id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1012.1178 | Tzvetalina Stavreva | T. Stavreva, I. Schienbein, F. Arleo, K. Kovarik, F. Olness, J.Y. Yu,
J.F. Owens | Probing gluon and heavy-quark nuclear PDFs with photon + heavy quark
production in pA collisions | null | JHEP 1101:152,2011 | 10.1007/JHEP01(2011)152 | LPSC-10-140, KA-TP-29-2010 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a detailed phenomenological study of direct photon production in
association with a heavy-quark jet in pA collisions at the Relativistic Heavy
Ion Collider (RHIC) and at the Large Hadron Collider (LHC) at next-to-leading
order in QCD. The dominant contribution to the cross-section comes from the
gluon--heavy-quark (gQ) initiated subprocess, making \gamma + Q production a
process very sensitive to both the gluon and the heavy-quark parton
distribution functions (PDFs). Additionally, the RHIC and LHC experiments are
probing complementary kinematic regions in the momentum fraction x_2 carried by
the target partons. Thus, the nuclear production ratio R^{\gamma+Q}_{pA} can
provide strong constraints, over a broad x-range, on the poorly determined
nuclear parton distribution functions which are extremely important for the
interpretation of results in heavy-ion collisions.
| [
{
"created": "Mon, 6 Dec 2010 14:26:19 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jan 2011 17:50:52 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Stavreva",
"T.",
""
],
[
"Schienbein",
"I.",
""
],
[
"Arleo",
"F.",
""
],
[
"Kovarik",
"K.",
""
],
[
"Olness",
"F.",
""
],
[
"Yu",
"J. Y.",
""
],
[
"Owens",
"J. F.",
""
]
] | We present a detailed phenomenological study of direct photon production in association with a heavy-quark jet in pA collisions at the Relativistic Heavy Ion Collider (RHIC) and at the Large Hadron Collider (LHC) at next-to-leading order in QCD. The dominant contribution to the cross-section comes from the gluon--heavy-quark (gQ) initiated subprocess, making \gamma + Q production a process very sensitive to both the gluon and the heavy-quark parton distribution functions (PDFs). Additionally, the RHIC and LHC experiments are probing complementary kinematic regions in the momentum fraction x_2 carried by the target partons. Thus, the nuclear production ratio R^{\gamma+Q}_{pA} can provide strong constraints, over a broad x-range, on the poorly determined nuclear parton distribution functions which are extremely important for the interpretation of results in heavy-ion collisions. |
hep-ph/0701209 | Maxim Dvornikov | Maxim Dvornikov (1 and 2), Jukka Maalampi (1 and 3) ((1) University of
Jyv\"askyl\"a, (2) IZMIRAN, (3) Helsinki Institute of Physics) | Evolution of Mixed Dirac Particles Interacting with an External Magnetic
Field | 10 pages, 1 eps figure, RevTeX4; new appendix devoted to quantum
mechanical treatment of neutrino spin-flavor oscillations was added; final
variant to be published in Phys. Lett. B | Phys.Lett.B657:217-227,2007 | 10.1016/j.physletb.2007.10.019 | null | hep-ph hep-th | null | We study in the framework of relativistic quantum mechanics the evolution of
a system of two Dirac neutrinos that mix with each other and have non-vanishing
magnetic moments. The dynamics of this system in an external magnetic field is
determined by solving the Pauli-Dirac equation with a given initial condition.
We consider first neutrino spin-flavor oscillations in a constant magnetic
field and derive an analytical expression for the transition probability of
spin-flavor conversion in the limit of small magnetic interactions. We then
investigate ultrarelativistic neutrinos in an transversal magnetic field and
derive their wave functions and transition probabilities with no limitation for
the size of transition magnetic moments. Although we consider neutrinos, our
formalism is straightforwardly applicable to any spin-1/2 particles.
| [
{
"created": "Wed, 24 Jan 2007 20:48:48 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Feb 2007 14:59:49 GMT",
"version": "v2"
},
{
"created": "Wed, 1 Aug 2007 09:19:45 GMT",
"version": "v3"
},
{
"created": "Wed, 10 Oct 2007 07:12:46 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Dvornikov",
"Maxim",
"",
"1 and 2"
],
[
"Maalampi",
"Jukka",
"",
"1 and 3"
]
] | We study in the framework of relativistic quantum mechanics the evolution of a system of two Dirac neutrinos that mix with each other and have non-vanishing magnetic moments. The dynamics of this system in an external magnetic field is determined by solving the Pauli-Dirac equation with a given initial condition. We consider first neutrino spin-flavor oscillations in a constant magnetic field and derive an analytical expression for the transition probability of spin-flavor conversion in the limit of small magnetic interactions. We then investigate ultrarelativistic neutrinos in an transversal magnetic field and derive their wave functions and transition probabilities with no limitation for the size of transition magnetic moments. Although we consider neutrinos, our formalism is straightforwardly applicable to any spin-1/2 particles. |
1812.01860 | Roman Zhokhov | T. G. Khunjua, K.G. Klimenko, R. N. Zhokhov-Larionov | Affinity of NJL$_2$ and NJL$_{4}$ model results on duality and pion
condensation in chiral asymmetric dense quark matter | Proceedings of XXth International Seminar on High Energy Physics,
QUARKS-2018 | EPJ Web Conf. 191 (2018) 05016 | 10.1051/epjconf/201819105016 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate the phase structure of a (1+1) and
(3+1)-dimensional quark model with four-quark interaction and in the presence
of baryon ($\mu_B$), isospin ($\mu_I$) and chiral isospin ($\mu_{I5}$) chemical
potentials. It is shown that the chemical potential $\mu_{I5}$ promotes the
appearance of the charged PC phase with nonzero baryon density. Results of both
models are qualitatively the same, this fact enhances one's confidence in %the
faith in the obtained predictions. It is established that in the large-$N_c$
limit ($N_c$ is the number of colored quarks) there exists a duality
correspondence between the chiral symmetry breaking phase and the charged pion
condensation one.
| [
{
"created": "Wed, 5 Dec 2018 08:57:06 GMT",
"version": "v1"
}
] | 2018-12-06 | [
[
"Khunjua",
"T. G.",
""
],
[
"Klimenko",
"K. G.",
""
],
[
"Zhokhov-Larionov",
"R. N.",
""
]
] | In this paper we investigate the phase structure of a (1+1) and (3+1)-dimensional quark model with four-quark interaction and in the presence of baryon ($\mu_B$), isospin ($\mu_I$) and chiral isospin ($\mu_{I5}$) chemical potentials. It is shown that the chemical potential $\mu_{I5}$ promotes the appearance of the charged PC phase with nonzero baryon density. Results of both models are qualitatively the same, this fact enhances one's confidence in %the faith in the obtained predictions. It is established that in the large-$N_c$ limit ($N_c$ is the number of colored quarks) there exists a duality correspondence between the chiral symmetry breaking phase and the charged pion condensation one. |
1805.03880 | A. N. Ivanov | A. N. Ivanov, R. H\"ollwieser, N. I. Troitskaya, M. Wellenzohn, Ya. A.
Berdnikov | Tests of the Standard Model in Neutron Beta Decay with Polarized Neutron
and Electron and Unpolarized Proton | 15 pages, 1 figure | Phys. Rev. C 98, 035503 (2018) | 10.1103/PhysRevC.98.035503 | null | hep-ph astro-ph.CO nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the electron--energy and angular distribution of the neutron beta
decay with polarized neutron and electron and unpolarized proton, calculated in
Phys. Rev. C 95, 055502 (2017) within the Standard Model (SM), by taking into
account the contributions of interactions beyond the SM. After the absorption
of vector and axial vector contributions by the axial coupling constant and
Cabibbo-Kobayashi-Maskawa (CKM) matrix element (Bhattacharya et al., Phys. Rev.
D 85, 054512 (2012) and so on) these are the contributions of scalar and tensor
interactions only. The neutron lifetime, correlation coefficients and their
averaged values, and asymmetries of the neutron beta decay with polarized
neutron and electron are adapted to the analysis of experimental data on
searches of contributions of interactions beyond the SM. Using the obtained
results we propose some estimates of the values of the scalar and tensor
coupling constants of interactions beyond the SM. We use the estimate of the
Fierz interference term "b_F = - 0.0028 +/- 0.0026" by Hardy and Towner (Phys.
Rev. C 91, 025501 (2015)), the neutron lifetime "tau_n = 880.2(1.0)s"(Particle
Data Group, Chin. Phys. C 40, 100001 (2016)) and the experimental data
"N_{\exp} = 0.067 +/- 0.011_{\rm stat.} +/- 0.004_{\rm syst.}" for the averaged
value of the correlation coefficient of the neutron-electron spin-spin
correlations, measured by Kozela et al. (Phys. Ref. C 85, 045501 (2012)). The
contributions of G-odd correlations are calculated and found at the level of
10^{-5} in agreement with the results obtained by Gardner and Plaster (Phys.
Rev. C 87, 065504 (2013)).
| [
{
"created": "Thu, 10 May 2018 08:35:36 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Nov 2018 21:53:15 GMT",
"version": "v2"
}
] | 2018-11-14 | [
[
"Ivanov",
"A. N.",
""
],
[
"Höllwieser",
"R.",
""
],
[
"Troitskaya",
"N. I.",
""
],
[
"Wellenzohn",
"M.",
""
],
[
"Berdnikov",
"Ya. A.",
""
]
] | We analyse the electron--energy and angular distribution of the neutron beta decay with polarized neutron and electron and unpolarized proton, calculated in Phys. Rev. C 95, 055502 (2017) within the Standard Model (SM), by taking into account the contributions of interactions beyond the SM. After the absorption of vector and axial vector contributions by the axial coupling constant and Cabibbo-Kobayashi-Maskawa (CKM) matrix element (Bhattacharya et al., Phys. Rev. D 85, 054512 (2012) and so on) these are the contributions of scalar and tensor interactions only. The neutron lifetime, correlation coefficients and their averaged values, and asymmetries of the neutron beta decay with polarized neutron and electron are adapted to the analysis of experimental data on searches of contributions of interactions beyond the SM. Using the obtained results we propose some estimates of the values of the scalar and tensor coupling constants of interactions beyond the SM. We use the estimate of the Fierz interference term "b_F = - 0.0028 +/- 0.0026" by Hardy and Towner (Phys. Rev. C 91, 025501 (2015)), the neutron lifetime "tau_n = 880.2(1.0)s"(Particle Data Group, Chin. Phys. C 40, 100001 (2016)) and the experimental data "N_{\exp} = 0.067 +/- 0.011_{\rm stat.} +/- 0.004_{\rm syst.}" for the averaged value of the correlation coefficient of the neutron-electron spin-spin correlations, measured by Kozela et al. (Phys. Ref. C 85, 045501 (2012)). The contributions of G-odd correlations are calculated and found at the level of 10^{-5} in agreement with the results obtained by Gardner and Plaster (Phys. Rev. C 87, 065504 (2013)). |
2207.14300 | Douglas Tuckler | Yu-Ming Chen, Manibrata Sen, Walter Tangarife, Douglas Tuckler, and
Yue Zhang | Core-collapse Supernova Constraint on the Origin of Sterile Neutrino
Dark Matter via Neutrino Self-interactions | 22 pages, 7 Figures, 3 appendices | null | 10.1088/1475-7516/2022/11/014 | null | hep-ph astro-ph.CO astro-ph.SR | http://creativecommons.org/licenses/by/4.0/ | Novel neutrino self-interaction can open up viable parameter space for the
relic abundance of sterile-neutrino dark matter (S$\nu$DM). In this work, we
constrain the relic target using core-collapse supernova which features the
same fundamental process and a similar environment to the early universe era
when S$\nu$DM is dominantly produced. We present a detailed calculation of the
effects of a massive scalar mediated neutrino self-interaction on the supernova
cooling rate, including the derivation of the thermal potential in the presence
of non-zero chemical potentials from plasma species. Our results demonstrate
that the supernova cooling argument can cover the neutrino self-interaction
parameter space that complements terrestrial and cosmological probes.
| [
{
"created": "Thu, 28 Jul 2022 18:00:00 GMT",
"version": "v1"
}
] | 2022-11-16 | [
[
"Chen",
"Yu-Ming",
""
],
[
"Sen",
"Manibrata",
""
],
[
"Tangarife",
"Walter",
""
],
[
"Tuckler",
"Douglas",
""
],
[
"Zhang",
"Yue",
""
]
] | Novel neutrino self-interaction can open up viable parameter space for the relic abundance of sterile-neutrino dark matter (S$\nu$DM). In this work, we constrain the relic target using core-collapse supernova which features the same fundamental process and a similar environment to the early universe era when S$\nu$DM is dominantly produced. We present a detailed calculation of the effects of a massive scalar mediated neutrino self-interaction on the supernova cooling rate, including the derivation of the thermal potential in the presence of non-zero chemical potentials from plasma species. Our results demonstrate that the supernova cooling argument can cover the neutrino self-interaction parameter space that complements terrestrial and cosmological probes. |
1505.01168 | Roberto Vega-Morales | Yi Chen, Daniel Stolarski, Roberto Vega-Morales | Golden Probe of the Top Yukuwa | references and footnote added | Phys. Rev. D 92, 053003 (2015) | 10.1103/PhysRevD.92.053003 | CERN-PH-TH-2015-106, LPT-Orsay-15-32 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a preliminary study of the ability of the Higgs decay to four
leptons to shed light on the top quark Yukawa couplings. In particular we
examine whether the $h\to 4\ell$ `golden channel' is sensitive to the $CP$
properties of the top quark couplings to the Higgs boson. We show that
kinematic distributions are sensitive to interference of the next-to-leading
order electroweak corrections with the tree level $ZZ$ contribution. This
translates into a sensitivity to the top quark Yukawa couplings such that
meaningful constraints on their $CP$ properties can begin to be obtained once
$\sim 300$ fb$^{-1}$ of data has been collected at $\sim 14$ TeV, with
significant improvements at higher luminosity or with a higher energy hadron
collider. This makes the $h\to4\ell$ channel a useful probe of the top quark
Yukawa couplings that is qualitatively different from already established
searches in $h\to V\gamma$ two body decays, $tth$, and $gg\to h$. We also
briefly discuss other potential possibilities for probing the top Yukawa $CP$
properties in $h\to2\ell\gamma$ and $\ell^+\ell^-\to h Z, h\gamma$.
| [
{
"created": "Tue, 5 May 2015 20:01:38 GMT",
"version": "v1"
},
{
"created": "Mon, 18 May 2015 12:39:40 GMT",
"version": "v2"
}
] | 2015-09-23 | [
[
"Chen",
"Yi",
""
],
[
"Stolarski",
"Daniel",
""
],
[
"Vega-Morales",
"Roberto",
""
]
] | We perform a preliminary study of the ability of the Higgs decay to four leptons to shed light on the top quark Yukawa couplings. In particular we examine whether the $h\to 4\ell$ `golden channel' is sensitive to the $CP$ properties of the top quark couplings to the Higgs boson. We show that kinematic distributions are sensitive to interference of the next-to-leading order electroweak corrections with the tree level $ZZ$ contribution. This translates into a sensitivity to the top quark Yukawa couplings such that meaningful constraints on their $CP$ properties can begin to be obtained once $\sim 300$ fb$^{-1}$ of data has been collected at $\sim 14$ TeV, with significant improvements at higher luminosity or with a higher energy hadron collider. This makes the $h\to4\ell$ channel a useful probe of the top quark Yukawa couplings that is qualitatively different from already established searches in $h\to V\gamma$ two body decays, $tth$, and $gg\to h$. We also briefly discuss other potential possibilities for probing the top Yukawa $CP$ properties in $h\to2\ell\gamma$ and $\ell^+\ell^-\to h Z, h\gamma$. |
1209.1376 | Kenichi Konishi | Kenichi Konishi | Non-Abelian confinement and the dual gauge symmetry: Many faces of
flavor symmetry | Latex 10 pages, 1 figure | null | 10.1016/j.nuclphysbps.2012.12.044 | IFUP-TH/2012-15 | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the physics of confinement based on non-Abelian dual superconductor
picture, relying on exact solutions in N=2 supersymmetric QCD and based on the
recent developments in our understanding of non-Abelian vortices and monopoles.
The non-Abelian monopoles, though they are basically just the 't Hooft-Polyakov
SU(2) monopoles embedded in various corners of the larger gauge group, require
flavor symmetry in an essential way for their very existence. The phenomenon of
flavor-color-flavor separation characterizes the multiple roles flavor symmetry
plays in producing quantum-mechanical non-Abelian monopoles.
| [
{
"created": "Thu, 6 Sep 2012 19:16:02 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Konishi",
"Kenichi",
""
]
] | We review the physics of confinement based on non-Abelian dual superconductor picture, relying on exact solutions in N=2 supersymmetric QCD and based on the recent developments in our understanding of non-Abelian vortices and monopoles. The non-Abelian monopoles, though they are basically just the 't Hooft-Polyakov SU(2) monopoles embedded in various corners of the larger gauge group, require flavor symmetry in an essential way for their very existence. The phenomenon of flavor-color-flavor separation characterizes the multiple roles flavor symmetry plays in producing quantum-mechanical non-Abelian monopoles. |
hep-ph/0005216 | Grzegorz Wilk | M.Rybczynski, Z.Wlodarczyk and G.Wilk | Self-organized criticality in atmospheric cascades | gz-compressed .tar file containing LaTeX file and 5 PS files with
figures, 4 pages altogether (Nucl. Phys. B style, espcrc2.sty file attached)
Presented at XI International Symposium On Very High Energy Cosmic Ray
Interaction, Campinas, Brazil, July 17-21, 2000. To be published in Nucl.
Phys. B (Proc. Suppl.). Some typos corrected | Nucl.Phys.Proc.Suppl. 97 (2001) 81-84 | 10.1016/S0920-5632(01)01185-9 | null | hep-ph astro-ph nucl-th | null | We argue that atmospheric cascades can be regarded as example of the
self-organized criticality and studied by using Levy flights and nonextensive
approach. It allows us to understand the scale-invariant energy fluctuations
inside cascades in a natural way.
| [
{
"created": "Mon, 22 May 2000 10:26:35 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Aug 2000 14:35:05 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Rybczynski",
"M.",
""
],
[
"Wlodarczyk",
"Z.",
""
],
[
"Wilk",
"G.",
""
]
] | We argue that atmospheric cascades can be regarded as example of the self-organized criticality and studied by using Levy flights and nonextensive approach. It allows us to understand the scale-invariant energy fluctuations inside cascades in a natural way. |
hep-ph/9311264 | Leutwyler Heinrich | H. Leutwyler | Nonrelativistic effective Lagrangians | 30 pages, BUTP-93/25 | Phys.Rev. D49 (1994) 3033-3043 | 10.1103/PhysRevD.49.3033 | null | hep-ph | null | Chiral perturbation theory is extended to nonrelativistic systems with
spontaneously broken symmetry. In the effective Lagrangian, order parameters
associated with the generators of the group manifest themselves as effective
coupling constants of a topological term, which is gauge invariant only up to a
total derivative. In the case of the ferromagnet, a term connected with the
Brouwer degree dominates the derivative expansion. The general analysis
includes antiferromagnetic magnons and phonons, while the effective field
theory of fluids or gases is beyond the scope of the method.
| [
{
"created": "Wed, 10 Nov 1993 18:14:37 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Leutwyler",
"H.",
""
]
] | Chiral perturbation theory is extended to nonrelativistic systems with spontaneously broken symmetry. In the effective Lagrangian, order parameters associated with the generators of the group manifest themselves as effective coupling constants of a topological term, which is gauge invariant only up to a total derivative. In the case of the ferromagnet, a term connected with the Brouwer degree dominates the derivative expansion. The general analysis includes antiferromagnetic magnons and phonons, while the effective field theory of fluids or gases is beyond the scope of the method. |
1802.00962 | Albi Kerbizi | A. Kerbizi, X. Artru, Z. Belghobsi, F. Bradamante and A. Martin | Recursive model for the fragmentation of polarized quarks | 18 pages, 18 figures | Phys. Rev. D 97, 074010 (2018) | 10.1103/PhysRevD.97.074010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a model for Monte Carlo simulation of the fragmentation of a
polarized quark. The model is based on string dynamics and the ${}^3P_0$
mechanism of quark pair creation at string breaking. The fragmentation is
treated as a recursive process, where the splitting function of the subprocess
$q \to h + q'$ depends on the spin density matrix of the quark $q$. The
${}^3P_0$ mechanism is parametrized by a complex mass parameter $\mu$, the
imaginary part of which is responsible for single spin asymmetries. The model
has been implemented in a Monte Carlo program to simulate jets made of
pseudoscalar mesons. Results for single hadron and hadron pair transverse-spin
asymmetries are found to be in agreement with experimental data from SIDIS and
$e^+e^-$ annihilation. The model predictions on the jet-handedness are also
discussed.
| [
{
"created": "Sat, 3 Feb 2018 12:03:29 GMT",
"version": "v1"
}
] | 2018-04-18 | [
[
"Kerbizi",
"A.",
""
],
[
"Artru",
"X.",
""
],
[
"Belghobsi",
"Z.",
""
],
[
"Bradamante",
"F.",
""
],
[
"Martin",
"A.",
""
]
] | We present a model for Monte Carlo simulation of the fragmentation of a polarized quark. The model is based on string dynamics and the ${}^3P_0$ mechanism of quark pair creation at string breaking. The fragmentation is treated as a recursive process, where the splitting function of the subprocess $q \to h + q'$ depends on the spin density matrix of the quark $q$. The ${}^3P_0$ mechanism is parametrized by a complex mass parameter $\mu$, the imaginary part of which is responsible for single spin asymmetries. The model has been implemented in a Monte Carlo program to simulate jets made of pseudoscalar mesons. Results for single hadron and hadron pair transverse-spin asymmetries are found to be in agreement with experimental data from SIDIS and $e^+e^-$ annihilation. The model predictions on the jet-handedness are also discussed. |
1106.5647 | Michael Kr\"amer | Wim Beenakker, Silja Brensing, Monica D'Onofrio, Michael Kr\"amer,
Anna Kulesza, Eric Laenen, Mario Martinez, Irene Niessen | Improved squark and gluino mass limits from searches for supersymmetry
at hadron colliders | 10 pages, 6 figures; removed redundant figures | null | 10.1103/PhysRevD.85.075014 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Squarks and gluinos have been searched for at hadron colliders in events with
multiple jets and missing transverse energy. No excess has been observed to
date, and from a comparison of experimental cross section limits and
theoretical cross section predictions one can deduce lower bounds on the squark
and gluino masses. We present an improved analysis of squark and gluino mass
bounds which is based on state-of-the-art cross section calculations including
the summation of large threshold corrections. For illustration, we consider
experimental data obtained by the CDF collaboration at the Fermilab Tevatron
and discuss the impact of the improved cross section predictions on the squark
and gluino mass limits.
| [
{
"created": "Tue, 28 Jun 2011 12:37:29 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jun 2011 10:56:44 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Beenakker",
"Wim",
""
],
[
"Brensing",
"Silja",
""
],
[
"D'Onofrio",
"Monica",
""
],
[
"Krämer",
"Michael",
""
],
[
"Kulesza",
"Anna",
""
],
[
"Laenen",
"Eric",
""
],
[
"Martinez",
"Mario",
""
],
[
"Niessen",
"Irene",
""
]
] | Squarks and gluinos have been searched for at hadron colliders in events with multiple jets and missing transverse energy. No excess has been observed to date, and from a comparison of experimental cross section limits and theoretical cross section predictions one can deduce lower bounds on the squark and gluino masses. We present an improved analysis of squark and gluino mass bounds which is based on state-of-the-art cross section calculations including the summation of large threshold corrections. For illustration, we consider experimental data obtained by the CDF collaboration at the Fermilab Tevatron and discuss the impact of the improved cross section predictions on the squark and gluino mass limits. |
2001.03655 | Fatma Aslan | Fatma P. Aslan and Matthias Burkardt | Lorentz invariance relations for twist-3 quark distributions | null | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate twist-3 parton ditribution functions (PDFs) using cut and uncut
diagrams. Uncut diagrams lead to a Dirac delta function term. No such term
appears when cut diagrams are used. We show that a $\delta(x)$ is necessary to
satisfy the Lorentz invariance relations of twist-3 PDFs, except for the
Burkhardt-Cottingham sum rule in QCD.
| [
{
"created": "Fri, 10 Jan 2020 20:27:12 GMT",
"version": "v1"
}
] | 2020-01-14 | [
[
"Aslan",
"Fatma P.",
""
],
[
"Burkardt",
"Matthias",
""
]
] | We calculate twist-3 parton ditribution functions (PDFs) using cut and uncut diagrams. Uncut diagrams lead to a Dirac delta function term. No such term appears when cut diagrams are used. We show that a $\delta(x)$ is necessary to satisfy the Lorentz invariance relations of twist-3 PDFs, except for the Burkhardt-Cottingham sum rule in QCD. |
hep-ph/0601185 | Antonio Pineda | Antonio Pineda and Adrian Signer | Renormalization Group Improved Sum Rule Analysis for the Bottom Quark
Mass | 4 pages, two figures | Phys.Rev.D73:111501,2006 | 10.1103/PhysRevD.73.111501 | UB-ECM-PF-06-04; IPPP/06/05 | hep-ph | null | We study the effect of resumming large logarithms in the determination of the
bottom quark mass through a non-relativistic sum rule analysis. Our result is
complete at next-to-leading-logarithmic accuracy and includes some known
contributions at next-to-next-to-leading logarithmic accuracy. Compared to
finite order computations, the reliability of the theoretical evaluation is
greatly improved, resulting in a substantially reduced scale dependence and a
faster convergent perturbative series. This allows us to significantly improve
over previous determinations of the $\MS$ bottom quark mass, $\bar{m}_b$, from
non-relativistic sum rules. Our final figure reads
$\bar{m}_b(\bar{m}_b)=4.19\pm 0.06$ GeV.
| [
{
"created": "Mon, 23 Jan 2006 11:50:59 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Pineda",
"Antonio",
""
],
[
"Signer",
"Adrian",
""
]
] | We study the effect of resumming large logarithms in the determination of the bottom quark mass through a non-relativistic sum rule analysis. Our result is complete at next-to-leading-logarithmic accuracy and includes some known contributions at next-to-next-to-leading logarithmic accuracy. Compared to finite order computations, the reliability of the theoretical evaluation is greatly improved, resulting in a substantially reduced scale dependence and a faster convergent perturbative series. This allows us to significantly improve over previous determinations of the $\MS$ bottom quark mass, $\bar{m}_b$, from non-relativistic sum rules. Our final figure reads $\bar{m}_b(\bar{m}_b)=4.19\pm 0.06$ GeV. |
hep-ph/0511250 | Neal Weiner | Spencer Chang (CCPP, NYU), Patrick J. Fox (LBNL), Neal Weiner (CCPP,
NYU) | Naturalness and Higgs Decays in the MSSM with a Singlet | 3 figures, 1 appendix; version to appear in JHEP; typos fixed and
additional references and acknowledgements added | JHEP 0608:068,2006 | 10.1088/1126-6708/2006/08/068 | null | hep-ph | null | The simplest extension of the supersymmetric standard model - the addition of
one singlet superfield - can have a profound impact on the Higgs and its
decays. We perform a general operator analysis of this scenario, focusing on
the phenomenologically distinct scenarios that can arise, and not restricting
the scope to the narrow framework of the NMSSM. We reexamine decays to four b
quarks and four tau's, finding that they are still generally viable, but at the
edge of LEP limits. We find a broad set of Higgs decay modes, some new,
including those with four gluon final states, as well as more general six and
eight parton final states. We find the phenomenology of these scenarios is
dramatically impacted by operators typically ignored, specifically those
arising from D-terms in the hidden sector, and those arising from weak-scale
colored fields. In addition to sensitivity of m_Z, there are potential tunings
of other aspects of the spectrum. In spite of this, these models can be very
natural, with light stops and a Higgs as light as 82 GeV. These scenarios
motivate further analyses of LEP data as well as studies of the detection
capabilities of future colliders to the new decay channels presented.
| [
{
"created": "Mon, 21 Nov 2005 20:53:26 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Aug 2006 19:22:53 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Chang",
"Spencer",
"",
"CCPP, NYU"
],
[
"Fox",
"Patrick J.",
"",
"LBNL"
],
[
"Weiner",
"Neal",
"",
"CCPP,\n NYU"
]
] | The simplest extension of the supersymmetric standard model - the addition of one singlet superfield - can have a profound impact on the Higgs and its decays. We perform a general operator analysis of this scenario, focusing on the phenomenologically distinct scenarios that can arise, and not restricting the scope to the narrow framework of the NMSSM. We reexamine decays to four b quarks and four tau's, finding that they are still generally viable, but at the edge of LEP limits. We find a broad set of Higgs decay modes, some new, including those with four gluon final states, as well as more general six and eight parton final states. We find the phenomenology of these scenarios is dramatically impacted by operators typically ignored, specifically those arising from D-terms in the hidden sector, and those arising from weak-scale colored fields. In addition to sensitivity of m_Z, there are potential tunings of other aspects of the spectrum. In spite of this, these models can be very natural, with light stops and a Higgs as light as 82 GeV. These scenarios motivate further analyses of LEP data as well as studies of the detection capabilities of future colliders to the new decay channels presented. |
hep-ph/0311332 | Dilip Kumar Ghosh | N. G. Deshpande, D. K. Ghosh | Flavor and CP violating Z exchange and the rate asymmetry in B --> phi
K_S | 15 pages, Latex, 2 postscript figures. Sections 2 and 3 are
reordered. More references are added. Version to be published in PLB | Phys.Lett.B593:135-142,2004 | 10.1016/j.physletb.2004.04.060 | OITS-742 | hep-ph | null | Recent measurements of time dependent CP asymmetry in B --> phi K_S, if
confirmed, would indicate a new source of CP violation. We examine flavor
violating tree-level Z currents in models with extra down-type quark singlets
that arise naturally in string compactified gauge groups like E_6. We evaluate
the new operators at the scale mu = m_b in NLO, and using QCD improved
factorization to describe B --> phi K_S, find the allowed range of parameters
for rho and psi, the magnitude and phase of the flavor violating parameter
U_{bs}. This allowed range does satisfy the constraint from flavor changing
process b --> s l+ l- . However, further improvement in measurement of these
rates could severely constrain the model.
| [
{
"created": "Wed, 26 Nov 2003 01:11:43 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Feb 2004 00:48:49 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Jun 2004 20:35:22 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Deshpande",
"N. G.",
""
],
[
"Ghosh",
"D. K.",
""
]
] | Recent measurements of time dependent CP asymmetry in B --> phi K_S, if confirmed, would indicate a new source of CP violation. We examine flavor violating tree-level Z currents in models with extra down-type quark singlets that arise naturally in string compactified gauge groups like E_6. We evaluate the new operators at the scale mu = m_b in NLO, and using QCD improved factorization to describe B --> phi K_S, find the allowed range of parameters for rho and psi, the magnitude and phase of the flavor violating parameter U_{bs}. This allowed range does satisfy the constraint from flavor changing process b --> s l+ l- . However, further improvement in measurement of these rates could severely constrain the model. |
1508.04383 | Mikael Berggren | M. Berggren (1), A. Cakir (1,2), D. Kr\"ucker (1), J. List (1), I. A.
Melzer-Pellmann (1), B. Safarzadeh Samani (1,3), C. Seitz (1), S. Wayand (4)
((1) DESY, Hamburg, Germany, (2) Istanbul Technical University, Turkey, (3)
IPM, Tehran, Iran, (4) KIT IEKP, Karlsruhe, Germany) | Non-Simplified SUSY: Stau-Coannihilation at LHC and ILC | 42 pages, 18 figures, 12 tables | null | 10.1140/epjc/s10052-016-3914-2 | DESY 15-145 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If new phenomena beyond the Standard Model will be discovered at the LHC, the
properties of the new particles could be determined with data from the
High-Luminosity LHC and from a future linear collider like the ILC. We discuss
the possible interplay between measurements at the two accelerators in a
concrete example, namely a full SUSY model which features a small stau_1-LSP
mass difference. Various channels have been studied using the Snowmass 2013
combined LHC detector implementation in the Delphes simulation package, as well
as simulations of the ILD detector concept from the Technical Design Report. We
investigate both the LHC and ILC capabilities for discovery, separation and
identification of various parts of the spectrum. While some parts would be
discovered at the LHC, there is substantial room for further discoveries at the
ILC. We finally highlight examples where the precise knowledge about the lower
part of the mass spectrum which could be acquired at the ILC would enable a
more in-depth analysis of the LHC data with respect to the heavier states.
| [
{
"created": "Tue, 18 Aug 2015 17:08:23 GMT",
"version": "v1"
}
] | 2016-05-04 | [
[
"Berggren",
"M.",
""
],
[
"Cakir",
"A.",
""
],
[
"Krücker",
"D.",
""
],
[
"List",
"J.",
""
],
[
"Melzer-Pellmann",
"I. A.",
""
],
[
"Samani",
"B. Safarzadeh",
""
],
[
"Seitz",
"C.",
""
],
[
"Wayand",
"S.",
""
]
] | If new phenomena beyond the Standard Model will be discovered at the LHC, the properties of the new particles could be determined with data from the High-Luminosity LHC and from a future linear collider like the ILC. We discuss the possible interplay between measurements at the two accelerators in a concrete example, namely a full SUSY model which features a small stau_1-LSP mass difference. Various channels have been studied using the Snowmass 2013 combined LHC detector implementation in the Delphes simulation package, as well as simulations of the ILD detector concept from the Technical Design Report. We investigate both the LHC and ILC capabilities for discovery, separation and identification of various parts of the spectrum. While some parts would be discovered at the LHC, there is substantial room for further discoveries at the ILC. We finally highlight examples where the precise knowledge about the lower part of the mass spectrum which could be acquired at the ILC would enable a more in-depth analysis of the LHC data with respect to the heavier states. |
1703.00914 | Joe Davighi | Joe Davighi, Philip Harris | Fractal based observables to probe jet substructure of quarks and gluons | [v1] 11 pages 4 figures [v2] 13 pages, 5 figures [v3] 9 pages, 7
figures. v2 added comment on how the observable can preserve infrared safety,
updated acknowledgement, added diagram about visualization. v3 added
comparison of performance in Herwig and Pythia, added comparison between two
different EFO fitting functions, and added figure showing dependence on
transverse momentum | Eur.Phys.J. C78 (2018) no.4, 334 | 10.1140/epjc/s10052-018-5819-8 | DAMTP-2017-03-06 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New jet observables are defined which characterize both fractal and
scale-dependent contributions to the distribution of hadrons in a jet. These
infrared safe observables, named Extended Fractal Observables (EFOs), have been
applied to quark-gluon discrimination to demonstrate their potential utility.
The EFOs are found to be individually discriminating and only weakly correlated
to variables used in existing discriminators. Consequently, their inclusion
improves discriminator performance, as here demonstrated with particle level
simulation from the parton shower.
| [
{
"created": "Thu, 2 Mar 2017 19:00:13 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Apr 2017 10:52:27 GMT",
"version": "v2"
},
{
"created": "Wed, 9 May 2018 12:22:26 GMT",
"version": "v3"
}
] | 2018-05-10 | [
[
"Davighi",
"Joe",
""
],
[
"Harris",
"Philip",
""
]
] | New jet observables are defined which characterize both fractal and scale-dependent contributions to the distribution of hadrons in a jet. These infrared safe observables, named Extended Fractal Observables (EFOs), have been applied to quark-gluon discrimination to demonstrate their potential utility. The EFOs are found to be individually discriminating and only weakly correlated to variables used in existing discriminators. Consequently, their inclusion improves discriminator performance, as here demonstrated with particle level simulation from the parton shower. |
hep-ph/9903282 | Wu-Ki Tung | H. L. Lai, J. Huston, S. Kuhlmann, J. Morfin, F. Olness, J. F. Owens,
J. Pumplin, W. K. Tung | Global QCD Analysis of Parton Structure of the Nucleon: CTEQ5 Parton
Distributions | 18 pages in 2up format, 21 figures; This is the version to appear in
publication (to appear in Eur. Phys. J. C): minor text modifications; some
figures improved in quality; note added in proof concerning QCD evolution
added | Eur.Phys.J.C12:375-392,2000 | 10.1007/s100529900196 | MSU-HEP/903100 | hep-ph | null | An up-to-date global QCD analysis of high energy lepton-hadron and
hadron-hadron interactions is performed to better determine the gluon and quark
parton distributions in the nucleon. Improved experimental data on inclusive
jet production, in conjunction with precise deep inelastic scattering data,
place good constraints on the gluon over a wide range of x; while new data on
asymmetries in Drell-Yan processes contribute to better determine the d/u
ratio. Comparisons with results of other recent global analyses are made, and
the differences are described. Open issues and the general problem of
determining the uncertainties of parton distributions are discussed.
| [
{
"created": "Mon, 8 Mar 1999 05:47:55 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Mar 1999 21:34:27 GMT",
"version": "v2"
},
{
"created": "Fri, 6 Aug 1999 02:53:18 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Lai",
"H. L.",
""
],
[
"Huston",
"J.",
""
],
[
"Kuhlmann",
"S.",
""
],
[
"Morfin",
"J.",
""
],
[
"Olness",
"F.",
""
],
[
"Owens",
"J. F.",
""
],
[
"Pumplin",
"J.",
""
],
[
"Tung",
"W. K.",
""
]
] | An up-to-date global QCD analysis of high energy lepton-hadron and hadron-hadron interactions is performed to better determine the gluon and quark parton distributions in the nucleon. Improved experimental data on inclusive jet production, in conjunction with precise deep inelastic scattering data, place good constraints on the gluon over a wide range of x; while new data on asymmetries in Drell-Yan processes contribute to better determine the d/u ratio. Comparisons with results of other recent global analyses are made, and the differences are described. Open issues and the general problem of determining the uncertainties of parton distributions are discussed. |
hep-ph/9503491 | null | Marco Masetti and Francesca Sartogo | Perturbative predictions for B_c meson production in hadronic collisions | 17 pages including 6 figures, uu-encoded compressed postscript file | Phys.Lett. B357 (1995) 659-665 | 10.1016/0370-2693(95)00908-4 | Roma preprint 1099-1995 | hep-ph | null | Perturbative cross section for direct B_c meson production in gluon gluon
scattering g g --> B_c^+ b \bar{c} is calculated and compared with other
existing results. Predictions for hadronic B_c production at Tevatron and LHC
are presented and the main sources of uncertainties are discussed.
| [
{
"created": "Sat, 1 Apr 1995 17:05:17 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Masetti",
"Marco",
""
],
[
"Sartogo",
"Francesca",
""
]
] | Perturbative cross section for direct B_c meson production in gluon gluon scattering g g --> B_c^+ b \bar{c} is calculated and compared with other existing results. Predictions for hadronic B_c production at Tevatron and LHC are presented and the main sources of uncertainties are discussed. |
hep-ph/0104060 | Alberto Accardi | A. Accardi | Semi-hard scatterings at RHIC and LHC: initial conditions and charged
multiplicities | 4 pages, 4 figures. Talk given at "XXXVI rencontres de Moriond: QCD
and hadronic interactions", Les Arcs (FRA), 17-24 march 2001 interactions | null | null | null | hep-ph | null | Minijet production in ultra-relativistic heavy-ion collisions is discussed by
taking semi-hard parton rescatterings explicitly into account. At both RHIC and
LHC energies we find sizable effects on global characteristics of the nuclear
collision like the initial multiplicity and transverse energy of the minijets.
The dependence of these quantities on the cutoff that separates soft and hard
interactions becomes much smoother after the inclusion of the rescatterings.
This allows to define an energy and centrality dependent saturation cutoff and
to push perturbative computations to rather low values of the cutoff. As an
application we compute the charged multiplicity at mid rapidity and compare it
to the recent RHIC data.
| [
{
"created": "Thu, 5 Apr 2001 15:16:20 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Accardi",
"A.",
""
]
] | Minijet production in ultra-relativistic heavy-ion collisions is discussed by taking semi-hard parton rescatterings explicitly into account. At both RHIC and LHC energies we find sizable effects on global characteristics of the nuclear collision like the initial multiplicity and transverse energy of the minijets. The dependence of these quantities on the cutoff that separates soft and hard interactions becomes much smoother after the inclusion of the rescatterings. This allows to define an energy and centrality dependent saturation cutoff and to push perturbative computations to rather low values of the cutoff. As an application we compute the charged multiplicity at mid rapidity and compare it to the recent RHIC data. |
hep-ph/0306260 | Silvano Simula | S. Simula and M. Osipenko | New extraction of alpha_s(MZ) from proton DIS data | revised version to appear in NPB: addition of resummation of
anomalous dimensions; negligible changes in the results; no change in the
conclusions | Nucl.Phys. B675 (2003) 289-308 | 10.1016/j.nuclphysb.2003.09.057 | preprint RM3-TH/03-6 | hep-ph nucl-th | null | An exploratory study for a new determination of the strong coupling constant
alpha_s(MZ) from existing world data on the proton structure function F2p in
the Q**2-range from ~ 5 to ~ 120 (GeV/c)**2 is presented. The main features of
our approach are: 1) the use of low-order Nachtmann moments evaluated with a
direct contribution from data larger than 70% of the total; 2) the inclusion of
high-order perturbative effects through the soft gluon resummation technique;
3) a direct control over higher-twist effects; and 4) the independence from any
specific choice of the x-shape of the input parton distributions. At
next-to-leading order we get alpha_s(MZ) = 0.1209 +/- 0.0010 (stat.) +/- 0.0015
(syst.) with a significant dependence upon the order of the moment used.
Including soft gluon effects we obtain alpha_s(MZ) = 0.1188 +/- 0.0010 (stat.)
+/- 0.0014 (syst.) with a remarkable better stability against the order of the
moment. Our findings are compared with recent DIS determinations of alpha_s(MZ)
and directions for future improvements are discussed.
| [
{
"created": "Thu, 26 Jun 2003 12:16:24 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Sep 2003 07:20:43 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Simula",
"S.",
""
],
[
"Osipenko",
"M.",
""
]
] | An exploratory study for a new determination of the strong coupling constant alpha_s(MZ) from existing world data on the proton structure function F2p in the Q**2-range from ~ 5 to ~ 120 (GeV/c)**2 is presented. The main features of our approach are: 1) the use of low-order Nachtmann moments evaluated with a direct contribution from data larger than 70% of the total; 2) the inclusion of high-order perturbative effects through the soft gluon resummation technique; 3) a direct control over higher-twist effects; and 4) the independence from any specific choice of the x-shape of the input parton distributions. At next-to-leading order we get alpha_s(MZ) = 0.1209 +/- 0.0010 (stat.) +/- 0.0015 (syst.) with a significant dependence upon the order of the moment used. Including soft gluon effects we obtain alpha_s(MZ) = 0.1188 +/- 0.0010 (stat.) +/- 0.0014 (syst.) with a remarkable better stability against the order of the moment. Our findings are compared with recent DIS determinations of alpha_s(MZ) and directions for future improvements are discussed. |
hep-ph/0012349 | A. A. Arkhipov | A.A. Arkhipov | Three-body forces, single diffraction dissociation and shadow
corrections to hadron-deuteron total cross-sections | Latex, 9 figures, the talk presented at the Workshop "QFTHEP2000",
Tver, Russia, September 14-20, 2000 | null | null | IHEP 2000-59, Protvino 2000 | hep-ph astro-ph nucl-th | null | The relationships between the fundamental dynamics and diffraction phenomena
in scattering from two-body composite system are discussed. A new simple
formula for the shadow corrections to the total cross-section in scattering
from deuteron has been derived and new scaling characteristics with a clear
physical interpretation have been established. The effect of weakening the
inelastic screening at super-high energies is theoretically discovered. A
comparison with the experimental data on proton(antiproton)-deuteron total
cross-sections has been performed. It is shown that there is quite a remarkable
correspondence of the theory with the experimental data.
| [
{
"created": "Wed, 27 Dec 2000 18:37:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Arkhipov",
"A. A.",
""
]
] | The relationships between the fundamental dynamics and diffraction phenomena in scattering from two-body composite system are discussed. A new simple formula for the shadow corrections to the total cross-section in scattering from deuteron has been derived and new scaling characteristics with a clear physical interpretation have been established. The effect of weakening the inelastic screening at super-high energies is theoretically discovered. A comparison with the experimental data on proton(antiproton)-deuteron total cross-sections has been performed. It is shown that there is quite a remarkable correspondence of the theory with the experimental data. |
1501.00338 | Jun Jiang | Jun Jiang, Long-Bin Chen and Cong-Feng Qiao | The QCD NLO Corrections to Inclusive $B^*_c$ Production in $Z^{0}$
Decays | 17 pages, 11 figures; v2:typos fixed, references added, Fig.5
replaced, revised version; to appear in PRD | Phys. Rev. D 91, 034033 (2015) | 10.1103/PhysRevD.91.034033 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the next-to-leading order(NLO) quantum chromodynamics(QCD)
corrections to the inclusive process of $Z_0 \rightarrow B^*_c+\bar{c}+b$ under
the non-relativistic QCD(NRQCD) factorization scheme. Technical details about
contributions from vector and axial-vector currents in dimensional
regularization scheme are discussed. Numerical calculation shows that the NLO
correction enhances the leading-order decay width by about 50%, and the
dependence on renormalization scale $\mu$ is reduced. The uncertainties induced
by quark masses and the renormalization scale $\mu$ are also analyzed.
| [
{
"created": "Fri, 2 Jan 2015 02:21:17 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Feb 2015 01:41:40 GMT",
"version": "v2"
}
] | 2015-03-05 | [
[
"Jiang",
"Jun",
""
],
[
"Chen",
"Long-Bin",
""
],
[
"Qiao",
"Cong-Feng",
""
]
] | We calculate the next-to-leading order(NLO) quantum chromodynamics(QCD) corrections to the inclusive process of $Z_0 \rightarrow B^*_c+\bar{c}+b$ under the non-relativistic QCD(NRQCD) factorization scheme. Technical details about contributions from vector and axial-vector currents in dimensional regularization scheme are discussed. Numerical calculation shows that the NLO correction enhances the leading-order decay width by about 50%, and the dependence on renormalization scale $\mu$ is reduced. The uncertainties induced by quark masses and the renormalization scale $\mu$ are also analyzed. |
1811.07528 | Katarzyna Krajewska | K. Krajewska, J. Z. Kami\'nski | Threshold effects in electron-positron pair creation from the vacuum:
Stabilization and longitudinal vs transverse momentum sharing | 8 pages, 8 figures | Phys. Rev. A 100, 012104 (2019) | 10.1103/PhysRevA.100.012104 | null | hep-ph physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Momentum distributions of electron-positron pairs created from the vacuum by
an oscillating in time electric field are calculated in the framework of
quantum field theory. A pronounced enhancement of those distributions is
observed as the frequency of the electric field passes across the one-photon
threshold. Below that threshold the pairs preferentially carry a longitudinal
momentum, while above the threshold they tend to carry a transverse momentum.
Such momentum sharing has an impact on the number of produced pairs: It grows
fast with increasing the field frequency below the threshold but it saturates
at a roughly constant value above it. On the other hand, at the fixed frequency
above the one-photon threshold, the number of pairs scales quadratically with
the field strength. This typically perturbative scaling holds even for large
electric fields. Thus, the validity of the perturbation theory is extended here
to processes which result in creation of particles with substantial transverse
momenta.
| [
{
"created": "Mon, 19 Nov 2018 07:08:24 GMT",
"version": "v1"
}
] | 2019-07-10 | [
[
"Krajewska",
"K.",
""
],
[
"Kamiński",
"J. Z.",
""
]
] | Momentum distributions of electron-positron pairs created from the vacuum by an oscillating in time electric field are calculated in the framework of quantum field theory. A pronounced enhancement of those distributions is observed as the frequency of the electric field passes across the one-photon threshold. Below that threshold the pairs preferentially carry a longitudinal momentum, while above the threshold they tend to carry a transverse momentum. Such momentum sharing has an impact on the number of produced pairs: It grows fast with increasing the field frequency below the threshold but it saturates at a roughly constant value above it. On the other hand, at the fixed frequency above the one-photon threshold, the number of pairs scales quadratically with the field strength. This typically perturbative scaling holds even for large electric fields. Thus, the validity of the perturbation theory is extended here to processes which result in creation of particles with substantial transverse momenta. |
hep-ph/0206227 | Yadong Yang | Gad Eilam and Yadong Yang | Semi-inclusive Decay $B\to \phi X_s$: Rate and Momentum Spectrum of
$\phi$ | 19 pages, 4 figures | Phys.Rev. D66 (2002) 074010 | 10.1103/PhysRevD.66.074010 | null | hep-ph | null | We study the rate and $\phi$ momentum distribution in semi-inclusive decays
$B \to\phi X_s $ induced by the quark level processes $b\to\phi s$ and
$b\to\phi s g$, in which the gluon is radiated from the internal charm quark
loop or emitted from the virtual gluon of the strong penguin (inner
bremsstrahlung). We find ${\cal B}(b\to\phi s)=6.7\times 10^{-5}$ and ${\cal
B}(b\to\phi s g)=3.8\times 10^{-5}$. The momentum spectrum of $\phi$ produced
by $b\to\phi s g $ is very broad. With the cut $|{\bf k}_{\phi}|\geq 2.0$ GeV,
${\cal B}(b\to\phi s)=6.1\times 10^{-5}$ (where the Fermi motion of the
$b$-quark in the $B$-meson is described by a Gaussian), and ${\cal B}(b\to\phi
s g)=1.0\times 10^{-5}$. Due to the special nature of $\phi$, many difficulties
which hindered a reliable theoretical prediction for $B\to \eta' X_s$ decay are
absent in the process $B\to \phi X_s$. Therefore, theoretical predictions for
$B\to \phi X_s$ are relatively clean. Moreover, the clear experimental
signature of the $\phi$ is of great help. Data for $B\to\phi X_s$, both the
branching ratio and the $\phi$ momentum distribution, would teach us about the
strength of strong penguins which might be of great importance in the search
for CP violation and for new physics at $B$ factories.
| [
{
"created": "Mon, 24 Jun 2002 06:58:04 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Eilam",
"Gad",
""
],
[
"Yang",
"Yadong",
""
]
] | We study the rate and $\phi$ momentum distribution in semi-inclusive decays $B \to\phi X_s $ induced by the quark level processes $b\to\phi s$ and $b\to\phi s g$, in which the gluon is radiated from the internal charm quark loop or emitted from the virtual gluon of the strong penguin (inner bremsstrahlung). We find ${\cal B}(b\to\phi s)=6.7\times 10^{-5}$ and ${\cal B}(b\to\phi s g)=3.8\times 10^{-5}$. The momentum spectrum of $\phi$ produced by $b\to\phi s g $ is very broad. With the cut $|{\bf k}_{\phi}|\geq 2.0$ GeV, ${\cal B}(b\to\phi s)=6.1\times 10^{-5}$ (where the Fermi motion of the $b$-quark in the $B$-meson is described by a Gaussian), and ${\cal B}(b\to\phi s g)=1.0\times 10^{-5}$. Due to the special nature of $\phi$, many difficulties which hindered a reliable theoretical prediction for $B\to \eta' X_s$ decay are absent in the process $B\to \phi X_s$. Therefore, theoretical predictions for $B\to \phi X_s$ are relatively clean. Moreover, the clear experimental signature of the $\phi$ is of great help. Data for $B\to\phi X_s$, both the branching ratio and the $\phi$ momentum distribution, would teach us about the strength of strong penguins which might be of great importance in the search for CP violation and for new physics at $B$ factories. |
1109.4297 | Nikos Giokaris | Nikos D. Giokaris | Self coupling of the Higgs boson to the Higgs field and predictions for
the Higgs mass and production cross section at the Fermilab Tevatron Collider | 6 pages, 3 figures | null | null | IASA R10-01 15 July, 2010 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mass-generation mechanism is one of the most important problems in modern
particle physics. The discovery and study of the Higgs boson would greatly
contribute to the understanding and solving of this problem. One of the
unknowns in the Higgs potential is the Higgs quadric self-coupling parameter
{\lambda}. A {\lambda} parameter value equal to 1 leads to the prediction that
the Standard Model Higgs mass is twice the top quark mass or about 347 GeV. It
is, then, argued that this could have a dramatic increase of the SM Higgs
production cross section at the Tevatron and the LHC, thus making possible its
discovery even at the Tevatron with about 5 fb(-1) of integrated luminosity.
| [
{
"created": "Tue, 20 Sep 2011 13:58:56 GMT",
"version": "v1"
}
] | 2011-09-21 | [
[
"Giokaris",
"Nikos D.",
""
]
] | The mass-generation mechanism is one of the most important problems in modern particle physics. The discovery and study of the Higgs boson would greatly contribute to the understanding and solving of this problem. One of the unknowns in the Higgs potential is the Higgs quadric self-coupling parameter {\lambda}. A {\lambda} parameter value equal to 1 leads to the prediction that the Standard Model Higgs mass is twice the top quark mass or about 347 GeV. It is, then, argued that this could have a dramatic increase of the SM Higgs production cross section at the Tevatron and the LHC, thus making possible its discovery even at the Tevatron with about 5 fb(-1) of integrated luminosity. |
1904.11265 | Sourendu Gupta | Sourendu Gupta and Rishi Sharma | Real time warm pions from the lattice using an effective theory | null | null | null | TIFR/TH/19-16 | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lattice measurements provide adequate information to fix the parameters of
long distance effective field theories in Euclidean time. Using such a theory,
we examine the analytic continuation of long distance correlation functions of
composite operators at finite temperature from Euclidean to Minkowski space
time. There are two definitions of mass in each regime; in Euclidean these are
the screening and pole masses. The analytic continuation of these mass
parameters to real time is non-trivial. This is in contrast to the situation at
zero temperature.
| [
{
"created": "Thu, 25 Apr 2019 11:28:27 GMT",
"version": "v1"
}
] | 2019-04-26 | [
[
"Gupta",
"Sourendu",
""
],
[
"Sharma",
"Rishi",
""
]
] | Lattice measurements provide adequate information to fix the parameters of long distance effective field theories in Euclidean time. Using such a theory, we examine the analytic continuation of long distance correlation functions of composite operators at finite temperature from Euclidean to Minkowski space time. There are two definitions of mass in each regime; in Euclidean these are the screening and pole masses. The analytic continuation of these mass parameters to real time is non-trivial. This is in contrast to the situation at zero temperature. |
1402.2658 | Tim M. P. Tait | Andre de Gouvea, Daniel Hernandez, Tim M.P. Tait | Criteria for Natural Hierarchies | v2: corrected discussion of gravitational corrections to include an
important contribution previously neglected | Phys. Rev. D 89, 115005 (2014) | 10.1103/PhysRevD.89.115005 | NUHEP-TH/14-01, UCI-HEP-TR-2013-20 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With the discovery of a particle that seems rather consistent with the
minimal Standard Model Higgs boson, attention turns to questions of
naturalness, fine-tuning, and what they imply for physics beyond the Standard
Model and its discovery prospects at run II of the LHC. In this article we
revisit the issue of naturalness, discussing some implicit assumptions that
underly some of the most common statements, which tend to assign physical
significance to certain regularization procedures. Vague arguments concerning
fine-tuning can lead to conclusions that are too strong and perhaps not as
generic as one would hope. Instead, we explore a more pragmatic definition of
the hierarchy problem that does not rely on peeking beyond the murky boundaries
of quantum field theory: we investigate the fine-tuning of the electroweak
scale associated with thresholds from heavy particles, which is both calculable
and dependent on the nature of the would-be ultraviolet completion of the
Standard Model. We discuss different manifestations of new high-energy scales
that are favored by experimental hints for new physics with an eye toward
making use of fine-tuning in order to determine natural regions of the new
physics parameter spaces.
| [
{
"created": "Tue, 11 Feb 2014 21:01:05 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Mar 2014 19:50:35 GMT",
"version": "v2"
}
] | 2014-06-11 | [
[
"de Gouvea",
"Andre",
""
],
[
"Hernandez",
"Daniel",
""
],
[
"Tait",
"Tim M. P.",
""
]
] | With the discovery of a particle that seems rather consistent with the minimal Standard Model Higgs boson, attention turns to questions of naturalness, fine-tuning, and what they imply for physics beyond the Standard Model and its discovery prospects at run II of the LHC. In this article we revisit the issue of naturalness, discussing some implicit assumptions that underly some of the most common statements, which tend to assign physical significance to certain regularization procedures. Vague arguments concerning fine-tuning can lead to conclusions that are too strong and perhaps not as generic as one would hope. Instead, we explore a more pragmatic definition of the hierarchy problem that does not rely on peeking beyond the murky boundaries of quantum field theory: we investigate the fine-tuning of the electroweak scale associated with thresholds from heavy particles, which is both calculable and dependent on the nature of the would-be ultraviolet completion of the Standard Model. We discuss different manifestations of new high-energy scales that are favored by experimental hints for new physics with an eye toward making use of fine-tuning in order to determine natural regions of the new physics parameter spaces. |
hep-ph/0607224 | Dominik Nickel | Dominik Nickel | Extraction of Spectral Functions from Dyson-Schwinger Studies via the
Maximum Entropy Method | 16 pages, 7 figures | AnnalsPhys.322:1949-1960,2007 | 10.1016/j.aop.2006.09.002 | null | hep-ph hep-lat nucl-th | null | It is shown how to apply the Maximum Entropy Method (MEM) to numerical
Dyson-Schwinger studies for the extraction of spectral functions of correlators
from their corresponding Euclidean propagators. Differences to the application
in lattice QCD are emphasized and, as an example, the spectral functions of
massless quarks in cold and dense matter are presented.
| [
{
"created": "Thu, 20 Jul 2006 11:34:24 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Nickel",
"Dominik",
""
]
] | It is shown how to apply the Maximum Entropy Method (MEM) to numerical Dyson-Schwinger studies for the extraction of spectral functions of correlators from their corresponding Euclidean propagators. Differences to the application in lattice QCD are emphasized and, as an example, the spectral functions of massless quarks in cold and dense matter are presented. |
2203.02004 | Sarunas Verner | Simon Clery, Yann Mambrini, Keith A. Olive, Andrey Shkerin, Sarunas
Verner | Gravitational Portals with Non-Minimal Couplings | 14 pages, 8 figures | null | 10.1103/PhysRevD.105.095042 | UMN--TH--4116/22, FTPI--MINN--22/07, CERN-TH-2022-025 | hep-ph astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider the effects of non-minimal couplings to curvature of the form
$\xi_S S^2 R$, for three types of scalars: the Higgs boson, the inflaton, and a
scalar dark matter candidate. We compute the abundance of dark matter produced
by these non-minimal couplings to gravity and compare to similar results with
minimal couplings. We also compute the contribution to the radiation bath
during reheating. The main effect is a potential augmentation of the maximum
temperature during reheating. A model independent limit of
$\mathcal{O}(10^{12})$ GeV is obtained. For couplings $\xi_S \gtrsim
\mathcal{O}(1)$, these dominate over minimal gravitational interactions.
| [
{
"created": "Thu, 3 Mar 2022 20:39:52 GMT",
"version": "v1"
}
] | 2022-06-08 | [
[
"Clery",
"Simon",
""
],
[
"Mambrini",
"Yann",
""
],
[
"Olive",
"Keith A.",
""
],
[
"Shkerin",
"Andrey",
""
],
[
"Verner",
"Sarunas",
""
]
] | We consider the effects of non-minimal couplings to curvature of the form $\xi_S S^2 R$, for three types of scalars: the Higgs boson, the inflaton, and a scalar dark matter candidate. We compute the abundance of dark matter produced by these non-minimal couplings to gravity and compare to similar results with minimal couplings. We also compute the contribution to the radiation bath during reheating. The main effect is a potential augmentation of the maximum temperature during reheating. A model independent limit of $\mathcal{O}(10^{12})$ GeV is obtained. For couplings $\xi_S \gtrsim \mathcal{O}(1)$, these dominate over minimal gravitational interactions. |
1307.4909 | Mikko Laine | M. Laine | Thermal right-handed neutrino production rate in the relativistic regime | 37 pages. v2: clarification added; published version | JHEP 1308 (2013) 138 | 10.1007/JHEP08(2013)138 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The production rate of right-handed neutrinos from a Standard Model plasma at
a temperature above a hundred GeV is evaluated up to NLO in Standard Model
couplings. The results apply in the so-called relativistic regime, referring
parametrically to a mass M ~ pi T, generalizing thereby previous NLO results
which only apply in the non-relativistic regime M >> pi T. The non-relativistic
expansion is observed to converge for M > 15 T, but the smallness of any loop
corrections allows it to be used in practice already for M > 4 T. In the latter
regime any non-covariant dependence of the differential rate on the spatial
momentum is shown to be mild. The loop expansion breaks down in the
ultrarelativistic regime M << pi T, but after a simple mass resummation it
nevertheless extrapolates reasonably well towards a result obtained previously
through complete LPM resummation, apparently confirming a strong enhancement of
the rate at high temperatures (which facilitates chemical equilibration). When
combined with other ingredients the results may help to improve upon the
accuracy of leptogenesis computations operating above the electroweak scale.
| [
{
"created": "Thu, 18 Jul 2013 11:28:30 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Sep 2013 14:28:46 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Laine",
"M.",
""
]
] | The production rate of right-handed neutrinos from a Standard Model plasma at a temperature above a hundred GeV is evaluated up to NLO in Standard Model couplings. The results apply in the so-called relativistic regime, referring parametrically to a mass M ~ pi T, generalizing thereby previous NLO results which only apply in the non-relativistic regime M >> pi T. The non-relativistic expansion is observed to converge for M > 15 T, but the smallness of any loop corrections allows it to be used in practice already for M > 4 T. In the latter regime any non-covariant dependence of the differential rate on the spatial momentum is shown to be mild. The loop expansion breaks down in the ultrarelativistic regime M << pi T, but after a simple mass resummation it nevertheless extrapolates reasonably well towards a result obtained previously through complete LPM resummation, apparently confirming a strong enhancement of the rate at high temperatures (which facilitates chemical equilibration). When combined with other ingredients the results may help to improve upon the accuracy of leptogenesis computations operating above the electroweak scale. |
1812.07918 | Hiroshi Okada | Chao-Qiang Geng, Hiroshi Okada | Resolving $B$-meson anomalies by flavor-dependent gauged symmetries
$\displaystyle \prod_{i=1}^3U(1)_{B_i-L_i}$ | 13 pages, 2 tables, 2 figures; the part of neutral meson mixings is
modified | null | null | APCTP Pre2018 - 019 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a model with flavor dependent gauged symmetries of $\displaystyle
\prod_{i=1}^3 U(1)_{B_i-L_i}$ with $i$ the family indices. After formulating
the renormalizable Yukawa Lagrangian, Higgs potential and kinetic term, we
study the lepton sector based on a successful two-zero texture without
introducing extra scalar bosons to avoid the dangerous Goldstone bosons. In
particular, we discuss the muon related phenomenologies via additional neutral
gauge bosons. In our numerical analysis, we explore the allowed parameter
space, in which the anomaly of $B \to K^* \bar \mu \mu$ can be explained.
| [
{
"created": "Wed, 19 Dec 2018 12:56:59 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Apr 2019 11:39:53 GMT",
"version": "v2"
}
] | 2019-04-30 | [
[
"Geng",
"Chao-Qiang",
""
],
[
"Okada",
"Hiroshi",
""
]
] | We propose a model with flavor dependent gauged symmetries of $\displaystyle \prod_{i=1}^3 U(1)_{B_i-L_i}$ with $i$ the family indices. After formulating the renormalizable Yukawa Lagrangian, Higgs potential and kinetic term, we study the lepton sector based on a successful two-zero texture without introducing extra scalar bosons to avoid the dangerous Goldstone bosons. In particular, we discuss the muon related phenomenologies via additional neutral gauge bosons. In our numerical analysis, we explore the allowed parameter space, in which the anomaly of $B \to K^* \bar \mu \mu$ can be explained. |
1602.08126 | C. A. de S. Pires | C. A. de S. Pires, J. G. Rodrigues, P. S. Rodrigues da Silva | Realizing the supersymmetric inverse seesaw model in the framework of
R-parity violation | Minor modification of the text. Final version to be published in PLB | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If, on one hand, the inverse seesaw is the paradigm of TeV scale seesaw
mechanism, on the other it is a challenge to find scenarios capable of
realizing it. In this work we propose a scenario, based on the framework of
R-parity violation, that realizes minimally the supersymmetric inverse seesaw
mechanism. In it the energy scale parameters involved in the mechanism are
recognized as the vacuum expectation values of the scalars that compose the
singlet superfields $\hat N^C$ and $\hat S$. We develop also the scalar sector
of the model and show that the Higgs mass receives a new tree-level
contribution that, when combined with the standard contribution plus loop
correction, is capable of attaining $125$GeV without resort to heavy stops.
| [
{
"created": "Thu, 25 Feb 2016 21:41:27 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Apr 2016 16:51:20 GMT",
"version": "v2"
},
{
"created": "Thu, 2 Jun 2016 13:31:44 GMT",
"version": "v3"
}
] | 2016-06-03 | [
[
"Pires",
"C. A. de S.",
""
],
[
"Rodrigues",
"J. G.",
""
],
[
"da Silva",
"P. S. Rodrigues",
""
]
] | If, on one hand, the inverse seesaw is the paradigm of TeV scale seesaw mechanism, on the other it is a challenge to find scenarios capable of realizing it. In this work we propose a scenario, based on the framework of R-parity violation, that realizes minimally the supersymmetric inverse seesaw mechanism. In it the energy scale parameters involved in the mechanism are recognized as the vacuum expectation values of the scalars that compose the singlet superfields $\hat N^C$ and $\hat S$. We develop also the scalar sector of the model and show that the Higgs mass receives a new tree-level contribution that, when combined with the standard contribution plus loop correction, is capable of attaining $125$GeV without resort to heavy stops. |
2207.13714 | Fabian Esser | Ricardo Cepedello, Fabian Esser, Martin Hirsch, Veronica Sanz | Mapping the SMEFT to discoverable models | 33 pages, 11 figures. Version published in JHEP | null | 10.1007/JHEP09(2022)229 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The matching of specific new physics scenarios onto the SMEFT framework is a
well-understood procedure. The inverse problem, the matching of the SMEFT to UV
scenarios, is more difficult and requires the development of new methods to
perform a systematic exploration of models. In this paper we use a diagrammatic
technique to construct in an automated way a complete set of possible UV models
(given certain, well specified assumptions) that can produce specific groups of
SMEFT operators, and illustrate its use by generating models with no tree-level
contributions to four-fermion (4F) operators. Those scenarios, which only
contribute to 4F at one-loop order, can contain relatively light particles that
could be discovered at the LHC in direct searches. For this class of models, we
find an interesting interplay between indirect SMEFT and direct searches. We
discuss some examples on how this interplay would look like when combining
low-energy observables with the SMEFT Higgs-fermion analyses and searches for
resonance at the LHC.
| [
{
"created": "Wed, 27 Jul 2022 18:00:04 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Sep 2023 14:35:00 GMT",
"version": "v2"
}
] | 2023-09-11 | [
[
"Cepedello",
"Ricardo",
""
],
[
"Esser",
"Fabian",
""
],
[
"Hirsch",
"Martin",
""
],
[
"Sanz",
"Veronica",
""
]
] | The matching of specific new physics scenarios onto the SMEFT framework is a well-understood procedure. The inverse problem, the matching of the SMEFT to UV scenarios, is more difficult and requires the development of new methods to perform a systematic exploration of models. In this paper we use a diagrammatic technique to construct in an automated way a complete set of possible UV models (given certain, well specified assumptions) that can produce specific groups of SMEFT operators, and illustrate its use by generating models with no tree-level contributions to four-fermion (4F) operators. Those scenarios, which only contribute to 4F at one-loop order, can contain relatively light particles that could be discovered at the LHC in direct searches. For this class of models, we find an interesting interplay between indirect SMEFT and direct searches. We discuss some examples on how this interplay would look like when combining low-energy observables with the SMEFT Higgs-fermion analyses and searches for resonance at the LHC. |
2105.09350 | Bronislav Zakharov | B.G. Zakharov | Jet quenching from heavy to light ion collisions | 31 pages, 13 figures | null | 10.1007/JHEP09(2021)087 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform an analysis of jet quenching in heavy and light ion collisions for
scenarios without and with quark-gluon plasma formation in $pp$ collisions. We
find that the results for these scenarios are very similar, and both of them
are in reasonable agreement with data for heavy ion collisions. However, their
results become differ significantly for light nuclei. Using the parameters
fitted to heavy ion data on the nuclear modification factor $R_{AA}$, we make
predictions for 0.2 and 7 TeV O+O collisions that can be verified by future
experiments at RHIC and the LHC.
| [
{
"created": "Wed, 19 May 2021 18:33:57 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Oct 2021 17:01:47 GMT",
"version": "v2"
}
] | 2021-10-08 | [
[
"Zakharov",
"B. G.",
""
]
] | We perform an analysis of jet quenching in heavy and light ion collisions for scenarios without and with quark-gluon plasma formation in $pp$ collisions. We find that the results for these scenarios are very similar, and both of them are in reasonable agreement with data for heavy ion collisions. However, their results become differ significantly for light nuclei. Using the parameters fitted to heavy ion data on the nuclear modification factor $R_{AA}$, we make predictions for 0.2 and 7 TeV O+O collisions that can be verified by future experiments at RHIC and the LHC. |
1411.1548 | Larry McLerran | Larry McLerran | A Phenomenological Model of the Glasma and Photon Production | null | null | 10.5506/APhysPolB.45.2307 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I discuss a phenomenological model for the Glasma. I introduce over occupied
distributions for gluons, and compute their time evolution. I use this model to
estimate the ratio of quarks to gluons and the entropy production as functions
of time. I then discuss photon production at RHIC and LHC, and how geometric
scaling and the Glasma might explain generic features of such production.
| [
{
"created": "Thu, 6 Nov 2014 09:57:19 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"McLerran",
"Larry",
""
]
] | I discuss a phenomenological model for the Glasma. I introduce over occupied distributions for gluons, and compute their time evolution. I use this model to estimate the ratio of quarks to gluons and the entropy production as functions of time. I then discuss photon production at RHIC and LHC, and how geometric scaling and the Glasma might explain generic features of such production. |
1810.11420 | She-Sheng Xue | Roberto Leonardi, Orlando Panella, Francesco Romeo, Alfredo Gurrola,
Hao Sun, She-Sheng Xue | Phenomenology at the LHC of composite particles from strongly
interacting Standard Model fermions via four-fermion operators of NJL type | To appear in EPJC. This revised version expands the search for
composite fermion F considering all its possible flavors and topologies and
highlighting the signatures not yet investigated at LHC | The European Physical Journal C volume 80, Article number: 309
(2020) | 10.1140/epjc/s10052-020-7822-0 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new physics scenario shows that four-fermion operators of
Nambu-Jona-Lasinio (NJL) type have a strong-coupling UV fixed point, where
composite fermions $F$ (bosons $\Pi$) form as bound states of three (two) SM
elementary fermions and they couple to their constituents via effective contact
interactions at the composite scale $\Lambda \approx {\cal O} $(TeV). We
present a phenomenological study to investigate such composite particles at the
LHC by computing the production cross sections and decay widths of composite
fermions in the context of the relevant experiments at the LHC with $pp$
collisions at $\sqrt{s}={\rm 13}$ TeV and $\sqrt{s}={\rm 14}$ TeV.
Systematically examining all the different composite particles $F$ and the
signatures with which they can manifest, we found a vast spectrum of composite
particles $F$ that has not yet been explored at the LHC. Recasting the recent
CMS results of the resonant channel $pp\rightarrow e^+F \rightarrow e^+e^-
q\bar{q}'$, we find that the composite fermion mass $m_F$ below 4.25 TeV is
excluded for $\Lambda$/$m_F$ = 1. We further highlight the region of parameter
space where this specific composite particle $F$ can appear using 3 ab$^{-1}$,
expected by the High-Luminosity LHC, computing 3 and 5 $\sigma$ contour plots
of its statistical significance.
| [
{
"created": "Fri, 26 Oct 2018 17:08:16 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Mar 2020 16:31:59 GMT",
"version": "v2"
}
] | 2020-04-13 | [
[
"Leonardi",
"Roberto",
""
],
[
"Panella",
"Orlando",
""
],
[
"Romeo",
"Francesco",
""
],
[
"Gurrola",
"Alfredo",
""
],
[
"Sun",
"Hao",
""
],
[
"Xue",
"She-Sheng",
""
]
] | A new physics scenario shows that four-fermion operators of Nambu-Jona-Lasinio (NJL) type have a strong-coupling UV fixed point, where composite fermions $F$ (bosons $\Pi$) form as bound states of three (two) SM elementary fermions and they couple to their constituents via effective contact interactions at the composite scale $\Lambda \approx {\cal O} $(TeV). We present a phenomenological study to investigate such composite particles at the LHC by computing the production cross sections and decay widths of composite fermions in the context of the relevant experiments at the LHC with $pp$ collisions at $\sqrt{s}={\rm 13}$ TeV and $\sqrt{s}={\rm 14}$ TeV. Systematically examining all the different composite particles $F$ and the signatures with which they can manifest, we found a vast spectrum of composite particles $F$ that has not yet been explored at the LHC. Recasting the recent CMS results of the resonant channel $pp\rightarrow e^+F \rightarrow e^+e^- q\bar{q}'$, we find that the composite fermion mass $m_F$ below 4.25 TeV is excluded for $\Lambda$/$m_F$ = 1. We further highlight the region of parameter space where this specific composite particle $F$ can appear using 3 ab$^{-1}$, expected by the High-Luminosity LHC, computing 3 and 5 $\sigma$ contour plots of its statistical significance. |
hep-ph/9807438 | Conrad John Burden | C.J.Burden | The effect of the ultraviolet part of the gluon propagator on the heavy
quark propagator | 9 pages and one postscript figure | Phys. Rev. D 59, 037502 (1999) | 10.1103/PhysRevD.59.037502 | ANU-HEP-98-5 | hep-ph hep-th | null | We revisit our recently proposed formalism for dealing with the heavy quark
limit of the quark Dyson-Schwinger equation. An ambiguity inherent in the
original version of method is identified and resolved. Our reanalysis
illustrates the importance of correctly accounting for the effect of hard gluon
momenta on the heavy quark self energy in the vicinity of the bare fermion mass
pole.
| [
{
"created": "Tue, 21 Jul 1998 06:54:58 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Nov 1998 00:53:11 GMT",
"version": "v2"
}
] | 2016-08-25 | [
[
"Burden",
"C. J.",
""
]
] | We revisit our recently proposed formalism for dealing with the heavy quark limit of the quark Dyson-Schwinger equation. An ambiguity inherent in the original version of method is identified and resolved. Our reanalysis illustrates the importance of correctly accounting for the effect of hard gluon momenta on the heavy quark self energy in the vicinity of the bare fermion mass pole. |
hep-ph/9809269 | Jose Ramon Espinosa | M. Quiros (IEM, CSIC, Madrid) and J.R. Espinosa (CERN) | What is the upper limit on the lightest supersymmetric Higgs mass? | 7 pages, 4 figures, Work presented at PASCOS-98, March 22-29 1998 | null | null | CERN-TH/98-292, IEM--FT--180/98 | hep-ph | null | In this talk the question of what is the upper bound on the lightest
supersymmetric Higgs mass, m_h is addressed. This question is relevant since
experimental lower bounds on m_h might implement, in the near future, exclusion
of supersymmetry. By imposing (perturbative) unification of the gauge couplings
at some high scale \simgt 10^{17} GeV, we have found that for a top-quark mass
M_t=175 GeV, and depending on the supersymmetric parameters, this bound can be
as high as 205 GeV.
| [
{
"created": "Fri, 4 Sep 1998 14:35:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Quiros",
"M.",
"",
"IEM, CSIC, Madrid"
],
[
"Espinosa",
"J. R.",
"",
"CERN"
]
] | In this talk the question of what is the upper bound on the lightest supersymmetric Higgs mass, m_h is addressed. This question is relevant since experimental lower bounds on m_h might implement, in the near future, exclusion of supersymmetry. By imposing (perturbative) unification of the gauge couplings at some high scale \simgt 10^{17} GeV, we have found that for a top-quark mass M_t=175 GeV, and depending on the supersymmetric parameters, this bound can be as high as 205 GeV. |
1705.03694 | Shuntaro Sakai | S. Sakai, E. Oset, and A. Ramos | Triangle singularities in $B^-\rightarrow K^-\pi^-D_{s0}^+$ and
$B^-\rightarrow K^-\pi^-D_{s1}^+$ | 18 pages, 15 figures, accepted version for publication in Eur. Phys.
J. A | Eur.Phys.J. A54 (2018) no.1, 10 | 10.1140/epja/i2018-12450-5 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the appearance of structures in the decay of the $B^-$ into $K^-
\pi^- D_{s0}^+(2317)$ and $K^- \pi^- D_{s1}^+(2460)$ final states by forming
invariant mass distributions of $\pi^- D_{s0}^+$ and $\pi^- D_{s1}^+$ pairs,
respectively. The structure in the distribution is associated to the
kinematical triangle singularity that appears when the $B^- \to K^- K^{*\,0}
D^0$ ($B^- \to K^- K^{*\,0} D^{*\,0}$) decay process is followed by the decay
of the $K^{*\,0}$ into $\pi^- K^+$ and the subsequent rescattering of the $K^+
D^0$ ($K^+ D^{*\,0}$) pair forming the $D_{s0}^+(2317)$ ($D_{s1}^+(2460)$)
resonance. We find this type of non-resonant peaks at 2850 MeV in the invariant
mass of $\pi^- D_{s0}$ pairs from $B^- \to K^- \pi^- D_{s0}^+(2317)$ decays and
around 3000 MeV in the invariant mass of $\pi^- D_{s1}^+$ pairs from $B^- \to
K^- \pi^- D_{s1}^+(2460)$ decays. By employing the measured branching ratios of
the $B^- \to K^- K^{*\,0} D^0$ and $B^- \to K^- K^{*\,0} D^{*\,0}$ decays, we
predict the branching ratios for the processes $B^-$ into $K^-
\pi^-D_{s0}^+(2317)$ and $K^- \pi^- D_{s1}^+(2460)$, in the vicinity of the
triangle singularity peak, to be about $8\times10^{-6}$ and $1\times 10^{-6}$,
respectively. The observation of this reaction would also give extra support to
the molecular picture of the $D_{s0}^+(2317)$ and $D_{s1}^+(2460)$.
| [
{
"created": "Wed, 10 May 2017 10:50:29 GMT",
"version": "v1"
},
{
"created": "Tue, 23 May 2017 14:22:45 GMT",
"version": "v2"
},
{
"created": "Fri, 30 Jun 2017 18:55:08 GMT",
"version": "v3"
},
{
"created": "Tue, 30 Jan 2018 17:13:58 GMT",
"version": "v4"
}
] | 2018-01-31 | [
[
"Sakai",
"S.",
""
],
[
"Oset",
"E.",
""
],
[
"Ramos",
"A.",
""
]
] | We study the appearance of structures in the decay of the $B^-$ into $K^- \pi^- D_{s0}^+(2317)$ and $K^- \pi^- D_{s1}^+(2460)$ final states by forming invariant mass distributions of $\pi^- D_{s0}^+$ and $\pi^- D_{s1}^+$ pairs, respectively. The structure in the distribution is associated to the kinematical triangle singularity that appears when the $B^- \to K^- K^{*\,0} D^0$ ($B^- \to K^- K^{*\,0} D^{*\,0}$) decay process is followed by the decay of the $K^{*\,0}$ into $\pi^- K^+$ and the subsequent rescattering of the $K^+ D^0$ ($K^+ D^{*\,0}$) pair forming the $D_{s0}^+(2317)$ ($D_{s1}^+(2460)$) resonance. We find this type of non-resonant peaks at 2850 MeV in the invariant mass of $\pi^- D_{s0}$ pairs from $B^- \to K^- \pi^- D_{s0}^+(2317)$ decays and around 3000 MeV in the invariant mass of $\pi^- D_{s1}^+$ pairs from $B^- \to K^- \pi^- D_{s1}^+(2460)$ decays. By employing the measured branching ratios of the $B^- \to K^- K^{*\,0} D^0$ and $B^- \to K^- K^{*\,0} D^{*\,0}$ decays, we predict the branching ratios for the processes $B^-$ into $K^- \pi^-D_{s0}^+(2317)$ and $K^- \pi^- D_{s1}^+(2460)$, in the vicinity of the triangle singularity peak, to be about $8\times10^{-6}$ and $1\times 10^{-6}$, respectively. The observation of this reaction would also give extra support to the molecular picture of the $D_{s0}^+(2317)$ and $D_{s1}^+(2460)$. |
1105.0424 | Xavier Calmet | Xavier Calmet and Ting-Cheng Yang | Gravitational Corrections to Fermion Masses in Grand Unified Theories | 7 pages | Phys.Rev.D84:037701,2011 | 10.1103/PhysRevD.84.037701 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reconsider quantum gravitational threshold effects to the unification of
fermion masses in Grand Unified Theories. We show that the running of the
Planck mass can have a sizable effect on these thresholds which are thus much
more important than naively expected. These corrections make any extrapolation
from low energy measurements challenging.
| [
{
"created": "Mon, 2 May 2011 20:00:03 GMT",
"version": "v1"
}
] | 2011-09-13 | [
[
"Calmet",
"Xavier",
""
],
[
"Yang",
"Ting-Cheng",
""
]
] | We reconsider quantum gravitational threshold effects to the unification of fermion masses in Grand Unified Theories. We show that the running of the Planck mass can have a sizable effect on these thresholds which are thus much more important than naively expected. These corrections make any extrapolation from low energy measurements challenging. |
hep-ph/9412337 | Thomas Mannel | Thomas Mannel and Gerhard Schuler | HQQET: An Effective Theory Approach to Heavy Quarkonia Decays | 14 pages, LaTeX, no figures | Phys.Lett. B349 (1995) 181-188 | 10.1016/0370-2693(95)00240-L | CERN-TH.7523/94, TTP 94-31 | hep-ph | null | We discuss systems containing a heavy quark and a heavy antiquark in the
infinite mass limit of QCD. Studying the limit of equal velocities for both
heavy particles, we formulate an effective theory approach to heavy
quarkonia-like systems. The method is well suited to processes in which the two
heavy quarks annihilate, such as electromagnetic and strong decays of
charmonium and bottomonium and weak decays of $B_c$.
| [
{
"created": "Tue, 20 Dec 1994 19:18:39 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Mannel",
"Thomas",
""
],
[
"Schuler",
"Gerhard",
""
]
] | We discuss systems containing a heavy quark and a heavy antiquark in the infinite mass limit of QCD. Studying the limit of equal velocities for both heavy particles, we formulate an effective theory approach to heavy quarkonia-like systems. The method is well suited to processes in which the two heavy quarks annihilate, such as electromagnetic and strong decays of charmonium and bottomonium and weak decays of $B_c$. |
hep-ph/0503084 | Ismail Turan | Mariana Frank, Ismail Turan (Concordia Univ.) and Marc Sher (William
and Mary) | Neutrino Masses in the Effective Rank-5 Subgroups of E_6 II:
Supersymmetric Case | 27 pages, 2 figures; typos correted, version to be published in
Physical Review D | Phys.Rev.D71:113002,2005 | 10.1103/PhysRevD.71.113002 | CUMQ/HEP 133, WM-05-107 | hep-ph | null | We present a complete analysis of the neutral fermion sector of
supersymmetric E_6-inspired low energy models containing an extra SU(2),
concentrating on the Alternate Left-Right and Inert models. We show that the
R-parity conserving scenario always exhibits a large Dirac mass for \nu_L with
maximal mixing with an isosinglet neutrino, and that R-parity violating
scenarios do not change the picture other than allowing further mixing with
another isosinglet. In order to recover Standard Model phenomenology,
additional assumptions in the form of discrete symmetries and/or new
interactions are needed. We introduce and investigate Discrete Symmetry method
and Higher Dimensional Operators as mechanisms for solving the neutrino mass
and mixing problems in these models.
| [
{
"created": "Wed, 9 Mar 2005 16:39:12 GMT",
"version": "v1"
},
{
"created": "Mon, 16 May 2005 20:09:26 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"Frank",
"Mariana",
"",
"Concordia Univ."
],
[
"Turan",
"Ismail",
"",
"Concordia Univ."
],
[
"Sher",
"Marc",
"",
"William\n and Mary"
]
] | We present a complete analysis of the neutral fermion sector of supersymmetric E_6-inspired low energy models containing an extra SU(2), concentrating on the Alternate Left-Right and Inert models. We show that the R-parity conserving scenario always exhibits a large Dirac mass for \nu_L with maximal mixing with an isosinglet neutrino, and that R-parity violating scenarios do not change the picture other than allowing further mixing with another isosinglet. In order to recover Standard Model phenomenology, additional assumptions in the form of discrete symmetries and/or new interactions are needed. We introduce and investigate Discrete Symmetry method and Higher Dimensional Operators as mechanisms for solving the neutrino mass and mixing problems in these models. |
hep-ph/0502042 | Yoshiko Kanada-En'yo | Y. Kanada-En'yo, O. Morimatsu, and T. Nishikawa | Axial vector tetraquark with S=+2 | 20 pages, 5 figures, submitted to Phys.Rev.D | Phys.Rev.D71:094005,2005 | 10.1103/PhysRevD.71.094005 | null | hep-ph | null | Possibility of an axial vector isoscalar tetraquark with $ud\bar{s}\bar{s}$
is discussed. If the pentaquark $\Theta^+(1540)$ has the
$(qq)_{\bar{3}}(qq)_{\bar{3}}\bar{q}$ configuration, the isoscalar
$ud\bar{s}\bar{s}$($\vartheta^+$-meson) state with $J^P=1^+$ is expected to
exist in the mass region lower than or close to the mass of $\Theta^+(1540)$.
Within a flux-tube quark model, a possible resonant state of
$ud\bar{s}\bar{s}(J^{P}=1^{+})$ is suggested to appear around 1.4 GeV with the
width ${\cal{O}}(20\sim 50)$ MeV. We propose that the $\vartheta^+$-meson is a
good candidate for the tetraquark search, which would be observed in the
$K^+K^+\pi^-$ decay channel.
| [
{
"created": "Fri, 4 Feb 2005 00:52:22 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Aug 2005 06:27:37 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Kanada-En'yo",
"Y.",
""
],
[
"Morimatsu",
"O.",
""
],
[
"Nishikawa",
"T.",
""
]
] | Possibility of an axial vector isoscalar tetraquark with $ud\bar{s}\bar{s}$ is discussed. If the pentaquark $\Theta^+(1540)$ has the $(qq)_{\bar{3}}(qq)_{\bar{3}}\bar{q}$ configuration, the isoscalar $ud\bar{s}\bar{s}$($\vartheta^+$-meson) state with $J^P=1^+$ is expected to exist in the mass region lower than or close to the mass of $\Theta^+(1540)$. Within a flux-tube quark model, a possible resonant state of $ud\bar{s}\bar{s}(J^{P}=1^{+})$ is suggested to appear around 1.4 GeV with the width ${\cal{O}}(20\sim 50)$ MeV. We propose that the $\vartheta^+$-meson is a good candidate for the tetraquark search, which would be observed in the $K^+K^+\pi^-$ decay channel. |
1008.0202 | Yasemin Sarac | K. Azizi, M. Bayar, A. Ozpineci, Y. Sarac | The $g_{\Sigma_Q\Sigma_Q\pi}$ Coupling Constant via Light Cone QCD Sum
Rules | 9 pages, 4 figures | Phys.Rev.D82:076004,2010 | 10.1103/PhysRevD.82.076004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the most general form of the interpolating currents, the coupling
constants $g_{\Sigma_b\Sigma_b\pi}$ and $g_{\Sigma_c\Sigma_c\pi}$ are
calculated within the light cone QCD sum rules approach. It is found that
$g_{{\Sigma_{c}\Sigma_{c}\pi}}=-8.0\pm1.7$ and
$g_{{\Sigma_{b}\Sigma_{b}\pi}}=-11.0\pm2.1$.
| [
{
"created": "Sun, 1 Aug 2010 19:32:45 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Sep 2010 13:57:14 GMT",
"version": "v2"
}
] | 2014-11-21 | [
[
"Azizi",
"K.",
""
],
[
"Bayar",
"M.",
""
],
[
"Ozpineci",
"A.",
""
],
[
"Sarac",
"Y.",
""
]
] | Using the most general form of the interpolating currents, the coupling constants $g_{\Sigma_b\Sigma_b\pi}$ and $g_{\Sigma_c\Sigma_c\pi}$ are calculated within the light cone QCD sum rules approach. It is found that $g_{{\Sigma_{c}\Sigma_{c}\pi}}=-8.0\pm1.7$ and $g_{{\Sigma_{b}\Sigma_{b}\pi}}=-11.0\pm2.1$. |
hep-ph/0407138 | Ara Ioannisian Dr. | A. N. Ioannisian, N. A. Kazarian, A. Yu. Smirnov, D. Wyler | A precise analytical description of the Earth matter effect on
oscillations of low energy neutrinos | REVTeX 4, 6 pages, 1 figure, several clarifications added, typos
corrected | Phys.Rev. D71 (2005) 033006 | 10.1103/PhysRevD.71.033006 | null | hep-ph | null | We present a formalism for the matter effects in the Earth on low energy
neutrino fluxes which is both accurate and has all advantages of a full
analytic treatment. The oscillation probabilities are calculated up to second
order term in $\epsilon(x) \equiv 2V(x)E/\Delta m^2$ where $V(x)$ is the
neutrino potential at position $x$. We show the absence of large undamped
phases which makes the expansion in $\epsilon$ well behaved. An improved
expansion is presented in terms of the variation of $V(x)$ around a suitable
mean value which allows to treat energies up to those relevant for Supernova
neutrinos. We discuss also the case of three-neutrino mixing.
| [
{
"created": "Mon, 12 Jul 2004 17:07:10 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Oct 2004 17:27:24 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Ioannisian",
"A. N.",
""
],
[
"Kazarian",
"N. A.",
""
],
[
"Smirnov",
"A. Yu.",
""
],
[
"Wyler",
"D.",
""
]
] | We present a formalism for the matter effects in the Earth on low energy neutrino fluxes which is both accurate and has all advantages of a full analytic treatment. The oscillation probabilities are calculated up to second order term in $\epsilon(x) \equiv 2V(x)E/\Delta m^2$ where $V(x)$ is the neutrino potential at position $x$. We show the absence of large undamped phases which makes the expansion in $\epsilon$ well behaved. An improved expansion is presented in terms of the variation of $V(x)$ around a suitable mean value which allows to treat energies up to those relevant for Supernova neutrinos. We discuss also the case of three-neutrino mixing. |
hep-ph/0503024 | Wayne W. Repko | Alberto Devoto, Stefano Di Chiara and Wayne W. Repko | Noncommutative QED corrections to e^+e^-\to\gamma\gamma\gamma at linear
collider energies | version accepted by Physical Review | Phys.Rev.D72:056006,2005 | 10.1103/PhysRevD.72.056006 | null | hep-ph | null | We compute the total cross section as well as angular and energy
distributions for process $e^+e^-\to\gamma\gamma\gamma$ with both unpolarized
and polarized beams in the framework of noncommutative quantum electrodynamics
(NCQED). The calculation is performed in the center of mass of colliding
electron and positron and is evaluated for energies and integrated luminosities
appropriate to future linear colliders. We find that by using unpolarized beams
it is possible to probe the Lorentz symmetry violating azimuthal dependence of
the cross section. Furthermore, with polarized beams the left-right asymmetry
of the CP violating NCQED amplitudes can be used to obtain bounds on the
noncommutative scale $\Lambda_{NC}$ which exceed 1.0 TeV.
| [
{
"created": "Wed, 2 Mar 2005 15:51:40 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Mar 2005 19:28:35 GMT",
"version": "v2"
},
{
"created": "Fri, 9 Sep 2005 20:52:53 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Devoto",
"Alberto",
""
],
[
"Di Chiara",
"Stefano",
""
],
[
"Repko",
"Wayne W.",
""
]
] | We compute the total cross section as well as angular and energy distributions for process $e^+e^-\to\gamma\gamma\gamma$ with both unpolarized and polarized beams in the framework of noncommutative quantum electrodynamics (NCQED). The calculation is performed in the center of mass of colliding electron and positron and is evaluated for energies and integrated luminosities appropriate to future linear colliders. We find that by using unpolarized beams it is possible to probe the Lorentz symmetry violating azimuthal dependence of the cross section. Furthermore, with polarized beams the left-right asymmetry of the CP violating NCQED amplitudes can be used to obtain bounds on the noncommutative scale $\Lambda_{NC}$ which exceed 1.0 TeV. |
hep-ph/0405228 | Luis Roca | L. Roca, J. E. Palomar, E. Oset, H. C. Chiang | Unitary chiral dynamics in J/Psi to VPP decays and the role of scalar
mesons | 29 pages, 10 figures | Nucl.Phys. A744 (2004) 127-155 | 10.1016/j.nuclphysa.2004.08.004 | FTUV-04-0524, IFIC-04-0524 | hep-ph | null | We make a theoretical study of the J/Psi decays into \omega\pi\pi,
\phi\pi\pi, \omega K \bar{K} and \phi K\bar{K} using the techniques of the
chiral unitary approach stressing the important role of the scalar resonances
dynamically generated through the final state interaction of the two
pseudoscalar mesons. We also discuss the importance of new mechanisms with
intermediate exchange of vector and axial-vector mesons and the role played by
the OZI rule in the J/\Psi\phi\pi\pi vertex, quantifying its effects. The
results nicely reproduce the experimental data for the invariant mass
distributions in all the channels considered.
| [
{
"created": "Mon, 24 May 2004 10:50:56 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Roca",
"L.",
""
],
[
"Palomar",
"J. E.",
""
],
[
"Oset",
"E.",
""
],
[
"Chiang",
"H. C.",
""
]
] | We make a theoretical study of the J/Psi decays into \omega\pi\pi, \phi\pi\pi, \omega K \bar{K} and \phi K\bar{K} using the techniques of the chiral unitary approach stressing the important role of the scalar resonances dynamically generated through the final state interaction of the two pseudoscalar mesons. We also discuss the importance of new mechanisms with intermediate exchange of vector and axial-vector mesons and the role played by the OZI rule in the J/\Psi\phi\pi\pi vertex, quantifying its effects. The results nicely reproduce the experimental data for the invariant mass distributions in all the channels considered. |
2407.17270 | Hrachya Asatyan | Christoph Greub, Hrachia M. Asatrian, Hrachya H. Asatryan, Lukas Born
and Julian Eicher | Three-loop contributions to $b\to s\gamma$ associated with the
current-current operators | 18 pages, 7 figures, 2 tables, 1 ancillary file. arXiv admin note:
text overlap with arXiv:2303.01714 | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In a recent work, we calculated all three-loop diagrams contributing to the
decay amplitude for $b \to s \gamma$ where none of the gluons touch the
$b$-leg. In the present paper, we complete the calculation by working out all
remaining three-loop diagrams (of order $\alpha_s^2$) associated with the
current-current operators $O_1$ and $O_2$ at the physical value of the
charm-quark mass $m_c$. Using the programs AMFlow and DiffExp to solve the
differential equations for the master integrals, we obtained precise numerical
results at 23 values for $z=m_c^2/m_b^2$, ranging from $z=1/1000$ to $z=1/5$,
along with asymptotic expansions around $z=0$. For certain diagrams, the
asymptotic expansion breaks down in the physical $z$-range, necessitating a
Taylor expansion (which we do around $z=1/10$). In all expansions, we retained
power terms up to $z^{20}$ and included the accompanying $\log(z)$ terms to all
powers for asymptotic expansions. Numerical results for the sum of all diagrams
(including those calculated in the previous paper) are presented in tabular
form, while the mentioned expansions of individual diagram classes are provided
electronically. We note that our results for the asymptotic expansions around
$z=0$ are in good agreement with those recently published by Fael et al. and
Czaja et al..
| [
{
"created": "Wed, 24 Jul 2024 13:36:28 GMT",
"version": "v1"
}
] | 2024-07-25 | [
[
"Greub",
"Christoph",
""
],
[
"Asatrian",
"Hrachia M.",
""
],
[
"Asatryan",
"Hrachya H.",
""
],
[
"Born",
"Lukas",
""
],
[
"Eicher",
"Julian",
""
]
] | In a recent work, we calculated all three-loop diagrams contributing to the decay amplitude for $b \to s \gamma$ where none of the gluons touch the $b$-leg. In the present paper, we complete the calculation by working out all remaining three-loop diagrams (of order $\alpha_s^2$) associated with the current-current operators $O_1$ and $O_2$ at the physical value of the charm-quark mass $m_c$. Using the programs AMFlow and DiffExp to solve the differential equations for the master integrals, we obtained precise numerical results at 23 values for $z=m_c^2/m_b^2$, ranging from $z=1/1000$ to $z=1/5$, along with asymptotic expansions around $z=0$. For certain diagrams, the asymptotic expansion breaks down in the physical $z$-range, necessitating a Taylor expansion (which we do around $z=1/10$). In all expansions, we retained power terms up to $z^{20}$ and included the accompanying $\log(z)$ terms to all powers for asymptotic expansions. Numerical results for the sum of all diagrams (including those calculated in the previous paper) are presented in tabular form, while the mentioned expansions of individual diagram classes are provided electronically. We note that our results for the asymptotic expansions around $z=0$ are in good agreement with those recently published by Fael et al. and Czaja et al.. |
1911.10025 | Daniele Marangotto | Daniele Marangotto | Helicity amplitudes for generic multi-body particle decays featuring
multiple decay chains | null | Advances in High Energy Physics (2020) 6674595 | 10.1155/2020/6674595 | null | hep-ph | http://creativecommons.org/licenses/by-sa/4.0/ | We present the general expression of helicity amplitudes for generic
multi-body particle decays characterised by multiple decay chains. This is
achieved by addressing for the first time the issue of the matching of final
particle spin states among different decay chains in full generality for
generic multi-body decays, proposing a method able to match the exact
definition of spin states relative to the decaying particle ones. We stress the
importance of our result by showing that one of the matching method used in the
literature is incorrect, leading to amplitude models violating rotational
invariance. The results presented are therefore relevant for performing
numerous amplitude analysis, notably those searching for exotic structures like
pentaquarks.
| [
{
"created": "Fri, 22 Nov 2019 13:18:20 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Feb 2020 19:21:43 GMT",
"version": "v2"
},
{
"created": "Tue, 9 Jun 2020 06:40:59 GMT",
"version": "v3"
},
{
"created": "Sat, 28 Nov 2020 10:27:49 GMT",
"version": "v4"
}
] | 2022-09-30 | [
[
"Marangotto",
"Daniele",
""
]
] | We present the general expression of helicity amplitudes for generic multi-body particle decays characterised by multiple decay chains. This is achieved by addressing for the first time the issue of the matching of final particle spin states among different decay chains in full generality for generic multi-body decays, proposing a method able to match the exact definition of spin states relative to the decaying particle ones. We stress the importance of our result by showing that one of the matching method used in the literature is incorrect, leading to amplitude models violating rotational invariance. The results presented are therefore relevant for performing numerous amplitude analysis, notably those searching for exotic structures like pentaquarks. |
hep-ph/0506332 | Olga Shekhovtsova | G. Pancheri, O. Shekhovtsova, G. Venanzoni | Test of FSR in the process $e^+e^-\to\pi^+\pi^-\gamma$ at DA$\Phi$NE | 7 pages, 4 figures, talk at EURIDICE Midterm Collaboration Meeting,
Frascati, 8-12 February | null | null | null | hep-ph | null | In this paper we consider the possibility to test the FSR model in the
reaction $e^+e^-\to\pi^+\pi^-\gamma$ at DA$\Phi$NE. We propose to consider the
low $Q^2$ region ($Q^2$ is the invariant mass squared of the di-pion system) to
study the different models describing $gamma^*\to\pi^+\pi^-\gamma$ interaction.
As illustration we compare the scalar QED and Resonance Perturbation Theory
prediction for the $e^+e^-\to\pi^+\pi^-\gamma$ cross section. We also consider
the contribution coming from the $\phi$ direct decay
($\phi\to\pi^+\pi^-\gamma$). We find the low $Q^2$ region is sensitive to FSR
models.
| [
{
"created": "Thu, 30 Jun 2005 15:52:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pancheri",
"G.",
""
],
[
"Shekhovtsova",
"O.",
""
],
[
"Venanzoni",
"G.",
""
]
] | In this paper we consider the possibility to test the FSR model in the reaction $e^+e^-\to\pi^+\pi^-\gamma$ at DA$\Phi$NE. We propose to consider the low $Q^2$ region ($Q^2$ is the invariant mass squared of the di-pion system) to study the different models describing $gamma^*\to\pi^+\pi^-\gamma$ interaction. As illustration we compare the scalar QED and Resonance Perturbation Theory prediction for the $e^+e^-\to\pi^+\pi^-\gamma$ cross section. We also consider the contribution coming from the $\phi$ direct decay ($\phi\to\pi^+\pi^-\gamma$). We find the low $Q^2$ region is sensitive to FSR models. |
hep-ph/0512320 | Danny Marfatia | V. Barger, E. Guarnaccia, D Marfatia | Classification of dark energy models in the (w_0,w_a) plane | 11 pages, 3 figures. Classification generalized to include models for
which the equation of state crosses the phantom divide line. Published
version | Phys.Lett.B635:61-65,2006 | 10.1016/j.physletb.2006.02.018 | null | hep-ph astro-ph gr-qc hep-th | null | We classify dark energy models in a plane of observables that correspond to
the common parameterization of a non-constant equation of state, w(a)=w_0 +
w_a(1-a), where $a$ is the scale factor of the universe. The models fall into
four classes and only two of these classes have a region of overlap in the
observable plane. We perform a joint analysis of all Type Ia supernova (SNIa)
data compiled by the High-Z SN Search Team (HZT) and the Supernova Legacy
Survey (SNLS) and find that no class of models is excluded by current SNIa
data. However, an analysis of large scale structure, Ly$\alpha$ forest and bias
constraints from SDSS, the Gold SNIa data and WMAP data indicates that
non-phantom barotropic models with a a positive sound speed are excluded at the
95% C.L.
| [
{
"created": "Mon, 26 Dec 2005 20:02:06 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Feb 2006 23:43:15 GMT",
"version": "v2"
},
{
"created": "Fri, 10 Mar 2006 21:40:01 GMT",
"version": "v3"
}
] | 2009-09-15 | [
[
"Barger",
"V.",
""
],
[
"Guarnaccia",
"E.",
""
],
[
"Marfatia",
"D",
""
]
] | We classify dark energy models in a plane of observables that correspond to the common parameterization of a non-constant equation of state, w(a)=w_0 + w_a(1-a), where $a$ is the scale factor of the universe. The models fall into four classes and only two of these classes have a region of overlap in the observable plane. We perform a joint analysis of all Type Ia supernova (SNIa) data compiled by the High-Z SN Search Team (HZT) and the Supernova Legacy Survey (SNLS) and find that no class of models is excluded by current SNIa data. However, an analysis of large scale structure, Ly$\alpha$ forest and bias constraints from SDSS, the Gold SNIa data and WMAP data indicates that non-phantom barotropic models with a a positive sound speed are excluded at the 95% C.L. |
hep-ph/0309228 | Michael R. Pennington | M.R. Pennington | In the debris of hadron interactions lies the beauty of QCD | Presented at the Workshop on Gluonic Excitations, Thomas Jefferson
National Accelerator Laboratory, Newport News, May 2003 | null | null | DCPT/03/98, IPPP/03/49 | hep-ph | null | Recent progress in understanding the strong physics regime of QCD is
described. The role played by condensates, particularly $q{\bar q}$, in
breaking chiral symmetry and generating constituent masses for $u$ and $d$
quarks is reviewed. The influence this has on hadrons with vacuum quantum
numbers is emphasised. What we know of this sector from recent data on
$\phi$-radiative decays and from $D$ decays to light hadrons is discussed. The
key to further understanding is comprehensive analyses of such data, including
that planned for Hall D at Jefferson Laboratory.
| [
{
"created": "Fri, 19 Sep 2003 09:23:59 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pennington",
"M. R.",
""
]
] | Recent progress in understanding the strong physics regime of QCD is described. The role played by condensates, particularly $q{\bar q}$, in breaking chiral symmetry and generating constituent masses for $u$ and $d$ quarks is reviewed. The influence this has on hadrons with vacuum quantum numbers is emphasised. What we know of this sector from recent data on $\phi$-radiative decays and from $D$ decays to light hadrons is discussed. The key to further understanding is comprehensive analyses of such data, including that planned for Hall D at Jefferson Laboratory. |
1908.02406 | Yongseok Oh | Parada T. P. Hutauruk, J. J. Cobos-Martinez, Yongseok Oh, K. Tsushima | Valence-quark distributions of pions and kaons in a nuclear medium | 12 pages, REVTeX | Phys. Rev. D 100, 094011 (2019) | 10.1103/PhysRevD.100.094011 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In-medium valence-quark distributions of $\pi^+$ and $K^+$ mesons in
symmetric nuclear matter are studied by combining the Nambu--Jona-Lasinio model
and the quark-meson coupling model. The in-medium properties of the current
quarks, which are used as inputs for studying the in-medium pion and kaon
properties in the Nambu--Jona-Lasinio model, are calculated within the
quark-meson coupling model. The light-quark condensates, light-quark dynamical
masses, pion and kaon decay constants, and pion- and kaon-quark coupling
constants are found to decrease as nuclear density increases. The obtained
valence quark distributions in vacuum for both the $\pi^+$ and $K^+$ could
reasonably describe the available experimental data over a wide range of
Bjorken-$x$. The in-medium valence $u$-quark distribution in the $\pi^+$ at
$Q^2=16~\mbox{GeV}^2$ is found to be almost unchanged compared to the in-vacuum
case. However, the in-medium to in-vacuum ratios of both the valence $u$-quark
and valence $s$-quark distributions of the $K^+$ meson at $Q^2=16~\mbox{GeV}^2$
increase with nuclear matter density, but show different $x$-dependence.
Namely, the ratio for the valence $u$-quark distribution increases with $x$,
while that for the valence $s$ quark decreases with $x$. These features are
enhanced at higher density regions.
| [
{
"created": "Wed, 7 Aug 2019 00:18:43 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Nov 2019 23:00:43 GMT",
"version": "v2"
}
] | 2019-11-20 | [
[
"Hutauruk",
"Parada T. P.",
""
],
[
"Cobos-Martinez",
"J. J.",
""
],
[
"Oh",
"Yongseok",
""
],
[
"Tsushima",
"K.",
""
]
] | In-medium valence-quark distributions of $\pi^+$ and $K^+$ mesons in symmetric nuclear matter are studied by combining the Nambu--Jona-Lasinio model and the quark-meson coupling model. The in-medium properties of the current quarks, which are used as inputs for studying the in-medium pion and kaon properties in the Nambu--Jona-Lasinio model, are calculated within the quark-meson coupling model. The light-quark condensates, light-quark dynamical masses, pion and kaon decay constants, and pion- and kaon-quark coupling constants are found to decrease as nuclear density increases. The obtained valence quark distributions in vacuum for both the $\pi^+$ and $K^+$ could reasonably describe the available experimental data over a wide range of Bjorken-$x$. The in-medium valence $u$-quark distribution in the $\pi^+$ at $Q^2=16~\mbox{GeV}^2$ is found to be almost unchanged compared to the in-vacuum case. However, the in-medium to in-vacuum ratios of both the valence $u$-quark and valence $s$-quark distributions of the $K^+$ meson at $Q^2=16~\mbox{GeV}^2$ increase with nuclear matter density, but show different $x$-dependence. Namely, the ratio for the valence $u$-quark distribution increases with $x$, while that for the valence $s$ quark decreases with $x$. These features are enhanced at higher density regions. |
hep-ph/0510295 | Dorota Kotlorz | D. Kotlorz, A. Kotlorz | DGLAP evolution of truncated moments of parton densities within two
different approaches | 17 pages, 6 figures | Acta Phys.Polon.B36:3023,2005 | null | null | hep-ph | null | We solve the LO DGLAP QCD evolution equation for truncated Mellin moments of
the nucleon nonsinglet structure function. The results are compared with those,
obtained in the Chebyshev-polynomial approach for $x$-space solutions.
Computations are performed for a wide range of the truncation point
$10^{-5}\leq x_0\leq 0.9$ and $1\leq Q^2\leq 100 {\rm GeV}^2$. The agreement is
perfect for higher moments ($n\geq 2$) and not too large $x_0$ ($x_0\leq 0.1$),
even for a small number of terms in the truncated series (M=4). The accuracy of
the truncated moments method increases for larger $M$ and decreases very slowly
with increasing $Q^2$. For M=30 the relative error in a case of the first
moment at $x_0\leq 0.1$ and $Q^2=10 {\rm GeV}^2$ doesn't exceed 5%
independently on the shape of the input parametrisation. This is a quite
satisfactory result. Using the truncated moments approach one can avoid
uncertainties from the unmeasurable $x\to 0$ region and also study scaling
violations without making any assumption on the shape of input parametrisation
of parton distributions. Therefore the method of truncated moments seems to be
a useful tool in further QCD analyses.
| [
{
"created": "Fri, 21 Oct 2005 20:28:13 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Kotlorz",
"D.",
""
],
[
"Kotlorz",
"A.",
""
]
] | We solve the LO DGLAP QCD evolution equation for truncated Mellin moments of the nucleon nonsinglet structure function. The results are compared with those, obtained in the Chebyshev-polynomial approach for $x$-space solutions. Computations are performed for a wide range of the truncation point $10^{-5}\leq x_0\leq 0.9$ and $1\leq Q^2\leq 100 {\rm GeV}^2$. The agreement is perfect for higher moments ($n\geq 2$) and not too large $x_0$ ($x_0\leq 0.1$), even for a small number of terms in the truncated series (M=4). The accuracy of the truncated moments method increases for larger $M$ and decreases very slowly with increasing $Q^2$. For M=30 the relative error in a case of the first moment at $x_0\leq 0.1$ and $Q^2=10 {\rm GeV}^2$ doesn't exceed 5% independently on the shape of the input parametrisation. This is a quite satisfactory result. Using the truncated moments approach one can avoid uncertainties from the unmeasurable $x\to 0$ region and also study scaling violations without making any assumption on the shape of input parametrisation of parton distributions. Therefore the method of truncated moments seems to be a useful tool in further QCD analyses. |
2011.13159 | Howard E. Haber | Patrick Draper, Andreas Ekstedt, Howard E. Haber | A natural mechanism for approximate Higgs alignment in the 2HDM | 55 pages, 8 figures, 3 tables, and 3 appendices; version 2 adds
references, corrects typographical errors and adds one figure; version 3
updates references | Journal of High Energy Physics 05 (2021) 235 | 10.1007/JHEP05(2021)235 | SCIPP-20/03 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The 2HDM possesses a neutral scalar interaction eigenstate whose tree-level
properties coincide with the Standard Model (SM) Higgs boson. In light of the
LHC Higgs data which suggests that the observed Higgs boson is SM-like, it
follows that the mixing of the SM Higgs interaction eigenstate with the other
neutral scalar interaction eigenstates of the 2HDM should be suppressed,
corresponding to the so-called Higgs alignment limit. The exact Higgs alignment
limit can arise naturally due to a global symmetry of the scalar potential. If
this symmetry is softly broken, then the Higgs alignment limit becomes
approximate (although still potentially consistent with the current LHC Higgs
data). In this paper, we obtain the approximate Higgs alignment suggested by
the LHC Higgs data as a consequence of a softly broken global symmetry of the
Higgs Lagrangian. However, this can only be accomplished if the Yukawa sector
of the theory is extended. We propose an extended 2HDM with vector-like top
quark partners, where explicit mass terms in the top sector provide the source
of the soft symmetry breaking of a generalized CP symmetry. In this way, we can
realize approximate Higgs alignment without a significant fine-tuning of the
model parameters. We then explore the implications of the current LHC bounds on
vector-like top quark partners for the success of our proposed scenario.
| [
{
"created": "Thu, 26 Nov 2020 07:06:11 GMT",
"version": "v1"
},
{
"created": "Fri, 7 May 2021 05:47:44 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Jun 2021 07:40:48 GMT",
"version": "v3"
}
] | 2021-06-15 | [
[
"Draper",
"Patrick",
""
],
[
"Ekstedt",
"Andreas",
""
],
[
"Haber",
"Howard E.",
""
]
] | The 2HDM possesses a neutral scalar interaction eigenstate whose tree-level properties coincide with the Standard Model (SM) Higgs boson. In light of the LHC Higgs data which suggests that the observed Higgs boson is SM-like, it follows that the mixing of the SM Higgs interaction eigenstate with the other neutral scalar interaction eigenstates of the 2HDM should be suppressed, corresponding to the so-called Higgs alignment limit. The exact Higgs alignment limit can arise naturally due to a global symmetry of the scalar potential. If this symmetry is softly broken, then the Higgs alignment limit becomes approximate (although still potentially consistent with the current LHC Higgs data). In this paper, we obtain the approximate Higgs alignment suggested by the LHC Higgs data as a consequence of a softly broken global symmetry of the Higgs Lagrangian. However, this can only be accomplished if the Yukawa sector of the theory is extended. We propose an extended 2HDM with vector-like top quark partners, where explicit mass terms in the top sector provide the source of the soft symmetry breaking of a generalized CP symmetry. In this way, we can realize approximate Higgs alignment without a significant fine-tuning of the model parameters. We then explore the implications of the current LHC bounds on vector-like top quark partners for the success of our proposed scenario. |
0705.0101 | Qiang Zhao | Qiang Zhao | \chi_{c0,2} decay into light meson pairs and its implication of the
scalar meson structures | Minor modifications; Revised version accepted by Phys. Lett. B | Phys.Lett.B659:221-227,2008 | 10.1016/j.physletb.2007.10.062 | null | hep-ph hep-ex | null | In light of the recent data from BES collaboration for $\chi_{c0}\to VV$,
$PP$ and $SS$, and from CLEO-c for $\eta\eta$, $\eta^\prime\eta^\prime$ and
$\eta\eta^\prime$, we present a detailed analysis of the decays of heavy
quarkonia into light meson pairs such as $\chi_{c0,2}\to VV$, $PP$ and $SS$ in
a recently proposed parametrization scheme. An overall agreement with the data
is achieved in $\chi_{c0,2}\to VV$ and $PP$, while in $\chi_{c0}\to SS$ we find
that a possible existence of glueball-$q\bar{q}$ mixings is correlated with the
OZI-rule violations, which can be further examined at CLEO-c and BESIII in
$\chi_{c0}\to SS$ measurement.
| [
{
"created": "Tue, 1 May 2007 12:26:15 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Oct 2007 00:55:25 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Zhao",
"Qiang",
""
]
] | In light of the recent data from BES collaboration for $\chi_{c0}\to VV$, $PP$ and $SS$, and from CLEO-c for $\eta\eta$, $\eta^\prime\eta^\prime$ and $\eta\eta^\prime$, we present a detailed analysis of the decays of heavy quarkonia into light meson pairs such as $\chi_{c0,2}\to VV$, $PP$ and $SS$ in a recently proposed parametrization scheme. An overall agreement with the data is achieved in $\chi_{c0,2}\to VV$ and $PP$, while in $\chi_{c0}\to SS$ we find that a possible existence of glueball-$q\bar{q}$ mixings is correlated with the OZI-rule violations, which can be further examined at CLEO-c and BESIII in $\chi_{c0}\to SS$ measurement. |
hep-ph/0211242 | David Rayner | S. F. King and D. A. J. Rayner | Twisted Moduli and Supersymmetry Breaking | 5 pages, 2 eps figures, ws-procs9x6.cls included. Based on a talk
given by D.R. at 1st International Conference on String Phenomenology,
Oxford, England, 6-11 Jul 2002 | null | 10.1142/9789812704917_0049 | SHEP 02-32 | hep-ph | null | We discuss how localized twisted moduli in type I string theory can provide a
string realization of brane world supersymmetry breaking models.
| [
{
"created": "Fri, 15 Nov 2002 09:27:20 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"King",
"S. F.",
""
],
[
"Rayner",
"D. A. J.",
""
]
] | We discuss how localized twisted moduli in type I string theory can provide a string realization of brane world supersymmetry breaking models. |
2003.13945 | Kentaro Nishimura | Kentaro Nishimura and Naoki Yamamoto | Topological term, QCD anomaly, and the eta' chiral soliton lattice in
rotating baryonic matter | 24 pages, 2 figures; v2: published version | JHEP 07 (2020) 196 | 10.1007/JHEP07(2020)196 | null | hep-ph cond-mat.mes-hall hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the ground states of low-density hadronic matter and high-density
color-flavor locked color superconducting phase in three-flavor QCD at finite
baryon chemical potential under rotation. We find that, in both cases under
sufficiently fast rotation, the combination of the rotation-induced topological
term for the eta' meson and the QCD anomaly leads to an inhomogeneous
condensate of the eta' meson, known as the chiral soliton lattice (CSL). We
find that, when baryon chemical potential is much larger than isospin chemical
potential, the critical angular velocity for the realization of the eta' CSL is
much smaller than that for the pi_0 CSL found previously. We also argue that
the eta' CSL states in flavor-symmetric QCD at low density and high density
should be continuously connected, extending the quark-hadron continuity
conjecture in the presence of the rotation.
| [
{
"created": "Tue, 31 Mar 2020 04:06:34 GMT",
"version": "v1"
},
{
"created": "Sat, 1 Aug 2020 06:34:21 GMT",
"version": "v2"
}
] | 2020-08-04 | [
[
"Nishimura",
"Kentaro",
""
],
[
"Yamamoto",
"Naoki",
""
]
] | We study the ground states of low-density hadronic matter and high-density color-flavor locked color superconducting phase in three-flavor QCD at finite baryon chemical potential under rotation. We find that, in both cases under sufficiently fast rotation, the combination of the rotation-induced topological term for the eta' meson and the QCD anomaly leads to an inhomogeneous condensate of the eta' meson, known as the chiral soliton lattice (CSL). We find that, when baryon chemical potential is much larger than isospin chemical potential, the critical angular velocity for the realization of the eta' CSL is much smaller than that for the pi_0 CSL found previously. We also argue that the eta' CSL states in flavor-symmetric QCD at low density and high density should be continuously connected, extending the quark-hadron continuity conjecture in the presence of the rotation. |
hep-ph/0002081 | Csaba Boros | C. Boros, J.T. Londergan and A.W. Thomas | Lambda Polarization in Polarized Proton-Proton Collisions at RHIC | 18 pages, 5 figures | Phys.Rev.D62:014021,2000 | 10.1103/PhysRevD.62.014021 | ADP-99-53/T389 and IU/NTC 00-02 | hep-ph | null | We discuss Lambda polarization in semi-inclusive proton-proton collisions,
with one of the protons longitudinally polarized. The hyperfine interaction
responsible for the $\Delta$-$N$ and $\Sigma$-$\Lambda$ mass splittings gives
rise to flavor asymmetric fragmentation functions and to sizable polarized
non-strange fragmentation functions. We predict large positive Lambda
polarization in polarized proton-proton collisions at large rapidities of the
produced Lambda, while other models, based on SU(3) flavor symmetric
fragmentation functions, predict zero or negative Lambda polarization. The
effect of $\Sigma^0$ and $\Sigma^*$ decays is also discussed. Forthcoming
experiments at RHIC will be able to differentiate between these predictions.
| [
{
"created": "Tue, 8 Feb 2000 05:29:05 GMT",
"version": "v1"
}
] | 2010-02-17 | [
[
"Boros",
"C.",
""
],
[
"Londergan",
"J. T.",
""
],
[
"Thomas",
"A. W.",
""
]
] | We discuss Lambda polarization in semi-inclusive proton-proton collisions, with one of the protons longitudinally polarized. The hyperfine interaction responsible for the $\Delta$-$N$ and $\Sigma$-$\Lambda$ mass splittings gives rise to flavor asymmetric fragmentation functions and to sizable polarized non-strange fragmentation functions. We predict large positive Lambda polarization in polarized proton-proton collisions at large rapidities of the produced Lambda, while other models, based on SU(3) flavor symmetric fragmentation functions, predict zero or negative Lambda polarization. The effect of $\Sigma^0$ and $\Sigma^*$ decays is also discussed. Forthcoming experiments at RHIC will be able to differentiate between these predictions. |
2209.04134 | Surabhi Gupta | Surabhi Gupta, Sudhir Kumar Gupta and Keven Ren | Higgs boson in a flavor-extension of the CMSSM | 17 pages, 7 figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Flavour-violating couplings of Higgs boson with stop and scharm quarks could
be very important as in addition to lifting the mass of the Higgs boson by a
few GeV, it could also play a vital phenomenological role in reducing the
Supersymmetry breaking scale significantly. In this work, we investigate
effects of such flavour-violating couplings within the Constrained Minimal
Supersymmetric Standard Model (CMSSM) framework in the context of LEP data,
Higgs data at the LHC, precision observables and the relic density of the dark
matter using Bayesian statistics. Our detailed analysis reveals that the most
probable values of $m_{0}$, $m_{1/2}$, $A_{0}$, $\tan{\beta}$,
$\delta^{LR}_{ct}$ are expected to be around 4.83 TeV, 2.54 TeV, 1.90 TeV,
41.5, and 6.1$\times10^{-2}$, respectively, with flat priors. The corresponding
values translate into 3.25 TeV, 2.13 TeV, 1.90 TeV, 44.7, and
5.9$\times10^{-2}$, respectively, if the natural priors are used. Furthermore,
a comparison of our model with the CMSSM of flavour-conservation as the base
model yields a Bayes factor of about 6 while taking into account all the
experimental constraints used in our study. Our analysis also reflects that the
lightest neutralino would have a mass of about 1 TeV.
| [
{
"created": "Fri, 9 Sep 2022 06:16:21 GMT",
"version": "v1"
}
] | 2022-09-12 | [
[
"Gupta",
"Surabhi",
""
],
[
"Gupta",
"Sudhir Kumar",
""
],
[
"Ren",
"Keven",
""
]
] | Flavour-violating couplings of Higgs boson with stop and scharm quarks could be very important as in addition to lifting the mass of the Higgs boson by a few GeV, it could also play a vital phenomenological role in reducing the Supersymmetry breaking scale significantly. In this work, we investigate effects of such flavour-violating couplings within the Constrained Minimal Supersymmetric Standard Model (CMSSM) framework in the context of LEP data, Higgs data at the LHC, precision observables and the relic density of the dark matter using Bayesian statistics. Our detailed analysis reveals that the most probable values of $m_{0}$, $m_{1/2}$, $A_{0}$, $\tan{\beta}$, $\delta^{LR}_{ct}$ are expected to be around 4.83 TeV, 2.54 TeV, 1.90 TeV, 41.5, and 6.1$\times10^{-2}$, respectively, with flat priors. The corresponding values translate into 3.25 TeV, 2.13 TeV, 1.90 TeV, 44.7, and 5.9$\times10^{-2}$, respectively, if the natural priors are used. Furthermore, a comparison of our model with the CMSSM of flavour-conservation as the base model yields a Bayes factor of about 6 while taking into account all the experimental constraints used in our study. Our analysis also reflects that the lightest neutralino would have a mass of about 1 TeV. |
hep-ph/9309317 | John Collins | John C. Collins | Physics of Polarized pp Collisions | Talk presented at PANIC XIII--Particles and Nuclei International
Conference at Perugia, Italy 28 June -- 2 July 1993. 4 pages, LaTeX. | null | null | PSU/TH/132 | hep-ph | null | I will summarize the physics that can be investigated with polarized pp
collisions. It is technically feasible to use the RHIC collider for
accelerating highly polarized protons to a center-of-mass energy of about 400
GeV, with high luminosity. Such collisions can be used to probe the
spin-dependence of hard collisions and of partons in a hadron, including the
gluons. There are interesting twist 3 phenomena that are likely to be
significant in view of the large transverse spin asymmetries at lower energies;
this will have important implications for the spin structure of the proton wave
function. Recent theoretical developments include the possibility of probing
the spin of transversely polarized quarks via asymmetries in the jets they
make.
| [
{
"created": "Thu, 23 Sep 1993 20:20:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Collins",
"John C.",
""
]
] | I will summarize the physics that can be investigated with polarized pp collisions. It is technically feasible to use the RHIC collider for accelerating highly polarized protons to a center-of-mass energy of about 400 GeV, with high luminosity. Such collisions can be used to probe the spin-dependence of hard collisions and of partons in a hadron, including the gluons. There are interesting twist 3 phenomena that are likely to be significant in view of the large transverse spin asymmetries at lower energies; this will have important implications for the spin structure of the proton wave function. Recent theoretical developments include the possibility of probing the spin of transversely polarized quarks via asymmetries in the jets they make. |
1610.06719 | Yueling Yang | Junfeng Sun, Lili Chen, Na Wang, Qin Chang, Jinshu Huang, Yueling Yang | Study on the ${\Upsilon}(1S)$ ${\to}$ $B_{c}M$ weak decays | 15 pages, revtex | Advances in High Energy Physisc, 2015, 691261 (2015) | 10.1155/2015/691261 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Motivated by the prospects of the potential ${\Upsilon}(1S)$ particle at
high-luminosity heavy-flavor experiments, we studied the ${\Upsilon}(1S)$
${\to}$ $B_{c}M$ weak decays, where $M$ $=$ ${\pi}$, ${\rho}$, $K^{(\ast)}$.
The nonfactorizable contributions to hadronic matrix elements are taken into
consideration with the QCDF approach. It is found that the CKM-favored
${\Upsilon}(1S)$ ${\to}$ $B_{c}{\rho}$ decay has branching ratio of ${\cal
O}(10^{-10})$, which might be measured promisingly by the future experiments.
| [
{
"created": "Fri, 21 Oct 2016 09:33:27 GMT",
"version": "v1"
}
] | 2016-10-24 | [
[
"Sun",
"Junfeng",
""
],
[
"Chen",
"Lili",
""
],
[
"Wang",
"Na",
""
],
[
"Chang",
"Qin",
""
],
[
"Huang",
"Jinshu",
""
],
[
"Yang",
"Yueling",
""
]
] | Motivated by the prospects of the potential ${\Upsilon}(1S)$ particle at high-luminosity heavy-flavor experiments, we studied the ${\Upsilon}(1S)$ ${\to}$ $B_{c}M$ weak decays, where $M$ $=$ ${\pi}$, ${\rho}$, $K^{(\ast)}$. The nonfactorizable contributions to hadronic matrix elements are taken into consideration with the QCDF approach. It is found that the CKM-favored ${\Upsilon}(1S)$ ${\to}$ $B_{c}{\rho}$ decay has branching ratio of ${\cal O}(10^{-10})$, which might be measured promisingly by the future experiments. |
hep-ph/0508200 | Richard Luddy | M. M. Islam, R. J. Luddy, A. V. Prokudin | Near Forward pp Elastic Scattering at LHC and Nucleon Structure | 49 pages including 17 figures. Submitted to Int. J. Mod. Phys. A | Int.J.Mod.Phys.A21:1-42,2006 | 10.1142/S0217751X06028473 | null | hep-ph | null | High energy proton-proton and antiproton-proton elastic scattering are
studied first in a model where the nucleon has an outer cloud and an inner
core. Elastic scattering is viewed as due to two processes: a) diffraction
scattering originating from cloud-cloud interaction; b) a hard or large |t|
scattering originating from one nucleon core scattering off the other via
vector meson omega exchange, while their outer clouds interact independently.
The omega-exchange amplitude shows that omega behaves like an elementary vector
meson at high energy, contrary to a regge pole behavior. This behavior,
however, can be understood in the nonlinear sigma-model where omega couples to
a topological baryonic current like a gauge boson, and the nucleon is described
as a topological soliton. Further investigation shows that the underlying
effective field theory model is a gauged linear sigma-model that has not only
the pion sector and the Wess-Zumino-Witten action of the nonlinear sigma-model,
but also a quark-scalar sector. The nucleon structure that emerges is that the
nucleon has an outer cloud of quark-antiquark condensed ground state, an inner
core of topological baryonic charge probed by omega, and a still smaller
quark-bag containing massless valence quarks. Large |t| pp elastic scattering
is attributed to valence quark-quark elastic scattering, which is taken to be
due to the hard pomeron. The model is applied to predict pp elastic
differential cross section at LHC at c.m. energy 14 TeV and |t| = 0 - 10 GeV*2.
If our predicted differential cross section is quantitatively confirmed by
precise measurement at LHC by the TOTEM group, then it will indicate that
various novel ideas developed over the last four decades to describe the
nucleon combine and lead to a unique physical description of its structure.
| [
{
"created": "Thu, 18 Aug 2005 19:44:25 GMT",
"version": "v1"
}
] | 2011-01-27 | [
[
"Islam",
"M. M.",
""
],
[
"Luddy",
"R. J.",
""
],
[
"Prokudin",
"A. V.",
""
]
] | High energy proton-proton and antiproton-proton elastic scattering are studied first in a model where the nucleon has an outer cloud and an inner core. Elastic scattering is viewed as due to two processes: a) diffraction scattering originating from cloud-cloud interaction; b) a hard or large |t| scattering originating from one nucleon core scattering off the other via vector meson omega exchange, while their outer clouds interact independently. The omega-exchange amplitude shows that omega behaves like an elementary vector meson at high energy, contrary to a regge pole behavior. This behavior, however, can be understood in the nonlinear sigma-model where omega couples to a topological baryonic current like a gauge boson, and the nucleon is described as a topological soliton. Further investigation shows that the underlying effective field theory model is a gauged linear sigma-model that has not only the pion sector and the Wess-Zumino-Witten action of the nonlinear sigma-model, but also a quark-scalar sector. The nucleon structure that emerges is that the nucleon has an outer cloud of quark-antiquark condensed ground state, an inner core of topological baryonic charge probed by omega, and a still smaller quark-bag containing massless valence quarks. Large |t| pp elastic scattering is attributed to valence quark-quark elastic scattering, which is taken to be due to the hard pomeron. The model is applied to predict pp elastic differential cross section at LHC at c.m. energy 14 TeV and |t| = 0 - 10 GeV*2. If our predicted differential cross section is quantitatively confirmed by precise measurement at LHC by the TOTEM group, then it will indicate that various novel ideas developed over the last four decades to describe the nucleon combine and lead to a unique physical description of its structure. |
hep-ph/0104007 | Hoang Ngoc Long | Hoang Ngoc Long, Le Phuoc Trung, Vo Thanh Van | Rare Kaon Decay K^+ --> \pi^+ \nu \bar{\nu} in SU(3)_C X SU(3)_L X
U(1)_N Models | 7 pages, 1 figure, latex | J.Exp.Theor.Phys.92:548-551,2001;
Zh.Eksp.Teor.Fiz.119:633-637,2001 | 10.1134/1.1371337 | APCTP-2000-004 | hep-ph | null | The rare kaon decay K^+ --> \pi^+ \nu \bar{\nu} is considered in the
framework of the models based on the SU(3)_C X SU(3)_L X U(1)_N (3 - 3 - 1)
gauge group. It is shown that a lower bound of the Z' mass in the 3 - 3 - 1
model with right-handed neutrinos at a value of 3 TeV is derived, while that in
the minimal version -- 1.7 TeV.
| [
{
"created": "Mon, 2 Apr 2001 02:49:39 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Long",
"Hoang Ngoc",
""
],
[
"Trung",
"Le Phuoc",
""
],
[
"Van",
"Vo Thanh",
""
]
] | The rare kaon decay K^+ --> \pi^+ \nu \bar{\nu} is considered in the framework of the models based on the SU(3)_C X SU(3)_L X U(1)_N (3 - 3 - 1) gauge group. It is shown that a lower bound of the Z' mass in the 3 - 3 - 1 model with right-handed neutrinos at a value of 3 TeV is derived, while that in the minimal version -- 1.7 TeV. |
0911.2114 | Keijo Kajantie | J. Alanen, K. Kajantie, V. Suur-Uski | A gauge/gravity duality model for gauge theory thermodynamics | 19 pages, 10 figures | Phys.Rev.D80:126008,2009 | 10.1103/PhysRevD.80.126008 | HIP-2009-25/TH | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a gauge/gravity model for the thermodynamics of a gauge theory with
one running coupling. The gravity side contains an ansatz for the metric and a
scalar field, on the field theory side one starts by giving an ansatz for the
beta function describing the scale dependence of the coupling. The model is
based on relating the scale to the extra dimensional coordinate and the beta
function to the gravity fields, thereby also determining the scalar field
potential. We study three different forms of beta functions of increasing
complexity and give semianalytic solutions describing first order or continuous
transitions.
| [
{
"created": "Wed, 11 Nov 2009 11:25:23 GMT",
"version": "v1"
}
] | 2009-12-31 | [
[
"Alanen",
"J.",
""
],
[
"Kajantie",
"K.",
""
],
[
"Suur-Uski",
"V.",
""
]
] | We study a gauge/gravity model for the thermodynamics of a gauge theory with one running coupling. The gravity side contains an ansatz for the metric and a scalar field, on the field theory side one starts by giving an ansatz for the beta function describing the scale dependence of the coupling. The model is based on relating the scale to the extra dimensional coordinate and the beta function to the gravity fields, thereby also determining the scalar field potential. We study three different forms of beta functions of increasing complexity and give semianalytic solutions describing first order or continuous transitions. |
hep-ph/0107271 | Abdelhak Djouadi | Aseshkrishna Datta, Abdelhak Djouadi, Monoranjan Guchait and Yann
Mambrini (LPMT Montpellier) | Charged Higgs production from SUSY particle cascade decays at the LHC | 30 pages with 10 figures, latex. Uses axodraw.sty and epsfig.sty | Phys.Rev.D65:015007,2002 | 10.1103/PhysRevD.65.015007 | PM/01-26 (July 2001) | hep-ph | null | We analyze the cascade decays of the scalar quarks and gluinos of the Minimal
Supersymmetric extension of the Standard Model, which are abundantly produced
at the Large Hadron Collider, into heavier charginos and neutralinos which then
decay into the lighter ones and charged Higgs particles, and show that they can
have substantial branching fractions. The production rates of these Higgs
bosons can be much larger than those from the direct production mechanisms, in
particular for intermediate values of the parameter $\tan \beta$, and could
therefore allow for the detection of these particles. We also discuss charged
Higgs boson production from direct two-body top and bottom squark decays as
well as from two- and three-body gluino decays.
| [
{
"created": "Thu, 26 Jul 2001 12:26:58 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Datta",
"Aseshkrishna",
"",
"LPMT Montpellier"
],
[
"Djouadi",
"Abdelhak",
"",
"LPMT Montpellier"
],
[
"Guchait",
"Monoranjan",
"",
"LPMT Montpellier"
],
[
"Mambrini",
"Yann",
"",
"LPMT Montpellier"
]
] | We analyze the cascade decays of the scalar quarks and gluinos of the Minimal Supersymmetric extension of the Standard Model, which are abundantly produced at the Large Hadron Collider, into heavier charginos and neutralinos which then decay into the lighter ones and charged Higgs particles, and show that they can have substantial branching fractions. The production rates of these Higgs bosons can be much larger than those from the direct production mechanisms, in particular for intermediate values of the parameter $\tan \beta$, and could therefore allow for the detection of these particles. We also discuss charged Higgs boson production from direct two-body top and bottom squark decays as well as from two- and three-body gluino decays. |
1705.04339 | Peter Stoffer | Tobias Isken, Bastian Kubis, Sebastian P. Schneider, Peter Stoffer | Dispersion relations for $\eta'\to\eta\pi\pi$ | 22 pages, 10 figures; v2: added footnote, version published in EPJC | Eur. Phys. J. C77 (2017) 489 | 10.1140/epjc/s10052-017-5024-1 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a dispersive analysis of the decay amplitude for
$\eta'\to\eta\pi\pi$ that is based on the fundamental principles of analyticity
and unitarity. In this framework, final-state interactions are fully taken into
account. Our dispersive representation relies only on input for the $\pi\pi$
and $\pi\eta$ scattering phase shifts. Isospin symmetry allows us to describe
both the charged and neutral decay channel in terms of the same function. The
dispersion relation contains subtraction constants that cannot be fixed by
unitarity. We determine these parameters by a fit to Dalitz-plot data from the
VES and BES-III experiments. We study the prediction of a low-energy theorem
and compare the dispersive fit to variants of chiral perturbation theory.
| [
{
"created": "Thu, 11 May 2017 18:03:31 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Jul 2017 05:52:51 GMT",
"version": "v2"
}
] | 2017-07-25 | [
[
"Isken",
"Tobias",
""
],
[
"Kubis",
"Bastian",
""
],
[
"Schneider",
"Sebastian P.",
""
],
[
"Stoffer",
"Peter",
""
]
] | We present a dispersive analysis of the decay amplitude for $\eta'\to\eta\pi\pi$ that is based on the fundamental principles of analyticity and unitarity. In this framework, final-state interactions are fully taken into account. Our dispersive representation relies only on input for the $\pi\pi$ and $\pi\eta$ scattering phase shifts. Isospin symmetry allows us to describe both the charged and neutral decay channel in terms of the same function. The dispersion relation contains subtraction constants that cannot be fixed by unitarity. We determine these parameters by a fit to Dalitz-plot data from the VES and BES-III experiments. We study the prediction of a low-energy theorem and compare the dispersive fit to variants of chiral perturbation theory. |
1904.01329 | Lauri Niemi | Kimmo Kainulainen, Venus Keus, Lauri Niemi, Kari Rummukainen, Tuomas
V.I. Tenkanen, Ville Vaskonen | On the validity of perturbative studies of the electroweak phase
transition in the Two Higgs Doublet model | null | null | 10.1007/JHEP06(2019)075 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Making use of a dimensionally-reduced effective theory at high temperature,
we perform a nonperturbative study of the electroweak phase transition in the
Two Higgs Doublet model. We focus on two phenomenologically allowed points in
the parameter space, carrying out dynamical lattice simulations to determine
the equilibrium properties of the transition. We discuss the shortcomings of
conventional perturbative approaches based on the resummed effective potential
- regarding the insufficient handling of infrared resummation but also the need
to account for corrections beyond 1-loop order in the presence of large scalar
couplings - and demonstrate that greater accuracy can be achieved with
perturbative methods within the effective theory. We find that in the presence
of very large scalar couplings, strong phase transitions cannot be reliably
studied with any of the methods.
| [
{
"created": "Tue, 2 Apr 2019 10:48:49 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Jun 2019 14:05:28 GMT",
"version": "v2"
}
] | 2019-07-24 | [
[
"Kainulainen",
"Kimmo",
""
],
[
"Keus",
"Venus",
""
],
[
"Niemi",
"Lauri",
""
],
[
"Rummukainen",
"Kari",
""
],
[
"Tenkanen",
"Tuomas V. I.",
""
],
[
"Vaskonen",
"Ville",
""
]
] | Making use of a dimensionally-reduced effective theory at high temperature, we perform a nonperturbative study of the electroweak phase transition in the Two Higgs Doublet model. We focus on two phenomenologically allowed points in the parameter space, carrying out dynamical lattice simulations to determine the equilibrium properties of the transition. We discuss the shortcomings of conventional perturbative approaches based on the resummed effective potential - regarding the insufficient handling of infrared resummation but also the need to account for corrections beyond 1-loop order in the presence of large scalar couplings - and demonstrate that greater accuracy can be achieved with perturbative methods within the effective theory. We find that in the presence of very large scalar couplings, strong phase transitions cannot be reliably studied with any of the methods. |
hep-ph/0703222 | Kyrill Bugaev | Kyrill Bugaev | Quark-Gluon Bags with Surface Tension | 10 pages, 5 figures | Phys.Rev.C76:014903,2007 | 10.1103/PhysRevC.76.014903 | null | hep-ph | null | The temperature and chemical potential dependent surface tension of bags is
introduced into the gas of quark-gluon bags model. This resolves a long
standing problem of a unified description of the first and second order phase
transition with the cross-over. Such an approach is necessary to model the
complicated properties of quark-gluon plasma and hadronic matter from the first
principles of statistical mechanics. The suggested model has an exact
analytical solution and allows one to rigorously study the vicinity of the
critical endpoint of the deconfinement phase transition. The existence of
higher order phase transitions at the critical endpoint is discussed. In
addition, we found that at the curve of a zero surface tension coefficient
there must exist the surface induced phase tranition of the 2$^{nd}$ or higher
order, which separates the pure quark gluon plasma (QGP) from the cross-over
states, that are the mixed states of hadrons and QGP bags. Thus, the present
model predicts that the critical endpoint of quantum chromodynamics is the
tricritical endpoint.
| [
{
"created": "Tue, 20 Mar 2007 20:01:16 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bugaev",
"Kyrill",
""
]
] | The temperature and chemical potential dependent surface tension of bags is introduced into the gas of quark-gluon bags model. This resolves a long standing problem of a unified description of the first and second order phase transition with the cross-over. Such an approach is necessary to model the complicated properties of quark-gluon plasma and hadronic matter from the first principles of statistical mechanics. The suggested model has an exact analytical solution and allows one to rigorously study the vicinity of the critical endpoint of the deconfinement phase transition. The existence of higher order phase transitions at the critical endpoint is discussed. In addition, we found that at the curve of a zero surface tension coefficient there must exist the surface induced phase tranition of the 2$^{nd}$ or higher order, which separates the pure quark gluon plasma (QGP) from the cross-over states, that are the mixed states of hadrons and QGP bags. Thus, the present model predicts that the critical endpoint of quantum chromodynamics is the tricritical endpoint. |
hep-ph/9506386 | Sasha | Alexander Kusenko (University of Pennsylvania) | Tunneling in quantum field theory with spontaneous symmetry breaking | 8 pages, latex, 2 figures appended (uuencoded postscript); complete
postscript file is available at
ftp://dept.physics.upenn.edu/pub/Kusenko/UPR671T.ps | Phys.Lett. B358 (1995) 47-50 | 10.1016/0370-2693(95)00995-W | null | hep-ph cond-mat gr-qc hep-th | null | Tunneling in quantum field theory is well understood in the case of a single
scalar field. However, in theories with spontaneous symmetry breaking, one has
to take into account the additional zero modes which appear due to the
Goldstone phenomenon. We calculate the false vacuum decay rate in this case.
The result may differ significantly from the tunneling rates in the absence of
symmetry breaking.
| [
{
"created": "Wed, 21 Jun 1995 21:18:13 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Kusenko",
"Alexander",
"",
"University of Pennsylvania"
]
] | Tunneling in quantum field theory is well understood in the case of a single scalar field. However, in theories with spontaneous symmetry breaking, one has to take into account the additional zero modes which appear due to the Goldstone phenomenon. We calculate the false vacuum decay rate in this case. The result may differ significantly from the tunneling rates in the absence of symmetry breaking. |
hep-ph/0607171 | Alexander E. Dorokhov | A.E. Dorokhov, W. Broniowski, E. Ruiz Arriola | Photon distribution amplitudes and light-cone wave functions in chiral
quark models | 24 pages, 15 figures | Phys.Rev. D74 (2006) 054023 | 10.1103/PhysRevD.74.054023 | null | hep-ph | null | The leading- and higher-twist distribution amplitudes and light-cone wave
functions of real and virtual photons are analyzed in chiral quark models. The
calculations are performed in the nonlocal quark model based on the instanton
picture of QCD vacuum, as well as in the spectral quark model and the
Nambu--Jona-Lasinio model with the Pauli-Villars regulator, which both treat
interaction of quarks with external fields locally. We find that in all
considered models the leading-twist distribution amplitudes of the real photon
defined at the quark-model momentum scale are constant or remarkably close to
the constant in the $x$ variable, thus are far from the asymptotic limit form.
The QCD evolution to higher momentum scales is necessary and we carry it out at
the leading order of the perturbative theory for the leading-twist amplitudes.
We provide estimates for the magnetic susceptibility of the quark condensate
$\chi_m$ and the coupling $f_{3\gamma}$, which in the nonlocal model turn out
to be close to the estimates from QCD sum rules. We find the higher-twist
distribution amplitudes at the quark model scale and compare them to the
Wandzura-Wilczek estimates. In addition, in the spectral model we evaluate the
distribution amplitudes and light-cone wave functions of the $\rho$-meson.
| [
{
"created": "Fri, 14 Jul 2006 15:20:12 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Dorokhov",
"A. E.",
""
],
[
"Broniowski",
"W.",
""
],
[
"Arriola",
"E. Ruiz",
""
]
] | The leading- and higher-twist distribution amplitudes and light-cone wave functions of real and virtual photons are analyzed in chiral quark models. The calculations are performed in the nonlocal quark model based on the instanton picture of QCD vacuum, as well as in the spectral quark model and the Nambu--Jona-Lasinio model with the Pauli-Villars regulator, which both treat interaction of quarks with external fields locally. We find that in all considered models the leading-twist distribution amplitudes of the real photon defined at the quark-model momentum scale are constant or remarkably close to the constant in the $x$ variable, thus are far from the asymptotic limit form. The QCD evolution to higher momentum scales is necessary and we carry it out at the leading order of the perturbative theory for the leading-twist amplitudes. We provide estimates for the magnetic susceptibility of the quark condensate $\chi_m$ and the coupling $f_{3\gamma}$, which in the nonlocal model turn out to be close to the estimates from QCD sum rules. We find the higher-twist distribution amplitudes at the quark model scale and compare them to the Wandzura-Wilczek estimates. In addition, in the spectral model we evaluate the distribution amplitudes and light-cone wave functions of the $\rho$-meson. |
2403.02237 | Tanay Pathak | Souvik Bera and Tanay Pathak | Analytic continuations and numerical evaluation of the Appell $F_1$,
$F_3$, Lauricella $F_D^{(3)}$ and Lauricella-Saran $F_S^{(3)}$ and their
Application to Feynman Integrals | 25 pages, 1 figure, Repository see
https://github.com/souvik5151/Appell_Lauricella_Saran_functions | null | null | null | hep-ph cs.MS hep-th math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | We present our investigation of the study of two variable hypergeometric
series, namely Appell $F_{1}$ and $F_{3}$ series, and obtain a comprehensive
list of its analytic continuations enough to cover the whole real $(x,y)$
plane, except on their singular loci. We also derive analytic continuations of
their 3-variable generalization, the Lauricella $F_{D}^{(3)}$ series and the
Lauricella-Saran $F_{S}^{(3)}$ series, leveraging the analytic continuations of
$F_{1}$ and $F_{3}$, which ensures that the whole real $(x,y,z)$ space is
covered, except on the singular loci of these functions. While these studies
are motivated by the frequent occurrence of these multivariable hypergeometric
functions in Feynman integral evaluation, they can also be used whenever they
appear in other branches of mathematical physics. To facilitate their practical
use, we provide four packages: $\texttt{AppellF1.wl}$, $\texttt{AppellF3.wl}$,
$\texttt{LauricellaFD.wl}$, and $\texttt{LauricellaSaranFS.wl}$ in
$\textit{MATHEMATICA}$. These packages are applicable for generic as well as
non-generic values of parameters, keeping in mind their utilities in the
evaluation of the Feynman integrals. We explicitly present various physical
applications of these packages in the context of Feynman integral evaluation
and compare the results using other means as well. Various
$\textit{MATHEMATICA}$ notebooks demonstrating different numerical results are
also provided along with this paper.
| [
{
"created": "Mon, 4 Mar 2024 17:29:25 GMT",
"version": "v1"
}
] | 2024-03-05 | [
[
"Bera",
"Souvik",
""
],
[
"Pathak",
"Tanay",
""
]
] | We present our investigation of the study of two variable hypergeometric series, namely Appell $F_{1}$ and $F_{3}$ series, and obtain a comprehensive list of its analytic continuations enough to cover the whole real $(x,y)$ plane, except on their singular loci. We also derive analytic continuations of their 3-variable generalization, the Lauricella $F_{D}^{(3)}$ series and the Lauricella-Saran $F_{S}^{(3)}$ series, leveraging the analytic continuations of $F_{1}$ and $F_{3}$, which ensures that the whole real $(x,y,z)$ space is covered, except on the singular loci of these functions. While these studies are motivated by the frequent occurrence of these multivariable hypergeometric functions in Feynman integral evaluation, they can also be used whenever they appear in other branches of mathematical physics. To facilitate their practical use, we provide four packages: $\texttt{AppellF1.wl}$, $\texttt{AppellF3.wl}$, $\texttt{LauricellaFD.wl}$, and $\texttt{LauricellaSaranFS.wl}$ in $\textit{MATHEMATICA}$. These packages are applicable for generic as well as non-generic values of parameters, keeping in mind their utilities in the evaluation of the Feynman integrals. We explicitly present various physical applications of these packages in the context of Feynman integral evaluation and compare the results using other means as well. Various $\textit{MATHEMATICA}$ notebooks demonstrating different numerical results are also provided along with this paper. |
0907.1923 | Michael Eides | Michael I. Eides and Valery A. Shelyuto | Three-Loop Radiative-Recoil Corrections to Hyperfine Splitting in
Muonium: Diagrams with Polarization Loops | 8 pages, 10 figures. Editorial changes, results unchanged. Version
published in Phys.Rev.Lett | Phys.Rev.Lett.103:133003,2009 | 10.1103/PhysRevLett.103.133003 | UK/09-05 | hep-ph physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider three-loop radiative-recoil corrections to hyperfine splitting in
muonium generated by the diagrams with electron and muon vacuum polarizations.
We calculate single-logarithmic and nonlogarithmic contributions of order
$\alpha^3(m/M)E_F$ generated by gauge invariant sets of diagrams with electron
and muon polarization insertions in the electron and muon factors. Combining
the new contributions with our older results we present complete result for all
three-loop radiative-recoil corrections generated by the diagrams with electron
and muon polarization loops.
| [
{
"created": "Fri, 10 Jul 2009 22:09:00 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Sep 2009 04:14:10 GMT",
"version": "v2"
}
] | 2010-01-26 | [
[
"Eides",
"Michael I.",
""
],
[
"Shelyuto",
"Valery A.",
""
]
] | We consider three-loop radiative-recoil corrections to hyperfine splitting in muonium generated by the diagrams with electron and muon vacuum polarizations. We calculate single-logarithmic and nonlogarithmic contributions of order $\alpha^3(m/M)E_F$ generated by gauge invariant sets of diagrams with electron and muon polarization insertions in the electron and muon factors. Combining the new contributions with our older results we present complete result for all three-loop radiative-recoil corrections generated by the diagrams with electron and muon polarization loops. |
1102.0017 | Guy D. Moore | Egang Lu, Guy D. Moore | The Bulk Viscosity of a Pion Gas | 13 pages, two figures | Phys.Rev.C83:044901,2011 | 10.1103/PhysRevC.83.044901 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the bulk viscosity of a gas of pions at temperatures below the QCD
crossover temperature, for the physical value of pion mass, to lowest order in
chiral perturbation theory. Bulk viscosity is controlled by number-changing
processes which become exponentially slow at low temperatures when the pions
become exponentially dilute, leading to an exponentially large bulk viscosity
zeta ~ (F_0^8/m_\pi^5) exp(2m_\pi/T), where F_0 = 93 MeV is the pion decay
constant.
| [
{
"created": "Mon, 31 Jan 2011 21:31:03 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Lu",
"Egang",
""
],
[
"Moore",
"Guy D.",
""
]
] | We compute the bulk viscosity of a gas of pions at temperatures below the QCD crossover temperature, for the physical value of pion mass, to lowest order in chiral perturbation theory. Bulk viscosity is controlled by number-changing processes which become exponentially slow at low temperatures when the pions become exponentially dilute, leading to an exponentially large bulk viscosity zeta ~ (F_0^8/m_\pi^5) exp(2m_\pi/T), where F_0 = 93 MeV is the pion decay constant. |
hep-ph/9602381 | Peter White | B. de Carlos (Sussex) and P.L. White (Oxford) | R-parity Violation Effects through Soft Supersymmetry Breaking Terms and
the Renormalisation Group | 41 pages plain LaTeX, 15 figures all uuencoded and gzipped (typos
fixed and trivial changes ready for Phys. Rev. D) | Phys.Rev.D54:3427-3446,1996 | 10.1103/PhysRevD.54.3427 | SUSX-TH/96-003, OUTP-96-01P, IEM-FT-125/96 | hep-ph | null | We present full renormalisation group equations for the MSSM with R-parity
violation, including all soft supersymmetry breaking terms. The inclusion of
dimensionless R-parity violating couplings can generate many possible low
energy effects through the generation of off-diagonal soft masses violating
lepton and quark flavour, and through the generation of lepton-Higgs mixing. We
discuss the relation between the weak and unification scale R-parity violation
and study the effects on neutrino mass generation and $\mu\to e\gamma$.
| [
{
"created": "Fri, 23 Feb 1996 12:43:18 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jun 1996 16:49:38 GMT",
"version": "v2"
}
] | 2009-10-29 | [
[
"de Carlos",
"B.",
"",
"Sussex"
],
[
"White",
"P. L.",
"",
"Oxford"
]
] | We present full renormalisation group equations for the MSSM with R-parity violation, including all soft supersymmetry breaking terms. The inclusion of dimensionless R-parity violating couplings can generate many possible low energy effects through the generation of off-diagonal soft masses violating lepton and quark flavour, and through the generation of lepton-Higgs mixing. We discuss the relation between the weak and unification scale R-parity violation and study the effects on neutrino mass generation and $\mu\to e\gamma$. |
2312.13882 | Ricardo Aguirre | R. M. Aguirre | Effects of the anomalous magnetic moments of the quarks on the neutral
pion properties within a SU(2) Nambu-Jona Lasinio model | 8 figures | The European Physical Journal A 57, 166 (2021) | 10.1140/epja/s10050-021-00480-1 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The properties of the neutral pion in quark matter under the influence of an
external magnetic field are studied. The effects of the anomalous magnetic
moments (AMM) of the quarks at finite density is considered. The inclusion of
the AMM into the NJL model gives rise to additional magnetic effects. In
particular the Dirac sea produce new divergences in the vacuum contributions,
which depend explicitly on the magnetic field. An improper treatment of these
contributions is the source of unphysical results, as emphasized in recent
investigations. The pion polarization function is evaluated in the random phase
approximation using analytic regularization and a subtraction scheme to deal
with such divergencies. This procedure is combined with the standard three
momentum cutoff, and reduces to it for vanishing magnetic intensity. The pion
mass and coupling constant are evaluated for a wide range of magnetic intensity
and baryonic density.
| [
{
"created": "Thu, 21 Dec 2023 14:27:25 GMT",
"version": "v1"
}
] | 2023-12-22 | [
[
"Aguirre",
"R. M.",
""
]
] | The properties of the neutral pion in quark matter under the influence of an external magnetic field are studied. The effects of the anomalous magnetic moments (AMM) of the quarks at finite density is considered. The inclusion of the AMM into the NJL model gives rise to additional magnetic effects. In particular the Dirac sea produce new divergences in the vacuum contributions, which depend explicitly on the magnetic field. An improper treatment of these contributions is the source of unphysical results, as emphasized in recent investigations. The pion polarization function is evaluated in the random phase approximation using analytic regularization and a subtraction scheme to deal with such divergencies. This procedure is combined with the standard three momentum cutoff, and reduces to it for vanishing magnetic intensity. The pion mass and coupling constant are evaluated for a wide range of magnetic intensity and baryonic density. |
hep-ph/9711356 | Moultaka Gilbert | Christophe Le Mouel and Gilbert Moultaka | Novel Electroweak Symmetry Breaking Conditions From Quantum Effects In
The MSSM | Latex, 45 pages, 5 figures | Nucl.Phys. B518 (1998) 3-36 | 10.1016/S0550-3213(98)00030-3 | PM/97-26 | hep-ph | null | We present, in the context of the Minimal Supersymmetric Standard Model, a
detailed one-loop analytic study of the minimization conditions of the
effective potential in the Higgs sector.
Special emphasis is put on the role played by $Str M^4$ in the determination
of the electroweak symmetry breaking conditions, where first and second order
derivatives of the effective potential are systematically taken into account.
Novel, necessary (and sufficient in the Higgs sector) model-independent
constraints, are thus obtained analytically, leading to new theoretical lower
and upper bounds on $\tan \beta$. Although fully model-independent, these
bounds are found to be much more restrictive than the existing model-dependent
ones! A first illustration is given in the context of a SUGRA-GUT motivated
scenario.
| [
{
"created": "Mon, 17 Nov 1997 21:28:36 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Mouel",
"Christophe Le",
""
],
[
"Moultaka",
"Gilbert",
""
]
] | We present, in the context of the Minimal Supersymmetric Standard Model, a detailed one-loop analytic study of the minimization conditions of the effective potential in the Higgs sector. Special emphasis is put on the role played by $Str M^4$ in the determination of the electroweak symmetry breaking conditions, where first and second order derivatives of the effective potential are systematically taken into account. Novel, necessary (and sufficient in the Higgs sector) model-independent constraints, are thus obtained analytically, leading to new theoretical lower and upper bounds on $\tan \beta$. Although fully model-independent, these bounds are found to be much more restrictive than the existing model-dependent ones! A first illustration is given in the context of a SUGRA-GUT motivated scenario. |
1603.09553 | Jean Cleymans | H. Oeschler, J. Cleymans, B. Hippolyte, K. Redlich, N. Sharma | Thermal Model Description of Collisions of Small Nuclei | 8 pages, 4 figures | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dependence of particle production on the size of the colliding nuclei is
analysed in terms of the thermal model using the canonical ensemble. The
concept of strangeness correlation in clusters of sub-volume $V_c$ is used to
account for the suppression of strangeness. A systematic analysis is presented
of the predictions of the thermal model for particle production in collisions
of small nuclei. The pattern of the maxima of strange-particles-to-pion ratios
as a function of beam energy is quite special, as they do not occur at the same
beam energy and are sensitive to system size. In particular, the
$\Lambda/\pi^+$ ratio shows a clear maximum even for small systems while the
maximum in the K$^+/\pi^+$ ratio is less pronounced
| [
{
"created": "Thu, 31 Mar 2016 12:16:04 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Feb 2017 16:38:43 GMT",
"version": "v2"
}
] | 2017-02-09 | [
[
"Oeschler",
"H.",
""
],
[
"Cleymans",
"J.",
""
],
[
"Hippolyte",
"B.",
""
],
[
"Redlich",
"K.",
""
],
[
"Sharma",
"N.",
""
]
] | The dependence of particle production on the size of the colliding nuclei is analysed in terms of the thermal model using the canonical ensemble. The concept of strangeness correlation in clusters of sub-volume $V_c$ is used to account for the suppression of strangeness. A systematic analysis is presented of the predictions of the thermal model for particle production in collisions of small nuclei. The pattern of the maxima of strange-particles-to-pion ratios as a function of beam energy is quite special, as they do not occur at the same beam energy and are sensitive to system size. In particular, the $\Lambda/\pi^+$ ratio shows a clear maximum even for small systems while the maximum in the K$^+/\pi^+$ ratio is less pronounced |
hep-ph/0309112 | Zhi-Zhong Xing | Zhi-zhong Xing, He Zhang | Complete Parameter Space of Quark Mass Matrices with Four Texture Zeros | RevTex 10 pages (3 PS figures included) | J.Phys.G30:129-136,2004 | 10.1088/0954-3899/30/2/011 | null | hep-ph | null | The full parameter space of Hermitian quark mass matrices with four texture
zeros is explored by using current experimental data. We find that all ten free
parameters of the four-zero quark mass matrices can well be constrained. In
particular, only one of the two phase parameters plays an important role in CP
violation. The structural features of this specific pattern of quark mass
matrices are also discussed in detail.
| [
{
"created": "Wed, 10 Sep 2003 14:26:35 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Xing",
"Zhi-zhong",
""
],
[
"Zhang",
"He",
""
]
] | The full parameter space of Hermitian quark mass matrices with four texture zeros is explored by using current experimental data. We find that all ten free parameters of the four-zero quark mass matrices can well be constrained. In particular, only one of the two phase parameters plays an important role in CP violation. The structural features of this specific pattern of quark mass matrices are also discussed in detail. |
1302.0624 | Jarah Evslin | Emilio Ciuffoli, Jarah Evslin and Xinmin Zhang | The Neutrino Mass Hierarchy from Nuclear Reactor Experiments | 12 pages, v3: +backgrounds, energy response and other challenges | Phys. Rev. D. 88, 033017 (2013) | 10.1103/PhysRevD.88.033017 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | 10 years from now reactor neutrino experiments will attempt to determine
which neutrino mass eigenstate is the most massive. In this letter we present
the results of more than seven million detailed simulations of such
experiments, studying the dependence of the probability of successfully
determining the mass hierarchy upon the analysis method, the neutrino mass
matrix parameters, reactor flux models, geoneutrinos and, in particular,
combinations of baselines. We show that a recently reported spurious dependence
of the data analysis upon the high energy tail of the reactor spectrum can be
removed by using a weighted Fourier transform. We determine the optimal
baselines and corresponding detector locations. For most values of the
CP-violating, leptonic Dirac phase delta, a degeneracy prevents NOvA and T2K
from determining either delta or the hierarchy. We determine the confidence
with which a reactor experiment can determine the hierarchy, breaking the
degeneracy.
| [
{
"created": "Mon, 4 Feb 2013 09:24:54 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Mar 2013 06:31:51 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Aug 2013 17:24:37 GMT",
"version": "v3"
}
] | 2013-09-16 | [
[
"Ciuffoli",
"Emilio",
""
],
[
"Evslin",
"Jarah",
""
],
[
"Zhang",
"Xinmin",
""
]
] | 10 years from now reactor neutrino experiments will attempt to determine which neutrino mass eigenstate is the most massive. In this letter we present the results of more than seven million detailed simulations of such experiments, studying the dependence of the probability of successfully determining the mass hierarchy upon the analysis method, the neutrino mass matrix parameters, reactor flux models, geoneutrinos and, in particular, combinations of baselines. We show that a recently reported spurious dependence of the data analysis upon the high energy tail of the reactor spectrum can be removed by using a weighted Fourier transform. We determine the optimal baselines and corresponding detector locations. For most values of the CP-violating, leptonic Dirac phase delta, a degeneracy prevents NOvA and T2K from determining either delta or the hierarchy. We determine the confidence with which a reactor experiment can determine the hierarchy, breaking the degeneracy. |
1207.5401 | Francois Gelis | K. Dusling, T. Epelbaum, F. Gelis, R. Venugopalan | Initial state and thermalization | 4 pages, 9 figures, talk given by FG at Hard Probes 2012 (may 27th -
june 1st, 2012, Cagliari, Italy) | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report recent results on the role of instabilities in the isotropization
and thermalization of a longitudinally expanding system of quantum fields.
| [
{
"created": "Mon, 23 Jul 2012 14:17:05 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Oct 2012 11:58:59 GMT",
"version": "v2"
}
] | 2012-10-08 | [
[
"Dusling",
"K.",
""
],
[
"Epelbaum",
"T.",
""
],
[
"Gelis",
"F.",
""
],
[
"Venugopalan",
"R.",
""
]
] | We report recent results on the role of instabilities in the isotropization and thermalization of a longitudinally expanding system of quantum fields. |
2012.14013 | Duygu Yildirim Yilmaz | E. Cincioglu, A. Ozpineci, D. Yildirim Yilmaz | The effects of charmonium on the properties of the $1^{++}$ hidden charm
poles in effective field theory | 24 pages, 2 figures | Nucl.Phys.A 1014 (2021) 122259 | 10.1016/j.nuclphysa.2021.122259 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this study, the properties of the $J^{PC}=1^{++}$ hidden charm poles are
analyzed under the variation of the bare 2P charmonium mass within the
effective field theory proposed in Ref.[1]. The main focus of the current work
is on the pole trajectory of the $\chi_{c1}(2P)$ charmonium dressed by the $D
\bar{D}^*$ meson loops. It is shown that the trajectories of the pole change
radically for values of the bare charmonium mass above a certain value and also
depending on how close the pole is to the threshold.
| [
{
"created": "Sun, 27 Dec 2020 21:10:42 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Aug 2021 07:31:57 GMT",
"version": "v2"
}
] | 2021-08-18 | [
[
"Cincioglu",
"E.",
""
],
[
"Ozpineci",
"A.",
""
],
[
"Yilmaz",
"D. Yildirim",
""
]
] | In this study, the properties of the $J^{PC}=1^{++}$ hidden charm poles are analyzed under the variation of the bare 2P charmonium mass within the effective field theory proposed in Ref.[1]. The main focus of the current work is on the pole trajectory of the $\chi_{c1}(2P)$ charmonium dressed by the $D \bar{D}^*$ meson loops. It is shown that the trajectories of the pole change radically for values of the bare charmonium mass above a certain value and also depending on how close the pole is to the threshold. |
hep-ph/0605052 | Jens Erler | Jens Erler and Genaro Toledo Sanchez | Upper Bound on the Hadronic Light-by-Light Contribution to the Muon g-2 | 4 pages; 2 references added, some changes in text; final version | Phys.Rev.Lett. 97 (2006) 161801 | 10.1103/PhysRevLett.97.161801 | null | hep-ph hep-ex | null | There are indications that hadronic loops in some electroweak observables are
almost saturated by parton level effects. Taking this as the hypothesis for
this work, we propose a genuine parton level estimate of the hadronic
light-by-light contribution to the anomalous magnetic moment of the muon, a_mu
(LBL,had). Our quark mass definitions and values are motivated in detail, and
the simplicity of our approach allows for a transparent error estimate. For
infinitely heavy quarks our treatment is exact, while for asymptotically small
quark masses a_mu (LBL,had) is overestimated. Interpolating, this suggests
quoting an upper bound. We obtain a_mu (LBL,had) < 1.59 10^-9 (95% CL).
| [
{
"created": "Fri, 5 May 2006 17:04:09 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Oct 2006 23:59:05 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Erler",
"Jens",
""
],
[
"Sanchez",
"Genaro Toledo",
""
]
] | There are indications that hadronic loops in some electroweak observables are almost saturated by parton level effects. Taking this as the hypothesis for this work, we propose a genuine parton level estimate of the hadronic light-by-light contribution to the anomalous magnetic moment of the muon, a_mu (LBL,had). Our quark mass definitions and values are motivated in detail, and the simplicity of our approach allows for a transparent error estimate. For infinitely heavy quarks our treatment is exact, while for asymptotically small quark masses a_mu (LBL,had) is overestimated. Interpolating, this suggests quoting an upper bound. We obtain a_mu (LBL,had) < 1.59 10^-9 (95% CL). |
1202.2346 | Girma Hailu | Girma Hailu | Glueball Masses from Linearly Confining Supergravity | 11 pages | Phys.Rev. D85 (2012) 106008 | 10.1103/PhysRevD.85.106008 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Mass spectrum of 0++ glueballs is produced using a dual supergravity theory
we proposed for pure N=1 SU(N) gauge theory in four dimensions in the large N
limit in the IR. The glueball states are expressed in terms of Whittaker
functions. The spectrum is discrete and a function whose roots give the masses
is written. The ratios of the masses are independent of the parameters of the
theory and comparison to recent non-supersymmetric large N lattice QCD data
available for the lowest three states shows agreement to within five percent.
| [
{
"created": "Fri, 10 Feb 2012 20:56:50 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Hailu",
"Girma",
""
]
] | Mass spectrum of 0++ glueballs is produced using a dual supergravity theory we proposed for pure N=1 SU(N) gauge theory in four dimensions in the large N limit in the IR. The glueball states are expressed in terms of Whittaker functions. The spectrum is discrete and a function whose roots give the masses is written. The ratios of the masses are independent of the parameters of the theory and comparison to recent non-supersymmetric large N lattice QCD data available for the lowest three states shows agreement to within five percent. |
2111.03582 | Armando Bermudez Martinez | Armando Bermudez Martinez, Luis I. Estevez Banos, Hannes Jung,
Jindrich Lidrych, Mikel Mendizabal, Sara Taheri Monfared, Qun Wang and Heng
Yang | Application of TMD parton showers obtained with the Parton Branching
approach to Drell Yan + jets production | 6 pages, 3 figures, conference paper | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Calculations of Drell-Yan (DY) production at next-to-leading (NLO) order have
been combined with Transverse Momentum Dependent (TMD) distributions obtained
with the Parton Branching (PB). The predictions show a remarkable agreement
with DY measurement from E605 experiment, consistent with previous results we
obtained for R209, PHENIX, CMS and ATLAS experiments. We also present
predictions for Z+jet measurements showing the importance of TMD parton shower
contributions to the jet multiplicity. We show that PB-TMD parton density and
the corresponding PB-TMD parton shower can be combined with leading-order (LO)
matrix element using the newly developed TMD merging algorithm to obtain a very
good description of measurements over a wide kinematic range.
| [
{
"created": "Fri, 5 Nov 2021 16:03:37 GMT",
"version": "v1"
}
] | 2021-11-08 | [
[
"Martinez",
"Armando Bermudez",
""
],
[
"Banos",
"Luis I. Estevez",
""
],
[
"Jung",
"Hannes",
""
],
[
"Lidrych",
"Jindrich",
""
],
[
"Mendizabal",
"Mikel",
""
],
[
"Monfared",
"Sara Taheri",
""
],
[
"Wang",
"Qun",
""
],
[
"Yang",
"Heng",
""
]
] | Calculations of Drell-Yan (DY) production at next-to-leading (NLO) order have been combined with Transverse Momentum Dependent (TMD) distributions obtained with the Parton Branching (PB). The predictions show a remarkable agreement with DY measurement from E605 experiment, consistent with previous results we obtained for R209, PHENIX, CMS and ATLAS experiments. We also present predictions for Z+jet measurements showing the importance of TMD parton shower contributions to the jet multiplicity. We show that PB-TMD parton density and the corresponding PB-TMD parton shower can be combined with leading-order (LO) matrix element using the newly developed TMD merging algorithm to obtain a very good description of measurements over a wide kinematic range. |
2401.14229 | Liliana Apolin\'ario | Liliana Apolin\'ario, Pablo Guerrero-Rodr\'iguez, Korinna Zapp | Exploring the time axis within medium-modified jets | 12 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this manuscript, we illustrate how to use the newly proposed $\tau$
re-clustering algorithm to select jets with different degrees of quenching
without biasing their initial transverse momentum spectrum. Our study is based
on Z+jet simulated events using the JEWEL Monte Carlo event generator to
account for jet quenching effects. We apply the $\tau$ re-clustering algorithm
to extract a proxy for a time axis (formation time) within the evolving medium.
This information allows us to label jets according to their fragmentation
pattern and select populations with enhanced sensitivity to quenching effects.
Our results illustrate the potential of jets as precision tools for QGP
tomography. Further, we show that the discussed method minimizes the biases
stemming from $p_{T}$-, $dR$- or mass-based jet selection.
| [
{
"created": "Thu, 25 Jan 2024 15:15:30 GMT",
"version": "v1"
}
] | 2024-01-26 | [
[
"Apolinário",
"Liliana",
""
],
[
"Guerrero-Rodríguez",
"Pablo",
""
],
[
"Zapp",
"Korinna",
""
]
] | In this manuscript, we illustrate how to use the newly proposed $\tau$ re-clustering algorithm to select jets with different degrees of quenching without biasing their initial transverse momentum spectrum. Our study is based on Z+jet simulated events using the JEWEL Monte Carlo event generator to account for jet quenching effects. We apply the $\tau$ re-clustering algorithm to extract a proxy for a time axis (formation time) within the evolving medium. This information allows us to label jets according to their fragmentation pattern and select populations with enhanced sensitivity to quenching effects. Our results illustrate the potential of jets as precision tools for QGP tomography. Further, we show that the discussed method minimizes the biases stemming from $p_{T}$-, $dR$- or mass-based jet selection. |
1112.4405 | Daniel de Florian | Stefano Catani, Daniel de Florian and German Rodrigo | Space-like (vs. time-like) collinear limits in QCD: is factorization
violated? | 81 pages, 5 figures, typos corrected in the text, few comments added
and inclusion of NOTE ADDED on recent developments | null | 10.1007/JHEP07(2012)026 | LPN11-94; IFIC/11-72; ZU-TH 27/11 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the singular behaviour of QCD scattering amplitudes in
kinematical configurations where two or more momenta of the external partons
become collinear. At the tree level, this behaviour is known to be controlled
by factorization formulae in which the singular collinear factor is universal
(process independent). We show that this strict (process-independent)
factorization is not valid at one-loop and higher-loop orders in the case of
the collinear limit in space-like regions (e.g., collinear radiation from
initial-state partons). We introduce a generalized version of all-order
collinear factorization, in which the space-like singular factors retain some
dependence on the momentum and colour charge of the non-collinear partons. We
present explicit results on one-loop and two-loop amplitudes for both the
two-parton and multiparton collinear limits. At the level of square amplitudes
and, more generally, cross sections in hadron--hadron collisions, the violation
of strict collinear factorization has implications on the non-abelian structure
of logarithmically-enhanced terms in perturbative calculations (starting from
the next-to-next-to-leading order) and on various factorization issues of mass
singularities (starting from the next-to-next-to-next-to-leading order).
| [
{
"created": "Mon, 19 Dec 2011 17:04:20 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jun 2012 16:49:22 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Catani",
"Stefano",
""
],
[
"de Florian",
"Daniel",
""
],
[
"Rodrigo",
"German",
""
]
] | We consider the singular behaviour of QCD scattering amplitudes in kinematical configurations where two or more momenta of the external partons become collinear. At the tree level, this behaviour is known to be controlled by factorization formulae in which the singular collinear factor is universal (process independent). We show that this strict (process-independent) factorization is not valid at one-loop and higher-loop orders in the case of the collinear limit in space-like regions (e.g., collinear radiation from initial-state partons). We introduce a generalized version of all-order collinear factorization, in which the space-like singular factors retain some dependence on the momentum and colour charge of the non-collinear partons. We present explicit results on one-loop and two-loop amplitudes for both the two-parton and multiparton collinear limits. At the level of square amplitudes and, more generally, cross sections in hadron--hadron collisions, the violation of strict collinear factorization has implications on the non-abelian structure of logarithmically-enhanced terms in perturbative calculations (starting from the next-to-next-to-leading order) and on various factorization issues of mass singularities (starting from the next-to-next-to-next-to-leading order). |
hep-ph/9604330 | Stefan Herrlich | Stefan Herrlich (DESY - IfH Zeuthen), Ulrich Nierste (TU Munich) | The Complete |Delta S|=2 Hamiltonian in the Next-To-Leading Order | 68 pages, requires LaTeX2e and the standard LaTeX-packages epsf.sty,
rotate.sty, a4.sty, subeqn.sty, cite.sty, array.sty, dcolumn.sty; Figures are
submitted as a seperate tar.gz-file. A complete PostScript version may be
obtained from
ftp://feynman.t30.physik.tu-muenchen.de/pub/preprints/tum-86-96.ps.gz or
ftp://feynman.t30.physik.tu-muenchen.de/pub/preprints/tum-86-96.ps2.gz
(scaled down and rotated version to print two pages on one sheet of paper).
Source available at
ftp://feynman.t30.physik.tu-muenchen.de/pub/preprints/tum-86-96.tar.gz | Nucl.Phys. B476 (1996) 27-88 | 10.1016/0550-3213(96)00324-0 | null | hep-ph | null | We present the complete next-to-leading order short-distance QCD corrections
to the effective \dstwo -hamiltonian in the Standard Model. The calculation of
the coefficient $\eta_3$ is described in great detail. It involves the two-loop
mixing of bilocal structures composed of two \dsone\ operators into \dstwo\
operators. The next-to-leading order corrections enhance $\eta_3$ by 27\% to
$\eta_3=0.47 \errorpm{+0.03}{-0.04}$ thereby affecting the phenomenology of
$\epsilon_K$ sizeably. $\eta_3$ depends on the physical input parameters $m_t$,
$m_c$ and $\laMSb$ only weakly. The quoted error stems from renormalization
scale dependences, which have reduced compared to the old leading log result.
The known calculation of $\eta_1$ and $\eta_2$ is repeated in order to compare
the structure of the three QCD coefficients. We further discuss some field
theoretical aspects of the calculation such as the renormalization group
equation for Green's functions with two operator insertions and the
renormalization scheme dependence caused by the presence of evanescent
operators.
| [
{
"created": "Tue, 16 Apr 1996 15:26:37 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Herrlich",
"Stefan",
"",
"DESY - IfH Zeuthen"
],
[
"Nierste",
"Ulrich",
"",
"TU Munich"
]
] | We present the complete next-to-leading order short-distance QCD corrections to the effective \dstwo -hamiltonian in the Standard Model. The calculation of the coefficient $\eta_3$ is described in great detail. It involves the two-loop mixing of bilocal structures composed of two \dsone\ operators into \dstwo\ operators. The next-to-leading order corrections enhance $\eta_3$ by 27\% to $\eta_3=0.47 \errorpm{+0.03}{-0.04}$ thereby affecting the phenomenology of $\epsilon_K$ sizeably. $\eta_3$ depends on the physical input parameters $m_t$, $m_c$ and $\laMSb$ only weakly. The quoted error stems from renormalization scale dependences, which have reduced compared to the old leading log result. The known calculation of $\eta_1$ and $\eta_2$ is repeated in order to compare the structure of the three QCD coefficients. We further discuss some field theoretical aspects of the calculation such as the renormalization group equation for Green's functions with two operator insertions and the renormalization scheme dependence caused by the presence of evanescent operators. |
1706.08510 | James Cline | James M. Cline, Jorge Martin Camalich | $B$ decay anomalies from nonabelian local horizontal symmetry | 13 pages, 4 figures; v2: minor corrections and improvements,
references added; v3: corrected fig.1, published version | Phys. Rev. D 96, 055036 (2017) | 10.1103/PhysRevD.96.055036 | CERN-TH-2017-136 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent anomalies in $B\to K^{(*)}\ell\ell$ meson decays are consistent with
exchange of a heavy $Z'$ vector boson. Here we try to connect such new physics
to understanding the origin of flavor, by gauging generation number.
Phenomenological and theoretical considerations suggest that the smallest
viable flavor symmetry (not including any extra U(1) factors) is chiral ${\rm
SU(3)}_L\times{\rm SU(3)}_R$, which acts only on generation indices and does
not distinguish between quarks and leptons. Spontaneous breaking of the
symmetry gives rise to the standard model Yukawa matrices, and masses for the
16 $Z'$-like gauge bosons, one of which is presumed to be light enough to
explain the $B\to K^{(*)}\ell\ell$ anomalies. We perform a bottom-up study of
this framework, showing that it is highly constrained by LHC dilepton searches,
meson mixing, $Z$ decays and CKM unitarity. Similar anomalies are predicted for
semileptonic decays of $B$ to lighter mesons, with excesses in the
$ee,\tau\tau$ channels and deficits in $\mu\mu$, but no deviation in $\nu\nu$.
The lightest $Z'$ mass is $\lesssim 6\,$TeV if the gauge coupling is $\lesssim
1$.
| [
{
"created": "Mon, 26 Jun 2017 17:59:50 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Jul 2017 01:30:33 GMT",
"version": "v2"
},
{
"created": "Fri, 13 Oct 2017 08:35:58 GMT",
"version": "v3"
}
] | 2017-10-16 | [
[
"Cline",
"James M.",
""
],
[
"Camalich",
"Jorge Martin",
""
]
] | Recent anomalies in $B\to K^{(*)}\ell\ell$ meson decays are consistent with exchange of a heavy $Z'$ vector boson. Here we try to connect such new physics to understanding the origin of flavor, by gauging generation number. Phenomenological and theoretical considerations suggest that the smallest viable flavor symmetry (not including any extra U(1) factors) is chiral ${\rm SU(3)}_L\times{\rm SU(3)}_R$, which acts only on generation indices and does not distinguish between quarks and leptons. Spontaneous breaking of the symmetry gives rise to the standard model Yukawa matrices, and masses for the 16 $Z'$-like gauge bosons, one of which is presumed to be light enough to explain the $B\to K^{(*)}\ell\ell$ anomalies. We perform a bottom-up study of this framework, showing that it is highly constrained by LHC dilepton searches, meson mixing, $Z$ decays and CKM unitarity. Similar anomalies are predicted for semileptonic decays of $B$ to lighter mesons, with excesses in the $ee,\tau\tau$ channels and deficits in $\mu\mu$, but no deviation in $\nu\nu$. The lightest $Z'$ mass is $\lesssim 6\,$TeV if the gauge coupling is $\lesssim 1$. |
hep-ph/9805491 | Valentin Kuznetsov | Elena N. Bukina, Vladimir M. Dubovik (JINR, Russia) and Valentin E.
Kuznetsov (CERN, Switzerland and JINR, Russia) | Transition Radiation of the Neutrino Toroid Dipole Moment | 8 pages and 4 EPS-figures included. use prd.sty, preprint.sty,
aps.sty and epsfig.sty (RevTeX is used) | Phys.Lett. B435 (1998) 134-138 | 10.1016/S0370-2693(98)00776-X | null | hep-ph | null | We discuss the transition radiation of a neutrino induced by its toroid
dipole moment ($\tau$) when crossing the interface between two different media
with different refraction indices. A neutrino of 1 MeV energy emits
approximately $10^{-40}$ keV at $\tau=e\sqrt{2}G_F/\pi^2$. This effect depends
very slightly on the neutrino mass and has a finite value in the massless
limit.
| [
{
"created": "Thu, 28 May 1998 09:12:31 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Bukina",
"Elena N.",
"",
"JINR, Russia"
],
[
"Dubovik",
"Vladimir M.",
"",
"JINR, Russia"
],
[
"Kuznetsov",
"Valentin E.",
"",
"CERN, Switzerland and JINR, Russia"
]
] | We discuss the transition radiation of a neutrino induced by its toroid dipole moment ($\tau$) when crossing the interface between two different media with different refraction indices. A neutrino of 1 MeV energy emits approximately $10^{-40}$ keV at $\tau=e\sqrt{2}G_F/\pi^2$. This effect depends very slightly on the neutrino mass and has a finite value in the massless limit. |
hep-ph/0011154 | Dr. M. Kirchbach | M. Kirchbach | Degeneracy Symmetry Of Baryon Spectra | Invited talk, to be published in Proc. XVII European Conference on
``Few-Body Problems in Physics'', Evora (Portugal), Sept. 11-16, 2000. 10
pages LaTeX2e with 4 figures | Nucl.Phys. A689 (2001) 157-166 | 10.1016/S0375-9474(01)00830-2 | null | hep-ph | null | We present a data-supported new interpretation of the Rarita-Schwinger fields
which reveals a well-defined pattern in the masses, spins, and parities of the
N-, Delta -, and Lambda -hyperon excitations and which allows to probe the
scale of the chiral phase transition for baryons. The degeneracy symmetry of
the baryonic spectra emerges to be Isospin(x)Space- Time.
| [
{
"created": "Sat, 11 Nov 2000 21:37:40 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kirchbach",
"M.",
""
]
] | We present a data-supported new interpretation of the Rarita-Schwinger fields which reveals a well-defined pattern in the masses, spins, and parities of the N-, Delta -, and Lambda -hyperon excitations and which allows to probe the scale of the chiral phase transition for baryons. The degeneracy symmetry of the baryonic spectra emerges to be Isospin(x)Space- Time. |
2010.12579 | Yury Bystritskiy | A.G. Aleksejevs, S.G. Barkanova, Yu.M. Bystritskiy, V.A. Zykunov | One-Loop Electroweak Radiative Corrections to Bhabha Scattering in the
Belle II Experiment | 6 pages, 9 figures, proceedings for International Bogolyubov
Conference Problems of Theoretical and Mathematical Physics (2019) | Phys.Part.Nucl. 51 (2020) 4, 645-650 | 10.1134/S106377962004005X | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Standard Model radiative corrections to the Bhabha scattering process are
considered within the one-loop approximation. Both virtual corrections and
corrections for the real photon emission are taken into consideration. The
calculation was performed at the energy assumed at the Belle II (Japan)
facility.
| [
{
"created": "Fri, 23 Oct 2020 08:13:15 GMT",
"version": "v1"
}
] | 2020-10-27 | [
[
"Aleksejevs",
"A. G.",
""
],
[
"Barkanova",
"S. G.",
""
],
[
"Bystritskiy",
"Yu. M.",
""
],
[
"Zykunov",
"V. A.",
""
]
] | The Standard Model radiative corrections to the Bhabha scattering process are considered within the one-loop approximation. Both virtual corrections and corrections for the real photon emission are taken into consideration. The calculation was performed at the energy assumed at the Belle II (Japan) facility. |
2301.10811 | Omar Medina | Cesar Bonilla, Johannes Herms, Omar Medina, Eduardo Peinado | Discrete dark matter mechanism as the source of neutrino mass scales | 23 pages, 6 figures and 3 tables. v2: matches published version | JHEP 06 (2023) 078 | 10.1007/JHEP06(2023)078 | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | The hierarchy in scale between atmospheric and solar neutrino mass splittings
is investigated through two distinct neutrino mass mechanisms, from tree- and
one-loop-level contributions. We demonstrate that the minimal discrete dark
matter mechanism contains the ingredients for explaining this hierarchy. This
scenario is characterized by adding new RH neutrinos and scalar
$SU(2)$-doublets to the Standard Model as triplet representations of an $A_4$
flavor symmetry. The $A_4$ symmetry breaking, which occurs at the electroweak
scale, leads to a residual $\mathbb{Z}_2$ symmetry responsible for the dark
matter stability and dictates the neutrino phenomenology. Finally, we show that
to reproduce the neutrino mixing angles correctly it is necessary to violate CP
in the scalar potential.
| [
{
"created": "Wed, 25 Jan 2023 20:05:31 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Jun 2023 16:32:58 GMT",
"version": "v2"
}
] | 2023-06-16 | [
[
"Bonilla",
"Cesar",
""
],
[
"Herms",
"Johannes",
""
],
[
"Medina",
"Omar",
""
],
[
"Peinado",
"Eduardo",
""
]
] | The hierarchy in scale between atmospheric and solar neutrino mass splittings is investigated through two distinct neutrino mass mechanisms, from tree- and one-loop-level contributions. We demonstrate that the minimal discrete dark matter mechanism contains the ingredients for explaining this hierarchy. This scenario is characterized by adding new RH neutrinos and scalar $SU(2)$-doublets to the Standard Model as triplet representations of an $A_4$ flavor symmetry. The $A_4$ symmetry breaking, which occurs at the electroweak scale, leads to a residual $\mathbb{Z}_2$ symmetry responsible for the dark matter stability and dictates the neutrino phenomenology. Finally, we show that to reproduce the neutrino mixing angles correctly it is necessary to violate CP in the scalar potential. |
1509.08720 | Chris Kouvaris | Chris Kouvaris | Earth's Stopping Effect in Directional Dark Matter Detectors | 9 pages, 5 figures | Phys. Rev. D 93, 035023 (2016) | 10.1103/PhysRevD.93.035023 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the stopping effect that results from interactions between dark
matter and nuclei as the dark matter particles travel undergound towards the
detector. Although this effect is negligible for heavy dark matter particles,
there is parameter phase space where the underground interactions of the dark
matter particles with the nuclei can create observable differences in the
spectrum. Dark matter particles that arrive on the detector from below can have
less energy from the ones arriving from above. These differences can be
potentially detectable by upcoming directional detectors. This can unveil a
large amount of information regarding the type and strength of interactions
between nuclei and light dark matter candidates.
| [
{
"created": "Tue, 29 Sep 2015 12:42:51 GMT",
"version": "v1"
}
] | 2016-03-02 | [
[
"Kouvaris",
"Chris",
""
]
] | We explore the stopping effect that results from interactions between dark matter and nuclei as the dark matter particles travel undergound towards the detector. Although this effect is negligible for heavy dark matter particles, there is parameter phase space where the underground interactions of the dark matter particles with the nuclei can create observable differences in the spectrum. Dark matter particles that arrive on the detector from below can have less energy from the ones arriving from above. These differences can be potentially detectable by upcoming directional detectors. This can unveil a large amount of information regarding the type and strength of interactions between nuclei and light dark matter candidates. |
hep-ph/9806458 | Un-Ki Yang | U.K. Yang and A. Bodek | Parton distributions at high x | 7 pages, To be published in proceedings of the 6th International
Workshop on Deep Inelastic Scattering and QCD, Brussels, Apr. 1998 | null | null | UR-1518 | hep-ph | null | We extract the ratio of the down (d) and up (u) parton distribution functions
(PDF's) from the ratio of NMC deuteron and proton structure function
F_2(d)/F_2(p), using corrections for nuclear binding effects in the deuteron,
which are extracted from the nuclear dependence of SLAC F_2 data. Significant
corrections to the d quark distribution in standard PDF's are required,
especially at high x. The corrected d/u ratio is in agreement with the QCD
prediction of 0.2 at x=1. The predictions for the recent CDF W asymmetry data
using PDF's with the corrected d/u ratio give much better agreement at large
rapidity. Using the updated d/u ratio and the most recent world average for
alpha_s, we perform a NLO global fit to all DIS data for F_2 and R, and
estimate the size of the higher twist contributions using both a renormalon
model and an empirical model. We find that with the updated value of alpha_s,
the magnitude of the higher twist terms is half the value of previous analysis.
With the inclusion of target mass and higher twist corrections, the standard
NLO PDF's with the updated d/u ratio describe the SLAC F_2 data up to x=1.0.
When the analysis is repeated in NNLO, we find that the additional NNLO
contributions to R account for most of the higher twist effects extracted in
the NLO fit. The analysis in NNLO indicates that the higher twist effects in R,
F_2 and xF_3 (e.g. GLS sum rule) are very small.
| [
{
"created": "Wed, 24 Jun 1998 00:03:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Yang",
"U. K.",
""
],
[
"Bodek",
"A.",
""
]
] | We extract the ratio of the down (d) and up (u) parton distribution functions (PDF's) from the ratio of NMC deuteron and proton structure function F_2(d)/F_2(p), using corrections for nuclear binding effects in the deuteron, which are extracted from the nuclear dependence of SLAC F_2 data. Significant corrections to the d quark distribution in standard PDF's are required, especially at high x. The corrected d/u ratio is in agreement with the QCD prediction of 0.2 at x=1. The predictions for the recent CDF W asymmetry data using PDF's with the corrected d/u ratio give much better agreement at large rapidity. Using the updated d/u ratio and the most recent world average for alpha_s, we perform a NLO global fit to all DIS data for F_2 and R, and estimate the size of the higher twist contributions using both a renormalon model and an empirical model. We find that with the updated value of alpha_s, the magnitude of the higher twist terms is half the value of previous analysis. With the inclusion of target mass and higher twist corrections, the standard NLO PDF's with the updated d/u ratio describe the SLAC F_2 data up to x=1.0. When the analysis is repeated in NNLO, we find that the additional NNLO contributions to R account for most of the higher twist effects extracted in the NLO fit. The analysis in NNLO indicates that the higher twist effects in R, F_2 and xF_3 (e.g. GLS sum rule) are very small. |
2305.12378 | Mikhail Krivoruchenko | M. I. Krivoruchenko and F. Simkovic | Neutrino Mass Matrix in Neutrino-Related Processes | 19 pages; two references, one footnote added, misprints removed | Physics of Atomic Nuclei, 2023, Vol. 86, No. 5, pp. 709 - 724 | 10.1134/S1063778823050253 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Techniques are developed for constructing amplitudes of neutrino-related
processes in terms of the neutrino mass matrix, with no reference to the
neutrino mixing matrix. The amplitudes of neutrino oscillations in vacuum and
medium, quasi-elastic neutrino scattering, $\beta$ decays and double-$\beta$
decays are considered. The proposed approach makes extensive use of Frobenius
covariants within the framework of Sylvester's theorem on matrix functions. The
in-medium dispersion laws are found in terms of elementary functions for three
flavors of Majorana neutrinos as an application of the developed formalism. The
in-medium dispersion laws for Dirac neutrinos can be determined in the general
case by searching for the roots of a polynomial of degree 6. In the rest frame
of baryon matter, the minimum energy of both Majorana and Dirac neutrinos is
achieved at a finite neutrino momentum. In such cases, Dirac neutrinos occupy a
hollow Fermi sphere at zero temperature and low densities. Fitting experimental
data in terms of the neutrino mass matrix can provide better statistical
accuracy in determining the neutrino mass matrix compared to methods using the
neutrino mixing matrix at intermediate stages.
| [
{
"created": "Sun, 21 May 2023 07:20:07 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Mar 2024 06:10:40 GMT",
"version": "v2"
}
] | 2024-03-07 | [
[
"Krivoruchenko",
"M. I.",
""
],
[
"Simkovic",
"F.",
""
]
] | Techniques are developed for constructing amplitudes of neutrino-related processes in terms of the neutrino mass matrix, with no reference to the neutrino mixing matrix. The amplitudes of neutrino oscillations in vacuum and medium, quasi-elastic neutrino scattering, $\beta$ decays and double-$\beta$ decays are considered. The proposed approach makes extensive use of Frobenius covariants within the framework of Sylvester's theorem on matrix functions. The in-medium dispersion laws are found in terms of elementary functions for three flavors of Majorana neutrinos as an application of the developed formalism. The in-medium dispersion laws for Dirac neutrinos can be determined in the general case by searching for the roots of a polynomial of degree 6. In the rest frame of baryon matter, the minimum energy of both Majorana and Dirac neutrinos is achieved at a finite neutrino momentum. In such cases, Dirac neutrinos occupy a hollow Fermi sphere at zero temperature and low densities. Fitting experimental data in terms of the neutrino mass matrix can provide better statistical accuracy in determining the neutrino mass matrix compared to methods using the neutrino mixing matrix at intermediate stages. |
1506.06949 | Majid Hashemi | Majid Hashemi, Seyyed Mohammad Zebarjad, Hossein Bakhshalizadeh | The t-channel Charged Higgs Production in Single Top Events at LHC | null | Int. J. Theor. Phys. 55 (2016) 2405 | 10.1007/s10773-015-2878-6 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, the t-channel charged Higgs production at LHC is studied.
Production process is a t-channel single top event with charged Higgs exchange.
Therefore the signal is similar with Standard Model single top production in
terms of the final state. In the first step, the signal cross section is
calculated and compared to the other main production processes which are used
for a heavy charged Higgs search at LHC, i.e., pp -> tbH- and pp -> H+ -> tb.
In the next step, an event generation and analysis is applied on signal and
background events, in order to estimate the signal significance. The signal
cross section is typically smaller than the associated production (tbH-) and
resonance production (tb) by a factor of 10-3 and ranges from 10 fb to 1 fb for
charged Higgs mass from 200 to 500 GeV at tanbeta = 50. Due to the small cross
section of signal events and large SM background, the signal significance is
small even after a dedicated kinematic analysis and selection of events,
however, tanbeta values above 120 can be excluded at an integrated luminosity
of 3000 fb-1.
| [
{
"created": "Tue, 23 Jun 2015 11:26:52 GMT",
"version": "v1"
}
] | 2016-04-27 | [
[
"Hashemi",
"Majid",
""
],
[
"Zebarjad",
"Seyyed Mohammad",
""
],
[
"Bakhshalizadeh",
"Hossein",
""
]
] | In this paper, the t-channel charged Higgs production at LHC is studied. Production process is a t-channel single top event with charged Higgs exchange. Therefore the signal is similar with Standard Model single top production in terms of the final state. In the first step, the signal cross section is calculated and compared to the other main production processes which are used for a heavy charged Higgs search at LHC, i.e., pp -> tbH- and pp -> H+ -> tb. In the next step, an event generation and analysis is applied on signal and background events, in order to estimate the signal significance. The signal cross section is typically smaller than the associated production (tbH-) and resonance production (tb) by a factor of 10-3 and ranges from 10 fb to 1 fb for charged Higgs mass from 200 to 500 GeV at tanbeta = 50. Due to the small cross section of signal events and large SM background, the signal significance is small even after a dedicated kinematic analysis and selection of events, however, tanbeta values above 120 can be excluded at an integrated luminosity of 3000 fb-1. |
1108.3428 | Raghavendra Hundi | Dilip Kumar Ghosh and R. S. Hundi | Neutrino masses along with fermion mass hierarchy | 20 pages, the content on results and phenomenology have been
expanded, a new section on UV completion of the model has been added and also
some new references, this version has been accepted by Physical Review D | null | 10.1103/PhysRevD.85.013005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently a new mechanism has been proposed to cure the problem of fermion
mass hierarchy in the Standard Model (SM) model. In this scenario, all SM
charged fermions other than top quark arise from higher dimensional operators
involving the SM Higgs field. This model also predicted some interesting
phenomenology of the Higgs boson. We generalize this model to accommodate
neutrino masses (Dirac & Majorana) and also obtain the mixing pattern in the
leptonic sector. To generate neutrino masses, we add extra three right handed
neutrinos $(N_{iR})$ in this model.
| [
{
"created": "Wed, 17 Aug 2011 09:02:39 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Dec 2011 05:25:33 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Ghosh",
"Dilip Kumar",
""
],
[
"Hundi",
"R. S.",
""
]
] | Recently a new mechanism has been proposed to cure the problem of fermion mass hierarchy in the Standard Model (SM) model. In this scenario, all SM charged fermions other than top quark arise from higher dimensional operators involving the SM Higgs field. This model also predicted some interesting phenomenology of the Higgs boson. We generalize this model to accommodate neutrino masses (Dirac & Majorana) and also obtain the mixing pattern in the leptonic sector. To generate neutrino masses, we add extra three right handed neutrinos $(N_{iR})$ in this model. |
hep-ph/9811353 | Nima Arkani Hamed | Nima Arkani-Hamed and Savas Dimopoulos | New origin for approximate symmetries from distant breaking in extra
dimensions | 29 pages, latex | Phys.Rev. D65 (2002) 052003 | 10.1103/PhysRevD.65.052003 | SLAC-PUB-8008, SU-ITP-98/62 | hep-ph hep-th | null | The recently proposed theories with TeV-scale quantum gravity remove the
usual ultraviolet desert between $\sim 10^{3} - 10^{19}$ GeV where effective
field theory ideas apply. Consequently, the success of the desert in explaining
approximate symmetries is lost, and theories of flavor, neutrino masses, proton
longevity or supersymmetry breaking, lose their usual habitat. In this paper we
show that these ideas can find a new home in an infrared desert: the large
space in the extra dimensions. The main idea is that symmetries are
primordially exact on our brane, but are broken at O(1) on distant branes. This
breaking is communicated to us in a distance-suppressed way by bulk messengers.
We illustrate these ideas in a number of settings: 1) We construct theories for
the fermion mass hierarchy which avoid large FCNC's. 2) We re-iterate that
proton stability can arise if baryon number is gauged in the bulk. 3) We study
experimental constraints on light gauge fields and scalars in the bulk. 4) We
remark that the same ideas can be used to explain small neutrino masses, and
hierarchical supersymmetry breaking. 5) We construct a theory with bulk
technicolor, avoiding the difficulties with extended technicolor. There are
also interesting experimental signals of these ideas: 1) Attractive or
repulsive, isotope dependent sub-millimeter forces $\sim 10^6$ times
gravitational strength, from the exchange of light bulk particles. 2) Novel
Higgs decays to light generation fermions plus bulk scalars. 3) Collider
production of bulk vector and scalar fields, leading to large $\gamma$ or jet+
missing energy signals.
| [
{
"created": "Mon, 16 Nov 1998 21:19:36 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Arkani-Hamed",
"Nima",
""
],
[
"Dimopoulos",
"Savas",
""
]
] | The recently proposed theories with TeV-scale quantum gravity remove the usual ultraviolet desert between $\sim 10^{3} - 10^{19}$ GeV where effective field theory ideas apply. Consequently, the success of the desert in explaining approximate symmetries is lost, and theories of flavor, neutrino masses, proton longevity or supersymmetry breaking, lose their usual habitat. In this paper we show that these ideas can find a new home in an infrared desert: the large space in the extra dimensions. The main idea is that symmetries are primordially exact on our brane, but are broken at O(1) on distant branes. This breaking is communicated to us in a distance-suppressed way by bulk messengers. We illustrate these ideas in a number of settings: 1) We construct theories for the fermion mass hierarchy which avoid large FCNC's. 2) We re-iterate that proton stability can arise if baryon number is gauged in the bulk. 3) We study experimental constraints on light gauge fields and scalars in the bulk. 4) We remark that the same ideas can be used to explain small neutrino masses, and hierarchical supersymmetry breaking. 5) We construct a theory with bulk technicolor, avoiding the difficulties with extended technicolor. There are also interesting experimental signals of these ideas: 1) Attractive or repulsive, isotope dependent sub-millimeter forces $\sim 10^6$ times gravitational strength, from the exchange of light bulk particles. 2) Novel Higgs decays to light generation fermions plus bulk scalars. 3) Collider production of bulk vector and scalar fields, leading to large $\gamma$ or jet+ missing energy signals. |
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