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2211.10676 | Alexander Rothkopf | Alexander Rothkopf | Open-quantum-systems approach to in-medium heavy quarkonium dynamics | 6 pages, 3 figures, talk given at the 28th International Nuclear
Physics Conference (INPC 2022), Sep. 11-16, 2022, Cape Town, South Africa | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | Heavy quarkonium continues to play a central role in the study of nuclear
matter under extremes of temperature and density in relativistic heavy-ion
collisions. In this talk I report on recent developments in the theoretical
description of quarkonium in-medium dynamics using the open-quantum systems
approach. Not only does it provide a clear interpretation of the imaginary part
of the complex heavy-quark potential but also reveals that a subtle interplay
between screening and wavefunction decoherence is responsible for the melting
of heavy quarkonium states.
| [
{
"created": "Sat, 19 Nov 2022 12:00:36 GMT",
"version": "v1"
}
] | 2022-11-22 | [
[
"Rothkopf",
"Alexander",
""
]
] | Heavy quarkonium continues to play a central role in the study of nuclear matter under extremes of temperature and density in relativistic heavy-ion collisions. In this talk I report on recent developments in the theoretical description of quarkonium in-medium dynamics using the open-quantum systems approach. Not only does it provide a clear interpretation of the imaginary part of the complex heavy-quark potential but also reveals that a subtle interplay between screening and wavefunction decoherence is responsible for the melting of heavy quarkonium states. |
2007.10360 | Humberto Gilmer | Linda M. Carpenter, Humberto B. Gilmer, Junichiro Kawamura | New Bounds on Light Sneutrino Masses: Rare SUSY Signals | 21 pages, 9 figures | Phys. Rev. D 103, 095014 (2021) | 10.1103/PhysRevD.103.095014 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study bounds on a neutral component of weak doublet scalar lepton. A
typical example of such particle is sneutrinos in supersymmetric models. Using
constraints from invisible Higgs decays we place a lower bound of approximately
$m_h/2$. We recast a mono-$W/Z$ search, with hadronic vector boson tag in order
to bound parameter space in the sneutrino--charged slepton mass plane. We find
a lower bound on sneutrinos in the range of 55-100 GeV in the 36
$\text{fb}^{-1}$ data set depending on the mass of charged component. We
propose a sensitivity search in the hadronic mono-$W/Z$ channel for HL-LHC and
discuss both the discovery potential in case an excess is seen and exclusion
limit assuming no excess is seen.
| [
{
"created": "Mon, 20 Jul 2020 18:00:05 GMT",
"version": "v1"
},
{
"created": "Mon, 10 May 2021 18:56:52 GMT",
"version": "v2"
}
] | 2021-05-26 | [
[
"Carpenter",
"Linda M.",
""
],
[
"Gilmer",
"Humberto B.",
""
],
[
"Kawamura",
"Junichiro",
""
]
] | We study bounds on a neutral component of weak doublet scalar lepton. A typical example of such particle is sneutrinos in supersymmetric models. Using constraints from invisible Higgs decays we place a lower bound of approximately $m_h/2$. We recast a mono-$W/Z$ search, with hadronic vector boson tag in order to bound parameter space in the sneutrino--charged slepton mass plane. We find a lower bound on sneutrinos in the range of 55-100 GeV in the 36 $\text{fb}^{-1}$ data set depending on the mass of charged component. We propose a sensitivity search in the hadronic mono-$W/Z$ channel for HL-LHC and discuss both the discovery potential in case an excess is seen and exclusion limit assuming no excess is seen. |
hep-ph/9509357 | Boris Kopeliovich | B.Z. Kopeliovich (MPI-K, Heidelberg), J. Nemchik (INFN, Torino) | Color Transparency or the Standard Inelastic Shadowing? | 8 pages, latex file and 5 figures uuencoded in one file | Phys.Lett.B368:187-189,1996 | 10.1016/0370-2693(95)01525-6 | DFTT 56/95 | hep-ph | null | The standard first-order inelastic correction (IC) well known in the pre-QCD
era, causes a rising $Q^2$-dependence of nuclear transparency in the
quasielastic electron scattering, $A(e,e'p)A'$, at moderate $Q^2$, similar to
what is supposed to be the onset of color transparency (CT). Although IC is a
part of the whole pattern of CT, it contains no explicit QCD dynamics.
Evaluation of this correction is based on experimental data on diffraction
dissociation and is independent of whether CP phenomenon exists or not. The
growth of nuclear transparency is numerically comparable with the expected
signal of CT up to about $Q^2\approx 20\ GeV^2$. Analogous effect in
$A(p,2p)A'$ reaction is estimated as well.
| [
{
"created": "Fri, 22 Sep 1995 07:27:02 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Kopeliovich",
"B. Z.",
"",
"MPI-K, Heidelberg"
],
[
"Nemchik",
"J.",
"",
"INFN, Torino"
]
] | The standard first-order inelastic correction (IC) well known in the pre-QCD era, causes a rising $Q^2$-dependence of nuclear transparency in the quasielastic electron scattering, $A(e,e'p)A'$, at moderate $Q^2$, similar to what is supposed to be the onset of color transparency (CT). Although IC is a part of the whole pattern of CT, it contains no explicit QCD dynamics. Evaluation of this correction is based on experimental data on diffraction dissociation and is independent of whether CP phenomenon exists or not. The growth of nuclear transparency is numerically comparable with the expected signal of CT up to about $Q^2\approx 20\ GeV^2$. Analogous effect in $A(p,2p)A'$ reaction is estimated as well. |
hep-ph/0505082 | Mustapha Mekhfi | M.Mekhfi | Magnetic moment versus tensor charge | 15 pages pdf format | null | null | null | hep-ph | null | We express the baryon magnetic moments in terms of the baryon tensor charges,
considering the quarks as relativistic interacting objects. Once tensor charges
get measured accurately, the formula for the baryon magnetic moment will serve
to extract precise information on the quark anomalous magnetic moment, the
quark effective mass and the ratio of the quark constituent mass to the quark
effective mass. The analogous formula for the baryon electric dipole moment is
of no great use as it gets eventually sizable contributions from various CP-
violating sources not necessary associated to the quark electric dipole moment.
| [
{
"created": "Tue, 10 May 2005 19:32:04 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mekhfi",
"M.",
""
]
] | We express the baryon magnetic moments in terms of the baryon tensor charges, considering the quarks as relativistic interacting objects. Once tensor charges get measured accurately, the formula for the baryon magnetic moment will serve to extract precise information on the quark anomalous magnetic moment, the quark effective mass and the ratio of the quark constituent mass to the quark effective mass. The analogous formula for the baryon electric dipole moment is of no great use as it gets eventually sizable contributions from various CP- violating sources not necessary associated to the quark electric dipole moment. |
2102.08519 | Ryo Nagai | Ryo Nagai, Masaharu Tanabashi, Koji Tsumura, Yoshiki Uchida | Scalar and fermion on-shell amplitudes in generalized Higgs effective
field theory | 34 pages, 5 figures, version accepted for publication in PRD, typos
corrected | Phys. Rev. D 104, 015001 (2021) | 10.1103/PhysRevD.104.015001 | KYUSHU-HET-221 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Beyond standard model (BSM) particles should be included in effective field
theory in order to compute the scattering amplitudes involving these extra
particles. We formulate an extension of Higgs effective field theory which
contains arbitrary number of scalar and fermion fields with arbitrary electric
and chromoelectric charges. The BSM Higgs sector is described by using the
non-linear sigma model in a manner consistent with the spontaneous electroweak
symmetry breaking. The chiral order counting rule is arranged consistently with
the loop expansion. The leading order Lagrangian is organized in accord with
the chiral order counting rule. We use a geometrical language to describe the
particle interactions. The parametrization redundancy in the effective
Lagrangian is resolved by describing the on-shell scattering amplitudes only
with the covariant quantities in the scalar/fermion field space. We introduce a
useful coordinate (normal coordinate), which simplifies the computations of the
on-shell amplitudes significantly. We show the high energy behaviors of the
scattering amplitudes determine the "curvature tensors" in the scalar/fermion
field space. The massive spinor-wavefunction formalism is shown to be useful in
the computations of on-shell helicity amplitudes.
| [
{
"created": "Wed, 17 Feb 2021 01:00:25 GMT",
"version": "v1"
},
{
"created": "Tue, 11 May 2021 00:48:25 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Jun 2021 05:44:35 GMT",
"version": "v3"
}
] | 2021-07-07 | [
[
"Nagai",
"Ryo",
""
],
[
"Tanabashi",
"Masaharu",
""
],
[
"Tsumura",
"Koji",
""
],
[
"Uchida",
"Yoshiki",
""
]
] | Beyond standard model (BSM) particles should be included in effective field theory in order to compute the scattering amplitudes involving these extra particles. We formulate an extension of Higgs effective field theory which contains arbitrary number of scalar and fermion fields with arbitrary electric and chromoelectric charges. The BSM Higgs sector is described by using the non-linear sigma model in a manner consistent with the spontaneous electroweak symmetry breaking. The chiral order counting rule is arranged consistently with the loop expansion. The leading order Lagrangian is organized in accord with the chiral order counting rule. We use a geometrical language to describe the particle interactions. The parametrization redundancy in the effective Lagrangian is resolved by describing the on-shell scattering amplitudes only with the covariant quantities in the scalar/fermion field space. We introduce a useful coordinate (normal coordinate), which simplifies the computations of the on-shell amplitudes significantly. We show the high energy behaviors of the scattering amplitudes determine the "curvature tensors" in the scalar/fermion field space. The massive spinor-wavefunction formalism is shown to be useful in the computations of on-shell helicity amplitudes. |
0808.3696 | Jeppe R. Andersen | Jeppe R. Andersen (CERN), Vittorio Del Duca (Frascati), Chris D. White
(NIKHEF, Amsterdam) | Higgs Boson Production in Association with Multiple Hard Jets | 39 pages, v2: 43 pages, extended sections comparing to fixed order
results | JHEP 0902:015,2009 | 10.1088/1126-6708/2009/02/015 | CERN-PH-TH/2008-178, NIKHEF-2008-010 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We elucidate a new technique for estimating the production of multiple (at
least two) hard jets in Higgs production via gluon-gluon fusion. The approach
is based upon high energy factorisation, with the region of applicability
extended by constraints on the analytic behaviour of the scattering amplitudes
stemming from known all-order results. The method approximates both real and
virtual corrections, and allows for the resummation in an n-parton inclusive
event sample of the terms dominant in the high energy limit. The resulting
approximation is matched to the known tree level matrix elements for the
production of a Higgs boson in association with 2 and 3 jets, and implemented
in a Monte Carlo generator. Example results are presented and characteristic
radiation patterns discussed.
| [
{
"created": "Wed, 27 Aug 2008 13:03:09 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Jan 2009 16:50:38 GMT",
"version": "v2"
}
] | 2009-02-09 | [
[
"Andersen",
"Jeppe R.",
"",
"CERN"
],
[
"Del Duca",
"Vittorio",
"",
"Frascati"
],
[
"White",
"Chris D.",
"",
"NIKHEF, Amsterdam"
]
] | We elucidate a new technique for estimating the production of multiple (at least two) hard jets in Higgs production via gluon-gluon fusion. The approach is based upon high energy factorisation, with the region of applicability extended by constraints on the analytic behaviour of the scattering amplitudes stemming from known all-order results. The method approximates both real and virtual corrections, and allows for the resummation in an n-parton inclusive event sample of the terms dominant in the high energy limit. The resulting approximation is matched to the known tree level matrix elements for the production of a Higgs boson in association with 2 and 3 jets, and implemented in a Monte Carlo generator. Example results are presented and characteristic radiation patterns discussed. |
hep-ph/9705377 | Per Osland | P. Osland (Bergen) and A. A. Pankov (Gomel) | Optimal observables for new-physics search at LEP2 | LaTeX2e + 7 eps figures. References added, version to appear in Phys.
Lett. B | Phys.Lett. B406 (1997) 328-336 | 10.1016/S0370-2693(97)00682-5 | University of Bergen, Scientific/Technical Report No.1997-06 | hep-ph | null | New observables \sigma_\pm for the process e^+e^-\to\mu^+\mu^- allow one to
get more direct information on additional Z' boson effects than what is
obtained from the canonical ones, \sigma and A_{FB}. Their deviations from the
Standard Model predictions have very specific energy dependences, which are
precisely determined by SM parameters. At energies varying from TRISTAN to
LEP2, one can uniquely predict the signs of \Delta\sigma_{\pm} induced by a Z'
as well as the locations of their extrema and zeros. This unambiguous energy
correlation could be quite useful in distinguishing effects due to Z' exchange
from those caused by other new physics sources. Furthermore, there are two
energy points, \sqrt{s_{+}}\simeq 78 GeV and \sqrt{s_{-}}\simeq 113 GeV, where
the SM quantities \sigma_\pm^{SM} as well as the deviations \Delta\sigma_{\pm}
attain their minimum values or vanish. These points could be very favourable
for a search for new physics beyond the SM and beyond Z' effects.
| [
{
"created": "Wed, 21 May 1997 14:40:13 GMT",
"version": "v1"
},
{
"created": "Sun, 1 Jun 1997 11:18:49 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Osland",
"P.",
"",
"Bergen"
],
[
"Pankov",
"A. A.",
"",
"Gomel"
]
] | New observables \sigma_\pm for the process e^+e^-\to\mu^+\mu^- allow one to get more direct information on additional Z' boson effects than what is obtained from the canonical ones, \sigma and A_{FB}. Their deviations from the Standard Model predictions have very specific energy dependences, which are precisely determined by SM parameters. At energies varying from TRISTAN to LEP2, one can uniquely predict the signs of \Delta\sigma_{\pm} induced by a Z' as well as the locations of their extrema and zeros. This unambiguous energy correlation could be quite useful in distinguishing effects due to Z' exchange from those caused by other new physics sources. Furthermore, there are two energy points, \sqrt{s_{+}}\simeq 78 GeV and \sqrt{s_{-}}\simeq 113 GeV, where the SM quantities \sigma_\pm^{SM} as well as the deviations \Delta\sigma_{\pm} attain their minimum values or vanish. These points could be very favourable for a search for new physics beyond the SM and beyond Z' effects. |
1709.08541 | Franz Herzog | K. G. Chetyrkin, G. Falcioni, F. Herzog, J.A.M. Vermaseren | Five-loop renormalisation of QCD in covariant gauges | 17 pages; FORM and Mathematica result files available with the
source; corrected minor typos, added references, journal ref, 1 remark, 1
note and 1 additional result file | JHEP 1710 (2017) 179 | 10.1007/JHEP10(2017)179 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the complete set of vertex, wave function and charge
renormalisation constants in QCD in a general simple gauge group and with the
complete dependence on the covariant gauge parameter $\xi$ in the minimal
subtraction scheme of conventional dimensional regularisation. Our results
confirm all already known results, which were obtained in the Feynman gauge,
and allow the extraction of other useful gauges such as the Landau gauge. We
use these results to extract the Landau gauge five-loop anomalous dimensions of
the composite operator $A^2$ as well as the Landau gauge scheme independent
gluon, ghost and fermion propagators at five loops.
| [
{
"created": "Mon, 25 Sep 2017 15:14:01 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jan 2018 14:00:21 GMT",
"version": "v2"
}
] | 2018-01-24 | [
[
"Chetyrkin",
"K. G.",
""
],
[
"Falcioni",
"G.",
""
],
[
"Herzog",
"F.",
""
],
[
"Vermaseren",
"J. A. M.",
""
]
] | We present the complete set of vertex, wave function and charge renormalisation constants in QCD in a general simple gauge group and with the complete dependence on the covariant gauge parameter $\xi$ in the minimal subtraction scheme of conventional dimensional regularisation. Our results confirm all already known results, which were obtained in the Feynman gauge, and allow the extraction of other useful gauges such as the Landau gauge. We use these results to extract the Landau gauge five-loop anomalous dimensions of the composite operator $A^2$ as well as the Landau gauge scheme independent gluon, ghost and fermion propagators at five loops. |
0910.2124 | Jong Soo Kim | Gudrun Hiller, Jong Soo Kim, Henning Sedello | Collider Signatures of Minimal Flavor Mixing from Stop Decay Length
Measurements | 8 pages, 9 figures; references and minor clarifications added | Phys.Rev.D80:115016,2009 | 10.1103/PhysRevD.80.115016 | DO-TH 09/10 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the prospects to extract supersymmetric couplings from a decay
length measurement at the LHC. Specifically, we exploit the opportunity of a
light and long-lived stop which is pair-produced through gluinos in association
with like-sign top quarks. Any observed finite value of the stop decay length
strongly supports models in which flavor is broken in a minimal way solely by
the Standard Model Yukawa couplings. We find that a 1 picosecond stop lifetime,
dominated by t~ -> c chi^0 decays, yields macroscopic transverse impact
parameters of about 180 microns. If the lightest neutralino is predominantly
higgsino or very close in mass to the light stop, the stop lifetime even
increases and allows to observe stop tracks and possibly secondary vertices
directly. Measuring squark flavor violation with the stop decay length works
also with a gravitino LSP if the neutralino is the NLSP. For this case,
opportunities from t~ -> c chi^0 -> c gamma G~ decays for very light gravitinos
with mass <= keV are pointed out.
| [
{
"created": "Mon, 12 Oct 2009 10:24:07 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Dec 2009 18:23:36 GMT",
"version": "v2"
}
] | 2010-01-07 | [
[
"Hiller",
"Gudrun",
""
],
[
"Kim",
"Jong Soo",
""
],
[
"Sedello",
"Henning",
""
]
] | We investigate the prospects to extract supersymmetric couplings from a decay length measurement at the LHC. Specifically, we exploit the opportunity of a light and long-lived stop which is pair-produced through gluinos in association with like-sign top quarks. Any observed finite value of the stop decay length strongly supports models in which flavor is broken in a minimal way solely by the Standard Model Yukawa couplings. We find that a 1 picosecond stop lifetime, dominated by t~ -> c chi^0 decays, yields macroscopic transverse impact parameters of about 180 microns. If the lightest neutralino is predominantly higgsino or very close in mass to the light stop, the stop lifetime even increases and allows to observe stop tracks and possibly secondary vertices directly. Measuring squark flavor violation with the stop decay length works also with a gravitino LSP if the neutralino is the NLSP. For this case, opportunities from t~ -> c chi^0 -> c gamma G~ decays for very light gravitinos with mass <= keV are pointed out. |
hep-ph/0702255 | Aiichi Iwazaki | Aiichi Iwazaki | Spontaneous Breakdown of U(1) symmetry in DLCQ without Zero Mode | 7 pages | Phys.Rev.D75:105009,2007 | 10.1103/PhysRevD.75.105009 | Nisho-07/1 | hep-ph | null | We show that the spontaneous breakdown of U(1) symmetry in a Higgs model can
be described in discretized light cone formulation even by neglecting zero
mode. We obtain correctly the energy of a ground state with the symmetry
breakdown. We also show explicitly the presence of a Goldstone mode and its
absence when the U(1) symmetry is gauged. In spite of obtaining the favorable
results, we lose a merit in the formulation without zero modes that a naive
Fock vacuum is the true ground state.
| [
{
"created": "Mon, 26 Feb 2007 06:11:10 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Iwazaki",
"Aiichi",
""
]
] | We show that the spontaneous breakdown of U(1) symmetry in a Higgs model can be described in discretized light cone formulation even by neglecting zero mode. We obtain correctly the energy of a ground state with the symmetry breakdown. We also show explicitly the presence of a Goldstone mode and its absence when the U(1) symmetry is gauged. In spite of obtaining the favorable results, we lose a merit in the formulation without zero modes that a naive Fock vacuum is the true ground state. |
1507.02673 | Jusak Tandean | Xiao-Gang He, Jusak Tandean, Ya-Juan Zheng | Higgs Decay $h\to\mu\tau$ with Minimal Flavor Violation | 15 pages, no figures, minor errors corrected, references added,
matches publication | JHEP 09 (2015) 093 | 10.1007/JHEP09(2015)093 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the tentative indication of flavor-violating Higgs boson decay
$h\to\mu\tau$ recently reported in the CMS experiment within the framework of
minimal flavor violation. Specifically, we adopt the standard model extended
with the seesaw mechanism involving right-handed neutrinos plus effective
dimension-six operators satisfying the minimal flavor violation principle in
the lepton sector. We find that it is possible to accommodate the CMS
$h\to\mu\tau$ signal interpretation provided that the right-handed neutrinos
couple to the Higgs boson in some nontrivial way. We take into account
empirical constraints from other lepton-flavor-violating processes and discuss
how future searches for the $\mu\to e\gamma$ decay and $\mu\to e$ conversion in
nuclei may further probe the lepton-flavor-violating Higgs couplings.
| [
{
"created": "Thu, 9 Jul 2015 19:52:52 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Sep 2015 18:04:47 GMT",
"version": "v2"
}
] | 2015-09-22 | [
[
"He",
"Xiao-Gang",
""
],
[
"Tandean",
"Jusak",
""
],
[
"Zheng",
"Ya-Juan",
""
]
] | We consider the tentative indication of flavor-violating Higgs boson decay $h\to\mu\tau$ recently reported in the CMS experiment within the framework of minimal flavor violation. Specifically, we adopt the standard model extended with the seesaw mechanism involving right-handed neutrinos plus effective dimension-six operators satisfying the minimal flavor violation principle in the lepton sector. We find that it is possible to accommodate the CMS $h\to\mu\tau$ signal interpretation provided that the right-handed neutrinos couple to the Higgs boson in some nontrivial way. We take into account empirical constraints from other lepton-flavor-violating processes and discuss how future searches for the $\mu\to e\gamma$ decay and $\mu\to e$ conversion in nuclei may further probe the lepton-flavor-violating Higgs couplings. |
1902.08148 | Savvas Zafeiropoulos | S. Zafeiropoulos, Ph. Boucaud, F. De Soto, J. Rodr\'iguez-Quintero, J.
Segovia | The strong running coupling from the gauge sector of Domain Wall lattice
QCD with physical quark masses | 6 pages, 3 figures, v2: references added | Phys. Rev. Lett. 122, 162002 (2019) | 10.1103/PhysRevLett.122.162002 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on the first computation of the strong running coupling at the
physical point (physical pion mass) from the ghost-gluon vertex, computed from
lattice simulations with three flavors of Domain Wall fermions. We find
$\alpha_{\overline{\rm MS}}(m_Z^2)=0.1172(11)$, in remarkably good agreement
with the world-wide average. Our computational bridge to this value is the
Taylor-scheme strong coupling, which has been revealed of great interest by
itself because it can be directly related to the quark-gluon interaction kernel
in continuum approaches to the QCD bound-state problem.
| [
{
"created": "Thu, 21 Feb 2019 17:19:31 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Feb 2019 15:49:24 GMT",
"version": "v2"
}
] | 2019-05-01 | [
[
"Zafeiropoulos",
"S.",
""
],
[
"Boucaud",
"Ph.",
""
],
[
"De Soto",
"F.",
""
],
[
"Rodríguez-Quintero",
"J.",
""
],
[
"Segovia",
"J.",
""
]
] | We report on the first computation of the strong running coupling at the physical point (physical pion mass) from the ghost-gluon vertex, computed from lattice simulations with three flavors of Domain Wall fermions. We find $\alpha_{\overline{\rm MS}}(m_Z^2)=0.1172(11)$, in remarkably good agreement with the world-wide average. Our computational bridge to this value is the Taylor-scheme strong coupling, which has been revealed of great interest by itself because it can be directly related to the quark-gluon interaction kernel in continuum approaches to the QCD bound-state problem. |
hep-ph/0308282 | Ernest Ma | Ernest Ma (UC Riverside) | Tripartite Neutrino Mass Matrix | 9 pages, no figure | Phys.Lett. B583 (2004) 157-162 | 10.1016/j.physletb.2004.01.006 | UCRHEP-T363 (August 2003) | hep-ph | null | The 3 X 3 Majorana neutrino mass matrix is written as a sum of 3 terms, i.e.
M_nu = M_A + M_B + M_C, where M_A is proportional to the identity matrix and
M_B and M_C are invariant under different Z_3 transformations. This M_nu is
very suitable for understanding atmospheric and solar neutrino oscillations,
with sin^2 (2 theta_atm) and tan^2 (theta_sol) fixed at 1 and 0.5 respectively,
in excellent agreement with present data. It has in fact been proposed before,
but only as an ansatz. This paper uncovers its underlying symmetry, thus
allowing a complete theory of leptons and quarks to be constructed.
| [
{
"created": "Wed, 27 Aug 2003 14:59:53 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Ma",
"Ernest",
"",
"UC Riverside"
]
] | The 3 X 3 Majorana neutrino mass matrix is written as a sum of 3 terms, i.e. M_nu = M_A + M_B + M_C, where M_A is proportional to the identity matrix and M_B and M_C are invariant under different Z_3 transformations. This M_nu is very suitable for understanding atmospheric and solar neutrino oscillations, with sin^2 (2 theta_atm) and tan^2 (theta_sol) fixed at 1 and 0.5 respectively, in excellent agreement with present data. It has in fact been proposed before, but only as an ansatz. This paper uncovers its underlying symmetry, thus allowing a complete theory of leptons and quarks to be constructed. |
hep-ph/9501246 | Ananda B. Santra | A. N. Kamal and A. B. Santra | Nonfactorization and the decays $D_s^+ \to \phi \pi^+, \phi \rho^+$ and
$\phi l^+ \nu_l$ | 15 pages, Latex, four figure (available on request); | Z.Phys. C71 (1996) 101-106 | 10.1007/s002880050152 | Alberta Thy-1-95; January,1995 | hep-ph | null | In six chosen scenarios for the $q^2$ dependence of the form factors involved
in $D_s^+ \rightarrow \phi $ transition, we have determined the allowed domain
of $x = A_2(0) / A_1(0)$ and $y = V(0)/A_1(0)$ from the experimentally measured
ratios $R_{sl} = \Gamma(D_s^+ \rightarrow \phi l^+ \nu_l)/\Gamma(D_s^+
\rightarrow \phi \pi^+)$ and $R_h = \Gamma(D_s^+ \rightarrow \phi
\rho^+)/\Gamma(D_s^+ \rightarrow \phi \pi^+)$ in a scheme that uses the $N_c
=3$ value of the phenomenological parameter $a_1$ and includes nonfactorized
contribution. We find that the experimentally measured values of $x$ and $y$
from semileptonic decays of $D_s^+$ favor solutions which have significant
nonfactorized contribution, and, in particular, $R_{sl}$ favors solutions in
scenarios where $A_1(q^2)$ is either flat or decreasing with $q^2$.
| [
{
"created": "Mon, 9 Jan 1995 17:45:13 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Kamal",
"A. N.",
""
],
[
"Santra",
"A. B.",
""
]
] | In six chosen scenarios for the $q^2$ dependence of the form factors involved in $D_s^+ \rightarrow \phi $ transition, we have determined the allowed domain of $x = A_2(0) / A_1(0)$ and $y = V(0)/A_1(0)$ from the experimentally measured ratios $R_{sl} = \Gamma(D_s^+ \rightarrow \phi l^+ \nu_l)/\Gamma(D_s^+ \rightarrow \phi \pi^+)$ and $R_h = \Gamma(D_s^+ \rightarrow \phi \rho^+)/\Gamma(D_s^+ \rightarrow \phi \pi^+)$ in a scheme that uses the $N_c =3$ value of the phenomenological parameter $a_1$ and includes nonfactorized contribution. We find that the experimentally measured values of $x$ and $y$ from semileptonic decays of $D_s^+$ favor solutions which have significant nonfactorized contribution, and, in particular, $R_{sl}$ favors solutions in scenarios where $A_1(q^2)$ is either flat or decreasing with $q^2$. |
hep-ph/0105174 | Stefan Schaefer | S. Schaefer, A. Sch\"afer, M. Stratmann | Impact of Higher Order and Soft Gluon Corrections on the Extraction of
Higher Twist Effects in DIS | 16 pages, 3 figures | Phys.Lett. B514 (2001) 284-292 | 10.1016/S0370-2693(01)00809-7 | null | hep-ph | null | The impact of recently calculated next-to-next-to-leading order QCD
corrections and soft gluon resummations on the extraction of higher twist
contributions to the deep-inelastic structure function F_2 is studied using the
BCDMS and SLAC data. It is demonstrated to which extent the need for higher
twist terms is diminishing due to these higher order effects in the kinematical
region, 0.35 \le x \le 0.85 and Q^2>1.2 GeV^2, investigated. In addition,
theoretical uncertainties in the extraction of higher twist contributions are
discussed, and comparisons to results obtained previously are made.
| [
{
"created": "Thu, 17 May 2001 13:22:07 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Schaefer",
"S.",
""
],
[
"Schäfer",
"A.",
""
],
[
"Stratmann",
"M.",
""
]
] | The impact of recently calculated next-to-next-to-leading order QCD corrections and soft gluon resummations on the extraction of higher twist contributions to the deep-inelastic structure function F_2 is studied using the BCDMS and SLAC data. It is demonstrated to which extent the need for higher twist terms is diminishing due to these higher order effects in the kinematical region, 0.35 \le x \le 0.85 and Q^2>1.2 GeV^2, investigated. In addition, theoretical uncertainties in the extraction of higher twist contributions are discussed, and comparisons to results obtained previously are made. |
hep-ph/0012362 | J. Smit | M. Salle, J. Smit and J.C. Vink | Staying Thermal with Hartree Ensemble Approximations | 19 pages latex; extensively rewritten to improve presentation, data
essentially unchanged, analysis sharpened and one table added | Nucl.Phys. B625 (2002) 495-511 | 10.1016/S0550-3213(01)00659-9 | null | hep-ph hep-lat | null | We study thermal behavior of a recently introduced Hartree ensemble
approximation, which allows for non-perturbative inhomogeneous field
configurations as well as for approximate thermalization, in the $\phi^4$ model
in 1+1 dimensions. Using ensembles with a free field thermal distribution as
out-of-equilibrium initial conditions we determine thermalization time scales.
The time scale for which the system stays in approximate quantum thermal
equilibrium is an indication of the time scales for which the approximation
method stays reasonable. This time scale turns out to be two orders of
magnitude larger than the time scale for thermalization, in the range of
couplings and temperatures studied. We also discuss simplifications of our
method which are numerically more efficient and make a comparison with
classical dynamics.
| [
{
"created": "Thu, 28 Dec 2000 16:18:12 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Aug 2001 17:16:53 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Salle",
"M.",
""
],
[
"Smit",
"J.",
""
],
[
"Vink",
"J. C.",
""
]
] | We study thermal behavior of a recently introduced Hartree ensemble approximation, which allows for non-perturbative inhomogeneous field configurations as well as for approximate thermalization, in the $\phi^4$ model in 1+1 dimensions. Using ensembles with a free field thermal distribution as out-of-equilibrium initial conditions we determine thermalization time scales. The time scale for which the system stays in approximate quantum thermal equilibrium is an indication of the time scales for which the approximation method stays reasonable. This time scale turns out to be two orders of magnitude larger than the time scale for thermalization, in the range of couplings and temperatures studied. We also discuss simplifications of our method which are numerically more efficient and make a comparison with classical dynamics. |
2203.07256 | Andrea Wulzer Dr | Chiara Aim\`e, Aram Apyan, Mohammed Attia Mahmoud, Nazar Bartosik,
Alessandro Bertolin, Maurizio Bonesini, Salvatore Bottaro, Dario Buttazzo,
Rodolfo Capdevilla, Massimo Casarsa, Luca Castelli, Maria Gabriella Catanesi,
Francesco Giovanni Celiberto, Alessandro Cerri, Cari Cesarotti, Grigorios
Chachamis, Siyu Chen, Yang-Ting Chien, Mauro Chiesa, Gianmaria Collazuol,
Marco Costa, Nathaniel Craig, David Curtin, Sridhara Dasu, Jorge De Blas,
Dmitri Denisov, Haluk Denizli, Radovan Dermisek, Luca Di Luzio, Biagio Di
Micco, Keith Dienes, Tommaso Dorigo, Anna Ferrari, Davide Fiorina, Roberto
Franceschini, Francesco Garosi, Alfredo Glioti, Mario Greco, Admir Greljo,
Ramona Groeber, Christophe Grojean, Jiayin Gu, Tao Han, Brian Henning, Keith
Hermanek, Tova Ray Holmes, Samuel Homiller, Sudip Jana, Sergo Jindariani,
Yonatan Kahn, Ivan Karpov, Wolfgang Kilian, Kyoungchul Kong, Patrick
Koppenburg, Karol Krizka, Lawrence Lee, Qiang Li, Ronald Lipton, Zhen Liu,
Kenneth Long, Ian Low, Donatella Lucchesi, Yang Ma, Lianliang Ma, Fabio
Maltoni, Bruno Mansoulie, Luca Mantani, David Marzocca, Navin McGinnis,
Barbara Mele, Federico Meloni, Claudia Merlassino, Alessandro Montella, Marco
Nardecchia, Federico Nardi, Paolo Panci, Simone Pagan Griso, Giuliano Panico,
Rocco Paparella, Paride Paradisi, Nadia Pastrone, Fulvio Piccinini, Karolos
Potamianos, Emilio Radicioni, Riccardo Rattazzi, Diego Redigolo, Laura Reina,
J\"urgen Reuter, Cristina Riccardi, Lorenzo Ricci, Ursula van Rienen, Luciano
Ristori, Tania Natalie Robens, Richard Ruiz, Filippo Sala, Jakub Salko, Paola
Salvini, Ennio Salvioni, Daniel Schulte, Michele Selvaggi, Abdulkadir Senol,
Lorenzo Sestini, Varun Sharma, Jing Shu, Rosa Simoniello, Giordon Holtsberg
Stark, Daniel Stolarski, Shufang Su, Wei Su, Olcyr Sumensari, Xiaohu Sun,
Raman Sundrum, Jian Tang, Andrea Tesi, Brooks Thomas, Riccardo Torre,
Sokratis Trifinopoulos, Ilaria Vai, Alessandro Valenti, Ludovico Vittorio,
Liantao Wang, Yongcheng Wu, Andrea Wulzer, Xiaoran Zhao, Jose Zurita | Muon Collider Physics Summary | 21 pages, 7 figures; Contribution to Snowmass 2021 | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The perspective of designing muon colliders with high energy and luminosity,
which is being investigated by the International Muon Collider Collaboration,
has triggered a growing interest in their physics reach. We present a concise
summary of the muon colliders potential to explore new physics, leveraging on
the unique possibility of combining high available energy with very precise
measurements.
| [
{
"created": "Mon, 14 Mar 2022 16:39:32 GMT",
"version": "v1"
},
{
"created": "Fri, 27 May 2022 14:00:53 GMT",
"version": "v2"
}
] | 2022-05-30 | [
[
"Aimè",
"Chiara",
""
],
[
"Apyan",
"Aram",
""
],
[
"Mahmoud",
"Mohammed Attia",
""
],
[
"Bartosik",
"Nazar",
""
],
[
"Bertolin",
"Alessandro",
""
],
[
"Bonesini",
"Maurizio",
""
],
[
"Bottaro",
"Salvatore",
""
],
[
"Buttazzo",
"Dario",
""
],
[
"Capdevilla",
"Rodolfo",
""
],
[
"Casarsa",
"Massimo",
""
],
[
"Castelli",
"Luca",
""
],
[
"Catanesi",
"Maria Gabriella",
""
],
[
"Celiberto",
"Francesco Giovanni",
""
],
[
"Cerri",
"Alessandro",
""
],
[
"Cesarotti",
"Cari",
""
],
[
"Chachamis",
"Grigorios",
""
],
[
"Chen",
"Siyu",
""
],
[
"Chien",
"Yang-Ting",
""
],
[
"Chiesa",
"Mauro",
""
],
[
"Collazuol",
"Gianmaria",
""
],
[
"Costa",
"Marco",
""
],
[
"Craig",
"Nathaniel",
""
],
[
"Curtin",
"David",
""
],
[
"Dasu",
"Sridhara",
""
],
[
"De Blas",
"Jorge",
""
],
[
"Denisov",
"Dmitri",
""
],
[
"Denizli",
"Haluk",
""
],
[
"Dermisek",
"Radovan",
""
],
[
"Di Luzio",
"Luca",
""
],
[
"Di Micco",
"Biagio",
""
],
[
"Dienes",
"Keith",
""
],
[
"Dorigo",
"Tommaso",
""
],
[
"Ferrari",
"Anna",
""
],
[
"Fiorina",
"Davide",
""
],
[
"Franceschini",
"Roberto",
""
],
[
"Garosi",
"Francesco",
""
],
[
"Glioti",
"Alfredo",
""
],
[
"Greco",
"Mario",
""
],
[
"Greljo",
"Admir",
""
],
[
"Groeber",
"Ramona",
""
],
[
"Grojean",
"Christophe",
""
],
[
"Gu",
"Jiayin",
""
],
[
"Han",
"Tao",
""
],
[
"Henning",
"Brian",
""
],
[
"Hermanek",
"Keith",
""
],
[
"Holmes",
"Tova Ray",
""
],
[
"Homiller",
"Samuel",
""
],
[
"Jana",
"Sudip",
""
],
[
"Jindariani",
"Sergo",
""
],
[
"Kahn",
"Yonatan",
""
],
[
"Karpov",
"Ivan",
""
],
[
"Kilian",
"Wolfgang",
""
],
[
"Kong",
"Kyoungchul",
""
],
[
"Koppenburg",
"Patrick",
""
],
[
"Krizka",
"Karol",
""
],
[
"Lee",
"Lawrence",
""
],
[
"Li",
"Qiang",
""
],
[
"Lipton",
"Ronald",
""
],
[
"Liu",
"Zhen",
""
],
[
"Long",
"Kenneth",
""
],
[
"Low",
"Ian",
""
],
[
"Lucchesi",
"Donatella",
""
],
[
"Ma",
"Yang",
""
],
[
"Ma",
"Lianliang",
""
],
[
"Maltoni",
"Fabio",
""
],
[
"Mansoulie",
"Bruno",
""
],
[
"Mantani",
"Luca",
""
],
[
"Marzocca",
"David",
""
],
[
"McGinnis",
"Navin",
""
],
[
"Mele",
"Barbara",
""
],
[
"Meloni",
"Federico",
""
],
[
"Merlassino",
"Claudia",
""
],
[
"Montella",
"Alessandro",
""
],
[
"Nardecchia",
"Marco",
""
],
[
"Nardi",
"Federico",
""
],
[
"Panci",
"Paolo",
""
],
[
"Griso",
"Simone Pagan",
""
],
[
"Panico",
"Giuliano",
""
],
[
"Paparella",
"Rocco",
""
],
[
"Paradisi",
"Paride",
""
],
[
"Pastrone",
"Nadia",
""
],
[
"Piccinini",
"Fulvio",
""
],
[
"Potamianos",
"Karolos",
""
],
[
"Radicioni",
"Emilio",
""
],
[
"Rattazzi",
"Riccardo",
""
],
[
"Redigolo",
"Diego",
""
],
[
"Reina",
"Laura",
""
],
[
"Reuter",
"Jürgen",
""
],
[
"Riccardi",
"Cristina",
""
],
[
"Ricci",
"Lorenzo",
""
],
[
"van Rienen",
"Ursula",
""
],
[
"Ristori",
"Luciano",
""
],
[
"Robens",
"Tania Natalie",
""
],
[
"Ruiz",
"Richard",
""
],
[
"Sala",
"Filippo",
""
],
[
"Salko",
"Jakub",
""
],
[
"Salvini",
"Paola",
""
],
[
"Salvioni",
"Ennio",
""
],
[
"Schulte",
"Daniel",
""
],
[
"Selvaggi",
"Michele",
""
],
[
"Senol",
"Abdulkadir",
""
],
[
"Sestini",
"Lorenzo",
""
],
[
"Sharma",
"Varun",
""
],
[
"Shu",
"Jing",
""
],
[
"Simoniello",
"Rosa",
""
],
[
"Stark",
"Giordon Holtsberg",
""
],
[
"Stolarski",
"Daniel",
""
],
[
"Su",
"Shufang",
""
],
[
"Su",
"Wei",
""
],
[
"Sumensari",
"Olcyr",
""
],
[
"Sun",
"Xiaohu",
""
],
[
"Sundrum",
"Raman",
""
],
[
"Tang",
"Jian",
""
],
[
"Tesi",
"Andrea",
""
],
[
"Thomas",
"Brooks",
""
],
[
"Torre",
"Riccardo",
""
],
[
"Trifinopoulos",
"Sokratis",
""
],
[
"Vai",
"Ilaria",
""
],
[
"Valenti",
"Alessandro",
""
],
[
"Vittorio",
"Ludovico",
""
],
[
"Wang",
"Liantao",
""
],
[
"Wu",
"Yongcheng",
""
],
[
"Wulzer",
"Andrea",
""
],
[
"Zhao",
"Xiaoran",
""
],
[
"Zurita",
"Jose",
""
]
] | The perspective of designing muon colliders with high energy and luminosity, which is being investigated by the International Muon Collider Collaboration, has triggered a growing interest in their physics reach. We present a concise summary of the muon colliders potential to explore new physics, leveraging on the unique possibility of combining high available energy with very precise measurements. |
hep-ph/0509161 | Partha Konar | Partha Konar, Probir Roy | Event shape discrimination of supersymmetry from large extra dimensions
at a linear collider | LaTex 13 pages, 11 figures, 1 table. Some clarifications and
additions are made and also results for CLIC included | Phys.Lett. B634 (2006) 295-301 | 10.1016/j.physletb.2006.01.056 | TIFR/TH/05-35 | hep-ph | null | The production of a charged lepton (e/mu) pair with a large missing energy at
a linear collider is discussed as a means of distinguishing the minimal
supersymmetry (MSSM) scenario from that with large extra dimensions (ADD) for
parameter ranges where the total cross sections are comparable for both.
Analyses in terms of event shape variables, specifically sphericity and thrust,
are shown to enable a clear discrimination in this regard.
| [
{
"created": "Thu, 15 Sep 2005 16:58:04 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Jan 2006 14:01:48 GMT",
"version": "v2"
}
] | 2010-04-05 | [
[
"Konar",
"Partha",
""
],
[
"Roy",
"Probir",
""
]
] | The production of a charged lepton (e/mu) pair with a large missing energy at a linear collider is discussed as a means of distinguishing the minimal supersymmetry (MSSM) scenario from that with large extra dimensions (ADD) for parameter ranges where the total cross sections are comparable for both. Analyses in terms of event shape variables, specifically sphericity and thrust, are shown to enable a clear discrimination in this regard. |
1602.00298 | Boris Kopeliovich | B.Z. Kopeliovich | Gribov inelastic shadowing in the dipole representation | 17 pages, 9 figures. To be published in "Gribov-85 Memorial Volume",
World Scientific, 2016 | null | 10.1142/9789813141704_0021 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dipole phenomenology, which has been quite successful applied to various
hard reactions, especially on nuclear targets, is applied for calculation of
Gribov inelastic shadowing. This approach does not include ad hoc procedures,
which are unavoidable in calculations done in hadronic representation. Several
examples of Gribov corrections evaluated within the dipole description are
presented.
| [
{
"created": "Sun, 31 Jan 2016 18:44:00 GMT",
"version": "v1"
}
] | 2016-11-03 | [
[
"Kopeliovich",
"B. Z.",
""
]
] | The dipole phenomenology, which has been quite successful applied to various hard reactions, especially on nuclear targets, is applied for calculation of Gribov inelastic shadowing. This approach does not include ad hoc procedures, which are unavoidable in calculations done in hadronic representation. Several examples of Gribov corrections evaluated within the dipole description are presented. |
1102.3806 | Alice Valkarova | Radek \v{Z}leb\v{c}\'ik, Karel \v{C}ern\'y, Alice Valk\'arov\'a | Factorisation breaking in diffractive dijet photoproduction at HERA? | 7 pages, 5 figures | Eur.Phys.J.C71:1741,2011 | 10.1140/epjc/s10052-011-1741-z | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent experimental data on dijet cross sections in diffractive
photoproduction at HERA collider are analysed with an emphasis on QCD
factorisation breaking effects. The possible sources of the contradiction in
conclusions of H1 and ZEUS collaborations such as different hadronisation
corrections and different phase space of both analyses are studied.
| [
{
"created": "Fri, 18 Feb 2011 11:00:23 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Sep 2011 14:04:11 GMT",
"version": "v2"
}
] | 2011-09-30 | [
[
"Žlebčík",
"Radek",
""
],
[
"Černý",
"Karel",
""
],
[
"Valkárová",
"Alice",
""
]
] | Recent experimental data on dijet cross sections in diffractive photoproduction at HERA collider are analysed with an emphasis on QCD factorisation breaking effects. The possible sources of the contradiction in conclusions of H1 and ZEUS collaborations such as different hadronisation corrections and different phase space of both analyses are studied. |
1807.01169 | Ijaz Ahmed | Ijaz Ahmed, Nadia Kausar, Mahpara Ghazanfar | Possibility of observing charged Higgs in the single top production via
its $\tau$ lepton decay at LHC | We are not interested in this topic | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Single top quark production through weak interactions is considered to be an
important source of charged Higgs in the Minimal Super Symmetric Standard
Model. In the s-channel single top production having largest cross-section may
appear as a propagator in the form of heavy resonance state decaying to a pair
of top and bottom quark. The process under investigation is $pp \rightarrow
H^{\pm}\rightarrow tb \rightarrow b\bar{b}W^{\pm} \rightarrow
b\bar{b}\tau^{\pm} \nu_{\tau}$, where top quark exclusively decays into a pair
of bottom quark and W boson while W boson subsequently decays to $\tau$ jet and
neutrino. So the final state is characterized by the presence of two b jets,
hadronic $\tau$ decay and missing transverse energy. Within the presence of QCD
multijet and electroweak background events at LHC, it has been demonstrated
that the charged Higgs signal observability is possible within the available
MSSM parameter space (tan$\beta$, $m_{H^{\pm}})$ respecting all experimental
and theoretical constraints. In order to show the observability potential of
charged Higgs, the exclusion curves at 95$\%$ confidence level and 5$\sigma$
contours are plotted at different integrated luminosities with $\sqrt{s}=$14
TeV.
| [
{
"created": "Sun, 1 Jul 2018 22:42:58 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Jun 2022 09:42:24 GMT",
"version": "v2"
},
{
"created": "Sat, 11 Jun 2022 08:58:19 GMT",
"version": "v3"
}
] | 2022-06-14 | [
[
"Ahmed",
"Ijaz",
""
],
[
"Kausar",
"Nadia",
""
],
[
"Ghazanfar",
"Mahpara",
""
]
] | Single top quark production through weak interactions is considered to be an important source of charged Higgs in the Minimal Super Symmetric Standard Model. In the s-channel single top production having largest cross-section may appear as a propagator in the form of heavy resonance state decaying to a pair of top and bottom quark. The process under investigation is $pp \rightarrow H^{\pm}\rightarrow tb \rightarrow b\bar{b}W^{\pm} \rightarrow b\bar{b}\tau^{\pm} \nu_{\tau}$, where top quark exclusively decays into a pair of bottom quark and W boson while W boson subsequently decays to $\tau$ jet and neutrino. So the final state is characterized by the presence of two b jets, hadronic $\tau$ decay and missing transverse energy. Within the presence of QCD multijet and electroweak background events at LHC, it has been demonstrated that the charged Higgs signal observability is possible within the available MSSM parameter space (tan$\beta$, $m_{H^{\pm}})$ respecting all experimental and theoretical constraints. In order to show the observability potential of charged Higgs, the exclusion curves at 95$\%$ confidence level and 5$\sigma$ contours are plotted at different integrated luminosities with $\sqrt{s}=$14 TeV. |
1312.0044 | Ricardo Gaitan | R. Gait\'an, R. Martinez, J.H. Montes de Oca Y. and S. Rodriguez Romo | Rare top decay and CP violation in THDM | 8 pages, 5 figures | null | 10.1140/epjc/s10052-014-2788-4 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the formalism of two Higgs doublet model type III with CP
violation from CP-even CP-odd mixing in the neutral Higgs bosons. The flavor
changing interactions among neutral Higgs bosons and fermions are presented at
tree level in this type of model. These assumptions allow the study rare top
decays mediated by neutral Higgs bosons, particularly we are interested in
$t\rightarrow c l^+l^-$. For this process we estimated upper bounds of the
branching ratios $\textrm{Br}(t\rightarrow c \tau^+\tau^-)$ of the order of
$10^{-9}\sim 10^{-7}$ for a neutral Higgs boson mass of 125 GeV and
$\tan\beta=1$, 1.5, 2, 2.5. For the case of $t\rightarrow c \tau^+\tau^-$ the
number of possible events is estimated from 1 to 10 events which could be
observed in future experiments at LHC with a luminosity of 300
$\textrm{fb}^{-1}$ and 14 GeV for the energy of the center of mass. Also we
estimate that the number of events for the process $t\rightarrow c l^+l^-$ in
different scenarios is of order of $2500$.
| [
{
"created": "Sat, 30 Nov 2013 00:04:23 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Gaitán",
"R.",
""
],
[
"Martinez",
"R.",
""
],
[
"Y.",
"J. H. Montes de Oca",
""
],
[
"Romo",
"S. Rodriguez",
""
]
] | We discuss the formalism of two Higgs doublet model type III with CP violation from CP-even CP-odd mixing in the neutral Higgs bosons. The flavor changing interactions among neutral Higgs bosons and fermions are presented at tree level in this type of model. These assumptions allow the study rare top decays mediated by neutral Higgs bosons, particularly we are interested in $t\rightarrow c l^+l^-$. For this process we estimated upper bounds of the branching ratios $\textrm{Br}(t\rightarrow c \tau^+\tau^-)$ of the order of $10^{-9}\sim 10^{-7}$ for a neutral Higgs boson mass of 125 GeV and $\tan\beta=1$, 1.5, 2, 2.5. For the case of $t\rightarrow c \tau^+\tau^-$ the number of possible events is estimated from 1 to 10 events which could be observed in future experiments at LHC with a luminosity of 300 $\textrm{fb}^{-1}$ and 14 GeV for the energy of the center of mass. Also we estimate that the number of events for the process $t\rightarrow c l^+l^-$ in different scenarios is of order of $2500$. |
2101.02166 | Shankha Banerjee | Shankha Banerjee, Fawzi Boudjema, Nabarun Chakrabarty and Hao Sun | Relic density of dark matter in the inert doublet model beyond leading
order for the low mass region: 2. Co-annihilation | v1: 14 pages, 9 figures and 2 tables | Phys. Rev. D 104, 075003 (2021) | 10.1103/PhysRevD.104.075003 | LAPTH-002/21, CERN-TH-2021-002 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We examine the relic density of the light mass dark matter region in the
inert doublet model (IDM) when the dominant process is due to co-annihilation
between the lightest neutral scalars of the model. The full one-loop
electroweak corrections are computed in an on-shell scheme and are found to be
well approximated as an effective cross-section expressed in terms of
$Z$-observables. The electroweak corrections to the subdominant process which
consists of an annihilation into an on-shell $W$ and an off-shell $W$, that is
calculated as a annihilation into a 3-body final state, is also performed. The
latter reveals an important dependence on a parameter that describes the
self-interaction of the new scalars (solely within the dark sector), a
parameter which is not accessible in tree-level calculations of standard model
(SM)-IDM interactions.
| [
{
"created": "Wed, 6 Jan 2021 18:03:50 GMT",
"version": "v1"
}
] | 2021-10-13 | [
[
"Banerjee",
"Shankha",
""
],
[
"Boudjema",
"Fawzi",
""
],
[
"Chakrabarty",
"Nabarun",
""
],
[
"Sun",
"Hao",
""
]
] | We examine the relic density of the light mass dark matter region in the inert doublet model (IDM) when the dominant process is due to co-annihilation between the lightest neutral scalars of the model. The full one-loop electroweak corrections are computed in an on-shell scheme and are found to be well approximated as an effective cross-section expressed in terms of $Z$-observables. The electroweak corrections to the subdominant process which consists of an annihilation into an on-shell $W$ and an off-shell $W$, that is calculated as a annihilation into a 3-body final state, is also performed. The latter reveals an important dependence on a parameter that describes the self-interaction of the new scalars (solely within the dark sector), a parameter which is not accessible in tree-level calculations of standard model (SM)-IDM interactions. |
1704.00396 | Hai-Yang Cheng | Hai-Yang Cheng, Cheng-Wei Chiang | Quantum Numbers of $\Omega_c$ States and Other Charmed Baryons | 21 pages, 7 figures. Sec. II.A is substantially revised. Quantum
number assignment to Omega_c(3050) and Omega_c(3066) is modified. Two more
figures for the Regge trajectories in the (n_r, M^2) plane | Phys. Rev. D 95, 094018 (2017) | 10.1103/PhysRevD.95.094018 | NCTS-PH/1708 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Possible spin-parity quantum numbers for excited charmed baryon resonances
are discussed in this work. Our main results are: (i) Among the five newly
observed $\Omega_c$ states, we have identified $\Omega_c(3090)$ and
$\Omega_c(3119)$ with radially excited $\frac12^+(2S)$ and $\frac32^+(2S)$
states, respectively, and $\Omega_c(3000)$ with $\frac12^-(1P)$ and
$S=\frac32$. The two states $\Omega_c(3050)$ and $\Omega_c(3066)$ form a
$P$-wave $(\frac32^-,\frac52^-)$ doublet. (ii) The widths of $\Omega_c(3066)$
and $\Xi'_c(2930)$ are calculable within the framework of heavy hadron chiral
perturbation theory. (iii) Since the width of $\Omega_{c0}(\frac12^-)$ is of
order 410 MeV, not all observed narrow $\Omega_c$ baryons can be identified
with $1P$ states. (iv) For the antitriplet $\Lambda_c$ and $\Xi_c$ states,
their Regge trajectories for the orbital excitations of $\frac12^-$ and
$\frac32^-$ are parallel to each other. Based on this nice property of
parallelism, we see that the highest state $\Lambda_c(2940)$ does not fit if
its quantum numbers are $\frac32^-$ as found by LHCb. We suggest that
$\Lambda_c(2940)^+$ is most likely the $\frac12^-(2P)$ state. (v) The charmed
baryon $\Sigma_c(2800)$ cannot be a $\frac12^-$ state; otherwise, its width
will be over 400~MeV, too large compared to the measured one. (vi) In the study
of Regge trajectories of $\Xi'_c$ states, we find a missing state. It should
have quantum numbers $\frac52^-$ with a mass around 2920~MeV.
| [
{
"created": "Mon, 3 Apr 2017 01:06:45 GMT",
"version": "v1"
},
{
"created": "Tue, 2 May 2017 01:26:18 GMT",
"version": "v2"
}
] | 2017-05-31 | [
[
"Cheng",
"Hai-Yang",
""
],
[
"Chiang",
"Cheng-Wei",
""
]
] | Possible spin-parity quantum numbers for excited charmed baryon resonances are discussed in this work. Our main results are: (i) Among the five newly observed $\Omega_c$ states, we have identified $\Omega_c(3090)$ and $\Omega_c(3119)$ with radially excited $\frac12^+(2S)$ and $\frac32^+(2S)$ states, respectively, and $\Omega_c(3000)$ with $\frac12^-(1P)$ and $S=\frac32$. The two states $\Omega_c(3050)$ and $\Omega_c(3066)$ form a $P$-wave $(\frac32^-,\frac52^-)$ doublet. (ii) The widths of $\Omega_c(3066)$ and $\Xi'_c(2930)$ are calculable within the framework of heavy hadron chiral perturbation theory. (iii) Since the width of $\Omega_{c0}(\frac12^-)$ is of order 410 MeV, not all observed narrow $\Omega_c$ baryons can be identified with $1P$ states. (iv) For the antitriplet $\Lambda_c$ and $\Xi_c$ states, their Regge trajectories for the orbital excitations of $\frac12^-$ and $\frac32^-$ are parallel to each other. Based on this nice property of parallelism, we see that the highest state $\Lambda_c(2940)$ does not fit if its quantum numbers are $\frac32^-$ as found by LHCb. We suggest that $\Lambda_c(2940)^+$ is most likely the $\frac12^-(2P)$ state. (v) The charmed baryon $\Sigma_c(2800)$ cannot be a $\frac12^-$ state; otherwise, its width will be over 400~MeV, too large compared to the measured one. (vi) In the study of Regge trajectories of $\Xi'_c$ states, we find a missing state. It should have quantum numbers $\frac52^-$ with a mass around 2920~MeV. |
0903.1257 | Fritz W. Bopp | Fritz W. Bopp | Is a Rich Vacuum Structure Responsible for Fermion and Weak-Boson Masses | 18 pages, 6 Figures | null | null | SI-HEP-2009-05 | hep-ph astro-ph.CO gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An unconventional Cosmographical model for a generation of fermion and week
boson masses without electro-weak Higgs bosons is outlined. It is based on a
rich, non perturbative vacuum structure taken to be an object of qualitative
phenomenology. Numerous far reaching and astonishing consequences are
discussed.
| [
{
"created": "Fri, 6 Mar 2009 17:04:34 GMT",
"version": "v1"
}
] | 2009-03-21 | [
[
"Bopp",
"Fritz W.",
""
]
] | An unconventional Cosmographical model for a generation of fermion and week boson masses without electro-weak Higgs bosons is outlined. It is based on a rich, non perturbative vacuum structure taken to be an object of qualitative phenomenology. Numerous far reaching and astonishing consequences are discussed. |
0802.0276 | Leonid Glozman | L. Ya. Glozman and R. F. Wagenbrunn | Chirally symmetric but confined hadrons at finite density | 4 pp.; Contribution to proceedings of "Chiral 07", November 13-16,
2007, Osaka, Japan | Mod.Phys.Lett.A23:2385-2388,2008 | 10.1142/S0217732308029435 | null | hep-ph astro-ph hep-lat hep-th nucl-th | null | At a critical finite chemical potential and low temperature QCD undergoes the
chiral restoration phase transition. The folklore tradition is that
simultaneously hadrons are deconfined and there appears the quark matter. We
demonstrate that it is possible to have confined but chirally symmetric hadrons
at a finite chemical potential and hence beyond the chiral restoration point at
a finite chemical potential and low temperature there could exist a chirally
symmetric matter consisting of chirally symmetric but confined hadrons. If it
does happen in QCD, then the QCD phase diagram should be reconsidered with
obvious implications for heavy ion programs and astrophysics.
| [
{
"created": "Sun, 3 Feb 2008 17:46:07 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Glozman",
"L. Ya.",
""
],
[
"Wagenbrunn",
"R. F.",
""
]
] | At a critical finite chemical potential and low temperature QCD undergoes the chiral restoration phase transition. The folklore tradition is that simultaneously hadrons are deconfined and there appears the quark matter. We demonstrate that it is possible to have confined but chirally symmetric hadrons at a finite chemical potential and hence beyond the chiral restoration point at a finite chemical potential and low temperature there could exist a chirally symmetric matter consisting of chirally symmetric but confined hadrons. If it does happen in QCD, then the QCD phase diagram should be reconsidered with obvious implications for heavy ion programs and astrophysics. |
hep-ph/9709419 | Matthias Jamin | Markus Eidemueller, Matthias Jamin | QCD field strength correlator at the next-to-leading order | 11 pages, LaTeX, 3 eps figures | Phys.Lett. B416 (1998) 415-420 | 10.1016/S0370-2693(97)01352-X | HD-THEP-97-49 | hep-ph | null | The gauge invariant two-point correlation function of the gauge field
strength tensor is calculated in perturbation theory at the next-to-leading
order. Besides a direct calculation in perturbative QCD we also present a
derivation of the correlation function in the heavy quark effective theory. Our
results are briefly compared with recent determinations of the field strength
correlator on the lattice.
| [
{
"created": "Mon, 22 Sep 1997 15:37:21 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Eidemueller",
"Markus",
""
],
[
"Jamin",
"Matthias",
""
]
] | The gauge invariant two-point correlation function of the gauge field strength tensor is calculated in perturbation theory at the next-to-leading order. Besides a direct calculation in perturbative QCD we also present a derivation of the correlation function in the heavy quark effective theory. Our results are briefly compared with recent determinations of the field strength correlator on the lattice. |
hep-ph/0508086 | Qiang Zhao | Qiang Zhao | A coherent study of $\chi_{c0,2}\to VV$, $PP$ and $SS$ | Revtex, 8 pages, 3 figures; Typos corrected, version accepted by
Phys. Rev. D | Phys.Rev.D72:074001,2005 | 10.1103/PhysRevD.72.074001 | null | hep-ph hep-ex nucl-ex nucl-th | null | We investigate the decays of $\chi_{c0,2}$ into vector meson pairs ($VV$),
pseudoscalar pairs ($PP$), and scalar pairs ($SS$) in a general factorization
scheme. The purpose is to clarify the role played by the OZI-rule violations
and SU(3) flavour breakings in the decay transitions, and their correlations
with the final state meson wavefunctions. For $\chi_{c0,2}\to VV$ and $PP$, we
obtain an overall self-contained description of the experimental data. Applying
this factorization to $\chi_{c0}\to f_0^i f_0^j$, where $i, j=1, 2, 3$ denotes
$f_0(1710)$, $f_0(1500)$ and $f_0(1370)$, respectively, we find that specific
patterns will arise from the model predictions for the decay branching ratio
magnitudes, and useful information about the structure of those three scalars
can be abstracted.
| [
{
"created": "Sun, 7 Aug 2005 13:37:12 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Sep 2005 12:06:27 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Zhao",
"Qiang",
""
]
] | We investigate the decays of $\chi_{c0,2}$ into vector meson pairs ($VV$), pseudoscalar pairs ($PP$), and scalar pairs ($SS$) in a general factorization scheme. The purpose is to clarify the role played by the OZI-rule violations and SU(3) flavour breakings in the decay transitions, and their correlations with the final state meson wavefunctions. For $\chi_{c0,2}\to VV$ and $PP$, we obtain an overall self-contained description of the experimental data. Applying this factorization to $\chi_{c0}\to f_0^i f_0^j$, where $i, j=1, 2, 3$ denotes $f_0(1710)$, $f_0(1500)$ and $f_0(1370)$, respectively, we find that specific patterns will arise from the model predictions for the decay branching ratio magnitudes, and useful information about the structure of those three scalars can be abstracted. |
2207.05402 | Jiaxing Zhao | Wan Wu, Guojun Huang, Jiaxing Zhao, and Pengfei Zhuang | Heavy-quark potential in Gribov-Zwanziger approach around deconfinement
phase transition | 6 pages, 7 figures | null | null | null | hep-ph nucl-th | http://creativecommons.org/publicdomain/zero/1.0/ | The interaction potential between a pair of heavy quarks is calculated with
resummed perturbation method in Gribov-Zwanziger approach at finite
temperature. The resummed loop correction makes the potential complex. While
the real part is, as expected, screened and becomes short-ranged in hot medium,
the strength of the imaginary part increases with temperature and is comparable
with the real part, which is very different from the previous calculation in
HTL approach. This means that, both the color screening and Landau damping play
important role in the dissociation of heavy flavor hadrons in hot medium.
| [
{
"created": "Tue, 12 Jul 2022 09:06:59 GMT",
"version": "v1"
}
] | 2022-07-13 | [
[
"Wu",
"Wan",
""
],
[
"Huang",
"Guojun",
""
],
[
"Zhao",
"Jiaxing",
""
],
[
"Zhuang",
"Pengfei",
""
]
] | The interaction potential between a pair of heavy quarks is calculated with resummed perturbation method in Gribov-Zwanziger approach at finite temperature. The resummed loop correction makes the potential complex. While the real part is, as expected, screened and becomes short-ranged in hot medium, the strength of the imaginary part increases with temperature and is comparable with the real part, which is very different from the previous calculation in HTL approach. This means that, both the color screening and Landau damping play important role in the dissociation of heavy flavor hadrons in hot medium. |
0710.0988 | Mei Huang | Song He, Mei Huang, Qi-Shu Yan, Yi Yang | Confront Holographic QCD with Regge Trajectories of vectors and
axial-vectors | 9 pages, 3 figure and 3 tables, one section added | The European Physical Journal C volume 66, pages 187-196 (2010) | 10.1140/epjc/s10052-010-1239-0 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the general 5-dimension metric structure of the $Dp-Dq$ system in
type II superstring theory, and demonstrate the physical meaning of the
parameters characterizing the 5-dimension metric structure of the
\textit{holographic} QCD model by relating them to the parameters describing
Regge trajectories. By matching the spectra of vector mesons $\rho_1$ with
deformed $Dp-Dq$ soft-wall model, we find that the spectra of vector mesons
$\rho_1$ can be described very well in the soft-wall $D3-Dq$ model, i.e,
$AdS_5$ soft-wall model. We then investigate how well the $AdS_5$ soft-wall
model can describe the Regge trajectory of axial-vector mesons $a_1$. We find
that the constant component of the 5-dimension mass square of axial-vector
mesons plays an efficient role to realize the chiral symmetry breaking in the
vacuum, and a small negative $z^4$ correction in the 5-dimension mass square is
helpful to realize the chiral symmetry restoration in high excitation states.
| [
{
"created": "Thu, 4 Oct 2007 11:45:42 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Dec 2008 11:12:26 GMT",
"version": "v2"
}
] | 2023-01-03 | [
[
"He",
"Song",
""
],
[
"Huang",
"Mei",
""
],
[
"Yan",
"Qi-Shu",
""
],
[
"Yang",
"Yi",
""
]
] | We derive the general 5-dimension metric structure of the $Dp-Dq$ system in type II superstring theory, and demonstrate the physical meaning of the parameters characterizing the 5-dimension metric structure of the \textit{holographic} QCD model by relating them to the parameters describing Regge trajectories. By matching the spectra of vector mesons $\rho_1$ with deformed $Dp-Dq$ soft-wall model, we find that the spectra of vector mesons $\rho_1$ can be described very well in the soft-wall $D3-Dq$ model, i.e, $AdS_5$ soft-wall model. We then investigate how well the $AdS_5$ soft-wall model can describe the Regge trajectory of axial-vector mesons $a_1$. We find that the constant component of the 5-dimension mass square of axial-vector mesons plays an efficient role to realize the chiral symmetry breaking in the vacuum, and a small negative $z^4$ correction in the 5-dimension mass square is helpful to realize the chiral symmetry restoration in high excitation states. |
1705.10606 | Nestor Quintero | Jhovanny Mejia-Guisao, Diego Milanes, Nestor Quintero, and Jose D.
Ruiz-Alvarez | Exploring GeV-scale Majorana neutrinos in lepton-number-violating
$\Lambda_b^0$ baryon decays | 13 pages, 10 figures. v3: matches with version published in Phys.
Rev. D | Phys. Rev. D 96, 015039 (2017) | 10.1103/PhysRevD.96.015039 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, the lepton-number-violating processes in $|\Delta L|=2$ decays
of $\Lambda_b^0$ baryon, $\Lambda_b^0 \to p \pi^+\mu^- \mu^-$ and $\Lambda_b^0
\to \Lambda_c^+ \pi^+\mu^- \mu^-$, are investigated for the first time, via an
intermediate on-shell Majorana neutrino $N$ with a mass in the GeV scale. We
explore the experimental sensitivity of these dimuon channels at the LHCb and
CMS experiments, in which heavy neutrino lifetimes in the accessible ranges of
$\tau_N = [1, 100, 1000]$ ps are considered. For a integrated luminosity
collected of 10 and 50 fb${}^{-1}$ at the LHCb and 30, 300 and 3000 fb${}^{-1}$
at the CMS, we found significant sensitivity on branching fractions of the
order ${\rm BR}(\Lambda_b^0 \to p \pi^+\mu^- \mu^-) \lesssim
\mathcal{O}(10^{-9} - 10^{-8})$ and ${\rm BR}(\Lambda_b^0 \to \Lambda_c^+
\pi^+\mu^- \mu^-) \lesssim \mathcal{O}(10^{-8} - 10^{-7})$. Exclusion regions
on the parameter space ($m_N,|V_{\mu N}|^{2}$) associated with the heavy
neutrino are presented and compared with those from $K^- \to \pi^+\mu^-\mu^-$
(NA48/2) and $B^- \to \pi^+\mu^-\mu^-$ (LHCb) as well as by different search
strategies such as NA3, CHARMII, NuTeV, Belle, and DELPHI.
| [
{
"created": "Fri, 26 May 2017 22:46:21 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Jun 2017 21:34:55 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Aug 2017 14:00:25 GMT",
"version": "v3"
}
] | 2017-08-02 | [
[
"Mejia-Guisao",
"Jhovanny",
""
],
[
"Milanes",
"Diego",
""
],
[
"Quintero",
"Nestor",
""
],
[
"Ruiz-Alvarez",
"Jose D.",
""
]
] | In this work, the lepton-number-violating processes in $|\Delta L|=2$ decays of $\Lambda_b^0$ baryon, $\Lambda_b^0 \to p \pi^+\mu^- \mu^-$ and $\Lambda_b^0 \to \Lambda_c^+ \pi^+\mu^- \mu^-$, are investigated for the first time, via an intermediate on-shell Majorana neutrino $N$ with a mass in the GeV scale. We explore the experimental sensitivity of these dimuon channels at the LHCb and CMS experiments, in which heavy neutrino lifetimes in the accessible ranges of $\tau_N = [1, 100, 1000]$ ps are considered. For a integrated luminosity collected of 10 and 50 fb${}^{-1}$ at the LHCb and 30, 300 and 3000 fb${}^{-1}$ at the CMS, we found significant sensitivity on branching fractions of the order ${\rm BR}(\Lambda_b^0 \to p \pi^+\mu^- \mu^-) \lesssim \mathcal{O}(10^{-9} - 10^{-8})$ and ${\rm BR}(\Lambda_b^0 \to \Lambda_c^+ \pi^+\mu^- \mu^-) \lesssim \mathcal{O}(10^{-8} - 10^{-7})$. Exclusion regions on the parameter space ($m_N,|V_{\mu N}|^{2}$) associated with the heavy neutrino are presented and compared with those from $K^- \to \pi^+\mu^-\mu^-$ (NA48/2) and $B^- \to \pi^+\mu^-\mu^-$ (LHCb) as well as by different search strategies such as NA3, CHARMII, NuTeV, Belle, and DELPHI. |
hep-ph/9801316 | Tom Cohen | Thomas D. Cohen | Qunatum Number Exotic Mesons and Large N QCD | 5 pages | Phys.Lett. B427 (1998) 348-352 | 10.1016/S0370-2693(98)00364-5 | U. MD PP # 98-076; DOE/ER/40762-141 | hep-ph nucl-th | null | Exotic mesons with quantum numbers of a hybrid ($\bar{q} q g$) such as
$J^{PC} = 1^{-+}$are shown to exist as narrow resonant states in the large
$N_c$ limit of QCD. The width of these states is proportional to $1/N_c$.
Possible phenomenological implications for the world of $N_c=3$ are discussed.
| [
{
"created": "Thu, 15 Jan 1998 21:38:33 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Cohen",
"Thomas D.",
""
]
] | Exotic mesons with quantum numbers of a hybrid ($\bar{q} q g$) such as $J^{PC} = 1^{-+}$are shown to exist as narrow resonant states in the large $N_c$ limit of QCD. The width of these states is proportional to $1/N_c$. Possible phenomenological implications for the world of $N_c=3$ are discussed. |
hep-ph/9806333 | 97sm16 | S. Hino and S. Kumano (Saga University) | Studies of structure functions at a low-energy facility | 1+10 pages, LATEX2e with epsfig.sty, wrapfig.sty, and amsmath.sty, 5
eps figures. Talk given at the Workshop on Future Plan at RCNP, Osaka, Japan,
March 9-10, 1998, to be published in proceedings. Complete postscript file
including the figures is available at
http://www.cc.saga-u.ac.jp/saga-u/riko/physics/quantum1/structure.html Email:
97sm16@edu.cc.saga-u.ac.jp, kumanos@cc.saga-u.ac.jp | null | null | SAGA-HE-135-98 | hep-ph hep-ex nucl-th | null | We discuss the studies on structure functions at the possible future RCNP
facility. At this stage, an electron-proton or proton-proton collider with
sqrt{s}=5 - 10 GeV is considered. We explain large-x physics, nuclear
modification of sea-quark and gluon distributions, and tensor spin structure
function as the interesting topics at the facility. The large-x parton
distributions are important for finding new physics beyond QCD in anomalous
events such as the CDF jet data. The nuclear parton distributions are valuable
in detecting a quark-gluon signature in heavy-ion reactions. The tensor
structure function b_1 is a new field of high-energy spin physics. Considering
these physics possibilities, we believe that the possible RCNP facility is
important for the hadron-structure community.
| [
{
"created": "Wed, 10 Jun 1998 05:52:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hino",
"S.",
"",
"Saga University"
],
[
"Kumano",
"S.",
"",
"Saga University"
]
] | We discuss the studies on structure functions at the possible future RCNP facility. At this stage, an electron-proton or proton-proton collider with sqrt{s}=5 - 10 GeV is considered. We explain large-x physics, nuclear modification of sea-quark and gluon distributions, and tensor spin structure function as the interesting topics at the facility. The large-x parton distributions are important for finding new physics beyond QCD in anomalous events such as the CDF jet data. The nuclear parton distributions are valuable in detecting a quark-gluon signature in heavy-ion reactions. The tensor structure function b_1 is a new field of high-energy spin physics. Considering these physics possibilities, we believe that the possible RCNP facility is important for the hadron-structure community. |
1608.01454 | Johan Bijnens | Johan Bijnens and Johan Relefors (Lund) | Pion light-by-light contributions to the muon $g-2$ | 26 pages | null | 10.1007/JHEP09(2016)113 | LU TP 16-44 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper contains some new results on the hadronic light-by-light
contribution (HLbL) to the muon $g-2$. The first part argues that we can expect
large effects from disconnected diagrams in present and future calculations by
lattice QCD of HLbL. The argument is based on the dominance of pseudo-scalar
meson exchange.
In the second part, we revisit the pion loop HLbL contribution to the muon
anomalous magnetic moment. We study it in the framework of some models studied
earlier, pure pion loop, full VMD and hidden local symmetry for inclusion of
vector mesons. In addition we study possible ways to include the axial-vector
meson. The main part of the work is a detailed study of how the different
momentum regions contribute. We derive a short distance constraint on the
$\gamma^*\gamma^*\to\pi\pi$ amplitude and use this as a constraint on the
models used for the pion loop. As a byproduct we present the general result for
integration using the Gegenbauer polynomial method.
| [
{
"created": "Thu, 4 Aug 2016 08:11:41 GMT",
"version": "v1"
}
] | 2016-10-12 | [
[
"Bijnens",
"Johan",
"",
"Lund"
],
[
"Relefors",
"Johan",
"",
"Lund"
]
] | This paper contains some new results on the hadronic light-by-light contribution (HLbL) to the muon $g-2$. The first part argues that we can expect large effects from disconnected diagrams in present and future calculations by lattice QCD of HLbL. The argument is based on the dominance of pseudo-scalar meson exchange. In the second part, we revisit the pion loop HLbL contribution to the muon anomalous magnetic moment. We study it in the framework of some models studied earlier, pure pion loop, full VMD and hidden local symmetry for inclusion of vector mesons. In addition we study possible ways to include the axial-vector meson. The main part of the work is a detailed study of how the different momentum regions contribute. We derive a short distance constraint on the $\gamma^*\gamma^*\to\pi\pi$ amplitude and use this as a constraint on the models used for the pion loop. As a byproduct we present the general result for integration using the Gegenbauer polynomial method. |
hep-ph/9809499 | John LoSecco | J.M. LoSecco | What the Atmospheric Neutrino Anomaly is Not | 11 pages 4 figures | null | null | UNDPDK-98-04c | hep-ph | null | The atmospheric neutrino anomaly is the apparent reduction of the
$\nu_{\mu}/\nu_{e}$ ratio observed in underground detectors. It represents
either a reduction in the muon neutrino interaction rate or an excess of the
electron neutrino interaction rate, or both.
Unable to answer the question of ``What else could it be?'' this paper
explores a number of alternatives which do not seem to be viable. Various
methods to reduce the apparent muon rate or to increase the apparent electron
rate are discussed.
Perhaps our bias that the interactions are due to neutrinos of atmospheric
origin is incorrect. Both of these assumptions need to be confirmed. Efforts to
reduce uncertainties in the estimated atmospheric neutrino flux would also help
to narrow the possibilities further.
| [
{
"created": "Wed, 23 Sep 1998 13:09:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"LoSecco",
"J. M.",
""
]
] | The atmospheric neutrino anomaly is the apparent reduction of the $\nu_{\mu}/\nu_{e}$ ratio observed in underground detectors. It represents either a reduction in the muon neutrino interaction rate or an excess of the electron neutrino interaction rate, or both. Unable to answer the question of ``What else could it be?'' this paper explores a number of alternatives which do not seem to be viable. Various methods to reduce the apparent muon rate or to increase the apparent electron rate are discussed. Perhaps our bias that the interactions are due to neutrinos of atmospheric origin is incorrect. Both of these assumptions need to be confirmed. Efforts to reduce uncertainties in the estimated atmospheric neutrino flux would also help to narrow the possibilities further. |
hep-ph/9608401 | Hans Lotter | J.Bartels, A.DeRoeck, H.Lotter | The $\gamma^*\gamma^*$ Total Cross Section and the BFKL Pomeron at
$e^{+}e^{-}$ Collider | 10 pages, latex, 5 figures included using epsfig | Phys.Lett. B389 (1996) 742-748 | 10.1016/S0370-2693(96)01344-5 | DESY 96-168 | hep-ph | null | We present a numerical estimate of the $\gamma^* \gamma^*$ total cross
section at LEP and at the designed $e^+e^-$ Next Linear Collider (NLC), based
upon the BFKL Pomeron. We find for the linear collider that the event rate is
substantial provided electrons scattered under small angles can be detected,
and a measurement of this cross section provides an excellent test of the BFKL
Pomeron. For LEP, although the number of events is substantially smaller, an
initial study of this process is feasible.
| [
{
"created": "Wed, 21 Aug 1996 17:37:22 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Bartels",
"J.",
""
],
[
"DeRoeck",
"A.",
""
],
[
"Lotter",
"H.",
""
]
] | We present a numerical estimate of the $\gamma^* \gamma^*$ total cross section at LEP and at the designed $e^+e^-$ Next Linear Collider (NLC), based upon the BFKL Pomeron. We find for the linear collider that the event rate is substantial provided electrons scattered under small angles can be detected, and a measurement of this cross section provides an excellent test of the BFKL Pomeron. For LEP, although the number of events is substantially smaller, an initial study of this process is feasible. |
hep-ph/0407110 | Tomoi Koide | T. Koide | Langevin Dynamics of Chiral Phase Transition at Finite Temperature and
Density | 3 pages, 3 figures, Talk given at "Hadron Physics - RANP 2004", Rio
de Janeiro, Brazil, 28 March-3 April | null | 10.1063/1.1843677 | null | hep-ph | null | We derive the linear Langevin equation to describe the dynamics of the chiral
phase transition above the critical temperature by applying the projection
operator method to the Nambu-Jona-Lasinio model at finite temperature and
density. The relaxation time of the critical fluctuations increases as the
temperature approaches toward the critical temperature because of the critical
slowing down. The critical slowing down is enhanced in low temperature and
large chemical potential region and around the tricritical point.
| [
{
"created": "Fri, 9 Jul 2004 11:31:34 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Koide",
"T.",
""
]
] | We derive the linear Langevin equation to describe the dynamics of the chiral phase transition above the critical temperature by applying the projection operator method to the Nambu-Jona-Lasinio model at finite temperature and density. The relaxation time of the critical fluctuations increases as the temperature approaches toward the critical temperature because of the critical slowing down. The critical slowing down is enhanced in low temperature and large chemical potential region and around the tricritical point. |
0812.3299 | Przemyslaw Stoklosa | S.Jadach (IFJ-PAN, Cracow), W.Placzek (Jagiellonian U.), M.Skrzypek
(IFJ-PAN, Cracow), P.Stoklosa (IFJ-PAN, Cracow) | Markovian Monte Carlo program EvolFMC v.2 for solving QCD evolution
equations | 38 pages, 9 Postscript figures | Comput.Phys.Commun.181:393-412,2010 | 10.1016/j.cpc.2009.09.023 | IFJPAN-IV-2008-7 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the program EvolFMC v.2 that solves the evolution equations in QCD
for the parton momentum distributions by means of the Monte Carlo technique
based on the Markovian process. The program solves the DGLAP-type evolution as
well as modified-DGLAP ones. In both cases the evolution can be performed in
the LO or NLO approximation. The quarks are treated as massless. The overall
technical precision of the code has been established at 0.05% precision level.
This way, for the first time ever, we demonstrate that with the Monte Carlo
method one can solve the evolution equations with precision comparable to the
other numerical methods.
| [
{
"created": "Wed, 17 Dec 2008 14:06:57 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Aug 2009 14:58:50 GMT",
"version": "v2"
}
] | 2009-12-04 | [
[
"Jadach",
"S.",
"",
"IFJ-PAN, Cracow"
],
[
"Placzek",
"W.",
"",
"Jagiellonian U."
],
[
"Skrzypek",
"M.",
"",
"IFJ-PAN, Cracow"
],
[
"Stoklosa",
"P.",
"",
"IFJ-PAN, Cracow"
]
] | We present the program EvolFMC v.2 that solves the evolution equations in QCD for the parton momentum distributions by means of the Monte Carlo technique based on the Markovian process. The program solves the DGLAP-type evolution as well as modified-DGLAP ones. In both cases the evolution can be performed in the LO or NLO approximation. The quarks are treated as massless. The overall technical precision of the code has been established at 0.05% precision level. This way, for the first time ever, we demonstrate that with the Monte Carlo method one can solve the evolution equations with precision comparable to the other numerical methods. |
2308.01356 | Ting Gao | Yohei Ema, Ting Gao, Maxim Pospelov | Muon spin force | 5 pages, 1 figure + references and supplemental material | null | null | UMN-TH-4219/23,FTPI-MINN-23-12 | hep-ph hep-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | Current discrepancy between the measurement and the prediction of the muon
anomalous magnetic moment can be resolved in the presence of a long-range force
created by ordinary atoms acting on the muon spin via axial-vector and/or
pseudoscalar coupling, and requiring a tiny, $\mathcal{O}(10^{-13}\,{\rm eV})$
spin energy splitting between muon state polarized in the vertical direction.
We suggest that an extension of the muon spin resonance ($\mu$SR) experiments
can provide a definitive test of this class of models. We also derive indirect
constraints on the strength of the muon spin force, by considering the
muon-loop-induced interactions between nuclear spin and external directions.
The limits on the muon spin force extracted from the comparison of
$^{199}$Hg/$^{201}$Hg and $^{129}$Xe/$^{131}$Xe spin precession are strong for
the pseudoscalar coupling, but are significantly relaxed for the axial-vector
one. These limits suffer from significant model uncertainties, poorly known
proton/neutron spin content of these nuclei, and therefore do not exclude the
possibility of a muon spin force relevant for the muon $g-2$.
| [
{
"created": "Wed, 2 Aug 2023 18:00:31 GMT",
"version": "v1"
}
] | 2023-08-04 | [
[
"Ema",
"Yohei",
""
],
[
"Gao",
"Ting",
""
],
[
"Pospelov",
"Maxim",
""
]
] | Current discrepancy between the measurement and the prediction of the muon anomalous magnetic moment can be resolved in the presence of a long-range force created by ordinary atoms acting on the muon spin via axial-vector and/or pseudoscalar coupling, and requiring a tiny, $\mathcal{O}(10^{-13}\,{\rm eV})$ spin energy splitting between muon state polarized in the vertical direction. We suggest that an extension of the muon spin resonance ($\mu$SR) experiments can provide a definitive test of this class of models. We also derive indirect constraints on the strength of the muon spin force, by considering the muon-loop-induced interactions between nuclear spin and external directions. The limits on the muon spin force extracted from the comparison of $^{199}$Hg/$^{201}$Hg and $^{129}$Xe/$^{131}$Xe spin precession are strong for the pseudoscalar coupling, but are significantly relaxed for the axial-vector one. These limits suffer from significant model uncertainties, poorly known proton/neutron spin content of these nuclei, and therefore do not exclude the possibility of a muon spin force relevant for the muon $g-2$. |
1507.05976 | Michal Praszalowicz | Larry McLerran and Michal Praszalowicz | Fluctuations and the rapidity dependence of charged particles spectra in
fixed centrality bins in p$A$ collisions | New title, 16 pages, 7 figures, to appear in Annals of Physics | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | We argue that large fluctuations in the saturation momentum are necessary to
explain the ATLAS and ALICE data on pA collisions measured at the LHC. Using a
form for the distribution of fluctuations motivated by theoretical studies of
the non-linear evolution equations for the Color Glass Condensate, we find a
remarkably good agreement between theory and the measured distributions. If the
saturation momentum fluctuates, we argue that the cross section for a proton
probe should also fluctuate, consistent with previous observations. Finally we
discuss these results and their possible consistency with what is known about
multiplicity fluctuations in such collisions, and attempts to describe the
ridge effect from properties of the initial state.
| [
{
"created": "Tue, 21 Jul 2015 20:07:49 GMT",
"version": "v1"
},
{
"created": "Thu, 19 May 2016 12:17:24 GMT",
"version": "v2"
}
] | 2016-05-20 | [
[
"McLerran",
"Larry",
""
],
[
"Praszalowicz",
"Michal",
""
]
] | We argue that large fluctuations in the saturation momentum are necessary to explain the ATLAS and ALICE data on pA collisions measured at the LHC. Using a form for the distribution of fluctuations motivated by theoretical studies of the non-linear evolution equations for the Color Glass Condensate, we find a remarkably good agreement between theory and the measured distributions. If the saturation momentum fluctuates, we argue that the cross section for a proton probe should also fluctuate, consistent with previous observations. Finally we discuss these results and their possible consistency with what is known about multiplicity fluctuations in such collisions, and attempts to describe the ridge effect from properties of the initial state. |
1810.12303 | Joachim Brod | Joachim Brod, Emmanuel Stamou | Electric dipole moment constraints on CP-violating heavy-quark Yukawas
at next-to-leading order | 33 pages, 9 figures; calculation using Larin scheme for gamma5;
version as published in JHEP | JHEP 07 (2021) 080 | 10.1007/JHEP07(2021)080 | DO-TH 18/22 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Electric dipole moments are sensitive probes of new phases in the Higgs
Yukawa couplings. We calculate the complete two-loop QCD anomalous dimension
matrix for the mixing of CP-odd scalar and tensor operators and apply our
results for a phenomenological study of CP violation in the bottom and charm
Yukawa couplings. We find large shifts of the induced Wilson coefficients at
next-to-leading-logarithmic order. Using the experimental bound on the electric
dipole moment of the neutron, we update the constraints on CP-violating phases
in the bottom and charm quark Yukawas.
| [
{
"created": "Mon, 29 Oct 2018 18:00:01 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Aug 2019 23:18:54 GMT",
"version": "v2"
},
{
"created": "Wed, 7 Jul 2021 19:01:45 GMT",
"version": "v3"
}
] | 2021-07-20 | [
[
"Brod",
"Joachim",
""
],
[
"Stamou",
"Emmanuel",
""
]
] | Electric dipole moments are sensitive probes of new phases in the Higgs Yukawa couplings. We calculate the complete two-loop QCD anomalous dimension matrix for the mixing of CP-odd scalar and tensor operators and apply our results for a phenomenological study of CP violation in the bottom and charm Yukawa couplings. We find large shifts of the induced Wilson coefficients at next-to-leading-logarithmic order. Using the experimental bound on the electric dipole moment of the neutron, we update the constraints on CP-violating phases in the bottom and charm quark Yukawas. |
1805.04573 | Lian-Rong Dai | L. R. Dai, R. Pavao, S. Sakai, E. Oset | $\tau^- \to \nu_{\tau} M_1 M_2$, with $M_1, M_2$ pseudoscalar or vector
mesons | 38 pages, 2 figures, 7 tables | null | 10.1140/epja/i2019-12690-9 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a calculation of the $\tau^- \to \nu_{\tau} M_1 M_2$, with $M_1,
M_2$ either pseudoscalar or vector mesons using the basic weak interaction and
angular momentum algebra to relate the different processes. The formalism also
leads to a different interpretation of the role played by $G$-parity in these
decays. We also observe that, while $p$-wave $M_1 M_2$ production is compatible
with chiral perturbation theory and experiment, $VP$ and $VV$ $p$-wave
production is clearly incompatible with experiment and we develop the formalism
also in this case. We compare our results with experiment and make predictions
for unmeasured decays, and we show the value of these reactions, particularly
if the $M_1 M_2$ mass distribution is measured, as a tool to learn about the
meson-meson interaction and the nature of some resonances, coupling to two
mesons, which are produced in such decays.
| [
{
"created": "Fri, 11 May 2018 19:50:33 GMT",
"version": "v1"
}
] | 2019-03-27 | [
[
"Dai",
"L. R.",
""
],
[
"Pavao",
"R.",
""
],
[
"Sakai",
"S.",
""
],
[
"Oset",
"E.",
""
]
] | We perform a calculation of the $\tau^- \to \nu_{\tau} M_1 M_2$, with $M_1, M_2$ either pseudoscalar or vector mesons using the basic weak interaction and angular momentum algebra to relate the different processes. The formalism also leads to a different interpretation of the role played by $G$-parity in these decays. We also observe that, while $p$-wave $M_1 M_2$ production is compatible with chiral perturbation theory and experiment, $VP$ and $VV$ $p$-wave production is clearly incompatible with experiment and we develop the formalism also in this case. We compare our results with experiment and make predictions for unmeasured decays, and we show the value of these reactions, particularly if the $M_1 M_2$ mass distribution is measured, as a tool to learn about the meson-meson interaction and the nature of some resonances, coupling to two mesons, which are produced in such decays. |
hep-ph/9412233 | null | C.W. Kim | Do the Age of the Universe and the Hubble Constant Depend on What Scale
One Observes Them? | Revtex file, 9 pages (no figures) | Phys.Lett.B355:65-70,1995 | 10.1016/0370-2693(95)00775-G | JHU-TIPAC 940020; DFF-213/11/94 | hep-ph astro-ph gr-qc | null | The apparent cosmological conflict between the age of the Universe, predicted
in the standard Friedman cosmology by using the recent measurement of the
larger Hubble constant from a direct calibration of the distance to the Virgo
galaxy cluster, and the ages of the oldest stars and globular clusters is
resolved by invoking the scale dependence of cosmological quantities, including
the age of the Universe. The distance dependence or the running of cosmological
quantities is motivated by the asymptotically-free higher- derivative quantum
gravity. The running can also be derived by ``properly" modifying the Friedman
equations. This property can also provide partial explanation of the apparent
disagreement between the two recent measurements of the Hubble constant using
NGC 4571 at 15 Mpc and NGC 5253 at 4 Mpc.
| [
{
"created": "Mon, 5 Dec 1994 16:02:32 GMT",
"version": "v1"
}
] | 2010-11-30 | [
[
"Kim",
"C. W.",
""
]
] | The apparent cosmological conflict between the age of the Universe, predicted in the standard Friedman cosmology by using the recent measurement of the larger Hubble constant from a direct calibration of the distance to the Virgo galaxy cluster, and the ages of the oldest stars and globular clusters is resolved by invoking the scale dependence of cosmological quantities, including the age of the Universe. The distance dependence or the running of cosmological quantities is motivated by the asymptotically-free higher- derivative quantum gravity. The running can also be derived by ``properly" modifying the Friedman equations. This property can also provide partial explanation of the apparent disagreement between the two recent measurements of the Hubble constant using NGC 4571 at 15 Mpc and NGC 5253 at 4 Mpc. |
hep-ph/0005317 | Cong-Feng Qiao | Cong-Feng Qiao (Uni. Hamburg) and Changzheng Yuan (Orsay) | Finding eta_c' and h_c at HERA-B | Typos corrected, comments and references added. RevTex. To appear in
Phys. Rev. D | Phys.Rev. D63 (2001) 014007 | 10.1103/PhysRevD.63.014007 | DESY 00-081 | hep-ph | null | The production of Charmonium states $\etacp$ and $\hc$ at fixed-target
experiment of $pN$ collisions at HERA-$B$ is considered. It is found that the
HERA-$B$ at DESY is one of the best machines in further confirming and
detecting these two kinds of Charmonia in the near future.
| [
{
"created": "Wed, 31 May 2000 11:17:22 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Oct 2000 08:35:33 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Qiao",
"Cong-Feng",
"",
"Uni. Hamburg"
],
[
"Yuan",
"Changzheng",
"",
"Orsay"
]
] | The production of Charmonium states $\etacp$ and $\hc$ at fixed-target experiment of $pN$ collisions at HERA-$B$ is considered. It is found that the HERA-$B$ at DESY is one of the best machines in further confirming and detecting these two kinds of Charmonia in the near future. |
1607.05862 | Federico Demartin | Federico Demartin, Benedikt Maier, Fabio Maltoni, Kentarou Mawatari,
Marco Zaro | tWH associated production at the LHC | v3: expanded some discussions in the text, improved some plots
(results unchanged) | null | 10.1140/epjc/s10052-017-4601-7 | MCnet-16-30, CP3-16-40, LPSC16158 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study Higgs boson production in association with a top quark and a $W$
boson at the LHC. At NLO in QCD, $tWH$ interferes with $t\bar t H$ and a
procedure to meaningfully separate the two processes needs to be employed. In
order to define $tWH$ production for both total rates and differential
distributions, we consider the diagram removal and diagram subtraction
techniques that have been previously proposed for treating intermediate
resonances at NLO, in particular in the context of $tW$ production. These
techniques feature approximations that need to be carefully taken into account
when theoretical predictions are compared to experimental measurements. To this
aim, we first critically revisit the $tW$ process, for which an extensive
literature exists and where an analogous interference with $t \bar t$
production takes place. We then provide robust results for total and
differential cross sections for $tW$ and $tWH$ at 13 TeV, also matching
short-distance events to a parton shower. We formulate a reliable prescription
to estimate the theoretical uncertainties, including those associated to the
very definition of the process at NLO. Finally, we study the sensitivity to a
non-Standard-Model relative phase between the Higgs couplings to the top quark
and to the $W$ boson in $tWH$ production.
| [
{
"created": "Wed, 20 Jul 2016 08:43:34 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Oct 2016 14:10:10 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Jan 2017 14:15:25 GMT",
"version": "v3"
}
] | 2017-03-08 | [
[
"Demartin",
"Federico",
""
],
[
"Maier",
"Benedikt",
""
],
[
"Maltoni",
"Fabio",
""
],
[
"Mawatari",
"Kentarou",
""
],
[
"Zaro",
"Marco",
""
]
] | We study Higgs boson production in association with a top quark and a $W$ boson at the LHC. At NLO in QCD, $tWH$ interferes with $t\bar t H$ and a procedure to meaningfully separate the two processes needs to be employed. In order to define $tWH$ production for both total rates and differential distributions, we consider the diagram removal and diagram subtraction techniques that have been previously proposed for treating intermediate resonances at NLO, in particular in the context of $tW$ production. These techniques feature approximations that need to be carefully taken into account when theoretical predictions are compared to experimental measurements. To this aim, we first critically revisit the $tW$ process, for which an extensive literature exists and where an analogous interference with $t \bar t$ production takes place. We then provide robust results for total and differential cross sections for $tW$ and $tWH$ at 13 TeV, also matching short-distance events to a parton shower. We formulate a reliable prescription to estimate the theoretical uncertainties, including those associated to the very definition of the process at NLO. Finally, we study the sensitivity to a non-Standard-Model relative phase between the Higgs couplings to the top quark and to the $W$ boson in $tWH$ production. |
hep-ph/0611022 | Andrew Psallidas | Psallidas Andreas | Neutrino and Multidimensional Theories of Fundamental Interactions | Abstract and contents of Ph.D. Thesis. Available in Greek from:
http://users.uoi.gr/neutrino/PHD.pdf | null | null | null | hep-ph | null | In this thesis, the possibility of interpreting the solar and atmospheric
neutrino data within the context of theoretical models is being explored. In
particular, the implications of the Minimal Supersymmetric Standard Model
augmented by a single U(1) anomalous family symmetry for neutrino masses and
mixing angles are investigated. Motivated by the above results, the effect of
introducing a proper second singlet pair is studied resulting to additional
mass entries in the previous model. Also, renormalization effects on neutrino
masses and mixing angles in a supersymmetric string-inspired
SU(4)xSU(2)_LxSU(2)_RxU(1)_X model are discussed. Lastly, D-brane inspired
models are studied with U(3)xU(2)xU(1)^N gauge symmetry in the context of split
supersymmetry.
| [
{
"created": "Thu, 2 Nov 2006 11:19:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Andreas",
"Psallidas",
""
]
] | In this thesis, the possibility of interpreting the solar and atmospheric neutrino data within the context of theoretical models is being explored. In particular, the implications of the Minimal Supersymmetric Standard Model augmented by a single U(1) anomalous family symmetry for neutrino masses and mixing angles are investigated. Motivated by the above results, the effect of introducing a proper second singlet pair is studied resulting to additional mass entries in the previous model. Also, renormalization effects on neutrino masses and mixing angles in a supersymmetric string-inspired SU(4)xSU(2)_LxSU(2)_RxU(1)_X model are discussed. Lastly, D-brane inspired models are studied with U(3)xU(2)xU(1)^N gauge symmetry in the context of split supersymmetry. |
hep-ph/0004247 | Stephan Narison | Stephan Narison (Univ. Montpellier and KEK-Tsukuba) | New QCD estimate of the kaon penguin matrix elements and
epsilon'/epsilon | Latex2e sources 23 pages including 1 Table + espcrc1.sty file.
Version to appear in Nucl. Phys. B | Nucl.Phys.B593:3-30,2001 | 10.1016/S0550-3213(00)00618-0 | Montpellier preprint PM/00-14 and KEK-TH/00-689 | hep-ph hep-ex hep-lat nucl-th | null | Firstly, we use the recent ALEPH/OPAL data on the V-A spectral functions for
fixing the continuum threshold with which the first and second Weinberg sum
rules should be satisfied in the chiral limit. Then, we predict the values of
the low-energy constants m_{\pi^+}-m_{\pi^0}, {L}_{10}, and test the values of
the electroweak kaon penguin matrix elements <Q^{3/2}_{8,7}>_{2\pi} obtained
from DMO--like sum rules. Secondly, we use the data on the \tau-total hadronic
width R_{\tau,V/A} for extracting <Q_8^{3/2}_{2\pi}>, in the {MS}\bar scheme,
and propose some new sum rules for < Q_7^{3/2}>_{2\pi} in the chiral limit,
where the latter require more accurate data for the spectral functions near the
$\tau$-mass. Thirdly, we analyze the effects to the matrix element
<Q_6^{1/2}>_{2\pi}, of the S_2\equiv(\bar uu+\bar dd) component of the I=0
scalar meson, with its parameters fixed from QCD spectral sum rules. Our
results should stimulate a further attention on the r\^ole of the (expected
large) gluonium component of the I=0 scalar meson and of the associated
operator in the K--->\pi\pi amplitude. Finally, using our previous
determinations, we deduce, in the Standard Model (SM), the conservative upper
bound for the CP-violating ratio: \epsilon'/\epsilon < (22\pm 9) 10^{-4}, which
is in agreement with the present measurements.
| [
{
"created": "Thu, 27 Apr 2000 10:50:46 GMT",
"version": "v1"
},
{
"created": "Wed, 10 May 2000 18:56:22 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Oct 2000 19:51:04 GMT",
"version": "v3"
},
{
"created": "Sun, 3 Dec 2000 10:24:41 GMT",
"version": "v4"
}
] | 2009-09-25 | [
[
"Narison",
"Stephan",
"",
"Univ. Montpellier and KEK-Tsukuba"
]
] | Firstly, we use the recent ALEPH/OPAL data on the V-A spectral functions for fixing the continuum threshold with which the first and second Weinberg sum rules should be satisfied in the chiral limit. Then, we predict the values of the low-energy constants m_{\pi^+}-m_{\pi^0}, {L}_{10}, and test the values of the electroweak kaon penguin matrix elements <Q^{3/2}_{8,7}>_{2\pi} obtained from DMO--like sum rules. Secondly, we use the data on the \tau-total hadronic width R_{\tau,V/A} for extracting <Q_8^{3/2}_{2\pi}>, in the {MS}\bar scheme, and propose some new sum rules for < Q_7^{3/2}>_{2\pi} in the chiral limit, where the latter require more accurate data for the spectral functions near the $\tau$-mass. Thirdly, we analyze the effects to the matrix element <Q_6^{1/2}>_{2\pi}, of the S_2\equiv(\bar uu+\bar dd) component of the I=0 scalar meson, with its parameters fixed from QCD spectral sum rules. Our results should stimulate a further attention on the r\^ole of the (expected large) gluonium component of the I=0 scalar meson and of the associated operator in the K--->\pi\pi amplitude. Finally, using our previous determinations, we deduce, in the Standard Model (SM), the conservative upper bound for the CP-violating ratio: \epsilon'/\epsilon < (22\pm 9) 10^{-4}, which is in agreement with the present measurements. |
hep-ph/0009232 | Kingman Cheung | Kingman Cheung (NCTS) | Phenomenology of Radion in Randall-Sundrum Scenario | 20 pages, 11 figures. Added the dijet analysis for the LHC, and a
couple of new references | Phys.Rev. D63 (2001) 056007 | 10.1103/PhysRevD.63.056007 | null | hep-ph hep-ex | null | The success of the Randall-Sundrum scenario relies on stabilization of the
modulus field or the radion, which is the scalar field about the background
geometry. The stabilization mechanism proposed by Goldberger and Wise has the
consequence that this radion is lighter than the graviton Kaluza-Klein states
so that the first particle to be discovered is the radion. In this work, we
study in details the decay, production, and detection of the radion at
hadronic, $e^+ e^-$, and $\gamma\gamma$ colliders.
| [
{
"created": "Wed, 20 Sep 2000 03:50:56 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Dec 2000 08:27:33 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Cheung",
"Kingman",
"",
"NCTS"
]
] | The success of the Randall-Sundrum scenario relies on stabilization of the modulus field or the radion, which is the scalar field about the background geometry. The stabilization mechanism proposed by Goldberger and Wise has the consequence that this radion is lighter than the graviton Kaluza-Klein states so that the first particle to be discovered is the radion. In this work, we study in details the decay, production, and detection of the radion at hadronic, $e^+ e^-$, and $\gamma\gamma$ colliders. |
hep-ph/0306246 | null | A.L. Kataev (Institute for Nuclear Research, Moscow, Russia) | The consequences of the relations between non-singlet contributions to
$g_1^N$ and $F_1^N$ structure functions within infrared renormalon model | 5 pages, talk at XI International Workshop on Deep Inelastic
Scattering, St.Petersburg, Russia, 23-27 April 2003 | null | null | null | hep-ph | null | We report on the following consequences of the relations between non-singlet
contributions to $g_1^N$ and $F_1^N$ structure functions found within infrared
renormalon model: the discovery of new next-to-leading order inequalities
between non-singlet polarized and unpolarized parton densities, and the
existence of the effects of similarity between non-perturbative and
perturbative contributions to the unpolarized and polarized Bjorken sum rules.
| [
{
"created": "Wed, 25 Jun 2003 07:25:26 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kataev",
"A. L.",
"",
"Institute for Nuclear Research, Moscow, Russia"
]
] | We report on the following consequences of the relations between non-singlet contributions to $g_1^N$ and $F_1^N$ structure functions found within infrared renormalon model: the discovery of new next-to-leading order inequalities between non-singlet polarized and unpolarized parton densities, and the existence of the effects of similarity between non-perturbative and perturbative contributions to the unpolarized and polarized Bjorken sum rules. |
0902.3320 | A. V. Luchinsky | S. V. Donskov, A. K. Likhoded, A. V. Luchinsky, V. D. Samoylenko | Scalar mesons in eta' -> eta pi0 pi0 decay | 6 pages, 4 figures. The text is extended. Errors in figures are
corrected, some refreces added | null | 10.2478/s11534-009-0088-7 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The decay $\eta'\to\eta\pi^{0}\pi^{0}$ is studied in the framework of isobar
model. It is shown, that good agreement with the experiment is achieved if
$a_0$- and $\sigma$-meson contributions are taken into account. The
contribution of $a_0$-meson is dominant, but $\sigma$-meson is necessary to
reproduce the form of experimental Dalitz plot. Instead of usual Breit-Wigner
form of $\sigma$-meson propagator we use parametrization of $\pi\pi$-amplitude,
that satisfies analiticity, crossing, unitarity and chirality constraints. This
amplitude has a pole in complex plane, that corresponds to $\sigma$-meson and
describe experimental data on $\pi\pi$-scattering in $K_{e4}$ decay.
| [
{
"created": "Thu, 19 Feb 2009 08:11:33 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Apr 2009 06:46:19 GMT",
"version": "v2"
}
] | 2018-02-14 | [
[
"Donskov",
"S. V.",
""
],
[
"Likhoded",
"A. K.",
""
],
[
"Luchinsky",
"A. V.",
""
],
[
"Samoylenko",
"V. D.",
""
]
] | The decay $\eta'\to\eta\pi^{0}\pi^{0}$ is studied in the framework of isobar model. It is shown, that good agreement with the experiment is achieved if $a_0$- and $\sigma$-meson contributions are taken into account. The contribution of $a_0$-meson is dominant, but $\sigma$-meson is necessary to reproduce the form of experimental Dalitz plot. Instead of usual Breit-Wigner form of $\sigma$-meson propagator we use parametrization of $\pi\pi$-amplitude, that satisfies analiticity, crossing, unitarity and chirality constraints. This amplitude has a pole in complex plane, that corresponds to $\sigma$-meson and describe experimental data on $\pi\pi$-scattering in $K_{e4}$ decay. |
hep-ph/0504056 | Fl. Stancu | Fl. Stancu | Structure of light and heavy pentaquarks | 6 pages, 2 figures, Plenary talk at the 10th International Symposium
on Meson-Nucleon Physics and the Structure of the Nucleon (MENU04), Beijing,
August 29 - September 4, 2004, reference added | Int.J.Mod.Phys. A20 (2005) 1797-1802 | 10.1142/S0217751X05023359 | null | hep-ph | null | Light and heavy pentaquarks are described within a constituent quark model
based on a spin-flavor hyperfine interaction. In this model the lowest state
acquires positive parity. The masses of the light antidecuplet members are
calculated dynamically using a variational method. It is shown that the octet
and antidecuplet states with the same quantum numbers mix ideally due to
SU(3)$_F$ breaking. Masses of the charmed antisextet pentaquarks are predicted
within the same model.
| [
{
"created": "Thu, 7 Apr 2005 16:46:33 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Apr 2005 11:29:43 GMT",
"version": "v2"
},
{
"created": "Thu, 12 May 2005 13:35:19 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Stancu",
"Fl.",
""
]
] | Light and heavy pentaquarks are described within a constituent quark model based on a spin-flavor hyperfine interaction. In this model the lowest state acquires positive parity. The masses of the light antidecuplet members are calculated dynamically using a variational method. It is shown that the octet and antidecuplet states with the same quantum numbers mix ideally due to SU(3)$_F$ breaking. Masses of the charmed antisextet pentaquarks are predicted within the same model. |
1601.00259 | Yueling Yang | Junfeng Sun, Yueling Yang, Qingxia Li, Gongru Lu, Jinshu Huang, Qin
Chang | The ${\Upsilon}(1S)$ ${\to}$ $B_{c}{\rho}$ decay with perturbative QCD
approach | 14 pages, revtex | Nucl. Phys. B 909, 186 (2016) | 10.1016/j.nuclphysb.2016.05.012 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | With the potential prospects of the ${\Upsilon}(1S)$ data samples at the
running LHC and upcoming SuperKEKB, the ${\Upsilon}(1S)$ ${\to}$ $B_{c}{\rho}$
weak decays are studied with the pQCD approach. It is found that (1) the lion's
share of branching ratio comes from the longitudinal polarization helicity
amplitudes; (2) branching ratio for the ${\Upsilon}(1S)$ ${\to}$ $B_{c}{\rho}$
decay can reach up to ${\cal O}(10^{-9})$, which might be hopefully measurable.
| [
{
"created": "Sun, 3 Jan 2016 08:42:27 GMT",
"version": "v1"
},
{
"created": "Wed, 18 May 2016 00:16:05 GMT",
"version": "v2"
}
] | 2016-07-26 | [
[
"Sun",
"Junfeng",
""
],
[
"Yang",
"Yueling",
""
],
[
"Li",
"Qingxia",
""
],
[
"Lu",
"Gongru",
""
],
[
"Huang",
"Jinshu",
""
],
[
"Chang",
"Qin",
""
]
] | With the potential prospects of the ${\Upsilon}(1S)$ data samples at the running LHC and upcoming SuperKEKB, the ${\Upsilon}(1S)$ ${\to}$ $B_{c}{\rho}$ weak decays are studied with the pQCD approach. It is found that (1) the lion's share of branching ratio comes from the longitudinal polarization helicity amplitudes; (2) branching ratio for the ${\Upsilon}(1S)$ ${\to}$ $B_{c}{\rho}$ decay can reach up to ${\cal O}(10^{-9})$, which might be hopefully measurable. |
1605.08028 | Bilgehan Baris Oner | Y. C. Acar, U. Kaya, B. B. Oner, S. Sultansoy | Color Octet Electron Search Potential of the FCC Based e-p Colliders | 10 pages, 10 figures, 5 tables. arXiv admin note: text overlap with
arXiv:1511.05814 (Parton showering is considered in this version of the
manuscript) | null | 10.1088/1361-6471/aa5f7a | null | hep-ph hep-ex physics.acc-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Resonant production of color octet electron, e_{8}, at the FCC based ep
colliders has been analyzed. It is shown that e-FCC will cover much a wider
region of e_{8} masses compared to the LHC. Moreover, with highest electron
beam energy, e_{8} search potential of the e-FCC exceeds that of FCC pp
collider. If e_{8} is discovered earlier by the FCC pp collider, e-FCC will
give opportunity to handle very important additional information. For example,
compositeness scale can be probed up to hundreds TeV region.
| [
{
"created": "Wed, 25 May 2016 19:56:46 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jun 2016 14:29:24 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Aug 2016 14:55:42 GMT",
"version": "v3"
},
{
"created": "Mon, 31 Oct 2016 15:03:22 GMT",
"version": "v4"
}
] | 2017-04-05 | [
[
"Acar",
"Y. C.",
""
],
[
"Kaya",
"U.",
""
],
[
"Oner",
"B. B.",
""
],
[
"Sultansoy",
"S.",
""
]
] | Resonant production of color octet electron, e_{8}, at the FCC based ep colliders has been analyzed. It is shown that e-FCC will cover much a wider region of e_{8} masses compared to the LHC. Moreover, with highest electron beam energy, e_{8} search potential of the e-FCC exceeds that of FCC pp collider. If e_{8} is discovered earlier by the FCC pp collider, e-FCC will give opportunity to handle very important additional information. For example, compositeness scale can be probed up to hundreds TeV region. |
0902.4100 | Korneliy Todyshev | K.Yu.Todyshev | The application Breit-Wigner form with radiative corrections to the
resonance fitting | 3 pages | null | null | null | hep-ph physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The nonrelativistic and relativistic Breit-Wigner forms are conventionally
used for the resonance fitting. In this note we consider the application of the
Breit-Wigner formula with radiative corrections in initial state.
| [
{
"created": "Tue, 24 Feb 2009 09:10:29 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Mar 2009 09:43:22 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Apr 2009 03:40:23 GMT",
"version": "v3"
}
] | 2009-04-20 | [
[
"Todyshev",
"K. Yu.",
""
]
] | The nonrelativistic and relativistic Breit-Wigner forms are conventionally used for the resonance fitting. In this note we consider the application of the Breit-Wigner formula with radiative corrections in initial state. |
1701.04338 | Fa Peng Huang | Fa Peng Huang, Xinmin Zhang | Probing the gauge symmetry breaking of the early universe in 3-3-1
models and beyond by gravitational waves | Published version for Physics Letters B | Physics Letters B 788 (2019) 288-294 | 10.1016/j.physletb.2018.11.024 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Taking the 3-3-1 models (with $SU(3)_c \otimes SU(3)_L \otimes U(1)_Y$ gauge
group) as examples, we study that a class of new physics models with extended
gauge group could undergo one or several first-order phase transitions
associated with the spontaneously symmetry breaking processes during the
evolution of the universe, which can produce detectable phase transition
gravitational wave (GW) signals at future GW experiments, such as LISA, BBO,
DECIGO, SKA and aLIGO. These GW signals can provide new sources of GWs with
different peak frequencies, and can be used to probe the evolution history of
the universe.
| [
{
"created": "Mon, 16 Jan 2017 15:50:52 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Feb 2017 12:51:40 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Nov 2018 13:03:49 GMT",
"version": "v3"
},
{
"created": "Fri, 30 Nov 2018 13:30:01 GMT",
"version": "v4"
}
] | 2018-12-03 | [
[
"Huang",
"Fa Peng",
""
],
[
"Zhang",
"Xinmin",
""
]
] | Taking the 3-3-1 models (with $SU(3)_c \otimes SU(3)_L \otimes U(1)_Y$ gauge group) as examples, we study that a class of new physics models with extended gauge group could undergo one or several first-order phase transitions associated with the spontaneously symmetry breaking processes during the evolution of the universe, which can produce detectable phase transition gravitational wave (GW) signals at future GW experiments, such as LISA, BBO, DECIGO, SKA and aLIGO. These GW signals can provide new sources of GWs with different peak frequencies, and can be used to probe the evolution history of the universe. |
hep-ph/9802309 | A. Harindranath | A. Harindranath and Rajen Kundu | Utility of Galilean Symmetry in Light-Front Perturbation Theory: A
Nontrivial Example in QCD | RevTeX, five PostScript figures | Int.J.Mod.Phys. A13 (1998) 4591-4604 | 10.1142/S0217751X98002201 | null | hep-ph | null | Investigations have revealed a very complex structure for the coefficient
functions accompanying the divergences for individual time ($x^+$) ordered
diagrams in light-front perturbation theory. No guidelines seem to be available
to look for possible mistakes in the structure of these coefficient functions
emerging at the end of a long and tedious calculation, in contrast to covariant
field theory. Since, in light-front field theory, transverse boost generator is
a kinematical operator which acts just as the two-dimensional Galilean boost
generator in non-relativistic dynamics, it may provide some constraint on the
resulting structures. In this work we investigate the utility of Galilean
symmetry beyond tree level in the context of coupling constant renormalization
in light-front QCD using the two-component formalism. We show that for each
$x^+$ ordered diagram separately, underlying transverse boost symmetry fixes
relative signs of terms in the coefficient functions accompanying the diverging
logarithms. We also summarize the results leading to coupling constant
renormalization for the most general kinematics.
| [
{
"created": "Thu, 12 Feb 1998 10:52:30 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Harindranath",
"A.",
""
],
[
"Kundu",
"Rajen",
""
]
] | Investigations have revealed a very complex structure for the coefficient functions accompanying the divergences for individual time ($x^+$) ordered diagrams in light-front perturbation theory. No guidelines seem to be available to look for possible mistakes in the structure of these coefficient functions emerging at the end of a long and tedious calculation, in contrast to covariant field theory. Since, in light-front field theory, transverse boost generator is a kinematical operator which acts just as the two-dimensional Galilean boost generator in non-relativistic dynamics, it may provide some constraint on the resulting structures. In this work we investigate the utility of Galilean symmetry beyond tree level in the context of coupling constant renormalization in light-front QCD using the two-component formalism. We show that for each $x^+$ ordered diagram separately, underlying transverse boost symmetry fixes relative signs of terms in the coefficient functions accompanying the diverging logarithms. We also summarize the results leading to coupling constant renormalization for the most general kinematics. |
hep-ph/0211139 | Sergei Fedorov | N.O. Agasian, S.M. Fedorov | Instanton infra-red stabilization in the nonperturbative QCD vacuum | 3 pages, 2 figures. Talk given at 5th International Conference on
Quark Confinement and the Hadron Spectrum, Gargnano, Brescia, Italy, 10-14
Sep 2002 | null | 10.1142/9789812704269_0048 | null | hep-ph | null | The influence of nonperturbative fields on instantons in quantum
chromodynamics is studied. Nonperturbative vacuum is described in terms of
nonlocal gauge invariant vacuum averages of gluon field strength. Effective
action for instanton is derived in bilocal approximation and it is demonstrated
that stochastic background gluon fields are responsible for infra-red
(IR)stabilization of instantons. Comparison of obtained instanton size
distribution with lattice data is made.
| [
{
"created": "Sun, 10 Nov 2002 16:16:52 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Agasian",
"N. O.",
""
],
[
"Fedorov",
"S. M.",
""
]
] | The influence of nonperturbative fields on instantons in quantum chromodynamics is studied. Nonperturbative vacuum is described in terms of nonlocal gauge invariant vacuum averages of gluon field strength. Effective action for instanton is derived in bilocal approximation and it is demonstrated that stochastic background gluon fields are responsible for infra-red (IR)stabilization of instantons. Comparison of obtained instanton size distribution with lattice data is made. |
1411.3931 | Clara Peset | Clara Peset | The muonic hydrogen Lamb shift and the proton radius | 4 pages, 3 figures, 4 tables. Proceedings of the talk given at the
17th International Conference on Quantum Chromodynamics (QCD 14), 30 Jun-04
Jul 2014, Montpellier, France. To be published at Nucl.Phys.Proc.Suppl | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain a model independent expression for the muonic hydrogen Lamb shift
up to $\mathcal O (m_\mu \alpha^6, m_\mu \alpha^5 \frac{m_\mu^2}{m_\rho^2})$.
The hadronic effects are controlled by the chiral theory, which allows for
their model independent determination. We give their complete expression
including the pion and Delta particles. Out of this analysis and the
experimental measurement of the muonic hydrogen Lamb shift we determine the
electromagnetic proton radius: $r_p$=0.8412(15) fm. This number is at
6.8$\sigma$ variance with respect to the CODATA value. The parametric control
of the uncertainties allows us to obtain a model independent determination of
the error, which is dominated by hadronic effects.
| [
{
"created": "Fri, 14 Nov 2014 15:12:33 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Peset",
"Clara",
""
]
] | We obtain a model independent expression for the muonic hydrogen Lamb shift up to $\mathcal O (m_\mu \alpha^6, m_\mu \alpha^5 \frac{m_\mu^2}{m_\rho^2})$. The hadronic effects are controlled by the chiral theory, which allows for their model independent determination. We give their complete expression including the pion and Delta particles. Out of this analysis and the experimental measurement of the muonic hydrogen Lamb shift we determine the electromagnetic proton radius: $r_p$=0.8412(15) fm. This number is at 6.8$\sigma$ variance with respect to the CODATA value. The parametric control of the uncertainties allows us to obtain a model independent determination of the error, which is dominated by hadronic effects. |
2403.16568 | Hieu The Pham | Hieu The Pham, Eibun Senaha | Gravitational waves from domain wall collapses and dark matter in the SM
with a complex scalar | 24 pages, 6 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We study domain wall induced by spontaneously broken $\mathbb{Z}_2$ symmetry
and its gravitational wave signature in the standard model with a complex
scalar in connection with dark matter physics. In a minimal setup, a linear
term of the singlet field is added to the scalar potential as an explicit
$\mathbb{Z}_2$ breaking term to make the domain wall unstable. We obtain its
minimal size from cosmological constraints and show that the parameter space
that can be probed by current and future pulsar time array experiments requires
the vacuum expectation value of the singlet field to be greater than
$\mathcal{O}(10-100)$ TeV, along with a singlet-like Higgs mass of
$\mathcal{O}(1-100)$ TeV. However, such a region is severely restricted by the
dark matter relic density, which places an upper bound on the singlet vacuum
expectation value at approximately 200 TeV, and limits the dark matter mass to
about half of the singlet-like Higgs boson mass.
| [
{
"created": "Mon, 25 Mar 2024 09:35:21 GMT",
"version": "v1"
},
{
"created": "Mon, 20 May 2024 18:38:47 GMT",
"version": "v2"
}
] | 2024-05-22 | [
[
"Pham",
"Hieu The",
""
],
[
"Senaha",
"Eibun",
""
]
] | We study domain wall induced by spontaneously broken $\mathbb{Z}_2$ symmetry and its gravitational wave signature in the standard model with a complex scalar in connection with dark matter physics. In a minimal setup, a linear term of the singlet field is added to the scalar potential as an explicit $\mathbb{Z}_2$ breaking term to make the domain wall unstable. We obtain its minimal size from cosmological constraints and show that the parameter space that can be probed by current and future pulsar time array experiments requires the vacuum expectation value of the singlet field to be greater than $\mathcal{O}(10-100)$ TeV, along with a singlet-like Higgs mass of $\mathcal{O}(1-100)$ TeV. However, such a region is severely restricted by the dark matter relic density, which places an upper bound on the singlet vacuum expectation value at approximately 200 TeV, and limits the dark matter mass to about half of the singlet-like Higgs boson mass. |
1811.07892 | Fa Peng Huang | Fa Peng Huang | Hearing the echoes of dark matter and new physics | 4 pages, Proceedings of ICHEP 2018, International conference on high
energy physics, 4-11 July 2018 | PoS(ICHEP2018)397 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the absence of dark matter signal in dark matter direct
detection experiments and new physics signal at LHC, we study how to hear the
echoes of the new physics, especially the dark matter and baryogenesis by new
approaches, such as the gravitational wave experiments.
| [
{
"created": "Mon, 19 Nov 2018 13:27:45 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Dec 2018 09:36:17 GMT",
"version": "v2"
}
] | 2018-12-04 | [
[
"Huang",
"Fa Peng",
""
]
] | Motivated by the absence of dark matter signal in dark matter direct detection experiments and new physics signal at LHC, we study how to hear the echoes of the new physics, especially the dark matter and baryogenesis by new approaches, such as the gravitational wave experiments. |
2303.03771 | Amee Kakadiya | Amee Kakadiya and Ajay Kumar Rai | Spectroscopic Study of $\Omega_{cc}$, $\Omega_{cb}$ and $\Omega_{bb}$
Baryons | 12 pages, 6 figures, 6 tables | null | 10.1007/s00601-023-01796-y | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper, we presented the mass spectra of the doubly heavy $\Omega$
baryons containing one light (strange) quark and two heavy (charm and bottom)
quarks. Our predicted masses can be consider to determine the $J^p$ value for
the resonances detected by experimental facilities in future. The masses of
ground excited states (1S-6S, 1P-3P, 1D-2D, 1F-2F) are calculated for all
possible $J^p$ values, using the Hypercentral Constituent Quark Model (hCQM),
by employing screened potential as confining potential with color-Coloumb
potential. Regge trajectories are also plotted in $(J, M^2)$ plane for natural
and unnatural parities. Doubly heavy Omega states are not declared yet by any
experimental facility. We compared our results to the predictions gained from
other theoretical approaches, and we found that our predictions are quite close
to those of them. Other properties such as magnetic moment (for spin state
$\frac{1}{2}$ and $\frac{3}{2}$) and radiative decay width are calculated using
the enuerated masses.
| [
{
"created": "Tue, 7 Mar 2023 10:04:56 GMT",
"version": "v1"
}
] | 2023-04-19 | [
[
"Kakadiya",
"Amee",
""
],
[
"Rai",
"Ajay Kumar",
""
]
] | In this paper, we presented the mass spectra of the doubly heavy $\Omega$ baryons containing one light (strange) quark and two heavy (charm and bottom) quarks. Our predicted masses can be consider to determine the $J^p$ value for the resonances detected by experimental facilities in future. The masses of ground excited states (1S-6S, 1P-3P, 1D-2D, 1F-2F) are calculated for all possible $J^p$ values, using the Hypercentral Constituent Quark Model (hCQM), by employing screened potential as confining potential with color-Coloumb potential. Regge trajectories are also plotted in $(J, M^2)$ plane for natural and unnatural parities. Doubly heavy Omega states are not declared yet by any experimental facility. We compared our results to the predictions gained from other theoretical approaches, and we found that our predictions are quite close to those of them. Other properties such as magnetic moment (for spin state $\frac{1}{2}$ and $\frac{3}{2}$) and radiative decay width are calculated using the enuerated masses. |
2307.04662 | Pedro Bittar | Pedro Bittar, Gustavo Burdman, Larissa Kiriliuk | Baryogenesis and Dark Matter in the Mirror Twin Higgs | 29 pages, 5 figures | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We consider a natural asymmetric dark matter (ADM) model in the mirror twin
Higgs (MTH). We show that it is possible to obtain the correct dark matter (DM)
abundance when a twin baryon is the DM without the need of explicit breaking of
the MTH $\mathbb{Z}_2$ symmetry in the dimensionless couplings (i.e. without
hard $\mathbb{Z}_2$ breaking). We illustrate how this is possible in a specific
baryogenesis setup, which also leads to ADM. In the simplest scenario we obtain
$m_{\rm DM}\sim O(1)$GeV, just above the proton mass. We show estimates for
direct detection rates at present and future experiments.
| [
{
"created": "Mon, 10 Jul 2023 15:59:41 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Jul 2023 20:27:41 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Oct 2023 14:36:21 GMT",
"version": "v3"
}
] | 2023-10-04 | [
[
"Bittar",
"Pedro",
""
],
[
"Burdman",
"Gustavo",
""
],
[
"Kiriliuk",
"Larissa",
""
]
] | We consider a natural asymmetric dark matter (ADM) model in the mirror twin Higgs (MTH). We show that it is possible to obtain the correct dark matter (DM) abundance when a twin baryon is the DM without the need of explicit breaking of the MTH $\mathbb{Z}_2$ symmetry in the dimensionless couplings (i.e. without hard $\mathbb{Z}_2$ breaking). We illustrate how this is possible in a specific baryogenesis setup, which also leads to ADM. In the simplest scenario we obtain $m_{\rm DM}\sim O(1)$GeV, just above the proton mass. We show estimates for direct detection rates at present and future experiments. |
hep-ph/0307387 | Tsutomu Tashiro | Tsutomu Tashiro, Shin-ichi Nakariki (Okayama Univ. Sci.), Hujio Noda
(Ibaraki Univ.), Kisei Kinoshita (Kagoshima Univ.), Shuxin Lan (Okayama
Univ.) | Leading Effects in Hadroproductions of Lambda_c and D From Constituent
Quark-Diquark Cascade Picture | 11 pages, 5 figures, v2:some explanations added, references added,
typos corrected, v3: top margin changed | Int.J.Mod.Phys. A19 (2004) 599-612 | 10.1142/S0217751X04017057 | null | hep-ph | null | We discuss the hadroproductions of Lambda_c, Lambda_c bar, D and D bar in the
framework of the constituent quark-diquark cascade model taking into account
the valence quark annihilation. The spectra of Lambda_c and Lambda_c bar in pA,
Sigma^-A and pi^-A collisions are well explained by the model using the values
of parameters used in hadroproductions of D and D bar. It is shown that the
role of valence diquark in the incident baryon is important for D bar
productions as well as for Lambda_c production.
| [
{
"created": "Thu, 31 Jul 2003 09:52:23 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Apr 2004 09:16:11 GMT",
"version": "v2"
},
{
"created": "Wed, 7 Apr 2004 18:24:55 GMT",
"version": "v3"
}
] | 2016-12-21 | [
[
"Tashiro",
"Tsutomu",
"",
"Okayama Univ. Sci."
],
[
"Nakariki",
"Shin-ichi",
"",
"Okayama Univ. Sci."
],
[
"Noda",
"Hujio",
"",
"Ibaraki Univ."
],
[
"Kinoshita",
"Kisei",
"",
"Kagoshima Univ."
],
[
"Lan",
"Shuxin",
"",
"Okayama\n Univ."
]
] | We discuss the hadroproductions of Lambda_c, Lambda_c bar, D and D bar in the framework of the constituent quark-diquark cascade model taking into account the valence quark annihilation. The spectra of Lambda_c and Lambda_c bar in pA, Sigma^-A and pi^-A collisions are well explained by the model using the values of parameters used in hadroproductions of D and D bar. It is shown that the role of valence diquark in the incident baryon is important for D bar productions as well as for Lambda_c production. |
2011.05312 | Jordan Wilson-Gerow | Jordan Wilson-Gerow | Yang-Mills Gauss law and the heavy quark binding energy in the presence
of a dimension-2 gluon condensate | 11 pages | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the binding energy of a heavy quark-antiquark ($q\bar{q}$) pair
using the first-order path integral formalism. This makes the Yang-Mills
constraint equation explicit, and highlights that it is valid without relying
on a semiclassical approximation. A generalized gauge-covariant Coulomb gauge
is chosen to allow for a decomposition of the chromoelectric field into a
gauge-covariant generalization of transverse and longitudinal parts. This
decomposition makes it clear that the $q\bar{q}$ binding energy is determined
solely by the solution to the constraint equation. Assuming that the low-energy
physics is dominated by the existence of a dimension-2 gluon condensate, we
develop an asymptotic series solution to the constraint equation and thus to
the $q\bar{q}$ binding energy. We predict a QCD string tension in terms of the
condensate strength and quadratic Casimir eigenvalues, and relate our result to
results coming from OPE analyses.
| [
{
"created": "Tue, 10 Nov 2020 18:49:36 GMT",
"version": "v1"
}
] | 2020-11-11 | [
[
"Wilson-Gerow",
"Jordan",
""
]
] | We study the binding energy of a heavy quark-antiquark ($q\bar{q}$) pair using the first-order path integral formalism. This makes the Yang-Mills constraint equation explicit, and highlights that it is valid without relying on a semiclassical approximation. A generalized gauge-covariant Coulomb gauge is chosen to allow for a decomposition of the chromoelectric field into a gauge-covariant generalization of transverse and longitudinal parts. This decomposition makes it clear that the $q\bar{q}$ binding energy is determined solely by the solution to the constraint equation. Assuming that the low-energy physics is dominated by the existence of a dimension-2 gluon condensate, we develop an asymptotic series solution to the constraint equation and thus to the $q\bar{q}$ binding energy. We predict a QCD string tension in terms of the condensate strength and quadratic Casimir eigenvalues, and relate our result to results coming from OPE analyses. |
hep-ph/0012078 | Yi Jiang | Wan Lang-Hui, Ma Wen-Gan, Yin Xi, Jiang Yi and Han Liang | Single chargino production via gluon-gluon fusion in a supersymmetric
theory with an explicit R-parity violation | LaTex file, 18 pages, 4 EPS files | J.Phys.G27:203-215,2001 | 10.1088/0954-3899/27/2/306 | null | hep-ph | null | We studied the production of single chargino$\tilde{\chi}_1^{\pm}$
accompanied by $\mu^{\mp}$ lepton via gluon-gluon fusion at the LHC. The
numerical analysis of their production rates is carried out in the mSUGRA
scenario with some typical parameter sets. The results show that the cross
sections of the $\tilde{\chi}_1^{\pm}\mu^{\mp}$ productions via gluon-gluon
collision are in the order of $1 \sim 10^{2}$ femto barn quantitatively at the
CERN LHC, and can be competitive with production mechanism via quark-antiquark
annihilation process.
| [
{
"created": "Thu, 7 Dec 2000 06:52:54 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Lang-Hui",
"Wan",
""
],
[
"Wen-Gan",
"Ma",
""
],
[
"Xi",
"Yin",
""
],
[
"Yi",
"Jiang",
""
],
[
"Liang",
"Han",
""
]
] | We studied the production of single chargino$\tilde{\chi}_1^{\pm}$ accompanied by $\mu^{\mp}$ lepton via gluon-gluon fusion at the LHC. The numerical analysis of their production rates is carried out in the mSUGRA scenario with some typical parameter sets. The results show that the cross sections of the $\tilde{\chi}_1^{\pm}\mu^{\mp}$ productions via gluon-gluon collision are in the order of $1 \sim 10^{2}$ femto barn quantitatively at the CERN LHC, and can be competitive with production mechanism via quark-antiquark annihilation process. |
hep-ph/9512407 | Nikolai Uraltsev | Yu.L. Dokshitzer and N.G. Uraltsev | Are IR Renormalons a Good Probe for the Strong Interaction Domain? | 12 pages, one figure put separately as uuencoded PS file. LaTeX | Phys.Lett. B380 (1996) 141-150 | 10.1016/0370-2693(96)00476-5 | CERN-TH/95-328 | hep-ph | null | We study the origin of non-analyticity in \alpha_s of a short-distance QCD
observable to demonstrate that the infrared renormalons, the same-sign
factorial growth of the perturbative expansion, is a universal phenomenon that
originates entirely from the small coupling domain. In particular, both the
position and the nature of the singularity of the Borel transform of the
perturbative series prove to be independent of whether the running coupling
\alpha(k^2) becomes singular at some finite scale ("Landau pole"), or stays
finite down to k^2=0. We argue that getting hold of the infrared renormalons
per se can help next to nothing in quantifying non-perturbative effects.
| [
{
"created": "Fri, 22 Dec 1995 16:18:22 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Dec 1995 18:36:19 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Dokshitzer",
"Yu. L.",
""
],
[
"Uraltsev",
"N. G.",
""
]
] | We study the origin of non-analyticity in \alpha_s of a short-distance QCD observable to demonstrate that the infrared renormalons, the same-sign factorial growth of the perturbative expansion, is a universal phenomenon that originates entirely from the small coupling domain. In particular, both the position and the nature of the singularity of the Borel transform of the perturbative series prove to be independent of whether the running coupling \alpha(k^2) becomes singular at some finite scale ("Landau pole"), or stays finite down to k^2=0. We argue that getting hold of the infrared renormalons per se can help next to nothing in quantifying non-perturbative effects. |
hep-ph/0412077 | Arkadii Kozhevnikov | N.N.Achasov, A.A. Kozhevnikov | Role of a_1(1260) resonance in multipion decays of light vector mesons | 14 pages, 5 figures | Phys.Rev. D71 (2005) 034015 | 10.1103/PhysRevD.71.034015 | null | hep-ph hep-ex nucl-th | null | The contribution of the a_1(1260) meson to the amplitudes of the decays
rho(770) to 4 pi, omega(782) to 5 pi, and phi(1020) to 5 pi is analyzed in the
chiral model of pseudoscalar, vector, and axial vector mesons based on the
generalized hidden local symmetry added with the anomalous terms. The analysis
shows that inclusion of a_1 meson in the intermediate states results in
enhancement of the branching ratios of the above decays by the factor ranging
from 1.3 to 1.9 depending on the mass of a_1 meson ranging from 1.23 GeV to
m_{a_1}=m_rho sqrt{2}=1.09 GeV, the greater factor standing in case of lower
mass of the a_1.
| [
{
"created": "Mon, 6 Dec 2004 11:50:02 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Feb 2005 07:10:43 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Achasov",
"N. N.",
""
],
[
"Kozhevnikov",
"A. A.",
""
]
] | The contribution of the a_1(1260) meson to the amplitudes of the decays rho(770) to 4 pi, omega(782) to 5 pi, and phi(1020) to 5 pi is analyzed in the chiral model of pseudoscalar, vector, and axial vector mesons based on the generalized hidden local symmetry added with the anomalous terms. The analysis shows that inclusion of a_1 meson in the intermediate states results in enhancement of the branching ratios of the above decays by the factor ranging from 1.3 to 1.9 depending on the mass of a_1 meson ranging from 1.23 GeV to m_{a_1}=m_rho sqrt{2}=1.09 GeV, the greater factor standing in case of lower mass of the a_1. |
0909.3058 | Robert Ziegler | Marco Nardecchia, Andrea Romanino and Robert Ziegler | Tree Level Gauge Mediation | 10 pages, 2 figures, text and references added | JHEP 0911:112,2009 | 10.1088/1126-6708/2009/11/112 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new scheme in which supersymmetry breaking is communicated to
the MSSM sfermions by GUT gauge interactions at the tree level. The (positive)
contribution of MSSM fields to $\text{Str}(\mathcal{M}^2)$ is automatically
compensated by a (negative) contribution from heavy fields. Sfermion masses are
flavour universal, thus solving the supersymmetric flavour problem. In the
simplest SO(10) embedding, the ratio of different sfermion masses is predicted
and differs from mSugra and other schemes, thus making this framework testable
at the LHC. Gaugino masses are generated at the loop level but enhanced by
model dependent factors.
| [
{
"created": "Wed, 16 Sep 2009 19:40:44 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Nov 2009 13:09:05 GMT",
"version": "v2"
}
] | 2009-12-04 | [
[
"Nardecchia",
"Marco",
""
],
[
"Romanino",
"Andrea",
""
],
[
"Ziegler",
"Robert",
""
]
] | We propose a new scheme in which supersymmetry breaking is communicated to the MSSM sfermions by GUT gauge interactions at the tree level. The (positive) contribution of MSSM fields to $\text{Str}(\mathcal{M}^2)$ is automatically compensated by a (negative) contribution from heavy fields. Sfermion masses are flavour universal, thus solving the supersymmetric flavour problem. In the simplest SO(10) embedding, the ratio of different sfermion masses is predicted and differs from mSugra and other schemes, thus making this framework testable at the LHC. Gaugino masses are generated at the loop level but enhanced by model dependent factors. |
hep-ph/0311312 | James Cline | James M. Cline, Sangyong Jeon, Guy D. Moore | The phantom menaced: constraints on low-energy effective ghosts | 4 pages, 2 figures; fixed references. Version to appear in Phys.Rev.D | Phys.Rev. D70 (2004) 043543 | 10.1103/PhysRevD.70.043543 | McGill 03-25 | hep-ph astro-ph hep-th | null | It has been suggested that a scalar field with negative kinetic energy, or
``ghost,'' could be the source of the observed late-time cosmological
acceleration. Naively, such theories should be ruled out by the catastrophic
quantum instability of the vacuum. We derive phenomenological bounds on the
Lorentz-violating ultraviolet cutoff Lambda which must apply to low-energy
effective theories of ghosts, in order to keep the instability at unobservable
levels. Assuming only that ghosts interact at least gravitationally, we show
that Lambda < 3 MeV for consistency with the cosmic gamma ray background. We
also show that theories of ghosts with a Lorentz-conserving cutoff are
completely excluded.
| [
{
"created": "Mon, 24 Nov 2003 20:57:26 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Nov 2003 21:29:13 GMT",
"version": "v2"
},
{
"created": "Tue, 27 Apr 2004 17:01:22 GMT",
"version": "v3"
},
{
"created": "Wed, 28 Apr 2004 15:24:35 GMT",
"version": "v4"
}
] | 2009-11-10 | [
[
"Cline",
"James M.",
""
],
[
"Jeon",
"Sangyong",
""
],
[
"Moore",
"Guy D.",
""
]
] | It has been suggested that a scalar field with negative kinetic energy, or ``ghost,'' could be the source of the observed late-time cosmological acceleration. Naively, such theories should be ruled out by the catastrophic quantum instability of the vacuum. We derive phenomenological bounds on the Lorentz-violating ultraviolet cutoff Lambda which must apply to low-energy effective theories of ghosts, in order to keep the instability at unobservable levels. Assuming only that ghosts interact at least gravitationally, we show that Lambda < 3 MeV for consistency with the cosmic gamma ray background. We also show that theories of ghosts with a Lorentz-conserving cutoff are completely excluded. |
hep-ph/0009281 | null | Chueng-Ryong Ji (NCSU) and Ho-Meoyng Choi (CMU) | New effective treatment of the light-front nonvalence contribution in
timelike exclusive processes | 10 pages including 5 figures; Changes: 1-added some sentences;
2-enlarged the figures; 3-added some references | Phys.Lett. B513 (2001) 330 | 10.1016/S0370-2693(01)00481-6 | null | hep-ph | null | We discuss a necessary nonvalence contribution in timelike exclusive
processes. Following a Schwinger-Dyson type of approach, we relate the
nonvalence contribution to an ordinary light-front wave function that has been
extensively tested in the spacelike exclusive processes. A complicate four-body
energy denominator is exactly cancelled in summing the light-front time-ordered
amplitudes. Applying our method to $K_{\ell3}$ and $D^0\to K^- \ell^+ \nu_l$
where a rather substantial nonvalence contribution is expected, we find not
only an improvement in comparing with the experimental data but also a
covariance(i.e. frame-independence) of existing light-front constituent quark
model.
| [
{
"created": "Sun, 24 Sep 2000 22:10:35 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Dec 2000 22:40:07 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Feb 2001 20:53:36 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Ji",
"Chueng-Ryong",
"",
"NCSU"
],
[
"Choi",
"Ho-Meoyng",
"",
"CMU"
]
] | We discuss a necessary nonvalence contribution in timelike exclusive processes. Following a Schwinger-Dyson type of approach, we relate the nonvalence contribution to an ordinary light-front wave function that has been extensively tested in the spacelike exclusive processes. A complicate four-body energy denominator is exactly cancelled in summing the light-front time-ordered amplitudes. Applying our method to $K_{\ell3}$ and $D^0\to K^- \ell^+ \nu_l$ where a rather substantial nonvalence contribution is expected, we find not only an improvement in comparing with the experimental data but also a covariance(i.e. frame-independence) of existing light-front constituent quark model. |
hep-ph/0202049 | Wei Min Yang | Wei Min Yang and Dong Sheng Du | CP Asymmetry in Tau Slepton Decay in The Minimal Supersymmetric Standard
Model | 18 pages, 7figures, LaTex2e | Phys.Rev. D65 (2002) 115005 | 10.1103/PhysRevD.65.115005 | null | hep-ph | null | We investigate CP violation asymmetry in the decay of tau slepton into a tau
neutrino and a chargino in the minimal supersymmetric standard model. The new
source of CP violation is the complex mixing in the tau slepton sector. The
rate asymmetry between the decays of tau slepton and its CP conjugate process
can be of order of $10^{-3}$ in some region of the parameter space of the
mSUGRA scenario, which will possibly be detectable in the near-future collider
experiments.
| [
{
"created": "Wed, 6 Feb 2002 14:41:01 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Yang",
"Wei Min",
""
],
[
"Du",
"Dong Sheng",
""
]
] | We investigate CP violation asymmetry in the decay of tau slepton into a tau neutrino and a chargino in the minimal supersymmetric standard model. The new source of CP violation is the complex mixing in the tau slepton sector. The rate asymmetry between the decays of tau slepton and its CP conjugate process can be of order of $10^{-3}$ in some region of the parameter space of the mSUGRA scenario, which will possibly be detectable in the near-future collider experiments. |
2306.02735 | Carsten M\"uller | N. Mahlin, S. Villalba-Ch\'avez and C. M\"uller | Dynamically-assisted nonlinear Breit-Wheeler pair production in
bichromatic laser fields of circular polarization | 11 pages, 7 figures | null | null | null | hep-ph physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Production of electron-positron pairs by a high-energy $\gamma$ photon and a
bichromatic laser wave is considered where the latter is composed of a strong
low-frequency and a weak high-frequency component, both with circular
polarization. An integral expression for the production rate is derived that
accounts for the strong laser mode to all orders and for the weak laser mode to
first order. The structure of this formula resembles the well-known expression
for the nonlinear Breit-Wheeler process in a strong laser field, but includes
the dynamical assistance from the weak laser mode. We analyze the dependence of
the dynamical rate enhancement on the applied field parameters and show, in
particular, that it is substantially higher when the two laser modes have
opposite helicity.
| [
{
"created": "Mon, 5 Jun 2023 09:31:12 GMT",
"version": "v1"
}
] | 2023-06-06 | [
[
"Mahlin",
"N.",
""
],
[
"Villalba-Chávez",
"S.",
""
],
[
"Müller",
"C.",
""
]
] | Production of electron-positron pairs by a high-energy $\gamma$ photon and a bichromatic laser wave is considered where the latter is composed of a strong low-frequency and a weak high-frequency component, both with circular polarization. An integral expression for the production rate is derived that accounts for the strong laser mode to all orders and for the weak laser mode to first order. The structure of this formula resembles the well-known expression for the nonlinear Breit-Wheeler process in a strong laser field, but includes the dynamical assistance from the weak laser mode. We analyze the dependence of the dynamical rate enhancement on the applied field parameters and show, in particular, that it is substantially higher when the two laser modes have opposite helicity. |
2304.09473 | Luca Maxia | Dani\"el Boer, Jelle Bor, Luca Maxia, Cristian Pisano, Feng Yuan | Transverse momentum dependent shape function for $J/\psi$ production in
SIDIS | 18 pages, 2 figures, final version published in JHEP | J. High Energ. Phys. 2023, 105 (2023) | 10.1007/JHEP08(2023)105 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been shown previously that the transverse momentum dependent (TMD)
factorization of heavy quarkonium production requires a TMD shape function. Its
perturbative tail can be extracted by matching the cross sections valid at low
and high transverse momenta. In this article we compare the order-$\alpha_s$
TMD expressions with the order-$\alpha_s^2$ collinear ones for $J/\psi$
production in semi-inclusive deep inelastic scattering (SIDIS), employing
nonrelativistic QCD in both cases. In contrast to previous studies, we find
that the small transverse momentum limit of the collinear expressions contain
discontinuities. We demonstrate how to properly deal with them and include
their finite contributions to the TMD shape functions. Moreover, we show that
soft gluon emission from the low transverse momentum Born diagrams provide the
same leading order TMD shape functions as required for the matching. Their
revised perturbative tails have a less divergent behaviour as compared to the
TMD fragmentation functions of light hadrons. Finally, we investigate the
universality of TMD shape functions in heavy quarkonium production, identify
the need for process dependent factorization and discuss the phenomenological
implications.
| [
{
"created": "Wed, 19 Apr 2023 07:42:25 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Sep 2023 07:37:22 GMT",
"version": "v2"
}
] | 2023-09-07 | [
[
"Boer",
"Daniël",
""
],
[
"Bor",
"Jelle",
""
],
[
"Maxia",
"Luca",
""
],
[
"Pisano",
"Cristian",
""
],
[
"Yuan",
"Feng",
""
]
] | It has been shown previously that the transverse momentum dependent (TMD) factorization of heavy quarkonium production requires a TMD shape function. Its perturbative tail can be extracted by matching the cross sections valid at low and high transverse momenta. In this article we compare the order-$\alpha_s$ TMD expressions with the order-$\alpha_s^2$ collinear ones for $J/\psi$ production in semi-inclusive deep inelastic scattering (SIDIS), employing nonrelativistic QCD in both cases. In contrast to previous studies, we find that the small transverse momentum limit of the collinear expressions contain discontinuities. We demonstrate how to properly deal with them and include their finite contributions to the TMD shape functions. Moreover, we show that soft gluon emission from the low transverse momentum Born diagrams provide the same leading order TMD shape functions as required for the matching. Their revised perturbative tails have a less divergent behaviour as compared to the TMD fragmentation functions of light hadrons. Finally, we investigate the universality of TMD shape functions in heavy quarkonium production, identify the need for process dependent factorization and discuss the phenomenological implications. |
hep-ph/9702405 | Zygmunt Lalak | Zygmunt Lalak (ITP, University of Warsaw) | Towards a Solution of the Cosmological Domain Walls Problem | 5 pages, Latex, uses stwol.sty (included), 2 figures. Talk given at
International Conference on High Energy Physics (ICHEP), Warsaw, July 1996,
published in proceedings | null | null | null | hep-ph | null | We show that all kinds of biasing of cosmological phase transitions produce
qualitatively new type of domain wall networks. The biased networks consist of
compact, finite size, bag-like wall structures and exhibit a generic
instability. The surface of biased networks disappears exponentially fast after
a limited period of scaling. We argue that fluctuations of the background make
the network unstable even in the case of the ``symmetric on the average''
initial distribution. We observe that the variation in parameters of the
potential, like its hight, can influence the lifetime of the wall network,
contrary to the standard beliefs.
| [
{
"created": "Sun, 23 Feb 1997 23:45:38 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lalak",
"Zygmunt",
"",
"ITP, University of Warsaw"
]
] | We show that all kinds of biasing of cosmological phase transitions produce qualitatively new type of domain wall networks. The biased networks consist of compact, finite size, bag-like wall structures and exhibit a generic instability. The surface of biased networks disappears exponentially fast after a limited period of scaling. We argue that fluctuations of the background make the network unstable even in the case of the ``symmetric on the average'' initial distribution. We observe that the variation in parameters of the potential, like its hight, can influence the lifetime of the wall network, contrary to the standard beliefs. |
0806.3190 | Roman Nevzorov | C. D. Froggatt, R. Nevzorov, H. B. Nielsen, D. Thompson | On the origin of approximate custodial symmetry in the Two-Higgs Doublet
Model | 59 pages, 8 figures, version to be published in IJMPA | Int.J.Mod.Phys.A24:5587-5637,2009 | 10.1142/S0217751X09047442 | CERN-PH-TH/2008-058 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that the consistent implementation of the multiple point principle
(MPP) in the general non-supersymmetric two Higgs doublet model (2HDM) can lead
to a set of approximate global custodial symmetries that ensure CP conservation
in the Higgs sector and the absence of flavour changing neutral currents (FCNC)
in the considered model. In particular the existence of a large set of
degenerate vacua at some high energy scale $\Lambda$ caused by the MPP can
result in approximate U(1) and Z(2) symmetries that suppress FCNC and
CP--violating interactions in the 2HDM. We explore the renormalisation group
(RG) flow of the Yukawa and Higgs couplings within the MPP inspired 2HDM with
approximate custodial symmetries and show that the solutions of the RG
equations are focused near quasi--fixed points at low energies if the MPP scale
scale $\Lambda$ is relatively high. We study the Higgs spectrum and couplings
near the quasi--fixed point at moderate values of $\tan\beta$ and compute a
theoretical upper bound on the lightest Higgs boson mass. If $\Lambda\gtrsim
10^{10} {GeV}$ the lightest CP--even Higgs boson is always lighter than $125
{GeV}$. When the MPP scale is low, the mass of the lightest Higgs particle can
reach $180-220 {GeV}$ while its coupling to the top quark can be significantly
larger than in the SM, resulting in the enhanced production of Higgs bosons at
the LHC.
| [
{
"created": "Thu, 19 Jun 2008 13:46:11 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Oct 2008 16:53:37 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Oct 2009 02:24:04 GMT",
"version": "v3"
}
] | 2010-01-07 | [
[
"Froggatt",
"C. D.",
""
],
[
"Nevzorov",
"R.",
""
],
[
"Nielsen",
"H. B.",
""
],
[
"Thompson",
"D.",
""
]
] | We argue that the consistent implementation of the multiple point principle (MPP) in the general non-supersymmetric two Higgs doublet model (2HDM) can lead to a set of approximate global custodial symmetries that ensure CP conservation in the Higgs sector and the absence of flavour changing neutral currents (FCNC) in the considered model. In particular the existence of a large set of degenerate vacua at some high energy scale $\Lambda$ caused by the MPP can result in approximate U(1) and Z(2) symmetries that suppress FCNC and CP--violating interactions in the 2HDM. We explore the renormalisation group (RG) flow of the Yukawa and Higgs couplings within the MPP inspired 2HDM with approximate custodial symmetries and show that the solutions of the RG equations are focused near quasi--fixed points at low energies if the MPP scale scale $\Lambda$ is relatively high. We study the Higgs spectrum and couplings near the quasi--fixed point at moderate values of $\tan\beta$ and compute a theoretical upper bound on the lightest Higgs boson mass. If $\Lambda\gtrsim 10^{10} {GeV}$ the lightest CP--even Higgs boson is always lighter than $125 {GeV}$. When the MPP scale is low, the mass of the lightest Higgs particle can reach $180-220 {GeV}$ while its coupling to the top quark can be significantly larger than in the SM, resulting in the enhanced production of Higgs bosons at the LHC. |
1304.5171 | Sho Iwamoto | Sho Iwamoto | LHC SUSY searches after the Higgs discovery: respecting the muon g-2 | 6 pages, 2 figures; Proceeding for HPNP 2013, Toyama, Feb. 2013;
based on arXiv:1303.4256. References added for v2/v3 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | SUSY searches at the LHC as well as the 126 GeV Higgs boson indicate that
superparticles, especially squarks and gluinos, are not so light as we
expected. It is important to investigate SUSY searches which do not rely on the
colored superparticles.
As a clue for the investigation, we focus on the muon g-2 anomaly, which can
be explained by the SUSY contributions if some of neutralinos, charginos, and
sleptons are as light as of order 100 GeV. We propose the muon-(g-2)-motivated
MSSM as a benchmark model, where squarks are decoupled but the superparticles
corresponding to the muon g-2 are light enough to explain the anomaly. We also
interpret the up-to-date results of LHC SUSY searches, and obtain experimental
constraints on the model.
We show searches for direct production of charginos and neutralinos work very
well against the scenario, but several regions are not only remain uncovered
but even found challenging to be searched for at the LHC. It is ascertained
that, in order to draw out latent potential of the LHC, strategies to attack
these regions should be developed.
| [
{
"created": "Thu, 18 Apr 2013 16:01:44 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Apr 2013 10:38:35 GMT",
"version": "v2"
},
{
"created": "Fri, 3 May 2013 12:00:56 GMT",
"version": "v3"
}
] | 2013-05-06 | [
[
"Iwamoto",
"Sho",
""
]
] | SUSY searches at the LHC as well as the 126 GeV Higgs boson indicate that superparticles, especially squarks and gluinos, are not so light as we expected. It is important to investigate SUSY searches which do not rely on the colored superparticles. As a clue for the investigation, we focus on the muon g-2 anomaly, which can be explained by the SUSY contributions if some of neutralinos, charginos, and sleptons are as light as of order 100 GeV. We propose the muon-(g-2)-motivated MSSM as a benchmark model, where squarks are decoupled but the superparticles corresponding to the muon g-2 are light enough to explain the anomaly. We also interpret the up-to-date results of LHC SUSY searches, and obtain experimental constraints on the model. We show searches for direct production of charginos and neutralinos work very well against the scenario, but several regions are not only remain uncovered but even found challenging to be searched for at the LHC. It is ascertained that, in order to draw out latent potential of the LHC, strategies to attack these regions should be developed. |
1711.02633 | Taoli Cheng | Taoli Cheng | Recursive Neural Networks in Quark/Gluon Tagging | 14 pages, 9 figures, 4 tables; matches to the version published in
Computing and Software for Big Science | Comput Softw Big Sci (2018) 2: 3 | 10.1007/s41781-018-0007-y | null | hep-ph hep-ex stat.ML | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Since the machine learning techniques are improving rapidly, it has been
shown that the image recognition techniques in deep neural networks can be used
to detect jet substructure. And it turns out that deep neural networks can
match or outperform traditional approach of expert features. However, there are
disadvantages such as sparseness of jet images. Based on the natural tree-like
structure of jet sequential clustering, the recursive neural networks (RecNNs),
which embed jet clustering history recursively as in natural language
processing, have a better behavior when confronted with these problems. We thus
try to explore the performance of RecNNs in quark/gluon discrimination. The
results show that RecNNs work better than the baseline boosted decision tree
(BDT) by a few percent in gluon rejection rate. However, extra implementation
of particle flow identification only increases the performance slightly. We
also experimented on some relevant aspects which might influence the
performance of the networks. It shows that even taking only particle flow
identification as input feature without any extra information on momentum or
angular position is already giving a fairly good result, which indicates that
the most of the information for quark/gluon discrimination is already included
in the tree-structure itself. As a bonus, a rough up/down quark jets
discrimination is also explored.
| [
{
"created": "Tue, 7 Nov 2017 17:54:43 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jun 2018 17:14:47 GMT",
"version": "v2"
}
] | 2018-07-02 | [
[
"Cheng",
"Taoli",
""
]
] | Since the machine learning techniques are improving rapidly, it has been shown that the image recognition techniques in deep neural networks can be used to detect jet substructure. And it turns out that deep neural networks can match or outperform traditional approach of expert features. However, there are disadvantages such as sparseness of jet images. Based on the natural tree-like structure of jet sequential clustering, the recursive neural networks (RecNNs), which embed jet clustering history recursively as in natural language processing, have a better behavior when confronted with these problems. We thus try to explore the performance of RecNNs in quark/gluon discrimination. The results show that RecNNs work better than the baseline boosted decision tree (BDT) by a few percent in gluon rejection rate. However, extra implementation of particle flow identification only increases the performance slightly. We also experimented on some relevant aspects which might influence the performance of the networks. It shows that even taking only particle flow identification as input feature without any extra information on momentum or angular position is already giving a fairly good result, which indicates that the most of the information for quark/gluon discrimination is already included in the tree-structure itself. As a bonus, a rough up/down quark jets discrimination is also explored. |
hep-ph/9906320 | Gerrit Schierholz | S. Capitani, M. G\"ockeler, R. Horsley, D. Petters, D. Pleiter, P.
Rakow and G. Schierholz | Higher-twist corrections to nucleon structure functions from lattice QCD | Talk given by G. Schierholz at DIS99, April 19 - 23, 1999, Zeuthen,
Germany | Nucl.Phys.Proc.Suppl.79:173-175,1999 | 10.1016/S0920-5632(99)00666-0 | DESY 99-069, HUB-EP-99/25, HLRZ 1999-21 | hep-ph hep-lat | null | A genuinely non-perturbative evaluation of higher-twist contributions to the
structure functions of the nucleon, with all mixing effects and renormalon
ambiguities taken care of, is presented. Higher-twist corrections turn out to
be significant at moderate values of $q^2$.
| [
{
"created": "Thu, 10 Jun 1999 14:05:24 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Capitani",
"S.",
""
],
[
"Göckeler",
"M.",
""
],
[
"Horsley",
"R.",
""
],
[
"Petters",
"D.",
""
],
[
"Pleiter",
"D.",
""
],
[
"Rakow",
"P.",
""
],
[
"Schierholz",
"G.",
""
]
] | A genuinely non-perturbative evaluation of higher-twist contributions to the structure functions of the nucleon, with all mixing effects and renormalon ambiguities taken care of, is presented. Higher-twist corrections turn out to be significant at moderate values of $q^2$. |
1108.0978 | Ji-Haeng Huh | David G. Cerdeno, Ji-Haeng Huh, Miguel Peiro, Osamu Seto | Very light right-handed sneutrino dark matter in the NMSSM | 57 pages, 24 figures. Minor changes, reanalysis of some examples.
Final version to appear in JCAP | Journal of Cosmology and Astroparticle Physics 11 (2011) 027 | 10.1088/1475-7516/2011/11/027 | FTUAM 11/54; IFT-UAM/CSIC-11-58; HGU-CAP 12 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Very light right-handed (RH) sneutrinos in the Next-to-Minimal Supersymmetric
Standard Model can be viable candidates for cold dark matter. We investigate
the prospects for their direct detection, addressing their compatibility with
the recent signal observed by the CoGeNT detector, and study the implications
for Higgs phenomenology. We find that in order to reproduce the correct relic
abundance very light RH sneutrinos can annihilate into either a
fermion-antifermion pair, very light pseudoscalar Higgses or RH neutrinos. If
the main annihilation channel is into fermions, we point out that RH sneutrinos
could naturally account for the CoGeNT signal. Furthermore, the lightest Higgs
has a very large invisible decay width, and in some cases the second-lightest
Higgs too. On the other hand, if the RH sneutrino annihilates mostly into
pseudoscalars or RH neutrinos the predictions for direct detection are below
the current experimental sensitivities and satisfy the constraints set by CDMS
and XENON. We also calculate the gamma ray flux from RH sneutrino annihilation
in the Galactic centre, including as an interesting new possibility RH
neutrinos in the final state. These are produced through a resonance with the
Higgs and the resulting flux can exhibit a significant Breit-Wigner
enhancement.
| [
{
"created": "Thu, 4 Aug 2011 01:43:17 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Sep 2011 15:15:36 GMT",
"version": "v2"
},
{
"created": "Tue, 20 Dec 2011 13:31:05 GMT",
"version": "v3"
}
] | 2011-12-21 | [
[
"Cerdeno",
"David G.",
""
],
[
"Huh",
"Ji-Haeng",
""
],
[
"Peiro",
"Miguel",
""
],
[
"Seto",
"Osamu",
""
]
] | Very light right-handed (RH) sneutrinos in the Next-to-Minimal Supersymmetric Standard Model can be viable candidates for cold dark matter. We investigate the prospects for their direct detection, addressing their compatibility with the recent signal observed by the CoGeNT detector, and study the implications for Higgs phenomenology. We find that in order to reproduce the correct relic abundance very light RH sneutrinos can annihilate into either a fermion-antifermion pair, very light pseudoscalar Higgses or RH neutrinos. If the main annihilation channel is into fermions, we point out that RH sneutrinos could naturally account for the CoGeNT signal. Furthermore, the lightest Higgs has a very large invisible decay width, and in some cases the second-lightest Higgs too. On the other hand, if the RH sneutrino annihilates mostly into pseudoscalars or RH neutrinos the predictions for direct detection are below the current experimental sensitivities and satisfy the constraints set by CDMS and XENON. We also calculate the gamma ray flux from RH sneutrino annihilation in the Galactic centre, including as an interesting new possibility RH neutrinos in the final state. These are produced through a resonance with the Higgs and the resulting flux can exhibit a significant Breit-Wigner enhancement. |
1105.1925 | Gilbert Moultaka | A. Arhrib, R. Benbrik, M. Chabab, G. Moultaka, M.C. Peyranere, L.
Rahili, J.Ramadan | The Higgs Potential in the Type II Seesaw Model | 55 pages, 9 figures, no major changes, references added, a comment
added to sec 3.1, typos corrected | null | 10.1103/PhysRevD.84.095005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform in the type II seesaw setting, a detailed study of the dynamical
features of the corresponding general renormalizable doublet/triplet Higgs
potential that depends on five dimensionless couplings and two mass parameters
after spontaneous symmetry breaking, and highlight the implications for the
Higgs phenomenology. In particular, we determine i) the complete set of
tree-level unitarity constraints on the couplings of the potential and ii) the
exact tree-level {\sl all directions} boundedness from below constraints on
these couplings. When combined, these constraints delineate precisely the
theoretically allowed parameter space domain within our perturbative
approximation. Among the seven physical Higgs states of this model, the mass of
the lighter (heavier) CP-even state h0 (H0) will always satisfy a theoretical
upper (lower) bound that is reached for a critical value mu_c of mu (the mass
parameter controlling triple couplings among the doublet/triplet Higgses).
Saturating the unitarity bounds we find m_h0 < {\cal O}(0.7 - 1 TeV), while the
upper bound for the remaining Higgses lies in the several tens of TeV. However,
the actual masses can be much lighter. We identify two regimes corresponding to
mu > mu_c and mu < mu_c. In the first regime the Higgs sector is typically very
heavy and only h0 that becomes SM-like could be accessible to the LHC. In
contrast, in the second regime, somewhat overlooked in the literature, most of
the Higgs sector is light. In particular the heaviest state H0 becomes SM-like,
the lighter states being the CP-odd Higgs, the (doubly) charged Higgses and a
decoupled h0, possibly leading to a distinctive phenomenology at the colliders.
| [
{
"created": "Tue, 10 May 2011 12:10:37 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Jul 2011 15:58:21 GMT",
"version": "v2"
}
] | 2013-05-29 | [
[
"Arhrib",
"A.",
""
],
[
"Benbrik",
"R.",
""
],
[
"Chabab",
"M.",
""
],
[
"Moultaka",
"G.",
""
],
[
"Peyranere",
"M. C.",
""
],
[
"Rahili",
"L.",
""
],
[
"Ramadan",
"J.",
""
]
] | We perform in the type II seesaw setting, a detailed study of the dynamical features of the corresponding general renormalizable doublet/triplet Higgs potential that depends on five dimensionless couplings and two mass parameters after spontaneous symmetry breaking, and highlight the implications for the Higgs phenomenology. In particular, we determine i) the complete set of tree-level unitarity constraints on the couplings of the potential and ii) the exact tree-level {\sl all directions} boundedness from below constraints on these couplings. When combined, these constraints delineate precisely the theoretically allowed parameter space domain within our perturbative approximation. Among the seven physical Higgs states of this model, the mass of the lighter (heavier) CP-even state h0 (H0) will always satisfy a theoretical upper (lower) bound that is reached for a critical value mu_c of mu (the mass parameter controlling triple couplings among the doublet/triplet Higgses). Saturating the unitarity bounds we find m_h0 < {\cal O}(0.7 - 1 TeV), while the upper bound for the remaining Higgses lies in the several tens of TeV. However, the actual masses can be much lighter. We identify two regimes corresponding to mu > mu_c and mu < mu_c. In the first regime the Higgs sector is typically very heavy and only h0 that becomes SM-like could be accessible to the LHC. In contrast, in the second regime, somewhat overlooked in the literature, most of the Higgs sector is light. In particular the heaviest state H0 becomes SM-like, the lighter states being the CP-odd Higgs, the (doubly) charged Higgses and a decoupled h0, possibly leading to a distinctive phenomenology at the colliders. |
hep-ph/9805232 | null | K.G. Chetyrkin, A. Kwiatkowski | Mass Corrections to the Tau Decay Rate | 13 pages, LaTeX, no figures. This version fixes a typo in eq. (25) of
the original paper (Z. Phys. C59 (1993) 525) and an errror in a numerical
integration procedure which has resulted to a significant increase of the
O(\alpha_s^2) coefficient in eq. (27). As a consequence also some tables in
Section 4 have been modified | Z.Phys. C59 (1993) 525-532 | 10.1007/BF01498634 | TTP93-9 | hep-ph | null | In this note radiative corrections to the total hadronic decay rate of the
$\tau$-lepton are studied employing perturbative QCD and the operator product
expansion. We calculate quadratic quark mass corrections to the decay rate
ration $R_{\tau}$ to the order ${\cal O}(\alpha_s^2 m^2)$ and find that they
contribute appreciably to the Cabbibo supressed decay modes of the
$\tau$-lepton. We also discuss corrections of mass dimension D=4, where we
emphasize the need of a suitable choice of the renormalization scale of the
quark and gluon condensates.
| [
{
"created": "Wed, 6 May 1998 09:57:10 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Chetyrkin",
"K. G.",
""
],
[
"Kwiatkowski",
"A.",
""
]
] | In this note radiative corrections to the total hadronic decay rate of the $\tau$-lepton are studied employing perturbative QCD and the operator product expansion. We calculate quadratic quark mass corrections to the decay rate ration $R_{\tau}$ to the order ${\cal O}(\alpha_s^2 m^2)$ and find that they contribute appreciably to the Cabbibo supressed decay modes of the $\tau$-lepton. We also discuss corrections of mass dimension D=4, where we emphasize the need of a suitable choice of the renormalization scale of the quark and gluon condensates. |
hep-ph/0504118 | Thomas G. Rizzo | Thomas G. Rizzo | Collider Signatures of Higher Curvature Gravity | 6 pages, 6 figs; talk given at LCWS05, Stanford University, 18-22
March 2005 | null | null | SLAC-PUB-11036 | hep-ph | null | We explore the phenomenological implications at colliders for the existence
of higher-curvature gravity as extensions to both the Randall-Sundrum(RS) and
Arkani-Hamed, Dimopoulos and Dvali(ADD) scenarios. Such terms are expected to
arise on rather general grounds from ultraviolet completions of General
Relativity, e.g., from string theory. In the Randall-Sundrum model these terms
shift the mass spectrum and couplings of the graviton tower. In the case of ADD
they can lead to a threshold for the production of long-lived black holes.
| [
{
"created": "Thu, 14 Apr 2005 17:47:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rizzo",
"Thomas G.",
""
]
] | We explore the phenomenological implications at colliders for the existence of higher-curvature gravity as extensions to both the Randall-Sundrum(RS) and Arkani-Hamed, Dimopoulos and Dvali(ADD) scenarios. Such terms are expected to arise on rather general grounds from ultraviolet completions of General Relativity, e.g., from string theory. In the Randall-Sundrum model these terms shift the mass spectrum and couplings of the graviton tower. In the case of ADD they can lead to a threshold for the production of long-lived black holes. |
hep-ph/0005169 | Carl E. Carlson | Carl E. Carlson (W & M) | What we know about the Theoretical Foundation of Duality in Electron
Scattering | 8 pages, 5 figures, invited talk at N*2000 conference, dedicated to
Nimai Mukhopadhyay | null | null | WM-00-106 | hep-ph | null | We consider some of the things that we understand about the theoretical
underpinnings of duality, including items such as why the resonance
peak/background ratio is constant in general, why it falls for the
$\Delta(1232)$, what we might expect for scaling and duality with longitudinal
or spin-dependent structure functions, and what kind of scaling or duality we
might expect for semiexclusive processes.
| [
{
"created": "Wed, 17 May 2000 14:51:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Carlson",
"Carl E.",
"",
"W & M"
]
] | We consider some of the things that we understand about the theoretical underpinnings of duality, including items such as why the resonance peak/background ratio is constant in general, why it falls for the $\Delta(1232)$, what we might expect for scaling and duality with longitudinal or spin-dependent structure functions, and what kind of scaling or duality we might expect for semiexclusive processes. |
hep-ph/9408340 | Hans-Guenter Kohrs | B.A. Kniehl, H.-G. Kohrs and G. Kramer | Diffractive Photoproduction of Jets with a Direct Pomeron Coupling at
HERA | 21 pages, Latex file, 7 figures (uuencoded) enclosed, Preprint DESY
94-140, KEK-TH-407 and KEK Preprint 94-77 | Z.Phys.C65:657-666,1995 | 10.1007/BF01578673 | null | hep-ph | null | We investigate in detail the effect of a direct pomeron coupling to quarks on
the production of jets in $ep$ scattering with almost real photons. Jet
production via a direct pomeron coupling is compared with the resolved--pomeron
mechanism. We consider both direct and resolved photoproduction. Rapidity and
transverse momentum distributions are calculated and compared with preliminary
H1 and ZEUS data.
| [
{
"created": "Mon, 22 Aug 1994 13:43:40 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Kniehl",
"B. A.",
""
],
[
"Kohrs",
"H. -G.",
""
],
[
"Kramer",
"G.",
""
]
] | We investigate in detail the effect of a direct pomeron coupling to quarks on the production of jets in $ep$ scattering with almost real photons. Jet production via a direct pomeron coupling is compared with the resolved--pomeron mechanism. We consider both direct and resolved photoproduction. Rapidity and transverse momentum distributions are calculated and compared with preliminary H1 and ZEUS data. |
hep-ph/0004098 | Pran Nath | Tarek Ibrahim and Pran Nath | Effects of Large CP Phases on the Proton Lifetime in Supersymmetric
Unification | Revised version with minor changes to appear in Physical Review D; 21
pages, Latex including 6 figures | Phys.Rev.D62:095001,2000 | 10.1103/PhysRevD.62.095001 | null | hep-ph | null | The effects of large CP violating phases arising from the soft SUSY breaking
parameters on the proton lifetime are investigated in supersymmetric grand
unified models. It is found that the CP violating phases can reduce as well as
enhance the proton lifetime depending on the part of the parameter space one is
in. Modifications of the proton lifetime by as much as a factor of 2 due to the
effects of the CP violating phases are seen. The largest effects arise for the
lightest sparticle spectrum in the dressing loop integrals and the effects
decrease with the increasing scale of the sparticle masses. An analysis of the
uncertainties in the determination of the proton life time due to uncertainties
in the quark masses and in the other input data is also given. These results
are of import in the precision predictions of the proton lifetime in
supersymmetric unification both in GUT and in string models when the soft SUSY
breaking parameters are complex.
| [
{
"created": "Mon, 10 Apr 2000 21:44:49 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Sep 2000 17:05:47 GMT",
"version": "v2"
}
] | 2011-06-10 | [
[
"Ibrahim",
"Tarek",
""
],
[
"Nath",
"Pran",
""
]
] | The effects of large CP violating phases arising from the soft SUSY breaking parameters on the proton lifetime are investigated in supersymmetric grand unified models. It is found that the CP violating phases can reduce as well as enhance the proton lifetime depending on the part of the parameter space one is in. Modifications of the proton lifetime by as much as a factor of 2 due to the effects of the CP violating phases are seen. The largest effects arise for the lightest sparticle spectrum in the dressing loop integrals and the effects decrease with the increasing scale of the sparticle masses. An analysis of the uncertainties in the determination of the proton life time due to uncertainties in the quark masses and in the other input data is also given. These results are of import in the precision predictions of the proton lifetime in supersymmetric unification both in GUT and in string models when the soft SUSY breaking parameters are complex. |
0910.4920 | Simona Malace | S. P. Malace, Y. Kahn, W. Melnitchouk, C. E. Keppel | Confirmation of quark-hadron duality in the neutron F_2 structure
function | 4 pages, 4 figures; minor content changes; to appear in Phys. Rev.
Lett | Phys.Rev.Lett.104:102001,2010 | 10.1103/PhysRevLett.104.102001 | JLAB-THY-09-1096 | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply a recently developed technique to extract for the first time the
neutron F_2^n structure function from inclusive proton and deuteron data in the
nucleon resonance region, and test the validity of quark-hadron duality in the
neutron. We establish the accuracy of duality in the low-lying neutron
resonance regions over a range of Q^2, and compare with the corresponding
results on the proton and with theoretical expectations. The confirmation of
duality in both the neutron and proton opens the possibility of using resonance
region data to constrain parton distributions at large x.
| [
{
"created": "Mon, 26 Oct 2009 16:22:10 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Feb 2010 18:49:06 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Malace",
"S. P.",
""
],
[
"Kahn",
"Y.",
""
],
[
"Melnitchouk",
"W.",
""
],
[
"Keppel",
"C. E.",
""
]
] | We apply a recently developed technique to extract for the first time the neutron F_2^n structure function from inclusive proton and deuteron data in the nucleon resonance region, and test the validity of quark-hadron duality in the neutron. We establish the accuracy of duality in the low-lying neutron resonance regions over a range of Q^2, and compare with the corresponding results on the proton and with theoretical expectations. The confirmation of duality in both the neutron and proton opens the possibility of using resonance region data to constrain parton distributions at large x. |
2301.07070 | Chun-Wei Su | Chuan-Hung Chen, Cheng-Wei Chiang, Chun-Wei Su | Top-quark FCNC decays, LFVs, lepton $g-2$, and $W$ mass anomaly with
inert charged Higgses | 35 pages, 10 figures, typos corrected and references added | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observed flavor-changing neutral-current (FCNC) processes in the standard
model (SM) arise from the loop diagrams involving the weak charged currents
mediated by the $W$-gauge boson. Nevertheless, the top-quark FCNCs and
lepton-flavor violating processes resulting from the same mechanism are highly
suppressed. We investigate possible new physics effects that can enhance the
suppressed FCNC processes, such as $t\to q(h,V)$ with $V=\gamma,Z,g$, $h\to
\ell \ell'$, and $\ell\to \ell' \gamma$. To achieve the assumption that the
induced-FCNCs are all from quantum loops, we consider the scotogenic mechanism,
where a $Z_2$ symmetry is introduced and only new particles carry an odd $Z_2$
parity. With the extension of the SM to include an inert Higgs doublet, an
inert charged Higgs singlet, a vector-like singlet quark, and two neutral
leptons, it is found that, with relevant constraints taken into account, the
$t\to c (h, Z)$, $h\to \mu\tau$, and $\tau\to \ell \gamma$ decays can be
enhanced up to the expected sensitivities in experiments. The branching ratios
of $h\to \mu^+ \mu^-/\tau^+ \tau^-$ from only new physics effects can reach up
to ${\cal O}(10^{-3})$. Intriguingly, the resulting muon $g-2$ can fit the
combined data within $2\sigma$ errors, whereas the electron $g-2$ can have
either sign with a magnitude of ${\cal O}(10^{-13}-10^{-12})$. In addition, we
examine the oblique parameters in the model and find that the resulting
$W$-mass anomaly observed by CDF II can be accommodated.
| [
{
"created": "Tue, 17 Jan 2023 18:32:34 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jan 2023 16:40:14 GMT",
"version": "v2"
}
] | 2023-02-01 | [
[
"Chen",
"Chuan-Hung",
""
],
[
"Chiang",
"Cheng-Wei",
""
],
[
"Su",
"Chun-Wei",
""
]
] | The observed flavor-changing neutral-current (FCNC) processes in the standard model (SM) arise from the loop diagrams involving the weak charged currents mediated by the $W$-gauge boson. Nevertheless, the top-quark FCNCs and lepton-flavor violating processes resulting from the same mechanism are highly suppressed. We investigate possible new physics effects that can enhance the suppressed FCNC processes, such as $t\to q(h,V)$ with $V=\gamma,Z,g$, $h\to \ell \ell'$, and $\ell\to \ell' \gamma$. To achieve the assumption that the induced-FCNCs are all from quantum loops, we consider the scotogenic mechanism, where a $Z_2$ symmetry is introduced and only new particles carry an odd $Z_2$ parity. With the extension of the SM to include an inert Higgs doublet, an inert charged Higgs singlet, a vector-like singlet quark, and two neutral leptons, it is found that, with relevant constraints taken into account, the $t\to c (h, Z)$, $h\to \mu\tau$, and $\tau\to \ell \gamma$ decays can be enhanced up to the expected sensitivities in experiments. The branching ratios of $h\to \mu^+ \mu^-/\tau^+ \tau^-$ from only new physics effects can reach up to ${\cal O}(10^{-3})$. Intriguingly, the resulting muon $g-2$ can fit the combined data within $2\sigma$ errors, whereas the electron $g-2$ can have either sign with a magnitude of ${\cal O}(10^{-13}-10^{-12})$. In addition, we examine the oblique parameters in the model and find that the resulting $W$-mass anomaly observed by CDF II can be accommodated. |
2004.11564 | Yoshiharu Kawamura | Yoshiharu Kawamura | On a mechanism realizing quark mass hierarchy | 9 pages | null | 10.1142/S0217732320502740 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reconsider a generation of up-type quark mass hierarchy in the standard
model and clarify how a mechanism works to realize the hierarchy without severe
fine tuning.
| [
{
"created": "Fri, 24 Apr 2020 07:10:43 GMT",
"version": "v1"
}
] | 2020-12-02 | [
[
"Kawamura",
"Yoshiharu",
""
]
] | We reconsider a generation of up-type quark mass hierarchy in the standard model and clarify how a mechanism works to realize the hierarchy without severe fine tuning. |
hep-ph/0609051 | Tord Riemann | Stefano Actis (DESY), Michal Czakon (Wuerzburg U. and Silesia U.),
Janusz Gluza (Silesia U.), Tord Riemann (DESY) | Planar two-loop master integrals for massive Bhabha scattering: N_f=1
and N_f=2 | 10 pages, 3 figures, 1 table, to appear in the proceedings of 8th
DESY Workshop on Elementary Particle Theory: Loops and Legs in Quantum Field
Theory, Eisenach, Germany, 23-28 Apr 2006; eqns. 22 and 23 corrected | null | 10.1016/j.nuclphysbps.2006.09.034 | DESY 06-154, SFB/CPP-06-40 | hep-ph | null | Recent developments in the computation of two-loop master integrals for
massive Bhabha scattering are briefly reviewed. We apply a method based on
expansions of exact Mellin-Barnes representations and evaluate all planar
four-point master integrals in the approximation of small electron mass at
fixed scattering angle for the one-flavor case. The same technique is employed
to derive and evaluate also all two-loop masters generated by additional
fermion flavors. The approximation is sufficient for the determination of QED
two-loop corrections for Bhabha scattering in the kinematics planned to be used
for the luminosity determination at the ILC.
| [
{
"created": "Tue, 5 Sep 2006 16:43:37 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jul 2007 16:56:42 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Actis",
"Stefano",
"",
"DESY"
],
[
"Czakon",
"Michal",
"",
"Wuerzburg U. and Silesia U."
],
[
"Gluza",
"Janusz",
"",
"Silesia U."
],
[
"Riemann",
"Tord",
"",
"DESY"
]
] | Recent developments in the computation of two-loop master integrals for massive Bhabha scattering are briefly reviewed. We apply a method based on expansions of exact Mellin-Barnes representations and evaluate all planar four-point master integrals in the approximation of small electron mass at fixed scattering angle for the one-flavor case. The same technique is employed to derive and evaluate also all two-loop masters generated by additional fermion flavors. The approximation is sufficient for the determination of QED two-loop corrections for Bhabha scattering in the kinematics planned to be used for the luminosity determination at the ILC. |
hep-ph/0212304 | Tobias Hurth | Tobias Hurth (CERN, SLAC) | Present Status of Inclusive Rare B Decays | 80 pages, 37 figures, latex, references added Invited contribution to
Reviews of Modern Physics | Rev.Mod.Phys.75:1159-1199,2003 | 10.1103/RevModPhys.75.1159 | CERN-TH/2002-264, SLAC-PUB-9604 | hep-ph hep-ex | null | We give a status report on inclusive rare B decays, highlighting recent
developments and open problems. We focus on the decay modes $B \to X_{s,d}
\gamma$, $ B \to X_s \ell^+\ell^-$ and $B \to X_s \nu \bar \nu$ and on their
role in the search for new physics. Most of the inclusive rare B decays are
important modes of flavour physics due to the small hadronic uncertainties.
They can be regarded as laboratories to search for new physics. We collect the
experimental data already available from CLEO and the $B$ factories BABAR and
BELLE. We review the NLL and NNLL QCD calculations of the inclusive decay rates
that were recently completed, and discuss future prospects, especially the
issue of the charm mass scheme ambiguity. Finally, we analyse the
phenomenological impact of these decay modes, in particular on the CKM
phenomenology and on the indirect search for supersymmetry. We also briefly
discuss direct CP violation in inclusive rare B decays, as well as the rare
kaon decays $K^+\to \pi^+\nu\bar{\nu}$ and $K_L \to \pi^0 \nu \bar{\nu}$, which
offer complementary theoretically clean information.
| [
{
"created": "Thu, 19 Dec 2002 20:50:24 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Feb 2003 23:47:45 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Hurth",
"Tobias",
"",
"CERN, SLAC"
]
] | We give a status report on inclusive rare B decays, highlighting recent developments and open problems. We focus on the decay modes $B \to X_{s,d} \gamma$, $ B \to X_s \ell^+\ell^-$ and $B \to X_s \nu \bar \nu$ and on their role in the search for new physics. Most of the inclusive rare B decays are important modes of flavour physics due to the small hadronic uncertainties. They can be regarded as laboratories to search for new physics. We collect the experimental data already available from CLEO and the $B$ factories BABAR and BELLE. We review the NLL and NNLL QCD calculations of the inclusive decay rates that were recently completed, and discuss future prospects, especially the issue of the charm mass scheme ambiguity. Finally, we analyse the phenomenological impact of these decay modes, in particular on the CKM phenomenology and on the indirect search for supersymmetry. We also briefly discuss direct CP violation in inclusive rare B decays, as well as the rare kaon decays $K^+\to \pi^+\nu\bar{\nu}$ and $K_L \to \pi^0 \nu \bar{\nu}$, which offer complementary theoretically clean information. |
1711.11182 | Wei Chao | Wei Chao, Qiang Yuan | The electron-flavored Z'-portal dark matter and the DAMPE cosmic ray
excess | 17 pages, 4 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The DAMPE experiment has recently reported strong indications for the
existence of an excess of high-energy electrons and positrons. If interpreted
in terms of the annihilation of dark matter, the DAMPE result restricts the
dark matter mass and possible annihilation channels to a few case. In this
paper we explain the DAMPE result with the electron-flavored $Z^\prime$-portal
fermionic dark matter. We show that the Dirac dark matter scenario is promising
to explain the excess via the process $\bar \chi \chi \to\mathbf{Z}'\to \bar e
e$. The reduced annihilation cross section is limited in a range of
$10^{-26}\sim 10^{-24}~{\rm cm^3 s^{-1}}$ to interpret the excess.
| [
{
"created": "Thu, 30 Nov 2017 01:46:48 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Dec 2017 08:28:44 GMT",
"version": "v2"
}
] | 2017-12-05 | [
[
"Chao",
"Wei",
""
],
[
"Yuan",
"Qiang",
""
]
] | The DAMPE experiment has recently reported strong indications for the existence of an excess of high-energy electrons and positrons. If interpreted in terms of the annihilation of dark matter, the DAMPE result restricts the dark matter mass and possible annihilation channels to a few case. In this paper we explain the DAMPE result with the electron-flavored $Z^\prime$-portal fermionic dark matter. We show that the Dirac dark matter scenario is promising to explain the excess via the process $\bar \chi \chi \to\mathbf{Z}'\to \bar e e$. The reduced annihilation cross section is limited in a range of $10^{-26}\sim 10^{-24}~{\rm cm^3 s^{-1}}$ to interpret the excess. |
hep-ph/0409049 | Stefano Moretti Dr | S. Moretti (Southampton) | Six-fermions (and more) studies | 4 pages, LaTeX, presented at the International Conference on Linear
Colliders LCWS04 (19-23 April 2004, Paris, France) | null | null | SHEP-04-24, LC-TOOL-2004-018 | hep-ph | null | We review the available event generators suited for multi-fermion final state
production in the context of physics studies at a future Linear Collider (LC)
| [
{
"created": "Sun, 5 Sep 2004 18:57:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Moretti",
"S.",
"",
"Southampton"
]
] | We review the available event generators suited for multi-fermion final state production in the context of physics studies at a future Linear Collider (LC) |
1406.3301 | Anatoly Borisov | A. V. Borisov and P. E. Sizin | Plasmon decay to a neutrino pair via neutrino electromagnetic moments in
a strongly magnetized medium | 3 pages, submitted to the Proceedings of the 16th Lomonosov
Conference on Elementary Particle Physics, Moscow State University, Moscow,
Russia, August 2013 | null | 10.1142/9789814663618_0024 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the neutrino luminosity of a degenerate electron gas in a strong
magnetic field via plasmon decay to a neutrino pair due to neutrino
electromagnetic moments and obtain the relative upper bounds on the effective
neutrino magnetic moment.
| [
{
"created": "Thu, 12 Jun 2014 17:58:24 GMT",
"version": "v1"
}
] | 2015-09-02 | [
[
"Borisov",
"A. V.",
""
],
[
"Sizin",
"P. E.",
""
]
] | We calculate the neutrino luminosity of a degenerate electron gas in a strong magnetic field via plasmon decay to a neutrino pair due to neutrino electromagnetic moments and obtain the relative upper bounds on the effective neutrino magnetic moment. |
2212.05616 | Robert Jaffe | Robert L. Jaffe | Deep Inelastic Scattering with Application to Nuclear Targets: Lectures
at the 1985 Los Alamos School on Relativistic Dynamics and Quark Nuclear
Physics | Reconstruction of Lectures at the 1985 Los Alamos School on
Relativistic Dynamics and Quark Nuclear Physics | Published in M. B. Johnson and A. Picklesimer, eds., Relativistic
Dynamics and Quark Nuclear Physics, (Wiley-Interscience, New York, 1986) | null | MIT-CTP-1261 | hep-ph hep-th nucl-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | This paper is essentially a verbatim reconstruction of lectures that I gave
at the Los Alamos School on Relativistic Dynamics and Quark Nuclear Physics in
1985. They were published in the school proceedings, but the book is not widely
available. The Los Alamos School took place at the height of the first wave of
interest in the quark substructure of nuclei, stimulated by the 1983 discovery
of the EMC Effect. Interest in this subject has been increasing for years and
the prospect of a dedicated Electron Ion Collider within the decade guarantees
even greater attention to quarks and gluons in nuclei among both theorists and
experimentalists.
Recently, to my surprise, I learned that copies of my old lectures have been
circulating and been found useful by the relatively few people who know about
them. The are, of course, dated: experiments have far outstripped what was
available 37 years ago and theory has progressed too. However, the rest frame
derivation of the parton model, the derivation and discussion of the
convolution formalism for nucleons, nucleon correlations, and other, virtual,
constituents of nuclei, and sections on scaling violation and the operator
product expansion have aged pretty well and seem to still be useful.
With the help and encouragement of Richard Milner, I have recreated the LaTeX
files necessary to post the 1985 Lectures on the arXiv, making them available
to the nuclear and particle physics community. Apart from correcting some
typographical errors, I have made no attempt to edit, improve, or update these
lectures. I hope readers will nevertheless find them useful.
| [
{
"created": "Sun, 11 Dec 2022 22:13:50 GMT",
"version": "v1"
}
] | 2022-12-13 | [
[
"Jaffe",
"Robert L.",
""
]
] | This paper is essentially a verbatim reconstruction of lectures that I gave at the Los Alamos School on Relativistic Dynamics and Quark Nuclear Physics in 1985. They were published in the school proceedings, but the book is not widely available. The Los Alamos School took place at the height of the first wave of interest in the quark substructure of nuclei, stimulated by the 1983 discovery of the EMC Effect. Interest in this subject has been increasing for years and the prospect of a dedicated Electron Ion Collider within the decade guarantees even greater attention to quarks and gluons in nuclei among both theorists and experimentalists. Recently, to my surprise, I learned that copies of my old lectures have been circulating and been found useful by the relatively few people who know about them. The are, of course, dated: experiments have far outstripped what was available 37 years ago and theory has progressed too. However, the rest frame derivation of the parton model, the derivation and discussion of the convolution formalism for nucleons, nucleon correlations, and other, virtual, constituents of nuclei, and sections on scaling violation and the operator product expansion have aged pretty well and seem to still be useful. With the help and encouragement of Richard Milner, I have recreated the LaTeX files necessary to post the 1985 Lectures on the arXiv, making them available to the nuclear and particle physics community. Apart from correcting some typographical errors, I have made no attempt to edit, improve, or update these lectures. I hope readers will nevertheless find them useful. |
hep-ph/9508269 | null | Joe Sato | A SUSY SO(10) GUT with an Intermediate Scale | 36 pages, LaTeX, I fixed several mistakes as follows. 1. delete
Appendix D because there was a mistake and if I fix it, it becomes nothing
interesting. 2. matrix M(2,1,\pm 1/2) at the last half of the section 4 is
changed. COnsequent result is not essentially changed. 3. several typological
errors are fixed | Phys.Rev. D53 (1996) 3884-3901 | 10.1103/PhysRevD.53.3884 | KUNS-1353 | hep-ph | null | We examine a superpotential for an SO(10) GUT and show that if the parameters
of the superpotential are in a certain region, the SO(10) GUT has an
intermediate symmetry ${\rm SU(2)}_L \otimes {\rm SU(2)}_R \otimes {\rm
SU(3)}_C \otimes {\rm U(1)}_{B-L}$ which breaks down to the group of the
Standard Model at an intermediate scale $10^{10-12}$ GeV. In the model by the
breakdown of the symmetry right-handed neutrinos acquire mass of the
intermediate scale through a renormalizable Yukawa coupling.
| [
{
"created": "Wed, 9 Aug 1995 09:36:57 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Aug 1995 02:42:43 GMT",
"version": "v2"
},
{
"created": "Tue, 29 Aug 1995 07:44:14 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Sato",
"Joe",
""
]
] | We examine a superpotential for an SO(10) GUT and show that if the parameters of the superpotential are in a certain region, the SO(10) GUT has an intermediate symmetry ${\rm SU(2)}_L \otimes {\rm SU(2)}_R \otimes {\rm SU(3)}_C \otimes {\rm U(1)}_{B-L}$ which breaks down to the group of the Standard Model at an intermediate scale $10^{10-12}$ GeV. In the model by the breakdown of the symmetry right-handed neutrinos acquire mass of the intermediate scale through a renormalizable Yukawa coupling. |
0909.3659 | Jaroslaw Nowak | Jaroslaw A. Nowak | Four Momentum Transfer Discrepancy in the Charged Current $\pi^+$
Production in the MiniBooNE: Data vs. Theory | Presented at 6th International Workshop on Neutrino-Nucleus
Interactions in the Few-GeV Region (NUINT 2009), Sitges, Barcelona, Spain,
18-22 May 2009. Submitted to AIP Conf.Proc | AIP Conf.Proc.1189:243-248,2009 | 10.1063/1.3274164 | FERMILAB-CONF-09-439-E-PPD | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The MiniBooNE experiment has collected what is currently the world's largest
sample of neutrino muon charged current single charged pion interactions,
roughly 46,000 events. The purity of the CC1pi+ sample is 87% making this the
purest event sample observed in the MiniBooNE detector. The average energy of
neutrinos producing CC1pi+ interactions in MiniBooNE is about 1 GeV, therefore
the study of these events can provide insight into both resonant and coherent
pion production processes. In this talk, we will discuss the long-standing
discrepancy in four-momentum transfer observed between CC1pi+ data and existing
predictions. Several attempts to address this problem will be presented.
Specifically, the Rein-Sehgal model has been extended to include muon mass
terms for both resonant [Kuzmin et al. and Berger and Sehgal] and coherent
production. Using calculations from Graczyk and Sobczyk paper, an updated form
for the vector form factor [Lalakulich et al.] has also been adopted. The
results of this improved description of CC1pi+ production will be compared to
the high statistics MiniBooNE CC1pi+ data and several existing parametrisations
of the axial vector form factor.
| [
{
"created": "Sun, 20 Sep 2009 23:03:14 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Sep 2009 02:58:10 GMT",
"version": "v2"
}
] | 2009-12-07 | [
[
"Nowak",
"Jaroslaw A.",
""
]
] | The MiniBooNE experiment has collected what is currently the world's largest sample of neutrino muon charged current single charged pion interactions, roughly 46,000 events. The purity of the CC1pi+ sample is 87% making this the purest event sample observed in the MiniBooNE detector. The average energy of neutrinos producing CC1pi+ interactions in MiniBooNE is about 1 GeV, therefore the study of these events can provide insight into both resonant and coherent pion production processes. In this talk, we will discuss the long-standing discrepancy in four-momentum transfer observed between CC1pi+ data and existing predictions. Several attempts to address this problem will be presented. Specifically, the Rein-Sehgal model has been extended to include muon mass terms for both resonant [Kuzmin et al. and Berger and Sehgal] and coherent production. Using calculations from Graczyk and Sobczyk paper, an updated form for the vector form factor [Lalakulich et al.] has also been adopted. The results of this improved description of CC1pi+ production will be compared to the high statistics MiniBooNE CC1pi+ data and several existing parametrisations of the axial vector form factor. |
1508.05407 | Zerrin Kirca | Zerrin Kirca | Associated Production of Z_H and T in the Littlest Higgs Model at High
Energy Linear e^-e^+ Collider | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study associated production of heavy Z boson and heavy top
quark in the framework of Littlest Higgs model at e^-e^+ colliders considering
parameter space allowed by the electroweak precision measurments. According to
the free parameters of the model the possibility of detecting of new heavy
particles at sqrt{s}=3 TeV and yearly integrated luminosity of L=500 fb^-1 are
discussed. We find that in a narrow range of the parameter space,
s/s'=0.8/0.6,0.7, 0.4 <= x_L <= 0.6 and f <~1060 GeV, a statical significance
of 5 sigma can be achieved. We also discuss constraints on masses of heavy top
quark and heavy Z boson together with the mixing parameters s and x_L at
sqrt{s}=3000 GeV.
| [
{
"created": "Fri, 21 Aug 2015 20:52:19 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Jan 2016 14:54:44 GMT",
"version": "v2"
}
] | 2016-01-05 | [
[
"Kirca",
"Zerrin",
""
]
] | In this work we study associated production of heavy Z boson and heavy top quark in the framework of Littlest Higgs model at e^-e^+ colliders considering parameter space allowed by the electroweak precision measurments. According to the free parameters of the model the possibility of detecting of new heavy particles at sqrt{s}=3 TeV and yearly integrated luminosity of L=500 fb^-1 are discussed. We find that in a narrow range of the parameter space, s/s'=0.8/0.6,0.7, 0.4 <= x_L <= 0.6 and f <~1060 GeV, a statical significance of 5 sigma can be achieved. We also discuss constraints on masses of heavy top quark and heavy Z boson together with the mixing parameters s and x_L at sqrt{s}=3000 GeV. |
1707.00056 | Yusuf Gunaydin | Yusuf Oguzhan G\"unayd{\i}n (1), Mehmet Sahin (2), Saleh Sultansoy (3)
((1) KS\"U, (2) Usak U., (3) TOBB ETU) | Resonance Production of Excited u-quark at the FCC Based $\gamma$ $p$
Colliders | 20 pages, 11 figures, 7 tables | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several Beyond the Standard Model theories are proposed that fermions might
have composite substructure. The existence of excited quarks is going to be the
noticeable proof for the compositeness of Standard Model fermions. For this
reason, excited quarks have been investigated by phenomenological and
experimental high energy physicists at various collider options for the last
few decades. The Future Circular Collider (FCC) has been recently planned as
particle accelerator to be established at CERN. Beside the $\sqrt{s}$ = 100 TeV
proton-proton collisions, the FCC includes electron-positron and
electron-proton collision options. Construction of linear $e^- e^+$ colliders
(or dedicated e-linac) tangential to the FCC will afford an opportunity to
handle multi-TeV $ep$ and $\gamma p$ collisions. In this respect, we executed a
simulation of the resonance production of the excited $u$ quark at the FCC
based $\gamma p$ colliders with choosing both the polarized and unpolarized
photon beams. The findings revealed that the chirality structure of the
$q^*$-$q$-$\gamma$ vertex can be determined by the photon beam polarization.
The attainable mass limits of the excited $u$ quark reached the highest values
when the polarized photon beam was chosen. In addition, the ultimate
compositeness scale values can be handled by appropriate choice of the photon
beam polarization.
| [
{
"created": "Fri, 30 Jun 2017 22:06:26 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Aug 2017 12:32:42 GMT",
"version": "v2"
},
{
"created": "Sat, 16 Sep 2017 20:37:51 GMT",
"version": "v3"
},
{
"created": "Wed, 26 Sep 2018 19:45:28 GMT",
"version": "v4"
}
] | 2018-09-28 | [
[
"Günaydın",
"Yusuf Oguzhan",
"",
"KSÜ"
],
[
"Sahin",
"Mehmet",
"",
"Usak U"
],
[
"Sultansoy",
"Saleh",
"",
"TOBB ETU"
]
] | Several Beyond the Standard Model theories are proposed that fermions might have composite substructure. The existence of excited quarks is going to be the noticeable proof for the compositeness of Standard Model fermions. For this reason, excited quarks have been investigated by phenomenological and experimental high energy physicists at various collider options for the last few decades. The Future Circular Collider (FCC) has been recently planned as particle accelerator to be established at CERN. Beside the $\sqrt{s}$ = 100 TeV proton-proton collisions, the FCC includes electron-positron and electron-proton collision options. Construction of linear $e^- e^+$ colliders (or dedicated e-linac) tangential to the FCC will afford an opportunity to handle multi-TeV $ep$ and $\gamma p$ collisions. In this respect, we executed a simulation of the resonance production of the excited $u$ quark at the FCC based $\gamma p$ colliders with choosing both the polarized and unpolarized photon beams. The findings revealed that the chirality structure of the $q^*$-$q$-$\gamma$ vertex can be determined by the photon beam polarization. The attainable mass limits of the excited $u$ quark reached the highest values when the polarized photon beam was chosen. In addition, the ultimate compositeness scale values can be handled by appropriate choice of the photon beam polarization. |
1709.05848 | Markus Huber Q. | Markus Q. Huber | On non-primitively divergent vertices of Yang-Mills theory | 11 pages, 10 figures | null | 10.1140/epjc/s10052-017-5310-y | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two correlation functions of Yang-Mills beyond the primitively divergent
ones, the two-ghost-two-gluon and the four-ghost vertices, are calculated and
their influence on lower vertices is examined. Their full (transverse) tensor
structure is taken into account. As input, a solution of the full two-point
equations - including two-loop terms - is used that respects the resummed
perturbative ultraviolet behavior. A clear hierarchy is found with regard to
the color structure that reduces the number of relevant dressing functions. The
impact of the two-ghost-two-gluon vertex on the three-gluon vertex is
negligible, which is explained by the fact that all non-small dressing
functions drop out due to their color factors. Only in the ghost-gluon vertex a
small net effect below $2\%$ is seen. The four-ghost vertex is found to be
extremely small in general. Since these two four-point functions do not enter
into the propagator equations, these findings establish their small overall
effect on lower correlation functions.
| [
{
"created": "Mon, 18 Sep 2017 10:29:39 GMT",
"version": "v1"
}
] | 2017-12-06 | [
[
"Huber",
"Markus Q.",
""
]
] | Two correlation functions of Yang-Mills beyond the primitively divergent ones, the two-ghost-two-gluon and the four-ghost vertices, are calculated and their influence on lower vertices is examined. Their full (transverse) tensor structure is taken into account. As input, a solution of the full two-point equations - including two-loop terms - is used that respects the resummed perturbative ultraviolet behavior. A clear hierarchy is found with regard to the color structure that reduces the number of relevant dressing functions. The impact of the two-ghost-two-gluon vertex on the three-gluon vertex is negligible, which is explained by the fact that all non-small dressing functions drop out due to their color factors. Only in the ghost-gluon vertex a small net effect below $2\%$ is seen. The four-ghost vertex is found to be extremely small in general. Since these two four-point functions do not enter into the propagator equations, these findings establish their small overall effect on lower correlation functions. |
1001.1636 | Enrique Ruiz Arriola | Enrique Ruiz Arriola, Wojciech Broniowski | Scalar-isoscalar states in the large-Nc Regge approach | 18 pages, 13 figures. Typos corrected. Remarks and references added | Phys.Rev.D81:054009,2010 | 10.1103/PhysRevD.81.054009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scalar-isoscalar states (0++) are investigated within the large-Nc Regge
approach. We elaborate on the consequences of including the lightest f0(600)
scalar-isoscalar state into such an analysis, where the position of f0(600)
fits very well into the pattern of the radial Regge trajectory. Furthermore, we
point out that the pion and nucleon spin-0 gravitational form factors, recently
measured on the lattice, provide valuable information on the low-mass spectrum
of the scalar-isoscalar states on the basis of the scalar-meson dominance in
the spin-0 channel. Through the fits to these data we find m_sigma= 450-600
MeV. We compare the predictions of various fits and methods. An analysis of the
QCD condensates in the two-point correlators provides further constraints on
the parameters of the scalar-isoscalar sector. We find that a simple two-state
model suggests a meson nature of f0(600), and a glueball nature of f0(980),
which naturally explains the ratios of various coupling constants. Finally, we
note that the fine-tuned condition of the vanishing dimension-2 condensate in
the Regge approach with infinitely many scalar-isoscalar states yields a
reasonable value for the mass of the lighest glueball state.
| [
{
"created": "Mon, 11 Jan 2010 11:58:22 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Feb 2010 16:09:47 GMT",
"version": "v2"
}
] | 2010-05-28 | [
[
"Arriola",
"Enrique Ruiz",
""
],
[
"Broniowski",
"Wojciech",
""
]
] | Scalar-isoscalar states (0++) are investigated within the large-Nc Regge approach. We elaborate on the consequences of including the lightest f0(600) scalar-isoscalar state into such an analysis, where the position of f0(600) fits very well into the pattern of the radial Regge trajectory. Furthermore, we point out that the pion and nucleon spin-0 gravitational form factors, recently measured on the lattice, provide valuable information on the low-mass spectrum of the scalar-isoscalar states on the basis of the scalar-meson dominance in the spin-0 channel. Through the fits to these data we find m_sigma= 450-600 MeV. We compare the predictions of various fits and methods. An analysis of the QCD condensates in the two-point correlators provides further constraints on the parameters of the scalar-isoscalar sector. We find that a simple two-state model suggests a meson nature of f0(600), and a glueball nature of f0(980), which naturally explains the ratios of various coupling constants. Finally, we note that the fine-tuned condition of the vanishing dimension-2 condensate in the Regge approach with infinitely many scalar-isoscalar states yields a reasonable value for the mass of the lighest glueball state. |
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