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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1409.6322
|
Travis A.W. Martin
|
Travis A.W. Martin and David Morrissey
|
Electroweakino constraints from LHC data
|
30 pages, 15 figures
| null |
10.1007/JHEP12(2014)168
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the sensitivity of existing LHC searches to the charginos and
neutralinos of the MSSM when all the other superpartners are decoupled. In this
limit, the underlying parameter space reduces to a simple four-dimensional set
$\{M_1,\,M_2,\,\mu,\,\tan\beta\}$. We examine the constraints placed on this
parameter space by a broad range of LHC searches taking into account the full
set of relevant production and decay channels. We find that the exclusions
implied by these searches exceed existing limits from LEP only for smaller
values of the Bino mass $M_1 \lesssim 150$ GeV. Our results have implications
for MSSM dark matter and electroweak baryogenesis.
|
[
{
"created": "Mon, 22 Sep 2014 20:00:45 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Oct 2014 18:55:27 GMT",
"version": "v2"
},
{
"created": "Tue, 7 Oct 2014 15:30:51 GMT",
"version": "v3"
},
{
"created": "Fri, 5 Dec 2014 19:53:47 GMT",
"version": "v4"
}
] |
2015-06-22
|
[
[
"Martin",
"Travis A. W.",
""
],
[
"Morrissey",
"David",
""
]
] |
We investigate the sensitivity of existing LHC searches to the charginos and neutralinos of the MSSM when all the other superpartners are decoupled. In this limit, the underlying parameter space reduces to a simple four-dimensional set $\{M_1,\,M_2,\,\mu,\,\tan\beta\}$. We examine the constraints placed on this parameter space by a broad range of LHC searches taking into account the full set of relevant production and decay channels. We find that the exclusions implied by these searches exceed existing limits from LEP only for smaller values of the Bino mass $M_1 \lesssim 150$ GeV. Our results have implications for MSSM dark matter and electroweak baryogenesis.
|
hep-ph/0203056
|
Michael Spira
|
D. Cavalli, A. Djouadi, K. Jakobs, A. Nikitenko, M. Spira, C.E.M.
Wagner, W.-M. Yao, K.A. Assamagan, G. Azuelos, S. Balatenychev, G.
B\'elanger, M. Bisset, A. Bocci, F. Boudjema, C. Buttar, M. Carena, S.
Catani, V. Cavasinni, Y. Coadou, D. Costanzo, A. Cottrant, A.K. Datta, A.
Deandrea, D. de Florian, V. Del Duca, B. Di Girolamo, V. Drollinger, T. Figy,
M. Frank, R.M. Godbole, M. Grazzini, M. Guchait, R. Harper, S. Heinemeyer, J.
Hobbs, W. Hollik, C. Hugonie, V.I. Ilyin, W.B. Kilgore, R. Kinnunen, M.
Klute, R. Lafaye, Y. Mambrini, R. Mazini, K. Mazumdar, F. Moortgat, S.
Moretti, G. Negri, L. Neukermans, C. Oleari, A. Pukhov, D. Rainwater, E.
Richter-Was, D.P. Roy, C.R. Schmidt, A. Semenov, J. Thomas, I. Vivarelli, G.
Weiglein, D. Zeppenfeld
|
The Higgs Working Group: Summary Report (2001)
|
120 pages, latex, many figures, proceedings of the Workshop `Physics
at TeV Colliders', Les Houches, France, 21 May - 1 June 2001, full Author
list included in paper. Typos corrected, author list and acknowledgements
completed. Convernors: D. Cavalli, A. Djouadi, K. Jakobs, A. Nikitenko, M.
Spira, C.E.M. Wagner, W.-M. Yao
| null | null | null |
hep-ph
| null |
Report of the Higgs working group for the Workshop `Physics at TeV
Colliders', Les Houches, France, 21 May - 1 June 2001. It contains 7 separate
sections: A. Theoretical Developments B. Higgs Searches at the Tevatron C.
Experimental Observation of an invisible Higgs Boson at LHC D. Search for the
Standard Model Higgs Boson using Vector Boson Fusion at the LHC E. Study of the
MSSM channel $A/H \to \tau \tau$ at the LHC F. Searching for Higgs Bosons in
$t\bar t H$ Production G. Studies of Charged Higgs Boson Signals for the
Tevatron and the LHC
|
[
{
"created": "Tue, 5 Mar 2002 21:59:31 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Mar 2002 16:56:54 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Cavalli",
"D.",
""
],
[
"Djouadi",
"A.",
""
],
[
"Jakobs",
"K.",
""
],
[
"Nikitenko",
"A.",
""
],
[
"Spira",
"M.",
""
],
[
"Wagner",
"C. E. M.",
""
],
[
"Yao",
"W. -M.",
""
],
[
"Assamagan",
"K. A.",
""
],
[
"Azuelos",
"G.",
""
],
[
"Balatenychev",
"S.",
""
],
[
"Bélanger",
"G.",
""
],
[
"Bisset",
"M.",
""
],
[
"Bocci",
"A.",
""
],
[
"Boudjema",
"F.",
""
],
[
"Buttar",
"C.",
""
],
[
"Carena",
"M.",
""
],
[
"Catani",
"S.",
""
],
[
"Cavasinni",
"V.",
""
],
[
"Coadou",
"Y.",
""
],
[
"Costanzo",
"D.",
""
],
[
"Cottrant",
"A.",
""
],
[
"Datta",
"A. K.",
""
],
[
"Deandrea",
"A.",
""
],
[
"de Florian",
"D.",
""
],
[
"Del Duca",
"V.",
""
],
[
"Di Girolamo",
"B.",
""
],
[
"Drollinger",
"V.",
""
],
[
"Figy",
"T.",
""
],
[
"Frank",
"M.",
""
],
[
"Godbole",
"R. M.",
""
],
[
"Grazzini",
"M.",
""
],
[
"Guchait",
"M.",
""
],
[
"Harper",
"R.",
""
],
[
"Heinemeyer",
"S.",
""
],
[
"Hobbs",
"J.",
""
],
[
"Hollik",
"W.",
""
],
[
"Hugonie",
"C.",
""
],
[
"Ilyin",
"V. I.",
""
],
[
"Kilgore",
"W. B.",
""
],
[
"Kinnunen",
"R.",
""
],
[
"Klute",
"M.",
""
],
[
"Lafaye",
"R.",
""
],
[
"Mambrini",
"Y.",
""
],
[
"Mazini",
"R.",
""
],
[
"Mazumdar",
"K.",
""
],
[
"Moortgat",
"F.",
""
],
[
"Moretti",
"S.",
""
],
[
"Negri",
"G.",
""
],
[
"Neukermans",
"L.",
""
],
[
"Oleari",
"C.",
""
],
[
"Pukhov",
"A.",
""
],
[
"Rainwater",
"D.",
""
],
[
"Richter-Was",
"E.",
""
],
[
"Roy",
"D. P.",
""
],
[
"Schmidt",
"C. R.",
""
],
[
"Semenov",
"A.",
""
],
[
"Thomas",
"J.",
""
],
[
"Vivarelli",
"I.",
""
],
[
"Weiglein",
"G.",
""
],
[
"Zeppenfeld",
"D.",
""
]
] |
Report of the Higgs working group for the Workshop `Physics at TeV Colliders', Les Houches, France, 21 May - 1 June 2001. It contains 7 separate sections: A. Theoretical Developments B. Higgs Searches at the Tevatron C. Experimental Observation of an invisible Higgs Boson at LHC D. Search for the Standard Model Higgs Boson using Vector Boson Fusion at the LHC E. Study of the MSSM channel $A/H \to \tau \tau$ at the LHC F. Searching for Higgs Bosons in $t\bar t H$ Production G. Studies of Charged Higgs Boson Signals for the Tevatron and the LHC
|
1202.2426
|
Edoardo Mirabella Dr.
|
Ruth Britto and Edoardo Mirabella
|
Massive particles and unitarity cuts
|
To appear in the proceedings of the LCWS 2011, September 2011,
Granada, Spain
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present an extension of the spinor integration formalism of one loop
amplitudes from the double-cut to the single-cut case. This technique can be
applied for the computation of the tadpole coefficients. Moreover we describe
an off-shell continuation of one loop amplitudes that allows a finite
evaluation of the unitarity cuts in the channel of a single massive external
fermion.
|
[
{
"created": "Sat, 11 Feb 2012 10:03:57 GMT",
"version": "v1"
}
] |
2012-02-14
|
[
[
"Britto",
"Ruth",
""
],
[
"Mirabella",
"Edoardo",
""
]
] |
We present an extension of the spinor integration formalism of one loop amplitudes from the double-cut to the single-cut case. This technique can be applied for the computation of the tadpole coefficients. Moreover we describe an off-shell continuation of one loop amplitudes that allows a finite evaluation of the unitarity cuts in the channel of a single massive external fermion.
|
2312.09290
|
Luigi Favaro
|
Florian Ernst, Luigi Favaro, Claudius Krause, Tilman Plehn, David Shih
|
Normalizing Flows for High-Dimensional Detector Simulations
|
24 pages, 9 figures, 5 tables
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Whenever invertible generative networks are needed for LHC physics,
normalizing flows show excellent performance. A challenge is their scaling to
high-dimensional phase spaces. We investigate their performance for fast
calorimeter shower simulations with increasing phase space dimension. In
addition to the standard architecture we also employ a VAE to compress the
dimensionality. Our study provides benchmarks for invertible networks applied
to the CaloChallenge.
|
[
{
"created": "Thu, 14 Dec 2023 19:00:07 GMT",
"version": "v1"
}
] |
2023-12-18
|
[
[
"Ernst",
"Florian",
""
],
[
"Favaro",
"Luigi",
""
],
[
"Krause",
"Claudius",
""
],
[
"Plehn",
"Tilman",
""
],
[
"Shih",
"David",
""
]
] |
Whenever invertible generative networks are needed for LHC physics, normalizing flows show excellent performance. A challenge is their scaling to high-dimensional phase spaces. We investigate their performance for fast calorimeter shower simulations with increasing phase space dimension. In addition to the standard architecture we also employ a VAE to compress the dimensionality. Our study provides benchmarks for invertible networks applied to the CaloChallenge.
|
1704.05917
|
Vladimir Skokov
|
Adrian Dumitru, Vladimir Skokov
|
Fluctuations of the gluon distribution from the small-x effective action
|
14 pages, 5 figures; v2: added section IV-A to discuss the parametric
dependence of the selected fluctuations on the number of colors and on the
thickness of the target; v3: version accepted to Phys. Rev. D
|
Phys. Rev. D 96, 056029 (2017)
|
10.1103/PhysRevD.96.056029
|
RBRC 1238
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The computation of observables in high energy QCD involves an average over
stochastic semiclassical small-x gluon fields. The weight of various
configurations is determined by the effective action. We introduce a method to
study fluctuations of observables, functionals of the small-x fields, which
does not explicitly involve dipoles. We integrate out those fluctuations of the
gluon field under which a given observable is invariant. Thereby we obtain the
effective potential for that observable describing its fluctuations about the
saddle point. We determine explicitly the effective potential for the covariant
gauge gluon distribution both for the McLerran-Venugopalan (MV) model and for a
(non-local) Gaussian approximation for the small-x effective action. This
provides insight into the correlation of fluctuations of the number of hard
gluons versus their typical transverse momentum. We find that the spectral
shape of the fluctuations of the gluon distribution is fundamentally different
in the MV model, where there is a pile-up of gluons near the saturation scale,
versus the solution of the small-x JIMWLK renormalization group, which
generates essentially scale invariant fluctuations above the absorptive
boundary set by the saturation scale.
|
[
{
"created": "Wed, 19 Apr 2017 20:00:36 GMT",
"version": "v1"
},
{
"created": "Wed, 3 May 2017 20:07:38 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Oct 2017 15:23:20 GMT",
"version": "v3"
}
] |
2017-10-12
|
[
[
"Dumitru",
"Adrian",
""
],
[
"Skokov",
"Vladimir",
""
]
] |
The computation of observables in high energy QCD involves an average over stochastic semiclassical small-x gluon fields. The weight of various configurations is determined by the effective action. We introduce a method to study fluctuations of observables, functionals of the small-x fields, which does not explicitly involve dipoles. We integrate out those fluctuations of the gluon field under which a given observable is invariant. Thereby we obtain the effective potential for that observable describing its fluctuations about the saddle point. We determine explicitly the effective potential for the covariant gauge gluon distribution both for the McLerran-Venugopalan (MV) model and for a (non-local) Gaussian approximation for the small-x effective action. This provides insight into the correlation of fluctuations of the number of hard gluons versus their typical transverse momentum. We find that the spectral shape of the fluctuations of the gluon distribution is fundamentally different in the MV model, where there is a pile-up of gluons near the saturation scale, versus the solution of the small-x JIMWLK renormalization group, which generates essentially scale invariant fluctuations above the absorptive boundary set by the saturation scale.
|
hep-ph/0406067
|
Igor N. Mishustin
|
I. N. Mishustin (1,2,3), L. M. Satarov (1,2), D. Strottman (2,4), and
W. Greiner (2) ((1) Kurchatov Institute, Moscow, (2) Goethe University,
Frankfurt/M, (3) Niels Bohr Institute, Copenhagen, (4) Los Alamos National
Laboratory)
|
Possible production of exotic baryonia in relativistic heavy-ion
collisions
|
8 pages, 1 figure
|
J.Phys. G31 (2005) 803-808
|
10.1088/0954-3899/31/7/022
| null |
hep-ph
| null |
Properties of a hypothetical baryonium with the quark content
($uds\ov{u}\ov{d}\ov{s}$) are discussed. The MIT bag model predicts its mass to
be unexpectedly low, approximately 1210 MeV. Possible hadronic decay modes of
this state are analyzed. Ultrarelativistic heavy-ion collisions provide
favorable conditions for the formation of such particles from the baryon-free
quark-gluon plasma. We estimate multiplicities of such exotic baryonia on the
basis of a simple thermal model.
|
[
{
"created": "Mon, 7 Jun 2004 10:02:57 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Mishustin",
"I. N.",
""
],
[
"Satarov",
"L. M.",
""
],
[
"Strottman",
"D.",
""
],
[
"Greiner",
"W.",
""
]
] |
Properties of a hypothetical baryonium with the quark content ($uds\ov{u}\ov{d}\ov{s}$) are discussed. The MIT bag model predicts its mass to be unexpectedly low, approximately 1210 MeV. Possible hadronic decay modes of this state are analyzed. Ultrarelativistic heavy-ion collisions provide favorable conditions for the formation of such particles from the baryon-free quark-gluon plasma. We estimate multiplicities of such exotic baryonia on the basis of a simple thermal model.
|
hep-ph/0009105
|
Pyungwon Ko
|
S. Baek, J.-H. Jang, P. Ko and J. H. Park (KAIST)
|
Fully supersymmetric CP violations in the kaon system
|
Contribution to the Proceedings of ICHEP2000, Osaka, 2000
| null | null |
KAIST preprint KAIST-TH 2000/12
|
hep-ph
| null |
We show that, on the contrary to the usual claims, fully supersymmetric CP
violations in the kaon system are possible through the gluino mediated flavor
changing interactions. Both $\epsilon_K$ and ${\rm Re} (\epsilon' /
\epsilon_K)$ can be accommodated for relatively large $\tan\beta$ without any
fine tunings or contradictions to the FCNC and EDM constraints.
|
[
{
"created": "Sun, 10 Sep 2000 05:01:08 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Baek",
"S.",
"",
"KAIST"
],
[
"Jang",
"J. -H.",
"",
"KAIST"
],
[
"Ko",
"P.",
"",
"KAIST"
],
[
"Park",
"J. H.",
"",
"KAIST"
]
] |
We show that, on the contrary to the usual claims, fully supersymmetric CP violations in the kaon system are possible through the gluino mediated flavor changing interactions. Both $\epsilon_K$ and ${\rm Re} (\epsilon' / \epsilon_K)$ can be accommodated for relatively large $\tan\beta$ without any fine tunings or contradictions to the FCNC and EDM constraints.
|
hep-ph/0010129
|
Barry R. Holstein
|
Barry R. Holstein
|
Nucleon Polarizabilities
|
13 page Latex file; Talk given at Chiral Dynamics 2000 Workshop,
Jefferson Lab, July 2000
| null |
10.1142/9789812810977_0018
| null |
hep-ph nucl-th
| null |
The subject of nucleon polarizabilities in real, virtual, and doubly virtual
Compton scattering is discussed with respect to what is known and how such
quantities can be extracted from data.
|
[
{
"created": "Thu, 12 Oct 2000 17:11:18 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Holstein",
"Barry R.",
""
]
] |
The subject of nucleon polarizabilities in real, virtual, and doubly virtual Compton scattering is discussed with respect to what is known and how such quantities can be extracted from data.
|
2106.04190
|
Hsiang-nan Li
|
Hsiang-nan Li
|
Glauber gluons in annihilation amplitudes for heavy meson decays
|
10 pages, 3 figures
| null |
10.1016/j.cjph.2021.07.034
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We investigate the Glauber divergences in nonfactorizable annihilation
amplitudes for two-body hadronic heavy meson decays in the $k_T$ factorization
theorem at one-loop level. These divergences can be absorbed into the Glauber
factors in the dominant kinematic regions of small parton momenta, which modify
the interference between a nonfactorizable annihilation amplitude and other
amplitudes by rotating it with a phase. We postulate that only the Glauber
effect associated with a pion is significant, due to its special role as a
$q\bar q$ bound state and as a pseudo Nambu-Goldstone boson simultaneously. It
is elaborated that the data of the $D\to\pi\pi$ and $\pi K$ branching ratios
have revealed prominent Glauber effects. This work provides a solid theoretical
ground for the factorization-assisted topological-amplitude parametrization of
two-body hadronic $D$ meson decays.
|
[
{
"created": "Tue, 8 Jun 2021 09:02:02 GMT",
"version": "v1"
}
] |
2021-09-22
|
[
[
"Li",
"Hsiang-nan",
""
]
] |
We investigate the Glauber divergences in nonfactorizable annihilation amplitudes for two-body hadronic heavy meson decays in the $k_T$ factorization theorem at one-loop level. These divergences can be absorbed into the Glauber factors in the dominant kinematic regions of small parton momenta, which modify the interference between a nonfactorizable annihilation amplitude and other amplitudes by rotating it with a phase. We postulate that only the Glauber effect associated with a pion is significant, due to its special role as a $q\bar q$ bound state and as a pseudo Nambu-Goldstone boson simultaneously. It is elaborated that the data of the $D\to\pi\pi$ and $\pi K$ branching ratios have revealed prominent Glauber effects. This work provides a solid theoretical ground for the factorization-assisted topological-amplitude parametrization of two-body hadronic $D$ meson decays.
|
1506.08364
|
Yevgeny Stadnik
|
Yevgeny V. Stadnik, Victor V. Flambaum
|
New generation low-energy probes for ultralight axion and scalar dark
matter
|
10 pages, Invited brief review for Modern Physics Letters A, Guest
Editor: Maxim Yu. Khlopov
|
Mod. Phys. Lett. A 32, 1740004 (2017)
|
10.1142/S0217732317400041
| null |
hep-ph astro-ph.CO nucl-th physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a brief overview of a new generation of high-precision laboratory
and astrophysical measurements to search for ultralight (sub-eV) axion,
axion-like pseudoscalar and scalar dark matter, which form either a coherent
condensate or topological defects (solitons). In these new detection methods,
the sought effects are linear in the interaction constant between dark matter
and ordinary matter, which is in stark contrast to traditional searches for
dark matter, where the sought effects are quadratic or higher order in the
underlying interaction constants (which are extremely small).
|
[
{
"created": "Sun, 28 Jun 2015 06:38:21 GMT",
"version": "v1"
}
] |
2017-05-30
|
[
[
"Stadnik",
"Yevgeny V.",
""
],
[
"Flambaum",
"Victor V.",
""
]
] |
We present a brief overview of a new generation of high-precision laboratory and astrophysical measurements to search for ultralight (sub-eV) axion, axion-like pseudoscalar and scalar dark matter, which form either a coherent condensate or topological defects (solitons). In these new detection methods, the sought effects are linear in the interaction constant between dark matter and ordinary matter, which is in stark contrast to traditional searches for dark matter, where the sought effects are quadratic or higher order in the underlying interaction constants (which are extremely small).
|
1608.02577
|
Cyrille Marquet
|
C. Marquet, E. Petreska and C. Roiesnel
|
Transverse-momentum-dependent gluon distributions from JIMWLK evolution
|
21 pages, 7 figures, version published in JHEP
|
JHEP 1610:065,2016
|
10.1007/JHEP10(2016)065
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Transverse-momentum-dependent (TMD) gluon distributions have different
operator definitions, depending on the process under consideration. We study
that aspect of TMD factorization in the small-x limit, for the various
unpolarized TMD gluon distributions encountered in the literature. To do this,
we consider di-jet production in hadronic collisions, since this process allows
to be exhaustive with respect to the possible operator definitions, and is
suitable to be investigated at small x. Indeed, for forward and nearly
back-to-back jets, one can apply both the TMD factorization and Color Glass
Condensate (CGC) approaches to compute the di-jet cross-section, and compare
the results. Doing so, we show that both descriptions coincide, and we show how
to express the various TMD gluon distributions in terms of CGC correlators of
Wilson lines, while keeping Nc finite. We then proceed to evaluate them by
solving the JIMWLK equation numerically. We obtain that at large transverse
momentum, the process dependence essentially disappears, while at small
transverse momentum, non-linear saturation effects impact the various TMD gluon
distributions in very different ways. We notice the presence of a geometric
scaling regime for all the TMD gluon distributions studied: the "dipole" one,
the Weizs\"acker-Williams one, and the six others involved in forward di-jet
production.
|
[
{
"created": "Mon, 8 Aug 2016 19:59:54 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Jan 2017 09:46:36 GMT",
"version": "v2"
}
] |
2017-01-10
|
[
[
"Marquet",
"C.",
""
],
[
"Petreska",
"E.",
""
],
[
"Roiesnel",
"C.",
""
]
] |
Transverse-momentum-dependent (TMD) gluon distributions have different operator definitions, depending on the process under consideration. We study that aspect of TMD factorization in the small-x limit, for the various unpolarized TMD gluon distributions encountered in the literature. To do this, we consider di-jet production in hadronic collisions, since this process allows to be exhaustive with respect to the possible operator definitions, and is suitable to be investigated at small x. Indeed, for forward and nearly back-to-back jets, one can apply both the TMD factorization and Color Glass Condensate (CGC) approaches to compute the di-jet cross-section, and compare the results. Doing so, we show that both descriptions coincide, and we show how to express the various TMD gluon distributions in terms of CGC correlators of Wilson lines, while keeping Nc finite. We then proceed to evaluate them by solving the JIMWLK equation numerically. We obtain that at large transverse momentum, the process dependence essentially disappears, while at small transverse momentum, non-linear saturation effects impact the various TMD gluon distributions in very different ways. We notice the presence of a geometric scaling regime for all the TMD gluon distributions studied: the "dipole" one, the Weizs\"acker-Williams one, and the six others involved in forward di-jet production.
|
1210.5074
|
Debasish Borah
|
Debasish Borah and Mrinal Kumar Das
|
Neutrino masses and mixings with non-zero $\theta_{13}$ in Type I+II
Seesaw Models
|
Version 2: 20 pages, 12 figures, 3 tables, Major Revision, Accepted
for publication in Nuclear Physics B. arXiv admin note: substantial text
overlap with arXiv:1209.0280
|
Nuclear Physics B 870, 461 (2013)
|
10.1016/j.nuclphysb.2013.02.002
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the survivability of neutrino mass models with normal as well as
inverted hierarchical mass patterns in the presence of both type I and type II
seesaw contributions to neutrino mass within the framework of generic
left-right symmetric models. At leading order, the Dirac neutrino mass matrix
is assumed to be diagonal with either charged lepton (CL) type or up quark (UQ)
type structure which gets corrected by non-leading effects giving rise to
deviations from tri-bi-maximal (TBM) mixing and hence non-zero value of
$\theta_{13}$. Using the standard form of neutrino mass matrix which
incorporates such non-leading effects, we parametrize the neutrino mass matrix
incorporating both oscillation as well as cosmology data. Also considering
extremal values of Majorana CP phases such that the neutrino mass eigenvalues
have the structure $(m_1, -m_2, m_3)$ and $(m_1, m_2, m_3)$, we then calculate
the predictions for neutrino parameters in the presence of both type I and type
II seesaw contributions, taking one of them dominant and the other
sub-dominant. We show that these mass models can survive in our framework with
certain exceptions.
|
[
{
"created": "Thu, 18 Oct 2012 09:58:02 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Feb 2013 13:19:52 GMT",
"version": "v2"
}
] |
2013-02-27
|
[
[
"Borah",
"Debasish",
""
],
[
"Das",
"Mrinal Kumar",
""
]
] |
We study the survivability of neutrino mass models with normal as well as inverted hierarchical mass patterns in the presence of both type I and type II seesaw contributions to neutrino mass within the framework of generic left-right symmetric models. At leading order, the Dirac neutrino mass matrix is assumed to be diagonal with either charged lepton (CL) type or up quark (UQ) type structure which gets corrected by non-leading effects giving rise to deviations from tri-bi-maximal (TBM) mixing and hence non-zero value of $\theta_{13}$. Using the standard form of neutrino mass matrix which incorporates such non-leading effects, we parametrize the neutrino mass matrix incorporating both oscillation as well as cosmology data. Also considering extremal values of Majorana CP phases such that the neutrino mass eigenvalues have the structure $(m_1, -m_2, m_3)$ and $(m_1, m_2, m_3)$, we then calculate the predictions for neutrino parameters in the presence of both type I and type II seesaw contributions, taking one of them dominant and the other sub-dominant. We show that these mass models can survive in our framework with certain exceptions.
|
1512.06674
|
Sreerup Raychaudhuri
|
Debjyoti Bardhan, Disha Bhatia, Amit Chakraborty, Ushoshi Maitra,
Sreerup Raychaudhuri, Tousik Samui
|
Radion Candidate for the LHC Diphoton Resonance
|
14 pages, pdfLatex, 2 pdf figures, small changes made in text and
some references added
| null | null |
TIFR preprint TIFR-TH/15-45
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The recent observation of a modest excess in diphoton final states at the
LHC, by both the ATLAS and CMS Collaborations, has sparked off the expected
race among theorists to find the right explanation for this proto-resonance,
assuming that the signal will survive and not prove to be yet another
statistical fluctuation. We carry out a general analysis of this `signal' in
the case of a scalar which couples only to pairs of gluons (for production) and
photons (for diphoton decay modes), and establish that an explanation of the
observed resonance, taken together with the null results of new physics
searches in all the other channels, requires a scalar with rather exotic
behaviour. We then demonstrate that a fairly simple-minded extension of the
minimal Randall-Sundrum model can yield a radion candidate which might
reproduce this exotic behaviour.
|
[
{
"created": "Mon, 21 Dec 2015 15:53:08 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jan 2016 14:55:32 GMT",
"version": "v2"
}
] |
2016-01-14
|
[
[
"Bardhan",
"Debjyoti",
""
],
[
"Bhatia",
"Disha",
""
],
[
"Chakraborty",
"Amit",
""
],
[
"Maitra",
"Ushoshi",
""
],
[
"Raychaudhuri",
"Sreerup",
""
],
[
"Samui",
"Tousik",
""
]
] |
The recent observation of a modest excess in diphoton final states at the LHC, by both the ATLAS and CMS Collaborations, has sparked off the expected race among theorists to find the right explanation for this proto-resonance, assuming that the signal will survive and not prove to be yet another statistical fluctuation. We carry out a general analysis of this `signal' in the case of a scalar which couples only to pairs of gluons (for production) and photons (for diphoton decay modes), and establish that an explanation of the observed resonance, taken together with the null results of new physics searches in all the other channels, requires a scalar with rather exotic behaviour. We then demonstrate that a fairly simple-minded extension of the minimal Randall-Sundrum model can yield a radion candidate which might reproduce this exotic behaviour.
|
1202.0896
|
Pitayuth Wongjun
|
Antonio De Felice, Khamphee Karwan, Pitayuth Wongjun
|
Stability of the 3-form field during inflation
|
18 pages, 12 figures, add new informations in V2, correct some typos
in V3
|
Phys. Rev. D 85, 123545 (2012)
|
10.1103/PhysRevD.85.123545
| null |
hep-ph astro-ph.CO gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the minimally coupled 3-form field which has been considered as a
candidate to realize inflation. We have studied the conditions to avoid ghosts
and Laplacian instabilities and found that some classes of potentials, e.g. the
Mexican-hat one, will in general be unstable. We then propose other classes of
potentials which are instead free from any instability, drive a long-enough
slow-roll regime followed by an oscillatory epoch, and as a consequence, can
provide successful inflation. Finally, we also provide stable potentials which
lead to a small enough propagation speed for the scalar perturbations, giving a
possibility for these models to produce non-Gaussianities.
|
[
{
"created": "Sat, 4 Feb 2012 13:58:03 GMT",
"version": "v1"
},
{
"created": "Mon, 14 May 2012 08:05:50 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Jul 2012 15:03:14 GMT",
"version": "v3"
}
] |
2012-07-18
|
[
[
"De Felice",
"Antonio",
""
],
[
"Karwan",
"Khamphee",
""
],
[
"Wongjun",
"Pitayuth",
""
]
] |
We consider the minimally coupled 3-form field which has been considered as a candidate to realize inflation. We have studied the conditions to avoid ghosts and Laplacian instabilities and found that some classes of potentials, e.g. the Mexican-hat one, will in general be unstable. We then propose other classes of potentials which are instead free from any instability, drive a long-enough slow-roll regime followed by an oscillatory epoch, and as a consequence, can provide successful inflation. Finally, we also provide stable potentials which lead to a small enough propagation speed for the scalar perturbations, giving a possibility for these models to produce non-Gaussianities.
|
hep-ph/0505240
|
Brian Cox
|
B. E. Cox, A. De Roeck, V. A. Khoze, T. Pierzchala, M. G. Ryskin, I.
Nasteva, W. J. Stirling and M. Tasevsky
|
Detecting the Standard Model Higgs Boson in the WW decay channel using
forward proton tagging at the LHC
|
12 pages, 6 figures
|
Eur.Phys.J.C45:401-407,2006
|
10.1140/epjc/s2005-02447-x
|
IPPP/05/20, DCPT/05/40, MAN/HEP/2005/2
|
hep-ph
| null |
We present a detailed study of the central exclusive production of the
Standard Model Higgs Boson in the WW decay channel at the LHC. We include
estimates of the experimental acceptance, including that of the proposed proton
tagging detectors at 220m and 420m around either ATLAS and / or CMS, and the
level 1 trigger acceptances. We give first estimates of the photon-photon and
glue-glue background processes in the semi-leptonic and fully-leptonic decay
channels. We find that there will be a detectable signal for Higgs masses
between 140 GeV and 200 GeV, and that the backgrounds should be controllable.
|
[
{
"created": "Fri, 27 May 2005 14:53:29 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Jul 2005 15:53:13 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Dec 2005 15:02:38 GMT",
"version": "v3"
}
] |
2009-01-07
|
[
[
"Cox",
"B. E.",
""
],
[
"De Roeck",
"A.",
""
],
[
"Khoze",
"V. A.",
""
],
[
"Pierzchala",
"T.",
""
],
[
"Ryskin",
"M. G.",
""
],
[
"Nasteva",
"I.",
""
],
[
"Stirling",
"W. J.",
""
],
[
"Tasevsky",
"M.",
""
]
] |
We present a detailed study of the central exclusive production of the Standard Model Higgs Boson in the WW decay channel at the LHC. We include estimates of the experimental acceptance, including that of the proposed proton tagging detectors at 220m and 420m around either ATLAS and / or CMS, and the level 1 trigger acceptances. We give first estimates of the photon-photon and glue-glue background processes in the semi-leptonic and fully-leptonic decay channels. We find that there will be a detectable signal for Higgs masses between 140 GeV and 200 GeV, and that the backgrounds should be controllable.
|
2304.05415
|
Oliver Scholer
|
Oliver Scholer, Jordy de Vries, Luk\'a\v{s} Gr\'af
|
$\nu$DoBe -- A Python Tool for Neutrinoless Double Beta Decay
|
79 Pages, 6 Tables, 19 Figures, Download:
https://github.com/OScholer/nudobe , Online-Tool:
https://nudobe.streamlit.app
| null |
10.1007/JHEP08(2023)043
| null |
hep-ph hep-ex nucl-ex nucl-th
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
We present $\nu$DoBe, a Python tool for the computation of neutrinoless
double beta decay ($0\nu\beta\beta$) rates in terms of lepton-number-violating
operators in the Standard Model Effective Field Theory (SMEFT). The tool can be
used for automated calculations of $0\nu\beta\beta$ rates, electron spectra and
angular correlations for all isotopes of experimental interest, for
lepton-number-violating operators up to and including dimension 9. The tool
takes care of renormalization-group running to lower energies and provides the
matching to the low-energy effective field theory and, at lower scales, to a
chiral effective field theory description of $0\nu\beta\beta$ rates. The user
can specify different sets of nuclear matrix elements from various many-body
methods and hadronic low-energy constants. The tool can be used to quickly
generate analytical and numerical expressions for $0\nu\beta\beta$ rates and to
generate a large variety of plots. In this work, we provide examples of
possible use along with a detailed code documentation. The code can be accessed
through:
GitHub: https://github.com/OScholer/nudobe
Online User-Interface: https://nudobe.streamlit.app
|
[
{
"created": "Tue, 11 Apr 2023 18:00:01 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Sep 2023 11:14:51 GMT",
"version": "v2"
}
] |
2023-09-14
|
[
[
"Scholer",
"Oliver",
""
],
[
"de Vries",
"Jordy",
""
],
[
"Gráf",
"Lukáš",
""
]
] |
We present $\nu$DoBe, a Python tool for the computation of neutrinoless double beta decay ($0\nu\beta\beta$) rates in terms of lepton-number-violating operators in the Standard Model Effective Field Theory (SMEFT). The tool can be used for automated calculations of $0\nu\beta\beta$ rates, electron spectra and angular correlations for all isotopes of experimental interest, for lepton-number-violating operators up to and including dimension 9. The tool takes care of renormalization-group running to lower energies and provides the matching to the low-energy effective field theory and, at lower scales, to a chiral effective field theory description of $0\nu\beta\beta$ rates. The user can specify different sets of nuclear matrix elements from various many-body methods and hadronic low-energy constants. The tool can be used to quickly generate analytical and numerical expressions for $0\nu\beta\beta$ rates and to generate a large variety of plots. In this work, we provide examples of possible use along with a detailed code documentation. The code can be accessed through: GitHub: https://github.com/OScholer/nudobe Online User-Interface: https://nudobe.streamlit.app
|
1905.02203
|
Andreas Weiler
|
Javi Serra, Stefan Stelzl, Riccardo Torre, and Andreas Weiler
|
Hypercharged Naturalness
|
37 pages, 7 figures
| null |
10.1007/JHEP10(2019)060
|
TUM-HEP-1199/19, CERN-TH-2019-064
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present an exceptional twin-Higgs model with the minimal symmetry
structure for an exact implementation of twin parity along with custodial
symmetry. Twin particles are mirrors of the Standard Model yet they carry
hypercharge, while the photon is identified with its twin. We thoroughly
explore the phenomenological signatures of hypercharged naturalness: long-lived
charged particles, a colorless twin top with electric charge $2/3$ that once
pair-produced, bounds via twin-color interactions and can annihilate to
dileptons or a Higgs plus a photon or a $Z$, and glueballs produced from Higgs
decays and twin-quarkonium annihilation that either decay displaced, or are
stable on collider scales and eventually decay to diphotons. Prospects for
detection of these signatures are also discussed.
|
[
{
"created": "Mon, 6 May 2019 18:00:00 GMT",
"version": "v1"
}
] |
2020-01-08
|
[
[
"Serra",
"Javi",
""
],
[
"Stelzl",
"Stefan",
""
],
[
"Torre",
"Riccardo",
""
],
[
"Weiler",
"Andreas",
""
]
] |
We present an exceptional twin-Higgs model with the minimal symmetry structure for an exact implementation of twin parity along with custodial symmetry. Twin particles are mirrors of the Standard Model yet they carry hypercharge, while the photon is identified with its twin. We thoroughly explore the phenomenological signatures of hypercharged naturalness: long-lived charged particles, a colorless twin top with electric charge $2/3$ that once pair-produced, bounds via twin-color interactions and can annihilate to dileptons or a Higgs plus a photon or a $Z$, and glueballs produced from Higgs decays and twin-quarkonium annihilation that either decay displaced, or are stable on collider scales and eventually decay to diphotons. Prospects for detection of these signatures are also discussed.
|
2012.14411
|
Cem Salih Un
|
K. S. Babu, Ilia Gogoladze, Cem Salih Un
|
Proton Lifetime in Minimal SUSY SU(5) in Light of LHC Results
| null |
Journal of High Energy Physics, 02 (2022), 164
|
10.1007/JHEP02(2022)164
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We examine proton decay mediated by color-triplet Higgsinos in minimal
supersymmetric $SU(5)$ grand unified theory in light of the discovery of the
Higgs boson and the absence of SUSY signals at the LHC. We pay special
attention to various threshold effects arising from Planck-suppressed operators
that affect the color-triplet Higgsino mass and also correct the wrong mass
relations for the light fermions. Our analysis allows for a non-universal SUSY
spectrum with the third family scalars having a separate mass compared to the
first two families. We identify the allowed parameter space of the model and
show that the SUSY scalar masses are constrained by current limits from proton
lifetime to be above 5 TeV, while the glunio, Wino and the Higgsinos may be
within reach of the LHC. When the SUSY scalar masses are required to be $\leq
20$ TeV, so that they are within reach of next generation collider experiments,
we find that proton lifetime for the decay $p \rightarrow \overline{\nu} K^+$
is bounded by $\tau(p \rightarrow \overline{\nu} K^+) \leq 1.1 \times 10^{35}$
yrs.
|
[
{
"created": "Mon, 28 Dec 2020 18:43:24 GMT",
"version": "v1"
},
{
"created": "Sun, 31 Jan 2021 20:30:17 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Nov 2021 19:12:16 GMT",
"version": "v3"
},
{
"created": "Thu, 24 Feb 2022 22:06:18 GMT",
"version": "v4"
}
] |
2022-02-28
|
[
[
"Babu",
"K. S.",
""
],
[
"Gogoladze",
"Ilia",
""
],
[
"Un",
"Cem Salih",
""
]
] |
We examine proton decay mediated by color-triplet Higgsinos in minimal supersymmetric $SU(5)$ grand unified theory in light of the discovery of the Higgs boson and the absence of SUSY signals at the LHC. We pay special attention to various threshold effects arising from Planck-suppressed operators that affect the color-triplet Higgsino mass and also correct the wrong mass relations for the light fermions. Our analysis allows for a non-universal SUSY spectrum with the third family scalars having a separate mass compared to the first two families. We identify the allowed parameter space of the model and show that the SUSY scalar masses are constrained by current limits from proton lifetime to be above 5 TeV, while the glunio, Wino and the Higgsinos may be within reach of the LHC. When the SUSY scalar masses are required to be $\leq 20$ TeV, so that they are within reach of next generation collider experiments, we find that proton lifetime for the decay $p \rightarrow \overline{\nu} K^+$ is bounded by $\tau(p \rightarrow \overline{\nu} K^+) \leq 1.1 \times 10^{35}$ yrs.
|
0709.1553
|
Bernard Pire
|
B. Pire and L. Szymanowski
|
Probing Transversity GPDs in Photo and Electroproduction of Two Vector
Mesons
|
3 pages, 5 figures, to be published in the proceedings of the
International Conference on the Structure and Interactions of the Photon
(Photon 2007) Paris, july 2007
|
Nucl.Phys.Proc.Suppl.184:243-246,2008
|
10.1016/j.nuclphysbps.2008.09.173
|
CPhT- PC 092.0807
|
hep-ph nucl-th
| null |
Electroproduction of two mesons well separated in rapidity allows the first
feasible selective access to chiral-odd transversity GPDs provided one of these
mesons is a transversely polarized vector meson rho_T.
|
[
{
"created": "Tue, 11 Sep 2007 08:57:42 GMT",
"version": "v1"
}
] |
2008-12-18
|
[
[
"Pire",
"B.",
""
],
[
"Szymanowski",
"L.",
""
]
] |
Electroproduction of two mesons well separated in rapidity allows the first feasible selective access to chiral-odd transversity GPDs provided one of these mesons is a transversely polarized vector meson rho_T.
|
2005.02288
|
Alessandro Bacchetta
|
Alessandro Bacchetta, Francesco Giovanni Celiberto, Marco Radici,
Pieter Taels
|
Transverse-momentum-dependent gluon distribution functions in a
spectator model
|
Small changes in the text. Correction after Eq. (5). Eq. (6) added.
Fig. 1 slightly modified. Some references added. All results unchanged
| null |
10.1140/epjc/s10052-020-8327-6
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a model calculation of transverse-momentum-dependent distributions
(TMDs) of gluons in the nucleon. The model is based on the assumption that a
nucleon can emit a gluon, and what remains after the emission is treated as a
single spectator particle. This spectator particle is considered to be
on-shell, but its mass is allowed to take a continuous range of values,
described by a spectral function. The nucleon-gluon-spectator coupling is
described by an effective vertex containing two form factors. We fix the model
parameters to obtain the best agreement with collinear gluon distributions
extracted from global fits. We study the tomography in momentum space of gluons
inside nucleons for various combinations of their polarizations. These can be
used to make predictions of observables relevant for gluon TMD studies at
current and future collider facilities.
|
[
{
"created": "Tue, 5 May 2020 15:42:10 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Dec 2020 12:10:01 GMT",
"version": "v2"
}
] |
2020-12-08
|
[
[
"Bacchetta",
"Alessandro",
""
],
[
"Celiberto",
"Francesco Giovanni",
""
],
[
"Radici",
"Marco",
""
],
[
"Taels",
"Pieter",
""
]
] |
We present a model calculation of transverse-momentum-dependent distributions (TMDs) of gluons in the nucleon. The model is based on the assumption that a nucleon can emit a gluon, and what remains after the emission is treated as a single spectator particle. This spectator particle is considered to be on-shell, but its mass is allowed to take a continuous range of values, described by a spectral function. The nucleon-gluon-spectator coupling is described by an effective vertex containing two form factors. We fix the model parameters to obtain the best agreement with collinear gluon distributions extracted from global fits. We study the tomography in momentum space of gluons inside nucleons for various combinations of their polarizations. These can be used to make predictions of observables relevant for gluon TMD studies at current and future collider facilities.
|
1610.03997
|
Jinmian Li
|
P. Ko, Jinmian Li
|
Interference effects of two scalar boson propagators on the LHC search
for the singlet fermion DM
|
16 pages, 8 figures; published version
|
Phys. Lett. B 765 (2017) 53-61
|
10.1016/j.physletb.2016.11.056
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A gauge invariant UV-completion for singlet fermion DM interacting with the
standard model (SM) particles involves a new singlet scalar. Therefore the
model contains two scalar mediators, mixtures of the SM Higgs boson and a
singlet scalar boson. Collider phenomenology of the interference effect between
these two scalar propagators is studied in this work. This interference effect
can be either constructive or destructive in the DM production cross section
depending on both singlet scalar and DM masses, and it will soften the final
state jets in the full mass region. Applying the CMS mono-jet search to our
model, we find the interference effect plays a very important role in the DM
search sensitivity, and the DM production cross section of our model is more
than one order of magnitude below the LHC sensitivity at current stage.
|
[
{
"created": "Thu, 13 Oct 2016 09:50:29 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Dec 2016 04:52:51 GMT",
"version": "v2"
}
] |
2016-12-14
|
[
[
"Ko",
"P.",
""
],
[
"Li",
"Jinmian",
""
]
] |
A gauge invariant UV-completion for singlet fermion DM interacting with the standard model (SM) particles involves a new singlet scalar. Therefore the model contains two scalar mediators, mixtures of the SM Higgs boson and a singlet scalar boson. Collider phenomenology of the interference effect between these two scalar propagators is studied in this work. This interference effect can be either constructive or destructive in the DM production cross section depending on both singlet scalar and DM masses, and it will soften the final state jets in the full mass region. Applying the CMS mono-jet search to our model, we find the interference effect plays a very important role in the DM search sensitivity, and the DM production cross section of our model is more than one order of magnitude below the LHC sensitivity at current stage.
|
1610.06211
|
Marta Luszczak Mrs
|
Marta {\L}uszczak, Antoni Szczurek
|
Diffractive processes at the LHC within $k_t$ -factorization approach
|
7 pages, 7 figures, talk given by M. {\L}uszczak at the Low-X Meeting
2016, 6-11 June 2016, K\'aroly R\'obert College, Gy\"ongy\"os, Hungary. arXiv
admin note: text overlap with arXiv:1606.09499
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the single diffractive production of $c \bar c$ pairs and charmed
mesons at the LHC. In addition to standard collinear approach, for a first time
we propose a $k_t$-factorization approach to the diffractive processes. The
transverse momentum dependent (the unintegrated diffractive parton
distributions) in proton are obtained with the help of the Kimber-Martin-Ryskin
prescription where collinear diffractive PDFs are used as input. In this
calculation the transverse momentum of the pomeron is neglected with respect to
transverse momentum of partons entering the hard process. The results of the
new approach are compared with those of the standard collinear one.
Significantly larger cross sections are obtained in the $k_t$-factorization
approach where some part of higher-order effects is effectively included. Some
correlation observables, like azimuthal angle correlation between $c$ and $\bar
c$, and $c \bar c$ pair transverse momentum distribution were obtained for the
first time.
|
[
{
"created": "Wed, 19 Oct 2016 20:54:46 GMT",
"version": "v1"
}
] |
2016-10-21
|
[
[
"Łuszczak",
"Marta",
""
],
[
"Szczurek",
"Antoni",
""
]
] |
We discuss the single diffractive production of $c \bar c$ pairs and charmed mesons at the LHC. In addition to standard collinear approach, for a first time we propose a $k_t$-factorization approach to the diffractive processes. The transverse momentum dependent (the unintegrated diffractive parton distributions) in proton are obtained with the help of the Kimber-Martin-Ryskin prescription where collinear diffractive PDFs are used as input. In this calculation the transverse momentum of the pomeron is neglected with respect to transverse momentum of partons entering the hard process. The results of the new approach are compared with those of the standard collinear one. Significantly larger cross sections are obtained in the $k_t$-factorization approach where some part of higher-order effects is effectively included. Some correlation observables, like azimuthal angle correlation between $c$ and $\bar c$, and $c \bar c$ pair transverse momentum distribution were obtained for the first time.
|
0810.4918
|
Ahmed Ismail
|
Bruce A. Campbell and Ahmed Ismail
|
Leptonic Pion Decay And Physics Beyond The Electroweak Standard Model
|
31 pages, 3 figures
| null | null |
CERN-PH-TH/2008-212
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The ratio of branching ratios in leptonic pion decay $R_{\pi} \equiv
(\Gamma(\pi^- \to e \nu_e))/(\Gamma(\pi^- \to \mu \nu_\mu))$ is a powerfully
sensitive probe of new interactions beyond the electroweak standard model. This
is due to the chirality suppression of the standard model amplitude for the
decay, which results in a precise prediction for the ratio, and suppressed
amplitudes for new contributions to interfere with. We calculate, including QCD
corrections, the contributions to $R_{\pi}$ arising from a broad selection of
standard model extensions to which it is sensitive, including: R-parity
violating interactions in supersymmetric theories, theories with light
(electroweak scale) leptoquark degrees of freedom, non-minimal models of extra
doublet Higgs bosons, models in which the quarks and leptons are composite both
with and without supersymmetry, and models with strong TeV scale gravitational
interactions. Comparing with existing measurements of $R_{\pi}$ we provide
limits on each of these classes of models; our calculations also represent
state of the art theoretical benchmarks against which the results from the
upcoming round of leptonic pion decay experiments may be compared.
|
[
{
"created": "Mon, 27 Oct 2008 19:56:27 GMT",
"version": "v1"
}
] |
2008-10-28
|
[
[
"Campbell",
"Bruce A.",
""
],
[
"Ismail",
"Ahmed",
""
]
] |
The ratio of branching ratios in leptonic pion decay $R_{\pi} \equiv (\Gamma(\pi^- \to e \nu_e))/(\Gamma(\pi^- \to \mu \nu_\mu))$ is a powerfully sensitive probe of new interactions beyond the electroweak standard model. This is due to the chirality suppression of the standard model amplitude for the decay, which results in a precise prediction for the ratio, and suppressed amplitudes for new contributions to interfere with. We calculate, including QCD corrections, the contributions to $R_{\pi}$ arising from a broad selection of standard model extensions to which it is sensitive, including: R-parity violating interactions in supersymmetric theories, theories with light (electroweak scale) leptoquark degrees of freedom, non-minimal models of extra doublet Higgs bosons, models in which the quarks and leptons are composite both with and without supersymmetry, and models with strong TeV scale gravitational interactions. Comparing with existing measurements of $R_{\pi}$ we provide limits on each of these classes of models; our calculations also represent state of the art theoretical benchmarks against which the results from the upcoming round of leptonic pion decay experiments may be compared.
|
hep-ph/9604398
|
Randy Kobes
|
P. Aurenche, F. Gelis, R. Kobes, E. Petitgirard
|
Enhanced photon production rate on the light--cone
|
17 pages, RevTeX, 4 uuencoded figures included by epsf, also
available at http://theory.uwinnipeg.ca/users/randy/webfiles/soft.uu
|
Phys.Rev. D54 (1996) 5274-5279
|
10.1103/PhysRevD.54.5274
|
ENSLAPP-A-586/96; FISIST/4-96/CFIF; WIN-96-05
|
hep-ph
| null |
Recent studies of the high temperature soft photon production rate on the
light--cone using Braaten--Pisarski resummation techniques have found collinear
divergences present. We show that there exist a class of terms outside the
Braaten--Pisarski framework which, although also divergent, dominate over these
previously considered terms. The divergences in these new terms may be
alleviated by application of a recently developed resummation scheme for
processes sensitive to the light--cone.
|
[
{
"created": "Wed, 24 Apr 1996 17:56:51 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Aurenche",
"P.",
""
],
[
"Gelis",
"F.",
""
],
[
"Kobes",
"R.",
""
],
[
"Petitgirard",
"E.",
""
]
] |
Recent studies of the high temperature soft photon production rate on the light--cone using Braaten--Pisarski resummation techniques have found collinear divergences present. We show that there exist a class of terms outside the Braaten--Pisarski framework which, although also divergent, dominate over these previously considered terms. The divergences in these new terms may be alleviated by application of a recently developed resummation scheme for processes sensitive to the light--cone.
|
hep-ph/9511288
|
Ralf Hempfling
|
Ralf Hempfling
|
Neutrino Masses and Mixing Angles in SUSY-GUT Theories with explicit
R-Parity Breaking
|
Revised version as published in Nucl. Phys. B; several typos
corrected
|
Nucl.Phys. B478 (1996) 3-30
|
10.1016/0550-3213(96)00412-9
| null |
hep-ph
| null |
In minimal SUSY GUT models the $R$-parity breaking terms are severely
constrained by SU(5) gauge invariance. We consider the particular case where
the explicit $R$-parity breaking occurs only via dimension 2 terms of the
superpotential. This model possesses only three R-parity breaking parameters.
We have studied the predictions of this model for the neutrino masses and
mixing angles at the one-loop level within the framework of a radiatively
broken unified supergravity model. We find that this model naturally yields
masses and mixing angles that can explain the solar and atmospheric neutrino
problems. In addition, there are regions in parameter space where the solution
to the solar neutrino puzzle is compatible with either the LSND result or the
existence of significant hot dark matter neutrinos.
|
[
{
"created": "Fri, 10 Nov 1995 12:24:10 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Nov 1995 16:09:51 GMT",
"version": "v2"
},
{
"created": "Tue, 10 Sep 1996 17:16:22 GMT",
"version": "v3"
}
] |
2009-10-28
|
[
[
"Hempfling",
"Ralf",
""
]
] |
In minimal SUSY GUT models the $R$-parity breaking terms are severely constrained by SU(5) gauge invariance. We consider the particular case where the explicit $R$-parity breaking occurs only via dimension 2 terms of the superpotential. This model possesses only three R-parity breaking parameters. We have studied the predictions of this model for the neutrino masses and mixing angles at the one-loop level within the framework of a radiatively broken unified supergravity model. We find that this model naturally yields masses and mixing angles that can explain the solar and atmospheric neutrino problems. In addition, there are regions in parameter space where the solution to the solar neutrino puzzle is compatible with either the LSND result or the existence of significant hot dark matter neutrinos.
|
hep-ph/9708228
|
GLin
|
W.-S. Hou, G.-L. Lin and C.-Y. Ma
|
Flavor Changing Neutral Higgs Couplings and Top-Charm Production at Next
Linear Collider
|
REVTEX, 18 pages, 7 figures; Report number changed
|
Phys.Rev. D56 (1997) 7434-7443
|
10.1103/PhysRevD.56.7434
|
NTUTH-97-10, NCTU-TH-97-04
|
hep-ph
| null |
We explore the possibility of detecting flavor changing neutral Higgs
couplings at the Next Linear Collider (NLC) through $e^+e^-\to \nu_e\bar{\nu_e}
t\bar{c}$. In the framework of a general two-Higgs doublet model, we perform a
complete calculation and find that $\sigma (e^+e^-\to \nu_e\nu_e t\bar{c},
\nu_e\bar{\nu_e} {\bar t}c)$ could reach $\sim 9$ fb for $\sqrt{s}=2 TeV$. This
amounts to an annual production of 500 $t\bar{c}$ plus $\bar{t}c$ pairs at the
NLC with an integrated luminosity of 50 fb$^{-1}$. The dependence of
$tc$-production rate on the neutral scalar mixing angle is mild except when
$\sin^2\alpha \to 0 or 1$. The $\nu\nu W^+W^-$ background should be manageable
after $b$-tagging, while $\nu\nu t\bar t$ background should not be a problem
when the signal event rate is still interesting. The process, together with
$e^+e^-\to \nu_e\bar{\nu_e} W^+W^-, \nu_e\bar{\nu_e} ZZ$ studies, offer the
chance of measuring the $t$-$c$-Higgs coupling.
|
[
{
"created": "Mon, 4 Aug 1997 07:22:36 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Aug 1997 02:56:49 GMT",
"version": "v2"
}
] |
2009-10-30
|
[
[
"Hou",
"W. -S.",
""
],
[
"Lin",
"G. -L.",
""
],
[
"Ma",
"C. -Y.",
""
]
] |
We explore the possibility of detecting flavor changing neutral Higgs couplings at the Next Linear Collider (NLC) through $e^+e^-\to \nu_e\bar{\nu_e} t\bar{c}$. In the framework of a general two-Higgs doublet model, we perform a complete calculation and find that $\sigma (e^+e^-\to \nu_e\nu_e t\bar{c}, \nu_e\bar{\nu_e} {\bar t}c)$ could reach $\sim 9$ fb for $\sqrt{s}=2 TeV$. This amounts to an annual production of 500 $t\bar{c}$ plus $\bar{t}c$ pairs at the NLC with an integrated luminosity of 50 fb$^{-1}$. The dependence of $tc$-production rate on the neutral scalar mixing angle is mild except when $\sin^2\alpha \to 0 or 1$. The $\nu\nu W^+W^-$ background should be manageable after $b$-tagging, while $\nu\nu t\bar t$ background should not be a problem when the signal event rate is still interesting. The process, together with $e^+e^-\to \nu_e\bar{\nu_e} W^+W^-, \nu_e\bar{\nu_e} ZZ$ studies, offer the chance of measuring the $t$-$c$-Higgs coupling.
|
hep-ph/9910560
|
Anne-Christine Davis
|
Brandon Carter and Anne-Christine Davis
|
Chiral Vortons and Cosmological Constraints on Particle Physics
|
minor corrections made. This version will appear in PRD
|
Phys.Rev. D61 (2000) 123501
|
10.1103/PhysRevD.61.123501
|
DAMTP-1999-158
|
hep-ph astro-ph
| null |
We investigate the cosmological consequences of particle physics theories
that admit stable loops of current-carrying string - vortons. In particular, we
consider chiral theories where a single fermion zero mode is excited in the
string core, such as those arising in supersymmetric theories with a D-term.
The resulting vortons formed in such theories are expected to be more stable
than their non-chiral cousins. General symmetry breaking schemes are considered
in which strings formed at one symmetry breaking scale become current-carrying
at a subsequent phase transition. The vorton abundance is estimated and
constraints placed on the underlying particle physics theories from
cosmological observations. Our constraints on the chiral theory are
considerably more stringent than the previous estimates for more general
theories.
|
[
{
"created": "Mon, 1 Nov 1999 14:46:19 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Apr 2000 15:25:36 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Carter",
"Brandon",
""
],
[
"Davis",
"Anne-Christine",
""
]
] |
We investigate the cosmological consequences of particle physics theories that admit stable loops of current-carrying string - vortons. In particular, we consider chiral theories where a single fermion zero mode is excited in the string core, such as those arising in supersymmetric theories with a D-term. The resulting vortons formed in such theories are expected to be more stable than their non-chiral cousins. General symmetry breaking schemes are considered in which strings formed at one symmetry breaking scale become current-carrying at a subsequent phase transition. The vorton abundance is estimated and constraints placed on the underlying particle physics theories from cosmological observations. Our constraints on the chiral theory are considerably more stringent than the previous estimates for more general theories.
|
1704.04467
|
Adith Ramamurti
|
Adith Ramamurti, Edward Shuryak
|
An Effective Model of QCD Monopoles
|
4 pages, 3 figures. Proceeding based on talk given at the XXVIth
International Conference on Ultrarelativistic Nucleus-Nucleus Collisions
(Quark Matter 2017)
| null |
10.1016/j.nuclphysa.2017.04.045
| null |
hep-ph hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, we carried out quantum many-body studies of magnetic monopole
ensembles through numerical simulations of the path integral for one- and
two-component Coulomb Bose systems. We found the relation between the critical
temperature for the Bose-Einstein condensation phase transition and the Coulomb
coupling strength using two methods, the finite-size scaling of the superfluid
fraction and statistical analysis of permutation cycles. After finding
parameters that match the correlation functions measured in our system with the
correlation functions previously measured on the lattice, we arrived at an
effective quantum model of color magnetic monopoles in QCD. From this matched
model, we were able to extract the monopole contribution to QCD equation of
state near $T_\text{c}$.
|
[
{
"created": "Fri, 14 Apr 2017 16:16:14 GMT",
"version": "v1"
}
] |
2018-03-14
|
[
[
"Ramamurti",
"Adith",
""
],
[
"Shuryak",
"Edward",
""
]
] |
In this work, we carried out quantum many-body studies of magnetic monopole ensembles through numerical simulations of the path integral for one- and two-component Coulomb Bose systems. We found the relation between the critical temperature for the Bose-Einstein condensation phase transition and the Coulomb coupling strength using two methods, the finite-size scaling of the superfluid fraction and statistical analysis of permutation cycles. After finding parameters that match the correlation functions measured in our system with the correlation functions previously measured on the lattice, we arrived at an effective quantum model of color magnetic monopoles in QCD. From this matched model, we were able to extract the monopole contribution to QCD equation of state near $T_\text{c}$.
|
hep-ph/9211269
| null |
S.M. Bilenky and C. Giunti
|
See-Saw Type Mixing and $ \nu_{\mu} \to \nu_{\tau} $ Oscillations
|
DFTT 66/92. LaTeX file, 7 pages, no figures
|
Phys.Lett. B300 (1993) 137-140
|
10.1016/0370-2693(93)90760-F
| null |
hep-ph
| null |
We consider $ \nu_{\mu} \to \nu_{\tau} $ oscillations under the assumption
that there is a see-saw type mixing of the light neutrinos with heavy Majorana
particles. It is shown that the existing data, including the recent LEP data,
do not exclude the possibility that the additional terms in the transition
probability due to this mixing could be of the same order of magnitude as the
usual oscillating term. Detail investigations of $ \nu_{\mu} \to \nu_{\tau} $
transitions in future CERN and Fermilab experiments could allow to get
informations not only about the neutrino masses and mixing but also about the
mixing of neutrinos with heavy Majorana particles.
|
[
{
"created": "Wed, 18 Nov 1992 18:03:00 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Bilenky",
"S. M.",
""
],
[
"Giunti",
"C.",
""
]
] |
We consider $ \nu_{\mu} \to \nu_{\tau} $ oscillations under the assumption that there is a see-saw type mixing of the light neutrinos with heavy Majorana particles. It is shown that the existing data, including the recent LEP data, do not exclude the possibility that the additional terms in the transition probability due to this mixing could be of the same order of magnitude as the usual oscillating term. Detail investigations of $ \nu_{\mu} \to \nu_{\tau} $ transitions in future CERN and Fermilab experiments could allow to get informations not only about the neutrino masses and mixing but also about the mixing of neutrinos with heavy Majorana particles.
|
hep-ph/9708495
|
M. D. Williams
|
B.C. Allanach, H. Dreiner, P. Morawitz and M.D.Williams
|
Single Sneutrino/Slepton Production at LEP2 and the NLC
|
10 pages, LaTeX and 5 encapsulated postscript figures. Requires
axodraw macro
|
Phys.Lett.B420:307-313,1998
|
10.1016/S0370-2693(97)01559-1
| null |
hep-ph
| null |
We propose a new method of detecting supersymmetry at LEP2 when R-parity is
violated by an LLE operator. We consider the processes $e\gamma\ra\snu_j e_k$
and $e\gamma \ra \slep_k \bar{\nu}_j$. These are sensitive to seven of the nine
LLE-operators. A Monte-Carlo analysis is performed to investigate the
sensitivity to the sneutrino signal, and the 5$\sigma$ discovery contours in
the mass vs. coupling plane are presented. For an integrated luminosity of 100
pb^-1, sneutrinos with masses up to 170 GeV/c^2 could be discovered in the near
future at LEP2. For the charged slepton production the cross-section is too low
to be detectable.
|
[
{
"created": "Fri, 29 Aug 1997 17:10:34 GMT",
"version": "v1"
}
] |
2011-07-19
|
[
[
"Allanach",
"B. C.",
""
],
[
"Dreiner",
"H.",
""
],
[
"Morawitz",
"P.",
""
],
[
"Williams",
"M. D.",
""
]
] |
We propose a new method of detecting supersymmetry at LEP2 when R-parity is violated by an LLE operator. We consider the processes $e\gamma\ra\snu_j e_k$ and $e\gamma \ra \slep_k \bar{\nu}_j$. These are sensitive to seven of the nine LLE-operators. A Monte-Carlo analysis is performed to investigate the sensitivity to the sneutrino signal, and the 5$\sigma$ discovery contours in the mass vs. coupling plane are presented. For an integrated luminosity of 100 pb^-1, sneutrinos with masses up to 170 GeV/c^2 could be discovered in the near future at LEP2. For the charged slepton production the cross-section is too low to be detectable.
|
2304.01684
|
Duojie Jia
|
Ting-Qi Yan, Wen-Xuan Zhang and Duojie Jia
|
Mass spectra of hidden heavy-flavor tetraquarks with two and four heavy
quarks
| null |
Euro. Phys. J. C 83 (2023) 810
|
10.1140/epjc/s10052-023-11956-3
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Inspired by the observation of the $X(6900)$ by LHCb and the $X(6600)$ (with
mass $6552\pm 10$ $\pm 12$ MeV) recently by CMS and ATLAS experiments of the
LHC in the di-$J/\Psi $ invariant mass spectrum, we systemically study masses
of all ground-state configurations of the hidden heavy-flavor tetraquarks
$q_{1}Q_{2}\bar{q}_{3}\bar{Q}_{4}$ and $Q_{1}Q_{2}\bar{Q}_{3}\bar{Q}_{4}$
($Q=c,b$;$q=u,d,s$) contaning two and four heavy quarks in the MIT bag model
with chromomagnetic interaction and enhanced binding energy. Considering
color-spin mixing due to chromomagnetic interaction, our mass computation
indicates that the observed $X(6600)$ is likely to be the $0^{++}$ ground
states of hidden-charm tetraquark $cc\bar{c}\bar{c}$ with computed masses
$6572$ MeV, which has a $0^{++}$ color partner around $6469$ MeV. The fully
bottom system of tetraquark $bb\bar{b}\bar{b}$ has masses of 19685 MeV and
19717 MeV for the the $0^{++}$ ground states. Further computation is given to
the tetraquark systems $sc\bar{s}\bar{c}$, $sb\bar{s}\bar{b}$,
$cb\bar{c}\bar{b}$, $nc\bar{n}\bar{c}$ and $nb\bar{n}\bar{b}$, suggesting that
the $Z_{c}(4200)$ is the tetraquark $nc\bar{n}\bar{c}$ with $J^{PC}=1^{+-}$.
All of these tetraquarks are above their lowest thresholds of two mesons and
unstable against the strong decays.
|
[
{
"created": "Tue, 4 Apr 2023 10:21:25 GMT",
"version": "v1"
}
] |
2023-09-14
|
[
[
"Yan",
"Ting-Qi",
""
],
[
"Zhang",
"Wen-Xuan",
""
],
[
"Jia",
"Duojie",
""
]
] |
Inspired by the observation of the $X(6900)$ by LHCb and the $X(6600)$ (with mass $6552\pm 10$ $\pm 12$ MeV) recently by CMS and ATLAS experiments of the LHC in the di-$J/\Psi $ invariant mass spectrum, we systemically study masses of all ground-state configurations of the hidden heavy-flavor tetraquarks $q_{1}Q_{2}\bar{q}_{3}\bar{Q}_{4}$ and $Q_{1}Q_{2}\bar{Q}_{3}\bar{Q}_{4}$ ($Q=c,b$;$q=u,d,s$) contaning two and four heavy quarks in the MIT bag model with chromomagnetic interaction and enhanced binding energy. Considering color-spin mixing due to chromomagnetic interaction, our mass computation indicates that the observed $X(6600)$ is likely to be the $0^{++}$ ground states of hidden-charm tetraquark $cc\bar{c}\bar{c}$ with computed masses $6572$ MeV, which has a $0^{++}$ color partner around $6469$ MeV. The fully bottom system of tetraquark $bb\bar{b}\bar{b}$ has masses of 19685 MeV and 19717 MeV for the the $0^{++}$ ground states. Further computation is given to the tetraquark systems $sc\bar{s}\bar{c}$, $sb\bar{s}\bar{b}$, $cb\bar{c}\bar{b}$, $nc\bar{n}\bar{c}$ and $nb\bar{n}\bar{b}$, suggesting that the $Z_{c}(4200)$ is the tetraquark $nc\bar{n}\bar{c}$ with $J^{PC}=1^{+-}$. All of these tetraquarks are above their lowest thresholds of two mesons and unstable against the strong decays.
|
2407.03586
|
Shile Chen
|
Shile Chen, Jiaxing Zhao and Pengfei Zhuang
|
Gluon decay into heavy quark pair under a strong magnetic field
| null | null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Due to the extreme large magnetic field produced in the initial stage of
non-central heavy-ion collision, the dynamical process of gluon decay into
heavy quark pair will take place under an external field rather than in vacuum.
Unlike in the vacuum case, where the process is forbidden by energy momentum
conservation, under the external field, a process emerges considering the
background energy which recovers the conservation. We calculate the gluon decay
rate at leading order under a uniform magnetic field.
|
[
{
"created": "Thu, 4 Jul 2024 02:35:48 GMT",
"version": "v1"
}
] |
2024-07-08
|
[
[
"Chen",
"Shile",
""
],
[
"Zhao",
"Jiaxing",
""
],
[
"Zhuang",
"Pengfei",
""
]
] |
Due to the extreme large magnetic field produced in the initial stage of non-central heavy-ion collision, the dynamical process of gluon decay into heavy quark pair will take place under an external field rather than in vacuum. Unlike in the vacuum case, where the process is forbidden by energy momentum conservation, under the external field, a process emerges considering the background energy which recovers the conservation. We calculate the gluon decay rate at leading order under a uniform magnetic field.
|
1810.04580
|
Tord Riemann
|
Johann Usovitsch and Ievgen Dubovyk and Tord Riemann
|
MBnumerics: Numerical integration of Mellin-Barnes integrals in physical
regions
|
10 pages, contribution to the proceedings of the conference "Loops
and Legs in Gauge Theories 2018 (LL2018)", accepted for publication on 16
August 2018
|
PoS(LL2018)046
| null |
DESY 18-121, KW 18-008
|
hep-ph
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
We introduce techniques to treat numerically Mellin-Barnes integrals in
physical regions, which arise in the need of the computation of Feynman
integrals for the electroweak two-loop corrections to the pseudo observables at
the Z-boson resonance.
|
[
{
"created": "Wed, 10 Oct 2018 15:18:16 GMT",
"version": "v1"
}
] |
2018-10-11
|
[
[
"Usovitsch",
"Johann",
""
],
[
"Dubovyk",
"Ievgen",
""
],
[
"Riemann",
"Tord",
""
]
] |
We introduce techniques to treat numerically Mellin-Barnes integrals in physical regions, which arise in the need of the computation of Feynman integrals for the electroweak two-loop corrections to the pseudo observables at the Z-boson resonance.
|
1005.3946
|
A. Tawfik
|
A. Tawfik (Egyptian Ctr. Theor. Phys., Cairo) and M. Wahba (Egyptian
Ctr. Theor. Phys., Cairo)
|
Bulk and Shear Viscosity in Hagedorn Fluid
|
6 Pages, 5 figures with 5 eps graphs
|
Annalen Phys.522:849-856,2010
|
10.1002/andp.201000056
|
ECTP-2010-02
|
hep-ph hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Assuming that the Hagedorn fluid composed of known particles and resonances
with masses $m<2\,$GeV obeys the {\it first-order} theory (Eckart) of
relativistic fluid, we discuss the transport properties of QCD confined phase.
Based on the relativistic kinetic theory formulated under the relaxation time
approximation, expressions for bulk and shear viscosity in thermal medium are
derived. The relaxation time in the Hagedorn dynamical fluid exclusively takes
into account the decay and eventually van der Waals processes. We comment on
the {\it in-medium} thermal effects on bulk and shear viscosities and averaged
relaxation time with and without the excluded-volume approach. As an
application of these results, we suggest the dynamics of heavy-ion collisions,
non-equlibrium thermodynamics and the cosmological models, which require thermo
and hydrodynamics equations of state.
|
[
{
"created": "Fri, 21 May 2010 12:26:37 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Sep 2010 14:08:52 GMT",
"version": "v2"
}
] |
2010-11-24
|
[
[
"Tawfik",
"A.",
"",
"Egyptian Ctr. Theor. Phys., Cairo"
],
[
"Wahba",
"M.",
"",
"Egyptian\n Ctr. Theor. Phys., Cairo"
]
] |
Assuming that the Hagedorn fluid composed of known particles and resonances with masses $m<2\,$GeV obeys the {\it first-order} theory (Eckart) of relativistic fluid, we discuss the transport properties of QCD confined phase. Based on the relativistic kinetic theory formulated under the relaxation time approximation, expressions for bulk and shear viscosity in thermal medium are derived. The relaxation time in the Hagedorn dynamical fluid exclusively takes into account the decay and eventually van der Waals processes. We comment on the {\it in-medium} thermal effects on bulk and shear viscosities and averaged relaxation time with and without the excluded-volume approach. As an application of these results, we suggest the dynamics of heavy-ion collisions, non-equlibrium thermodynamics and the cosmological models, which require thermo and hydrodynamics equations of state.
|
0802.2593
|
Masanori Hirai
|
M. Hirai, S. Kumano, M. Oka, and K. Sudoh
|
Determination of f_0(980) Structure by Fragmentation Functions
|
4page, 2eps figures, To appear in the proceedings of Chiral Symmetry
in Hadron and Nuclear Physics (Chiral 07), Osaka, Japan, 13-16 Nov. 2007
|
Mod.Phys.Lett.A23:2226-2229,2008
|
10.1142/S0217732308029071
|
KEK-TH-1225
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss internal structure of an exotic hadron by using fragmentation
functions. The fragmentation functions for the f_0(980) meson are obtained by a
global analysis of e^++e^- \to f_0+X data. Quark configuration of the f_0(980)
could be determined by peak positions and second moments of the obtained
fragmentation functions.
|
[
{
"created": "Tue, 19 Feb 2008 06:09:16 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Hirai",
"M.",
""
],
[
"Kumano",
"S.",
""
],
[
"Oka",
"M.",
""
],
[
"Sudoh",
"K.",
""
]
] |
We discuss internal structure of an exotic hadron by using fragmentation functions. The fragmentation functions for the f_0(980) meson are obtained by a global analysis of e^++e^- \to f_0+X data. Quark configuration of the f_0(980) could be determined by peak positions and second moments of the obtained fragmentation functions.
|
hep-ph/0209076
| null |
Thomas G. Rizzo
|
Effects of Radion Mixing on the Standard Model Higgs Boson
|
Latex. 7 pages, 5 figs; talk given at the International Workshop on
Linear Colliders, Jeju Island, Korea, 26-30 August 2002
| null | null |
SLAC-PUB-9492
|
hep-ph
| null |
We discuss how mixing between the Standard Model Higgs boson and the radion
of the Randall-Sundrum model can lead to significant shifts in the expected
properties of the Higgs boson. In particular we show that the total and partial
decay widths of the Higgs, as well as the $h\to gg$ branching fraction, can be
substantially altered from their SM expectations, while the remaining branching
fractions are modified less than about 5% for most of the parameter space
volume. Precision measurements of Higgs boson properties at at a Linear
Collider are shown to probe a large region of the Randall-Sundrum model
parameter space.
|
[
{
"created": "Fri, 6 Sep 2002 18:25:44 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Rizzo",
"Thomas G.",
""
]
] |
We discuss how mixing between the Standard Model Higgs boson and the radion of the Randall-Sundrum model can lead to significant shifts in the expected properties of the Higgs boson. In particular we show that the total and partial decay widths of the Higgs, as well as the $h\to gg$ branching fraction, can be substantially altered from their SM expectations, while the remaining branching fractions are modified less than about 5% for most of the parameter space volume. Precision measurements of Higgs boson properties at at a Linear Collider are shown to probe a large region of the Randall-Sundrum model parameter space.
|
0907.1319
|
Ralf Lehnert
|
Ralf Lehnert
|
CPT and Lorentz violation as signatures for Planck-scale physics
|
6 pages
|
J.Phys.Conf.Ser.171:012036,2009
|
10.1088/1742-6596/171/1/012036
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In recent years, the breakdown of spacetime symmetries has been identified as
a promising research field in the context of Planck-scale phenomenology. For
example, various theoretical approaches to the quantum-gravity problem are
known to accommodate minute violations of CPT invariance. This talk covers
various topics within this research area. In particular, some mechanisms for
spacetime-symmetry breaking as well as the Standard-Model Extension (SME) test
framework will be reviewed; the connection between CPT and Lorentz invariance
in quantum field theory will be exposed; and various experimental CPT tests
with emphasis on matter--antimatter comparisons will be discussed.
|
[
{
"created": "Wed, 8 Jul 2009 00:33:10 GMT",
"version": "v1"
}
] |
2009-10-08
|
[
[
"Lehnert",
"Ralf",
""
]
] |
In recent years, the breakdown of spacetime symmetries has been identified as a promising research field in the context of Planck-scale phenomenology. For example, various theoretical approaches to the quantum-gravity problem are known to accommodate minute violations of CPT invariance. This talk covers various topics within this research area. In particular, some mechanisms for spacetime-symmetry breaking as well as the Standard-Model Extension (SME) test framework will be reviewed; the connection between CPT and Lorentz invariance in quantum field theory will be exposed; and various experimental CPT tests with emphasis on matter--antimatter comparisons will be discussed.
|
1905.03771
|
Goutam Das
|
Ajjath A H, Amlan Chakraborty, Goutam Das, Pooja Mukherjee and V.
Ravindran
|
Resummed prediction for Higgs boson production through $b\bar{b}$
annihilation at N$^3$LL
|
19 pages, 4 figures, 2 tables
|
JHEP 1911 (2019) 006
|
10.1007/JHEP11(2019)006
|
IMSC/2019/05/04, DESY 19-076
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We present an accurate theoretical prediction for the production of Higgs
boson through bottom quark annihilation at the LHC up to
next-to-next-to-next-to leading order (N$^3$LO) plus
next-to-next-to-next-to-leading logarithmic (N$^3$LL) accuracy. We determine
the third order perturbative Quantum Chromodynamics (QCD) correction to the
process dependent constant in the resummed expression using the three loop
bottom quark form factor and third order quark soft distribution function.
Thanks to the recent computation of N$^3$LO corrections to this production
cross-section from all the partonic channels, an accurate matching can be
obtained for a consistent predictions at N$^3$LO+N$^3$LL accuracy in QCD. We
have studied in detail the impact of resummed threshold contributions to
inclusive cross-sections at various centre-of-mass energies and also discussed
their sensitivity to renormalization and factorization scales at
next-to-next-to leading order (NNLO) matched with next-to-next-to leading
logarithm (NNLL). At N$^3$LO+N$^3$LL, we predict the cross-section for
different centre-of-mass energies using the recently available results in
\cite{Duhr:2019kwi} as well as study the renormalization scale dependence at
the same order.
|
[
{
"created": "Thu, 9 May 2019 17:54:35 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Dec 2019 00:09:13 GMT",
"version": "v2"
}
] |
2019-12-30
|
[
[
"H",
"Ajjath A",
""
],
[
"Chakraborty",
"Amlan",
""
],
[
"Das",
"Goutam",
""
],
[
"Mukherjee",
"Pooja",
""
],
[
"Ravindran",
"V.",
""
]
] |
We present an accurate theoretical prediction for the production of Higgs boson through bottom quark annihilation at the LHC up to next-to-next-to-next-to leading order (N$^3$LO) plus next-to-next-to-next-to-leading logarithmic (N$^3$LL) accuracy. We determine the third order perturbative Quantum Chromodynamics (QCD) correction to the process dependent constant in the resummed expression using the three loop bottom quark form factor and third order quark soft distribution function. Thanks to the recent computation of N$^3$LO corrections to this production cross-section from all the partonic channels, an accurate matching can be obtained for a consistent predictions at N$^3$LO+N$^3$LL accuracy in QCD. We have studied in detail the impact of resummed threshold contributions to inclusive cross-sections at various centre-of-mass energies and also discussed their sensitivity to renormalization and factorization scales at next-to-next-to leading order (NNLO) matched with next-to-next-to leading logarithm (NNLL). At N$^3$LO+N$^3$LL, we predict the cross-section for different centre-of-mass energies using the recently available results in \cite{Duhr:2019kwi} as well as study the renormalization scale dependence at the same order.
|
1712.02373
|
Farinaldo Queiroz
|
Giorgio Arcadi, C. P. Ferreira, Florian Goertz, M. M. Guzzo, Farinaldo
S. Queiroz, A.C.O. Santos
|
Lepton Flavor Violation Induced by Dark Matter
|
11 pages, 5 figures
|
Phys. Rev. D 97, 075022 (2018)
|
10.1103/PhysRevD.97.075022
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Guided by gauge principles we discuss a predictive and falsifiable UV
complete model where the Dirac fermion that accounts for the cold dark matter
abundance in our universe induces the lepton flavor violation (LFV) decays $\mu
\rightarrow e\gamma$ and $\mu \rightarrow e e e$ as well as $\mu-e$ conversion.
We explore the interplay between direct dark matter detection, relic density,
collider probes and lepton flavor violation to conclusively show that one may
have a viable dark matter candidate yielding flavor violation signatures
expected to be fully probed in the upcoming of experiments. Interestingly,
keeping the dark matter mass not far from the TeV, our model has an approximate
prediction for the maximum LFV signal one could have while reproducing the
correct dark matter relic density.
|
[
{
"created": "Wed, 6 Dec 2017 19:07:20 GMT",
"version": "v1"
}
] |
2018-04-25
|
[
[
"Arcadi",
"Giorgio",
""
],
[
"Ferreira",
"C. P.",
""
],
[
"Goertz",
"Florian",
""
],
[
"Guzzo",
"M. M.",
""
],
[
"Queiroz",
"Farinaldo S.",
""
],
[
"Santos",
"A. C. O.",
""
]
] |
Guided by gauge principles we discuss a predictive and falsifiable UV complete model where the Dirac fermion that accounts for the cold dark matter abundance in our universe induces the lepton flavor violation (LFV) decays $\mu \rightarrow e\gamma$ and $\mu \rightarrow e e e$ as well as $\mu-e$ conversion. We explore the interplay between direct dark matter detection, relic density, collider probes and lepton flavor violation to conclusively show that one may have a viable dark matter candidate yielding flavor violation signatures expected to be fully probed in the upcoming of experiments. Interestingly, keeping the dark matter mass not far from the TeV, our model has an approximate prediction for the maximum LFV signal one could have while reproducing the correct dark matter relic density.
|
2111.06619
|
Tomona Kinugawa
|
Tomona Kinugawa and Tetsuo Hyodo
|
Range correction in the weak-binding relation for unstable states
|
5 pages, 2 figures, Proceedings of Particles and Nuclei International
Conference (PANIC2021), 5-10 September 2021
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The compositeness is defined as the weight of the hadronic molecule in the
hadron wave function. We can determine the internal structure of the
weak-binding system without any specific models from the compositeness. In
order to estimate the compositeness of the system with a large effective range,
we introduce the range correction to Weinberg's weak-binding relation by
modifying the correction terms. We study the applicability of the weak-binding
relations by the numerical calculation and show that the improved relation can
be applied to a larger parameter region compared with the previous one.
|
[
{
"created": "Fri, 12 Nov 2021 09:15:07 GMT",
"version": "v1"
}
] |
2021-11-15
|
[
[
"Kinugawa",
"Tomona",
""
],
[
"Hyodo",
"Tetsuo",
""
]
] |
The compositeness is defined as the weight of the hadronic molecule in the hadron wave function. We can determine the internal structure of the weak-binding system without any specific models from the compositeness. In order to estimate the compositeness of the system with a large effective range, we introduce the range correction to Weinberg's weak-binding relation by modifying the correction terms. We study the applicability of the weak-binding relations by the numerical calculation and show that the improved relation can be applied to a larger parameter region compared with the previous one.
|
1403.1179
|
Fabian Rennecke
|
Jan M. Pawlowski and Fabian Rennecke
|
Higher order quark-mesonic scattering processes and the phase structure
of QCD
|
20 pages, 14 figures. v2: journal version
| null |
10.1103/PhysRevD.90.076002
| null |
hep-ph hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the impact of higher order quark-meson scattering processes on the
chiral phase structure of two-flavour QCD at finite temperature and quark
density. Thermal, density and quantum fluctuations are included within a
functional renormalisation group approach to the quark-meson model. We present
results on the chiral phase boundary, the critical endpoint, and the curvature
of the phase transition line at vanishing density.
|
[
{
"created": "Wed, 5 Mar 2014 16:23:49 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Sep 2017 15:40:18 GMT",
"version": "v2"
}
] |
2017-09-27
|
[
[
"Pawlowski",
"Jan M.",
""
],
[
"Rennecke",
"Fabian",
""
]
] |
We study the impact of higher order quark-meson scattering processes on the chiral phase structure of two-flavour QCD at finite temperature and quark density. Thermal, density and quantum fluctuations are included within a functional renormalisation group approach to the quark-meson model. We present results on the chiral phase boundary, the critical endpoint, and the curvature of the phase transition line at vanishing density.
|
hep-ph/9807223
|
Melikhov
|
M. Beyer and D. Melikhov
|
Form factors of exclusive $b\to u$ transitions
|
revtex, 6 pages, 1 figure
|
Phys.Lett.B436:344-350,1998
|
10.1016/S0370-2693(98)00847-8
| null |
hep-ph
| null |
We present the form factors of the $B\to\pi,\rho$ transitions induced by the
$b\to u$ quark currents at all kinematically accessible $q^2$. Our analysis is
based on the spectral representations of the form factors within the
constituent quark picture: we fix the soft meson wave functions and the
constituent quark masses by fitting $A_1(q^2)$ and $T_2(q^2)$ to the lattice
results at small recoils ($17\lesssim q^2\lesssim 20 GeV^2$). We then calculate
the $B\to\pi,\rho$ transition form factors down to $q^2=0$. For the $B\to\pi$
case the region $q^2\lesssim 20 GeV^2$ however does not cover the whole
kinematically accessible range. Due to the smallness of the pion mass the
region of small recoils is close to the nearby $B^*(5234)$ resonance. We
develop a parametrization which includes the $B^*$ dominance of the form
factors $f_+$ and $f_-$ at small recoils and numerically reproduces the results
of calculations at $q^2\lesssim 20 GeV^2$. We find
$\Gamma(B\to\pi\ell\nu)=8.0^{+0.8}_{-0.2} |V_{ub}|^2 $ps$^{-1}$ and
$\Gamma(B\to\rho\ell\nu)=15.8\pm 2.3 |V_{ub}|^2 $ps$^{-1}$.
|
[
{
"created": "Thu, 2 Jul 1998 14:16:17 GMT",
"version": "v1"
}
] |
2011-07-19
|
[
[
"Beyer",
"M.",
""
],
[
"Melikhov",
"D.",
""
]
] |
We present the form factors of the $B\to\pi,\rho$ transitions induced by the $b\to u$ quark currents at all kinematically accessible $q^2$. Our analysis is based on the spectral representations of the form factors within the constituent quark picture: we fix the soft meson wave functions and the constituent quark masses by fitting $A_1(q^2)$ and $T_2(q^2)$ to the lattice results at small recoils ($17\lesssim q^2\lesssim 20 GeV^2$). We then calculate the $B\to\pi,\rho$ transition form factors down to $q^2=0$. For the $B\to\pi$ case the region $q^2\lesssim 20 GeV^2$ however does not cover the whole kinematically accessible range. Due to the smallness of the pion mass the region of small recoils is close to the nearby $B^*(5234)$ resonance. We develop a parametrization which includes the $B^*$ dominance of the form factors $f_+$ and $f_-$ at small recoils and numerically reproduces the results of calculations at $q^2\lesssim 20 GeV^2$. We find $\Gamma(B\to\pi\ell\nu)=8.0^{+0.8}_{-0.2} |V_{ub}|^2 $ps$^{-1}$ and $\Gamma(B\to\rho\ell\nu)=15.8\pm 2.3 |V_{ub}|^2 $ps$^{-1}$.
|
hep-ph/0701067
|
Ruben Flores
|
Ruben Flores-Mendieta, Alfonso Martinez
|
Baryon semileptonic decays: the Mexican contribution
|
10 pages. Prepared for the Commemorative Volume of the Divison of
Particles and Fields of the Mexican Physical Society
|
AIP Conf.Proc.857B:27-36,2006
|
10.1063/1.2359389
| null |
hep-ph
| null |
We give a detailed account of the techniques to compute radiative corrections
in baryon semileptonic decays developed over the years by Mexican
collaborations. We explain how the method works by obtaining an expression for
the Dalitz plot of semileptonic decays of polarized baryons including radiative
corrections to order ${\mathcal O}(\alpha q/\pi M_1)$, where $q$ is the
four-momentum transfer and $M_1$ is the mass of the decaying baryon. From here
we compute the totally integrated spin angular asymmetry coefficient of the
emitted baryon and compare its value with other results.
|
[
{
"created": "Tue, 9 Jan 2007 18:23:32 GMT",
"version": "v1"
}
] |
2010-12-13
|
[
[
"Flores-Mendieta",
"Ruben",
""
],
[
"Martinez",
"Alfonso",
""
]
] |
We give a detailed account of the techniques to compute radiative corrections in baryon semileptonic decays developed over the years by Mexican collaborations. We explain how the method works by obtaining an expression for the Dalitz plot of semileptonic decays of polarized baryons including radiative corrections to order ${\mathcal O}(\alpha q/\pi M_1)$, where $q$ is the four-momentum transfer and $M_1$ is the mass of the decaying baryon. From here we compute the totally integrated spin angular asymmetry coefficient of the emitted baryon and compare its value with other results.
|
hep-ph/9710465
|
Martin Stock
|
R.L. Jaffe
|
Can Transversity Be Measured?
|
15 pages, 5 postscript figures, LaTeX & BoxedEPS; invited paper,
presented at the 2nd Topical Workshop, DESY Zeuthen, September 1-5, 1997:
"Deep Inelastic Scattering off Polarized Targets: Theory Meets Experiment";
email to jaffe@mitlns.mit.edu ; name of conference and proceedings added
| null | null |
MIT-CTP-2685
|
hep-ph nucl-th
| null |
I review the ways that have been proposed to measure the quark transversity
distribution in the nucleon. I then explain a proposal, developed by Xuemin
Jin, Jian Tang and myself, to measure transversity through the final state
interaction between two mesons ($\pi\pi$, $K \bar K$, or $\pi K$) produced in
the current fragmentation region in deep inelastic scattering on a transversely
polarized nucleon.
|
[
{
"created": "Fri, 24 Oct 1997 20:05:07 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Oct 1997 17:36:34 GMT",
"version": "v2"
}
] |
2009-09-25
|
[
[
"Jaffe",
"R. L.",
""
]
] |
I review the ways that have been proposed to measure the quark transversity distribution in the nucleon. I then explain a proposal, developed by Xuemin Jin, Jian Tang and myself, to measure transversity through the final state interaction between two mesons ($\pi\pi$, $K \bar K$, or $\pi K$) produced in the current fragmentation region in deep inelastic scattering on a transversely polarized nucleon.
|
1005.1077
|
Christian Flacco
|
Christian J. Flacco, Daniel Whiteson, Tim M.P. Tait, Shaouly
Bar-Shalom
|
Direct Mass Limits for Chiral Fourth-Generation Quarks in All Mixing
Scenarios
| null |
Phys.Rev.Lett.105:111801,2010
|
10.1103/PhysRevLett.105.111801
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Present limits on chiral fourth-generation quark masses $m_{b'}$ and $m_{t'}$
are broadly generalized and strengthened by combining both $t'$ and $b'$ decays
and considering the full range of $t'$ and $b'$ flavor-mixing scenarios (with
the lighter generations). Various characteristic mass-splitting choices are
considered. With $m_{t'} > m_{b'}$ we find that CDF limits on the $b'$ mass
vary by no more than 10-20% with any choice of flavor-mixing, while for the
$t'$ mass, we typically find stronger bounds, in some cases up to $m_{t'} >
430$ GeV. For $m_{b'} > m_{t'}$ we find $m_{b'} > 380 - 430$ GeV, depending on
the flavor-mixing and the size of the $m_{t'} - m_{b'}$ mass splitting.
|
[
{
"created": "Thu, 6 May 2010 20:12:32 GMT",
"version": "v1"
}
] |
2014-11-21
|
[
[
"Flacco",
"Christian J.",
""
],
[
"Whiteson",
"Daniel",
""
],
[
"Tait",
"Tim M. P.",
""
],
[
"Bar-Shalom",
"Shaouly",
""
]
] |
Present limits on chiral fourth-generation quark masses $m_{b'}$ and $m_{t'}$ are broadly generalized and strengthened by combining both $t'$ and $b'$ decays and considering the full range of $t'$ and $b'$ flavor-mixing scenarios (with the lighter generations). Various characteristic mass-splitting choices are considered. With $m_{t'} > m_{b'}$ we find that CDF limits on the $b'$ mass vary by no more than 10-20% with any choice of flavor-mixing, while for the $t'$ mass, we typically find stronger bounds, in some cases up to $m_{t'} > 430$ GeV. For $m_{b'} > m_{t'}$ we find $m_{b'} > 380 - 430$ GeV, depending on the flavor-mixing and the size of the $m_{t'} - m_{b'}$ mass splitting.
|
1706.05071
|
David Latimer
|
David C. Latimer
|
Two-photon interactions with Majorana fermions
| null |
Phys. Rev. D 94, 093010 (2016)
|
10.1103/PhysRevD.94.093010
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Because Majorana fermions are their own antiparticles, their electric and
magnetic dipole moments must vanish, leaving the anapole moment as their only
static electromagnetic property. But the existence of induced dipole moments is
not necessarily prohibited. Through a study real Compton scattering, we explore
the constraints that the Majorana fermion's self-conjugate nature has on
induced moments. In terms of the Compton amplitude, we find no constraints if
the interactions are separately invariant under charge conjugation, parity, and
time reversal. However, if the interactions are odd under parity and even under
time reversal, then these contributions to the Compton amplitude must vanish.
We employ a simple model to confirm these general findings via explicit
calculation of the Majorana fermion's polarizabilities. We then use these
polarizabilities to estimate the cross-section for $s$-wave annihilation of two
Majorana fermions into photons. The cross-section is larger than a na\"ive
estimate might suggest.
|
[
{
"created": "Thu, 15 Jun 2017 20:31:35 GMT",
"version": "v1"
}
] |
2017-06-19
|
[
[
"Latimer",
"David C.",
""
]
] |
Because Majorana fermions are their own antiparticles, their electric and magnetic dipole moments must vanish, leaving the anapole moment as their only static electromagnetic property. But the existence of induced dipole moments is not necessarily prohibited. Through a study real Compton scattering, we explore the constraints that the Majorana fermion's self-conjugate nature has on induced moments. In terms of the Compton amplitude, we find no constraints if the interactions are separately invariant under charge conjugation, parity, and time reversal. However, if the interactions are odd under parity and even under time reversal, then these contributions to the Compton amplitude must vanish. We employ a simple model to confirm these general findings via explicit calculation of the Majorana fermion's polarizabilities. We then use these polarizabilities to estimate the cross-section for $s$-wave annihilation of two Majorana fermions into photons. The cross-section is larger than a na\"ive estimate might suggest.
|
1907.10071
|
Debasish Borah
|
Basabendu Barman, Debasish Borah, Purusottam Ghosh, Abhijit Kumar Saha
|
Flavoured gauge extension of singlet-doublet fermionic dark matter:
neutrino mass, high scale validity and collider signatures
|
56 pages, 20 figures, matches version accepted for publication in
JHEP
| null |
10.1007/JHEP10(2019)275
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose an Abelian gauged version of the singlet-doublet fermionic dark
matter (DM) model where DM, combination of a vector like fermion doublet and a
fermion singlet, is naturally stabilised by the gauge symmetry without
requiring any ad-hoc discrete symmetries. In order to have good detection
prospects at collider experiments like the large hadron collider (LHC) and
enlarged parameter space for low mass DM, we consider the additional gauge
symmetry to be based on the quantum $B-3L_{\tau}$ where the restriction to
third generation of leptons is chosen to have weaker bounds from the LHC on the
corresponding gauge boson. The triangle anomalies arising in this model can be
cancelled by including a right handed neutrino which takes part in generating
light neutrino masses through type I seesaw mechanism. Apart from DM, collider
prospects and light neutrino masses, the model also offers high scale validity
giving rise to a stable electroweak vacuum and perturbative couplings all the
way up to the Planck scale. We constrain our model parameters from these
requirements as well as existing relevant constraints related to DM and
colliders.
|
[
{
"created": "Tue, 23 Jul 2019 18:00:03 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Oct 2019 13:43:12 GMT",
"version": "v2"
}
] |
2020-01-08
|
[
[
"Barman",
"Basabendu",
""
],
[
"Borah",
"Debasish",
""
],
[
"Ghosh",
"Purusottam",
""
],
[
"Saha",
"Abhijit Kumar",
""
]
] |
We propose an Abelian gauged version of the singlet-doublet fermionic dark matter (DM) model where DM, combination of a vector like fermion doublet and a fermion singlet, is naturally stabilised by the gauge symmetry without requiring any ad-hoc discrete symmetries. In order to have good detection prospects at collider experiments like the large hadron collider (LHC) and enlarged parameter space for low mass DM, we consider the additional gauge symmetry to be based on the quantum $B-3L_{\tau}$ where the restriction to third generation of leptons is chosen to have weaker bounds from the LHC on the corresponding gauge boson. The triangle anomalies arising in this model can be cancelled by including a right handed neutrino which takes part in generating light neutrino masses through type I seesaw mechanism. Apart from DM, collider prospects and light neutrino masses, the model also offers high scale validity giving rise to a stable electroweak vacuum and perturbative couplings all the way up to the Planck scale. We constrain our model parameters from these requirements as well as existing relevant constraints related to DM and colliders.
|
hep-ph/9707279
|
Chi-Sing Lam
|
C.S. Lam (McGill University)
|
Exponentiation of the Sum of Nonabelian Amplitudes
| null | null | null | null |
hep-ph
| null |
This paper contains an implicit assumption that the summand in eq. (4.2) for
different $n$'s commute. This paper should be replaced by hep-th/9804181 where
this assumption is removedand the result generalized.
|
[
{
"created": "Tue, 8 Jul 1997 17:02:18 GMT",
"version": "v1"
},
{
"created": "Sun, 3 May 1998 18:04:21 GMT",
"version": "v2"
}
] |
2008-02-03
|
[
[
"Lam",
"C. S.",
"",
"McGill University"
]
] |
This paper contains an implicit assumption that the summand in eq. (4.2) for different $n$'s commute. This paper should be replaced by hep-th/9804181 where this assumption is removedand the result generalized.
|
hep-ph/9512382
|
Hans Weber
|
H.J. Weber, Xiaoming Xu (University of Virginia)
|
Dependence of Electromagnetic Form Factors of Hadrons on Light Cone
Frames
|
22 pages, Latex, run twice and type r enter after ? Nucl.Phys.A
|
Nucl.Phys. A600 (1996) 461-476
|
10.1016/0375-9474(95)00503-X
| null |
hep-ph
| null |
A constituent quark model is developed for an arbitrary light- cone direction
\omega. Form factors are obtained from free one-body electromagnetic current
matrix elements. They are found to be \omega- independent for spin-0 mesons,
the nucleon and \Lambda hyperon, while there is \omega-dependence for spin-1
systems like the deuteron.
|
[
{
"created": "Wed, 20 Dec 1995 22:08:00 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Weber",
"H. J.",
"",
"University of Virginia"
],
[
"Xu",
"Xiaoming",
"",
"University of Virginia"
]
] |
A constituent quark model is developed for an arbitrary light- cone direction \omega. Form factors are obtained from free one-body electromagnetic current matrix elements. They are found to be \omega- independent for spin-0 mesons, the nucleon and \Lambda hyperon, while there is \omega-dependence for spin-1 systems like the deuteron.
|
1712.09919
|
Keith R. Dienes
|
Keith R. Dienes, Jacob Fennick, Jason Kumar, Brooks Thomas
|
Dynamical Dark Matter from Thermal Freeze-Out
|
19 pages, LaTeX, 6 figures, 2 tables
|
Phys. Rev. D 97, 063522 (2018)
|
10.1103/PhysRevD.97.063522
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the Dynamical Dark Matter (DDM) framework, the dark sector comprises a
large number of constituent dark particles whose individual masses, lifetimes,
and cosmological abundances obey specific scaling relations with respect to
each other. In particular, the most natural versions of this framework tend to
require a spectrum of cosmological abundances which scale inversely with mass,
so that dark-sector states with larger masses have smaller abundances. Thus
far, DDM model-building has primarily relied on non-thermal mechanisms for
abundance generation such as misalignment production, since these mechanisms
give rise to abundances that have this property. By contrast, the simplest
versions of thermal freeze-out tend to produce abundances that increase, rather
than decrease, with the mass of the dark-matter component. In this paper, we
demonstrate that there exist relatively simple modifications of the traditional
thermal freeze-out mechanism which "flip" the resulting abundance spectrum,
producing abundances that scale inversely with mass. Moreover, we demonstrate
that a far broader variety of scaling relations between lifetimes, abundances,
and masses can emerge through thermal freeze-out than through the non-thermal
mechanisms previously considered for DDM ensembles. The results of this paper
thus extend the DDM framework into the thermal domain and essentially allow us
to "design" our resulting DDM ensembles at will in order to realize a rich
array of resulting dark-matter phenomenologies.
|
[
{
"created": "Thu, 28 Dec 2017 16:36:11 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Mar 2018 14:33:24 GMT",
"version": "v2"
}
] |
2018-03-28
|
[
[
"Dienes",
"Keith R.",
""
],
[
"Fennick",
"Jacob",
""
],
[
"Kumar",
"Jason",
""
],
[
"Thomas",
"Brooks",
""
]
] |
In the Dynamical Dark Matter (DDM) framework, the dark sector comprises a large number of constituent dark particles whose individual masses, lifetimes, and cosmological abundances obey specific scaling relations with respect to each other. In particular, the most natural versions of this framework tend to require a spectrum of cosmological abundances which scale inversely with mass, so that dark-sector states with larger masses have smaller abundances. Thus far, DDM model-building has primarily relied on non-thermal mechanisms for abundance generation such as misalignment production, since these mechanisms give rise to abundances that have this property. By contrast, the simplest versions of thermal freeze-out tend to produce abundances that increase, rather than decrease, with the mass of the dark-matter component. In this paper, we demonstrate that there exist relatively simple modifications of the traditional thermal freeze-out mechanism which "flip" the resulting abundance spectrum, producing abundances that scale inversely with mass. Moreover, we demonstrate that a far broader variety of scaling relations between lifetimes, abundances, and masses can emerge through thermal freeze-out than through the non-thermal mechanisms previously considered for DDM ensembles. The results of this paper thus extend the DDM framework into the thermal domain and essentially allow us to "design" our resulting DDM ensembles at will in order to realize a rich array of resulting dark-matter phenomenologies.
|
1606.01492
|
Qiaoli Yang
|
Qiaoli Yang, Haoran Di
|
Vector Dark Matter Detection using the Quantum Jump of Atoms
|
5 pages, 3 figures; references added; matches version published in
PLB
|
Phys. Lett. B 780 (2018) 622
|
10.1016/j.physletb.2018.03.045
| null |
hep-ph astro-ph.CO hep-ex physics.atom-ph physics.ins-det
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The hidden sector U(1) vector bosons created from inflationary fluctuations
can be a substantial fraction of dark matter if their mass is around
$10^{-5}$eV. The creation mechanism makes the vector bosons' energy spectral
density $\rho_{cdm}/\Delta E$ very high. Therefore, the dark electric dipole
transition rate in atoms is boosted if the energy gap between atomic states
equals the mass of the vector bosons. By using the Zeeman effect, the energy
gap between the 2S state and the 2P state in hydrogen atoms or hydrogen like
ions can be tuned. The $2S$ state can be populated with electrons due to its
relatively long life, which is about $1/7$s. When the energy gap between the
semi-ground $2S$ state and the 2P state matches the mass of the cosmic vector
bosons, induced transitions occur and the 2P state subsequently decays into the
1S state. The $2P\to1S$ decay emitted Lyman-$\alpha$ photons can then be
registered. The choices of target atoms depend on the experimental facilities
and the mass ranges of the vector bosons. Because the mass of the vector boson
is connected to the inflation scale, the proposed experiment may provide a
probe to inflation.
|
[
{
"created": "Sun, 5 Jun 2016 11:16:58 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jun 2016 08:45:39 GMT",
"version": "v2"
},
{
"created": "Sun, 26 Jun 2016 04:15:30 GMT",
"version": "v3"
},
{
"created": "Thu, 12 Oct 2017 18:40:03 GMT",
"version": "v4"
},
{
"created": "Thu, 5 Apr 2018 09:56:12 GMT",
"version": "v5"
}
] |
2018-08-27
|
[
[
"Yang",
"Qiaoli",
""
],
[
"Di",
"Haoran",
""
]
] |
The hidden sector U(1) vector bosons created from inflationary fluctuations can be a substantial fraction of dark matter if their mass is around $10^{-5}$eV. The creation mechanism makes the vector bosons' energy spectral density $\rho_{cdm}/\Delta E$ very high. Therefore, the dark electric dipole transition rate in atoms is boosted if the energy gap between atomic states equals the mass of the vector bosons. By using the Zeeman effect, the energy gap between the 2S state and the 2P state in hydrogen atoms or hydrogen like ions can be tuned. The $2S$ state can be populated with electrons due to its relatively long life, which is about $1/7$s. When the energy gap between the semi-ground $2S$ state and the 2P state matches the mass of the cosmic vector bosons, induced transitions occur and the 2P state subsequently decays into the 1S state. The $2P\to1S$ decay emitted Lyman-$\alpha$ photons can then be registered. The choices of target atoms depend on the experimental facilities and the mass ranges of the vector bosons. Because the mass of the vector boson is connected to the inflation scale, the proposed experiment may provide a probe to inflation.
|
hep-ph/9708490
|
Jan Kalinowski
|
Jan Kalinowski
|
Sleptons at LEP2 and Tevatron in R-Parity Violating SUSY
|
LaTeX file, 14 pages, 3 figures, uses epsfig, iopconf1. Presented at
"Beyond the Desert 97 -- Accelerator and Non-Accelerator Approaches",
Ringberg Castle, Germany, June 1997, to appear in the proceedings
| null | null |
DESY 97-145
|
hep-ph
| null |
In supersymmetric theories with R-parity breaking, sleptons could be produced
singly in $e^+e^-$ collisions at LEP2 and in $q\bar{q}$ annihilation at the
Tevatron through interactions in which two quark or two lepton fields are
coupled to a slepton field. At LEP they could manifest themselves in Bhabha
scattering, and in the annihilation to $\mu^+\mu^-$, \taus, and $q\bar{q}$
pairs. The formation of sneutrinos, $e^+e^-\ra \ti{\nu}$, and their signals for
a mass within the reach of this machine, is an exciting speculation which can
be investigated in the coming LEP2 runs with energies close to $\sqrt{s}=200$
GeV. At the Tevatron the sleptons can be searched for as resonances in
$p\bar{p}\to \tilde{\nu} \to \ell^+\ell^-$ and $\tilde{\ell}\to \ell\nu $ final
states. Existing LEP2 and Tevatron data can be exploited to derive bounds on
the Yukawa couplings of sleptons to quark and lepton pairs.
|
[
{
"created": "Fri, 29 Aug 1997 10:43:30 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kalinowski",
"Jan",
""
]
] |
In supersymmetric theories with R-parity breaking, sleptons could be produced singly in $e^+e^-$ collisions at LEP2 and in $q\bar{q}$ annihilation at the Tevatron through interactions in which two quark or two lepton fields are coupled to a slepton field. At LEP they could manifest themselves in Bhabha scattering, and in the annihilation to $\mu^+\mu^-$, \taus, and $q\bar{q}$ pairs. The formation of sneutrinos, $e^+e^-\ra \ti{\nu}$, and their signals for a mass within the reach of this machine, is an exciting speculation which can be investigated in the coming LEP2 runs with energies close to $\sqrt{s}=200$ GeV. At the Tevatron the sleptons can be searched for as resonances in $p\bar{p}\to \tilde{\nu} \to \ell^+\ell^-$ and $\tilde{\ell}\to \ell\nu $ final states. Existing LEP2 and Tevatron data can be exploited to derive bounds on the Yukawa couplings of sleptons to quark and lepton pairs.
|
2209.10233
|
Trisha Sarkar
|
Trisha Sarkar
|
Probing non-unitarity of neutrino mixing in the scenario of Lorentz
violation and dark nonstandard interaction
|
11 pages, 16 figures
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Neutrino flavour oscillation is one of the primary indication of the
existence of new physics beyond standard model. The presence of small neutrino
mass is indispensable to explicate the oscillation among different flavours of
neutrino. By the addition of a right handed neutral lepton with the standard
model fermions, it is possible to generate tiny neutrino mass. Such additional
fermion may induce non-unitarity to the $3\times 3$ PMNS mixing matrix which
influences the propagation of neutrino in space-time. In this work the effect
of non-unitary mixing matrix is analyzed in neutrino oscillation in presence of
two new physics scenarios, Lorentz violation and dark non-standard interaction.
Lorentz symmetry violation mainly appears at the Planck scale, which may also
be manifested at a lower energy level. On the other hand, dark non standard
interaction arises due to the interaction of neutrino with the environmental
dark matter which contributes as a perturbative correction to the neutrino
mass. In this analysis, the comparative study of unitary and non-unitary mixing
matrix is carried out considering the scenario of Lorentz violation and dark
NSI in the context of long baseline DUNE and short baseline Daya Bay
experimental set up. The signature of dark nonstandard interaction is
observable in both DUNE and Daya Bay set up in terms of large value of neutrino
survival and oscillation probability respectively and is a possible explanation
for the excess flux observed at $\sim5$ MeV in Daya Bay experiment. The
signature of Lorentz violation is also possible to be observed in the short
baseline Daya Bay experiment only.
|
[
{
"created": "Wed, 21 Sep 2022 09:58:08 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Sep 2022 16:26:42 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Jan 2023 11:56:54 GMT",
"version": "v3"
}
] |
2023-01-31
|
[
[
"Sarkar",
"Trisha",
""
]
] |
Neutrino flavour oscillation is one of the primary indication of the existence of new physics beyond standard model. The presence of small neutrino mass is indispensable to explicate the oscillation among different flavours of neutrino. By the addition of a right handed neutral lepton with the standard model fermions, it is possible to generate tiny neutrino mass. Such additional fermion may induce non-unitarity to the $3\times 3$ PMNS mixing matrix which influences the propagation of neutrino in space-time. In this work the effect of non-unitary mixing matrix is analyzed in neutrino oscillation in presence of two new physics scenarios, Lorentz violation and dark non-standard interaction. Lorentz symmetry violation mainly appears at the Planck scale, which may also be manifested at a lower energy level. On the other hand, dark non standard interaction arises due to the interaction of neutrino with the environmental dark matter which contributes as a perturbative correction to the neutrino mass. In this analysis, the comparative study of unitary and non-unitary mixing matrix is carried out considering the scenario of Lorentz violation and dark NSI in the context of long baseline DUNE and short baseline Daya Bay experimental set up. The signature of dark nonstandard interaction is observable in both DUNE and Daya Bay set up in terms of large value of neutrino survival and oscillation probability respectively and is a possible explanation for the excess flux observed at $\sim5$ MeV in Daya Bay experiment. The signature of Lorentz violation is also possible to be observed in the short baseline Daya Bay experiment only.
|
hep-ph/0511231
|
Stefano Forte
|
Riccardo Abbate and Stefano Forte
|
Re-evaluation of the Gottfried sum using neural networks
|
4 pages, 3 figures, latex with revtex
|
Phys.Rev. D72 (2005) 117503
|
10.1103/PhysRevD.72.117503
|
IFUM-855-FT
|
hep-ph
| null |
We provide a determination of the Gottfried sum from all available data,
based on a neural network parametrization of the nonsinglet structure function
F_2. We find S_G=0.244 +- 0.045, closer to the quark model expectation S_G=1/3
than previous results. We show that the uncertainty from the small x region is
somewhat underestimated in previous determinations.
|
[
{
"created": "Fri, 18 Nov 2005 16:24:52 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Abbate",
"Riccardo",
""
],
[
"Forte",
"Stefano",
""
]
] |
We provide a determination of the Gottfried sum from all available data, based on a neural network parametrization of the nonsinglet structure function F_2. We find S_G=0.244 +- 0.045, closer to the quark model expectation S_G=1/3 than previous results. We show that the uncertainty from the small x region is somewhat underestimated in previous determinations.
|
2308.01380
|
Marco Arroyo
|
M. A. Arroyo-Ure\~na, J. Lorenzo D\'iaz-Cruz, O. F\'elix-Beltr\'an and
M. Zeleny-Mora
|
Lessons from LHC on the LFV Higgs decays $h \to \ell_a \ell_b$ in the
Two-Higgs Doublet Models
|
Version accepted to be published in IJMPA
| null |
10.1142/S0217751X24500799
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The non-conservation of the lepton number has been explored at the LHC
through the Lepton-Flavor Violating (LFV) Higgs decays $h\to\ell_a\ell_b$, with
$\ell_{a,\,b}=e,\,\mu,\,\tau$ $(a \neq b)$. Current limits on these decays are
a source of valuable information on the structure of the Yukawa and Higgs
sectors. The LFV Higgs couplings can arise within the general Two-Higgs Doublet
Model (2HDM); the predicted rates for these decay modes depend on the specific
Yukawa structure being considered, ranging from a vanishing branching ratio at
tree-level for some versions (2HDM-I, II, X, Y), up to large and detectable
ratios within the general 2HDM-III. An attractive scenario is given by the
texturized version of the model (2HDM-Tx), with the Yukawa matrices having some
texture zeros, such as the minimal version with the so-called Cheng-Sher
ansazt. We study the constraints on the parameter space of the 2HDM provided by
experimental and theoretical restrictions, and use them to study the detection
of LFV Higgs modes at LHC. We find several encouraging scenarios to the search
for the decay $h \to\tau\mu$ that could be achieved in the High-Luminosity LHC.
On the other hand, LFV Higgs couplings can also be induced at one-loop level in
the 2HDM with neutrino masses, with the loops being mediated by neutrino
interactions; we find that the resulting branching ratios are of order
$10^{-7}$ at best, which is out of the reach of current and future phases of
the LHC.
|
[
{
"created": "Wed, 2 Aug 2023 18:37:21 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Jul 2024 23:28:19 GMT",
"version": "v2"
}
] |
2024-07-18
|
[
[
"Arroyo-Ureña",
"M. A.",
""
],
[
"Díaz-Cruz",
"J. Lorenzo",
""
],
[
"Félix-Beltrán",
"O.",
""
],
[
"Zeleny-Mora",
"M.",
""
]
] |
The non-conservation of the lepton number has been explored at the LHC through the Lepton-Flavor Violating (LFV) Higgs decays $h\to\ell_a\ell_b$, with $\ell_{a,\,b}=e,\,\mu,\,\tau$ $(a \neq b)$. Current limits on these decays are a source of valuable information on the structure of the Yukawa and Higgs sectors. The LFV Higgs couplings can arise within the general Two-Higgs Doublet Model (2HDM); the predicted rates for these decay modes depend on the specific Yukawa structure being considered, ranging from a vanishing branching ratio at tree-level for some versions (2HDM-I, II, X, Y), up to large and detectable ratios within the general 2HDM-III. An attractive scenario is given by the texturized version of the model (2HDM-Tx), with the Yukawa matrices having some texture zeros, such as the minimal version with the so-called Cheng-Sher ansazt. We study the constraints on the parameter space of the 2HDM provided by experimental and theoretical restrictions, and use them to study the detection of LFV Higgs modes at LHC. We find several encouraging scenarios to the search for the decay $h \to\tau\mu$ that could be achieved in the High-Luminosity LHC. On the other hand, LFV Higgs couplings can also be induced at one-loop level in the 2HDM with neutrino masses, with the loops being mediated by neutrino interactions; we find that the resulting branching ratios are of order $10^{-7}$ at best, which is out of the reach of current and future phases of the LHC.
|
hep-ph/0605317
|
Eef van Beveren
|
Eef van Beveren and George Rupp
|
Is the Y(4260) just a coupled-channel signal?
|
6 pages, 8 figures
| null | null | null |
hep-ph
| null |
The Ds-Ds*, D*-D*, and Ds*-Ds*, P-wave channels in the energy region of the
Y(4260) charmonium structure are studied in a coupled-channel model applied to
JPC=1-- c-cbar resonances. The three channels exhibit enhancements that peak at
4.27 GeV, 4.26 GeV, and 4.33 GeV, respectively, having widths ranging from 80
to 200 MeV. However, no S-matrix poles are found, other than those associated
with the psi(2D,4160) and psi(4S,4415). The conclusion is that the observed
Y(4260) signal(s) in pi-pi J/psi is (are) probably associated with the opening
of the aforementioned channels, resulting in a resonance-like structure caused
by the tail of the psi(3S,4040) resonance, roughly midway between the mentioned
P-wave thresholds and a sharp kinematical minimum at about 4.4 GeV present in
both the experimental and the model scattering amplitude.
|
[
{
"created": "Mon, 29 May 2006 15:46:52 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"van Beveren",
"Eef",
""
],
[
"Rupp",
"George",
""
]
] |
The Ds-Ds*, D*-D*, and Ds*-Ds*, P-wave channels in the energy region of the Y(4260) charmonium structure are studied in a coupled-channel model applied to JPC=1-- c-cbar resonances. The three channels exhibit enhancements that peak at 4.27 GeV, 4.26 GeV, and 4.33 GeV, respectively, having widths ranging from 80 to 200 MeV. However, no S-matrix poles are found, other than those associated with the psi(2D,4160) and psi(4S,4415). The conclusion is that the observed Y(4260) signal(s) in pi-pi J/psi is (are) probably associated with the opening of the aforementioned channels, resulting in a resonance-like structure caused by the tail of the psi(3S,4040) resonance, roughly midway between the mentioned P-wave thresholds and a sharp kinematical minimum at about 4.4 GeV present in both the experimental and the model scattering amplitude.
|
hep-ph/9402293
| null |
Hong-Jian He, Zhaoming Qiu, Chia-Hsiung Tze
|
Inconsistency of QED in the Presence of Dirac Monopoles
|
Extended and combined version, refinements added; 20 LaTex pages,
Published in Z. Phys. C65, pp.175-182
|
Z.Phys.C65:175-182,1995
|
10.1007/BF01571318
|
VPI-IHEP-93-12
|
hep-ph astro-ph hep-th nucl-th
| null |
A precise formulation of $U(1)$ local gauge invariance in QED is presented,
which clearly shows that the gauge coupling associated with the unphysical
longitudinal photon field is non-observable and actually has an arbitrary
value. We then re-examine the Dirac quantization condition and find that its
derivation involves solely the unphysical longitudinal coupling. Hence an
inconsistency inevitably arises in the presence of Dirac monopoles and this can
be considered as a theoretical evidence against their existence. An
alternative, independent proof of this conclusion is also presented.
|
[
{
"created": "Wed, 16 Feb 1994 04:52:16 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Dec 1994 03:22:10 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"He",
"Hong-Jian",
""
],
[
"Qiu",
"Zhaoming",
""
],
[
"Tze",
"Chia-Hsiung",
""
]
] |
A precise formulation of $U(1)$ local gauge invariance in QED is presented, which clearly shows that the gauge coupling associated with the unphysical longitudinal photon field is non-observable and actually has an arbitrary value. We then re-examine the Dirac quantization condition and find that its derivation involves solely the unphysical longitudinal coupling. Hence an inconsistency inevitably arises in the presence of Dirac monopoles and this can be considered as a theoretical evidence against their existence. An alternative, independent proof of this conclusion is also presented.
|
0909.3003
|
Yong-Yeon Keum
|
Sarira Sahu, Nissim Fraija and Yong-Yeon Keum
|
Propagation of Neutrinos through Magnetized Gamma-Ray Burst Fireball
|
Revtex, 19 pages, 7 figures, minor revised version
|
JCAP 0911:024,2009
|
10.1088/1475-7516/2009/11/024
|
preprint: ICN/000-03-HEP, KIAS-P09049
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The neutrino self-energy is calculated in a weakly magnetized plasma consists
of electrons, protons, neutrons and their anti-particles and using this we have
calculated the neutrino effective potential up to order $M^{-4}_W$. In the
absence of magnetic field it reduces to the known result. We have also
calculated explicitly the effective potentials for different backgrounds which
may be helpful in different environments. By considering the mixing of three
active neutrinos in the medium with the magnetic field we have derived the
survival and conversion probabilities of neutrinos from one flavor to another
and also the resonance condition is derived. As an application of the above, we
considered the dense and relativistic plasma of the Gamma-Ray Bursts fireball
through which neutrinos of 5-30 MeV can propagate and depending on the fireball
parameters they may oscillate resonantly or non-resonantly from one flavor to
another. These MeV neutrinos are produced due to stellar collapse or merger
events which trigger the Gamma-Ray Burst. The fireball itself also produces MeV
neutrinos due to electron positron annihilation, inverse beta decay and
nucleonic bremsstrahlung. Using the three neutrino mixing and considering the
best fit values of the neutrino parameters, we found that electron neutrinos
are hard to oscillate to another flavors. On the other hand, the muon neutrinos
and the tau neutrinos oscillate with equal probability to one another, which
depends on the neutrino energy, temperature and size of the fireball.
Comparison of oscillation probabilities with and without magnetic field shows
that, they depend on the neutrino energy and also on the size of the fireball.
By using the resonance condition, we have also estimated the resonance length
of the propagating neutrinos as well as the baryon content of the fireball.
|
[
{
"created": "Wed, 16 Sep 2009 18:49:07 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Nov 2009 04:54:24 GMT",
"version": "v2"
}
] |
2009-12-10
|
[
[
"Sahu",
"Sarira",
""
],
[
"Fraija",
"Nissim",
""
],
[
"Keum",
"Yong-Yeon",
""
]
] |
The neutrino self-energy is calculated in a weakly magnetized plasma consists of electrons, protons, neutrons and their anti-particles and using this we have calculated the neutrino effective potential up to order $M^{-4}_W$. In the absence of magnetic field it reduces to the known result. We have also calculated explicitly the effective potentials for different backgrounds which may be helpful in different environments. By considering the mixing of three active neutrinos in the medium with the magnetic field we have derived the survival and conversion probabilities of neutrinos from one flavor to another and also the resonance condition is derived. As an application of the above, we considered the dense and relativistic plasma of the Gamma-Ray Bursts fireball through which neutrinos of 5-30 MeV can propagate and depending on the fireball parameters they may oscillate resonantly or non-resonantly from one flavor to another. These MeV neutrinos are produced due to stellar collapse or merger events which trigger the Gamma-Ray Burst. The fireball itself also produces MeV neutrinos due to electron positron annihilation, inverse beta decay and nucleonic bremsstrahlung. Using the three neutrino mixing and considering the best fit values of the neutrino parameters, we found that electron neutrinos are hard to oscillate to another flavors. On the other hand, the muon neutrinos and the tau neutrinos oscillate with equal probability to one another, which depends on the neutrino energy, temperature and size of the fireball. Comparison of oscillation probabilities with and without magnetic field shows that, they depend on the neutrino energy and also on the size of the fireball. By using the resonance condition, we have also estimated the resonance length of the propagating neutrinos as well as the baryon content of the fireball.
|
1606.01047
|
Smruti Patel
|
Smruti Patel and P C Vinodkumar
|
Tetraquark states in the bottom sector and the status of the
$Y_b$(10890) state
|
arXiv admin note: text overlap with arXiv:1306.0695 by other authors
| null |
10.1140/epjc/s10052-016-4186-6
| null |
hep-ph
|
http://creativecommons.org/publicdomain/zero/1.0/
|
We have done the exploratory study of bottom tetraquarks ($[bq\bar b \bar
q];{q\in u,d}$) in the diquark-antidiquark framework with the inclusion of spin
hyperfine, spin-orbit and tensor components of the one gluon exchange
interaction. Our focus here is on the $Y_b$(10890) and other exotic states in
the bottom sector. We have predicted some of the bottom counterparts to the
charm tetraquark candidates. Our present study shows that if $Z_b(10610)$ and
$Z_b(10650)$ are diquark-diantiquark states then they have to be first radial
excitations only and we have predicted $Z_b(10650)$ state as first radial
excitation of tetraquark state $X_b$ (10.143-10.230). We have identified $X_b$
state with $J^{PC}= 1^{+-}/0^{++}$ as being the analogue of $Z_c(3900)$. An
observation of the $X_b$ will provide a deeper insight into the exotic hadron
spectroscopy and is helpful to unravel the nature of the states connected by
the heavy quark symmetry. We particularly focus on the lowest P wave $[bq][\bar
b\bar q]$ states with $J^{PC}=1^{--}$ by computing their leptonic, hadronic and
radiative decay widths to predict the status of still controversial
$Y_b$(10890) state. Apart from this, we have also shown here the possibility of
mixing of P wave states. In the case of mixing of $1^{--}$ state with different
spin multiplicities, we found that predicted masses of the mixed P states
differ from $Y_b$(10890) state only by $\pm20$ MeV energy difference which can
be helpful to resolve further the structure of $Y_b$(10890).
|
[
{
"created": "Fri, 3 Jun 2016 11:27:19 GMT",
"version": "v1"
}
] |
2016-07-20
|
[
[
"Patel",
"Smruti",
""
],
[
"Vinodkumar",
"P C",
""
]
] |
We have done the exploratory study of bottom tetraquarks ($[bq\bar b \bar q];{q\in u,d}$) in the diquark-antidiquark framework with the inclusion of spin hyperfine, spin-orbit and tensor components of the one gluon exchange interaction. Our focus here is on the $Y_b$(10890) and other exotic states in the bottom sector. We have predicted some of the bottom counterparts to the charm tetraquark candidates. Our present study shows that if $Z_b(10610)$ and $Z_b(10650)$ are diquark-diantiquark states then they have to be first radial excitations only and we have predicted $Z_b(10650)$ state as first radial excitation of tetraquark state $X_b$ (10.143-10.230). We have identified $X_b$ state with $J^{PC}= 1^{+-}/0^{++}$ as being the analogue of $Z_c(3900)$. An observation of the $X_b$ will provide a deeper insight into the exotic hadron spectroscopy and is helpful to unravel the nature of the states connected by the heavy quark symmetry. We particularly focus on the lowest P wave $[bq][\bar b\bar q]$ states with $J^{PC}=1^{--}$ by computing their leptonic, hadronic and radiative decay widths to predict the status of still controversial $Y_b$(10890) state. Apart from this, we have also shown here the possibility of mixing of P wave states. In the case of mixing of $1^{--}$ state with different spin multiplicities, we found that predicted masses of the mixed P states differ from $Y_b$(10890) state only by $\pm20$ MeV energy difference which can be helpful to resolve further the structure of $Y_b$(10890).
|
2103.06050
|
Murat Abdughani
|
Bin Zhu, Murat Abdughani
|
Thermal Relic of Self-Interacting Dark Matter with Retarded Decay of
Mediator
|
20 pages, 6 figures, Version accepted for JHEP
| null |
10.1007/JHEP12(2021)059
| null |
hep-ph astro-ph.HE
|
http://creativecommons.org/publicdomain/zero/1.0/
|
The existence of a light mediator is beneficial to some phenomena in
astroparticle physics, such as the core-cusp problem and diversity problem. It
can decouple from Standard Model to avoid direct detection constraints,
generally realized by retard decay of the mediator. Their out-of-equilibrium
decay process changes the dark matter (DM) freeze-out via temperature
discrepancy. This type of hidden sector (HS) typically requires a precision
calculation of the freeze-out process considering HS temperature evolution and
the thermal average of the cross-section. If the mediator is light
sufficiently, we can not ignore the s-wave radiative bound state formation
process from the perspective of CMB ionization and Sommerfeld enhancement. We
put large mass splitting between DM and mediator, different temperature
evolution on the same theoretical footing, discussing the implication for DM
relic density in this HS. We study this model and illustrate its property by
considering the general Higgs-portal dark matter scenario, which includes all
the relevant constraints and signals. It shows that the combination of BBN and
CMB constraint favors the not-too-hot HS, $r_{\mathrm{inf}}<10^2$, for the
positive cubic interaction of mediator scenario. On the other hand, the
negative cubic interaction is ruled out except for our proposed blind spot
scenario.
|
[
{
"created": "Wed, 10 Mar 2021 13:49:42 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Nov 2021 09:32:19 GMT",
"version": "v2"
}
] |
2022-01-05
|
[
[
"Zhu",
"Bin",
""
],
[
"Abdughani",
"Murat",
""
]
] |
The existence of a light mediator is beneficial to some phenomena in astroparticle physics, such as the core-cusp problem and diversity problem. It can decouple from Standard Model to avoid direct detection constraints, generally realized by retard decay of the mediator. Their out-of-equilibrium decay process changes the dark matter (DM) freeze-out via temperature discrepancy. This type of hidden sector (HS) typically requires a precision calculation of the freeze-out process considering HS temperature evolution and the thermal average of the cross-section. If the mediator is light sufficiently, we can not ignore the s-wave radiative bound state formation process from the perspective of CMB ionization and Sommerfeld enhancement. We put large mass splitting between DM and mediator, different temperature evolution on the same theoretical footing, discussing the implication for DM relic density in this HS. We study this model and illustrate its property by considering the general Higgs-portal dark matter scenario, which includes all the relevant constraints and signals. It shows that the combination of BBN and CMB constraint favors the not-too-hot HS, $r_{\mathrm{inf}}<10^2$, for the positive cubic interaction of mediator scenario. On the other hand, the negative cubic interaction is ruled out except for our proposed blind spot scenario.
|
2302.13071
|
Karin Sch\"onning
|
Karin Sch\"onning, Varvara Batozskaya, Patrik Adlarson and Xiaorong
Zhou
|
Production and decay of polarized hyperon-antihyperon pairs
|
27 pages, 9 figures
|
Chinese Physics C 47, 052002 (2023)
|
10.1088/1674-1137/acc790
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
Polarized hyperon-antihyperon pairs shed light on various unresolved puzzles
in contemporary physics: How the strong interaction confines quarks into
hadrons, how accurately the Standard Model describes microcosmos and even why
our universe consists of so much more matter than antimatter. Thanks to their
weak, parity violating decays, hyperons reveal their spin properties. This can
be exploited e.g. the decomposition of the electromagnetic structure of
hyperons, precision tests of flavour symmetry and searches for CP violation. At
the BESIII experiment at BEPC-II, Beijing, China, hyperon-antihyperon pairs can
be produced in abundance. Recently collected large data samples have triggered
the development of new methods that provide unprecedented precision and a
plethora of new results have emerged. When applied at future high-intensity
facilities like PANDA and STCF, precision physics will be taken to a new level
which can contribute to the solution to the aforementioned puzzles.
|
[
{
"created": "Sat, 25 Feb 2023 12:15:54 GMT",
"version": "v1"
}
] |
2024-01-09
|
[
[
"Schönning",
"Karin",
""
],
[
"Batozskaya",
"Varvara",
""
],
[
"Adlarson",
"Patrik",
""
],
[
"Zhou",
"Xiaorong",
""
]
] |
Polarized hyperon-antihyperon pairs shed light on various unresolved puzzles in contemporary physics: How the strong interaction confines quarks into hadrons, how accurately the Standard Model describes microcosmos and even why our universe consists of so much more matter than antimatter. Thanks to their weak, parity violating decays, hyperons reveal their spin properties. This can be exploited e.g. the decomposition of the electromagnetic structure of hyperons, precision tests of flavour symmetry and searches for CP violation. At the BESIII experiment at BEPC-II, Beijing, China, hyperon-antihyperon pairs can be produced in abundance. Recently collected large data samples have triggered the development of new methods that provide unprecedented precision and a plethora of new results have emerged. When applied at future high-intensity facilities like PANDA and STCF, precision physics will be taken to a new level which can contribute to the solution to the aforementioned puzzles.
|
1410.0613
|
Sophia Chabysheva
|
S.S. Chabysheva
|
The light-front coupled-cluster method applied to $\phi_{1+1}^4$ theory
|
8 pages, 1 figure; RevTeX 4.1; based on talk at Lightcone 2014
workshop, Raleigh, NC, May 26-30, 2014
| null |
10.1007/s00601-014-0930-3
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We use the light-front coupled-cluster (LFCC) method to compute the
odd-parity massive eigenstate of $\phi_{1+1}^4$ theory. A standard Fock-space
truncation of the eigenstate yields a finite set of linear equations for a
finite number of wave functions. The LFCC method replaces Fock-space truncation
with a more sophisticated truncation; the eigenvalue problem is reduced to a
finite set of nonlinear equations without any restriction on Fock space, but
with restrictions on the Fock wave functions. We compare our results with those
obtained with a Fock-space truncation.
|
[
{
"created": "Thu, 2 Oct 2014 17:25:07 GMT",
"version": "v1"
}
] |
2015-06-23
|
[
[
"Chabysheva",
"S. S.",
""
]
] |
We use the light-front coupled-cluster (LFCC) method to compute the odd-parity massive eigenstate of $\phi_{1+1}^4$ theory. A standard Fock-space truncation of the eigenstate yields a finite set of linear equations for a finite number of wave functions. The LFCC method replaces Fock-space truncation with a more sophisticated truncation; the eigenvalue problem is reduced to a finite set of nonlinear equations without any restriction on Fock space, but with restrictions on the Fock wave functions. We compare our results with those obtained with a Fock-space truncation.
|
0705.1504
|
Jeff Forshaw
|
Jeff Forshaw and Malin Sjodahl
|
Soft gluons in Higgs plus two jet production
|
15 pages and 5 figures
|
JHEP 0709:119,2007
|
10.1088/1126-6708/2007/09/119
| null |
hep-ph
| null |
We investigate the effects of an all order QCD resummation of soft gluon
emissions for Higgs boson production in association with two hard jets. We
consider both the gluon-gluon fusion and weak boson fusion processes and show
how to resum a large part of the leading logarithms in the jet veto scale. Our
resummation improves on previous analyses which also aim to include the effects
of multiple soft gluon radiation. In addition we calculate the interference
between weak boson fusion and gluon-gluon fusion and find that it is small.
|
[
{
"created": "Thu, 10 May 2007 16:09:21 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Sep 2007 13:23:05 GMT",
"version": "v2"
}
] |
2009-04-22
|
[
[
"Forshaw",
"Jeff",
""
],
[
"Sjodahl",
"Malin",
""
]
] |
We investigate the effects of an all order QCD resummation of soft gluon emissions for Higgs boson production in association with two hard jets. We consider both the gluon-gluon fusion and weak boson fusion processes and show how to resum a large part of the leading logarithms in the jet veto scale. Our resummation improves on previous analyses which also aim to include the effects of multiple soft gluon radiation. In addition we calculate the interference between weak boson fusion and gluon-gluon fusion and find that it is small.
|
hep-ph/0402172
|
Sally Dawson
|
S. Dawson, D. Dicus, C. Kao, and R. Malhotra
|
Discovering the Higgs Bosons of Minimal Supersymmetry with Muons and a
Bottom Quark
|
Version to appear in Phys. Rev. Lett
|
Phys.Rev.Lett. 92 (2004) 241801
|
10.1103/PhysRevLett.92.241801
| null |
hep-ph
| null |
We investigate the prospects for the discovery at the CERN Large Hadron
Collider of a neutral Higgs boson produced with one bottom quark followed by
Higgs decay into a muon pair. We work within the framework of the minimal
supersymmetric model. The dominant physics background from the production of $b
\mu^+\mu^-$, $j\mu^+\mu^-$, j=g,u,d,s,c, and $b {\bar b} W^+W^-$ is calculated
with realistic acceptance cuts. Promising results are found for the CP-odd
pseudoscalar ($A^0$) and the heavier CP-even scalar ($H^0$) Higgs bosons with
masses up to 600 GeV. This discovery channel with one energetic bottom quark
greatly improves the discovery potential of the LHC beyond the inclusive
channel $pp\to \phi^0\to \mu^+\mu^- +X$.
|
[
{
"created": "Tue, 17 Feb 2004 17:26:36 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Feb 2004 02:23:32 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Apr 2004 19:38:43 GMT",
"version": "v3"
}
] |
2009-11-10
|
[
[
"Dawson",
"S.",
""
],
[
"Dicus",
"D.",
""
],
[
"Kao",
"C.",
""
],
[
"Malhotra",
"R.",
""
]
] |
We investigate the prospects for the discovery at the CERN Large Hadron Collider of a neutral Higgs boson produced with one bottom quark followed by Higgs decay into a muon pair. We work within the framework of the minimal supersymmetric model. The dominant physics background from the production of $b \mu^+\mu^-$, $j\mu^+\mu^-$, j=g,u,d,s,c, and $b {\bar b} W^+W^-$ is calculated with realistic acceptance cuts. Promising results are found for the CP-odd pseudoscalar ($A^0$) and the heavier CP-even scalar ($H^0$) Higgs bosons with masses up to 600 GeV. This discovery channel with one energetic bottom quark greatly improves the discovery potential of the LHC beyond the inclusive channel $pp\to \phi^0\to \mu^+\mu^- +X$.
|
0709.2058
|
A. V. Luchinsky
|
S. S. Gershtein, A. K. Likhoded, G. P. Pronko
|
Possible nature of $Z^+(4430)$
|
5 pages, 6 figures
| null | null | null |
hep-ph
| null |
We discuss exotic states X(3872) and $Z^+(4430)$, observed recently in
experiment Belle. The QCD-string based explanation is suggested.
|
[
{
"created": "Thu, 13 Sep 2007 12:28:58 GMT",
"version": "v1"
}
] |
2007-09-14
|
[
[
"Gershtein",
"S. S.",
""
],
[
"Likhoded",
"A. K.",
""
],
[
"Pronko",
"G. P.",
""
]
] |
We discuss exotic states X(3872) and $Z^+(4430)$, observed recently in experiment Belle. The QCD-string based explanation is suggested.
|
hep-ph/9906455
|
Oleg Teryaev
|
J. Soffer, O.V. Teryaev
|
Improved positivity bound for Deep Inelastic Scattering on transversely
polarized nucleon
|
LaTeX, 4 pages; CPT--99/P.3845; Talk at Workshop Polarized Protons at
High Eergies (DESY-Hamburg, May 17-20, 1999)
| null | null | null |
hep-ph
| null |
The positivity bound for the transverse asymmetry $A_2$ may be improved by
making use of the fact, that the state of a photon and a nucleon with total
spin 3/2, does not participate to the interference. The bound is therefore
useful in the case of a longitudinal asymmetry small (say, at low $x$) or
negative (like in the neuteron case).
|
[
{
"created": "Tue, 22 Jun 1999 16:33:44 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Soffer",
"J.",
""
],
[
"Teryaev",
"O. V.",
""
]
] |
The positivity bound for the transverse asymmetry $A_2$ may be improved by making use of the fact, that the state of a photon and a nucleon with total spin 3/2, does not participate to the interference. The bound is therefore useful in the case of a longitudinal asymmetry small (say, at low $x$) or negative (like in the neuteron case).
|
hep-ph/0110048
|
Lokhtin
|
I.P. Lokhtin
|
High-mass dimuon, B anti-B and B --> J/Psi production in
ultrarelativistic nucleus-nucleus interactions
|
Talk given at International Workshop on Physics of the Quark-Gluon
Plasma, Palaiseau, France, September 4-7, 2001 ; 6 pages including 4
eps-figures
| null | null | null |
hep-ph
| null |
The potential of B-physics in ultrarelativistic heavy ion collisions is
discussed. The different mechanisms of heavy quark production at high energies
are considered. We analyze the sensitivity of high-mass mu+mu- pairs from BBbar
semileptonic decays and secondary J/Psi's from single B decays to the
medium-induced bottom quark energy loss at LHC energies.
|
[
{
"created": "Wed, 3 Oct 2001 19:23:16 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Oct 2001 15:09:43 GMT",
"version": "v2"
}
] |
2016-09-06
|
[
[
"Lokhtin",
"I. P.",
""
]
] |
The potential of B-physics in ultrarelativistic heavy ion collisions is discussed. The different mechanisms of heavy quark production at high energies are considered. We analyze the sensitivity of high-mass mu+mu- pairs from BBbar semileptonic decays and secondary J/Psi's from single B decays to the medium-induced bottom quark energy loss at LHC energies.
|
hep-ph/0606140
|
Michel Tytgat
|
Michel H.G. Tytgat
|
Relating leptogenesis and dark matter
|
4 pages, 1 figure, to appear in the proceedings of 40th Rencontres de
Moriond, Electroweak Interactions and Unified Theories, March 11 - 18, 2006
| null | null | null |
hep-ph
| null |
A scenario that relates the abundance of dark matter to the baryon asymmetry
of the Universe is presented. In this scenario, based on a left-right extension
of the Standard Model, dark matter is made of light, ~ 1 GeV, right-handed
Majorana neutrinos.
|
[
{
"created": "Mon, 12 Jun 2006 13:14:09 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Tytgat",
"Michel H. G.",
""
]
] |
A scenario that relates the abundance of dark matter to the baryon asymmetry of the Universe is presented. In this scenario, based on a left-right extension of the Standard Model, dark matter is made of light, ~ 1 GeV, right-handed Majorana neutrinos.
|
hep-ph/9606270
|
A. Abada
|
Abdellatif Abada (Manchester U.)
|
Isoscalar NN spin-orbit potential from a Skyrme model with scalar mesons
|
10 pages (revtex) + 2 figures; use \psfig command. Minor changes in
the text and some discussion added in the last section. To be published in Z.
Phys. A
|
Z.Phys. A358 (1997) 85-89
|
10.1007/s002180050280
|
MC/TH 96/17
|
hep-ph
| null |
As a first step toward circumventing the difficulty to obtain an attractive
isospin-independent NN spin-orbit force from Skyrme-type models involving only
pions, we investigate an improved Skyrme Lagrangian that incorporates the
scalar-isoscalar meson \epsilon which can be viewed as the cause behind the
enhancement of the $\pi \pi S$-wave. We find that at large distances, the main
contribution to the spin-orbit potential comes from the scalar Lagrangian and
it is found to be attractive. We briefly discuss how to pursue this work to
finally obtain a medium-range attractive interaction.
|
[
{
"created": "Fri, 7 Jun 1996 17:19:16 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jan 1997 11:04:48 GMT",
"version": "v2"
}
] |
2016-09-06
|
[
[
"Abada",
"Abdellatif",
"",
"Manchester U."
]
] |
As a first step toward circumventing the difficulty to obtain an attractive isospin-independent NN spin-orbit force from Skyrme-type models involving only pions, we investigate an improved Skyrme Lagrangian that incorporates the scalar-isoscalar meson \epsilon which can be viewed as the cause behind the enhancement of the $\pi \pi S$-wave. We find that at large distances, the main contribution to the spin-orbit potential comes from the scalar Lagrangian and it is found to be attractive. We briefly discuss how to pursue this work to finally obtain a medium-range attractive interaction.
|
hep-ph/0204169
|
Stefano Rigolin
|
Stefano Rigolin (CERN)
|
An alternative approach to b->s\gamma in the unconstrained MSSM
|
6 pages, 4 eps figure, talk given at the XXXVIIth Rencontres de
Moriond (ELECTROWEAK)
| null | null | null |
hep-ph
| null |
The gluino contributions to the $C'_{7,8}$ Wilson coefficients for b->s\gamma
are calculated within the unconstrained MSSM. New stringent bounds on the
\dRLbs and \dRRbs mass insertion parameters are obtained in the limit in which
the SM and SUSY contributions to $C_{7,8}$ approximately cancel. Such a
cancellation can plausibly appear within several classes of SUSY breaking
models. Assuming this cancellation takes place, we perform an analysis of the
b->s\gamma decay. We show that, in the unconstrained MSSM such an alternative
is reasonable and it is possible to saturate the b->s\gamma branching ratio and
produce a CP asymmetry of up to 20%, from only the gluino contribution to
$C'_{7,8}$ coefficients. Using photon polarization a LR asymmetry can be
defined that in principle allows the $C_{7,8}$ and $C'_{7,8}$ contributions to
the b->s\gamma decay to be disentangled.
|
[
{
"created": "Mon, 15 Apr 2002 13:27:27 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Rigolin",
"Stefano",
"",
"CERN"
]
] |
The gluino contributions to the $C'_{7,8}$ Wilson coefficients for b->s\gamma are calculated within the unconstrained MSSM. New stringent bounds on the \dRLbs and \dRRbs mass insertion parameters are obtained in the limit in which the SM and SUSY contributions to $C_{7,8}$ approximately cancel. Such a cancellation can plausibly appear within several classes of SUSY breaking models. Assuming this cancellation takes place, we perform an analysis of the b->s\gamma decay. We show that, in the unconstrained MSSM such an alternative is reasonable and it is possible to saturate the b->s\gamma branching ratio and produce a CP asymmetry of up to 20%, from only the gluino contribution to $C'_{7,8}$ coefficients. Using photon polarization a LR asymmetry can be defined that in principle allows the $C_{7,8}$ and $C'_{7,8}$ contributions to the b->s\gamma decay to be disentangled.
|
1305.3555
|
Anton Godizov
|
A.A. Godizov
|
The hard pomeron intercept and the data on the proton unpolarized
structure function
|
5 pages, minor corrections
|
Nucl. Phys. A 927 (2014) 36-40
|
10.1016/j.nuclphysa.2014.03.011
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It is demonstrated that the hard pomeron intercept value can be estimated
directly from the data on the proton unpolarized structure function:
$\alpha_{\rm P}^h(0)-1=0.317\pm 0.028$.
|
[
{
"created": "Wed, 15 May 2013 17:23:08 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Oct 2013 13:33:20 GMT",
"version": "v2"
},
{
"created": "Sat, 29 Mar 2014 09:02:40 GMT",
"version": "v3"
}
] |
2014-06-10
|
[
[
"Godizov",
"A. A.",
""
]
] |
It is demonstrated that the hard pomeron intercept value can be estimated directly from the data on the proton unpolarized structure function: $\alpha_{\rm P}^h(0)-1=0.317\pm 0.028$.
|
2212.00282
|
Oleg Popov
|
Rena Ciftci, Abbas Kenan Ciftci, and Oleg Popov
|
Democratic parameterization and analysis for 331 model as a subgroup of
$SU(6)$
|
21 pages, 5 figures, 2 tables. arXiv admin note: text overlap with
arXiv:2211.16529
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A democratic parameterization is introduced for $SU(3)_C\otimes
SU(3)_L\otimes U(1)_X$ extension of the Standard Model, which is inspired by
$SU(6)$ symmetry. In the novel scenario all Cabibbo-Kobayashi-Maskawa mixing
angles and quark masses, nine observable quantities in total, are predicted
within 1$-$3 standard deviations of the experimental values with a minimum
number of input parameters. The present work provides the thorough numerical
analysis and correlations between input parameters and predicted quantities.
$\chi^2\approx 0.67$ with $\forall\sigma<0.61$ corresponds to the best global
fit benchmark point. Benefits of the new parameterization and future prospects
are discussed as well.
|
[
{
"created": "Thu, 1 Dec 2022 05:00:45 GMT",
"version": "v1"
}
] |
2022-12-02
|
[
[
"Ciftci",
"Rena",
""
],
[
"Ciftci",
"Abbas Kenan",
""
],
[
"Popov",
"Oleg",
""
]
] |
A democratic parameterization is introduced for $SU(3)_C\otimes SU(3)_L\otimes U(1)_X$ extension of the Standard Model, which is inspired by $SU(6)$ symmetry. In the novel scenario all Cabibbo-Kobayashi-Maskawa mixing angles and quark masses, nine observable quantities in total, are predicted within 1$-$3 standard deviations of the experimental values with a minimum number of input parameters. The present work provides the thorough numerical analysis and correlations between input parameters and predicted quantities. $\chi^2\approx 0.67$ with $\forall\sigma<0.61$ corresponds to the best global fit benchmark point. Benefits of the new parameterization and future prospects are discussed as well.
|
hep-ph/0305142
|
Vladimir Smirnov
|
V.A. Smirnov
|
Analytical Result for Dimensionally Regularized Massless On-Shell Planar
Triple Box
|
8 pages, LaTeX with axodraw.sty
|
Phys.Lett. B567 (2003) 193-199
|
10.1016/S0370-2693(03)00895-5
| null |
hep-ph
| null |
The dimensionally regularized massless on-shell planar triple box Feynman
diagram with powers of propagators equal to one is analytically evaluated for
general values of the Mandelstam variables s and t in a Laurent expansion in
the parameter \ep=(4-d)/2 of dimensional regularization up to a finite part. An
explicit result is expressed in terms of harmonic polylogarithms, with
parameters 0 and 1, up to the sixth order. The evaluation is based on the
method of Feynman parameters and multiple Mellin-Barnes representation. The
same technique can be quite similarly applied to planar triple boxes with any
numerators and integer powers of the propagators.
|
[
{
"created": "Tue, 13 May 2003 15:51:43 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Smirnov",
"V. A.",
""
]
] |
The dimensionally regularized massless on-shell planar triple box Feynman diagram with powers of propagators equal to one is analytically evaluated for general values of the Mandelstam variables s and t in a Laurent expansion in the parameter \ep=(4-d)/2 of dimensional regularization up to a finite part. An explicit result is expressed in terms of harmonic polylogarithms, with parameters 0 and 1, up to the sixth order. The evaluation is based on the method of Feynman parameters and multiple Mellin-Barnes representation. The same technique can be quite similarly applied to planar triple boxes with any numerators and integer powers of the propagators.
|
0804.3050
|
Jason Evans
|
Eung Jin Chun, Jason L. Evans, David E. Morrissey, James D. Wells
|
Higgs Boson Exempt No-Scale Supersymmetry with a Neutrino Seesaw:
Implications for Lepton Flavor Violation and Leptogenesis
|
25 pages, 11 figures; Added a reference
|
Phys.Rev.D79:015003,2009
|
10.1103/PhysRevD.79.015003
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by the observation of neutrino oscillations, we extend the Higgs
boson exempt no-scale supersymmetry model (HENS) by adding three heavy
right-handed neutrino chiral supermultiplets to generate the light neutrino
masses and mixings. The neutrino Yukawa couplings can induce new lepton flavor
violating couplings among the soft terms in the course of renormalization group
running down from the boundary scale. We study the effects this has on the
predictions for low-energy probes of lepton flavor violation(LFV). Heavy
right-handed neutrinos also provide a way to generate the baryon asymmetry
through leptogenesis. We find that consistency with LFV and leptogenesis puts
strong requirements on either the form of the Yukawa mass matrix or the
smallness of the Higgs up soft mass. In all cases, we generically expect that
new physics LFV is non-zero and can be found in a future experiment.
|
[
{
"created": "Fri, 18 Apr 2008 15:43:28 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Jul 2008 18:40:56 GMT",
"version": "v2"
}
] |
2009-01-21
|
[
[
"Chun",
"Eung Jin",
""
],
[
"Evans",
"Jason L.",
""
],
[
"Morrissey",
"David E.",
""
],
[
"Wells",
"James D.",
""
]
] |
Motivated by the observation of neutrino oscillations, we extend the Higgs boson exempt no-scale supersymmetry model (HENS) by adding three heavy right-handed neutrino chiral supermultiplets to generate the light neutrino masses and mixings. The neutrino Yukawa couplings can induce new lepton flavor violating couplings among the soft terms in the course of renormalization group running down from the boundary scale. We study the effects this has on the predictions for low-energy probes of lepton flavor violation(LFV). Heavy right-handed neutrinos also provide a way to generate the baryon asymmetry through leptogenesis. We find that consistency with LFV and leptogenesis puts strong requirements on either the form of the Yukawa mass matrix or the smallness of the Higgs up soft mass. In all cases, we generically expect that new physics LFV is non-zero and can be found in a future experiment.
|
2308.16722
|
Andrea Dubla Dr
|
L. Vermunt, Y. Seemann, A. Dubla, S. Floerchinger, E. Grossi, A.
Kirchner, S. Masciocchi, I. Selyuzhenkov
|
Mapping properties of the quark gluon plasma in Pb-Pb and Xe-Xe
collisions at energies available at the CERN Large Hadron Collider
|
17 pages, 7 figures
| null |
10.1103/PhysRevC.108.064908
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A phenomenological analysis of the experimental measurements of transverse
momentum spectra of identified charged hadrons and strange hyperons in Pb-Pb
and Xe-Xe collisions at the LHC is presented. The analysis is based on the
relativistic fluid dynamics description implemented in the numerically
efficient \textsc{Fluid{\it u}M} approach. Building on our previous work, we
separate in our treatment the chemical and kinetic freeze-out, and incorporate
the partial chemical equilibrium to describe the late stages of the collision
evolution. This analysis makes use of Bayesian inference to determine key
parameters of the QGP evolution and its properties including the shear and bulk
viscosity to entropy ratios, the initialisation time, the initial entropy
density, and the freeze-out temperatures. The physics parameters and their
posterior probabilities are extracted using a global search in multidimensional
space with modern machine learning tools, such as ensembles of neural networks.
We employ our newly developed fast framework to assess systematic uncertainties
in the extracted model parameters by systematically varying key components of
our analysis.
|
[
{
"created": "Thu, 31 Aug 2023 13:40:00 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Dec 2023 15:29:11 GMT",
"version": "v2"
}
] |
2023-12-21
|
[
[
"Vermunt",
"L.",
""
],
[
"Seemann",
"Y.",
""
],
[
"Dubla",
"A.",
""
],
[
"Floerchinger",
"S.",
""
],
[
"Grossi",
"E.",
""
],
[
"Kirchner",
"A.",
""
],
[
"Masciocchi",
"S.",
""
],
[
"Selyuzhenkov",
"I.",
""
]
] |
A phenomenological analysis of the experimental measurements of transverse momentum spectra of identified charged hadrons and strange hyperons in Pb-Pb and Xe-Xe collisions at the LHC is presented. The analysis is based on the relativistic fluid dynamics description implemented in the numerically efficient \textsc{Fluid{\it u}M} approach. Building on our previous work, we separate in our treatment the chemical and kinetic freeze-out, and incorporate the partial chemical equilibrium to describe the late stages of the collision evolution. This analysis makes use of Bayesian inference to determine key parameters of the QGP evolution and its properties including the shear and bulk viscosity to entropy ratios, the initialisation time, the initial entropy density, and the freeze-out temperatures. The physics parameters and their posterior probabilities are extracted using a global search in multidimensional space with modern machine learning tools, such as ensembles of neural networks. We employ our newly developed fast framework to assess systematic uncertainties in the extracted model parameters by systematically varying key components of our analysis.
|
hep-ph/9308225
| null |
Palash B. Pal, Utpal Sarkar
|
Proton Decay and Related Processes in Unified Models with Gauged Baryon
Number:
|
(32 pages LATEX) [DOE-ER\,40757-022, CPP-93-22] {Small changes made
and two references added. This version will appear in Phys. Rev. D}
|
Phys.Rev.D49:3721-3733,1994
|
10.1103/PhysRevD.49.3721
| null |
hep-ph
| null |
In unification models based on SU(15) or SU(16), baryon number is part of the
gauge symmetry, broken spontaneously. In such models, we discuss various
scenarios of important baryon number violating processes like proton decay and
neutron-antineutron oscillation. Our analysis depends on the effective operator
method, and covers many variations of symmetry breaking, including different
intermediate groups and different Higgs boson content. We discuss processes
mediated by gauge bosons and Higgs bosons parallely. We show how accidental
global or discrete symmetries present in the full gauge invariant Lagrangian
restrict baryon number violating processes in these models. In all cases, we
find that baryon number violating interactions are sufficiently suppressed to
allow grand unification at energies much lower than the usual $10^{16}$ GeV.
|
[
{
"created": "Wed, 4 Aug 1993 18:33:33 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jan 1994 00:02:25 GMT",
"version": "v2"
}
] |
2010-11-01
|
[
[
"Pal",
"Palash B.",
""
],
[
"Sarkar",
"Utpal",
""
]
] |
In unification models based on SU(15) or SU(16), baryon number is part of the gauge symmetry, broken spontaneously. In such models, we discuss various scenarios of important baryon number violating processes like proton decay and neutron-antineutron oscillation. Our analysis depends on the effective operator method, and covers many variations of symmetry breaking, including different intermediate groups and different Higgs boson content. We discuss processes mediated by gauge bosons and Higgs bosons parallely. We show how accidental global or discrete symmetries present in the full gauge invariant Lagrangian restrict baryon number violating processes in these models. In all cases, we find that baryon number violating interactions are sufficiently suppressed to allow grand unification at energies much lower than the usual $10^{16}$ GeV.
|
hep-ph/9311352
|
Kiwoon Choi
|
Kiwoon Choi
|
Small SUSY phases in string-inspired supergravity
|
15pages, Latex, SNUTP 93-85
|
Phys.Rev.Lett.72:1592-1595,1994
|
10.1103/PhysRevLett.72.1592
| null |
hep-ph
| null |
In supersymmetric models, there are new CP violating phases which, if
unsuppressed, would give a too large neutron electric dipole moment. We examine
the possibility of small SUSY phases in string-inspired supergravity models in
which supersymmetry is broken by the auxiliary components of the dilaton and
moduli superfields. It is found that the SUSY phases can be suppressed by a
small factor governing the breakdown of the approximate Peccei Quinn symmetries
nonlinearly realized for the moduli superfields that participate in
supersymmetry breaking. In many cases, the symmetry breaking factors are
exponentially small for moderately large values of the moduli, leading to small
phase values in a natural way.
|
[
{
"created": "Wed, 24 Nov 1993 05:27:20 GMT",
"version": "v1"
}
] |
2010-11-01
|
[
[
"Choi",
"Kiwoon",
""
]
] |
In supersymmetric models, there are new CP violating phases which, if unsuppressed, would give a too large neutron electric dipole moment. We examine the possibility of small SUSY phases in string-inspired supergravity models in which supersymmetry is broken by the auxiliary components of the dilaton and moduli superfields. It is found that the SUSY phases can be suppressed by a small factor governing the breakdown of the approximate Peccei Quinn symmetries nonlinearly realized for the moduli superfields that participate in supersymmetry breaking. In many cases, the symmetry breaking factors are exponentially small for moderately large values of the moduli, leading to small phase values in a natural way.
|
0906.2417
|
Konstantin Matchev
|
Konstantin T. Matchev, Filip Moortgat, Luc Pape, Myeonghun Park
|
Precise reconstruction of sparticle masses without ambiguities
|
37 pages, added a new figure in the Appendix, published version
|
JHEP 0908:104,2009
|
10.1088/1126-6708/2009/08/104
|
UFIFT-HEP-09-04
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We critically reexamine the standard applications of the method of
kinematical endpoints for sparticle mass determination. We consider the typical
decay chain in supersymmetry (SUSY) squark -> neutralino -> slepton -> LSP,
which yields a jet j and two leptons ln and lf. The conventional approaches use
the upper kinematical endpoints of the individual distributions m_{jll},
m_{jl(lo)} and m_{jl(hi)}, all three of which suffer from parameter space
region ambiguities and may lead to multiple solutions for the SUSY mass
spectrum. In contrast, we do not use m_{jll}, m_{jl(lo)} and m_{jl(hi)}, and
instead propose a new set of (infinitely many) variables whose upper kinematic
endpoints exhibit reduced sensitivity to the parameter space region. We then
outline an alternative, much simplified procedure for obtaining the SUSY mass
spectrum. In particular, we show that the four endpoints observed in the three
distributions m^2_{ll}, m^2_{jln} U m^2_{jlf} and m^2_{jln}+m^2_{jlf} are
sufficient to completely pin down the squark mass and the two neutralino
masses, leaving only a discrete 2-fold ambiguity for the slepton mass. This
remaining ambiguity can be easily resolved in a number of different ways: for
example, by a single additional measurement of the kinematic endpoint of any
one out of the many remaining 1-dimensional distributions at our disposal, or
by exploring the correlations in the 2-dimensional distribution of m^2_{jln} U
m^2_{jlf} versus m^2_{ll}. We illustrate our method with two examples: the LM1
and LM6 CMS study points. An additional advantage of our method is the expected
improvement in the accuracy of the SUSY mass determination, due to the
multitude and variety of available measurements.
|
[
{
"created": "Fri, 12 Jun 2009 20:03:41 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Aug 2009 15:47:12 GMT",
"version": "v2"
}
] |
2009-09-28
|
[
[
"Matchev",
"Konstantin T.",
""
],
[
"Moortgat",
"Filip",
""
],
[
"Pape",
"Luc",
""
],
[
"Park",
"Myeonghun",
""
]
] |
We critically reexamine the standard applications of the method of kinematical endpoints for sparticle mass determination. We consider the typical decay chain in supersymmetry (SUSY) squark -> neutralino -> slepton -> LSP, which yields a jet j and two leptons ln and lf. The conventional approaches use the upper kinematical endpoints of the individual distributions m_{jll}, m_{jl(lo)} and m_{jl(hi)}, all three of which suffer from parameter space region ambiguities and may lead to multiple solutions for the SUSY mass spectrum. In contrast, we do not use m_{jll}, m_{jl(lo)} and m_{jl(hi)}, and instead propose a new set of (infinitely many) variables whose upper kinematic endpoints exhibit reduced sensitivity to the parameter space region. We then outline an alternative, much simplified procedure for obtaining the SUSY mass spectrum. In particular, we show that the four endpoints observed in the three distributions m^2_{ll}, m^2_{jln} U m^2_{jlf} and m^2_{jln}+m^2_{jlf} are sufficient to completely pin down the squark mass and the two neutralino masses, leaving only a discrete 2-fold ambiguity for the slepton mass. This remaining ambiguity can be easily resolved in a number of different ways: for example, by a single additional measurement of the kinematic endpoint of any one out of the many remaining 1-dimensional distributions at our disposal, or by exploring the correlations in the 2-dimensional distribution of m^2_{jln} U m^2_{jlf} versus m^2_{ll}. We illustrate our method with two examples: the LM1 and LM6 CMS study points. An additional advantage of our method is the expected improvement in the accuracy of the SUSY mass determination, due to the multitude and variety of available measurements.
|
1110.3971
|
Joao G. Rosa
|
Mar Bastero-Gil, Arjun Berera, Rudnei O. Ramos and Joao G. Rosa
|
Warm baryogenesis
|
6 pages, 1 figure; version to be published in Phys. Lett. B
| null |
10.1016/j.physletb.2012.05.032
|
Edinburgh 2011/29; UG-FT-291/11; CFPE-161/11
|
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that a baryon asymmetry can be generated by dissipative effects
during warm inflation via a supersymmetric two-stage mechanism, where the
inflaton is coupled to heavy mediator fields that then decay into light species
through B- and CP-violating interactions. In contrast with thermal GUT
baryogenesis models, the temperature during inflation is always below the heavy
mass threshold, simultaneously suppressing thermal and quantum corrections to
the inflaton potential and the production of dangerous GUT relics. This
naturally gives a small baryon asymmetry close to the observed value, although
parametrically larger values may be diluted after inflation along with any
gravitino overabundance. Furthermore, this process yields baryon isocurvature
perturbations within the range of future experiments, making this an attractive
and testable model of GUT baryogenesis.
|
[
{
"created": "Tue, 18 Oct 2011 13:33:17 GMT",
"version": "v1"
},
{
"created": "Tue, 15 May 2012 10:30:15 GMT",
"version": "v2"
}
] |
2015-05-30
|
[
[
"Bastero-Gil",
"Mar",
""
],
[
"Berera",
"Arjun",
""
],
[
"Ramos",
"Rudnei O.",
""
],
[
"Rosa",
"Joao G.",
""
]
] |
We show that a baryon asymmetry can be generated by dissipative effects during warm inflation via a supersymmetric two-stage mechanism, where the inflaton is coupled to heavy mediator fields that then decay into light species through B- and CP-violating interactions. In contrast with thermal GUT baryogenesis models, the temperature during inflation is always below the heavy mass threshold, simultaneously suppressing thermal and quantum corrections to the inflaton potential and the production of dangerous GUT relics. This naturally gives a small baryon asymmetry close to the observed value, although parametrically larger values may be diluted after inflation along with any gravitino overabundance. Furthermore, this process yields baryon isocurvature perturbations within the range of future experiments, making this an attractive and testable model of GUT baryogenesis.
|
1903.03528
|
Najmul Haque
|
Aritra Das, Najmul Haque, Munshi G. Mustafa and Pradip K. Roy
|
Hard dilepton production from a weakly magnetized hot QCD medium
|
21 pages, 7 figures, published version
|
Phys. Rev. D 99, 094022 (2019)
|
10.1103/PhysRevD.99.094022
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We have computed the hard dilepton production rate from a weakly magnetized
deconfined QCD medium within one-loop photon self-energy by considering one
hard and one thermomagnetic resummed quark propagator in the loop. In the
presence of the magnetic field, the resummed propagator leads to four
quasiparticle modes. The production of hard dileptons consists of rates when
all four quasiquarks originating from the poles of the propagator individually
annihilate with a hard quark coming from a bare propagator in the loop. Besides
these, there are also contributions from a mixture of pole and Landau cut part.
In weak field approximation, the magnetic field appears as a perturbative
correction to the thermal contribution. Since the calculation is very involved,
for a first effort as well as for simplicity, we obtained the rate up to first
order in the magnetic field, i.e., ${\cal O}[(eB)]$, which causes a marginal
improvement over that in the absence of magnetic field.
|
[
{
"created": "Fri, 8 Mar 2019 16:13:15 GMT",
"version": "v1"
},
{
"created": "Thu, 16 May 2019 16:21:42 GMT",
"version": "v2"
},
{
"created": "Sun, 19 May 2019 12:02:55 GMT",
"version": "v3"
}
] |
2019-05-21
|
[
[
"Das",
"Aritra",
""
],
[
"Haque",
"Najmul",
""
],
[
"Mustafa",
"Munshi G.",
""
],
[
"Roy",
"Pradip K.",
""
]
] |
We have computed the hard dilepton production rate from a weakly magnetized deconfined QCD medium within one-loop photon self-energy by considering one hard and one thermomagnetic resummed quark propagator in the loop. In the presence of the magnetic field, the resummed propagator leads to four quasiparticle modes. The production of hard dileptons consists of rates when all four quasiquarks originating from the poles of the propagator individually annihilate with a hard quark coming from a bare propagator in the loop. Besides these, there are also contributions from a mixture of pole and Landau cut part. In weak field approximation, the magnetic field appears as a perturbative correction to the thermal contribution. Since the calculation is very involved, for a first effort as well as for simplicity, we obtained the rate up to first order in the magnetic field, i.e., ${\cal O}[(eB)]$, which causes a marginal improvement over that in the absence of magnetic field.
|
1805.02925
|
Kenta Takagi
|
Yusuke Shimizu, Kenta Takagi, Morimitsu Tanimoto
|
Towards the minimal seesaw model for the prediction of neutrino CP
violation
|
Proceedings of PPAP 2018
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the minimal seesaw model for the Dirac CP violating phase of the
lepton mixing matrix. We introduce two right-handed Majorana neutrinos and
obtain several textures of the tri-maximal lepton mixing matrices. Moreover, we
discuss the observed baryon asymmetry of the universe through the leptogenesis
mechanism. As the result, we obtain the specific model which predicts the
negative sign of maximal Dirac CP violating phase and normal hierarchy of
neutrino masses.
|
[
{
"created": "Tue, 8 May 2018 09:58:34 GMT",
"version": "v1"
}
] |
2018-05-09
|
[
[
"Shimizu",
"Yusuke",
""
],
[
"Takagi",
"Kenta",
""
],
[
"Tanimoto",
"Morimitsu",
""
]
] |
We discuss the minimal seesaw model for the Dirac CP violating phase of the lepton mixing matrix. We introduce two right-handed Majorana neutrinos and obtain several textures of the tri-maximal lepton mixing matrices. Moreover, we discuss the observed baryon asymmetry of the universe through the leptogenesis mechanism. As the result, we obtain the specific model which predicts the negative sign of maximal Dirac CP violating phase and normal hierarchy of neutrino masses.
|
2408.03720
|
J.K. Chen
|
He Song, Jia-Qi Xie, and Jiao-Kai Chen
|
Regge trajectories for the triply heavy triquarks
|
8 pages, 4 figures, 9 tables. arXiv admin note: text overlap with
arXiv:2407.18280, arXiv:2407.04222
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We attempt to apply the Regge trajectory approach to the triply heavy
triquarks. We present the triquark Regge trajectory relations, and then employ
them to crudely estimate the spectra of the triquarks $((cc)\bar{c})$,
$((cc)\bar{b})$, $((bc)\bar{c})$, $((bc)\bar{b})$, $((bb)\bar{c})$, and
$((bb)\bar{b})$. The $\lambda$-trajectories and the $\rho$-trajectories are
discussed. The triquark Regge trajectory becomes a new and very simple approach
for estimating the spectra of triquarks.
|
[
{
"created": "Wed, 7 Aug 2024 12:17:45 GMT",
"version": "v1"
}
] |
2024-08-08
|
[
[
"Song",
"He",
""
],
[
"Xie",
"Jia-Qi",
""
],
[
"Chen",
"Jiao-Kai",
""
]
] |
We attempt to apply the Regge trajectory approach to the triply heavy triquarks. We present the triquark Regge trajectory relations, and then employ them to crudely estimate the spectra of the triquarks $((cc)\bar{c})$, $((cc)\bar{b})$, $((bc)\bar{c})$, $((bc)\bar{b})$, $((bb)\bar{c})$, and $((bb)\bar{b})$. The $\lambda$-trajectories and the $\rho$-trajectories are discussed. The triquark Regge trajectory becomes a new and very simple approach for estimating the spectra of triquarks.
|
2108.10544
|
Ho-Meoyng Choi
|
Ho-Meoyng Choi (Kyungpook National University)
|
Current-component independent transition form factors for semileptonic
and rare $D\to \pi(K)$ decays in the light-front quark model
|
13 pages, 4 figures, Final version to appear in the Special
Issues(Heavy Flavored Physics and CP Violation) of Advances in High Energy
Physics (AHEP). arXiv admin note: text overlap with arXiv:2102.02015
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We investigate the exclusive semileptonic and rare $D\to \pi(K)$ decays
within the standard model together with the light-front quark model (LFQM)
constrained by the variational principle for the QCD-motivated effective
Hamiltonian. The form factors are obtained in the $q^+=0$ frame and then
analytically continue to the physical timelike region. Together with our recent
analysis of the current-component independent form factors $f_\pm(q^2)$ for the
semileptonic decays, we present the current-component independent tensor form
factor $f_T(q^2)$ for the rare decays to make the complete set of hadronic
matrix elements regulating the semileptonic and rare $D\to\pi(K)$ decays in our
LFQM. The tensor form factor $f_T(q^2)$ are obtained from two independent sets
$(J^{+\perp}_T, J^{+-}_T)$ of the tensor current $J^{\mu\nu}_T$. As in our
recent analysis of $f_-(q^2)$, we show that $f_T(q^2)$ obtained from the two
different sets of the current components gives the identical result in the
valence region of the $q^+=0$ frame without involving the explicit zero modes
and the instantaneous contributions. The implications of the zero modes and the
instantaneous contributions are also discussed in comparison between the
manifestly covariant model and the standard LFQM. In our numerical
calculations, we obtain the $q^2$-dependent form factors $(f_\pm, f_T)$ for
$D\to\pi(K)$ and branching ratios for the semileptonic $D\to
\pi(K)\ell\nu_\ell$ ($\ell=e,\mu$) decays. Our results show in good agreement
with the available experimental data as well as other theoretical model
predictions.
|
[
{
"created": "Tue, 24 Aug 2021 06:54:29 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Oct 2021 02:06:34 GMT",
"version": "v2"
},
{
"created": "Sun, 14 Nov 2021 00:52:55 GMT",
"version": "v3"
}
] |
2021-11-16
|
[
[
"Choi",
"Ho-Meoyng",
"",
"Kyungpook National University"
]
] |
We investigate the exclusive semileptonic and rare $D\to \pi(K)$ decays within the standard model together with the light-front quark model (LFQM) constrained by the variational principle for the QCD-motivated effective Hamiltonian. The form factors are obtained in the $q^+=0$ frame and then analytically continue to the physical timelike region. Together with our recent analysis of the current-component independent form factors $f_\pm(q^2)$ for the semileptonic decays, we present the current-component independent tensor form factor $f_T(q^2)$ for the rare decays to make the complete set of hadronic matrix elements regulating the semileptonic and rare $D\to\pi(K)$ decays in our LFQM. The tensor form factor $f_T(q^2)$ are obtained from two independent sets $(J^{+\perp}_T, J^{+-}_T)$ of the tensor current $J^{\mu\nu}_T$. As in our recent analysis of $f_-(q^2)$, we show that $f_T(q^2)$ obtained from the two different sets of the current components gives the identical result in the valence region of the $q^+=0$ frame without involving the explicit zero modes and the instantaneous contributions. The implications of the zero modes and the instantaneous contributions are also discussed in comparison between the manifestly covariant model and the standard LFQM. In our numerical calculations, we obtain the $q^2$-dependent form factors $(f_\pm, f_T)$ for $D\to\pi(K)$ and branching ratios for the semileptonic $D\to \pi(K)\ell\nu_\ell$ ($\ell=e,\mu$) decays. Our results show in good agreement with the available experimental data as well as other theoretical model predictions.
|
0710.0151
|
Eugene Golowich
|
E. Golowich
|
Charm Mixing - Theory
|
6 pages, to be published in the proceedings of CHARM07, Ithaca, NY,
August 2007, eConf C070805
|
ECONF C070805:05,2007
| null | null |
hep-ph
| null |
We discuss Standard Model (SM) and New Physics (NP) descriptions of D0
mixing. The SM part of the discussion addresses both quark level and hadron
level contributions. The NP part describes our recent works on the rate
difference Delta Gamma_D and the mass difference Delta M_D. In particular, we
describe how the recent experimental determination of Delta M_D is found to
place tightened restrictions on parameter spaces for 17 of 21 NP models
considered in a recent paper by Hewett, Pakvasa, Petrov and myself.
|
[
{
"created": "Sun, 30 Sep 2007 15:47:46 GMT",
"version": "v1"
}
] |
2011-06-15
|
[
[
"Golowich",
"E.",
""
]
] |
We discuss Standard Model (SM) and New Physics (NP) descriptions of D0 mixing. The SM part of the discussion addresses both quark level and hadron level contributions. The NP part describes our recent works on the rate difference Delta Gamma_D and the mass difference Delta M_D. In particular, we describe how the recent experimental determination of Delta M_D is found to place tightened restrictions on parameter spaces for 17 of 21 NP models considered in a recent paper by Hewett, Pakvasa, Petrov and myself.
|
hep-ph/9511279
|
Bohdan Grzadkowski
|
Bohdan Grzadkowski (Warsaw University)
|
Four-Fermi Effective Operators at e^+ e^- ---> \bar{t} t
|
LaTex, 10 pages, 4 PostScript figures (uuencoded)
|
Acta Phys.Polon. B27 (1996) 921-932
| null |
IFT 17/95
|
hep-ph
| null |
The process of top quark pair production at Next Linear Collider (NLC) has
been considered adopting an effective Lagrangian approach and including all
operators of dim~6 which can be tree-level-generated within unknown underlying
theory. All contributing helicity amplitudes are presented. It has been found
that four-fermion operators can provide the leading non-standard contribution
to the total cross section. Expected statistical significance of the
non-standard signal for the total cross section and forward-backward asymmetry
have been calculated taking into account existing experimental constraints. It
has been shown that adopting realistic luminosity of NLC and conservative
efficiency for the top-quark pair detection, the total cross section may be
sensitive to non-standard physics of an energy scale around $\Lambda=5\tev$.
|
[
{
"created": "Thu, 9 Nov 1995 15:25:46 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Grzadkowski",
"Bohdan",
"",
"Warsaw University"
]
] |
The process of top quark pair production at Next Linear Collider (NLC) has been considered adopting an effective Lagrangian approach and including all operators of dim~6 which can be tree-level-generated within unknown underlying theory. All contributing helicity amplitudes are presented. It has been found that four-fermion operators can provide the leading non-standard contribution to the total cross section. Expected statistical significance of the non-standard signal for the total cross section and forward-backward asymmetry have been calculated taking into account existing experimental constraints. It has been shown that adopting realistic luminosity of NLC and conservative efficiency for the top-quark pair detection, the total cross section may be sensitive to non-standard physics of an energy scale around $\Lambda=5\tev$.
|
hep-ph/9905434
|
Daniel de Florian
|
Daniel de Florian (Zurich, ETH)
|
Jet Production with Polarized Beams at Next-to-Leading Order
|
3 pages, 4 figures, talk given at the DIS99 Workshop, Zeuthen,
Germany, April 19-23, 1999
|
Nucl.Phys.Proc.Suppl. 79 (1999) 605-607
|
10.1016/S0920-5632(99)00796-3
|
ETH-TH/99-16
|
hep-ph
| null |
Jet production cross-sections in polarized proton-proton and electron-proton
collisions are studied to next-to-leading order accuracy. Phenomenological
results are presented for RHIC and HERA kinematics.
|
[
{
"created": "Fri, 21 May 1999 10:05:39 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"de Florian",
"Daniel",
"",
"Zurich, ETH"
]
] |
Jet production cross-sections in polarized proton-proton and electron-proton collisions are studied to next-to-leading order accuracy. Phenomenological results are presented for RHIC and HERA kinematics.
|
1811.12886
|
Ruben Sandapen
|
Mohammad Ahmady, Chandan Mondal and Ruben Sandapen
|
Dynamical spin effects within the pseudo scalar nonet within holographic
QCD
|
7 pages, 6 figures, Proceedings Contribution to the XIII Quark
Confinement and Hadron Spectrum Conference held at Maynooth University,
Ireland, from July 31 to August 6, 2018
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the importance of dynamical spin effects in the holographic
light-front wavefunctions of the pseudoscalar mesons. We find that these
effects are crucial to describe the pion data while they are not necessary to
describe the available kaon data. For $\eta-\eta^\prime$ system, we find that
dynamical spin effects are required to describe their transition form factors
data.
|
[
{
"created": "Fri, 30 Nov 2018 16:53:48 GMT",
"version": "v1"
}
] |
2018-12-03
|
[
[
"Ahmady",
"Mohammad",
""
],
[
"Mondal",
"Chandan",
""
],
[
"Sandapen",
"Ruben",
""
]
] |
We investigate the importance of dynamical spin effects in the holographic light-front wavefunctions of the pseudoscalar mesons. We find that these effects are crucial to describe the pion data while they are not necessary to describe the available kaon data. For $\eta-\eta^\prime$ system, we find that dynamical spin effects are required to describe their transition form factors data.
|
1004.0310
|
Cristina Volpe
|
R. Lazauskas and C. Volpe
|
Low energy neutrino scattering measurements at future Spallation Source
facilities
|
12 pages, 4 figures, 5 tables
|
J.Phys.G37:125101,2010
|
10.1088/0954-3899/37/12/125101
| null |
hep-ph astro-ph.SR nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the future several Spallation Source facilities will be available
worldwide. Spallation Sources produce large amount of neutrinos from
decay-at-rest muons and thus can be well adapted to accommodate
state-of-the-art neutrino experiments. In this paper low energy neutrino
scattering experiments that can be performed at such facilities are reviewed.
Estimation of expected event rates are given for several nuclei, electrons and
protons at a detector located close to the source. A neutrino program at
Spallation Sources comprises neutrino-nucleus cross section measurements
relevant for neutrino and core-collapse supernova physics, electroweak tests
and lepton-flavor violation searches.
|
[
{
"created": "Fri, 2 Apr 2010 09:58:14 GMT",
"version": "v1"
}
] |
2010-12-02
|
[
[
"Lazauskas",
"R.",
""
],
[
"Volpe",
"C.",
""
]
] |
In the future several Spallation Source facilities will be available worldwide. Spallation Sources produce large amount of neutrinos from decay-at-rest muons and thus can be well adapted to accommodate state-of-the-art neutrino experiments. In this paper low energy neutrino scattering experiments that can be performed at such facilities are reviewed. Estimation of expected event rates are given for several nuclei, electrons and protons at a detector located close to the source. A neutrino program at Spallation Sources comprises neutrino-nucleus cross section measurements relevant for neutrino and core-collapse supernova physics, electroweak tests and lepton-flavor violation searches.
|
1810.00099
|
Pia Zurita
|
Pia Zurita
|
Recent progress in Nuclear Parton Distributions
|
Talk presented CIPANP2018. 7 pages, LaTeX, 2 eps figures
| null | null |
CIPANP2018-Zurita
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The determination of the parton distribution functions (PDFs) is crucial for
a complete understanding of the protons and neutrons that make most of the
visible matter in the universe. Years of dedicated studies have yielded a quite
precise knowledge of the behavior of partons moving collinearly within a
proton. However Deep Inelastic Scattering (DIS) experiments off nuclei have
shown a non-trivial difference with respect to DIS in protons, hinting that the
partons in a nuclear medium do not behave the same way as in a free proton. In
this work we will discuss the latest results in nuclear parton distribution
functions (nPDFs) and how data from planned future experiments can help broaden
our understanding of the nPDFs.
|
[
{
"created": "Fri, 28 Sep 2018 21:57:24 GMT",
"version": "v1"
}
] |
2018-10-02
|
[
[
"Zurita",
"Pia",
""
]
] |
The determination of the parton distribution functions (PDFs) is crucial for a complete understanding of the protons and neutrons that make most of the visible matter in the universe. Years of dedicated studies have yielded a quite precise knowledge of the behavior of partons moving collinearly within a proton. However Deep Inelastic Scattering (DIS) experiments off nuclei have shown a non-trivial difference with respect to DIS in protons, hinting that the partons in a nuclear medium do not behave the same way as in a free proton. In this work we will discuss the latest results in nuclear parton distribution functions (nPDFs) and how data from planned future experiments can help broaden our understanding of the nPDFs.
|
1205.0753
|
Georgios Orfanidis
|
Nikos Irges, Georgios Orfanidis, George Zoupanos
|
Dimensional Reduction of N=1, E_8 SYM over SU(3)/U(1) x U(1) x Z_3 and
its four-dimensional effective action
|
Write-up for Proceedings of the 2011 Corfu Summer Institute on
Elementary Particle Physics and Gravity
| null | null | null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present an extension of the Standard Model inspired by the E_8 x E_8
Heterotic String. In order that a reasonable effective Lagrangian is presented
we neglect everything else other than the ten-dimensional N=1 supersymmetric
Yang-Mills sector associated with one of the gauge factors and certain
couplings necessary for anomaly cancellation. We consider a compactified
space-time M_4 x B_0 / Z_3, where B_0 is the nearly-Kaehler manifold SU(3)/U(1)
x U(1) and Z_3 is a freely acting discrete group on B_0. Then we reduce
dimensionally the E_8 on this manifold and we employ the Wilson flux mechanism
leading in four dimensions to an SU(3)^3 gauge theory with the spectrum of a
N=1 supersymmetric theory. We compute the effective four-dimensional Lagrangian
and demonstrate that an extension of the Standard Model is obtained with
interesting features including a conserved baryon number and fixed tree level
Yukawa couplings and scalar potential. The spectrum contains new states such as
right handed neutrinos and heavy vector-like quarks.
|
[
{
"created": "Thu, 3 May 2012 16:16:56 GMT",
"version": "v1"
},
{
"created": "Tue, 8 May 2012 12:11:36 GMT",
"version": "v2"
}
] |
2012-05-14
|
[
[
"Irges",
"Nikos",
""
],
[
"Orfanidis",
"Georgios",
""
],
[
"Zoupanos",
"George",
""
]
] |
We present an extension of the Standard Model inspired by the E_8 x E_8 Heterotic String. In order that a reasonable effective Lagrangian is presented we neglect everything else other than the ten-dimensional N=1 supersymmetric Yang-Mills sector associated with one of the gauge factors and certain couplings necessary for anomaly cancellation. We consider a compactified space-time M_4 x B_0 / Z_3, where B_0 is the nearly-Kaehler manifold SU(3)/U(1) x U(1) and Z_3 is a freely acting discrete group on B_0. Then we reduce dimensionally the E_8 on this manifold and we employ the Wilson flux mechanism leading in four dimensions to an SU(3)^3 gauge theory with the spectrum of a N=1 supersymmetric theory. We compute the effective four-dimensional Lagrangian and demonstrate that an extension of the Standard Model is obtained with interesting features including a conserved baryon number and fixed tree level Yukawa couplings and scalar potential. The spectrum contains new states such as right handed neutrinos and heavy vector-like quarks.
|
0801.0529
|
Sandy Donnachie
|
A Donnachie and Yu S Kalashnikova
|
Scalar Meson Photoproduction
|
Talk given at HADRON07, Frascati
| null | null | null |
hep-ph
| null |
The scalar mesons f0(1370), f0(1500) and f0(1710) are of interest as there is
as yet no consensus of their status, or indeed of the existence of the
f0(1370). Radiative decays to rho and omega have been shown to provide
effective probes of their structure and to discriminate among models.
Scalar-meson photoproduction is proposed as an alternative and it is shown that
it represents a feasible approach.
|
[
{
"created": "Thu, 3 Jan 2008 14:30:09 GMT",
"version": "v1"
}
] |
2008-01-04
|
[
[
"Donnachie",
"A",
""
],
[
"Kalashnikova",
"Yu S",
""
]
] |
The scalar mesons f0(1370), f0(1500) and f0(1710) are of interest as there is as yet no consensus of their status, or indeed of the existence of the f0(1370). Radiative decays to rho and omega have been shown to provide effective probes of their structure and to discriminate among models. Scalar-meson photoproduction is proposed as an alternative and it is shown that it represents a feasible approach.
|
0802.4171
|
A. D. Polosa
|
M. Moretti, F. Piccinini, A.D. Polosa
|
A Fully Numerical Approach to One-Loop Amplitudes
|
31 pages, revised and enlarged manuscript, axodraw.sty needed
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We suggest a new approach for the automatic and fully numerical evaluation of
one-loop scattering amplitudes in perturbative quantum field theory. We use
suitably formulated dispersion relations to perform the calculation as a
convolution of tree-level amplitudes. This allows to take advantage of the
iterative numerical algorithms for the evaluation of leading order matrix
elements.
|
[
{
"created": "Thu, 28 Feb 2008 11:31:20 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Sep 2008 15:45:34 GMT",
"version": "v2"
}
] |
2008-09-29
|
[
[
"Moretti",
"M.",
""
],
[
"Piccinini",
"F.",
""
],
[
"Polosa",
"A. D.",
""
]
] |
We suggest a new approach for the automatic and fully numerical evaluation of one-loop scattering amplitudes in perturbative quantum field theory. We use suitably formulated dispersion relations to perform the calculation as a convolution of tree-level amplitudes. This allows to take advantage of the iterative numerical algorithms for the evaluation of leading order matrix elements.
|
2203.14443
|
Tong Li
|
Tong Li, Jiajun Liao
|
Electron-target experiment constraints on light dark matter produced in
primordial black hole evaporation
|
7 pages, 4 figures, 1 table. Version accepted for publication in PRD.
arXiv admin note: text overlap with arXiv:2108.05608
| null |
10.1103/PhysRevD.106.055043
| null |
hep-ph astro-ph.CO hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
Light sub-GeV dark matter (DM) particles in the Milky Way or macroscopic
objects such as primordial black holes (PBHs) become attractive DM candidates
due to null results of WIMP from direct detection experiments. We explore the
possibility in which the present PBHs play as a novel source to produce light
boosted DM and confine light PBHs with current and future terrestrial
facilities. We study the electron elastic scattering data and obtain the
current constraints from Super-Kamiokande and XENON1T on the boosted DM from
PBH evaporation. The prospective bounds on the sub-GeV DM-electron scattering
cross section and the fraction of DM composed of PBHs $f_{\rm PBH}$ are also
imposed for future Xenon experiments.
|
[
{
"created": "Mon, 28 Mar 2022 01:48:45 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Sep 2022 13:09:03 GMT",
"version": "v2"
}
] |
2022-10-12
|
[
[
"Li",
"Tong",
""
],
[
"Liao",
"Jiajun",
""
]
] |
Light sub-GeV dark matter (DM) particles in the Milky Way or macroscopic objects such as primordial black holes (PBHs) become attractive DM candidates due to null results of WIMP from direct detection experiments. We explore the possibility in which the present PBHs play as a novel source to produce light boosted DM and confine light PBHs with current and future terrestrial facilities. We study the electron elastic scattering data and obtain the current constraints from Super-Kamiokande and XENON1T on the boosted DM from PBH evaporation. The prospective bounds on the sub-GeV DM-electron scattering cross section and the fraction of DM composed of PBHs $f_{\rm PBH}$ are also imposed for future Xenon experiments.
|
1708.04641
|
Xiaohui Liu
|
Xiaohui Liu, Sven-Olaf Moch and Felix Ringer
|
Threshold and jet radius joint resummation for single-inclusive jet
production
|
5 pages, 3 figures, minor text changes, PDF uncertainties included
and more references added. Replaced to match the published version
|
Phys. Rev. Lett. 119, 212001 (2017)
|
10.1103/PhysRevLett.119.212001
|
DESY 17-119
|
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the first threshold and jet radius jointly resummed cross section
for single-inclusive hadronic jet production. We work at next-to-leading
logarithmic accuracy and our framework allows for a systematic extension beyond
the currently achieved precision. Longstanding numerical issues are overcome by
performing the resummation directly in momentum space within Soft Collinear
Effective Theory. We present the first numerical results for the LHC and
observe an improved description of the available data. Our results are of
immediate relevance for LHC precision phenomenology including the extraction of
parton distribution functions and the QCD strong coupling constant.
|
[
{
"created": "Tue, 15 Aug 2017 18:49:24 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Aug 2017 19:59:12 GMT",
"version": "v2"
},
{
"created": "Wed, 18 Oct 2017 23:57:03 GMT",
"version": "v3"
},
{
"created": "Tue, 28 Nov 2017 17:20:33 GMT",
"version": "v4"
}
] |
2017-11-29
|
[
[
"Liu",
"Xiaohui",
""
],
[
"Moch",
"Sven-Olaf",
""
],
[
"Ringer",
"Felix",
""
]
] |
We present the first threshold and jet radius jointly resummed cross section for single-inclusive hadronic jet production. We work at next-to-leading logarithmic accuracy and our framework allows for a systematic extension beyond the currently achieved precision. Longstanding numerical issues are overcome by performing the resummation directly in momentum space within Soft Collinear Effective Theory. We present the first numerical results for the LHC and observe an improved description of the available data. Our results are of immediate relevance for LHC precision phenomenology including the extraction of parton distribution functions and the QCD strong coupling constant.
|
1006.1688
|
Koichi Yoshioka
|
Shigeki Matsumoto and Koichi Yoshioka
|
Deep Correlation Between Cosmic-Ray Anomaly and Neutrino Masses
|
12 pages
|
Phys.Rev.D82:053009,2010
|
10.1103/PhysRevD.82.053009
|
UT-HET 040, KUNS-2271
|
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The positron anomaly recently reported by the cosmic-ray measurements
suggests that, if explained by the decay of dark matter particle, the decay
source is closely linked up with the leptonic sector of the standard model. It
is observed that, with a simple dimensional analysis, the lifetime of dark
matter for the anomaly is expressed by the energy scale of neutrino masses. We
present two scenarios in which these two matter at issue (the dark matter width
and the tiny neutrino masses) stem from a single operator involving a
gauge-singlet scalar field.
|
[
{
"created": "Wed, 9 Jun 2010 02:35:36 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Sep 2010 06:33:46 GMT",
"version": "v2"
}
] |
2014-11-21
|
[
[
"Matsumoto",
"Shigeki",
""
],
[
"Yoshioka",
"Koichi",
""
]
] |
The positron anomaly recently reported by the cosmic-ray measurements suggests that, if explained by the decay of dark matter particle, the decay source is closely linked up with the leptonic sector of the standard model. It is observed that, with a simple dimensional analysis, the lifetime of dark matter for the anomaly is expressed by the energy scale of neutrino masses. We present two scenarios in which these two matter at issue (the dark matter width and the tiny neutrino masses) stem from a single operator involving a gauge-singlet scalar field.
|
2105.05257
|
Stefan Bi{\ss}mann
|
Stefan Bi{\ss}mann, Cornelius Grunwald, Gudrun Hiller, Kevin
Kr\"oninger
|
Synergies of top and $B$ anomalies in SMEFT
|
4 pages, 2 figures, contribution to the "2021 Electroweak session of
the 55th Rencontres de Moriond"
| null | null |
DO-TH 21/15
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present constraints on Wilson coefficients from a combined fit to data
from top-quark and beauty-physics measurements within the Standard Model
effective field theory. We consider present data on top-quark pair production
and decay, $b\to s$ flavor changing neutral currents, and $Z\to b\bar b$ decay,
as well as different future scenarios. These comprise projections for HL-LHC,
Belle II, and a lepton collider using the example of CLIC. We investigate
opportunities for detecting deviations from the Standard Model hinted at by
present data on $b\to s$ transitions. In the fit, we find strong synergies
between top-quark and beauty physics that allow to tighten constraints on
various coefficients.
|
[
{
"created": "Tue, 11 May 2021 18:00:01 GMT",
"version": "v1"
}
] |
2021-05-13
|
[
[
"Bißmann",
"Stefan",
""
],
[
"Grunwald",
"Cornelius",
""
],
[
"Hiller",
"Gudrun",
""
],
[
"Kröninger",
"Kevin",
""
]
] |
We present constraints on Wilson coefficients from a combined fit to data from top-quark and beauty-physics measurements within the Standard Model effective field theory. We consider present data on top-quark pair production and decay, $b\to s$ flavor changing neutral currents, and $Z\to b\bar b$ decay, as well as different future scenarios. These comprise projections for HL-LHC, Belle II, and a lepton collider using the example of CLIC. We investigate opportunities for detecting deviations from the Standard Model hinted at by present data on $b\to s$ transitions. In the fit, we find strong synergies between top-quark and beauty physics that allow to tighten constraints on various coefficients.
|
hep-ph/0101349
|
Tomas Blazek
|
Gregory W. Anderson, Tomas Blazek
|
E_6 unification model building III. Clebsch-Gordan coefficients in E_6
tensor products of the 27 with higher dimensional representations
|
44 pages, 31 tables
| null | null |
NUHEP-TH-00-81, SHEP-01-05
|
hep-ph
| null |
$E_6$ is an attractive group for unification model building. However, the
complexity of a rank 6 group makes it non-trivial to write down the structure
of higher dimensional operators in an $E_6$ theory in terms of the states
labeled by quantum numbers of the Standard Model gauge group. In this paper, we
show the results of our computation of the Clebsch-Gordan coefficients for the
products of the {\bf 27} with irreducible representations of higher
dimensionality: ${\bf 78}$, ${\bf 351}$, ${\bf 351^\prime}$, ${\bf \ol{351}}$,
and ${\bf \ol{351^\prime}}$. Application of these results to $E_6$ model
building involving higher dimensional operators is straightforward.
|
[
{
"created": "Wed, 31 Jan 2001 15:24:58 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Anderson",
"Gregory W.",
""
],
[
"Blazek",
"Tomas",
""
]
] |
$E_6$ is an attractive group for unification model building. However, the complexity of a rank 6 group makes it non-trivial to write down the structure of higher dimensional operators in an $E_6$ theory in terms of the states labeled by quantum numbers of the Standard Model gauge group. In this paper, we show the results of our computation of the Clebsch-Gordan coefficients for the products of the {\bf 27} with irreducible representations of higher dimensionality: ${\bf 78}$, ${\bf 351}$, ${\bf 351^\prime}$, ${\bf \ol{351}}$, and ${\bf \ol{351^\prime}}$. Application of these results to $E_6$ model building involving higher dimensional operators is straightforward.
|
2407.12071
|
Eva Los
|
E. E. Los, E. Gerstmayr, C. Arran, M. J. V. Streeter, C. Colgan, C. C.
Cobo, B. Kettle, T. G. Blackburn, N. Bourgeois, L. Calvin, J. Carderelli, N.
Cavanagh, S.J.D. Dann A. Di Piazza, R. Fitzgarrald, A. Ilderton, C. H.
Keitel, M. Marklund, P. McKenna, C. D. Murphy, Z. Najmudin, P. Parsons, P. P.
Rajeev, D. R. Symes, M. Tamburini, A. G. R. Thomas, J. C. Wood, M. Zepf, G.
Sarri, C. P. Ridgers, S. P. D Mangles
|
Observation of quantum effects on radiation reaction in strong fields
|
31 pages, 14 figures
| null | null | null |
hep-ph physics.plasm-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Radiation reaction describes the effective force experienced by an
accelerated charge due to radiation emission. Quantum effects dominate charge
dynamics and radiation production[1][2] for charges accelerated by fields with
strengths approaching the Schwinger field,
$\mathbf{E_{sch}=}$\textbf{\SI[detect-weight]{1.3e18}{\volt\per\metre}[3]. Such
fields exist in extreme astrophysical environments such as pulsar
magnetospheres[4], may be accessed by high-power laser systems[5-7], dense
particle beams interacting with plasma[8], crystals[9], and at the interaction
point of next generation particle colliders[10]. Classical radiation reaction
theories do not limit the frequency of radiation emitted by accelerating
charges and omit stochastic effects inherent in photon emission[11], thus
demanding a quantum treatment. Two quantum radiation reaction models, the
quantum-continuous[12] and quantum-stochastic[13] models, correct the former
issue, while only the quantum-stochastic model incorporates stochasticity[12].
Such models are of fundamental importance, providing insight into the effect of
the electron self-force on its dynamics in electromagnetic fields. The
difficulty of accessing conditions where quantum effects dominate inhibited
previous efforts to observe quantum radiation reaction in charged particle
dynamics with high significance. We report the first direct, high significance
$(>5{\sigma})$ observation of strong-field radiation reaction on charged
particles. Furthermore, we obtain strong evidence favouring the quantum
radiation reaction models, which perform equivalently, over the classical
model. Robust model comparison was facilitated by a novel Bayesian framework
which inferred collision parameters. This framework has widespread utility for
experiments where parameters governing lepton-laser collisions cannot be
directly measured, including those using conventional accelerators.
|
[
{
"created": "Tue, 16 Jul 2024 12:53:04 GMT",
"version": "v1"
}
] |
2024-07-18
|
[
[
"Los",
"E. E.",
""
],
[
"Gerstmayr",
"E.",
""
],
[
"Arran",
"C.",
""
],
[
"Streeter",
"M. J. V.",
""
],
[
"Colgan",
"C.",
""
],
[
"Cobo",
"C. C.",
""
],
[
"Kettle",
"B.",
""
],
[
"Blackburn",
"T. G.",
""
],
[
"Bourgeois",
"N.",
""
],
[
"Calvin",
"L.",
""
],
[
"Carderelli",
"J.",
""
],
[
"Cavanagh",
"N.",
""
],
[
"Di Piazza",
"S. J. D. Dann A.",
""
],
[
"Fitzgarrald",
"R.",
""
],
[
"Ilderton",
"A.",
""
],
[
"Keitel",
"C. H.",
""
],
[
"Marklund",
"M.",
""
],
[
"McKenna",
"P.",
""
],
[
"Murphy",
"C. D.",
""
],
[
"Najmudin",
"Z.",
""
],
[
"Parsons",
"P.",
""
],
[
"Rajeev",
"P. P.",
""
],
[
"Symes",
"D. R.",
""
],
[
"Tamburini",
"M.",
""
],
[
"Thomas",
"A. G. R.",
""
],
[
"Wood",
"J. C.",
""
],
[
"Zepf",
"M.",
""
],
[
"Sarri",
"G.",
""
],
[
"Ridgers",
"C. P.",
""
],
[
"Mangles",
"S. P. D",
""
]
] |
Radiation reaction describes the effective force experienced by an accelerated charge due to radiation emission. Quantum effects dominate charge dynamics and radiation production[1][2] for charges accelerated by fields with strengths approaching the Schwinger field, $\mathbf{E_{sch}=}$\textbf{\SI[detect-weight]{1.3e18}{\volt\per\metre}[3]. Such fields exist in extreme astrophysical environments such as pulsar magnetospheres[4], may be accessed by high-power laser systems[5-7], dense particle beams interacting with plasma[8], crystals[9], and at the interaction point of next generation particle colliders[10]. Classical radiation reaction theories do not limit the frequency of radiation emitted by accelerating charges and omit stochastic effects inherent in photon emission[11], thus demanding a quantum treatment. Two quantum radiation reaction models, the quantum-continuous[12] and quantum-stochastic[13] models, correct the former issue, while only the quantum-stochastic model incorporates stochasticity[12]. Such models are of fundamental importance, providing insight into the effect of the electron self-force on its dynamics in electromagnetic fields. The difficulty of accessing conditions where quantum effects dominate inhibited previous efforts to observe quantum radiation reaction in charged particle dynamics with high significance. We report the first direct, high significance $(>5{\sigma})$ observation of strong-field radiation reaction on charged particles. Furthermore, we obtain strong evidence favouring the quantum radiation reaction models, which perform equivalently, over the classical model. Robust model comparison was facilitated by a novel Bayesian framework which inferred collision parameters. This framework has widespread utility for experiments where parameters governing lepton-laser collisions cannot be directly measured, including those using conventional accelerators.
|
1904.08354
|
Mathew Thomas Mr.
|
Mathew Thomas Arun
|
Relaxing the $W'$ constraint on compactified extra-dimension
|
12 pages, 1 figure
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It has been known for some time that the inclusion of brane fluctuations,
namely branons, helps in the suppression of KK-mode couplings to brane
localised matter fields. In this paper we study the constraint on brane tension
and compactification scale for such models using the results from the direct
search of $W'$ at 13 TeV LHC, with an integrated luminosity of $36.1 fb^{-1}$,
in the case for which branon forms the entire cold dark matter. Unlike the
rigid brane scenario, where the compactification scale gets constrained to
$\frac{1}{R} \gtrsim 5.2$ TeV, here we show that compactification scales as
small as $\sim 1$ TeV are allowed for brane tensions of similar strength.
|
[
{
"created": "Wed, 17 Apr 2019 16:39:58 GMT",
"version": "v1"
}
] |
2019-04-18
|
[
[
"Arun",
"Mathew Thomas",
""
]
] |
It has been known for some time that the inclusion of brane fluctuations, namely branons, helps in the suppression of KK-mode couplings to brane localised matter fields. In this paper we study the constraint on brane tension and compactification scale for such models using the results from the direct search of $W'$ at 13 TeV LHC, with an integrated luminosity of $36.1 fb^{-1}$, in the case for which branon forms the entire cold dark matter. Unlike the rigid brane scenario, where the compactification scale gets constrained to $\frac{1}{R} \gtrsim 5.2$ TeV, here we show that compactification scales as small as $\sim 1$ TeV are allowed for brane tensions of similar strength.
|
2104.08750
|
Alexander S. Sakharov
|
Alexander S. Sakharov, Yury N. Eroshenko, Sergey G. Rubin
|
Looking at the NANOGrav Signal Through the Anthropic Window of
Axion-Like Particles
|
39 pages, 3 figures, the version accepted for publication in Physical
Review D
|
Phys. Rev. D 104, 043005 (2021)
|
10.1103/PhysRevD.104.043005
| null |
hep-ph astro-ph.CO gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We explore the inflationary dynamics leading to formation of closed domain
walls in course of evolution of an axion like particle (ALP) field whose
Peccei-Quinn-like phase transition occurred well before inflationary epoch.
Evolving after inflation, the domain walls may leave their imprint in
stochastic gravitational waves background, in the frequency range accessible
for the pulsar timing array measurements. We derive the characteristic strain
power spectrum produced by the distribution of the closed domain walls and
relate it with the recently reported NANOGrav signal excess. We found that the
slope of the frequency dependence of the characteristic strain spectrum
generated by the domain walls is very well centered inside the range of the
slopes in the signal reported by the NANOGrav. Analyzing the inflationary
dynamics of the ALP field, in consistency with the isocurvature constraint, we
revealed those combinations of the parameters where the signal from the
inflationary induced ALPs domain walls could saturate the amplitude of the
NANOGrav excess. The evolution of big enough closed domain walls may incur in
formation of wormholes with the walls escaping into baby universes. We studied
the conditions, when closed walls escaped into baby universes could leave a
detectable imprint in the stochastic gravitational waves background.
|
[
{
"created": "Sun, 18 Apr 2021 07:22:06 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Jun 2021 21:35:12 GMT",
"version": "v2"
}
] |
2021-08-11
|
[
[
"Sakharov",
"Alexander S.",
""
],
[
"Eroshenko",
"Yury N.",
""
],
[
"Rubin",
"Sergey G.",
""
]
] |
We explore the inflationary dynamics leading to formation of closed domain walls in course of evolution of an axion like particle (ALP) field whose Peccei-Quinn-like phase transition occurred well before inflationary epoch. Evolving after inflation, the domain walls may leave their imprint in stochastic gravitational waves background, in the frequency range accessible for the pulsar timing array measurements. We derive the characteristic strain power spectrum produced by the distribution of the closed domain walls and relate it with the recently reported NANOGrav signal excess. We found that the slope of the frequency dependence of the characteristic strain spectrum generated by the domain walls is very well centered inside the range of the slopes in the signal reported by the NANOGrav. Analyzing the inflationary dynamics of the ALP field, in consistency with the isocurvature constraint, we revealed those combinations of the parameters where the signal from the inflationary induced ALPs domain walls could saturate the amplitude of the NANOGrav excess. The evolution of big enough closed domain walls may incur in formation of wormholes with the walls escaping into baby universes. We studied the conditions, when closed walls escaped into baby universes could leave a detectable imprint in the stochastic gravitational waves background.
|
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