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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9807328
|
Rainer Jakob
|
J. Bolz, R. Jakob, P. Kroll and N. G. Stefanis
|
Comment on the paper: ``The perturbative proton form factor reexamined''
by Kundu et al
|
3 pages, RevTeX is used, no figures
| null | null |
RUB-TPII-11/98, WU-B 98-23
|
hep-ph
| null |
We point out some serious problems in the investigation of Kundu et al. which
claims agreement with the existing data of the proton form factor, calculated
without taking into account the intrinsic k_{perp}-dependence of the proton
wave function.
|
[
{
"created": "Fri, 10 Jul 1998 12:38:24 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Bolz",
"J.",
""
],
[
"Jakob",
"R.",
""
],
[
"Kroll",
"P.",
""
],
[
"Stefanis",
"N. G.",
""
]
] |
We point out some serious problems in the investigation of Kundu et al. which claims agreement with the existing data of the proton form factor, calculated without taking into account the intrinsic k_{perp}-dependence of the proton wave function.
|
2102.01317
|
Seong Youl Choi
|
Seong Youl Choi, Jae Hoon Jeong
|
Vector currents of integer-spin Majorana particles
|
23 pages, 4 figures, 2 tables
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A general and comprehensive analysis for the vector currents of two massive
particles, $X_2$ and $X_1$, with arbitrary integer-spin values is given. Our
special focus is on the case when two particles are charge self-conjugate, i.e.
Majorana bosons. The general structure of their couplings to an on-shell or
off-shell vector boson $V$ is described in a manifestly covariant way and then
the constraints on the triple vertex due to discrete CP symmetry and the
Majorana condition of two particles being Majorana are worked out. The validity
of our full analytic investigation is checked by studying the two-body decay,
$X_2\to V X_1$, with an on-shell or off-shell $V$ boson in the helicity
formalism complementary to the covariant formulation. Threshold effects of the
two-lepton invariant-mass and polar-angle correlations in the two sequential
two-body decays, $X_2\to V X_1$ and $V\to \ell^-\ell^+$ with $\ell=e$ or $\mu$,
are derived analytically in a compact form by use of the Wick helicity rotation
and they are investigated numerically in a few specific spin-combination
scenarios for probing the spin and dynamical structure of the $X_2X_1V$ vertex.
|
[
{
"created": "Tue, 2 Feb 2021 05:18:17 GMT",
"version": "v1"
}
] |
2021-02-03
|
[
[
"Choi",
"Seong Youl",
""
],
[
"Jeong",
"Jae Hoon",
""
]
] |
A general and comprehensive analysis for the vector currents of two massive particles, $X_2$ and $X_1$, with arbitrary integer-spin values is given. Our special focus is on the case when two particles are charge self-conjugate, i.e. Majorana bosons. The general structure of their couplings to an on-shell or off-shell vector boson $V$ is described in a manifestly covariant way and then the constraints on the triple vertex due to discrete CP symmetry and the Majorana condition of two particles being Majorana are worked out. The validity of our full analytic investigation is checked by studying the two-body decay, $X_2\to V X_1$, with an on-shell or off-shell $V$ boson in the helicity formalism complementary to the covariant formulation. Threshold effects of the two-lepton invariant-mass and polar-angle correlations in the two sequential two-body decays, $X_2\to V X_1$ and $V\to \ell^-\ell^+$ with $\ell=e$ or $\mu$, are derived analytically in a compact form by use of the Wick helicity rotation and they are investigated numerically in a few specific spin-combination scenarios for probing the spin and dynamical structure of the $X_2X_1V$ vertex.
|
hep-ph/0109227
|
Akira Niegawa
|
N. Asida, A. Ni\'egawa, H. Ozaki, M. Kubota
|
Rates of neutrino conversion and decay in hot and dense QED plasma
|
27 pages and 13 figures
|
Phys.Rev. D65 (2002) 056007
|
10.1103/PhysRevD.65.056007
|
OCU-PHYS-182, September 2001
|
hep-ph
| null |
Using a real-time formalism of equilibrium and nonequilibrium quantum-field
theory, we derive the reaction-rate formula for neutrino-conversion ($\nu \to
\nu'$) process and $\nu \bar{\nu}'$ annihilation process, which take place in a
hot and dense QED plasma with background (anti)neutrinos out of equilibrium.
Also derived is the formula for the inverse processes to the above ones. Using
the hard-thermal-loop resummation scheme, we include the contribution from the
coherent processes. The decay/production of a neutrino causes an evolution of
its spatial distribution. A scheme for dealing with this evolution is
presented. For the case of isotropic neutrino distribution, numerical
computation is carried out for the parameter region of type-II super-nova
explosion. Defferential reaction rate exhibits characteristic peak structure,
which comes from the coherent processes. The contribution from the above
processes to the decay or damping rate of a parent neutrino $\nu$ is also
studied.
|
[
{
"created": "Tue, 25 Sep 2001 08:53:17 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Nov 2001 09:06:43 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Asida",
"N.",
""
],
[
"Niégawa",
"A.",
""
],
[
"Ozaki",
"H.",
""
],
[
"Kubota",
"M.",
""
]
] |
Using a real-time formalism of equilibrium and nonequilibrium quantum-field theory, we derive the reaction-rate formula for neutrino-conversion ($\nu \to \nu'$) process and $\nu \bar{\nu}'$ annihilation process, which take place in a hot and dense QED plasma with background (anti)neutrinos out of equilibrium. Also derived is the formula for the inverse processes to the above ones. Using the hard-thermal-loop resummation scheme, we include the contribution from the coherent processes. The decay/production of a neutrino causes an evolution of its spatial distribution. A scheme for dealing with this evolution is presented. For the case of isotropic neutrino distribution, numerical computation is carried out for the parameter region of type-II super-nova explosion. Defferential reaction rate exhibits characteristic peak structure, which comes from the coherent processes. The contribution from the above processes to the decay or damping rate of a parent neutrino $\nu$ is also studied.
|
hep-ph/0012191
|
Thomas Binoth
|
T. Binoth (1,2), J. Ph. Guillet (1), E. Pilon (1), M. Werlen (1),
((1)LAPTH, Annecy, (2) University of Edinburgh)
|
Beyond leading order effects in photon pair production at the Tevatron
|
11 pages, 5 eps figures, uses feynmf.sty
|
Phys.Rev. D63 (2001) 114016
|
10.1103/PhysRevD.63.114016
|
LAPTH-820/00, Edinburgh 2000/28
|
hep-ph
| null |
We discuss effects induced by beyond leading order contributions to photon
pair production. We point out that next to leading order contributions to the
fragmentation component of the signal lead to a change in the shape of
distributions. This is already mildly visible in present Tevatron data though
stringent isolation criteria tend to suppress the fragmentation component
considerably. We expect the effect to be experimentally confirmed in future
data samples with higher statistics which would serve as a precision test for
QCD.
|
[
{
"created": "Fri, 15 Dec 2000 13:40:37 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Binoth",
"T.",
"",
"LAPTH, Annecy",
"University of Edinburgh"
],
[
"Guillet",
"J. Ph.",
"",
"LAPTH, Annecy"
],
[
"Pilon",
"E.",
"",
"LAPTH, Annecy"
],
[
"Werlen",
"M.",
"",
"LAPTH, Annecy"
]
] |
We discuss effects induced by beyond leading order contributions to photon pair production. We point out that next to leading order contributions to the fragmentation component of the signal lead to a change in the shape of distributions. This is already mildly visible in present Tevatron data though stringent isolation criteria tend to suppress the fragmentation component considerably. We expect the effect to be experimentally confirmed in future data samples with higher statistics which would serve as a precision test for QCD.
|
hep-ph/0002025
|
Sheldon Stone
|
Sheldon Stone
|
Future B Experiments from The BTeV/LHC-b Perspective
|
Presented at the 3rd International Conference on B Physics and CP
Violation, Taipei, December 3-7, 1999 15 pages, 10 figures
| null |
10.1142/9789812791870_0067
| null |
hep-ph hep-ex
| null |
Many measurements are necessary in the program of studying mixing, CP
violation and rare decays of b and c quarks. These measurements require large
numbers of B^o, B_s, B^- and D^{*+} hadrons. Fortunately, copius production of
particles containing b and c quarks will occur at Tevatron and the LHC. The
crucial measurements are described here, as well as the design of the two
experiments, LHC-b and BTeV, that can exploit the 4-20 x 10^{11} b hadrons
produced every 10^7 seconds.
|
[
{
"created": "Wed, 2 Feb 2000 14:57:59 GMT",
"version": "v1"
}
] |
2016-11-23
|
[
[
"Stone",
"Sheldon",
""
]
] |
Many measurements are necessary in the program of studying mixing, CP violation and rare decays of b and c quarks. These measurements require large numbers of B^o, B_s, B^- and D^{*+} hadrons. Fortunately, copius production of particles containing b and c quarks will occur at Tevatron and the LHC. The crucial measurements are described here, as well as the design of the two experiments, LHC-b and BTeV, that can exploit the 4-20 x 10^{11} b hadrons produced every 10^7 seconds.
|
0906.5194
|
Tetsuya Onogi
|
Tetuya Onogi
|
Recent Progress in Lattice QCD
|
12 pages, 7 figures, talk at ICHEP08, Philadelphia, 2008
|
Int.J.Mod.Phys.A24:4607-4622,2009
|
10.1142/S0217751X09046825
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In recent years, reallistic unquenched QCD simulations have been carried out
with various lattice actions. In this report, I explain the progress in theory
and algorithms and some of the physics results.
|
[
{
"created": "Mon, 29 Jun 2009 02:12:34 GMT",
"version": "v1"
}
] |
2009-12-15
|
[
[
"Onogi",
"Tetuya",
""
]
] |
In recent years, reallistic unquenched QCD simulations have been carried out with various lattice actions. In this report, I explain the progress in theory and algorithms and some of the physics results.
|
1704.03363
|
Vincent Theeuwes
|
Anna Kulesza, Leszek Motyka, Tomasz Stebel and Vincent Theeuwes
|
Associated $t \bar{t} H$ production at the LHC: theoretical predictions
at NLO+NNLL accuracy
|
21 pages, 9 figures; NNLL results accounting now for color
decomposition of the one-loop hard function, discussion of the literature
added, typos corrected
|
Phys. Rev. D 97, 114007 (2018)
|
10.1103/PhysRevD.97.114007
|
MS-TP-17-06
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform threshold resummation of soft gluon corrections to the total cross
section and the invariant mass distribution for the process $pp \to t\bar{t}H$.
The resummation is carried out at next-to-next-to-leading-logarithmic (NNLL)
accuracy using the direct QCD Mellin space technique in the three-particle
invariant mass kinematics. After presenting analytical expressions we discuss
the impact of resummation on the numerical predictions for the associated Higgs
boson production with top quarks at the LHC. We find that NLO+NNLL resummation
leads to predictions for which the central values are remarkably stable with
respect to scale variation and for which theoretical uncertainties are reduced
in comparison to NLO predictions.
|
[
{
"created": "Tue, 11 Apr 2017 15:34:30 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Oct 2017 15:52:09 GMT",
"version": "v2"
}
] |
2018-06-13
|
[
[
"Kulesza",
"Anna",
""
],
[
"Motyka",
"Leszek",
""
],
[
"Stebel",
"Tomasz",
""
],
[
"Theeuwes",
"Vincent",
""
]
] |
We perform threshold resummation of soft gluon corrections to the total cross section and the invariant mass distribution for the process $pp \to t\bar{t}H$. The resummation is carried out at next-to-next-to-leading-logarithmic (NNLL) accuracy using the direct QCD Mellin space technique in the three-particle invariant mass kinematics. After presenting analytical expressions we discuss the impact of resummation on the numerical predictions for the associated Higgs boson production with top quarks at the LHC. We find that NLO+NNLL resummation leads to predictions for which the central values are remarkably stable with respect to scale variation and for which theoretical uncertainties are reduced in comparison to NLO predictions.
|
1412.2530
|
Ryoutaro Watanabe
|
Toru Goto, Yasuhiro Okada, Tetsuo Shindou, Minoru Tanaka and Ryoutaro
Watanabe
|
Lepton flavor violation in the supersymmetric seesaw model after the LHC
8 TeV run
|
25 pages, 7 figures
|
Phys. Rev. D 91, 033007 (2015)
|
10.1103/PhysRevD.91.033007
|
KEK-TH-1774, KU-PH-016, OU-HET 828, CTPU-14-09
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the lepton flavor violation in the supersymmetric seesaw model
taking into account recent experimental improvements, especially for the Higgs
boson mass measurement, direct searches of superpartners and the rare decay of
B_s -> mu+ mu- at the LHC, the neutrino mixing angle of theta_{13} at the
neutrino experiments, and the search of mu -> e gamma at the MEG experiment. We
obtain the latest constraints on the parameters in the supersymmetry breaking
terms and study the effect on the lepton flavor violating decays of tau -> mu
gamma and mu -> e gamma. In particular, we consider two kinds of assumption on
the structures in the Majorana mass matrix and the neutrino Yukawa matrix. In
the case of the Majorana mass matrix proportional to the unit matrix, allowing
non-vanishing CP violating parameters in the neutrino Yukawa matrix, we find
that the branching ratio of tau -> mu gamma can be larger than 10^{-9} within
the improved experimental limit of mu -> e gamma. We also consider the neutrino
Yukawa matrix that includes the mixing only in the second and third
generations, and find that a larger branching ratio of tau -> mu gamma than
10^{-9} is possible with satisfying the recent constraints.
|
[
{
"created": "Mon, 8 Dec 2014 12:01:55 GMT",
"version": "v1"
}
] |
2015-03-05
|
[
[
"Goto",
"Toru",
""
],
[
"Okada",
"Yasuhiro",
""
],
[
"Shindou",
"Tetsuo",
""
],
[
"Tanaka",
"Minoru",
""
],
[
"Watanabe",
"Ryoutaro",
""
]
] |
We study the lepton flavor violation in the supersymmetric seesaw model taking into account recent experimental improvements, especially for the Higgs boson mass measurement, direct searches of superpartners and the rare decay of B_s -> mu+ mu- at the LHC, the neutrino mixing angle of theta_{13} at the neutrino experiments, and the search of mu -> e gamma at the MEG experiment. We obtain the latest constraints on the parameters in the supersymmetry breaking terms and study the effect on the lepton flavor violating decays of tau -> mu gamma and mu -> e gamma. In particular, we consider two kinds of assumption on the structures in the Majorana mass matrix and the neutrino Yukawa matrix. In the case of the Majorana mass matrix proportional to the unit matrix, allowing non-vanishing CP violating parameters in the neutrino Yukawa matrix, we find that the branching ratio of tau -> mu gamma can be larger than 10^{-9} within the improved experimental limit of mu -> e gamma. We also consider the neutrino Yukawa matrix that includes the mixing only in the second and third generations, and find that a larger branching ratio of tau -> mu gamma than 10^{-9} is possible with satisfying the recent constraints.
|
2201.11502
|
David Tucker-Smith
|
Justin Berman, Brian Shuve, and David Tucker-Smith
|
Freeze-in Leptogenesis via Dark-Matter Oscillations
|
24 pages + appendices, 21 figures; added a comment on thermal
corrections to dark matter masses
| null |
10.1103/PhysRevD.105.095027
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the cosmology and phenomenology of freeze-in baryogenesis via
dark-matter oscillations, taking the dark matter to couple to Standard Model
leptons. We investigate viable models both with and without a $Z_2$ symmetry
under which all new fields are charged. Lepton flavor effects are important for
leptogenesis in these models, and we identify scenarios in which the baryon
asymmetry is parametrically distinct from and enhanced relative to leptogenesis
from sterile neutrino oscillations. The models we study predict the existence
of new, electroweak-charged fields, and can be tested by a combination of
collider searches, structure-formation studies, X-ray observations, and
terrestrial low-energy tests.
|
[
{
"created": "Thu, 27 Jan 2022 13:33:16 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Feb 2022 21:57:33 GMT",
"version": "v2"
}
] |
2022-06-01
|
[
[
"Berman",
"Justin",
""
],
[
"Shuve",
"Brian",
""
],
[
"Tucker-Smith",
"David",
""
]
] |
We study the cosmology and phenomenology of freeze-in baryogenesis via dark-matter oscillations, taking the dark matter to couple to Standard Model leptons. We investigate viable models both with and without a $Z_2$ symmetry under which all new fields are charged. Lepton flavor effects are important for leptogenesis in these models, and we identify scenarios in which the baryon asymmetry is parametrically distinct from and enhanced relative to leptogenesis from sterile neutrino oscillations. The models we study predict the existence of new, electroweak-charged fields, and can be tested by a combination of collider searches, structure-formation studies, X-ray observations, and terrestrial low-energy tests.
|
1007.0865
|
Chul Kim
|
Ahmad Idilbi, Chul Kim, Thomas Mehen
|
Pair Production of Color-Octet Scalars at the LHC
|
19 pages, 5 figures, published version
|
Phys.Rev.D82:075017,2010
|
10.1103/PhysRevD.82.075017
|
CERN-PH-TH/2010-153
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Heavy colored scalar particles, which exist in many models of new physics,
can be pair produced at the Large Hadron Collider (LHC) via gluon-gluon fusion
and possibly form quarkonium-like bound states. If the scalars are also charged
under the electroweak gauge group, these bound states can then decay into
electroweak bosons. This yields a resonant cross section for final states such
as gamma gamma that can exceed Standard Model backgrounds. This paper studies
this process in the Manohar-Wise model of color-octet scalars (COS). Important
threshold logarithms and final state Coulomb-like QCD interactions are resummed
using effective field theory. We compute the resummed cross section for
gluon-gluon fusion to COS pairs at the LHC as well as the resonant cross
section for octetonium decaying to gamma gamma. The latter cross section
exceeds the Standard Model di-photon cross section when the COS mass is less
than 500 (350) GeV for sqrt{s} = 14 (7) TeV. Nonobservation of resonances below
these energies can significantly improve existing bounds on COS masses.
|
[
{
"created": "Tue, 6 Jul 2010 11:31:44 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Oct 2010 07:59:39 GMT",
"version": "v2"
}
] |
2010-11-09
|
[
[
"Idilbi",
"Ahmad",
""
],
[
"Kim",
"Chul",
""
],
[
"Mehen",
"Thomas",
""
]
] |
Heavy colored scalar particles, which exist in many models of new physics, can be pair produced at the Large Hadron Collider (LHC) via gluon-gluon fusion and possibly form quarkonium-like bound states. If the scalars are also charged under the electroweak gauge group, these bound states can then decay into electroweak bosons. This yields a resonant cross section for final states such as gamma gamma that can exceed Standard Model backgrounds. This paper studies this process in the Manohar-Wise model of color-octet scalars (COS). Important threshold logarithms and final state Coulomb-like QCD interactions are resummed using effective field theory. We compute the resummed cross section for gluon-gluon fusion to COS pairs at the LHC as well as the resonant cross section for octetonium decaying to gamma gamma. The latter cross section exceeds the Standard Model di-photon cross section when the COS mass is less than 500 (350) GeV for sqrt{s} = 14 (7) TeV. Nonobservation of resonances below these energies can significantly improve existing bounds on COS masses.
|
hep-ph/0608041
|
Deborah Nancy Aguilera
|
D.N. Aguilera
|
Spin-one color superconductivity in compact stars?- an analysis within
NJL-type models
|
7 pages, 7 figures, revised version, accepted for the Conference
Proceedings of "Isolated Neutron Stars: from the Interior to the Surface",
London, 24-28. April 2006
|
Astrophys.SpaceSci.308:443-450,2007
|
10.1007/s10509-007-9359-1
| null |
hep-ph astro-ph
| null |
We present results of a microscopic calculation using NJL-type model of
possible spin-one pairings in two flavor quark matter for applications in
compact star phenomenology. We focus on the color-spin locking phase (CSL) in
which all quarks pair in a symmetric way, in which color and spin states are
locked. The CSL condensate is particularly interesting for compact star
applications since it is flavor symmetric and could easily satisfy charge
neutrality. Moreover, the fact that in this phase all quarks are gapped might
help to suppress the direct Urca process, consistent with cooling models. The
order of magnitude of these small gaps (~1 MeV) will not influence the EoS, but
their also small critical temperatures (T_c ~800 keV) could be relevant in the
late stages neutron star evolution, when the temperature falls below this value
and a CSL quark core could form.
|
[
{
"created": "Thu, 3 Aug 2006 23:23:07 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Nov 2006 14:15:33 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Aguilera",
"D. N.",
""
]
] |
We present results of a microscopic calculation using NJL-type model of possible spin-one pairings in two flavor quark matter for applications in compact star phenomenology. We focus on the color-spin locking phase (CSL) in which all quarks pair in a symmetric way, in which color and spin states are locked. The CSL condensate is particularly interesting for compact star applications since it is flavor symmetric and could easily satisfy charge neutrality. Moreover, the fact that in this phase all quarks are gapped might help to suppress the direct Urca process, consistent with cooling models. The order of magnitude of these small gaps (~1 MeV) will not influence the EoS, but their also small critical temperatures (T_c ~800 keV) could be relevant in the late stages neutron star evolution, when the temperature falls below this value and a CSL quark core could form.
|
hep-ph/0305002
|
Jihn E. Kim
|
Kang-Sin Choi and Jihn E. Kim
|
Three family $Z_3$ orbifold trinification, MSSM and doublet-triplet
splitting problem
|
Latex file of 13 pages
|
Phys.Lett. B567 (2003) 87-92
|
10.1016/j.physletb.2003.06.036
| null |
hep-ph
| null |
A $Z_3$ orbifold compactification of $E_8\times E_8^\prime$ heterotic string
is considered toward a trinification $SU(3)^3$ with three light families. The
GUT scale VEV's of the $SU(2)_W\times U(1)_Y\times SU(3)_c$ singlet chiral
fields in two sets of the trinification spectrum allow an acceptable symmetry
breaking pattern toward MSSM. We show that a doublet-triplet splitting is
related to the absence of a $\Delta B$ nonzero operator.
|
[
{
"created": "Thu, 1 May 2003 00:01:21 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jun 2003 12:01:16 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Choi",
"Kang-Sin",
""
],
[
"Kim",
"Jihn E.",
""
]
] |
A $Z_3$ orbifold compactification of $E_8\times E_8^\prime$ heterotic string is considered toward a trinification $SU(3)^3$ with three light families. The GUT scale VEV's of the $SU(2)_W\times U(1)_Y\times SU(3)_c$ singlet chiral fields in two sets of the trinification spectrum allow an acceptable symmetry breaking pattern toward MSSM. We show that a doublet-triplet splitting is related to the absence of a $\Delta B$ nonzero operator.
|
hep-ph/9712251
|
Eckart Stein
|
L.Mankiewicz, G.Piller, E.Stein, M.V\"anttinen, T.Weigl
|
NLO Corrections to Deeply-Virtual Compton Scattering
|
8 pages, Latex. Error in polarised gluonic coefficient in Eq.(8)
corrected
|
Phys.Lett. B425 (1998) 186-192
|
10.1016/S0370-2693(98)00190-7
|
TUM/T39-97-31, DFTT 73/97
|
hep-ph
| null |
We have calculated the NLO corrections to the twist-2 part of the
deeply-virtual Compton scattering amplitude. Our results for the transverse and
antisymmetric parts agree with recent calculations by Ji and Osborne and by
Belitsky and M\"uller. In addition we present NLO results for the longitudinal
part of the amplitude.
|
[
{
"created": "Wed, 3 Dec 1997 15:44:26 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jul 1999 11:54:16 GMT",
"version": "v2"
},
{
"created": "Tue, 25 Jul 2000 15:04:09 GMT",
"version": "v3"
}
] |
2009-10-30
|
[
[
"Mankiewicz",
"L.",
""
],
[
"Piller",
"G.",
""
],
[
"Stein",
"E.",
""
],
[
"Vänttinen",
"M.",
""
],
[
"Weigl",
"T.",
""
]
] |
We have calculated the NLO corrections to the twist-2 part of the deeply-virtual Compton scattering amplitude. Our results for the transverse and antisymmetric parts agree with recent calculations by Ji and Osborne and by Belitsky and M\"uller. In addition we present NLO results for the longitudinal part of the amplitude.
|
1910.09209
|
Ying Li
|
Qi-Xin Li, Lei Yang, Zhi-Tian Zou, Ying Li, Xin Liu
|
Calculation of the $B\to K_{0,2}^*(1430)f_0(980)/\sigma$ decays in the
Perturbative QCD Approach
|
21 pages, 5 figures
| null |
10.1140/epjc/s10052-019-7484-y
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by the observations of the decays $B^0 \to K_0^{*}(1430)^0
f_0(980)$ and $ B^0 \to K_2^{*}(1430)^0 f_0(980)$ from BaBar collaboration, we
study the $B^{0(+)} \to K_{0,2}^{*}(1430)^{0(+)} f_0(980)/\sigma$ decays in the
perturbative QCD approach for the first time. In the absence of reliable
nonperturbative wave functions we only assume the scalar meson $f_0(980)$ and
$\sigma$ are two-quark ground states. In our calculations, these decays are all
dominated by the hard-scattering emission and annihilation diagrams, while the
factorizable emission diagrams are forbidden or suppressed heavily by the
vector decay constants. Furthermore, the branching fractions are sensitive to
the mixing between $f_0(980)$ and $\sigma$. Comparing our results with the
experimental data, a large mixing angle $\theta$ is favored. Taking
$\theta=145^\circ$, the orders of branching fractions of $B \to K_0^{*}(1430)^0
\sigma$, $B \to K_{2}^{*}(1430)^0 \sigma$ and $B \to K_{0,2}^{*}(1430)^0
f_0(980)$ are predicted to be $10^{-4}$, $10^{-5}$ and $10^{-6}$, respectively,
which can be measured in the current experiments such as LHCb and Belle-2. In
addition, although these decays are penguin dominant, the mixing also leads to
large direct $CP$ asymmetries in these decays. With the precise data in future,
our results could shed light on the inner structure of the scalar mesons and
can be used to determine the mixing angle of the $\sigma-f_0(980)$ system.
|
[
{
"created": "Mon, 21 Oct 2019 08:44:05 GMT",
"version": "v1"
}
] |
2020-01-08
|
[
[
"Li",
"Qi-Xin",
""
],
[
"Yang",
"Lei",
""
],
[
"Zou",
"Zhi-Tian",
""
],
[
"Li",
"Ying",
""
],
[
"Liu",
"Xin",
""
]
] |
Motivated by the observations of the decays $B^0 \to K_0^{*}(1430)^0 f_0(980)$ and $ B^0 \to K_2^{*}(1430)^0 f_0(980)$ from BaBar collaboration, we study the $B^{0(+)} \to K_{0,2}^{*}(1430)^{0(+)} f_0(980)/\sigma$ decays in the perturbative QCD approach for the first time. In the absence of reliable nonperturbative wave functions we only assume the scalar meson $f_0(980)$ and $\sigma$ are two-quark ground states. In our calculations, these decays are all dominated by the hard-scattering emission and annihilation diagrams, while the factorizable emission diagrams are forbidden or suppressed heavily by the vector decay constants. Furthermore, the branching fractions are sensitive to the mixing between $f_0(980)$ and $\sigma$. Comparing our results with the experimental data, a large mixing angle $\theta$ is favored. Taking $\theta=145^\circ$, the orders of branching fractions of $B \to K_0^{*}(1430)^0 \sigma$, $B \to K_{2}^{*}(1430)^0 \sigma$ and $B \to K_{0,2}^{*}(1430)^0 f_0(980)$ are predicted to be $10^{-4}$, $10^{-5}$ and $10^{-6}$, respectively, which can be measured in the current experiments such as LHCb and Belle-2. In addition, although these decays are penguin dominant, the mixing also leads to large direct $CP$ asymmetries in these decays. With the precise data in future, our results could shed light on the inner structure of the scalar mesons and can be used to determine the mixing angle of the $\sigma-f_0(980)$ system.
|
2102.00773
|
Kiran Ostrolenk Mr
|
Kiran Ostrolenk, Olivier Mattelaer
|
Speeding up MadGraph5_aMC@NLO
|
Submitted to European Physical Journal C
| null | null |
MCNET-21-01, CP3-21-01, MAN/HEP/2021/001
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we will describe two new optimisations implemented in
MadGraph5_aMC@NLO, both of which are designed to speed-up the computation of
leading-order processes (for any model). First we implement a new method to
evaluate the squared matrix element, dubbed helicity recycling, which results
in factor of two speed-up. Second, we have modified the multi-channel handling
of the phase-space integrator providing tremendous speed-up for VBF-like
processes (up to thousands times faster).
|
[
{
"created": "Mon, 1 Feb 2021 11:16:38 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Feb 2021 10:16:58 GMT",
"version": "v2"
},
{
"created": "Fri, 23 Apr 2021 11:18:50 GMT",
"version": "v3"
}
] |
2021-04-26
|
[
[
"Ostrolenk",
"Kiran",
""
],
[
"Mattelaer",
"Olivier",
""
]
] |
In this paper we will describe two new optimisations implemented in MadGraph5_aMC@NLO, both of which are designed to speed-up the computation of leading-order processes (for any model). First we implement a new method to evaluate the squared matrix element, dubbed helicity recycling, which results in factor of two speed-up. Second, we have modified the multi-channel handling of the phase-space integrator providing tremendous speed-up for VBF-like processes (up to thousands times faster).
|
hep-ph/0506042
|
Maxim Perelstein
|
Jay Hubisz, Patrick Meade, Andrew Noble, Maxim Perelstein
|
Electroweak Precision Constraints on the Littlest Higgs Model with T
Parity
|
23 pages, 9 figures. Minor corrections
|
JHEP 0601 (2006) 135
|
10.1088/1126-6708/2006/01/135
| null |
hep-ph
| null |
We compute the leading corrections to the properties of W and Z bosons
induced at the one-loop level in the SU(5)/SO(5) Littlest Higgs model with T
parity, and perform a global fit to precision electroweak data to determine the
constraints on the model parameters. We find that a large part of the model
parameter space is consistent with data. Values of the symmetry breaking scale
as low as 500 GeV are allowed, indicating that no significant fine tuning in
the Higgs potential is required. We identify a region within the allowed
parameter space in which the lightest T-odd particle, the partner of the
hypercharge gauge boson, has the correct relic abundance to play the role of
dark matter. In addition, we find that a consistent fit to data can be obtained
for large values of the Higgs mass, up to 800 GeV, due to the possibility of a
partial cancellation between the contributions to the T parameter from Higgs
loops and new physics.
|
[
{
"created": "Mon, 6 Jun 2005 18:36:12 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Sep 2005 21:28:47 GMT",
"version": "v2"
},
{
"created": "Thu, 26 Jan 2006 16:24:44 GMT",
"version": "v3"
}
] |
2009-11-11
|
[
[
"Hubisz",
"Jay",
""
],
[
"Meade",
"Patrick",
""
],
[
"Noble",
"Andrew",
""
],
[
"Perelstein",
"Maxim",
""
]
] |
We compute the leading corrections to the properties of W and Z bosons induced at the one-loop level in the SU(5)/SO(5) Littlest Higgs model with T parity, and perform a global fit to precision electroweak data to determine the constraints on the model parameters. We find that a large part of the model parameter space is consistent with data. Values of the symmetry breaking scale as low as 500 GeV are allowed, indicating that no significant fine tuning in the Higgs potential is required. We identify a region within the allowed parameter space in which the lightest T-odd particle, the partner of the hypercharge gauge boson, has the correct relic abundance to play the role of dark matter. In addition, we find that a consistent fit to data can be obtained for large values of the Higgs mass, up to 800 GeV, due to the possibility of a partial cancellation between the contributions to the T parameter from Higgs loops and new physics.
|
1810.04203
|
Siddhartha Karmakar
|
Sujata Pandey, Siddhartha Karmakar, Subhendu Rakshit
|
Interactions of Astrophysical Neutrinos with Dark Matter: A model
building perspective
|
Note added
| null |
10.1007/JHEP01(2019)095
| null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We explore the possibility that high energy astrophysical neutrinos can
interact with the dark matter on their way to Earth. Keeping in mind that new
physics might leave its signature at such energies, we have considered all
possible topologies for effective interactions between neutrino and dark
matter. Building models, that give rise to a significant flux suppression of
astrophysical neutrinos at Earth, is rather difficult. We present a
$Z^{\prime}$-mediated model in this context. Encompassing a large variety of
models, a wide range of dark matter masses from $10^{-21}$ eV up to a TeV, this
study aims at highlighting the challenges one encounters in such a model
building endeavour after satisfying various cosmological constraints, collider
search limits and electroweak precision measurements.
|
[
{
"created": "Tue, 9 Oct 2018 18:34:26 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Jan 2019 14:26:16 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Oct 2020 14:32:21 GMT",
"version": "v3"
}
] |
2020-10-22
|
[
[
"Pandey",
"Sujata",
""
],
[
"Karmakar",
"Siddhartha",
""
],
[
"Rakshit",
"Subhendu",
""
]
] |
We explore the possibility that high energy astrophysical neutrinos can interact with the dark matter on their way to Earth. Keeping in mind that new physics might leave its signature at such energies, we have considered all possible topologies for effective interactions between neutrino and dark matter. Building models, that give rise to a significant flux suppression of astrophysical neutrinos at Earth, is rather difficult. We present a $Z^{\prime}$-mediated model in this context. Encompassing a large variety of models, a wide range of dark matter masses from $10^{-21}$ eV up to a TeV, this study aims at highlighting the challenges one encounters in such a model building endeavour after satisfying various cosmological constraints, collider search limits and electroweak precision measurements.
|
1707.02806
|
Victor Goncalves
|
V. P. Goncalves, F. S. Navarra, D. Spiering
|
Probing Saturation Physics in the Real Compton Scattering at
Ultraperipheral $pPb$ Collisions
|
8 pages, 8 figures. Two new figures included. Version published in
Physics Letters B
| null |
10.1016/j.physletb.2017.09.071
| null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Real Compton Scattering in ultraperipheral $pPb$ collisions at RHIC and
LHC energies is investigated and predictions for the squared transverse
momentum ($t$) and rapidity ($Y$) distributions are presented. The scattering
amplitude is assumed to be given by the sum of the Reggeon and Pomeron
contributions and the Pomeron one is described by the Color Dipole formalism
taking into account the non - linear (saturation) effects in the QCD dynamics.
We demonstrate that the behaviour of the cross sections at large -- $t$ and/or
$Y$ is dominated by the Pomeron contribution and is strongly affected by the
non -- linear effects present in the QCD dynamics. These results indicate that
a future experimental analysis of this process can be useful to probe the QCD
dynamics at high energies.
|
[
{
"created": "Mon, 10 Jul 2017 11:39:01 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Oct 2017 10:03:14 GMT",
"version": "v2"
}
] |
2017-11-22
|
[
[
"Goncalves",
"V. P.",
""
],
[
"Navarra",
"F. S.",
""
],
[
"Spiering",
"D.",
""
]
] |
The Real Compton Scattering in ultraperipheral $pPb$ collisions at RHIC and LHC energies is investigated and predictions for the squared transverse momentum ($t$) and rapidity ($Y$) distributions are presented. The scattering amplitude is assumed to be given by the sum of the Reggeon and Pomeron contributions and the Pomeron one is described by the Color Dipole formalism taking into account the non - linear (saturation) effects in the QCD dynamics. We demonstrate that the behaviour of the cross sections at large -- $t$ and/or $Y$ is dominated by the Pomeron contribution and is strongly affected by the non -- linear effects present in the QCD dynamics. These results indicate that a future experimental analysis of this process can be useful to probe the QCD dynamics at high energies.
|
2203.03124
|
Hyerim Noh
|
Jai-chan Hwang, Hyerim Noh
|
Axion electrodynamics and magnetohydrodynamics
|
7 pages, no figure
| null |
10.1103/PhysRevD.106.023503
| null |
hep-ph astro-ph.CO gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We formulate axion-electrodynamics and magnetohydrodynamics (MHD) in the
cosmological context assuming weak gravity. The two formulations are made for a
general scalar field with general $f(\phi)$-coupling, and an axion as a massive
scalar field with $\phi^2$-coupling, with the helical electromagnetic field.
The $\alpha$-dynamo term appears naturally from the helical coupling in the MHD
formulation. In the presence of the electromagnetic coupling, however, the
Schr\"odinger and hydrodynamic formulations of the coherently oscillating axion
are {\it not} available for the conventional $\phi$ coupling; instead, $\phi^2$
coupling allows successful formulations preserving the dark matter nature of
the axion to nonlinear order. In the MHD formulation, direct couplings between
the scalar and electromagnetic fields appear only for non-ideal MHD. We study
gravitational and magnetic instabilities of the scalar field and axion MHDs.
|
[
{
"created": "Mon, 7 Mar 2022 04:24:03 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jul 2022 07:09:24 GMT",
"version": "v2"
}
] |
2022-07-20
|
[
[
"Hwang",
"Jai-chan",
""
],
[
"Noh",
"Hyerim",
""
]
] |
We formulate axion-electrodynamics and magnetohydrodynamics (MHD) in the cosmological context assuming weak gravity. The two formulations are made for a general scalar field with general $f(\phi)$-coupling, and an axion as a massive scalar field with $\phi^2$-coupling, with the helical electromagnetic field. The $\alpha$-dynamo term appears naturally from the helical coupling in the MHD formulation. In the presence of the electromagnetic coupling, however, the Schr\"odinger and hydrodynamic formulations of the coherently oscillating axion are {\it not} available for the conventional $\phi$ coupling; instead, $\phi^2$ coupling allows successful formulations preserving the dark matter nature of the axion to nonlinear order. In the MHD formulation, direct couplings between the scalar and electromagnetic fields appear only for non-ideal MHD. We study gravitational and magnetic instabilities of the scalar field and axion MHDs.
|
hep-ph/0102166
|
Osamu Yasuda
|
Osamu Yasuda
|
Neutrino Oscillations with Four Generations
|
13 pages, 4 sets of figures, uses sprocl, epsfig. Talk presented at
Joint U.S. / Japan Workshop On New Initiatives In Muon Lepton Flavor
Violation And Neutrino Oscillation With High Intense Muon And Neutrino
Sources, 2-6 Oct 2000, Honolulu, Hawaii, to appear in Proceedings published
by World Scientific Publishing Co
| null |
10.1142/9789812777003_0017
| null |
hep-ph
| null |
Recent status of neutrino oscillation phenomenology with four neutrinos is
reviewed. It is emphasized that the so-called (2+2)-scheme as well as the
(3+1)-scheme are still consistent with the recent solar and atmospheric
neutrino data.
|
[
{
"created": "Wed, 14 Feb 2001 12:00:36 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Yasuda",
"Osamu",
""
]
] |
Recent status of neutrino oscillation phenomenology with four neutrinos is reviewed. It is emphasized that the so-called (2+2)-scheme as well as the (3+1)-scheme are still consistent with the recent solar and atmospheric neutrino data.
|
0809.4951
|
Boris A. Arbuzov
|
Boris A. Arbuzov, Mikhail K. Volkov and Ivan V. Zaitsev
|
NJL interaction derived from QCD: vector and axial-vector mesons
|
19 pages, 2 figures, 1 table
|
Int.J.Mod.Phys.A24:2415-2430,2009
|
10.1142/S0217751X09043377
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In previous works effective non-local $SU(2)\times SU(2)$ NJL model was
derived in the framework of the fundamental QCD. All the parameters of the
model are expressed through QCD parameters: current light quark mass $m_0$ and
average non-perturbative $\alpha_s$. The results for scalar and pseudo-scalar
mesons are in satisfactory agreement to existing data. In the present work the
same model without introduction of any additional parameters is applied for a
description of masses and strong decay widths of $\rho$- and $a_1$-mesons. The
results for both scalar and vector sectors agree with data with only one
adjusted parameter $m_0$, with account of average $\alpha_s \simeq 0.415$,
which is obtained in a previous work as well.
|
[
{
"created": "Mon, 29 Sep 2008 12:20:57 GMT",
"version": "v1"
}
] |
2010-12-02
|
[
[
"Arbuzov",
"Boris A.",
""
],
[
"Volkov",
"Mikhail K.",
""
],
[
"Zaitsev",
"Ivan V.",
""
]
] |
In previous works effective non-local $SU(2)\times SU(2)$ NJL model was derived in the framework of the fundamental QCD. All the parameters of the model are expressed through QCD parameters: current light quark mass $m_0$ and average non-perturbative $\alpha_s$. The results for scalar and pseudo-scalar mesons are in satisfactory agreement to existing data. In the present work the same model without introduction of any additional parameters is applied for a description of masses and strong decay widths of $\rho$- and $a_1$-mesons. The results for both scalar and vector sectors agree with data with only one adjusted parameter $m_0$, with account of average $\alpha_s \simeq 0.415$, which is obtained in a previous work as well.
|
1004.5113
|
Alexander Kovner
|
Tolga Altinoluk, Alex Kovner and Eugene Levin
|
Inside looking out: probing JIMWLK with BFKL calculations
|
17 pages, 5 figures
|
Phys.Rev.D82:074016,2010
|
10.1103/PhysRevD.82.074016
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the relation between the eigenvalues and eigenfunctions of the
BFKL and JIMWLK/KLWMIJ Hamiltonians. We show that the eigenvalues of the BFKL
Hamiltonians are also {\it exact} eigenvalues of the KLWMIJ (and JIMWLK)
Hamiltonian, albeit corresponding to possibly non normalizable eigenfunctions.
The question whether a given eigenfunction of BFKL corresponds to a
normalizable eigenfunction of KLWMIJ is rather complicated, except in some
obvious cases, and requires independent investigation. As an example to
illustrate this relation we concentrate on the color octet exchange in the
framework of KLWMIJ Hamiltonian. We show that it corresponds to the reggeized
gluon exchange of BFKL, and find first correction to the BFKL wave function,
which has the meaning of the impact factor for shadowing correction to the
reggeized gluon. We also show that the bootstrap condition in the KLWMIJ
framework is satisfied automatically and does not carry any additional
information to that contained in the second quantized structure of the KLWMIJ
Hamiltonian. This is an example of how the bootstrap condition inherent in the
t-channel unitarity, arises in the s-channel picture.
|
[
{
"created": "Wed, 28 Apr 2010 19:35:43 GMT",
"version": "v1"
}
] |
2010-10-27
|
[
[
"Altinoluk",
"Tolga",
""
],
[
"Kovner",
"Alex",
""
],
[
"Levin",
"Eugene",
""
]
] |
We investigate the relation between the eigenvalues and eigenfunctions of the BFKL and JIMWLK/KLWMIJ Hamiltonians. We show that the eigenvalues of the BFKL Hamiltonians are also {\it exact} eigenvalues of the KLWMIJ (and JIMWLK) Hamiltonian, albeit corresponding to possibly non normalizable eigenfunctions. The question whether a given eigenfunction of BFKL corresponds to a normalizable eigenfunction of KLWMIJ is rather complicated, except in some obvious cases, and requires independent investigation. As an example to illustrate this relation we concentrate on the color octet exchange in the framework of KLWMIJ Hamiltonian. We show that it corresponds to the reggeized gluon exchange of BFKL, and find first correction to the BFKL wave function, which has the meaning of the impact factor for shadowing correction to the reggeized gluon. We also show that the bootstrap condition in the KLWMIJ framework is satisfied automatically and does not carry any additional information to that contained in the second quantized structure of the KLWMIJ Hamiltonian. This is an example of how the bootstrap condition inherent in the t-channel unitarity, arises in the s-channel picture.
|
2107.13845
|
Laurent Vanderheyden
|
Laurent Vanderheyden
|
Producing and constraining self-interacting hidden sector dark matter
|
260 pages, PhD thesis
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In this thesis, we start by reviewing all constraints applying on
self-interacting DM with a light mediator considering well-known Higgs portal
and Kinetic Mixing portal models as concrete examples. Then, we elaborate on
the Sommerfeld effect, and we study its many implications on self-interacting
DM models with light mediator. Next, we investigate how to account for the DM
relic abundance in such portal models which present a generic structure with
three populations (Standard Model, DM and mediator particles) connected to each
other through three interactions resulting from two coupling strengths. It
appears that this can be done through five different dynamical ways which give
rise to nine regimes among which four are new. Those new production regimes are
relevant for a situation where the hidden sector particles are not thermally
connected to the visible vector particles. We further study the possibility of
a thermally disconnected Hidden Sector and establish the general allowed
parameter space for DM thermal candidates in the hidden-to-visible temperature
ratio versus DM mass plane. We show that, in this framework, simple portal
models such as the two we consider can alleviate tensions at small scale while
offering suitable DM candidates. Other minimal self-interacting DM with light
mediator frameworks which consistently fulfil all constraints are also proposed
and explored.
|
[
{
"created": "Thu, 29 Jul 2021 09:26:29 GMT",
"version": "v1"
}
] |
2021-07-30
|
[
[
"Vanderheyden",
"Laurent",
""
]
] |
In this thesis, we start by reviewing all constraints applying on self-interacting DM with a light mediator considering well-known Higgs portal and Kinetic Mixing portal models as concrete examples. Then, we elaborate on the Sommerfeld effect, and we study its many implications on self-interacting DM models with light mediator. Next, we investigate how to account for the DM relic abundance in such portal models which present a generic structure with three populations (Standard Model, DM and mediator particles) connected to each other through three interactions resulting from two coupling strengths. It appears that this can be done through five different dynamical ways which give rise to nine regimes among which four are new. Those new production regimes are relevant for a situation where the hidden sector particles are not thermally connected to the visible vector particles. We further study the possibility of a thermally disconnected Hidden Sector and establish the general allowed parameter space for DM thermal candidates in the hidden-to-visible temperature ratio versus DM mass plane. We show that, in this framework, simple portal models such as the two we consider can alleviate tensions at small scale while offering suitable DM candidates. Other minimal self-interacting DM with light mediator frameworks which consistently fulfil all constraints are also proposed and explored.
|
hep-ph/0309292
|
Pelaez
|
J. R. Pelaez (U. Complutense, Madrid)
|
On the nature of light scalar mesons from their large $N_c$ behavior
|
4 pages. Slightly shortened version to appear in Phys. Rev. Lett. Two
typos corrected
|
Phys.Rev.Lett.92:102001,2004
|
10.1103/PhysRevLett.92.102001
| null |
hep-ph nucl-th
| null |
We show how to obtain information about the states of an effective field
theory in terms of the underlying fundamental theory. In particular we analyze
the spectroscopic nature of meson resonances from the meson-meson scattering
amplitudes of the QCD low energy effective theory, combined with the expansion
in the large number of colors. The vectors follow a qqbar behavior, whereas the
sigma, kappa and f_0(980) scalars disappear for large N_c, in support of a
qqqbarqbar-like nature. The a_0 shows a similar pattern, but the uncertainties
are large enough to accommodate both interpretations.
|
[
{
"created": "Thu, 25 Sep 2003 16:50:46 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Mar 2004 17:09:58 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Pelaez",
"J. R.",
"",
"U. Complutense, Madrid"
]
] |
We show how to obtain information about the states of an effective field theory in terms of the underlying fundamental theory. In particular we analyze the spectroscopic nature of meson resonances from the meson-meson scattering amplitudes of the QCD low energy effective theory, combined with the expansion in the large number of colors. The vectors follow a qqbar behavior, whereas the sigma, kappa and f_0(980) scalars disappear for large N_c, in support of a qqqbarqbar-like nature. The a_0 shows a similar pattern, but the uncertainties are large enough to accommodate both interpretations.
|
1812.08599
|
Yu Zhang
|
Pan Xue-An, Li Gang, Song Mao, Zhang Yu, Sun Hao, Guo Jian-You
|
Photoproduction of the double $J/\psi$ ($\Upsilon$) at the LHC with
forward proton tagging
|
11 pages, 7 figures, version as it appears in Phys.Rev.D
|
Phys. Rev. D 99, 014029(2019)
|
10.1103/PhysRevD.99.014029
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the photoproduction of double $J/\psi$ ($\Upsilon$) to leading
order based on the nonrelativistic quantum chromodynamics factorization
framework at the Large Hadron Collider with forward proton tagging. The
numerical results of double $J/\psi$ photoproduction pp $\rightarrow$
p$\gamma$p $\rightarrow$ $J/\psi$ + $J/\psi$ with different forward detector
acceptances ($\xi$) are presented. The total cross section of double $J/\psi$
photoproduction is less than 200 fb with 0.1 $<$ $\xi$ $<$ 0.5, but can reach
about 1.37(1.27) pb with 0.0015 $<$ $\xi$ $<$ 0.5 ( 0.0015 $<$ $\xi$ $<$ 0.15
). The double $J/\psi$ photoproduction may have the potential to be detected
and provide an interesting signature, thus is useful for studying the mechanism
of heavy quarkonium production. We also predict the double $\Upsilon$
photoproduction and find they are, unfortunately, small (with less than 10 fb).
|
[
{
"created": "Thu, 20 Dec 2018 14:29:26 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Jan 2019 09:52:16 GMT",
"version": "v2"
}
] |
2019-01-23
|
[
[
"Xue-An",
"Pan",
""
],
[
"Gang",
"Li",
""
],
[
"Mao",
"Song",
""
],
[
"Yu",
"Zhang",
""
],
[
"Hao",
"Sun",
""
],
[
"Jian-You",
"Guo",
""
]
] |
We calculate the photoproduction of double $J/\psi$ ($\Upsilon$) to leading order based on the nonrelativistic quantum chromodynamics factorization framework at the Large Hadron Collider with forward proton tagging. The numerical results of double $J/\psi$ photoproduction pp $\rightarrow$ p$\gamma$p $\rightarrow$ $J/\psi$ + $J/\psi$ with different forward detector acceptances ($\xi$) are presented. The total cross section of double $J/\psi$ photoproduction is less than 200 fb with 0.1 $<$ $\xi$ $<$ 0.5, but can reach about 1.37(1.27) pb with 0.0015 $<$ $\xi$ $<$ 0.5 ( 0.0015 $<$ $\xi$ $<$ 0.15 ). The double $J/\psi$ photoproduction may have the potential to be detected and provide an interesting signature, thus is useful for studying the mechanism of heavy quarkonium production. We also predict the double $\Upsilon$ photoproduction and find they are, unfortunately, small (with less than 10 fb).
|
2403.08560
|
G.R. Boroun
|
G.R.Boroun and Phuoc Ha
|
Decoupling of the structure functions in momentum space based on the
Laplace transformation
| null |
Physical Review D 109, 094037 (2024)
|
10.1103/PhysRevD.109.094037
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Using Laplace transform techniques, we describe the determination of the
longitudinal structure function $F_{L}(x,Q^2)$, at the leading-order
approximation in momentum space, from the structure function $F_{2}(x,Q^2)$ and
its derivative with respect to ${\ln}Q^2$ in a kinematical region of low values
of the Bjorken variable $x$. Since the $x$ dependence of $F_2(x,Q^2)$ and its
evolution with $Q^2$ are determined much better by the data than $F_L(x,Q^2)$,
this method provides both a direct check on $F_L(x,Q^2)$ where measured, and a
way of extending $F_L(x,Q^2)$ into regions of $x$ and $Q^2$ where there are
currently no data. In our calculations, we ultilize the Block-Durand-Ha
parametrization for the structure function $F_{2}(x,Q^2)$ [M. M. Block, L.
Durand and P. Ha, Phys.Rev.D {\bf89}, 094027 (2014)]. We find that the Laplace
transform method in momentum space provides correct behaviors of the extracted
longitudinal structure function $F_{L}(x,Q^2)$ and that our obtained results
are in line with data from the H1 Collaboration and other results for
$F_{L}(x,Q^2)$ obtained using Mellin transform method.
|
[
{
"created": "Wed, 13 Mar 2024 14:10:55 GMT",
"version": "v1"
},
{
"created": "Mon, 6 May 2024 04:55:49 GMT",
"version": "v2"
}
] |
2024-05-27
|
[
[
"Boroun",
"G. R.",
""
],
[
"Ha",
"Phuoc",
""
]
] |
Using Laplace transform techniques, we describe the determination of the longitudinal structure function $F_{L}(x,Q^2)$, at the leading-order approximation in momentum space, from the structure function $F_{2}(x,Q^2)$ and its derivative with respect to ${\ln}Q^2$ in a kinematical region of low values of the Bjorken variable $x$. Since the $x$ dependence of $F_2(x,Q^2)$ and its evolution with $Q^2$ are determined much better by the data than $F_L(x,Q^2)$, this method provides both a direct check on $F_L(x,Q^2)$ where measured, and a way of extending $F_L(x,Q^2)$ into regions of $x$ and $Q^2$ where there are currently no data. In our calculations, we ultilize the Block-Durand-Ha parametrization for the structure function $F_{2}(x,Q^2)$ [M. M. Block, L. Durand and P. Ha, Phys.Rev.D {\bf89}, 094027 (2014)]. We find that the Laplace transform method in momentum space provides correct behaviors of the extracted longitudinal structure function $F_{L}(x,Q^2)$ and that our obtained results are in line with data from the H1 Collaboration and other results for $F_{L}(x,Q^2)$ obtained using Mellin transform method.
|
hep-ph/0008179
|
Walter Grimus
|
W. Grimus, L. Lavoura
|
The seesaw mechanism at arbitrary order: disentangling the small scale
from the large scale
|
8 pages, Latex, no figures; paragraph added at the end of section 2,
one reference added
|
JHEP 0011 (2000) 042
|
10.1088/1126-6708/2000/11/042
|
UWThPh-2000-32
|
hep-ph
| null |
We develop a recipe which allows one to recursively and uniquely decouple the
large scale from the small scale in mass matrices of the seesaw type, up to any
order in the inverse of the large scale. Our method allows one to calculate the
mass matrix of the light neutrinos with arbitrary precision. The same method
can be applied in the case of quark mass matrices in an extension of the
Standard Model with vector-like quarks which have mass terms at a scale much
higher than the electroweak scale.
|
[
{
"created": "Thu, 17 Aug 2000 09:23:12 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Oct 2000 10:38:37 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Grimus",
"W.",
""
],
[
"Lavoura",
"L.",
""
]
] |
We develop a recipe which allows one to recursively and uniquely decouple the large scale from the small scale in mass matrices of the seesaw type, up to any order in the inverse of the large scale. Our method allows one to calculate the mass matrix of the light neutrinos with arbitrary precision. The same method can be applied in the case of quark mass matrices in an extension of the Standard Model with vector-like quarks which have mass terms at a scale much higher than the electroweak scale.
|
1102.0704
|
David Kaplan
|
David E. Kaplan, Matthew McEvoy
|
Associated Production of Non-Standard Higgs Bosons at the LHC
|
6 pages, 4 figures
|
Phys.Rev.D83:115004,2011
|
10.1103/PhysRevD.83.115004
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the feasibility of seeing a Higgs boson which decays to four
partons through a pair of (pseudo-)scalars at the LHC. We restrict our search
to Higgs bosons produced in association with a W/Z boson at high transverse
momentum. We argue that subjet analysis techniques are a good discriminant
between such events and W/Z plus jets and top-antitop production. For light
scalar masses (below 30 GeV), we find evidence that a flavor-independent search
for such a non-standard Higgs boson is plausible with 100 fb^-1 of data, while
a Higgs decaying to heavier scalars is only likely to be visible in models
where scalar decays to b quarks dominate.
|
[
{
"created": "Thu, 3 Feb 2011 15:30:03 GMT",
"version": "v1"
}
] |
2011-06-13
|
[
[
"Kaplan",
"David E.",
""
],
[
"McEvoy",
"Matthew",
""
]
] |
We discuss the feasibility of seeing a Higgs boson which decays to four partons through a pair of (pseudo-)scalars at the LHC. We restrict our search to Higgs bosons produced in association with a W/Z boson at high transverse momentum. We argue that subjet analysis techniques are a good discriminant between such events and W/Z plus jets and top-antitop production. For light scalar masses (below 30 GeV), we find evidence that a flavor-independent search for such a non-standard Higgs boson is plausible with 100 fb^-1 of data, while a Higgs decaying to heavier scalars is only likely to be visible in models where scalar decays to b quarks dominate.
|
2405.00446
|
Harleen Dahiya Dr.
|
Ritwik Acharyya, Satyajit Puhan and Harleen Dahiya
|
Quark spin-orbit correlations in spin-0 and spin-1 mesons using the
light-front quark model
|
23 pages, 4 figures and 3 tables
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We have investigated the spin-orbital angular momentum correlations for the
active quark inside the light and heavy mesons for both the spin-0 and spin-1
cases. These correlations can be derived from the generalised transverse
momentum dependent distributions (GTMDs) as well as the generalised parton
distributions (GPDs). We employ the overlap representation of light-front wave
functions in the light-front quark model (LFQM) to calculate our analytical
results. The dependence of spin-orbit correlations (SOCs) on the longitudinal
momentum fraction $x$ as well as the transverse momentum dependence
$\mathbf{k}_{\perp}$ has been graphically presented. Even though the SOCs have
already been studied for the spin-0 pions and kaons in other approaches, no
calculations for the other light and heavy spin-0 mesons have been reported in
literature. Further, the correlations for any of the light and heavy spin-1
mesons have been studied for the first time in the present work.
|
[
{
"created": "Wed, 1 May 2024 11:02:00 GMT",
"version": "v1"
}
] |
2024-05-02
|
[
[
"Acharyya",
"Ritwik",
""
],
[
"Puhan",
"Satyajit",
""
],
[
"Dahiya",
"Harleen",
""
]
] |
We have investigated the spin-orbital angular momentum correlations for the active quark inside the light and heavy mesons for both the spin-0 and spin-1 cases. These correlations can be derived from the generalised transverse momentum dependent distributions (GTMDs) as well as the generalised parton distributions (GPDs). We employ the overlap representation of light-front wave functions in the light-front quark model (LFQM) to calculate our analytical results. The dependence of spin-orbit correlations (SOCs) on the longitudinal momentum fraction $x$ as well as the transverse momentum dependence $\mathbf{k}_{\perp}$ has been graphically presented. Even though the SOCs have already been studied for the spin-0 pions and kaons in other approaches, no calculations for the other light and heavy spin-0 mesons have been reported in literature. Further, the correlations for any of the light and heavy spin-1 mesons have been studied for the first time in the present work.
|
1504.05915
|
Karol Kolodziej
|
Karol Kolodziej
|
CARLOMAT_3.0, an automatic tool for the electron-positron annihilation
into hadrons at low energies
|
15 pages, 5 figures, matches version to be published in Computer
Physics Communications
|
Comput.Phys.Commun. 196 (2015) 563-568
|
10.1016/j.cpc.2015.06.013
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A new version of CARLOMAT that allows to generate automatically the Monte
Carlo programs dedicated to the description of the processes e+e- -> hadrons at
low center-of-mass energies is presented. The program has been substantially
modified in order to incorporate the photon-vector meson mixing terms and to
make possible computation of the helicity amplitudes nvolving the Feynman
interaction vertices of new tensor structures, like those predicted by the
Resonance Chiral Theory or Hidden Local Symmetry model, and the effective
Lagrangian of the electromagnetic interaction of the nucleons. Moreover, a
number of new options have been introduced in the program in order to enable a
better control over the effective models implemented. In particular, they offer
a possibility to determine the dominant production mechanisms of the final
state chosen by the user.
|
[
{
"created": "Wed, 22 Apr 2015 18:33:25 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Jul 2015 11:05:48 GMT",
"version": "v2"
}
] |
2015-09-23
|
[
[
"Kolodziej",
"Karol",
""
]
] |
A new version of CARLOMAT that allows to generate automatically the Monte Carlo programs dedicated to the description of the processes e+e- -> hadrons at low center-of-mass energies is presented. The program has been substantially modified in order to incorporate the photon-vector meson mixing terms and to make possible computation of the helicity amplitudes nvolving the Feynman interaction vertices of new tensor structures, like those predicted by the Resonance Chiral Theory or Hidden Local Symmetry model, and the effective Lagrangian of the electromagnetic interaction of the nucleons. Moreover, a number of new options have been introduced in the program in order to enable a better control over the effective models implemented. In particular, they offer a possibility to determine the dominant production mechanisms of the final state chosen by the user.
|
hep-ph/9412211
|
O. W. Greenberg
|
S.R. Corley and O.W. Greenberg
|
Bound States in Galilean-Invariant Quantum Field Theory
|
17 pages, latex. Title, emphasis, and notation changed
| null | null |
University of Maryland PP 97-40
|
hep-ph nucl-th
| null |
We consider the nonrelativistic quantum mechanics of a model of two spinless
fermions interacting via a two-body potential. We introduce quantum fields
associated with the two particles as well as the expansion of these fields in
asymptotic ``in'' and ``out'' fields, including such fields for bound states,
in principle. We limit our explicit discussion to a two-body bound state. In
this context we discuss the implications of the Galilean invariance of the
model and, in particular, show how to include bound states in a strictly
Galilean-invariant quantum field theory.
|
[
{
"created": "Thu, 1 Dec 1994 21:11:07 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Nov 1996 19:08:45 GMT",
"version": "v2"
}
] |
2008-02-03
|
[
[
"Corley",
"S. R.",
""
],
[
"Greenberg",
"O. W.",
""
]
] |
We consider the nonrelativistic quantum mechanics of a model of two spinless fermions interacting via a two-body potential. We introduce quantum fields associated with the two particles as well as the expansion of these fields in asymptotic ``in'' and ``out'' fields, including such fields for bound states, in principle. We limit our explicit discussion to a two-body bound state. In this context we discuss the implications of the Galilean invariance of the model and, in particular, show how to include bound states in a strictly Galilean-invariant quantum field theory.
|
2301.07961
|
K\'aroly Seller
|
K\'aroly Seller, Zsolt Sz\'ep, Zolt\'an Tr\'ocsanyi
|
Real effective potentials for phase transitions in models with extended
scalar sectors
|
36 pages, 8 figures; references added, published version
| null |
10.1007/JHEP04(2023)096
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The effective potential obtained by loop expansion is usually not real in the
range of field values explored by its minima during a phase transition. We
apply the optimized perturbation theory in a fixed gauge to singlet scalar
extensions of the Standard Model in order to calculate a one-loop effective
potential that is real by construction. We test this computational scheme by
comparing such a potential obtained in Landau gauge to that derived based on
the Higgs pole mass. We carry out the latter construction by imposing physical
renormalization conditions, which yields a potential without residual
regularization scale dependence. We use our effective potential to study the
parameter dependence of the critical temperatures in a two-step phase
transition of the form $(0,0)\to (0,w')\to (v,w)$ that occurs for decreasing
temperature in scalar extensions of the SM with two vacuum expectation values
$v$ and $w$.
|
[
{
"created": "Thu, 19 Jan 2023 09:27:37 GMT",
"version": "v1"
},
{
"created": "Wed, 3 May 2023 13:12:53 GMT",
"version": "v2"
}
] |
2023-05-04
|
[
[
"Seller",
"Károly",
""
],
[
"Szép",
"Zsolt",
""
],
[
"Trócsanyi",
"Zoltán",
""
]
] |
The effective potential obtained by loop expansion is usually not real in the range of field values explored by its minima during a phase transition. We apply the optimized perturbation theory in a fixed gauge to singlet scalar extensions of the Standard Model in order to calculate a one-loop effective potential that is real by construction. We test this computational scheme by comparing such a potential obtained in Landau gauge to that derived based on the Higgs pole mass. We carry out the latter construction by imposing physical renormalization conditions, which yields a potential without residual regularization scale dependence. We use our effective potential to study the parameter dependence of the critical temperatures in a two-step phase transition of the form $(0,0)\to (0,w')\to (v,w)$ that occurs for decreasing temperature in scalar extensions of the SM with two vacuum expectation values $v$ and $w$.
|
hep-ph/0311247
|
Andrea Banfi
|
Andrea Banfi
|
Automated resummation of jet observables in QCD
|
4 pages, 1 figure. Talk presented at the XXXIII International
Symposium on Multiparticle Dynamics,September 5-11, 2003, Krakow, Poland
|
Acta Phys.Polon. B35 (2004) 411-416
| null |
NIKHEF-2003-015
|
hep-ph
| null |
We build a computer code that fully automates the resummation of
jet-observable distributions at next-to-leading logarithmic accuracy. As an
application we present results for a jet shape in hadronic dijet production.
|
[
{
"created": "Thu, 20 Nov 2003 08:20:32 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Banfi",
"Andrea",
""
]
] |
We build a computer code that fully automates the resummation of jet-observable distributions at next-to-leading logarithmic accuracy. As an application we present results for a jet shape in hadronic dijet production.
|
1708.00047
|
Robert Thorne S
|
R.S. Thorne, L.A. Harland-Lang and A.D. Martin
|
Inclusion of new LHC data in MMHT PDFs
|
6 pages. To appear in proceedings of DIS2017 Workshop
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I consider the effects of including a variety of new LHC data sets into the
MMHT approach for PDF determination. I consider the impact of fitting new LHC
and Tevatron data, which leads to clear improvements in some PDF uncertainties.
There are specific issues with ATLAS 7 TeV jet data and I include a discussion
of the treatment of correlated uncertainties and briefly the effects of NNLO
corrections. I also present preliminary results with the inclusion of the high
precison final ATLAS 7 TeV $W,Z$ rapidity-dependent data.
|
[
{
"created": "Mon, 31 Jul 2017 19:38:02 GMT",
"version": "v1"
}
] |
2017-08-02
|
[
[
"Thorne",
"R. S.",
""
],
[
"Harland-Lang",
"L. A.",
""
],
[
"Martin",
"A. D.",
""
]
] |
I consider the effects of including a variety of new LHC data sets into the MMHT approach for PDF determination. I consider the impact of fitting new LHC and Tevatron data, which leads to clear improvements in some PDF uncertainties. There are specific issues with ATLAS 7 TeV jet data and I include a discussion of the treatment of correlated uncertainties and briefly the effects of NNLO corrections. I also present preliminary results with the inclusion of the high precison final ATLAS 7 TeV $W,Z$ rapidity-dependent data.
|
2102.07248
|
Ismail Zahed
|
Yizhuang Liu and Ismail Zahed
|
Small size instanton contributions to the quark quasi-PDF and matching
kernel
|
24 pages, 2 figures
| null | null | null |
hep-ph hep-lat
|
http://creativecommons.org/licenses/by/4.0/
|
We investigate the non-perturbative contribution of instantons to current
matching kernels used in the context of the large momentum effective theory
(LaMET). We derive explicitly these contributions using first principle
semi-classical calculus for the unpolarized and polarized quark parton
distributions and the matching kernel, and show that they are part of a
trans-series expansion. These contributions are substantial at current lattice
matching momenta.
|
[
{
"created": "Sun, 14 Feb 2021 21:15:32 GMT",
"version": "v1"
}
] |
2021-02-16
|
[
[
"Liu",
"Yizhuang",
""
],
[
"Zahed",
"Ismail",
""
]
] |
We investigate the non-perturbative contribution of instantons to current matching kernels used in the context of the large momentum effective theory (LaMET). We derive explicitly these contributions using first principle semi-classical calculus for the unpolarized and polarized quark parton distributions and the matching kernel, and show that they are part of a trans-series expansion. These contributions are substantial at current lattice matching momenta.
|
1801.04877
|
Guido Bell
|
Guido Bell, Rudi Rahn, Jim Talbert
|
Automated Calculation of Dijet Soft Functions in the Presence of Jet
Clustering Effects
|
7 pages, 3 figures; to appear in the proceedings of the 13th
International Symposium on Radiative Corrections (Radcor 2017), 24-29
September 2017, St. Gilgen, Austria
| null | null |
SI-HEP-2018-01, QFET-2018-03, DESY 17-238
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We extend our framework for the automated calculation of dijet soft functions
to observables that do not obey the non-Abelian exponentiation theorem, like
jet-veto or grooming soft functions that are sensitive to clustering effects of
the jet algorithm. Although the matrix element for uncorrelated double
emissions has a simpler structure than the one for correlated emissions, we
argue that its singularity structure poses more stringent constraints on the
required phase-space parametrisation. Our algorithm applies to both SCET-1 and
SCET-2 soft functions and it is implemented in the novel program SoftSERVE. We
present results for various jet-veto observables and obtain new predictions for
the soft-drop jet-grooming algorithm.
|
[
{
"created": "Mon, 15 Jan 2018 17:06:20 GMT",
"version": "v1"
}
] |
2018-01-16
|
[
[
"Bell",
"Guido",
""
],
[
"Rahn",
"Rudi",
""
],
[
"Talbert",
"Jim",
""
]
] |
We extend our framework for the automated calculation of dijet soft functions to observables that do not obey the non-Abelian exponentiation theorem, like jet-veto or grooming soft functions that are sensitive to clustering effects of the jet algorithm. Although the matrix element for uncorrelated double emissions has a simpler structure than the one for correlated emissions, we argue that its singularity structure poses more stringent constraints on the required phase-space parametrisation. Our algorithm applies to both SCET-1 and SCET-2 soft functions and it is implemented in the novel program SoftSERVE. We present results for various jet-veto observables and obtain new predictions for the soft-drop jet-grooming algorithm.
|
hep-ph/0211260
|
Alexander Dolgov
|
A.D. Dolgov
|
Cosmological Matter-Antimatter Asymmetry and Antimatter in the Universe
|
Keynote lecture at XIVth Rencontres de Blois 2002 on
Matter-Antimatter Asymmetry, Blois, France, June, 2002, to be published in
the proceedings, ed. J. Tran Thanh Van; latex, 13 pages
| null | null | null |
hep-ph astro-ph
| null |
Models of baryogenesis which may lead to astronomically significant amount of
antimatter in the universe are reviewed. Observational features are briefly
discussed.
|
[
{
"created": "Sun, 17 Nov 2002 10:14:47 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Dolgov",
"A. D.",
""
]
] |
Models of baryogenesis which may lead to astronomically significant amount of antimatter in the universe are reviewed. Observational features are briefly discussed.
|
2109.14782
|
Hiroyuki Kitamoto
|
Hiroyuki Kitamoto, Masaki Yamada
|
Semiclassical analysis of axion-assisted and axion-driven pair
production
|
22 pages, 2 figures, matches published version
|
JHEP 06 (2022) 103
|
10.1007/JHEP06(2022)103
|
YITP-21-81, TU-1132
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the pair production of fermions in a time dependent axion background
with and without an electric background. We construct the adiabatic mode
functions which incorporate the gauge field and the axion velocity dependence
of the dispersion relation. The semiclassical approach using this adiabatic
basis shows two types of pair production. One is axion-assisted pair
production: the presence of the axion velocity gives enhancement and
interference effects on the pair production driven by the electric field. The
other is axion-driven pair production: the time variation of the axion velocity
causes the pair production even though the electric field is absent.
|
[
{
"created": "Thu, 30 Sep 2021 01:12:17 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Oct 2021 03:30:53 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Jun 2022 16:29:01 GMT",
"version": "v3"
}
] |
2022-07-01
|
[
[
"Kitamoto",
"Hiroyuki",
""
],
[
"Yamada",
"Masaki",
""
]
] |
We study the pair production of fermions in a time dependent axion background with and without an electric background. We construct the adiabatic mode functions which incorporate the gauge field and the axion velocity dependence of the dispersion relation. The semiclassical approach using this adiabatic basis shows two types of pair production. One is axion-assisted pair production: the presence of the axion velocity gives enhancement and interference effects on the pair production driven by the electric field. The other is axion-driven pair production: the time variation of the axion velocity causes the pair production even though the electric field is absent.
|
hep-ph/9401211
|
Edmond Iancu
|
Jean-Paul Blaizot and Edmond Iancu
|
Energy-Momentum Tensors for the Quark-Gluon Plasma
|
28 pages LaTex, Saclay preprint T94/03
|
Nucl.Phys.B421:565-592,1994
|
10.1016/0550-3213(94)90517-7
| null |
hep-ph
| null |
We construct the energy-momentum tensor for the gauge fields which describe
the collective excitations of the quark-gluon plasma. We rely on the
description of the collective modes that we have derived in previous works. By
using the conservation laws for energy and momentum, we obtain three different
versions for the tensor $T^{\mu\nu}$, which are physically equivalent. We show
that the total energy constructed from $T^{00}$ is positive for any non-trivial
field configuration. Finally, we present a new non-abelian solution of the
equations of motion for the gauge fields. This solution corresponds to
spatially uniform color oscillations of the plasma.
|
[
{
"created": "Wed, 5 Jan 1994 16:47:13 GMT",
"version": "v1"
}
] |
2011-07-19
|
[
[
"Blaizot",
"Jean-Paul",
""
],
[
"Iancu",
"Edmond",
""
]
] |
We construct the energy-momentum tensor for the gauge fields which describe the collective excitations of the quark-gluon plasma. We rely on the description of the collective modes that we have derived in previous works. By using the conservation laws for energy and momentum, we obtain three different versions for the tensor $T^{\mu\nu}$, which are physically equivalent. We show that the total energy constructed from $T^{00}$ is positive for any non-trivial field configuration. Finally, we present a new non-abelian solution of the equations of motion for the gauge fields. This solution corresponds to spatially uniform color oscillations of the plasma.
|
2008.13337
|
Alexander Bondar
|
A.E. Bondar, A.I. Milstein
|
Charge asymmetry in decays $ B\rightarrow D\bar DK$
|
11 pages, 7 figures, version submitted to JHEP
|
J. High Energ. Phys. 12, 15 (2020)
|
10.1007/JHEP12(2020)015
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discusses the charge asymmetry in $ B\rightarrow D\bar DK$ decays with an
invariant mass of the $D\bar D$ pair near the $\Psi(3770)$ resonance. Unlike $
\Psi (3770) $ decays in $ e^+e^- $ annihilation, in $B^+$ decays the
probability of $D^0\bar D^0$ production is almost three times higher than $D^+
D^-$. In $B^0$ decays, the ratio of these probabilities will be opposite. The
effect is explained by the fact that, in $B$ -meson decays, the $D\bar D$ pair
is produced in a superposition of isoscalar and isovector states, and only in
combination with $K$ -mesons the total state has $ 1/2 $ isospin. We present a
simple model in which the interference of the nonresonant isovector amplitude
with the resonant isoscalar amplitude explains the experimental data.
|
[
{
"created": "Mon, 31 Aug 2020 03:26:12 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Sep 2020 15:21:15 GMT",
"version": "v2"
}
] |
2020-12-14
|
[
[
"Bondar",
"A. E.",
""
],
[
"Milstein",
"A. I.",
""
]
] |
We discusses the charge asymmetry in $ B\rightarrow D\bar DK$ decays with an invariant mass of the $D\bar D$ pair near the $\Psi(3770)$ resonance. Unlike $ \Psi (3770) $ decays in $ e^+e^- $ annihilation, in $B^+$ decays the probability of $D^0\bar D^0$ production is almost three times higher than $D^+ D^-$. In $B^0$ decays, the ratio of these probabilities will be opposite. The effect is explained by the fact that, in $B$ -meson decays, the $D\bar D$ pair is produced in a superposition of isoscalar and isovector states, and only in combination with $K$ -mesons the total state has $ 1/2 $ isospin. We present a simple model in which the interference of the nonresonant isovector amplitude with the resonant isoscalar amplitude explains the experimental data.
|
2203.15679
|
Philip L\"ughausen
|
Thorsten Feldmann, Philip L\"ughausen, Danny van Dyk
|
Systematic Parametrization of the Leading $B$-meson Light-Cone
Distribution Amplitude
|
34 pages, 8 figures, 1 table
| null |
10.1007/JHEP10(2022)162
|
SI-HEP-2022-05, P3H-22-029, TUM-HEP-1388/22
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a parametrization of the leading $B$-meson light-cone distribution
amplitude (LCDA) in heavy-quark effective theory (HQET). In position space, it
uses a conformal transformation that yields a systematic Taylor expansion and
an integral bound, which enables control of the truncation error. Our
parametrization further produces compact analytical expressions for a variety
of derived quantities. At a given reference scale, our momentum-space
parametrization corresponds to an expansion in associated Laguerre polynomials,
which turn into confluent hypergeometric functions ${}_1F_1$ under
renormalization-group evolution at one-loop accuracy. Our approach thus allows
a straightforward and transparent implementation of a variety of
phenomenological constraints, regardless of their origin. Moreover, we can
include theoretical information on the Taylor coefficients by using the local
operator production expansion. We showcase the versatility of the
parametrization in a series of phenomenological pseudo-fits.
|
[
{
"created": "Tue, 29 Mar 2022 15:37:38 GMT",
"version": "v1"
}
] |
2022-11-09
|
[
[
"Feldmann",
"Thorsten",
""
],
[
"Lüghausen",
"Philip",
""
],
[
"van Dyk",
"Danny",
""
]
] |
We propose a parametrization of the leading $B$-meson light-cone distribution amplitude (LCDA) in heavy-quark effective theory (HQET). In position space, it uses a conformal transformation that yields a systematic Taylor expansion and an integral bound, which enables control of the truncation error. Our parametrization further produces compact analytical expressions for a variety of derived quantities. At a given reference scale, our momentum-space parametrization corresponds to an expansion in associated Laguerre polynomials, which turn into confluent hypergeometric functions ${}_1F_1$ under renormalization-group evolution at one-loop accuracy. Our approach thus allows a straightforward and transparent implementation of a variety of phenomenological constraints, regardless of their origin. Moreover, we can include theoretical information on the Taylor coefficients by using the local operator production expansion. We showcase the versatility of the parametrization in a series of phenomenological pseudo-fits.
|
1409.3199
|
Sudhir Vempati
|
Alessandro Broggio, Eung Jin Chun, Massimo Passera, Ketan M. Patel and
Sudhir K. Vempati
|
Limiting two-Higgs-doublet models
|
18 pages, 3 figures
| null |
10.1007/JHEP11(2014)058
| null |
hep-ph
|
http://creativecommons.org/licenses/publicdomain/
|
We update the constraints on two-Higgs-doublet models (2HDMs) focusing on the
parameter space relevant to explain the present muon $g$$-$$2$ anomaly, $\Delta
a_{\mu}$, in four different types of models, type I, II, "lepton specific" (or
X) and "flipped" (or Y). We show that the strong constraints provided by the
electroweak precision data on the mass of the pseudoscalar Higgs, whose
contribution may account for $\Delta a_{\mu}$, are evaded in regions where the
charged scalar is degenerate with the heavy neutral one and the mixing angles
$\alpha$ and $\beta$ satisfy the Standard Model limit $\beta-\alpha \approx \pi
/2$. We combine theoretical constraints from vacuum stability and
perturbativity with direct and indirect bounds arising from collider and
$B$~physics. Possible future constraints from the electron $g$$-$$2$ are also
considered. If the 126 GeV resonance discovered at the LHC is interpreted as
the light CP-even Higgs boson of the 2HDM, we find that only models of type X
can satisfy all the considered theoretical and experimental constraints.
|
[
{
"created": "Wed, 10 Sep 2014 19:20:35 GMT",
"version": "v1"
}
] |
2015-06-22
|
[
[
"Broggio",
"Alessandro",
""
],
[
"Chun",
"Eung Jin",
""
],
[
"Passera",
"Massimo",
""
],
[
"Patel",
"Ketan M.",
""
],
[
"Vempati",
"Sudhir K.",
""
]
] |
We update the constraints on two-Higgs-doublet models (2HDMs) focusing on the parameter space relevant to explain the present muon $g$$-$$2$ anomaly, $\Delta a_{\mu}$, in four different types of models, type I, II, "lepton specific" (or X) and "flipped" (or Y). We show that the strong constraints provided by the electroweak precision data on the mass of the pseudoscalar Higgs, whose contribution may account for $\Delta a_{\mu}$, are evaded in regions where the charged scalar is degenerate with the heavy neutral one and the mixing angles $\alpha$ and $\beta$ satisfy the Standard Model limit $\beta-\alpha \approx \pi /2$. We combine theoretical constraints from vacuum stability and perturbativity with direct and indirect bounds arising from collider and $B$~physics. Possible future constraints from the electron $g$$-$$2$ are also considered. If the 126 GeV resonance discovered at the LHC is interpreted as the light CP-even Higgs boson of the 2HDM, we find that only models of type X can satisfy all the considered theoretical and experimental constraints.
|
0803.1786
|
Matthias Jamin
|
Matthias Jamin, Antonio Pich, Jorge Portoles
|
What can be learned from the Belle spectrum for the decay tau- -> nu_tau
K_S pi-
|
15 pages, 2 figures
|
Phys.Lett.B664:78-83,2008
|
10.1016/j.physletb.2008.04.049
|
UAB-FT-642, IFIC/08-16, FTUV/08-0312
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A theoretical description of the differential decay spectrum for the decay
tau- -> nu_tau K_S pi-, which is based on the contributing K pi vector and
scalar form factors F_+^{K pi}(s) and F_0^{K pi}(s) being calculated in the
framework of resonance chiral theory (R$\chi$T), additionally imposing
constraints from dispersion relations as well as short distance QCD, provides a
good representation of a recent measurement of the spectrum by the Belle
collaboration. Our fit allows to deduce the total branching fraction B[tau- ->
nu_tau K_S pi-] = 0.427 +- 0.024 % by integrating the spectrum, as well as the
K^* resonance parameters M_{K^*} = 895.3 +- 0.2 MeV and Gamma_{K^*} = 47.5 +-
0.4 MeV, where the last two errors are statistical only. From our fits, we
confirm that the scalar form factor F_0^{K pi}(s) is required to provide a good
description, but we were unable to further constrain this contribution.
Finally, from our results for the vector form factor F_+^{K pi}(s), we update
the corresponding slope and curvature parameters lambda'_+ = (25.2 +-
0.3)*10^{-3} and lambda''_+ = (12.9 +- 0.3)*10^{-4}, respectively.
|
[
{
"created": "Wed, 12 Mar 2008 14:47:31 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Jamin",
"Matthias",
""
],
[
"Pich",
"Antonio",
""
],
[
"Portoles",
"Jorge",
""
]
] |
A theoretical description of the differential decay spectrum for the decay tau- -> nu_tau K_S pi-, which is based on the contributing K pi vector and scalar form factors F_+^{K pi}(s) and F_0^{K pi}(s) being calculated in the framework of resonance chiral theory (R$\chi$T), additionally imposing constraints from dispersion relations as well as short distance QCD, provides a good representation of a recent measurement of the spectrum by the Belle collaboration. Our fit allows to deduce the total branching fraction B[tau- -> nu_tau K_S pi-] = 0.427 +- 0.024 % by integrating the spectrum, as well as the K^* resonance parameters M_{K^*} = 895.3 +- 0.2 MeV and Gamma_{K^*} = 47.5 +- 0.4 MeV, where the last two errors are statistical only. From our fits, we confirm that the scalar form factor F_0^{K pi}(s) is required to provide a good description, but we were unable to further constrain this contribution. Finally, from our results for the vector form factor F_+^{K pi}(s), we update the corresponding slope and curvature parameters lambda'_+ = (25.2 +- 0.3)*10^{-3} and lambda''_+ = (12.9 +- 0.3)*10^{-4}, respectively.
|
2006.05737
|
Vladimir Skalozub
|
Vladimir Skalozub
|
$A_0$ condensation, Nielsen's identity and effective potential of order
parameter
|
10 pages
|
Phys.Part.Nucl.Letters,2021, V.18, No 7, 738 - 745
|
10.1134/S1547477121070116
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In high temperature SU(2) gluodynamics, the condensation of the zero
component gauge field potential A_0 =const and its gauge-fixing dependence are
investigated. A_0 is mutually related with Polyakov's loop <L>. The two-loop
effective potential W(A_0,xi) is recalculated in the background relativistic
R_xi gauge. It depends on the parameter xi, has a nontrivial minimum and
satisfies Nielsen's identity. These signs mean gauge invariance of the
condensation phenomenon.
Following the idea of Belyaev, we express W(A_0,xi) in terms of <L>. The
obtained effective potential of order parameter differs from that derived by
this author. It is independent of xi and has a nontrivial minimum position.
Hence the A_0 condensation follows. We show that the equation relating A_0 and
(A_0)|_(classical) coincides with the special characteristic orbit in the
(A)$-plain along which the W(A_0,xi) is xi-independent. In this way the link
between these two gauge invariant descriptions is established. The minimum
value of the Polyakov loop is calculated. Comparison with results of other
authors is given.
|
[
{
"created": "Wed, 10 Jun 2020 09:03:51 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Aug 2020 08:52:00 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Feb 2021 10:32:01 GMT",
"version": "v3"
},
{
"created": "Wed, 7 Apr 2021 14:24:34 GMT",
"version": "v4"
}
] |
2022-02-02
|
[
[
"Skalozub",
"Vladimir",
""
]
] |
In high temperature SU(2) gluodynamics, the condensation of the zero component gauge field potential A_0 =const and its gauge-fixing dependence are investigated. A_0 is mutually related with Polyakov's loop <L>. The two-loop effective potential W(A_0,xi) is recalculated in the background relativistic R_xi gauge. It depends on the parameter xi, has a nontrivial minimum and satisfies Nielsen's identity. These signs mean gauge invariance of the condensation phenomenon. Following the idea of Belyaev, we express W(A_0,xi) in terms of <L>. The obtained effective potential of order parameter differs from that derived by this author. It is independent of xi and has a nontrivial minimum position. Hence the A_0 condensation follows. We show that the equation relating A_0 and (A_0)|_(classical) coincides with the special characteristic orbit in the (A)$-plain along which the W(A_0,xi) is xi-independent. In this way the link between these two gauge invariant descriptions is established. The minimum value of the Polyakov loop is calculated. Comparison with results of other authors is given.
|
1811.04932
|
Samuel D McDermott
|
Samuel D. McDermott, Michael S. Turner
|
Nuclear Kinetic Equilibrium During Big Bang Nucleosynthesis
|
10 pages, extended comparison to Sasankan et al
| null | null |
FERMILAB-PUB-18-625-A
|
hep-ph astro-ph.CO astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Sasankan et al, have recently claimed that there are significant deviations
in the phase-space distributions of the kinetic energies of nuclei from the
Maxwell-Boltzmann form usually assumed in BBN, and further, that these
deviations lead to big changes in the predicted light-element abundances.
Solving the relativistic Boltzmann equation perturbatively, we explicitly show
that these deviations are not 20% as claimed, but rather are about 10^-17 in
size and hence cannot significantly alter the predicted light-element
abundances. We discuss and compute two related effects: O(0.1%) corrections to
the kinetic distributions of nuclei that arise from small relativistic
corrections to the MB distribution and a much smaller effect, nuclear kinetic
drag, which arises from the heat transferred from the EM plasma to nuclei that
is needed to maintain kinetic equilibrium.
|
[
{
"created": "Mon, 12 Nov 2018 19:00:01 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Nov 2018 15:58:37 GMT",
"version": "v2"
}
] |
2018-11-22
|
[
[
"McDermott",
"Samuel D.",
""
],
[
"Turner",
"Michael S.",
""
]
] |
Sasankan et al, have recently claimed that there are significant deviations in the phase-space distributions of the kinetic energies of nuclei from the Maxwell-Boltzmann form usually assumed in BBN, and further, that these deviations lead to big changes in the predicted light-element abundances. Solving the relativistic Boltzmann equation perturbatively, we explicitly show that these deviations are not 20% as claimed, but rather are about 10^-17 in size and hence cannot significantly alter the predicted light-element abundances. We discuss and compute two related effects: O(0.1%) corrections to the kinetic distributions of nuclei that arise from small relativistic corrections to the MB distribution and a much smaller effect, nuclear kinetic drag, which arises from the heat transferred from the EM plasma to nuclei that is needed to maintain kinetic equilibrium.
|
hep-ph/9407362
|
Sharon Jensen
|
Stanley J. Brodsky, SLAC, and Peter M. Zerwas, DESY
|
High Energy Photon-Photon Collisions -
|
uses PHYZZX, 52 pages, 30 figures (available upon request),
SLAC-PUB-6571
|
Nucl.Instrum.Meth.A355:19-41,1995
|
10.1016/0168-9002(94)01174-5
| null |
hep-ph
| null |
The collisions of high energy photons produced at an electron-positron
collider provide a comprehensive laboratory for testing QCD, electroweak
interactions, and extensions of the Standard Model. The luminosity and energy
of the colliding photons produced by back-scattering laser beams is expected to
be comparable to that of the primary $e^+e^-$ collisions. In this overview, we
shall focus on tests of electroweak theory in photon-photon annihilation,
particularly $\gamma\gamma \rightarrow W^+ W^-$, $\gamma\gamma \rightarrow $
Higgs bosons, and higher-order loop processes, such as $\gamma\gamma
\rightarrow \gamma\gamma, Z \gamma$ and $ZZ.$ Since each photon can be resolved
into a $W^+ W^-$ pair, high energy photon-photon collisions can also provide a
remarkably background-free laboratory for studying $WW$ collisions and
annihilation. We also review high energy $\gamma\gamma$ tests of quantum
chromodynamics, such as the scaling of the photon structure function, $t \bar
t$ production, mini-jet processes, and diffractive reactions.
|
[
{
"created": "Fri, 22 Jul 1994 19:18:00 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Brodsky",
"Stanley J.",
""
],
[
"SLAC",
"",
""
],
[
"Zerwas",
"Peter M.",
""
],
[
"DESY",
"",
""
]
] |
The collisions of high energy photons produced at an electron-positron collider provide a comprehensive laboratory for testing QCD, electroweak interactions, and extensions of the Standard Model. The luminosity and energy of the colliding photons produced by back-scattering laser beams is expected to be comparable to that of the primary $e^+e^-$ collisions. In this overview, we shall focus on tests of electroweak theory in photon-photon annihilation, particularly $\gamma\gamma \rightarrow W^+ W^-$, $\gamma\gamma \rightarrow $ Higgs bosons, and higher-order loop processes, such as $\gamma\gamma \rightarrow \gamma\gamma, Z \gamma$ and $ZZ.$ Since each photon can be resolved into a $W^+ W^-$ pair, high energy photon-photon collisions can also provide a remarkably background-free laboratory for studying $WW$ collisions and annihilation. We also review high energy $\gamma\gamma$ tests of quantum chromodynamics, such as the scaling of the photon structure function, $t \bar t$ production, mini-jet processes, and diffractive reactions.
|
1307.3454
|
Karol Kovarik
|
K. Kovarik, T. Jezo, A. Kusina, F. I. Olness, I. Schienbein, T.
Stavreva, J. Y. Yu
|
CTEQ nuclear parton distribution functions
|
5 pages, to appear in the proceedings of XXI International Workshop
on Deep-Inelastic Scattering and Related Subjects, Marseilles, France
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show for the first time preliminary results of nuclear parton distribution
function analysis of charged lepton DIS and Drell-Yan data within the CTEQ
framework including error PDFs. We compare our error estimates to estimates of
different nPDF groups.
|
[
{
"created": "Fri, 12 Jul 2013 13:32:29 GMT",
"version": "v1"
}
] |
2013-07-15
|
[
[
"Kovarik",
"K.",
""
],
[
"Jezo",
"T.",
""
],
[
"Kusina",
"A.",
""
],
[
"Olness",
"F. I.",
""
],
[
"Schienbein",
"I.",
""
],
[
"Stavreva",
"T.",
""
],
[
"Yu",
"J. Y.",
""
]
] |
We show for the first time preliminary results of nuclear parton distribution function analysis of charged lepton DIS and Drell-Yan data within the CTEQ framework including error PDFs. We compare our error estimates to estimates of different nPDF groups.
|
1705.09841
|
Wei-Jie Fu
|
Wei-jie Fu and Yu-xin Liu
|
Four-fermion interactions and the chiral symmetry breaking in an
external magnetic field
|
8 pages, 4 figures
|
Phys. Rev. D 96, 074019 (2017)
|
10.1103/PhysRevD.96.074019
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the chiral symmetry and its spontaneous breaking at finite
temperature and in an external magnetic field with four-fermion interactions of
different channels. Quantum and thermal fluctuations are included within the
functional renormalization group approach, and properties of the set of flow
equations for different couplings, such as its fixed points, are discussed. It
is found that external parameters, e.g. the temperature and the external
magnetic field and so on, do not change the structure of the renormalization
group flows for the couplings. The flow strength is found to be significantly
dependent on the route and direction in the plane of couplings of different
channels. Therefore, the critical temperature for the chiral phase transition
shows a pronounced dependence on the direction as well. Given fixed initial
ultraviolet couplings, the critical temperature increases with the increasing
magnetic field, viz., the magnetic catalysis is observed with initial couplings
fixed.
|
[
{
"created": "Sat, 27 May 2017 16:43:45 GMT",
"version": "v1"
}
] |
2017-10-25
|
[
[
"Fu",
"Wei-jie",
""
],
[
"Liu",
"Yu-xin",
""
]
] |
We investigate the chiral symmetry and its spontaneous breaking at finite temperature and in an external magnetic field with four-fermion interactions of different channels. Quantum and thermal fluctuations are included within the functional renormalization group approach, and properties of the set of flow equations for different couplings, such as its fixed points, are discussed. It is found that external parameters, e.g. the temperature and the external magnetic field and so on, do not change the structure of the renormalization group flows for the couplings. The flow strength is found to be significantly dependent on the route and direction in the plane of couplings of different channels. Therefore, the critical temperature for the chiral phase transition shows a pronounced dependence on the direction as well. Given fixed initial ultraviolet couplings, the critical temperature increases with the increasing magnetic field, viz., the magnetic catalysis is observed with initial couplings fixed.
|
2304.04575
|
Shao-zhou Jiang
|
Hao Liu, Yuan-He Zou, Yan-Rui Liu, Shao-Zhou Jiang
|
Chiral Lagrangians for spin-$\frac{1}{2}$ and spin-$\frac{3}{2}$ doubly
charmed baryons
|
28 pages
|
Phys. Rev. D 108, 014032 (2023)
|
10.1103/PhysRevD.108.014032
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The relativistic chiral Lagrangians for both spin-$\frac{1}{2}$ and
spin-$\frac{3}{2}$ doubly charmed baryons are constructed up to the order
$\mathcal{O}(p^{4})$. From $\mathcal{O}(p^{2})$ to $\mathcal{O}(p^{4})$, there
are 19, 74, and 452 independent terms in the two-flavor case and 25, 112, and
864 independent terms in the three-flavor case. The chiral Lagrangians in the
heavy diquark limit are also obtained. From $\mathcal{O}(p^{2})$ to
$\mathcal{O}(p^{4})$, there are 7, 23, and 118 independent terms in the
two-flavor case and 8, 31, and 189 independent terms in the three-flavor case.
We present the low-energy constant relations between the relativistic case and
the case in the heavy diquark limit up to the order $\mathcal{O}(p^{3})$. With
the heavy diquark-antiquark symmetry, the low-energy constant relations between
the doubly charmed baryon case and the heavy-light meson case are also obtained
up to the order $\mathcal{O}(p^{3})$.
|
[
{
"created": "Fri, 7 Apr 2023 04:53:09 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jul 2023 02:15:38 GMT",
"version": "v2"
}
] |
2023-08-02
|
[
[
"Liu",
"Hao",
""
],
[
"Zou",
"Yuan-He",
""
],
[
"Liu",
"Yan-Rui",
""
],
[
"Jiang",
"Shao-Zhou",
""
]
] |
The relativistic chiral Lagrangians for both spin-$\frac{1}{2}$ and spin-$\frac{3}{2}$ doubly charmed baryons are constructed up to the order $\mathcal{O}(p^{4})$. From $\mathcal{O}(p^{2})$ to $\mathcal{O}(p^{4})$, there are 19, 74, and 452 independent terms in the two-flavor case and 25, 112, and 864 independent terms in the three-flavor case. The chiral Lagrangians in the heavy diquark limit are also obtained. From $\mathcal{O}(p^{2})$ to $\mathcal{O}(p^{4})$, there are 7, 23, and 118 independent terms in the two-flavor case and 8, 31, and 189 independent terms in the three-flavor case. We present the low-energy constant relations between the relativistic case and the case in the heavy diquark limit up to the order $\mathcal{O}(p^{3})$. With the heavy diquark-antiquark symmetry, the low-energy constant relations between the doubly charmed baryon case and the heavy-light meson case are also obtained up to the order $\mathcal{O}(p^{3})$.
|
0711.3950
|
Masaki Asano
|
Masaki Asano, Shigeki Matsumoto, Masato Senami, Hiroaki Sugiyama
|
Neutralino Dark Matter in Light Higgs Boson Scenario
|
11 pages, 4 figures; references and 1 figure added, version to appear
in Phys. Lett. B
|
Phys.Lett.B663:330-333,2008
|
10.1016/j.physletb.2008.04.042
|
KEK-TH-1204, TU-785, SISSA 86/2007/EP
|
hep-ph
| null |
Phenomenology of neutralino dark matter in the minimal supersymmetric model
is discussed for a scenario where the lightest Higgs boson mass is lighter than
114.4 GeV. We show that the scenario is consistent not only with many collider
experiments but also with the observed relic abundance of dark matter. The
allowed region may be probed by experiments of Bs to mu^+ mu^- in near future.
The scenario predicts a large scattering cross section between the dark matter
and ordinary matter and thus it may be tested in present direct detection
experiments of dark matter.
|
[
{
"created": "Mon, 26 Nov 2007 14:17:35 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Apr 2008 05:16:05 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Asano",
"Masaki",
""
],
[
"Matsumoto",
"Shigeki",
""
],
[
"Senami",
"Masato",
""
],
[
"Sugiyama",
"Hiroaki",
""
]
] |
Phenomenology of neutralino dark matter in the minimal supersymmetric model is discussed for a scenario where the lightest Higgs boson mass is lighter than 114.4 GeV. We show that the scenario is consistent not only with many collider experiments but also with the observed relic abundance of dark matter. The allowed region may be probed by experiments of Bs to mu^+ mu^- in near future. The scenario predicts a large scattering cross section between the dark matter and ordinary matter and thus it may be tested in present direct detection experiments of dark matter.
|
hep-ph/0409171
|
Michio Hashimoto
|
Michio Hashimoto, Masaharu Tanabashi, Koichi Yamawaki
|
Top mode standard model and extra dimensions
|
4 pages, Talk given by M.H. at the 12th International Conference on
Supersymmetry and Unification of Fundamental Interactions (SUSY 2004), June
17-23, 2004, Tsukuba, Japan
| null | null | null |
hep-ph
| null |
We perform the most attractive channel (MAC) analysis in the top mode
standard model with TeV-scale extra dimensions, where the standard model gauge
bosons and the third generation of quarks and leptons are put in D(=6,8,...)
dimensions. In order to make the scenario viable, only the attractive force of
the top condensate should exceed the critical coupling, while other channels
such as the bottom and tau condensates should not. It turns out that the top
condensate can be the MAC for D=8, whereas the tau condensation is favored for
D=6. On the basis of the renormalization group equations for the top Yukawa and
Higgs quartic couplings, we predict masses of the top quark and the Higgs boson
for D=8 as m_t=172-175 GeV and m_H=176-188 GeV, respectively.
|
[
{
"created": "Wed, 15 Sep 2004 05:18:24 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Hashimoto",
"Michio",
""
],
[
"Tanabashi",
"Masaharu",
""
],
[
"Yamawaki",
"Koichi",
""
]
] |
We perform the most attractive channel (MAC) analysis in the top mode standard model with TeV-scale extra dimensions, where the standard model gauge bosons and the third generation of quarks and leptons are put in D(=6,8,...) dimensions. In order to make the scenario viable, only the attractive force of the top condensate should exceed the critical coupling, while other channels such as the bottom and tau condensates should not. It turns out that the top condensate can be the MAC for D=8, whereas the tau condensation is favored for D=6. On the basis of the renormalization group equations for the top Yukawa and Higgs quartic couplings, we predict masses of the top quark and the Higgs boson for D=8 as m_t=172-175 GeV and m_H=176-188 GeV, respectively.
|
hep-ph/0108265
|
Michael Lublinsky
|
E. Levin and M. Lublinsky
|
Non-linear evolution and high energy diffractive production
|
8 pages, 3 figures
|
Phys.Lett. B521 (2001) 233-238
|
10.1016/S0370-2693(01)01217-5
|
DESY-01-124, TAUP - 2689 - 2001
|
hep-ph
| null |
The ratio of the diffractive production to the total cross section in DIS is
computed as a function of the produced mass. The analysis is based on the
solution to the non-linear evolution equation for the diffraction dissociation
in DIS.
The obtained ratios almost do not depend on the central mass energy in
agreement with the HERA experimental data. This independence is argued to be a
consequence of the scaling phenomena displayed by the cross sections.
As a weakness point a significant discrepancy between the data and the
obtained results is found in the absolute values of the ratios. Several
explanatory reasons are discussed.
|
[
{
"created": "Fri, 31 Aug 2001 09:25:22 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Levin",
"E.",
""
],
[
"Lublinsky",
"M.",
""
]
] |
The ratio of the diffractive production to the total cross section in DIS is computed as a function of the produced mass. The analysis is based on the solution to the non-linear evolution equation for the diffraction dissociation in DIS. The obtained ratios almost do not depend on the central mass energy in agreement with the HERA experimental data. This independence is argued to be a consequence of the scaling phenomena displayed by the cross sections. As a weakness point a significant discrepancy between the data and the obtained results is found in the absolute values of the ratios. Several explanatory reasons are discussed.
|
1510.00938
|
George Rupp
|
Susana Coito, George Rupp, and Eef van Beveren
|
Unquenched quark-model calculation of excited $\rho$ resonances and
P-wave $\pi\pi$ phase shifts
|
Plain LaTeX, 6 pages, 1 table, talk given by G. Rupp at the
Mini-Workshop Bled 2015, "Exploring Hadron Resonances", Bled, Slovenia, 5-11
July 2015
|
Bled Workshops in Physics Vol. 16 No. 1 (2015) pp. 30-35
| null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The $\rho(770)$ vector resonance, its radial recurrences, and the
corresponding P-wave $\pi\pi$ phase shifts are investigated in an unquenched
quark model with all classes of relevant decay channels included, viz.
pseudoscalar-pseudoscalar, vector-pseudoscalar, vector-vector, vector-scalar,
axialvector-pseudoscalar, and axialvector-vector, totalling 26 channels. Two of
the few model parameters are fixed at previously used values, whereas the other
three are adjusted to the $\rho(770)$ resonance and the lower P-wave $\pi\pi$
phases. Preliminary results indicate the model's capacity to reproduce these
phases as well as the $\rho$ mass and width. However, at higher energies the
phase shifts tend to rise too sharply. A possible remedy is an extension of the
model so as to handle resonances in the final states for most of the included
decay channels. Work in progress.
|
[
{
"created": "Sun, 4 Oct 2015 13:56:36 GMT",
"version": "v1"
}
] |
2015-12-09
|
[
[
"Coito",
"Susana",
""
],
[
"Rupp",
"George",
""
],
[
"van Beveren",
"Eef",
""
]
] |
The $\rho(770)$ vector resonance, its radial recurrences, and the corresponding P-wave $\pi\pi$ phase shifts are investigated in an unquenched quark model with all classes of relevant decay channels included, viz. pseudoscalar-pseudoscalar, vector-pseudoscalar, vector-vector, vector-scalar, axialvector-pseudoscalar, and axialvector-vector, totalling 26 channels. Two of the few model parameters are fixed at previously used values, whereas the other three are adjusted to the $\rho(770)$ resonance and the lower P-wave $\pi\pi$ phases. Preliminary results indicate the model's capacity to reproduce these phases as well as the $\rho$ mass and width. However, at higher energies the phase shifts tend to rise too sharply. A possible remedy is an extension of the model so as to handle resonances in the final states for most of the included decay channels. Work in progress.
|
hep-ph/0605091
|
Fuminobu Takahashi
|
Motoi Endo, Koichi Hamaguchi, Fuminobu Takahashi
|
Moduli/Inflaton Mixing with Supersymmetry Breaking Field
|
29 pages, no figure. v2: with several corrections, to appear in PRD
|
Phys.Rev. D74 (2006) 023531
|
10.1103/PhysRevD.74.023531
|
DESY 06-035
|
hep-ph astro-ph hep-th
| null |
A heavy scalar field such as moduli or an inflaton generally mixes with a
field responsible for the supersymmetry breaking. We study the scalar decay
into the standard model particles and their superpartners, gravitinos, and the
supersymmetry breaking sector, particularly paying attention to decay modes
that proceed via the mixing between the scalar and the supersymmetry breaking
field. The impacts of the new decay processes on cosmological scenarios are
also discussed; the modulus field generically produces too much gravitinos, and
most of the inflation models tend to result in too high reheating temperature
and/or gravitino overproduction.
|
[
{
"created": "Tue, 9 May 2006 16:09:55 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Jul 2006 16:12:25 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Endo",
"Motoi",
""
],
[
"Hamaguchi",
"Koichi",
""
],
[
"Takahashi",
"Fuminobu",
""
]
] |
A heavy scalar field such as moduli or an inflaton generally mixes with a field responsible for the supersymmetry breaking. We study the scalar decay into the standard model particles and their superpartners, gravitinos, and the supersymmetry breaking sector, particularly paying attention to decay modes that proceed via the mixing between the scalar and the supersymmetry breaking field. The impacts of the new decay processes on cosmological scenarios are also discussed; the modulus field generically produces too much gravitinos, and most of the inflation models tend to result in too high reheating temperature and/or gravitino overproduction.
|
0704.3707
|
Drago Alessandro
|
Luca Bonanno (Dip.Fisica Univ.Ferrara and INFN sez Ferrara),
Alessandro Drago (Dip.Fisica Univ.Ferrara and INFN sez Ferrara), Andrea
Lavagno (Politecnico di Torino and INFN sez. Torino)
|
Softening of the equation of state of matter at large densities and
temperatures: chiral symmetry restoration vs. quark deconfinement
|
4 pages, 4 figures, editorially accepted version
|
Phys.Rev.Lett.99:242301,2007; PoS CPOD07:061,2007
|
10.1103/PhysRevLett.99.242301
| null |
hep-ph nucl-th
| null |
We discuss two models for describing the behavior of matter at large
densities and intermediate temperatures. In both models a softening of the
equation of state takes place due to the appearance of new degrees of freedom.
The first is a hadronic model in which the softening is due to chiral symmetry
restoration. In the second model the softening is associated with the formation
of clusters of quarks in the mixed phase. We show that both models allow a
significant softening but, in the first case the bulk modulus is mainly
dependent on the density, while in the mixed phase model it also strongly
depends on the temperature. We also show that the bulk modulus is not vanishing
in the mixed phase due to the presence of two conserved charges, the baryon and
the isospin one. Only in a small region of densities and temperatures the
incompressibility becomes extremely small. Finally we compare our results with
recent analysis of heavy ion collisions at intermediate energies.
|
[
{
"created": "Fri, 27 Apr 2007 17:12:04 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Dec 2007 18:50:05 GMT",
"version": "v2"
}
] |
2009-04-21
|
[
[
"Bonanno",
"Luca",
"",
"Dip.Fisica Univ.Ferrara and INFN sez Ferrara"
],
[
"Drago",
"Alessandro",
"",
"Dip.Fisica Univ.Ferrara and INFN sez Ferrara"
],
[
"Lavagno",
"Andrea",
"",
"Politecnico di Torino and INFN sez. Torino"
]
] |
We discuss two models for describing the behavior of matter at large densities and intermediate temperatures. In both models a softening of the equation of state takes place due to the appearance of new degrees of freedom. The first is a hadronic model in which the softening is due to chiral symmetry restoration. In the second model the softening is associated with the formation of clusters of quarks in the mixed phase. We show that both models allow a significant softening but, in the first case the bulk modulus is mainly dependent on the density, while in the mixed phase model it also strongly depends on the temperature. We also show that the bulk modulus is not vanishing in the mixed phase due to the presence of two conserved charges, the baryon and the isospin one. Only in a small region of densities and temperatures the incompressibility becomes extremely small. Finally we compare our results with recent analysis of heavy ion collisions at intermediate energies.
|
hep-ph/0205086
|
Tsuneo Uematsu
|
Hideshi Baba, Ken Sasaki and Tsuneo Uematsu
|
Twist-3 Effects in Polarized Photon Structure
|
4 pages, LaTeX2e, 2 eps figures, ws-ijmpa.cls file included, Talk
given at the 3rd Circum-Pan-Pacific Symposium on High Energy Spin Physics,
Beijing, October 8-13, 2001, to appear in the Proceedings
|
Int.J.Mod.Phys. A18 (2003) 1425-1428
|
10.1142/S0217751X03014824
|
KUCP-204, YNU-HEPTh-02-104
|
hep-ph
| null |
The polarized photon structure is described by two spin structure functions
$g_1^\gamma$ and $g_2^\gamma$ which can be studied in the future polarized ep
or e$^+$e$^-$ colliders. Here we investigate the QCD twist-3 effects in
$g_2^\gamma$ to the leading order in QCD.
|
[
{
"created": "Thu, 9 May 2002 10:09:31 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Baba",
"Hideshi",
""
],
[
"Sasaki",
"Ken",
""
],
[
"Uematsu",
"Tsuneo",
""
]
] |
The polarized photon structure is described by two spin structure functions $g_1^\gamma$ and $g_2^\gamma$ which can be studied in the future polarized ep or e$^+$e$^-$ colliders. Here we investigate the QCD twist-3 effects in $g_2^\gamma$ to the leading order in QCD.
|
hep-ph/0501166
|
Isabella Masina
|
I. Masina, C.A. Savoy
|
On Power and Complementarity of the Experimental Constraints on Seesaw
Models
|
28 pages, 5 figures; v2: a comment a reference added, minor
improvements in the text
|
Phys.Rev. D71 (2005) 093003
|
10.1103/PhysRevD.71.093003
|
ROMA1-TH/1397-04, SACLAY-T05/08
|
hep-ph
| null |
We demonstrate the impact that present lepton flavour and CP violation data -
neutrino oscillations, baryon asymmetry of the universe, flavour violations in
charged lepton decays and lepton electric dipole moments - have on
supersymmetric seesaw theories by analysing the class of models based on a U(1)
flavour symmetry. The fermion U(1) charges are determined to a large extent by
the data, the flavour patterns being naturally defined through their choice.
The selected models generically predict mu -> e gamma within the reach of the
projected experiments, which could be sensitive enough to exclude the whole
class of them. By now, the present sensitivity to mu -> e gamma already
provides stringent bounds on the contribution of the seesaw couplings to the
lepton electric dipole moments.
|
[
{
"created": "Tue, 18 Jan 2005 15:45:20 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Feb 2005 14:59:13 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Masina",
"I.",
""
],
[
"Savoy",
"C. A.",
""
]
] |
We demonstrate the impact that present lepton flavour and CP violation data - neutrino oscillations, baryon asymmetry of the universe, flavour violations in charged lepton decays and lepton electric dipole moments - have on supersymmetric seesaw theories by analysing the class of models based on a U(1) flavour symmetry. The fermion U(1) charges are determined to a large extent by the data, the flavour patterns being naturally defined through their choice. The selected models generically predict mu -> e gamma within the reach of the projected experiments, which could be sensitive enough to exclude the whole class of them. By now, the present sensitivity to mu -> e gamma already provides stringent bounds on the contribution of the seesaw couplings to the lepton electric dipole moments.
|
2304.13056
|
Matteo Piani
|
Matteo Piani, Javier Rubio
|
Preheating in Einstein-Cartan Higgs Inflation: Oscillon formation
|
Matches the published version
| null |
10.1088/1475-7516/2023/12/002
|
IPARCOS-UCM-23-031
|
hep-ph astro-ph.CO gr-qc
|
http://creativecommons.org/licenses/by/4.0/
|
We make use of classical lattice simulations in 3 + 1 dimensions to study the
preheating stage of Higgs Inflation in Einstein-Cartan gravity. Focusing for
concreteness on a simplified scenario involving the seminal Nieh-Yan term, we
demonstrate the formation of dense and spatially localized oscillon
configurations constituting up to 70% of the total energy density. The
emergence of these meta-stable objects may lead to a prolonged period of matter
domination, effectively modifying the post-inflationary history of the Universe
as compared to the metric and Palatini counterparts. Notably, the creation of
oscillons comes together with a significant gravitational wave signal, whose
typical frequency lies, however, beyond the range accessible by existing and
planned gravitational wave experiments. The impact of the Standard Model gauge
bosons and fermions and the potential extension of our results to more general
Einstein-Cartan settings is also discussed.
|
[
{
"created": "Tue, 25 Apr 2023 18:00:03 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Feb 2024 17:45:08 GMT",
"version": "v2"
}
] |
2024-02-02
|
[
[
"Piani",
"Matteo",
""
],
[
"Rubio",
"Javier",
""
]
] |
We make use of classical lattice simulations in 3 + 1 dimensions to study the preheating stage of Higgs Inflation in Einstein-Cartan gravity. Focusing for concreteness on a simplified scenario involving the seminal Nieh-Yan term, we demonstrate the formation of dense and spatially localized oscillon configurations constituting up to 70% of the total energy density. The emergence of these meta-stable objects may lead to a prolonged period of matter domination, effectively modifying the post-inflationary history of the Universe as compared to the metric and Palatini counterparts. Notably, the creation of oscillons comes together with a significant gravitational wave signal, whose typical frequency lies, however, beyond the range accessible by existing and planned gravitational wave experiments. The impact of the Standard Model gauge bosons and fermions and the potential extension of our results to more general Einstein-Cartan settings is also discussed.
|
2309.02633
|
Maura E. Ramirez-Quezada
|
Motoko Fujiwara and Koichi Hamaguchi and Natsumi Nagata and Maura E.
Ramirez-Quezada
|
Vortex Creep Heating vs. Dark Matter Heating in Neutron Stars
|
8 pages, 2 figures
| null | null | null |
hep-ph astro-ph.HE
|
http://creativecommons.org/licenses/by/4.0/
|
Dark matter particles captured in neutron stars deposit their energy as heat.
This DM heating effect can be observed only if it dominates over other internal
heating effects in NSs. In this work, as an example of such an internal heating
source, we consider the frictional heating caused by the creep motion of
neutron superfluid vortex lines in the NS crust. The luminosity of this heating
effect is controlled by the strength of the interaction between the vortex
lines and nuclei in the crust, which can be estimated from the many-body
calculation of a high-density nuclear system as well as through the temperature
observation of old NSs. We show that both the temperature observation and
theoretical calculation suggest that the vortex creep heating dominates over
the DM heating. The vortex-nuclei interaction must be smaller than the
estimated values by several orders of magnitude to overturn this.
|
[
{
"created": "Wed, 6 Sep 2023 00:48:30 GMT",
"version": "v1"
}
] |
2023-09-07
|
[
[
"Fujiwara",
"Motoko",
""
],
[
"Hamaguchi",
"Koichi",
""
],
[
"Nagata",
"Natsumi",
""
],
[
"Ramirez-Quezada",
"Maura E.",
""
]
] |
Dark matter particles captured in neutron stars deposit their energy as heat. This DM heating effect can be observed only if it dominates over other internal heating effects in NSs. In this work, as an example of such an internal heating source, we consider the frictional heating caused by the creep motion of neutron superfluid vortex lines in the NS crust. The luminosity of this heating effect is controlled by the strength of the interaction between the vortex lines and nuclei in the crust, which can be estimated from the many-body calculation of a high-density nuclear system as well as through the temperature observation of old NSs. We show that both the temperature observation and theoretical calculation suggest that the vortex creep heating dominates over the DM heating. The vortex-nuclei interaction must be smaller than the estimated values by several orders of magnitude to overturn this.
|
hep-ph/0211357
|
Abdelhak Djouadi
|
Abdelhak Djouadi
|
SUSY Calculation Tools
|
12 pages, 2 figures. Plenary talk given at SUSY2002 DESY Hamburg,
17-23 June 2002
| null | null |
PM-02-42
|
hep-ph
| null |
I discuss the various available tools for the study of the properties of the
new particles predicted in the Minimal Supersymmetric extension of the Standard
Model. Emphasis will be put on the codes for the determination of the sparticle
and Higgs boson spectrum. Codes for the calculation of production cross
sections, decay widths and branching ratios, Dark Matter relic density and
detection rates, as well as codes for automatic analytical calculations and
Monte-Carlo event generators for Supersymmetric processes will be briefly
discussed.
|
[
{
"created": "Fri, 22 Nov 2002 15:35:02 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Djouadi",
"Abdelhak",
""
]
] |
I discuss the various available tools for the study of the properties of the new particles predicted in the Minimal Supersymmetric extension of the Standard Model. Emphasis will be put on the codes for the determination of the sparticle and Higgs boson spectrum. Codes for the calculation of production cross sections, decay widths and branching ratios, Dark Matter relic density and detection rates, as well as codes for automatic analytical calculations and Monte-Carlo event generators for Supersymmetric processes will be briefly discussed.
|
1502.04224
|
Bradley James Kavanagh
|
Bradley J. Kavanagh
|
Discretising the velocity distribution for directional dark matter
experiments
|
36 pages, 11 figures. Matches version accepted in JCAP. Python code
for Radon transform calculation available from the author
|
JCAP 07 (2015) 019
|
10.1088/1475-7516/2015/07/019
|
SACLAY-t15/016
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Dark matter (DM) direct detection experiments which are
directionally-sensitive may be the only method of probing the full velocity
distribution function (VDF) of the Galactic DM halo. We present an angular
basis for the DM VDF which can be used to parametrise the distribution in order
to mitigate astrophysical uncertainties in future directional experiments and
extract information about the DM halo. This basis consists of discretising the
VDF in a series of angular bins, with the VDF being only a function of the DM
speed $v$ within each bin. In contrast to other methods, such as spherical
harmonic expansions, the use of this basis allows us to guarantee that the
resulting VDF is everywhere positive and therefore physical. We present a
recipe for calculating the event rates corresponding to the discrete VDF for an
arbitrary number of angular bins $N$ and investigate the discretisation error
which is introduced in this way. For smooth, Standard Halo Model-like
distribution functions, only $N=3$ angular bins are required to achieve an
accuracy of around $10-30\%$ in the number of events in each bin. Shortly after
confirmation of the DM origin of the signal with around 50 events, this
accuracy should be sufficient to allow the discretised velocity distribution to
be employed reliably. For more extreme VDFs (such as streams), the
discretisation error is typically much larger, but can be improved with
increasing $N$. This method paves the way towards an astrophysics-independent
analysis framework for the directional detection of dark matter.
|
[
{
"created": "Sat, 14 Feb 2015 16:52:32 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Jun 2015 13:14:29 GMT",
"version": "v2"
}
] |
2015-07-14
|
[
[
"Kavanagh",
"Bradley J.",
""
]
] |
Dark matter (DM) direct detection experiments which are directionally-sensitive may be the only method of probing the full velocity distribution function (VDF) of the Galactic DM halo. We present an angular basis for the DM VDF which can be used to parametrise the distribution in order to mitigate astrophysical uncertainties in future directional experiments and extract information about the DM halo. This basis consists of discretising the VDF in a series of angular bins, with the VDF being only a function of the DM speed $v$ within each bin. In contrast to other methods, such as spherical harmonic expansions, the use of this basis allows us to guarantee that the resulting VDF is everywhere positive and therefore physical. We present a recipe for calculating the event rates corresponding to the discrete VDF for an arbitrary number of angular bins $N$ and investigate the discretisation error which is introduced in this way. For smooth, Standard Halo Model-like distribution functions, only $N=3$ angular bins are required to achieve an accuracy of around $10-30\%$ in the number of events in each bin. Shortly after confirmation of the DM origin of the signal with around 50 events, this accuracy should be sufficient to allow the discretised velocity distribution to be employed reliably. For more extreme VDFs (such as streams), the discretisation error is typically much larger, but can be improved with increasing $N$. This method paves the way towards an astrophysics-independent analysis framework for the directional detection of dark matter.
|
hep-ph/0610016
|
Wolfgang Lucha
|
Wolfgang Lucha and F. F. Schoberl
|
Generalized Instantaneous Bethe-Salpeter Equation and Exact Quark
Propagators
|
to appear in the Proceedings of the International Conference on
"Quark Confinement and the Hadron Spectrum VII," September 2-7, 2006, Ponta
Delgada, Azores, Portugal
|
AIPConf.Proc.892:524-524,2007
|
10.1063/1.2714463
| null |
hep-ph hep-lat nucl-th
| null |
A three-dimensional reduction of the homogeneous Bethe-Salpeter equation
retaining, in contrast to the Salpeter equation, the exact propagators (crucial
for, e.g., a proper incorporation of dynamical chiral symmetry breakdown) is
proposed. This formalism may be easily extended to Bethe-Salpeter equations for
bound states composed of particles that are not, or not all, identical to
spin-1/2 fermions as well as to three-dimensional reductions of the
Bethe-Salpeter equation different from Salpeter's equation.
|
[
{
"created": "Mon, 2 Oct 2006 09:56:41 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Lucha",
"Wolfgang",
""
],
[
"Schoberl",
"F. F.",
""
]
] |
A three-dimensional reduction of the homogeneous Bethe-Salpeter equation retaining, in contrast to the Salpeter equation, the exact propagators (crucial for, e.g., a proper incorporation of dynamical chiral symmetry breakdown) is proposed. This formalism may be easily extended to Bethe-Salpeter equations for bound states composed of particles that are not, or not all, identical to spin-1/2 fermions as well as to three-dimensional reductions of the Bethe-Salpeter equation different from Salpeter's equation.
|
1112.5992
|
Paul Langacker
|
Paul Langacker
|
Neutrino Masses from the Top Down
|
29 pages, 4 figures, to be submitted to Annual Reviews of Nuclear and
Particle Science
| null |
10.1146/annurev-nucl-102711-094925
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
General classes of mechanisms for generating small neutrino masses are
surveyed from a top-down (superstring) perspective. In particular, string
constructions have motivated various possibilities involving higher-dimensional
operators, string instantons, and wave function overlaps in large or warped
extra dimensions. These may yield small Dirac masses, Majorana masses via the
Weinberg operator, or Majorana masses from a seesaw mechanism, though the
latter typically differ in detail from the more conventional GUT models.
Possibilities for mixing between light active and sterile neutrinos are
surveyed.
|
[
{
"created": "Tue, 27 Dec 2011 18:07:14 GMT",
"version": "v1"
}
] |
2015-06-03
|
[
[
"Langacker",
"Paul",
""
]
] |
General classes of mechanisms for generating small neutrino masses are surveyed from a top-down (superstring) perspective. In particular, string constructions have motivated various possibilities involving higher-dimensional operators, string instantons, and wave function overlaps in large or warped extra dimensions. These may yield small Dirac masses, Majorana masses via the Weinberg operator, or Majorana masses from a seesaw mechanism, though the latter typically differ in detail from the more conventional GUT models. Possibilities for mixing between light active and sterile neutrinos are surveyed.
|
2204.03190
|
Tingfei Li
|
Bo Feng, Jianyu Gong, Tingfei Li
|
Universal Treatment of Reduction for One-Loop Integrals in Projective
Space
|
32 pages, 1 figure
| null |
10.1103/PhysRevD.106.056025
| null |
hep-ph hep-th
|
http://creativecommons.org/publicdomain/zero/1.0/
|
Recently a nice work about the understanding of one-loop integrals has been
done in [1] using the tricks of the projective space language associated to
their Feynman parametrization. We find this language is also very suitable to
deal with the reduction problem of one-loop integrals with general tensor
structures as well as propagators with arbitrary higher powers. In this paper,
we show that how to combine Feynman parametrization and embedding formalism to
give a universal treatment of reductions for general one-loop integrals, even
including the degenerated cases, such as the vanishing Gram determinant.
Results from this method can be written in a compact and symmetric form.
|
[
{
"created": "Thu, 7 Apr 2022 03:38:44 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Apr 2022 02:54:33 GMT",
"version": "v2"
},
{
"created": "Thu, 19 May 2022 11:42:50 GMT",
"version": "v3"
}
] |
2022-10-12
|
[
[
"Feng",
"Bo",
""
],
[
"Gong",
"Jianyu",
""
],
[
"Li",
"Tingfei",
""
]
] |
Recently a nice work about the understanding of one-loop integrals has been done in [1] using the tricks of the projective space language associated to their Feynman parametrization. We find this language is also very suitable to deal with the reduction problem of one-loop integrals with general tensor structures as well as propagators with arbitrary higher powers. In this paper, we show that how to combine Feynman parametrization and embedding formalism to give a universal treatment of reductions for general one-loop integrals, even including the degenerated cases, such as the vanishing Gram determinant. Results from this method can be written in a compact and symmetric form.
|
2207.06884
|
Deog Ki Hong
|
Deog Ki Hong, Sang Hui Im, Kwang Sik Jeong, Dong-han Yeom
|
Detecting axion dark matter with chiral magnetic effects
|
V3: 15 pages, 3 figures, abstract modified, expanded to add more
discussions on the experiments
| null | null |
PNUTP-22/A04; CTPU-PTC-22-16
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that dark matter axions or axion-like particles (ALP) induce
spontaneously alternating electric currents in conductors along the external
magnetic fields due to the (medium) axial anomaly, realizing the chiral
magnetic effects (CME). We propose a new experiment to measure this current to
detect the dark matter axions or ALP. These induced currents are the electron
medium effects, directly proportional to the axion or ALP coupling to
electrons, which depends on their microscopic physics. In the experimental
setup one measures both currents, the electric current due to CME and the
current due to the anomalous axion-photon coupling. However with ferromagnetic
conductors like irons the CME current can be dominant.
|
[
{
"created": "Thu, 14 Jul 2022 13:03:11 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Jan 2023 06:50:38 GMT",
"version": "v2"
},
{
"created": "Mon, 15 Jul 2024 12:19:30 GMT",
"version": "v3"
}
] |
2024-07-16
|
[
[
"Hong",
"Deog Ki",
""
],
[
"Im",
"Sang Hui",
""
],
[
"Jeong",
"Kwang Sik",
""
],
[
"Yeom",
"Dong-han",
""
]
] |
We show that dark matter axions or axion-like particles (ALP) induce spontaneously alternating electric currents in conductors along the external magnetic fields due to the (medium) axial anomaly, realizing the chiral magnetic effects (CME). We propose a new experiment to measure this current to detect the dark matter axions or ALP. These induced currents are the electron medium effects, directly proportional to the axion or ALP coupling to electrons, which depends on their microscopic physics. In the experimental setup one measures both currents, the electric current due to CME and the current due to the anomalous axion-photon coupling. However with ferromagnetic conductors like irons the CME current can be dominant.
|
1102.3590
|
Luca Di Luzio
|
Luca Di Luzio
|
Aspects of symmetry breaking in SO(10) GUTs
|
8 pages, 1 figure; prepared for the proceedings of DISCRETE'10 -
Symposium on Prospects in the Physics of Discrete Symmetries
| null |
10.1088/1742-6596/335/1/012025
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I review some recent results on the Higgs sector of minimal SO(10) grand
unified theories both with and without supersymmetry. It is shown that
nonsupersymmetric SO(10) with just one adjoint triggering the first stage of
the symmetry breaking does provide a successful gauge unification when
radiative corrections are taken into account in the scalar potential, while in
the supersymmetric case it is argued that the troubles in achieving a
phenomenologically viable breaking with representations up to the adjoint are
overcome by considering the flipped SO(10) embedding of the hypercharge.
|
[
{
"created": "Thu, 17 Feb 2011 14:30:03 GMT",
"version": "v1"
}
] |
2015-05-27
|
[
[
"Di Luzio",
"Luca",
""
]
] |
I review some recent results on the Higgs sector of minimal SO(10) grand unified theories both with and without supersymmetry. It is shown that nonsupersymmetric SO(10) with just one adjoint triggering the first stage of the symmetry breaking does provide a successful gauge unification when radiative corrections are taken into account in the scalar potential, while in the supersymmetric case it is argued that the troubles in achieving a phenomenologically viable breaking with representations up to the adjoint are overcome by considering the flipped SO(10) embedding of the hypercharge.
|
1603.09172
|
Toshihiko Ota
|
Masafumi Koike, Toshihiko Ota, Masako Saito, Joe Sato
|
Parametric Resonance in Neutrino Oscillation: A Guide to Control the
Effects of Inhomogeneous Matter Density
|
7 pages, 5 eps figures
| null |
10.1016/j.physletb.2016.05.083
|
STUPP-16-226
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Effects of the inhomogeneous matter density on the three-generation neutrino
oscillation probability are analyzed. Realistic profile of the matter density
is expanded into a Fourier series. Taking in the Fourier modes one by one, we
demonstrate that each mode has its corresponding target energy. The high
Fourier mode selectively modifies the oscillation probability of the low-energy
region. This rule is well described by the parametric resonance between the
neutrino oscillation and the matter effect. The Fourier analysis gives a simple
guideline to systematically control the uncertainty of the oscillation
probability caused by the uncertain density of matter. Precise analysis of the
oscillation probability down to the low-energy region requires accurate
evaluation of the Fourier coefficients of the matter density up to the
corresponding high modes.
|
[
{
"created": "Wed, 30 Mar 2016 13:13:20 GMT",
"version": "v1"
}
] |
2016-06-22
|
[
[
"Koike",
"Masafumi",
""
],
[
"Ota",
"Toshihiko",
""
],
[
"Saito",
"Masako",
""
],
[
"Sato",
"Joe",
""
]
] |
Effects of the inhomogeneous matter density on the three-generation neutrino oscillation probability are analyzed. Realistic profile of the matter density is expanded into a Fourier series. Taking in the Fourier modes one by one, we demonstrate that each mode has its corresponding target energy. The high Fourier mode selectively modifies the oscillation probability of the low-energy region. This rule is well described by the parametric resonance between the neutrino oscillation and the matter effect. The Fourier analysis gives a simple guideline to systematically control the uncertainty of the oscillation probability caused by the uncertain density of matter. Precise analysis of the oscillation probability down to the low-energy region requires accurate evaluation of the Fourier coefficients of the matter density up to the corresponding high modes.
|
hep-ph/0602045
|
Thorsten Renk
|
Thorsten Renk
|
Through the blackness -- high p_T hadrons probing the central region of
200 AGeV Au-Au collisions
|
6 pages, 2 figures, expanded version with update of experimental data
|
Phys.Rev. C74 (2006) 024903
|
10.1103/PhysRevC.74.024903
| null |
hep-ph
| null |
The energy loss of high p_T partons propagating through a hot and dense
medium is regarded as a valuable tool to probe the medium created in
ultrarelativistic heavy-ion collisions. The angular correlation pattern of
hadrons associated with a hard trigger in the region of p_T ~1-2 GeV which
exhibits a dip in the expected position of the away side jet has given rise to
the idea that energy is lost predominantly to propagating collective modes
('Mach cones'). Recent measurements by the STAR collaboration have shown that
for a high p_T > 8 GeV trigger the angular pattern of associate hadrons for p_T
> 4 GeV shows the emergence of the expected away side peak. These di-jet events
suggest that the away side parton may emerge occasionally without substantial
energy loss. Since in such a back-to-back configuration one of the partons may
travel through the central region of the fireball, the average in-medium
pathlength is substantial and the expected energy loss is not only sensitive to
the initial geometry of matter but also to the change of geometry due to
expansion. We show that radiative energy loss is able to explain the dijet
events provided that the expansion of the medium is taken into account.
|
[
{
"created": "Mon, 6 Feb 2006 11:33:04 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Mar 2006 11:17:53 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Jul 2006 09:01:08 GMT",
"version": "v3"
}
] |
2009-11-11
|
[
[
"Renk",
"Thorsten",
""
]
] |
The energy loss of high p_T partons propagating through a hot and dense medium is regarded as a valuable tool to probe the medium created in ultrarelativistic heavy-ion collisions. The angular correlation pattern of hadrons associated with a hard trigger in the region of p_T ~1-2 GeV which exhibits a dip in the expected position of the away side jet has given rise to the idea that energy is lost predominantly to propagating collective modes ('Mach cones'). Recent measurements by the STAR collaboration have shown that for a high p_T > 8 GeV trigger the angular pattern of associate hadrons for p_T > 4 GeV shows the emergence of the expected away side peak. These di-jet events suggest that the away side parton may emerge occasionally without substantial energy loss. Since in such a back-to-back configuration one of the partons may travel through the central region of the fireball, the average in-medium pathlength is substantial and the expected energy loss is not only sensitive to the initial geometry of matter but also to the change of geometry due to expansion. We show that radiative energy loss is able to explain the dijet events provided that the expansion of the medium is taken into account.
|
1110.0430
|
Jose M. Carmona
|
J.M. Carmona and J.L. Cortes
|
Constraints from Neutrino Decay on Superluminal Velocities
| null | null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The splitting of neutrinos, a viable reaction for superluminal neutrinos, is
shown to have phenomenologically relevant consequences if one accepts the
recent OPERA results for the velocity of neutrinos. Neutrino splitting can be
used to put strong constraints on the energy dependence of the velocity of
propagation of neutrinos in a general analysis of modifications of relativistic
kinematics and to propose observable effects due to the departures from special
relativity in neutrino physics.
|
[
{
"created": "Mon, 3 Oct 2011 17:47:42 GMT",
"version": "v1"
}
] |
2011-10-04
|
[
[
"Carmona",
"J. M.",
""
],
[
"Cortes",
"J. L.",
""
]
] |
The splitting of neutrinos, a viable reaction for superluminal neutrinos, is shown to have phenomenologically relevant consequences if one accepts the recent OPERA results for the velocity of neutrinos. Neutrino splitting can be used to put strong constraints on the energy dependence of the velocity of propagation of neutrinos in a general analysis of modifications of relativistic kinematics and to propose observable effects due to the departures from special relativity in neutrino physics.
|
0710.2644
|
Koji Tsumura
|
Shinya Kanemura, Koichi Matsuda, Daisuke Nomura, Koji Tsumura
|
New physics effect on the top-Yukawa coupling at ILC
|
Submitted for the LCWS07 proceedings, 5 pages, 4 eps figures,
ilcws07.cls, references added
|
ECONF C0705302:HIG17,2007
| null |
KEK-TH-1194
|
hep-ph
| null |
Measurement of the top-Yukawa coupling is important to understand the fermion
mass generation mechanism and dynamics of electroweak symmetry breaking. We
discuss the top quark anomalous couplings which can be described by higher
dimensional operators. We investigate the process $e^-e^+ \to W^-W^+\nu\bar\nu
\to t \bar t \nu\bar\nu$ to study the contribution of the anomalous top-Higgs
coupling to the cross section. The effect of the dimension-six top-Higgs
interaction on the cross section can be a few hundred percent greater than the
SM prediction. Such a large effect can be measured at the International Linear
Collider.
|
[
{
"created": "Sun, 14 Oct 2007 10:12:05 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Oct 2007 12:51:05 GMT",
"version": "v2"
}
] |
2009-02-16
|
[
[
"Kanemura",
"Shinya",
""
],
[
"Matsuda",
"Koichi",
""
],
[
"Nomura",
"Daisuke",
""
],
[
"Tsumura",
"Koji",
""
]
] |
Measurement of the top-Yukawa coupling is important to understand the fermion mass generation mechanism and dynamics of electroweak symmetry breaking. We discuss the top quark anomalous couplings which can be described by higher dimensional operators. We investigate the process $e^-e^+ \to W^-W^+\nu\bar\nu \to t \bar t \nu\bar\nu$ to study the contribution of the anomalous top-Higgs coupling to the cross section. The effect of the dimension-six top-Higgs interaction on the cross section can be a few hundred percent greater than the SM prediction. Such a large effect can be measured at the International Linear Collider.
|
0912.3647
|
Pedro Schwaller
|
A. Freitas, P. Schwaller, D. Wyler
|
Phenomenology of the Little Higgs model with X-Parity
|
12 pages, to appear in in the proceedings of the International
Workshop on Beyond the Standard Model Physics and LHC Signatures (BSM-LHC)
and of the 17th International Conference on Supersymmetry and the Unification
of Fundamental Interactions (SUSY09), Boston, USA, 2-4 and 5-10 Jun 2009
|
Nucl.Phys.Proc.Suppl. 200-202: 169-175,2010
|
10.1016/j.nuclphysbps.2010.02.079; 10.1063/1.3327686
|
ZU-TH 21/09
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the popular littlest Higgs model, T-parity can be broken by
Wess-Zumino-Witten (WZW) terms induced by a strongly coupled UV completion. On
the other hand, certain models with multiple scalar multiplets (called moose
models) permit the implementation of an exchange symmetry (X-parity) such that
it is not broken by the WZW terms. Here we present a concrete and realistic
construction of such a model. The little Higgs model with X-Parity is a
concrete and realistic implementation of this idea. In this contribution, the
properties of the model are reviewed and the collider phenomenology is
discussed in some detail. We also present new results on the decay properties
and LHC signatures of the light triplet scalars that are predicted by this
model.
|
[
{
"created": "Fri, 18 Dec 2009 11:24:27 GMT",
"version": "v1"
}
] |
2014-11-20
|
[
[
"Freitas",
"A.",
""
],
[
"Schwaller",
"P.",
""
],
[
"Wyler",
"D.",
""
]
] |
In the popular littlest Higgs model, T-parity can be broken by Wess-Zumino-Witten (WZW) terms induced by a strongly coupled UV completion. On the other hand, certain models with multiple scalar multiplets (called moose models) permit the implementation of an exchange symmetry (X-parity) such that it is not broken by the WZW terms. Here we present a concrete and realistic construction of such a model. The little Higgs model with X-Parity is a concrete and realistic implementation of this idea. In this contribution, the properties of the model are reviewed and the collider phenomenology is discussed in some detail. We also present new results on the decay properties and LHC signatures of the light triplet scalars that are predicted by this model.
|
1901.07058
|
Francisco del Aguila
|
F. del Aguila, Ll. Ametller, J.I. Illana, J. Santiago, P. Talavera, R.
Vega-Morales
|
The Full Lepton Flavor of the Littlest Higgs Model with T-parity
|
50 pages, 11 figures. Enlarged phenomenological discussion. New
figures and references added. v3: Matches published version, 45 pages, 12
figures
| null |
10.1007/JHEP07(2019)154
|
CAFPE-200/19, UG-FT-330/19
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We re-examine lepton flavor violation (LFV) in the Littlest Higgs model with
T--parity (LHT) including the full T--odd (non-singlet) lepton and Goldstone
sectors. The heavy leptons induce two independent sources of LFV associated
with the couplings necessary to give masses to the T--odd mirror fermions and
to their partners in right-handed $SO(5)$ multiplets, respectively. The latter,
which have been neglected in the past, can be decoupled from gauge mediated
processes but not from Higgs mediated ones and must therefore also be included
in a general analysis of LFV in the LHT. We also further extend previous
analyses by considering on-shell $Z$ and Higgs LFV decays together with the LFV
processes at low momentum transfer. We show that current experimental limits
can probe the LHT parameter space up to global symmetry breaking scales $f \sim
10$ TeV. For lower $f$ values $\gtrsim 1$ TeV, $\mu-e$ transitions require the
misalignment between the heavy and the Standard Model charged leptons to be
$\lesssim 1 \, \%$. Future LFV experiments using intense muon beams should be
sensitive to misalignments below the per mille level. For $\tau$ LFV
transitions, which could potentially be observed at Belle II and the LHC as
well as future lepton colliders, we find that generically they can not
discriminate between the LHT and supersymmetric models though in some regions
of parameter space this may be possible.
|
[
{
"created": "Mon, 21 Jan 2019 20:01:33 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Feb 2019 16:42:46 GMT",
"version": "v2"
},
{
"created": "Mon, 22 Jul 2019 13:22:00 GMT",
"version": "v3"
}
] |
2019-09-04
|
[
[
"del Aguila",
"F.",
""
],
[
"Ametller",
"Ll.",
""
],
[
"Illana",
"J. I.",
""
],
[
"Santiago",
"J.",
""
],
[
"Talavera",
"P.",
""
],
[
"Vega-Morales",
"R.",
""
]
] |
We re-examine lepton flavor violation (LFV) in the Littlest Higgs model with T--parity (LHT) including the full T--odd (non-singlet) lepton and Goldstone sectors. The heavy leptons induce two independent sources of LFV associated with the couplings necessary to give masses to the T--odd mirror fermions and to their partners in right-handed $SO(5)$ multiplets, respectively. The latter, which have been neglected in the past, can be decoupled from gauge mediated processes but not from Higgs mediated ones and must therefore also be included in a general analysis of LFV in the LHT. We also further extend previous analyses by considering on-shell $Z$ and Higgs LFV decays together with the LFV processes at low momentum transfer. We show that current experimental limits can probe the LHT parameter space up to global symmetry breaking scales $f \sim 10$ TeV. For lower $f$ values $\gtrsim 1$ TeV, $\mu-e$ transitions require the misalignment between the heavy and the Standard Model charged leptons to be $\lesssim 1 \, \%$. Future LFV experiments using intense muon beams should be sensitive to misalignments below the per mille level. For $\tau$ LFV transitions, which could potentially be observed at Belle II and the LHC as well as future lepton colliders, we find that generically they can not discriminate between the LHT and supersymmetric models though in some regions of parameter space this may be possible.
|
hep-ph/0010271
|
Eugene Levin
|
Eugene Levin (Tel Aviv U. /DESY)
|
Soft Pomeron in QCD
|
6 pages, 9 figures in eps. files
|
Nucl.Phys.Proc.Suppl. 99A (2001) 126-130
|
10.1016/S0920-5632(01)01320-2
|
TAUP 2650-2000
|
hep-ph
| null |
This is a talk, given at Diffraction'2000, Sept. 2 - 7, Centraro, Italy. This
talk is a brief presentation of our view on the Pomeron, as a non-perturbative
QCD phenomenon but from sufficiently short distances. Our approach is based on
the scale anomaly of QCD and emphasizes the r{\^o}le of semi-classical QCD
vacuum fields. We show that both the intercept and the slope of Pomeron
trajectory appear to be determined by the energy density of non-perturbative
QCD vacuum. The particular example of semi-classical QCD vacuum fields is
discussed based on a new type of instanton-induced interactions (``instanton
ladder'') that leads to the rising with energy cross section $\sigma \sim
s^{\Delta_P}$ of Regge type (the Pomeron).
|
[
{
"created": "Tue, 24 Oct 2000 11:44:45 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Levin",
"Eugene",
"",
"Tel Aviv U. /DESY"
]
] |
This is a talk, given at Diffraction'2000, Sept. 2 - 7, Centraro, Italy. This talk is a brief presentation of our view on the Pomeron, as a non-perturbative QCD phenomenon but from sufficiently short distances. Our approach is based on the scale anomaly of QCD and emphasizes the r{\^o}le of semi-classical QCD vacuum fields. We show that both the intercept and the slope of Pomeron trajectory appear to be determined by the energy density of non-perturbative QCD vacuum. The particular example of semi-classical QCD vacuum fields is discussed based on a new type of instanton-induced interactions (``instanton ladder'') that leads to the rising with energy cross section $\sigma \sim s^{\Delta_P}$ of Regge type (the Pomeron).
|
1711.05977
|
Kazem Azizi
|
H. Sundu, S. S. Agaev, K. Azizi
|
The new $a_1(1420)$ state: structure, mass and width
|
11 Pages and 3 Figures, To be published in Phys. Rev. D
|
Phys. Rev. D 97, 054001 (2018)
|
10.1103/PhysRevD.97.054001
| null |
hep-ph hep-ex hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The structure, spectroscopic parameters and width of the resonance with
quantum numbers $J^{PC}=1^{++}$ discovered by the COMPASS Collaboration and
classified as the $a_1(1420)$ meson are examined in the context of QCD sum rule
method. In the calculations the axial-vector meson $a_1(1420)$ is treated as a
four-quark state with the diquark-antidiquark structure. The mass and current
coupling of $a_1(1420)$ are evaluated using QCD two-point sum rule approach.
Its observed decay mode $a_1(1420) \to f_0(980)\pi$, and kinematically allowed
ones, namely $a_1 \to K^{\ast \pm}K^{\mp}$, $a_1 \to K^{\ast 0} \bar{K}^{0}$
and $a_1 \to \bar {K}^{\ast 0} K^{0}$ channels are studied employing QCD sum
rules on the light-cone. Our prediction for the mass of the $a_1(1420)$ state
$m_{a_{1}}=1416_{-79}^{+81}\ \mathrm{MeV}$ is in excellent agreement with the
experimental result. Width of this state $ \Gamma=145.52 \pm 20.79
\mathrm{MeV}$ within theoretical and experimental errors is also in accord with
the COMPASS data.
|
[
{
"created": "Thu, 16 Nov 2017 08:10:35 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Feb 2018 09:49:22 GMT",
"version": "v2"
}
] |
2018-03-14
|
[
[
"Sundu",
"H.",
""
],
[
"Agaev",
"S. S.",
""
],
[
"Azizi",
"K.",
""
]
] |
The structure, spectroscopic parameters and width of the resonance with quantum numbers $J^{PC}=1^{++}$ discovered by the COMPASS Collaboration and classified as the $a_1(1420)$ meson are examined in the context of QCD sum rule method. In the calculations the axial-vector meson $a_1(1420)$ is treated as a four-quark state with the diquark-antidiquark structure. The mass and current coupling of $a_1(1420)$ are evaluated using QCD two-point sum rule approach. Its observed decay mode $a_1(1420) \to f_0(980)\pi$, and kinematically allowed ones, namely $a_1 \to K^{\ast \pm}K^{\mp}$, $a_1 \to K^{\ast 0} \bar{K}^{0}$ and $a_1 \to \bar {K}^{\ast 0} K^{0}$ channels are studied employing QCD sum rules on the light-cone. Our prediction for the mass of the $a_1(1420)$ state $m_{a_{1}}=1416_{-79}^{+81}\ \mathrm{MeV}$ is in excellent agreement with the experimental result. Width of this state $ \Gamma=145.52 \pm 20.79 \mathrm{MeV}$ within theoretical and experimental errors is also in accord with the COMPASS data.
|
0902.4830
|
Tord Riemann
|
Janusz Gluza (U. Katowice), Krzysztof Kajda (U. Katowice), Tord
Riemann (DESY), Valery Yundin (DESY)
|
New results for loop integrals: AMBRE, CSectors, hexagon
|
9 pages, 1 figure, subm. to PoS(ACAT08)124
|
POS ACAT08:124,2008
| null |
DESY 09-012, SFB/CPP-09-12, HEPTOOLS 08-230
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report on the three Mathematica packages hexagon, CSectors, AMBRE. They
are useful for the evaluation of one- and two-loop Feynman integrals with a
dependence on several kinematical scales. These integrals are typically needed
for LHC and ILC applications, but also for higher order corrections at meson
factories. hexagon is a new package for the tensor reduction of one-loop
5-point and 6-point functions with rank R=3 and R=4, respectively; AMBRE is a
tool for derivations of Mellin-Barnes representations; CSectors is an interface
for the package sector_decomposition and allows a convenient, direct evaluation
of tensor Feynman integrals.
|
[
{
"created": "Fri, 27 Feb 2009 13:39:19 GMT",
"version": "v1"
}
] |
2014-11-18
|
[
[
"Gluza",
"Janusz",
"",
"U. Katowice"
],
[
"Kajda",
"Krzysztof",
"",
"U. Katowice"
],
[
"Riemann",
"Tord",
"",
"DESY"
],
[
"Yundin",
"Valery",
"",
"DESY"
]
] |
We report on the three Mathematica packages hexagon, CSectors, AMBRE. They are useful for the evaluation of one- and two-loop Feynman integrals with a dependence on several kinematical scales. These integrals are typically needed for LHC and ILC applications, but also for higher order corrections at meson factories. hexagon is a new package for the tensor reduction of one-loop 5-point and 6-point functions with rank R=3 and R=4, respectively; AMBRE is a tool for derivations of Mellin-Barnes representations; CSectors is an interface for the package sector_decomposition and allows a convenient, direct evaluation of tensor Feynman integrals.
|
2009.05930
|
Yi-Lun Chung
|
Yi-Lun Chung, Shih-Chieh Hsu, and Benjamin Nachman
|
Disentangling Boosted Higgs Boson Production Modes with Machine Learning
|
17 pages, 9 figures
|
JINST 16 P07002 (2021)
|
10.1088/1748-0221/16/07/P07002
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Higgs Bosons produced via gluon-gluon fusion (ggF) with large transverse
momentum ($p_T$) are sensitive probes of physics beyond the Standard Model.
However, high $p_T$ Higgs Boson production is contaminated by a diversity of
production modes other than ggF: vector boson fusion, production of a Higgs
boson in association with a vector boson, and production of a Higgs boson with
a top-quark pair. Combining jet substructure and event information with modern
machine learning, we demonstrate the ability to focus on particular production
modes. These tools hold great discovery potential for boosted Higgs bosons
produced via ggF and may also provide additional information about the Higgs
Boson sector of the Standard Model in extreme phase space regions for other
production modes as well.
|
[
{
"created": "Sun, 13 Sep 2020 06:13:24 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Sep 2020 01:19:39 GMT",
"version": "v2"
},
{
"created": "Thu, 24 Dec 2020 13:41:08 GMT",
"version": "v3"
},
{
"created": "Tue, 27 Apr 2021 13:05:34 GMT",
"version": "v4"
}
] |
2022-06-30
|
[
[
"Chung",
"Yi-Lun",
""
],
[
"Hsu",
"Shih-Chieh",
""
],
[
"Nachman",
"Benjamin",
""
]
] |
Higgs Bosons produced via gluon-gluon fusion (ggF) with large transverse momentum ($p_T$) are sensitive probes of physics beyond the Standard Model. However, high $p_T$ Higgs Boson production is contaminated by a diversity of production modes other than ggF: vector boson fusion, production of a Higgs boson in association with a vector boson, and production of a Higgs boson with a top-quark pair. Combining jet substructure and event information with modern machine learning, we demonstrate the ability to focus on particular production modes. These tools hold great discovery potential for boosted Higgs bosons produced via ggF and may also provide additional information about the Higgs Boson sector of the Standard Model in extreme phase space regions for other production modes as well.
|
2008.07232
|
Vladimir Saleev
|
Anton Karpishkov, Maxim Nefedov and Vladimir Saleev
|
Estimates for the single-spin asymmetries in $p^{\uparrow}p \to J/\psi
X$ process at PHENIX RHIC and SPD NICA
|
19 pages, 7 figures
|
Phys. Rev. D 104, 016008 (2021)
|
10.1103/PhysRevD.104.016008
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the transverse single-spin asymmetry (TSSA) in $p^{\uparrow}p \to
J/\psi X$ reaction, incorporating both transverse-momentum and spin effects. To
predict production cross section of prompt $J/\psi$ we use two different
approaches, the non-relativistic QCD (NRQCD) factorization approach and the
Improved Color Evaporation Model (ICEM), and show how the predicted results for
TSSAs depend on choice of hadronization model. For initial-state factorization
we consider two models: the standard Generalized Parton Model (GPM) and the
Colour Gauge-Invariant version of it (CGI-GPM). We demonstrate that PHENIX
collaboration data on TSSA in the process $p^{\uparrow}p \to J/\psi X$
constrain the gluon Sivers function of the proton and rule-out one of existing
parameterizations. Estimates for the TSSAs in $p^{\uparrow}p \to J/\psi X$
process for the conditions of the future SPD NICA experiment are presented for
the first time.
|
[
{
"created": "Mon, 17 Aug 2020 11:56:54 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Apr 2021 11:42:56 GMT",
"version": "v2"
}
] |
2021-07-14
|
[
[
"Karpishkov",
"Anton",
""
],
[
"Nefedov",
"Maxim",
""
],
[
"Saleev",
"Vladimir",
""
]
] |
We study the transverse single-spin asymmetry (TSSA) in $p^{\uparrow}p \to J/\psi X$ reaction, incorporating both transverse-momentum and spin effects. To predict production cross section of prompt $J/\psi$ we use two different approaches, the non-relativistic QCD (NRQCD) factorization approach and the Improved Color Evaporation Model (ICEM), and show how the predicted results for TSSAs depend on choice of hadronization model. For initial-state factorization we consider two models: the standard Generalized Parton Model (GPM) and the Colour Gauge-Invariant version of it (CGI-GPM). We demonstrate that PHENIX collaboration data on TSSA in the process $p^{\uparrow}p \to J/\psi X$ constrain the gluon Sivers function of the proton and rule-out one of existing parameterizations. Estimates for the TSSAs in $p^{\uparrow}p \to J/\psi X$ process for the conditions of the future SPD NICA experiment are presented for the first time.
|
hep-ph/9805325
|
Robert Peschanski
|
R. Peschanski (SPhT)
|
``Good-Walker'' + QCD dipoles = Hard Diffraction
|
6 pages latex + figure.eps; Invited talk at the DIS98 workshop,
Brussels, April 1998
| null | null | null |
hep-ph
| null |
The Good-Walker mechanism for diffraction is shown to provide a link between
total and diffractive structure functions and to be relevant for QCD
calculations at small x_{Bj}. For Deep-Inelastic scattering on a small-size
target (cf. an onium) the r\^ ole of Good-Walker ``diffractive eigenstates'' is
played by the QCD dipoles appearing in the $1/N_C$ limit of QCD. Hard
diffraction is thus related to the QCD tripe-dipole vertex which has been
recently identified (and calculated) as being a conformal invariant correlator
and/or a closed-string amplitude. An extension to hard diffraction at HERA via
$k_T-$factorisation of the proton vertices leads to interesting phenomenology.
|
[
{
"created": "Thu, 14 May 1998 12:59:00 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Peschanski",
"R.",
"",
"SPhT"
]
] |
The Good-Walker mechanism for diffraction is shown to provide a link between total and diffractive structure functions and to be relevant for QCD calculations at small x_{Bj}. For Deep-Inelastic scattering on a small-size target (cf. an onium) the r\^ ole of Good-Walker ``diffractive eigenstates'' is played by the QCD dipoles appearing in the $1/N_C$ limit of QCD. Hard diffraction is thus related to the QCD tripe-dipole vertex which has been recently identified (and calculated) as being a conformal invariant correlator and/or a closed-string amplitude. An extension to hard diffraction at HERA via $k_T-$factorisation of the proton vertices leads to interesting phenomenology.
|
0711.3119
|
Alexei Nefediev
|
A.V.Nefediev (ITEP, Moscow)
|
Chiral symmetry breaking and Lorentz nature of confinement
|
4 pages, no figures, specialized style files included. Talk given at
13th Lomonosov Conference on Elementary Particle Physics, Moscow, Russia,
23-29 August 2007, to appear in Proceedings
| null | null | null |
hep-ph
| null |
The Lorentz nature of confinement in a heavy-light quarkonium is
investigated. It is demonstrated that an effective scalar interaction is
generated selfconsistently as a result of chiral symmetry breaking, and this
effective scalar interaction is responsible for the QCD string formation
between the quark and the antiquark.
|
[
{
"created": "Tue, 20 Nov 2007 11:46:35 GMT",
"version": "v1"
}
] |
2007-11-21
|
[
[
"Nefediev",
"A. V.",
"",
"ITEP, Moscow"
]
] |
The Lorentz nature of confinement in a heavy-light quarkonium is investigated. It is demonstrated that an effective scalar interaction is generated selfconsistently as a result of chiral symmetry breaking, and this effective scalar interaction is responsible for the QCD string formation between the quark and the antiquark.
|
1808.00226
|
Alfredo Valcarce
|
H. Garcilazo, A. Valcarce
|
$T_{bbb}$: a three $B-$meson bound state
|
11 pages, 2 figures, to appear in Phys. Lett. B
|
Phys. Lett. B784, 169-172 (2018)
|
10.1016/j.physletb.2018.07.055
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
By solving exactly the Faddeev equations for the bound-state problem of three
mesons, we demonstrate that current theoretical predictions pointing to the
existence of a deeply-bound doubly bottom axial vector tetraquark lead to the
existence of a unique bound state of three $B$ mesons. We find that the
$BB^*B^*-B^*B^*B^*$ state with quantum numbers $(I)J^P=(1/2)2^-$, $T_{bbb}$, is
about 90\,MeV below any possible three $B$-meson threshold for the reported
binding of the doubly bottom axial vector tetraquark, $T_{bb}$.
|
[
{
"created": "Wed, 1 Aug 2018 08:45:04 GMT",
"version": "v1"
}
] |
2018-08-07
|
[
[
"Garcilazo",
"H.",
""
],
[
"Valcarce",
"A.",
""
]
] |
By solving exactly the Faddeev equations for the bound-state problem of three mesons, we demonstrate that current theoretical predictions pointing to the existence of a deeply-bound doubly bottom axial vector tetraquark lead to the existence of a unique bound state of three $B$ mesons. We find that the $BB^*B^*-B^*B^*B^*$ state with quantum numbers $(I)J^P=(1/2)2^-$, $T_{bbb}$, is about 90\,MeV below any possible three $B$-meson threshold for the reported binding of the doubly bottom axial vector tetraquark, $T_{bb}$.
|
2103.13396
|
Soubhik Kumar
|
Majid Ekhterachian, Anson Hook, Soubhik Kumar, Yuhsin Tsai
|
Bounds on Gauge Bosons Coupled to Non-conserved Currents
|
v1: 5+6 pages, 2+2 figures; v2: new discussions and references added
|
Phys. Rev. D 104, 035034 (2021)
|
10.1103/PhysRevD.104.035034
| null |
hep-ph astro-ph.CO
|
http://creativecommons.org/licenses/by/4.0/
|
We discuss new bounds on vectors coupled to currents whose non-conservation
is due to mass terms, such as $U(1)_{L_\mu - L_\tau}$. Due to the emission of
many final state longitudinally polarized gauge bosons, inclusive rates grow
exponentially fast in energy, leading to constraints that are only
logarithmically dependent on the symmetry breaking mass term. This exponential
growth is unique to Stueckelberg theories and reverts back to polynomial growth
at energies above the mass of the radial mode. We present bounds coming from
the high transverse mass tail of mono-lepton+missing transverse energy events
at the LHC, which beat out cosmological bounds to place the strongest limit on
Stueckelberg $U(1)_{L_\mu - L_\tau}$ models for most masses below a keV. We
also discuss a stronger, but much more uncertain, bound coming from the
validity of perturbation theory at the LHC.
|
[
{
"created": "Wed, 24 Mar 2021 18:00:00 GMT",
"version": "v1"
},
{
"created": "Fri, 21 May 2021 17:56:48 GMT",
"version": "v2"
}
] |
2021-09-08
|
[
[
"Ekhterachian",
"Majid",
""
],
[
"Hook",
"Anson",
""
],
[
"Kumar",
"Soubhik",
""
],
[
"Tsai",
"Yuhsin",
""
]
] |
We discuss new bounds on vectors coupled to currents whose non-conservation is due to mass terms, such as $U(1)_{L_\mu - L_\tau}$. Due to the emission of many final state longitudinally polarized gauge bosons, inclusive rates grow exponentially fast in energy, leading to constraints that are only logarithmically dependent on the symmetry breaking mass term. This exponential growth is unique to Stueckelberg theories and reverts back to polynomial growth at energies above the mass of the radial mode. We present bounds coming from the high transverse mass tail of mono-lepton+missing transverse energy events at the LHC, which beat out cosmological bounds to place the strongest limit on Stueckelberg $U(1)_{L_\mu - L_\tau}$ models for most masses below a keV. We also discuss a stronger, but much more uncertain, bound coming from the validity of perturbation theory at the LHC.
|
1203.6652
|
Paolo Panci
|
Eugenio Del Nobile, Chris Kouvaris, Paolo Panci, Francesco Sannino,
Jussi Virkajarvi
|
Light Magnetic Dark Matter in Direct Detection Searches
|
32 pages, 5+1 figures; v2: matches version published on JCAP,
dipole-dipole interaction added, discussion on its magnitude added in
appendix, few typos corrected and some references added, results
strengthened. arXiv admin note: text overlap with arXiv:1108.4661
| null |
10.1088/1475-7516/2012/08/010
|
CP3-ORIGINS-2012-007; DIAS-2012-8
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study a fermionic Dark Matter particle carrying magnetic dipole moment and
analyze its impact on direct detection experiments. In particular we show that
it can accommodate the DAMA, CoGeNT and CRESST experimental results. Assuming
conservative bounds, this candidate is shown not to be ruled out by the CDMS,
XENON and PICASSO experiments. We offer an analytic understanding of how the
long-range interaction modifies the experimental allowed regions, in the cross
section versus Dark Matter mass parameter space, with respect to the typically
assumed contact interaction. Finally, in the context of a symmetric Dark Matter
sector, we determine the associated thermal relic density, and further provide
relevant constraints imposed by indirect searches and colliders.
|
[
{
"created": "Thu, 29 Mar 2012 20:00:04 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Jul 2012 08:51:37 GMT",
"version": "v2"
}
] |
2015-06-04
|
[
[
"Del Nobile",
"Eugenio",
""
],
[
"Kouvaris",
"Chris",
""
],
[
"Panci",
"Paolo",
""
],
[
"Sannino",
"Francesco",
""
],
[
"Virkajarvi",
"Jussi",
""
]
] |
We study a fermionic Dark Matter particle carrying magnetic dipole moment and analyze its impact on direct detection experiments. In particular we show that it can accommodate the DAMA, CoGeNT and CRESST experimental results. Assuming conservative bounds, this candidate is shown not to be ruled out by the CDMS, XENON and PICASSO experiments. We offer an analytic understanding of how the long-range interaction modifies the experimental allowed regions, in the cross section versus Dark Matter mass parameter space, with respect to the typically assumed contact interaction. Finally, in the context of a symmetric Dark Matter sector, we determine the associated thermal relic density, and further provide relevant constraints imposed by indirect searches and colliders.
|
1908.08417
|
Pritam Das
|
Pritam Das, Mrinal Kumar Das
|
Phenomenology of $keV$ sterile neutrino in minimal extended seesaw
|
26 pages, 10 figures, to appear IJMPA
| null |
10.1142/S0217751X20501250
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We explore the possibility of a single generation of $keV$ scale sterile
neutrino ($m_S$) as a dark matter candidate within the minimal extended seesaw
(MES) framework and it's influence in neutrinoless double beta decay
($0\nu\beta\beta$) study. Three hierarchical right-handed neutrinos were
considered to explain neutrino mass. We also address baryogenesis via the
mechanism of thermal leptogenesis considering the decay of the lightest RH
neutrino to a lepton and Higgs doublet. A generic model based on $A_4\times
Z_4\times Z_3$ flavor symmetry is constructed to explain both normal and
inverted hierarchy mass pattern of neutrinos. Significant results on effective
neutrino masses are observed in presence of sterile mass ($m_S$) and
active-sterile mixing ($\theta_{S}$) in $0\nu\beta\beta$. Results from
$0\nu\beta\beta$ give stringent upper bounds on the active-sterile mixing
matrix element. To establish sterile neutrino as dark matter within this model,
we checked decay width and relic abundance of the sterile neutrino, which
restricted sterile mass ($m_S$) within some definite bounds. Constrained
regions on the CP-phases and Yukawa couplings are obtained from
$0\nu\beta\beta$ and baryogenesis results. Co-relations among these observable
are also established and discussed within this framework.
|
[
{
"created": "Thu, 22 Aug 2019 14:48:39 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Jul 2020 17:22:19 GMT",
"version": "v2"
}
] |
2020-08-26
|
[
[
"Das",
"Pritam",
""
],
[
"Das",
"Mrinal Kumar",
""
]
] |
We explore the possibility of a single generation of $keV$ scale sterile neutrino ($m_S$) as a dark matter candidate within the minimal extended seesaw (MES) framework and it's influence in neutrinoless double beta decay ($0\nu\beta\beta$) study. Three hierarchical right-handed neutrinos were considered to explain neutrino mass. We also address baryogenesis via the mechanism of thermal leptogenesis considering the decay of the lightest RH neutrino to a lepton and Higgs doublet. A generic model based on $A_4\times Z_4\times Z_3$ flavor symmetry is constructed to explain both normal and inverted hierarchy mass pattern of neutrinos. Significant results on effective neutrino masses are observed in presence of sterile mass ($m_S$) and active-sterile mixing ($\theta_{S}$) in $0\nu\beta\beta$. Results from $0\nu\beta\beta$ give stringent upper bounds on the active-sterile mixing matrix element. To establish sterile neutrino as dark matter within this model, we checked decay width and relic abundance of the sterile neutrino, which restricted sterile mass ($m_S$) within some definite bounds. Constrained regions on the CP-phases and Yukawa couplings are obtained from $0\nu\beta\beta$ and baryogenesis results. Co-relations among these observable are also established and discussed within this framework.
|
2104.06988
|
Mengchao Zhang
|
Mengchao Zhang
|
Leptophilic Composite Asymmetric Dark Matter and its Detection
|
CEPC analysis updated
|
Phys. Rev. D 104, 055008 (2021)
|
10.1103/PhysRevD.104.055008
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a model which explains the baryon asymmetry of the universe and
dark matter relic density at the same time. In this model, dark matter
candidate is the dark baryon composed by dark quarks. A scalar mediator, which
couples to the standard model leptons and dark quarks, is introduced to
generate the asymmetry of baryon and dark baryon simultaneously. Direct
detection and collider detection of this model are studied. We find that
current underground direct detection experiments and LHC can hardly detect this
model. But future lepton colliders, such as CEPC, have great potential to
detect a large portion of the model parameter space by "displaced lepton jet"
signal.
|
[
{
"created": "Wed, 14 Apr 2021 17:15:24 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Jun 2021 17:53:47 GMT",
"version": "v2"
}
] |
2021-09-15
|
[
[
"Zhang",
"Mengchao",
""
]
] |
We propose a model which explains the baryon asymmetry of the universe and dark matter relic density at the same time. In this model, dark matter candidate is the dark baryon composed by dark quarks. A scalar mediator, which couples to the standard model leptons and dark quarks, is introduced to generate the asymmetry of baryon and dark baryon simultaneously. Direct detection and collider detection of this model are studied. We find that current underground direct detection experiments and LHC can hardly detect this model. But future lepton colliders, such as CEPC, have great potential to detect a large portion of the model parameter space by "displaced lepton jet" signal.
|
1506.05186
|
Luis E. Oxman
|
L. E. Oxman
|
Hybrid mesons as systems of confined monopoles
|
LaTeX, 12 pages, brief review based on my talk at the Fourth Winter
Workshop on Nonperturbative Quantum Field Theory, Sophia-Antipolis, France,
Feb. 2015
| null | null | null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review some recent ideas regarding classical topological objects in dual
superconductor models that could represent different confining states of the
gluon field. We also comment about natural components in (magnetic) ensembles
that could effectively originate these models at large distances.
|
[
{
"created": "Wed, 17 Jun 2015 02:30:36 GMT",
"version": "v1"
}
] |
2015-06-18
|
[
[
"Oxman",
"L. E.",
""
]
] |
We review some recent ideas regarding classical topological objects in dual superconductor models that could represent different confining states of the gluon field. We also comment about natural components in (magnetic) ensembles that could effectively originate these models at large distances.
|
2103.03151
|
Ji-Chong Yang Mr
|
Li Jiang and Yu-Chen Guo and Ji-Chong Yang
|
Detecting anomalous quartic gauge couplings using the isolation forest
machine learning algorithm
|
19 pages, 10 figures
|
Phys. Rev. D 104, 035021 (2021)
|
10.1103/PhysRevD.104.035021
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The search of new physics~(NP) beyond the Standard Model is one of the most
important tasks of high energy physics. A common characteristic of the NP
signals is that they are usually few and kinematically different. We use a
model independent strategy to study the phenomenology of NP by directly picking
out and studying the kinematically unusual events. For this purpose, the
isolation forest~(IF) algorithm is applied, which is found to be efficient in
identifying the signal events of the anomalous quartic gauge couplings~(aQGCs).
The IF algorithm can also be used to constraint the coefficients of aQGCs. As a
machine learning algorithm, the IF algorithm shows a good prospect in the
future studies of NP.
|
[
{
"created": "Thu, 4 Mar 2021 16:45:54 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Aug 2021 20:56:13 GMT",
"version": "v2"
},
{
"created": "Fri, 20 Oct 2023 06:06:26 GMT",
"version": "v3"
}
] |
2023-10-23
|
[
[
"Jiang",
"Li",
""
],
[
"Guo",
"Yu-Chen",
""
],
[
"Yang",
"Ji-Chong",
""
]
] |
The search of new physics~(NP) beyond the Standard Model is one of the most important tasks of high energy physics. A common characteristic of the NP signals is that they are usually few and kinematically different. We use a model independent strategy to study the phenomenology of NP by directly picking out and studying the kinematically unusual events. For this purpose, the isolation forest~(IF) algorithm is applied, which is found to be efficient in identifying the signal events of the anomalous quartic gauge couplings~(aQGCs). The IF algorithm can also be used to constraint the coefficients of aQGCs. As a machine learning algorithm, the IF algorithm shows a good prospect in the future studies of NP.
|
hep-ph/0511222
|
Haibo Li
|
Haibo Li, Maozhi Yang
|
Clean Prediction of \CP violating processes $\psi$, $\phi$ and
$\Upsilon(1S)$ decay to KsKs and KLKL
|
Version 2 is the same as published one at PRL
|
Phys.Rev.Lett. 96 (2006) 192001
|
10.1103/PhysRevLett.96.192001
| null |
hep-ph hep-ex
| null |
The ratio of $K_S K_S$ ($K_L K_L$) and $K_S K_L$ production rates is
calculated by considering $K^0 - K^0bar$ oscillation in $J/\psi \to K^0K^0bar$
decay. The theoretical uncertainty due to strong interaction in $J/\psi$ decay
is completely canceled in the ratio, therefore, the absolute branching
fractions of the \CP violating processes of $J/\psi \to K_S K_S $ and $K_L K_L$
can be cleanly and model-independently determined in case that $J/\psi \to K_S
K_L$ decay is precisely measured. In the future $\tau$-Charm factory, the
expected \CP violating process of $J/\psi \to K_S K_S $ should be reached. It
is important to measure $J/\psi$ to $K_S K_S$ and K_S K_L decays
simultaneously, so that many systematic errors will be canceled. More precise
measurements are suggested to examine the predicted isospin relation in $J/\psi
\to KKbar$ decays. All results can be extended to decays of other vector
quarkonia, $\phi$, $\psi(2S)$ and $\Upsilon(1S)$ and so on.
|
[
{
"created": "Fri, 18 Nov 2005 07:34:11 GMT",
"version": "v1"
},
{
"created": "Fri, 12 May 2006 03:58:56 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Li",
"Haibo",
""
],
[
"Yang",
"Maozhi",
""
]
] |
The ratio of $K_S K_S$ ($K_L K_L$) and $K_S K_L$ production rates is calculated by considering $K^0 - K^0bar$ oscillation in $J/\psi \to K^0K^0bar$ decay. The theoretical uncertainty due to strong interaction in $J/\psi$ decay is completely canceled in the ratio, therefore, the absolute branching fractions of the \CP violating processes of $J/\psi \to K_S K_S $ and $K_L K_L$ can be cleanly and model-independently determined in case that $J/\psi \to K_S K_L$ decay is precisely measured. In the future $\tau$-Charm factory, the expected \CP violating process of $J/\psi \to K_S K_S $ should be reached. It is important to measure $J/\psi$ to $K_S K_S$ and K_S K_L decays simultaneously, so that many systematic errors will be canceled. More precise measurements are suggested to examine the predicted isospin relation in $J/\psi \to KKbar$ decays. All results can be extended to decays of other vector quarkonia, $\phi$, $\psi(2S)$ and $\Upsilon(1S)$ and so on.
|
1110.1479
|
Thuy Nguyen Thi
|
Francis Halzen, Keiji Igi, Muneyuki Ishida, C. S. Kim
|
Total Hadronic Cross Sections and \pi^\mp \pi^+ Scattering
|
Final version to be published in PRD (2012)
| null |
10.1103/PhysRevD.85.074020
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recent measurements of the inelastic and total proton-proton cross section at
the LHC, and at cosmic ray energies by the Auger experiment, have
quantitatively confirmed fits to lower energy data constrained by the
assumption that the proton is asymptotically a black disk of gluons. We show
that data on \bar p(p)p,\pi^\mp p, and K^\mp p forward scattering support the
related expectation that the asymptotic behavior of all cross sections is
flavor independent. By using the most recent measurements from ATLAS, CMS,
TOTEM and Auger, we predict \sigma^{pp}_{\rm tot} (\sqrt s=8 {\rm TeV})=100.6
\pm 2.9 mb and \sigma^{pp}_{\rm tot} (\sqrt s=14 {\rm TeV})=110.8 \pm 3.5 mb,
as well as refine the total cross section \sigma^{pp}_{\rm tot} (\sqrt s=57
{\rm TeV})=139.6 \pm 5.4 mb. Our analysis also predicts the total \pi^\mp \pi^+
cross sections as a function of \sqrt s.
|
[
{
"created": "Fri, 7 Oct 2011 10:37:43 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Apr 2012 06:55:01 GMT",
"version": "v2"
}
] |
2015-05-30
|
[
[
"Halzen",
"Francis",
""
],
[
"Igi",
"Keiji",
""
],
[
"Ishida",
"Muneyuki",
""
],
[
"Kim",
"C. S.",
""
]
] |
Recent measurements of the inelastic and total proton-proton cross section at the LHC, and at cosmic ray energies by the Auger experiment, have quantitatively confirmed fits to lower energy data constrained by the assumption that the proton is asymptotically a black disk of gluons. We show that data on \bar p(p)p,\pi^\mp p, and K^\mp p forward scattering support the related expectation that the asymptotic behavior of all cross sections is flavor independent. By using the most recent measurements from ATLAS, CMS, TOTEM and Auger, we predict \sigma^{pp}_{\rm tot} (\sqrt s=8 {\rm TeV})=100.6 \pm 2.9 mb and \sigma^{pp}_{\rm tot} (\sqrt s=14 {\rm TeV})=110.8 \pm 3.5 mb, as well as refine the total cross section \sigma^{pp}_{\rm tot} (\sqrt s=57 {\rm TeV})=139.6 \pm 5.4 mb. Our analysis also predicts the total \pi^\mp \pi^+ cross sections as a function of \sqrt s.
|
2406.20073
|
Adiba Shaikh
|
Adiba Shaikh, Ranjita K. Mohapatra, Saumen Datta
|
QCD Phase Diagram and the Finite Volume Fireball: A Model Study
| null | null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Experimental investigations of the phase diagram of strongly interacting
matter involve collisions of heavy ions at ultrarelativistic velocities. The
medium created in such a collision is often of dimensions a few fermi, in
particular in the Beam Energy Scan experiments. An understanding of the effect
of the finite volume and the boundary is important for connecting the
experimental results to the phase diagram.
Using the Nambu Jona-Lasinio model, an effective theory for the chiral
transition of quantum chromodynamics (QCD), we have studied the effect of the
finite volume of the fireball on the transition line at finite temperature and
density using the MIT boundary condition to mimic the condition that the system
is deconfined inside. The shift of the transition temperature for finite volume
and finite volume effect on number density and its susceptibilities are
studied. The volume effects should be considered when looking for signatures of
the phase diagram in experiments.
|
[
{
"created": "Fri, 28 Jun 2024 17:32:57 GMT",
"version": "v1"
}
] |
2024-07-01
|
[
[
"Shaikh",
"Adiba",
""
],
[
"Mohapatra",
"Ranjita K.",
""
],
[
"Datta",
"Saumen",
""
]
] |
Experimental investigations of the phase diagram of strongly interacting matter involve collisions of heavy ions at ultrarelativistic velocities. The medium created in such a collision is often of dimensions a few fermi, in particular in the Beam Energy Scan experiments. An understanding of the effect of the finite volume and the boundary is important for connecting the experimental results to the phase diagram. Using the Nambu Jona-Lasinio model, an effective theory for the chiral transition of quantum chromodynamics (QCD), we have studied the effect of the finite volume of the fireball on the transition line at finite temperature and density using the MIT boundary condition to mimic the condition that the system is deconfined inside. The shift of the transition temperature for finite volume and finite volume effect on number density and its susceptibilities are studied. The volume effects should be considered when looking for signatures of the phase diagram in experiments.
|
0707.0429
|
Sean McReynolds
|
Sean McReynolds
|
The Axion from Five-Dimensional Supergravity
|
11 pages
| null | null | null |
hep-ph
| null |
We consider the axion arising from five-dimensional supergravity in the
presence of boundaries. We find the approximate bosonic effective action to
estimate the lower bound on the "Peccei-Quinn" energy scale with a flat bulk.
With a warped bulk, one can obtain a scale within the standard window; this
puts a bound on the required curvature scale relative to the proper separation
between boundaries. We comment on the scalar potential that may ruin the
strong-CP resolution, and the effective derivative coupling to matter in 5D
hypermultiplets.
|
[
{
"created": "Tue, 3 Jul 2007 14:53:22 GMT",
"version": "v1"
}
] |
2007-07-04
|
[
[
"McReynolds",
"Sean",
""
]
] |
We consider the axion arising from five-dimensional supergravity in the presence of boundaries. We find the approximate bosonic effective action to estimate the lower bound on the "Peccei-Quinn" energy scale with a flat bulk. With a warped bulk, one can obtain a scale within the standard window; this puts a bound on the required curvature scale relative to the proper separation between boundaries. We comment on the scalar potential that may ruin the strong-CP resolution, and the effective derivative coupling to matter in 5D hypermultiplets.
|
2205.10149
|
Yu Watanabe
|
Tobias Binder, Sreemanti Chakraborti, Shigeki Matsumoto and Yu
Watanabe
|
A Global Analysis of Resonance-enhanced Light Scalar Dark Matter
|
30 pages, 8 figures
| null |
10.1007/JHEP01(2023)106
|
LAPTH-029/22
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study a minimal model for a light scalar dark matter, requiring a light
scalar mediator to address the core-cusp problem and interact with the standard
model particles. We analyze the model comprehensively by focusing on the
Breit-Wigner resonance for dark matter annihilation and self-scattering
channels, considering the thermal relic abundance condition that includes the
early kinetic decoupling effect, as well as the present and future constraints
from collider, direct, and indirect dark matter detections. We found that the
scalar dark matter with the mass of 0.3-2 GeV remains uncharted, which will be
efficiently tested by the near future MeV gamma-ray observations.
|
[
{
"created": "Fri, 20 May 2022 12:47:10 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Jan 2023 03:57:45 GMT",
"version": "v2"
}
] |
2023-02-08
|
[
[
"Binder",
"Tobias",
""
],
[
"Chakraborti",
"Sreemanti",
""
],
[
"Matsumoto",
"Shigeki",
""
],
[
"Watanabe",
"Yu",
""
]
] |
We study a minimal model for a light scalar dark matter, requiring a light scalar mediator to address the core-cusp problem and interact with the standard model particles. We analyze the model comprehensively by focusing on the Breit-Wigner resonance for dark matter annihilation and self-scattering channels, considering the thermal relic abundance condition that includes the early kinetic decoupling effect, as well as the present and future constraints from collider, direct, and indirect dark matter detections. We found that the scalar dark matter with the mass of 0.3-2 GeV remains uncharted, which will be efficiently tested by the near future MeV gamma-ray observations.
|
hep-ph/0507159
|
Ayres Freitas
|
A. Freitas, M. Awramik, M. Czakon
|
Indirect Determination of the Higgs Mass Through Electroweak Radiative
Corrections
|
to appear in Proc. of the International Linear Collider Workshop
(LCWS 05), Stanford, California, USA, 18-22 Mar 2005
|
ECONFC050318:0610,2005
| null |
FERMILAB-Conf-05-318-T, DESY 05-122, WUE-ITP-2005-007
|
hep-ph
| null |
Electroweak precision observables allow stringent tests of the Standard Model
at the quantum level and imply interesting bounds on the mass of the Higgs
boson through higher-order loop effects. Very significant constraints come
especially from the determination of the mass of the W boson and from the
effective leptonic weak mixing angle. After shortly reviewing the status of
theoretical computations of the W mass, the new calculation of two-loop
corrections with closed fermion loops to the effective leptonic weak mixing
angle is discussed in detail. The phenomenological implications of the new
result are analyzed including an estimate of remaining uncertainties.
|
[
{
"created": "Wed, 13 Jul 2005 16:28:48 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Freitas",
"A.",
""
],
[
"Awramik",
"M.",
""
],
[
"Czakon",
"M.",
""
]
] |
Electroweak precision observables allow stringent tests of the Standard Model at the quantum level and imply interesting bounds on the mass of the Higgs boson through higher-order loop effects. Very significant constraints come especially from the determination of the mass of the W boson and from the effective leptonic weak mixing angle. After shortly reviewing the status of theoretical computations of the W mass, the new calculation of two-loop corrections with closed fermion loops to the effective leptonic weak mixing angle is discussed in detail. The phenomenological implications of the new result are analyzed including an estimate of remaining uncertainties.
|
1809.06612
|
Mina Ketan Parida
|
M. K. Parida (SOADU), Rajesh Satpathy (SOADU)
|
High Scale Type-II Seesaw, Dominant Double Beta Decay within
Cosmological Bound and Verifiable LFV Decays in SU(5)
|
37 pages, LaTeX, 9 figures; accepted version by Advances in High
Energy Physics
|
Adv. High Energy Phys. 2019 (2019) 3572862
|
10.1155/2019/3572862
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Very recently a novel implementation of type-II seesaw mechanism for neutrino
mass has been proposed in SU(5) grand unified theory with a number of desirable
new physical phenomena beyond the standard model.Introducing heavy right-haded
neutrinos and extra fermion singlets, in this work we show how the type-I seeaw
cancellation mechanism works in this SU(5) framework. Besides predicting
verifiable LFV decays, we further show that the model predicts dominant double
beta decay with normal hierarchy or inverted hierarchy of active light neutrino
masses in concordance with cosmological bound. In addition, a novel mechanism
for heavy right-handed neutrino mass generation independent of type-II seesaw
predicted mass hierarchy, is suggested in this work.
|
[
{
"created": "Tue, 18 Sep 2018 09:32:50 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Dec 2018 12:13:52 GMT",
"version": "v2"
}
] |
2019-02-05
|
[
[
"Parida",
"M. K.",
"",
"SOADU"
],
[
"Satpathy",
"Rajesh",
"",
"SOADU"
]
] |
Very recently a novel implementation of type-II seesaw mechanism for neutrino mass has been proposed in SU(5) grand unified theory with a number of desirable new physical phenomena beyond the standard model.Introducing heavy right-haded neutrinos and extra fermion singlets, in this work we show how the type-I seeaw cancellation mechanism works in this SU(5) framework. Besides predicting verifiable LFV decays, we further show that the model predicts dominant double beta decay with normal hierarchy or inverted hierarchy of active light neutrino masses in concordance with cosmological bound. In addition, a novel mechanism for heavy right-handed neutrino mass generation independent of type-II seesaw predicted mass hierarchy, is suggested in this work.
|
2212.12565
|
Stephen Parke
|
Asli Abdullahi and Stephen J. Parke
|
Neutrino Oscillations in Matter using the Adjugate of the Hamiltonian
|
34 pages. This is the published version of this paper
| null | null |
FERMILAB-Pub-22-922-T
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We revisit neutrino oscillations in constant matter density for a number of
different scenarios: three flavors with the standard Wolfenstein matter
potential, four flavors with standard matter potential and three flavors with
non-standard matter potentials. To calculate the oscillation probabilities for
these scenarios one must determine the eigenvalues and eigenvectors of the
Hamiltonians. We use a method for calculating the eigenvalues that is well
known, determination of the zeros of determinant of matrix $(\lambda I -H)$,
where H is the Hamiltonian, I the identity matrix and $\lambda$ is a scalar. To
calculate the associated eigenvectors we use a method that is little known in
the particle physics community, the calculation of the adjugate (transpose of
the cofactor matrix) of the same matrix, $(\lambda I -H)$. This method can be
applied to any Hamiltonian, but provides a very simple way to determine the
eigenvectors for neutrino oscillation in matter, independent of the complexity
of the matter potential. This method can be trivially automated using the
Faddeev-LeVerrier algorithm for numerical calculations. For the above scenarios
we derive a number of quantities that are invariant of the matter potential,
many are new such as the generalization of the Naumov-Harrison-Scott identity
for four or more flavors of neutrinos. We also show how these matter potential
independent quantities become matter potential dependent when off-diagonal
non-standard matter effects are included.
|
[
{
"created": "Fri, 23 Dec 2022 19:42:09 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Sep 2023 21:15:20 GMT",
"version": "v2"
}
] |
2023-09-29
|
[
[
"Abdullahi",
"Asli",
""
],
[
"Parke",
"Stephen J.",
""
]
] |
We revisit neutrino oscillations in constant matter density for a number of different scenarios: three flavors with the standard Wolfenstein matter potential, four flavors with standard matter potential and three flavors with non-standard matter potentials. To calculate the oscillation probabilities for these scenarios one must determine the eigenvalues and eigenvectors of the Hamiltonians. We use a method for calculating the eigenvalues that is well known, determination of the zeros of determinant of matrix $(\lambda I -H)$, where H is the Hamiltonian, I the identity matrix and $\lambda$ is a scalar. To calculate the associated eigenvectors we use a method that is little known in the particle physics community, the calculation of the adjugate (transpose of the cofactor matrix) of the same matrix, $(\lambda I -H)$. This method can be applied to any Hamiltonian, but provides a very simple way to determine the eigenvectors for neutrino oscillation in matter, independent of the complexity of the matter potential. This method can be trivially automated using the Faddeev-LeVerrier algorithm for numerical calculations. For the above scenarios we derive a number of quantities that are invariant of the matter potential, many are new such as the generalization of the Naumov-Harrison-Scott identity for four or more flavors of neutrinos. We also show how these matter potential independent quantities become matter potential dependent when off-diagonal non-standard matter effects are included.
|
hep-ph/0003312
|
Lorenzo Sorbo
|
A. Masiero, M. Peloso, L. Sorbo, R. Tabbash
|
Baryogenesis vs. proton stability in theories with extra dimensions
|
10 pages, 1 figure
|
Phys.Rev.D62:063515,2000
|
10.1103/PhysRevD.62.063515
| null |
hep-ph astro-ph
| null |
We propose a new scenario of baryogenesis in the context of theories with
large extra dimensions. The baryon number is almost conserved at zero
temperature by means of a localization mechanism recently analyzed by
Arkani-Hamed and Schmaltz: leptons and quarks are located at two slightly
displaced positions in the extra space, and this naturally suppresses the
interactions which ``convert'' the latter in the former. We show that this is
expected to be no longer true when finite temperature effects are taken into
account. The whole scenario is first presented in its generality, without
referring to the bulk geometry or to the specific mechanism which may generate
the baryon asymmetry. As an example, we then focus on a baryogenesis model
reminiscent of GUT baryogenesis. The Sakharov out of equilibrium condition is
satisfied by assuming nonthermal production of the bosons that induce baryon
number violation.
|
[
{
"created": "Fri, 31 Mar 2000 09:27:55 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Masiero",
"A.",
""
],
[
"Peloso",
"M.",
""
],
[
"Sorbo",
"L.",
""
],
[
"Tabbash",
"R.",
""
]
] |
We propose a new scenario of baryogenesis in the context of theories with large extra dimensions. The baryon number is almost conserved at zero temperature by means of a localization mechanism recently analyzed by Arkani-Hamed and Schmaltz: leptons and quarks are located at two slightly displaced positions in the extra space, and this naturally suppresses the interactions which ``convert'' the latter in the former. We show that this is expected to be no longer true when finite temperature effects are taken into account. The whole scenario is first presented in its generality, without referring to the bulk geometry or to the specific mechanism which may generate the baryon asymmetry. As an example, we then focus on a baryogenesis model reminiscent of GUT baryogenesis. The Sakharov out of equilibrium condition is satisfied by assuming nonthermal production of the bosons that induce baryon number violation.
|
1805.10145
|
Alexey Kiselev
|
N.N. Achasov, A.V. Kiselev
|
The $a_0(980)$ physics in semileptonic $D^0$ and $D^+$ decays
|
16 pages, 9 figures. Updated version corresponding to PRD article. An
essential upgrade, including taking into account the KLOE-2009 data on the
phi-> eta pi0 gamma decay. arXiv admin note: text overlap with
arXiv:1711.08777
|
Phys. Rev. D 98, 096009 (2018)
|
10.1103/PhysRevD.98.096009
| null |
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The decays $D^0\to d\bar u\,e^+\nu\to a^-_0(980)\, e^+\nu\to\pi^-\eta\,
e^+\nu$ and $D^+\to d\bar d\,e^+\nu\to a^0_0(980)\, e^+\nu\to\pi^0\eta\,
e^+\nu$ (and the charge conjugated ones) is the direct probe of the two-quark
components in the $a^\pm_0(980)$ and $a^0_0(980)$ wave functions. Recent BESIII
experiment is the first step in experimental study of these decays. We present
a possible variant of $\eta\pi$ invariant mass distribution when $a_0(980)$ has
no $q\bar q$ component at all.
|
[
{
"created": "Thu, 24 May 2018 16:18:41 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Nov 2018 14:35:18 GMT",
"version": "v2"
}
] |
2018-11-29
|
[
[
"Achasov",
"N. N.",
""
],
[
"Kiselev",
"A. V.",
""
]
] |
The decays $D^0\to d\bar u\,e^+\nu\to a^-_0(980)\, e^+\nu\to\pi^-\eta\, e^+\nu$ and $D^+\to d\bar d\,e^+\nu\to a^0_0(980)\, e^+\nu\to\pi^0\eta\, e^+\nu$ (and the charge conjugated ones) is the direct probe of the two-quark components in the $a^\pm_0(980)$ and $a^0_0(980)$ wave functions. Recent BESIII experiment is the first step in experimental study of these decays. We present a possible variant of $\eta\pi$ invariant mass distribution when $a_0(980)$ has no $q\bar q$ component at all.
|
hep-ph/9503224
| null |
F.S. Navarra, C.A.A. Nunes
|
Temperature dependence of heavy meson masses
|
Revised version to appear in Phys.Lett.B
|
Phys.Lett.B356:439-444,1995
|
10.1016/0370-2693(95)00836-A
| null |
hep-ph
| null |
Using a previously derived QCD effective hamiltonian we find the masses of
heavy quarkonia states. Non perturbative effects are included through
temperature dependent gluonic condensates. We find that even a moderate change
in these condensates in a hot hadronic environment (below the deconfining
transition) is sufficient to significantly change the heavy meson masses.
|
[
{
"created": "Fri, 3 Mar 1995 10:10:57 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Aug 1995 16:49:20 GMT",
"version": "v2"
}
] |
2010-11-01
|
[
[
"Navarra",
"F. S.",
""
],
[
"Nunes",
"C. A. A.",
""
]
] |
Using a previously derived QCD effective hamiltonian we find the masses of heavy quarkonia states. Non perturbative effects are included through temperature dependent gluonic condensates. We find that even a moderate change in these condensates in a hot hadronic environment (below the deconfining transition) is sufficient to significantly change the heavy meson masses.
|
1207.0735
|
Shinya Matsuzaki
|
Junji Jia, Shinya Matsuzaki and Koichi Yamawaki
|
Walking techni-pions at LHC
|
17 pages, 8 eps figures, latex; typos corrected
|
Physical Review D87 016006 (2013)
|
10.1103/PhysRevD.87.016006
|
MISC-2012-11
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate techni-pion masses of the walking technicolor (WTC), by
explicitly evaluating nontrivial contributions from various possible chiral
breaking sources in a concrete WTC setting of the one-family model. Our
explicit computation of the mass and the coupling in this concrete model
setting reveals that the techni-pions are on the order of several hundred GeV
in the region to be discovered at LHC.
|
[
{
"created": "Tue, 3 Jul 2012 16:10:05 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Jan 2013 05:10:32 GMT",
"version": "v2"
}
] |
2013-01-11
|
[
[
"Jia",
"Junji",
""
],
[
"Matsuzaki",
"Shinya",
""
],
[
"Yamawaki",
"Koichi",
""
]
] |
We calculate techni-pion masses of the walking technicolor (WTC), by explicitly evaluating nontrivial contributions from various possible chiral breaking sources in a concrete WTC setting of the one-family model. Our explicit computation of the mass and the coupling in this concrete model setting reveals that the techni-pions are on the order of several hundred GeV in the region to be discovered at LHC.
|
hep-ph/0002139
|
Wolfgang Lucha
|
Wolfgang Lucha and F. F. Schoberl
|
Numerical Solution of the Spinless Salpeter Equation by a Semianalytical
Matrix Method (a Mathematica 4.0 routine)
|
7 pages, LaTeX
|
Int.J.Mod.Phys. C11 (2000) 485-492
|
10.1142/S0129183100000419
|
HEPHY-PUB 728/00
|
hep-ph nucl-th physics.comp-ph
| null |
In quantum theory, the so-called "spinless Salpeter equation," the
relativistic generalization of the nonrelativistic Schroedinger equation, is
used to describe both bound states of scalar particles and the spin-averaged
spectra of bound states of fermions. A numerical procedure solves the spinless
Salpeter equation by approximating this eigenvalue equation by a matrix
eigenvalue problem with explicitly known matrices.
|
[
{
"created": "Mon, 14 Feb 2000 09:26:54 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Lucha",
"Wolfgang",
""
],
[
"Schoberl",
"F. F.",
""
]
] |
In quantum theory, the so-called "spinless Salpeter equation," the relativistic generalization of the nonrelativistic Schroedinger equation, is used to describe both bound states of scalar particles and the spin-averaged spectra of bound states of fermions. A numerical procedure solves the spinless Salpeter equation by approximating this eigenvalue equation by a matrix eigenvalue problem with explicitly known matrices.
|
2007.02263
|
Xiang Liu
|
Jun-Zhang Wang, Dian-Yong Chen, Xiang Liu and Takayuki Matsuki
|
Universal non-resonant explanation to charmoniumlike structures
$Z_c(3885)$ and $Z_c(4025)$
|
5 pages, 4 figures and 1 table. Accepted by Eur. Phys. J. C
|
Eur.Phys.J. C 80, 1040 (2020)
|
10.1140/epjc/s10052-020-08621-4
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Different from the usual tetraquark assignment to charged $Z_c(3885)$ and
$Z_c(4025)$ charmoniumlike structures, in this letter we propose a universal
non-resonant explanation to decode these $Z_c$'s, which is based on a special
dynamical behavior of $e^+e^-\to D^{(*)}\bar{D}^*\pi$. Our study shows that
$Z_c(3885)$ and $Z_c(4025)$ are only the reflection from the $P$-wave charmed
meson $D_1(2420)$ involved in $e^+e^-\to D^{(*)}\bar{D}^*\pi$. Obviously, the
present work provides a unique perspective, which can be examined by future
experiments like BESIII and BelleII.
|
[
{
"created": "Sun, 5 Jul 2020 08:12:20 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Jul 2020 12:45:08 GMT",
"version": "v2"
},
{
"created": "Mon, 2 Nov 2020 13:10:16 GMT",
"version": "v3"
}
] |
2020-11-16
|
[
[
"Wang",
"Jun-Zhang",
""
],
[
"Chen",
"Dian-Yong",
""
],
[
"Liu",
"Xiang",
""
],
[
"Matsuki",
"Takayuki",
""
]
] |
Different from the usual tetraquark assignment to charged $Z_c(3885)$ and $Z_c(4025)$ charmoniumlike structures, in this letter we propose a universal non-resonant explanation to decode these $Z_c$'s, which is based on a special dynamical behavior of $e^+e^-\to D^{(*)}\bar{D}^*\pi$. Our study shows that $Z_c(3885)$ and $Z_c(4025)$ are only the reflection from the $P$-wave charmed meson $D_1(2420)$ involved in $e^+e^-\to D^{(*)}\bar{D}^*\pi$. Obviously, the present work provides a unique perspective, which can be examined by future experiments like BESIII and BelleII.
|
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