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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1906.11098 | R. Sekhar Chivukula | R. Sekhar Chivukula, Dennis Foren, Kirtimaan A Mohan, Dipan Sengupta,
and Elizabeth Simmons | Scattering Amplitudes of Massive Spin-2 Kaluza-Klein States Grow Only as
${\cal O}(s)$ | 10 pages, one included tikz figure. References added. Modified per
referee comments, and shortened | Phys. Rev. D 101, 055013 (2020) | 10.1103/PhysRevD.101.055013 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the results of the first complete calculation of the tree-level
$2\to 2$ high-energy scattering amplitudes of the longitudinal modes of massive
spin-2 Kaluza-Klein states, both in the case where the internal space is a
torus and in the Randall-Sundrum model where the internal space has constant
negative curvature. While individual contributions to this amplitude grow as
${\cal O}(s^5$), we demonstrate explicitly that intricate cancellations occur
between different contributions, reducing the growth to ${\cal O}(s)$, a slower
rate of growth than previously argued in the literature. These cancellations
require subtle relationships between the masses of the Kaluza-Klein states and
their interactions, and reflect the underlying higher-dimensional
diffeomorphism invariance. Our results provide fresh perspective on the range
of validity of (effective) field theories involving massive spin-2 KK
particles, with significant implications for the theory and phenomenology of
these states.
| [
{
"created": "Wed, 26 Jun 2019 13:46:00 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Jul 2019 18:20:57 GMT",
"version": "v2"
},
{
"created": "Thu, 17 Oct 2019 02:59:35 GMT",
"version": "v3"
}
] | 2020-03-11 | [
[
"Chivukula",
"R. Sekhar",
""
],
[
"Foren",
"Dennis",
""
],
[
"Mohan",
"Kirtimaan A",
""
],
[
"Sengupta",
"Dipan",
""
],
[
"Simmons",
"Elizabeth",
""
]
] | We present the results of the first complete calculation of the tree-level $2\to 2$ high-energy scattering amplitudes of the longitudinal modes of massive spin-2 Kaluza-Klein states, both in the case where the internal space is a torus and in the Randall-Sundrum model where the internal space has constant negative curvature. While individual contributions to this amplitude grow as ${\cal O}(s^5$), we demonstrate explicitly that intricate cancellations occur between different contributions, reducing the growth to ${\cal O}(s)$, a slower rate of growth than previously argued in the literature. These cancellations require subtle relationships between the masses of the Kaluza-Klein states and their interactions, and reflect the underlying higher-dimensional diffeomorphism invariance. Our results provide fresh perspective on the range of validity of (effective) field theories involving massive spin-2 KK particles, with significant implications for the theory and phenomenology of these states. |
1310.2005 | Bo-Qiang Ma | Yujie Chi, Bo-Qiang Ma | Quark to $\Lambda$-hyperon spin transfers in the current-fragmentation
region | 14 latex pages, 8 figures. Final version for publication in PLB | null | 10.1016/j.physletb.2013.09.044 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a study on the struck quark to the $\Lambda$-hyperon fragmentation
processes by taking into account the anti-quark fragmentations and intermediate
decays from other hyperons. We concentrate on how the longitudinally polarized
quark fragments to the longitudinally polarized $\Lambda$, how unpolarized
quark and anti-quark fragment to the unpolarized $\Lambda$, and how quark and
anti-quark fragment to the $\Lambda$ through the intermediate decay processes.
We calculate the effective fragmentation functions in the light-cone SU(6)
quark-spectator-diquark model via the Gribov-Lipatov relation, with the
Melosh-Wigner rotation effect also included. The calculated results are in
reasonable agreement with the HERMES semi-inclusive $ep$ experimental data and
the OPAL and ALEPH $e^{+}e^{-}$ annihilation experimental data.
| [
{
"created": "Tue, 8 Oct 2013 05:12:43 GMT",
"version": "v1"
}
] | 2013-10-09 | [
[
"Chi",
"Yujie",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] | We perform a study on the struck quark to the $\Lambda$-hyperon fragmentation processes by taking into account the anti-quark fragmentations and intermediate decays from other hyperons. We concentrate on how the longitudinally polarized quark fragments to the longitudinally polarized $\Lambda$, how unpolarized quark and anti-quark fragment to the unpolarized $\Lambda$, and how quark and anti-quark fragment to the $\Lambda$ through the intermediate decay processes. We calculate the effective fragmentation functions in the light-cone SU(6) quark-spectator-diquark model via the Gribov-Lipatov relation, with the Melosh-Wigner rotation effect also included. The calculated results are in reasonable agreement with the HERMES semi-inclusive $ep$ experimental data and the OPAL and ALEPH $e^{+}e^{-}$ annihilation experimental data. |
2012.07867 | Damiano Francesco Giuseppe Fiorillo | Damiano F. G. Fiorillo, Gianpiero Mangano, Stefano Morisi and Ofelia
Pisanti | IceCube constraints on Violation of Equivalence Principle | 9 pages, 3 figures | JCAP 04 (2021) 079 | 10.1088/1475-7516/2021/04/079 | null | hep-ph astro-ph.HE gr-qc hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Among the information provided by high energy neutrinos, a promising
possibility is to analyze the effects of a Violation of Equivalence Principle
(VEP) on neutrino oscillations. We analyze the recently released IceCube data
on atmospheric neutrino fluxes under the assumption of a VEP and obtain updated
constraints on the parameter space with the benchmark choice that neutrinos
with different masses couple with different strengths to the gravitational
field. In this case we find that the VEP parameters times the local
gravitational potential at Earth can be constrained at the level of $10^{-27}$.
We show that the constraints from atmospheric neutrinos strongly depend on the
assumption that the neutrino eigenstates interacting diagonally with the
gravitational field coincide with the mass eigenstates, which is not \textit{a
priori} justified: this is particularly clear in the case that the basis of
diagonal gravitational interaction coincide with the flavor basis, which cannot
be constrained by the observation of atmospheric neutrinos. Finally, we
quantitatively study the effect of a VEP on the flavor composition of the
astrophysical neutrinos, stressing again the interplay with the basis in which
the VEP is diagonal: we find that for some choices of such basis the flavor
ratio measured by IceCube can significantly change.
| [
{
"created": "Mon, 14 Dec 2020 19:00:05 GMT",
"version": "v1"
},
{
"created": "Wed, 19 May 2021 13:15:30 GMT",
"version": "v2"
}
] | 2021-05-20 | [
[
"Fiorillo",
"Damiano F. G.",
""
],
[
"Mangano",
"Gianpiero",
""
],
[
"Morisi",
"Stefano",
""
],
[
"Pisanti",
"Ofelia",
""
]
] | Among the information provided by high energy neutrinos, a promising possibility is to analyze the effects of a Violation of Equivalence Principle (VEP) on neutrino oscillations. We analyze the recently released IceCube data on atmospheric neutrino fluxes under the assumption of a VEP and obtain updated constraints on the parameter space with the benchmark choice that neutrinos with different masses couple with different strengths to the gravitational field. In this case we find that the VEP parameters times the local gravitational potential at Earth can be constrained at the level of $10^{-27}$. We show that the constraints from atmospheric neutrinos strongly depend on the assumption that the neutrino eigenstates interacting diagonally with the gravitational field coincide with the mass eigenstates, which is not \textit{a priori} justified: this is particularly clear in the case that the basis of diagonal gravitational interaction coincide with the flavor basis, which cannot be constrained by the observation of atmospheric neutrinos. Finally, we quantitatively study the effect of a VEP on the flavor composition of the astrophysical neutrinos, stressing again the interplay with the basis in which the VEP is diagonal: we find that for some choices of such basis the flavor ratio measured by IceCube can significantly change. |
hep-ph/0006150 | Ulrich Heinz | Ulrich Heinz, Pierre Scotto, and Qing-Hui Zhang | Multi-boson effects in Bose-Einstein interferometry and the multiplicity
distribution | 22 pages ReVTex, including 8 postscript figures. Submitted to Annals
of Physics (N.Y.) | Annals Phys.288:325-360,2001 | 10.1006/aphy.2000.6103 | CERN-TH/2000-123 | hep-ph | null | Multi-boson symmetrization effects on two-particle Bose-Einstein
interferometry are studied for ensembles with arbitrary multiplicity
distributions. This generalizes the previously studied case of a Poissonian
input multiplicity distribution. In the general case we find interesting
residual correlations which require a modified framework for extracting
information on the source geometry from two-particle correlation measurements.
In sources with high phase-space densities, multi-boson effects modify the
Hanbury Brown-Twiss (HBT) radius parameters and simultaneously generate strong
residual correlations. We clarify their effect on the correlation strength
(intercept parameter) and thus explain a variety of previously reported
puzzling multi-boson symmetrization phenomena. Using a class of analytically
solvable Gaussian source models, with and without space-momentum correlations,
we present a comprehensive overview of multi-boson symmetrization effects on
particle interferometry. For event ensembles of (approximately) fixed
multiplicity, the residual correlations lead to a minimum in the correlation
function at non-zero relative momentum, which can be practically exploited to
search, in a model-independent way, for multi-boson symmetrization effects in
high-energy heavy-ion experiments.
| [
{
"created": "Wed, 14 Jun 2000 08:33:33 GMT",
"version": "v1"
}
] | 2009-10-09 | [
[
"Heinz",
"Ulrich",
""
],
[
"Scotto",
"Pierre",
""
],
[
"Zhang",
"Qing-Hui",
""
]
] | Multi-boson symmetrization effects on two-particle Bose-Einstein interferometry are studied for ensembles with arbitrary multiplicity distributions. This generalizes the previously studied case of a Poissonian input multiplicity distribution. In the general case we find interesting residual correlations which require a modified framework for extracting information on the source geometry from two-particle correlation measurements. In sources with high phase-space densities, multi-boson effects modify the Hanbury Brown-Twiss (HBT) radius parameters and simultaneously generate strong residual correlations. We clarify their effect on the correlation strength (intercept parameter) and thus explain a variety of previously reported puzzling multi-boson symmetrization phenomena. Using a class of analytically solvable Gaussian source models, with and without space-momentum correlations, we present a comprehensive overview of multi-boson symmetrization effects on particle interferometry. For event ensembles of (approximately) fixed multiplicity, the residual correlations lead to a minimum in the correlation function at non-zero relative momentum, which can be practically exploited to search, in a model-independent way, for multi-boson symmetrization effects in high-energy heavy-ion experiments. |
1712.07957 | Feng-Kun Guo | Meng-Lin Du, Miguel Albaladejo, Pedro Fernandez-Soler, Feng-Kun Guo,
Christoph Hanhart, Ulf-G. Mei{\ss}ner, Juan Nieves, De-Liang Yao | Towards a new paradigm for heavy-light meson spectroscopy | 8 pages, 5 figures. Discussion significantly extended, suggestion for
lattice and more comparison with LHCb data added; version accepted for
publication in PRD | Phys. Rev. D 98, 094018 (2018) | 10.1103/PhysRevD.98.094018 | null | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Since 2003 many new hadrons, including the lowest-lying positive-parity
charm-strange mesons ${D_{s0}^*(2317)}$ and ${D_{s1}(2460)}$, were observed
that do not conform with quark model expectations. It was recently demonstrated
that various puzzles in the charm meson spectrum find a natural resolution, if
the SU(3) multiplets for the lightest scalar and axial-vector states, amongst
them the ${D_{s0}^*(2317)}$ and the ${D_{s1}(2460)}$, owe their existence to
the nonperturbative dynamics of Goldstone-Boson scattering off $D_{(s)}$ and
$D^*_{(s)}$ mesons. Most importantly the ordering of the lightest strange and
nonstrange scalars becomes natural. In this work we demonstrate for the first
time that this mechanism is strongly supported by the recent high quality data
on the ${B^-\to D^+\pi^-\pi^- }$ provided by the LHCb experiment. This implies
that the lowest quark-model positive-parity charm mesons, together with their
bottom counterparts, if realized in nature, do not form the ground-state
multiplet. This is similar to the pattern that has been established for the
scalar mesons made from light up, down and strange quarks, where the lowest
multiplet is considered to be made of states not described by the quark model.
In a broader view, the hadron spectrum must be viewed as more than a collection
of quark model states.
| [
{
"created": "Thu, 21 Dec 2017 14:20:51 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Nov 2018 14:37:22 GMT",
"version": "v2"
}
] | 2018-11-28 | [
[
"Du",
"Meng-Lin",
""
],
[
"Albaladejo",
"Miguel",
""
],
[
"Fernandez-Soler",
"Pedro",
""
],
[
"Guo",
"Feng-Kun",
""
],
[
"Hanhart",
"Christoph",
""
],
[
"Meißner",
"Ulf-G.",
""
],
[
"Nieves",
"Juan",
""
],
[
"Yao",
"De-Liang",
""
]
] | Since 2003 many new hadrons, including the lowest-lying positive-parity charm-strange mesons ${D_{s0}^*(2317)}$ and ${D_{s1}(2460)}$, were observed that do not conform with quark model expectations. It was recently demonstrated that various puzzles in the charm meson spectrum find a natural resolution, if the SU(3) multiplets for the lightest scalar and axial-vector states, amongst them the ${D_{s0}^*(2317)}$ and the ${D_{s1}(2460)}$, owe their existence to the nonperturbative dynamics of Goldstone-Boson scattering off $D_{(s)}$ and $D^*_{(s)}$ mesons. Most importantly the ordering of the lightest strange and nonstrange scalars becomes natural. In this work we demonstrate for the first time that this mechanism is strongly supported by the recent high quality data on the ${B^-\to D^+\pi^-\pi^- }$ provided by the LHCb experiment. This implies that the lowest quark-model positive-parity charm mesons, together with their bottom counterparts, if realized in nature, do not form the ground-state multiplet. This is similar to the pattern that has been established for the scalar mesons made from light up, down and strange quarks, where the lowest multiplet is considered to be made of states not described by the quark model. In a broader view, the hadron spectrum must be viewed as more than a collection of quark model states. |
0901.0927 | Giacomo Cacciapaglia | Giacomo Cacciapaglia, Aldo Deandrea and Jeremie Llodra-Perez (Lyon,
IPN) | Higgs to Gamma Gamma beyond the Standard Model | 47 pages, 5 figures; references and UED case added | JHEP 0906:054,2009 | 10.1088/1126-6708/2009/06/054 | LYCEN 2008-13 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the H to gamma gamma decay process and the gluon fusion
production of a light Higgs, and provide a general framework for testing models
of new physics beyond the Standard Model. We apply our parametrisation to
typical models extending the Standard Model in 4 and 5 dimensions, and show how
the parametrisation can be used to discriminate between different scenarios of
new physics at the Large Hadron Collider and at future Linear Colliders.
| [
{
"created": "Wed, 7 Jan 2009 21:05:31 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jan 2009 14:24:09 GMT",
"version": "v2"
}
] | 2010-01-05 | [
[
"Cacciapaglia",
"Giacomo",
"",
"Lyon,\n IPN"
],
[
"Deandrea",
"Aldo",
"",
"Lyon,\n IPN"
],
[
"Llodra-Perez",
"Jeremie",
"",
"Lyon,\n IPN"
]
] | We consider the H to gamma gamma decay process and the gluon fusion production of a light Higgs, and provide a general framework for testing models of new physics beyond the Standard Model. We apply our parametrisation to typical models extending the Standard Model in 4 and 5 dimensions, and show how the parametrisation can be used to discriminate between different scenarios of new physics at the Large Hadron Collider and at future Linear Colliders. |
2012.07099 | Antonio Pich | Antonio Pich | Challenges for tau physics at the TeraZ | 5 pages. References updated. Matches final publication in Eur. Phys.
J. Plus | null | null | IFIC/20-52 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The very high statistics, low backgrounds and clean back-to-back kinematics
of a TeraZ facility would provide an optimal laboratory for precision
measurements of the $\tau$ properties. A few important topics in $\tau$ physics
where very relevant contributions could be made are highlighted.
| [
{
"created": "Sun, 13 Dec 2020 16:55:23 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Nov 2021 17:46:48 GMT",
"version": "v2"
}
] | 2021-11-15 | [
[
"Pich",
"Antonio",
""
]
] | The very high statistics, low backgrounds and clean back-to-back kinematics of a TeraZ facility would provide an optimal laboratory for precision measurements of the $\tau$ properties. A few important topics in $\tau$ physics where very relevant contributions could be made are highlighted. |
1206.3957 | Anton Ilderton | Victor Dinu, Thomas Heinzl, Anton Ilderton | Infra-red divergences in plane wave backgrounds | 15 pages, 7 figures | null | 10.1103/PhysRevD.86.085037 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the emission of soft photons via nonlinear Compton scattering in
a pulsed plane wave (laser field) is in general infra-red divergent. We give
examples of both soft and soft-collinear divergences, and we pay particular
attention to the case of crossed fields in both classical and quantum theories.
| [
{
"created": "Mon, 18 Jun 2012 14:50:17 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Dinu",
"Victor",
""
],
[
"Heinzl",
"Thomas",
""
],
[
"Ilderton",
"Anton",
""
]
] | We show that the emission of soft photons via nonlinear Compton scattering in a pulsed plane wave (laser field) is in general infra-red divergent. We give examples of both soft and soft-collinear divergences, and we pay particular attention to the case of crossed fields in both classical and quantum theories. |
hep-ph/9206255 | null | R. Sekhar Chivukula, Mitchell Golden, Dimitrios Kominis, and M. V.
Ramana | The Phenomenology of a Hidden Symmetry Breaking Sector | harvmac, 8 pages (4 figures), BUHEP-92-23 new version corrects error
in figures | Phys.Lett. B293 (1992) 400-404 | 10.1016/0370-2693(92)90903-H | null | hep-ph | null | We calculate the production rate of gauge-boson pairs at the SSC in a model
with a ``hidden'' electroweak symmetry breaking sector. We show that the signal
of electroweak symmetry breaking is lower than the background and that we
cannot necessarily rely on gauge boson pairs as a signal of the dynamics of
symmetry breaking.
| [
{
"created": "Fri, 26 Jun 1992 19:29:38 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Jul 1992 23:29:20 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Chivukula",
"R. Sekhar",
""
],
[
"Golden",
"Mitchell",
""
],
[
"Kominis",
"Dimitrios",
""
],
[
"Ramana",
"M. V.",
""
]
] | We calculate the production rate of gauge-boson pairs at the SSC in a model with a ``hidden'' electroweak symmetry breaking sector. We show that the signal of electroweak symmetry breaking is lower than the background and that we cannot necessarily rely on gauge boson pairs as a signal of the dynamics of symmetry breaking. |
hep-ph/9804347 | Mikhail Volkov | M. K. Volkov (JINR, Dubna, Russia), M. Nagy (Institute of Physics,
Bratislava, Slovakia), V. L. Yudichev (JINR, Dubna, Russia) | Scalar mesons in the Nambu--Jona-Lasinio model with 't Hooft interaction | LaTeX text, 8 pages | Nuovo Cim. A112 (1999) 225-232 | 10.1007/BF03035844 | E2-98-101 | hep-ph | null | We calculate the mass spectra of the pseudoscalar and scalar meson nonets in
the Nambu--Jona-Lasinio model with the 't Hooft interaction. We obtain
satisfactory result for the pseudoscalar mesons. For the scalar mesons, the 't
Hooft interaction somewhat increases the values of the masses. However, it is
not sufficient to explain the whole scalar mass spectrum. The situation could
be improved for the $\sigma$ and $f_0$ mesons through mixing with the glueball
state. For the description of the masses of $a_0$ and $\kstar$ mesons, it is
necessary to involve the other models. The strong decay widths of the scalar
mesons are described.
| [
{
"created": "Tue, 21 Apr 1998 19:44:05 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Apr 1998 08:29:35 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Apr 1998 17:24:21 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Volkov",
"M. K.",
"",
"JINR, Dubna, Russia"
],
[
"Nagy",
"M.",
"",
"Institute of Physics,\n Bratislava, Slovakia"
],
[
"Yudichev",
"V. L.",
"",
"JINR, Dubna, Russia"
]
] | We calculate the mass spectra of the pseudoscalar and scalar meson nonets in the Nambu--Jona-Lasinio model with the 't Hooft interaction. We obtain satisfactory result for the pseudoscalar mesons. For the scalar mesons, the 't Hooft interaction somewhat increases the values of the masses. However, it is not sufficient to explain the whole scalar mass spectrum. The situation could be improved for the $\sigma$ and $f_0$ mesons through mixing with the glueball state. For the description of the masses of $a_0$ and $\kstar$ mesons, it is necessary to involve the other models. The strong decay widths of the scalar mesons are described. |
1405.7168 | Henry Tsz-King Wong | Jiunn-Wei Chen, Hsin-Chang Chi, Hau-Bin Li, C.-P. Liu, Lakhwinder
Singh, Henry T. Wong, Chih-Liang Wu, and Chih-Pan Wu | Constraints on millicharged neutrinos via analysis of data from atomic
ionizations with germanium detectors at sub-keV sensitivities | 5 pages, 4 figures, 1 table ; Published Version as V2 | Phys. Rev. D 90, 011301(R) (2014) | 10.1103/PhysRevD.90.011301 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With the advent of detectors with sub-keV sensitivities, atomic ionization
has been identified as a promising avenue to probe possible neutrino
electromagnetic properties. The interaction cross-sections induced by
millicharged neutrinos are evaluated with the ab-initio multi-configuration
relativistic random-phase approximation. There is significant enhancement at
atomic binding energies compared to that when the electrons are taken as free
particles. Positive signals would distinctly manifest as peaks at specific
energies with known intensity ratios. Selected reactor neutrino data with
germanium detectors at analysis threshold as low as 300 eV are studied. No such
signatures are observed, and a combined limit on the neutrino charge fraction
of | \numq | < 1.0 X 10^{-12} at 90% confidence level is derived.
| [
{
"created": "Wed, 28 May 2014 09:14:37 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Jul 2014 04:00:33 GMT",
"version": "v2"
}
] | 2014-08-01 | [
[
"Chen",
"Jiunn-Wei",
""
],
[
"Chi",
"Hsin-Chang",
""
],
[
"Li",
"Hau-Bin",
""
],
[
"Liu",
"C. -P.",
""
],
[
"Singh",
"Lakhwinder",
""
],
[
"Wong",
"Henry T.",
""
],
[
"Wu",
"Chih-Liang",
""
],
[
"Wu",
"Chih-Pan",
""
]
] | With the advent of detectors with sub-keV sensitivities, atomic ionization has been identified as a promising avenue to probe possible neutrino electromagnetic properties. The interaction cross-sections induced by millicharged neutrinos are evaluated with the ab-initio multi-configuration relativistic random-phase approximation. There is significant enhancement at atomic binding energies compared to that when the electrons are taken as free particles. Positive signals would distinctly manifest as peaks at specific energies with known intensity ratios. Selected reactor neutrino data with germanium detectors at analysis threshold as low as 300 eV are studied. No such signatures are observed, and a combined limit on the neutrino charge fraction of | \numq | < 1.0 X 10^{-12} at 90% confidence level is derived. |
hep-ph/9511306 | Alexander Belyaev | A. Belyaev, E. Boos L. Dudko, A. Pukhov (Institute of Nuclear Physics,
Moscow State University) | W+2jets production at Tevatron -- VECBOS and CompHEP comparison | 8 pages including 4 figures as a gzipped postscript file | null | null | D0 Note 2784, November 13, 1995 | hep-ph | null | Results of calculation of all subprocesses in proton-antiproton collisions
which contribute to the W+2jets final state are presented at Tevatron energy.
The calculation has been carried out by means of the CompHEP software package.
A detail comparison with VECBOS generator results for cross sections and
various distributions shows an agreement at the level of Monte-Carlo accuracy.
Therefore the additional independent check of VECBOS generator has been done.
In complement to the VECBOS generator a new generator based on CompHEP allows
to study individual subprocesses like $Wb\bar{b}$ or $Wc\bar{c}$. The last
point is important, for instance, for study $Wb\bar{b}$ part of the background
for single top or Standard Model Higgs signal at Tevatron.
| [
{
"created": "Tue, 14 Nov 1995 00:40:16 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Nov 1995 02:43:40 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Belyaev",
"A.",
"",
"Institute of Nuclear Physics,\n Moscow State University"
],
[
"Dudko",
"E. Boos L.",
"",
"Institute of Nuclear Physics,\n Moscow State University"
],
[
"Pukhov",
"A.",
"",
"Institute of Nuclear Physics,\n Moscow State University"
]
] | Results of calculation of all subprocesses in proton-antiproton collisions which contribute to the W+2jets final state are presented at Tevatron energy. The calculation has been carried out by means of the CompHEP software package. A detail comparison with VECBOS generator results for cross sections and various distributions shows an agreement at the level of Monte-Carlo accuracy. Therefore the additional independent check of VECBOS generator has been done. In complement to the VECBOS generator a new generator based on CompHEP allows to study individual subprocesses like $Wb\bar{b}$ or $Wc\bar{c}$. The last point is important, for instance, for study $Wb\bar{b}$ part of the background for single top or Standard Model Higgs signal at Tevatron. |
hep-ph/0104130 | Roberto Contino | Roberto Contino, Luigi Pilo | A Note on Regularization methods in Kaluza-Klein Theories | 5 pages, 1 figure. v2: A minor comment corrected, conclusion
unchanged. v3: A comment and a final note added. Version accepted for
publication in Physics Letters B | Phys.Lett. B523 (2001) 347-350 | 10.1016/S0370-2693(01)01352-1 | null | hep-ph | null | We comment on the presence of power-like divergences in Kaluza-Klein theories
with supersymmetry breaking a l\`a Scherk-Schwarz. By introducing a SUSY
preserving regulator, we show that, in the context of a recently model proposed
by Barbieri, Hall and Nomura, the Higgs mass is finite and unambiguously
defined. The same result applies to similar models.
| [
{
"created": "Thu, 12 Apr 2001 20:44:33 GMT",
"version": "v1"
},
{
"created": "Fri, 18 May 2001 16:52:22 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Oct 2001 09:11:37 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Contino",
"Roberto",
""
],
[
"Pilo",
"Luigi",
""
]
] | We comment on the presence of power-like divergences in Kaluza-Klein theories with supersymmetry breaking a l\`a Scherk-Schwarz. By introducing a SUSY preserving regulator, we show that, in the context of a recently model proposed by Barbieri, Hall and Nomura, the Higgs mass is finite and unambiguously defined. The same result applies to similar models. |
1412.3798 | Alfredo Urbano | Alfredo Urbano, Wei Xue | Constraining the Higgs portal with antiprotons | 31 pages, 12 figures, 2 tables | null | null | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The scalar Higgs portal is a compelling model of dark matter (DM) in which a
renormalizable coupling with the Higgs boson provides the connection between
the visible world and the dark sector. In this paper we investigate the
constraint placed on the parameter space of this model by the antiproton data.
Due to the fact that the antiproton-to-proton ratio has relative less
systematic uncertainties than the antiproton absolute flux, we propose and
explore the possibility to combine all the available $\bar{p}/p$ data.
Following this approach, we are able to obtain stronger limits if compared with
the existing literature. In particular, we show that most of the parameter
space close to the Higgs resonance is ruled out by our analysis. Furthermore,
by studying the reach of the future AMS-02 antiproton and antideuteron data, we
argue that a DM mass of $\mathcal{O}(150)$ GeV offers a promising discovery
potential. The method of combining all the antiproton-to-proton ratio data
proposed in this paper is quite general, and can be straightforwardly applied
to other models.
| [
{
"created": "Thu, 11 Dec 2014 20:59:58 GMT",
"version": "v1"
}
] | 2014-12-12 | [
[
"Urbano",
"Alfredo",
""
],
[
"Xue",
"Wei",
""
]
] | The scalar Higgs portal is a compelling model of dark matter (DM) in which a renormalizable coupling with the Higgs boson provides the connection between the visible world and the dark sector. In this paper we investigate the constraint placed on the parameter space of this model by the antiproton data. Due to the fact that the antiproton-to-proton ratio has relative less systematic uncertainties than the antiproton absolute flux, we propose and explore the possibility to combine all the available $\bar{p}/p$ data. Following this approach, we are able to obtain stronger limits if compared with the existing literature. In particular, we show that most of the parameter space close to the Higgs resonance is ruled out by our analysis. Furthermore, by studying the reach of the future AMS-02 antiproton and antideuteron data, we argue that a DM mass of $\mathcal{O}(150)$ GeV offers a promising discovery potential. The method of combining all the antiproton-to-proton ratio data proposed in this paper is quite general, and can be straightforwardly applied to other models. |
1612.06863 | Luca Marzola | Laur J\"arv, Kristjan Kannike, Luca Marzola, Antonio Racioppi, Martti
Raidal, Mihkel R\"unkla, Margus Saal, Hardi Veerm\"ae | A frame independent classification of single field inflationary models | 7 pages; Added a paragraph on new directions in model building and
modified the adopted notation. Matches the version to appear on PRL | Phys. Rev. Lett. 118, 151302 (2017) | 10.1103/PhysRevLett.118.151302 | null | hep-ph astro-ph.CO gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Seemingly unrelated models of inflation that originate from different
physical setups yield, in some cases, identical predictions for the currently
constrained inflationary observables. In order to classify the available
models, we propose to express the slow-roll parameters and the relevant
observables in terms of frame and reparametrisation invariant quantities. The
adopted invariant formalism makes manifest the redundancy that afflicts the
current description of inflation dynamics and offers a straightforward way to
identify classes of models which yield identical phenomenology. In this Letter
we offer a step-to-step recipe to recast every single field inflationary model
in the proposed formalism, detailing also the procedure to compute inflationary
observables in terms of frame and reparametrisation invariant quantities. We
hope that our results become the cornerstone of a new categorisation of viable
inflationary models and open the way to a deeper understanding of the inflation
mechanism.
| [
{
"created": "Tue, 20 Dec 2016 21:00:02 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Mar 2017 07:39:15 GMT",
"version": "v2"
}
] | 2017-04-19 | [
[
"Järv",
"Laur",
""
],
[
"Kannike",
"Kristjan",
""
],
[
"Marzola",
"Luca",
""
],
[
"Racioppi",
"Antonio",
""
],
[
"Raidal",
"Martti",
""
],
[
"Rünkla",
"Mihkel",
""
],
[
"Saal",
"Margus",
""
],
[
"Veermäe",
"Hardi",
""
]
] | Seemingly unrelated models of inflation that originate from different physical setups yield, in some cases, identical predictions for the currently constrained inflationary observables. In order to classify the available models, we propose to express the slow-roll parameters and the relevant observables in terms of frame and reparametrisation invariant quantities. The adopted invariant formalism makes manifest the redundancy that afflicts the current description of inflation dynamics and offers a straightforward way to identify classes of models which yield identical phenomenology. In this Letter we offer a step-to-step recipe to recast every single field inflationary model in the proposed formalism, detailing also the procedure to compute inflationary observables in terms of frame and reparametrisation invariant quantities. We hope that our results become the cornerstone of a new categorisation of viable inflationary models and open the way to a deeper understanding of the inflation mechanism. |
2001.10737 | Christian Bierlich | Christian Bierlich, Andy Buckley, Christian Holm Christensen, Peter
Harald Lindenov Christiansen, Cody B. Duncan, Jan Fiete Grosse-Oetringhaus,
Przemyslaw Karczmarczyk, Patrick Kirchgae{\ss}er, Jochen Klein, Leif
L\"onnblad, Roberto Preghenella, Christine O. Rasmussen, Maria Stefaniak, and
Vytautas Vislavicus | Confronting Experimental Data with Heavy-Ion Models: Rivet for Heavy
Ions | 31 pages, 12 figures | null | 10.1140/epjc/s10052-020-8033-4 | LU TP 20-04, MCNET-20-04 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Rivet library is an important toolkit in particle physics, and serves as
a repository for analysis data and code. It allows for comparisons between data
and theoretical calculations of the final state of collision events. This paper
outlines several recent additions and improvements to the framework to include
support for analysis of heavy ion collision simulated data. The paper also
presents examples of these recent developments and their applicability in
implementing concrete physics analyses.
| [
{
"created": "Wed, 29 Jan 2020 09:15:11 GMT",
"version": "v1"
}
] | 2020-06-24 | [
[
"Bierlich",
"Christian",
""
],
[
"Buckley",
"Andy",
""
],
[
"Christensen",
"Christian Holm",
""
],
[
"Christiansen",
"Peter Harald Lindenov",
""
],
[
"Duncan",
"Cody B.",
""
],
[
"Grosse-Oetringhaus",
"Jan Fiete",
""
],
[
"Karczmarczyk",
"Przemyslaw",
""
],
[
"Kirchgaeßer",
"Patrick",
""
],
[
"Klein",
"Jochen",
""
],
[
"Lönnblad",
"Leif",
""
],
[
"Preghenella",
"Roberto",
""
],
[
"Rasmussen",
"Christine O.",
""
],
[
"Stefaniak",
"Maria",
""
],
[
"Vislavicus",
"Vytautas",
""
]
] | The Rivet library is an important toolkit in particle physics, and serves as a repository for analysis data and code. It allows for comparisons between data and theoretical calculations of the final state of collision events. This paper outlines several recent additions and improvements to the framework to include support for analysis of heavy ion collision simulated data. The paper also presents examples of these recent developments and their applicability in implementing concrete physics analyses. |
1601.00913 | Thomas E. Baker | Thomas E. Baker | Reproducing sterile neutrinos and the behavior of flavor oscillations
with superconducting-magnetic proximity effects | 16 pages, 7 figures | null | null | null | hep-ph astro-ph.HE cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The physics of a superconductor subjected to a magnetic field is known to be
equivalent to neutrino oscillations. Examining the properties of
singlet-triplet oscillations in the magnetic field, a sterile neutrino--shown
to be a Majorana fermion--is suggested to be represented by singlet Cooper
pairs and moderates flavor oscillations between three flavor neutrinos (triplet
Cooper pairs). A superconductor-exchange spring system's rotating magnetization
profile is used to simulate the mass-flavor oscillations in the neutrino case
and the physics of neutrino oscillations are discussed. Symmetry protected
triplet components are presented as weak process states. Phases acquired due to
the Fulde-Ferrell-Larkin-Ovchinnikov effect produce a complex phase that may be
responsible for charge-parity violation in flavor oscillations.
| [
{
"created": "Tue, 5 Jan 2016 17:31:12 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Feb 2016 22:11:22 GMT",
"version": "v2"
}
] | 2016-02-16 | [
[
"Baker",
"Thomas E.",
""
]
] | The physics of a superconductor subjected to a magnetic field is known to be equivalent to neutrino oscillations. Examining the properties of singlet-triplet oscillations in the magnetic field, a sterile neutrino--shown to be a Majorana fermion--is suggested to be represented by singlet Cooper pairs and moderates flavor oscillations between three flavor neutrinos (triplet Cooper pairs). A superconductor-exchange spring system's rotating magnetization profile is used to simulate the mass-flavor oscillations in the neutrino case and the physics of neutrino oscillations are discussed. Symmetry protected triplet components are presented as weak process states. Phases acquired due to the Fulde-Ferrell-Larkin-Ovchinnikov effect produce a complex phase that may be responsible for charge-parity violation in flavor oscillations. |
1607.03749 | Zhi Xiao | Zhi Xiao | The Impact of Lorentz Violation on the Klein Tunneling Effect | 3 pages, 1 figures, Presented at the Seventh Meeting on CPT and
Lorentz Symmetry, Bloomington, Indiana, June 20-24, 2016 | null | 10.1103/PhysRevD.93.125022 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the impact of a tiny Lorentz-violating $b^\mu$ term on the one
dimensional motion of a Dirac particle scattering on a rectangular barrier. We
assume the experiment is performed in a particular inertial frame, where the
components of $b^\mu$ are assumed constants. The results show that
Lorentz-violation modification to the transmission rate depends on the observer
Lorentz nature of $b^\mu$. For a spacelike or lightlike $b^\mu$ the induced
resonant frequency shift depends on the polarization, while for timelike
$b^\mu$ there is essentially no modification.
| [
{
"created": "Tue, 12 Jul 2016 01:32:54 GMT",
"version": "v1"
}
] | 2016-07-20 | [
[
"Xiao",
"Zhi",
""
]
] | We discuss the impact of a tiny Lorentz-violating $b^\mu$ term on the one dimensional motion of a Dirac particle scattering on a rectangular barrier. We assume the experiment is performed in a particular inertial frame, where the components of $b^\mu$ are assumed constants. The results show that Lorentz-violation modification to the transmission rate depends on the observer Lorentz nature of $b^\mu$. For a spacelike or lightlike $b^\mu$ the induced resonant frequency shift depends on the polarization, while for timelike $b^\mu$ there is essentially no modification. |
hep-ph/0604194 | Pavel Baikov | P.A. Baikov, K.G. Chetyrkin | Top Quark Mediated Higgs Decay into Hadrons to Order alpha(s)**5 | 4 pages, the final text published in Phys. Rev. Lett | Phys.Rev.Lett. 97 (2006) 061803 | 10.1103/PhysRevLett.97.061803 | SFB/CPP-06-19, TTP06-14 | hep-ph | null | We present in analytic form the O(alpha_s^5) correction to the H->gg partial
width of the standard-model Higgs boson with intermediate mass M_H<2M_t. Its
knowledge is useful because the O(alpha_s^4) correction is sizeable (around
20%). For M_H=120 GeV, the resulting QCD correction factor reads
1 + (215/12) alpha_s^(5)(M_H)/pi
+ 152.5 (alpha_s^(5)(M_H)/pi)^2
+ 381.5 (alpha_s^(5)(M_H)/pi)^3
\approx 1+0.65+0.20+0.02.
The new four-loop correction increases the total Higgs-boson hadronic width
by a small amount of order 1 promille and stabilizes significantly the residual
scale dependence.
| [
{
"created": "Sat, 22 Apr 2006 16:28:01 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Sep 2006 16:16:07 GMT",
"version": "v2"
}
] | 2016-09-06 | [
[
"Baikov",
"P. A.",
""
],
[
"Chetyrkin",
"K. G.",
""
]
] | We present in analytic form the O(alpha_s^5) correction to the H->gg partial width of the standard-model Higgs boson with intermediate mass M_H<2M_t. Its knowledge is useful because the O(alpha_s^4) correction is sizeable (around 20%). For M_H=120 GeV, the resulting QCD correction factor reads 1 + (215/12) alpha_s^(5)(M_H)/pi + 152.5 (alpha_s^(5)(M_H)/pi)^2 + 381.5 (alpha_s^(5)(M_H)/pi)^3 \approx 1+0.65+0.20+0.02. The new four-loop correction increases the total Higgs-boson hadronic width by a small amount of order 1 promille and stabilizes significantly the residual scale dependence. |
hep-ph/0203188 | Josephine Bolosan | Sandip Pakvasa and Probir Roy | Constraining four neutrino mass patterns from neutrinoless double beta
decay | One equation and three entries in a table have been changed, some
typographical errors corrected and a few references added. The basic
conclusions are not changed. To be published in Physics Letters. B., 9 pages,
4 figures | Phys.Lett. B535 (2002) 181-186 | 10.1016/S0370-2693(02)01763-X | UH511-996-02 | hep-ph astro-ph hep-ex | null | All existing data on neutrino oscillations (including those from the LSND
experiment) imply a four neutrino scheme with six different allowed mass
patterns. Some of the latter are shown to be disfavored by using a conservative
upper bound on the $\beta beta 0 \nu$ nuclear decay rate, if neutrinos are
assumed to be Majorana particles. Comparisons are also made with restrictions
from tritium $\beta$-decay and cosmology.
| [
{
"created": "Tue, 19 Mar 2002 21:57:55 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Apr 2002 21:51:10 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Pakvasa",
"Sandip",
""
],
[
"Roy",
"Probir",
""
]
] | All existing data on neutrino oscillations (including those from the LSND experiment) imply a four neutrino scheme with six different allowed mass patterns. Some of the latter are shown to be disfavored by using a conservative upper bound on the $\beta beta 0 \nu$ nuclear decay rate, if neutrinos are assumed to be Majorana particles. Comparisons are also made with restrictions from tritium $\beta$-decay and cosmology. |
1007.1835 | Joerg Jaeckel | O.K. Baker, G. Cantatore, J. Jaeckel and G. Mueller | Notes from the 3rd Axion Strategy Meeting | 5 pages, 1 figure | AIP Conf.Proc.1274:175-179,2010 | 10.1063/1.3489551 | DCPT/10/110; IPPP/10/55 | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note we briefly summarize the main future targets and strategies for
axion and general low energy particle physics identified in the "3rd axion
strategy meeting" held during the AXIONS 2010 workshop. This summary follows a
wide discussion with contributions from many of the workshop attendees.
| [
{
"created": "Mon, 12 Jul 2010 07:21:30 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Baker",
"O. K.",
""
],
[
"Cantatore",
"G.",
""
],
[
"Jaeckel",
"J.",
""
],
[
"Mueller",
"G.",
""
]
] | In this note we briefly summarize the main future targets and strategies for axion and general low energy particle physics identified in the "3rd axion strategy meeting" held during the AXIONS 2010 workshop. This summary follows a wide discussion with contributions from many of the workshop attendees. |
1201.6287 | Kei Yagyu | Shinya Kanemura, Kei Yagyu | Radiative corrections to electroweak parameters in the Higgs triplet
model and implication with the recent Higgs boson searches | 17 pages, 23 figures, version published in PRD, title slightly
modified | null | 10.1103/PhysRevD.85.115009 | UT-HET 064 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study radiative corrections to the electroweak parameters in the Higgs
model with the Y=1 triplet field, which is introduced in the scenario of
generating neutrino masses based on the so-called type II seesaw mechanism. In
this model, the rho parameter deviates from unity at the tree level.
Consequently, the electroweak sector of the model is described by the four
input parameters such as $\alpha_{\text{em}}$, $G_F$, $m_Z$ and
$\sin^2\theta_W$. We calculate the one loop contribution to the W boson mass as
well as to the rho parameter in order to clarify the possible mass spectrum of
the extra Higgs bosons under the constraint from the electroweak precision
data. We find that the hierarchical mass spectrum among $H^{\pm\pm}$, $H^{\pm}$
and $A$ (or $H$) is favored by the precision data especially for the case of
$m_A$ $(\simeq m_H)>m_{H^+}>m_{H^{++}}$, where $H^{\pm\pm}$, $H^{\pm}$, $A$ and
$H$ are the doubly-charged, singly-charged, CP-odd and CP-even Higgs bosons
mainly originated from the triplet field. We also discuss phenomenological
consequences of such a mass spectrum with relatively large mass splitting. The
decay rate of the Higgs boson decay into two photons is evaluated under the
constraint from the electroweak precision data, regarding the recent Higgs
boson searches at the CERN LHC.
| [
{
"created": "Mon, 30 Jan 2012 17:20:09 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Jun 2012 04:54:48 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Kanemura",
"Shinya",
""
],
[
"Yagyu",
"Kei",
""
]
] | We study radiative corrections to the electroweak parameters in the Higgs model with the Y=1 triplet field, which is introduced in the scenario of generating neutrino masses based on the so-called type II seesaw mechanism. In this model, the rho parameter deviates from unity at the tree level. Consequently, the electroweak sector of the model is described by the four input parameters such as $\alpha_{\text{em}}$, $G_F$, $m_Z$ and $\sin^2\theta_W$. We calculate the one loop contribution to the W boson mass as well as to the rho parameter in order to clarify the possible mass spectrum of the extra Higgs bosons under the constraint from the electroweak precision data. We find that the hierarchical mass spectrum among $H^{\pm\pm}$, $H^{\pm}$ and $A$ (or $H$) is favored by the precision data especially for the case of $m_A$ $(\simeq m_H)>m_{H^+}>m_{H^{++}}$, where $H^{\pm\pm}$, $H^{\pm}$, $A$ and $H$ are the doubly-charged, singly-charged, CP-odd and CP-even Higgs bosons mainly originated from the triplet field. We also discuss phenomenological consequences of such a mass spectrum with relatively large mass splitting. The decay rate of the Higgs boson decay into two photons is evaluated under the constraint from the electroweak precision data, regarding the recent Higgs boson searches at the CERN LHC. |
2003.10416 | Oscar Mac\'ias | Kevork N. Abazajian, Shunsaku Horiuchi, Manoj Kaplinghat, Ryan E.
Keeley and Oscar Macias | Strong constraints on thermal relic dark matter from Fermi-LAT
observations of the Galactic Center | 23 pages, 14 figures. V2: more IC rings included, profile likelihood
corrected, more tests added; main results and conclusions unchanged. V3:
corrected typo found in Tab. II. Matches version published in PRD | Phys. Rev. D 102, 043012 (2020) | 10.1103/PhysRevD.102.043012 | null | hep-ph astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The extended excess toward the Galactic Center (GC) in gamma rays inferred
from Fermi-LAT observations has been interpreted as being due to dark matter
(DM) annihilation. Here, we perform new likelihood analyses of the GC and show
that, when including templates for the stellar galactic and nuclear bulges, the
GC shows no significant detection of a DM annihilation template, even after
generous variations in the Galactic diffuse emission models and a wide range of
DM halo profiles. We include Galactic diffuse emission models with combinations
of three-dimensional inverse Compton maps, variations of interstellar gas maps,
and a central source of electrons. For the DM profile, we include both
spherical and ellipsoidal DM morphologies and a range of radial profiles from
steep cusps to kiloparsec-sized cores, motivated in part by hydrodynamical
simulations. Our derived upper limits on the dark matter annihilation flux
place strong constraints on DM properties. In the case of the pure $b$-quark
annihilation channel, our limits on the annihilation cross section are more
stringent than those from the Milky Way dwarfs up to DM masses of approximately
TeV and rule out the thermal relic cross section up to approximately 300 GeV.
Better understanding of the DM profile, as well as the Fermi-LAT data at its
highest energies, would further improve the sensitivity to DM properties.
| [
{
"created": "Mon, 23 Mar 2020 17:44:40 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Aug 2020 18:41:55 GMT",
"version": "v2"
},
{
"created": "Mon, 25 Jan 2021 20:53:04 GMT",
"version": "v3"
}
] | 2021-01-27 | [
[
"Abazajian",
"Kevork N.",
""
],
[
"Horiuchi",
"Shunsaku",
""
],
[
"Kaplinghat",
"Manoj",
""
],
[
"Keeley",
"Ryan E.",
""
],
[
"Macias",
"Oscar",
""
]
] | The extended excess toward the Galactic Center (GC) in gamma rays inferred from Fermi-LAT observations has been interpreted as being due to dark matter (DM) annihilation. Here, we perform new likelihood analyses of the GC and show that, when including templates for the stellar galactic and nuclear bulges, the GC shows no significant detection of a DM annihilation template, even after generous variations in the Galactic diffuse emission models and a wide range of DM halo profiles. We include Galactic diffuse emission models with combinations of three-dimensional inverse Compton maps, variations of interstellar gas maps, and a central source of electrons. For the DM profile, we include both spherical and ellipsoidal DM morphologies and a range of radial profiles from steep cusps to kiloparsec-sized cores, motivated in part by hydrodynamical simulations. Our derived upper limits on the dark matter annihilation flux place strong constraints on DM properties. In the case of the pure $b$-quark annihilation channel, our limits on the annihilation cross section are more stringent than those from the Milky Way dwarfs up to DM masses of approximately TeV and rule out the thermal relic cross section up to approximately 300 GeV. Better understanding of the DM profile, as well as the Fermi-LAT data at its highest energies, would further improve the sensitivity to DM properties. |
1201.5580 | J.D. Vergados | J.D. Vergados (Physics Department, University of Ioannina, Ioannina,
Greece) | Predicted rates for direct WIMP searches | 8 pages, 2 tables,6 figures. To appear in the proceedings of the
workshop "The Dark Side of the Universe (DSU 2011)" organized by KITPC,
Beijing, September 26-30, 2011 | null | 10.1088/1742-6596/384/1/012023 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The differential event rate for direct detection of dark matter, both the
time averaged and the modulated one due to the motion of the Earth, are
discussed. The calculations focus on relatively light cold dark matter
candidates (WIMP) and low energy transfers. It is shown that for some WIMP
masses the modulation amplitude may change sign. This effect can be exploited
to yield information about the mass of the dark matter candidate.
| [
{
"created": "Thu, 26 Jan 2012 17:05:34 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Vergados",
"J. D.",
"",
"Physics Department, University of Ioannina, Ioannina,\n Greece"
]
] | The differential event rate for direct detection of dark matter, both the time averaged and the modulated one due to the motion of the Earth, are discussed. The calculations focus on relatively light cold dark matter candidates (WIMP) and low energy transfers. It is shown that for some WIMP masses the modulation amplitude may change sign. This effect can be exploited to yield information about the mass of the dark matter candidate. |
hep-ph/9806324 | Tom Steele | V. Elias, T. G. Steele, F. Chishtie, R. Migneron and K. Sprague | Pade-Improvement of QCD Running Coupling Constants, Running Masses,
Higgs Decay Rates, and Scalar Channel Sum Rules | latex, 22 pages, 8 figures, references corrected | Phys.Rev. D58 (1998) 116007 | 10.1103/PhysRevD.58.116007 | null | hep-ph | null | We discuss Pad\'e-improvement of known four-loop order results based upon an
asymptotic three-parameter error formula for Pad\'e-approximants. We derive an
explicit formula estimating the next-order coefficient $R_4$ from the previous
coefficients in a series $1+R_1 x + R_2x^2 + R_3x^3$. We show that such an
estimate is within 0.18% of the known five-loop order term in the O(1)
$\beta$-function, and within 10% of the known five-loop term in the O(1)
anomalous mass-dimension function $\gamma_m(g)$. We apply the same formula to
generate a [2$|$2] Pad\'e-summation of the QCD $\beta$-function and anomalous
mass dimension in order to demonstrate both the relative insensitivity of the
evolution of $\alpha_s(\mu)$ and the running quark masses to higher order
corrections, as well as a somewhat increased compatibility of the present
empirical range for $\alpha_s(m_\tau)$ with the range anticipated via evolution
from the present empirical range for $\alpha_s(M_z)$. For $3 \leq n_f \leq 6$
we demonstrate that positive zeros of any [2$|$2] Pad\'e-summation estimate of
the all-orders $\beta$-function which incorporates known two-, three-, and
four-loop contributions necessarily correspond to ultraviolet fixed points,
regardless of the unknown five-loop term. Pad\'e-improvement of higher-order
perturbative expressions is presented for the decay rates of the Higgs into two
gluons and into a $b \bar{b}$ pair, and is used to show the relative
insensitivity of these rates to higher order effects. However,
Pad\'e-improvement of the purely-perturbative component of scalar/pseudoscalar
current correlation functions is indicative of large theoretical uncertainties
in QCD sum rules for these channels, particularly if the continuum-threshold
parameter $s_0$ is near 1 GeV$^2$.
| [
{
"created": "Tue, 9 Jun 1998 19:47:12 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jun 1998 16:12:58 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Jun 1998 15:07:15 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Elias",
"V.",
""
],
[
"Steele",
"T. G.",
""
],
[
"Chishtie",
"F.",
""
],
[
"Migneron",
"R.",
""
],
[
"Sprague",
"K.",
""
]
] | We discuss Pad\'e-improvement of known four-loop order results based upon an asymptotic three-parameter error formula for Pad\'e-approximants. We derive an explicit formula estimating the next-order coefficient $R_4$ from the previous coefficients in a series $1+R_1 x + R_2x^2 + R_3x^3$. We show that such an estimate is within 0.18% of the known five-loop order term in the O(1) $\beta$-function, and within 10% of the known five-loop term in the O(1) anomalous mass-dimension function $\gamma_m(g)$. We apply the same formula to generate a [2$|$2] Pad\'e-summation of the QCD $\beta$-function and anomalous mass dimension in order to demonstrate both the relative insensitivity of the evolution of $\alpha_s(\mu)$ and the running quark masses to higher order corrections, as well as a somewhat increased compatibility of the present empirical range for $\alpha_s(m_\tau)$ with the range anticipated via evolution from the present empirical range for $\alpha_s(M_z)$. For $3 \leq n_f \leq 6$ we demonstrate that positive zeros of any [2$|$2] Pad\'e-summation estimate of the all-orders $\beta$-function which incorporates known two-, three-, and four-loop contributions necessarily correspond to ultraviolet fixed points, regardless of the unknown five-loop term. Pad\'e-improvement of higher-order perturbative expressions is presented for the decay rates of the Higgs into two gluons and into a $b \bar{b}$ pair, and is used to show the relative insensitivity of these rates to higher order effects. However, Pad\'e-improvement of the purely-perturbative component of scalar/pseudoscalar current correlation functions is indicative of large theoretical uncertainties in QCD sum rules for these channels, particularly if the continuum-threshold parameter $s_0$ is near 1 GeV$^2$. |
1506.06542 | Go Mishima | Y. Kiyo, G. Mishima, Y. Sumino | Strong IR Cancellation in Heavy Quarkonium and Precise Top Mass
Determination | 17 pages, 7 figures, 3 tables; Revisions in ver.2: We added (i) a
more conservative error estimate of m_t determination, (ii) discussion on
u=+1 and u=-1 renormalons, (iii) interpretation of PS-scheme | JHEP 11 084 (2015) | 10.1007/JHEP11(2015)084 | TU-997, UT-15-20 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Combining recent perturbative analyses on the static QCD potential and the
quark pole mass, we find that, for the heavy quarkonium states $c\bar{c}$,
$b\bar{b}$ and $t\bar{t}$, (1) ultra-soft (US) corrections in the binding
energies are small, and (2) there is a stronger cancellation of IR
contributions than what has been predicted by renormalon dominance hypothesis.
By contrast, for a hypothetical heavy quarkonium system with a small number of
active quark flavors ($n_l\approx 0$), we observe evidence that renormalon
dominance holds accurately and that non-negligible contributions from US
corrections exist. In addition, we examine contributions of renormalons at $u=-
1$. As an important consequence, we improve on a previous prediction for
possible achievable accuracy of top quark $\overline{\rm MS}$--mass measurement
at a future linear collider and estimate that in principle 20--30~MeV accuracy
is reachable.
| [
{
"created": "Mon, 22 Jun 2015 10:36:27 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Nov 2015 16:51:21 GMT",
"version": "v2"
}
] | 2015-11-20 | [
[
"Kiyo",
"Y.",
""
],
[
"Mishima",
"G.",
""
],
[
"Sumino",
"Y.",
""
]
] | Combining recent perturbative analyses on the static QCD potential and the quark pole mass, we find that, for the heavy quarkonium states $c\bar{c}$, $b\bar{b}$ and $t\bar{t}$, (1) ultra-soft (US) corrections in the binding energies are small, and (2) there is a stronger cancellation of IR contributions than what has been predicted by renormalon dominance hypothesis. By contrast, for a hypothetical heavy quarkonium system with a small number of active quark flavors ($n_l\approx 0$), we observe evidence that renormalon dominance holds accurately and that non-negligible contributions from US corrections exist. In addition, we examine contributions of renormalons at $u=- 1$. As an important consequence, we improve on a previous prediction for possible achievable accuracy of top quark $\overline{\rm MS}$--mass measurement at a future linear collider and estimate that in principle 20--30~MeV accuracy is reachable. |
1103.4613 | Francisco Campanario | G. Bozzi, F. Campanario, M. Rauch and D. Zeppenfeld | W\gamma \gamma production with leptonic decays at NLO QCD | 18 pages, 13 figures | Phys.Rev.D83:114035,2011 | 10.1103/PhysRevD.83.114035 | FTUV-11-0324,IFUM-971-FT,KA-TP-08--2011,LPN11-14,SFB/CPP-11-14 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The computation of the NLO-QCD corrections to the cross sections for W \gamma
\gamma production in hadronic collisions is presented. We consider the case of
real photons in the final state, but include full leptonic decays of the W.
Numerical results for the LHC and the Tevatron are obtained through a parton
level Monte Carlo based on the structure of the VBFNLO program, allowing an
easy implementation of general cuts and distributions. We show the dependence
on scale variations of the integrated cross sections and provide evidence of
the fact that NLO QCD corrections strongly modify the LO predictions for
observables at the LHC both in magnitude and in shape.
| [
{
"created": "Wed, 23 Mar 2011 20:00:09 GMT",
"version": "v1"
}
] | 2011-07-05 | [
[
"Bozzi",
"G.",
""
],
[
"Campanario",
"F.",
""
],
[
"Rauch",
"M.",
""
],
[
"Zeppenfeld",
"D.",
""
]
] | The computation of the NLO-QCD corrections to the cross sections for W \gamma \gamma production in hadronic collisions is presented. We consider the case of real photons in the final state, but include full leptonic decays of the W. Numerical results for the LHC and the Tevatron are obtained through a parton level Monte Carlo based on the structure of the VBFNLO program, allowing an easy implementation of general cuts and distributions. We show the dependence on scale variations of the integrated cross sections and provide evidence of the fact that NLO QCD corrections strongly modify the LO predictions for observables at the LHC both in magnitude and in shape. |
1111.5643 | Giovanni Amelino-Camelia | Giovanni Amelino-Camelia | Particle-dependent deformations of Lorentz symmetry | v2: added one more example of conservation law for interactions
involving particles with different relativistic properties | null | null | null | hep-ph gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I here investigate what is arguably the most significant residual challenge
for the proposal of phenomenologically viable "DSR deformations" of
relativistic kinematics, which concerns the description of composite particles,
such as atoms. In some approaches to the formalization of possible scenarios
for DSR-deformation of Lorentz symmetry it emerges that composite particles
should have relativistic properties different from the ones of their
constituent "fundamental particles", but these previous results provided no
clue as to how the mismatch of relativistic properties could be consistently
implemented. I show that it is possible to implement a fully consistent
DSR-relativistic description of kinematics endowing different types of
particles with suitably different deformed-Lorentz-symmetry properties. I also
contemplate the possibility that some types of particles (or macroscopic
bodies) behave according to completely undeformed special relativity, which in
particular might apply to the DSR description of the macroscopic bodies that
constitute measuring devices ("observers"). The formalization is also
applicable to cases where different fundamental particles have different
relativistic properties, leading to a type of phenomenology which I illustrate
by considering possible applications to the ongoing analyses of the
"Lorentz-symmetry anomaly" that was recently tentatively reported by the OPERA
collaboration. Some of the new elements here introduced in the formulation of
relativistic kinematics appear to also provide the starting point for the
development of a correspondingly novel mathematical formulation of
spacetime-symmetry algebras.
| [
{
"created": "Wed, 23 Nov 2011 22:42:19 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Dec 2011 17:11:21 GMT",
"version": "v2"
}
] | 2011-12-15 | [
[
"Amelino-Camelia",
"Giovanni",
""
]
] | I here investigate what is arguably the most significant residual challenge for the proposal of phenomenologically viable "DSR deformations" of relativistic kinematics, which concerns the description of composite particles, such as atoms. In some approaches to the formalization of possible scenarios for DSR-deformation of Lorentz symmetry it emerges that composite particles should have relativistic properties different from the ones of their constituent "fundamental particles", but these previous results provided no clue as to how the mismatch of relativistic properties could be consistently implemented. I show that it is possible to implement a fully consistent DSR-relativistic description of kinematics endowing different types of particles with suitably different deformed-Lorentz-symmetry properties. I also contemplate the possibility that some types of particles (or macroscopic bodies) behave according to completely undeformed special relativity, which in particular might apply to the DSR description of the macroscopic bodies that constitute measuring devices ("observers"). The formalization is also applicable to cases where different fundamental particles have different relativistic properties, leading to a type of phenomenology which I illustrate by considering possible applications to the ongoing analyses of the "Lorentz-symmetry anomaly" that was recently tentatively reported by the OPERA collaboration. Some of the new elements here introduced in the formulation of relativistic kinematics appear to also provide the starting point for the development of a correspondingly novel mathematical formulation of spacetime-symmetry algebras. |
1712.05180 | Laura Duarte | Alexandre Alves, M. Dias, F. de Campos, L. Duarte, J. M. Hoff da Silva | Constraining Elko Dark Matter at the LHC with Monophoton Events | 6 pages, 4 figures | null | 10.1209/0295-5075/121/31001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A mass dimension one fermion, also known as Elko, constitutes a dark matter
candidate which might interact with photons at the tree level in a specific
fashion. In this work, we investigate the constraints imposed by unitarity and
LHC data on this type of interactions using the search for new physics in
monophoton events. We found that Elkos which can explain the dark matter relic
abundance mainly through electromagnetic interactions are excluded at the
95\%CL by the 8 TeV LHC data for masses up to 1 TeV.
| [
{
"created": "Thu, 14 Dec 2017 11:36:04 GMT",
"version": "v1"
}
] | 2018-04-18 | [
[
"Alves",
"Alexandre",
""
],
[
"Dias",
"M.",
""
],
[
"de Campos",
"F.",
""
],
[
"Duarte",
"L.",
""
],
[
"da Silva",
"J. M. Hoff",
""
]
] | A mass dimension one fermion, also known as Elko, constitutes a dark matter candidate which might interact with photons at the tree level in a specific fashion. In this work, we investigate the constraints imposed by unitarity and LHC data on this type of interactions using the search for new physics in monophoton events. We found that Elkos which can explain the dark matter relic abundance mainly through electromagnetic interactions are excluded at the 95\%CL by the 8 TeV LHC data for masses up to 1 TeV. |
2106.15945 | Vivek Kumar Nautiyal | Vivek Kumar Nautiyal, Bipin Singh Koranga, Ashish Shrivastava, Neelam
Das | Matter Effects on Mass Square Difference for Four Flavor Neutrino
Oscillation | 7 pages, 1 figures, 5 tables | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We consider the matter effects on four flavor neutrino oscillation scheme
(3+1). In presence of sterile neutrino, the simplest four flavor neutrino
mixing there are six mixing angles and three Dirac CP phases. In this paper, we
discuss about the sensitivity of mass square difference effects Delta21,
Delta31, and Delta41 in the matter. We find that in presence of sterile
neutrino for four flavor mixing framework, only solar mass square difference
Delta21 and atmospheric neutrino mass square difference Delta31 change for
different values of Dirac phases and energy. There is no change of sterile
neutrino mass square differences. In this letter, we study the matter effects
on neutrino mass square differences Delta21, Delta31, and Delta41 and calculate
the percentage change with respect to the mass square difference in the matter
by varying energy for four flavor framework.
| [
{
"created": "Wed, 30 Jun 2021 09:54:06 GMT",
"version": "v1"
}
] | 2021-07-01 | [
[
"Nautiyal",
"Vivek Kumar",
""
],
[
"Koranga",
"Bipin Singh",
""
],
[
"Shrivastava",
"Ashish",
""
],
[
"Das",
"Neelam",
""
]
] | We consider the matter effects on four flavor neutrino oscillation scheme (3+1). In presence of sterile neutrino, the simplest four flavor neutrino mixing there are six mixing angles and three Dirac CP phases. In this paper, we discuss about the sensitivity of mass square difference effects Delta21, Delta31, and Delta41 in the matter. We find that in presence of sterile neutrino for four flavor mixing framework, only solar mass square difference Delta21 and atmospheric neutrino mass square difference Delta31 change for different values of Dirac phases and energy. There is no change of sterile neutrino mass square differences. In this letter, we study the matter effects on neutrino mass square differences Delta21, Delta31, and Delta41 and calculate the percentage change with respect to the mass square difference in the matter by varying energy for four flavor framework. |
hep-ph/9703350 | null | K.-I. Izawa and T. Yanagida | R-invariant Natural Unification | 14 pages, latex | Prog.Theor.Phys. 97 (1997) 913-920 | 10.1143/PTP.97.913 | UT-770 | hep-ph | null | We construct R-invariant unification models where a pair of massless Higgs
doublets is naturally obtained. The masslessness of the Higgs doublets is
guaranteed by the unbroken R symmetry. Mass generation for the Higgs doublets
is considered from various viewpoints.
| [
{
"created": "Tue, 18 Mar 1997 06:57:01 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Izawa",
"K. -I.",
""
],
[
"Yanagida",
"T.",
""
]
] | We construct R-invariant unification models where a pair of massless Higgs doublets is naturally obtained. The masslessness of the Higgs doublets is guaranteed by the unbroken R symmetry. Mass generation for the Higgs doublets is considered from various viewpoints. |
2011.13685 | Priyank Parashari | Arindam Mazumdar, Subhendra Mohanty, Priyank Parashari | Flavour specific neutrino self-interaction: $H_0$ tension and IceCube | 25 Pages, 10 figures, 7 tables, matches the version published in JCAP | null | 10.1088/1475-7516/2022/10/011 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Self-interaction in the active neutrinos is studied in the literature to
alleviate the $H_0$ tension. Similar self-interaction can also explain the
observed dips in the flux of the neutrinos coming from the distant
astro-physical sources in IceCube detectors. In contrast to the flavour
universal neutrino interaction considered for solving the $H_0$ tension, which
is ruled out from particle physics experiments, we consider flavour specific
neutrino interactions. We show that the values of self-interaction coupling
constant and mediator mass required for explaining the IceCube dips are
inconsistent with the strong neutrino self-interactions preferred by the
combination of BAO, HST and Planck data. However, the required amount of
self-interaction between tau neutrinos ($\nu_\tau$) in inverted hierarchy for
explaining IceCube dips is consistent with the moderate self-interaction region
of cosmological bounds at 1-$\sigma$ level. For the case of other interactions
and hierarchies, the IceCube preferred amount of self-interaction is consistent
with moderate self-interaction region of cosmological bounds at 2-$\sigma$
level only.
| [
{
"created": "Fri, 27 Nov 2020 11:51:21 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jan 2021 17:47:52 GMT",
"version": "v2"
},
{
"created": "Mon, 28 Nov 2022 14:02:14 GMT",
"version": "v3"
}
] | 2022-11-29 | [
[
"Mazumdar",
"Arindam",
""
],
[
"Mohanty",
"Subhendra",
""
],
[
"Parashari",
"Priyank",
""
]
] | Self-interaction in the active neutrinos is studied in the literature to alleviate the $H_0$ tension. Similar self-interaction can also explain the observed dips in the flux of the neutrinos coming from the distant astro-physical sources in IceCube detectors. In contrast to the flavour universal neutrino interaction considered for solving the $H_0$ tension, which is ruled out from particle physics experiments, we consider flavour specific neutrino interactions. We show that the values of self-interaction coupling constant and mediator mass required for explaining the IceCube dips are inconsistent with the strong neutrino self-interactions preferred by the combination of BAO, HST and Planck data. However, the required amount of self-interaction between tau neutrinos ($\nu_\tau$) in inverted hierarchy for explaining IceCube dips is consistent with the moderate self-interaction region of cosmological bounds at 1-$\sigma$ level. For the case of other interactions and hierarchies, the IceCube preferred amount of self-interaction is consistent with moderate self-interaction region of cosmological bounds at 2-$\sigma$ level only. |
hep-ph/9805245 | Andrzej Rostworowski | Michal Praszalowicz (1,2), Andrzej Rostworowski (2) ((1)
Ruhr-University Bochum, (2) Jagellonian University Krakow) | Spectrum of the Odderon Charge for Arbitrary Conformal Weights | 10 pages, 3 figures | Acta Phys.Polon. B30 (1999) 349-357 | null | TPJU-8/98 | hep-ph | null | The odderon equation is studied in terms of the variable suggested by the
modular invariance of the 3 Reggeon system. Odderon charge is identified with
the cross-product of three conformal spins. A complete set of commuting
operators: h^2 and q is diagonalized and quantization conditions for
eigenvalues of the odderon charge q are solved for arbitrary conformal weight
h.
| [
{
"created": "Thu, 7 May 1998 09:49:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Praszalowicz",
"Michal",
""
],
[
"Rostworowski",
"Andrzej",
""
]
] | The odderon equation is studied in terms of the variable suggested by the modular invariance of the 3 Reggeon system. Odderon charge is identified with the cross-product of three conformal spins. A complete set of commuting operators: h^2 and q is diagonalized and quantization conditions for eigenvalues of the odderon charge q are solved for arbitrary conformal weight h. |
0810.0409 | Jonathan Butterworth | Jonathan M. Butterworth, Adam R. Davison, Mathieu Rubin, Gavin P.
Salam | Jet substructure as a new Higgs search channel at the Large Hadron
Collider | Talk presented by J.M.Butterworth at 34th International Conference on
High Energy Physics, ICHEP08, Philadelphia, July 2008 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that W H and Z H production where the Higgs boson decays to bbbar can
be recovered as good search channels for the Standard Model Higgs at the Large
Hadron Collider. This is done by requiring the Higgs to have high transverse
momentum, and employing state-of-the-art jet reconstruction and decomposition
techniques.
| [
{
"created": "Thu, 2 Oct 2008 13:07:20 GMT",
"version": "v1"
}
] | 2008-10-03 | [
[
"Butterworth",
"Jonathan M.",
""
],
[
"Davison",
"Adam R.",
""
],
[
"Rubin",
"Mathieu",
""
],
[
"Salam",
"Gavin P.",
""
]
] | We show that W H and Z H production where the Higgs boson decays to bbbar can be recovered as good search channels for the Standard Model Higgs at the Large Hadron Collider. This is done by requiring the Higgs to have high transverse momentum, and employing state-of-the-art jet reconstruction and decomposition techniques. |
1211.5539 | Vladimir Saleev | M. A. Nefedov, N. N. Nikolaev, V. A. Saleev | Drell-Yan lepton pair production at high energies in the Parton
Reggeization Approach | 16 pages, 11 figures | Phys.Rev. D87 (2013) 014022 | 10.1103/PhysRevD.87.014022 | DESY 12-220 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | According to extensive theoretical studies of the high energy limit of QCD,
inelastic interactions are dominated by the multi-Regge final states. The
appropriate gauge-invariant objects, which simultaneously incorporate the
transverse momentum degrees of freedom, are Reggeized gluons, quarks and
antiquarks. In the present communication we extend parton Reggeization approach
to Drell-Yan production of massive lepton pairs. The basic ingredient is a
process of Reggeized quark-antiquark annihilation, which is described by the
Reggeon-Reggeon-photon effective vertex. We calculate transverse-momentum and
invariant-mass distributions of Drell-Yan lepton pairs measured at the CERN
SPS, FNAL Tevatron and CERN LHC in the different ranges of energy and rapidity.
We focus on angular distributions of Drell-Yan leptons in different kinematical
ranges. The obtained results are compared with the existing data and a good
agreement is found. The predictions for future experiments for Drell-Yan lepton
pair production at the CERN LHC have been made.
| [
{
"created": "Fri, 23 Nov 2012 16:24:00 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Nov 2012 10:52:28 GMT",
"version": "v2"
}
] | 2013-04-22 | [
[
"Nefedov",
"M. A.",
""
],
[
"Nikolaev",
"N. N.",
""
],
[
"Saleev",
"V. A.",
""
]
] | According to extensive theoretical studies of the high energy limit of QCD, inelastic interactions are dominated by the multi-Regge final states. The appropriate gauge-invariant objects, which simultaneously incorporate the transverse momentum degrees of freedom, are Reggeized gluons, quarks and antiquarks. In the present communication we extend parton Reggeization approach to Drell-Yan production of massive lepton pairs. The basic ingredient is a process of Reggeized quark-antiquark annihilation, which is described by the Reggeon-Reggeon-photon effective vertex. We calculate transverse-momentum and invariant-mass distributions of Drell-Yan lepton pairs measured at the CERN SPS, FNAL Tevatron and CERN LHC in the different ranges of energy and rapidity. We focus on angular distributions of Drell-Yan leptons in different kinematical ranges. The obtained results are compared with the existing data and a good agreement is found. The predictions for future experiments for Drell-Yan lepton pair production at the CERN LHC have been made. |
hep-ph/9606324 | Ahmed Ali | A. Ali (DESY, Hamburg) | $B$ Decays, Flavour Mixings and CP Violation in the Standard Model | 87 pages, 15 figures (require epsf.sty, rotate, epsf bounding box
macro embedded). Five lectures presented at the XX International Nathiagali
Summer College on Physics and Contemporary Needs, Bhurban, Pakistan, June 24
- July 11, 1995; to be published in the Proceedings (Nova Science Publishers,
New York). Dedicated to Professor Abdus Salam on his 70th Birthday. Report
No. DESY 96-106, June 1996 | null | null | null | hep-ph | null | These lectures review the progress made in our present understanding of $B$
decays. The emphasis here is on applications of QCD to $B$ decays and the
attendant perturbative and non-perturbative uncertainties, which limit present
theoretical precision in some cases but the overall picture that emerges is
consistent with the standard model (SM). This is illustrated by quantitatively
analyzing some of the key measurements in $B$ physics.
| [
{
"created": "Thu, 13 Jun 1996 16:18:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ali",
"A.",
"",
"DESY, Hamburg"
]
] | These lectures review the progress made in our present understanding of $B$ decays. The emphasis here is on applications of QCD to $B$ decays and the attendant perturbative and non-perturbative uncertainties, which limit present theoretical precision in some cases but the overall picture that emerges is consistent with the standard model (SM). This is illustrated by quantitatively analyzing some of the key measurements in $B$ physics. |
2407.12738 | Yongchao Zhang | P. S. Bhupal Dev, Doojin Kim, Deepak Sathyan, Kuver Sinha, Yongchao
Zhang | New Laboratory Constraints on Neutrinophilic Mediators | 7+3 pages, 4+0 figures and 0+1 table | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Neutrinophilic mediators are well-motivated messenger particles that can
probe some of the least known sectors of fundamental physics involving
nonstandard interactions of neutrinos with themselves and potentially with dark
matter. In particular, light mediators coupling to the active neutrinos will
induce new decay modes of the Standard Model mesons (e.g., $\pi^\pm, K^\pm \to
\ell^\pm + \nu + \phi$), charged leptons (e.g., $\tau^\pm \to \pi^\pm + \nu +
\phi$), and gauge bosons (e.g., $Z \to \nu + \bar{\nu} + \phi$). A common lore
is that these decays suffer from infrared divergences in the limit of the
vanishing mediator mass, i.e., $m_\phi \to 0$. Here, we show for the first time
that including the 1-loop contributions of these mediators to the standard
2-body decays (e.g., $\pi^\pm,\,K^\pm \to \ell^\pm + \nu$, etc.), the infrared
divergence from the 3-body decay cancels out exactly by virtue of the
Kinoshita-Lee-Nauenberg theorem. Including these cancellation effects, we then
update the existing laboratory constraints on neutrinophilic scalar mediators,
thereby extending the limits far beyond the decaying parent particle mass and
excluding a wider range of parameter space. These new "physical" limits derived
here have significant implications for the future detection prospects of
nonstandard neutrino (self-)interactions.
| [
{
"created": "Wed, 17 Jul 2024 16:58:43 GMT",
"version": "v1"
}
] | 2024-07-18 | [
[
"Dev",
"P. S. Bhupal",
""
],
[
"Kim",
"Doojin",
""
],
[
"Sathyan",
"Deepak",
""
],
[
"Sinha",
"Kuver",
""
],
[
"Zhang",
"Yongchao",
""
]
] | Neutrinophilic mediators are well-motivated messenger particles that can probe some of the least known sectors of fundamental physics involving nonstandard interactions of neutrinos with themselves and potentially with dark matter. In particular, light mediators coupling to the active neutrinos will induce new decay modes of the Standard Model mesons (e.g., $\pi^\pm, K^\pm \to \ell^\pm + \nu + \phi$), charged leptons (e.g., $\tau^\pm \to \pi^\pm + \nu + \phi$), and gauge bosons (e.g., $Z \to \nu + \bar{\nu} + \phi$). A common lore is that these decays suffer from infrared divergences in the limit of the vanishing mediator mass, i.e., $m_\phi \to 0$. Here, we show for the first time that including the 1-loop contributions of these mediators to the standard 2-body decays (e.g., $\pi^\pm,\,K^\pm \to \ell^\pm + \nu$, etc.), the infrared divergence from the 3-body decay cancels out exactly by virtue of the Kinoshita-Lee-Nauenberg theorem. Including these cancellation effects, we then update the existing laboratory constraints on neutrinophilic scalar mediators, thereby extending the limits far beyond the decaying parent particle mass and excluding a wider range of parameter space. These new "physical" limits derived here have significant implications for the future detection prospects of nonstandard neutrino (self-)interactions. |
0807.4206 | Fred Jegerlehner | F. Jegerlehner | The running fine structure constant alpha(E) via the Adler function | 7 pages, 6 figures | Nucl.Phys.Proc.Suppl.181-182:135-140,2008 | 10.1016/j.nuclphysbps.2008.09.010 | DESY 08-078 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an up-to-date analysis for a precise determination of the
effective fine structure constant and discuss the prospects for future
improvements. We advocate to use a determination monitored by the Adler
function which allows us to exploit perturbative QCD in an optimal well
controlled way. Together with a long term program of hadronic cross section
measurements at energies up to a few GeV, a determination of alpha(M_Z) at a
precision comparable to the one of the Z mass M_Z should be feasible. Presently
alpha(E) at E>1 GeV is the least precisely known of the fundamental parameters
of the SM. Since, in spite of substantial progress due to new BaBar exclusive
data, the region 1.4 to 2.4 GeV remains the most problematic one a major step
in the reduction of the uncertainties are expected from VEPP-2000 and from a
possible ``high-energy'' option DAFNE-2 at Frascati. The up-to-date evaluation
reads Delta alpha^{(5)}_{had}(M_Z^2) = 0.027515 +/- 0.000149 or
alpha^{-1}(M_Z)=128.957 +/- 0.020.
| [
{
"created": "Sat, 26 Jul 2008 00:12:13 GMT",
"version": "v1"
}
] | 2008-11-07 | [
[
"Jegerlehner",
"F.",
""
]
] | We present an up-to-date analysis for a precise determination of the effective fine structure constant and discuss the prospects for future improvements. We advocate to use a determination monitored by the Adler function which allows us to exploit perturbative QCD in an optimal well controlled way. Together with a long term program of hadronic cross section measurements at energies up to a few GeV, a determination of alpha(M_Z) at a precision comparable to the one of the Z mass M_Z should be feasible. Presently alpha(E) at E>1 GeV is the least precisely known of the fundamental parameters of the SM. Since, in spite of substantial progress due to new BaBar exclusive data, the region 1.4 to 2.4 GeV remains the most problematic one a major step in the reduction of the uncertainties are expected from VEPP-2000 and from a possible ``high-energy'' option DAFNE-2 at Frascati. The up-to-date evaluation reads Delta alpha^{(5)}_{had}(M_Z^2) = 0.027515 +/- 0.000149 or alpha^{-1}(M_Z)=128.957 +/- 0.020. |
2112.12547 | Olivier Lennon | Olivier Lennon | Non-Canonical Q-balls | 16+2 pages | null | null | OUTP-21-29P | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | Theories possessing non-canonical kinetic terms are often studied for Q-ball
states in an ad-hoc manner. This paper seeks to generalise their study for both
thin- and thick-wall Q-balls. Specifically, we show that theories whose
potential cannot house Q-balls can do so by virtue of their non-canonical
kinetic terms. Furthermore, we also constrain the theories that possess an
energetically stable thick-wall limit, with ramifications for their early
universe phenomenology.
| [
{
"created": "Tue, 21 Dec 2021 19:00:02 GMT",
"version": "v1"
}
] | 2021-12-24 | [
[
"Lennon",
"Olivier",
""
]
] | Theories possessing non-canonical kinetic terms are often studied for Q-ball states in an ad-hoc manner. This paper seeks to generalise their study for both thin- and thick-wall Q-balls. Specifically, we show that theories whose potential cannot house Q-balls can do so by virtue of their non-canonical kinetic terms. Furthermore, we also constrain the theories that possess an energetically stable thick-wall limit, with ramifications for their early universe phenomenology. |
hep-ph/0302015 | Luis G. Cabral-Rosetti | U. Solis, J. C. D'Olivo and L. G. Cabral-Rosetti | Neutrinos and Nucleosynthesis in Supernova | RevTex4 style, 3 pages including 1 figure. Presented at Mexican
School of Astrophysics 2002, Guanajuato, Mexico, 31 Jul - 7 Aug 2002. Final
version to appear in the Proceedings of IX Mexican Workshop on Particles and
Fields Physics Beyond the Standard Model, Colima Col. Mexico, November 17-22,
2003 | J.Phys.Conf.Ser. 37 (2006) 127-130 | 10.1088/1742-6596/37/1/021 | null | hep-ph | null | The type II supernova is considered as a candidate site for the production of
heavy elements. The nucleosynthesis occurs in an intense neutrino flux, we
calculate the electron fraction in this environment.
| [
{
"created": "Mon, 3 Feb 2003 23:07:47 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Feb 2003 22:55:15 GMT",
"version": "v2"
},
{
"created": "Sat, 12 Nov 2005 17:26:27 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Solis",
"U.",
""
],
[
"D'Olivo",
"J. C.",
""
],
[
"Cabral-Rosetti",
"L. G.",
""
]
] | The type II supernova is considered as a candidate site for the production of heavy elements. The nucleosynthesis occurs in an intense neutrino flux, we calculate the electron fraction in this environment. |
2307.14082 | Ijaz Ahmed | Ijaz Ahmed, Waqas Ahmad, M.S. Amjad, Jamil Muhammad | Observability of Parameter Space for Charged Higgs Boson in its bosonic
decays in Two Higgs Doublet Model Type-1 | 14 pages,20 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This study explores the possibility of discovering $H^{\pm}$ through its
bosonic decays, i.e. $H^{\pm}\rightarrow W^\pm\phi$ (where $\phi$ = h or A),
within the Type-I Two Higgs Doublet Model (2HDM). The main objective is to
demonstrate the available parameter space after applying the recent
experimental and theoretical exclusion limits. We suggest that for $m_{H^\pm}$
= 150 GeV is the most probable mass for the $H^\pm\rightarrow W^\pm\phi$ decay
channel in $pp$ collisions at $\sqrt{s}$ = 8, 13 and 14 TeV. Therefore we
propose that this channel may be used as an alternative to $H^\pm\rightarrow
\tau^\pm\nu$.
| [
{
"created": "Wed, 26 Jul 2023 10:11:19 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Oct 2023 16:46:20 GMT",
"version": "v2"
}
] | 2023-10-30 | [
[
"Ahmed",
"Ijaz",
""
],
[
"Ahmad",
"Waqas",
""
],
[
"Amjad",
"M. S.",
""
],
[
"Muhammad",
"Jamil",
""
]
] | This study explores the possibility of discovering $H^{\pm}$ through its bosonic decays, i.e. $H^{\pm}\rightarrow W^\pm\phi$ (where $\phi$ = h or A), within the Type-I Two Higgs Doublet Model (2HDM). The main objective is to demonstrate the available parameter space after applying the recent experimental and theoretical exclusion limits. We suggest that for $m_{H^\pm}$ = 150 GeV is the most probable mass for the $H^\pm\rightarrow W^\pm\phi$ decay channel in $pp$ collisions at $\sqrt{s}$ = 8, 13 and 14 TeV. Therefore we propose that this channel may be used as an alternative to $H^\pm\rightarrow \tau^\pm\nu$. |
hep-ph/9712207 | Wolf-Dieter Nowak | D. von Harrach (Univ. Mainz), W.-D. Nowak (DESY-IfH, Zeuthen), J.
Soffer (CNRS Marseille) | Theory Meets Experiment for the Determination of $\Delta G/G$ | 7 pages, LaTeX; Summary of the Discussion Session at the Topical
Workshop on 'Deep Inelastic Scattering off Polarized Targets: Theory Meets
Experiment', DESY-Zeuthen, September 1-5, 1997 | null | null | CPT-97/P.3564, DESY 97-232 | hep-ph | null | We briefly summarize the main points made during the discussion session on
the determination of $\Delta G/G$, where all Workshop participants were
strongly encouraged to contribute.
| [
{
"created": "Sun, 30 Nov 1997 10:14:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"von Harrach",
"D.",
"",
"Univ. Mainz"
],
[
"Nowak",
"W. -D.",
"",
"DESY-IfH, Zeuthen"
],
[
"Soffer",
"J.",
"",
"CNRS Marseille"
]
] | We briefly summarize the main points made during the discussion session on the determination of $\Delta G/G$, where all Workshop participants were strongly encouraged to contribute. |
2404.06793 | Yuki Watanabe | Ayuki Kamada, Takumi Kuwahara, Shigeki Matsumoto, Yu Watanabe, Yuki
Watanabe | Mediator Decay through mixing with Degenerate Spectrum | 27 pages, 11 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The decay of the mediator particle into standard model (SM) particles plays a
significant role in exploring the dark sector scenario.
We consider such a decay, taking the dark photon mediator as an example that
mixes with the SM photon.
We find that it requires a careful analysis of the decay rate in the presence
of an SM vector boson (e.g., $Z$ boson, $\rho$ meson, and true muonium, etc.)
nearly degenerate with the mediator particle in mass.
The decay rate of the mediator particle calculated in the mass eigenstate
basis {\bf does not} agree with the correct result, given by the imaginary
parts of the poles for the vector boson propagators, when the mixing parameter
is smaller than a specific value.
In such a case, the decay rate calculated by treating the mixing as a
perturbative parameter is in agreement with the correct result.
We clarify specific values for the mixing parameter quantitatively using
several concrete examples of the SM vector bosons degenerate with the dark
photon.
When the mass mixing between the vector boson and dark photon is smaller
(larger) than the decay width of the vector boson, the latter (former) method
to calculate the decay rate of the mediator particle gives the correct result.
| [
{
"created": "Wed, 10 Apr 2024 07:23:14 GMT",
"version": "v1"
}
] | 2024-04-11 | [
[
"Kamada",
"Ayuki",
""
],
[
"Kuwahara",
"Takumi",
""
],
[
"Matsumoto",
"Shigeki",
""
],
[
"Watanabe",
"Yu",
""
],
[
"Watanabe",
"Yuki",
""
]
] | The decay of the mediator particle into standard model (SM) particles plays a significant role in exploring the dark sector scenario. We consider such a decay, taking the dark photon mediator as an example that mixes with the SM photon. We find that it requires a careful analysis of the decay rate in the presence of an SM vector boson (e.g., $Z$ boson, $\rho$ meson, and true muonium, etc.) nearly degenerate with the mediator particle in mass. The decay rate of the mediator particle calculated in the mass eigenstate basis {\bf does not} agree with the correct result, given by the imaginary parts of the poles for the vector boson propagators, when the mixing parameter is smaller than a specific value. In such a case, the decay rate calculated by treating the mixing as a perturbative parameter is in agreement with the correct result. We clarify specific values for the mixing parameter quantitatively using several concrete examples of the SM vector bosons degenerate with the dark photon. When the mass mixing between the vector boson and dark photon is smaller (larger) than the decay width of the vector boson, the latter (former) method to calculate the decay rate of the mediator particle gives the correct result. |
hep-ph/0212094 | Adam K. Leibovich | Sean Fleming and Adam K Leibovich | The Photon Spectrum in Upsilon Decays | 27 pages, 11 figures | Phys.Rev. D67 (2003) 074035 | 10.1103/PhysRevD.67.074035 | CMU-HEP-02-13 and FERMILAB-Pub-02/295-T | hep-ph | null | We present a theoretical prediction for the photon spectrum in radiative
Upsilon decay. Parts of the spectrum have already been understood, but an
understanding of the endpoint region has remained elusive. In this paper we
provide the missing piece, and resolve a controversy in the literature. We
treat the endpoint region of Upsilon -> X gamma decay within the framework of
the soft-collinear effective theory (SCET). Within this approach the Upsilon
structure function arises naturally, and kinematic logarithms are summed by
running operators using renormalization group equations. In a previous paper we
studied the color-octet contribution to the decay. Here we treat the
color-singlet contribution. We combine our result with previous results to
obtain the Upsilon -> X gamma spectrum. We find that resumming the
color-singlet contribution in the endpoint gives a result that is in much
better agreement with the data than the leading order prediction.
| [
{
"created": "Thu, 5 Dec 2002 23:49:45 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Fleming",
"Sean",
""
],
[
"Leibovich",
"Adam K",
""
]
] | We present a theoretical prediction for the photon spectrum in radiative Upsilon decay. Parts of the spectrum have already been understood, but an understanding of the endpoint region has remained elusive. In this paper we provide the missing piece, and resolve a controversy in the literature. We treat the endpoint region of Upsilon -> X gamma decay within the framework of the soft-collinear effective theory (SCET). Within this approach the Upsilon structure function arises naturally, and kinematic logarithms are summed by running operators using renormalization group equations. In a previous paper we studied the color-octet contribution to the decay. Here we treat the color-singlet contribution. We combine our result with previous results to obtain the Upsilon -> X gamma spectrum. We find that resumming the color-singlet contribution in the endpoint gives a result that is in much better agreement with the data than the leading order prediction. |
1104.2404 | Simon de Visscher | Simon de Visscher, Michel Herquet | Automatic anomaly detection in high energy collider data | 5 pages, 2 figures | null | null | NIKHEF-2010-012 | hep-ph hep-ex physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address the problem of automatic anomaly detection in high energy collider
data. Our approach is based on the random generation of analytic expressions
for kinematical variables, which can then be evolved following a genetic
programming procedure to enhance their discriminating power. We apply this
approach to three concrete scenarios to demonstrate its possible usefulness,
both as a detailed check of reference Monte-Carlo simulations and as a model
independent tool for the detection of New Physics signatures.
| [
{
"created": "Wed, 13 Apr 2011 08:06:10 GMT",
"version": "v1"
}
] | 2011-04-14 | [
[
"de Visscher",
"Simon",
""
],
[
"Herquet",
"Michel",
""
]
] | We address the problem of automatic anomaly detection in high energy collider data. Our approach is based on the random generation of analytic expressions for kinematical variables, which can then be evolved following a genetic programming procedure to enhance their discriminating power. We apply this approach to three concrete scenarios to demonstrate its possible usefulness, both as a detailed check of reference Monte-Carlo simulations and as a model independent tool for the detection of New Physics signatures. |
hep-ph/9512401 | Esteban Roulet | A. Riotto and E. Roulet | Vacuum decay along supersymmetric flat directions | 12 pages, uuencoded latex file + 4 ps figures | Phys.Lett.B377:60-66,1996 | 10.1016/0370-2693(96)00313-9 | SISSA-95/163/EP, Fermilab-Pub-95/400-A | hep-ph astro-ph | null | It has been recently realized that within the Minimal Supersymmetric Standard
Model, for certain patterns of superpartner masses, consistent with all the
present experimental constraints, the scalar potential may develop at some
scale $Q_0$ unbounded color/charge breaking directions involving the sfermion
fields, and that these patterns are then excluded unless some new physics is
invoked at or below the scale $Q_0$. We reanalyze this observation and point
out that such patterns of superpartner masses at the weak scale are {\it not}
ruled out when taking into account the probability of decay for the metastable
color conserving minimum along these color breaking unbounded directions. It
turns out that the color conserving minimum, although metastable, has a
lifetime longer than the present age of the Universe and can survive both
quantum tunneling and the effects of high temperatures in the early Universe,
causing the color/charge breaking effects to be in practice not dangerous.
| [
{
"created": "Fri, 22 Dec 1995 08:26:57 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Riotto",
"A.",
""
],
[
"Roulet",
"E.",
""
]
] | It has been recently realized that within the Minimal Supersymmetric Standard Model, for certain patterns of superpartner masses, consistent with all the present experimental constraints, the scalar potential may develop at some scale $Q_0$ unbounded color/charge breaking directions involving the sfermion fields, and that these patterns are then excluded unless some new physics is invoked at or below the scale $Q_0$. We reanalyze this observation and point out that such patterns of superpartner masses at the weak scale are {\it not} ruled out when taking into account the probability of decay for the metastable color conserving minimum along these color breaking unbounded directions. It turns out that the color conserving minimum, although metastable, has a lifetime longer than the present age of the Universe and can survive both quantum tunneling and the effects of high temperatures in the early Universe, causing the color/charge breaking effects to be in practice not dangerous. |
1806.10940 | Selym Villalba-Chavez Dr. | Selym Villalba-Ch\'avez, Alina Golub, Carsten M\"uller | Axion-modified photon propagator, Coulomb potential and Lamb-shift | 16 pages, 10 figures | Phys. Rev. D 98, 115008 (2018) | 10.1103/PhysRevD.98.115008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A consistent renormalization of a quantum theory of axion-electrodynamics
requires terms beyond the minimal coupling of two photons to a neutral
pseudoscalar field. This procedure is used to determine the self-energy
operators of the electromagnetic and the axion fields with an accuracy of
second-order in the axion-diphoton coupling. The resulting polarization tensor
is utilized for establishing the axion-modified Coulomb potential of a static
pointlike charge. In connection, the plausible distortion of the Lamb-shift in
hydrogenlike atoms is established and the scopes for searching axionlike
particles in high-precision atomic spectroscopy and in experiments of
Cavendish-type are investigated. Particularly, we show that these hypothetical
degrees of freedom are ruled out as plausible candidates for explaining the
proton radius anomaly in muonic hydrogen. A certain loophole remains, though,
which is linked to the nonrenormalizable nature of axion-electrodynamics.
| [
{
"created": "Thu, 28 Jun 2018 13:13:39 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Dec 2018 10:45:30 GMT",
"version": "v2"
}
] | 2018-12-12 | [
[
"Villalba-Chávez",
"Selym",
""
],
[
"Golub",
"Alina",
""
],
[
"Müller",
"Carsten",
""
]
] | A consistent renormalization of a quantum theory of axion-electrodynamics requires terms beyond the minimal coupling of two photons to a neutral pseudoscalar field. This procedure is used to determine the self-energy operators of the electromagnetic and the axion fields with an accuracy of second-order in the axion-diphoton coupling. The resulting polarization tensor is utilized for establishing the axion-modified Coulomb potential of a static pointlike charge. In connection, the plausible distortion of the Lamb-shift in hydrogenlike atoms is established and the scopes for searching axionlike particles in high-precision atomic spectroscopy and in experiments of Cavendish-type are investigated. Particularly, we show that these hypothetical degrees of freedom are ruled out as plausible candidates for explaining the proton radius anomaly in muonic hydrogen. A certain loophole remains, though, which is linked to the nonrenormalizable nature of axion-electrodynamics. |
1103.1463 | Jean Cleymans | J. Cleymans, D. Worku | The Hagedorn temperature Revisited | 13 pages, 4 figures | null | 10.1142/S0217732311035584 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Hagedorn temperature, T_H is determined from the number of hadronic
resonances including all mesons and baryons. This leads to a stable result T_H
= 174 MeV consistent with the critical and the chemical freeze-out temperatures
at zero chemical potential. We use this result to calculate the speed of sound
and other thermodynamic quantities in the resonance hadron gas model for a wide
range of baryon chemical potentials following the chemical freeze-out curve. We
compare some of our results to those obtained previously in other papers.
| [
{
"created": "Tue, 8 Mar 2011 08:32:15 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Mar 2011 08:09:49 GMT",
"version": "v2"
},
{
"created": "Thu, 10 Mar 2011 08:53:00 GMT",
"version": "v3"
},
{
"created": "Mon, 14 Mar 2011 10:39:27 GMT",
"version": "v4"
}
] | 2015-05-27 | [
[
"Cleymans",
"J.",
""
],
[
"Worku",
"D.",
""
]
] | The Hagedorn temperature, T_H is determined from the number of hadronic resonances including all mesons and baryons. This leads to a stable result T_H = 174 MeV consistent with the critical and the chemical freeze-out temperatures at zero chemical potential. We use this result to calculate the speed of sound and other thermodynamic quantities in the resonance hadron gas model for a wide range of baryon chemical potentials following the chemical freeze-out curve. We compare some of our results to those obtained previously in other papers. |
hep-ph/0506177 | Thomas A. Trainor | Thomas A Trainor and Duncan J Prindle (STAR Collaboration) | Transverse Momentum Correlations in Relativistic Nuclear Collisions | 10 pages, 10 figures, proceedings, MIT workshop on fluctuations and
correlations in relativistic nuclear collisions | J.Phys.Conf.Ser. 27 (2005) 134-143 | 10.1088/1742-6596/27/1/015 | null | hep-ph | null | From the correlation structure of transverse momentum $p_t$ in relativistic
nuclear collisions we observe for the first time temperature/velocity structure
resulting from low-$Q^2$ partons. Our novel analysis technique does not invoke
an {\em a priori} jet hypothesis. $p_t$ autocorrelations derived from the scale
dependence of $<p_t>$ fluctuations reveal a complex parton dissipation process
in RHIC heavy ion collisions. We also observe structure which may result from
collective bulk-medium recoil in response to parton stopping.
| [
{
"created": "Fri, 17 Jun 2005 13:05:41 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Trainor",
"Thomas A",
"",
"STAR Collaboration"
],
[
"Prindle",
"Duncan J",
"",
"STAR Collaboration"
]
] | From the correlation structure of transverse momentum $p_t$ in relativistic nuclear collisions we observe for the first time temperature/velocity structure resulting from low-$Q^2$ partons. Our novel analysis technique does not invoke an {\em a priori} jet hypothesis. $p_t$ autocorrelations derived from the scale dependence of $<p_t>$ fluctuations reveal a complex parton dissipation process in RHIC heavy ion collisions. We also observe structure which may result from collective bulk-medium recoil in response to parton stopping. |
hep-ph/0209331 | Joaquim Matias | Joaquim Matias (CERN and Universitat Autonoma Barcelona) | Impact of B physics on model building and vice versa: an example | 20 pages, LaTeX | Nucl.Phys.Proc.Suppl.120:197-209,2003 | 10.1016/S0920-5632(03)01903-0 | CERN-TH/2002-248, UAB-FT-531 | hep-ph | null | We motivate that the start-up of the B factories has opened a new precision
flavour physics era, with an important effect on model building. Using as an
example a left-right model with spontaneous CP violation, we will show how the
inclusion of the new experimental data on B physics observables, together with
the old observables coming from kaon physics, has significantly widened our
capacity to strongly constrain the parameter space up to the point to exclude
models. On the contrary, using certain hypotheses, mainly concerning isospin,
we discuss how theory may help us to `test' the data on charged, neutral and
mixed $B \to \pi K$ decays once experimental errors will be reduced.
| [
{
"created": "Fri, 27 Sep 2002 13:17:27 GMT",
"version": "v1"
}
] | 2011-03-23 | [
[
"Matias",
"Joaquim",
"",
"CERN and Universitat Autonoma Barcelona"
]
] | We motivate that the start-up of the B factories has opened a new precision flavour physics era, with an important effect on model building. Using as an example a left-right model with spontaneous CP violation, we will show how the inclusion of the new experimental data on B physics observables, together with the old observables coming from kaon physics, has significantly widened our capacity to strongly constrain the parameter space up to the point to exclude models. On the contrary, using certain hypotheses, mainly concerning isospin, we discuss how theory may help us to `test' the data on charged, neutral and mixed $B \to \pi K$ decays once experimental errors will be reduced. |
hep-ph/9805224 | Stefan Groote | S. Groote, J.G. K\"orner and A.A. Pivovarov | A new technique for computing the spectral density of sunset-type
diagrams: integral transformation in configuration space | 13 pages in LaTeX, one PostScript figure included in the text | Phys.Lett. B443 (1998) 269-275 | 10.1016/S0370-2693(98)01324-0 | MZ-TH/98-12 | hep-ph nucl-th | null | We present a new method to investigate a class of diagrams which generalizes
the sunset topology to any number of massive internal lines. Our attention is
focused on the computation of the spectral density of these diagrams which is
related to many-body phase space in $D$ dimensional space-time. The spectral
density is determined by the inverse $K$-transform of the product of
propagators in configuration space. The inverse $K$-transform reduces to the
inverse Laplace transform in any odd number of space-time dimensions for which
we present an explicit analytical result.
| [
{
"created": "Tue, 5 May 1998 10:36:54 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Oct 1998 07:34:05 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Apr 2000 06:56:50 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Groote",
"S.",
""
],
[
"Körner",
"J. G.",
""
],
[
"Pivovarov",
"A. A.",
""
]
] | We present a new method to investigate a class of diagrams which generalizes the sunset topology to any number of massive internal lines. Our attention is focused on the computation of the spectral density of these diagrams which is related to many-body phase space in $D$ dimensional space-time. The spectral density is determined by the inverse $K$-transform of the product of propagators in configuration space. The inverse $K$-transform reduces to the inverse Laplace transform in any odd number of space-time dimensions for which we present an explicit analytical result. |
hep-ph/0307046 | Agustin Sabio-Vera | Agustin Sabio Vera (Cambridge U.) | Solution of the BFKL Equation at Next-to-leading Order | 5 pages, presented at the DIS 2003 Workshop, St. Peterburg, Russia,
23-27 April 2003 | null | null | Cavendish-HEP-03/06 | hep-ph | null | We solve the Balitsky-Fadin-Kuraev-Lipatov equation in the next-to-leading
logarithmic approximation for forward scattering with all conformal spins using
an iterative method.
| [
{
"created": "Thu, 3 Jul 2003 14:32:28 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Vera",
"Agustin Sabio",
"",
"Cambridge U."
]
] | We solve the Balitsky-Fadin-Kuraev-Lipatov equation in the next-to-leading logarithmic approximation for forward scattering with all conformal spins using an iterative method. |
1106.5071 | Zhenyu Han | Yang Bai and Zhenyu Han | Improving the Top Quark Forward-Backward Asymmetry Measurement at the
LHC | 26 pages, 11 figures | null | 10.1007/JHEP02(2012)135 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | At the LHC, top quark pairs are dominantly produced from gluons, making it
difficult to measure the top quark forward-backward asymmetry. To improve the
asymmetry measurement, we study variables that can distinguish between top
quarks produced from quarks and those from gluons: the invariant mass of the
top pair, the rapidity of the top-antitop system in the lab frame, the rapidity
of the top quark in the top-antitop rest frame, the top quark polarization and
the top-antitop spin correlation. We combine all the variables in a likelihood
discriminant method to separate quark-initiated events from gluon-initiated
events. We apply our method on models including G-prime's and W-prime's
motivated by the recent observation of a large top quark forward-backward
asymmetry at the Tevatron. We have found that the significance of the asymmetry
measurement can be improved by 10% to 30%. At the same time, the central values
of the asymmetry increase by 40% to 100%. We have also analytically derived the
best spin quantization axes for studying top quark polarization as well as
spin-correlation for the new physics models.
| [
{
"created": "Fri, 24 Jun 2011 21:50:21 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Bai",
"Yang",
""
],
[
"Han",
"Zhenyu",
""
]
] | At the LHC, top quark pairs are dominantly produced from gluons, making it difficult to measure the top quark forward-backward asymmetry. To improve the asymmetry measurement, we study variables that can distinguish between top quarks produced from quarks and those from gluons: the invariant mass of the top pair, the rapidity of the top-antitop system in the lab frame, the rapidity of the top quark in the top-antitop rest frame, the top quark polarization and the top-antitop spin correlation. We combine all the variables in a likelihood discriminant method to separate quark-initiated events from gluon-initiated events. We apply our method on models including G-prime's and W-prime's motivated by the recent observation of a large top quark forward-backward asymmetry at the Tevatron. We have found that the significance of the asymmetry measurement can be improved by 10% to 30%. At the same time, the central values of the asymmetry increase by 40% to 100%. We have also analytically derived the best spin quantization axes for studying top quark polarization as well as spin-correlation for the new physics models. |
hep-ph/0606208 | Hua-Xing Chen | Hua-Xing Chen, Atsushi Hosaka and Shi-Lin Zhu | Isospin symmetry breaking of K and K* mesons | 9 pages, 7 figures, one reference added | Phys.Rev.D74:033007,2006 | 10.1103/PhysRevD.74.033007 | null | hep-ph hep-ex | null | We use the method of QCD sum rules to investigate the isospin symmetry
breaking of K and K* mesons. The electromagnetic effect, difference between up
and down current-quark masses and difference between up and down quark
condensates are important. We perform sum rule analyses of their masses and
decay constant differences, which are consistent with experimental values. Our
results yield Delta f_K = f_{K^0} - f_{K^\pm} = 1.5 MeV.
| [
{
"created": "Tue, 20 Jun 2006 02:20:24 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jul 2006 02:41:07 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Chen",
"Hua-Xing",
""
],
[
"Hosaka",
"Atsushi",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] | We use the method of QCD sum rules to investigate the isospin symmetry breaking of K and K* mesons. The electromagnetic effect, difference between up and down current-quark masses and difference between up and down quark condensates are important. We perform sum rule analyses of their masses and decay constant differences, which are consistent with experimental values. Our results yield Delta f_K = f_{K^0} - f_{K^\pm} = 1.5 MeV. |
2001.08965 | Claudia Garcia-Garcia | Claudia Garcia-Garcia | New Physics Signals of the Electroweak Chiral Lagrangian in Vector Boson
Scattering at the LHC | PhD Thesis. Universidad Autonoma de Madrid. Defended the 15th of
October 2019. 183 pages + Appendices. 67 figures, 15 tables. Main text in
English. Introduction and Conclusion also in Spanish | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Standard Model of fundamental interactions, albeit an incredibly elegant
and successful theory, lacks explanations for some experimental and theoretical
open questions. Interestingly, many of these problems seem to be related to the
electroweak symmetry breaking sector of the theory, whose dynamical generation
is still unknown. Important questions such as what is the true nature of the
Higgs boson, why is its mass so light and so close to that of the electroweak
gauge bosons or whether the properties of this particle are the ones predicted
in the Standard Model remain unanswered. The LHC is our tool to unveil these
mysteries and vector boson scattering processes are the perfect window to
access them, since they are considered as the most sensitive observables to new
physics in the electroweak symmetry breaking sector. In this Thesis we employ
the effective electroweak chiral Lagrangian with a light Higgs, which assumes a
strongly interacting electroweak symmetry breaking sector, to perform a model
independent analysis of the phenomenology of vector boson scattering processes
at the LHC as well as to present quantitative predictions for the sensitivity
to possible beyond the Standard Model physics scenarios.
| [
{
"created": "Fri, 24 Jan 2020 12:40:14 GMT",
"version": "v1"
}
] | 2020-01-27 | [
[
"Garcia-Garcia",
"Claudia",
""
]
] | The Standard Model of fundamental interactions, albeit an incredibly elegant and successful theory, lacks explanations for some experimental and theoretical open questions. Interestingly, many of these problems seem to be related to the electroweak symmetry breaking sector of the theory, whose dynamical generation is still unknown. Important questions such as what is the true nature of the Higgs boson, why is its mass so light and so close to that of the electroweak gauge bosons or whether the properties of this particle are the ones predicted in the Standard Model remain unanswered. The LHC is our tool to unveil these mysteries and vector boson scattering processes are the perfect window to access them, since they are considered as the most sensitive observables to new physics in the electroweak symmetry breaking sector. In this Thesis we employ the effective electroweak chiral Lagrangian with a light Higgs, which assumes a strongly interacting electroweak symmetry breaking sector, to perform a model independent analysis of the phenomenology of vector boson scattering processes at the LHC as well as to present quantitative predictions for the sensitivity to possible beyond the Standard Model physics scenarios. |
2407.13815 | Kevin Langhoff | Simon Knapen, Kevin Langhoff, Zoltan Ligeti | Imprints of supersymmetry at a future Z factory | 13 pages, 6 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We study the discovery potential of Z branching ratios due to contributions
induced by the MSSM electroweak sector, assuming that the squarks and gluinos
are heavy. Precision measurements at a future Z factory would yield sensitivity
to MSSM that is complementary to direct searches at the LHC, provided that the
systematic uncertainties can be reduced to a level comparable to the expected
statistical uncertainties.
| [
{
"created": "Thu, 18 Jul 2024 18:00:00 GMT",
"version": "v1"
}
] | 2024-07-22 | [
[
"Knapen",
"Simon",
""
],
[
"Langhoff",
"Kevin",
""
],
[
"Ligeti",
"Zoltan",
""
]
] | We study the discovery potential of Z branching ratios due to contributions induced by the MSSM electroweak sector, assuming that the squarks and gluinos are heavy. Precision measurements at a future Z factory would yield sensitivity to MSSM that is complementary to direct searches at the LHC, provided that the systematic uncertainties can be reduced to a level comparable to the expected statistical uncertainties. |
2305.07536 | Aniello Quaranta | Antonio Capolupo, Salvatore Marco Giampaolo, Aniello Quaranta | Axion like particles, fifth force and neutron interferometry | Presented at DICE2022 conference | null | 10.1088/1742-6596/2533/1/012044 | null | hep-ph | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We report on recent result according to which the fermion-fermion interaction
mediated by axions and axion-like particles can be revealed by means of neutron
interferometry. We assume that the initial neutron beam is split in two beams
which are affected by differently oriented magnetic fields, in order that the
phase difference depends only by the axion-induced interaction. In this way,
the phase difference is directly related to the presence of axions.
| [
{
"created": "Fri, 12 May 2023 14:54:38 GMT",
"version": "v1"
}
] | 2024-03-06 | [
[
"Capolupo",
"Antonio",
""
],
[
"Giampaolo",
"Salvatore Marco",
""
],
[
"Quaranta",
"Aniello",
""
]
] | We report on recent result according to which the fermion-fermion interaction mediated by axions and axion-like particles can be revealed by means of neutron interferometry. We assume that the initial neutron beam is split in two beams which are affected by differently oriented magnetic fields, in order that the phase difference depends only by the axion-induced interaction. In this way, the phase difference is directly related to the presence of axions. |
2107.05352 | Gernot Eichmann | Gernot Eichmann, Jan M. Pawlowski, Jo\~ao M. Silva | On mass generation in Landau-gauge Yang-Mills theory | 33 pages, 24 figures. Identical to the version published in Phys.
Rev. D | null | 10.1103/PhysRevD.104.114016 | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A longstanding question in QCD is the origin of the mass gap in the
Yang-Mills sector of QCD, i.e., QCD without quarks. In Landau gauge QCD this
mass gap, and hence confinement, is encoded in a mass gap of the gluon
propagator, which is found both in lattice simulations and with functional
approaches. While functional methods are well suited to unravel the mechanism
behind the generation of the mass gap, a fully satisfactory answer has not yet
been found. In this work we solve the coupled Dyson-Schwinger equations for the
ghost propagator, gluon propagator and three-gluon vertex. We corroborate the
findings of earlier works, namely that the mass gap generation is tied to the
longitudinal projection of the gluon self-energy, which acts as an effective
mass term in the equations. Because an explicit mass term is in conflict with
gauge invariance, this leaves two possible scenarios: If it is viewed as an
artifact, only the scaling solution survives; if it is dynamical, gauge
invariance can only be preserved if there are longitudinal massless poles in
either of the vertices. We find that there is indeed a massless pole in the
ghost-gluon vertex, however in our approximation with the assumption of
complete infrared dominance of the ghost this pole is only present for the
scaling solution. We also put forward a possible mechanism that may reconcile
the scaling solution, with an infrared dominance of the ghost, with the
decoupling solutions based on longitudinal poles in the three-gluon vertex as
seen in the PT-BFM scheme.
| [
{
"created": "Mon, 12 Jul 2021 12:19:09 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Dec 2021 12:11:10 GMT",
"version": "v2"
}
] | 2021-12-22 | [
[
"Eichmann",
"Gernot",
""
],
[
"Pawlowski",
"Jan M.",
""
],
[
"Silva",
"João M.",
""
]
] | A longstanding question in QCD is the origin of the mass gap in the Yang-Mills sector of QCD, i.e., QCD without quarks. In Landau gauge QCD this mass gap, and hence confinement, is encoded in a mass gap of the gluon propagator, which is found both in lattice simulations and with functional approaches. While functional methods are well suited to unravel the mechanism behind the generation of the mass gap, a fully satisfactory answer has not yet been found. In this work we solve the coupled Dyson-Schwinger equations for the ghost propagator, gluon propagator and three-gluon vertex. We corroborate the findings of earlier works, namely that the mass gap generation is tied to the longitudinal projection of the gluon self-energy, which acts as an effective mass term in the equations. Because an explicit mass term is in conflict with gauge invariance, this leaves two possible scenarios: If it is viewed as an artifact, only the scaling solution survives; if it is dynamical, gauge invariance can only be preserved if there are longitudinal massless poles in either of the vertices. We find that there is indeed a massless pole in the ghost-gluon vertex, however in our approximation with the assumption of complete infrared dominance of the ghost this pole is only present for the scaling solution. We also put forward a possible mechanism that may reconcile the scaling solution, with an infrared dominance of the ghost, with the decoupling solutions based on longitudinal poles in the three-gluon vertex as seen in the PT-BFM scheme. |
0706.2972 | Mauro Napsuciale | M. Napsuciale, E. Oset, K. Sasaki, C. A. Vaquera-Araujo | Electron-positron annihilation into phi f_{0}(980) and clues for a new
1^{--} resonance | 18 pages, 4 figures | Phys.Rev.D76:074012,2007 | 10.1103/PhysRevD.76.074012 | null | hep-ph | null | We study the e^{+}e^{-} to phi pi pi reaction for pions in an isoscalar
s-wave which is dominated by loop mechanisms. For kaon loops we start from the
conventional RCHPT, but use the unitarized amplitude for KbarK-pipi scattering
and the full kaon form factor instead of the lowest order terms. We study also
effects of vector mesons using RCHPT supplemented with the conventional
anomalous term for VVP interactions and taking into account the effects of
heavy vector mesons in the K*K transition form factor. We find a peak in the
dipion invariant mass around the f_{0}(980) as in the experiment. Selecting the
phi f_{0}(980) contribution as a function of the e^{+}e^{-} energy we also
reproduce the experimental data except for a narrow peak, yielding support to
the existence of a 1^{--} resonance above the phi f_{0}(980) threshold,
coupling strongly to this state.
| [
{
"created": "Wed, 20 Jun 2007 11:59:14 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Oct 2007 17:01:43 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Napsuciale",
"M.",
""
],
[
"Oset",
"E.",
""
],
[
"Sasaki",
"K.",
""
],
[
"Vaquera-Araujo",
"C. A.",
""
]
] | We study the e^{+}e^{-} to phi pi pi reaction for pions in an isoscalar s-wave which is dominated by loop mechanisms. For kaon loops we start from the conventional RCHPT, but use the unitarized amplitude for KbarK-pipi scattering and the full kaon form factor instead of the lowest order terms. We study also effects of vector mesons using RCHPT supplemented with the conventional anomalous term for VVP interactions and taking into account the effects of heavy vector mesons in the K*K transition form factor. We find a peak in the dipion invariant mass around the f_{0}(980) as in the experiment. Selecting the phi f_{0}(980) contribution as a function of the e^{+}e^{-} energy we also reproduce the experimental data except for a narrow peak, yielding support to the existence of a 1^{--} resonance above the phi f_{0}(980) threshold, coupling strongly to this state. |
1308.1711 | Edcel John Salumbides | E. J. Salumbides, W. Ubachs, and V. I. Korobov | Bounds on fifth forces at the sub-Angstrom length scale | null | null | 10.1016/j.jms.2014.04.003 | null | hep-ph physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Constraints on a possible fifth-force interaction between hadrons are derived
based on an analysis of results from laser precision frequency measurements of
antiprotonic helium atoms, both $\bar{p}\,^{4}$He$^{+}$ and
$\bar{p}\,^{3}$He$^{+}$ species, and from experiments on resonant formation
rates of $dd\mu^{+}$-ions in muon-catalyzed fusion processes. A comparison is
made between accurate experimental data and first-principles theoretical
descriptions of the exotic systems within a quantum electrodynamical framework.
The agreement between theory and experiment sets limits on a possible
additional hadron-hadron interaction written in the form of a Yukawa potential
$V_5(r)=\alpha_5 \exp(-r/\lambda)/r$, with $\lambda$ representing the
characteristic length scale associated with the mass of a hypothetical
force-carrying particle via $\lambda=\hbar/(m_5c)$. The laser spectroscopic
data of antiprotonic helium set a constraint of $\alpha_5/\alpha_{EM} <
10^{-8}$ for $\lambda < 1$ \AA, while the binding energy of the muonic
molecular deuterium ion delivers a constraint of $\alpha_5/\alpha_{EM} \sim
10^{-5}$ for $\lambda < 0.05$ \AA, where $\alpha_{EM}$ represents the strength
of the electromagnetic interaction or the fine structure constant.
| [
{
"created": "Wed, 7 Aug 2013 22:51:14 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Aug 2013 12:48:35 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Salumbides",
"E. J.",
""
],
[
"Ubachs",
"W.",
""
],
[
"Korobov",
"V. I.",
""
]
] | Constraints on a possible fifth-force interaction between hadrons are derived based on an analysis of results from laser precision frequency measurements of antiprotonic helium atoms, both $\bar{p}\,^{4}$He$^{+}$ and $\bar{p}\,^{3}$He$^{+}$ species, and from experiments on resonant formation rates of $dd\mu^{+}$-ions in muon-catalyzed fusion processes. A comparison is made between accurate experimental data and first-principles theoretical descriptions of the exotic systems within a quantum electrodynamical framework. The agreement between theory and experiment sets limits on a possible additional hadron-hadron interaction written in the form of a Yukawa potential $V_5(r)=\alpha_5 \exp(-r/\lambda)/r$, with $\lambda$ representing the characteristic length scale associated with the mass of a hypothetical force-carrying particle via $\lambda=\hbar/(m_5c)$. The laser spectroscopic data of antiprotonic helium set a constraint of $\alpha_5/\alpha_{EM} < 10^{-8}$ for $\lambda < 1$ \AA, while the binding energy of the muonic molecular deuterium ion delivers a constraint of $\alpha_5/\alpha_{EM} \sim 10^{-5}$ for $\lambda < 0.05$ \AA, where $\alpha_{EM}$ represents the strength of the electromagnetic interaction or the fine structure constant. |
1012.2390 | Zralek Marek | Marek Zralek | 50 Years of Neutrino Physics | 23 pages, Lecture presented at the L Cracow School of Theoretical
Physics "Particle Physics at the Dawn of the LHC", Zakopane, Poland, June
9-19, 2010 | Acta Physica Polonica B vol. 41 (2011) page 2563 | null | null | hep-ph hep-ex physics.hist-ph | http://creativecommons.org/licenses/by-nc-sa/3.0/ | Some important topics from history of neutrino physics over the last fifty
years are discussed. History of neutrinos is older, at 4th December 2010 it
will be eightieth anniversary of the "neutrino birth". In that day W. Pauli
wrote the famous letter to participants of the physics conference at Tubingen
with the suggestion that "there could exist in the nuclei electrically neutral
particle". We will concentrate mostly on the 50 years of neutrino history just
to show the long tradition of the Zakopane Theoretical School.
| [
{
"created": "Fri, 10 Dec 2010 21:15:26 GMT",
"version": "v1"
}
] | 2011-01-18 | [
[
"Zralek",
"Marek",
""
]
] | Some important topics from history of neutrino physics over the last fifty years are discussed. History of neutrinos is older, at 4th December 2010 it will be eightieth anniversary of the "neutrino birth". In that day W. Pauli wrote the famous letter to participants of the physics conference at Tubingen with the suggestion that "there could exist in the nuclei electrically neutral particle". We will concentrate mostly on the 50 years of neutrino history just to show the long tradition of the Zakopane Theoretical School. |
hep-ph/9905390 | Markus A. Luty | Z. Chacko, Markus A. Luty, Ivan Maksymyk, Eduardo Ponton | Realistic Anomaly-mediated Supersymmetry Breaking | 32 pages, LaTeX2e, 3 eps figures | JHEP 0004 (2000) 001 | 10.1088/1126-6708/2000/04/001 | UMD-PP-99-102 | hep-ph | null | We consider supersymmetry breaking communicated entirely by the
superconformal anomaly in supergravity. This scenario is naturally realized if
supersymmetry is broken in a hidden sector whose couplings to the observable
sector are suppressed by more than powers of the Planck scale, as occurs if
supersymmetry is broken in a parallel universe living in extra dimensions. This
scenario is extremely predictive: soft supersymmetry breaking couplings are
completely determined by anomalous dimensions in the effective theory at the
weak scale. Gaugino and scalar masses are naturally of the same order, and
flavor-changing neutral currents are automatically suppressed. The most glaring
problem with this scenario is that slepton masses are negative in the minimal
supersymmetric standard model. We point out that this problem can be simply
solved by coupling extra Higgs doublets to the leptons. Lepton flavor-changing
neutral currents can be naturally avoided by approximate symmetries. We also
describe more speculative solutions involving compositeness near the weak
scale. We then turn to electroweak symmetry breaking. Adding an explicit \mu
term gives a value for B\mu that is too large by a factor of order 100. We
construct a realistic model in which the \mu term arises from the vacuum
expectation value of a singlet field, so all weak-scale masses are directly
related to m_{3/2}. We show that fully realistic electroweak symmetry breaking
can occur in this model with moderate fine-tuning.
| [
{
"created": "Tue, 18 May 1999 21:10:17 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Chacko",
"Z.",
""
],
[
"Luty",
"Markus A.",
""
],
[
"Maksymyk",
"Ivan",
""
],
[
"Ponton",
"Eduardo",
""
]
] | We consider supersymmetry breaking communicated entirely by the superconformal anomaly in supergravity. This scenario is naturally realized if supersymmetry is broken in a hidden sector whose couplings to the observable sector are suppressed by more than powers of the Planck scale, as occurs if supersymmetry is broken in a parallel universe living in extra dimensions. This scenario is extremely predictive: soft supersymmetry breaking couplings are completely determined by anomalous dimensions in the effective theory at the weak scale. Gaugino and scalar masses are naturally of the same order, and flavor-changing neutral currents are automatically suppressed. The most glaring problem with this scenario is that slepton masses are negative in the minimal supersymmetric standard model. We point out that this problem can be simply solved by coupling extra Higgs doublets to the leptons. Lepton flavor-changing neutral currents can be naturally avoided by approximate symmetries. We also describe more speculative solutions involving compositeness near the weak scale. We then turn to electroweak symmetry breaking. Adding an explicit \mu term gives a value for B\mu that is too large by a factor of order 100. We construct a realistic model in which the \mu term arises from the vacuum expectation value of a singlet field, so all weak-scale masses are directly related to m_{3/2}. We show that fully realistic electroweak symmetry breaking can occur in this model with moderate fine-tuning. |
hep-ph/9607451 | Apostolos Pilaftsis | Apostolos Pilaftsis | Generalized Pinch Technique and the Background Field Method in General
Gauges | 29 pages, a reference and clarifying comments added. Version to
appear in Nucl. Phys. B | Nucl.Phys. B487 (1997) 467-491 | 10.1016/S0550-3213(96)00686-4 | RAL-TR-96-055 | hep-ph hep-th | null | It is shown that Cornwall's pinch technique can be extended in a consistent
diagrammatic way, so as to describe general background field gauges in
Yang-Mills theories. The resulting one-loop Green's functions are found to obey
Ward identities identical to those derived from the classical action at the
tree level. This generalization of the pinch technique may hence be related to
the background field method implemented with novel gauge-fixing conditions
invariant under background field gauge transformations. To one loop, the
connection between the generalized pinch technique and the background field
method in covariant and in non-covariant gauges is explicitly demonstrated.
| [
{
"created": "Sat, 27 Jul 1996 20:56:55 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Dec 1996 18:25:28 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Pilaftsis",
"Apostolos",
""
]
] | It is shown that Cornwall's pinch technique can be extended in a consistent diagrammatic way, so as to describe general background field gauges in Yang-Mills theories. The resulting one-loop Green's functions are found to obey Ward identities identical to those derived from the classical action at the tree level. This generalization of the pinch technique may hence be related to the background field method implemented with novel gauge-fixing conditions invariant under background field gauge transformations. To one loop, the connection between the generalized pinch technique and the background field method in covariant and in non-covariant gauges is explicitly demonstrated. |
2106.14791 | Gabriella Piccinelli | Gabriella Piccinelli and Angel S\'anchez | Toward a magnetic warm inflation scenario | 15 pages, 5 figures. This version is very close to the published one,
where several improvements were made. Some sections were reorganized and one
was added; 3 figures were added. The abstract, introduction and conclusions
were consequently slightly modified | Phys. Rev. D 106, 043511 (2022) | 10.1103/PhysRevD.106.043511 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by-nc-sa/4.0/ | In this work we explore the effects that a possible primordial magnetic field
can have on the inflaton effective potential, taking as the underlying model a
warm inflation scenario, based on global supersymmetry with a
new-inflation-type potential. The decay scheme for the inflaton field is a
two-step process of radiation production, where the inflaton couples to heavy
intermediate superfields, which in turn interact with light particles. In this
context, we consider that both sectors, heavy and light, are charged and work
in the strong magnetic field approximation for the light fields. We find an
analytical expression for the one-loop effective potential, for an arbitrary
magnetic field strength, and show that the trend of the magnetic contribution
is to make the potential flatter in the origin's vicinity, preserving the
conditions for a successful inflationary process. This result is backed up by
the behavior of slow-roll parameter $\epsilon$. The viability of this magnetic
warm inflation scenario is also supported by the estimation of the effect of
the magnetic field on the heavy particles decay width.
| [
{
"created": "Mon, 28 Jun 2021 15:13:42 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Aug 2022 19:09:57 GMT",
"version": "v2"
}
] | 2022-08-11 | [
[
"Piccinelli",
"Gabriella",
""
],
[
"Sánchez",
"Angel",
""
]
] | In this work we explore the effects that a possible primordial magnetic field can have on the inflaton effective potential, taking as the underlying model a warm inflation scenario, based on global supersymmetry with a new-inflation-type potential. The decay scheme for the inflaton field is a two-step process of radiation production, where the inflaton couples to heavy intermediate superfields, which in turn interact with light particles. In this context, we consider that both sectors, heavy and light, are charged and work in the strong magnetic field approximation for the light fields. We find an analytical expression for the one-loop effective potential, for an arbitrary magnetic field strength, and show that the trend of the magnetic contribution is to make the potential flatter in the origin's vicinity, preserving the conditions for a successful inflationary process. This result is backed up by the behavior of slow-roll parameter $\epsilon$. The viability of this magnetic warm inflation scenario is also supported by the estimation of the effect of the magnetic field on the heavy particles decay width. |
2205.02576 | Yu. A. Simonov | A.M.Badalian and Yu.A.Simonov | The two-channel exotic charmonium-like resonances in the mass region
$(3900-4700)$ MeV | 19 pages | null | 10.1140/epjc/s10052-022-11006-4 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The resonances, containing $c\bar c$ plus $s\bar s$ (or light $q\bar q$)
quarks in the mass region $(3900-4700)$ MeV, are analyzed in the relativistic
strong coupling theory, with and without channel coupling phenomena. The
conventional charmonium spectrum is presented, being calculated with the
relativistic string Hamiltonian, which does not contain fitting parameters,
while for high excitations the universal flattened confining potential is used.
It is shown that $X(4274),X(4500),X(4700)$ can be identified as $3\,^3P_1,
4\,^3P_0, 5\,^3P_0$ states. The exotic states are considered using the
coupled-channel (recoupling) theory, when two mesons $m_1,m_2$ transfer into
another two mesons $m_3, m_4$ and back (infinite number of times), creating the
four-quark systems. The resonances $X(3875), X(3915), Z_{cs}(3985), X(4140)$
can be explained in this way as the exotic four-quark states in the $S$-wave
decay channels.
| [
{
"created": "Thu, 5 May 2022 11:18:19 GMT",
"version": "v1"
},
{
"created": "Mon, 9 May 2022 09:23:08 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Jul 2022 08:58:11 GMT",
"version": "v3"
},
{
"created": "Mon, 10 Oct 2022 16:32:36 GMT",
"version": "v4"
},
{
"created": "Tue, 11 Oct 2022 20:09:22 GMT",
"version": "v5"
},
{
"created": "Tue, 1 Nov 2022 09:01:51 GMT",
"version": "v6"
}
] | 2022-11-30 | [
[
"Badalian",
"A. M.",
""
],
[
"Simonov",
"Yu. A.",
""
]
] | The resonances, containing $c\bar c$ plus $s\bar s$ (or light $q\bar q$) quarks in the mass region $(3900-4700)$ MeV, are analyzed in the relativistic strong coupling theory, with and without channel coupling phenomena. The conventional charmonium spectrum is presented, being calculated with the relativistic string Hamiltonian, which does not contain fitting parameters, while for high excitations the universal flattened confining potential is used. It is shown that $X(4274),X(4500),X(4700)$ can be identified as $3\,^3P_1, 4\,^3P_0, 5\,^3P_0$ states. The exotic states are considered using the coupled-channel (recoupling) theory, when two mesons $m_1,m_2$ transfer into another two mesons $m_3, m_4$ and back (infinite number of times), creating the four-quark systems. The resonances $X(3875), X(3915), Z_{cs}(3985), X(4140)$ can be explained in this way as the exotic four-quark states in the $S$-wave decay channels. |
1302.6995 | Christopher W. Murphy | Benjam\'in Grinstein, Christopher W. Murphy | Bottom-Quark Forward-Backward Asymmetry in the Standard Model and Beyond | v3: Bug found in FeynRules 1.6.1 (not present in current version,
2.0.24) One plot corrected. Conclusions unaffected | null | 10.1103/PhysRevLett.111.062003 | UCSD/PTH 13-01 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We computed the bottom-quark forward-backward asymmetry at the Tevatron in
the Standard Model and for several new physics scenarios. Near the $Z$-pole,
the SM bottom asymmetry is dominated by tree level exchanges of electroweak
gauge bosons. While above the $Z$-pole, next-to-leading order QCD dominates the
SM asymmetry as was the case with the top quark forward-backward asymmetry.
Light new physics, $M_{NP} \precsim 150$ GeV, can cause significant deviations
from the SM prediction for the bottom asymmetry. The bottom asymmetry can be
used to distinguish between competing NP explanations of the top asymmetry
based on how the NP interferes with s-channel gluon and $Z$ exchange.
| [
{
"created": "Wed, 27 Feb 2013 21:00:02 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Aug 2013 01:14:06 GMT",
"version": "v2"
},
{
"created": "Thu, 10 Jul 2014 20:22:08 GMT",
"version": "v3"
}
] | 2014-07-14 | [
[
"Grinstein",
"Benjamín",
""
],
[
"Murphy",
"Christopher W.",
""
]
] | We computed the bottom-quark forward-backward asymmetry at the Tevatron in the Standard Model and for several new physics scenarios. Near the $Z$-pole, the SM bottom asymmetry is dominated by tree level exchanges of electroweak gauge bosons. While above the $Z$-pole, next-to-leading order QCD dominates the SM asymmetry as was the case with the top quark forward-backward asymmetry. Light new physics, $M_{NP} \precsim 150$ GeV, can cause significant deviations from the SM prediction for the bottom asymmetry. The bottom asymmetry can be used to distinguish between competing NP explanations of the top asymmetry based on how the NP interferes with s-channel gluon and $Z$ exchange. |
0709.4408 | Georg Weiglein | Georg Weiglein | SUSY Higgs bosons at the LHC | 4 pages, contribution to the proceedings of the 42nd Rencontres de
Moriond, QCD session, La Thuile, March 17-24, 2007 | null | null | IPPP/07/57, DCPT/07/114 | hep-ph | null | Recent results on MSSM Higgs physics at the LHC are reviewed. The dependence
of the LHC discovery reach in the b\bar b H/A, H/A \to \tau^+\tau^- channel on
the underlying SUSY scenario is analysed. This is done by combining the latest
results for the prospective CMS experimental sensitivities for an integrated
luminosity of 30 or 60 fb^-1 with state-of-the-art theoretical predictions of
MSSM Higgs-boson properties. The results are interpreted in terms of the
parameters governing the MSSM Higgs sector at lowest order, M_A and tan_beta.
While the higgsino mass parameter \mu has a significant impact on the
prospective discovery reach (and correspondingly the ``LHC wedge'' region), it
is found that the discovery reach is rather stable with respect to variations
of other supersymmetric parameters. Within the discovery region a determination
of the masses of the heavy neutral Higgs bosons with an accuracy of 1-4% seems
feasible. It is furthermore shown that Higgs-boson production in central
exclusive diffractive channels can provide important information on the
properties of the neutral MSSM Higgs bosons.
| [
{
"created": "Thu, 27 Sep 2007 14:34:55 GMT",
"version": "v1"
}
] | 2007-09-28 | [
[
"Weiglein",
"Georg",
""
]
] | Recent results on MSSM Higgs physics at the LHC are reviewed. The dependence of the LHC discovery reach in the b\bar b H/A, H/A \to \tau^+\tau^- channel on the underlying SUSY scenario is analysed. This is done by combining the latest results for the prospective CMS experimental sensitivities for an integrated luminosity of 30 or 60 fb^-1 with state-of-the-art theoretical predictions of MSSM Higgs-boson properties. The results are interpreted in terms of the parameters governing the MSSM Higgs sector at lowest order, M_A and tan_beta. While the higgsino mass parameter \mu has a significant impact on the prospective discovery reach (and correspondingly the ``LHC wedge'' region), it is found that the discovery reach is rather stable with respect to variations of other supersymmetric parameters. Within the discovery region a determination of the masses of the heavy neutral Higgs bosons with an accuracy of 1-4% seems feasible. It is furthermore shown that Higgs-boson production in central exclusive diffractive channels can provide important information on the properties of the neutral MSSM Higgs bosons. |
hep-ph/9610338 | Iain Stewart | Iain W. Stewart (1 and 2), and Peter G. Blunden (1 and 3) ((1) Univ.
of Manitoba, (2) Cal Tech, (3) Univ. of Washington) | Quantum solitons at strong coupling | 17 pages, 4 Postscript figures, REVTeX | Phys.Rev.D55:3742-3747,1997 | 10.1103/PhysRevD.55.3742 | CALT-68-2080 | hep-ph hep-th | null | We examine the effect of one loop quantum corrections on the formation of
nontopological solitons in a strongly coupled scalar-fermionic Yukawa theory.
The exact one fermion loop contribution is incorporated by using a nonlocal
method to correct the local derivative expansion approximation (DE) of the
effective action. As the Yukawa coupling is increased we find that the nonlocal
corrections play an increasingly important role. The corrections cause the
scalar field to increase in depth while maintaining its size. This increases
the energy of the bag configuration, but this is compensated for by more
tightly bound fermionic states with lower energy. In contrast to the
semi-classical picture without quantum corrections, the binding energy is
small, and the total energy scales directly with the Yukawa coupling. This
confirms the qualitative behavior found in earlier work using the second order
DE, although the quantitative solutions differ.
| [
{
"created": "Sat, 12 Oct 1996 01:36:37 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Stewart",
"Iain W.",
"",
"1 and 2"
],
[
"Blunden",
"Peter G.",
"",
"1 and 3"
]
] | We examine the effect of one loop quantum corrections on the formation of nontopological solitons in a strongly coupled scalar-fermionic Yukawa theory. The exact one fermion loop contribution is incorporated by using a nonlocal method to correct the local derivative expansion approximation (DE) of the effective action. As the Yukawa coupling is increased we find that the nonlocal corrections play an increasingly important role. The corrections cause the scalar field to increase in depth while maintaining its size. This increases the energy of the bag configuration, but this is compensated for by more tightly bound fermionic states with lower energy. In contrast to the semi-classical picture without quantum corrections, the binding energy is small, and the total energy scales directly with the Yukawa coupling. This confirms the qualitative behavior found in earlier work using the second order DE, although the quantitative solutions differ. |
hep-ph/9304233 | Silas Beane | Silas R. Beane and Samir Varma | Strongly Interacting W's and Z's and the Existence of a Heavy Fourth
Generation of Fermions | 8 pages including 4 uuencoded, tarred, and compressed postscript
figures, CPP-93-09 | Phys.Lett. B313 (1993) 165-170 | 10.1016/0370-2693(93)91207-4 | null | hep-ph | null | By employing the dictum that axiomatic principles are devoid of predictive
power, we find that the elastic unitarity constraint, applied to strong
W$_L$W$_L$ scattering, does not alter the assumed spectrum of intermediate
states. We consider intermediate states involving a heavy Higgs and heavy
fermions of a hypothetical fourth generation doublet. In contrast to recent
studies, we find no p-wave resonance, and therefore no violation of the S
parameter upper bound. We conclude that the elastic unitarity constraint sheds
no light on the existence of a heavy fourth generation.
| [
{
"created": "Thu, 8 Apr 1993 14:14:24 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Beane",
"Silas R.",
""
],
[
"Varma",
"Samir",
""
]
] | By employing the dictum that axiomatic principles are devoid of predictive power, we find that the elastic unitarity constraint, applied to strong W$_L$W$_L$ scattering, does not alter the assumed spectrum of intermediate states. We consider intermediate states involving a heavy Higgs and heavy fermions of a hypothetical fourth generation doublet. In contrast to recent studies, we find no p-wave resonance, and therefore no violation of the S parameter upper bound. We conclude that the elastic unitarity constraint sheds no light on the existence of a heavy fourth generation. |
0905.2506 | Christian Kellermann | Christian Kellermann, Christian S. Fischer | The four-gluon vertex and the running coupling in Landau gauge
Yang-Mills theory | 6 pages, 1 figure. Talk given at ExcitedQCD 2009, Feb. 8-14,
Zakopane, Poland | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We summarise results for the running coupling from the four-gluon vertex in
Landau gauge, SU($N_c$) Yang-Mills theory as given by a combination of dressing
functions of the vertex and the gluon propagator. These functions have been
determined numerically from the corresponding set of Dyson-Schwinger equations.
In the infrared we obtain a nontrivial infrared fixed point which is three
orders of magnitude smaller than the corresponding one in the coupling of the
ghost-gluon vertex.
| [
{
"created": "Fri, 15 May 2009 10:01:42 GMT",
"version": "v1"
}
] | 2009-05-18 | [
[
"Kellermann",
"Christian",
""
],
[
"Fischer",
"Christian S.",
""
]
] | We summarise results for the running coupling from the four-gluon vertex in Landau gauge, SU($N_c$) Yang-Mills theory as given by a combination of dressing functions of the vertex and the gluon propagator. These functions have been determined numerically from the corresponding set of Dyson-Schwinger equations. In the infrared we obtain a nontrivial infrared fixed point which is three orders of magnitude smaller than the corresponding one in the coupling of the ghost-gluon vertex. |
1201.3696 | Nobuhiro Maekawa | Yasuhiro Kurata and Nobuhiro Maekawa | Averaged Number of the Lightest Supersymmetric Particles in Decay of
Superheavy Particle with Long Lifetime | 9 pages | Prog. Theor. Phys. 127 (2012), 657-664 | 10.1143/PTP.127.657 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the averaged number \nu of the lightest supersymmetric particles
(LSPs) in a shower from the decay of superheavy particle X by generalized DGLAP
equations. If the primary decayed particles have color charges and the
virtuality is around 10^13-10^14 GeV, the averaged number of the LSPs can
become O(100). As the result, the upper limit of the mass of the superheavy
particle, whose decay can produce the observed abundance of the dark matter,
can increase from 10^12 GeV to 10^14 GeV. Since the typical scale of the
inflaton mass of the chaotic inflation is around 10^13 GeV, the decay of the
inflaton can produce the observed dark matter abundance if the reheating
temperature is of order 1 GeV. Even for the standard model particles with
virtuality Q\sim 10-100 TeV, the averaged number of the LSPs becomes O(0.1) for
gluon, and O(0.01) for Higgs, which strongly constrains the scenario of
non-thermal LSP production from the decay of moduli with 10-100 TeV mass.
| [
{
"created": "Wed, 18 Jan 2012 05:53:28 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jan 2012 06:02:52 GMT",
"version": "v2"
}
] | 2012-05-03 | [
[
"Kurata",
"Yasuhiro",
""
],
[
"Maekawa",
"Nobuhiro",
""
]
] | We calculate the averaged number \nu of the lightest supersymmetric particles (LSPs) in a shower from the decay of superheavy particle X by generalized DGLAP equations. If the primary decayed particles have color charges and the virtuality is around 10^13-10^14 GeV, the averaged number of the LSPs can become O(100). As the result, the upper limit of the mass of the superheavy particle, whose decay can produce the observed abundance of the dark matter, can increase from 10^12 GeV to 10^14 GeV. Since the typical scale of the inflaton mass of the chaotic inflation is around 10^13 GeV, the decay of the inflaton can produce the observed dark matter abundance if the reheating temperature is of order 1 GeV. Even for the standard model particles with virtuality Q\sim 10-100 TeV, the averaged number of the LSPs becomes O(0.1) for gluon, and O(0.01) for Higgs, which strongly constrains the scenario of non-thermal LSP production from the decay of moduli with 10-100 TeV mass. |
hep-ph/9712415 | Aharon Levy | Halina Abramowicz and Aharon Levy | The ALLM parameterization of sigma_{tot}(gamma* p) - an update | A misprint in the parameter table (table 2) was corrected | null | null | DESY 97-251 | hep-ph hep-ex | null | The ALLM parameterization of sigma_{tot}(gamma* p) has been updated by using
all published F_2 data to determine its parameters. The fit yields a chi^2/ndf
of 0.97 for the 1356 data points. The updated ALLM parameterization, ALLM97,
gives a good description of all the available data in the whole x and Q^2 range
studied so far (3\times10^{-6} < x < 0.85, 0 \le Q^2 < 5000 GeV^2).
| [
{
"created": "Wed, 17 Dec 1997 12:55:20 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Aug 2004 17:27:52 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Abramowicz",
"Halina",
""
],
[
"Levy",
"Aharon",
""
]
] | The ALLM parameterization of sigma_{tot}(gamma* p) has been updated by using all published F_2 data to determine its parameters. The fit yields a chi^2/ndf of 0.97 for the 1356 data points. The updated ALLM parameterization, ALLM97, gives a good description of all the available data in the whole x and Q^2 range studied so far (3\times10^{-6} < x < 0.85, 0 \le Q^2 < 5000 GeV^2). |
0905.4594 | Axel Maas | Reinhard Alkofer, Axel Maas, Daniel Zwanziger | Truncating first-order Dyson-Schwinger equations in Coulomb-Gauge
Yang-Mills theory | 22 pages, 4 figures, 1 table | Few Body Syst.47:73-90,2010 | 10.1007/s00601-009-0073-0 | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The non-perturbative domain of QCD contains confinement, chiral symmetry
breaking, and the bound state spectrum. For the calculation of the latter, the
Coulomb gauge is particularly well-suited. Access to these non-perturbative
properties should be possible by means of the Green's functions. However,
Coulomb gauge is also very involved, and thus hard to tackle. We introduce a
novel BRST-type operator r, and show that the left-hand side of Gauss' law is
r-exact.
We investigate a possible truncation scheme of the Dyson-Schwinger equations
in first-order formalism for the propagators based on an instantaneous
approximation. We demonstrate that this is insufficient to obtain solutions
with the expected property of a linear-rising Coulomb potential. We also show
systematically that a class of possible vertex dressings does not change this
result.
| [
{
"created": "Thu, 28 May 2009 09:53:54 GMT",
"version": "v1"
}
] | 2010-01-15 | [
[
"Alkofer",
"Reinhard",
""
],
[
"Maas",
"Axel",
""
],
[
"Zwanziger",
"Daniel",
""
]
] | The non-perturbative domain of QCD contains confinement, chiral symmetry breaking, and the bound state spectrum. For the calculation of the latter, the Coulomb gauge is particularly well-suited. Access to these non-perturbative properties should be possible by means of the Green's functions. However, Coulomb gauge is also very involved, and thus hard to tackle. We introduce a novel BRST-type operator r, and show that the left-hand side of Gauss' law is r-exact. We investigate a possible truncation scheme of the Dyson-Schwinger equations in first-order formalism for the propagators based on an instantaneous approximation. We demonstrate that this is insufficient to obtain solutions with the expected property of a linear-rising Coulomb potential. We also show systematically that a class of possible vertex dressings does not change this result. |
hep-ph/9706346 | Masaharu Tanabashi | Iwana Inukai, Masaharu Tanabashi and Koichi Yamawaki | Top Quark Condensate in Grand Unified Theories | 10pages, to appear in Proc. of 1996 International Workshop on
Perspectives of Strong Coupling Gauge Theories (SCGT 96), Nagoya, Japan | null | null | TU/97/521 | hep-ph | null | We propose a top quark condensate scenario embedded in grand unified theories
(GUTs), stressing that the gauged Nambu-Jona-Lasinio model has a nontrivial
continuum limit (``renormalizability'') under certain condition which is
actually satisfied in all sensible GUTs with simple group. The top quark mass
prediction in this scenario is shown to be insensitive to the ultraviolet
cutoff $\Lambda$ thanks to the ``renormalizability''. We also discuss a
possibility to reduce the top mass prediction in this scenario.
| [
{
"created": "Fri, 13 Jun 1997 01:04:40 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Jun 1997 11:06:35 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Inukai",
"Iwana",
""
],
[
"Tanabashi",
"Masaharu",
""
],
[
"Yamawaki",
"Koichi",
""
]
] | We propose a top quark condensate scenario embedded in grand unified theories (GUTs), stressing that the gauged Nambu-Jona-Lasinio model has a nontrivial continuum limit (``renormalizability'') under certain condition which is actually satisfied in all sensible GUTs with simple group. The top quark mass prediction in this scenario is shown to be insensitive to the ultraviolet cutoff $\Lambda$ thanks to the ``renormalizability''. We also discuss a possibility to reduce the top mass prediction in this scenario. |
1411.0386 | Roman Nevzorov | R. Nevzorov, S. Pakvasa | Nonstandard Higgs decays in the E6 inspired SUSY models | Parallel talk at ICHEP 2014, Valencia, Spain, July 2014, 6 pages,
based on arXiv:1308.1021 | null | null | ADP-14-32-T891 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the exotic decays of the SM-like Higgs state within the E6
inspired supersymmetric (SUSY) models. In these models the lightest SUSY
particle (LSP) can be substantially lighter than 1 eV forming hot dark matter
in the Universe. The next--to--lightest SUSY particle (NLSP) also tend to be
light. We argue that the NLSP with GeV scale mass may lead to the substantial
branching ratio of the nonstandard decays of the SM-like Higgs boson into
NLSPs.
| [
{
"created": "Mon, 3 Nov 2014 07:51:21 GMT",
"version": "v1"
}
] | 2014-11-04 | [
[
"Nevzorov",
"R.",
""
],
[
"Pakvasa",
"S.",
""
]
] | We consider the exotic decays of the SM-like Higgs state within the E6 inspired supersymmetric (SUSY) models. In these models the lightest SUSY particle (LSP) can be substantially lighter than 1 eV forming hot dark matter in the Universe. The next--to--lightest SUSY particle (NLSP) also tend to be light. We argue that the NLSP with GeV scale mass may lead to the substantial branching ratio of the nonstandard decays of the SM-like Higgs boson into NLSPs. |
2211.05139 | Xucheng Gan | Asher Berlin, Jeff A. Dror, Xucheng Gan, Joshua T. Ruderman | Millicharged Relics Reveal Massless Dark Photons | 16 pages, 3 appendices, 6 figures; v2, minor improvements to the
text, references added, results and conclusions unchanged | JHEP 05 (2023) 046 | 10.1007/JHEP05(2023)046 | FERMILAB-PUB-21-724-SQMS-T | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | The detection of massless kinetically-mixed dark photons is notoriously
difficult, as the effect of this mixing can be removed by a field redefinition
in vacuum. In this work, we study the prospect of detecting massless dark
photons in the presence of a cosmic relic directly charged under this dark
electromagnetism. Such millicharged particles, in the form of dark matter or
dark radiation, generate an effective dark photon mass that drives
photon-to-dark photon oscillations in the early universe. We also study the
prospect for such models to alleviate existing cosmological constraints on
massive dark photons, enlarging the motivation for direct tests of this
parameter space using precision terrestrial probes.
| [
{
"created": "Wed, 9 Nov 2022 19:00:01 GMT",
"version": "v1"
},
{
"created": "Sun, 7 May 2023 04:07:48 GMT",
"version": "v2"
}
] | 2023-05-09 | [
[
"Berlin",
"Asher",
""
],
[
"Dror",
"Jeff A.",
""
],
[
"Gan",
"Xucheng",
""
],
[
"Ruderman",
"Joshua T.",
""
]
] | The detection of massless kinetically-mixed dark photons is notoriously difficult, as the effect of this mixing can be removed by a field redefinition in vacuum. In this work, we study the prospect of detecting massless dark photons in the presence of a cosmic relic directly charged under this dark electromagnetism. Such millicharged particles, in the form of dark matter or dark radiation, generate an effective dark photon mass that drives photon-to-dark photon oscillations in the early universe. We also study the prospect for such models to alleviate existing cosmological constraints on massive dark photons, enlarging the motivation for direct tests of this parameter space using precision terrestrial probes. |
1512.06647 | Takayasu Sekihara | Wen-Chen Chang (Taiwan, Inst. Phys.), S. Kumano (KEK, Tsukuba and
J-PARC, Tokai), Takayasu Sekihara (RCNP, Osaka U.) | Constituent-counting rule in photoproduction of hyperon resonances | 7 pages, 9 eps figures, version accepted for publication in PRD,
discussions improved | null | 10.1103/PhysRevD.93.034006 | KEK-TH-1881, J-PARC-TH-0047 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the CLAS data on the photoproduction of hyperon resonances, as
well as the available data for the ground state $\Lambda$ and $\Sigma ^{0}$ of
the CLAS and SLAC-E84 collaborations, by considering constituent-counting rule
suggested by perturbative QCD. The counting rule emerges as a scaling behavior
of cross sections in hard exclusive reactions with large scattering angles, and
it enables us to determine the number of elementary constituents inside
hadrons. Therefore, it could be used as a new method for identifying internal
constituents of exotic-hadron candidates. From the analyses of the $\gamma \, p
\to K^{+} \Lambda$ and $K^{+} \Sigma ^{0}$ reactions, we find that the number
of the elementary constituents is consistent with $n_{\gamma} = 1$, $n_{p} =
3$, $n_{K^{+}} = 2$, and $n_{\Lambda} = n_{\Sigma ^{0}} = 3$. Then, the
analysis is made for the photoproductions of the hyperon resonances $\Lambda
(1405)$, $\Sigma (1385)^{0}$, and $\Lambda (1520)$, where $\Lambda (1405)$ is
considered to be a $\bar K N$ molecule and hence its constituent number could
be five. However, we find that the current data are not enough to conclude the
numbers of their constituent. It is necessary to investigate the higher-energy
region at $\sqrt{s} > 2.8$ GeV experimentally beyond the energy of the
available CLAS data for counting the number of constituents clearly. We also
mention that our results indicate energy dependence in the constituent number,
especially for $\Lambda (1405)$. If an excited hyperon is a mixture of
three-quark and five-quark states, the energy dependence of the scaling
behavior could be valuable for finding its composition and mixture.
| [
{
"created": "Mon, 21 Dec 2015 14:36:43 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Dec 2015 13:52:08 GMT",
"version": "v2"
},
{
"created": "Fri, 8 Jan 2016 00:37:52 GMT",
"version": "v3"
}
] | 2016-03-23 | [
[
"Chang",
"Wen-Chen",
"",
"Taiwan, Inst. Phys."
],
[
"Kumano",
"S.",
"",
"KEK, Tsukuba and\n J-PARC, Tokai"
],
[
"Sekihara",
"Takayasu",
"",
"RCNP, Osaka U."
]
] | We analyze the CLAS data on the photoproduction of hyperon resonances, as well as the available data for the ground state $\Lambda$ and $\Sigma ^{0}$ of the CLAS and SLAC-E84 collaborations, by considering constituent-counting rule suggested by perturbative QCD. The counting rule emerges as a scaling behavior of cross sections in hard exclusive reactions with large scattering angles, and it enables us to determine the number of elementary constituents inside hadrons. Therefore, it could be used as a new method for identifying internal constituents of exotic-hadron candidates. From the analyses of the $\gamma \, p \to K^{+} \Lambda$ and $K^{+} \Sigma ^{0}$ reactions, we find that the number of the elementary constituents is consistent with $n_{\gamma} = 1$, $n_{p} = 3$, $n_{K^{+}} = 2$, and $n_{\Lambda} = n_{\Sigma ^{0}} = 3$. Then, the analysis is made for the photoproductions of the hyperon resonances $\Lambda (1405)$, $\Sigma (1385)^{0}$, and $\Lambda (1520)$, where $\Lambda (1405)$ is considered to be a $\bar K N$ molecule and hence its constituent number could be five. However, we find that the current data are not enough to conclude the numbers of their constituent. It is necessary to investigate the higher-energy region at $\sqrt{s} > 2.8$ GeV experimentally beyond the energy of the available CLAS data for counting the number of constituents clearly. We also mention that our results indicate energy dependence in the constituent number, especially for $\Lambda (1405)$. If an excited hyperon is a mixture of three-quark and five-quark states, the energy dependence of the scaling behavior could be valuable for finding its composition and mixture. |
2405.20280 | Xiaojun Yao | Di-Lun Yang and Xiaojun Yao | Quarkonium Polarization in Medium from Open Quantum Systems and
Chromomagnetic Correlators | 37 pages | null | null | IQuS@UW-21-079 | hep-ph nucl-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the spin-dependent in-medium dynamics of quarkonia by using the
potential nonrelativistic QCD (pNRQCD) and the open quantum system framework.
We consider the pNRQCD Lagrangian valid up to the order $\frac{r}{M^0}=r$ and
$\frac{r^0}{M}=\frac{1}{M}$ in the double power counting. By considering the
Markovian condition and applying the Wigner transformation upon the diagonal
spin components of the quarkonium density matrix with the semiclassical
expansion, we systematically derive the Boltzmann transport equation for
quarkonia with polarization dependence in the quantum optical limit. Unlike the
spin-independent collision terms governed by certain chromoelectric field
correlators, new gauge invariant correlators of chromomagnetic fields determine
the recombination and dissociation terms with polarization dependence at the
order we are working. We also derive a Lindblad equation describing the
in-medium transitions between spin-singlet and spin-triplet heavy
quark-antiquark pairs in the quantum Brownian motion limit. The Lindblad
equation is governed by new transport coefficients defined in terms of the
chromomagnetic field correlators. Our formalism is generic and valid for both
weakly-coupled and strongly-coupled quark gluon plasmas. It can be further
applied to study spin alignment of vector quarkonia in heavy ion collisions.
| [
{
"created": "Thu, 30 May 2024 17:33:38 GMT",
"version": "v1"
}
] | 2024-05-31 | [
[
"Yang",
"Di-Lun",
""
],
[
"Yao",
"Xiaojun",
""
]
] | We study the spin-dependent in-medium dynamics of quarkonia by using the potential nonrelativistic QCD (pNRQCD) and the open quantum system framework. We consider the pNRQCD Lagrangian valid up to the order $\frac{r}{M^0}=r$ and $\frac{r^0}{M}=\frac{1}{M}$ in the double power counting. By considering the Markovian condition and applying the Wigner transformation upon the diagonal spin components of the quarkonium density matrix with the semiclassical expansion, we systematically derive the Boltzmann transport equation for quarkonia with polarization dependence in the quantum optical limit. Unlike the spin-independent collision terms governed by certain chromoelectric field correlators, new gauge invariant correlators of chromomagnetic fields determine the recombination and dissociation terms with polarization dependence at the order we are working. We also derive a Lindblad equation describing the in-medium transitions between spin-singlet and spin-triplet heavy quark-antiquark pairs in the quantum Brownian motion limit. The Lindblad equation is governed by new transport coefficients defined in terms of the chromomagnetic field correlators. Our formalism is generic and valid for both weakly-coupled and strongly-coupled quark gluon plasmas. It can be further applied to study spin alignment of vector quarkonia in heavy ion collisions. |
2008.12163 | HongWei Ke | Hong-Wei Ke and Xue-Qian Li | A natural interpretation on the data of $\Lambda_c\to\Sigma\pi$ | 11 pages, 1 figure and 5 tables | Phys. Rev. D 102, 113013 (2020) | 10.1103/PhysRevD.102.113013 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Even though the Standard Model (SM) has achieved great success, its
application to the field of low energies still lacks solid foundation due to
our limited knowledge on non-perturbative QCD. Practically, all theoretical
calculations of the hadronic transition matrix elements are based various
phenomenological models. There indeed exist some anomalies in the field which
are waiting for interpretations. The goal of this work is trying to solve one
of the anomalies: the discrepancy between the theoretical prediction on the
sign of the up-down asymmetry parameter of $\Lambda_c\to\Sigma\pi$ and the
experimental measurement. In the literatures several authors calculated the
rate and determined the asymmetry parameter within various schemes, but there
exist obvious loopholes in those adopted scenarios. To solve the discrepancy
between theory and data, we suggest that not only the direct transition process
contributes to the observed $\Lambda_c\to\Sigma\pi$, but also other portals
such as $\Lambda_c\to \Lambda\rho$ also play a substantial role via an
isospin-conserving re-scattering $\Lambda\rho\to\Sigma\pi$. Taking into account
of the effects induced by the final state interaction, we re-evaluate the
relevant quantities. Our numerical results indicate that the new theoretical
prediction based on this scenario involving an interference between the direct
transition of $\Lambda_c\to\Sigma\pi$ and the portal
$\Lambda_c\to\Lambda\rho\to\Sigma\pi$ can make both the decay rate and sign of
the asymmetry parameter to be consistent with data.
| [
{
"created": "Thu, 27 Aug 2020 14:41:50 GMT",
"version": "v1"
}
] | 2021-01-04 | [
[
"Ke",
"Hong-Wei",
""
],
[
"Li",
"Xue-Qian",
""
]
] | Even though the Standard Model (SM) has achieved great success, its application to the field of low energies still lacks solid foundation due to our limited knowledge on non-perturbative QCD. Practically, all theoretical calculations of the hadronic transition matrix elements are based various phenomenological models. There indeed exist some anomalies in the field which are waiting for interpretations. The goal of this work is trying to solve one of the anomalies: the discrepancy between the theoretical prediction on the sign of the up-down asymmetry parameter of $\Lambda_c\to\Sigma\pi$ and the experimental measurement. In the literatures several authors calculated the rate and determined the asymmetry parameter within various schemes, but there exist obvious loopholes in those adopted scenarios. To solve the discrepancy between theory and data, we suggest that not only the direct transition process contributes to the observed $\Lambda_c\to\Sigma\pi$, but also other portals such as $\Lambda_c\to \Lambda\rho$ also play a substantial role via an isospin-conserving re-scattering $\Lambda\rho\to\Sigma\pi$. Taking into account of the effects induced by the final state interaction, we re-evaluate the relevant quantities. Our numerical results indicate that the new theoretical prediction based on this scenario involving an interference between the direct transition of $\Lambda_c\to\Sigma\pi$ and the portal $\Lambda_c\to\Lambda\rho\to\Sigma\pi$ can make both the decay rate and sign of the asymmetry parameter to be consistent with data. |
1705.06330 | Reza Moazzemi | Mohammadmahdi Ettefaghi, Reza Moazzemi, Mohsen Rousta | Constraining unparticle physics from $CP$ violation in Cabibbo-favored
decays of D mesons | 10 pages, revtex4-1 style, to appear in PRD | Phys. Rev. D 95, 095027 (2017) | 10.1103/PhysRevD.95.095027 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | According to the standard model, the Cabibbo-favored (CF) decays are $CP$
conserve at tree level. Observation of any finite $CP$ asymmetry can be
received as a signal of new physics. In CF charm meson decays, $ D^0
\rightarrow K^- \pi^+ $ and $ D^+ \rightarrow K_s^0 \pi^+ $, the following
experimental values for their $CP$ asymmetry are reported, respectively: ($0.3
\pm 0.7$) % and ($-0.41 \pm 0.09$) %. The value of the later can be attributed
to the mixing of $ K^0 $ and $ \overline{K^0} $, however, its contribution is
about ($-0.332 \pm 0.006 $) %. In this paper, we use these experimental results
to constrain the unparticle stuff as a new physics which may contribute to
these $CP$ asymmetries.
| [
{
"created": "Wed, 17 May 2017 20:06:02 GMT",
"version": "v1"
}
] | 2018-11-16 | [
[
"Ettefaghi",
"Mohammadmahdi",
""
],
[
"Moazzemi",
"Reza",
""
],
[
"Rousta",
"Mohsen",
""
]
] | According to the standard model, the Cabibbo-favored (CF) decays are $CP$ conserve at tree level. Observation of any finite $CP$ asymmetry can be received as a signal of new physics. In CF charm meson decays, $ D^0 \rightarrow K^- \pi^+ $ and $ D^+ \rightarrow K_s^0 \pi^+ $, the following experimental values for their $CP$ asymmetry are reported, respectively: ($0.3 \pm 0.7$) % and ($-0.41 \pm 0.09$) %. The value of the later can be attributed to the mixing of $ K^0 $ and $ \overline{K^0} $, however, its contribution is about ($-0.332 \pm 0.006 $) %. In this paper, we use these experimental results to constrain the unparticle stuff as a new physics which may contribute to these $CP$ asymmetries. |
1709.08002 | Shi Pu | Yang-guang Yang, Shi Pu | Thermal vorticity production in relativistic dissipative fluids | Presented by S. Pu at Critical Point and Onset of Deconfinement
(CPOD), Wroclaw, Poland, May 30 - June 4, 2016 | null | 10.5506/APhysPolBSupp.10.771 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have computed the circulation integrations of thermal vorticity with and
without charged currents in dissipative fluids. We find that the relativistic
Kelvin circulation theorem will be modified by the dissipative effects,
therefore, the circulation integrations of thermal vorticity may not be
conserved during the fluid evolution.
| [
{
"created": "Sat, 23 Sep 2017 04:31:42 GMT",
"version": "v1"
}
] | 2017-09-26 | [
[
"Yang",
"Yang-guang",
""
],
[
"Pu",
"Shi",
""
]
] | We have computed the circulation integrations of thermal vorticity with and without charged currents in dissipative fluids. We find that the relativistic Kelvin circulation theorem will be modified by the dissipative effects, therefore, the circulation integrations of thermal vorticity may not be conserved during the fluid evolution. |
2210.13141 | Jing-Yu Zhu | Maksym Ovchynnikov, Thomas Schwetz and Jing-Yu Zhu | Dipole portal and neutrinophilic scalars at DUNE revisited: the
importance of the high-energy neutrino tail | 22 pages, 13 figures, consistent with published version | null | 10.1103/PhysRevD.107.055029 | null | hep-ph | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We estimate the sensitivity of the DUNE experiment to new physics particles
interacting with neutrinos, considering the dipole portal to heavy neutral
leptons and a neutrinophilic scalar with lepton-number $2$ as examples. We
demonstrate that neutrinos from the high-energy tail of the DUNE flux, with
energies $E_{\nu}\gtrsim 5-10\text{ GeV}$, may significantly improve the
sensitivity to these models, allowing to search for particles as heavy as
$\simeq 10\text{ GeV}$. We also study the impact of the so-called tau-optimized
neutrino beam configuration, which slightly improves sensitivity to the new
physics models considered here. For both models, we consider new production
channels (such as deep-inelastic scattering) and provide a detailed comparison
of different signatures in the detector.
| [
{
"created": "Mon, 24 Oct 2022 11:52:20 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Mar 2023 13:57:35 GMT",
"version": "v2"
}
] | 2023-04-05 | [
[
"Ovchynnikov",
"Maksym",
""
],
[
"Schwetz",
"Thomas",
""
],
[
"Zhu",
"Jing-Yu",
""
]
] | We estimate the sensitivity of the DUNE experiment to new physics particles interacting with neutrinos, considering the dipole portal to heavy neutral leptons and a neutrinophilic scalar with lepton-number $2$ as examples. We demonstrate that neutrinos from the high-energy tail of the DUNE flux, with energies $E_{\nu}\gtrsim 5-10\text{ GeV}$, may significantly improve the sensitivity to these models, allowing to search for particles as heavy as $\simeq 10\text{ GeV}$. We also study the impact of the so-called tau-optimized neutrino beam configuration, which slightly improves sensitivity to the new physics models considered here. For both models, we consider new production channels (such as deep-inelastic scattering) and provide a detailed comparison of different signatures in the detector. |
1803.08080 | Sophie Renner | Sophie Renner and Pedro Schwaller | A flavoured dark sector | 32 pages, 14 figures. v2: Amended references | null | 10.1007/JHEP08(2018)052 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the phenomenology of a QCD-like dark sector which confines around
the GeV scale. The dark sector inherits a flavour structure from a coupling
between dark quarks and SM quarks via a heavy mediator, which leads to exciting
new phenomena. While stable baryonic bound states are the dark matter
candidates, the phenomenology is dominated by the lightest composite mesons,
the dark pions, which can have decay lengths ranging from millimetres to
hundreds of meters. For masses below 1.5 GeV, their exclusive decays to SM
mesons are calculated for the first time by matching both dark and visible
sectors to a chiral Lagrangian. Constraints from big bang nucleosynthesis, dark
matter direct detection and flavour single out a small region of allowed
parameter space for dark pion masses below 5 GeV. It is best probed by the
fixed target experiments NA62 and SHiP, where dark pions can be produced
copiously in rare decays like B to K piD. Heavier dark pions are best searched
for at the LHC, where they decay after hadronisation to produce jets which
emerge into SM states within the detector. Here the flavour structure ensures
different flavours emerge on different length scales, leading to a striking new
feature in the emerging jets signature.
| [
{
"created": "Wed, 21 Mar 2018 18:37:02 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Apr 2018 00:00:36 GMT",
"version": "v2"
}
] | 2018-08-29 | [
[
"Renner",
"Sophie",
""
],
[
"Schwaller",
"Pedro",
""
]
] | We explore the phenomenology of a QCD-like dark sector which confines around the GeV scale. The dark sector inherits a flavour structure from a coupling between dark quarks and SM quarks via a heavy mediator, which leads to exciting new phenomena. While stable baryonic bound states are the dark matter candidates, the phenomenology is dominated by the lightest composite mesons, the dark pions, which can have decay lengths ranging from millimetres to hundreds of meters. For masses below 1.5 GeV, their exclusive decays to SM mesons are calculated for the first time by matching both dark and visible sectors to a chiral Lagrangian. Constraints from big bang nucleosynthesis, dark matter direct detection and flavour single out a small region of allowed parameter space for dark pion masses below 5 GeV. It is best probed by the fixed target experiments NA62 and SHiP, where dark pions can be produced copiously in rare decays like B to K piD. Heavier dark pions are best searched for at the LHC, where they decay after hadronisation to produce jets which emerge into SM states within the detector. Here the flavour structure ensures different flavours emerge on different length scales, leading to a striking new feature in the emerging jets signature. |
hep-ph/9410327 | null | A. Brandenburg, V. V. Khoze and D. M\"uller | Semi-Exclusive Pion Production in Deep-Inelastic Scattering | 10 pages,PLAIN TEX, 4 figs. appended as compressed and uuencoded PS
file, SLAC-PUB-6688 | Phys.Lett. B347 (1995) 413-418 | 10.1016/0370-2693(95)00064-R | null | hep-ph | null | We calculate azimuthal asymmetries and the Callan-Gross $R$-ratio for
semi-exclusive pion production in deep inelastic scattering taking into account
higher twist effects. Our results are qualitatively different from the
QCD-improved parton model predictions for semi-inclusive deep inelastic
scattering.
| [
{
"created": "Thu, 20 Oct 1994 00:30:00 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Brandenburg",
"A.",
""
],
[
"Khoze",
"V. V.",
""
],
[
"Müller",
"D.",
""
]
] | We calculate azimuthal asymmetries and the Callan-Gross $R$-ratio for semi-exclusive pion production in deep inelastic scattering taking into account higher twist effects. Our results are qualitatively different from the QCD-improved parton model predictions for semi-inclusive deep inelastic scattering. |
1112.6021 | Zhong-Bo Kang | Zhong-Bo Kang, Ivan Vitev, Hongxi Xing | Dihadron momentum imbalance and correlations in d+Au collisions | 12 pages, 6 figures | Phys.Rev. D85 (2012) 054024 | 10.1103/PhysRevD.85.054024 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate in perturbative QCD the transverse momentum imbalance of dijet
and dihadron production in high energy p+A (d+A) collisions. We evaluate the
effect of both initial- and final-state multiple scattering, which determines
the strength of this transverse momentum imbalance. Combining this new result
with the suppression of the cross section in d+Au collisions, which arises from
cold nuclear matter energy loss and coherent power corrections, we are able to
describe the dihadron correlations measured by both PHENIX and STAR
collaborations at RHIC, including mid-mid, mid-forward, and forward-forward
rapidity hadron pairs.
| [
{
"created": "Tue, 27 Dec 2011 21:00:49 GMT",
"version": "v1"
}
] | 2012-03-29 | [
[
"Kang",
"Zhong-Bo",
""
],
[
"Vitev",
"Ivan",
""
],
[
"Xing",
"Hongxi",
""
]
] | We calculate in perturbative QCD the transverse momentum imbalance of dijet and dihadron production in high energy p+A (d+A) collisions. We evaluate the effect of both initial- and final-state multiple scattering, which determines the strength of this transverse momentum imbalance. Combining this new result with the suppression of the cross section in d+Au collisions, which arises from cold nuclear matter energy loss and coherent power corrections, we are able to describe the dihadron correlations measured by both PHENIX and STAR collaborations at RHIC, including mid-mid, mid-forward, and forward-forward rapidity hadron pairs. |
0907.1498 | Andre Sopczak | Andre Sopczak | Cross-sections and branching ratios for charged Higgs searches | 8 pages, contribution to the Workshop on Prospects for Charged Higgs
Discovery at Colliders, 16-19 September 2008, Uppsala, Sweden | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For the preparation of the experimental search for charged Higgs bosons at
the LHC detailed studies have been made to determine the expected charged Higgs
boson production cross-sections and decay branching ratios at sqrts = 14 TeV.
In the mass regime below the t-quark mass the expected production
cross-sections are discussed using PYTHIA and FeynHiggs program packages based
on the decay t to H^+b. For higher masses Next-to-Leading-Order (NLO
calculations have been used, and particular attention has been given to the
intermediate-mass region. The decay branching ratios have been studied with the
program packages FeynHiggs and HDecay. Higher-order corrections (Delta_b
corrections) in the MSSM are consistently taken into account. Two benchmark
scenarios are considered, one of them the `mhmax'.
| [
{
"created": "Thu, 9 Jul 2009 10:57:32 GMT",
"version": "v1"
}
] | 2009-07-10 | [
[
"Sopczak",
"Andre",
""
]
] | For the preparation of the experimental search for charged Higgs bosons at the LHC detailed studies have been made to determine the expected charged Higgs boson production cross-sections and decay branching ratios at sqrts = 14 TeV. In the mass regime below the t-quark mass the expected production cross-sections are discussed using PYTHIA and FeynHiggs program packages based on the decay t to H^+b. For higher masses Next-to-Leading-Order (NLO calculations have been used, and particular attention has been given to the intermediate-mass region. The decay branching ratios have been studied with the program packages FeynHiggs and HDecay. Higher-order corrections (Delta_b corrections) in the MSSM are consistently taken into account. Two benchmark scenarios are considered, one of them the `mhmax'. |
1007.3750 | Carla Biggio | Carla Biggio, Lorenzo Calibbi | Phenomenology of SUSY SU(5) with type I+III seesaw | 12 pages, 6 figures; v2: minor changes, comparison with type I and II
seesaws added, references added, version to appear on JHEP | JHEP 1010:037,2010 | 10.1007/JHEP10(2010)037 | MPP-2010-109 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a supersymmetric SU(5) model where two neutrino masses are
obtained via a mixed type I+III seesaw mechanism induced by the component
fields of a single SU(5) adjoint. We have analyzed the phenomenology of the
model paying particular attention to flavour violating processes and dark
matter relic density, assuming universal boundary conditions. We have found
that, for a seesaw scale larger than $10^{12\div 13}$ GeV, BR$(\mu\to e
\gamma)$ is in the reach of the MEG experiment in sizable regions of the
parameter space. On the other side, current bounds on it force BR$(\tau \to \mu
\gamma)$ to be well below the reach of forthcoming experiments, rendering thus
the model disprovable if a positive signal is found. The same bounds still
allow for a sizable positive contribution to $\epsilon_K$, while the CP
violation in the $B_s$ mixing turns out to be too small to account for the
di-muon anomaly reported by the D0 collaboration. Finally, the regions where
the neutralino relic density is within the WMAP bounds can be strongly modified
with respect to the constrained MSSM case. In particular, a peculiar
coannihilation region, bounded from above, can be realized, which allows us to
put an upper bound on the dark matter mass for certain set-ups of the
parameters.
| [
{
"created": "Wed, 21 Jul 2010 20:18:30 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Sep 2010 12:40:09 GMT",
"version": "v2"
}
] | 2014-11-21 | [
[
"Biggio",
"Carla",
""
],
[
"Calibbi",
"Lorenzo",
""
]
] | We consider a supersymmetric SU(5) model where two neutrino masses are obtained via a mixed type I+III seesaw mechanism induced by the component fields of a single SU(5) adjoint. We have analyzed the phenomenology of the model paying particular attention to flavour violating processes and dark matter relic density, assuming universal boundary conditions. We have found that, for a seesaw scale larger than $10^{12\div 13}$ GeV, BR$(\mu\to e \gamma)$ is in the reach of the MEG experiment in sizable regions of the parameter space. On the other side, current bounds on it force BR$(\tau \to \mu \gamma)$ to be well below the reach of forthcoming experiments, rendering thus the model disprovable if a positive signal is found. The same bounds still allow for a sizable positive contribution to $\epsilon_K$, while the CP violation in the $B_s$ mixing turns out to be too small to account for the di-muon anomaly reported by the D0 collaboration. Finally, the regions where the neutralino relic density is within the WMAP bounds can be strongly modified with respect to the constrained MSSM case. In particular, a peculiar coannihilation region, bounded from above, can be realized, which allows us to put an upper bound on the dark matter mass for certain set-ups of the parameters. |
1103.1688 | Hong-Lei Li | Shou-Shan Bao, Hong-Lei Li, Zong-Guo Si, Yu-Feng Zhou | Probing $W^\prime_L WH$ and $W^\prime_R W H$ Interaction at LHC | null | Phys.Rev.D83:115001,2011 | 10.1103/PhysRevD.83.115001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Many new physics models predict the existence of TeV-scale charged gauge
boson $W^\prime$ together with Higgs boson(s). We study the $W^\prime WH$
interaction and explore the angular distribution of charged lepton to
distinguish $W_R^\prime WH$ from $W_L^\prime WH$ in $pp\to HW\to b \bar b l
\nu$ process at the LHC. It is found that a new type forward-backward
asymmetry($A_{FB}$) relating to the angle between the direction of the charged
lepton in $W$ rest frame and that of the reconstructed $W^\prime$ in laboratory
frame is useful to investigate the properties of $W^\prime W H$ interaction. We
analyze the Standard Model backgrounds and develop a set of cuts to highlight
the signal and suppress the backgrounds at LHC. We find that $A_{FB}$ can reach
0.03(-0.07) for $W_R^\prime$($W_L^\prime$) production at $\sqrt{S}=14$ TeV.
| [
{
"created": "Wed, 9 Mar 2011 01:53:42 GMT",
"version": "v1"
},
{
"created": "Fri, 13 May 2011 03:51:34 GMT",
"version": "v2"
},
{
"created": "Wed, 8 Jun 2011 00:48:44 GMT",
"version": "v3"
}
] | 2011-06-13 | [
[
"Bao",
"Shou-Shan",
""
],
[
"Li",
"Hong-Lei",
""
],
[
"Si",
"Zong-Guo",
""
],
[
"Zhou",
"Yu-Feng",
""
]
] | Many new physics models predict the existence of TeV-scale charged gauge boson $W^\prime$ together with Higgs boson(s). We study the $W^\prime WH$ interaction and explore the angular distribution of charged lepton to distinguish $W_R^\prime WH$ from $W_L^\prime WH$ in $pp\to HW\to b \bar b l \nu$ process at the LHC. It is found that a new type forward-backward asymmetry($A_{FB}$) relating to the angle between the direction of the charged lepton in $W$ rest frame and that of the reconstructed $W^\prime$ in laboratory frame is useful to investigate the properties of $W^\prime W H$ interaction. We analyze the Standard Model backgrounds and develop a set of cuts to highlight the signal and suppress the backgrounds at LHC. We find that $A_{FB}$ can reach 0.03(-0.07) for $W_R^\prime$($W_L^\prime$) production at $\sqrt{S}=14$ TeV. |
2407.14592 | Jes\'us Luque Del Castillo | Jose A. R. Cembranos, Jes\'us Luque and Javier Rubio | Scalar Dark Matter Production through the Bubble Expansion Mechanism:
The Boosting Role of Non-Renormalizable Interactions | 11 pages, 6 figures | null | null | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a Bubble Expansion mechanism for the production of scalar dark
matter during a first-order phase transition in the early Universe. Seeking for
a dark matter energy density in agreement with observations, we study different
non-renormalizable interactions between the dark matter species and the field
undergoing the transition. The resulting relic abundance is shown to display a
strong dependence on the Lorentz boost factor associated to the bubble wall
motion, with this dependence becoming more significant the higher the dimension
of the non-renormalizable interaction. This allows for observational
compatibility across a wide range of dark matter masses and transition
temperatures, typically excluded in renormalizable scenarios. For a transition
around the electroweak scale, the associated gravitational wave spectrum is
also within the reach of future detectors.
| [
{
"created": "Fri, 19 Jul 2024 18:00:01 GMT",
"version": "v1"
}
] | 2024-07-23 | [
[
"Cembranos",
"Jose A. R.",
""
],
[
"Luque",
"Jesús",
""
],
[
"Rubio",
"Javier",
""
]
] | We consider a Bubble Expansion mechanism for the production of scalar dark matter during a first-order phase transition in the early Universe. Seeking for a dark matter energy density in agreement with observations, we study different non-renormalizable interactions between the dark matter species and the field undergoing the transition. The resulting relic abundance is shown to display a strong dependence on the Lorentz boost factor associated to the bubble wall motion, with this dependence becoming more significant the higher the dimension of the non-renormalizable interaction. This allows for observational compatibility across a wide range of dark matter masses and transition temperatures, typically excluded in renormalizable scenarios. For a transition around the electroweak scale, the associated gravitational wave spectrum is also within the reach of future detectors. |
2103.02592 | Rajeev Singh Mr. | Rajeev Singh, Masoud Shokri, and Radoslaw Ryblewski | Spin polarization dynamics in the Bjorken-expanding resistive MHD
background | 12 pages, 6 figures; Accepted version; Comments are very much
welcome! | Phys. Rev. D 103, 094034 (2021) | 10.1103/PhysRevD.103.094034 | null | hep-ph hep-th nucl-th | http://creativecommons.org/licenses/by/4.0/ | Evolution of spin polarization in the presence of external electric field is
studied for collision energies $\sqrt{s_{\rm NN}}=27\,{\rm GeV}$ and
$\sqrt{s_{\rm NN}}=200\,{\rm GeV}$. The numerical analysis is done in the
perfect-fluid Bjorken-expanding resistive magnetohydrodynamic background and
novel results are reported. In particular, we show that the electric field
plays a significant role in the competition between expansion and dissipation.
| [
{
"created": "Sat, 27 Feb 2021 15:05:05 GMT",
"version": "v1"
},
{
"created": "Fri, 21 May 2021 06:45:42 GMT",
"version": "v2"
}
] | 2021-06-02 | [
[
"Singh",
"Rajeev",
""
],
[
"Shokri",
"Masoud",
""
],
[
"Ryblewski",
"Radoslaw",
""
]
] | Evolution of spin polarization in the presence of external electric field is studied for collision energies $\sqrt{s_{\rm NN}}=27\,{\rm GeV}$ and $\sqrt{s_{\rm NN}}=200\,{\rm GeV}$. The numerical analysis is done in the perfect-fluid Bjorken-expanding resistive magnetohydrodynamic background and novel results are reported. In particular, we show that the electric field plays a significant role in the competition between expansion and dissipation. |
1801.05561 | Stephen Lonsdale | Stephen J. Lonsdale and Raymond R. Volkas | Comprehensive asymmetric dark matter model | 45 pages, 11 figures. Matches published version | Phys. Rev. D 97, 103510 (2018) | 10.1103/PhysRevD.97.103510 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Asymmetric dark matter (ADM) is motivated by the similar cosmological mass
densities measured for ordinary and dark matter. We present a comprehensive
theory for ADM that addresses the mass density similarity, going beyond the
usual ADM explanations of similar number densities. It features an explicit
matter-antimatter asymmetry generation mechanism, has one fully worked out
thermal history and suggestions for other possibilities, and meets all
phenomenological, cosmological and astrophysical constraints. Importantly, it
incorporates a deep reason for why the dark matter mass scale is related to the
proton mass, a key consideration in ADM models. Our starting point is the idea
of mirror matter, which offers an explanation for dark matter by duplicating
the standard model with a dark sector related by a $Z_2$ parity symmetry.
However, the dark sector need not manifest as a symmetric copy of the standard
model in the present day. By utilising the mechanism of "asymmetric symmetry
breaking" with two Higgs doublets in each sector, we develop a model of ADM
where the mirror symmetry is spontaneously broken, leading to an electroweak
scale in the dark sector that is significantly larger than that of the visible
sector. The weak sensitivity of the ordinary and dark QCD confinement scales to
their respective electroweak scales leads to the necessary connection between
the dark matter and proton masses. The dark matter is composed of either dark
neutrons or a mixture of dark neutrons and metastable dark hydrogen atoms.
Lepton asymmetries are generated by the $CP$-violating decays of heavy Majorana
neutrinos in both sectors. These are then converted by sphaleron processes to
produce the observed ratio of visible to dark matter in the universe. The
dynamics responsible for the kinetic decoupling of the two sectors emerges as
an important issue that we only partially solve.
| [
{
"created": "Wed, 17 Jan 2018 05:55:02 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Feb 2018 04:20:45 GMT",
"version": "v2"
},
{
"created": "Tue, 22 May 2018 05:33:07 GMT",
"version": "v3"
}
] | 2018-05-23 | [
[
"Lonsdale",
"Stephen J.",
""
],
[
"Volkas",
"Raymond R.",
""
]
] | Asymmetric dark matter (ADM) is motivated by the similar cosmological mass densities measured for ordinary and dark matter. We present a comprehensive theory for ADM that addresses the mass density similarity, going beyond the usual ADM explanations of similar number densities. It features an explicit matter-antimatter asymmetry generation mechanism, has one fully worked out thermal history and suggestions for other possibilities, and meets all phenomenological, cosmological and astrophysical constraints. Importantly, it incorporates a deep reason for why the dark matter mass scale is related to the proton mass, a key consideration in ADM models. Our starting point is the idea of mirror matter, which offers an explanation for dark matter by duplicating the standard model with a dark sector related by a $Z_2$ parity symmetry. However, the dark sector need not manifest as a symmetric copy of the standard model in the present day. By utilising the mechanism of "asymmetric symmetry breaking" with two Higgs doublets in each sector, we develop a model of ADM where the mirror symmetry is spontaneously broken, leading to an electroweak scale in the dark sector that is significantly larger than that of the visible sector. The weak sensitivity of the ordinary and dark QCD confinement scales to their respective electroweak scales leads to the necessary connection between the dark matter and proton masses. The dark matter is composed of either dark neutrons or a mixture of dark neutrons and metastable dark hydrogen atoms. Lepton asymmetries are generated by the $CP$-violating decays of heavy Majorana neutrinos in both sectors. These are then converted by sphaleron processes to produce the observed ratio of visible to dark matter in the universe. The dynamics responsible for the kinetic decoupling of the two sectors emerges as an important issue that we only partially solve. |
hep-ph/9802301 | null | J.Soffer | Polarized Parton Distributions and QCD Spin Tests at RHIC-BNL | Latex file, 12 pages and 6 fig included with psfig.sty.,use appb
style. To appear in the Proceedings of The Cracow Epiphany Conference on Spin
Effects in Particle Physics, Cracow, Poland, January 9-11, 1998 | Acta Phys.Polon. B29 (1998) 1303-1314 | null | CPT-98/P3618 | hep-ph | null | The RHIC facility at BNL will be operating soon, part of the year, as a
polarized proton-proton collider. This will allow the undertaking of a vast
spin physics programme, mainly by the two large detectors PHENIX and STAR. We
review some theoretical aspects of this research programme which will allow,
firstly to improve our present knowledge on polarized quark, gluon and sea
distributions in a nucleon, secondly to perform novel QCD spin tests and
finally, perhaps, to uncover some new physics.
| [
{
"created": "Wed, 11 Feb 1998 15:46:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Soffer",
"J.",
""
]
] | The RHIC facility at BNL will be operating soon, part of the year, as a polarized proton-proton collider. This will allow the undertaking of a vast spin physics programme, mainly by the two large detectors PHENIX and STAR. We review some theoretical aspects of this research programme which will allow, firstly to improve our present knowledge on polarized quark, gluon and sea distributions in a nucleon, secondly to perform novel QCD spin tests and finally, perhaps, to uncover some new physics. |
1703.09226 | Andreas Crivellin | Andreas Crivellin, Dario M\"uller and Toshihiko Ota | Simultaneous Explanation of $R(D^{(*)})$ and $b\to s\mu^+\mu^-$: The
Last Scalar Leptoquarks Standing | 8 pages, 4 figures, version accepted for publication in JHEP | null | 10.1007/JHEP09(2017)040 | PSI-PR-17-04, YACHAY-PUB-17-03-PN, ZU-TH 05/17 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Over the past years, experiments accumulated intriguing hints for new physics
(NP) in flavor observables, namely in the anomalous magnetic moment of the muon
($a_\mu$), in $R(D^{(*)})={\rm Br}(B\to D^{(*)}\tau\nu)/{\rm Br}(B\to
D^{(*)}\ell\nu)$ and in $b\to s\mu^+\mu^-$ transitions, which are all at the
$3-4\,\sigma$ level. In this article we point out that one can explain the
$R(D^{(*)})$ anomaly using two scalar leptoquarks (LQs) with the same mass and
coupling to fermions related via a discrete symmetry: an $SU(2)$ singlet and an
$SU(2)$ triplet, both with hypercharge $Y=-2/3$. In this way, potentially
dangerous contributions to $b\to s\nu\nu$ are avoided and non-CKM suppressed
effects in $R(D^{(*)})$ can be generated. This allows for smaller overall
couplings to fermions weakening the direct LHC bounds. In our model,
$R(D^{(*)})$ is directly correlated to $b\to s\tau^+\tau^-$ transitions where
an enhancement by orders of magnitude compared to the standard model (SM) is
predicted, such that these decay modes are in the reach of LHCb and BELLE II.
Furthermore, one can also naturally explain the $b\to s\mu^+\mu^-$ anomalies
(including $R(K)$) by a $C_9=-C_{10}$ like contribution without spoiling
$\mu-e$ universality in charged current decays. In this case sizable effects in
$b\to s\tau\mu$ transitions are predicted which are again well within the
experimental reach. One can even address the longstanding anomaly in $a_\mu$,
generating a sizable decay rate for $\tau\to\mu\gamma$. However, we find that
out of the three anomalies $R(D^{(*)})$, $b\to s\mu^+\mu^-$ and $a_{\mu}$ only
two (but any two) can be explained simultaneously.
| [
{
"created": "Mon, 27 Mar 2017 18:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Apr 2017 14:39:19 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Sep 2017 14:15:13 GMT",
"version": "v3"
}
] | 2017-10-11 | [
[
"Crivellin",
"Andreas",
""
],
[
"Müller",
"Dario",
""
],
[
"Ota",
"Toshihiko",
""
]
] | Over the past years, experiments accumulated intriguing hints for new physics (NP) in flavor observables, namely in the anomalous magnetic moment of the muon ($a_\mu$), in $R(D^{(*)})={\rm Br}(B\to D^{(*)}\tau\nu)/{\rm Br}(B\to D^{(*)}\ell\nu)$ and in $b\to s\mu^+\mu^-$ transitions, which are all at the $3-4\,\sigma$ level. In this article we point out that one can explain the $R(D^{(*)})$ anomaly using two scalar leptoquarks (LQs) with the same mass and coupling to fermions related via a discrete symmetry: an $SU(2)$ singlet and an $SU(2)$ triplet, both with hypercharge $Y=-2/3$. In this way, potentially dangerous contributions to $b\to s\nu\nu$ are avoided and non-CKM suppressed effects in $R(D^{(*)})$ can be generated. This allows for smaller overall couplings to fermions weakening the direct LHC bounds. In our model, $R(D^{(*)})$ is directly correlated to $b\to s\tau^+\tau^-$ transitions where an enhancement by orders of magnitude compared to the standard model (SM) is predicted, such that these decay modes are in the reach of LHCb and BELLE II. Furthermore, one can also naturally explain the $b\to s\mu^+\mu^-$ anomalies (including $R(K)$) by a $C_9=-C_{10}$ like contribution without spoiling $\mu-e$ universality in charged current decays. In this case sizable effects in $b\to s\tau\mu$ transitions are predicted which are again well within the experimental reach. One can even address the longstanding anomaly in $a_\mu$, generating a sizable decay rate for $\tau\to\mu\gamma$. However, we find that out of the three anomalies $R(D^{(*)})$, $b\to s\mu^+\mu^-$ and $a_{\mu}$ only two (but any two) can be explained simultaneously. |
1805.08659 | Brian Maddock | Wolfgang Altmannshofer, Brian Maddock | Flavorful Two Higgs Doublet Models with a Twist | 42 pages, 8 figures, 4 tables | Phys. Rev. D 98, 075005 (2018) | 10.1103/PhysRevD.98.075005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore Two Higgs Doublet Models with non-standard flavor structures. In
analogy to the four, well studied, models with natural flavor conservation
(type 1, type 2, lepton-specific, flipped), we identify four models that
preserve an approximate $U(2)^5$ flavor symmetry acting on the first two
generations. In all four models, the couplings of the 125 GeV Higgs are
modified in characteristic flavor non-universal ways. The heavy neutral and
charged Higgs bosons show an interesting non-standard phenomenology. We discuss
their production and decay modes and identify the most sensitive search
channels at the LHC. We study the effects on low energy flavor violating
processes finding relevant constraints from $B_d$ and $B_s$ meson oscillations
and from the rare decay $B_s \to \mu^+ \mu^-$. We also find that lepton flavor
violating $B$ meson decays like $B_s \to \tau \mu$ and $B \to K^{(*)} \tau \mu$
might have branching ratios at an observable level.
| [
{
"created": "Tue, 22 May 2018 15:18:50 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Nov 2018 19:47:27 GMT",
"version": "v2"
}
] | 2018-11-08 | [
[
"Altmannshofer",
"Wolfgang",
""
],
[
"Maddock",
"Brian",
""
]
] | We explore Two Higgs Doublet Models with non-standard flavor structures. In analogy to the four, well studied, models with natural flavor conservation (type 1, type 2, lepton-specific, flipped), we identify four models that preserve an approximate $U(2)^5$ flavor symmetry acting on the first two generations. In all four models, the couplings of the 125 GeV Higgs are modified in characteristic flavor non-universal ways. The heavy neutral and charged Higgs bosons show an interesting non-standard phenomenology. We discuss their production and decay modes and identify the most sensitive search channels at the LHC. We study the effects on low energy flavor violating processes finding relevant constraints from $B_d$ and $B_s$ meson oscillations and from the rare decay $B_s \to \mu^+ \mu^-$. We also find that lepton flavor violating $B$ meson decays like $B_s \to \tau \mu$ and $B \to K^{(*)} \tau \mu$ might have branching ratios at an observable level. |
hep-ph/9710387 | Sergei Chekanov | S.V.Chekanov | Local Properties of Local Multiplicity Distributions | LaTeX, 12 pages, 4 eps figures, Presented at the International
School-Seminar "The actual problems of particle physics" (NCPHEP-Dubna)
Gomel, Belarus, August 8-17, 1997 | null | null | null | hep-ph | null | Some aspects of applications of bunching parameters are discussed. It is
investigated to what extent Monte-Carlo models, which have been tuned to
reproduce global event-shape variables and single-particle inclusive
distributions, agree with each other.
| [
{
"created": "Fri, 17 Oct 1997 12:43:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chekanov",
"S. V.",
""
]
] | Some aspects of applications of bunching parameters are discussed. It is investigated to what extent Monte-Carlo models, which have been tuned to reproduce global event-shape variables and single-particle inclusive distributions, agree with each other. |
2308.10942 | Xiaohui Liu | Xiao Lin Li, Xiaohui Liu, Feng Yuan and Hua Xing Zhu | Illuminating Nucleon Gluon Interference via Calorimetric Asymmetry | 6 pages, 5 figures | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We present an innovative approach to the linearly polarized gluons confined
inside the unpolarized nucleon in lepton-nucleon scattering. Our method
analyzes the correlation of energy flows at azimuthal separations $\phi$. The
interference of the spinning gluon with both positive and negative helicities
translates into a $\cos(2\phi)$ asymmetry imprinted on the detector. Unlike the
conventional transverse momentum dependent (TMD) probes, the $\cos(2\phi)$
asymmetry in this approach is preserved by rotational symmetry, holds to all
orders, and is free of radiation contamination, thus expected to provide the
exquisite signature of the nucleon linearly polarized gluons.
| [
{
"created": "Mon, 21 Aug 2023 18:00:02 GMT",
"version": "v1"
}
] | 2023-08-23 | [
[
"Li",
"Xiao Lin",
""
],
[
"Liu",
"Xiaohui",
""
],
[
"Yuan",
"Feng",
""
],
[
"Zhu",
"Hua Xing",
""
]
] | We present an innovative approach to the linearly polarized gluons confined inside the unpolarized nucleon in lepton-nucleon scattering. Our method analyzes the correlation of energy flows at azimuthal separations $\phi$. The interference of the spinning gluon with both positive and negative helicities translates into a $\cos(2\phi)$ asymmetry imprinted on the detector. Unlike the conventional transverse momentum dependent (TMD) probes, the $\cos(2\phi)$ asymmetry in this approach is preserved by rotational symmetry, holds to all orders, and is free of radiation contamination, thus expected to provide the exquisite signature of the nucleon linearly polarized gluons. |
hep-ph/0204136 | Shaaban Khalil | G.C. Branco, M.E. Gomez, S. Khalil and A.M. Teixeira | Supersymmetry and a rationale for small CP violating phases | 30 pages, 5 figures. Version to appear in Nucl. Phys. B | Nucl.Phys.B659:119,2003 | 10.1016/S0550-3213(03)00230-X | FISIST/14-2001/CFIF, IPPP/01/58, DCPT/01/114 | hep-ph | null | We analyse the CP problem in the context of a supersymmetric extension of the
standard model with universal strength of Yukawa couplings. A salient feature
of these models is that the CP phases are constrained to be very small by the
hierarchy of the quark masses, and the pattern of CKM mixing angles. This leads
to a small amount of CP violation from the usual KM mechanism and a significant
contribution from supersymmetry is required. Due to the large generation mixing
in some of the supersymmetric interactions, the electric dipole moments impose
severe constraints on the parameter space, forcing the trilinear couplings to
be factorizable in matrix form. We find that the LL mass insertions give the
dominant gluino contribution to saturate epsilon_K. The chargino contributions
to epsilon'/epsilon are significant and can accommodate the experimental
results. In this framework, the standard model gives a negligible contribution
to the CP asymmetry in B-meson decay, a_{J/\psi K_s}. However, due to
supersymmetric contributions to B_d-\bar{B}_d mixing, the recent large value of
a_{J/\psi K_s} can be accommodated.
| [
{
"created": "Fri, 12 Apr 2002 11:26:43 GMT",
"version": "v1"
},
{
"created": "Sat, 13 Apr 2002 08:43:50 GMT",
"version": "v2"
},
{
"created": "Thu, 10 Apr 2003 22:12:20 GMT",
"version": "v3"
}
] | 2009-09-25 | [
[
"Branco",
"G. C.",
""
],
[
"Gomez",
"M. E.",
""
],
[
"Khalil",
"S.",
""
],
[
"Teixeira",
"A. M.",
""
]
] | We analyse the CP problem in the context of a supersymmetric extension of the standard model with universal strength of Yukawa couplings. A salient feature of these models is that the CP phases are constrained to be very small by the hierarchy of the quark masses, and the pattern of CKM mixing angles. This leads to a small amount of CP violation from the usual KM mechanism and a significant contribution from supersymmetry is required. Due to the large generation mixing in some of the supersymmetric interactions, the electric dipole moments impose severe constraints on the parameter space, forcing the trilinear couplings to be factorizable in matrix form. We find that the LL mass insertions give the dominant gluino contribution to saturate epsilon_K. The chargino contributions to epsilon'/epsilon are significant and can accommodate the experimental results. In this framework, the standard model gives a negligible contribution to the CP asymmetry in B-meson decay, a_{J/\psi K_s}. However, due to supersymmetric contributions to B_d-\bar{B}_d mixing, the recent large value of a_{J/\psi K_s} can be accommodated. |
1610.03849 | Asher Berlin | Asher Berlin, Dan Hooper | Axion-Assisted Production of Sterile Neutrino Dark Matter | 5 pages, 3 figures | Phys. Rev. D 95, 075017 (2017) | 10.1103/PhysRevD.95.075017 | FERMILAB-PUB-16-423-A, SLAC-PUB-16838 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Sterile neutrinos can be generated in the early universe through oscillations
with active neutrinos and represent a popular and well-studied candidate for
our universe's dark matter. Stringent constraints from X-ray and gamma-ray line
searches, however, have excluded the simplest of such models. In this letter,
we propose a novel alternative to the standard scenario in which the mixing
angle between the sterile and active neutrinos is a dynamical quantity, induced
through interactions with a light axion-like field. As the energy density of
the axion-like particles is diluted by Hubble expansion, the degree of mixing
is reduced at late times, suppressing the decay rate and easily alleviating any
tension with X-ray or gamma-ray constraints. We present a simple model which
illustrates the phenomenology of this scenario, and also describe a framework
in which the QCD axion is responsible for the production of sterile neutrinos
in the early universe.
| [
{
"created": "Wed, 12 Oct 2016 20:00:00 GMT",
"version": "v1"
}
] | 2017-04-19 | [
[
"Berlin",
"Asher",
""
],
[
"Hooper",
"Dan",
""
]
] | Sterile neutrinos can be generated in the early universe through oscillations with active neutrinos and represent a popular and well-studied candidate for our universe's dark matter. Stringent constraints from X-ray and gamma-ray line searches, however, have excluded the simplest of such models. In this letter, we propose a novel alternative to the standard scenario in which the mixing angle between the sterile and active neutrinos is a dynamical quantity, induced through interactions with a light axion-like field. As the energy density of the axion-like particles is diluted by Hubble expansion, the degree of mixing is reduced at late times, suppressing the decay rate and easily alleviating any tension with X-ray or gamma-ray constraints. We present a simple model which illustrates the phenomenology of this scenario, and also describe a framework in which the QCD axion is responsible for the production of sterile neutrinos in the early universe. |
hep-ph/9610225 | Luciano Rezzolla | L. Rezzolla (SISSA and Dept. of Physics, Univ. of Illinois at
Urbana-Champaign) | Baryon number segregation at the end of the cosmological quark-hadron
transition | 33 pages, Latex file, 6 postscript figures included in the text
(psfig.tex). To appear in Phys. Rev. D15 | Phys.Rev. D54 (1996) 6072-6082 | 10.1103/PhysRevD.54.6072 | SISSA 144/96/A | hep-ph astro-ph | null | One of the most interesting questions regarding a possible first order
cosmological quark--hadron phase transition concerns the final fate of the
baryon number contained within the disconnected quark regions at the end of the
transition. We here present a detailed investigation of the hydrodynamical
evolution of an evaporating quark drop, using a multi-component fluid
description to follow the mechanisms of baryon number segregation. With this
approach, we are able to take account of the simultaneous effects of baryon
number flux suppression at the phase interface, entropy extraction by means of
particles having long mean-free-paths, and baryon number diffusion. A range of
computations has been performed to investigate the permitted parameter-space
and this has shown that significant baryon number concentrations, perhaps even
up to densities above that of nuclear matter, represent an inevitable outcome
within this scenario.
| [
{
"created": "Wed, 2 Oct 1996 22:15:22 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Rezzolla",
"L.",
"",
"SISSA and Dept. of Physics, Univ. of Illinois at\n Urbana-Champaign"
]
] | One of the most interesting questions regarding a possible first order cosmological quark--hadron phase transition concerns the final fate of the baryon number contained within the disconnected quark regions at the end of the transition. We here present a detailed investigation of the hydrodynamical evolution of an evaporating quark drop, using a multi-component fluid description to follow the mechanisms of baryon number segregation. With this approach, we are able to take account of the simultaneous effects of baryon number flux suppression at the phase interface, entropy extraction by means of particles having long mean-free-paths, and baryon number diffusion. A range of computations has been performed to investigate the permitted parameter-space and this has shown that significant baryon number concentrations, perhaps even up to densities above that of nuclear matter, represent an inevitable outcome within this scenario. |
1611.05060 | Farvah Mahmoudi | F. Mahmoudi, T. Hurth, S. Neshatpour | Present Status of b -> s l+ l- Anomalies | 6 pages, 6 figures. Contribution to the proceedings of the Sixth
Workshop on Theory, Phenomenology and Experiments in Flavour Physics - Capri,
June 2016 | null | null | CERN-TH-2016-231, IPM/PA-450, MITP/16-113 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the observed deviations in b -> s l+ l- processes from the
Standard Model predictions and present global fits for the New Physics
description of these anomalies. We further investigate the stability of the
global fits under different theoretical assumptions and suggest strategies and
a number of observables to clear up the source of the anomalies.
| [
{
"created": "Tue, 15 Nov 2016 21:19:09 GMT",
"version": "v1"
}
] | 2016-11-17 | [
[
"Mahmoudi",
"F.",
""
],
[
"Hurth",
"T.",
""
],
[
"Neshatpour",
"S.",
""
]
] | We discuss the observed deviations in b -> s l+ l- processes from the Standard Model predictions and present global fits for the New Physics description of these anomalies. We further investigate the stability of the global fits under different theoretical assumptions and suggest strategies and a number of observables to clear up the source of the anomalies. |
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