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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9506284 | Jim Cline | James M. Cline (McGill University), Kimmo Kainulainen (CERN), Axel P.
Vischer (University of Minnesota) | Dynamics of Two Higgs Doublet CP Violation and Baryogenesis at the
Electroweak Phase Transition | 49 pp. latex, 6 figures; section on diffusion expanded and corrected,
published version | Phys.Rev. D54 (1996) 2451-2472 | 10.1103/PhysRevD.54.2451 | McGill/95-16, CERN-TH-95/136, UMN-TH-1343-94 | hep-ph | null | We quantitatively study the charge transport mechanism of electroweak
baryogenesis in a realistic two-Higgs-doublet model, comparing the
contributions from quarks and leptons reflecting from electroweak domain walls,
and comparing the exact profile of the CP-violating phase with a commonly used
ansatz. We note that the phenomenon of spontaneous CP violation at high
temperature can occur in this model, even when there is no CP violation at zero
temperature. We include all known effects which are likely to influence the
baryon production rate, including strong sphalerons, the nontrivial dispersion
relations of the quasiparticles in the plasma, and Debye screening of gauged
charges. We confirm the claim of Joyce, Prokopec and Turok that the reflection
of tau leptons from the wall gives the dominant effect. We conclude that this
mechanism is marginally strong enough to produce the observed baryon asymmetry
of the universe.
| [
{
"created": "Fri, 9 Jun 1995 20:49:55 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Jun 1995 10:52:08 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Jun 1995 12:47:38 GMT",
"version": "v3"
},
{
"created": "Fri, 19 Jun 1998 13:43:16 GMT",
"version": "v4"
}
] | 2009-10-28 | [
[
"Cline",
"James M.",
"",
"McGill University"
],
[
"Kainulainen",
"Kimmo",
"",
"CERN"
],
[
"Vischer",
"Axel P.",
"",
"University of Minnesota"
]
] | We quantitatively study the charge transport mechanism of electroweak baryogenesis in a realistic two-Higgs-doublet model, comparing the contributions from quarks and leptons reflecting from electroweak domain walls, and comparing the exact profile of the CP-violating phase with a commonly used ansatz. We note that the phenomenon of spontaneous CP violation at high temperature can occur in this model, even when there is no CP violation at zero temperature. We include all known effects which are likely to influence the baryon production rate, including strong sphalerons, the nontrivial dispersion relations of the quasiparticles in the plasma, and Debye screening of gauged charges. We confirm the claim of Joyce, Prokopec and Turok that the reflection of tau leptons from the wall gives the dominant effect. We conclude that this mechanism is marginally strong enough to produce the observed baryon asymmetry of the universe. |
2208.14943 | James Brandenburg | James Daniel Brandenburg, Janet Seger, Zhangbu Xu, Wangmei Zha | Report on Progress in Physics: Observation of the Breit-Wheeler Process
and Vacuum Birefringence in Heavy-Ion Collisions | null | null | 10.1088/1361-6633/acdae4 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This Report reviews the effort over several decades to observe the linear
Breit-Wheeler process ($\gamma\gamma \rightarrow e^+e^-$) and vacuum
birefringence in high-energy particle and heavy-ion collider experiment. This
Report, motivated by STAR's recent observations, attempts to summarize the key
issues related to the interpretation of polarized $\gamma\gamma \rightarrow
l^+l^-$ measurements in high-energy experiments. To that end, we start by
reviewing the historical context and essential theoretical developments, before
focusing on the decades of progress made in high-energy collider experiments.
Special attention is given to the evolution in experimental approaches in
response to various challenges and the demanding detector capabilities required
to unambiguously identify the linear Breit-Wheeler process and to detect the
signatures of vacuum birefringence. We close the report with a discussion,
followed by a look at near-future opportunities for utilizing these discoveries
and for testing QED in previously unexplored regimes.
| [
{
"created": "Wed, 31 Aug 2022 16:23:56 GMT",
"version": "v1"
}
] | 2023-07-05 | [
[
"Brandenburg",
"James Daniel",
""
],
[
"Seger",
"Janet",
""
],
[
"Xu",
"Zhangbu",
""
],
[
"Zha",
"Wangmei",
""
]
] | This Report reviews the effort over several decades to observe the linear Breit-Wheeler process ($\gamma\gamma \rightarrow e^+e^-$) and vacuum birefringence in high-energy particle and heavy-ion collider experiment. This Report, motivated by STAR's recent observations, attempts to summarize the key issues related to the interpretation of polarized $\gamma\gamma \rightarrow l^+l^-$ measurements in high-energy experiments. To that end, we start by reviewing the historical context and essential theoretical developments, before focusing on the decades of progress made in high-energy collider experiments. Special attention is given to the evolution in experimental approaches in response to various challenges and the demanding detector capabilities required to unambiguously identify the linear Breit-Wheeler process and to detect the signatures of vacuum birefringence. We close the report with a discussion, followed by a look at near-future opportunities for utilizing these discoveries and for testing QED in previously unexplored regimes. |
0910.3147 | Massimo Mannarelli | Massimo Mannarelli and Floriana Giannuzzi | Decay widths of charmonia in a hot equilibrated medium | 6 pages, 2 figures, contribution to the conference Three Days of
Strong Interactions, Wroclaw (Poland) 9. - 11. VII. 2009 | Acta Phys.Polon.Supp.3:759-764,2010 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the properties of charmonia in a thermal medium, showing that
with increasing temperature the decay widths of these mesons behave in a
non-trivial way. Employing a potential model with interaction potential
extracted from thermal lattice QCD calculations of the free-energy of a static
quark-antiquark pair, we study some decay processes in the crossover region. We
find that at temperatures $T \sim T_c$ the decay widths of the $J/\Psi$ that
depend on the value of the wave function at the origin are enhanced with
respect to the values in vacuum. In the same temperature range the decay width
of the process $\chi_{cJ} \to J/\Psi + \gamma$ is enhanced by approximately a
factor 6 with respect to the value in vacuum. At higher temperatures the
charmonia states dissociate and the widths of both decay processes become
vanishing small.
| [
{
"created": "Fri, 16 Oct 2009 15:52:00 GMT",
"version": "v1"
}
] | 2010-11-02 | [
[
"Mannarelli",
"Massimo",
""
],
[
"Giannuzzi",
"Floriana",
""
]
] | We investigate the properties of charmonia in a thermal medium, showing that with increasing temperature the decay widths of these mesons behave in a non-trivial way. Employing a potential model with interaction potential extracted from thermal lattice QCD calculations of the free-energy of a static quark-antiquark pair, we study some decay processes in the crossover region. We find that at temperatures $T \sim T_c$ the decay widths of the $J/\Psi$ that depend on the value of the wave function at the origin are enhanced with respect to the values in vacuum. In the same temperature range the decay width of the process $\chi_{cJ} \to J/\Psi + \gamma$ is enhanced by approximately a factor 6 with respect to the value in vacuum. At higher temperatures the charmonia states dissociate and the widths of both decay processes become vanishing small. |
2310.18221 | Stefano Di Noi | Stefano Di Noi, Ramona Gr\"ober, Gudrun Heinrich, Jannis Lang, Marco
Vitti | On $\gamma_5$ schemes and the interplay of SMEFT operators in the
Higgs-gluon coupling | null | null | null | P3H-23-080, KA-TP-22-2023, TTP23-054 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the four-top quark operator contributions to Higgs production
via gluon fusion in the Standard Model Effective Field Theory. The four-top
operators enter for the first time via two-loop diagrams. Due to their chiral
structure they contain $\gamma_5$, so special care needs to be taken when using
dimensional regularisation for the loop integrals. We use two different schemes
for the continuation of $\gamma_5$ to $D$ space-time dimensions in our
calculations and present a mapping for the parameters in the two schemes. This
generically leads to an interplay of different operators, such as four-top
operators, chromomagnetic operators or Yukawa-type operators at the loop level.
We validate our results by examples of matching onto UV models.
| [
{
"created": "Fri, 27 Oct 2023 15:50:31 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Nov 2023 16:25:39 GMT",
"version": "v2"
},
{
"created": "Mon, 25 Mar 2024 15:04:48 GMT",
"version": "v3"
}
] | 2024-03-26 | [
[
"Di Noi",
"Stefano",
""
],
[
"Gröber",
"Ramona",
""
],
[
"Heinrich",
"Gudrun",
""
],
[
"Lang",
"Jannis",
""
],
[
"Vitti",
"Marco",
""
]
] | We calculate the four-top quark operator contributions to Higgs production via gluon fusion in the Standard Model Effective Field Theory. The four-top operators enter for the first time via two-loop diagrams. Due to their chiral structure they contain $\gamma_5$, so special care needs to be taken when using dimensional regularisation for the loop integrals. We use two different schemes for the continuation of $\gamma_5$ to $D$ space-time dimensions in our calculations and present a mapping for the parameters in the two schemes. This generically leads to an interplay of different operators, such as four-top operators, chromomagnetic operators or Yukawa-type operators at the loop level. We validate our results by examples of matching onto UV models. |
hep-ph/9409413 | Toshihiro Kouno | T.Inagaki, T.Kouno and T.Muta | Phase Structure of Four-Fermion Theories at Finite Temperature and
Chemical Potential in Arbitrary Dimensions | 32 pages, uses LaTeX, here.sty(attached), eepic.sty, HUPD-9402 (some
misprints corrected) | Int.J.Mod.Phys. A10 (1995) 2241-2268 | 10.1142/S0217751X95001091 | null | hep-ph hep-th | null | The phase structure of four-fermion theories is thoroughly investigated with
varying temperature and chemical potential for arbitrary space-time dimensions
$(2 \leq D < 4)$ by using the 1/N expansion method. It is shown that the chiral
symmetry is restored in the theory under consideration for sufficiently high
temperature and/or chemical potential. The critical line dividing the symmetric
and broken phase is given explicitly. It is found that for space-time dimension
$2 \leq D < 3$ both the first-order and second-order phase transition occur
depending on the value of temperature and chemical potential while for $3 \leq
D < 4$ only the second-order phase transition exists.
| [
{
"created": "Mon, 26 Sep 1994 14:47:46 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Oct 1994 11:22:31 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Inagaki",
"T.",
""
],
[
"Kouno",
"T.",
""
],
[
"Muta",
"T.",
""
]
] | The phase structure of four-fermion theories is thoroughly investigated with varying temperature and chemical potential for arbitrary space-time dimensions $(2 \leq D < 4)$ by using the 1/N expansion method. It is shown that the chiral symmetry is restored in the theory under consideration for sufficiently high temperature and/or chemical potential. The critical line dividing the symmetric and broken phase is given explicitly. It is found that for space-time dimension $2 \leq D < 3$ both the first-order and second-order phase transition occur depending on the value of temperature and chemical potential while for $3 \leq D < 4$ only the second-order phase transition exists. |
1701.01554 | Mikko Laine | Mikko Laine and Aleksi Vuorinen | Basics of thermal field theory -- a tutorial on perturbative
computations | 228 pages. v2: streamlines and additions | Lect. Notes Phys. 925 (2016) pp.1-281 | 10.1007/978-3-319-31933-9 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | These lecture notes, suitable for a two-semester introductory course or
self-study, offer an elementary and self-contained exposition of the basic
tools and concepts that are encountered in practical computations in
perturbative thermal field theory. Selected applications to heavy ion collision
physics and cosmology are outlined in the last chapter.
| [
{
"created": "Fri, 6 Jan 2017 06:39:49 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jan 2022 16:57:11 GMT",
"version": "v2"
}
] | 2022-01-17 | [
[
"Laine",
"Mikko",
""
],
[
"Vuorinen",
"Aleksi",
""
]
] | These lecture notes, suitable for a two-semester introductory course or self-study, offer an elementary and self-contained exposition of the basic tools and concepts that are encountered in practical computations in perturbative thermal field theory. Selected applications to heavy ion collision physics and cosmology are outlined in the last chapter. |
1009.5856 | Rumyantsev Dmitry Alexandrovich | N.V. Mikheev, D.A. Rumyantsev, Yu.E. Shkol'nikova (Yaroslavl State
(P.G. Demidov) University, Russia) | Resonant $\gamma \to a$ transition in magnetar magnitosphere | 6 pages, 3 figures, talk presented at the Quarks 2010 seminar, 6-12
July, 2010, Kolomna | null | null | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effect of a magnetized plasma on the resonant photoproduction of axions
on the electromagnetic multipole components of the medium, $i \to f+a$, has
been considered. It has been shown that the axion resonant emissivity, due to
various reactions involving particles of the medium, is naturally expressed in
terms of the emissivity of the photon $\to$ axion transition. The number of
axions produced by the equilibrium cosmic microwave background radiation in the
magnetar magnetosphere has been calculated. It has been shown that the resonant
mechanism under consideration is inefficient for the production of cold dark
mass.
| [
{
"created": "Wed, 29 Sep 2010 12:01:22 GMT",
"version": "v1"
}
] | 2010-09-30 | [
[
"Mikheev",
"N. V.",
"",
"Yaroslavl State"
],
[
"Rumyantsev",
"D. A.",
"",
"Yaroslavl State"
],
[
"Shkol'nikova",
"Yu. E.",
"",
"Yaroslavl State"
]
] | The effect of a magnetized plasma on the resonant photoproduction of axions on the electromagnetic multipole components of the medium, $i \to f+a$, has been considered. It has been shown that the axion resonant emissivity, due to various reactions involving particles of the medium, is naturally expressed in terms of the emissivity of the photon $\to$ axion transition. The number of axions produced by the equilibrium cosmic microwave background radiation in the magnetar magnetosphere has been calculated. It has been shown that the resonant mechanism under consideration is inefficient for the production of cold dark mass. |
2312.00665 | Fabrizio Murgana | Fabrizio Murgana, Vincenzo Greco, Marco Ruggieri, Dario Zappal\`a | Functional Renormalization Group Study of Thermodynamic Geometry Around
the Phase Transition of Quantum Chromodynamic | 12 pages, 6 figures | null | null | null | hep-ph cond-mat.stat-mech hep-th nucl-th | http://creativecommons.org/publicdomain/zero/1.0/ | We investigate the thermodynamic geometry of the quark-meson model at finite
temperature, $T$, and quark number chemical potential, $\mu$. We extend
previous works by the inclusion of fluctuations exploiting the functional
renormalization group approach. We use recent developments to recast the flow
equation into the form of an advection-diffusion equation. We adopt the local
potential approximation for the effective average action. We focus on the
thermodynamic curvature, $R$, in the $(\mu,T)$ plane, in proximity of the
chiral crossover, up to the critical point of the phase diagram. We find that
the inclusion of fluctuations results in a smoother behavior of $R$ near the
chiral crossover. Moreover, for small $\mu$, $R$ remains negative, signaling
the fact that bosonic fluctuations reduce the capability of the system to
completely overcome the fermionic statistical repulsion of the quarks. We
investigate in more detail the small $\mu$ region by analyzing a system in
which we artificially lower the pion mass, thus approaching the chiral limit in
which the crossover is actually a second order phase transition. On the other
hand, as $\mu$ is increased and the critical point is approached, we find that
$R$ is enhanced and a sign change occurs, in agreement with mean field studies.
Hence, we completely support the picture that $R$ is sensitive to a crossover
and a phase transition, and provides information about the effective behavior
of the system at the phase transition.
| [
{
"created": "Fri, 1 Dec 2023 15:47:26 GMT",
"version": "v1"
}
] | 2023-12-04 | [
[
"Murgana",
"Fabrizio",
""
],
[
"Greco",
"Vincenzo",
""
],
[
"Ruggieri",
"Marco",
""
],
[
"Zappalà",
"Dario",
""
]
] | We investigate the thermodynamic geometry of the quark-meson model at finite temperature, $T$, and quark number chemical potential, $\mu$. We extend previous works by the inclusion of fluctuations exploiting the functional renormalization group approach. We use recent developments to recast the flow equation into the form of an advection-diffusion equation. We adopt the local potential approximation for the effective average action. We focus on the thermodynamic curvature, $R$, in the $(\mu,T)$ plane, in proximity of the chiral crossover, up to the critical point of the phase diagram. We find that the inclusion of fluctuations results in a smoother behavior of $R$ near the chiral crossover. Moreover, for small $\mu$, $R$ remains negative, signaling the fact that bosonic fluctuations reduce the capability of the system to completely overcome the fermionic statistical repulsion of the quarks. We investigate in more detail the small $\mu$ region by analyzing a system in which we artificially lower the pion mass, thus approaching the chiral limit in which the crossover is actually a second order phase transition. On the other hand, as $\mu$ is increased and the critical point is approached, we find that $R$ is enhanced and a sign change occurs, in agreement with mean field studies. Hence, we completely support the picture that $R$ is sensitive to a crossover and a phase transition, and provides information about the effective behavior of the system at the phase transition. |
1309.4738 | Roman Nevzorov | R. Nevzorov | Quasi-fixed point scenarios and the Higgs mass in the E6 inspired SUSY
models | 30 pages, 2 figures, some minor changes to the text, references added | Phys. Rev. D 89, 055010 (2014) | 10.1103/PhysRevD.89.055010 | ADP-14-7/T865 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the two-loop renormalization group (RG) flow of the gauge and
Yukawa couplings within the E6 inspired supersymmetric (SUSY) models with extra
U(1)_{N} gauge symmetry under which right-handed neutrinos have zero charge. In
these models single discrete \tilde{Z}^{H}_2 symmetry forbids the tree-level
flavor-changing transitions and the most dangerous baryon and lepton number
violating operators. We consider two different scenarios A and B that involve
extra matter beyond the MSSM contained in three and four 5+\overline{5}
representations of SU(5) respectively plus three SU(5) singlets which carry
U(1)_{N} charges. In the scenario A the measured values of the SU(2)_W and
U(1)_Y gauge couplings lie near the fixed points of the RG equations. In the
scenario B the contribution of two--loop corrections spoils the unification of
gauge couplings resulting in the appearance of the Landau pole below the Grand
Unification scale M_X. The solutions for the Yukawa couplings also approach the
quasi fixed points with increasing their values at the scale M_X. We calculate
the two--loop upper bounds on the lightest Higgs boson mass in the vicinity of
these quasi fixed points and compare the results of our analysis with the
corresponding ones in the NMSSM. In all these cases the theoretical
restrictions on the SM--like Higgs boson mass are rather close to 125 GeV.
| [
{
"created": "Wed, 18 Sep 2013 18:32:27 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Sep 2013 18:37:15 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Mar 2014 03:52:36 GMT",
"version": "v3"
}
] | 2014-03-26 | [
[
"Nevzorov",
"R.",
""
]
] | We analyse the two-loop renormalization group (RG) flow of the gauge and Yukawa couplings within the E6 inspired supersymmetric (SUSY) models with extra U(1)_{N} gauge symmetry under which right-handed neutrinos have zero charge. In these models single discrete \tilde{Z}^{H}_2 symmetry forbids the tree-level flavor-changing transitions and the most dangerous baryon and lepton number violating operators. We consider two different scenarios A and B that involve extra matter beyond the MSSM contained in three and four 5+\overline{5} representations of SU(5) respectively plus three SU(5) singlets which carry U(1)_{N} charges. In the scenario A the measured values of the SU(2)_W and U(1)_Y gauge couplings lie near the fixed points of the RG equations. In the scenario B the contribution of two--loop corrections spoils the unification of gauge couplings resulting in the appearance of the Landau pole below the Grand Unification scale M_X. The solutions for the Yukawa couplings also approach the quasi fixed points with increasing their values at the scale M_X. We calculate the two--loop upper bounds on the lightest Higgs boson mass in the vicinity of these quasi fixed points and compare the results of our analysis with the corresponding ones in the NMSSM. In all these cases the theoretical restrictions on the SM--like Higgs boson mass are rather close to 125 GeV. |
hep-ph/0102134 | Matteo Cacciari | M. Cacciari, S. Frixione and P. Nason | The p_T Spectrum in Heavy-Flavour Photoproduction | 26 pages, Latex, epsfig, 15 figures. Submitted to JHEP | JHEP 0103:006,2001 | 10.1088/1126-6708/2001/03/006 | Bicocca-FT-01-01, GEF/TH-2-01, YITP-SB-01-01 | hep-ph | null | We consider the transverse-momentum distribution of heavy flavours in
photon-hadron collisions. We present a formalism in which large
transverse-momentum logarithms are resummed to the next-to-leading level, and
mass effects are included exactly up to order alpha_em alpha_s^2, so as to
retain predictivity at both small and large transverse momenta.
Phenomenological applications relevant to charm photoproduction at HERA are
given.
| [
{
"created": "Mon, 12 Feb 2001 13:42:44 GMT",
"version": "v1"
}
] | 2010-02-03 | [
[
"Cacciari",
"M.",
""
],
[
"Frixione",
"S.",
""
],
[
"Nason",
"P.",
""
]
] | We consider the transverse-momentum distribution of heavy flavours in photon-hadron collisions. We present a formalism in which large transverse-momentum logarithms are resummed to the next-to-leading level, and mass effects are included exactly up to order alpha_em alpha_s^2, so as to retain predictivity at both small and large transverse momenta. Phenomenological applications relevant to charm photoproduction at HERA are given. |
0709.3935 | Paul Jameson | Paul Jameson | Infrared Divergences from Soft and Collinear Gauge Bosons | 6 pages, 6 .jpg figures. Talk given at the Ninth Workshop on
Non-Perturbative QCD, Paris, June 2007 | ECONFC0706044:27,2007 | null | null | hep-ph | null | I review the Lee-Nauenberg thereom and discuss its inclusion of photons which
are disconnected at the level of the S-matrix but connected at the level of the
cross-section when there are initial and final state charged particles. I then
expose a new set of soft collinear divergences in massless gauge theories which
are omitted in the standard Lee-Nauenberg approach. It seems that highly
questionable assumptions are needed to obtain finite cross-sections.
| [
{
"created": "Tue, 25 Sep 2007 12:51:54 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Jameson",
"Paul",
""
]
] | I review the Lee-Nauenberg thereom and discuss its inclusion of photons which are disconnected at the level of the S-matrix but connected at the level of the cross-section when there are initial and final state charged particles. I then expose a new set of soft collinear divergences in massless gauge theories which are omitted in the standard Lee-Nauenberg approach. It seems that highly questionable assumptions are needed to obtain finite cross-sections. |
1507.03533 | Ibrahim Elmashad Mr. | L. I. AbouSalem, N. M. El Naggar and I. A. Elmashad | The Quark-Gluon Plasma Equation of State and The Generalized Uncertainty
Principle | 9 Pages, 8 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quark-gluon plasma (QGP) equation of state within a minimal length
scenario or Generalized Uncertainty Principle (GUP) is studied. The Generalized
Uncertainty Principle is implemented on deriving the thermodynamics of ideal
QGP at a vanishing chemical potential. We find a significant effect for the GUP
term. The main features of QCD lattice results were quantitatively achieved in
case of $n_{f}=0$, $n_{f}=2$ and $n_{f}=2+1$ flavors for the energy density,
the pressure and the interaction measure. The exciting point is the large value
of bag pressure especially in case of $n_{f}=2+1$ flavor which reflects the
strong correlation between quarks in this bag which is already expected. One
can notice that, the asymptotic behavior which is characterized by
Stephan-Boltzmann limit would be satisfied.
| [
{
"created": "Mon, 13 Jul 2015 17:50:16 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Sep 2015 09:57:27 GMT",
"version": "v2"
}
] | 2015-10-01 | [
[
"AbouSalem",
"L. I.",
""
],
[
"Naggar",
"N. M. El",
""
],
[
"Elmashad",
"I. A.",
""
]
] | The quark-gluon plasma (QGP) equation of state within a minimal length scenario or Generalized Uncertainty Principle (GUP) is studied. The Generalized Uncertainty Principle is implemented on deriving the thermodynamics of ideal QGP at a vanishing chemical potential. We find a significant effect for the GUP term. The main features of QCD lattice results were quantitatively achieved in case of $n_{f}=0$, $n_{f}=2$ and $n_{f}=2+1$ flavors for the energy density, the pressure and the interaction measure. The exciting point is the large value of bag pressure especially in case of $n_{f}=2+1$ flavor which reflects the strong correlation between quarks in this bag which is already expected. One can notice that, the asymptotic behavior which is characterized by Stephan-Boltzmann limit would be satisfied. |
hep-ph/0511102 | Andre Hoang | Andre H. Hoang and Pedro Ruiz-Femenia | Renormalization Group Analysis in NRQCD for Colored Scalars | 19 pages, 8 figures; revtex4. References added; version to appear in
Phys. Rev. D | Phys.Rev. D73 (2006) 014015 | 10.1103/PhysRevD.73.014015 | MPP-2005-130 | hep-ph | null | The vNRQCD Lagrangian for colored heavy scalar fields in the fundamental
representation of QCD and the renormalization group analysis of the
corresponding operators are presented. The results are an important ingredient
for renormalization group improved computations of scalar-antiscalar bound
state energies and production rates at next-to-next-to-leading-logarithmic
(NNLL) order.
| [
{
"created": "Tue, 8 Nov 2005 21:00:22 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Jan 2006 16:29:01 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Hoang",
"Andre H.",
""
],
[
"Ruiz-Femenia",
"Pedro",
""
]
] | The vNRQCD Lagrangian for colored heavy scalar fields in the fundamental representation of QCD and the renormalization group analysis of the corresponding operators are presented. The results are an important ingredient for renormalization group improved computations of scalar-antiscalar bound state energies and production rates at next-to-next-to-leading-logarithmic (NNLL) order. |
0911.1175 | Katsuji Yamamoto | Katsuichi Higuchi, Katsuji Yamamoto | Flavor-changing interactions with singlet quarks and their implications
for the LHC | 32 pages, 8 figures | Phys.Rev.D81:015009,2010 | 10.1103/PhysRevD.81.015009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the flavor-changing interactions in an extension of the
standard model with singlet quarks and singlet Higgs, which are induced by the
mixing between the ordinary quarks and the singlet quarks ($ q $-$ Q $ mixing).
We consider the effects of the gauge and scalar interactions in the $ \Delta F
= 2 $ mixings of $ K^0 $, $ B_d $, $ B_s $ and $ D^0 $ mesons to show the
currently allowed range of the $ q $-$ Q $ mixing. Then, we investigate the new
physics around the electroweak scale to the TeV scale, which is accessible to
the Large Hadron Collider. Especially, the scalar coupling mediated by the
singlet Higgs may provide distinct signatures for the decays of the singlet
quarks and Higgs particles, which should be compared with the conventionally
expected ones via the gauge and standard Higgs couplings. Observations of the
singlet quarks and Higgs particles will present us important insights on the $
q $-$ Q $ mixing and Higgs mixing.
| [
{
"created": "Fri, 6 Nov 2009 06:09:38 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Higuchi",
"Katsuichi",
""
],
[
"Yamamoto",
"Katsuji",
""
]
] | We investigate the flavor-changing interactions in an extension of the standard model with singlet quarks and singlet Higgs, which are induced by the mixing between the ordinary quarks and the singlet quarks ($ q $-$ Q $ mixing). We consider the effects of the gauge and scalar interactions in the $ \Delta F = 2 $ mixings of $ K^0 $, $ B_d $, $ B_s $ and $ D^0 $ mesons to show the currently allowed range of the $ q $-$ Q $ mixing. Then, we investigate the new physics around the electroweak scale to the TeV scale, which is accessible to the Large Hadron Collider. Especially, the scalar coupling mediated by the singlet Higgs may provide distinct signatures for the decays of the singlet quarks and Higgs particles, which should be compared with the conventionally expected ones via the gauge and standard Higgs couplings. Observations of the singlet quarks and Higgs particles will present us important insights on the $ q $-$ Q $ mixing and Higgs mixing. |
hep-ph/0112318 | Robert Bluhm | R. Bluhm | Electromagnetic Tests of Lorentz and CPT Symmetry | 10 pages, talk presented at the Workshop on Electromagnetic Probes of
Fundamental Physics, Erice, Sicily, October, 2001 | null | null | null | hep-ph | null | A review is presented of some recent Lorentz and CPT tests in atomic and
particle systems where the predominant interactions are described by quantum
electrodynamics. A theoretical framework extending QED in the context of the
standard model is used to analyze these systems. Experimental signatures of
possible Lorentz and CPT violation are investigated, and bounds are discussed.
| [
{
"created": "Sun, 23 Dec 2001 18:28:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bluhm",
"R.",
""
]
] | A review is presented of some recent Lorentz and CPT tests in atomic and particle systems where the predominant interactions are described by quantum electrodynamics. A theoretical framework extending QED in the context of the standard model is used to analyze these systems. Experimental signatures of possible Lorentz and CPT violation are investigated, and bounds are discussed. |
2310.20681 | Biswajit Karmakar | Garv Chauhan, P. S. Bhupal Dev, Ievgen Dubovyk, Bartosz Dziewit,
Wojciech Flieger, Krzysztof Grzanka, Janusz Gluza, Biswajit Karmakar, Szymon
Zi\k{e}ba | Phenomenology of Lepton Masses and Mixing with Discrete Flavor
Symmetries | This version is accepted for publication in Progress in Particle and
Nuclear Physics | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The observed pattern of fermion masses and mixing is an outstanding puzzle in
particle physics, generally known as the flavor problem. Over the years, guided
by precision neutrino oscillation data, discrete flavor symmetries have often
been used to explain the neutrino mixing parameters, which look very different
from the quark sector. In this review, we discuss the application of
non-Abelian finite groups to the theory of neutrino masses and mixing in the
light of current and future neutrino oscillation data. We start with an
overview of the neutrino mixing parameters, comparing different global fit
results and limits on normal and inverted neutrino mass ordering schemes. Then,
we discuss a general framework for implementing discrete family symmetries to
explain neutrino masses and mixing. We discuss CP violation effects, giving an
update of CP predictions for trimaximal models with nonzero reactor mixing
angle and models with partial $\mu-\tau$ reflection symmetry, and constraining
models with neutrino mass sum rules. The connection between texture zeroes and
discrete symmetries is also discussed. We summarize viable higher-order groups,
which can explain the observed pattern of lepton mixing where the non-zero
$\theta_{13}$ plays an important role. We also review the prospects of
embedding finite discrete symmetries in the Grand Unified Theories and with
extended Higgs fields. Models based on modular symmetry are also briefly
discussed. A major part of the review is dedicated to the phenomenology of
flavor symmetries and possible signatures in the current and future experiments
at the intensity, energy, and cosmic frontiers. In this context, we discuss
flavor symmetry implications for neutrinoless double beta decay, collider
signals, leptogenesis, dark matter, as well as gravitational waves.
| [
{
"created": "Tue, 31 Oct 2023 17:47:19 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Mar 2024 17:14:49 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Jun 2024 09:13:01 GMT",
"version": "v3"
}
] | 2024-06-04 | [
[
"Chauhan",
"Garv",
""
],
[
"Dev",
"P. S. Bhupal",
""
],
[
"Dubovyk",
"Ievgen",
""
],
[
"Dziewit",
"Bartosz",
""
],
[
"Flieger",
"Wojciech",
""
],
[
"Grzanka",
"Krzysztof",
""
],
[
"Gluza",
"Janusz",
""
],... | The observed pattern of fermion masses and mixing is an outstanding puzzle in particle physics, generally known as the flavor problem. Over the years, guided by precision neutrino oscillation data, discrete flavor symmetries have often been used to explain the neutrino mixing parameters, which look very different from the quark sector. In this review, we discuss the application of non-Abelian finite groups to the theory of neutrino masses and mixing in the light of current and future neutrino oscillation data. We start with an overview of the neutrino mixing parameters, comparing different global fit results and limits on normal and inverted neutrino mass ordering schemes. Then, we discuss a general framework for implementing discrete family symmetries to explain neutrino masses and mixing. We discuss CP violation effects, giving an update of CP predictions for trimaximal models with nonzero reactor mixing angle and models with partial $\mu-\tau$ reflection symmetry, and constraining models with neutrino mass sum rules. The connection between texture zeroes and discrete symmetries is also discussed. We summarize viable higher-order groups, which can explain the observed pattern of lepton mixing where the non-zero $\theta_{13}$ plays an important role. We also review the prospects of embedding finite discrete symmetries in the Grand Unified Theories and with extended Higgs fields. Models based on modular symmetry are also briefly discussed. A major part of the review is dedicated to the phenomenology of flavor symmetries and possible signatures in the current and future experiments at the intensity, energy, and cosmic frontiers. In this context, we discuss flavor symmetry implications for neutrinoless double beta decay, collider signals, leptogenesis, dark matter, as well as gravitational waves. |
hep-ph/9911521 | Hector DE Vega | D. Boyanovsky and H. J. de Vega | Dynamics of Symmetry Breaking in FRW Cosmologies: Emergence of Scaling | LaTex, 39 pages, 11 .ps figures | Phys.Rev. D61 (2000) 105014 | 10.1103/PhysRevD.61.105014 | null | hep-ph astro-ph gr-qc hep-th | null | The dynamics of a symmetry breaking phase transition is studied in a
radiation and matter dominated spatially flat FRW cosmology in the large N
limit of a scalar field theory.The quantum density matrix is evolved from an
initial state of quasiparticles in thermal equilibrium at a temperature higher
than the critical. The cosmological expansion decreases the temperature and
triggers the phase transition. We identify three different time scales: an
early regime dominated by linear instabilities and the exponential growth of
long-wavelength fluctuations,an intermediate scale when the field fluctuations
probe the broken symmetry states and an asymptotic scale wherein a scaling
regime emerges for modes of wavelength comparable to or larger than the
horizon.The scaling regime is characterized by a dynamical physical correlation
length xi_{phys} = d_H(t) with d_H(t) the size of the causal horizon, thus
there is one correlated region per causal horizon. Inside these correlated
regions the field fluctuations sample the broken symmetry states. The amplitude
of the long-wavelength fluctuations becomes non-perturbatively large due to the
early times instabilities and a semiclassical but stochastic description
emerges in the asymptotic regime. In the scaling regime, the power spectrum is
peaked at zero momentum revealing the onset of a Bose-Einstein condensate.The
scaling solution results in that the equation of state of the scalar fields is
the same as that of the background fluid. This implies a Harrison-Zeldovich
spectrum of scalar density perturbations for long-wavelengths. We discuss the
corrections to scaling as well as the universality of the scaling solution and
the differences and similarities with the classical non-linear sigma model.
| [
{
"created": "Mon, 29 Nov 1999 16:39:16 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Boyanovsky",
"D.",
""
],
[
"de Vega",
"H. J.",
""
]
] | The dynamics of a symmetry breaking phase transition is studied in a radiation and matter dominated spatially flat FRW cosmology in the large N limit of a scalar field theory.The quantum density matrix is evolved from an initial state of quasiparticles in thermal equilibrium at a temperature higher than the critical. The cosmological expansion decreases the temperature and triggers the phase transition. We identify three different time scales: an early regime dominated by linear instabilities and the exponential growth of long-wavelength fluctuations,an intermediate scale when the field fluctuations probe the broken symmetry states and an asymptotic scale wherein a scaling regime emerges for modes of wavelength comparable to or larger than the horizon.The scaling regime is characterized by a dynamical physical correlation length xi_{phys} = d_H(t) with d_H(t) the size of the causal horizon, thus there is one correlated region per causal horizon. Inside these correlated regions the field fluctuations sample the broken symmetry states. The amplitude of the long-wavelength fluctuations becomes non-perturbatively large due to the early times instabilities and a semiclassical but stochastic description emerges in the asymptotic regime. In the scaling regime, the power spectrum is peaked at zero momentum revealing the onset of a Bose-Einstein condensate.The scaling solution results in that the equation of state of the scalar fields is the same as that of the background fluid. This implies a Harrison-Zeldovich spectrum of scalar density perturbations for long-wavelengths. We discuss the corrections to scaling as well as the universality of the scaling solution and the differences and similarities with the classical non-linear sigma model. |
0801.0389 | Peter Orland | Peter Orland (Niels Bohr Int. Academy, Grad. Center, CUNY, Baruch
College, CUNY) | Near-integrability and confinement for high-energy hadron-hadron
collisions | Typographical errors corrected, language improved, reference added | Phys.Rev.D77:056004,2008 | 10.1103/PhysRevD.77.056004 | BCCUNY-HEP/08-01 | hep-ph hep-lat hep-th nucl-th | null | We investigate an effective Hamiltonian for QCD at large s, in which
longitudinal gauge degrees of freedom are suppressed, but not eliminated. In an
axial gauge the effective field theory is a set of coupled (1+1)-dimensional
principal-chiral models, which are completely integrable. The confinement
problem is solvable in this context, and we find the longitudinal and
transverse string tensions with techniques already used for a similar
Hamiltonian in (2+1)-dimensions. We find some a posteriori justification for
the effective Hamiltonian as an eikonal approximation. Hadrons in this
approximation consist of partons, which are quarks and soliton-like excitations
of the sigma models. Diffractive hadron-hadron scattering appears primarily due
to exchange of longitudinal flux between partons.
| [
{
"created": "Wed, 2 Jan 2008 16:59:46 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Jan 2008 12:58:09 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Orland",
"Peter",
"",
"Niels Bohr Int. Academy, Grad. Center, CUNY, Baruch\n College, CUNY"
]
] | We investigate an effective Hamiltonian for QCD at large s, in which longitudinal gauge degrees of freedom are suppressed, but not eliminated. In an axial gauge the effective field theory is a set of coupled (1+1)-dimensional principal-chiral models, which are completely integrable. The confinement problem is solvable in this context, and we find the longitudinal and transverse string tensions with techniques already used for a similar Hamiltonian in (2+1)-dimensions. We find some a posteriori justification for the effective Hamiltonian as an eikonal approximation. Hadrons in this approximation consist of partons, which are quarks and soliton-like excitations of the sigma models. Diffractive hadron-hadron scattering appears primarily due to exchange of longitudinal flux between partons. |
2307.07235 | Maciej Rybczynski | Valeria Zelina Reyna Ortiz, Maciej Rybczynski, Zbigniew Wlodarczyk | A Monte Carlo study of multiplicity fluctuations in proton-proton
collisions at $\sqrt{s}=$~7~TeV | null | Phys. Rev. D 108 (2023) 074009 | 10.1103/PhysRevD.108.074009 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | With large volumes of data available at LHC, it has possible to study the
multiplicity distributions. It is interesting as well to check how well event
generators can describes the properties and the behavior of multi-particle
production processes. In this paper, we analyse the oscillatory behavior of
modified combinants in proton-proton collisions at centre of mass energy of 7
TeV.
| [
{
"created": "Fri, 14 Jul 2023 09:17:45 GMT",
"version": "v1"
}
] | 2024-02-28 | [
[
"Ortiz",
"Valeria Zelina Reyna",
""
],
[
"Rybczynski",
"Maciej",
""
],
[
"Wlodarczyk",
"Zbigniew",
""
]
] | With large volumes of data available at LHC, it has possible to study the multiplicity distributions. It is interesting as well to check how well event generators can describes the properties and the behavior of multi-particle production processes. In this paper, we analyse the oscillatory behavior of modified combinants in proton-proton collisions at centre of mass energy of 7 TeV. |
hep-ph/9910386 | Yi Bing Ding | Yi-Bing Ding, Xue-Qian Li and Peng-Nian Shen | Application of Hypervirial Theorem As Criteria For Accuracy of
Variational Trial Wave Function | 21 pages, Revtex file | null | null | null | hep-ph | null | It would be interesting to investigate the accuracy of the results obtained
in the variational method, because it is important for studying hadron spectra.
One can define some criteria to judge the accuracy, or the quality of the trial
function. We employ a simple potential form to check how accurate the
variational results obtained by a single-parameter trial function can be. All
the concerned problems, in particular, the relevant aspects on the application
of hypervirial theorem in variational method for various potential forms, are
discussed in every detail. The qualitative conclusion of the work can be
generalized to much more complicated cases. Our study suggests that the
hypervirial relations can serve as a good and practical criterion for judging
the accuracy of any trial functions.
| [
{
"created": "Mon, 18 Oct 1999 14:37:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ding",
"Yi-Bing",
""
],
[
"Li",
"Xue-Qian",
""
],
[
"Shen",
"Peng-Nian",
""
]
] | It would be interesting to investigate the accuracy of the results obtained in the variational method, because it is important for studying hadron spectra. One can define some criteria to judge the accuracy, or the quality of the trial function. We employ a simple potential form to check how accurate the variational results obtained by a single-parameter trial function can be. All the concerned problems, in particular, the relevant aspects on the application of hypervirial theorem in variational method for various potential forms, are discussed in every detail. The qualitative conclusion of the work can be generalized to much more complicated cases. Our study suggests that the hypervirial relations can serve as a good and practical criterion for judging the accuracy of any trial functions. |
1512.08598 | Xiao-Ming Xu | Zhen-Yu Shen, Xiao-Ming Xu, H. J. Weber | Cross sections for inelastic meson-meson scattering via quark-antiquark
annihilation | 53 pages, 13 figures | Phys. Rev. D 94, 034030 (2016) | 10.1103/PhysRevD.94.034030 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study inelastic meson-meson scattering that is governed by quark-antiquark
annihilation and creation involving a quark and an antiquark annihilating into
a gluon, and subsequently the gluon creating another quark-antiquark pair. The
resultant hadronic reactions include for I=1: pion + pion to rho + rho, kaon +
antikaon to kaon* + antikaon*, kaon + antikaon* to kaon* + antikaon*, kaon* +
antikaon to kaon* + antikaon*, as well as pion + pion to kaon + antikaon, pion
+ rho to kaon + antikaon*, pion + rho to kaon* + antikaon, and kaon + antikaon
to rho + rho. In each reaction, one or two Feynman diagrams are involved in the
Born approximation. We derive formulas for the unpolarized cross section, the
transition amplitude, and the transition potential for quark-antiquark
annihilation and creation. The unpolarized cross sections for the reactions are
calculated at six temperatures, and prominent temperature dependence is found.
It is due to differences among mesonic temperature dependence in hadronic
matter.
| [
{
"created": "Tue, 29 Dec 2015 04:33:41 GMT",
"version": "v1"
}
] | 2016-08-24 | [
[
"Shen",
"Zhen-Yu",
""
],
[
"Xu",
"Xiao-Ming",
""
],
[
"Weber",
"H. J.",
""
]
] | We study inelastic meson-meson scattering that is governed by quark-antiquark annihilation and creation involving a quark and an antiquark annihilating into a gluon, and subsequently the gluon creating another quark-antiquark pair. The resultant hadronic reactions include for I=1: pion + pion to rho + rho, kaon + antikaon to kaon* + antikaon*, kaon + antikaon* to kaon* + antikaon*, kaon* + antikaon to kaon* + antikaon*, as well as pion + pion to kaon + antikaon, pion + rho to kaon + antikaon*, pion + rho to kaon* + antikaon, and kaon + antikaon to rho + rho. In each reaction, one or two Feynman diagrams are involved in the Born approximation. We derive formulas for the unpolarized cross section, the transition amplitude, and the transition potential for quark-antiquark annihilation and creation. The unpolarized cross sections for the reactions are calculated at six temperatures, and prominent temperature dependence is found. It is due to differences among mesonic temperature dependence in hadronic matter. |
0707.3899 | Daniel Arteaga | Daniel Arteaga | Particle propagation in non-trivial backgrounds: a quantum field theory
approach | 269 pages, 17 figures. PhD thesis, Universitat de Barcelona. One
reference added, minor typos corrected | null | null | null | hep-ph gr-qc hep-th | null | The basic aim of the thesis is the study of the propagation of particles and
quasiparticles in non-trivial backgrounds from the quantum field theory point
of view. By "non-trivial background" we mean either a non-vacuum state in
Minkowski spacetime or an arbitrary state in a curved spacetime. Starting with
the case of a flat spacetime, the basic properties of the particle and
quasiparticle propagation are analyzed using two different methods other than
the conventional mean-field-based techniques: on the one hand, the quantum
state corresponding to the quasiparticle excitation is explicitly constructed;
on the other hand, the spectral representation of the two-point propagators is
analyzed. Both methods lead to the same results: the energy and decay rate of
the quasiparticles are determined by the real and imaginary parts of the
retarded self-energy respectively. These general results are applied to two
particular quantum systems: first, a scalar particle immersed in a thermal
graviton bath; second, a simplified atomic model, seizing the opportunity to
connect with other statistical and first-quantized approaches. In the second
part of the thesis the results are extended to curved spacetime. Working with a
quasilocal quasiparticle concept the flat-spacetime results are recovered. In
cosmology, within the adiabatic approximation, it is possible to go beyond the
flat spacetime results and find additional effects due to the universe
expansion. The cosmologically-induced effects are analyzed, obtaining that
there might be an additional contribution to the particle decay due to the
universe expansion. In the de Sitter case, this additional contribution
coincides with the decay rate in a thermal bath in a flat spacetime at the
corresponding de Sitter temperature.
| [
{
"created": "Thu, 26 Jul 2007 11:07:00 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Sep 2007 14:07:07 GMT",
"version": "v2"
}
] | 2016-09-08 | [
[
"Arteaga",
"Daniel",
""
]
] | The basic aim of the thesis is the study of the propagation of particles and quasiparticles in non-trivial backgrounds from the quantum field theory point of view. By "non-trivial background" we mean either a non-vacuum state in Minkowski spacetime or an arbitrary state in a curved spacetime. Starting with the case of a flat spacetime, the basic properties of the particle and quasiparticle propagation are analyzed using two different methods other than the conventional mean-field-based techniques: on the one hand, the quantum state corresponding to the quasiparticle excitation is explicitly constructed; on the other hand, the spectral representation of the two-point propagators is analyzed. Both methods lead to the same results: the energy and decay rate of the quasiparticles are determined by the real and imaginary parts of the retarded self-energy respectively. These general results are applied to two particular quantum systems: first, a scalar particle immersed in a thermal graviton bath; second, a simplified atomic model, seizing the opportunity to connect with other statistical and first-quantized approaches. In the second part of the thesis the results are extended to curved spacetime. Working with a quasilocal quasiparticle concept the flat-spacetime results are recovered. In cosmology, within the adiabatic approximation, it is possible to go beyond the flat spacetime results and find additional effects due to the universe expansion. The cosmologically-induced effects are analyzed, obtaining that there might be an additional contribution to the particle decay due to the universe expansion. In the de Sitter case, this additional contribution coincides with the decay rate in a thermal bath in a flat spacetime at the corresponding de Sitter temperature. |
hep-ph/0401103 | Santo Fortunato Dr | Philippe Blanchard, Santo Fortunato, Helmut Satz | The Hagedorn Temperature and Partition Thermodynamics | Dedicated to Rolf Hagedorn, 1919-2003. 11 pages, 3 figures. Final
version accepted for publication in the European Physical Journal C | Eur.Phys.J. C34 (2004) 361-366 | 10.1140/epjc/s2004-01673-0 | BI-TP 2004/01 | hep-ph hep-th | null | We review the resonance gas formalism of hadron thermodynamics and recall
that an exponential increase of the resonance spectrum leads to a limiting
temperature of hadronic matter. We then show that the number p(n) of ordered
partitions of an integer n grows exponentially with n and satisfies the integer
counterpart of the statistical bootstrap equation. Considering the set of all
partitions as a Gibbs ensemble provides a partition thermodynamics which is
also governed by a limiting temperature, determined by the combinatorial
structure of the problem. Further associating intrinsic quantum numbers to
integers results in a phase diagram equivalent to that found in QCD for
hadronic matter as function of temperature and baryochemical potential.
| [
{
"created": "Wed, 14 Jan 2004 15:43:11 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Jan 2004 16:31:44 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Blanchard",
"Philippe",
""
],
[
"Fortunato",
"Santo",
""
],
[
"Satz",
"Helmut",
""
]
] | We review the resonance gas formalism of hadron thermodynamics and recall that an exponential increase of the resonance spectrum leads to a limiting temperature of hadronic matter. We then show that the number p(n) of ordered partitions of an integer n grows exponentially with n and satisfies the integer counterpart of the statistical bootstrap equation. Considering the set of all partitions as a Gibbs ensemble provides a partition thermodynamics which is also governed by a limiting temperature, determined by the combinatorial structure of the problem. Further associating intrinsic quantum numbers to integers results in a phase diagram equivalent to that found in QCD for hadronic matter as function of temperature and baryochemical potential. |
hep-ph/9910334 | Esteban Calzetta | E. Calzetta, B. L. Hu and S. Ramsey | Hydrodynamic transport functions from quantum kinetic theory | 25 pages revtex, 11 postscript figures. Final version accepted for
publication | Phys.Rev. D61 (2000) 125013 | 10.1103/PhysRevD.61.125013 | null | hep-ph | null | Starting from the quantum kinetic field theory [E. Calzetta and B. L. Hu,
Phys. Rev. D37, 2878 (1988)] constructed from the closed-time-path (CTP),
two-particle-irreducible (2PI) effective action we show how to compute from
first principles the shear and bulk viscosity functions in the
hydrodynamic-thermodynamic regime. For a real scalar field with $\lambda \Phi
^{4}$ self-interaction we need to include 4 loop graphs in the equation of
motion. This work provides a microscopic field-theoretical basis to the
``effective kinetic theory'' proposed by Jeon and Yaffe [S. Jeon and L. G.
Yaffe, Phys. Rev. D53, 5799 (1996)], while our result for the bulk viscosity
reproduces their expression derived from linear response theory and the
imaginary-time formalism of thermal field theory. Though unavoidably involved
in calculations of this sort, we feel that the approach using fundamental
quantum kinetic field theory is conceptually clearer and methodically simpler
than the effective kinetic theory approach, as the success of the latter
requires clever rendition of diagrammatic resummations which is neither
straightforward nor failsafe. Moreover, the method based on the CTP-2PI
effective action illustrated here for a scalar field can be formulated entirely
in terms of functional integral quantization, which makes it an appealing
method for a first-principles calculation of transport functions of a thermal
non-abelian gauge theory, e.g., QCD quark-gluon plasma produced from heavy ion
collisions.
| [
{
"created": "Wed, 13 Oct 1999 21:08:53 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Mar 2000 18:30:27 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Calzetta",
"E.",
""
],
[
"Hu",
"B. L.",
""
],
[
"Ramsey",
"S.",
""
]
] | Starting from the quantum kinetic field theory [E. Calzetta and B. L. Hu, Phys. Rev. D37, 2878 (1988)] constructed from the closed-time-path (CTP), two-particle-irreducible (2PI) effective action we show how to compute from first principles the shear and bulk viscosity functions in the hydrodynamic-thermodynamic regime. For a real scalar field with $\lambda \Phi ^{4}$ self-interaction we need to include 4 loop graphs in the equation of motion. This work provides a microscopic field-theoretical basis to the ``effective kinetic theory'' proposed by Jeon and Yaffe [S. Jeon and L. G. Yaffe, Phys. Rev. D53, 5799 (1996)], while our result for the bulk viscosity reproduces their expression derived from linear response theory and the imaginary-time formalism of thermal field theory. Though unavoidably involved in calculations of this sort, we feel that the approach using fundamental quantum kinetic field theory is conceptually clearer and methodically simpler than the effective kinetic theory approach, as the success of the latter requires clever rendition of diagrammatic resummations which is neither straightforward nor failsafe. Moreover, the method based on the CTP-2PI effective action illustrated here for a scalar field can be formulated entirely in terms of functional integral quantization, which makes it an appealing method for a first-principles calculation of transport functions of a thermal non-abelian gauge theory, e.g., QCD quark-gluon plasma produced from heavy ion collisions. |
1305.0767 | Robert D. Pisarski | Kouji Kashiwa, Robert D. Pisarski, and Vladimir V. Skokov | Quasi-particle and matrix models of the semi Quark Gluon Plasma | 5 pages, 3 figures. To appear in the proceedings of Quark Matter
2012, Washington DC, Aug. 13-18, 2012 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We make a simple observation about two models used to treat the region near
the critical temperature of QCD, quasiparticle and matrix models. While they
appear very different, we show how these two models might be related. We also
present results for the temperature dependence of the ratio of the shear
viscosity to the entropy in a matrix model, and suggest that quasi-particle
models may behave similarly.
| [
{
"created": "Fri, 3 May 2013 16:31:42 GMT",
"version": "v1"
}
] | 2013-05-06 | [
[
"Kashiwa",
"Kouji",
""
],
[
"Pisarski",
"Robert D.",
""
],
[
"Skokov",
"Vladimir V.",
""
]
] | We make a simple observation about two models used to treat the region near the critical temperature of QCD, quasiparticle and matrix models. While they appear very different, we show how these two models might be related. We also present results for the temperature dependence of the ratio of the shear viscosity to the entropy in a matrix model, and suggest that quasi-particle models may behave similarly. |
1506.03023 | Valery Lyubovitskij | Yurii S. Surovtsev, Petr Bydzovsky, Thomas Gutsche, Robert Kaminski,
Valery E. Lyubovitskij, Miroslav Nagy | Unified description of BaBar and Belle data on the bottomonia decays
Upsilon(mS) -> Upsilon(nS) pi+ pi- | 8 pages | Phys. Rev. D 92, 036002 (2015) | 10.1103/PhysRevD.92.036002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a unified analysis of the decays of bottomonia Upsilon(mS) ->
Upsilon(nS) pi pi (m>n, m=2,3,4,5, n=1,2,3), charmonia J/psi -> phi (pi pi, K
antiK), psi(2S) -> J/psi pi pi and the isoscalar S-wave processes pi pi -> pi
pi, K antiK, eta eta. In this analysis we extend our recent study of low-lying
(m=2,3) radial excitations of bottomonia to modes involving higher (m=4,5)
excited states. Similarly as for the data on lower radial excitations, we
confirm that the data for higher radially excited states from the BaBar and
Belle collaborations can be described under conditions that the final
bottomonium is a spectator and the multichannel pi pi scattering is considered
in a model-independent approach based on analyticity, unitarity and the
uniformization procedure. Indeed we show that the dipion mass distributions in
the two-pion transitions of both charmonia and bottomonia states are explained
by a unified mechanism based on the contribution of the pi pi and K antiK
coupled channels including their interference (final-state interactions).
Therefore, our main result is that the lower and higher radially excited states
of charmonia and bottomonia have no specific features in mutual comparison and
can be understood in a unified picture, e.g. proposed by our approach.
| [
{
"created": "Tue, 9 Jun 2015 18:01:59 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Aug 2015 14:20:46 GMT",
"version": "v2"
}
] | 2015-08-05 | [
[
"Surovtsev",
"Yurii S.",
""
],
[
"Bydzovsky",
"Petr",
""
],
[
"Gutsche",
"Thomas",
""
],
[
"Kaminski",
"Robert",
""
],
[
"Lyubovitskij",
"Valery E.",
""
],
[
"Nagy",
"Miroslav",
""
]
] | We present a unified analysis of the decays of bottomonia Upsilon(mS) -> Upsilon(nS) pi pi (m>n, m=2,3,4,5, n=1,2,3), charmonia J/psi -> phi (pi pi, K antiK), psi(2S) -> J/psi pi pi and the isoscalar S-wave processes pi pi -> pi pi, K antiK, eta eta. In this analysis we extend our recent study of low-lying (m=2,3) radial excitations of bottomonia to modes involving higher (m=4,5) excited states. Similarly as for the data on lower radial excitations, we confirm that the data for higher radially excited states from the BaBar and Belle collaborations can be described under conditions that the final bottomonium is a spectator and the multichannel pi pi scattering is considered in a model-independent approach based on analyticity, unitarity and the uniformization procedure. Indeed we show that the dipion mass distributions in the two-pion transitions of both charmonia and bottomonia states are explained by a unified mechanism based on the contribution of the pi pi and K antiK coupled channels including their interference (final-state interactions). Therefore, our main result is that the lower and higher radially excited states of charmonia and bottomonia have no specific features in mutual comparison and can be understood in a unified picture, e.g. proposed by our approach. |
0907.5044 | George W. S. Hou | George Wei-Shu Hou | Lecture about the Recent Nobel Prize -- From B Factory to the Large
Hadron Collider -- | 12 pages, no figures, invited lecture presented at FPCP 2009, to
appear in PoS proceedings; 1 footnote and reference added | PoS FPCP2009:047,2009 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | These are the transcriptions of "a talk describing the theoretical insights
of those honored (and the one who wasn't) and how this has led to all the
physics we have been doing over the last couple of decades." After prologue, we
first deal with Nambu's insight on Spontaneous Symmetry Breaking, which is
rooted in an analogy with the BCS theory of superconductivity. The insight
resonates to this day, as we await the LHC era to dawn. The second half starts
from Gell-Mann--L\'evy--Cabibbo theory, through the GIM mechanism that
completed the $2\times 2$ rotations, to the insight of Kobayashi and Maskawa
that CP violation could arise from the charged currents, if there exists a 3rd
generation of quarks. The richness that followed defines this (FPCP)
conference. We end with a perspective on a (possible) redux with a 4th
generation of quarks.
| [
{
"created": "Wed, 29 Jul 2009 04:04:54 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Aug 2009 17:06:49 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Hou",
"George Wei-Shu",
""
]
] | These are the transcriptions of "a talk describing the theoretical insights of those honored (and the one who wasn't) and how this has led to all the physics we have been doing over the last couple of decades." After prologue, we first deal with Nambu's insight on Spontaneous Symmetry Breaking, which is rooted in an analogy with the BCS theory of superconductivity. The insight resonates to this day, as we await the LHC era to dawn. The second half starts from Gell-Mann--L\'evy--Cabibbo theory, through the GIM mechanism that completed the $2\times 2$ rotations, to the insight of Kobayashi and Maskawa that CP violation could arise from the charged currents, if there exists a 3rd generation of quarks. The richness that followed defines this (FPCP) conference. We end with a perspective on a (possible) redux with a 4th generation of quarks. |
1307.2936 | Jakub Wagner | H. Moutarde, B. Pire, F. Sabati\'e, L. Szymanowski, J. Wagner | On the importance of gluon contributions to timelike and spacelike DVCS | Presented on 21th International Workshop on Deep-Inelastic Scattering
and Related Subjects (DIS 2013) | null | null | IRFU-13-106, CPHT-PC055.0613 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We emphasize how large O(\alpha_s) corrections to timelike and spacelike
virtual Compton scattering amplitudes are in the generalized Bjorken scaling
regime, and in particular the gluonic contributions, even in the medium energy
range which will be studied intensely at JLab12 and in the COMPASS-II
experiment at CERN. We stress that the timelike and spacelike cases are
complementary and that their difference deserves much special attention.
| [
{
"created": "Wed, 10 Jul 2013 22:44:27 GMT",
"version": "v1"
}
] | 2013-07-19 | [
[
"Moutarde",
"H.",
""
],
[
"Pire",
"B.",
""
],
[
"Sabatié",
"F.",
""
],
[
"Szymanowski",
"L.",
""
],
[
"Wagner",
"J.",
""
]
] | We emphasize how large O(\alpha_s) corrections to timelike and spacelike virtual Compton scattering amplitudes are in the generalized Bjorken scaling regime, and in particular the gluonic contributions, even in the medium energy range which will be studied intensely at JLab12 and in the COMPASS-II experiment at CERN. We stress that the timelike and spacelike cases are complementary and that their difference deserves much special attention. |
0805.3423 | Nicole F. Bell | Nicole F. Bell, James B. Dent, Thomas D. Jacques, and Thomas J. Weiler | Electroweak Bremsstrahlung in Dark Matter Annihilation | 7 pages, 4 figures. New appendix with an extensive discussion of
Majorana fermions and helicity suppressions | Phys.Rev.D78:083540,2008 | 10.1103/PhysRevD.78.083540 | null | hep-ph astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A conservative upper bound on the total dark matter (DM) annihilation rate
can be obtained by constraining the appearance rate of the annihilation
products which are hardest to detect. The production of neutrinos, via the
process $\chi \chi \to \bar\nu \nu $, has thus been used to set a strong
general bound on the dark matter annihilation rate. However, Standard Model
radiative corrections to this process will inevitably produce photons which may
be easier to detect. We present an explicit calculation of the branching ratios
for the electroweak bremsstrahlung processes $\chi \chi \to \bar\nu \nu Z$ and
$\chi \chi \to \bar\nu e W$. These modes inevitably lead to electromagnetic
showers and further constraints on the DM annihilation cross-section. In
addition to annihilation, our calculations are also applicable to the case of
dark matter decay.
| [
{
"created": "Thu, 22 May 2008 10:18:40 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Dec 2008 04:39:29 GMT",
"version": "v2"
}
] | 2008-12-22 | [
[
"Bell",
"Nicole F.",
""
],
[
"Dent",
"James B.",
""
],
[
"Jacques",
"Thomas D.",
""
],
[
"Weiler",
"Thomas J.",
""
]
] | A conservative upper bound on the total dark matter (DM) annihilation rate can be obtained by constraining the appearance rate of the annihilation products which are hardest to detect. The production of neutrinos, via the process $\chi \chi \to \bar\nu \nu $, has thus been used to set a strong general bound on the dark matter annihilation rate. However, Standard Model radiative corrections to this process will inevitably produce photons which may be easier to detect. We present an explicit calculation of the branching ratios for the electroweak bremsstrahlung processes $\chi \chi \to \bar\nu \nu Z$ and $\chi \chi \to \bar\nu e W$. These modes inevitably lead to electromagnetic showers and further constraints on the DM annihilation cross-section. In addition to annihilation, our calculations are also applicable to the case of dark matter decay. |
hep-ph/9811352 | Marcello Lissia | V.Berezinsky, G.Fiorentini, and M.Lissia | Vacuum oscillations and the distorted solar neutrino spectrum observed
by Superkamiokande | 6 pages, ReVTeX, 3 postscript figures; one figure and relative text
added | null | null | INFNCA-TH9815 | hep-ph astro-ph | null | The excess of solar-neutrino events above 13 MeV that has been recently
observed by Superkamiokande can be explained by vacuum oscillations (VO). If
the boron neutrino flux is 20% smaller than the standard solar model (SSM)
prediction and the chlorine signal is assumed 30% (or 3.5 sigmas) higher than
the measured one, there exists a VO solution that reproduces both the observed
boron neutrino spectrum, including the high energy distortion, and the other
measured neutrino rates. This solution might already be testable by the
predicted anomalous seasonal variation of the gallium signal. Its most distinct
signature, a large anomalous seasonal variation of Be7 neutrino flux, can be
easily observed by the future detectors, BOREXINO and LENS.
| [
{
"created": "Mon, 16 Nov 1998 20:06:42 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Nov 1998 11:06:58 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Berezinsky",
"V.",
""
],
[
"Fiorentini",
"G.",
""
],
[
"Lissia",
"M.",
""
]
] | The excess of solar-neutrino events above 13 MeV that has been recently observed by Superkamiokande can be explained by vacuum oscillations (VO). If the boron neutrino flux is 20% smaller than the standard solar model (SSM) prediction and the chlorine signal is assumed 30% (or 3.5 sigmas) higher than the measured one, there exists a VO solution that reproduces both the observed boron neutrino spectrum, including the high energy distortion, and the other measured neutrino rates. This solution might already be testable by the predicted anomalous seasonal variation of the gallium signal. Its most distinct signature, a large anomalous seasonal variation of Be7 neutrino flux, can be easily observed by the future detectors, BOREXINO and LENS. |
hep-ph/0401213 | Tatsuru Kikuchi | Takeshi Fukuyama, Amon Ilakovac, Tatsuru Kikuchi, Stjepan Meljanac and
Nobuchika Okada | General Formulation for Proton Decay Rate in Minimal Supersymmetric
SO(10) GUT | 32 pages, typos are corrected, a few references and comments to the
papers arXiv:hep-ph/0204097 and arXiv:hep-ph/0402122 are added | Eur.Phys.J.C42:191-203,2005 | 10.1140/epjc/s2005-02283-0 | KEK-TH-937 | hep-ph | null | We make an explicit formulation for the proton decay rate in the minimal
renormalizable supersymmetric (SUSY) SO(10) model. In this model, the Higgs
fields consist of ${\bf 10}$ and ${\bf \bar{126}}$ SO(10) representations in
the Yukawa interactions with matter and of ${\bf 10}$, ${\bf \bar{126}}$, ${\bf
126}$, and ${\bf 210}$ representations in the Higgs potential. We present all
the mass matrices for the Higgs fields contained in this minimal SUSY SO(10)
model. Finally, we discuss the threshold effects of these Higgs fields on the
gauge coupling unification.
| [
{
"created": "Tue, 27 Jan 2004 04:53:16 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Mar 2004 06:12:23 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Fukuyama",
"Takeshi",
""
],
[
"Ilakovac",
"Amon",
""
],
[
"Kikuchi",
"Tatsuru",
""
],
[
"Meljanac",
"Stjepan",
""
],
[
"Okada",
"Nobuchika",
""
]
] | We make an explicit formulation for the proton decay rate in the minimal renormalizable supersymmetric (SUSY) SO(10) model. In this model, the Higgs fields consist of ${\bf 10}$ and ${\bf \bar{126}}$ SO(10) representations in the Yukawa interactions with matter and of ${\bf 10}$, ${\bf \bar{126}}$, ${\bf 126}$, and ${\bf 210}$ representations in the Higgs potential. We present all the mass matrices for the Higgs fields contained in this minimal SUSY SO(10) model. Finally, we discuss the threshold effects of these Higgs fields on the gauge coupling unification. |
0704.1232 | Christoph Berger | Ch. Berger, L. Sehgal | CP Violation and Arrows of Time Evolution of a Neutral $K$ or $B$ Meson
from an Incoherent to a Coherent State | 13 pages, 6 figures. Inserted conon "." in title; minor change in
text. To appear in Physical review D | Phys.Rev.D76:036003,2007 | 10.1103/PhysRevD.76.036003 | null | hep-ph | null | We study the evolution of a neutral $K$ meson prepared as an incoherent equal
mixture of $K^0$ and $\bar{K^0}$. Denoting the density matrix by $\rho(t) =
{1/2} N(t) [\1 + \vec{\zeta}(t) \cdot \vec{\sigma} ] $, the norm of the state
$N(t)$ is found to decrease monotonically from one to zero, while the magnitude
of the Stokes vector $|\vec{\zeta}(t)|$ increases monotonically from zero to
one. This property qualifies these observables as arrows of time. Requiring
monotonic behaviour of $N(t)$ for arbitrary values of $\gamma_L, \gamma_S$ and
$\Delta m$ yields a bound on the CP-violating overlap $\delta =
\braket{K_L}{K_S}$, which is similar to, but weaker than, the known unitarity
bound. A similar requirement on $|\vec{\zeta}(t)|$ yields a new bound,
$\delta^2 < {1/2} (\frac{\Delta \gamma}{\Delta m}) \sinh (\frac{3\pi}{4}
\frac{\Delta \gamma}{\Delta m})$ which is particularly effective in limiting
the CP-violating overlap in the $B^0$-$\bar{B^0}$ system. We obtain the Stokes
parameter $\zeta_3(t)$ which shows how the average strangeness of the beam
evolves from zero to $\delta$. The evolution of the Stokes vector from
$|\vec{\zeta}| = 0$ to $|\vec{\zeta}| = 1$ has a resemblance to an order
parameter of a system undergoing spontaneous symmetry breaking.
| [
{
"created": "Tue, 10 Apr 2007 13:19:57 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Jul 2007 14:19:21 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Berger",
"Ch.",
""
],
[
"Sehgal",
"L.",
""
]
] | We study the evolution of a neutral $K$ meson prepared as an incoherent equal mixture of $K^0$ and $\bar{K^0}$. Denoting the density matrix by $\rho(t) = {1/2} N(t) [\1 + \vec{\zeta}(t) \cdot \vec{\sigma} ] $, the norm of the state $N(t)$ is found to decrease monotonically from one to zero, while the magnitude of the Stokes vector $|\vec{\zeta}(t)|$ increases monotonically from zero to one. This property qualifies these observables as arrows of time. Requiring monotonic behaviour of $N(t)$ for arbitrary values of $\gamma_L, \gamma_S$ and $\Delta m$ yields a bound on the CP-violating overlap $\delta = \braket{K_L}{K_S}$, which is similar to, but weaker than, the known unitarity bound. A similar requirement on $|\vec{\zeta}(t)|$ yields a new bound, $\delta^2 < {1/2} (\frac{\Delta \gamma}{\Delta m}) \sinh (\frac{3\pi}{4} \frac{\Delta \gamma}{\Delta m})$ which is particularly effective in limiting the CP-violating overlap in the $B^0$-$\bar{B^0}$ system. We obtain the Stokes parameter $\zeta_3(t)$ which shows how the average strangeness of the beam evolves from zero to $\delta$. The evolution of the Stokes vector from $|\vec{\zeta}| = 0$ to $|\vec{\zeta}| = 1$ has a resemblance to an order parameter of a system undergoing spontaneous symmetry breaking. |
hep-ph/9604208 | Gursevil Turan | Patrick J. O'Donnell and Gursevil Turan | Charm and Bottom Semileptonic Decays | Latex, 19 pages, two figures are attached, a minor change in the
manuscript related to this | Phys.Rev.D56:295-302,1997 | 10.1103/PhysRevD.56.295 | UTPT--96--06 | hep-ph | null | We review the present status of theoretical attempts to calculate the
semileptonic charm and bottom decays and then present a calculation of these
decays in the light--front frame at the kinematic point $q^2=0$. This allows us
to evaluate the form factors at the same value of $q^2$, even though the
allowed kinematic ranges for charm and bottom decays are very different. Also,
at this kinematic point the decay is given in terms of only one form factor
$A_{0}(0)$. For the ratio of the decay rates given by the E653 collaboration we
show that the determination of the ratio of the Cabibbo--Kobayashi--Maskawa
(CKM) matrix elements is consistent with that obtained from the unitarity
constraint. At present, though, the unitarity method still has greater
accuracy. Since comparisons of the semileptonic decays into $\rho$ and either
electrons or muons will be available soon from the E791 Fermilab experiment, we
also look at the massive muon case. We show that for a range of $q^2$ the
$SU(3)_F$ symmetry breaking is small even though the contributions of the
various helicity amplitudes becomes more complicated. For $B$ decays, the decay
$B \rightarrow K^{*} \ell \bar{\ell}$ at $q^2=0$ involves an extra form factor
coming from the photon contribution and so is not amenable to the same kind of
analysis, leaving only the decay $B \rightarrow K^{*}\nu \bar{\nu}$ as a
possibility. As the mass of the decaying particle increases we note that the
$SU(3)$ symmetry becomes badly broken at $q^2=0$.
| [
{
"created": "Mon, 1 Apr 1996 19:34:15 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Jun 1996 16:58:04 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Jun 1996 13:59:30 GMT",
"version": "v3"
}
] | 2010-11-23 | [
[
"O'Donnell",
"Patrick J.",
""
],
[
"Turan",
"Gursevil",
""
]
] | We review the present status of theoretical attempts to calculate the semileptonic charm and bottom decays and then present a calculation of these decays in the light--front frame at the kinematic point $q^2=0$. This allows us to evaluate the form factors at the same value of $q^2$, even though the allowed kinematic ranges for charm and bottom decays are very different. Also, at this kinematic point the decay is given in terms of only one form factor $A_{0}(0)$. For the ratio of the decay rates given by the E653 collaboration we show that the determination of the ratio of the Cabibbo--Kobayashi--Maskawa (CKM) matrix elements is consistent with that obtained from the unitarity constraint. At present, though, the unitarity method still has greater accuracy. Since comparisons of the semileptonic decays into $\rho$ and either electrons or muons will be available soon from the E791 Fermilab experiment, we also look at the massive muon case. We show that for a range of $q^2$ the $SU(3)_F$ symmetry breaking is small even though the contributions of the various helicity amplitudes becomes more complicated. For $B$ decays, the decay $B \rightarrow K^{*} \ell \bar{\ell}$ at $q^2=0$ involves an extra form factor coming from the photon contribution and so is not amenable to the same kind of analysis, leaving only the decay $B \rightarrow K^{*}\nu \bar{\nu}$ as a possibility. As the mass of the decaying particle increases we note that the $SU(3)$ symmetry becomes badly broken at $q^2=0$. |
2404.07657 | Krzysztof Marek Kutak | Pawel Caputa, Krzysztof Kutak | Krylov complexity and gluon cascades in the high energy limit | 9 pages | null | null | YITP-24-49, IFJPAN-IV-2024-6 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We point out an interesting connection between the mathematical framework of
the Krylov basis, which is used to quantify quantum complexity, and the
entanglement entropy in high-energy QCD. In particular, we observe that the
cascade equation of the dipole model is equivalent to the $SL(2,R)$ Schrodinger
equation in the Krylov basis. Consequently, the Krylov complexity corresponds
to the average distribution of partons and the Krylov entropy is the
counterpart the entanglement entropy computations of \cite{Kharzeev:2017qzs}.
Our work not only brings new tools for exploring quantum information and
complexity in QCD, but also gives hope for experimental tests of some of the
recent, physical probes of quantum complexity.
| [
{
"created": "Thu, 11 Apr 2024 11:43:39 GMT",
"version": "v1"
},
{
"created": "Sun, 5 May 2024 10:14:06 GMT",
"version": "v2"
}
] | 2024-05-07 | [
[
"Caputa",
"Pawel",
""
],
[
"Kutak",
"Krzysztof",
""
]
] | We point out an interesting connection between the mathematical framework of the Krylov basis, which is used to quantify quantum complexity, and the entanglement entropy in high-energy QCD. In particular, we observe that the cascade equation of the dipole model is equivalent to the $SL(2,R)$ Schrodinger equation in the Krylov basis. Consequently, the Krylov complexity corresponds to the average distribution of partons and the Krylov entropy is the counterpart the entanglement entropy computations of \cite{Kharzeev:2017qzs}. Our work not only brings new tools for exploring quantum information and complexity in QCD, but also gives hope for experimental tests of some of the recent, physical probes of quantum complexity. |
1305.1712 | Mikhail Braun | M.A. Braun | Inclusive cross-sections for gluon production in collision of two
projectiles on two targets in the BFKL approach | null | null | 10.1140/epjc/s10052-013-2511-x | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inclusive cross-sections for gluon production in collision of two mucleons
with two nucleons are studied in the BFKL approach. Various contributions
include emission from the pomerons attached to the participants, from the BFKL
interactions in between these pomerons and from the intermediate BKP state. The
last contribution may be observable provided the growth with energy of the
pomeron contribution is tamed in accordance with unitarity.
| [
{
"created": "Wed, 8 May 2013 04:13:14 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Braun",
"M. A.",
""
]
] | Inclusive cross-sections for gluon production in collision of two mucleons with two nucleons are studied in the BFKL approach. Various contributions include emission from the pomerons attached to the participants, from the BFKL interactions in between these pomerons and from the intermediate BKP state. The last contribution may be observable provided the growth with energy of the pomeron contribution is tamed in accordance with unitarity. |
1009.3853 | Takayuki Matsuki | Takayuki Matsuki and Koichi Seo | Decay properties of the heavy-light mesons | an invited talk at "New Frontiers in QCD 2010" held at Kyoto | Prog. Theor. Phys. Suppl.186:148-154, 2010 | 10.1143/PTPS.186.148 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the decay properties of a heavy-light meson. We reformulate the
decay amplitudes for the heavy-light systems and find a new way to calculate
decay rates. Applying this formulation, we find a new sum rule for the
radiative decays of one heavy-light meson into another, $H_1\to H_2+\gamma$
with various combinations of $H_i$.
| [
{
"created": "Mon, 20 Sep 2010 15:34:59 GMT",
"version": "v1"
}
] | 2011-02-22 | [
[
"Matsuki",
"Takayuki",
""
],
[
"Seo",
"Koichi",
""
]
] | We study the decay properties of a heavy-light meson. We reformulate the decay amplitudes for the heavy-light systems and find a new way to calculate decay rates. Applying this formulation, we find a new sum rule for the radiative decays of one heavy-light meson into another, $H_1\to H_2+\gamma$ with various combinations of $H_i$. |
1512.02252 | Mariaelena Boglione | M. Anselmino, M. Boglione, U. D'Alesio, J.O. Gonzalez Hernandez, S.
Melis, F. Murgia, A. Prokudin | Extracting the Kaon Collins function from $e^+e^-$ hadron pair
production data | 11 pages, 6 figures | Phys. Rev. D 93, 034025 (2016) | 10.1103/PhysRevD.93.034025 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The latest data released by the BaBar Collaboration on azimuthal correlations
measured for pion-kaon and kaon-kaon pairs produced in $e^+e^-$ annihilations
allow, for the first time, a direct extraction of the kaon Collins functions.
These functions are then used to compute the kaon Collins asymmetries in Semi
Inclusive Deep Inelastic Scattering processes, which result in good agreement
with the measurements performed by the HERMES and COMPASS Collaborations.
| [
{
"created": "Mon, 7 Dec 2015 21:35:04 GMT",
"version": "v1"
}
] | 2016-02-24 | [
[
"Anselmino",
"M.",
""
],
[
"Boglione",
"M.",
""
],
[
"D'Alesio",
"U.",
""
],
[
"Hernandez",
"J. O. Gonzalez",
""
],
[
"Melis",
"S.",
""
],
[
"Murgia",
"F.",
""
],
[
"Prokudin",
"A.",
""
]
] | The latest data released by the BaBar Collaboration on azimuthal correlations measured for pion-kaon and kaon-kaon pairs produced in $e^+e^-$ annihilations allow, for the first time, a direct extraction of the kaon Collins functions. These functions are then used to compute the kaon Collins asymmetries in Semi Inclusive Deep Inelastic Scattering processes, which result in good agreement with the measurements performed by the HERMES and COMPASS Collaborations. |
hep-ph/0212203 | Geoffrey Bodwin | Geoffrey T. Bodwin (Argonne) | Recent Results on Quarkonium Production and Decay | 10 pages, uses modified ws-procs9x6.cls (ws-procs9x6-notrim.cls),
Plenary talk presented at The 5th International Conference Quark Confinement
and the Hadron Spectrum, Gargnano, Italy 10--14 September, 2002 | null | 10.1142/9789812704269_0006 | ANL-HEP-CP-02-114 | hep-ph | null | I summarize the current status of the comparison between experiment and the
predictions of the NRQCD factorization approach to quarkonium decay and
production. I also present the results of some recent calculations and
theoretical developments in the NRQCD factorization approach.
| [
{
"created": "Sat, 14 Dec 2002 18:52:47 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Bodwin",
"Geoffrey T.",
"",
"Argonne"
]
] | I summarize the current status of the comparison between experiment and the predictions of the NRQCD factorization approach to quarkonium decay and production. I also present the results of some recent calculations and theoretical developments in the NRQCD factorization approach. |
2004.06735 | Newton Nath | Francisco J. de Anda, Newton Nath, Jos\'e W. F. Valle, Carlos A.
Vaquera-Araujo | Probing the predictions of an orbifold theory of flavor | 11 pages, 4 figures, 3 tables. V2 matches with the PRD version | Phys. Rev. D 101, 116012 (2020) | 10.1103/PhysRevD.101.116012 | IFIC/20-XXX | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the implications of a recently proposed theory of fermion masses
and mixings in which an $A_4$ family symmetry emerges from orbifold
compactification. We analyse two variant schemes concerning their predictions
for neutrino oscillations, neutrinoless double-beta decay and the golden
quark-lepton unification mass relation. We find that upcoming experiments DUNE
as well as LEGEND and nEXO offer good chances of exploring a substantial region
of neutrino parameters.
| [
{
"created": "Tue, 14 Apr 2020 18:00:06 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Jun 2020 18:00:13 GMT",
"version": "v2"
}
] | 2020-07-01 | [
[
"de Anda",
"Francisco J.",
""
],
[
"Nath",
"Newton",
""
],
[
"Valle",
"José W. F.",
""
],
[
"Vaquera-Araujo",
"Carlos A.",
""
]
] | We examine the implications of a recently proposed theory of fermion masses and mixings in which an $A_4$ family symmetry emerges from orbifold compactification. We analyse two variant schemes concerning their predictions for neutrino oscillations, neutrinoless double-beta decay and the golden quark-lepton unification mass relation. We find that upcoming experiments DUNE as well as LEGEND and nEXO offer good chances of exploring a substantial region of neutrino parameters. |
1001.1851 | Neelesh Sharma | Neelesh Sharma | Branching ratios of Bc Meson Decays into Tensor Meson in the Final State | 18 pages. accepted in Physical Review D | Phys.Rev.D81:014027,2010 | 10.1103/PhysRevD.81.014027 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two-body hadronic weak decays of Bc meson involving tensor meson in the final
state are studied by using Isgur- Scora-Grinstein-Wise (ISGW II) model. Decay
amplitudes are obtained using the factorization scheme in the Spectator Quark
Model. Branching ratios for the charm changing and bottom changing decay modes
are predicted.
| [
{
"created": "Tue, 12 Jan 2010 11:08:19 GMT",
"version": "v1"
}
] | 2010-05-28 | [
[
"Sharma",
"Neelesh",
""
]
] | Two-body hadronic weak decays of Bc meson involving tensor meson in the final state are studied by using Isgur- Scora-Grinstein-Wise (ISGW II) model. Decay amplitudes are obtained using the factorization scheme in the Spectator Quark Model. Branching ratios for the charm changing and bottom changing decay modes are predicted. |
hep-ph/0004001 | null | Howard Baer, Pedro G. Mercadante, Xerxes Tata and Yili Wang | The Reach of the CERN Large Hadron Collider for Gauge-Mediated
Supersymmetry Breaking Models | 30 page Revtex file plus 12 EPS figures | Phys.Rev. D62 (2000) 095007 | 10.1103/PhysRevD.62.095007 | FSU-HEP-000328, UH-511-958-00 | hep-ph | null | We examine signals for sparticle production at the CERN Large Hadron Collider
(LHC) within the framework of gauge mediated supersymmetry breaking models with
a low SUSY breaking scale for four different model lines, each of which leads
to qualitatively different signatures. We first examine the reach of the LHC
via the canonical E_T^miss and multilepton channels that have been advocated
within the mSUGRA framework. Next, we examine special features of each of these
model lines that could serve to further enhance the SUSY signal over Standard
Model backgrounds. We use ISAJET to evaluate the SUSY reach of experiments at
the LHC. We find that the SUSY reach, measured in terms of m(gluino), is at
least as large, and sometimes larger, than in the mSUGRA framework. In the best
case of the co-NLSP scenario, the reach extends to m(gluino) >~ 3 TeV, assuming
10 fb^-1 of integrated luminosity.
| [
{
"created": "Mon, 3 Apr 2000 20:00:54 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Baer",
"Howard",
""
],
[
"Mercadante",
"Pedro G.",
""
],
[
"Tata",
"Xerxes",
""
],
[
"Wang",
"Yili",
""
]
] | We examine signals for sparticle production at the CERN Large Hadron Collider (LHC) within the framework of gauge mediated supersymmetry breaking models with a low SUSY breaking scale for four different model lines, each of which leads to qualitatively different signatures. We first examine the reach of the LHC via the canonical E_T^miss and multilepton channels that have been advocated within the mSUGRA framework. Next, we examine special features of each of these model lines that could serve to further enhance the SUSY signal over Standard Model backgrounds. We use ISAJET to evaluate the SUSY reach of experiments at the LHC. We find that the SUSY reach, measured in terms of m(gluino), is at least as large, and sometimes larger, than in the mSUGRA framework. In the best case of the co-NLSP scenario, the reach extends to m(gluino) >~ 3 TeV, assuming 10 fb^-1 of integrated luminosity. |
hep-ph/9503385 | null | B.Kerbikov | THE INTERPLAY OF THE K+K- ATOM AND THE f_0(975) RESONANCE | 13 pages | Z.Phys.A353:113-115,1995 | 10.1007/BF01297733 | ITEP 17-95 | hep-ph | null | We predict that production of the K+K- atom in pd-3^HeX and similar reactions
exhibits a drastic missing mass spectrum due to the interplay with f_0(975)
resonance. We point out that high precision studies of the K+K- atom may shed a
new light on the nature of f_0(975).
| [
{
"created": "Mon, 20 Mar 1995 16:58:35 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Kerbikov",
"B.",
""
]
] | We predict that production of the K+K- atom in pd-3^HeX and similar reactions exhibits a drastic missing mass spectrum due to the interplay with f_0(975) resonance. We point out that high precision studies of the K+K- atom may shed a new light on the nature of f_0(975). |
hep-ph/0010073 | Pallante | E. Pallante, A. Pich, I. Scimemi | The Standard Model prediction for eps'/eps | 3 pages, LaTex, uses ws-p10x7.cls. Talk given by E.P. at ICHEP2000,
Osaka, July 27-August 2, 2000 | null | null | null | hep-ph | null | We review fundamental aspects of a new Standard Model analysis of eps'/eps
which takes into account the strong enhancement induced by final state
interactions.
| [
{
"created": "Sun, 8 Oct 2000 20:26:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pallante",
"E.",
""
],
[
"Pich",
"A.",
""
],
[
"Scimemi",
"I.",
""
]
] | We review fundamental aspects of a new Standard Model analysis of eps'/eps which takes into account the strong enhancement induced by final state interactions. |
2407.01210 | Muhammad Rehman | Sajid Israr and Muhammad Rehman | Higgs Decay to $Z\gamma$ in the Minimal Supersymmetric Standard Model
and Its Nonholomorphic Extension | null | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Recent measurements of $ h \rightarrow Z \gamma $ from CMS and ATLAS indicate
an excess over Standard Model (SM) predictions, suggesting the presence of new
physics. In this work, we investigate the $ h \rightarrow Z \gamma $ decay
within the minimal supersymmetric standard model (MSSM) and its nonholomorphic
extension, the NHSSM. Calculations are performed using the FeynArts/FormCalc
setup, utilizing the pre-existing model file for MSSM and generating the NHSSM
model file with the support of {\tt SARAH}. In the allowed parameter space,
MSSM contributions to $h \rightarrow Z \gamma$ can significantly surpass SM
predictions reaching to the value $\Gamma(h \rightarrow Z \gamma)= 9.77 \times
10^{-6} \text{GeV}$, thereby bringing $ \Gamma (h \rightarrow Z \gamma) $
closer to the experimental value. The SM predicted value deviates from the
experimental value by $1.7 \sigma$. However, the MSSM contributions can reduce
this deviation to less than $1 \sigma$. In contrast, NHSSM contributions remain
negligible and do not produce sizable corrections to the $ h \rightarrow Z
\gamma $ decay width.
| [
{
"created": "Mon, 1 Jul 2024 11:56:38 GMT",
"version": "v1"
}
] | 2024-07-02 | [
[
"Israr",
"Sajid",
""
],
[
"Rehman",
"Muhammad",
""
]
] | Recent measurements of $ h \rightarrow Z \gamma $ from CMS and ATLAS indicate an excess over Standard Model (SM) predictions, suggesting the presence of new physics. In this work, we investigate the $ h \rightarrow Z \gamma $ decay within the minimal supersymmetric standard model (MSSM) and its nonholomorphic extension, the NHSSM. Calculations are performed using the FeynArts/FormCalc setup, utilizing the pre-existing model file for MSSM and generating the NHSSM model file with the support of {\tt SARAH}. In the allowed parameter space, MSSM contributions to $h \rightarrow Z \gamma$ can significantly surpass SM predictions reaching to the value $\Gamma(h \rightarrow Z \gamma)= 9.77 \times 10^{-6} \text{GeV}$, thereby bringing $ \Gamma (h \rightarrow Z \gamma) $ closer to the experimental value. The SM predicted value deviates from the experimental value by $1.7 \sigma$. However, the MSSM contributions can reduce this deviation to less than $1 \sigma$. In contrast, NHSSM contributions remain negligible and do not produce sizable corrections to the $ h \rightarrow Z \gamma $ decay width. |
hep-ph/9505421 | null | R. Kirschner | t-channel Approach to Reggeon Interactions in QCD | latex , 17 figures appended as compressed uuencoded eps files | Phys.Rev. D53 (1996) 1087-1097 | 10.1103/PhysRevD.53.1087 | null | hep-ph | null | Starting from the multi-Regge effective action for high-energy scattering in
QCD a $t$-channel approach can be developed which is similar to the approach by
White based on general Regge arguments. The BFKL kernel of reggeized gluon
interaction, contributions to the $2 \rightarrow 4 $ reggeized gluon vertex
function and the one-loop correction to the BFKL kernel are considered. The
conditions are discussed under which this approach can provide a simple
estimante of the next-to-leading logarithmic corrections to the BFKL
perturbative pomeron intercept.
| [
{
"created": "Tue, 30 May 1995 14:15:12 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Jun 1995 07:02:32 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Kirschner",
"R.",
""
]
] | Starting from the multi-Regge effective action for high-energy scattering in QCD a $t$-channel approach can be developed which is similar to the approach by White based on general Regge arguments. The BFKL kernel of reggeized gluon interaction, contributions to the $2 \rightarrow 4 $ reggeized gluon vertex function and the one-loop correction to the BFKL kernel are considered. The conditions are discussed under which this approach can provide a simple estimante of the next-to-leading logarithmic corrections to the BFKL perturbative pomeron intercept. |
1711.08910 | Mathieu Pellen | Ansgar Denner, Jean-Nicolas Lang, Mathieu Pellen, Sandro Uccirati | NLO QCD and EW corrections to processes involving off-shell top quarks | 6 pages, 6 figures. Contribution to the proceedings of the 13th
International Symposium on Radiative Corrections (RADCOR 2017) | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review recent results on next-to-leading order (NLO) QCD and electroweak
(EW) corrections for processes involving off-shell top quarks. For the
off-shell production of two top quarks that decay leptonically, the full NLO EW
corrections have been computed. For the very same process in association with a
Higgs boson, EW corrections have been calculated and combined with existing NLO
QCD corrections. In both cases, selected differential distributions are shown.
In these proceedings, particular emphasis is put on the effect of the EW
corrections as well as the off-shell contributions.
| [
{
"created": "Fri, 24 Nov 2017 10:08:36 GMT",
"version": "v1"
}
] | 2017-11-27 | [
[
"Denner",
"Ansgar",
""
],
[
"Lang",
"Jean-Nicolas",
""
],
[
"Pellen",
"Mathieu",
""
],
[
"Uccirati",
"Sandro",
""
]
] | We review recent results on next-to-leading order (NLO) QCD and electroweak (EW) corrections for processes involving off-shell top quarks. For the off-shell production of two top quarks that decay leptonically, the full NLO EW corrections have been computed. For the very same process in association with a Higgs boson, EW corrections have been calculated and combined with existing NLO QCD corrections. In both cases, selected differential distributions are shown. In these proceedings, particular emphasis is put on the effect of the EW corrections as well as the off-shell contributions. |
1611.06518 | Alexander Rothkopf | Alexander Rothkopf | Quarkonia at $T>0$ and lattice QCD | 11 pages, 9 figures, talk given at the XIIth Quark Confinement and
the Hadron Spectrum conference, Thessaloniki, Greece | null | 10.1051/epjconf/201713707018 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report here on recent progress in the determination of S-wave and P-wave
heavy-quarkonium states at finite temperature. Our results are based on the
combination of effective field theories with numerical lattice QCD simulations.
These non-perturbative tools allow us to compute the heavy-quarkonium in-medium
spectral functions, from which we in turn determine the melting temperatures of
individual states and estimate phenomenologically relevant observables, such as
the $\psi^\prime$ to J/$\psi$ ratio in heavy-ion collisions.
| [
{
"created": "Sun, 20 Nov 2016 14:06:26 GMT",
"version": "v1"
}
] | 2017-04-05 | [
[
"Rothkopf",
"Alexander",
""
]
] | We report here on recent progress in the determination of S-wave and P-wave heavy-quarkonium states at finite temperature. Our results are based on the combination of effective field theories with numerical lattice QCD simulations. These non-perturbative tools allow us to compute the heavy-quarkonium in-medium spectral functions, from which we in turn determine the melting temperatures of individual states and estimate phenomenologically relevant observables, such as the $\psi^\prime$ to J/$\psi$ ratio in heavy-ion collisions. |
1109.1785 | Arkady Vainshtein | M. Shifman, A. Vainshtein, M. B. Voloshin, and V. Zakharov | Higgs Decay into Two Photons through the W-boson Loop: No Decoupling in
the m_W --> 0 Limit | 7 pages, no figures; the version accepted for publication in Physical
Review | null | 10.1103/PhysRevD.85.013015 | FTPI-MINN-11/21, UMN-TH-3011/11 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reanalyze the W-boson loop in the amplitude of the Higgs decay into two
photons to show the absence of decoupling in the limit of massless W bosons,
m_W --> 0. The Higgs coupling to longitudinal polarizations survive in this
limit and generates a nonvanishing contribution in the $H\to \gamma\gamma$
decay. This shows that the recent claim of decoupling by R. Gastmans, S.L. Wu,
and T.T. Wu is incorrect, and the old calculations for the two photon decay
well known in the literature are valid.
| [
{
"created": "Thu, 8 Sep 2011 17:32:05 GMT",
"version": "v1"
},
{
"created": "Sat, 1 Oct 2011 14:43:36 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Dec 2011 08:05:16 GMT",
"version": "v3"
}
] | 2013-05-30 | [
[
"Shifman",
"M.",
""
],
[
"Vainshtein",
"A.",
""
],
[
"Voloshin",
"M. B.",
""
],
[
"Zakharov",
"V.",
""
]
] | We reanalyze the W-boson loop in the amplitude of the Higgs decay into two photons to show the absence of decoupling in the limit of massless W bosons, m_W --> 0. The Higgs coupling to longitudinal polarizations survive in this limit and generates a nonvanishing contribution in the $H\to \gamma\gamma$ decay. This shows that the recent claim of decoupling by R. Gastmans, S.L. Wu, and T.T. Wu is incorrect, and the old calculations for the two photon decay well known in the literature are valid. |
2208.07867 | Gayatri Ghosh Dr. | Gayatri Ghosh | Majorana Neutrinos and Clockworked Yukawa Couplings contribution to
non-observation of the rare leptonic decay $ l_{i}\rightarrow l_{j} \gamma $,
Clockwork Photon and Clockwork Graviton | 14 pages, 7 figures, presented at NuFact 2022, The 23rd International
Workshop on Neutrinos from Accelerators, University of UTAH, USA | LHEP 2023 (2023) 351 | 10.31526/lhep.2023.351 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The clockwork is an extra-dimensional set-up for generating light particles
with exponentially suppressed or hierarchical couplings of light particles with
N massive states having comparable masses near the threshold scale of the
mechanism in theories which contain no small parameters at the fundamental
level. We explore the prospect of charged lepton flavour violation (cLFV) in a
clockwork framework which encompasses Dirac mass terms as well as Majorana mass
terms for the new clockwork fermions. We deive the masses of the non zero
clockwork Majorana masses, and new particles in a clockwork framework and for
their Yukawa couplings to the lepton doublets, in the framework where the
clockwork parameters are universal. When the new clockwork Majorana masses are
non zero, neutrino masses are generated as a result from the exchange of heavy
messenger particles such as right handed iso$-$singlet neutrinos or iso$ -
$triplet scalar bosons known as the seesaw mechanism. In the case of non zero
clockwork Majorana masses, owing to the sizable effective Yukawa couplings of
the higher mass modes neutrino masses can only be made tiny by conjecturing
large Majorana mass in the teraelectron volt range for allthe clockwork gears.
This is apparent from the constraints on the mass scale of the clockwork
fermions due to the non-observation of the rare cLFV decay $ \mu\rightarrow
e\gamma $, $ \tau \rightarrow \mu \gamma $, $ \tau\rightarrow e\gamma $. A
general description of the clockwork mechanism valid for fermions, gauge
bosons, and gravitons is discussed here. This mechanism can be implemented with
a discrete set of new fields or, in its continuum version, through an extra
spatial dimension.
| [
{
"created": "Tue, 16 Aug 2022 17:52:37 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Oct 2022 16:39:01 GMT",
"version": "v2"
}
] | 2023-02-06 | [
[
"Ghosh",
"Gayatri",
""
]
] | The clockwork is an extra-dimensional set-up for generating light particles with exponentially suppressed or hierarchical couplings of light particles with N massive states having comparable masses near the threshold scale of the mechanism in theories which contain no small parameters at the fundamental level. We explore the prospect of charged lepton flavour violation (cLFV) in a clockwork framework which encompasses Dirac mass terms as well as Majorana mass terms for the new clockwork fermions. We deive the masses of the non zero clockwork Majorana masses, and new particles in a clockwork framework and for their Yukawa couplings to the lepton doublets, in the framework where the clockwork parameters are universal. When the new clockwork Majorana masses are non zero, neutrino masses are generated as a result from the exchange of heavy messenger particles such as right handed iso$-$singlet neutrinos or iso$ - $triplet scalar bosons known as the seesaw mechanism. In the case of non zero clockwork Majorana masses, owing to the sizable effective Yukawa couplings of the higher mass modes neutrino masses can only be made tiny by conjecturing large Majorana mass in the teraelectron volt range for allthe clockwork gears. This is apparent from the constraints on the mass scale of the clockwork fermions due to the non-observation of the rare cLFV decay $ \mu\rightarrow e\gamma $, $ \tau \rightarrow \mu \gamma $, $ \tau\rightarrow e\gamma $. A general description of the clockwork mechanism valid for fermions, gauge bosons, and gravitons is discussed here. This mechanism can be implemented with a discrete set of new fields or, in its continuum version, through an extra spatial dimension. |
2111.03912 | Sonny Mantry | Yulia Furletova, Sonny Mantry | Probing charged lepton flavor violation with a positron beam at CEBAF
(JLAB) | 6 pages, 6 figures, references added. arXiv admin note: substantial
text overlap with arXiv:2007.15081 | European Physical Journal A 57(315), 2021 | 10.1140/epja/s10050-021-00624-3 | null | hep-ph hep-ex nucl-ex | http://creativecommons.org/licenses/by/4.0/ | The addition of a high intensity 11 GeV polarized positron beam at the
Continuous Electron Beam Accelerator Facility (CEBAF) at JLAB would allow for a
search of Charged Lepton Flavor Violation (CLFV) via the process $e^+N
\rightarrow \mu^+ X$. The proposed Solenoidal Large Intensity Detector (SoLID)
spectrometer, in the configuration with muon chambers, would be ideal for such
CLFV searches. Various new physics scenarios, including the phenomenologically
convenient Leptoquark (LQ) framework, predict CLFV rates that are within reach
of current or planned experiments. A positron beam with instantaneous
luminosity, ${\cal L}\sim 10^{38}$ cm$^{-2}$s$^{-1}$, could improve on existing
HERA limits by two or three orders of magnitude. The availability of positron
beam polarization would also allow for distentangling CLFV effects mediated by
left-handed vs. right-handed LQs.
| [
{
"created": "Sat, 6 Nov 2021 16:15:54 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Nov 2021 18:23:42 GMT",
"version": "v2"
}
] | 2021-11-23 | [
[
"Furletova",
"Yulia",
""
],
[
"Mantry",
"Sonny",
""
]
] | The addition of a high intensity 11 GeV polarized positron beam at the Continuous Electron Beam Accelerator Facility (CEBAF) at JLAB would allow for a search of Charged Lepton Flavor Violation (CLFV) via the process $e^+N \rightarrow \mu^+ X$. The proposed Solenoidal Large Intensity Detector (SoLID) spectrometer, in the configuration with muon chambers, would be ideal for such CLFV searches. Various new physics scenarios, including the phenomenologically convenient Leptoquark (LQ) framework, predict CLFV rates that are within reach of current or planned experiments. A positron beam with instantaneous luminosity, ${\cal L}\sim 10^{38}$ cm$^{-2}$s$^{-1}$, could improve on existing HERA limits by two or three orders of magnitude. The availability of positron beam polarization would also allow for distentangling CLFV effects mediated by left-handed vs. right-handed LQs. |
hep-ph/0701207 | Francois Arleo | Francois Arleo | Photon-tagged correlations in heavy-ion collisions: kinematic
requirements and a case study | 4 pages, 2 figures. To appear in the proceedings of the 19th
International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions
(QM2006), Shanghai, China, 14-20 November 2006 | J.Phys.G34:S1037-1040,2007 | 10.1088/0954-3899/34/8/S151 | CERN-PH-TH/2007-005; LAPTH-1173/07 | hep-ph nucl-ex nucl-th | null | Photon-tagged correlations may be useful to determine how the dense partonic
medium produced in heavy-ion collisions affects the fragmentation of
high-energy quarks and gluons into a leading hadron. In these proceedings, I
discuss the kinematic requirements for the hadron and the prompt photon
transverse momentum cuts. A case study at LHC energy, tagging on p_T > 20 GeV
and p_T > 50 GeV photons, is then briefly examined.
| [
{
"created": "Wed, 24 Jan 2007 17:20:17 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Arleo",
"Francois",
""
]
] | Photon-tagged correlations may be useful to determine how the dense partonic medium produced in heavy-ion collisions affects the fragmentation of high-energy quarks and gluons into a leading hadron. In these proceedings, I discuss the kinematic requirements for the hadron and the prompt photon transverse momentum cuts. A case study at LHC energy, tagging on p_T > 20 GeV and p_T > 50 GeV photons, is then briefly examined. |
1604.06724 | Ricardo Gonzalez Felipe | R. Gonzalez Felipe, H. Serodio | Maximally restrictive leptonic texture zeros in two-Higgs-doublet models | 13 pages, 5 figures, 5 tables; comments and references added, final
version to appear in J. Phys. G | null | 10.1088/1361-6471/aa659b | CFTP/16-008 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The implementation of maximally restrictive texture zeros in the leptonic
sector is investigated in the context of two-Higgs-doublet models with Majorana
neutrinos. After analyzing all maximally restrictive pairs of leptonic mass
matrices with zero entries, we conclude that there are only four texture
combinations that are compatible with observations at 3 sigma confidence level
and can be implemented through Abelian symmetries in a two-Higgs-doublet model.
The compatibility of these textures with current constraints on
lepton-flavor-violating processes is also studied. The ultraviolet completion
of these models is discussed in the framework of the seesaw mechanism for
neutrino masses.
| [
{
"created": "Fri, 22 Apr 2016 16:03:22 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Dec 2016 15:49:39 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Mar 2017 18:53:00 GMT",
"version": "v3"
}
] | 2017-05-24 | [
[
"Felipe",
"R. Gonzalez",
""
],
[
"Serodio",
"H.",
""
]
] | The implementation of maximally restrictive texture zeros in the leptonic sector is investigated in the context of two-Higgs-doublet models with Majorana neutrinos. After analyzing all maximally restrictive pairs of leptonic mass matrices with zero entries, we conclude that there are only four texture combinations that are compatible with observations at 3 sigma confidence level and can be implemented through Abelian symmetries in a two-Higgs-doublet model. The compatibility of these textures with current constraints on lepton-flavor-violating processes is also studied. The ultraviolet completion of these models is discussed in the framework of the seesaw mechanism for neutrino masses. |
hep-ph/0402084 | Nobuyuki Sawado | Nobuyuki Sawado, Noriko Shiiki | Degeneracy of the quarks, shell structure in the chiral soliton | 22 pages, 6 figures, to appear in Nuclear Physics A. The figures of
the baryon density plot are removed from this article because of their size,
which will exist in the published version | Nucl.Phys. A739 (2004) 89-108 | 10.1016/j.nuclphysa.2004.03.147 | null | hep-ph | null | We obtain multi-soliton solutions with discrete symmetries in the chiral
quark soliton model using the rational map ansatz. The solutions exhibit
degenerate bound spectra of the quark orbits depending on the background of
pion field configurations. It is shown that resultant baryon densities inherit
the same discrete symmetries as the chiral fields. Evaluating the radial
component of the baryon density, shell-like structure of the valence quark
spectra is also observed.
| [
{
"created": "Mon, 9 Feb 2004 00:30:58 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Sawado",
"Nobuyuki",
""
],
[
"Shiiki",
"Noriko",
""
]
] | We obtain multi-soliton solutions with discrete symmetries in the chiral quark soliton model using the rational map ansatz. The solutions exhibit degenerate bound spectra of the quark orbits depending on the background of pion field configurations. It is shown that resultant baryon densities inherit the same discrete symmetries as the chiral fields. Evaluating the radial component of the baryon density, shell-like structure of the valence quark spectra is also observed. |
1806.00660 | Fredrik Bj\"orkeroth | Fredrik Bj\"orkeroth, Eung Jin Chun, Stephen F. King | Flavourful Axion Phenomenology | v1: 27 pages. v2: version to appear in JHEP. 31 pages. Extended
discussion on axion basis, updated mixing bounds | null | 10.1007/JHEP08(2018)117 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a comprehensive discussion of the phenomenology of flavourful
axions, including both standard Peccei-Quinn (PQ) axions, associated with the
solution to the strong $CP$ problem, and non-standard axion-like particles
(ALPs). We give the flavourful axion-fermion and axion-photon couplings and
calculate the branching ratios of heavy meson ($K$, $D$, $B$) decays involving
a flavourful axion. We also calculate the mixing between axions and heavy
mesons $ K^0 $, $ D^0 $, $ B^0 $ and $ B_s^0 $, which affects the meson
oscillation probability and mass difference. Mixing also contributes to meson
decays into axions and axion decays into two photons, and may be relevant for
ALPs. We discuss charged lepton flavour-violating decays involving final state
axions of the form $\ell_1 \to \ell_2 a (\gamma) $, as well as $ \mu \to eee $
and $ \mu-e $ conversion. Finally we describe the phenomenology of a particular
"A to Z" Pati-Salam model, in which PQ symmetry arises accidentally due to
discrete flavour symmetry. Here all axion couplings are fixed by a fit to
flavour data, leading to sharp predictions and correlations between
flavour-dependent observables.
| [
{
"created": "Sat, 2 Jun 2018 16:13:44 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Aug 2018 10:35:29 GMT",
"version": "v2"
}
] | 2018-09-26 | [
[
"Björkeroth",
"Fredrik",
""
],
[
"Chun",
"Eung Jin",
""
],
[
"King",
"Stephen F.",
""
]
] | We present a comprehensive discussion of the phenomenology of flavourful axions, including both standard Peccei-Quinn (PQ) axions, associated with the solution to the strong $CP$ problem, and non-standard axion-like particles (ALPs). We give the flavourful axion-fermion and axion-photon couplings and calculate the branching ratios of heavy meson ($K$, $D$, $B$) decays involving a flavourful axion. We also calculate the mixing between axions and heavy mesons $ K^0 $, $ D^0 $, $ B^0 $ and $ B_s^0 $, which affects the meson oscillation probability and mass difference. Mixing also contributes to meson decays into axions and axion decays into two photons, and may be relevant for ALPs. We discuss charged lepton flavour-violating decays involving final state axions of the form $\ell_1 \to \ell_2 a (\gamma) $, as well as $ \mu \to eee $ and $ \mu-e $ conversion. Finally we describe the phenomenology of a particular "A to Z" Pati-Salam model, in which PQ symmetry arises accidentally due to discrete flavour symmetry. Here all axion couplings are fixed by a fit to flavour data, leading to sharp predictions and correlations between flavour-dependent observables. |
1309.6220 | Asmaa Shalaby Mrs. | A.G.Shalaby | A study on the deconfined degree of freedom (g1) and the running
coupling constant (alpha_s(T)) | 5 pages,4 figures. arXiv admin note: text overlap with
arXiv:nucl-th/9905005 by other authors | International Journal of Physical Sciences Vol. 7(11), pp. 1741 -
1745, 9 March, 2012 | 10.5897/IJPS11.1717 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quark gluon plasma is a novel state of matter in which quarks are no
longer confined to bound states such as baryons and mesons. the freezing of
quarkvgluon deconfined degrees of freedom is the essential ingredient in
determining the conditions in a transition between phases that has time to
develop into equilibrium. The degree of freedom in the confined hadronic matter
phase and the deconfined phase, that is, the QGP, is important in the study of
phase transition in the early universe. It is calculated according to the
strong coupling constant. But in the present work, we try to figure out the
effect of the running coupling constant in the calculation of the degree of
freedom, the latent heat and the critical pressure in the confined-deconfined
phase of matter
| [
{
"created": "Mon, 23 Sep 2013 19:07:37 GMT",
"version": "v1"
}
] | 2013-09-25 | [
[
"Shalaby",
"A. G.",
""
]
] | The quark gluon plasma is a novel state of matter in which quarks are no longer confined to bound states such as baryons and mesons. the freezing of quarkvgluon deconfined degrees of freedom is the essential ingredient in determining the conditions in a transition between phases that has time to develop into equilibrium. The degree of freedom in the confined hadronic matter phase and the deconfined phase, that is, the QGP, is important in the study of phase transition in the early universe. It is calculated according to the strong coupling constant. But in the present work, we try to figure out the effect of the running coupling constant in the calculation of the degree of freedom, the latent heat and the critical pressure in the confined-deconfined phase of matter |
1107.0717 | Mariangela Lisanti | Patrick J. Fox, Joachim Kopp, Mariangela Lisanti, Neal Weiner | A CoGeNT Modulation Analysis | 28 pages, 14 figures, 3 tables; revised version has minor corrections
to figure captions | null | 10.1103/PhysRevD.85.036008 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the recently released CoGeNT data with a focus on their
time-dependent properties. Using various statistical techniques, we confirm the
presence of modulation in the data, and find a significant component at high
(E_{ee} > 1.5$ keVee) energies. We find that standard elastic WIMPs in a
Maxwellian halo do not provide a good description of the modulation. We
consider the possibility of non-standard halos, using halo independent
techniques, and find a good agreement with the DAMA modulation for Q_{Na}
\approx 0.3, but disfavoring interpretations with Q_{Na} = 0.5. The same
techniques indicate that CDMS-Ge should see an O(1) modulation, and XENON100
should have seen 10-30 events (based upon the modulation in the 1.5-3.1 keVee
range), unless L_{eff} is smaller than recent measurements. Models such as
inelastic dark matter provide a good fit to the modulation, but not the
spectrum. We note that tensions with XENON could be alleviated in such models
if the peak is dominantly in April, when XENON data are not available due to
noise.
| [
{
"created": "Mon, 4 Jul 2011 19:59:38 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Aug 2011 23:21:01 GMT",
"version": "v2"
},
{
"created": "Fri, 9 Mar 2012 18:38:28 GMT",
"version": "v3"
}
] | 2013-05-30 | [
[
"Fox",
"Patrick J.",
""
],
[
"Kopp",
"Joachim",
""
],
[
"Lisanti",
"Mariangela",
""
],
[
"Weiner",
"Neal",
""
]
] | We analyze the recently released CoGeNT data with a focus on their time-dependent properties. Using various statistical techniques, we confirm the presence of modulation in the data, and find a significant component at high (E_{ee} > 1.5$ keVee) energies. We find that standard elastic WIMPs in a Maxwellian halo do not provide a good description of the modulation. We consider the possibility of non-standard halos, using halo independent techniques, and find a good agreement with the DAMA modulation for Q_{Na} \approx 0.3, but disfavoring interpretations with Q_{Na} = 0.5. The same techniques indicate that CDMS-Ge should see an O(1) modulation, and XENON100 should have seen 10-30 events (based upon the modulation in the 1.5-3.1 keVee range), unless L_{eff} is smaller than recent measurements. Models such as inelastic dark matter provide a good fit to the modulation, but not the spectrum. We note that tensions with XENON could be alleviated in such models if the peak is dominantly in April, when XENON data are not available due to noise. |
hep-ph/9804460 | Frank Eberlein | Frank Eberlein (DESY) | Two-Loop Gap Equations for the Magnetic Mass | 10 pages, 1 figure, LaTeX | Phys.Lett. B439 (1998) 130-136 | 10.1016/S0370-2693(98)01004-1 | DESY 98-048 | hep-ph | null | One-loop gap equations have recently been used by several authors to estimate
the non-perturbative mass gap in a 3-dimensional gauge theory. I extend the
method to two loops and demonstrate, that the resulting gap equation has a real
and positive solution $m \simeq 0.34 g^2$, which is in good agreement with the
one-loop results and lattice data.
| [
{
"created": "Thu, 30 Apr 1998 14:56:56 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Eberlein",
"Frank",
"",
"DESY"
]
] | One-loop gap equations have recently been used by several authors to estimate the non-perturbative mass gap in a 3-dimensional gauge theory. I extend the method to two loops and demonstrate, that the resulting gap equation has a real and positive solution $m \simeq 0.34 g^2$, which is in good agreement with the one-loop results and lattice data. |
1309.7743 | Kanako Yamazaki | Kanako Yamazaki and T. Matsui | Quark-hadron phase transition in a three flavor PNJL model | 4 pages, 3 figures, proceedings of Strangeness in Quark Matter 2013,
July 22-27, 2013, Birmingham, UK | null | 10.1088/1742-6596/509/1/012051 | UT-Komaba/13-13 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the quark-hadron phase transition by using a three flavor
Nambu-Jona-Lasinio model with the Polyakov loop at zero chemical potential,
extending our previous work with two flavor model. We show that the equation of
state at low temperatures is dominated by pions and kaons as collective modes
of quarks and anti-quarks. As temperature increases, mesonic collective modes
melt into the continuum of quark and anti-quark so that hadronic phase changes
continuously to the quark phase where quark excitations dominate pressure.
| [
{
"created": "Mon, 30 Sep 2013 07:31:26 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Yamazaki",
"Kanako",
""
],
[
"Matsui",
"T.",
""
]
] | We study the quark-hadron phase transition by using a three flavor Nambu-Jona-Lasinio model with the Polyakov loop at zero chemical potential, extending our previous work with two flavor model. We show that the equation of state at low temperatures is dominated by pions and kaons as collective modes of quarks and anti-quarks. As temperature increases, mesonic collective modes melt into the continuum of quark and anti-quark so that hadronic phase changes continuously to the quark phase where quark excitations dominate pressure. |
hep-ph/0601127 | Shelley Page | Michael J. Ramsey-Musolf and Shelley A. Page | Hadronic Parity Violation: a New View through the Looking Glass | Manuscript submitted to Annual Reviews of Nuclear and Particle
Science | Ann.Rev.Nucl.Part.Sci.56:1-52,2006 | 10.1146/annurev.nucl.54.070103.181255 | null | hep-ph nucl-ex nucl-th | null | Studies of the strangeness changing hadronic weak interaction have produced a
number of puzzles that have so far evaded a complete explanation within the
Standard Model. Their origin may lie either in dynamics peculiar to weak
interactions involving strange quarks or in more general aspects of the
interplay between strong and weak interactions. In principle, studies of the
strangeness conserving hadronic weak interaction using parity violating
hadronic and nuclear observables provide a complementary window on this
question. However, progress in this direction has been hampered by the lack of
a suitable theoretical framework for interpreting hadronic parity violation
measurements in a model-independent way. Recent work involving effective field
theory ideas has led to the formulation of such a framework while motivating
the development of a number of new hadronic parity violation experiments in
few-body systems. In this article, we review these recent developments and
discuss the prospects and opportunities for further experimental and
theoretical progress.
| [
{
"created": "Tue, 17 Jan 2006 00:11:24 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ramsey-Musolf",
"Michael J.",
""
],
[
"Page",
"Shelley A.",
""
]
] | Studies of the strangeness changing hadronic weak interaction have produced a number of puzzles that have so far evaded a complete explanation within the Standard Model. Their origin may lie either in dynamics peculiar to weak interactions involving strange quarks or in more general aspects of the interplay between strong and weak interactions. In principle, studies of the strangeness conserving hadronic weak interaction using parity violating hadronic and nuclear observables provide a complementary window on this question. However, progress in this direction has been hampered by the lack of a suitable theoretical framework for interpreting hadronic parity violation measurements in a model-independent way. Recent work involving effective field theory ideas has led to the formulation of such a framework while motivating the development of a number of new hadronic parity violation experiments in few-body systems. In this article, we review these recent developments and discuss the prospects and opportunities for further experimental and theoretical progress. |
2005.11867 | Peter Graham | Peter W. Graham, Selcuk Haciomeroglu, David E. Kaplan, Zhanibek
Omarov, Surjeet Rajendran and Yannis K. Semertzidis | Storage Ring Probes of Dark Matter and Dark Energy | 19 pages, 7 figures | Phys. Rev. D 103, 055010 (2021) | 10.1103/PhysRevD.103.055010 | null | hep-ph hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that proton storage ring experiments designed to search for proton
electric dipole moments can also be used to look for the nearly dc spin
precession induced by dark energy and ultra-light dark matter. These
experiments are sensitive to both axion-like and vector fields. Current
technology permits probes of these phenomena up to three orders of magnitude
beyond astrophysical limits. The relativistic boost of the protons in these
rings allows this scheme to have sensitivities comparable to atomic
co-magnetometer experiments that can also probe similar phenomena. These
complementary approaches can be used to extract the micro-physics of a signal,
allowing us to distinguish between pseudo-scalar, magnetic and electric dipole
moment interactions.
| [
{
"created": "Mon, 25 May 2020 00:22:53 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Mar 2021 21:21:33 GMT",
"version": "v2"
}
] | 2021-03-24 | [
[
"Graham",
"Peter W.",
""
],
[
"Haciomeroglu",
"Selcuk",
""
],
[
"Kaplan",
"David E.",
""
],
[
"Omarov",
"Zhanibek",
""
],
[
"Rajendran",
"Surjeet",
""
],
[
"Semertzidis",
"Yannis K.",
""
]
] | We show that proton storage ring experiments designed to search for proton electric dipole moments can also be used to look for the nearly dc spin precession induced by dark energy and ultra-light dark matter. These experiments are sensitive to both axion-like and vector fields. Current technology permits probes of these phenomena up to three orders of magnitude beyond astrophysical limits. The relativistic boost of the protons in these rings allows this scheme to have sensitivities comparable to atomic co-magnetometer experiments that can also probe similar phenomena. These complementary approaches can be used to extract the micro-physics of a signal, allowing us to distinguish between pseudo-scalar, magnetic and electric dipole moment interactions. |
0705.1713 | Michael Lublinsky | Alex Kovner, Michael Lublinsky and Urs Wiedemann | From bubbles to foam: dilute to dense evolution of hadronic wave
function at high energy | 30 pages | JHEP 0706:075,2007 | 10.1088/1126-6708/2007/06/075 | null | hep-ph hep-th | null | We derive the evolution of a hadronic light cone wave function with energy at
weak coupling. Our derivation is valid both in the high and the low partonic
density limit, and thus encompasses both the JIMWLK and the KLWMIJ evolution.
The hadronic wave function is shown to evolve by the action of the
Bogoliubov-type operator, which diagonalizes on the soft gluon sector the
light-cone hamiltonian in the presence of an arbitrary valence charge density.
We find explicitly the action of this operator on the soft as well as the
valence degrees of freedom of the theory.
| [
{
"created": "Fri, 11 May 2007 19:27:34 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Kovner",
"Alex",
""
],
[
"Lublinsky",
"Michael",
""
],
[
"Wiedemann",
"Urs",
""
]
] | We derive the evolution of a hadronic light cone wave function with energy at weak coupling. Our derivation is valid both in the high and the low partonic density limit, and thus encompasses both the JIMWLK and the KLWMIJ evolution. The hadronic wave function is shown to evolve by the action of the Bogoliubov-type operator, which diagonalizes on the soft gluon sector the light-cone hamiltonian in the presence of an arbitrary valence charge density. We find explicitly the action of this operator on the soft as well as the valence degrees of freedom of the theory. |
2103.13480 | Matteo Rinaldi | Matteo Rinaldi and Federico Alberto Ceccopieri | Enlighting the transverse structure of the proton via double parton
scattering in photon-induced interactions | 10 pages, 4 figures. Accepted version in Physical Review D letters.
Added i) more details on the analyses presented ii) supplemental material
iii) new calculations of the single parton scattering four jet
photo-production cross-section | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present paper we address double parton scattering (DPS) in quasi-real
photon-proton interactions. By using electromagnetic and hadronic models of the
photon light cone wave functions, we compute the so-called effective
cross-section, $\sigma_{eff}^{\gamma p}$ which allows us to calculate the DPS
contribution to these processes under dedicated assumptions. In particular, for
the four-jet photoproduction in HERA kinematics we found a sizeable DPS
contribution. We show that if the photon virtuality $Q^2$ could be measured and
thus the dependence of $\sigma_{eff}^{\gamma p}$ on such a parameter exposed,
information on the transverse distance between partons active in proton could
be extracted. To this aim, we set lower limits on the integrated luminosity
needed to observe such an effect which would allow the extraction of novel
information on the proton structure.
| [
{
"created": "Wed, 24 Mar 2021 20:54:14 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jan 2022 08:47:39 GMT",
"version": "v2"
}
] | 2022-01-05 | [
[
"Rinaldi",
"Matteo",
""
],
[
"Ceccopieri",
"Federico Alberto",
""
]
] | In the present paper we address double parton scattering (DPS) in quasi-real photon-proton interactions. By using electromagnetic and hadronic models of the photon light cone wave functions, we compute the so-called effective cross-section, $\sigma_{eff}^{\gamma p}$ which allows us to calculate the DPS contribution to these processes under dedicated assumptions. In particular, for the four-jet photoproduction in HERA kinematics we found a sizeable DPS contribution. We show that if the photon virtuality $Q^2$ could be measured and thus the dependence of $\sigma_{eff}^{\gamma p}$ on such a parameter exposed, information on the transverse distance between partons active in proton could be extracted. To this aim, we set lower limits on the integrated luminosity needed to observe such an effect which would allow the extraction of novel information on the proton structure. |
0912.3799 | Juan Antonio Aguilar-Saavedra | F. del Aguila, J. A. Aguilar-Saavedra, M. Moretti, F. Piccinini, R.
Pittau, M. Treccani | Combined analysis of Z' -> t tbar and Z' -> t tbar j production for
vector resonance searches at LHC | LaTeX 17 pages, 13 PS figures | Phys.Lett.B685:302-308,2010 | 10.1016/j.physletb.2010.01.068 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have implemented a code for Z' + n jets production in ALPGEN, with Z'
decays into several final states, including l+ l- and t tbar. The MLM
prescription is used for matching the matrix element with the parton shower,
including in this way the leading soft and collinear corrections. In order to
demonstrate its capabilities, we perform a combined analysis of Z' -> t tbar
and Z' -> t tbar j production for a heavy leptophobic gauge boson. It is found
that the effect of the extra jet cannot only be accounted for by a K factor
multiplying the leading-order cross section. In fact, the combined analysis for
Z' -> t tbar and Z' -> t tbar j presented improves the statistical significance
of the signal by 25% (8.55 sigma versus 6.77 sigma for a Z' mass of 1 TeV),
compared with the results of an inclusive analysis carried out on the same
sample of t tbar + t tbar j events.
| [
{
"created": "Sun, 20 Dec 2009 13:09:42 GMT",
"version": "v1"
}
] | 2010-04-22 | [
[
"del Aguila",
"F.",
""
],
[
"Aguilar-Saavedra",
"J. A.",
""
],
[
"Moretti",
"M.",
""
],
[
"Piccinini",
"F.",
""
],
[
"Pittau",
"R.",
""
],
[
"Treccani",
"M.",
""
]
] | We have implemented a code for Z' + n jets production in ALPGEN, with Z' decays into several final states, including l+ l- and t tbar. The MLM prescription is used for matching the matrix element with the parton shower, including in this way the leading soft and collinear corrections. In order to demonstrate its capabilities, we perform a combined analysis of Z' -> t tbar and Z' -> t tbar j production for a heavy leptophobic gauge boson. It is found that the effect of the extra jet cannot only be accounted for by a K factor multiplying the leading-order cross section. In fact, the combined analysis for Z' -> t tbar and Z' -> t tbar j presented improves the statistical significance of the signal by 25% (8.55 sigma versus 6.77 sigma for a Z' mass of 1 TeV), compared with the results of an inclusive analysis carried out on the same sample of t tbar + t tbar j events. |
hep-ph/0201084 | Anton Rossikhin | Yuri Grats and Anton Rossikhin | Vacuum polarization near cosmic string in RS2 brane world | 8 pages, RevTeX4 | Mod.Phys.Lett. A17 (2002) 1207-1214 | 10.1142/S0217732302007296 | null | hep-ph | null | Gravitational field of cosmic strings in theories with extra spatial
dimensions must differ significantly from that in the Einstein's theory. This
means that all gravity induced properties of cosmic strings need to be revised
too. Here we consider the effect of vacuum polarization outside a straight
infinitely thin cosmic string embedded in a RS2 brane world. Perturbation
technique combined with the method of dimensional regularization is used to
calculate ${< T_{\mu}^{\nu} >}_{vac}^{ren}$ for a massless scalar field.
| [
{
"created": "Thu, 10 Jan 2002 23:39:40 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Grats",
"Yuri",
""
],
[
"Rossikhin",
"Anton",
""
]
] | Gravitational field of cosmic strings in theories with extra spatial dimensions must differ significantly from that in the Einstein's theory. This means that all gravity induced properties of cosmic strings need to be revised too. Here we consider the effect of vacuum polarization outside a straight infinitely thin cosmic string embedded in a RS2 brane world. Perturbation technique combined with the method of dimensional regularization is used to calculate ${< T_{\mu}^{\nu} >}_{vac}^{ren}$ for a massless scalar field. |
hep-ph/9603268 | Jean-Loic Kneur | A. Arhrib (LPM, Univ. Montpellier II), J.-L. Kneur (CERN) and G.
Moultaka (LPM, Univ. Montpellier II) | Radiative Contributions to TGC in the MSSM | 4 pages, Latex, 2 Postscript figures, tar'ed uuencoded files, To
appear in the Proceedings of the Physics with $e^+e^-$ Linear Colliders
Workshop, Annecy--Gran Sasso--Hamburg 1995, ed. P. Zerwas | null | null | null | hep-ph | null | We give a brief account of recent calculations of radiative contributions to
the Triple Gauge Couplings (TGC) from the Minimal Supersymmetric Standard Model
(MSSM), at a 500 GeV $e^+e^-$ collider. Our results indicate that, although
these MSSM virtual contributions indeed are of the order of the expected
accuracy on TGC measurements, the generally neglected box contributions to TGC
also are likely to be relevant at such high energies.
| [
{
"created": "Mon, 11 Mar 1996 16:13:38 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Arhrib",
"A.",
"",
"LPM, Univ. Montpellier II"
],
[
"Kneur",
"J. -L.",
"",
"CERN"
],
[
"Moultaka",
"G.",
"",
"LPM, Univ. Montpellier II"
]
] | We give a brief account of recent calculations of radiative contributions to the Triple Gauge Couplings (TGC) from the Minimal Supersymmetric Standard Model (MSSM), at a 500 GeV $e^+e^-$ collider. Our results indicate that, although these MSSM virtual contributions indeed are of the order of the expected accuracy on TGC measurements, the generally neglected box contributions to TGC also are likely to be relevant at such high energies. |
1709.04792 | Pablo Sanchez Puertas | Pablo Sanchez-Puertas | A theoretical study of meson transition form factors | PhD thesis; some typos corrected and requested references added | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this thesis we discuss a rational and data-based description of the
single- and double-virutal transition form factors of the lightest pseudoscalar
mesons. We obtain an accurate description of these in the spacelike and
low-energy timelike regions. The phenomenological applications are wide. Among
them, we discuss, the eta-eta' mixing, the rare pseudoscalar decays into a
lepton pair and the pseudoscalar-pole contribution to the hadronic
light-by-light part of the anomalous magnetic moment of the muon. In all these
cases we discuss and illustrate the relevance of employing a data-based
approach in order not to incur in potential systematic errors.
| [
{
"created": "Thu, 14 Sep 2017 13:42:30 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Mar 2018 16:35:07 GMT",
"version": "v2"
}
] | 2018-03-20 | [
[
"Sanchez-Puertas",
"Pablo",
""
]
] | In this thesis we discuss a rational and data-based description of the single- and double-virutal transition form factors of the lightest pseudoscalar mesons. We obtain an accurate description of these in the spacelike and low-energy timelike regions. The phenomenological applications are wide. Among them, we discuss, the eta-eta' mixing, the rare pseudoscalar decays into a lepton pair and the pseudoscalar-pole contribution to the hadronic light-by-light part of the anomalous magnetic moment of the muon. In all these cases we discuss and illustrate the relevance of employing a data-based approach in order not to incur in potential systematic errors. |
hep-ph/9701383 | Egidijus Norvaisa | A. Acus and E. Norvai\v{s}as | Stability of SU(2) Quantum Skyrmion and Static Properties of Nucleons | 7 pages, RevTex 3.1, no figures | null | null | null | hep-ph | null | The Skyrme model is considered quantum mechanically ab initio in various
irreducible representations of the SU(2) group. The canonical quantization
procedure yields negative mass correction ensuring existence of stabile soliton
solution even in chiral limit. The evaluated static properties of nucleons
(masses, magnetic moments, radii etc.) are in a good agreement with
experimental data.
| [
{
"created": "Mon, 27 Jan 1997 08:24:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Acus",
"A.",
""
],
[
"Norvaišas",
"E.",
""
]
] | The Skyrme model is considered quantum mechanically ab initio in various irreducible representations of the SU(2) group. The canonical quantization procedure yields negative mass correction ensuring existence of stabile soliton solution even in chiral limit. The evaluated static properties of nucleons (masses, magnetic moments, radii etc.) are in a good agreement with experimental data. |
hep-ph/9903369 | null | Kenneth Lane (Boston University) | Technihadron Production and Decay in Low-Scale Technicolor | 32 pages, LaTeX, with 14 postscript figures. Programming error for
technipion-pair production has been rectified, resulting in reduced rates for
these processes only; figures 3,8,12 and associated text are modified
accordingly; one reference added and minor clarifications made | Phys. Rev. D 60, 075007 (1999) | 10.1103/PhysRevD.60.075007 | BUHEP-99-4 | hep-ph hep-ex | null | We discuss the production and decay rates of the lightest color-singlet
technihadrons, spin-one rho_T and omega_T and spin-zero pi_T, in a minimal
``straw-man'' model of low-scale techicolor. The revised rho_T and omega_T
decay rates affect the technicolor searches planned for Run II of the Tevatron
Collider.
| [
{
"created": "Wed, 17 Mar 1999 00:44:07 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Mar 1999 14:47:05 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Mar 1999 17:20:35 GMT",
"version": "v3"
}
] | 2016-08-25 | [
[
"Lane",
"Kenneth",
"",
"Boston University"
]
] | We discuss the production and decay rates of the lightest color-singlet technihadrons, spin-one rho_T and omega_T and spin-zero pi_T, in a minimal ``straw-man'' model of low-scale techicolor. The revised rho_T and omega_T decay rates affect the technicolor searches planned for Run II of the Tevatron Collider. |
hep-ph/0509331 | Keith Olive | John Ellis, Dimitri Nanopoulos, Keith A. Olive, and Yudi Santoso | On the Higgs Mass in the CMSSM | 14 pages, 12 figures | Phys.Lett.B633:583-590,2006 | 10.1016/j.physletb.2005.12.012 | CERN-PH-TH/2005-173, UMN-TH-2416/05, FTPI-MINN-05/43, ACT-09-05,
MIFP-05-23 | hep-ph | null | We estimate the mass of the lightest neutral Higgs boson h in the minimal
supersymmetric extension of the Standard Model with universal soft
supersymmetry-breaking masses (CMSSM), subject to the available accelerator and
astrophysical constraints. For m_t = 174.3 GeV, we find that 114 GeV < m_h <
127 GeV and a peak in the tan beta distribution simeq 55. We observe two
distinct peaks in the distribution of m_h values, corresponding to two
different regions of the CMSSM parameter space. Values of m_h < 119 GeV
correspond to small values of the gaugino mass m_{1/2} and the soft trilinear
supersymmetry-breaking parameter A_0, lying along coannihilation strips, and
most of the allowed parameter sets are consistent with a supersymmetric
interpretation of the possibly discrepancy in g_mu - 2. On the other hand,
values of m_h > 119 GeV may correspond to much larger values of m_{1/2} and
A_0, lying in rapid-annihilation funnels. The favoured ranges of m_h vary with
m_t, the two peaks being more clearly separated for m_t = 178 GeV and merging
for m_t = 172.7 GeV. If the g_mu - 2 constraint is imposed, the mode of the m_h
distribution is quite stable, being sim 117 GeV for all the studied values of
m_t.
| [
{
"created": "Wed, 28 Sep 2005 17:31:57 GMT",
"version": "v1"
}
] | 2009-09-11 | [
[
"Ellis",
"John",
""
],
[
"Nanopoulos",
"Dimitri",
""
],
[
"Olive",
"Keith A.",
""
],
[
"Santoso",
"Yudi",
""
]
] | We estimate the mass of the lightest neutral Higgs boson h in the minimal supersymmetric extension of the Standard Model with universal soft supersymmetry-breaking masses (CMSSM), subject to the available accelerator and astrophysical constraints. For m_t = 174.3 GeV, we find that 114 GeV < m_h < 127 GeV and a peak in the tan beta distribution simeq 55. We observe two distinct peaks in the distribution of m_h values, corresponding to two different regions of the CMSSM parameter space. Values of m_h < 119 GeV correspond to small values of the gaugino mass m_{1/2} and the soft trilinear supersymmetry-breaking parameter A_0, lying along coannihilation strips, and most of the allowed parameter sets are consistent with a supersymmetric interpretation of the possibly discrepancy in g_mu - 2. On the other hand, values of m_h > 119 GeV may correspond to much larger values of m_{1/2} and A_0, lying in rapid-annihilation funnels. The favoured ranges of m_h vary with m_t, the two peaks being more clearly separated for m_t = 178 GeV and merging for m_t = 172.7 GeV. If the g_mu - 2 constraint is imposed, the mode of the m_h distribution is quite stable, being sim 117 GeV for all the studied values of m_t. |
2408.00190 | Sahabub Jahedi | Sahabub Jahedi, Abhik Sarkar | Exploring Optimal Sensitivity of Lepton Flavor Violating Effective
Couplings at the $e^+e^-$ Colliders | 26 pages, 13 figures, 10 tables | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We analyze lepton flavor violation (LFV) using the Standard Model Effective
Field Theory (SMEFT) framework at the future lepton colliders. Our focus is on
the associated production of tau lepton with electron/muon at the
electron-positron ($e^+e^-$) colliders, related to four-Fermi SMEFT effective
operators. To respect the upper limits on effective couplings from lepton
flavor violating tau decays, we conduct a cut-based analysis to achieve
sufficient signal significance. We utilize the optimal observable technique
(OOT) to estimate the optimal sensitivity of the effective couplings. The
impact of electron beam polarization and the interplay of signal and background
in enhancing the optimal sensitivity of the effective couplings are discussed
in detail. We find that the sensitivity of flavor-violating effective couplings
is enhanced by order of one for 3 TeV center of mass (CM) energy and 1000
$\rm{fb}^{-1}$ integrated luminosity at the $e^+e^-$ colliders.
| [
{
"created": "Wed, 31 Jul 2024 23:10:54 GMT",
"version": "v1"
}
] | 2024-08-02 | [
[
"Jahedi",
"Sahabub",
""
],
[
"Sarkar",
"Abhik",
""
]
] | We analyze lepton flavor violation (LFV) using the Standard Model Effective Field Theory (SMEFT) framework at the future lepton colliders. Our focus is on the associated production of tau lepton with electron/muon at the electron-positron ($e^+e^-$) colliders, related to four-Fermi SMEFT effective operators. To respect the upper limits on effective couplings from lepton flavor violating tau decays, we conduct a cut-based analysis to achieve sufficient signal significance. We utilize the optimal observable technique (OOT) to estimate the optimal sensitivity of the effective couplings. The impact of electron beam polarization and the interplay of signal and background in enhancing the optimal sensitivity of the effective couplings are discussed in detail. We find that the sensitivity of flavor-violating effective couplings is enhanced by order of one for 3 TeV center of mass (CM) energy and 1000 $\rm{fb}^{-1}$ integrated luminosity at the $e^+e^-$ colliders. |
hep-ph/9612217 | Carlos Lourenco | D. Kharzeev, C. Lourenco, M. Nardi and H. Satz | A Quantitative Analysis of Charmonium Suppression in Nuclear Collisions | 37 pages, 12 figures, uses epsfig style, LaTeX | Z.Phys.C74:307-318,1997 | 10.1007/s002880050392 | CERN-TH/96-328, BI-TP 96/53 | hep-ph nucl-th | null | Data from J/psi and psi' production in p-A collisions are used to determine
the cross section for absorption of pre-resonance charmonium in nuclear matter.
The J/psi suppression in O-Cu, O-U and S-U collisions is fully reproduced by
the corresponding nuclear absorption, while Pb-Pb collisions show an additional
suppression increasing with centrality. We study the onset of this change in
terms of hadronic comover interactions and conclude that so far no conventional
hadronic description can consistently account for all data. Deconfinement,
starting at a critical point determined by central S-U collisions, is in accord
with the observed suppression pattern.
| [
{
"created": "Sat, 30 Nov 1996 20:50:37 GMT",
"version": "v1"
}
] | 2009-07-09 | [
[
"Kharzeev",
"D.",
""
],
[
"Lourenco",
"C.",
""
],
[
"Nardi",
"M.",
""
],
[
"Satz",
"H.",
""
]
] | Data from J/psi and psi' production in p-A collisions are used to determine the cross section for absorption of pre-resonance charmonium in nuclear matter. The J/psi suppression in O-Cu, O-U and S-U collisions is fully reproduced by the corresponding nuclear absorption, while Pb-Pb collisions show an additional suppression increasing with centrality. We study the onset of this change in terms of hadronic comover interactions and conclude that so far no conventional hadronic description can consistently account for all data. Deconfinement, starting at a critical point determined by central S-U collisions, is in accord with the observed suppression pattern. |
2407.16488 | Xin Wang | Haipeng An, Tingyu Li, Jing Shu, Xin Wang, Xiao Xue, Yue Zhao | Dark Photon Dark Matter and Low-Frequency Gravitational Wave Detection
with Gaia-like Astrometry | 14 pages, 2 figures | null | null | DESY-24-106 | hep-ph astro-ph.CO astro-ph.GA astro-ph.IM gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Astrometric surveys offer us a method to search for elusive cosmic
signatures, such as ultralight dark photon dark matter and gravitational waves,
by observing the deflection to the apparent positions of the stars. The
detection capabilities of such surveys rapidly decrease at low frequencies,
because the signals become hardly distinguishable from the background motion of
stars. In this work, we find that the background motion can be well described
by a linear model over time, based on which we propose a linear background
subtraction scheme. Compared to the conventional quadratic subtraction, the
advantage of linear subtraction emerges within the frequency range below $6
\times 10^{-9}~{\rm Hz}$. Taking dark photons with purely gravitational
interactions, dark photons with additional $U(1)_{B}$ or $U(1)_{B-L}$ gauge
interactions, and low-frequency gravitational waves as examples, we illustrate
that the linear subtraction scheme can result in an enhancement of more than
one order of magnitude in the exclusion limits of Gaia-like experiments in the
low-frequency range.
| [
{
"created": "Tue, 23 Jul 2024 14:04:12 GMT",
"version": "v1"
}
] | 2024-07-24 | [
[
"An",
"Haipeng",
""
],
[
"Li",
"Tingyu",
""
],
[
"Shu",
"Jing",
""
],
[
"Wang",
"Xin",
""
],
[
"Xue",
"Xiao",
""
],
[
"Zhao",
"Yue",
""
]
] | Astrometric surveys offer us a method to search for elusive cosmic signatures, such as ultralight dark photon dark matter and gravitational waves, by observing the deflection to the apparent positions of the stars. The detection capabilities of such surveys rapidly decrease at low frequencies, because the signals become hardly distinguishable from the background motion of stars. In this work, we find that the background motion can be well described by a linear model over time, based on which we propose a linear background subtraction scheme. Compared to the conventional quadratic subtraction, the advantage of linear subtraction emerges within the frequency range below $6 \times 10^{-9}~{\rm Hz}$. Taking dark photons with purely gravitational interactions, dark photons with additional $U(1)_{B}$ or $U(1)_{B-L}$ gauge interactions, and low-frequency gravitational waves as examples, we illustrate that the linear subtraction scheme can result in an enhancement of more than one order of magnitude in the exclusion limits of Gaia-like experiments in the low-frequency range. |
2101.01405 | Xiao-Dong Ma | Xiao-Gang He and Xiao-Dong Ma | $\Delta B=2$ neutron decay into antiproton mode $n\to \bar
pe^+\nu(\bar\nu)$ | 6 pages, references updated, expanded discussion, version to appear
in PLB | Physics Letters B 817 (2021) 136298 | 10.1016/j.physletb.2021.136298 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We discuss the unique baryon number violation by two units neutron decay mode
$n\to \bar p e^+\chi$, with $\chi$ being the standard model (SM) neutrino $\nu$
or antineutrino $\bar\nu$ or any beyond SM light fermion, in the framework of
effective field theory. This mode is kinematically allowed but rarely discussed
theoretically or searched for experimentally. We estimate the lower bound on
its partial lifetime from that of the dinucleon decay $np\to e^+\chi$ per
oxygen nucleus $^{16}$O set by the Super-Kamiokande experiment, with a
conservative bound $\Gamma^{-1}_{n\to\bar pe^+\chi}>5.7\times 10^{39}~\rm yrs$.
We also discuss its characteristic signature for the future experimental search
and astrophysical implications.
| [
{
"created": "Tue, 5 Jan 2021 08:25:24 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Apr 2021 15:53:47 GMT",
"version": "v2"
}
] | 2021-04-22 | [
[
"He",
"Xiao-Gang",
""
],
[
"Ma",
"Xiao-Dong",
""
]
] | We discuss the unique baryon number violation by two units neutron decay mode $n\to \bar p e^+\chi$, with $\chi$ being the standard model (SM) neutrino $\nu$ or antineutrino $\bar\nu$ or any beyond SM light fermion, in the framework of effective field theory. This mode is kinematically allowed but rarely discussed theoretically or searched for experimentally. We estimate the lower bound on its partial lifetime from that of the dinucleon decay $np\to e^+\chi$ per oxygen nucleus $^{16}$O set by the Super-Kamiokande experiment, with a conservative bound $\Gamma^{-1}_{n\to\bar pe^+\chi}>5.7\times 10^{39}~\rm yrs$. We also discuss its characteristic signature for the future experimental search and astrophysical implications. |
0710.4954 | Mary Hall Reno | M. H. Reno (Iowa), I. Sarcevic (Arizona) and J. Uscinski (Arizona) | Cosmogenic neutrinos and quasi-stable supersymmetric particle production | 11 pages, 18 figures; minor changes in the conclusion, version to be
published in Phys. Rev. D | Phys.Rev.D76:125030,2007 | 10.1103/PhysRevD.76.125030 | null | hep-ph astro-ph | null | We study the signal for the detection of quasi-stable supersymmetric
particles produced in interactions of cosmogenic neutrinos. We consider energy
loss of high energy staus due to photonuclear and weak interactions. We show
that there are optimal nadir angles for which the stau signal is a factor of
several hundred larager than muons. We discuss how one could potentially
eliminate the muon background by considering the energy loss of muons in the
detector. We also show results for the showers produced by weak interactions of
staus that reach the detector.
| [
{
"created": "Thu, 25 Oct 2007 20:26:02 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Nov 2007 21:24:27 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Reno",
"M. H.",
"",
"Iowa"
],
[
"Sarcevic",
"I.",
"",
"Arizona"
],
[
"Uscinski",
"J.",
"",
"Arizona"
]
] | We study the signal for the detection of quasi-stable supersymmetric particles produced in interactions of cosmogenic neutrinos. We consider energy loss of high energy staus due to photonuclear and weak interactions. We show that there are optimal nadir angles for which the stau signal is a factor of several hundred larager than muons. We discuss how one could potentially eliminate the muon background by considering the energy loss of muons in the detector. We also show results for the showers produced by weak interactions of staus that reach the detector. |
1607.02048 | C. A. Dominguez | C. A. Dominguez, L. A. Hernandez, K. Schilcher, and H. Spiesberger | Tests of quark-hadron duality in tau-decays | Invited talk at the Workshop on Determination of the Fundamental
Parameters in QCD. Mainz Institute of Theoretical Physics, Johannes Gutenberg
University of Mainz | null | 10.1142/S0217732316300366 | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An exhaustive number of QCD finite energy sum rules for $\tau$-decay together
with the latest updated ALEPH data is used to test the assumption of global
duality. Typical checks are the absence of the dimension $d=2$ condensate, the
equality of the gluon condensate extracted from vector or axial vector spectral
functions, the Weinberg sum rules, the chiral condensates of dimensions $d=6$
and $d=8$, as well as the extraction of some low-energy parameters of chiral
perturbation theory. Suitable pinched linear integration kernels are introduced
in the sum rules in order to suppress potential quark-hadron duality violations
and experimental errors. We find no compelling indications of duality
violations in hadronic $\tau$-decay in the kinematic region above $s\simeq2.2$
GeV$^{2}$ for these kernels.
| [
{
"created": "Thu, 7 Jul 2016 15:38:28 GMT",
"version": "v1"
}
] | 2016-10-12 | [
[
"Dominguez",
"C. A.",
""
],
[
"Hernandez",
"L. A.",
""
],
[
"Schilcher",
"K.",
""
],
[
"Spiesberger",
"H.",
""
]
] | An exhaustive number of QCD finite energy sum rules for $\tau$-decay together with the latest updated ALEPH data is used to test the assumption of global duality. Typical checks are the absence of the dimension $d=2$ condensate, the equality of the gluon condensate extracted from vector or axial vector spectral functions, the Weinberg sum rules, the chiral condensates of dimensions $d=6$ and $d=8$, as well as the extraction of some low-energy parameters of chiral perturbation theory. Suitable pinched linear integration kernels are introduced in the sum rules in order to suppress potential quark-hadron duality violations and experimental errors. We find no compelling indications of duality violations in hadronic $\tau$-decay in the kinematic region above $s\simeq2.2$ GeV$^{2}$ for these kernels. |
hep-ph/0604080 | Probhas Raychaudhri | Koushik Ghosh and Probhas Raychaudhuri | Time Variations of the Solar Neutrino Flux Data from Sage and Gallex-Gno
Detectors by Simple Denoising Algorithm Using Wavelet Transform | 10 pages including 6 figures | null | null | null | hep-ph | null | We have used Simple Denoising Algorithm using Wavelet Transform on the
monthly solar neutrino flux data from (1) SAGE detector during the period from
1st January 1990 to 31st December 2000; (2) SAGE detector during the period
from April 1998 to December 2001; (3) GALLEX detector during the period from
May 1991 to January 1997; (4) GNO detector during the period from May 1998 to
December 2001; (5) GALLEX-GNO detector (combined data) from May 1991 to
December 2001 and (6) average of the data from GNO and SAGE detectors during
the period from May 1998 to December 2001. (1) exhibits periodicity around 20,
27, 36, 70, 90 and 114 months. (2) shows periodicity around 21, 28, 31 and 33
months. For (3) we observe periodicity around 24, 40, 54, 57, 59, 62 and 64
months. For (4) periodicity is seen around 23, 30 and 34 months. (5) gives
periodicity around 49, 57, 64, 74, 79, 88, 95 and 99 months while (6) shows
periodicity around 24, 32, 35 and 38 months. We have found almost similar
periods in the solar flares, sunspot data, solar proton data which indicates
that the solar activity cycle may be due to the variable character of nuclear
energy generation inside the sun.
| [
{
"created": "Mon, 10 Apr 2006 11:23:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ghosh",
"Koushik",
""
],
[
"Raychaudhuri",
"Probhas",
""
]
] | We have used Simple Denoising Algorithm using Wavelet Transform on the monthly solar neutrino flux data from (1) SAGE detector during the period from 1st January 1990 to 31st December 2000; (2) SAGE detector during the period from April 1998 to December 2001; (3) GALLEX detector during the period from May 1991 to January 1997; (4) GNO detector during the period from May 1998 to December 2001; (5) GALLEX-GNO detector (combined data) from May 1991 to December 2001 and (6) average of the data from GNO and SAGE detectors during the period from May 1998 to December 2001. (1) exhibits periodicity around 20, 27, 36, 70, 90 and 114 months. (2) shows periodicity around 21, 28, 31 and 33 months. For (3) we observe periodicity around 24, 40, 54, 57, 59, 62 and 64 months. For (4) periodicity is seen around 23, 30 and 34 months. (5) gives periodicity around 49, 57, 64, 74, 79, 88, 95 and 99 months while (6) shows periodicity around 24, 32, 35 and 38 months. We have found almost similar periods in the solar flares, sunspot data, solar proton data which indicates that the solar activity cycle may be due to the variable character of nuclear energy generation inside the sun. |
1210.5708 | Yi Liao | Yi Liao (Nankai U.) | Multi-photon Decays of the Higgs Boson in Standard Model: Leading Terms
from Heisenberg-Euler Effective Lagrangian | 8 pages, no figures or tables | null | 10.1103/PhysRevD.86.117302 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the multi-photon decay widths of the Higgs boson from an
effective Lagrangian for a system of electromagnetic and Higgs fields. We
utilize a low-energy theorem to connect the above Lagrangian to the
Heisenberg-Euler effective Lagrangian induced by charged particles that gain
mass from interactions with the Higgs boson. In the standard model only the
W^\pm gauge bosons and the top quark are relevant, and we compute their
contributions to the effective couplings and the multi-photon decay widths of
the Higgs boson.
| [
{
"created": "Sun, 21 Oct 2012 09:36:20 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Liao",
"Yi",
"",
"Nankai U."
]
] | We calculate the multi-photon decay widths of the Higgs boson from an effective Lagrangian for a system of electromagnetic and Higgs fields. We utilize a low-energy theorem to connect the above Lagrangian to the Heisenberg-Euler effective Lagrangian induced by charged particles that gain mass from interactions with the Higgs boson. In the standard model only the W^\pm gauge bosons and the top quark are relevant, and we compute their contributions to the effective couplings and the multi-photon decay widths of the Higgs boson. |
hep-ph/0406066 | Omar Gustavo Miranda | O. G. Miranda, T. I. Rashba, A. I. Rez, J. W. F. Valle | Enhanced solar anti-neutrino flux in random magnetic fields | 25 pages, 5 figures; final version to appear in Phys. Rev. D | Phys.Rev.D70:113002,2004 | 10.1103/PhysRevD.70.113002 | IFIC/04-30 | hep-ph astro-ph | null | We discuss the impact of the recent KamLAND constraint on the solar
anti-neutrino flux on the analysis of solar neutrino data in the presence of
Majorana neutrino transition magnetic moments and solar magnetic fields. We
consider different stationary solar magnetic field models, both regular and
random, highlighting the strong enhancement in the anti-neutrino production
rates that characterize turbulent solar magnetic field models. Moreover, we
show that for such magnetic fields inside the Sun, one can constrain the
intrinsic neutrino magnetic moment down to the level of mu_nu lessthan few
times 10^-12 x mu_B irrespective of details of the underlying turbulence model.
This limit is more stringent than all current experimental sensitivities, and
similar to the most stringent bounds obtained from stellar cooling. We also
comment on the robustness of this limit and show that at most it might be
weakened by one order of magnitude, under very unlikely circumstances.
| [
{
"created": "Mon, 7 Jun 2004 19:30:21 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Oct 2004 00:10:04 GMT",
"version": "v2"
}
] | 2009-09-17 | [
[
"Miranda",
"O. G.",
""
],
[
"Rashba",
"T. I.",
""
],
[
"Rez",
"A. I.",
""
],
[
"Valle",
"J. W. F.",
""
]
] | We discuss the impact of the recent KamLAND constraint on the solar anti-neutrino flux on the analysis of solar neutrino data in the presence of Majorana neutrino transition magnetic moments and solar magnetic fields. We consider different stationary solar magnetic field models, both regular and random, highlighting the strong enhancement in the anti-neutrino production rates that characterize turbulent solar magnetic field models. Moreover, we show that for such magnetic fields inside the Sun, one can constrain the intrinsic neutrino magnetic moment down to the level of mu_nu lessthan few times 10^-12 x mu_B irrespective of details of the underlying turbulence model. This limit is more stringent than all current experimental sensitivities, and similar to the most stringent bounds obtained from stellar cooling. We also comment on the robustness of this limit and show that at most it might be weakened by one order of magnitude, under very unlikely circumstances. |
1308.1447 | Marian Kupczynski | Marian Kupczynski | Possible violation of the optical theorem in LHC experiments | Shortened and improved, 10 pages, several typos corrected, invited
talk at QTAP conference 2013 in Vaxjo Sweden to be published in Physica
Scripta, not included sections of the first version, will be extended and
published as a separate paper | M.Kupczynski,Phys. Scr. T163 (2014) 014021 (6pp) | 10.1088/0031-8949/2014/T163/014021 | null | hep-ph nucl-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The optical theorem allowing the determination of the total cross section for
a hadron-hadron scattering from the imaginary part of the forward elastic
scattering amplitude is believed to be an unavoidable consequence of the
conservation of probability and of the unitary S matrix. This is a fundamental
theorem which contains not directly measurable imaginary part of the forward
elastic scattering amplitude. The impossibility of scattering phenomena without
the elastic channel is considered to be a part of the quantum magic. However if
one takes seriously the idea that the hadrons are extended particles one may
define a unitary S matrix such that one cannot prove the optical theorem.
Moreover data violating the optical theorem do exist but they are not
conclusive due to the uncertainties related to the extrapolation of the
differential elastic cross-section to the forward direction. These results were
published several years ago but they were forgotten. In this paper we will
recall these results in an understandable way and we will give the additional
arguments why the optical theorem can be violated in high energy strong
interaction scattering and why it should be tested and not simply used as a
tool in LHC experiments.
| [
{
"created": "Tue, 6 Aug 2013 23:59:53 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Dec 2013 18:20:42 GMT",
"version": "v2"
}
] | 2015-01-08 | [
[
"Kupczynski",
"Marian",
""
]
] | The optical theorem allowing the determination of the total cross section for a hadron-hadron scattering from the imaginary part of the forward elastic scattering amplitude is believed to be an unavoidable consequence of the conservation of probability and of the unitary S matrix. This is a fundamental theorem which contains not directly measurable imaginary part of the forward elastic scattering amplitude. The impossibility of scattering phenomena without the elastic channel is considered to be a part of the quantum magic. However if one takes seriously the idea that the hadrons are extended particles one may define a unitary S matrix such that one cannot prove the optical theorem. Moreover data violating the optical theorem do exist but they are not conclusive due to the uncertainties related to the extrapolation of the differential elastic cross-section to the forward direction. These results were published several years ago but they were forgotten. In this paper we will recall these results in an understandable way and we will give the additional arguments why the optical theorem can be violated in high energy strong interaction scattering and why it should be tested and not simply used as a tool in LHC experiments. |
1210.4674 | Vsevolod Orlovsky | A. M. Badalian, V. D. Orlovsky and Yu. A. Simonov | Microscopic study of the string breaking in QCD | 21 pages, 8 figures, typos corrected, to be published in
Phys.Atom.Nucl | Phys.Atom.Nucl. 76 (2013) 955-964 | 10.1134/S1063778813080048 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Theory of strong decays defines in addition to decay widths, also the channel
coupling and the mass shifts of the levels above the decay thresholds. In the
standard decay models of the 3P0 type the decay vertex is taken to be a
phenomenological constant "gamma" and such a choice leads to large mass shifts
of all meson levels due to real and virtual decays, the latter giving a
divergent contribution. Here we show that taking the microscopic details of
decay vertex into account, one obtains new string width coefficient, which
strongly suppresses virtual decay contribution. In addition for a realistic
space structure of the decay vertex of highly excited states, the decay matrix
elements appear to be strongly different from those, where the constant "gamma"
is used. From our analysis also follows that so-called flattening potential can
imitate the effects of intermediate decay channels.
| [
{
"created": "Wed, 17 Oct 2012 09:03:54 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Dec 2012 18:16:05 GMT",
"version": "v2"
}
] | 2014-01-21 | [
[
"Badalian",
"A. M.",
""
],
[
"Orlovsky",
"V. D.",
""
],
[
"Simonov",
"Yu. A.",
""
]
] | Theory of strong decays defines in addition to decay widths, also the channel coupling and the mass shifts of the levels above the decay thresholds. In the standard decay models of the 3P0 type the decay vertex is taken to be a phenomenological constant "gamma" and such a choice leads to large mass shifts of all meson levels due to real and virtual decays, the latter giving a divergent contribution. Here we show that taking the microscopic details of decay vertex into account, one obtains new string width coefficient, which strongly suppresses virtual decay contribution. In addition for a realistic space structure of the decay vertex of highly excited states, the decay matrix elements appear to be strongly different from those, where the constant "gamma" is used. From our analysis also follows that so-called flattening potential can imitate the effects of intermediate decay channels. |
hep-ph/0311137 | Pavel Baikov | P. A. Baikov (Moscow State Univ.), K. G. Chetyrkin and J. H. Kuehn
(Karlsruhe Univ.) | QCD Corrections to Hadronic Z and tau Decays | revised version (some references corrected); 3 pages, talk given at
International Europhysics Conference on High Energy Physics, Aachen, Germany,
17-23 July 2003 | Eur.Phys.J.C33:s650-s652,2004 | 10.1140/epjcd/s2004-03-1839-8 | TTP03-35 | hep-ph | null | We present a brief (mainly bibliographical) report on recently performed
calculations of terms of order O(\alpha_s^4 n_f^2) and O(\alpha_s^4 n_f^2
m_q^2) for hadronic Z and \tau decay rates. A few details about the analytical
evaluation of the masters integrals appearing in the course of calculations are
presented.
| [
{
"created": "Tue, 11 Nov 2003 10:51:52 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Nov 2003 14:00:23 GMT",
"version": "v2"
}
] | 2009-03-16 | [
[
"Baikov",
"P. A.",
"",
"Moscow State Univ."
],
[
"Chetyrkin",
"K. G.",
"",
"Karlsruhe Univ."
],
[
"Kuehn",
"J. H.",
"",
"Karlsruhe Univ."
]
] | We present a brief (mainly bibliographical) report on recently performed calculations of terms of order O(\alpha_s^4 n_f^2) and O(\alpha_s^4 n_f^2 m_q^2) for hadronic Z and \tau decay rates. A few details about the analytical evaluation of the masters integrals appearing in the course of calculations are presented. |
1510.08288 | Thomas Hilger | Thomas Hilger | Poincare covariant pseudoscalar and scalar meson spectroscopy in
Wigner-Weyl phase | 11 pages, 21 figures; revised, accepted for publication in
Phys.Rev.D; complemented by inflection point, analytic structure and chiral
condensate investigation | Phys. Rev. D 93, 054020 (2016) | 10.1103/PhysRevD.93.054020 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The coupled quark Dyson-Schwinger and meson Bethe-Salpeter equations in
rainbow-ladder truncation for spin-0 mesons are solved in Wigner-Weyl phase in
the chiral limit and beyond, retaining only the ultraviolet finite terms of the
phenomenologically most successful Maris-Tandy interaction. This allows to
reveal and discuss the scalar and pseudoscalar meson masses in a chirally
symmetric setting without additional medium effects. Independent of the
current-quark mass, the found solutions are spacelike, i.\,e.\ have negative
squared masses. The current-quark mass dependence of meson masses, leptonic
decay constants and chiral condensate are illustrated in Wigner-Weyl phase.
| [
{
"created": "Wed, 28 Oct 2015 12:43:03 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Feb 2016 20:39:02 GMT",
"version": "v2"
}
] | 2016-03-30 | [
[
"Hilger",
"Thomas",
""
]
] | The coupled quark Dyson-Schwinger and meson Bethe-Salpeter equations in rainbow-ladder truncation for spin-0 mesons are solved in Wigner-Weyl phase in the chiral limit and beyond, retaining only the ultraviolet finite terms of the phenomenologically most successful Maris-Tandy interaction. This allows to reveal and discuss the scalar and pseudoscalar meson masses in a chirally symmetric setting without additional medium effects. Independent of the current-quark mass, the found solutions are spacelike, i.\,e.\ have negative squared masses. The current-quark mass dependence of meson masses, leptonic decay constants and chiral condensate are illustrated in Wigner-Weyl phase. |
hep-ph/0402230 | Zhi-Hai Lin | S. Dulat, K. Hagiwara, and Z.-H. Lin | Scalar charmonium and glueball mixing in $e^+ e^-\to J/\psi X$ | 10 pages, 4 figures,references updated,typos corrected. Published
Version: Phys. Lett. B 594, 118-126 (2004) | Phys.Lett.B594:118-126,2004 | 10.1016/j.physletb.2004.05.027 | KEK-TH-943 | hep-ph | null | We study the possibility of the scalar charmonium and glueball mixing in $e^+
e^-$ annihilation at $\sqrt{s}=10.6$ GeV. The effects can be used to explain
the unexpected large cross section ($12\pm 4$ fb) and the anomalous angular
distribution ($\alpha= -1.1^{+0.8}_{-0.6}$) of the exclusive $e^+e^-\to
J/\psi\chi_{c0}$ process observed by Belle experiments at KEKB. We calculate
the helicity amplitudes for the process $e^+ e^- \to J/\psi H(0^{++})$ in
NRQCD, where $H(0^{++})$ is the mixed state. We present a detailed analysis on
the total cross section and various angular asymmetries which could be useful
to reveal the existence of the scalar glueball state.
| [
{
"created": "Mon, 23 Feb 2004 10:25:09 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Aug 2004 08:32:09 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Dulat",
"S.",
""
],
[
"Hagiwara",
"K.",
""
],
[
"Lin",
"Z. -H.",
""
]
] | We study the possibility of the scalar charmonium and glueball mixing in $e^+ e^-$ annihilation at $\sqrt{s}=10.6$ GeV. The effects can be used to explain the unexpected large cross section ($12\pm 4$ fb) and the anomalous angular distribution ($\alpha= -1.1^{+0.8}_{-0.6}$) of the exclusive $e^+e^-\to J/\psi\chi_{c0}$ process observed by Belle experiments at KEKB. We calculate the helicity amplitudes for the process $e^+ e^- \to J/\psi H(0^{++})$ in NRQCD, where $H(0^{++})$ is the mixed state. We present a detailed analysis on the total cross section and various angular asymmetries which could be useful to reveal the existence of the scalar glueball state. |
hep-ph/9809516 | E. Petitgirard | E. Petitgirard | Infrared and light-cone limit in hot QED | 7 pages, RevTeX, 2 eps figures. Contribution to the proceedings of
the 5th International Workshop on Thermal Field Theories and their
Applications, Regensburg (Germany), August 1998. Typos corrected | null | null | null | hep-ph | null | In hot gauge theories a breakdown of the hard thermal loop expansion occurs
for light-like external momenta or in the infrared region. In QED where a
resummation of ladder diagrams is usually advocated, it is shown that long
range magnetic interations involve a broader set of graphs. The consequence is
a generalized compensation of the hard modes damping terms at leading order in
the infrared limit and near the light-cone. The relevance of the so-called
improved hard thermal loop resummation scheme is discussed.
| [
{
"created": "Thu, 24 Sep 1998 13:12:06 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Oct 1998 13:03:02 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Petitgirard",
"E.",
""
]
] | In hot gauge theories a breakdown of the hard thermal loop expansion occurs for light-like external momenta or in the infrared region. In QED where a resummation of ladder diagrams is usually advocated, it is shown that long range magnetic interations involve a broader set of graphs. The consequence is a generalized compensation of the hard modes damping terms at leading order in the infrared limit and near the light-cone. The relevance of the so-called improved hard thermal loop resummation scheme is discussed. |
2309.03994 | Andrei Kataev | A.L.Kataev and V.S.Molokoedov | The decomposed photon anomalous dimension in QCD and the
$\{\beta\}$-expanded representations for the Adler function | The version accepted for publication in Phys.Rev.D 9 october 2023 and
published 27 November 2023 after several tours of exellent edditing by the
EDITOR of PRD and careful clarifications by the authors; content remaining
the same as in the original version, apart of number of style clarifications,
unsufficient analytical misprint is removed; conclusions remain the same | Phys. Rev. D \textbf{108} (2023) no.9, 096027 | 10.1103/PhysRevD.108.096027 | INR-TH-2023-014 | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work is devoted to the study of the $\{\beta\}$-expansion of the
perturbative expressions for the $e^+e^-$ annihilation Adler function $D(Q^2)$
and for the related renormalization group functions, namely for the photon
vacuum polarization function and its anomalous dimension $\gamma(\alpha_s)$ in
QCD at the $\mathcal{O}(\alpha^4_s)$ order. We emphasize that
$\gamma(\alpha_s)$ is not a conformal-invariant contribution to $D(Q^2)$ and,
therefore, for a consistent analysis it is necessary to decompose its
higher-order PT coefficients in powers of the $\beta$-function coefficients in
the same way as for the Adler function. The arguments in favor of this
statement are given. The comparison of the $\overline{MS}$ and PMC/BLM
approximants are demonstrated.Theoretical and phenomenologically related
consequences of this comparison are briefly commented.
| [
{
"created": "Thu, 7 Sep 2023 19:55:57 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Nov 2023 07:52:15 GMT",
"version": "v2"
}
] | 2023-12-01 | [
[
"Kataev",
"A. L.",
""
],
[
"Molokoedov",
"V. S.",
""
]
] | This work is devoted to the study of the $\{\beta\}$-expansion of the perturbative expressions for the $e^+e^-$ annihilation Adler function $D(Q^2)$ and for the related renormalization group functions, namely for the photon vacuum polarization function and its anomalous dimension $\gamma(\alpha_s)$ in QCD at the $\mathcal{O}(\alpha^4_s)$ order. We emphasize that $\gamma(\alpha_s)$ is not a conformal-invariant contribution to $D(Q^2)$ and, therefore, for a consistent analysis it is necessary to decompose its higher-order PT coefficients in powers of the $\beta$-function coefficients in the same way as for the Adler function. The arguments in favor of this statement are given. The comparison of the $\overline{MS}$ and PMC/BLM approximants are demonstrated.Theoretical and phenomenologically related consequences of this comparison are briefly commented. |
1308.1202 | Matthias Steinhauser | Chihaya Anzai, Mario Prausa, Alexander V. Smirnov, Vladimir A.
Smirnov, Matthias Steinhauser | Colour octet potential to three loops | 16 pages | null | 10.1103/PhysRevD.88.054030 | SFB/CPP-13-54, TTP13-28 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the interaction between two static sources in the colour octet
configuration and compute the potential to three loops. Special emphasis is put
on the treatment of pinch contributions and two methods are applied to reduce
their evaluation to diagrams without pinches.
| [
{
"created": "Tue, 6 Aug 2013 08:24:07 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Anzai",
"Chihaya",
""
],
[
"Prausa",
"Mario",
""
],
[
"Smirnov",
"Alexander V.",
""
],
[
"Smirnov",
"Vladimir A.",
""
],
[
"Steinhauser",
"Matthias",
""
]
] | We consider the interaction between two static sources in the colour octet configuration and compute the potential to three loops. Special emphasis is put on the treatment of pinch contributions and two methods are applied to reduce their evaluation to diagrams without pinches. |
2006.09284 | Michael Strickland | Michael Strickland | Pseudothermalization of the quark-gluon plasma | 9 pages, 4 multipanel figures | null | 10.1088/1742-6596/1602/1/012018 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this proceedings contribution I review recent work in kinetic theory which
demonstrates that, for system undergoing Bjorken expansion, there exists an
attractor in all moments of the one-particle distribution function. I discuss
how this attractor emerges in both exact solutions obtained in relaxation time
approximation (RTA) and the effective kinetic theory approach to
high-temperature quantum chromodynamics (QCD). The QCD effective kinetic theory
collisional kernel used includes both elastic (2 <-> 2) and LPM-resummed
inelastic (2 <-> 1) contributions. The results obtained indicate that a
pseudothermal attractor exists in both RTA and QCD kinetic theory and that
their respective attractors can be extended to early times when the system is
far from equilibrium. Finally, I discuss how knowledge of the QCD effective
kinetic theory attractor can be used to assess different hydrodynamic
freeze-out prescriptions used in heavy-ion phenomenology. The results obtained
show that improved freeze-out prescriptions such as anisotropic hydrodynamics
perform better in conditions corresponding to those generated in
high-multiplicity pA and pp collisions, e.g. short lifetime and high inverse
Reynolds number.
| [
{
"created": "Tue, 16 Jun 2020 16:25:28 GMT",
"version": "v1"
}
] | 2020-09-10 | [
[
"Strickland",
"Michael",
""
]
] | In this proceedings contribution I review recent work in kinetic theory which demonstrates that, for system undergoing Bjorken expansion, there exists an attractor in all moments of the one-particle distribution function. I discuss how this attractor emerges in both exact solutions obtained in relaxation time approximation (RTA) and the effective kinetic theory approach to high-temperature quantum chromodynamics (QCD). The QCD effective kinetic theory collisional kernel used includes both elastic (2 <-> 2) and LPM-resummed inelastic (2 <-> 1) contributions. The results obtained indicate that a pseudothermal attractor exists in both RTA and QCD kinetic theory and that their respective attractors can be extended to early times when the system is far from equilibrium. Finally, I discuss how knowledge of the QCD effective kinetic theory attractor can be used to assess different hydrodynamic freeze-out prescriptions used in heavy-ion phenomenology. The results obtained show that improved freeze-out prescriptions such as anisotropic hydrodynamics perform better in conditions corresponding to those generated in high-multiplicity pA and pp collisions, e.g. short lifetime and high inverse Reynolds number. |
2112.03672 | Chengqun Pang | Chao-hui Wang, Long Tang, Ting-yan Li, Gong-ping Zheng, Jing-fu Hu,
Cheng-qun Pang | The effective $\beta$ value in a Simple Harmonic Oscillator wave
function | 10 pages,3 figure | NPR,2022,39(02):160-171 | 10.11804/NuclPhysRev.39.2022012 | null | hep-ph quant-ph | http://creativecommons.org/licenses/by/4.0/ | When a Simple Harmonic Oscillator (SHO) wave function is used as an effective
wave function, a very important parameter in the SHO wave function is the
effective $\beta$ value. We obtain the analytical expression of $\beta_{eff}$
($\beta_{effective}$) of the SHO wave function in coordinate space and momentum
space. The expression is applied to the light meson system
$(u\bar{u},~u\bar{s})$ to compare the behavior of $\beta_{eff}$. The results
show that $\beta_ {eff,\mathbf{r}}$ in coordinate space and $\beta_
{eff,\mathbf{p}}$ in momentum space are significantly different in the ground
state, however, similar in the highly excited states with Cornell potential.
| [
{
"created": "Mon, 6 Dec 2021 17:01:59 GMT",
"version": "v1"
},
{
"created": "Sat, 21 May 2022 17:01:31 GMT",
"version": "v2"
},
{
"created": "Wed, 13 Jul 2022 09:06:39 GMT",
"version": "v3"
}
] | 2022-10-10 | [
[
"Wang",
"Chao-hui",
""
],
[
"Tang",
"Long",
""
],
[
"Li",
"Ting-yan",
""
],
[
"Zheng",
"Gong-ping",
""
],
[
"Hu",
"Jing-fu",
""
],
[
"Pang",
"Cheng-qun",
""
]
] | When a Simple Harmonic Oscillator (SHO) wave function is used as an effective wave function, a very important parameter in the SHO wave function is the effective $\beta$ value. We obtain the analytical expression of $\beta_{eff}$ ($\beta_{effective}$) of the SHO wave function in coordinate space and momentum space. The expression is applied to the light meson system $(u\bar{u},~u\bar{s})$ to compare the behavior of $\beta_{eff}$. The results show that $\beta_ {eff,\mathbf{r}}$ in coordinate space and $\beta_ {eff,\mathbf{p}}$ in momentum space are significantly different in the ground state, however, similar in the highly excited states with Cornell potential. |
hep-ph/0306156 | Stefano Forte | Guido Altarelli, Richard D.Ball and Stefano Forte | An anomalous dimension for small x evolution | 25 pages, 8 figures, plain TeX with harvmac; minor errors in the text
corrected | Nucl.Phys.B674:459-483,2003 | 10.1016/j.nuclphysb.2003.09.040 | CERN-TH/2003-019, Edinburgh 2003/08, IFUM-745/FT | hep-ph | null | We construct an anomalous dimension for small x evolution which goes beyond
standard fixed order perturbative evolution by including resummed small x
logarithms deduced from the leading order BFKL equation with running coupling.
Surprisingly, we find that once running coupling effects are properly taken
into account, the leading approximation is very close to standard perturbative
evolution in the range of x accessible at HERA, in overall agreement with the
data, with no need for phenomenological parameters to summarise subleading
effects. We also show that further corrections due to subleading small x
logarithms derived from the Fadin-Lipatov kernel can be kept under control, but
that they involve substantial resummation ambiguities which limit their
practical usefulness.
| [
{
"created": "Tue, 17 Jun 2003 15:40:33 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Jul 2003 14:38:31 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Altarelli",
"Guido",
""
],
[
"Ball",
"Richard D.",
""
],
[
"Forte",
"Stefano",
""
]
] | We construct an anomalous dimension for small x evolution which goes beyond standard fixed order perturbative evolution by including resummed small x logarithms deduced from the leading order BFKL equation with running coupling. Surprisingly, we find that once running coupling effects are properly taken into account, the leading approximation is very close to standard perturbative evolution in the range of x accessible at HERA, in overall agreement with the data, with no need for phenomenological parameters to summarise subleading effects. We also show that further corrections due to subleading small x logarithms derived from the Fadin-Lipatov kernel can be kept under control, but that they involve substantial resummation ambiguities which limit their practical usefulness. |
hep-ph/9608238 | Jean-Marc Virey | P. Chiappetta | Theoretical overview on Diboson production | 8 pages, latex and 3 ps figures. Invited talk given at XIth Topical
Workshop on Proton Antiproton Collider Physics, 26 May- 1 June 1996,
Abano-Terme (Italy) | null | null | CPT-96/P.3365 | hep-ph | null | Precise measurements of weak vector bosons self couplings give a hint on the
electroweak symmetry breaking sector. We first stress that present data from
LEP and TEVATRON clearly indicate that weak bosons are self interacting. We
then review the limits on the trilinear and quadrilinear couplings expected at
LEP2, $e^+e^-$ linear colliders and LHC.
| [
{
"created": "Tue, 6 Aug 1996 12:11:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chiappetta",
"P.",
""
]
] | Precise measurements of weak vector bosons self couplings give a hint on the electroweak symmetry breaking sector. We first stress that present data from LEP and TEVATRON clearly indicate that weak bosons are self interacting. We then review the limits on the trilinear and quadrilinear couplings expected at LEP2, $e^+e^-$ linear colliders and LHC. |
1603.09663 | Pablo Roig | Andrea Lami and Pablo Roig | $H\to \ell\ell'$ in the Simplest Little Higgs Model | 12 pages, 10 figures. v2: Impact of low-energy restrictions revised
with two figures added. Minor rewriting and references updated. v3: Three
heavy neutrino scenario included. Version accepted by PRD | Phys. Rev. D 94, 056001 (2016) | 10.1103/PhysRevD.94.056001 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Little Higgs Models are promising constructs to solve the hierarchy problem
affecting the Higgs boson mass for generic new physics. However, their
preservation of lepton universality forbids them to account for the
$H\to\tau\mu$ CMS hint and at the same time respect (as they do) the severe
limits on $H\to\mu e$ inherited from the non-observation of $\mu\to e\gamma$.
We compute the predictions of the Simplest Little Higgs Model for the $H\to
\ell\ell'$ decays and conclude that the measurement of any of these decays at
LHC (even with a much smaller rate than currently hinted) would, under
reasonable assumptions, disfavor this model. This result is consistent with our
earlier observation of very suppressed lepton flavor violating semileptonic tau
decays within this model.
| [
{
"created": "Thu, 31 Mar 2016 16:21:59 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jun 2016 22:06:16 GMT",
"version": "v2"
},
{
"created": "Mon, 22 Aug 2016 19:49:39 GMT",
"version": "v3"
}
] | 2016-09-08 | [
[
"Lami",
"Andrea",
""
],
[
"Roig",
"Pablo",
""
]
] | Little Higgs Models are promising constructs to solve the hierarchy problem affecting the Higgs boson mass for generic new physics. However, their preservation of lepton universality forbids them to account for the $H\to\tau\mu$ CMS hint and at the same time respect (as they do) the severe limits on $H\to\mu e$ inherited from the non-observation of $\mu\to e\gamma$. We compute the predictions of the Simplest Little Higgs Model for the $H\to \ell\ell'$ decays and conclude that the measurement of any of these decays at LHC (even with a much smaller rate than currently hinted) would, under reasonable assumptions, disfavor this model. This result is consistent with our earlier observation of very suppressed lepton flavor violating semileptonic tau decays within this model. |
1608.02061 | Javier Andr\'es Orduz Ducuara Dr. | J. A. Orduz-Ducuara | Exclusions on $Z'$ mass and its non-universal couplings in LFV decays | Version two I added references, a new plot and corrected typos.
Results unchanged. 7 pages, 10 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This letter presents a phenomenological analysis for the lepton ($l_i^{}$)
decaying into $ l_j^{} l_k^{} \bar{l}_k^{}, l_j^{} \pi^+ \pi^-$ considering
family non-universal couplings as source of the lepton flavor-violating (LFV)
currents and a new neutral gauge boson ($Z'$) as mediator in the
flavor-changing. The most viable $g_{V}^{f_if_J}$ and $g_{A}^{f_if_j}$
couplings are reported as long as derive new bounds for the $M_{Z'}^{}$ by
using current results from LHC and a phenomenological analysis.
| [
{
"created": "Sat, 6 Aug 2016 03:43:34 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Jan 2017 23:15:39 GMT",
"version": "v2"
}
] | 2017-01-12 | [
[
"Orduz-Ducuara",
"J. A.",
""
]
] | This letter presents a phenomenological analysis for the lepton ($l_i^{}$) decaying into $ l_j^{} l_k^{} \bar{l}_k^{}, l_j^{} \pi^+ \pi^-$ considering family non-universal couplings as source of the lepton flavor-violating (LFV) currents and a new neutral gauge boson ($Z'$) as mediator in the flavor-changing. The most viable $g_{V}^{f_if_J}$ and $g_{A}^{f_if_j}$ couplings are reported as long as derive new bounds for the $M_{Z'}^{}$ by using current results from LHC and a phenomenological analysis. |
hep-ph/9701288 | Konstantin Klimenko | K.G. Klimenko, A.S. Vshivtsev (IHEP, Protvino, Russia) | New phase structure of the Nambu -- Jona - Lasinio model at nonzero
chemical potential | 8 pages, LaTeX, no figures. | JETP Lett. 64 (1996) 338-344; Pisma Zh.Eksp.Teor.Fiz. 64 (1996)
313-318 | 10.1134/1.567200 | null | hep-ph | null | It is shown that in the Nambu -- Jona - Lasinio model at nonzero chemical
potential there are two different massive phases with spontaneously broken
chiral symmetry. In one of them particle density is identically zero, in
another phase it is not equal to zero. The transition between phases is a phase
transition of the second order.
| [
{
"created": "Tue, 14 Jan 1997 16:51:57 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Klimenko",
"K. G.",
"",
"IHEP, Protvino, Russia"
],
[
"Vshivtsev",
"A. S.",
"",
"IHEP, Protvino, Russia"
]
] | It is shown that in the Nambu -- Jona - Lasinio model at nonzero chemical potential there are two different massive phases with spontaneously broken chiral symmetry. In one of them particle density is identically zero, in another phase it is not equal to zero. The transition between phases is a phase transition of the second order. |
1005.3146 | Andrea Donini | J. Bernabeu, M. Blennow, P. Coloma, A. Donini, C. Espinoza, E.
Fernandez-Martinez, P. Hernandez, P. Huber, J. Kopp, A. Longhin, J.
Lopez-Pavon, M. Mezzetto, T. Ota, T. Schwetz and W. Winter | EURONU WP6 2009 yearly report: Update of the physics potential of
Nufact, superbeams and betabeams | 2009 Yearly report of the Working Package 6 (Physics) of the EUROnu
FP7 EU project. 55 pages, 21 figures. | null | null | EURONU-WP6-10-19 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Many studies in the last ten years have shown that we can measure the unknown
angle theta13, discover leptonic CP violation and determine the neutrino
hierarchy in more precise neutrino oscillation experiments, searching for the
subleading channel nue -> numu in the atmospheric range. In this first report
of WP6 activities the following new results are reviewed: (1) Re-evaluation of
the physics reach of the upcoming generation of experiments to measure theta13
and delta; (2) New tools to explore a larger parameter space as needed beyond
the standard scenario; (3) Neutrino Factory: (a) evaluation of the physics
reach of a Nufact regards sterile neutrinos; (b) evaluation of the physics
reach of a Nufact as regards non-standard interactions; (c) evaluation of the
physics reach of a Nufact as regards violation of unitarity; (d) critical
assessment on long baseline tau-detection at Nufact; (e) new physics searches
at a near detector in a Nufact; (4) Beta-beams: (a) choice of ions and location
for a gamma = 100 CERN-based beta-beam; (b) re-evaluation of atmospheric
neutrino background for the gamma = 100 beta-beam scenario; (c) study of a two
baseline beta-beam; (d) measuring absolute neutrino mass with beta-beams; (e)
progress on monochromatic beta-beams; (5) Update of the physics potential of
the SPL super-beam. Eventually, we present an updated comparison of the
sensitivity to theta13, delta and the neutrino mass hierarchy of several of the
different proposed facilities.
| [
{
"created": "Tue, 18 May 2010 10:25:38 GMT",
"version": "v1"
}
] | 2010-05-19 | [
[
"Bernabeu",
"J.",
""
],
[
"Blennow",
"M.",
""
],
[
"Coloma",
"P.",
""
],
[
"Donini",
"A.",
""
],
[
"Espinoza",
"C.",
""
],
[
"Fernandez-Martinez",
"E.",
""
],
[
"Hernandez",
"P.",
""
],
[
"Huber",
... | Many studies in the last ten years have shown that we can measure the unknown angle theta13, discover leptonic CP violation and determine the neutrino hierarchy in more precise neutrino oscillation experiments, searching for the subleading channel nue -> numu in the atmospheric range. In this first report of WP6 activities the following new results are reviewed: (1) Re-evaluation of the physics reach of the upcoming generation of experiments to measure theta13 and delta; (2) New tools to explore a larger parameter space as needed beyond the standard scenario; (3) Neutrino Factory: (a) evaluation of the physics reach of a Nufact regards sterile neutrinos; (b) evaluation of the physics reach of a Nufact as regards non-standard interactions; (c) evaluation of the physics reach of a Nufact as regards violation of unitarity; (d) critical assessment on long baseline tau-detection at Nufact; (e) new physics searches at a near detector in a Nufact; (4) Beta-beams: (a) choice of ions and location for a gamma = 100 CERN-based beta-beam; (b) re-evaluation of atmospheric neutrino background for the gamma = 100 beta-beam scenario; (c) study of a two baseline beta-beam; (d) measuring absolute neutrino mass with beta-beams; (e) progress on monochromatic beta-beams; (5) Update of the physics potential of the SPL super-beam. Eventually, we present an updated comparison of the sensitivity to theta13, delta and the neutrino mass hierarchy of several of the different proposed facilities. |
1312.1455 | Xing-Gang Wu | Xing-Gang Wu and Tao Huang | Heavy and light meson wavefunctions | 15 pages, 12 figures. References updated. To be published in Chinese
Science Bulletin | Chin. Sci. Bull. 59, 3801 (2014) | 10.1007/s11434-014-0335-1 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a short review on the properties of heavy and light mesons'
light-cone wavefunctions (LCWFs), and their distribution amplitudes (DAs). The
B meson LCWFs can be treated by taking the heavy quark limit ($m_b\to\infty$)
and by using the heavy quark effective theory. Furthermore, we propose a simple
model for the B meson WFs with 3-particle Fock states' contributions, whose
behaviors are controlled by two parameters $\bar\Lambda$ and $\delta$. Using
such model, the form factors $F^{B\to\pi}_{+,0,T}$ and $F^{B\to K}_{+,0,T}$ in
large recoil region are studied up to ${\cal O}(1/m_b^2)$ within the $k_T$
factorization approach. On the other hand, we adopt Brodsky-Huang-Lepage (BHL)
prescription for constructing the WFs of the lighter pseudoscalars as $\eta_c$,
D-meson, pion, kaon, $\eta^{(\prime)}$ and etc. Such BHL-like model can be
conveniently extended to construct the LCWFs for light scalar or vector mesons.
Within such model the longitudinal distributions of those WFs are basically
determined by a parameter $B$, whose value can be determined via a global fit
of experimental data.
| [
{
"created": "Thu, 5 Dec 2013 07:32:38 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Feb 2014 05:37:25 GMT",
"version": "v2"
}
] | 2014-08-01 | [
[
"Wu",
"Xing-Gang",
""
],
[
"Huang",
"Tao",
""
]
] | We present a short review on the properties of heavy and light mesons' light-cone wavefunctions (LCWFs), and their distribution amplitudes (DAs). The B meson LCWFs can be treated by taking the heavy quark limit ($m_b\to\infty$) and by using the heavy quark effective theory. Furthermore, we propose a simple model for the B meson WFs with 3-particle Fock states' contributions, whose behaviors are controlled by two parameters $\bar\Lambda$ and $\delta$. Using such model, the form factors $F^{B\to\pi}_{+,0,T}$ and $F^{B\to K}_{+,0,T}$ in large recoil region are studied up to ${\cal O}(1/m_b^2)$ within the $k_T$ factorization approach. On the other hand, we adopt Brodsky-Huang-Lepage (BHL) prescription for constructing the WFs of the lighter pseudoscalars as $\eta_c$, D-meson, pion, kaon, $\eta^{(\prime)}$ and etc. Such BHL-like model can be conveniently extended to construct the LCWFs for light scalar or vector mesons. Within such model the longitudinal distributions of those WFs are basically determined by a parameter $B$, whose value can be determined via a global fit of experimental data. |
hep-ph/9904368 | Carl R. Schmidt | Carl R. Schmidt | Status of the BFKL Resummation Program | 6 pages, talk given at DPF '99 | null | null | MSUHEP-90416 | hep-ph | null | I discuss the calculation of the next-to-leading logarithmic (NLL)
corrections to the BFKL resummation, as well as some of the issues that arise
in this formalism at NLL. In particular I consider the large size and apparent
instability of the corrections, and I address some of the attempts to
understand and tame them.
| [
{
"created": "Fri, 16 Apr 1999 21:28:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Schmidt",
"Carl R.",
""
]
] | I discuss the calculation of the next-to-leading logarithmic (NLL) corrections to the BFKL resummation, as well as some of the issues that arise in this formalism at NLL. In particular I consider the large size and apparent instability of the corrections, and I address some of the attempts to understand and tame them. |
hep-ph/9906491 | Johannes Bluemlein | Johannes Bl\"umlein | Harmonic Sums and Mellin Transforms | Contribution to the Proceedings of the 7th International Workshop on
Deep Inelastic Scattering and QCD, DIS99, DESY-Zeuthen, April 1999; Nucl.
Phys. B (Proc. Suppl.) | Nucl.Phys.Proc.Suppl. 79 (1999) 166-168 | 10.1016/S0920-5632(99)00664-7 | null | hep-ph | null | The finite and infinite harmonic sums form the general basis for the Mellin
transforms of all individual functions $f_i(x)$ describing inclusive quantities
such as coefficient and splitting functions which emerge in massless field
theories. We discuss the mathematical structure of these quantities.
| [
{
"created": "Thu, 24 Jun 1999 21:29:01 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Blümlein",
"Johannes",
""
]
] | The finite and infinite harmonic sums form the general basis for the Mellin transforms of all individual functions $f_i(x)$ describing inclusive quantities such as coefficient and splitting functions which emerge in massless field theories. We discuss the mathematical structure of these quantities. |
1401.2913 | Marina Nielsen | Marina Nielsen and Fernando S. Navarra | Charged Exotic Charmonium States | 19 pages, 2 figures and 3 tables | null | 10.1142/S0217732314300055 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this short review we present and discuss all the experimental information
about the charged exotic charmonium states, which have been observed over the
last five years. We try to understand their properties such as masses and decay
widths with QCD sum rules. We describe this method, show the results and
compare them with the experimental data and with other theoretical approaches.
| [
{
"created": "Mon, 13 Jan 2014 16:58:41 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Nielsen",
"Marina",
""
],
[
"Navarra",
"Fernando S.",
""
]
] | In this short review we present and discuss all the experimental information about the charged exotic charmonium states, which have been observed over the last five years. We try to understand their properties such as masses and decay widths with QCD sum rules. We describe this method, show the results and compare them with the experimental data and with other theoretical approaches. |
hep-ph/9705369 | null | G. Buchalla | CP Violation in Neutral Kaon Decays | 5 pages, Latex; Invited Talk presented at the Symposium on
Flavor-Changing Neutral Currents, Santa Monica, California, February 19-21,
1997; to appear in the proceedings | null | null | SLAC-PUB-7520 | hep-ph | null | A brief review of the theoretical status of CP violation in decays of neutral
kaons is presented. We focus on three important topics: $\varepsilon$,
$\varepsilon'/\varepsilon$ and $K_L\to\pi^0\nu\bar\nu$.
| [
{
"created": "Wed, 21 May 1997 01:34:20 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Buchalla",
"G.",
""
]
] | A brief review of the theoretical status of CP violation in decays of neutral kaons is presented. We focus on three important topics: $\varepsilon$, $\varepsilon'/\varepsilon$ and $K_L\to\pi^0\nu\bar\nu$. |
1205.6987 | Raoul R\"ontsch | Tom Melia, Kirill Melnikov, Raoul Rontsch, Markus Schulze, Giulia
Zanderighi | Gluon fusion contribution to W+W- + jet production | 13 pages, 4 figures, 3 tables | null | 10.1007/JHEP08(2012)115 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe the computation of the $gg \to W^+W^-g$ process that contributes
to the production of two $W$-bosons and a jet at the CERN Large Hadron Collider
(LHC). While formally of next-to-next-to-leading order (NNLO) in QCD, this
process can be evaluated separately from the bulk of NNLO QCD corrections
because it is finite and gauge-invariant. It is also enhanced by the large
gluon flux and by selection cuts employed in the Higgs boson searches in the
decay channel $ H \to W^+W^-$, as was first pointed out by Binoth {\it et al.}
in the context of $gg \to W^+W^-$ production. For cuts employed by the ATLAS
collaboration, we find that the gluon fusion contribution to $pp \to W^+W^-j$
enhances the background by about ten percent and can lead to moderate
distortions of kinematic distributions which are instrumental for the ongoing
Higgs boson searches at the LHC. We also release a public code to compute the
NLO QCD corrections to this process, in the form of an add-on to the package
{\tt MCFM}.
| [
{
"created": "Thu, 31 May 2012 13:36:05 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Melia",
"Tom",
""
],
[
"Melnikov",
"Kirill",
""
],
[
"Rontsch",
"Raoul",
""
],
[
"Schulze",
"Markus",
""
],
[
"Zanderighi",
"Giulia",
""
]
] | We describe the computation of the $gg \to W^+W^-g$ process that contributes to the production of two $W$-bosons and a jet at the CERN Large Hadron Collider (LHC). While formally of next-to-next-to-leading order (NNLO) in QCD, this process can be evaluated separately from the bulk of NNLO QCD corrections because it is finite and gauge-invariant. It is also enhanced by the large gluon flux and by selection cuts employed in the Higgs boson searches in the decay channel $ H \to W^+W^-$, as was first pointed out by Binoth {\it et al.} in the context of $gg \to W^+W^-$ production. For cuts employed by the ATLAS collaboration, we find that the gluon fusion contribution to $pp \to W^+W^-j$ enhances the background by about ten percent and can lead to moderate distortions of kinematic distributions which are instrumental for the ongoing Higgs boson searches at the LHC. We also release a public code to compute the NLO QCD corrections to this process, in the form of an add-on to the package {\tt MCFM}. |
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