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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1206.2634
|
Andreas Crivellin
|
Andreas Crivellin, Christoph Greub and Ahmet Kokulu
|
Explaining B->D\tau\nu, B->D*\tau\nu and B->\tau\nu in a 2HDM of type
III
|
5 pages, 3 figures, version accepted for publication in PRD
|
Phys. Rev. D 86, 054014 (2012)
|
10.1103/PhysRevD.86.054014
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently, the BaBar collaboration reported first evidence for new physics in
B->D\tau\nu and B->D*\tau\nu. Combining both processes the significance is
3.4\sigma. This result cannot be explained in a two Higgs doublet model of type
II. Furthermore, the CKMfitter group finds a 2.9\sigma discrepancy between the
Standard Model prediction for Br[B->\tau\nu] (using Vub from a global fit to
the unitary triangle) and the measurements of the B factories. Altogether,
these measurements are strong indications for physics beyond the SM in B meson
decays to taus.
We show that in a two Higgs doublet model of type III it is possible to
simultaneously explain \bdtau and \bdstau using a single free parameter
\epsilon^u_32. Also Br[B->\tau\nu] can be brought into agreement with
experiment using \epsilon^u_31. Furthermore, for Higgs (A^0, H^0, H^+) masses
around 500 GeV, as suggested by recent CMS results, all bounds from FCNC
processes are satisfied and B->D\tau\nu, B->D*\tau\nu and B->\tau\nu can be
explained without a significant degree of fine-tuning.
|
[
{
"created": "Tue, 12 Jun 2012 19:57:45 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Sep 2012 11:36:10 GMT",
"version": "v2"
}
] |
2013-09-04
|
[
[
"Crivellin",
"Andreas",
""
],
[
"Greub",
"Christoph",
""
],
[
"Kokulu",
"Ahmet",
""
]
] |
Recently, the BaBar collaboration reported first evidence for new physics in B->D\tau\nu and B->D*\tau\nu. Combining both processes the significance is 3.4\sigma. This result cannot be explained in a two Higgs doublet model of type II. Furthermore, the CKMfitter group finds a 2.9\sigma discrepancy between the Standard Model prediction for Br[B->\tau\nu] (using Vub from a global fit to the unitary triangle) and the measurements of the B factories. Altogether, these measurements are strong indications for physics beyond the SM in B meson decays to taus. We show that in a two Higgs doublet model of type III it is possible to simultaneously explain \bdtau and \bdstau using a single free parameter \epsilon^u_32. Also Br[B->\tau\nu] can be brought into agreement with experiment using \epsilon^u_31. Furthermore, for Higgs (A^0, H^0, H^+) masses around 500 GeV, as suggested by recent CMS results, all bounds from FCNC processes are satisfied and B->D\tau\nu, B->D*\tau\nu and B->\tau\nu can be explained without a significant degree of fine-tuning.
|
hep-ph/9405430
|
David Summers
|
D.J. Summers
|
Exponentiation of soft photons in a process involving hard photons
|
27 pages + 8 figures, plain TeX. Major changes from original
submission. Available from
ftp://phenom.physics.wisc.edu/pub/preprints/1995/madph-95-833.ps.Z
|
Phys.Rev.D53:2430-2441,1996
|
10.1103/PhysRevD.53.2430
|
MAD/PH/833
|
hep-ph
| null |
We present a simple method of removing the singularities associated with soft
photon emission to all orders in perturbation theory through exponentiation,
while keeping a consistent description of hard photon emission. We apply this
method to the process e+ e- --> mu+ mu- + n photons where we include both Z^0
and photon exchange and retain the muon mass dependence. The photonic radiation
is allowed to be radiated off any charged leg, and so we include all initial
and final state radiation, as well as all interference effects. The effect of
exponentiation is to suppress soft photon emission over the cross-section you
would obtain from working at strictly leading order. We also show how one would
extend the method to treat the collinear singularity; and remove the associated
leading mass logarithms.
|
[
{
"created": "Wed, 1 Jun 1994 03:52:50 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Feb 1995 20:54:45 GMT",
"version": "v2"
}
] |
2011-07-19
|
[
[
"Summers",
"D. J.",
""
]
] |
We present a simple method of removing the singularities associated with soft photon emission to all orders in perturbation theory through exponentiation, while keeping a consistent description of hard photon emission. We apply this method to the process e+ e- --> mu+ mu- + n photons where we include both Z^0 and photon exchange and retain the muon mass dependence. The photonic radiation is allowed to be radiated off any charged leg, and so we include all initial and final state radiation, as well as all interference effects. The effect of exponentiation is to suppress soft photon emission over the cross-section you would obtain from working at strictly leading order. We also show how one would extend the method to treat the collinear singularity; and remove the associated leading mass logarithms.
|
1704.04085
|
Mureed Hussain
|
Mureed Hussain and Rizwan Khalid
|
Understanding the muon anomalous magnetic moment in light of a flavor
symmetry-based Minimal Supersymmetric Standard Model
|
16 pages, 9 figures, 1 table
|
Prog Theor Exp Phys (2018)
|
10.1093/ptep/pty087
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate whether the Minimal Supersymmetric Standard Model with the
scalar masses of the third generation distinct from the first two, in order to
be able to accommodate the muon anomalous magnetic moment, is consistent with
the latest results from LHCb, direct collider bounds from the ATLAS and CMS
experiments. In particular, we show that this class of models allows for
satisfying both the constraints from the muon $(g-2)_\mu$ experiment and
various bounds from the LHC. In addition, such models can also explain the
observed dark matter relic density.
|
[
{
"created": "Thu, 13 Apr 2017 12:13:33 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Apr 2018 13:00:24 GMT",
"version": "v2"
}
] |
2019-12-06
|
[
[
"Hussain",
"Mureed",
""
],
[
"Khalid",
"Rizwan",
""
]
] |
We investigate whether the Minimal Supersymmetric Standard Model with the scalar masses of the third generation distinct from the first two, in order to be able to accommodate the muon anomalous magnetic moment, is consistent with the latest results from LHCb, direct collider bounds from the ATLAS and CMS experiments. In particular, we show that this class of models allows for satisfying both the constraints from the muon $(g-2)_\mu$ experiment and various bounds from the LHC. In addition, such models can also explain the observed dark matter relic density.
|
1007.4573
|
Luca Vecchi
|
Luca Vecchi
|
Technicolor at Criticality
|
21 pages, 2 figures, version published in JHEP
|
JHEP 1104:127,2011
|
10.1007/JHEP04(2011)127
|
LA-UR 10-04036
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose an asymptotically non-free, natural model for dynamical
electro-weak symmetry breaking characterized by the emergence of a weakly
coupled Higgs in the IR regime. Due to the large anomalous dimension of the
Higgs operator, the model is capable of solving the hierarchy problem without
losing the phenomenologically appealing features typical of a weakly coupled
sector. We speculate on the possibility that such a scenario be realized as a
strongly coupled phase of non-supersymmetric non-abelian gauge theories.
|
[
{
"created": "Mon, 26 Jul 2010 21:18:09 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Apr 2011 20:19:05 GMT",
"version": "v2"
}
] |
2011-05-09
|
[
[
"Vecchi",
"Luca",
""
]
] |
We propose an asymptotically non-free, natural model for dynamical electro-weak symmetry breaking characterized by the emergence of a weakly coupled Higgs in the IR regime. Due to the large anomalous dimension of the Higgs operator, the model is capable of solving the hierarchy problem without losing the phenomenologically appealing features typical of a weakly coupled sector. We speculate on the possibility that such a scenario be realized as a strongly coupled phase of non-supersymmetric non-abelian gauge theories.
|
2112.03187
|
Muhammad Ajaz
|
Muhammad Ajaz, Muhammad Waqas, Guang-Xiong Peng, Zafar Yasin, Hannan
Younis and Abd Al Karim Haj Ismai l
|
Study of pT spectra of light particles using modified Hagedorn function
and cosmic rays Monte Carlo event generators in proton-proton collisions at
900 GeV center of mass energy
|
7 pages, 3 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Transverse momentum spectra of charged particles including pions, kaons and
(anti-)protons measured by ALICE experiment in the pT range of 0.1-2.5 GeV/c
and pseudorapidity less than 0.5 are studied in pp collisions at 900 GeV center
of mass energy using modified Hagedorn function with embedded transverse flow
velocity and are compared to the predictions of EPOS-LHC, Pythia, QGSJET and
Sibyll models. We find that the average transverse flow velocity decreases with
increasing the mass of the particle while the kinetic freeze-out temperature
extracted from the function increases with the particle's mass. The former
varies from 0.36 c to 0.25 c for pions to protons while the latter from 76 MeV
to 95 MeV respectively. The fit of the models predictions also yield the same
values for T0 and beta as the experimental data. The only difference is in the
values of n, and N0 which yields different values for different models. The
EPOS-LHC, Pythia, and QGSJET models reproduce the data in most of the pT range
for pions, EPOS-LHC and Sibyll for kaons up to 1.5 GeV/c and EPOS-LHC for
protons up to 1.6 GeV/c. The model simulations also reproduced the behavior of
increasing average transverse momentum with mass reported by the ALICE
experiment.
|
[
{
"created": "Mon, 6 Dec 2021 17:37:28 GMT",
"version": "v1"
}
] |
2021-12-07
|
[
[
"Ajaz",
"Muhammad",
""
],
[
"Waqas",
"Muhammad",
""
],
[
"Peng",
"Guang-Xiong",
""
],
[
"Yasin",
"Zafar",
""
],
[
"Younis",
"Hannan",
""
],
[
"l",
"Abd Al Karim Haj Ismai",
""
]
] |
Transverse momentum spectra of charged particles including pions, kaons and (anti-)protons measured by ALICE experiment in the pT range of 0.1-2.5 GeV/c and pseudorapidity less than 0.5 are studied in pp collisions at 900 GeV center of mass energy using modified Hagedorn function with embedded transverse flow velocity and are compared to the predictions of EPOS-LHC, Pythia, QGSJET and Sibyll models. We find that the average transverse flow velocity decreases with increasing the mass of the particle while the kinetic freeze-out temperature extracted from the function increases with the particle's mass. The former varies from 0.36 c to 0.25 c for pions to protons while the latter from 76 MeV to 95 MeV respectively. The fit of the models predictions also yield the same values for T0 and beta as the experimental data. The only difference is in the values of n, and N0 which yields different values for different models. The EPOS-LHC, Pythia, and QGSJET models reproduce the data in most of the pT range for pions, EPOS-LHC and Sibyll for kaons up to 1.5 GeV/c and EPOS-LHC for protons up to 1.6 GeV/c. The model simulations also reproduced the behavior of increasing average transverse momentum with mass reported by the ALICE experiment.
|
1209.3259
|
Roberto Franceschini
|
Zackaria Chacko, Roberto Franceschini, Rashmish K. Mishra
|
Resonance at 125 GeV: Higgs or Dilaton/Radion?
|
41 pages, 4 figures. Analysis updated using current theoretical
limits on dimensions of CFT operators. References added. Version to appear on
JHEP
| null |
10.1007/JHEP04(2013)015
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the possibility that the new particle that has been observed at
125 GeV is not the Standard Model (SM) Higgs, but instead the dilaton
associated with an approximate conformal symmetry that has been spontaneously
broken. We focus on dilatons that arise from theories of technicolor, or from
theories of the Higgs as a pseudo-Nambu-Goldstone boson (pNGB), that involve
strong conformal dynamics in the ultraviolet. In the pNGB case, we are
considering a framework where the Higgs particle is significantly heavier than
the dilaton and has therefore not yet been observed. In each of the technicolor
and pNGB scenarios, we study both the case when the SM fermions and gauge
bosons are elementary, and the case when they are composites of the strongly
interacting sector. Our analysis incorporates conformal symmetry violating
effects, which are necessarily present since the dilaton is not massless, and
is directly applicable to a broad class of models that stabilize the weak scale
and involve strong conformal dynamics. Since the AdS/CFT correspondence relates
the radion in Randall-Sundrum (RS) models to the dilaton, our results also
apply to RS models with the SM fields localized on the infrared brane, or in
the bulk. We identify the parameters that can be used to distinguish the
dilatons associated with the several different classes of theories being
considered from each other, and from the SM Higgs. We perform a fit to all the
available data from several experiments and highlight the key observations to
extract these parameters. We find that at present, both the technicolor and
pNGB dilaton scenarios provide a good fit to the data, comparable to the SM
Higgs. We indicate the future observations that will help to corroborate or
falsify each scenario.
|
[
{
"created": "Fri, 14 Sep 2012 16:54:00 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Apr 2013 20:17:13 GMT",
"version": "v2"
}
] |
2015-06-11
|
[
[
"Chacko",
"Zackaria",
""
],
[
"Franceschini",
"Roberto",
""
],
[
"Mishra",
"Rashmish K.",
""
]
] |
We consider the possibility that the new particle that has been observed at 125 GeV is not the Standard Model (SM) Higgs, but instead the dilaton associated with an approximate conformal symmetry that has been spontaneously broken. We focus on dilatons that arise from theories of technicolor, or from theories of the Higgs as a pseudo-Nambu-Goldstone boson (pNGB), that involve strong conformal dynamics in the ultraviolet. In the pNGB case, we are considering a framework where the Higgs particle is significantly heavier than the dilaton and has therefore not yet been observed. In each of the technicolor and pNGB scenarios, we study both the case when the SM fermions and gauge bosons are elementary, and the case when they are composites of the strongly interacting sector. Our analysis incorporates conformal symmetry violating effects, which are necessarily present since the dilaton is not massless, and is directly applicable to a broad class of models that stabilize the weak scale and involve strong conformal dynamics. Since the AdS/CFT correspondence relates the radion in Randall-Sundrum (RS) models to the dilaton, our results also apply to RS models with the SM fields localized on the infrared brane, or in the bulk. We identify the parameters that can be used to distinguish the dilatons associated with the several different classes of theories being considered from each other, and from the SM Higgs. We perform a fit to all the available data from several experiments and highlight the key observations to extract these parameters. We find that at present, both the technicolor and pNGB dilaton scenarios provide a good fit to the data, comparable to the SM Higgs. We indicate the future observations that will help to corroborate or falsify each scenario.
|
hep-ph/9704210
|
John Costella
|
John P. Costella, Bruce H. J. McKellar, and Andrew A. Rawlinson
|
Classical antiparticles
|
14 pages, standard LaTeX, no figures, no macros. To be published in
the American Journal of Physics. Ref [1] is archived here as hep-ph/9503416
|
Am.J.Phys.65:835-841,1997
|
10.1119/1.18669
|
UM-P-97/19
|
hep-ph
| null |
We review how antiparticles may be introduced in classical relativistic
mechanics, and emphasize that many of their paradoxical properties can be more
transparently understood in the classical than in the quantum domain.
|
[
{
"created": "Wed, 2 Apr 1997 05:13:57 GMT",
"version": "v1"
}
] |
2009-05-18
|
[
[
"Costella",
"John P.",
""
],
[
"McKellar",
"Bruce H. J.",
""
],
[
"Rawlinson",
"Andrew A.",
""
]
] |
We review how antiparticles may be introduced in classical relativistic mechanics, and emphasize that many of their paradoxical properties can be more transparently understood in the classical than in the quantum domain.
|
1904.06015
|
Jian-ping Dai Dr
|
Xu Cao and Jian-ping Dai
|
Confronting pentaquark photoproduction with new LHCb observations
| null |
Phys. Rev. D 100, 054033 (2019)
|
10.1103/PhysRevD.100.054033
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The newly measurement of production fractions of $P_c$ states by LHCb
collaboration have put restriction on their branching ratios of $J/\psi p$
decay, thus constraining their photoproduction in $\gamma p\to J/\psi p$
reaction. We show the tension between LHCb results and the current experiments
in search of $P_c$ photoproduction. We also find that the present information
of branching ratios of $P_c\to J/\psi p$ has already confronted sharply with
the models which study the nature of $P_c$.
|
[
{
"created": "Fri, 12 Apr 2019 02:40:47 GMT",
"version": "v1"
},
{
"created": "Sun, 2 Jun 2019 15:12:51 GMT",
"version": "v2"
},
{
"created": "Fri, 13 Sep 2019 15:02:37 GMT",
"version": "v3"
}
] |
2019-10-02
|
[
[
"Cao",
"Xu",
""
],
[
"Dai",
"Jian-ping",
""
]
] |
The newly measurement of production fractions of $P_c$ states by LHCb collaboration have put restriction on their branching ratios of $J/\psi p$ decay, thus constraining their photoproduction in $\gamma p\to J/\psi p$ reaction. We show the tension between LHCb results and the current experiments in search of $P_c$ photoproduction. We also find that the present information of branching ratios of $P_c\to J/\psi p$ has already confronted sharply with the models which study the nature of $P_c$.
|
2106.05760
|
Ante Bilandzic
|
Ante Bilandzic
|
Event-by-event cumulants of azimuthal angles
|
15 pages, 5 figures. Prepared for "Offshell-2021" conference. This
version was accepted for publication in EPJC. Most important change between
v1 and v2: It was realized and acknowledged that analytic expressions in Eqs.
(16) and (24) for combinatorial background can be further generalized - the
generalization will be presented in the follow-up work
| null |
10.1140/epjc/s10052-022-10740-z
| null |
hep-ph hep-ex nucl-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We develop further the recently proposed event-by-event cumulants of
azimuthal angles. The role of reflection symmetry, permutation symmetry, frame
independence, and relabeling of particle indices in the cumulant expansion is
discussed in detail. We argue that mathematical and statistical properties of
cumulants are preserved if cumulants of azimuthal angles are defined
event-by-event in terms of single-event averages of azimuthal angles, while
they are violated in the traditional approach in which cumulants are defined in
terms of all-event averages. We derive for the first time the example analytic
solutions for the contribution of combinatorial background in the measured 2-
and 3-particle correlations. We demonstrate that these solutions for the
combinatorial background are universal as they can be written generically in
terms of multiplicity-dependent combinatorial weights and marginal probability
density functions of starting multivariate distribution. The new general
results between multiparticle azimuthal correlators and flow amplitudes and
symmetry planes are presented.
|
[
{
"created": "Thu, 10 Jun 2021 14:05:26 GMT",
"version": "v1"
},
{
"created": "Sat, 20 Aug 2022 06:59:53 GMT",
"version": "v2"
}
] |
2022-09-21
|
[
[
"Bilandzic",
"Ante",
""
]
] |
We develop further the recently proposed event-by-event cumulants of azimuthal angles. The role of reflection symmetry, permutation symmetry, frame independence, and relabeling of particle indices in the cumulant expansion is discussed in detail. We argue that mathematical and statistical properties of cumulants are preserved if cumulants of azimuthal angles are defined event-by-event in terms of single-event averages of azimuthal angles, while they are violated in the traditional approach in which cumulants are defined in terms of all-event averages. We derive for the first time the example analytic solutions for the contribution of combinatorial background in the measured 2- and 3-particle correlations. We demonstrate that these solutions for the combinatorial background are universal as they can be written generically in terms of multiplicity-dependent combinatorial weights and marginal probability density functions of starting multivariate distribution. The new general results between multiparticle azimuthal correlators and flow amplitudes and symmetry planes are presented.
|
0710.0940
|
Alexander Lenz
|
Alexander Lenz
|
The Theoretical status of $\bar{B}-B$-mixing and lifetimes of heavy
hadrons
|
Invited Plenary talk at The 4th International Conference on Flavor
Physics, Sep. 24-28, 2007, Beijing
|
Int.J.Mod.Phys.A23:3321-3328,2008
|
10.1142/S0217751X08042055
| null |
hep-ph
| null |
In this talk we review the theoretical status of the lifetime ratios of heavy
hadrons and of the B-mixing quantities $\Delta M_s$, $\Delta \Gamma_s$ and
$\phi_s$. While $\Delta M_s$ and $\Delta \Gamma_s$ suffer from large
uncertainties due to the badly known decay constants, the ratio $\Delta
\Gamma_s / \Delta M_s$ can be determined with almost no non-perturbative
uncertainties, therefore it can be used to look for possible new physics
effects.
|
[
{
"created": "Thu, 4 Oct 2007 08:09:24 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Lenz",
"Alexander",
""
]
] |
In this talk we review the theoretical status of the lifetime ratios of heavy hadrons and of the B-mixing quantities $\Delta M_s$, $\Delta \Gamma_s$ and $\phi_s$. While $\Delta M_s$ and $\Delta \Gamma_s$ suffer from large uncertainties due to the badly known decay constants, the ratio $\Delta \Gamma_s / \Delta M_s$ can be determined with almost no non-perturbative uncertainties, therefore it can be used to look for possible new physics effects.
|
0909.3290
|
Frieder Lenz
|
F. Lenz
|
Confining gauge fields
|
12 pages, 7 figures
|
Int.J.Mod.Phys.A25:490-501,2010
|
10.1142/S0217751X10048780
|
FAU-TP3-09-01
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
By superposition of regular gauge instantons or merons, ensembles of gauge
fields are constructed which describe the confining phase of SU(2) Yang-Mills
theory. Various properties of the Wilson loops, the gluon condensate and the
topological susceptibility are found to be in qualitative agreement with
phenomenology or results of lattice calculations. Limitations in the
application to the glueball spectrum and small size Wilson loops are discussed.
|
[
{
"created": "Thu, 17 Sep 2009 18:35:07 GMT",
"version": "v1"
}
] |
2010-02-16
|
[
[
"Lenz",
"F.",
""
]
] |
By superposition of regular gauge instantons or merons, ensembles of gauge fields are constructed which describe the confining phase of SU(2) Yang-Mills theory. Various properties of the Wilson loops, the gluon condensate and the topological susceptibility are found to be in qualitative agreement with phenomenology or results of lattice calculations. Limitations in the application to the glueball spectrum and small size Wilson loops are discussed.
|
1008.1967
|
Frans Klinkhamer
|
F.R. Klinkhamer
|
Potential sensitivities to Lorentz violation from nonbirefringent
modified Maxwell theory of Auger, HESS, and CTA
|
16 pages, v6: published version
|
Phys.Rev.D82:105024,2010
|
10.1103/PhysRevD.82.105024
|
KA-TP-26-2010
|
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Present and future ultra-high-energy-cosmic-ray facilities (e.g., the South
and North components of the Pierre Auger Observatory) and TeV-gamma-ray
telescope arrays (e.g., HESS and CTA) have the potential to set stringent
bounds on the nine Lorentz-violating parameters of nonbirefringent modified
Maxwell theory minimally coupled to standard Dirac theory. A concrete example
is given how to obtain, in the coming decennia, two-sided bounds on the eight
anisotropic parameters at the 10^{-20} level and an upper (lower) bound on the
single isotropic parameter at the +10^{-20} (-10^{-16}) level. Comparison is
made with existing and potential direct bounds from laboratory experiments.
|
[
{
"created": "Wed, 11 Aug 2010 18:48:15 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Aug 2010 19:15:07 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Aug 2010 21:08:42 GMT",
"version": "v3"
},
{
"created": "Mon, 18 Oct 2010 11:56:58 GMT",
"version": "v4"
},
{
"created": "Mon, 1 Nov 2010 10:26:00 GMT",
"version": "v5"
},
{
"created": "Wed, 24 Nov 2010 16:37:32 GMT",
"version": "v6"
}
] |
2010-12-23
|
[
[
"Klinkhamer",
"F. R.",
""
]
] |
Present and future ultra-high-energy-cosmic-ray facilities (e.g., the South and North components of the Pierre Auger Observatory) and TeV-gamma-ray telescope arrays (e.g., HESS and CTA) have the potential to set stringent bounds on the nine Lorentz-violating parameters of nonbirefringent modified Maxwell theory minimally coupled to standard Dirac theory. A concrete example is given how to obtain, in the coming decennia, two-sided bounds on the eight anisotropic parameters at the 10^{-20} level and an upper (lower) bound on the single isotropic parameter at the +10^{-20} (-10^{-16}) level. Comparison is made with existing and potential direct bounds from laboratory experiments.
|
hep-ph/0009240
|
Arthur Weldon
|
H. Arthur Weldon
|
Asymptotic Space-Time Behavior of HTL Gauge Propagator
|
19 pages, laTex
| null | null | null |
hep-ph
| null |
The asymptotic behavior as t\to\infty and r\to\infty of the hard-thermal-loop
propagator D^{\mu\nu}(t,r) is computed in the Coulomb gauge. The asymptotic
falloff is always a power law though generally different in the deep time-like
and space-like regions. The contributions of quasiparticle poles and Landau
branch cuts are computed. The most difficult calculation is the contribution of
the branch cut in the transverse propagator D^{ij}(t,r). For QED this produces
a leading behavior of order T/r in both the time-like and space-like regions.
The inclusion of a magnetic mass so as to describe QCD makes the leading
behavior 1/(Tr^{3}), thus improving the infrared convergence. The asymptotic
space-like behavior of all contributions (longitudinal and transverse, poles
and cuts) is confirmed by also computing in the Euclidean formalism and
analytically continuing. The results are compared will those for free gauge
bosons at finite temperature.
|
[
{
"created": "Wed, 20 Sep 2000 17:38:07 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Weldon",
"H. Arthur",
""
]
] |
The asymptotic behavior as t\to\infty and r\to\infty of the hard-thermal-loop propagator D^{\mu\nu}(t,r) is computed in the Coulomb gauge. The asymptotic falloff is always a power law though generally different in the deep time-like and space-like regions. The contributions of quasiparticle poles and Landau branch cuts are computed. The most difficult calculation is the contribution of the branch cut in the transverse propagator D^{ij}(t,r). For QED this produces a leading behavior of order T/r in both the time-like and space-like regions. The inclusion of a magnetic mass so as to describe QCD makes the leading behavior 1/(Tr^{3}), thus improving the infrared convergence. The asymptotic space-like behavior of all contributions (longitudinal and transverse, poles and cuts) is confirmed by also computing in the Euclidean formalism and analytically continuing. The results are compared will those for free gauge bosons at finite temperature.
|
1604.01134
|
Stephen P. Martin
|
Stephen P. Martin
|
Top-quark pole mass in the tadpole-free MS-bar scheme
|
24 pages. v2: references added, no other changes
|
Phys. Rev. D 93, 094017 (2016)
|
10.1103/PhysRevD.93.094017
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The complex pole mass of the top quark is presented at full two-loop order in
the Standard Model, augmenting the known four-loop QCD contributions. The input
parameters are the MS-bar Yukawa and gauge couplings, the Higgs self-coupling,
and the Higgs vacuum expectation value (VEV). Here, the VEV is defined as the
minimum of the full effective potential in Landau gauge, so that tadpoles
vanish. This is an alternative to earlier results that instead minimize the
tree-level potential, resulting in a VEV that is gauge-fixing independent but
accompanied by negative powers of the Higgs self-coupling in perturbative
expansions. The effects of non-zero Goldstone boson mass are eliminated by
resummation. I also study the renormalization scale dependence of the
calculated pole mass.
|
[
{
"created": "Tue, 5 Apr 2016 04:47:34 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Apr 2016 22:25:21 GMT",
"version": "v2"
}
] |
2016-05-25
|
[
[
"Martin",
"Stephen P.",
""
]
] |
The complex pole mass of the top quark is presented at full two-loop order in the Standard Model, augmenting the known four-loop QCD contributions. The input parameters are the MS-bar Yukawa and gauge couplings, the Higgs self-coupling, and the Higgs vacuum expectation value (VEV). Here, the VEV is defined as the minimum of the full effective potential in Landau gauge, so that tadpoles vanish. This is an alternative to earlier results that instead minimize the tree-level potential, resulting in a VEV that is gauge-fixing independent but accompanied by negative powers of the Higgs self-coupling in perturbative expansions. The effects of non-zero Goldstone boson mass are eliminated by resummation. I also study the renormalization scale dependence of the calculated pole mass.
|
2307.16229
|
Anatoly Kotikov Vassilievich
|
A.V. Kotikov, I.A. Kotikov
|
On ultrahigh-energy neutrino-nucleon deep-inelastic scattering and the
Froissart bound
|
10 pages, 1 figure, contribution to the proceedings of the 4th
International Symposium on Cosmic Rays and Astrophysics (June 27-29, Moscow,
Russia)
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A brief review of the results for the total cross section \sigma^{\nu N} of
ultrahigh-energy neutrino deep inelastic scattering on isoscalar nuclear
targets is presented. These results are based on simple approximations for
\sigma^{\nu N} and are compared with the experimental data of the IceCube
Collaboration. The total cross section \sigma^{\nu N} is proportional to the
structure function F_2^{\nu N}(M_V^2/s,M_V^2), where M_V is the intermediate
boson mass and s is square of the energy of the center of mass. The coefficient
in the front of F_2^{\nu N}(M_V^2/s,M_V^2) depends on the asymptotic behavior
of F_2^{\nu N} at low values of x. It contains an additional term \sim \ln{s}
if F_2^{\nu N} is scaled by the power \ln(1/x). Therefore, the asymptotic
behavior of F_2^{\nu N}\propto\ln^2(1/x) for small x often assumed in the
literature already leads to violation of the Froissart bound for \sigma^{\nu
N}.
|
[
{
"created": "Sun, 30 Jul 2023 13:42:45 GMT",
"version": "v1"
}
] |
2023-08-01
|
[
[
"Kotikov",
"A. V.",
""
],
[
"Kotikov",
"I. A.",
""
]
] |
A brief review of the results for the total cross section \sigma^{\nu N} of ultrahigh-energy neutrino deep inelastic scattering on isoscalar nuclear targets is presented. These results are based on simple approximations for \sigma^{\nu N} and are compared with the experimental data of the IceCube Collaboration. The total cross section \sigma^{\nu N} is proportional to the structure function F_2^{\nu N}(M_V^2/s,M_V^2), where M_V is the intermediate boson mass and s is square of the energy of the center of mass. The coefficient in the front of F_2^{\nu N}(M_V^2/s,M_V^2) depends on the asymptotic behavior of F_2^{\nu N} at low values of x. It contains an additional term \sim \ln{s} if F_2^{\nu N} is scaled by the power \ln(1/x). Therefore, the asymptotic behavior of F_2^{\nu N}\propto\ln^2(1/x) for small x often assumed in the literature already leads to violation of the Froissart bound for \sigma^{\nu N}.
|
0903.4598
|
Christophe Royon
|
F. Chevallier, O. Kepka, C. Marquet, C. Royon
|
Gaps between jets at hadron colliders in the next-to-leading BFKL
framework
|
10 pages, 9 figures
|
Phys.Rev.D79:094019,2009
|
10.1103/PhysRevD.79.094019
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate diffractive events in hadron-hadron collisions, in which two
jets are produced and separated by a large rapidity gap. In perturbative QCD,
the hard color-singlet object exchanged in the t-channel, and responsible for
the rapidity gap, is the Balitsky-Fadin-Kuraev-Lipatov (BFKL) Pomeron. We
perform a phenomenological study including the corrections due to
next-to-leading logarithms (NLL). Using a renormalisation-group improved NLL
kernel, we show that the BFKL predictions are in good agreement with the
Tevatron data, and present predictions which could be tested at the LHC.
|
[
{
"created": "Thu, 26 Mar 2009 14:42:45 GMT",
"version": "v1"
}
] |
2009-07-30
|
[
[
"Chevallier",
"F.",
""
],
[
"Kepka",
"O.",
""
],
[
"Marquet",
"C.",
""
],
[
"Royon",
"C.",
""
]
] |
We investigate diffractive events in hadron-hadron collisions, in which two jets are produced and separated by a large rapidity gap. In perturbative QCD, the hard color-singlet object exchanged in the t-channel, and responsible for the rapidity gap, is the Balitsky-Fadin-Kuraev-Lipatov (BFKL) Pomeron. We perform a phenomenological study including the corrections due to next-to-leading logarithms (NLL). Using a renormalisation-group improved NLL kernel, we show that the BFKL predictions are in good agreement with the Tevatron data, and present predictions which could be tested at the LHC.
|
1803.02868
|
Sanjib Kumar Agarwalla
|
Sanjib Kumar Agarwalla, Amina Khatun, Ranjan Laha
|
Looking for Galactic Diffuse Dark Matter in INO-MagICAL Detector
|
Proceedings of the 19th International Workshop on Neutrinos from
Accelerators (NUFACT 2017)
| null | null | null |
hep-ph hep-ex physics.ins-det
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Weakly Interacting Massive Particle (WIMP) is a popular particle physics
candidate for the dark matter (DM). It can annihilate and/or decay to neutrino
and antineutrino pair. The proposed 50 kt Magnetized Iron CALorimeter (MagICAL)
detector at the India-based Neutrino Observatory (INO) can observe these pairs
over the conventional atmospheric neutrino and antineutrino fluxes. If we do
not see any excess of events in ten years, then INO-Magical can place
competitive limits on self-annihilation cross-section ($\langle\sigma
v\rangle$) and decay lifetime ($\tau$) of dark matter at 90\% C.L.:
$\langle\sigma v\rangle\leq 1.87\,\times\,10^{-24}$ cm$^3$ s$^{-1}$ and
$\tau\geq 4.8\,\times\,10^{24}$ s for $m_\chi$ = 10 GeV assuming the NFW as DM
density profile.
|
[
{
"created": "Wed, 7 Mar 2018 20:40:10 GMT",
"version": "v1"
}
] |
2018-03-09
|
[
[
"Agarwalla",
"Sanjib Kumar",
""
],
[
"Khatun",
"Amina",
""
],
[
"Laha",
"Ranjan",
""
]
] |
The Weakly Interacting Massive Particle (WIMP) is a popular particle physics candidate for the dark matter (DM). It can annihilate and/or decay to neutrino and antineutrino pair. The proposed 50 kt Magnetized Iron CALorimeter (MagICAL) detector at the India-based Neutrino Observatory (INO) can observe these pairs over the conventional atmospheric neutrino and antineutrino fluxes. If we do not see any excess of events in ten years, then INO-Magical can place competitive limits on self-annihilation cross-section ($\langle\sigma v\rangle$) and decay lifetime ($\tau$) of dark matter at 90\% C.L.: $\langle\sigma v\rangle\leq 1.87\,\times\,10^{-24}$ cm$^3$ s$^{-1}$ and $\tau\geq 4.8\,\times\,10^{24}$ s for $m_\chi$ = 10 GeV assuming the NFW as DM density profile.
|
1312.1227
|
Luca Stanco
|
L. Stanco, A. Anokhina, A. Bagulya, M. Benettoni, P. Bernardini, A.
Bertolin, R. Brugnera, M. Calabrese, A. Cecchetti, S. Cecchini, M.
Chernyavskiy, G. Collazuol, P. Creti, F. Dal Corso, O. Dalkarov, A. Del
Prete, I. De Mitri, G. De Robertis, M. De Serio, L. Degli Esposti, D. Di
Ferdinando, U. Dore, S. Dusini, T. Dzhatdoev, C. Fanin, R. A. Fini, G. Fiore,
G. Galati, A. Garfagnini, G. Giacomelli, R. Giacomelli, S. Golovanov, C.
Guandalin, M. Guerzoni, B. Klicek, U. Kose, K. Jakovcic, G. Laurenti, M.
Laveder, I. Lippi, F. Loddo, A. Longhin, P. Loverre, M. Malenica, G.
Mancarella, G. Mandrioli, A. Margiotta, G. Marsella, N. Mauri, E. Medinaceli,
A. Mengucci, M. Mezzetto, R. Michinelli, R. Mingazheva, O. Morgunova, M. T.
Muciaccia, D. Orecchini, A. Paoloni, G. Papadia, L. Paparella, A. Pastore, L.
Patrizii, N. Polukhina, M. Pozzato, M. Roda, T. Roganova, G. Rosa, Z.
Sahnoun, S. Simone, M. Sioli, C. Sirignano, G. Sirri, M. Spurio, N. Starkov,
M. Stipcevic, A. Surdo, M. Tenti, V. Togo, M. Ventura, M. Vladymyrov and M.
Zago
|
The NESSiE Concept for Sterile Neutrinos
|
13 pages, Proceedings of XV Workshop on Neutrino Telescopes, 11-15
March 2013, Venice, Italy
| null | null | null |
hep-ph physics.ins-det
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Neutrino physics is nowadays receiving more and more attention as a possible
source of information for the long-standing problem of new physics beyond the
Standard Model. The recent measurement of the third mixing angle theta13 in the
standard mixing oscillation scenario encourages us to pursue the still missing
results on leptonic CP violation and absolute neutrino masses. However, several
puzzling measurements exist, which deserve an exhaustive evaluation. The NESSiE
Collaboration has been setup to undertake a definitive experiment to clarify
the muon disappearance measurements at small L/E, which will be able to put
severe constraints to any model with more than the three-standard neutrinos, or
even to robustly measure the presence of a new kind of neutrino oscillation for
the first time. Within the context of the current CERN project, aimed to
revitalize the neutrino field in Europe, we will illustrate the achievements
that can be obtained by a double muon-spectrometer system, with emphasis on the
search for sterile neutrinos.
|
[
{
"created": "Wed, 4 Dec 2013 16:07:51 GMT",
"version": "v1"
}
] |
2013-12-05
|
[
[
"Stanco",
"L.",
""
],
[
"Anokhina",
"A.",
""
],
[
"Bagulya",
"A.",
""
],
[
"Benettoni",
"M.",
""
],
[
"Bernardini",
"P.",
""
],
[
"Bertolin",
"A.",
""
],
[
"Brugnera",
"R.",
""
],
[
"Calabrese",
"M.",
""
],
[
"Cecchetti",
"A.",
""
],
[
"Cecchini",
"S.",
""
],
[
"Chernyavskiy",
"M.",
""
],
[
"Collazuol",
"G.",
""
],
[
"Creti",
"P.",
""
],
[
"Corso",
"F. Dal",
""
],
[
"Dalkarov",
"O.",
""
],
[
"Del Prete",
"A.",
""
],
[
"De Mitri",
"I.",
""
],
[
"De Robertis",
"G.",
""
],
[
"De Serio",
"M.",
""
],
[
"Esposti",
"L. Degli",
""
],
[
"Di Ferdinando",
"D.",
""
],
[
"Dore",
"U.",
""
],
[
"Dusini",
"S.",
""
],
[
"Dzhatdoev",
"T.",
""
],
[
"Fanin",
"C.",
""
],
[
"Fini",
"R. A.",
""
],
[
"Fiore",
"G.",
""
],
[
"Galati",
"G.",
""
],
[
"Garfagnini",
"A.",
""
],
[
"Giacomelli",
"G.",
""
],
[
"Giacomelli",
"R.",
""
],
[
"Golovanov",
"S.",
""
],
[
"Guandalin",
"C.",
""
],
[
"Guerzoni",
"M.",
""
],
[
"Klicek",
"B.",
""
],
[
"Kose",
"U.",
""
],
[
"Jakovcic",
"K.",
""
],
[
"Laurenti",
"G.",
""
],
[
"Laveder",
"M.",
""
],
[
"Lippi",
"I.",
""
],
[
"Loddo",
"F.",
""
],
[
"Longhin",
"A.",
""
],
[
"Loverre",
"P.",
""
],
[
"Malenica",
"M.",
""
],
[
"Mancarella",
"G.",
""
],
[
"Mandrioli",
"G.",
""
],
[
"Margiotta",
"A.",
""
],
[
"Marsella",
"G.",
""
],
[
"Mauri",
"N.",
""
],
[
"Medinaceli",
"E.",
""
],
[
"Mengucci",
"A.",
""
],
[
"Mezzetto",
"M.",
""
],
[
"Michinelli",
"R.",
""
],
[
"Mingazheva",
"R.",
""
],
[
"Morgunova",
"O.",
""
],
[
"Muciaccia",
"M. T.",
""
],
[
"Orecchini",
"D.",
""
],
[
"Paoloni",
"A.",
""
],
[
"Papadia",
"G.",
""
],
[
"Paparella",
"L.",
""
],
[
"Pastore",
"A.",
""
],
[
"Patrizii",
"L.",
""
],
[
"Polukhina",
"N.",
""
],
[
"Pozzato",
"M.",
""
],
[
"Roda",
"M.",
""
],
[
"Roganova",
"T.",
""
],
[
"Rosa",
"G.",
""
],
[
"Sahnoun",
"Z.",
""
],
[
"Simone",
"S.",
""
],
[
"Sioli",
"M.",
""
],
[
"Sirignano",
"C.",
""
],
[
"Sirri",
"G.",
""
],
[
"Spurio",
"M.",
""
],
[
"Starkov",
"N.",
""
],
[
"Stipcevic",
"M.",
""
],
[
"Surdo",
"A.",
""
],
[
"Tenti",
"M.",
""
],
[
"Togo",
"V.",
""
],
[
"Ventura",
"M.",
""
],
[
"Vladymyrov",
"M.",
""
],
[
"Zago",
"M.",
""
]
] |
Neutrino physics is nowadays receiving more and more attention as a possible source of information for the long-standing problem of new physics beyond the Standard Model. The recent measurement of the third mixing angle theta13 in the standard mixing oscillation scenario encourages us to pursue the still missing results on leptonic CP violation and absolute neutrino masses. However, several puzzling measurements exist, which deserve an exhaustive evaluation. The NESSiE Collaboration has been setup to undertake a definitive experiment to clarify the muon disappearance measurements at small L/E, which will be able to put severe constraints to any model with more than the three-standard neutrinos, or even to robustly measure the presence of a new kind of neutrino oscillation for the first time. Within the context of the current CERN project, aimed to revitalize the neutrino field in Europe, we will illustrate the achievements that can be obtained by a double muon-spectrometer system, with emphasis on the search for sterile neutrinos.
|
hep-ph/9812483
|
Georgi Dvali
|
Gia Dvali and S.-H. Henry Tye
|
Brane Inflation
|
15 pages, Latex
|
Phys.Lett. B450 (1999) 72-82
|
10.1016/S0370-2693(99)00132-X
|
NYU-TH/12/98/01, CLNS 98/1600
|
hep-ph
| null |
We present a novel inflationary scenario in theories with low scale (TeV)
quantum gravity, in which the standard model particles are localized on the
branes whereas gravity propagates in the bulk of large extra dimensions. This
inflationary scenario is natural in the brane world picture. In the lowest
energy state, a number of branes sit on top of each other (or at an orientifold
plane), so the vacuum energy cancels out. In the cosmological setting, some of
the branes "start out" relatively displaced in the extra dimensions and the
resulting vacuum energy triggers the exponential growth of the 3 non-compact
dimensions. The number of e-foldings can be very large due to the very weak
brane-brane interaction at large distances. In the effective four-dimensional
field theory, the brane motion is described by a slowly rolling scalar field
with an extremely flat plateau potential. When branes approach each other to a
critical distance, the potential becomes steep and inflation ends rapidly. Then
the branes "collide" and oscillate about the equilibrium point, releasing
energy mostly into radiation on the branes.
|
[
{
"created": "Tue, 22 Dec 1998 21:04:15 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Dvali",
"Gia",
""
],
[
"Tye",
"S. -H. Henry",
""
]
] |
We present a novel inflationary scenario in theories with low scale (TeV) quantum gravity, in which the standard model particles are localized on the branes whereas gravity propagates in the bulk of large extra dimensions. This inflationary scenario is natural in the brane world picture. In the lowest energy state, a number of branes sit on top of each other (or at an orientifold plane), so the vacuum energy cancels out. In the cosmological setting, some of the branes "start out" relatively displaced in the extra dimensions and the resulting vacuum energy triggers the exponential growth of the 3 non-compact dimensions. The number of e-foldings can be very large due to the very weak brane-brane interaction at large distances. In the effective four-dimensional field theory, the brane motion is described by a slowly rolling scalar field with an extremely flat plateau potential. When branes approach each other to a critical distance, the potential becomes steep and inflation ends rapidly. Then the branes "collide" and oscillate about the equilibrium point, releasing energy mostly into radiation on the branes.
|
1712.02798
|
Chee Sheng Fong
|
Chee Sheng Fong, Hisakazu Minakata, Hiroshi Nunokawa
|
Non-unitary evolution of neutrinos in matter and the leptonic unitarity
test
|
35 content pages + 12 appendix pages, 4 figures; Several clarifying
modifications to match the published version
|
JHEP 1902 (2019) 015
|
10.1007/JHEP02(2019)015
|
IFT-UAM/CSIC-17-117
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a comprehensive study of the three-active plus $N$ sterile
neutrino model as a framework for constraining leptonic unitarity violation
induced at energy scales much lower than the electroweak scale. We formulate a
perturbation theory with expansion in small unitarity violating matrix element
$W$ while keeping (non-$W$ suppressed) matter effect to all orders. We show
that under the same condition of sterile state masses $0.1\, \text{eV}^2
\lesssim m^2_{J} \lesssim (1-10)\, \text{GeV}^2$ as in vacuum, assuming typical
accelerator based long-baseline neutrino oscillation experiment, one can derive
a very simple form of the oscillation probability which consists only of
zeroth-order terms with the unique exception of probability leaking term
$\mathcal{C}_{\alpha \beta}$ of $\mathcal{O} (W^4)$. We argue, based on our
explicit computation to fourth-order in $W$, that all the other terms are
negligibly small after taking into account the suppression due to the mass
condition for sterile states, rendering the oscillation probability {\em
sterile-sector model independent}. Then, we identify a limited energy region in
which this suppression is evaded and the effects of order $W^2$ corrections may
be observable. Its detection would provide another way, in addition to
detecting $\mathcal{C}_{\alpha \beta}$, to distinguish between low-scale and
high-scale unitarity violation. We also solve analytically the zeroth-order
system in matter with uniform density to provide a basis for numerical
evaluation of non-unitary neutrino evolution.
|
[
{
"created": "Thu, 7 Dec 2017 19:00:06 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Feb 2019 15:41:34 GMT",
"version": "v2"
}
] |
2019-02-13
|
[
[
"Fong",
"Chee Sheng",
""
],
[
"Minakata",
"Hisakazu",
""
],
[
"Nunokawa",
"Hiroshi",
""
]
] |
We present a comprehensive study of the three-active plus $N$ sterile neutrino model as a framework for constraining leptonic unitarity violation induced at energy scales much lower than the electroweak scale. We formulate a perturbation theory with expansion in small unitarity violating matrix element $W$ while keeping (non-$W$ suppressed) matter effect to all orders. We show that under the same condition of sterile state masses $0.1\, \text{eV}^2 \lesssim m^2_{J} \lesssim (1-10)\, \text{GeV}^2$ as in vacuum, assuming typical accelerator based long-baseline neutrino oscillation experiment, one can derive a very simple form of the oscillation probability which consists only of zeroth-order terms with the unique exception of probability leaking term $\mathcal{C}_{\alpha \beta}$ of $\mathcal{O} (W^4)$. We argue, based on our explicit computation to fourth-order in $W$, that all the other terms are negligibly small after taking into account the suppression due to the mass condition for sterile states, rendering the oscillation probability {\em sterile-sector model independent}. Then, we identify a limited energy region in which this suppression is evaded and the effects of order $W^2$ corrections may be observable. Its detection would provide another way, in addition to detecting $\mathcal{C}_{\alpha \beta}$, to distinguish between low-scale and high-scale unitarity violation. We also solve analytically the zeroth-order system in matter with uniform density to provide a basis for numerical evaluation of non-unitary neutrino evolution.
|
hep-ph/9807344
|
Dvali Georgi
|
Nima Arkani-Hamed, Savas Dimopoulos and Gia Dvali
|
Phenomenology, Astrophysics and Cosmology of Theories with
Sub-Millimeter Dimensions and TeV Scale Quantum Gravity
|
51 pages, latex
|
Phys.Rev. D59 (1999) 086004
|
10.1103/PhysRevD.59.086004
|
SLAC-PUB-7864, SU-ITP-98/142, IC/98/44
|
hep-ph astro-ph hep-th
| null |
We recently proposed a solution to the hierarchy problem not relying on
low-energy supersymmetry or technicolor. Instead, the problem is nullified by
bringing quantum gravity down to the TeV scale. This is accomplished by the
presence of $n \geq 2$ new dimensions of sub-millimeter size, with the SM
fields localised on a 3-brane in the higher dimensional space. In this paper we
systematically study the experimental viability of this scenario. Constraints
arise both from strong quantum gravitational effects at the TeV scale, and more
importantly from the production of massless higher dimensional gravitons with
TeV suppressed couplings. Theories with $n>2$ are safe due mainly to the
infrared softness of higher dimensional gravity. For $n=2$, the six dimensional
Planck scale must be pushed above $\sim 30$ TeV to avoid cooling SN1987A and
distortions of the diffuse photon background. Nevertheless, the particular
implementation of our framework within type I string theory can evade all
constraints, for any $n \geq 2$, with string scale $m_s \sim 1$ TeV. We also
explore novel phenomena resulting from the existence of new states propagating
in the higher dimensional space. The Peccei-Quinn solution to the strong CP
problem is revived with a weak scale axion in the bulk. Gauge fields in the
bulk can mediate repulsive forces $\sim 10^6 - 10^8$ times stronger than
gravity at sub-mm distances, and may help stabilize the proton.
Higher-dimensional gravitons produced on our brane and captured on a different
"fat" brane can provide a natural dark matter candidate.
|
[
{
"created": "Sun, 12 Jul 1998 01:02:42 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Arkani-Hamed",
"Nima",
""
],
[
"Dimopoulos",
"Savas",
""
],
[
"Dvali",
"Gia",
""
]
] |
We recently proposed a solution to the hierarchy problem not relying on low-energy supersymmetry or technicolor. Instead, the problem is nullified by bringing quantum gravity down to the TeV scale. This is accomplished by the presence of $n \geq 2$ new dimensions of sub-millimeter size, with the SM fields localised on a 3-brane in the higher dimensional space. In this paper we systematically study the experimental viability of this scenario. Constraints arise both from strong quantum gravitational effects at the TeV scale, and more importantly from the production of massless higher dimensional gravitons with TeV suppressed couplings. Theories with $n>2$ are safe due mainly to the infrared softness of higher dimensional gravity. For $n=2$, the six dimensional Planck scale must be pushed above $\sim 30$ TeV to avoid cooling SN1987A and distortions of the diffuse photon background. Nevertheless, the particular implementation of our framework within type I string theory can evade all constraints, for any $n \geq 2$, with string scale $m_s \sim 1$ TeV. We also explore novel phenomena resulting from the existence of new states propagating in the higher dimensional space. The Peccei-Quinn solution to the strong CP problem is revived with a weak scale axion in the bulk. Gauge fields in the bulk can mediate repulsive forces $\sim 10^6 - 10^8$ times stronger than gravity at sub-mm distances, and may help stabilize the proton. Higher-dimensional gravitons produced on our brane and captured on a different "fat" brane can provide a natural dark matter candidate.
|
1303.2384
|
Pearl Sandick
|
Jason Kumar and Pearl Sandick
|
Gamma Rays from Bino-like Dark Matter in the MSSM
|
10 pages, 3 figures. V2: minor updates, references added. V3: Matches
published version
|
PRD 87, 123534 (2013)
|
10.1103/PhysRevD.87.123534
|
UH-511-1208-2013, CETUP*12-020
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider regions of the parameter space of the Minimal Supersymmetric
Standard Model (MSSM) with bino-like neutralino dark matter in which a large
fraction of the total dark matter annihilation cross section in the present era
arises from annihilation to final states with monoenergetic photons. The region
of interest is characterized by light sleptons and heavy squarks. We find that
it is possible for the branching fraction to final states with monoenergetic
photons to be comparable to that for continuum photons, but in those cases the
total cross section will be so small that it is unlikely to be observable. For
models where dark matter annihilation may be observable in the present era, the
branching fraction to final states with monoenergetic photons is O(1-10%).
|
[
{
"created": "Sun, 10 Mar 2013 22:01:15 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Apr 2013 21:53:39 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Jul 2013 21:04:00 GMT",
"version": "v3"
}
] |
2013-08-09
|
[
[
"Kumar",
"Jason",
""
],
[
"Sandick",
"Pearl",
""
]
] |
We consider regions of the parameter space of the Minimal Supersymmetric Standard Model (MSSM) with bino-like neutralino dark matter in which a large fraction of the total dark matter annihilation cross section in the present era arises from annihilation to final states with monoenergetic photons. The region of interest is characterized by light sleptons and heavy squarks. We find that it is possible for the branching fraction to final states with monoenergetic photons to be comparable to that for continuum photons, but in those cases the total cross section will be so small that it is unlikely to be observable. For models where dark matter annihilation may be observable in the present era, the branching fraction to final states with monoenergetic photons is O(1-10%).
|
1510.04512
|
Michele Pepe
|
Michele Pepe (INFN, Milan Bicocca), Leonardo Giusti (Milan Bicocca U.
& INFN, Milan Bicocca)
|
Renormalization of the energy-momentum tensor on the lattice
|
7 pages, 2 figures, proceedings of the European Physical Society
Conference on High Energy Physics, 22-29 July 2015, Vienna, Austria
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the calculation of the non-perturbative renormalization constants
of the energy-momentum tensor in the SU(3) Yang-Mills theory. That computation
is carried out in the framework of shifted boundary conditions, where a thermal
quantum field theory is formulated in a moving reference frame. The
non-perturbative renormalization factors are then used to measure the Equation
of State of the SU(3) Yang-Mills theory. Preliminary numerical results are
presented and discussed.
|
[
{
"created": "Thu, 15 Oct 2015 12:50:02 GMT",
"version": "v1"
}
] |
2015-10-16
|
[
[
"Pepe",
"Michele",
"",
"INFN, Milan Bicocca"
],
[
"Giusti",
"Leonardo",
"",
"Milan Bicocca U.\n & INFN, Milan Bicocca"
]
] |
We present the calculation of the non-perturbative renormalization constants of the energy-momentum tensor in the SU(3) Yang-Mills theory. That computation is carried out in the framework of shifted boundary conditions, where a thermal quantum field theory is formulated in a moving reference frame. The non-perturbative renormalization factors are then used to measure the Equation of State of the SU(3) Yang-Mills theory. Preliminary numerical results are presented and discussed.
|
hep-ph/0506044
|
Artem Lipatov
|
A.V. Lipatov, N.P. Zotov
|
Prompt photon photoproduction at HERA in the k_T-factorization approach
|
34 pages, 18 figures
|
Phys.Rev. D72 (2005) 054002
|
10.1103/PhysRevD.72.054002
| null |
hep-ph
| null |
We present calculations of the prompt photon photoproduction at HERA collider
in the k_T-factorization approach. Both direct and resolved contributions are
taken into account. The conservative error analisys is performed. The
unintegrated parton densities in a proton and in a photon are determined using
the Kimber-Martin-Ryskin prescription. We investigate both inclusive and
associated with jet prompt photon photoproduction rates. In particular, we
study the angular correlations between produced photon and hadronic jet in the
transverse momentum plane which can provide a unique information about
non-collinear evolution dynamics. We compare our theoretical predictions with
recent experimental data taken by the H1 and ZEUS collaborations.
|
[
{
"created": "Mon, 6 Jun 2005 08:17:05 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Lipatov",
"A. V.",
""
],
[
"Zotov",
"N. P.",
""
]
] |
We present calculations of the prompt photon photoproduction at HERA collider in the k_T-factorization approach. Both direct and resolved contributions are taken into account. The conservative error analisys is performed. The unintegrated parton densities in a proton and in a photon are determined using the Kimber-Martin-Ryskin prescription. We investigate both inclusive and associated with jet prompt photon photoproduction rates. In particular, we study the angular correlations between produced photon and hadronic jet in the transverse momentum plane which can provide a unique information about non-collinear evolution dynamics. We compare our theoretical predictions with recent experimental data taken by the H1 and ZEUS collaborations.
|
1909.12564
|
Wei-Jie Fu
|
Rui Wen and Wei-jie Fu
|
Correlations of conserved charges and QCD phase structure
|
14 pages, 9 figures, 1 table; v2: discussion and Fig.5 added
| null |
10.1088/1674-1137/abe199
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Correlations of conserved charges, i.e., the baryon number, electric charge
and the strangeness, have been calculated at finite temperature and chemical
potential up to the fourth order. The calculations are done in a 2+1 flavor low
energy effective theory, where quantum and thermal fluctuations are encoded
through the evolution of flow equations within the functional renormalization
group approach. Strangeness neutrality and a fixed ratio of the electric charge
to the baryon number density are implemented throughout the computation. We
find that higher-order correlations carry more sensitive critical dynamics in
comparison to the quadratic ones, and a non-monotonic dependence of the
fourth-order correlations between the baryon number and strangeness,
$-\chi^{BS}_{31}/\chi^{S}_{2}$ and $\chi^{BS}_{22}/\chi^{S}_{2}$, on the
collision energy is found.
|
[
{
"created": "Fri, 27 Sep 2019 08:56:16 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jun 2020 14:26:59 GMT",
"version": "v2"
}
] |
2021-05-26
|
[
[
"Wen",
"Rui",
""
],
[
"Fu",
"Wei-jie",
""
]
] |
Correlations of conserved charges, i.e., the baryon number, electric charge and the strangeness, have been calculated at finite temperature and chemical potential up to the fourth order. The calculations are done in a 2+1 flavor low energy effective theory, where quantum and thermal fluctuations are encoded through the evolution of flow equations within the functional renormalization group approach. Strangeness neutrality and a fixed ratio of the electric charge to the baryon number density are implemented throughout the computation. We find that higher-order correlations carry more sensitive critical dynamics in comparison to the quadratic ones, and a non-monotonic dependence of the fourth-order correlations between the baryon number and strangeness, $-\chi^{BS}_{31}/\chi^{S}_{2}$ and $\chi^{BS}_{22}/\chi^{S}_{2}$, on the collision energy is found.
|
1007.0629
|
Steven D. Bass
|
Steven D. Bass and Anthony W. Thomas
|
Eta-etaprime mixing in eta-mesic nuclei
|
10 pages, invited talk at the International Symposium on Mesic
Nuclei, Cracow, Poland 16 June 2010
|
Acta Phys.Polon.B41:2239-2248,2010
| null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Eta bound states in nuclei are sensitive to the flavour-singlet component in
the eta. The bigger the singlet component, the more attraction and the greater
the binding. eta-etaprime mixing plays an important role in understanding the
value of the eta-nucleon scattering length a_{\eta N}. Working with the Quark
Meson Coupling model, we find a factor of two enhancement from mixing relative
to the prediction with a pure octet eta.
|
[
{
"created": "Mon, 5 Jul 2010 07:49:06 GMT",
"version": "v1"
}
] |
2010-12-17
|
[
[
"Bass",
"Steven D.",
""
],
[
"Thomas",
"Anthony W.",
""
]
] |
Eta bound states in nuclei are sensitive to the flavour-singlet component in the eta. The bigger the singlet component, the more attraction and the greater the binding. eta-etaprime mixing plays an important role in understanding the value of the eta-nucleon scattering length a_{\eta N}. Working with the Quark Meson Coupling model, we find a factor of two enhancement from mixing relative to the prediction with a pure octet eta.
|
0802.4303
|
Rogerio Rosenfeld
|
Alfonso R. Zerwekh, Claudio O. Dib and Rogerio Rosenfeld
|
A new signature for color octet pseudoscalars at the LHC
|
4 pages, 2 figures. New references added
|
Phys.Rev.D77:097703,2008
|
10.1103/PhysRevD.77.097703
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Color octet (pseudo)scalars, if they exist, will be copiously produced at the
CERN Large Hadron Collider (LHC). However, their detection can become a very
challenging task. In particular, if their decay into a pair of top quarks is
kinematically forbidden, the main decay channel would be into two jets, with a
very large background. In this Brief Report we explore the possibility of using
anomaly-induced decays of the color octet pseudoscalars into gauge bosons to
find them at the LHC.
|
[
{
"created": "Thu, 28 Feb 2008 22:19:34 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Mar 2008 11:19:40 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Zerwekh",
"Alfonso R.",
""
],
[
"Dib",
"Claudio O.",
""
],
[
"Rosenfeld",
"Rogerio",
""
]
] |
Color octet (pseudo)scalars, if they exist, will be copiously produced at the CERN Large Hadron Collider (LHC). However, their detection can become a very challenging task. In particular, if their decay into a pair of top quarks is kinematically forbidden, the main decay channel would be into two jets, with a very large background. In this Brief Report we explore the possibility of using anomaly-induced decays of the color octet pseudoscalars into gauge bosons to find them at the LHC.
|
0809.1149
|
Eef van Beveren
|
Eef van Beveren and George Rupp
|
Meson-meson interactions and Regge propagators
|
21 pages plain LaTeX with 3 figures
|
Annals Phys.324:1620-1633,2009
|
10.1016/j.aop.2009.03.013
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
By a reformulation of the loop expansion in the Resonance-Spectrum-Expansion
amplitude for meson-meson scattering, in terms of s-channel exchange of
families of propagator modes, we obtain a formalism which allows for a wider
range of applications. The connection with the unitarized amplitudes employed
in some chiral theories is discussed. We also define an alternative for the
Regge spectra and indicate how this may be observed in experiment.
|
[
{
"created": "Sat, 6 Sep 2008 09:34:49 GMT",
"version": "v1"
}
] |
2009-11-18
|
[
[
"van Beveren",
"Eef",
""
],
[
"Rupp",
"George",
""
]
] |
By a reformulation of the loop expansion in the Resonance-Spectrum-Expansion amplitude for meson-meson scattering, in terms of s-channel exchange of families of propagator modes, we obtain a formalism which allows for a wider range of applications. The connection with the unitarized amplitudes employed in some chiral theories is discussed. We also define an alternative for the Regge spectra and indicate how this may be observed in experiment.
|
hep-ph/0602252
|
Guy F. de T\'eramond
|
Stanley J. Brodsky and Guy F. de Teramond
|
Hadronic Spectra and Light-Front Wavefunctions in Holographic QCD
|
4 pages, REVTex4, 2 figures. References added. To appear in Phys.
Rev. Lett
|
Phys.Rev.Lett.96:201601,2006
|
10.1103/PhysRevLett.96.201601
|
SLAC-PUB-11716
|
hep-ph hep-th
| null |
We show how the string amplitude $\Phi(z)$ defined on the fifth dimension in
AdS$_5$ space can be precisely mapped to the light-front wavefunctions of
hadrons in physical spacetime. We find an exact correspondence between the
holographic variable $z$ and an impact variable $\zeta$, which represents the
measure of transverse separation of the constituents within the hadrons. In
addition, we derive effective four dimensional Schr\"odinger equations for the
bound states of massless quarks and gluons which exactly reproduce the AdS/CFT
results and give a realistic description of the light-quark meson and baryon
spectrum as well as the form factors for spacelike $Q^2$. Only one parameter
which sets the mass scale, $\Lambda_{QCD}$, is introduced.
|
[
{
"created": "Tue, 28 Feb 2006 20:09:58 GMT",
"version": "v1"
},
{
"created": "Mon, 8 May 2006 23:19:30 GMT",
"version": "v2"
}
] |
2009-07-09
|
[
[
"Brodsky",
"Stanley J.",
""
],
[
"de Teramond",
"Guy F.",
""
]
] |
We show how the string amplitude $\Phi(z)$ defined on the fifth dimension in AdS$_5$ space can be precisely mapped to the light-front wavefunctions of hadrons in physical spacetime. We find an exact correspondence between the holographic variable $z$ and an impact variable $\zeta$, which represents the measure of transverse separation of the constituents within the hadrons. In addition, we derive effective four dimensional Schr\"odinger equations for the bound states of massless quarks and gluons which exactly reproduce the AdS/CFT results and give a realistic description of the light-quark meson and baryon spectrum as well as the form factors for spacelike $Q^2$. Only one parameter which sets the mass scale, $\Lambda_{QCD}$, is introduced.
|
hep-ph/9511296
|
Chi-Keung Chow
|
Chi-Keung Chow
|
Heavy Baryons and Multiquark Exotics in the Large $N_c$ limit
|
8 pages in REVTeX, no figures, to appear in the proceedings of the
Baryons '95 conference at Santa Fe, New Mexico
| null | null |
CLNS 95/1374
|
hep-ph
| null |
In the large $N_c$ limit, one can describe normal heavy baryons $Qqq$ and
heavy pentaquarks $\bar Qqqqq$ as bound states of heavy mesons to chiral
(anti)solitons. In this picture, the strong and electromagnetic decay
parameters of these hadrons can be calculated from those of the constituent
heavy mesons and light baryons, while the weak decay form factors can be
evaluated analytically.
|
[
{
"created": "Fri, 10 Nov 1995 20:27:26 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Chow",
"Chi-Keung",
""
]
] |
In the large $N_c$ limit, one can describe normal heavy baryons $Qqq$ and heavy pentaquarks $\bar Qqqqq$ as bound states of heavy mesons to chiral (anti)solitons. In this picture, the strong and electromagnetic decay parameters of these hadrons can be calculated from those of the constituent heavy mesons and light baryons, while the weak decay form factors can be evaluated analytically.
|
0911.3297
|
Olga Solovtsova
|
Roman S. Pasechnik, Dmitry V. Shirkov, Oleg V. Teryaev, Olga P.
Solovtsova, Vyacheslav L. Khandramai
|
Nucleon spin structure and pQCD frontier on the move
|
21 pages, 12 figures, references added, minor corrections
|
Phys.Rev.D81:016010,2010
|
10.1103/PhysRevD.81.016010
| null |
hep-ph
|
http://creativecommons.org/licenses/by/3.0/
|
The interplay between higher orders of the perturbative QCD (pQCD) expansion
and higher-twist contributions in the analysis of recent Jefferson Lab data on
the lowest moment of the spin-dependent proton $\Gamma_1^{p} (Q^2)$ at
$0.05<Q^2< 3 {\rm GeV}^2$ is studied. We demonstrate that the values of the
higher-twist coefficients $\mu^{p,n}_{2k} $ extracted from the data by using
the singularity-free analytic perturbation theory provide a better convergence
of the higher-twist series than with the standard perturbative QCD. From the
high-precision proton data, we extract the value of the singlet axial charge
$a_0(1 {\rm GeV}^2)=0.33\pm0.05$. We observe a slow $Q^2$ dependence of fitted
values of the twist coefficient $\mu_4$ and $a_0$ when going to lower energy
scales, which can be explained by the renormalization group evolution of
$\mu_4(Q^2)$ and $a_0(Q^2)$. As the main result, a good quantitative
description of all the Jefferson Lab data sets down to $Q \simeq 350 MeV is
achieved.
|
[
{
"created": "Tue, 17 Nov 2009 13:05:39 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Feb 2010 17:56:24 GMT",
"version": "v2"
}
] |
2010-05-12
|
[
[
"Pasechnik",
"Roman S.",
""
],
[
"Shirkov",
"Dmitry V.",
""
],
[
"Teryaev",
"Oleg V.",
""
],
[
"Solovtsova",
"Olga P.",
""
],
[
"Khandramai",
"Vyacheslav L.",
""
]
] |
The interplay between higher orders of the perturbative QCD (pQCD) expansion and higher-twist contributions in the analysis of recent Jefferson Lab data on the lowest moment of the spin-dependent proton $\Gamma_1^{p} (Q^2)$ at $0.05<Q^2< 3 {\rm GeV}^2$ is studied. We demonstrate that the values of the higher-twist coefficients $\mu^{p,n}_{2k} $ extracted from the data by using the singularity-free analytic perturbation theory provide a better convergence of the higher-twist series than with the standard perturbative QCD. From the high-precision proton data, we extract the value of the singlet axial charge $a_0(1 {\rm GeV}^2)=0.33\pm0.05$. We observe a slow $Q^2$ dependence of fitted values of the twist coefficient $\mu_4$ and $a_0$ when going to lower energy scales, which can be explained by the renormalization group evolution of $\mu_4(Q^2)$ and $a_0(Q^2)$. As the main result, a good quantitative description of all the Jefferson Lab data sets down to $Q \simeq 350 MeV is achieved.
|
hep-ph/0312019
|
Pietro Faccioli
|
P. Faccioli (E.C.T.)
|
Instanton Contribution to the Electro-Magnetic Form Factors of the
Nucleon
|
Final version to appear on Phys. Rev. C
|
Phys.Rev. C69 (2004) 065211
|
10.1103/PhysRevC.69.065211
| null |
hep-ph
| null |
We study the electro-magnetic form factors of the nucleon, from small to
large momentum transfer, in the context of the Instanton Liquid Model (ILM). As
a first step, we analyze the role of single-instanton effects, and show that
they dominate the form factors at large momentum transfer. Then, we go beyond
the single-instanton approximation and perform a calculation to all order in
the 't Hooft interaction. We find that the ILM is in good agreement with the
available experimental data. Based on these results, we argue that instantons
provide a microscopic mechanism that explains the delay of the onset of the
asymptotic perturbative regime, in the electro-magnetic form factors.
|
[
{
"created": "Mon, 1 Dec 2003 15:26:11 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Apr 2004 12:39:34 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Faccioli",
"P.",
"",
"E.C.T."
]
] |
We study the electro-magnetic form factors of the nucleon, from small to large momentum transfer, in the context of the Instanton Liquid Model (ILM). As a first step, we analyze the role of single-instanton effects, and show that they dominate the form factors at large momentum transfer. Then, we go beyond the single-instanton approximation and perform a calculation to all order in the 't Hooft interaction. We find that the ILM is in good agreement with the available experimental data. Based on these results, we argue that instantons provide a microscopic mechanism that explains the delay of the onset of the asymptotic perturbative regime, in the electro-magnetic form factors.
|
2103.04024
|
Paul E. Reimer
|
J. Dove, B. Kerns, R. E. McClellan, S. Miyasaka, D. H. Morton, K.
Nagai, S. Prasad, F. Sanftl, M. B. C. Scott, A. S. Tadepalli, C. A. Aidala,
J. Arrington, C. Ayuso, C. L. Barker, C. N. Brown, W.C. Chang, A. Chen, D. C.
Christian, B. P. Dannowitz, M. Daugherity, M. Diefenthaler, L. El Fassi, D.
F. Geesaman, R. Gilman, Y. Goto, L. Guo, R. Guo, T. J. Hague, R. J. Holt, D.
Isenhower, E. R. Kinney, N. Kitts, A. Klein, D. W. Kleinjan, Y. Kudo, C.
Leung, P.-J. Lin, K. Liu, M. X. Liu, W. Lorenzon, N. C. R. Makins, M.
Mesquita de Medeiros, P. L. McGaughey, Y. Miyachi, I. Mooney, K. Nakahara, K.
Nakano, S. Nara, J.-C. Peng, A. J. Puckett, B. J. Ramson, P. E. Reimer, J. G.
Rubin, S. Sawada, T. Sawada, T.-A. Shibata, D. Su, M. Teo, B. G Tice, R. S.
Towell, S. Uemura, S. Watson, S. G. Wang, A. B. Wickes, J. Wu, Z. Xi, Z. Ye
|
The Asymmetry of Antimatter in the Proton
|
10 pages, 5 figures, 5 tables; Matches published version
|
Nature, 590, 561-565 (2021)
|
10.1038/s41586-021-03282-z
|
FERMILAB-PUB-21-073-E
|
hep-ph hep-ex nucl-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The fundamental building blocks of the proton, quarks and gluons, have been
known for decades. However, we still have an incomplete theoretical and
experimental understanding of how these particles and their dynamics give rise
to the quantum bound state of the proton and its physical properties, such as
for example its spin. The two up and the single down quarks that comprise the
proton in the simplest picture account only for a few percent of the proton
mass, the bulk of which is in the form of quark kinetic and potential energy
and gluon energy from the strong force. An essential feature of this force, as
described by quantum chromodynamics, is its ability to create matter-antimatter
quark pairs inside the proton that exist only for a very short time. Their
fleeting existence makes the antimatter quarks within protons difficult to
study, but their existence is discernible in reactions where a
matter-antimatter quark pair annihilates. In this picture of quark-antiquark
creation by the strong force, the probability distributions as a function of
momentum for the presence of up and down antimatter quarks should be nearly
identical, since their masses are quite similar and small compared to the mass
of the proton. In the present manuscript, we show evidence from muon pair
production measurements that these distributions are significantly different,
with more abundant down antimatter quarks than up antimatter quarks over a wide
range of momentum. These results revive interest in several proposed mechanisms
as the origin of this antimatter asymmetry in the proton that had been
disfavored by the previous results and point to the future measurements that
can distinguish between these mechanisms.
|
[
{
"created": "Sat, 6 Mar 2021 04:35:20 GMT",
"version": "v1"
}
] |
2021-03-09
|
[
[
"Dove",
"J.",
""
],
[
"Kerns",
"B.",
""
],
[
"McClellan",
"R. E.",
""
],
[
"Miyasaka",
"S.",
""
],
[
"Morton",
"D. H.",
""
],
[
"Nagai",
"K.",
""
],
[
"Prasad",
"S.",
""
],
[
"Sanftl",
"F.",
""
],
[
"Scott",
"M. B. C.",
""
],
[
"Tadepalli",
"A. S.",
""
],
[
"Aidala",
"C. A.",
""
],
[
"Arrington",
"J.",
""
],
[
"Ayuso",
"C.",
""
],
[
"Barker",
"C. L.",
""
],
[
"Brown",
"C. N.",
""
],
[
"Chang",
"W. C.",
""
],
[
"Chen",
"A.",
""
],
[
"Christian",
"D. C.",
""
],
[
"Dannowitz",
"B. P.",
""
],
[
"Daugherity",
"M.",
""
],
[
"Diefenthaler",
"M.",
""
],
[
"Fassi",
"L. El",
""
],
[
"Geesaman",
"D. F.",
""
],
[
"Gilman",
"R.",
""
],
[
"Goto",
"Y.",
""
],
[
"Guo",
"L.",
""
],
[
"Guo",
"R.",
""
],
[
"Hague",
"T. J.",
""
],
[
"Holt",
"R. J.",
""
],
[
"Isenhower",
"D.",
""
],
[
"Kinney",
"E. R.",
""
],
[
"Kitts",
"N.",
""
],
[
"Klein",
"A.",
""
],
[
"Kleinjan",
"D. W.",
""
],
[
"Kudo",
"Y.",
""
],
[
"Leung",
"C.",
""
],
[
"Lin",
"P. -J.",
""
],
[
"Liu",
"K.",
""
],
[
"Liu",
"M. X.",
""
],
[
"Lorenzon",
"W.",
""
],
[
"Makins",
"N. C. R.",
""
],
[
"de Medeiros",
"M. Mesquita",
""
],
[
"McGaughey",
"P. L.",
""
],
[
"Miyachi",
"Y.",
""
],
[
"Mooney",
"I.",
""
],
[
"Nakahara",
"K.",
""
],
[
"Nakano",
"K.",
""
],
[
"Nara",
"S.",
""
],
[
"Peng",
"J. -C.",
""
],
[
"Puckett",
"A. J.",
""
],
[
"Ramson",
"B. J.",
""
],
[
"Reimer",
"P. E.",
""
],
[
"Rubin",
"J. G.",
""
],
[
"Sawada",
"S.",
""
],
[
"Sawada",
"T.",
""
],
[
"Shibata",
"T. -A.",
""
],
[
"Su",
"D.",
""
],
[
"Teo",
"M.",
""
],
[
"Tice",
"B. G",
""
],
[
"Towell",
"R. S.",
""
],
[
"Uemura",
"S.",
""
],
[
"Watson",
"S.",
""
],
[
"Wang",
"S. G.",
""
],
[
"Wickes",
"A. B.",
""
],
[
"Wu",
"J.",
""
],
[
"Xi",
"Z.",
""
],
[
"Ye",
"Z.",
""
]
] |
The fundamental building blocks of the proton, quarks and gluons, have been known for decades. However, we still have an incomplete theoretical and experimental understanding of how these particles and their dynamics give rise to the quantum bound state of the proton and its physical properties, such as for example its spin. The two up and the single down quarks that comprise the proton in the simplest picture account only for a few percent of the proton mass, the bulk of which is in the form of quark kinetic and potential energy and gluon energy from the strong force. An essential feature of this force, as described by quantum chromodynamics, is its ability to create matter-antimatter quark pairs inside the proton that exist only for a very short time. Their fleeting existence makes the antimatter quarks within protons difficult to study, but their existence is discernible in reactions where a matter-antimatter quark pair annihilates. In this picture of quark-antiquark creation by the strong force, the probability distributions as a function of momentum for the presence of up and down antimatter quarks should be nearly identical, since their masses are quite similar and small compared to the mass of the proton. In the present manuscript, we show evidence from muon pair production measurements that these distributions are significantly different, with more abundant down antimatter quarks than up antimatter quarks over a wide range of momentum. These results revive interest in several proposed mechanisms as the origin of this antimatter asymmetry in the proton that had been disfavored by the previous results and point to the future measurements that can distinguish between these mechanisms.
|
hep-ph/9903487
|
Jacques Dumarchez
|
F. Vannucci
|
Can LSND and SuperKamiokande be explained by radiative decays of
muons-neutrinos?
|
4 pages, 0 figure
| null | null |
LPNHEP-99-03
|
hep-ph
| null |
The radiative decay of muon-neutrinos in matter with a scheme of
mass-degenerate neutrinos could be the common origin of the appearance of
anti-electron-neutrinos at LSND and the disappearance of muons-neutrinos at
SuperKamiokande. With the decay probability fixed by the LSND signal, the
deficit of atmospheric neutrinos can be satisfactorily reproduced.
|
[
{
"created": "Thu, 25 Mar 1999 10:45:02 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Vannucci",
"F.",
""
]
] |
The radiative decay of muon-neutrinos in matter with a scheme of mass-degenerate neutrinos could be the common origin of the appearance of anti-electron-neutrinos at LSND and the disappearance of muons-neutrinos at SuperKamiokande. With the decay probability fixed by the LSND signal, the deficit of atmospheric neutrinos can be satisfactorily reproduced.
|
2103.06485
|
Chung-Lin Shan
|
Chung-Lin Shan
|
Monte Carlo Scattering-by-Scattering Simulation of 3-Dimensional Elastic
WIMP-Nucleus Scattering Events
|
30 pages. arXiv admin note: text overlap with arXiv:1905.11279
| null | null | null |
hep-ph astro-ph.IM
|
http://creativecommons.org/licenses/by-sa/4.0/
|
In this paper, as the first part of the third step of our study on developing
data analysis procedures for using 3-dimensional information offered by
directional direct Dark Matter detection experiments in the future, we present
our double-Monte Carlo "scattering-by-scattering" simulation of the
3-dimensional elastic WIMP-nucleus scattering process, which can provide 3-D
velocity information (the magnitude, the direction, and the incoming/scattering
time) of each incident halo WIMP as well as the recoil direction and the recoil
energy of the scattered target nucleus in different celestial coordinate
systems. For readers' reference, (animated) simulation plots with different
WIMP masses and several frequently used target nuclei for all functionable
underground laboratories can be found and downloaded on our online
(interactive) demonstration webpage (http://www.tir.tw/phys/hep/dm/amidas-2d/).
|
[
{
"created": "Thu, 11 Mar 2021 06:17:59 GMT",
"version": "v1"
}
] |
2021-03-12
|
[
[
"Shan",
"Chung-Lin",
""
]
] |
In this paper, as the first part of the third step of our study on developing data analysis procedures for using 3-dimensional information offered by directional direct Dark Matter detection experiments in the future, we present our double-Monte Carlo "scattering-by-scattering" simulation of the 3-dimensional elastic WIMP-nucleus scattering process, which can provide 3-D velocity information (the magnitude, the direction, and the incoming/scattering time) of each incident halo WIMP as well as the recoil direction and the recoil energy of the scattered target nucleus in different celestial coordinate systems. For readers' reference, (animated) simulation plots with different WIMP masses and several frequently used target nuclei for all functionable underground laboratories can be found and downloaded on our online (interactive) demonstration webpage (http://www.tir.tw/phys/hep/dm/amidas-2d/).
|
1410.7097
|
Mikhail Zubkov Dr
|
G.E. Volovik, M.A. Zubkov
|
Scalar excitation with Leggett frequency in $^3$ He-B and the $125$ GeV
Higgs particle in top quark condensation models as Pseudo - Goldstone bosons
|
Latex, 33 pages
|
Phys. Rev. D 92, 055004 (2015)
|
10.1103/PhysRevD.92.055004
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the scenario, in which the light Higgs scalar boson appears as
the Pseudo - Goldstone boson. We discuss examples both in condensed matter and
in relativistic field theory. In $^3$He-B the symmetry breaking gives rise to 4
Nambu-Goldstone modes and 14 Higgs modes. At lower energy one of the four NG
modes becomes the Higgs boson with small mass. This is the mode measured in
experiments with the longitudinal NMR, and the Higgs mass corresponds to the
Leggett frequency $M_{\rm H}=\hbar \Omega_L$. The formation of the Higgs mass
is the result of the violation of the hidden spin-orbit symmetry at low energy.
In this scenario the symmetry breaking energy scale $\Delta$ (the gap in the
fermionic spectrum) and the Higgs mass scale $M_{\rm H}$ are highly separated:
$M_{\rm H}\ll \Delta$. On the particle physics side we consider the model
inspired by the models of \cite{dobrescu,Yamawaki}. At high energies the
$SU(3)$ symmetry is assumed that relates the left - handed top and bottom
quarks to the additional fermion $\chi_L$. This symmetry is softly broken at
low energies. As a result the only CP - even Goldstone boson acquires a mass
and may be considered as the candidate for the role of the $125$ GeV scalar
boson. We consider the condensation pattern different from the one typical for
the top - seesaw models, where the condensate $< \bar{t}_L\chi_R >$ is off -
diagonal. In our case the condensates are mostly diagonal. Unlike
\cite{dobrescu,Yamawaki} the explicit mass terms are absent and the soft
breaking of $SU(3)$ symmetry is given solely by the four - fermion terms. This
reveals the complete analogy with $^3$He, where there is no explicit mass term
and the spin - orbit interaction has the form of the four - fermion
interaction.
|
[
{
"created": "Sun, 26 Oct 2014 23:37:18 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Nov 2014 18:39:24 GMT",
"version": "v2"
},
{
"created": "Sun, 12 Jul 2015 16:46:23 GMT",
"version": "v3"
}
] |
2015-09-07
|
[
[
"Volovik",
"G. E.",
""
],
[
"Zubkov",
"M. A.",
""
]
] |
We consider the scenario, in which the light Higgs scalar boson appears as the Pseudo - Goldstone boson. We discuss examples both in condensed matter and in relativistic field theory. In $^3$He-B the symmetry breaking gives rise to 4 Nambu-Goldstone modes and 14 Higgs modes. At lower energy one of the four NG modes becomes the Higgs boson with small mass. This is the mode measured in experiments with the longitudinal NMR, and the Higgs mass corresponds to the Leggett frequency $M_{\rm H}=\hbar \Omega_L$. The formation of the Higgs mass is the result of the violation of the hidden spin-orbit symmetry at low energy. In this scenario the symmetry breaking energy scale $\Delta$ (the gap in the fermionic spectrum) and the Higgs mass scale $M_{\rm H}$ are highly separated: $M_{\rm H}\ll \Delta$. On the particle physics side we consider the model inspired by the models of \cite{dobrescu,Yamawaki}. At high energies the $SU(3)$ symmetry is assumed that relates the left - handed top and bottom quarks to the additional fermion $\chi_L$. This symmetry is softly broken at low energies. As a result the only CP - even Goldstone boson acquires a mass and may be considered as the candidate for the role of the $125$ GeV scalar boson. We consider the condensation pattern different from the one typical for the top - seesaw models, where the condensate $< \bar{t}_L\chi_R >$ is off - diagonal. In our case the condensates are mostly diagonal. Unlike \cite{dobrescu,Yamawaki} the explicit mass terms are absent and the soft breaking of $SU(3)$ symmetry is given solely by the four - fermion terms. This reveals the complete analogy with $^3$He, where there is no explicit mass term and the spin - orbit interaction has the form of the four - fermion interaction.
|
hep-ph/9609229
| null |
V.L. Eletsky and B.L. Ioffe (ITEP, Moscow)
|
Meson Masses in Nuclear Matter
|
11 pages, REVTEX, one figure available from the authors upon request
|
Phys.Rev.Lett. 78 (1997) 1010-1013
|
10.1103/PhysRevLett.78.1010
| null |
hep-ph nucl-th
| null |
Mass shifts $\Delta m$ of particles in nuclear matter relative to their
vacuum values are considered. A general formula relating $\Delta m(E)$ ($E$ is
the particle energy) to the real part of the forward particle-nucleon
scattering amplitude ${\rm Re} f(E)$ is presented and its applicability domain
is formulated. The $\rho$-meson mass shift in nuclear matter is calculated at
$2\la E_{\rho}\la 7$ GeV for transversally and longitudinally polarized
$\rho$-mesons with the results: $\Delta m_{\rho}^T \sim 50$ MeV and $\Delta
m_{\rho}^L \sim 10$ MeV at normal nuclear density.
|
[
{
"created": "Mon, 2 Sep 1996 17:37:43 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Eletsky",
"V. L.",
"",
"ITEP, Moscow"
],
[
"Ioffe",
"B. L.",
"",
"ITEP, Moscow"
]
] |
Mass shifts $\Delta m$ of particles in nuclear matter relative to their vacuum values are considered. A general formula relating $\Delta m(E)$ ($E$ is the particle energy) to the real part of the forward particle-nucleon scattering amplitude ${\rm Re} f(E)$ is presented and its applicability domain is formulated. The $\rho$-meson mass shift in nuclear matter is calculated at $2\la E_{\rho}\la 7$ GeV for transversally and longitudinally polarized $\rho$-mesons with the results: $\Delta m_{\rho}^T \sim 50$ MeV and $\Delta m_{\rho}^L \sim 10$ MeV at normal nuclear density.
|
0705.2909
|
Cai-Dian Lu
|
Cai-Dian Lu, Wei Wang and Yu-Ming Wang (IHEP, Beijing)
|
Lepton flavor violating processes in unparticle physics
|
8 pages, revtex4,with 2 figures, to appear in Phys. Rev. D
|
Phys.Rev.D76:077701,2007
|
10.1103/PhysRevD.76.077701
| null |
hep-ph
| null |
We study the virtual effects of unparticle physics in the lepton flavor
violating processes $M^0\to l^+l'^-$ and $e^+e^-\to l^+l'^-$ scattering, where
$M^0$ denotes the pseudoscalar mesons: $\pi^0,K_L, D_0,B_0,B_s^0$ and $l,l'$
denote two different lepton flavors. For the decay of $B^0\to l^+l'^-$, there
is no constraint from the current experimental upper bounds on the vector
unparticle coupling with leptons. The constraint on the coupling constant
between scalar unparticle field and leptons is sensitive to the scaling
dimension of the unparticle $d_{\cal U}$. For the scattering process $e^-e^+\to
l^-l'^+$, there is only constraint from experiments on the vector unparticle
couplings with leptons but no constraint on the scalar unparticle. We study the
$\sqrt s$ dependence of the cross section $ \frac{1}{\sigma}
\frac{d\sigma}{d\sqrt s}$ of $e^+e^-\to l^-l'^+$ with different values of
$d_{\cal U}$. If $d_{\cal U}=1.5$, the cross section is independent on the
center mass energy. For $d_{\cal U}>1.5$, the cross section increases with
$\sqrt s$.
|
[
{
"created": "Mon, 21 May 2007 03:49:30 GMT",
"version": "v1"
},
{
"created": "Thu, 24 May 2007 13:23:57 GMT",
"version": "v2"
},
{
"created": "Sun, 22 Jul 2007 20:56:26 GMT",
"version": "v3"
},
{
"created": "Mon, 3 Sep 2007 07:52:32 GMT",
"version": "v4"
}
] |
2008-11-26
|
[
[
"Lu",
"Cai-Dian",
"",
"IHEP, Beijing"
],
[
"Wang",
"Wei",
"",
"IHEP, Beijing"
],
[
"Wang",
"Yu-Ming",
"",
"IHEP, Beijing"
]
] |
We study the virtual effects of unparticle physics in the lepton flavor violating processes $M^0\to l^+l'^-$ and $e^+e^-\to l^+l'^-$ scattering, where $M^0$ denotes the pseudoscalar mesons: $\pi^0,K_L, D_0,B_0,B_s^0$ and $l,l'$ denote two different lepton flavors. For the decay of $B^0\to l^+l'^-$, there is no constraint from the current experimental upper bounds on the vector unparticle coupling with leptons. The constraint on the coupling constant between scalar unparticle field and leptons is sensitive to the scaling dimension of the unparticle $d_{\cal U}$. For the scattering process $e^-e^+\to l^-l'^+$, there is only constraint from experiments on the vector unparticle couplings with leptons but no constraint on the scalar unparticle. We study the $\sqrt s$ dependence of the cross section $ \frac{1}{\sigma} \frac{d\sigma}{d\sqrt s}$ of $e^+e^-\to l^-l'^+$ with different values of $d_{\cal U}$. If $d_{\cal U}=1.5$, the cross section is independent on the center mass energy. For $d_{\cal U}>1.5$, the cross section increases with $\sqrt s$.
|
0907.2938
|
Joaquim Prades
|
Joaquim Prades (Granada)
|
The Hadronic Light-by-Light Contribution to Muon g-2: A Short Review
|
13 pages, 3 figures. Invited talk given at "Photon09, International
Conference on the Structure and Interactions of the Photon" May 11-15 2009,
DESY, Hamburg, Germany
| null | null |
CAFPE-120/09; UG-FT-250/09
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I review the recent calculations and current status of the hadronic
light-by-light scattering contribution to muon g-2. In particular, I discuss
the main results obtained in a recent work together with Eduardo de Rafael and
Arkady Vainshtein where we came to the estimate a^{\rm HLbL}_\mu = (10.5 +-
2.6) x 10^{-10}. How the two-photon physics program of low energy facilities
can help to reduce the present model dependence is also emphasized.
|
[
{
"created": "Thu, 16 Jul 2009 21:54:34 GMT",
"version": "v1"
}
] |
2009-07-20
|
[
[
"Prades",
"Joaquim",
"",
"Granada"
]
] |
I review the recent calculations and current status of the hadronic light-by-light scattering contribution to muon g-2. In particular, I discuss the main results obtained in a recent work together with Eduardo de Rafael and Arkady Vainshtein where we came to the estimate a^{\rm HLbL}_\mu = (10.5 +- 2.6) x 10^{-10}. How the two-photon physics program of low energy facilities can help to reduce the present model dependence is also emphasized.
|
hep-ph/9407282
|
Sergei Voloshin
|
S. Voloshin and Y. Zhang
|
Flow Study in Relativistic Nuclear Collisions by Fourier Expansion of
Azimuthal Particle Distributions
|
14 pages, 3 figures included as figures.uu at the end, REVTEX
|
Z.Phys.C70:665-672,1996
|
10.1007/s002880050141
| null |
hep-ph
| null |
We propose a new method to study transverse flow effects in relativistic
nuclear collisions by Fourier analysis of the azimuthal distribution on an
event-by-event basis in relatively narrow rapidity windows. The distributions
of Fourier coefficients provide direct information on the magnitude and type of
flow. Directivity and two dimensional sphericity tensor, widely used to analyze
flow, emerge naturally in our approach, since they correspond to the
distributions of the first and second harmonic coefficients, respectively. The
role of finite particle fluctuations and particle correlations is discussed.
|
[
{
"created": "Tue, 12 Jul 1994 15:53:48 GMT",
"version": "v1"
}
] |
2011-05-05
|
[
[
"Voloshin",
"S.",
""
],
[
"Zhang",
"Y.",
""
]
] |
We propose a new method to study transverse flow effects in relativistic nuclear collisions by Fourier analysis of the azimuthal distribution on an event-by-event basis in relatively narrow rapidity windows. The distributions of Fourier coefficients provide direct information on the magnitude and type of flow. Directivity and two dimensional sphericity tensor, widely used to analyze flow, emerge naturally in our approach, since they correspond to the distributions of the first and second harmonic coefficients, respectively. The role of finite particle fluctuations and particle correlations is discussed.
|
2010.15887
|
Robert Jaffe
|
Robert L. Jaffe
|
Ambiguities in the definition of local spatial densities in light
hadrons
|
8 pages, 4 figures; further minor edits, citations added
|
Phys. Rev. D 103, 016017 (2021)
|
10.1103/PhysRevD.103.016017
|
MIT-CTP/5253
|
hep-ph hep-lat nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The relationship between the matrix element of a local operator and the
Fourier transform of the associated form factor fails for systems such as the
nucleon where its intrinsic size is of order its Compton wavelength. Although
one can conceive of an intrinsic charge density distribution in the proton,
there does not seem to be an unambiguous way to define, compute, or measure it
precisely.
|
[
{
"created": "Thu, 29 Oct 2020 18:55:23 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Nov 2020 15:21:45 GMT",
"version": "v2"
},
{
"created": "Sat, 28 Nov 2020 17:44:48 GMT",
"version": "v3"
}
] |
2021-02-03
|
[
[
"Jaffe",
"Robert L.",
""
]
] |
The relationship between the matrix element of a local operator and the Fourier transform of the associated form factor fails for systems such as the nucleon where its intrinsic size is of order its Compton wavelength. Although one can conceive of an intrinsic charge density distribution in the proton, there does not seem to be an unambiguous way to define, compute, or measure it precisely.
|
hep-ph/9805349
|
Marcela Carena
|
M. Carena, P.H. Chankowski, S. Pokorski and C.E.M. Wagner
|
The Higgs Boson Mass as a Probe of the Minimal Supersymmetric Standard
Model
|
15 pages, 5 figures, LateX, psfig
|
Phys.Lett.B441:205-214,1998
|
10.1016/S0370-2693(98)01163-0
|
CERN-TH/98-148, FERMILAB-PUB--98/146-T, IFT--98/23
|
hep-ph
| null |
Recently, the LEP collaborations have reported a lower bound on a Standard
Model-like Higgs boson of order 89 GeV. We discuss the implications of this
bound for the minimal supersymmetric extension of the Standard Model (MSSM). In
particular, we show that the lower bound on $\tan\beta$, which can be obtained
from the presently allowed Higgs boson mass value, becomes stronger than the
one set by the requirement of perturbative consistency of the theory up to
scales of order $M_{GUT}$ (associated with the infrared fixed-point solution of
the top quark Yukawa coupling) in a large fraction of the allowed parameter
space. The potentiality of future LEP2 searches to further probe the MSSM
parameter space is also discussed.
|
[
{
"created": "Mon, 18 May 1998 00:50:14 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Carena",
"M.",
""
],
[
"Chankowski",
"P. H.",
""
],
[
"Pokorski",
"S.",
""
],
[
"Wagner",
"C. E. M.",
""
]
] |
Recently, the LEP collaborations have reported a lower bound on a Standard Model-like Higgs boson of order 89 GeV. We discuss the implications of this bound for the minimal supersymmetric extension of the Standard Model (MSSM). In particular, we show that the lower bound on $\tan\beta$, which can be obtained from the presently allowed Higgs boson mass value, becomes stronger than the one set by the requirement of perturbative consistency of the theory up to scales of order $M_{GUT}$ (associated with the infrared fixed-point solution of the top quark Yukawa coupling) in a large fraction of the allowed parameter space. The potentiality of future LEP2 searches to further probe the MSSM parameter space is also discussed.
|
hep-ph/0411311
|
Atsushi Hosaka
|
A. Hosaka, T. Hyodo, F.J. Llanes-Estrada, E. Oset, J.R. Pelaez, M.J.
Vicente Vacas
|
Two-meson cloud contribution to the baryon antidecuplet binding
|
13 pages, To appear in Phys. Rev. C
|
Phys.Rev.C71:045205,2005
|
10.1103/PhysRevC.71.045205
|
RCNP-Th04032
|
hep-ph
| null |
We study the two-meson virtual cloud contribution to the self-energy of the
SU(3) antidecuplet, to which the Theta+ pentaquark is assumed to belong. This
is motivated by the large branching ratio of the N(1710) decay into two pions
and one nucleon. We derive effective Lagrangians that describe the N(1710)
decay into N-pi-pi with two pions in s or p wave. We obtain increased binding
for all members of the antidecuplet and a contribution to the mass splitting
between states with different strangeness which is at least 20 % of the
empirical one. We also provide predictions for three-body decays of the
pentaquark antidecuplet.
|
[
{
"created": "Tue, 23 Nov 2004 18:58:28 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Apr 2005 02:09:26 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Hosaka",
"A.",
""
],
[
"Hyodo",
"T.",
""
],
[
"Llanes-Estrada",
"F. J.",
""
],
[
"Oset",
"E.",
""
],
[
"Pelaez",
"J. R.",
""
],
[
"Vacas",
"M. J. Vicente",
""
]
] |
We study the two-meson virtual cloud contribution to the self-energy of the SU(3) antidecuplet, to which the Theta+ pentaquark is assumed to belong. This is motivated by the large branching ratio of the N(1710) decay into two pions and one nucleon. We derive effective Lagrangians that describe the N(1710) decay into N-pi-pi with two pions in s or p wave. We obtain increased binding for all members of the antidecuplet and a contribution to the mass splitting between states with different strangeness which is at least 20 % of the empirical one. We also provide predictions for three-body decays of the pentaquark antidecuplet.
|
0905.0107
|
Pearl Sandick
|
John Ellis, Keith A. Olive and Pearl Sandick
|
Update on the Direct Detection of Dark Matter in MSSM Models with
Non-Universal Higgs Masses
|
35 pages, 14 figures, submitted to New Journal of Physics focus issue
"Dark Matter and Particle Physics"
|
New J.Phys.11:105015,2009
|
10.1088/1367-2630/11/10/105015
|
CERN-PH-TH/2009-053, UMN-TH-2746/09, FTPI-MINN-09/18, UTTG-03-09,
TCC-017-09
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the possibilities for the direct detection of neutralino dark
matter via elastic scattering in variants of the minimal supersymmetric
extension of the Standard Model (MSSM) with non-universal
supersymmetry-breaking contributions to the Higgs masses, which may be either
equal (NUHM1) or independent (NUHM2). We compare the ranges found in the NUHM1
and NUHM2 with that found in the MSSM with universal supersymmetry-breaking
contributions to all scalar masses, the CMSSM. We find that both the NUHM1 and
NUHM2 offer the possibility of larger spin-independent dark matter scattering
cross sections than in the CMSSM for larger neutralino masses, since they allow
the density of heavier neutralinos with large Higgsino components to fall
within the allowed range by astrophysics. The NUHM1 and NUHM2 also offer more
possibilities than the CMSSM for small cross sections for lower neutralino
masses, since they may be suppressed by scalar and pseudoscalar Higgs masses
that are larger than in the CMSSM.
|
[
{
"created": "Fri, 1 May 2009 15:51:50 GMT",
"version": "v1"
}
] |
2010-04-28
|
[
[
"Ellis",
"John",
""
],
[
"Olive",
"Keith A.",
""
],
[
"Sandick",
"Pearl",
""
]
] |
We discuss the possibilities for the direct detection of neutralino dark matter via elastic scattering in variants of the minimal supersymmetric extension of the Standard Model (MSSM) with non-universal supersymmetry-breaking contributions to the Higgs masses, which may be either equal (NUHM1) or independent (NUHM2). We compare the ranges found in the NUHM1 and NUHM2 with that found in the MSSM with universal supersymmetry-breaking contributions to all scalar masses, the CMSSM. We find that both the NUHM1 and NUHM2 offer the possibility of larger spin-independent dark matter scattering cross sections than in the CMSSM for larger neutralino masses, since they allow the density of heavier neutralinos with large Higgsino components to fall within the allowed range by astrophysics. The NUHM1 and NUHM2 also offer more possibilities than the CMSSM for small cross sections for lower neutralino masses, since they may be suppressed by scalar and pseudoscalar Higgs masses that are larger than in the CMSSM.
|
2306.15480
|
Giang Bui Thi Ha
|
Bui Thi Ha Giang
|
The $\gamma b\overline{b}$ production via $\gamma^{*}\gamma^{*}$
collisions at the ILC and LHC
|
11 pages, 4 figures, 4 tables
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Taking into account of the mixing of Higgs-radion in the Randall-Sundrum
model and the vector anomalous couplings, we investigate the production of
$b\overline{b}$ associated with the photon through $\gamma^{*}\gamma^{*}$
collisions at the International Linear Collider (ILC) and Large Hadron Collider
(LHC). The total cross-section depends strongly on the vacuum expectation value
(VEV) of the radion field $\Lambda_{\phi}$, the radion mass $m_{\phi}$, the
parameters of anomalous couplings. The result shows that the total
cross-section in $\gamma b\overline{b}$ production at the LHC is much larger
than that at the ILC. The production cross-section gives the largest value at
the dominated state, $m_{\phi} = m_{h} = 125$ GeV.
|
[
{
"created": "Tue, 27 Jun 2023 13:57:24 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Sep 2023 13:47:01 GMT",
"version": "v2"
}
] |
2023-09-27
|
[
[
"Giang",
"Bui Thi Ha",
""
]
] |
Taking into account of the mixing of Higgs-radion in the Randall-Sundrum model and the vector anomalous couplings, we investigate the production of $b\overline{b}$ associated with the photon through $\gamma^{*}\gamma^{*}$ collisions at the International Linear Collider (ILC) and Large Hadron Collider (LHC). The total cross-section depends strongly on the vacuum expectation value (VEV) of the radion field $\Lambda_{\phi}$, the radion mass $m_{\phi}$, the parameters of anomalous couplings. The result shows that the total cross-section in $\gamma b\overline{b}$ production at the LHC is much larger than that at the ILC. The production cross-section gives the largest value at the dominated state, $m_{\phi} = m_{h} = 125$ GeV.
|
1412.4821
|
Russell Kirk
|
Mark Hindmarsh, Russell Kirk, Jose Miguel No and Stephen M. West
|
Dark Matter with Topological Defects in the Inert Doublet Model
|
27 pages, 3 figures. V2: Published version with references added
| null |
10.1088/1475-7516/2015/05/048
| null |
hep-ph astro-ph.CO astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We examine the production of dark matter by decaying topological defects in
the high mass region $m_{\mathrm{DM}} \gg m_W$ of the Inert Doublet Model,
extended with an extra U(1) gauge symmetry. The density of dark matter states
(the neutral Higgs states of the inert doublet) is determined by the interplay
of the freeze-out mechanism and the additional production of dark matter states
from the decays of topological defects, in this case cosmic strings. These
decays increase the predicted relic abundance compared to the standard
freeze-out only case, and as a consequence the viable parameter space of the
Inert Doublet Model can be widened substantially. In particular, for a given
dark matter annihilation rate lower dark matter masses become viable. We
investigate the allowed mass range taking into account constraints on the
energy injection rate from the diffuse $\gamma$-ray background and Big Bang
Nucleosynthesis, together with constraints on the dark matter properties coming
from direct and indirect detection limits. For the Inert Doublet Model
high-mass region, an inert Higgs mass as low as $\sim 200$ GeV is permitted.
There is also an upper limit on string mass per unit length, and hence the
symmetry breaking scale, from the relic abundance in this scenario. Depending
on assumptions made about the string decays, the limits are in the range
$10^{12}$ GeV to $10^{13}$ GeV.
|
[
{
"created": "Mon, 15 Dec 2014 22:09:37 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jul 2015 14:14:41 GMT",
"version": "v2"
}
] |
2015-07-30
|
[
[
"Hindmarsh",
"Mark",
""
],
[
"Kirk",
"Russell",
""
],
[
"No",
"Jose Miguel",
""
],
[
"West",
"Stephen M.",
""
]
] |
We examine the production of dark matter by decaying topological defects in the high mass region $m_{\mathrm{DM}} \gg m_W$ of the Inert Doublet Model, extended with an extra U(1) gauge symmetry. The density of dark matter states (the neutral Higgs states of the inert doublet) is determined by the interplay of the freeze-out mechanism and the additional production of dark matter states from the decays of topological defects, in this case cosmic strings. These decays increase the predicted relic abundance compared to the standard freeze-out only case, and as a consequence the viable parameter space of the Inert Doublet Model can be widened substantially. In particular, for a given dark matter annihilation rate lower dark matter masses become viable. We investigate the allowed mass range taking into account constraints on the energy injection rate from the diffuse $\gamma$-ray background and Big Bang Nucleosynthesis, together with constraints on the dark matter properties coming from direct and indirect detection limits. For the Inert Doublet Model high-mass region, an inert Higgs mass as low as $\sim 200$ GeV is permitted. There is also an upper limit on string mass per unit length, and hence the symmetry breaking scale, from the relic abundance in this scenario. Depending on assumptions made about the string decays, the limits are in the range $10^{12}$ GeV to $10^{13}$ GeV.
|
hep-ph/0104081
|
Gubin
|
N.N. Achasov and V.V. Gubin
|
Analysis of the nature of the $\phi\to\gamma\pi\eta$ and
$\phi\to\gamma\pi^0\pi^0$ decays
|
Withdrawal
|
Phys.Rev. D63 (2001) 094007; Phys.Atom.Nucl. 65 (2002) 1528-1536
|
10.1103/PhysRevD.63.094007
| null |
hep-ph
| null |
hep-ph/0104081 was put by accident insdead of "replace hep-ph/0101024"(v2).
We apologize very much.
|
[
{
"created": "Mon, 9 Apr 2001 08:24:27 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Apr 2001 03:21:11 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Achasov",
"N. N.",
""
],
[
"Gubin",
"V. V.",
""
]
] |
hep-ph/0104081 was put by accident insdead of "replace hep-ph/0101024"(v2). We apologize very much.
|
1701.01443
|
Wouter Dekens
|
V. Cirigliano, W. Dekens, M. Graesser, and E. Mereghetti
|
Neutrinoless double beta decay and chiral $SU(3)$
|
9 pages
| null |
10.1016/j.physletb.2017.04.020
|
LA-UR-17-20043
|
hep-ph hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
TeV-scale lepton number violation can affect neutrinoless double beta decay
through dimension-9 $\Delta L= \Delta I = 2$ operators involving two electrons
and four quarks. Since the dominant effects within a nucleus are expected to
arise from pion exchange, the $ \pi^- \to \pi^+ e e$ matrix elements of the
dimension-9 operators are a key hadronic input. In this letter we provide
estimates for the $\pi^- \to \pi^+ $ matrix elements of all Lorentz scalar
$\Delta I = 2$ four-quark operators relevant to the study of TeV-scale lepton
number violation. The analysis is based on chiral $SU(3)$ symmetry, which
relates the $\pi^- \to \pi^+$ matrix elements of the $\Delta I = 2$ operators
to the $K^0 \to \bar{K}^0$ and $K \to \pi \pi$ matrix elements of their $\Delta
S = 2$ and $\Delta S = 1$ chiral partners, for which lattice QCD input is
available. The inclusion of next-to-leading order chiral loop corrections to
all symmetry relations used in the analysis makes our results robust at the
$30\%$ level or better, depending on the operator.
|
[
{
"created": "Thu, 5 Jan 2017 19:00:03 GMT",
"version": "v1"
}
] |
2017-04-19
|
[
[
"Cirigliano",
"V.",
""
],
[
"Dekens",
"W.",
""
],
[
"Graesser",
"M.",
""
],
[
"Mereghetti",
"E.",
""
]
] |
TeV-scale lepton number violation can affect neutrinoless double beta decay through dimension-9 $\Delta L= \Delta I = 2$ operators involving two electrons and four quarks. Since the dominant effects within a nucleus are expected to arise from pion exchange, the $ \pi^- \to \pi^+ e e$ matrix elements of the dimension-9 operators are a key hadronic input. In this letter we provide estimates for the $\pi^- \to \pi^+ $ matrix elements of all Lorentz scalar $\Delta I = 2$ four-quark operators relevant to the study of TeV-scale lepton number violation. The analysis is based on chiral $SU(3)$ symmetry, which relates the $\pi^- \to \pi^+$ matrix elements of the $\Delta I = 2$ operators to the $K^0 \to \bar{K}^0$ and $K \to \pi \pi$ matrix elements of their $\Delta S = 2$ and $\Delta S = 1$ chiral partners, for which lattice QCD input is available. The inclusion of next-to-leading order chiral loop corrections to all symmetry relations used in the analysis makes our results robust at the $30\%$ level or better, depending on the operator.
|
2006.02385
|
Renan Pereira
|
Renan C\^amara Pereira, Jo\~ao Moreira and Pedro Costa
|
The strange critical endpoint and isentropic trajectories in an Extended
PNJL Model with Eight Quark Interactions
|
12 pages, 3 figures
|
Eur. Phys. J. A 56, 214 (2020)
|
10.1140/epja/s10050-020-00223-8
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, we explore the possible existence of several critical endpoints
in the phase diagram of strongly interacting matter using an extended PNJL
model with 't Hooft determinant and eight quark interactions in the up, down
and strange sectors. Besides, we also study the isentropic trajectories
crossing both (light and strange) chiral phase transitions and around the
critical endpoint in both the crossover and first-order transition regions.
|
[
{
"created": "Wed, 3 Jun 2020 17:00:31 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Sep 2020 16:02:12 GMT",
"version": "v2"
}
] |
2020-09-14
|
[
[
"Pereira",
"Renan Câmara",
""
],
[
"Moreira",
"João",
""
],
[
"Costa",
"Pedro",
""
]
] |
In this work, we explore the possible existence of several critical endpoints in the phase diagram of strongly interacting matter using an extended PNJL model with 't Hooft determinant and eight quark interactions in the up, down and strange sectors. Besides, we also study the isentropic trajectories crossing both (light and strange) chiral phase transitions and around the critical endpoint in both the crossover and first-order transition regions.
|
hep-ph/0109211
|
A. K. Chaudhuri
|
A. K. Chaudhuri (VECC, Calcutta)
|
$\Theta$ vacua states in heavy ion collisions in presence of dissipation
and noise
|
6 pages, 6 figures
|
Phys.Rev. C65 (2002) 024906
|
10.1103/PhysRevC.65.024906
| null |
hep-ph nucl-th
| null |
We have studied possible formation of $\Theta$ vacua states in heavy ion
collisions. Random phases of the chiral fields were evolved in a finite
temperature potential, incorporating the breaking of $U_A(1)$ symmetry. Initial
random phases very quickly settle into oscillation around the values dictated
by the potential. The simulation study indicate that an initial $\Theta$=0
state do not evolve into a $\Theta$ $\neq$ 0 state. However, an initial
$\Theta$ $\neq$ 0 state, if formed in heavy ion collision, can survive, as a
coherent superposition of a number of modes.
|
[
{
"created": "Mon, 24 Sep 2001 06:56:28 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Chaudhuri",
"A. K.",
"",
"VECC, Calcutta"
]
] |
We have studied possible formation of $\Theta$ vacua states in heavy ion collisions. Random phases of the chiral fields were evolved in a finite temperature potential, incorporating the breaking of $U_A(1)$ symmetry. Initial random phases very quickly settle into oscillation around the values dictated by the potential. The simulation study indicate that an initial $\Theta$=0 state do not evolve into a $\Theta$ $\neq$ 0 state. However, an initial $\Theta$ $\neq$ 0 state, if formed in heavy ion collision, can survive, as a coherent superposition of a number of modes.
|
2010.09840
|
Dominic Viatic
|
Richard A. Battye, Apostolos Pilaftsis and Dominic G. Viatic
|
Domain Wall Constraints on Two Higgs Doublet Models with $Z_2$ Symmetry
|
18 pages, 6 figures
|
Phys. Rev. D 102, 123536 (2020)
|
10.1103/PhysRevD.102.123536
| null |
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Two Higgs Doublet Model (2HDM) with spontaneously broken $Z_2$ symmetry
predicts a production of domain walls at the electroweak scale. We derive
cosmological constraints on model parameters for both Type-I and Type-II 2HDMs
from the requirement that domain walls do not dominate the Universe by the
present day. For Type-I 2HDMs, we deduce the lower bound on the key parameter
$\tan\beta > 10^5$ for a wide range of Higgs-boson masses $\sim$ 100 GeV or
greater close to the Standard Model alignment limit. In addition, we perform
numerical simulations of the 2HDM with an approximate as well as an exact $Z_2$
symmetry but biased initial conditions. In both cases, we find that domain wall
networks are unstable and, hence, do not survive at late times. The domain
walls experience an exponential suppression of scaling in these models which
can help ameliorate the stringent constraints found in the case of an exact
discrete symmetry. For a 2HDM with softly-broken $Z_2$ symmetry, we relate the
size of this exponential suppression to the soft-breaking bilinear parameter
$m_{12}$ allowing limits to be placed on this parameter of order $\mu$eV, such
that domain wall domination can be avoided. In particular, for Type-II 2HDMs,
we obtain a corresponding lower limit on the CP-odd phase $\theta$ generated by
QCD instantons, $\theta \ \stackrel{>}{{}_\sim}\ 10^{-11}/(\sin\beta
\cos\beta)$, which is in some tension with the upper limit of $\theta \
\stackrel{<}{{}_\sim}\ 10^{-11}$--$10^{-10}$, as derived from the
non-observation of a non-zero neutron electric dipole moment. For a
$Z_2$-symmetric 2HDM with biased initial conditions, we are able to relate the
size of the exponential suppression to a biasing parameter $\varepsilon$ so as
to avoid domain wall domination.
|
[
{
"created": "Mon, 19 Oct 2020 20:29:00 GMT",
"version": "v1"
}
] |
2021-01-04
|
[
[
"Battye",
"Richard A.",
""
],
[
"Pilaftsis",
"Apostolos",
""
],
[
"Viatic",
"Dominic G.",
""
]
] |
The Two Higgs Doublet Model (2HDM) with spontaneously broken $Z_2$ symmetry predicts a production of domain walls at the electroweak scale. We derive cosmological constraints on model parameters for both Type-I and Type-II 2HDMs from the requirement that domain walls do not dominate the Universe by the present day. For Type-I 2HDMs, we deduce the lower bound on the key parameter $\tan\beta > 10^5$ for a wide range of Higgs-boson masses $\sim$ 100 GeV or greater close to the Standard Model alignment limit. In addition, we perform numerical simulations of the 2HDM with an approximate as well as an exact $Z_2$ symmetry but biased initial conditions. In both cases, we find that domain wall networks are unstable and, hence, do not survive at late times. The domain walls experience an exponential suppression of scaling in these models which can help ameliorate the stringent constraints found in the case of an exact discrete symmetry. For a 2HDM with softly-broken $Z_2$ symmetry, we relate the size of this exponential suppression to the soft-breaking bilinear parameter $m_{12}$ allowing limits to be placed on this parameter of order $\mu$eV, such that domain wall domination can be avoided. In particular, for Type-II 2HDMs, we obtain a corresponding lower limit on the CP-odd phase $\theta$ generated by QCD instantons, $\theta \ \stackrel{>}{{}_\sim}\ 10^{-11}/(\sin\beta \cos\beta)$, which is in some tension with the upper limit of $\theta \ \stackrel{<}{{}_\sim}\ 10^{-11}$--$10^{-10}$, as derived from the non-observation of a non-zero neutron electric dipole moment. For a $Z_2$-symmetric 2HDM with biased initial conditions, we are able to relate the size of the exponential suppression to a biasing parameter $\varepsilon$ so as to avoid domain wall domination.
|
hep-ph/9601266
|
Carlo Giunti
|
S.M. Bilenky
|
Neutrino masses and mixing
|
Latex file, 12 pages; Presented at the IInd Rencontres du Vietnam
Conference "At the Frontiers of the Standard Model", October 1995
| null | null |
SISSA Ref.10/96/EP
|
hep-ph
| null |
The status of the problem of neutrino masses and mixing is shortly reviewed.
Different schemes of mixing of (Dirac or Majorana) massive neutrinos are
considered. The theory of neutrino oscillations in vacuum and in matter is
presented. Existing indications in favor of neutrino mixing are shortly
discussed.
|
[
{
"created": "Mon, 15 Jan 1996 14:16:08 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Bilenky",
"S. M.",
""
]
] |
The status of the problem of neutrino masses and mixing is shortly reviewed. Different schemes of mixing of (Dirac or Majorana) massive neutrinos are considered. The theory of neutrino oscillations in vacuum and in matter is presented. Existing indications in favor of neutrino mixing are shortly discussed.
|
hep-ph/0611011
|
Jeppe R. Andersen
|
Jeppe R. Andersen
|
The Quark-Antiquark Contribution to the Fully Exclusive BFKL Evolution
at NLL Accuracy
|
11 pages, 3 figures
|
Phys.Rev.D74:114008,2006
|
10.1103/PhysRevD.74.114008
|
Cavendish-HEP-06/25
|
hep-ph
| null |
We calculate the quark-anti-quark contribution to the next-to-leading
logarithmic corrections to the BFKL kernel, retaining the dependence on the
momenta of the produced particles. This allows us to study the details of the
NLL corrections. We demonstrate that the standard calculation of the NLL
corrections to the scattering of two off-shell gluons includes contributions
from energies far above that which is probed at LL. This explicitly violates
energy and momentum conservation in the evolution and could be a source of the
reported large NLL corrections. The presented calculation is a step towards
combining energy and momentum conservation with full NLL accuracy in the
evolution.
|
[
{
"created": "Wed, 1 Nov 2006 15:50:07 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Andersen",
"Jeppe R.",
""
]
] |
We calculate the quark-anti-quark contribution to the next-to-leading logarithmic corrections to the BFKL kernel, retaining the dependence on the momenta of the produced particles. This allows us to study the details of the NLL corrections. We demonstrate that the standard calculation of the NLL corrections to the scattering of two off-shell gluons includes contributions from energies far above that which is probed at LL. This explicitly violates energy and momentum conservation in the evolution and could be a source of the reported large NLL corrections. The presented calculation is a step towards combining energy and momentum conservation with full NLL accuracy in the evolution.
|
1102.0064
|
Toshitaka Tatsumi
|
Toshitaka Tatsumi
|
QCD Origin of Strong Magnetic Field in Compact Stars
|
4 pages,5 figures, Proc. of PIF2010
| null | null | null |
hep-ph astro-ph.SR nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Some magnetic properties of quark matter and a microscopic origin of the
strong magnetic field in compact stars are discussed; ferromagnetic order is
discussed with the Fermi liquid theory and possible appearance of spin density
wave is suggested within the NJL model. Implications of these magnetic
properties are briefly discussed for compact stars.
|
[
{
"created": "Tue, 1 Feb 2011 02:42:10 GMT",
"version": "v1"
}
] |
2011-02-02
|
[
[
"Tatsumi",
"Toshitaka",
""
]
] |
Some magnetic properties of quark matter and a microscopic origin of the strong magnetic field in compact stars are discussed; ferromagnetic order is discussed with the Fermi liquid theory and possible appearance of spin density wave is suggested within the NJL model. Implications of these magnetic properties are briefly discussed for compact stars.
|
1401.3310
|
Ikaros Bigi
|
I. Bediaga, I.I. Bigi, J. Miranda, A. Reis
|
CP Asymmetries in Three-Body Final States in Charged $D$ Decays & CPT
Invariance
|
14 pages, 6 Figures
|
Phys. Rev. D 89, 074024 (2014)
|
10.1103/PhysRevD.89.074024
|
UND-HEP-14-BIG01
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The study of local \cp \ asymmetry in Dalitz plots of charm (& beauty) decays
gives us more information about the underlying dynamics than the ratio between
total rates. In this paper we explore the consequences of the constraint from
\cpt \ symmetry with emphasis on three-body $D$ decays. We show simulations of
$D^{\pm} \to \pi^{\pm}K^+K^-$ and discuss correlations with measured $D^{\pm}
\to \pi^{\pm}\pi^+ \pi^-$. There are important comments about analysies of
recent LHCb data in \cp\ asymmetries for $B^{\pm}$ decays to three-body final
states.
|
[
{
"created": "Tue, 14 Jan 2014 19:56:38 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Feb 2014 14:36:17 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Mar 2014 19:36:19 GMT",
"version": "v3"
}
] |
2014-04-23
|
[
[
"Bediaga",
"I.",
""
],
[
"Bigi",
"I. I.",
""
],
[
"Miranda",
"J.",
""
],
[
"Reis",
"A.",
""
]
] |
The study of local \cp \ asymmetry in Dalitz plots of charm (& beauty) decays gives us more information about the underlying dynamics than the ratio between total rates. In this paper we explore the consequences of the constraint from \cpt \ symmetry with emphasis on three-body $D$ decays. We show simulations of $D^{\pm} \to \pi^{\pm}K^+K^-$ and discuss correlations with measured $D^{\pm} \to \pi^{\pm}\pi^+ \pi^-$. There are important comments about analysies of recent LHCb data in \cp\ asymmetries for $B^{\pm}$ decays to three-body final states.
|
1311.3960
|
Damien George
|
B.C. Allanach, Damien P. George and Benjamin Nachman
|
Investigating Multiple Solutions in the Constrained Minimal
Supersymmetric Standard Model
|
30 pages, 12 figures, 2 tables; v2: added discussion on speed of
shooting method, fixed typos, matches published version
|
JHEP 02 (2014) 031
|
10.1007/JHEP02(2014)031
|
DAMTP-2013-68
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recent work has shown that the Constrained Minimal Supersymmetric Standard
Model (CMSSM) can possess several distinct solutions for certain values of its
parameters. The extra solutions were not previously found by public
supersymmetric spectrum generators because fixed point iteration (the algorithm
used by the generators) is unstable in the neighbourhood of these solutions.
The existence of the additional solutions calls into question the robustness of
exclusion limits derived from collider experiments and cosmological
observations upon the CMSSM, because limits were only placed on one of the
solutions. Here, we map the CMSSM by exploring its multi-dimensional parameter
space using the shooting method, which is not subject to the stability issues
which can plague fixed point iteration. We are able to find multiple solutions
where in all previous literature only one was found. The multiple solutions are
of two distinct classes. One class, close to the border of bad electroweak
symmetry breaking, is disfavoured by LEP2 searches for neutralinos and
charginos. The other class has sparticles that are heavy enough to evade the
LEP2 bounds. Chargino masses may differ by up to around 10% between the
different solutions, whereas other sparticle masses differ at the sub-percent
level. The prediction for the dark matter relic density can vary by a hundred
percent or more between the different solutions, so analyses employing the dark
matter constraint are incomplete without their inclusion.
|
[
{
"created": "Fri, 15 Nov 2013 19:41:41 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Feb 2014 14:46:46 GMT",
"version": "v2"
}
] |
2014-02-24
|
[
[
"Allanach",
"B. C.",
""
],
[
"George",
"Damien P.",
""
],
[
"Nachman",
"Benjamin",
""
]
] |
Recent work has shown that the Constrained Minimal Supersymmetric Standard Model (CMSSM) can possess several distinct solutions for certain values of its parameters. The extra solutions were not previously found by public supersymmetric spectrum generators because fixed point iteration (the algorithm used by the generators) is unstable in the neighbourhood of these solutions. The existence of the additional solutions calls into question the robustness of exclusion limits derived from collider experiments and cosmological observations upon the CMSSM, because limits were only placed on one of the solutions. Here, we map the CMSSM by exploring its multi-dimensional parameter space using the shooting method, which is not subject to the stability issues which can plague fixed point iteration. We are able to find multiple solutions where in all previous literature only one was found. The multiple solutions are of two distinct classes. One class, close to the border of bad electroweak symmetry breaking, is disfavoured by LEP2 searches for neutralinos and charginos. The other class has sparticles that are heavy enough to evade the LEP2 bounds. Chargino masses may differ by up to around 10% between the different solutions, whereas other sparticle masses differ at the sub-percent level. The prediction for the dark matter relic density can vary by a hundred percent or more between the different solutions, so analyses employing the dark matter constraint are incomplete without their inclusion.
|
2104.14271
|
Fu-Hu Liu
|
Qi Wang, Fu-Hu Liu, Khusniddin K. Olimov
|
Initial- and final-state temperatures of emission source from
differential cross-section in squared momentum transfer in high energy
collisions
|
Updated version, 18 pages, 6 figures. Fixed some errors in particle
mass in the code. Conclusions unchanged
|
Advances in High Energy Physics 2021, 6677885 (2021) (18 pages)
|
10.1155/2021/6677885
| null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The differential cross-section in squared momentum transfer of $\rho$,
$\rho^0$, $\omega$, $\phi$, $f_{0}(980)$, $f_{1}(1285)$, $f_{0}(1370)$,
$f_{1}(1420)$, $f_{0}(1500)$, and $J/\psi$ produced in high energy virtual
photon-proton ($\gamma$$^{*} p$), photon-proton ($\gamma p$), and proton-proton
($pp$) collisions measured by the H1, ZEUS, and WA102 Collaborations are
analyzed by the Monte Carlo calculations. In the calculations, the Erlang
distribution, Tsallis distribution, and Hagedorn function are separately used
to describe the transverse momentum spectra of the emitted particles. Our
results show that the initial- and final-state temperatures increase from lower
squared photon virtuality to higher one, and decrease with increasing of
center-of-mass energy.
|
[
{
"created": "Thu, 29 Apr 2021 11:42:21 GMT",
"version": "v1"
},
{
"created": "Mon, 31 May 2021 04:10:15 GMT",
"version": "v2"
},
{
"created": "Sat, 25 Sep 2021 11:41:01 GMT",
"version": "v3"
}
] |
2021-09-28
|
[
[
"Wang",
"Qi",
""
],
[
"Liu",
"Fu-Hu",
""
],
[
"Olimov",
"Khusniddin K.",
""
]
] |
The differential cross-section in squared momentum transfer of $\rho$, $\rho^0$, $\omega$, $\phi$, $f_{0}(980)$, $f_{1}(1285)$, $f_{0}(1370)$, $f_{1}(1420)$, $f_{0}(1500)$, and $J/\psi$ produced in high energy virtual photon-proton ($\gamma$$^{*} p$), photon-proton ($\gamma p$), and proton-proton ($pp$) collisions measured by the H1, ZEUS, and WA102 Collaborations are analyzed by the Monte Carlo calculations. In the calculations, the Erlang distribution, Tsallis distribution, and Hagedorn function are separately used to describe the transverse momentum spectra of the emitted particles. Our results show that the initial- and final-state temperatures increase from lower squared photon virtuality to higher one, and decrease with increasing of center-of-mass energy.
|
hep-ph/0010238
|
Jon Rosner
|
Michael Gronau and Jonathan L. Rosner
|
Tests for Coherence in Neutral B Meson Decays
|
15 pages, LaTeX, no figures, to be submitted to Phys. Rev. D
|
Phys.Rev.D63:054006,2001; Erratum-ibid.D64:099902,2001
|
10.1103/PhysRevD.63.054006 10.1103/PhysRevD.64.099902
|
TECHNION-PH-2000-27, EFI 2000-33
|
hep-ph
| null |
A density-matrix method for the study of tagged states of neutral B mesons
with arbitrary coherence properties is applied to several examples, including
$e^+ e^-$ production both at and above the $\Upsilon(4S)$ resonance, and
hadronic production. In the absence of coherence the only term modulating the
exponential decay of a neutral B meson behaves as $\cos \Delta m t$, while a
$\sin \Delta m t$ modulation is a signal of partial or full coherence. Decays
to CP eigenstates are needed to fully specify the density matrix. We relate
these results to more familiar expressions for the cases of the $\Upsilon(4S)$
and incoherent production.
|
[
{
"created": "Fri, 20 Oct 2000 15:25:59 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Gronau",
"Michael",
""
],
[
"Rosner",
"Jonathan L.",
""
]
] |
A density-matrix method for the study of tagged states of neutral B mesons with arbitrary coherence properties is applied to several examples, including $e^+ e^-$ production both at and above the $\Upsilon(4S)$ resonance, and hadronic production. In the absence of coherence the only term modulating the exponential decay of a neutral B meson behaves as $\cos \Delta m t$, while a $\sin \Delta m t$ modulation is a signal of partial or full coherence. Decays to CP eigenstates are needed to fully specify the density matrix. We relate these results to more familiar expressions for the cases of the $\Upsilon(4S)$ and incoherent production.
|
hep-ph/0307019
|
Simon Capstick
|
Simon Capstick, Philip R. Page and Winston Roberts
|
Interpretation of the Theta+ as an isotensor pentaquark with weakly
decaying partners
|
references added, section on pentaquark model revised, 11 pages,
LaTeX, accepted for publication in Physics Letters B
|
Phys.Lett.B570:185-190,2003
|
10.1016/j.physletb.2003.08.010
|
LA-UR-03-4636, JLAB-THY-03-141
|
hep-ph nucl-ex nucl-th
| null |
The Theta+(1540), recently observed at LEPS, DIANA and CLAS, is hypothesized
to be an isotensor resonance. This implies the existence of a multiplet where
the Theta++, Theta+ and Theta0 have isospin-violating strong decays, and the
Theta+++ and Theta- have weak decays and so are long-lived. Production
mechanisms for these states are discussed. The J^P assignment of the Theta is
most likely 1/2^- or 3/2^-.
|
[
{
"created": "Tue, 1 Jul 2003 16:44:43 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Aug 2003 19:51:50 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Capstick",
"Simon",
""
],
[
"Page",
"Philip R.",
""
],
[
"Roberts",
"Winston",
""
]
] |
The Theta+(1540), recently observed at LEPS, DIANA and CLAS, is hypothesized to be an isotensor resonance. This implies the existence of a multiplet where the Theta++, Theta+ and Theta0 have isospin-violating strong decays, and the Theta+++ and Theta- have weak decays and so are long-lived. Production mechanisms for these states are discussed. The J^P assignment of the Theta is most likely 1/2^- or 3/2^-.
|
1705.00514
|
Ye-Ling Zhou
|
Ye-Ling Zhou
|
Flavour symmetric connections with CLFV
|
Talk presented at NuPhys2016 (London, 12-14 December 2016). 8 pages,
2 figures
| null | null |
NuPhys2016-Zhou
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Flavons are crucial for understanding lepton mixing in models with
non-Abelian discrete symmetries. They also result in charged lepton flavour
violation (CLFV) via the couplings with leptons. I emphasise that the
flavon-triggered CLFV succeeds strong connections with lepton flavour mixing.
Relations between branching ratios of CLFV decays and mixing angles are
discussed, and CLFV sum rules are obtained. Flavons with masses around hundreds
of GeV are consistent by current CLFV measurements.
|
[
{
"created": "Mon, 1 May 2017 13:45:32 GMT",
"version": "v1"
}
] |
2017-05-02
|
[
[
"Zhou",
"Ye-Ling",
""
]
] |
Flavons are crucial for understanding lepton mixing in models with non-Abelian discrete symmetries. They also result in charged lepton flavour violation (CLFV) via the couplings with leptons. I emphasise that the flavon-triggered CLFV succeeds strong connections with lepton flavour mixing. Relations between branching ratios of CLFV decays and mixing angles are discussed, and CLFV sum rules are obtained. Flavons with masses around hundreds of GeV are consistent by current CLFV measurements.
|
2309.13148
|
J. Leo Kim
|
Joseph Bramante, Melissa Diamond, J. Leo Kim
|
The Effect of Multiple Cooling Channels on the Formation of Dark Compact
Objects
|
21 pages, 4 figures. Updated to match published version
|
JCAP 02 (2024) 002
|
10.1088/1475-7516/2024/02/002
| null |
hep-ph astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A dissipative dark sector can result in the formation of compact objects with
masses comparable to stars and planets. In this work, we investigate the
formation of such compact objects from a subdominant inelastic dark matter
model, and study the resulting distributions of these objects. In particular,
we consider cooling from dark Bremsstrahlung and a rapid decay process that
occurs after inelastic upscattering. Inelastic transitions introduce an
additional radiative processes which can impact the formation of compact
objects via multiple cooling channels. We find that having multiple cooling
processes changes the mass and abundance of compact objects formed, as compared
to a scenario with only one cooling channel. The resulting distribution of
these astrophysical compact objects and their properties can be used to further
constrain and differentiate between dark sectors.
|
[
{
"created": "Fri, 22 Sep 2023 19:05:44 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Feb 2024 14:48:42 GMT",
"version": "v2"
}
] |
2024-02-16
|
[
[
"Bramante",
"Joseph",
""
],
[
"Diamond",
"Melissa",
""
],
[
"Kim",
"J. Leo",
""
]
] |
A dissipative dark sector can result in the formation of compact objects with masses comparable to stars and planets. In this work, we investigate the formation of such compact objects from a subdominant inelastic dark matter model, and study the resulting distributions of these objects. In particular, we consider cooling from dark Bremsstrahlung and a rapid decay process that occurs after inelastic upscattering. Inelastic transitions introduce an additional radiative processes which can impact the formation of compact objects via multiple cooling channels. We find that having multiple cooling processes changes the mass and abundance of compact objects formed, as compared to a scenario with only one cooling channel. The resulting distribution of these astrophysical compact objects and their properties can be used to further constrain and differentiate between dark sectors.
|
2304.06765
|
Salvador Urrea
|
Pilar Coloma, Jacobo L\'opez-Pav\'on, Laura Molina-Bueno and Salvador
Urrea
|
New Physics searches using ProtoDUNE and the CERN SPS accelerator
|
10 pages, 5 figures, 1 appendix. v2:Minor correction of Figure 2.
Conclusions unchanged
| null | null | null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
The exquisite capabilities of liquid Argon Time Projection Chambers make them
ideal to search for weakly interacting particles in Beyond the Standard Model
scenarios. Given their location at CERN the ProtoDUNE detectors may be exposed
to a flux of such particles, produced in the collisions of 400 GeV protons
(extracted from the Super Proton Synchrotron accelerator) on a target. Here we
point out the interesting possibilities that such a setup offers to search for
both long-lived unstable particles (Heavy Neutral Leptons, axion-like
particles, etc) and stable particles (e.g. light dark matter, or millicharged
particles). Our results show that, under conservative assumptions regarding the
expected luminosity, this setup has the potential to improve over present
bounds for some of the scenarios considered. This could be done within a short
timescale, using facilities that are already in place at CERN, and without
interfering with the experimental program in the North Area.
|
[
{
"created": "Thu, 13 Apr 2023 18:09:52 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jan 2024 16:05:48 GMT",
"version": "v2"
}
] |
2024-01-26
|
[
[
"Coloma",
"Pilar",
""
],
[
"López-Pavón",
"Jacobo",
""
],
[
"Molina-Bueno",
"Laura",
""
],
[
"Urrea",
"Salvador",
""
]
] |
The exquisite capabilities of liquid Argon Time Projection Chambers make them ideal to search for weakly interacting particles in Beyond the Standard Model scenarios. Given their location at CERN the ProtoDUNE detectors may be exposed to a flux of such particles, produced in the collisions of 400 GeV protons (extracted from the Super Proton Synchrotron accelerator) on a target. Here we point out the interesting possibilities that such a setup offers to search for both long-lived unstable particles (Heavy Neutral Leptons, axion-like particles, etc) and stable particles (e.g. light dark matter, or millicharged particles). Our results show that, under conservative assumptions regarding the expected luminosity, this setup has the potential to improve over present bounds for some of the scenarios considered. This could be done within a short timescale, using facilities that are already in place at CERN, and without interfering with the experimental program in the North Area.
|
1702.06836
|
Manibrata Sen
|
Manibrata Sen
|
Supernova neutrinos: fast flavor conversions near the core
|
Presented at the XXII DAE-BRNS HEP Symposium. Proceedings to appear
in European Physics Journal C
| null | null | null |
hep-ph astro-ph.HE astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Neutrino flux streaming from a supernova can undergo rapid flavor conversions
almost immediately above the core. Focusing on this region, we study these fast
conversions using a linear stability analysis. We find that, for realistic
angular distributions of neutrinos, fast conversions can occur within a few
nanoseconds in regions just above the neutrinosphere. Our results also show
that neutrinos travelling towards the core make fast conversions more rapid.
These conversions, if they exist, can have significant implications for
supernova explosion mechanism and nucleosynthesis.
|
[
{
"created": "Wed, 22 Feb 2017 15:16:40 GMT",
"version": "v1"
}
] |
2017-02-23
|
[
[
"Sen",
"Manibrata",
""
]
] |
Neutrino flux streaming from a supernova can undergo rapid flavor conversions almost immediately above the core. Focusing on this region, we study these fast conversions using a linear stability analysis. We find that, for realistic angular distributions of neutrinos, fast conversions can occur within a few nanoseconds in regions just above the neutrinosphere. Our results also show that neutrinos travelling towards the core make fast conversions more rapid. These conversions, if they exist, can have significant implications for supernova explosion mechanism and nucleosynthesis.
|
hep-ph/0505090
|
Fabrizio Nesti
|
M. Giannotti, F. Nesti
|
Nucleon-Nucleon Bremsstrahlung emission of massive Axion
|
16 pages, 5 figures
|
Phys.Rev. D72 (2005) 063005
|
10.1103/PhysRevD.72.063005
| null |
hep-ph astro-ph
| null |
We consider the problem of axion production by bremsstrahlung emission in a
nuclear medium. The usual assumption of a massless axion is replaced by more
general hypotheses, so that we can describe the emission process for axions
with mass up to a few MeV. We point out that in certain physical situations the
contribution from non-zero mass is non-negligible. In particular, in the
mechanism for the production of Gamma Ray Bursts via emission of heavy axions
the axion mass m_a ~ 1MeV is comparable with the temperature of the nuclear
medium and thus can not be disregarded. Looking at our results we find, in
fact, a fairly considerable reduction of the axion luminosity in that
mechanism.
|
[
{
"created": "Wed, 11 May 2005 09:29:17 GMT",
"version": "v1"
}
] |
2013-05-29
|
[
[
"Giannotti",
"M.",
""
],
[
"Nesti",
"F.",
""
]
] |
We consider the problem of axion production by bremsstrahlung emission in a nuclear medium. The usual assumption of a massless axion is replaced by more general hypotheses, so that we can describe the emission process for axions with mass up to a few MeV. We point out that in certain physical situations the contribution from non-zero mass is non-negligible. In particular, in the mechanism for the production of Gamma Ray Bursts via emission of heavy axions the axion mass m_a ~ 1MeV is comparable with the temperature of the nuclear medium and thus can not be disregarded. Looking at our results we find, in fact, a fairly considerable reduction of the axion luminosity in that mechanism.
|
1106.4486
|
Karel Kolar
|
Karel Kolar
|
Investigation of the factorization scheme dependence of finite order
perturbative QCD calculations
|
44 pages, 6 figures, journal version of the text accepted for
publication in JHEP
|
Journal of High Energy Physics 11 (2011) 005
|
10.1007/JHEP11(2011)005
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The freedom associated with the definition of parton distribution functions
is analyzed and formulae governing the dependence of parton distribution
functions and hard scattering cross-sections on unphysical quantities
associated with the renormalization and factorization procedure are derived.
The issue of the specification of factorization schemes via the corresponding
higher order splitting functions is discussed in detail. A numerical analysis
of the practical applicability of the so called ZERO factorization scheme,
which could be useful for the construction of consistent NLO Monte Carlo event
generators, is presented.
|
[
{
"created": "Wed, 22 Jun 2011 15:55:03 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Dec 2011 16:00:16 GMT",
"version": "v2"
}
] |
2011-12-20
|
[
[
"Kolar",
"Karel",
""
]
] |
The freedom associated with the definition of parton distribution functions is analyzed and formulae governing the dependence of parton distribution functions and hard scattering cross-sections on unphysical quantities associated with the renormalization and factorization procedure are derived. The issue of the specification of factorization schemes via the corresponding higher order splitting functions is discussed in detail. A numerical analysis of the practical applicability of the so called ZERO factorization scheme, which could be useful for the construction of consistent NLO Monte Carlo event generators, is presented.
|
1302.0314
|
Sam McDermott
|
Clifford Cheung, Samuel D. McDermott, Kathryn M. Zurek
|
Inspecting the Higgs for New Weakly Interacting Particles
|
30 pages, 12 figures
| null |
10.1007/JHEP04(2013)074
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We explore new physics scenarios which are optimally probed through precision
Higgs measurements rather than direct collider searches. Such theories consist
of additional electroweak charged or singlet states which couple directly to or
mix with the Higgs boson; particles of this kind may be weakly constrained by
direct limits due to their meager production rates and soft decay products. We
present a simplified framework which characterizes the effects of these states
on Higgs physics by way of tree level mixing (with neutral scalars) and loop
level modifications (from electrically charged states), all expressed in terms
of three mixing angles and three loop parameters, respectively. The theory
parameters are constrained and in some cases even fixed by ratios of Higgs
production and decay rates. Our setup is simpler than a general effective
operator analysis, in that we discard parameters irrelevant to Higgs
observables while retaining complex correlations among measurements that arise
due to the underlying mixing and radiative effects. We show that certain
correlated observations are forbidden, e.g. a depleted ratio of Higgs
production from gluon fusion versus vector boson fusion together with a
depleted ratio of Higgs decays to bb versus WW. Moreover, we study the strong
correlation between the Higgs decay rate to gamma gamma and WW and how it can
be violated in the presence of additional electrically charged particles. Our
formalism maps straightforwardly onto a variety of new physics models, such as
the NMSSM. We show, for example, that with a Higgsino of mass > 100 GeV and a
singlet-Higgs coupling of lambda=0.7, the photon signal strength can deviate
from the vector signal strength by up to ~ 40-60% while depleting the vector
signal strength by only 5-15% relative to the Standard Model.
|
[
{
"created": "Fri, 1 Feb 2013 23:26:38 GMT",
"version": "v1"
}
] |
2015-06-12
|
[
[
"Cheung",
"Clifford",
""
],
[
"McDermott",
"Samuel D.",
""
],
[
"Zurek",
"Kathryn M.",
""
]
] |
We explore new physics scenarios which are optimally probed through precision Higgs measurements rather than direct collider searches. Such theories consist of additional electroweak charged or singlet states which couple directly to or mix with the Higgs boson; particles of this kind may be weakly constrained by direct limits due to their meager production rates and soft decay products. We present a simplified framework which characterizes the effects of these states on Higgs physics by way of tree level mixing (with neutral scalars) and loop level modifications (from electrically charged states), all expressed in terms of three mixing angles and three loop parameters, respectively. The theory parameters are constrained and in some cases even fixed by ratios of Higgs production and decay rates. Our setup is simpler than a general effective operator analysis, in that we discard parameters irrelevant to Higgs observables while retaining complex correlations among measurements that arise due to the underlying mixing and radiative effects. We show that certain correlated observations are forbidden, e.g. a depleted ratio of Higgs production from gluon fusion versus vector boson fusion together with a depleted ratio of Higgs decays to bb versus WW. Moreover, we study the strong correlation between the Higgs decay rate to gamma gamma and WW and how it can be violated in the presence of additional electrically charged particles. Our formalism maps straightforwardly onto a variety of new physics models, such as the NMSSM. We show, for example, that with a Higgsino of mass > 100 GeV and a singlet-Higgs coupling of lambda=0.7, the photon signal strength can deviate from the vector signal strength by up to ~ 40-60% while depleting the vector signal strength by only 5-15% relative to the Standard Model.
|
0811.3995
|
B{\o}rge Kile Gjelsten
|
B. K. Gjelsten
|
R-parity conserving SUSY searches in ATLAS
|
7 pages, 4 figures, to appear in the proceedings of Identification of
dark matter 2008, August 18-22, Stockholm, Sweden
|
PoS idm2008:060,2008
| null |
ATL-PHYS-PROC-2008-061
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Searches for physics beyond the Standard Model of particle physics are about
to enter a new era with the startup of the Large Hadron Collider (LHC) at CERN.
Prospects for R-parity conserving supersymmetry discovery and measurements with
the ATLAS detector at the LHC are presented. Methods for determining the
parameters of the underlying supersymmetry model and the relation to dark
matter estimation are discussed.
|
[
{
"created": "Mon, 24 Nov 2008 23:42:00 GMT",
"version": "v1"
}
] |
2010-02-17
|
[
[
"Gjelsten",
"B. K.",
""
]
] |
Searches for physics beyond the Standard Model of particle physics are about to enter a new era with the startup of the Large Hadron Collider (LHC) at CERN. Prospects for R-parity conserving supersymmetry discovery and measurements with the ATLAS detector at the LHC are presented. Methods for determining the parameters of the underlying supersymmetry model and the relation to dark matter estimation are discussed.
|
1805.06401
|
Andrea Mauri
|
Andrea Mauri, Nicola Serra, Rafael Silva Coutinho
|
Towards establishing Lepton Flavour Universality violation in
$\bar{B}\to \bar{K}^*\ell^+\ell^-$ decays
|
6 pages, 7 figures. Matching the journal version
|
Phys. Rev. D 99, 013007 (2019)
|
10.1103/PhysRevD.99.013007
|
ZU-TH-15/18
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
Rare semileptonic $b \to s \ell^+ \ell^-$ transitions provide some of the
most promising frameworks to search for new physics effects. Recent analyses of
these decays have indicated an anomalous behaviour in measurements of angular
distributions of the decay $B^0\to K^*\mu^+\mu^-$ and
lepton-flavour-universality observables. Unambiguously establishing if these
deviations have a common nature is of paramount importance in order to
understand the observed pattern. We propose a novel approach to independently
and complementary probe this hypothesis by performing a simultaneous amplitude
analysis of $\bar{B}^0 \to \bar{K}^{*0} \mu^+\mu^-$ and $\bar{B}^0 \to
\bar{K}^{*0} e^+e^-$ decays. This method enables the direct determination of
observables that encode potential non-equal couplings of muons and electrons,
and are found to be insensitive to nonperturbative QCD effects. If current
hints of new physics are confirmed, our approach could allow an early discovery
of physics beyond the standard model with LHCb run II data sets.
|
[
{
"created": "Wed, 16 May 2018 16:14:03 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Mar 2019 13:50:44 GMT",
"version": "v2"
}
] |
2019-03-21
|
[
[
"Mauri",
"Andrea",
""
],
[
"Serra",
"Nicola",
""
],
[
"Coutinho",
"Rafael Silva",
""
]
] |
Rare semileptonic $b \to s \ell^+ \ell^-$ transitions provide some of the most promising frameworks to search for new physics effects. Recent analyses of these decays have indicated an anomalous behaviour in measurements of angular distributions of the decay $B^0\to K^*\mu^+\mu^-$ and lepton-flavour-universality observables. Unambiguously establishing if these deviations have a common nature is of paramount importance in order to understand the observed pattern. We propose a novel approach to independently and complementary probe this hypothesis by performing a simultaneous amplitude analysis of $\bar{B}^0 \to \bar{K}^{*0} \mu^+\mu^-$ and $\bar{B}^0 \to \bar{K}^{*0} e^+e^-$ decays. This method enables the direct determination of observables that encode potential non-equal couplings of muons and electrons, and are found to be insensitive to nonperturbative QCD effects. If current hints of new physics are confirmed, our approach could allow an early discovery of physics beyond the standard model with LHCb run II data sets.
|
2203.00604
|
Valery Lyubovitskij
|
Valery E. Lyubovitskij, Ivan Schmidt
|
Meson masses and decay constants in holographic QCD consistent with ChPT
and HQET
|
7 pages
|
Phys. Rev. D 105, 074009 (2022)
|
10.1103/PhysRevD.105.074009
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We focus on the chiral and heavy quark mass expansion of mesons masses and
decay constants. We propose a light-front QCD formalism for the evaluation of
these quantities, consistent with chiral perturbation theory and heavy quark
effective theory.
|
[
{
"created": "Tue, 1 Mar 2022 16:46:36 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Apr 2022 07:51:24 GMT",
"version": "v2"
}
] |
2022-04-19
|
[
[
"Lyubovitskij",
"Valery E.",
""
],
[
"Schmidt",
"Ivan",
""
]
] |
We focus on the chiral and heavy quark mass expansion of mesons masses and decay constants. We propose a light-front QCD formalism for the evaluation of these quantities, consistent with chiral perturbation theory and heavy quark effective theory.
|
2309.08260
|
German F. R. Sborlini
|
German F. R. Sborlini, Roger Hern\'andez-Pinto, Salvador Ochoa-Oregon,
David F. Renter\'ia-Estrada
|
Using photon-hadron production to impose restrictions on heavy-hadrons
fragmentation functions
|
6 pages, 2 figures. Contribution to the Proceedings of the EPS-HEP
2023 Conference
|
PoS(EPS-HEP2023)234
| null |
IFIC/23-42
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
Fragmentation Functions (FF) are universal non-perturbative objects that
model hadronization in some general kind of processes. They are mainly
extracted from experimental data, hence constraining the parameters of the
corresponding fits is crucial for achieving reliable results. As expected, the
production of lighter hadrons is favoured w.r.t. heavy ones, thus we would like
to exploit the precise knowledge of pion FFs to constraint the shape of kaon
(or heavier) FFs. In this talk, we show how imposing specific cuts on
photon-hadron production leads to relations between the $u$-started FFs. For
doing so, we exploit the reconstruction of momentum fractions in terms of
experimentally-accessible quantities and introduce NLO QCD + LO QED corrections
to reduce the theoretical uncertainties.
|
[
{
"created": "Fri, 15 Sep 2023 09:14:13 GMT",
"version": "v1"
}
] |
2023-09-18
|
[
[
"Sborlini",
"German F. R.",
""
],
[
"Hernández-Pinto",
"Roger",
""
],
[
"Ochoa-Oregon",
"Salvador",
""
],
[
"Rentería-Estrada",
"David F.",
""
]
] |
Fragmentation Functions (FF) are universal non-perturbative objects that model hadronization in some general kind of processes. They are mainly extracted from experimental data, hence constraining the parameters of the corresponding fits is crucial for achieving reliable results. As expected, the production of lighter hadrons is favoured w.r.t. heavy ones, thus we would like to exploit the precise knowledge of pion FFs to constraint the shape of kaon (or heavier) FFs. In this talk, we show how imposing specific cuts on photon-hadron production leads to relations between the $u$-started FFs. For doing so, we exploit the reconstruction of momentum fractions in terms of experimentally-accessible quantities and introduce NLO QCD + LO QED corrections to reduce the theoretical uncertainties.
|
2105.15072
|
Reuven Balkin
|
Reuven Balkin, Mieczyslaw W. Krasny, Teng Ma, Benjamin R. Safdi and
Yotam Soreq
|
Probing ALPs at the CERN Gamma Factory
|
12 pages, 4 figures
| null |
10.1002/andp.202100222
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The aim of the proposed CERN Gamma Factory is to produce $\sim 10^{17}$
photons per second with energies up to 400 MeV. The photon beam intensity is
expected to be a factor of $\mathcal{O}(10^7)$ larger than that of the
presently available photon beams in the MeV energy range. In this work, we
explore its potential to probe physics beyond the Standard Model. In
particular, we discuss searches for axion like particles (ALPs) with dominant
couplings to photons and consider various production scenarios - fixed target,
photon-photon collision, and conversion by a magnetic field and detection
schemes - via decay to photons or back-conversion. We find that the Gamma
Factory in a fixed target mode can probe ALPs with mass $m_a \lesssim
\mathcal{O}(100\,\mathrm{MeV})$ and decay constants larger than $10^7$ GeV,
improving by an order of magnitude the discovery potential of previous beam
dump experiments.
|
[
{
"created": "Mon, 31 May 2021 16:01:22 GMT",
"version": "v1"
}
] |
2021-09-28
|
[
[
"Balkin",
"Reuven",
""
],
[
"Krasny",
"Mieczyslaw W.",
""
],
[
"Ma",
"Teng",
""
],
[
"Safdi",
"Benjamin R.",
""
],
[
"Soreq",
"Yotam",
""
]
] |
The aim of the proposed CERN Gamma Factory is to produce $\sim 10^{17}$ photons per second with energies up to 400 MeV. The photon beam intensity is expected to be a factor of $\mathcal{O}(10^7)$ larger than that of the presently available photon beams in the MeV energy range. In this work, we explore its potential to probe physics beyond the Standard Model. In particular, we discuss searches for axion like particles (ALPs) with dominant couplings to photons and consider various production scenarios - fixed target, photon-photon collision, and conversion by a magnetic field and detection schemes - via decay to photons or back-conversion. We find that the Gamma Factory in a fixed target mode can probe ALPs with mass $m_a \lesssim \mathcal{O}(100\,\mathrm{MeV})$ and decay constants larger than $10^7$ GeV, improving by an order of magnitude the discovery potential of previous beam dump experiments.
|
hep-ph/0508047
|
Michael Gronau
|
Michael Gronau
|
A precise sum rule among four B -> Kpi CP asymmetries
|
10 pages, a few reference added, to be published in Physics Letters B
|
Phys.Lett. B627 (2005) 82-88
|
10.1016/j.physletb.2005.09.014
|
SLAC-PUB-11380
|
hep-ph
| null |
A sum rule relation is proposed for direct CP asymmetries in $B\to K\pi$
decays. Leading terms are identical in the isospin symmetry limit, while
subleading terms are equal in the flavor SU(3) and heavy quark limits. The sum
rule predicts $A_{\rm CP}(B^0\to K^0\pi^0)=-0.17 \pm 0.06$ using current
asymmetry measurements for the other three $B\to K\pi$ decays. A violation of
the sum rule would be evidence for New Physics in $b\to s\bar qq$ transitions.
|
[
{
"created": "Wed, 3 Aug 2005 18:14:43 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Aug 2005 19:13:34 GMT",
"version": "v2"
},
{
"created": "Sun, 11 Sep 2005 14:58:48 GMT",
"version": "v3"
}
] |
2010-04-05
|
[
[
"Gronau",
"Michael",
""
]
] |
A sum rule relation is proposed for direct CP asymmetries in $B\to K\pi$ decays. Leading terms are identical in the isospin symmetry limit, while subleading terms are equal in the flavor SU(3) and heavy quark limits. The sum rule predicts $A_{\rm CP}(B^0\to K^0\pi^0)=-0.17 \pm 0.06$ using current asymmetry measurements for the other three $B\to K\pi$ decays. A violation of the sum rule would be evidence for New Physics in $b\to s\bar qq$ transitions.
|
hep-ph/9407223
|
Jan Kalinowski
|
K.J. Abraham, J. Kalinowski and P. Sciepko
|
New probes of anomalous $WW\gamma$ couplings at future $e^+e^-$ linacs
|
7 pages in LaTeX style, figures not included, can be obtained from
the authors, IFT-94/14, presented at Kazimierz Conference, May 23-27, 1994
|
Phys.Lett. B339 (1994) 136-140
|
10.1016/0370-2693(94)91145-2
| null |
hep-ph
| null |
We investigate the sensitivity of single photon plus missing energy
cross-sections at future $e^{+}e^{-}$ linacs to non-standard $WW\gamma$
couplings. We show that even with conservative estimates of systematic errors
there is still considerable sensitivity to anomalous couplings. Analytic
expressions for helicity amplitudes are presented.
|
[
{
"created": "Tue, 5 Jul 1994 09:31:02 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Abraham",
"K. J.",
""
],
[
"Kalinowski",
"J.",
""
],
[
"Sciepko",
"P.",
""
]
] |
We investigate the sensitivity of single photon plus missing energy cross-sections at future $e^{+}e^{-}$ linacs to non-standard $WW\gamma$ couplings. We show that even with conservative estimates of systematic errors there is still considerable sensitivity to anomalous couplings. Analytic expressions for helicity amplitudes are presented.
|
0806.2087
|
Kirill Tuchin
|
Yang Li, Kirill Tuchin
|
Probing the low-x structure of nuclear matter with diffractive hadron
production in pA collisions
|
18 pages, 7 figures
|
Phys.Rev.C78:024905,2008
|
10.1103/PhysRevC.78.024905
|
RBRC-740
|
hep-ph nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We argue that hadron production in coherent diffraction of proton on a heavy
nucleus provides a very sensitive probe of the low-x QCD dynamics. This process
probes the BFKL dynamics in proton and the non-linear gluon evolution in
nucleus. We calculate the diffractive hadron production cross sections in the
RHIC and LHC kinematic regions. To study the nuclear effects we introduce the
diffractive nuclear modification factor. We show that unlike the nuclear
modification factor for inclusive hadron production that has a very interesting
dynamics at RHIC but is expected to be almost completely saturated at the LHC,
the nuclear modification factor for diffractive production exhibits a
non-trivial behavior both at RHIC and LHC.
|
[
{
"created": "Thu, 12 Jun 2008 15:12:06 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Li",
"Yang",
""
],
[
"Tuchin",
"Kirill",
""
]
] |
We argue that hadron production in coherent diffraction of proton on a heavy nucleus provides a very sensitive probe of the low-x QCD dynamics. This process probes the BFKL dynamics in proton and the non-linear gluon evolution in nucleus. We calculate the diffractive hadron production cross sections in the RHIC and LHC kinematic regions. To study the nuclear effects we introduce the diffractive nuclear modification factor. We show that unlike the nuclear modification factor for inclusive hadron production that has a very interesting dynamics at RHIC but is expected to be almost completely saturated at the LHC, the nuclear modification factor for diffractive production exhibits a non-trivial behavior both at RHIC and LHC.
|
hep-ph/0202216
|
Boris Kopeliovich
|
Yu.P. Ivanov, B.Z. Kopeliovich, A.V. Tarasov, J. Huefner
|
Electroproduction of Charmonia off Nuclei
|
21 pages of Latex including 14 figures; few misprints are fixed
|
Phys.Rev. C66 (2002) 024903
|
10.1103/PhysRevC.66.024903
| null |
hep-ph nucl-th
| null |
In a recent publication we have calculated elastic charmonium production in
ep collisions employing realistic charmonia wave functions and dipole cross
sections and have found good agreement with the data in a wide range of s and
Q^2. Using the ingredients from those calculations we calculate exclusive
electroproduction of charmonia off nuclei. Here new effects become important,
(i) color filtering of the c-cbar pair on its trajectory through nuclear
matter, (ii) dependence on the finite lifetime of the c-cbar fluctuation
(coherence length) and (iii) gluon shadowing in a nucleus compared to the one
in a nucleon. Total coherent and incoherent cross sections for C, Cu and Pb as
functions of s and Q^2 are presented together with some differential cross
sections. The results can be tested with future electron-nucleus colliders or
in peripheral collisions of ultrarelativistic heavy ions.
|
[
{
"created": "Fri, 22 Feb 2002 19:20:09 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Feb 2002 16:07:45 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Ivanov",
"Yu. P.",
""
],
[
"Kopeliovich",
"B. Z.",
""
],
[
"Tarasov",
"A. V.",
""
],
[
"Huefner",
"J.",
""
]
] |
In a recent publication we have calculated elastic charmonium production in ep collisions employing realistic charmonia wave functions and dipole cross sections and have found good agreement with the data in a wide range of s and Q^2. Using the ingredients from those calculations we calculate exclusive electroproduction of charmonia off nuclei. Here new effects become important, (i) color filtering of the c-cbar pair on its trajectory through nuclear matter, (ii) dependence on the finite lifetime of the c-cbar fluctuation (coherence length) and (iii) gluon shadowing in a nucleus compared to the one in a nucleon. Total coherent and incoherent cross sections for C, Cu and Pb as functions of s and Q^2 are presented together with some differential cross sections. The results can be tested with future electron-nucleus colliders or in peripheral collisions of ultrarelativistic heavy ions.
|
1507.06478
|
Christopher Harvey
|
C. N. Harvey, A. Gonoskov, M. Marklund, E. Wallin
|
Narrowing of the emission angle in high-intensity Compton scattering
|
7 pages, 6 figures
|
Phys. Rev. A 93, 022112 (2016)
|
10.1103/PhysRevA.93.022112
| null |
hep-ph physics.plasm-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the emission spectrum of high-energy electrons in an intense
laser field. At high intensities ($a_0\sim200$) we find that the QED theory
predicts a narrower angular spread of emissions than the classical theory. This
is due to the classical theory overestimating the energy loss of the particles,
resulting in them becoming more susceptible to reflection in the laser pulse.
|
[
{
"created": "Thu, 23 Jul 2015 12:57:38 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Dec 2015 15:41:05 GMT",
"version": "v2"
}
] |
2016-02-24
|
[
[
"Harvey",
"C. N.",
""
],
[
"Gonoskov",
"A.",
""
],
[
"Marklund",
"M.",
""
],
[
"Wallin",
"E.",
""
]
] |
We consider the emission spectrum of high-energy electrons in an intense laser field. At high intensities ($a_0\sim200$) we find that the QED theory predicts a narrower angular spread of emissions than the classical theory. This is due to the classical theory overestimating the energy loss of the particles, resulting in them becoming more susceptible to reflection in the laser pulse.
|
2012.15609
|
Kirtiman Ghosh
|
Saiyad Ashanujjaman, Kirtiman Ghosh
|
The Genuine Type-V Seesaw Model: Phenomenological Introduction
|
56 pages
| null |
10.1007/JHEP06(2021)084
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We study a model which generates Majorana neutrino masses at tree-level via
low-energy effective operator with mass-dimension-9. Introduction of such a
higher dimensional operator brings down the lepton number violating mass scale
to TeV making such model potentially testable at present or near future
colliders. This model possesses several new $SU(2)_L$ fermionic multiplets, in
particular, three generations of triplets, quadruplets and quintuplets, and
thus a rich phenomenology at the LHC. As the lepton flavour violation arises
very naturally in such setup, we put constraints on the Yukawa couplings and
heavy fermion masses from the current experimental bounds on lepton flavour
violating processes. We also obtain 95% CL lower bounds on the masses of the
triplets, quadruplets and quintuplets using a recent CMS search for multilepton
final states with 137 inverse femtobarn integrated luminosity data at 13 TeV
center of mass energy. The possibility that the heavy fermions could be
long-lived leaving disappearing charge track signatures or displaced vertex at
the future colliders like LHeC, FCC-he, MATHUSLA, etc. is also discussed.
|
[
{
"created": "Thu, 31 Dec 2020 14:00:48 GMT",
"version": "v1"
}
] |
2021-06-30
|
[
[
"Ashanujjaman",
"Saiyad",
""
],
[
"Ghosh",
"Kirtiman",
""
]
] |
We study a model which generates Majorana neutrino masses at tree-level via low-energy effective operator with mass-dimension-9. Introduction of such a higher dimensional operator brings down the lepton number violating mass scale to TeV making such model potentially testable at present or near future colliders. This model possesses several new $SU(2)_L$ fermionic multiplets, in particular, three generations of triplets, quadruplets and quintuplets, and thus a rich phenomenology at the LHC. As the lepton flavour violation arises very naturally in such setup, we put constraints on the Yukawa couplings and heavy fermion masses from the current experimental bounds on lepton flavour violating processes. We also obtain 95% CL lower bounds on the masses of the triplets, quadruplets and quintuplets using a recent CMS search for multilepton final states with 137 inverse femtobarn integrated luminosity data at 13 TeV center of mass energy. The possibility that the heavy fermions could be long-lived leaving disappearing charge track signatures or displaced vertex at the future colliders like LHeC, FCC-he, MATHUSLA, etc. is also discussed.
|
2107.14643
|
Majid Modarres
|
R. Aminzadeh Nik, M. Modarres, N. Olanj, R. Taghavi
|
The P-P(\={P}) cross-section of isolated single-photon production in the
$k_t$-factorization and different angular ordering unintegrated parton
distributions frameworks
| null |
Phys.Rev.D 103 (2021) 074020
|
10.1103/PhysRevD.103.074020
| null |
hep-ph hep-ex hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the present work, it is intended to calculate and study the single and
double differential cross-sections of the prompt single-photon production as a
function of produced single-photon transverse momentum and rapidity, in the
high-energy P-P(\={P}) colliders, such as LHC and TEVATRON. The differential
cross-sections of prompt single-photon production are calculated in the
$k_t$-factorization frameworks using various angular ordering unintegrated
parton distribution functions (UPDF), namely the Kimber et al. and Martin et
al. procedures. These scheme-dependent UPDF are generated in the leading and
next-to-leading order levels to predict and analyze the different partonic
contributions to the above cross-sections. The above two procedures utilize the
phenomenological parton distribution functions (PDF) libraries of Martin et
al., i.e., MMHT2014. It is shown that the calculated prompt single-photon
production differential cross-sections in the above frameworks are relatively
successful in generating satisfactory results compared to the experimental data
of different collaborations, i.e., CDF (2017), ATLAS (2017), CMS (2011) and D0
(2006), as well as the other theoretical predictions such as collinear
factorization Monte Carlo calculations (the JETPHOX, SHERPA, PYTHIA, and MCFM
methods). Also, for a closer precision, the differential cross-section for the
NLO gluon-gluon , quark-gluon and quark-(anti)quark processes are calculated.
An extensive discussion and comparison are made regarding (i) the behavior of
the contributing partonic sub-processes, (ii) the possible double-counting
between the $2\to 2$ and $2\to 3$ sub-processes, i.e., gluons-fusion, in our
calculated prompt single-photon production differential cross-sections and
(iii) the sensibility check of our results to the different angular ordering
constraints.
|
[
{
"created": "Fri, 30 Jul 2021 14:07:49 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Sep 2021 19:53:05 GMT",
"version": "v2"
}
] |
2021-09-13
|
[
[
"Nik",
"R. Aminzadeh",
""
],
[
"Modarres",
"M.",
""
],
[
"Olanj",
"N.",
""
],
[
"Taghavi",
"R.",
""
]
] |
In the present work, it is intended to calculate and study the single and double differential cross-sections of the prompt single-photon production as a function of produced single-photon transverse momentum and rapidity, in the high-energy P-P(\={P}) colliders, such as LHC and TEVATRON. The differential cross-sections of prompt single-photon production are calculated in the $k_t$-factorization frameworks using various angular ordering unintegrated parton distribution functions (UPDF), namely the Kimber et al. and Martin et al. procedures. These scheme-dependent UPDF are generated in the leading and next-to-leading order levels to predict and analyze the different partonic contributions to the above cross-sections. The above two procedures utilize the phenomenological parton distribution functions (PDF) libraries of Martin et al., i.e., MMHT2014. It is shown that the calculated prompt single-photon production differential cross-sections in the above frameworks are relatively successful in generating satisfactory results compared to the experimental data of different collaborations, i.e., CDF (2017), ATLAS (2017), CMS (2011) and D0 (2006), as well as the other theoretical predictions such as collinear factorization Monte Carlo calculations (the JETPHOX, SHERPA, PYTHIA, and MCFM methods). Also, for a closer precision, the differential cross-section for the NLO gluon-gluon , quark-gluon and quark-(anti)quark processes are calculated. An extensive discussion and comparison are made regarding (i) the behavior of the contributing partonic sub-processes, (ii) the possible double-counting between the $2\to 2$ and $2\to 3$ sub-processes, i.e., gluons-fusion, in our calculated prompt single-photon production differential cross-sections and (iii) the sensibility check of our results to the different angular ordering constraints.
|
hep-ph/0103334
|
Bruno Machet
|
B. Machet, S.T. Petcov
|
Hierarchies of quark masses and the mixing matrix in the standard theory
|
Shortened version to be published in Phys. Lett. B
|
Phys.Lett.B513:371-380,2001
|
10.1016/S0370-2693(01)00765-1
|
PAR-LPTHE 01/15, Ref. SISSA 28/2001/EP
|
hep-ph
| null |
We study the general dependence of mixing angles on heavy fermion masses when
mass hierarchies exist among the fermions. For two generations and small
Cabibbo angle, this angle is directly shown to scale like $\mu_1/m_s \pm
\mu_2/m_c$, where $|\mu_1| \ll m_s, |\mu_2| \ll m_c$ are independent mass
scales. For $n=3$ generations, we extend to the Yukawa matrices of $u$- and
$d$-type quarks the property that the $2\times 2$ upper-left sub-matrix of the
Cabibbo-Kobayashi-Maskawa matrix $K$ is a good approximation to the Cabibbo
matrix $C$. Then, without any additional Ansatz concerning the existence of
mass hierarchies or the smallness of the mixing angles, the moduli of its
entries $K_{13},K_{23},K_{31},K_{32}$ are shown to scale like
$[\beta_{13},\beta_{23},\beta_{31},\beta_{32}] \sqrt{{m_c}/{m_t}} \pm
[\delta_{13},\delta_{23},\delta_{31},\delta_{32}] \sqrt{{m_s}/{m_b}}$, where
the $\beta$'s and the $\delta$'s are coefficients smaller than 10. This method,
when used for two generations, gives a dependence on $m_s$ and $m_c$ ``weaker''
than the one obtained first, but which matches a well known behaviour for the
Cabibbo angle: $\theta_c \approx \sqrt{\epsilon_d (m_d/m_s)} -
\sqrt{\epsilon_u(m_u/m_c)}$, with $\epsilon_d,\epsilon_u \leq 1$. The
asymptotic behaviour in the case of three generations can also be strengthened
into a $1/m_{b,t}$ behaviour by incorporating our knowledge about the
hierarchies of quark masses and the smallness of the mixing angles.
|
[
{
"created": "Fri, 30 Mar 2001 12:25:59 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jun 2001 11:52:29 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Machet",
"B.",
""
],
[
"Petcov",
"S. T.",
""
]
] |
We study the general dependence of mixing angles on heavy fermion masses when mass hierarchies exist among the fermions. For two generations and small Cabibbo angle, this angle is directly shown to scale like $\mu_1/m_s \pm \mu_2/m_c$, where $|\mu_1| \ll m_s, |\mu_2| \ll m_c$ are independent mass scales. For $n=3$ generations, we extend to the Yukawa matrices of $u$- and $d$-type quarks the property that the $2\times 2$ upper-left sub-matrix of the Cabibbo-Kobayashi-Maskawa matrix $K$ is a good approximation to the Cabibbo matrix $C$. Then, without any additional Ansatz concerning the existence of mass hierarchies or the smallness of the mixing angles, the moduli of its entries $K_{13},K_{23},K_{31},K_{32}$ are shown to scale like $[\beta_{13},\beta_{23},\beta_{31},\beta_{32}] \sqrt{{m_c}/{m_t}} \pm [\delta_{13},\delta_{23},\delta_{31},\delta_{32}] \sqrt{{m_s}/{m_b}}$, where the $\beta$'s and the $\delta$'s are coefficients smaller than 10. This method, when used for two generations, gives a dependence on $m_s$ and $m_c$ ``weaker'' than the one obtained first, but which matches a well known behaviour for the Cabibbo angle: $\theta_c \approx \sqrt{\epsilon_d (m_d/m_s)} - \sqrt{\epsilon_u(m_u/m_c)}$, with $\epsilon_d,\epsilon_u \leq 1$. The asymptotic behaviour in the case of three generations can also be strengthened into a $1/m_{b,t}$ behaviour by incorporating our knowledge about the hierarchies of quark masses and the smallness of the mixing angles.
|
hep-ph/0302110
|
Jonathan L. Rosner
|
Zumin Luo and Jonathan L. Rosner
|
Final-State Phases in $B \to$ Baryon-Antibaryon Decays
|
14 pages, LaTeX, 2 figures, submitted to Phys. Rev. D, references and
discussion of helicity amplitudes added
|
Phys.Rev. D67 (2003) 094017
|
10.1103/PhysRevD.67.094017
|
EFI 03-03-Rev
|
hep-ph
| null |
The recent observation of the decay $\ob \to \Lambda_c^+ \bar p$ suggests
that related decays may soon be visible at $e^+ e^-$ colliders. It is shown how
these decays can shed light on strong final-state phases and amplitudes
involving the spectator quark, both of which are normally expected to be small
in B decays.
|
[
{
"created": "Thu, 13 Feb 2003 23:42:19 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Apr 2003 16:52:30 GMT",
"version": "v2"
},
{
"created": "Wed, 16 Apr 2003 03:41:21 GMT",
"version": "v3"
}
] |
2009-11-10
|
[
[
"Luo",
"Zumin",
""
],
[
"Rosner",
"Jonathan L.",
""
]
] |
The recent observation of the decay $\ob \to \Lambda_c^+ \bar p$ suggests that related decays may soon be visible at $e^+ e^-$ colliders. It is shown how these decays can shed light on strong final-state phases and amplitudes involving the spectator quark, both of which are normally expected to be small in B decays.
|
hep-ph/0511207
|
Alessio Notari
|
Tirthabir Biswas, Alessio Notari
|
Can Inflation solve the Hierarchy Problem?
|
7 pages. Replaced version with comparison with WMAP 3-year data
|
Phys.Rev. D74 (2006) 043508
|
10.1103/PhysRevD.74.043508
| null |
hep-ph astro-ph gr-qc hep-th
| null |
Inflation with tunneling from a false to a true vacuum becomes viable in the
presence of a scalar field that slows down the initial de Sitter phase. As a
by-product this field also sets dynamically the value of the Newton constant
observed today. This can be very large if the tunneling rate (which is
exponentially sensitive to the barrier) is small enough. Therefore along with
Inflation we also provide a natural dynamical explanation for why gravity is so
weak today. Moreover we predict a spectrum of gravity waves peaked at around
0.1 mHz, that will be detectable by the planned space inteferometer LISA.
Finally we discuss interesting predictions on cosmological scalar and tensor
fluctuations in the light the WMAP 3-year data.
|
[
{
"created": "Wed, 16 Nov 2005 23:08:21 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Nov 2005 00:52:12 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Apr 2006 22:07:45 GMT",
"version": "v3"
}
] |
2009-11-11
|
[
[
"Biswas",
"Tirthabir",
""
],
[
"Notari",
"Alessio",
""
]
] |
Inflation with tunneling from a false to a true vacuum becomes viable in the presence of a scalar field that slows down the initial de Sitter phase. As a by-product this field also sets dynamically the value of the Newton constant observed today. This can be very large if the tunneling rate (which is exponentially sensitive to the barrier) is small enough. Therefore along with Inflation we also provide a natural dynamical explanation for why gravity is so weak today. Moreover we predict a spectrum of gravity waves peaked at around 0.1 mHz, that will be detectable by the planned space inteferometer LISA. Finally we discuss interesting predictions on cosmological scalar and tensor fluctuations in the light the WMAP 3-year data.
|
hep-ph/0609308
|
Cyrille Marquet
|
Cyrille Marquet
|
Inclusive and diffractive deep inelastic scattering in high-energy QCD
|
7 pages, 5 figures, Proceedings of the XLVIth Cracow School of
Theoretical Physics, Zakopane, Poland, May 27-June 5 2006
|
Acta Phys.Polon. B37 (2006) 3553-3560
| null | null |
hep-ph
| null |
In the context of both inclusive and diffractive deep inelastic scattering,
we derive the first phenomenological consequences of the inclusion of Pomeron
loops in the QCD evolution equations towards high energy. We discuss the
transition between the well-known geometric scaling regime and the new
diffusive scaling, that emerges for sufficiently high energies and up to very
large values of Q^2, well above the proton saturation momentum.
|
[
{
"created": "Fri, 29 Sep 2006 14:06:29 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Marquet",
"Cyrille",
""
]
] |
In the context of both inclusive and diffractive deep inelastic scattering, we derive the first phenomenological consequences of the inclusion of Pomeron loops in the QCD evolution equations towards high energy. We discuss the transition between the well-known geometric scaling regime and the new diffusive scaling, that emerges for sufficiently high energies and up to very large values of Q^2, well above the proton saturation momentum.
|
1909.09234
|
Venus Keus
|
Venus Keus
|
Dark CP-violation through the $Z$-portal
|
19 pages, 8 figures, the version published in PRD
|
Phys. Rev. D 101, 073007 (2020)
|
10.1103/PhysRevD.101.073007
|
HIP-2019-28/TH
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Despite great agreement with experiment, the Standard Model (SM) of particle
physics lacks a viable Dark Matter (DM) candidate and sufficient amount of
CP-violation to account for the observed baryon excess in the universe.
Non-minimal Higgs frameworks are economic extensions of the SM which could
remedy these shortcomings. Within the framework of a three Higgs doublet model,
we introduce an extended dark sector which accommodates both DM and
CP-violation. Such dark sources of CP-violation do not contribute to the
Electric Dipole Moments and are therefore unconstrained. We present a novel
mechanism in which the CP-violating dark particles only interact with the SM
through the gauge bosons, primarily the $Z$ boson. Such $Z$-portal dark CP
violation is realised in the regions of the parameter space where
Higgs-mediated (co)annihilation processes are sub-dominant and have negligible
contributions to the DM relic density. We show that such $Z$-portal CP
violating DM can still thermalise and satisfy all experimental and
observational bounds and discuss the implications of such phenomena for
electroweak baryogenesis.
|
[
{
"created": "Thu, 19 Sep 2019 21:03:32 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Apr 2020 03:11:47 GMT",
"version": "v2"
}
] |
2020-05-06
|
[
[
"Keus",
"Venus",
""
]
] |
Despite great agreement with experiment, the Standard Model (SM) of particle physics lacks a viable Dark Matter (DM) candidate and sufficient amount of CP-violation to account for the observed baryon excess in the universe. Non-minimal Higgs frameworks are economic extensions of the SM which could remedy these shortcomings. Within the framework of a three Higgs doublet model, we introduce an extended dark sector which accommodates both DM and CP-violation. Such dark sources of CP-violation do not contribute to the Electric Dipole Moments and are therefore unconstrained. We present a novel mechanism in which the CP-violating dark particles only interact with the SM through the gauge bosons, primarily the $Z$ boson. Such $Z$-portal dark CP violation is realised in the regions of the parameter space where Higgs-mediated (co)annihilation processes are sub-dominant and have negligible contributions to the DM relic density. We show that such $Z$-portal CP violating DM can still thermalise and satisfy all experimental and observational bounds and discuss the implications of such phenomena for electroweak baryogenesis.
|
2104.04459
|
Sarira Sahu
|
Jos\'e F. Nieves, Sarira Sahu
|
Taming the pinch singularities in the two-loop neutrino self-energy in a
medium
|
26 pages, 3 figures, Updated to incorporate the corrections made in
the text and some references in the published version
|
Phys. Rev. D 103, 116026 (2021)
|
10.1103/PhysRevD.103.116026
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We consider the calculation of the thermal self-energy of a neutrino that
propagates in a medium composed of fermions and scalars interacting via a
Yukawa-type coupling, in the case that the neutri no energy is much larger than
the fermion and scalar masses, as well as the temperature and chemical
potentials of the background. In this kinematic regime the one-loop
contribution to the imaginary part of the self-energy is negligible. We
consider the two-loop contribution and we encounter the so-called pinch
singularities which are known to arise in higher loop self-energy calculations
in Thermal Field Theory. With a judicious use of the properties and
parametrizations of the thermal propagators the singularities are treated
effectively and actually disappear. From the imaginary part of the self-energy,
we obtain a precise formula for the damping matrix expressed in terms of
integrals over the background particle distributions. The formulas predict a
specific dependence of the damping terms on the neutrino energy, depending on
the background conditions. For guidance to estimating the effects in specific
contexts, we compute the damping terms for several limiting cases of the
momentum distribution functions of the background particles. We discuss briefly
the connection between the results of our calculations for the damping matrix
and the decoherence effects described in terms of the Lindblad equation.
|
[
{
"created": "Fri, 9 Apr 2021 16:17:43 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jul 2021 11:45:36 GMT",
"version": "v2"
}
] |
2021-07-07
|
[
[
"Nieves",
"José F.",
""
],
[
"Sahu",
"Sarira",
""
]
] |
We consider the calculation of the thermal self-energy of a neutrino that propagates in a medium composed of fermions and scalars interacting via a Yukawa-type coupling, in the case that the neutri no energy is much larger than the fermion and scalar masses, as well as the temperature and chemical potentials of the background. In this kinematic regime the one-loop contribution to the imaginary part of the self-energy is negligible. We consider the two-loop contribution and we encounter the so-called pinch singularities which are known to arise in higher loop self-energy calculations in Thermal Field Theory. With a judicious use of the properties and parametrizations of the thermal propagators the singularities are treated effectively and actually disappear. From the imaginary part of the self-energy, we obtain a precise formula for the damping matrix expressed in terms of integrals over the background particle distributions. The formulas predict a specific dependence of the damping terms on the neutrino energy, depending on the background conditions. For guidance to estimating the effects in specific contexts, we compute the damping terms for several limiting cases of the momentum distribution functions of the background particles. We discuss briefly the connection between the results of our calculations for the damping matrix and the decoherence effects described in terms of the Lindblad equation.
|
1510.06504
|
Masaki Yamada
|
Masaki Yamada, Tsutomu T. Yanagida, Kazuya Yonekura
|
Cosmologically safe QCD axion without fine-tuning
|
5 pages
|
Phys. Rev. Lett. 116, 051801 (2016)
|
10.1103/PhysRevLett.116.051801
|
IPMU 15-0185; DESY 15-189
|
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Although QCD axion models are widely studied as solutions to the strong CP
problem, they generically confront severe fine-tuning problems to guarantee the
anomalous PQ symmetry. In this letter, we propose a simple QCD axion model
without any fine-tunings. We introduce an extra dimension and a pair of extra
quarks living on two branes separately, which is also charged under a bulk
Abelian gauge symmetry. We assume a monopole condensation on our brane at an
intermediate scale, which implies that the extra quarks develop the chiral
symmetry breaking and the PQ symmetry is broken. In contrast to the original
Kim's model, our model explains the origin of the PQ symmetry thanks to the
extra dimension and avoids the cosmological domain wall problem because of the
chiral symmetry breaking in the Abelian gauge theory.
|
[
{
"created": "Thu, 22 Oct 2015 07:36:31 GMT",
"version": "v1"
}
] |
2016-02-10
|
[
[
"Yamada",
"Masaki",
""
],
[
"Yanagida",
"Tsutomu T.",
""
],
[
"Yonekura",
"Kazuya",
""
]
] |
Although QCD axion models are widely studied as solutions to the strong CP problem, they generically confront severe fine-tuning problems to guarantee the anomalous PQ symmetry. In this letter, we propose a simple QCD axion model without any fine-tunings. We introduce an extra dimension and a pair of extra quarks living on two branes separately, which is also charged under a bulk Abelian gauge symmetry. We assume a monopole condensation on our brane at an intermediate scale, which implies that the extra quarks develop the chiral symmetry breaking and the PQ symmetry is broken. In contrast to the original Kim's model, our model explains the origin of the PQ symmetry thanks to the extra dimension and avoids the cosmological domain wall problem because of the chiral symmetry breaking in the Abelian gauge theory.
|
hep-ph/0009341
|
Valery Lyubovitskij
|
V. E. Lyubovitskij (Tuebingen University and Tomsk University), Th.
Gutsche (Tuebingen University), Amand Faessler (Tuebingen University), E.G.
Drukarev (Petersburg Nuclear Physics Institute, Gatchina)
|
Sigma-term physics in the perturbative chiral quark model
|
19 pages, LaTeX-file, 2 Figures
|
Phys.Rev. D63 (2001) 054026
|
10.1103/PhysRevD.63.054026
| null |
hep-ph
| null |
We apply the perturbative chiral quark model (PCQM) at one loop to analyse
meson-baryon sigma-terms. Analytic expressions for these quantities are
obtained in terms of fundamental parameters of low-energy pion-nucleon physics
(weak pion decay constant, axial nucleon coupling, strong pion-nucleon form
factor) and of only one model parameter (radius of the nucleonic three-quark
core). Our result for the piN sigma term of about 45 MeV is in good agreement
with the value deduced by Gasser, Leutwyler and Sainio using
dispersion-relation techniques and exploiting the chiral symmetry constraints.
|
[
{
"created": "Fri, 29 Sep 2000 10:49:47 GMT",
"version": "v1"
},
{
"created": "Sun, 1 Oct 2000 16:51:36 GMT",
"version": "v2"
},
{
"created": "Fri, 8 Dec 2000 13:47:17 GMT",
"version": "v3"
}
] |
2009-10-31
|
[
[
"Lyubovitskij",
"V. E.",
"",
"Tuebingen University and Tomsk University"
],
[
"Gutsche",
"Th.",
"",
"Tuebingen University"
],
[
"Faessler",
"Amand",
"",
"Tuebingen University"
],
[
"Drukarev",
"E. G.",
"",
"Petersburg Nuclear Physics Institute, Gatchina"
]
] |
We apply the perturbative chiral quark model (PCQM) at one loop to analyse meson-baryon sigma-terms. Analytic expressions for these quantities are obtained in terms of fundamental parameters of low-energy pion-nucleon physics (weak pion decay constant, axial nucleon coupling, strong pion-nucleon form factor) and of only one model parameter (radius of the nucleonic three-quark core). Our result for the piN sigma term of about 45 MeV is in good agreement with the value deduced by Gasser, Leutwyler and Sainio using dispersion-relation techniques and exploiting the chiral symmetry constraints.
|
hep-ph/9501340
|
Robert Bruce Mann
|
J.R. Mureika and R.B. Mann
|
Adiabatic Analysis of Gravitationally-Induced Three-Flavor Neutrino
Oscillations
|
Latex, 2 postscript figures
| null | null |
WATPHYS TH-95/01
|
hep-ph astro-ph gr-qc
| null |
Some implications of the proposal that flavor nondiagonal couplings of
neutrinos to gravity might resolve the solar neutrino problem are considered in
the context of three neutrino flavours. Using an adiabatic approximation
iso-SNU curves are calculated for the neutrinos which most likely contribute to
the observed solar neutrino deficiency. We show that results obtained with
two-flavor models can be recovered, and discuss the effects of the addition of
a third flavor. Some results are obtained for this case, and these values are
compared with recent experimental data.
|
[
{
"created": "Thu, 19 Jan 1995 10:23:51 GMT",
"version": "v1"
}
] |
2016-09-01
|
[
[
"Mureika",
"J. R.",
""
],
[
"Mann",
"R. B.",
""
]
] |
Some implications of the proposal that flavor nondiagonal couplings of neutrinos to gravity might resolve the solar neutrino problem are considered in the context of three neutrino flavours. Using an adiabatic approximation iso-SNU curves are calculated for the neutrinos which most likely contribute to the observed solar neutrino deficiency. We show that results obtained with two-flavor models can be recovered, and discuss the effects of the addition of a third flavor. Some results are obtained for this case, and these values are compared with recent experimental data.
|
2105.05700
|
Venus Keus
|
Venus Keus
|
Baryogenesis from a CP-violating inflation
|
10 pages, 5 figures, Contributions to the BSM-2021 conference
proceedings. arXiv admin note: text overlap with arXiv:2102.07777
| null | null | null |
hep-ph gr-qc
|
http://creativecommons.org/licenses/by/4.0/
|
We introduce the novel phenomena of CP-violating inflation in the frameworks
of a 3-Higgs doublet model where the inflaton doublets have a non-minimal
coupling to gravity. We allow for this coupling to be complex, thereby
introducing CP-violation - a necessary source of the baryon asymmetry - in the
inflaton couplings. We investigate the inflationary dynamics of such a
framework and the inflaton decay in the reheating phase. We discuss how the
CP-violation of the model is imprinted on the particle asymmetries.
|
[
{
"created": "Wed, 12 May 2021 14:36:45 GMT",
"version": "v1"
}
] |
2021-05-13
|
[
[
"Keus",
"Venus",
""
]
] |
We introduce the novel phenomena of CP-violating inflation in the frameworks of a 3-Higgs doublet model where the inflaton doublets have a non-minimal coupling to gravity. We allow for this coupling to be complex, thereby introducing CP-violation - a necessary source of the baryon asymmetry - in the inflaton couplings. We investigate the inflationary dynamics of such a framework and the inflaton decay in the reheating phase. We discuss how the CP-violation of the model is imprinted on the particle asymmetries.
|
hep-ph/0607347
|
Alexander Khodjamirian
|
Alexander Khodjamirian
|
Exclusive Charmless $B$ Decays in QCD
|
6 pages, Invited talk at the First Workshop on Theory, Phenomenology
and Experiments in Heavy Flavour Physics, Anacapri, Italy, May 29-31 2006
|
Nucl.Phys.Proc.Suppl.163:139-144,2007
|
10.1016/j.nuclphysbps.2006.09.012
|
SI-HEP-2006-08
|
hep-ph
| null |
The problem of hadronic input in charmless nonleptonic B decays is discussed.
QCD sum rules and their light-cone versions (LCSR) provide an important part of
this input, such as the decay constant $f_B$ and $B\to \pi$ form factor.
Employing the LCSR technique, the $B\to \pi\pi$ hadronic matrix elements with
emission, penguin and annihilation topologies are calculated, with no evidence
for large nonfactorizable effects and/or strong phases.
|
[
{
"created": "Mon, 31 Jul 2006 18:51:09 GMT",
"version": "v1"
}
] |
2011-03-23
|
[
[
"Khodjamirian",
"Alexander",
""
]
] |
The problem of hadronic input in charmless nonleptonic B decays is discussed. QCD sum rules and their light-cone versions (LCSR) provide an important part of this input, such as the decay constant $f_B$ and $B\to \pi$ form factor. Employing the LCSR technique, the $B\to \pi\pi$ hadronic matrix elements with emission, penguin and annihilation topologies are calculated, with no evidence for large nonfactorizable effects and/or strong phases.
|
2306.15431
|
Samuel Abreu
|
Samuel Abreu, Dmitry Chicherin, Harald Ita, Ben Page, Vasily Sotnikov,
Wladimir Tschernow and Simone Zoia
|
All Two-Loop Feynman Integrals for Five-Point One-Mass Scattering
|
Ancillary files can be downloaded from
https://doi.org/10.5281/zenodo.8085740 ; v2 (published version): added
appendix describing the analytic continuation across logarithmic
singularities within the physical region
| null | null | null |
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We compute the complete set of two-loop master integrals for the scattering
of four massless particles and a massive one. Our results are ready for
phenomenological applications, removing a major obstacle to the computation of
complete next-to-next-to-leading order (NNLO) QCD corrections to processes such
as the production of a $H/Z/W$ boson in association with two jets at the LHC.
Furthermore, they open the door to new investigations into the structure of
quantum-field theories and provide precious analytic data for studying the
mathematical properties of Feynman integrals.
|
[
{
"created": "Tue, 27 Jun 2023 12:39:43 GMT",
"version": "v1"
},
{
"created": "Thu, 2 May 2024 11:22:55 GMT",
"version": "v2"
}
] |
2024-05-03
|
[
[
"Abreu",
"Samuel",
""
],
[
"Chicherin",
"Dmitry",
""
],
[
"Ita",
"Harald",
""
],
[
"Page",
"Ben",
""
],
[
"Sotnikov",
"Vasily",
""
],
[
"Tschernow",
"Wladimir",
""
],
[
"Zoia",
"Simone",
""
]
] |
We compute the complete set of two-loop master integrals for the scattering of four massless particles and a massive one. Our results are ready for phenomenological applications, removing a major obstacle to the computation of complete next-to-next-to-leading order (NNLO) QCD corrections to processes such as the production of a $H/Z/W$ boson in association with two jets at the LHC. Furthermore, they open the door to new investigations into the structure of quantum-field theories and provide precious analytic data for studying the mathematical properties of Feynman integrals.
|
hep-ph/0310201
|
Christophe Grojean
|
A. Falkowski, C. Grojean, S. Pokorski
|
Loop Corrections in Higher Dimensions via Deconstruction
|
LaTeX, 13 pages, 1 figure. v2: Refs added and typos corrected in Eqs.
(26)-(27)
|
Phys.Lett. B581 (2004) 236-247
|
10.1016/j.physletb.2003.11.074
| null |
hep-ph
| null |
We calculate the one-loop corrections to the Kaluza-Klein gauge boson
excitations in the deconstructed version of the 5D QED. Deconstruction provides
a renormalizable UV completion of the 5D theory that enables to control the
cut-off dependence of 5D theories and study a possible influence of UV physics
on IR observables. In particular we calculate the cut-off-dependent non-leading
corrections that may be phenomenologically relevant for collider physics. We
also discuss the structure of the operators that are relevant for the quantum
corrections to the gauge boson masses in 5D and in deconstruction.
|
[
{
"created": "Thu, 16 Oct 2003 20:38:20 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Dec 2003 04:19:04 GMT",
"version": "v2"
}
] |
2010-04-05
|
[
[
"Falkowski",
"A.",
""
],
[
"Grojean",
"C.",
""
],
[
"Pokorski",
"S.",
""
]
] |
We calculate the one-loop corrections to the Kaluza-Klein gauge boson excitations in the deconstructed version of the 5D QED. Deconstruction provides a renormalizable UV completion of the 5D theory that enables to control the cut-off dependence of 5D theories and study a possible influence of UV physics on IR observables. In particular we calculate the cut-off-dependent non-leading corrections that may be phenomenologically relevant for collider physics. We also discuss the structure of the operators that are relevant for the quantum corrections to the gauge boson masses in 5D and in deconstruction.
|
hep-ph/9603241
| null |
Erich Holtmann, Masahiro Kawasaki and Takeo Moroi
|
Solving the Crisis in Big-Bang Nucleosynthesis by the Radiative Decay of
an Exotic Particle
| null |
Phys.Rev.Lett. 77 (1996) 3712-3715
|
10.1103/PhysRevLett.77.3712
| null |
hep-ph astro-ph
| null |
We discuss a new mechanism which can solve the crisis in standard big-bang
nucleosynthesis. A long-lived particle $X$ ($10^4 sec \lesssim \tau_X \lesssim
10^6 sec$) which decays into photon(s) will induce cascade photons, and destroy
significant amounts of D and $^3$He without destroying $^4$He or too much
$^7$Li. We numerically investigate this process and derive a constraint on the
properties of $X$ such that the theoretical values of the primordial
light-element abundances agree with observation. We also present some
candidates for the unstable particle $X$.
|
[
{
"created": "Wed, 6 Mar 1996 18:54:12 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Oct 1996 04:07:43 GMT",
"version": "v2"
}
] |
2016-09-01
|
[
[
"Holtmann",
"Erich",
""
],
[
"Kawasaki",
"Masahiro",
""
],
[
"Moroi",
"Takeo",
""
]
] |
We discuss a new mechanism which can solve the crisis in standard big-bang nucleosynthesis. A long-lived particle $X$ ($10^4 sec \lesssim \tau_X \lesssim 10^6 sec$) which decays into photon(s) will induce cascade photons, and destroy significant amounts of D and $^3$He without destroying $^4$He or too much $^7$Li. We numerically investigate this process and derive a constraint on the properties of $X$ such that the theoretical values of the primordial light-element abundances agree with observation. We also present some candidates for the unstable particle $X$.
|
hep-ph/0603134
|
Jose Antonio Oller
|
Jose A. Oller
|
On the Strangeness -1 S-wave Meson-Baryon Scattering
|
35 pages, 7 figures, 12 tables
|
Eur.Phys.J.A28:63-82,2006
|
10.1140/epja/i2006-10011-3
| null |
hep-ph nucl-th
| null |
We consider meson-baryon interactions in S-wave with strangeness -1. This is
a non-perturbative sector populated by plenty of resonances interacting in
several two-body coupled channels.We study this sector combining a large set of
experimental data. The recent experiments are remarkably accurate demanding a
sound theoretical description to account for all the data. We employ unitary
chiral perturbation theory up to and including \cal{O}(p^2) to accomplish this
aim. The spectroscopy of our solutions is studied within this approach,
discussing the rise from the pole content of the two \Lambda(1405) resonances
and of the \Lambda(1670), \Lambda(1800), \Sigma(1480), \Sigma(1620) and
\Sigma(1750). We finally argue about our preferred solution.
|
[
{
"created": "Fri, 17 Mar 2006 14:58:18 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Oller",
"Jose A.",
""
]
] |
We consider meson-baryon interactions in S-wave with strangeness -1. This is a non-perturbative sector populated by plenty of resonances interacting in several two-body coupled channels.We study this sector combining a large set of experimental data. The recent experiments are remarkably accurate demanding a sound theoretical description to account for all the data. We employ unitary chiral perturbation theory up to and including \cal{O}(p^2) to accomplish this aim. The spectroscopy of our solutions is studied within this approach, discussing the rise from the pole content of the two \Lambda(1405) resonances and of the \Lambda(1670), \Lambda(1800), \Sigma(1480), \Sigma(1620) and \Sigma(1750). We finally argue about our preferred solution.
|
1610.00426
|
Tom\'a\v{s} Brauner
|
Tomas Brauner and Xu-Guang Huang
|
Vector meson condensation in a pion superfluid
|
12 pages, 4 figures; v2: added references, matches published version
|
Phys. Rev. D 94, 094003 (2016)
|
10.1103/PhysRevD.94.094003
| null |
hep-ph hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We revisit the suggestion that charged rho-mesons undergo Bose-Einstein
condensation in isospin-rich nuclear matter. Using a simple version of the
Nambu-Jona-Lasinio (NJL) model, we conclude that rho-meson condensation is
either avoided or postponed to isospin chemical potentials much higher than the
rho-meson mass as a consequence of the repulsive interaction with the preformed
pion condensate. In order to support our numerical results, we work out a
linear sigma model for pions and rho-mesons, showing that the two models lead
to similar patterns of medium dependence of meson masses. As a byproduct, we
analyze in detail the mapping between the NJL model and the linear sigma model,
focusing on conditions that must be satisfied for a quantitative agreement
between the models.
|
[
{
"created": "Mon, 3 Oct 2016 06:56:06 GMT",
"version": "v1"
},
{
"created": "Sat, 5 Nov 2016 09:28:03 GMT",
"version": "v2"
}
] |
2016-11-08
|
[
[
"Brauner",
"Tomas",
""
],
[
"Huang",
"Xu-Guang",
""
]
] |
We revisit the suggestion that charged rho-mesons undergo Bose-Einstein condensation in isospin-rich nuclear matter. Using a simple version of the Nambu-Jona-Lasinio (NJL) model, we conclude that rho-meson condensation is either avoided or postponed to isospin chemical potentials much higher than the rho-meson mass as a consequence of the repulsive interaction with the preformed pion condensate. In order to support our numerical results, we work out a linear sigma model for pions and rho-mesons, showing that the two models lead to similar patterns of medium dependence of meson masses. As a byproduct, we analyze in detail the mapping between the NJL model and the linear sigma model, focusing on conditions that must be satisfied for a quantitative agreement between the models.
|
2311.12112
|
Hooman Davoudiasl
|
Hooman Davoudiasl and Pier Paolo Giardino
|
Electron $g-2$ Foreshadowing Discoveries at FCC-ee
|
6 pages 4 figures. Ancillary files containing digital data are
submitted as text files (can be obtained from the source file)
| null | null | null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
A future $e^+e^-$ circular collider (FCC-ee) may provide a unique probe of
the electron Yukawa coupling through Higgs boson production on resonance.
Motivated by this exciting possibility, we examine a simple model which can
result in $\mathcal{O}(10)$ modifications of the Higgs coupling to electrons.
The model can also lead to deviations in the electron anomalous magnetic
moment, $g_e-2$, which at present shows a $+2.2\sigma$ or $-3.7\sigma$
deviation, implied by differing precision determinations of the electromagnetic
fine structure constant. The electron $g_e-2$ can be a forerunner for FCC-ee
discoveries which, as we elucidate, may not be accessible to the
high-luminosity LHC measurements. A simple extension of our model can also
account for the current deviation in the muon $g_\mu-2$.
|
[
{
"created": "Mon, 20 Nov 2023 19:00:05 GMT",
"version": "v1"
}
] |
2023-11-22
|
[
[
"Davoudiasl",
"Hooman",
""
],
[
"Giardino",
"Pier Paolo",
""
]
] |
A future $e^+e^-$ circular collider (FCC-ee) may provide a unique probe of the electron Yukawa coupling through Higgs boson production on resonance. Motivated by this exciting possibility, we examine a simple model which can result in $\mathcal{O}(10)$ modifications of the Higgs coupling to electrons. The model can also lead to deviations in the electron anomalous magnetic moment, $g_e-2$, which at present shows a $+2.2\sigma$ or $-3.7\sigma$ deviation, implied by differing precision determinations of the electromagnetic fine structure constant. The electron $g_e-2$ can be a forerunner for FCC-ee discoveries which, as we elucidate, may not be accessible to the high-luminosity LHC measurements. A simple extension of our model can also account for the current deviation in the muon $g_\mu-2$.
|
hep-ph/0312069
|
Gudrid Moortgat-Pick
|
K. Desch, J. Kalinowski, G. Moortgat-Pick, M.M. Nojiri and G.
Polesello
|
SUSY Parameter Determination in Combined Analyses at LHC/LC
|
16 pages, 6 figures
|
JHEP 0402 (2004) 035
|
10.1088/1126-6708/2004/02/035
|
IFT-03/34, IPPP-03-59, DCPT-03-118
|
hep-ph
| null |
We demonstrate how the interplay of a future e^+e^- LC at its first stage
with sqrt{s} sim 500 GeV and of the LHC could lead to a precise determination
of the fundamental SUSY parameters in the gaugino/higgsino sector without
assuming a specific supersymmetry breaking scheme. We demonstrate this for the
benchmark scenario SPS1a, taking into account realistic errors for the masses
and cross sections measured at the LC with polarised beams, including errors
coming from polarisation measurements, and mass measurements at the LHC. The
results clearly demonstrate the complementarity of the LHC and LC, and the
benefit from the joint analyses of their data.
|
[
{
"created": "Thu, 4 Dec 2003 18:24:05 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Desch",
"K.",
""
],
[
"Kalinowski",
"J.",
""
],
[
"Moortgat-Pick",
"G.",
""
],
[
"Nojiri",
"M. M.",
""
],
[
"Polesello",
"G.",
""
]
] |
We demonstrate how the interplay of a future e^+e^- LC at its first stage with sqrt{s} sim 500 GeV and of the LHC could lead to a precise determination of the fundamental SUSY parameters in the gaugino/higgsino sector without assuming a specific supersymmetry breaking scheme. We demonstrate this for the benchmark scenario SPS1a, taking into account realistic errors for the masses and cross sections measured at the LC with polarised beams, including errors coming from polarisation measurements, and mass measurements at the LHC. The results clearly demonstrate the complementarity of the LHC and LC, and the benefit from the joint analyses of their data.
|
hep-ph/0204155
|
Perivolaropoulos Leandros
|
L. Perivolaropoulos and C. Sourdis
|
Cosmological Effects of Radion Oscillations
|
Accepted in Phys. Rev. D. Clarifying comments added in the text and
some additional references included
|
Phys.Rev. D66 (2002) 084018
|
10.1103/PhysRevD.66.084018
| null |
hep-ph astro-ph gr-qc hep-th
| null |
We show that the redshift of pressureless matter density due to the expansion
of the universe generically induces small oscillations in the stabilized radius
of extra dimensions (the radion field). The frequency of these oscillations is
proportional to the mass of the radion and can have interesting cosmological
consequences. For very low radion masses $m_b$ ($m_b\sim10-100
H_0\simeq10^{-32} eV$) these low frequency oscillations lead to oscillations in
the expansion rate of the universe. The occurrence of acceleration periods
could naturally lead to a resolution of the coincidence problem, without need
of dark energy. Even though this scenario for low radion mass is consistent
with several observational tests it has difficulty to meet fifth force
constraints. If viewed as an effective Brans-Dicke theory it predicts
$\omega=-1+\frac{1}{D}$ ($D$ is the number of extra dimensions), while
experiments on scales larger than $1mm$ imply $\omega>2500$. By deriving the
generalized Newtonian potential corresponding to a massive toroidally compact
radion we demonstrate that Newtonian gravity is modified only on scales smaller
than $m_b^{-1}$. Thus, these constraints do not apply for $m_b>10^{-3} eV$
(high frequency oscillations) corresponding to scales less than the current
experiments ($0.3mm$). Even though these high frequency oscillations can not
resolve the coincidence problem they provide a natural mechanism for dark
matter generation. This type of dark matter has many similarities with the
axion.
|
[
{
"created": "Mon, 15 Apr 2002 06:11:12 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Aug 2002 16:12:03 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Perivolaropoulos",
"L.",
""
],
[
"Sourdis",
"C.",
""
]
] |
We show that the redshift of pressureless matter density due to the expansion of the universe generically induces small oscillations in the stabilized radius of extra dimensions (the radion field). The frequency of these oscillations is proportional to the mass of the radion and can have interesting cosmological consequences. For very low radion masses $m_b$ ($m_b\sim10-100 H_0\simeq10^{-32} eV$) these low frequency oscillations lead to oscillations in the expansion rate of the universe. The occurrence of acceleration periods could naturally lead to a resolution of the coincidence problem, without need of dark energy. Even though this scenario for low radion mass is consistent with several observational tests it has difficulty to meet fifth force constraints. If viewed as an effective Brans-Dicke theory it predicts $\omega=-1+\frac{1}{D}$ ($D$ is the number of extra dimensions), while experiments on scales larger than $1mm$ imply $\omega>2500$. By deriving the generalized Newtonian potential corresponding to a massive toroidally compact radion we demonstrate that Newtonian gravity is modified only on scales smaller than $m_b^{-1}$. Thus, these constraints do not apply for $m_b>10^{-3} eV$ (high frequency oscillations) corresponding to scales less than the current experiments ($0.3mm$). Even though these high frequency oscillations can not resolve the coincidence problem they provide a natural mechanism for dark matter generation. This type of dark matter has many similarities with the axion.
|
1512.09212
|
Emanuela Dimastrogiovanni Dr
|
Emanuela Dimastrogiovanni, Lawrence M. Krauss, Jens Chluba
|
Constraints on Gravitino Decay and the Scale of Inflation using CMB
spectral distortions
|
submitted to Phys. Rev D., 8 pages, 4 figs (1 new figure added,
references updated)
|
Phys. Rev. D 94, 023518 (2016)
|
10.1103/PhysRevD.94.023518
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
If local supersymmetry is the correct extension of the standard model of
particle physics, then following Inflation the early universe would have been
populated by gravitinos produced from scatterings in the hot plasma during
reheating. Their abundance is directly related to the magnitude of the
reheating temperature. The gravitino lifetime is fixed as a function of its
mass, and for gravitinos with lifetimes longer than the age of the universe at
redshift $z\simeq 2\times 10^{6}$ (or roughly $6\times 10^6{\rm s}$), decay
products can produce spectral distortion of the cosmic microwave background.
Currently available COBE/FIRAS limits on spectral distortion can, in certain
cases, already be competitive with respect to cosmological constraints from
primordial nucleosynthesis for some gravitino decay scenarios. We show how the
sensitivity limits on $\mu$ and $y$ distortions that can be reached with
current technology would improve constraints and possibly rule out a
significant portion of the parameter space for gravitino masses and Inflation
reheating temperatures.
|
[
{
"created": "Thu, 31 Dec 2015 04:44:03 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Jan 2016 20:40:03 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Feb 2016 17:32:02 GMT",
"version": "v3"
}
] |
2016-07-27
|
[
[
"Dimastrogiovanni",
"Emanuela",
""
],
[
"Krauss",
"Lawrence M.",
""
],
[
"Chluba",
"Jens",
""
]
] |
If local supersymmetry is the correct extension of the standard model of particle physics, then following Inflation the early universe would have been populated by gravitinos produced from scatterings in the hot plasma during reheating. Their abundance is directly related to the magnitude of the reheating temperature. The gravitino lifetime is fixed as a function of its mass, and for gravitinos with lifetimes longer than the age of the universe at redshift $z\simeq 2\times 10^{6}$ (or roughly $6\times 10^6{\rm s}$), decay products can produce spectral distortion of the cosmic microwave background. Currently available COBE/FIRAS limits on spectral distortion can, in certain cases, already be competitive with respect to cosmological constraints from primordial nucleosynthesis for some gravitino decay scenarios. We show how the sensitivity limits on $\mu$ and $y$ distortions that can be reached with current technology would improve constraints and possibly rule out a significant portion of the parameter space for gravitino masses and Inflation reheating temperatures.
|
hep-ph/0010025
|
John Sender
|
John Sender
|
Techniques for the Top Squark Search at the Fermilab Tevatron
|
PhD thesis, 111 pages
| null | null |
UH-511-967-00
|
hep-ph
| null |
This dissertation addresses the question of how to detect light top squarks
at the upgraded Fermilab Tevatron collider. After a brief introduction to
supersymmetry, the basic phenomenology of the light stop is reviewed and the
current experimental situation is surveyed. The analysis presented here is
based on collider event simulations. The main decay modes accessible to the
Tevatron are studied, feasible discovery channels are identified, and recipes
for experimental analysis are proposed. It is found that stops with masses up
to the top quark mass are liable to detection under these schemes with the data
from a few years' running at the upgraded Tevatron. With such an extended run,
significant portions of parameter space may be probed.
|
[
{
"created": "Wed, 4 Oct 2000 02:59:30 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Sender",
"John",
""
]
] |
This dissertation addresses the question of how to detect light top squarks at the upgraded Fermilab Tevatron collider. After a brief introduction to supersymmetry, the basic phenomenology of the light stop is reviewed and the current experimental situation is surveyed. The analysis presented here is based on collider event simulations. The main decay modes accessible to the Tevatron are studied, feasible discovery channels are identified, and recipes for experimental analysis are proposed. It is found that stops with masses up to the top quark mass are liable to detection under these schemes with the data from a few years' running at the upgraded Tevatron. With such an extended run, significant portions of parameter space may be probed.
|
1908.09360
|
Kenji Fukushima
|
Yuki Fujimoto, Kenji Fukushima, Wolfram Weise
|
Continuity from neutron matter to two-flavor quark matter with $^1 S_0$
and $^3 P_2$ superfluidity
|
14 pages, 5 figures; minor updates to promote correctness in
discussions
|
Phys. Rev. D 101, 094009 (2020)
|
10.1103/PhysRevD.101.094009
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This study is performed with the aim of gaining insights into the possible
applicability of the quark-hadron continuity concept, not only in the idealized
case of three-flavor symmetric quark matter, but also for the transition from
neutron matter to two-flavor quark matter. A key issue is the continuity
between neutron superfluidity and a corresponding superfluid quark phase
produced by $d$-quark pairing. Symmetry arguments are developed and relevant
dynamical mechanisms are analyzed. It is pointed out that the $^3P_2$
superfluidity in dense neutron matter has a direct analogue in the $^3P_2$
pairing of $d$-quarks in two-flavor quark matter. This observation supports the
idea that the quark-hadron continuity hypothesis may be valid for such systems.
Possible implications for neutron stars are briefly discussed.
|
[
{
"created": "Sun, 25 Aug 2019 16:48:59 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Jan 2020 06:59:04 GMT",
"version": "v2"
}
] |
2020-05-20
|
[
[
"Fujimoto",
"Yuki",
""
],
[
"Fukushima",
"Kenji",
""
],
[
"Weise",
"Wolfram",
""
]
] |
This study is performed with the aim of gaining insights into the possible applicability of the quark-hadron continuity concept, not only in the idealized case of three-flavor symmetric quark matter, but also for the transition from neutron matter to two-flavor quark matter. A key issue is the continuity between neutron superfluidity and a corresponding superfluid quark phase produced by $d$-quark pairing. Symmetry arguments are developed and relevant dynamical mechanisms are analyzed. It is pointed out that the $^3P_2$ superfluidity in dense neutron matter has a direct analogue in the $^3P_2$ pairing of $d$-quarks in two-flavor quark matter. This observation supports the idea that the quark-hadron continuity hypothesis may be valid for such systems. Possible implications for neutron stars are briefly discussed.
|
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