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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0811.2839 | Yoshio Koide | Yoshio Koide and Hiroyuki Nishiura | Maximal CP Violation Hypothesis and a Lepton Mixing Matrix | 10 pages, 4 figure, version in Phys.Rev.D | Phys.Rev.D79:093005,2009 | 10.1103/PhysRevD.79.093005 | OU-HET 629/2009 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Maximal CP violation hypothesis is applied to a simple lepton mixing matrix
form U=V_{CKM}^\dagger U_{TB}, which has recently been speculated under an
ansatz that U becomes an exact tribimaximal mixing U_{TB} in a limit of the
quark mixing matrix V_{CKM} \to {\bf 1}. The prediction \tan^2 \theta_{12} =1/2
in the case of the exact tribimaximal mixing U=U_{TB} is onsiderably spoiled in
the speculated mixing U=V_{CKM}^\dagger U_{TB}. However, the application of the
hypothesis to the lepton sector can again recover the spoiled value to \tan^2
\theta_{12} \simeq 1/2 if the original Kobayashi-Maskawa phase convention for
V_{CKM} is adopted.
| [
{
"created": "Tue, 18 Nov 2008 05:41:59 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Nov 2008 05:59:44 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Apr 2009 09:30:35 GMT",
"version": "v3"
}
] | 2010-04-28 | [
[
"Koide",
"Yoshio",
""
],
[
"Nishiura",
"Hiroyuki",
""
]
] | Maximal CP violation hypothesis is applied to a simple lepton mixing matrix form U=V_{CKM}^\dagger U_{TB}, which has recently been speculated under an ansatz that U becomes an exact tribimaximal mixing U_{TB} in a limit of the quark mixing matrix V_{CKM} \to {\bf 1}. The prediction \tan^2 \theta_{12} =1/2 in the case of the exact tribimaximal mixing U=U_{TB} is onsiderably spoiled in the speculated mixing U=V_{CKM}^\dagger U_{TB}. However, the application of the hypothesis to the lepton sector can again recover the spoiled value to \tan^2 \theta_{12} \simeq 1/2 if the original Kobayashi-Maskawa phase convention for V_{CKM} is adopted. |
hep-ph/9507337 | V. Belyaev | V. M. Belyaev and A. V. Radyushkin | Quark-Hadron Duality and $\gamma^* p \to \Delta$ Form Factors | 15 pages, LaTeX + 4 PS-figures enclosed in one uuencoded, compressed
file | Phys.Lett.B359:194-200,1995 | 10.1016/0370-2693(95)01048-U | CEBAF-TH-95-11 | hep-ph | null | We use local quark-hadron duality to estimate the purely nonperturbative soft
contribution to the $\gamma^*p\to \Delta$ form factors. Our results are in
agreement with existing experimental data. We predict that the ratio
$G_E^*(Q^2)/G_M^*(Q^2)$ is small for all accessible $Q^2$, in contrast to the
pQCD expectations that $G_E^*(Q^2)\to -G_M^*(Q^2)$.
| [
{
"created": "Tue, 18 Jul 1995 23:42:40 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Belyaev",
"V. M.",
""
],
[
"Radyushkin",
"A. V.",
""
]
] | We use local quark-hadron duality to estimate the purely nonperturbative soft contribution to the $\gamma^*p\to \Delta$ form factors. Our results are in agreement with existing experimental data. We predict that the ratio $G_E^*(Q^2)/G_M^*(Q^2)$ is small for all accessible $Q^2$, in contrast to the pQCD expectations that $G_E^*(Q^2)\to -G_M^*(Q^2)$. |
1008.4345 | Ian Clo\"et | Ian C. Cloet and Gerald A. Miller | Third Zemach Moment of the Proton | 3 pages, three figures | Phys.Rev.C83:012201,2011 | 10.1103/PhysRevC.83.012201 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Modern electron scattering experiments have determined the proton electric
form factor, G_{Ep}(Q^2), to high precision. We utilize this data, represented
by the different form factor parametrizations, to compute the third Zemach
moment of the proton charge distribution. We find that existing data rule out a
value of the third Zemach moment large enough to explain the current puzzle
with the proton charge radius determined from the Lamb shift in muonic
hydrogen. This is in contrast with the recent claim of De Rujula
[arXiv:1008.3861].
| [
{
"created": "Wed, 25 Aug 2010 19:29:22 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Aug 2010 16:30:23 GMT",
"version": "v2"
},
{
"created": "Thu, 9 Sep 2010 00:06:55 GMT",
"version": "v3"
}
] | 2011-02-28 | [
[
"Cloet",
"Ian C.",
""
],
[
"Miller",
"Gerald A.",
""
]
] | Modern electron scattering experiments have determined the proton electric form factor, G_{Ep}(Q^2), to high precision. We utilize this data, represented by the different form factor parametrizations, to compute the third Zemach moment of the proton charge distribution. We find that existing data rule out a value of the third Zemach moment large enough to explain the current puzzle with the proton charge radius determined from the Lamb shift in muonic hydrogen. This is in contrast with the recent claim of De Rujula [arXiv:1008.3861]. |
1611.04297 | Bernard Pire | B. Pire, K. Semenov-Tian-Shansky, L. Szymanowski | Baryon-to-meson transition distribution amplitudes: formalism and models | 8 pages, to be published in the proceedings of the the Light Cone
2016 Conference, Lisbon, Portugal, September 5 - 8, 2016 | null | 10.1007/s00601-017-1244-z | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In specific kinematics, hard exclusive amplitudes may be factorized into a
short distance dominated part computable in a perturbative way on the one hand,
and universal, confinement related hadronic matrix elements on the other hand.
The extension of this description to processes such as backward meson
electroproduction and forward meson production in antiproton-nucleon scattering
leads to define new hadronic matrix elements of three quark operators on the
light cone, the nucleon-to-meson transition distribution amplitudes, which shed
a new light on the nucleon structure.
| [
{
"created": "Mon, 14 Nov 2016 09:39:17 GMT",
"version": "v1"
}
] | 2017-03-08 | [
[
"Pire",
"B.",
""
],
[
"Semenov-Tian-Shansky",
"K.",
""
],
[
"Szymanowski",
"L.",
""
]
] | In specific kinematics, hard exclusive amplitudes may be factorized into a short distance dominated part computable in a perturbative way on the one hand, and universal, confinement related hadronic matrix elements on the other hand. The extension of this description to processes such as backward meson electroproduction and forward meson production in antiproton-nucleon scattering leads to define new hadronic matrix elements of three quark operators on the light cone, the nucleon-to-meson transition distribution amplitudes, which shed a new light on the nucleon structure. |
0712.0780 | Arlene Cristina Aguilar | A. C. Aguilar, J. Papavassiliou | Infrared finite ghost propagator in the Feynman gauge | 22 pages, 9 figures | Phys.Rev.D77:125022,2008 | 10.1103/PhysRevD.77.125022 | null | hep-ph | null | We demonstrate how to obtain from the Schwinger-Dyson equations of QCD an
infrared finite ghost propagator in the Feynman gauge. The key ingredient in
this construction is the longitudinal form factor of the non-perturbative
gluon-ghost vertex, which, contrary to what happens in the Landau gauge,
contributes non-trivially to the gap equation of the ghost. The detailed study
of the corresponding vertex equation reveals that in the presence of a
dynamical infrared cutoff this form factor remains finite in the limit of
vanishing ghost momentum. This, in turn, allows the ghost self-energy to reach
a finite value in the infrared, without having to assume any additional
properties for the gluon-ghost vertex, such as the presence of massless poles.
The implications of this result and possible future directions are briefly
outlined.
| [
{
"created": "Wed, 5 Dec 2007 17:02:19 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Aguilar",
"A. C.",
""
],
[
"Papavassiliou",
"J.",
""
]
] | We demonstrate how to obtain from the Schwinger-Dyson equations of QCD an infrared finite ghost propagator in the Feynman gauge. The key ingredient in this construction is the longitudinal form factor of the non-perturbative gluon-ghost vertex, which, contrary to what happens in the Landau gauge, contributes non-trivially to the gap equation of the ghost. The detailed study of the corresponding vertex equation reveals that in the presence of a dynamical infrared cutoff this form factor remains finite in the limit of vanishing ghost momentum. This, in turn, allows the ghost self-energy to reach a finite value in the infrared, without having to assume any additional properties for the gluon-ghost vertex, such as the presence of massless poles. The implications of this result and possible future directions are briefly outlined. |
hep-ph/0205297 | Dr Rukmani Mohanta | R. Mohanta | Searching for New Physics in the rare decay B^+ \to D_s^+ \phi | LaTex, 12 pages | Phys.Lett.B540:241-246,2002 | 10.1016/S0370-2693(02)02173-1 | null | hep-ph | null | The rare decay $B^+ \to D_s^+ \phi $ can occur only via annihilation type
diagram in the standard model. The small branching ratio predicted in the
standard model makes this channel sensitive to new physics contributions. We
analyze this decay mode, both in the standard model and in several extensions
of it. The models considered are minimal supersymmetric model with R-parity
violation and two Higgs doublet model. The experimental verification of our
findings of large branching ratio and/or nonzero CP asymmetry may signal the
presence of new physics.
| [
{
"created": "Mon, 27 May 2002 03:01:56 GMT",
"version": "v1"
}
] | 2011-03-23 | [
[
"Mohanta",
"R.",
""
]
] | The rare decay $B^+ \to D_s^+ \phi $ can occur only via annihilation type diagram in the standard model. The small branching ratio predicted in the standard model makes this channel sensitive to new physics contributions. We analyze this decay mode, both in the standard model and in several extensions of it. The models considered are minimal supersymmetric model with R-parity violation and two Higgs doublet model. The experimental verification of our findings of large branching ratio and/or nonzero CP asymmetry may signal the presence of new physics. |
hep-ph/0005200 | Berezhnoy Alexander V. | A.V. Berezhnoy, A.K. Likhoded | The contribution of the hadronic component of the photon into the
$D^*$-meson photoproduction at HERA | 12 pages, LATEX file, 5 ps-figures; changed LATEX style; estimated
the model uncertainty | null | null | null | hep-ph | null | In the framework of the vector dominance model (VDM) new contribution into
the cross-section of $D^*$-meson photoproduction at HERA has been estimated.
This contribution is due to the interaction of the virtual vector $c\bar
c$-mesons from photon with the proton. It has been shown that the mechanism
under discussion plays the essential role for all values of transverse momentum
of $D^*$-mesons at HERA. Taking into account for the contribution of this
mechanism improves the description of the experimental cross section
distribution.
| [
{
"created": "Fri, 19 May 2000 11:43:58 GMT",
"version": "v1"
},
{
"created": "Mon, 22 May 2000 14:02:34 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Jun 2000 12:15:34 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Berezhnoy",
"A. V.",
""
],
[
"Likhoded",
"A. K.",
""
]
] | In the framework of the vector dominance model (VDM) new contribution into the cross-section of $D^*$-meson photoproduction at HERA has been estimated. This contribution is due to the interaction of the virtual vector $c\bar c$-mesons from photon with the proton. It has been shown that the mechanism under discussion plays the essential role for all values of transverse momentum of $D^*$-mesons at HERA. Taking into account for the contribution of this mechanism improves the description of the experimental cross section distribution. |
2312.13125 | Joon-Bin Lee | Joon-Bin Lee, M.R. Masouminia, Michael H. Seymour, Un-ki Yang | Generalized angular-order parton showers in Herwig 7 | null | J. High Energ. Phys. 08 (2024) 064 | null | IPPP/23/73, MCnet-23-21 | hep-ph | http://creativecommons.org/publicdomain/zero/1.0/ | This paper presents the inaugural investigation of beyond the Standard Model
(BSM) radiation processes, framed as a generalized, process- and
model-independent parton shower algorithm within Herwig 7, based on direct
translations of Universal FeynRules Output (UFO) constructed via Herwig's
ufo2herwig module. Leveraging the fact that shower kinematics are dictated by
the spins of involved particles, we calculate comprehensive helicity-dependent
branching kernels for all feasible splittings of scalars, fermions, and vector
bosons, tailored to Herwig 7's angular-ordering (AO) parton shower algorithm.
Utilizing these kernels, we derive BSM splitting functions in the
quasi-collinear limit, ensuring compatibility with the Standard Model (SM) and
supersymmetry (SUSY) splitting functions when analogous parameter conditions
are applied. These newly derived functions have been integrated into the Herwig
7 event generator framework. Comparative analyses with fixed-order matrix
element calculations show good agreement for single radiation events. Moreover,
the results showcase the influence of BSM radiation at the Large Hadron
Collider (LHC) and envisage its implications for future collider endeavours.
This research augments our comprehension of BSM radiation effects, with
significant bearings on present and prospective collider-based inquiries.
| [
{
"created": "Wed, 20 Dec 2023 15:44:45 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Aug 2024 22:38:38 GMT",
"version": "v2"
}
] | 2024-08-14 | [
[
"Lee",
"Joon-Bin",
""
],
[
"Masouminia",
"M. R.",
""
],
[
"Seymour",
"Michael H.",
""
],
[
"Yang",
"Un-ki",
""
]
] | This paper presents the inaugural investigation of beyond the Standard Model (BSM) radiation processes, framed as a generalized, process- and model-independent parton shower algorithm within Herwig 7, based on direct translations of Universal FeynRules Output (UFO) constructed via Herwig's ufo2herwig module. Leveraging the fact that shower kinematics are dictated by the spins of involved particles, we calculate comprehensive helicity-dependent branching kernels for all feasible splittings of scalars, fermions, and vector bosons, tailored to Herwig 7's angular-ordering (AO) parton shower algorithm. Utilizing these kernels, we derive BSM splitting functions in the quasi-collinear limit, ensuring compatibility with the Standard Model (SM) and supersymmetry (SUSY) splitting functions when analogous parameter conditions are applied. These newly derived functions have been integrated into the Herwig 7 event generator framework. Comparative analyses with fixed-order matrix element calculations show good agreement for single radiation events. Moreover, the results showcase the influence of BSM radiation at the Large Hadron Collider (LHC) and envisage its implications for future collider endeavours. This research augments our comprehension of BSM radiation effects, with significant bearings on present and prospective collider-based inquiries. |
1401.0276 | Sabine Hossenfelder | Sabine Hossenfelder | Theory and Phenomenology of Spacetime Defects | Summary of arXiv:1309.0311 and arXiv:1309.0314. Prepared for the AHEP
Special Issue on "Experimental Tests of Quantum Gravity and Exotic Quantum
Field Theory Effects" | null | 10.1155/2014/950672 | null | hep-ph gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Whether or not space-time is fundamentally discrete is of central importance
for the development of the theory of quantum gravity. If the fundamental
description of space-time is discrete, typically represented in terms of a
graph or network, then the apparent smoothness of geometry on large scales
should be imperfect -- it should have defects. Here, we review a model for
space-time defects and summarize the constraints on the prevalence of these
defects that can be derived from observation.
| [
{
"created": "Wed, 1 Jan 2014 11:41:19 GMT",
"version": "v1"
}
] | 2014-03-24 | [
[
"Hossenfelder",
"Sabine",
""
]
] | Whether or not space-time is fundamentally discrete is of central importance for the development of the theory of quantum gravity. If the fundamental description of space-time is discrete, typically represented in terms of a graph or network, then the apparent smoothness of geometry on large scales should be imperfect -- it should have defects. Here, we review a model for space-time defects and summarize the constraints on the prevalence of these defects that can be derived from observation. |
1107.0715 | Marco Farina | Marco Farina, Duccio Pappadopulo, Alessandro Strumia, Tomer Volansky | Can CoGeNT and DAMA Modulations Be Due to Dark Matter? | 30 pages, 14 figures. v2: error corrected, some figures changed,
references added. Final version, to appear on JCAP | null | 10.1088/1475-7516/2011/11/010 | null | hep-ph astro-ph.CO astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the dark matter interpretation of the anomalies claimed by the
DAMA and CoGeNT experiments, in conjunction with the various null
direct-detection experiments. An independent analysis of the CoGeNT data is
employed and several experimental and astrophysical uncertainties are
considered. Various phenomenological models are studied, including isospin
violating interactions, momentum-dependent form factors, velocity-dependent
form factors, inelastic scatterings (endothermic and exothermic) and
channeling. We find that the severe tension between the anomalies and the null
results can be ameliorated but not eliminated, unless extreme assumptions are
made.
| [
{
"created": "Mon, 4 Jul 2011 19:55:34 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Oct 2011 14:10:00 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Farina",
"Marco",
""
],
[
"Pappadopulo",
"Duccio",
""
],
[
"Strumia",
"Alessandro",
""
],
[
"Volansky",
"Tomer",
""
]
] | We explore the dark matter interpretation of the anomalies claimed by the DAMA and CoGeNT experiments, in conjunction with the various null direct-detection experiments. An independent analysis of the CoGeNT data is employed and several experimental and astrophysical uncertainties are considered. Various phenomenological models are studied, including isospin violating interactions, momentum-dependent form factors, velocity-dependent form factors, inelastic scatterings (endothermic and exothermic) and channeling. We find that the severe tension between the anomalies and the null results can be ameliorated but not eliminated, unless extreme assumptions are made. |
1311.2072 | Juan Gonzalez-Fraile | C\'edric Delaunay, Thomas Flacke, J. Gonzalez-Fraile, Seung J. Lee,
Giuliano Panico, Gilad Perez | Light Non-degenerate Composite Partners at the LHC | 49 pages, 18 figures | null | 10.1007/JHEP02(2014)055 | CERN-PH-TH/2013-259, LAPTh-064/13 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the implications of a large degree of compositeness for the light
generation quarks in composite pseudo-Nambu-Goldstone-boson Higgs models. We
focus in particular on viable scenarios where the right-handed up-type quarks
have a sizable mixing with the strong dynamics. For concreteness we assume the
latter to be characterized by an SO(5)/SO(4) symmetry with fermionic resonances
in the SO(4) singlet and fourplet representations. Singlet partners dominantly
decay to a Higgs boson and jets. As no dedicated searches are currently looking
for these final states, singlet partners can still be rather light. Conversely,
some fourplet partners dominantly decay to an electroweak gauge boson and a
jet, a signature which has been analyzed at the LHC. To constrain the parameter
space of this scenario we have reinterpreted various LHC analyses. In the limit
of first two generation degeneracy, as in minimal flavor violation or
U(2)-symmetric flavor models, fourplet partners need to be relatively heavy,
with masses above 1.8 TeV, or the level of compositeness needs to be rather
small. The situation is rather different in models that deviate from the first
two generation degeneracy paradigm, as the charm parton distribution functions
are suppressed relative to the up quark ones. The right-handed charm quark can
be composite and its partners being as light as 600 GeV, while the right-handed
up quark needs either to be mostly elementary or to have its partners as heavy
as 2 TeV. Models with fully composite singlet fermions are also analyzed,
leading to similar conclusions. Finally, we consider the case where both the
fourplet and the singlet states are present. In this case the bounds could be
significantly weaken due to a combination of smaller production rates and the
opening of new channels including cascade processes.
| [
{
"created": "Fri, 8 Nov 2013 21:00:01 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Delaunay",
"Cédric",
""
],
[
"Flacke",
"Thomas",
""
],
[
"Gonzalez-Fraile",
"J.",
""
],
[
"Lee",
"Seung J.",
""
],
[
"Panico",
"Giuliano",
""
],
[
"Perez",
"Gilad",
""
]
] | We study the implications of a large degree of compositeness for the light generation quarks in composite pseudo-Nambu-Goldstone-boson Higgs models. We focus in particular on viable scenarios where the right-handed up-type quarks have a sizable mixing with the strong dynamics. For concreteness we assume the latter to be characterized by an SO(5)/SO(4) symmetry with fermionic resonances in the SO(4) singlet and fourplet representations. Singlet partners dominantly decay to a Higgs boson and jets. As no dedicated searches are currently looking for these final states, singlet partners can still be rather light. Conversely, some fourplet partners dominantly decay to an electroweak gauge boson and a jet, a signature which has been analyzed at the LHC. To constrain the parameter space of this scenario we have reinterpreted various LHC analyses. In the limit of first two generation degeneracy, as in minimal flavor violation or U(2)-symmetric flavor models, fourplet partners need to be relatively heavy, with masses above 1.8 TeV, or the level of compositeness needs to be rather small. The situation is rather different in models that deviate from the first two generation degeneracy paradigm, as the charm parton distribution functions are suppressed relative to the up quark ones. The right-handed charm quark can be composite and its partners being as light as 600 GeV, while the right-handed up quark needs either to be mostly elementary or to have its partners as heavy as 2 TeV. Models with fully composite singlet fermions are also analyzed, leading to similar conclusions. Finally, we consider the case where both the fourplet and the singlet states are present. In this case the bounds could be significantly weaken due to a combination of smaller production rates and the opening of new channels including cascade processes. |
2001.02961 | Zhi-Gang Wang | Zhi-Gang Wang | Analysis of the $\Omega_b(6316)$, $\Omega_b(6330)$, $\Omega_b(6340)$ and
$\Omega_b(6350)$ with QCD sum rules | 9 pages, 4 figures | Int. J. Mod. Phys. A35 (2020) 2050043 | 10.1142/S0217751X20500438 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we introduce an explicit P-wave to construct three-quark
currents to study the P-wave $\Omega_b$ states with the full QCD sum rules. The
predicted masses have a hierarchy if the same parameters are chosen and favor
assigning the $\Omega_b(6316)$, $\Omega_b(6330)$, $\Omega_b(6340)$ and
$\Omega_b(6350)$ to be the P-wave $\Omega_b$ states with the
$J^P={\frac{3}{2}}^-$, ${\frac{1}{2}}^-$, ${\frac{5}{2}}^-$ and
${\frac{3}{2}}^-$, respectively.
| [
{
"created": "Thu, 9 Jan 2020 13:15:34 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Mar 2020 07:24:27 GMT",
"version": "v2"
}
] | 2020-04-15 | [
[
"Wang",
"Zhi-Gang",
""
]
] | In this article, we introduce an explicit P-wave to construct three-quark currents to study the P-wave $\Omega_b$ states with the full QCD sum rules. The predicted masses have a hierarchy if the same parameters are chosen and favor assigning the $\Omega_b(6316)$, $\Omega_b(6330)$, $\Omega_b(6340)$ and $\Omega_b(6350)$ to be the P-wave $\Omega_b$ states with the $J^P={\frac{3}{2}}^-$, ${\frac{1}{2}}^-$, ${\frac{5}{2}}^-$ and ${\frac{3}{2}}^-$, respectively. |
1108.2694 | Ricardo Gonzalez Felipe | R. Gonzalez Felipe | Neutrinos and the matter-antimatter asymmetry in the Universe | 8 pages, 1 table, 1 figure; Based on talk given at the Symposium
STARS2011, 1 - 4 May 2011, Havana, Cuba; to be published in the Proceedings | null | 10.1142/S0218301311040074 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The discovery of neutrino oscillations provides a solid evidence for nonzero
neutrino masses and leptonic mixing. The fact that neutrino masses are so tiny
constitutes a puzzling problem in particle physics. From the theoretical
viewpoint, the smallness of neutrino masses can be elegantly explained through
the seesaw mechanism. Another challenging issue for particle physics and
cosmology is the explanation of the matter-antimatter asymmetry observed in
Nature. Among the viable mechanisms, leptogenesis is a simple and
well-motivated framework. In this talk we briefly review these aspects, making
emphasis on the possibility of linking neutrino physics to the cosmological
baryon asymmetry originated from leptogenesis.
| [
{
"created": "Fri, 12 Aug 2011 19:38:17 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Felipe",
"R. Gonzalez",
""
]
] | The discovery of neutrino oscillations provides a solid evidence for nonzero neutrino masses and leptonic mixing. The fact that neutrino masses are so tiny constitutes a puzzling problem in particle physics. From the theoretical viewpoint, the smallness of neutrino masses can be elegantly explained through the seesaw mechanism. Another challenging issue for particle physics and cosmology is the explanation of the matter-antimatter asymmetry observed in Nature. Among the viable mechanisms, leptogenesis is a simple and well-motivated framework. In this talk we briefly review these aspects, making emphasis on the possibility of linking neutrino physics to the cosmological baryon asymmetry originated from leptogenesis. |
hep-ph/9806525 | Tetsuya Shiromizu | Tetsuya Shiromizu | Generation of Magnetic Field due to Excited Q-Balls | 6 pages, LaTex, to appear in Phys.Rev.D | Phys.Rev. D58 (1998) 107301 | 10.1103/PhysRevD.58.107301 | DAMTP/R/98/25, UTAP-192 | hep-ph astro-ph | null | We investigate phase transitions due to excited Q-balls. As excited Q-balls
have angular momentum, a magnetic field can be generated if one considers
gauged Q-balls. Based on the course of the phase transition we estimate the
strength of the magnetic field and then we find that it might be the origin of
observed magnetic fields of astrophysical objects such as galaxies and clusters
of galaxies.
| [
{
"created": "Tue, 30 Jun 1998 09:48:57 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Shiromizu",
"Tetsuya",
""
]
] | We investigate phase transitions due to excited Q-balls. As excited Q-balls have angular momentum, a magnetic field can be generated if one considers gauged Q-balls. Based on the course of the phase transition we estimate the strength of the magnetic field and then we find that it might be the origin of observed magnetic fields of astrophysical objects such as galaxies and clusters of galaxies. |
hep-ph/9805412 | null | Hongying Jin and X.M. Zhang | Scalar Glueball Decay Into Pions In Effective Theory | 10 pages, latex, 3 ps figures | null | null | null | hep-ph | null | We examine the mixing between the sigma meson $\sigma$ and the "pure"
glueball field $H$ and study the decays of the scalar glueball candidate
$f_0(1500)$ (a linear combination of $\sigma$ and $H$) into two and four pions
in effective linear sigma model. From recent experimental data on $f_0(1500)$
decay to pions we point out that the mixing angle is of order of 0.1.
| [
{
"created": "Thu, 21 May 1998 14:44:38 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Jin",
"Hongying",
""
],
[
"Zhang",
"X. M.",
""
]
] | We examine the mixing between the sigma meson $\sigma$ and the "pure" glueball field $H$ and study the decays of the scalar glueball candidate $f_0(1500)$ (a linear combination of $\sigma$ and $H$) into two and four pions in effective linear sigma model. From recent experimental data on $f_0(1500)$ decay to pions we point out that the mixing angle is of order of 0.1. |
1206.5701 | K. S. Babu | K. S. Babu and R. N. Mohapatra | Coupling Unification, GUT-Scale Baryogenesis and Neutron-Antineutron
Oscillation in SO(10) | 15 pages, 4 eps figures, references added, to appear in Phys. Lett. B | null | 10.1016/j.physletb.2012.08.006 | OSU-HEP-12-06; UMD-PP-012-009 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that unification of the three gauge couplings can be realized
consistently in a class of non-supersymmetric SO(10) models with a one-step
breaking to the Standard Model if a color-sextet scalar field survives down to
the TeV scale. Such scalars, which should be accessible to the LHC for direct
detection, arise naturally in SO(10) as remnants of the seesaw mechanism for
neutrino masses. The diquark couplings of these scalars lead to \Delta B = 2
baryon number violating processes such as neutron-antineutron oscillation. We
estimate the free neutron-antineutron transition time to be \tau_{n-\bar{n}}
\approx (10^9-10^{12}) sec., which is in the interesting range for next
generation n-\bar{n} oscillation experiments. These models also realize
naturally the recently proposed (B-L)-violating GUT scale baryogenesis which
survives to low temperatures unaffected by the electroweak sphaleron
interactions.
| [
{
"created": "Mon, 25 Jun 2012 15:07:21 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Aug 2012 18:32:46 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Babu",
"K. S.",
""
],
[
"Mohapatra",
"R. N.",
""
]
] | We show that unification of the three gauge couplings can be realized consistently in a class of non-supersymmetric SO(10) models with a one-step breaking to the Standard Model if a color-sextet scalar field survives down to the TeV scale. Such scalars, which should be accessible to the LHC for direct detection, arise naturally in SO(10) as remnants of the seesaw mechanism for neutrino masses. The diquark couplings of these scalars lead to \Delta B = 2 baryon number violating processes such as neutron-antineutron oscillation. We estimate the free neutron-antineutron transition time to be \tau_{n-\bar{n}} \approx (10^9-10^{12}) sec., which is in the interesting range for next generation n-\bar{n} oscillation experiments. These models also realize naturally the recently proposed (B-L)-violating GUT scale baryogenesis which survives to low temperatures unaffected by the electroweak sphaleron interactions. |
1808.09014 | Nikolaos Kidonakis | Matthew Forslund and Nikolaos Kidonakis | Associated production of a top quark with a photon via anomalous
couplings | 11 pages, 6 figures; published version | Phys. Rev. D 98, 074017 (2018) | 10.1103/PhysRevD.98.074017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the associated production of a top quark with a photon via
anomalous $t$-$q$-$\gamma$ couplings, and present higher-order corrections from
soft-gluon emission for the processes $gq \rightarrow t\gamma$ at LHC energies.
We perform soft-gluon resummation at next-to-leading-logarithm accuracy and
derive approximate next-to-next-to-leading order (aNNLO) double-differential
cross sections. We calculate at aNNLO the total $t\gamma$ production cross
sections and the top-quark transverse-momentum and rapidity distributions for
various LHC energies, and show that the soft-gluon corrections are large and
dominant in these processes.
| [
{
"created": "Mon, 27 Aug 2018 19:48:49 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Oct 2018 19:39:55 GMT",
"version": "v2"
}
] | 2018-10-24 | [
[
"Forslund",
"Matthew",
""
],
[
"Kidonakis",
"Nikolaos",
""
]
] | We discuss the associated production of a top quark with a photon via anomalous $t$-$q$-$\gamma$ couplings, and present higher-order corrections from soft-gluon emission for the processes $gq \rightarrow t\gamma$ at LHC energies. We perform soft-gluon resummation at next-to-leading-logarithm accuracy and derive approximate next-to-next-to-leading order (aNNLO) double-differential cross sections. We calculate at aNNLO the total $t\gamma$ production cross sections and the top-quark transverse-momentum and rapidity distributions for various LHC energies, and show that the soft-gluon corrections are large and dominant in these processes. |
1512.05731 | Tuhin Subhra Mukherjee | Shrihari Gopalakrishna, Tuhin Subhra Mukherjee, Soumya Sadhukhan | Status and Prospects of the Two-Higgs-Doublet SU(6)/Sp(6) little-Higgs
Model and the Alignment Limit | 21 pages, 11 figures, Comments added | Phys. Rev. D 94, 015034 (2016) | 10.1103/PhysRevD.94.015034 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study in detail the little-Higgs model proposed by Low, Skiba and Smith
with an SU(6)/Sp(6) group structure. The effective theory at the TeV scale is a
two-Higgs doublet model (2HDM) with additional heavy vector-like fermions and
vector-bosons. We identify a set of independent input parameters and develop
expressions for masses and couplings in terms of these. We perform a random
scan of the parameter space and find points that satisfy constraints, including
the recent 8 TeV LHC Higgs measurements, namely, the Higgs mass, Higgs
couplings to the top, bottom, $\tau$, $W^\pm$ and $Z$, top-quark mass, and
collider bounds on colored vector-like fermions ($t'$ and $b'$), and also
precision electroweak constraints. The LHC constraints on the $hWW$ and $hZZ$
couplings are satisfied by being close to the "alignment limit". We find how
fine-tuned the model is after including these constraints. For the points that
satisfy the constraints, we present the 1-loop effective couplings of the
CP-even and CP-odd neutral scalars to two gluons including contributions of
standard model and heavy vector-like quarks. We also present the branching
ratios of the heavy neutral scalars into the $\gamma\gamma,\, \tau\bar\tau,\,
b\bar b,\, t\bar t, WW, ZZ, Zh, hh$ modes, and the heavy charged scalar into
$tb,\, \tau\nu, cs, W h$ modes. These will aid searches of the heavy scalars at
the LHC and other future colliders.
| [
{
"created": "Thu, 17 Dec 2015 19:29:49 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Aug 2016 21:41:41 GMT",
"version": "v2"
}
] | 2016-08-03 | [
[
"Gopalakrishna",
"Shrihari",
""
],
[
"Mukherjee",
"Tuhin Subhra",
""
],
[
"Sadhukhan",
"Soumya",
""
]
] | We study in detail the little-Higgs model proposed by Low, Skiba and Smith with an SU(6)/Sp(6) group structure. The effective theory at the TeV scale is a two-Higgs doublet model (2HDM) with additional heavy vector-like fermions and vector-bosons. We identify a set of independent input parameters and develop expressions for masses and couplings in terms of these. We perform a random scan of the parameter space and find points that satisfy constraints, including the recent 8 TeV LHC Higgs measurements, namely, the Higgs mass, Higgs couplings to the top, bottom, $\tau$, $W^\pm$ and $Z$, top-quark mass, and collider bounds on colored vector-like fermions ($t'$ and $b'$), and also precision electroweak constraints. The LHC constraints on the $hWW$ and $hZZ$ couplings are satisfied by being close to the "alignment limit". We find how fine-tuned the model is after including these constraints. For the points that satisfy the constraints, we present the 1-loop effective couplings of the CP-even and CP-odd neutral scalars to two gluons including contributions of standard model and heavy vector-like quarks. We also present the branching ratios of the heavy neutral scalars into the $\gamma\gamma,\, \tau\bar\tau,\, b\bar b,\, t\bar t, WW, ZZ, Zh, hh$ modes, and the heavy charged scalar into $tb,\, \tau\nu, cs, W h$ modes. These will aid searches of the heavy scalars at the LHC and other future colliders. |
1611.05270 | Cem Salih Un | Ali Cici, Zerrin Kirca and Cem Salih Un | Light Stops and Fine-Tuning in MSSM | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the fine-tuning issue within the MSSM framework. Following the
idea that the fine-tuning can measure effects of some missing mechanism, we
impose non-universal gaugino masses at the GUT scalem and explore the low scale
implications. We realize that the fine-tuning parametrized with Delta_EW can be
as low as zero. We consider the stop mass with a special importance and focus
on the mass scales as m_stop <=700 GeV, which are excluded by current
experiments when the stop decays into a neutralino along with a top quark or a
chargino along with a b quark. We find that the stop mass can be as low as
about 200 GeV with Delta_EW ~ 50. We find that the solutions in this region can
be exluded only up to 60% when stop decays into a neutralino-top quark, and 50%
when it decays into a chargino-b quark pair. Setting 65% CL to be potential
exclusion and 95% to be pure exclusion limit such solutions will be tested in
near future experiments, which are conducted with higher luminosity. In
addition to stop, the region with low fine-tuning and light stops predicts
masses for the other supersymmetric particles such as m_sbottom >~ 600 GeV,
m_stau >~ 1 TeV, m_chargino >~ 120 GeV. The details for the mass scales and
decay rates are also provided by tables of benchmark points.
| [
{
"created": "Wed, 16 Nov 2016 13:33:10 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Nov 2016 13:22:18 GMT",
"version": "v2"
},
{
"created": "Mon, 31 Jul 2017 19:05:55 GMT",
"version": "v3"
}
] | 2017-08-02 | [
[
"Cici",
"Ali",
""
],
[
"Kirca",
"Zerrin",
""
],
[
"Un",
"Cem Salih",
""
]
] | We discuss the fine-tuning issue within the MSSM framework. Following the idea that the fine-tuning can measure effects of some missing mechanism, we impose non-universal gaugino masses at the GUT scalem and explore the low scale implications. We realize that the fine-tuning parametrized with Delta_EW can be as low as zero. We consider the stop mass with a special importance and focus on the mass scales as m_stop <=700 GeV, which are excluded by current experiments when the stop decays into a neutralino along with a top quark or a chargino along with a b quark. We find that the stop mass can be as low as about 200 GeV with Delta_EW ~ 50. We find that the solutions in this region can be exluded only up to 60% when stop decays into a neutralino-top quark, and 50% when it decays into a chargino-b quark pair. Setting 65% CL to be potential exclusion and 95% to be pure exclusion limit such solutions will be tested in near future experiments, which are conducted with higher luminosity. In addition to stop, the region with low fine-tuning and light stops predicts masses for the other supersymmetric particles such as m_sbottom >~ 600 GeV, m_stau >~ 1 TeV, m_chargino >~ 120 GeV. The details for the mass scales and decay rates are also provided by tables of benchmark points. |
hep-ph/0109275 | Francesco Villante | G. Fiorentini, F.L. Villante and B. Ricci | A few comments after the charged current measurement at the Sudbury
Neutrino Observatory | 13 pages, 2 figures. Based on the talks given by G.Fiorentini and
F.L.Villante at the NO-VE Workshop, Venice, Italy, 24-26 July 2001. To be
published in the proceedings | null | null | null | hep-ph astro-ph | null | The comparison of the SNO charged current result with the solar neutrino
signal measured by Super-Kamiokande has provided, for the first time, the
evidence of a non electron flavour active neutrino component in the solar flux.
We remark here that this evidence can be obtained in a model independent way,
i.e. without any assumpion about solar models, about the energy dependence of
the neutrino oscillation probability and about the presence of sterile
neutrinos. Furthermore, from the 8B neutrino flux obtained by combining SNO and
Super-Kamiokande, one can determine the central solar temperature, T = 1.57 (1
\pm 1%) 10^7 K, and provide an estimate of the beryllium neutrino flux, Phi_Be
= 4.9 (1 \pm 11%) 10^9 cm^{-2} s^{-1}.
| [
{
"created": "Fri, 28 Sep 2001 18:33:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Fiorentini",
"G.",
""
],
[
"Villante",
"F. L.",
""
],
[
"Ricci",
"B.",
""
]
] | The comparison of the SNO charged current result with the solar neutrino signal measured by Super-Kamiokande has provided, for the first time, the evidence of a non electron flavour active neutrino component in the solar flux. We remark here that this evidence can be obtained in a model independent way, i.e. without any assumpion about solar models, about the energy dependence of the neutrino oscillation probability and about the presence of sterile neutrinos. Furthermore, from the 8B neutrino flux obtained by combining SNO and Super-Kamiokande, one can determine the central solar temperature, T = 1.57 (1 \pm 1%) 10^7 K, and provide an estimate of the beryllium neutrino flux, Phi_Be = 4.9 (1 \pm 11%) 10^9 cm^{-2} s^{-1}. |
1511.09461 | Giuseppe Ruoso | Giuseppe Ruoso, Augusto Lombardi, Antonello Ortolan, Ruggero Pengo,
Caterina Braggio, Giovanni Carugno, Carmelo Sebastiano Gallo, Clive C. Speake | The QUAX proposal: a search of galactic axion with magnetic materials | 5 pages, Contribution for the proceedings of the TAUP2015,
International Conference on Topics in Astroparticle and Underground Physics,
7-11 September 2015, Torino, Italy | null | 10.1088/1742-6596/718/4/042051 | null | hep-ph physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Aim of the QUAX (QUaerere AXion) proposal is to exploit the interaction of
cosmological axions with the spin of electrons in a magnetized sample. Their
effect is equivalent to the application of an oscillating rf field with
frequency and amplitude which are fixed by axion mass and coupling constant,
respectively. The rf receiver module of the QUAX detector consists of
magnetized samples with the Larmor resonance frequency tuned to the axion mass
by a polarizing static magnetic field. The interaction of electrons with the
axion-equivalent rf field produces oscillations in the total magnetization of
the samples. To amplify such a tiny field, a pump field at the same frequency
is applied in a direction orthogonal to the polarizing field. The induced
oscillatory magnetization along the polarizing field is measured by a SQUID
amplifier operated at its quantum noise level.
| [
{
"created": "Mon, 30 Nov 2015 20:38:55 GMT",
"version": "v1"
}
] | 2016-06-22 | [
[
"Ruoso",
"Giuseppe",
""
],
[
"Lombardi",
"Augusto",
""
],
[
"Ortolan",
"Antonello",
""
],
[
"Pengo",
"Ruggero",
""
],
[
"Braggio",
"Caterina",
""
],
[
"Carugno",
"Giovanni",
""
],
[
"Gallo",
"Carmelo Sebastiano... | Aim of the QUAX (QUaerere AXion) proposal is to exploit the interaction of cosmological axions with the spin of electrons in a magnetized sample. Their effect is equivalent to the application of an oscillating rf field with frequency and amplitude which are fixed by axion mass and coupling constant, respectively. The rf receiver module of the QUAX detector consists of magnetized samples with the Larmor resonance frequency tuned to the axion mass by a polarizing static magnetic field. The interaction of electrons with the axion-equivalent rf field produces oscillations in the total magnetization of the samples. To amplify such a tiny field, a pump field at the same frequency is applied in a direction orthogonal to the polarizing field. The induced oscillatory magnetization along the polarizing field is measured by a SQUID amplifier operated at its quantum noise level. |
hep-ph/0408301 | Chris Korthals Altes | C.P. Korthals Altes | Dilute monopole gas, magnetic screening and k-tensions in hot
gluodynamics | 13 pages, talk given at Workshop on Continuous Advances in QCD 2004,
Minneapolis, Minnesota, 13-16 May 2004 | null | 10.1142/9789812702326_0036 | null | hep-ph | null | An adjoint multiplet of screened monopoles forming a dilute gas fits very
well lattice data at high $T$. There are now seven ratios for k-strings
available, checking within a few percent with the prediction $k(N-k)$. The
diluteness turns out to be a small parameter for SU(N) gluodynamics, to a good
approximation ($1\over N^2$) independent of the value of $N$, and also
independent of $T$. This suggests a dilute Bose-Einstein gas, with a BE
transition at the deconfinement temperature $T_c$.
| [
{
"created": "Thu, 26 Aug 2004 13:02:58 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Altes",
"C. P. Korthals",
""
]
] | An adjoint multiplet of screened monopoles forming a dilute gas fits very well lattice data at high $T$. There are now seven ratios for k-strings available, checking within a few percent with the prediction $k(N-k)$. The diluteness turns out to be a small parameter for SU(N) gluodynamics, to a good approximation ($1\over N^2$) independent of the value of $N$, and also independent of $T$. This suggests a dilute Bose-Einstein gas, with a BE transition at the deconfinement temperature $T_c$. |
1510.08738 | Miguel Sanchis | Miguel-Angel Sanchis-Lozano, Edward K. Sarkisyan-Grinbaum and Salvador
Moreno-Picot | Searching for hidden sector in multiparticle production at the LHC | 13 pages, 7 figures | null | 10.1016/j.physletb.2016.01.038 | IFIC/15-83, FTUV-15-1028 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the impact of a hidden sector beyond the Standard Model, e.g. a
Hidden Valley model, on factorial moments and cumulants of multiplicity
distributions in multiparticle production with a special emphasis on the
prospects for LHC results.
| [
{
"created": "Thu, 29 Oct 2015 15:27:54 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jan 2016 16:14:01 GMT",
"version": "v2"
}
] | 2016-01-27 | [
[
"Sanchis-Lozano",
"Miguel-Angel",
""
],
[
"Sarkisyan-Grinbaum",
"Edward K.",
""
],
[
"Moreno-Picot",
"Salvador",
""
]
] | We study the impact of a hidden sector beyond the Standard Model, e.g. a Hidden Valley model, on factorial moments and cumulants of multiplicity distributions in multiparticle production with a special emphasis on the prospects for LHC results. |
hep-ph/9605352 | Thomas G. Rizzo | Thomas G. Rizzo | The Polarization Asymmetry and Triple Gauge Boson Couplings in $\gamma
e$ Collisions at the NLC | 8 pages plus figures, gzipped compressed postscript file | null | null | SLAC-PUB-7155 | hep-ph | null | We examine the capability of the NLC in the $\gamma e$ collider mode to probe
the CP-conserving $\gamma WW$ and $\gamma ZZ$ anomalous couplings through the
use of the polarization asymmetry. When combined with other measurements, very
strong constraints on both varieties of anomalous couplings can be obtained.
[To appear in {\it Physics and Technology of the Next Linear Collider}, eds.
D.\ Burke and M.\ Peskin, reports submitted to Snowmass 1996.]
| [
{
"created": "Mon, 20 May 1996 02:29:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rizzo",
"Thomas G.",
""
]
] | We examine the capability of the NLC in the $\gamma e$ collider mode to probe the CP-conserving $\gamma WW$ and $\gamma ZZ$ anomalous couplings through the use of the polarization asymmetry. When combined with other measurements, very strong constraints on both varieties of anomalous couplings can be obtained. [To appear in {\it Physics and Technology of the Next Linear Collider}, eds. D.\ Burke and M.\ Peskin, reports submitted to Snowmass 1996.] |
2403.02147 | Selcuk Bilmis | T.M.Aliev, S.Bilmis, M.Savci | QCD Sum Rule study of $J^P = 1^\pm$ exotic states with two heavy quarks
in the molecular picture | To be published in Chinese Physics C | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this study, the spectroscopic parameters of the exotic molecular states
composed of mesons containing two heavy quarks (scalar-axial and
pseudoscalar-axial meson combinations) are investigated within QCD sum rules.
Our findings reveal that the molecular states containing charm quarks do not
form bound states, whereas the states with b-quarks can form the exotic
molecular states. This observation has significant implications for
understanding the structure of these exotic states.
| [
{
"created": "Mon, 4 Mar 2024 15:57:05 GMT",
"version": "v1"
}
] | 2024-03-05 | [
[
"Aliev",
"T. M.",
""
],
[
"Bilmis",
"S.",
""
],
[
"Savci",
"M.",
""
]
] | In this study, the spectroscopic parameters of the exotic molecular states composed of mesons containing two heavy quarks (scalar-axial and pseudoscalar-axial meson combinations) are investigated within QCD sum rules. Our findings reveal that the molecular states containing charm quarks do not form bound states, whereas the states with b-quarks can form the exotic molecular states. This observation has significant implications for understanding the structure of these exotic states. |
1910.06025 | Ajay Kumar Rai | Raghav Chaturvedi and Ajay Kumar Rai | Charmonium spectroscopy motivated by general features of pNRQCD | 17 pages, 4 figures (Suggestions and comments are invited) | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Mass spectrum of charmonium is computed in the framework of potential
non-relativistic quantum chromodynamics. \textit{O}$(1/m)$ and
\textit{O}$(1/m^2)$ relativistic corrections to the Cornell potential and
spin-dependent potential have been added, and is solved numerically. New
experimentally observed and modified positive and negative parity states like
${{\boldsymbol \psi}{(4230)}}$, ${{\boldsymbol \psi}{(4260)}}$, ${{\boldsymbol
\psi}{(4360)}}$, ${{\boldsymbol \psi}{(4390)}}$, ${{\boldsymbol
\psi}{(4660)}}$, ${{\boldsymbol \chi}_{{c1}}{(4140)}}$ and ${{\boldsymbol
\chi}_{{c1}}{(4274)}}$ near open-flavor threshold have also been studied. We
explain them as admixtures of S-D wave states and P-wave states. Apart from
these states, some other states like ${{\mathit X}{(3915)}}$, ${{\boldsymbol
\chi}_{{c1}}{(3872)}}$, ${{\boldsymbol \psi}{(3770)}}$ and ${{\boldsymbol
\psi}{(4160)}}$ have been identified as $2^3P_0$, $2^3P_1$, $1^3D_1$ and
$2^3D_1$ states. Subsequently, the electromagnetic transition widths and
$\gamma\gamma$, $e^+e^-$, light hadron and $\gamma\gamma\gamma$ decay widths of
several states are calculated at various leading orders. All the calculated
results are compared with experimental and results from various theoretical
models.
| [
{
"created": "Mon, 14 Oct 2019 10:23:55 GMT",
"version": "v1"
}
] | 2020-10-29 | [
[
"Chaturvedi",
"Raghav",
""
],
[
"Rai",
"Ajay Kumar",
""
]
] | Mass spectrum of charmonium is computed in the framework of potential non-relativistic quantum chromodynamics. \textit{O}$(1/m)$ and \textit{O}$(1/m^2)$ relativistic corrections to the Cornell potential and spin-dependent potential have been added, and is solved numerically. New experimentally observed and modified positive and negative parity states like ${{\boldsymbol \psi}{(4230)}}$, ${{\boldsymbol \psi}{(4260)}}$, ${{\boldsymbol \psi}{(4360)}}$, ${{\boldsymbol \psi}{(4390)}}$, ${{\boldsymbol \psi}{(4660)}}$, ${{\boldsymbol \chi}_{{c1}}{(4140)}}$ and ${{\boldsymbol \chi}_{{c1}}{(4274)}}$ near open-flavor threshold have also been studied. We explain them as admixtures of S-D wave states and P-wave states. Apart from these states, some other states like ${{\mathit X}{(3915)}}$, ${{\boldsymbol \chi}_{{c1}}{(3872)}}$, ${{\boldsymbol \psi}{(3770)}}$ and ${{\boldsymbol \psi}{(4160)}}$ have been identified as $2^3P_0$, $2^3P_1$, $1^3D_1$ and $2^3D_1$ states. Subsequently, the electromagnetic transition widths and $\gamma\gamma$, $e^+e^-$, light hadron and $\gamma\gamma\gamma$ decay widths of several states are calculated at various leading orders. All the calculated results are compared with experimental and results from various theoretical models. |
2312.10236 | Jo\~ao Barata | Jo\~ao Barata, Jean-Paul Blaizot, Yacine Mehtar-Tani | Quantum to classical parton evolution in the QGP | 4 pages, Proceedings of Quark Matter 2023 | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We study the time evolution of the density matrix of a high energy quark in
the presence of a dense QCD background that is modeled as a stochastic Gaussian
color field. At late times, we find that only the color singlet component of
the quark's reduced density matrix survives the in-medium evolution and that
the density matrix becomes asymptotically diagonal in both transverse position
and momentum spaces. In addition, we observe an accelerated entropy growth due
to the larger phase space being explored by the quark and that the quantum and
classical quark entropies converge at late times. We further observe that the
quark state loses all memory of the initial condition. Combined with the fact
that the reduced density matrix satisfies Boltzmann-diffusion transport, we
conclude that the quark reduced density matrix can be interpreted as a
classical phase space distribution.
| [
{
"created": "Fri, 15 Dec 2023 22:08:44 GMT",
"version": "v1"
}
] | 2023-12-19 | [
[
"Barata",
"João",
""
],
[
"Blaizot",
"Jean-Paul",
""
],
[
"Mehtar-Tani",
"Yacine",
""
]
] | We study the time evolution of the density matrix of a high energy quark in the presence of a dense QCD background that is modeled as a stochastic Gaussian color field. At late times, we find that only the color singlet component of the quark's reduced density matrix survives the in-medium evolution and that the density matrix becomes asymptotically diagonal in both transverse position and momentum spaces. In addition, we observe an accelerated entropy growth due to the larger phase space being explored by the quark and that the quantum and classical quark entropies converge at late times. We further observe that the quark state loses all memory of the initial condition. Combined with the fact that the reduced density matrix satisfies Boltzmann-diffusion transport, we conclude that the quark reduced density matrix can be interpreted as a classical phase space distribution. |
1901.04126 | Yun-Hua Chen | Yun-Hua Chen | Chromopolarizability of charmonium and $\pi\pi$ final state interaction
revisited | 8 pages, 1 figure | Advances in High Energy Physics, Volume 2019, Article ID 7650678 | 10.1155/2019/7650678 | null | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The chromopolarizability of a quarknonium describes the quarknonium's
interaction with soft gluonic fields and can be measured in the heavy
quarkonium decays. Within the framework of dispersion theory which consider the
$\pi\pi$ final state interaction (FSI) model-independently, we analyze the
transition $\psi^\prime\to J/\psi\pi^+\pi^-$ and obtain the
chromopolarizability $\alpha_{\psi^\prime \psi}$ and the parameter $\kappa$. It
is found that the $\pi\pi$ FSI plays an important role in extracting the
chromopolarizability from the experimental data. The obtained
chromopolarizability with the FSI is reduced to about 1/2 of that without the
FSI. With the FSI, we determine the chromopolarizability
$|\alpha_{\psi^\prime\psi}|=(1.44\pm 0.02)$ GeV$^{-3}$ and the parameter
$\kappa=0.139\pm 0.005.$ Our results could be useful in studying the
interactions of charmonium with light hadrons.
| [
{
"created": "Mon, 14 Jan 2019 04:38:34 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Jan 2019 14:24:01 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Mar 2019 13:42:28 GMT",
"version": "v3"
},
{
"created": "Thu, 2 May 2019 16:11:32 GMT",
"version": "v4"
}
] | 2019-05-03 | [
[
"Chen",
"Yun-Hua",
""
]
] | The chromopolarizability of a quarknonium describes the quarknonium's interaction with soft gluonic fields and can be measured in the heavy quarkonium decays. Within the framework of dispersion theory which consider the $\pi\pi$ final state interaction (FSI) model-independently, we analyze the transition $\psi^\prime\to J/\psi\pi^+\pi^-$ and obtain the chromopolarizability $\alpha_{\psi^\prime \psi}$ and the parameter $\kappa$. It is found that the $\pi\pi$ FSI plays an important role in extracting the chromopolarizability from the experimental data. The obtained chromopolarizability with the FSI is reduced to about 1/2 of that without the FSI. With the FSI, we determine the chromopolarizability $|\alpha_{\psi^\prime\psi}|=(1.44\pm 0.02)$ GeV$^{-3}$ and the parameter $\kappa=0.139\pm 0.005.$ Our results could be useful in studying the interactions of charmonium with light hadrons. |
hep-ph/9610223 | Paul Mackenzie | Brian J. Gough, George M. Hockney, Aida X. El-Khadra, Andreas S.
Kronfeld, Paul B. Mackenzie, Bart P. Mertens, Tetsuya Onogi, and James N.
Simone | The Light Quark Masses from Lattice Gauge Theory | 4 pages, two embedded figures | Phys.Rev.Lett.79:1622-1625,1997 | 10.1103/PhysRevLett.79.1622 | Fermilab Pub-96-283, Illinois ILL-TH-96-07, Hiroshima HUPD-961 | hep-ph | null | We investigate the masses of the light quarks with lattice QCD. We show that
most of the large dependence on the lattice spacing, a, observed in previous
determinations using Wilson fermions is removed with the use of an O(a)
corrected action. In the quenched approximation, we obtain for the strange
quark MS bar mass m_s(2 GeV) = 95 (16) MeV, and for the average of the up and
down quark masses m_l(2 GeV) = 3.6 (6) MeV. Short distance arguments and
existing staggered fermion calculations make it likely that the answers
including the effects of quark loops lie 20 % to 40 % below this: m_s(2 GeV) in
the range 54-92 MeV, and m_l(2 GeV) in the range 2.1-3.5 MeV. We argue that
almost all lattice determinations of the light quark masses are consistent with
these values. These low values are outside the range usually given by
conventional phenomenology.
| [
{
"created": "Wed, 2 Oct 1996 22:01:25 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Gough",
"Brian J.",
""
],
[
"Hockney",
"George M.",
""
],
[
"El-Khadra",
"Aida X.",
""
],
[
"Kronfeld",
"Andreas S.",
""
],
[
"Mackenzie",
"Paul B.",
""
],
[
"Mertens",
"Bart P.",
""
],
[
"Onogi",
"Tetsuya",
... | We investigate the masses of the light quarks with lattice QCD. We show that most of the large dependence on the lattice spacing, a, observed in previous determinations using Wilson fermions is removed with the use of an O(a) corrected action. In the quenched approximation, we obtain for the strange quark MS bar mass m_s(2 GeV) = 95 (16) MeV, and for the average of the up and down quark masses m_l(2 GeV) = 3.6 (6) MeV. Short distance arguments and existing staggered fermion calculations make it likely that the answers including the effects of quark loops lie 20 % to 40 % below this: m_s(2 GeV) in the range 54-92 MeV, and m_l(2 GeV) in the range 2.1-3.5 MeV. We argue that almost all lattice determinations of the light quark masses are consistent with these values. These low values are outside the range usually given by conventional phenomenology. |
hep-ph/0509371 | Stefano Forte | Stefano Forte | Progress in Small x Resummation | 8 pages, 6 figures, LaTeX with IJMPA document class, invited plenary
talk at the conference on QCD and hadronic physics, Beijing 2005 | Int.J.Mod.Phys. A21 (2006) 769-776 | 10.1142/S0217751X06032010 | IFUM-847/FT | hep-ph | null | I review recent theoretical progress in the resummation of small x
contributions to the evolution of parton distributions, in view of its
potential significance for accurate phenomenology at future colliders. I show
that a consistent perturbative resummation of collinear and energy logs is now
possible, and necessary if one wishes to use recent NNLO results in the HERA
kinematic region.
| [
{
"created": "Fri, 30 Sep 2005 16:38:59 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Forte",
"Stefano",
""
]
] | I review recent theoretical progress in the resummation of small x contributions to the evolution of parton distributions, in view of its potential significance for accurate phenomenology at future colliders. I show that a consistent perturbative resummation of collinear and energy logs is now possible, and necessary if one wishes to use recent NNLO results in the HERA kinematic region. |
0911.4091 | Dmitry Borisyuk | Dmitry Borisyuk | Proton charge and magnetic rms radii from the elastic $ep$ scattering
data | 6 pages, 4 figures. Numbers slightly changed due to discovered error
in minimization program. Sec.III revised, discussion of G_E behaviour added. | Nucl.Phys.A843:59-67,2010 | 10.1016/j.nuclphysa.2010.05.054 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The elastic electron-proton scattering data are analysed in order to
determine proton charge and magnetic rms radii, r_E and r_M. Along with the
usual statistical error, we try to estimate a systematic error in the radii,
caused by the inadequacy of particular form factor parameterization employed.
The range of data to use in the analysis is chosen so as to minimize the total
(statistical + systematic) error. We obtain r_E = 0.912 +- 0.009 (stat) +-
0.007 (syst) fm, and r_M = 0.876 +- 0.010 (stat) +- 0.016 (syst) fm. The
cross-section data were corrected for two-photon exchange. We found that
without such corrections obtained r_E and r_M are somewhat smaller while the
quality of fit is worse.
| [
{
"created": "Fri, 20 Nov 2009 20:26:03 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Apr 2010 20:39:43 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Borisyuk",
"Dmitry",
""
]
] | The elastic electron-proton scattering data are analysed in order to determine proton charge and magnetic rms radii, r_E and r_M. Along with the usual statistical error, we try to estimate a systematic error in the radii, caused by the inadequacy of particular form factor parameterization employed. The range of data to use in the analysis is chosen so as to minimize the total (statistical + systematic) error. We obtain r_E = 0.912 +- 0.009 (stat) +- 0.007 (syst) fm, and r_M = 0.876 +- 0.010 (stat) +- 0.016 (syst) fm. The cross-section data were corrected for two-photon exchange. We found that without such corrections obtained r_E and r_M are somewhat smaller while the quality of fit is worse. |
2405.18017 | Di Zhang | Di Zhang | Threshold Effects on the Massless Neutrino in the Canonical Seesaw
Mechanism | 8 pages, 3 figures | null | null | TUM-HEP 1512/24 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we revisit the one-loop renormalization group equations (RGEs)
among non-degenerate seesaw scales, i.e., threshold effects in the canonical
seesaw mechanism, which have been obtained for more than two decades. We find
some contributions from the Weinberg operator to its Wilson coefficient, the
neutrino Yukawa coupling matrix, and the Higgs quartic coupling absent in the
previous calculations. Based on the updated one-loop RGEs, we derive the RGE of
the effective neutrino mass matrix's determinant without any approximation.
Then, for the first time, we provide a strict proof that the one-loop RG
running effects among non-degenerate seesaw scales can not generate a non-zero
mass for the initial massless neutrino in the minimal type-I seesaw mechanism
or in the canonical one with a rank-degenerate neutrino Yukawa coupling matrix.
One has to include two- or higher-loop corrections to achieve a non-zero mass
for the massless neutrino.
| [
{
"created": "Tue, 28 May 2024 09:59:08 GMT",
"version": "v1"
}
] | 2024-05-29 | [
[
"Zhang",
"Di",
""
]
] | In this work, we revisit the one-loop renormalization group equations (RGEs) among non-degenerate seesaw scales, i.e., threshold effects in the canonical seesaw mechanism, which have been obtained for more than two decades. We find some contributions from the Weinberg operator to its Wilson coefficient, the neutrino Yukawa coupling matrix, and the Higgs quartic coupling absent in the previous calculations. Based on the updated one-loop RGEs, we derive the RGE of the effective neutrino mass matrix's determinant without any approximation. Then, for the first time, we provide a strict proof that the one-loop RG running effects among non-degenerate seesaw scales can not generate a non-zero mass for the initial massless neutrino in the minimal type-I seesaw mechanism or in the canonical one with a rank-degenerate neutrino Yukawa coupling matrix. One has to include two- or higher-loop corrections to achieve a non-zero mass for the massless neutrino. |
2210.05703 | Xabier Marcano | Fabiola Fortuna, Alejandro Ibarra, Xabier Marcano, Marcela Mar\'in,
Pablo Roig | Indirect upper limits on $\ell_i\to\ell_j\gamma\gamma$ from
$\ell_i\to\ell_j\gamma$ | 5 pages, 3 figures | Phys. Rev. D 107, 2023, 015027 | 10.1103/PhysRevD.107.015027 | TUM-HEP 1422/22, IFT-UAM/CSIC-22-124 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We perform an effective field theory analysis to correlate the charged lepton
flavor violating processes $\ell_i\to\ell_j\gamma\gamma$ and
$\ell_i\to\ell_j\gamma$. Using the current upper bounds on the rate for
$\ell_i\to\ell_j\gamma$, we derive model-independent upper limits on the rates
for $\ell_i\to\ell_j\gamma\gamma$. Our indirect limits are about three orders
of magnitude stronger than the direct bounds from current searches for $\mu\to
e\gamma\gamma$, and four orders of magnitude better than current bounds for
$\tau\to\ell\gamma\gamma$. We also stress the relevance of Belle II or a Super
Tau Charm Facility to discover the rare decay $\tau\to\ell\gamma\gamma$.
| [
{
"created": "Tue, 11 Oct 2022 18:05:55 GMT",
"version": "v1"
}
] | 2023-01-31 | [
[
"Fortuna",
"Fabiola",
""
],
[
"Ibarra",
"Alejandro",
""
],
[
"Marcano",
"Xabier",
""
],
[
"Marín",
"Marcela",
""
],
[
"Roig",
"Pablo",
""
]
] | We perform an effective field theory analysis to correlate the charged lepton flavor violating processes $\ell_i\to\ell_j\gamma\gamma$ and $\ell_i\to\ell_j\gamma$. Using the current upper bounds on the rate for $\ell_i\to\ell_j\gamma$, we derive model-independent upper limits on the rates for $\ell_i\to\ell_j\gamma\gamma$. Our indirect limits are about three orders of magnitude stronger than the direct bounds from current searches for $\mu\to e\gamma\gamma$, and four orders of magnitude better than current bounds for $\tau\to\ell\gamma\gamma$. We also stress the relevance of Belle II or a Super Tau Charm Facility to discover the rare decay $\tau\to\ell\gamma\gamma$. |
1712.02202 | J\'er\^ome Charles | J\'er\^ome Charles, David Greynat, Eduardo de Rafael | The Mellin-Barnes Approach to Hadronic Vacuum Polarization and
$g_{\mu}-2$ | 37 pages, many figures. V2: Numerical results updated according to
arXiv:1802.02995v1. V3: Published version with improvements suggested by the
referee, conclusions unchanged | Phys. Rev. D 97, 076014 (2018) | 10.1103/PhysRevD.97.076014 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that with a precise determination of a few derivatives of the
hadronic vacuum polarization (HVP) self-energy function $\Pi(Q^2)$ at $Q^2=0$,
from lattice QCD (LQCD) or from a dedicated low-energy experiment, one can
obtain an evaluation of the lowest order HVP contribution to the anomalous
magnetic moment of the muon $a_{\mu}^{\rm HVP}$ with an accuracy comparable to
the one reached using the $e^+ e^-$ annihilation cross-section into hadrons.
The technique of Mellin-Barnes approximants (MBa) that we propose is
illustrated in detail with the example of the two loop vacuum polarization
function in QED. We then apply it to the first few moments of the hadronic
spectral function obtained from experiment and show that the resulting MBa
evaluations of $a_{\mu}^{\rm HVP}$ converge very quickly to the full
experimental determination.
| [
{
"created": "Wed, 6 Dec 2017 14:38:21 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Feb 2018 14:51:29 GMT",
"version": "v2"
},
{
"created": "Wed, 9 May 2018 10:10:02 GMT",
"version": "v3"
}
] | 2018-05-16 | [
[
"Charles",
"Jérôme",
""
],
[
"Greynat",
"David",
""
],
[
"de Rafael",
"Eduardo",
""
]
] | It is shown that with a precise determination of a few derivatives of the hadronic vacuum polarization (HVP) self-energy function $\Pi(Q^2)$ at $Q^2=0$, from lattice QCD (LQCD) or from a dedicated low-energy experiment, one can obtain an evaluation of the lowest order HVP contribution to the anomalous magnetic moment of the muon $a_{\mu}^{\rm HVP}$ with an accuracy comparable to the one reached using the $e^+ e^-$ annihilation cross-section into hadrons. The technique of Mellin-Barnes approximants (MBa) that we propose is illustrated in detail with the example of the two loop vacuum polarization function in QED. We then apply it to the first few moments of the hadronic spectral function obtained from experiment and show that the resulting MBa evaluations of $a_{\mu}^{\rm HVP}$ converge very quickly to the full experimental determination. |
hep-ph/0305072 | Ulrich Jentschura | Ulrich D. Jentschura | Extrapolation of the Zalpha-Expansion and Two--Loop Bound--State Energy
Shifts | 10 pages, LaTeX, Phys. Lett. B, in press | Phys.Lett. B564 (2003) 225-230 | 10.1016/S0370-2693(03)00562-8 | null | hep-ph | null | Quantum electrodynamic (QED) effects that shift the binding energies of
hydrogenic energy levels have been expressed in terms of a semi-analytic
expansion in powers of Zalpha and ln[(Zalpha)^{-2}], where Z is the nuclear
charge number and alpha is the fine-structure constant. For many QED effects,
numerical data are available in the domain of high Z where the Zalpha expansion
fails. In this Letter, we demonstrate that it is possible, within certain
limits of accuracy, to extrapolate the Zalpha-expansion from the low-Z to the
high-Z domain. We also review two-loop self-energy effects and provide an
estimate for the problematic nonlogarithmic coefficient B_60.
| [
{
"created": "Wed, 7 May 2003 13:29:10 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Jentschura",
"Ulrich D.",
""
]
] | Quantum electrodynamic (QED) effects that shift the binding energies of hydrogenic energy levels have been expressed in terms of a semi-analytic expansion in powers of Zalpha and ln[(Zalpha)^{-2}], where Z is the nuclear charge number and alpha is the fine-structure constant. For many QED effects, numerical data are available in the domain of high Z where the Zalpha expansion fails. In this Letter, we demonstrate that it is possible, within certain limits of accuracy, to extrapolate the Zalpha-expansion from the low-Z to the high-Z domain. We also review two-loop self-energy effects and provide an estimate for the problematic nonlogarithmic coefficient B_60. |
0804.2858 | Federico Urban | Federico R. Urban | On the Brane Cosmology of KK Gravitinos | To appear in the Proceedings of the XXXVI ITEP Winter School 2008,
Session ``Particle Physics'', held in Otradnoe, Moscow Region, Russia,
February 8--16, 2008 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this report I consider the cosmology of KK gravitinos in models with extra
dimensions, in particular in connection with the known non--standard high
energy regime of expansion which is associated with them. The main result is
that the production of such KK modes, once one considers BBN constraints on the
allowed entropy released in their decays, is not compatible with non--standard
expansion after inflation: there is no five--dimensional Planck mass for which
the produced KK gravitinos are safe with respect to BBN. This conclusion holds
for both flat and warped models in which only gravity propagates in the full
spacetime. This report is based on the work arXiv:0705.4227 [hep-ph].
| [
{
"created": "Thu, 17 Apr 2008 17:17:37 GMT",
"version": "v1"
}
] | 2008-04-18 | [
[
"Urban",
"Federico R.",
""
]
] | In this report I consider the cosmology of KK gravitinos in models with extra dimensions, in particular in connection with the known non--standard high energy regime of expansion which is associated with them. The main result is that the production of such KK modes, once one considers BBN constraints on the allowed entropy released in their decays, is not compatible with non--standard expansion after inflation: there is no five--dimensional Planck mass for which the produced KK gravitinos are safe with respect to BBN. This conclusion holds for both flat and warped models in which only gravity propagates in the full spacetime. This report is based on the work arXiv:0705.4227 [hep-ph]. |
1807.07823 | Salvatore Marco Giampaolo | A. Capolupo, S. M. Giampaolo, G. Lambiase | Decoherence in neutrino oscillations, neutrino nature and CPT violation | 7 pages, 3 figures | null | 10.1016/j.physletb.2019.03.062 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze many aspects of the phenomenon of the decoherence for neutrinos
propagating in long baseline experiments. We show that, in the presence of an
off-diagonal term in the dissipative matrix, the Majorana neutrino can violate
the CP T symmetry, which, on the contrary, is preserved for Dirac neutrinos. We
show that oscillation formulas for Majorana neutrinos depend on the choice of
the mixing matrix U. Indeed, different choices of U lead to different
oscillation formulas. Moreover, we study the possibility to reveal the
differences between Dirac and Majorana neutrinos in the oscillations. We use
the present values of the experimental parameters in order to relate our
theoretical proposal with experiments.
| [
{
"created": "Fri, 20 Jul 2018 13:03:59 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Sep 2018 11:35:27 GMT",
"version": "v2"
}
] | 2019-05-22 | [
[
"Capolupo",
"A.",
""
],
[
"Giampaolo",
"S. M.",
""
],
[
"Lambiase",
"G.",
""
]
] | We analyze many aspects of the phenomenon of the decoherence for neutrinos propagating in long baseline experiments. We show that, in the presence of an off-diagonal term in the dissipative matrix, the Majorana neutrino can violate the CP T symmetry, which, on the contrary, is preserved for Dirac neutrinos. We show that oscillation formulas for Majorana neutrinos depend on the choice of the mixing matrix U. Indeed, different choices of U lead to different oscillation formulas. Moreover, we study the possibility to reveal the differences between Dirac and Majorana neutrinos in the oscillations. We use the present values of the experimental parameters in order to relate our theoretical proposal with experiments. |
hep-ph/9312225 | Noriaki Kitazawa | N.Kitazawa and T.Kurimoto | Heavy meson effective thoery with 1/M_Q correction | 14pages, revtex | Phys.Lett. B323 (1994) 65-70 | 10.1016/0370-2693(94)00047-6 | DPNU-93-37, OS-GE 38-93 | hep-ph | null | We construct an effective Lagrangian of heavy and light mesons with $1/M_Q$
correction. The Lagrangian is constructed model independent way by using only
the information of the symmetry of QCD. Reparameterisation invariance at the
meson level is taken into account for the consistency of the theory. The
partial decay width of the process $D^{*+} \rightarrow D^0 \pi^+$ and the form
factors of the process ${\bar B}^0 \rightarrow \pi^+ l {\bar \nu}$ are
calculated with the $1/M_Q$ correction. We also introduce the light vector
mesons based on the approach of the hidden local symmetry. The form factors of
the process ${\bar B}^0 \rightarrow \rho^+ l {\bar \nu}$ are calculated with
thus introduced $\rho$-meson. These results are easily translated to the
$D$-meson semileptonic decays.
| [
{
"created": "Mon, 6 Dec 1993 09:23:03 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Kitazawa",
"N.",
""
],
[
"Kurimoto",
"T.",
""
]
] | We construct an effective Lagrangian of heavy and light mesons with $1/M_Q$ correction. The Lagrangian is constructed model independent way by using only the information of the symmetry of QCD. Reparameterisation invariance at the meson level is taken into account for the consistency of the theory. The partial decay width of the process $D^{*+} \rightarrow D^0 \pi^+$ and the form factors of the process ${\bar B}^0 \rightarrow \pi^+ l {\bar \nu}$ are calculated with the $1/M_Q$ correction. We also introduce the light vector mesons based on the approach of the hidden local symmetry. The form factors of the process ${\bar B}^0 \rightarrow \rho^+ l {\bar \nu}$ are calculated with thus introduced $\rho$-meson. These results are easily translated to the $D$-meson semileptonic decays. |
hep-ph/0508009 | Debajyoti Choudhury | Debajyoti Choudhury (Univ of Delhi, India), Madhumita Datta and Manas
Maity (Visva-Bharati, India) | Looking for the Top-squark at the Tevatron with four jets | 4 pages, 4 embedded figures, RevTeX | Phys.Rev. D73 (2006) 055013 | 10.1103/PhysRevD.73.055013 | null | hep-ph | null | The scalar partner of the top quark is relatively light in many models of
supersymmetry breaking. We study the production of top squarks (stops) at the
Tevatron collider and their subsequent decay through baryon-number violating
couplings such that the final state contains no leptons. Performing a
detector-level analysis, we demonstrate that, even in the absence of leptons or
missing energy, stop masses upto 210 \gev/c^2 can be accessible at the
Tevatron.
| [
{
"created": "Sun, 31 Jul 2005 05:27:17 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Choudhury",
"Debajyoti",
"",
"Univ of Delhi, India"
],
[
"Datta",
"Madhumita",
"",
"Visva-Bharati, India"
],
[
"Maity",
"Manas",
"",
"Visva-Bharati, India"
]
] | The scalar partner of the top quark is relatively light in many models of supersymmetry breaking. We study the production of top squarks (stops) at the Tevatron collider and their subsequent decay through baryon-number violating couplings such that the final state contains no leptons. Performing a detector-level analysis, we demonstrate that, even in the absence of leptons or missing energy, stop masses upto 210 \gev/c^2 can be accessible at the Tevatron. |
hep-ph/9703211 | Stephen P. Martin | S. Ambrosanio, Graham D. Kribs and Stephen P. Martin | Signals for gauge-mediated supersymmetry breaking models at the CERN
LEP2 collider | 36 pages, LaTeX, 10 figures embedded using epsf.sty (published
version; minor changes in wording) | Phys.Rev.D56:1761-1777,1997 | 10.1103/PhysRevD.56.1761 | null | hep-ph hep-ex | null | We consider a general class of models with gauge-mediated supersymmetry
breaking in which the gravitino is the lightest supersymmetric particle.
Several qualitatively different scenarios arise for the phenomenology of such
models, depending on which superpartner(s) decay dominantly to the gravitino.
At LEP2, neutralino pair production and slepton pair production can lead to a
variety of promising discovery signals, which we systematically study. We
investigate the impact of backgrounds for these signals and show how they can
be reduced, and outline the effects of model parameter variations on the
discovery potential.
| [
{
"created": "Sun, 2 Mar 1997 22:29:30 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jun 1997 15:22:42 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Ambrosanio",
"S.",
""
],
[
"Kribs",
"Graham D.",
""
],
[
"Martin",
"Stephen P.",
""
]
] | We consider a general class of models with gauge-mediated supersymmetry breaking in which the gravitino is the lightest supersymmetric particle. Several qualitatively different scenarios arise for the phenomenology of such models, depending on which superpartner(s) decay dominantly to the gravitino. At LEP2, neutralino pair production and slepton pair production can lead to a variety of promising discovery signals, which we systematically study. We investigate the impact of backgrounds for these signals and show how they can be reduced, and outline the effects of model parameter variations on the discovery potential. |
0710.2846 | Tri-Nang Pham | T. N. Pham | Two-photon decay of heavy quarkonium from heavy-quark spin symmetry | 9 pages, Talk given at the QCD@Work 2007 International Workshop on
QCD: Theory and Experiment}, Martina Franca, Italy, 16--20 June 2007 | AIPConf.Proc.964:124-131,2007 | 10.1063/1.2823837 | null | hep-ph | null | With the recent measurements on $\eta_{c}$ and $\eta_{c}^{\prime}$ at CLEO,
Babar and Belle, and with the prospect of finding the $\eta_{b}$ at the
Tevatron, it seems appropriate to have another look at the two-photon decay of
heavy quarkonium from the standpoint of an effective Lagrangian based on local
operator expansion and heavy-quark spin symmetry. In this talk, I would like to
discuss a recent work on the two-photon decay rates of ground states and
excited states of $\eta_c$ and $\eta_b$ using the local operator expansion
approach and heavy-quark spin symmetry and taking into account the
binding-energy. We find that the predicted two-photon width for $\eta_c$ agrees
well with experiment, but the predicted value for $\eta_c(2S)$ is twice larger
than the CLEO estimation. We point out that the essentially model-independent
ratio of $\eta_b$ two-photon width to the $\Upsilon$ leptonic width and the
$\eta_b $ two-photon width could be used to extract the strong coupling
constant $\alpha_s$ .
| [
{
"created": "Mon, 15 Oct 2007 15:31:56 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Pham",
"T. N.",
""
]
] | With the recent measurements on $\eta_{c}$ and $\eta_{c}^{\prime}$ at CLEO, Babar and Belle, and with the prospect of finding the $\eta_{b}$ at the Tevatron, it seems appropriate to have another look at the two-photon decay of heavy quarkonium from the standpoint of an effective Lagrangian based on local operator expansion and heavy-quark spin symmetry. In this talk, I would like to discuss a recent work on the two-photon decay rates of ground states and excited states of $\eta_c$ and $\eta_b$ using the local operator expansion approach and heavy-quark spin symmetry and taking into account the binding-energy. We find that the predicted two-photon width for $\eta_c$ agrees well with experiment, but the predicted value for $\eta_c(2S)$ is twice larger than the CLEO estimation. We point out that the essentially model-independent ratio of $\eta_b$ two-photon width to the $\Upsilon$ leptonic width and the $\eta_b $ two-photon width could be used to extract the strong coupling constant $\alpha_s$ . |
hep-ph/9612247 | L. B. Okun | L. B. Okun | Tests of CPT | Latex, 5 pages,Talk at the Workshop on $K$-physics, ORSAY, France, 30
May - 4 June, 1996 | null | null | ITEP-TH-55/96 | hep-ph | null | A few remarks concerning theoretical suggestions and experimental tests of
CPT during 1980's - 1990's. Is it worth to search for the particle-antiparticle
mass differences in sectors other than $K^0\bar{K}^0$?
| [
{
"created": "Wed, 4 Dec 1996 13:20:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Okun",
"L. B.",
""
]
] | A few remarks concerning theoretical suggestions and experimental tests of CPT during 1980's - 1990's. Is it worth to search for the particle-antiparticle mass differences in sectors other than $K^0\bar{K}^0$? |
hep-ph/0301022 | Prasanta Kumar Das | Uma Mahanta and Prasanta Das | The effect of a light radion on the triviality bound on higgs mass | 9 pages, latex, 2 eps figures | Int.J.Mod.Phys.A20:1089-1093,2005 | 10.1142/S0217751X05020719 | null | hep-ph | null | In this paper we study how the triviality bound on higgs mass in the context
of the SM is modified by a light stabilized radion of the Goldberger-Wise
variety. Our approach is inherently perturbative. Including the radion
contribution to $\bt(\l)$ and $\bt(g_t)$ to one loop we evolve the higgs self
coupling $\l$ from the cut off $\L(=\vphi)$ down to the EW scale $\mu_0 = v$.
The triviality bound is obtained by requiring that $\l(\L) = \sqrt{4 \pi}$
which is the perturbative limit. We also study the effect of small changes in
the UVBC on the triviality bound both in the presence and absence of a light
radion.
| [
{
"created": "Sun, 5 Jan 2003 18:13:30 GMT",
"version": "v1"
}
] | 2010-11-05 | [
[
"Mahanta",
"Uma",
""
],
[
"Das",
"Prasanta",
""
]
] | In this paper we study how the triviality bound on higgs mass in the context of the SM is modified by a light stabilized radion of the Goldberger-Wise variety. Our approach is inherently perturbative. Including the radion contribution to $\bt(\l)$ and $\bt(g_t)$ to one loop we evolve the higgs self coupling $\l$ from the cut off $\L(=\vphi)$ down to the EW scale $\mu_0 = v$. The triviality bound is obtained by requiring that $\l(\L) = \sqrt{4 \pi}$ which is the perturbative limit. We also study the effect of small changes in the UVBC on the triviality bound both in the presence and absence of a light radion. |
1605.02496 | Kazem Azizi | S. S. Agaev, K. Azizi, H. Sundu | Application of the QCD light cone sum rule to tetraquarks: the strong
vertices $X_bX_b\rho$ and $X_cX_c\rho$ | 10 Pages, 5 Figures and 1 Table | Phys. Rev. D 93, 114036 (2016) | 10.1103/PhysRevD.93.114036 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The full version of QCD light-cone sum rule method is applied to tetraquarks
containing a single heavy $b$ or $c$ quark. To this end, investigations of the
strong vertices $X_{b}X_{b}\rho$ and $X_{c}X_{c}\rho$ are performed, where
$X_b=[su][\bar b\bar d]$ and $X_c=[su][\bar c\bar d]$ are the exotic states
built of four quarks of different flavors. The strong coupling constants
$G_{X_{b}X_{b}\rho}$ and $G_{X_{c}X_{c}\rho}$ corresponding to these vertices
are found using the $\rho$-meson leading and higher-twist distribution
amplitudes. In the calculations $X_{b}$ and $X_{c}$ are treated as scalar bound
states of a diquark and antidiquark.
| [
{
"created": "Mon, 9 May 2016 09:51:43 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Jun 2016 18:31:26 GMT",
"version": "v2"
},
{
"created": "Fri, 24 Feb 2017 11:46:35 GMT",
"version": "v3"
}
] | 2017-02-27 | [
[
"Agaev",
"S. S.",
""
],
[
"Azizi",
"K.",
""
],
[
"Sundu",
"H.",
""
]
] | The full version of QCD light-cone sum rule method is applied to tetraquarks containing a single heavy $b$ or $c$ quark. To this end, investigations of the strong vertices $X_{b}X_{b}\rho$ and $X_{c}X_{c}\rho$ are performed, where $X_b=[su][\bar b\bar d]$ and $X_c=[su][\bar c\bar d]$ are the exotic states built of four quarks of different flavors. The strong coupling constants $G_{X_{b}X_{b}\rho}$ and $G_{X_{c}X_{c}\rho}$ corresponding to these vertices are found using the $\rho$-meson leading and higher-twist distribution amplitudes. In the calculations $X_{b}$ and $X_{c}$ are treated as scalar bound states of a diquark and antidiquark. |
2101.00142 | Xingchen Xu | Xingchen Xu, Glennys R. Farrar | Resonant Scattering between Dark Matter and Baryons: Revised Direct
Detection and CMB Limits | 31+10 pages,15+3 figures. v2 adds some citations and additional
analyses: (1) repulsive as well as attractive interaction, (2) separate
analysis of CMB and CMB+Ly-alpha limits & non-trivial role of DM-He
scattering relative to Born case, (3) Milky Way gas clouds and Milky Way
satellites, (4) velocity dependence near resonances (& approximate analytic
expression), (4) dependence on mediator mass | null | null | null | hep-ph astro-ph.CO astro-ph.HE hep-ex | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Traditional dark matter models, eg. WIMPs, assume dark matter is weakly
coupled to the standard model so that elastic scattering between dark matter
and baryons can be described perturbatively by Born approximation. Most direct
detection experiments are analyzed according to that assumption. We show that
when the fundamental DM-baryon interaction is attractive, dark matter-nucleus
scattering is non-perturbative in much of the relevant parameter range. The
cross section exhibits rich resonant behavior with a highly non-trivial
dependence on atomic mass; furthermore, the extended rather than point-like
nature of nuclei significantly impacts the cross sections. The repulsive case
also requires full numerical calculation. These non-perturbative effects change
existing constraints.
Near a resonance value of the parameters, the cross section has non-trivial
velocity dependence rather than the usual $\sigma \sim v^0$; we take the
velocity dependence into account. (However doing so has little impact on
current constraints.)
We report the corrected exclusion regions superseding previous limits from
XQC, CRESST Surface Run, CMB power spectrum and extensions with Lyman-$\alpha$
and Milky Way satellites, and Milky Way gas clouds. Some limits become weaker
than previous bounds in the literature, while others become stronger. Gaps
which open by correct treatment of some particular constraint can sometimes be
closed using a different constraint. We also discuss the dependence on mediator
mass and give approximate expressions for the velocity dependence near a
resonance. Sexaquark ($uuddss$) DM with mass around 2 GeV, which exchanges QCD
mesons with baryons, remains unconstrained for most of the parameter space of
interest.
A statement in the literature that a DM-nucleus cross section larger than
$10^{-25}\,{\rm cm}^2$ implies dark matter is composite, is corrected.
| [
{
"created": "Fri, 1 Jan 2021 02:41:08 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Dec 2021 12:52:26 GMT",
"version": "v2"
}
] | 2021-12-03 | [
[
"Xu",
"Xingchen",
""
],
[
"Farrar",
"Glennys R.",
""
]
] | Traditional dark matter models, eg. WIMPs, assume dark matter is weakly coupled to the standard model so that elastic scattering between dark matter and baryons can be described perturbatively by Born approximation. Most direct detection experiments are analyzed according to that assumption. We show that when the fundamental DM-baryon interaction is attractive, dark matter-nucleus scattering is non-perturbative in much of the relevant parameter range. The cross section exhibits rich resonant behavior with a highly non-trivial dependence on atomic mass; furthermore, the extended rather than point-like nature of nuclei significantly impacts the cross sections. The repulsive case also requires full numerical calculation. These non-perturbative effects change existing constraints. Near a resonance value of the parameters, the cross section has non-trivial velocity dependence rather than the usual $\sigma \sim v^0$; we take the velocity dependence into account. (However doing so has little impact on current constraints.) We report the corrected exclusion regions superseding previous limits from XQC, CRESST Surface Run, CMB power spectrum and extensions with Lyman-$\alpha$ and Milky Way satellites, and Milky Way gas clouds. Some limits become weaker than previous bounds in the literature, while others become stronger. Gaps which open by correct treatment of some particular constraint can sometimes be closed using a different constraint. We also discuss the dependence on mediator mass and give approximate expressions for the velocity dependence near a resonance. Sexaquark ($uuddss$) DM with mass around 2 GeV, which exchanges QCD mesons with baryons, remains unconstrained for most of the parameter space of interest. A statement in the literature that a DM-nucleus cross section larger than $10^{-25}\,{\rm cm}^2$ implies dark matter is composite, is corrected. |
2102.12237 | Johannes Bl\"umlein | J. Bl\"umlein, A. De Freitas, and K. Sch\"onwald | The QED Initial State Corrections to the Forward-Backward Asymmetry of
$e^+e^- \to \gamma^*/Z^{0*}$ to Higher Orders | Dedicated to the Memory of Tini Veltman, who made it possible to
probe the Standard Model at high precision | null | 10.1016/j.physletb.2021.136250 | DESY 21--013, DO--TH 21/04, TTP21--004, SAGEX--21--03 | hep-ph hep-ex | http://creativecommons.org/licenses/by-sa/4.0/ | The QED initial state corrections are calculated to the forward-backward
asymmetry for $e^+e^- \rightarrow \gamma^*/{Z^{0}}^*$ in the leading
logarithmic approximation to $O(\alpha^6 L^6)$ extending the known corrections
up to $O(\alpha^2 L^2)$ in analytic form. We use the method of massive on-shell
operator matrix elements and present the radiators both in Mellin-$N$ and
momentum fraction $z$-space. Numerical results are presented for various
energies around the $Z$-peak by also including energy cuts. These corrections
are of relevance for the precision measurements at the FCC$\_$ee.
| [
{
"created": "Wed, 24 Feb 2021 11:59:59 GMT",
"version": "v1"
}
] | 2021-04-28 | [
[
"Blümlein",
"J.",
""
],
[
"De Freitas",
"A.",
""
],
[
"Schönwald",
"K.",
""
]
] | The QED initial state corrections are calculated to the forward-backward asymmetry for $e^+e^- \rightarrow \gamma^*/{Z^{0}}^*$ in the leading logarithmic approximation to $O(\alpha^6 L^6)$ extending the known corrections up to $O(\alpha^2 L^2)$ in analytic form. We use the method of massive on-shell operator matrix elements and present the radiators both in Mellin-$N$ and momentum fraction $z$-space. Numerical results are presented for various energies around the $Z$-peak by also including energy cuts. These corrections are of relevance for the precision measurements at the FCC$\_$ee. |
hep-ph/9311294 | Gregory Korchemsky | G.P.Korchemsky | On near forward high energy scattering in QCD | LaTeX style, 13 pages, 4 figures (included) | Phys.Lett. B325 (1994) 459-466 | 10.1016/0370-2693(94)90040-X | ITP-SB-93-73 | hep-ph hep-th | null | We consider elastic quark-quark scattering at high energy and fixed
transferred momentum. Performing factorization of soft gluon exchanges into
Wilson lines vacuum expectation values and studying their properties, we find
that the asymptotics of the scattering amplitude is controlled by the
renormalization properties of the so called cross singularities of Wilson
loops. Using this fact, we evaluate the scattering amplitude and show that its
asymptotics is determined by the properties of the $2\times 2$ matrix of
anomalous dimensions which appears after one renormalizes the cross
singularities of Wilson loops. A generalization to the case of quark-antiquark
and gluon-gluon elastic scattering is discussed.
| [
{
"created": "Mon, 15 Nov 1993 17:25:07 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Nov 1993 18:39:12 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Korchemsky",
"G. P.",
""
]
] | We consider elastic quark-quark scattering at high energy and fixed transferred momentum. Performing factorization of soft gluon exchanges into Wilson lines vacuum expectation values and studying their properties, we find that the asymptotics of the scattering amplitude is controlled by the renormalization properties of the so called cross singularities of Wilson loops. Using this fact, we evaluate the scattering amplitude and show that its asymptotics is determined by the properties of the $2\times 2$ matrix of anomalous dimensions which appears after one renormalizes the cross singularities of Wilson loops. A generalization to the case of quark-antiquark and gluon-gluon elastic scattering is discussed. |
1903.00698 | Aleksey Pivovarov | M. K. Volkov, Aleksey A. Pivovarov and K. Nurlan | The tetraquark $K_{1}(1400)$ in the decays $\tau \to [\omega(782),
\phi(1020)] K^{-} \nu_{\tau}$ | Another explanation of the nature of the physical state $K_{1}(1400)$
was found | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the extended Nambu--Jona-Lasinio model, the decay widths of the processes
$\tau \to [\omega(782), \phi(1020)] K^{-} \nu_{\tau}$ were calculated. The
intermediate strange quark-antiquark mesons in both the ground and the first
radially excited states were taken into account. The meson $K_{1}(1400)$, being
a possible candidate for the role of the tetraquark meson, was also taken into
account as an intermediate state. The result for the process $\tau \to
\omega(782) K^{-} \nu_{\tau}$ is in satisfactory agreement with the
experimental data. Simultaneously, the result for the decay $\tau \to
\phi(1020) K^{-} \nu_{\tau}$ is in agreement with the experimental data with
precision $1.3 \sigma$.
| [
{
"created": "Sat, 2 Mar 2019 13:21:42 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jun 2019 09:22:59 GMT",
"version": "v2"
}
] | 2019-06-26 | [
[
"Volkov",
"M. K.",
""
],
[
"Pivovarov",
"Aleksey A.",
""
],
[
"Nurlan",
"K.",
""
]
] | In the extended Nambu--Jona-Lasinio model, the decay widths of the processes $\tau \to [\omega(782), \phi(1020)] K^{-} \nu_{\tau}$ were calculated. The intermediate strange quark-antiquark mesons in both the ground and the first radially excited states were taken into account. The meson $K_{1}(1400)$, being a possible candidate for the role of the tetraquark meson, was also taken into account as an intermediate state. The result for the process $\tau \to \omega(782) K^{-} \nu_{\tau}$ is in satisfactory agreement with the experimental data. Simultaneously, the result for the decay $\tau \to \phi(1020) K^{-} \nu_{\tau}$ is in agreement with the experimental data with precision $1.3 \sigma$. |
1610.08196 | Ilya F. Ginzburg | I.F. Ginzburg | What tell us LHC data about Higgs boson parity | 4 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently CMS and ATLAS announced that they had measured the Higgs boson
parity. Here we note that their approach can determine this parity only under
the additional assumption that this particle has a definite parity.
If parity conservation is violated in the Higgs sector, the parity of
observed "Higgs" boson does not exist. The approach used in the mentioned
experiments does not allow to observe such opportunity. In this sense titles of
mentioned CMS and ATLAS publications are misleading.
| [
{
"created": "Wed, 26 Oct 2016 06:42:31 GMT",
"version": "v1"
}
] | 2016-10-27 | [
[
"Ginzburg",
"I. F.",
""
]
] | Recently CMS and ATLAS announced that they had measured the Higgs boson parity. Here we note that their approach can determine this parity only under the additional assumption that this particle has a definite parity. If parity conservation is violated in the Higgs sector, the parity of observed "Higgs" boson does not exist. The approach used in the mentioned experiments does not allow to observe such opportunity. In this sense titles of mentioned CMS and ATLAS publications are misleading. |
1006.2379 | Charles Gale | Simon Caron-Huot and Charles Gale | Finite-size effects on the radiative energy loss of a fast parton in hot
and dense strongly interacting matter | 15 pages, 7 figures, typos and references corrected. Clearer figures.
Harmonized with published version | Phys.Rev.C82:064902,2010 | 10.1103/PhysRevC.82.064902 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider finite-size effects on the radiative energy loss of a fast parton
moving in a finite temperature strongly interacting medium, using the light
cone path integral formalism put forward by Zakharov. We present a convenient
reformulation of the problem which makes possible its exact numerical analysis.
This is done by introducing the concept of a radiation rate in the presence of
finite-size effects. This effectively extends the finite-temperature approach
of AMY (Arnold, Moore, and Yaffe) to include interference between vacuum and
medium radiation. We compare results with those obtained in the regime
considered by AMY, with those obtained at leading order in an opacity
expansion, and with those obtained deep in the LPM (Landau-Pomeranchuk-Migdal)
regime.
| [
{
"created": "Fri, 11 Jun 2010 19:55:54 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Dec 2010 16:12:03 GMT",
"version": "v2"
}
] | 2010-12-24 | [
[
"Caron-Huot",
"Simon",
""
],
[
"Gale",
"Charles",
""
]
] | We consider finite-size effects on the radiative energy loss of a fast parton moving in a finite temperature strongly interacting medium, using the light cone path integral formalism put forward by Zakharov. We present a convenient reformulation of the problem which makes possible its exact numerical analysis. This is done by introducing the concept of a radiation rate in the presence of finite-size effects. This effectively extends the finite-temperature approach of AMY (Arnold, Moore, and Yaffe) to include interference between vacuum and medium radiation. We compare results with those obtained in the regime considered by AMY, with those obtained at leading order in an opacity expansion, and with those obtained deep in the LPM (Landau-Pomeranchuk-Migdal) regime. |
1605.08442 | Sebastian Macaluso | Aria Basirnia, Sebastian Macaluso and David Shih | Dark Matter and the Higgs in Natural SUSY | 37 pages, 15 figures, updated LUX limits | null | 10.1007/JHEP03(2017)073 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Null results from dark matter (DM) direct detection experiments and the 125
GeV Higgs both pose serious challenges to minimal supersymmetry. In this paper,
we propose a simple extension of the MSSM that economically solves both
problems: a "dark sector" consisting of a singlet and a pair of $SU(2)$
doublets. Loops of the dark sector fields help lift the Higgs mass to 125 GeV
consistent with naturalness, while the lightest fermion in the dark sector can
be viable thermal relic DM, provided that it is mostly singlet. The DM relic
abundance is controlled by s-wave annihilation to tops and Higgsinos, leading
to a tight relation between the relic abundance and the spin-dependent direct
detection cross section. As a result, the model will be fully probed by the
next generation of direct detection experiments. Finally we discuss the
discovery potential at LHC Run II.
| [
{
"created": "Thu, 26 May 2016 20:02:20 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Nov 2016 19:22:32 GMT",
"version": "v2"
}
] | 2017-04-05 | [
[
"Basirnia",
"Aria",
""
],
[
"Macaluso",
"Sebastian",
""
],
[
"Shih",
"David",
""
]
] | Null results from dark matter (DM) direct detection experiments and the 125 GeV Higgs both pose serious challenges to minimal supersymmetry. In this paper, we propose a simple extension of the MSSM that economically solves both problems: a "dark sector" consisting of a singlet and a pair of $SU(2)$ doublets. Loops of the dark sector fields help lift the Higgs mass to 125 GeV consistent with naturalness, while the lightest fermion in the dark sector can be viable thermal relic DM, provided that it is mostly singlet. The DM relic abundance is controlled by s-wave annihilation to tops and Higgsinos, leading to a tight relation between the relic abundance and the spin-dependent direct detection cross section. As a result, the model will be fully probed by the next generation of direct detection experiments. Finally we discuss the discovery potential at LHC Run II. |
hep-ph/0701253 | Kevin Dusling | Kevin Dusling and Ismail Zahed | Transverse momentum spectra of dileptons at NA60 | 10 pages, 5 figures | Phys.Rev.C80:014902,2009 | 10.1103/PhysRevC.80.014902 | null | hep-ph | null | Recently the NA60 collaboration has reported the transverse mass spectra of
dimuons coming from In-In collisions at 158 GeV/A. The measured yields display
a strong invariant mass dependence not typical of radial flow, suggesting that
different sources contribute in different mass regions. We interpret the dimuon
transverse mass spectra from an early thermalized partonic phase and hadronic
phase constrained by the strictures of broken chiral symmetry. Each phase
develops a specific transverse momentum dependence by hydrodynamical expansion.
We show that a measurement of the momentum anisotropy at NA60 could provide
information on the dominant emission source (hadronic or partonic) in the
intermediate mass region 1.5 <= M <= 3.0 GeV.
| [
{
"created": "Tue, 30 Jan 2007 18:45:18 GMT",
"version": "v1"
}
] | 2009-08-18 | [
[
"Dusling",
"Kevin",
""
],
[
"Zahed",
"Ismail",
""
]
] | Recently the NA60 collaboration has reported the transverse mass spectra of dimuons coming from In-In collisions at 158 GeV/A. The measured yields display a strong invariant mass dependence not typical of radial flow, suggesting that different sources contribute in different mass regions. We interpret the dimuon transverse mass spectra from an early thermalized partonic phase and hadronic phase constrained by the strictures of broken chiral symmetry. Each phase develops a specific transverse momentum dependence by hydrodynamical expansion. We show that a measurement of the momentum anisotropy at NA60 could provide information on the dominant emission source (hadronic or partonic) in the intermediate mass region 1.5 <= M <= 3.0 GeV. |
2012.06911 | Luigi Delle Rose | Luigi Delle Rose, Shaaban Khalil, Stefano Moretti | Explaining electron and muon $g-2$ anomalies in an Aligned 2-Higgs
Doublet Model with Right-Handed Neutrinos | 9 pages, 4 figures | null | 10.1016/j.physletb.2021.136216 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explain anomalies currently present in various data samples used for the
measurement of the anomalous magnetic moment of electron ($a_e$) and muon
($a_\mu$) in terms of an Aligned 2-Higgs Doublet Model with right-handed
neutrinos. The explanation is driven by one and two-loop topologies wherein a
very light CP-odd neutral Higgs state ($A$) contributes significantly to
$a_\mu$ but negligibly to $a_e$, so as to revert the sign of the new physics
corrections in the former case with respect to the latter, wherein the dominant
contribution is due to a charged Higgs boson ($H^\pm$) and heavy neutrinos with
mass at the electroweak scale. For the region of parameter space of our new
physics model which explains the aforementioned anomalies we also predict an
almost background-free smoking-gun signature of it, consisting of $H^\pm A$
production followed by Higgs boson decays yielding multi-$\tau$ final states,
which can be pursued at the Large Hadron Collider.
| [
{
"created": "Sat, 12 Dec 2020 22:19:47 GMT",
"version": "v1"
}
] | 2021-03-24 | [
[
"Rose",
"Luigi Delle",
""
],
[
"Khalil",
"Shaaban",
""
],
[
"Moretti",
"Stefano",
""
]
] | We explain anomalies currently present in various data samples used for the measurement of the anomalous magnetic moment of electron ($a_e$) and muon ($a_\mu$) in terms of an Aligned 2-Higgs Doublet Model with right-handed neutrinos. The explanation is driven by one and two-loop topologies wherein a very light CP-odd neutral Higgs state ($A$) contributes significantly to $a_\mu$ but negligibly to $a_e$, so as to revert the sign of the new physics corrections in the former case with respect to the latter, wherein the dominant contribution is due to a charged Higgs boson ($H^\pm$) and heavy neutrinos with mass at the electroweak scale. For the region of parameter space of our new physics model which explains the aforementioned anomalies we also predict an almost background-free smoking-gun signature of it, consisting of $H^\pm A$ production followed by Higgs boson decays yielding multi-$\tau$ final states, which can be pursued at the Large Hadron Collider. |
1909.09527 | Bj\"orn Herrmann | J. Branahl, J. Harz, B. Herrmann, M. Klasen, K. Kova\v{r}\'ik, S.
Schmiemann | SUSY-QCD corrected and Sommerfeld enhanced stau annihilation into heavy
quarks with scheme and scale uncertainties | 12 pages, 11 figures. Minor changes, matches published version | Phys. Rev. D 100, 115003 (2019) | 10.1103/PhysRevD.100.115003 | LAPTH-045/19, MS-TP-19-28, TUM-HEP-1226-19 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate stau-antistau annihilation into heavy quarks in the
phenomenological Minimal Supersymmetric Standard Model within the DM@NLO
project. We present the calculation of the corresponding cross section
including corrections up to $\mathcal{O}(\alpha_s)$ and QED Sommerfeld
enhancement. The numerical impact of these corrections is discussed for the
cross section and the dark matter relic density, where we focus on top-quark
final states and consider either neutralino or gravitino dark matter. Similarly
to previous work, we find that the presented corrections should be included
when calculating the relic density or extracting parameters from cosmological
observations. Considering scheme and scale variations, we estimate the
theoretical uncertainty that affects the prediction of the annihilation cross
section and thus the prediction of the relic density.
| [
{
"created": "Fri, 20 Sep 2019 14:29:06 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Nov 2019 17:15:53 GMT",
"version": "v2"
}
] | 2019-12-11 | [
[
"Branahl",
"J.",
""
],
[
"Harz",
"J.",
""
],
[
"Herrmann",
"B.",
""
],
[
"Klasen",
"M.",
""
],
[
"Kovařík",
"K.",
""
],
[
"Schmiemann",
"S.",
""
]
] | We investigate stau-antistau annihilation into heavy quarks in the phenomenological Minimal Supersymmetric Standard Model within the DM@NLO project. We present the calculation of the corresponding cross section including corrections up to $\mathcal{O}(\alpha_s)$ and QED Sommerfeld enhancement. The numerical impact of these corrections is discussed for the cross section and the dark matter relic density, where we focus on top-quark final states and consider either neutralino or gravitino dark matter. Similarly to previous work, we find that the presented corrections should be included when calculating the relic density or extracting parameters from cosmological observations. Considering scheme and scale variations, we estimate the theoretical uncertainty that affects the prediction of the annihilation cross section and thus the prediction of the relic density. |
hep-ph/0411096 | Giacomo Sguazzoni | Giacomo Sguazzoni | Higgs and Beyond Standard Model Searches at LEP | 10 pages, 7 figures, talk presented at Hadron Structure 2004,
Smolenice Castle, Slovakia | Acta Phys.Slov. 55 (2005) 93-102 | null | null | hep-ph | null | Extensive searches for Higgs bosons and other new phenomena predicted by
extensions of the Standard Model have been performed at LEP. A summary is given
reviewing the principal aspects and presenting a selection of results.
| [
{
"created": "Sat, 6 Nov 2004 00:37:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sguazzoni",
"Giacomo",
""
]
] | Extensive searches for Higgs bosons and other new phenomena predicted by extensions of the Standard Model have been performed at LEP. A summary is given reviewing the principal aspects and presenting a selection of results. |
1603.05808 | Samoil Bilenky M. | S. M. Bilenky | Comments on the determination of the neutrino mass ordering in reactor
neutrino experiments | null | null | 10.1134/S1547477117030050 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the problem of determination of the neutrino mass ordering via
precise study of the vacuum neutrino oscillations in the JUNO and other future
medium baseline reactor neutrino experiments. We are proposing to resolve
neutrino mass ordering by determination of the neutrino oscillation parameters
from analysis of the data of the reactor experiments and comparison them with
the oscillation parameters obtained from analysis of the solar and KamLAND
experiments.
| [
{
"created": "Fri, 18 Mar 2016 09:54:17 GMT",
"version": "v1"
}
] | 2017-06-07 | [
[
"Bilenky",
"S. M.",
""
]
] | We consider the problem of determination of the neutrino mass ordering via precise study of the vacuum neutrino oscillations in the JUNO and other future medium baseline reactor neutrino experiments. We are proposing to resolve neutrino mass ordering by determination of the neutrino oscillation parameters from analysis of the data of the reactor experiments and comparison them with the oscillation parameters obtained from analysis of the solar and KamLAND experiments. |
0706.1729 | Bruno Machet | Quentin Duret (LPTHE), Bruno Machet (LPTHE) | Mixing angles of quarks and leptons as an outcome of SU(2) horizontal
symmetries | While calculations are unchanged w.r.t. arXiv:0705.1237, the
horizontal symmetries controlling the mixing angles have been uncovered,
motivating a change of title and a new entry in the arXiv. A new point of
view about which angles are measured has also been adopted | null | null | null | hep-ph | null | We show that all mixing angles are determined, within experimental
uncertainty, by a product of SU(2) horizontal symmetries intimately linked to
the algebra of weak neutral currents. This concerns: on one hand, the three
quark mixing angles; on the other hand, a neutrino-like pattern in which
theta_{23} is maximal and tan (2 theta_{12}) = 2. The latter turns out to
exactly satisfy the ``quark-lepton complementarity condition'' theta_c +
theta_{12} = pi/4. Moreover, among all solutions, two values for the third
neutrino mixing angle arise, which satisfy the bound sin^2(theta_{13}) \leq
0.1: theta_{13} = +/- 5.7 10^{-3} and theta_{13} = +/- 0.2717.
| [
{
"created": "Tue, 12 Jun 2007 15:30:46 GMT",
"version": "v1"
}
] | 2007-06-13 | [
[
"Duret",
"Quentin",
"",
"LPTHE"
],
[
"Machet",
"Bruno",
"",
"LPTHE"
]
] | We show that all mixing angles are determined, within experimental uncertainty, by a product of SU(2) horizontal symmetries intimately linked to the algebra of weak neutral currents. This concerns: on one hand, the three quark mixing angles; on the other hand, a neutrino-like pattern in which theta_{23} is maximal and tan (2 theta_{12}) = 2. The latter turns out to exactly satisfy the ``quark-lepton complementarity condition'' theta_c + theta_{12} = pi/4. Moreover, among all solutions, two values for the third neutrino mixing angle arise, which satisfy the bound sin^2(theta_{13}) \leq 0.1: theta_{13} = +/- 5.7 10^{-3} and theta_{13} = +/- 0.2717. |
1209.0817 | Soeren Schlichting | J. Berges, S. Schlichting | The non-linear Glasma | 16 pages, 7 figures, to appear in Phys. Rev. D | null | 10.1103/PhysRevD.87.014026 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the evolution of quantum fluctuations in the Glasma created
immediately after the collision of heavy nuclei. It is shown how the presence
of instabilities leads to an enhancement of non-linear interactions among
initially small fluctuations. The non-linear dynamics leads to an enhanced
growth of fluctuations in a large momentum region exceeding by far the
originally unstable band. We investigate the dependence on the coupling
constant at weak coupling using classical statistical lattice simulations for
SU(2) gauge theory and show how these non-linearities can be analytically
understood within the framework of two-particle irreducible (2PI) effective
action techniques. The dependence on the coupling constant is only logarithmic
in accordance with analytic expectations. Concerning the isotropization of bulk
quantities, our results indicate that the system exhibits an order-one
anisotropy on parametrically large time scales. Despite this fact, we find that
gauge invariant pressure correlation functions seem to exhibit a power law
behavior characteristic for wave turbulence.
| [
{
"created": "Tue, 4 Sep 2012 22:15:59 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jan 2013 15:26:51 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Berges",
"J.",
""
],
[
"Schlichting",
"S.",
""
]
] | We study the evolution of quantum fluctuations in the Glasma created immediately after the collision of heavy nuclei. It is shown how the presence of instabilities leads to an enhancement of non-linear interactions among initially small fluctuations. The non-linear dynamics leads to an enhanced growth of fluctuations in a large momentum region exceeding by far the originally unstable band. We investigate the dependence on the coupling constant at weak coupling using classical statistical lattice simulations for SU(2) gauge theory and show how these non-linearities can be analytically understood within the framework of two-particle irreducible (2PI) effective action techniques. The dependence on the coupling constant is only logarithmic in accordance with analytic expectations. Concerning the isotropization of bulk quantities, our results indicate that the system exhibits an order-one anisotropy on parametrically large time scales. Despite this fact, we find that gauge invariant pressure correlation functions seem to exhibit a power law behavior characteristic for wave turbulence. |
hep-ph/0512025 | Massimiliano Grazzini | M. Grazzini | The transverse-momentum distribution of the Higgs boson at the LHC | 4 pages, 2 figures, to appear in the Proceedings of the International
Europhysics Conference on High Energy Physics, July 21st - 27th 2005, Lisboa,
Portugal | null | null | DFF 430/12/05 | hep-ph | null | We present QCD predictions for the transverse momentum (q_T) distribution of
the Higgs boson at the LHC. At small q_T the logarithmically-enhanced terms are
resummed to all orders up to next-to-next-to-leading logarithmic accuracy. The
resummed component is consistently matched to the next-to-leading order
calculation valid at large q_T. The results, which implement the most advanced
perturbative predictions available at present for this observable, show a good
stability with respect to theoretical uncertainties. The numerical program HqT,
used to perform the calculation, is briefly discussed.
| [
{
"created": "Fri, 2 Dec 2005 09:48:01 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Grazzini",
"M.",
""
]
] | We present QCD predictions for the transverse momentum (q_T) distribution of the Higgs boson at the LHC. At small q_T the logarithmically-enhanced terms are resummed to all orders up to next-to-next-to-leading logarithmic accuracy. The resummed component is consistently matched to the next-to-leading order calculation valid at large q_T. The results, which implement the most advanced perturbative predictions available at present for this observable, show a good stability with respect to theoretical uncertainties. The numerical program HqT, used to perform the calculation, is briefly discussed. |
hep-ph/0408024 | Shunzo Kumano | M. Hirai, S. Kumano, and N. Saito (Asymmetry Analysis Collaboration) | AAC analysis of polarized parton distributions with uncertainties | 4 pages, LaTeX, 4 eps files, dis04.cls, to be published in the
proceedings of the 12th International Workshop on Deep Inelastic Scattering
(DIS04), Strbske-Pleso, Slovakia, April 14-18, 2004. Polarized PDF library is
available at http://spin.riken.bnl.gov/aac/ | null | null | SAGA-HE-210-04 | hep-ph hep-ex nucl-ex nucl-th | null | We report recent studies of the Asymmetry Analysis Collaboration (AAC) on
polarized parton distribution functions (PDFs). Using the data on the spin
symmetry A_1 in deep inelastic lepton scattering, we investigate optimum
polarized PDFs. Their uncertainties are estimated by the Hessian method. The
uncertainties are large for the polarized antiquark and gluon distributions. We
discuss the role of accurate SLAC-E155 proton data on the determination of the
PDFs. The obtained distributions are compared with other parametrization
results.
| [
{
"created": "Tue, 3 Aug 2004 01:33:08 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hirai",
"M.",
"",
"Asymmetry Analysis Collaboration"
],
[
"Kumano",
"S.",
"",
"Asymmetry Analysis Collaboration"
],
[
"Saito",
"N.",
"",
"Asymmetry Analysis Collaboration"
]
] | We report recent studies of the Asymmetry Analysis Collaboration (AAC) on polarized parton distribution functions (PDFs). Using the data on the spin symmetry A_1 in deep inelastic lepton scattering, we investigate optimum polarized PDFs. Their uncertainties are estimated by the Hessian method. The uncertainties are large for the polarized antiquark and gluon distributions. We discuss the role of accurate SLAC-E155 proton data on the determination of the PDFs. The obtained distributions are compared with other parametrization results. |
hep-ph/0307318 | Sancho Moura Oliveira | S. M. Oliveira and R. Santos (CFTC, Univ. de Lisboa) | Bounds on the mass of the b' quark, revisited | 9 pages and 7 figures. REVTEX4 | Phys.Rev.D68:093012,2003 | 10.1103/PhysRevD.68.093012 | null | hep-ph | null | Recent results from the DELPHI collaboration led us to review the present
bounds on the b' quark mass. We use all available experimental data for m_b' >
96 GeV to constrain the b' quark mass as a function of the
Cabibbo-Kobayashi-Maskawa elements in a sequential four generations model. We
find that there is still room for a b' with a mass larger than 96 GeV.
| [
{
"created": "Fri, 25 Jul 2003 15:03:34 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Jul 2003 12:43:02 GMT",
"version": "v2"
}
] | 2011-03-23 | [
[
"Oliveira",
"S. M.",
"",
"CFTC, Univ. de Lisboa"
],
[
"Santos",
"R.",
"",
"CFTC, Univ. de Lisboa"
]
] | Recent results from the DELPHI collaboration led us to review the present bounds on the b' quark mass. We use all available experimental data for m_b' > 96 GeV to constrain the b' quark mass as a function of the Cabibbo-Kobayashi-Maskawa elements in a sequential four generations model. We find that there is still room for a b' with a mass larger than 96 GeV. |
hep-ph/0002104 | Adam Lewandowski | Adam Lewandowski | Constraints on a Model with Pure Right-Handed Third Generation Couplings | 14 pages | Phys.Rev. D62 (2000) 055007 | 10.1103/PhysRevD.62.055007 | JHU-TIPAC-200001 | hep-ph | null | We examine constraints on a model with pure right-handed third generation
charged couplings. The parameters of the right-handed mixing matrix and the
right-handed coupling strength are constrained from semi-leptonic B decays, the
mass difference of neutral mesons, the CP violating observables epsilon and
epsilon', and the electric dipole moment of the neutron. We find the model to
be tightly constrained by these parameters with several fine tuning conditions
on the phases in the right-handed mixing matrix. There is also a necessarily
non-zero value of the left and right W mixing parameter. CP asymmetry phases in
neutral B decays are discussed.
| [
{
"created": "Wed, 9 Feb 2000 18:50:33 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Lewandowski",
"Adam",
""
]
] | We examine constraints on a model with pure right-handed third generation charged couplings. The parameters of the right-handed mixing matrix and the right-handed coupling strength are constrained from semi-leptonic B decays, the mass difference of neutral mesons, the CP violating observables epsilon and epsilon', and the electric dipole moment of the neutron. We find the model to be tightly constrained by these parameters with several fine tuning conditions on the phases in the right-handed mixing matrix. There is also a necessarily non-zero value of the left and right W mixing parameter. CP asymmetry phases in neutral B decays are discussed. |
0805.3015 | Wei Khim Ng | Wei Khim Ng and Rajesh R. Parwani | Probing Quantum Nonlinearities through Neutrino Oscillations | null | Mod.Phys.Lett.A25:793-804,2010 | 10.1142/S0217732310032792 | null | hep-ph hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate potential quantum nonlinear corrections to Dirac's equation
through its sub-leading effect on neutrino oscillation probabilities. Working
in the plane-wave approximation and in the $\mu-\tau$ sector, we explore
various classes of nonlinearities, with or without an accompanying Lorentz
violation. The parameters in our models are first delimited by current
experimental data before they are used to estimate corrections to oscillation
probabilities. We find that only a small subset of the considered
nonlinearities have the potential to be relevant at higher energies and thus
possibly detectable in future experiments. A falsifiable prediction of our
models is an energy dependent effective mass-squared, generically involving
fractional powers of the energy.
| [
{
"created": "Tue, 20 May 2008 07:01:26 GMT",
"version": "v1"
},
{
"created": "Sat, 5 Feb 2011 06:37:27 GMT",
"version": "v2"
}
] | 2011-02-08 | [
[
"Ng",
"Wei Khim",
""
],
[
"Parwani",
"Rajesh R.",
""
]
] | We investigate potential quantum nonlinear corrections to Dirac's equation through its sub-leading effect on neutrino oscillation probabilities. Working in the plane-wave approximation and in the $\mu-\tau$ sector, we explore various classes of nonlinearities, with or without an accompanying Lorentz violation. The parameters in our models are first delimited by current experimental data before they are used to estimate corrections to oscillation probabilities. We find that only a small subset of the considered nonlinearities have the potential to be relevant at higher energies and thus possibly detectable in future experiments. A falsifiable prediction of our models is an energy dependent effective mass-squared, generically involving fractional powers of the energy. |
1908.11816 | Matthias Lutz F.M. | Yonggoo Heo, C. Kobdaj and M.F.M. Lutz | Constraints from a large-N_c analysis on meson-baryon interactions at
chiral order Q^3 | 24 pages | Phys. Rev. D 100, 094035 (2019) | 10.1103/PhysRevD.100.094035 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the chiral Lagrangian for baryon fields with J^P =\frac{1}{2}^+
or J^P =\frac{3}{2}^+ quantum numbers as constructed from QCD with up, down and
strange quarks. The specific class of counter terms that are of chiral order
Q^3 and contribute to meson-baryon interactions at the two-body level is
constructed. Altogether we find 24 terms. In order to pave the way for
realistic applications we establish a set of 22 sum rules for the low-energy
constants as they are implied by QCD in the large-N_c limit. Given such a
constraint there remain only 2 independent unknown parameters that need to be
determined by either Lattice QCD simulations or directly from experimental
cross section measurements. At subleading order we arrive at 5 parameters.
| [
{
"created": "Fri, 30 Aug 2019 16:14:40 GMT",
"version": "v1"
}
] | 2019-12-04 | [
[
"Heo",
"Yonggoo",
""
],
[
"Kobdaj",
"C.",
""
],
[
"Lutz",
"M. F. M.",
""
]
] | We consider the chiral Lagrangian for baryon fields with J^P =\frac{1}{2}^+ or J^P =\frac{3}{2}^+ quantum numbers as constructed from QCD with up, down and strange quarks. The specific class of counter terms that are of chiral order Q^3 and contribute to meson-baryon interactions at the two-body level is constructed. Altogether we find 24 terms. In order to pave the way for realistic applications we establish a set of 22 sum rules for the low-energy constants as they are implied by QCD in the large-N_c limit. Given such a constraint there remain only 2 independent unknown parameters that need to be determined by either Lattice QCD simulations or directly from experimental cross section measurements. At subleading order we arrive at 5 parameters. |
hep-ph/0006295 | Andrey Onishenko | A.I.Onishchenko (ITEP, Moscow) | Inclusive and exclusive decays of doubly heavy baryons | 8 pages, JHEP-class, 7 eps-figures, 5 tables, Talk given at Vth
International Workshop "HEAVY QUARK PHYSICS" April 6-8, 2000, Dubna, Russia | null | null | null | hep-ph | null | In this paper we give a short review of the recently obtained results on
inclusive and exclusive decays of doubly heavy baryons.
| [
{
"created": "Mon, 26 Jun 2000 18:01:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Onishchenko",
"A. I.",
"",
"ITEP, Moscow"
]
] | In this paper we give a short review of the recently obtained results on inclusive and exclusive decays of doubly heavy baryons. |
0912.5278 | Alexander E. Dorokhov | A.E. Dorokhov | How the recent BABAR data for P to \gamma\gamma* affect the Standard
Model predictions for the rare decays P to l+l- | 11 pages, 3 figures | JETP Lett.91:163-169,2010 | 10.1134/S0021364010040016 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Measuring the lepton anomalous magnetic moments $(g-2)$ and the rare decays
of light pseudoscalar mesons into lepton pairs $P\to l^{+}l^{-} $, serve as
important tests of the Standard Model. To reduce the theoretical uncertainty in
the standard model predictions, the data on the charge and transition form
factors of the light pseudoscalar mesons play a significant role. Recently, new
data on the behavior of the transition form factors $P\to\gamma\gamma* $ at
large momentum transfer were supplied by the BABAR collaboration. There are
several problems with the theoretical interpretation of these data: 1) An
unexpectedly slow decrease of the pion transition form factor at high momenta,
2) the qualitative difference in the behavior of the pion form factor and the
$\eta$ and $\eta^\prime$ form factors at high momenta, 3) the inconsistency of
the measured ratio of the $\eta$ and $\eta^\prime$ form factors with the
predicted one. We comment on the influence of the new BABAR data on the rare
decay branchings.
| [
{
"created": "Wed, 30 Dec 2009 14:06:14 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jan 2010 08:40:48 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Dorokhov",
"A. E.",
""
]
] | Measuring the lepton anomalous magnetic moments $(g-2)$ and the rare decays of light pseudoscalar mesons into lepton pairs $P\to l^{+}l^{-} $, serve as important tests of the Standard Model. To reduce the theoretical uncertainty in the standard model predictions, the data on the charge and transition form factors of the light pseudoscalar mesons play a significant role. Recently, new data on the behavior of the transition form factors $P\to\gamma\gamma* $ at large momentum transfer were supplied by the BABAR collaboration. There are several problems with the theoretical interpretation of these data: 1) An unexpectedly slow decrease of the pion transition form factor at high momenta, 2) the qualitative difference in the behavior of the pion form factor and the $\eta$ and $\eta^\prime$ form factors at high momenta, 3) the inconsistency of the measured ratio of the $\eta$ and $\eta^\prime$ form factors with the predicted one. We comment on the influence of the new BABAR data on the rare decay branchings. |
1211.1186 | Ilya Gorbunov N | Gennady Kozlov | Dilaton vs Higgs: Nearly Conformal theory with confinement-like pattern | 8 pages, 1 fig., Talk at the Conference "Quark Confinement and the
Hadron Spectrum X" (8-12 October, 2012, TUM Campus Garching, Munich, Germany)
to appear in the Proceedings | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the model containing a dilaton vs Higgs boson in the nearly
conformal sector (NCS). The potential of a dilaton in NCS is linearly rising
with distances. The light scalar dilaton would be one of the best candidates to
explain the LHC data in recent discovery of a Higgs-like resonance at 125 GeV.
| [
{
"created": "Tue, 6 Nov 2012 11:31:32 GMT",
"version": "v1"
}
] | 2012-11-07 | [
[
"Kozlov",
"Gennady",
""
]
] | We consider the model containing a dilaton vs Higgs boson in the nearly conformal sector (NCS). The potential of a dilaton in NCS is linearly rising with distances. The light scalar dilaton would be one of the best candidates to explain the LHC data in recent discovery of a Higgs-like resonance at 125 GeV. |
hep-ph/9706439 | Graciela Gelmini | J. A. Casas (CSIC, Spain) and G. B. Gelmini (UCLA, Usa) | Conditions for Viable Affleck-Dine Baryogenesis -- Implications for
String Theories | 13 pp., LaTex file | Phys.Lett. B410 (1997) 36-44 | 10.1016/S0370-2693(97)00971-4 | IEM-FT-157/97 and UCLA/97/TEP/15 | hep-ph | null | We examine the conditions for a viable Affleck-Dine baryogenesis in
supergravity (SUGRA) scenarios, finding surprisingly strong constraints on the
type of SUGRA theory. These constraints are beautifully fulfilled by
string-based SUGRA models provided that inflation is driven by a modulus (T)
field.
| [
{
"created": "Sat, 21 Jun 1997 00:44:35 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Casas",
"J. A.",
"",
"CSIC, Spain"
],
[
"Gelmini",
"G. B.",
"",
"UCLA, Usa"
]
] | We examine the conditions for a viable Affleck-Dine baryogenesis in supergravity (SUGRA) scenarios, finding surprisingly strong constraints on the type of SUGRA theory. These constraints are beautifully fulfilled by string-based SUGRA models provided that inflation is driven by a modulus (T) field. |
2301.07456 | Vinod Mamale | Shreyansh S. Dave, Sanatan Digal, Vinod Mamale | Parametric resonance in abelian and non-abelian gauge fields via
space-time oscillations | 22 pages, 21 figures | Phys. Rev. D 109, 076023 (2024) | 10.1103/PhysRevD.109.076023 | null | hep-ph astro-ph.HE gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We study the evolution of abelian $U(1)$ electromagnetic as well as
non-abelian $SU(2)$ gauge fields, in the presence of space-time oscillations.
Analysis of the time evolution of abelian gauge fields shows the presence of
parametric resonance in spatial modes. A similar analysis in the case of
non-abelian gauge fields, in the linear approximation, shows the presence of
the same resonant spatial modes. The resonant modes induce large fluctuations
in physical observables including those that break the $CP-$symmetry. We also
carry out time evolution of small random fluctuations of the gauge fields,
using numerical simulations in $2+1$ and $3+1$ dimensions. These simulations
help to study non-linear effects in the case of non-abelian gauge theories. Our
results show that there is an increase in energy density with the coupling, at
late times. These results suggest that gravitational waves may excite
non-abelian gauge fields more efficiently than electromagnetic fields. Also,
gravitational waves in the early Universe and from the merger of neutron stars,
black holes etc. may enhance $CP-$violation and generate an imbalance in chiral
charge distributions, magnetic fields etc.
| [
{
"created": "Wed, 18 Jan 2023 12:01:04 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Mar 2024 16:03:35 GMT",
"version": "v2"
}
] | 2024-04-26 | [
[
"Dave",
"Shreyansh S.",
""
],
[
"Digal",
"Sanatan",
""
],
[
"Mamale",
"Vinod",
""
]
] | We study the evolution of abelian $U(1)$ electromagnetic as well as non-abelian $SU(2)$ gauge fields, in the presence of space-time oscillations. Analysis of the time evolution of abelian gauge fields shows the presence of parametric resonance in spatial modes. A similar analysis in the case of non-abelian gauge fields, in the linear approximation, shows the presence of the same resonant spatial modes. The resonant modes induce large fluctuations in physical observables including those that break the $CP-$symmetry. We also carry out time evolution of small random fluctuations of the gauge fields, using numerical simulations in $2+1$ and $3+1$ dimensions. These simulations help to study non-linear effects in the case of non-abelian gauge theories. Our results show that there is an increase in energy density with the coupling, at late times. These results suggest that gravitational waves may excite non-abelian gauge fields more efficiently than electromagnetic fields. Also, gravitational waves in the early Universe and from the merger of neutron stars, black holes etc. may enhance $CP-$violation and generate an imbalance in chiral charge distributions, magnetic fields etc. |
hep-ph/9911337 | Oscar Vives | D.A. Demir (1), A. Masiero (2) and O. Vives (2), ((1) ICTP, Trieste,
(2) SISSA-ISAS and INFN, Trieste) | CP violation as a probe of flavor origin in Supersymmetry | Reference added. 7 pages, no figures | Phys.Lett. B479 (2000) 230-234 | 10.1016/S0370-2693(00)00321-X | SISSA/134/99/EP, IC/99/165 | hep-ph | null | We address the question of the relation between supersymmetry breaking and
the origin of flavor in the context of CP violating phenomena. We prove that,
in the absence of the Cabibbo-Kobayashi-Maskawa phase, a general Minimal
Supersymmetric Standard Model with all possible phases in the soft-breaking
terms, but no new flavor structure beyond the usual Yukawa matrices, can never
give a sizeable contribution to $\epsilon_K$, $\epsilon^\prime/\epsilon$ or
hadronic $B^0$ CP asymmetries. Observation of supersymmetric contributions to
CP asymmetries in B decays would hint at a non-flavor blind mechanism of
supersymmetry breaking.
| [
{
"created": "Fri, 12 Nov 1999 18:32:56 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Feb 2000 17:48:42 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Demir",
"D. A.",
""
],
[
"Masiero",
"A.",
""
],
[
"Vives",
"O.",
""
]
] | We address the question of the relation between supersymmetry breaking and the origin of flavor in the context of CP violating phenomena. We prove that, in the absence of the Cabibbo-Kobayashi-Maskawa phase, a general Minimal Supersymmetric Standard Model with all possible phases in the soft-breaking terms, but no new flavor structure beyond the usual Yukawa matrices, can never give a sizeable contribution to $\epsilon_K$, $\epsilon^\prime/\epsilon$ or hadronic $B^0$ CP asymmetries. Observation of supersymmetric contributions to CP asymmetries in B decays would hint at a non-flavor blind mechanism of supersymmetry breaking. |
2003.14293 | Giuseppe Bevilacqua | Giuseppe Bevilacqua | Effects of top-quark decay modeling in $t\bar{t}\gamma$ production at
the LHC | 13 pages, 1 table, 3 figures. To appear in the Proceedings of the
XXVI Cracow Epiphany Conference on LHC Physics: Standard Model and Beyond,
7-10 January 2020, Cracow, Poland | null | 10.5506/APhysPolB.51.1267 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a systematic comparison of different approaches for the modeling
of $t\bar{t}\gamma$ final states with leptonic decays at the LHC. On the one
hand, we consider a complete calculation at NLO QCD accuracy which includes all
resonant and non-resonant diagrams. On the other hand, we consider predictions
in the narrow-width approximation with top quark decays modeled at various
accuracies. In this way we quantify the impact of the off-shell effects in
$t\bar{t}\gamma$ production. We also discuss the relative importance of
double-, single- and non-resonant contributions in the complete calculation.
Finally we investigate the fraction of isolated photons from decays of top
quarks, which represent a background for measurements of anomalous $t\gamma$
couplings.
| [
{
"created": "Tue, 31 Mar 2020 15:29:39 GMT",
"version": "v1"
}
] | 2020-08-26 | [
[
"Bevilacqua",
"Giuseppe",
""
]
] | We present a systematic comparison of different approaches for the modeling of $t\bar{t}\gamma$ final states with leptonic decays at the LHC. On the one hand, we consider a complete calculation at NLO QCD accuracy which includes all resonant and non-resonant diagrams. On the other hand, we consider predictions in the narrow-width approximation with top quark decays modeled at various accuracies. In this way we quantify the impact of the off-shell effects in $t\bar{t}\gamma$ production. We also discuss the relative importance of double-, single- and non-resonant contributions in the complete calculation. Finally we investigate the fraction of isolated photons from decays of top quarks, which represent a background for measurements of anomalous $t\gamma$ couplings. |
1502.06767 | Carlos Merino | G.H. Arakelyan, C. Merino, and Yu.M. Shabelski | Midrapidity Hyperon Production in pp and pA Collisions | Proceedings of Initial Stages 2014 Conference (6 pages, 2 figures,
and 2 tables) | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we present the description of the production of strange and
mulistrange baryons in a wide energy region, from CERN SpS up to LHC, in the
framework of the Quark-Gluon String model.
| [
{
"created": "Tue, 24 Feb 2015 11:24:21 GMT",
"version": "v1"
}
] | 2015-02-25 | [
[
"Arakelyan",
"G. H.",
""
],
[
"Merino",
"C.",
""
],
[
"Shabelski",
"Yu. M.",
""
]
] | In this paper we present the description of the production of strange and mulistrange baryons in a wide energy region, from CERN SpS up to LHC, in the framework of the Quark-Gluon String model. |
2211.00022 | Jonas Frerick | Jonas Frerick, Felix Kahlhoefer, Kai Schmidt-Hoberg | $A'$ view of the sunrise: Boosting helioscopes with angular information | 29 pages, 14 figures | null | 10.1088/1475-7516/2023/03/001 | DESY-22-165, TTP22-065 | hep-ph astro-ph.SR | http://creativecommons.org/licenses/by/4.0/ | The Sun may copiously produce hypothetical light particles such as axions or
dark photons, a scenario which can be experimentally probed with so-called
helioscopes. Here we investigate the impact of the angular and spectral
distribution of solar dark photons on the sensitivity of such instruments. For
the first time we evaluate this spectral and angular dependence of the dark
photon flux over the whole mass range and apply this information to existing
data from the Hinode Solar X-Ray Telescope. Specifically we use calibration
images for a classical helioscope analysis as well as data from a solar eclipse
providing sensitivity to exceptionally large oscillation lengths. We
demonstrate that exploiting the signal features can boost the constraints by
more than one order of magnitude in terms of the mixing parameter compared to a
naive counting experiment.
| [
{
"created": "Mon, 31 Oct 2022 18:00:02 GMT",
"version": "v1"
}
] | 2023-03-08 | [
[
"Frerick",
"Jonas",
""
],
[
"Kahlhoefer",
"Felix",
""
],
[
"Schmidt-Hoberg",
"Kai",
""
]
] | The Sun may copiously produce hypothetical light particles such as axions or dark photons, a scenario which can be experimentally probed with so-called helioscopes. Here we investigate the impact of the angular and spectral distribution of solar dark photons on the sensitivity of such instruments. For the first time we evaluate this spectral and angular dependence of the dark photon flux over the whole mass range and apply this information to existing data from the Hinode Solar X-Ray Telescope. Specifically we use calibration images for a classical helioscope analysis as well as data from a solar eclipse providing sensitivity to exceptionally large oscillation lengths. We demonstrate that exploiting the signal features can boost the constraints by more than one order of magnitude in terms of the mixing parameter compared to a naive counting experiment. |
0904.4025 | Kuang-Ta Chao | Ying Fan, Yan-Qing Ma, Kuang-Ta Chao | Relativistic Correction to J/\psi Production at Hadron Colliders | 9 pages, 5 figures | Phys.Rev.D79:114009,2009 | 10.1103/PhysRevD.79.114009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Relativistic corrections to the color-singlet J/\psi hadroproduction at the
Tevatron and LHC are calculated up to O(v^2) in nonrelativistic QCD (NRQCD).
The short distance coefficients are obtained by matching full QCD with NRQCD
results for the subprocess g+g\to J/\psi+g. The long distance matrix elements
are extracted from observed J/\psi hadronic and leptonic decay widths up to
O}(v^2). Using the CTEQ6 parton distribution functions, we calculate the LO
production cross sections and relativistic corrections for the process
p+\bar{p}(p)\to J/\psi+X at the Tevatron and LHC. We find that the enhancement
of O(v^2) relativistic corrections to the cross sections over a wide range of
large transverse momentum p_t is negligible, only at a level of about 1 %. This
tiny effect is due to the smallness of the correction to short distance
coefficients and the suppression from long distance matrix elements. These
results indicate that relativistic corrections can not help to resolve the
large discrepancy between leading order prediction and experimental data for
J/\psi production at the Tevatron.
| [
{
"created": "Sun, 26 Apr 2009 13:44:24 GMT",
"version": "v1"
}
] | 2009-11-19 | [
[
"Fan",
"Ying",
""
],
[
"Ma",
"Yan-Qing",
""
],
[
"Chao",
"Kuang-Ta",
""
]
] | Relativistic corrections to the color-singlet J/\psi hadroproduction at the Tevatron and LHC are calculated up to O(v^2) in nonrelativistic QCD (NRQCD). The short distance coefficients are obtained by matching full QCD with NRQCD results for the subprocess g+g\to J/\psi+g. The long distance matrix elements are extracted from observed J/\psi hadronic and leptonic decay widths up to O}(v^2). Using the CTEQ6 parton distribution functions, we calculate the LO production cross sections and relativistic corrections for the process p+\bar{p}(p)\to J/\psi+X at the Tevatron and LHC. We find that the enhancement of O(v^2) relativistic corrections to the cross sections over a wide range of large transverse momentum p_t is negligible, only at a level of about 1 %. This tiny effect is due to the smallness of the correction to short distance coefficients and the suppression from long distance matrix elements. These results indicate that relativistic corrections can not help to resolve the large discrepancy between leading order prediction and experimental data for J/\psi production at the Tevatron. |
hep-ph/0110077 | Misha Stephanov | M. Stephanov | Thermal fluctuations in the interacting pion gas | 12 pages, 4 figures, RevTeX | Phys.Rev. D65 (2002) 096008 | 10.1103/PhysRevD.65.096008 | null | hep-ph nucl-th | null | We derive the two-particle fluctuation correlator in a thermal gas of
pi-mesons to the lowest order in an interaction due to a resonance exchange. A
diagrammatic technique is used. We discuss how this result can be applied to
event-by-event fluctuations in heavy-ion collisions, in particular, to search
for the critical point of QCD. As a practical example, we determine the shape
of the rapidity correlator.
| [
{
"created": "Fri, 5 Oct 2001 17:58:39 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Stephanov",
"M.",
""
]
] | We derive the two-particle fluctuation correlator in a thermal gas of pi-mesons to the lowest order in an interaction due to a resonance exchange. A diagrammatic technique is used. We discuss how this result can be applied to event-by-event fluctuations in heavy-ion collisions, in particular, to search for the critical point of QCD. As a practical example, we determine the shape of the rapidity correlator. |
hep-ph/0512067 | Tobias Huber | T. Huber, S. Schilling | B -> X_s l+ l- in the Standard Model and in Two-Higgs-Doublet Models | 9 pages, 2 Figures, uses moriond.sty. Presented at 40th Rencontres de
Moriond on QCD and High Energy Hadronic Interactions, La Thuile, Aosta
Valley, Italy, 12-19 Mar 2005 | null | null | null | hep-ph | null | We present recent results of the rare semileptonic decay B -> X_s l+ l-. We
particularly focus on higher order electroweak corrections in the Standard
Model (SM) as well as O(alpha_s) corrections in Two-Higgs-doublet models
(THDM), both of which are computed within an effective field theory approach.
The calculation of higher order electroweak corrections reveals the presence
of enhanced electromagnetic logarithms log(m_b^2/m_l^2) in the differential
branching ratio. The inclusion of O(alpha_s) in the THDM reduces the scale
dependence of the corresponding Wilson coefficients significantly.
| [
{
"created": "Mon, 5 Dec 2005 18:45:17 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Huber",
"T.",
""
],
[
"Schilling",
"S.",
""
]
] | We present recent results of the rare semileptonic decay B -> X_s l+ l-. We particularly focus on higher order electroweak corrections in the Standard Model (SM) as well as O(alpha_s) corrections in Two-Higgs-doublet models (THDM), both of which are computed within an effective field theory approach. The calculation of higher order electroweak corrections reveals the presence of enhanced electromagnetic logarithms log(m_b^2/m_l^2) in the differential branching ratio. The inclusion of O(alpha_s) in the THDM reduces the scale dependence of the corresponding Wilson coefficients significantly. |
hep-ph/0310296 | Tetsuo Nishikawa | Tetsuo Nishikawa, Yoshimasa Hidaka, Munehisa Ohtani and Osamu
Morimatsu | Effect of pion thermal width on the sigma spectrum | Contribution to the International Workshop on QCD: QCD@Work 2003 -
Conversano (Italy) 14-18 June 2003 (eConf C030614) | null | null | null | hep-ph | null | We study the effect of the thermal width of $\pi$ on the spectral function of
$\sigma$. In order to take into account a finite thermal width of $\pi$, we
replace the internal pion mass in the self-energy of $\sigma$ with that of the
complex pole found in a previous paper. The obtained spectral function for
$T\aplg 100 {\rm MeV}$ turns out to possess two broad peaks. Although a sharp
peak at $\sigma\to\pi\pi$ threshold was observed in the one-loop calculation
without the pion thermal width, the peak is shown to be smeared out. We also
search for the poles of the $\sigma$ propagator and analyze the behavior of the
spectral function with these poles.
| [
{
"created": "Mon, 27 Oct 2003 09:22:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nishikawa",
"Tetsuo",
""
],
[
"Hidaka",
"Yoshimasa",
""
],
[
"Ohtani",
"Munehisa",
""
],
[
"Morimatsu",
"Osamu",
""
]
] | We study the effect of the thermal width of $\pi$ on the spectral function of $\sigma$. In order to take into account a finite thermal width of $\pi$, we replace the internal pion mass in the self-energy of $\sigma$ with that of the complex pole found in a previous paper. The obtained spectral function for $T\aplg 100 {\rm MeV}$ turns out to possess two broad peaks. Although a sharp peak at $\sigma\to\pi\pi$ threshold was observed in the one-loop calculation without the pion thermal width, the peak is shown to be smeared out. We also search for the poles of the $\sigma$ propagator and analyze the behavior of the spectral function with these poles. |
2007.09897 | C. Q. Geng | Chao-Qiang Geng, Chia-Wei Liu, Tien-Hsueh Tsai | Nonleptonic two-body weak decays of $\Lambda_b$ in modified MIT bag
model | 16 pages, no figure, revised version accepted by PRD | Phys. Rev. D 102, 034033 (2020) | 10.1103/PhysRevD.102.034033 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the nonleptonic two-body weak decays of $\Lambda_b$ by modifying the
MIT bag model without introducing new parameters to construct the momentum
eigenstates of the baryons. We find that the branching ratios of $\Lambda_b^0
\to \Lambda_c^+ \pi^-$, $\Lambda_c^+ K^-$, $p \pi^-$ and $pK^-$ are
$(4.5\pm0.2)\times 10^{-3}$, $(3.4\pm 0.1)\times 10^{-4}$, $(5.0\pm 0.5)\times
10^{-6}$ and $(6.0\pm 0.7) \times 10^{-6}$, which are all well consistent with
the current experimental data, respectively. We also explore P and CP
asymmetries for the decays of $\Lambda_b^0 \to p (\pi^-,K^-)$. In particular,
we obtain that the direct CP-violating rate asymmetries in $\Lambda_b^0 \to p
\pi^-$ and $\Lambda_b^0 \to p K^-$ are around $-4.4\%$ and $6.7\%$, in
comparison with $(-2.5\pm2.9)\%$ and $(-2.5\pm2.2)\%$ from the Particle Data
Group in 2020, respectively.
| [
{
"created": "Mon, 20 Jul 2020 05:53:39 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Aug 2020 04:58:35 GMT",
"version": "v2"
}
] | 2020-09-02 | [
[
"Geng",
"Chao-Qiang",
""
],
[
"Liu",
"Chia-Wei",
""
],
[
"Tsai",
"Tien-Hsueh",
""
]
] | We study the nonleptonic two-body weak decays of $\Lambda_b$ by modifying the MIT bag model without introducing new parameters to construct the momentum eigenstates of the baryons. We find that the branching ratios of $\Lambda_b^0 \to \Lambda_c^+ \pi^-$, $\Lambda_c^+ K^-$, $p \pi^-$ and $pK^-$ are $(4.5\pm0.2)\times 10^{-3}$, $(3.4\pm 0.1)\times 10^{-4}$, $(5.0\pm 0.5)\times 10^{-6}$ and $(6.0\pm 0.7) \times 10^{-6}$, which are all well consistent with the current experimental data, respectively. We also explore P and CP asymmetries for the decays of $\Lambda_b^0 \to p (\pi^-,K^-)$. In particular, we obtain that the direct CP-violating rate asymmetries in $\Lambda_b^0 \to p \pi^-$ and $\Lambda_b^0 \to p K^-$ are around $-4.4\%$ and $6.7\%$, in comparison with $(-2.5\pm2.9)\%$ and $(-2.5\pm2.2)\%$ from the Particle Data Group in 2020, respectively. |
hep-ph/9710374 | Basim Kamal | B. Kamal (Brookhaven) | Drell-Yan forward-backward and spin asymmetries for arbitrary vector
boson production at next-to-leading order | 34 pages, figures included, revtex. Some discussions and references
added/modified. In more compact form. To appear in Phys. Rev. D | Phys.Rev. D57 (1998) 6663-6691 | 10.1103/PhysRevD.57.6663 | BNL-64853 | hep-ph | null | Longitudinally polarized, unpolarized and forward-backward mass differential
cross sections for Drell-Yan lepton-pair production by arbitrary vector bosons
are calculated in next-to-leading order (NLO) QCD. Analytical results are
presented in a form valid for all consistent $n$-dimensional regularization
schemes, with the mass factorization scheme kept general. NLO predictions for
all Drell-Yan type processes ($W^\pm$, $Z$ and $\gamma^*$) at BNL's
relativistic heavy ion collider (RHIC) are made using polarized parton
distributions which fit the recent deep-inelastic scattering data. These are
examined as tools in the determination of the polarized parton distributions
and the unpolarized $\bar{u}/\bar{d}$ ratio. NLO predictions for the
forward-backward lepton asymmetry at Fermilab are made and the precision
determination of $\sin^2 \theta_W$ from future runs is studied. In all the
above, the QCD corrections are found to be significant. An introductory
discussion is given of various theoretical issues, such as allowable
factorization and regularization schemes, and scale dependences.
| [
{
"created": "Thu, 16 Oct 1997 07:12:56 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Mar 1998 01:26:46 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Kamal",
"B.",
"",
"Brookhaven"
]
] | Longitudinally polarized, unpolarized and forward-backward mass differential cross sections for Drell-Yan lepton-pair production by arbitrary vector bosons are calculated in next-to-leading order (NLO) QCD. Analytical results are presented in a form valid for all consistent $n$-dimensional regularization schemes, with the mass factorization scheme kept general. NLO predictions for all Drell-Yan type processes ($W^\pm$, $Z$ and $\gamma^*$) at BNL's relativistic heavy ion collider (RHIC) are made using polarized parton distributions which fit the recent deep-inelastic scattering data. These are examined as tools in the determination of the polarized parton distributions and the unpolarized $\bar{u}/\bar{d}$ ratio. NLO predictions for the forward-backward lepton asymmetry at Fermilab are made and the precision determination of $\sin^2 \theta_W$ from future runs is studied. In all the above, the QCD corrections are found to be significant. An introductory discussion is given of various theoretical issues, such as allowable factorization and regularization schemes, and scale dependences. |
hep-ph/9304239 | null | U. Baur, S. Errede, and J. Ohnemus | Ratios of $W^\pm\gamma$ and $Z\gamma$ Cross Sections: New Tools in
Probing the Weak Boson Sector at the Tevatron | TeX, 39 pages, FSU-HEP-930322, UIUC-HEP-93-01, DTP/93/14, 15 Figures
(uuencoded tar file, postscript) appended | Phys.Rev. D48 (1993) 4103-4120 | 10.1103/PhysRevD.48.4103 | null | hep-ph | null | The ratios ${\cal R}_{\gamma ,\ell}=B(Z\to\ell^+\ell^-)\cdot\sigma(Z\gamma)
/\allowbreak B(W\to\ell\nu)\cdot\sigma(W^\pm\gamma)$, ${\cal R}_{\gamma , \nu}=
B(Z\to\bar\nu\nu)\cdot\sigma(Z\gamma)/\allowbreak B(W\to\ell\nu)\cdot\sigma(W^
\pm\gamma)$, ${\cal R}_{W\gamma}=\sigma(W^\pm\gamma)/\allowbreak\sigma(W^\pm)$,
and ${\cal R}_{Z\gamma}=\sigma(Z\gamma)/\allowbreak\sigma(Z)$ are studied as
tools to probe the electroweak boson self-interactions. As a function of the
minimum photon transverse momentum, ${\cal R}_{\gamma ,\ell}$ and ${\cal R}_{
\gamma ,\nu}$ are found to directly reflect the radiation zero present in $W^
\pm\gamma$ production in the Standard Model. All four ratios are sensitive to
anomalous $WW\gamma$ and/or $ZZ\gamma/Z\gamma\gamma$ couplings. The sensitivity
of the cross section ratios to the cuts imposed on the final state particles,
as well as the systematic uncertainties resulting from different
parametrizations of parton distribution functions, the choice of the
factorization scale $Q^2$, and from higher order QCD corrections are explored.
Taking into account these uncertainties, sensitivity limits for anomalous three
gauge boson couplings, based on a measurement of the cross section ratios with
an integrated luminosity of 25~pb$^{-1}$ at the Tevatron, are estimated.
| [
{
"created": "Thu, 8 Apr 1993 20:57:31 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Baur",
"U.",
""
],
[
"Errede",
"S.",
""
],
[
"Ohnemus",
"J.",
""
]
] | The ratios ${\cal R}_{\gamma ,\ell}=B(Z\to\ell^+\ell^-)\cdot\sigma(Z\gamma) /\allowbreak B(W\to\ell\nu)\cdot\sigma(W^\pm\gamma)$, ${\cal R}_{\gamma , \nu}= B(Z\to\bar\nu\nu)\cdot\sigma(Z\gamma)/\allowbreak B(W\to\ell\nu)\cdot\sigma(W^ \pm\gamma)$, ${\cal R}_{W\gamma}=\sigma(W^\pm\gamma)/\allowbreak\sigma(W^\pm)$, and ${\cal R}_{Z\gamma}=\sigma(Z\gamma)/\allowbreak\sigma(Z)$ are studied as tools to probe the electroweak boson self-interactions. As a function of the minimum photon transverse momentum, ${\cal R}_{\gamma ,\ell}$ and ${\cal R}_{ \gamma ,\nu}$ are found to directly reflect the radiation zero present in $W^ \pm\gamma$ production in the Standard Model. All four ratios are sensitive to anomalous $WW\gamma$ and/or $ZZ\gamma/Z\gamma\gamma$ couplings. The sensitivity of the cross section ratios to the cuts imposed on the final state particles, as well as the systematic uncertainties resulting from different parametrizations of parton distribution functions, the choice of the factorization scale $Q^2$, and from higher order QCD corrections are explored. Taking into account these uncertainties, sensitivity limits for anomalous three gauge boson couplings, based on a measurement of the cross section ratios with an integrated luminosity of 25~pb$^{-1}$ at the Tevatron, are estimated. |
0901.2208 | Dmitri Kazakov | D.I.Kazakov | Radiative Corrections, Divergences, Regularization, Renormalization,
Renormalization Group and All That in Examples in Quantum Field Theory | Lectures, 91 pages, 46 figures, Russian version can be found at
http://theor.jinr.ru/~kazakovd | null | null | JINR, UC-2008-34 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present lectures are a practical guide to the calculation of radiative
corrections to the Green functions in quantum field theory. The appearance of
ultraviolet divergences is explained, their classification is given, the
renormalization procedure which allows one to get the finite results is
described, and the basis of the renormalization group in QFT is presented.
Numerous examples of calculations in scalar and gauge theories are given.
Quantum anomalies are discussed. In conclusion the procedure which allows one
to get rid of infrared divergences in S-matrix elements is described. The
lectures are based on the standard quantum field theory textbooks, the list of
which is given at the end of the text.
These lectures were given to the 4-th year students of the Department of
General and Applied Physics of the Moscow Institute of Physics and Technology
(Technical University).
| [
{
"created": "Thu, 15 Jan 2009 09:49:15 GMT",
"version": "v1"
}
] | 2009-01-16 | [
[
"Kazakov",
"D. I.",
""
]
] | The present lectures are a practical guide to the calculation of radiative corrections to the Green functions in quantum field theory. The appearance of ultraviolet divergences is explained, their classification is given, the renormalization procedure which allows one to get the finite results is described, and the basis of the renormalization group in QFT is presented. Numerous examples of calculations in scalar and gauge theories are given. Quantum anomalies are discussed. In conclusion the procedure which allows one to get rid of infrared divergences in S-matrix elements is described. The lectures are based on the standard quantum field theory textbooks, the list of which is given at the end of the text. These lectures were given to the 4-th year students of the Department of General and Applied Physics of the Moscow Institute of Physics and Technology (Technical University). |
1111.5813 | Elliot Leader | Elliot Leader | Reply to the comment of Huey-Wen Lin and Keh-Fei Liu on "Controversy
concerning the definition of quark and gluon angular momentum" by E. Leader
(arXiv:1111.0678, PRD 83, 096012 (2011)) | 2 pages, no figures | null | 10.1103/PhysRevD.85.058902 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lin and Liu evaluate the nucleon expectation value of the non gauge-invariant
canonical quark momentum operator on a lattice, and obtain zero. They conclude
that my argument that, despite the non gauge-invariance of the operator, its
physical matrix elements \emph{are} gauge-invariant, cannot be correct. I show
that their result has no bearing on the question of gauge-invariance, and also
point to an amusing lattice paradox.
| [
{
"created": "Thu, 24 Nov 2011 16:33:54 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Leader",
"Elliot",
""
]
] | Lin and Liu evaluate the nucleon expectation value of the non gauge-invariant canonical quark momentum operator on a lattice, and obtain zero. They conclude that my argument that, despite the non gauge-invariance of the operator, its physical matrix elements \emph{are} gauge-invariant, cannot be correct. I show that their result has no bearing on the question of gauge-invariance, and also point to an amusing lattice paradox. |
hep-ph/9912314 | Gayane A. Amatuni | N.A. Korkhmazyan (Armenian Pedagogical Institute), N.N. Korkhmazyan
(Armenian Pedagogical Institute) | On Quark-Lepton Symmetry | 5 pages, 1 figure | null | null | null | hep-ph | null | The new quantum number is introduced. It is shown that the conservation of
-number results in the conservation of difference between baryon and lepton
numbers. The problem of quark-lepton symmetry is discussed. It is shown that
the nature of quark-lepton symmetry stems from the fact that the particles of
one generation are subject to the symmetry transformation represented by
4-group of diedr.
| [
{
"created": "Sun, 12 Dec 1999 21:41:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Korkhmazyan",
"N. A.",
"",
"Armenian Pedagogical Institute"
],
[
"Korkhmazyan",
"N. N.",
"",
"Armenian Pedagogical Institute"
]
] | The new quantum number is introduced. It is shown that the conservation of -number results in the conservation of difference between baryon and lepton numbers. The problem of quark-lepton symmetry is discussed. It is shown that the nature of quark-lepton symmetry stems from the fact that the particles of one generation are subject to the symmetry transformation represented by 4-group of diedr. |
hep-ph/0010160 | Alessandro Papa | R. Fiore, L.L. Jenkovszky, E.A. Kuraev, A.I. Lengyel, F. Paccanoni, A.
Papa | Finite sum of gluon ladders and high energy cross sections | 18 pages, LaTeX, 2 EPS figures, uses axodraw.sty | Phys.Rev. D63 (2001) 056010 | 10.1103/PhysRevD.63.056010 | DFPD 00/TH/48, UNICAL-TH 00/7 | hep-ph | null | A model for the Pomeron at $t=0$ is suggested. It is based on the idea of a
finite sum of ladder diagrams in QCD. Accordingly, the number of $s$-channel
gluon rungs and correspondingly the powers of logarithms in the forward
scattering amplitude depends on the phase space (energy) available, i.e. as
energy increases, progressively new prongs with additional gluon rungs in the
$s$-channel open. Explicit expressions for the total cross section involving
two and three rungs or, alternatively, three and four prongs (with $\ln^2(s)$
and $\ln^3(s)$ as highest terms, respectively) are fitted to the proton-proton
and proton-antiproton total cross section data in the accelerator region. Both
QCD calculation and fits to the data indicate fast convergence of the series.
In the fit, two terms (a constant and a logarithmically rising one) almost
saturate the whole series, the $\ln^2(s)$ term being small and the next one,
$\ln^3(s)$, negligible. Theoretical predictions for the photon-photon total
cross section are also given.
| [
{
"created": "Mon, 16 Oct 2000 09:59:21 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Fiore",
"R.",
""
],
[
"Jenkovszky",
"L. L.",
""
],
[
"Kuraev",
"E. A.",
""
],
[
"Lengyel",
"A. I.",
""
],
[
"Paccanoni",
"F.",
""
],
[
"Papa",
"A.",
""
]
] | A model for the Pomeron at $t=0$ is suggested. It is based on the idea of a finite sum of ladder diagrams in QCD. Accordingly, the number of $s$-channel gluon rungs and correspondingly the powers of logarithms in the forward scattering amplitude depends on the phase space (energy) available, i.e. as energy increases, progressively new prongs with additional gluon rungs in the $s$-channel open. Explicit expressions for the total cross section involving two and three rungs or, alternatively, three and four prongs (with $\ln^2(s)$ and $\ln^3(s)$ as highest terms, respectively) are fitted to the proton-proton and proton-antiproton total cross section data in the accelerator region. Both QCD calculation and fits to the data indicate fast convergence of the series. In the fit, two terms (a constant and a logarithmically rising one) almost saturate the whole series, the $\ln^2(s)$ term being small and the next one, $\ln^3(s)$, negligible. Theoretical predictions for the photon-photon total cross section are also given. |
hep-ph/0111187 | Marcus Bleicher | M. Bleicher, F. M. Liu, A. Ker\"anen, J. Aichelin, S.A. Bass, F.
Becattini, K. Redlich, K. Werner | Overpopulation of $\bar \Omega$ in pp collisions: a way to distinguish
statistical hadronization from string dynamics | 4 pages, 4 figures | Phys.Rev.Lett. 88 (2002) 202501 | 10.1103/PhysRevLett.88.202501 | CERN-TH/2001-316 | hep-ph | null | The $\bar{\Omega}/\Omega$ ratio originating from string decays is predicted
to be larger than unity in proton proton interactions at SPS energies ($E_{\rm
lab}$=160 GeV). The anti-omega dominance increases with decreasing beam energy.
This surprising behavior is caused by the combinatorics of quark-antiquark
production in small and low-mass strings. Since this behavior is not found in a
statistical description of hadron production in proton proton collisions, it
may serve as a key observable to probe the hadronization mechanism in such
collisions.
| [
{
"created": "Thu, 15 Nov 2001 12:24:06 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Bleicher",
"M.",
""
],
[
"Liu",
"F. M.",
""
],
[
"Keränen",
"A.",
""
],
[
"Aichelin",
"J.",
""
],
[
"Bass",
"S. A.",
""
],
[
"Becattini",
"F.",
""
],
[
"Redlich",
"K.",
""
],
[
"Werner",
"K.",
... | The $\bar{\Omega}/\Omega$ ratio originating from string decays is predicted to be larger than unity in proton proton interactions at SPS energies ($E_{\rm lab}$=160 GeV). The anti-omega dominance increases with decreasing beam energy. This surprising behavior is caused by the combinatorics of quark-antiquark production in small and low-mass strings. Since this behavior is not found in a statistical description of hadron production in proton proton collisions, it may serve as a key observable to probe the hadronization mechanism in such collisions. |
1606.02558 | Jonathan Davis | Jonathan H. Davis | Projections for measuring the size of the solar core with
neutrino-electron scattering | 5 pages, 2 figures. Matches version accepted to PRL. Improved 2D
analysis and results discussion | Phys. Rev. Lett. 117, 211101 (2016) | 10.1103/PhysRevLett.117.211101 | KCL-PH-TH/2016-36 | hep-ph astro-ph.SR hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We quantify the amount of data needed in order to measure the size and
position of the $^8$B neutrino production region within the solar core, for
experiments looking at elastic scattering between electrons and solar
neutrinos. The directions of the electrons immediately after scattering are
strongly correlated with the incident directions of the neutrinos, however this
is degraded significantly by the subsequent scattering of these electrons in
the detector medium. We generate distributions of such electrons for different
neutrino production profiles, and use a maximum likelihood analysis to make
projections for future experimental sensitivity. We find that with
approximately 20 years worth of data the Super Kamiokande experiment could
constrain the central radius of the shell in which $^8$B neutrinos are produced
to be less than 0.22 of the total solar radius at 95% confidence.
| [
{
"created": "Wed, 8 Jun 2016 14:00:40 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Jun 2016 15:43:54 GMT",
"version": "v2"
},
{
"created": "Mon, 31 Oct 2016 08:34:10 GMT",
"version": "v3"
}
] | 2016-11-16 | [
[
"Davis",
"Jonathan H.",
""
]
] | We quantify the amount of data needed in order to measure the size and position of the $^8$B neutrino production region within the solar core, for experiments looking at elastic scattering between electrons and solar neutrinos. The directions of the electrons immediately after scattering are strongly correlated with the incident directions of the neutrinos, however this is degraded significantly by the subsequent scattering of these electrons in the detector medium. We generate distributions of such electrons for different neutrino production profiles, and use a maximum likelihood analysis to make projections for future experimental sensitivity. We find that with approximately 20 years worth of data the Super Kamiokande experiment could constrain the central radius of the shell in which $^8$B neutrinos are produced to be less than 0.22 of the total solar radius at 95% confidence. |
hep-ph/9909418 | Stefano Moretti | A. Dedes (RAL) and S. Moretti (RAL and Uppsala University) | Effects of CP-violating phases on Higgs boson production at hadron
colliders in the Minimal Supersymmetric Standard Model | 31 pages, latex (uses axodraw.sty), 14 figures - typos corrected in
Tab. I, eqs. (A.6) and (A.15): version to appear in Nucl. Phys. B | Nucl.Phys. B576 (2000) 29-55 | 10.1016/S0550-3213(00)00144-9 | RAL-TR-1999-042, TSL/ISV-99-0218 | hep-ph | null | If the soft Supersymmetry (SUSY) breaking masses and couplings are complex,
then the associated CP-violating phases can in principle modify the known
phenomenological pattern of the Minimal Supersymmetric Standard Model (MSSM).
We investigate here their effects on Higgs boson production in the gluon-gluon
fusion mode at the Tevatron and the Large Hadron Collider (LHC), by taking into
account all experimental bounds available at present. The by far most stringent
ones are those derived from the measurements of the Electric Dipole Moments
(EDMs) of fermions. However, it has recently been suggested that, over a
sizable portion of the MSSM parameter space, cancellations among the SUSY
contributions to the EDMs can take place, so that the CP-violating phases can
evade those limits. We find a strong dependence of the production rates of any
neutral Higgs state upon the complex masses and couplings over such parts of
the MSSM parameter space. We show these effects relatively to the ordinary MSSM
rates as well as illustrate them at absolute cross section level at both
colliders
| [
{
"created": "Fri, 17 Sep 1999 13:02:14 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Mar 2000 16:47:54 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Dedes",
"A.",
"",
"RAL"
],
[
"Moretti",
"S.",
"",
"RAL and Uppsala University"
]
] | If the soft Supersymmetry (SUSY) breaking masses and couplings are complex, then the associated CP-violating phases can in principle modify the known phenomenological pattern of the Minimal Supersymmetric Standard Model (MSSM). We investigate here their effects on Higgs boson production in the gluon-gluon fusion mode at the Tevatron and the Large Hadron Collider (LHC), by taking into account all experimental bounds available at present. The by far most stringent ones are those derived from the measurements of the Electric Dipole Moments (EDMs) of fermions. However, it has recently been suggested that, over a sizable portion of the MSSM parameter space, cancellations among the SUSY contributions to the EDMs can take place, so that the CP-violating phases can evade those limits. We find a strong dependence of the production rates of any neutral Higgs state upon the complex masses and couplings over such parts of the MSSM parameter space. We show these effects relatively to the ordinary MSSM rates as well as illustrate them at absolute cross section level at both colliders |
1008.3785 | Majid Hashemi | Majid Hashemi | Possibility of observing MSSM charged Higgs in association with a W
boson at LHC | 20 pages, 19 figures | Phys.Rev.D83:055004,2011 | 10.1103/PhysRevD.83.055004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Possibility of observing associated production of charged Higgs and W boson
in the framework of MSSM at LHC is studied. Both leptonic and hadronic decays
of W boson are studied while the charged Higgs boson is considered to decay to
a $\tau$ lepton and a neutrino. Therefore two search categories are defined
based on the leptonic and hadronic final states, i.e. $\ell \tau+E^{miss}_{T}$
and $jj \tau+E^{miss}_{T}$ where $\ell=e$ or $\mu$ and $j$ is a light jet from
$W$ decay. The discovery chance of the two categories is evaluated at an
integrated luminosity of 300 \invfb at LHC. It is shown that both leptonic and
hadronic final states have the chance of discovery at high \tanb. Finally
$5\sigma$ and $3\sigma$ contours are provided for both search categories.
| [
{
"created": "Mon, 23 Aug 2010 09:59:08 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Aug 2010 05:30:17 GMT",
"version": "v2"
},
{
"created": "Tue, 11 Jan 2011 13:11:35 GMT",
"version": "v3"
}
] | 2011-03-21 | [
[
"Hashemi",
"Majid",
""
]
] | Possibility of observing associated production of charged Higgs and W boson in the framework of MSSM at LHC is studied. Both leptonic and hadronic decays of W boson are studied while the charged Higgs boson is considered to decay to a $\tau$ lepton and a neutrino. Therefore two search categories are defined based on the leptonic and hadronic final states, i.e. $\ell \tau+E^{miss}_{T}$ and $jj \tau+E^{miss}_{T}$ where $\ell=e$ or $\mu$ and $j$ is a light jet from $W$ decay. The discovery chance of the two categories is evaluated at an integrated luminosity of 300 \invfb at LHC. It is shown that both leptonic and hadronic final states have the chance of discovery at high \tanb. Finally $5\sigma$ and $3\sigma$ contours are provided for both search categories. |
1501.03151 | Dietrich Bodeker | D. Bodeker and M. Sangel | Order g^2 susceptibilities in the symmetric phase of the Standard Model | 18 pages, 2 figures | null | 10.1088/1475-7516/2015/04/040 | BI-TP 2014/25 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Susceptibilities of conserved charges such as baryon minus lepton number
enter baryogenesis computations, since they provide the relationship between
conserved charges and chemical potentials. Their next-to-leading order
corrections are of order g, where g is a generic Standard Model coupling. They
are due to soft Higgs boson exchange, and have been calculated recently,
together with some order g^2 corrections. Here we compute the complete g^2
contributions. Close to the electroweak crossover the soft Higgs contribution
is of order g^2, and is determined by the non-perturbative physics at the
magnetic screening scale.
| [
{
"created": "Tue, 13 Jan 2015 21:00:01 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Bodeker",
"D.",
""
],
[
"Sangel",
"M.",
""
]
] | Susceptibilities of conserved charges such as baryon minus lepton number enter baryogenesis computations, since they provide the relationship between conserved charges and chemical potentials. Their next-to-leading order corrections are of order g, where g is a generic Standard Model coupling. They are due to soft Higgs boson exchange, and have been calculated recently, together with some order g^2 corrections. Here we compute the complete g^2 contributions. Close to the electroweak crossover the soft Higgs contribution is of order g^2, and is determined by the non-perturbative physics at the magnetic screening scale. |
1504.04604 | Yu-Feng Zhou | Hong-Bo Jin, Yue-Liang Wu, Yu-Feng Zhou | Upper limits on DM annihilation cross sections from the first AMS-02
antiproton data | 15 pages, 6 figures. More discussions on DM contributions added, to
appear in PRD. arXiv admin note: text overlap with arXiv:1410.0171 | Phys. Rev. D 92, 055027 (2015) | 10.1103/PhysRevD.92.055027 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The first measurement on the antiproton to proton ratio made by the AMS-02
collaboration agrees with the expection from conventional cosmic-ray
secondaries in the kinetic energy range $\sim 10-100$ GeV, which can be turned
into stringent upper limits on the dark matter (DM) annihilation cross sections
above $\sim 300$ GeV. Using the GALPROP code, we derive the upper limits in
various propagation models and DM profiles. We show that in the "conventional"
propagation model, for the $q\bar q$, $b\bar b$, and $WW$ final states, the
constraints can be more stringent than that derived from the recent Ferm-LAT
gamma-ray data on the dwarf spheroidal satellite galaxies. Making use of the
typical minimal, median and maximal models obtained from a previous global fit,
we show that the variation of the upper limits is around a factor of five. The
possibility of DM contribution to the high energy $\bar p/p$ data is discussed.
| [
{
"created": "Fri, 17 Apr 2015 18:59:15 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Apr 2015 15:57:16 GMT",
"version": "v2"
},
{
"created": "Thu, 27 Aug 2015 12:29:17 GMT",
"version": "v3"
}
] | 2015-09-30 | [
[
"Jin",
"Hong-Bo",
""
],
[
"Wu",
"Yue-Liang",
""
],
[
"Zhou",
"Yu-Feng",
""
]
] | The first measurement on the antiproton to proton ratio made by the AMS-02 collaboration agrees with the expection from conventional cosmic-ray secondaries in the kinetic energy range $\sim 10-100$ GeV, which can be turned into stringent upper limits on the dark matter (DM) annihilation cross sections above $\sim 300$ GeV. Using the GALPROP code, we derive the upper limits in various propagation models and DM profiles. We show that in the "conventional" propagation model, for the $q\bar q$, $b\bar b$, and $WW$ final states, the constraints can be more stringent than that derived from the recent Ferm-LAT gamma-ray data on the dwarf spheroidal satellite galaxies. Making use of the typical minimal, median and maximal models obtained from a previous global fit, we show that the variation of the upper limits is around a factor of five. The possibility of DM contribution to the high energy $\bar p/p$ data is discussed. |
2102.13175 | Ulugbek Yakhshiev | Ulugbek Yakhshiev | Test of the nonrelativistic $c\bar{c}$ potential | 5 pages | null | 10.1007/s40042-021-00234-8 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | We analyze the charmonium states by testing a phenomenological
nonrelativistic potential and propose a new set of parameters. This new set of
parameters are fixed using only the lowest lying S-wave states of charmonia
where the spin-orbit and tensor interactions will not contribute. After fitting
the parameters we analyze the whole fine structure of charmonium states taking
into account the spin-orbit and tensor interactions too. Calculations showed
that the nonrelativistic potential model with the phenomenologically defined
parameters is indeed well approximation for describing the charmonium states.
| [
{
"created": "Thu, 25 Feb 2021 21:05:11 GMT",
"version": "v1"
}
] | 2021-07-14 | [
[
"Yakhshiev",
"Ulugbek",
""
]
] | We analyze the charmonium states by testing a phenomenological nonrelativistic potential and propose a new set of parameters. This new set of parameters are fixed using only the lowest lying S-wave states of charmonia where the spin-orbit and tensor interactions will not contribute. After fitting the parameters we analyze the whole fine structure of charmonium states taking into account the spin-orbit and tensor interactions too. Calculations showed that the nonrelativistic potential model with the phenomenologically defined parameters is indeed well approximation for describing the charmonium states. |
1710.02463 | Nelia Mann | Ziyi Hu, Brian Maddock, Nelia Mann | A Second Look at String-Inspired Models for Proton-Proton Scattering via
Pomeron Exchange | 16 pages, 7 figures, 2 tables | null | 10.1007/JHEP08(2018)093 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We re-examine a string dual model for elastic proton-proton scattering via
Pomeron exchange. We argue that the method of "Reggeizing" a propagator to take
into account an entire trajectory of exchanged particles can be generalized, in
particular by modifying the value of the mass-shell parameter in the model. We
then fit the generalized model to scattering data at large s and small t. The
fitting results are inconclusive, but suggest that a better fit might be
obtained by allowing the mass-shell to vary. The model fits the data equally
well (roughly) for a wide range of values of the mass-shell parameter, but the
other fitting parameters (the slope and intercept of the Regge trajectory, and
the coupling constant and dipole mass from the proton-proton-glueball coupling)
are then inconsistent with what we expect. On the other hand, using the
traditional method of Reggeization generates a weaker fit, but the other
parameters obtain more physically reasonable values. In analyzing the fitting
results, we also found that our model is more consistent with the sqrt(s) =
1800 GeV coming from the E710 experiment than that coming from the CDF
experiment, and that our model has the greatest discrepancy with the data in
the range 0.5 GeV^2 < |t| < 0.6 GeV^2, suggesting that the transition from soft
Pomeron to hard Pomeron may occur closer to t = -0.5 GeV^2 rather than t = -0.6
GeV^2 as previously thought.
| [
{
"created": "Fri, 6 Oct 2017 15:51:30 GMT",
"version": "v1"
}
] | 2018-09-26 | [
[
"Hu",
"Ziyi",
""
],
[
"Maddock",
"Brian",
""
],
[
"Mann",
"Nelia",
""
]
] | We re-examine a string dual model for elastic proton-proton scattering via Pomeron exchange. We argue that the method of "Reggeizing" a propagator to take into account an entire trajectory of exchanged particles can be generalized, in particular by modifying the value of the mass-shell parameter in the model. We then fit the generalized model to scattering data at large s and small t. The fitting results are inconclusive, but suggest that a better fit might be obtained by allowing the mass-shell to vary. The model fits the data equally well (roughly) for a wide range of values of the mass-shell parameter, but the other fitting parameters (the slope and intercept of the Regge trajectory, and the coupling constant and dipole mass from the proton-proton-glueball coupling) are then inconsistent with what we expect. On the other hand, using the traditional method of Reggeization generates a weaker fit, but the other parameters obtain more physically reasonable values. In analyzing the fitting results, we also found that our model is more consistent with the sqrt(s) = 1800 GeV coming from the E710 experiment than that coming from the CDF experiment, and that our model has the greatest discrepancy with the data in the range 0.5 GeV^2 < |t| < 0.6 GeV^2, suggesting that the transition from soft Pomeron to hard Pomeron may occur closer to t = -0.5 GeV^2 rather than t = -0.6 GeV^2 as previously thought. |
2212.01794 | Michael Fucilla | Michael Fucilla | The Higgs impact factor at next-to-leading order | 6 pages, 2 Figures. Presented by Michael Fucilla at Diffraction and
Low-x 2022, Corigliano Calabro (Italy), September 24-30, 2022 | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute at next-to-leading order level the impact factor for the
production of a forward Higgs boson from a colliding proton. Combined with
other forward impact factors, it can be used to describe, at next-to-leading
logarithmic accuracy, processes in which two objects featuring large separation
in rapidity are detected at the Large Hadron Collider (LHC). As well, combined
with a proper definition of the \textit{unintegrated gluon distribution} (UGD),
it can be used to compute small-$x$ corrections to the forward Higgs
production.
| [
{
"created": "Sun, 4 Dec 2022 10:45:53 GMT",
"version": "v1"
}
] | 2022-12-06 | [
[
"Fucilla",
"Michael",
""
]
] | We compute at next-to-leading order level the impact factor for the production of a forward Higgs boson from a colliding proton. Combined with other forward impact factors, it can be used to describe, at next-to-leading logarithmic accuracy, processes in which two objects featuring large separation in rapidity are detected at the Large Hadron Collider (LHC). As well, combined with a proper definition of the \textit{unintegrated gluon distribution} (UGD), it can be used to compute small-$x$ corrections to the forward Higgs production. |
hep-ph/9605225 | null | Stefano Moretti (Cavendish Laboratory, Cambridge, UK) | The process $e^+e^-\to b\bar bW^+W^-$ at the Next Linear Collider in the
Minimal Supersymmetric Standard Model | 43 pages, latex, 20 PostScript figures included, complete file and
full resolution figures available at ftp://axpa.hep.phy.cam.ac.uk/moretti or
at http://www.hep.phy.cam.ac.uk/theory/papers/ | Z.Phys. C73 (1997) 653-668 | null | Cavendish-HEP-96/03, DFTT 19/96 | hep-ph | null | The complete matrix element for $e^+e^-\rightarrow b\bar b W^+W^-$ is
computed at tree-level within the Minimal Supersymmetric Standard Model. Rates
of interest to phenomenological analyses at the Next Linear Collider are given.
In particular, we study: - $t\bar t$ production and decay $t\bar t\ar
(bW^+)(\bar bW^-)$; - $ZH$ production followed by $Z\ar b\bar b$ and $H\ar
W^+W^-$; - $AH$ production followed by $A\ar b\bar b$ and $H\ar W^+W^-$; -
$hW^+W^-$ production followed by $h\ar b\bar b$. Top and Higgs finite width
effects are included, as well as all those of the irreducible backgrounds.
| [
{
"created": "Sun, 5 May 1996 16:38:38 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Moretti",
"Stefano",
"",
"Cavendish Laboratory, Cambridge, UK"
]
] | The complete matrix element for $e^+e^-\rightarrow b\bar b W^+W^-$ is computed at tree-level within the Minimal Supersymmetric Standard Model. Rates of interest to phenomenological analyses at the Next Linear Collider are given. In particular, we study: - $t\bar t$ production and decay $t\bar t\ar (bW^+)(\bar bW^-)$; - $ZH$ production followed by $Z\ar b\bar b$ and $H\ar W^+W^-$; - $AH$ production followed by $A\ar b\bar b$ and $H\ar W^+W^-$; - $hW^+W^-$ production followed by $h\ar b\bar b$. Top and Higgs finite width effects are included, as well as all those of the irreducible backgrounds. |
1610.00009 | Matthias Neubert | Martin Bauer (U. Heidelberg), Matthias Neubert (MITP and JGU Mainz,
Cornell U.) and Andrea Thamm (JGU Mainz) | Analyzing the CP Nature of a New Scalar Particle via S->Zh Decay | This letter is a significantly rewritten descendent of our previous
work arXiv:1607.01016, which was motivated by the 750 GeV diphoton resonance.
The current version contains relevant new material and is independent of the
existence of such a resonance (6 pages, 4 figures; accepted for publication
in Phys. Rev. Lett.) | Phys. Rev. Lett. 117, 181801 (2016) | 10.1103/PhysRevLett.117.181801 | MITP/16-105 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scalar particles $S$ which are singlets under the Standard Model gauge group
are generic features of many models of fundamental physics, in particular as
possible mediators to a hidden sector. We show that the decay $S\to Zh$
provides a powerful probe of the CP nature of the scalar, because it is allowed
only if $S$ has CP-odd interactions. We perform a model-independent analysis of
this decay using an effective Lagrangian and compute the relevant Wilson
coefficients arising from integrating out heavy fermions to one-loop order.
| [
{
"created": "Fri, 30 Sep 2016 20:00:02 GMT",
"version": "v1"
}
] | 2016-11-02 | [
[
"Bauer",
"Martin",
"",
"U. Heidelberg"
],
[
"Neubert",
"Matthias",
"",
"MITP and JGU Mainz,\n Cornell U."
],
[
"Thamm",
"Andrea",
"",
"JGU Mainz"
]
] | Scalar particles $S$ which are singlets under the Standard Model gauge group are generic features of many models of fundamental physics, in particular as possible mediators to a hidden sector. We show that the decay $S\to Zh$ provides a powerful probe of the CP nature of the scalar, because it is allowed only if $S$ has CP-odd interactions. We perform a model-independent analysis of this decay using an effective Lagrangian and compute the relevant Wilson coefficients arising from integrating out heavy fermions to one-loop order. |
2005.03016 | Rhorry Gauld | R. Gauld, A. Gehrmann-De Ridder, E. W. N. Glover, A. Huss, I. Majer | Predictions for $\mathrm{Z}$-boson production in association with a
$\mathrm{b}$-jet at $\mathcal{O}(\alpha_s^3)$ | 7 pages including references, 3 figures. v2 matches PRL version | null | 10.1103/PhysRevLett.125.222002 | NIKHEF 2020-012, ZU-TH 12/20, IPPP/20/13, CERN-TH-2020-071 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Precise predictions are provided for the production of a $\mathrm{Z}$-boson
and a $\mathrm{b}$-jet in hadron-hadron collisions within the framework of
perturbative QCD, at $\mathcal{O}(\alpha_s^3)$. To obtain these predictions we
perform the first calculation of a hadronic scattering process involving the
direct production of a flavoured-jet at next-to-next-to-leading order accuracy
in massless QCD, and extend techniques to also account for the impact of finite
heavy-quark mass effects. The predictions are compared to CMS data obtained in
$\mathrm{pp}$ collisions at a centre-of-mass energy of $8~\mathrm{TeV}$, which
are the most precise data from Run I of the LHC for this process, where a good
description of the data is achieved. To allow this comparison we have performed
an unfolding of the data, which overcomes the long-standing issue that the
experimental and theoretical definitions of jet flavour are incompatible.
| [
{
"created": "Wed, 6 May 2020 18:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jan 2021 11:51:45 GMT",
"version": "v2"
}
] | 2021-01-12 | [
[
"Gauld",
"R.",
""
],
[
"Ridder",
"A. Gehrmann-De",
""
],
[
"Glover",
"E. W. N.",
""
],
[
"Huss",
"A.",
""
],
[
"Majer",
"I.",
""
]
] | Precise predictions are provided for the production of a $\mathrm{Z}$-boson and a $\mathrm{b}$-jet in hadron-hadron collisions within the framework of perturbative QCD, at $\mathcal{O}(\alpha_s^3)$. To obtain these predictions we perform the first calculation of a hadronic scattering process involving the direct production of a flavoured-jet at next-to-next-to-leading order accuracy in massless QCD, and extend techniques to also account for the impact of finite heavy-quark mass effects. The predictions are compared to CMS data obtained in $\mathrm{pp}$ collisions at a centre-of-mass energy of $8~\mathrm{TeV}$, which are the most precise data from Run I of the LHC for this process, where a good description of the data is achieved. To allow this comparison we have performed an unfolding of the data, which overcomes the long-standing issue that the experimental and theoretical definitions of jet flavour are incompatible. |
1512.00913 | Teruyuki Kitabayashi | Teruyuki Kitabayashi and Masaki Yasu\`e | Formulae for flavour neutrino masses and its application to texture two
zeros | 8 pages, 2 figures, version accepted for publication in Physical
Review D | Phys. Rev. D 93, 053012 (2016) | 10.1103/PhysRevD.93.053012 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate the usefulness of flavour neutrino masses expressed in terms
of $M_{ee},M_{e\mu}$ and $M_{e\tau}$. The analytical expressions for the
flavour neutrino masses, mass eigenstates and physical CP-violating Majorana
phases for texture two zeros are obtained exactly.
| [
{
"created": "Thu, 3 Dec 2015 00:41:06 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Feb 2016 02:11:13 GMT",
"version": "v2"
}
] | 2016-03-30 | [
[
"Kitabayashi",
"Teruyuki",
""
],
[
"Yasuè",
"Masaki",
""
]
] | We demonstrate the usefulness of flavour neutrino masses expressed in terms of $M_{ee},M_{e\mu}$ and $M_{e\tau}$. The analytical expressions for the flavour neutrino masses, mass eigenstates and physical CP-violating Majorana phases for texture two zeros are obtained exactly. |
hep-ph/0311307 | Ilya Lvovich Shapiro | Ilya L. Shapiro | An Overview of the Anomaly-Induced Inflation | Talk presented at IRGA2003 (Renormalization Group and Anomalies in
Gravitation and Cosmology, Ouro Preto, Brazil, 16-23 March, 2003) | null | 10.1016/S0920-5632(03)02431-9 | null | hep-ph | null | The anomaly-induced inflation (modified Starobinsky model) is based on the
application of the effective quantum field theory approach to the Early
Universe. We present a brief general review of this model with a special
attention to the existing difficulties and unsolved problems.
| [
{
"created": "Mon, 24 Nov 2003 17:50:39 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Shapiro",
"Ilya L.",
""
]
] | The anomaly-induced inflation (modified Starobinsky model) is based on the application of the effective quantum field theory approach to the Early Universe. We present a brief general review of this model with a special attention to the existing difficulties and unsolved problems. |
hep-ph/9902377 | A. N. Mitra | A.N.Mitra | Soft-QCD Effects In B to gamma gamma Decay: Quark Level Form Factors | 11 pages, 1 figure, LaTex | null | 10.1016/S0370-2693(99)01504-X | null | hep-ph | null | Soft-QCD effects of quark-level form factors in $\gamma\gamma$ decay of
$B_s$-mesons via $D{\bar D}$ intermediate states, suggested by Ellis et al, are
examined in the "Salpeter" model [reinterpreted in terms of the Markov-Yukawa
Transversality Principle (MYTP)] when formulated on a covariant light front
(null-plane). The gluonic kernel in the infrared regime which generates the
constituent mass via standard $DB{\chi}S$, is calibrated to both $q{\bar q}$
and qqq spectra, meson mass splittings, pion form factor,and other parameters.
With this check, an exact evaluation of the $D{\bar D}\gamma$ vertex form
factor $F(\alpha)$ (normalized to F(0)=1), gives a multiplicative effect of
$F^2(\alpha)$ on the $B_s \Rightarrow \gamma\gamma$ amplitude via D-meson
triangle loop, where $\alpha$ = $(p^2+M^2)/M^2$ is the off-shellness parameter
of the exchanged D-meson of mass M and 4-momentum $p_\mu$, and is a variables
of the (internal)loop integration. Unfortunately, the $F^2(\alpha)$ effect
decreases the loop amplitude by a factor of 30 w.r.t. the point hadron value,
resulting in a reduction of 3 orders of magnitude in long distance (hadronic)
contributions to the $B_s \Rightarrow \gamma\gamma$ decay rate, thus greatly
impairing the visibility of such modes. PACS: 11.10.St ; 12.38.Lg ; 13.20.Gd ;
13.40.Hq Keywords: $B_s$ radiative decay; Soft-QCD; Vertex-Fn; Form-factor;
Markov-Yukawa-Transversality Principle; Salpeter eq; Cov. light front
| [
{
"created": "Wed, 17 Feb 1999 16:49:13 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jun 1999 12:53:04 GMT",
"version": "v2"
},
{
"created": "Sun, 17 Oct 1999 15:17:28 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Mitra",
"A. N.",
""
]
] | Soft-QCD effects of quark-level form factors in $\gamma\gamma$ decay of $B_s$-mesons via $D{\bar D}$ intermediate states, suggested by Ellis et al, are examined in the "Salpeter" model [reinterpreted in terms of the Markov-Yukawa Transversality Principle (MYTP)] when formulated on a covariant light front (null-plane). The gluonic kernel in the infrared regime which generates the constituent mass via standard $DB{\chi}S$, is calibrated to both $q{\bar q}$ and qqq spectra, meson mass splittings, pion form factor,and other parameters. With this check, an exact evaluation of the $D{\bar D}\gamma$ vertex form factor $F(\alpha)$ (normalized to F(0)=1), gives a multiplicative effect of $F^2(\alpha)$ on the $B_s \Rightarrow \gamma\gamma$ amplitude via D-meson triangle loop, where $\alpha$ = $(p^2+M^2)/M^2$ is the off-shellness parameter of the exchanged D-meson of mass M and 4-momentum $p_\mu$, and is a variables of the (internal)loop integration. Unfortunately, the $F^2(\alpha)$ effect decreases the loop amplitude by a factor of 30 w.r.t. the point hadron value, resulting in a reduction of 3 orders of magnitude in long distance (hadronic) contributions to the $B_s \Rightarrow \gamma\gamma$ decay rate, thus greatly impairing the visibility of such modes. PACS: 11.10.St ; 12.38.Lg ; 13.20.Gd ; 13.40.Hq Keywords: $B_s$ radiative decay; Soft-QCD; Vertex-Fn; Form-factor; Markov-Yukawa-Transversality Principle; Salpeter eq; Cov. light front |
hep-ph/9703435 | David Bowser-Chao | David Bowser-Chao, Darwin Chang, Wai-Yee Keung | Electron Electric Dipole Moment from CP Violation in the Charged Higgs
Sector | resubmission now matches published version in PRL, plus adds
reference to AGS proposal to measure the muon edm to 10^-24 e-cm; complete
uncompressed postscript at
http://hepster.phy.uic.edu/~davechao/work/default.html | Phys.Rev.Lett.79:1988-1991,1997 | 10.1103/PhysRevLett.79.1988 | NHCU-HEP-97-5, UICHEP-TH/97-3 | hep-ph | null | The leading contributions to the electron (or muon) electric dipole moment
due to CP violation in the charged Higgs sector are at the two-loop level. A
careful analysis of the model-independent contribution is provided. We also
consider specific scenarios to demonstrate how charged Higgs sector CP
violation can naturally give rise to large electric dipole moments. Numerical
results show that the electron electric dipole moment in such models can lie at
the experimentally accessible level.
| [
{
"created": "Wed, 26 Mar 1997 22:34:12 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Dec 1997 23:15:08 GMT",
"version": "v2"
}
] | 2009-09-01 | [
[
"Bowser-Chao",
"David",
""
],
[
"Chang",
"Darwin",
""
],
[
"Keung",
"Wai-Yee",
""
]
] | The leading contributions to the electron (or muon) electric dipole moment due to CP violation in the charged Higgs sector are at the two-loop level. A careful analysis of the model-independent contribution is provided. We also consider specific scenarios to demonstrate how charged Higgs sector CP violation can naturally give rise to large electric dipole moments. Numerical results show that the electron electric dipole moment in such models can lie at the experimentally accessible level. |
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