id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2305.04845 | Markus Diehl | Markus Diehl, Riccardo Nagar, Peter Ploessl, Frank J. Tackmann | Evolution and interpolation of double parton distributions using
Chebyshev grids | 48 pages, 17 figures. v2: added figure 3, added clarifications,
corrected typos | null | 10.1140/epjc/s10052-023-11692-8 | DESY 23-062 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Double parton distributions are the nonperturbative ingredients needed for
computing double parton scattering processes in hadron-hadron collisions. They
describe a variety of correlations between two partons in a hadron and depend
on a large number of variables, including two independent renormalization
scales. This makes it challenging to compute their scale evolution with
satisfactory numerical accuracy while keeping computational costs at a
manageable level. We show that this problem can be solved using interpolation
on Chebyshev grids, extending the methods we previously developed for ordinary
single-parton distributions. Using an implementation of these methods in the
C++ library ChiliPDF, we study for the first time the evolution of double
parton distributions beyond leading order in perturbation theory.
| [
{
"created": "Mon, 8 May 2023 16:43:15 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jun 2023 06:39:19 GMT",
"version": "v2"
}
] | 2023-07-12 | [
[
"Diehl",
"Markus",
""
],
[
"Nagar",
"Riccardo",
""
],
[
"Ploessl",
"Peter",
""
],
[
"Tackmann",
"Frank J.",
""
]
] | Double parton distributions are the nonperturbative ingredients needed for computing double parton scattering processes in hadron-hadron collisions. They describe a variety of correlations between two partons in a hadron and depend on a large number of variables, including two independent renormalization scales. This makes it challenging to compute their scale evolution with satisfactory numerical accuracy while keeping computational costs at a manageable level. We show that this problem can be solved using interpolation on Chebyshev grids, extending the methods we previously developed for ordinary single-parton distributions. Using an implementation of these methods in the C++ library ChiliPDF, we study for the first time the evolution of double parton distributions beyond leading order in perturbation theory. |
1306.6460 | Fen Zuo | Pietro Colangelo, Juan Jose Sanz-Cillero, Fen Zuo | Large-distance properties of holographic baryons | 20 pages, no figure | null | 10.1016/j.nuclphysb.2013.07.011 | BARI-TH/2013-676, FTUAM-13-13, IFT-UAM/CSIC-13-070 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Employing the asymptotic instanton solution in an arbitrary background of a
set of holographic QCD models, we show that baryon form factors have a precise
large-distance behaviour regardless of the background. The dependence coincides
with that obtained from general chiral soliton models and large-$N_C$ chiral
perturbation theory. The nonlinear terms in the equations of motion are
necessary to recover the correct results. We also show that the holographic
currents have the right structure at low energy if the solutions of the full
equation of motion, instead of the linearized ones, are used. The indication is
that in this holographic approach, the linearized approximation used in the
meson sector is not appropriate for the solitonic description of the baryons.
| [
{
"created": "Thu, 27 Jun 2013 10:29:15 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Colangelo",
"Pietro",
""
],
[
"Sanz-Cillero",
"Juan Jose",
""
],
[
"Zuo",
"Fen",
""
]
] | Employing the asymptotic instanton solution in an arbitrary background of a set of holographic QCD models, we show that baryon form factors have a precise large-distance behaviour regardless of the background. The dependence coincides with that obtained from general chiral soliton models and large-$N_C$ chiral perturbation theory. The nonlinear terms in the equations of motion are necessary to recover the correct results. We also show that the holographic currents have the right structure at low energy if the solutions of the full equation of motion, instead of the linearized ones, are used. The indication is that in this holographic approach, the linearized approximation used in the meson sector is not appropriate for the solitonic description of the baryons. |
hep-ph/0501176 | Dmitri Melikhov | Dmitri Melikhov | A narrow "peanut" pentaquark | Talk given at the Conference "Quark Confinement and Hadron Spectrum
VI", Villasimius (Cagliari) Sardinia, Italy, 21 - 25 September 2004 | null | 10.1063/1.1920948 | null | hep-ph | null | We analyse the decay $\Theta_s(1/2^+)\to NK$ in a non-relativistic Fock space
description using three and five constituent quarks for the nucleon and the
pentaquark, respectively. Following Jaffe and Wilczek \cite{jw}, we assume that
quark-quark correlations in spin-zero state play an important role for the
pentaquark internal structure. Within this scenario, a strong dynamical
suppression of the decay width is shown to be possible only if the pentaquark
has an asymmetric "peanut" structure with the strange antiquark in the center
and the two extended composite diquarks rotating around. In this case a decay
width of $\simeq$ 1 MeV may be a natural possibility.
| [
{
"created": "Wed, 19 Jan 2005 15:32:33 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Melikhov",
"Dmitri",
""
]
] | We analyse the decay $\Theta_s(1/2^+)\to NK$ in a non-relativistic Fock space description using three and five constituent quarks for the nucleon and the pentaquark, respectively. Following Jaffe and Wilczek \cite{jw}, we assume that quark-quark correlations in spin-zero state play an important role for the pentaquark internal structure. Within this scenario, a strong dynamical suppression of the decay width is shown to be possible only if the pentaquark has an asymmetric "peanut" structure with the strange antiquark in the center and the two extended composite diquarks rotating around. In this case a decay width of $\simeq$ 1 MeV may be a natural possibility. |
hep-ph/9502293 | null | Gad Eilam, Michael Gronau and Roberto R. Mendel | Large CP Asymmetries in $B^{\pm}\to\eta_c(\chi_{c0})\pi^{\pm}$ from
$\eta_c(\chi_{c0})$ Width | 12 pages | Phys.Rev.Lett.74:4984-4987,1995 | 10.1103/PhysRevLett.74.4984 | null | hep-ph | null | We study CP asymmetries in $B^{\pm}\to h\pi^{\pm}$ decays, where the hadronic
states $h=\rho\rho, K\Kbar\pi$, $\pi^+\pi^-K^+K^-$, etc., and $h=\pi^+\pi^-,
K^+K^-, 2(\pi^+\pi^-)$, etc., are taken on the resonances $\eta_c$ and
$\chi_{c0}$, respectively. The relatively large $\eta_c$ and $\chi_{c0}$ decay
widths, of about 10$-$15 MeV, provide the necessary absorptive phase in the
interference between the resonance (going through $b\to c\cbar d$) and the
background (through $b\to u\ubar d$) contributions to the amplitude. Large
asymmetries of order 10$\%$ or more are likely in some modes.
| [
{
"created": "Tue, 14 Feb 1995 08:51:38 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Eilam",
"Gad",
""
],
[
"Gronau",
"Michael",
""
],
[
"Mendel",
"Roberto R.",
""
]
] | We study CP asymmetries in $B^{\pm}\to h\pi^{\pm}$ decays, where the hadronic states $h=\rho\rho, K\Kbar\pi$, $\pi^+\pi^-K^+K^-$, etc., and $h=\pi^+\pi^-, K^+K^-, 2(\pi^+\pi^-)$, etc., are taken on the resonances $\eta_c$ and $\chi_{c0}$, respectively. The relatively large $\eta_c$ and $\chi_{c0}$ decay widths, of about 10$-$15 MeV, provide the necessary absorptive phase in the interference between the resonance (going through $b\to c\cbar d$) and the background (through $b\to u\ubar d$) contributions to the amplitude. Large asymmetries of order 10$\%$ or more are likely in some modes. |
hep-ph/9710495 | null | Andreas Blumhofer, Richard Dawid and Johannes Manus | Higher Dimensional Operators in Top Condensation from a Renormalization
Group Point of View | 21 pages, latex2e, axodraw.sty, epsfig.sty, 4 postscript figures.
Some of the discussions extended and clarified | Phys.Rev. D58 (1998) 035009 | 10.1103/PhysRevD.58.035009 | LMU-12/97, UWTHPH-1997-36, TUM-HEP-294/97 | hep-ph | null | The predictive power of top-condensation models strongly depends on the
behaviour of higher dimensional operators. These are analyzed in this paper by
an extension of the standard renormalization group (RG) arguments which turns
out to be a surprisingly powerful tool. Top-condensation models intermediated
by underlying scalar exchange can be shown to be mere reparametrizations of the
standard model. Further on, RG-arguments show that dynamical vector states
cannot be lowered in top-condensation models. Finally we give a general
argument concerning the size of higher dimensional operators of heavy vector
exchange.
| [
{
"created": "Tue, 28 Oct 1997 10:28:46 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Apr 1998 14:10:59 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Blumhofer",
"Andreas",
""
],
[
"Dawid",
"Richard",
""
],
[
"Manus",
"Johannes",
""
]
] | The predictive power of top-condensation models strongly depends on the behaviour of higher dimensional operators. These are analyzed in this paper by an extension of the standard renormalization group (RG) arguments which turns out to be a surprisingly powerful tool. Top-condensation models intermediated by underlying scalar exchange can be shown to be mere reparametrizations of the standard model. Further on, RG-arguments show that dynamical vector states cannot be lowered in top-condensation models. Finally we give a general argument concerning the size of higher dimensional operators of heavy vector exchange. |
2112.06800 | Dmitry Gorbunov | Dmitry Gorbunov, Igor Krasnov, Sergey Suvorov | Revisiting PS191 limits on sterile neutrinos | 10 pages, 6 figures; v2: replaced with the journal version | null | 10.1016/j.physletb.2022.137173 | INR-TH-2021-024 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We perform Monte Carlo simulations of the sterile neutrino signal at the
fixed target experiment PS191 operated on a proton beam of 19.2\,GeV at CERN in
the eighties. We find that the strongest bounds the PS191 could obtain are
significantly lower than what they published, and now are obsolete being
surpassed by recent T2K, NA62, E949, TRIUMF and PIENU experiments.
| [
{
"created": "Mon, 13 Dec 2021 16:59:28 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jun 2022 05:55:24 GMT",
"version": "v2"
}
] | 2022-06-15 | [
[
"Gorbunov",
"Dmitry",
""
],
[
"Krasnov",
"Igor",
""
],
[
"Suvorov",
"Sergey",
""
]
] | We perform Monte Carlo simulations of the sterile neutrino signal at the fixed target experiment PS191 operated on a proton beam of 19.2\,GeV at CERN in the eighties. We find that the strongest bounds the PS191 could obtain are significantly lower than what they published, and now are obsolete being surpassed by recent T2K, NA62, E949, TRIUMF and PIENU experiments. |
hep-ph/0702069 | Ken Intriligator | Kenneth Intriligator, Nathan Seiberg | Lectures on Supersymmetry Breaking | 47 pages. v2: minor corrections | Class.Quant.Grav.24:S741-S772,2007 | 10.1088/0264-9381/24/21/S02 | UCSD-PTH-07-02 | hep-ph hep-th | null | We review the subject of spontaneous supersymmetry breaking. First we
consider supersymmetry breaking in a semiclassical theory. We illustrate it
with several examples, demonstrating different phenomena, including metastable
supersymmetry breaking. Then we give a brief review of the dynamics of
supersymmetric gauge theories. Finally, we use this dynamics to present various
mechanisms for dynamical supersymmetry breaking. These notes are based on
lectures given by the authors in 2007, at various schools.
| [
{
"created": "Tue, 6 Feb 2007 22:33:53 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Apr 2007 20:32:24 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Apr 2007 19:45:36 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Intriligator",
"Kenneth",
""
],
[
"Seiberg",
"Nathan",
""
]
] | We review the subject of spontaneous supersymmetry breaking. First we consider supersymmetry breaking in a semiclassical theory. We illustrate it with several examples, demonstrating different phenomena, including metastable supersymmetry breaking. Then we give a brief review of the dynamics of supersymmetric gauge theories. Finally, we use this dynamics to present various mechanisms for dynamical supersymmetry breaking. These notes are based on lectures given by the authors in 2007, at various schools. |
1909.13787 | Valery Lyubovitskij | Igor T. Obukhovsky, Amand Faessler, Dimitry K. Fedorov, Thomas
Gutsche, Valery E. Lyubovitskij | Transition form factors and helicity amplitudes for electroexcitation of
negative- and positive parity nucleon resonances in a light-front quark model | 18 pages | Phys. Rev. D 100, 094013 (2019) | 10.1103/PhysRevD.100.094013 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A workable basis of quark configurations $s^3$, $s^2p$ and $sp^2$ at light
front has been constructed to describe the high-$Q^2$ behavior of transition
form factors and helicity amplitudes in the electroproduction of the lightest
nucleon resonances, $N_{1/2^-}(1535)$ and $N_{1/2^+}(1440)$. High-quality data
of the CLAS Collaboration are described in the framework of a model which takes
into account mixing of the quark configurations and the hadron-molecular
states. The model allows for a rough estimate of the quark core weight in the
wave function of the resonance in a comparison with high momentum transfer data
on resonance electroproduction.
| [
{
"created": "Mon, 30 Sep 2019 15:29:40 GMT",
"version": "v1"
}
] | 2019-11-20 | [
[
"Obukhovsky",
"Igor T.",
""
],
[
"Faessler",
"Amand",
""
],
[
"Fedorov",
"Dimitry K.",
""
],
[
"Gutsche",
"Thomas",
""
],
[
"Lyubovitskij",
"Valery E.",
""
]
] | A workable basis of quark configurations $s^3$, $s^2p$ and $sp^2$ at light front has been constructed to describe the high-$Q^2$ behavior of transition form factors and helicity amplitudes in the electroproduction of the lightest nucleon resonances, $N_{1/2^-}(1535)$ and $N_{1/2^+}(1440)$. High-quality data of the CLAS Collaboration are described in the framework of a model which takes into account mixing of the quark configurations and the hadron-molecular states. The model allows for a rough estimate of the quark core weight in the wave function of the resonance in a comparison with high momentum transfer data on resonance electroproduction. |
2010.00329 | Jan Nemchik | Michal Krelina and Jan Nemchik | D-wave effects in heavy quarkonium production in ultraperipheral nuclear
collisions | 13 pages including 4 figures and 1 table. The version for
resubmission to Physical Review D. arXiv admin note: text overlap with
arXiv:2008.05116 | Phys. Rev. D 102, 114033 (2020) | 10.1103/PhysRevD.102.114033 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $D$-wave admixture in quarkonium wave functions is acquired from the
photonlike structure of $V\to Q\bar Q$ transition in the light-front frame
widely used in the literature. Such a $D$-wave ballast is not justified by any
nonrelativistic model for $Q-\bar Q$ interaction potential and leads to
falsified predictions for the cross sections in heavy quarkonium production in
ultra-peripheral nuclear collisions. We analyze this negative role of $D$-wave
contribution by comparing with our previous studies based on a simple
non-photon-like "$S$-wave-only" $V\to Q\bar Q$ transition in the $Q\bar Q$ rest
frame.
| [
{
"created": "Wed, 30 Sep 2020 12:03:10 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Oct 2020 07:47:28 GMT",
"version": "v2"
},
{
"created": "Wed, 9 Dec 2020 09:10:22 GMT",
"version": "v3"
}
] | 2021-01-04 | [
[
"Krelina",
"Michal",
""
],
[
"Nemchik",
"Jan",
""
]
] | The $D$-wave admixture in quarkonium wave functions is acquired from the photonlike structure of $V\to Q\bar Q$ transition in the light-front frame widely used in the literature. Such a $D$-wave ballast is not justified by any nonrelativistic model for $Q-\bar Q$ interaction potential and leads to falsified predictions for the cross sections in heavy quarkonium production in ultra-peripheral nuclear collisions. We analyze this negative role of $D$-wave contribution by comparing with our previous studies based on a simple non-photon-like "$S$-wave-only" $V\to Q\bar Q$ transition in the $Q\bar Q$ rest frame. |
hep-ph/0511072 | Muge Boz | Muge Boz | The Higgs Sector and electron electric dipole moment in next-to-minimal
supersymmetry with explicit CP violation | 20 pages, 16 figures | Mod.Phys.Lett. A21 (2006) 243-264 | 10.1142/S021773230601855X | null | hep-ph | null | We study the explicit CP violation of the Higgs sector in the
next--to--minimal supersymmetric model with a gauge singlet Higgs field. Our
numerical predictions show that electric dipole moment of electron lies around
the present experimental upper limits. The mass of the lightest Higgs boson is
quite sensitive to the CP violating phases in the theory. It is observed that
as the vacuum expectation value of the singlet gets higher values, CP violation
increases.
| [
{
"created": "Mon, 7 Nov 2005 13:43:59 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Boz",
"Muge",
""
]
] | We study the explicit CP violation of the Higgs sector in the next--to--minimal supersymmetric model with a gauge singlet Higgs field. Our numerical predictions show that electric dipole moment of electron lies around the present experimental upper limits. The mass of the lightest Higgs boson is quite sensitive to the CP violating phases in the theory. It is observed that as the vacuum expectation value of the singlet gets higher values, CP violation increases. |
2308.13003 | Teppei Kitahara | Teppei Kitahara, Kohsaku Tobioka | MeV Sterile Neutrino in light of the Cabibbo-Angle Anomaly | 11 pages, 3 figures; v2: references added; v3: matches version
published in PRD | Phys.Rev.D 108 (2023) 11, 115034 | 10.1103/PhysRevD.108.115034 | KEK-TH-2544 | hep-ph hep-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | A modified neutrino sector could imprint a signature on precision
measurements of the quark sector because many such measurements rely on the
semi-leptonic decays of the charged currents. Currently, global fits of the
determinations of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements point to
a $3\sigma$-level deficit in the first-row CKM unitarity test, commonly
referred to as the Cabibbo-angle anomaly. We find that a MeV sterile neutrino
that mixes with the electron-type neutrino increases the extracted $|V_{ud}|$,
accommodating the Cabibbo-angle anomaly. This MeV sterile neutrino affects the
superallowed nuclear $\beta$ decays and neutron decay, but it barely modifies
the other measurements of the CKM elements. While various constraints may apply
to such a sterile neutrino, we present viable scenarios within an extension of
the inverse seesaw model.
| [
{
"created": "Thu, 24 Aug 2023 18:07:09 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Sep 2023 08:34:43 GMT",
"version": "v2"
},
{
"created": "Tue, 19 Dec 2023 08:33:40 GMT",
"version": "v3"
}
] | 2023-12-29 | [
[
"Kitahara",
"Teppei",
""
],
[
"Tobioka",
"Kohsaku",
""
]
] | A modified neutrino sector could imprint a signature on precision measurements of the quark sector because many such measurements rely on the semi-leptonic decays of the charged currents. Currently, global fits of the determinations of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements point to a $3\sigma$-level deficit in the first-row CKM unitarity test, commonly referred to as the Cabibbo-angle anomaly. We find that a MeV sterile neutrino that mixes with the electron-type neutrino increases the extracted $|V_{ud}|$, accommodating the Cabibbo-angle anomaly. This MeV sterile neutrino affects the superallowed nuclear $\beta$ decays and neutron decay, but it barely modifies the other measurements of the CKM elements. While various constraints may apply to such a sterile neutrino, we present viable scenarios within an extension of the inverse seesaw model. |
1703.00451 | Aaron C. Vincent | Carlos A. Arg\"uelles, Ali Kheirandish, Aaron C. Vincent | Imaging Galactic Dark Matter with High-Energy Cosmic Neutrinos | 8 pages, 4 figures. Added cross section expressions in appendix by
popular request | Phys. Rev. Lett. 119, 201801 (2017) | 10.1103/PhysRevLett.119.201801 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the high-energy cosmic neutrinos seen by the IceCube Neutrino
Observatory can be used to probe interactions between neutrinos and the dark
sector that cannot be reached by current cosmological methods. The origin of
the observed neutrinos is still unknown, and their arrival directions are
compatible with an isotropic distribution. This observation, together with
dedicated studies of Galactic plane correlations, suggest a predominantly
extragalactic origin. Interactions between this isotropic extragalactic flux
and the dense dark matter (DM) bulge of the Milky Way would thus lead to an
observable imprint on the distribution, which would be seen by IceCube as 1)
slightly suppressed fluxes at energies below a PeV and 2) a deficit of events
in the direction of the Galactic center. We perform an extended unbinned
likelihood analysis using the four-year high-energy starting event dataset to
constrain the strength of DM-neutrino interactions for two model classes. We
find that, in spite of low statistics, IceCube can probe regions of the
parameter space inaccessible to current cosmological methods.
| [
{
"created": "Wed, 1 Mar 2017 19:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Sep 2017 16:22:37 GMT",
"version": "v2"
},
{
"created": "Fri, 5 Mar 2021 21:44:52 GMT",
"version": "v3"
}
] | 2021-03-09 | [
[
"Argüelles",
"Carlos A.",
""
],
[
"Kheirandish",
"Ali",
""
],
[
"Vincent",
"Aaron C.",
""
]
] | We show that the high-energy cosmic neutrinos seen by the IceCube Neutrino Observatory can be used to probe interactions between neutrinos and the dark sector that cannot be reached by current cosmological methods. The origin of the observed neutrinos is still unknown, and their arrival directions are compatible with an isotropic distribution. This observation, together with dedicated studies of Galactic plane correlations, suggest a predominantly extragalactic origin. Interactions between this isotropic extragalactic flux and the dense dark matter (DM) bulge of the Milky Way would thus lead to an observable imprint on the distribution, which would be seen by IceCube as 1) slightly suppressed fluxes at energies below a PeV and 2) a deficit of events in the direction of the Galactic center. We perform an extended unbinned likelihood analysis using the four-year high-energy starting event dataset to constrain the strength of DM-neutrino interactions for two model classes. We find that, in spite of low statistics, IceCube can probe regions of the parameter space inaccessible to current cosmological methods. |
hep-ph/0211226 | Gorazd Cvetic | Gorazd Cvetic (UTFSM, Valparaiso) | Infrared renormalons and analyticity structure in pQCD | 6 pages, revtex4, 1 eps-figure; improved version - the paragraph
containing Eqs.(18) and (19) is new, as well as the next paragraph; the Title
modified; some references added; version to appear in Phys. Rev. D | Phys.Rev. D67 (2003) 074022 | 10.1103/PhysRevD.67.074022 | USM-TH-134 | hep-ph | null | Relation between the infrared renormalons, the Borel resummation
prescriptions, and the analyticity structure of Green functions in perturbative
QCD (pQCD) is investigated. A specific recently suggested Borel resummation
prescription resulted in the Principal Value and an additional power-suppressed
correction that is consistent with the Operator Product Expansion. Arguments
requiring the finiteness of the result for any power coefficient of the leading
infrared renormalon, and the consistency in the case of the absence of that
renormalon, require that this prescription be modified. The apparently most
natural modification leads to the result represented by the Principal Value.
The analytic structure of the amplitude in the complex coupling plane, obtained
in this way, is consistent with that obtained in the literature by other
methods.
| [
{
"created": "Thu, 14 Nov 2002 18:50:43 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Nov 2002 13:04:00 GMT",
"version": "v2"
},
{
"created": "Mon, 10 Feb 2003 14:36:41 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Cvetic",
"Gorazd",
"",
"UTFSM, Valparaiso"
]
] | Relation between the infrared renormalons, the Borel resummation prescriptions, and the analyticity structure of Green functions in perturbative QCD (pQCD) is investigated. A specific recently suggested Borel resummation prescription resulted in the Principal Value and an additional power-suppressed correction that is consistent with the Operator Product Expansion. Arguments requiring the finiteness of the result for any power coefficient of the leading infrared renormalon, and the consistency in the case of the absence of that renormalon, require that this prescription be modified. The apparently most natural modification leads to the result represented by the Principal Value. The analytic structure of the amplitude in the complex coupling plane, obtained in this way, is consistent with that obtained in the literature by other methods. |
hep-ph/0104238 | Robert Fleischer | Andrzej J. Buras, Robert Fleischer | Bounds on the Unitarity Triangle, $\sin 2\beta$ and $K\to\pi\nu\bar\nu$
Decays in Models with Minimal Flavour Violation | 25 pages, LaTeX, 4 figures. Few comments and one figure in view of
new B-factory results added, conclusions unchanged | Phys.Rev.D64:115010,2001 | 10.1103/PhysRevD.64.115010 | DESY 01-054, TUM-HEP-412/01 | hep-ph | null | We present a general discussion of the unitarity triangle from $\epsilon_K$,
$\Delta M_{d,s}$ and $K \to \pi\nu\overline{\nu}$ in models with minimal
flavour violation (MFV), allowing for arbitrary signs of the generalized
Inami--Lim functions $F_{tt}$ and $X$ relevant for $(\epsilon_K,\Delta
M_{d,s})$ and $K \to \pi\nu\overline{\nu}$, respectively. In the models in
which $F_{tt}$ has a sign opposite to the one in the Standard Model, i.e.
$F_{tt}<0$, the data for $(\epsilon_K, \Delta M_{d,s})$ imply an absolute lower
bound on the $B_d\to\psi K_{S}$ CP asymmetry $a_{\psi K_S}$ of 0.69, which is
substantially stronger than 0.42 arising in the case of $F_{tt}>0$. An
important finding of this paper is the observation that for given
$Br(K^+\to\pi^+\nu\overline{\nu})$ and $a_{\psi K_S}$ only two values for
$Br(K_{L}\to\pi^0\nu\overline{\nu})$, corresponding to the two signs of $X$,
are possible in the full class of MFV models, independently of any new
parameters arising in these models. This provides a powerful test for this
class of models. Moreover, we derive absolute lower and upper bounds on
$Br(K_{L}\to\pi^0\nu\overline{\nu})$ as functions of
$Br(K^+\to\pi^+\nu\overline{\nu})$. Using the present experimental upper bounds
on $Br(K^+\to\pi^+\nu\overline{\nu})$ and $|V_{ub}/V_{cb}|$, we obtain the
absolute upper bound $Br(K_{L}\to\pi^0\nu\overline{\nu})< 7.1 \cdot 10^{-10}$
(90% C.L.).
| [
{
"created": "Tue, 24 Apr 2001 08:53:48 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Aug 2001 15:36:03 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Buras",
"Andrzej J.",
""
],
[
"Fleischer",
"Robert",
""
]
] | We present a general discussion of the unitarity triangle from $\epsilon_K$, $\Delta M_{d,s}$ and $K \to \pi\nu\overline{\nu}$ in models with minimal flavour violation (MFV), allowing for arbitrary signs of the generalized Inami--Lim functions $F_{tt}$ and $X$ relevant for $(\epsilon_K,\Delta M_{d,s})$ and $K \to \pi\nu\overline{\nu}$, respectively. In the models in which $F_{tt}$ has a sign opposite to the one in the Standard Model, i.e. $F_{tt}<0$, the data for $(\epsilon_K, \Delta M_{d,s})$ imply an absolute lower bound on the $B_d\to\psi K_{S}$ CP asymmetry $a_{\psi K_S}$ of 0.69, which is substantially stronger than 0.42 arising in the case of $F_{tt}>0$. An important finding of this paper is the observation that for given $Br(K^+\to\pi^+\nu\overline{\nu})$ and $a_{\psi K_S}$ only two values for $Br(K_{L}\to\pi^0\nu\overline{\nu})$, corresponding to the two signs of $X$, are possible in the full class of MFV models, independently of any new parameters arising in these models. This provides a powerful test for this class of models. Moreover, we derive absolute lower and upper bounds on $Br(K_{L}\to\pi^0\nu\overline{\nu})$ as functions of $Br(K^+\to\pi^+\nu\overline{\nu})$. Using the present experimental upper bounds on $Br(K^+\to\pi^+\nu\overline{\nu})$ and $|V_{ub}/V_{cb}|$, we obtain the absolute upper bound $Br(K_{L}\to\pi^0\nu\overline{\nu})< 7.1 \cdot 10^{-10}$ (90% C.L.). |
hep-ph/9910202 | Vladimir Baier | V. N. Baier and V. M. Katkov | On Basic Concepts of the Quasiclassical Operator Approach | LaTeX, 11 pages, no figures | null | null | null | hep-ph | null | We present a derivation of the probability of bremsstrahlung from high-energy
electrons in a screened Coulomb field using the quasiclassical operator method.
It is shown that recent Zakharov's criticism is completely groundless and comes
from misunderstanding of the method. We confirm all our published results.
| [
{
"created": "Fri, 1 Oct 1999 07:00:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Baier",
"V. N.",
""
],
[
"Katkov",
"V. M.",
""
]
] | We present a derivation of the probability of bremsstrahlung from high-energy electrons in a screened Coulomb field using the quasiclassical operator method. It is shown that recent Zakharov's criticism is completely groundless and comes from misunderstanding of the method. We confirm all our published results. |
hep-ph/0310234 | Fred Jegerlehner | F. Jegerlehner | Theoretical precision in estimates of the hadronic contributions to
(g-2)_mu and alpha_QED(M_Z) | 10 pages, 2 tables, 4 figures | null | 10.1016/S0920-5632(03)02352-1 | DESY 03-170 | hep-ph | null | I review recent estimates of the non-perturbative hadronic vacuum
polarization contributions. Since these at present can only be evaluated in
terms of experimental data of limited precision, the related uncertainties pose
a serious limitation in our ability to make precise predictions. Besides e+e- -
annihilation data also tau decay spectra can help to get better predictions.
Here, it is important to account for all possible iso-spin violations in tau -
decay spectra, from which e+e- cross sections may be obtained by an iso-spin
rotation. The observed 10% discrepancy in the region above the rho may be
understood as a so far unaccounted iso-spin breaking effect.
| [
{
"created": "Mon, 20 Oct 2003 09:36:04 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Jegerlehner",
"F.",
""
]
] | I review recent estimates of the non-perturbative hadronic vacuum polarization contributions. Since these at present can only be evaluated in terms of experimental data of limited precision, the related uncertainties pose a serious limitation in our ability to make precise predictions. Besides e+e- - annihilation data also tau decay spectra can help to get better predictions. Here, it is important to account for all possible iso-spin violations in tau - decay spectra, from which e+e- cross sections may be obtained by an iso-spin rotation. The observed 10% discrepancy in the region above the rho may be understood as a so far unaccounted iso-spin breaking effect. |
hep-ph/0112108 | Dieter Mueller | A.V. Belitsky, D. M\"uller, A. Kirchner | Theory of deeply virtual Compton scattering on the nucleon | 76 pages, LaTeX, 16 figures, 3 tables, minor corrections | Nucl.Phys. B629 (2002) 323-392 | 10.1016/S0550-3213(02)00144-X | null | hep-ph hep-ex | null | We compute the cross section for leptoproduction of the real photon off the
nucleon, which is sensitive to the deeply virtual Compton scattering amplitude
with power accuracy. Our considerations go beyond the leading twist and involve
the complete analysis in the twist-three approximation. We discuss consequences
of the target and lepton beam polarizations for accessing the generalized
parton distributions from experimental measurements of the azimuthal angular
dependence of the final state photon or nucleon. We introduce several sets of
asymmetries, defined as Fourier moments with respect to the azimuthal angle,
which allow for a clear separation of the twist-two and -three sectors. Relying
on a simple ansatz for the generalized parton distributions, we give
quantitative estimates for azimuthal and spin asymmetries, discuss the
uncertainties of these predictions brought in by radiative corrections, and
compare them with experimental data as well as other theoretical expectations.
Furthermore, we derive a general parametrization of the DVCS amplitudes in the
region of small Bjorken variable.
| [
{
"created": "Fri, 7 Dec 2001 10:50:29 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Mar 2002 18:14:11 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Belitsky",
"A. V.",
""
],
[
"Müller",
"D.",
""
],
[
"Kirchner",
"A.",
""
]
] | We compute the cross section for leptoproduction of the real photon off the nucleon, which is sensitive to the deeply virtual Compton scattering amplitude with power accuracy. Our considerations go beyond the leading twist and involve the complete analysis in the twist-three approximation. We discuss consequences of the target and lepton beam polarizations for accessing the generalized parton distributions from experimental measurements of the azimuthal angular dependence of the final state photon or nucleon. We introduce several sets of asymmetries, defined as Fourier moments with respect to the azimuthal angle, which allow for a clear separation of the twist-two and -three sectors. Relying on a simple ansatz for the generalized parton distributions, we give quantitative estimates for azimuthal and spin asymmetries, discuss the uncertainties of these predictions brought in by radiative corrections, and compare them with experimental data as well as other theoretical expectations. Furthermore, we derive a general parametrization of the DVCS amplitudes in the region of small Bjorken variable. |
hep-ph/9905332 | Vicente Vento | I.V. Anikin (Dubna, JINR & Valencia U.), A. E. Dorokhov (Dubna, JINR &
Rio Claro State U.), A.E. Maximov (Dubna, JINR), L. Tomio (Rio Claro State
U.), V. Vento (Valencia U.) | Off-diagonal quark distribution functions of the pion within an
effective single instanton approximation | LaTeX; altered version; references and figures added. Published:
paper has been accepted for publication in Nucl. Phys. A | null | 10.1016/S0375-9474(00)00320-1 | null | hep-ph | null | We develop a relativistic quark model for pion structure, which incorporates
the non-trivial structure of the vacuum of Quantum Chromodynamics as modelled
by instantons. Pions are boundstates of quarks and the strong quark-pion vertex
is determined from an instanton induced effective lagrangian. The interaction
of the constituents of the pion with the external electromagnetic field is
introduced in gauge invariant form. The parameters of the model, i.e.,
effective instanton radius and constituent quark masses, are obtained from the
vacuum expectation values of the lowest dimensional quark and gluon operators
and the low-energy observables of the pion. We apply the formalism to the
calculation of the pion form factor by means of the isovector nonforward parton
distributions and find agreement with the experimental data.
| [
{
"created": "Thu, 13 May 1999 18:00:07 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Jun 2000 13:59:29 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Anikin",
"I. V.",
"",
"Dubna, JINR & Valencia U."
],
[
"Dorokhov",
"A. E.",
"",
"Dubna, JINR &\n Rio Claro State U."
],
[
"Maximov",
"A. E.",
"",
"Dubna, JINR"
],
[
"Tomio",
"L.",
"",
"Rio Claro State\n U."
],
[
"Vento",
"V.",
"",
"Valencia U."
]
] | We develop a relativistic quark model for pion structure, which incorporates the non-trivial structure of the vacuum of Quantum Chromodynamics as modelled by instantons. Pions are boundstates of quarks and the strong quark-pion vertex is determined from an instanton induced effective lagrangian. The interaction of the constituents of the pion with the external electromagnetic field is introduced in gauge invariant form. The parameters of the model, i.e., effective instanton radius and constituent quark masses, are obtained from the vacuum expectation values of the lowest dimensional quark and gluon operators and the low-energy observables of the pion. We apply the formalism to the calculation of the pion form factor by means of the isovector nonforward parton distributions and find agreement with the experimental data. |
hep-ph/9911507 | Alexei A. Pivovarov | A.A.Pivovarov | On the nonrelativistic dynamics of heavy particles near the production
threshold | 12 pages, latex | Phys.Lett. B475 (2000) 135-140 | 10.1016/S0370-2693(00)00063-0 | MZ-TH-99-52 | hep-ph hep-ex | null | A solution to the Schrodinger equation for the nonrelativistic Green function
which is used for describing the heavy quark-antiquark pair production near the
threshold in $e^+e^-$ annihilation is presented. A quick comparison with
existing results is given. A choice of the effective mass scale for the
nonrelativistic system with Coulomb interaction is discussed.
| [
{
"created": "Sat, 27 Nov 1999 10:48:17 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Pivovarov",
"A. A.",
""
]
] | A solution to the Schrodinger equation for the nonrelativistic Green function which is used for describing the heavy quark-antiquark pair production near the threshold in $e^+e^-$ annihilation is presented. A quick comparison with existing results is given. A choice of the effective mass scale for the nonrelativistic system with Coulomb interaction is discussed. |
hep-ph/9904349 | Francesco Vissani | Francesco Vissani | Neutrino spectrum, oscillation scenarios and neutrinoless double beta
decay | LaTeX, 3 pages, 1 figure. Submitted to the "6th Topical Seminar on
Neutrino and Astroparticle Physics", 17-21 May 1999, San Miniato, Italy | null | null | IC/99/36 | hep-ph | null | We introduce the representation on one unitarity triangle of the constraints
resulting (1) from the interpretation of solar and atmospheric neutrino data in
terms of oscillations, and (2) from the search for neutrinoless double beta
decay. We show its use for the study of a nearly degenerate neutrino spectrum.
The representation shows clearly the particular cases when the neutrinoless
double beta decay rate can (or cannot) be small, that is: when the connection
of the decay rate with the neutrino spectrum is less (or more) direct. These
cases turn out to depend crucially on the scenario of oscillation (MSW
solutions, vacuum oscillations, averaged oscillations), and in particular on
the size of the mixing between the electron neutrino and the neutrino state
giving rise to atmospheric neutrino oscillations.
| [
{
"created": "Thu, 15 Apr 1999 17:22:48 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Jul 1999 10:31:18 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Vissani",
"Francesco",
""
]
] | We introduce the representation on one unitarity triangle of the constraints resulting (1) from the interpretation of solar and atmospheric neutrino data in terms of oscillations, and (2) from the search for neutrinoless double beta decay. We show its use for the study of a nearly degenerate neutrino spectrum. The representation shows clearly the particular cases when the neutrinoless double beta decay rate can (or cannot) be small, that is: when the connection of the decay rate with the neutrino spectrum is less (or more) direct. These cases turn out to depend crucially on the scenario of oscillation (MSW solutions, vacuum oscillations, averaged oscillations), and in particular on the size of the mixing between the electron neutrino and the neutrino state giving rise to atmospheric neutrino oscillations. |
1801.00087 | Yoshitaka Hatta | Yoshikazu Hagiwara, Yoshitaka Hatta, Bo-Wen Xiao, Feng Yuan | Classical and quantum entropy of parton distributions | 12 pages, 2 figures | Phys. Rev. D 97, 094029 (2018) | 10.1103/PhysRevD.97.094029 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce the semiclassical Wehrl entropy for the nucleon as a measure of
complexity of the multiparton configuration in phase space. This gives a new
perspective on the nucleon tomography. We evaluate the entropy in the small-$x$
region and compare with the quantum von Neumann entropy. We also discuss the
growth of entropy at small-$x$ and argue that it eventually saturates due to
the Pomeron loop effect.
| [
{
"created": "Sat, 30 Dec 2017 05:05:18 GMT",
"version": "v1"
}
] | 2018-06-06 | [
[
"Hagiwara",
"Yoshikazu",
""
],
[
"Hatta",
"Yoshitaka",
""
],
[
"Xiao",
"Bo-Wen",
""
],
[
"Yuan",
"Feng",
""
]
] | We introduce the semiclassical Wehrl entropy for the nucleon as a measure of complexity of the multiparton configuration in phase space. This gives a new perspective on the nucleon tomography. We evaluate the entropy in the small-$x$ region and compare with the quantum von Neumann entropy. We also discuss the growth of entropy at small-$x$ and argue that it eventually saturates due to the Pomeron loop effect. |
1809.02025 | Erasmo Ferreira | E. Ferreira, A. K. Kohara and J. Sesma | Structure of Forward pp and p\=p Elastic Amplitudes at Low Energies | 28 pages and 26 figures | Phys. Rev. D 98, 094029 (2018) | 10.1103/PhysRevD.98.094029 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Exact analytical forms of solutions for Dispersion Relations for Amplitudes
and Dispersion Relations for Slopes are applied in the analysis of pp and $\rm
{p \bar p}$ scattering data in the forward range at energies below
$\sqrt(s)\approx 30 \GeV$. As inputs for the energy dependence of the imaginary
part, use is made of analytic form for the total cross sections and for
parameters of the $t$ dependence of the imaginary parts, with exponential and
linear factors.
A structure for the $t$ dependence of the real amplitude is written, with
slopes
$B_R$ and a linear factor $\rho-\mu_R t$ that allows compatibility of the
data with the predictions from dispersion relations for the derivatives of the
real amplitude at the origin. A very precise description is made of all
$d\sigma/dt$ data, with regular energy dependence of all quantities. It is
shown that a revision of previous calculations of total cross sections, slopes
and $\rho$ parameters in the literatures is necessary, and stressed that only
determinations based on $d\sigma/dt$ data covering sufficient $t$ range using
appropriate forms of amplitudes can be considered as valid.
| [
{
"created": "Thu, 6 Sep 2018 14:47:45 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Dec 2018 09:49:52 GMT",
"version": "v2"
}
] | 2018-12-05 | [
[
"Ferreira",
"E.",
""
],
[
"Kohara",
"A. K.",
""
],
[
"Sesma",
"J.",
""
]
] | Exact analytical forms of solutions for Dispersion Relations for Amplitudes and Dispersion Relations for Slopes are applied in the analysis of pp and $\rm {p \bar p}$ scattering data in the forward range at energies below $\sqrt(s)\approx 30 \GeV$. As inputs for the energy dependence of the imaginary part, use is made of analytic form for the total cross sections and for parameters of the $t$ dependence of the imaginary parts, with exponential and linear factors. A structure for the $t$ dependence of the real amplitude is written, with slopes $B_R$ and a linear factor $\rho-\mu_R t$ that allows compatibility of the data with the predictions from dispersion relations for the derivatives of the real amplitude at the origin. A very precise description is made of all $d\sigma/dt$ data, with regular energy dependence of all quantities. It is shown that a revision of previous calculations of total cross sections, slopes and $\rho$ parameters in the literatures is necessary, and stressed that only determinations based on $d\sigma/dt$ data covering sufficient $t$ range using appropriate forms of amplitudes can be considered as valid. |
hep-ph/0204063 | Joanne L. Hewett | JoAnne L. Hewett and Darius Sadri | Supersymmetric Extra Dimensions: Gravitino Effects in Selectron Pair
Production | 48 pgs | Phys.Rev. D69 (2004) 015001 | 10.1103/PhysRevD.69.015001 | SLAC-PUB-8782 | hep-ph | null | We examine the phenomenological consequences of a supersymmetric bulk in the
scenario of large extra dimensions. We assume supersymmetry is realized in the
bulk and study the interactions of the resulting bulk gravitino Kaluza-Klein
(KK) tower of states, with supersymmetry breaking on the brane inducing a light
mass for the zero-mode gravitino. We derive the 4-d effective theory, including
the couplings of the bulk gravitino KK states to fermions and their scalar
superpartners. The virtual exchange of the gravitino KK states in selectron
pair production in polarized \epem collisions is then examined. We find that
the leading order operator for this exchange is dimension six, in contrast to
that of bulk graviton KK exchange which induces a dimension eight operator at
lowest order. The resulting kinematic distributions for selectron production
are dramatically altered from those in D=4 supersymmetric scenarios, and can
lead to a enormous sensitivity to the fundamental higher dimensional Planck
scale, of order $20-25\times \sqrt s$.
| [
{
"created": "Fri, 5 Apr 2002 00:44:42 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Hewett",
"JoAnne L.",
""
],
[
"Sadri",
"Darius",
""
]
] | We examine the phenomenological consequences of a supersymmetric bulk in the scenario of large extra dimensions. We assume supersymmetry is realized in the bulk and study the interactions of the resulting bulk gravitino Kaluza-Klein (KK) tower of states, with supersymmetry breaking on the brane inducing a light mass for the zero-mode gravitino. We derive the 4-d effective theory, including the couplings of the bulk gravitino KK states to fermions and their scalar superpartners. The virtual exchange of the gravitino KK states in selectron pair production in polarized \epem collisions is then examined. We find that the leading order operator for this exchange is dimension six, in contrast to that of bulk graviton KK exchange which induces a dimension eight operator at lowest order. The resulting kinematic distributions for selectron production are dramatically altered from those in D=4 supersymmetric scenarios, and can lead to a enormous sensitivity to the fundamental higher dimensional Planck scale, of order $20-25\times \sqrt s$. |
hep-ph/9912262 | Thomas Hahn | J. Kuehn, T. Hahn, and R. Harlander | Top production above threshold: Electroweak and QCD corrections combined | 5 Pages, Talk presented by J. Kuehn at the Linear Collider Workshop,
Sitges, Spain, April 1999 | null | null | TTP99-50, KA-TP-26-1999, BNL-HET-99/42 | hep-ph | null | Top quark production in electron-positron annihilation is one of the
benchmark reactions at a future linear collider. Both electroweak and QCD
corrections are large, amounting to 10% or even more in specific kinematic
regions. In this note we present a method which allows to combine the dominant
terms from both sources, thus improving considerably the result based on a
simple addition of both corrections.
| [
{
"created": "Tue, 7 Dec 1999 16:32:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kuehn",
"J.",
""
],
[
"Hahn",
"T.",
""
],
[
"Harlander",
"R.",
""
]
] | Top quark production in electron-positron annihilation is one of the benchmark reactions at a future linear collider. Both electroweak and QCD corrections are large, amounting to 10% or even more in specific kinematic regions. In this note we present a method which allows to combine the dominant terms from both sources, thus improving considerably the result based on a simple addition of both corrections. |
hep-ph/9512278 | null | Csaba Csaki and Lisa Randall (MIT) | Phenomenological Constraints on the Higgs as Pseudo-Goldstone Boson
Mechanism in Supersymmetric GUT Theories | 15 pages, latex, 4 embedded figures | Nucl.Phys.B466:41-59,1996 | 10.1016/0550-3213(96)00102-2 | MIT-CTP-2478 | hep-ph | null | There are few robust solutions to the doublet-triplet splitting problem in
supersymmetric GUT theories. One of the more promising solutions is the Higgs
as pseudo-Goldstone boson mechanism. In its minimal implementation, such a
solution places an additional restriction on the parameter space of the minimal
supersymmetric standard model. A testable consequence of this constraint is an
equation for $\tan \beta$. We present this restriction and study its solutions
in order to constrain the allowed parameter space. Thus the assumptions on the
GUT scale Higgs sector should yield testable predictions for weak scale
physics. If the SUSY parameters are measured then it should be possible to
check the predictions, yielding insight into GUT scale physics.
| [
{
"created": "Mon, 11 Dec 1995 18:21:10 GMT",
"version": "v1"
}
] | 2009-09-15 | [
[
"Csaki",
"Csaba",
"",
"MIT"
],
[
"Randall",
"Lisa",
"",
"MIT"
]
] | There are few robust solutions to the doublet-triplet splitting problem in supersymmetric GUT theories. One of the more promising solutions is the Higgs as pseudo-Goldstone boson mechanism. In its minimal implementation, such a solution places an additional restriction on the parameter space of the minimal supersymmetric standard model. A testable consequence of this constraint is an equation for $\tan \beta$. We present this restriction and study its solutions in order to constrain the allowed parameter space. Thus the assumptions on the GUT scale Higgs sector should yield testable predictions for weak scale physics. If the SUSY parameters are measured then it should be possible to check the predictions, yielding insight into GUT scale physics. |
2112.15090 | Alexander Belyaev | Alexander Belyaev, Arran Freegard, Ilya F. Ginzburg, Daniel Locke and
Alexander Pukhov | Decoding Dark Matter at future $e^+ e^-$ colliders | Updated with the Electroweak Precision S,T,U oblique parameters
analytical and numerical evaluation | null | 10.1103/PhysRevD.106.015016 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the potential of the $e^+ e^-$ colliders to discover dark matter
and determine its properties such as mass and the spin. For this purpose we
study spin zero and spin one-half cases of dark matter, $D$ which belongs to
$SU(2)$ weak doublet and therefore has the charged doublet partner, $D^+$. For
the case of scalar dark matter we chose Inert Doublet Model, while for the case
of fermion dark matter we suggest the new minimal fermion dark matter model
with only three parameters. We choose two benchmarks for the models under study
which provide the correct amount of observed DM relic density and consistent
with the current DM searches. We focus on the particular process $e^+ e^- \to
D^+ D^- \to D D W^+ W^- \to DD(q \bar{q})(\mu^\pm\nu)$ at 500 GeV ILC collider
which gives rise to the "di-jet +$\mu$ + missing $E_T$" signature and study it
at the level of fast detector simulation, taking into account Bremsstrahlung
and ISR effects. We have found that two kinematical observables -- the energy
of the muon, $E_\mu$, and the angular distribution of $W$-boson, reconstructed
from di-jet, $\cos\theta_{jj}$ are very powerful in determination of DM mass
and spin, respectively. In particular we have demonstrated that in case of
fermion DM, the masses can be measured with a few percent accuracy already at
500 fb$^{-1}$ integrated luminosity. At the same time, the scalar DM model
which has about an order of magnitude lower signal, requires about factor of 40
higher luminosity to reach the same accuracy in the mass measurement. We have
found that one can distinguish fermion and scalar DM scenarios with about 2
ab$^{-1}$ total integrated luminosity or less without using the information on
the cross sections for benchmarks under study.
| [
{
"created": "Thu, 30 Dec 2021 15:27:07 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Aug 2022 09:17:37 GMT",
"version": "v2"
}
] | 2022-08-31 | [
[
"Belyaev",
"Alexander",
""
],
[
"Freegard",
"Arran",
""
],
[
"Ginzburg",
"Ilya F.",
""
],
[
"Locke",
"Daniel",
""
],
[
"Pukhov",
"Alexander",
""
]
] | We explore the potential of the $e^+ e^-$ colliders to discover dark matter and determine its properties such as mass and the spin. For this purpose we study spin zero and spin one-half cases of dark matter, $D$ which belongs to $SU(2)$ weak doublet and therefore has the charged doublet partner, $D^+$. For the case of scalar dark matter we chose Inert Doublet Model, while for the case of fermion dark matter we suggest the new minimal fermion dark matter model with only three parameters. We choose two benchmarks for the models under study which provide the correct amount of observed DM relic density and consistent with the current DM searches. We focus on the particular process $e^+ e^- \to D^+ D^- \to D D W^+ W^- \to DD(q \bar{q})(\mu^\pm\nu)$ at 500 GeV ILC collider which gives rise to the "di-jet +$\mu$ + missing $E_T$" signature and study it at the level of fast detector simulation, taking into account Bremsstrahlung and ISR effects. We have found that two kinematical observables -- the energy of the muon, $E_\mu$, and the angular distribution of $W$-boson, reconstructed from di-jet, $\cos\theta_{jj}$ are very powerful in determination of DM mass and spin, respectively. In particular we have demonstrated that in case of fermion DM, the masses can be measured with a few percent accuracy already at 500 fb$^{-1}$ integrated luminosity. At the same time, the scalar DM model which has about an order of magnitude lower signal, requires about factor of 40 higher luminosity to reach the same accuracy in the mass measurement. We have found that one can distinguish fermion and scalar DM scenarios with about 2 ab$^{-1}$ total integrated luminosity or less without using the information on the cross sections for benchmarks under study. |
hep-ph/9905276 | Arcadi Santamaria | German Rodrigo, Mikhail Bilenky and Arcadi Santamaria | Quark-mass effects for jet production in e^+ e^- collisions at the
next-to-leading order: results and applications | 50 pages, 12 figures, elsart.sty | Nucl.Phys. B554 (1999) 257-297 | 10.1016/S0550-3213(99)00293-X | FTUV/99-2, IFIC/99-2 | hep-ph | null | We present a detailed description of our calculation of next-to-leading order
QCD corrections to heavy quark production in e^+ e^- collisions including mass
effects. In particular, we study the observables $R_3^{b\ql}$ and $D_2^{b\ql}$
in the E, EM, JADE and DURHAM jet-clustering algorithms and show how one can
use these observables to obtain $m_b(m_Z)$ from data at the $Z$ peak.
| [
{
"created": "Fri, 7 May 1999 22:46:06 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Rodrigo",
"German",
""
],
[
"Bilenky",
"Mikhail",
""
],
[
"Santamaria",
"Arcadi",
""
]
] | We present a detailed description of our calculation of next-to-leading order QCD corrections to heavy quark production in e^+ e^- collisions including mass effects. In particular, we study the observables $R_3^{b\ql}$ and $D_2^{b\ql}$ in the E, EM, JADE and DURHAM jet-clustering algorithms and show how one can use these observables to obtain $m_b(m_Z)$ from data at the $Z$ peak. |
hep-ph/9609255 | Erwin Mirkes | Erwin Mirkes and Dieter Zeppenfeld | Fixed-Order QCD Backgrounds to BFKL Dynamics in Forward Jet Production | Latex, 6 pages, 2 figures. To appear in the proceedings of the 1996
HERA Physics Workshop. The complete paper, including figures, is also
available via anonymous ftp at ftp://ttpux2.physik.uni-karlsruhe.de/ , or via
www at http://www-ttp.physik.uni-karlsruhe.de/cgi-bin/preprints/ | null | null | MADPH-96-960, TTP96-40 | hep-ph | null | The production of forward jets of transverse momentum $p_T(j)\approx Q$ and
large momentum fraction $x_{jet}\gg x$ probes the onset of BFKL dynamics at
HERA. A full ${\cal O}(\alpha_s^2)$ calculation of the inclusive forward jet
cross section is presented and compared to the expected BFKL cross section.
| [
{
"created": "Thu, 5 Sep 1996 07:44:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mirkes",
"Erwin",
""
],
[
"Zeppenfeld",
"Dieter",
""
]
] | The production of forward jets of transverse momentum $p_T(j)\approx Q$ and large momentum fraction $x_{jet}\gg x$ probes the onset of BFKL dynamics at HERA. A full ${\cal O}(\alpha_s^2)$ calculation of the inclusive forward jet cross section is presented and compared to the expected BFKL cross section. |
hep-ph/9405286 | Tanmay Vachaspati | Tanmay Vachaspati | Electroweak Strings, Sphalerons and Magnetic Fields | 17 pages, TUTP-94-11 | null | null | null | hep-ph | null | We describe electroweak strings and their ability to carry Chern-Simons
number. Certain string configurations, for any $\theta_W$, carry Chern-Simons
number equal to that of the sphaleron and we conjecture that such strings are
``extended sphalerons''. The production of electroweak strings during the phase
transition is discussed and it is suggested that electroweak strings could
survive long enough for them to play a role in baryogenesis. Finally the issue
of magnetic field generation during the electroweak phase transition is
addressed and several points not discussed in the existing literature are
clarified. A connection is made between electroweak strings and magnetic fields
produced at the phase transition. (Based on the talk presented at the NATO
workshop on ``Electroweak Physics and the Early Universe'', in Sintra, March
1994)
| [
{
"created": "Fri, 13 May 1994 19:22:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Vachaspati",
"Tanmay",
""
]
] | We describe electroweak strings and their ability to carry Chern-Simons number. Certain string configurations, for any $\theta_W$, carry Chern-Simons number equal to that of the sphaleron and we conjecture that such strings are ``extended sphalerons''. The production of electroweak strings during the phase transition is discussed and it is suggested that electroweak strings could survive long enough for them to play a role in baryogenesis. Finally the issue of magnetic field generation during the electroweak phase transition is addressed and several points not discussed in the existing literature are clarified. A connection is made between electroweak strings and magnetic fields produced at the phase transition. (Based on the talk presented at the NATO workshop on ``Electroweak Physics and the Early Universe'', in Sintra, March 1994) |
2403.01937 | Lei Chang | Xiaobin Wang, Zexin Wu, Minghui Ding and Lei Chang | Examining the critical phenomenon of pion parton distribution: Insights
from the Moment Problem | The judgment made based on finite-order moments information about the
distribution function (DF) is insufficient | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recent study by Wang {\it et al.}(arXiv:2309.01417) proposed a novel
connection between the nature of the parton distribution function (PDF) and the
characteristics of its moments. In this study, we apply these findings to
analyze the evolution of the pion valence quark PDF, garnering valuable
qualitative insights. Firstly, we validate the non-negativity and continuity of
the PDF across a wide range of scales, indicating the logical consistency of
our chosen evolution scheme. Subsequently, we examine the unimodality of both
the PDF and its transformed counterpart, the xPDF, i.e., the parton
distribution function multiplied by the momentum fraction. We observe a smooth
evolution of the peak position of the xPDF towards the small-$x$ region with
increasing scale, while intriguingly, the PDF undergoes a phase of bimodal
competition as the energy scale evolves.
| [
{
"created": "Mon, 4 Mar 2024 11:14:11 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Mar 2024 01:11:42 GMT",
"version": "v2"
},
{
"created": "Mon, 15 Jul 2024 04:46:08 GMT",
"version": "v3"
}
] | 2024-07-16 | [
[
"Wang",
"Xiaobin",
""
],
[
"Wu",
"Zexin",
""
],
[
"Ding",
"Minghui",
""
],
[
"Chang",
"Lei",
""
]
] | A recent study by Wang {\it et al.}(arXiv:2309.01417) proposed a novel connection between the nature of the parton distribution function (PDF) and the characteristics of its moments. In this study, we apply these findings to analyze the evolution of the pion valence quark PDF, garnering valuable qualitative insights. Firstly, we validate the non-negativity and continuity of the PDF across a wide range of scales, indicating the logical consistency of our chosen evolution scheme. Subsequently, we examine the unimodality of both the PDF and its transformed counterpart, the xPDF, i.e., the parton distribution function multiplied by the momentum fraction. We observe a smooth evolution of the peak position of the xPDF towards the small-$x$ region with increasing scale, while intriguingly, the PDF undergoes a phase of bimodal competition as the energy scale evolves. |
1906.10341 | Kenta Takagi | Tatsuo Kobayashi, Yusuke Shimizu, Kenta Takagi, Morimitsu Tanimoto and
Takuya H. Tatsuishi | Modular $S_3$ invariant flavor model in SU(5) GUT | 16 pages, 5 figures and 1 table. Numerical data have been revised | Prog Theor Exp Phys (2020) | 10.1093/ptep/ptaa055 | EPHOU-19-008 and HUPD1907 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a flavor model with the $S_3$ modular invariance in the framework
of SU(5) GUT. The $S_3$ modular forms of weights $2$ and $4$ give the quark and
lepton mass matrices with a common complex parameter, the modulus $\tau$. The
GUT relation of down-type quarks and charged leptons is imposed by the VEV of
adjoint 24-dimensional Higgs multiplet in addition to the VEVs of $5$ and $\bar
5$ Higgs multiples of SU(5). The observed CKM and PMNS mixing parameters as
well as the mass eigenvalues are reproduced properly. We discuss the leptonic
CP phase and the effective mass of the neutrinoless double beta decay with the
sum of neutrino masses.
| [
{
"created": "Tue, 25 Jun 2019 06:35:00 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Aug 2019 08:21:08 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Nov 2019 06:31:53 GMT",
"version": "v3"
},
{
"created": "Wed, 22 Jan 2020 08:00:36 GMT",
"version": "v4"
},
{
"created": "Wed, 11 Mar 2020 03:44:54 GMT",
"version": "v5"
},
{
"created": "Mon, 30 Mar 2020 06:37:11 GMT",
"version": "v6"
}
] | 2020-05-27 | [
[
"Kobayashi",
"Tatsuo",
""
],
[
"Shimizu",
"Yusuke",
""
],
[
"Takagi",
"Kenta",
""
],
[
"Tanimoto",
"Morimitsu",
""
],
[
"Tatsuishi",
"Takuya H.",
""
]
] | We present a flavor model with the $S_3$ modular invariance in the framework of SU(5) GUT. The $S_3$ modular forms of weights $2$ and $4$ give the quark and lepton mass matrices with a common complex parameter, the modulus $\tau$. The GUT relation of down-type quarks and charged leptons is imposed by the VEV of adjoint 24-dimensional Higgs multiplet in addition to the VEVs of $5$ and $\bar 5$ Higgs multiples of SU(5). The observed CKM and PMNS mixing parameters as well as the mass eigenvalues are reproduced properly. We discuss the leptonic CP phase and the effective mass of the neutrinoless double beta decay with the sum of neutrino masses. |
hep-ph/0104005 | Alexei Anisovich | A. V. Anisovich | Quark/gluon content of eta(1295) and eta(1440) | 8 pages, 3 figures | null | null | null | hep-ph | null | The quark/gluon content of eta(1295) and eta(1440) mesons is discussed,
mesons being considered as members of the first radial excitation 2^1S_0 qqbar
nonet. Recent results on eta(1295) and eta(1440) two-photon widths from L3
together with the information on radiative J/Psi decay allow one to evaluate
the eta(1295)/eta(1440) mixing angle and the admixture of the glueball
component. We found that eta(1440) is dominantly non-strange qqbar state, with
a possible admixture of the glueball component (20 pm 20)%.
| [
{
"created": "Sun, 1 Apr 2001 16:39:41 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Anisovich",
"A. V.",
""
]
] | The quark/gluon content of eta(1295) and eta(1440) mesons is discussed, mesons being considered as members of the first radial excitation 2^1S_0 qqbar nonet. Recent results on eta(1295) and eta(1440) two-photon widths from L3 together with the information on radiative J/Psi decay allow one to evaluate the eta(1295)/eta(1440) mixing angle and the admixture of the glueball component. We found that eta(1440) is dominantly non-strange qqbar state, with a possible admixture of the glueball component (20 pm 20)%. |
hep-ph/9308300 | null | U. Ornik, R.M. Weiner and G. Wilk | Hydrodynamical Beam Jets in High Energy Hadronic Collisions | 3 pages (1 page of figures) ,(LATEX), GSI-93-27 | Nucl.Phys.A566:469c-472c,1994 | 10.1016/0375-9474(94)90671-8 | null | hep-ph nucl-th | null | A study of hadronic data up to TEVATRON energies in terms of relativistic
hydrodynamics indicates an extended 1-dimensional stage of the expansion which
suggests a jet like behaviour of the fireball along the collision axis.
| [
{
"created": "Thu, 19 Aug 1993 13:46:23 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Aug 1993 09:49:40 GMT",
"version": "v2"
}
] | 2011-04-20 | [
[
"Ornik",
"U.",
""
],
[
"Weiner",
"R. M.",
""
],
[
"Wilk",
"G.",
""
]
] | A study of hadronic data up to TEVATRON energies in terms of relativistic hydrodynamics indicates an extended 1-dimensional stage of the expansion which suggests a jet like behaviour of the fireball along the collision axis. |
2009.03903 | Robert D. Pisarski | Yoshimasa Hidaka and Robert D. Pisarski | Effective models of a semi-quark gluon plasma | 33 pages, 1 figure | null | 10.1103/PhysRevD.104.074036 | KEK-TH-2252, J-PARC-TH-224, RIKEN-iTHEMS-Report-20 | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the deconfined regime of a non-Abelian gauge theory at nonzero
temperature, previously it was argued that if a (gauge invariant) source is
added to generate nonzero holonomy, that this source must be linear for small
holonomy. The simplest example of this is the second Bernoulli polynomial.
However, then there is a conundrum in computing the free energy to $\sim g^3$
in the coupling constant $g$, as part of the free energy is discontinuous as
the holonomy vanishes. In this paper we investigate two ways of generating the
second Bernoulli polynomial dynamically: as a mass derivative of an auxiliary
field, and from two dimensional ghosts embedded isotropically in four
dimensions. Computing the holonomous hard thermal loop (HHTL) in the gluon
self-energy, we find that the limit of small holonomy is only well behaved for
two dimensional ghosts, with a free energy which to $\sim g^3$ is continuous as
the holonomy vanishes.
| [
{
"created": "Tue, 8 Sep 2020 18:00:01 GMT",
"version": "v1"
}
] | 2021-11-10 | [
[
"Hidaka",
"Yoshimasa",
""
],
[
"Pisarski",
"Robert D.",
""
]
] | In the deconfined regime of a non-Abelian gauge theory at nonzero temperature, previously it was argued that if a (gauge invariant) source is added to generate nonzero holonomy, that this source must be linear for small holonomy. The simplest example of this is the second Bernoulli polynomial. However, then there is a conundrum in computing the free energy to $\sim g^3$ in the coupling constant $g$, as part of the free energy is discontinuous as the holonomy vanishes. In this paper we investigate two ways of generating the second Bernoulli polynomial dynamically: as a mass derivative of an auxiliary field, and from two dimensional ghosts embedded isotropically in four dimensions. Computing the holonomous hard thermal loop (HHTL) in the gluon self-energy, we find that the limit of small holonomy is only well behaved for two dimensional ghosts, with a free energy which to $\sim g^3$ is continuous as the holonomy vanishes. |
hep-ph/0506083 | Antonio Marrone | G.L. Fogli, E. Lisi, A. Marrone, A. Palazzo (Bari U. & INFN, Bari) | Global analysis of three-flavor neutrino masses and mixings | Final version (including a new Appendix), to be published in
"Progress in Particle and Nuclear Physics". Higher-resolution pdf file and
eps figures can be download from http://www.ba.infn.it/~now2004/PPNP_review/ | Prog.Part.Nucl.Phys.57:742-795,2006 | 10.1016/j.ppnp.2005.08.002 | null | hep-ph astro-ph hep-ex nucl-ex | null | We present a comprehensive phenomenological analysis of a vast amount of data
from neutrino flavor oscillation and non-oscillation searches, performed within
the standard scenario with three massive and mixed neutrinos, and with
particular attention to subleading effects. The detailed results discussed in
this review represent a state-of-the-art, accurate and up-to-date (as of August
2005) estimate of the three-neutrino mass-mixing parameters.
| [
{
"created": "Wed, 8 Jun 2005 13:00:58 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Aug 2005 10:20:40 GMT",
"version": "v2"
}
] | 2009-10-07 | [
[
"Fogli",
"G. L.",
"",
"Bari U. & INFN, Bari"
],
[
"Lisi",
"E.",
"",
"Bari U. & INFN, Bari"
],
[
"Marrone",
"A.",
"",
"Bari U. & INFN, Bari"
],
[
"Palazzo",
"A.",
"",
"Bari U. & INFN, Bari"
]
] | We present a comprehensive phenomenological analysis of a vast amount of data from neutrino flavor oscillation and non-oscillation searches, performed within the standard scenario with three massive and mixed neutrinos, and with particular attention to subleading effects. The detailed results discussed in this review represent a state-of-the-art, accurate and up-to-date (as of August 2005) estimate of the three-neutrino mass-mixing parameters. |
hep-ph/0311249 | Hannes Jung | Hannes Jung (Lund University, Sweden) | kt - factorization and CCFM - the solution for describing the hadronic
final states - everywhere ? | to be published in MPLA, replaced with new references | Mod.Phys.Lett. A19 (2004) 1-18 | 10.1142/S0217732304012873 | null | hep-ph | null | The basic ideas of kt-factorization and CCFM parton evolution is discussed.
The unintegrated gluon densities, obtained from CCFM fits to the proton
structure function data at HERA are used to predict hadronic final state cross
sections like jet production at HERA, but also comparisons with recent
measurements of heavy quark production at the Tevatron are presented. Finally,
the kt-factorization approach is applied to Higgs production at high energy
hadron hadron colliders and the transverse momentum spectrum of Higgs
production at the LHC is calculated.
| [
{
"created": "Thu, 20 Nov 2003 16:24:16 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Nov 2003 14:49:22 GMT",
"version": "v2"
},
{
"created": "Tue, 25 Nov 2003 09:41:02 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Jung",
"Hannes",
"",
"Lund University, Sweden"
]
] | The basic ideas of kt-factorization and CCFM parton evolution is discussed. The unintegrated gluon densities, obtained from CCFM fits to the proton structure function data at HERA are used to predict hadronic final state cross sections like jet production at HERA, but also comparisons with recent measurements of heavy quark production at the Tevatron are presented. Finally, the kt-factorization approach is applied to Higgs production at high energy hadron hadron colliders and the transverse momentum spectrum of Higgs production at the LHC is calculated. |
2206.01425 | En Wang | Guan-Ying Wang, Neng-Chang Wei, Hui-Min Yang, En Wang, Li-Sheng Geng,
and Ju-Jun Xie | Roles of $a_0(980)$, $\Lambda(1670)$, and $\Sigma(1385)$ in the
$\Lambda_c^+ \to \eta \Lambda \pi^+$ decay | 8 pages, 9 figures | null | 10.1103/PhysRevD.106.056001 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Recently, the Belle Collaboration has measured the $\Lambda_c^+ \to \eta
\Lambda \pi^+$ decay and reported the $\eta\Lambda$ and $\Lambda\pi^+ $
invariant mass distributions, which show the clear signals of the resonances
$\Lambda(1670)$ and $\Sigma(1385)$, respectively. Based on our previous works
[Eur. Phys. J. C 76 (2016) 496 and Phys. Rev. D 95 (2017) 074024], we
re-analyze this process by considering the $S$-wave $\eta\Lambda$ and
$\eta\pi^+$ final state interactions within the chiral unitary approach, which
dynamically generate the $\Lambda(1670)$ and $a_0(980)$, respectively. Our
results are in good agreement with the Belle measurements, which supports the
molecular nature of the $\Lambda(1670)$ and $a_0(980)$. In addition, the $\eta
\pi^+$ invariant mass distributions are also computed and a cusp structure of
$a_0(980)$ is cleary shown around the $K\bar{K}$ mass threshold.
| [
{
"created": "Fri, 3 Jun 2022 07:31:09 GMT",
"version": "v1"
}
] | 2022-09-14 | [
[
"Wang",
"Guan-Ying",
""
],
[
"Wei",
"Neng-Chang",
""
],
[
"Yang",
"Hui-Min",
""
],
[
"Wang",
"En",
""
],
[
"Geng",
"Li-Sheng",
""
],
[
"Xie",
"Ju-Jun",
""
]
] | Recently, the Belle Collaboration has measured the $\Lambda_c^+ \to \eta \Lambda \pi^+$ decay and reported the $\eta\Lambda$ and $\Lambda\pi^+ $ invariant mass distributions, which show the clear signals of the resonances $\Lambda(1670)$ and $\Sigma(1385)$, respectively. Based on our previous works [Eur. Phys. J. C 76 (2016) 496 and Phys. Rev. D 95 (2017) 074024], we re-analyze this process by considering the $S$-wave $\eta\Lambda$ and $\eta\pi^+$ final state interactions within the chiral unitary approach, which dynamically generate the $\Lambda(1670)$ and $a_0(980)$, respectively. Our results are in good agreement with the Belle measurements, which supports the molecular nature of the $\Lambda(1670)$ and $a_0(980)$. In addition, the $\eta \pi^+$ invariant mass distributions are also computed and a cusp structure of $a_0(980)$ is cleary shown around the $K\bar{K}$ mass threshold. |
hep-ph/9807204 | Massimo | M. Testa | Exploring the Light-Cone through Semi-Inclusive Hadronic Distributions | 11 pages, plain Latex | JHEP 9809 (1998) 006 | 10.1088/1126-6708/1998/09/006 | null | hep-ph hep-th | null | Light-cone dominance is established for a particular set of semi-inclusive
observables in $e^+ e^-$ hadronic annihilation. This allows to deduce, with a
certain degree of rigor, the angular distribution of hadronic energy from first
principles, without invoking quark-hadron duality.
| [
{
"created": "Wed, 1 Jul 1998 08:21:29 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Testa",
"M.",
""
]
] | Light-cone dominance is established for a particular set of semi-inclusive observables in $e^+ e^-$ hadronic annihilation. This allows to deduce, with a certain degree of rigor, the angular distribution of hadronic energy from first principles, without invoking quark-hadron duality. |
2108.10055 | Athanasios Dedes Dr | Athanasios Dedes, Kostas Mantzaropoulos | Universal Scalar Leptoquark Action for Matching | 69 pages, v2: references added, v3: few sign errors and typos
corrected, refs added, version matches JHEP publication | null | 10.1007/JHEP11(2021)166 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this study we present a universal effective action for one-loop matching
of all scalar leptoquarks. We use both the Universal One-Loop Effective Action
(UOLEA) and covariant diagrams to evaluate the Wilson coefficients directly in
the Green basis for up-to dimension-6 operators. On the technical side, we use
the newly developed method of evaluating supertraces, to further validate the
results stemming from the use of covariant diagrams. As an application, we
perform a fully functional matching onto Standard Model Effective Field Theory
(SMEFT) of a model with two scalar leptoquark fields: a weak isospin singlet
and a doublet. We demonstrate its use by calculating several observables, such
as lepton magnetic and electric dipole moments, neutrino masses, proton decay
rate, while we comment upon fine tuning issues in this model. Apart from its
phenomenological interest, this model generates the majority of dimension-6
operators and provides an EFT benchmark towards future matching automation.
| [
{
"created": "Mon, 23 Aug 2021 10:46:08 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Aug 2021 08:48:09 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Nov 2021 07:28:13 GMT",
"version": "v3"
}
] | 2021-12-08 | [
[
"Dedes",
"Athanasios",
""
],
[
"Mantzaropoulos",
"Kostas",
""
]
] | In this study we present a universal effective action for one-loop matching of all scalar leptoquarks. We use both the Universal One-Loop Effective Action (UOLEA) and covariant diagrams to evaluate the Wilson coefficients directly in the Green basis for up-to dimension-6 operators. On the technical side, we use the newly developed method of evaluating supertraces, to further validate the results stemming from the use of covariant diagrams. As an application, we perform a fully functional matching onto Standard Model Effective Field Theory (SMEFT) of a model with two scalar leptoquark fields: a weak isospin singlet and a doublet. We demonstrate its use by calculating several observables, such as lepton magnetic and electric dipole moments, neutrino masses, proton decay rate, while we comment upon fine tuning issues in this model. Apart from its phenomenological interest, this model generates the majority of dimension-6 operators and provides an EFT benchmark towards future matching automation. |
0704.1049 | Hai-Yang Cheng | Hai-Yang Cheng, Chun-Khiang Chua, Amarjit Soni | Charmless Three-body Decays of B Mesons | 39 pages, 2 figures, version to appear in PRD | Phys.Rev.D76:094006,2007 | 10.1103/PhysRevD.76.094006 | null | hep-ph hep-ex | null | Charmless 3-body decays of B mesons are studied in the framework of the
factorization approach. The nonresonant contributions arising from $B\to
P_1P_2$ transitions are evaluated using heavy meson chiral perturbation theory
(HMChPT). The momentum dependence of nonresonant amplitudes is assumed to be in
the exponential form $e^{-\alpha_{NR}} p_B\cdot(p_i+p_j)}$ so that the HMChPT
results are recovered in the soft meson limit $p_i, p_j\to 0$. In addition, we
have identified another large source of the nonresonant signal in the matrix
elements of scalar densities, e.g. $<K\bar K|\bar ss|0>$, which can be
constrained from the decay $\bar B^0\to K_SK_SK_S$ or $B^-\to K^-K_SK_S$. The
intermediate vector meson contributions to 3-body decays are identified through
the vector current, while the scalar meson resonances are mainly associated
with the scalar density. Their effects are described in terms of the
Breit-Wigner formalism. Our main results are: (i) All KKK modes are dominated
by the nonresonant background. The predicted branching ratios of
$K^+K^-K_{S(L)}$, $K^+K^-K^-$ and $K^-K_SK_S$ modes are consistent with the
data within errors. (ii) Although the penguin-dominated $B^0\to K^+K^-K_{S}$
decay is subject to a potentially significant tree pollution, its effective
$\sin 2\beta$ is very similar to that of the $K_SK_SK_S$ mode. However, direct
CP asymmetry of the former, being of order -4%, is more prominent than the
latter. (iii) For $B\to K\pi\pi$ decays, we found sizable nonresonant
contributions in $K^-\pi^+\pi^-$ and $\bar K^0\pi^+\pi^-$ modes, in agreement
with the Belle measurements but larger than the BaBar result.
| [
{
"created": "Sun, 8 Apr 2007 22:54:14 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Oct 2007 09:09:43 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Cheng",
"Hai-Yang",
""
],
[
"Chua",
"Chun-Khiang",
""
],
[
"Soni",
"Amarjit",
""
]
] | Charmless 3-body decays of B mesons are studied in the framework of the factorization approach. The nonresonant contributions arising from $B\to P_1P_2$ transitions are evaluated using heavy meson chiral perturbation theory (HMChPT). The momentum dependence of nonresonant amplitudes is assumed to be in the exponential form $e^{-\alpha_{NR}} p_B\cdot(p_i+p_j)}$ so that the HMChPT results are recovered in the soft meson limit $p_i, p_j\to 0$. In addition, we have identified another large source of the nonresonant signal in the matrix elements of scalar densities, e.g. $<K\bar K|\bar ss|0>$, which can be constrained from the decay $\bar B^0\to K_SK_SK_S$ or $B^-\to K^-K_SK_S$. The intermediate vector meson contributions to 3-body decays are identified through the vector current, while the scalar meson resonances are mainly associated with the scalar density. Their effects are described in terms of the Breit-Wigner formalism. Our main results are: (i) All KKK modes are dominated by the nonresonant background. The predicted branching ratios of $K^+K^-K_{S(L)}$, $K^+K^-K^-$ and $K^-K_SK_S$ modes are consistent with the data within errors. (ii) Although the penguin-dominated $B^0\to K^+K^-K_{S}$ decay is subject to a potentially significant tree pollution, its effective $\sin 2\beta$ is very similar to that of the $K_SK_SK_S$ mode. However, direct CP asymmetry of the former, being of order -4%, is more prominent than the latter. (iii) For $B\to K\pi\pi$ decays, we found sizable nonresonant contributions in $K^-\pi^+\pi^-$ and $\bar K^0\pi^+\pi^-$ modes, in agreement with the Belle measurements but larger than the BaBar result. |
0710.3318 | Krzysztof Rolbiecki | Krzysztof Rolbiecki, Jan Kalinowski | CP violation in chargino production in e+e- collisions | 5 pages, 3 figures, presented at the XXXI Conference of Theoretical
Physics "Matter to the Deepest", Ustron, Poland, September 5-11, 2007 | ActaPhys.Polon.B38:3557-3562,2007 | null | null | hep-ph | null | We present the analysis of CP-violating effects in non-diagonal chargino pair
production in e+e- collisions. These effects appear only at the one-loop level.
We show that CP-odd asymmetries in chargino production are sensitive to the
phases of mu and A_t parameters and can be of the order of a few %.
| [
{
"created": "Wed, 17 Oct 2007 15:26:48 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Rolbiecki",
"Krzysztof",
""
],
[
"Kalinowski",
"Jan",
""
]
] | We present the analysis of CP-violating effects in non-diagonal chargino pair production in e+e- collisions. These effects appear only at the one-loop level. We show that CP-odd asymmetries in chargino production are sensitive to the phases of mu and A_t parameters and can be of the order of a few %. |
hep-ph/0402030 | Henryk Czyz | Henryk Czyz and Agnieszka Grzelinska | Hadronic cross section from radiative return | Invited talk at Workshop on $e^+e^-$ in the 1-2 GeV range: Physics
and Accelerator Prospects, 10-13 Sept. Alghero (SS), Italy | null | null | null | hep-ph | null | The impact of final-state radiation (FSR) on the radiative return method for
the extraction of the e+e- hadronic cross section is discussed in detail and
experimental tests of the model dependence of FSR are proposed for the pi+pi-
hadronic final state.
| [
{
"created": "Tue, 3 Feb 2004 12:00:08 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Czyz",
"Henryk",
""
],
[
"Grzelinska",
"Agnieszka",
""
]
] | The impact of final-state radiation (FSR) on the radiative return method for the extraction of the e+e- hadronic cross section is discussed in detail and experimental tests of the model dependence of FSR are proposed for the pi+pi- hadronic final state. |
hep-ph/0412376 | Alexandre Kisselev | A.V. Kisselev (IHEP, Protvino) | Interactions of cosmic neutrinos with nucleons in the RS model | 23 pages, LaTeX2e, 11 eps figures | Eur.Phys.J.C42:217-225,2005 | 10.1140/epjc/s2005-02284-y | null | hep-ph astro-ph | null | We consider the scattering of the brane fields due to t-channel massive
graviton exchanges in the Randall-Sundrum model. The eikonal amplitude is
analytically calculated and both differential and total neutrino-nucleon cross
sections are estimated. The event rate of quasi-horizontal air showers induced
by cosmic neutrinos, which can be detected at the Pierre Auger Observatory, is
presented for two different fluxes of cosmogenic neutrinos.
| [
{
"created": "Fri, 24 Dec 2004 08:22:12 GMT",
"version": "v1"
}
] | 2011-09-13 | [
[
"Kisselev",
"A. V.",
"",
"IHEP, Protvino"
]
] | We consider the scattering of the brane fields due to t-channel massive graviton exchanges in the Randall-Sundrum model. The eikonal amplitude is analytically calculated and both differential and total neutrino-nucleon cross sections are estimated. The event rate of quasi-horizontal air showers induced by cosmic neutrinos, which can be detected at the Pierre Auger Observatory, is presented for two different fluxes of cosmogenic neutrinos. |
2101.01412 | George Lazarides Prof. | George Lazarides, Qaisar Shafi | Triply Charged Monopole and Magnetic Quarks | 11 pages including 2 figures, version published in Phys. Lett. B | Phys.Lett.B 818 (2021) 136363 | 10.1016/j.physletb.2021.136363 | UT-STPD-21/01 | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We describe the internal composition of a topologically stable monopole
carrying a magnetic charge of $6\pi/e$ that arises from the spontaneous
breaking of the trinification symmetry $SU(3)_c\times SU(3)_L\times SU(3)_R$
($G$). Since this monopole carries no color magnetic charge, a charge of
$6\pi/e$ is required by the Dirac quantization condition. The breaking of $G$
to the Standard Model occurs in a number of steps and yields the desired
topologically stable monopole ("magnetic baryon"), consisting of three confined
monopoles. The confined monopoles ("magnetic quarks") each carry a combination
of Coulomb magnetic flux and magnetic flux tubes, and therefore they do not
exist as isolated states. We also display a more elaborate configuration ("fang
necklace") composed of these magnetic quarks. In contrast to the $SU(5)$
monopole which is superheavy and carries a magnetic charge of $2\pi/e$ as well
as color magnetic charge, the trinification monopole may have mass in the TeV
range, in which case it may be accessible at the LHC and its planned upgrades.
| [
{
"created": "Tue, 5 Jan 2021 08:47:13 GMT",
"version": "v1"
},
{
"created": "Wed, 19 May 2021 06:52:40 GMT",
"version": "v2"
}
] | 2021-05-25 | [
[
"Lazarides",
"George",
""
],
[
"Shafi",
"Qaisar",
""
]
] | We describe the internal composition of a topologically stable monopole carrying a magnetic charge of $6\pi/e$ that arises from the spontaneous breaking of the trinification symmetry $SU(3)_c\times SU(3)_L\times SU(3)_R$ ($G$). Since this monopole carries no color magnetic charge, a charge of $6\pi/e$ is required by the Dirac quantization condition. The breaking of $G$ to the Standard Model occurs in a number of steps and yields the desired topologically stable monopole ("magnetic baryon"), consisting of three confined monopoles. The confined monopoles ("magnetic quarks") each carry a combination of Coulomb magnetic flux and magnetic flux tubes, and therefore they do not exist as isolated states. We also display a more elaborate configuration ("fang necklace") composed of these magnetic quarks. In contrast to the $SU(5)$ monopole which is superheavy and carries a magnetic charge of $2\pi/e$ as well as color magnetic charge, the trinification monopole may have mass in the TeV range, in which case it may be accessible at the LHC and its planned upgrades. |
1203.2906 | Bo-Qiang Ma | Xinyi Zhang, Bo-Qiang Ma | A prediction of neutrino mixing matrix with CP violating phase | 9 pages. Version accepted for publication in PLB, with methods for
CP-violating phase measurements discussed | Phys. Lett. B 713 (2012) 202--205 | 10.1016/j.physletb.2012.05.045 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The latest experimental progress have established three kinds of neutrino
oscillations with three mixing angles measured to rather high precision. There
is still one parameter, i.e., the CP violating phase, missing in the neutrino
mixing matrix. It is shown that a replay between different parametrizations of
the mixing matrix can determine the full neutrino mixing matrix together with
the CP violating phase. From the maximal CP violation observed in the original
Kobayashi-Maskawa (KM) scheme of quark mixing matrix, we make an Ansatz of
maximal CP violation in the neutrino mixing matrix. This leads to the
prediction of all nine elements of the neutrino mixing matrix and also a
remarkable prediction of the CP violating phase $\delta_{\rm
CK}=(85.48^{+4.67(+12.87)}_{-1.80(-4.90)})^\circ$ within $1\sigma (3\sigma)$
range from available experimental information. We also predict the three angles
of the unitarity triangle corresponding to the quark sector for confronting
with the CP-violation related measurements.
| [
{
"created": "Tue, 13 Mar 2012 19:38:15 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Mar 2012 17:24:34 GMT",
"version": "v2"
},
{
"created": "Mon, 9 Apr 2012 06:08:26 GMT",
"version": "v3"
},
{
"created": "Tue, 22 May 2012 16:16:33 GMT",
"version": "v4"
}
] | 2012-06-22 | [
[
"Zhang",
"Xinyi",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] | The latest experimental progress have established three kinds of neutrino oscillations with three mixing angles measured to rather high precision. There is still one parameter, i.e., the CP violating phase, missing in the neutrino mixing matrix. It is shown that a replay between different parametrizations of the mixing matrix can determine the full neutrino mixing matrix together with the CP violating phase. From the maximal CP violation observed in the original Kobayashi-Maskawa (KM) scheme of quark mixing matrix, we make an Ansatz of maximal CP violation in the neutrino mixing matrix. This leads to the prediction of all nine elements of the neutrino mixing matrix and also a remarkable prediction of the CP violating phase $\delta_{\rm CK}=(85.48^{+4.67(+12.87)}_{-1.80(-4.90)})^\circ$ within $1\sigma (3\sigma)$ range from available experimental information. We also predict the three angles of the unitarity triangle corresponding to the quark sector for confronting with the CP-violation related measurements. |
1311.0370 | Yury Bystritskiy | E. A. Kuraev, A. I. Ahmadov, Yu. M. Bystritskiy, E. Tomasi-Gustafsson | Radiative corrections for electron proton elastic scattering taking into
account high orders and hard photon emission | 16 pages, 11 figures, 1 table | null | 10.1103/PhysRevC.89.065207 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the effect of high order radiative corrections in unpolarized
electron proton elastic scattering and compare with the calculations at lowest
order, which are usually applied to experimental data. Particular attention is
devoted to the $\epsilon$ dependence of radiative corrections, which is
directly related to the electric proton form factor. We consider in particular
the effects of the interference terms for soft and hard photon emission. Both
quadratic amplitude describing the collinear emission along the scattered
electron as well as the interference with the amplitudes of emission from the
initial electron and the emission from protons are important in leading and
next to leading approximation and they may compensate in particular kinematical
conditions.
| [
{
"created": "Sat, 2 Nov 2013 12:09:27 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Kuraev",
"E. A.",
""
],
[
"Ahmadov",
"A. I.",
""
],
[
"Bystritskiy",
"Yu. M.",
""
],
[
"Tomasi-Gustafsson",
"E.",
""
]
] | We investigate the effect of high order radiative corrections in unpolarized electron proton elastic scattering and compare with the calculations at lowest order, which are usually applied to experimental data. Particular attention is devoted to the $\epsilon$ dependence of radiative corrections, which is directly related to the electric proton form factor. We consider in particular the effects of the interference terms for soft and hard photon emission. Both quadratic amplitude describing the collinear emission along the scattered electron as well as the interference with the amplitudes of emission from the initial electron and the emission from protons are important in leading and next to leading approximation and they may compensate in particular kinematical conditions. |
hep-ph/9802355 | Ed Stoeffhaas | V. Barger | Supersymmetry vis-a-vis Muon Colliders | 14 pages, Latex2.09, uses aipproc.sty and espf.sty. 10 postscript
figures. Invited talk presented at the Workshop on Physics at the First Muon
Collider and at the Front End of a Muon Collider, Fermilab, November 1997.
Postscript file of complete paper also available from the UW-Madison
Phenomenology preprint archives at
ftp://pheno.physics.wisc.edu/pub/preprints/1998/madph-98-1038.ps.Z or | AIP Conf.Proc.435:107-120,1998 | 10.1063/1.56203 | MADPH-98-1038 | hep-ph | null | The potential of muon colliders to study a low-energy supersymmetry is
addressed in the framework of the minimal supergravity model, whose predictions
are first briefly surveyed. Foremost among the unique features of a muon
collider is s-channel production of Higgs bosons, by which Higgs boson masses,
widths, and couplings can be precisely measured to test the predictions of
supersymmetry. Measurements of the threshold region cross sections of W^+ W^-,
t t-bar, Zh, chargino pairs, slepton and sneutrino pairs will precisely
determine the corresponding masses and test supersymmetric radiative
corrections. At the high-energy frontier a 3 to 4 TeV muon collider is ideally
suited to study heavy scalar supersymmetric particles.
| [
{
"created": "Wed, 18 Feb 1998 22:11:20 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Barger",
"V.",
""
]
] | The potential of muon colliders to study a low-energy supersymmetry is addressed in the framework of the minimal supergravity model, whose predictions are first briefly surveyed. Foremost among the unique features of a muon collider is s-channel production of Higgs bosons, by which Higgs boson masses, widths, and couplings can be precisely measured to test the predictions of supersymmetry. Measurements of the threshold region cross sections of W^+ W^-, t t-bar, Zh, chargino pairs, slepton and sneutrino pairs will precisely determine the corresponding masses and test supersymmetric radiative corrections. At the high-energy frontier a 3 to 4 TeV muon collider is ideally suited to study heavy scalar supersymmetric particles. |
hep-ph/9601290 | null | K.Melnikov and V.G.Serbo | Processes with the $t$-channel singularity in the physical region:
finite beam sizes make cross sections finite | Latex, 17 pages, 3 figures | Nucl.Phys. B483 (1997) 67-82; Erratum-ibid. B662 (2003) 393-405 | 10.1016/S0550-3213(96)00558-5 | MZ-TH/96-03 | hep-ph | null | It is known that some high-energy processes have a $t$-channel singularity in
the physical region. In this paper we show that this singularity is regularized
if one takes into account the finite sizes of the colliding beams, i.e. the
realistic situation which takes place at high--energy colliders. On this way we
obtain the finite cross section which is linear proportional to the transverse
sizes of the colliding beams. As an application of the above result we study
the production of the single $W$ boson at $\mu^+\mu^-$ colliders in the
reaction $\mu ^- \mu ^+ \to e \bar \nu _e W^+ $. For the total energy $\sqrt
{s}\approx 95$ GeV and reasonable parameters of the muon beams the ``beam--size
'' dependent part of the cross section for this reaction is of the order of the
standard cross section of the $\mu ^- \mu ^+ \to \mu^- \bar \nu _{\mu} W^+ $
process.
| [
{
"created": "Thu, 18 Jan 1996 10:26:02 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Melnikov",
"K.",
""
],
[
"Serbo",
"V. G.",
""
]
] | It is known that some high-energy processes have a $t$-channel singularity in the physical region. In this paper we show that this singularity is regularized if one takes into account the finite sizes of the colliding beams, i.e. the realistic situation which takes place at high--energy colliders. On this way we obtain the finite cross section which is linear proportional to the transverse sizes of the colliding beams. As an application of the above result we study the production of the single $W$ boson at $\mu^+\mu^-$ colliders in the reaction $\mu ^- \mu ^+ \to e \bar \nu _e W^+ $. For the total energy $\sqrt {s}\approx 95$ GeV and reasonable parameters of the muon beams the ``beam--size '' dependent part of the cross section for this reaction is of the order of the standard cross section of the $\mu ^- \mu ^+ \to \mu^- \bar \nu _{\mu} W^+ $ process. |
2102.11260 | Antonino Di Piazza | A. Di Piazza and G. Audagnotto | Analytical spectrum of nonlinear Thomson scattering including radiation
reaction | 18 pages, no figures | Phys. Rev. D 104, 016007 (2021) | 10.1103/PhysRevD.104.016007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Accelerated charges emit electromagnetic radiation and the consequent
energy-momentum loss alters their trajectory. This phenomenon is known as
radiation reaction and the Landau-Lifshitz (LL) equation is the classical
equation of motion of the electron, which takes into account radiation-reaction
effects in the electron trajectory. By using the analytical solution of the LL
equation in an arbitrary plane wave, we compute the analytical expression of
the classical emission spectrum via nonlinear Thomson scattering including
radiation-reaction effects. Both the angularly-resolved and the
angularly-integrated spectra are reported, which are valid in an arbitrary
plane wave. Also, we have obtained a phase-dependent expression of the electron
dressed mass, which includes radiation-reaction effects. Finally, the
corresponding spectra within the locally constant field approximation have been
derived.
| [
{
"created": "Mon, 22 Feb 2021 18:48:10 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Feb 2021 18:22:19 GMT",
"version": "v2"
},
{
"created": "Wed, 7 Jul 2021 14:48:50 GMT",
"version": "v3"
}
] | 2021-07-14 | [
[
"Di Piazza",
"A.",
""
],
[
"Audagnotto",
"G.",
""
]
] | Accelerated charges emit electromagnetic radiation and the consequent energy-momentum loss alters their trajectory. This phenomenon is known as radiation reaction and the Landau-Lifshitz (LL) equation is the classical equation of motion of the electron, which takes into account radiation-reaction effects in the electron trajectory. By using the analytical solution of the LL equation in an arbitrary plane wave, we compute the analytical expression of the classical emission spectrum via nonlinear Thomson scattering including radiation-reaction effects. Both the angularly-resolved and the angularly-integrated spectra are reported, which are valid in an arbitrary plane wave. Also, we have obtained a phase-dependent expression of the electron dressed mass, which includes radiation-reaction effects. Finally, the corresponding spectra within the locally constant field approximation have been derived. |
1406.2523 | Cuiying Liang | Cuiying Liang, Yubing Dong and Weihong Liang | A discussion of deuteron transverse charge densities | 6 pages, 5 tables, 3 figures | Commun. Theor. Phys. 62, 383-387, 2014 | 10.1088/0253-6102/62/3/15 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The deuteron transverse charge density $\rho_C(b)$ is the two-dimensional
Fourier transform of its charge form factor in the impact space. We show that
different parameterizations of the charge form factors provide different
$\rho_C(b)$, in particular at the central value of impact parameter ($b=0$),
although all the parameterizations can well reproduce the form factors in the
region of small $Q^2$. In addition, we also check the explicit contributions
from the different coordinate intervals of the deuteron wave function to its
root-mean-square radius.
| [
{
"created": "Tue, 10 Jun 2014 12:20:39 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Aug 2014 06:35:12 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Liang",
"Cuiying",
""
],
[
"Dong",
"Yubing",
""
],
[
"Liang",
"Weihong",
""
]
] | The deuteron transverse charge density $\rho_C(b)$ is the two-dimensional Fourier transform of its charge form factor in the impact space. We show that different parameterizations of the charge form factors provide different $\rho_C(b)$, in particular at the central value of impact parameter ($b=0$), although all the parameterizations can well reproduce the form factors in the region of small $Q^2$. In addition, we also check the explicit contributions from the different coordinate intervals of the deuteron wave function to its root-mean-square radius. |
hep-ph/9502287 | null | Xing Min Wang and Xiaotong Song | The Center-of-Mass of A Few-Body Quantum System In An Effective Central
Field | 13 pages, Latex file | Phys.Rev. C51 (1995) 2750-2756 | 10.1103/PhysRevC.51.2750 | INPP-UVA-94-12, MUSK-PHYS-TP-94/6 | hep-ph | null | The center-of-mass(CM) of a few-body quantum system with a central field is
discussed. If the particles are in the designative eigenstates, the CM
coordinates of the system can be well-defined. In the CM bag model as well as
in other models with central fields, the CM-freedom separation rule and
effective nucleon electro-magnetic currents can be presented without any
undetermined parameter.
| [
{
"created": "Mon, 13 Feb 1995 16:55:52 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Wang",
"Xing Min",
""
],
[
"Song",
"Xiaotong",
""
]
] | The center-of-mass(CM) of a few-body quantum system with a central field is discussed. If the particles are in the designative eigenstates, the CM coordinates of the system can be well-defined. In the CM bag model as well as in other models with central fields, the CM-freedom separation rule and effective nucleon electro-magnetic currents can be presented without any undetermined parameter. |
hep-ph/9803359 | shunzo Kumano | S. Kumano and K. Umekawa (Saga University) | Modification of parton distributions in nuclei | 23 pages, REVTeX, epsf.sty, 9 eps figures. Submitted for publication.
Complete postscript file is available at
http://www.cc.saga-u.ac.jp/saga-u/riko/physics/quantum1/structure.html Email:
kumanos@cc.saga-u.ac.jp | null | null | SAGA-HE-130-98 | hep-ph hep-ex nucl-ex nucl-th | null | Nuclear parton distributions are studied in a parton model with rescaling and
recombination mechanisms. Parton x distributions are first calculated at Q^2=1
GeV^2 by the model, and they are evolved to larger Q^2 in order to be compared
with various F_2 data. The experimental shadowing is explained by the
parton-recombination effects. Then, the modification of sea-quark and gluon
distributions is investigated. We show x and Q^2 dependent results of the
ratios S_A/S_D and G_A/G_D. They indicate significant shadowing at small x and
large ratios in the medium-x region. Our theoretical results should be tested
by future experiments, for example, at RHIC (Relativistic Heavy Ion Collider).
Furthermore, our studies are important for finding a signature of the
quark-gluon plasma in heavy-ion reactions. We also indicate that nuclear
effects in the deuteron should be taken into account for finding the accurate
F_2 structure function of the neutron.
| [
{
"created": "Mon, 16 Mar 1998 10:50:44 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kumano",
"S.",
"",
"Saga University"
],
[
"Umekawa",
"K.",
"",
"Saga University"
]
] | Nuclear parton distributions are studied in a parton model with rescaling and recombination mechanisms. Parton x distributions are first calculated at Q^2=1 GeV^2 by the model, and they are evolved to larger Q^2 in order to be compared with various F_2 data. The experimental shadowing is explained by the parton-recombination effects. Then, the modification of sea-quark and gluon distributions is investigated. We show x and Q^2 dependent results of the ratios S_A/S_D and G_A/G_D. They indicate significant shadowing at small x and large ratios in the medium-x region. Our theoretical results should be tested by future experiments, for example, at RHIC (Relativistic Heavy Ion Collider). Furthermore, our studies are important for finding a signature of the quark-gluon plasma in heavy-ion reactions. We also indicate that nuclear effects in the deuteron should be taken into account for finding the accurate F_2 structure function of the neutron. |
hep-ph/9711247 | Samsonov | A. V. Samsonov | Forward scattering amplitude of the virtual longitudinal photon in QED | 8 pages, 5 figures | Phys.Atom.Nucl. 61 (1998) 2119-2122; Yad.Fiz. 61 (1998) 2232-2235 | null | null | hep-ph | null | Forward scattering amplitude of the virtual longitudinal photon at zero
energy on electron in QED in the limit of small photon virtualities is
calculated. The first radiation corrections are taken into account. Two terms
in the expansion over photon virtualities are obtained.
| [
{
"created": "Thu, 6 Nov 1997 02:34:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Samsonov",
"A. V.",
""
]
] | Forward scattering amplitude of the virtual longitudinal photon at zero energy on electron in QED in the limit of small photon virtualities is calculated. The first radiation corrections are taken into account. Two terms in the expansion over photon virtualities are obtained. |
2110.04185 | Junichiro Kawamura | Linda M. Carpenter, Humberto Gilmer and Junichiro Kawamura | Exploring nearly degenerate higgsinos using mono-$Z/W$ signal | 6 pages, 4 figures | null | 10.1016/j.physletb.2022.137191 | CTPU-PTC-21-34 | hep-ph hep-ex | http://creativecommons.org/licenses/by-sa/4.0/ | We propose a new search strategy for higgsinos. Assuming associated
production of higgsino-like pairs with a $W$ or $Z$ boson, we search in the
missing energy plus hadronically-tagged vector boson channel. We place
sensitivity limits for (HL-)LHC searches assuming
$\mathcal{O}({1\mathrm{-}3.5}~\mathrm{GeV})$ mass differences between the
lightest neutral and charged states. We point out that using the
$E_T^\mathrm{miss}$ distribution significantly increases the sensitivity of
this search. We find the higgsinos up to 110 (210) GeV can be excluded with
$139~(300)~\mathrm{fb}^{-1}$ data. The full data of the HL-LHC will exclude
(discover) the higgsinos up to 520 (280) GeV.
| [
{
"created": "Fri, 8 Oct 2021 15:07:20 GMT",
"version": "v1"
}
] | 2022-05-25 | [
[
"Carpenter",
"Linda M.",
""
],
[
"Gilmer",
"Humberto",
""
],
[
"Kawamura",
"Junichiro",
""
]
] | We propose a new search strategy for higgsinos. Assuming associated production of higgsino-like pairs with a $W$ or $Z$ boson, we search in the missing energy plus hadronically-tagged vector boson channel. We place sensitivity limits for (HL-)LHC searches assuming $\mathcal{O}({1\mathrm{-}3.5}~\mathrm{GeV})$ mass differences between the lightest neutral and charged states. We point out that using the $E_T^\mathrm{miss}$ distribution significantly increases the sensitivity of this search. We find the higgsinos up to 110 (210) GeV can be excluded with $139~(300)~\mathrm{fb}^{-1}$ data. The full data of the HL-LHC will exclude (discover) the higgsinos up to 520 (280) GeV. |
0704.3101 | Seung-il Nam | Seung-il Nam, Ki-Seok Choi, Atsushi Hosaka, Hyun-Chul Kim | A new candidate for non-strangeness pentaquarks: N*(1675) | 5 pages, 8 figures, Talk given at Yukawa International Seminar (YKIS)
2006 "New frontiers in QCD", 20 Nov. ~ 8 Dec. 2006, Yukawa Institute for
Theoretical Physics (YITP), Kyoto, Japan | Prog.Theor.Phys.Suppl.168:97-100,2007 | 10.1143/PTPS.168.97 | PNU-NTG-04/2007, PNU-NuRI-04/2007 | hep-ph | null | We study a new nucleon resonance from eta photoproduction, which was observed
at sqrt{s}=1675 MeV with a narrow decay width (~10 MeV) by the Tohoku LNS group
as well as the GRAAL collaboration. Using an effective Lagrangian approach, we
compute differential cross sections for the eta photoproduction. In addition to
N*(1675,1/2+-,3/2+-), we employ six other nucleon resonances, i.e.
N*(1520,1535,1650,1675,1710,1720) and vector meson exchanges which are the most
relevant ones to this reaction process. As a result, we can reproduce the GRAAL
data qualitatively well and observe obvious isospin asymmetry between the
transition magnetic moments of N*(1675): mu_{gamma nn*} >> mu_{gamma pp*},
which indicates that the newly found nucleon resonance may be identified as a
non-strange pentaquark state.
| [
{
"created": "Tue, 24 Apr 2007 01:33:54 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Nam",
"Seung-il",
""
],
[
"Choi",
"Ki-Seok",
""
],
[
"Hosaka",
"Atsushi",
""
],
[
"Kim",
"Hyun-Chul",
""
]
] | We study a new nucleon resonance from eta photoproduction, which was observed at sqrt{s}=1675 MeV with a narrow decay width (~10 MeV) by the Tohoku LNS group as well as the GRAAL collaboration. Using an effective Lagrangian approach, we compute differential cross sections for the eta photoproduction. In addition to N*(1675,1/2+-,3/2+-), we employ six other nucleon resonances, i.e. N*(1520,1535,1650,1675,1710,1720) and vector meson exchanges which are the most relevant ones to this reaction process. As a result, we can reproduce the GRAAL data qualitatively well and observe obvious isospin asymmetry between the transition magnetic moments of N*(1675): mu_{gamma nn*} >> mu_{gamma pp*}, which indicates that the newly found nucleon resonance may be identified as a non-strange pentaquark state. |
hep-ph/0212318 | Nicos Stefanis | S. S. Agaev (State U. of Baku), N. G. Stefanis (U. of Bochum) | Power corrections to the space-like transition form factor
F_{\eta^{\prime}g^{*}g^{*}}(Q^2,\omega) | 38 pages, RevTeX4 used. 18 figures as PS/EPS files. Discussion
extended; some typos corrected; change of renormalization scale to 1 GeV.
Main results unchanged. Matches version to be published in Eur. Phys. J. C | Eur.Phys.J. C32 (2004) 507-528 | 10.1140/epjc/s2003-01463-2 | RUB-TPII-18/02 | hep-ph | null | Employing the standard hard-scattering approach (HSA) in conjunction with the
running-coupling (RC) method, the latter joined with the infrared-renormalon
calculus, we compute power-suppressed corrections $\sim 1/Q^{2n}, n=1, 2,...$
to the massless $\eta^{\prime}$ meson - virtual gluon transition form factor
(FF) $Q^2F_{\eta ^{\prime}g^{*}g^{*}}(Q^2,\omega)$. Contributions to the form
factor from the quark and gluon components of the $\eta^{\prime}$ meson are
taken into account. Analytic expressions for the FF's
$F_{\eta^{\prime}gg^{*}}(Q^2,\omega=\pm 1)$ and
$F_{\eta^{\prime}g^{*}g^{*}}(Q^2,\omega=0)$ are also presented, as well as
Borel transforms $B[Q^{2}F_{\eta^{\prime}g^{*}g^{*}}](u)$ and resummed
expressions. It is shown that except for $\omega=\pm 1, 0$, the Borel transform
contains an infinite number of infrared renormalon poles. It is demonstrated
that in the explored range of the total gluon virtuality $1 \rm {GeV}^{2} \leq
Q^2 \leq 25 \rm {GeV}^{2}$, power corrections found with the RC method
considerably enhance the FF $F_{\eta^{\prime}g^{*}g^{*}}(Q^{2}, \omega)$
relative to results obtained only in the context of the standard HSA with a
``frozen'' coupling.
| [
{
"created": "Fri, 20 Dec 2002 17:57:25 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Dec 2002 15:35:35 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Nov 2003 17:44:32 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Agaev",
"S. S.",
"",
"State U. of Baku"
],
[
"Stefanis",
"N. G.",
"",
"U. of Bochum"
]
] | Employing the standard hard-scattering approach (HSA) in conjunction with the running-coupling (RC) method, the latter joined with the infrared-renormalon calculus, we compute power-suppressed corrections $\sim 1/Q^{2n}, n=1, 2,...$ to the massless $\eta^{\prime}$ meson - virtual gluon transition form factor (FF) $Q^2F_{\eta ^{\prime}g^{*}g^{*}}(Q^2,\omega)$. Contributions to the form factor from the quark and gluon components of the $\eta^{\prime}$ meson are taken into account. Analytic expressions for the FF's $F_{\eta^{\prime}gg^{*}}(Q^2,\omega=\pm 1)$ and $F_{\eta^{\prime}g^{*}g^{*}}(Q^2,\omega=0)$ are also presented, as well as Borel transforms $B[Q^{2}F_{\eta^{\prime}g^{*}g^{*}}](u)$ and resummed expressions. It is shown that except for $\omega=\pm 1, 0$, the Borel transform contains an infinite number of infrared renormalon poles. It is demonstrated that in the explored range of the total gluon virtuality $1 \rm {GeV}^{2} \leq Q^2 \leq 25 \rm {GeV}^{2}$, power corrections found with the RC method considerably enhance the FF $F_{\eta^{\prime}g^{*}g^{*}}(Q^{2}, \omega)$ relative to results obtained only in the context of the standard HSA with a ``frozen'' coupling. |
hep-ph/9807394 | Philip G. Ratcliffe | Philip G. Ratcliffe | SU(3) Breaking in Hyperon Beta Decays: a Prediction for Xi0 -> Sigma+ e
anti-neutrino | Presented at the III Int. Conf. on Hyperons, Charm and Beauty Hadrons
(Genova, June-July 1998). 3 pages, LaTeX2e, uses fleqn, espcrc2, acromake and
axodraw packages (incl.) | Nucl.Phys.Proc.Suppl. 75B (1999) 60-62 | 10.1016/S0920-5632(99)00325-4 | EPTCO-98-003 | hep-ph | null | SU(3) breaking in hyperon semi-leptonic decays is discussed. The SU(3)
parameters $F$ and $D$, relevant to the ``proton-spin puzzle'', are extracted
and a prediction is presented for the decay Xi0 -> Sigma+ e anti-neutrino,
currently under study by the KTeV collaboration. The values found are g1/f1 =
1.16+/-0.03+/-0.01 and Gamma = (0.80+/-0.03+/-0.01) x 10^6 s^-1.
| [
{
"created": "Thu, 16 Jul 1998 10:17:37 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Ratcliffe",
"Philip G.",
""
]
] | SU(3) breaking in hyperon semi-leptonic decays is discussed. The SU(3) parameters $F$ and $D$, relevant to the ``proton-spin puzzle'', are extracted and a prediction is presented for the decay Xi0 -> Sigma+ e anti-neutrino, currently under study by the KTeV collaboration. The values found are g1/f1 = 1.16+/-0.03+/-0.01 and Gamma = (0.80+/-0.03+/-0.01) x 10^6 s^-1. |
hep-ph/0702002 | Yukihiro Mimura | Bhaskar Dutta and Yukihiro Mimura | Landscape of Little Hierarchy | 19 pages, 4 figures | Phys.Lett.B648:357-364,2007 | 10.1016/j.physletb.2007.03.035 | MIFP-07-04 | hep-ph | null | We investigate the little hierarchy between Z boson mass and the SUSY
breaking scale in the context of landscape of electroweak symmetry breaking
vacua. We consider the radiative symmetry breaking and found that the scale
where the electroweak symmetry breaking conditions are satisfied and the
average stop mass scale is preferred to be very close to each other in spite of
the fact that their origins depend on different parameters of the model. If the
electroweak symmetry breaking scale is fixed at about 1 TeV by the
supersymmetry model parameters then the little hierarchy seems to be preferred
among the electroweak symmetry breaking vacua. We characterize the little
hierarchy by a probability function and the mSUGRA model is used as an example
to show the 90% and 95% probability contours in the experimentally allowed
region. We also investigate the size of the Higgsino mass by considering the
distribution of electroweak symmetry breaking scale.
| [
{
"created": "Wed, 31 Jan 2007 21:04:01 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Dutta",
"Bhaskar",
""
],
[
"Mimura",
"Yukihiro",
""
]
] | We investigate the little hierarchy between Z boson mass and the SUSY breaking scale in the context of landscape of electroweak symmetry breaking vacua. We consider the radiative symmetry breaking and found that the scale where the electroweak symmetry breaking conditions are satisfied and the average stop mass scale is preferred to be very close to each other in spite of the fact that their origins depend on different parameters of the model. If the electroweak symmetry breaking scale is fixed at about 1 TeV by the supersymmetry model parameters then the little hierarchy seems to be preferred among the electroweak symmetry breaking vacua. We characterize the little hierarchy by a probability function and the mSUGRA model is used as an example to show the 90% and 95% probability contours in the experimentally allowed region. We also investigate the size of the Higgsino mass by considering the distribution of electroweak symmetry breaking scale. |
1908.00396 | Nivedita Ghosh | Nivedita Ghosh, Swagata Ghosh, Ipsita Saha | Charged Higgs searches in the Georgi-Machacek model at the LHC | 14 pages, 7 figures, 2 tables. Figures 1, 2 and 7 have been modified,
abstract updated, references updated, version accepted for publication in
Phys. Rev. D | Phys. Rev. D 101, 015029 (2020) | 10.1103/PhysRevD.101.015029 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Georgi-Machacek Model allows for a large triplet vacuum expectation value
(vev) with a custodial symmetric scalar potential. This manifestly leads to
large charged Higgs coupling to SM fermions thus enhancing the detection
probability of the model at the Large hadron collider. We show that the latest
bound from LHC searches on singly charged Higgs scalar decaying to top and
bottom quark restricts the triplet vev from above. We demonstrate that the
combined limit from theoretical constraints and the latest Higgs data together
with this charged Higgs bound can already curb the model parameter space
significantly. Further, we propose the charged Higgs decaying to $W^{\pm}$
boson and a SM-like Higgs as a prospective channel to probe the yet unbounded
model parameter space at the future run of the LHC. A simple cut-based analysis
for this channel has been made showing the parameter region that can be probed
with $5\sigma$ significance at the high luminosity LHC run.
| [
{
"created": "Thu, 1 Aug 2019 13:46:41 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Jan 2020 06:39:40 GMT",
"version": "v2"
}
] | 2020-02-05 | [
[
"Ghosh",
"Nivedita",
""
],
[
"Ghosh",
"Swagata",
""
],
[
"Saha",
"Ipsita",
""
]
] | The Georgi-Machacek Model allows for a large triplet vacuum expectation value (vev) with a custodial symmetric scalar potential. This manifestly leads to large charged Higgs coupling to SM fermions thus enhancing the detection probability of the model at the Large hadron collider. We show that the latest bound from LHC searches on singly charged Higgs scalar decaying to top and bottom quark restricts the triplet vev from above. We demonstrate that the combined limit from theoretical constraints and the latest Higgs data together with this charged Higgs bound can already curb the model parameter space significantly. Further, we propose the charged Higgs decaying to $W^{\pm}$ boson and a SM-like Higgs as a prospective channel to probe the yet unbounded model parameter space at the future run of the LHC. A simple cut-based analysis for this channel has been made showing the parameter region that can be probed with $5\sigma$ significance at the high luminosity LHC run. |
hep-ph/0305019 | Georg Kreyerhoff | Saul Barshay and Georg Kreyerhoff | Absolute values of three neutrino masses from atmospheric mixing and an
ansatz for the mixing-matrix elements | 5 pages, no figures. Version to be published in Europhysics Letters | Europhys.Lett.63:519-523,2003 | 10.1209/epl/i2003-00463-3 | null | hep-ph | null | Using data from atmospheric neutrino mixing, and a simple functional form for
mixing angles, the absolute values of three neutrino masses are calculated:
$m_3\cong 5.37\times 10^{-2} eV$, $m_2\cong 1.94\times 10^{-2} eV$, $m_1\cong
1.46\times 10^{-2} eV$. The quantities relevant for solar neutrino mixing are
calculated: $(m_2^2-m_1^2) \cong 1.63\times 10^{-4} eV^2$, with non-maximal
mixing $\tan^2\theta_\sol \cong 0.56$. The analysis gives a suggestion of a
dynamical origin for the empirical, large CP-violating phase associated with an
intrinsically, very small mixing angle in the quark sector.
| [
{
"created": "Fri, 2 May 2003 12:11:13 GMT",
"version": "v1"
},
{
"created": "Tue, 13 May 2003 16:56:20 GMT",
"version": "v2"
},
{
"created": "Fri, 27 Jun 2003 14:57:19 GMT",
"version": "v3"
}
] | 2010-12-17 | [
[
"Barshay",
"Saul",
""
],
[
"Kreyerhoff",
"Georg",
""
]
] | Using data from atmospheric neutrino mixing, and a simple functional form for mixing angles, the absolute values of three neutrino masses are calculated: $m_3\cong 5.37\times 10^{-2} eV$, $m_2\cong 1.94\times 10^{-2} eV$, $m_1\cong 1.46\times 10^{-2} eV$. The quantities relevant for solar neutrino mixing are calculated: $(m_2^2-m_1^2) \cong 1.63\times 10^{-4} eV^2$, with non-maximal mixing $\tan^2\theta_\sol \cong 0.56$. The analysis gives a suggestion of a dynamical origin for the empirical, large CP-violating phase associated with an intrinsically, very small mixing angle in the quark sector. |
1503.01261 | Andre Martin J | Andr\'e Martin, S. M. Roy | Froissart Bound on Inelastic Cross Section Without Unknown Constants | 9 pages. Submitted to Physical Review D | Phys. Rev. D 91, 076006 (2015) | 10.1103/PhysRevD.91.076006 | CERN-PH-TH/2015-035 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Assuming that axiomatic local field theory results hold for hadron
scattering, Andr\'e Martin and S. M. Roy recently obtained absolute bounds on
the D-wave below threshold for pion-pion scattering and thereby determined the
scale of the logarithm in the Froissart bound on total cross sections in terms
of pion mass only. Previously, Martin proved a rigorous upper bound on the
inelastic cross-section $\sigma_{inel}$ which is one-fourth of the
corresponding upper bound on $\sigma_{tot}$, and Wu, Martin,Roy and Singh
improved the bound by adding the constraint of a given $\sigma_{tot}$. Here we
use unitarity and analyticity to determine, without any high energy
approximation, upper bounds on energy averaged inelastic cross sections in
terms of low energy data in the crossed channel. These are Froissart-type
bounds without any unknown coefficient or unknown scale factors and can be
tested experimentally. Alternatively, their asymptotic forms,together with the
Martin-Roy absolute bounds on pion-pion D-waves below threshold, yield absolute
bounds on energy-averaged inelastic cross sections. E.g. for $\pi^0 \pi^0$
scattering, defining $\sigma_{inel}=\sigma_{tot} -\big (\sigma^{\pi^0 \pi^0
\rightarrow \pi^0 \pi^0} + \sigma^{\pi^0 \pi^0 \rightarrow \pi^+ \pi^-} \big
)$,we show that for c.m. energy $\sqrt{s}\rightarrow \infty $,
$\bar{\sigma}_{inel }(s,\infty)\equiv s\int_{s} ^{\infty } ds'\sigma_{inel
}(s')/s'^2 \leq (\pi /4) (m_{\pi })^{-2} [\ln (s/s_1)+(1/2)\ln \ln (s/s_1)
+1]^2$ where $1/s_1= 34\pi \sqrt{2\pi }\>m_{\pi }^{-2} $ . This bound is
asymptotically one-fourth of the corresponding Martin-Roy bound on the total
cross section, and the scale factor $s_1$ is one-fourth of the scale factor in
the total cross section bound. The average over the interval (s,2s) of the
inelastic $\pi^0 \pi^0 $cross section has a bound of the same form with $1/s_1$
replaced by $1/s_2=2/s_1 $.
| [
{
"created": "Wed, 4 Mar 2015 09:32:47 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Mar 2015 12:08:09 GMT",
"version": "v2"
}
] | 2015-04-29 | [
[
"Martin",
"André",
""
],
[
"Roy",
"S. M.",
""
]
] | Assuming that axiomatic local field theory results hold for hadron scattering, Andr\'e Martin and S. M. Roy recently obtained absolute bounds on the D-wave below threshold for pion-pion scattering and thereby determined the scale of the logarithm in the Froissart bound on total cross sections in terms of pion mass only. Previously, Martin proved a rigorous upper bound on the inelastic cross-section $\sigma_{inel}$ which is one-fourth of the corresponding upper bound on $\sigma_{tot}$, and Wu, Martin,Roy and Singh improved the bound by adding the constraint of a given $\sigma_{tot}$. Here we use unitarity and analyticity to determine, without any high energy approximation, upper bounds on energy averaged inelastic cross sections in terms of low energy data in the crossed channel. These are Froissart-type bounds without any unknown coefficient or unknown scale factors and can be tested experimentally. Alternatively, their asymptotic forms,together with the Martin-Roy absolute bounds on pion-pion D-waves below threshold, yield absolute bounds on energy-averaged inelastic cross sections. E.g. for $\pi^0 \pi^0$ scattering, defining $\sigma_{inel}=\sigma_{tot} -\big (\sigma^{\pi^0 \pi^0 \rightarrow \pi^0 \pi^0} + \sigma^{\pi^0 \pi^0 \rightarrow \pi^+ \pi^-} \big )$,we show that for c.m. energy $\sqrt{s}\rightarrow \infty $, $\bar{\sigma}_{inel }(s,\infty)\equiv s\int_{s} ^{\infty } ds'\sigma_{inel }(s')/s'^2 \leq (\pi /4) (m_{\pi })^{-2} [\ln (s/s_1)+(1/2)\ln \ln (s/s_1) +1]^2$ where $1/s_1= 34\pi \sqrt{2\pi }\>m_{\pi }^{-2} $ . This bound is asymptotically one-fourth of the corresponding Martin-Roy bound on the total cross section, and the scale factor $s_1$ is one-fourth of the scale factor in the total cross section bound. The average over the interval (s,2s) of the inelastic $\pi^0 \pi^0 $cross section has a bound of the same form with $1/s_1$ replaced by $1/s_2=2/s_1 $. |
hep-ph/0006021 | Jiro Kodaira | Y. Kiyo, J. Kodaira, K. Morii, T. Nasuno and S. Parke | The spin correlation in top quark production: QCD corrections vs
anomalous couplings | 6 pages, LaTeX, 8 postscript figures, uses espcrc2.sty; talk
presented at Loops and Legs in Quantum Field Theory, April 2000, Bastei,
Germany | Nucl.Phys.Proc.Suppl. 89 (2000) 37-42 | 10.1016/S0920-5632(00)00819-7 | null | hep-ph | null | We discuss top quark production and its subsequent decay at lepton colliders
including both QCD corrections and anomalous gamma / Z - t t-bar couplings. The
off-diagonal spin basis for the top and anti-top quarks is shown to be useful
to probe the anomalous couplings.
| [
{
"created": "Fri, 2 Jun 2000 07:58:21 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kiyo",
"Y.",
""
],
[
"Kodaira",
"J.",
""
],
[
"Morii",
"K.",
""
],
[
"Nasuno",
"T.",
""
],
[
"Parke",
"S.",
""
]
] | We discuss top quark production and its subsequent decay at lepton colliders including both QCD corrections and anomalous gamma / Z - t t-bar couplings. The off-diagonal spin basis for the top and anti-top quarks is shown to be useful to probe the anomalous couplings. |
hep-ph/0201214 | Zoubs | Yong-Jun Zhang, Bing-Song Zou and Li-Ming Yang, (Peking University and
Institute of High Energy Physics, CAS, Beijing, China) | Parton Distribution of Proton in a Simple Statistical Model | Postscript file, 8 pages | Phys.Lett. B528 (2002) 228-232 | 10.1016/S0370-2693(02)01215-7 | BIHEP-TH-2002-6 | hep-ph | null | Taking proton as an ensemble of quark-gluon Fock states and using the
principle of detailed balance, we construct a simple statistical model for
parton distribution of proton. The recent observed Bjorken-$x$ dependent light
flavor sea quark asymmetry $\bar{d}(x)-\bar{u}(x)$ can be well reproduced by
Monte Carlo simulation as a pure statistical effect.
| [
{
"created": "Wed, 23 Jan 2002 01:34:36 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Zhang",
"Yong-Jun",
""
],
[
"Zou",
"Bing-Song",
""
],
[
"Yang",
"Li-Ming",
""
]
] | Taking proton as an ensemble of quark-gluon Fock states and using the principle of detailed balance, we construct a simple statistical model for parton distribution of proton. The recent observed Bjorken-$x$ dependent light flavor sea quark asymmetry $\bar{d}(x)-\bar{u}(x)$ can be well reproduced by Monte Carlo simulation as a pure statistical effect. |
1602.04818 | Guy D. Moore | Leesa M. Fleury, Guy D. Moore | Axion String Dynamics I: 2+1D | 22 pages plus two appendices; 15 figures. Version 2 adds minor
clarifications and catches a few typos, no substantive changes. Published
version | null | 10.1088/1475-7516/2016/05/005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If the axion exists and if the initial axion field value is uncorrelated at
causally disconnected points, then it should be possible to predict the
efficiency of cosmological axion production, relating the axionic dark matter
density to the axion mass. The main obstacle to making this prediction is
correctly treating the axion string cores. We develop a new algorithm for
treating the axionic string cores correctly in 2+1 dimensions. When the axionic
string cores are given their full physical string tension, axion production is
about twice as efficient as in previous simulations. We argue that the string
network in 2+1 dimensions should behave very differently than in 3+1
dimensions, so this result cannot be simply carried over to the physical case.
We outline how to extend our method to 3+1D axion string dynamics.
| [
{
"created": "Mon, 15 Feb 2016 21:00:04 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Apr 2016 13:40:24 GMT",
"version": "v2"
}
] | 2016-05-25 | [
[
"Fleury",
"Leesa M.",
""
],
[
"Moore",
"Guy D.",
""
]
] | If the axion exists and if the initial axion field value is uncorrelated at causally disconnected points, then it should be possible to predict the efficiency of cosmological axion production, relating the axionic dark matter density to the axion mass. The main obstacle to making this prediction is correctly treating the axion string cores. We develop a new algorithm for treating the axionic string cores correctly in 2+1 dimensions. When the axionic string cores are given their full physical string tension, axion production is about twice as efficient as in previous simulations. We argue that the string network in 2+1 dimensions should behave very differently than in 3+1 dimensions, so this result cannot be simply carried over to the physical case. We outline how to extend our method to 3+1D axion string dynamics. |
hep-ph/0607202 | Bernd Kniehl | B.A. Kniehl, A.V. Kotikov, A.I. Onishchenko, O.L. Veretin | Strong-Coupling Constant with Flavor Thresholds at Five Loops in the
MS-bar Scheme | 10 pages, 2 figures, to appear in Phys. Rev. Lett | Phys.Rev.Lett. 97 (2006) 042001 | 10.1103/PhysRevLett.97.042001 | DESY 06-074 | hep-ph | null | We present in analytic form the matching conditions for the strong-coupling
constant alpha_s^(n_f)(mu) at the flavor thresholds to four loops in the
modified minimal-subtraction scheme. Taking into account the present knowledge
on the coefficient beta_4 of the Callan-Symanzik beta function of quantum
chromo-dynamics, we thus derive a five-loop formula for alpha_s^(n_f)(mu)
together with appropriate relationships between the asymptotic scale parameters
Lambda^(n_f) for different numbers of flavors n_f.
| [
{
"created": "Tue, 18 Jul 2006 18:58:24 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Kniehl",
"B. A.",
""
],
[
"Kotikov",
"A. V.",
""
],
[
"Onishchenko",
"A. I.",
""
],
[
"Veretin",
"O. L.",
""
]
] | We present in analytic form the matching conditions for the strong-coupling constant alpha_s^(n_f)(mu) at the flavor thresholds to four loops in the modified minimal-subtraction scheme. Taking into account the present knowledge on the coefficient beta_4 of the Callan-Symanzik beta function of quantum chromo-dynamics, we thus derive a five-loop formula for alpha_s^(n_f)(mu) together with appropriate relationships between the asymptotic scale parameters Lambda^(n_f) for different numbers of flavors n_f. |
1807.01607 | Bingfang Yang | Bingfang Yang, Huaying Zhang, Biaofeng Hou, Ning Liu | T-odd top partner pair production in the dilepton final states at the
LHC in the littlest Higgs Model with T-parity | typos corrected, calculations and results are updated. arXiv admin
note: text overlap with arXiv:1706.02821 | Chinese Physics C Vol. 42, No. 10 (2018) 103102 | 10.1088/1674-1137/42/10/103102 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the littlest Higgs Model with T-parity, we discuss the pair production of
the T-odd top partner ($T_{-}$) which decays almost 100\% into the top quark
and the lightest T-odd particle ($A_{H}$). Considering the current constraints,
we investigate the observability of the T-odd top partner pair production
through the process $pp\rightarrow T_{-}\bar{T}_{-}\rightarrow
t\bar{t}A_{H}A_{H}$ in final states with two leptons at 14 TeV LHC. We analyze
the signal significance and find that the lower limit on the T-odd top partner
mass are about 1.04 TeV, 1.14 TeV, 1.23 TeV at $2\sigma$ confidence level at
14TeV LHC with the integrated luminosity of 30 fb$^{-1}$, 100fb$^{-1}$,
300fb$^{-1}$. This lower limit can be raised to about 1.34(1.44) TeV if we use
1000(3000) fb$^{-1}$ of integrated luminosity.
| [
{
"created": "Tue, 3 Jul 2018 12:49:50 GMT",
"version": "v1"
},
{
"created": "Mon, 6 May 2019 14:41:40 GMT",
"version": "v2"
}
] | 2019-05-08 | [
[
"Yang",
"Bingfang",
""
],
[
"Zhang",
"Huaying",
""
],
[
"Hou",
"Biaofeng",
""
],
[
"Liu",
"Ning",
""
]
] | In the littlest Higgs Model with T-parity, we discuss the pair production of the T-odd top partner ($T_{-}$) which decays almost 100\% into the top quark and the lightest T-odd particle ($A_{H}$). Considering the current constraints, we investigate the observability of the T-odd top partner pair production through the process $pp\rightarrow T_{-}\bar{T}_{-}\rightarrow t\bar{t}A_{H}A_{H}$ in final states with two leptons at 14 TeV LHC. We analyze the signal significance and find that the lower limit on the T-odd top partner mass are about 1.04 TeV, 1.14 TeV, 1.23 TeV at $2\sigma$ confidence level at 14TeV LHC with the integrated luminosity of 30 fb$^{-1}$, 100fb$^{-1}$, 300fb$^{-1}$. This lower limit can be raised to about 1.34(1.44) TeV if we use 1000(3000) fb$^{-1}$ of integrated luminosity. |
hep-ph/0008194 | Pankaj Jain | John P. Ralston, Pankaj Jain, Bijoy Kundu and Jim Samuelsson | Progress in Perturbative Color Transparency | 4 pages, no figures. to appear in the CIPANP2000 Proceedings | AIP Conf.Proc. 549 (2002) 455-458 | 10.1063/1.1345295 | null | hep-ph | null | A brief overview of the status of color transparency experiments is
presented. We report on the first complete calculations of color transparency
within a perturbative QCD framework. We also comment on the underlying
factorization method and assumptions. Detailed calculations show that the slope
of the transparency ratio with $Q^2$, and the effective attenuation cross
sections extracted from color transparency experiments depend on the $x$
distribuition of wave functions.
| [
{
"created": "Fri, 18 Aug 2000 03:03:30 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Ralston",
"John P.",
""
],
[
"Jain",
"Pankaj",
""
],
[
"Kundu",
"Bijoy",
""
],
[
"Samuelsson",
"Jim",
""
]
] | A brief overview of the status of color transparency experiments is presented. We report on the first complete calculations of color transparency within a perturbative QCD framework. We also comment on the underlying factorization method and assumptions. Detailed calculations show that the slope of the transparency ratio with $Q^2$, and the effective attenuation cross sections extracted from color transparency experiments depend on the $x$ distribuition of wave functions. |
hep-ph/9704225 | Bhaskar Dutta | D. A. Dicus, B. Dutta, and S. Nandi | Scalar tau Signal at LEP 2 in models with Gauge Mediated Supersymmetry
Breaking | 19 pages(Latex), 5 Figures, a few comments have been added, final
version of which will appear in Phys. Rev. D | Phys.Rev.D56:5748-5753,1997 | 10.1103/PhysRevD.56.5748 | DOE-ER40757-097,UTEXAS-HEP-97-6,OITS-624,OSURN-323 | hep-ph | null | In theories with gauge mediated supersymmetry breaking, the scalar tau,
(${\tilde \tau_1}$) is the lightest observable superpartner for part of the
parameter space. At LEP 2, the production of such a $\tilde \tau_1$ pair and
their subsequent decays give rise to a pair of $\tau$ leptons plus missing
energy from the unobserved gravitinos. The angular distributions of the
$\tau$'s are different from those arising from the production and decay of W
pairs, and thus will constitute an interesting signal for supersymmetry. We
also consider ${\tilde \tau_1}$ pair production in the complementary part of
parameter space where the lightest neutralino is lighter than the $\tilde
\tau_1$.
| [
{
"created": "Thu, 3 Apr 1997 22:44:55 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Oct 1997 00:40:21 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Dicus",
"D. A.",
""
],
[
"Dutta",
"B.",
""
],
[
"Nandi",
"S.",
""
]
] | In theories with gauge mediated supersymmetry breaking, the scalar tau, (${\tilde \tau_1}$) is the lightest observable superpartner for part of the parameter space. At LEP 2, the production of such a $\tilde \tau_1$ pair and their subsequent decays give rise to a pair of $\tau$ leptons plus missing energy from the unobserved gravitinos. The angular distributions of the $\tau$'s are different from those arising from the production and decay of W pairs, and thus will constitute an interesting signal for supersymmetry. We also consider ${\tilde \tau_1}$ pair production in the complementary part of parameter space where the lightest neutralino is lighter than the $\tilde \tau_1$. |
1212.3221 | David London | David London | Extracting Weak Phases Cleanly from Charmless 3-Body B Decays | 6 pages, 2 figures. Proceedings of CKM 2012, the 7th International
Workshop on the CKM Unitarity Triangle, University of Cincinnati, USA, 28
September - 2 October 2012 | null | null | UdeM-GPP-TH-12-216 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the past, it was believed that one cannot obtain clean weak-phase
information from the measurement of CP-violating asymmetries in 3-body B
decays. Recently it was shown that this is not true -- by expressing the decay
amplitudes in terms of diagrams and using Dalitz plots, one can resolve all the
difficulties and cleanly extract weak phases. In this talk I describe how this
is done, and present preliminary results on the measurement of gamma using the
decays B -> K pi pi and B -> K Kbar K.
| [
{
"created": "Thu, 13 Dec 2012 17:08:57 GMT",
"version": "v1"
}
] | 2012-12-14 | [
[
"London",
"David",
""
]
] | In the past, it was believed that one cannot obtain clean weak-phase information from the measurement of CP-violating asymmetries in 3-body B decays. Recently it was shown that this is not true -- by expressing the decay amplitudes in terms of diagrams and using Dalitz plots, one can resolve all the difficulties and cleanly extract weak phases. In this talk I describe how this is done, and present preliminary results on the measurement of gamma using the decays B -> K pi pi and B -> K Kbar K. |
hep-ph/9708334 | Gudrun Heinrich | Gudrun Heinrich, Zoltan Kunszt (ETH Zuerich) | Two-loop anomalous dimension in light-cone gauge with
Mandelstam-Leibbrandt prescription | 31 pages, LaTeX | Nucl.Phys. B519 (1998) 405-432 | 10.1016/S0550-3213(98)00089-3 | ETH-TH/97-18 | hep-ph | null | All the next-to-leading order results on Altarelli-Parisi splitting functions
have been obtained in the literature either by using the operator product
expansion method or by making use of the Curci Furmanski Petronzio (CFP)
formalism in conjunction with light-like axial gauge, principal value (PV)
prescription and dimensional regularization. In this paper we present the
calculation of some non-singlet two-loop anomalous dimensions within the CFP
formalism using light-cone axial gauge with Mandelstam-Leibbrandt (ML)
prescription. We make a detailed comparison between the intermediate results
given by the (PV) versus the (ML) method. We point out that the (ML) method is
completely consistent and avoids the ``phenomenological rules'' used in the
case of (PV) regularization.
| [
{
"created": "Wed, 13 Aug 1997 11:49:01 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Heinrich",
"Gudrun",
"",
"ETH Zuerich"
],
[
"Kunszt",
"Zoltan",
"",
"ETH Zuerich"
]
] | All the next-to-leading order results on Altarelli-Parisi splitting functions have been obtained in the literature either by using the operator product expansion method or by making use of the Curci Furmanski Petronzio (CFP) formalism in conjunction with light-like axial gauge, principal value (PV) prescription and dimensional regularization. In this paper we present the calculation of some non-singlet two-loop anomalous dimensions within the CFP formalism using light-cone axial gauge with Mandelstam-Leibbrandt (ML) prescription. We make a detailed comparison between the intermediate results given by the (PV) versus the (ML) method. We point out that the (ML) method is completely consistent and avoids the ``phenomenological rules'' used in the case of (PV) regularization. |
hep-ph/9905529 | Yeong Gyun Kim | C. S. Kim, Yeong Gyun Kim (Yonsei U.) | $b \to s \gamma$ decays in the Left-Right Symmetric Model | 16 pages with 7 figures, Version to be published in PRD | Phys.Rev. D61 (2000) 054008 | 10.1103/PhysRevD.61.054008 | YUMS 99-012 | hep-ph | null | We consider $b \to s \gamma$ decays in the Left-Right Symmetric Model. Values
of observables sensitive to chiral structure such as the $\Lambda$ polarization
in the $\Lambda_b \to \Lambda \gamma$ decays and the mixing-induced CP
asymmetries in the $B_{d,s} \to M^0 \gamma$ decays can deviate in the LRSM
significantly from the SM values. The combined analysis of $P_\Lambda$ and
$A_{CP}$ as well as ${\cal BR}(b \to s \gamma)$ can be used to determine the
model parameters.
| [
{
"created": "Fri, 28 May 1999 08:11:48 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Nov 1999 05:44:26 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Kim",
"C. S.",
"",
"Yonsei U."
],
[
"Kim",
"Yeong Gyun",
"",
"Yonsei U."
]
] | We consider $b \to s \gamma$ decays in the Left-Right Symmetric Model. Values of observables sensitive to chiral structure such as the $\Lambda$ polarization in the $\Lambda_b \to \Lambda \gamma$ decays and the mixing-induced CP asymmetries in the $B_{d,s} \to M^0 \gamma$ decays can deviate in the LRSM significantly from the SM values. The combined analysis of $P_\Lambda$ and $A_{CP}$ as well as ${\cal BR}(b \to s \gamma)$ can be used to determine the model parameters. |
hep-ph/0703252 | Khamidbi Beshtoev Mukhamedovich | Kh. M. Beshtoev | Importance of the Mechanism of Resonance Enhancement of Neutrino
Oscillations in Matter for the Precise Testing of the Electroweak Interaction
Model. Present Experimental Status of This Resonance Mechanism | 27 pages, 5 figures | null | null | null | hep-ph | null | The mechanism of resonance enhancement of neutrino oscillations in matter and
some critical remarks to this mechanism are considered. Using of this resonance
mechanism is very important to examine the model of electroweak interactions
since the processes induced by this mechanism grow multiply. In contrast to the
electromagnetic and strong interactions in weak interactions, $P$-parity is
violated therefore a problem of mass generations in the weak interactions is
considered (the interaction must be left-right symmetric for mass generations).
It is concluded that a possibility of mass generation in the framework of the
weak interactions is not proved. The present experimental status of this
resonance mechanism is considered and it is done conclusion that this effect
has no clear experimental confirmation. For this purpose it is necessary to
fulfil precision experiments with solar neutrinos and the neutrinos passed
through the Earth matter.
| [
{
"created": "Fri, 23 Mar 2007 15:58:47 GMT",
"version": "v1"
}
] | 2009-01-01 | [
[
"Beshtoev",
"Kh. M.",
""
]
] | The mechanism of resonance enhancement of neutrino oscillations in matter and some critical remarks to this mechanism are considered. Using of this resonance mechanism is very important to examine the model of electroweak interactions since the processes induced by this mechanism grow multiply. In contrast to the electromagnetic and strong interactions in weak interactions, $P$-parity is violated therefore a problem of mass generations in the weak interactions is considered (the interaction must be left-right symmetric for mass generations). It is concluded that a possibility of mass generation in the framework of the weak interactions is not proved. The present experimental status of this resonance mechanism is considered and it is done conclusion that this effect has no clear experimental confirmation. For this purpose it is necessary to fulfil precision experiments with solar neutrinos and the neutrinos passed through the Earth matter. |
1912.07156 | Jun He Prof. | Xiao-Yun Wang, Jun He, Xurong Chen | Systematic study on production of hidden-bottom pentaquark via $\gamma
p$ and $\pi ^{-}p$ scatterings | 7 pages, 7 figures | Phys. Rev. D 101, 034032 (2020) | 10.1103/PhysRevD.101.034032 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The production of hidden-bottom pentaquark $P_{b}$ states via $\gamma p$ and
$\pi ^{-}p$ scatterings is studied within an effective Lagrangian approach and
the vector-meson-dominance mechnism. For the $P_{b}$ production in the process
$\gamma p\rightarrow \Upsilon p$, the dipole Pomeron model is employed to
calculate the background contribution, and the experimental data can be well
described. For the process $\pi ^{-}p\rightarrow \Upsilon n$, the Reggeized
$t$-channel with $\pi $ exchange is considered as the main background for the
$P_{b}$ production. Near the threshold, two-peak structure from the states
$P_{b (11080)$ and $P_{b}(11125)$ can be observed if energy bin width is chosen
as 0.01 GeV, and the same result is obtained in the $\pi ^{-}p$ scattering.
Moreover, by taking the branching ratio of Br$[{P_{b}\rightarrow \pi N}]\simeq
0.05\%$, the numerical result shows that the average value of cross section
from the $P_{b}(11080)$ state produced in the $\gamma p$ or $\pi ^{-}p$
scattering reaches at least 0.1 nb with a bin of 0.1 GeV. Even if we reduce the
branching ratio of the $P_{b}$ state into $\pi N$ channel by one order, the
theoretical average of the cross section from $P_{b}(11080)$ production in $\pi
^{-}p$ scattering can reach the order of 0.01 nb with a bin of 0.1 GeV, which
means that the signal can still be clearly distinguished from the background.
The experimental measurements and studies on the hidden-bottom pentaquark
$P_{b}$ state production in the $\gamma p $ or $\pi ^{-}p$ scattering
near-threshold energy region around $W\simeq 11$ GeV are strongly suggested,
which are accessible at COMPASS and JPARC. Particularly, the result of the
photoproduction suggests that it is very promising to observe the hidden-bottom
pentaquark at proposed EicC facility in China.
| [
{
"created": "Mon, 16 Dec 2019 01:58:22 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Jul 2020 10:31:50 GMT",
"version": "v2"
}
] | 2020-07-16 | [
[
"Wang",
"Xiao-Yun",
""
],
[
"He",
"Jun",
""
],
[
"Chen",
"Xurong",
""
]
] | The production of hidden-bottom pentaquark $P_{b}$ states via $\gamma p$ and $\pi ^{-}p$ scatterings is studied within an effective Lagrangian approach and the vector-meson-dominance mechnism. For the $P_{b}$ production in the process $\gamma p\rightarrow \Upsilon p$, the dipole Pomeron model is employed to calculate the background contribution, and the experimental data can be well described. For the process $\pi ^{-}p\rightarrow \Upsilon n$, the Reggeized $t$-channel with $\pi $ exchange is considered as the main background for the $P_{b}$ production. Near the threshold, two-peak structure from the states $P_{b (11080)$ and $P_{b}(11125)$ can be observed if energy bin width is chosen as 0.01 GeV, and the same result is obtained in the $\pi ^{-}p$ scattering. Moreover, by taking the branching ratio of Br$[{P_{b}\rightarrow \pi N}]\simeq 0.05\%$, the numerical result shows that the average value of cross section from the $P_{b}(11080)$ state produced in the $\gamma p$ or $\pi ^{-}p$ scattering reaches at least 0.1 nb with a bin of 0.1 GeV. Even if we reduce the branching ratio of the $P_{b}$ state into $\pi N$ channel by one order, the theoretical average of the cross section from $P_{b}(11080)$ production in $\pi ^{-}p$ scattering can reach the order of 0.01 nb with a bin of 0.1 GeV, which means that the signal can still be clearly distinguished from the background. The experimental measurements and studies on the hidden-bottom pentaquark $P_{b}$ state production in the $\gamma p $ or $\pi ^{-}p$ scattering near-threshold energy region around $W\simeq 11$ GeV are strongly suggested, which are accessible at COMPASS and JPARC. Particularly, the result of the photoproduction suggests that it is very promising to observe the hidden-bottom pentaquark at proposed EicC facility in China. |
1601.04789 | Yu Muramatsu | Nobuhiro Maekawa, Yu Muramatsu | Flavor changing nucleon decay | 5 pages, 4 figures v2:references are added v3:references, figures and
texts are improved v4:final version to be published in PLB | null | 10.1016/j.physletb.2017.02.028 | KIAS-16009 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent discovery of neutrino large mixings implies the large mixings in the
diagonalizing matrices of $\bf\bar 5$ fields in $SU(5)$ grand unified theory
(GUT), while the diagonalizing matrices of $\bf 10$ fields of $SU(5)$ are
expected to have small mixings like Cabibbo-Kobayashi-Maskawa matrix. We
calculate the predictions of flavor changing nucleon decays (FCND) in $SU(5)$,
$SO(10)$, and $E_6$ GUT models which have the above features for mixings. We
found that FCND can be the main decay mode especially for GUT with higher rank
unification group. Recent report for $P\rightarrow \pi^0\mu^+$ process implies
$E_6$ or $SO(10)$ GUT if the signal is from the nucleon decay.
| [
{
"created": "Tue, 19 Jan 2016 03:58:00 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Feb 2016 14:44:34 GMT",
"version": "v2"
},
{
"created": "Wed, 7 Dec 2016 10:02:29 GMT",
"version": "v3"
},
{
"created": "Wed, 22 Feb 2017 18:25:11 GMT",
"version": "v4"
}
] | 2017-02-23 | [
[
"Maekawa",
"Nobuhiro",
""
],
[
"Muramatsu",
"Yu",
""
]
] | Recent discovery of neutrino large mixings implies the large mixings in the diagonalizing matrices of $\bf\bar 5$ fields in $SU(5)$ grand unified theory (GUT), while the diagonalizing matrices of $\bf 10$ fields of $SU(5)$ are expected to have small mixings like Cabibbo-Kobayashi-Maskawa matrix. We calculate the predictions of flavor changing nucleon decays (FCND) in $SU(5)$, $SO(10)$, and $E_6$ GUT models which have the above features for mixings. We found that FCND can be the main decay mode especially for GUT with higher rank unification group. Recent report for $P\rightarrow \pi^0\mu^+$ process implies $E_6$ or $SO(10)$ GUT if the signal is from the nucleon decay. |
1802.06649 | Minoru Eto | Masato Arai, Filip Blaschke, Minoru Eto, Norisuke Sakai | Localization of the Standard Model via Higgs mechanism and a finite
electroweak monopole from non-compact five dimensions | 32 pages, 2 figure, v2: references added, typos corrected. v3: Almost
final version to be published by PTEP. Evaluation of lower bound of KK quark
masses is added. Appendix C is added | Prog Theor Exp Phys (2018) | 10.1093/ptep/pty083 | YGHP-18-03 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a minimal and self-contained model in non-compact flat five
dimensions which localizes the Standard Model (SM) on a domain wall.
Localization of gauge fields is achieved by the condensation of Higgs field via
a Higgs dependent gauge kinetic term in five-dimensional Lagrangian. The domain
wall connecting vacua with unbroken gauge symmetry drives the Higgs
condensation which provides both electroweak symmetry breaking and gauge field
localization at the same time. Our model predicts higher-dimensional
interactions $|H|^{2n}(F_{\mu\nu})^2$ in the low-energy effective theory. This
leads to two expectations: The one is a new tree-level contribution to $H \to
\gamma\gamma$ ($H \to gg$) decay whose signature is testable in future LHC
experiment. The other is a finite electroweak monopole which may be accessible
to the MoEDAL experiment. Interactions of translational Nambu-Goldstone boson
is shown to satisfy a low-energy theorem.
| [
{
"created": "Mon, 19 Feb 2018 14:38:40 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Feb 2018 04:16:28 GMT",
"version": "v2"
},
{
"created": "Tue, 10 Jul 2018 07:55:54 GMT",
"version": "v3"
}
] | 2019-12-06 | [
[
"Arai",
"Masato",
""
],
[
"Blaschke",
"Filip",
""
],
[
"Eto",
"Minoru",
""
],
[
"Sakai",
"Norisuke",
""
]
] | We propose a minimal and self-contained model in non-compact flat five dimensions which localizes the Standard Model (SM) on a domain wall. Localization of gauge fields is achieved by the condensation of Higgs field via a Higgs dependent gauge kinetic term in five-dimensional Lagrangian. The domain wall connecting vacua with unbroken gauge symmetry drives the Higgs condensation which provides both electroweak symmetry breaking and gauge field localization at the same time. Our model predicts higher-dimensional interactions $|H|^{2n}(F_{\mu\nu})^2$ in the low-energy effective theory. This leads to two expectations: The one is a new tree-level contribution to $H \to \gamma\gamma$ ($H \to gg$) decay whose signature is testable in future LHC experiment. The other is a finite electroweak monopole which may be accessible to the MoEDAL experiment. Interactions of translational Nambu-Goldstone boson is shown to satisfy a low-energy theorem. |
2212.06978 | Stephen Parke | Stephen J. Parke | Non-adiabatic Level Crossing in Resonant Neutrino Oscillations | Matches version published in journal | Phys.Rev.Lett. 57 (1986) 1275-1278 | 10.1103/PhysRevLett.57.1275 | Fermilab-Pub-86-067-T | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Analytic results are presented for the probability of detecting an electron
neutrino after passage through a resonant oscillation region. If the electron
neutrino is produced far above the resonance density, this probability is
simply given by $\langle \,P_{\nu_e} \, \rangle \approx \sin^2 \theta_0+
P_\text{x} \cos 2 \theta_0$, where $\theta_0$ is the vacuum mixing angle. The
probability is averaged over the production as well as the detection positions
of the neutrino and $P_\text{x} $ is the Landau-Zener transition probability
between adiabatic states. Finally, this result is applied to resonance
oscillations within the solar interior.
| [
{
"created": "Wed, 14 Dec 2022 02:09:16 GMT",
"version": "v1"
}
] | 2022-12-15 | [
[
"Parke",
"Stephen J.",
""
]
] | Analytic results are presented for the probability of detecting an electron neutrino after passage through a resonant oscillation region. If the electron neutrino is produced far above the resonance density, this probability is simply given by $\langle \,P_{\nu_e} \, \rangle \approx \sin^2 \theta_0+ P_\text{x} \cos 2 \theta_0$, where $\theta_0$ is the vacuum mixing angle. The probability is averaged over the production as well as the detection positions of the neutrino and $P_\text{x} $ is the Landau-Zener transition probability between adiabatic states. Finally, this result is applied to resonance oscillations within the solar interior. |
1310.4518 | Marcin Badziak | Marcin Badziak, Marek Olechowski, Stefan Pokorski | 125 GeV Higgs and enhanced diphoton signal of a light singlet-like
scalar in NMSSM | 7 pages, 3 figures, to appear in the Proceedings of The European
Physical Society Conference on High Energy Physics (EPS-HEP2013), 18-24 July
2013, Stockholm, Sweden, mainly based on arXiv:1304.5437 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | NMSSM with a light singlet-like scalar and strongly suppressed couplings to
$b$ and $\tau$ is investigated. It is shown that in such a scenario the
singlet-like scalar to diphoton signal can be larger than for the SM Higgs for
a wide range of masses between 60 and 110 GeV, in agreement with all the LEP
and LHC data. Enhancement of the singlet-like scalar to diphoton signal is
correlated with positive correction to the SM-like Higgs mass from mixing
between SM-like Higgs and the singlet. It is also shown that the couplings to
$b$ and $\tau$ and, in consequence, branching ratios of the SM-like Higgs are
anti-correlated with those of the singlet-like scalar. If the singlet-like
scalar to diphoton signal is enhanced, the signal strengths of the 125 GeV
Higgs in the diphoton and $WW^*/ZZ^*$ channels are predicted to be smaller than
for the SM Higgs.
| [
{
"created": "Wed, 16 Oct 2013 20:32:07 GMT",
"version": "v1"
}
] | 2013-10-18 | [
[
"Badziak",
"Marcin",
""
],
[
"Olechowski",
"Marek",
""
],
[
"Pokorski",
"Stefan",
""
]
] | NMSSM with a light singlet-like scalar and strongly suppressed couplings to $b$ and $\tau$ is investigated. It is shown that in such a scenario the singlet-like scalar to diphoton signal can be larger than for the SM Higgs for a wide range of masses between 60 and 110 GeV, in agreement with all the LEP and LHC data. Enhancement of the singlet-like scalar to diphoton signal is correlated with positive correction to the SM-like Higgs mass from mixing between SM-like Higgs and the singlet. It is also shown that the couplings to $b$ and $\tau$ and, in consequence, branching ratios of the SM-like Higgs are anti-correlated with those of the singlet-like scalar. If the singlet-like scalar to diphoton signal is enhanced, the signal strengths of the 125 GeV Higgs in the diphoton and $WW^*/ZZ^*$ channels are predicted to be smaller than for the SM Higgs. |
1811.03332 | Teppei Kitahara | Teppei Kitahara | Recent developments on direct $CP$ violation in the kaon system and
connection to $K \to \pi \nu \bar{\nu}$ measurements | 8 pages, 3 figures; Contribution to proceedings of XIV International
Conference on Heavy Quarks and Leptons (HQL2018), Yamagata Terrsa, Japan, May
27- June 1, 2018. arXiv admin note: text overlap with arXiv:1705.05462 | null | null | null | hep-ph | http://creativecommons.org/publicdomain/zero/1.0/ | The first lattice result from the RBC and UKQCD Collaborations and improved
perturbative calculations of $\varepsilon^{\prime}_K / \varepsilon_K$ have
implied that the Standard-Model (SM) expectation deviates from measured values
at the $2.8\,\sigma$ level. Since $\varepsilon^{\prime}_K / \varepsilon_K$
comes from $CP$-violating FCNC and is significantly suppressed in the SM, the
discrepancy can be explained easily in several new physics (NP) models. In this
contribution, it is shown that correlations with the other rare decays,
especially $K\to \pi \nu \overline{\nu}$ and $K_S \to \mu^+ \mu^-$, are crucial
for discrimination of the NP models. These channels can be probed precisely in
the future by the NA62 and KOTO experiments for $K\to \pi \nu \overline{\nu}$
and LHCb experiment for $K_S \to \mu^+ \mu^-$.
| [
{
"created": "Thu, 8 Nov 2018 09:47:12 GMT",
"version": "v1"
}
] | 2018-11-09 | [
[
"Kitahara",
"Teppei",
""
]
] | The first lattice result from the RBC and UKQCD Collaborations and improved perturbative calculations of $\varepsilon^{\prime}_K / \varepsilon_K$ have implied that the Standard-Model (SM) expectation deviates from measured values at the $2.8\,\sigma$ level. Since $\varepsilon^{\prime}_K / \varepsilon_K$ comes from $CP$-violating FCNC and is significantly suppressed in the SM, the discrepancy can be explained easily in several new physics (NP) models. In this contribution, it is shown that correlations with the other rare decays, especially $K\to \pi \nu \overline{\nu}$ and $K_S \to \mu^+ \mu^-$, are crucial for discrimination of the NP models. These channels can be probed precisely in the future by the NA62 and KOTO experiments for $K\to \pi \nu \overline{\nu}$ and LHCb experiment for $K_S \to \mu^+ \mu^-$. |
hep-ph/0409311 | A. A. Arkhipov | A. A. Arkhipov | The SELEX Measurements in the Unified Picture for Hadron Spectra | 16 pages, 5 figures, 2 tables | null | null | null | hep-ph hep-ex nucl-ex | null | We give an analysis of the experimental material presented by the SELEX
Collaboration to find the true place for the SELEX state $D_{sJ}^+$(2632) in
the unified picture for hadron spectra developed early. It is found that the
SELEX measurements are excellently incorporated in the unified picture for
hadron spectra. Our analysis shows that the measured values for the masses of
the SELEX state exactly coincide with the calculated masses of the states
living in the corresponding KK towers. We also found quite a natural but rather
model dependent explanation of the decay pattern for the SELEX state being
dominated by the $D_s^+\eta$ decay mode.
| [
{
"created": "Mon, 27 Sep 2004 20:34:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Arkhipov",
"A. A.",
""
]
] | We give an analysis of the experimental material presented by the SELEX Collaboration to find the true place for the SELEX state $D_{sJ}^+$(2632) in the unified picture for hadron spectra developed early. It is found that the SELEX measurements are excellently incorporated in the unified picture for hadron spectra. Our analysis shows that the measured values for the masses of the SELEX state exactly coincide with the calculated masses of the states living in the corresponding KK towers. We also found quite a natural but rather model dependent explanation of the decay pattern for the SELEX state being dominated by the $D_s^+\eta$ decay mode. |
1604.07740 | Dmitry Zhuridov Dr. | Dmitry Zhuridov | Baryogenesis from leptomesons | 16 pages, 4 figures. v4: minor corrections that do not effect the
results | Phys. Rev. D 94, 035007 (2016) | 10.1103/PhysRevD.94.035007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Various new physics models, e.g., theories of compositeness, can accommodate
the color singlet excited leptons that interact with the leptons, quarks,
leptoquarks, etc. A particular type of excited lepton, which at low energies
interacts with the Standard Model fermions mainly through the four-fermion
coupling to lepton and quark-antiquark (or lepton-antilepton) pair, we call
leptomeson. These new particles may contribute to variety of the experimental
anomalies such as the discrepancy in the muon g-2. We propose that the
leptomesons can generate also the baryon asymmetry that explains the imbalance
in ordinary matter and antimatter in the observable universe. We consider the
two types of scenarios for this baryogenesis via leptogenesis to occur from
either leptomeson oscillations or decays. Both possibilities do not contradict
to the small masses of the observable neutrinos and the proton stability.
Moreover they can be relevant for the near future collider experiments and do
not suffer from the gravitino problem.
| [
{
"created": "Tue, 26 Apr 2016 16:25:08 GMT",
"version": "v1"
},
{
"created": "Wed, 4 May 2016 14:38:21 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Jul 2016 10:07:43 GMT",
"version": "v3"
},
{
"created": "Wed, 2 Nov 2016 11:00:35 GMT",
"version": "v4"
}
] | 2016-11-03 | [
[
"Zhuridov",
"Dmitry",
""
]
] | Various new physics models, e.g., theories of compositeness, can accommodate the color singlet excited leptons that interact with the leptons, quarks, leptoquarks, etc. A particular type of excited lepton, which at low energies interacts with the Standard Model fermions mainly through the four-fermion coupling to lepton and quark-antiquark (or lepton-antilepton) pair, we call leptomeson. These new particles may contribute to variety of the experimental anomalies such as the discrepancy in the muon g-2. We propose that the leptomesons can generate also the baryon asymmetry that explains the imbalance in ordinary matter and antimatter in the observable universe. We consider the two types of scenarios for this baryogenesis via leptogenesis to occur from either leptomeson oscillations or decays. Both possibilities do not contradict to the small masses of the observable neutrinos and the proton stability. Moreover they can be relevant for the near future collider experiments and do not suffer from the gravitino problem. |
1309.7110 | Zack Sullivan | Edmond L. Berger, Zack Sullivan, Hao Zhang | LHC and Tevatron constraints on a W' model interpretation of the top
quark forward-backward asymmetry | 12 pages, revtex, 13 figures, to appear in PRD | Phys Rev D 88, 114026 (2013) | 10.1103/PhysRevD.88.114026 | ANL-HEP-PR-13-40, IIT-CAPP-13-05 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Aspects of a flavor-changing W' model with right-handed couplings are
addressed in this paper in light of Tevatron and LHC data. Our fit to the
Tevatron top-quark forward-backward asymmetry and the tt_bar inclusive cross
section includes higher-order loop effects in the effective interaction. The
higher order corrections change the best fit value of the W' effective coupling
strength as a function of the W' mass. The consistency of the model is checked
against the shape of the tt_bar invariant mass distribution. We use these
updated W' parameters to compute the expected contributions from W't associated
production and, for the first time, W'W' pair production at the LHC. We do a
full Monte Carlo simulation of the tt_bar+X final state, including interference
between the tW' induced tt_bar j process and the standard model tt_bar j
process. Interference effects are shown to be quantitatively important,
particularly when the W' mass is large. The jet multiplicity distribution in
tt_bar-jet production at 8 TeV constrains the W' model severely.
| [
{
"created": "Fri, 27 Sep 2013 03:46:32 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Nov 2013 16:49:12 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Berger",
"Edmond L.",
""
],
[
"Sullivan",
"Zack",
""
],
[
"Zhang",
"Hao",
""
]
] | Aspects of a flavor-changing W' model with right-handed couplings are addressed in this paper in light of Tevatron and LHC data. Our fit to the Tevatron top-quark forward-backward asymmetry and the tt_bar inclusive cross section includes higher-order loop effects in the effective interaction. The higher order corrections change the best fit value of the W' effective coupling strength as a function of the W' mass. The consistency of the model is checked against the shape of the tt_bar invariant mass distribution. We use these updated W' parameters to compute the expected contributions from W't associated production and, for the first time, W'W' pair production at the LHC. We do a full Monte Carlo simulation of the tt_bar+X final state, including interference between the tW' induced tt_bar j process and the standard model tt_bar j process. Interference effects are shown to be quantitatively important, particularly when the W' mass is large. The jet multiplicity distribution in tt_bar-jet production at 8 TeV constrains the W' model severely. |
0804.4751 | Jaime Alvarez-Muniz | J. Alvarez-Mu\~niz, J. Dias de Deus, C. Pajares | Strong colour fields and cosmic ray showers at ultra-high energies | 12 pages, 3 Figs | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that the increase of the ratio baryon/meson due to the presence of
strong colour fields and percolation in ultra-high energy hadronic collisions,
helps to explain some of the global features of ultra-high energy cosmic ray
cascades at E>10^18 eV and, in particular the observed excess in the number of
muons with respect to current models of hadronic interactions. A reasonable
agreement with the small value and slope of the average depth of shower maximum
Xmax vs shower energy -- as seen in data collected at the Pierre Auger
Observatory -- can be obtained with a fast increase of the p-Air production
cross-section compatible with the Froissart bound.
| [
{
"created": "Wed, 30 Apr 2008 08:03:25 GMT",
"version": "v1"
}
] | 2008-05-01 | [
[
"Alvarez-Muñiz",
"J.",
""
],
[
"de Deus",
"J. Dias",
""
],
[
"Pajares",
"C.",
""
]
] | We argue that the increase of the ratio baryon/meson due to the presence of strong colour fields and percolation in ultra-high energy hadronic collisions, helps to explain some of the global features of ultra-high energy cosmic ray cascades at E>10^18 eV and, in particular the observed excess in the number of muons with respect to current models of hadronic interactions. A reasonable agreement with the small value and slope of the average depth of shower maximum Xmax vs shower energy -- as seen in data collected at the Pierre Auger Observatory -- can be obtained with a fast increase of the p-Air production cross-section compatible with the Froissart bound. |
1508.04189 | Zhi-Gang Wang | Zhi-Gang Wang, Tao Huang | Analysis of the ${\frac{1}{2}}^{\pm}$ pentaquark states in the diquark
model with QCD sum rules | 20 pages, 17 figures. arXiv admin note: substantial text overlap with
arXiv:1508.01468 | Eur.Phys.J.C76 (2016) 43 | 10.1140/epjc/s10052-016-3880-8 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we present the scalar-diquark-scalar-diquark-antiquark type
and scalar-diquark-axialvector-diquark-antiquark type pentaquark configurations
in the diquark model, and study the masses and pole residues of the
$J^P={\frac{1}{2}}^\pm$ hidden-charmed pentaquark states in details with the
QCD sum rules by extending our previous work on the $J^P={\frac{3}{2}}^-$ and
${\frac{5}{2}}^{+}$ hidden-charmed pentaquark states. We calculate the
contributions of the vacuum condensates up to dimension-10 in the operator
product expansion by constructing both the
scalar-diquark-scalar-diquark-antiquark type and
scalar-diquark-axialvector-diquark-antiquark type interpolating currents. The
present predictions of the masses can be confronted to the LHCb experimental
data in the future.
| [
{
"created": "Tue, 18 Aug 2015 01:36:15 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Oct 2015 08:21:15 GMT",
"version": "v2"
},
{
"created": "Sat, 19 Dec 2015 13:35:55 GMT",
"version": "v3"
},
{
"created": "Sat, 23 Jan 2016 08:35:48 GMT",
"version": "v4"
}
] | 2016-01-28 | [
[
"Wang",
"Zhi-Gang",
""
],
[
"Huang",
"Tao",
""
]
] | In this article, we present the scalar-diquark-scalar-diquark-antiquark type and scalar-diquark-axialvector-diquark-antiquark type pentaquark configurations in the diquark model, and study the masses and pole residues of the $J^P={\frac{1}{2}}^\pm$ hidden-charmed pentaquark states in details with the QCD sum rules by extending our previous work on the $J^P={\frac{3}{2}}^-$ and ${\frac{5}{2}}^{+}$ hidden-charmed pentaquark states. We calculate the contributions of the vacuum condensates up to dimension-10 in the operator product expansion by constructing both the scalar-diquark-scalar-diquark-antiquark type and scalar-diquark-axialvector-diquark-antiquark type interpolating currents. The present predictions of the masses can be confronted to the LHCb experimental data in the future. |
hep-ph/0306017 | Sandhya Choubey | Sandhya Choubey, S.T. Petcov, M. Piai | Precision Neutrino Oscillation Physics with an Intermediate Baseline
Reactor Neutrino Experiment | 25 pages | Phys.Rev.D68:113006,2003 | 10.1103/PhysRevD.68.113006 | null | hep-ph astro-ph hep-ex nucl-ex | null | We discuss the physics potential of intermediate $L \sim 20 \div 30$ km
baseline experiments at reactor facilities, assuming that the solar neutrino
oscillation parameters $\Delta m^2_{\odot}$ and $\theta_{\odot}$ lie in the
high-LMA solution region. We show that such an intermediate baseline reactor
experiment can determine both $\Delta m^2_{\odot}$ and $\theta_{\odot}$ with a
remarkably high precision. We perform also a detailed study of the sensitivity
of the indicated experiment to $\Delta m^2_{\rm atm}$, which drives the
dominant atmospheric $\nu_{\mu}$ ($\bar{\nu}_{\mu}$) oscillations, and to
$\theta$ - the neutrino mixing angle limited by the data from the CHOOZ and
Palo Verde experiments. We find that this experiment can improve the bounds on
$\sin^2\theta$. If the value of $\sin^2\theta$ is large enough, $\sin^2\theta
\gtap 0.02$, the energy resolution of the detector is sufficiently good and if
the statistics is relatively high, it can determine with extremely high
precision the value of $\Delta m^2_{\rm atm}$. We also explore the potential of
the intermediate baseline reactor neutrino experiment for determining the type
of the neutrino mass spectrum, which can be with normal or inverted hierarchy.
We show that the conditions under which the type of neutrino mass hierarchy can
be determined are quite challenging, but are within the reach of the experiment
under discussion.
| [
{
"created": "Mon, 2 Jun 2003 13:31:14 GMT",
"version": "v1"
}
] | 2011-02-11 | [
[
"Choubey",
"Sandhya",
""
],
[
"Petcov",
"S. T.",
""
],
[
"Piai",
"M.",
""
]
] | We discuss the physics potential of intermediate $L \sim 20 \div 30$ km baseline experiments at reactor facilities, assuming that the solar neutrino oscillation parameters $\Delta m^2_{\odot}$ and $\theta_{\odot}$ lie in the high-LMA solution region. We show that such an intermediate baseline reactor experiment can determine both $\Delta m^2_{\odot}$ and $\theta_{\odot}$ with a remarkably high precision. We perform also a detailed study of the sensitivity of the indicated experiment to $\Delta m^2_{\rm atm}$, which drives the dominant atmospheric $\nu_{\mu}$ ($\bar{\nu}_{\mu}$) oscillations, and to $\theta$ - the neutrino mixing angle limited by the data from the CHOOZ and Palo Verde experiments. We find that this experiment can improve the bounds on $\sin^2\theta$. If the value of $\sin^2\theta$ is large enough, $\sin^2\theta \gtap 0.02$, the energy resolution of the detector is sufficiently good and if the statistics is relatively high, it can determine with extremely high precision the value of $\Delta m^2_{\rm atm}$. We also explore the potential of the intermediate baseline reactor neutrino experiment for determining the type of the neutrino mass spectrum, which can be with normal or inverted hierarchy. We show that the conditions under which the type of neutrino mass hierarchy can be determined are quite challenging, but are within the reach of the experiment under discussion. |
hep-ph/0702231 | Pedro Fernando Simoes Costa | Pedro Costa, C. A. de Sousa, M. C. Ruivo, Yu. L. Kalinovsky | Phase transitions in quark matter and behaviour of physical observables
in the vicinity of the critical end point | Talk given at the IVth International Conference on Quarks and Nuclear
Physics (QNP06), Madrid, 5-10 June 2006 | Eur.Phys.J.A31:842-844,2007 | 10.1140/epja/i2006-10257-7 | null | hep-ph | null | We study the chiral phase transition at finite $T$ and $\mu_B$ within the
framework of the SU(3) Nambu-Jona-Lasinio (NJL) model. The QCD critical end
point (CEP) and the critical line at finite temperature and baryonic chemical
potential are investigated: the study of physical quantities, such as the
baryon number susceptibility near the CEP, will provide complementary
information concerning the order of the phase transition. We also analyze the
information provided by the study of the critical exponents around the CEP.
| [
{
"created": "Thu, 22 Feb 2007 13:51:47 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Costa",
"Pedro",
""
],
[
"de Sousa",
"C. A.",
""
],
[
"Ruivo",
"M. C.",
""
],
[
"Kalinovsky",
"Yu. L.",
""
]
] | We study the chiral phase transition at finite $T$ and $\mu_B$ within the framework of the SU(3) Nambu-Jona-Lasinio (NJL) model. The QCD critical end point (CEP) and the critical line at finite temperature and baryonic chemical potential are investigated: the study of physical quantities, such as the baryon number susceptibility near the CEP, will provide complementary information concerning the order of the phase transition. We also analyze the information provided by the study of the critical exponents around the CEP. |
1804.03266 | Jo\~ao Thiago Amaral | J. T. Amaral and V. M. Becker | Exclusive vector meson production with leading neutrons in a saturation
model for the dipole amplitude in mixed space | 9 Pages, 4 figures | Phys. Rev. D 97, 094026 (2018) | 10.1103/PhysRevD.97.094026 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We investigate $\rho$ vector meson production in $ep$ collisions at HERA with
leading neutrons in the dipole formalism. The interaction of the dipole and the
pion is described in a mixed-space approach, in which the dipole-pion
scattering amplitude is given by the Marquet-Peschanski-Soyez saturation model,
which is based on the travelling wave solutions of the nonlinear
Balitsky-Kovchegov equation. We estimate the magnitude of the absorption
effects and compare our results with a previous analysis of the same process in
full coordinate space. In contrast with this approach, the present study leads
to absorption $K$ factors in the range of those predicted by previous
theoretical studies on semi-inclusive processes.
| [
{
"created": "Mon, 9 Apr 2018 23:00:04 GMT",
"version": "v1"
},
{
"created": "Thu, 3 May 2018 23:16:39 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Jun 2018 21:57:24 GMT",
"version": "v3"
}
] | 2018-06-06 | [
[
"Amaral",
"J. T.",
""
],
[
"Becker",
"V. M.",
""
]
] | We investigate $\rho$ vector meson production in $ep$ collisions at HERA with leading neutrons in the dipole formalism. The interaction of the dipole and the pion is described in a mixed-space approach, in which the dipole-pion scattering amplitude is given by the Marquet-Peschanski-Soyez saturation model, which is based on the travelling wave solutions of the nonlinear Balitsky-Kovchegov equation. We estimate the magnitude of the absorption effects and compare our results with a previous analysis of the same process in full coordinate space. In contrast with this approach, the present study leads to absorption $K$ factors in the range of those predicted by previous theoretical studies on semi-inclusive processes. |
2312.14214 | Taiju Tanii | Nobuhiro Maekawa and Taiju Tanii | Tension between neutrino masses and gauge coupling unification in
natural grand unified theories | 26 pages, 1figure | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The natural grand unified theories solve various problems of the
supersymmetric grand unified theory and give realistic quark and lepton mass
matrices under the natural assumption that all terms allowed by the symmetry
are introduced with O(1) coefficients. However, because of the natural
assumption, it is difficult to achieve the gauge coupling unification without
tuning, while keeping neutrino masses at realistic values. In this paper, we
try to avoid this tension between the neutrino masses and the gauge coupling
unification, by introducing suppression factors for several terms. These
suppression factors can be understood by approximate symmetries in some of the
solutions. We show that one of the most important results in the natural GUT
scenario, that the nucleon decay mediated by superheavy gauge fields is
enhanced due to smaller unification scale while the nucleon decay mediated by
superheavy colored Higgs is suppressed, can change in those models proposed in
this paper.
| [
{
"created": "Thu, 21 Dec 2023 12:04:41 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Dec 2023 02:46:55 GMT",
"version": "v2"
}
] | 2023-12-27 | [
[
"Maekawa",
"Nobuhiro",
""
],
[
"Tanii",
"Taiju",
""
]
] | The natural grand unified theories solve various problems of the supersymmetric grand unified theory and give realistic quark and lepton mass matrices under the natural assumption that all terms allowed by the symmetry are introduced with O(1) coefficients. However, because of the natural assumption, it is difficult to achieve the gauge coupling unification without tuning, while keeping neutrino masses at realistic values. In this paper, we try to avoid this tension between the neutrino masses and the gauge coupling unification, by introducing suppression factors for several terms. These suppression factors can be understood by approximate symmetries in some of the solutions. We show that one of the most important results in the natural GUT scenario, that the nucleon decay mediated by superheavy gauge fields is enhanced due to smaller unification scale while the nucleon decay mediated by superheavy colored Higgs is suppressed, can change in those models proposed in this paper. |
0804.1750 | Damir Becirevic | Damir Becirevic, Svjetlana Fajfer and Jernej F. Kamenik | On the matrix elements of dB=0 operators in the heavy meson decay widths | 12 pages, 1 figure | Phys.Lett.B671:66-70,2009 | 10.1016/j.physletb.2008.11.063 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We determine the chiral corrections to the matrix elements of the Delta B=0
four-quark operators which are relevant to the studies of the ratios of
lifetimes of heavy-light mesons as well as to the power corrections to the
inclusive semileptonic heavy-to-light decays. The chiral logarithmic
corrections computed here can be combined with the forthcoming estimates of the
corresponding matrix elements on the lattice to provide the reliable physics
result of the well known bag-parameters B_(1,2) and epsilon_(1,2).
| [
{
"created": "Thu, 10 Apr 2008 16:31:50 GMT",
"version": "v1"
}
] | 2009-01-16 | [
[
"Becirevic",
"Damir",
""
],
[
"Fajfer",
"Svjetlana",
""
],
[
"Kamenik",
"Jernej F.",
""
]
] | We determine the chiral corrections to the matrix elements of the Delta B=0 four-quark operators which are relevant to the studies of the ratios of lifetimes of heavy-light mesons as well as to the power corrections to the inclusive semileptonic heavy-to-light decays. The chiral logarithmic corrections computed here can be combined with the forthcoming estimates of the corresponding matrix elements on the lattice to provide the reliable physics result of the well known bag-parameters B_(1,2) and epsilon_(1,2). |
0712.3506 | Christian Schwinn | Rutger Boels, Christian Schwinn, Stefan Weinzierl | Recent developments for multi-leg QCD amplitudes with massive particles | 5 pages, Contribution to the proceedings of RadCor07, 8th
International Symposium on Radiative Corrections, October 1-5, 2007,
Florence, Italy | PoSRADCOR2007:016,2007 | null | PITHA 07/24, SFB/CPP-07-92 | hep-ph hep-th | null | We review the extension of modern techniques for the calculation of helicity
amplitudes in QCD to massive particles. The focus is on the use of
supersymmetric Ward identites that relate amplitudes with massive quarks to
those with massive scalars, the application of on-shell recursion relations to
amplitudes with massive quarks and an extension of the CSW rules to massive
scalars.
| [
{
"created": "Thu, 20 Dec 2007 17:31:03 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Boels",
"Rutger",
""
],
[
"Schwinn",
"Christian",
""
],
[
"Weinzierl",
"Stefan",
""
]
] | We review the extension of modern techniques for the calculation of helicity amplitudes in QCD to massive particles. The focus is on the use of supersymmetric Ward identites that relate amplitudes with massive quarks to those with massive scalars, the application of on-shell recursion relations to amplitudes with massive quarks and an extension of the CSW rules to massive scalars. |
0706.4165 | Dmitry Zhuridov Dr. | A. Ali, A.V. Borisov, D.V. Zhuridov | Probing new physics in the Neutrinoless double beta decay using electron
angular correlation | 37 pages, 5 figures; crucial error in Appendix A is corrected that
reveals higher significance of the scalar part due to the P-wave effect, the
updates match Erratum submitted to PRD. arXiv admin note: text overlap with
arXiv:hep-ph/0606072 | Phys.Rev.D76:093009,2007 | 10.1103/PhysRevD.76.093009 | DESY 07-097 | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The angular correlation of the electrons emitted in the neutrinoless double
beta decay ($0\nu2\beta$) is presented using a general Lorentz invariant
effective Lagrangian for the leptonic and hadronic charged weak currents. We
show that the coefficient $K$ in the angular correlation $d\Gamma/d\cos \theta
\propto (1-K\cos \theta)$ is essentially independent of the nuclear matrix
element models and present its numerical values for the five nuclei of interest
($^{76}{Ge}$, $^{82}{Se}$, $^{100}{Mo}$, $^{130}{Te}$, and $^{136}{Xe}$),
assuming that the $0\nu2\beta$-decays in these nuclei are induced solely by a
light Majorana neutrino, $\nu_M$. This coefficient varies between $K=0.81$ (for
the $^{76}{Ge}$ nucleus) and $K=0.88$ (for the $^{82}{Se}$ and $^{100}{Mo}$
nuclei), calculated taking into account the effects from the nucleon recoil,
the $S$ and $P$-waves for the outgoing electrons and the electron mass.
Deviation of $K$ from its values derived here would indicate the presence of
New Physics (NP) in addition to a light Majorana neutrino, and we work out the
angular coefficients in several $\nu_M + {NP}$ scenarios for the $^{76}{Ge}$
nucleus. As an illustration of the correlations among the $0\nu2\beta$
observables (half-life $T_{1/2}$, the coefficient $K$, and the effective
Majorana neutrino mass $|< m>|$) and the parameters of the underlying NP model,
we analyze the left-right symmetric models, taking into account current
phenomenological bounds on the right-handed $W_R$-boson mass and the left-right
mixing parameter $\zeta$.
| [
{
"created": "Thu, 28 Jun 2007 08:42:53 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Sep 2007 15:31:18 GMT",
"version": "v2"
},
{
"created": "Wed, 16 Jan 2008 16:27:13 GMT",
"version": "v3"
},
{
"created": "Sat, 23 Apr 2022 06:55:36 GMT",
"version": "v4"
}
] | 2022-04-26 | [
[
"Ali",
"A.",
""
],
[
"Borisov",
"A. V.",
""
],
[
"Zhuridov",
"D. V.",
""
]
] | The angular correlation of the electrons emitted in the neutrinoless double beta decay ($0\nu2\beta$) is presented using a general Lorentz invariant effective Lagrangian for the leptonic and hadronic charged weak currents. We show that the coefficient $K$ in the angular correlation $d\Gamma/d\cos \theta \propto (1-K\cos \theta)$ is essentially independent of the nuclear matrix element models and present its numerical values for the five nuclei of interest ($^{76}{Ge}$, $^{82}{Se}$, $^{100}{Mo}$, $^{130}{Te}$, and $^{136}{Xe}$), assuming that the $0\nu2\beta$-decays in these nuclei are induced solely by a light Majorana neutrino, $\nu_M$. This coefficient varies between $K=0.81$ (for the $^{76}{Ge}$ nucleus) and $K=0.88$ (for the $^{82}{Se}$ and $^{100}{Mo}$ nuclei), calculated taking into account the effects from the nucleon recoil, the $S$ and $P$-waves for the outgoing electrons and the electron mass. Deviation of $K$ from its values derived here would indicate the presence of New Physics (NP) in addition to a light Majorana neutrino, and we work out the angular coefficients in several $\nu_M + {NP}$ scenarios for the $^{76}{Ge}$ nucleus. As an illustration of the correlations among the $0\nu2\beta$ observables (half-life $T_{1/2}$, the coefficient $K$, and the effective Majorana neutrino mass $|< m>|$) and the parameters of the underlying NP model, we analyze the left-right symmetric models, taking into account current phenomenological bounds on the right-handed $W_R$-boson mass and the left-right mixing parameter $\zeta$. |
hep-ph/0104204 | Mustafa Savci | T. M. aliev, A. Ozpineci, M. Savci | The (Sigma^0 Lambda) Transition Magnetic Moment in Light Cone QCD Sum
Rules | 11 pp, 2 figures (postscript formatted), LaTex formatted | Phys.Lett. B516 (2001) 299-306 | 10.1016/S0370-2693(01)00942-X | metu-phys-hep-ph-01-18 | hep-ph | null | Using the general form of the (Sigma^0) and (Lambda) currents, the
(Sigma^0-Lambda) transition magnetic moment is calculated in framework of the
light cone QCD sum rules. A comparison of our result on this quantity with the
existing theoretical results and experimental data is presented.
| [
{
"created": "Fri, 20 Apr 2001 21:49:54 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jun 2001 18:11:42 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Mar 2003 21:27:55 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"aliev",
"T. M.",
""
],
[
"Ozpineci",
"A.",
""
],
[
"Savci",
"M.",
""
]
] | Using the general form of the (Sigma^0) and (Lambda) currents, the (Sigma^0-Lambda) transition magnetic moment is calculated in framework of the light cone QCD sum rules. A comparison of our result on this quantity with the existing theoretical results and experimental data is presented. |
1607.03309 | Shivaramakrishna Singirala | Shivaramakrishna Singirala | Implications of Fermionic Dark Matter on recent neutrino oscillation
data | 16 pages, 8 figures, to appear in Chinese Physics C | null | 10.1088/1674-1137/41/4/043102 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate flavor phenomenology and dark matter in the context of
scotogenic model. In this model, the neutrino masses are generated through
radiative corrections at one-loop level. Considering the neutrino mixing matrix
to be of tri-bimaximal form with additional perturbations to accommodate the
recently observed non-zero value of reactor mixing angle $\theta_{13}$, we
obtain the relation between various neutrino oscillation parameters and the
model parameters. Working in degenerate heavy neutrino mass spectrum, we obtain
light neutrino masses obeying normal hierarchy and also study the relic
abundance of fermionic dark matter candidate including co-annihilation effects.
A viable parameter space is thus obtained, consistent with neutrino oscillation
data, relic abundance and various lepton flavor violating decays such as
$\ell_\alpha\to\ell_\beta\gamma$ and $\ell_\alpha \to 3 \, \ell_\beta$.
| [
{
"created": "Tue, 12 Jul 2016 11:15:04 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jul 2016 04:18:40 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Dec 2016 03:41:01 GMT",
"version": "v3"
}
] | 2016-12-28 | [
[
"Singirala",
"Shivaramakrishna",
""
]
] | We investigate flavor phenomenology and dark matter in the context of scotogenic model. In this model, the neutrino masses are generated through radiative corrections at one-loop level. Considering the neutrino mixing matrix to be of tri-bimaximal form with additional perturbations to accommodate the recently observed non-zero value of reactor mixing angle $\theta_{13}$, we obtain the relation between various neutrino oscillation parameters and the model parameters. Working in degenerate heavy neutrino mass spectrum, we obtain light neutrino masses obeying normal hierarchy and also study the relic abundance of fermionic dark matter candidate including co-annihilation effects. A viable parameter space is thus obtained, consistent with neutrino oscillation data, relic abundance and various lepton flavor violating decays such as $\ell_\alpha\to\ell_\beta\gamma$ and $\ell_\alpha \to 3 \, \ell_\beta$. |
hep-ph/9604287 | Juan Antonio Aguilar Saavedra | J. A. Aguilar-Saavedra, M. Masip | Scale dependence of quark mass matrices in models with flavor symmetries | LaTeX, 14 pages, 4 figures, 3 tables. Uses epsf.sty. PostScript
available at http://deneb.ugr.es/papers/ugft60.ps.gz Plain LaTeX, Positions
of the figures corrected again | Phys.Rev. D54 (1996) 6903-6908 | 10.1103/PhysRevD.54.6903 | UG-FT-60/96 | hep-ph | null | Numerical correlations between fermion masses and mixings could indicate the
presence of a flavor symmetry at high energies. In general, the search for
these correlations using low-energy data requires an estimate of leading-log
radiative corrections. We present a complete analysis of the evolution between
the electroweak and the grand unification scales of quark mass parameters in
minimal supersymmetric models. We take $M_t=180$ GeV and consider all possible
values of $\tan \beta$. We also analize the possibility that the {\it top}
and/or the {\it bottom} Yukawa couplings result from an intermediate quasifixed
point (QFP) of the equations. We show that the quark mixings of the third
family do {\it not} have a QFP behaviour (in contrast to the masses, the
renormalization of all the mixings is linear), and we evaluate the low-energy
value of $V_{ub}$ which corresponds to $V_{ub}(M_X)=0$. Then we focus on the
renormalization-group corrections to {\it (i)} typical relations obtained in
models with flavor symmetries at the unification scale and {\it (ii)} a
superstring-motivated pattern of quark mass matrices. We show that in most of
the models the numerical prediction for $V_{ub}$ can be {\it corrected} in both
directions (by varying $\tan\beta$) due to {\it top} or {\it bottom} radiative
corrections.
| [
{
"created": "Thu, 11 Apr 1996 18:29:59 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Aguilar-Saavedra",
"J. A.",
""
],
[
"Masip",
"M.",
""
]
] | Numerical correlations between fermion masses and mixings could indicate the presence of a flavor symmetry at high energies. In general, the search for these correlations using low-energy data requires an estimate of leading-log radiative corrections. We present a complete analysis of the evolution between the electroweak and the grand unification scales of quark mass parameters in minimal supersymmetric models. We take $M_t=180$ GeV and consider all possible values of $\tan \beta$. We also analize the possibility that the {\it top} and/or the {\it bottom} Yukawa couplings result from an intermediate quasifixed point (QFP) of the equations. We show that the quark mixings of the third family do {\it not} have a QFP behaviour (in contrast to the masses, the renormalization of all the mixings is linear), and we evaluate the low-energy value of $V_{ub}$ which corresponds to $V_{ub}(M_X)=0$. Then we focus on the renormalization-group corrections to {\it (i)} typical relations obtained in models with flavor symmetries at the unification scale and {\it (ii)} a superstring-motivated pattern of quark mass matrices. We show that in most of the models the numerical prediction for $V_{ub}$ can be {\it corrected} in both directions (by varying $\tan\beta$) due to {\it top} or {\it bottom} radiative corrections. |
hep-ph/9310340 | Kingman | Kingman Cheung | Possibility of Studying Electroweak Symmetry Breaking at \gamma \gamma
Colliders | LaTex (Revtex v.2), 14 pages, 1 figure not inlcuded | Phys.Lett. B323 (1994) 85-89 | 10.1016/0370-2693(94)00046-8 | NUHEP-TH-93-27 | hep-ph | null | The studies of the electroweak symmetry breaking sector (EWSBS) at
$\gamma\gamma$ colliders were considered previously in the loop processes of
$\gamma\gamma \to w_Lw_L,\,z_Lz_L$, but they are suffered from the huge $W_T
W_T$ and $Z_TZ_T$ backgrounds. Here we present another possible process that
involves spectator $W$'s and $W_L$'s, the latter of which are scattered
strongly by the interactions of the EWSBS. We also show that this process
should be safe from the transverse backgrounds and it can probe the structure
of the EWSBS.
| [
{
"created": "Fri, 22 Oct 1993 19:14:39 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Cheung",
"Kingman",
""
]
] | The studies of the electroweak symmetry breaking sector (EWSBS) at $\gamma\gamma$ colliders were considered previously in the loop processes of $\gamma\gamma \to w_Lw_L,\,z_Lz_L$, but they are suffered from the huge $W_T W_T$ and $Z_TZ_T$ backgrounds. Here we present another possible process that involves spectator $W$'s and $W_L$'s, the latter of which are scattered strongly by the interactions of the EWSBS. We also show that this process should be safe from the transverse backgrounds and it can probe the structure of the EWSBS. |
0808.1689 | Redamy Perez Ramos | Redamy Perez Ramos | Transverse momentum spectra of charged hadrons in jets at the Tevatron | Contributed to Hard Probes 2008, Illa da Toxa (Galicia, Spain). 6
pages and 6 figures submitted to EPJC | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The hadronic $\kt$-spectrum inside a high energy jet is determined including
corrections of relative magnitude $\cO{\sqrt{\alpha_s}}$ with respect to the
Modified Leading Logarithmic Approximation (MLLA), in the limiting spectrum
approximation (assuming an infrared cut-off $Q_0 =\lqcd$) and beyond
($Q_0\ne\lqcd$). The results in the limiting spectrum approximation are found
to be, after normalization, in impressive agreement with measurements by the
CDF collaboration. A new integral representation for the "hump-backed" plateau
is also reported.
| [
{
"created": "Tue, 12 Aug 2008 16:08:14 GMT",
"version": "v1"
}
] | 2008-08-13 | [
[
"Ramos",
"Redamy Perez",
""
]
] | The hadronic $\kt$-spectrum inside a high energy jet is determined including corrections of relative magnitude $\cO{\sqrt{\alpha_s}}$ with respect to the Modified Leading Logarithmic Approximation (MLLA), in the limiting spectrum approximation (assuming an infrared cut-off $Q_0 =\lqcd$) and beyond ($Q_0\ne\lqcd$). The results in the limiting spectrum approximation are found to be, after normalization, in impressive agreement with measurements by the CDF collaboration. A new integral representation for the "hump-backed" plateau is also reported. |
2312.06758 | Rebecca Leane | Carlos Blanco, Rebecca K. Leane | Search for Dark Matter Ionization on the Night Side of Jupiter with
Cassini | 7 pages, 2 figures. Comments welcome! | null | null | SLAC-PUB-17753 | hep-ph astro-ph.EP astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new search for dark matter using planetary atmospheres. We point
out that annihilating dark matter in planets can produce ionizing radiation,
which can lead to excess production of ionospheric $H_3^+$. We apply this
search strategy to the night side of Jupiter near the equator. The night side
has zero solar irradiation, and low latitudes are sufficiently far from
ionizing auroras, leading to an effectively background-free search. We use
Cassini data on ionospheric $H_3^+$ emission collected 3 hours either side of
Jovian midnight, during its flyby in 2000, and set novel constraints on the
dark matter-nucleon scattering cross section down to about $10^{-38}$ cm$^2$.
We also highlight that dark matter atmospheric ionization may be detected in
Jovian exoplanets using future high-precision measurements of planetary
spectra.
| [
{
"created": "Mon, 11 Dec 2023 19:00:01 GMT",
"version": "v1"
}
] | 2023-12-13 | [
[
"Blanco",
"Carlos",
""
],
[
"Leane",
"Rebecca K.",
""
]
] | We present a new search for dark matter using planetary atmospheres. We point out that annihilating dark matter in planets can produce ionizing radiation, which can lead to excess production of ionospheric $H_3^+$. We apply this search strategy to the night side of Jupiter near the equator. The night side has zero solar irradiation, and low latitudes are sufficiently far from ionizing auroras, leading to an effectively background-free search. We use Cassini data on ionospheric $H_3^+$ emission collected 3 hours either side of Jovian midnight, during its flyby in 2000, and set novel constraints on the dark matter-nucleon scattering cross section down to about $10^{-38}$ cm$^2$. We also highlight that dark matter atmospheric ionization may be detected in Jovian exoplanets using future high-precision measurements of planetary spectra. |
2209.03914 | Hua-Sheng Shao | A.H. Ajjath and Hua-Sheng Shao | N$^3$LO+N$^3$LL QCD improved Higgs pair cross sections | 40 pages, 6 figures, 2 tables. v2: journal version (minor corrections
wrt v1) | JHEP 02 (2023) 067 | 10.1007/JHEP02(2023)067 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We report a new calculation of the soft-gluon threshold resummation for the
Higgs boson pair production in the dominant production mode -- gluon-gluon
fusion -- up to the next-to-next-to-next-to-leading logarithmic (N$^3$LL)
accuracy. After matching N$^3$LL to the next-to-next-to-next-to-leading order
(N$^3$LO) QCD calculation in the infinite top quark mass approximation, we show
that the central values of the inclusive cross sections are quite stable with
respect to N$^3$LO, while the conventional renormalisation and factorisation
scale uncertainties are reduced by a factor of two, reaching to the subpercent
level. Our study further consolidates the good asymptotic perturbative
convergence. After combining with the full top-quark mass dependent
next-to-leading order QCD results, our most advanced predictions are presented
for both the inclusive total cross sections and the differential invariant mass
distributions of the Higgs pair.
| [
{
"created": "Thu, 8 Sep 2022 16:51:08 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Feb 2023 11:43:01 GMT",
"version": "v2"
}
] | 2023-02-13 | [
[
"Ajjath",
"A. H.",
""
],
[
"Shao",
"Hua-Sheng",
""
]
] | We report a new calculation of the soft-gluon threshold resummation for the Higgs boson pair production in the dominant production mode -- gluon-gluon fusion -- up to the next-to-next-to-next-to-leading logarithmic (N$^3$LL) accuracy. After matching N$^3$LL to the next-to-next-to-next-to-leading order (N$^3$LO) QCD calculation in the infinite top quark mass approximation, we show that the central values of the inclusive cross sections are quite stable with respect to N$^3$LO, while the conventional renormalisation and factorisation scale uncertainties are reduced by a factor of two, reaching to the subpercent level. Our study further consolidates the good asymptotic perturbative convergence. After combining with the full top-quark mass dependent next-to-leading order QCD results, our most advanced predictions are presented for both the inclusive total cross sections and the differential invariant mass distributions of the Higgs pair. |
hep-ph/9309298 | null | A. Djouadi and P. Gambino | Electroweak gauge bosons self--energies: complete QCD corrections | 21 pages + 2 figures (available upon request), standard Latex,
Preprints UdeM-LPN-TH-93-169 and NYU--TH--93/09/04 | Phys.Rev.D49:3499-3511,1994; Erratum-ibid.D53:4111,1996 | 10.1103/PhysRevD.49.3499 10.1103/PhysRevD.53.4111 | null | hep-ph | null | We present the (two--loop) QCD corrections to the longitudinal and transverse
components of the electroweak gauge bosons self--energies for arbitrary
momentum transfer and for different internal quark masses. Compact formulae for
both the real and imaginary parts are given in the general case as well as in
some physically interesting special cases. The dependence on the definition of
the quark masses is discussed.
| [
{
"created": "Mon, 20 Sep 1993 21:50:13 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Djouadi",
"A.",
""
],
[
"Gambino",
"P.",
""
]
] | We present the (two--loop) QCD corrections to the longitudinal and transverse components of the electroweak gauge bosons self--energies for arbitrary momentum transfer and for different internal quark masses. Compact formulae for both the real and imaginary parts are given in the general case as well as in some physically interesting special cases. The dependence on the definition of the quark masses is discussed. |
hep-ph/9507446 | Alasdair James Gill | R.J. Rivers | Vortex Production at Phase Transitions in Nonrelativistic and
Relativistic Media | 23 pages, replaced version - tex problems corrected | null | null | Imperial/TP/94-95/47 | hep-ph | null | We examine string (vortex) formation at a quench for a weakly-coupled global
U(1) theory when the excitation spectrum is non-relativistic. It is so similar
to vortex production in the corresponding relativistic plasma as to reinforce
arguments for the similarity of vorheptex production in the early universe and
in low-temperature many-body physics.
| [
{
"created": "Fri, 28 Jul 1995 13:16:56 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Aug 1995 12:22:13 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Rivers",
"R. J.",
""
]
] | We examine string (vortex) formation at a quench for a weakly-coupled global U(1) theory when the excitation spectrum is non-relativistic. It is so similar to vortex production in the corresponding relativistic plasma as to reinforce arguments for the similarity of vorheptex production in the early universe and in low-temperature many-body physics. |
1404.0454 | Vannia Gonzalez Macias | J. Barranco, D. Delepine, V. Gonzalez Macias, L. Lopez-Lozano | Two Higgs doublet model and leptoquarks constraints from D meson decays | 10 pages, 5 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use a combined analysis of the semileptonic and leptonic branching ratios
of the D mesons to constrain scalar leptoquark interactions and charged
higgs-like interactions. For the THDM type II, we found that a low mass 6.3GeV
< m_{H^+} < 63.1GeV for the charged Higgs is favored at 90% C.L. although at
95% there is still agreement with other constraints. We find for the leptoquark
states a more restrictive bound than previous analysis.
| [
{
"created": "Wed, 2 Apr 2014 04:23:04 GMT",
"version": "v1"
}
] | 2014-04-03 | [
[
"Barranco",
"J.",
""
],
[
"Delepine",
"D.",
""
],
[
"Macias",
"V. Gonzalez",
""
],
[
"Lopez-Lozano",
"L.",
""
]
] | We use a combined analysis of the semileptonic and leptonic branching ratios of the D mesons to constrain scalar leptoquark interactions and charged higgs-like interactions. For the THDM type II, we found that a low mass 6.3GeV < m_{H^+} < 63.1GeV for the charged Higgs is favored at 90% C.L. although at 95% there is still agreement with other constraints. We find for the leptoquark states a more restrictive bound than previous analysis. |
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