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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1507.00916 | Daniel Hern\'andez | Andr\'e de Gouvea, Daniel Hernandez | New Chiral Fermions, a New Gauge Interaction, Dirac Neutrinos, and Dark
Matter | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose that all light fermionic degrees of freedom, including the
Standard Model (SM) fermions and all possible light beyond-the-standard-model
fields, are chiral with respect to some spontaneously broken abelian gauge
symmetry. Hypercharge, for example, plays this role for the SM fermions. We
introduce a new symmetry, $U(1)_{\nu}$, for all new light fermionic states.
Anomaly cancellations mandate the existence of several new fermion fields with
nontrivial $U(1)_{\nu}$ charges. We develop a concrete model of this type, for
which we show that (i) some fermions remain massless after $U(1)_{\nu}$
breaking -- similar to SM neutrinos -- and (ii) accidental global symmetries
translate into stable massive particles -- similar to SM protons. These
ingredients provide a solution to the dark matter and neutrino mass puzzles
assuming one also postulates the existence of heavy degrees of freedom that act
as "mediators" between the two sectors. The neutrino mass mechanism described
here leads to parametrically small Dirac neutrino masses, and the model also
requires the existence of at least four Dirac sterile neutrinos. Finally, we
describe a general technique to write down chiral-fermions-only models that are
at least anomaly-free under a $U(1)$ gauge symmetry.
| [
{
"created": "Fri, 3 Jul 2015 14:01:53 GMT",
"version": "v1"
}
] | 2015-07-06 | [
[
"de Gouvea",
"André",
""
],
[
"Hernandez",
"Daniel",
""
]
] | We propose that all light fermionic degrees of freedom, including the Standard Model (SM) fermions and all possible light beyond-the-standard-model fields, are chiral with respect to some spontaneously broken abelian gauge symmetry. Hypercharge, for example, plays this role for the SM fermions. We introduce a new symmetry, $U(1)_{\nu}$, for all new light fermionic states. Anomaly cancellations mandate the existence of several new fermion fields with nontrivial $U(1)_{\nu}$ charges. We develop a concrete model of this type, for which we show that (i) some fermions remain massless after $U(1)_{\nu}$ breaking -- similar to SM neutrinos -- and (ii) accidental global symmetries translate into stable massive particles -- similar to SM protons. These ingredients provide a solution to the dark matter and neutrino mass puzzles assuming one also postulates the existence of heavy degrees of freedom that act as "mediators" between the two sectors. The neutrino mass mechanism described here leads to parametrically small Dirac neutrino masses, and the model also requires the existence of at least four Dirac sterile neutrinos. Finally, we describe a general technique to write down chiral-fermions-only models that are at least anomaly-free under a $U(1)$ gauge symmetry. |
hep-ph/0001102 | Bugra Borasoy | B. Borasoy | The eta' in baryon chiral perturbation theory | 16 pages, 2 figures | Phys.Rev. D61 (2000) 014011 | 10.1103/PhysRevD.61.014011 | null | hep-ph nucl-th | null | We include in a systematic way the eta' in baryon chiral perturbation theory.
The most general relativistic effective Lagrangian describing the interaction
of the lowest lying baryon octet with the Goldstone boson octet and the eta' is
presented up to linear order in the derivative expansion and its heavy baryon
limit is obtained. As explicit examples, we calculate the baryon masses and the
pi N sigma-term up to one-loop order in the heavy baryon formulation. A
systematic expansion in the meson masses is possible, and appearing divergences
are renormalized.
| [
{
"created": "Wed, 12 Jan 2000 20:25:39 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Borasoy",
"B.",
""
]
] | We include in a systematic way the eta' in baryon chiral perturbation theory. The most general relativistic effective Lagrangian describing the interaction of the lowest lying baryon octet with the Goldstone boson octet and the eta' is presented up to linear order in the derivative expansion and its heavy baryon limit is obtained. As explicit examples, we calculate the baryon masses and the pi N sigma-term up to one-loop order in the heavy baryon formulation. A systematic expansion in the meson masses is possible, and appearing divergences are renormalized. |
1711.04914 | Bo-Lin Li | Bo-Lin Li, Zhu-Fang Cui, Bo-Wen Zhou, Sun An, Li-Ping Zhang, and
Hong-Shi Zong | Finite volume effects on the chiral phase transition from
Dyson-Schwinger equations of QCD | 6 pages, 4 figures | Nuclear Physics B 938 (2019) 298 | 10.1016/j.nuclphysb.2018.11.015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the framework of Dyson-Schwinger equations of QCD, we study the finite
volume effects on the chiral phase transition, especially the influence on the
position of the possible pseudo-critical end point (pCEP). The results show
that in the chiral limit case (the current quark mass $m=0$), the absolute
value of quark condensate decreases for smaller volumes, and more
interestingly, so does the pseudo-critical temperature $T_c(\mu=0)$, which is
in agreement with the Polyakov Nambu--Jona-Lasinio model result and opposite to
the Polyakov linear sigma model prediction. These conclusions hold for $m>0$
case in our calculations. Moreover, the results of pCEP as a function of
different volumes show that $T$ of pCEP also decreases for smaller volumes, but
$\mu$ of pCEP will increase, which are qualitatively more close to Polyakov
linear sigma model results. For our model setup, results for systems with a
size larger than (5 fm)$^3$ closely approximate those from infinite volume, but
if the volume is smaller, the corrections are non-negligible, even
significantly affect signatures of the results from an infinite system. There
also exists some possibility that, if the system size is too small, the whole
phase transition would be crossover, which means no pCEP exists at all. It is
no doubt that, finite volume effects deserve further researches.
| [
{
"created": "Tue, 14 Nov 2017 02:44:59 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Nov 2018 13:39:26 GMT",
"version": "v2"
}
] | 2018-12-03 | [
[
"Li",
"Bo-Lin",
""
],
[
"Cui",
"Zhu-Fang",
""
],
[
"Zhou",
"Bo-Wen",
""
],
[
"An",
"Sun",
""
],
[
"Zhang",
"Li-Ping",
""
],
[
"Zong",
"Hong-Shi",
""
]
] | Within the framework of Dyson-Schwinger equations of QCD, we study the finite volume effects on the chiral phase transition, especially the influence on the position of the possible pseudo-critical end point (pCEP). The results show that in the chiral limit case (the current quark mass $m=0$), the absolute value of quark condensate decreases for smaller volumes, and more interestingly, so does the pseudo-critical temperature $T_c(\mu=0)$, which is in agreement with the Polyakov Nambu--Jona-Lasinio model result and opposite to the Polyakov linear sigma model prediction. These conclusions hold for $m>0$ case in our calculations. Moreover, the results of pCEP as a function of different volumes show that $T$ of pCEP also decreases for smaller volumes, but $\mu$ of pCEP will increase, which are qualitatively more close to Polyakov linear sigma model results. For our model setup, results for systems with a size larger than (5 fm)$^3$ closely approximate those from infinite volume, but if the volume is smaller, the corrections are non-negligible, even significantly affect signatures of the results from an infinite system. There also exists some possibility that, if the system size is too small, the whole phase transition would be crossover, which means no pCEP exists at all. It is no doubt that, finite volume effects deserve further researches. |
hep-ph/9502390 | Ugo Aglietti | Ugo Aglietti | Parton densities beyond perturbation theory | 21 pages, latex | Nucl.Phys. B451 (1995) 605-621 | 10.1016/0550-3213(95)00393-7 | Caltech preprint 68 1982 | hep-ph | null | Non perturbative corrections to deep inelastic scattering are computed.
| [
{
"created": "Mon, 27 Feb 1995 00:00:12 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Aglietti",
"Ugo",
""
]
] | Non perturbative corrections to deep inelastic scattering are computed. |
2404.03352 | Maximilian Mahlein | Maximilian Mahlein, Chiara Pinto, Laura Fabbietti | ToMCCA: A Toy Monte Carlo Coalescence Afterburner | 15 pages, 7 figures | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The study of antinuclei in cosmic rays provides a unique opportunity to probe
physics beyond the Standard Model. Antinuclei in our Galaxy may stem either
from annihilation or decay of dark matter, or from collisions of cosmic rays
with the interstellar medium, which constitute the background of indirect dark
matter searches. Understanding the formation mechanism of (anti)nuclei is
crucial for setting limits on their production in space. Coalescence models,
which describe the formation of light nuclei from final-state interaction of
nucleons, have been widely employed in high-energy collisions. In this work, we
introduce ToMCCA (Toy Monte Carlo Coalescence Afterburner), which allows for
detailed studies of the nuclear formation processes without the overload of
general-purpose event generators. ToMCCA contains parameterizations of the
multiplicity dependence of the transverse momentum distributions of protons and
of the baryon-emitting source size, extracted from ALICE measurements in pp
collisions at $\sqrt{s} = 5 - 13$ TeV, as well as of the event multiplicity
distributions, taken from the EPOS event generator. ToMCCA provides predictions
of the deuteron transverse momentum distributions, with an agreement of
$\sim5\%$ with the experimental data. The results of ToMCCA show that the
coalescence mechanism in pp collisions depends only on the event multiplicity
rather than on the collision system or its energy. This allows the model to be
utilized for predictions at lower center-of-mass collision energies, which are
the most relevant for the production of antinuclei from processes related to
dark matter. This model can also be extended to heavier nuclei as long as the
target nucleus wave function and its Wigner function are known.
| [
{
"created": "Thu, 4 Apr 2024 10:40:24 GMT",
"version": "v1"
}
] | 2024-04-05 | [
[
"Mahlein",
"Maximilian",
""
],
[
"Pinto",
"Chiara",
""
],
[
"Fabbietti",
"Laura",
""
]
] | The study of antinuclei in cosmic rays provides a unique opportunity to probe physics beyond the Standard Model. Antinuclei in our Galaxy may stem either from annihilation or decay of dark matter, or from collisions of cosmic rays with the interstellar medium, which constitute the background of indirect dark matter searches. Understanding the formation mechanism of (anti)nuclei is crucial for setting limits on their production in space. Coalescence models, which describe the formation of light nuclei from final-state interaction of nucleons, have been widely employed in high-energy collisions. In this work, we introduce ToMCCA (Toy Monte Carlo Coalescence Afterburner), which allows for detailed studies of the nuclear formation processes without the overload of general-purpose event generators. ToMCCA contains parameterizations of the multiplicity dependence of the transverse momentum distributions of protons and of the baryon-emitting source size, extracted from ALICE measurements in pp collisions at $\sqrt{s} = 5 - 13$ TeV, as well as of the event multiplicity distributions, taken from the EPOS event generator. ToMCCA provides predictions of the deuteron transverse momentum distributions, with an agreement of $\sim5\%$ with the experimental data. The results of ToMCCA show that the coalescence mechanism in pp collisions depends only on the event multiplicity rather than on the collision system or its energy. This allows the model to be utilized for predictions at lower center-of-mass collision energies, which are the most relevant for the production of antinuclei from processes related to dark matter. This model can also be extended to heavier nuclei as long as the target nucleus wave function and its Wigner function are known. |
hep-ph/9606434 | Jisuke Kubo | Jisuke Kubo, Myriam Mondragon, Marek Olechowski, George Zoupanos | Unification of Gauge and Yukawa Couplings without Symmetry | 23 pages | null | null | Kanazawa University Report KANAZAWA-96-09 | hep-ph | null | A natural gradual extension of the idea of Grand Unification is to attempt to
relate the gauge and Yukawa couplings; Gauge-Yukawa Unification (GYU). However,
within the framework of renormalizable field theories, there exists no
realistic symmetry that leads to a GYU. Here we propose an approach to GYU
which is based on the principle of the reduction of couplings and finiteness in
supersymmetric Grand Unified Theories. We elucidate how the observed top-bottom
mass hierarchy can be explained in terms of supersymmetric GYU by considering
an example of the $SU(5)$ Finite Unified Theory. It is expected that, when more
accurate measurements of the top and bottom quark masses are available, it will
be possible to discriminate among the various GYU models.
| [
{
"created": "Wed, 26 Jun 1996 06:37:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kubo",
"Jisuke",
""
],
[
"Mondragon",
"Myriam",
""
],
[
"Olechowski",
"Marek",
""
],
[
"Zoupanos",
"George",
""
]
] | A natural gradual extension of the idea of Grand Unification is to attempt to relate the gauge and Yukawa couplings; Gauge-Yukawa Unification (GYU). However, within the framework of renormalizable field theories, there exists no realistic symmetry that leads to a GYU. Here we propose an approach to GYU which is based on the principle of the reduction of couplings and finiteness in supersymmetric Grand Unified Theories. We elucidate how the observed top-bottom mass hierarchy can be explained in terms of supersymmetric GYU by considering an example of the $SU(5)$ Finite Unified Theory. It is expected that, when more accurate measurements of the top and bottom quark masses are available, it will be possible to discriminate among the various GYU models. |
hep-ph/0610147 | Erhan Iltan | E. O. Iltan, B. Korutlu | Lepton flavor violating radion decays in the Randall-Sundrum scenario | 6 pages, 6 figures, 1 table | Phys.Scripta77:065101,2008 | 10.1088/0031-8949/77/06/065101 | null | hep-ph | null | We predict the branching ratios of lepton flavor violating radion decays r ->
e^{\pm} \mu^{\pm}, r -> e^{\pm} \tau^{\pm} and r -> \mu^{\pm} \tau^{\pm} in the
two Higgs doublet model, in the framework of the Randall Sundurum scenario. We
observe that the branching ratios of the processes we study are at most at the
order of 10^{-8} for the small values of radion mass and it decreases with the
increasing values of m_r. Among the LFV decays we study, the r -> \tau^{\pm}
\mu^{\pm} decay would be the most suitable one to measure its branching ratio.
| [
{
"created": "Wed, 11 Oct 2006 22:39:13 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Apr 2008 13:00:50 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Iltan",
"E. O.",
""
],
[
"Korutlu",
"B.",
""
]
] | We predict the branching ratios of lepton flavor violating radion decays r -> e^{\pm} \mu^{\pm}, r -> e^{\pm} \tau^{\pm} and r -> \mu^{\pm} \tau^{\pm} in the two Higgs doublet model, in the framework of the Randall Sundurum scenario. We observe that the branching ratios of the processes we study are at most at the order of 10^{-8} for the small values of radion mass and it decreases with the increasing values of m_r. Among the LFV decays we study, the r -> \tau^{\pm} \mu^{\pm} decay would be the most suitable one to measure its branching ratio. |
hep-ph/0508129 | Bernd Kniehl | B.A. Kniehl, G. Kramer, I. Schienbein, and H. Spiesberger | Reconciling open charm production at the Fermilab Tevatron with QCD | 9 pages, 8 figures | Phys.Rev.Lett.96:012001,2006 | 10.1103/PhysRevLett.96.012001 | DESY 05-146, MZ-TH/05-16 | hep-ph hep-ex | null | We study the inclusive hadrodroduction of D^0, D^+, D^{*+}, and D_s^+ mesons
at next-to-leading order in the parton model of quantum chromodynamics endowed
with universal non-perturbative fragmentation functions (FFs) fitted to e^+e^-
annihilation data from CERN LEP1. Working in the general-mass
variable-flavor-number scheme, we resum the large logarithms through the
evolution of the FFs and, at the same time, retain the full dependence on the
charm-quark mass without additional theoretical assumptions. In this way, the
cross section distributions in transverse momentum recently measured by the CDF
Collaboration in run II at the Fermilab Tevatron are described within errors.
| [
{
"created": "Thu, 11 Aug 2005 12:32:41 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Kniehl",
"B. A.",
""
],
[
"Kramer",
"G.",
""
],
[
"Schienbein",
"I.",
""
],
[
"Spiesberger",
"H.",
""
]
] | We study the inclusive hadrodroduction of D^0, D^+, D^{*+}, and D_s^+ mesons at next-to-leading order in the parton model of quantum chromodynamics endowed with universal non-perturbative fragmentation functions (FFs) fitted to e^+e^- annihilation data from CERN LEP1. Working in the general-mass variable-flavor-number scheme, we resum the large logarithms through the evolution of the FFs and, at the same time, retain the full dependence on the charm-quark mass without additional theoretical assumptions. In this way, the cross section distributions in transverse momentum recently measured by the CDF Collaboration in run II at the Fermilab Tevatron are described within errors. |
0807.3688 | Andreas Metz | S. Arnold, A. Metz, W. Vogelsang | Longitudinal Single-Spin Asymmetries in Proton-Proton Scattering with a
Hadronic Final State | 7 pages, 7 figures, talk given by S. Arnold at the conference
SPIN-Praha-2007 | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider longitudinal, parity-violating single-spin asymmetries in
proton-proton collisions at RHIC. The focus of this study is on the production
of single-inclusive jets, as well as on jets that contain a charm quark. While
the asymmetry for inclusive jets turns out to be small, we find considerably
larger effects for the case of charm production. We also investigate the role
of leading threshold logarithms and find that they increase the polarized and
unpolarized cross sections and reduce the spin asymmetry.
| [
{
"created": "Wed, 23 Jul 2008 14:44:04 GMT",
"version": "v1"
}
] | 2008-07-28 | [
[
"Arnold",
"S.",
""
],
[
"Metz",
"A.",
""
],
[
"Vogelsang",
"W.",
""
]
] | We consider longitudinal, parity-violating single-spin asymmetries in proton-proton collisions at RHIC. The focus of this study is on the production of single-inclusive jets, as well as on jets that contain a charm quark. While the asymmetry for inclusive jets turns out to be small, we find considerably larger effects for the case of charm production. We also investigate the role of leading threshold logarithms and find that they increase the polarized and unpolarized cross sections and reduce the spin asymmetry. |
2003.09021 | Nikolaos Kidonakis | Matthew Forslund and Nikolaos Kidonakis | Resummation for $2\rightarrow n$ processes in single-particle-inclusive
kinematics | 17 pages; published version | Phys. Rev. D 102, 034006 (2020) | 10.1103/PhysRevD.102.034006 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a formalism and detailed analytical results for soft-gluon
resummation for $2\rightarrow n$ processes in single-particle-inclusive (1PI)
kinematics. This generalizes previous work on resummation for $2 \rightarrow 2$
processes in 1PI kinematics. We also present soft anomalous dimensions at one
and two loops for certain $2 \rightarrow 3$ processes involving top quarks and
Higgs or $Z$ bosons, and we provide some brief numerical results.
| [
{
"created": "Thu, 19 Mar 2020 21:16:44 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Aug 2020 15:13:01 GMT",
"version": "v2"
}
] | 2020-08-12 | [
[
"Forslund",
"Matthew",
""
],
[
"Kidonakis",
"Nikolaos",
""
]
] | We present a formalism and detailed analytical results for soft-gluon resummation for $2\rightarrow n$ processes in single-particle-inclusive (1PI) kinematics. This generalizes previous work on resummation for $2 \rightarrow 2$ processes in 1PI kinematics. We also present soft anomalous dimensions at one and two loops for certain $2 \rightarrow 3$ processes involving top quarks and Higgs or $Z$ bosons, and we provide some brief numerical results. |
hep-ph/0009239 | Marc Vanderhaeghen | M. Vanderhaeghen, D. Drechsel, M. Gorchtein, A. Metz, and B. Pasquini | Dispersion analysis for generalized spin polarizabilities | 5pages, 2 figures, to appear in the Proceedings of the Symposium on
the Gerasimov-Drell-Hearn Sum Rule and the Spin Structure in the Nucleon
Resonance Region (GDH2000), June 14-17 2000, Mainz, Germany | null | 10.1142/9789812811448_0026 | null | hep-ph | null | We report on a dispersion relation formalism for the virtual Compton
scattering (VCS) reaction on the proton, which for the first time allows a
dispersive evaluation of 4 generalized polarizabilities. The dispersion
formalism provides a new tool to analyze VCS experiments above pion threshold,
thus increasing the sensitivity to the generalized polarizabilities of the
nucleon.
| [
{
"created": "Wed, 20 Sep 2000 17:12:15 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Vanderhaeghen",
"M.",
""
],
[
"Drechsel",
"D.",
""
],
[
"Gorchtein",
"M.",
""
],
[
"Metz",
"A.",
""
],
[
"Pasquini",
"B.",
""
]
] | We report on a dispersion relation formalism for the virtual Compton scattering (VCS) reaction on the proton, which for the first time allows a dispersive evaluation of 4 generalized polarizabilities. The dispersion formalism provides a new tool to analyze VCS experiments above pion threshold, thus increasing the sensitivity to the generalized polarizabilities of the nucleon. |
hep-ph/0411159 | JoAnne Hewett | Klaus Desch, JoAnne Hewett, Akiya Miyamoto, Yasuhiro Okada, Mark
Oreglia, Georg Weiglein, Satoru Yamashita | The Linear Collider Physics Case: International Response to the
Technology Independent Questions Posed by the International Technology
Recommendation Panel | Presented at International Conference on Linear Colliders (LCWS04),
Paris, France, 19-24 April, 2004 | null | null | SLAC-PUB-10853, IPPP/04/72, DCPT/04/144 | hep-ph | null | The International Technology Recommendation Panel distributed a list of
questions to each major laboratory. Question 30, part b and d, were technology
independent and related to the physics goals of the Linear Collider. An
international panel, with representation from Asia, Europe, and the Americas,
was formed by the World Wide Study during LCWS04 to formulate a response. This
is given below and constitutes the response of the world-wide Linear Collider
community.
| [
{
"created": "Thu, 11 Nov 2004 19:07:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Desch",
"Klaus",
""
],
[
"Hewett",
"JoAnne",
""
],
[
"Miyamoto",
"Akiya",
""
],
[
"Okada",
"Yasuhiro",
""
],
[
"Oreglia",
"Mark",
""
],
[
"Weiglein",
"Georg",
""
],
[
"Yamashita",
"Satoru",
""
]
] | The International Technology Recommendation Panel distributed a list of questions to each major laboratory. Question 30, part b and d, were technology independent and related to the physics goals of the Linear Collider. An international panel, with representation from Asia, Europe, and the Americas, was formed by the World Wide Study during LCWS04 to formulate a response. This is given below and constitutes the response of the world-wide Linear Collider community. |
1312.5076 | Emiliano Molinaro | Emiliano Molinaro | Natural seesaw realization at the TeV scale | 6 pages, 1 figure. Prepared for the 2013 European Society Conference
on High Energy Physics (EPS-HEP 2013), Stockholm, Sweden, 18-24 July 2013 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We summarize the phenomenological constraints on seesaw scenarios defined at
the TeV scale and provide a simple extension of the Standard Model which
naturally leads to a testable mechanism of neutrino mass generation.
| [
{
"created": "Wed, 18 Dec 2013 09:44:45 GMT",
"version": "v1"
}
] | 2013-12-19 | [
[
"Molinaro",
"Emiliano",
""
]
] | We summarize the phenomenological constraints on seesaw scenarios defined at the TeV scale and provide a simple extension of the Standard Model which naturally leads to a testable mechanism of neutrino mass generation. |
hep-ph/0611179 | Kim Maltman | Kim Maltman | OPE Constraints and the Leading Order Hadronic Contribution to (g-2)_mu | 6 pages, 5 figures, prepared for the Proceedings of the 9th
International Workshop on Tau Lepton Physics | Nucl.Phys.Proc.Suppl.169:244-249,2007 | 10.1016/j.nuclphysbps.2007.03.003 | null | hep-ph | null | OPE constraints are studied as a means of distinguishing between the versions
of the I=1 vector spectral function extracted from (i) inclusive I=1 hadronic
electroproduction cross-sections and (ii) inclusive I=1 hadronic tau decay
data, with the goal of clarifying expectations for the leading order hadronic
contribution to a_mu = (g-2)_mu /2 in the Standard Model. The constraints are
shown to, at present, favor the tau decay data, and hence a Standard Model
prediction for a_mu compatible with the BNL E821 experimental result. The
relative role of the 2pi and 4pi contributions to the discrepancy between the
integrated electroproduction results and the corresponding OPE constraints is
also investigated, and the significance, in this context, of forthcoming
re-measurements of the e^+e^- --> pi^+ pi^- pi^0 pi^0 cross-sections pointed
out.
| [
{
"created": "Mon, 13 Nov 2006 20:02:07 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Maltman",
"Kim",
""
]
] | OPE constraints are studied as a means of distinguishing between the versions of the I=1 vector spectral function extracted from (i) inclusive I=1 hadronic electroproduction cross-sections and (ii) inclusive I=1 hadronic tau decay data, with the goal of clarifying expectations for the leading order hadronic contribution to a_mu = (g-2)_mu /2 in the Standard Model. The constraints are shown to, at present, favor the tau decay data, and hence a Standard Model prediction for a_mu compatible with the BNL E821 experimental result. The relative role of the 2pi and 4pi contributions to the discrepancy between the integrated electroproduction results and the corresponding OPE constraints is also investigated, and the significance, in this context, of forthcoming re-measurements of the e^+e^- --> pi^+ pi^- pi^0 pi^0 cross-sections pointed out. |
0707.1101 | Thomas Mehen | Ahmad Idilbi (Duke U.), Thomas Mehen (Duke U. & Jefferson Lab) | Demonstration of the Equivalence of Soft and Zero-Bin Subtractions | 14 pages, 3 figures | Phys.Rev.D76:094015,2007 | 10.1103/PhysRevD.76.094015 | null | hep-ph | null | Calculations of collinear correlation functions in perturbative QCD and
Soft-Collinear Effective Theory (SCET) require a prescription for subtracting
soft or zero-bin contributions in order to avoid double counting the
contributions from soft modes. At leading order in $\lambda$, where $\lambda$
is the SCET expansion parameter, the zero-bin subtractions have been argued to
be equivalent to convolution with soft Wilson lines. We give a proof of the
factorization of naive collinear Wilson lines that is crucial for the
derivation of the equivalence. We then check the equivalence by computing the
non-Abelian two-loop mixed collinear-soft contribution to the jet function in
the quark form factor. These results provide strong support for the
equivalence, which can be used to give a nonperturbative definition of the
zero-bin subtraction at lowest order in $\lambda$.
| [
{
"created": "Mon, 9 Jul 2007 14:03:55 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Idilbi",
"Ahmad",
"",
"Duke U."
],
[
"Mehen",
"Thomas",
"",
"Duke U. & Jefferson Lab"
]
] | Calculations of collinear correlation functions in perturbative QCD and Soft-Collinear Effective Theory (SCET) require a prescription for subtracting soft or zero-bin contributions in order to avoid double counting the contributions from soft modes. At leading order in $\lambda$, where $\lambda$ is the SCET expansion parameter, the zero-bin subtractions have been argued to be equivalent to convolution with soft Wilson lines. We give a proof of the factorization of naive collinear Wilson lines that is crucial for the derivation of the equivalence. We then check the equivalence by computing the non-Abelian two-loop mixed collinear-soft contribution to the jet function in the quark form factor. These results provide strong support for the equivalence, which can be used to give a nonperturbative definition of the zero-bin subtraction at lowest order in $\lambda$. |
1302.0423 | David Marzocca | David Marzocca, Serguey T. Petcov, Andrea Romanino, Maria C. Sevilla | Nonzero |U_e3| from Charged Lepton Corrections and the Atmospheric
Neutrino Mixing Angle | 35 pages, 10 figures. Version 3: addendum with an update of the
results based on global analyses including the 2013 data (pages 31-35) | JHEP Volume 2013, Number 05, 73 | 10.1007/JHEP05(2013)073 | SISSA 03/2013/FISI, IFIC/13-03 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After the successful determination of the reactor neutrino mixing angle
\theta_13 ~ 0.16 \neq 0, a new feature suggested by the current neutrino
oscillation data is a sizeable deviation of the atmospheric neutrino mixing
angle \theta_23 from \pi/4. Using the fact that the neutrino mixing matrix U =
U_e^\dagger U_\nu, where U_e and U_\nu result from the diagonalisation of the
charged lepton and neutrino mass matrices, and assuming that U_\nu has a i)
bimaximal (BM), ii) tri-bimaximal (TBM) form, or else iii) corresponds to the
conservation of the lepton charge L' = L_e - L_\mu - L_\tau (LC), we
investigate quantitatively what are the minimal forms of U_e, in terms of
angles and phases it contains, that can provide the requisite corrections to
U_\nu so that \theta_13, \theta_23 and the solar neutrino mixing angle
\theta_12 have values compatible with the current data. Two possible orderings
of the 12 and the 23 rotations in U_e, "standard" and "inverse", are
considered. The results we obtain depend strongly on the type of ordering. In
the case of "standard" ordering, in particular, the Dirac CP violation phase
\delta, present in U, is predicted to have a value in a narrow interval around
i) \delta ~ \pi in the BM (or LC) case, ii) \delta ~ 3\pi/2 or \pi/2 in the TBM
case, the CP conserving values \delta = 0, \pi, 2\pi being excluded in the TBM
case at more than 4\sigma. In the addendum we discuss the implications of the
latest 2013 data.
| [
{
"created": "Sat, 2 Feb 2013 20:14:12 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Jun 2013 13:23:30 GMT",
"version": "v2"
},
{
"created": "Wed, 29 Jan 2014 12:53:22 GMT",
"version": "v3"
}
] | 2014-01-30 | [
[
"Marzocca",
"David",
""
],
[
"Petcov",
"Serguey T.",
""
],
[
"Romanino",
"Andrea",
""
],
[
"Sevilla",
"Maria C.",
""
]
] | After the successful determination of the reactor neutrino mixing angle \theta_13 ~ 0.16 \neq 0, a new feature suggested by the current neutrino oscillation data is a sizeable deviation of the atmospheric neutrino mixing angle \theta_23 from \pi/4. Using the fact that the neutrino mixing matrix U = U_e^\dagger U_\nu, where U_e and U_\nu result from the diagonalisation of the charged lepton and neutrino mass matrices, and assuming that U_\nu has a i) bimaximal (BM), ii) tri-bimaximal (TBM) form, or else iii) corresponds to the conservation of the lepton charge L' = L_e - L_\mu - L_\tau (LC), we investigate quantitatively what are the minimal forms of U_e, in terms of angles and phases it contains, that can provide the requisite corrections to U_\nu so that \theta_13, \theta_23 and the solar neutrino mixing angle \theta_12 have values compatible with the current data. Two possible orderings of the 12 and the 23 rotations in U_e, "standard" and "inverse", are considered. The results we obtain depend strongly on the type of ordering. In the case of "standard" ordering, in particular, the Dirac CP violation phase \delta, present in U, is predicted to have a value in a narrow interval around i) \delta ~ \pi in the BM (or LC) case, ii) \delta ~ 3\pi/2 or \pi/2 in the TBM case, the CP conserving values \delta = 0, \pi, 2\pi being excluded in the TBM case at more than 4\sigma. In the addendum we discuss the implications of the latest 2013 data. |
2003.07321 | Igor Sharph | I.V. Sharph, T.M. Zelentsova, N.O. Chudak, O.S. Potiienko, D.A.
Ptashynskiy, K.K. Merkotan, T.V. Yushkevich, A.O. Milieva | Laplace method for the simplest diagrams of elastic scattering of scalar
particles | 31 pages, 10 figures, in Ukrainian (v2: same text, article
description corrected; v3: text and some figures updated) | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose an algorithm for the application of the Laplace method for the
calculation of the simplest Feynman diagram with a single loop in the scalar
{\phi}^3 theory. The calculation of the contribution of such a diagram to the
scattering amplitude requires the calculation of a fourfold integral over the
four-momenta components circulating in a loop. The essence of the Laplace
method for the calculation of multiple integrals lies in the fact that if the
module of an integrand has a point of sufficiently sharp maximum inside the
integration domain, then the integral can be replaced by a Gaussian integral by
representing the integrand in the form of an exponent from the logarithm and
expanding this logarithm into Taylor series in the vicinity of a maximum point
up to the second degree terms. We show that there are two-dimensional and
non-intersecting surfaces inside the four-dimensional region of integration, on
which the maximum of the module of integrand is reached. This leads to a
problem that the integrand is non-analytically dependent on the parameters
responsible for bypassing the poles. Also the derivatives of logarithm of the
scattering amplitude are non-analytically dependent on these parameters.
However, in the paper we show that these non-analyticities compensate each
other. As a result of such a procedure, three of the four integrations can be
done analytically, and the calculation of the contribution of the diagram to
the scattering amplitude is reduced to a numerical calculation of the single
integral in finite bounds from an expression that does not contain
non-analyticities. The described calculation method is used to construct a
model dependence of elastic scattering differential cross section
d{\sigma}_elastic/dt on the square of the transmitted four-momentum t
(Mandelstam variable).
| [
{
"created": "Mon, 16 Mar 2020 16:47:26 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Mar 2020 18:31:44 GMT",
"version": "v2"
},
{
"created": "Sun, 29 May 2022 20:09:58 GMT",
"version": "v3"
}
] | 2022-05-31 | [
[
"Sharph",
"I. V.",
""
],
[
"Zelentsova",
"T. M.",
""
],
[
"Chudak",
"N. O.",
""
],
[
"Potiienko",
"O. S.",
""
],
[
"Ptashynskiy",
"D. A.",
""
],
[
"Merkotan",
"K. K.",
""
],
[
"Yushkevich",
"T. V.",
""
],
[
"Milieva",
"A. O.",
""
]
] | We propose an algorithm for the application of the Laplace method for the calculation of the simplest Feynman diagram with a single loop in the scalar {\phi}^3 theory. The calculation of the contribution of such a diagram to the scattering amplitude requires the calculation of a fourfold integral over the four-momenta components circulating in a loop. The essence of the Laplace method for the calculation of multiple integrals lies in the fact that if the module of an integrand has a point of sufficiently sharp maximum inside the integration domain, then the integral can be replaced by a Gaussian integral by representing the integrand in the form of an exponent from the logarithm and expanding this logarithm into Taylor series in the vicinity of a maximum point up to the second degree terms. We show that there are two-dimensional and non-intersecting surfaces inside the four-dimensional region of integration, on which the maximum of the module of integrand is reached. This leads to a problem that the integrand is non-analytically dependent on the parameters responsible for bypassing the poles. Also the derivatives of logarithm of the scattering amplitude are non-analytically dependent on these parameters. However, in the paper we show that these non-analyticities compensate each other. As a result of such a procedure, three of the four integrations can be done analytically, and the calculation of the contribution of the diagram to the scattering amplitude is reduced to a numerical calculation of the single integral in finite bounds from an expression that does not contain non-analyticities. The described calculation method is used to construct a model dependence of elastic scattering differential cross section d{\sigma}_elastic/dt on the square of the transmitted four-momentum t (Mandelstam variable). |
1612.06858 | Andreas Crivellin | Estefania Coluccio Leskow, Andreas Crivellin, Giancarlo D'Ambrosio and
Dario M\"uller | $(g-2)_\mu$, Lepton Flavour Violation and $Z$ Decays with Leptoquarks:
Correlations and Future Prospects | 6 pages, 3 figures | Phys. Rev. D 95, 055018 (2017) | 10.1103/PhysRevD.95.055018 | PSI-PR-16-17, ZU-TH 44/16 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The long-standing anomaly in the anomalous magnetic moment of the muon
indicates the presence of chirality violating new physics contributions. A
possible solution involves scalar leptoquarks with left- and right-handed
couplings to the top quark. Two such representations of scalar leptoquarks
exist for which the contribution to $(g-2)_\mu$ can possess an $m_t/m_\mu$
enhancement compared to the Standard Model. The leptoquarks also induce loop
corrections to $Z$ couplings to muons which probe as well new physics
contributions which possess sources of $SU(2)$ symmetry breaking and we find
that this effect should be observable at future experiments as GigaZ or TLEP.
Furthermore, once interactions of the leptoquark with tau leptons and electrons
are present, additional correlated effects in anomalous magnetic moments,
$Z\to\ell\ell^\prime$ and $\ell\to\ell^\prime\gamma$ arise, which can be used
to test the model and to determine the flavour structure of the couplings. We
find that the two representations of leptoquarks can be distinguished also from
low energy experiments: one representation predicts constructive interference
with the Standard Model in $Z$ couplings to leptons and effects in $B\to
K^{(\star)}\nu\bar\nu$, while the other representation interferes destructively
with the Standard Model in $Z$ couplings to leptons and gives a
$C_9=C_{10}$-like contribution to $b\to s\ell^+\ell^-$ processes.
| [
{
"created": "Tue, 20 Dec 2016 21:00:00 GMT",
"version": "v1"
}
] | 2017-03-29 | [
[
"Leskow",
"Estefania Coluccio",
""
],
[
"Crivellin",
"Andreas",
""
],
[
"D'Ambrosio",
"Giancarlo",
""
],
[
"Müller",
"Dario",
""
]
] | The long-standing anomaly in the anomalous magnetic moment of the muon indicates the presence of chirality violating new physics contributions. A possible solution involves scalar leptoquarks with left- and right-handed couplings to the top quark. Two such representations of scalar leptoquarks exist for which the contribution to $(g-2)_\mu$ can possess an $m_t/m_\mu$ enhancement compared to the Standard Model. The leptoquarks also induce loop corrections to $Z$ couplings to muons which probe as well new physics contributions which possess sources of $SU(2)$ symmetry breaking and we find that this effect should be observable at future experiments as GigaZ or TLEP. Furthermore, once interactions of the leptoquark with tau leptons and electrons are present, additional correlated effects in anomalous magnetic moments, $Z\to\ell\ell^\prime$ and $\ell\to\ell^\prime\gamma$ arise, which can be used to test the model and to determine the flavour structure of the couplings. We find that the two representations of leptoquarks can be distinguished also from low energy experiments: one representation predicts constructive interference with the Standard Model in $Z$ couplings to leptons and effects in $B\to K^{(\star)}\nu\bar\nu$, while the other representation interferes destructively with the Standard Model in $Z$ couplings to leptons and gives a $C_9=C_{10}$-like contribution to $b\to s\ell^+\ell^-$ processes. |
1703.00250 | HyungJoo Kim | HyungJoo Kim, Su Houng Lee | Wilson coefficients of dimension 6 gluon operators with spin indices in
the heavy quark current correlation functions | 11 pages, 8 figures; fixed a typo | null | 10.1016/j.nuclphysa.2017.08.002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the Wilson coefficients of dimension 6 gluon operators with spin
indices in the two point correlation function of the heavy scalar,
pseudoscalar, and axialvector currents. Our result completes the list of all
Wilson coefficients of gluon operators up to dimension 6 for the correlation
functions between heavy quark currents without derivatives. We then use the
result to investigate the stability of the QCD sum rule results for the
$\eta_c$, $J/\Psi$, $\chi_{c0}$, and $\chi_{c1}$ mesons near $T_c$. While the
inclusion of the dimension 6 operators increases the stability of the sum rules
for all currents, all of them break down slightly above $T_c$ with that for the
$J/\psi$ persisting to relatively highest temperature.
| [
{
"created": "Wed, 1 Mar 2017 11:50:40 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Mar 2017 11:32:47 GMT",
"version": "v2"
}
] | 2018-03-14 | [
[
"Kim",
"HyungJoo",
""
],
[
"Lee",
"Su Houng",
""
]
] | We calculate the Wilson coefficients of dimension 6 gluon operators with spin indices in the two point correlation function of the heavy scalar, pseudoscalar, and axialvector currents. Our result completes the list of all Wilson coefficients of gluon operators up to dimension 6 for the correlation functions between heavy quark currents without derivatives. We then use the result to investigate the stability of the QCD sum rule results for the $\eta_c$, $J/\Psi$, $\chi_{c0}$, and $\chi_{c1}$ mesons near $T_c$. While the inclusion of the dimension 6 operators increases the stability of the sum rules for all currents, all of them break down slightly above $T_c$ with that for the $J/\psi$ persisting to relatively highest temperature. |
2112.12798 | Basabendu Barman | Basabendu Barman, Purusottam Ghosh, Anish Ghoshal, Lopamudra Mukherjee | Shedding Flavor on Dark via Freeze-in: $U(1)_{B-3L_i}$ Gauged Extensions | 27 pages, 7 figures, 1 Table. Version accepted for publication in
JCAP | null | 10.1088/1475-7516/2022/08/049 | PI/UAN-2021-709FT, HRI-RECAPP-2021-013 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We consider a singlet fermionic dark matter (DM) $\chi$ in a gauged
$U(1)_{B-3L_i}$ extension of the Standard Model (SM), with $i\in
e\,,\mu\,,\tau$, and derive bounds on the allowed parameter space, considering
its production via freeze-in mechanism. The DM communicates with the SM only
through flavorful vector-portal $Z_\text{B3L}$ due to its non-trivial charge
$x$ under $U(1)_{B-3L_{i}}$, which also guarantees the stability of the DM over
the age of the Universe for $x\neq\{\pm 3/2,\pm 3\}$. Considering
$Z_\text{B3L}$ to lie within the mass range of a few MeV up to a few GeV, we
obtain constraints on the gauge coupling $g_\text{B3L}$ from the requirement of
producing right relic abundance. Taking limits from various (present and
future) experimental facilities, e.g., NuCal, NA64, FASER, SHiP into account,
we show that the relic density allowed parameter space for the frozen in DM can
be probed with $g_\text{B3L}\gtrsim 10^{-8}$ for both $m_\chi<m_\text{ZB3L}/2$
and $m_\chi\gtrsim m_\text{ZB3L}$, while $g_\text{B3L}\lesssim 10^{-8}$ remains
mostly unconstrained. We also briefly comment on the implications of neutrino
mass generation via Type-I seesaw and anomalous $(g-2)_\mu$ in context with
$B-3L_\mu$ gauged symmetry.
| [
{
"created": "Thu, 23 Dec 2021 19:00:30 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jul 2022 16:50:05 GMT",
"version": "v2"
}
] | 2022-08-31 | [
[
"Barman",
"Basabendu",
""
],
[
"Ghosh",
"Purusottam",
""
],
[
"Ghoshal",
"Anish",
""
],
[
"Mukherjee",
"Lopamudra",
""
]
] | We consider a singlet fermionic dark matter (DM) $\chi$ in a gauged $U(1)_{B-3L_i}$ extension of the Standard Model (SM), with $i\in e\,,\mu\,,\tau$, and derive bounds on the allowed parameter space, considering its production via freeze-in mechanism. The DM communicates with the SM only through flavorful vector-portal $Z_\text{B3L}$ due to its non-trivial charge $x$ under $U(1)_{B-3L_{i}}$, which also guarantees the stability of the DM over the age of the Universe for $x\neq\{\pm 3/2,\pm 3\}$. Considering $Z_\text{B3L}$ to lie within the mass range of a few MeV up to a few GeV, we obtain constraints on the gauge coupling $g_\text{B3L}$ from the requirement of producing right relic abundance. Taking limits from various (present and future) experimental facilities, e.g., NuCal, NA64, FASER, SHiP into account, we show that the relic density allowed parameter space for the frozen in DM can be probed with $g_\text{B3L}\gtrsim 10^{-8}$ for both $m_\chi<m_\text{ZB3L}/2$ and $m_\chi\gtrsim m_\text{ZB3L}$, while $g_\text{B3L}\lesssim 10^{-8}$ remains mostly unconstrained. We also briefly comment on the implications of neutrino mass generation via Type-I seesaw and anomalous $(g-2)_\mu$ in context with $B-3L_\mu$ gauged symmetry. |
hep-ph/0507263 | Yann Mambrini | Y. Mambrini, E. Nezri | Dark matter and Colliders searches in the MSSM | 25 pages, 10 figures, corrected typos and reference added | Eur.Phys.J.C50:949-968,2007 | 10.1140/epjc/s10052-007-0238-2 | null | hep-ph | null | We study the complementarity between dark matter experiments (direct
detection and indirect detections) and accelerator facilities (the CERN LHC and
a $\sqrt{s}= 1$ TeV $e^+e^-$ Linear Collider) in the framework of the
constrained Minimal Supersymmetric Standard Model (MSSM). We show how
non--universality in the scalar and gaugino sectors can affect the experimental
prospects to discover the supersymmetric particles. The future experiments will
cover a large part of the parameter space of the MSSM favored by WMAP
constraint on the relic density, but there still exist some regions beyond
reach for some extreme (fine tuned) values of the supersymmetric parameters.
Whereas the Focus Point region characterized by heavy scalars will be easily
probed by experiments searching for dark matter, the regions with heavy
gauginos and light sfermions will be accessible more easily by collider
experiments. More informations on both supersymmetry and astrophysics
parameters can be thus obtained by correlating the different signals.
| [
{
"created": "Fri, 22 Jul 2005 14:37:21 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jul 2005 13:10:28 GMT",
"version": "v2"
},
{
"created": "Thu, 9 Feb 2006 19:09:24 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Mambrini",
"Y.",
""
],
[
"Nezri",
"E.",
""
]
] | We study the complementarity between dark matter experiments (direct detection and indirect detections) and accelerator facilities (the CERN LHC and a $\sqrt{s}= 1$ TeV $e^+e^-$ Linear Collider) in the framework of the constrained Minimal Supersymmetric Standard Model (MSSM). We show how non--universality in the scalar and gaugino sectors can affect the experimental prospects to discover the supersymmetric particles. The future experiments will cover a large part of the parameter space of the MSSM favored by WMAP constraint on the relic density, but there still exist some regions beyond reach for some extreme (fine tuned) values of the supersymmetric parameters. Whereas the Focus Point region characterized by heavy scalars will be easily probed by experiments searching for dark matter, the regions with heavy gauginos and light sfermions will be accessible more easily by collider experiments. More informations on both supersymmetry and astrophysics parameters can be thus obtained by correlating the different signals. |
hep-ph/9606464 | Alexander V. Vereshagin | Vladimir V. Vereshagin | Tree-level (pi, K)-amplitude and analyticity | null | Phys.Rev. D55 (1997) 5349-5361 | 10.1103/PhysRevD.55.5349 | SPbU-TP-96-20 | hep-ph | null | We consider the tree-level amplitude, describing all 3 channels of the binary
(pi ,K)-reaction, as a meromorphic polynomially bounded function of 3 dependent
complex variables. Relying systematically on the Mittag-Leffler theorem, we
construct 3 convergent partial fraction expansions, each one being applied in
the corresponding domain. Noting, that the mutual intersections of those
domains are nonempty, we realize the analytical continuation. It is shown that
the necessary conditions to make such a continuation feasible, are the
following: 1) The only parameters completely determining the amplitude are the
on-shell couplings and masses; 2) These parameters are restricted by a certain
(infinite) system of bootstrap equations; 3) The full cross-symmetric amplitude
takes the typically dual form, the Pomeron contribution being taken into
account; 4)This latter contribution corresponds to a nonresonant background,
which, in turn, is expressed in terms of cross-channel resonances parameters.
It is demonstrated also, that the Chiral Symmetry provides a unique scale for
the mentioned parameters, the resonance saturation effect appearing as a direct
consequence of the above results.
| [
{
"created": "Fri, 28 Jun 1996 03:53:09 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Vereshagin",
"Vladimir V.",
""
]
] | We consider the tree-level amplitude, describing all 3 channels of the binary (pi ,K)-reaction, as a meromorphic polynomially bounded function of 3 dependent complex variables. Relying systematically on the Mittag-Leffler theorem, we construct 3 convergent partial fraction expansions, each one being applied in the corresponding domain. Noting, that the mutual intersections of those domains are nonempty, we realize the analytical continuation. It is shown that the necessary conditions to make such a continuation feasible, are the following: 1) The only parameters completely determining the amplitude are the on-shell couplings and masses; 2) These parameters are restricted by a certain (infinite) system of bootstrap equations; 3) The full cross-symmetric amplitude takes the typically dual form, the Pomeron contribution being taken into account; 4)This latter contribution corresponds to a nonresonant background, which, in turn, is expressed in terms of cross-channel resonances parameters. It is demonstrated also, that the Chiral Symmetry provides a unique scale for the mentioned parameters, the resonance saturation effect appearing as a direct consequence of the above results. |
hep-ph/9612425 | Igor Halperin | Igor Halperin, Ariel Zhitnitsky (University of British Columbia) | Hard diffractive electroproduction, transverse momentum distribution and
QCD vacuum structure | 27 pages (LaTex), 1 figure (epsfig) | Phys.Rev. D56 (1997) 184-197 | 10.1103/PhysRevD.56.184 | null | hep-ph | null | We study the impact of the "intrinsic" hadron transverse momentum on the
pre-asymptotic behavior of the diffractive electroproduction of longitudinally
polarized $ \rho$-meson. Surprisingly, we find the onset of the asymptotic
regime in this problem to be rather low, Q^2 ~ 10 GeV^2 where power corrections
due to the transverse momentum do not exceed 20 % in the amplitude. This
drastically contrasts with exclusive amplitudes where the asymptotics starts at
much higher Q^2 = 50 - 100 GeV^2. The sources of such unexpected behavior are
traced back to some general (the quark-hadron duality) as well as more silent
(properties of higher dimensional vacuum condensates) features of QCD.
| [
{
"created": "Fri, 20 Dec 1996 00:07:31 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Halperin",
"Igor",
"",
"University of British Columbia"
],
[
"Zhitnitsky",
"Ariel",
"",
"University of British Columbia"
]
] | We study the impact of the "intrinsic" hadron transverse momentum on the pre-asymptotic behavior of the diffractive electroproduction of longitudinally polarized $ \rho$-meson. Surprisingly, we find the onset of the asymptotic regime in this problem to be rather low, Q^2 ~ 10 GeV^2 where power corrections due to the transverse momentum do not exceed 20 % in the amplitude. This drastically contrasts with exclusive amplitudes where the asymptotics starts at much higher Q^2 = 50 - 100 GeV^2. The sources of such unexpected behavior are traced back to some general (the quark-hadron duality) as well as more silent (properties of higher dimensional vacuum condensates) features of QCD. |
hep-ph/9411234 | Aneesh Manohar | Roger Dashen, Elizabeth Jenkins, and Aneesh V. Manohar | Spin-Flavor Structure of Large N Baryons | 36 pages, 2 eps figures, uses revtex | Phys.Rev.D51:3697-3727,1995 | 10.1103/PhysRevD.51.3697 | PUPT-1505, UCSD/PTH 94-18 | hep-ph hep-th | null | The spin-flavor structure of large N baryons is described in the 1/N
expansion of QCD using quark operators. The complete set of quark operator
identities is obtained, and used to derive an operator reduction rule which
simplifies the 1/N expansion. The operator reduction rule is applied to the
axial currents, masses, magnetic moments and hyperon non-leptonic decay
amplitudes in the $SU(3)$ limit, to first order in $SU(3)$ breaking, and
without assuming $SU(3)$ symmetry. The connection between the Skyrme and quark
representations is discussed. An explicit formula is given for the quark model
operators in terms of the Skyrme model operators to all orders in $1/\N$ for
the two flavor case.
| [
{
"created": "Mon, 7 Nov 1994 22:40:28 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Dashen",
"Roger",
""
],
[
"Jenkins",
"Elizabeth",
""
],
[
"Manohar",
"Aneesh V.",
""
]
] | The spin-flavor structure of large N baryons is described in the 1/N expansion of QCD using quark operators. The complete set of quark operator identities is obtained, and used to derive an operator reduction rule which simplifies the 1/N expansion. The operator reduction rule is applied to the axial currents, masses, magnetic moments and hyperon non-leptonic decay amplitudes in the $SU(3)$ limit, to first order in $SU(3)$ breaking, and without assuming $SU(3)$ symmetry. The connection between the Skyrme and quark representations is discussed. An explicit formula is given for the quark model operators in terms of the Skyrme model operators to all orders in $1/\N$ for the two flavor case. |
1712.06844 | Andrea Tesi | Riccardo Barbieri, Andrea Tesi | B-decay anomalies in Pati-Salam SU(4) | 24 pages, 3 figures | null | 10.1140/epjc/s10052-018-5680-9 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Attempts to incorporate in a coherent picture the $B$-decay anomalies
presumably observed in $b\rightarrow c$ and $b\rightarrow s$ semi-leptonic
decays have to face the absence of signals in other related experiments, both
at low and at high energies. By extending and making more precise the content
of Ref. [1], we describe one such attempt based on the Pati-Salam SU(4) group,
that unifies colour and the $B$-$L$ charge, in the context of a new strongly
interacting sector, equally responsible for producing a pseudo-Goldstone Higgs
boson.
| [
{
"created": "Tue, 19 Dec 2017 09:51:19 GMT",
"version": "v1"
}
] | 2018-04-04 | [
[
"Barbieri",
"Riccardo",
""
],
[
"Tesi",
"Andrea",
""
]
] | Attempts to incorporate in a coherent picture the $B$-decay anomalies presumably observed in $b\rightarrow c$ and $b\rightarrow s$ semi-leptonic decays have to face the absence of signals in other related experiments, both at low and at high energies. By extending and making more precise the content of Ref. [1], we describe one such attempt based on the Pati-Salam SU(4) group, that unifies colour and the $B$-$L$ charge, in the context of a new strongly interacting sector, equally responsible for producing a pseudo-Goldstone Higgs boson. |
1401.4303 | Sergey Mikhailov | S. V. Mikhailov, A. V. Pimikov, N. G. Stefanis | Theoretical description and measurement of the pion-photon transition
form factor | 10 pages, 4 figures, 6 references added, minor style corrections,
Presented by the first author at the Light-Cone Conference 2013, May 20-24,
2013, Skiathos, Greece | null | 10.1007/s00601-014-0849-8 | RUB-TPII-04/2013 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Detailed predictions for the scaled pion-photon transition form factor are
given, derived with the method of light-cone sum rules and using pion
distribution amplitudes with two and three Gegenbauer coefficients obtained
from QCD sum rules with nonlocal condensates. These predictions agree well with
all experimental data that are compatible with QCD scaling (and collinear
factorization), but disagree with the high-$Q^2$ data of the BaBar
Collaboration that grow with the momentum. A good agreement of our predictions
with results obtained from AdS/QCD models and Dyson-Schwinger computations is
found.
| [
{
"created": "Fri, 17 Jan 2014 10:58:09 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Feb 2014 19:29:07 GMT",
"version": "v2"
}
] | 2014-03-03 | [
[
"Mikhailov",
"S. V.",
""
],
[
"Pimikov",
"A. V.",
""
],
[
"Stefanis",
"N. G.",
""
]
] | Detailed predictions for the scaled pion-photon transition form factor are given, derived with the method of light-cone sum rules and using pion distribution amplitudes with two and three Gegenbauer coefficients obtained from QCD sum rules with nonlocal condensates. These predictions agree well with all experimental data that are compatible with QCD scaling (and collinear factorization), but disagree with the high-$Q^2$ data of the BaBar Collaboration that grow with the momentum. A good agreement of our predictions with results obtained from AdS/QCD models and Dyson-Schwinger computations is found. |
hep-ph/0610293 | Thomas Heinzl | T. Heinzl | A novel approach to light-front perturbation theory | 10 pages, 5 figures | Phys.Rev.D75:025013,2007 | 10.1103/PhysRevD.75.025013 | null | hep-ph hep-th | null | We suggest a possible algorithm to calculate one-loop n-point functions
within a variant of light-front perturbation theory. The key ingredients are
the covariant Passarino-Veltman scheme and a surprising integration formula
that localises Feynman integrals at vanishing longitudinal momentum. The
resulting expressions are generalisations of Weinberg's infinite-momentum
results and are manifestly Lorentz invariant. For n = 2 and 3 we explicitly
show how to relate those to light-front integrals with standard energy
denominators. All expressions are rendered finite by means of transverse
dimensional regularisation.
| [
{
"created": "Mon, 23 Oct 2006 13:19:34 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Heinzl",
"T.",
""
]
] | We suggest a possible algorithm to calculate one-loop n-point functions within a variant of light-front perturbation theory. The key ingredients are the covariant Passarino-Veltman scheme and a surprising integration formula that localises Feynman integrals at vanishing longitudinal momentum. The resulting expressions are generalisations of Weinberg's infinite-momentum results and are manifestly Lorentz invariant. For n = 2 and 3 we explicitly show how to relate those to light-front integrals with standard energy denominators. All expressions are rendered finite by means of transverse dimensional regularisation. |
0810.1021 | Ping Wang | P. Wang, D. B. Leinweber, A. W. Thomas, R. D. Young | Chiral extrapolation of octet-baryon charge radii | 21 pages, 14 figures | Phys.Rev.D79:094001,2009 | 10.1103/PhysRevD.79.094001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The charge radii of octet-baryons obtained in quenched lattice-QCD
calculations are extrapolated within heavy-baryon chiral perturbation theory.
Finite-range regularization (FRR) is applied to improve the convergence of the
chiral expansion and to provide estimates of quenching artifacts. Lattice
values of quark distribution radii and baryon charge radii for $\mpi^2$ in the
range (0.1, 0.7)$\gev^2$ are described very well with FRR. Upon estimating
corrections for both finite-volume and quenching effects, the obtained charge
radii of the proton, neutron and $\Sigma^-$ are in good agreement with
experimental measurements. The predicted charge radii of the remaining
octet-baryons have not yet been measured and present a challenge to future
experiments.
| [
{
"created": "Mon, 6 Oct 2008 17:31:45 GMT",
"version": "v1"
},
{
"created": "Thu, 7 May 2009 16:24:18 GMT",
"version": "v2"
}
] | 2009-10-29 | [
[
"Wang",
"P.",
""
],
[
"Leinweber",
"D. B.",
""
],
[
"Thomas",
"A. W.",
""
],
[
"Young",
"R. D.",
""
]
] | The charge radii of octet-baryons obtained in quenched lattice-QCD calculations are extrapolated within heavy-baryon chiral perturbation theory. Finite-range regularization (FRR) is applied to improve the convergence of the chiral expansion and to provide estimates of quenching artifacts. Lattice values of quark distribution radii and baryon charge radii for $\mpi^2$ in the range (0.1, 0.7)$\gev^2$ are described very well with FRR. Upon estimating corrections for both finite-volume and quenching effects, the obtained charge radii of the proton, neutron and $\Sigma^-$ are in good agreement with experimental measurements. The predicted charge radii of the remaining octet-baryons have not yet been measured and present a challenge to future experiments. |
1604.03370 | York Schroder | Gionata Luisoni, Stanislav Poslavsky and York Schroder | Track 3: Computations in theoretical physics -- techniques and methods | 10 pages, 3 figures, to appear in the proceedings of ACAT 2016 | null | 10.1088/1742-6596/762/1/012077 | CERN-TH-2016-081 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Here, we attempt to summarize the activities of Track 3 of the 17th
International Workshop on Advanced Computing and Analysis Techniques in Physics
Research (ACAT 2016).
| [
{
"created": "Tue, 12 Apr 2016 12:30:12 GMT",
"version": "v1"
}
] | 2016-12-21 | [
[
"Luisoni",
"Gionata",
""
],
[
"Poslavsky",
"Stanislav",
""
],
[
"Schroder",
"York",
""
]
] | Here, we attempt to summarize the activities of Track 3 of the 17th International Workshop on Advanced Computing and Analysis Techniques in Physics Research (ACAT 2016). |
1210.5339 | Singh N.Nimai | Subhankar Roy and N. Nimai Singh | Expansion of $U_{PMNS}$ and Neutrino mass matrix $M_{\nu}$ in terms of
$sin\theta_{13}$ for Inverted Hierarchical case | 9 pages, 5 figures | null | 10.4236/jmp.2013.44070 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent observational data supports the deviation from Tri-bimaximal (TBM)
mixings. Different neutrino mass models suggest the interdependency among the
observational parameters involving the mixing angles. On phenomenological
ground we try to construct the PMNS matrix $U_{PMNS}$ with certain analytic
structure satisfying the unitary condition, in terms of a single observational
parameter $sin\theta_{13}$. We hypothesise the three neutrino masses $m_{i}$ as
functions of $sin\theta_{13}$ and then construct the neutrino mass matrix
$M_{\nu}$. We assume the convergence of the model to TBM mixing when
$\theta_{13}$ is taken zero. This mass matrix so far obtained can be employed
for various applications including the estimation of matter-antimatter
asymmetry of the Universe.
| [
{
"created": "Fri, 19 Oct 2012 08:14:58 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Roy",
"Subhankar",
""
],
[
"Singh",
"N. Nimai",
""
]
] | The recent observational data supports the deviation from Tri-bimaximal (TBM) mixings. Different neutrino mass models suggest the interdependency among the observational parameters involving the mixing angles. On phenomenological ground we try to construct the PMNS matrix $U_{PMNS}$ with certain analytic structure satisfying the unitary condition, in terms of a single observational parameter $sin\theta_{13}$. We hypothesise the three neutrino masses $m_{i}$ as functions of $sin\theta_{13}$ and then construct the neutrino mass matrix $M_{\nu}$. We assume the convergence of the model to TBM mixing when $\theta_{13}$ is taken zero. This mass matrix so far obtained can be employed for various applications including the estimation of matter-antimatter asymmetry of the Universe. |
hep-ph/0305186 | Roberto J. M. Covolan | R. J. M. Covolan and M. S. Soares | Diffractive production of dijets by double Pomeron exchange processes | 4 pages, REVTEX4.0 | Phys.Rev. D67 (2003) 077504 | 10.1103/PhysRevD.67.077504 | null | hep-ph | null | A phenomenological description of diffractive dijet hadroproduction via
double Pomeron exchange is presented. This description is based on a modified
version of the Ingelman-Schlein model which includes the evolution of the
Pomeron structure function and corrections regarding rapidity gap suppression
effects. The same quark-dominant Pomeron structure function employed in a
previous report to describe diffractive dijet and W production via single
Pomeron processes is shown here to yield results consistent with the available
data for double Pomeron processes as well.
| [
{
"created": "Fri, 16 May 2003 18:01:12 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Covolan",
"R. J. M.",
""
],
[
"Soares",
"M. S.",
""
]
] | A phenomenological description of diffractive dijet hadroproduction via double Pomeron exchange is presented. This description is based on a modified version of the Ingelman-Schlein model which includes the evolution of the Pomeron structure function and corrections regarding rapidity gap suppression effects. The same quark-dominant Pomeron structure function employed in a previous report to describe diffractive dijet and W production via single Pomeron processes is shown here to yield results consistent with the available data for double Pomeron processes as well. |
hep-ph/0304221 | Kordian A. Smolinski | P. Caban, J. Rembielinski, K. A. Smolinski, and Z. Walczak | Oscillations do not distinguish between massive and tachyonic neutrinos | 2 pages | Found.Phys.Lett. 19 (2006) 619-623 | null | null | hep-ph | null | It is shown that the hypothesis of tachyonic neutrinos leads to the same
oscillations effect as if they were usual massive particles. Therefore, the
experimental evidence of neutrino oscillations does not distinguish between
massive and tachyonic neutrinos.
| [
{
"created": "Wed, 23 Apr 2003 11:09:26 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Apr 2003 11:35:10 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Caban",
"P.",
""
],
[
"Rembielinski",
"J.",
""
],
[
"Smolinski",
"K. A.",
""
],
[
"Walczak",
"Z.",
""
]
] | It is shown that the hypothesis of tachyonic neutrinos leads to the same oscillations effect as if they were usual massive particles. Therefore, the experimental evidence of neutrino oscillations does not distinguish between massive and tachyonic neutrinos. |
hep-ph/9608252 | null | Siwen Wang (University of Maryland, Collge Park, MD USA) and Leonard
S. Kisslinger (Carnegie Mellon University, Pittsburgh, PA USA) | Pion Helicity Structure And Its Consequence For The Hard Scattering Form
Factor | 8 pages, Latex, 2 Postscript figures, uses epsf.sty. To appear in
Phys. Rev. D54, 10/1/96 | Phys.Rev. D54 (1996) 5890-5893 | 10.1103/PhysRevD.54.5890 | null | hep-ph | null | In a study of the elastic pion form factor for large momentum transfers based
on a modified perturbative QCD (PQCD) approach we have included helicity
components that are customarily neglected. Along with the inclusion of
transverse momentum, this gives a large suppression of the form factor from the
prediction of the original hard scattering model based on PQCD in the $Q^{2}$
domain where experimental data are available. We conclude that nonperturbative
contributions will dominate in this region.
| [
{
"created": "Wed, 7 Aug 1996 17:40:43 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Wang",
"Siwen",
"",
"University of Maryland, Collge Park, MD USA"
],
[
"Kisslinger",
"Leonard S.",
"",
"Carnegie Mellon University, Pittsburgh, PA USA"
]
] | In a study of the elastic pion form factor for large momentum transfers based on a modified perturbative QCD (PQCD) approach we have included helicity components that are customarily neglected. Along with the inclusion of transverse momentum, this gives a large suppression of the form factor from the prediction of the original hard scattering model based on PQCD in the $Q^{2}$ domain where experimental data are available. We conclude that nonperturbative contributions will dominate in this region. |
1811.10527 | Darren Scott | Benjamin D. Pecjak, Darren J. Scott, Xing Wang, Li Lin Yang | Resummation for rapidity distributions in top-quark pair production | 16 pages, 6 figures, 1 table | null | 10.1007/JHEP03(2019)060 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend our framework for the simultaneous resummation of soft and
small-mass logarithms to rapidity distributions in top quark pair production.
We give numerical results for the rapidity distribution of the top quark or the
anti-top quark, as well as the rapidity distribution of the $t\bar{t}$ pair,
finding that resummation effects stabilize the dependence of the differential
cross sections on the choice of factorization scale. We compare our results
with recent measurements at the Large Hadron Collider and find good agreement.
Our results may be useful in the extraction of the gluon parton distribution
function from $t\bar{t}$ production.
| [
{
"created": "Mon, 26 Nov 2018 17:34:57 GMT",
"version": "v1"
}
] | 2019-03-27 | [
[
"Pecjak",
"Benjamin D.",
""
],
[
"Scott",
"Darren J.",
""
],
[
"Wang",
"Xing",
""
],
[
"Yang",
"Li Lin",
""
]
] | We extend our framework for the simultaneous resummation of soft and small-mass logarithms to rapidity distributions in top quark pair production. We give numerical results for the rapidity distribution of the top quark or the anti-top quark, as well as the rapidity distribution of the $t\bar{t}$ pair, finding that resummation effects stabilize the dependence of the differential cross sections on the choice of factorization scale. We compare our results with recent measurements at the Large Hadron Collider and find good agreement. Our results may be useful in the extraction of the gluon parton distribution function from $t\bar{t}$ production. |
hep-ph/0701105 | Barbara Jager | G. Bozzi, B. Jager, C.Oleari, D.Zeppenfeld | Next-to-leading order QCD corrections to W+Z and W-Z production via
vector-boson fusion | 15 pages, 6 figures; new figure and comments added; version published
by PRD | Phys.Rev.D75:073004,2007 | 10.1103/PhysRevD.75.073004 | Bicocca-FT-07-1, KA-TP-01-2007, SFB-CPP-07-02 | hep-ph | null | We present the calculation of the next-to-leading order QCD corrections to
electroweak p p -> e+ nu_e mu+ mu- jj and p p -> e- nubar_e mu+ mu- jj
production at the CERN LHC in the form of a fully flexible parton-level Monte
Carlo program. The QCD corrections to the total cross sections are modest,
changing the leading-order results by less than 10%. At the Born level, the
shape of kinematic distributions can depend significantly on the choice of
factorization scale. This theoretical uncertainty is strongly reduced by the
inclusion of the next-to-leading order QCD corrections.
| [
{
"created": "Mon, 15 Jan 2007 00:11:44 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Apr 2007 02:02:13 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bozzi",
"G.",
""
],
[
"Jager",
"B.",
""
],
[
"Oleari",
"C.",
""
],
[
"Zeppenfeld",
"D.",
""
]
] | We present the calculation of the next-to-leading order QCD corrections to electroweak p p -> e+ nu_e mu+ mu- jj and p p -> e- nubar_e mu+ mu- jj production at the CERN LHC in the form of a fully flexible parton-level Monte Carlo program. The QCD corrections to the total cross sections are modest, changing the leading-order results by less than 10%. At the Born level, the shape of kinematic distributions can depend significantly on the choice of factorization scale. This theoretical uncertainty is strongly reduced by the inclusion of the next-to-leading order QCD corrections. |
1510.04485 | Kaori Fuyuto | Kaori Fuyuto, Junji Hisano, Eibun Senaha | Toward verification of electroweak baryogenesis by electric dipole
moments | 7 pages, 5 figures | null | 10.1016/j.physletb.2016.02.053 | IPMU15-0179 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study general aspects of the CP-violating effects on the baryon asymmetry
of the Universe (BAU) and electric dipole moments (EDMs) in models extended by
an extra Higgs doublet and a singlet, together with electroweak-interacting
fermions. In particular, the emphasis is on the structure of the CP-violating
interactions and dependences of the BAU and EDMs on masses of the relevant
particles. In a concrete mode, we investigate a relationship between the BAU
and the electron EDM for a typical parameter set. As long as the BAU-related CP
violation predominantly exists, the electron EDM has a strong power in probing
electroweak baryogenesis. However, once a BAU-unrelated CP violation comes into
play, the direct correlation between the BAU and electron EDM can be lost. Even
in such a case, we point out that verifiability of the scenario still remains
with the help of Higgs physics.
| [
{
"created": "Thu, 15 Oct 2015 12:02:37 GMT",
"version": "v1"
}
] | 2016-04-20 | [
[
"Fuyuto",
"Kaori",
""
],
[
"Hisano",
"Junji",
""
],
[
"Senaha",
"Eibun",
""
]
] | We study general aspects of the CP-violating effects on the baryon asymmetry of the Universe (BAU) and electric dipole moments (EDMs) in models extended by an extra Higgs doublet and a singlet, together with electroweak-interacting fermions. In particular, the emphasis is on the structure of the CP-violating interactions and dependences of the BAU and EDMs on masses of the relevant particles. In a concrete mode, we investigate a relationship between the BAU and the electron EDM for a typical parameter set. As long as the BAU-related CP violation predominantly exists, the electron EDM has a strong power in probing electroweak baryogenesis. However, once a BAU-unrelated CP violation comes into play, the direct correlation between the BAU and electron EDM can be lost. Even in such a case, we point out that verifiability of the scenario still remains with the help of Higgs physics. |
1504.00745 | Hyun Min Lee | Hyun Min Lee, Min-Seok Seo | Communication with SIMP dark mesons via Z'-portal | 16 pages, 6 figures, To appear in Phys. Lett. B | null | 10.1016/j.physletb.2015.07.013 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a consistent extension of the SIMP models with dark mesons by
including a dark U(1)_D gauge symmetry. Dark matter density is determined by a
thermal freeze-out of the $3\to2$ self-annihilation process, thanks to the
Wess-Zumino-Witten term. In the presence of a gauge kinetic mixing between the
dark photon and the SM hypercharge gauge boson, dark mesons can undergo a
sufficient scattering off the Standard Model particles and keep in kinetic
equilibrium until freeze-out in this SIMP scenario. Taking the
SU(N_f)xSU(N_f)/SU(N_f) flavor symmetry under the SU(N_c) confining group, we
show how much complementary the SIMP constraints on the parameters of the dark
photon are for current experimental searches for dark photon.
| [
{
"created": "Fri, 3 Apr 2015 05:22:29 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jul 2015 01:40:45 GMT",
"version": "v2"
}
] | 2015-07-29 | [
[
"Lee",
"Hyun Min",
""
],
[
"Seo",
"Min-Seok",
""
]
] | We consider a consistent extension of the SIMP models with dark mesons by including a dark U(1)_D gauge symmetry. Dark matter density is determined by a thermal freeze-out of the $3\to2$ self-annihilation process, thanks to the Wess-Zumino-Witten term. In the presence of a gauge kinetic mixing between the dark photon and the SM hypercharge gauge boson, dark mesons can undergo a sufficient scattering off the Standard Model particles and keep in kinetic equilibrium until freeze-out in this SIMP scenario. Taking the SU(N_f)xSU(N_f)/SU(N_f) flavor symmetry under the SU(N_c) confining group, we show how much complementary the SIMP constraints on the parameters of the dark photon are for current experimental searches for dark photon. |
1206.1189 | I. Sentitemsu Imsong Mr | I. Sentitemsu Imsong, B.Ananthanarayan, Irinel Caprini | Bounds on the spacelike pion electromagnetic form factor from
analyticity and unitarity | 6 pages, using PoS style files, 2 figures; talk given at QNP 2012,
Palaiseau, France, April 16-20, 2012 | PoS(QNP2012)130 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the recently measured accurate BaBaR data on the modulus of the pion
electromagnetic form factor, $F_\pi(t)$, up to an energy of 3 GeV, the I=1
$P$-wave phase of the $\pi\pi$ scattering amplitude up to the $\omega-\pi$
threshold, the pion charge radius known from Chiral Perturbation Theory, and
the recently measured JLAB value of $F_\pi$ in the spacelike region at $t=-2.45
{\rm GeV}^2$ as inputs in a formalism that leads to bounds on $F_\pi$ in the
intermediate spacelike region. We compare our constraints with experimental
data and with perturbative QCD along with the results of several theoretical
models for the non-perturbative contributions proposed in the literature.
| [
{
"created": "Wed, 6 Jun 2012 11:39:31 GMT",
"version": "v1"
}
] | 2012-06-20 | [
[
"Imsong",
"I. Sentitemsu",
""
],
[
"Ananthanarayan",
"B.",
""
],
[
"Caprini",
"Irinel",
""
]
] | We use the recently measured accurate BaBaR data on the modulus of the pion electromagnetic form factor, $F_\pi(t)$, up to an energy of 3 GeV, the I=1 $P$-wave phase of the $\pi\pi$ scattering amplitude up to the $\omega-\pi$ threshold, the pion charge radius known from Chiral Perturbation Theory, and the recently measured JLAB value of $F_\pi$ in the spacelike region at $t=-2.45 {\rm GeV}^2$ as inputs in a formalism that leads to bounds on $F_\pi$ in the intermediate spacelike region. We compare our constraints with experimental data and with perturbative QCD along with the results of several theoretical models for the non-perturbative contributions proposed in the literature. |
1003.0014 | Kathryn Zurek | A. Liam Fitzpatrick, Dan Hooper, and Kathryn M. Zurek | Implications of CoGeNT and DAMA for Light WIMP Dark Matter | 16 pages, 14 figures. v2: references added, fig 4 and surrounding
discussion modified. | Phys.Rev.D81:115005,2010 | 10.1103/PhysRevD.81.115005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the recent excess of low energy events observed by
the CoGeNT collaboration, and discuss the possibility that these events
originate from the elastic scattering of a light (m_DM ~ 5-10 GeV) dark matter
particle. We find that such a dark matter candidate may also be capable of
generating the annual modulation reported by DAMA, as well as the small excess
recently reported by CDMS, without conflicting with the null results from other
experiments, such as XENON10. A dark matter interpretation of the CoGeNT and
DAMA observations favors a region of parameter space that is especially
attractive within the context of Asymmetric Dark Matter models. In such models,
the cosmological dark matter density arises from the baryon asymmetry of the
universe, naturally leading to the expectation that m_DM ~ 1-10 GeV. We also
discuss neutralino dark matter from extended supersymmetric frameworks, such as
the NMSSM. Lastly, we explore the implications of such a dark matter candidate
for indirect searches, and find that the prospects for detecting the neutrino
and gamma ray annihilation products of such a particle to be very encouraging.
| [
{
"created": "Mon, 1 Mar 2010 19:29:31 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Apr 2010 17:16:52 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Fitzpatrick",
"A. Liam",
""
],
[
"Hooper",
"Dan",
""
],
[
"Zurek",
"Kathryn M.",
""
]
] | In this paper, we study the recent excess of low energy events observed by the CoGeNT collaboration, and discuss the possibility that these events originate from the elastic scattering of a light (m_DM ~ 5-10 GeV) dark matter particle. We find that such a dark matter candidate may also be capable of generating the annual modulation reported by DAMA, as well as the small excess recently reported by CDMS, without conflicting with the null results from other experiments, such as XENON10. A dark matter interpretation of the CoGeNT and DAMA observations favors a region of parameter space that is especially attractive within the context of Asymmetric Dark Matter models. In such models, the cosmological dark matter density arises from the baryon asymmetry of the universe, naturally leading to the expectation that m_DM ~ 1-10 GeV. We also discuss neutralino dark matter from extended supersymmetric frameworks, such as the NMSSM. Lastly, we explore the implications of such a dark matter candidate for indirect searches, and find that the prospects for detecting the neutrino and gamma ray annihilation products of such a particle to be very encouraging. |
1309.2746 | Mikhail Vysotsky | A.D. Dolgov, V.A. Novikov, M.I. Vysotsky | How to see an antistar | Comment about the experimental measurement of the circular
polarization of emitted in nuclear transitions photons added; variant to be
published in JETP Letters | null | 10.1134/S0021364013220037 | null | hep-ph astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Polarization of photons emitted in weak decays occuring at distant star
allows to determine whether this star is made from antimatter. Even more
promissing is the observation of neutrinos (antineutrinos) produced at
neutronization (antineutronization) reactions at the beginning of SN
($\bar{SN}$) explosion.
| [
{
"created": "Wed, 11 Sep 2013 07:30:07 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Oct 2013 15:12:29 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Dolgov",
"A. D.",
""
],
[
"Novikov",
"V. A.",
""
],
[
"Vysotsky",
"M. I.",
""
]
] | Polarization of photons emitted in weak decays occuring at distant star allows to determine whether this star is made from antimatter. Even more promissing is the observation of neutrinos (antineutrinos) produced at neutronization (antineutronization) reactions at the beginning of SN ($\bar{SN}$) explosion. |
1312.6860 | Gilberto Tavares-Velasco | A. Bola\~nos, A. Moyotl, G.Tavares-Velasco | Static weak dipole moments of the $\tau$ lepton via renormalizable
scalar leptoquark interactions | Revised version including changes in the numerical analysis and
several new figures, minor typos corrected | Phys. Rev. D89 (2014) 055025 | 10.1103/PhysRevD.89.055025 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The weak dipole moments of elementary fermions are calculated at the one-loop
level in the framework of a renormalizable scalar leptoquark model that forbids
baryon number violating processes and so is free from the strong constraints
from experimental data. In this model there are two scalar leptoquarks
accommodated in an $SU_L(2)\times U_Y(1)$ doublet: one of such leptoquarks is
non-chiral and has electric charge of $5/3e$, whereas the other one is chiral
and has electric charge $2/3e$. In particular, a non-chiral leptoquark
contributes to the weak properties of an up fermion via a chirality
flipping-term proportional to the mass of the virtual fermion and can also
induce a non-zero weak electric dipole moment provided that the leptoquark
couplings are complex. The numerical analysis is focused on the weak properties
of the $\tau$ lepton since they offer good prospects for their experimental
study. The constraints on leptoquark couplings are briefly discussed for a
non-chiral leptoquark with non diagonal couplings to the second and third
fermion generations, a third-generation non-chiral leptoquark, and a
third-generation chiral leptoquark. It is found that although the
chirality-flipping term can enhance the weak properties of the $\tau$ lepton
via the top quark contribution, such an enhancement would be offset by the
strong constraints on the leptoquark couplings. So, the contribution of scalar
leptoquarks to the weak magnetic dipole moment of the $\tau$ lepton are smaller
than the standard model (SM) contributions but can be of similar size than
those arising in some SM extensions. A non-chiral leptoquark can also give
contributions to the weak electric dipole moment larger than the SM one but
well below the experimental limit. We also discuss the case of the off-shell
weak dipole moments and for completeness analyze the behavior of the $\tau$
electromagnetic properties.
| [
{
"created": "Tue, 24 Dec 2013 17:58:23 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Dec 2013 22:33:12 GMT",
"version": "v2"
},
{
"created": "Sun, 16 Feb 2014 19:50:53 GMT",
"version": "v3"
}
] | 2014-03-26 | [
[
"Bolaños",
"A.",
""
],
[
"Moyotl",
"A.",
""
],
[
"Tavares-Velasco",
"G.",
""
]
] | The weak dipole moments of elementary fermions are calculated at the one-loop level in the framework of a renormalizable scalar leptoquark model that forbids baryon number violating processes and so is free from the strong constraints from experimental data. In this model there are two scalar leptoquarks accommodated in an $SU_L(2)\times U_Y(1)$ doublet: one of such leptoquarks is non-chiral and has electric charge of $5/3e$, whereas the other one is chiral and has electric charge $2/3e$. In particular, a non-chiral leptoquark contributes to the weak properties of an up fermion via a chirality flipping-term proportional to the mass of the virtual fermion and can also induce a non-zero weak electric dipole moment provided that the leptoquark couplings are complex. The numerical analysis is focused on the weak properties of the $\tau$ lepton since they offer good prospects for their experimental study. The constraints on leptoquark couplings are briefly discussed for a non-chiral leptoquark with non diagonal couplings to the second and third fermion generations, a third-generation non-chiral leptoquark, and a third-generation chiral leptoquark. It is found that although the chirality-flipping term can enhance the weak properties of the $\tau$ lepton via the top quark contribution, such an enhancement would be offset by the strong constraints on the leptoquark couplings. So, the contribution of scalar leptoquarks to the weak magnetic dipole moment of the $\tau$ lepton are smaller than the standard model (SM) contributions but can be of similar size than those arising in some SM extensions. A non-chiral leptoquark can also give contributions to the weak electric dipole moment larger than the SM one but well below the experimental limit. We also discuss the case of the off-shell weak dipole moments and for completeness analyze the behavior of the $\tau$ electromagnetic properties. |
hep-ph/0511330 | Alexander Studenikin | Alexander Grigoriev, Alexander Studenikin, Alexei Ternov | Dirac and Majorana neutrinos in matter | 11 pages, 2 figures, in: Proceedings of the 5th International
Conference on Non-Accelerator New Physics (Dubna, Russia, June 20-25, 2005).
V2: typos corrected | Phys.Atom.Nucl.69:1940-1945,2006 | 10.1134/S1063778806110196 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the matter effects on neutrinos moving in background on the basis
of the corresponding quantum wave equations. Both Dirac and Majorana neutrino
cases are discussed. The effects for Dirac neutrino reflection and trapping as
well as neutrino-antineutrino annihilation and $\nu\overline{\nu}$ pair
creation in matter at the interface between two media with different densities
are considered. The spin light of neutrino in matter is also discussed.
| [
{
"created": "Tue, 29 Nov 2005 16:48:35 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Sep 2008 14:38:15 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Grigoriev",
"Alexander",
""
],
[
"Studenikin",
"Alexander",
""
],
[
"Ternov",
"Alexei",
""
]
] | We consider the matter effects on neutrinos moving in background on the basis of the corresponding quantum wave equations. Both Dirac and Majorana neutrino cases are discussed. The effects for Dirac neutrino reflection and trapping as well as neutrino-antineutrino annihilation and $\nu\overline{\nu}$ pair creation in matter at the interface between two media with different densities are considered. The spin light of neutrino in matter is also discussed. |
1110.6074 | Bachir Moussallam | B. Moussallam | Couplings of light I=0 scalar mesons to simple operators in the complex
plane | 31 pages, 5 figures | null | 10.1140/epjc/s10052-011-1814-z | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The flavour and glue structure of the light scalar mesons in QCD are probed
by studying the couplings of the I=0 mesons $\sigma(600)$ and $f_0(980)$ to the
operators $\bar{q}q$, $\alpha_s G^2$ and to two photons. The Roy dispersive
representation for the $\pi\pi$ amplitude $t_0^0(s)$ is used to determine the
pole positions as well as the residues in the complex plane. On the real axis,
$t_0^0$ is constrained to solve the Roy equation together with elastic
unitarity up to the $K\Kbar$ threshold leading to an improved description of
the $f_0(980)$. The problem of using a two-particle threshold as a matching
point is discussed. A simple relation is established between the coupling of a
scalar meson to an operator $j_S$ and the value of the related pion form-factor
computed at the resonance pole. Pion scalar form-factors as well as two-photon
partial-wave amplitudes are expressed as coupled-channel Omn\`es dispersive
representations. Subtraction constants are constrained by chiral symmetry and
experimental data. Comparison of our results for the $\bar{q}q$ couplings with
earlier determinations of the analogous couplings of the lightest I=1 and
$I=1/2$ scalar mesons are compatible with an assignment of the $\sigma$,
$\kappa$, $a_0(980)$, $f_0(980)$ into a nonet. Concerning the gluonic operator
$\alpha_s G^2$ we find a significant coupling to both the $\sigma$ and the
$f_0(980)$.
| [
{
"created": "Thu, 27 Oct 2011 13:18:55 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Moussallam",
"B.",
""
]
] | The flavour and glue structure of the light scalar mesons in QCD are probed by studying the couplings of the I=0 mesons $\sigma(600)$ and $f_0(980)$ to the operators $\bar{q}q$, $\alpha_s G^2$ and to two photons. The Roy dispersive representation for the $\pi\pi$ amplitude $t_0^0(s)$ is used to determine the pole positions as well as the residues in the complex plane. On the real axis, $t_0^0$ is constrained to solve the Roy equation together with elastic unitarity up to the $K\Kbar$ threshold leading to an improved description of the $f_0(980)$. The problem of using a two-particle threshold as a matching point is discussed. A simple relation is established between the coupling of a scalar meson to an operator $j_S$ and the value of the related pion form-factor computed at the resonance pole. Pion scalar form-factors as well as two-photon partial-wave amplitudes are expressed as coupled-channel Omn\`es dispersive representations. Subtraction constants are constrained by chiral symmetry and experimental data. Comparison of our results for the $\bar{q}q$ couplings with earlier determinations of the analogous couplings of the lightest I=1 and $I=1/2$ scalar mesons are compatible with an assignment of the $\sigma$, $\kappa$, $a_0(980)$, $f_0(980)$ into a nonet. Concerning the gluonic operator $\alpha_s G^2$ we find a significant coupling to both the $\sigma$ and the $f_0(980)$. |
hep-ph/0406153 | Jean-Marc Laget | J.M. Laget | The space-time structure of hard scattering processes | 4 pages; 5 figures | Phys.Rev.D70:054023,2004 | 10.1103/PhysRevD.70.054023 | null | hep-ph | null | Recent studies of exclusive electroproduction of vector mesons at JLab make
it possible for the first time to play with two independent hard scales: the
virtuality Q^2 of the photon, which sets the observation scale, and the
momentum transfer t to the hadronic system, which sets the interaction scale.
They reinforce the description of hard scattering processes in terms of few
effective degrees of freedom relevant to the Jlab-Hermes energy range.
| [
{
"created": "Mon, 14 Jun 2004 21:45:12 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Laget",
"J. M.",
""
]
] | Recent studies of exclusive electroproduction of vector mesons at JLab make it possible for the first time to play with two independent hard scales: the virtuality Q^2 of the photon, which sets the observation scale, and the momentum transfer t to the hadronic system, which sets the interaction scale. They reinforce the description of hard scattering processes in terms of few effective degrees of freedom relevant to the Jlab-Hermes energy range. |
1801.10232 | Sarka Todorova PhD | Sharka Todorova-Nova | Modeling of quantum effects in the hadronization | 9 pages, 13 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recent observation of a threshold momentum difference in the production of
adjacent hadrons is implemented in the fragmentation model of a
three-dimensional QCD string, with the aim to investigate the common origin of
the azimuthal ordering of hadrons and of the correlations commonly attributed
to the Bose-Einstein effect. The role of particle decays and their polarization
in the measurement of two-particle correlations is evaluated. A comparison with
the available data is presented and further measurements suggested. The impact
of the hadronization on the long range angular correlations is discussed.
| [
{
"created": "Tue, 30 Jan 2018 21:44:58 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Oct 2021 22:58:25 GMT",
"version": "v2"
}
] | 2021-10-27 | [
[
"Todorova-Nova",
"Sharka",
""
]
] | A recent observation of a threshold momentum difference in the production of adjacent hadrons is implemented in the fragmentation model of a three-dimensional QCD string, with the aim to investigate the common origin of the azimuthal ordering of hadrons and of the correlations commonly attributed to the Bose-Einstein effect. The role of particle decays and their polarization in the measurement of two-particle correlations is evaluated. A comparison with the available data is presented and further measurements suggested. The impact of the hadronization on the long range angular correlations is discussed. |
hep-ph/9302204 | null | Harry. J. Lipkin | Physics at B-Factories | 19 pages, WIS-93/12/Jan-PH (A Theoretical Talk) | null | null | null | hep-ph | null | The main motivation for B factories is the investigation of CP violation. We
consider two questions: 1) Why has there been essentially no experimental
progress in CP violation in the 28 years since its discovery in 1964? 2) Why do
we expect better results from B factories?
| [
{
"created": "Tue, 2 Feb 1993 17:45:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lipkin",
"Harry. J.",
""
]
] | The main motivation for B factories is the investigation of CP violation. We consider two questions: 1) Why has there been essentially no experimental progress in CP violation in the 28 years since its discovery in 1964? 2) Why do we expect better results from B factories? |
hep-ph/0408012 | Yutaka Hosotani | Yutaka Hosotani | Dynamical Gauge-Higgs Unification | 16 pages, 3 figures. Contribution paper for ICHEP 2004 | null | null | OU-HET 477/2004 | hep-ph | null | Gauge fields and both adjoint and fundamental Higgs fields are unified in
gauge theory defined on an orbifold. It is shown how the Hosotani mechanism at
the quantum level resolves the problem of the arbitrariness in boundary
conditions imposed at the fixed points of the orbifold. The role of adjoint
Higgs fields in the standard GUT, which are extra-dimensional components of
gauge fields in the current scheme, is taken by the Hosotani mechanism and
additional dynamics governing the selection of equivalence classes of boundary
conditions. The roles of fundamental Higgs fields, namely those of inducing the
electroweak symmetry breaking and giving masses to quarks and leptons, are
taken by the Hosotani mechanism and by extra twists in boundary conditions for
matter. SUSY scenario nicely fits this scheme. Explicit models are given for
the gauge groups U(3) x U(3), SU(5), and SU(6) on the orbifolds M^4 x (S^1/Z_2)
and M^4 x (T^2/Z_2).
| [
{
"created": "Mon, 2 Aug 2004 02:48:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hosotani",
"Yutaka",
""
]
] | Gauge fields and both adjoint and fundamental Higgs fields are unified in gauge theory defined on an orbifold. It is shown how the Hosotani mechanism at the quantum level resolves the problem of the arbitrariness in boundary conditions imposed at the fixed points of the orbifold. The role of adjoint Higgs fields in the standard GUT, which are extra-dimensional components of gauge fields in the current scheme, is taken by the Hosotani mechanism and additional dynamics governing the selection of equivalence classes of boundary conditions. The roles of fundamental Higgs fields, namely those of inducing the electroweak symmetry breaking and giving masses to quarks and leptons, are taken by the Hosotani mechanism and by extra twists in boundary conditions for matter. SUSY scenario nicely fits this scheme. Explicit models are given for the gauge groups U(3) x U(3), SU(5), and SU(6) on the orbifolds M^4 x (S^1/Z_2) and M^4 x (T^2/Z_2). |
1408.0663 | Thomas Hahn | M.E. G\'omez, T. Hahn, S. Heinemeyer, M. Rehman | Higgs masses and Electroweak Precision Observables in the
Lepton-Flavor-Violating MSSM | LaTeX, 30 pages | Phys. Rev. D 90, 074016 (2014) | 10.1103/PhysRevD.90.074016 | MPP-2014-321 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effects of Lepton Flavor Violation (LFV) in the scalar lepton
sector of the MSSM on precision observables such as the W-boson mass and the
effective weak leptonic mixing angle, and on the Higgs-boson mass predictions.
The slepton mass matrices are parameterized in a model-independent way by a
complete set of dimensionless parameters which we constrain through LFV decay
processes and the precision observables. We find regions where both conditions
are similarly constraining. The necessary prerequisites for the calculation
have been added to FeynArts and FormCalc and are thus publicly available for
further studies. The obtained results are available in FeynHiggs.
| [
{
"created": "Mon, 4 Aug 2014 12:55:22 GMT",
"version": "v1"
}
] | 2024-07-02 | [
[
"Gómez",
"M. E.",
""
],
[
"Hahn",
"T.",
""
],
[
"Heinemeyer",
"S.",
""
],
[
"Rehman",
"M.",
""
]
] | We study the effects of Lepton Flavor Violation (LFV) in the scalar lepton sector of the MSSM on precision observables such as the W-boson mass and the effective weak leptonic mixing angle, and on the Higgs-boson mass predictions. The slepton mass matrices are parameterized in a model-independent way by a complete set of dimensionless parameters which we constrain through LFV decay processes and the precision observables. We find regions where both conditions are similarly constraining. The necessary prerequisites for the calculation have been added to FeynArts and FormCalc and are thus publicly available for further studies. The obtained results are available in FeynHiggs. |
hep-ph/9512257 | Hans-Christian Pauli | Hans-Christian Pauli and J"org Merkel (Max-Planck-Institut f"ur
Kernphysik) | On the Masses of the Physical Mesons: Solving the Effective
QCD--Hamiltonian by DLCQ | 28 pages; 1 Latex file & 3 Postscript files; tarred, compressed and
uuencoded with `uufiles' | null | null | MPIH-V45-1995 | hep-ph | null | The effective QCD-interaction as obtained from the front form Hamiltonian by
DLCQ is Fourier transformed on the Retarded Schr\"odinger Equation for to
describe the constituents of physical mesons. The crucial point is the use of a
running coupling constant $\alpha_s(Q^2)$, in a manner similar but not equal to
the one of Richardson in the equal usual-time quantization. Fixing the running
coupling constant at the Z mass, the only parameters are the flavor masses.
Without the top quark one needs thus 5 parameters to calculate the physical
masses of 30 pseudoscalar and vector mesons, consistently within the same
model. Applying variational methods to a caricature of the model, the biggest
technical challenge is the solution of a cubic algebraic equation. -- In view
of an oversimplified model and a very simple technology, the agreement with the
empirical data is much too good.
| [
{
"created": "Thu, 7 Dec 1995 15:33:17 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pauli",
"Hans-Christian",
"",
"Max-Planck-Institut f\"ur\n Kernphysik"
],
[
"Merkel",
"J\"org",
"",
"Max-Planck-Institut f\"ur\n Kernphysik"
]
] | The effective QCD-interaction as obtained from the front form Hamiltonian by DLCQ is Fourier transformed on the Retarded Schr\"odinger Equation for to describe the constituents of physical mesons. The crucial point is the use of a running coupling constant $\alpha_s(Q^2)$, in a manner similar but not equal to the one of Richardson in the equal usual-time quantization. Fixing the running coupling constant at the Z mass, the only parameters are the flavor masses. Without the top quark one needs thus 5 parameters to calculate the physical masses of 30 pseudoscalar and vector mesons, consistently within the same model. Applying variational methods to a caricature of the model, the biggest technical challenge is the solution of a cubic algebraic equation. -- In view of an oversimplified model and a very simple technology, the agreement with the empirical data is much too good. |
0708.4302 | Vladimir Shevchenko | V.D.Orlovsky, V.I.Shevchenko | On the photon polarization in radiative B -> phi K gamma decay | RevTeX, 6 pages, 1 figure; the journal version | Phys.Rev.D77:093003,2008 | 10.1103/PhysRevD.77.093003 | null | hep-ph | null | The photon polarization in radiative decays B -> Y gamma is known to be a
subtle probe of the effective Lagrangian structure and possible New Physics
effects. We discuss exclusive decay mode B -> phi K gamma where the
experimentally distinct final state makes analysis especially promising. The
possibility to extract information on the photon polarization out of the data
entirely depends on the partial waves interference pattern in the phi K system.
| [
{
"created": "Fri, 31 Aug 2007 09:19:14 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Apr 2008 11:58:35 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Orlovsky",
"V. D.",
""
],
[
"Shevchenko",
"V. I.",
""
]
] | The photon polarization in radiative decays B -> Y gamma is known to be a subtle probe of the effective Lagrangian structure and possible New Physics effects. We discuss exclusive decay mode B -> phi K gamma where the experimentally distinct final state makes analysis especially promising. The possibility to extract information on the photon polarization out of the data entirely depends on the partial waves interference pattern in the phi K system. |
hep-ph/9709504 | Jean-Francois Grivaz | J.-F. Grivaz | Moriond '97 - Electroweak Interactions and Unified Theories - Conference
Summary | 19 pages, Latex, 4 figures included, to appear in the proceedings | null | null | LAL 97-60 | hep-ph | null | A brief summary of the experimental results presented at the conference is
given.
| [
{
"created": "Tue, 30 Sep 1997 13:32:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Grivaz",
"J. -F.",
""
]
] | A brief summary of the experimental results presented at the conference is given. |
hep-ph/0605207 | Cosmin Macesanu | Ilia Gogoladze, Cosmin Macesanu | Precision electroweak constraints on Universal Extra Dimensions
revisited | 15 pages, 4 eps figures, uses revtex4 | Phys.Rev.D74:093012,2006 | 10.1103/PhysRevD.74.093012 | null | hep-ph | null | We reconsider the constraints on Universal Extra Dimensions (UED) models
arising from precision electroweak data. We take into account the subleading
contributions from new physics (expressed in terms of the X,Y ... variables),
as well as two loop corrections to the Standard Model rho parameter. For the
case of one extra dimension, we obtain a lower bound on the inverse
compactification scale M = R^{-1} of 600 GeV (at 90% confidence level), with a
Higgs mass of 115 GeV. However, in contradiction to recent claims, we find that
this constraint is significantly relaxed with increasing Higgs mass, allowing
for compactification scales as low as 300 GeV. LEP II data does not
significantly affect these results.
| [
{
"created": "Thu, 18 May 2006 16:40:51 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Gogoladze",
"Ilia",
""
],
[
"Macesanu",
"Cosmin",
""
]
] | We reconsider the constraints on Universal Extra Dimensions (UED) models arising from precision electroweak data. We take into account the subleading contributions from new physics (expressed in terms of the X,Y ... variables), as well as two loop corrections to the Standard Model rho parameter. For the case of one extra dimension, we obtain a lower bound on the inverse compactification scale M = R^{-1} of 600 GeV (at 90% confidence level), with a Higgs mass of 115 GeV. However, in contradiction to recent claims, we find that this constraint is significantly relaxed with increasing Higgs mass, allowing for compactification scales as low as 300 GeV. LEP II data does not significantly affect these results. |
1508.05060 | Michael Trott | Laure Berthier and Michael Trott | Consistent constraints on the Standard Model Effective Field Theory | 23 pages, + 19 page appendix, 9 figures, Acknowledgement updated with
grant numbers, see comment added | null | 10.1007/JHEP02(2016)069 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop the global constraint picture in the (linear) effective field
theory generalisation of the Standard Model, incorporating data from detectors
that operated at PEP, PETRA, TRISTAN, SpS, Tevatron, SLAC, LEPI and LEP II, as
well as low energy precision data. We fit one hundred and three observables. We
develop a theory error metric for this effective field theory, which is
required when constraints on parameters at leading order in the power counting
are to be pushed to the percent level, or beyond, unless the cut off scale is
assumed to be large, $\Lambda \gtrsim \, 3 \, {\rm TeV}$. We more consistently
incorporate theoretical errors in this work, avoiding this assumption, and as a
direct consequence bounds on some leading parameters are relaxed. We show how
an $\rm S,T$ analysis is modified by the theory errors we include as an
illustrative example.
| [
{
"created": "Thu, 20 Aug 2015 18:05:05 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Oct 2015 16:56:03 GMT",
"version": "v2"
},
{
"created": "Tue, 27 Oct 2015 18:45:06 GMT",
"version": "v3"
},
{
"created": "Tue, 21 Jun 2016 10:30:09 GMT",
"version": "v4"
},
{
"created": "Fri, 14 Jul 2017 20:27:31 GMT",
"version": "v5"
}
] | 2017-07-18 | [
[
"Berthier",
"Laure",
""
],
[
"Trott",
"Michael",
""
]
] | We develop the global constraint picture in the (linear) effective field theory generalisation of the Standard Model, incorporating data from detectors that operated at PEP, PETRA, TRISTAN, SpS, Tevatron, SLAC, LEPI and LEP II, as well as low energy precision data. We fit one hundred and three observables. We develop a theory error metric for this effective field theory, which is required when constraints on parameters at leading order in the power counting are to be pushed to the percent level, or beyond, unless the cut off scale is assumed to be large, $\Lambda \gtrsim \, 3 \, {\rm TeV}$. We more consistently incorporate theoretical errors in this work, avoiding this assumption, and as a direct consequence bounds on some leading parameters are relaxed. We show how an $\rm S,T$ analysis is modified by the theory errors we include as an illustrative example. |
1501.03940 | Helmut Satz | Helmut Satz | Quarkonium Binding and Entropic Force | 11 pages, 8 figures | null | 10.1140/epjc/s10052-015-3424-7 | BI-TP 2015/04 | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A Q-Qbar bound state represents a balance between repulsive kinetic and
attractive potential energy. In a hot quark-gluon plasma, the interaction
potential experiences medium effects. Color screening modifies the attractive
binding force between the quarks, while the increase of entropy with Q-Qbar
separation gives rise to a growing repulsion. We study the role of these
phenomena for in-medium Q-Qbar binding and dissociation. It is found that the
relevant potential for Q-Qbar binding is the free energy F; with increasing
Q-Qbar separation, further binding through the internal energy U is compensated
by repulsive entropic effects.
| [
{
"created": "Fri, 16 Jan 2015 10:33:47 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Jan 2015 14:48:03 GMT",
"version": "v2"
}
] | 2015-05-20 | [
[
"Satz",
"Helmut",
""
]
] | A Q-Qbar bound state represents a balance between repulsive kinetic and attractive potential energy. In a hot quark-gluon plasma, the interaction potential experiences medium effects. Color screening modifies the attractive binding force between the quarks, while the increase of entropy with Q-Qbar separation gives rise to a growing repulsion. We study the role of these phenomena for in-medium Q-Qbar binding and dissociation. It is found that the relevant potential for Q-Qbar binding is the free energy F; with increasing Q-Qbar separation, further binding through the internal energy U is compensated by repulsive entropic effects. |
2102.10946 | Xuanmin Cao | Xuanmin Cao, Songyu Qiu, Hui Liu and Danning Li | Thermal properties of light mesons from holography | 32 pages, 10 figures | null | 10.1007/JHEP08(2021)005 | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | The thermal properties of light mesons, including the temperature dependence
of their masses (both screening and pole masses) and thermal widths, are
studied in a two-flavor ($N_f=2$) soft-wall AdS/QCD model. By solving the
spatial correlation functions, we extract the screening masses ($m_{\rm{scr}}$)
from their poles. The screening masses of pseudo-scalar ($\pi$) and
axial-vector ($a_1$) mesons increase almost monotonously with the increase of
temperature. The screening masses of scalar ($\sigma$) and vector ($\rho$)
mesons decrease at low temperature and increase at high temperature. The pole
masses ($m_{\rm{pole}}$) and the thermal widths ($\Gamma$) are extracted from
the temporal correlation functions and the corresponding spectral functions.
The results indicate that the pole masses have local minima at low temperature
and increase at high temperature. The thermal widths increase rapidly above the
chiral crossover temperature $T_{cp}$, indicating the dissociations of mesons
at high temperature. Furthermore, the degeneration of the chiral partners
($\pi$ and $\sigma$, $\rho$ and $a_1$) above $T_{cp}$ is observed from the
screening and pole masses, revealing the chiral symmetry restoration at the
hadronic spectrum level. Finally, we numerically verify that the spectral
functions in the temporal regime are strongly related to the quasi-normal modes
with complex frequencies $\omega_0=m_{\rm{pole}}-i \Gamma/2$.
| [
{
"created": "Mon, 22 Feb 2021 12:28:03 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Jul 2021 06:23:51 GMT",
"version": "v2"
}
] | 2021-09-01 | [
[
"Cao",
"Xuanmin",
""
],
[
"Qiu",
"Songyu",
""
],
[
"Liu",
"Hui",
""
],
[
"Li",
"Danning",
""
]
] | The thermal properties of light mesons, including the temperature dependence of their masses (both screening and pole masses) and thermal widths, are studied in a two-flavor ($N_f=2$) soft-wall AdS/QCD model. By solving the spatial correlation functions, we extract the screening masses ($m_{\rm{scr}}$) from their poles. The screening masses of pseudo-scalar ($\pi$) and axial-vector ($a_1$) mesons increase almost monotonously with the increase of temperature. The screening masses of scalar ($\sigma$) and vector ($\rho$) mesons decrease at low temperature and increase at high temperature. The pole masses ($m_{\rm{pole}}$) and the thermal widths ($\Gamma$) are extracted from the temporal correlation functions and the corresponding spectral functions. The results indicate that the pole masses have local minima at low temperature and increase at high temperature. The thermal widths increase rapidly above the chiral crossover temperature $T_{cp}$, indicating the dissociations of mesons at high temperature. Furthermore, the degeneration of the chiral partners ($\pi$ and $\sigma$, $\rho$ and $a_1$) above $T_{cp}$ is observed from the screening and pole masses, revealing the chiral symmetry restoration at the hadronic spectrum level. Finally, we numerically verify that the spectral functions in the temporal regime are strongly related to the quasi-normal modes with complex frequencies $\omega_0=m_{\rm{pole}}-i \Gamma/2$. |
hep-ph/0211210 | Pierpaolo Mastrolia | P. Mastrolia (1 and 2), E. Remiddi (1 and 3) ((1) University of
Bologna, (2) University of Karlsruhe, (3) INFN-Bologna) | Analytic evaluation of Feynman graph integrals | 5 pages, 1 figure, uses npb.sty. Presented at RADCOR 2002 and Loops
and Legs in Quantum Field Theory, 8-13 September 2002, Kloster Banz, Germany.
Revised version: minor typos corrected, one reference added | Nucl.Phys.Proc.Suppl. 116 (2003) 412-416 | 10.1016/S0920-5632(03)80210-4 | null | hep-ph | null | We review the main steps of the differential equation approach to the
analytic evaluation of Feynman graphs, showing at the same time its application
to the 3-loop sunrise graph in a particular kinematical configuration.
| [
{
"created": "Wed, 13 Nov 2002 19:56:17 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Nov 2002 20:46:13 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Mastrolia",
"P.",
"",
"1 and 2"
],
[
"Remiddi",
"E.",
"",
"1 and 3"
]
] | We review the main steps of the differential equation approach to the analytic evaluation of Feynman graphs, showing at the same time its application to the 3-loop sunrise graph in a particular kinematical configuration. |
2011.12304 | Kristjan Kannike | Kristjan Kannike, Kaius Loos, Luca Marzola | Minima of Classically Scale-Invariant Potentials | 43 pages, 6 figures, published version | null | 10.1007/JHEP06(2021)128 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new formalism to analyse the extremum structure of
scale-invariant effective potentials. The problem is stated in a compact matrix
form, used to derive general expressions for the stationary point equation and
the mass matrix of a multi-field RG-improved effective potential. Our method
improves on (but is not limited to) the Gildener-Weinberg approximation and
identifies a set of conditions that signal the presence of a radiative minimum.
When the conditions are satisfied at different scales, or in different
subspaces of the field space, the effective potential has more than one
radiative minimum. We illustrate the method through simple examples and study
in detail a Standard-Model-like scenario where the potential admits two
radiative minima. Whereas we mostly concentrate on biquadratic potentials, our
results carry over to the general case by using tensor algebra.
| [
{
"created": "Tue, 24 Nov 2020 19:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Nov 2021 13:07:08 GMT",
"version": "v2"
}
] | 2021-11-12 | [
[
"Kannike",
"Kristjan",
""
],
[
"Loos",
"Kaius",
""
],
[
"Marzola",
"Luca",
""
]
] | We propose a new formalism to analyse the extremum structure of scale-invariant effective potentials. The problem is stated in a compact matrix form, used to derive general expressions for the stationary point equation and the mass matrix of a multi-field RG-improved effective potential. Our method improves on (but is not limited to) the Gildener-Weinberg approximation and identifies a set of conditions that signal the presence of a radiative minimum. When the conditions are satisfied at different scales, or in different subspaces of the field space, the effective potential has more than one radiative minimum. We illustrate the method through simple examples and study in detail a Standard-Model-like scenario where the potential admits two radiative minima. Whereas we mostly concentrate on biquadratic potentials, our results carry over to the general case by using tensor algebra. |
hep-ph/0410086 | Michal Praszalowicz | Michal Praszalowicz | SU(3) constraints on cryptoexotic pentaquarks | 9 pages, 5 figures, contribution to Festschrift for Klaus Goeke's
60th birthday, to be published in Nov./Dec. 2004 issue of Annalen der Physik | Annalen Phys. 13 (2004) 709-717 | 10.1002/andp.200410113 | TPJU-15/2004 | hep-ph | null | We examine SU(3) constraints on the spectrum and decay widths of cryptoexotic
nucleon-like states in antidecuplet of pentaquarks. We show that in the ideal
mixing scenario the number of free matrix elements describing splittings
reduces from 4 to 2. Model-independent sum rules are derived.
Using as input $\Theta^+$ and $\Xi_{3/2}$ masses we show that it is difficult
to interpret Roper and $N^{\ast}(1710)$ nucleon resonances as cryptoexotic
pentaquarks. Large $N_c$ limit for antidecuplet and accompanying octet in the
diqaurk picture and the analogy with the soliton model is also discussed.
| [
{
"created": "Wed, 6 Oct 2004 16:30:21 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Praszalowicz",
"Michal",
""
]
] | We examine SU(3) constraints on the spectrum and decay widths of cryptoexotic nucleon-like states in antidecuplet of pentaquarks. We show that in the ideal mixing scenario the number of free matrix elements describing splittings reduces from 4 to 2. Model-independent sum rules are derived. Using as input $\Theta^+$ and $\Xi_{3/2}$ masses we show that it is difficult to interpret Roper and $N^{\ast}(1710)$ nucleon resonances as cryptoexotic pentaquarks. Large $N_c$ limit for antidecuplet and accompanying octet in the diqaurk picture and the analogy with the soliton model is also discussed. |
hep-ph/0612300 | S. Y. Tsai | Chikara Fuji, Yasumasa Matsuura, Toshihiro Shibuya and S.Y.Tsai | A Wave-Packet View of Neutrino Oscillation and Pion Decay | 25 pages | null | null | NUP-A-06-2 | hep-ph | null | Kinematical aspects of pion decay $\pi \to \mu \nu$ is studied, with neutrino
mixing taken into account. An attempt is made to derive the transition
probability for such a sequence of processes: a $\pi^+$ produced at
$(\vec{x}_{\pi},t_{\pi})$ with momentum $\vec{p}_{\pi}$ decays into a $\mu^+$
and a $\nu_{\mu}$ somewhere in space-time and then the $\mu^+$ is detected at
$(\vec{x}_{\mu},t_{\mu})$ with momentum $\vec{p}_{\mu}$ and a $\nu_{\alpha}$ (a
neutrino with flavor $\alpha = e$, $\mu$, $...$) is detected at
$(\vec{x}_{\nu},t_{\nu})$ with momentum $\vec{p}_{\nu}$. It is shown that (1)
if all the particles involved are treated as plane-waves, the energy-momentum
conservation would eliminate the neutrino oscillating terms, leaving each
mass-eigenstate to contribute separately to the transition probability; (2) if
one treats all the particles involved as wave-packets, the neutrino oscillating
terms would appear and would be multiplied by two suppression factors, which
result from distinction in velocity and in energy between the two interfering
neutrino mass-eigenstates. An approximate treatment which takes account of the
two complementary features, each of the particles involved propagates along its
classical trajectory on the one hand and energies and momenta of the particles
involved are conserved during the decay on the other hand, is proposed and
similarity and difference between our approach and that of Dolgov et al. are
discussed.
| [
{
"created": "Fri, 22 Dec 2006 08:24:12 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Fuji",
"Chikara",
""
],
[
"Matsuura",
"Yasumasa",
""
],
[
"Shibuya",
"Toshihiro",
""
],
[
"Tsai",
"S. Y.",
""
]
] | Kinematical aspects of pion decay $\pi \to \mu \nu$ is studied, with neutrino mixing taken into account. An attempt is made to derive the transition probability for such a sequence of processes: a $\pi^+$ produced at $(\vec{x}_{\pi},t_{\pi})$ with momentum $\vec{p}_{\pi}$ decays into a $\mu^+$ and a $\nu_{\mu}$ somewhere in space-time and then the $\mu^+$ is detected at $(\vec{x}_{\mu},t_{\mu})$ with momentum $\vec{p}_{\mu}$ and a $\nu_{\alpha}$ (a neutrino with flavor $\alpha = e$, $\mu$, $...$) is detected at $(\vec{x}_{\nu},t_{\nu})$ with momentum $\vec{p}_{\nu}$. It is shown that (1) if all the particles involved are treated as plane-waves, the energy-momentum conservation would eliminate the neutrino oscillating terms, leaving each mass-eigenstate to contribute separately to the transition probability; (2) if one treats all the particles involved as wave-packets, the neutrino oscillating terms would appear and would be multiplied by two suppression factors, which result from distinction in velocity and in energy between the two interfering neutrino mass-eigenstates. An approximate treatment which takes account of the two complementary features, each of the particles involved propagates along its classical trajectory on the one hand and energies and momenta of the particles involved are conserved during the decay on the other hand, is proposed and similarity and difference between our approach and that of Dolgov et al. are discussed. |
hep-ph/0703130 | Sabine Kraml | Laura Covi, Sabine Kraml | Collider signatures of gravitino dark matter with a sneutrino NLSP | 13 pages, 5 figures; 2 typos corrected, version published in JHEP | JHEP0708:015,2007 | 10.1088/1126-6708/2007/08/015 | CERN-PH-TH/2007-049, DESY-07-029 | hep-ph astro-ph | null | For gravitino dark matter with conserved R-parity and mass in the GeV range,
very strong constraints from Big Bang Nucleosynthesis exclude the popular NLSP
candidates like neutralino and charged sleptons. In this letter we therefore
draw attention to the case of a sneutrino NLSP, that is naturally realised in
the context of gaugino mediation. We find interesting collider signatures,
characterised by soft jets or leptons due to the small sneutrino--stau mass
splitting. Moreover, the lightest neutralino can have visible decays into
staus, and in some part of the parameter space also into selectrons and smuons.
We also show the importance of coannihilation effects for the evaluation of the
BBN constraints.
| [
{
"created": "Mon, 12 Mar 2007 19:18:24 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Jul 2007 13:31:33 GMT",
"version": "v2"
},
{
"created": "Mon, 6 Aug 2007 16:31:51 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Covi",
"Laura",
""
],
[
"Kraml",
"Sabine",
""
]
] | For gravitino dark matter with conserved R-parity and mass in the GeV range, very strong constraints from Big Bang Nucleosynthesis exclude the popular NLSP candidates like neutralino and charged sleptons. In this letter we therefore draw attention to the case of a sneutrino NLSP, that is naturally realised in the context of gaugino mediation. We find interesting collider signatures, characterised by soft jets or leptons due to the small sneutrino--stau mass splitting. Moreover, the lightest neutralino can have visible decays into staus, and in some part of the parameter space also into selectrons and smuons. We also show the importance of coannihilation effects for the evaluation of the BBN constraints. |
2210.04640 | Xiang Liu | Yu-Shuai Li, Su-Ping Jin, Jing Gao, Xiang Liu | Transition form factors and angular distributions of the
$\bm{\Lambda_b\to\Lambda(1520)(\to N\bar{K})\ell^+\ell^-}$ decay supported by
baryon spectroscopy | 21 pages, 9 figures. Accepted by Phys. Rev. D | Phys. Rev. D 107, 093003 (2023) | 10.1103/PhysRevD.107.093003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the weak transition form factors of the
$\Lambda_b\to\Lambda(1520)$ transition, and further calculate the angular
distributions of the rare decays $\Lambda_b\to\Lambda(1520)(\to
N\bar{K})\ell^{+}\ell^{-}$ ($N\bar{K}=\{pK^-,n\bar{K}^0\}$) with unpolarized
$\Lambda_b$ and massive leptons. The form factors are calculated by the
three-body light-front quark model with the support of numerical wave functions
of $\Lambda_b$ and $\Lambda(1520)$ from solving the semirelativistic potential
model associated with the Gaussian expansion method. By fitting the mass
spectrum of the observed single bottom and charmed baryons, the parameters of
the potential model are fixed, so this strategy can avoid the uncertainties
arising from the choice of a simple harmonic oscillator wave function of the
baryons. With more data accumulated in the LHCb experiment, our result can help
for exploring the $\Lambda_b\to\Lambda(1520)\ell^+\ell^-$ decay and deepen our
understanding on the $b\to s\ell^+\ell^-$ processes.
| [
{
"created": "Mon, 10 Oct 2022 12:43:05 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Oct 2022 02:26:21 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Apr 2023 06:36:55 GMT",
"version": "v3"
},
{
"created": "Mon, 1 May 2023 11:45:31 GMT",
"version": "v4"
}
] | 2023-05-12 | [
[
"Li",
"Yu-Shuai",
""
],
[
"Jin",
"Su-Ping",
""
],
[
"Gao",
"Jing",
""
],
[
"Liu",
"Xiang",
""
]
] | We calculate the weak transition form factors of the $\Lambda_b\to\Lambda(1520)$ transition, and further calculate the angular distributions of the rare decays $\Lambda_b\to\Lambda(1520)(\to N\bar{K})\ell^{+}\ell^{-}$ ($N\bar{K}=\{pK^-,n\bar{K}^0\}$) with unpolarized $\Lambda_b$ and massive leptons. The form factors are calculated by the three-body light-front quark model with the support of numerical wave functions of $\Lambda_b$ and $\Lambda(1520)$ from solving the semirelativistic potential model associated with the Gaussian expansion method. By fitting the mass spectrum of the observed single bottom and charmed baryons, the parameters of the potential model are fixed, so this strategy can avoid the uncertainties arising from the choice of a simple harmonic oscillator wave function of the baryons. With more data accumulated in the LHCb experiment, our result can help for exploring the $\Lambda_b\to\Lambda(1520)\ell^+\ell^-$ decay and deepen our understanding on the $b\to s\ell^+\ell^-$ processes. |
hep-ph/0504160 | Ryuichiro Kitano | Yuval Grossman, Ryuichiro Kitano, Hitoshi Murayama | Natural soft leptogenesis | 11 pages, 1 figure | JHEP 0506:058,2005 | 10.1088/1126-6708/2005/06/058 | null | hep-ph | null | Successful soft leptogenesis requires small B-terms for the right-handed
sneutrinos and a large CP violating phase between the A- and B-terms. We show
that this situation is realized naturally within the framework of gauge
mediated supersymmetry breaking. The A-term is dominated by contribution from
gauge mediation, while supergravity effects are more important for the B-term.
The different origins naturally explain simultaneously the smallness of the
B-term and the large CP violating phase. The most stringent bounds on the model
come from the cosmological gravitino problem. We find a viable parameter region
with very light gravitino $m_{3/2} \lesssim 16 eV$, providing a consistent
framework for supersymmetry phenomenology, soft leptogenesis and cosmology.
| [
{
"created": "Mon, 18 Apr 2005 20:04:31 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Apr 2005 21:23:17 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Grossman",
"Yuval",
""
],
[
"Kitano",
"Ryuichiro",
""
],
[
"Murayama",
"Hitoshi",
""
]
] | Successful soft leptogenesis requires small B-terms for the right-handed sneutrinos and a large CP violating phase between the A- and B-terms. We show that this situation is realized naturally within the framework of gauge mediated supersymmetry breaking. The A-term is dominated by contribution from gauge mediation, while supergravity effects are more important for the B-term. The different origins naturally explain simultaneously the smallness of the B-term and the large CP violating phase. The most stringent bounds on the model come from the cosmological gravitino problem. We find a viable parameter region with very light gravitino $m_{3/2} \lesssim 16 eV$, providing a consistent framework for supersymmetry phenomenology, soft leptogenesis and cosmology. |
hep-ph/9911309 | John F. Donoghue | John F. Donoghue and Eugene Golowich | Dispersive calculation of B_7^{3/2} and B_8^{3/2} in the chiral limit | 16 pages, 1 figure | Phys.Lett. B478 (2000) 172-184 | 10.1016/S0370-2693(00)00239-2 | null | hep-ph | null | We show how the isospin vector and axialvector current spectral functions
rho_V and rho_A can be used to determine in leading chiral order the low energy
constants B_7^{3/2} and B_8^{3/2}. This is accomplished by matching the
Operator Product Expansion to the dispersive analysis of vacuum polarization
functions. The data for the evaluation of these dispersive integrals has been
recently enhanced by the ALEPH measurement of spectral functions in tau decay,
and we update our previous phenomenological determination. Our calculation
yields in the NDR renormalization scheme and at renormalization scale mu = 2
GeV the values B_7^{3/2} = 0.55 +- 0.07 +- 0.10 and B_8^{3/2} = 1.11 +- 0.16 +-
0.23 for the quark mass values m_s + m = 0.1 GeV.
| [
{
"created": "Thu, 11 Nov 1999 08:27:38 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Donoghue",
"John F.",
""
],
[
"Golowich",
"Eugene",
""
]
] | We show how the isospin vector and axialvector current spectral functions rho_V and rho_A can be used to determine in leading chiral order the low energy constants B_7^{3/2} and B_8^{3/2}. This is accomplished by matching the Operator Product Expansion to the dispersive analysis of vacuum polarization functions. The data for the evaluation of these dispersive integrals has been recently enhanced by the ALEPH measurement of spectral functions in tau decay, and we update our previous phenomenological determination. Our calculation yields in the NDR renormalization scheme and at renormalization scale mu = 2 GeV the values B_7^{3/2} = 0.55 +- 0.07 +- 0.10 and B_8^{3/2} = 1.11 +- 0.16 +- 0.23 for the quark mass values m_s + m = 0.1 GeV. |
hep-ph/0503276 | Ulf-G. Mei{\ss}ner | A. Sibirtsev (Bonn U.), Ulf-G. Mei{\ss}ner (Bonn U. and FZ J\"ulich),
and A.W. Thomas (Jefferson Lab) | Okubo-Zweig-Iizuka rule violation in photoproduction | 5 pages, 4 PS figures, small modifications, version to appear in
Phys. Rev. D (note: title changed in journal) | Phys.Rev.D71:094011,2005 | 10.1103/PhysRevD.71.094011 | FZJ-IKP(TH)-2005-10, HISKP-TH-05-07, JLAB-THY-05-309 | hep-ph hep-ex nucl-ex nucl-th | null | We investigate OZI rule violation in omega and phi-meson photoproduction off
nucleons. Data on the total cross sections indicate a large phi/omega ratio of
about 0.8 at the maximal available photon energy that is in good agreement with
expectations from QCD. On the other hand, data at large four momentum transfer
exhibit a ratio of about 0.07, showing that the perturbative QCD regime is not
approached at |t| > 2 GeV^2 and photon energies E_\gamma < 4 GeV. The
anomanously large phi/omega ratio at low energies, that is close to the
reaction threshold, remains to be explained within nonperturbative QCD.
| [
{
"created": "Tue, 29 Mar 2005 11:40:33 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Mar 2005 10:50:18 GMT",
"version": "v2"
},
{
"created": "Wed, 4 May 2005 06:42:18 GMT",
"version": "v3"
}
] | 2010-02-17 | [
[
"Sibirtsev",
"A.",
"",
"Bonn U."
],
[
"Meißner",
"Ulf-G.",
"",
"Bonn U. and FZ Jülich"
],
[
"Thomas",
"A. W.",
"",
"Jefferson Lab"
]
] | We investigate OZI rule violation in omega and phi-meson photoproduction off nucleons. Data on the total cross sections indicate a large phi/omega ratio of about 0.8 at the maximal available photon energy that is in good agreement with expectations from QCD. On the other hand, data at large four momentum transfer exhibit a ratio of about 0.07, showing that the perturbative QCD regime is not approached at |t| > 2 GeV^2 and photon energies E_\gamma < 4 GeV. The anomanously large phi/omega ratio at low energies, that is close to the reaction threshold, remains to be explained within nonperturbative QCD. |
hep-ph/0110054 | Oshimo | Noriyuki Oshimo | Neutron Electric Dipole Moment and Extension of the Standard Model | 7 pages, LaTeX file. To appear in the Proceedings of RCNP Workshop on
Production of Ultra Cold Neutrons and Fundamental Physics, Osaka, Japan, Aug.
6-8, 2001 | null | null | OCHA-PP-181 | hep-ph | null | A nonvanishing value for the electric dipole moment (EDM) of the neutron is a
prominent signature for CP violation. The EDM induced by the Kobayashi-Maskawa
mechanism of the standard model (SM) has a small magnitude and its detection
will be very difficult. However, since baryon asymmetry of the universe cannot
be accounted for by the SM, there should exist some other source of CP
violation, which may generate a large magnitude for the EDM. One of the most
hopeful candidates for physics beyond the SM is the supersymmetric standard
model, which contains such sources of CP violation. This model suggests that
the EDM has a magnitude not much smaller than the present experimental bounds.
Progress in measuring the EDM provides very interesting information about
extension of the SM. ........
| [
{
"created": "Thu, 4 Oct 2001 06:26:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Oshimo",
"Noriyuki",
""
]
] | A nonvanishing value for the electric dipole moment (EDM) of the neutron is a prominent signature for CP violation. The EDM induced by the Kobayashi-Maskawa mechanism of the standard model (SM) has a small magnitude and its detection will be very difficult. However, since baryon asymmetry of the universe cannot be accounted for by the SM, there should exist some other source of CP violation, which may generate a large magnitude for the EDM. One of the most hopeful candidates for physics beyond the SM is the supersymmetric standard model, which contains such sources of CP violation. This model suggests that the EDM has a magnitude not much smaller than the present experimental bounds. Progress in measuring the EDM provides very interesting information about extension of the SM. ........ |
hep-ph/0106344 | Lin Zhi-Hai | Z.-H. Lin (BIHEP), T. Han (Wisconsin U., Madison), T. Huang (BIHEP),
J.-X. Wang (BIHEP) and X. Zhang (BIHEP) | Top-quark spin correlation at Linear Colliders with anomalous couplings | 23 pages, 10 figures, references added | Phys.Rev. D65 (2002) 014008 | 10.1103/PhysRevD.65.014008 | null | hep-ph | null | We investigate the feasibility of probing anomalous top-quark couplings of
$Wtb$, $Z t \bar{t}$, and $\gamma t \bar{t}$ in terms of an effective
Lagrangian with dimension-six operators at future $e^+e^-$ linear colliders
with a c. m. energy $\sqrt s \sim 500-800$ GeV. We first examine the
constraints on these anomalous couplings from the $Z\to b \bar{b}$ data at LEP
I and from unitarity considerations. We then consider in detail the effects of
anomalous couplings on $t \bar{t}$ spin correlations in the top-pair production
and decay with three spin bases: the helicity, beamline and off-diagonal bases.
Our results show that the polarized beams are more suitable for exploring the
effects of different new operators. For polarized beams, the helicity basis
yields the best sensitivity.
| [
{
"created": "Fri, 29 Jun 2001 09:28:57 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Jul 2001 03:13:05 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Lin",
"Z. -H.",
"",
"BIHEP"
],
[
"Han",
"T.",
"",
"Wisconsin U., Madison"
],
[
"Huang",
"T.",
"",
"BIHEP"
],
[
"Wang",
"J. -X.",
"",
"BIHEP"
],
[
"Zhang",
"X.",
"",
"BIHEP"
]
] | We investigate the feasibility of probing anomalous top-quark couplings of $Wtb$, $Z t \bar{t}$, and $\gamma t \bar{t}$ in terms of an effective Lagrangian with dimension-six operators at future $e^+e^-$ linear colliders with a c. m. energy $\sqrt s \sim 500-800$ GeV. We first examine the constraints on these anomalous couplings from the $Z\to b \bar{b}$ data at LEP I and from unitarity considerations. We then consider in detail the effects of anomalous couplings on $t \bar{t}$ spin correlations in the top-pair production and decay with three spin bases: the helicity, beamline and off-diagonal bases. Our results show that the polarized beams are more suitable for exploring the effects of different new operators. For polarized beams, the helicity basis yields the best sensitivity. |
1906.07182 | Artem Lipatov | S.P. Baranov, A.V. Lipatov | Are there any challenges in the charmonia production and polarization at
the LHC? | 24 pages, 12 figures. arXiv admin note: text overlap with
arXiv:1611.10141 | Phys. Rev. D 100, 114021 (2019) | 10.1103/PhysRevD.100.114021 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the inclusive prompt production of $\psi^\prime$, $\chi_c$,
$J/\psi$ and $\eta_c$ mesons at the LHC using the $k_T$-factorization approach.
Our consideration is based on the off-shell production amplitudes for hard
partonic subprocesses, nonrelativistic QCD formalism for the formation of bound
states and transverse momentum dependent (or unintegrated) gluon densities in a
proton derived from Catani-Ciafaloni-Fiorani-Marchesini equation. The
nonperturbative color octet transitions are treated in terms of the multipole
radiation theory. We extract the corresponding long-distance matrix elements
from a combined fit to transverse momentum distributions measured at various
LHC experiments. We make predictions for the polarization parameters
$\lambda_\theta$, $\lambda_\phi$, $\lambda_{\theta \phi}$ and the
frame-independent parameter $\lambda^*$ and compare them to the available
$\psi^\prime$ and $J/\psi$ data. Finally, we present a universal set of
parameters that provides a reasonable simultaneous description for the whole
body of the LHC data (on the $p_T$ distributions, relative production rates and
polarization observables) for the whole charmonium family.
| [
{
"created": "Mon, 17 Jun 2019 14:15:44 GMT",
"version": "v1"
}
] | 2019-12-18 | [
[
"Baranov",
"S. P.",
""
],
[
"Lipatov",
"A. V.",
""
]
] | We analyze the inclusive prompt production of $\psi^\prime$, $\chi_c$, $J/\psi$ and $\eta_c$ mesons at the LHC using the $k_T$-factorization approach. Our consideration is based on the off-shell production amplitudes for hard partonic subprocesses, nonrelativistic QCD formalism for the formation of bound states and transverse momentum dependent (or unintegrated) gluon densities in a proton derived from Catani-Ciafaloni-Fiorani-Marchesini equation. The nonperturbative color octet transitions are treated in terms of the multipole radiation theory. We extract the corresponding long-distance matrix elements from a combined fit to transverse momentum distributions measured at various LHC experiments. We make predictions for the polarization parameters $\lambda_\theta$, $\lambda_\phi$, $\lambda_{\theta \phi}$ and the frame-independent parameter $\lambda^*$ and compare them to the available $\psi^\prime$ and $J/\psi$ data. Finally, we present a universal set of parameters that provides a reasonable simultaneous description for the whole body of the LHC data (on the $p_T$ distributions, relative production rates and polarization observables) for the whole charmonium family. |
1609.04133 | Melahat Bayar | Melahat Bayar, Francesca Aceti, Feng-Kun Guo and Eulogio Oset | A Discussion on Triangle Singularities in the $\Lambda_b \to J/\psi
K^{-} p$ Reaction | 17 pages, 7 figures, 2 Tables | Phys. Rev. D 94, 074039 (2016) | 10.1103/PhysRevD.94.074039 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have analyzed the singularities of a triangle loop integral in detail and
derived a formula for an easy evaluation of the triangle singularity on the
physical boundary. It is applied to the $\Lambda_b \rightarrow J/\psi K^{-} p$
process via $\Lambda^*$-charmonium-proton intermediate states. Although the
evaluation of absolute rates is not possible, we identify the $\chi_{c1}$ and
the $\psi(2S)$ as the relatively most relevant states among all possible
charmonia up to the $\psi(2S)$. The $\Lambda(1890)\, \chi_{c1}\, p$ loop is
very special as its normal threshold and triangle singularities merge at about
4.45 GeV, generating a narrow and prominent peak in the amplitude in the case
that the $\chi_{c1}\, p$ is in an $S$-wave. We also see that loops with the
same charmonium and other $\Lambda^*$ hyperons produce less dramatic peaks from
the threshold singularity alone. For the case of $\chi_{c1}\, p \rightarrow
J/\psi\, p$ and quantum numbers $3/2^-$ or $5/2^+$ one needs $P$- and
$D$-waves, respectively, in the $\chi_{c1}\, p$, which drastically reduce the
strength of the contribution and smooth the threshold peak. In this case we
conclude that the singularities cannot account for the observed narrow peak. In
the case of $1/2^+$, $3/2^+$ quantum numbers, where $\chi_{c1}\, p \rightarrow
J/\psi\, p$ can proceed in an $S$-wave, the $\Lambda(1890)\,\chi_{c1}\,p$
triangle diagram could play an important role, though can neither assert their
strength without further input from experiments and lattice QCD calculations.
| [
{
"created": "Wed, 14 Sep 2016 04:22:44 GMT",
"version": "v1"
}
] | 2016-11-02 | [
[
"Bayar",
"Melahat",
""
],
[
"Aceti",
"Francesca",
""
],
[
"Guo",
"Feng-Kun",
""
],
[
"Oset",
"Eulogio",
""
]
] | We have analyzed the singularities of a triangle loop integral in detail and derived a formula for an easy evaluation of the triangle singularity on the physical boundary. It is applied to the $\Lambda_b \rightarrow J/\psi K^{-} p$ process via $\Lambda^*$-charmonium-proton intermediate states. Although the evaluation of absolute rates is not possible, we identify the $\chi_{c1}$ and the $\psi(2S)$ as the relatively most relevant states among all possible charmonia up to the $\psi(2S)$. The $\Lambda(1890)\, \chi_{c1}\, p$ loop is very special as its normal threshold and triangle singularities merge at about 4.45 GeV, generating a narrow and prominent peak in the amplitude in the case that the $\chi_{c1}\, p$ is in an $S$-wave. We also see that loops with the same charmonium and other $\Lambda^*$ hyperons produce less dramatic peaks from the threshold singularity alone. For the case of $\chi_{c1}\, p \rightarrow J/\psi\, p$ and quantum numbers $3/2^-$ or $5/2^+$ one needs $P$- and $D$-waves, respectively, in the $\chi_{c1}\, p$, which drastically reduce the strength of the contribution and smooth the threshold peak. In this case we conclude that the singularities cannot account for the observed narrow peak. In the case of $1/2^+$, $3/2^+$ quantum numbers, where $\chi_{c1}\, p \rightarrow J/\psi\, p$ can proceed in an $S$-wave, the $\Lambda(1890)\,\chi_{c1}\,p$ triangle diagram could play an important role, though can neither assert their strength without further input from experiments and lattice QCD calculations. |
2111.12585 | Ryo Nagai | Shinya Kanemura and Ryo Nagai | A new Higgs effective field theory and the new no-lose theorem | 34 pages and 6 figures | null | 10.1007/JHEP03(2022)194 | OU-HET-1122 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non-decoupling effects of heavy new particles cannot be described by the
standard effective field theory with finite truncation of higher dimensional
operators. We propose a new effective field theory in which non-decoupling
quantum effects of new physics are correctly described. We discuss vacuum
stability and perturbative unitarity in our effective field theory, and we find
that the scale of new physics can be estimated if we will observe the Higgs
coupling deviation via non-decoupling effects in future collider experiments.
| [
{
"created": "Wed, 24 Nov 2021 16:03:15 GMT",
"version": "v1"
}
] | 2022-04-13 | [
[
"Kanemura",
"Shinya",
""
],
[
"Nagai",
"Ryo",
""
]
] | Non-decoupling effects of heavy new particles cannot be described by the standard effective field theory with finite truncation of higher dimensional operators. We propose a new effective field theory in which non-decoupling quantum effects of new physics are correctly described. We discuss vacuum stability and perturbative unitarity in our effective field theory, and we find that the scale of new physics can be estimated if we will observe the Higgs coupling deviation via non-decoupling effects in future collider experiments. |
2007.14124 | Yutaro Shoji | So Chigusa, Takeo Moroi and Yutaro Shoji | Precise Calculation of the Decay Rate of False Vacuum with Multi-Field
Bounce | 68 pages, 1 figure; published version | null | 10.1007/JHEP11(2020)006 | KEK-TH-2244 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the decay rate of a false vacuum in gauge theory at the one-loop
level. We pay particular attention to the case where the bounce consists of an
arbitrary number of scalar fields. With a multi-field bounce, which has a
curved trajectory in the field space, the mixing among the gauge fields and the
scalar fields evolves along the path of the bounce in the field space and the
one-loop calculation of the vacuum decay rate becomes complicated. We consider
the one-loop contribution to the decay rate with an arbitrary choice of the
gauge parameter, and obtain a gauge invariant expression of the vacuum decay
rate. We also give proper treatments of gauge zero modes and renormalization.
| [
{
"created": "Tue, 28 Jul 2020 11:10:59 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Nov 2020 06:25:24 GMT",
"version": "v2"
}
] | 2020-12-02 | [
[
"Chigusa",
"So",
""
],
[
"Moroi",
"Takeo",
""
],
[
"Shoji",
"Yutaro",
""
]
] | We study the decay rate of a false vacuum in gauge theory at the one-loop level. We pay particular attention to the case where the bounce consists of an arbitrary number of scalar fields. With a multi-field bounce, which has a curved trajectory in the field space, the mixing among the gauge fields and the scalar fields evolves along the path of the bounce in the field space and the one-loop calculation of the vacuum decay rate becomes complicated. We consider the one-loop contribution to the decay rate with an arbitrary choice of the gauge parameter, and obtain a gauge invariant expression of the vacuum decay rate. We also give proper treatments of gauge zero modes and renormalization. |
2209.02348 | Zhen-Hua Zhang | Ya-Rui Wei and Zhen-Hua Zhang | Forward-backward asymmetry induced $CP$ asymmetry of $B^{\pm}\rightarrow
\pi^{\pm}\pi^{+}\pi^{-}$ | 14 pages, 5 figures, 3 tables, version accepted by PRD | Phys. Rev. D 106 (2022), 113002 | 10.1103/PhysRevD.106.113002 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | $CP$ violation of the decay $B^{\pm}\rightarrow \pi^{\pm}\pi^{+}\pi^{-}$ in
the $f_{0}(500)-\rho(770)^{0}$ interfering region is analyzed. The
forward-backward asymmetries (FBAs) and the corresponding $CP$ asymmetries
FB-$CP$As are particularly investigated. To isolate the $CP$V caused by the
interference of different partial wave more cleanly, we also introduce the
direct-$CP$V-subtracted FB-$CP$A. Based on the LHCb data, we extract the FBAs,
FB-$CP$As, direct-$CP$V-subtracted FB-$CP$A, as well as the regional $CP$As
with invariant mass of the $\pi^{+}\pi^{-}$ pair in the range 0.2
GeV/$c^{2}<\sqrt{s_{\text{low}}}<1.8$ GeV/$c^{2}$. It is found that the
(direct-$CP$V-subtracted) FB-$CP$As are quite large in the
$f_{0}(500)-\rho(770)^{0}$ interfering region, which confirms that the
interference of the intermediate resonances $f_{0}(500)$ and $\rho(770)^{0}$
plays an important role for the $CP$ violation of the three-body decay channel
$B^{\pm}\rightarrow \pi^{\pm}\pi^{+}\pi^{-}$.
| [
{
"created": "Tue, 6 Sep 2022 10:25:35 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Dec 2022 09:08:07 GMT",
"version": "v2"
}
] | 2022-12-14 | [
[
"Wei",
"Ya-Rui",
""
],
[
"Zhang",
"Zhen-Hua",
""
]
] | $CP$ violation of the decay $B^{\pm}\rightarrow \pi^{\pm}\pi^{+}\pi^{-}$ in the $f_{0}(500)-\rho(770)^{0}$ interfering region is analyzed. The forward-backward asymmetries (FBAs) and the corresponding $CP$ asymmetries FB-$CP$As are particularly investigated. To isolate the $CP$V caused by the interference of different partial wave more cleanly, we also introduce the direct-$CP$V-subtracted FB-$CP$A. Based on the LHCb data, we extract the FBAs, FB-$CP$As, direct-$CP$V-subtracted FB-$CP$A, as well as the regional $CP$As with invariant mass of the $\pi^{+}\pi^{-}$ pair in the range 0.2 GeV/$c^{2}<\sqrt{s_{\text{low}}}<1.8$ GeV/$c^{2}$. It is found that the (direct-$CP$V-subtracted) FB-$CP$As are quite large in the $f_{0}(500)-\rho(770)^{0}$ interfering region, which confirms that the interference of the intermediate resonances $f_{0}(500)$ and $\rho(770)^{0}$ plays an important role for the $CP$ violation of the three-body decay channel $B^{\pm}\rightarrow \pi^{\pm}\pi^{+}\pi^{-}$. |
0911.4632 | Giacomo Cacciapaglia | G.Cacciapaglia (IPN Lyon), S.Rai Choudhury (Jamia Millia Islamia),
A.Deandrea (IPN Lyon), N.Gaur (Delhi U.) | T-parity odd heavy leptons at LHC | 18 pages, 14 figures; added section on T-odd neutrino pair
production, added references | Phys.Rev.D81:075005,2010 | 10.1103/PhysRevD.81.075005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Little Higgs models with T-parity can easily satisfy electroweak precision
tests and at the same time give a stable particle which is a candidate for cold
dark matter. In addition to little Higgs heavy gauge bosons, this type of
models predicts a set of new T-odd fermions, which may show quite interesting
signatures at colliders. We study purely leptonic signatures of T-odd leptons
at the Large Hadron Collider (LHC).
| [
{
"created": "Tue, 24 Nov 2009 13:52:23 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Dec 2009 17:14:30 GMT",
"version": "v2"
}
] | 2010-04-14 | [
[
"Cacciapaglia",
"G.",
"",
"IPN Lyon"
],
[
"Choudhury",
"S. Rai",
"",
"Jamia Millia Islamia"
],
[
"Deandrea",
"A.",
"",
"IPN Lyon"
],
[
"Gaur",
"N.",
"",
"Delhi U."
]
] | Little Higgs models with T-parity can easily satisfy electroweak precision tests and at the same time give a stable particle which is a candidate for cold dark matter. In addition to little Higgs heavy gauge bosons, this type of models predicts a set of new T-odd fermions, which may show quite interesting signatures at colliders. We study purely leptonic signatures of T-odd leptons at the Large Hadron Collider (LHC). |
1709.01416 | Feng-Kun Guo | Ju-Jun Xie, Feng-Kun Guo | Triangular singularity and a possible $\phi p$ resonance in the
$\Lambda^+_c \to \pi^0 \phi p$ decay | 7 pages, 3 figures | Phys. Lett. B 774 (2017) 108 | 10.1016/j.physletb.2017.09.060 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the $\Lambda^+_c \to \pi^0 \phi p$ decay by considering a triangle
singularity mechanism. In this mechanism, the $\Lambda^+_c$ decays into the
$K^* \Sigma^*(1385)$, the $\Sigma^*(1385)$ decays into the $\pi^0 \Sigma$ (or
$\Lambda$), and then the $K^* \Sigma$ (or $\Lambda$) interact to produce the
$\phi p$ in the final state. This mechanism produces a peak structure around
$2020$ MeV. In addition, the possibility that there is a hidden-strange
pentaquark-like state is also considered by taking into account the final state
interactions of $K^* \Lambda$, $K^* \Sigma$, and $\phi p$. We conclude that it
is difficult to search for the hidden-strange analogue of the $P_c$ states in
this decay. However, we do expect nontrivial behavior in the $\phi p$ invariant
mass distribution. The predictions can be tested by experiments such as BESIII,
LHCb and Belle-II.
| [
{
"created": "Tue, 5 Sep 2017 14:29:45 GMT",
"version": "v1"
}
] | 2017-09-29 | [
[
"Xie",
"Ju-Jun",
""
],
[
"Guo",
"Feng-Kun",
""
]
] | We study the $\Lambda^+_c \to \pi^0 \phi p$ decay by considering a triangle singularity mechanism. In this mechanism, the $\Lambda^+_c$ decays into the $K^* \Sigma^*(1385)$, the $\Sigma^*(1385)$ decays into the $\pi^0 \Sigma$ (or $\Lambda$), and then the $K^* \Sigma$ (or $\Lambda$) interact to produce the $\phi p$ in the final state. This mechanism produces a peak structure around $2020$ MeV. In addition, the possibility that there is a hidden-strange pentaquark-like state is also considered by taking into account the final state interactions of $K^* \Lambda$, $K^* \Sigma$, and $\phi p$. We conclude that it is difficult to search for the hidden-strange analogue of the $P_c$ states in this decay. However, we do expect nontrivial behavior in the $\phi p$ invariant mass distribution. The predictions can be tested by experiments such as BESIII, LHCb and Belle-II. |
1811.09711 | Juergen Reuter | Simon Bra{\ss}, Wolfgang Kilian, J\"urgen Reuter | Parallel Adaptive Monte Carlo Integration with the Event Generator
WHIZARD | 28 pages, 4 figures | Eur. Phys. J. C (2019) 79: 344 | 10.1140/epjc/s10052-019-6840-2 | DESY 18-089, SI-HEP-2018-32 | hep-ph hep-ex physics.comp-ph | http://creativecommons.org/licenses/by/4.0/ | We describe a new parallel approach to the evaluation of phase space for
Monte-Carlo event generation, implemented within the framework of the WHIZARD
package. The program realizes a twofold self-adaptive multi-channel
parameterization of phase space and makes use of the standard OpenMP and MPI
protocols for parallelization. The modern MPI3 feature of asynchronous
communication is an essential ingredient of the computing model. Parallel
numerical evaluation applies both to phase-space integration and to event
generation, thus covering the most computing-intensive parts of physics
simulation for a realistic collider environment.
| [
{
"created": "Fri, 23 Nov 2018 21:58:37 GMT",
"version": "v1"
}
] | 2019-04-18 | [
[
"Braß",
"Simon",
""
],
[
"Kilian",
"Wolfgang",
""
],
[
"Reuter",
"Jürgen",
""
]
] | We describe a new parallel approach to the evaluation of phase space for Monte-Carlo event generation, implemented within the framework of the WHIZARD package. The program realizes a twofold self-adaptive multi-channel parameterization of phase space and makes use of the standard OpenMP and MPI protocols for parallelization. The modern MPI3 feature of asynchronous communication is an essential ingredient of the computing model. Parallel numerical evaluation applies both to phase-space integration and to event generation, thus covering the most computing-intensive parts of physics simulation for a realistic collider environment. |
1804.02022 | Kaustav Chakraborty | Kaustav Chakraborty, K.N. Deepthi, Srubabati Goswami, Anjan S.
Joshipura, Newton Nath | Exploring Partial $\mu$-$\tau$ Reflection Symmetry at DUNE and
Hyper-Kamiokande | 10 pages, 17 figures, Updated to the published version | Phys. Rev. D 98, 075031 (2018) | 10.1103/PhysRevD.98.075031 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study origin, consequences and testability of a hypothesis of `partial
$\mu$-$\tau$' reflection symmetry. This symmetry predicts $ |U_{\mu
i}|=|U_{\tau i}|~(i=1,2,3) $ for a single column of the leptonic mixing matrix
$U$. Depending on whether this symmetry holds for the first or second column of
$U$ different correlations between $\theta_{23}$ and $ \delta_{CP} $ can be
obtained. This symmetry can be obtained using discrete flavour symmetries. In
particular, all the subgroups of SU(3) with 3-dimensional irreducible
representation which are classified as class C or D can lead to partial
$\mu$-$\tau$ reflection symmetry. We show how the predictions of this symmetry
compare with the allowed area in the $\sin^2\theta_{23} - \delta_{CP}$ plane as
obtained from the global analysis of neutrino oscillation data. Furthermore, we
study the possibility of testing these symmetries at the proposed DUNE and
Hyper-Kamiokande (HK) experiments (T2HK, T2HKK), by incorporating the
correlations between $\theta_{23}$ and $ \delta_{CP}$ predicted by the
symmetries. We find that when simulated data of DUNE and HK is fitted with the
symmetry predictions, the $\theta_{23}-\delta_{CP}$ parameter space gets
largely restricted near the CP conserving values of $ \delta_{CP} $. Finally,
we illustrate the capability of these experiments to distinguish between the
two cases leading to partial $\mu-\tau$ symmetry namely $|U_{\mu1}| = |U_{\tau
1}|$ and $|U_{\mu 2}| = |U_{\tau 2}|$.
| [
{
"created": "Thu, 5 Apr 2018 18:45:46 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Feb 2019 09:07:31 GMT",
"version": "v2"
}
] | 2019-02-11 | [
[
"Chakraborty",
"Kaustav",
""
],
[
"Deepthi",
"K. N.",
""
],
[
"Goswami",
"Srubabati",
""
],
[
"Joshipura",
"Anjan S.",
""
],
[
"Nath",
"Newton",
""
]
] | We study origin, consequences and testability of a hypothesis of `partial $\mu$-$\tau$' reflection symmetry. This symmetry predicts $ |U_{\mu i}|=|U_{\tau i}|~(i=1,2,3) $ for a single column of the leptonic mixing matrix $U$. Depending on whether this symmetry holds for the first or second column of $U$ different correlations between $\theta_{23}$ and $ \delta_{CP} $ can be obtained. This symmetry can be obtained using discrete flavour symmetries. In particular, all the subgroups of SU(3) with 3-dimensional irreducible representation which are classified as class C or D can lead to partial $\mu$-$\tau$ reflection symmetry. We show how the predictions of this symmetry compare with the allowed area in the $\sin^2\theta_{23} - \delta_{CP}$ plane as obtained from the global analysis of neutrino oscillation data. Furthermore, we study the possibility of testing these symmetries at the proposed DUNE and Hyper-Kamiokande (HK) experiments (T2HK, T2HKK), by incorporating the correlations between $\theta_{23}$ and $ \delta_{CP}$ predicted by the symmetries. We find that when simulated data of DUNE and HK is fitted with the symmetry predictions, the $\theta_{23}-\delta_{CP}$ parameter space gets largely restricted near the CP conserving values of $ \delta_{CP} $. Finally, we illustrate the capability of these experiments to distinguish between the two cases leading to partial $\mu-\tau$ symmetry namely $|U_{\mu1}| = |U_{\tau 1}|$ and $|U_{\mu 2}| = |U_{\tau 2}|$. |
hep-ph/0409223 | Michio Hashimoto | Michio Hashimoto, Deog Ki Hong | Topcolor breaking through boundary conditions | 12 pages, 2 figures. Version to be published in Physical Review D.
Typos corrected | Phys.Rev. D71 (2005) 056004 | 10.1103/PhysRevD.71.056004 | PNUTP-04-A09, MIT-CTP-3540 | hep-ph hep-th | null | The nontrivial boundary conditions (BC's) for the Topcolor breaking are
investigated in the context of the TeV-scale extra dimension scenario. In the
gauge symmetry breaking mechanism via the BC's we do not need to incorporate a
dynamical mechanism for the Topcolor breaking into the model. Moreover, the
Topcolor breaking can be realized without introducing explicitly a (composite)
scalar field. We present a six dimensional model where the top and bottom
quarks in the bulk have the Topcolor charge while the other quarks in the bulk
do not. We also put the electroweak gauge interaction in the six dimensional
bulk. The bottom quark condensation is naturally suppressed owing to the
power-like running of the bulk U(1)_Y interaction, so that only the top
condensation is expected to take place. We explore such a possibility based on
the ladder Schwinger-Dyson equation and show the cutoff to make the model
viable.
| [
{
"created": "Sat, 18 Sep 2004 22:26:19 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Feb 2005 00:24:48 GMT",
"version": "v2"
},
{
"created": "Thu, 10 Mar 2005 22:15:33 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Hashimoto",
"Michio",
""
],
[
"Hong",
"Deog Ki",
""
]
] | The nontrivial boundary conditions (BC's) for the Topcolor breaking are investigated in the context of the TeV-scale extra dimension scenario. In the gauge symmetry breaking mechanism via the BC's we do not need to incorporate a dynamical mechanism for the Topcolor breaking into the model. Moreover, the Topcolor breaking can be realized without introducing explicitly a (composite) scalar field. We present a six dimensional model where the top and bottom quarks in the bulk have the Topcolor charge while the other quarks in the bulk do not. We also put the electroweak gauge interaction in the six dimensional bulk. The bottom quark condensation is naturally suppressed owing to the power-like running of the bulk U(1)_Y interaction, so that only the top condensation is expected to take place. We explore such a possibility based on the ladder Schwinger-Dyson equation and show the cutoff to make the model viable. |
1301.3121 | Chi-Sing Lam | C.S. Lam | Leptonic Mixing and Group Structure Constants | null | null | 10.1103/PhysRevD.87.053018 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hernandez and Smirnov discovered an interesting formula to parametrize each
column of a neutrino mixing matrix by six integers related to the residual
symmetry. We point out that these six integers are not independent, and propose
a way to find the allowed combinations using structure constants of finite
groups.
| [
{
"created": "Mon, 14 Jan 2013 20:44:15 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Lam",
"C. S.",
""
]
] | Hernandez and Smirnov discovered an interesting formula to parametrize each column of a neutrino mixing matrix by six integers related to the residual symmetry. We point out that these six integers are not independent, and propose a way to find the allowed combinations using structure constants of finite groups. |
hep-ph/9903531 | Mankiewicz | N. Kivel and L. Mankiewicz | Conformal string operators and evolution of skewed parton distributions | 24 pages, 2 figures | Nucl.Phys. B557 (1999) 271-295 | 10.1016/S0550-3213(99)00349-1 | TUM/T39-99-04 | hep-ph | null | We have investigated skewed parton distributions in coordinate space. We
found that their evolution can be described in a simple manner in terms of
non-local, conformal operators introduced by Balitsky and Braun. The resulting
formula is given by a Neumann series expansion. Its structure resembles, for
all values of the asymmetry parameter, the well-known solution of the ERBL
equation in the momentum space. Performing Fourier transformation we have
reproduced known results for evolution of momentum-space distributions.
| [
{
"created": "Tue, 30 Mar 1999 14:07:03 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kivel",
"N.",
""
],
[
"Mankiewicz",
"L.",
""
]
] | We have investigated skewed parton distributions in coordinate space. We found that their evolution can be described in a simple manner in terms of non-local, conformal operators introduced by Balitsky and Braun. The resulting formula is given by a Neumann series expansion. Its structure resembles, for all values of the asymmetry parameter, the well-known solution of the ERBL equation in the momentum space. Performing Fourier transformation we have reproduced known results for evolution of momentum-space distributions. |
1504.07892 | Diego Restrepo | Diego Restrepo, Andr\'es Rivera, Marta S\'anchez-Pel\'aez, Oscar
Zapata, Walter Tangarife | Radiative neutrino masses in the singlet-doublet fermion dark matter
model with scalar singlets | 16 pages, 6 figures | Phys. Rev. D 92, 013005 (2015) | 10.1103/PhysRevD.92.013005 | TAUP2993/15 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When the singlet-doublet fermion dark matter model is extended with
additional $Z_2$--odd real singlet scalars, neutrino masses and mixings can be
generated at one-loop level. In this work, we discuss the salient features
arising from the combination of the two resulting simplified dark matter
models. When the $Z_2$-lightest odd particle is a scalar singlet,
$\operatorname{Br}(\mu\to e \gamma)$ could be measurable provided that the
singlet-doublet fermion mixing is small enough. In this scenario, also the new
decay channels of vector-like fermions into scalars can generate interesting
leptonic plus missing transverse energy signals at the LHC. On the other hand,
in the case of doublet-like fermion dark matter, scalar coannihilations lead to
an increase in the relic density which allow to lower the bound of doublet-like
fermion dark matter.
| [
{
"created": "Wed, 29 Apr 2015 15:32:17 GMT",
"version": "v1"
}
] | 2015-07-15 | [
[
"Restrepo",
"Diego",
""
],
[
"Rivera",
"Andrés",
""
],
[
"Sánchez-Peláez",
"Marta",
""
],
[
"Zapata",
"Oscar",
""
],
[
"Tangarife",
"Walter",
""
]
] | When the singlet-doublet fermion dark matter model is extended with additional $Z_2$--odd real singlet scalars, neutrino masses and mixings can be generated at one-loop level. In this work, we discuss the salient features arising from the combination of the two resulting simplified dark matter models. When the $Z_2$-lightest odd particle is a scalar singlet, $\operatorname{Br}(\mu\to e \gamma)$ could be measurable provided that the singlet-doublet fermion mixing is small enough. In this scenario, also the new decay channels of vector-like fermions into scalars can generate interesting leptonic plus missing transverse energy signals at the LHC. On the other hand, in the case of doublet-like fermion dark matter, scalar coannihilations lead to an increase in the relic density which allow to lower the bound of doublet-like fermion dark matter. |
hep-ph/0703066 | Anna-Zuzana Dubnickova | C.Adamuscin, L.Bimbot, S.Dubnicka, A.Z. Dubnickova,
E.Tomasi-Gustafsson | Phenomenological insight into JLab proton polarization data puzzle by
deuteron impulse approximation | Revtex, 6 pages, 7 figures | Phys.Rev.C78:025202,2008 | 10.1103/PhysRevC.78.025202 | null | hep-ph | null | The non-relativistic impulse approximation of deuteron electromagnetic form
factors is used to investigate the space-like region behavior of the proton
electric form factor in regard of the two contradictory experimental results
extracted either from Rosenbluth separation method or from recoil proton JLab
polarization data.
| [
{
"created": "Tue, 6 Mar 2007 16:42:27 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Adamuscin",
"C.",
""
],
[
"Bimbot",
"L.",
""
],
[
"Dubnicka",
"S.",
""
],
[
"Dubnickova",
"A. Z.",
""
],
[
"Tomasi-Gustafsson",
"E.",
""
]
] | The non-relativistic impulse approximation of deuteron electromagnetic form factors is used to investigate the space-like region behavior of the proton electric form factor in regard of the two contradictory experimental results extracted either from Rosenbluth separation method or from recoil proton JLab polarization data. |
hep-ph/0511056 | Dario Zappala | Paolo Castorina, Giuseppe Nardulli, Dario Zappala' | Indications of a Pseudogap in the Nambu Jona-Lasinio model | Contributed to the International Workshop: QCD@Work 2005, Conversano,
Bari, Italy, 16-20 Jun 2005 | null | 10.1063/1.2163776 | null | hep-ph | null | The survival of \bar q q bound states at temperatures higher than the chiral
restoration temperature, T_c, recently observed in lattice QCD, is discussed in
the framework of the Nambu Jona-Lasinio model. The perturbative determination
of the spectral function provides an indication of a pseudogap phase above T_c.
| [
{
"created": "Sat, 5 Nov 2005 16:20:37 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Castorina",
"Paolo",
""
],
[
"Nardulli",
"Giuseppe",
""
],
[
"Zappala'",
"Dario",
""
]
] | The survival of \bar q q bound states at temperatures higher than the chiral restoration temperature, T_c, recently observed in lattice QCD, is discussed in the framework of the Nambu Jona-Lasinio model. The perturbative determination of the spectral function provides an indication of a pseudogap phase above T_c. |
0905.3958 | Shinya Kanemura | Mayumi Aoki, Shinya Kanemura, Osamu Seto | A TeV scale model for neutrino mass, dark matter and baryon asymmetry | 4 pages. 3 figures, talk at Rencontres de Moriond 2009, QCD and High
Energy Interaction, March 14 - 21 (2009), Le Thuile, Italy | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a TeV scale model which would explain neutrino oscillation, dark
matter, and baryon asymmetry of the Universe simultaneously by the dynamics of
the extended Higgs sector and TeV-scale right-handed neutrinos with imposed an
exact $Z_2$ symmetry. Tiny neutrino masses are generated at the three loop
level, a singlet scalar field is a candidate of dark matter, and a strong first
order phase transition is realized for successful electroweak baryogenesis. The
model provides various discriminative predictions, so that it is testable at
the current and future experiments.
| [
{
"created": "Mon, 25 May 2009 07:04:22 GMT",
"version": "v1"
}
] | 2009-05-26 | [
[
"Aoki",
"Mayumi",
""
],
[
"Kanemura",
"Shinya",
""
],
[
"Seto",
"Osamu",
""
]
] | We discuss a TeV scale model which would explain neutrino oscillation, dark matter, and baryon asymmetry of the Universe simultaneously by the dynamics of the extended Higgs sector and TeV-scale right-handed neutrinos with imposed an exact $Z_2$ symmetry. Tiny neutrino masses are generated at the three loop level, a singlet scalar field is a candidate of dark matter, and a strong first order phase transition is realized for successful electroweak baryogenesis. The model provides various discriminative predictions, so that it is testable at the current and future experiments. |
hep-ph/0111185 | Gregory Korchemsky | G.P.Korchemsky, J.Kotanski, A.N.Manashov | Solution of the multi-reggeon compound state problem in multi-colour QCD | 4 pages, Latex style. The title is changed, references added,
acknowledgements extended, typos corrected | Phys.Rev.Lett. 88 (2002) 122002 | 10.1103/PhysRevLett.88.122002 | LPT-Orsay-01-109, TPJU-12/2001, UB-ECM-PF-01/13 | hep-ph cond-mat hep-th nlin.SI | null | We study the properties of the colour-singlet compound states of reggeized
gluons in multi-colour QCD using their relation with noncompact Heisenberg spin
magnets. Applying the methods of integrable models, we calculate their spectrum
and discuss the application of the obtained results to high-energy asymptotics
of the scattering amplitudes in perturbative QCD.
| [
{
"created": "Thu, 15 Nov 2001 10:46:52 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Jan 2002 13:47:12 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Korchemsky",
"G. P.",
""
],
[
"Kotanski",
"J.",
""
],
[
"Manashov",
"A. N.",
""
]
] | We study the properties of the colour-singlet compound states of reggeized gluons in multi-colour QCD using their relation with noncompact Heisenberg spin magnets. Applying the methods of integrable models, we calculate their spectrum and discuss the application of the obtained results to high-energy asymptotics of the scattering amplitudes in perturbative QCD. |
1310.0739 | Christian Weiss | C. Granados, C. Weiss | Transverse charge and magnetization densities in the nucleon's chiral
periphery | 8 pages, 4 figures. Proceedings of QCD Evolution Workshop, Jefferson
Lab, May 6-10, 2013 | null | 10.1142/S2010194514600362 | JLAB-THY-13-1807 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the light-front description of nucleon structure the electromagnetic form
factors are expressed in terms of frame-independent transverse densities of
charge and magnetization. Recent work has studied the transverse densities at
peripheral distances b = O(M_pi^{-1}), where they are governed by universal
chiral dynamics and can be computed in a model-independent manner. Of
particular interest is the comparison of the peripheral charge and
magnetization densities. We summarize (a) their interpretation as
spin-independent and -dependent current matrix elements; (b) the leading-order
chiral effective field theory results; (c) their mechanical interpretation in
the light-front formulation; (d) the large-N_c limit of QCD and the role of
Delta intermediate states; (e) the connection with generalized parton
distributions and peripheral high-energy scattering processes.
| [
{
"created": "Wed, 2 Oct 2013 15:18:15 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Granados",
"C.",
""
],
[
"Weiss",
"C.",
""
]
] | In the light-front description of nucleon structure the electromagnetic form factors are expressed in terms of frame-independent transverse densities of charge and magnetization. Recent work has studied the transverse densities at peripheral distances b = O(M_pi^{-1}), where they are governed by universal chiral dynamics and can be computed in a model-independent manner. Of particular interest is the comparison of the peripheral charge and magnetization densities. We summarize (a) their interpretation as spin-independent and -dependent current matrix elements; (b) the leading-order chiral effective field theory results; (c) their mechanical interpretation in the light-front formulation; (d) the large-N_c limit of QCD and the role of Delta intermediate states; (e) the connection with generalized parton distributions and peripheral high-energy scattering processes. |
hep-ph/0510359 | Aram Kotzinian | A. Kotzinian | Including Cahn and Sivers effects into event generators | Presented at Transversity 2005 workshop, September 7-10, Como, Italy.
8 pages. Word Scientific Proceedings style (included) | null | 10.1142/9789812773272_0027 | null | hep-ph hep-ex | null | It is demonstrated that event generators LEPTO and PYTHIA can be modified to
describe some azimuthal modulations. The comparisons of results obtained with
modified LEPTO with existing data in the current fragmentation region of SIDIS
are presented for Cahn and Sivers effects as well as the predictions for the
target fragmentation region. The predictions for Sivers effect in the
Drell--Yan process obtained with modified PYTHIA are also presented. The
concept of hadronization function is discussed.
| [
{
"created": "Thu, 27 Oct 2005 11:28:57 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Kotzinian",
"A.",
""
]
] | It is demonstrated that event generators LEPTO and PYTHIA can be modified to describe some azimuthal modulations. The comparisons of results obtained with modified LEPTO with existing data in the current fragmentation region of SIDIS are presented for Cahn and Sivers effects as well as the predictions for the target fragmentation region. The predictions for Sivers effect in the Drell--Yan process obtained with modified PYTHIA are also presented. The concept of hadronization function is discussed. |
hep-ph/0304294 | Paul Romatschke | A.Rebhan and P.Romatschke (Vienna, Tech. U.) | HTL quasiparticle models of deconfined QCD at finite chemical potential | 11 pages, 9 figures, RevTeX4; v2: references and 3 plots updated | Phys.Rev. D68 (2003) 025022 | 10.1103/PhysRevD.68.025022 | TUW-03-11 | hep-ph | null | Using quasiparticle models and imposing thermodynamic consistency, lattice
data for the equation of state of deconfined QCD can be mapped to finite
chemical potential. We consider a refinement of existing simple massive
quasiparticle models using the non-local hard-thermal-loop (HTL) propagators,
and certain NLO corrections thereof, to obtain the thermodynamic potential as a
function of temperature and chemical potential. At small chemical potential we
find that the results for the slope of constant pressure from our main model
for 2 massless quark flavors is in good agreement with recent lattice data for
2+1 flavors while it deviates somewhat from lattice data for 2 flavors from
another group. For zero temperature, we obtain an estimate for the critical
chemical potential which is close to that obtained from simpler quasiparticle
models.
| [
{
"created": "Wed, 30 Apr 2003 16:08:12 GMT",
"version": "v1"
},
{
"created": "Fri, 9 May 2003 16:04:29 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Rebhan",
"A.",
"",
"Vienna, Tech. U."
],
[
"Romatschke",
"P.",
"",
"Vienna, Tech. U."
]
] | Using quasiparticle models and imposing thermodynamic consistency, lattice data for the equation of state of deconfined QCD can be mapped to finite chemical potential. We consider a refinement of existing simple massive quasiparticle models using the non-local hard-thermal-loop (HTL) propagators, and certain NLO corrections thereof, to obtain the thermodynamic potential as a function of temperature and chemical potential. At small chemical potential we find that the results for the slope of constant pressure from our main model for 2 massless quark flavors is in good agreement with recent lattice data for 2+1 flavors while it deviates somewhat from lattice data for 2 flavors from another group. For zero temperature, we obtain an estimate for the critical chemical potential which is close to that obtained from simpler quasiparticle models. |
1806.05100 | Dieter Schildknecht | Dieter Schildknecht | The Energy-Dependent Black-Disk Fraction in Proton-Proton Scattering | 7 pages, expanded version, including impact-parameter representation
and other details | Phys. Rev. D 98, 094009 (2018) | 10.1103/PhysRevD.98.094009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent work by Block et al on the energy-invariant edge in proton-proton
scattering is interpreted by quantitatively introducing a energy-dependent
black-disk fraction of the proton-proton interaction.
| [
{
"created": "Wed, 13 Jun 2018 15:08:28 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Jul 2018 13:46:59 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Sep 2018 12:32:44 GMT",
"version": "v3"
}
] | 2018-11-21 | [
[
"Schildknecht",
"Dieter",
""
]
] | Recent work by Block et al on the energy-invariant edge in proton-proton scattering is interpreted by quantitatively introducing a energy-dependent black-disk fraction of the proton-proton interaction. |
hep-ph/0605134 | Sheldon Stone | Sheldon Stone | Hadronic Charm Decays and D Mixing | Inivted talk at "Flavor Physics and CP Violation Conference,"
Vancouver, 2006, 12 pages, 14 figures. To be published Electronic Conference
Proceedings Archive http://www.slac.stanford.edu/econf/search.html | null | null | null | hep-ph hep-ex | null | I discuss new results on absolute branching ratios of charm mesons into
specific exclusive final states, Cabibbo suppressed decay rates, inclusive
decays to $s\bar{s}$ mesons, limits on D^0 anti-D^0 mixing, CP violation and T
violation. Preliminary results from CLEO-c now dominate the world average
absolute branching fractions. For the most important normalization modes
involving D^0 and D^+, the averages are B(D^0 -> K^- pi^+ = (3.87 +/- 0.06)%,
and B(D^+ -> K^- pi^+ pi^+)= (9.12 +/- 0.19)%. For the Ds^+ CLEO-c measures
B(Ds+ -> K^- K^+ pi^+)=(4.54^{+0.44}_{-0.42} =/- 0.25)%. Using this rate, I
derive an effective branching ratio B(eff)(Ds^+ -> phi pi^+)=(3.49 +/- 0.39)%,
that is appropriate for use in extracting other branching fractions that have
often been measured relative to this mode. This number is compared with other
determinations.
| [
{
"created": "Thu, 11 May 2006 16:48:15 GMT",
"version": "v1"
},
{
"created": "Sun, 14 May 2006 17:16:11 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Stone",
"Sheldon",
""
]
] | I discuss new results on absolute branching ratios of charm mesons into specific exclusive final states, Cabibbo suppressed decay rates, inclusive decays to $s\bar{s}$ mesons, limits on D^0 anti-D^0 mixing, CP violation and T violation. Preliminary results from CLEO-c now dominate the world average absolute branching fractions. For the most important normalization modes involving D^0 and D^+, the averages are B(D^0 -> K^- pi^+ = (3.87 +/- 0.06)%, and B(D^+ -> K^- pi^+ pi^+)= (9.12 +/- 0.19)%. For the Ds^+ CLEO-c measures B(Ds+ -> K^- K^+ pi^+)=(4.54^{+0.44}_{-0.42} =/- 0.25)%. Using this rate, I derive an effective branching ratio B(eff)(Ds^+ -> phi pi^+)=(3.49 +/- 0.39)%, that is appropriate for use in extracting other branching fractions that have often been measured relative to this mode. This number is compared with other determinations. |
1905.06047 | Jie Ren | Murat Abdughani, Jie Ren, Lei Wu, Jin Min Yang, Jun Zhao | Supervised deep learning in high energy phenomenology: a mini review | Invited review, 72 pages, 24 figures. References are added | null | 10.1088/0253-6102/71/8/955 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Deep learning, a branch of machine learning, have been recently applied to
high energy experimental and phenomenological studies. In this note we give a
brief review on those applications using supervised deep learning. We first
describe various learning models and then recapitulate their applications to
high energy phenomenological studies. Some detailed applications are delineated
in details, including the machine learning scan in the analysis of new physics
parameter space, the graph neural networks in the search of top-squark
production and in the $CP$ measurement of the top-Higgs coupling at the LHC.
| [
{
"created": "Wed, 15 May 2019 09:26:53 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Jul 2019 08:56:51 GMT",
"version": "v2"
}
] | 2019-09-04 | [
[
"Abdughani",
"Murat",
""
],
[
"Ren",
"Jie",
""
],
[
"Wu",
"Lei",
""
],
[
"Yang",
"Jin Min",
""
],
[
"Zhao",
"Jun",
""
]
] | Deep learning, a branch of machine learning, have been recently applied to high energy experimental and phenomenological studies. In this note we give a brief review on those applications using supervised deep learning. We first describe various learning models and then recapitulate their applications to high energy phenomenological studies. Some detailed applications are delineated in details, including the machine learning scan in the analysis of new physics parameter space, the graph neural networks in the search of top-squark production and in the $CP$ measurement of the top-Higgs coupling at the LHC. |
1308.1435 | Stanley J. Brodsky | James D. Bjorken, Stanley J. Brodsky, Alfred Scharff Goldhaber | Possible multiparticle ridge-like correlations in very high multiplicity
proton-proton collisions | Updated figure. Version to be published in Physics Letters B | null | 10.1016/j.physletb.2013.08.066 | SLAC-PUB-15352 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The CMS collaboration at the LHC has reported a remarkable and unexpected
phenomenon in very high-multiplicity high energy proton-proton collisions: a
positive correlation between two particles produced at similar azimuthal
angles, spanning a large range in rapidity. We suggest that this "ridge"-like
correlation may be a reflection of the rare events generated by the collision
of aligned flux tubes connecting the valence quarks in the wave functions of
the colliding protons. The "spray" of particles resulting from the approximate
line source produced in such inelastic collisions then gives rise to events
with a strong correlation between particles produced over a large range of both
positive and negative rapidity. We suggest an additional variable that is
sensitive to such a line source which is related to a commonly used measure,
ellipticity.
| [
{
"created": "Tue, 6 Aug 2013 22:40:11 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Aug 2013 21:26:16 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Bjorken",
"James D.",
""
],
[
"Brodsky",
"Stanley J.",
""
],
[
"Goldhaber",
"Alfred Scharff",
""
]
] | The CMS collaboration at the LHC has reported a remarkable and unexpected phenomenon in very high-multiplicity high energy proton-proton collisions: a positive correlation between two particles produced at similar azimuthal angles, spanning a large range in rapidity. We suggest that this "ridge"-like correlation may be a reflection of the rare events generated by the collision of aligned flux tubes connecting the valence quarks in the wave functions of the colliding protons. The "spray" of particles resulting from the approximate line source produced in such inelastic collisions then gives rise to events with a strong correlation between particles produced over a large range of both positive and negative rapidity. We suggest an additional variable that is sensitive to such a line source which is related to a commonly used measure, ellipticity. |
1809.07127 | Kai Ma | Kai Ma | Enhancing $CP$ Measurement of the Yukawa Interactions of Top-Quark at
$e^{-}e^{+}$ Collider | 8 pages, 10 figures | Phys. Lett. B 797, 134928(2019) | 10.1016/j.physletb.2019.134928 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that $CP$-violating coupling of the Yukawa interaction of
top-quark is a promising candidate of a new source of $CP$ violation effect.
Precisely measurement of its $CP$ properties is crucial for understanding new
physics above the electroweak scale. In this paper, we introduce a complete
analysis method for probing $CP$ violation effects in the associated production
of top-quark pair and Higgs boson at $e^{-}e^{+}$ collider. Reconstructions of
the top-quarks are not needed in our strategy. The observables are defined
based on spin correlation effects of the leptons emerging from decays of
top-quarks, and their formal expressions are universal at any reference frames.
Two reference frames, the rest frame of the top-quark pair and the rest frame
of Higgs boson, are examined. Importantly, large enhancement effects for both
$CP$-odd and $CP$-even observables are observed in the rest frame of Higgs
boson. This can be essential for probing $CP$ violation effects at future
$e^{-}e^{+}$ collider.
| [
{
"created": "Wed, 19 Sep 2018 11:28:23 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Sep 2019 13:44:19 GMT",
"version": "v2"
}
] | 2019-09-17 | [
[
"Ma",
"Kai",
""
]
] | It is well known that $CP$-violating coupling of the Yukawa interaction of top-quark is a promising candidate of a new source of $CP$ violation effect. Precisely measurement of its $CP$ properties is crucial for understanding new physics above the electroweak scale. In this paper, we introduce a complete analysis method for probing $CP$ violation effects in the associated production of top-quark pair and Higgs boson at $e^{-}e^{+}$ collider. Reconstructions of the top-quarks are not needed in our strategy. The observables are defined based on spin correlation effects of the leptons emerging from decays of top-quarks, and their formal expressions are universal at any reference frames. Two reference frames, the rest frame of the top-quark pair and the rest frame of Higgs boson, are examined. Importantly, large enhancement effects for both $CP$-odd and $CP$-even observables are observed in the rest frame of Higgs boson. This can be essential for probing $CP$ violation effects at future $e^{-}e^{+}$ collider. |
1303.3615 | Stefano Di Chiara | Tommi Alanne, Stefano Di Chiara, Kimmo Tuominen | LHC Data and Aspects of New Physics | 26 pages, 5 figures. Axial-vector added to the analysis in section
IV, conclusions partially change; typos corrected | null | 10.1007/JHEP01(2014)041 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the implications of current LHC data on new physics with strongly
interacting sector(s). We parametrize the relevant interaction Lagrangian and
study the best fit values in light of current data. These are then considered
within a simple framework of bosonic technicolor. We consider first the
effective Lagrangian containing only spin-0 composites of the underlying
theory, which corresponds to a two Higgs doublet model. With respect to this
baseline, the effects of the vector bosons, a staple in strong interacting
theories, are illustrated by considering two cases: first, the case where the
effects of the vector bosons arise only through their mixing with the
electroweak SU(2)_L gauge fields and, second, the case where also a direct
interaction term with neutral scalars exists. We find that the case of a W'
coupling to the Higgs boson only via the mixing of vector fields produces a
negligible improvement in the fit of the present data, while even a small
direct coupling of the composite vector fields to the Higgs allows the tested
model to fit optimally the experimental results.
| [
{
"created": "Thu, 14 Mar 2013 21:14:26 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Apr 2013 19:54:56 GMT",
"version": "v2"
}
] | 2015-06-15 | [
[
"Alanne",
"Tommi",
""
],
[
"Di Chiara",
"Stefano",
""
],
[
"Tuominen",
"Kimmo",
""
]
] | We consider the implications of current LHC data on new physics with strongly interacting sector(s). We parametrize the relevant interaction Lagrangian and study the best fit values in light of current data. These are then considered within a simple framework of bosonic technicolor. We consider first the effective Lagrangian containing only spin-0 composites of the underlying theory, which corresponds to a two Higgs doublet model. With respect to this baseline, the effects of the vector bosons, a staple in strong interacting theories, are illustrated by considering two cases: first, the case where the effects of the vector bosons arise only through their mixing with the electroweak SU(2)_L gauge fields and, second, the case where also a direct interaction term with neutral scalars exists. We find that the case of a W' coupling to the Higgs boson only via the mixing of vector fields produces a negligible improvement in the fit of the present data, while even a small direct coupling of the composite vector fields to the Higgs allows the tested model to fit optimally the experimental results. |
1911.01493 | Oleksandr Tomalak | Richard J. Hill and Oleksandr Tomalak | On the effective theory of neutrino-electron and neutrino-quark
interactions | 18 pages, 1 figure. v2: journal version; minor corrections,
references are added | Phys. Lett. B 805, 135466 (2020) | 10.1016/j.physletb.2020.135466 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We determine the four Fermi effective theory of neutrino interactions within
the Standard Model including one-loop electroweak radiative corrections, in
combination with the measured muon lifetime and precision electroweak data.
Including two-loop matching and three-loop running corrections, we determine
lepton coefficients accounting for all large logarithms through relative order
$\cal{O}(\alpha \alpha_s)$ and quark coefficients accounting for all large
logarithms through ${\cal{O}}(\alpha)$. We present four-fermion coefficients
valid in $n_f=3$ and $n_f=4$ flavor quark theories, as well as in the extreme
low-energy limit. We relate the coefficients in this limit to neutrino charge
radii governing matter effects via forward neutrino scattering on charged
particles.
| [
{
"created": "Mon, 4 Nov 2019 21:18:11 GMT",
"version": "v1"
},
{
"created": "Wed, 13 May 2020 16:45:50 GMT",
"version": "v2"
}
] | 2020-05-14 | [
[
"Hill",
"Richard J.",
""
],
[
"Tomalak",
"Oleksandr",
""
]
] | We determine the four Fermi effective theory of neutrino interactions within the Standard Model including one-loop electroweak radiative corrections, in combination with the measured muon lifetime and precision electroweak data. Including two-loop matching and three-loop running corrections, we determine lepton coefficients accounting for all large logarithms through relative order $\cal{O}(\alpha \alpha_s)$ and quark coefficients accounting for all large logarithms through ${\cal{O}}(\alpha)$. We present four-fermion coefficients valid in $n_f=3$ and $n_f=4$ flavor quark theories, as well as in the extreme low-energy limit. We relate the coefficients in this limit to neutrino charge radii governing matter effects via forward neutrino scattering on charged particles. |
hep-ph/9410272 | null | M.Genovese, N.N.Nikolaev and B.G.Zakharov | Direct calculation of the triple-pomeron coupling for diffractive DIS
and real photoproduction | 14 pages, 1 figure (request from kph154@zam001.zam.kfa-juelich.de),
Juelich preprint KFA-IKP(Th)-1994-36 | J.Exp.Theor.Phys. 81 (1995) 633-637; Zh.Eksp.Teor.Fiz. 108 (1995)
1155-1163 | null | null | hep-ph | null | We present a unified direct calculation of the triple-pomeron coupling
$A_{3\Pom}(Q^{2})$ for diffractive real photoproduction ($Q^{2}=0$) and deep
inelastic scattering at large $Q^{2}$ in the framework of the dipole approach
to the generalized BFKL pomeron. The small phenomenological value of
$A_{3\Pom}(0)\approx 0.16$\,GeV$^{2}$, which was a mystery, is related to the
small correlation radius $R_{c}\approx 0.3$\,fm for the perturbative gluons. We
confirm the early expectations of weak $Q^{2}$ dependence of the dimensionfull
coupling $A_{3\Pom}(Q^{2})$ and predict that it rises by the factor $\sim 1.6$
from real photoproduction to deep inelastic scattering.
| [
{
"created": "Wed, 12 Oct 1994 20:13:45 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Genovese",
"M.",
""
],
[
"Nikolaev",
"N. N.",
""
],
[
"Zakharov",
"B. G.",
""
]
] | We present a unified direct calculation of the triple-pomeron coupling $A_{3\Pom}(Q^{2})$ for diffractive real photoproduction ($Q^{2}=0$) and deep inelastic scattering at large $Q^{2}$ in the framework of the dipole approach to the generalized BFKL pomeron. The small phenomenological value of $A_{3\Pom}(0)\approx 0.16$\,GeV$^{2}$, which was a mystery, is related to the small correlation radius $R_{c}\approx 0.3$\,fm for the perturbative gluons. We confirm the early expectations of weak $Q^{2}$ dependence of the dimensionfull coupling $A_{3\Pom}(Q^{2})$ and predict that it rises by the factor $\sim 1.6$ from real photoproduction to deep inelastic scattering. |
2207.03606 | Filip Bergabo | Filip Bergabo and Jamal Jalilian-Marian | One-Loop Corrections to Dihadron Production in DIS at Small $x$ | 28 pages, 3 figures | null | 10.1103/PhysRevD.106.054035 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | We calculate the one-loop corrections to dihadron production in Deep
Inelastic Scattering (DIS) at small x using the Color Glass Condensate
formalism. We show that all UV and soft singularities cancel while the
collinear divergences are absorbed into quark and anti quark-hadron
fragmentation functions. Rapidity divergences lead to JIMWLK evolution of
dipoles and quadrupoles describing multiple-scatterings of the quark anti-quark
dipole on the target proton/nucleus. The resulting cross section is finite and
can be used for phenomenological studies of dihadron angular correlations at
small x in a future Electron-Ion Collider (EIC).
| [
{
"created": "Thu, 7 Jul 2022 22:33:24 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Oct 2022 21:07:54 GMT",
"version": "v2"
}
] | 2022-10-12 | [
[
"Bergabo",
"Filip",
""
],
[
"Jalilian-Marian",
"Jamal",
""
]
] | We calculate the one-loop corrections to dihadron production in Deep Inelastic Scattering (DIS) at small x using the Color Glass Condensate formalism. We show that all UV and soft singularities cancel while the collinear divergences are absorbed into quark and anti quark-hadron fragmentation functions. Rapidity divergences lead to JIMWLK evolution of dipoles and quadrupoles describing multiple-scatterings of the quark anti-quark dipole on the target proton/nucleus. The resulting cross section is finite and can be used for phenomenological studies of dihadron angular correlations at small x in a future Electron-Ion Collider (EIC). |
1603.05468 | Markus Diehl | Markus Diehl, Jonathan R. Gaunt | Double parton scattering in the ultraviolet: addressing the double
counting problem | 5 pages, 3 figures. To appear in the proeceedings of MPI@LHC 2015,
Trieste, Italy, 23-27 November 2015 | null | null | DESY 16-048 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In proton-proton collisions there is a smooth transition between the regime
of double parton scattering, initiated by two pairs of partons at a large
relative distance, and the regime where a single parton splits into a parton
pair in one or both protons. We present a scheme for computing both
contributions in a consistent and practicable way.
| [
{
"created": "Thu, 17 Mar 2016 13:10:09 GMT",
"version": "v1"
}
] | 2016-03-18 | [
[
"Diehl",
"Markus",
""
],
[
"Gaunt",
"Jonathan R.",
""
]
] | In proton-proton collisions there is a smooth transition between the regime of double parton scattering, initiated by two pairs of partons at a large relative distance, and the regime where a single parton splits into a parton pair in one or both protons. We present a scheme for computing both contributions in a consistent and practicable way. |
1603.02915 | Xiao-Gang He | Xiao-Gang He, Pyungwon Ko | Flavor $SU(3)$ properties of beauty tetraquark states with three
different light quarks | RevTex, 14 pages. Title changed and contents expanded | null | 10.1016/j.physletb.2016.08.005 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Beauty tetraquark states $X(\bar b q'q'' \bar q )$ composed of $ \bar b s u
\bar d$, $\bar b d s \bar u$, and $\bar b u d \bar s$, are unique that all the
four valence quarks are different. Although the claim of existence of the first
two states by D0 was not confirmed by data from LHCb, the possibility of such
states still generated a lot of interests and should be pursued further.
Non-observation of $X(\bar b q'q'' \bar q )$ states by LHCb may be just due to
a still lower production rate than the limit of LHCb or at some different mass
ranges. In this work we use light quark $SU(3)$ flavor symmetry as guideline to
classify symmetry properties of beauty tetraquark states. The multiplets which
contain states with three different light quarks must be one of ${\bf \bar 6}$
or ${\bf 15}$ of $SU(3)$ representations. We study possible decays of such a
tetraquark state into a $B$ meson and a light pesudoscalar octet meson by
constructing a leading order chiral Lagrangian, and also provide search
strategies to determine whether a given tetraquark state of this type belongs
to ${\bf \bar 6}$ or ${\bf 15}$. If $X(\bar b q'q''\bar q )$ belongs to ${\bf
15}$, there are new doubly charged tetraquark states $\bar b u u \bar d$ and
$\bar b u u \bar s$.
| [
{
"created": "Wed, 9 Mar 2016 15:13:56 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Mar 2016 11:14:21 GMT",
"version": "v2"
},
{
"created": "Sun, 15 May 2016 13:33:18 GMT",
"version": "v3"
}
] | 2016-09-21 | [
[
"He",
"Xiao-Gang",
""
],
[
"Ko",
"Pyungwon",
""
]
] | Beauty tetraquark states $X(\bar b q'q'' \bar q )$ composed of $ \bar b s u \bar d$, $\bar b d s \bar u$, and $\bar b u d \bar s$, are unique that all the four valence quarks are different. Although the claim of existence of the first two states by D0 was not confirmed by data from LHCb, the possibility of such states still generated a lot of interests and should be pursued further. Non-observation of $X(\bar b q'q'' \bar q )$ states by LHCb may be just due to a still lower production rate than the limit of LHCb or at some different mass ranges. In this work we use light quark $SU(3)$ flavor symmetry as guideline to classify symmetry properties of beauty tetraquark states. The multiplets which contain states with three different light quarks must be one of ${\bf \bar 6}$ or ${\bf 15}$ of $SU(3)$ representations. We study possible decays of such a tetraquark state into a $B$ meson and a light pesudoscalar octet meson by constructing a leading order chiral Lagrangian, and also provide search strategies to determine whether a given tetraquark state of this type belongs to ${\bf \bar 6}$ or ${\bf 15}$. If $X(\bar b q'q''\bar q )$ belongs to ${\bf 15}$, there are new doubly charged tetraquark states $\bar b u u \bar d$ and $\bar b u u \bar s$. |
1403.1290 | Asimina Arvanitaki | Asimina Arvanitaki, and Andrew A. Geraci | Resonant detection of axion mediated forces with Nuclear Magnetic
Resonance | 6 pages, 3 figures, 1 table, submitted to PRL | Phys. Rev. Lett. 113, 161801 (2014) | 10.1103/PhysRevLett.113.161801 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a method based on precision magnetometry that can extend the
search for axion-mediated spin-dependent forces by several orders of magnitude.
By combining techniques used in nuclear magnetic resonance and short-distance
tests of gravity, our approach can substantially improve upon current
experimental limits set by astrophysics, and probe deep into the theoretically
interesting regime for the Peccei-Quinn (PQ) axion. Our method is sensitive to
PQ axion decay constants between 10^9 and 10^12 GeV or axion masses between
10^-6 and 10^-3 eV, independent of the cosmic axion abundance.
| [
{
"created": "Wed, 5 Mar 2014 22:52:59 GMT",
"version": "v1"
}
] | 2014-10-22 | [
[
"Arvanitaki",
"Asimina",
""
],
[
"Geraci",
"Andrew A.",
""
]
] | We describe a method based on precision magnetometry that can extend the search for axion-mediated spin-dependent forces by several orders of magnitude. By combining techniques used in nuclear magnetic resonance and short-distance tests of gravity, our approach can substantially improve upon current experimental limits set by astrophysics, and probe deep into the theoretically interesting regime for the Peccei-Quinn (PQ) axion. Our method is sensitive to PQ axion decay constants between 10^9 and 10^12 GeV or axion masses between 10^-6 and 10^-3 eV, independent of the cosmic axion abundance. |
2308.04822 | Xingjuan Li | Zhaoxia Heng, Xingjuan Li, Liangliang Shang | Properties of Heavy Higgs Bosons and Dark Matter under Current
Experimental Limits in the $\mu$NMSSM | null | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Searches for new particles beyond the Standard Model (SM) are an important
task for the Large Hadron Collider (LHC). In this paper, we investigate the
properties of the heavy non-SM Higgs bosons in the $\mu$-term extended
Next-to-Minimal Supersymmetric Standard Model ($\mu$NMSSM). We scan the
parameter space of the $\mu$NMSSM considering the basic constraints from Higgs
data, dark matter (DM) relic density, and LHC searches for sparticles. And we
also consider the constraints from the LZ2022 experiment and the muon anomaly
constraint at 2$\sigma$ level.
We find that the LZ2022 experiment has a strict constraint on the parameter
space of the $\mu$NMSSM, and the limits from the DM-nucleon spin-independent
(SI) and spin-dependent (SD) cross-sections are complementary. Then we discuss
the exotic decay modes of heavy Higgs bosons decaying into SM-like Higgs boson.
We find that for doublet-dominated Higgs $h_3$ and $A_2$, the main exotic decay
channels are $h_3\rightarrow Z A_1$, $h_3\rightarrow h_1 h_2$, $A_2\rightarrow
A_1 h_1$ and $A_2\rightarrow Z h_2$, and the branching ratio can reach to about
23$\%$, 10$\%$, 35$\%$ and 10$\%$ respectively. At the 13 TeV LHC, the
production cross-section of $ggF\rightarrow h_3\rightarrow h_1 h_2$ and
$ggF\rightarrow A_2\rightarrow A_1 h_1$ can reach to about $10^{-11}$pb and
$10^{-10}$pb, respectively.
| [
{
"created": "Wed, 9 Aug 2023 09:22:50 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Aug 2023 10:57:59 GMT",
"version": "v2"
}
] | 2023-08-17 | [
[
"Heng",
"Zhaoxia",
""
],
[
"Li",
"Xingjuan",
""
],
[
"Shang",
"Liangliang",
""
]
] | Searches for new particles beyond the Standard Model (SM) are an important task for the Large Hadron Collider (LHC). In this paper, we investigate the properties of the heavy non-SM Higgs bosons in the $\mu$-term extended Next-to-Minimal Supersymmetric Standard Model ($\mu$NMSSM). We scan the parameter space of the $\mu$NMSSM considering the basic constraints from Higgs data, dark matter (DM) relic density, and LHC searches for sparticles. And we also consider the constraints from the LZ2022 experiment and the muon anomaly constraint at 2$\sigma$ level. We find that the LZ2022 experiment has a strict constraint on the parameter space of the $\mu$NMSSM, and the limits from the DM-nucleon spin-independent (SI) and spin-dependent (SD) cross-sections are complementary. Then we discuss the exotic decay modes of heavy Higgs bosons decaying into SM-like Higgs boson. We find that for doublet-dominated Higgs $h_3$ and $A_2$, the main exotic decay channels are $h_3\rightarrow Z A_1$, $h_3\rightarrow h_1 h_2$, $A_2\rightarrow A_1 h_1$ and $A_2\rightarrow Z h_2$, and the branching ratio can reach to about 23$\%$, 10$\%$, 35$\%$ and 10$\%$ respectively. At the 13 TeV LHC, the production cross-section of $ggF\rightarrow h_3\rightarrow h_1 h_2$ and $ggF\rightarrow A_2\rightarrow A_1 h_1$ can reach to about $10^{-11}$pb and $10^{-10}$pb, respectively. |
hep-ph/0110228 | Malgorzata Worek | Malgorzata Worek (University of Silesia) | Tau Polarisation and its Correlations as a Signal for Higgs Bosons -
Universal Spin Interface for TAUOLA Package | 9 pages, 10 figs, Presented at the XXV International School of
Theoretical Physics "Particles and Astrophysics - Standard Models and Beyond"
Ustron, Poland, September 10-16, 2001 | Acta Phys.Polon.B32:3803-3811,2001 | null | null | hep-ph | null | We show how the tau+ tau- spin correlations can be used to improve the
recognition of the parent boson spin, and hence to identify scalar boson H -->
tau+ tau- events from the vector boson Z\gamma --> tau+ tau- background in high
energy accelerator experiments.
| [
{
"created": "Wed, 17 Oct 2001 10:40:23 GMT",
"version": "v1"
}
] | 2011-03-17 | [
[
"Worek",
"Malgorzata",
"",
"University of Silesia"
]
] | We show how the tau+ tau- spin correlations can be used to improve the recognition of the parent boson spin, and hence to identify scalar boson H --> tau+ tau- events from the vector boson Z\gamma --> tau+ tau- background in high energy accelerator experiments. |
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