi-GeV long baseline beam. If the Large Mixing Angle MSW solution correctly describes the solar neutrino deficit, there is a small corner of allowed parameter space in which maximal CP-violation in the lepton sector might be observable at a 1 GeV medium baseline experiment. Superbeams with massive detectors would therefore provide a useful tool en route to a neutrino factory, which would permit a further order of magnitude improvement in sensitivity, together with a more comprehensive check of CP-violation and the oscillation framework.
|
hep-ph/9509428
| null |
Amol S. Dighe, Michael Gronau and Jonathan L. Rosner
|
Amplitude relations for $B$ decays involving $\eta$ and $\eta'$
|
7 pages, latex, 1 uuencoded figure
|
Phys.Lett.B367:357-361,1996; ERRATUM-ibid.B377:325,1996
|
10.1016/0370-2693(95)01341-5
|
TECHNION-PH-95-27, EFI-95-60
|
hep-ph
| null |
A class of amplitude relations for decays of $B$ mesons is discussed.
Processes involving $\eta$ and $\eta'$ in the final state are shown to provide
useful information about weak phases in some cases even in the presence of
octet-singlet mixing in these states. Some of the relations are unaffected by
first-order SU(3) breaking.
|
[
{
"created": "Fri, 29 Sep 1995 20:24:39 GMT",
"version": "v1"
}
] |
2011-07-19
|
[
[
"Dighe",
"Amol S.",
""
],
[
"Gronau",
"Michael",
""
],
[
"Rosner",
"Jonathan L.",
""
]
] |
A class of amplitude relations for decays of $B$ mesons is discussed. Processes involving $\eta$ and $\eta'$ in the final state are shown to provide useful information about weak phases in some cases even in the presence of octet-singlet mixing in these states. Some of the relations are unaffected by first-order SU(3) breaking.
|
2107.07074
|
Naoki Yamamoto
|
Akihiro Yamada, Naoki Yamamoto
|
Floquet vacuum engineering: Laser-driven chiral soliton lattice in the
QCD vacuum
|
7 pages; v2: added discussion of Weyl/Dirac semimetals, typos fixed,
published version
|
Phys. Rev. D 104, 054041 (2021)
|
10.1103/PhysRevD.104.054041
| null |
hep-ph cond-mat.str-el hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
What happens to the QCD vacuum when a time-periodic circularly polarized
laser field with a sufficiently large intensity and frequency is applied? Based
on the Floquet formalism for periodically driven systems and the systematic
low-energy effective theory of QCD, we show that for a sufficiently large
frequency and above a critical intensity, the QCD vacuum is unstable against
the chiral soliton lattice of pions; a crystalline structure of topological
solitons that spontaneously breaks parity and continuous translational
symmetries. Our work would pave the way for novel "Floquet vacuum engineering."
|
[
{
"created": "Thu, 15 Jul 2021 02:11:03 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Sep 2021 13:28:05 GMT",
"version": "v2"
}
] |
2021-10-01
|
[
[
"Yamada",
"Akihiro",
""
],
[
"Yamamoto",
"Naoki",
""
]
] |
What happens to the QCD vacuum when a time-periodic circularly polarized laser field with a sufficiently large intensity and frequency is applied? Based on the Floquet formalism for periodically driven systems and the systematic low-energy effective theory of QCD, we show that for a sufficiently large frequency and above a critical intensity, the QCD vacuum is unstable against the chiral soliton lattice of pions; a crystalline structure of topological solitons that spontaneously breaks parity and continuous translational symmetries. Our work would pave the way for novel "Floquet vacuum engineering."
|
2107.09671
|
Dario Bettoni
|
Dario Bettoni, Asier Lopez-Eiguren, Javier Rubio
|
Hubble-induced phase transitions on the lattice with applications to
Ricci reheating
|
26 pages, 12 figures, 1 appendix. Minor revisions, updated
references, matches published version. Computer generated movies of the
simulation are available at
https://youtube.com/playlist?list=PLl1K9-81ct6yHh6boyTiZAfNv_zlwux7-
| null |
10.1088/1475-7516/2022/01/002
| null |
hep-ph astro-ph.CO gr-qc hep-lat
|
http://creativecommons.org/licenses/by/4.0/
|
Using 3+1 classical lattice simulations, we follow the symmetry breaking
pattern and subsequent non-linear evolution of a spectator field non-minimally
coupled to gravity when the post-inflationary dynamics is given in terms of a
stiff equation-of-state parameter. We find that the gradient energy density
immediately after the transition represents a non-negligible fraction of the
total energy budget, steadily growing to equal the kinetic counterpart. This
behaviour is reflected on the evolution of the associated equation-of-state
parameter, which approaches a universal value $1/3$, independently of the shape
of non-linear interactions. Combined with kination, this observation allows for
the generic onset of radiation domination for arbitrary self-interacting
potentials, significantly extending previous results in the literature. The
produced spectrum at that time is, however, non-thermal, precluding the naive
extraction of thermodynamical quantities like temperature. Potential
identifications of the spectator field with the Standard Model Higgs are also
discussed.
|
[
{
"created": "Tue, 20 Jul 2021 16:39:55 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jan 2022 09:43:56 GMT",
"version": "v2"
}
] |
2022-01-11
|
[
[
"Bettoni",
"Dario",
""
],
[
"Lopez-Eiguren",
"Asier",
""
],
[
"Rubio",
"Javier",
""
]
] |
Using 3+1 classical lattice simulations, we follow the symmetry breaking pattern and subsequent non-linear evolution of a spectator field non-minimally coupled to gravity when the post-inflationary dynamics is given in terms of a stiff equation-of-state parameter. We find that the gradient energy density immediately after the transition represents a non-negligible fraction of the total energy budget, steadily growing to equal the kinetic counterpart. This behaviour is reflected on the evolution of the associated equation-of-state parameter, which approaches a universal value $1/3$, independently of the shape of non-linear interactions. Combined with kination, this observation allows for the generic onset of radiation domination for arbitrary self-interacting potentials, significantly extending previous results in the literature. The produced spectrum at that time is, however, non-thermal, precluding the naive extraction of thermodynamical quantities like temperature. Potential identifications of the spectator field with the Standard Model Higgs are also discussed.
|
2006.08758
|
Kamel Khelifa-Kerfa
|
Kamel Khelifa-Kerfa, Yazid Delenda
|
Eikonal amplitudes for three-hard legs processes at finite-N$_c$
|
6 pages. Published version
|
Physics Letters B 809 (2020) 135768
|
10.1016/j.physletb.2020.135768
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We extend our previous work on scattering amplitudes [1] to hadron
collisions. We provide a general formalism for the computation of eikonal
amplitudes squared for the radiation of soft and energy-ordered gluons off
three hard-legs at finite-N$_c$ to any order in the perturbative expansion.
Examples of three-hard legs processes include vector/Higgs boson production in
association with a single hard jet and dijet production in DIS. Explicit
expressions for the radiation of up to four gluons are provided as an
illustration of the formalism.
|
[
{
"created": "Mon, 15 Jun 2020 20:50:32 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Sep 2020 11:23:15 GMT",
"version": "v2"
}
] |
2020-09-15
|
[
[
"Khelifa-Kerfa",
"Kamel",
""
],
[
"Delenda",
"Yazid",
""
]
] |
We extend our previous work on scattering amplitudes [1] to hadron collisions. We provide a general formalism for the computation of eikonal amplitudes squared for the radiation of soft and energy-ordered gluons off three hard-legs at finite-N$_c$ to any order in the perturbative expansion. Examples of three-hard legs processes include vector/Higgs boson production in association with a single hard jet and dijet production in DIS. Explicit expressions for the radiation of up to four gluons are provided as an illustration of the formalism.
|
1407.6010
|
Mark Hertzberg
|
Mark P. Hertzberg, Frank Wilczek
|
Inflation Driven by Unification Energy
|
5 double column pages, 1 figure. V2: Updated to resemble version
published in PRD
|
Phys. Rev. D 95, 063516 (2017)
|
10.1103/PhysRevD.95.063516
|
MIT-CTP 4551
|
hep-ph astro-ph.CO gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We examine the hypothesis that inflation is primarily driven by vacuum energy
at a scale indicated by gauge coupling unification. Concretely, we consider a
class of hybrid inflation models wherein the vacuum energy associated with a
grand unified theory condensate provides the dominant energy during inflation,
while a second "inflaton" scalar slow-rolls. We show that it is possible to
obtain significant tensor-to-scalar ratios while fitting the observed spectral
index.
|
[
{
"created": "Tue, 22 Jul 2014 20:00:26 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Mar 2017 03:25:56 GMT",
"version": "v2"
}
] |
2017-03-28
|
[
[
"Hertzberg",
"Mark P.",
""
],
[
"Wilczek",
"Frank",
""
]
] |
We examine the hypothesis that inflation is primarily driven by vacuum energy at a scale indicated by gauge coupling unification. Concretely, we consider a class of hybrid inflation models wherein the vacuum energy associated with a grand unified theory condensate provides the dominant energy during inflation, while a second "inflaton" scalar slow-rolls. We show that it is possible to obtain significant tensor-to-scalar ratios while fitting the observed spectral index.
|
hep-ph/0008236
|
Adam K. Leibovich
|
Adam K Leibovich
|
Quarkonium production and NRQCD matrix elements
|
6 pages, 1 figure, talk given at 4th International Conference on
Hyperons, Charm and Beauty Hadrons, Valencia, Spain, 27-30 Jun 2000
|
Nucl.Phys.Proc.Suppl. 93 (2001) 182-187
|
10.1016/S0920-5632(00)01099-9
| null |
hep-ph
| null |
Most recent calculations of quarkonium production are based on the NRQCD
factorization formalism. This formalism is reviewed. To make predictions about
specific cross section, universal NRQCD matrix elements need to be extracted
from experiments. Extractions from different experimental situations are
compared, with some emphasis on the extraction from LEP.
|
[
{
"created": "Tue, 22 Aug 2000 18:11:43 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Leibovich",
"Adam K",
""
]
] |
Most recent calculations of quarkonium production are based on the NRQCD factorization formalism. This formalism is reviewed. To make predictions about specific cross section, universal NRQCD matrix elements need to be extracted from experiments. Extractions from different experimental situations are compared, with some emphasis on the extraction from LEP.
|
1310.7471
|
Jianhui Zhang
|
Xiaonu Xiong, Xiangdong Ji, Jian-Hui Zhang, Yong Zhao
|
One-Loop Matching for Parton Distributions: Non-Singlet Case
|
10 pages, 1 figure
|
Phys. Rev. D 90, 014051 (2014)
|
10.1103/PhysRevD.90.014051
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive one-loop matching condition for non-singlet quark distributions in
transverse-momentum cut-off scheme, including unpolarized, helicity and
transversity distributions. The matching is between the quasi-distribution
defined by static correlation at finite nucleon momentum and the light-cone
distribution measurable in experiments. The result is useful for extracting the
latter from the former in a lattice QCD calculation.
|
[
{
"created": "Mon, 28 Oct 2013 15:59:23 GMT",
"version": "v1"
}
] |
2014-08-13
|
[
[
"Xiong",
"Xiaonu",
""
],
[
"Ji",
"Xiangdong",
""
],
[
"Zhang",
"Jian-Hui",
""
],
[
"Zhao",
"Yong",
""
]
] |
We derive one-loop matching condition for non-singlet quark distributions in transverse-momentum cut-off scheme, including unpolarized, helicity and transversity distributions. The matching is between the quasi-distribution defined by static correlation at finite nucleon momentum and the light-cone distribution measurable in experiments. The result is useful for extracting the latter from the former in a lattice QCD calculation.
|
0905.2596
|
Alexey Gulov
|
A.V.Gulov and V.V.Skalozub
|
Model independent search for Z'-boson signals
|
60 pages, 14 figures. Minor corrections in the text
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An approach to the model-independent searching for the Z' gauge boson as a
virtual state in scattering processes is developed. It accounts for as a basic
requirement the renormalizability of underlying unspecified in other respects
model. This results in a set of relations between low energy couplings of Z' to
fermions that reduces in an essential way the number of parameters to be fitted
in experiments. On this ground the observables which uniquely pick out the Z'
boson in leptonic processes are introduced and the data of LEP experiments
analyzed. The Z' couplings to leptons and quarks are estimated at 95%
confidence level. These estimates may serve as a guide for experiments at the
Tevatron and/or LHC. A comparison with other approaches and results is given.
|
[
{
"created": "Fri, 15 May 2009 18:21:41 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Jun 2009 06:08:29 GMT",
"version": "v2"
}
] |
2009-06-22
|
[
[
"Gulov",
"A. V.",
""
],
[
"Skalozub",
"V. V.",
""
]
] |
An approach to the model-independent searching for the Z' gauge boson as a virtual state in scattering processes is developed. It accounts for as a basic requirement the renormalizability of underlying unspecified in other respects model. This results in a set of relations between low energy couplings of Z' to fermions that reduces in an essential way the number of parameters to be fitted in experiments. On this ground the observables which uniquely pick out the Z' boson in leptonic processes are introduced and the data of LEP experiments analyzed. The Z' couplings to leptons and quarks are estimated at 95% confidence level. These estimates may serve as a guide for experiments at the Tevatron and/or LHC. A comparison with other approaches and results is given.
|
hep-ph/0409074
|
Maurizio Piai
|
Maurizio Piai
|
Composite Vector Mesons and the Little Higgs Mechanism
|
4 pages, 2 figures, Talk given at the 12th International Conference
on Supersymmetry and Unification of Fundamental Interactions, June 17-23,
2004, Tsukuba, Japan
| null | null | null |
hep-ph
| null |
I review a technique to embed vector mesons in the chiral Lagrangian of QCD,
and apply it to more general coset spaces, relevant for Little Higgs models.
The implementation of heavy spin-1 fields in Little Higgs models allows for a
better control over previously non calculable, ultra-violate sensitive
quantities, such as the Higgs couplings. A relevant application is the study of
vacuum alignment in the SU(6)/Sp(6) models.
|
[
{
"created": "Tue, 7 Sep 2004 14:44:00 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Piai",
"Maurizio",
""
]
] |
I review a technique to embed vector mesons in the chiral Lagrangian of QCD, and apply it to more general coset spaces, relevant for Little Higgs models. The implementation of heavy spin-1 fields in Little Higgs models allows for a better control over previously non calculable, ultra-violate sensitive quantities, such as the Higgs couplings. A relevant application is the study of vacuum alignment in the SU(6)/Sp(6) models.
|
1910.09640
|
Umberto D'Alesio
|
Umberto D'Alesio, Francesco Murgia, Cristian Pisano, and Sangem Rajesh
|
Single-spin asymmetries in $p^\uparrow p \to J/\psi +X$ within a TMD
approach: role of the color octet mechanism
|
10 pages, 6 figures (12 plots)
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the transverse single-spin asymmetry (SSA) for $J/\psi$
production in proton-proton collisions, within non-relativistic QCD, employing
the transverse momentum dependent, generalized parton model, which includes
both spin and intrinsic motion effects. In particular, we study the role of the
color octet mechanism in accessing the gluon Sivers function. In doing that, we
also show, within this approach, how the singularities coming from color octet
terms in the low-$P_T$ region can be handled, leading to finite cross sections.
Predictions for both unpolarized cross sections and SSAs are given and compared
against PHENIX data. Estimates for LHCb in the fixed target mode are also
presented.
|
[
{
"created": "Mon, 21 Oct 2019 20:38:20 GMT",
"version": "v1"
}
] |
2019-10-23
|
[
[
"D'Alesio",
"Umberto",
""
],
[
"Murgia",
"Francesco",
""
],
[
"Pisano",
"Cristian",
""
],
[
"Rajesh",
"Sangem",
""
]
] |
We calculate the transverse single-spin asymmetry (SSA) for $J/\psi$ production in proton-proton collisions, within non-relativistic QCD, employing the transverse momentum dependent, generalized parton model, which includes both spin and intrinsic motion effects. In particular, we study the role of the color octet mechanism in accessing the gluon Sivers function. In doing that, we also show, within this approach, how the singularities coming from color octet terms in the low-$P_T$ region can be handled, leading to finite cross sections. Predictions for both unpolarized cross sections and SSAs are given and compared against PHENIX data. Estimates for LHCb in the fixed target mode are also presented.
|
1405.0938
|
Marlene Nahrgang
|
Marlene Nahrgang, J\"org Aichelin, Pol Bernard Gossiaux, Klaus Werner
|
D mesons in non-central heavy-ion collisions: fluctuating vs. averaged
initial conditions
|
Contribution to the Hard Probes 2013 Conference
| null |
10.1016/j.nuclphysa.2014.07.017
| null |
hep-ph nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The suppression of D mesons in non-central heavy-ion collisions is
investigated. The anisotropy in collisions at finite impact parameter leads to
an ordering of all-angle, in- and out-of-plane nuclear modification factors due
to the different in-medium path lengths. Within our MC@sHQ+EPOS model of
heavy-quark propagation in the QGP we demonstrate that fluctuating initial
conditions lead to an effective reduction of the energy loss of heavy quarks,
which is seen in a larger nuclear modification factor at intermediate and high
transverse momenta. The elliptic flow at small transverse momenta is reduced.
|
[
{
"created": "Mon, 5 May 2014 15:55:04 GMT",
"version": "v1"
}
] |
2015-10-28
|
[
[
"Nahrgang",
"Marlene",
""
],
[
"Aichelin",
"Jörg",
""
],
[
"Gossiaux",
"Pol Bernard",
""
],
[
"Werner",
"Klaus",
""
]
] |
The suppression of D mesons in non-central heavy-ion collisions is investigated. The anisotropy in collisions at finite impact parameter leads to an ordering of all-angle, in- and out-of-plane nuclear modification factors due to the different in-medium path lengths. Within our MC@sHQ+EPOS model of heavy-quark propagation in the QGP we demonstrate that fluctuating initial conditions lead to an effective reduction of the energy loss of heavy quarks, which is seen in a larger nuclear modification factor at intermediate and high transverse momenta. The elliptic flow at small transverse momenta is reduced.
|
0909.2498
|
Wojciech Krolikowski
|
Wojciech Krolikowski (University of Warsaw)
|
Is the electromagnetic field a source of a mediating field in hidden
sector?
|
1+9 pages, two unpleasant misprints are corrected
| null | null |
IFT-09/9
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We continue the discussion of a proposed model of hidden sector of the
Universe, consisting of sterile spin-1/2 Dirac fermions ("sterinos"), sterile
spin-0 bosons ("sterons") with spontaneously nonzero vacuum expectation value,
and sterile nongauge mediating bosons ("A bosons") described by an
antisymmetric-tensor field (of dimension one). The Standard-Model
electromagnetic field (of dimension two) multiplied by the steron vacuum
expectation value becomes in a spontaneous way a source of A-boson field
mediating new weak interactions in hidden sector and providing - due to the
action of electromagnetic field in both sectors - a weak coupling between
hidden and Standard-Model sectors ("photonic portal"). The proposed photonic
portal emphasizes even more the role of electromagnetic field in the structure
of the Universe.
|
[
{
"created": "Mon, 14 Sep 2009 09:42:25 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Dec 2009 10:15:01 GMT",
"version": "v2"
}
] |
2009-12-09
|
[
[
"Krolikowski",
"Wojciech",
"",
"University of Warsaw"
]
] |
We continue the discussion of a proposed model of hidden sector of the Universe, consisting of sterile spin-1/2 Dirac fermions ("sterinos"), sterile spin-0 bosons ("sterons") with spontaneously nonzero vacuum expectation value, and sterile nongauge mediating bosons ("A bosons") described by an antisymmetric-tensor field (of dimension one). The Standard-Model electromagnetic field (of dimension two) multiplied by the steron vacuum expectation value becomes in a spontaneous way a source of A-boson field mediating new weak interactions in hidden sector and providing - due to the action of electromagnetic field in both sectors - a weak coupling between hidden and Standard-Model sectors ("photonic portal"). The proposed photonic portal emphasizes even more the role of electromagnetic field in the structure of the Universe.
|
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