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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9708308 | Qiuyu Liu | Qiu-Yu Liu | Mixed MSW and Vacuum Solutions of Solar Neutrino Problem | 15 pages, latex, uses epsfig and sprocl, talk given at the 4th
International Solar Neutrino Conference, Heidelberg, Germany, April 8-14,
1997 | null | null | null | hep-ph astro-ph | null | Assuming three flavour neutrino mixing takes place in vacuum, we investigate
the possibility that the solar $\nu_e$ take part in MSW transitions in the Sun
due to $\Delta m^2_{31} \sim (10^{-7} - 10^{-4})~eV^2$, followed by long wave
length vacuum oscillations on the way to the Earth, triggered by $\Delta
m^2_{21}$ (or $\Delta m^2_{32}$) $\sim (10^{-12} - 10^{-10})~eV^2$. The solar
$\nu_e$ survival probability is shown to be described in this case by a simple
analytic expression. New ranges of neutrino parameters which allow to fit the
solar neutrino data have been found. The best fit characterized by the minimum
$\chi^2$ is extremely good. This hybrid (MSW+vacuum oscillations) solution of
the solar neutrino problem leads to peculiar distortions of energy spectrum of
the boron neutrinos which can be observed by the SuperKamiokande and SNO
experiments. Other flavour scheme (e.g. 2 active $\nu$s + 1 sterile $\nu$) can
provide MSW+vacuum solution also.
| [
{
"created": "Mon, 11 Aug 1997 19:54:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Liu",
"Qiu-Yu",
""
]
] | Assuming three flavour neutrino mixing takes place in vacuum, we investigate the possibility that the solar $\nu_e$ take part in MSW transitions in the Sun due to $\Delta m^2_{31} \sim (10^{-7} - 10^{-4})~eV^2$, followed by long wave length vacuum oscillations on the way to the Earth, triggered by $\Delta m^2_{21}$ (or $\Delta m^2_{32}$) $\sim (10^{-12} - 10^{-10})~eV^2$. The solar $\nu_e$ survival probability is shown to be described in this case by a simple analytic expression. New ranges of neutrino parameters which allow to fit the solar neutrino data have been found. The best fit characterized by the minimum $\chi^2$ is extremely good. This hybrid (MSW+vacuum oscillations) solution of the solar neutrino problem leads to peculiar distortions of energy spectrum of the boron neutrinos which can be observed by the SuperKamiokande and SNO experiments. Other flavour scheme (e.g. 2 active $\nu$s + 1 sterile $\nu$) can provide MSW+vacuum solution also. |
2006.16267 | Giacomo Cacciapaglia | Giacomo Cacciapaglia, Chengfeng Cai, Mads T.Frandsen, Martin
Rosenlyst, Hong Hao Zhang | XENON1T solar axion and the Higgs boson emerging from the dark | 6 pages, 2 figures | Phys. Rev. D 102, 075018 (2020) | 10.1103/PhysRevD.102.075018 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent letter we proposed a new non-thermal mechanism of Dark Matter
production based on vacuum misalignment, where both the Higgs boson and a very
light pseudo-scalar $\eta$ emerge from the Dark sector. In this letter, we
identify the parameter space in a composite scenario where the light
pseudo-scalar can be produced in the sun and explain the XENON1T excess in
electron recoil data. The model's Dark Matter candidate has a mass around $50$
TeV and out of range for Direct Detection. Testable predictions include
Gravitational waves at frequencies in the Hz range from a cosmological phase
transition, an exotic decay $Z \to \gamma + \mbox{inv.}$ with rates $4 \div 16
\cdot 10^{-12}$ testable at a future Tera-Z collider, and an enhancement by
$17\div 40$ % of the branching ratio $K_L \to \pi^0 + \mbox{inv.}$, not enough
to explain the KOTO anomaly. All these predictions may be confirmed by future
experiments.
| [
{
"created": "Mon, 29 Jun 2020 18:00:07 GMT",
"version": "v1"
}
] | 2020-10-21 | [
[
"Cacciapaglia",
"Giacomo",
""
],
[
"Cai",
"Chengfeng",
""
],
[
"Frandsen",
"Mads T.",
""
],
[
"Rosenlyst",
"Martin",
""
],
[
"Zhang",
"Hong Hao",
""
]
] | In a recent letter we proposed a new non-thermal mechanism of Dark Matter production based on vacuum misalignment, where both the Higgs boson and a very light pseudo-scalar $\eta$ emerge from the Dark sector. In this letter, we identify the parameter space in a composite scenario where the light pseudo-scalar can be produced in the sun and explain the XENON1T excess in electron recoil data. The model's Dark Matter candidate has a mass around $50$ TeV and out of range for Direct Detection. Testable predictions include Gravitational waves at frequencies in the Hz range from a cosmological phase transition, an exotic decay $Z \to \gamma + \mbox{inv.}$ with rates $4 \div 16 \cdot 10^{-12}$ testable at a future Tera-Z collider, and an enhancement by $17\div 40$ % of the branching ratio $K_L \to \pi^0 + \mbox{inv.}$, not enough to explain the KOTO anomaly. All these predictions may be confirmed by future experiments. |
hep-ph/0703114 | Pedro Bicudo | P. Bicudo | The large degeneracy of excited hadrons and quark models | 8 pages, 2 tables, 3 figures, references added and j=0 case further
clarified | Phys.Rev.D76:094005,2007 | 10.1103/PhysRevD.76.094005 | null | hep-ph | null | The pattern of a large approximate degeneracy of the excited hadron spectra
(larger than the chiral restoration degeneracy) is present in the recent
experimental report of Bugg. Here we try to model this degeneracy with state of
the art quark models. We review how the Coulomb Gauge chiral invariant and
confining Bethe-Salpeter equation simplifies in the case of very excited
quark-antiquark mesons, including angular or radial excitations, to a Salpeter
equation with an ultrarelativistic kinetic energy with the spin-independent
part of the potential. The resulting meson spectrum is solved, and the excited
chiral restoration is recovered, for all mesons with J > 0. Applying the
ultrarelativistic simplification to a linear equal-time potential, linear Regge
trajectories are obtained, for both angular and radial xcitations. The spectrum
is also compared with the semi-classical Bohr-Sommerfeld quantization relation.
However the excited angular and radial spectra do not coincide exactly. We then
search, with the classical Bertrand theorem, for central potentials producing
always classical closed orbits with the ultrarelativistic kinetic energy. We
find that no such potential exists, and this implies that no exact larger
degeneracy can be obtained in our equal-time framework, with a single principal
quantum number comparable to the non-relativistic Coulomb or harmonic
oscillator potentials. Nevertheless we find plausible that the large
experimental approximate degeneracy will be modelled in the future by quark
models beyond the present state of the art.
| [
{
"created": "Sun, 11 Mar 2007 11:48:45 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Mar 2007 11:12:59 GMT",
"version": "v2"
}
] | 2008-12-18 | [
[
"Bicudo",
"P.",
""
]
] | The pattern of a large approximate degeneracy of the excited hadron spectra (larger than the chiral restoration degeneracy) is present in the recent experimental report of Bugg. Here we try to model this degeneracy with state of the art quark models. We review how the Coulomb Gauge chiral invariant and confining Bethe-Salpeter equation simplifies in the case of very excited quark-antiquark mesons, including angular or radial excitations, to a Salpeter equation with an ultrarelativistic kinetic energy with the spin-independent part of the potential. The resulting meson spectrum is solved, and the excited chiral restoration is recovered, for all mesons with J > 0. Applying the ultrarelativistic simplification to a linear equal-time potential, linear Regge trajectories are obtained, for both angular and radial xcitations. The spectrum is also compared with the semi-classical Bohr-Sommerfeld quantization relation. However the excited angular and radial spectra do not coincide exactly. We then search, with the classical Bertrand theorem, for central potentials producing always classical closed orbits with the ultrarelativistic kinetic energy. We find that no such potential exists, and this implies that no exact larger degeneracy can be obtained in our equal-time framework, with a single principal quantum number comparable to the non-relativistic Coulomb or harmonic oscillator potentials. Nevertheless we find plausible that the large experimental approximate degeneracy will be modelled in the future by quark models beyond the present state of the art. |
1608.01502 | Agnieszka Luszczak | Agnieszka Luszczak | Dipole model analysis of the new HERA I+II data | 5 pages, 1 figure Conference data: conf id: 265 short name: DIS2016
long name: XXIV International Workshop on Deep-Inelastic Scattering and
Related Subjects time: 11-15 April, 2016 location: DESY Hamburg, Germany
deadline: September 1st, 2016 | POS Proceedings of Science 2016 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the dipole model to analyze the inclusive DIS cross section data,
obtained from the HERA I+II measurements \cite{Abramowicz:2015mha}. We show
that these combined data are very well described within the dipole model
framework, which is complemented with a valence quark structure functions. Our
motivation is to investigate the gluon density with the BGK dipole model
\cite{BGK} as an alternative to the PDF approach. BGK dipole model uses for
evolution the DGLAP mechanism in the $kt$ factorization scheme (in contrast to
the collinear factorization for PDFs). We confirm our results from the previous
paper \cite{Luszczak:2013rxa} with old HERA data \cite{HERA2010}. In addition
we also performed a first, preliminary investigation of saturation. The
analysis was done in the xFitter framework
\cite{xFitter,xFitter2,xFitter3,xFitter4,xFitter5}.}
| [
{
"created": "Thu, 4 Aug 2016 11:38:17 GMT",
"version": "v1"
}
] | 2016-08-05 | [
[
"Luszczak",
"Agnieszka",
""
]
] | We use the dipole model to analyze the inclusive DIS cross section data, obtained from the HERA I+II measurements \cite{Abramowicz:2015mha}. We show that these combined data are very well described within the dipole model framework, which is complemented with a valence quark structure functions. Our motivation is to investigate the gluon density with the BGK dipole model \cite{BGK} as an alternative to the PDF approach. BGK dipole model uses for evolution the DGLAP mechanism in the $kt$ factorization scheme (in contrast to the collinear factorization for PDFs). We confirm our results from the previous paper \cite{Luszczak:2013rxa} with old HERA data \cite{HERA2010}. In addition we also performed a first, preliminary investigation of saturation. The analysis was done in the xFitter framework \cite{xFitter,xFitter2,xFitter3,xFitter4,xFitter5}.} |
hep-ph/0505025 | Oliver Fochler | O. Fochler, S.Vogel, M. Bleicher, C. Greiner, P. Koch-Steinheimer, Z.
Xu | Dynamic canonical suppression of strangeness in transport models | 3 pages, 2 figures; To appear in the proceedings of the 43rd
International Winter Meeting on Nuclear Physics, Bormio, Italy, 13 Mar - 20
Mar 2005 | null | null | null | hep-ph | null | It is investigated whether canonical suppression associated with the exact
conservation of an U(1)-charge can be reproduced correctly by current transport
models. Therefore a pion-gas having a volume-limited cross section for kaon
production and annihilation is simulated within two different transport
prescriptions for realizing the inelastic collisions. It is found that both
models can indeed dynamically account for the canonical suppression in the
yields of rare strange particles.
| [
{
"created": "Wed, 4 May 2005 09:51:28 GMT",
"version": "v1"
}
] | 2015-07-21 | [
[
"Fochler",
"O.",
""
],
[
"Vogel",
"S.",
""
],
[
"Bleicher",
"M.",
""
],
[
"Greiner",
"C.",
""
],
[
"Koch-Steinheimer",
"P.",
""
],
[
"Xu",
"Z.",
""
]
] | It is investigated whether canonical suppression associated with the exact conservation of an U(1)-charge can be reproduced correctly by current transport models. Therefore a pion-gas having a volume-limited cross section for kaon production and annihilation is simulated within two different transport prescriptions for realizing the inelastic collisions. It is found that both models can indeed dynamically account for the canonical suppression in the yields of rare strange particles. |
1801.05813 | Fabrizio Nesti | Miha Nemev\v{s}ek, Fabrizio Nesti, Goran Popara | Keung-Senjanovi\'c process at LHC: from LNV to displaced vertices to
invisible decays | Added references, minor polishing | Phys. Rev. D 97, 115018 (2018) | 10.1103/PhysRevD.97.115018 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of Left-Right symmetry, we revisit the Keung-Senjanovi\'{c}
production of right-handed $W_R$ bosons and heavy neutrinos $N$ at high energy
colliders. We develop a multi-binned sensitivity measure and use it to estimate
the sensitivity for the entire range of $N$ masses, spanning the standard and
merged prompt signals, displaced vertices and the invisible $N$ region. The
estimated sensitivity of the LHC with 300/fb integrated luminosity ranges from
5 to beyond 7 TeV, while the future 33(100) TeV collider's reach with 3/ab
extends to 12(26) TeV.
| [
{
"created": "Wed, 17 Jan 2018 19:00:12 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Mar 2018 14:22:10 GMT",
"version": "v2"
}
] | 2018-06-20 | [
[
"Nemevšek",
"Miha",
""
],
[
"Nesti",
"Fabrizio",
""
],
[
"Popara",
"Goran",
""
]
] | In the context of Left-Right symmetry, we revisit the Keung-Senjanovi\'{c} production of right-handed $W_R$ bosons and heavy neutrinos $N$ at high energy colliders. We develop a multi-binned sensitivity measure and use it to estimate the sensitivity for the entire range of $N$ masses, spanning the standard and merged prompt signals, displaced vertices and the invisible $N$ region. The estimated sensitivity of the LHC with 300/fb integrated luminosity ranges from 5 to beyond 7 TeV, while the future 33(100) TeV collider's reach with 3/ab extends to 12(26) TeV. |
2203.06349 | Xi Tong | Xi Tong and Zhong-Zhi Xianyu | Large Spin-2 Signals at the Cosmological Collider | 43 pages, 13 figures | null | 10.1007/JHEP10(2022)194 | null | hep-ph astro-ph.CO gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We study the theory and phenomenology of massive spin-2 fields during the
inflation with nonzero background chemical potential, and extend the
cosmological collider physics to tensor modes. We identify a unique dimension-5
and parity-violating chemical potential operator for massive spin-2 fields,
which leads to a ghost-free linear theory propagating one scalar mode and two
tensor modes. The chemical potential greatly boosts the production of one
tensor mode even for very heavy spin-2 particles, and thereby leads to large
and distinct cosmological collider signals for massive spin-2 particles. The
large signals show up at the tree-level in both the curvature trispectrum and
the tensor-curvature mixed bispectrum.
| [
{
"created": "Sat, 12 Mar 2022 05:01:34 GMT",
"version": "v1"
}
] | 2022-11-23 | [
[
"Tong",
"Xi",
""
],
[
"Xianyu",
"Zhong-Zhi",
""
]
] | We study the theory and phenomenology of massive spin-2 fields during the inflation with nonzero background chemical potential, and extend the cosmological collider physics to tensor modes. We identify a unique dimension-5 and parity-violating chemical potential operator for massive spin-2 fields, which leads to a ghost-free linear theory propagating one scalar mode and two tensor modes. The chemical potential greatly boosts the production of one tensor mode even for very heavy spin-2 particles, and thereby leads to large and distinct cosmological collider signals for massive spin-2 particles. The large signals show up at the tree-level in both the curvature trispectrum and the tensor-curvature mixed bispectrum. |
0805.3994 | Daniele Binosi | D. Binosi, J. Papavassiliou | New Schwinger-Dyson equations for non-Abelian gauge theories | 84 pages, 29 figures; v.4 more typos corrected | JHEP 0811:063,2008 | 10.1088/1126-6708/2008/11/063 | ECT*-08-05 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the application of the pinch technique to the conventional
Schwinger-Dyson equations for the gluon propagator, gluon-quark vertex, and
three-gluon vertex, gives rise to new equations endowed with special
properties. The new series coincides with the one obtained in the Feynman gauge
of the background field method, thus capturing the extensive gauge
cancellations implemented by the pinch technique at the level of individual
Green's functions. Its building blocks are the fully dressed pinch technique
Green's functions obeying Abelian all-order Ward identities instead of the
Slavnov-Taylor identites satisfied by their conventional counterparts. As a
result, and contrary to the standard case, the new series can be truncated
gauge invariantly at any order in the dressed loop expansion. The construction
is streamlined by resorting to the Batalin-Vilkovisky formalism which allows
for a concise treatment of all the quantities appearing in the intermediate
steps. The theoretical and phenomenological implications of this novel
non-perturbative framework are discussed in detail.
| [
{
"created": "Mon, 26 May 2008 17:18:59 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Jun 2008 17:37:12 GMT",
"version": "v2"
},
{
"created": "Mon, 31 Aug 2009 09:17:23 GMT",
"version": "v3"
},
{
"created": "Tue, 19 Jul 2011 10:10:16 GMT",
"version": "v4"
}
] | 2011-07-20 | [
[
"Binosi",
"D.",
""
],
[
"Papavassiliou",
"J.",
""
]
] | We show that the application of the pinch technique to the conventional Schwinger-Dyson equations for the gluon propagator, gluon-quark vertex, and three-gluon vertex, gives rise to new equations endowed with special properties. The new series coincides with the one obtained in the Feynman gauge of the background field method, thus capturing the extensive gauge cancellations implemented by the pinch technique at the level of individual Green's functions. Its building blocks are the fully dressed pinch technique Green's functions obeying Abelian all-order Ward identities instead of the Slavnov-Taylor identites satisfied by their conventional counterparts. As a result, and contrary to the standard case, the new series can be truncated gauge invariantly at any order in the dressed loop expansion. The construction is streamlined by resorting to the Batalin-Vilkovisky formalism which allows for a concise treatment of all the quantities appearing in the intermediate steps. The theoretical and phenomenological implications of this novel non-perturbative framework are discussed in detail. |
hep-ph/9504312 | null | Yosef Nir | Gauge Unification, Yukawa Hierarchy and the $\mu$ Problem | 7 pages, harvmac | Phys.Lett. B354 (1995) 107-110 | 10.1016/0370-2693(95)00619-V | WIS-95/18/Apr-PH | hep-ph | null | The hierarchy in the Yukawa couplings may be the result of a gauged
horizontal $U(1)_H$ symmetry. If the mixed anomalies of the Standard Model
gauge group with $U(1)_H$ are cancelled by a Green-Schwarz mechanism, a
relation between the gauge couplings, the Yukawa couplings and the $\mu$-term
arises. Assuming that at a high energy scale $g_3^2=g_2^2={5\over3}g_1^2$ and
$(m_e m_\mu m_\tau)/(m_d m_s m_b)\sim \lambda$ (where $\lambda$ is of the order
of the Cabibbo angle), the $U(1)_H$ symmetry solves the $\mu$-problem with
$\mu\sim\lambda m_{3/2}$.
| [
{
"created": "Mon, 17 Apr 1995 06:15:49 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Nir",
"Yosef",
""
]
] | The hierarchy in the Yukawa couplings may be the result of a gauged horizontal $U(1)_H$ symmetry. If the mixed anomalies of the Standard Model gauge group with $U(1)_H$ are cancelled by a Green-Schwarz mechanism, a relation between the gauge couplings, the Yukawa couplings and the $\mu$-term arises. Assuming that at a high energy scale $g_3^2=g_2^2={5\over3}g_1^2$ and $(m_e m_\mu m_\tau)/(m_d m_s m_b)\sim \lambda$ (where $\lambda$ is of the order of the Cabibbo angle), the $U(1)_H$ symmetry solves the $\mu$-problem with $\mu\sim\lambda m_{3/2}$. |
hep-ph/0009218 | Stefan Groote | S. Groote, J.G. K\"orner and A.A. Pivovarov | Analytical calculation of heavy baryon correlators in NLO of
perturbative QCD | 16 pages in LaTeX, including 7 Postscript figures, contribution to
the "VII International Workshop on Advanced Computing and Analysis Techniques
in Physics Research (ACAT2000)", Oct 16-20, 2000, Fermi National Laboratory,
Batavia, Illinois, USA, to appear in the proceedings | null | 10.1063/1.1405327 | MZ-TH/00-41, CLNS 00/1693 | hep-ph | null | We present analytical next-to-leading order results for the correlator of
baryonic currents at the three-loop level with one finite mass quark. We obtain
the massless and the HQET limits of the correlator as particular cases from the
general formula, we also give explicit expressions for the moments of the
spectral density. Calculations have been performed with an extensive use of the
symbolic manipulation programs MATHEMATICA and REDUCE.
| [
{
"created": "Tue, 19 Sep 2000 10:56:34 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Groote",
"S.",
""
],
[
"Körner",
"J. G.",
""
],
[
"Pivovarov",
"A. A.",
""
]
] | We present analytical next-to-leading order results for the correlator of baryonic currents at the three-loop level with one finite mass quark. We obtain the massless and the HQET limits of the correlator as particular cases from the general formula, we also give explicit expressions for the moments of the spectral density. Calculations have been performed with an extensive use of the symbolic manipulation programs MATHEMATICA and REDUCE. |
0904.3052 | Diego Aristizabal | D. Aristizabal Sierra, Luis Alfredo Mu\~noz, Enrico Nardi | Implications of an additional scale on leptogenesis | 9 pages, 8 figures. To appear in the proceedings of DISCRETE'08:
Symposium on Prospects in the Physics of Discrete Symmetries, Valencia,
Spain, 11-16 Dec 2008 | J.Phys.Conf.Ser.171:012078,2009 | 10.1088/1742-6596/171/1/012078 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider variations of the standard leptogenesis picture arising from the
presence of an additional scale related to the breaking of a $U(1)_X$ abelian
flavor symmetry. We show that quite generically the presence of an additional
energy scale might introduce new qualitative and quantitative changes on
leptogenesis. Especially interesting is the possibility of having succesful TeV
leptogenesis with a vanishing total CP violating asymmetry. By solving the
corresponding Boltzmann equations it is shown that these kind of scenarios
encounters no difficulties in generating the Cosmic baryon asymmetry.
| [
{
"created": "Mon, 20 Apr 2009 15:03:51 GMT",
"version": "v1"
}
] | 2009-07-22 | [
[
"Sierra",
"D. Aristizabal",
""
],
[
"Muñoz",
"Luis Alfredo",
""
],
[
"Nardi",
"Enrico",
""
]
] | We consider variations of the standard leptogenesis picture arising from the presence of an additional scale related to the breaking of a $U(1)_X$ abelian flavor symmetry. We show that quite generically the presence of an additional energy scale might introduce new qualitative and quantitative changes on leptogenesis. Especially interesting is the possibility of having succesful TeV leptogenesis with a vanishing total CP violating asymmetry. By solving the corresponding Boltzmann equations it is shown that these kind of scenarios encounters no difficulties in generating the Cosmic baryon asymmetry. |
1207.5225 | Singh N.Nimai | C. Duarah, A. Das and N. Nimai Singh | Charged lepton contributions to bimaximal and tri-bimaximal mixings for
generating $\sin\theta_{13}\neq 0$ and $\tan^2\theta_{23}<1$ | 16 pages, four figures, revised version, accepted in Physics Letter B | null | 10.1016/j.physletb.2012.10.033 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Bimaximal (BM) and tri-bimaximal (TB) mixings of neutrinos are two special
cases of lepton mixing matrix, which predict the reactor angle $\theta_{13}=0$
and the atmospheric angle $\tan^2\theta_{23}=1$. Recent precision measurements
and global analysis of oscillation parameters, have confirmed a non-vanishing
value of $\theta_{13}$ as well as deviations of $\theta_{12}$ and $\theta_{23}$
from their maximal values predicted by BM or TB mixing. In this work we mainly
concentrate on $\theta_{13}$ and $\theta_{23}$ to assign $\sin\theta_{13}\neq
0$ and $\tan^2\theta_{23}<1$ with the help of charged lepton corrections
defined by $U_{PMNS}=U^{\dagger}_lU_{\nu}$. We first consider $U_{\nu}$ to be
given separately by BM and TB mixing matrices and then find the possible forms
of $U_l}$ such that the elements of PMNS matrix, finally yield
$\sin\theta_{13}\neq 0$ and $\tan^2\theta_{23}<1$. To compute the values of
mixing angles we assume the charged lepton correction to be of CKM-like. All
the mixing matrices considered here satisfy the unitarity condition to leading
order of expansion parameters. We also analyze both the mixing schemes in
presence of Dirac CP phase and find expressions for the rephasing invariant
quantity $J_{CP}$ which have been discussed in recent literature.
| [
{
"created": "Sun, 22 Jul 2012 12:59:43 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Oct 2012 09:07:17 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Duarah",
"C.",
""
],
[
"Das",
"A.",
""
],
[
"Singh",
"N. Nimai",
""
]
] | Bimaximal (BM) and tri-bimaximal (TB) mixings of neutrinos are two special cases of lepton mixing matrix, which predict the reactor angle $\theta_{13}=0$ and the atmospheric angle $\tan^2\theta_{23}=1$. Recent precision measurements and global analysis of oscillation parameters, have confirmed a non-vanishing value of $\theta_{13}$ as well as deviations of $\theta_{12}$ and $\theta_{23}$ from their maximal values predicted by BM or TB mixing. In this work we mainly concentrate on $\theta_{13}$ and $\theta_{23}$ to assign $\sin\theta_{13}\neq 0$ and $\tan^2\theta_{23}<1$ with the help of charged lepton corrections defined by $U_{PMNS}=U^{\dagger}_lU_{\nu}$. We first consider $U_{\nu}$ to be given separately by BM and TB mixing matrices and then find the possible forms of $U_l}$ such that the elements of PMNS matrix, finally yield $\sin\theta_{13}\neq 0$ and $\tan^2\theta_{23}<1$. To compute the values of mixing angles we assume the charged lepton correction to be of CKM-like. All the mixing matrices considered here satisfy the unitarity condition to leading order of expansion parameters. We also analyze both the mixing schemes in presence of Dirac CP phase and find expressions for the rephasing invariant quantity $J_{CP}$ which have been discussed in recent literature. |
hep-ph/0508167 | Jan Kalinowski | Jan Kalinowski | SUSY Studies | Invited talk at 2005 International Linear Collider Workshop, Stanford
Ca (LCWS05), PSN 0016, 10 pages, 7 figures, LaTeX, v2: references updated | null | null | null | hep-ph | null | This report summarizes the progress in SUSY studies performed since the last
International Linear Collider Workshop in Paris (LCWS04).
| [
{
"created": "Mon, 15 Aug 2005 22:56:13 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Aug 2005 21:16:03 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Kalinowski",
"Jan",
""
]
] | This report summarizes the progress in SUSY studies performed since the last International Linear Collider Workshop in Paris (LCWS04). |
hep-ph/9612473 | Timur | A.A. Bolokhov (1), T.A. Bolokhov (1), I.S. Manida (1), M.V. Polyakov
(2) and S.G. Sherman (2) ((1) St. Petersburg State University, (2) St.
Petersburg Nuclear Physics Institute) | Cross-Symmetric Expansion of $\pi \pi$ Amplitude Near Threshold | 17 pages, Latex (uses psfig.sty), 1 Postscript figure, submitted to
YaF | Phys.Atom.Nucl. 60 (1997) 1511-1521; Yad.Fiz. 60N9 (1997)
1658-1668 | null | SPbU-IP-96-39 | hep-ph | null | The near-threshold expansion of the $\pi \pi$ amplitude is developed using
the crossing-covariant independent variables. The independent threshold
parameters entering the real part of the amplitude in an explicitly
Lorentz-invariant way are free from restrictions of isotopic and crossing
symmetries. Parameters of the expansion of the imaginary part are recovered by
the perturbative unitarity relations.
| [
{
"created": "Fri, 27 Dec 1996 12:56:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bolokhov",
"A. A.",
""
],
[
"Bolokhov",
"T. A.",
""
],
[
"Manida",
"I. S.",
""
],
[
"Polyakov",
"M. V.",
""
],
[
"Sherman",
"S. G.",
""
]
] | The near-threshold expansion of the $\pi \pi$ amplitude is developed using the crossing-covariant independent variables. The independent threshold parameters entering the real part of the amplitude in an explicitly Lorentz-invariant way are free from restrictions of isotopic and crossing symmetries. Parameters of the expansion of the imaginary part are recovered by the perturbative unitarity relations. |
2209.03303 | Michael E. Peskin | Michael E. Peskin | Model-Agnostic Exploration of the Mass Reach of Precision Higgs Boson
Coupling Measurements | 21 pages, 6 figures; submitted to the proceedings of the US Community
Study on the Future of Particle Physics (Snowmass 2021); v3: references added
and minor corrections | null | null | SLAC-PUB-17701 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To understand the possibility for precision Higgs boson coupling measurements
to access effects of very heavy new particles, I present five scenarios in
which significant deviations in Higgs boson couplings are produced by new
particles with multi-TeV masses. These scenarios indicate that such precision
measurements provide opportunities to reach well beyond the capabilities of
direct particle searches at the HL-LHC.
| [
{
"created": "Wed, 7 Sep 2022 17:08:18 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Sep 2022 22:43:15 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Oct 2022 19:38:09 GMT",
"version": "v3"
}
] | 2022-10-05 | [
[
"Peskin",
"Michael E.",
""
]
] | To understand the possibility for precision Higgs boson coupling measurements to access effects of very heavy new particles, I present five scenarios in which significant deviations in Higgs boson couplings are produced by new particles with multi-TeV masses. These scenarios indicate that such precision measurements provide opportunities to reach well beyond the capabilities of direct particle searches at the HL-LHC. |
hep-ph/9703381 | Howard Haber | Howard E. Haber | Future Directions in Higgs Phenomenology | 13 pages, LaTeX (with style file ringberg.sty included) | null | null | SCIPP 97/07 | hep-ph | null | The search for the weakly-coupled Higgs sector at future colliders consists
of three phases: discovery of a Higgs candidate, verification of the Higgs
interpretation of the signal, and precision measurements of Higgs sector
properties. The discovery of one Higgs boson with Standard Model properties is
not sufficient to expose the underlying structure of the electroweak symmetry
breaking dynamics. It is critical to search for evidence for a non-minimal
Higgs sector and/or new physics associated with electroweak symmetry breaking
dynamics.
| [
{
"created": "Fri, 21 Mar 1997 09:15:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Haber",
"Howard E.",
""
]
] | The search for the weakly-coupled Higgs sector at future colliders consists of three phases: discovery of a Higgs candidate, verification of the Higgs interpretation of the signal, and precision measurements of Higgs sector properties. The discovery of one Higgs boson with Standard Model properties is not sufficient to expose the underlying structure of the electroweak symmetry breaking dynamics. It is critical to search for evidence for a non-minimal Higgs sector and/or new physics associated with electroweak symmetry breaking dynamics. |
hep-ph/0507196 | Ahmad Idilbi S | Ahmad Idilbi, Xiangdong Ji and Feng Yuan | Transverse Momentum Distribution Through Soft-Gluon Resummation in
Effective Field Theory | 13 pages, one figure | Phys.Lett. B625 (2005) 253-263 | 10.1016/j.physletb.2005.08.038 | null | hep-ph | null | We study resummation of transverse-momentum-related large logarithms
generated from soft-gluon radiations in soft-collinear effective field theory.
The anomalous dimensions of the effective quark and gluon currents, an
important ingredient for the resummation, are calculated to two-loop order. the
result at next-to-leading-log reproduces that obtained using the standard
method for deep-inelastic scattering, Drell-Yan process, and Higgs production
through gluon-gluon fusion. We comment on the extension of the calculation to
next-to-next-to-leading logarithms.
| [
{
"created": "Fri, 15 Jul 2005 18:14:21 GMT",
"version": "v1"
}
] | 2010-04-05 | [
[
"Idilbi",
"Ahmad",
""
],
[
"Ji",
"Xiangdong",
""
],
[
"Yuan",
"Feng",
""
]
] | We study resummation of transverse-momentum-related large logarithms generated from soft-gluon radiations in soft-collinear effective field theory. The anomalous dimensions of the effective quark and gluon currents, an important ingredient for the resummation, are calculated to two-loop order. the result at next-to-leading-log reproduces that obtained using the standard method for deep-inelastic scattering, Drell-Yan process, and Higgs production through gluon-gluon fusion. We comment on the extension of the calculation to next-to-next-to-leading logarithms. |
1902.09336 | Bin Yan | Qing-Hong Cao, Peng Sun, Bin Yan, C.-P. Yuan and Feng Yuan | Soft Gluon Resummation in $t$-channel single top quark production at the
LHC | 22 pages. arXiv admin note: substantial text overlap with
arXiv:1801.09656, arXiv:1811.01428 | null | null | MSUHEP-19-004 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a detailed phenomenological study of the multiple soft gluon
radiation for the $t$-channel single top and anti-top quark production at the
Large Hadron Collider (LHC). By applying the transverse momentum dependent
factorization formalism, large logarithms introduced by small total transverse
momentum $q_\perp$ of the single-top (anti-top) plus one-jet final state system
are resummed to all orders in the expansion of the strong interaction coupling
at the accuracy of Next-to-Leading Logarithm. We discuss various kinematical
distributions which are sensitive to this effect and find that soft gluon
radiation become more important when the final state jet is required to be in
the forward region. We show that the main difference from PYTHIA prediction
lies on the inclusion of the exact color coherence effect between the initial
and final states in our resummation calculation. We further propose to apply
the experimental observable $\phi^*$ to test the effect of multiple gluon
radiation in the single-top and anti-top events. The bottom quark mass effect
and jet rapidity distribution are also discussed.
| [
{
"created": "Fri, 22 Feb 2019 17:21:32 GMT",
"version": "v1"
}
] | 2019-02-26 | [
[
"Cao",
"Qing-Hong",
""
],
[
"Sun",
"Peng",
""
],
[
"Yan",
"Bin",
""
],
[
"Yuan",
"C. -P.",
""
],
[
"Yuan",
"Feng",
""
]
] | We present a detailed phenomenological study of the multiple soft gluon radiation for the $t$-channel single top and anti-top quark production at the Large Hadron Collider (LHC). By applying the transverse momentum dependent factorization formalism, large logarithms introduced by small total transverse momentum $q_\perp$ of the single-top (anti-top) plus one-jet final state system are resummed to all orders in the expansion of the strong interaction coupling at the accuracy of Next-to-Leading Logarithm. We discuss various kinematical distributions which are sensitive to this effect and find that soft gluon radiation become more important when the final state jet is required to be in the forward region. We show that the main difference from PYTHIA prediction lies on the inclusion of the exact color coherence effect between the initial and final states in our resummation calculation. We further propose to apply the experimental observable $\phi^*$ to test the effect of multiple gluon radiation in the single-top and anti-top events. The bottom quark mass effect and jet rapidity distribution are also discussed. |
hep-ph/9807552 | Haba Naoyuki | Naoyuki Haba | Composite model with neutrino large mixing | 20 pages, Latex, no figures | Phys.Rev.D59:035011,1999 | 10.1103/PhysRevD.59.035011 | null | hep-ph | null | We suggest a simple composite model that induces the large flavor mixing of
neutrino in the supersymmetric theory. This model has only one hyper-color in
addition to the standard gauge group, which makes composite states of preons.
In this model, {\bf 10} and {\bf 1} representations in SU(5) grand unified
theory are composite states and produce the mass hierarchy. This explains why
the large mixing is realized in the lepton sector, while the small mixing is
realized in the quark sector. This model can naturally solve the atmospheric
neutrino problem. We can also solve the solar neutrino problem by improving the
model.
| [
{
"created": "Thu, 30 Jul 1998 12:32:26 GMT",
"version": "v1"
}
] | 2011-03-10 | [
[
"Haba",
"Naoyuki",
""
]
] | We suggest a simple composite model that induces the large flavor mixing of neutrino in the supersymmetric theory. This model has only one hyper-color in addition to the standard gauge group, which makes composite states of preons. In this model, {\bf 10} and {\bf 1} representations in SU(5) grand unified theory are composite states and produce the mass hierarchy. This explains why the large mixing is realized in the lepton sector, while the small mixing is realized in the quark sector. This model can naturally solve the atmospheric neutrino problem. We can also solve the solar neutrino problem by improving the model. |
hep-ph/9705349 | Alexander Ignatiev | A.Yu.Ignatiev and G.C.Joshi | Electron-positron annihilation into Dirac magnetic monopole and
antimonopole: the string ambiguity and the discrete symmetries | 14 pages, revtex, 3 figures | Mod.Phys.Lett. A13 (1998) 2295-2304 | 10.1142/S0217732398002448 | UM-P-97/12, RCHEP-97/3 | hep-ph hep-th | null | We address the problem of string arbitrariness in the quantum field theory of
Dirac magnetic monopoles. Different prescriptions are shown to yield different
physical results. The constraints due to the discrete symmetries (C and P) are
derived for the process of electron- positron annihilation into the
monopole-antimonopole pair. In the case of the annihilation through the
one-photon channel, the production of spin 0 monopoles is absolutely forbidden;
spin 1/2 monopole and antimonopole should have the same helicities (or,
equivalently, the monopole-antimonopole state should be p-wave $^1P_1$).
| [
{
"created": "Mon, 19 May 1997 02:20:45 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Ignatiev",
"A. Yu.",
""
],
[
"Joshi",
"G. C.",
""
]
] | We address the problem of string arbitrariness in the quantum field theory of Dirac magnetic monopoles. Different prescriptions are shown to yield different physical results. The constraints due to the discrete symmetries (C and P) are derived for the process of electron- positron annihilation into the monopole-antimonopole pair. In the case of the annihilation through the one-photon channel, the production of spin 0 monopoles is absolutely forbidden; spin 1/2 monopole and antimonopole should have the same helicities (or, equivalently, the monopole-antimonopole state should be p-wave $^1P_1$). |
1709.01883 | Heather E. Logan | Heather E. Logan and Mark B. Reimer (Carleton U.) | Characterizing a benchmark scenario for heavy Higgs boson searches in
the Georgi-Machacek model | 18 pages, 18 figures. v2: title changed, refs added, discussion
clarified, version accepted by PRD | Phys. Rev. D 96, 095029 (2017) | 10.1103/PhysRevD.96.095029 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Georgi-Machacek model is used to motivate and interpret LHC searches for
doubly- and singly-charged Higgs bosons decaying into vector boson pairs. In
this paper we study the constraints on and phenomenology of the "H5plane"
benchmark scenario in the Georgi-Machacek model, which has been proposed for
use in these searches. We show that the entire H5plane benchmark is compatible
with the LHC measurements of the 125 GeV Higgs boson couplings. We also point
out that, over much of the H5plane benchmark, the lineshapes of the two CP-even
neutral heavy Higgs bosons $H$ and $H_5^0$ will overlap and interfere when
produced in vector boson fusion with decays to $W^+W^-$ or $ZZ$. Finally we
compute the decay branching ratios of the additional heavy Higgs bosons within
the H5plane benchmark to facilitate the development of search strategies for
these additional particles.
| [
{
"created": "Wed, 6 Sep 2017 16:35:42 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Oct 2017 21:54:11 GMT",
"version": "v2"
}
] | 2017-12-06 | [
[
"Logan",
"Heather E.",
"",
"Carleton U."
],
[
"Reimer",
"Mark B.",
"",
"Carleton U."
]
] | The Georgi-Machacek model is used to motivate and interpret LHC searches for doubly- and singly-charged Higgs bosons decaying into vector boson pairs. In this paper we study the constraints on and phenomenology of the "H5plane" benchmark scenario in the Georgi-Machacek model, which has been proposed for use in these searches. We show that the entire H5plane benchmark is compatible with the LHC measurements of the 125 GeV Higgs boson couplings. We also point out that, over much of the H5plane benchmark, the lineshapes of the two CP-even neutral heavy Higgs bosons $H$ and $H_5^0$ will overlap and interfere when produced in vector boson fusion with decays to $W^+W^-$ or $ZZ$. Finally we compute the decay branching ratios of the additional heavy Higgs bosons within the H5plane benchmark to facilitate the development of search strategies for these additional particles. |
2211.03504 | Heikki M\"antysaari | Henri H\"anninen and Heikki M\"antysaari and Risto Paatelainen and
Jani Penttala | Proton structure functions at NLO in the dipole picture with massive
quarks | 7 pages, 3 figures, v2 matches published version | Phys.Rev.Lett. 130 (2023) 19, 192301 | 10.1103/PhysRevLett.130.192301 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | We predict heavy quark production cross sections in Deep Inelastic Scattering
at high energy by applying the Color Glass Condensate effective theory. We
demonstrate that when the calculation is performed consistently at
next-to-leading order accuracy with massive quarks it becomes possible, for the
first time in the dipole picture with perturbatively calculated center-of-mass
energy evolution, to simultaneously describe both light and heavy quark
production data at small $x_\mathrm{Bj}$. We furthermore show how the heavy
quark cross section data provides additional strong constraints on the
extracted non-perturbative initial condition for the small-$x_\mathrm{Bj}$
evolution equations.
| [
{
"created": "Mon, 7 Nov 2022 12:51:01 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jun 2023 04:50:57 GMT",
"version": "v2"
}
] | 2023-06-27 | [
[
"Hänninen",
"Henri",
""
],
[
"Mäntysaari",
"Heikki",
""
],
[
"Paatelainen",
"Risto",
""
],
[
"Penttala",
"Jani",
""
]
] | We predict heavy quark production cross sections in Deep Inelastic Scattering at high energy by applying the Color Glass Condensate effective theory. We demonstrate that when the calculation is performed consistently at next-to-leading order accuracy with massive quarks it becomes possible, for the first time in the dipole picture with perturbatively calculated center-of-mass energy evolution, to simultaneously describe both light and heavy quark production data at small $x_\mathrm{Bj}$. We furthermore show how the heavy quark cross section data provides additional strong constraints on the extracted non-perturbative initial condition for the small-$x_\mathrm{Bj}$ evolution equations. |
hep-ph/0001208 | Gabriela Barenboim | G.Barenboim, F.Scheck (Mainz) | CP Violation with Three Oscillating Neutrino Flavours | 12 pages, 4 postscript figures (eps), to appear in Phys. Lett. B | Phys.Lett. B475 (2000) 95-103 | 10.1016/S0370-2693(00)00068-X | null | hep-ph | null | We explore the prospects of observing leptonic CP violation in a neutrino
factory in the context of a scenario with three strongly oscillating neutrinos
able to account for the solar, the atmospheric and the LSND results. We address
also the problems related with the fake asymmetries induced by the experimental
device and by the presence of matter.
| [
{
"created": "Thu, 20 Jan 2000 09:32:38 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Barenboim",
"G.",
"",
"Mainz"
],
[
"Scheck",
"F.",
"",
"Mainz"
]
] | We explore the prospects of observing leptonic CP violation in a neutrino factory in the context of a scenario with three strongly oscillating neutrinos able to account for the solar, the atmospheric and the LSND results. We address also the problems related with the fake asymmetries induced by the experimental device and by the presence of matter. |
0805.0271 | Paolo Gambino | Paolo Gambino and Paolo Giordano | Normalizing inclusive rare B decays | 11 pages, 1 fig; minor numerical changes, text improved, matches
version to appear in PLB | Phys.Lett.B669:69-73,2008 | 10.1016/j.physletb.2008.09.046 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The inclusive semileptonic branching ratio is often employed to normalize
other inclusive B decays. Using recent determinations of the non-perturbative
parameters of the Operator Product Expansion we compute the normalization
factor for the branching ratio of B->X_s gamma and find a few percent
enhancement with respect to previous determinations.
| [
{
"created": "Fri, 2 May 2008 17:39:34 GMT",
"version": "v1"
},
{
"created": "Fri, 2 May 2008 21:38:07 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Sep 2008 10:45:22 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Gambino",
"Paolo",
""
],
[
"Giordano",
"Paolo",
""
]
] | The inclusive semileptonic branching ratio is often employed to normalize other inclusive B decays. Using recent determinations of the non-perturbative parameters of the Operator Product Expansion we compute the normalization factor for the branching ratio of B->X_s gamma and find a few percent enhancement with respect to previous determinations. |
1908.07192 | Zhi-Long Han | Zhi-Long Han, Ran Ding, Su-Jie Lin, Bin Zhu | Gauged $U(1)_{L_\mu-L_\tau}$ Scotogenic Model in light of $R_{K^{(*)}}$
Anomaly and AMS-02 Positron Excess | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the gauged $U(1)_{L_\mu-L_\tau}$ scotogenic model with emphasis on
latest measurement of LHCb $R_{K^{(*)}}$ anomaly and AMS-02 positron excess. In
this model, neutrino masses are induced at one-loop level with $Z_2$-odd
particles, i.e., right-handed neutrinos $N_\ell(\ell=e,\mu,\tau)$ and inert
scalar doublet $\eta$ inside the loop. Meanwhile, the gauged
$U(1)_{L_\mu-L_\tau}$ symmetry is broken spontaneously by the scalar singlet
$S$, resulting to the massive gauge boson $Z'$. Provided certain couplings to
quarks induced by heavy vector-like quarks, the gauge boson $Z'$ would
contribute to the transition $b\to s \mu^+\mu^-$, hence explain the
$R_{K^{(*)}}$ anomaly. As for the Majorana fermion DM $N$, the gauge boson $Z'$
and the singlet Higgs $H_0$ will generate various annihilation channels, among
which the $NN\to Z'Z'$ and $NN\to Z'H_0(\to Z'Z')$ channel could be used to
interpret the AMS-02 positron excess. We give a comprehensive analysis on model
parameter space with consider various current constraints. The combined
analysis shows that the $R_{K^{(*)}}$ anomaly and AMS-02 positron excess can be
explained simultaneously.
| [
{
"created": "Tue, 20 Aug 2019 07:08:41 GMT",
"version": "v1"
}
] | 2019-08-21 | [
[
"Han",
"Zhi-Long",
""
],
[
"Ding",
"Ran",
""
],
[
"Lin",
"Su-Jie",
""
],
[
"Zhu",
"Bin",
""
]
] | We study the gauged $U(1)_{L_\mu-L_\tau}$ scotogenic model with emphasis on latest measurement of LHCb $R_{K^{(*)}}$ anomaly and AMS-02 positron excess. In this model, neutrino masses are induced at one-loop level with $Z_2$-odd particles, i.e., right-handed neutrinos $N_\ell(\ell=e,\mu,\tau)$ and inert scalar doublet $\eta$ inside the loop. Meanwhile, the gauged $U(1)_{L_\mu-L_\tau}$ symmetry is broken spontaneously by the scalar singlet $S$, resulting to the massive gauge boson $Z'$. Provided certain couplings to quarks induced by heavy vector-like quarks, the gauge boson $Z'$ would contribute to the transition $b\to s \mu^+\mu^-$, hence explain the $R_{K^{(*)}}$ anomaly. As for the Majorana fermion DM $N$, the gauge boson $Z'$ and the singlet Higgs $H_0$ will generate various annihilation channels, among which the $NN\to Z'Z'$ and $NN\to Z'H_0(\to Z'Z')$ channel could be used to interpret the AMS-02 positron excess. We give a comprehensive analysis on model parameter space with consider various current constraints. The combined analysis shows that the $R_{K^{(*)}}$ anomaly and AMS-02 positron excess can be explained simultaneously. |
1003.0312 | Miguel Sanchis | Miguel-Angel Sanchis-Lozano | Comment on "New constraints of a light CP-odd Higgs boson and related
NMSSM Ideal Higgs Scenarios" by Dermisek and Gunion (arXiv:1002.1971
[hep-ph]) | 2 pages, 3 eps figures, references and comments added | null | null | FTUV-10-0301 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In two recent papers (arXiv:1002.1971 [hep-ph] and arXiv:0911.2460 [hep-ph])
Dermisek and Gunion provide new constraints on a light CP-odd Higgs boson in
the framework of the NMSSM (or similar models) based on experimental data from
LEP, CLEO, BaBar and CDF experiments. In this brief comment we argue that
special care is still needed inside a narrow mass window where mixing with
$\eta_b$ resonances below $B\bar{B}$ can occur. We also stress that observables
testing lepton universality and a possible distorsion of the bottomonium mass
spectrum can provide an alternative analysis at (Super) B-factories in the
search of such an elusive light pseudoscalar Higgs-like object.
| [
{
"created": "Mon, 1 Mar 2010 11:50:18 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Mar 2010 14:22:30 GMT",
"version": "v2"
}
] | 2010-03-11 | [
[
"Sanchis-Lozano",
"Miguel-Angel",
""
]
] | In two recent papers (arXiv:1002.1971 [hep-ph] and arXiv:0911.2460 [hep-ph]) Dermisek and Gunion provide new constraints on a light CP-odd Higgs boson in the framework of the NMSSM (or similar models) based on experimental data from LEP, CLEO, BaBar and CDF experiments. In this brief comment we argue that special care is still needed inside a narrow mass window where mixing with $\eta_b$ resonances below $B\bar{B}$ can occur. We also stress that observables testing lepton universality and a possible distorsion of the bottomonium mass spectrum can provide an alternative analysis at (Super) B-factories in the search of such an elusive light pseudoscalar Higgs-like object. |
2106.11383 | Krzysztof M. Graczyk | Krzysztof M. Graczyk and Beata E. Kowal | Model dependence of the polarization asymmetries in weak pion production
off the nucleon | 17 pages, 11 figures | Phys. Rev. D 104, 033005 (2021) | 10.1103/PhysRevD.104.033005 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The work presents the studies of the polarization observables in the single
pion production (SPP) induced by the interaction of the muon neutrino
(antineutrino) with nucleons. The SPP cross-sections and spin asymmetries are
computed within two phenomenological models. One is basing on the nonlinear
sigma model \cite{Hernandez:2007qq}; the other has origin in linear sigma
model~\cite{Fogli:1979cz}. Firstly, we show that the final nucleon polarization
and target spin asymmetries are good observables to obtain information about
the $C_5^A$ axial form factor. Secondly, we demonstrate that the nucleon
polarization and the target spin asymmetries are sensitive to the relative
phase between resonance and nonresonance amplitudes. We conclude that the
polarization of the final nucleon and the target spin asymmetry are promising
observables for testing SPP models, including studies of the axial content of
$\Delta(1232)$ resonance and unitarization procedures.
| [
{
"created": "Mon, 21 Jun 2021 19:36:31 GMT",
"version": "v1"
}
] | 2021-09-01 | [
[
"Graczyk",
"Krzysztof M.",
""
],
[
"Kowal",
"Beata E.",
""
]
] | The work presents the studies of the polarization observables in the single pion production (SPP) induced by the interaction of the muon neutrino (antineutrino) with nucleons. The SPP cross-sections and spin asymmetries are computed within two phenomenological models. One is basing on the nonlinear sigma model \cite{Hernandez:2007qq}; the other has origin in linear sigma model~\cite{Fogli:1979cz}. Firstly, we show that the final nucleon polarization and target spin asymmetries are good observables to obtain information about the $C_5^A$ axial form factor. Secondly, we demonstrate that the nucleon polarization and the target spin asymmetries are sensitive to the relative phase between resonance and nonresonance amplitudes. We conclude that the polarization of the final nucleon and the target spin asymmetry are promising observables for testing SPP models, including studies of the axial content of $\Delta(1232)$ resonance and unitarization procedures. |
2311.03536 | Xuheng Luo | Xuheng Luo and Anubhav Mathur | Cosmic Birefringence from CP-Violating Axion Interactions | Published version | JHEP 08 (2024) 038 | 10.1007/JHEP08(2024)038 | null | hep-ph astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We explore the cosmic birefringence signal produced by an ultralight axion
field with a small CP-violating coupling to bulk SM matter in addition to the
usual CP-preserving photon coupling. The change in the vacuum expectation value
of the field between recombination and today results in a frequency-independent
rotation of the plane of CMB linear polarization across the entire sky. While
many previous approaches rely on the axion rolling from a large initial
expectation value, the couplings considered in this work robustly generate the
birefringence signal regardless of initial conditions, by sourcing the field
from the cosmological nucleon density. We place bounds on such monopole-dipole
interactions using measurements of the birefringence angle from Planck and WMAP
data, which improve upon existing constraints by up to three orders of
magnitude. We also discuss UV completions of this model, and possible
strategies to avoid fine-tuning the axion mass.
| [
{
"created": "Mon, 6 Nov 2023 21:18:02 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Aug 2024 18:36:03 GMT",
"version": "v2"
}
] | 2024-08-14 | [
[
"Luo",
"Xuheng",
""
],
[
"Mathur",
"Anubhav",
""
]
] | We explore the cosmic birefringence signal produced by an ultralight axion field with a small CP-violating coupling to bulk SM matter in addition to the usual CP-preserving photon coupling. The change in the vacuum expectation value of the field between recombination and today results in a frequency-independent rotation of the plane of CMB linear polarization across the entire sky. While many previous approaches rely on the axion rolling from a large initial expectation value, the couplings considered in this work robustly generate the birefringence signal regardless of initial conditions, by sourcing the field from the cosmological nucleon density. We place bounds on such monopole-dipole interactions using measurements of the birefringence angle from Planck and WMAP data, which improve upon existing constraints by up to three orders of magnitude. We also discuss UV completions of this model, and possible strategies to avoid fine-tuning the axion mass. |
hep-ph/9607415 | null | Yosef Nir | On Supersymmetric CP Violation | 16 pages, uses harvmac | null | null | WIS-96/31/Jul-PH | hep-ph | null | We discuss the discovery potential for New Physics of various measurements of
CP violation. If nature is supersymmetric, then the flavor problem is even more
mysterious than in the standard model. We show how we can learn about the
mechanism that solves the supersymmetric flavor problem from measurements of
mixing and CP violation in $K$, $D$ and $B$ decays. (Invited talk given at the
Workshop on K Physics, Orsay, France, May 30 - June 4, 1996.)
| [
{
"created": "Wed, 24 Jul 1996 13:03:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nir",
"Yosef",
""
]
] | We discuss the discovery potential for New Physics of various measurements of CP violation. If nature is supersymmetric, then the flavor problem is even more mysterious than in the standard model. We show how we can learn about the mechanism that solves the supersymmetric flavor problem from measurements of mixing and CP violation in $K$, $D$ and $B$ decays. (Invited talk given at the Workshop on K Physics, Orsay, France, May 30 - June 4, 1996.) |
1610.09605 | Takayuki Matsuki | Qi-Fang L\"u, Yubing Dong, Xiang Liu, Takayuki Matsuki | Puzzle of the $\Lambda_c$ spectrum | 3 pages, 3 tables | Nucl. Phys. Rev. 35, 1-4 (2018) | 10.11804/NuclPhysRev.35.01.001 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There is a puzzle in the $\Lambda_c^+$ family, i.e., one member with
$J^P=3/2^+$ is missing in a $L=2$ multiplet which the heavy quark effective
theory predicts, and $J^P$'s of $\Lambda_c(2765)^+$ and $\Lambda_c(2940)^+$ are
unknown. Using a light diquark picture to calculate baryon masses, we study
possible assignments of two $\Lambda_c$'s with unknown $J^P$ and the missing
$\Lambda_c^+$ with $3/2^+$ for $L=2$, and we find the most probable possibility
that the peak corresponding to $\Lambda_c(2880)^+$ actually includes a missing
member with spin $3/2^+$ for $L=2$ and that quantum numbers of
$\Lambda_c(2765)^+$ and $\Lambda_c(2940)^+$ are $2S(1/2^+)$ and $2P(1/2^-)$,
respectively.
| [
{
"created": "Sun, 30 Oct 2016 05:25:11 GMT",
"version": "v1"
}
] | 2018-05-08 | [
[
"Lü",
"Qi-Fang",
""
],
[
"Dong",
"Yubing",
""
],
[
"Liu",
"Xiang",
""
],
[
"Matsuki",
"Takayuki",
""
]
] | There is a puzzle in the $\Lambda_c^+$ family, i.e., one member with $J^P=3/2^+$ is missing in a $L=2$ multiplet which the heavy quark effective theory predicts, and $J^P$'s of $\Lambda_c(2765)^+$ and $\Lambda_c(2940)^+$ are unknown. Using a light diquark picture to calculate baryon masses, we study possible assignments of two $\Lambda_c$'s with unknown $J^P$ and the missing $\Lambda_c^+$ with $3/2^+$ for $L=2$, and we find the most probable possibility that the peak corresponding to $\Lambda_c(2880)^+$ actually includes a missing member with spin $3/2^+$ for $L=2$ and that quantum numbers of $\Lambda_c(2765)^+$ and $\Lambda_c(2940)^+$ are $2S(1/2^+)$ and $2P(1/2^-)$, respectively. |
2203.06237 | Daniel Britzger | Daniel Britzger, Max Klein, Hubert Spiesberger | Precision electroweak physics at the LHeC and FCC-eh | 13 pages and 6 figures, to appear in the Proceedings of the European
Physical Society Conference on High Energy Physics 2021, Hamburg, Germany,
26-30 July 2021 | PoS EPS-HEP2021 (2022) 485 | 10.22323/1.398.0485 | MPP-2021-208 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The proposed electron-proton collider experiments LHeC and FCC-eh at CERN are
the highest resolution microscopes that can be realised in the present century
and they would represent a really unique research facility. We exploit
simulated neutral-current and charged-current deep-inelastic scattering data of
the LHeC and the FCC-eh and examine their sensitivity for precision physics in
the Electroweak sector of the Standard Model (SM), like the effective weak
mixing angle $\sin^2\theta_{\textrm{W},\ell}^\textrm{eff}$, or the light-quark
weak-neutral-current couplings. Unique measurements are further feasible at
high precision for the running of the weak mixing angle, as well as for
electroweak effects in charged current interactions. The sensitivity to beyond
SM effects is studied using the generic $S$, $T$ and $U$ parameterization. The
report summarizes previous studies about the LHeC and presents new prospects
for the FCC-eh.
| [
{
"created": "Fri, 11 Mar 2022 20:39:42 GMT",
"version": "v1"
}
] | 2022-03-15 | [
[
"Britzger",
"Daniel",
""
],
[
"Klein",
"Max",
""
],
[
"Spiesberger",
"Hubert",
""
]
] | The proposed electron-proton collider experiments LHeC and FCC-eh at CERN are the highest resolution microscopes that can be realised in the present century and they would represent a really unique research facility. We exploit simulated neutral-current and charged-current deep-inelastic scattering data of the LHeC and the FCC-eh and examine their sensitivity for precision physics in the Electroweak sector of the Standard Model (SM), like the effective weak mixing angle $\sin^2\theta_{\textrm{W},\ell}^\textrm{eff}$, or the light-quark weak-neutral-current couplings. Unique measurements are further feasible at high precision for the running of the weak mixing angle, as well as for electroweak effects in charged current interactions. The sensitivity to beyond SM effects is studied using the generic $S$, $T$ and $U$ parameterization. The report summarizes previous studies about the LHeC and presents new prospects for the FCC-eh. |
hep-ph/0608303 | Frank Fugel | Frank Fugel (Hamburg U., Inst. Theor. Phys. II) | Higgs Decay to Photons at Two Loops | 8 pages, 9 figures, presented at conference "Physics at LHC", Cracow,
Poland, July 2006, added reference | ActaPhys.Polon.B38:761-768,2007 | null | null | hep-ph | null | The calculation of the two-loop corrections to the partial width of an
intermediate-mass Higgs boson decaying into a pair of photons is reviewed. The
main focus lies on the electroweak (EW) contributions. The sum of the EW
corrections ranges from -4% to 0% for a Higgs mass between 100 GeV and 150 GeV,
while the complete correction at two-loop order amounts to less than +-1.5% in
this regime.
| [
{
"created": "Tue, 29 Aug 2006 15:08:25 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Aug 2006 10:58:31 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Fugel",
"Frank",
"",
"Hamburg U., Inst. Theor. Phys. II"
]
] | The calculation of the two-loop corrections to the partial width of an intermediate-mass Higgs boson decaying into a pair of photons is reviewed. The main focus lies on the electroweak (EW) contributions. The sum of the EW corrections ranges from -4% to 0% for a Higgs mass between 100 GeV and 150 GeV, while the complete correction at two-loop order amounts to less than +-1.5% in this regime. |
0805.0318 | Thomas Dent | Thomas Dent | Eotvos bounds on couplings of fundamental parameters to gravity | To be published (Phys.Rev.Lett.), minor changes and corrections,
equivalent to journal version | Phys.Rev.Lett.101:041102,2008 | 10.1103/PhysRevLett.101.041102 | HD-THEP-08-12 | hep-ph astro-ph gr-qc physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possible dependence of fundamental couplings and mass ratios on the
gravitational potential has been bounded by comparing atomic clock frequencies
over Earth's elliptical orbit. Here we evaluate bounds on such dependence from
E"otv"os-type experiments that test the Weak Equivalence Principle, including
previously neglected contributions from nuclear binding energy. We find that
variations of fundamental parameters correlated with the gravitational
potential are bounded at 10^-8--10^-9, an improvement of 2--3 orders of
magnitude over atomic clock bounds.
| [
{
"created": "Fri, 2 May 2008 21:32:20 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Jul 2008 13:25:44 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Dent",
"Thomas",
""
]
] | The possible dependence of fundamental couplings and mass ratios on the gravitational potential has been bounded by comparing atomic clock frequencies over Earth's elliptical orbit. Here we evaluate bounds on such dependence from E"otv"os-type experiments that test the Weak Equivalence Principle, including previously neglected contributions from nuclear binding energy. We find that variations of fundamental parameters correlated with the gravitational potential are bounded at 10^-8--10^-9, an improvement of 2--3 orders of magnitude over atomic clock bounds. |
1401.6298 | Douglas Ross | Henri Kowalski, Lev Lipatov and Douglas Ross | The Green Function for the BFKL Pomeron and the Transition to DGLAP
Evolution | 14 pages, 2 figures | null | 10.1140/epjc/s10052-014-2919-y | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the (process-independent) Green function for the BFKL equation in
the next-to-leading order approximation, with running coupling, and explain
how, within the semi-classical approximation, it is related to Green function
of the Airy equation. The unique Green function is obtained from a combination
of its required ultraviolet behaviour compatible with asymptotic freedom and an
infrared limit phase imposed by the non-perturbative sector of QCD. We show
that at sufficiently large gluon transverse momenta the corresponding gluon
density matches that of the DGLAP analysis, whereas for relatively small values
of the gluon transverse momentum the gluon distribution is sensitive to the
Regge poles, whose positions are determined both by the non-pertubative QCD
dynamics and physics at large transverse momenta.
| [
{
"created": "Fri, 24 Jan 2014 09:40:56 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Kowalski",
"Henri",
""
],
[
"Lipatov",
"Lev",
""
],
[
"Ross",
"Douglas",
""
]
] | We consider the (process-independent) Green function for the BFKL equation in the next-to-leading order approximation, with running coupling, and explain how, within the semi-classical approximation, it is related to Green function of the Airy equation. The unique Green function is obtained from a combination of its required ultraviolet behaviour compatible with asymptotic freedom and an infrared limit phase imposed by the non-perturbative sector of QCD. We show that at sufficiently large gluon transverse momenta the corresponding gluon density matches that of the DGLAP analysis, whereas for relatively small values of the gluon transverse momentum the gluon distribution is sensitive to the Regge poles, whose positions are determined both by the non-pertubative QCD dynamics and physics at large transverse momenta. |
1911.10221 | Lu\'is Ventura | Jamie I.McDonald and Lu\'is B. Ventura | Optical properties of dynamical axion backgrounds | Comments are welcome | Phys. Rev. D 101, 123503 (2020) | 10.1103/PhysRevD.101.123503 | null | hep-ph astro-ph.CO gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss spectral distortions, time delays and refraction of light in an
axion or axion-plasma background. This involves solving the full set of
geodesic equations associated to the system of Hamiltonian optics, allowing us
to self-consistently take into account the evolution of the momentum, frequency
and position of photons. We support our arguments with analytic approximations
and full numerical solutions. Remarkably, the introduction of a plasma enhances
the sensitivity to axion-induced birefringence, allowing these effects to occur
at linear order in the axion-photon coupling even when the axion background is
not present at either the emission or detection points. This suggests a general
enhancement of axion-induced birefringence when the background refractive index
is different from one.
| [
{
"created": "Fri, 22 Nov 2019 19:09:59 GMT",
"version": "v1"
}
] | 2020-07-01 | [
[
"McDonald",
"Jamie I.",
""
],
[
"Ventura",
"Luís B.",
""
]
] | We discuss spectral distortions, time delays and refraction of light in an axion or axion-plasma background. This involves solving the full set of geodesic equations associated to the system of Hamiltonian optics, allowing us to self-consistently take into account the evolution of the momentum, frequency and position of photons. We support our arguments with analytic approximations and full numerical solutions. Remarkably, the introduction of a plasma enhances the sensitivity to axion-induced birefringence, allowing these effects to occur at linear order in the axion-photon coupling even when the axion background is not present at either the emission or detection points. This suggests a general enhancement of axion-induced birefringence when the background refractive index is different from one. |
1712.05168 | Leonid Glozman | L. Ya. Glozman | Chiralspin symmetry and QCD at high temperature | 3 pages, final version to appear in EPJA | null | 10.1140/epja/i2018-12560-0 | null | hep-ph hep-lat hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been found very recently on the lattice that at high temperature at
vanishing chemical potential QCD is increasingly SU(2)_CS and SU(2N_F)
symmetric. We demonstrate that the chemical potential term in the QCD
Lagrangian has precisely the same symmetry. Consequently the QCD matter beyond
the chiral restoration line on the T - \mu plane is at least approximately
SU(2)_CS and SU(2N_F) symmetric.
| [
{
"created": "Thu, 14 Dec 2017 11:01:13 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Apr 2018 17:53:13 GMT",
"version": "v2"
},
{
"created": "Sun, 24 Jun 2018 16:47:20 GMT",
"version": "v3"
}
] | 2018-08-01 | [
[
"Glozman",
"L. Ya.",
""
]
] | It has been found very recently on the lattice that at high temperature at vanishing chemical potential QCD is increasingly SU(2)_CS and SU(2N_F) symmetric. We demonstrate that the chemical potential term in the QCD Lagrangian has precisely the same symmetry. Consequently the QCD matter beyond the chiral restoration line on the T - \mu plane is at least approximately SU(2)_CS and SU(2N_F) symmetric. |
1211.0186 | Luis Anchordoqui | Luis A. Anchordoqui, Haim Goldberg, and Gary Steigman | Right-Handed Neutrinos as the Dark Radiation: Status and Forecasts for
the LHC | 5 pages revtex, 3 eps figures | null | 10.1016/j.physletb.2012.12.019 | null | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Precision data from cosmology (probing the CMB decoupling epoch) and
light-element abundances (probing the BBN epoch) have hinted at the presence of
extra relativistic degrees of freedom, the so-called "dark radiation." We
present a model independent study to account for the dark radiation by means of
the right-handed partners of the three, left-handed, standard model neutrinos.
We show that milli-weak interactions of these Dirac states (through their
coupling to a TeV-scale Z' gauge boson) may allow the \nu_R's to decouple much
earlier, at a higher temperature, than their left-handed counterparts. If the
\nu_R's decouple during the quark-hadron crossover transition, they are
considerably cooler than the \nu_L's and contribute less than 3 extra
"equivalent neutrinos" to the early Universe energy density. For decoupling in
this transition region, the 3 \nu_R generate \Delta N_\nu = 3(T_{\nu_R}/T_{\nu_
L})^4 < 3, extra relativistic degrees of freedom at BBN and at the CMB epochs.
Consistency with present constraints on dark radiation permits us to identify
the allowed region in the parameter space of Z' masses and couplings.
Remarkably, the allowed region is within the range of discovery of LHC14.
| [
{
"created": "Thu, 1 Nov 2012 14:10:06 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Anchordoqui",
"Luis A.",
""
],
[
"Goldberg",
"Haim",
""
],
[
"Steigman",
"Gary",
""
]
] | Precision data from cosmology (probing the CMB decoupling epoch) and light-element abundances (probing the BBN epoch) have hinted at the presence of extra relativistic degrees of freedom, the so-called "dark radiation." We present a model independent study to account for the dark radiation by means of the right-handed partners of the three, left-handed, standard model neutrinos. We show that milli-weak interactions of these Dirac states (through their coupling to a TeV-scale Z' gauge boson) may allow the \nu_R's to decouple much earlier, at a higher temperature, than their left-handed counterparts. If the \nu_R's decouple during the quark-hadron crossover transition, they are considerably cooler than the \nu_L's and contribute less than 3 extra "equivalent neutrinos" to the early Universe energy density. For decoupling in this transition region, the 3 \nu_R generate \Delta N_\nu = 3(T_{\nu_R}/T_{\nu_ L})^4 < 3, extra relativistic degrees of freedom at BBN and at the CMB epochs. Consistency with present constraints on dark radiation permits us to identify the allowed region in the parameter space of Z' masses and couplings. Remarkably, the allowed region is within the range of discovery of LHC14. |
hep-ph/9907534 | V. E. Rochev | V.E. Rochev | On Nonperturbative Calculations in Quantum Electrodynamics | 31 pages, Plain LaTex, no figures. Journal version: some discussion
and refs. are added | J.Phys.A33:7379-7406,2000 | 10.1088/0305-4470/33/41/309 | null | hep-ph | null | A new approach to nonperturbative calculations in quantum electrodynamics is
proposed. The approach is based on a regular iteration scheme for solution of
Schwinger-Dyson equations for generating functional of Green functions. The
approach allows one to take into account the gauge invariance conditions (Ward
identities) and to perform the renormalization program. The iteration scheme
can be realized in two versions. The first one ("perturbative vacuum")
corresponds to chain summation in the diagram language. In this version in
four-dimensional theory the non-physical singularity (Landau pole) arises which
leads to the triviality of the renormalized theory. The second version
("nonperturbative vacuum") corresponds to ladder summation and permits one to
make non-perturbative calculations of physical quantities in spite of the
triviality problem. For chiral-symmetrical leading approximation two terms of
the expansion of the first-step vertex function over photon momentum are
calculated. A formula for anomalous magnetic moment is obtained. A problem of
dynamical chiral symmetry breaking (DCSB) is considered, the calculations are
performed for renormalized theory in Minkowsky space. In the strong coupling
region DCSB-solutions arise. For the renormalized theory a DCSB-solution is
also possible in the weak coupling region but with a subsidiary condition on
the value of $\alpha$.
| [
{
"created": "Wed, 28 Jul 1999 13:49:42 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Oct 2000 07:46:55 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Rochev",
"V. E.",
""
]
] | A new approach to nonperturbative calculations in quantum electrodynamics is proposed. The approach is based on a regular iteration scheme for solution of Schwinger-Dyson equations for generating functional of Green functions. The approach allows one to take into account the gauge invariance conditions (Ward identities) and to perform the renormalization program. The iteration scheme can be realized in two versions. The first one ("perturbative vacuum") corresponds to chain summation in the diagram language. In this version in four-dimensional theory the non-physical singularity (Landau pole) arises which leads to the triviality of the renormalized theory. The second version ("nonperturbative vacuum") corresponds to ladder summation and permits one to make non-perturbative calculations of physical quantities in spite of the triviality problem. For chiral-symmetrical leading approximation two terms of the expansion of the first-step vertex function over photon momentum are calculated. A formula for anomalous magnetic moment is obtained. A problem of dynamical chiral symmetry breaking (DCSB) is considered, the calculations are performed for renormalized theory in Minkowsky space. In the strong coupling region DCSB-solutions arise. For the renormalized theory a DCSB-solution is also possible in the weak coupling region but with a subsidiary condition on the value of $\alpha$. |
0810.1362 | Genevieve Belanger | G. Belanger, E. Nezri, A.Pukhov | Discriminating dark matter candidates using direct detection | 26 pages, 7 figures | Phys.Rev.D79:015008,2009 | 10.1103/PhysRevD.79.015008 | LAPTH-1278/08 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the predictions for both the spin dependent and spin independent
direct detection rates in a variety of new particle physics models with dark
matter candidates. We show that a determination of both spin independent and
spin dependent amplitudes on protons and neutrons can in principle discriminate
different candidates of dark matter up to a few ambiguities. We emphasize the
importance of making measurements with different spin dependent sensitive
detector materials and the need for significant improvement of the detector
sensitivities. Scenarii where exchange of new coloured particles contributes
significantly to the elastic scattering cross sections are often the most
difficult to identify, the LHC should give an indication whether such scenarii
are relevant for direct detection.
| [
{
"created": "Wed, 8 Oct 2008 06:54:46 GMT",
"version": "v1"
}
] | 2009-02-26 | [
[
"Belanger",
"G.",
""
],
[
"Nezri",
"E.",
""
],
[
"Pukhov",
"A.",
""
]
] | We examine the predictions for both the spin dependent and spin independent direct detection rates in a variety of new particle physics models with dark matter candidates. We show that a determination of both spin independent and spin dependent amplitudes on protons and neutrons can in principle discriminate different candidates of dark matter up to a few ambiguities. We emphasize the importance of making measurements with different spin dependent sensitive detector materials and the need for significant improvement of the detector sensitivities. Scenarii where exchange of new coloured particles contributes significantly to the elastic scattering cross sections are often the most difficult to identify, the LHC should give an indication whether such scenarii are relevant for direct detection. |
1304.5240 | Yang-Ting Chien | Yang-Ting Chien | Telescoping Jets: Multiple Event Interpretations with Multiple R's | 4 pages, 6 figures, 1 table | Phys. Rev. D 90, 054008 (2014) | 10.1103/PhysRevD.90.054008 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Jets at high energy colliders are complicated objects to identify. Even if
jets are widely separated, there is no reason for jets to have the same size. A
single reconstruction, or interpretation, of each event can only extract a
limited amount of information. Motivated by the recently proposed Qjet
algorithms, which give multiple interpretations for each event using
nondeterministic jet clustering, we propose a simple, fast and powerful method
to give multiple event interpretations by varying the parameter R in the jet
definition. With multiple interpretations we can redefine the weight of each
event in a counting experiment to be the fraction of interpretations passing
the experimental cuts, instead of 0 or 1 in a conventional analysis. We show
that the statistical power of an analysis can be dramatically increased. In
particular, we can have a 46% improvement in the statistical significance for
the Higgs search with an associated Z boson (ZH\rightarrow \nu {\bar \nu}b
{\bar b}) at the 8 TeV LHC.
| [
{
"created": "Thu, 18 Apr 2013 20:00:02 GMT",
"version": "v1"
}
] | 2014-09-17 | [
[
"Chien",
"Yang-Ting",
""
]
] | Jets at high energy colliders are complicated objects to identify. Even if jets are widely separated, there is no reason for jets to have the same size. A single reconstruction, or interpretation, of each event can only extract a limited amount of information. Motivated by the recently proposed Qjet algorithms, which give multiple interpretations for each event using nondeterministic jet clustering, we propose a simple, fast and powerful method to give multiple event interpretations by varying the parameter R in the jet definition. With multiple interpretations we can redefine the weight of each event in a counting experiment to be the fraction of interpretations passing the experimental cuts, instead of 0 or 1 in a conventional analysis. We show that the statistical power of an analysis can be dramatically increased. In particular, we can have a 46% improvement in the statistical significance for the Higgs search with an associated Z boson (ZH\rightarrow \nu {\bar \nu}b {\bar b}) at the 8 TeV LHC. |
1809.01107 | Eugenio Megias | Marcela Carena, Eugenio Megias, Mariano Quiros, Carlos Wagner | $R_{D^{(\ast)}}$ in custodial warped space | 43 pages, 12 figures, 1 table; v2 added references; v3 typos removed
and added references. It matches the version published in Journal of High
Energy Physics | null | 10.1007/JHEP12(2018)043 | FERMILAB-PUB-18-386-T; EFI-18-9; UAB-FT-777 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Flavor physics experiments allow to probe the accuracy of the Standard Model
(SM) description at low energies, and are sensitive to new heavy gauge bosons
that couple to quarks and leptons in a relevant way. The apparent anomaly in
the ratios of the decay of $B$-mesons into $D$-mesons and different lepton
flavors, $R_{D^{(\ast)}} = \mathcal B(B \to D^{(\ast)} \tau \nu)/ \mathcal B(B
\to D^{(\ast)} \ell \nu )$ is particularly intriguing, since these decay
processes occur at tree-level in the SM. Recently, it has been suggested that
this anomaly may be explained by new gauge bosons coupled to right-handed
currents of quarks and leptons, involving light right-handed neutrinos. In this
work we present a well-motivated ultraviolet complete realization of this idea,
embedding the SM in a warped space with an $SU(2)_L \otimes SU(2)_R \otimes
U(1)_{B-L}$ bulk gauge symmetry. Besides providing a solution to the hierarchy
problem, we show that this model, which has an explicit custodial symmetry, can
explain the $R_{D^{(\ast)}}$ anomaly and at the same time allow for a solution
to the $R_{K^{(\ast)}}$ anomalies, related to the decay of $B$-mesons into
$K$-mesons and leptons, $R_{K^{(*)}} = \mathcal B(B\to K^{(*)} \mu \mu)/
\mathcal B(B \to K^{(*)} e e)$. In addition, a model prediction is an anomalous
value of the forward-backward asymmetry $A^b_{FB}$, driven by the $Z\bar b_R
b_R$ coupling, in agreement with LEP data.
| [
{
"created": "Tue, 4 Sep 2018 17:23:26 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Sep 2018 16:23:23 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Dec 2018 17:57:48 GMT",
"version": "v3"
}
] | 2018-12-26 | [
[
"Carena",
"Marcela",
""
],
[
"Megias",
"Eugenio",
""
],
[
"Quiros",
"Mariano",
""
],
[
"Wagner",
"Carlos",
""
]
] | Flavor physics experiments allow to probe the accuracy of the Standard Model (SM) description at low energies, and are sensitive to new heavy gauge bosons that couple to quarks and leptons in a relevant way. The apparent anomaly in the ratios of the decay of $B$-mesons into $D$-mesons and different lepton flavors, $R_{D^{(\ast)}} = \mathcal B(B \to D^{(\ast)} \tau \nu)/ \mathcal B(B \to D^{(\ast)} \ell \nu )$ is particularly intriguing, since these decay processes occur at tree-level in the SM. Recently, it has been suggested that this anomaly may be explained by new gauge bosons coupled to right-handed currents of quarks and leptons, involving light right-handed neutrinos. In this work we present a well-motivated ultraviolet complete realization of this idea, embedding the SM in a warped space with an $SU(2)_L \otimes SU(2)_R \otimes U(1)_{B-L}$ bulk gauge symmetry. Besides providing a solution to the hierarchy problem, we show that this model, which has an explicit custodial symmetry, can explain the $R_{D^{(\ast)}}$ anomaly and at the same time allow for a solution to the $R_{K^{(\ast)}}$ anomalies, related to the decay of $B$-mesons into $K$-mesons and leptons, $R_{K^{(*)}} = \mathcal B(B\to K^{(*)} \mu \mu)/ \mathcal B(B \to K^{(*)} e e)$. In addition, a model prediction is an anomalous value of the forward-backward asymmetry $A^b_{FB}$, driven by the $Z\bar b_R b_R$ coupling, in agreement with LEP data. |
2202.03491 | Rui-Cheng Li | Rui-Cheng Li | Scalar Bound States of $D^{\ast}\bar{D}^{\ast}$ and
$B^{\ast}\bar{B}^{\ast}$ in the Bethe-Salpeter Formalism | 34 pages, 6 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We study the scalar bound states of $D^{\ast}\bar{D}^{\ast}$ and
$B^{\ast}\bar{B}^{\ast}$ in the Bethe-Salpeter formalism, with the effective
interaction kernel extracted from the chiral perturbative theory and the heavy
quark effective theory in the ladder approximation and the covariant
instantaneous approximation. The results show that, in the scalar case ($J=0$),
there can only exist $I = 0$ bound states for parameters in proper range, while
there cannot exist the $I = 1$ bound states in the whole reasonable parameter
range, due to more constraints arising from our definition of the
Bethe-Salpeter wavefunction.
| [
{
"created": "Thu, 30 Dec 2021 20:55:54 GMT",
"version": "v1"
}
] | 2022-02-09 | [
[
"Li",
"Rui-Cheng",
""
]
] | We study the scalar bound states of $D^{\ast}\bar{D}^{\ast}$ and $B^{\ast}\bar{B}^{\ast}$ in the Bethe-Salpeter formalism, with the effective interaction kernel extracted from the chiral perturbative theory and the heavy quark effective theory in the ladder approximation and the covariant instantaneous approximation. The results show that, in the scalar case ($J=0$), there can only exist $I = 0$ bound states for parameters in proper range, while there cannot exist the $I = 1$ bound states in the whole reasonable parameter range, due to more constraints arising from our definition of the Bethe-Salpeter wavefunction. |
hep-ph/9411288 | null | F. J. Botella and Joao P. Silva | Jarlskog-like invariants for theories with scalars and fermions | 12 pages, Latex, no figures | Phys.Rev.D51:3870-3875,1995 | 10.1103/PhysRevD.51.3870 | FTUV/94-68 and IFIC/94-65 | hep-ph | null | Within the framework of theories where both scalars and fermions are present,
we develop a systematic prescription for the construction of CP-violating
quantities that are invariant under basis transformations of those matter
fields. In theories with Spontaneous Symmetry Breaking, the analysis involves
the vevs' transformation properties under a scalar basis change, with a
considerable simplification of the study of CP violation in the scalar sector.
These techniques are then applied in detail to the two Higgs-doublet model with
quarks. It is shown that there are new invariants involving scalar-fermion
interactions, besides those already derived in previous analyses for the
fermion-gauge and scalar-gauge sectors.
| [
{
"created": "Mon, 14 Nov 1994 14:11:12 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Botella",
"F. J.",
""
],
[
"Silva",
"Joao P.",
""
]
] | Within the framework of theories where both scalars and fermions are present, we develop a systematic prescription for the construction of CP-violating quantities that are invariant under basis transformations of those matter fields. In theories with Spontaneous Symmetry Breaking, the analysis involves the vevs' transformation properties under a scalar basis change, with a considerable simplification of the study of CP violation in the scalar sector. These techniques are then applied in detail to the two Higgs-doublet model with quarks. It is shown that there are new invariants involving scalar-fermion interactions, besides those already derived in previous analyses for the fermion-gauge and scalar-gauge sectors. |
hep-ph/0307309 | Nita Sinha | David London, Nita Sinha and Rahul Sinha | Determining weak phases using B->D^*V Decays | Invited talk at the Workshop on the CKM Unitarity triangle, IPP
Durham, April 2003 (eConf C0304052), 4 pages LaTex | eConf C0304052 (2003) WG421 | null | IMSc/2003/07/18 | hep-ph | null | We describe how the angular analysis of vector-vector final states in B
decays provides theoretically clean techniques for determination of CP
violating phases. The quantity $\sin^2 (2\beta + \gamma)$ can be cleanly
obtained from the time dependent study of decays such as B_d(t)->D^{*\pm}
\rho^\mp, D^{*\pm} a_1^{\mp} etc. Similarly, one can use B_s(t)-> D_s^{*\pm}
K^{*\mp} to extract $\sin^2 \gamma$. A time independent study of the charged
decay mode B^\pm-> D^{*0}(\bar D^{*0}) K^{*\pm} can also be used to extract
gamma.
| [
{
"created": "Fri, 25 Jul 2003 07:15:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"London",
"David",
""
],
[
"Sinha",
"Nita",
""
],
[
"Sinha",
"Rahul",
""
]
] | We describe how the angular analysis of vector-vector final states in B decays provides theoretically clean techniques for determination of CP violating phases. The quantity $\sin^2 (2\beta + \gamma)$ can be cleanly obtained from the time dependent study of decays such as B_d(t)->D^{*\pm} \rho^\mp, D^{*\pm} a_1^{\mp} etc. Similarly, one can use B_s(t)-> D_s^{*\pm} K^{*\mp} to extract $\sin^2 \gamma$. A time independent study of the charged decay mode B^\pm-> D^{*0}(\bar D^{*0}) K^{*\pm} can also be used to extract gamma. |
2310.10369 | Xin Wang | Stephen F. King, Xin Wang | Modulus stabilisation in the multiple-modulus framework | 32 pages, 6 figures, 3 tables | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a class of modular-invariant models with multiple moduli fields, the
viable lepton flavour mixing pattern can be realised if the values of moduli
are selected to be at the fixed points. In this paper, we investigate a modulus
stabilisation mechanism in the multiple-modulus framework which is capable of
providing de Sitter (dS) global minima precisely at the fixed points $\tau =
{\rm i}$ and $\omega$, by taking into consideration non-perturbative effects on
the superpotential and the dilaton K\"ahler potential. Due to the existence of
additional K\"ahler moduli, more possible vacua can occur, and the dS vacua
could be in general the deepest. We classify different choices of vacua, and
discuss their phenomenological implications for lepton masses and flavour
mixing.
| [
{
"created": "Mon, 16 Oct 2023 13:06:23 GMT",
"version": "v1"
}
] | 2023-10-17 | [
[
"King",
"Stephen F.",
""
],
[
"Wang",
"Xin",
""
]
] | In a class of modular-invariant models with multiple moduli fields, the viable lepton flavour mixing pattern can be realised if the values of moduli are selected to be at the fixed points. In this paper, we investigate a modulus stabilisation mechanism in the multiple-modulus framework which is capable of providing de Sitter (dS) global minima precisely at the fixed points $\tau = {\rm i}$ and $\omega$, by taking into consideration non-perturbative effects on the superpotential and the dilaton K\"ahler potential. Due to the existence of additional K\"ahler moduli, more possible vacua can occur, and the dS vacua could be in general the deepest. We classify different choices of vacua, and discuss their phenomenological implications for lepton masses and flavour mixing. |
2109.02217 | Guo-Liang Yu | Guo-Liang Yu, Zhi-Gang Wang, Xiu-Wu Wang | The $1D$, $2D$ $\Xi_{b}$ and $\Lambda_{b}$ baryons | null | Chin.Phys.C 46 (2022) 093102 | 10.1088/1674-1137/ac6dc6 | doi: 10.1088/1674-1137/ac6dc6 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Recently, scientists have made great progresses in experiments in searching
for the excited states of $\Xi_{b}$ and $\Lambda_{b}$ baryons such as the
$\Lambda_{b}(6072)$, $\Lambda_{b}(6146)$, $\Lambda_{b}(6152)$, $\Xi_{b}(6227)$,
$\Xi_{b}(6100)$, $\Xi_{b}(6327)$ and $\Xi_{b}(6333)$. Stimulated by these
progresses, we give a systematical analysis about the $1D$ and $2D$ states of
$\Xi_{b}$ and $\Lambda_{b}$ baryons with the method of QCD sum rules. By
constructing three types of interpolating currents, we calculate the masses and
pole residues of these heavy baryons with different excitation modes
$(L_{\rho},L_{\lambda})=(0,2)$, $(2,0)$ and $(1,1)$. As a result, we decode the
inner structures of $\Lambda_{b}(6146)$, $\Lambda_{b}(6152)$, $\Xi_{b}(6327)$
and $\Xi_{b}(6333)$, and favor assigning these states as the $1D$ baryons with
the quantum numbers $(L_{\rho},L_{\lambda})=(0,2)$ and $\frac{3}{2}^{+}$,
$\frac{5}{2}^{+}$, $\frac{3}{2}^{+}$ and $\frac{5}{2}^{+}$, respectively. In
addition, the predictions about the masses and pole residues of the other $1D$
and $2D$ states of $\Xi_{b}$ and $\Lambda_{b}$ baryons in this paper are
helpful in studying the D-wave bottom baryons in experiments in the future.
| [
{
"created": "Mon, 6 Sep 2021 03:05:13 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Sep 2021 08:09:34 GMT",
"version": "v2"
},
{
"created": "Sat, 18 Sep 2021 13:01:26 GMT",
"version": "v3"
}
] | 2023-04-14 | [
[
"Yu",
"Guo-Liang",
""
],
[
"Wang",
"Zhi-Gang",
""
],
[
"Wang",
"Xiu-Wu",
""
]
] | Recently, scientists have made great progresses in experiments in searching for the excited states of $\Xi_{b}$ and $\Lambda_{b}$ baryons such as the $\Lambda_{b}(6072)$, $\Lambda_{b}(6146)$, $\Lambda_{b}(6152)$, $\Xi_{b}(6227)$, $\Xi_{b}(6100)$, $\Xi_{b}(6327)$ and $\Xi_{b}(6333)$. Stimulated by these progresses, we give a systematical analysis about the $1D$ and $2D$ states of $\Xi_{b}$ and $\Lambda_{b}$ baryons with the method of QCD sum rules. By constructing three types of interpolating currents, we calculate the masses and pole residues of these heavy baryons with different excitation modes $(L_{\rho},L_{\lambda})=(0,2)$, $(2,0)$ and $(1,1)$. As a result, we decode the inner structures of $\Lambda_{b}(6146)$, $\Lambda_{b}(6152)$, $\Xi_{b}(6327)$ and $\Xi_{b}(6333)$, and favor assigning these states as the $1D$ baryons with the quantum numbers $(L_{\rho},L_{\lambda})=(0,2)$ and $\frac{3}{2}^{+}$, $\frac{5}{2}^{+}$, $\frac{3}{2}^{+}$ and $\frac{5}{2}^{+}$, respectively. In addition, the predictions about the masses and pole residues of the other $1D$ and $2D$ states of $\Xi_{b}$ and $\Lambda_{b}$ baryons in this paper are helpful in studying the D-wave bottom baryons in experiments in the future. |
1309.7628 | Jacek Syska Mr. | J. Dajka, J. Syska, and J. {\L}uczka | Geometric phase of neutrino propagating through dissipative matter | 4 pages, 3 figures | Phys.Rev.D 83, 097302 (2011) | 10.1103/PhysRevD.83.097302 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the geometric phase (GP) in neutrino oscillation for both Dirac and
Majorana neutrinos. We apply the kinematic generalization of the GP to quantum
open systems that take into account the coupling to a dissipative environment.
In the dissipationless case, the GP does not depend on the Majorana angle. It
is not the case in the presence of dissipation and hence the GP can serve as a
tool determining the type of the Dirac vs the Majorana neutrino.
| [
{
"created": "Sun, 29 Sep 2013 17:24:29 GMT",
"version": "v1"
}
] | 2013-10-01 | [
[
"Dajka",
"J.",
""
],
[
"Syska",
"J.",
""
],
[
"Łuczka",
"J.",
""
]
] | We study the geometric phase (GP) in neutrino oscillation for both Dirac and Majorana neutrinos. We apply the kinematic generalization of the GP to quantum open systems that take into account the coupling to a dissipative environment. In the dissipationless case, the GP does not depend on the Majorana angle. It is not the case in the presence of dissipation and hence the GP can serve as a tool determining the type of the Dirac vs the Majorana neutrino. |
hep-ph/0309145 | Antoni Szczurek | Antoni Szczurek | A hybrid model for $\gamma^* p$ scattering at small Bjorken-x | 5 pages, 2 figures, a talk at the XI international workshop on Deep
Inelastic Scattering, St. Petersburg, 23-27 April 2003 | null | null | null | hep-ph | null | We extend the dipole model for virtual photon - proton scattering to include
the resolved photon component explicitly. The parameters of the resolved photon
component are taken from the literature, while the parameters of the
dipole-nucleon interaction are fitted to the HERA data. A good agreement with
experimental data is obtained beyond the region of the fit.
| [
{
"created": "Fri, 12 Sep 2003 15:48:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Szczurek",
"Antoni",
""
]
] | We extend the dipole model for virtual photon - proton scattering to include the resolved photon component explicitly. The parameters of the resolved photon component are taken from the literature, while the parameters of the dipole-nucleon interaction are fitted to the HERA data. A good agreement with experimental data is obtained beyond the region of the fit. |
hep-ph/9902390 | Herbert Weigel | Herbert Weigel | Nucleon Structure Functions in a Chiral Soliton Model | 5 pages LaTeX, 3 figures, uses esppre.sty (enclosed) Talk presented
at the KEK-Tanashi Int. Symposium on the Physics of Hadrons and Nuclei,
Tokyo, Dec. 1998, to appear in the proceedings | Nucl.Phys. A670 (2000) 92 | 10.1016/S0375-9474(00)00077-4 | MIT-CTP-2825 | hep-ph | null | The computation of nucleon structure functions within the Nambu-Jona-Lasinio
chiral soliton model is outlined. After some technical remarks on the issue of
regularization numerical results for the both unpolarized and polarized
structure functions are presented. The generalization to flavor SU(3) is
sketched.
| [
{
"created": "Thu, 18 Feb 1999 15:02:16 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Weigel",
"Herbert",
""
]
] | The computation of nucleon structure functions within the Nambu-Jona-Lasinio chiral soliton model is outlined. After some technical remarks on the issue of regularization numerical results for the both unpolarized and polarized structure functions are presented. The generalization to flavor SU(3) is sketched. |
hep-ph/0011337 | Xiao-Gang He | X.-G. He (NTU), Y.-K. Hsiao (NTU), J.-Q. Shi (NTU), Y.-L. Wu (ITP) and
Y.-F. Zhou (ITP) | The CP violating phase $\gamma$ from global fit of rare charmless
hadronic B decays | Revised verion with the new experimental data from Belle and Babar
included in the analysis to obtain the global fit for the CP violating phase
gamma. RevTex, 32 pages and 8 figures | Phys.Rev.D64:034002,2001 | 10.1103/PhysRevD.64.034002 | null | hep-ph hep-ex | null | We study constraints on the CP violating phase $\gamma$ in the
Kobayashi-Maskawa model using available experimental data. We first follow the
conventional method to up date the constraint on $\gamma$ by performing a
$\chi^2$ analysis using data from $|\epsilon_K|$, $\Delta m_{B_{d,s}}$ and
$|V_{ub}/V_{cb}|$. We also include the recent information on $\sin2\beta$ in
the analysis. We obtain the best fit for $\gamma$ to be $66^\circ$ and the 95%
C.L. allowed range to be $42^\circ \sim 87^\circ$. We then develop a method to
carry out a $\chi^2$ analysis based on SU(3) symmetry using data from $B\to \pi
\pi$ and $B\to K \pi$. We also discuss SU(3) breaking effects from model
estimate. We find that present data on $B\to \pi\pi, K \pi$ can also give some
constraint on $\gamma$ although weaker than the earlier method limited by the
present experimental errors. Future improved data will provide more stringent
constraint. Finally we perform a combined fit using data from $|\epsilon_K|$,
$\Delta m_{B_{d,s}}$, $|V_{ub}/V_{cb}|$, $\sin2\beta$ and rare charmless
hadronic B decays. The combined analysis gives $\gamma=67^\circ$ for the best
fit value and $43^\circ \sim 87^\circ$ as the 95% C.L. allowed range. Several
comments on other methods to determine $\gamma$ based on SU(3) symmetry are
also provided.
| [
{
"created": "Tue, 28 Nov 2000 02:31:00 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Dec 2000 07:07:43 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Mar 2001 01:31:17 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"He",
"X. -G.",
"",
"NTU"
],
[
"Hsiao",
"Y. -K.",
"",
"NTU"
],
[
"Shi",
"J. -Q.",
"",
"NTU"
],
[
"Wu",
"Y. -L.",
"",
"ITP"
],
[
"Zhou",
"Y. -F.",
"",
"ITP"
]
] | We study constraints on the CP violating phase $\gamma$ in the Kobayashi-Maskawa model using available experimental data. We first follow the conventional method to up date the constraint on $\gamma$ by performing a $\chi^2$ analysis using data from $|\epsilon_K|$, $\Delta m_{B_{d,s}}$ and $|V_{ub}/V_{cb}|$. We also include the recent information on $\sin2\beta$ in the analysis. We obtain the best fit for $\gamma$ to be $66^\circ$ and the 95% C.L. allowed range to be $42^\circ \sim 87^\circ$. We then develop a method to carry out a $\chi^2$ analysis based on SU(3) symmetry using data from $B\to \pi \pi$ and $B\to K \pi$. We also discuss SU(3) breaking effects from model estimate. We find that present data on $B\to \pi\pi, K \pi$ can also give some constraint on $\gamma$ although weaker than the earlier method limited by the present experimental errors. Future improved data will provide more stringent constraint. Finally we perform a combined fit using data from $|\epsilon_K|$, $\Delta m_{B_{d,s}}$, $|V_{ub}/V_{cb}|$, $\sin2\beta$ and rare charmless hadronic B decays. The combined analysis gives $\gamma=67^\circ$ for the best fit value and $43^\circ \sim 87^\circ$ as the 95% C.L. allowed range. Several comments on other methods to determine $\gamma$ based on SU(3) symmetry are also provided. |
hep-ph/9911513 | Hamid Beshtoev | Kh.M. Beshtoev | Types of Particle Oscillations and Their Realizations in Neutral K Meson
and Neutrino Oscillations | LATEX, 10 pages, no figures and tables | Hadronic J. 23 (2000) 477-485 | null | null | hep-ph | null | Two particle vacuum transitions (oscillations) are studied in the general
case. We found that: 1) a nondiagonal mass term characterising oscillations is
the width of two particle transitions into each other (this width can be
computed by the standard method); 2) two types of oscillations take place: real
and virtual. Solution of the problem of origin of mixing angle in the theory of
vacuum oscillations is given. It is shown that neutral K meson and neutrino
oscillations must proceed via two stages. First, neutral K^{o}, antineutral
K-eigenstates of strong interaction (or nu(e), nu(mu), nu(tau) eigenstates of
weak interactions) are created. Then, owing to the presence of the strangeness
violating weak interaction (or the lepton number violating interactions), these
meson states (or neutrino states) are converted into superpositions of neutral
K(1) and neutral K(2)-eigenstates of the weak interaction violating strangeness
(or nu(1), nu(2), nu(3)-eigenstates of the interaction-violating lepton
numbers). Further, neutral K-meson or neutrino oscillations will occur in
accordance with the standard scheme.
| [
{
"created": "Mon, 29 Nov 1999 10:02:35 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Beshtoev",
"Kh. M.",
""
]
] | Two particle vacuum transitions (oscillations) are studied in the general case. We found that: 1) a nondiagonal mass term characterising oscillations is the width of two particle transitions into each other (this width can be computed by the standard method); 2) two types of oscillations take place: real and virtual. Solution of the problem of origin of mixing angle in the theory of vacuum oscillations is given. It is shown that neutral K meson and neutrino oscillations must proceed via two stages. First, neutral K^{o}, antineutral K-eigenstates of strong interaction (or nu(e), nu(mu), nu(tau) eigenstates of weak interactions) are created. Then, owing to the presence of the strangeness violating weak interaction (or the lepton number violating interactions), these meson states (or neutrino states) are converted into superpositions of neutral K(1) and neutral K(2)-eigenstates of the weak interaction violating strangeness (or nu(1), nu(2), nu(3)-eigenstates of the interaction-violating lepton numbers). Further, neutral K-meson or neutrino oscillations will occur in accordance with the standard scheme. |
2404.00854 | Saleh Allehabi | Saleh O. Allehabi, V. A. Dzuba, and V. V. Flambaum | High-accuracy optical clocks with sensitivity to the fine-structure
constant variation based on Sm$ ^{10+} $ | 6 pages, 1 figure. arXiv admin note: text overlap with
arXiv:2303.17456 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We identify two metastable excited states in Sm$ ^{10+} $ highly charged ion
as candidates for high accuracy optical clocks. Several atomic properties
relevant to optical clock development are calculated using relativistic
many-body methods. This includes energy levels, transition amplitudes,
lifetimes, scalar polarizabilities, black body radiation shift, and the
sensitivity to the fine structure constant variation. We found that the clock
transitions are not sensitive to perturbation, e.g., relative black body
radiation shifts are $\sim 10^{-19}$. The enhancement factor for the $\alpha$
variation is $\sim$ 0.8 for one clock transition and $\sim$ 16 for another.
| [
{
"created": "Mon, 1 Apr 2024 01:49:03 GMT",
"version": "v1"
}
] | 2024-04-02 | [
[
"Allehabi",
"Saleh O.",
""
],
[
"Dzuba",
"V. A.",
""
],
[
"Flambaum",
"V. V.",
""
]
] | We identify two metastable excited states in Sm$ ^{10+} $ highly charged ion as candidates for high accuracy optical clocks. Several atomic properties relevant to optical clock development are calculated using relativistic many-body methods. This includes energy levels, transition amplitudes, lifetimes, scalar polarizabilities, black body radiation shift, and the sensitivity to the fine structure constant variation. We found that the clock transitions are not sensitive to perturbation, e.g., relative black body radiation shifts are $\sim 10^{-19}$. The enhancement factor for the $\alpha$ variation is $\sim$ 0.8 for one clock transition and $\sim$ 16 for another. |
hep-ph/0210194 | Alexander Kurilin | Alexander V. Kurilin (MGOPU) | Particle Physics in Intense Electromagnetic Fields | LaTex file, 22 pages, 1 Postscript figure | Nuovo Cim.A112:977-1000,1999 | 10.1007/BF03035905 | null | hep-ph | null | The quantum field theory in the presence of classical background
electromagnetic fields is reviewed. We give a pedagogical introduction to the
Feynman-Furry method of describing non-perturbative interactions with very
strong electromagnetic fields. A particular emphasis is given to the case of
the plane-wave electromagnetic field for which the charged particles' wave
functions and propagators are presented. Some general features of quantum
processes proceeding in the intense electromagnetic background are argued. We
also discuss the possibilities of searching new physics through the
investigations of quantum phenomena induced by the strong electromagnetic
environment.
| [
{
"created": "Sun, 13 Oct 2002 10:06:43 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Kurilin",
"Alexander V.",
"",
"MGOPU"
]
] | The quantum field theory in the presence of classical background electromagnetic fields is reviewed. We give a pedagogical introduction to the Feynman-Furry method of describing non-perturbative interactions with very strong electromagnetic fields. A particular emphasis is given to the case of the plane-wave electromagnetic field for which the charged particles' wave functions and propagators are presented. Some general features of quantum processes proceeding in the intense electromagnetic background are argued. We also discuss the possibilities of searching new physics through the investigations of quantum phenomena induced by the strong electromagnetic environment. |
2101.01980 | Soma Sanyal Dr | Pratik K. Das, Sovan Sau, Abhisek Saha and Soma Sanyal | Decay of baryon inhomogeneities in an expanding universe | 20 pages and 7 figures | null | 10.1140/epjc/s10052-021-09561-3 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Baryon inhomogeneities can be generated very early in the universe. These
inhomogeneities then decay by particle diffusion in an expanding universe. We
study the decay of these baryon inhomogeneities in the early universe using the
diffusion equation in the Friedmann-Lemaitre-Robertson-Walker (FLRW) metric. We
have studied the decay starting from the electroweak phase transition. We
calculate the interaction cross section of the quarks with the neutrinos, the
electrons and the muons and obtain the diffusion coefficients. The diffusion
coefficients are temperature dependent. We find that the expansion of the
universe causes the inhomogeneities to decay at a faster rate. We find that the
baryon inhomogeneities generated at the electroweak epoch have very low
amplitudes at the time of the quark hadron phase transition. So unless
inhomogeneities are generated with a very high amplitude (greater than $10^5$
times the background density), they will have no effect on the quark hadron
phase transition. After the quark hadron phase transition, we include the
interaction of the muons with the neutrons and the protons till 100 MeV. We
also find that large density inhomogeneities generated during the quark hadron
transition with sizes of the order of 1 km must have amplitudes greater than
$10^5 $ times the background density to survive upto the nucleosynthesis epoch
in an expanding universe.
| [
{
"created": "Wed, 6 Jan 2021 11:34:27 GMT",
"version": "v1"
}
] | 2021-09-29 | [
[
"Das",
"Pratik K.",
""
],
[
"Sau",
"Sovan",
""
],
[
"Saha",
"Abhisek",
""
],
[
"Sanyal",
"Soma",
""
]
] | Baryon inhomogeneities can be generated very early in the universe. These inhomogeneities then decay by particle diffusion in an expanding universe. We study the decay of these baryon inhomogeneities in the early universe using the diffusion equation in the Friedmann-Lemaitre-Robertson-Walker (FLRW) metric. We have studied the decay starting from the electroweak phase transition. We calculate the interaction cross section of the quarks with the neutrinos, the electrons and the muons and obtain the diffusion coefficients. The diffusion coefficients are temperature dependent. We find that the expansion of the universe causes the inhomogeneities to decay at a faster rate. We find that the baryon inhomogeneities generated at the electroweak epoch have very low amplitudes at the time of the quark hadron phase transition. So unless inhomogeneities are generated with a very high amplitude (greater than $10^5$ times the background density), they will have no effect on the quark hadron phase transition. After the quark hadron phase transition, we include the interaction of the muons with the neutrons and the protons till 100 MeV. We also find that large density inhomogeneities generated during the quark hadron transition with sizes of the order of 1 km must have amplitudes greater than $10^5 $ times the background density to survive upto the nucleosynthesis epoch in an expanding universe. |
hep-ph/9410289 | Thomas Mannel | Ahmed Ali, Gian Giudice, Thomas Mannel | Towards a Model Independent Analysis of Rare $B$ Decays | Contribution to ICHEP94, Glasgow, 20. - 27. July 1994, 5 pages,
LaTeX, uses ichep.sty and epsf.sty, 4 uuencoded and compressed figures,
CERN-TH.7430/94 | null | 10.1007/BF01624585 | null | hep-ph | null | We propose to undertake a model-independent analysis of the inclusive decay
rates and distributions in the processes \bgamaxs~ and \Bsell ~($B=B^\pm$ or
$B^0_d$). We show how measurements of the decay rates and distributions in
these processes would allow us to extract the magnitude and sign of the
dominant Wilson coefficients of the magnetic moment operator $\mb \bar{s}_L
\sigma_{\mu \nu} b_R F^{\mu \nu }$ and the four-fermion operators $(\bar{s}_L
\gamma_\mu b_L)(\bar{\ell} \gamma^{\mu} \ell)$ and $(\bar{s}_L \gamma_\mu
b_L)(\bar{\ell} \gamma^{\mu}\gamma^5 \ell)$.
| [
{
"created": "Fri, 14 Oct 1994 15:49:32 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Ali",
"Ahmed",
""
],
[
"Giudice",
"Gian",
""
],
[
"Mannel",
"Thomas",
""
]
] | We propose to undertake a model-independent analysis of the inclusive decay rates and distributions in the processes \bgamaxs~ and \Bsell ~($B=B^\pm$ or $B^0_d$). We show how measurements of the decay rates and distributions in these processes would allow us to extract the magnitude and sign of the dominant Wilson coefficients of the magnetic moment operator $\mb \bar{s}_L \sigma_{\mu \nu} b_R F^{\mu \nu }$ and the four-fermion operators $(\bar{s}_L \gamma_\mu b_L)(\bar{\ell} \gamma^{\mu} \ell)$ and $(\bar{s}_L \gamma_\mu b_L)(\bar{\ell} \gamma^{\mu}\gamma^5 \ell)$. |
hep-ph/9907401 | Thomas G. Rizzo | Thomas G. Rizzo | Tests of Low Scale Quantum Gravity in $e^-e^-$ and $\gamma \gamma$
Collisions | 7 pages, 4 figs, LaTex, Talk given at the World-Wide Study of Physics
and Detectors for Future Linear Colliders(LCWS99), Sitges, Barcelona, Spain,
28 April-5 May 1999 | null | null | SLAC-PUB-8204 | hep-ph | null | Arkani-Hamed, Dimopoulos and Dvali have recently proposed that gravity may
become strong at energies near 1 TeV due to the existence of large extra
dimensions thus `removing' the hierarchy problem. In this talk we examine the
exchange of towers of Kaluza-Klein gravitons and their influence on Moller
scattering as well as the production of pairs of massive gauge bosons in
$\gamma \gamma$ collisions. These tower exchanges lead to a set of new
dimension-8 operators that can significant alter the Standard Model
expectations for these processes. In the case of $\gamma \gamma$ collisions,
the role of polarization for both the initial state photons and the final state
gauge bosons in improving sensitivity to graviton exchange is emphasized.
| [
{
"created": "Sat, 17 Jul 1999 01:51:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rizzo",
"Thomas G.",
""
]
] | Arkani-Hamed, Dimopoulos and Dvali have recently proposed that gravity may become strong at energies near 1 TeV due to the existence of large extra dimensions thus `removing' the hierarchy problem. In this talk we examine the exchange of towers of Kaluza-Klein gravitons and their influence on Moller scattering as well as the production of pairs of massive gauge bosons in $\gamma \gamma$ collisions. These tower exchanges lead to a set of new dimension-8 operators that can significant alter the Standard Model expectations for these processes. In the case of $\gamma \gamma$ collisions, the role of polarization for both the initial state photons and the final state gauge bosons in improving sensitivity to graviton exchange is emphasized. |
1606.07391 | Evgeny Akhmedov | Evgeny Akhmedov | Atmospheric neutrinos, $nu_e-nu_s$ oscillations, and a novel neutrino
evolution equation | 10 pages, 2 figures. v2: typos corrected. v3: some equations in
section 2 reordered, section 3 expanded, figures enhanced and figure captions
improved following referee's suggestions. Matches JHEP version | JHEP 08 (2016)153 | 10.1007/JHEP08(2016)153 | null | hep-ph hep-ex nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If a sterile neutrino nu_s with an eV-scale mass and a sizeable mixing to the
electron neutrino exists, as indicated by the reactor and gallium neutrino
anomalies, a strong resonance enhancement of nu_e-nu_s oscillations of
atmospheric neutrinos should occur in the TeV energy range. At these energies
neutrino flavour transitions in the 3+1 scheme depend on just one neutrino mass
squared difference and are fully described within a 3-flavour oscillation
framework. We demonstrate that the flavour transitions of atmospheric nu_e can
actually be very accurately described in a 2-flavour framework, with neutrino
flavour evolution governed by an inhomogeneous Schroedinger-like equation.
Evolution equations of this type have not been previously considered in the
theory of neutrino oscillations.
| [
{
"created": "Thu, 23 Jun 2016 18:13:42 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jun 2016 13:08:50 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Sep 2016 13:36:08 GMT",
"version": "v3"
}
] | 2016-09-29 | [
[
"Akhmedov",
"Evgeny",
""
]
] | If a sterile neutrino nu_s with an eV-scale mass and a sizeable mixing to the electron neutrino exists, as indicated by the reactor and gallium neutrino anomalies, a strong resonance enhancement of nu_e-nu_s oscillations of atmospheric neutrinos should occur in the TeV energy range. At these energies neutrino flavour transitions in the 3+1 scheme depend on just one neutrino mass squared difference and are fully described within a 3-flavour oscillation framework. We demonstrate that the flavour transitions of atmospheric nu_e can actually be very accurately described in a 2-flavour framework, with neutrino flavour evolution governed by an inhomogeneous Schroedinger-like equation. Evolution equations of this type have not been previously considered in the theory of neutrino oscillations. |
0905.4355 | Anton Krylov | M. A. Braun, A. V. Krylov | Unitarity of the tree approximation to the Glauber AA amplitude for
large A | 15 pages, 1 figure, 1 table. Submitted to Yad. Fiz | Phys.Atom.Nucl.74:199-208,2011 | 10.1134/S1063778811020086 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The nucleus-nucleus Glauber amplitude in the tree approximation is studied
for heavy participant nuclei. It is shown that, contrary to previous published
results, it is not unitary for realistic values of nucleon-nucleon
cross-sections.
| [
{
"created": "Wed, 27 May 2009 08:17:46 GMT",
"version": "v1"
}
] | 2011-03-14 | [
[
"Braun",
"M. A.",
""
],
[
"Krylov",
"A. V.",
""
]
] | The nucleus-nucleus Glauber amplitude in the tree approximation is studied for heavy participant nuclei. It is shown that, contrary to previous published results, it is not unitary for realistic values of nucleon-nucleon cross-sections. |
hep-ph/0004009 | Sourendu Gupta | S.Banerjee, R.Basu, M.Dittmar, R.V.Gavai, F.Gelis, D.Ghosh, Sourendu
Gupta, D.Indumathi and Asmita Mukherjee | QCD Working Group Report | Report of the QCD group at WHEPP-6, Chennai, January 2000. 7 pages | Pramana 55:327-333,2000 | 10.1007/s12043-000-0112-3 | null | hep-ph | null | This is the report of the QCD working group at WHEPP 6. Discussions and work
on heavy ion collisions, polarised scattering, and collider phenomenology are
reported.
| [
{
"created": "Mon, 3 Apr 2000 07:18:30 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Banerjee",
"S.",
""
],
[
"Basu",
"R.",
""
],
[
"Dittmar",
"M.",
""
],
[
"Gavai",
"R. V.",
""
],
[
"Gelis",
"F.",
""
],
[
"Ghosh",
"D.",
""
],
[
"Gupta",
"Sourendu",
""
],
[
"Indumathi",
"D.",
""
],
[
"Mukherjee",
"Asmita",
""
]
] | This is the report of the QCD working group at WHEPP 6. Discussions and work on heavy ion collisions, polarised scattering, and collider phenomenology are reported. |
hep-ph/9905492 | Carl E. Carlson | Carl E. Carlson | High Transverse Momentum Meson Production: A Different Way To Probe
Hadron Structure | Talk at the Electron Polarized Ion Collider Workshop (EPIC99), at
IUCF, Bloomington, IA, April 1999, 13 pp, 7 fig, uses epsf.sty and sprocl.sty | null | null | WM-99-111 | hep-ph | null | Hard, or high transverse momentum, pion photoproduction can be a tool for
probing the parton structure of the beam and target. We discuss the
perturbative and soft processes that contribute, and show how regions where
perturbative processes dominate can give us the parton structure information.
Polarized initial states are needed to get information on polarization
distributions. Current polarization asymmetry data is mostly in the soft
region. However, with the proposed EPIC machine parameters, determining the
polarized gluon distribution using hard pion photoproduction appears quite
feasible.
| [
{
"created": "Wed, 26 May 1999 14:49:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Carlson",
"Carl E.",
""
]
] | Hard, or high transverse momentum, pion photoproduction can be a tool for probing the parton structure of the beam and target. We discuss the perturbative and soft processes that contribute, and show how regions where perturbative processes dominate can give us the parton structure information. Polarized initial states are needed to get information on polarization distributions. Current polarization asymmetry data is mostly in the soft region. However, with the proposed EPIC machine parameters, determining the polarized gluon distribution using hard pion photoproduction appears quite feasible. |
2209.04979 | Xiao-Yun Wang | Chen Dong, Jiyuan Zhang, Jingxuan Bu, Huifang Zhou, and Xiao-Yun Wang | Exploration of trace anomaly contribution to proton mass based on light
vector meson photoproduction | 7 pages, 4 figures | null | 10.1140/epjc/s10052-023-11260-0 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | In the quantum chromodynamics, the mass source of the proton is decomposed
into four parts by the energy momentum tensor : quark energy term, gluon energy
term, quark mass term and trace anomaly term. And the trace anomaly term is the
most crucial contribution for studying the internal structure of the proton. In
this work, under the definition of the vector meson dominant model, the trace
anomaly contribution of the proton is extracted from the experimental datas of
light vector mesons $\rho$, $\omega$ and $\phi$ photoproduction at the
near-threshold, which are ($1.15\pm0.08$)$\%$, ($2.70\pm0.04$)$\%$ and
($5.58\pm0.25$)$\%$, respectively. Eventually, the average trace anomaly
contribution of the proton is ($4.36\pm0.40$) $\%$, which only account for a
small fraction of the total proton mass. The result of this work will provide
theoretical information support for further study of proton internal structure.
| [
{
"created": "Mon, 12 Sep 2022 01:35:36 GMT",
"version": "v1"
}
] | 2023-02-22 | [
[
"Dong",
"Chen",
""
],
[
"Zhang",
"Jiyuan",
""
],
[
"Bu",
"Jingxuan",
""
],
[
"Zhou",
"Huifang",
""
],
[
"Wang",
"Xiao-Yun",
""
]
] | In the quantum chromodynamics, the mass source of the proton is decomposed into four parts by the energy momentum tensor : quark energy term, gluon energy term, quark mass term and trace anomaly term. And the trace anomaly term is the most crucial contribution for studying the internal structure of the proton. In this work, under the definition of the vector meson dominant model, the trace anomaly contribution of the proton is extracted from the experimental datas of light vector mesons $\rho$, $\omega$ and $\phi$ photoproduction at the near-threshold, which are ($1.15\pm0.08$)$\%$, ($2.70\pm0.04$)$\%$ and ($5.58\pm0.25$)$\%$, respectively. Eventually, the average trace anomaly contribution of the proton is ($4.36\pm0.40$) $\%$, which only account for a small fraction of the total proton mass. The result of this work will provide theoretical information support for further study of proton internal structure. |
1310.4124 | Oscar Castillo Felisola Dr. | Oscar Castillo-Felisola and Cristobal Corral and Cristian
Villavicencio and Alfonso R. Zerwekh | Fermion Masses Through Condensation in Spacetimes with Torsion | 8 pages, including 3 appendices and bibliography. No figures. RevTex
format. Published in Phys. Rev. D | Phys. Rev. D 88, 124022 (2013) | 10.1103/PhysRevD.88.124022 | null | hep-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we argue the possibility that fermion masses, in particular
quarks, originate through the condensation of a fourth family that interacts
with all of the quarks via a contact four-fermion term coming from the
existence of torsion on the spacetime. Extra dimensions are considered to avoid
the hierarchy problem.
| [
{
"created": "Tue, 15 Oct 2013 17:32:27 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Dec 2013 18:20:11 GMT",
"version": "v2"
}
] | 2013-12-11 | [
[
"Castillo-Felisola",
"Oscar",
""
],
[
"Corral",
"Cristobal",
""
],
[
"Villavicencio",
"Cristian",
""
],
[
"Zerwekh",
"Alfonso R.",
""
]
] | In this paper we argue the possibility that fermion masses, in particular quarks, originate through the condensation of a fourth family that interacts with all of the quarks via a contact four-fermion term coming from the existence of torsion on the spacetime. Extra dimensions are considered to avoid the hierarchy problem. |
1909.11906 | Natsumi Ikeno | Natsumi Ikeno, Jorgivan M. Dias, Wei-Hong Liang, Eulogio Oset | $\chi_{c1}$ decays into a pseudoscalar meson and a vector-vector
molecule | 12 pages, 2 figures, 1 table | Phys. Rev. D 100, 114011 (2019) | 10.1103/PhysRevD.100.114011 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We evaluate ratios of the $\chi_{c1}$ decay rates to $\eta$ ($\eta', K^-$)
and one of the $f_0(1370)$, $f_0(1710)$, $f_2(1270)$, $f_2'(1525)$,
$K^{*}_2(1430)$ resonances, which in the local hidden gauge approach are
dynamically generated from the vector-vector interaction. With the simple
assumption that the $\chi_{c1}$ is a singlet of SU(3), and the input from the
study of these resonances as vector-vector molecular states, we describe the
experimental ratio $\mathcal{B}(\chi_{c1} \rightarrow \eta f_2(1270))/
\mathcal{B}(\chi_{c1} \rightarrow \eta' f_2'(1525))$ and make predictions for
six more ratios that can be tested in future experiments.
| [
{
"created": "Thu, 26 Sep 2019 05:47:46 GMT",
"version": "v1"
}
] | 2019-12-11 | [
[
"Ikeno",
"Natsumi",
""
],
[
"Dias",
"Jorgivan M.",
""
],
[
"Liang",
"Wei-Hong",
""
],
[
"Oset",
"Eulogio",
""
]
] | We evaluate ratios of the $\chi_{c1}$ decay rates to $\eta$ ($\eta', K^-$) and one of the $f_0(1370)$, $f_0(1710)$, $f_2(1270)$, $f_2'(1525)$, $K^{*}_2(1430)$ resonances, which in the local hidden gauge approach are dynamically generated from the vector-vector interaction. With the simple assumption that the $\chi_{c1}$ is a singlet of SU(3), and the input from the study of these resonances as vector-vector molecular states, we describe the experimental ratio $\mathcal{B}(\chi_{c1} \rightarrow \eta f_2(1270))/ \mathcal{B}(\chi_{c1} \rightarrow \eta' f_2'(1525))$ and make predictions for six more ratios that can be tested in future experiments. |
hep-ph/0106059 | Christian Weiss | A.V. Radyushkin and C. Weiss | Kinematical twist-3 effects in DVCS as a quark spin rotation | 4 pages, revtex, 3 eps figures included using epsf | Phys.Rev. D64 (2001) 097504 | 10.1103/PhysRevD.64.097504 | JLAB-THY-01-16 | hep-ph | null | We point out that the kinematical twist-3 contributions to the DVCS
amplitude, required to restore electromagnetic gauge invariance of the twist-2
amplitude up to O(t/q^2), can be understood as a spin rotation applied to the
twist-2 quark density matrix in the target. This allows for a compact
representation of the twist-3 effects, as well as for a simple physical
interpretation.
| [
{
"created": "Tue, 5 Jun 2001 21:47:06 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Radyushkin",
"A. V.",
""
],
[
"Weiss",
"C.",
""
]
] | We point out that the kinematical twist-3 contributions to the DVCS amplitude, required to restore electromagnetic gauge invariance of the twist-2 amplitude up to O(t/q^2), can be understood as a spin rotation applied to the twist-2 quark density matrix in the target. This allows for a compact representation of the twist-3 effects, as well as for a simple physical interpretation. |
0705.1290 | Louis J. Clavelli | L. Clavelli | Landscape Implications of Extended Higgs Models | 15 pages, 2 figures, extended analysis, some significant changes
version 3 to appear in Int. J. Mod. Phys. A | Int.J.Mod.Phys.A23:3509-3523,2008 | 10.1142/S0217751X08041736 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | From several points of view it is strongly suggested that the current
universe is unstable and will ultimately decay to one that is exactly
supersymmetric (susy). The possibility that atoms and molecules form in this
future universe requires that the degenerate electron/selectron mass is
non-zero and hence that electroweak symmetry breaking (EWSB) survives the phase
transition to exact susy. However, the minimal supersymmetric standard model
(MSSM) and several of its extensions have no EWSB in the susy limit. Among the
extended higgs models that have been discussed one stands out in this regard.
The higgs sector that is revealed at the Large Hadron Collider (LHC) will
therefore have implications for the future universe. We also address the
question as to whether the transition to the exact susy phase with EWSB is
exothermic.
| [
{
"created": "Wed, 9 May 2007 13:41:22 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Oct 2007 15:18:24 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Sep 2008 21:20:33 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Clavelli",
"L.",
""
]
] | From several points of view it is strongly suggested that the current universe is unstable and will ultimately decay to one that is exactly supersymmetric (susy). The possibility that atoms and molecules form in this future universe requires that the degenerate electron/selectron mass is non-zero and hence that electroweak symmetry breaking (EWSB) survives the phase transition to exact susy. However, the minimal supersymmetric standard model (MSSM) and several of its extensions have no EWSB in the susy limit. Among the extended higgs models that have been discussed one stands out in this regard. The higgs sector that is revealed at the Large Hadron Collider (LHC) will therefore have implications for the future universe. We also address the question as to whether the transition to the exact susy phase with EWSB is exothermic. |
1508.03705 | Alexander Nesterenko | A.V.Nesterenko | Inclusive tau lepton hadronic decay in vector and axial-vector channels
within dispersive approach to QCD | Talk given at 11th International Conference on Quark Confinement and
the Hadron Spectrum, 8 - 12 September 2014, Saint-Petersburg, Russian
Federation; 6 pages, 3 figures, 1 table | AIP Conf. Proc. 1701, 040016 (2016) | 10.1063/1.4938633 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dispersive approach to QCD, which properly embodies the intrinsically
nonperturbative constraints originating in the kinematic restrictions on
relevant physical processes and extends the applicability range of perturbation
theory towards the infrared domain, is briefly overviewed. The study of OPAL
(update 2012) and ALEPH (update 2014) experimental data on inclusive tau lepton
hadronic decay in vector and axial-vector channels within dispersive approach
is presented.
| [
{
"created": "Sat, 15 Aug 2015 08:05:33 GMT",
"version": "v1"
}
] | 2016-01-27 | [
[
"Nesterenko",
"A. V.",
""
]
] | The dispersive approach to QCD, which properly embodies the intrinsically nonperturbative constraints originating in the kinematic restrictions on relevant physical processes and extends the applicability range of perturbation theory towards the infrared domain, is briefly overviewed. The study of OPAL (update 2012) and ALEPH (update 2014) experimental data on inclusive tau lepton hadronic decay in vector and axial-vector channels within dispersive approach is presented. |
1205.5536 | Abdesslam Arhrib | Abdesslam Arhrib, Rachid Benbrik and Chuan-Hung Chen | H\to\gamma\gamma in the Complex Two Higgs Doublet Model | 9 pages, 6 eps figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the parameter regions in the complex Two Higgs Doublet Model
(c2HDM) with explicit CP violation that can describe current LHC hints for one
or more Higgs boson signals at 125 GeV. Such a simple extension of the Standard
model has three neutral Higgs bosons and a pair charged Higgs and leads to rich
CP-violating sources including the CP-even CP-odd mixing of the neutral Higgs
bosons. Within this model we present the production of light Higgs boson at the
LHC followed by its decay into two photons. Our numerical study takes into
account theoretical and experimental constraints on the Higgs potential like
positivity, unitarity and perturbativity as well as $\rho$-parameter, $b\to
s\gamma$ and $R_b$. These requirement together with the minimum conditions
could explain the di-photon excess observed at the LHC. We also discuss the
effects of the CP violating phases on the CP violation observable which is the
difference between left-circular and right-circular polarization.
| [
{
"created": "Thu, 24 May 2012 19:24:52 GMT",
"version": "v1"
}
] | 2012-05-25 | [
[
"Arhrib",
"Abdesslam",
""
],
[
"Benbrik",
"Rachid",
""
],
[
"Chen",
"Chuan-Hung",
""
]
] | We explore the parameter regions in the complex Two Higgs Doublet Model (c2HDM) with explicit CP violation that can describe current LHC hints for one or more Higgs boson signals at 125 GeV. Such a simple extension of the Standard model has three neutral Higgs bosons and a pair charged Higgs and leads to rich CP-violating sources including the CP-even CP-odd mixing of the neutral Higgs bosons. Within this model we present the production of light Higgs boson at the LHC followed by its decay into two photons. Our numerical study takes into account theoretical and experimental constraints on the Higgs potential like positivity, unitarity and perturbativity as well as $\rho$-parameter, $b\to s\gamma$ and $R_b$. These requirement together with the minimum conditions could explain the di-photon excess observed at the LHC. We also discuss the effects of the CP violating phases on the CP violation observable which is the difference between left-circular and right-circular polarization. |
1505.03603 | Yunqi Liu | Yunqi Liu, Yungui Gong, and Bin Wang | Non-equilibrium condensation process in holographic superconductor with
nonlinear electrodynamics | 22 pages,accepted for publication in JHEP | null | 10.1007/JHEP02(2016)116 | null | hep-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the non-equilibrium condensation process in a holographic
superconductor with nonlinear corrections to the U(1) gauge field. We start
with an asymptotic Anti-de-Sitter(AdS) black hole against a complex scalar
perturbation at the initial time, and solve the dynamics of the gravitational
systems in the bulk. When the black hole temperature T is smaller than a
critical value Tc, the scalar perturbation grows exponentially till saturation,
the final state of spacetime approaches to a hairy black hole. In the bulk
theory, we find the clue of the influence of nonlinear corrections in the gauge
field on the process of the scalar field condensation. We show that the bulk
dynamics in the non-equilibrium process is completely consistent with the
observations on the boundary order parameter. Furthermore we examine the time
evolution of horizons in the bulk non-equilibrium transformation process from
the bald AdS black hole to the AdS hairy hole. Both the evolution of apparent
and event horizons show that the original AdS black hole configuration requires
more time to finish the transformation to become a hairy black hole if there is
nonlinear correction to the electromagnetic field. We generalize our
non-equilibrium discussions to the holographic entanglement entropy and find
that the holographic entanglement entropy can give us further understanding of
the influence of the nonlinearity in the gauge field on the scalar
condensation. In our analysis, we also compare the effect of different models
on the corrections to the gauge field on the formation of holographic
superconductor.
| [
{
"created": "Thu, 14 May 2015 03:06:57 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Feb 2016 13:24:55 GMT",
"version": "v2"
}
] | 2016-03-23 | [
[
"Liu",
"Yunqi",
""
],
[
"Gong",
"Yungui",
""
],
[
"Wang",
"Bin",
""
]
] | We study the non-equilibrium condensation process in a holographic superconductor with nonlinear corrections to the U(1) gauge field. We start with an asymptotic Anti-de-Sitter(AdS) black hole against a complex scalar perturbation at the initial time, and solve the dynamics of the gravitational systems in the bulk. When the black hole temperature T is smaller than a critical value Tc, the scalar perturbation grows exponentially till saturation, the final state of spacetime approaches to a hairy black hole. In the bulk theory, we find the clue of the influence of nonlinear corrections in the gauge field on the process of the scalar field condensation. We show that the bulk dynamics in the non-equilibrium process is completely consistent with the observations on the boundary order parameter. Furthermore we examine the time evolution of horizons in the bulk non-equilibrium transformation process from the bald AdS black hole to the AdS hairy hole. Both the evolution of apparent and event horizons show that the original AdS black hole configuration requires more time to finish the transformation to become a hairy black hole if there is nonlinear correction to the electromagnetic field. We generalize our non-equilibrium discussions to the holographic entanglement entropy and find that the holographic entanglement entropy can give us further understanding of the influence of the nonlinearity in the gauge field on the scalar condensation. In our analysis, we also compare the effect of different models on the corrections to the gauge field on the formation of holographic superconductor. |
1404.2389 | Chunsheng An | C. S. An and B. Saghai | Pion- and strangeness-baryon $\sigma$ terms in the extended chiral
constituent quark model | Version to appear in Phys. Rev. D | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within an extended chiral constituent quark formalism, we investigate
contributions from all possible five-quark components in the octet baryons to
the pion-baryon ($\sigma_{\pi B}$) and strangeness-baryon ($\sigma_{s B}$)
sigma terms; $B \equiv N,~\Lambda,~\Sigma,~\Xi$. The probabilities of the
quark-antiquark components in the ground-state baryon octet wave functions are
calculated by taking the baryons to be admixtures of three- and five-quark
components, with the relevant transitions handled {\it via} the $^{3}$P$_{0}$
mechanism. Predictions for $\sigma_{\pi B}$ and $\sigma_{s B}$ obtained by
using input parameters taken from the literature are reported. Our results turn
out to be, in general, consistent with the findings via lattice QCD and chiral
perturbation theory.
| [
{
"created": "Wed, 9 Apr 2014 08:01:02 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Apr 2015 00:42:44 GMT",
"version": "v2"
},
{
"created": "Wed, 1 Jul 2015 03:21:20 GMT",
"version": "v3"
}
] | 2015-07-02 | [
[
"An",
"C. S.",
""
],
[
"Saghai",
"B.",
""
]
] | Within an extended chiral constituent quark formalism, we investigate contributions from all possible five-quark components in the octet baryons to the pion-baryon ($\sigma_{\pi B}$) and strangeness-baryon ($\sigma_{s B}$) sigma terms; $B \equiv N,~\Lambda,~\Sigma,~\Xi$. The probabilities of the quark-antiquark components in the ground-state baryon octet wave functions are calculated by taking the baryons to be admixtures of three- and five-quark components, with the relevant transitions handled {\it via} the $^{3}$P$_{0}$ mechanism. Predictions for $\sigma_{\pi B}$ and $\sigma_{s B}$ obtained by using input parameters taken from the literature are reported. Our results turn out to be, in general, consistent with the findings via lattice QCD and chiral perturbation theory. |
hep-ph/0206034 | Donini Andrea | A. Donini, D. Meloni and P. Migliozzi | The silver channel at the Neutrino Factory | Latex2e, 36 pages, using epsfig | Nucl.Phys.B646:321-349,2002 | 10.1016/S0550-3213(02)00894-5 | null | hep-ph | null | We notice that looking for $\nu_e \to \nu_\tau$ at the same time as $\nu_e
\to \nu_\mu$ oscillations could significantly help to reduce the errors in the
leptonic CP-violating phase $\delta$ measurement. We show how the $\nu_e \to
\nu_\mu$ (``golden'') and $\nu_e \to \nu_\tau$ (``silver'') transitions
observed at an OPERA-like 2 Kton lead-emulsion detector at L = 732 Km, in
combination with the $\nu_e \to \nu_\mu$ transitions observed at a 40 Kton
magnetized iron detector with a baseline of L = 3000 Km, strongly reduce the
so-called $(\theta_{13}, \delta)$ ambiguity. We also show how a moderate
increase in the OPERA-like detector mass (4 Kton instead of 2 Kton) completely
eliminates the clone regions even for small values of $\theta_{13}$.
| [
{
"created": "Tue, 4 Jun 2002 16:57:09 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Donini",
"A.",
""
],
[
"Meloni",
"D.",
""
],
[
"Migliozzi",
"P.",
""
]
] | We notice that looking for $\nu_e \to \nu_\tau$ at the same time as $\nu_e \to \nu_\mu$ oscillations could significantly help to reduce the errors in the leptonic CP-violating phase $\delta$ measurement. We show how the $\nu_e \to \nu_\mu$ (``golden'') and $\nu_e \to \nu_\tau$ (``silver'') transitions observed at an OPERA-like 2 Kton lead-emulsion detector at L = 732 Km, in combination with the $\nu_e \to \nu_\mu$ transitions observed at a 40 Kton magnetized iron detector with a baseline of L = 3000 Km, strongly reduce the so-called $(\theta_{13}, \delta)$ ambiguity. We also show how a moderate increase in the OPERA-like detector mass (4 Kton instead of 2 Kton) completely eliminates the clone regions even for small values of $\theta_{13}$. |
hep-ph/0212108 | Volker Burkert | V.D. Burkert, R. De Vita, M. Battaglieri, M. Ripani, V. Mokeev | Single Quark Transition Model Analysis of Electromagnetic Nucleon
Resonance Transitions in the [70,1-] Supermultiplet | 9 pages, 4 figures | Phys.Rev.C67:035204,2003 | 10.1103/PhysRevC.67.035204 | JLAB-PHY-02-23 | hep-ph nucl-ex nucl-th | null | We apply the single quark transition model to resonance transition amplitudes
extracted from photo-and electroproduction data. We use experimental data on
the S11(1535) and D13(1520) nucleon resonances to extract the amplitudes for
the electromagnetic transition from the nucleon ground state to the [70,1-]
SU(6)xO(3) supermultiplet, and make predictions for the transition amplitudes
of all other states associated with the [70,1-]. We find suprisingly good
agreement with the data.
| [
{
"created": "Sat, 7 Dec 2002 17:32:29 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Burkert",
"V. D.",
""
],
[
"De Vita",
"R.",
""
],
[
"Battaglieri",
"M.",
""
],
[
"Ripani",
"M.",
""
],
[
"Mokeev",
"V.",
""
]
] | We apply the single quark transition model to resonance transition amplitudes extracted from photo-and electroproduction data. We use experimental data on the S11(1535) and D13(1520) nucleon resonances to extract the amplitudes for the electromagnetic transition from the nucleon ground state to the [70,1-] SU(6)xO(3) supermultiplet, and make predictions for the transition amplitudes of all other states associated with the [70,1-]. We find suprisingly good agreement with the data. |
hep-ph/9907516 | Amir Fariborz | Deirdre Black, Amir H. Fariborz and Joseph Schechter | Mechanism for a next-to-lowest lying scalar meson nonet | 22 pages, 6 figures | Phys.Rev. D61 (2000) 074001 | 10.1103/PhysRevD.61.074001 | SU-4240-706 | hep-ph | null | Recent work suggests the existence of a non-conventional lowest-lying scalar
nonet containing the a0(980). Then the a0(1450) and also the K0*(1430) are
likely candidates to belong to a conventional p-wave $q \bar q$ nonet. However
a comparison of their properties with those expected on this basis reveals a
number of puzzling features. It is pointed out that these puzzles can be
resolved in a natural and robust way by assuming a ``bare'' conventional p-wave
scalar $q \bar q$ nonet to mix with a lighter four quark $qq \bar q \bar q$
scalar nonet to form new ``physical'' states. The essential mechanism is driven
by the fact that the isospinor is lighter than the isovector in the unmixed $qq
\bar q \bar q$ multiplet.
| [
{
"created": "Tue, 27 Jul 1999 16:23:45 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Black",
"Deirdre",
""
],
[
"Fariborz",
"Amir H.",
""
],
[
"Schechter",
"Joseph",
""
]
] | Recent work suggests the existence of a non-conventional lowest-lying scalar nonet containing the a0(980). Then the a0(1450) and also the K0*(1430) are likely candidates to belong to a conventional p-wave $q \bar q$ nonet. However a comparison of their properties with those expected on this basis reveals a number of puzzling features. It is pointed out that these puzzles can be resolved in a natural and robust way by assuming a ``bare'' conventional p-wave scalar $q \bar q$ nonet to mix with a lighter four quark $qq \bar q \bar q$ scalar nonet to form new ``physical'' states. The essential mechanism is driven by the fact that the isospinor is lighter than the isovector in the unmixed $qq \bar q \bar q$ multiplet. |
1307.2513 | Alexander Knochel | Alexander K Knochel | What can the Higgs tell us about UV physics? | Talk given at XXIX-th International Workshop on High Energy Physics
at IHEP, Protvino | null | 10.1142/9789814578745_0003 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After the discovery of a Higgs-like boson with a mass of m~125 GeV at the
LHC, we can now attempt to draw conclusions about physics beyond the Standard
Model. I argue that there are several hints towards new physics at intermediate
scales > 10^8 GeV. I review a class of stringy models with intermediate scale
SUSY which relate the observed Higgs mass to symmetries of the Higgs sector. I
then discuss radiative corrections to m_h, unification, dark matter and the
possibility of classically unstable UV completions in these models.
| [
{
"created": "Tue, 9 Jul 2013 16:43:03 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Knochel",
"Alexander K",
""
]
] | After the discovery of a Higgs-like boson with a mass of m~125 GeV at the LHC, we can now attempt to draw conclusions about physics beyond the Standard Model. I argue that there are several hints towards new physics at intermediate scales > 10^8 GeV. I review a class of stringy models with intermediate scale SUSY which relate the observed Higgs mass to symmetries of the Higgs sector. I then discuss radiative corrections to m_h, unification, dark matter and the possibility of classically unstable UV completions in these models. |
hep-ph/0108140 | Kenichiro Aoki | Kenichiro Aoki and Kenji Ito | Mass inequalities in two dimensional gauged four fermi models | 14pp, 5 figs | Phys.Rev. D65 (2002) 025003 | 10.1103/PhysRevD.65.025003 | null | hep-ph | null | We quantitatively analyze the meson mass inequality relations of two
dimensional gauged four fermi models in the large N limit. The class of models
we study includes the 't Hooft model, the chiral and non-chiral Gross-Neveu
models as special points in the space of field theories. Cases where the chiral
symmetry is spontaneously or explicitly broken are both studied. We study the
meson mass inequality quantitatively and define a susceptibility which allows
us to systematically analyze the inequality. In the generalized Gross-Neveu
model limit, we derive an analytic expression for this susceptibility. Even
though no analytic proof of the validity of the classic mass inequality exists
for the generic case, the mass inequality is found to be positive throughout
most of the parameter space. We point out that the inequality might be negative
in certain cases.
| [
{
"created": "Fri, 17 Aug 2001 05:18:43 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Aoki",
"Kenichiro",
""
],
[
"Ito",
"Kenji",
""
]
] | We quantitatively analyze the meson mass inequality relations of two dimensional gauged four fermi models in the large N limit. The class of models we study includes the 't Hooft model, the chiral and non-chiral Gross-Neveu models as special points in the space of field theories. Cases where the chiral symmetry is spontaneously or explicitly broken are both studied. We study the meson mass inequality quantitatively and define a susceptibility which allows us to systematically analyze the inequality. In the generalized Gross-Neveu model limit, we derive an analytic expression for this susceptibility. Even though no analytic proof of the validity of the classic mass inequality exists for the generic case, the mass inequality is found to be positive throughout most of the parameter space. We point out that the inequality might be negative in certain cases. |
1907.04603 | Alan D. Martin | V.A.Khoze, A.D.Martin, M.G.Ryskin | Colliding Pomerons | 7 pages, 1 figure, text improved, to be published in J.Phys.G-letters | null | 10.1088/1361-6471/ab3a88 | IPPP/19/60 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We recall the main properties of inclusive particle distributions expected
for Pomeron-proton and Pomeron-Pomeron interactions. Due to the small size of
the Pomeron we expect larger transverse momenta of secondaries and a smaller
probability of Multiple Interactions, that is a narrower multiplicity
distribution. We propose to compare the spectra of secondaries produced in the
Pomeron and the proton interactions in terms of the Feynman $x_F$ variable. The
main difference should be observed for a relatively large $x_F$, that is near
the edge of rapidity gaps. Such data offer the opportunity to illuminate the
properties of the `soft' or `Regge' Pomeron, which drives the minimum-bias type
of events in high energy $pp$ interactions. Besides this, there should be a
good opportunity to observe a glueball in the Pomeron fragmentation region.
| [
{
"created": "Wed, 10 Jul 2019 10:20:09 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Aug 2019 14:24:43 GMT",
"version": "v2"
}
] | 2019-08-14 | [
[
"Khoze",
"V. A.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Ryskin",
"M. G.",
""
]
] | We recall the main properties of inclusive particle distributions expected for Pomeron-proton and Pomeron-Pomeron interactions. Due to the small size of the Pomeron we expect larger transverse momenta of secondaries and a smaller probability of Multiple Interactions, that is a narrower multiplicity distribution. We propose to compare the spectra of secondaries produced in the Pomeron and the proton interactions in terms of the Feynman $x_F$ variable. The main difference should be observed for a relatively large $x_F$, that is near the edge of rapidity gaps. Such data offer the opportunity to illuminate the properties of the `soft' or `Regge' Pomeron, which drives the minimum-bias type of events in high energy $pp$ interactions. Besides this, there should be a good opportunity to observe a glueball in the Pomeron fragmentation region. |
1802.00945 | Tong Li | Tong Li | Type II Seesaw and tau lepton at the HL-LHC, HE-LHC and FCC-hh | 18 pages, 9 figures, 4 tables | null | 10.1007/JHEP09(2018)079 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The tau lepton plays important role in distinguishing neutrino mass patterns
and determining the chirality nature in heavy scalar mediated neutrino mass
models, in the light of the neutrino oscillation experiments and its
polarization measurement. We investigate the lepton flavor signatures with tau
lepton at LHC upgrades, i.e. HL-LHC, HE-LHC and FCC-hh, through leptonic
processes from doubly charged Higgs in the Type II Seesaw. We find that for the
channel with one tau lepton in final states, the accessible doubly charged
Higgs mass at HL-LHC can reach 655 GeV and 695 GeV for the neutrino mass
patterns of normal hierarchy (NH) and inverted hierarchy (IH) respectively,
with the luminosity of 3000 fb$^{-1}$. Higher masses, 975-1930 GeV for NH and
1035-2070 GeV for IH, can be achieved at HE-LHC and FCC-hh.
| [
{
"created": "Sat, 3 Feb 2018 09:49:31 GMT",
"version": "v1"
}
] | 2018-10-17 | [
[
"Li",
"Tong",
""
]
] | The tau lepton plays important role in distinguishing neutrino mass patterns and determining the chirality nature in heavy scalar mediated neutrino mass models, in the light of the neutrino oscillation experiments and its polarization measurement. We investigate the lepton flavor signatures with tau lepton at LHC upgrades, i.e. HL-LHC, HE-LHC and FCC-hh, through leptonic processes from doubly charged Higgs in the Type II Seesaw. We find that for the channel with one tau lepton in final states, the accessible doubly charged Higgs mass at HL-LHC can reach 655 GeV and 695 GeV for the neutrino mass patterns of normal hierarchy (NH) and inverted hierarchy (IH) respectively, with the luminosity of 3000 fb$^{-1}$. Higher masses, 975-1930 GeV for NH and 1035-2070 GeV for IH, can be achieved at HE-LHC and FCC-hh. |
2110.08799 | Jilberto Zamora-Saa | Gorazd Cveti\v{c} (1), C. S. Kim (2), Jiberto Zamora-Sa\'a (3) ((1)
Universidad T\'ecnica Federico Santa Mar\'ia, (2) Yonsei University, (3)
Universidad Andres Bello) | CP violation in the rare Higgs decays via exchange of on-shell almost
degenerate Majorana neutrinos, $H \to \nu_k N_j \to \nu_k \ell^{-} U {\bar
D}$ and $H \to \nu_k N_j \to \nu_k \ell^{+} {\bar U} D$ | null | Journal of High Energy Physics 2022, 168 (2022) | 10.1007/JHEP02(2022)168 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate rare decays of Higgs via exchange of two almost degenerate
heavy on-shell Majorana neutrinos $N_j$ ($j=1,2$): $\Gamma_{\pm} = \Gamma(h \to
\nu_k N_j \to \nu_k \ell^{\pm} \pi^{\mp})$, and into the open quark channels
$\Gamma_{\pm} = \Gamma(h \to \nu_k N_j \to \nu_k \ell^{\pm} U D)$, where $U D$
are two jets of open quarks (${\bar U} D$, or $U {\bar D}$, where $U=u, c$ and
$D=d, s$). The related CP violation asymmetry $A_{\rm CP} = (\Gamma_{-} -
\Gamma_{+})/(\Gamma_{-} + \Gamma_{+})$ is studied in detail. We take into
account the $N_1$-$N_2$ overlap and oscillation effects. We can see that for
certain, presently acceptable, range of input parameters, such decays with open
quark channels, and their asymmetries, could be detected in the International
Linear Collider (ILC).
| [
{
"created": "Sun, 17 Oct 2021 11:38:09 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Nov 2021 10:03:22 GMT",
"version": "v2"
}
] | 2022-02-25 | [
[
"Cvetič",
"Gorazd",
""
],
[
"Kim",
"C. S.",
""
],
[
"Zamora-Saá",
"Jiberto",
""
]
] | We investigate rare decays of Higgs via exchange of two almost degenerate heavy on-shell Majorana neutrinos $N_j$ ($j=1,2$): $\Gamma_{\pm} = \Gamma(h \to \nu_k N_j \to \nu_k \ell^{\pm} \pi^{\mp})$, and into the open quark channels $\Gamma_{\pm} = \Gamma(h \to \nu_k N_j \to \nu_k \ell^{\pm} U D)$, where $U D$ are two jets of open quarks (${\bar U} D$, or $U {\bar D}$, where $U=u, c$ and $D=d, s$). The related CP violation asymmetry $A_{\rm CP} = (\Gamma_{-} - \Gamma_{+})/(\Gamma_{-} + \Gamma_{+})$ is studied in detail. We take into account the $N_1$-$N_2$ overlap and oscillation effects. We can see that for certain, presently acceptable, range of input parameters, such decays with open quark channels, and their asymmetries, could be detected in the International Linear Collider (ILC). |
hep-ph/9711240 | null | F. Benatti and R. Floreanini | Completely positive dynamics of correlated neutral kaons | 28 pages, plain-TeX, no figures, to appear in Nucl. Phys. B | Nucl.Phys. B511 (1998) 550-576 | 10.1016/S0550-3213(97)00705-0 | null | hep-ph | null | We study the behaviour of correlated neutral kaons produced in phi-meson
decays under the hypothesis that the quantum mechanical time-evolution is
completely positive. We show that planned experiments at phi-factories could
give precise bounds on the phenomenological parameters of the model.
| [
{
"created": "Wed, 5 Nov 1997 12:49:26 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Benatti",
"F.",
""
],
[
"Floreanini",
"R.",
""
]
] | We study the behaviour of correlated neutral kaons produced in phi-meson decays under the hypothesis that the quantum mechanical time-evolution is completely positive. We show that planned experiments at phi-factories could give precise bounds on the phenomenological parameters of the model. |
hep-ph/0102238 | Kingman Cheung | Kingman Cheung (NCTS) | Muon Anomalous Magnetic Moment and Leptoquark Solutions | References added. The part on the atomic-parity violation is
re-analyzed with the updated data. A discussion on the radiative correction
to muon mass is addressed | Phys.Rev.D64:033001,2001 | 10.1103/PhysRevD.64.033001 | NSC-NCTS-010219 | hep-ph hep-ex | null | The recent measurement on the muon anomalous magnetic moment $a_\mu$ shows a
$2.6\sigma$ deviation from the standard model value. We show that it puts an
interesting bound on the mass of the second generation leptoquarks. To account
for the data the leptoquark must have both the left- and right-handed couplings
to the muon. Assuming that the couplings have electromagnetic strength, the
mass is restricted in the range $0.7 {\rm TeV} < M_{\rm LQ} < 2.2$ TeV at 95%
C.L. We also discuss constraints coming from other low energy and high energy
experiments. If the first-second-generation universality is assumed,
constraints come from the atomic parity violation and charged-current
universality. We show that coexistence with other leptoquarks can satisfy these
additional constraints and at the same time do not affect the $a_\mu$.
| [
{
"created": "Mon, 19 Feb 2001 17:42:08 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Mar 2001 08:13:46 GMT",
"version": "v2"
}
] | 2009-12-31 | [
[
"Cheung",
"Kingman",
"",
"NCTS"
]
] | The recent measurement on the muon anomalous magnetic moment $a_\mu$ shows a $2.6\sigma$ deviation from the standard model value. We show that it puts an interesting bound on the mass of the second generation leptoquarks. To account for the data the leptoquark must have both the left- and right-handed couplings to the muon. Assuming that the couplings have electromagnetic strength, the mass is restricted in the range $0.7 {\rm TeV} < M_{\rm LQ} < 2.2$ TeV at 95% C.L. We also discuss constraints coming from other low energy and high energy experiments. If the first-second-generation universality is assumed, constraints come from the atomic parity violation and charged-current universality. We show that coexistence with other leptoquarks can satisfy these additional constraints and at the same time do not affect the $a_\mu$. |
hep-ph/0111221 | Zhalov Michael | L. Frankfurt (TAU), M. Strikman (PSU), M. Zhalov (PNPI) | Fading out of J/psi color transparency in high energy heavy ion
peripheral collisions | 13 pages, 7 figures | Phys.Lett. B540 (2002) 220-226 | 10.1016/S0370-2693(02)02154-8 | null | hep-ph | null | We provide predictions for the J/psi coherent production in the peripheral
heavy ion collisions at LHC and at RHIC using the leading twist model of
nuclear shadowing based on the QCD factorization theorem for diffraction and
the HERA hard diffraction data. We demonstrate that for the LHC kinematics this
model leads to a bump-shape distribution in rapidity which is suppressed
overall as compared to the expectations of the color transparency regime by a
factor 6. This is significantly larger suppression than that expected within
the impact parameter eikonal model. Thus we show that the interaction of
spatially small wave package for which the total cross section of interaction
with nucleons is small is still strongly shadowed by nuclear medium in high
energy processes.
| [
{
"created": "Sun, 18 Nov 2001 22:42:46 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Frankfurt",
"L.",
"",
"TAU"
],
[
"Strikman",
"M.",
"",
"PSU"
],
[
"Zhalov",
"M.",
"",
"PNPI"
]
] | We provide predictions for the J/psi coherent production in the peripheral heavy ion collisions at LHC and at RHIC using the leading twist model of nuclear shadowing based on the QCD factorization theorem for diffraction and the HERA hard diffraction data. We demonstrate that for the LHC kinematics this model leads to a bump-shape distribution in rapidity which is suppressed overall as compared to the expectations of the color transparency regime by a factor 6. This is significantly larger suppression than that expected within the impact parameter eikonal model. Thus we show that the interaction of spatially small wave package for which the total cross section of interaction with nucleons is small is still strongly shadowed by nuclear medium in high energy processes. |
2301.06188 | Yevgeny Kats | Yevgeny Kats | Kinked tracks from $\Sigma^+$ baryons as a probe of light quark
polarizations | 18 pages; v2: minor improvements of presentation; published version | JHEP 2307 (2023) 018 | 10.1007/JHEP07(2023)018 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Jets initiated by energetic quarks carry in an obvious way approximate
information about the original quark energy and momentum. In a less obvious
way, they also carry information about the quark polarization. Previous works
have shown how the polarization information can be extracted by ATLAS and CMS
using events in which the quark hadronizes to an energetic baryon - $\Lambda_b$
for $b$ quarks, $\Lambda_c$ for $c$ quarks and $\Lambda$ for $s$ quarks. In
this paper we extend these proposals to $\Sigma^+$ baryons, which can provide
sensitivity to polarizations of $s$ and $u$ quarks. We analyze the various
aspects of how the kinked track signature of the $\Sigma^+ \to p \pi^0$ decay
can be used for this purpose. We evaluate the feasibility of such measurements
in $t\bar t$ samples.
| [
{
"created": "Sun, 15 Jan 2023 20:58:48 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Jul 2023 23:07:21 GMT",
"version": "v2"
}
] | 2023-07-11 | [
[
"Kats",
"Yevgeny",
""
]
] | Jets initiated by energetic quarks carry in an obvious way approximate information about the original quark energy and momentum. In a less obvious way, they also carry information about the quark polarization. Previous works have shown how the polarization information can be extracted by ATLAS and CMS using events in which the quark hadronizes to an energetic baryon - $\Lambda_b$ for $b$ quarks, $\Lambda_c$ for $c$ quarks and $\Lambda$ for $s$ quarks. In this paper we extend these proposals to $\Sigma^+$ baryons, which can provide sensitivity to polarizations of $s$ and $u$ quarks. We analyze the various aspects of how the kinked track signature of the $\Sigma^+ \to p \pi^0$ decay can be used for this purpose. We evaluate the feasibility of such measurements in $t\bar t$ samples. |
hep-ph/0305036 | Charles A. Nelson | Charles A. Nelson | Consequences of a Large Top-Quark Chiral Weak-Moment | Talk presented at "Les Recontres de la Valle d'Aoste", March 2003. 12
pages, 1 "ps" table; version 2 for minor corrections | null | null | SUNY BING 4/22/03 | hep-ph | null | This talk concerns some theoretical patterns of the helicity amplitudes for t
--> W b decay. The patterns involve both the standard model's four decay
helicity amplitudes, A_{SM}, and also the amplitudes A_{+} in the case of an
additional t_R --> b_L tensorial coupling of relative strength \Lambda_{+} =E_W
/2 = 53 GeV. Such an additional electroweak coupling would arise if the
observed top-quark has a large chiral weak-transition-moment. The A_{+}
amplitudes are interpreted as corresponding to the observed top-quark decays.
Three tWb-transformations A_{+}=M A_{SM}, ..., are used in simple
characterization of the values of \Lambda_{+}, and of the mass ratios m_W/m_t,
and m_b/m_t. Measurement of the sign of the \eta_L = +/- 0.46 helicity
parameter, respectively for SM/+, due to the large interference between the
W-longitudinal and W-transverse amplitudes, could exclude such a chiral
weak-transition-moment in favor of the SM prediction.
| [
{
"created": "Sat, 3 May 2003 20:54:06 GMT",
"version": "v1"
},
{
"created": "Mon, 19 May 2003 17:42:25 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Nelson",
"Charles A.",
""
]
] | This talk concerns some theoretical patterns of the helicity amplitudes for t --> W b decay. The patterns involve both the standard model's four decay helicity amplitudes, A_{SM}, and also the amplitudes A_{+} in the case of an additional t_R --> b_L tensorial coupling of relative strength \Lambda_{+} =E_W /2 = 53 GeV. Such an additional electroweak coupling would arise if the observed top-quark has a large chiral weak-transition-moment. The A_{+} amplitudes are interpreted as corresponding to the observed top-quark decays. Three tWb-transformations A_{+}=M A_{SM}, ..., are used in simple characterization of the values of \Lambda_{+}, and of the mass ratios m_W/m_t, and m_b/m_t. Measurement of the sign of the \eta_L = +/- 0.46 helicity parameter, respectively for SM/+, due to the large interference between the W-longitudinal and W-transverse amplitudes, could exclude such a chiral weak-transition-moment in favor of the SM prediction. |
1705.01605 | Hosein Karimi Khozani | Hosein Karimi Khozani | Implications of the complex Singlet field for Noncommutative Geometry
model | 2 figures, 2 pages | null | 10.1007/JHEP12(2017)040 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a complex singlet scalar in the spectral action approach to the
standard model. It is shown that there is a range of initial values at the
unification scale which is able to produce Higgs and top quark masses at low
energies. The stability of the vacuum and the deviation of gauge couplings from
experimental values are discussed and compared at the two-loop level with a
real scalar singlet and the pure standard model.
| [
{
"created": "Wed, 3 May 2017 20:18:32 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Oct 2017 20:44:14 GMT",
"version": "v2"
}
] | 2017-12-11 | [
[
"Khozani",
"Hosein Karimi",
""
]
] | We consider a complex singlet scalar in the spectral action approach to the standard model. It is shown that there is a range of initial values at the unification scale which is able to produce Higgs and top quark masses at low energies. The stability of the vacuum and the deviation of gauge couplings from experimental values are discussed and compared at the two-loop level with a real scalar singlet and the pure standard model. |
1609.09069 | Dario Gueter | Marco Drewes, Bjorn Garbrecht, Dario Gueter, Juraj Klaric | Testing the low scale seesaw and leptogenesis | We corrected errors in the experimental sensitivities and in the
discussion of the full testability of the model. We also added and updated
plots and references. 37 pages plus appendix, 12 figures | null | 10.1007/JHEP08(2017)018 | TUM-HEP-1062/16 | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Heavy neutrinos with masses below the electroweak scale can simultaneously
generate the light neutrino masses via the seesaw mechanism and the baryon
asymmetry of the universe via leptogenesis. The requirement to explain these
phenomena imposes constraints on the mass spectrum of the heavy neutrinos,
their flavour mixing pattern and their $CP$ properties. We first combine bounds
from different experiments in the past to map the viable parameter regions in
which the minimal low scale seesaw model can explain the observed neutrino
oscillations, while being consistent with the negative results of past searches
for physics beyond the Standard Model. We then study which additional
predictions for the properties of the heavy neutrinos can be made based on the
requirement to explain the observed baryon asymmetry of the universe. Finally,
we comment on the perspectives to find traces of heavy neutrinos in future
experimental searches at the LHC, NA62, BELLE II, T2K, SHiP or a future high
energy collider, such as ILC, CEPC or FCC-ee. If any heavy neutral leptons are
discovered in the future, our results can be used to assess whether these
particles are indeed the common origin of the light neutrino masses and the
baryon asymmetry of the universe. If the magnitude of their couplings to all
Standard Model flavours can be measured individually, and if the Dirac phase in
the lepton mixing matrix is determined in neutrino oscillation experiments,
then all model parameters can in principle be determined from this data. This
makes the low scale seesaw a fully testable model of neutrino masses and
baryogenesis.
| [
{
"created": "Wed, 28 Sep 2016 18:23:06 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Jan 2017 15:46:32 GMT",
"version": "v2"
}
] | 2017-09-13 | [
[
"Drewes",
"Marco",
""
],
[
"Garbrecht",
"Bjorn",
""
],
[
"Gueter",
"Dario",
""
],
[
"Klaric",
"Juraj",
""
]
] | Heavy neutrinos with masses below the electroweak scale can simultaneously generate the light neutrino masses via the seesaw mechanism and the baryon asymmetry of the universe via leptogenesis. The requirement to explain these phenomena imposes constraints on the mass spectrum of the heavy neutrinos, their flavour mixing pattern and their $CP$ properties. We first combine bounds from different experiments in the past to map the viable parameter regions in which the minimal low scale seesaw model can explain the observed neutrino oscillations, while being consistent with the negative results of past searches for physics beyond the Standard Model. We then study which additional predictions for the properties of the heavy neutrinos can be made based on the requirement to explain the observed baryon asymmetry of the universe. Finally, we comment on the perspectives to find traces of heavy neutrinos in future experimental searches at the LHC, NA62, BELLE II, T2K, SHiP or a future high energy collider, such as ILC, CEPC or FCC-ee. If any heavy neutral leptons are discovered in the future, our results can be used to assess whether these particles are indeed the common origin of the light neutrino masses and the baryon asymmetry of the universe. If the magnitude of their couplings to all Standard Model flavours can be measured individually, and if the Dirac phase in the lepton mixing matrix is determined in neutrino oscillation experiments, then all model parameters can in principle be determined from this data. This makes the low scale seesaw a fully testable model of neutrino masses and baryogenesis. |
1811.12289 | Kirill Semenov-Tian-Shansky | Jonas Linzen, Maxim V. Polyakov, Kirill M. Semenov-Tian-Shansky, and
Nika S. Sokolova | Exact summation of leading infrared logarithms in 2D effective field
theories | 22 pages, 2 figures | J. High Energ. Phys. (2019) 2019: 7 | 10.1007/JHEP04(2019)007 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A method of exact all-order summation of leading infrared logarithms in two
dimensional massless $\Phi^4$-type non-renormalizable effective field theories
(EFTs) is developed. The method is applied to the ${\rm O}(N)$-symmetric EFT,
which is a two-dimensional sibling of the four dimensional ${\rm O}(N+1)/{\rm
O}(N)$ sigma-model. For the first time the exact all-order summation of the
$\left(E^{2} \ln(1/E)\right)^n$ contributions (chiral logarithms) for the $2
\to 2$ scattering amplitudes is performed in closed analytical form. The cases
when the resulting amplitudes turn to be meromorphic functions with an infinite
number of poles (Landau poles) are identified. This provides the first explicit
example of quasi-renormalizable field theories.
| [
{
"created": "Thu, 29 Nov 2018 16:27:39 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Apr 2019 09:10:50 GMT",
"version": "v2"
}
] | 2019-04-05 | [
[
"Linzen",
"Jonas",
""
],
[
"Polyakov",
"Maxim V.",
""
],
[
"Semenov-Tian-Shansky",
"Kirill M.",
""
],
[
"Sokolova",
"Nika S.",
""
]
] | A method of exact all-order summation of leading infrared logarithms in two dimensional massless $\Phi^4$-type non-renormalizable effective field theories (EFTs) is developed. The method is applied to the ${\rm O}(N)$-symmetric EFT, which is a two-dimensional sibling of the four dimensional ${\rm O}(N+1)/{\rm O}(N)$ sigma-model. For the first time the exact all-order summation of the $\left(E^{2} \ln(1/E)\right)^n$ contributions (chiral logarithms) for the $2 \to 2$ scattering amplitudes is performed in closed analytical form. The cases when the resulting amplitudes turn to be meromorphic functions with an infinite number of poles (Landau poles) are identified. This provides the first explicit example of quasi-renormalizable field theories. |
hep-ph/0103256 | Jonathan R. Ellis | D.F. Carvalho (CFIF, IST, Lisboa, Portugal), John Ellis (CERN) M.E.
Gomez (CFIF, IST, Lisboa, Portugal) and S. Lola (CERN) | Charged-Lepton-Flavour Violation in the CMSSM in View of the Muon
Anomalous Magnetic Moment | 14 pages, 3 eps figures | Phys.Lett.B515:323-332,2001 | 10.1016/S0370-2693(01)00835-8 | CERN-TH/2001-085,FISIST/06-2001/CFIF | hep-ph hep-ex | null | We use the BNL E821 measurement of g - 2, the anomalous magnetic moment of
the muon, to normalize, within a supersymmetric GUT framework, constrained MSSM
(CMSSM) predictions for processes that violate charged-lepton flavour
conservation, including mu to e gamma, mu to e conversion and K^0_L to mu e. We
illustrate our analysis with two examples of lepton mass matrix textures
motivated by data on neutrino oscillations. We find that mu to e gamma may well
occur at a rate within one or two (two or three) orders of magnitude of the
present experimental upper limit if g - 2 is within the one- (two-)standard
deviation range indicated by E821. We also find that mu to e conversion is
likely to occur at rate measurable by MECO, and there is a chance that K^0_L to
mu e may be observable in an experiment using an intense proton source.
| [
{
"created": "Fri, 23 Mar 2001 15:54:21 GMT",
"version": "v1"
}
] | 2009-09-11 | [
[
"Carvalho",
"D. F.",
"",
"CFIF, IST, Lisboa, Portugal"
],
[
"Ellis",
"John",
"",
"CERN"
],
[
"Gomez",
"M. E.",
"",
"CFIF, IST, Lisboa, Portugal"
],
[
"Lola",
"S.",
"",
"CERN"
]
] | We use the BNL E821 measurement of g - 2, the anomalous magnetic moment of the muon, to normalize, within a supersymmetric GUT framework, constrained MSSM (CMSSM) predictions for processes that violate charged-lepton flavour conservation, including mu to e gamma, mu to e conversion and K^0_L to mu e. We illustrate our analysis with two examples of lepton mass matrix textures motivated by data on neutrino oscillations. We find that mu to e gamma may well occur at a rate within one or two (two or three) orders of magnitude of the present experimental upper limit if g - 2 is within the one- (two-)standard deviation range indicated by E821. We also find that mu to e conversion is likely to occur at rate measurable by MECO, and there is a chance that K^0_L to mu e may be observable in an experiment using an intense proton source. |
1309.4190 | Ilya Lvovich Shapiro | Ilya L. Shapiro | Renormalization in QED and QFT with a Lorentz- and CPT-violating
backgrounds | 4 pages, WS styles, Presented at the Sixth Meeting on CPT and Lorentz
Symmetry,Bloomington, Indiana, June 17-21, 2013 | null | 10.1142/9789814566438_0046 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The general features of renormalization and the renormalization group in QED
and in general quantum field theories in curved spacetime with additional
Lorentz- and CPT-violating background fields are reviewed.
| [
{
"created": "Tue, 17 Sep 2013 05:43:31 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Shapiro",
"Ilya L.",
""
]
] | The general features of renormalization and the renormalization group in QED and in general quantum field theories in curved spacetime with additional Lorentz- and CPT-violating background fields are reviewed. |
hep-ph/9408381 | Teng Hong-bo | Bin Chen, Han-Ying Guo and Hong-Bo Teng | A Gauge Field Model On $SU(2)_L\times SU(2)_R\times U(1)_Y \times
\pi_4(G_{YM})$ | 9 pages, LATEX | null | null | null | hep-ph | null | We construct a gauge field model based on $SU(2)_L\times SU(2)_R\times U(1)_Y
\times \pi_4(SU(2)_L\times SU(2)_R\times U(1)_Y) $ from the principle that both
the original gauge group $G_{YM}$ and the discrete group $\pi_4(G_{YM})$ should
be taken as gauge groups in the sense of non-commutative geometry. We show that
the Yukawa coupling and the Higgs mechanism appear as natural results.
| [
{
"created": "Sun, 28 Aug 1994 13:55:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chen",
"Bin",
""
],
[
"Guo",
"Han-Ying",
""
],
[
"Teng",
"Hong-Bo",
""
]
] | We construct a gauge field model based on $SU(2)_L\times SU(2)_R\times U(1)_Y \times \pi_4(SU(2)_L\times SU(2)_R\times U(1)_Y) $ from the principle that both the original gauge group $G_{YM}$ and the discrete group $\pi_4(G_{YM})$ should be taken as gauge groups in the sense of non-commutative geometry. We show that the Yukawa coupling and the Higgs mechanism appear as natural results. |
1903.03921 | Yuji Shi | Yu-Ji Shi, Ye Xing, Zhen-Xing Zhao | Light-Cone Sum Rules Analysis of
$\Xi_{QQ^{\prime}q}\to\Lambda_{Q^{\prime}}$ Weak Decays | 19 pages, 3 figures, 7 tables | null | 10.1140/epjc/s10052-019-7014-y | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the weak decay of doubly-heavy baryon decays into anti-triplets
$\Lambda_Q$ with light-cone sum rules. To calculate the decay form factors,
both bottom and charmed anti-triplets $\Lambda_b$ and $\Lambda_c$ are described
by the same set of leading twist light-cone distribution functions. With the
obtained form factors, we perform a phenomenology study on the corresponding
semi-leptonic decays. The decay widths are calculated and the branching ratios
given in this work are expected to be tested by future experimental data, which
will help us to understand the underlying dynamics in doubly-heavy baryon
decays.
| [
{
"created": "Sun, 10 Mar 2019 04:40:07 GMT",
"version": "v1"
}
] | 2019-07-24 | [
[
"Shi",
"Yu-Ji",
""
],
[
"Xing",
"Ye",
""
],
[
"Zhao",
"Zhen-Xing",
""
]
] | We analyze the weak decay of doubly-heavy baryon decays into anti-triplets $\Lambda_Q$ with light-cone sum rules. To calculate the decay form factors, both bottom and charmed anti-triplets $\Lambda_b$ and $\Lambda_c$ are described by the same set of leading twist light-cone distribution functions. With the obtained form factors, we perform a phenomenology study on the corresponding semi-leptonic decays. The decay widths are calculated and the branching ratios given in this work are expected to be tested by future experimental data, which will help us to understand the underlying dynamics in doubly-heavy baryon decays. |
1807.09246 | Chris White | Nadia Bahjat-Abbas, J. Sinninghe Damst\'e, Leonardo Vernazza and Chris
D. White | On next-to-leading power threshold corrections in Drell-Yan production
at N$^3$LO | 41 pages, 4 figures | null | 10.1007/JHEP10(2018)144 | QMUL-PH-18-13, NIKHEF/2018-038 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The cross-section for Drell-Yan production of a vector boson has been
previously calculated at next-to-next-to-leading order, supplemented by
enhanced logarithmic terms associated with the threshold region. In this paper,
we calculate a large set of enhanced terms associated with the colour structure
$C_F^3$ at N$^3$LO, for the double real emission contribution in the
quark-antiquark channel, as an expansion around the threshold region up to and
including the first subleading power. We perform our calculation using the
method of regions, which systematically characterises all contributions
according to whether the virtual gluon is (next-to) soft, collinear or hard in
nature. Our results will prove useful for developing general formalisms for
classifying next-to-leading power (NLP) threshold effects. They are also
interesting in their own right, given that they constitute a previously unknown
contribution to the Drell-Yan cross-section at ${\cal O}(\alpha_s^3)$.
| [
{
"created": "Tue, 24 Jul 2018 17:30:19 GMT",
"version": "v1"
}
] | 2018-11-14 | [
[
"Bahjat-Abbas",
"Nadia",
""
],
[
"Damsté",
"J. Sinninghe",
""
],
[
"Vernazza",
"Leonardo",
""
],
[
"White",
"Chris D.",
""
]
] | The cross-section for Drell-Yan production of a vector boson has been previously calculated at next-to-next-to-leading order, supplemented by enhanced logarithmic terms associated with the threshold region. In this paper, we calculate a large set of enhanced terms associated with the colour structure $C_F^3$ at N$^3$LO, for the double real emission contribution in the quark-antiquark channel, as an expansion around the threshold region up to and including the first subleading power. We perform our calculation using the method of regions, which systematically characterises all contributions according to whether the virtual gluon is (next-to) soft, collinear or hard in nature. Our results will prove useful for developing general formalisms for classifying next-to-leading power (NLP) threshold effects. They are also interesting in their own right, given that they constitute a previously unknown contribution to the Drell-Yan cross-section at ${\cal O}(\alpha_s^3)$. |
1801.03492 | Carlos Tamarit | David G. Cerdeno, Peter Reimitz, Kazuki Sakurai, Carlos Tamarit | $B+L$ violation at colliders and new physics | 54 pages, 6 figures. V2: Published version. Added references,
discussions on collider bounds | JHEP 04 (2018) 076 | 10.1007/JHEP04(2018)076 | IPPP-17-101, DCTP-17-202, TUM-HEP-1126/18 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Chiral electroweak anomalies predict fermion interactions that violate baryon
($B$) and lepton number ($L$), and can be dressed with large numbers of Higgs
and gauge bosons. The estimation of the total $B+L$ violating rate from an
initial two-particle state --potentially observable at colliders-- has been the
subject of an intense discussion, mainly centered on the resummation of boson
emission, which is believed to contribute to the cross-section with an
exponential function of the energy, yet with an exponent (the "holy-grail"
function) which is not fully known in the energy range of interest. In this
article we focus instead on the effect of fermions beyond the Standard-Model
(SM) in the polynomial contributions to the rate. It is shown that $B+L$
processes involving the new fermions have a polynomial contribution that can be
several orders of magnitude greater than in the SM, for high centre-of-mass
energies and light enough masses. We also present calculations that hint at a
simple dependence of the holy grail function on the heavy fermion masses. Thus,
if anomalous $B+L$ violating interactions are ever detected at high-energy
colliders, they could be associated with new physics.
| [
{
"created": "Wed, 10 Jan 2018 18:47:41 GMT",
"version": "v1"
},
{
"created": "Mon, 7 May 2018 12:03:42 GMT",
"version": "v2"
}
] | 2018-05-08 | [
[
"Cerdeno",
"David G.",
""
],
[
"Reimitz",
"Peter",
""
],
[
"Sakurai",
"Kazuki",
""
],
[
"Tamarit",
"Carlos",
""
]
] | Chiral electroweak anomalies predict fermion interactions that violate baryon ($B$) and lepton number ($L$), and can be dressed with large numbers of Higgs and gauge bosons. The estimation of the total $B+L$ violating rate from an initial two-particle state --potentially observable at colliders-- has been the subject of an intense discussion, mainly centered on the resummation of boson emission, which is believed to contribute to the cross-section with an exponential function of the energy, yet with an exponent (the "holy-grail" function) which is not fully known in the energy range of interest. In this article we focus instead on the effect of fermions beyond the Standard-Model (SM) in the polynomial contributions to the rate. It is shown that $B+L$ processes involving the new fermions have a polynomial contribution that can be several orders of magnitude greater than in the SM, for high centre-of-mass energies and light enough masses. We also present calculations that hint at a simple dependence of the holy grail function on the heavy fermion masses. Thus, if anomalous $B+L$ violating interactions are ever detected at high-energy colliders, they could be associated with new physics. |
1911.06063 | Keval Gandhi | Keval Gandhi and Ajay Kumar Rai | Strong decays analysis of excited nonstrange charmed mesons:
Implications for spectroscopy | 25 pages | Eur. Phys. J. A (2021) 57:23 | 10.1140/epja/s10050-020-00332-4 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The strong decays of $D_1(2420)^0$, $D_2^*(2460)^0$, $D_2^*(2460)^+$,
$D_2^*(2460)^-$, $D(2550)^0$, $D_J^*(2600)^0$, $D(2740)^0$, $D_3^*(2750)^0$,
$D_3^*(2750)^+$, $D_3^*(2750)^-$, $D_J(3000)^0$, $D{_{J}^*}(3000)^0$ and
$D_2^*(3000)^0$ resonance states are analyzed in the heavy quark mass limit of
Heavy Quark Effective Theory (HQET). The individual decay rates and the
branching ratios among the strong decays determine their spin and parity. From
such states the Regge trajectories are constructed in $(J, M^2)$ and $(n_r,
M^2)$ planes and further predict the masses of higher excited states (1$^1D_2$,
1$^3D_3$, 3$^1S_0$, 3$^3S_1$, 1$^1F_3$, 1$^3F_4$, 2$^3D_3$, 3$^3P_2$ and
2$^3F_4$) lying on Regge lines by fixing their slopes and intercepts. Moreover,
the strong decay rates and the branching ratios of these higher excited states
are also examined, which can help the experimentalists to search these states
into their respective decay modes.
| [
{
"created": "Thu, 14 Nov 2019 12:27:52 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Nov 2019 16:28:25 GMT",
"version": "v2"
}
] | 2021-04-07 | [
[
"Gandhi",
"Keval",
""
],
[
"Rai",
"Ajay Kumar",
""
]
] | The strong decays of $D_1(2420)^0$, $D_2^*(2460)^0$, $D_2^*(2460)^+$, $D_2^*(2460)^-$, $D(2550)^0$, $D_J^*(2600)^0$, $D(2740)^0$, $D_3^*(2750)^0$, $D_3^*(2750)^+$, $D_3^*(2750)^-$, $D_J(3000)^0$, $D{_{J}^*}(3000)^0$ and $D_2^*(3000)^0$ resonance states are analyzed in the heavy quark mass limit of Heavy Quark Effective Theory (HQET). The individual decay rates and the branching ratios among the strong decays determine their spin and parity. From such states the Regge trajectories are constructed in $(J, M^2)$ and $(n_r, M^2)$ planes and further predict the masses of higher excited states (1$^1D_2$, 1$^3D_3$, 3$^1S_0$, 3$^3S_1$, 1$^1F_3$, 1$^3F_4$, 2$^3D_3$, 3$^3P_2$ and 2$^3F_4$) lying on Regge lines by fixing their slopes and intercepts. Moreover, the strong decay rates and the branching ratios of these higher excited states are also examined, which can help the experimentalists to search these states into their respective decay modes. |
0709.2085 | Paolo Nason | P. Nason | MINT: a Computer Program for Adaptive Monte Carlo Integration and
Generation of Unweighted Distributions | 7 pages, no figures | null | null | Bicocca-FT-07-13 | hep-ph | null | In this note I illustrate the program MINT, a FORTRAN program for Monte Carlo
adaptive integration and generation of unweighted distributions.
| [
{
"created": "Thu, 13 Sep 2007 17:47:56 GMT",
"version": "v1"
}
] | 2007-09-14 | [
[
"Nason",
"P.",
""
]
] | In this note I illustrate the program MINT, a FORTRAN program for Monte Carlo adaptive integration and generation of unweighted distributions. |
1606.05388 | Olga Guadalupe F\'elix Beltr\'an Dr. | E. Barradas-Guevara, O. F\'elix-Beltr\'an, F. Gonzalez-Canales, E.
Gonz\'alez- Hern\'andez, E. Rodr\'iguez-J\'auregui, M. Zeleny-Mora | Analysis of the Lepton Mixing Matrix in the Two Higgs Doublet Model | 10 pages, 2 figures | Journal of Nuclear Physics, Material Sciences, Radiation and
ApplicationsVol. 4 No.-1 pp 203-219 (2016) | 10.15415/jnp.2016.41021 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the theoretical framework of Two Higgs Doublet Model (2HDM) plus three
right-handed neutrinos we consider a universal treatment for the mass matrices,
aside from that the active neutrinos acquire their small mass through the
type-I seesaw mechanism. Then, as long as a matrix with four-zero texture is
used to represent the right-handed neutrinos and Yukawa matrices, we obtain a
unified treatment where all fermion mass matrices have four-zero texture. We
obtain analytical and explicit expressions for the lepton flavour mixing matrix
PMNS in terms of fermion masses and parameters associated with the 2HDM-III.
Further, we compare these expressions of the PMNS matrix with the most up to
date values of masses and mixing in the lepton sector, via a likelihood test
$\chi^{2}$. We find that the analytical expressions that we derived reproduce
remarkably well the most recent experimental data of neutrino oscillations.
| [
{
"created": "Fri, 17 Jun 2016 00:17:12 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jun 2016 18:12:29 GMT",
"version": "v2"
}
] | 2017-03-07 | [
[
"Barradas-Guevara",
"E.",
""
],
[
"Félix-Beltrán",
"O.",
""
],
[
"Gonzalez-Canales",
"F.",
""
],
[
"Hernández",
"E. González-",
""
],
[
"Rodríguez-Jáuregui",
"E.",
""
],
[
"Zeleny-Mora",
"M.",
""
]
] | In the theoretical framework of Two Higgs Doublet Model (2HDM) plus three right-handed neutrinos we consider a universal treatment for the mass matrices, aside from that the active neutrinos acquire their small mass through the type-I seesaw mechanism. Then, as long as a matrix with four-zero texture is used to represent the right-handed neutrinos and Yukawa matrices, we obtain a unified treatment where all fermion mass matrices have four-zero texture. We obtain analytical and explicit expressions for the lepton flavour mixing matrix PMNS in terms of fermion masses and parameters associated with the 2HDM-III. Further, we compare these expressions of the PMNS matrix with the most up to date values of masses and mixing in the lepton sector, via a likelihood test $\chi^{2}$. We find that the analytical expressions that we derived reproduce remarkably well the most recent experimental data of neutrino oscillations. |
2212.09300 | Anatoly Butkevich | A. V. Butkevich | Flux-integrated semiexclusive cross sections for charged-current
quasielastic and neutral-current elastic neutrino scattering off ${}^{40}$Ar
and a sterile neutrino oscillation study | 27 pages 10 figures. arXiv admin note: text overlap with
arXiv:1106.0976 | null | 10.1103/PhysRevD.107.073001 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Flux-integrated semiexclusive differential cross sections for charged-current
quasielastic and neutral-current elastic neutrino scattering on argon are
analyzed. The cross sections are calculated using the relativistic
distorted-wave impulse approximation with values of the nucleon axial mass
$M_A=1$ GeV and 1.2 GeV. The elastic scattering cross sections are also
computed for different strange quark contributions to the neutral-current axial
form factor. The flux-integrated differential cross sections as functions of
reconstructed neutrino energy are evaluated for the far detector of the SBN
experiment. The effects of the short base-line neutrino oscillations are taken
into account in a 3+1 framework. We found that cross sections depend on
oscillation parameters and the ratio of the measured and predicted cross
sections can be used in a sterile neutrino oscillation study.
| [
{
"created": "Mon, 19 Dec 2022 08:36:35 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jan 2023 09:18:37 GMT",
"version": "v2"
}
] | 2023-04-19 | [
[
"Butkevich",
"A. V.",
""
]
] | Flux-integrated semiexclusive differential cross sections for charged-current quasielastic and neutral-current elastic neutrino scattering on argon are analyzed. The cross sections are calculated using the relativistic distorted-wave impulse approximation with values of the nucleon axial mass $M_A=1$ GeV and 1.2 GeV. The elastic scattering cross sections are also computed for different strange quark contributions to the neutral-current axial form factor. The flux-integrated differential cross sections as functions of reconstructed neutrino energy are evaluated for the far detector of the SBN experiment. The effects of the short base-line neutrino oscillations are taken into account in a 3+1 framework. We found that cross sections depend on oscillation parameters and the ratio of the measured and predicted cross sections can be used in a sterile neutrino oscillation study. |
1809.05272 | Stefan Groote Dr. | Stefan Groote and J\"urgen G. K\"orner | NLO and NNLO corrections to polarized top quark decays | 7 pages, 4 figures, contribution to "QCD@Work 2018", International
Workshop on QCD Theory and Experiment. 25-28 June 2018. Matera, Italy | null | 10.1051/epjconf/201819200006 | MITP/18-087 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present partial results on NLO and NNLO QCD, and NLO electroweak
corrections to polarized top quark decays. In parallel we derive positivity
bounds for the polarized structure functions in polarized top quark decays and
check them against the perturbative corrections to the structure functions.
| [
{
"created": "Fri, 14 Sep 2018 06:36:13 GMT",
"version": "v1"
}
] | 2018-12-05 | [
[
"Groote",
"Stefan",
""
],
[
"Körner",
"Jürgen G.",
""
]
] | We present partial results on NLO and NNLO QCD, and NLO electroweak corrections to polarized top quark decays. In parallel we derive positivity bounds for the polarized structure functions in polarized top quark decays and check them against the perturbative corrections to the structure functions. |
hep-ph/0602236 | Gabriela Navarro | X. Jiang, G. A. Navarro, R. Sassot | Sea quark polarization and semi-inclusive DIS data | 7 pages, 4 figures. Version to be published in the European Physical
Journal C | Eur.Phys.J.C47:81-85,2006 | 10.1140/epjc/s2006-02525-7 | null | hep-ph | null | We investigate the potential impact of forthcoming Jefferson Lab
semi-inclusive polarized deep inelastic scattering proton measurements in the
determination of the sea quark polarization in the nucleon by means of a next
to leading order global QCD analysis. Specifically, we estimate the resulting
improvement in the constraints on polarized parton densities for the different
flavors, which is found to be significant for up and strange quarks, and the
correlation between remaining uncertainty ranges for each of the parton
species.
| [
{
"created": "Mon, 27 Feb 2006 18:10:05 GMT",
"version": "v1"
}
] | 2009-01-07 | [
[
"Jiang",
"X.",
""
],
[
"Navarro",
"G. A.",
""
],
[
"Sassot",
"R.",
""
]
] | We investigate the potential impact of forthcoming Jefferson Lab semi-inclusive polarized deep inelastic scattering proton measurements in the determination of the sea quark polarization in the nucleon by means of a next to leading order global QCD analysis. Specifically, we estimate the resulting improvement in the constraints on polarized parton densities for the different flavors, which is found to be significant for up and strange quarks, and the correlation between remaining uncertainty ranges for each of the parton species. |
1905.10300 | Anders Kvellestad | Anders Kvellestad (for the GAMBIT Collaboration) | Exploring light supersymmetry with GAMBIT | 4 pages, 1 figure, contribution to the 2019 QCD session of the 54th
Rencontres de Moriond | null | null | gambit-proceedings-2019 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I summarize a recent study by the GAMBIT Collaboration in which we
investigated the combined collider constraints on the chargino and neutralino
sector of the Minimal Supersymmetric Standard Model. Through a large fit using
GAMBIT we found that current ATLAS and CMS results with 36 fb$^{-1}$ of 13 TeV
LHC collision data do not provide a general constraint on the lightest
neutralino and chargino masses. Further, we found that a pattern of excesses in
some of the LHC analyses can be fit in a subset of the model parameter space.
The excess has an estimated local significance of 3.3$\sigma$ based on the 13
TeV results alone, and 2.9$\sigma$ when 13 TeV and 8 TeV results are combined.
| [
{
"created": "Fri, 24 May 2019 15:54:38 GMT",
"version": "v1"
}
] | 2020-08-27 | [
[
"Kvellestad",
"Anders",
"",
"for the GAMBIT Collaboration"
]
] | I summarize a recent study by the GAMBIT Collaboration in which we investigated the combined collider constraints on the chargino and neutralino sector of the Minimal Supersymmetric Standard Model. Through a large fit using GAMBIT we found that current ATLAS and CMS results with 36 fb$^{-1}$ of 13 TeV LHC collision data do not provide a general constraint on the lightest neutralino and chargino masses. Further, we found that a pattern of excesses in some of the LHC analyses can be fit in a subset of the model parameter space. The excess has an estimated local significance of 3.3$\sigma$ based on the 13 TeV results alone, and 2.9$\sigma$ when 13 TeV and 8 TeV results are combined. |
0805.0964 | Francesco Becattini | F. Becattini (University and INFN Florence), P. Castorina (University
and INFN Catania), J. Manninen (INFN Florence), H. Satz (University of
Bielefeld) | The Thermal Production of Strange and Non-Strange Hadrons in e+e-
Collisions | 26 pages, 6 figures | Eur.Phys.J.C56:493-510,2008 | 10.1140/epjc/s10052-008-0671-x | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The thermal multihadron production observed in different high energy
collisions poses two basic problems: (1) why do even elementary collisions with
comparatively few secondaries (e+e- annihilation) show thermal behaviour, and
2) why is there in such interactions a suppression of strange particle
production? We show that the recently proposed mechanism of thermal hadron
production through Hawking-Unruh radiation can naturally account for both. The
event horizon of colour confinement leads to thermal behaviour, but the
resulting temperature depends on the strange quark content of the produced
hadrons, causing a deviation from full equilibrium and hence a suppression of
strange particle production. We apply the resulting formalism to multihadron
production in e+e- annihilation over a wide energy range and make a
comprehensive analysis of the data in the conventional statistical
hadronization model and the modified Hawking-Unruh formulation. We show that
this formulation provides a very good description of the measured hadronic
abundances, fully determined in terms of the string tension and the bare
strange quark mass; it contains no adjustable parameters.
| [
{
"created": "Wed, 7 May 2008 11:59:58 GMT",
"version": "v1"
}
] | 2009-01-22 | [
[
"Becattini",
"F.",
"",
"University and INFN Florence"
],
[
"Castorina",
"P.",
"",
"University\n and INFN Catania"
],
[
"Manninen",
"J.",
"",
"INFN Florence"
],
[
"Satz",
"H.",
"",
"University of\n Bielefeld"
]
] | The thermal multihadron production observed in different high energy collisions poses two basic problems: (1) why do even elementary collisions with comparatively few secondaries (e+e- annihilation) show thermal behaviour, and 2) why is there in such interactions a suppression of strange particle production? We show that the recently proposed mechanism of thermal hadron production through Hawking-Unruh radiation can naturally account for both. The event horizon of colour confinement leads to thermal behaviour, but the resulting temperature depends on the strange quark content of the produced hadrons, causing a deviation from full equilibrium and hence a suppression of strange particle production. We apply the resulting formalism to multihadron production in e+e- annihilation over a wide energy range and make a comprehensive analysis of the data in the conventional statistical hadronization model and the modified Hawking-Unruh formulation. We show that this formulation provides a very good description of the measured hadronic abundances, fully determined in terms of the string tension and the bare strange quark mass; it contains no adjustable parameters. |
1804.03660 | Peter Denton | Peter B. Denton, Yasaman Farzan, Ian M. Shoemaker | A Plan to Rule out Large Non-Standard Neutrino Interactions After
COHERENT Data | 18 pages, 7 figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the presence of neutrino Non-Standard Interactions (NSI) with matter, the
derivation of neutrino parameters from oscillation data must be reconsidered.
In particular, along with the standard solution to neutrino oscillation,
another solution known as "LMA--Dark" is compatible with global oscillation
data and requires both $\theta_{12}>\pi/4$ and a certain flavor pattern of NSI
with an effective coupling comparable to $G_F$. Contrary to conventional
expectations, there is a class of models based on a new $U(1)_X$ gauge symmetry
with a gauge boson of mass of few MeV to few 10 MeV that can viably give rise
to such large NSI. These models can in principle be tested by Coherent Elastic
$\nu$-Nucleus Scattering (CE$\nu$NS) experiments such as COHERENT and the
upcoming reactor neutrino experiment, CONUS. We analyze how the recent results
from the COHERENT experiment constrain these models and forecast the discovery
potential with future measurements from COHERENT and CONUS. We also derive the
constraints from COHERENT on lepton flavor violating NSI.
| [
{
"created": "Tue, 10 Apr 2018 18:00:01 GMT",
"version": "v1"
}
] | 2018-04-12 | [
[
"Denton",
"Peter B.",
""
],
[
"Farzan",
"Yasaman",
""
],
[
"Shoemaker",
"Ian M.",
""
]
] | In the presence of neutrino Non-Standard Interactions (NSI) with matter, the derivation of neutrino parameters from oscillation data must be reconsidered. In particular, along with the standard solution to neutrino oscillation, another solution known as "LMA--Dark" is compatible with global oscillation data and requires both $\theta_{12}>\pi/4$ and a certain flavor pattern of NSI with an effective coupling comparable to $G_F$. Contrary to conventional expectations, there is a class of models based on a new $U(1)_X$ gauge symmetry with a gauge boson of mass of few MeV to few 10 MeV that can viably give rise to such large NSI. These models can in principle be tested by Coherent Elastic $\nu$-Nucleus Scattering (CE$\nu$NS) experiments such as COHERENT and the upcoming reactor neutrino experiment, CONUS. We analyze how the recent results from the COHERENT experiment constrain these models and forecast the discovery potential with future measurements from COHERENT and CONUS. We also derive the constraints from COHERENT on lepton flavor violating NSI. |
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