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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0301251
|
Yeinzon Rodriguez Garcia
|
Yeinzon Rodriguez (1 and 2) and Carlos Quimbay (3) ((1) Department of
Physics Lancaster University, (2) Centro de Investigaciones Universidad
Antonio Narino, (3) Departamento de Fisica Universidad Nacional de Colombia)
|
Are the New Physics Contributions from the Left-Right Symmetric Model
Important for the Indirect CP Violation in the Neutral B Mesons?
|
LaTex file. 19 pages, 4 figures. Change in the way the paper address
the problem. As a result, change in title, abstract, and some sections.
Conclusions unchanged. Version to appear in Foundations of Physics Letters
|
Found.Phys.Lett.18:581-602,2005
|
10.1007/s10702-005-1314-1
| null |
hep-ph
| null |
Several works analyzing the new physics contributions from the Left-Right
Symmetric Model to the CP violation phenomena in the neutral B mesons can be
found in the literature. These works exhibit interesting and experimentally
sensible deviations from the Standard Model predictions but at the expense of
considering a low right scale \upsilon_R around 1 TeV. However, when we stick
to the more conservative estimates for \upsilon_R which say that it must be at
least 10^7 GeV, no experimentally sensible deviations from the Standard Model
appear for indirect CP violation. This estimate for \upsilon_R arises when the
generation of neutrino masses is considered. In spite of the fact that this
scenario is much less interesting and says nothing new about both the CP
violation phenomenon and the structure of the Left-Right Symmetric Model, this
possibility must be taken into account for the sake of completeness and when
considering the see-saw mechanism that provides masses to the neutrino sector.
|
[
{
"created": "Wed, 29 Jan 2003 19:43:32 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Jun 2003 19:17:56 GMT",
"version": "v2"
},
{
"created": "Wed, 8 Jun 2005 18:34:35 GMT",
"version": "v3"
}
] |
2009-04-09
|
[
[
"Rodriguez",
"Yeinzon",
"",
"1 and 2"
],
[
"Quimbay",
"Carlos",
""
]
] |
Several works analyzing the new physics contributions from the Left-Right Symmetric Model to the CP violation phenomena in the neutral B mesons can be found in the literature. These works exhibit interesting and experimentally sensible deviations from the Standard Model predictions but at the expense of considering a low right scale \upsilon_R around 1 TeV. However, when we stick to the more conservative estimates for \upsilon_R which say that it must be at least 10^7 GeV, no experimentally sensible deviations from the Standard Model appear for indirect CP violation. This estimate for \upsilon_R arises when the generation of neutrino masses is considered. In spite of the fact that this scenario is much less interesting and says nothing new about both the CP violation phenomenon and the structure of the Left-Right Symmetric Model, this possibility must be taken into account for the sake of completeness and when considering the see-saw mechanism that provides masses to the neutrino sector.
|
1507.07124
|
Jialun Ping
|
Hongxia Huang, Jialun Ping, Fan Wang
|
Further study of the $N\Omega$ dibaryon within constituent quark models
|
7 pages, 2 figures
|
Phys. Rev. C 92, 065202 (2015)
|
10.1103/PhysRevC.92.065202
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Inspired by the discovery of the dibaryon $d^{*}$ and the experimental search
of $N\Omega$ dibaryon with the STAR data, we study the strange dibaryon
$N\Omega$ further in the framework of quark delocalization color screening
model and chiral quark model. We have shown $N\Omega$ is a narrow resonance in
$\Lambda\Xi$ D-wave scattering before. However, the $\Lambda$-$\Xi$ scattering
data analysis is quite complicated. Here we calculate the low-energy $N\Omega$
scattering phase shifts, scattering length, effective range and binding energy
to provide another approach of STAR data analysis. Our results show there
exists an $N\Omega$ "bound" state, which can be observed by the $N$-$\Omega$
correlation analysis with RHIC and LHC data, or by the new developed automatic
scanning system at J-PARC. Besides, we also find that the hidden color
channel-coupling is important for the $N\Omega$ system to develop
intermediate-range attraction.
|
[
{
"created": "Sat, 25 Jul 2015 17:49:18 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Jul 2015 16:40:23 GMT",
"version": "v2"
}
] |
2015-12-09
|
[
[
"Huang",
"Hongxia",
""
],
[
"Ping",
"Jialun",
""
],
[
"Wang",
"Fan",
""
]
] |
Inspired by the discovery of the dibaryon $d^{*}$ and the experimental search of $N\Omega$ dibaryon with the STAR data, we study the strange dibaryon $N\Omega$ further in the framework of quark delocalization color screening model and chiral quark model. We have shown $N\Omega$ is a narrow resonance in $\Lambda\Xi$ D-wave scattering before. However, the $\Lambda$-$\Xi$ scattering data analysis is quite complicated. Here we calculate the low-energy $N\Omega$ scattering phase shifts, scattering length, effective range and binding energy to provide another approach of STAR data analysis. Our results show there exists an $N\Omega$ "bound" state, which can be observed by the $N$-$\Omega$ correlation analysis with RHIC and LHC data, or by the new developed automatic scanning system at J-PARC. Besides, we also find that the hidden color channel-coupling is important for the $N\Omega$ system to develop intermediate-range attraction.
|
1510.04218
|
Annabelle Chuinard
|
Annabelle Chuinard, Christophe Royon, Rafal Staszewski
|
Testing Pomeron flavour symmetry with diffractive W charge asymmetry
|
17 pages, 8 figures, Submitted to JHEP
| null |
10.1007/JHEP04(2016)092
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This study focuses on hard diffractive events produced in proton-proton
collision at LHC exhibiting one intact proton in the final state which can be
tagged by forward detectors. We report prospective results on the W boson
charge asymmetry measured for such events, which allow to constrain the quark
diffractive density functions in the Pomeron.
|
[
{
"created": "Wed, 14 Oct 2015 18:04:31 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Feb 2016 13:32:49 GMT",
"version": "v2"
}
] |
2016-05-04
|
[
[
"Chuinard",
"Annabelle",
""
],
[
"Royon",
"Christophe",
""
],
[
"Staszewski",
"Rafal",
""
]
] |
This study focuses on hard diffractive events produced in proton-proton collision at LHC exhibiting one intact proton in the final state which can be tagged by forward detectors. We report prospective results on the W boson charge asymmetry measured for such events, which allow to constrain the quark diffractive density functions in the Pomeron.
|
hep-ph/0410034
|
Valentin Zakharov
|
V.I. Zakharov
|
Lower-dimension vacuum defects in lattice Yang-Mills theory
|
19 pages Dedicated to Yuri A. Simonov on his 70th birthday
|
Phys.Atom.Nucl. 68 (2005) 573-581; Yad.Fiz. 68 (2005) 603-611
|
10.1134/1.1903087
|
MPP-2004-122
|
hep-ph
| null |
We overview lattice data on d=1,2,3 vacuum defects in four-dimensional
gluodynamics. In all the cases defects have total volume which scales in
physical units (with zero fractal dimension). In case of d=1,2 the defects are
distinguished by ultraviolet divergent non-Abelian action as well. This
sensitivity to the ultraviolet scale allows to derive from the continuum theory
strong constraints on the properties of the defects. The constraints turn to be
satisfied by the lattice data. In the SU(2) case we introduce a classification
scheme of the defects which allows to (at least) visualize the defect
properties in a simple and unified way. Not-yet-checked relation of the defects
to the spontaneous chiral symmetry breaking is suggested by the scheme.
|
[
{
"created": "Sat, 2 Oct 2004 15:18:13 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Zakharov",
"V. I.",
""
]
] |
We overview lattice data on d=1,2,3 vacuum defects in four-dimensional gluodynamics. In all the cases defects have total volume which scales in physical units (with zero fractal dimension). In case of d=1,2 the defects are distinguished by ultraviolet divergent non-Abelian action as well. This sensitivity to the ultraviolet scale allows to derive from the continuum theory strong constraints on the properties of the defects. The constraints turn to be satisfied by the lattice data. In the SU(2) case we introduce a classification scheme of the defects which allows to (at least) visualize the defect properties in a simple and unified way. Not-yet-checked relation of the defects to the spontaneous chiral symmetry breaking is suggested by the scheme.
|
1512.04917
|
Diego Redigolo
|
Mihailo Backovic, Alberto Mariotti, Diego Redigolo
|
Di-photon excess illuminates Dark Matter
|
23 pages, 8 figures. Added 2 figures and more discussions
| null |
10.1007/JHEP03(2016)157
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a simplified model of dark matter with a scalar mediator to
accommodate the di-photon excess recently observed by the ATLAS and CMS
collaborations. Decays of the resonance into dark matter can easily account for
a relatively large width of the scalar resonance, while the magnitude of the
total width combined with the constraint on dark matter relic density lead to
sharp predictions on the parameters of the Dark Sector. Under the assumption of
a rather large width, the model predicts a signal consistent with ~300 GeV dark
matter particle in channels with large missing energy. This prediction is not
yet severely bounded by LHC Run I searches and will be accessible at the LHC
Run II in the jet plus missing energy channel with more luminosity. Our
analysis also considers astrophysical constraints, pointing out that future
direct detection experiments will be sensitive to this scenario.
|
[
{
"created": "Tue, 15 Dec 2015 20:26:16 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Dec 2015 20:05:44 GMT",
"version": "v2"
}
] |
2016-04-20
|
[
[
"Backovic",
"Mihailo",
""
],
[
"Mariotti",
"Alberto",
""
],
[
"Redigolo",
"Diego",
""
]
] |
We propose a simplified model of dark matter with a scalar mediator to accommodate the di-photon excess recently observed by the ATLAS and CMS collaborations. Decays of the resonance into dark matter can easily account for a relatively large width of the scalar resonance, while the magnitude of the total width combined with the constraint on dark matter relic density lead to sharp predictions on the parameters of the Dark Sector. Under the assumption of a rather large width, the model predicts a signal consistent with ~300 GeV dark matter particle in channels with large missing energy. This prediction is not yet severely bounded by LHC Run I searches and will be accessible at the LHC Run II in the jet plus missing energy channel with more luminosity. Our analysis also considers astrophysical constraints, pointing out that future direct detection experiments will be sensitive to this scenario.
|
1803.09351
|
Odd Magne Ogreid
|
Odd Magne Ogreid
|
Invariants and CP violation in the 2HDM
|
14 pages. Talk given at Corfu Summer Institute 2017, School and
Workshops on Elementary Particle Physics and Gravity, September 2017. To
appear in conference proceedings
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
We discuss the importance of basis invariants in the general 2HDM and how
these relates to masses and couplings. We also present a simple, yet powerful
technique to translate parameters of the potential into combinations of masses
and couplings of the theory and apply this to CP odd invariants.
|
[
{
"created": "Sun, 25 Mar 2018 21:42:13 GMT",
"version": "v1"
}
] |
2018-03-28
|
[
[
"Ogreid",
"Odd Magne",
""
]
] |
We discuss the importance of basis invariants in the general 2HDM and how these relates to masses and couplings. We also present a simple, yet powerful technique to translate parameters of the potential into combinations of masses and couplings of the theory and apply this to CP odd invariants.
|
hep-ph/9909402
|
Loiseau Benoit
|
R. Kaminski, L. Lesniak and B. Loiseau
|
Properties of scalar--isoscalar mesons from multichannel interaction
analysis below 1800 MeV
|
Talk given at XVth Particles and Nuclei Int. Conf. (PANIC99),
Uppsala, Sweden, June 10-16, 1999; 4 pages, 3 figures, file espcrc1.sty
included
|
Nucl.Phys. A663 (2000) 625-628
|
10.1016/S0375-9474(99)00692-2
| null |
hep-ph
| null |
Scalar-isoscalar mesons are studied using an unitary model in three channels:
pi-pi, K-anti K and an effective 2pi-2pi.
All the solutions, fitted to the pi-pi and K-anti K data, exhibit a wide
f0(500), a narrow f0(980) and two relatively narrow resonances, lying on
different sheets between 1300 MeV and 1500 MeV.
These latter states are similar to the f0(1370) and f0(1500) seen in
experiments at CERN. Branching ratios are compared with available data. We have
started investigations of some crossing symmetry and chiral constraints imposed
near the pi-pi threshold on the scalar-isoscalar, scalar-isotensor and P-wave
pi-pi amplitudes.
|
[
{
"created": "Thu, 16 Sep 1999 14:21:36 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Kaminski",
"R.",
""
],
[
"Lesniak",
"L.",
""
],
[
"Loiseau",
"B.",
""
]
] |
Scalar-isoscalar mesons are studied using an unitary model in three channels: pi-pi, K-anti K and an effective 2pi-2pi. All the solutions, fitted to the pi-pi and K-anti K data, exhibit a wide f0(500), a narrow f0(980) and two relatively narrow resonances, lying on different sheets between 1300 MeV and 1500 MeV. These latter states are similar to the f0(1370) and f0(1500) seen in experiments at CERN. Branching ratios are compared with available data. We have started investigations of some crossing symmetry and chiral constraints imposed near the pi-pi threshold on the scalar-isoscalar, scalar-isotensor and P-wave pi-pi amplitudes.
|
1206.7039
|
Dieter M\"uller
|
Dae Sung Hwang and Dieter Mueller
|
Integrated and unintegrated PDFs and GPDs from effective two-body
light-cone wave functions
|
6 pages, talk presented at the 6th International Conference on Quarks
and Nuclear Physics, QNP 2012, April 16-20, 2012, Palaiseau, France
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We suggest a classification scheme for parton distribution models, clarify
the geometrical origin of unintegrated parton distribution relations, which
were observed in various models, present new model relations, and provide for a
so-called "spherical" model the analogous constraints for generalized parton
distributions. Our findings suggest that various classes of uPDF and GPD models
can be obtained from effective two-body light-cone wave functions.
|
[
{
"created": "Fri, 29 Jun 2012 14:41:43 GMT",
"version": "v1"
}
] |
2012-07-02
|
[
[
"Hwang",
"Dae Sung",
""
],
[
"Mueller",
"Dieter",
""
]
] |
We suggest a classification scheme for parton distribution models, clarify the geometrical origin of unintegrated parton distribution relations, which were observed in various models, present new model relations, and provide for a so-called "spherical" model the analogous constraints for generalized parton distributions. Our findings suggest that various classes of uPDF and GPD models can be obtained from effective two-body light-cone wave functions.
|
1603.01118
|
Sebastian Mendizabal
|
Sebastian Mendizabal and Juan Cristobal Rojas
|
Backreaction Effects on Nonequilibrium Spectral Function
|
23 pages, 7 figures
| null |
10.1142/S0217751X17501263
| null |
hep-ph gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show how to compute the spectral function for a scalar theory in two
different scenarios: one which disregards back-reaction i.e. the response of
the environment to the external particle, and the other one where back-reaction
is considered. The calculation was performed using the Kadanoff-Baym equation
through the Keldysh formalism. When back-reaction is neglected, the spectral
function is equal to the equilibrium one, which can be represented as a
Breit-Wigner distribution. When back-reaction is introduced we observed a
damping in the spectral function of the thermal bath. Such behavior modifies
the damping rate for particles created within the bath. This certainly implies
phenomenological consequences right after the Big-Bang, when the primordial
bath was created.
|
[
{
"created": "Thu, 3 Mar 2016 15:00:09 GMT",
"version": "v1"
}
] |
2017-08-16
|
[
[
"Mendizabal",
"Sebastian",
""
],
[
"Rojas",
"Juan Cristobal",
""
]
] |
We show how to compute the spectral function for a scalar theory in two different scenarios: one which disregards back-reaction i.e. the response of the environment to the external particle, and the other one where back-reaction is considered. The calculation was performed using the Kadanoff-Baym equation through the Keldysh formalism. When back-reaction is neglected, the spectral function is equal to the equilibrium one, which can be represented as a Breit-Wigner distribution. When back-reaction is introduced we observed a damping in the spectral function of the thermal bath. Such behavior modifies the damping rate for particles created within the bath. This certainly implies phenomenological consequences right after the Big-Bang, when the primordial bath was created.
|
2110.04784
|
Yu-Gang Ma
|
Yi-An Li, Dong-Fang Wang, Song Zhang, Yu-Gang Ma
|
System evolution of forward-backward multiplicity correlations in a
multi-phase transport model
|
7 pages, 6 figures; accepted by Phys. Rev. C
| null |
10.1103/PhysRevC.104.044906
| null |
hep-ph nucl-ex nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
The initial geometry effect on forward-backward multiplicity correlations
$C(N_{f},N_{b})$ is studied in relativistic collisions between light nuclei by
using a multiphase transport model (AMPT). It is found that tetrahedron
$^{16}$O + $^{16}$O gives a more uniform and symmetrical fireball which
produces a more isotropic distribution of final particles after the expansion
and evolution, and leads to a small $C(N_{f},N_{b})$. Forward-backward
multiplicity correlation could be taken as a useful probe to distinguish the
pattern of $\alpha$-clustered $^{16}$O in experiments by comparing the
neighboring colliding nuclear systems like $^{14}$N + $^{14}$N and $^{19}$F +
$^{19}$F.
|
[
{
"created": "Sun, 10 Oct 2021 12:53:48 GMT",
"version": "v1"
}
] |
2021-11-03
|
[
[
"Li",
"Yi-An",
""
],
[
"Wang",
"Dong-Fang",
""
],
[
"Zhang",
"Song",
""
],
[
"Ma",
"Yu-Gang",
""
]
] |
The initial geometry effect on forward-backward multiplicity correlations $C(N_{f},N_{b})$ is studied in relativistic collisions between light nuclei by using a multiphase transport model (AMPT). It is found that tetrahedron $^{16}$O + $^{16}$O gives a more uniform and symmetrical fireball which produces a more isotropic distribution of final particles after the expansion and evolution, and leads to a small $C(N_{f},N_{b})$. Forward-backward multiplicity correlation could be taken as a useful probe to distinguish the pattern of $\alpha$-clustered $^{16}$O in experiments by comparing the neighboring colliding nuclear systems like $^{14}$N + $^{14}$N and $^{19}$F + $^{19}$F.
|
hep-ph/0002076
|
Juan Garcia-Bellido
|
Juan Garcia-Bellido, Silvia Mollerach and Esteban Roulet
|
Fermion production during preheating after hybrid inflation
|
20 pages, 14 figures, uses epsfig and JHEP macros (included)
|
JHEP 0002 (2000) 034
|
10.1088/1126-6708/2000/02/034
|
FT-UAM-00-05, IFT-UAM/CSIC-00-05
|
hep-ph astro-ph
| null |
At the end of inflation, the coherent oscillations of the inflaton field may
resonantly amplify the long wavelength modes of both bosons and fermions
coupled to it. We study the resonant production of both kinds of particles
during preheating in a model of hybrid inflation. The coherent time evolution
of the inflaton and the Higgs fields after inflation induce a very different
production of fermions depending on whether they are coupled to the Higgs or to
the inflaton. For reasonable values of the model parameters, the fermion
production through parametric resonance can be very efficient. We study the
relative growth of the fermion and boson energy densities during preheating in
hybrid models. During the initial stage of preheating, fermion production
dominates the relative energy density, while the exponential growth of bosonic
modes soon takes over.
|
[
{
"created": "Mon, 7 Feb 2000 19:13:50 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Feb 2000 09:57:48 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Garcia-Bellido",
"Juan",
""
],
[
"Mollerach",
"Silvia",
""
],
[
"Roulet",
"Esteban",
""
]
] |
At the end of inflation, the coherent oscillations of the inflaton field may resonantly amplify the long wavelength modes of both bosons and fermions coupled to it. We study the resonant production of both kinds of particles during preheating in a model of hybrid inflation. The coherent time evolution of the inflaton and the Higgs fields after inflation induce a very different production of fermions depending on whether they are coupled to the Higgs or to the inflaton. For reasonable values of the model parameters, the fermion production through parametric resonance can be very efficient. We study the relative growth of the fermion and boson energy densities during preheating in hybrid models. During the initial stage of preheating, fermion production dominates the relative energy density, while the exponential growth of bosonic modes soon takes over.
|
2305.04585
|
Alla Badalian
|
A. M. Badalian
|
The $X(6550), X(6900), X(7280)$ resonances as the $nS, cc\bar c\bar c$
states
|
16 pages
| null | null | null |
hep-ph hep-ex hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
\date{\today}
Within the diquark-antidiquark model the masses of the $0^{++}, cc\bar c\bar
c$ resonances are calculated, using the expansion of the four-quark wave
function in the set of the hyperspherical functions. The interaction is defined
via a universal pair-wise potential, which does not contain fitting parameters.
The resulting masses $M_4(nS)$ are shown to be very sensitive to the value of
$c-$quark mass, chosen in relativistic string Hamiltonian, and $m_c=1.24, 1.30,
1.43$ (in GeV) are considered. The choice of $m_c$, equal to the current mass,
$m_c=1.245$ GeV, yields three $nS~(n_r=0,1,2)$ states in a very good agreement
with the masses of the $X(6550), X(6900), X(7287)$ resonances, if the
gluon-exchange interaction is totally neglected. This fact indicates on a
possible screening of the gluon-exchange interaction inhe $cc\bar c\bar c$
system. For $m_c=1.43$~GeV the ground state mass $M_4(1S)=6557$~MeV is obtained
in agreement with experiment only if $\alpha_{\rm V}\cong 0.39(1)$ is used,
however, in this case the masses of the $2S, 3S$ radial excitations exceed the
masses of $X(6900), X(7280)$ by $\sim 100$~MeV.
|
[
{
"created": "Mon, 8 May 2023 09:50:16 GMT",
"version": "v1"
},
{
"created": "Mon, 15 May 2023 09:44:24 GMT",
"version": "v2"
}
] |
2023-05-19
|
[
[
"Badalian",
"A. M.",
""
]
] |
\date{\today} Within the diquark-antidiquark model the masses of the $0^{++}, cc\bar c\bar c$ resonances are calculated, using the expansion of the four-quark wave function in the set of the hyperspherical functions. The interaction is defined via a universal pair-wise potential, which does not contain fitting parameters. The resulting masses $M_4(nS)$ are shown to be very sensitive to the value of $c-$quark mass, chosen in relativistic string Hamiltonian, and $m_c=1.24, 1.30, 1.43$ (in GeV) are considered. The choice of $m_c$, equal to the current mass, $m_c=1.245$ GeV, yields three $nS~(n_r=0,1,2)$ states in a very good agreement with the masses of the $X(6550), X(6900), X(7287)$ resonances, if the gluon-exchange interaction is totally neglected. This fact indicates on a possible screening of the gluon-exchange interaction inhe $cc\bar c\bar c$ system. For $m_c=1.43$~GeV the ground state mass $M_4(1S)=6557$~MeV is obtained in agreement with experiment only if $\alpha_{\rm V}\cong 0.39(1)$ is used, however, in this case the masses of the $2S, 3S$ radial excitations exceed the masses of $X(6900), X(7280)$ by $\sim 100$~MeV.
|
hep-ph/9406420
|
Herbert Weigel
|
R. Alkofer, H. Reinhardt, J. Schlienz and H. Weigel
|
Topologically non--trivial chiral transformations: The chiral invariant
elimination of the axial vector meson
|
28 pages LaTeX, 4 figures appended as postscript files,
UNITU-THEP-12/1994
|
Z.Phys.A354:181-196,1996
|
10.1007/s002180050031
| null |
hep-ph
| null |
The role of chiral transformations in effective theories modeling Quantum
Chromo Dynamics is reviewed. In the context of the Nambu--Jona--Lasinio model
the hidden gauge and massive Yang--Mills approaches to vector mesons are
demonstrated to be linked by a special chiral transformation which removes the
chiral field from the scalar--pseudoscalar sector. The chirally rotated axial
vector meson field ($\tilde A_\mu$) transforms homogeneously under flavor
rotations and may thus be dropped without violating chiral symmetry. The
fermion determinant for static meson field configurations is computed by
summing the discretized eigenvalues of the Dirac Hamiltonian. It is discussed
how the local chiral transformation loses its unitary character in a finite
model space. This technical issue proves to be crucial for the construction of
the soliton within the Nambu--Jona--Lasinio model when the chirally rotated
axial vector field is neglected. In the background of this soliton the valence
quark is strongly bound, and its eigenenergy turns out to be negative. This
important physical property which is usually generated only by non--vanishing
axial vector is thus carried over by the simplification $\tilde A_\mu=0$.
|
[
{
"created": "Wed, 29 Jun 1994 13:11:49 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Alkofer",
"R.",
""
],
[
"Reinhardt",
"H.",
""
],
[
"Schlienz",
"J.",
""
],
[
"Weigel",
"H.",
""
]
] |
The role of chiral transformations in effective theories modeling Quantum Chromo Dynamics is reviewed. In the context of the Nambu--Jona--Lasinio model the hidden gauge and massive Yang--Mills approaches to vector mesons are demonstrated to be linked by a special chiral transformation which removes the chiral field from the scalar--pseudoscalar sector. The chirally rotated axial vector meson field ($\tilde A_\mu$) transforms homogeneously under flavor rotations and may thus be dropped without violating chiral symmetry. The fermion determinant for static meson field configurations is computed by summing the discretized eigenvalues of the Dirac Hamiltonian. It is discussed how the local chiral transformation loses its unitary character in a finite model space. This technical issue proves to be crucial for the construction of the soliton within the Nambu--Jona--Lasinio model when the chirally rotated axial vector field is neglected. In the background of this soliton the valence quark is strongly bound, and its eigenenergy turns out to be negative. This important physical property which is usually generated only by non--vanishing axial vector is thus carried over by the simplification $\tilde A_\mu=0$.
|
hep-ph/0511040
|
Grigoris Panotopoulos
|
G. Panotopoulos
|
Sneutrino inflation in Gauss-Bonnet brane-world cosmology, the gravitino
problem and leptogenesis
|
one reference added, submitted to Nucl.Phys.B
|
Nucl.Phys. B745 (2006) 49-61
|
10.1016/j.nuclphysb.2006.04.002
| null |
hep-ph
| null |
We discuss sneutrino inflation in the brane-world scenario. We work in the
Randall-Sundrum type II brane-world, generalized with the introduction of the
Gauss-Bonnet term, a correction to the effective action in string theories. We
find that a viable inflationary model is obtained with a reheating temperature
appropriate to lead to the right baryon asymmetry and render the gravitino safe
for cosmology. In specific realizations we satisfy all the observational
constaints without the unnaturally small Yukawa couplings required in other
related approaches.
|
[
{
"created": "Fri, 4 Nov 2005 10:27:09 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Nov 2005 16:32:08 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Panotopoulos",
"G.",
""
]
] |
We discuss sneutrino inflation in the brane-world scenario. We work in the Randall-Sundrum type II brane-world, generalized with the introduction of the Gauss-Bonnet term, a correction to the effective action in string theories. We find that a viable inflationary model is obtained with a reheating temperature appropriate to lead to the right baryon asymmetry and render the gravitino safe for cosmology. In specific realizations we satisfy all the observational constaints without the unnaturally small Yukawa couplings required in other related approaches.
|
1005.1321
|
Vladimir V. Anisovich
|
A.V. Anisovich, V.V. Anisovich, M.A. Matveev, V.A. Nikonov, A.V.
Sarantsev and T.O. Vulfs
|
Quark-diquark Systematics of Baryons: Spectral Integral Equations for
Systems Composed by Light Quarks
|
13 pages, 2 figures
|
Phys.Atom.Nucl.74:418-425,2011
|
10.1134/S1063778811030045
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
For baryons composed by the light quarks ($q=u,d$) we write spectral integral
equation using the notion of two diquarks: (i) axial--vector state,
$D^{1}_{1}$, with the spin $S_D=1$ and isospin $I_D=1$ and (ii) scalar one,
$D^{0}_{0}$, with the spin $S_D=0$ and isospin $I_D=0$. We present spectral
integral equations for the $qD^{0}_{0}$ and $qD^{1}_{1}$ states taking into
account quark--diquark confinement interaction.
|
[
{
"created": "Sat, 8 May 2010 06:48:37 GMT",
"version": "v1"
}
] |
2011-04-05
|
[
[
"Anisovich",
"A. V.",
""
],
[
"Anisovich",
"V. V.",
""
],
[
"Matveev",
"M. A.",
""
],
[
"Nikonov",
"V. A.",
""
],
[
"Sarantsev",
"A. V.",
""
],
[
"Vulfs",
"T. O.",
""
]
] |
For baryons composed by the light quarks ($q=u,d$) we write spectral integral equation using the notion of two diquarks: (i) axial--vector state, $D^{1}_{1}$, with the spin $S_D=1$ and isospin $I_D=1$ and (ii) scalar one, $D^{0}_{0}$, with the spin $S_D=0$ and isospin $I_D=0$. We present spectral integral equations for the $qD^{0}_{0}$ and $qD^{1}_{1}$ states taking into account quark--diquark confinement interaction.
|
1909.00600
|
Christopher Jones
|
J. Garra Tic\'o, V. Gibson, S. C. Haines, C. R. Jones, M. Kenzie, G.
Lovell
|
Study of the sensitivity to CKM angle $\gamma$ under simultaneous
determination from multiple $B$ meson decay modes
| null |
Phys. Rev. D 102, 053003 (2020)
|
10.1103/PhysRevD.102.053003
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Several methods exist to measure $CP$ violation observables related to the
CKM unitarity triangle angle $\gamma$ using $B$ meson decays. These observables
are different for every $B$ meson decay considered, although the information
they contain on $\gamma$ is encoded in a similar way for all of them. This
paper describes a strategy for a simultaneous measurement of $\gamma$ using
several $B$ meson decays that takes into account possible correlations between
them. Sensitivity studies demonstrate that the simultaneous analysis of several
$B$ meson decay modes results in smaller uncertainties and improved statistical
behaviour compared to a combination of standalone measurements.
|
[
{
"created": "Mon, 2 Sep 2019 08:46:23 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Sep 2019 09:47:53 GMT",
"version": "v2"
},
{
"created": "Thu, 3 Oct 2019 08:49:03 GMT",
"version": "v3"
},
{
"created": "Thu, 31 Oct 2019 11:09:47 GMT",
"version": "v4"
},
{
"created": "Thu, 19 Dec 2019 16:50:57 GMT",
"version": "v5"
},
{
"created": "Wed, 22 Apr 2020 14:05:59 GMT",
"version": "v6"
},
{
"created": "Thu, 23 Apr 2020 12:24:14 GMT",
"version": "v7"
},
{
"created": "Fri, 11 Sep 2020 10:54:45 GMT",
"version": "v8"
}
] |
2020-09-14
|
[
[
"Ticó",
"J. Garra",
""
],
[
"Gibson",
"V.",
""
],
[
"Haines",
"S. C.",
""
],
[
"Jones",
"C. R.",
""
],
[
"Kenzie",
"M.",
""
],
[
"Lovell",
"G.",
""
]
] |
Several methods exist to measure $CP$ violation observables related to the CKM unitarity triangle angle $\gamma$ using $B$ meson decays. These observables are different for every $B$ meson decay considered, although the information they contain on $\gamma$ is encoded in a similar way for all of them. This paper describes a strategy for a simultaneous measurement of $\gamma$ using several $B$ meson decays that takes into account possible correlations between them. Sensitivity studies demonstrate that the simultaneous analysis of several $B$ meson decay modes results in smaller uncertainties and improved statistical behaviour compared to a combination of standalone measurements.
|
1007.5008
|
Changbo Fu
|
Changbo Fu, Thomas R. Gentile, and William M. Snow
|
Constraints on Possible Monopole-Dipole Interactions of WISPs from the
Transverse Relaxation Time of Polarized $^3$He Gas
|
Presented at the Fifth Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, June 28-July 2, 2010
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/publicdomain/
|
Various theories beyond the Standard Model predict new particles with masses
in the sub-eV range with very weak couplings to ordinary matter. A $P$-odd,
$T$-odd, spin-dependent interaction between polarized and unpolarized matter is
one such possibility. Such a monopole-dipole interaction can be induced by the
exchange of spin-$0$ particles. The presence of a possible monopole-dipole
interaction between fermion spins and unpolarized matter would cause an
decreased transverse spin relaxation time $T_{2}$ for a confined gas of
polarized nuclei. By reanalyzing previously existing data on the spin
relaxation times of polarized $^3$He in gas cells with pressure in the millibar
range and applying the well-established theory of spin relaxation for magnetic
field gradients to gradients in a possible monopole-dipole field, we present
new laboratory constraints on the strength and range of such an interaction.
These constraints represent to our knowledge the best limits on such
interactions for the neutron with ranges between $0.01$ cm and 1 cm.
|
[
{
"created": "Wed, 28 Jul 2010 15:31:17 GMT",
"version": "v1"
}
] |
2010-07-29
|
[
[
"Fu",
"Changbo",
""
],
[
"Gentile",
"Thomas R.",
""
],
[
"Snow",
"William M.",
""
]
] |
Various theories beyond the Standard Model predict new particles with masses in the sub-eV range with very weak couplings to ordinary matter. A $P$-odd, $T$-odd, spin-dependent interaction between polarized and unpolarized matter is one such possibility. Such a monopole-dipole interaction can be induced by the exchange of spin-$0$ particles. The presence of a possible monopole-dipole interaction between fermion spins and unpolarized matter would cause an decreased transverse spin relaxation time $T_{2}$ for a confined gas of polarized nuclei. By reanalyzing previously existing data on the spin relaxation times of polarized $^3$He in gas cells with pressure in the millibar range and applying the well-established theory of spin relaxation for magnetic field gradients to gradients in a possible monopole-dipole field, we present new laboratory constraints on the strength and range of such an interaction. These constraints represent to our knowledge the best limits on such interactions for the neutron with ranges between $0.01$ cm and 1 cm.
|
hep-ph/9710310
|
Jean Letessier
|
Jean Letessier, Johann Rafelski, Ahmed Tounsi
|
Strangeness in Pb-Pb Collisions at 158 A GeV
|
10 pages, LaTeX, 1 postscript figure, In press in Phys. Lett. B
|
Phys.Lett. B410 (1997) 315-322
|
10.1016/S0370-2693(97)00981-7
| null |
hep-ph nucl-th
| null |
We study relative strange particle abundances measured in Pb-Pb 158 A GeV
interactions. The thermal and chemical source parameters of these particles are
determined under reaction scenario hypothesis invoking confined and deconfined
hadronic matter.
|
[
{
"created": "Fri, 10 Oct 1997 07:45:08 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Letessier",
"Jean",
""
],
[
"Rafelski",
"Johann",
""
],
[
"Tounsi",
"Ahmed",
""
]
] |
We study relative strange particle abundances measured in Pb-Pb 158 A GeV interactions. The thermal and chemical source parameters of these particles are determined under reaction scenario hypothesis invoking confined and deconfined hadronic matter.
|
0704.1639
|
Sergey Afonin
|
S. S. Afonin
|
Parity doubling in particle physics
|
Version to appear in Int. J. Mod. Phys. A, 63 pages, 9 figures
|
Int.J.Mod.Phys.A22:4537-4586,2007
|
10.1142/S0217751X07037238
| null |
hep-ph
| null |
Parity doubling in excited hadrons is reviewed. Parity degeneracy in hadrons
was first experimentally observed 40 years ago. Recently new experimental data
on light mesons caused much excitement and renewed interest to the phenomenon,
which still remains to be enigmatic. The present retrospective review is an
attempt to trace the history of parity doubling phenomenon, thus providing a
kind of introduction to the subject. We begin with early approaches of 1960s
(Regge theory and dynamical symmetries) and end up with the latest trends
(manifestations of broader degeneracies and AdS/QCD). We show the evolution of
various ideas about parity doubling. The experimental evidence for this
phenomenon is scrutinized in the non-strange sector. Some experiments of 1960s
devoted to the search for missing non-strange bosons are re-examined and it is
argued that results of these experiments are encouraging from the modern
perspective.
|
[
{
"created": "Thu, 12 Apr 2007 18:44:07 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Apr 2007 18:12:54 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Sep 2007 15:34:40 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Afonin",
"S. S.",
""
]
] |
Parity doubling in excited hadrons is reviewed. Parity degeneracy in hadrons was first experimentally observed 40 years ago. Recently new experimental data on light mesons caused much excitement and renewed interest to the phenomenon, which still remains to be enigmatic. The present retrospective review is an attempt to trace the history of parity doubling phenomenon, thus providing a kind of introduction to the subject. We begin with early approaches of 1960s (Regge theory and dynamical symmetries) and end up with the latest trends (manifestations of broader degeneracies and AdS/QCD). We show the evolution of various ideas about parity doubling. The experimental evidence for this phenomenon is scrutinized in the non-strange sector. Some experiments of 1960s devoted to the search for missing non-strange bosons are re-examined and it is argued that results of these experiments are encouraging from the modern perspective.
|
hep-ph/9901309
|
Ellwanger
|
U. Ellwanger and C. Hugonie
|
Cascade Decays in the NMSSM
|
5 pages (LaTeX2e), to appear in the proceedings of the BTMSSM
subgroup of the Physics at Run II Workshop on Supersymmetry/Higgs
| null | null |
Orsay LPTHE-99-03
|
hep-ph
| null |
We study unconventional signatures of the NMSSM (the MSSM with an additional
gauge singlet) with a singlino LSP. Compared to sparticle production processes
in the MSSM, these consist in additional cascades (one or two additional l+ l-,
tau+ tau- or b bbar pairs or photons), possibly with macroscopically displaced
vertices with distances varying from millimeters to several meters.
|
[
{
"created": "Thu, 14 Jan 1999 10:22:48 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Ellwanger",
"U.",
""
],
[
"Hugonie",
"C.",
""
]
] |
We study unconventional signatures of the NMSSM (the MSSM with an additional gauge singlet) with a singlino LSP. Compared to sparticle production processes in the MSSM, these consist in additional cascades (one or two additional l+ l-, tau+ tau- or b bbar pairs or photons), possibly with macroscopically displaced vertices with distances varying from millimeters to several meters.
|
hep-ph/9801298
|
Daniel Gomez Dumm
|
D. Gomez Dumm, A. Pich
|
Long-distance contributions to the K_L --> mu+ mu- decay width
|
9 pages incl. 1 eps figure, REVTeX. Final version, to appear in Phys.
Rev. Lett
|
Phys.Rev.Lett. 80 (1998) 4633-4636
|
10.1103/PhysRevLett.80.4633
|
FTUV/98-3, IFIC/98-3
|
hep-ph
| null |
The dispersive two-photon contribution to the K_L --> mu+ mu- decay amplitude
is analyzed, using chiral perturbation theory techniques and large-N_C
considerations. A consistent description of the decays Pi^0 --> e+ e-, Eta -->
mu+ mu- and K_L --> mu+ mu- is obtained. As a byproduct, one predicts Br(Eta
--> e+ e-) = (5.8+-0.2) x 10^-9 and Br(K_L --> e+ e-) = (9.0+-0.4) x 10^-12.
|
[
{
"created": "Wed, 14 Jan 1998 12:14:25 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Apr 1998 15:01:57 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Dumm",
"D. Gomez",
""
],
[
"Pich",
"A.",
""
]
] |
The dispersive two-photon contribution to the K_L --> mu+ mu- decay amplitude is analyzed, using chiral perturbation theory techniques and large-N_C considerations. A consistent description of the decays Pi^0 --> e+ e-, Eta --> mu+ mu- and K_L --> mu+ mu- is obtained. As a byproduct, one predicts Br(Eta --> e+ e-) = (5.8+-0.2) x 10^-9 and Br(K_L --> e+ e-) = (9.0+-0.4) x 10^-12.
|
1507.04469
|
George Tsamis
|
George Tsamis (National Technical University of Athens, Physics
Department)
|
Reduction of couplings in the MSSM
|
10 pages, 3 figures, Contribution for the proceedings of the Corfu
Summer Institute 2014
|
PoS(CORFU2014)068
| null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present an application of the reduction of couplings program in the
minimal supersymmetric Standard Model (MSSM). We investigate if a functional
relation between $\alpha_1$ and $\alpha_2$ gauge couplings can be realized
which is Renormalization Group Invariant (RGI). Following the same procedure
for the top and bottom Yukawa couplings we end up with a prediction of a narrow
window for tan$\beta$, which is one of the basic parameters that determine the
light Higgs mass.
|
[
{
"created": "Thu, 16 Jul 2015 07:30:09 GMT",
"version": "v1"
}
] |
2015-07-17
|
[
[
"Tsamis",
"George",
"",
"National Technical University of Athens, Physics\n Department"
]
] |
We present an application of the reduction of couplings program in the minimal supersymmetric Standard Model (MSSM). We investigate if a functional relation between $\alpha_1$ and $\alpha_2$ gauge couplings can be realized which is Renormalization Group Invariant (RGI). Following the same procedure for the top and bottom Yukawa couplings we end up with a prediction of a narrow window for tan$\beta$, which is one of the basic parameters that determine the light Higgs mass.
|
hep-ph/9905430
|
Luis Gonzalez-Mestres
|
Luis Gonzalez-Mestres
|
Deformed Lorentz Symmetry and Ultra-High Energy Cosmic Rays
|
4 pages, contributed paper HE.1.3.16 to the 26th ICRC, Utah August
17-25, 1999
| null | null | null |
hep-ph astro-ph cond-mat hep-ex hep-th physics.hist-ph
| null |
Lorentz symmetry violation (LSV) is often discussed using models of the
$TH\epsilon \mu $ type which involve, basically, energy independent parameters.
However, if LSV is generated at the Planck scale or at some other fundamental
length scale, it can naturally preserve Lorentz symmetry as a low-energy limit
(deformed Lorentz symmetry, DLS). Deformed relativistic kinematics (DRK) would
be consistent with special relativity in the limit $k$ (wave vector) $\to ~0$
and allow for a deformed version of general relativity and gravitation. We
present an updated discussion of the possible implications of this pattern for
cosmic-ray physics at very high energy. A $\approx ~10^{-6}$ LSV at Planck
scale, leading to a DLS pattern, would potentially be enough to produce very
important observable effects on the properties of cosmic rays at the $\approx
\~10^{20} eV$ scale (absence of GZK cutoff, stability of unstable particles,
lower interaction rates, kinematical failure of the parton model...). We
compare our approach with more recent similar claims made by S. Coleman and S.
Glashow from models of the $TH\epsilon \mu$ type.
|
[
{
"created": "Fri, 21 May 1999 01:27:35 GMT",
"version": "v1"
},
{
"created": "Mon, 24 May 1999 15:36:16 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Gonzalez-Mestres",
"Luis",
""
]
] |
Lorentz symmetry violation (LSV) is often discussed using models of the $TH\epsilon \mu $ type which involve, basically, energy independent parameters. However, if LSV is generated at the Planck scale or at some other fundamental length scale, it can naturally preserve Lorentz symmetry as a low-energy limit (deformed Lorentz symmetry, DLS). Deformed relativistic kinematics (DRK) would be consistent with special relativity in the limit $k$ (wave vector) $\to ~0$ and allow for a deformed version of general relativity and gravitation. We present an updated discussion of the possible implications of this pattern for cosmic-ray physics at very high energy. A $\approx ~10^{-6}$ LSV at Planck scale, leading to a DLS pattern, would potentially be enough to produce very important observable effects on the properties of cosmic rays at the $\approx \~10^{20} eV$ scale (absence of GZK cutoff, stability of unstable particles, lower interaction rates, kinematical failure of the parton model...). We compare our approach with more recent similar claims made by S. Coleman and S. Glashow from models of the $TH\epsilon \mu$ type.
|
hep-ph/9905462
|
Kotkin G. L.
|
I.F.Ginzburg (Institute of Mathematics, Novosibirsk, Russia)
G.L.Kotkin (Novosibirsk State University)
|
Effective photon spectra for Photon Colliders
|
8 Latex page, 9 eps figure
|
Eur.Phys.J.C13:295-300,2000
|
10.1007/s100520000289
| null |
hep-ph
| null |
The luminosity distribution in the effective $\gamma\gamma$ mass at photon
collider has usually two peaks which are well separated: high energy peak with
mean energy spread 5-7% and wide low energy peak.The low energy peak depends
strongly on details of design it is unsuitablefor the study of New Physics
phenomena. We find simple approximte form of spectra of collided photons for
$\gamma\gamma$ and $e\gamma$ colliders wich convolution describes high energy
luminosity peak with good accuracy in the most essential preferable region of
parameters.
|
[
{
"created": "Mon, 24 May 1999 09:23:45 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Jun 1999 10:54:06 GMT",
"version": "v2"
}
] |
2011-09-13
|
[
[
"Ginzburg",
"I. F.",
"",
"Institute of Mathematics, Novosibirsk, Russia"
],
[
"Kotkin",
"G. L.",
"",
"Novosibirsk State University"
]
] |
The luminosity distribution in the effective $\gamma\gamma$ mass at photon collider has usually two peaks which are well separated: high energy peak with mean energy spread 5-7% and wide low energy peak.The low energy peak depends strongly on details of design it is unsuitablefor the study of New Physics phenomena. We find simple approximte form of spectra of collided photons for $\gamma\gamma$ and $e\gamma$ colliders wich convolution describes high energy luminosity peak with good accuracy in the most essential preferable region of parameters.
|
1307.6204
|
P. S. Bhupal Dev
|
P. S. Bhupal Dev, Dilip Kumar Ghosh, Nobuchika Okada, Ipsita Saha
|
Neutrino Mass and Dark Matter in light of recent AMS-02 results
|
19 pages, 7 figures, 3 tables; version accepted for publication in
Phys. Rev. D
|
Phys. Rev. D 89, 095001 (2014)
|
10.1103/PhysRevD.89.095001
|
MAN/HEP/2013/13
|
hep-ph astro-ph.CO astro-ph.HE hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study a simple extension of the Standard Model supplemented by an
electroweak triplet scalar field to accommodate small neutrino masses by the
type-II seesaw mechanism, while an additional singlet scalar field can play the
role of cold dark matter (DM) in our Universe. This DM candidate is leptophilic
for a wide range of model parameter space, and the lepton flux due to its
annihilation carries information about the neutrino mass hierarchy. Using the
recently released high precision data on positron fraction and flux from the
AMS-02 experiment, we examine the DM interpretation of the observed positron
excess in our model for two kinematically distinct scenarios with the DM and
triplet scalar masses (a) non-degenerate ($m_{\rm DM}\gg m_{\Delta}$), and (b)
quasi-degenerate ($m_{\rm DM} \simeq m_\Delta$). We find that a good fit to the
AMS-02 data can be obtained in both cases (a) and (b) with a normal hierarchy
of neutrino masses, while the inverted hierarchy case is somewhat disfavored.
Although we require a larger boost factor for the normal hierarchy case, this
is still consistent with the current upper limits derived from Fermi-LAT and
IceCube data for case (a). Moreover, the absence of an excess anti-proton flux
as suggested by PAMELA data sets an indirect upper limit on the DM-nucleon
spin-independent elastic scattering cross section which is stronger than the
existing DM direct detection bound from LUX in the AMS-02 preferred DM mass
range.
|
[
{
"created": "Tue, 23 Jul 2013 19:32:49 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Jan 2014 12:25:43 GMT",
"version": "v2"
},
{
"created": "Wed, 9 Apr 2014 16:47:18 GMT",
"version": "v3"
}
] |
2014-05-07
|
[
[
"Dev",
"P. S. Bhupal",
""
],
[
"Ghosh",
"Dilip Kumar",
""
],
[
"Okada",
"Nobuchika",
""
],
[
"Saha",
"Ipsita",
""
]
] |
We study a simple extension of the Standard Model supplemented by an electroweak triplet scalar field to accommodate small neutrino masses by the type-II seesaw mechanism, while an additional singlet scalar field can play the role of cold dark matter (DM) in our Universe. This DM candidate is leptophilic for a wide range of model parameter space, and the lepton flux due to its annihilation carries information about the neutrino mass hierarchy. Using the recently released high precision data on positron fraction and flux from the AMS-02 experiment, we examine the DM interpretation of the observed positron excess in our model for two kinematically distinct scenarios with the DM and triplet scalar masses (a) non-degenerate ($m_{\rm DM}\gg m_{\Delta}$), and (b) quasi-degenerate ($m_{\rm DM} \simeq m_\Delta$). We find that a good fit to the AMS-02 data can be obtained in both cases (a) and (b) with a normal hierarchy of neutrino masses, while the inverted hierarchy case is somewhat disfavored. Although we require a larger boost factor for the normal hierarchy case, this is still consistent with the current upper limits derived from Fermi-LAT and IceCube data for case (a). Moreover, the absence of an excess anti-proton flux as suggested by PAMELA data sets an indirect upper limit on the DM-nucleon spin-independent elastic scattering cross section which is stronger than the existing DM direct detection bound from LUX in the AMS-02 preferred DM mass range.
|
1002.0804
|
Boaz Keren-Zur
|
Boaz Keren-Zur and Yaron Oz
|
Hydrodynamics and the Detection of the QCD Axial Anomaly in Heavy Ion
Collisions
|
15 pages, 19 figures; v2: refs added, minor changes to the plots; v3,
comments added
|
JHEP 1006:006,2010
|
10.1007/JHEP06(2010)006
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the experimental implications of the axial current triangle
diagram anomaly in a hydrodynamic description of high density QCD. We propose a
signal of an enhanced production of spin-excited hadrons in the direction of
the rotation axis in off-central heavy ion collisions.
|
[
{
"created": "Wed, 3 Feb 2010 17:43:39 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Feb 2010 15:13:19 GMT",
"version": "v2"
},
{
"created": "Sun, 13 Jun 2010 08:55:39 GMT",
"version": "v3"
}
] |
2014-11-20
|
[
[
"Keren-Zur",
"Boaz",
""
],
[
"Oz",
"Yaron",
""
]
] |
We consider the experimental implications of the axial current triangle diagram anomaly in a hydrodynamic description of high density QCD. We propose a signal of an enhanced production of spin-excited hadrons in the direction of the rotation axis in off-central heavy ion collisions.
|
hep-ph/9505322
|
Robert Szalapski
|
K. Hagiwara, S. Matsumoto and R. Szalapski
|
Constraints on New Physics in the Electroweak Bosonic Sector from
Current Data and Future Experiments
|
documentstyle[preprint,aps,floats,cite,psfig,subeqn]{revtex}, one
figure compressed and encoded using uufiles, .ps version available via
anonymous ftp from ftp://ftp.kek.jp/kek/preprints/TH/TH-440
|
Phys.Lett.B357:411-418,1995
|
10.1016/0370-2693(95)00925-B
|
KEK-TH-440, KEK Preprint 95-42, KANAZAWA-95-06
|
hep-ph
| null |
Extensions of the Standard Model which involve a new scale, $\Lambda$, may,
for energies sufficiently small compared to this new scale, be expressed in
terms of operators with energy dimension greater than four. The coefficients of
just four SU(2)$\times$U(1)-gauge-invariant energy-dimension-six operators are
sufficient to parameterize the contributions of new physics in the electroweak
bosonic sector to electroweak precision measurements. In this letter we update
constraints on the coefficients of these four operators due to recent precision
measurements of electroweak observables. We further demonstrate how such
constraints may be improved by experiments at TRISTAN, LEP2 and at a future
linear $e^+e^-$ collider. The relationship of these operators to the oblique
parameters $S$, $T$ and $U$ is examined. Two of the operators contribute to a
non-standard running of the electroweak charge form-factors
$\overline{\alpha}(q^2)$, $\overline{s}^2(q^2)$, $\overline{g}_Z^2(q^2)$ and
$\overline{g}_W^2(q^2)$; in the special case where the coefficients of these
two vanish the operator analysis reduces to an analysis in terms of $S$, $T$
and $U$ with $U = 0$.
|
[
{
"created": "Wed, 17 May 1995 06:51:26 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Hagiwara",
"K.",
""
],
[
"Matsumoto",
"S.",
""
],
[
"Szalapski",
"R.",
""
]
] |
Extensions of the Standard Model which involve a new scale, $\Lambda$, may, for energies sufficiently small compared to this new scale, be expressed in terms of operators with energy dimension greater than four. The coefficients of just four SU(2)$\times$U(1)-gauge-invariant energy-dimension-six operators are sufficient to parameterize the contributions of new physics in the electroweak bosonic sector to electroweak precision measurements. In this letter we update constraints on the coefficients of these four operators due to recent precision measurements of electroweak observables. We further demonstrate how such constraints may be improved by experiments at TRISTAN, LEP2 and at a future linear $e^+e^-$ collider. The relationship of these operators to the oblique parameters $S$, $T$ and $U$ is examined. Two of the operators contribute to a non-standard running of the electroweak charge form-factors $\overline{\alpha}(q^2)$, $\overline{s}^2(q^2)$, $\overline{g}_Z^2(q^2)$ and $\overline{g}_W^2(q^2)$; in the special case where the coefficients of these two vanish the operator analysis reduces to an analysis in terms of $S$, $T$ and $U$ with $U = 0$.
|
2011.08919
|
Paolo Panci
|
Dario Buttazzo, Paolo Panci, Daniele Teresi, Robert Ziegler
|
Xenon1T excess from electron recoils of non-relativistic Dark Matter
|
5 pages, 4 figures; v2: updated experimental values for (g_2)_mu;
some clarifications and references added; conclusions unchanged; version
published in PLB
| null |
10.1016/j.physletb.2021.136310
|
CERN-TH-2020-165, TTP20-039, P3H-20-070
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that electron recoils induced by non-relativistic Dark Matter
interactions can fit well the recently reported Xenon1T excess, if they are
mediated by a light pseudo-scalar in the MeV range. This is due to the
favorable momentum-dependence of the resulting scattering rate, which partially
compensates the unfavorable kinematics that tends to strongly suppress keV
electron recoils. We study the phenomenology of the mediator and identify the
allowed parameter space of the Xenon1T excess which is compatible with all
experimental limits. We also find that the anomalous magnetic moments
$(g-2)_{\mu,e}$ of muons and electrons can be simultaneously explained in this
scenario, at the prize of a fine-tuning in the couplings of the order of a few
percent.
|
[
{
"created": "Tue, 17 Nov 2020 20:19:05 GMT",
"version": "v1"
},
{
"created": "Mon, 17 May 2021 08:02:23 GMT",
"version": "v2"
}
] |
2021-05-18
|
[
[
"Buttazzo",
"Dario",
""
],
[
"Panci",
"Paolo",
""
],
[
"Teresi",
"Daniele",
""
],
[
"Ziegler",
"Robert",
""
]
] |
We show that electron recoils induced by non-relativistic Dark Matter interactions can fit well the recently reported Xenon1T excess, if they are mediated by a light pseudo-scalar in the MeV range. This is due to the favorable momentum-dependence of the resulting scattering rate, which partially compensates the unfavorable kinematics that tends to strongly suppress keV electron recoils. We study the phenomenology of the mediator and identify the allowed parameter space of the Xenon1T excess which is compatible with all experimental limits. We also find that the anomalous magnetic moments $(g-2)_{\mu,e}$ of muons and electrons can be simultaneously explained in this scenario, at the prize of a fine-tuning in the couplings of the order of a few percent.
|
hep-ph/0306135
|
Klaus Moenig
|
V. Makarenko, K. Moenig, T. Shishkina
|
Measuring the Luminosity of a gamma gamma Collider with gamma gamma ->
l+ l- gamma Events
|
Final version, accepted by journal
|
Eur.Phys.J.C32S1:143-150,2003
|
10.1140/epjcd/s2003-01-011-7
|
LC-PHSM-2003-016
|
hep-ph
| null |
The process gamma gamma -> l+ l- is highly suppressed when the total angular
momentum of the two colliding photons is zero so that it cannot be used for
luminosity determination. This configuration, however is needed for Higgs
production at a photon collider. It will be shown that the process gamma gamma
-> l+ l- gamma can be used in this case to measure the luminosity of a collider
with a precision that is good enough not to limit the error on the partial
decay width Gamma(H -> gamma gamma).
|
[
{
"created": "Mon, 16 Jun 2003 12:12:31 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Aug 2003 10:33:11 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Makarenko",
"V.",
""
],
[
"Moenig",
"K.",
""
],
[
"Shishkina",
"T.",
""
]
] |
The process gamma gamma -> l+ l- is highly suppressed when the total angular momentum of the two colliding photons is zero so that it cannot be used for luminosity determination. This configuration, however is needed for Higgs production at a photon collider. It will be shown that the process gamma gamma -> l+ l- gamma can be used in this case to measure the luminosity of a collider with a precision that is good enough not to limit the error on the partial decay width Gamma(H -> gamma gamma).
|
1706.09989
|
Abdullah Khalil
|
Abdullah Khalil
|
NLO Rutherford Scattering and the Kinoshita-Lee-Nauenberg Theorem
|
MSc. thesis. Advisor: W. A. Horowitz (University of Cape Town)
| null | null | null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate to next-to-leading order accuracy the high-energy elastic
scattering cross section for an electron off of a classical point source. We
use the $\overline{\mathrm{MS}}$ renormalization scheme to tame the ultraviolet
divergences while the infrared singularities are dealt with using the well
known Kinoshita-Lee-Nauenberg theorem. We show for the first time how to
correctly apply the Kinoshita-Lee-Nauenberg theorem diagrammatically in a
next-to-leading order scattering process. We improve on previous works by
including all initial and final state soft radiative processes, including
absorption and an infinite sum of partially disconnected amplitudes. Crucially,
we exploit the Monotone Convergence Theorem to prove that our delicate
rearrangement of this formally divergent series is uniquely correct. This
rearrangement yields a factorization of the infinite contribution from the
initial state soft photons that then cancels in the physically observable cross
section. Since we use the $\overline{\mathrm{MS}}$ renormalization scheme, our
result is valid up to arbitrarily large momentum transfers between the source
and the scattered electron as long as $\alpha \log(1/\delta)\ll 1$ and $\alpha
\log(1/\delta)\log(\Delta/E)\ll 1$, where $\Delta$ and $\delta$ are the
experimental energy and angular resolutions, respectively, and $E$ is the
energy of the scattered electron. Our work aims at computing the NLO
corrections to the energy loss of a high energetic parton propagating in a
quark-gluon plasma.
|
[
{
"created": "Fri, 30 Jun 2017 00:51:53 GMT",
"version": "v1"
}
] |
2017-07-03
|
[
[
"Khalil",
"Abdullah",
""
]
] |
We calculate to next-to-leading order accuracy the high-energy elastic scattering cross section for an electron off of a classical point source. We use the $\overline{\mathrm{MS}}$ renormalization scheme to tame the ultraviolet divergences while the infrared singularities are dealt with using the well known Kinoshita-Lee-Nauenberg theorem. We show for the first time how to correctly apply the Kinoshita-Lee-Nauenberg theorem diagrammatically in a next-to-leading order scattering process. We improve on previous works by including all initial and final state soft radiative processes, including absorption and an infinite sum of partially disconnected amplitudes. Crucially, we exploit the Monotone Convergence Theorem to prove that our delicate rearrangement of this formally divergent series is uniquely correct. This rearrangement yields a factorization of the infinite contribution from the initial state soft photons that then cancels in the physically observable cross section. Since we use the $\overline{\mathrm{MS}}$ renormalization scheme, our result is valid up to arbitrarily large momentum transfers between the source and the scattered electron as long as $\alpha \log(1/\delta)\ll 1$ and $\alpha \log(1/\delta)\log(\Delta/E)\ll 1$, where $\Delta$ and $\delta$ are the experimental energy and angular resolutions, respectively, and $E$ is the energy of the scattered electron. Our work aims at computing the NLO corrections to the energy loss of a high energetic parton propagating in a quark-gluon plasma.
|
0706.4456
|
Hendrik van Hees
|
H. van Hees, V. Greco and R. Rapp
|
Heavy-Quark Kinetics in the QGP at LHC
|
2 pages, 6 figures. Contributed to Workshop on Heavy Ion Collisions
at the LHC: Last Call for Predictions, Geneva, Switzerland, 14 May - 8 Jun
2007 v2: acknowledgment included
|
Journal of Physics G 35, 1 (2008), p 125
|
10.1088/0954-3899/35/5/054001
| null |
hep-ph nucl-ex nucl-th
| null |
We present predictions for the nuclear modification factor and elliptic flow
of D and B mesons, as well as of their decay electrons, in semicentral Pb-Pb
collisions at the LHC. Heavy quarks are propagated in a Quark-Gluon Plasma
using a relativistic Langevin simulation with drag and diffusion coefficients
from elastic interactions with light anti-/quarks and gluons, including
non-perturbative resonance scattering. Hadronization at T_c is performed within
a combined coalescence-fragmentation scheme.
|
[
{
"created": "Fri, 29 Jun 2007 16:29:45 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Jun 2007 22:26:23 GMT",
"version": "v2"
}
] |
2008-04-22
|
[
[
"van Hees",
"H.",
""
],
[
"Greco",
"V.",
""
],
[
"Rapp",
"R.",
""
]
] |
We present predictions for the nuclear modification factor and elliptic flow of D and B mesons, as well as of their decay electrons, in semicentral Pb-Pb collisions at the LHC. Heavy quarks are propagated in a Quark-Gluon Plasma using a relativistic Langevin simulation with drag and diffusion coefficients from elastic interactions with light anti-/quarks and gluons, including non-perturbative resonance scattering. Hadronization at T_c is performed within a combined coalescence-fragmentation scheme.
|
hep-ph/0004084
|
Sergey Troshin
|
S. M. Troshin, N. E.Tyurin
|
Diffraction at the LHC - antishadow scattering?
|
8 pages, no figures
|
Eur.Phys.J.C21:679-682,2001
|
10.1007/s100520100768
| null |
hep-ph hep-ex
| null |
Numerical predictions for the global characteristics of proton-proton
interactions are given for the LHC energy. Possibilities for the discovery of
the antishadow scattering mode and its physical implications are discussed.
|
[
{
"created": "Sun, 9 Apr 2000 11:04:51 GMT",
"version": "v1"
}
] |
2009-01-07
|
[
[
"Troshin",
"S. M.",
""
],
[
"Tyurin",
"N. E.",
""
]
] |
Numerical predictions for the global characteristics of proton-proton interactions are given for the LHC energy. Possibilities for the discovery of the antishadow scattering mode and its physical implications are discussed.
|
2402.03802
|
Ulas Ozdem
|
U. \"Ozdem
|
Elucidating the nature of hidden-charm pentaquark states with
spin-$\frac{3}{2}$ through their electromagnetic form factors
|
12 pages, 2 tables, 1 figure, version accepted by Physics Letters B
| null | null | null |
hep-ph hep-ex hep-lat
|
http://creativecommons.org/licenses/by/4.0/
|
We perform a systematic study of the electromagnetic properties of exotic
states to shed light on their nature, which is still controversial and not
fully understood. The magnetic dipole and higher multipole moments of a
hadronic state are as fundamental a dynamical quantity as its mass, and they
contain valuable information about the deep structure underlying it. In the
present work, we have explored the magnetic dipole and higher multipole moments
of the hidden-charm pentaquarks with quantum number $J^P = 3/2^-$ using the QCD
light-cone sum rule method and different interpolating currents. The obtained
results show that different interpolating currents employed to probe
pentaquarks with the same quark content produce varying results for their
magnetic dipole and higher multipole moments at all. This can be interpreted to
mean that there is more than one hidden-charm pentaquark with identical quark
content but with different magnetic dipole and higher multipole moments. The
nature, internal structure, and quark-gluon configurations of these states can
be better understood by studying their electromagnetic properties.
|
[
{
"created": "Tue, 6 Feb 2024 08:40:14 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Feb 2024 14:58:04 GMT",
"version": "v2"
}
] |
2024-02-28
|
[
[
"Özdem",
"U.",
""
]
] |
We perform a systematic study of the electromagnetic properties of exotic states to shed light on their nature, which is still controversial and not fully understood. The magnetic dipole and higher multipole moments of a hadronic state are as fundamental a dynamical quantity as its mass, and they contain valuable information about the deep structure underlying it. In the present work, we have explored the magnetic dipole and higher multipole moments of the hidden-charm pentaquarks with quantum number $J^P = 3/2^-$ using the QCD light-cone sum rule method and different interpolating currents. The obtained results show that different interpolating currents employed to probe pentaquarks with the same quark content produce varying results for their magnetic dipole and higher multipole moments at all. This can be interpreted to mean that there is more than one hidden-charm pentaquark with identical quark content but with different magnetic dipole and higher multipole moments. The nature, internal structure, and quark-gluon configurations of these states can be better understood by studying their electromagnetic properties.
|
hep-ph/9701214
|
Charles J. Horowitz
|
C. J. Horowitz and J. Piekarewicz
|
Macroscopic Parity Violation and Supernova Asymmetries
|
Nine pages Revtex, two postscript figures (included)
|
Nucl.Phys. A640 (1998) 281-290
|
10.1016/S0375-9474(98)00444-8
|
IU/NTC 96-18
|
hep-ph astro-ph nucl-th
| null |
Core collapse supernovae are dominated by weakly interacting neutrinos. This
provides a unique opportunity for macroscopic parity violation. We speculate
that parity violation in a strong magnetic field can lead to an asymmetry in
the explosion and a recoil of the newly formed neutron star. We estimate the
asymmetry from neutrino-polarized-neutron elastic scattering, polarized
electron capture and neutrino-nucleus elastic scattering in a (partially)
polarized electron gas.
|
[
{
"created": "Fri, 3 Jan 1997 19:27:13 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Horowitz",
"C. J.",
""
],
[
"Piekarewicz",
"J.",
""
]
] |
Core collapse supernovae are dominated by weakly interacting neutrinos. This provides a unique opportunity for macroscopic parity violation. We speculate that parity violation in a strong magnetic field can lead to an asymmetry in the explosion and a recoil of the newly formed neutron star. We estimate the asymmetry from neutrino-polarized-neutron elastic scattering, polarized electron capture and neutrino-nucleus elastic scattering in a (partially) polarized electron gas.
|
2211.00510
|
Guo-Liang Yu
|
Guo-Liang Yu, Zhen-Yu Li, Zhi-Gang Wang, Jie Lu and Meng Yan
|
Systematic analysis of doubly charmed baryons $\Xi_{cc}$ and
$\Omega_{cc}$
| null |
Eur. Phys. J. A (2023) 59:126
|
10.1140/epja/s10050-023-01044-1
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In this work, we perform a systematic study of the mass spectra, the root
mean square(r.m.s.) radii and the radial density distributions of the doubly
charmed baryons $\Xi_{cc}$ and $\Omega_{cc}$. The calculations are carried out
in the frame work of Godfrey-Isgur (GI) relativized quark model, where the
baryon is regarded as a real three-body system of quarks. Our results show that
the excited energy of doubly charmed baryon with $\rho$-mode is lower than
those of the $\lambda$-mode and $\lambda$-$\rho$ mixing mode, which indicates
that the lowest state is dominated by the $\rho$-mode. According to this
conclusion, we systematically investigate the mass spectra, the r.m.s. radii of
the ground and excited states($1S\sim4S$, $1P\sim4P$, $1D\sim4D$, $1F\sim4F$
and $1G\sim4G$) with $\rho$-mode. Using the wave functions obtained from quark
model, we also study the radial density distributions. Finally, with the
predicated mass spectra, the Regge trajectories of $\Xi_{cc}$ and $\Omega_{cc}$
in the ($J$,$M^{2}$) plane are constructed, and the slopes, intercepts are
determined by linear fitting. It is found that model predicted masses fit
nicely to the constructed Regge trajectories.
|
[
{
"created": "Tue, 1 Nov 2022 14:52:59 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Nov 2022 01:40:30 GMT",
"version": "v2"
},
{
"created": "Thu, 6 Jul 2023 09:09:06 GMT",
"version": "v3"
}
] |
2023-07-07
|
[
[
"Yu",
"Guo-Liang",
""
],
[
"Li",
"Zhen-Yu",
""
],
[
"Wang",
"Zhi-Gang",
""
],
[
"Lu",
"Jie",
""
],
[
"Yan",
"Meng",
""
]
] |
In this work, we perform a systematic study of the mass spectra, the root mean square(r.m.s.) radii and the radial density distributions of the doubly charmed baryons $\Xi_{cc}$ and $\Omega_{cc}$. The calculations are carried out in the frame work of Godfrey-Isgur (GI) relativized quark model, where the baryon is regarded as a real three-body system of quarks. Our results show that the excited energy of doubly charmed baryon with $\rho$-mode is lower than those of the $\lambda$-mode and $\lambda$-$\rho$ mixing mode, which indicates that the lowest state is dominated by the $\rho$-mode. According to this conclusion, we systematically investigate the mass spectra, the r.m.s. radii of the ground and excited states($1S\sim4S$, $1P\sim4P$, $1D\sim4D$, $1F\sim4F$ and $1G\sim4G$) with $\rho$-mode. Using the wave functions obtained from quark model, we also study the radial density distributions. Finally, with the predicated mass spectra, the Regge trajectories of $\Xi_{cc}$ and $\Omega_{cc}$ in the ($J$,$M^{2}$) plane are constructed, and the slopes, intercepts are determined by linear fitting. It is found that model predicted masses fit nicely to the constructed Regge trajectories.
|
hep-ph/0105020
|
joerg Aichelin
|
Hans-Joachim Drescher, Joerg Aichelin, Klaus Werner
|
Strangeness Suppression in Proton-Proton Collisions
|
7 Figures, 4 Pages
|
Phys.Rev. D65 (2002) 057501
|
10.1103/PhysRevD.65.057501
| null |
hep-ph
| null |
We analyse strangeness production in proton-proton (pp) collisions at SPS and
RHIC energies, using the recently advanced NeXus approach. After having
verified that the model reproduces well the existing data, we interpret the
results: strangeness is suppressed in proton-proton collisions at SPS energy as
compared to electron-positron (e+e-) annihilation due to the limited masses of
the strings produced in the reaction, whereas high energy pp and e+e-
collisions agree quantitatively . Thus strangeness suppression at SPS energies
is a consequence of the limited phase-space available in string fragmentation.
|
[
{
"created": "Wed, 2 May 2001 15:03:16 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Drescher",
"Hans-Joachim",
""
],
[
"Aichelin",
"Joerg",
""
],
[
"Werner",
"Klaus",
""
]
] |
We analyse strangeness production in proton-proton (pp) collisions at SPS and RHIC energies, using the recently advanced NeXus approach. After having verified that the model reproduces well the existing data, we interpret the results: strangeness is suppressed in proton-proton collisions at SPS energy as compared to electron-positron (e+e-) annihilation due to the limited masses of the strings produced in the reaction, whereas high energy pp and e+e- collisions agree quantitatively . Thus strangeness suppression at SPS energies is a consequence of the limited phase-space available in string fragmentation.
|
1507.04293
|
S\'ebastien Lord
|
Mohammad Ahmady, S\'ebastien Lord, Ruben Sandapen
|
AdS/QCD predictions for semileptonic and rare B decays to $\rho$ and
$K^*$ vector mesons
|
7 pages, 5 figures. Contribution to the proceedings of the DIS 2015
conference in Dallas, Texas, April 27th to May 1st 2015
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The light front wavefunction obtained from anti-de Sitter Quantum
Chromodynamics is used to calculate the light cone distribution amplitudes for
$\rho$ and $K^*$ vector mesons. These distribution amplitudes are then utilized
to calculate the $B \to \rho ,\; K^*$ transition form factors via light cone
sum rules. Two-parameter fits of our results for low to intermediate momentum
transfer $q^2$ that includes the QCD lattice data at high $q^2$ are presented.
Consequently, we give predictions for the semileptoic $B \to \rho \ell \nu$ and
dileptonic $B \to K^* \mu^+ \mu^-$ decays.
|
[
{
"created": "Wed, 15 Jul 2015 16:49:40 GMT",
"version": "v1"
}
] |
2015-07-16
|
[
[
"Ahmady",
"Mohammad",
""
],
[
"Lord",
"Sébastien",
""
],
[
"Sandapen",
"Ruben",
""
]
] |
The light front wavefunction obtained from anti-de Sitter Quantum Chromodynamics is used to calculate the light cone distribution amplitudes for $\rho$ and $K^*$ vector mesons. These distribution amplitudes are then utilized to calculate the $B \to \rho ,\; K^*$ transition form factors via light cone sum rules. Two-parameter fits of our results for low to intermediate momentum transfer $q^2$ that includes the QCD lattice data at high $q^2$ are presented. Consequently, we give predictions for the semileptoic $B \to \rho \ell \nu$ and dileptonic $B \to K^* \mu^+ \mu^-$ decays.
|
1108.0050
|
Andrej Arbuzov
|
A. B. Arbuzov, M. K. Volkov
|
Two-photon decays and photoproduction on electrons of $\eta(550)$,
$\eta'(958)$, $\eta(1295)$, and $\eta(1475)$ mesons
|
4 pages, discussion of results is extended
| null |
10.1103/PhysRevC.84.058201
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Electromagnetic interactions of the ground and first radial excited states of
$\eta$ and $\eta'$ mesons in the framework of the extended $U(3)\times U(3)$
NJL model are considered. The radial excitations are described with the help of
polynomial form factor of the second order over the inner quark momentum. The
solution of the $U_A(1)$ problem by means of 't Hooft interaction is taken into
account. For diagonalization of the free Lagrangian the $4\times4$ mixing
matrix is used. Two-photon decay widths of the ground $\eta$ and $\eta'$ meson
are found to be in a satisfactory agreement with the experiment. Predictions
for the two-photon decay widths of $\eta(1295)$ and $\eta(1475)$ are given. The
probabilities of eta meson production by two-photon mechanism in $e^+e^-$
collisions and of their photoproduction on electrons are calculated.
|
[
{
"created": "Sat, 30 Jul 2011 07:44:33 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Nov 2011 14:30:02 GMT",
"version": "v2"
}
] |
2013-05-29
|
[
[
"Arbuzov",
"A. B.",
""
],
[
"Volkov",
"M. K.",
""
]
] |
Electromagnetic interactions of the ground and first radial excited states of $\eta$ and $\eta'$ mesons in the framework of the extended $U(3)\times U(3)$ NJL model are considered. The radial excitations are described with the help of polynomial form factor of the second order over the inner quark momentum. The solution of the $U_A(1)$ problem by means of 't Hooft interaction is taken into account. For diagonalization of the free Lagrangian the $4\times4$ mixing matrix is used. Two-photon decay widths of the ground $\eta$ and $\eta'$ meson are found to be in a satisfactory agreement with the experiment. Predictions for the two-photon decay widths of $\eta(1295)$ and $\eta(1475)$ are given. The probabilities of eta meson production by two-photon mechanism in $e^+e^-$ collisions and of their photoproduction on electrons are calculated.
|
hep-ph/0611174
|
Alejandro Lorca
|
A. Ferroglia, A. Lorca and J.J. van der Bij
|
The Z' reconsidered
| null |
Annalen Phys.16:563-578,2007
|
10.1002/andp.200710249
|
Freiburg-THEP 06/15
|
hep-ph
| null |
We consider the extension of the standard model with an arbitrary number of
U(1) gauge fields coupled to baryon-minus-lepton number and/or hypercharge.
Under the assumption that A^b_FB from the LEP1 experiment is an unlucky
fluctuation, we find moderate evidence for the presence of such fields in the
precision electroweak data. A relatively large range of the Higgs boson mass is
allowed. We discuss the phenomenology of the extra U(1) fields.
|
[
{
"created": "Mon, 13 Nov 2006 17:22:56 GMT",
"version": "v1"
}
] |
2011-03-23
|
[
[
"Ferroglia",
"A.",
""
],
[
"Lorca",
"A.",
""
],
[
"van der Bij",
"J. J.",
""
]
] |
We consider the extension of the standard model with an arbitrary number of U(1) gauge fields coupled to baryon-minus-lepton number and/or hypercharge. Under the assumption that A^b_FB from the LEP1 experiment is an unlucky fluctuation, we find moderate evidence for the presence of such fields in the precision electroweak data. A relatively large range of the Higgs boson mass is allowed. We discuss the phenomenology of the extra U(1) fields.
|
hep-ph/9606205
|
Zhang Daxin
|
Da-Xin Zhang
|
Theoretical Update on Two Non-Resonant Three-Body Channels in Charmed
Meson Decays
|
13 pages with 2 figures included. To be published
|
Phys.Lett. B382 (1996) 421-425
|
10.1016/0370-2693(96)00693-4
|
TECHNION-PH-96-4
|
hep-ph
| null |
Predictions of two channels in the three-bod decays of the charmed mesons are
made within the heavy hadron chiral perturbation theory. There still exists the
problem that the theoretical expectation is too small compared to the
experimental data.
|
[
{
"created": "Mon, 3 Jun 1996 11:25:50 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"Zhang",
"Da-Xin",
""
]
] |
Predictions of two channels in the three-bod decays of the charmed mesons are made within the heavy hadron chiral perturbation theory. There still exists the problem that the theoretical expectation is too small compared to the experimental data.
|
hep-ph/0411112
|
Andreas Vogt
|
S. Moch (DESY, Zeuthen), J.A.M. Vermaseren (NIKHEF, Amsterdam) and A.
Vogt (Durham Univ., IPPP)
|
The Longitudinal Structure Function at the Third Order
|
11 pages, LaTeX, 4 eps-figures. DESY preprint number corrected
|
Phys.Lett. B606 (2005) 123-129
|
10.1016/j.physletb.2004.11.063
|
DESY 04-210, SFB/CPP-04-65, NIKHEF 04-013, DCPT/04/130, IPPP/04/65
|
hep-ph
| null |
We compute the complete third-order contributions to the coefficient
functions for the longitudinal structure function F_L, thus completing the
next-to-next-to-leading order (NNLO) description of unpolarized electromagnetic
deep-inelastic scattering in massless perturbative QCD. Our exact results agree
with determinations of low even-integer Mellin moments and of the leading
small-x terms in the flavour-singlet sector. In this letter we present compact
and accurate parametrizations of the results and illustrate the numerical
impact of the NNLO corrections.
|
[
{
"created": "Mon, 8 Nov 2004 15:44:26 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Nov 2004 13:48:14 GMT",
"version": "v2"
}
] |
2010-04-05
|
[
[
"Moch",
"S.",
"",
"DESY, Zeuthen"
],
[
"Vermaseren",
"J. A. M.",
"",
"NIKHEF, Amsterdam"
],
[
"Vogt",
"A.",
"",
"Durham Univ., IPPP"
]
] |
We compute the complete third-order contributions to the coefficient functions for the longitudinal structure function F_L, thus completing the next-to-next-to-leading order (NNLO) description of unpolarized electromagnetic deep-inelastic scattering in massless perturbative QCD. Our exact results agree with determinations of low even-integer Mellin moments and of the leading small-x terms in the flavour-singlet sector. In this letter we present compact and accurate parametrizations of the results and illustrate the numerical impact of the NNLO corrections.
|
1901.04497
|
Ian Moult
|
AnJie Gao, Hai Tao Li, Ian Moult, and Hua Xing Zhu
|
The Transverse Energy-Energy Correlator in the Back-to-Back Limit
|
5 pages + Supplemental Material
|
Phys. Rev. Lett. 123, 062001 (2019)
|
10.1103/PhysRevLett.123.062001
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present an operator based factorization formula for the transverse
energy-energy correlator (TEEC) hadron collider event shape in the back-to-back
(dijet) limit. This factorization formula exhibits a remarkably symmetric form,
being a projection onto a scattering plane of a more standard transverse
momentum dependent factorization. Soft radiation is incorporated through a
dijet soft function, which can be elegantly obtained to next-to-next-to-leading
order (NNLO) due to the symmetries of the problem. We present numerical results
for the TEEC resummed to next-to-next-to-leading logarithm (NNLL) matched to
fixed order at the LHC. Our results constitute the first NNLL resummation for a
dijet event shape observable at a hadron collider, and the first analytic
result for a hadron collider dijet soft function at NNLO. We anticipate that
the theoretical simplicity of the TEEC observable will make it indispensable
for precision studies of QCD at the LHC, and as a playground for theoretical
studies of factorization and its violation.
|
[
{
"created": "Mon, 14 Jan 2019 19:00:02 GMT",
"version": "v1"
}
] |
2019-08-14
|
[
[
"Gao",
"AnJie",
""
],
[
"Li",
"Hai Tao",
""
],
[
"Moult",
"Ian",
""
],
[
"Zhu",
"Hua Xing",
""
]
] |
We present an operator based factorization formula for the transverse energy-energy correlator (TEEC) hadron collider event shape in the back-to-back (dijet) limit. This factorization formula exhibits a remarkably symmetric form, being a projection onto a scattering plane of a more standard transverse momentum dependent factorization. Soft radiation is incorporated through a dijet soft function, which can be elegantly obtained to next-to-next-to-leading order (NNLO) due to the symmetries of the problem. We present numerical results for the TEEC resummed to next-to-next-to-leading logarithm (NNLL) matched to fixed order at the LHC. Our results constitute the first NNLL resummation for a dijet event shape observable at a hadron collider, and the first analytic result for a hadron collider dijet soft function at NNLO. We anticipate that the theoretical simplicity of the TEEC observable will make it indispensable for precision studies of QCD at the LHC, and as a playground for theoretical studies of factorization and its violation.
|
hep-ph/9311203
|
A. P. Martin
|
A.C.Davis and A.P.Martin
|
Global Strings and the Aharonov-Bohm Effect
|
11 pages, DAMTP 93-50
|
Nucl.Phys. B419 (1994) 341-351
|
10.1016/0550-3213(94)90046-9
| null |
hep-ph cond-mat
| null |
When a fermion interacts with a global vortex or cosmic string a solenoidal
"gauge" field is induced. This results in a non-trivial scattering
cross-section. For scalars and non-relativistic fermions the cross-section is
similar to that of Aharonov and Bohm, but with corrections. A cosmological
example is compared to one in liquid He$^{3}$-A and important differences are
discovered.
|
[
{
"created": "Mon, 1 Nov 1993 15:15:19 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Apr 1994 08:56:00 GMT",
"version": "v2"
}
] |
2009-10-22
|
[
[
"Davis",
"A. C.",
""
],
[
"Martin",
"A. P.",
""
]
] |
When a fermion interacts with a global vortex or cosmic string a solenoidal "gauge" field is induced. This results in a non-trivial scattering cross-section. For scalars and non-relativistic fermions the cross-section is similar to that of Aharonov and Bohm, but with corrections. A cosmological example is compared to one in liquid He$^{3}$-A and important differences are discovered.
|
2302.10028
|
Jose Bordes
|
Jose Bordes (1), HM Chan (2) and ST Tsou (3) ((1) Departament Fisica
Teorica and IFIC, CSIC-Universitat de Valencia (Spain), (2) Rutherford
Appleton Laboratory (UK) (3) Mathematical Institute, University of Oxford
(UK))
|
A vacuum transition in the FSM with a possible new take on the horizon
problem in cosmology
|
Inserted paragraph after eq. (4) and before equation (7), explaining
the notation. Changed paragraph E1 in page 10. Added paragraph before the
last in section 3. New references added 30 and 31
| null | null | null |
hep-ph astro-ph.CO
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
The framed standard model (FSM), constructed to explain the empirical mass
and mixing patterns of quarks and leptons, gives the same result as the
standard model in almost all areas in particle physics where it has been
successfully applied, except for a few deviations such as the W mass and the
g-2 of muons, where experiment is showing departures from what SM predicts. It
predicts further the existence of a hidden sector of particles which may
function as dark matter. In this paper, we first note that the above results
involve the FSM undergoing a vacuum transition at a scale of around 17 MeV,
where the vev's of the colour framons which are all nonzero above that scale
acquire some vanishing components below it. This implies that the metric
pertaining to these vanishing components would vanish also. Consequences should
then ensue, mostly in the unknown hidden sector where empirical confirmation is
hard at present to come by, but they give small reflections in the standard
sector, some of which may have already been seen. However, one notes that if
one imagines colour to be embedded, Kaluza-Klein fashion, into a higher
dimensional space-time, then this VTR1 would cause 2 of the compactified
dimensions to collapse. This might mean that when the universe cooled to the
corresponding temperature of $10^{11}$K when it was about $10^{-3}$s old, this
VTR1 collapse would cause the 3 spatial dimensions of the universe to expand to
compensate. The resultant expansion is estimated, using FSM parameters
previously determined from particle physics, to be capable, when extrapolated
backwards in time, of bringing the present universe back inside the then
horizon, solving thus formally the horizon problem. Besides, VTR1 being a
global phenomenon in the FSM, it would switch on and off automatically and
simultaneously over all space, thus requiring no additional strategy for a
graceful exit.
|
[
{
"created": "Mon, 20 Feb 2023 15:20:52 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Aug 2023 11:07:56 GMT",
"version": "v2"
}
] |
2023-08-24
|
[
[
"Bordes",
"Jose",
""
],
[
"Chan",
"HM",
""
],
[
"Tsou",
"ST",
""
]
] |
The framed standard model (FSM), constructed to explain the empirical mass and mixing patterns of quarks and leptons, gives the same result as the standard model in almost all areas in particle physics where it has been successfully applied, except for a few deviations such as the W mass and the g-2 of muons, where experiment is showing departures from what SM predicts. It predicts further the existence of a hidden sector of particles which may function as dark matter. In this paper, we first note that the above results involve the FSM undergoing a vacuum transition at a scale of around 17 MeV, where the vev's of the colour framons which are all nonzero above that scale acquire some vanishing components below it. This implies that the metric pertaining to these vanishing components would vanish also. Consequences should then ensue, mostly in the unknown hidden sector where empirical confirmation is hard at present to come by, but they give small reflections in the standard sector, some of which may have already been seen. However, one notes that if one imagines colour to be embedded, Kaluza-Klein fashion, into a higher dimensional space-time, then this VTR1 would cause 2 of the compactified dimensions to collapse. This might mean that when the universe cooled to the corresponding temperature of $10^{11}$K when it was about $10^{-3}$s old, this VTR1 collapse would cause the 3 spatial dimensions of the universe to expand to compensate. The resultant expansion is estimated, using FSM parameters previously determined from particle physics, to be capable, when extrapolated backwards in time, of bringing the present universe back inside the then horizon, solving thus formally the horizon problem. Besides, VTR1 being a global phenomenon in the FSM, it would switch on and off automatically and simultaneously over all space, thus requiring no additional strategy for a graceful exit.
|
1901.07788
|
Piotr Lebiedowicz
|
Piotr Lebiedowicz, Otto Nachtmann, Antoni Szczurek
|
Extracting the pomeron-pomeron-$f_{2}(1270)$ coupling in the $p p \to p
p \pi^{+} \pi^{-}$ reaction through angular distributions of the pions
|
22 pages, 10 figures
|
Phys. Rev. D 101, 034008 (2020)
|
10.1103/PhysRevD.101.034008
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss how to extract the pomeron-pomeron-$f_2(1270)$ ($\mathbb{P}
\mathbb{P} f_2(1270)$) coupling within the tensor-pomeron model. The general
$\mathbb{P} \mathbb{P} f_2(1270)$ coupling is a combination of seven basic
couplings (tensorial structures). To study these tensorial structures we
propose to measure the central-exclusive production of a $\pi^+ \pi^-$ pair in
the invariant mass region of the $f_2(1270)$ meson. An analysis of angular
distributions in the $\pi^+ \pi^-$ rest system, using the Collins-Soper (CS)
and the Gottfried-Jackson (GJ) frames, turns out to be particularly relevant
for our purpose. For both frames the $\cos\theta_{\pi^{+}}$ and
$\phi_{\pi^{+}}$ distributions are discussed. We find that the azimuthal angle
distributions in these frames are fairly sensitive to the choice of the
$\mathbb{P} \mathbb{P} f_2$ coupling. We show results for the resonance case
alone as well as when the dipion continuum is included. We show the influence
of the experimental cuts on the angular distributions in the context of
dedicated experimental studies at RHIC and LHC energies. Absorption corrections
are included for our final distributions.
|
[
{
"created": "Wed, 23 Jan 2019 09:41:08 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Dec 2019 18:06:42 GMT",
"version": "v2"
}
] |
2020-02-19
|
[
[
"Lebiedowicz",
"Piotr",
""
],
[
"Nachtmann",
"Otto",
""
],
[
"Szczurek",
"Antoni",
""
]
] |
We discuss how to extract the pomeron-pomeron-$f_2(1270)$ ($\mathbb{P} \mathbb{P} f_2(1270)$) coupling within the tensor-pomeron model. The general $\mathbb{P} \mathbb{P} f_2(1270)$ coupling is a combination of seven basic couplings (tensorial structures). To study these tensorial structures we propose to measure the central-exclusive production of a $\pi^+ \pi^-$ pair in the invariant mass region of the $f_2(1270)$ meson. An analysis of angular distributions in the $\pi^+ \pi^-$ rest system, using the Collins-Soper (CS) and the Gottfried-Jackson (GJ) frames, turns out to be particularly relevant for our purpose. For both frames the $\cos\theta_{\pi^{+}}$ and $\phi_{\pi^{+}}$ distributions are discussed. We find that the azimuthal angle distributions in these frames are fairly sensitive to the choice of the $\mathbb{P} \mathbb{P} f_2$ coupling. We show results for the resonance case alone as well as when the dipion continuum is included. We show the influence of the experimental cuts on the angular distributions in the context of dedicated experimental studies at RHIC and LHC energies. Absorption corrections are included for our final distributions.
|
1408.1652
|
Erik Schumacher
|
Miguel D. Campos, A. E. C\'arcamo Hern\'andez, Heinrich P\"as, Erik
Schumacher
|
Higgs $\rightarrow$ $\mu\tau$ as an indication for $S_4$ flavor symmetry
|
15+9 pages, 7 figures, updated for publication in PRD
|
Phys. Rev. D 91, 116011 (2015)
|
10.1103/PhysRevD.91.116011
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Lepton flavor violating Higgs decays can arise in flavor symmetry models
where the Higgs sector is responsible for both the electroweak and the flavor
symmetry breaking. Here we advocate an $S_4$ three-Higgs-doublet model where
tightly constrained flavor changing neutral currents are suppressed by a
remnant $Z_3$ symmetry. A small breaking of this $Z_3$ symmetry can explain the
$2.4\,\sigma$ excess of Higgs decay final states with a $\mu \tau $ topology
reported recently by CMS if the new neutral scalars are light. The model also
predicts sizable rates for lepton flavor violating Higgs decays in the $e\tau $
and $e \mu$ channels because of the unifying $S_4$ flavor symmetry.
|
[
{
"created": "Thu, 7 Aug 2014 17:00:52 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Jun 2015 19:52:47 GMT",
"version": "v2"
}
] |
2015-07-01
|
[
[
"Campos",
"Miguel D.",
""
],
[
"Hernández",
"A. E. Cárcamo",
""
],
[
"Päs",
"Heinrich",
""
],
[
"Schumacher",
"Erik",
""
]
] |
Lepton flavor violating Higgs decays can arise in flavor symmetry models where the Higgs sector is responsible for both the electroweak and the flavor symmetry breaking. Here we advocate an $S_4$ three-Higgs-doublet model where tightly constrained flavor changing neutral currents are suppressed by a remnant $Z_3$ symmetry. A small breaking of this $Z_3$ symmetry can explain the $2.4\,\sigma$ excess of Higgs decay final states with a $\mu \tau $ topology reported recently by CMS if the new neutral scalars are light. The model also predicts sizable rates for lepton flavor violating Higgs decays in the $e\tau $ and $e \mu$ channels because of the unifying $S_4$ flavor symmetry.
|
1812.08513
|
Xingwei He
|
Xing-Wei He, Hua-Rong Wei and Fu-Hu Liu
|
Chemical potentials of light hadrons and quarks from yield ratios of
negative to positive particles in high energy $pp$ collisions
|
13 pages, 5 figures
|
J.Phys.G:Nucl.Part.Phys.46(2019)025102
|
10.1088/1361-6471/aaf5dc
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We describe the transverse momentum spectra of $\pi^\pm$, $K^\pm$, $p$, and
$\bar{p}$ produced in proton-proton ($pp$) collisions at different collision
energies by using a Tsallis-Pareto-type function, and obtain the yield ratios,
$k_{\pi}$, $k_{K}$, and $k_{p}$, of negative to positive particles from the
fitting results of transverse momentum spectra and the extracted normalization
constants. The transverse momentum dependent and energy dependent chemical
potentials of light hadrons ($\pi$, $K$, and $p$) and quarks ($u$, $d$, and
$s$) in $pp$ collisions are then extracted successively from the yield ratios.
The six types of transverse momentum dependent chemical potentials show the
trend of being close to zero in low-$p_T$ region and away from zero in
high-$p_T$ region. Meanwhile, the energy dependent chemical potentials seem to
decrease slightly with the increase of the collision energy, and the limiting
values of the six types of chemical potentials are zero at very high energy in
$pp$ collisions, which confirms that the partonic interactions possibly play an
important role at RHIC and LHC, especially at LHC.
|
[
{
"created": "Thu, 20 Dec 2018 12:25:40 GMT",
"version": "v1"
}
] |
2019-03-13
|
[
[
"He",
"Xing-Wei",
""
],
[
"Wei",
"Hua-Rong",
""
],
[
"Liu",
"Fu-Hu",
""
]
] |
We describe the transverse momentum spectra of $\pi^\pm$, $K^\pm$, $p$, and $\bar{p}$ produced in proton-proton ($pp$) collisions at different collision energies by using a Tsallis-Pareto-type function, and obtain the yield ratios, $k_{\pi}$, $k_{K}$, and $k_{p}$, of negative to positive particles from the fitting results of transverse momentum spectra and the extracted normalization constants. The transverse momentum dependent and energy dependent chemical potentials of light hadrons ($\pi$, $K$, and $p$) and quarks ($u$, $d$, and $s$) in $pp$ collisions are then extracted successively from the yield ratios. The six types of transverse momentum dependent chemical potentials show the trend of being close to zero in low-$p_T$ region and away from zero in high-$p_T$ region. Meanwhile, the energy dependent chemical potentials seem to decrease slightly with the increase of the collision energy, and the limiting values of the six types of chemical potentials are zero at very high energy in $pp$ collisions, which confirms that the partonic interactions possibly play an important role at RHIC and LHC, especially at LHC.
|
1809.10143
|
Jonathan Kozaczuk
|
Jordy de Vries, Patrick Draper, Kaori Fuyuto, Jonathan Kozaczuk, Dave
Sutherland
|
Indirect Signs of the Peccei-Quinn Mechanism
|
27 pages, 3 figures. Comments welcome!
|
Phys. Rev. D 99, 015042 (2019)
|
10.1103/PhysRevD.99.015042
|
ACFI-T18-16
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the Standard Model, the renormalization of the QCD vacuum angle $\theta$
is extremely tiny, and small $\theta$ is technically natural. In the general
Standard Model effective field theory (SMEFT), however, $\Delta\theta$ is
quadratically divergent, reflecting the fact that new sources of hadronic
CP-violation typically produce $\mathcal O(1)$ threshold corrections to
$\theta$. The observation of such CP-violating interactions would therefore be
in tension with solutions to the strong CP problem in which $\theta=0$ is an
ultraviolet boundary condition, pointing to the Peccei-Quinn mechanism as the
explanation for why $\theta$ is small in the infrared. We study the quadratic
divergences in $\theta$ arising from dimension-6 SMEFT operators and discuss
the discovery prospects for these operators at electric dipole moment
experiments, the LHC, and future proton-proton colliders.
|
[
{
"created": "Wed, 26 Sep 2018 18:00:00 GMT",
"version": "v1"
}
] |
2019-02-06
|
[
[
"de Vries",
"Jordy",
""
],
[
"Draper",
"Patrick",
""
],
[
"Fuyuto",
"Kaori",
""
],
[
"Kozaczuk",
"Jonathan",
""
],
[
"Sutherland",
"Dave",
""
]
] |
In the Standard Model, the renormalization of the QCD vacuum angle $\theta$ is extremely tiny, and small $\theta$ is technically natural. In the general Standard Model effective field theory (SMEFT), however, $\Delta\theta$ is quadratically divergent, reflecting the fact that new sources of hadronic CP-violation typically produce $\mathcal O(1)$ threshold corrections to $\theta$. The observation of such CP-violating interactions would therefore be in tension with solutions to the strong CP problem in which $\theta=0$ is an ultraviolet boundary condition, pointing to the Peccei-Quinn mechanism as the explanation for why $\theta$ is small in the infrared. We study the quadratic divergences in $\theta$ arising from dimension-6 SMEFT operators and discuss the discovery prospects for these operators at electric dipole moment experiments, the LHC, and future proton-proton colliders.
|
1905.09836
|
Gonzalo Alonso-\'Alvarez
|
Gonzalo Alonso \'Alvarez, Joerg Jaeckel, Thomas Hugle
|
Misalignment & Co.: (Pseudo-)scalar and vector dark matter with
curvature couplings
|
25 pages, 8 figures. References updated and discussion of vector
longitudinal modes expanded
| null |
10.1088/1475-7516/2020/02/014
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by their potential role as dark matter, we study the cosmological
evolution of light scalar and vector fields non-minimally coupled to gravity.
Our focus is on a situation where the dominant contribution to the energy
density arises from the misalignment mechanism. In addition, we also discuss
the possibility that dark matter is generated in a stochastic scenario or from
inflationary fluctuations. Even small deviations in the non-minimal couplings
from the standard scenarios lead to significant qualitative and quantitative
changes. This is due to the curvature-coupling driven superhorizon evolution of
the homogeneous field and the non-zero momentum modes during inflation. Both
the relic density yield and the large-scale density fluctuations are affected.
For the misalignment mechanism, this results in a weakening of the isocurvature
constraints and opens up new viable regions of parameter space.
|
[
{
"created": "Thu, 23 May 2019 18:00:03 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Feb 2020 15:41:28 GMT",
"version": "v2"
}
] |
2020-03-04
|
[
[
"Álvarez",
"Gonzalo Alonso",
""
],
[
"Jaeckel",
"Joerg",
""
],
[
"Hugle",
"Thomas",
""
]
] |
Motivated by their potential role as dark matter, we study the cosmological evolution of light scalar and vector fields non-minimally coupled to gravity. Our focus is on a situation where the dominant contribution to the energy density arises from the misalignment mechanism. In addition, we also discuss the possibility that dark matter is generated in a stochastic scenario or from inflationary fluctuations. Even small deviations in the non-minimal couplings from the standard scenarios lead to significant qualitative and quantitative changes. This is due to the curvature-coupling driven superhorizon evolution of the homogeneous field and the non-zero momentum modes during inflation. Both the relic density yield and the large-scale density fluctuations are affected. For the misalignment mechanism, this results in a weakening of the isocurvature constraints and opens up new viable regions of parameter space.
|
1209.2558
|
Go Mishima
|
Motoi Endo, Koichi Hamaguchi, Go Mishima
|
Constraints on Hidden Photon Models from Electron g-2 and Hydrogen
Spectroscopy
|
18 pages, 2 figures, 1 table. v2: minor corrections
|
Physical Review D 86, 095029 (2012)
|
10.1103/PhysRevD.86.095029
|
UT-12-31; IPMU12-172
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The hidden photon model is one of the simplest models which can explain the
anomaly of the muon anomalous magnetic moment (g-2). The experimental
constraints are studied in detail, which come from the electron g-2 and the
hydrogen transition frequencies. The input parameters are set carefully in
order to take dark photon contributions into account and to prevent the
analysis from being self-inconsistent. It is shown that the new analysis
provides a constraint severer by more than one order of magnitude than the
previous result.
|
[
{
"created": "Wed, 12 Sep 2012 10:57:35 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Nov 2012 01:48:13 GMT",
"version": "v2"
}
] |
2012-11-29
|
[
[
"Endo",
"Motoi",
""
],
[
"Hamaguchi",
"Koichi",
""
],
[
"Mishima",
"Go",
""
]
] |
The hidden photon model is one of the simplest models which can explain the anomaly of the muon anomalous magnetic moment (g-2). The experimental constraints are studied in detail, which come from the electron g-2 and the hydrogen transition frequencies. The input parameters are set carefully in order to take dark photon contributions into account and to prevent the analysis from being self-inconsistent. It is shown that the new analysis provides a constraint severer by more than one order of magnitude than the previous result.
|
2307.05187
|
Malte Algren
|
Malte Algren, John Andrew Raine and Tobias Golling
|
Decorrelation using Optimal Transport
| null | null |
10.1140/epjc/s10052-024-12868-6
| null |
hep-ph cs.LG hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
Being able to decorrelate a feature space from protected attributes is an
area of active research and study in ethics, fairness, and also natural
sciences. We introduce a novel decorrelation method using Convex Neural Optimal
Transport Solvers (Cnots) that is able to decorrelate a continuous feature
space against protected attributes with optimal transport. We demonstrate how
well it performs in the context of jet classification in high energy physics,
where classifier scores are desired to be decorrelated from the mass of a jet.
The decorrelation achieved in binary classification approaches the levels
achieved by the state-of-the-art using conditional normalising flows. When
moving to multiclass outputs the optimal transport approach performs
significantly better than the state-of-the-art, suggesting substantial gains at
decorrelating multidimensional feature spaces.
|
[
{
"created": "Tue, 11 Jul 2023 11:49:55 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jul 2023 07:24:54 GMT",
"version": "v2"
}
] |
2024-06-10
|
[
[
"Algren",
"Malte",
""
],
[
"Raine",
"John Andrew",
""
],
[
"Golling",
"Tobias",
""
]
] |
Being able to decorrelate a feature space from protected attributes is an area of active research and study in ethics, fairness, and also natural sciences. We introduce a novel decorrelation method using Convex Neural Optimal Transport Solvers (Cnots) that is able to decorrelate a continuous feature space against protected attributes with optimal transport. We demonstrate how well it performs in the context of jet classification in high energy physics, where classifier scores are desired to be decorrelated from the mass of a jet. The decorrelation achieved in binary classification approaches the levels achieved by the state-of-the-art using conditional normalising flows. When moving to multiclass outputs the optimal transport approach performs significantly better than the state-of-the-art, suggesting substantial gains at decorrelating multidimensional feature spaces.
|
1108.4360
|
Pomita Ghoshal
|
Raj Gandhi, Pomita Ghoshal
|
Atmospheric neutrinos as a probe of eV^2-scale active-sterile
oscillations
|
9 pages, 7 figures. Major revisions, analysis of Liquid Argon
detector added. Version to appear in Physical Review D (Brief Reports)
| null |
10.1103/PhysRevD.86.037301
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The down-going atmospheric \nu_{\mu} and {\bar{\nu_{\mu}}} fluxes can be
significantly altered due to the presence of eV^2-scale active-sterile
oscillations. We study the sensitivity of a large Liquid Argon detector and a
large magnetized iron detector (like the proposed ICAL at INO) to these
oscillations. Such oscillations are indicated by results from LSND, and more
recently, from MiniBooNE and from reanalyses of reactor experiments following
recent recalculations of reactor fluxes. There are other tentative indications
of the presence of sterile states in both the \nu and {\bar{\nu}} sectors as
well. Using the allowed sterile parameter ranges in a 3+1 mixing framework in
order to test these results, we perform a fit assuming active-sterile
oscillations in both the muon neutrino and antineutrino sectors, and compute
oscillation exclusion limits using atmospheric down-going muon neutrino and
anti-neutrino events. We find that (for both \nu_{\mu} and {\bar{\nu_{\mu}}}) a
Liquid Argon detector, an ICAL-like detector or a combined analysis of both
detectors with an exposure of 1 Mt yr provides significant sensitivity to
regions of parameter space in the range 0.1 < \Delta m^2 < 5 eV^2 for \sin^2
2\Theta_{\mu\mu}\geq 0.08. Thus atmospheric neutrino experiments can provide
complementary coverage in these regions, improving sensitivity limits in
combination with bounds from other experiments on these parameters. We also
analyse the bounds using muon antineutrino events only and compare them with
the results from MiniBooNE.
|
[
{
"created": "Mon, 22 Aug 2011 15:55:02 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Jul 2012 12:57:03 GMT",
"version": "v2"
}
] |
2013-05-30
|
[
[
"Gandhi",
"Raj",
""
],
[
"Ghoshal",
"Pomita",
""
]
] |
The down-going atmospheric \nu_{\mu} and {\bar{\nu_{\mu}}} fluxes can be significantly altered due to the presence of eV^2-scale active-sterile oscillations. We study the sensitivity of a large Liquid Argon detector and a large magnetized iron detector (like the proposed ICAL at INO) to these oscillations. Such oscillations are indicated by results from LSND, and more recently, from MiniBooNE and from reanalyses of reactor experiments following recent recalculations of reactor fluxes. There are other tentative indications of the presence of sterile states in both the \nu and {\bar{\nu}} sectors as well. Using the allowed sterile parameter ranges in a 3+1 mixing framework in order to test these results, we perform a fit assuming active-sterile oscillations in both the muon neutrino and antineutrino sectors, and compute oscillation exclusion limits using atmospheric down-going muon neutrino and anti-neutrino events. We find that (for both \nu_{\mu} and {\bar{\nu_{\mu}}}) a Liquid Argon detector, an ICAL-like detector or a combined analysis of both detectors with an exposure of 1 Mt yr provides significant sensitivity to regions of parameter space in the range 0.1 < \Delta m^2 < 5 eV^2 for \sin^2 2\Theta_{\mu\mu}\geq 0.08. Thus atmospheric neutrino experiments can provide complementary coverage in these regions, improving sensitivity limits in combination with bounds from other experiments on these parameters. We also analyse the bounds using muon antineutrino events only and compare them with the results from MiniBooNE.
|
2203.13416
|
Liang Zheng
|
Pengyao Cui, Zhongbao Yin, Liang Zheng
|
Strange particle production in jets and underlying events in pp
collisions at $\sqrt{s}~=~7$ TeV with PYTHIA8 generator
|
11 pages, 9 figures
|
Eur. Phys. J. A (2022) 58:53
|
10.1140/epja/s10050-022-00709-7
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Strange hadron production in pp collisions at $\sqrt{s}~=~7$ TeV is studied
in jets and underlying events using the PYTHIA8 event generator. Matching
strange hadrons to the jet area and the underlying event area is expected to
help us disentangle the strange particles produced in hard and soft processes.
The yield and the relative production of strange hadrons dependent on the event
multiplicity are investigated with the color reconnection and color rope
mechanisms implemented in the PYTHIA8 framework. It is found that the inclusive
strange hadron productions can be reasonably described by the color
reconnection and color rope combined effects. A significant multiplicity
dependent enhancement of the strange baryon production in the jet area is
observed induced by the modified string fragmentation mechanisms, indicating
the strange baryon enhancement persists in both the hard and the soft process.
Multi-strange baryons are found to be more collimated with the jet axis than
other strange hadrons in the string fragmentation picture with the jet shape
analysis technique. Future experimental examination of these jet related
strange hadron productions will provide more insight to the origin of
strangeness enhancement in small systems.
|
[
{
"created": "Fri, 25 Mar 2022 02:06:37 GMT",
"version": "v1"
}
] |
2022-03-28
|
[
[
"Cui",
"Pengyao",
""
],
[
"Yin",
"Zhongbao",
""
],
[
"Zheng",
"Liang",
""
]
] |
Strange hadron production in pp collisions at $\sqrt{s}~=~7$ TeV is studied in jets and underlying events using the PYTHIA8 event generator. Matching strange hadrons to the jet area and the underlying event area is expected to help us disentangle the strange particles produced in hard and soft processes. The yield and the relative production of strange hadrons dependent on the event multiplicity are investigated with the color reconnection and color rope mechanisms implemented in the PYTHIA8 framework. It is found that the inclusive strange hadron productions can be reasonably described by the color reconnection and color rope combined effects. A significant multiplicity dependent enhancement of the strange baryon production in the jet area is observed induced by the modified string fragmentation mechanisms, indicating the strange baryon enhancement persists in both the hard and the soft process. Multi-strange baryons are found to be more collimated with the jet axis than other strange hadrons in the string fragmentation picture with the jet shape analysis technique. Future experimental examination of these jet related strange hadron productions will provide more insight to the origin of strangeness enhancement in small systems.
|
1411.1450
|
Marcin Badziak
|
Marcin Badziak, Zygmunt Lalak, Marek Lewicki, Marek Olechowski, Stefan
Pokorski
|
Upper bounds on sparticle masses from muon g-2 and the Higgs mass and
the complementarity of future colliders
|
14 pages, 4 figures; v2: fig.2, comments and references added,
matches published version
|
JHEP 03 (2015) 003
|
10.1007/JHEP03(2015)003
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Supersymmetric (SUSY) explanation of the discrepancy between the measurement
of $(g-2)_\mu$ and its SM prediction puts strong upper bounds on the chargino
and smuon masses. At the same time, lower experimental limits on the chargino
and smuon masses, combined with the Higgs mass measurement, lead to an upper
bound on the stop masses. The current LHC limits on the chargino and smuon
masses (for not too compressed spectrum) set the upper bound on the stop masses
of about 10 TeV. The discovery potential of the future lepton and hadron
colliders should lead to the discovery of SUSY if it is responsible for the
explanation of the $(g-2)_\mu$ anomaly. This conclusion follows from the fact
that the upper bound on the stop masses decreases with the increase of the
lower experimental limit on the chargino and smuon masses.
|
[
{
"created": "Wed, 5 Nov 2014 23:38:35 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Mar 2015 14:39:15 GMT",
"version": "v2"
}
] |
2015-03-18
|
[
[
"Badziak",
"Marcin",
""
],
[
"Lalak",
"Zygmunt",
""
],
[
"Lewicki",
"Marek",
""
],
[
"Olechowski",
"Marek",
""
],
[
"Pokorski",
"Stefan",
""
]
] |
Supersymmetric (SUSY) explanation of the discrepancy between the measurement of $(g-2)_\mu$ and its SM prediction puts strong upper bounds on the chargino and smuon masses. At the same time, lower experimental limits on the chargino and smuon masses, combined with the Higgs mass measurement, lead to an upper bound on the stop masses. The current LHC limits on the chargino and smuon masses (for not too compressed spectrum) set the upper bound on the stop masses of about 10 TeV. The discovery potential of the future lepton and hadron colliders should lead to the discovery of SUSY if it is responsible for the explanation of the $(g-2)_\mu$ anomaly. This conclusion follows from the fact that the upper bound on the stop masses decreases with the increase of the lower experimental limit on the chargino and smuon masses.
|
2208.14802
|
Ulf-G. Mei{\ss}ner
|
Yong-Hui Lin, Hans-Werner Hammer, Ulf-G. Mei{\ss}ner
|
Dispersion-theoretical analysis of the electromagnetic form factors of
the $\Lambda$ hyperon
|
7 pages, 1 figure
| null |
10.1140/epjc/s10052-022-11056-8
| null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The electromagnetic form factors of the $\Lambda$ hyperon in the time-like
region are determined precisely through a dispersion-theoretical analysis of
the world data for the cross section of the annihilation process $e^+e^-\to
\bar{\Lambda}{\Lambda}$. The spectral function is represented by a
superposition of narrow and broad vector meson poles. We test different
scenarios for the spectral function and obtain a good description of the world
data in the time-like region. The uncertainties in the extracted form factors
are estimated by means of the bootstrap sampling method. The analytical
continuation of the form factors to the space-like region introduces large
errors due to the lack of data. When the electric $\Lambda$ radius from chiral
perturbation theory is taken as a constraint, the magnetic radius is predicted
as $r_M = 0.681 \pm 0.002$ fm. We also extract various vector meson to baryon
coupling constants.
|
[
{
"created": "Wed, 31 Aug 2022 12:30:34 GMT",
"version": "v1"
}
] |
2022-12-21
|
[
[
"Lin",
"Yong-Hui",
""
],
[
"Hammer",
"Hans-Werner",
""
],
[
"Meißner",
"Ulf-G.",
""
]
] |
The electromagnetic form factors of the $\Lambda$ hyperon in the time-like region are determined precisely through a dispersion-theoretical analysis of the world data for the cross section of the annihilation process $e^+e^-\to \bar{\Lambda}{\Lambda}$. The spectral function is represented by a superposition of narrow and broad vector meson poles. We test different scenarios for the spectral function and obtain a good description of the world data in the time-like region. The uncertainties in the extracted form factors are estimated by means of the bootstrap sampling method. The analytical continuation of the form factors to the space-like region introduces large errors due to the lack of data. When the electric $\Lambda$ radius from chiral perturbation theory is taken as a constraint, the magnetic radius is predicted as $r_M = 0.681 \pm 0.002$ fm. We also extract various vector meson to baryon coupling constants.
|
hep-ph/9903482
|
Jisuke Kubo
|
Jisuke Kubo
|
Applications of the Reduction of Couplings
|
26 pages, 4 figures
|
Lect.Notes Phys. 558 (2000) 106-126
| null |
KANAZAWA-99-02
|
hep-ph
| null |
Applications of the principle of reduction of couplings to the standard model
and supersymmetric grand unified theories are reviewed. Phenomenological
applications of renormalization group invariant sum rules for soft
supersymmetry-breaking parameters are also reviewed.
|
[
{
"created": "Thu, 25 Mar 1999 05:44:32 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kubo",
"Jisuke",
""
]
] |
Applications of the principle of reduction of couplings to the standard model and supersymmetric grand unified theories are reviewed. Phenomenological applications of renormalization group invariant sum rules for soft supersymmetry-breaking parameters are also reviewed.
|
2001.09349
|
Atri Dey
|
Atri Dey and Jayita Lahiri and Biswarup Mukhopadhyaya
|
LHC signals of triplet scalars as dark matter portal: cut-based approach
and improvement with gradient boosting and neural networks
|
35 pages, 33 figures
| null |
10.1007/JHEP06(2020)126
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a scenario where an SU(2) triplet scalar acts as the portal for a
scalar dark matter particle. We identify regions of the parameter space, where
such a triplet coexists with the usual Higgs doublet consistently with all
theoretical as well as neutrino, accelerator and dark matter constraints, and
the triplet-dominated neutral state has substantial invisible branching
fraction. LHC signals are investigated for such regions, in the final state
{\em same-sign dilepton + $\ge$ 2 jets + $\not E_T$.} While straightforward
detectability at the high-luminosity run is predicted for some benchmark points
in a cut-based analysis, there are other benchmarks where one has to resort to
gradient boosting/neural network techniques in order to achieve appreciable
signal significance.
|
[
{
"created": "Sat, 25 Jan 2020 19:01:16 GMT",
"version": "v1"
}
] |
2020-07-15
|
[
[
"Dey",
"Atri",
""
],
[
"Lahiri",
"Jayita",
""
],
[
"Mukhopadhyaya",
"Biswarup",
""
]
] |
We consider a scenario where an SU(2) triplet scalar acts as the portal for a scalar dark matter particle. We identify regions of the parameter space, where such a triplet coexists with the usual Higgs doublet consistently with all theoretical as well as neutrino, accelerator and dark matter constraints, and the triplet-dominated neutral state has substantial invisible branching fraction. LHC signals are investigated for such regions, in the final state {\em same-sign dilepton + $\ge$ 2 jets + $\not E_T$.} While straightforward detectability at the high-luminosity run is predicted for some benchmark points in a cut-based analysis, there are other benchmarks where one has to resort to gradient boosting/neural network techniques in order to achieve appreciable signal significance.
|
1410.4447
|
Ning Chen
|
Ning Chen, Jinmian Li, Yandong Liu, Zuowei Liu
|
LHC searches for the CP-odd Higgs by the jet substructure analysis
|
26 pages, 12 figures, submitted to Phys. Rev. D
|
Phys.Rev. D91 (2015) 075002
|
10.1103/PhysRevD.91.075002
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The LHC searches for the CP-odd Higgs boson is studied (with masses from 300
GeV to 1 TeV) in the context of the general two-Higgs-doublet model. With the
discovery of the 125 GeV Higgs boson at the LHC, we highlight one promising
discovery channel of the hZ. This channel can become significant after the
global signal fitting to the 125 GeV Higgs boson in the general
two-Higgs-doublet model. It is particularly important in the scenario where two
CP-even Higgs bosons in the two-Higgs-doublet model have the common mass of 125
GeV. Since the final states involve a Standard-Model-like Higgs boson, we apply
the jet substructure analysis of the fat Higgs jet in order to eliminate the
Standard Model background sufficiently. After performing the kinematic cuts, we
present the LHC search sensitivities for the CP-odd Higgs boson with mass up to
1 TeV via this channel.
|
[
{
"created": "Thu, 16 Oct 2014 14:34:36 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Oct 2014 11:44:52 GMT",
"version": "v2"
}
] |
2015-05-05
|
[
[
"Chen",
"Ning",
""
],
[
"Li",
"Jinmian",
""
],
[
"Liu",
"Yandong",
""
],
[
"Liu",
"Zuowei",
""
]
] |
The LHC searches for the CP-odd Higgs boson is studied (with masses from 300 GeV to 1 TeV) in the context of the general two-Higgs-doublet model. With the discovery of the 125 GeV Higgs boson at the LHC, we highlight one promising discovery channel of the hZ. This channel can become significant after the global signal fitting to the 125 GeV Higgs boson in the general two-Higgs-doublet model. It is particularly important in the scenario where two CP-even Higgs bosons in the two-Higgs-doublet model have the common mass of 125 GeV. Since the final states involve a Standard-Model-like Higgs boson, we apply the jet substructure analysis of the fat Higgs jet in order to eliminate the Standard Model background sufficiently. After performing the kinematic cuts, we present the LHC search sensitivities for the CP-odd Higgs boson with mass up to 1 TeV via this channel.
|
hep-ph/0605324
|
Athanasios Kapoyannis
|
A. S. Kapoyannis
|
Application of the Gibbs equilibrium conditions to the QGP-Hadron
transition curve
|
23 pages, 5 figures
| null |
10.1140/epjc/s10052-007-0374-8
| null |
hep-ph
| null |
A method is developed to consistently satisfy the Gibbs equilibrium
conditions between the quark-gluon and hadronic phase, although each phase has
been formulated in separate grand canonical partition functions containing
three quark flavours. The sector in the space of thermodynamic variables, where
the transition takes place, is restricted to a curve, according to the phase
diagram of QCD. The conservation laws of quantum numbers are also imposed on
the transition curve. The effect of the inclusion of the newly discovered
pentaquark states is considered. The freeze-out conditions of S+S, S+Ag (SPS)
and Au+Au (RHIC) are found compatible with a primordial QGP phase, but the
conditions indicated by Pb+Pb (SPS) are not.
|
[
{
"created": "Mon, 29 May 2006 21:46:04 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Kapoyannis",
"A. S.",
""
]
] |
A method is developed to consistently satisfy the Gibbs equilibrium conditions between the quark-gluon and hadronic phase, although each phase has been formulated in separate grand canonical partition functions containing three quark flavours. The sector in the space of thermodynamic variables, where the transition takes place, is restricted to a curve, according to the phase diagram of QCD. The conservation laws of quantum numbers are also imposed on the transition curve. The effect of the inclusion of the newly discovered pentaquark states is considered. The freeze-out conditions of S+S, S+Ag (SPS) and Au+Au (RHIC) are found compatible with a primordial QGP phase, but the conditions indicated by Pb+Pb (SPS) are not.
|
2005.13541
|
Salvador Centelles Chuli\'a
|
Salvador Centelles Chuli\'a, Christian D\"oring, Werner Rodejohann and
Ulises J. Salda\~na-Salazar
|
Natural axion model from flavour
|
21 pages, 4 figures, 1 table. Typo corrected and updated reference
list in v2
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We explore a common symmetrical origin for two long standing problems in
particle physics: the strong CP and the fermion mass hierarchy problems. The
Peccei--Quinn mechanism solves the former one with an anomalous global
$U(1)_{\rm PQ}$ symmetry. Here we investigate how this $U(1)_{\rm PQ}$ could at
the same time explain the fermion mass hierarchy. We work in the context of a
four-Higgs-doublet model which explains all quark and charged fermion masses
with natural, i.e.\ order $1$, Yukawa couplings. Moreover, the axion of the
model constitutes a viable dark matter candidate and neutrino masses are
incorporated via the standard type-I seesaw mechanism. A simple extension of
the model allows for Dirac neutrinos.
|
[
{
"created": "Wed, 27 May 2020 18:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Jun 2020 13:50:28 GMT",
"version": "v2"
}
] |
2020-06-02
|
[
[
"Chuliá",
"Salvador Centelles",
""
],
[
"Döring",
"Christian",
""
],
[
"Rodejohann",
"Werner",
""
],
[
"Saldaña-Salazar",
"Ulises J.",
""
]
] |
We explore a common symmetrical origin for two long standing problems in particle physics: the strong CP and the fermion mass hierarchy problems. The Peccei--Quinn mechanism solves the former one with an anomalous global $U(1)_{\rm PQ}$ symmetry. Here we investigate how this $U(1)_{\rm PQ}$ could at the same time explain the fermion mass hierarchy. We work in the context of a four-Higgs-doublet model which explains all quark and charged fermion masses with natural, i.e.\ order $1$, Yukawa couplings. Moreover, the axion of the model constitutes a viable dark matter candidate and neutrino masses are incorporated via the standard type-I seesaw mechanism. A simple extension of the model allows for Dirac neutrinos.
|
1509.01729
|
Naoya Kitajima
|
Naoya Kitajima, Fuminobu Takahashi
|
Disappearing Inflaton Potential via Heavy Field Dynamics
|
6 pages, 1 figure
| null |
10.1088/1475-7516/2016/02/041
|
TU-1005, IPMU15-0144
|
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a possibility that the inflaton potential is significantly
modified after inflation due to heavy field dynamics. During inflation there
may be a heavy scalar field stabilized at a value deviated from the low-energy
minimum. As the heavy field moves to the low-energy minimum, the inflaton
potential could be significantly modified. In extreme cases, the inflaton
potential vanishes and the inflaton becomes almost massless at some time after
inflation. Such transition of the inflaton potential has interesting
implications for primordial density perturbations, reheating, creation of
unwanted relics, dark radiation, and experimental search for light degrees of
freedom. To be concrete, we consider a chaotic inflation in supergravity where
the inflaton mass parameter is promoted to a modulus field, finding that the
inflaton becomes stable after the transition and contributes to dark matter.
Another example is the new inflation by the MSSM Higgs field which acquires a
large expectation value just after inflation, but it returns to the origin
after the transition and settles down at the electroweak vacuum. Interestingly,
the smallness of the electroweak scale compared to the Planck scale is directly
related to the flatness of the inflaton potential.
|
[
{
"created": "Sat, 5 Sep 2015 19:14:48 GMT",
"version": "v1"
}
] |
2016-02-24
|
[
[
"Kitajima",
"Naoya",
""
],
[
"Takahashi",
"Fuminobu",
""
]
] |
We propose a possibility that the inflaton potential is significantly modified after inflation due to heavy field dynamics. During inflation there may be a heavy scalar field stabilized at a value deviated from the low-energy minimum. As the heavy field moves to the low-energy minimum, the inflaton potential could be significantly modified. In extreme cases, the inflaton potential vanishes and the inflaton becomes almost massless at some time after inflation. Such transition of the inflaton potential has interesting implications for primordial density perturbations, reheating, creation of unwanted relics, dark radiation, and experimental search for light degrees of freedom. To be concrete, we consider a chaotic inflation in supergravity where the inflaton mass parameter is promoted to a modulus field, finding that the inflaton becomes stable after the transition and contributes to dark matter. Another example is the new inflation by the MSSM Higgs field which acquires a large expectation value just after inflation, but it returns to the origin after the transition and settles down at the electroweak vacuum. Interestingly, the smallness of the electroweak scale compared to the Planck scale is directly related to the flatness of the inflaton potential.
|
1811.07912
|
Guanying Zhu
|
Guanying Zhu (Ohio State), Shirley Weishi Li (Ohio State & SLAC), John
F. Beacom (Ohio State)
|
Developing the MeV potential of DUNE: Detailed considerations of
muon-induced spallation and other backgrounds
|
22 pages, 13 figures, 4 tables; Version accepted for PRC, with
various improvements (clarifications, updated references, new figures) but no
changes in main results; Attached a file with the spallation background rates
both pre- and post-cuts
|
Phys. Rev. C 99, 055810 (2019)
|
10.1103/PhysRevC.99.055810
|
SLAC-PUB-17355
|
hep-ph astro-ph.HE nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Deep Underground Neutrino Experiment (DUNE) could be revolutionary for
MeV neutrino astrophysics, because of its huge detector volume, unique event
reconstruction capabilities, and excellent sensitivity to the $\nu_e$ flavor.
However, its backgrounds are not yet known. A major background is expected due
to muon spallation of argon, which produces unstable isotopes that later beta
decay. We present the first comprehensive study of MeV spallation backgrounds
in argon, detailing isotope production mechanisms and decay properties,
analyzing beta energy and time distributions, and proposing experimental cuts.
We show that above a nominal detection threshold of 5-MeV electron energy, the
most important backgrounds are --- surprisingly --- due to low-A isotopes, such
as Li, Be, and B, even though high-A isotopes near argon are abundantly
produced. We show that spallation backgrounds can be powerfully rejected by
simple cuts, with clear paths for improvements. We compare these background
rates to rates of possible MeV astrophysical neutrino signals in DUNE,
including solar neutrinos (detailed in a companion paper [Capozzi et al.
arXiv:1808.08232 [hep-ph]]), supernova burst neutrinos, and the diffuse
supernova neutrino background. Further, to aid trigger strategies, in the
Appendixes we quantify the rates of single and multiple MeV events due to
spallation, radiogenic neutron capture, and other backgrounds, including
through pileup. Our overall conclusion is that DUNE has high potential for MeV
neutrino astrophysics, but reaching this potential requires new experimental
initiatives.
|
[
{
"created": "Mon, 19 Nov 2018 19:00:05 GMT",
"version": "v1"
},
{
"created": "Fri, 17 May 2019 22:04:55 GMT",
"version": "v2"
}
] |
2019-05-29
|
[
[
"Zhu",
"Guanying",
"",
"Ohio State"
],
[
"Li",
"Shirley Weishi",
"",
"Ohio State & SLAC"
],
[
"Beacom",
"John F.",
"",
"Ohio State"
]
] |
The Deep Underground Neutrino Experiment (DUNE) could be revolutionary for MeV neutrino astrophysics, because of its huge detector volume, unique event reconstruction capabilities, and excellent sensitivity to the $\nu_e$ flavor. However, its backgrounds are not yet known. A major background is expected due to muon spallation of argon, which produces unstable isotopes that later beta decay. We present the first comprehensive study of MeV spallation backgrounds in argon, detailing isotope production mechanisms and decay properties, analyzing beta energy and time distributions, and proposing experimental cuts. We show that above a nominal detection threshold of 5-MeV electron energy, the most important backgrounds are --- surprisingly --- due to low-A isotopes, such as Li, Be, and B, even though high-A isotopes near argon are abundantly produced. We show that spallation backgrounds can be powerfully rejected by simple cuts, with clear paths for improvements. We compare these background rates to rates of possible MeV astrophysical neutrino signals in DUNE, including solar neutrinos (detailed in a companion paper [Capozzi et al. arXiv:1808.08232 [hep-ph]]), supernova burst neutrinos, and the diffuse supernova neutrino background. Further, to aid trigger strategies, in the Appendixes we quantify the rates of single and multiple MeV events due to spallation, radiogenic neutron capture, and other backgrounds, including through pileup. Our overall conclusion is that DUNE has high potential for MeV neutrino astrophysics, but reaching this potential requires new experimental initiatives.
|
2109.05831
|
Muhammad Waqas
|
Muhammad Waqas, H. M. Chen, Guang Xiong Pen, Abd Al Karim Haj Ismail,
Muhammad Ajaz, Zafar Wazir, Ramoona Shehzadi, Sabiha Jamal, Atef AbdelKader
|
Study of kinetic freeze-out parameters as function of rapidity in pp
collisions at CERN SPS energies
| null |
entropy: 23, 1363, 2021
|
10.3390/e23101363
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We used the blast wave model with Boltzmann Gibbs statistics and analyzed the
experimental data measured by NA61/SHINE Collaboration in inelastic (INEL)
proton-proton collisions at different rapidity slices at different
center-of-mass energies. The particles used in this study are pion, kaon,
proton and anti-proton. We extracted kinetic freeze-out temperature, transverse
flow velocity and kinetic freeze-out volume from the transverse momentum
spectra of the particles. We observed that the kinetic freeze-out temperature
is rapidity and energy dependent, while transverse flow velocity does not
depend on them. Furthermore, we observed that the kinetic freeze-out volume is
energy dependent but it remains constant with changing the rapidity. We also
observed that all these three parameters are mass dependent. In addition, with
the increase of mass, the kinetic freeze-out temperature increases, and the
transverse flow velocity as well as kinetic freeze-out volume decreases.
|
[
{
"created": "Mon, 13 Sep 2021 10:00:49 GMT",
"version": "v1"
}
] |
2021-10-20
|
[
[
"Waqas",
"Muhammad",
""
],
[
"Chen",
"H. M.",
""
],
[
"Pen",
"Guang Xiong",
""
],
[
"Ismail",
"Abd Al Karim Haj",
""
],
[
"Ajaz",
"Muhammad",
""
],
[
"Wazir",
"Zafar",
""
],
[
"Shehzadi",
"Ramoona",
""
],
[
"Jamal",
"Sabiha",
""
],
[
"AbdelKader",
"Atef",
""
]
] |
We used the blast wave model with Boltzmann Gibbs statistics and analyzed the experimental data measured by NA61/SHINE Collaboration in inelastic (INEL) proton-proton collisions at different rapidity slices at different center-of-mass energies. The particles used in this study are pion, kaon, proton and anti-proton. We extracted kinetic freeze-out temperature, transverse flow velocity and kinetic freeze-out volume from the transverse momentum spectra of the particles. We observed that the kinetic freeze-out temperature is rapidity and energy dependent, while transverse flow velocity does not depend on them. Furthermore, we observed that the kinetic freeze-out volume is energy dependent but it remains constant with changing the rapidity. We also observed that all these three parameters are mass dependent. In addition, with the increase of mass, the kinetic freeze-out temperature increases, and the transverse flow velocity as well as kinetic freeze-out volume decreases.
|
0909.5434
|
Eduardo Pont\'on
|
Marcela Carena, Kyoungchul Kong, Eduardo Ponton, Jose Zurita
|
Supersymmetric Higgs Bosons and Beyond
|
References added. Mistake in Eq. 14 corrected, conclusions unchanged.
Typos corrected. Version accepted for publication in PRD. 50 pages, 29
figures
|
Phys.Rev.D81:015001,2010
|
10.1103/PhysRevD.81.015001
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider supersymmetric models that include particles beyond the Minimal
Supersymmetric Standard Model (MSSM) with masses in the TeV range, and that
couple significantly to the MSSM Higgs sector. We perform a model-independent
analysis of the spectrum and couplings of the MSSM Higgs fields, based on an
effective theory of the MSSM degrees of freedom. The tree-level mass of the
lightest CP-even state can easily be above the LEP bound of 114 GeV, thus
allowing for a relatively light spectrum of superpartners, restricted only by
direct searches. The Higgs spectrum and couplings can be significantly modified
compared to the MSSM ones, often allowing for interesting new decay modes. We
also observe that the gluon fusion production cross section of the SM-like
Higgs can be enhanced with respect to both the Standard Model and the MSSM.
|
[
{
"created": "Tue, 29 Sep 2009 20:19:14 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Dec 2009 17:48:25 GMT",
"version": "v2"
}
] |
2010-01-15
|
[
[
"Carena",
"Marcela",
""
],
[
"Kong",
"Kyoungchul",
""
],
[
"Ponton",
"Eduardo",
""
],
[
"Zurita",
"Jose",
""
]
] |
We consider supersymmetric models that include particles beyond the Minimal Supersymmetric Standard Model (MSSM) with masses in the TeV range, and that couple significantly to the MSSM Higgs sector. We perform a model-independent analysis of the spectrum and couplings of the MSSM Higgs fields, based on an effective theory of the MSSM degrees of freedom. The tree-level mass of the lightest CP-even state can easily be above the LEP bound of 114 GeV, thus allowing for a relatively light spectrum of superpartners, restricted only by direct searches. The Higgs spectrum and couplings can be significantly modified compared to the MSSM ones, often allowing for interesting new decay modes. We also observe that the gluon fusion production cross section of the SM-like Higgs can be enhanced with respect to both the Standard Model and the MSSM.
|
1607.08313
|
Chun-Khiang Chua
|
Hai-Yang Cheng, Chun-Khiang Chua, Zhi-Qing Zhang
|
Direct CP Violation in Charmless Three-body Decays of $B$ Mesons
|
32 pages, 3 figures
|
Phys. Rev. D 94, 094015 (2016)
|
10.1103/PhysRevD.94.094015
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Direct CP violation in charmless three-body hadronic decays of $B$ mesons is
studied within the framework of a simple model based on the factorization
approach. Three-body decays of heavy mesons receive both resonant and
nonresonant contributions. Dominant nonresonant contributions to tree-dominated
and penguin-dominated three-body decays arise from the $b\to u$ tree transition
and $b\to s$ penguin transition, respectively. The former can be evaluated in
the framework of heavy meson chiral perturbation theory with some modification,
while the latter is governed by the matrix element of the scalar density
$\langle M_1M_2|\bar q_1 q_2|0\rangle$. Strong phases in this work reside in
effective Wilson coefficients, propagators of resonances and the matrix element
of scalar density. In order to accommodate the branching fraction and CP
asymmetries observed in $B^-\to K^-\pi^+\pi^-$, the matrix element $\langle
K\pi|\bar sq|0\rangle$ should have an additional strong phase, which might
arise from some sort of power corrections such as final-state interactions. We
calculate inclusive and regional CP asymmetries and find that nonresonant CP
violation is usually much larger than the resonant one and that the
interference effect is generally quite significant. If nonresonant
contributions are turned off in the $K^+K^-K^-$ mode, the predicted CP
asymmetries due to resonances will be wrong in sign when confronted with
experiment. In our study of $B^-\to \pi^-\pi^+\pi^-$, we find that ${\cal
A}_{C\!P}(\rho^0\pi^-)$ should be positive in order to account for CP
asymmetries observed in this decay. However, all theories predict a large and
negative CP violation in $B^-\to \rho^0\pi^-$. Measurements of CP-asymmetry
Dalitz distributions put very stringent constraints on the theoretical models.
We check the magnitude and the sign of violation in some (large) invariant mass
regions to test our model.
|
[
{
"created": "Thu, 28 Jul 2016 04:46:08 GMT",
"version": "v1"
}
] |
2016-11-23
|
[
[
"Cheng",
"Hai-Yang",
""
],
[
"Chua",
"Chun-Khiang",
""
],
[
"Zhang",
"Zhi-Qing",
""
]
] |
Direct CP violation in charmless three-body hadronic decays of $B$ mesons is studied within the framework of a simple model based on the factorization approach. Three-body decays of heavy mesons receive both resonant and nonresonant contributions. Dominant nonresonant contributions to tree-dominated and penguin-dominated three-body decays arise from the $b\to u$ tree transition and $b\to s$ penguin transition, respectively. The former can be evaluated in the framework of heavy meson chiral perturbation theory with some modification, while the latter is governed by the matrix element of the scalar density $\langle M_1M_2|\bar q_1 q_2|0\rangle$. Strong phases in this work reside in effective Wilson coefficients, propagators of resonances and the matrix element of scalar density. In order to accommodate the branching fraction and CP asymmetries observed in $B^-\to K^-\pi^+\pi^-$, the matrix element $\langle K\pi|\bar sq|0\rangle$ should have an additional strong phase, which might arise from some sort of power corrections such as final-state interactions. We calculate inclusive and regional CP asymmetries and find that nonresonant CP violation is usually much larger than the resonant one and that the interference effect is generally quite significant. If nonresonant contributions are turned off in the $K^+K^-K^-$ mode, the predicted CP asymmetries due to resonances will be wrong in sign when confronted with experiment. In our study of $B^-\to \pi^-\pi^+\pi^-$, we find that ${\cal A}_{C\!P}(\rho^0\pi^-)$ should be positive in order to account for CP asymmetries observed in this decay. However, all theories predict a large and negative CP violation in $B^-\to \rho^0\pi^-$. Measurements of CP-asymmetry Dalitz distributions put very stringent constraints on the theoretical models. We check the magnitude and the sign of violation in some (large) invariant mass regions to test our model.
|
1412.4253
|
Nirakar Sahoo
|
Sudhanwa Patra, Nirakar Sahoo, Narendra Sahu
|
Dipolar dark matter in light of 3.5 keV X-ray Line, Neutrino mass and
LUX data
| null | null | null | null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A simple extension of the standard model (SM) providing transient magnetic
moments to right-handed neutrinos is presented. In this model, the decay of
next-to-lightest right-handed heavy neutrino to the lightest one and a photon
(N 2 -> N 1 + gamma) can explain the 3.5 keV X-ray line signal observed by
XMM-Newton X-ray observatory. Beside the SM particles and heavy right-handed
Majorana neutrinos, the model contains a singly charged scalar (H) and an extra
Higgs doublet (Sigma). Within this minimal set of extra fields the sub-eV
masses of left-handed neutrinos are also explained. Moreover, we show that the
spin-independent DM-nucleon cross-section is compatible with latest LUX data.
|
[
{
"created": "Sat, 13 Dec 2014 16:36:37 GMT",
"version": "v1"
}
] |
2014-12-16
|
[
[
"Patra",
"Sudhanwa",
""
],
[
"Sahoo",
"Nirakar",
""
],
[
"Sahu",
"Narendra",
""
]
] |
A simple extension of the standard model (SM) providing transient magnetic moments to right-handed neutrinos is presented. In this model, the decay of next-to-lightest right-handed heavy neutrino to the lightest one and a photon (N 2 -> N 1 + gamma) can explain the 3.5 keV X-ray line signal observed by XMM-Newton X-ray observatory. Beside the SM particles and heavy right-handed Majorana neutrinos, the model contains a singly charged scalar (H) and an extra Higgs doublet (Sigma). Within this minimal set of extra fields the sub-eV masses of left-handed neutrinos are also explained. Moreover, we show that the spin-independent DM-nucleon cross-section is compatible with latest LUX data.
|
1507.02527
|
Masatoshi Yamada
|
Ken-Ichi Aoki, Hidenari Uoi, Masatoshi Yamada
|
Functional renormalization group study of the Nambu--Jona-Lasinio model
at finite temperature and density in an external magnetic field
|
6 pages, 6 figures, published version
|
Phys.Lett. B753 (2016) 580-585
|
10.1016/j.physletb.2015.12.063
|
KANAZAWA-15-12
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this study, we investigate the Nambu--Jona-Lasinio (NJL) model at finite
temperature and finite density in an external magnetic field using the
functional renormalization group. We investigate the dependence of the position
of the ultraviolet fixed point (UVFP) of the four-Fermi coupling constant on
the temperature, density, and external magnetic field, and we obtain the chiral
phase structure. The UVFP at low temperature and finite chemical potential
oscillates in a small external magnetic field, which can be interpreted as the
de Haas--van Alphen effect. We also obtain phase diagrams with complex
structures, where the phase boundary moves back and forth as the external
magnetic field increases in the low temperature and high density region.
|
[
{
"created": "Thu, 9 Jul 2015 14:31:19 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Jan 2016 05:46:15 GMT",
"version": "v2"
}
] |
2016-01-18
|
[
[
"Aoki",
"Ken-Ichi",
""
],
[
"Uoi",
"Hidenari",
""
],
[
"Yamada",
"Masatoshi",
""
]
] |
In this study, we investigate the Nambu--Jona-Lasinio (NJL) model at finite temperature and finite density in an external magnetic field using the functional renormalization group. We investigate the dependence of the position of the ultraviolet fixed point (UVFP) of the four-Fermi coupling constant on the temperature, density, and external magnetic field, and we obtain the chiral phase structure. The UVFP at low temperature and finite chemical potential oscillates in a small external magnetic field, which can be interpreted as the de Haas--van Alphen effect. We also obtain phase diagrams with complex structures, where the phase boundary moves back and forth as the external magnetic field increases in the low temperature and high density region.
|
2304.00035
|
Darcy Newmark
|
Darcy A. Newmark and Austin Schneider
|
Sensitivity to Supernovae Average $\nu_x$ Temperature with Neutral
Current Interactions in DUNE
|
9 pages, 13 figures
| null |
10.1103/PhysRevD.108.043005
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We explore a novel method for measuring the average temperature of the
$\nu_x$ component in Type-II core-collapse supernovae. By measuring neutral
current incoherent neutrino-Argon interactions in DUNE we can obtain spectral
information for the combination of all active neutrino species. Combining this
all-neutrino spectral information with detailed charged current measurements of
the electron neutrino and electron anti-neutrino fluxes from DUNE and
Hyper-Kamiokande, we can infer the average temperature for the remaining
neutrino species in the $\nu_x$ component to within a factor two for most cases
and to 30% for a small range of average $\nu_x$ temperatures. Due to the
limited energy range of the emitted photons from incoherent neutral current
interactions on Argon, the $\nu_x$ temperature reconstruction demonstrates a
degeneracy in the one and two sigma credible regions. Furthermore, while large
uncertainties on the NC cross-section penalize this measurement, we examined
the efficacy of constraining NC cross-section uncertainties on improving
$\nu_x$ measurements. We found that if additional measurements of
B(M1$\uparrow$) 1$^+$ excited state transitions in Argon are able to reduce
correlated cross section uncertainties from 15% to 7%, the size of the
$1\sigma$ allowed regions for $T_{\nu_x}$ becomes sample size limited, and
approaches the case where there are no uncertainties on the cross-section.
|
[
{
"created": "Fri, 31 Mar 2023 18:00:03 GMT",
"version": "v1"
}
] |
2023-08-16
|
[
[
"Newmark",
"Darcy A.",
""
],
[
"Schneider",
"Austin",
""
]
] |
We explore a novel method for measuring the average temperature of the $\nu_x$ component in Type-II core-collapse supernovae. By measuring neutral current incoherent neutrino-Argon interactions in DUNE we can obtain spectral information for the combination of all active neutrino species. Combining this all-neutrino spectral information with detailed charged current measurements of the electron neutrino and electron anti-neutrino fluxes from DUNE and Hyper-Kamiokande, we can infer the average temperature for the remaining neutrino species in the $\nu_x$ component to within a factor two for most cases and to 30% for a small range of average $\nu_x$ temperatures. Due to the limited energy range of the emitted photons from incoherent neutral current interactions on Argon, the $\nu_x$ temperature reconstruction demonstrates a degeneracy in the one and two sigma credible regions. Furthermore, while large uncertainties on the NC cross-section penalize this measurement, we examined the efficacy of constraining NC cross-section uncertainties on improving $\nu_x$ measurements. We found that if additional measurements of B(M1$\uparrow$) 1$^+$ excited state transitions in Argon are able to reduce correlated cross section uncertainties from 15% to 7%, the size of the $1\sigma$ allowed regions for $T_{\nu_x}$ becomes sample size limited, and approaches the case where there are no uncertainties on the cross-section.
|
2111.11849
|
Nicol\`o Masi
|
Nicolo' Masi
|
An Exceptional G(2) Extension of the Standard Model from the
Correspondence with Cayley-Dickson Algebras Automorphism Groups
| null |
Scientific Reports 11:22528 (2021), Nature Portfolio
|
10.1038/s41598-021-01814-1
| null |
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
In this article I propose a new criterion to extend the Standard Model of
particle physics from a straightforward algebraic conjecture: the symmetries of
physical microscopic forces originate from the automorphism groups of main
Cayley-Dickson algebras, from complex numbers to octonions and sedenions. This
correspondence leads to a natural enlargement of the Standard Model color
sector, from a SU(3) gauge group to an exceptional Higgs-broken G(2) group,
following the octonionic automorphism relation guideline. In this picture, an
additional ensemble of massive G(2)-gluons emerges, which is separated from the
particle dynamics of the Standard Model.
|
[
{
"created": "Fri, 19 Nov 2021 19:04:30 GMT",
"version": "v1"
}
] |
2021-11-24
|
[
[
"Masi",
"Nicolo'",
""
]
] |
In this article I propose a new criterion to extend the Standard Model of particle physics from a straightforward algebraic conjecture: the symmetries of physical microscopic forces originate from the automorphism groups of main Cayley-Dickson algebras, from complex numbers to octonions and sedenions. This correspondence leads to a natural enlargement of the Standard Model color sector, from a SU(3) gauge group to an exceptional Higgs-broken G(2) group, following the octonionic automorphism relation guideline. In this picture, an additional ensemble of massive G(2)-gluons emerges, which is separated from the particle dynamics of the Standard Model.
|
2210.14924
|
Manuel Sommerhalder
|
Anna Hallin, Gregor Kasieczka, Tobias Quadfasel, David Shih, Manuel
Sommerhalder
|
Resonant anomaly detection without background sculpting
|
11 pages, 8 figures; v2 (published version): referencing code and
minor style updates
|
Phys. Rev. D 107, 114012 (2023)
|
10.1103/PhysRevD.107.114012
| null |
hep-ph hep-ex physics.data-an
|
http://creativecommons.org/licenses/by/4.0/
|
We introduce a new technique named Latent CATHODE (LaCATHODE) for performing
"enhanced bump hunts", a type of resonant anomaly search that combines
conventional one-dimensional bump hunts with a model-agnostic anomaly score in
an auxiliary feature space where potential signals could also be localized. The
main advantage of LaCATHODE over existing methods is that it provides an
anomaly score that is well behaved when evaluating it beyond the signal region,
which is essential to prevent the sculpting of background distributions in the
bump hunt. LaCATHODE accomplishes this by constructing the anomaly score
directly in the latent space learned by a conditional normalizing flow trained
on sideband regions. We demonstrate the superior stability and comparable
performance of LaCATHODE for enhanced bump hunting in an illustrative toy
example as well as on the LHC Olympics R&D dataset.
|
[
{
"created": "Wed, 26 Oct 2022 18:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jul 2023 13:19:28 GMT",
"version": "v2"
}
] |
2023-07-11
|
[
[
"Hallin",
"Anna",
""
],
[
"Kasieczka",
"Gregor",
""
],
[
"Quadfasel",
"Tobias",
""
],
[
"Shih",
"David",
""
],
[
"Sommerhalder",
"Manuel",
""
]
] |
We introduce a new technique named Latent CATHODE (LaCATHODE) for performing "enhanced bump hunts", a type of resonant anomaly search that combines conventional one-dimensional bump hunts with a model-agnostic anomaly score in an auxiliary feature space where potential signals could also be localized. The main advantage of LaCATHODE over existing methods is that it provides an anomaly score that is well behaved when evaluating it beyond the signal region, which is essential to prevent the sculpting of background distributions in the bump hunt. LaCATHODE accomplishes this by constructing the anomaly score directly in the latent space learned by a conditional normalizing flow trained on sideband regions. We demonstrate the superior stability and comparable performance of LaCATHODE for enhanced bump hunting in an illustrative toy example as well as on the LHC Olympics R&D dataset.
|
1801.09643
|
Stephen Parke
|
Stephen Parke
|
Theoretical Aspects of the Quantum Neutrino
|
13 pages, 12 figures, Proceedings for Lepton-Photon 2017
| null | null | null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
In this summary of my talk I will review the following the following three
theoretical aspects of the quantum neutrino: current status, why we need
precision measurements and neutrino oscillations amplitudes.
|
[
{
"created": "Mon, 29 Jan 2018 17:36:18 GMT",
"version": "v1"
}
] |
2018-01-30
|
[
[
"Parke",
"Stephen",
""
]
] |
In this summary of my talk I will review the following the following three theoretical aspects of the quantum neutrino: current status, why we need precision measurements and neutrino oscillations amplitudes.
|
hep-ph/0403122
|
Stefan Groote
|
S. Groote, J.G. K\"orner and A.A. Pivovarov
|
Laurent series expansion of sunrise-type diagrams using configuration
space techniques
|
20 pages, 3 eps-figures included
|
Eur.Phys.J. C36 (2004) 471-482
|
10.1140/epjc/s2004-01974-2
|
MZ-TH/04-03
|
hep-ph
| null |
We show that configuration space techniques can be used to efficiently
calculate the complete Laurent series \eps-expansion of sunrise-type diagrams
to any loop order in D-dimensional space-time for any external momentum and for
arbitrary mass configurations. For negative powers of \eps the results are
obtained in analytical form. For positive powers of \eps including the finite
\eps^0 contribution the result is obtained numerically in terms of
low-dimensional integrals. We present general features of the calculation and
provide exemplary results up to five loop order which are compared to available
results in the literature.
|
[
{
"created": "Thu, 11 Mar 2004 16:24:24 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Aug 2004 09:10:52 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Groote",
"S.",
""
],
[
"Körner",
"J. G.",
""
],
[
"Pivovarov",
"A. A.",
""
]
] |
We show that configuration space techniques can be used to efficiently calculate the complete Laurent series \eps-expansion of sunrise-type diagrams to any loop order in D-dimensional space-time for any external momentum and for arbitrary mass configurations. For negative powers of \eps the results are obtained in analytical form. For positive powers of \eps including the finite \eps^0 contribution the result is obtained numerically in terms of low-dimensional integrals. We present general features of the calculation and provide exemplary results up to five loop order which are compared to available results in the literature.
|
1906.08353
|
Ulas Ozdem
|
U. Ozdem
|
Magnetic dipole moments of the spin-$\frac{3}{2}$ doubly heavy baryons
|
9 pages, 4 tables and 2 figures
|
Eur. Phys. J. A, 56 2 (2020) 34
|
10.1140/epja/s10050-020-00049-4
| null |
hep-ph hep-ex hep-lat
|
http://creativecommons.org/licenses/by/4.0/
|
The magnetic dipole moments of the spin-$\frac{3}{2}$ doubly charmed, bottom
and charmed-bottom baryons are obtained by means of the light-cone QCD sum
rule. The magnetic dipole moments of these baryons encode essential knowledge
of their inner structure and shape deformations. The numerical results are
given as, $\mu_{\Xi_{cc}^{*++}} = 2.94 \pm 0.95$, $\mu_{\Xi_{cc}^{*+}} = - 0.67
\pm 0.11$, $\mu_{\Omega_{cc}^{*+}} =- 0.52 \pm 0.07$, $\mu_{\Xi_{bb}^{*0}} =
2.30 \pm 0.55$, $\mu_{\Xi_{bb}^{*-}} = -1.39 \pm 0.32$, $\mu_{\Omega_{bb}^{*-}}
= -1.56 \pm 0.33$, $\mu_{\Xi_{bc}^{*+}} = 2.63 \pm 0.82$, $\mu_{\Xi_{bc}^{*0}}
= - 0.96 \pm 0.32$ and $\mu_{\Omega_{bc}^{*+}} =- 1.11 \pm 0.33$, respectively.
|
[
{
"created": "Wed, 19 Jun 2019 21:01:13 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Aug 2019 20:18:51 GMT",
"version": "v2"
},
{
"created": "Thu, 6 Feb 2020 15:03:34 GMT",
"version": "v3"
}
] |
2020-02-07
|
[
[
"Ozdem",
"U.",
""
]
] |
The magnetic dipole moments of the spin-$\frac{3}{2}$ doubly charmed, bottom and charmed-bottom baryons are obtained by means of the light-cone QCD sum rule. The magnetic dipole moments of these baryons encode essential knowledge of their inner structure and shape deformations. The numerical results are given as, $\mu_{\Xi_{cc}^{*++}} = 2.94 \pm 0.95$, $\mu_{\Xi_{cc}^{*+}} = - 0.67 \pm 0.11$, $\mu_{\Omega_{cc}^{*+}} =- 0.52 \pm 0.07$, $\mu_{\Xi_{bb}^{*0}} = 2.30 \pm 0.55$, $\mu_{\Xi_{bb}^{*-}} = -1.39 \pm 0.32$, $\mu_{\Omega_{bb}^{*-}} = -1.56 \pm 0.33$, $\mu_{\Xi_{bc}^{*+}} = 2.63 \pm 0.82$, $\mu_{\Xi_{bc}^{*0}} = - 0.96 \pm 0.32$ and $\mu_{\Omega_{bc}^{*+}} =- 1.11 \pm 0.33$, respectively.
|
2112.02103
|
Alexis Plascencia
|
Pavel Fileviez Perez, Alexis D. Plascencia
|
Theory of Dirac Dark Matter: Higgs Decays and EDMs
|
15 pages, 8 figures and 6 appendices. v2: minor corrections, version
matches published version in Physical Review D
|
Phys. Rev. D 105, 095021 (2022)
|
10.1103/PhysRevD.105.095021
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We discuss a simple theory predicting the existence of a Dirac dark matter
candidate from gauge anomaly cancellation. In this theory, the spontaneous
breaking of local baryon number at the low scale can be understood. We show
that the constraint from the dark matter relic abundance implies an upper bound
on the theory of a few tens of TeV. We study the correlation between the dark
matter constraints and the prediction for the electric dipole moment (EDM) of
the electron. We point out the implications for the diphoton decay width of the
Standard Model Higgs. Furthermore, we study the decays of the new Higgs present
in the theory, we show that the branching ratio into two photons can be large
and discuss the strong correlation between the dark matter constraints and the
properties of the new Higgs decays. This theory could be tested at current or
future experiments by combining the results from dark matter, collider and EDM
experiments.
|
[
{
"created": "Fri, 3 Dec 2021 19:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 17 May 2022 15:16:34 GMT",
"version": "v2"
}
] |
2022-05-18
|
[
[
"Perez",
"Pavel Fileviez",
""
],
[
"Plascencia",
"Alexis D.",
""
]
] |
We discuss a simple theory predicting the existence of a Dirac dark matter candidate from gauge anomaly cancellation. In this theory, the spontaneous breaking of local baryon number at the low scale can be understood. We show that the constraint from the dark matter relic abundance implies an upper bound on the theory of a few tens of TeV. We study the correlation between the dark matter constraints and the prediction for the electric dipole moment (EDM) of the electron. We point out the implications for the diphoton decay width of the Standard Model Higgs. Furthermore, we study the decays of the new Higgs present in the theory, we show that the branching ratio into two photons can be large and discuss the strong correlation between the dark matter constraints and the properties of the new Higgs decays. This theory could be tested at current or future experiments by combining the results from dark matter, collider and EDM experiments.
|
hep-ph/9612201
|
Gestt Trentadue
|
A.B. Arbuzov (Dubna, JINR), G.I. Gach (Kharkov, FTI), V.Yu. Gontchar
(Kharkov, FTI), E.A. Kuraev (Dubna, JINR), N.P. Merenkov (Kharkov, FTI), L.
Trentadue (Parm U. & INFN, Parma)
|
Small-Angle Bhabha Scattering at LEP1. Analytical Results for
Wide-Narrow Angular Acceptance
|
13 pages, LaTeX, submitted to Phys. Lett. B, corrected according to
referee remarks
|
Phys.Lett. B399 (1997) 312-320
|
10.1016/S0370-2693(97)00307-9
| null |
hep-ph
| null |
Analytical formulae for small-angle Bhabha scattering cross-section at LEP1
are given for the case of wide-narrow angular acceptance. Inclusive and
calorimeter event selections are considered. Numerical results are presented.
|
[
{
"created": "Fri, 29 Nov 1996 08:43:31 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Dec 1996 10:36:02 GMT",
"version": "v2"
},
{
"created": "Tue, 4 Feb 1997 14:57:12 GMT",
"version": "v3"
}
] |
2009-10-30
|
[
[
"Arbuzov",
"A. B.",
"",
"Dubna, JINR"
],
[
"Gach",
"G. I.",
"",
"Kharkov, FTI"
],
[
"Gontchar",
"V. Yu.",
"",
"Kharkov, FTI"
],
[
"Kuraev",
"E. A.",
"",
"Dubna, JINR"
],
[
"Merenkov",
"N. P.",
"",
"Kharkov, FTI"
],
[
"Trentadue",
"L.",
"",
"Parm U. & INFN, Parma"
]
] |
Analytical formulae for small-angle Bhabha scattering cross-section at LEP1 are given for the case of wide-narrow angular acceptance. Inclusive and calorimeter event selections are considered. Numerical results are presented.
|
1604.03108
|
Markus A. Luty
|
Christina Gao, Markus A. Luty, Michael Mulhearn, Nicol\'as A. Neill,
Zhangqier Wang
|
Searching for Additional Higgs Bosons via Higgs Cascades
|
24 pages, 12 figures
|
Phys. Rev. D 97, 075040 (2018)
|
10.1103/PhysRevD.97.075040
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The discovery of a 125 GeV Higgs boson at the Large Hadron Collider strongly
motivates direct searches for additional Higgs bosons. In a type I two Higgs
doublet model there is a large region of parameter space at $\tan\beta > 5$
that is currently unconstrained experimentally. We show that the process $gg
\to H \to A Z \to ZZh$ can probe this region, and can be the discovery mode for
an extended Higgs sector at the LHC. We analyze 9 promising decay modes for the
$ZZh$ state, and we find that the most sensitive final states are
$\ell\ell\ell\ell bb$, $\ell\ell jjbb$, $\ell\ell\nu\nu\gamma\gamma$ and
$\ell\ell\ell\ell +{}$missing energy.
|
[
{
"created": "Mon, 11 Apr 2016 20:00:01 GMT",
"version": "v1"
}
] |
2018-05-02
|
[
[
"Gao",
"Christina",
""
],
[
"Luty",
"Markus A.",
""
],
[
"Mulhearn",
"Michael",
""
],
[
"Neill",
"Nicolás A.",
""
],
[
"Wang",
"Zhangqier",
""
]
] |
The discovery of a 125 GeV Higgs boson at the Large Hadron Collider strongly motivates direct searches for additional Higgs bosons. In a type I two Higgs doublet model there is a large region of parameter space at $\tan\beta > 5$ that is currently unconstrained experimentally. We show that the process $gg \to H \to A Z \to ZZh$ can probe this region, and can be the discovery mode for an extended Higgs sector at the LHC. We analyze 9 promising decay modes for the $ZZh$ state, and we find that the most sensitive final states are $\ell\ell\ell\ell bb$, $\ell\ell jjbb$, $\ell\ell\nu\nu\gamma\gamma$ and $\ell\ell\ell\ell +{}$missing energy.
|
hep-ph/0110201
|
Dan Hooper
|
Francis Halzen and Dan Hooper
|
Neutrinos from the Annihilation or Decay of Superheavy Relic Dark Matter
Particles
|
4 pages, 2 figures
|
For the proceedings of Dark Matter 2002, Los Angeles, CA
| null |
MADPH-01-1244
|
hep-ph astro-ph
| null |
In light of the mounting evidence that the highest energy cosmic rays are
dominated by protons and not gamma-rays, we discuss the prospect that these
cosmic rays are generated in the decay or annihilation of superheavy relic
particles. We calculate the high energy neutrino spectrum which results and
normalize our results to the ultra-high energy cosmic ray spectrum. We show
that most scenerios are already constrained by present limits placed by the
AMANDA experiment.
|
[
{
"created": "Tue, 16 Oct 2001 13:51:17 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Jan 2002 16:38:09 GMT",
"version": "v2"
},
{
"created": "Tue, 9 Apr 2002 16:15:03 GMT",
"version": "v3"
}
] |
2007-05-23
|
[
[
"Halzen",
"Francis",
""
],
[
"Hooper",
"Dan",
""
]
] |
In light of the mounting evidence that the highest energy cosmic rays are dominated by protons and not gamma-rays, we discuss the prospect that these cosmic rays are generated in the decay or annihilation of superheavy relic particles. We calculate the high energy neutrino spectrum which results and normalize our results to the ultra-high energy cosmic ray spectrum. We show that most scenerios are already constrained by present limits placed by the AMANDA experiment.
|
1608.05682
|
Marco Frasca
|
Marco Frasca
|
Finite temperature corrections to a NLO Nambu-Jona-Lasinio model
|
4 pages, 2 figures. Contribution to the proceedings of the 19th
International Conference in Quantum Chromodynamics (QCD 16), 4 July - 8 July
2016, Montpellier (France).Added the reference to the review by Brodsky, de
Teramond and Deur
|
Nuclear and Particle Physics Proceedings 282-284, 173-176 (2017)
|
10.1016/j.nuclphysbps.2016.12.033
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive the next-to-leading order correction to the Nambu-Jona-Lasinio
model starting from quantum chromodynamics. So, we are able to fix the
constants of the Nambu-Jona-Lasinio model from quantum chromodynamics and
analyze the behavior of strong interactions at low energies. The technique is
to expand in powers of currents the generating functional. We apply it to a
simple Yukawa model with self-interaction showing how this has a
Nambu-Jona-Lasinio model and its higher order corrections as a low-energy
limit. The same is shown to happen for quantum chromodynamics in the chiral
limit with two quarks. We prove that a consistent thermodynamic behaviour is
obtained as expected for the given parameters.
|
[
{
"created": "Fri, 19 Aug 2016 17:54:33 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Aug 2016 11:30:34 GMT",
"version": "v2"
}
] |
2017-03-21
|
[
[
"Frasca",
"Marco",
""
]
] |
We derive the next-to-leading order correction to the Nambu-Jona-Lasinio model starting from quantum chromodynamics. So, we are able to fix the constants of the Nambu-Jona-Lasinio model from quantum chromodynamics and analyze the behavior of strong interactions at low energies. The technique is to expand in powers of currents the generating functional. We apply it to a simple Yukawa model with self-interaction showing how this has a Nambu-Jona-Lasinio model and its higher order corrections as a low-energy limit. The same is shown to happen for quantum chromodynamics in the chiral limit with two quarks. We prove that a consistent thermodynamic behaviour is obtained as expected for the given parameters.
|
hep-ph/9604328
| null |
R. Harlander, M. Jezabek, J.H. Kuehn, M. Peter
|
Top Quark Polarization in Polarized $e^+e^-$ Annihilation near Threshold
|
LaTeX2e, 46 pages, 18 postscript figures included. Uses epsf. The
complete paper, including figures, is also available via anonymous ftp at
ftp://www-ttp.physik.uni-karlsruhe.de/ , or via www at
http://www-ttp.physik.uni-karlsruhe.de/cgi-bin/preprints
|
Z.Phys. C73 (1997) 477-494
| null |
TTP95-48
|
hep-ph
| null |
Top quark polarization in $e^+e^-$ annihilation into $t\bar t$ is calculated
for linearly polarized beams. The Green function formalism is applied to this
reaction near threshold. The Lippmann--Schwinger equations for the $S$-wave and
$P$-wave Green functions are solved numerically for the QCD chromostatic
potential given by the two-loop formula for large momentum transfer and
Richardson's ansatz for intermediate and small momenta. $S$-$P$--wave
interference contributes to all components of the top quark polarization
vector. Rescattering of the decay products is considered. The mean values
$\langle n \ell \rangle$ of the charged lepton four-momentum projections on
appropriately chosen directions $n$ in semileptonic top decays are proposed as
experimentally observable quantities sensitive to top quark polarization. The
results for $\langle n \ell \rangle$ are obtained including $S$-$P$--wave
interference and rescattering of the decay products. It is demonstrated that
for the longitudinally polarized electron beam a highly polarized sample of top
quarks can be produced.
|
[
{
"created": "Tue, 16 Apr 1996 13:23:47 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Harlander",
"R.",
""
],
[
"Jezabek",
"M.",
""
],
[
"Kuehn",
"J. H.",
""
],
[
"Peter",
"M.",
""
]
] |
Top quark polarization in $e^+e^-$ annihilation into $t\bar t$ is calculated for linearly polarized beams. The Green function formalism is applied to this reaction near threshold. The Lippmann--Schwinger equations for the $S$-wave and $P$-wave Green functions are solved numerically for the QCD chromostatic potential given by the two-loop formula for large momentum transfer and Richardson's ansatz for intermediate and small momenta. $S$-$P$--wave interference contributes to all components of the top quark polarization vector. Rescattering of the decay products is considered. The mean values $\langle n \ell \rangle$ of the charged lepton four-momentum projections on appropriately chosen directions $n$ in semileptonic top decays are proposed as experimentally observable quantities sensitive to top quark polarization. The results for $\langle n \ell \rangle$ are obtained including $S$-$P$--wave interference and rescattering of the decay products. It is demonstrated that for the longitudinally polarized electron beam a highly polarized sample of top quarks can be produced.
|
hep-ph/0608160
|
Alfonso Rosado
|
A. Rosado
|
Charged Higgs boson contribution to $\nu_{\tau} {\cal N} \to \tau^- X$
for very large $\tan\beta$ in the two Higgs doublet model with UHE-neutrinos
|
10 pages, 5 figures
|
Phys.Rev. D74 (2006) 057301
|
10.1103/PhysRevD.74.057301
| null |
hep-ph
| null |
We study the deep inelastic process $\nu_{\tau} + {\cal N} \to \tau^{-} + X$
(with ${\cal N} \equiv (n+p)/2$ an isoscalar nucleon), in the context of the
two Higgs doublet model {\it type two} (2HDM(II)). In particular, we discuss
the contribution to the total cross section of diagrams, in which a charged
Higgs boson is exchanged. We show that for large values of $\tan\beta$ such
contribution for an inclusive dispersion generated through the collision of an
ultrahigh energy tau-neutrino on a target nucleon can reach up to 57% of the
value of the contribution of the $W^+$ exchange diagrams (i.e. can reach up to
57% of the standard model (SM) prediction) and could permit to distinguish
between the SM and the 2HDM(II) predictions at the Pierre Auger Observatory.
|
[
{
"created": "Mon, 14 Aug 2006 19:21:33 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Sep 2006 14:55:38 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Rosado",
"A.",
""
]
] |
We study the deep inelastic process $\nu_{\tau} + {\cal N} \to \tau^{-} + X$ (with ${\cal N} \equiv (n+p)/2$ an isoscalar nucleon), in the context of the two Higgs doublet model {\it type two} (2HDM(II)). In particular, we discuss the contribution to the total cross section of diagrams, in which a charged Higgs boson is exchanged. We show that for large values of $\tan\beta$ such contribution for an inclusive dispersion generated through the collision of an ultrahigh energy tau-neutrino on a target nucleon can reach up to 57% of the value of the contribution of the $W^+$ exchange diagrams (i.e. can reach up to 57% of the standard model (SM) prediction) and could permit to distinguish between the SM and the 2HDM(II) predictions at the Pierre Auger Observatory.
|
hep-ph/9604381
|
Kubota Takahiro
|
S. Kanemura, T. Kubota and H.-A. Tohyama
|
Generalized screening theorem for Higgs decay processes in the
two-doublet model
|
42 pages, latex, 9 figures
|
Nucl.Phys. B483 (1997) 111-140; Erratum-ibid. B506 (1997) 548-550
|
10.1016/S0550-3213(96)00560-3
|
OU-HET 242
|
hep-ph
| null |
The radiative corrections to the decay processes of the neutral ($CP$-even)
Higgs boson ($H$) into a longitudinal gauge boson pair, {\it i.e.}, $H
\rightarrow Z_{L}Z_{L}$ and $H \rightarrow W_{L}^{+}W_{L}^{-}$ are analyzed in
the two-Higgs doublet model by assuming that all of the Higgs boson masses are
much greater than the $W$ and $Z$ bosons'. These calculations are motivated to
see if one could see potentially large virtual effects to these decay rates due
to the charged and $CP$-odd neutral Higgs boson masses ($m_{G}$ and $m_{A}$,
respectively) which are supposed to be larger than $m_{H}$. It is pointed out
that, although the radiative corrections to the decay width $\Gamma
(H\rightarrow W_{L}^{+}W_{L}^{-})$ depend sensitively in general on $m_{G}$ and
$m_{A}$, there occurs a screening effect, {\it i.e.,} cancellation in leading
terms once we set $m_{G}=m_{A}$, so that the radiative corrections tend to be
minimized. It is also pointed out that the decay rate $\Gamma (H\rightarrow
Z_{L}Z_{L})$ is fairly insensitive to the other heavier Higgs masses and is
possibly a good measuring tool of the Higgs mixing angle. The mechanism of
these screening phenomena in the Higgs decays is explained on the basis of a
new screening theorem, which we postulate with reference to the custodial
symmetry in the Higgs potential.
|
[
{
"created": "Mon, 22 Apr 1996 10:51:21 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Kanemura",
"S.",
""
],
[
"Kubota",
"T.",
""
],
[
"Tohyama",
"H. -A.",
""
]
] |
The radiative corrections to the decay processes of the neutral ($CP$-even) Higgs boson ($H$) into a longitudinal gauge boson pair, {\it i.e.}, $H \rightarrow Z_{L}Z_{L}$ and $H \rightarrow W_{L}^{+}W_{L}^{-}$ are analyzed in the two-Higgs doublet model by assuming that all of the Higgs boson masses are much greater than the $W$ and $Z$ bosons'. These calculations are motivated to see if one could see potentially large virtual effects to these decay rates due to the charged and $CP$-odd neutral Higgs boson masses ($m_{G}$ and $m_{A}$, respectively) which are supposed to be larger than $m_{H}$. It is pointed out that, although the radiative corrections to the decay width $\Gamma (H\rightarrow W_{L}^{+}W_{L}^{-})$ depend sensitively in general on $m_{G}$ and $m_{A}$, there occurs a screening effect, {\it i.e.,} cancellation in leading terms once we set $m_{G}=m_{A}$, so that the radiative corrections tend to be minimized. It is also pointed out that the decay rate $\Gamma (H\rightarrow Z_{L}Z_{L})$ is fairly insensitive to the other heavier Higgs masses and is possibly a good measuring tool of the Higgs mixing angle. The mechanism of these screening phenomena in the Higgs decays is explained on the basis of a new screening theorem, which we postulate with reference to the custodial symmetry in the Higgs potential.
|
hep-ph/0201228
|
Thomas G. Rizzo
|
Thomas G. Rizzo
|
Black Hole Production at the LHC: Effects of Voloshin Suppression
|
12 pages, 4 figures, LaTex
|
JHEP 0202:011,2002
|
10.1088/1126-6708/2002/02/011
|
SLAC-PUB-9127
|
hep-ph
| null |
We examine the rates for the production of black holes(BH) at the LHC in
light of the exponential suppression of the geometric cross section estimate
recently proposed by Voloshin. We show that the resulting production rates will
still be quite large over a reasonably wide range of model parameters. While BH
production may no longer be the dominant collider process, its unique signature
will ensure observability over more conventional backgrounds.
|
[
{
"created": "Wed, 23 Jan 2002 23:30:38 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Rizzo",
"Thomas G.",
""
]
] |
We examine the rates for the production of black holes(BH) at the LHC in light of the exponential suppression of the geometric cross section estimate recently proposed by Voloshin. We show that the resulting production rates will still be quite large over a reasonably wide range of model parameters. While BH production may no longer be the dominant collider process, its unique signature will ensure observability over more conventional backgrounds.
|
hep-ph/0203102
|
Andrei Demichev
|
A.Demichev, A.Kryukov and A.Rodionov
|
XML-Based Formulation of Field Theoretical Models. A Proposal for a
Future Standard and Data Base for Model Storage, Exchange and Cross-checking
of Results
|
Talk at the International Workshop ``Automatic Calculation for Future
Colliders'' (CPP2001), November 28-30, 2001, Tokyo, Japan
| null | null | null |
hep-ph
| null |
We propose an XML-based standard for formulation of field theoretical models.
The goal of creation of such a standard is to provide a way for an unambiguous
exchange and cross-checking of results of computer calculations in high energy
physics. At the moment, the suggested standard implies that models under
consideration are of the SM or MSSM type (i.e., they are just SM or MSSM, their
submodels, smooth modifications or straightforward generalizations).
|
[
{
"created": "Mon, 11 Mar 2002 15:31:21 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Demichev",
"A.",
""
],
[
"Kryukov",
"A.",
""
],
[
"Rodionov",
"A.",
""
]
] |
We propose an XML-based standard for formulation of field theoretical models. The goal of creation of such a standard is to provide a way for an unambiguous exchange and cross-checking of results of computer calculations in high energy physics. At the moment, the suggested standard implies that models under consideration are of the SM or MSSM type (i.e., they are just SM or MSSM, their submodels, smooth modifications or straightforward generalizations).
|
2105.06252
|
Yuka Oshima
|
Yuka Oshima, Hiroki Fujimoto, Masaki Ando, Tomohiro Fujita, Yuta
Michimura, Koji Nagano, Ippei Obata, Taihei Watanabe
|
Dark matter Axion search with riNg Cavity Experiment DANCE: Current
sensitivity
|
4 pages, 2 figures, contribution to the 2021 Gravitation session of
the 55th Rencontres de Moriond, added references
| null | null | null |
hep-ph astro-ph.IM physics.ins-det
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
Dark matter Axion search with riNg Cavity Experiment (DANCE) was proposed. To
search for axion-like particles, we aim to detect the rotation and oscillation
of optical linear polarization caused by axion-photon coupling with a bow-tie
cavity. DANCE can improve the sensitivity to axion-photon coupling constant
$g_{a \gamma}$ for axion mass $m_a < 10^{-10} \, \rm{eV}$ by several orders of
magnitude compared to the best upper limits at present. A prototype experiment
DANCE Act-1 is in progress to demonstrate the feasibility of the method and to
investigate technical noises. We assembled the optics, evaluated the
performance of the cavity, and estimated the current sensitivity. If we observe
for a year, we can reach $g_{a \gamma} \simeq 9 \times 10^{-7} \,
\rm{GeV^{-1}}$ at $m_a \simeq 10^{-13} \, \rm{eV}$. The current sensitivity was
believed to be limited by laser intensity noise at low frequencies and by
mechanical vibration at high frequencies.
|
[
{
"created": "Thu, 13 May 2021 12:57:28 GMT",
"version": "v1"
},
{
"created": "Mon, 17 May 2021 02:05:20 GMT",
"version": "v2"
}
] |
2021-05-18
|
[
[
"Oshima",
"Yuka",
""
],
[
"Fujimoto",
"Hiroki",
""
],
[
"Ando",
"Masaki",
""
],
[
"Fujita",
"Tomohiro",
""
],
[
"Michimura",
"Yuta",
""
],
[
"Nagano",
"Koji",
""
],
[
"Obata",
"Ippei",
""
],
[
"Watanabe",
"Taihei",
""
]
] |
Dark matter Axion search with riNg Cavity Experiment (DANCE) was proposed. To search for axion-like particles, we aim to detect the rotation and oscillation of optical linear polarization caused by axion-photon coupling with a bow-tie cavity. DANCE can improve the sensitivity to axion-photon coupling constant $g_{a \gamma}$ for axion mass $m_a < 10^{-10} \, \rm{eV}$ by several orders of magnitude compared to the best upper limits at present. A prototype experiment DANCE Act-1 is in progress to demonstrate the feasibility of the method and to investigate technical noises. We assembled the optics, evaluated the performance of the cavity, and estimated the current sensitivity. If we observe for a year, we can reach $g_{a \gamma} \simeq 9 \times 10^{-7} \, \rm{GeV^{-1}}$ at $m_a \simeq 10^{-13} \, \rm{eV}$. The current sensitivity was believed to be limited by laser intensity noise at low frequencies and by mechanical vibration at high frequencies.
|
hep-ph/0306011
|
Grigori Volovik
|
G.E. Volovik
|
On contributions of fundamental particles to the vacuum energy
|
LaTeX file, 12 pages, 1 figure, extended for proceedings of
International Conference "I.Ya. Pomeranchuk and Physics at the Turn of
Centuries", Moscow, 2003
| null |
10.1142/9789812702883_0015
| null |
hep-ph cond-mat gr-qc
| null |
Recently different regularization schemes for calculations of the vacuum
energy stored in the zero-point motion of fundamental fields were discussed. We
show that the contribution of the fermionic and bosonic fields to the energy of
the vacuum depends on the physical realization of the vacuum state. The energy
density of the homogeneous vacuum is zero irrespective of the fermionic and
bosonic content of the effective theories in the infra-red corner. The
contribution of the low-energy fermions and bosons becomes important when the
coexistence of different vacua is considered, such as the bubble of the true
vacuum inside the false one. We consider the case when these vacua differ only
by the masses of the low-energy fermionic fields, M(true)>M(false), while their
ultraviolet structure is identical. In this geometry the energy density of the
false vacuum outside the bubble is zero, rho(false)=-P(false)=0, which
corresponds to zero cosmological constant. The energy density of the true
vacuum inside the bubble rho(true)=-P(true) is proportional to -
Lambda^2(M^2(true)- M^2(false)), where Lambda is the ultraviolet cut-off.
|
[
{
"created": "Mon, 2 Jun 2003 12:42:51 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Jun 2003 07:30:42 GMT",
"version": "v2"
}
] |
2017-08-23
|
[
[
"Volovik",
"G. E.",
""
]
] |
Recently different regularization schemes for calculations of the vacuum energy stored in the zero-point motion of fundamental fields were discussed. We show that the contribution of the fermionic and bosonic fields to the energy of the vacuum depends on the physical realization of the vacuum state. The energy density of the homogeneous vacuum is zero irrespective of the fermionic and bosonic content of the effective theories in the infra-red corner. The contribution of the low-energy fermions and bosons becomes important when the coexistence of different vacua is considered, such as the bubble of the true vacuum inside the false one. We consider the case when these vacua differ only by the masses of the low-energy fermionic fields, M(true)>M(false), while their ultraviolet structure is identical. In this geometry the energy density of the false vacuum outside the bubble is zero, rho(false)=-P(false)=0, which corresponds to zero cosmological constant. The energy density of the true vacuum inside the bubble rho(true)=-P(true) is proportional to - Lambda^2(M^2(true)- M^2(false)), where Lambda is the ultraviolet cut-off.
|
2306.08675
|
Shiladitya Porey
|
Anish Ghoshal, Maxim Yu. Khlopov, Zygmunt Lalak, Shiladitya Porey
|
Post-inflationary production of particle Dark Matter: non-minimal
Natural inflationary scenarios
|
33 pages, 6 figures
| null | null | null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the production of non-thermal fermionic dark matter particles
during the reheating era following slow roll inflation, driven by axion-like
pseudo-Nambu-Goldstone boson, $\varphi$, that is non-minimally coupled to the
curvature scalar, ${\cal R}$. We consider two types of non-minimal coupling,
one of which is $\xi \varphi^2 {\cal R}$ (referred to as NM-N), and the other
one is $\alpha\left( 1+ \cos\left(\frac{\varphi}{f_a}\right)\right)$ (referred
to as NMP-N), where $\alpha$ and $\xi$ are dimensionless parameters and $f_a$
is an energy scale. We determine benchmark values for both inflationary
scenarios satisfying current bounds from Cosmic Microwave Background (CMB)
radiation measurement and find the mass of inflaton to be $\sim {\cal
O}\left(10^{12}\right) \text{GeV}$ for both inflationary scenarios and
tensor-to-scalar ratio, $r\sim 0.0177$ (for NM-N) and $\sim 0.0097$ (for NMP-N)
which fall inside $1-\sigma$ contour on scalar spectral index versus $r$ plane
of Planck 2018+Bicep 3+Keck Array 2018 joint analysis, and can be probed by
future CMB observations e.g. Simons Observatory. We then show that dark matter
particles produced from the decay of inflaton can fully match the present-day
cold dark matter (CDM) yield, as well as other cosmological constraints, if the
coupling value between inflaton and dark matter, $y_\chi$, and the dark matter
mass, $m_\chi$, are within the range $10^{-6}\gtrsim y_\chi\gtrsim 10^{-17}$
and ${\cal O}(1\text{GeV})\lesssim m_\chi\lesssim m_\phi/2$, where $m_\phi$
denotes the mass of inflaton. The exact range of $y_\chi$ and $m_\chi$ varies
with different benchmark values as well as parameters of inflation, like energy
scale of inflation and $r$, some of which are within the reach of next
generation CMB experiments.
|
[
{
"created": "Wed, 14 Jun 2023 18:00:02 GMT",
"version": "v1"
}
] |
2023-06-16
|
[
[
"Ghoshal",
"Anish",
""
],
[
"Khlopov",
"Maxim Yu.",
""
],
[
"Lalak",
"Zygmunt",
""
],
[
"Porey",
"Shiladitya",
""
]
] |
We investigate the production of non-thermal fermionic dark matter particles during the reheating era following slow roll inflation, driven by axion-like pseudo-Nambu-Goldstone boson, $\varphi$, that is non-minimally coupled to the curvature scalar, ${\cal R}$. We consider two types of non-minimal coupling, one of which is $\xi \varphi^2 {\cal R}$ (referred to as NM-N), and the other one is $\alpha\left( 1+ \cos\left(\frac{\varphi}{f_a}\right)\right)$ (referred to as NMP-N), where $\alpha$ and $\xi$ are dimensionless parameters and $f_a$ is an energy scale. We determine benchmark values for both inflationary scenarios satisfying current bounds from Cosmic Microwave Background (CMB) radiation measurement and find the mass of inflaton to be $\sim {\cal O}\left(10^{12}\right) \text{GeV}$ for both inflationary scenarios and tensor-to-scalar ratio, $r\sim 0.0177$ (for NM-N) and $\sim 0.0097$ (for NMP-N) which fall inside $1-\sigma$ contour on scalar spectral index versus $r$ plane of Planck 2018+Bicep 3+Keck Array 2018 joint analysis, and can be probed by future CMB observations e.g. Simons Observatory. We then show that dark matter particles produced from the decay of inflaton can fully match the present-day cold dark matter (CDM) yield, as well as other cosmological constraints, if the coupling value between inflaton and dark matter, $y_\chi$, and the dark matter mass, $m_\chi$, are within the range $10^{-6}\gtrsim y_\chi\gtrsim 10^{-17}$ and ${\cal O}(1\text{GeV})\lesssim m_\chi\lesssim m_\phi/2$, where $m_\phi$ denotes the mass of inflaton. The exact range of $y_\chi$ and $m_\chi$ varies with different benchmark values as well as parameters of inflation, like energy scale of inflation and $r$, some of which are within the reach of next generation CMB experiments.
|
hep-ph/0402232
|
Tomohiro Matsuda
|
Tomohiro Matsuda
|
Formation of cosmological brane defects
|
27 pages, 6 figures, to appear in JHEP
|
JHEP0411:039,2004
|
10.1088/1126-6708/2004/11/039
| null |
hep-ph astro-ph hep-th
| null |
We study cosmological formation of D-term strings, axionic strings, domain
walls and Q-balls in braneworld models of the Hanany-Witten type. For the
D-term strings, we show that the strings are the daughter branes extended
between mother branes. We show that the domain walls can be produced by
conventional cosmological phase transitions. In this case, the formation of the
domain walls is induced by the continuous deformation of the branes, which
means that they are not created as daughter branes. First we consider classical
configurations of the axionic strings and the domain walls, then we investigate
the quantum effect of the brane dynamics. We also study brane Q-balls and show
how they can be distinguished from conventional Q-balls.
|
[
{
"created": "Mon, 23 Feb 2004 05:25:24 GMT",
"version": "v1"
},
{
"created": "Fri, 28 May 2004 05:11:26 GMT",
"version": "v2"
},
{
"created": "Sat, 23 Oct 2004 08:28:22 GMT",
"version": "v3"
},
{
"created": "Fri, 19 Nov 2004 07:47:51 GMT",
"version": "v4"
}
] |
2008-11-26
|
[
[
"Matsuda",
"Tomohiro",
""
]
] |
We study cosmological formation of D-term strings, axionic strings, domain walls and Q-balls in braneworld models of the Hanany-Witten type. For the D-term strings, we show that the strings are the daughter branes extended between mother branes. We show that the domain walls can be produced by conventional cosmological phase transitions. In this case, the formation of the domain walls is induced by the continuous deformation of the branes, which means that they are not created as daughter branes. First we consider classical configurations of the axionic strings and the domain walls, then we investigate the quantum effect of the brane dynamics. We also study brane Q-balls and show how they can be distinguished from conventional Q-balls.
|
1901.05345
|
Dennis E. Krause
|
Quan Le Thien and Dennis E. Krause
|
Spin-Independent Two-Neutrino Exchange Potential with Mixing and
$CP$-Violation
|
19 pages, 7 figures (ReVTeX), new Fig. 7, small changes to match
published version
|
Phys. Rev. D 99, 116006 (2019)
|
10.1103/PhysRevD.99.116006
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We develop a new approach for calculating the spin-independent 2-neutrino
exchange potential (2-NEP) between non-relativistic fermions which places
emphasis on the neutrino vacuum state, an area of theoretical interest in
recent years. The 2-NEP is a natural probe of fundamental issues of neutrino
physics such as neutrino masses, flavor mixing, the number of neutrino flavors,
neutrino nature (Dirac or Majorana), $CP$-violation, and the neutrino vacuum
state. We explore the dependence of the 2-NEP on the mixing of neutrino mass
states assuming normal and inverted mass ordering for nucleon-nucleon,
nucleon-lepton, and lepton-lepton interactions, and the $CP$-violation phase in
the neutrino mixing matrix.
|
[
{
"created": "Wed, 16 Jan 2019 15:28:16 GMT",
"version": "v1"
},
{
"created": "Sat, 11 May 2019 20:10:59 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Jun 2019 00:33:35 GMT",
"version": "v3"
}
] |
2019-06-13
|
[
[
"Thien",
"Quan Le",
""
],
[
"Krause",
"Dennis E.",
""
]
] |
We develop a new approach for calculating the spin-independent 2-neutrino exchange potential (2-NEP) between non-relativistic fermions which places emphasis on the neutrino vacuum state, an area of theoretical interest in recent years. The 2-NEP is a natural probe of fundamental issues of neutrino physics such as neutrino masses, flavor mixing, the number of neutrino flavors, neutrino nature (Dirac or Majorana), $CP$-violation, and the neutrino vacuum state. We explore the dependence of the 2-NEP on the mixing of neutrino mass states assuming normal and inverted mass ordering for nucleon-nucleon, nucleon-lepton, and lepton-lepton interactions, and the $CP$-violation phase in the neutrino mixing matrix.
|
0706.3388
|
Mariano Quiros
|
Germano Nardini, Mariano Quiros, Andrea Wulzer
|
A Confining Strong First-Order Electroweak Phase Transition
|
34 pages, 7 figures; v2: Reference added; v3: Version to appear in
JHEP
|
JHEP0709:077,2007
|
10.1088/1126-6708/2007/09/077
|
UAB-FT-632
|
hep-ph hep-th
| null |
In the Randall-Sundrum model where the radion is stabilized by a
Goldberger-Wise (GW) potential there is a supercooled transition from a
deconfined to a confined phase at temperatures orders of magnitude below the
typical Standard Model critical temperature. When the Higgs is localized at the
IR brane the electroweak phase transition is delayed and becomes a strong
first-order one where the Universe expands by a few e-folds. This generates the
possibility of having the out-of-equilibrium condition required by electroweak
baryogenesis in the electroweak phase transition. We have studied numerically
the region of the GW parameter space where the theory is consistent and the
latter possibility is realized. We have found that in most of the parameter
space the nucleation temperature is so low that sphalerons are totally inactive
inside the bubbles. The condition for sphalerons to be inactive after reheating
imposes an upper bound on the reheating temperature that is weaker for heavy
Higgs bosons so that the out-of-equilibrium condition seems to favor heavy over
light Higgses. The condition for sphalerons to be active outside the bubbles
puts an upper bound on the number of e-folds at the phase transition, roughly
consistent with the critical value required by low-scale inflation to solve the
cosmological horizon problem.
|
[
{
"created": "Fri, 22 Jun 2007 18:44:16 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Jul 2007 12:40:00 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Sep 2007 16:33:56 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Nardini",
"Germano",
""
],
[
"Quiros",
"Mariano",
""
],
[
"Wulzer",
"Andrea",
""
]
] |
In the Randall-Sundrum model where the radion is stabilized by a Goldberger-Wise (GW) potential there is a supercooled transition from a deconfined to a confined phase at temperatures orders of magnitude below the typical Standard Model critical temperature. When the Higgs is localized at the IR brane the electroweak phase transition is delayed and becomes a strong first-order one where the Universe expands by a few e-folds. This generates the possibility of having the out-of-equilibrium condition required by electroweak baryogenesis in the electroweak phase transition. We have studied numerically the region of the GW parameter space where the theory is consistent and the latter possibility is realized. We have found that in most of the parameter space the nucleation temperature is so low that sphalerons are totally inactive inside the bubbles. The condition for sphalerons to be inactive after reheating imposes an upper bound on the reheating temperature that is weaker for heavy Higgs bosons so that the out-of-equilibrium condition seems to favor heavy over light Higgses. The condition for sphalerons to be active outside the bubbles puts an upper bound on the number of e-folds at the phase transition, roughly consistent with the critical value required by low-scale inflation to solve the cosmological horizon problem.
|
1304.1290
|
Bin Wang
|
Bin Wang, Ming-Gang Zhao, Ke-Sheng Sun and Xue-Qian Li
|
Testing lepton flavor universality in terms of data of BES III and
charm-tau factory
|
24 pages, 9 figures, 3 tables
| null |
10.1088/1674-1137/37/7/073101
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The recent measurements on $R_K$ and $R_{\pi}$ imply that there exists a
possible violation of the leptonic flavor universality which is one of the
cornerstones of the standard model. It is suggested that a mixing between
sterile and active neutrinos might induce such a violation. In this work we
consider the scenarios with one or two sterile neutrinos to explicitly realize
the data while the constraints from the available experiments have been taken
into account. Moreover, as indicated in literature, the deviation of the real
PMNS matrix from the symmetric patterns may be due to a $\mu-\tau$ asymmetry,
therefore the measurements on $R_{D(D_s)e\mu} = \Gamma(D(D_s)\rightarrow
e^+\nu_e)/\Gamma(D(D_s)\rightarrow \mu^+\nu_\mu)$ and $R_{D(D_s)\mu\tau} =
\Gamma(D(D_s)\rightarrow \mu^+\nu_\mu)/\Gamma(D(D_s)\rightarrow
\mu^+\tau_\tau)$ (and for some other heavy mesons $B^{\pm}$ and $B_c$ etc.) may
shed more light on physics responsible for the violation of the leptonic flavor
universality. The data of BES III are available to test the universality and
that of the future charm-tau factory will provide more accurate information
towards the aspect, in this work, we will discuss $R_{D(D_s)e\mu}$ and
$R_{D(D_s)\mu\tau}$ in all details and also briefly consider the cases for
$B^{\pm}$ and $B_c$.
|
[
{
"created": "Thu, 4 Apr 2013 09:40:33 GMT",
"version": "v1"
}
] |
2015-06-15
|
[
[
"Wang",
"Bin",
""
],
[
"Zhao",
"Ming-Gang",
""
],
[
"Sun",
"Ke-Sheng",
""
],
[
"Li",
"Xue-Qian",
""
]
] |
The recent measurements on $R_K$ and $R_{\pi}$ imply that there exists a possible violation of the leptonic flavor universality which is one of the cornerstones of the standard model. It is suggested that a mixing between sterile and active neutrinos might induce such a violation. In this work we consider the scenarios with one or two sterile neutrinos to explicitly realize the data while the constraints from the available experiments have been taken into account. Moreover, as indicated in literature, the deviation of the real PMNS matrix from the symmetric patterns may be due to a $\mu-\tau$ asymmetry, therefore the measurements on $R_{D(D_s)e\mu} = \Gamma(D(D_s)\rightarrow e^+\nu_e)/\Gamma(D(D_s)\rightarrow \mu^+\nu_\mu)$ and $R_{D(D_s)\mu\tau} = \Gamma(D(D_s)\rightarrow \mu^+\nu_\mu)/\Gamma(D(D_s)\rightarrow \mu^+\tau_\tau)$ (and for some other heavy mesons $B^{\pm}$ and $B_c$ etc.) may shed more light on physics responsible for the violation of the leptonic flavor universality. The data of BES III are available to test the universality and that of the future charm-tau factory will provide more accurate information towards the aspect, in this work, we will discuss $R_{D(D_s)e\mu}$ and $R_{D(D_s)\mu\tau}$ in all details and also briefly consider the cases for $B^{\pm}$ and $B_c$.
|
1611.01117
|
Aleksander Kusina
|
A. Kusina
|
Nuclear parton distributions from the nCTEQ group
|
Presented at the XXIV International Workshop on Deep-Inelastic
Scattering and Related Subjects, 11-15 April, 2016, DESY Hamburg, Germany.
arXiv admin note: substantial text overlap with arXiv:1606.07624,
arXiv:1509.01801
|
PoS(DIS2016)026
| null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the nCTEQ15 global analysis of nuclear parton distribution
functions (nPDFs). The main addition to the previous nCTEQ PDFs is the
introduction of PDF uncertainties based on the Hessian method. Another
important improvement is the inclusion of pion production data from RHIC giving
us a handle to constrain gluon PDF. In this presentation we briefly discuss the
framework of our analysis and concentrate on the comparison of our results with
those of other groups. Additionally we show a first estimate of the impact of
the LHC pPb W/Z boson production data on the presented nCTEQ15 PDFs.
|
[
{
"created": "Thu, 3 Nov 2016 18:11:58 GMT",
"version": "v1"
}
] |
2016-11-04
|
[
[
"Kusina",
"A.",
""
]
] |
We present the nCTEQ15 global analysis of nuclear parton distribution functions (nPDFs). The main addition to the previous nCTEQ PDFs is the introduction of PDF uncertainties based on the Hessian method. Another important improvement is the inclusion of pion production data from RHIC giving us a handle to constrain gluon PDF. In this presentation we briefly discuss the framework of our analysis and concentrate on the comparison of our results with those of other groups. Additionally we show a first estimate of the impact of the LHC pPb W/Z boson production data on the presented nCTEQ15 PDFs.
|
hep-ph/0103280
|
Csaba Balazs
|
Howard Baer, Csaba Balazs, Javier Ferrandis and Xerxes Tata
|
Impact of Muon Anomalous Magnetic Moment on Supersymmetric Models
|
25 page REVTEX file with 10 PS figures. Minor rewording, typos
corrected, references added
|
Phys.Rev. D64 (2001) 035004
|
10.1103/PhysRevD.64.035004
|
FSU-HEP-030101, UH-511-983-01, IFIC/01-13
|
hep-ph
| null |
The recent measurement of a_\mu =\frac{g_\mu -2}{2} by the E821 Collaboration
at Brookhaven deviates from the quoted Standard Model (SM) central value
prediction by 2.6\sigma. The difference between SM theory and experiment may be
easily accounted for in a variety of particle physics models employing weak
scale supersymmetry (SUSY). Other supersymmetric models are distinctly
disfavored. We evaluate a_\mu for various supersymmetric models, including
minimal supergravity (mSUGRA), Yukawa unified SO(10) SUSY GUTs, models with
inverted mass hierarchies (IMH), models with non-universal gaugino masses,
gauge mediated SUSY breaking models (GMSB), anomaly-mediated SUSY breaking
models (AMSB) and models with gaugino mediated SUSY breaking (inoMSB). Models
with Yukawa coupling unification or multi-TeV first and second generation
scalars are disfavored by the a_\mu measurement.
|
[
{
"created": "Tue, 27 Mar 2001 23:09:40 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Apr 2001 22:57:42 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Baer",
"Howard",
""
],
[
"Balazs",
"Csaba",
""
],
[
"Ferrandis",
"Javier",
""
],
[
"Tata",
"Xerxes",
""
]
] |
The recent measurement of a_\mu =\frac{g_\mu -2}{2} by the E821 Collaboration at Brookhaven deviates from the quoted Standard Model (SM) central value prediction by 2.6\sigma. The difference between SM theory and experiment may be easily accounted for in a variety of particle physics models employing weak scale supersymmetry (SUSY). Other supersymmetric models are distinctly disfavored. We evaluate a_\mu for various supersymmetric models, including minimal supergravity (mSUGRA), Yukawa unified SO(10) SUSY GUTs, models with inverted mass hierarchies (IMH), models with non-universal gaugino masses, gauge mediated SUSY breaking models (GMSB), anomaly-mediated SUSY breaking models (AMSB) and models with gaugino mediated SUSY breaking (inoMSB). Models with Yukawa coupling unification or multi-TeV first and second generation scalars are disfavored by the a_\mu measurement.
|
hep-ph/0002062
|
Piotr Kielanowski
|
P. Kielanowski, S. R. Ju\'arez W. and J. G. Mora H.
|
Theorems on the Renormalization Group Evolution of Quark Yukawa
Couplings and CKM Matrix
|
10 pages, some factors of (4\pi) corrected
|
Phys.Lett.B479:181-189,2000
|
10.1016/S0370-2693(00)00295-1
| null |
hep-ph
| null |
We analyze the two loop renormalization group equations in the standard model
and its extensions for the coupling constants and the quark Yukawa couplings.
The key point of our analysis is the observed hierarchy of the quark masses and
the CKM matrix. For the one loop evolution we find the explicit solution for
the evolution of the Yukawa couplings and show the following: 1. the CKM matrix
depends on the energy on only one function of energy; 2. the ratios of the down
quark masses depend on the energy through the same function as the CKM matrix;
3. the diagonalizing matrices of the biunitary transformation of the up quarks
are energy independent. Next we give the explicit form of the two loop
corrections to the evolution of the quark Yukawa couplings and show that the
relative corrections are of the order (\lambda ^{4}) for the quark Yukawa
couplings and of the order (\lambda ^{5}) for the CKM matrix. Finally we give
the equations of the one loop evolution of the squares of the matrix elements
of the CKM matrix and their explicit solution.
|
[
{
"created": "Sat, 5 Feb 2000 14:04:30 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Feb 2000 14:21:12 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Kielanowski",
"P.",
""
],
[
"W.",
"S. R. Juárez",
""
],
[
"H.",
"J. G. Mora",
""
]
] |
We analyze the two loop renormalization group equations in the standard model and its extensions for the coupling constants and the quark Yukawa couplings. The key point of our analysis is the observed hierarchy of the quark masses and the CKM matrix. For the one loop evolution we find the explicit solution for the evolution of the Yukawa couplings and show the following: 1. the CKM matrix depends on the energy on only one function of energy; 2. the ratios of the down quark masses depend on the energy through the same function as the CKM matrix; 3. the diagonalizing matrices of the biunitary transformation of the up quarks are energy independent. Next we give the explicit form of the two loop corrections to the evolution of the quark Yukawa couplings and show that the relative corrections are of the order (\lambda ^{4}) for the quark Yukawa couplings and of the order (\lambda ^{5}) for the CKM matrix. Finally we give the equations of the one loop evolution of the squares of the matrix elements of the CKM matrix and their explicit solution.
|
1305.1627
|
Chee Sheng Fong
|
Chee Sheng Fong, Enrico Nardi
|
Spontaneous breaking of the flavor symmetry avoids the strong CP problem
|
4 pages
| null |
10.1103/PhysRevLett.111.061601
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A promising approach to the Standard Model flavor puzzle is based on the idea
that the $SU(3)^3$ quark-flavor symmetry is spontaneously broken by vacuum
expectation values of `Yukawa fields' which minimize the symmetry invariant
scalar potential at configurations corresponding to the observed quark masses
and mixing angles. We show that this approach provides a simple and elegant
explanation for CP conservation in strong interactions.
|
[
{
"created": "Tue, 7 May 2013 20:00:07 GMT",
"version": "v1"
}
] |
2013-08-14
|
[
[
"Fong",
"Chee Sheng",
""
],
[
"Nardi",
"Enrico",
""
]
] |
A promising approach to the Standard Model flavor puzzle is based on the idea that the $SU(3)^3$ quark-flavor symmetry is spontaneously broken by vacuum expectation values of `Yukawa fields' which minimize the symmetry invariant scalar potential at configurations corresponding to the observed quark masses and mixing angles. We show that this approach provides a simple and elegant explanation for CP conservation in strong interactions.
|
0901.4863
|
Masaki Asano
|
Masaki Asano, Eri Asakawa, Keisuke Fujii, Tomonori Kusano, Shigeki
Matsumoto, Rei Sasaki, Yosuke Takubo and Hitoshi Yamamoto
|
Measurements of the model parameter in the littlest Higgs model with
T-parity
|
4 pages, 2 figures. Talk given at LCWS08, Chicago, November 2008
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the Littlest Higgs model with T-parity, we study production processes of
new gauge bosons at the international linear collider (ILC). Through Monte
Carlo simulations of the production processes, we show that the heavy gauge
boson masses can be determined very accurately at the ILC for a representative
parameter point of the model. From the simulation result, we also discuss the
determination of other model parameters at the ILC.
|
[
{
"created": "Fri, 30 Jan 2009 11:57:58 GMT",
"version": "v1"
}
] |
2022-09-14
|
[
[
"Asano",
"Masaki",
""
],
[
"Asakawa",
"Eri",
""
],
[
"Fujii",
"Keisuke",
""
],
[
"Kusano",
"Tomonori",
""
],
[
"Matsumoto",
"Shigeki",
""
],
[
"Sasaki",
"Rei",
""
],
[
"Takubo",
"Yosuke",
""
],
[
"Yamamoto",
"Hitoshi",
""
]
] |
In the Littlest Higgs model with T-parity, we study production processes of new gauge bosons at the international linear collider (ILC). Through Monte Carlo simulations of the production processes, we show that the heavy gauge boson masses can be determined very accurately at the ILC for a representative parameter point of the model. From the simulation result, we also discuss the determination of other model parameters at the ILC.
|
0811.0967
|
Susan Gardner
|
S. Gardner
|
Shedding Light on Dark Matter: A Faraday Rotation Experiment to Limit a
Dark Magnetic Moment
|
24 pages, 5 figures
|
Phys.Rev.D79:055007,2009
|
10.1103/PhysRevD.79.055007
| null |
hep-ph astro-ph nucl-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A Faraday rotation experiment can set limits on the magnetic moment of a
electrically-neutral, dark-matter particle, and the limits increase in
stringency as the candidate-particle mass decreases. Consequently, if we assume
the dark-matter particle to be a thermal relic, our most stringent constraints
emerge at the keV mass scale. We discuss how such an experiment could be
realized and determine the limits on the magnetic moment as a function of mass
which follow given demonstrated experimental capacities.
|
[
{
"created": "Thu, 6 Nov 2008 16:57:15 GMT",
"version": "v1"
}
] |
2010-04-21
|
[
[
"Gardner",
"S.",
""
]
] |
A Faraday rotation experiment can set limits on the magnetic moment of a electrically-neutral, dark-matter particle, and the limits increase in stringency as the candidate-particle mass decreases. Consequently, if we assume the dark-matter particle to be a thermal relic, our most stringent constraints emerge at the keV mass scale. We discuss how such an experiment could be realized and determine the limits on the magnetic moment as a function of mass which follow given demonstrated experimental capacities.
|
2212.06260
|
Carlos Henrique de Lima
|
Carlos Henrique de Lima and Daniel Stolarski
|
Exploring the vacuum structure of gravitationally induced neutrino
masses
|
references added. version accepted for publication in Phys. Rev. D
| null |
10.1103/PhysRevD.107.075035
| null |
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
In this work, we explore the proposed mechanism in which the gravitational
$\theta$ anomaly generates neutrino masses. We highlight that the leading
renormalizable interactions of the neutrino condensate forbid the possibility
of generating hierarchical masses consistent with observation. This conclusion
still holds when Standard Model loop corrections are accounted for. We show
that higher-dimensional operators can alleviate this problem. The
higher-dimensional operators could be generated from the gravitational anomaly
itself, but there is no clear way to know without a deeper understanding of the
low-energy description of this mechanism. Because of that, we explore the
possibility of new particles generating neutrino mass splittings. We show that
both new particles that alter the scalar potential of the condensate or new
particles in loops for the neutrino self-energy can solve this problem.
|
[
{
"created": "Mon, 12 Dec 2022 21:56:59 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Jan 2023 22:29:59 GMT",
"version": "v2"
},
{
"created": "Mon, 10 Apr 2023 18:55:55 GMT",
"version": "v3"
}
] |
2023-05-10
|
[
[
"de Lima",
"Carlos Henrique",
""
],
[
"Stolarski",
"Daniel",
""
]
] |
In this work, we explore the proposed mechanism in which the gravitational $\theta$ anomaly generates neutrino masses. We highlight that the leading renormalizable interactions of the neutrino condensate forbid the possibility of generating hierarchical masses consistent with observation. This conclusion still holds when Standard Model loop corrections are accounted for. We show that higher-dimensional operators can alleviate this problem. The higher-dimensional operators could be generated from the gravitational anomaly itself, but there is no clear way to know without a deeper understanding of the low-energy description of this mechanism. Because of that, we explore the possibility of new particles generating neutrino mass splittings. We show that both new particles that alter the scalar potential of the condensate or new particles in loops for the neutrino self-energy can solve this problem.
|
hep-ph/0103126
|
Hong-Jian He
|
Duane A. Dicus (1), Hong-Jian He (1), John N. Ng (2) ((1) University
of Texas at Austin, (2) TRIUMF and NCTS)
|
Neutrino-Lepton Masses, Zee Scalars and Muon g-2
|
Version for Phys. Rev. Lett. (typos corrected, minor refinements)
|
Phys.Rev.Lett. 87 (2001) 111803
|
10.1103/PhysRevLett.87.111803
|
UT-HEP-01-019
|
hep-ph
| null |
Evidence for neutrino oscillations is pointing to the existence of tiny but
finite neutrino masses. Such masses may be naturally generated via radiative
corrections in models such as the Zee model where a singlet Zee-scalar plays a
key role. We minimally extend the Zee model by including a right-handed singlet
neutrino \nu_R. The radiative Zee-mechanism can be protected by a simple U(1)_X
symmetry involving only the \nu_R and a Zee-scalar. We further construct a
class of models with a single horizontal U(1)_FN (a la Frogatt-Nielsen) such
that the mass patterns of the neutrinos and leptons are naturally explained. We
then analyze the muon anomalous magnetic moment (g-2) and the flavor changing
\mu --> e\gamma decay. The \nu_R interaction in our minimal extension is found
to induce the BNL g-2 anomaly, with a light charged Zee-scalar of mass 100-300
GeV.
|
[
{
"created": "Mon, 12 Mar 2001 21:41:15 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jul 2001 06:00:18 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Dicus",
"Duane A.",
""
],
[
"He",
"Hong-Jian",
""
],
[
"Ng",
"John N.",
""
]
] |
Evidence for neutrino oscillations is pointing to the existence of tiny but finite neutrino masses. Such masses may be naturally generated via radiative corrections in models such as the Zee model where a singlet Zee-scalar plays a key role. We minimally extend the Zee model by including a right-handed singlet neutrino \nu_R. The radiative Zee-mechanism can be protected by a simple U(1)_X symmetry involving only the \nu_R and a Zee-scalar. We further construct a class of models with a single horizontal U(1)_FN (a la Frogatt-Nielsen) such that the mass patterns of the neutrinos and leptons are naturally explained. We then analyze the muon anomalous magnetic moment (g-2) and the flavor changing \mu --> e\gamma decay. The \nu_R interaction in our minimal extension is found to induce the BNL g-2 anomaly, with a light charged Zee-scalar of mass 100-300 GeV.
|
hep-ph/0208018
|
Robert Foot
|
T. L. Yoon and R. Foot
|
Cosmological implications of low scale quark-lepton unification
|
Expanded discussion about g.o.f of 4 neutrino models, about 20 pages
|
Acta Phys.Polon. B34 (2003) 2815-2842
| null | null |
hep-ph
| null |
There is a unique $\hbox{SU(4)}\otimes\hbox{SU(2)}_L \otimes \hbox{SU(2)}_R$
gauge model which allows quarks and leptons to be unified at the TeV scale --
thereby making the model testable and avoiding the gauge hierarchy problem. In
its minimal form, this model could quite naturally accommodate simultaneous
solutions to the solar and LSND neutrino oscillation data. The atmospheric
neutrino anomaly can be easily accommodated by mirror-symmetrising the minimal
model. The model also contains three right-handed neutrinos, with masses in the
range 1 keV to $\sim$ 1 GeV. We investigate the implications of these
right-handed neutrinos for early Universe cosmology. It is shown that the
minimal model is inconsistent with some of the standard assumptions of the big
bang model. This motivates an examination of non-standard big bang cosmology,
such as a low reheating temperature scenario with $T_{RH} \sim$ MeV. In such a
Universe, peaceful co-existence between low-scale quark-lepton gauge
unification and early Universe cosmology is possible.
|
[
{
"created": "Fri, 2 Aug 2002 06:11:45 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Oct 2002 06:18:37 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Yoon",
"T. L.",
""
],
[
"Foot",
"R.",
""
]
] |
There is a unique $\hbox{SU(4)}\otimes\hbox{SU(2)}_L \otimes \hbox{SU(2)}_R$ gauge model which allows quarks and leptons to be unified at the TeV scale -- thereby making the model testable and avoiding the gauge hierarchy problem. In its minimal form, this model could quite naturally accommodate simultaneous solutions to the solar and LSND neutrino oscillation data. The atmospheric neutrino anomaly can be easily accommodated by mirror-symmetrising the minimal model. The model also contains three right-handed neutrinos, with masses in the range 1 keV to $\sim$ 1 GeV. We investigate the implications of these right-handed neutrinos for early Universe cosmology. It is shown that the minimal model is inconsistent with some of the standard assumptions of the big bang model. This motivates an examination of non-standard big bang cosmology, such as a low reheating temperature scenario with $T_{RH} \sim$ MeV. In such a Universe, peaceful co-existence between low-scale quark-lepton gauge unification and early Universe cosmology is possible.
|
hep-ph/0504090
|
Abdelhak Djouadi
|
Abdelhak Djouadi, Manuel Drees and Jean-Loic Kneur
|
Neutralino Dark Matter in mSUGRA: reopening the light Higgs pole window
|
16 pages, latex, 4 eps figures; v2: references added
|
Phys.Lett. B624 (2005) 60-69
|
10.1016/j.physletb.2005.08.010
|
LPT-Orsay-05-25
|
hep-ph astro-ph
| null |
The requirement that the lightest neutralino $\tilde\chi_1^0$ has the right
thermal relic density to explain all Dark Matter in the universe strongly
constrains the parameter space of supersymmetric models in general, and of the
mSUGRA model in particular. Recently improved calculations of the mass of the
light CP-even Higgs boson $h$ present in this model, and the increased central
value of the mass of the top quark, have re--opened the possibility that $2
\mlsp \lsim m_h$. In this ``$h-$pole region'' the LSP annihilation cross
section is enhanced by near-resonant $h$ exchange in the $s-$channel, reducing
the relic density to acceptable values. We delineate the corresponding region
of mSUGRA parameter space, and explore its phenomenology. In particular, we
find strong upper bounds on the masses of the gluino, lighter chargino and LSP.
|
[
{
"created": "Tue, 12 Apr 2005 17:19:14 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Apr 2005 15:09:28 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Djouadi",
"Abdelhak",
""
],
[
"Drees",
"Manuel",
""
],
[
"Kneur",
"Jean-Loic",
""
]
] |
The requirement that the lightest neutralino $\tilde\chi_1^0$ has the right thermal relic density to explain all Dark Matter in the universe strongly constrains the parameter space of supersymmetric models in general, and of the mSUGRA model in particular. Recently improved calculations of the mass of the light CP-even Higgs boson $h$ present in this model, and the increased central value of the mass of the top quark, have re--opened the possibility that $2 \mlsp \lsim m_h$. In this ``$h-$pole region'' the LSP annihilation cross section is enhanced by near-resonant $h$ exchange in the $s-$channel, reducing the relic density to acceptable values. We delineate the corresponding region of mSUGRA parameter space, and explore its phenomenology. In particular, we find strong upper bounds on the masses of the gluino, lighter chargino and LSP.
|
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