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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1811.00315
|
Renata Jora
|
Renata Jora
|
Note on the gluino condensate in supersymmetric Yang Mills theory
|
2 pages
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate gluino condensate for supersymmetric Yang Mills theory on
general grounds without making any assumption with regard to the weak or strong
regime of the theory. Our result coincides with that obtained from an instanton
superpotential when the theory is weakly interacting. The method also
determines the corresponding partition function.
|
[
{
"created": "Thu, 1 Nov 2018 11:11:56 GMT",
"version": "v1"
}
] |
2018-11-02
|
[
[
"Jora",
"Renata",
""
]
] |
We calculate gluino condensate for supersymmetric Yang Mills theory on general grounds without making any assumption with regard to the weak or strong regime of the theory. Our result coincides with that obtained from an instanton superpotential when the theory is weakly interacting. The method also determines the corresponding partition function.
|
hep-ph/9909430
|
Roland E. Allen
|
Roland E. Allen
|
New Physics Near 1 TeV and Above
|
13 pages, LaTeX; to be published in the Proceedings of "Beyond the
Desert '99" (Castle Ringberg, Germany, June 6 - 12, 1999), edited by H.V.
Klapdor-Kleingrothaus. Very minor corrections in revised version
| null | null | null |
hep-ph astro-ph hep-ex hep-th
| null |
A new theory makes testable predictions: (1) Higgs fields have an
unconventional equation of motion. (2) Fermions have a second-order coupling to
gauge fields. (3) Fermion propagators are modified at high energy. (4) There
are new scalar bosons which are supersymmetric partners of spin 1/2 fermions.
(5) Since W-bosons gravitate differently from fermions and massless gauge
bosons, there is a very small violation of the equivalence principle. Other
features of the theory have implications for cosmology, including the values of
cosmological parameters, a mechanism for scale-invariant density fluctuations,
and a candidate for dark matter.
|
[
{
"created": "Mon, 20 Sep 1999 16:27:00 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Oct 1999 23:48:32 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Allen",
"Roland E.",
""
]
] |
A new theory makes testable predictions: (1) Higgs fields have an unconventional equation of motion. (2) Fermions have a second-order coupling to gauge fields. (3) Fermion propagators are modified at high energy. (4) There are new scalar bosons which are supersymmetric partners of spin 1/2 fermions. (5) Since W-bosons gravitate differently from fermions and massless gauge bosons, there is a very small violation of the equivalence principle. Other features of the theory have implications for cosmology, including the values of cosmological parameters, a mechanism for scale-invariant density fluctuations, and a candidate for dark matter.
|
2004.01159
|
David Blaschke
|
D. Blaschke, A.V. Friesen, Yu.B. Ivanov, Yu.L. Kalinovsky, M.
Kozhevnikova, S. Liebing, A. Radzhabov, G. R\"opke
|
QCD Phase Diagram at NICA energies: $K^+/\pi^+$ horn effect and light
clusters in THESEUS
|
5 pages, 3 figures, 3 references added, contribution to the
Proceedings of "III NICA Days-2019 and IV MPD Collaboration Meeting", Warsaw,
21.-25.10.2019
|
Acta Phys.Polon.Supp. 14 (2021) 3, 485-489
|
10.5506/APhysPolBSupp.14.485
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss recent progress in the development of the three-fluid
hydrodynamics-based program THESEUS towards an event generator suitable for
applications to heavy-ion collisions at the intermediate energies of the
planned NICA and FAIR experiments. We follow the strategy that modifications of
particle distributions at the freeze-out surface in the QCD phase diagram may
be mapped directly to the observable ones within a sudden freeze-out scheme. We
report first results of these investigations for the production of light
clusters (deuterons and tritons) which can be compared to experimental data
from the HADES and the NA49 experiment and for the interpretation of the "horn"
effect observed in the collision energy dependence of the $K^+/\pi^+$ ratio.
Medium effects on light cluster production in the QCD phase diagram are
negligible at the highest NICA energies but shall play a dominant role at the
lowest energies. A sharp "horn"-type signal in the $K^+/\pi^+$ ratio can be
obtained when the onset of Bose condensation modelled by a pion chemical
potential results in an enhancement of pions at low momenta (which is seen at
LHC energies) and would occur already in the NICA energy range.
|
[
{
"created": "Thu, 2 Apr 2020 17:32:08 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Apr 2020 18:22:32 GMT",
"version": "v2"
}
] |
2024-08-06
|
[
[
"Blaschke",
"D.",
""
],
[
"Friesen",
"A. V.",
""
],
[
"Ivanov",
"Yu. B.",
""
],
[
"Kalinovsky",
"Yu. L.",
""
],
[
"Kozhevnikova",
"M.",
""
],
[
"Liebing",
"S.",
""
],
[
"Radzhabov",
"A.",
""
],
[
"Röpke",
"G.",
""
]
] |
We discuss recent progress in the development of the three-fluid hydrodynamics-based program THESEUS towards an event generator suitable for applications to heavy-ion collisions at the intermediate energies of the planned NICA and FAIR experiments. We follow the strategy that modifications of particle distributions at the freeze-out surface in the QCD phase diagram may be mapped directly to the observable ones within a sudden freeze-out scheme. We report first results of these investigations for the production of light clusters (deuterons and tritons) which can be compared to experimental data from the HADES and the NA49 experiment and for the interpretation of the "horn" effect observed in the collision energy dependence of the $K^+/\pi^+$ ratio. Medium effects on light cluster production in the QCD phase diagram are negligible at the highest NICA energies but shall play a dominant role at the lowest energies. A sharp "horn"-type signal in the $K^+/\pi^+$ ratio can be obtained when the onset of Bose condensation modelled by a pion chemical potential results in an enhancement of pions at low momenta (which is seen at LHC energies) and would occur already in the NICA energy range.
|
1005.4451
|
Nikolaos Kidonakis
|
Nikolaos Kidonakis
|
Two-loop soft anomalous dimensions for single top quark associated
production with a W- or H-
|
18 pages, 11 figures
|
Phys.Rev.D82:054018,2010
|
10.1103/PhysRevD.82.054018
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I present results for the two-loop soft anomalous dimensions for associated
production of a single top quark with a W boson or a charged Higgs boson. The
calculation uses expressions for the massive cusp anomalous dimension, which
are presented in different forms, and it allows soft-gluon resummation at
next-to-next-to-leading-logarithm (NNLL) accuracy. From the NNLL resummed cross
section I derive approximate NNLO cross sections for bg -> tW- and bg -> tH- at
LHC energies of 7, 10, and 14 TeV.
|
[
{
"created": "Mon, 24 May 2010 23:07:39 GMT",
"version": "v1"
}
] |
2011-01-06
|
[
[
"Kidonakis",
"Nikolaos",
""
]
] |
I present results for the two-loop soft anomalous dimensions for associated production of a single top quark with a W boson or a charged Higgs boson. The calculation uses expressions for the massive cusp anomalous dimension, which are presented in different forms, and it allows soft-gluon resummation at next-to-next-to-leading-logarithm (NNLL) accuracy. From the NNLL resummed cross section I derive approximate NNLO cross sections for bg -> tW- and bg -> tH- at LHC energies of 7, 10, and 14 TeV.
|
1804.01477
|
Mauro Chiesa
|
Mauro Chiesa, Ansgar Denner, Jean-Nicolas Lang
|
Anomalous triple-gauge-boson interactions in vector-boson pair
production with RECOLA2
|
36 pages, 56 pdf figures, latex. Corrected typo in Eq.(3.2). One
reference added. Published version
|
Eur.Phys.J. C78 (2018) no.6, 467
|
10.1140/epjc/s10052-018-5949-z
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Diboson production at the LHC is a process of great importance both in the
context of tests of the SM and for direct searches for new physics. In this
paper we present a phenomenological study of WW, WZ, and ZZ production
considering event selections of interest for the anomalous
triple-gauge-boson-coupling searches at the LHC: we provide theoretical
predictions within the Standard Model at NLO QCD and NLO EW accuracy and study
the effect of the anomalous triple-gauge-boson interactions at NLO QCD. For WW
and ZZ production, the contribution of the gluon-initiated loop-induced
processes is included. Anomalous triple-gauge-boson interactions are
parametrized in the EFT framework. This paper is the first application of
RECOLA2 in the EFT context.
|
[
{
"created": "Wed, 4 Apr 2018 15:45:16 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Jul 2018 08:57:17 GMT",
"version": "v2"
}
] |
2018-07-05
|
[
[
"Chiesa",
"Mauro",
""
],
[
"Denner",
"Ansgar",
""
],
[
"Lang",
"Jean-Nicolas",
""
]
] |
Diboson production at the LHC is a process of great importance both in the context of tests of the SM and for direct searches for new physics. In this paper we present a phenomenological study of WW, WZ, and ZZ production considering event selections of interest for the anomalous triple-gauge-boson-coupling searches at the LHC: we provide theoretical predictions within the Standard Model at NLO QCD and NLO EW accuracy and study the effect of the anomalous triple-gauge-boson interactions at NLO QCD. For WW and ZZ production, the contribution of the gluon-initiated loop-induced processes is included. Anomalous triple-gauge-boson interactions are parametrized in the EFT framework. This paper is the first application of RECOLA2 in the EFT context.
|
hep-ph/9805416
|
Ruben Flores
|
Ruben Flores-Mendieta, Elizabeth Jenkins, and Aneesh V. Manohar
|
SU(3) symmetry breaking in hyperon semileptonic decays
|
18 pages (revtex). Discussion of theory errors added. Two redundant
parameters for symmetry breaking in f1 deleted. Central values for the fits
remain unchanged, but some of the errors are modified
|
Phys.Rev.D58:094028,1998
|
10.1103/PhysRevD.58.094028
|
UCSD-PTH-98-17
|
hep-ph
| null |
Flavor SU(3) symmetry breaking in the hyperon semileptonic decay form-factors
is analyzed using the 1/N expansion. A detailed comparison with experimental
data shows that corrections to f_1 are approximately 10%, which agrees with
theoretical expectations. Corrections to g_1 are compatible with first-order
symmetry breaking. A fit to the experimental data allows one to predict the g_1
form factor for Xi^0 -> Sigma^+ decay. The proton matrix element of the T^8
component of the axial current (which is equal to 3F-D in the SU(3) symmetry
limit) is found to be approximately 0.34.
|
[
{
"created": "Thu, 21 May 1998 22:22:11 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jul 1998 22:21:54 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Flores-Mendieta",
"Ruben",
""
],
[
"Jenkins",
"Elizabeth",
""
],
[
"Manohar",
"Aneesh V.",
""
]
] |
Flavor SU(3) symmetry breaking in the hyperon semileptonic decay form-factors is analyzed using the 1/N expansion. A detailed comparison with experimental data shows that corrections to f_1 are approximately 10%, which agrees with theoretical expectations. Corrections to g_1 are compatible with first-order symmetry breaking. A fit to the experimental data allows one to predict the g_1 form factor for Xi^0 -> Sigma^+ decay. The proton matrix element of the T^8 component of the axial current (which is equal to 3F-D in the SU(3) symmetry limit) is found to be approximately 0.34.
|
1212.3167
|
Vladimir Galkin
|
R. N. Faustov, V. O. Galkin
|
Weak decays of $B_s$ mesons to $D_s$ mesons in the relativistic quark
model
|
29 pages, 10 figures, version to be published in Physical Review D
| null |
10.1103/PhysRevD.87.034033
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The form factors of weak decays of $B_s$ mesons to ground state $D_s^{(*)}$
mesons as well as to their radial $D_s^{(*)}(2S)$ and orbital $D_{sJ}^{(*)}$
excitations are calculated in the framework of the relativistic quark model
based on the quasipotential approach. All relativistic effects, including
contributions of intermediate negative-energy states and boosts of the meson
wave functions, are consistently taken into account. As a result the form
factors are determined in the whole kinematical range without additional
phenomenological parametrizations and extrapolations. On this basis
semileptonic decay branching fractions are calculated. Two-body nonleptonic
$B_s$ decays are considered within the factorization approximation. The
obtained results agree well with available experimental data.
|
[
{
"created": "Thu, 13 Dec 2012 13:32:22 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Feb 2013 08:46:49 GMT",
"version": "v2"
}
] |
2013-03-14
|
[
[
"Faustov",
"R. N.",
""
],
[
"Galkin",
"V. O.",
""
]
] |
The form factors of weak decays of $B_s$ mesons to ground state $D_s^{(*)}$ mesons as well as to their radial $D_s^{(*)}(2S)$ and orbital $D_{sJ}^{(*)}$ excitations are calculated in the framework of the relativistic quark model based on the quasipotential approach. All relativistic effects, including contributions of intermediate negative-energy states and boosts of the meson wave functions, are consistently taken into account. As a result the form factors are determined in the whole kinematical range without additional phenomenological parametrizations and extrapolations. On this basis semileptonic decay branching fractions are calculated. Two-body nonleptonic $B_s$ decays are considered within the factorization approximation. The obtained results agree well with available experimental data.
|
1601.02649
|
Christopher Wever
|
Hjalte Frellesvig, Damiano Tommasini and Christopher Wever
|
On the reduction of generalized polylogarithms to $\text{Li}_n$ and
$\text{Li}_{2,2}$ and on the evaluation thereof
|
35 pages, 4 figures. Ancillary files are attached. Published version
with small typos fixed and an extra formula added in App A
| null |
10.1007/JHEP03(2016)189
|
TTP16-002
|
hep-ph hep-th math.NA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We give expressions for all generalized polylogarithms up to weight four in
terms of the functions log, $\text{Li}_n$, and $\text{Li}_{2,2}$, valid for
arbitrary complex variables. Furthermore we provide algorithms for manipulation
and numerical evaluation of $\text{Li}_n$ and $\text{Li}_{2,2}$, and add codes
in Mathematica and C++ implementing the results. With these results we
calculate a number of previously unknown integrals, which we add in App. C.
|
[
{
"created": "Mon, 11 Jan 2016 21:18:47 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Feb 2016 15:31:17 GMT",
"version": "v2"
},
{
"created": "Wed, 1 Jun 2016 18:11:25 GMT",
"version": "v3"
}
] |
2016-06-02
|
[
[
"Frellesvig",
"Hjalte",
""
],
[
"Tommasini",
"Damiano",
""
],
[
"Wever",
"Christopher",
""
]
] |
We give expressions for all generalized polylogarithms up to weight four in terms of the functions log, $\text{Li}_n$, and $\text{Li}_{2,2}$, valid for arbitrary complex variables. Furthermore we provide algorithms for manipulation and numerical evaluation of $\text{Li}_n$ and $\text{Li}_{2,2}$, and add codes in Mathematica and C++ implementing the results. With these results we calculate a number of previously unknown integrals, which we add in App. C.
|
hep-ph/0308177
|
Jambul Gegelia
|
T. Fuchs, J. Gegelia, G. Japaridze, and S. Scherer
|
Power counting in relativistic baryon chiral perturbation theory
|
3 pages, 1 figure. Contribution to the 17th International IUPAP
Conference on Few-body Problems in Physics, June 5-10, 2003 Durham, North
Carolina, USA
| null | null |
MKPH-T-03-12
|
hep-ph nucl-th
| null |
We consider a renormalization scheme for relativistic baryon chiral
perturbation theory which provides a simple and consistent power counting for
renormalized diagrams. As an application we discuss the chiral expansion of the
nucleon mass.
|
[
{
"created": "Mon, 18 Aug 2003 14:28:13 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Fuchs",
"T.",
""
],
[
"Gegelia",
"J.",
""
],
[
"Japaridze",
"G.",
""
],
[
"Scherer",
"S.",
""
]
] |
We consider a renormalization scheme for relativistic baryon chiral perturbation theory which provides a simple and consistent power counting for renormalized diagrams. As an application we discuss the chiral expansion of the nucleon mass.
|
1811.05940
|
Dario Consoli
|
Pascal Anastasopoulos, Panagiotis Betzios, Massimo Bianchi, Dario
Consoli, Elias Kiritsis
|
Emergent/Composite axions
|
42 pages plus appendices, 5 figures
|
J. High Energ. Phys. (2019) 2019: 113
|
10.1007/JHEP10(2019)113
|
CCTP-2018-13, ITCP-2018-10, UWThPh2018-28
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Hidden theories coupled to the SM may provide emergent axions, that are
composites/bound-states of the hidden fields. This is motivated by paradigms
emerging from the AdS/CFT correspondence but it is a more general phenomenon.
We explore the general setup and find that UV-sourced interactions of instanton
densities give rise to emergent axions in the IR. We study the general
properties of such axions and argue that they are generically different from
both fundamental and composite axions that have been studied so far.
|
[
{
"created": "Wed, 14 Nov 2018 18:13:46 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Nov 2018 18:58:28 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Oct 2019 10:07:31 GMT",
"version": "v3"
}
] |
2019-10-22
|
[
[
"Anastasopoulos",
"Pascal",
""
],
[
"Betzios",
"Panagiotis",
""
],
[
"Bianchi",
"Massimo",
""
],
[
"Consoli",
"Dario",
""
],
[
"Kiritsis",
"Elias",
""
]
] |
Hidden theories coupled to the SM may provide emergent axions, that are composites/bound-states of the hidden fields. This is motivated by paradigms emerging from the AdS/CFT correspondence but it is a more general phenomenon. We explore the general setup and find that UV-sourced interactions of instanton densities give rise to emergent axions in the IR. We study the general properties of such axions and argue that they are generically different from both fundamental and composite axions that have been studied so far.
|
2108.00188
|
Kazem Azizi
|
S. S. Agaev, K. Azizi, H. Sundu
|
Newly observed exotic doubly charmed meson $T^{+}_{cc}$
|
8 Pages, 2 Figure and 1 Table
| null |
10.1016/j.nuclphysb.2022.115650
| null |
hep-ph hep-ex hep-lat
|
http://creativecommons.org/licenses/by/4.0/
|
In this work, we treat the newly observed doubly charmed four-quark state $
T_{cc}^{+}$ as an axial-vector tetraquark with content $cc\overline{u}
\overline{d}$, and calculate its spectroscopic parameters and width. The mass
and current coupling of the tetraquark $T_{cc}^{+}$ are found by means of the
QCD two-point sum rule method by taking into account quark, gluon and mixed
condensates up to dimension $10$. The width of the $T_{cc}^{+}$ is evaluated
using partial widths of decay processes $T_{cc}^{+} \to \widetilde{ T}\pi ^{0}$
and $T_{cc}^{+} \to T_{cc;\overline{u}\overline{u}}^{0}\pi ^{+}$ , where
$\widetilde{T}=cc\overline{u}\overline{d}$ and $T_{cc;\overline{u}
\overline{u}}^{0}$ are scalar tetraquarks. To compute the partial width of the
first process, we apply the QCD three-point sum rule approach and extract
numerical value of the strong coupling $g$ that corresponds to the vertex
$T_{cc}^{+}\widetilde{T}\pi ^{0}$. The width of the second decay is estimated
using isospin symmetry and the prediction obtained for the first channel. Our
results for the mass $m=(3868\pm 124)~\mathrm{MeV}$ and width $ \Gamma=(489\pm
92)~\mathrm{keV}$ of the tetraquark $T_{cc}^{+}$ are in a nice agreement with
recent measurements of the LHCb collaboration.
|
[
{
"created": "Sat, 31 Jul 2021 09:20:39 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Aug 2021 12:04:51 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Jan 2022 18:03:43 GMT",
"version": "v3"
}
] |
2022-02-09
|
[
[
"Agaev",
"S. S.",
""
],
[
"Azizi",
"K.",
""
],
[
"Sundu",
"H.",
""
]
] |
In this work, we treat the newly observed doubly charmed four-quark state $ T_{cc}^{+}$ as an axial-vector tetraquark with content $cc\overline{u} \overline{d}$, and calculate its spectroscopic parameters and width. The mass and current coupling of the tetraquark $T_{cc}^{+}$ are found by means of the QCD two-point sum rule method by taking into account quark, gluon and mixed condensates up to dimension $10$. The width of the $T_{cc}^{+}$ is evaluated using partial widths of decay processes $T_{cc}^{+} \to \widetilde{ T}\pi ^{0}$ and $T_{cc}^{+} \to T_{cc;\overline{u}\overline{u}}^{0}\pi ^{+}$ , where $\widetilde{T}=cc\overline{u}\overline{d}$ and $T_{cc;\overline{u} \overline{u}}^{0}$ are scalar tetraquarks. To compute the partial width of the first process, we apply the QCD three-point sum rule approach and extract numerical value of the strong coupling $g$ that corresponds to the vertex $T_{cc}^{+}\widetilde{T}\pi ^{0}$. The width of the second decay is estimated using isospin symmetry and the prediction obtained for the first channel. Our results for the mass $m=(3868\pm 124)~\mathrm{MeV}$ and width $ \Gamma=(489\pm 92)~\mathrm{keV}$ of the tetraquark $T_{cc}^{+}$ are in a nice agreement with recent measurements of the LHCb collaboration.
|
0910.0599
|
Sedigheh Deldar
|
Sedigheh Deldar, Shahnoosh Rafibakhsh (University of Tehran)
|
Short distance potential and the thick center vortex model
|
9 pages and 6 figures
|
Phys.Rev.D80:054508,2009
|
10.1103/PhysRevD.80.054508
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The short distance potentials between heavy SU(3) and SU(4) sources are
calculated by increasing the role of vortex fluxes piercing Wilson loops with
contributions close to the trivial center element and by fluctuating the vortex
core size in the model of thick center vortices. By this method, a Coulombic
potential consistent with Casimir scaling is obtained. In addition, all other
features of the potential including a linear intermediate potential in
agreement with Casimir scaling and a large distance potential proportional to
the $N$-ality of the representation are restored. Therefore, the model of thick
center vortices may be used as a phenomenological model, which is able to
describe the potential for all regimes.
|
[
{
"created": "Sun, 4 Oct 2009 12:09:52 GMT",
"version": "v1"
}
] |
2014-11-20
|
[
[
"Deldar",
"Sedigheh",
"",
"University of Tehran"
],
[
"Rafibakhsh",
"Shahnoosh",
"",
"University of Tehran"
]
] |
The short distance potentials between heavy SU(3) and SU(4) sources are calculated by increasing the role of vortex fluxes piercing Wilson loops with contributions close to the trivial center element and by fluctuating the vortex core size in the model of thick center vortices. By this method, a Coulombic potential consistent with Casimir scaling is obtained. In addition, all other features of the potential including a linear intermediate potential in agreement with Casimir scaling and a large distance potential proportional to the $N$-ality of the representation are restored. Therefore, the model of thick center vortices may be used as a phenomenological model, which is able to describe the potential for all regimes.
|
1401.6704
|
Takeshi Fukuyama
|
Takeshi Fukuyama
|
Chiral Molecule in the Standard Model
|
14 pages. Comments on the relations among chirality, electric dipole
moment, and natural optical activity are added
|
Mod. Phys. Lett. A, Vol. 29, No. 11 (2014)
|
10.1142/S0217732314500564
| null |
hep-ph physics.bio-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This review is based on the talk in the conference of "Spectroscopic Studies
on Molecular Chirality" held on Dec 20-21 2013. The objects of the present
paper are to (1) derive the energy difference between Laevorotatory, or
left-handed, (L-) and Dextrotatory, or right-handed, (D-) molecules and to (2)
discuss how this tiny energy difference leads us to the observed enantiomer
excess. Relations with other parity violating phenomena in molecules, electric
dipole moment and natural optical activity, are also discussed.
|
[
{
"created": "Sun, 26 Jan 2014 23:01:20 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Feb 2014 08:59:43 GMT",
"version": "v2"
},
{
"created": "Fri, 28 Feb 2014 13:17:35 GMT",
"version": "v3"
}
] |
2014-04-02
|
[
[
"Fukuyama",
"Takeshi",
""
]
] |
This review is based on the talk in the conference of "Spectroscopic Studies on Molecular Chirality" held on Dec 20-21 2013. The objects of the present paper are to (1) derive the energy difference between Laevorotatory, or left-handed, (L-) and Dextrotatory, or right-handed, (D-) molecules and to (2) discuss how this tiny energy difference leads us to the observed enantiomer excess. Relations with other parity violating phenomena in molecules, electric dipole moment and natural optical activity, are also discussed.
|
hep-ph/0101162
|
Chia-Hung Chang
|
Chia-Hung V. Chang (National Taiwan Normal University) and Wei-Shu Hou
(National Taiwan University)
|
Probing for the Charm Content of $B$ and $\Upsilon$ Mesons
|
4 pages, REVTEX, 10 eps figures included. Major revision with more
discussions on the rescattering background, and a reappraisal of the
Upsilon(1S) decay in the presence of intrinsic charm, leading to a change in
Title
|
Phys.Rev.D64:071501,2001
|
10.1103/PhysRevD.64.071501
| null |
hep-ph
| null |
A slow $J/\psi$ bump exists in the inclusive $B\to J/\psi + X$ spectrum,
while the softness of $J/\psi$ spectrum in $\Upsilon(1S) \to J/\psi + X$ decay
is in strong contrast with expectations from color octet mechanism. We propose
{\it intrinsic} charm as the explanation:the former is due to $\bar B\to J/\psi
D \pi$,with three charm quarks in the final state; the latter is just a small
fraction of $\Upsilon(1S) \to (c\bar c)_{\rm slow} + 2$"jet" events, where the
slow moving $c\bar c$ system evolves into $D^{(*)}$ pairs. Experimental search
for these phenomena at B Factories and the Tevatron is strongly urged, as the
implications go beyond QCD.
|
[
{
"created": "Mon, 15 Jan 2001 17:46:08 GMT",
"version": "v1"
},
{
"created": "Thu, 24 May 2001 08:48:17 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Chang",
"Chia-Hung V.",
"",
"National Taiwan Normal University"
],
[
"Hou",
"Wei-Shu",
"",
"National Taiwan University"
]
] |
A slow $J/\psi$ bump exists in the inclusive $B\to J/\psi + X$ spectrum, while the softness of $J/\psi$ spectrum in $\Upsilon(1S) \to J/\psi + X$ decay is in strong contrast with expectations from color octet mechanism. We propose {\it intrinsic} charm as the explanation:the former is due to $\bar B\to J/\psi D \pi$,with three charm quarks in the final state; the latter is just a small fraction of $\Upsilon(1S) \to (c\bar c)_{\rm slow} + 2$"jet" events, where the slow moving $c\bar c$ system evolves into $D^{(*)}$ pairs. Experimental search for these phenomena at B Factories and the Tevatron is strongly urged, as the implications go beyond QCD.
|
1006.5821
|
Jae-hyeon Park
|
P. Ko (KIAS) and Jae-hyeon Park (DESY Hamburg)
|
Addendum to: Implications of the measurements of B_s-B_s bar mixing on
SUSY models
|
4 pages, 2 figures, addendum to arXiv:0809.0705, published version
|
Phys.Rev.D82:117701,2010
|
10.1103/PhysRevD.82.117701
|
DESY 10-097
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This is an addendum to the previous publication, P. Ko and J.-h. Park, Phys.
Rev. D80, 035019 (2009). The semileptonic charge asymmetry in B_s decays is
discussed in the context of general MSSM with gluino-mediated flavor and CP
violation in light of the recent measurements at the Tevatron.
|
[
{
"created": "Wed, 30 Jun 2010 09:42:12 GMT",
"version": "v1"
},
{
"created": "Sun, 4 Jul 2010 15:52:41 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Dec 2010 17:51:16 GMT",
"version": "v3"
}
] |
2010-12-21
|
[
[
"Ko",
"P.",
"",
"KIAS"
],
[
"Park",
"Jae-hyeon",
"",
"DESY Hamburg"
]
] |
This is an addendum to the previous publication, P. Ko and J.-h. Park, Phys. Rev. D80, 035019 (2009). The semileptonic charge asymmetry in B_s decays is discussed in the context of general MSSM with gluino-mediated flavor and CP violation in light of the recent measurements at the Tevatron.
|
hep-ph/9212300
| null |
Jose F. Nieves & Palash B. Pal
|
The Third Electromagnetic Constant of an Isotropic Medium:
|
(LaTex, including figures drawn by Latex). One small section and some
references added. This is the final version for the journal
|
Am.J.Phys. 62 (1994) 207
|
10.1119/1.17598
| null |
hep-ph cond-mat
| null |
In addition to the dielectric and magnetic permeability constants, another
constant is generally needed to describe the electrodynamic properties of a
linear isotropic medium. We discuss why the need for the third constant arises
and what sort of physical situations can give rise to a non-zero value for it.
This additional constant, which we call the {\em ``Activity Constant''} and
denote by $\zeta$, can explain optical activity and other phenomena from a
purely macroscopic and phenomenological point of view.
|
[
{
"created": "Tue, 22 Dec 1992 18:56:24 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Mar 1994 18:44:15 GMT",
"version": "v2"
}
] |
2009-10-22
|
[
[
"Nieves",
"Jose F.",
""
],
[
"Pal",
"Palash B.",
""
]
] |
In addition to the dielectric and magnetic permeability constants, another constant is generally needed to describe the electrodynamic properties of a linear isotropic medium. We discuss why the need for the third constant arises and what sort of physical situations can give rise to a non-zero value for it. This additional constant, which we call the {\em ``Activity Constant''} and denote by $\zeta$, can explain optical activity and other phenomena from a purely macroscopic and phenomenological point of view.
|
2206.05297
|
Emidio Gabrielli
|
Sanjoy Biswas, Emidio Gabrielli, Barbara Mele
|
Dark photon searches via Higgs boson production at the LHC and beyond
|
same as published version, text improved, new references added, 41
pages, 14 figures
|
Symmetry 2022, Volume 14 (8), 1522
|
10.3390/sym14081522
| null |
hep-ph astro-ph.HE hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Many scenarios beyond the standard model, aiming to solve long-standing
cosmological and particle physics problems, suggest that dark matter might
experience long-distance interactions mediated by an unbroken dark $U(1)$ gauge
symmetry, hence foreseeing the existence of a massless dark photon. Contrary to
the massive dark photon, a massless dark photon can only couple to the standard
model sector by means of effective higher dimensional operators. Massless
dark-photon production at colliders will then in general be suppressed at low
energy by a UV energy scale, which is of the order of the masses of portal
(messenger) fields connecting the dark and the observable sectors. A violation
of this expectation is provided by dark-photon production mediated by the Higgs
boson, thanks to the non-decoupling Higgs properties. Higgs-boson production at
colliders, followed by the Higgs decay into a photon and a dark photon,
provides then a very promising production mechanism for the dark photon
discovery, being insensitive in particular regimes to the UV scale of the new
physics. This decay channel gives rise to a peculiar signature characterized by
a monochromatic photon with energy half the Higgs mass (in the Higgs rest
frame) plus missing energy. We show how such resonant
photon-plus-missing-energy signature can uniquely be connected to a dark photon
production. Higgs boson production and decay into a photon and a dark photon as
a source of dark photons is reviewed at the Large Hadron Collider, in the light
of the present bounds on the corresponding signature by the CMS and ATLAS
collaborations. Perspectives for the dark-photon production in Higgs-mediated
processes at future $e^+e^-$ colliders are also discussed.
|
[
{
"created": "Fri, 10 Jun 2022 18:00:02 GMT",
"version": "v1"
},
{
"created": "Sun, 31 Jul 2022 17:22:32 GMT",
"version": "v2"
}
] |
2022-08-02
|
[
[
"Biswas",
"Sanjoy",
""
],
[
"Gabrielli",
"Emidio",
""
],
[
"Mele",
"Barbara",
""
]
] |
Many scenarios beyond the standard model, aiming to solve long-standing cosmological and particle physics problems, suggest that dark matter might experience long-distance interactions mediated by an unbroken dark $U(1)$ gauge symmetry, hence foreseeing the existence of a massless dark photon. Contrary to the massive dark photon, a massless dark photon can only couple to the standard model sector by means of effective higher dimensional operators. Massless dark-photon production at colliders will then in general be suppressed at low energy by a UV energy scale, which is of the order of the masses of portal (messenger) fields connecting the dark and the observable sectors. A violation of this expectation is provided by dark-photon production mediated by the Higgs boson, thanks to the non-decoupling Higgs properties. Higgs-boson production at colliders, followed by the Higgs decay into a photon and a dark photon, provides then a very promising production mechanism for the dark photon discovery, being insensitive in particular regimes to the UV scale of the new physics. This decay channel gives rise to a peculiar signature characterized by a monochromatic photon with energy half the Higgs mass (in the Higgs rest frame) plus missing energy. We show how such resonant photon-plus-missing-energy signature can uniquely be connected to a dark photon production. Higgs boson production and decay into a photon and a dark photon as a source of dark photons is reviewed at the Large Hadron Collider, in the light of the present bounds on the corresponding signature by the CMS and ATLAS collaborations. Perspectives for the dark-photon production in Higgs-mediated processes at future $e^+e^-$ colliders are also discussed.
|
hep-ph/0211123
|
Andre Sopczak
|
J. Gunion, T. Han, J. Jiang, A. Sopczak
|
Overview of tan(beta) Determination at a Linear e+e- Collider
|
7 pages, 6 figures. Proceedings SUSY02, DESY, Germany; and LCWS02,
Jeju, Korea
| null | null | null |
hep-ph
| null |
The ratio of the vacuum expectation value of the two Higgs doublets,
tan(beta), is an important parameter of the general 2-Higgs-Doublet Model
(2HDM) and the Minimal Supersymmetric extension of the Standard Model (MSSM).
The expected uncertainty on the determination of tan(beta) at a Linear Collider
(LC) of at least 500 GeV center-of-mass energy and high luminosity is reviewed
based on studies of neutral and charged Higgs boson production.
|
[
{
"created": "Fri, 8 Nov 2002 19:42:28 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Gunion",
"J.",
""
],
[
"Han",
"T.",
""
],
[
"Jiang",
"J.",
""
],
[
"Sopczak",
"A.",
""
]
] |
The ratio of the vacuum expectation value of the two Higgs doublets, tan(beta), is an important parameter of the general 2-Higgs-Doublet Model (2HDM) and the Minimal Supersymmetric extension of the Standard Model (MSSM). The expected uncertainty on the determination of tan(beta) at a Linear Collider (LC) of at least 500 GeV center-of-mass energy and high luminosity is reviewed based on studies of neutral and charged Higgs boson production.
|
2407.12930
|
Kunfeng Lyu
|
Raymond T. Co, Tony Gherghetta, Zhen Liu and Kun-Feng Lyu
|
A Light QCD Axion with Hilltop Misalignment
|
28 pages, 9 figures
| null | null |
UMN-TH-4326/24
|
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the cosmological evolution of a light QCD axion and identify the
parameter space to obtain the correct relic dark matter abundance. The axion
potential is flattened at the origin, corresponding to the only minimum, while
it is unsuppressed at $\pi$. These potential features arise by assuming a
mirror sector with the strong CP phase $\bar\theta$ shifted by $\pi$ compared
to the SM sector, which allows the mirror axion potential to be tuned against
the usual QCD axion potential. Before the QCD phase transition, assuming the
mirror sector is decoupled and much colder than the SM thermal bath, the mirror
sector potential dominates, causing the axion to initially roll to a temporary
minimum at $\pi$. However, after the QCD phase transition, the potential
minimum changes, and the axion relaxes from the newly created "hilltop" near
$\pi$ to the CP-conserving minimum at the origin. As the axion adiabatically
tracks this shift in the potential minimum through the QCD phase transition,
with non-adiabatic evolution near $\pi$ and 0, it alters the usual prediction
of the dark matter abundance. Consequently, this "hilltop" misalignment
mechanism opens new regions of axion parameter space, with the correct relic
abundance while still solving the strong CP problem, that could be explored in
future experiments.
|
[
{
"created": "Wed, 17 Jul 2024 18:03:47 GMT",
"version": "v1"
}
] |
2024-07-19
|
[
[
"Co",
"Raymond T.",
""
],
[
"Gherghetta",
"Tony",
""
],
[
"Liu",
"Zhen",
""
],
[
"Lyu",
"Kun-Feng",
""
]
] |
We study the cosmological evolution of a light QCD axion and identify the parameter space to obtain the correct relic dark matter abundance. The axion potential is flattened at the origin, corresponding to the only minimum, while it is unsuppressed at $\pi$. These potential features arise by assuming a mirror sector with the strong CP phase $\bar\theta$ shifted by $\pi$ compared to the SM sector, which allows the mirror axion potential to be tuned against the usual QCD axion potential. Before the QCD phase transition, assuming the mirror sector is decoupled and much colder than the SM thermal bath, the mirror sector potential dominates, causing the axion to initially roll to a temporary minimum at $\pi$. However, after the QCD phase transition, the potential minimum changes, and the axion relaxes from the newly created "hilltop" near $\pi$ to the CP-conserving minimum at the origin. As the axion adiabatically tracks this shift in the potential minimum through the QCD phase transition, with non-adiabatic evolution near $\pi$ and 0, it alters the usual prediction of the dark matter abundance. Consequently, this "hilltop" misalignment mechanism opens new regions of axion parameter space, with the correct relic abundance while still solving the strong CP problem, that could be explored in future experiments.
|
hep-ph/9307309
| null |
Graciela Gelmini
|
Beyond the Standard Model
|
48 pages, UCLA-93-TEP-33
| null | null | null |
hep-ph
| null |
These are three lectures given at the ``Lake Louise Winter Institute", (Lake
Louise Canada, Feb 1993). A pedagogical introduction is given to attempts to
formulate a more fundamental theory of elementary particles than that provided
by the standard model. After a review of the basic elements of the standard
model, its unsatisfactory features, and ideas to modify them will be discussed.
An introduction to Technicolour, t-quark condensates, supersymmetric models,
GUT's and a brief comment on composite models follow.
|
[
{
"created": "Tue, 20 Jul 1993 17:37:00 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Gelmini",
"Graciela",
""
]
] |
These are three lectures given at the ``Lake Louise Winter Institute", (Lake Louise Canada, Feb 1993). A pedagogical introduction is given to attempts to formulate a more fundamental theory of elementary particles than that provided by the standard model. After a review of the basic elements of the standard model, its unsatisfactory features, and ideas to modify them will be discussed. An introduction to Technicolour, t-quark condensates, supersymmetric models, GUT's and a brief comment on composite models follow.
|
1612.02659
|
Fl. Stancu
|
Fl. Stancu
|
SU(3) flavor symmetry breaking in large $N_c$ excited hyperons
|
corrected typos. arXiv admin note: substantial text overlap with
arXiv:1604.07324
|
Phys.Rev.D94(2016)no.11,114027
|
10.1103/PhysRevD.94.114027
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The $1/N_c$ expansion method for studying the mass spectrum of excited
baryons is shortly reviewed together with applications to mixed symmetric
states. The $[{\bf 70, \ell^+}]$ multiplet, belonging to the $N$ = 2 band, is
reanalyzed, with emphasis on hyperons and the SU(3) symmetry breaking operators
entering the mass formula to first order. An important result is that the
hierarchy of masses as a function of strangeness is correctly reproduced for
all multiplets. Predictions for unknown excited hyperons to SU(6) $\times$ O(3)
multiplets are made.
|
[
{
"created": "Thu, 8 Dec 2016 14:21:03 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Feb 2017 15:22:32 GMT",
"version": "v2"
}
] |
2017-02-02
|
[
[
"Stancu",
"Fl.",
""
]
] |
The $1/N_c$ expansion method for studying the mass spectrum of excited baryons is shortly reviewed together with applications to mixed symmetric states. The $[{\bf 70, \ell^+}]$ multiplet, belonging to the $N$ = 2 band, is reanalyzed, with emphasis on hyperons and the SU(3) symmetry breaking operators entering the mass formula to first order. An important result is that the hierarchy of masses as a function of strangeness is correctly reproduced for all multiplets. Predictions for unknown excited hyperons to SU(6) $\times$ O(3) multiplets are made.
|
hep-ph/9911329
|
Nir Polonsky
|
Nir Polonsky
|
The $\mu$-Parameter of Supersymmetry
|
31 pages. LaTex2e + World Scientific ws-p8-50x6-00 (included)
| null | null |
MIT-CTP-2923
|
hep-ph
| null |
The Higgsino mass, or equivalently the $\mu$-parameter, plays an essential
role in determining the phenomenology of any supersymmetric model.
Particularly, the size of the supersymmetry conserving mu-parameter must be
correlated with the size of the soft supersymmetry breaking parameters. The
source of this correlation in the underlying ultra-violet theory is one of the
mysteries of supersymmetry model building. The puzzle and the various
possibilities for its resolution are reviewed, stressing both phenomenological
and theoretical aspects. New proposals in the context of supergravity and
gauge-mediation frameworks for the soft supersymmetry breaking parameters are
examined in some detail.
|
[
{
"created": "Fri, 12 Nov 1999 19:52:29 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Polonsky",
"Nir",
""
]
] |
The Higgsino mass, or equivalently the $\mu$-parameter, plays an essential role in determining the phenomenology of any supersymmetric model. Particularly, the size of the supersymmetry conserving mu-parameter must be correlated with the size of the soft supersymmetry breaking parameters. The source of this correlation in the underlying ultra-violet theory is one of the mysteries of supersymmetry model building. The puzzle and the various possibilities for its resolution are reviewed, stressing both phenomenological and theoretical aspects. New proposals in the context of supergravity and gauge-mediation frameworks for the soft supersymmetry breaking parameters are examined in some detail.
|
1703.08322
|
C\'edric Lorc\'e
|
Amit Bhoonah (ETH Z\"urich) and C\'edric Lorc\'e (Ecole polytechnique,
CPHT)
|
Quark transverse spin-orbit correlations
|
7 pages, 1 table
| null |
10.1016/j.physletb.2017.10.003
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We extend the study of quark spin-orbit correlations in the nucleon to the
case of transverse polarization. At the leading-twist level, this completes the
spin structure of the quark kinetic energy-momentum tensor. In particular, we
revisit the transversity decomposition of angular momentum proposed a decade
ago by Burkardt and introduce a new transverse correlation, namely between
quark transversity and orbital angular momentum. We also provide for the first
time the Wandzura-Wilczek expression for the second Mellin moment of twist-3
transversity generalized parton distributions, along with a new sum rule. Based
on lattice calculation results, we conclude that the quark transverse
spin-orbit correlation is negative for both up and down flavors, just like in
the longitudinal case.
|
[
{
"created": "Fri, 24 Mar 2017 09:24:49 GMT",
"version": "v1"
}
] |
2017-11-22
|
[
[
"Bhoonah",
"Amit",
"",
"ETH Zürich"
],
[
"Lorcé",
"Cédric",
"",
"Ecole polytechnique,\n CPHT"
]
] |
We extend the study of quark spin-orbit correlations in the nucleon to the case of transverse polarization. At the leading-twist level, this completes the spin structure of the quark kinetic energy-momentum tensor. In particular, we revisit the transversity decomposition of angular momentum proposed a decade ago by Burkardt and introduce a new transverse correlation, namely between quark transversity and orbital angular momentum. We also provide for the first time the Wandzura-Wilczek expression for the second Mellin moment of twist-3 transversity generalized parton distributions, along with a new sum rule. Based on lattice calculation results, we conclude that the quark transverse spin-orbit correlation is negative for both up and down flavors, just like in the longitudinal case.
|
hep-ph/9211230
| null |
D. Comelli (Dept. of Theorical Physics, University of Trieste and INFN
sez.di Trieste)
|
Radiatively Corrected Bound on the Light Higgs Mass in a Minimal Non
Minimal Supersymmetric Standard Model
| null | null | null | null |
hep-ph
| null |
The neutral Higgs sector of the Minimal non Minimal Supersymmetric Standard
Model is considered. By effective potential and R.G.E. supported method; an
upper bound of the lightest Higgs is analysed. From the request of
perturbativity of the coupling in the superpotential, adding the leading stop
top contributions, the absolute bound of $\sim 130$ GeV for $90 GeV < m_t< 180
GeV$ and $M_{\tilde{t}} \simeq 1000 $ GeV is derived. The interesting
dependence on $m_t$ for $\tan{\beta} \to 1$ is discussed .
|
[
{
"created": "Mon, 9 Nov 1992 16:12:57 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Comelli",
"D.",
"",
"Dept. of Theorical Physics, University of Trieste and INFN\n sez.di Trieste"
]
] |
The neutral Higgs sector of the Minimal non Minimal Supersymmetric Standard Model is considered. By effective potential and R.G.E. supported method; an upper bound of the lightest Higgs is analysed. From the request of perturbativity of the coupling in the superpotential, adding the leading stop top contributions, the absolute bound of $\sim 130$ GeV for $90 GeV < m_t< 180 GeV$ and $M_{\tilde{t}} \simeq 1000 $ GeV is derived. The interesting dependence on $m_t$ for $\tan{\beta} \to 1$ is discussed .
|
0901.0260
|
Sukanta Dutta
|
Sukanta Dutta, Ashok Goyal and Mamta
|
New Physics Contribution to Neutral Trilinear Gauge Boson Couplings
|
19 pages, 5 figures, 3 tables
|
Eur.Phys.J.C63:305-315,2009
|
10.1140/epjc/s10052-009-1103-2
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the one loop new physics effects to the CP even triple neutral gauge
boson vertices $\gamma^\star \gamma Z$, $\gamma^\star Z Z$, $Z^\star Z \gamma$
and $Z^\star Z Z$ in the context of Little Higgs models. We compute the
contribution of the additional fermions in Littles Higgs model in the framework
of direct product groups where $[SU(2)\times U(1)]^2 $ gauge symmetry is
embedded in SU(5) global symmetry and also in the framework of simple group
where $SU(N)\times U(1)$ gauge symmetry breaks down to $SU(2)_L\times U(1)$. We
calculate the contribution of the fermions to these couplings when $T$ parity
is invoked. In addition, we re-examine the MSSM contribution at the chosen
point of SPS1a' and compare with the SM and Little Higgs models.
|
[
{
"created": "Fri, 2 Jan 2009 17:46:31 GMT",
"version": "v1"
},
{
"created": "Wed, 13 May 2009 07:45:12 GMT",
"version": "v2"
}
] |
2009-11-19
|
[
[
"Dutta",
"Sukanta",
""
],
[
"Goyal",
"Ashok",
""
],
[
"Mamta",
"",
""
]
] |
We study the one loop new physics effects to the CP even triple neutral gauge boson vertices $\gamma^\star \gamma Z$, $\gamma^\star Z Z$, $Z^\star Z \gamma$ and $Z^\star Z Z$ in the context of Little Higgs models. We compute the contribution of the additional fermions in Littles Higgs model in the framework of direct product groups where $[SU(2)\times U(1)]^2 $ gauge symmetry is embedded in SU(5) global symmetry and also in the framework of simple group where $SU(N)\times U(1)$ gauge symmetry breaks down to $SU(2)_L\times U(1)$. We calculate the contribution of the fermions to these couplings when $T$ parity is invoked. In addition, we re-examine the MSSM contribution at the chosen point of SPS1a' and compare with the SM and Little Higgs models.
|
1403.5760
|
Celso C. Nishi
|
A. G. Dias, A. C. B. Machado, C. C. Nishi, A. Ringwald, P. Vaudrevange
|
The Quest for an Intermediate-Scale Accidental Axion and Further ALPs
|
43pp, 4 figures. v2: version accepted for publication in JHEP
| null |
10.1007/JHEP06(2014)037
|
DESY 14-020;
|
hep-ph astro-ph.CO astro-ph.HE hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The recent detection of the cosmic microwave background polarimeter
experiment BICEP2 of tensor fluctuations in the B-mode power spectrum basically
excludes all plausible axion models where its decay constant is above $10^{13}$
GeV. Moreover, there are strong theoretical, astrophysical, and cosmological
motivations for models involving, in addition to the axion, also axion-like
particles (ALPs), with decay constants in the intermediate scale range, between
$10^9$ GeV and $10^{13}$ GeV. Here, we present a general analysis of models
with an axion and further ALPs and derive bounds on the relative size of the
axion and ALP photon (and electron) coupling. We discuss what we can learn from
measurements of the axion and ALP photon couplings about the fundamental
parameters of the underlying ultraviolet completion of the theory. For the
latter we consider extensions of the Standard Model in which the axion and the
ALP(s) appear as pseudo Nambu-Goldstone bosons from the breaking of global
chiral $U(1)$ (Peccei-Quinn (PQ)) symmetries, occuring accidentally as low
energy remnants from exact discrete symmetries. In such models, the axion and
the further ALP are protected from disastrous explicit symmetry breaking
effects due to Planck-scale suppressed operators. The scenarios considered
exploit heavy right handed neutrinos getting their mass via PQ symmetry
breaking and thus explain the small mass of the active neutrinos via a seesaw
relation between the electroweak and an intermediate PQ symmetry breaking
scale. We show some models that can accommodate simultaneously an axion dark
matter candidate, an ALP explaining the anomalous transparency of the universe
for $\gamma$-rays, and an ALP explaining the recently reported 3.55 keV gamma
line from galaxies and clusters of galaxies, if the respective decay constants
are of intermediate scale.
|
[
{
"created": "Sun, 23 Mar 2014 15:08:06 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Jun 2014 12:44:33 GMT",
"version": "v2"
}
] |
2015-06-19
|
[
[
"Dias",
"A. G.",
""
],
[
"Machado",
"A. C. B.",
""
],
[
"Nishi",
"C. C.",
""
],
[
"Ringwald",
"A.",
""
],
[
"Vaudrevange",
"P.",
""
]
] |
The recent detection of the cosmic microwave background polarimeter experiment BICEP2 of tensor fluctuations in the B-mode power spectrum basically excludes all plausible axion models where its decay constant is above $10^{13}$ GeV. Moreover, there are strong theoretical, astrophysical, and cosmological motivations for models involving, in addition to the axion, also axion-like particles (ALPs), with decay constants in the intermediate scale range, between $10^9$ GeV and $10^{13}$ GeV. Here, we present a general analysis of models with an axion and further ALPs and derive bounds on the relative size of the axion and ALP photon (and electron) coupling. We discuss what we can learn from measurements of the axion and ALP photon couplings about the fundamental parameters of the underlying ultraviolet completion of the theory. For the latter we consider extensions of the Standard Model in which the axion and the ALP(s) appear as pseudo Nambu-Goldstone bosons from the breaking of global chiral $U(1)$ (Peccei-Quinn (PQ)) symmetries, occuring accidentally as low energy remnants from exact discrete symmetries. In such models, the axion and the further ALP are protected from disastrous explicit symmetry breaking effects due to Planck-scale suppressed operators. The scenarios considered exploit heavy right handed neutrinos getting their mass via PQ symmetry breaking and thus explain the small mass of the active neutrinos via a seesaw relation between the electroweak and an intermediate PQ symmetry breaking scale. We show some models that can accommodate simultaneously an axion dark matter candidate, an ALP explaining the anomalous transparency of the universe for $\gamma$-rays, and an ALP explaining the recently reported 3.55 keV gamma line from galaxies and clusters of galaxies, if the respective decay constants are of intermediate scale.
|
1111.0176
|
Joel Jones-Perez
|
L. Calibbi and R. N. Hodgkinson and J. Jones-Perez and A. Masiero and
O. Vives
|
Flavour and Collider Interplay for SUSY at LHC7
|
44 pages, 15 figures; v3: minor corrections, added references,
updated figures. Version accepted for publication
|
Eur. Phys. J. C (2012) 72:1863
|
10.1140/epjc/s10052-012-1863-y
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The current 7 TeV run of the LHC experiment shall be able to probe gluino and
squark masses up to values larger than 1 TeV. Assuming that hints for SUSY are
found in the jets plus missing energy channel by the end of a 5 fb$^{-1}$ run,
we explore the flavour constraints on three models with a CMSSM-like spectrum:
the CMSSM itself, a Seesaw extension of the CMSSM, and Flavoured CMSSM. In
particular, we focus on decays that might have been measured by the time the
run is concluded, such as $B_s\to\mu\mu$ and $\mu\to e\gamma$. We also analyse
constraints imposed by neutral meson bounds and electric dipole moments. The
interplay between collider and flavour experiments is explored through the use
of three benchmark scenarios, finding the flavour feedback useful in order to
determine the model parameters and to test the consistency of the different
models.
|
[
{
"created": "Tue, 1 Nov 2011 11:43:08 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Nov 2011 10:13:54 GMT",
"version": "v2"
},
{
"created": "Fri, 13 Jan 2012 14:34:32 GMT",
"version": "v3"
}
] |
2012-03-14
|
[
[
"Calibbi",
"L.",
""
],
[
"Hodgkinson",
"R. N.",
""
],
[
"Jones-Perez",
"J.",
""
],
[
"Masiero",
"A.",
""
],
[
"Vives",
"O.",
""
]
] |
The current 7 TeV run of the LHC experiment shall be able to probe gluino and squark masses up to values larger than 1 TeV. Assuming that hints for SUSY are found in the jets plus missing energy channel by the end of a 5 fb$^{-1}$ run, we explore the flavour constraints on three models with a CMSSM-like spectrum: the CMSSM itself, a Seesaw extension of the CMSSM, and Flavoured CMSSM. In particular, we focus on decays that might have been measured by the time the run is concluded, such as $B_s\to\mu\mu$ and $\mu\to e\gamma$. We also analyse constraints imposed by neutral meson bounds and electric dipole moments. The interplay between collider and flavour experiments is explored through the use of three benchmark scenarios, finding the flavour feedback useful in order to determine the model parameters and to test the consistency of the different models.
|
1408.0300
|
Thorsten Feldmann
|
Thorsten Feldmann (Siegen U.)
|
Non-Leptonic Heavy Meson Decays - Theory Status
|
Presented at the 2014 Flavor Physics and CP Violation (FPCP-2014),
Marseille, France, May 26-30 2014, 13 pages, 2 figures
| null | null |
SI-HEP/14-18, QFET/14-12
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I briefly review the status and recent progress in the theoretical
understanding of non-leptonic decays of beauty and charm hadrons. Focusing on a
personal selection of topics, this covers perturbative calculations in quantum
chromodynamics, analyses using flavour symmetries of strong interactions, and
the modelling of the relevant hadronic input functions.
|
[
{
"created": "Fri, 1 Aug 2014 20:28:36 GMT",
"version": "v1"
}
] |
2014-08-05
|
[
[
"Feldmann",
"Thorsten",
"",
"Siegen U."
]
] |
I briefly review the status and recent progress in the theoretical understanding of non-leptonic decays of beauty and charm hadrons. Focusing on a personal selection of topics, this covers perturbative calculations in quantum chromodynamics, analyses using flavour symmetries of strong interactions, and the modelling of the relevant hadronic input functions.
|
hep-ph/9903540
|
Robert Fleischer
|
Robert Fleischer (CERN)
|
Extracting CKM Phases from Angular Distributions of $B_{d,s}$ Decays
into Admixtures of CP Eigenstates
|
22 pages, 1 figure (modified presentation, including an extended
discussion of $B_d\to J/\psi \rho^0$; conclusions partly changed)
|
Phys. Rev. D 60, 073008 (1999)
|
10.1103/PhysRevD.60.073008
|
CERN-TH/99-92
|
hep-ph
| null |
The time-dependent angular distributions of certain $B_{d,s}$ decays into
final states that are admixtures of CP-even and CP-odd configurations provide
valuable information about CKM phases and hadronic parameters. We present the
general formalism to accomplish this task, taking also into account penguin
contributions, and illustrate it by considering a few specific decay modes. We
give particular emphasis to the decay $B_d\to J/\psi \rho^0$, which can be
combined with $B_s\to J/\psi \phi$ to extract the $B^0_d - \bar{B^0_d}$ mixing
phase and - if penguin effects in the former mode should be sizeable - also the
angle $\gamma$ of the unitarity triangle. As an interesting by-product, this
strategy allows us to take into account also the penguin effects in the
extraction of the $B^0_s - \bar{B^0_s}$ mixing phase from $B_s\to J/\psi \phi$.
Moreover, a discrete ambiguity in the extraction of the CKM angle $\beta$ can
be resolved, and valuable insights into SU(3)-breaking effects can be obtained.
Other interesting applications of the general formalism presented in this
paper, involving $B_d\to\rho \rho$ and $B_{s,d}\to K^{\ast} \bar{K^\ast}$
decays, are also briefly noted.
|
[
{
"created": "Wed, 31 Mar 1999 12:20:07 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Apr 1999 12:25:27 GMT",
"version": "v2"
}
] |
2016-08-25
|
[
[
"Fleischer",
"Robert",
"",
"CERN"
]
] |
The time-dependent angular distributions of certain $B_{d,s}$ decays into final states that are admixtures of CP-even and CP-odd configurations provide valuable information about CKM phases and hadronic parameters. We present the general formalism to accomplish this task, taking also into account penguin contributions, and illustrate it by considering a few specific decay modes. We give particular emphasis to the decay $B_d\to J/\psi \rho^0$, which can be combined with $B_s\to J/\psi \phi$ to extract the $B^0_d - \bar{B^0_d}$ mixing phase and - if penguin effects in the former mode should be sizeable - also the angle $\gamma$ of the unitarity triangle. As an interesting by-product, this strategy allows us to take into account also the penguin effects in the extraction of the $B^0_s - \bar{B^0_s}$ mixing phase from $B_s\to J/\psi \phi$. Moreover, a discrete ambiguity in the extraction of the CKM angle $\beta$ can be resolved, and valuable insights into SU(3)-breaking effects can be obtained. Other interesting applications of the general formalism presented in this paper, involving $B_d\to\rho \rho$ and $B_{s,d}\to K^{\ast} \bar{K^\ast}$ decays, are also briefly noted.
|
hep-ph/0409238
|
Otto Kong
|
Otto C. W. Kong (Nat'l Central U, Taiwan)
|
Little Higgs Model Completed with a Chiral Fermionic Sector
|
14 revtex pages with no figure, largely a re-written version of
hep-ph/0307250 with elaboration on flavor sector FCNC constraints; accepted
for publication in Phys.Rev.D
|
Phys.Rev. D70 (2004) 075021
|
10.1103/PhysRevD.70.075021
|
NCU-HEP-k015
|
hep-ph
| null |
The implementation of the little Higgs mechanism to solve the hierarchy
problem provides an interesting guiding principle to build particle physics
models beyond the electroweak scale. Most model building works, however, pay
not much attention to the fermionic sector. Through a case example, we
illustrate how a complete and consistent fermionic sector of the TeV effective
field theory may actually be largely dictated by the gauge structure of the
model. The completed fermionic sector has specific flavor physics structure,
and many phenomenological constraints on the model can thus be obtained beyond
gauge, Higgs, and top physics. We take a first look on some of the quark sector
constraints.
|
[
{
"created": "Tue, 21 Sep 2004 02:38:57 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Kong",
"Otto C. W.",
"",
"Nat'l Central U, Taiwan"
]
] |
The implementation of the little Higgs mechanism to solve the hierarchy problem provides an interesting guiding principle to build particle physics models beyond the electroweak scale. Most model building works, however, pay not much attention to the fermionic sector. Through a case example, we illustrate how a complete and consistent fermionic sector of the TeV effective field theory may actually be largely dictated by the gauge structure of the model. The completed fermionic sector has specific flavor physics structure, and many phenomenological constraints on the model can thus be obtained beyond gauge, Higgs, and top physics. We take a first look on some of the quark sector constraints.
|
2202.01068
|
Gautam Bhattacharyya
|
Gautam Bhattacharyya, Siddharth Dwivedi, Dilip Kumar Ghosh, Gourab
Saha, Subir Sarkar
|
Searching exotic Higgs bosons at the LHC
|
1+23 pages, 8 captioned figures: v2: Discussions on scalar and
pseudoscalar Yukawa couplings in the light of D-D(bar) mixing included; v3:
1+24 pages, 11 captioned figures, more benchmark points studied including
systematic uncertainties in a new Section with additional figures and tables.
Minor change in manuscript title. Accepted for publication in Phys. Rev. D
| null |
10.1103/PhysRevD.106.055032
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyse in a model independent way the possibilities of digging out
neutral exotic Higgs states, should they exist endowed with unconventional
couplings with ordinary matter and gauge fields, at the 14 TeV run of the Large
Hadron Collider (LHC), adding some comparative studies for 13.6 and 13 TeV
runs. Flavor models, based on some discrete symmetry groups, with extended
scalar sectors are known to yield exotic spin-0 states, both CP-even and
CP-odd, with purely flavor off-diagonal Yukawa couplings. The gauge interaction
of one such CP-even state is also unusual that, unlike the Standard Model Higgs
boson, it does not couple to gauge boson pairs. Such unconventional properties
immune these exotic states from receiving traditional collider and electroweak
constraints, and hence those states could be light. Without committing to any
specific model, exploiting their peculiar Yukawa and gauge properties, we
explore the discovery potential of those exotic Higgs states through some
interesting topologies by figuring out some specific kinematic variables that
suppress the backgrounds.
|
[
{
"created": "Wed, 2 Feb 2022 14:58:32 GMT",
"version": "v1"
},
{
"created": "Mon, 2 May 2022 10:23:36 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Sep 2022 09:54:43 GMT",
"version": "v3"
}
] |
2022-10-05
|
[
[
"Bhattacharyya",
"Gautam",
""
],
[
"Dwivedi",
"Siddharth",
""
],
[
"Ghosh",
"Dilip Kumar",
""
],
[
"Saha",
"Gourab",
""
],
[
"Sarkar",
"Subir",
""
]
] |
We analyse in a model independent way the possibilities of digging out neutral exotic Higgs states, should they exist endowed with unconventional couplings with ordinary matter and gauge fields, at the 14 TeV run of the Large Hadron Collider (LHC), adding some comparative studies for 13.6 and 13 TeV runs. Flavor models, based on some discrete symmetry groups, with extended scalar sectors are known to yield exotic spin-0 states, both CP-even and CP-odd, with purely flavor off-diagonal Yukawa couplings. The gauge interaction of one such CP-even state is also unusual that, unlike the Standard Model Higgs boson, it does not couple to gauge boson pairs. Such unconventional properties immune these exotic states from receiving traditional collider and electroweak constraints, and hence those states could be light. Without committing to any specific model, exploiting their peculiar Yukawa and gauge properties, we explore the discovery potential of those exotic Higgs states through some interesting topologies by figuring out some specific kinematic variables that suppress the backgrounds.
|
2207.07056
|
Tobias Neumann
|
Tobias Neumann and John Campbell
|
Fiducial Drell-Yan production at the LHC improved by transverse-momentum
resummation at N$^4$LL+N$^3$LO
|
14 pages, 7 figures; v2: include N3LO fixed order; add details on
calculation and validation
|
Phys. Rev. D 107, L011506, 2023
|
10.1103/PhysRevD.107.L011506
|
FERMILAB-PUB-22-528-T
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Drell-Yan production is one of the precision cornerstones of the LHC, serving
as calibration for measurements such as the $W$-boson mass. Its extreme
precision at the level of 1% challenges theory predictions at the highest
level. We present the first independent calculation of Drell-Yan production at
order $\alpha_s^3$ in transverse-momentum ($q_T$) resummation improved
perturbation theory. Our calculation reaches the state-of-the-art through
inclusion of the recently published four loop rapidity anomalous dimension and
three loop massive axial-vector contributions. We compare to the most recent
data from CMS with fiducial and differential cross-section predictions and find
excellent agreement at the percent level. Our resummed calculation including
the matching to $Z$+jet production at NNLO is publicly available in the
upcoming CuTe-MCFM 10.3 release and allows for theory-data comparison at an
unprecedented level.
|
[
{
"created": "Thu, 14 Jul 2022 16:57:31 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Nov 2022 18:13:03 GMT",
"version": "v2"
}
] |
2023-01-30
|
[
[
"Neumann",
"Tobias",
""
],
[
"Campbell",
"John",
""
]
] |
Drell-Yan production is one of the precision cornerstones of the LHC, serving as calibration for measurements such as the $W$-boson mass. Its extreme precision at the level of 1% challenges theory predictions at the highest level. We present the first independent calculation of Drell-Yan production at order $\alpha_s^3$ in transverse-momentum ($q_T$) resummation improved perturbation theory. Our calculation reaches the state-of-the-art through inclusion of the recently published four loop rapidity anomalous dimension and three loop massive axial-vector contributions. We compare to the most recent data from CMS with fiducial and differential cross-section predictions and find excellent agreement at the percent level. Our resummed calculation including the matching to $Z$+jet production at NNLO is publicly available in the upcoming CuTe-MCFM 10.3 release and allows for theory-data comparison at an unprecedented level.
|
hep-ph/0407333
|
Patrick Huber
|
P. Huber, M. Lindner and W. Winter
|
Simulation of long-baseline neutrino oscillation experiments with GLoBES
|
9 pages, 5 figures, Software available at
http://www.ph.tum.de/~globes
|
Comput.Phys.Commun. 167 (2005) 195
|
10.1016/j.cpc.2005.01.003
|
TUM-HEP 553/04
|
hep-ph hep-ex
| null |
We present the GLoBES (``General Long Baseline Experiment Simulator'')
software package, which allows the simulation of long-baseline and reactor
neutrino oscillation experiments. One part of the software is the abstract
experiment definition language to define experiments with beam and full
detector descriptions as accurate as possible. Many systematics options are
provided, such as normalization and energy calibration errors, or the choice
between spectral or total rate information. For the definition of experiments,
a new transparent building block concept is introduced. In addition, an
additional program provides the possibility to develop and test new experiment
definitions quickly. Another part of GLoBES is the user's interface, which
provides probability, rate, and $\Delta \chi^2$ information for a given
experiment or any combination of up to 32 experiments in C. Especially, the
$\Delta \chi^2$ functions allow a simulation with statistics only, systematics,
correlations, and degeneracies. In particular, GLoBES can handle the full
multi-parameter correlation among the oscillation parameters, external input,
and matter density uncertainties.
|
[
{
"created": "Thu, 29 Jul 2004 07:52:44 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Huber",
"P.",
""
],
[
"Lindner",
"M.",
""
],
[
"Winter",
"W.",
""
]
] |
We present the GLoBES (``General Long Baseline Experiment Simulator'') software package, which allows the simulation of long-baseline and reactor neutrino oscillation experiments. One part of the software is the abstract experiment definition language to define experiments with beam and full detector descriptions as accurate as possible. Many systematics options are provided, such as normalization and energy calibration errors, or the choice between spectral or total rate information. For the definition of experiments, a new transparent building block concept is introduced. In addition, an additional program provides the possibility to develop and test new experiment definitions quickly. Another part of GLoBES is the user's interface, which provides probability, rate, and $\Delta \chi^2$ information for a given experiment or any combination of up to 32 experiments in C. Especially, the $\Delta \chi^2$ functions allow a simulation with statistics only, systematics, correlations, and degeneracies. In particular, GLoBES can handle the full multi-parameter correlation among the oscillation parameters, external input, and matter density uncertainties.
|
2202.03076
|
Pasquale Dario Serpico
|
Francesca Calore, Marco Cirelli, Laurent Derome, Yoann Genolini, David
Maurin, Pierre Salati, and Pasquale D. Serpico
|
AMS-02 antiprotons and dark matter: Trimmed hints and robust bounds
|
v2: 33 pages, 6 figures (two of which in two panels); clarifications
and a couple of references added, conclusions unchanged
|
SciPost Phys. 12, 163 (2022)
|
10.21468/SciPostPhys.12.5.163
|
LAPTH-003/22
|
hep-ph astro-ph.HE
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
Based on 4 yr AMS-02 antiproton data, we present bounds on the dark matter
(DM) annihilation cross section vs. mass for some representative final state
channels. We use recent cosmic-ray propagation models, a realistic treatment of
experimental and theoretical errors, and an updated calculation of input
antiproton spectra based on a recent release of the PYTHIA code. We find that
reported hints of a DM signal are statistically insignificant; an adequate
treatment of errors is crucial for credible conclusions. Antiproton bounds on
DM annihilation are among the most stringent ones, probing thermal DM up to the
TeV scale. The dependence of the bounds upon propagation models and the DM halo
profile is also quantified. A preliminary estimate reaches similar conclusions
when applied to the 7 years AMS-02 dataset, but also suggests extra caution as
for possible future claims of DM excesses.
|
[
{
"created": "Mon, 7 Feb 2022 11:15:34 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Mar 2022 14:25:37 GMT",
"version": "v2"
}
] |
2022-05-18
|
[
[
"Calore",
"Francesca",
""
],
[
"Cirelli",
"Marco",
""
],
[
"Derome",
"Laurent",
""
],
[
"Genolini",
"Yoann",
""
],
[
"Maurin",
"David",
""
],
[
"Salati",
"Pierre",
""
],
[
"Serpico",
"Pasquale D.",
""
]
] |
Based on 4 yr AMS-02 antiproton data, we present bounds on the dark matter (DM) annihilation cross section vs. mass for some representative final state channels. We use recent cosmic-ray propagation models, a realistic treatment of experimental and theoretical errors, and an updated calculation of input antiproton spectra based on a recent release of the PYTHIA code. We find that reported hints of a DM signal are statistically insignificant; an adequate treatment of errors is crucial for credible conclusions. Antiproton bounds on DM annihilation are among the most stringent ones, probing thermal DM up to the TeV scale. The dependence of the bounds upon propagation models and the DM halo profile is also quantified. A preliminary estimate reaches similar conclusions when applied to the 7 years AMS-02 dataset, but also suggests extra caution as for possible future claims of DM excesses.
|
1507.02288
|
Anja Butter
|
Anja Butter, Tilman Plehn, Michael Rauch, Dirk Zerwas, Sophie
Henrot-Versill\'e, and R\'emi Lafaye
|
Invisible Higgs Decays to Hooperons in the NMSSM
|
23 pages, 24 figures; v2: references added
|
Phys. Rev. D 93, 015011 (2016)
|
10.1103/PhysRevD.93.015011
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The galactic center excess of gamma ray photons can be naturally explained by
light Majorana fermions in combination with a pseudoscalar mediator. The NMSSM
provides exactly these ingredients. We show that for neutralinos with a
significant singlino component the galactic center excess can be linked to
invisible decays of the Standard-Model-like Higgs at the LHC. We find
predictions for invisible Higgs branching ratios in excess of 50 percent,
easily accessible at the LHC. Constraining the NMSSM through GUT-scale boundary
conditions only slightly affects this expectation. Our results complement
earlier NMSSM studies of the galactic center excess, which link it to heavy
Higgs searches at the LHC.
|
[
{
"created": "Wed, 8 Jul 2015 20:00:50 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Jul 2015 20:01:41 GMT",
"version": "v2"
}
] |
2016-01-27
|
[
[
"Butter",
"Anja",
""
],
[
"Plehn",
"Tilman",
""
],
[
"Rauch",
"Michael",
""
],
[
"Zerwas",
"Dirk",
""
],
[
"Henrot-Versillé",
"Sophie",
""
],
[
"Lafaye",
"Rémi",
""
]
] |
The galactic center excess of gamma ray photons can be naturally explained by light Majorana fermions in combination with a pseudoscalar mediator. The NMSSM provides exactly these ingredients. We show that for neutralinos with a significant singlino component the galactic center excess can be linked to invisible decays of the Standard-Model-like Higgs at the LHC. We find predictions for invisible Higgs branching ratios in excess of 50 percent, easily accessible at the LHC. Constraining the NMSSM through GUT-scale boundary conditions only slightly affects this expectation. Our results complement earlier NMSSM studies of the galactic center excess, which link it to heavy Higgs searches at the LHC.
|
hep-ph/9606253
|
Mikhail Vysotsky
|
M I Vysotsky, V A Novikov, L B Okun (ITEP,Moscow, Russia) and A N
Rozanov (CPPM, Marseille, France)
|
Electroweak radiative corrections in Z boson decays
|
98 pages,21 EPS and PS figures,uses epsf.sty, separate file with the
tared, compressed and uuencoded figures is awailable at
http://wwwtheor.itep.ru/~vysotsky/figures.uu
|
Phys.Usp.39:503-538,1996; Usp.Fiz.Nauk 166:539-574,1996
|
10.1070/PU1996v039n05ABEH000146
| null |
hep-ph
| null |
Contribution to A.D.Sakharov memorial volume. A detailed review of the
electroweak radiative corrections to the Z-boson decays in the framework of the
Minimal Standard Modelm (MSM) is presented. After a short historical
introduction we describe the optimal parametrization of the MSM, especially of
the Born approximation, and derive expressions for the one-loop electroweak
corrections. Finally a global fit of all relevant experimental data is
performed, resulting in fitted values of the top-quark mass, m_t, and strong
coupling constant /alpha_s. Allowed range for the value of the Higgs mass, m_H,
is discussed. Various details of calculations are described in 16 appendices.
|
[
{
"created": "Wed, 5 Jun 1996 09:27:15 GMT",
"version": "v1"
}
] |
2010-12-17
|
[
[
"Vysotsky",
"M I",
"",
"ITEP,Moscow, Russia"
],
[
"Novikov",
"V A",
"",
"ITEP,Moscow, Russia"
],
[
"Okun",
"L B",
"",
"ITEP,Moscow, Russia"
],
[
"Rozanov",
"A N",
"",
"CPPM, Marseille, France"
]
] |
Contribution to A.D.Sakharov memorial volume. A detailed review of the electroweak radiative corrections to the Z-boson decays in the framework of the Minimal Standard Modelm (MSM) is presented. After a short historical introduction we describe the optimal parametrization of the MSM, especially of the Born approximation, and derive expressions for the one-loop electroweak corrections. Finally a global fit of all relevant experimental data is performed, resulting in fitted values of the top-quark mass, m_t, and strong coupling constant /alpha_s. Allowed range for the value of the Higgs mass, m_H, is discussed. Various details of calculations are described in 16 appendices.
|
1808.04179
|
Alexandra Friesen
|
A. V. Friesen, Yu. L. Kalinovsky, V. D. Toneev
|
Strange matter and kaon to pion ratio in SU(3) PNJL model
|
7 pages, 7 figures
|
Phys. Rev. C 99, 045201 (2019)
|
10.1103/PhysRevC.99.045201
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The behavior of strange matter in the frame of the SU(3)Polyakov-loop
extended Nambu-Jona-Lasinio model including $U_A(1)$ anomaly is considered. We
discuss the appearance of a peak in the ratio of the number of strange mesons
to non-strange mesons known as the "horn". The PNJL model gives a schematic
description of the chiral phase transition and meson properties at finite
temperature and density. Using the model, we can show that the splitting of
kaon and anti-kaon masses appears as a result of introduction of density. This
may explain the difference in the $K^+/\pi^+$ ratio and $K^-/\pi^-$ ratio at
low $\sqrt{s_{NN}}$ and their tendency to the same value at high
$\sqrt{s_{NN}}$. We also show that the rise in the ratio $K^+/\pi^+$ appears
near CEP when we build the $K^+/\pi^+$ ratio along the phase transition diagram
and it can be considered as a critical region signal.
|
[
{
"created": "Mon, 13 Aug 2018 12:48:23 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Aug 2018 15:10:00 GMT",
"version": "v2"
}
] |
2019-04-10
|
[
[
"Friesen",
"A. V.",
""
],
[
"Kalinovsky",
"Yu. L.",
""
],
[
"Toneev",
"V. D.",
""
]
] |
The behavior of strange matter in the frame of the SU(3)Polyakov-loop extended Nambu-Jona-Lasinio model including $U_A(1)$ anomaly is considered. We discuss the appearance of a peak in the ratio of the number of strange mesons to non-strange mesons known as the "horn". The PNJL model gives a schematic description of the chiral phase transition and meson properties at finite temperature and density. Using the model, we can show that the splitting of kaon and anti-kaon masses appears as a result of introduction of density. This may explain the difference in the $K^+/\pi^+$ ratio and $K^-/\pi^-$ ratio at low $\sqrt{s_{NN}}$ and their tendency to the same value at high $\sqrt{s_{NN}}$. We also show that the rise in the ratio $K^+/\pi^+$ appears near CEP when we build the $K^+/\pi^+$ ratio along the phase transition diagram and it can be considered as a critical region signal.
|
1902.08151
|
Alan D. Martin
|
V.A.Khoze, A.D.Martin, M.G.Ryskin
|
BFKL Pomeron and the survival factor
|
11 pages, 5 figures. A contribution to the memorial volume entitled
`From the past to the future - the legacy of Lev Lipatov' edited by J.
Bartels {\it et al}~.}. Draws from arXiv:1809.10406, arXiv:1801.07065
| null | null |
IPPP/19/16
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the absorptive corrections and the rapidity gap survival factor
which are necessary to provide the unitarization of the BFKL Pomeron. In
particular we discuss the role of the enhanced screening diagrams.
|
[
{
"created": "Thu, 21 Feb 2019 17:25:40 GMT",
"version": "v1"
}
] |
2019-02-22
|
[
[
"Khoze",
"V. A.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Ryskin",
"M. G.",
""
]
] |
We consider the absorptive corrections and the rapidity gap survival factor which are necessary to provide the unitarization of the BFKL Pomeron. In particular we discuss the role of the enhanced screening diagrams.
|
1510.07501
|
Howard Baer
|
Howard Baer
|
(Mainly) axion dark matter
|
6 pages plus 3 figures; transcript of plenary talk given at PPC2015
meeting, Deadwood, SD, June 29, 2015
| null |
10.1063/1.4953303
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The strong CP problem of QCD is at heart a problem of naturalness: why is the
F\tilde{F} term highly suppressed in the QCD Lagrangian when it seems necessary
to explain why there are three and not four light pions? The most elegant
solution posits a spontaneously broken Peccei-Quinn (PQ) symmetry which
requires the existence of the axion field a. The axion field settles to the
minimum of its potential thus removing the offensive term but giving rise to
the physical axion whose coherent oscillations can make up the cold dark
matter. Only now are experiments such as ADMX beginning to explore QCD axion
parameter space. Since a bonafide scalar particle-- the Higgs boson-- has been
discovered, one might expect its mass to reside at the axion scale f_a~ 10^{11}
GeV. The Higgs mass is elegantly stabilized by supersymmetry: in this case the
axion is accompanied by its axino and saxion superpartners. Requiring
naturalness also in the electroweak sector implies higgsino-like WIMPs so then
we expect mixed axion-WIMP dark matter. Ultimately we would expect detection of
both an axion and a WIMP while signals for light higgsinos may show up at LHC
and must show up at ILC.
|
[
{
"created": "Mon, 26 Oct 2015 15:00:27 GMT",
"version": "v1"
}
] |
2016-07-27
|
[
[
"Baer",
"Howard",
""
]
] |
The strong CP problem of QCD is at heart a problem of naturalness: why is the F\tilde{F} term highly suppressed in the QCD Lagrangian when it seems necessary to explain why there are three and not four light pions? The most elegant solution posits a spontaneously broken Peccei-Quinn (PQ) symmetry which requires the existence of the axion field a. The axion field settles to the minimum of its potential thus removing the offensive term but giving rise to the physical axion whose coherent oscillations can make up the cold dark matter. Only now are experiments such as ADMX beginning to explore QCD axion parameter space. Since a bonafide scalar particle-- the Higgs boson-- has been discovered, one might expect its mass to reside at the axion scale f_a~ 10^{11} GeV. The Higgs mass is elegantly stabilized by supersymmetry: in this case the axion is accompanied by its axino and saxion superpartners. Requiring naturalness also in the electroweak sector implies higgsino-like WIMPs so then we expect mixed axion-WIMP dark matter. Ultimately we would expect detection of both an axion and a WIMP while signals for light higgsinos may show up at LHC and must show up at ILC.
|
hep-ph/0312337
|
Joao Silva
|
F.J. Botella and Joao P. Silva
|
Bounds on gamma from CP violation measurements in B -> pi+ pi- and B ->
psi K_S
|
11 pages, RevTex 4, 5 eps figures included
|
Phys.Rev. D70 (2004) 096007
|
10.1103/PhysRevD.70.096007
| null |
hep-ph
| null |
We study the determination of gamma from CP-violating observables in B -> pi+
pi- and B -> psi K_S. This determination requires theoretical input to one
combination of hadronic parameters. We show that a mild assumption about this
quantity may allow bounds to be placed on gamma, but we stress the pernicious
effects that an eightfold discrete ambiguity has on such an analysis. The
bounds are discussed as a function of the direct (C) and interference (S)
CP-violating observables obtained from time-dependent B -> pi+ pi- decays, and
their behavior in the presence of new physics effects in B-Bbar mixing is
studied. (V2: Misprints corrected. Slightly improved discussion.)
|
[
{
"created": "Tue, 23 Dec 2003 18:22:41 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Jan 2004 16:47:12 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Botella",
"F. J.",
""
],
[
"Silva",
"Joao P.",
""
]
] |
We study the determination of gamma from CP-violating observables in B -> pi+ pi- and B -> psi K_S. This determination requires theoretical input to one combination of hadronic parameters. We show that a mild assumption about this quantity may allow bounds to be placed on gamma, but we stress the pernicious effects that an eightfold discrete ambiguity has on such an analysis. The bounds are discussed as a function of the direct (C) and interference (S) CP-violating observables obtained from time-dependent B -> pi+ pi- decays, and their behavior in the presence of new physics effects in B-Bbar mixing is studied. (V2: Misprints corrected. Slightly improved discussion.)
|
2207.03712
|
Heikki M\"antysaari
|
Heikki M\"antysaari and Farid Salazar and Bj\"orn Schenke
|
Nuclear geometry at high energy from exclusive vector meson production
|
20 pages, 19 figures
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that when saturation effects are included one obtains a good
description of the exclusive $\mathrm{J}/\psi$ production spectra in ultra
peripheral lead-lead collisions as recently measured by the ALICE Collaboration
at the LHC. As exclusive spectra are sensitive to the spatial distribution of
nuclear matter at small Bjorken-$x$, this implies that gluon saturation effects
modify the impact parameter profile of the target as we move towards small $x$.
In addition to saturation effects, we find a preference for larger nuclear
strong-interaction radii compared to the typical charge radius. We demonstrate
the role of finite photon transverse momentum and the interference between the
cases for which the role of photon emitter and target are switched between the
nuclei. We show that these effects are comparable to the experimental precision
for $p_T$-differential cross sections and as such need to be included when
comparing to LHC data. Finally, the integrated $\mathrm{J}/\psi$ production
cross sections from the LHC and preliminary transverse momentum spectra from
RHIC are shown to prefer calculations with fluctuating nucleon substructure,
although these datasets would require even stronger saturation effects than
predicted from our framework.
|
[
{
"created": "Fri, 8 Jul 2022 07:07:16 GMT",
"version": "v1"
}
] |
2022-07-11
|
[
[
"Mäntysaari",
"Heikki",
""
],
[
"Salazar",
"Farid",
""
],
[
"Schenke",
"Björn",
""
]
] |
We show that when saturation effects are included one obtains a good description of the exclusive $\mathrm{J}/\psi$ production spectra in ultra peripheral lead-lead collisions as recently measured by the ALICE Collaboration at the LHC. As exclusive spectra are sensitive to the spatial distribution of nuclear matter at small Bjorken-$x$, this implies that gluon saturation effects modify the impact parameter profile of the target as we move towards small $x$. In addition to saturation effects, we find a preference for larger nuclear strong-interaction radii compared to the typical charge radius. We demonstrate the role of finite photon transverse momentum and the interference between the cases for which the role of photon emitter and target are switched between the nuclei. We show that these effects are comparable to the experimental precision for $p_T$-differential cross sections and as such need to be included when comparing to LHC data. Finally, the integrated $\mathrm{J}/\psi$ production cross sections from the LHC and preliminary transverse momentum spectra from RHIC are shown to prefer calculations with fluctuating nucleon substructure, although these datasets would require even stronger saturation effects than predicted from our framework.
|
1010.0587
|
Tanja Branz
|
Tanja Branz, Raquel Molina, Eulogio Oset
|
Radiative decays of the Y(3940), Z(3930) and the X(4160) as dynamically
generated resonances
|
13 pages, 3 figures
|
Phys.Rev.D83:114015,2011
|
10.1103/PhysRevD.83.114015
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the radiative decay properties of the charmonium-like X, Y and Z
mesons generated dynamically from vector meson-vector meson interaction in the
framework of a unitarized hidden-gauge formalism. In the present work we
calculate the one- and two-photon decay widths of the hidden-charm Y(3940),
Z(3930) (or X(3915)) and X(4160) mesons in the framework of the vector meson
dominance formalism. We obtain good agreement with experiment in case of the
two photon width of the X(3915) which we associate with the $2^+$ resonance
that we find at 3922 MeV.
|
[
{
"created": "Mon, 4 Oct 2010 13:50:06 GMT",
"version": "v1"
}
] |
2011-06-24
|
[
[
"Branz",
"Tanja",
""
],
[
"Molina",
"Raquel",
""
],
[
"Oset",
"Eulogio",
""
]
] |
We study the radiative decay properties of the charmonium-like X, Y and Z mesons generated dynamically from vector meson-vector meson interaction in the framework of a unitarized hidden-gauge formalism. In the present work we calculate the one- and two-photon decay widths of the hidden-charm Y(3940), Z(3930) (or X(3915)) and X(4160) mesons in the framework of the vector meson dominance formalism. We obtain good agreement with experiment in case of the two photon width of the X(3915) which we associate with the $2^+$ resonance that we find at 3922 MeV.
|
hep-ph/9212208
|
Masaharu Tanabashi
|
Kei-ichi Kondo, Masaharu Tanabashi and Koichi Yamawaki
|
Renormalization in the Gauged Nambu--Jona-Lasinio Model
|
72 pages, 12 figures (not included), LaTeX file, KEK-TH-344/KEK
preprint 92-86/CHIBA-EP-65/DPNU-92-23
|
Prog.Theor.Phys. 89 (1993) 1249-1302
|
10.1143/ptp/89.6.1249
| null |
hep-ph
| null |
Based on the Cornwall-Jackiw-Tomboulis effective potential, we extensively
study nonperturbative renormalization of the gauged Nambu-Jona-Lasinio model in
the ladder approximation with standing gauge coupling. Although the pure
Nambu-Jona-Lasinio model is not renormalizable, presence of the gauge
interaction makes it possible that the theory is renormalized as an interacting
continuum theory at the critical line in the ladder approximation. Extra higher
dimensional operators (``counter terms'') are not needed for the theory to be
renormalized. By virtue of the effective potential approach, the
renormalization (``symmetric renormalization'') is performed in a
phase-independent manner both for the symmetric and the spontaneously broken
phases of the chiral symmetry. We explicitly obtain $\beta$ function having a
nontrivial ultraviolet fixed line for the renormalized coupling as well as the
bare one. In both phases the anomalous dimension is very large ($ \ge 1$)
without discontinuity across the fixed line. Operator product expansion is
explicitly constructed, which is consistent with the large anomalous dimension
owing to the appearance of the nontrivial extra power behavior in the Wilson
coefficient for the unit operator. The symmetric renormalization breaks down at
the critical gauge coupling, which is cured by the generalized renormalization
scheme (``$\tM$-dependent renormalization''). Also emphasized is the formal
resemblance to the four-fermion theory in less than four dimensions which is
renormalizable in $1/N$ expansion.
|
[
{
"created": "Wed, 2 Dec 1992 03:47:31 GMT",
"version": "v1"
}
] |
2017-02-01
|
[
[
"Kondo",
"Kei-ichi",
""
],
[
"Tanabashi",
"Masaharu",
""
],
[
"Yamawaki",
"Koichi",
""
]
] |
Based on the Cornwall-Jackiw-Tomboulis effective potential, we extensively study nonperturbative renormalization of the gauged Nambu-Jona-Lasinio model in the ladder approximation with standing gauge coupling. Although the pure Nambu-Jona-Lasinio model is not renormalizable, presence of the gauge interaction makes it possible that the theory is renormalized as an interacting continuum theory at the critical line in the ladder approximation. Extra higher dimensional operators (``counter terms'') are not needed for the theory to be renormalized. By virtue of the effective potential approach, the renormalization (``symmetric renormalization'') is performed in a phase-independent manner both for the symmetric and the spontaneously broken phases of the chiral symmetry. We explicitly obtain $\beta$ function having a nontrivial ultraviolet fixed line for the renormalized coupling as well as the bare one. In both phases the anomalous dimension is very large ($ \ge 1$) without discontinuity across the fixed line. Operator product expansion is explicitly constructed, which is consistent with the large anomalous dimension owing to the appearance of the nontrivial extra power behavior in the Wilson coefficient for the unit operator. The symmetric renormalization breaks down at the critical gauge coupling, which is cured by the generalized renormalization scheme (``$\tM$-dependent renormalization''). Also emphasized is the formal resemblance to the four-fermion theory in less than four dimensions which is renormalizable in $1/N$ expansion.
|
0808.0028
|
Alfredo Aranda
|
Paolo Amore (U. Colima), Alfredo Aranda (U. Colima), J. Lorenzo
Diaz-Cruz (FCFM-BUAP, Puebla)
|
Discrete Higgs and the Cosmological Constant
|
3 pages, 1 figure, Revtex
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It is proposed that the Higgs vacuum possesses a small-scale structure that
can explain the large discrepancy between the predicted electroweak vacuum
energy density and the observed cosmological constant. An effective Lagrangian
description is employed to obtain modifications to the Standard Model
predictions that can be tested at collider experiments.
|
[
{
"created": "Thu, 31 Jul 2008 21:55:50 GMT",
"version": "v1"
}
] |
2008-08-04
|
[
[
"Amore",
"Paolo",
"",
"U. Colima"
],
[
"Aranda",
"Alfredo",
"",
"U. Colima"
],
[
"Diaz-Cruz",
"J. Lorenzo",
"",
"FCFM-BUAP, Puebla"
]
] |
It is proposed that the Higgs vacuum possesses a small-scale structure that can explain the large discrepancy between the predicted electroweak vacuum energy density and the observed cosmological constant. An effective Lagrangian description is employed to obtain modifications to the Standard Model predictions that can be tested at collider experiments.
|
2002.07347
|
Nicol\'as P\'erez
|
A. E. C\'arcamo Hern\'andez, Yocelyne Hidalgo Vel\'asquez, Sergey
Kovalenko, H. N. Long, Nicol\'as A. P\'erez-Julve and V. V. Vien
|
Fermion spectrum and $g-2$ anomalies in a low scale 3-3-1 model
|
Updated version of this article, new references were added and
changes in the scalar sector
|
Eur. Phys. J. C 81, (2021) 191
|
10.1140/epjc/s10052-021-08974-4.
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a renormalizable theory based on the $SU(3)_C\times SU(3)_L\times
U(1)_X$ gauge symmetry, supplemented by the spontaneously broken $U(1)_{L_g}$
global lepton number symmetry and the $S_3 \times Z_2 $ discrete group, which
successfully describes the observed SM fermion mass and mixing hierarchy. In
our model the top and exotic quarks get tree level masses, whereas the bottom,
charm and strange quarks as well as the tau and muon leptons obtain their
masses from a tree level Universal seesaw mechanism thanks to their mixing with
charged exotic vector like fermions. The masses for the first generation SM
charged fermions are generated from a radiative seesaw mechanism at one loop
level. The light active neutrino masses are produced from a loop level
radiative seesaw mechanism. Our model successfully accommodates the
experimental values for electron and muon anomalous magnetic dipole moments.
|
[
{
"created": "Tue, 18 Feb 2020 02:56:05 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Mar 2020 03:30:33 GMT",
"version": "v2"
},
{
"created": "Thu, 18 Feb 2021 02:55:10 GMT",
"version": "v3"
}
] |
2021-03-08
|
[
[
"Hernández",
"A. E. Cárcamo",
""
],
[
"Velásquez",
"Yocelyne Hidalgo",
""
],
[
"Kovalenko",
"Sergey",
""
],
[
"Long",
"H. N.",
""
],
[
"Pérez-Julve",
"Nicolás A.",
""
],
[
"Vien",
"V. V.",
""
]
] |
We propose a renormalizable theory based on the $SU(3)_C\times SU(3)_L\times U(1)_X$ gauge symmetry, supplemented by the spontaneously broken $U(1)_{L_g}$ global lepton number symmetry and the $S_3 \times Z_2 $ discrete group, which successfully describes the observed SM fermion mass and mixing hierarchy. In our model the top and exotic quarks get tree level masses, whereas the bottom, charm and strange quarks as well as the tau and muon leptons obtain their masses from a tree level Universal seesaw mechanism thanks to their mixing with charged exotic vector like fermions. The masses for the first generation SM charged fermions are generated from a radiative seesaw mechanism at one loop level. The light active neutrino masses are produced from a loop level radiative seesaw mechanism. Our model successfully accommodates the experimental values for electron and muon anomalous magnetic dipole moments.
|
hep-ph/9907283
|
Nikolay I. Root
|
A.E.Bondar, S.I.Eidelman, A.I.Milstein, N.I.Root
|
On the role of $a_1(1260)$ meson in the $\tau\to 4\pi\nu_{\tau}$ decay
|
18 pages, 10 figures, LaTex
|
Phys.Lett.B466:403-407,1999
|
10.1016/S0370-2693(99)01081-3
|
Preprint BudkerINP 99-56, Novosibirsk, 1999
|
hep-ph
| null |
We demonstrate that a simple model successfully describing experimental data
for the process $\epm\to 4\pi$ can also qualitatively account for the data of
CLEOII and ALEPH obtained recently for the decay $\tau\to 4\pi\nu_{\tau}$. The
model is based on the assumption of the $a_1(1260)\pi$ and $\omega\pi$
dominance as intermediate states. Our observation is in contrast with the claim
by ARGUS that the $\rho$-meson signal in the $\tau\to 4\pi\nu_\tau$ decay can
not be explained by the $a_1\pi$ intermediate state.
|
[
{
"created": "Fri, 9 Jul 1999 14:42:09 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Bondar",
"A. E.",
""
],
[
"Eidelman",
"S. I.",
""
],
[
"Milstein",
"A. I.",
""
],
[
"Root",
"N. I.",
""
]
] |
We demonstrate that a simple model successfully describing experimental data for the process $\epm\to 4\pi$ can also qualitatively account for the data of CLEOII and ALEPH obtained recently for the decay $\tau\to 4\pi\nu_{\tau}$. The model is based on the assumption of the $a_1(1260)\pi$ and $\omega\pi$ dominance as intermediate states. Our observation is in contrast with the claim by ARGUS that the $\rho$-meson signal in the $\tau\to 4\pi\nu_\tau$ decay can not be explained by the $a_1\pi$ intermediate state.
|
0711.1743
|
Mikko Laine
|
Y.Burnier, M.Laine, M.Vepsalainen
|
Heavy quarkonium in any channel in resummed hot QCD
|
32 pages. v2: small clarifications and updates; published version
|
JHEP0801:043,2008
|
10.1088/1126-6708/2008/01/043
| null |
hep-ph
| null |
We elaborate on the fact that quarkonium in hot QCD should not be thought of
as a stationary bound state in a temperature-dependent real potential, but as a
short-lived transient, with an exponentially decaying wave function. The reason
is the existence of an imaginary part in the pertinent static potential,
signalling the ``disappearance'', due to inelastic scatterings with hard
particles in the plasma, of the off-shell gluons that bind the quarks together.
By solving the corresponding Schr\"odinger equation, we estimate numerically
the near-threshold spectral functions in scalar, pseudoscalar, vector and axial
vector channels, as a function of the temperature and of the heavy quark mass.
In particular, we point out a subtlety in the determination of the scalar
channel spectral function and, resolving it to the best of our understanding,
suggest that at least in the bottomonium case, a resonance peak can be observed
also in the scalar channel, even though it is strongly suppressed with respect
to the peak in the vector channel. Finally, we plot the physical dilepton
production rate, stressing that despite the eventual disappearance of the
resonance peak from the corresponding spectral function, the quarkonium
contribution to the dilepton rate becomes more pronounced with increasing
temperature, because of the yield from free heavy quarks.
|
[
{
"created": "Mon, 12 Nov 2007 10:55:29 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Jan 2008 09:52:34 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Burnier",
"Y.",
""
],
[
"Laine",
"M.",
""
],
[
"Vepsalainen",
"M.",
""
]
] |
We elaborate on the fact that quarkonium in hot QCD should not be thought of as a stationary bound state in a temperature-dependent real potential, but as a short-lived transient, with an exponentially decaying wave function. The reason is the existence of an imaginary part in the pertinent static potential, signalling the ``disappearance'', due to inelastic scatterings with hard particles in the plasma, of the off-shell gluons that bind the quarks together. By solving the corresponding Schr\"odinger equation, we estimate numerically the near-threshold spectral functions in scalar, pseudoscalar, vector and axial vector channels, as a function of the temperature and of the heavy quark mass. In particular, we point out a subtlety in the determination of the scalar channel spectral function and, resolving it to the best of our understanding, suggest that at least in the bottomonium case, a resonance peak can be observed also in the scalar channel, even though it is strongly suppressed with respect to the peak in the vector channel. Finally, we plot the physical dilepton production rate, stressing that despite the eventual disappearance of the resonance peak from the corresponding spectral function, the quarkonium contribution to the dilepton rate becomes more pronounced with increasing temperature, because of the yield from free heavy quarks.
|
1011.6657
|
Frank Siegert
|
Frank Siegert, Stefan Hoeche, Frank Krauss, Marek Schonherr
|
Multi-jet merging with NLO matrix elements
|
5 pages, 8 figures, Proceedings of the 35th International Conference
of High Energy Physics - ICHEP2010 (July 22-28, 2010, Paris)
|
PoS ICHEP2010:119,2010
| null |
SLAC-PUB-14319
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the algorithm presented here, the ME+PS approach to merge samples of
tree-level matrix elements into inclusive event samples is combined with the
POWHEG method, which includes exact next-to-leading order matrix elements in
the parton shower. The advantages of the method are discussed and the quality
of its implementation in Sherpa is exemplified by results for e+e- annihilation
into hadrons at LEP, for deep-inelastic lepton-nucleon scattering at HERA, for
Drell-Yan lepton-pair production at the Tevatron and for W+W- production at LHC
energies.
|
[
{
"created": "Tue, 30 Nov 2010 19:56:07 GMT",
"version": "v1"
}
] |
2011-09-28
|
[
[
"Siegert",
"Frank",
""
],
[
"Hoeche",
"Stefan",
""
],
[
"Krauss",
"Frank",
""
],
[
"Schonherr",
"Marek",
""
]
] |
In the algorithm presented here, the ME+PS approach to merge samples of tree-level matrix elements into inclusive event samples is combined with the POWHEG method, which includes exact next-to-leading order matrix elements in the parton shower. The advantages of the method are discussed and the quality of its implementation in Sherpa is exemplified by results for e+e- annihilation into hadrons at LEP, for deep-inelastic lepton-nucleon scattering at HERA, for Drell-Yan lepton-pair production at the Tevatron and for W+W- production at LHC energies.
|
1705.01472
|
Keith Thrasher
|
Keith Thrasher
|
Signatures of an $S_3$-Orbifold Higgs Model
|
20 pages, 5 figures, references added in v2
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The lack of new physics at the LHC has sparked renewed interest in theories
of neutral naturalness, in which the Standard Model partners required for
naturalness carry no Standard Model charge. The Twin Higgs was the first of
these theories to be introduced, but recent work has demonstrated it is only an
isolated example in a large class of "orbifold Higgs" models. In this work we
study an orbifold Higgs model resulting from the orbifold projection by the
non-abelian group $S_3$. A model with multiple sectors uncharged under the SM
emerges. Constraints are placed on the model from Higgs phenomenology and the
prospects of finding evidence at colliders are discussed.
|
[
{
"created": "Wed, 3 May 2017 14:55:37 GMT",
"version": "v1"
},
{
"created": "Mon, 15 May 2017 11:59:49 GMT",
"version": "v2"
}
] |
2017-05-16
|
[
[
"Thrasher",
"Keith",
""
]
] |
The lack of new physics at the LHC has sparked renewed interest in theories of neutral naturalness, in which the Standard Model partners required for naturalness carry no Standard Model charge. The Twin Higgs was the first of these theories to be introduced, but recent work has demonstrated it is only an isolated example in a large class of "orbifold Higgs" models. In this work we study an orbifold Higgs model resulting from the orbifold projection by the non-abelian group $S_3$. A model with multiple sectors uncharged under the SM emerges. Constraints are placed on the model from Higgs phenomenology and the prospects of finding evidence at colliders are discussed.
|
1307.8105
|
Richard Gran
|
R. Gran, J. Nieves, F. Sanchez, M. J. Vicente Vacas
|
Neutrino-nucleus quasi-elastic and 2p2h interactions up to 10 GeV
|
10 pages, 5 figures, 1 table, updated with changes from PRD review
process
|
Phys. Rev. D 88, 113007 (2013)
|
10.1103/PhysRevD.88.113007
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We extend to 10 GeV results from a microscopic calculation of charged-current
neutrino-nucleus reactions that do not produce a pion in the final state. For
the class of events coming from neutrino interactions with two nucleons
producing two holes (2p2h), limiting the calculation to three-momentum
transfers less than 1.2 GeV produces a two dimensional distribution in momentum
and energy transfer that is roughly constant as a function of energy. The cross
section for 2p2h interactions scales with the number of nucleons for isoscalar
nuclei, similar to the quasi-elastic (QE) cross section. When limited to
momentum transfers below 1.2 GeV, the cross section is 26% of the QE cross
section at 3 GeV, but 14% if we neglect a Delta1232 resonance absorption
component. The same quantities are 33% and 17% for anti-neutrinos. For the
quasi-elastic interactions, the full nuclear model with long range correlations
produces an even larger, but approximately constant distortion of the shape of
the four-momentum transfer at all energies above 2 GeV. The 2p2h enhancement
and long-range correlation distortions to the cross section for these
interactions is significant enough they should be observable in precision
experiments to measure neutrino oscillations and neutrino interactions at these
energies, but also balance out and produce less total distortion than each
effect does individually.
|
[
{
"created": "Tue, 30 Jul 2013 19:51:59 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Feb 2014 16:20:14 GMT",
"version": "v2"
}
] |
2014-02-17
|
[
[
"Gran",
"R.",
""
],
[
"Nieves",
"J.",
""
],
[
"Sanchez",
"F.",
""
],
[
"Vacas",
"M. J. Vicente",
""
]
] |
We extend to 10 GeV results from a microscopic calculation of charged-current neutrino-nucleus reactions that do not produce a pion in the final state. For the class of events coming from neutrino interactions with two nucleons producing two holes (2p2h), limiting the calculation to three-momentum transfers less than 1.2 GeV produces a two dimensional distribution in momentum and energy transfer that is roughly constant as a function of energy. The cross section for 2p2h interactions scales with the number of nucleons for isoscalar nuclei, similar to the quasi-elastic (QE) cross section. When limited to momentum transfers below 1.2 GeV, the cross section is 26% of the QE cross section at 3 GeV, but 14% if we neglect a Delta1232 resonance absorption component. The same quantities are 33% and 17% for anti-neutrinos. For the quasi-elastic interactions, the full nuclear model with long range correlations produces an even larger, but approximately constant distortion of the shape of the four-momentum transfer at all energies above 2 GeV. The 2p2h enhancement and long-range correlation distortions to the cross section for these interactions is significant enough they should be observable in precision experiments to measure neutrino oscillations and neutrino interactions at these energies, but also balance out and produce less total distortion than each effect does individually.
|
2101.01471
|
Alexander Manashov
|
V. M. Braun, A. N. Manashov, S. Moch, M. Strohmaier
|
Three-loop off-forward evolution kernel for axial-vector operators in
Larin's scheme
|
9 pages
|
Phys. Rev. D 103, 094018 (2021)
|
10.1103/PhysRevD.103.094018
|
DESY-20-236
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Evolution equations for leading twist operators in high orders of
perturbation theory can be restored from the spectrum of anomalous dimensions
and the calculation of the special conformal anomaly at one order less using
conformal symmetry of QCD at the Wilson-Fisher critical point at non-integer
$d=4-2\epsilon$ space-time dimensions. In this work we generalize this
technique to axial-vector operators. We calculate the corresponding three-loop
evolution kernels in Larin's scheme and derive explicit expressions for the
finite renormalization kernel that describes the difference to the vector case
to restore the conventional ${\overline{\mathrm{MS}}}$-scheme. The results are
directly applicable to deeply-virtual Compton scattering and the transition
form factor $\gamma^*\gamma\to\pi$.
|
[
{
"created": "Tue, 5 Jan 2021 12:05:53 GMT",
"version": "v1"
}
] |
2021-05-26
|
[
[
"Braun",
"V. M.",
""
],
[
"Manashov",
"A. N.",
""
],
[
"Moch",
"S.",
""
],
[
"Strohmaier",
"M.",
""
]
] |
Evolution equations for leading twist operators in high orders of perturbation theory can be restored from the spectrum of anomalous dimensions and the calculation of the special conformal anomaly at one order less using conformal symmetry of QCD at the Wilson-Fisher critical point at non-integer $d=4-2\epsilon$ space-time dimensions. In this work we generalize this technique to axial-vector operators. We calculate the corresponding three-loop evolution kernels in Larin's scheme and derive explicit expressions for the finite renormalization kernel that describes the difference to the vector case to restore the conventional ${\overline{\mathrm{MS}}}$-scheme. The results are directly applicable to deeply-virtual Compton scattering and the transition form factor $\gamma^*\gamma\to\pi$.
|
1308.5912
|
Jian Zhou Mr.
|
Jian Zhou
|
Transverse single spin asymmetries at small x and the anomalous magnetic
moment
|
8 pages,v2
|
Phys. Rev. D 89, 074050 (2014)
|
10.1103/PhysRevD.89.074050
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that in the Mclerran-Venugopalan model, an axial asymmetrical valence
quark distributions in the transverse plane of a transversely polarized proton
can give rise to a spin dependent odderon. Such polarized odderon is
responsible for the transverse single spin asymmetries(SSAs) for jet production
in the backward region of pp collisions and open charm production in
semi-inclusive DIS process.
|
[
{
"created": "Tue, 27 Aug 2013 16:15:02 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Apr 2014 11:02:58 GMT",
"version": "v2"
}
] |
2014-05-07
|
[
[
"Zhou",
"Jian",
""
]
] |
We show that in the Mclerran-Venugopalan model, an axial asymmetrical valence quark distributions in the transverse plane of a transversely polarized proton can give rise to a spin dependent odderon. Such polarized odderon is responsible for the transverse single spin asymmetries(SSAs) for jet production in the backward region of pp collisions and open charm production in semi-inclusive DIS process.
|
hep-ph/0503156
|
Benoit Vanderheyden
|
Benoit Vanderheyden and A. D. Jackson
|
Temperature dependence in random matrix models with pairing condensates
|
8 pages, revtex4. v2: typos corrected in references
|
Phys.Rev. D72 (2005) 016003
|
10.1103/PhysRevD.72.016003
| null |
hep-ph
| null |
We address a number of issues raised by a manuscript of Klein, Toublan, and
Verbaarschot (hep-ph/0405180) in which the authors introduce a random matrix
model for QCD with two colors, two flavors, and fermions in the fundamental
representation. Their inclusion of temperature terms differs from the approach
adopted in previous work on this problem (Phys. Rev. D 64, 074016 (2001).) We
demonstrate that the two approaches are related by a transformation that leaves
the thermodynamic potential invariant and which therefore has no effect on
physical observables.
|
[
{
"created": "Wed, 16 Mar 2005 15:56:06 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Mar 2005 12:15:04 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Vanderheyden",
"Benoit",
""
],
[
"Jackson",
"A. D.",
""
]
] |
We address a number of issues raised by a manuscript of Klein, Toublan, and Verbaarschot (hep-ph/0405180) in which the authors introduce a random matrix model for QCD with two colors, two flavors, and fermions in the fundamental representation. Their inclusion of temperature terms differs from the approach adopted in previous work on this problem (Phys. Rev. D 64, 074016 (2001).) We demonstrate that the two approaches are related by a transformation that leaves the thermodynamic potential invariant and which therefore has no effect on physical observables.
|
2211.02427
|
Prashant Shukla
|
Hariom Sogarwal and Prashant Shukla
|
Inclusive fluxes of secondary air-shower particles
|
27 pages, 18 figures
| null | null | null |
hep-ph astro-ph.HE hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
The particle showers produced in the atmosphere due to the interactions of
primary cosmic particles require a thorough understanding in the backdrop of
searches for rare interactions. In this work, we made a comprehensive study of
air shower simulations using various combinations of hadronic models and
particle transport code of the CORSIKA package. The primary proton and helium
distributions are taken as power law which are scaled to match the measured
flux in balloon experiments at the top of atmosphere. The shower simulation
includes production, transport, and decays of secondaries up to the ground
level. In this study, we focus on the bulk of the spectra and particles which
is computationally intensive and hence parallel processing of events is done on
computer cluster. We provide a way to normalize the simulation results to be
compared with the ground-based measurements namely, single and multiple muon
yields and their charge ratios as a function of zenith angle and momentum. This
provides a basis for comparisons among the six model combinations used in this
study and the differences are outlined. Most of the hadronic models in CORSIKA
produce the bulk ground based measurements fairly well. We use one of the best
model combinations to quantitatively predict the absolute and relative yields
of various particles at ground level as well as their correlations with
primaries and with each other. The leptonic ratios are obtained as a function
of energy and zenith angle which are important inputs for the neutrino
oscillation physics.
|
[
{
"created": "Fri, 4 Nov 2022 13:06:10 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Jan 2023 12:55:40 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Feb 2024 08:00:29 GMT",
"version": "v3"
}
] |
2024-02-15
|
[
[
"Sogarwal",
"Hariom",
""
],
[
"Shukla",
"Prashant",
""
]
] |
The particle showers produced in the atmosphere due to the interactions of primary cosmic particles require a thorough understanding in the backdrop of searches for rare interactions. In this work, we made a comprehensive study of air shower simulations using various combinations of hadronic models and particle transport code of the CORSIKA package. The primary proton and helium distributions are taken as power law which are scaled to match the measured flux in balloon experiments at the top of atmosphere. The shower simulation includes production, transport, and decays of secondaries up to the ground level. In this study, we focus on the bulk of the spectra and particles which is computationally intensive and hence parallel processing of events is done on computer cluster. We provide a way to normalize the simulation results to be compared with the ground-based measurements namely, single and multiple muon yields and their charge ratios as a function of zenith angle and momentum. This provides a basis for comparisons among the six model combinations used in this study and the differences are outlined. Most of the hadronic models in CORSIKA produce the bulk ground based measurements fairly well. We use one of the best model combinations to quantitatively predict the absolute and relative yields of various particles at ground level as well as their correlations with primaries and with each other. The leptonic ratios are obtained as a function of energy and zenith angle which are important inputs for the neutrino oscillation physics.
|
0902.0377
|
Hannes Jung
|
J. Bartels (U. Hamburg), K. Borras (DESY), G. Gustafson (U. Hamburg,
U. Lund), H. Jung (DESY, U. Antwerp), K. Kutak (DESY), S. Levonian (DESY), J.
Mnich (DESY), A. Achilli, J. L. Albacete, M. G. Albrow, L. Alvarez-Gaum\'e,
F. Ambroglini, E. Avsar, R. Baier, P. Bartalini, J. Bartels, F.W. Bopp, W.
Broniowski, R. Brower, A. Bunyatyan, W. Busza, H. Caines, M. Chojnacki, C.
Ciocca, A. Cooper-Sarkar, T. Cs\"org\H{o}, A. De Roeck, M. Diehl, M. Djuric,
I.M. Dremin, W. Ehrenfeld, R. Engel, L. Fan\`o, R. Field, Ch. Flensburg, W.
Florkowski, C. G\'omez, L. Garbini, R. Godbole, K. Golec-Biernat, A. Grau, K.
Hatakeyama, F.Hautmann, S. Heinemeyer, K. Homma, T. Hurth, E. Iancu, K.
Itakura, L.L. Jenkovszky, H. Jung, A.B. Kaidalov, D. Kar, J. Katzy, V.A.
Khoze, A. Kisiel, J.-L. Kneur, T. Kodama, T. Koide, E. Kokoulina, K. Kolar,
A.V. Koshelkin, Y V. Kovchegov, A. Kropivnitskaya, K. Kutak, A. Kutov, M.
Lancaster, G. Li, L. Liu, L.N. Lipatov, M.V.T. Machado, G. Marchesini, C.
Marquet, L. McLerran, Y. Mehtar-Tani, M. Yu, W. J. Metzger, A. Meyer, XU
Mingmei, S. Moch, Z. Nagy, M. Nagy, J.Nemchik, S. Ostapchenko, S.S. Padula,
G. Pancheri, K. Papageorgiou, T. Pierog, O.I. Piskounova, J. Ranft, S.
Roesler, J. Rojo, V. Ryadovikov, M.G. Ryskin, A. Sabio Vera, A. Savin, T.
Shears, R. Shehzadi, Y. N. Srivastava, J. Stirling, M. Strassler, M. Sumbera,
M. Ta\v{s}evsk\'y A. Taliotis, C-I Tan, A. Tavanfar, P. Thompson, M. Tokarev,
P. Travnicek, D. Treleani, G. Tsiledakis, I. Tsukerman, M. A. V\'azquez-Mozo,
P. van Mechelen, D. Wegener, G. Weiglein, Ch. White, D. Wicke M. Wing, G.
Wolschin, R. Yoshida, I. Zborovsk
|
Proceedings of the 38th International Symposium on Multiparticle
Dynamics (ISMD08)
|
Edited by: J. Bartels, K. Borras, G. Gustafson, H. Jung, K. Kutak, S.
Levonian, and J. Mnich
| null | null |
DESY-PROC-2009-01
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Proceedings of ISMD08
|
[
{
"created": "Mon, 2 Feb 2009 20:48:08 GMT",
"version": "v1"
}
] |
2019-08-17
|
[
[
"Bartels",
"J.",
"",
"U. Hamburg"
],
[
"Borras",
"K.",
"",
"DESY"
],
[
"Gustafson",
"G.",
"",
"U. Hamburg,\n U. Lund"
],
[
"Jung",
"H.",
"",
"DESY, U. Antwerp"
],
[
"Kutak",
"K.",
"",
"DESY"
],
[
"Levonian",
"S.",
"",
"DESY"
],
[
"Mnich",
"J.",
"",
"DESY"
],
[
"Achilli",
"A.",
"",
"U. Hamburg"
],
[
"Albacete",
"J. L.",
"",
"U. Hamburg"
],
[
"Albrow",
"M. G.",
"",
"U. Hamburg"
],
[
"Alvarez-Gaumé",
"L.",
"",
"U. Hamburg"
],
[
"Ambroglini",
"F.",
"",
"U. Hamburg"
],
[
"Avsar",
"E.",
"",
"U. Hamburg"
],
[
"Baier",
"R.",
"",
"U. Hamburg"
],
[
"Bartalini",
"P.",
"",
"U. Hamburg"
],
[
"Bartels",
"J.",
"",
"U. Hamburg"
],
[
"Bopp",
"F. W.",
"",
"DESY, U. Antwerp"
],
[
"Broniowski",
"W.",
"",
"DESY, U. Antwerp"
],
[
"Brower",
"R.",
"",
"DESY, U. Antwerp"
],
[
"Bunyatyan",
"A.",
"",
"DESY, U. Antwerp"
],
[
"Busza",
"W.",
"",
"DESY, U. Antwerp"
],
[
"Caines",
"H.",
"",
"DESY, U. Antwerp"
],
[
"Chojnacki",
"M.",
"",
"DESY, U. Antwerp"
],
[
"Ciocca",
"C.",
"",
"DESY, U. Antwerp"
],
[
"Cooper-Sarkar",
"A.",
"",
"DESY, U. Antwerp"
],
[
"Csörgő",
"T.",
"",
"DESY, U. Antwerp"
],
[
"De Roeck",
"A.",
"",
"DESY, U. Antwerp"
],
[
"Diehl",
"M.",
"",
"DESY, U. Antwerp"
],
[
"Djuric",
"M.",
"",
"DESY, U. Antwerp"
],
[
"Dremin",
"I. M.",
"",
"DESY, U. Antwerp"
],
[
"Ehrenfeld",
"W.",
"",
"DESY, U. Antwerp"
],
[
"Engel",
"R.",
"",
"DESY, U. Antwerp"
],
[
"Fanò",
"L.",
"",
"DESY, U. Antwerp"
],
[
"Field",
"R.",
"",
"DESY, U. Antwerp"
],
[
"Flensburg",
"Ch.",
"",
"DESY, U. Antwerp"
],
[
"Florkowski",
"W.",
"",
"DESY, U. Antwerp"
],
[
"Gómez",
"C.",
"",
"DESY, U. Antwerp"
],
[
"Garbini",
"L.",
"",
"DESY, U. Antwerp"
],
[
"Godbole",
"R.",
"",
"DESY, U. Antwerp"
],
[
"Golec-Biernat",
"K.",
"",
"DESY, U. Antwerp"
],
[
"Grau",
"A.",
"",
"DESY, U. Antwerp"
],
[
"Hatakeyama",
"K.",
"",
"DESY, U. Antwerp"
],
[
"Hautmann",
"F.",
"",
"DESY, U. Antwerp"
],
[
"Heinemeyer",
"S.",
"",
"DESY, U. Antwerp"
],
[
"Homma",
"K.",
"",
"DESY, U. Antwerp"
],
[
"Hurth",
"T.",
"",
"DESY, U. Antwerp"
],
[
"Iancu",
"E.",
"",
"DESY, U. Antwerp"
],
[
"Itakura",
"K.",
"",
"DESY, U. Antwerp"
],
[
"Jenkovszky",
"L. L.",
"",
"DESY, U. Antwerp"
],
[
"Jung",
"H.",
"",
"DESY, U. Antwerp"
],
[
"Kaidalov",
"A. B.",
"",
"DESY"
],
[
"Kar",
"D.",
"",
"DESY"
],
[
"Katzy",
"J.",
"",
"DESY"
],
[
"Khoze",
"V. A.",
"",
"DESY"
],
[
"Kisiel",
"A.",
"",
"DESY"
],
[
"Kneur",
"J. -L.",
"",
"DESY"
],
[
"Kodama",
"T.",
"",
"DESY"
],
[
"Koide",
"T.",
"",
"DESY"
],
[
"Kokoulina",
"E.",
"",
"DESY"
],
[
"Kolar",
"K.",
"",
"DESY"
],
[
"Koshelkin",
"A. V.",
"",
"DESY"
],
[
"Kovchegov",
"Y V.",
"",
"DESY"
],
[
"Kropivnitskaya",
"A.",
"",
"DESY"
],
[
"Kutak",
"K.",
"",
"DESY"
],
[
"Kutov",
"A.",
""
],
[
"Lancaster",
"M.",
""
],
[
"Li",
"G.",
""
],
[
"Liu",
"L.",
""
],
[
"Lipatov",
"L. N.",
""
],
[
"Machado",
"M. V. T.",
""
],
[
"Marchesini",
"G.",
""
],
[
"Marquet",
"C.",
""
],
[
"McLerran",
"L.",
""
],
[
"Mehtar-Tani",
"Y.",
""
],
[
"Yu",
"M.",
""
],
[
"Metzger",
"W. J.",
""
],
[
"Meyer",
"A.",
""
],
[
"Mingmei",
"XU",
""
],
[
"Moch",
"S.",
""
],
[
"Nagy",
"Z.",
""
],
[
"Nagy",
"M.",
""
],
[
"Nemchik",
"J.",
""
],
[
"Ostapchenko",
"S.",
""
],
[
"Padula",
"S. S.",
""
],
[
"Pancheri",
"G.",
""
],
[
"Papageorgiou",
"K.",
""
],
[
"Pierog",
"T.",
""
],
[
"Piskounova",
"O. I.",
""
],
[
"Ranft",
"J.",
""
],
[
"Roesler",
"S.",
""
],
[
"Rojo",
"J.",
""
],
[
"Ryadovikov",
"V.",
""
],
[
"Ryskin",
"M. G.",
""
],
[
"Vera",
"A. Sabio",
""
],
[
"Savin",
"A.",
""
],
[
"Shears",
"T.",
""
],
[
"Shehzadi",
"R.",
""
],
[
"Srivastava",
"Y. N.",
""
],
[
"Stirling",
"J.",
""
],
[
"Strassler",
"M.",
""
],
[
"Sumbera",
"M.",
""
],
[
"Taliotis",
"M. Taševský A.",
""
],
[
"Tan",
"C-I",
""
],
[
"Tavanfar",
"A.",
""
],
[
"Thompson",
"P.",
""
],
[
"Tokarev",
"M.",
""
],
[
"Travnicek",
"P.",
""
],
[
"Treleani",
"D.",
""
],
[
"Tsiledakis",
"G.",
""
],
[
"Tsukerman",
"I.",
""
],
[
"Vázquez-Mozo",
"M. A.",
""
],
[
"van Mechelen",
"P.",
""
],
[
"Wegener",
"D.",
""
],
[
"Weiglein",
"G.",
""
],
[
"White",
"Ch.",
""
],
[
"Wing",
"D. Wicke M.",
""
],
[
"Wolschin",
"G.",
""
],
[
"Yoshida",
"R.",
""
],
[
"Zborovsk",
"I.",
""
]
] |
Proceedings of ISMD08
|
2112.04523
|
Anil Thapa
|
Rahool Kumar Barman, Ritu Dcruz, Anil Thapa
|
Neutrino masses and magnetic moments of electron and muon in the Zee
Model
|
31pages+ references, plots updated, added references, matches
published version
| null |
10.1007/JHEP03(2022)183
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We explore parameter space in the Zee Model to resolve the long-standing
tension of the electron and muon anomalous magnetic moment (AMM). The model
comprises a second Higgs doublet and a charged singlet at electroweak scale and
generates Majorana neutrino masses at one-loop level; the neutral partner of
the $SU(2)_L$ doublet contributes to the AMM of electron and muon via one loop
and two-loop corrections. We propose two minimal flavor structures that can
explain these anomalies while fitting the neutrino oscillation data. We find
that the neutral Higgs resides in the mass range of roughly 10-300 GeV or 1-30
GeV, depending on the flavor structures. The model is consistent with
constraints from colliders, electroweak precision data, and lepton flavor
violation. To be comprehensive, we examine the constraints from the electric
dipole moment (EDM) and find a region of parameter space that gives a sizable
contribution to muon EDM while simultaneously giving corrections to muon AMM.
In addition to the light scalar, the two charged scalars with masses as low as
100 GeV can induce nonstandard interactions $\varepsilon_{ee}$ as large as
$8\%$, potentially hinting at new physics. We also investigate the projected
capability of future lepton colliders to probe the currently allowed parameter
space consistent with both electron and muon AMMs via direct searches in the
$\ell^{+}\ell^{-}\to \ell^{+}\ell^{-}(H \to \ell^{+}\ell^{-})$ channel.
|
[
{
"created": "Wed, 8 Dec 2021 19:00:53 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Apr 2022 18:43:31 GMT",
"version": "v2"
}
] |
2022-04-20
|
[
[
"Barman",
"Rahool Kumar",
""
],
[
"Dcruz",
"Ritu",
""
],
[
"Thapa",
"Anil",
""
]
] |
We explore parameter space in the Zee Model to resolve the long-standing tension of the electron and muon anomalous magnetic moment (AMM). The model comprises a second Higgs doublet and a charged singlet at electroweak scale and generates Majorana neutrino masses at one-loop level; the neutral partner of the $SU(2)_L$ doublet contributes to the AMM of electron and muon via one loop and two-loop corrections. We propose two minimal flavor structures that can explain these anomalies while fitting the neutrino oscillation data. We find that the neutral Higgs resides in the mass range of roughly 10-300 GeV or 1-30 GeV, depending on the flavor structures. The model is consistent with constraints from colliders, electroweak precision data, and lepton flavor violation. To be comprehensive, we examine the constraints from the electric dipole moment (EDM) and find a region of parameter space that gives a sizable contribution to muon EDM while simultaneously giving corrections to muon AMM. In addition to the light scalar, the two charged scalars with masses as low as 100 GeV can induce nonstandard interactions $\varepsilon_{ee}$ as large as $8\%$, potentially hinting at new physics. We also investigate the projected capability of future lepton colliders to probe the currently allowed parameter space consistent with both electron and muon AMMs via direct searches in the $\ell^{+}\ell^{-}\to \ell^{+}\ell^{-}(H \to \ell^{+}\ell^{-})$ channel.
|
2404.01927
|
Renato Zamora
|
R. Cadiz, M. Loewe, R. Zamora
|
Electric corrections to $\pi$-$\pi$ scattering lenghts in the linear
sigma model
|
9 pages, 4 figures
| null | null | null |
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
In this article we analyze the role of an external electric field, in the
weak field approximation, on $\pi$-$\pi$ scattering lengths. The discussion is
presented in the frame of the linear sigma model. To achieve this, we take into
account all one-loop corrections in the $s$, $t$, and $u$ channels associated
with the insertion of a Schwinger propagator for charged pions, focusing on the
region characterized by small values of the electric field. Furthermore, one of
the novelties of our work is the explicit calculation of box diagrams, which
were previously overlooked in discussions regarding magnetic corrections. It
turns out that the electric field corrections have an opposite effect with
respect to magnetic corrections calculated previously in the literature.
|
[
{
"created": "Tue, 2 Apr 2024 13:20:33 GMT",
"version": "v1"
}
] |
2024-04-03
|
[
[
"Cadiz",
"R.",
""
],
[
"Loewe",
"M.",
""
],
[
"Zamora",
"R.",
""
]
] |
In this article we analyze the role of an external electric field, in the weak field approximation, on $\pi$-$\pi$ scattering lengths. The discussion is presented in the frame of the linear sigma model. To achieve this, we take into account all one-loop corrections in the $s$, $t$, and $u$ channels associated with the insertion of a Schwinger propagator for charged pions, focusing on the region characterized by small values of the electric field. Furthermore, one of the novelties of our work is the explicit calculation of box diagrams, which were previously overlooked in discussions regarding magnetic corrections. It turns out that the electric field corrections have an opposite effect with respect to magnetic corrections calculated previously in the literature.
|
hep-ph/0006316
|
Tetsuo Sawada
|
Tetsuo Sawada
|
Interference pattern of the Coulomb and the strong Van der Waals forces
in p-p scattering
|
11 pages, 7 eps figures, Latex, conference: ICHEP2000
| null | null |
NUP-A-2000-13
|
hep-ph
| null |
In order to confirm the strong Van der Waals force in the nucleon-nucleon
interaction, it is proposed to measure precisely the angular distribution of
the cross section of the low energy ($T_{lab}=20 \sim 30MeV.$) proton-proton
scattering. By using the spectrum of the long range interaction obtained from
the analysis of the phase shift data of the S-wave of the p-p scattering, a
characteristic interference pattern, which arises from the repulsive Coulomb
and the attractive strong Van der Waals forces, is predicted. The pattern has a
dip at $theta_{c.m.}=14^{\circ}$ with the depth around one per cent.
|
[
{
"created": "Wed, 28 Jun 2000 10:07:11 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Sawada",
"Tetsuo",
""
]
] |
In order to confirm the strong Van der Waals force in the nucleon-nucleon interaction, it is proposed to measure precisely the angular distribution of the cross section of the low energy ($T_{lab}=20 \sim 30MeV.$) proton-proton scattering. By using the spectrum of the long range interaction obtained from the analysis of the phase shift data of the S-wave of the p-p scattering, a characteristic interference pattern, which arises from the repulsive Coulomb and the attractive strong Van der Waals forces, is predicted. The pattern has a dip at $theta_{c.m.}=14^{\circ}$ with the depth around one per cent.
|
hep-ph/0611247
|
Torbjorn Sjostrand
|
Torbj\"orn Sj\"ostrand
|
Monte Carlo Generators
|
23 pages, lectures presented at the 2006 European School of
High-Energy Physics, Aronsborg, Sweden, 18 June -- 1 July 2006
| null | null |
CERN-LCGAPP-2006-06
|
hep-ph
| null |
The structure of events in high-energy collisions is complex and not
predictable from first principles. Event generators allow the problem to be
subdivided into more manageable pieces, some of which can be described from
first principles, while others need to be based on appropriate models with
parameters tuned to data. In these lectures we provide an overview, discuss how
matrix elements are used, introduce the machinery for initial- and final-state
parton showers, explain how matrix elements and parton showers can be combined
for optimal accuracy, introduce the concept of multiple parton--parton
interactions, comment briefly on the hadronization issue, and provide an
outlook for the future.
|
[
{
"created": "Sat, 18 Nov 2006 12:55:49 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Sjöstrand",
"Torbjörn",
""
]
] |
The structure of events in high-energy collisions is complex and not predictable from first principles. Event generators allow the problem to be subdivided into more manageable pieces, some of which can be described from first principles, while others need to be based on appropriate models with parameters tuned to data. In these lectures we provide an overview, discuss how matrix elements are used, introduce the machinery for initial- and final-state parton showers, explain how matrix elements and parton showers can be combined for optimal accuracy, introduce the concept of multiple parton--parton interactions, comment briefly on the hadronization issue, and provide an outlook for the future.
|
1310.2016
|
David Dudal
|
D. Dudal, M.S. Guimaraes, S.P. Sorella
|
Pad\'e approximation and glueball mass estimates in 3d and 4d with N_c =
2,3 colors
|
11 pages, 5 .png figures. v2: extra figure, calculational details and
references; improved presentation and title. Version to appear in Phys.Lett.B
| null |
10.1016/j.physletb.2014.03.056
| null |
hep-ph hep-lat hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A Pad\'e approximation approach, rooted in an infrared moment technique, is
employed to provide mass estimates for various glueball states in pure gauge
theories. The main input in this analysis are theoretically well-motivated fits
to lattice gluon propagator data, which are by now available for both SU(2) and
SU(3) in 3 and 4 space-time dimensions. We construct appropriate gauge
invariant and Lorentz covariant operators in the (pseudo)scalar and
(pseudo)tensor sector. Our estimates compare reasonably well with a variety of
lattice sources directly aimed at extracting glueball masses.
|
[
{
"created": "Tue, 8 Oct 2013 06:57:08 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Apr 2014 11:13:08 GMT",
"version": "v2"
}
] |
2015-06-17
|
[
[
"Dudal",
"D.",
""
],
[
"Guimaraes",
"M. S.",
""
],
[
"Sorella",
"S. P.",
""
]
] |
A Pad\'e approximation approach, rooted in an infrared moment technique, is employed to provide mass estimates for various glueball states in pure gauge theories. The main input in this analysis are theoretically well-motivated fits to lattice gluon propagator data, which are by now available for both SU(2) and SU(3) in 3 and 4 space-time dimensions. We construct appropriate gauge invariant and Lorentz covariant operators in the (pseudo)scalar and (pseudo)tensor sector. Our estimates compare reasonably well with a variety of lattice sources directly aimed at extracting glueball masses.
|
2306.01578
|
Atri Bhattacharya
|
Atri Bhattacharya, Felix Kling, Ina Sarcevic and Anna M. Stasto
|
Forward Neutrinos from Charm at Large Hadron Collider
|
v2: version as published, 29 pages, 12 figures
|
Physical Review D 109, 014040 (2024)
|
10.1103/PhysRevD.109.014040
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The currently operating FASER experiment and the planned Forward Physics
Facility (FPF) will detect a large number of neutrinos produced in
proton-proton collisions at the LHC. In this work, we estimate neutrino fluxes
at these detectors from charm meson decays, which will be particularly
important for the $\nu_e$ and $\nu_\tau$ channels. We make prediction using
both the next-to-leading order collinear factorization and the
$k_T$-factorization approaches to model the production of charm quarks as well
as different schemes to model their hadronization into charm hadrons. In
particular, we emphasize that a sophisticated modeling of hadronization
involving beam remnants is needed for predictions at FASER and FPF due to the
sensitivity to the charm hadron production at low transverse momenta and very
forward rapidity. As example, we use the string fragmentation approach
implemented in \texttt{Pythia~8}. While both standard fragmentation functions
and \texttt{Pythia~8} are able to describe LHCb data, we find that
\texttt{Pythia~8} predicts significantly higher rate of high energy neutrinos,
highlighting the importance of using the correct hadronization model when
making predictions.
|
[
{
"created": "Fri, 2 Jun 2023 14:45:53 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Feb 2024 10:27:33 GMT",
"version": "v2"
}
] |
2024-02-05
|
[
[
"Bhattacharya",
"Atri",
""
],
[
"Kling",
"Felix",
""
],
[
"Sarcevic",
"Ina",
""
],
[
"Stasto",
"Anna M.",
""
]
] |
The currently operating FASER experiment and the planned Forward Physics Facility (FPF) will detect a large number of neutrinos produced in proton-proton collisions at the LHC. In this work, we estimate neutrino fluxes at these detectors from charm meson decays, which will be particularly important for the $\nu_e$ and $\nu_\tau$ channels. We make prediction using both the next-to-leading order collinear factorization and the $k_T$-factorization approaches to model the production of charm quarks as well as different schemes to model their hadronization into charm hadrons. In particular, we emphasize that a sophisticated modeling of hadronization involving beam remnants is needed for predictions at FASER and FPF due to the sensitivity to the charm hadron production at low transverse momenta and very forward rapidity. As example, we use the string fragmentation approach implemented in \texttt{Pythia~8}. While both standard fragmentation functions and \texttt{Pythia~8} are able to describe LHCb data, we find that \texttt{Pythia~8} predicts significantly higher rate of high energy neutrinos, highlighting the importance of using the correct hadronization model when making predictions.
|
2403.07512
|
G\'abor B\'ir\'o
|
G\'abor B\'ir\'o, Leonid Serkin, Guy Pai\'c, Gergely G\'abor
Barnaf\"oldi
|
Is there (no) collective flow in pp collisions?
| null | null | null | null |
hep-ph nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
The transverse momentum spectra and their multiplicity dependence serve as
key tools for extracting parameters that can be compared with theoretical
models. This comparison aims to establish the behaviour and nature of the
system created in the collision. Over the past decade, the scientific community
has extensively studied the possibility of a system analogous to quark-gluon
plasma, predicted in heavy nuclei collisions, also existing in collisions
involving light nuclei and proton-proton collisions. We have reanalysed the
experimental data published by the ALICE Collaboration at the LHC, exploring a
seemingly universal feature of transverse momentum spectra of charged
particles. We have identified a specific range where the contribution of the
hard part is nonexistent for the studied multiplicities. We present the
dependence of the mean transverse momenta obtained in the soft and soft+hard
(mixed) parts and discuss the results in the context of the ongoing controversy
regarding the existence of collectivity in small systems. Finally, we also
discuss possible refinements of the analyses concerning the use of statistical
parameters of higher order, aimed at better distinguishing the agreement of
theoretical and Monte Carlo models with the data.
|
[
{
"created": "Tue, 12 Mar 2024 10:47:17 GMT",
"version": "v1"
}
] |
2024-03-15
|
[
[
"Bíró",
"Gábor",
""
],
[
"Serkin",
"Leonid",
""
],
[
"Paić",
"Guy",
""
],
[
"Barnaföldi",
"Gergely Gábor",
""
]
] |
The transverse momentum spectra and their multiplicity dependence serve as key tools for extracting parameters that can be compared with theoretical models. This comparison aims to establish the behaviour and nature of the system created in the collision. Over the past decade, the scientific community has extensively studied the possibility of a system analogous to quark-gluon plasma, predicted in heavy nuclei collisions, also existing in collisions involving light nuclei and proton-proton collisions. We have reanalysed the experimental data published by the ALICE Collaboration at the LHC, exploring a seemingly universal feature of transverse momentum spectra of charged particles. We have identified a specific range where the contribution of the hard part is nonexistent for the studied multiplicities. We present the dependence of the mean transverse momenta obtained in the soft and soft+hard (mixed) parts and discuss the results in the context of the ongoing controversy regarding the existence of collectivity in small systems. Finally, we also discuss possible refinements of the analyses concerning the use of statistical parameters of higher order, aimed at better distinguishing the agreement of theoretical and Monte Carlo models with the data.
|
hep-ph/0207225
|
Valery Lyubovitskij
|
V. E. Lyubovitskij, P. Wang, Th. Gutsche and Amand Faessler (Tuebingen
University)
|
Strange nucleon form factors in the perturbative chiral quark model
|
18 pages, 6 figures
|
Phys.Rev. C66 (2002) 055204
|
10.1103/PhysRevC.66.055204
| null |
hep-ph
| null |
We apply the perturbative chiral quark model at one loop to calculate the
strange form factors of the nucleon. A detailed numerical analysis of the
strange magnetic moments and radii of the nucleon, and also the momentum
dependence of the form factors is presented.
|
[
{
"created": "Thu, 18 Jul 2002 13:21:07 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Lyubovitskij",
"V. E.",
"",
"Tuebingen\n University"
],
[
"Wang",
"P.",
"",
"Tuebingen\n University"
],
[
"Gutsche",
"Th.",
"",
"Tuebingen\n University"
],
[
"Faessler",
"Amand",
"",
"Tuebingen\n University"
]
] |
We apply the perturbative chiral quark model at one loop to calculate the strange form factors of the nucleon. A detailed numerical analysis of the strange magnetic moments and radii of the nucleon, and also the momentum dependence of the form factors is presented.
|
1905.12007
|
Andrew Jackura
|
A. W. Jackura, S. M. Dawid, C. Fern\'andez-Ram\'irez, V. Mathieu, M.
Mikhasenko, A. Pilloni, S. R. Sharpe, and A. P. Szczepaniak
|
On the Equivalence of Three-Particle Scattering Formalisms
|
13 pages, 5 figures
|
Phys. Rev. D 100, 034508 (2019)
|
10.1103/PhysRevD.100.034508
|
JLAB-THY-19-2947
|
hep-ph hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In recent years, different on-shell $\mathbf{3}\to\mathbf{3}$ scattering
formalisms have been proposed to be applied to both lattice QCD and infinite
volume scattering processes. We prove that the formulation in the infinite
volume presented by Hansen and Sharpe in Phys.~Rev.~D92, 114509 (2015) and
subsequently Brice\~no, Hansen, and Sharpe in Phys.~Rev.~D95, 074510 (2017) can
be recovered from the $B$-matrix representation, derived on the basis of
$S$-matrix unitarity, presented by Mai {\em et al.} in Eur.~Phys.~J.~A53, 177
(2017) and Jackura {\em et al.} in Eur.~Phys.~J.~C79, 56 (2019). Therefore,
both formalisms in the infinite volume are equivalent and the physical content
is identical. Additionally, the Faddeev equations are recovered in the
non-relativistic limit of both representations.
|
[
{
"created": "Tue, 28 May 2019 18:14:39 GMT",
"version": "v1"
}
] |
2019-08-20
|
[
[
"Jackura",
"A. W.",
""
],
[
"Dawid",
"S. M.",
""
],
[
"Fernández-Ramírez",
"C.",
""
],
[
"Mathieu",
"V.",
""
],
[
"Mikhasenko",
"M.",
""
],
[
"Pilloni",
"A.",
""
],
[
"Sharpe",
"S. R.",
""
],
[
"Szczepaniak",
"A. P.",
""
]
] |
In recent years, different on-shell $\mathbf{3}\to\mathbf{3}$ scattering formalisms have been proposed to be applied to both lattice QCD and infinite volume scattering processes. We prove that the formulation in the infinite volume presented by Hansen and Sharpe in Phys.~Rev.~D92, 114509 (2015) and subsequently Brice\~no, Hansen, and Sharpe in Phys.~Rev.~D95, 074510 (2017) can be recovered from the $B$-matrix representation, derived on the basis of $S$-matrix unitarity, presented by Mai {\em et al.} in Eur.~Phys.~J.~A53, 177 (2017) and Jackura {\em et al.} in Eur.~Phys.~J.~C79, 56 (2019). Therefore, both formalisms in the infinite volume are equivalent and the physical content is identical. Additionally, the Faddeev equations are recovered in the non-relativistic limit of both representations.
|
hep-ph/0410197
|
Zongguo Si
|
W. Bernreuther, A. Brandenburg, Z. G. Si and P. Uwer
|
Investigation of Top quark spin correlations at hadron collider
|
talk given at the 32nd International Conference on High Energy
Physics (ICHEP'04), Beijing, China, 16-22 Aug. 2004
| null |
10.1142/9789812702227_0237
|
CERN-PH-TH/2004-206
|
hep-ph
| null |
We report on our results about hadronic $t\bar t$ production at NLO QCD
including $t, \bar t$ spin effects, especially on $t\bar t$ spin correlations.
|
[
{
"created": "Wed, 13 Oct 2004 16:47:59 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Bernreuther",
"W.",
""
],
[
"Brandenburg",
"A.",
""
],
[
"Si",
"Z. G.",
""
],
[
"Uwer",
"P.",
""
]
] |
We report on our results about hadronic $t\bar t$ production at NLO QCD including $t, \bar t$ spin effects, especially on $t\bar t$ spin correlations.
|
1709.05955
|
Madhurima Pandey
|
Madhurima Pandey, Debasish Majumdar, Kamakshya Prasad Modak
|
Two Component Feebly Interacting Massive Particle (FIMP) Dark Matter
|
31 pages LaTeX, 20 eps figures
| null |
10.1088/1475-7516/2018/06/023
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We explore the idea of an alternative candidate for particle dark matter
namely Feebly Interacting Massive Particle (FIMP) in the framework of a two
component singlet scalar model. Singlet scalar dark matter has already been
demonstrated to be a viable candidate for WIMP (Weakly Interacting Massive
Particle) dark matter in literature. In the FIMP scenario, dark matter
particles are slowly produced via "thermal frreze-in" mechanism in the early
Universe and are never abundant enough to reach thermal equilibrium or to
undergo pair annihilation inside the Universe's plasma due to their extremely
small couplings. We demonstrate that for smaller couplings too, required for
freeze-in process, a two component scalar dark matter model considered here
could well be a viable candidate for FIMP. In this scenario, the Standard Model
of particle physics is extended by two gauge singlet real scalars whose
stability is protected by an unbroken $Z_{2}\times {Z'}_{2}$ symmetry and they
are assumed to acquire no VEV after Spontaneous Symmetry Breaking. We explore
the viable mass regions in the present two scalar DM model that is in
accordance with the FIMP scenario. We also explore the upper limits of masses
of the two components from the consideration of their self interactions.
|
[
{
"created": "Mon, 18 Sep 2017 14:09:47 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Oct 2017 08:07:57 GMT",
"version": "v2"
}
] |
2018-06-27
|
[
[
"Pandey",
"Madhurima",
""
],
[
"Majumdar",
"Debasish",
""
],
[
"Modak",
"Kamakshya Prasad",
""
]
] |
We explore the idea of an alternative candidate for particle dark matter namely Feebly Interacting Massive Particle (FIMP) in the framework of a two component singlet scalar model. Singlet scalar dark matter has already been demonstrated to be a viable candidate for WIMP (Weakly Interacting Massive Particle) dark matter in literature. In the FIMP scenario, dark matter particles are slowly produced via "thermal frreze-in" mechanism in the early Universe and are never abundant enough to reach thermal equilibrium or to undergo pair annihilation inside the Universe's plasma due to their extremely small couplings. We demonstrate that for smaller couplings too, required for freeze-in process, a two component scalar dark matter model considered here could well be a viable candidate for FIMP. In this scenario, the Standard Model of particle physics is extended by two gauge singlet real scalars whose stability is protected by an unbroken $Z_{2}\times {Z'}_{2}$ symmetry and they are assumed to acquire no VEV after Spontaneous Symmetry Breaking. We explore the viable mass regions in the present two scalar DM model that is in accordance with the FIMP scenario. We also explore the upper limits of masses of the two components from the consideration of their self interactions.
|
hep-ph/0104250
|
Kingman Cheung
|
Kingman Cheung (NCTS)
|
Sensitivity Study of Extra Dimensions at TeV $e^+ e^-$ colliders
|
6 pages. A contribution to the theory meeting on physics at linear
colliders, 15--17 March 2001, KEK, Japan
| null | null |
NSC-NCTS-010425
|
hep-ph
| null |
We study the sensitivity reach of $0.5-2$ TeV $e^+ e^-$ linear colliders in
the context of the ADD model, in which gravity becomes strong at TeV scale. We
include the real emission channel $e^+ e^- \to \gamma G$, as well as the
virtual-graviton-exchange channels $e^+ e^- \to \gamma \gamma, q\bar q,
\mu^+\mu^-, \tau^+ \tau^-, e^+ e^-$. Assuming no excess of events over the
standard model predictions, we obtain the lower 95% C.L. limits on the
effective Planck scale. These limits are better than those obtained in the Run
II's of the Tevatron and comparable to those of the LHC.
|
[
{
"created": "Tue, 24 Apr 2001 17:31:00 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Cheung",
"Kingman",
"",
"NCTS"
]
] |
We study the sensitivity reach of $0.5-2$ TeV $e^+ e^-$ linear colliders in the context of the ADD model, in which gravity becomes strong at TeV scale. We include the real emission channel $e^+ e^- \to \gamma G$, as well as the virtual-graviton-exchange channels $e^+ e^- \to \gamma \gamma, q\bar q, \mu^+\mu^-, \tau^+ \tau^-, e^+ e^-$. Assuming no excess of events over the standard model predictions, we obtain the lower 95% C.L. limits on the effective Planck scale. These limits are better than those obtained in the Run II's of the Tevatron and comparable to those of the LHC.
|
hep-ph/0011376
|
Michael Dine
|
Michael Dine
|
TASI Lectures on The Strong CP Problem
|
Latex, 24 pages
| null | null |
SCIPP-00/30
|
hep-ph
| null |
These lectures discuss the $\theta$ parameter of QCD. After an introduction
to anomalies in four and two dimensions, the parameter is introduced. That such
topological parameters can have physical effects is illustrated with two
dimensional models, and then explained in QCD using instantons and current
algebra. Possible solutions including axions, a massless up quark, and
spontaneous CP violation are discussed.
|
[
{
"created": "Wed, 29 Nov 2000 19:10:09 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Nov 2000 22:10:33 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Dine",
"Michael",
""
]
] |
These lectures discuss the $\theta$ parameter of QCD. After an introduction to anomalies in four and two dimensions, the parameter is introduced. That such topological parameters can have physical effects is illustrated with two dimensional models, and then explained in QCD using instantons and current algebra. Possible solutions including axions, a massless up quark, and spontaneous CP violation are discussed.
|
2308.03453
|
Pietro Colangelo
|
Pietro Colangelo, Fulvia De Fazio, Francesco Loparco, Nicola Losacco
|
Dalitz decays $D_{sJ}^{(*)} \to D_s^{(*)} \ell^+ \ell^- $
|
LaTeX, 23 pages, 6 figures. Version to appear on PRD
| null | null |
BARI-TH/23-749
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
The Dalitz decays of the positive parity $D_{sJ}^{(*)}$ charmed mesons,
$D_{sJ}^{(*)} \to D_s^{(*)} \ell^+ \ell^-$ with $J=0,1,2$ and $\ell=e, \mu$,
are important processes to investigate the nature of the $D_{sJ}^{(*)}$ states.
We analyze the full set of decays, considering the four lightest $D_{sJ}^{(*)}$
mesons as belonging to the heavy quark spin doublets $\displaystyle
s_\ell^P=\frac{1}{2}^+$ and $\displaystyle \frac{3}{2}^+$, with $s_\ell^P$ the
spin-parity of the light degrees of freedom in mesons. The description implies
relations among the observables in various modes. We study the decay
distributions in the dilepton invariant mass squared and the distributions in
the angle between the charged lepton momentum and the momentum of the produced
meson, which are expressed in terms of universal form factors and of effective
strong couplings. Such measurements are feasible at the present facilities.
|
[
{
"created": "Mon, 7 Aug 2023 10:17:18 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Oct 2023 18:31:55 GMT",
"version": "v2"
}
] |
2023-10-24
|
[
[
"Colangelo",
"Pietro",
""
],
[
"De Fazio",
"Fulvia",
""
],
[
"Loparco",
"Francesco",
""
],
[
"Losacco",
"Nicola",
""
]
] |
The Dalitz decays of the positive parity $D_{sJ}^{(*)}$ charmed mesons, $D_{sJ}^{(*)} \to D_s^{(*)} \ell^+ \ell^-$ with $J=0,1,2$ and $\ell=e, \mu$, are important processes to investigate the nature of the $D_{sJ}^{(*)}$ states. We analyze the full set of decays, considering the four lightest $D_{sJ}^{(*)}$ mesons as belonging to the heavy quark spin doublets $\displaystyle s_\ell^P=\frac{1}{2}^+$ and $\displaystyle \frac{3}{2}^+$, with $s_\ell^P$ the spin-parity of the light degrees of freedom in mesons. The description implies relations among the observables in various modes. We study the decay distributions in the dilepton invariant mass squared and the distributions in the angle between the charged lepton momentum and the momentum of the produced meson, which are expressed in terms of universal form factors and of effective strong couplings. Such measurements are feasible at the present facilities.
|
1608.07271
|
Florian Lyonnet
|
Florian Lyonnet
|
On the impact of kinetic mixing in beta functions at two-loop
|
7 pages, 9 figures
|
Phys. Rev. D 94, 076008 (2016)
|
10.1103/PhysRevD.94.076008
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Kinetic mixing is a fundamental property of models with a gauge symmetry
involving several $\mathrm{U}(1)$ group factors. In this paper, we perform a
numerical study of the impact of kinetic mixing on beta functions at two-loop.
To do so, we use the recently published PyR@TE 2 software to derive the
complete set of RGEs of the SM B-L model at two-loop including kinetic mixing.
We show that it is important to properly account for kinetic mixing as the
evolution of the parameters with the energy scale can change drastically. In
some cases, these modifications can even lead to a different conclusion
regarding the stability of the scalar potential.
|
[
{
"created": "Thu, 25 Aug 2016 19:49:12 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Sep 2016 13:27:31 GMT",
"version": "v2"
}
] |
2016-11-09
|
[
[
"Lyonnet",
"Florian",
""
]
] |
Kinetic mixing is a fundamental property of models with a gauge symmetry involving several $\mathrm{U}(1)$ group factors. In this paper, we perform a numerical study of the impact of kinetic mixing on beta functions at two-loop. To do so, we use the recently published PyR@TE 2 software to derive the complete set of RGEs of the SM B-L model at two-loop including kinetic mixing. We show that it is important to properly account for kinetic mixing as the evolution of the parameters with the energy scale can change drastically. In some cases, these modifications can even lead to a different conclusion regarding the stability of the scalar potential.
|
1912.09486
|
Aaron C. Vincent
|
Carlos A. Arg\"uelles, Alejandro Diaz, Ali Kheirandish, Andr\'es
Olivares-Del-Campo, Ibrahim Safa, Aaron C. Vincent
|
Dark Matter Annihilation to Neutrinos
|
30 pages, 8 figures. Accepted for publication in Reviews of Modern
Physics
|
Rev. Mod. Phys. 93, 35007 (2021)
|
10.1103/RevModPhys.93.035007
| null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review the annihilation of dark matter into neutrinos over a range of dark
matter masses from MeV$/c^2$ to ZeV$/c^2$. Thermally-produced models of dark
matter are expected to self-annihilate to standard model products. As no such
signal has yet been detected, we turn to neutrino detectors to constrain the
``most invisible channel.'' We review the experimental techniques that are used
to detect neutrinos, and revisit the expected contributions to the neutrino
flux at current and upcoming neutrino experiments. We place updated constraints
on the dark matter self-annhilation cross section to neutrinos $\langle \sigma
v \rangle$ using the most recently available data, and forecast the sensitivity
of upcoming experiments such as Hyper-Kamiokande, DUNE, and IceCube Gen-2.
Where possible, limits and projections are scaled to a single set of dark
matter halo parameters for consistent comparison. We consider Galactic and
extragalactic signals of $s$, $p$, and $d$-wave annihilation processes directly
into neutrino pairs, yielding constraints that range from $\langle \sigma v
\rangle \sim 2.5\times10^{-26}~{\rm cm}^3 {\rm s}^{-1}$ at 30 MeV$/c^2$ to
$10^{-17}~{\rm cm}^3{\rm s}^{-1}$ at 10$^{11}$ GeV$/c^2$. Experiments that
report directional and energy information of their events provide much stronger
constraints, outlining the importance of making such data public.
|
[
{
"created": "Thu, 19 Dec 2019 19:00:07 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Nov 2020 15:01:55 GMT",
"version": "v2"
},
{
"created": "Thu, 10 Jun 2021 13:15:47 GMT",
"version": "v3"
}
] |
2021-09-22
|
[
[
"Argüelles",
"Carlos A.",
""
],
[
"Diaz",
"Alejandro",
""
],
[
"Kheirandish",
"Ali",
""
],
[
"Olivares-Del-Campo",
"Andrés",
""
],
[
"Safa",
"Ibrahim",
""
],
[
"Vincent",
"Aaron C.",
""
]
] |
We review the annihilation of dark matter into neutrinos over a range of dark matter masses from MeV$/c^2$ to ZeV$/c^2$. Thermally-produced models of dark matter are expected to self-annihilate to standard model products. As no such signal has yet been detected, we turn to neutrino detectors to constrain the ``most invisible channel.'' We review the experimental techniques that are used to detect neutrinos, and revisit the expected contributions to the neutrino flux at current and upcoming neutrino experiments. We place updated constraints on the dark matter self-annhilation cross section to neutrinos $\langle \sigma v \rangle$ using the most recently available data, and forecast the sensitivity of upcoming experiments such as Hyper-Kamiokande, DUNE, and IceCube Gen-2. Where possible, limits and projections are scaled to a single set of dark matter halo parameters for consistent comparison. We consider Galactic and extragalactic signals of $s$, $p$, and $d$-wave annihilation processes directly into neutrino pairs, yielding constraints that range from $\langle \sigma v \rangle \sim 2.5\times10^{-26}~{\rm cm}^3 {\rm s}^{-1}$ at 30 MeV$/c^2$ to $10^{-17}~{\rm cm}^3{\rm s}^{-1}$ at 10$^{11}$ GeV$/c^2$. Experiments that report directional and energy information of their events provide much stronger constraints, outlining the importance of making such data public.
|
hep-ph/9805300
| null |
Bruce A. Campbell, Mary K. Gaillard, Hitoshi Murayama, and Keith A.
Olive
|
Regulating the Baryon Asymmetry in No-Scale Affleck-Dine Baryogenesis
|
21 pages, latex, 1 ps figures
|
Nucl.Phys.B538:351-367,1999
|
10.1016/S0550-3213(98)00574-4
|
UMN-TH-1704/98, LBL-41768, UCB-PTH-98/23
|
hep-ph astro-ph
| null |
In supergravity models (such as standard superstring constructions) that
possess a Heisenberg symmetry, supersymmetry breaking by the inflationary
vacuum energy does not lift flat directions at tree level. One-loop corrections
give small squared masses that are negative (about -g^2 H^2/(4\pi)^2) for all
flat directions that do not involve the stop. After inflation, these flat
directions generate a large baryon asymmetry; typically $n_B/s \sim$ O(1). We
consider mechanisms for suppressing this asymmetry to the observed level. These
include dilution from inflaton or moduli decay, GUT nonflatness of the $vev$
direction, and higher dimensional operators in both GUT models and the MSSM. We
find that the observed BAU can easily be generated when one or more of these
effects is present.
|
[
{
"created": "Tue, 12 May 1998 18:54:02 GMT",
"version": "v1"
}
] |
2009-09-15
|
[
[
"Campbell",
"Bruce A.",
""
],
[
"Gaillard",
"Mary K.",
""
],
[
"Murayama",
"Hitoshi",
""
],
[
"Olive",
"Keith A.",
""
]
] |
In supergravity models (such as standard superstring constructions) that possess a Heisenberg symmetry, supersymmetry breaking by the inflationary vacuum energy does not lift flat directions at tree level. One-loop corrections give small squared masses that are negative (about -g^2 H^2/(4\pi)^2) for all flat directions that do not involve the stop. After inflation, these flat directions generate a large baryon asymmetry; typically $n_B/s \sim$ O(1). We consider mechanisms for suppressing this asymmetry to the observed level. These include dilution from inflaton or moduli decay, GUT nonflatness of the $vev$ direction, and higher dimensional operators in both GUT models and the MSSM. We find that the observed BAU can easily be generated when one or more of these effects is present.
|
0901.0165
|
Zhenjun Xiao
|
Xin Liu, Zhi-Qing Zhang, Zhen-Jun Xiao
|
$B \to (\jpsi,\eta_c) K$ decays in the perturbative QCD approach
|
18 pages, 3 figures, RevTex. some modifications in content,numerical
results changed
| null |
10.1088/1674-1137/34/7/002
|
NJNU-TH-0901
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we calculated the $B \to (\jpsi, \eta_c) K$ decays in the
perturbative QCD approach with the inclusion of the partial next-to-leading
order (NLO) contributions. We found that (a) when the large enhancements from
the known NLO contributions are taken into account, the NLO pQCD predictions
for the branching ratios are the following: $Br(B^0 \to \jpsi K^0) =
5.2^{+3.5}_{-2.8}\times 10^{-4}$, $Br(B^+ \to \jpsi K^+) =
5.6^{+3.7}_{-2.9}\times 10^{-4}$, $Br(B^0 \to \eta_c K^0) =
5.5^{+2.3}_{-2.0}\times 10^{-4}$, $Br(B^+ \to \eta_c K^+) =
5.9^{+2.5}_{-2.1}\times 10^{-4}$, which are roughly 40% smaller than the
measured values, but basically agree with the data within $2-\sigma$ errors;
(b) the NLO pQCD predictions for the CP-violating asymmetries of $B \to
(\jpsi,\eta_c)K$ decays agree perfectly with the data.
|
[
{
"created": "Thu, 1 Jan 2009 07:10:55 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Jan 2009 00:38:47 GMT",
"version": "v2"
},
{
"created": "Mon, 4 May 2009 00:39:14 GMT",
"version": "v3"
}
] |
2015-05-13
|
[
[
"Liu",
"Xin",
""
],
[
"Zhang",
"Zhi-Qing",
""
],
[
"Xiao",
"Zhen-Jun",
""
]
] |
In this paper, we calculated the $B \to (\jpsi, \eta_c) K$ decays in the perturbative QCD approach with the inclusion of the partial next-to-leading order (NLO) contributions. We found that (a) when the large enhancements from the known NLO contributions are taken into account, the NLO pQCD predictions for the branching ratios are the following: $Br(B^0 \to \jpsi K^0) = 5.2^{+3.5}_{-2.8}\times 10^{-4}$, $Br(B^+ \to \jpsi K^+) = 5.6^{+3.7}_{-2.9}\times 10^{-4}$, $Br(B^0 \to \eta_c K^0) = 5.5^{+2.3}_{-2.0}\times 10^{-4}$, $Br(B^+ \to \eta_c K^+) = 5.9^{+2.5}_{-2.1}\times 10^{-4}$, which are roughly 40% smaller than the measured values, but basically agree with the data within $2-\sigma$ errors; (b) the NLO pQCD predictions for the CP-violating asymmetries of $B \to (\jpsi,\eta_c)K$ decays agree perfectly with the data.
|
hep-ph/9901284
|
Yuji Koike
|
Yuji Koike (Niigata Univ.)
|
Hadron Structures and Perturbative QCD
|
17 pages in Latex. Invited talk presented at ``RCNP International
School of Physics of Hadrons and QCD'', October 12-13, 1998, Osaka, Japan
| null | null | null |
hep-ph
| null |
In the first part of this talk, I will summarize recent developments in the
study of the chiral-odd spin-dependent parton distributions h_1(x,Q^2) and
h_L(x,Q^2) of the nucleon, in particular, (i) Next-to- leading order Q^2
evolution of h_1(x,Q^2) and (ii) Leading order Q^2 evolution of the twist-3
distribution $h_L(x,Q^2)$ and the universal simplification of the Q^2 evolution
of all the twist-3 distributions in the large $N_c$ limit. The second part of
this talk will be devoted to a systematic analysis on the light-cone
distribution amplitudes of vector mesons ($\rho$, $\omega$, $\phi$, $K^*$ etc)
relevant for exclusive processes producing these mesons. In particular, twist-3
distribution amplitudes are discussed in detail.
|
[
{
"created": "Wed, 13 Jan 1999 06:00:24 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Koike",
"Yuji",
"",
"Niigata Univ."
]
] |
In the first part of this talk, I will summarize recent developments in the study of the chiral-odd spin-dependent parton distributions h_1(x,Q^2) and h_L(x,Q^2) of the nucleon, in particular, (i) Next-to- leading order Q^2 evolution of h_1(x,Q^2) and (ii) Leading order Q^2 evolution of the twist-3 distribution $h_L(x,Q^2)$ and the universal simplification of the Q^2 evolution of all the twist-3 distributions in the large $N_c$ limit. The second part of this talk will be devoted to a systematic analysis on the light-cone distribution amplitudes of vector mesons ($\rho$, $\omega$, $\phi$, $K^*$ etc) relevant for exclusive processes producing these mesons. In particular, twist-3 distribution amplitudes are discussed in detail.
|
1302.1295
|
Eugenio Javier Garzon Alama
|
E. J. Garzon, J. J. Xie and E. Oset
|
A case in favor of the $N^*(1700)(3/2^-)$
| null | null |
10.1103/PhysRevC.87.055204
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using an interaction extracted from the local hidden gauge Lagrangians, which
brings together vector and pseudoscalar mesons, and the coupled channels $\rho
N$ (s-wave), $\pi N$ (d-wave), $\pi \Delta$ (s-wave) and $\pi \Delta$ (d-wave),
we look in the region of $\sqrt s =1400-1850$ MeV and we find two resonances
dynamically generated by the interaction of these channels, which are naturally
associated to the $N^*(1520) (3/2^-)$ and $N^*(1700) (3/2^-)$. The $N^*(1700)
(3/2^-)$ appears neatly as a pole in the complex plane. The free parameters of
the theory are chosen to fit the $\pi N$ (d-wave) data. Both the real and
imaginary parts of the $\pi N$ amplitude vanish in our approach in the vicinity
of this resonance, similarly to what happens in experimental determinations,
what makes this signal very weak in this channel. This feature could explain
why this resonance does not show up in some experimental analyses, but the
situation is analogous to that of the $f_0(980)$ resonance, the second scalar
meson after the $\sigma (f_0(500))$ in the $\pi \pi$(d-wave) amplitude. The
unitary coupled channel approach followed here, in connection with the
experimental data, leads automatically to a pole in the 1700 MeV region and
makes this second $3/2^-$ resonance unavoidable.
|
[
{
"created": "Wed, 6 Feb 2013 09:31:06 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Feb 2013 10:31:12 GMT",
"version": "v2"
}
] |
2013-05-22
|
[
[
"Garzon",
"E. J.",
""
],
[
"Xie",
"J. J.",
""
],
[
"Oset",
"E.",
""
]
] |
Using an interaction extracted from the local hidden gauge Lagrangians, which brings together vector and pseudoscalar mesons, and the coupled channels $\rho N$ (s-wave), $\pi N$ (d-wave), $\pi \Delta$ (s-wave) and $\pi \Delta$ (d-wave), we look in the region of $\sqrt s =1400-1850$ MeV and we find two resonances dynamically generated by the interaction of these channels, which are naturally associated to the $N^*(1520) (3/2^-)$ and $N^*(1700) (3/2^-)$. The $N^*(1700) (3/2^-)$ appears neatly as a pole in the complex plane. The free parameters of the theory are chosen to fit the $\pi N$ (d-wave) data. Both the real and imaginary parts of the $\pi N$ amplitude vanish in our approach in the vicinity of this resonance, similarly to what happens in experimental determinations, what makes this signal very weak in this channel. This feature could explain why this resonance does not show up in some experimental analyses, but the situation is analogous to that of the $f_0(980)$ resonance, the second scalar meson after the $\sigma (f_0(500))$ in the $\pi \pi$(d-wave) amplitude. The unitary coupled channel approach followed here, in connection with the experimental data, leads automatically to a pole in the 1700 MeV region and makes this second $3/2^-$ resonance unavoidable.
|
0711.1899
|
Vladimir Sauli
|
V. Sauli
|
Running Top quark mass in the presence of light SM Higgs
|
Two Sections added, explanation extended, timelike solution added
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The running of the Top quark mass is considered in the nonperturbative
framework of the Schwinger-Dyson equation. Based on the input of physical pole
mass meassured at the Tevatron the method provides the resulting mass function
which is almost constant at low spacelike and timelike scales. The skeleton
loops including Standard Model Higgs and gluons are taken into account. The
dominant two-loop skeleton contribution with triplet Higgs interaction is
considered in addition to one loop dressed approximation of the top quark
self-energy.
|
[
{
"created": "Tue, 13 Nov 2007 01:04:04 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Feb 2008 22:36:21 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Oct 2008 20:25:10 GMT",
"version": "v3"
}
] |
2008-10-14
|
[
[
"Sauli",
"V.",
""
]
] |
The running of the Top quark mass is considered in the nonperturbative framework of the Schwinger-Dyson equation. Based on the input of physical pole mass meassured at the Tevatron the method provides the resulting mass function which is almost constant at low spacelike and timelike scales. The skeleton loops including Standard Model Higgs and gluons are taken into account. The dominant two-loop skeleton contribution with triplet Higgs interaction is considered in addition to one loop dressed approximation of the top quark self-energy.
|
hep-ph/0412355
|
Chungku Kim
|
Chungku Kim
|
Multi-mass-scale RG Improvement of the Coleman-Weinberg Model
| null |
J.Korean Phys.Soc. 46 (2004) 1455
| null | null |
hep-ph
| null |
We obtain the renormalization group improvement of the effective potential
for the Coleman-Weinberg model by resumming the leading logarithms which have
three different mass scales. Then, we investigate the effect of the multi-mass
scale on the prediction of the magnitude of the Higgs boson mass by considering
the two-loop effective potential.
|
[
{
"created": "Thu, 23 Dec 2004 03:19:14 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kim",
"Chungku",
""
]
] |
We obtain the renormalization group improvement of the effective potential for the Coleman-Weinberg model by resumming the leading logarithms which have three different mass scales. Then, we investigate the effect of the multi-mass scale on the prediction of the magnitude of the Higgs boson mass by considering the two-loop effective potential.
|
hep-ph/0412013
|
George Sterman
|
George Sterman
|
QCD and Jets
|
66 pages, 26 eps and ps figures. Based on lectures presented at the
Theoretical Advanced Study Institute (TASI 2004) Boulder, CO, June 2004
| null | null |
YITP-SB-04-59
|
hep-ph
| null |
These lectures introduce some of the basic methods of perturbative QCD and
their applications to phenomenology at high energy. Emphasis is given to
techniques that are used to study QCD and related field theories to all orders
in perturbation theory, with introductions to infrared safety, factorization
and evolution in high energy hard scattering.
|
[
{
"created": "Wed, 1 Dec 2004 18:35:15 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Sterman",
"George",
""
]
] |
These lectures introduce some of the basic methods of perturbative QCD and their applications to phenomenology at high energy. Emphasis is given to techniques that are used to study QCD and related field theories to all orders in perturbation theory, with introductions to infrared safety, factorization and evolution in high energy hard scattering.
|
hep-ph/9706287
| null |
Mayumi Aoki, Akio Sugamoto and Noriyuki Oshimo
|
Implications of baryon asymmetry for the electric dipole moment of the
neutron
|
9 pages, 2 Postscript figures
|
Prog.Theor.Phys. 98 (1997) 1325-1332
|
10.1143/PTP.98.1325
|
ICRR-Report-389-97-12,OCHA-PP-96
|
hep-ph
| null |
We study baryogenesis at the electroweak phase transition of the universe
within the framework of the supersymmetric standard model (SSM) based on N=1
supergravity. This model contains a new source of CP violation in the
mass-squared matrices for squarks, which could enable $t$ squarks to mediate
the charge transport mechanism for generating baryon asymmetry. The same
CP-violating source also induces the electric dipole moment (EDM) of the
neutron at the one-loop level. If the new CP-violating phase is not suppressed,
it is shown, the $t$-squark transport can lead to baryon asymmetry consistent
with its observed value within reasonable ranges of SSM parameters. For these
parameter ranges the magnitude of the neutron EDM is predicted to be not much
smaller than its present experimental upper bound.
|
[
{
"created": "Mon, 9 Jun 1997 09:34:37 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Aoki",
"Mayumi",
""
],
[
"Sugamoto",
"Akio",
""
],
[
"Oshimo",
"Noriyuki",
""
]
] |
We study baryogenesis at the electroweak phase transition of the universe within the framework of the supersymmetric standard model (SSM) based on N=1 supergravity. This model contains a new source of CP violation in the mass-squared matrices for squarks, which could enable $t$ squarks to mediate the charge transport mechanism for generating baryon asymmetry. The same CP-violating source also induces the electric dipole moment (EDM) of the neutron at the one-loop level. If the new CP-violating phase is not suppressed, it is shown, the $t$-squark transport can lead to baryon asymmetry consistent with its observed value within reasonable ranges of SSM parameters. For these parameter ranges the magnitude of the neutron EDM is predicted to be not much smaller than its present experimental upper bound.
|
hep-ph/9906528
|
Detlef Nolte
|
David H. Evans, Benjamin Grinstein and Detlef R. Nolte (UC San Diego)
|
Short Distance Analysis of $\bar B -> D^{(*)0} e+e-$ and $\bar B ->
J/psi e+e-$
|
13 pages, 11 figures, published version
|
Nucl.Phys. B577 (2000) 240-260
|
10.1016/S0550-3213(00)00159-0
|
UCSD/PTH 99-09
|
hep-ph
| null |
Over a large fraction of phase space a combination of an operator product and
heavy quark expansions effectively turn the decay $\bar B -> D^{(*)0} e+e-$
into a ``short distance'' process, i.e., one in which the weak and
electromagnetic interactions occur through single local operators. These
processes have an underlying W-exchange quark diagram topology and are
therefore Cabibbo allowed but suppressed by combinatoric factors and short
distance QCD corrections. Our technique allows a clearer exploration of these
effects. For the decay $\bar B_{d,s} -> J/psi(\eta_c) e+e-$ one must use a
non-relativistic (NRQCD) expansion, in addition to an operator product
expansion and a heavy quark effective theory expansion. We estimate the decay
rates for $\bar B_{d,s} -> J/psi e+e-$, $\bar B_{d,s} -> eta_c e+e-$, $\bar
B_{d,s} -> D^{*0} e+e-$ and $\bar B_{d,s} -> D^{0} e+e-$.
|
[
{
"created": "Tue, 29 Jun 1999 01:24:31 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jun 2000 18:55:49 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Evans",
"David H.",
"",
"UC San Diego"
],
[
"Grinstein",
"Benjamin",
"",
"UC San Diego"
],
[
"Nolte",
"Detlef R.",
"",
"UC San Diego"
]
] |
Over a large fraction of phase space a combination of an operator product and heavy quark expansions effectively turn the decay $\bar B -> D^{(*)0} e+e-$ into a ``short distance'' process, i.e., one in which the weak and electromagnetic interactions occur through single local operators. These processes have an underlying W-exchange quark diagram topology and are therefore Cabibbo allowed but suppressed by combinatoric factors and short distance QCD corrections. Our technique allows a clearer exploration of these effects. For the decay $\bar B_{d,s} -> J/psi(\eta_c) e+e-$ one must use a non-relativistic (NRQCD) expansion, in addition to an operator product expansion and a heavy quark effective theory expansion. We estimate the decay rates for $\bar B_{d,s} -> J/psi e+e-$, $\bar B_{d,s} -> eta_c e+e-$, $\bar B_{d,s} -> D^{*0} e+e-$ and $\bar B_{d,s} -> D^{0} e+e-$.
|
2205.05022
|
Michael Zantedeschi
|
Goran Senjanovi\'c and Michael Zantedeschi
|
$SU(5)$ grand unification and $W$-boson mass
|
7 pages, 3 figures, v3: Published version
| null |
10.1016/j.physletb.2022.137653
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
A realistic extension of the minimal $SU(5)$ theory consisting of the
addition of an adjoint fermion is known to predict light real fermion and
scalar weak triplets, potentially accessible at the LHC. These particles, in
addition to playing a key role in gauge coupling unification, have profound
phenomenological implications. The fermion triplet, that through the seesaw
mechanism offers a testable origin of neutrino mass, has been already
extensively discussed. The scalar triplet develops a vacuum expectation value
that modifies the $W$-boson mass. We show that its low-energy effective theory
is remarkably predictive: in the leading approximation, all the relevant
physical processes involving the scalar triplet depend only on its mass and the
deviation from the Standard Model $W$-mass value.
|
[
{
"created": "Tue, 10 May 2022 16:35:36 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Sep 2022 12:35:03 GMT",
"version": "v2"
},
{
"created": "Tue, 10 Jan 2023 16:17:12 GMT",
"version": "v3"
}
] |
2023-01-11
|
[
[
"Senjanović",
"Goran",
""
],
[
"Zantedeschi",
"Michael",
""
]
] |
A realistic extension of the minimal $SU(5)$ theory consisting of the addition of an adjoint fermion is known to predict light real fermion and scalar weak triplets, potentially accessible at the LHC. These particles, in addition to playing a key role in gauge coupling unification, have profound phenomenological implications. The fermion triplet, that through the seesaw mechanism offers a testable origin of neutrino mass, has been already extensively discussed. The scalar triplet develops a vacuum expectation value that modifies the $W$-boson mass. We show that its low-energy effective theory is remarkably predictive: in the leading approximation, all the relevant physical processes involving the scalar triplet depend only on its mass and the deviation from the Standard Model $W$-mass value.
|
1004.2890
|
Edward Shuryak
|
Cyrus Faroughy and Edward Shuryak
|
The Lifetime of the Electric Flux Tubes near the QCD Phase Transition
| null |
Phys.Rev.C82:014902,2010
|
10.1103/PhysRevC.82.014902
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Electric flux tubes are a well known attribute of the QCD vacuum in which
they manifest confinement of electric color charges. Recently, experimental
results have appeared suggesting that not only those objects persist at
temperatures $T\approx T_c$ near the QCD phase transitions, but their decay is
suppressed and the resulting clusters in AuAu collisions are larger than in pp
(i.e. in vacuum). This correlates well with recent theoretical scenarios that
view the QCD matter in the $T\approx T_{c}$ region as a dual-magnetic plasma
dominated by color-magnetic monopoles. In this view the flux tubes are
stabilized by dual-magnetic currents and are described by
dual-magnetohydrodynamics (DMHD). In this paper we calculate classically the
dissipative effects in the flux tube. Such effects are associated with
rescattering and finite conductivity of the matter. We derive the DMHD solution
in the presence of dissipation and then estimate the lifetime of the electric
flux tubes. The conclusion of this study is that a classical treatment leads to
too short of a lifetime for the flux tubes.
|
[
{
"created": "Fri, 16 Apr 2010 17:36:48 GMT",
"version": "v1"
}
] |
2014-11-20
|
[
[
"Faroughy",
"Cyrus",
""
],
[
"Shuryak",
"Edward",
""
]
] |
Electric flux tubes are a well known attribute of the QCD vacuum in which they manifest confinement of electric color charges. Recently, experimental results have appeared suggesting that not only those objects persist at temperatures $T\approx T_c$ near the QCD phase transitions, but their decay is suppressed and the resulting clusters in AuAu collisions are larger than in pp (i.e. in vacuum). This correlates well with recent theoretical scenarios that view the QCD matter in the $T\approx T_{c}$ region as a dual-magnetic plasma dominated by color-magnetic monopoles. In this view the flux tubes are stabilized by dual-magnetic currents and are described by dual-magnetohydrodynamics (DMHD). In this paper we calculate classically the dissipative effects in the flux tube. Such effects are associated with rescattering and finite conductivity of the matter. We derive the DMHD solution in the presence of dissipation and then estimate the lifetime of the electric flux tubes. The conclusion of this study is that a classical treatment leads to too short of a lifetime for the flux tubes.
|
1910.00567
|
Lauren Street
|
Chris Kouvaris, Eleftherios Papantonopoulos, Lauren Street, and L.C.R.
Wijewardhana
|
Probing Bosonic Stars with Atomic Clocks
|
19 pages, 11 figures; addition to discussion, addition of figures,
and revision of various figures in Sec. 4
|
Phys. Rev. D 102, 063014 (2020)
|
10.1103/PhysRevD.102.063014
|
CERN-TH-2019-145, CP3-Origins-2019-20 DNRF90
|
hep-ph astro-ph.CO gr-qc hep-th physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Dark Matter could potentially manifest itself in the form of asymmetric dark
stars. In this paper we entertain the possibility of probing such asymmetric
bosonic dark matter stars by the use of atomic clocks. If the dark sector
connects to the standard model sector via a Higgs or photon portal, the
interior of boson stars that are in a Bose-Einstein condensate state can change
the values of physical constants that control the timing of atomic clock
devices. Dilute asymmetric dark matter boson stars passing through the Earth
can induce frequency shifts that can be observed in separated Earth based
atomic clocks. This gives the opportunity to probe a class of dark matter
candidates that for the moment cannot be detected with any different
conventional method.
|
[
{
"created": "Tue, 1 Oct 2019 17:43:38 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Apr 2020 19:14:09 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Sep 2020 16:59:29 GMT",
"version": "v3"
}
] |
2020-09-23
|
[
[
"Kouvaris",
"Chris",
""
],
[
"Papantonopoulos",
"Eleftherios",
""
],
[
"Street",
"Lauren",
""
],
[
"Wijewardhana",
"L. C. R.",
""
]
] |
Dark Matter could potentially manifest itself in the form of asymmetric dark stars. In this paper we entertain the possibility of probing such asymmetric bosonic dark matter stars by the use of atomic clocks. If the dark sector connects to the standard model sector via a Higgs or photon portal, the interior of boson stars that are in a Bose-Einstein condensate state can change the values of physical constants that control the timing of atomic clock devices. Dilute asymmetric dark matter boson stars passing through the Earth can induce frequency shifts that can be observed in separated Earth based atomic clocks. This gives the opportunity to probe a class of dark matter candidates that for the moment cannot be detected with any different conventional method.
|
2112.03943
|
Adriano Lana Cherchiglia
|
A. L. Cherchiglia, G. De Conto, and C. C. Nishi
|
Leptonic CP violation from a vector-like lepton
|
Complies with published version
|
JHEP03(2022)010
|
10.1007/JHEP03(2022)010
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Leptonic CP violation is yet to be confirmed as an additional source of CP
violation in fundamental interactions. We study the case where leptonic CP
violation is spontaneous and is induced by the mixing with a heavy charged
vector-like lepton (VLL). We show that the non-decoupling of this VLL is linked
with the presence of CP violation and its coupling with the SM leptons are
partly fixed from the SM Yukawas. Due to the large leptonic mixing angles,
these couplings are typically of the same order and there is no flavor
preference. Strong but not definitive constraints come from charged lepton
flavor violating processes because the VLL can decouple from one or two
leptonic flavors in very special points of parameter space. These special
points are very sensitive to the neutrino Majorana phases.
|
[
{
"created": "Tue, 7 Dec 2021 19:04:04 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Mar 2022 22:10:14 GMT",
"version": "v2"
}
] |
2022-03-04
|
[
[
"Cherchiglia",
"A. L.",
""
],
[
"De Conto",
"G.",
""
],
[
"Nishi",
"C. C.",
""
]
] |
Leptonic CP violation is yet to be confirmed as an additional source of CP violation in fundamental interactions. We study the case where leptonic CP violation is spontaneous and is induced by the mixing with a heavy charged vector-like lepton (VLL). We show that the non-decoupling of this VLL is linked with the presence of CP violation and its coupling with the SM leptons are partly fixed from the SM Yukawas. Due to the large leptonic mixing angles, these couplings are typically of the same order and there is no flavor preference. Strong but not definitive constraints come from charged lepton flavor violating processes because the VLL can decouple from one or two leptonic flavors in very special points of parameter space. These special points are very sensitive to the neutrino Majorana phases.
|
1512.04920
|
Tom Zirke
|
Tom Zirke
|
Numerical Evaluation of Two-Loop Integrals in FDR
|
18 pages, 2 figures, v2: minor corrections, citations added
|
JHEP 02 (2016) 029
|
10.1007/JHEP02(2016)029
|
MPP-2015-301
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a method to numerically evaluate infrared-finite one- and two-loop
integrals within the Four-Dimensional Regularization/Renormalization approach,
in which a small mass serves as regulator. Typical integrals exhibit a
logarithmic dependence on this mass, which we extract with the aid of suitable
subtraction terms that can easily be integrated analytically until the
logarithmic structure is revealed. As first physical applications to test the
method, we calculate QCD corrections to the decay rates of scalar and
pseudoscalar Higgs bosons into two photons in the limit of an infinite
top-quark mass as well as to the $\rho$ parameter.
|
[
{
"created": "Tue, 15 Dec 2015 20:30:23 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Feb 2016 09:23:51 GMT",
"version": "v2"
}
] |
2016-02-08
|
[
[
"Zirke",
"Tom",
""
]
] |
We present a method to numerically evaluate infrared-finite one- and two-loop integrals within the Four-Dimensional Regularization/Renormalization approach, in which a small mass serves as regulator. Typical integrals exhibit a logarithmic dependence on this mass, which we extract with the aid of suitable subtraction terms that can easily be integrated analytically until the logarithmic structure is revealed. As first physical applications to test the method, we calculate QCD corrections to the decay rates of scalar and pseudoscalar Higgs bosons into two photons in the limit of an infinite top-quark mass as well as to the $\rho$ parameter.
|
hep-ph/0110001
|
Mike Berger
|
M. S. Berger and Kim Siyeon
|
Leptogenesis and Low-energy Observables
|
10 pages, revised discussion on light neutrino masses
|
Phys.Rev. D65 (2002) 053019
|
10.1103/PhysRevD.65.053019
|
IUHET-444
|
hep-ph
| null |
We relate leptogenesis in a class of theories to low-energy experimental
observables: quark and lepton masses and mixings. With reasonable assumptions
motivated by grand unification, one can show that the CP-asymmetry parameter
takes a universal form. Furthermore the dilution mass is related to the light
neutrino masses. Overall, these models offer a natural explanation for a lepton
asymmetry in the early universe.
|
[
{
"created": "Fri, 28 Sep 2001 20:01:23 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Jan 2002 19:11:30 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Berger",
"M. S.",
""
],
[
"Siyeon",
"Kim",
""
]
] |
We relate leptogenesis in a class of theories to low-energy experimental observables: quark and lepton masses and mixings. With reasonable assumptions motivated by grand unification, one can show that the CP-asymmetry parameter takes a universal form. Furthermore the dilution mass is related to the light neutrino masses. Overall, these models offer a natural explanation for a lepton asymmetry in the early universe.
|
hep-ph/9310337
| null |
Howard Georgi
|
A Bound on $m_\eta/m_{\eta'}$ for Large $N_C$
|
5 pages, \#HUTP-93/A029
|
Phys.Rev.D49:1666-1667,1994
|
10.1103/PhysRevD.49.1666
| null |
hep-ph
| null |
If the number of colors is large, the ratio $m_\eta/m_{\eta'}$ is bounded
from above. The bound is not satisfied by the observed $\eta$ and $\eta'$
masses.
|
[
{
"created": "Fri, 22 Oct 1993 12:36:46 GMT",
"version": "v1"
}
] |
2009-09-11
|
[
[
"Georgi",
"Howard",
""
]
] |
If the number of colors is large, the ratio $m_\eta/m_{\eta'}$ is bounded from above. The bound is not satisfied by the observed $\eta$ and $\eta'$ masses.
|
2110.12973
|
Zoran Todorovic
|
Z.B. Todorovic
|
Determining the Neutrino Mass Eigenstates and the effective Majorana
Mass
|
38 pages, 4 figures
|
Journal of High Energy Physics, Gravitation and
Cosmology,8,593-622 (2022)
|
10.4236/jhepgc.2022.83042
| null |
hep-ph
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
This paper aims at solving several open questions in current neutrino
physics: the neutrino mass hierarchy, the Dirac CP-violating phase, the
absolute mass of neutrinos, the nature of neutrinos (Dirac or Majorana), the
Majorana matrix, and the absolute value of the effective Majorana neutrino
mass. In the research presented in this paper, we have shown that the precise
definition of the mass splittings between neutrino mass eigenstates, done in
the latest analysis of experimental data, can be of crucial importance for
defining the nature of neutrino mass hierarchy. The Standard Model has three
generations of fundamental matter particles. Three generations of the charged
lepton mass show a hierarchical structure. Owing to that, there is a belief and
it is considered that neutrinos may follow such a hierarchical structure. In
our calculations, we have also included the latest data obtained, based on the
processing of measurement results, which showed that even with such data,
obtained results favor the normal neutrino mass hierarchy. As for the
individual neutrino mass calculated in this paper, in today's neutrino physics
it is only known that the neutrino mass scale is bounded only from above, and
both the Dirac and the Majorana character of neutrinos are compatible with all
observations. Among some of the questions resolved in this paper, which are
related to the properties of neutrinos, a positive answer was also given to the
question of whether light neutrinos are self-conjugate particles or not.
|
[
{
"created": "Mon, 25 Oct 2021 14:06:29 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Apr 2022 09:32:29 GMT",
"version": "v10"
},
{
"created": "Mon, 18 Jul 2022 18:44:41 GMT",
"version": "v11"
},
{
"created": "Thu, 2 Dec 2021 10:20:13 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Feb 2022 10:32:31 GMT",
"version": "v3"
},
{
"created": "Wed, 16 Feb 2022 16:11:48 GMT",
"version": "v4"
},
{
"created": "Thu, 17 Feb 2022 10:19:23 GMT",
"version": "v5"
},
{
"created": "Fri, 18 Feb 2022 11:41:32 GMT",
"version": "v6"
},
{
"created": "Mon, 28 Feb 2022 08:49:46 GMT",
"version": "v7"
},
{
"created": "Wed, 2 Mar 2022 21:22:58 GMT",
"version": "v8"
},
{
"created": "Fri, 4 Mar 2022 11:37:27 GMT",
"version": "v9"
}
] |
2022-07-20
|
[
[
"Todorovic",
"Z. B.",
""
]
] |
This paper aims at solving several open questions in current neutrino physics: the neutrino mass hierarchy, the Dirac CP-violating phase, the absolute mass of neutrinos, the nature of neutrinos (Dirac or Majorana), the Majorana matrix, and the absolute value of the effective Majorana neutrino mass. In the research presented in this paper, we have shown that the precise definition of the mass splittings between neutrino mass eigenstates, done in the latest analysis of experimental data, can be of crucial importance for defining the nature of neutrino mass hierarchy. The Standard Model has three generations of fundamental matter particles. Three generations of the charged lepton mass show a hierarchical structure. Owing to that, there is a belief and it is considered that neutrinos may follow such a hierarchical structure. In our calculations, we have also included the latest data obtained, based on the processing of measurement results, which showed that even with such data, obtained results favor the normal neutrino mass hierarchy. As for the individual neutrino mass calculated in this paper, in today's neutrino physics it is only known that the neutrino mass scale is bounded only from above, and both the Dirac and the Majorana character of neutrinos are compatible with all observations. Among some of the questions resolved in this paper, which are related to the properties of neutrinos, a positive answer was also given to the question of whether light neutrinos are self-conjugate particles or not.
|
1704.02059
|
Yao-Bei Liu
|
Yao-Bei Liu
|
Search for single production of vector-like top partners at the Large
Hadron Electron Collider
|
12 pages, 12 figures, version accepted by Nuclear Physics B
| null |
10.1016/j.nuclphysb.2017.08.006
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The new vector-like top partners with charge $2/3$ are a typical feature of
many new physics models beyond the Standard Model (SM). We propose a search
strategy for single production of top partners $T$ focusing on both the $T\to
Wb$ and $T\to th$ decay channels at the Large Hadron Electron Collider (LHeC).
Our analysis is based on a simplified model in which the top partner is an
$SU(2)$ singlet, with couplings only to the third generation of SM quarks. We
study the observability of the single $T$ through the processes $e^{+}p \to
T(\to bW^{+})\bar{\nu}_{e}\to b\ell^{+}+ \not E_T^{miss}$ and $e^{+}p \to T(\to
th)\bar{\nu}_{e}\to t(\to jj'b)h(\to b\bar{b}) \not E_T^{miss}$ at the LHeC
with the proposed 140 GeV electron beam (with $80\%$ polarization) and 7 TeV
proton beam. For three typical $T$-quark masses (800, 900 and 1000 GeV), the
$3\sigma$ exclusion limits on the $TWb$ coupling are respectively presented for
various values of the integrated luminosity.
|
[
{
"created": "Fri, 7 Apr 2017 00:29:48 GMT",
"version": "v1"
},
{
"created": "Wed, 17 May 2017 09:24:25 GMT",
"version": "v2"
},
{
"created": "Sun, 25 Jun 2017 03:42:28 GMT",
"version": "v3"
},
{
"created": "Tue, 22 Aug 2017 04:05:50 GMT",
"version": "v4"
}
] |
2017-08-23
|
[
[
"Liu",
"Yao-Bei",
""
]
] |
The new vector-like top partners with charge $2/3$ are a typical feature of many new physics models beyond the Standard Model (SM). We propose a search strategy for single production of top partners $T$ focusing on both the $T\to Wb$ and $T\to th$ decay channels at the Large Hadron Electron Collider (LHeC). Our analysis is based on a simplified model in which the top partner is an $SU(2)$ singlet, with couplings only to the third generation of SM quarks. We study the observability of the single $T$ through the processes $e^{+}p \to T(\to bW^{+})\bar{\nu}_{e}\to b\ell^{+}+ \not E_T^{miss}$ and $e^{+}p \to T(\to th)\bar{\nu}_{e}\to t(\to jj'b)h(\to b\bar{b}) \not E_T^{miss}$ at the LHeC with the proposed 140 GeV electron beam (with $80\%$ polarization) and 7 TeV proton beam. For three typical $T$-quark masses (800, 900 and 1000 GeV), the $3\sigma$ exclusion limits on the $TWb$ coupling are respectively presented for various values of the integrated luminosity.
|
1903.01124
|
Yuanfang Yue
|
Junjie Cao, Yangle He, Yusi Pan, Yuanfang Yue, Haijing Zhou, Pengxuan
Zhu
|
Impact of leptonic unitarity and dark matter direct detection
experiments on the NMSSM with inverse seesaw mechanism
|
The version to be published in JHEP
| null |
10.1007/JHEP12(2020)023
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the Next-to-Minimal Supersymmetric Standard Model with the inverse seesaw
mechanism to generate neutrino masses, the lightest sneutrino may act as a
feasible dark matter candidate in vast parameter space. In this case, the
smallness of the leptonic unitarity violation and the recent XENON-1T
experiment can limit the dark matter physics. In particular, they set upper
bounds of the neutrino Yukawa couplings $\lambda_\nu$ and $Y_\nu$. We study
such effects by encoding the constraints in a likelihood function and carrying
out elaborated scans over the parameter space of the theory with the Nested
Sampling algorithm. We show that these constraints are complementary to each
other in limiting the theory, and in some cases, they are very strict. We also
study the impact of the future LZ experiment on the theory.
|
[
{
"created": "Mon, 4 Mar 2019 08:29:26 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Feb 2020 04:14:01 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Oct 2020 10:55:05 GMT",
"version": "v3"
},
{
"created": "Sun, 6 Dec 2020 07:56:49 GMT",
"version": "v4"
}
] |
2020-12-30
|
[
[
"Cao",
"Junjie",
""
],
[
"He",
"Yangle",
""
],
[
"Pan",
"Yusi",
""
],
[
"Yue",
"Yuanfang",
""
],
[
"Zhou",
"Haijing",
""
],
[
"Zhu",
"Pengxuan",
""
]
] |
In the Next-to-Minimal Supersymmetric Standard Model with the inverse seesaw mechanism to generate neutrino masses, the lightest sneutrino may act as a feasible dark matter candidate in vast parameter space. In this case, the smallness of the leptonic unitarity violation and the recent XENON-1T experiment can limit the dark matter physics. In particular, they set upper bounds of the neutrino Yukawa couplings $\lambda_\nu$ and $Y_\nu$. We study such effects by encoding the constraints in a likelihood function and carrying out elaborated scans over the parameter space of the theory with the Nested Sampling algorithm. We show that these constraints are complementary to each other in limiting the theory, and in some cases, they are very strict. We also study the impact of the future LZ experiment on the theory.
|
1901.04643
|
Qing-Hong Cao
|
Qing-Hong Cao, Shao-Long Chen, Yandong Liu, Xiao-Ping Wang
|
What can We Learn from Triple Top-Quark Production?
| null |
Phys. Rev. D 100, 055035 (2019)
|
10.1103/PhysRevD.100.055035
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Different from other multiple top-quark productions, triple top-quark
production requires the presence of both flavor violating neutral interaction
and flavor conserving neutral interaction. We describe the interaction of
triple top-quarks and up-quark in terms of two dimension-6 operators; one can
be induced by a new heavy vector resonance, the other by a scalar resonance.
Combining same-sign top-quark pair production and four top-quark production, we
explore the potential of the 13 TeV LHC on searching for the triple top-quark
production.
|
[
{
"created": "Tue, 15 Jan 2019 03:11:12 GMT",
"version": "v1"
}
] |
2019-10-02
|
[
[
"Cao",
"Qing-Hong",
""
],
[
"Chen",
"Shao-Long",
""
],
[
"Liu",
"Yandong",
""
],
[
"Wang",
"Xiao-Ping",
""
]
] |
Different from other multiple top-quark productions, triple top-quark production requires the presence of both flavor violating neutral interaction and flavor conserving neutral interaction. We describe the interaction of triple top-quarks and up-quark in terms of two dimension-6 operators; one can be induced by a new heavy vector resonance, the other by a scalar resonance. Combining same-sign top-quark pair production and four top-quark production, we explore the potential of the 13 TeV LHC on searching for the triple top-quark production.
|
0710.2550
|
Roman Nevzorov
|
S. Hesselbach, D.J. Miller, G. Moortgat-Pick, R. Nevzorov, M. Trusov
|
The lightest neutralino in the MNSSM
|
Submitted for the SUSY07 proceedings, 4 pages, LaTeX, 3 eps figures,
some minor changes to the text
| null | null |
SHEP-07-39, IPPP-07-67, DCPT-07-134
|
hep-ph
| null |
We examine the allowed mass range of the lightest neutralino within the
Minimal Non--minimal Supersymmetric Standard Model. Being absolutely stable if
R-parity is conserved this lightest neutralino is a candidate for the dark
matter of the universe. We establish the theoretical upper bound on the
lightest neutralino mass and obtain an approximate solution for this mass.
|
[
{
"created": "Fri, 12 Oct 2007 20:58:23 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Dec 2007 19:47:50 GMT",
"version": "v2"
}
] |
2007-12-12
|
[
[
"Hesselbach",
"S.",
""
],
[
"Miller",
"D. J.",
""
],
[
"Moortgat-Pick",
"G.",
""
],
[
"Nevzorov",
"R.",
""
],
[
"Trusov",
"M.",
""
]
] |
We examine the allowed mass range of the lightest neutralino within the Minimal Non--minimal Supersymmetric Standard Model. Being absolutely stable if R-parity is conserved this lightest neutralino is a candidate for the dark matter of the universe. We establish the theoretical upper bound on the lightest neutralino mass and obtain an approximate solution for this mass.
|
1008.4645
|
Harleen Dahiya Dr.
|
Harleen Dahiya and Neetika Sharma
|
Nonperturbative Quark Sea Asymmetries
|
9 pages. Presented at the Gribov-80 Memorial Workshop on Quantum
Chromodynamics and Beyond held at ICTP, Trieste in May 2010. (To appear in
the World Scientific Proceedings)
| null |
10.1142/9789814350198_0020
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The effects of nonperturbatively generated ``quark sea'' have been
investigated to determine the flavor structure of the octet baryons. The chiral
constituent quark model ($\chi$CQM), which is known to provide a satisfactory
explanation of the proton spin and related issues in the nonperturbative
regime, is able to explain the qualitative generation of the requisite amount
of quark sea. The importance of quark sea has been studied at different values
of the Bjorken scaling variable $x$ by including it phenomenologically in the
sea quark distribution functions. The results for the quark sea asymmetries
like $\bar d(x)-\bar u(x)$, $\bar d(x)/\bar u(x)$ and Gottfried integral for
the octet baryons strengthen the significance of quark sea at lower values of
$x$.
|
[
{
"created": "Fri, 27 Aug 2010 05:52:34 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Dahiya",
"Harleen",
""
],
[
"Sharma",
"Neetika",
""
]
] |
The effects of nonperturbatively generated ``quark sea'' have been investigated to determine the flavor structure of the octet baryons. The chiral constituent quark model ($\chi$CQM), which is known to provide a satisfactory explanation of the proton spin and related issues in the nonperturbative regime, is able to explain the qualitative generation of the requisite amount of quark sea. The importance of quark sea has been studied at different values of the Bjorken scaling variable $x$ by including it phenomenologically in the sea quark distribution functions. The results for the quark sea asymmetries like $\bar d(x)-\bar u(x)$, $\bar d(x)/\bar u(x)$ and Gottfried integral for the octet baryons strengthen the significance of quark sea at lower values of $x$.
|
2207.13051
|
Fabian Lange
|
Fabian Lange
|
The gradient flow formulation of the electroweak Hamiltonian
|
11 pages, 1 figure, contribution to the proceedings of Loops and Legs
in Quantum Field Theory (LL2022), Ettal, Germany, v2: minor changes, matches
published version
|
PoS LL2022 (2022) 050
|
10.22323/1.416.0050
|
TTP22-049, P3H-22-077
|
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Flavor observables are usually computed with the help of the electroweak
Hamiltonian which separates the short-distance from the long-distance regime.
The Wilson coefficients are calculated perturbatively, while matrix elements of
the operators require non-perturbative treatment for many processes, e.g.
through lattice simulations. The resulting necessity to compute the
transformation between the different renormalization schemes in the two
calculations constitutes an important source of uncertainties. An elegant
solution to this problem is provided by the gradient-flow formalism, already
widely used in lattice simulations, because its composite operators do not
require renormalization. In this contribution we report on the construction of
the electroweak Hamiltonian in the gradient-flow formalism through NNLO in QCD.
|
[
{
"created": "Tue, 26 Jul 2022 17:18:48 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Feb 2023 11:45:19 GMT",
"version": "v2"
}
] |
2023-02-22
|
[
[
"Lange",
"Fabian",
""
]
] |
Flavor observables are usually computed with the help of the electroweak Hamiltonian which separates the short-distance from the long-distance regime. The Wilson coefficients are calculated perturbatively, while matrix elements of the operators require non-perturbative treatment for many processes, e.g. through lattice simulations. The resulting necessity to compute the transformation between the different renormalization schemes in the two calculations constitutes an important source of uncertainties. An elegant solution to this problem is provided by the gradient-flow formalism, already widely used in lattice simulations, because its composite operators do not require renormalization. In this contribution we report on the construction of the electroweak Hamiltonian in the gradient-flow formalism through NNLO in QCD.
|
2301.12573
|
Nicholas Kamp
|
Nicholas W. Kamp, Matheus Hostert, Carlos A. Arg\"uelles, Janet M.
Conrad, Michael H. Shaevitz
|
Implications of MicroBooNE's low sensitivity to electron antineutrino
interactions in the search for the MiniBooNE excess
|
12+4 pages, 7+4 figures
| null |
10.1103/PhysRevD.107.092002
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
The MicroBooNE experiment searched for an excess of electron-neutrinos in the
Booster Neutrino Beam (BNB), providing direct constraints on
$\nu_e$-interpretations of the MiniBooNE low-energy excess (LEE). In this
article, we show that if the MiniBooNE LEE is caused instead by an excess of
$\overline{\nu}_e$, then liquid argon detectors, such as MicroBooNE, SBND and
ICARUS, would have poor sensitivity to it. This is due to a strong suppression
of $\overline{\nu}_e -{}^{40}$Ar cross sections in the low-energy region of the
excess. The MicroBooNE results are consistent at the $2\sigma$~C.L with a
scenario in which the MiniBooNE excess is sourced entirely by
$\overline{\nu}_e$ interactions. The opportune location of ANNIE, a Gd-loaded
water Cherenkov detector, allows for a direct search for a $\overline{\nu}_e$
flux excess in the BNB using inverse-beta-decay events.
|
[
{
"created": "Sun, 29 Jan 2023 22:43:28 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Apr 2023 19:28:29 GMT",
"version": "v2"
}
] |
2023-05-17
|
[
[
"Kamp",
"Nicholas W.",
""
],
[
"Hostert",
"Matheus",
""
],
[
"Argüelles",
"Carlos A.",
""
],
[
"Conrad",
"Janet M.",
""
],
[
"Shaevitz",
"Michael H.",
""
]
] |
The MicroBooNE experiment searched for an excess of electron-neutrinos in the Booster Neutrino Beam (BNB), providing direct constraints on $\nu_e$-interpretations of the MiniBooNE low-energy excess (LEE). In this article, we show that if the MiniBooNE LEE is caused instead by an excess of $\overline{\nu}_e$, then liquid argon detectors, such as MicroBooNE, SBND and ICARUS, would have poor sensitivity to it. This is due to a strong suppression of $\overline{\nu}_e -{}^{40}$Ar cross sections in the low-energy region of the excess. The MicroBooNE results are consistent at the $2\sigma$~C.L with a scenario in which the MiniBooNE excess is sourced entirely by $\overline{\nu}_e$ interactions. The opportune location of ANNIE, a Gd-loaded water Cherenkov detector, allows for a direct search for a $\overline{\nu}_e$ flux excess in the BNB using inverse-beta-decay events.
|
1205.1446
|
Konstantin Goulianos
|
R. Ciesielski, K. Goulianos
|
MBR Monte Carlo Simulation in PYTHIA8
|
10 pages, 5 figures; typo corrected on page 3 in units of s_0 and
short explanation added
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the MBR (Minimum Bias Rockefeller) Monte Carlo simulation of
(anti)proton-proton interactions and its implementation in the PYTHIA8 event
generator. We discuss the total, elastic, and total-inelastic cross sections,
and three contributions from diffraction dissociation processes that contribute
to the latter: single diffraction, double diffraction, and central diffraction
or double-Pomeron exchange. The event generation follows a
renormalized-Regge-theory model, successfully tested using CDF data. Based on
the MBR-enhanced PYTHIA8 simulation, we present cross-section predictions for
the LHC and beyond, up to collision energies of 50 TeV.
|
[
{
"created": "Mon, 7 May 2012 16:13:48 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Aug 2012 16:44:00 GMT",
"version": "v2"
}
] |
2012-08-07
|
[
[
"Ciesielski",
"R.",
""
],
[
"Goulianos",
"K.",
""
]
] |
We present the MBR (Minimum Bias Rockefeller) Monte Carlo simulation of (anti)proton-proton interactions and its implementation in the PYTHIA8 event generator. We discuss the total, elastic, and total-inelastic cross sections, and three contributions from diffraction dissociation processes that contribute to the latter: single diffraction, double diffraction, and central diffraction or double-Pomeron exchange. The event generation follows a renormalized-Regge-theory model, successfully tested using CDF data. Based on the MBR-enhanced PYTHIA8 simulation, we present cross-section predictions for the LHC and beyond, up to collision energies of 50 TeV.
|
2009.04443
|
James Dent
|
James B. Dent, Thomas W. Kephart, Heinrich P\"as, Thomas J. Weiler
|
Flipped Quartification and a composite $b$-quark
|
11 pages
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An alternative "flipped" version of the quartification model is obtained by
rearrangement of the particle assignments. The model has two standard
(trinification) families and one flipped quartification family. An interesting
phenomenological implication is that the model allows for a composite
$b$-quark.
|
[
{
"created": "Wed, 9 Sep 2020 17:45:35 GMT",
"version": "v1"
}
] |
2020-09-10
|
[
[
"Dent",
"James B.",
""
],
[
"Kephart",
"Thomas W.",
""
],
[
"Päs",
"Heinrich",
""
],
[
"Weiler",
"Thomas J.",
""
]
] |
An alternative "flipped" version of the quartification model is obtained by rearrangement of the particle assignments. The model has two standard (trinification) families and one flipped quartification family. An interesting phenomenological implication is that the model allows for a composite $b$-quark.
|
hep-ph/0602124
|
Makiko Nagashima
|
Wei-Shu Hou and Makiko Nagashima
|
Impact of Right-handed Strange-beauty Squark on b <-> s Transitions
|
11 pages, 5 figures, Minor corrections and slight reshuffling of
content
| null | null | null |
hep-ph
| null |
As the hint for CP violating new physics in B-> phi Ks has weakened, we
reconsider the possibility of near maximal mixing between \tilde s_R-\tilde b_R
squarks. Such a right-handed strange-beauty squark \widetilde{sb}_{1} can be
realized by combining supersymmetry with an approximate Abelian flavor
symmetry, and comes with a unique new CP violating phase from right-handed
quark mixing. Naturally heavy strange-beauty squark and gluino, of order 0.5 to
1 TeV, are easily accommodated by recent time-dependent CP violation
measurements in Bd -> phi K^0 and pi^0 K^0. Because of near maximal mixing,
even with such heavy masses, the \widetilde{sb}_{1} and \tilde g can still
strongly impact on Bs mass difference and generate CP violation in the mixing,
which can still be probed at Tevatron Run II. But if the scenario is realized,
the LHC will provide definitive information on the new CP phase, and possibly
discover the \widetilde{sb}_{1} squark. Time-dependent CP violation in Bd ->
K^{*0} gamma can be probed at the future B factory upgrades. Other b -> s
decays influenced by large right-handed dynamics are also discussed.
|
[
{
"created": "Tue, 14 Feb 2006 19:19:40 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Feb 2006 10:26:17 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Hou",
"Wei-Shu",
""
],
[
"Nagashima",
"Makiko",
""
]
] |
As the hint for CP violating new physics in B-> phi Ks has weakened, we reconsider the possibility of near maximal mixing between \tilde s_R-\tilde b_R squarks. Such a right-handed strange-beauty squark \widetilde{sb}_{1} can be realized by combining supersymmetry with an approximate Abelian flavor symmetry, and comes with a unique new CP violating phase from right-handed quark mixing. Naturally heavy strange-beauty squark and gluino, of order 0.5 to 1 TeV, are easily accommodated by recent time-dependent CP violation measurements in Bd -> phi K^0 and pi^0 K^0. Because of near maximal mixing, even with such heavy masses, the \widetilde{sb}_{1} and \tilde g can still strongly impact on Bs mass difference and generate CP violation in the mixing, which can still be probed at Tevatron Run II. But if the scenario is realized, the LHC will provide definitive information on the new CP phase, and possibly discover the \widetilde{sb}_{1} squark. Time-dependent CP violation in Bd -> K^{*0} gamma can be probed at the future B factory upgrades. Other b -> s decays influenced by large right-handed dynamics are also discussed.
|
2210.02591
|
Jesse Thaler
|
Fabio Maltoni, Shufang Su, Jesse Thaler
|
TF07 Snowmass Report: Theory of Collider Phenomena
|
11+11 pages, 343 contributors, 1 key formula; contribution to
Snowmass 2021, draft report of the Theory Frontier topical group for Collider
Phenomenology (TF07), comments and suggestions welcome; v2: updated
contributor list
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Theoretical research has long played an essential role in interpreting data
from high-energy particle colliders and motivating new accelerators to advance
the energy and precision frontiers. Collider phenomenology is an essential
interface between theoretical models and experimental observations, since
theoretical studies inspire experimental analyses while experimental results
sharpen theoretical ideas. This report -- from the Snowmass 2021 Theory
Frontier topical group for Collider Phenomenology (TF07) -- showcases the
dynamism, engagement, and motivations of collider phenomenologists by exposing
selected exciting new directions and establishing key connections between
cutting-edge theoretical advances and current and future experimental
opportunities. By investing in collider phenomenology, the high-energy physics
community can help ensure that theoretical advances are translated into
concrete tools that enable and enhance current and future experiments, and in
turn, experimental results feed into a more complete theoretical understanding
and motivate new questions and explorations.
|
[
{
"created": "Wed, 5 Oct 2022 22:40:14 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Oct 2022 15:17:26 GMT",
"version": "v2"
}
] |
2022-10-20
|
[
[
"Maltoni",
"Fabio",
""
],
[
"Su",
"Shufang",
""
],
[
"Thaler",
"Jesse",
""
]
] |
Theoretical research has long played an essential role in interpreting data from high-energy particle colliders and motivating new accelerators to advance the energy and precision frontiers. Collider phenomenology is an essential interface between theoretical models and experimental observations, since theoretical studies inspire experimental analyses while experimental results sharpen theoretical ideas. This report -- from the Snowmass 2021 Theory Frontier topical group for Collider Phenomenology (TF07) -- showcases the dynamism, engagement, and motivations of collider phenomenologists by exposing selected exciting new directions and establishing key connections between cutting-edge theoretical advances and current and future experimental opportunities. By investing in collider phenomenology, the high-energy physics community can help ensure that theoretical advances are translated into concrete tools that enable and enhance current and future experiments, and in turn, experimental results feed into a more complete theoretical understanding and motivate new questions and explorations.
|
1711.09772
|
Lobsang Dhargyal
|
Lobsang Dhargyal
|
A simple model to explain the observed muon sector anomalies and small
neutrino masses
|
similar to the one accepted at Journal of Physics G: Nuclear and
Particle Physics
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Since its inception, no decisive departure from the predictions of Standard
Model (SM) has been reported. But recently various experiments have observed
few hints of possible departure from SM predictions in lepton flavor
universality observables such as $R_{K^{(*)}}$, $P_{5}^{'}$, muon (g-2),
$R(D^{(*)})$ etc. Many of these observable where deviation from SM in the range
of (2-4)$\sigma$ were observed are related to muon ($\mu$) lepton. So these
deviations may be some hint of a possible New Physics (NP) in the muon sector.
In this work we extend the SM by introducing two SM singlet heavy charged
leptons ($F_{e},\ F_{\mu}$) whose left handed components are charged under a
new $U(1)_{F}$ gauge symmetry, one color triplet lepto-quark ($\phi_{Q}$)
doublet under $SU(2)_{L}$, one inert Higgs doublet ($\phi_{l}$), three very
heavy Majorana neutrinos ($N_{iR}$), all of which are odd under a $Z_{2}$
discrete symmetry. One more scalar ($\phi$) charged only under the $U(1)_{F}$
whose VEV give masses to the $U(1)_{F}$ gauge boson as well as the heavy
leptons. With these new particles, we show that the observed anomalies in the
muon sector as well as small neutrino masses can be explained with taking into
account all the other experimental and theoretical constrains till date.
|
[
{
"created": "Mon, 27 Nov 2017 15:41:58 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Nov 2017 14:32:32 GMT",
"version": "v2"
},
{
"created": "Sun, 28 Jan 2018 13:09:33 GMT",
"version": "v3"
},
{
"created": "Thu, 1 Nov 2018 15:29:26 GMT",
"version": "v4"
},
{
"created": "Thu, 5 Sep 2019 14:44:44 GMT",
"version": "v5"
}
] |
2019-09-06
|
[
[
"Dhargyal",
"Lobsang",
""
]
] |
Since its inception, no decisive departure from the predictions of Standard Model (SM) has been reported. But recently various experiments have observed few hints of possible departure from SM predictions in lepton flavor universality observables such as $R_{K^{(*)}}$, $P_{5}^{'}$, muon (g-2), $R(D^{(*)})$ etc. Many of these observable where deviation from SM in the range of (2-4)$\sigma$ were observed are related to muon ($\mu$) lepton. So these deviations may be some hint of a possible New Physics (NP) in the muon sector. In this work we extend the SM by introducing two SM singlet heavy charged leptons ($F_{e},\ F_{\mu}$) whose left handed components are charged under a new $U(1)_{F}$ gauge symmetry, one color triplet lepto-quark ($\phi_{Q}$) doublet under $SU(2)_{L}$, one inert Higgs doublet ($\phi_{l}$), three very heavy Majorana neutrinos ($N_{iR}$), all of which are odd under a $Z_{2}$ discrete symmetry. One more scalar ($\phi$) charged only under the $U(1)_{F}$ whose VEV give masses to the $U(1)_{F}$ gauge boson as well as the heavy leptons. With these new particles, we show that the observed anomalies in the muon sector as well as small neutrino masses can be explained with taking into account all the other experimental and theoretical constrains till date.
|
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