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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9801319 | Gao Yanming | Zhou Yufeng, Peng Hongan, Liu Lianshou | The Contribution of Reggeon in Charge Exchange Processes | 10 pages 6 figures in 2 separate PS files | null | null | HZPP-9801 | hep-ph | null | We discuss in this paper The experimental results on maximum psedo-rapidity
$\eta_{max}$ distribution in the charge exchange process $e+p\to e+n+X$ in ZEUS
Collaboration at HERA. We calculate the contributions of \regg ($\rho$-Reggeon
associated with $\rho$ meson) from regge phenomenology and $\pi^{+}$-exchange
from pion cloud model. The results show that neither the \regg-exchange nor the
pion cloud model alone can explain the experimental data well, but after
considering both these two processes together, by using Monte Carlo simulation,
a good agreement between theoretical results and experimental data is found.
This means that in discussing the large rapidity gap phenomena in deep
inelastic scattering, both of the two processes play substantial role.
| [
{
"created": "Fri, 16 Jan 1998 01:45:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Yufeng",
"Zhou",
""
],
[
"Hongan",
"Peng",
""
],
[
"Lianshou",
"Liu",
""
]
] | We discuss in this paper The experimental results on maximum psedo-rapidity $\eta_{max}$ distribution in the charge exchange process $e+p\to e+n+X$ in ZEUS Collaboration at HERA. We calculate the contributions of \regg ($\rho$-Reggeon associated with $\rho$ meson) from regge phenomenology and $\pi^{+}$-exchange from pion cloud model. The results show that neither the \regg-exchange nor the pion cloud model alone can explain the experimental data well, but after considering both these two processes together, by using Monte Carlo simulation, a good agreement between theoretical results and experimental data is found. This means that in discussing the large rapidity gap phenomena in deep inelastic scattering, both of the two processes play substantial role. |
hep-ph/0504070 | Gouranga Nayak | Gouranga C. Nayak (SUNY, Stony Brook) and Peter van Nieuwenhuizen
(SUNY, Stony Brook) | Soft-Gluon Production Due to a Gluon Loop in a Constant Chromo-Electric
Background Field | 8 pages latex, Final Version to appear in Phys. Rev. D | Phys.Rev. D71 (2005) 125001 | 10.1103/PhysRevD.71.125001 | YITP-SB-05-09 | hep-ph hep-th nucl-th | null | We obtain an exact result for the soft gluon production and its p_T
distribution due to a gluon loop in a constant chromo-electric background field
E^a with arbitrary color. Unlike Schwinger's result for e^+e^- pair production
in QED which depends only on one gauge invariant quantity, the Electric field
E, we find that the p_T distribution of the gluons depend on two gauge
invariant quantities, E^aE^a and [d_{abc}E^aE^bE^c]^2.
| [
{
"created": "Sat, 9 Apr 2005 20:20:50 GMT",
"version": "v1"
},
{
"created": "Tue, 24 May 2005 20:04:04 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Nayak",
"Gouranga C.",
"",
"SUNY, Stony Brook"
],
[
"van Nieuwenhuizen",
"Peter",
"",
"SUNY, Stony Brook"
]
] | We obtain an exact result for the soft gluon production and its p_T distribution due to a gluon loop in a constant chromo-electric background field E^a with arbitrary color. Unlike Schwinger's result for e^+e^- pair production in QED which depends only on one gauge invariant quantity, the Electric field E, we find that the p_T distribution of the gluons depend on two gauge invariant quantities, E^aE^a and [d_{abc}E^aE^bE^c]^2. |
1207.4996 | Brian C. Tiburzi | B. C. Tiburzi | Isotensor Hadronic Parity Violation | 4 pages, 2 figures, brief report, v2. version to be published | null | 10.1103/PhysRevD.86.097501 | RBRC-962 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Weak interactions between quarks give rise to hadronic parity violation which
can be observed in nuclear and few-nucleon systems. We study the QCD
renormalization of the isotensor component of parity violation at
next-to-leading order accuracy. The renormalization group is employed to evolve
the interaction down to hadronic scales. As the results are renormalization
scheme dependent, we compare various schemes, including 't Hooft-Veltman
dimensional regularization, and several regularization independent-momentum
subtraction schemes.
| [
{
"created": "Fri, 20 Jul 2012 16:54:37 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Oct 2012 15:13:51 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Tiburzi",
"B. C.",
""
]
] | Weak interactions between quarks give rise to hadronic parity violation which can be observed in nuclear and few-nucleon systems. We study the QCD renormalization of the isotensor component of parity violation at next-to-leading order accuracy. The renormalization group is employed to evolve the interaction down to hadronic scales. As the results are renormalization scheme dependent, we compare various schemes, including 't Hooft-Veltman dimensional regularization, and several regularization independent-momentum subtraction schemes. |
hep-ph/0502057 | Magdalena Sowa | M. Sowa | Influence of charming penguins on the extraction of gamma in B->PP
decays | 9 pages, 3 eps figures | Acta Phys.Polon. B36 (2005) 817-826 | null | null | hep-ph | null | Charmless B->PP decays are studied using flavor SU(3) symmetry. Amplitude
with charming penguin topology is considered for two cases: with zero and with
arbitrary strong phase. Two sets of data (an older and the most recent one) are
used in the fits, so that the stability of the fits is tested. It is shown that
within the present uncertainties in the data the parameters of the fit may be
significantly modified, especially the gamma angle. The fits indicate the
strong phase of the charming penguin amplitude to be around $\pm 20^{o}$.
| [
{
"created": "Sun, 6 Feb 2005 16:53:52 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Sowa",
"M.",
""
]
] | Charmless B->PP decays are studied using flavor SU(3) symmetry. Amplitude with charming penguin topology is considered for two cases: with zero and with arbitrary strong phase. Two sets of data (an older and the most recent one) are used in the fits, so that the stability of the fits is tested. It is shown that within the present uncertainties in the data the parameters of the fit may be significantly modified, especially the gamma angle. The fits indicate the strong phase of the charming penguin amplitude to be around $\pm 20^{o}$. |
2005.12323 | I. V. Danilkin | Victor Ananyev, Igor Danilkin, Marc Vanderhaeghen | Light-by-light scattering sum rule for radiative transitions of
bottomonia | 9 pages, 2 figures | Phys. Rev. D 102, 096019 (2020) | 10.1103/PhysRevD.102.096019 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We generalize a forward light-by-light scattering sum rule to the case of
heavy quarkonium radiative transitions. We apply such sum rule to the
bottomonium states, and use available data on radiative transitions in its
evaluation. For the transitions that are not known experimentally, we provide
theoretical estimates within a potential model, and consider the spread between
similar approaches in the literature as an estimate for the model error. For
the $\Upsilon(1S)$, $\Upsilon(2S)$, and $\Upsilon(3S)$ states we observe that,
due to a cancellation between transitions involving $\chi_{b0}, \chi_{b1}$, and
$\chi_{b2}$ states, the sum rule is satisfied within experimental and
theoretical error estimates. Having tested this sum rule for the low-lying
bottomonium states, it may be used as a tool to investigate the nature of
exotic states in the charmonium and bottomonium spectrum through the
corresponding radiative transitions.
| [
{
"created": "Mon, 25 May 2020 18:17:50 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Nov 2020 20:47:08 GMT",
"version": "v2"
}
] | 2020-11-25 | [
[
"Ananyev",
"Victor",
""
],
[
"Danilkin",
"Igor",
""
],
[
"Vanderhaeghen",
"Marc",
""
]
] | We generalize a forward light-by-light scattering sum rule to the case of heavy quarkonium radiative transitions. We apply such sum rule to the bottomonium states, and use available data on radiative transitions in its evaluation. For the transitions that are not known experimentally, we provide theoretical estimates within a potential model, and consider the spread between similar approaches in the literature as an estimate for the model error. For the $\Upsilon(1S)$, $\Upsilon(2S)$, and $\Upsilon(3S)$ states we observe that, due to a cancellation between transitions involving $\chi_{b0}, \chi_{b1}$, and $\chi_{b2}$ states, the sum rule is satisfied within experimental and theoretical error estimates. Having tested this sum rule for the low-lying bottomonium states, it may be used as a tool to investigate the nature of exotic states in the charmonium and bottomonium spectrum through the corresponding radiative transitions. |
hep-ph/0412170 | Fabian Brau | Fabian Brau | Bohr-Sommerfeld quantization and meson spectroscopy | 13 pages | Phys.Rev. D62 (2000) 014005 | 10.1103/PhysRevD.62.014005 | null | hep-ph | null | We use the Bohr-Sommerfeld quantization approach in the context of
constituent quark models. This method provides, for the Cornell potential,
analytical formulae for the energy spectra which closely approximate numerical
exact calculations performed with the Schrodinger or the spinless Salpeter
equations. The Bohr-Sommerfeld quantization procedure can also be used to
calculate other observables such as r.m.s. radius or wave function at the
origin. Asymptotic dependence of these observables on quantum numbers are also
obtained in the case of potentials which behave asymptotically as a power-law.
We discuss the constraints imposed by these formulae on the dynamics of the
quark-antiquark interaction.
| [
{
"created": "Tue, 14 Dec 2004 12:20:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Brau",
"Fabian",
""
]
] | We use the Bohr-Sommerfeld quantization approach in the context of constituent quark models. This method provides, for the Cornell potential, analytical formulae for the energy spectra which closely approximate numerical exact calculations performed with the Schrodinger or the spinless Salpeter equations. The Bohr-Sommerfeld quantization procedure can also be used to calculate other observables such as r.m.s. radius or wave function at the origin. Asymptotic dependence of these observables on quantum numbers are also obtained in the case of potentials which behave asymptotically as a power-law. We discuss the constraints imposed by these formulae on the dynamics of the quark-antiquark interaction. |
hep-ph/0402139 | Ivanov Dmitri | D.Yu. Ivanov, G.L. Kotkin, V.G. Serbo | Complete description of polarization effects in emission of a photon by
an electron in the field of a strong laser wave | 18 pages, minor changes, published version | Eur.Phys.J.C36:127-145,2004 | 10.1140/epjc/s2004-01892-3 | null | hep-ph nucl-ex physics.atom-ph | null | We consider emission of a photon by an electron in the field of a strong
laser wave. Polarization effects in this process are important for a number of
physical problems. A probability of this process for circularly or linearly
polarized laser photons and for arbitrary polarization of all other particles
is calculated. We obtain the complete set of functions which describe such a
probability in a compact invariant form. Besides, we discuss in some detail the
polarization effects in the kinematics relevant to the problem of electron to
photon conversion at photon-photon and photon-electron colliders.
| [
{
"created": "Fri, 13 Feb 2004 09:25:55 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Jul 2004 11:59:39 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Jul 2004 04:52:53 GMT",
"version": "v3"
},
{
"created": "Wed, 10 Nov 2004 19:44:52 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Ivanov",
"D. Yu.",
""
],
[
"Kotkin",
"G. L.",
""
],
[
"Serbo",
"V. G.",
""
]
] | We consider emission of a photon by an electron in the field of a strong laser wave. Polarization effects in this process are important for a number of physical problems. A probability of this process for circularly or linearly polarized laser photons and for arbitrary polarization of all other particles is calculated. We obtain the complete set of functions which describe such a probability in a compact invariant form. Besides, we discuss in some detail the polarization effects in the kinematics relevant to the problem of electron to photon conversion at photon-photon and photon-electron colliders. |
2102.07984 | Sheng-Tao Li | Sheng-Tao Li, Gang L\"u | Hunting for direct CP violation in $\bar{B}_s^0 \to
{\pi^+}{\pi^-}K^{*0}$ | null | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In perturbative QCD approach, based on the first order of isospin symmetry
breaking, we study the direct $CP$ violation in the decay of
$\bar{B}_s^0\to\rho(\omega )K^{*0}\to {\pi^+}{\pi^-}K^{*0}$. An interesting
mechanism is applied to enlarge the $CP$ violating asymmetry involving the
charge symmetry breaking between $\rho$ and $\omega$. We find that the $CP$
violation is large by the $\rho-\omega$ mixing mechanism when the invariant
masses of the $\pi^+\pi^-$ pairs is in the vicinity of the $\omega$ resonance.
For the decay process of $\bar{B}^0_{s}\to\rho(\omega
)K^{*0}\to{\pi^+}{\pi^-}K^{*0}$, the maximum $CP$ violation can reach
$-59.12\%$. Furthermore, taking $\rho-\omega$ mixing into account, we calculate
the branching ratio for $\bar{B}_s^0 \rightarrow \rho(\omega) K^{*0}$. We also
discuss the possibility of observing the predicted $CP$ violation asymmetry at
the LHC.
| [
{
"created": "Tue, 16 Feb 2021 07:14:50 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Oct 2021 11:47:39 GMT",
"version": "v2"
}
] | 2021-10-26 | [
[
"Li",
"Sheng-Tao",
""
],
[
"Lü",
"Gang",
""
]
] | In perturbative QCD approach, based on the first order of isospin symmetry breaking, we study the direct $CP$ violation in the decay of $\bar{B}_s^0\to\rho(\omega )K^{*0}\to {\pi^+}{\pi^-}K^{*0}$. An interesting mechanism is applied to enlarge the $CP$ violating asymmetry involving the charge symmetry breaking between $\rho$ and $\omega$. We find that the $CP$ violation is large by the $\rho-\omega$ mixing mechanism when the invariant masses of the $\pi^+\pi^-$ pairs is in the vicinity of the $\omega$ resonance. For the decay process of $\bar{B}^0_{s}\to\rho(\omega )K^{*0}\to{\pi^+}{\pi^-}K^{*0}$, the maximum $CP$ violation can reach $-59.12\%$. Furthermore, taking $\rho-\omega$ mixing into account, we calculate the branching ratio for $\bar{B}_s^0 \rightarrow \rho(\omega) K^{*0}$. We also discuss the possibility of observing the predicted $CP$ violation asymmetry at the LHC. |
hep-ph/0308216 | Kalmykov Mikhail | F.Jegerlehner, M.Yu.Kalmykov | O(\alpha \alpha_s) correction to the pole mass of the t-quark within the
Standard Model | 23 pages, LaTeX, 5-eps figures; In v.2 the typos in Eqs.(4.41),
(5.54), (5.56), (5.57) and Fifure 4 corrected. New references are added | Nucl.Phys.B676:365-389,2004 | 10.1016/j.nuclphysb.2003.10.012 | DESY 03-11; SFB/CPP-03-1 | hep-ph | null | We have calculated the O(\alpha \alpha_s) contributions to the relationship
between the MS-mass and the pole of the t-quark propagator in the Standard
Model in the limit of a diagonal CKM matrix and for a massless b-quark.
Analytical results for the so far unknown master-integrals appearing in the
calculation are also given.
| [
{
"created": "Thu, 21 Aug 2003 08:16:24 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Oct 2003 15:54:18 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Jegerlehner",
"F.",
""
],
[
"Kalmykov",
"M. Yu.",
""
]
] | We have calculated the O(\alpha \alpha_s) contributions to the relationship between the MS-mass and the pole of the t-quark propagator in the Standard Model in the limit of a diagonal CKM matrix and for a massless b-quark. Analytical results for the so far unknown master-integrals appearing in the calculation are also given. |
1504.07841 | Gennady Lykasov I | D.A. Artemenkov, G.I. Lykasov, A.I. Malakhov | Self-similarity of hadron production in p-p and A-A collisions at high
energies | 13 pages, 7 figures | null | 10.1142/S0217751X15501274 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the self-similarity approach applied to study the hadron
production in p-p and A-A collisions. This approach allows us to describe
rather well the ratio of the proton to anti-proton yields in A-A collisions as
a function of the energy at a wide range from a few GeV to a few TeV. We
suggest a modification of this approach to describe rather well the inclusive
spectra of hadrons produced in $pp$ collisions at different initial energies
from the AGS to LHC.
| [
{
"created": "Wed, 29 Apr 2015 12:56:08 GMT",
"version": "v1"
}
] | 2015-10-28 | [
[
"Artemenkov",
"D. A.",
""
],
[
"Lykasov",
"G. I.",
""
],
[
"Malakhov",
"A. I.",
""
]
] | We analyze the self-similarity approach applied to study the hadron production in p-p and A-A collisions. This approach allows us to describe rather well the ratio of the proton to anti-proton yields in A-A collisions as a function of the energy at a wide range from a few GeV to a few TeV. We suggest a modification of this approach to describe rather well the inclusive spectra of hadrons produced in $pp$ collisions at different initial energies from the AGS to LHC. |
0812.3078 | Viktor Begun | V. V. Begun, M. Ga\'zdzicki, M. I. Gorenstein | Semi-Inclusive Distributions in Statistical Models | Two subsections are added: "Average multiplicities, fluctuations and
correlations" and "Quantum statistics" | Phys.Rev.C80:064903,2009 | 10.1103/PhysRevC.80.064903 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The semi-inclusive properties of the system of neutral and charged particles
with net charge equal to zero are considered in the grand canonical, canonical
and micro-canonical ensembles as well as in micro-canonical ensemble with
scaling volume fluctuations. Distributions of neutral particle multiplicity and
charged particle momentum are calculated as a function of the number of charged
particles. Different statistical ensembles lead to qualitatively different
dependencies. They are being compared with the corresponding experimental data
on multi-hadron production in $p+p$ interactions at high energies.
| [
{
"created": "Tue, 16 Dec 2008 14:46:31 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Oct 2009 20:06:56 GMT",
"version": "v2"
}
] | 2010-04-15 | [
[
"Begun",
"V. V.",
""
],
[
"Gaździcki",
"M.",
""
],
[
"Gorenstein",
"M. I.",
""
]
] | The semi-inclusive properties of the system of neutral and charged particles with net charge equal to zero are considered in the grand canonical, canonical and micro-canonical ensembles as well as in micro-canonical ensemble with scaling volume fluctuations. Distributions of neutral particle multiplicity and charged particle momentum are calculated as a function of the number of charged particles. Different statistical ensembles lead to qualitatively different dependencies. They are being compared with the corresponding experimental data on multi-hadron production in $p+p$ interactions at high energies. |
2203.05939 | David d'Enterria | David d'Enterria, Marco Drewes, Andrea Giammanco, Jan Hajer, Elena
Bratkovskaya, Roderik Bruce, Nazar Burmasov, Mateusz Dyndal, Oliver Gould,
Iwona Grabowska-Bold, Malgorzata Gumberidze, Taku Gunji, Romain Holzmann,
John M. Jowett, Evgeny Kryshen, Vitalii A. Okorokov, Ida Schmidt, Aditya
Upreti | Opportunities for new physics searches with heavy ions at colliders | 26 pages, 5 figures. White paper of the Proceedings of the US
Community Study on the Future of Particle Physics (Snowmass 2021) | J. Phys. G: Nucl. Part. Phys. 50 (2023) 050501 | 10.1088/1361-6471/acc197 | null | hep-ph hep-ex nucl-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | Opportunities for searches for phenomena beyond the Standard Model (BSM)
using heavy-ions beams at high energies are outlined. Different BSM searches
proposed in the last years in collisions of heavy ions, mostly at the Large
Hadron Collider, are summarized. A few concrete selected cases are reviewed
including searches for axion-like particles, anomalous $\tau$ electromagnetic
moments, magnetic monopoles, and dark photons. Expectations for the achievable
sensitivities of these searches in the coming years are given. Studies of CP
violation in hot and dense QCD matter and connections to ultrahigh-energy
cosmic rays physics are also mentioned.
| [
{
"created": "Fri, 11 Mar 2022 14:16:43 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Apr 2023 13:44:31 GMT",
"version": "v2"
}
] | 2023-04-17 | [
[
"d'Enterria",
"David",
""
],
[
"Drewes",
"Marco",
""
],
[
"Giammanco",
"Andrea",
""
],
[
"Hajer",
"Jan",
""
],
[
"Bratkovskaya",
"Elena",
""
],
[
"Bruce",
"Roderik",
""
],
[
"Burmasov",
"Nazar",
""
],
[
"Dyndal",
"Mateusz",
""
],
[
"Gould",
"Oliver",
""
],
[
"Grabowska-Bold",
"Iwona",
""
],
[
"Gumberidze",
"Malgorzata",
""
],
[
"Gunji",
"Taku",
""
],
[
"Holzmann",
"Romain",
""
],
[
"Jowett",
"John M.",
""
],
[
"Kryshen",
"Evgeny",
""
],
[
"Okorokov",
"Vitalii A.",
""
],
[
"Schmidt",
"Ida",
""
],
[
"Upreti",
"Aditya",
""
]
] | Opportunities for searches for phenomena beyond the Standard Model (BSM) using heavy-ions beams at high energies are outlined. Different BSM searches proposed in the last years in collisions of heavy ions, mostly at the Large Hadron Collider, are summarized. A few concrete selected cases are reviewed including searches for axion-like particles, anomalous $\tau$ electromagnetic moments, magnetic monopoles, and dark photons. Expectations for the achievable sensitivities of these searches in the coming years are given. Studies of CP violation in hot and dense QCD matter and connections to ultrahigh-energy cosmic rays physics are also mentioned. |
1802.08531 | Simon Platzer | Ren\'e \'Angeles Mart\'inez, Matthew De Angelis, Jeffrey R. Forshaw,
Simon Pl\"atzer, Michael H. Seymour | Soft gluon evolution and non-global logarithms | 34 pages, 6 figures | null | null | MAN/HEP/2018/001, CERN-TH-2018-037, IFJPAN-IV-2018-4, UWTHPH-2018-3,
MCnet-18-03 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider soft-gluon evolution at the amplitude level. Our evolution
includes Coulomb exchanges and applies to generic hard-scattering processes
involving any number of coloured partons. We emphasise the special role played
by a Lorentz-invariant evolution variable, which coincides with the transverse
momentum of the latest emission in a suitably defined dipole zero-momentum
frame. We also relate the evolution algorithm, which was used originally in the
derivation of super-leading logarithms, to renormalization group evolution
equations that have been encountered recently. Handling large colour matrices
presents the most significant challenge to numerical implementations and we
present a means to expand systematically about the leading colour
approximation.
| [
{
"created": "Fri, 23 Feb 2018 13:54:37 GMT",
"version": "v1"
}
] | 2018-02-26 | [
[
"Martínez",
"René Ángeles",
""
],
[
"De Angelis",
"Matthew",
""
],
[
"Forshaw",
"Jeffrey R.",
""
],
[
"Plätzer",
"Simon",
""
],
[
"Seymour",
"Michael H.",
""
]
] | We consider soft-gluon evolution at the amplitude level. Our evolution includes Coulomb exchanges and applies to generic hard-scattering processes involving any number of coloured partons. We emphasise the special role played by a Lorentz-invariant evolution variable, which coincides with the transverse momentum of the latest emission in a suitably defined dipole zero-momentum frame. We also relate the evolution algorithm, which was used originally in the derivation of super-leading logarithms, to renormalization group evolution equations that have been encountered recently. Handling large colour matrices presents the most significant challenge to numerical implementations and we present a means to expand systematically about the leading colour approximation. |
1703.05327 | Jos\'e Francisco Zurita | Rakhi Mahbubani, Pedro Schwaller, Jose Zurita | Closing the window for compressed Dark Sectors with disappearing charged
tracks | 20 pages, 11 figures | null | 10.1007/JHEP06(2017)119 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the sensitivity at current and future hadron colliders to a
heavy electrically-charged particle with a proper decay length below a
centimetre, whose decay products are invisible due to below-threshold energies
and/or small couplings to the Standard Model. A cosmologically-motivated
example of a framework that contains such a particle is the Minimal
Supersymmetric Standard Model in the limit of pure Higgsinos. The current
hadron-collider search strategy has no sensitivity to the upper range of pure
Higgsino masses that are consistent with the thermal relic density, even at a
future collider with 100 TeV centre-of-mass energy. We show that performing a
disappearing track search within the inner 10 cm of detector volume would
improve the reach in lifetime by a factor of 3 at the 14 TeV LHC and a further
factor of 5 at a 100 TeV collider, resulting in around 10 events for 1.1 TeV
thermal Higgsinos. In order to include the particles with the largest boost in
the analysis, we furthermore propose a purely track-based search in both the
central and forward regions, each of which would increase the number of events
by another factor of 5, improving our reach at small lifetimes. This would
allow us to definitively discover or exclude the experimentally-elusive
pure-Higgsino thermal relic at a 100 TeV collider.
| [
{
"created": "Wed, 15 Mar 2017 18:00:01 GMT",
"version": "v1"
}
] | 2017-08-02 | [
[
"Mahbubani",
"Rakhi",
""
],
[
"Schwaller",
"Pedro",
""
],
[
"Zurita",
"Jose",
""
]
] | We investigate the sensitivity at current and future hadron colliders to a heavy electrically-charged particle with a proper decay length below a centimetre, whose decay products are invisible due to below-threshold energies and/or small couplings to the Standard Model. A cosmologically-motivated example of a framework that contains such a particle is the Minimal Supersymmetric Standard Model in the limit of pure Higgsinos. The current hadron-collider search strategy has no sensitivity to the upper range of pure Higgsino masses that are consistent with the thermal relic density, even at a future collider with 100 TeV centre-of-mass energy. We show that performing a disappearing track search within the inner 10 cm of detector volume would improve the reach in lifetime by a factor of 3 at the 14 TeV LHC and a further factor of 5 at a 100 TeV collider, resulting in around 10 events for 1.1 TeV thermal Higgsinos. In order to include the particles with the largest boost in the analysis, we furthermore propose a purely track-based search in both the central and forward regions, each of which would increase the number of events by another factor of 5, improving our reach at small lifetimes. This would allow us to definitively discover or exclude the experimentally-elusive pure-Higgsino thermal relic at a 100 TeV collider. |
1907.03131 | Stanislaw Mrowczynski | Margaret E. Carrington and Stanislaw Mrowczynski | Effective Coupling Constant of Plasmons | 18 pages, minor corrections, to appear in Phys. Rev. D | Phys. Rev. D 100, 056020 (2019) | 10.1103/PhysRevD.100.056020 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study an ultrarelativistic QED plasma in thermal equilibrium. Plasmons -
photon collective excitations - are postulated to correspond not to poles of
the retarded photon propagator but to poles of the propagator multiplied by the
fine structure constant. This product is an invariant of the renormalization
group that is independent of an arbitrarily chosen renormalization scale. In
addition, our proposal is physically motivated since one needs to scatter a
charged particle off a plasma system to probe its spectrum of collective
excitations. We present a detailed calculation of the QED running coupling
constant at finite temperature using the Keldysh-Schwinger representation of
the real-time formalism. We discuss the issue of how to choose the
renormalization scale and show that the temperature is a natural choice which
prevents the breakdown of perturbation theory through the generation of
potentially large logarithmic terms. Our method could be applied to anisotropic
systems where the choice of the renormalization scale is less clear, and could
have important consequences for the study of collective modes.
| [
{
"created": "Sat, 6 Jul 2019 14:29:10 GMT",
"version": "v1"
},
{
"created": "Sat, 13 Jul 2019 12:15:12 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Aug 2019 18:53:28 GMT",
"version": "v3"
}
] | 2019-10-02 | [
[
"Carrington",
"Margaret E.",
""
],
[
"Mrowczynski",
"Stanislaw",
""
]
] | We study an ultrarelativistic QED plasma in thermal equilibrium. Plasmons - photon collective excitations - are postulated to correspond not to poles of the retarded photon propagator but to poles of the propagator multiplied by the fine structure constant. This product is an invariant of the renormalization group that is independent of an arbitrarily chosen renormalization scale. In addition, our proposal is physically motivated since one needs to scatter a charged particle off a plasma system to probe its spectrum of collective excitations. We present a detailed calculation of the QED running coupling constant at finite temperature using the Keldysh-Schwinger representation of the real-time formalism. We discuss the issue of how to choose the renormalization scale and show that the temperature is a natural choice which prevents the breakdown of perturbation theory through the generation of potentially large logarithmic terms. Our method could be applied to anisotropic systems where the choice of the renormalization scale is less clear, and could have important consequences for the study of collective modes. |
hep-ph/0111340 | Stanley J. Brodsky | Stanley J. Brodsky | QCD Phenomenology and Light-Front Wavefunctions | Invited lectures, presented at the Cracow School Of Theoretical
Physics: 41st Course: Fundamental Interactions, Zakopane, Poland, 2-11 June
2001 | Acta Phys.Polon.B32:4013-4068,2001 | null | SLAC-PUB-9056 | hep-ph | null | A natural calculus for describing the bound-state structure of relativistic
composite systems in quantum field theory is the light-front Fock expansion
which encodes the properties of a hadrons in terms of a set of
frame-independent n-particle wavefunctions. Light-front quantization in the
doubly-transverse light-cone gauge has a number of remarkable advantages,
including explicit unitarity, a physical Fock expansion, the absence of ghost
degrees of freedom, and the decoupling properties needed to prove factorization
theorems in high momentum transfer inclusive and exclusive reactions. A number
of applications are discussed in these lectures, including semileptonic B-meson
decays, two-photon exclusive reactions, diffractive dissociation into jets, and
deeply virtual Compton scattering. The relation of the intrinsic sea to the
light-front wavefunctions is discussed. Light-front quantization can also be
used in the Hamiltonian form to construct an event generator for high energy
physics reactions at the amplitude level. The light-cone partition function,
summed over exponentially-weighted light-cone energies, has simple boost
properties which may be useful for studies in heavy ion collisions. I also
review recent work which shows that the structure functions measured in deep
inelastic lepton scattering are affected by final-state rescattering, thus
modifying their connection to light-front probability distributions. In
particular, the shadowing of nuclear structure functions is due to destructive
interference effects from leading-twist diffraction of the virtual photon,
physics not included in the nuclear light-cone wavefunctions.
| [
{
"created": "Tue, 27 Nov 2001 08:43:52 GMT",
"version": "v1"
}
] | 2009-09-11 | [
[
"Brodsky",
"Stanley J.",
""
]
] | A natural calculus for describing the bound-state structure of relativistic composite systems in quantum field theory is the light-front Fock expansion which encodes the properties of a hadrons in terms of a set of frame-independent n-particle wavefunctions. Light-front quantization in the doubly-transverse light-cone gauge has a number of remarkable advantages, including explicit unitarity, a physical Fock expansion, the absence of ghost degrees of freedom, and the decoupling properties needed to prove factorization theorems in high momentum transfer inclusive and exclusive reactions. A number of applications are discussed in these lectures, including semileptonic B-meson decays, two-photon exclusive reactions, diffractive dissociation into jets, and deeply virtual Compton scattering. The relation of the intrinsic sea to the light-front wavefunctions is discussed. Light-front quantization can also be used in the Hamiltonian form to construct an event generator for high energy physics reactions at the amplitude level. The light-cone partition function, summed over exponentially-weighted light-cone energies, has simple boost properties which may be useful for studies in heavy ion collisions. I also review recent work which shows that the structure functions measured in deep inelastic lepton scattering are affected by final-state rescattering, thus modifying their connection to light-front probability distributions. In particular, the shadowing of nuclear structure functions is due to destructive interference effects from leading-twist diffraction of the virtual photon, physics not included in the nuclear light-cone wavefunctions. |
hep-ph/9701369 | Baurov Alexey Yuryevich | Yu.A. Baurov (Central Scientific Research Institute of Machinery,
Moscow) and A.V. Kopajev (Sternberg State Astronomical Institute, Moscow) | Experimental Investigations of New Interaction by Use of Stationary
High-accuracy Quartz Gravimeter | 11 pages, latex, 6 ps figures, Submit to Ph. Rev. D15 | null | null | null | hep-ph astro-ph gr-qc | null | Smooth anomalous in time dependence recordings of a high accuracy quartz
gravimeter with a constant magnet attached to it, were revealed. These
anomalies of minute's duration have amplitudes sometimes by more than an order
of magnitude greater than that of the Moon tide, and may not be explained with
the aid of current physical concepts. The experimental procedure was based on
the hypothesis of a new interaction arising when acting on physical vacuum by
magnetic systems through their vectorial potential. The coordinates of physical
space magnetic anisotropy due to existence of the cosmological vector potential
$A_g$, a new basic vectorial constant, are determined. In particular, the
declination coordinate $\delta\approx 34^\circ$ of the vector $A_g$ (second
equatorial coordinate system) is determined for the first time by experiment.
The hypothesis considered was used for physical justification of the results
obtained.
| [
{
"created": "Fri, 24 Jan 1997 16:27:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Baurov",
"Yu. A.",
"",
"Central Scientific Research Institute of Machinery,\n Moscow"
],
[
"Kopajev",
"A. V.",
"",
"Sternberg State Astronomical Institute, Moscow"
]
] | Smooth anomalous in time dependence recordings of a high accuracy quartz gravimeter with a constant magnet attached to it, were revealed. These anomalies of minute's duration have amplitudes sometimes by more than an order of magnitude greater than that of the Moon tide, and may not be explained with the aid of current physical concepts. The experimental procedure was based on the hypothesis of a new interaction arising when acting on physical vacuum by magnetic systems through their vectorial potential. The coordinates of physical space magnetic anisotropy due to existence of the cosmological vector potential $A_g$, a new basic vectorial constant, are determined. In particular, the declination coordinate $\delta\approx 34^\circ$ of the vector $A_g$ (second equatorial coordinate system) is determined for the first time by experiment. The hypothesis considered was used for physical justification of the results obtained. |
1606.02684 | Leonard S. Kisslinger | Leonard S. Kisslinger | Neutrino Oscillations With Two Sterile Neutrinos | 8pages,2 figures,uses newly measured sterile-active neutrino mixing
angle | null | 10.1007/s10773-016-3069-9 | IJTP-D-16-00225R1 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work estimates the probability of $\mu$ to $e$ neutrino oscillation with
two sterile neutrinos using a 5x5 U-matrix, an extension of the previous
estimate with one sterile neutrino and a 4x4 U-matrix. The sterile
neutrino-active neutrino mass differences and the mixing angles of the two
sterile neutrinos with the three active neutrinos are taken from recent
publications, and the oscillation probability for one sterile neutrino is
compared to the previous estimate.
| [
{
"created": "Thu, 19 May 2016 16:33:44 GMT",
"version": "v1"
}
] | 2016-06-29 | [
[
"Kisslinger",
"Leonard S.",
""
]
] | This work estimates the probability of $\mu$ to $e$ neutrino oscillation with two sterile neutrinos using a 5x5 U-matrix, an extension of the previous estimate with one sterile neutrino and a 4x4 U-matrix. The sterile neutrino-active neutrino mass differences and the mixing angles of the two sterile neutrinos with the three active neutrinos are taken from recent publications, and the oscillation probability for one sterile neutrino is compared to the previous estimate. |
2112.13857 | Casey Cartwright | Casey Cartwright, Matthias Kaminski, Bjoern Schenke | Energy dependence of the chiral magnetic effect in expanding holographic
plasma | 18 pages, 6 figures, comments welcome | null | 10.1103/PhysRevC.105.034903 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on a holographic far-from-equilibrium calculation of the chiral
magnetic effect~(CME) in an expanding quark gluon plasma, we study collisions
at various energies. We compute the time evolution of the CME current in the
presence of a time-dependent axial charge density and subject to a
time-dependent magnetic field. The plasma expansion leads to a dilution of the
CME current. We study distinct combinations of how the initial magnetic field
and initial axial charge behave with changing initial energy as proposed in
previous literature. Most scenarios we consider lead to an increasing
time-integrated CME current, when increasing the initial energy. This would
make it more likely to observe the CME at higher collision energies.
| [
{
"created": "Mon, 27 Dec 2021 19:00:04 GMT",
"version": "v1"
}
] | 2022-03-23 | [
[
"Cartwright",
"Casey",
""
],
[
"Kaminski",
"Matthias",
""
],
[
"Schenke",
"Bjoern",
""
]
] | Based on a holographic far-from-equilibrium calculation of the chiral magnetic effect~(CME) in an expanding quark gluon plasma, we study collisions at various energies. We compute the time evolution of the CME current in the presence of a time-dependent axial charge density and subject to a time-dependent magnetic field. The plasma expansion leads to a dilution of the CME current. We study distinct combinations of how the initial magnetic field and initial axial charge behave with changing initial energy as proposed in previous literature. Most scenarios we consider lead to an increasing time-integrated CME current, when increasing the initial energy. This would make it more likely to observe the CME at higher collision energies. |
1902.02944 | Hyun-Chul Kim | Hyun-Chul Kim | Structure of heavy baryons in a pion mean-field approach | 4 pages, No figure. Contribution to the proceedings of "8th
International Conference on Quarks and Nuclear Physics (QNP2018)", November
13-17, 2018, Tsukuba, Japan | null | 10.7566/JPSCP.26.022025 | INHA-NTG-05/2019 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk, we briefly review a series of recent works on singly heavy
baryons, based on a pion mean-field approach. In the limit of the infinitely
heavy quark mass, heavy baryons are governed mainly by the light degress of
freedom. Taking the number of colors to be infinity, a heavy baryon arises as a
state consisting of $N_c-1$ valence quarks bound by the pion mean fields
created self-consistently. Within this framework, we present the results of the
mass spectra of the charmed and bottom baryons, and their magnetic moments. The
behavior of the electromagnetic form factors will be also mentioned.
| [
{
"created": "Fri, 8 Feb 2019 05:55:48 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Kim",
"Hyun-Chul",
""
]
] | In this talk, we briefly review a series of recent works on singly heavy baryons, based on a pion mean-field approach. In the limit of the infinitely heavy quark mass, heavy baryons are governed mainly by the light degress of freedom. Taking the number of colors to be infinity, a heavy baryon arises as a state consisting of $N_c-1$ valence quarks bound by the pion mean fields created self-consistently. Within this framework, we present the results of the mass spectra of the charmed and bottom baryons, and their magnetic moments. The behavior of the electromagnetic form factors will be also mentioned. |
hep-ph/9404258 | Zhangzx | Ma Wen-Gan, Sun La-Zhen, Liu Yao-Yang, Jiang Yi and Chao-Hsi Chang | The forward-backward asymmetry with $Z'$ effects in the process $e^{+}$
$e^{-}$ $\rightarrow$ $\mu^{+}$ $\mu^{-}$ | 10, AS-ITP-94-11 | J.Phys. G20 (1994) 1391-1398 | 10.1088/0954-3899/20/9/008 | null | hep-ph | null | Having taken the QED radiative correction and one-loop weak corrections into
account, we have computed the unpolarized forward-backward asymmetry in the
process $e^+e^- -> \mu^+\mu^-$ at a very reasonable accuracy. Special attention
to the effects around the LEP 200 energy, induced by the possible $Z'$ boson of
the left-right symmetric model $SU(2)_{L} \times SU(2)_{R} \times U(1)_{B-L}$,
is paid. The numerical results of the directly measurable asymmetry
$A_{FB}^{\mu}$ versus the CMS energies are presented in figures. One may be
convinced by the results that precise measurements on the asymmetry in future
colliders will possibly present some indirectly evidence of the $Z'$ boson.
| [
{
"created": "Tue, 12 Apr 1994 22:32:08 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Wen-Gan",
"Ma",
""
],
[
"La-Zhen",
"Sun",
""
],
[
"Yao-Yang",
"Liu",
""
],
[
"Yi",
"Jiang",
""
],
[
"Chang",
"Chao-Hsi",
""
]
] | Having taken the QED radiative correction and one-loop weak corrections into account, we have computed the unpolarized forward-backward asymmetry in the process $e^+e^- -> \mu^+\mu^-$ at a very reasonable accuracy. Special attention to the effects around the LEP 200 energy, induced by the possible $Z'$ boson of the left-right symmetric model $SU(2)_{L} \times SU(2)_{R} \times U(1)_{B-L}$, is paid. The numerical results of the directly measurable asymmetry $A_{FB}^{\mu}$ versus the CMS energies are presented in figures. One may be convinced by the results that precise measurements on the asymmetry in future colliders will possibly present some indirectly evidence of the $Z'$ boson. |
2307.00803 | Zhongyu Wang | Zhong-Yu Wang and Zhi-Feng Sun | The hidden strange $B_{c}$-like molecular states | 15 pages, 8 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With the chiral unitary approach, we evaluate the hidden strange $B_{c}$-like
molecular states of $b\bar{c}s\bar{s}$ systems $\bar{B}_{s}\bar{D}_{s}$,
$\bar{B}_{s}^{*}\bar{D}_{s}$, $\bar{B}_{s}\bar{D}_{s}^{*}$, and
$\bar{B}_{s}^{*}\bar{D}_{s}^{*}$ coupled to the non-strange channels. The
$S$-wave scattering amplitudes are calculated based on the vector meson
exchange, four pseudoscalar mesons contact interactions, and four vector mesons
contact interactions obtained from the extended local hidden gauge approach. We
find six states below the threshold of the most relevant channel. The binding
energies of these states are around $1-10$ MeV and the widths are around
$0.2-0.7$ MeV. Our research is a supplement to the mass spectra of $B_{c}$-like
states, which may be useful for the experimental search in the future.
| [
{
"created": "Mon, 3 Jul 2023 07:38:21 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Jul 2023 08:30:39 GMT",
"version": "v2"
}
] | 2023-07-11 | [
[
"Wang",
"Zhong-Yu",
""
],
[
"Sun",
"Zhi-Feng",
""
]
] | With the chiral unitary approach, we evaluate the hidden strange $B_{c}$-like molecular states of $b\bar{c}s\bar{s}$ systems $\bar{B}_{s}\bar{D}_{s}$, $\bar{B}_{s}^{*}\bar{D}_{s}$, $\bar{B}_{s}\bar{D}_{s}^{*}$, and $\bar{B}_{s}^{*}\bar{D}_{s}^{*}$ coupled to the non-strange channels. The $S$-wave scattering amplitudes are calculated based on the vector meson exchange, four pseudoscalar mesons contact interactions, and four vector mesons contact interactions obtained from the extended local hidden gauge approach. We find six states below the threshold of the most relevant channel. The binding energies of these states are around $1-10$ MeV and the widths are around $0.2-0.7$ MeV. Our research is a supplement to the mass spectra of $B_{c}$-like states, which may be useful for the experimental search in the future. |
hep-ph/0206207 | Tetsuo Shindou | Takahiro Miura, Tetsuo Shindou and Eiichi Takasugi | Exploring the neutrino mass matrix at M_R scale | revtex4, 20 pages, 6 figures | Phys.Rev. D66 (2002) 093002 | 10.1103/PhysRevD.66.093002 | OU-HET 414 | hep-ph | null | We discuss the neutrino mass matrix which predicts zero or small values of
|V_{13}| in MSSM and found the inequality, sin^2 2theta_{12} <= sin^2
2theta_sol, where sin^2 2theta_{12} is the mixing angle at M_R scale and sin^2
2theta_{sol} is the value determined by the solar neutrino oscillation. This
constraint says that the model which predicts a larger value of tan^2
theta_{sol} at M_R than the experimental value is excluded. In particular, the
bi-maximal mixing scheme at M_R scale is excluded, from the experimental value
tan^2 theta_sol<1. In this model, |V_{13}| and a Dirac phase at m_Z are induced
radiatively and turn out to be not small. The effective neutrino mass <m_nu> is
expected to be of order 0.05 eV.
| [
{
"created": "Fri, 21 Jun 2002 12:14:49 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Jul 2002 13:10:30 GMT",
"version": "v2"
},
{
"created": "Sat, 20 Jul 2002 06:11:07 GMT",
"version": "v3"
},
{
"created": "Tue, 10 Sep 2002 08:29:00 GMT",
"version": "v4"
}
] | 2009-11-07 | [
[
"Miura",
"Takahiro",
""
],
[
"Shindou",
"Tetsuo",
""
],
[
"Takasugi",
"Eiichi",
""
]
] | We discuss the neutrino mass matrix which predicts zero or small values of |V_{13}| in MSSM and found the inequality, sin^2 2theta_{12} <= sin^2 2theta_sol, where sin^2 2theta_{12} is the mixing angle at M_R scale and sin^2 2theta_{sol} is the value determined by the solar neutrino oscillation. This constraint says that the model which predicts a larger value of tan^2 theta_{sol} at M_R than the experimental value is excluded. In particular, the bi-maximal mixing scheme at M_R scale is excluded, from the experimental value tan^2 theta_sol<1. In this model, |V_{13}| and a Dirac phase at m_Z are induced radiatively and turn out to be not small. The effective neutrino mass <m_nu> is expected to be of order 0.05 eV. |
1405.7177 | Vesna Borka Jovanovi\'c | V. Borka Jovanovi\'c, D. Borka, P. Jovanovi\'c, J. Milo\v{s}evi\'c, S.
R. Ignjatovi\'c | Masses of constituent quarks confined in open bottom hadrons | 15 pages, 6 tables, 1 figure. Accepted for publication in Mod. Phys.
Lett. A | null | 10.1142/S0217732314502022 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply color-spin and flavor-spin quark-quark interactions to the meson and
baryon constituent quarks, and calculate constituent quark masses, as well as
the coupling constants of these interactions. The main goal of this paper was
to determine constituent quark masses from light and open bottom hadron masses,
using the fitting method we have developed and clustering of hadron groups. We
use color-spin Fermi-Breit (FB) and flavor-spin Glozman-Riska (GR) hyperfine
interaction (HFI) to determine constituent quark masses (especially $b$ quark
mass). Another aim was to discern between the FB and GR HFI because our
previous findings had indicated that both interactions were satisfactory. Our
improved fitting procedure of constituent quark masses showed that on average
color-spin (Fermi-Breit) hyperfine interaction yields better fits. The method
also shows the way how the constituent quark masses and the strength of the
interaction constants appear in different hadron environments.
| [
{
"created": "Wed, 28 May 2014 10:02:49 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Oct 2014 08:30:45 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Dec 2014 09:33:43 GMT",
"version": "v3"
}
] | 2014-12-04 | [
[
"Jovanović",
"V. Borka",
""
],
[
"Borka",
"D.",
""
],
[
"Jovanović",
"P.",
""
],
[
"Milošević",
"J.",
""
],
[
"Ignjatović",
"S. R.",
""
]
] | We apply color-spin and flavor-spin quark-quark interactions to the meson and baryon constituent quarks, and calculate constituent quark masses, as well as the coupling constants of these interactions. The main goal of this paper was to determine constituent quark masses from light and open bottom hadron masses, using the fitting method we have developed and clustering of hadron groups. We use color-spin Fermi-Breit (FB) and flavor-spin Glozman-Riska (GR) hyperfine interaction (HFI) to determine constituent quark masses (especially $b$ quark mass). Another aim was to discern between the FB and GR HFI because our previous findings had indicated that both interactions were satisfactory. Our improved fitting procedure of constituent quark masses showed that on average color-spin (Fermi-Breit) hyperfine interaction yields better fits. The method also shows the way how the constituent quark masses and the strength of the interaction constants appear in different hadron environments. |
hep-ph/9702326 | Lubov Vassilevskaya | N.V. Mikheev and L.A. Vassilevskaya | Axion decay $a \to f \tilde f$ in a strong magnetic field | 6 pages, latex. Amended version, references added, to be published in
Phys.Lett.B | Phys.Lett. B410 (1997) 203-206 | 10.1016/S0370-2693(97)00876-9 | YARU-HE-97/03 | hep-ph | null | The axion decay into charged fermion-antifermion pair $a ~\to f ~\tilde f$ is
studied in external crossed and magnetic fields. The result we have obtained
can be of use to re-examine the lower limit on the axion mass in case of
possible existence of strong magnetic fields at the early Universe stage.
| [
{
"created": "Thu, 13 Feb 1997 14:18:51 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Aug 1997 12:12:30 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Mikheev",
"N. V.",
""
],
[
"Vassilevskaya",
"L. A.",
""
]
] | The axion decay into charged fermion-antifermion pair $a ~\to f ~\tilde f$ is studied in external crossed and magnetic fields. The result we have obtained can be of use to re-examine the lower limit on the axion mass in case of possible existence of strong magnetic fields at the early Universe stage. |
1011.3694 | Davide Cadamuro | Davide Cadamuro, Steen Hannestad, Georg Raffelt and Javier Redondo | Cosmological bounds on sub-MeV mass axions | 19 pages, 10 figures | JCAP 1102:003,2011 | 10.1088/1475-7516/2011/02/003 | MPP-2010-148 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Axions with mass greater than 0.7 eV are excluded by cosmological precision
data because they provide too much hot dark matter. While for masses above 20
eV the axion lifetime drops below the age of the universe, we show that the
cosmological exclusion range can be extended from 0.7 eV till 300 keV,
primarily by the cosmic deuterium abundance: axion decays would strongly modify
the baryon-to-photon ratio at BBN relative to the one at CMB decoupling.
Additional arguments include neutrino dilution relative to photons by axion
decays and spectral CMB distortions. Our new cosmological constraints
complement stellar-evolution limits and laboratory bounds.
| [
{
"created": "Tue, 16 Nov 2010 14:00:11 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jan 2011 13:36:06 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Cadamuro",
"Davide",
""
],
[
"Hannestad",
"Steen",
""
],
[
"Raffelt",
"Georg",
""
],
[
"Redondo",
"Javier",
""
]
] | Axions with mass greater than 0.7 eV are excluded by cosmological precision data because they provide too much hot dark matter. While for masses above 20 eV the axion lifetime drops below the age of the universe, we show that the cosmological exclusion range can be extended from 0.7 eV till 300 keV, primarily by the cosmic deuterium abundance: axion decays would strongly modify the baryon-to-photon ratio at BBN relative to the one at CMB decoupling. Additional arguments include neutrino dilution relative to photons by axion decays and spectral CMB distortions. Our new cosmological constraints complement stellar-evolution limits and laboratory bounds. |
hep-ph/9406399 | Yamawaki | Koichi Yamawaki and V.I. Zakharov | Nambu-Jona-Lasinio Model vs QCD | LaTeX, 9 pages, UM-TH-94-20, DPNU-94-23 | null | null | null | hep-ph | null | We argue that the extended Nambu-Jona-Lasinio model which introduces
four-quark interactions to describe hadron physics at low energies can be
confronted with fundamental quantum chromodynamics by means of spectral sum
rules. While there arise rather restrictive bounds on the strength of the
effective four-quark interaction in the vector channel, introduction of the
four-quark interaction in the pseudoscalar channel resolves a long standing
puzzle of the sum rules.
| [
{
"created": "Mon, 27 Jun 1994 05:40:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Yamawaki",
"Koichi",
""
],
[
"Zakharov",
"V. I.",
""
]
] | We argue that the extended Nambu-Jona-Lasinio model which introduces four-quark interactions to describe hadron physics at low energies can be confronted with fundamental quantum chromodynamics by means of spectral sum rules. While there arise rather restrictive bounds on the strength of the effective four-quark interaction in the vector channel, introduction of the four-quark interaction in the pseudoscalar channel resolves a long standing puzzle of the sum rules. |
hep-ph/9909413 | Csaba Boros | C. Boros, J.T. Londergan and A.W. Thomas | On the $\xi$-Distribution of Inclusively Produced Particles in $e^+e^-$
Annihilation | null | Phys.Lett.B473:305-308,2000 | 10.1016/S0370-2693(99)01498-7 | ADP-99-39/T376 and IU/NTC 99-09 | hep-ph | null | We discuss the momentum distributions of inclusively produced particles in
$e^+e^-$ annihilation. We show that the dependence of the position of the
maxima of the $\xi=\ln(1/z)$ spectra on the mass of the produced particles
follows naturally from the general definition of fragmentation functions when
energy-momentum conservation is correctly incorporated.
| [
{
"created": "Fri, 17 Sep 1999 06:21:24 GMT",
"version": "v1"
}
] | 2010-02-17 | [
[
"Boros",
"C.",
""
],
[
"Londergan",
"J. T.",
""
],
[
"Thomas",
"A. W.",
""
]
] | We discuss the momentum distributions of inclusively produced particles in $e^+e^-$ annihilation. We show that the dependence of the position of the maxima of the $\xi=\ln(1/z)$ spectra on the mass of the produced particles follows naturally from the general definition of fragmentation functions when energy-momentum conservation is correctly incorporated. |
hep-ph/9501308 | Nick Evans | Nick Evans | FERMION MASSES IN EXTENDED TECHNICOLOUR | 7 pages, latex, two figures appended | null | null | YCTP-P3-95 | hep-ph | null | Talks presented at Beyond The Standard Model IV Conference, Lake Tahoe, Dec
94:
NEW FERMION FAMILIES AND PRECISION ELECTROWEAK DATA: We highlight a trend in
the precision electroweak data towards light new physics and argue that some
spectra of strongly interacting technifamilies are plausibly compatible with
the data.
FERMION MASSES IN EXTENDED TECHNICOLOUR: An ETC model with a minimal number
of operators responsible for fermion masses that break the global symmetries in
the observed manner postdicts the light quark masses. The up down mass
inversion may be explained by the inclusion of a family symmetric ansatz for
the CKM matrix angles.
| [
{
"created": "Mon, 16 Jan 1995 21:32:39 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Evans",
"Nick",
""
]
] | Talks presented at Beyond The Standard Model IV Conference, Lake Tahoe, Dec 94: NEW FERMION FAMILIES AND PRECISION ELECTROWEAK DATA: We highlight a trend in the precision electroweak data towards light new physics and argue that some spectra of strongly interacting technifamilies are plausibly compatible with the data. FERMION MASSES IN EXTENDED TECHNICOLOUR: An ETC model with a minimal number of operators responsible for fermion masses that break the global symmetries in the observed manner postdicts the light quark masses. The up down mass inversion may be explained by the inclusion of a family symmetric ansatz for the CKM matrix angles. |
0710.1843 | Pearl Sandick | Pearl Sandick | Dark Matter Phenomenology of GUT-less SUSY Breaking | 4 pages, 3 figures, Submitted for the SUSY07 proceedings | null | null | null | hep-ph | null | We study models in which supersymmetry breaking appears at an intermediate
scale, M_in, below the GUT scale. That is, that the soft supersymmetry-breaking
parameters of the MSSM are universal at M_in. We demand that the lightest
neutralino be the LSP, and that the relic neutralino density not conflict with
measurements by WMAP and others, and study the morphology of this constraint as
the universality scale is reduced from the GUT scale. At moderate values of
M_in, we find that the allowed regions of the (m_1/2,m_0) plane are squeezed by
the requirements of electroweak symmetry breaking and that the lightest
neutralino be the LSP, whereas the constraint on the relic density is less
severe. At very low M_in, the electroweak vacuum conditions become the dominant
constraint, and a secondary source of astrophysical cold dark matter would be
necessary to explain the measured relic density for nearly all values of the
soft SUSY-breaking parameters and tan(beta).
| [
{
"created": "Tue, 9 Oct 2007 18:07:31 GMT",
"version": "v1"
}
] | 2007-10-10 | [
[
"Sandick",
"Pearl",
""
]
] | We study models in which supersymmetry breaking appears at an intermediate scale, M_in, below the GUT scale. That is, that the soft supersymmetry-breaking parameters of the MSSM are universal at M_in. We demand that the lightest neutralino be the LSP, and that the relic neutralino density not conflict with measurements by WMAP and others, and study the morphology of this constraint as the universality scale is reduced from the GUT scale. At moderate values of M_in, we find that the allowed regions of the (m_1/2,m_0) plane are squeezed by the requirements of electroweak symmetry breaking and that the lightest neutralino be the LSP, whereas the constraint on the relic density is less severe. At very low M_in, the electroweak vacuum conditions become the dominant constraint, and a secondary source of astrophysical cold dark matter would be necessary to explain the measured relic density for nearly all values of the soft SUSY-breaking parameters and tan(beta). |
1608.04746 | Athanasios Karozas | Miguel Crispim Rom\~ao, Athanasios Karozas, Stephen F. King, George K.
Leontaris, Andrew K. Meadowcroft | R-Parity violation in F-Theory | 40 pages, 13 figures, minor corrections | null | 10.1007/JHEP11(2016)081 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss R-parity violation (RPV) in semi-local and local F-theory
constructions. We first present a detailed analysis of all possible
combinations of RPV operators arising from semi-local F-theory spectral cover
constructions, assuming an $SU(5)$ GUT. We provide a classification of all
possible allowed combinations of RPV operators originating from operators of
the form $10\cdot \bar 5\cdot \bar 5$, including the effect of $U(1)$ fluxes
with global restrictions. We then relax the global constraints and perform
explicit computations of the bottom/tau and RPV Yukawa couplings, at an
$SO(12)$ local point of enhancement in the presence of general fluxes subject
only to local flux restrictions. We compare our results to the experimental
limits on each allowed RPV operator, and show that operators such as $LLe^c$,
$LQd^c$ and $u^cd^cd^c$ may be present separately within current bounds,
possibly on the edge of observability, suggesting lepton number violation or
neutron-antineutron oscillations could constrain F-theory models.
| [
{
"created": "Tue, 16 Aug 2016 20:00:04 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Nov 2016 17:34:09 GMT",
"version": "v2"
}
] | 2016-11-24 | [
[
"Romão",
"Miguel Crispim",
""
],
[
"Karozas",
"Athanasios",
""
],
[
"King",
"Stephen F.",
""
],
[
"Leontaris",
"George K.",
""
],
[
"Meadowcroft",
"Andrew K.",
""
]
] | We discuss R-parity violation (RPV) in semi-local and local F-theory constructions. We first present a detailed analysis of all possible combinations of RPV operators arising from semi-local F-theory spectral cover constructions, assuming an $SU(5)$ GUT. We provide a classification of all possible allowed combinations of RPV operators originating from operators of the form $10\cdot \bar 5\cdot \bar 5$, including the effect of $U(1)$ fluxes with global restrictions. We then relax the global constraints and perform explicit computations of the bottom/tau and RPV Yukawa couplings, at an $SO(12)$ local point of enhancement in the presence of general fluxes subject only to local flux restrictions. We compare our results to the experimental limits on each allowed RPV operator, and show that operators such as $LLe^c$, $LQd^c$ and $u^cd^cd^c$ may be present separately within current bounds, possibly on the edge of observability, suggesting lepton number violation or neutron-antineutron oscillations could constrain F-theory models. |
2004.01852 | Carlos Andres Escobar Ruiz | C. A. Escobar and R. Potting | Degenerate behavior in nonlinear vacuum electrodynamics | 17 pages, 2 figures, Accepted for publication in Physica Scripta | null | 10.1088/1402-4896/ab842d | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study nonlinear vacuum electrodynamics in the first-order formulation
proposed by Pleba\'nski. We analyze in detail the equations of motion, and
identify conditions for which a singularity can occur for the time derivative
of one of the field components. The resulting degenerate behavior can give rise
to a shock wave with a reduction of the local number of degrees of freedom. We
use an example model to illustrate the occurrence of superluminal propagation
for field values approaching the singularity.
| [
{
"created": "Sat, 4 Apr 2020 04:59:12 GMT",
"version": "v1"
}
] | 2020-06-24 | [
[
"Escobar",
"C. A.",
""
],
[
"Potting",
"R.",
""
]
] | We study nonlinear vacuum electrodynamics in the first-order formulation proposed by Pleba\'nski. We analyze in detail the equations of motion, and identify conditions for which a singularity can occur for the time derivative of one of the field components. The resulting degenerate behavior can give rise to a shock wave with a reduction of the local number of degrees of freedom. We use an example model to illustrate the occurrence of superluminal propagation for field values approaching the singularity. |
1310.1107 | Pisin Chen | Pisin Chen | Recent Progress in Cosmology and Particle Astrophysics | 10 pages, 2 figures | null | null | null | hep-ph astro-ph.CO gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent years have seen dramatic progress in cosmology and particle
astrophysics. So much so that anyone who dares to offer an overview would
certainly risk him- or herself for being incomplete and biased at best, and
even incorrect due to the author's limited expertise. It is with this
understanding and excuse that I risk myself in offering this review. After a
brief summary of Planck mission's first results, I highlight some selected
theoretical and experimental advancement in dark energy, dark matter, and
cosmic neutrinos research. It is hoped that with a glance through these
exciting development, one would be convinced that we are now a step closer to
the ultimate understanding of our universe, while major breakthroughs are still
required.
| [
{
"created": "Thu, 3 Oct 2013 20:24:47 GMT",
"version": "v1"
}
] | 2013-10-07 | [
[
"Chen",
"Pisin",
""
]
] | Recent years have seen dramatic progress in cosmology and particle astrophysics. So much so that anyone who dares to offer an overview would certainly risk him- or herself for being incomplete and biased at best, and even incorrect due to the author's limited expertise. It is with this understanding and excuse that I risk myself in offering this review. After a brief summary of Planck mission's first results, I highlight some selected theoretical and experimental advancement in dark energy, dark matter, and cosmic neutrinos research. It is hoped that with a glance through these exciting development, one would be convinced that we are now a step closer to the ultimate understanding of our universe, while major breakthroughs are still required. |
hep-ph/0612112 | Heinrich Leutwyler | H. Leutwyler | pi pi scattering | Contribution to the proceedings of the workshop "Chiral Dynamics,
Theory & Experiment", Durham/Chapel Hill, NC, USA, September 2006 | null | 10.1142/9789812790804_0002 | null | hep-ph | null | Recent work in low energy pion physics is reviewed. One of the exciting new
developments in this field is that simulations of QCD on a lattice now start
providing information about the low energy structure of the continuum theory,
for physical values of the quark masses. Although the various sources of
systematic error yet need to be explored more thoroughly, the results obtained
for the correlation function of the axial current with the quantum numbers of
the pion already have important implications for the effective Lagrangian of
QCD. The consequences for $\pi\pi$ scattering are discussed in some detail. The
second part of the report briefly reviews recent developments in the dispersion
theory of the scattering amplitude. One of the important results here is that
the position of the lowest resonances of QCD can now be determined in a model
independent manner and rather precisely. Beyond any doubt, the partial wave
with $I=\ell=0$ contains a pole on the second sheet, not far from the
threshold: the lowest resonance of QCD carries the quantum numbers of the
vacuum.
| [
{
"created": "Mon, 11 Dec 2006 09:44:35 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Leutwyler",
"H.",
""
]
] | Recent work in low energy pion physics is reviewed. One of the exciting new developments in this field is that simulations of QCD on a lattice now start providing information about the low energy structure of the continuum theory, for physical values of the quark masses. Although the various sources of systematic error yet need to be explored more thoroughly, the results obtained for the correlation function of the axial current with the quantum numbers of the pion already have important implications for the effective Lagrangian of QCD. The consequences for $\pi\pi$ scattering are discussed in some detail. The second part of the report briefly reviews recent developments in the dispersion theory of the scattering amplitude. One of the important results here is that the position of the lowest resonances of QCD can now be determined in a model independent manner and rather precisely. Beyond any doubt, the partial wave with $I=\ell=0$ contains a pole on the second sheet, not far from the threshold: the lowest resonance of QCD carries the quantum numbers of the vacuum. |
1706.09469 | Sarira Sahu | Jose F. Nieves, Yaithd D. Olivas, Sarira Sahu | Neutrino dispersion relation in a magnetized multi-stream matter
background | Title changed, 21 pages, 1 figure | Eur.Phys.J. C78 (2018) no.5, 400 | 10.1140/epjc/s10052-018-5884-z | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the propagation of a neutrino in a medium that consists of two or
more thermal backgrounds of electrons and nucleons moving with some relative
velocity, in the presence of a static and homogeneous electromagnetic field. We
calculate the neutrino self-energy and dispersion relation using the linear
thermal Schwinger propagator, we give the formulas for the dispersion relation
and discuss general features of the results obtained, in particular the effects
of the stream contributions. As a specific example we discuss in some detail
the case of a magnetized two-stream electron, i.e., two electron backgrounds
with a relative velocity $\vec v$ in the presence of a magnetic field. For a
neutrino propagating with momentum $\vec k$, in the presence of the stream the
neutrino dispersion relation acquires an anisotropic contribution of the form
$\hat k\cdot\vec v$ in addition to the well known term $\hat k\cdot\vec B$, as
well as an additional contribution proportional to $\vec B\cdot\vec v$. We
consider the contribution from a nucleon stream background as an example of
other possible stream backgrounds, and comment on possible generalizations to
take into account the effects of inhomogeneous fields. We explain why a term of
the form $\hat k\cdot(\vec v\times\vec B)$ does not appear in the dispersion
relation in the constant field case, while a term of similar form can appear in
the presence of an inhomogeneous field involving its gradient.
| [
{
"created": "Wed, 28 Jun 2017 20:06:48 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Jul 2018 19:05:39 GMT",
"version": "v2"
}
] | 2018-07-31 | [
[
"Nieves",
"Jose F.",
""
],
[
"Olivas",
"Yaithd D.",
""
],
[
"Sahu",
"Sarira",
""
]
] | We study the propagation of a neutrino in a medium that consists of two or more thermal backgrounds of electrons and nucleons moving with some relative velocity, in the presence of a static and homogeneous electromagnetic field. We calculate the neutrino self-energy and dispersion relation using the linear thermal Schwinger propagator, we give the formulas for the dispersion relation and discuss general features of the results obtained, in particular the effects of the stream contributions. As a specific example we discuss in some detail the case of a magnetized two-stream electron, i.e., two electron backgrounds with a relative velocity $\vec v$ in the presence of a magnetic field. For a neutrino propagating with momentum $\vec k$, in the presence of the stream the neutrino dispersion relation acquires an anisotropic contribution of the form $\hat k\cdot\vec v$ in addition to the well known term $\hat k\cdot\vec B$, as well as an additional contribution proportional to $\vec B\cdot\vec v$. We consider the contribution from a nucleon stream background as an example of other possible stream backgrounds, and comment on possible generalizations to take into account the effects of inhomogeneous fields. We explain why a term of the form $\hat k\cdot(\vec v\times\vec B)$ does not appear in the dispersion relation in the constant field case, while a term of similar form can appear in the presence of an inhomogeneous field involving its gradient. |
1503.00859 | Ulrich Nierste | Philipp Frings, Ulrich Nierste, and Martin Wiebusch | Penguin contributions to CP phases in $B_{d,s}$ decays to charmonium | typo in Eqs. (2) and (3) corrected, references updated.Matches
version published in PRL | Phys. Rev. Lett. 115, 061802 (2015) | 10.1103/PhysRevLett.115.061802 | TTP15-006 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The precision of the CP phases $2\beta$ and $2\beta_s$ determined from the
mixing-induced CP asymmetries in $B_d\to J/\psi K_S$ and $B_s\to J/\psi \phi$,
respectively, is limited by the unknown long-distance contribution of a penguin
diagram involving up quarks. The penguin contribution is expected to be
comparable in size to the precision of the LHCb and Belle II experiments and
therefore limits the sensitivity of the measured quantities to new physics. We
analyze the infrared QCD structure of this contribution and find that all soft
and collinear divergences either cancel between different diagrams or factorize
into matrix elements of local four-quark operators up to terms suppressed by
$\Lambda_{QCD}/m_{\psi}$, where $m_{\psi}$ denotes the $J/\psi$ mass. Our
results, which are based on an operator product expansion, allow us to
calculate the penguin-to-tree ratio $P/T$ in terms of the matrix elements of
these operators and to constrain the penguin contribution to the phase $2\beta$
as $|\Delta \phi_d|\leq {0.68}^\circ$. The penguin contribution to $2\beta_s$
is bounded as $|\Delta \phi_s^{0}|\leq {0.97}^\circ$, $|\Delta
\phi_s^{\parallel}|\leq {1.22}^\circ$, and $|\Delta \phi_s^{\perp}|\leq
{0.99}^\circ$ for the case of longitudinal, parallel, and perpendicular $\phi$
and $J/\psi$ polarizations, respectively. We further place bounds on $|\Delta
\phi_d|$ for $B_d\to \psi(2S) K_S$ and the polarization amplitudes in $B_d\to
J/\psi K^*$. In our approach it is further possible to constrain $P/T$ for
decays in which $P/T$ is Cabibbo-unsuppressed and we derive upper limits on the
penguin contribution to the mixing-induced CP asymmetries in $B_d\to J/\psi
\pi^0$, $B_d\to J/\psi \rho^0$, $B_s\to J/\psi K_S$, and $B_s\to J/\psi K^*$.
For all studied decay modes we also constrain the sizes of the direct CP
asymmetries.
| [
{
"created": "Tue, 3 Mar 2015 08:52:19 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Jul 2015 16:54:02 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Aug 2015 15:34:49 GMT",
"version": "v3"
}
] | 2015-08-12 | [
[
"Frings",
"Philipp",
""
],
[
"Nierste",
"Ulrich",
""
],
[
"Wiebusch",
"Martin",
""
]
] | The precision of the CP phases $2\beta$ and $2\beta_s$ determined from the mixing-induced CP asymmetries in $B_d\to J/\psi K_S$ and $B_s\to J/\psi \phi$, respectively, is limited by the unknown long-distance contribution of a penguin diagram involving up quarks. The penguin contribution is expected to be comparable in size to the precision of the LHCb and Belle II experiments and therefore limits the sensitivity of the measured quantities to new physics. We analyze the infrared QCD structure of this contribution and find that all soft and collinear divergences either cancel between different diagrams or factorize into matrix elements of local four-quark operators up to terms suppressed by $\Lambda_{QCD}/m_{\psi}$, where $m_{\psi}$ denotes the $J/\psi$ mass. Our results, which are based on an operator product expansion, allow us to calculate the penguin-to-tree ratio $P/T$ in terms of the matrix elements of these operators and to constrain the penguin contribution to the phase $2\beta$ as $|\Delta \phi_d|\leq {0.68}^\circ$. The penguin contribution to $2\beta_s$ is bounded as $|\Delta \phi_s^{0}|\leq {0.97}^\circ$, $|\Delta \phi_s^{\parallel}|\leq {1.22}^\circ$, and $|\Delta \phi_s^{\perp}|\leq {0.99}^\circ$ for the case of longitudinal, parallel, and perpendicular $\phi$ and $J/\psi$ polarizations, respectively. We further place bounds on $|\Delta \phi_d|$ for $B_d\to \psi(2S) K_S$ and the polarization amplitudes in $B_d\to J/\psi K^*$. In our approach it is further possible to constrain $P/T$ for decays in which $P/T$ is Cabibbo-unsuppressed and we derive upper limits on the penguin contribution to the mixing-induced CP asymmetries in $B_d\to J/\psi \pi^0$, $B_d\to J/\psi \rho^0$, $B_s\to J/\psi K_S$, and $B_s\to J/\psi K^*$. For all studied decay modes we also constrain the sizes of the direct CP asymmetries. |
hep-ph/0211310 | Eung Jin Chun | E.J Chun, D.-W. Jung and J.D Park | Bi-large neutrino mixing from bilinear R-parity violation with
non-universality | 13 pages, 4 eps figures, revtex4 | Phys.Lett. B557 (2003) 233-239 | 10.1016/S0370-2693(03)00194-1 | null | hep-ph | null | We investigate how the bi-large mixing required by the recent neutrino data
can be accommodated in the supersymmetric standard model allowing bilinear
R-parity violation and non-universal soft terms. In this scheme, the tree-level
contribution and the so-called Grossman-Haber one-loop diagrams are two major
sources of the neutrino mass matrix. The relative size of these two
contributions falls into the right range to generate the atmospheric and solar
neutrino mass hierarchy. On the other hand, the bi-large mixing is typically
obtained by a mild tuning of input parameters to arrange a partial cancellation
among various contributions.
| [
{
"created": "Wed, 20 Nov 2002 05:38:26 GMT",
"version": "v1"
}
] | 2010-04-05 | [
[
"Chun",
"E. J",
""
],
[
"Jung",
"D. -W.",
""
],
[
"Park",
"J. D",
""
]
] | We investigate how the bi-large mixing required by the recent neutrino data can be accommodated in the supersymmetric standard model allowing bilinear R-parity violation and non-universal soft terms. In this scheme, the tree-level contribution and the so-called Grossman-Haber one-loop diagrams are two major sources of the neutrino mass matrix. The relative size of these two contributions falls into the right range to generate the atmospheric and solar neutrino mass hierarchy. On the other hand, the bi-large mixing is typically obtained by a mild tuning of input parameters to arrange a partial cancellation among various contributions. |
2408.02486 | J\"orn Knoll | J\"orn Knoll | The Fate of Weakly Bound Light Nuclei in Central Collider Experiments: a
Challenge in Favor of a Late Continuous Decoupling Mechanism | 6 pages, 3 figures, letter | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Arguments are presented that the reaction products of central high energy
nuclear collisions up to collider energies can rigorously be interpreted in
terms of a continuous decoupling mechanism based on continuous equations of
motion. The various aspects of the collision dynamics are investigate in terms
of the individual decoupling processes. Thereby each observed particle
decouples during its own temporal decoupling window. This includes a ``very
late'' decoupling of the faintly bound Hypertritons observed in recent ALICE
experiments. The success of the strategy relays on 200 years old wisdom and
leads to a revised interpretation of the entire decoupling process.
| [
{
"created": "Mon, 5 Aug 2024 14:06:08 GMT",
"version": "v1"
}
] | 2024-08-06 | [
[
"Knoll",
"Jörn",
""
]
] | Arguments are presented that the reaction products of central high energy nuclear collisions up to collider energies can rigorously be interpreted in terms of a continuous decoupling mechanism based on continuous equations of motion. The various aspects of the collision dynamics are investigate in terms of the individual decoupling processes. Thereby each observed particle decouples during its own temporal decoupling window. This includes a ``very late'' decoupling of the faintly bound Hypertritons observed in recent ALICE experiments. The success of the strategy relays on 200 years old wisdom and leads to a revised interpretation of the entire decoupling process. |
hep-ph/0306270 | Robert Fleischer | Robert Fleischer (CERN) | Flavour Symmetry and Clean Strategies to Extract $\gamma$ | Invited talk at the Workshop on the CKM Unitarity Triangle, IPPP
Durham, April 2003 (eConf C0304052). 10 pages LaTeX | ECONF C0304052:WG303,2003 | null | CERN-TH/2003-141 | hep-ph | null | One of the key elements in the testing of the Standard-Model description of
CP violation through $B$-meson decays is the direct determination of the angle
$\gamma$ of the unitarity triangle in a variety of ways. We give a brief
overview of the implications of the current $B$-factory data for
flavour-symmetry strategies, and discuss new, theoretically clean methods
employing pure tree decays of neutral $B_{d,s}$ mesons.
| [
{
"created": "Fri, 27 Jun 2003 08:51:35 GMT",
"version": "v1"
}
] | 2010-11-23 | [
[
"Fleischer",
"Robert",
"",
"CERN"
]
] | One of the key elements in the testing of the Standard-Model description of CP violation through $B$-meson decays is the direct determination of the angle $\gamma$ of the unitarity triangle in a variety of ways. We give a brief overview of the implications of the current $B$-factory data for flavour-symmetry strategies, and discuss new, theoretically clean methods employing pure tree decays of neutral $B_{d,s}$ mesons. |
1112.3174 | Rumin Wang | Ru-Min Wang, Yuan-Guo Xu, Yi-Long Wang, Ya-Dong Yang | Revisiting B_s\to\mu^+\mu^- and B\to K^{(*)}\mu^+\mu^- decays in the
MSSM with and without R-parity | 20 pages, 9 figures, published version | Phys.Rev. D85, 094004 (2012) | 10.1103/PhysRevD.85.094004 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The rare decays B_s -> \mu^+\mu^- and B -> K^{(*)}\mu^+\mu^- are sensitive to
new particles and couplings via their interferences with the standard model
contributions. Recently, the upper bound on B(B_s -> \mu^+\mu^-) has been
improved significantly by the CMS, LHCb, CDF, and D{\O} experiments. Combining
with the measurements of B(B-> K^{(*)}\mu^+\mu^-), we derive constraints on the
relevant parameters of minimal supersymmetic standard model with and without
R-parity, and examine their contributions to the dimuon forward-backward
asymmetry in B-> K^{*}\mu^+\mu^- decay. We find that (i) the contribution of
R-parity violating coupling products
\lambda^{\prime}_{2i2}\lambda^{\prime*}_{2i3} due to squark exchange is
comparable with the theoretical uncertainties in B-> K \mu^+\mu^- decay, but
still could be significant in B-> K^{*}\mu^+\mu^- decay and could account for
the forward-backward asymmetry in all dimuon invariant mass regions; (ii) the
constrained mass insertion (\delta^{u}_{LL})_{23} could have significant
contribution to dA_{FB}(B-> K^{*}\mu^+\mu^-)/ds, and such effects are favored
by thr recent results of the Belle, CDF, and LHCb experiments.
| [
{
"created": "Wed, 14 Dec 2011 11:39:32 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Dec 2011 03:20:42 GMT",
"version": "v2"
},
{
"created": "Fri, 13 Jul 2012 09:25:02 GMT",
"version": "v3"
}
] | 2015-03-13 | [
[
"Wang",
"Ru-Min",
""
],
[
"Xu",
"Yuan-Guo",
""
],
[
"Wang",
"Yi-Long",
""
],
[
"Yang",
"Ya-Dong",
""
]
] | The rare decays B_s -> \mu^+\mu^- and B -> K^{(*)}\mu^+\mu^- are sensitive to new particles and couplings via their interferences with the standard model contributions. Recently, the upper bound on B(B_s -> \mu^+\mu^-) has been improved significantly by the CMS, LHCb, CDF, and D{\O} experiments. Combining with the measurements of B(B-> K^{(*)}\mu^+\mu^-), we derive constraints on the relevant parameters of minimal supersymmetic standard model with and without R-parity, and examine their contributions to the dimuon forward-backward asymmetry in B-> K^{*}\mu^+\mu^- decay. We find that (i) the contribution of R-parity violating coupling products \lambda^{\prime}_{2i2}\lambda^{\prime*}_{2i3} due to squark exchange is comparable with the theoretical uncertainties in B-> K \mu^+\mu^- decay, but still could be significant in B-> K^{*}\mu^+\mu^- decay and could account for the forward-backward asymmetry in all dimuon invariant mass regions; (ii) the constrained mass insertion (\delta^{u}_{LL})_{23} could have significant contribution to dA_{FB}(B-> K^{*}\mu^+\mu^-)/ds, and such effects are favored by thr recent results of the Belle, CDF, and LHCb experiments. |
hep-ph/9411298 | Kazuhiro Tobe | J. Hisano, T. Moroi, K. Tobe, and T. Yanagida | Limit on the Color-Triplet Higgs Mass in the Minimum Supersymmetric
SU(5) Model | null | Mod.Phys.Lett. A10 (1995) 2267-2278 | 10.1142/S0217732395002428 | TU-470 | hep-ph | null | In the minimum supersymmetric SU(5) GUT, we derive the upper limit on the
mass of the color-triplet Higgs multiplets as $\mhc\leq 2.4\times 10^{16}~\GEV$
(90 \% C.L.) taking all possible corrections into account in a renormalization
group analysis. If the above upper limit is compared with a limit on $\mhc$
from the negative search for the proton decay; $\mhc \geq 2.0\times
10^{16}~\GEV$ (in which effects of the larger top-quark mass are included), the
minimum supersymmetric SU(5) GUT is severely constrained.
| [
{
"created": "Tue, 15 Nov 1994 07:20:15 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Nov 1994 09:42:46 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Hisano",
"J.",
""
],
[
"Moroi",
"T.",
""
],
[
"Tobe",
"K.",
""
],
[
"Yanagida",
"T.",
""
]
] | In the minimum supersymmetric SU(5) GUT, we derive the upper limit on the mass of the color-triplet Higgs multiplets as $\mhc\leq 2.4\times 10^{16}~\GEV$ (90 \% C.L.) taking all possible corrections into account in a renormalization group analysis. If the above upper limit is compared with a limit on $\mhc$ from the negative search for the proton decay; $\mhc \geq 2.0\times 10^{16}~\GEV$ (in which effects of the larger top-quark mass are included), the minimum supersymmetric SU(5) GUT is severely constrained. |
2311.02998 | Khiem Hong Phan | Dzung Tri Tran (DTU), Thanh Huy Nguyen (HCMUS), Khiem Hong Phan (DTU) | One-loop contributions for $h\rightarrow \ell \bar{\ell}\gamma$ and
$e^-e^+\rightarrow h\gamma$ in $U(1)_{B-L}$ extension of the standard model | 41 pages, to be published in Chinese Physics C | null | null | DTU2023-03 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We present one-loop contributing for $h\rightarrow \ell \bar{\ell}\gamma$
with $\ell =\nu_{e,\mu, \tau}, e, \mu$ and $e^-e^+\rightarrow h\gamma$ in
$U(1)_{B-L}$ extension of the standard models. In phenomenological results, the
signal strengths for $h\rightarrow \ell \bar{\ell}\gamma$ at Large Hadron
Collider and for $e^-e^+\rightarrow h\gamma$ at future Lepton Colliders are
analyzed in physical parameter space for both vector and chiral $B-L$ models.
We find that the contributions from neutral gauge boson $Z'$ to the signal
strengths are rather small. Consequently, the effects are hard to probe at
future colliders. While the impacts of charged Higgs, CP-odd Higgs in the
chiral $B-L$ model on the signal strengths are significant and can be measured
with the help of the initial polarization beams at future lepton colliders.
| [
{
"created": "Mon, 6 Nov 2023 10:06:10 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jan 2024 11:09:05 GMT",
"version": "v2"
}
] | 2024-01-31 | [
[
"Tran",
"Dzung Tri",
"",
"DTU"
],
[
"Nguyen",
"Thanh Huy",
"",
"HCMUS"
],
[
"Phan",
"Khiem Hong",
"",
"DTU"
]
] | We present one-loop contributing for $h\rightarrow \ell \bar{\ell}\gamma$ with $\ell =\nu_{e,\mu, \tau}, e, \mu$ and $e^-e^+\rightarrow h\gamma$ in $U(1)_{B-L}$ extension of the standard models. In phenomenological results, the signal strengths for $h\rightarrow \ell \bar{\ell}\gamma$ at Large Hadron Collider and for $e^-e^+\rightarrow h\gamma$ at future Lepton Colliders are analyzed in physical parameter space for both vector and chiral $B-L$ models. We find that the contributions from neutral gauge boson $Z'$ to the signal strengths are rather small. Consequently, the effects are hard to probe at future colliders. While the impacts of charged Higgs, CP-odd Higgs in the chiral $B-L$ model on the signal strengths are significant and can be measured with the help of the initial polarization beams at future lepton colliders. |
1508.06645 | Thomas Becher | Thomas Becher, Matthias Neubert, Lorena Rothen and Ding Yu Shao | An Effective Field Theory for Jet Processes | 9 pages, 1 figure. v2: PRL version | Phys. Rev. Lett. 116, 192001 (2016) | 10.1103/PhysRevLett.116.192001 | MITP/15-065 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Processes involving narrow jets receive perturbative corrections enhanced by
logarithms of the jet opening angle and the ratio of the energies inside and
outside the jets. Analyzing cone-jet processes in effective field theory, we
find that in addition to soft and collinear fields their description requires
degrees of freedom which are simultaneously soft and collinear to the jets.
These collinear-soft particles can resolve individual collinear partons,
leading to a complicated multi-Wilson-line structure of the associated
operators at higher orders. Our effective field theory provides, for the first
time, a factorization formula for a cone-jet process, which fully separates the
physics at different energy scales. Its renormalization-group equations control
all logarithmically enhanced higher-order terms, in particular also the
non-global logarithms.
| [
{
"created": "Wed, 26 Aug 2015 20:12:00 GMT",
"version": "v1"
},
{
"created": "Mon, 9 May 2016 20:27:45 GMT",
"version": "v2"
}
] | 2016-05-18 | [
[
"Becher",
"Thomas",
""
],
[
"Neubert",
"Matthias",
""
],
[
"Rothen",
"Lorena",
""
],
[
"Shao",
"Ding Yu",
""
]
] | Processes involving narrow jets receive perturbative corrections enhanced by logarithms of the jet opening angle and the ratio of the energies inside and outside the jets. Analyzing cone-jet processes in effective field theory, we find that in addition to soft and collinear fields their description requires degrees of freedom which are simultaneously soft and collinear to the jets. These collinear-soft particles can resolve individual collinear partons, leading to a complicated multi-Wilson-line structure of the associated operators at higher orders. Our effective field theory provides, for the first time, a factorization formula for a cone-jet process, which fully separates the physics at different energy scales. Its renormalization-group equations control all logarithmically enhanced higher-order terms, in particular also the non-global logarithms. |
0704.1991 | Ingo Schienbein | E. A. Paschos, I. Schienbein, J.-Y. Yu | Single pion electro-- and neutrinoproduction on heavy targets | 21 pages, 8 figures | null | null | DO-TH-07-05,LPSC-07-29,SMU-HEP-07-07 | hep-ph | null | We present a calculation of single pion electroproduction cross sections on
heavy targets in the kinematic region of the Delta(1232) resonance. Final state
interactions of the pions are taken into account using the pion multiple
scattering model of Adler, Nussinov and Paschos (ANP model). For
electroproduction and neutral current reactions we obtain results for carbon,
oxygen, argon and iron targets and find a significant reduction of the
W-spectra for pi^0 as compared to the free nucleon case. On the other hand, the
charged pion spectra are only little affected by final state interactions.
Measurements of such cross sections with the CLAS detector at JLAB could help
to improve our understanding of pion rescattering effects and serve as
important/valuable input for calculations of single pion neutrinoproduction on
heavy targets relevant for current and future long baseline neutrino
experiments. Two ratios, in Eq. (3.8) and (3.10), will test important
properties of the model.
| [
{
"created": "Mon, 16 Apr 2007 12:35:04 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Paschos",
"E. A.",
""
],
[
"Schienbein",
"I.",
""
],
[
"Yu",
"J. -Y.",
""
]
] | We present a calculation of single pion electroproduction cross sections on heavy targets in the kinematic region of the Delta(1232) resonance. Final state interactions of the pions are taken into account using the pion multiple scattering model of Adler, Nussinov and Paschos (ANP model). For electroproduction and neutral current reactions we obtain results for carbon, oxygen, argon and iron targets and find a significant reduction of the W-spectra for pi^0 as compared to the free nucleon case. On the other hand, the charged pion spectra are only little affected by final state interactions. Measurements of such cross sections with the CLAS detector at JLAB could help to improve our understanding of pion rescattering effects and serve as important/valuable input for calculations of single pion neutrinoproduction on heavy targets relevant for current and future long baseline neutrino experiments. Two ratios, in Eq. (3.8) and (3.10), will test important properties of the model. |
1904.11035 | Alessandro D.A.M. Spallicci di Filottrano | Jos\'e A. Helay\"el-Neto, Alessandro D.A.M. Spallicci | Frequency variation for in vacuo photon propagation in the
Standard-Model Extension | To appear as a letter in Eur. Phys. J. C. The paper proposes a new
shift to be superposed to the cosmological redshift | 2019, Eur. Phys. J. C, 79, 590 in final form | 10.1140/epjc/s10052-019-7105-9 | null | hep-ph astro-ph.CO gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the presence of Lorentz Symmetry Violation (LSV) associated with the
Standard-Model Extension (SME), we have recently shown the non-conservation of
the energy-momentum tensor of a light-wave crossing an Electro-Magnetic (EM)
background field even when the latter and the LSV are constant. Incidentally,
for a space-time dependent LSV, the presence of an EM field is not necessary.
Herein, we infer that in a particle description, the energy non-conservation
for a photon implies violation of frequency invariance in vacuo giving rise to
a red or blue shift. We discuss the potential consequences on cosmology.
| [
{
"created": "Wed, 24 Apr 2019 19:38:17 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jul 2019 08:52:26 GMT",
"version": "v2"
}
] | 2019-07-16 | [
[
"Helayël-Neto",
"José A.",
""
],
[
"Spallicci",
"Alessandro D. A. M.",
""
]
] | In the presence of Lorentz Symmetry Violation (LSV) associated with the Standard-Model Extension (SME), we have recently shown the non-conservation of the energy-momentum tensor of a light-wave crossing an Electro-Magnetic (EM) background field even when the latter and the LSV are constant. Incidentally, for a space-time dependent LSV, the presence of an EM field is not necessary. Herein, we infer that in a particle description, the energy non-conservation for a photon implies violation of frequency invariance in vacuo giving rise to a red or blue shift. We discuss the potential consequences on cosmology. |
1903.07590 | Matheus Hostert | Peter Ballett, Matheus Hostert and Silvia Pascoli | Neutrino Masses from a Dark Neutrino Sector below the Electroweak Scale | 7 pages, 2 figures, matches published version | Phys. Rev. D 99, 091701 (2019) | 10.1103/PhysRevD.99.091701 | IPPP/19/21 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a minimal extension of the Standard Model which advocates a dark
neutrino sector charged under a hidden $U(1)^\prime$. We show that neutrino
masses can arise radiatively in this model. The observed values are compatible
with a light dark sector below the electroweak scale and would imply new heavy
fermions which may be testable in the next generation of beam dump searches at
DUNE, NA62 and SHIP.
| [
{
"created": "Mon, 18 Mar 2019 17:31:32 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Jun 2019 14:58:01 GMT",
"version": "v2"
}
] | 2019-06-10 | [
[
"Ballett",
"Peter",
""
],
[
"Hostert",
"Matheus",
""
],
[
"Pascoli",
"Silvia",
""
]
] | We consider a minimal extension of the Standard Model which advocates a dark neutrino sector charged under a hidden $U(1)^\prime$. We show that neutrino masses can arise radiatively in this model. The observed values are compatible with a light dark sector below the electroweak scale and would imply new heavy fermions which may be testable in the next generation of beam dump searches at DUNE, NA62 and SHIP. |
hep-ph/0202097 | Gautam Dutta | G. Dutta | Can radiative correction cause large neutrino mixing? | corrected references and minor changes in text | null | null | null | hep-ph | null | We investigate whether radiative corrections can be responsible for the
generation of large mixing in a pair of degenerate neutrino with same CP
parity. We find that this mechanism is fine tuned and doesn't work for
arbitrary mixing at the high scale.
| [
{
"created": "Mon, 11 Feb 2002 12:40:53 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Feb 2002 11:07:07 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Apr 2002 12:53:41 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Dutta",
"G.",
""
]
] | We investigate whether radiative corrections can be responsible for the generation of large mixing in a pair of degenerate neutrino with same CP parity. We find that this mechanism is fine tuned and doesn't work for arbitrary mixing at the high scale. |
1309.0831 | Rodolfo A. Diaz | Andres Castillo, Rodolfo A. Diaz, John Morales | Unitarity constraints for Yukawa couplings in the two Higgs doublet
model type III | 14 pages, 2 figures, LaTeX2e | Int. J. Mod Phys A. Vol. 29, No. 18 (2014) 1450085 | 10.1142/S0217751X14500857 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Unitarity constraints for Yukawa couplings are considered in the Two Higgs
Doublet Model type III, by using a general expansion in partial waves for
fermionic scattering processes. Constraints over general Flavor Changing
Neutral Currents are found from that systematic, such bounds compete with those
coming from Lagrangian perturbativity requirement but are weaker than those
imposed from phenomenological processes and precision tests. Nevertheless, for
bounds based on unitarity the number of assumptions is the lowest among
phenomenological and theoretical limits. Indeed, these new theoretical
constraints are independent of scalar masses or mixing angles for this extended
Higgs sector, making them less model dependent.
| [
{
"created": "Tue, 3 Sep 2013 20:22:08 GMT",
"version": "v1"
}
] | 2014-08-07 | [
[
"Castillo",
"Andres",
""
],
[
"Diaz",
"Rodolfo A.",
""
],
[
"Morales",
"John",
""
]
] | Unitarity constraints for Yukawa couplings are considered in the Two Higgs Doublet Model type III, by using a general expansion in partial waves for fermionic scattering processes. Constraints over general Flavor Changing Neutral Currents are found from that systematic, such bounds compete with those coming from Lagrangian perturbativity requirement but are weaker than those imposed from phenomenological processes and precision tests. Nevertheless, for bounds based on unitarity the number of assumptions is the lowest among phenomenological and theoretical limits. Indeed, these new theoretical constraints are independent of scalar masses or mixing angles for this extended Higgs sector, making them less model dependent. |
hep-ph/0401189 | Marco Peloso | Lev Kofman, Johannes Martin and Marco Peloso | Exact identification of the radion and its coupling to the observable
sector | 20 pages, 6 figures | Phys.Rev. D70 (2004) 085015 | 10.1103/PhysRevD.70.085015 | null | hep-ph astro-ph gr-qc hep-th | null | Braneworld models in extra dimensions can be tested in laboratory by the
coupling of the radion to the Standard Model fields. The identification of the
radion as a canonically normalized field involves a careful General Relativity
treatment: if a bulk scalar is responsible for the stabilization of the system,
its fluctuations are entangled with the perturbations of the metric and they
also have to be taken into account (similarly to the well-developed theory of
scalar metric perturbations in 4D cosmology with a scalar field). Extracting a
proper dynamical variable in a warped geometry/scalar setting is a nontrivial
task, performed so far only in the limit of negligible backreaction of the
scalar field on the background geometry. We perform the general calculation,
diagonalizing the action up to second order in the perturbations and
identifying the physical eigenmodes of the system for any amplitude of the bulk
scalar. This computation allows us to derive a very simple expression for the
exact coupling of the eigenmodes to the Standard Model fields on the brane,
valid for an arbitrary background configuration. As an application, we discuss
the Goldberger-Wise mechanism for the stabilization of the radion in the
Randall-Sundrum type models. The existing studies, limited to small amplitude
of the bulk scalar field, are characterized by a radion mass which is
significantly below the physical scale at the observable brane. We extend them
beyond the small backreaction regime. For intermediate amplitudes, the radion
mass approaches the electroweak scale, while its coupling to the observable
brane remains nearly constant. At very high amplitudes, the radion mass instead
decreases, while the coupling sharply increases. Severe experimental
constraints are expected in this regime.
| [
{
"created": "Mon, 26 Jan 2004 20:36:57 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Kofman",
"Lev",
""
],
[
"Martin",
"Johannes",
""
],
[
"Peloso",
"Marco",
""
]
] | Braneworld models in extra dimensions can be tested in laboratory by the coupling of the radion to the Standard Model fields. The identification of the radion as a canonically normalized field involves a careful General Relativity treatment: if a bulk scalar is responsible for the stabilization of the system, its fluctuations are entangled with the perturbations of the metric and they also have to be taken into account (similarly to the well-developed theory of scalar metric perturbations in 4D cosmology with a scalar field). Extracting a proper dynamical variable in a warped geometry/scalar setting is a nontrivial task, performed so far only in the limit of negligible backreaction of the scalar field on the background geometry. We perform the general calculation, diagonalizing the action up to second order in the perturbations and identifying the physical eigenmodes of the system for any amplitude of the bulk scalar. This computation allows us to derive a very simple expression for the exact coupling of the eigenmodes to the Standard Model fields on the brane, valid for an arbitrary background configuration. As an application, we discuss the Goldberger-Wise mechanism for the stabilization of the radion in the Randall-Sundrum type models. The existing studies, limited to small amplitude of the bulk scalar field, are characterized by a radion mass which is significantly below the physical scale at the observable brane. We extend them beyond the small backreaction regime. For intermediate amplitudes, the radion mass approaches the electroweak scale, while its coupling to the observable brane remains nearly constant. At very high amplitudes, the radion mass instead decreases, while the coupling sharply increases. Severe experimental constraints are expected in this regime. |
1106.0479 | Biplab Dey | Biplab Dey, Curtis A. Meyer | Normalization discrepancies in photoproduction reactions | This expands upon a talk given at NSTAR'11. It is also a preliminary
draft only | null | null | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent CLAS photoproduction results using a tagged bremsstrahlung photon beam
for the ground-state pseudoscalar meson photoproduction channels ($K^+
\Lambda$, $K^+ \Sigma^0$, $\eta p$, $\pi^+ n$ and $\pi^0 p$) show a
normalization discrepancy with older results from SLAC, DESY and CEA that used
an untagged bremsstrahlung beam. The CLAS results are roughly a factor of two
smaller than the older data. The CLAS $K^+\Lambda$ and $K^+\Sigma^0$ results
are in excellent agreement with the latest LEPS results that also employed a
tagged beam. For the vector meson ($\omega p$ and $\phi p$) channels, CLAS
agrees with SLAC results that employed a linearly polarized beam using laser
back-scattering, as well as Daresbury data that also came from tagged photon
experiment. We perform a global survey of these normalization issues and stress
on their significant effect on the coupling constants used in various partial
wave analyses.
| [
{
"created": "Thu, 2 Jun 2011 18:18:38 GMT",
"version": "v1"
}
] | 2011-06-03 | [
[
"Dey",
"Biplab",
""
],
[
"Meyer",
"Curtis A.",
""
]
] | Recent CLAS photoproduction results using a tagged bremsstrahlung photon beam for the ground-state pseudoscalar meson photoproduction channels ($K^+ \Lambda$, $K^+ \Sigma^0$, $\eta p$, $\pi^+ n$ and $\pi^0 p$) show a normalization discrepancy with older results from SLAC, DESY and CEA that used an untagged bremsstrahlung beam. The CLAS results are roughly a factor of two smaller than the older data. The CLAS $K^+\Lambda$ and $K^+\Sigma^0$ results are in excellent agreement with the latest LEPS results that also employed a tagged beam. For the vector meson ($\omega p$ and $\phi p$) channels, CLAS agrees with SLAC results that employed a linearly polarized beam using laser back-scattering, as well as Daresbury data that also came from tagged photon experiment. We perform a global survey of these normalization issues and stress on their significant effect on the coupling constants used in various partial wave analyses. |
1810.10017 | Yi-Ming Zhong | Martin Schmaltz, Yi-Ming Zhong | The Leptoquark Hunter's Guide: Large Coupling | 33 pages + references, 15 figures, 9 tables, v2: references added | null | 10.1007/JHEP01(2019)132 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Leptoquarks have recently received much attention especially because they may
provide an explanation to the $R_{D^{(*)}}$ and $R_{K^{(*)}}$ anomalies in rare
$B$ meson decays. In a previous paper we proposed a systematic search strategy
for all possible leptoquark flavors by focusing on leptoquark pair production.
In this paper, we extend this strategy to large (order unity) leptoquark
couplings which offer new search opportunities: single leptoquark production
and $t$-channel leptoquark exchange with dilepton final states. We discuss the
unique features of the different search channels and show that they cover
complementary regions of parameter space. We collect and update all currently
available bounds for the different flavor final states from LHC searches and
from atomic parity violation measurements. As an application of our analysis,
we find that current limits do not exclude the leptoquark explanation of the
$B$ physics anomalies but that the high luminosity run of the LHC will reach
the most interesting parameter space.
| [
{
"created": "Tue, 23 Oct 2018 18:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Nov 2018 19:11:19 GMT",
"version": "v2"
}
] | 2019-02-20 | [
[
"Schmaltz",
"Martin",
""
],
[
"Zhong",
"Yi-Ming",
""
]
] | Leptoquarks have recently received much attention especially because they may provide an explanation to the $R_{D^{(*)}}$ and $R_{K^{(*)}}$ anomalies in rare $B$ meson decays. In a previous paper we proposed a systematic search strategy for all possible leptoquark flavors by focusing on leptoquark pair production. In this paper, we extend this strategy to large (order unity) leptoquark couplings which offer new search opportunities: single leptoquark production and $t$-channel leptoquark exchange with dilepton final states. We discuss the unique features of the different search channels and show that they cover complementary regions of parameter space. We collect and update all currently available bounds for the different flavor final states from LHC searches and from atomic parity violation measurements. As an application of our analysis, we find that current limits do not exclude the leptoquark explanation of the $B$ physics anomalies but that the high luminosity run of the LHC will reach the most interesting parameter space. |
1301.1695 | Giulia Zanderighi | Barbara Jager and Giulia Zanderighi | Electroweak W+W-jj prodution at NLO in QCD matched with parton shower in
the POWHEG-BOX | 17 pages, 8 figures | null | 10.1007/JHEP04(2013)024 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an implementation of electroweak W+W-jj production at hadron
colliders in the POWHEG framework, a method that allows the interfacing of a
next-to-leading order QCD calculation with parton shower Monte Carlo programs.
We provide results for both, fully and semi-leptonic decay modes of the weak
bosons, taking resonant and non-resonant contributions and spin correlations of
the final-state particles into account. To illustrate the versatility of our
implementation, we provide phenomenological results for two representative
scenarios with a light and with a heavy Higgs boson, respectively, and in a
kinematic regime of highly boosted gauge bosons. The impact of the parton
shower is found to depend on the setup and the observable under investigation.
In particular, distributions related to a central-jet veto are more sensitive
to these effects. Therefore the impact of radiation by the parton shower on
next-to-leading order predictions should be assessed carefully on a
case-by-case basis.
| [
{
"created": "Tue, 8 Jan 2013 21:10:51 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Jager",
"Barbara",
""
],
[
"Zanderighi",
"Giulia",
""
]
] | We present an implementation of electroweak W+W-jj production at hadron colliders in the POWHEG framework, a method that allows the interfacing of a next-to-leading order QCD calculation with parton shower Monte Carlo programs. We provide results for both, fully and semi-leptonic decay modes of the weak bosons, taking resonant and non-resonant contributions and spin correlations of the final-state particles into account. To illustrate the versatility of our implementation, we provide phenomenological results for two representative scenarios with a light and with a heavy Higgs boson, respectively, and in a kinematic regime of highly boosted gauge bosons. The impact of the parton shower is found to depend on the setup and the observable under investigation. In particular, distributions related to a central-jet veto are more sensitive to these effects. Therefore the impact of radiation by the parton shower on next-to-leading order predictions should be assessed carefully on a case-by-case basis. |
2108.06550 | Yao Fu | Siqi Yang, Yao Fu, Minghui Liu, Renyou Zhang, Tie-Jiun Hou, Chen Wang,
Hang Yin, Liang Han, C.--P. Yuan | Reduction of the electroweak correlation in the PDF updating by using
the forward-backward asymmetry of Drell-Yan process | null | null | 10.1140/epjc/s10052-022-10280-6 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new observable for the measurement of the forward-backward
asymmetry $(A_{FB})$ in Drell-Yan lepton production. At hadron colliders, the
$A_{FB}$ distribution is sensitive to both the electroweak (EW) fundamental
parameter $\sin^2 \theta_{W}$, the weak mixing angle, and the parton
distribution functions (PDFs). Hence, the determination of $\sin^2 \theta_{W}$
and the updating of PDFs by directly using the same $A_{FB}$ spectrum are
strongly correlated. This correlation would introduce large bias or uncertainty
into both precise measurements of EW and PDF sectors. In this article, we show
that the sensitivity of $A_{FB}$ on $\sin^2 \theta_{W}$ is dominated by its
average value around the $Z$ pole region, while the shape (or gradient) of the
$A_{FB}$ spectrum is insensitive to $\sin^2 \theta_{W}$ and contains important
information on the PDF modeling. Accordingly, a new observable related to the
gradient of the spectrum is introduced, and demonstrated to be able to
significantly reduce the potential bias on the determination of $\sin^2
\theta_{W}$ when updating the PDFs using the same $A_{FB}$ data.
| [
{
"created": "Sat, 14 Aug 2021 14:29:50 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Nov 2021 08:44:52 GMT",
"version": "v2"
}
] | 2022-05-11 | [
[
"Yang",
"Siqi",
""
],
[
"Fu",
"Yao",
""
],
[
"Liu",
"Minghui",
""
],
[
"Zhang",
"Renyou",
""
],
[
"Hou",
"Tie-Jiun",
""
],
[
"Wang",
"Chen",
""
],
[
"Yin",
"Hang",
""
],
[
"Han",
"Liang",
""
],
[
"Yuan",
"C. --P.",
""
]
] | We propose a new observable for the measurement of the forward-backward asymmetry $(A_{FB})$ in Drell-Yan lepton production. At hadron colliders, the $A_{FB}$ distribution is sensitive to both the electroweak (EW) fundamental parameter $\sin^2 \theta_{W}$, the weak mixing angle, and the parton distribution functions (PDFs). Hence, the determination of $\sin^2 \theta_{W}$ and the updating of PDFs by directly using the same $A_{FB}$ spectrum are strongly correlated. This correlation would introduce large bias or uncertainty into both precise measurements of EW and PDF sectors. In this article, we show that the sensitivity of $A_{FB}$ on $\sin^2 \theta_{W}$ is dominated by its average value around the $Z$ pole region, while the shape (or gradient) of the $A_{FB}$ spectrum is insensitive to $\sin^2 \theta_{W}$ and contains important information on the PDF modeling. Accordingly, a new observable related to the gradient of the spectrum is introduced, and demonstrated to be able to significantly reduce the potential bias on the determination of $\sin^2 \theta_{W}$ when updating the PDFs using the same $A_{FB}$ data. |
1109.6354 | Argyris Nicolaidis | A. Nicolaidis | Neutrino Shortcuts in Spacetime | To appear in Mod. Phys. Lett. A 2012 | null | 10.1142/S0217732312501271 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Theories with large extra dimensions may be tested using sterile neutrinos
living in the bulk. A bulk neutrino can mix with a flavor neutrino localized in
the brane leading to unconventional patterns of neutrino oscillations. A
resonance phenomenon, strong mixing between the flavor and the sterile
neutrino, allows to determine the radius of the large extra dimension. If our
brane is curved, then the sterile neutrino can take a shortcut through the
bulk, leading to an apparent superluminal neutrino speed. The amount of
"superluminality" is directly connected to parameters determining the shape of
the brane. On the experimental side, we suggest that a long baseline neutrino
beam from CERN to NESTOR neutrino telescope will help to clarify these
important issues.
| [
{
"created": "Wed, 28 Sep 2011 20:51:29 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Nov 2011 18:32:09 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Dec 2011 16:07:31 GMT",
"version": "v3"
},
{
"created": "Tue, 3 Jul 2012 11:24:58 GMT",
"version": "v4"
}
] | 2016-11-27 | [
[
"Nicolaidis",
"A.",
""
]
] | Theories with large extra dimensions may be tested using sterile neutrinos living in the bulk. A bulk neutrino can mix with a flavor neutrino localized in the brane leading to unconventional patterns of neutrino oscillations. A resonance phenomenon, strong mixing between the flavor and the sterile neutrino, allows to determine the radius of the large extra dimension. If our brane is curved, then the sterile neutrino can take a shortcut through the bulk, leading to an apparent superluminal neutrino speed. The amount of "superluminality" is directly connected to parameters determining the shape of the brane. On the experimental side, we suggest that a long baseline neutrino beam from CERN to NESTOR neutrino telescope will help to clarify these important issues. |
1403.3144 | Qingguo Zeng | Qing-Guo Zeng, Shuo Yang, Chong-Xing Yue, You Yu | Associated production of the heavy charged gauge boson ${W_{H}}$ and a
top quark at LHC | 16 pages, 6 figures | null | 10.1209/0295-5075/107/41002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of topflavor seesaw model, we study the production of the
heavy charged gauge boson ${W_{H}}$ associated with a top quark at the LHC.
Focusing on the searching channel $pp\rightarrow tW_H\rightarrow t\bar{t}b
\rightarrow l\nu jjbbb$, we carry out a full simulation of the signal and the
relevant standard model backgrounds. The kinematical distributions of final
states are presented. It is found that the backgrounds can be significantly
suppressed by sets of kinematic cuts, and the signal of the heavy charged boson
might be detected at the LHC with $\sqrt{s}=14$ TeV. With a integrated
luminosity of $\LL= $ 100 $fb^{-1}$, a $8.3 \sigma$ signal significance can be
achieved for $m_{W_H}=1.6$ TeV.
| [
{
"created": "Thu, 13 Mar 2014 01:13:42 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Zeng",
"Qing-Guo",
""
],
[
"Yang",
"Shuo",
""
],
[
"Yue",
"Chong-Xing",
""
],
[
"Yu",
"You",
""
]
] | In the context of topflavor seesaw model, we study the production of the heavy charged gauge boson ${W_{H}}$ associated with a top quark at the LHC. Focusing on the searching channel $pp\rightarrow tW_H\rightarrow t\bar{t}b \rightarrow l\nu jjbbb$, we carry out a full simulation of the signal and the relevant standard model backgrounds. The kinematical distributions of final states are presented. It is found that the backgrounds can be significantly suppressed by sets of kinematic cuts, and the signal of the heavy charged boson might be detected at the LHC with $\sqrt{s}=14$ TeV. With a integrated luminosity of $\LL= $ 100 $fb^{-1}$, a $8.3 \sigma$ signal significance can be achieved for $m_{W_H}=1.6$ TeV. |
hep-ph/9704258 | Csaba Balazs | C. Balazs and C.-P. Yuan | Soft gluon effects on lepton pairs at hadron colliders | 50 pages, REVTeX, 16 figures (27 eps files) | Phys.Rev. D56 (1997) 5558-5583 | 10.1103/PhysRevD.56.5558 | MSUHEP-70402, CTEQ-704 | hep-ph | null | With a large integrated luminosity expected at the Tevatron, a
next-to-leading order (NLO) calculation is no longer sufficient to describe the
data which yield the precision measurement of $M_W$, etc. Thus, we extend the
Collins-Soper-Sterman resummation formalism, for on-shell vector boson
production, to correctly include the effects of the polarization and the width
of the vector boson to the distributions of the decay leptons. We show how to
test the rich dynamics of the QCD multiple soft gluon radiation, for example,
by measuring the ratio $R_{CSS} \equiv \frac{\sigma (Q_T>Q_T^{\min})}{\sigma
_{Total}}$. ($Q_T$ is the transverse momentum of the vector boson.) We conclude
that both the total rates and the distributions of the lepton charge asymmetry
predicted by the resummed and the NLO calculations are different when kinematic
cuts are applied.
| [
{
"created": "Tue, 8 Apr 1997 22:58:56 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Balazs",
"C.",
""
],
[
"Yuan",
"C. -P.",
""
]
] | With a large integrated luminosity expected at the Tevatron, a next-to-leading order (NLO) calculation is no longer sufficient to describe the data which yield the precision measurement of $M_W$, etc. Thus, we extend the Collins-Soper-Sterman resummation formalism, for on-shell vector boson production, to correctly include the effects of the polarization and the width of the vector boson to the distributions of the decay leptons. We show how to test the rich dynamics of the QCD multiple soft gluon radiation, for example, by measuring the ratio $R_{CSS} \equiv \frac{\sigma (Q_T>Q_T^{\min})}{\sigma _{Total}}$. ($Q_T$ is the transverse momentum of the vector boson.) We conclude that both the total rates and the distributions of the lepton charge asymmetry predicted by the resummed and the NLO calculations are different when kinematic cuts are applied. |
hep-ph/0209185 | Marcus Mauser | H.S. Do, S. Groote, J.G. K\"orner, M.C. Mauser | Electroweak and finite width corrections to top quark decays into
transverse and longitudinal $ W $-bosons | 4 pages, 7 postscript figures added | Phys.Rev.D67:091501,2003 | 10.1103/PhysRevD.67.091501 | MZ-TH/01-03 | hep-ph | null | We calculate the electroweak and finite width corrections to the decay of an
unpolarized top quark into a bottom quark and a $ W $-gauge boson where the
helicities of the $ W $ are specified as longitudinal, transverse-plus and
transverse-minus. Together with the $ O(\alpha_s) $ corrections these
corrections may become relevant for the determination of the mass of the top
quark through angular decay measurements.
| [
{
"created": "Tue, 17 Sep 2002 10:36:05 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Sep 2002 08:19:12 GMT",
"version": "v2"
}
] | 2011-03-23 | [
[
"Do",
"H. S.",
""
],
[
"Groote",
"S.",
""
],
[
"Körner",
"J. G.",
""
],
[
"Mauser",
"M. C.",
""
]
] | We calculate the electroweak and finite width corrections to the decay of an unpolarized top quark into a bottom quark and a $ W $-gauge boson where the helicities of the $ W $ are specified as longitudinal, transverse-plus and transverse-minus. Together with the $ O(\alpha_s) $ corrections these corrections may become relevant for the determination of the mass of the top quark through angular decay measurements. |
1502.04199 | Victor Ilisie | Victor Ilisie | New Barr-Zee contributions to $\mathbf{(g-2)_\mu}$ in two-Higgs-doublet
models | 28 pages, 17 figures. Typos corrected. Matches JHEP version. arXiv
admin note: text overlap with arXiv:1210.8443 by other authors | JHEP 04 (2015) 077 | 10.1007/JHEP04(2015)077 | FTUV/15-0213, IFIC/15-09 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the contribution of new sets of two-loop Barr-Zee type diagrams to
the anomalous magnetic moment of the muon within the two-Higgs-doublet model
framework. We show that some of these contributions can be quite sizeable for a
large region of the parameter space and can significantly reduce, and in some
cases even explain, the discrepancy between the theoretical prediction and the
experimentally measured value of this observable. Analytical expressions are
given for all the calculations performed in this work.
| [
{
"created": "Sat, 14 Feb 2015 12:07:38 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Feb 2015 09:45:47 GMT",
"version": "v2"
},
{
"created": "Mon, 18 May 2015 13:54:08 GMT",
"version": "v3"
}
] | 2015-05-19 | [
[
"Ilisie",
"Victor",
""
]
] | We study the contribution of new sets of two-loop Barr-Zee type diagrams to the anomalous magnetic moment of the muon within the two-Higgs-doublet model framework. We show that some of these contributions can be quite sizeable for a large region of the parameter space and can significantly reduce, and in some cases even explain, the discrepancy between the theoretical prediction and the experimentally measured value of this observable. Analytical expressions are given for all the calculations performed in this work. |
1202.6012 | Kuang-Ta Chao | Kai Wang, Yan-Qing Ma, Kuang-Ta Chao | $\Upsilon(1S)$ prompt production at the Tevatron and LHC in
nonrelativistic QCD | Version published in PRD, references added, 15 pages, 3 figures | Phys. Rev. D85, 114003 (2012) | 10.1103/PhysRevD.85.114003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With nonrelativistic QCD factorization, we calculate the $\Upsilon(1S)$
prompt production at hadron colliders at next-to-leading order in $\alpha_s$.
In addition to the color-singlet contribution, color-octet channels (especially
the P-wave channel) up to $O(v^4)$ are all considered. Aside from direct
production, the feed-down contributions from higher excited S-wave and P-wave
$b\bar b$ states to $\Upsilon(1S)$ production are also included. We use the
potential model estimates as input for color-singlet long-distance matrix
elements (LDMEs). While for color-octet contributions, we find they can be
approximately described by three LDMEs: $\mo{}{3}{S}{1}{8}$,
$\mo{}{1}{S}{0}{8}$ and $\mo{}{3}{P}{0}{8}$. By fitting the Tevatron data we
can determine some linear combinations of these LDMEs, and then use them to
predict $\Upsilon(1S)$ production at the LHC. Our predictions are consistent
with the new experimental data of CMS and LHCb.
| [
{
"created": "Mon, 27 Feb 2012 18:03:10 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Jun 2012 18:29:08 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Wang",
"Kai",
""
],
[
"Ma",
"Yan-Qing",
""
],
[
"Chao",
"Kuang-Ta",
""
]
] | With nonrelativistic QCD factorization, we calculate the $\Upsilon(1S)$ prompt production at hadron colliders at next-to-leading order in $\alpha_s$. In addition to the color-singlet contribution, color-octet channels (especially the P-wave channel) up to $O(v^4)$ are all considered. Aside from direct production, the feed-down contributions from higher excited S-wave and P-wave $b\bar b$ states to $\Upsilon(1S)$ production are also included. We use the potential model estimates as input for color-singlet long-distance matrix elements (LDMEs). While for color-octet contributions, we find they can be approximately described by three LDMEs: $\mo{}{3}{S}{1}{8}$, $\mo{}{1}{S}{0}{8}$ and $\mo{}{3}{P}{0}{8}$. By fitting the Tevatron data we can determine some linear combinations of these LDMEs, and then use them to predict $\Upsilon(1S)$ production at the LHC. Our predictions are consistent with the new experimental data of CMS and LHCb. |
1012.0102 | Pyungwon Ko | Dong-won Jung, P. Ko, Jae Sik Lee and Soo-hyeon Nam | Model-independent analysis of forward-backward asymmetry of top quark
production at the Tevatron | Prepared for the proceedings of Blois Conference and ICHEP 2010 | PoS ICHEP2010:397,2010 | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a model independent analysis on $q \bar{q} \rightarrow t \bar{t}$
using an effective lagrangian with dim-6 four-quark operators, and derive
necessary conditions on new physics that are consistent with the $t\bar{t}$
production cross section %($\sigma_{t\bar{t}}$) and and the forward-backward
(FB) asymmetry ($A_{\rm FB}$) measured at the Tevatron. We also propose a new
FB spin-spin correlation that is strongly correlated with the $A_{\rm FB}$, and
discuss possible new physics scenarios that could generate such dim-6
operators.
| [
{
"created": "Wed, 1 Dec 2010 05:58:15 GMT",
"version": "v1"
}
] | 2011-09-08 | [
[
"Jung",
"Dong-won",
""
],
[
"Ko",
"P.",
""
],
[
"Lee",
"Jae Sik",
""
],
[
"Nam",
"Soo-hyeon",
""
]
] | We perform a model independent analysis on $q \bar{q} \rightarrow t \bar{t}$ using an effective lagrangian with dim-6 four-quark operators, and derive necessary conditions on new physics that are consistent with the $t\bar{t}$ production cross section %($\sigma_{t\bar{t}}$) and and the forward-backward (FB) asymmetry ($A_{\rm FB}$) measured at the Tevatron. We also propose a new FB spin-spin correlation that is strongly correlated with the $A_{\rm FB}$, and discuss possible new physics scenarios that could generate such dim-6 operators. |
1405.3987 | Antonio Racioppi | Kristjan Kannike, Antonio Racioppi, Martti Raidal | Embedding inflation into the Standard Model - more evidence for
classical scale invariance | 20 pages, 6 figures, revised version published on JHEP | JHEP 1406 (2014) 154 | 10.1007/JHEP06(2014)154 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If cosmological inflation is due to a slowly rolling single inflation field
taking trans-Planckian values as suggested by the BICEP2 measurement of
primordial tensor modes in CMB, embedding inflation into the Standard Model
challenges standard paradigm of effective field theories. Together with an
apparent absence of Planck scale contributions to the Higgs mass and to the
cosmological constant, BICEP2 provides further experimental evidence for the
absence of large $M_{\rm P}$ induced operators. We show that classical scale
invariance, the paradigm that all fundamental scales in Nature are induced by
quantum effects, solves the problem and allows for a remarkably simple
scale-free Standard Model extension with inflaton without extending the gauge
group. Due to trans-Planckian inflaton values and vevs, a dynamically induced
Coleman-Weinberg-type inflaton potential of the model can predict
tensor-to-scalar ratio $r$ in a large range, converging around the prediction
of chaotic $m^2\phi^2$ inflation for a large trans-Planckian value of the
inflaton vev. Precise determination of $r$ in future experiments will single
out a unique scale-free inflation potential, allowing to test the proposed
field-theoretic framework.
| [
{
"created": "Thu, 15 May 2014 20:00:19 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Oct 2014 12:21:09 GMT",
"version": "v2"
}
] | 2014-10-14 | [
[
"Kannike",
"Kristjan",
""
],
[
"Racioppi",
"Antonio",
""
],
[
"Raidal",
"Martti",
""
]
] | If cosmological inflation is due to a slowly rolling single inflation field taking trans-Planckian values as suggested by the BICEP2 measurement of primordial tensor modes in CMB, embedding inflation into the Standard Model challenges standard paradigm of effective field theories. Together with an apparent absence of Planck scale contributions to the Higgs mass and to the cosmological constant, BICEP2 provides further experimental evidence for the absence of large $M_{\rm P}$ induced operators. We show that classical scale invariance, the paradigm that all fundamental scales in Nature are induced by quantum effects, solves the problem and allows for a remarkably simple scale-free Standard Model extension with inflaton without extending the gauge group. Due to trans-Planckian inflaton values and vevs, a dynamically induced Coleman-Weinberg-type inflaton potential of the model can predict tensor-to-scalar ratio $r$ in a large range, converging around the prediction of chaotic $m^2\phi^2$ inflation for a large trans-Planckian value of the inflaton vev. Precise determination of $r$ in future experiments will single out a unique scale-free inflation potential, allowing to test the proposed field-theoretic framework. |
hep-ph/9607337 | null | Marc Sher | The Coleman-Weinberg Phase Transition in Extended Higgs Models | 13 pages, latex, one encoded figure | Phys.Rev. D54 (1996) 7071-7074 | 10.1103/PhysRevD.54.7071 | WM-96-107 | hep-ph | null | In Coleman-Weinberg symmetry breaking, all dimensionful parameters vanish and
the symmetry is broken by loop corrections. Before Coleman-Weinberg symmetry
breaking in the Standard Model was experimentally ruled out, it had already
been excluded on cosmological grounds. In this Brief Report, the cosmological
analysis is carried out for Coleman-Weinberg models with extended Higgs
sectors, which are not experimentally ruled out, and general constraints on
such models are given.
| [
{
"created": "Tue, 16 Jul 1996 14:27:54 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Sher",
"Marc",
""
]
] | In Coleman-Weinberg symmetry breaking, all dimensionful parameters vanish and the symmetry is broken by loop corrections. Before Coleman-Weinberg symmetry breaking in the Standard Model was experimentally ruled out, it had already been excluded on cosmological grounds. In this Brief Report, the cosmological analysis is carried out for Coleman-Weinberg models with extended Higgs sectors, which are not experimentally ruled out, and general constraints on such models are given. |
hep-ph/9611430 | Peter Haberl | P. Haberl | CP violating couplings in Z -> 3 jet decays revisited | LaTeX, 11 pages, 4 figures | null | null | HD-THEP-96-16 | hep-ph | null | Possible CP violating effects in $Z\rightarrow$ 3 jet decays are
investigated. The analysis assumes the presence of CP violating $Zq\bar qG$
couplings. The contribution of these couplings to the $Z\rightarrow q\bar qG$
decay width is calculated for different cut algorithms, including nonzero quark
masses. Various CP--odd observables are discussed and it is shown that their
sensitivity can change significantly if one uses normalized or unnormalized
momentum vectors for their construction. Optimal observables are proposed which
allow to measure the new couplings simultaneously.
| [
{
"created": "Tue, 26 Nov 1996 15:09:25 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Haberl",
"P.",
""
]
] | Possible CP violating effects in $Z\rightarrow$ 3 jet decays are investigated. The analysis assumes the presence of CP violating $Zq\bar qG$ couplings. The contribution of these couplings to the $Z\rightarrow q\bar qG$ decay width is calculated for different cut algorithms, including nonzero quark masses. Various CP--odd observables are discussed and it is shown that their sensitivity can change significantly if one uses normalized or unnormalized momentum vectors for their construction. Optimal observables are proposed which allow to measure the new couplings simultaneously. |
hep-ph/9904215 | Jan Kalinowski | Debajyoti Choudhury (Mehta Res. Inst.), Jan Kalinowski (Univ. of
Warsaw) and Anna Kulesza (Durham Univ.) | CP-violating Anomalous $WW\gamma$ Couplings in e^+e^- Collisions | 13 pages (LaTeX), 5 figures (embedded) | Phys.Lett.B457:193-201,1999 | 10.1016/S0370-2693(99)00527-4 | DTP-99/06, IFT/99-01, MRI-PHY/P990173 | hep-ph | null | We investigate the sensitivity of future linear collider experiments to CP
violating $WW\gamma$ couplings in the process $e^{+}e^{-} \to
\nu\bar{\nu}\gamma$. We consider several sets of machine parameters: centre of
mass energies $\sqrt{s}$ = 350, 500 and 800 GeV and operating at different
luminosities. From an analysis of the differential cross-section the following
95% C.L. limits $|\tilde{\kappa}_{\gamma}| < 0.18$, $|\tilde{\lambda}_{\gamma}|
< 0.069$ are estimated to be obtained at a future 500 GeV LC with an integrated
luminosity of $125 \fb^{-1}$, a great improvement as compared to the LEP2
reach, where a senstitivity of order 2 for both couplings is found.
| [
{
"created": "Fri, 2 Apr 1999 09:04:48 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Choudhury",
"Debajyoti",
"",
"Mehta Res. Inst."
],
[
"Kalinowski",
"Jan",
"",
"Univ. of\n Warsaw"
],
[
"Kulesza",
"Anna",
"",
"Durham Univ."
]
] | We investigate the sensitivity of future linear collider experiments to CP violating $WW\gamma$ couplings in the process $e^{+}e^{-} \to \nu\bar{\nu}\gamma$. We consider several sets of machine parameters: centre of mass energies $\sqrt{s}$ = 350, 500 and 800 GeV and operating at different luminosities. From an analysis of the differential cross-section the following 95% C.L. limits $|\tilde{\kappa}_{\gamma}| < 0.18$, $|\tilde{\lambda}_{\gamma}| < 0.069$ are estimated to be obtained at a future 500 GeV LC with an integrated luminosity of $125 \fb^{-1}$, a great improvement as compared to the LEP2 reach, where a senstitivity of order 2 for both couplings is found. |
hep-ph/0601156 | Maxim Dvornikov | Maxim Dvornikov | Evolution of coupled fermions under the influence of an external
axial-vector field | RevTeX4, 8 pages, 1 eps figure; revised variant, neutral currents
interactions of flavor neutrinos are included, some typos corrected, 1
reference added; accepted for publication in Eur.Phys.J.C | Eur.Phys.J.C47:437-444,2006 | 10.1140/epjc/s2006-02597-3 | HUPD 0603 | hep-ph hep-th | null | The evolution of coupled fermions interacting with external axial-vector
fields is described with help of the classical field theory. We formulate the
initial conditions problem for the system of two coupled fermions in
(3+1)-dimensional space-time. This problem is solved using the perturbation
theory. We obtain in the explicit form the expressions for the leading and next
to the leading order terms in the expansion over the strength of external
fields. It is shown that in the relativistic limit the intensity of the fermion
field coincides with the transition probability in the two neutrinos system
interacting with moving and polarized matter.
| [
{
"created": "Thu, 19 Jan 2006 11:36:51 GMT",
"version": "v1"
},
{
"created": "Thu, 25 May 2006 08:59:00 GMT",
"version": "v2"
}
] | 2009-01-07 | [
[
"Dvornikov",
"Maxim",
""
]
] | The evolution of coupled fermions interacting with external axial-vector fields is described with help of the classical field theory. We formulate the initial conditions problem for the system of two coupled fermions in (3+1)-dimensional space-time. This problem is solved using the perturbation theory. We obtain in the explicit form the expressions for the leading and next to the leading order terms in the expansion over the strength of external fields. It is shown that in the relativistic limit the intensity of the fermion field coincides with the transition probability in the two neutrinos system interacting with moving and polarized matter. |
2401.10000 | Bao-Xi Sun | Bao-Xi Sun, Qin-Qin Cao and Ying-Tai Sun | The possible $K \bar{K}^*$ and $D \bar{D}^*$ bound and resonance states
by solving Schrodinger equation | 9 pages, 2 tables, 4 figures, to be published in Communications in
Theoretical Physics | 2024 Commun. Theor. Phys. 76, 105301 | 10.1088/1572-9494/ad51df | null | hep-ph nucl-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | The Schrodinger equation with a Yukawa type of potential is solved
analytically. When different boundary conditions are taken into account, a
series of solutions are indicated as Bessel function, the first kind of Hankel
function and the second kind of Hankel function, respectively. Subsequently,
the scattering processes of $K \bar{K}^*$ and $D \bar{ D}^*$ are investigated.
In the $K \bar{K}^*$ sector, the $f_1(1285)$ particle is treated as a $K
\bar{K}^*$ bound state, therefore, the coupling constant in the $K \bar{K}^*$
Yukawa potential can be fixed according to the binding energy of the
$f_1(1285)$ particle. Consequently, a $K \bar{K}^*$ resonance state is
generated by solving the Schrodinger equation with the outgoing wave condition,
which lie at $1417-i18$MeV on the complex energy plane. It is reasonable to
assume that the $K \bar{K}^*$ resonance state at $1417-i18$MeV might correspond
to the $f_1(1420)$ particle in the review of Particle Data Group(PDG).In the $D
\bar{D}^*$ sector, since the $X(3872)$ particle is almost located at the $D
\bar{ D}^*$ threshold, the binding energy of it equals to zero approximately.
Therefore, the coupling constant in the $D \bar{ D}^*$ Yukawa potential is
determined, which is related to the first zero point of the zero order Bessel
function. Similarly to the $K \bar{K}^*$ case, four resonance states are
produced as solutions of the Schrodinger equation with the outgoing wave
condition. It is assumed that the resonance states at $3885-i1$MeV, $4029-i108$
MeV, $4328-i191$MeV and $4772-i267$MeV might be associated with the $Zc(3900)$,
the $X(3940)$, the $\chi_{c1}(4274)$ and $\chi_{c1}(4685)$ particles,
respectively. It is noted that all solutions are isospin degenerate.
| [
{
"created": "Thu, 18 Jan 2024 14:15:46 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Jun 2024 10:54:43 GMT",
"version": "v2"
}
] | 2024-08-08 | [
[
"Sun",
"Bao-Xi",
""
],
[
"Cao",
"Qin-Qin",
""
],
[
"Sun",
"Ying-Tai",
""
]
] | The Schrodinger equation with a Yukawa type of potential is solved analytically. When different boundary conditions are taken into account, a series of solutions are indicated as Bessel function, the first kind of Hankel function and the second kind of Hankel function, respectively. Subsequently, the scattering processes of $K \bar{K}^*$ and $D \bar{ D}^*$ are investigated. In the $K \bar{K}^*$ sector, the $f_1(1285)$ particle is treated as a $K \bar{K}^*$ bound state, therefore, the coupling constant in the $K \bar{K}^*$ Yukawa potential can be fixed according to the binding energy of the $f_1(1285)$ particle. Consequently, a $K \bar{K}^*$ resonance state is generated by solving the Schrodinger equation with the outgoing wave condition, which lie at $1417-i18$MeV on the complex energy plane. It is reasonable to assume that the $K \bar{K}^*$ resonance state at $1417-i18$MeV might correspond to the $f_1(1420)$ particle in the review of Particle Data Group(PDG).In the $D \bar{D}^*$ sector, since the $X(3872)$ particle is almost located at the $D \bar{ D}^*$ threshold, the binding energy of it equals to zero approximately. Therefore, the coupling constant in the $D \bar{ D}^*$ Yukawa potential is determined, which is related to the first zero point of the zero order Bessel function. Similarly to the $K \bar{K}^*$ case, four resonance states are produced as solutions of the Schrodinger equation with the outgoing wave condition. It is assumed that the resonance states at $3885-i1$MeV, $4029-i108$ MeV, $4328-i191$MeV and $4772-i267$MeV might be associated with the $Zc(3900)$, the $X(3940)$, the $\chi_{c1}(4274)$ and $\chi_{c1}(4685)$ particles, respectively. It is noted that all solutions are isospin degenerate. |
0706.3399 | Iain W. Stewart | Ambar Jain, Ira Z. Rothstein, Iain W. Stewart | Penguin Loops for Nonleptonic B-Decays in the Standard Model: Is there a
Penguin Puzzle? | 39 pages | null | null | MIT-CTP 3828 | hep-ph | null | We compute standard model penguin amplitudes in nonleptonic B-decays to light
charmless mesons using tree amplitude data to fix hadronic parameters. The
leading calculation is carried out for the alphas(mb) penguin contributions
from charm quark, up quark, and magnetic penguin loops in the NDR and HV
renormalization schemes. Power suppressed penguins that are proportional to the
chiral condensate are also computed using a new factorization formula for these
terms, which is derived working to all orders in alphas(sqrt{mb\Lambda}). We
demonstrate using SCET1 that this formula exhibits only small perturbative
phases and does not have endpoint singularities. Due to our use of data to fix
hadronic parameters we obtain significantly more accurate predictions for the
short-distance standard model penguin amplitudes than have been found in the
past. Analyzing data in B-> pi pi, B->K pi, and B->rho rho for the penguin
amplitudes we find that standard model short-distance imaginary parts are an
order of magnitude smaller than current measurements, while real parts are up
to a factor of two smaller with the correct sign. This difference is most
likely a consequence of long-distance charm contributions or new physics.
Constraints on the type of new physics that could help explain the data are
derived, and used to show that current data favors sizeable long-distance
strong phases.
| [
{
"created": "Mon, 25 Jun 2007 19:53:44 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jul 2007 21:18:51 GMT",
"version": "v2"
}
] | 2007-07-17 | [
[
"Jain",
"Ambar",
""
],
[
"Rothstein",
"Ira Z.",
""
],
[
"Stewart",
"Iain W.",
""
]
] | We compute standard model penguin amplitudes in nonleptonic B-decays to light charmless mesons using tree amplitude data to fix hadronic parameters. The leading calculation is carried out for the alphas(mb) penguin contributions from charm quark, up quark, and magnetic penguin loops in the NDR and HV renormalization schemes. Power suppressed penguins that are proportional to the chiral condensate are also computed using a new factorization formula for these terms, which is derived working to all orders in alphas(sqrt{mb\Lambda}). We demonstrate using SCET1 that this formula exhibits only small perturbative phases and does not have endpoint singularities. Due to our use of data to fix hadronic parameters we obtain significantly more accurate predictions for the short-distance standard model penguin amplitudes than have been found in the past. Analyzing data in B-> pi pi, B->K pi, and B->rho rho for the penguin amplitudes we find that standard model short-distance imaginary parts are an order of magnitude smaller than current measurements, while real parts are up to a factor of two smaller with the correct sign. This difference is most likely a consequence of long-distance charm contributions or new physics. Constraints on the type of new physics that could help explain the data are derived, and used to show that current data favors sizeable long-distance strong phases. |
hep-ph/9611366 | Helmut Satz | Helmut Satz | Colour deconfinement in hot and dense matter | 11 pages tex, uses macro-hs.tex, 10 figures; talk given at CRIS '96,
First Catania Relativistic Ion Studies, Acicastello, Italy, May 27 - 31,
1996; to appear in the Proceedings | null | null | CERN-TH/96-172, BI-TP 96/25 | hep-ph nucl-th | null | We first introduce the conceptual basis of critical behaviour in strongly
interacting matter, with colour deconfinement as QCD analog of the
insulator-conductor transition and chiral symmetry restoration as special case
of the associated shift in the mass of the constituents. Next we summarize
quark-gluon plasma formation in finite temperature lattice QCD. We consider the
underlying symmetries and their spontaneous breaking/restoration in the
transition, as well as the resulting changes in thermodynamic behaviour.
Finally, we turn to the experimental study of strongly interacting matter by
high energy nuclear collisions, using charmonium production to probe the
confinement status of the produced primordial medium. Recent results from Pb-Pb
collisions at CERN may provide first evidence for colour deconfinement.
| [
{
"created": "Tue, 19 Nov 1996 17:02:29 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Satz",
"Helmut",
""
]
] | We first introduce the conceptual basis of critical behaviour in strongly interacting matter, with colour deconfinement as QCD analog of the insulator-conductor transition and chiral symmetry restoration as special case of the associated shift in the mass of the constituents. Next we summarize quark-gluon plasma formation in finite temperature lattice QCD. We consider the underlying symmetries and their spontaneous breaking/restoration in the transition, as well as the resulting changes in thermodynamic behaviour. Finally, we turn to the experimental study of strongly interacting matter by high energy nuclear collisions, using charmonium production to probe the confinement status of the produced primordial medium. Recent results from Pb-Pb collisions at CERN may provide first evidence for colour deconfinement. |
0811.1787 | Saba Zuberi | Francisco Campanario, Michael Luke, Saba Zuberi | High order perturbative corrections to the determination of |Vub| from
the P+ spectrum in B -> Xu l nu | 20 pages, 2 figures | Phys.Rev.D79:094007,2009 | 10.1103/PhysRevD.79.094007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the behaviour of the perturbative relation between the photon
energy spectrum in B -> Xs gamma and the hadronic P+ spectrum in semileptonic B
-> Xu l nu decay at high orders in perturbation theory in the "large-beta_0"
limit, in which only terms of order alpha_s^n beta_0^(n-1) are retained. The
leading renormalon in the weight function W(Delta,P_gamma) relating the two
spectra is confirmed to be at u=1/2, corresponding to nonperturbative
corrections at O(Lambda_QCD/m_b). We show that the P_gamma dependent pieces of
the weight function have no infrared renormalons in this limit, and so the
factorial growth in perturbation theory arises solely from the constant terms.
We find no numerical enhancement of leading logarithms, suggesting that
fixed-order perturbation theory is more appropriate than a leading-log
resummation for the extraction of |Vub|. The importance of various terms in the
expansion of the weight function is studied using a model for the B -> Xs gamma
photon spectrum. Our analysis suggests that higher order perturbative
corrections do not introduce a significant uncertainty in the extraction of
|Vub|.
| [
{
"created": "Tue, 11 Nov 2008 22:29:22 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Apr 2009 20:02:17 GMT",
"version": "v2"
}
] | 2009-09-02 | [
[
"Campanario",
"Francisco",
""
],
[
"Luke",
"Michael",
""
],
[
"Zuberi",
"Saba",
""
]
] | We investigate the behaviour of the perturbative relation between the photon energy spectrum in B -> Xs gamma and the hadronic P+ spectrum in semileptonic B -> Xu l nu decay at high orders in perturbation theory in the "large-beta_0" limit, in which only terms of order alpha_s^n beta_0^(n-1) are retained. The leading renormalon in the weight function W(Delta,P_gamma) relating the two spectra is confirmed to be at u=1/2, corresponding to nonperturbative corrections at O(Lambda_QCD/m_b). We show that the P_gamma dependent pieces of the weight function have no infrared renormalons in this limit, and so the factorial growth in perturbation theory arises solely from the constant terms. We find no numerical enhancement of leading logarithms, suggesting that fixed-order perturbation theory is more appropriate than a leading-log resummation for the extraction of |Vub|. The importance of various terms in the expansion of the weight function is studied using a model for the B -> Xs gamma photon spectrum. Our analysis suggests that higher order perturbative corrections do not introduce a significant uncertainty in the extraction of |Vub|. |
2104.11804 | Andreas Ekstedt | Andreas Ekstedt | Higher-Order Corrections to the Bubble-Nucleation Rate at Finite
Temperature | Moved several subsections to the appendix. Additional details added
in section 2 | null | 10.1140/epjc/s10052-022-10130-5 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper I discuss how to consistently incorporate higher-order
corrections to the bubble-nucleation rate at finite temperature. Doing so I
examine the merits of different approaches, with the goal of reducing
uncertainties for gravitational-wave calculations. To be specific, the region
of applicability and accuracy of the derivative expansion is discussed. The
derivative expansion is then compared to a numerical implementation of the
Gelfand-Yaglom theorem. Both methods are applied to popular first-order phase
transition models, like a loop-induced barrier and a SM-EFT tree-level barrier.
The results of these calculations are presented in easy-to-use parametrizations
that can directly be used in gravitational-wave calculations. In addition,
higher-order corrections for models with multiple scalar fields, such as
singlet/triplet extensions, are studied. Lastly, the convergence and
uncertainty of all calculations are discussed in detail. And I argue that
leading-order results for the Standard Model with a tree-level barrier might be
inaccurate.
| [
{
"created": "Fri, 23 Apr 2021 19:59:18 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Feb 2022 12:20:46 GMT",
"version": "v2"
}
] | 2022-03-01 | [
[
"Ekstedt",
"Andreas",
""
]
] | In this paper I discuss how to consistently incorporate higher-order corrections to the bubble-nucleation rate at finite temperature. Doing so I examine the merits of different approaches, with the goal of reducing uncertainties for gravitational-wave calculations. To be specific, the region of applicability and accuracy of the derivative expansion is discussed. The derivative expansion is then compared to a numerical implementation of the Gelfand-Yaglom theorem. Both methods are applied to popular first-order phase transition models, like a loop-induced barrier and a SM-EFT tree-level barrier. The results of these calculations are presented in easy-to-use parametrizations that can directly be used in gravitational-wave calculations. In addition, higher-order corrections for models with multiple scalar fields, such as singlet/triplet extensions, are studied. Lastly, the convergence and uncertainty of all calculations are discussed in detail. And I argue that leading-order results for the Standard Model with a tree-level barrier might be inaccurate. |
hep-ph/0511302 | Gavin Salam | Yu. L. Dokshitzer, G. Marchesini and G. P. Salam | Revisiting parton evolution and the large-x limit | 6 pages, v2 corrects misprints and contains an additional reference | Phys.Lett.B634:504-507,2006 | 10.1016/j.physletb.2006.02.023 | Bicocca-FT-05-31, LPTHE-05-31 | hep-ph | null | This remark is part of an ongoing project to simplify the structure of the
multi-loop anomalous dimensions for parton distributions and fragmentation
functions. It answers the call for a "structural explanation" of a "very
suggestive" relation found by Moch, Vermaseren and Vogt in the context of the
x->1 behaviour of three-loop DIS anomalous dimensions. It also highlights
further structure that remains to be fully explained.
| [
{
"created": "Sun, 27 Nov 2005 15:06:41 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jan 2006 17:23:50 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Dokshitzer",
"Yu. L.",
""
],
[
"Marchesini",
"G.",
""
],
[
"Salam",
"G. P.",
""
]
] | This remark is part of an ongoing project to simplify the structure of the multi-loop anomalous dimensions for parton distributions and fragmentation functions. It answers the call for a "structural explanation" of a "very suggestive" relation found by Moch, Vermaseren and Vogt in the context of the x->1 behaviour of three-loop DIS anomalous dimensions. It also highlights further structure that remains to be fully explained. |
hep-ph/0102188 | Rohini M. Godbole | Rohini M. Godbole, G. Pancheri | $\sigma^{tot}_{ee \gamma \gamma}$ at $e^+e^-$ colliders} | 10 pages, 3 figures, LaTeX, uses aipproc.cls and aipproc.sty. Talk to
appear in the proceedings of International Linear Collider Workshop (LCWS)
2000, October 26-30, 2000, Fermilab | null | null | IISc-CTS/03/01, LNF-01/008(P) | hep-ph | null | In this talk I briefly summarize different models for $\sigma^{tot}_{2
\gamma}$ ($e^+e^- \to \gamma \gamma \to$ hadrons) and contrast model
predictions with the data. I will then discuss the capability of the future
$e^+e^-$ and $\gamma \gamma$ colliders to distinguish between various models
and end with an outlook for future work.
| [
{
"created": "Thu, 15 Feb 2001 14:24:11 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Godbole",
"Rohini M.",
""
],
[
"Pancheri",
"G.",
""
]
] | In this talk I briefly summarize different models for $\sigma^{tot}_{2 \gamma}$ ($e^+e^- \to \gamma \gamma \to$ hadrons) and contrast model predictions with the data. I will then discuss the capability of the future $e^+e^-$ and $\gamma \gamma$ colliders to distinguish between various models and end with an outlook for future work. |
hep-ph/9212318 | null | Z.G.Berezhiani, R.N.Mohapatra and G.Senjanovic | Planck-Scale Physics and Solutions to the Strong CP Problem without
Axion | 14 pages, LaTex, IC/92/432, UMDHEP 93-105, LMU-16/92 (minor
clarifications in the introduction; missing references are added) | Phys.Rev.D47:5565-5570,1993 | 10.1103/PhysRevD.47.5565 | null | hep-ph | null | We analyse the impact of quantum gravity on the possible solutions to the
strong CP problem which utilize the spontaneously broken discrete symmetries,
such as parity and time reversal invariance. We find that the stability of the
solution under Planck scale effects provides an upper limit on the scale
$\Lambda$ of relevant symmetry breaking. This result is model dependent and the
bound is most restrictive for the seesaw type models of fermion masses, with
$\Lambda < 10^6$ GeV.
| [
{
"created": "Thu, 31 Dec 1992 17:05:00 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Jan 1993 20:28:00 GMT",
"version": "v2"
}
] | 2010-11-01 | [
[
"Berezhiani",
"Z. G.",
""
],
[
"Mohapatra",
"R. N.",
""
],
[
"Senjanovic",
"G.",
""
]
] | We analyse the impact of quantum gravity on the possible solutions to the strong CP problem which utilize the spontaneously broken discrete symmetries, such as parity and time reversal invariance. We find that the stability of the solution under Planck scale effects provides an upper limit on the scale $\Lambda$ of relevant symmetry breaking. This result is model dependent and the bound is most restrictive for the seesaw type models of fermion masses, with $\Lambda < 10^6$ GeV. |
1603.05592 | Davide Racco | Enrico Morgante, Davide Racco, Mohamed Rameez and Antonio Riotto | The 750 GeV Diphoton excess, Dark Matter and Constraints from the
IceCube experiment | 20 pages, 6 figures; v2: added references; v3: published version,
with some minor edits and including the exclusion bounds from searches of
gamma rays | JHEP 1607 (2016) 141 | 10.1007/JHEP07(2016)141 | null | hep-ph astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent LHC data show hints of a new resonance in the diphoton distribution at
an invariant mass of 750 GeV. Interestingly, this new particle might be both CP
odd and play the role of a portal into the dark matter sector. Under these
assumptions and motivated by the fact that the requirement of $SU(2)_L$
invariance automatically implies the coupling of this alleged new resonance to
$ZZ$ and $Z\gamma$, we investigate the current and future constraints coming
from the indirect searches performed through the neutrino telescope IceCube. We
show that these constraints can be stronger than the ones from direct detection
experiments if the dark matter mass is larger than a few hundred GeV.
Furthermore, in the scenario in which the dark matter is a scalar particle, the
IceCube data limit the cross section between the DM and the proton to values
close to the predicted ones for natural values of the parameters.
| [
{
"created": "Thu, 17 Mar 2016 17:53:35 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Mar 2016 17:07:38 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Aug 2016 14:03:28 GMT",
"version": "v3"
}
] | 2016-08-23 | [
[
"Morgante",
"Enrico",
""
],
[
"Racco",
"Davide",
""
],
[
"Rameez",
"Mohamed",
""
],
[
"Riotto",
"Antonio",
""
]
] | Recent LHC data show hints of a new resonance in the diphoton distribution at an invariant mass of 750 GeV. Interestingly, this new particle might be both CP odd and play the role of a portal into the dark matter sector. Under these assumptions and motivated by the fact that the requirement of $SU(2)_L$ invariance automatically implies the coupling of this alleged new resonance to $ZZ$ and $Z\gamma$, we investigate the current and future constraints coming from the indirect searches performed through the neutrino telescope IceCube. We show that these constraints can be stronger than the ones from direct detection experiments if the dark matter mass is larger than a few hundred GeV. Furthermore, in the scenario in which the dark matter is a scalar particle, the IceCube data limit the cross section between the DM and the proton to values close to the predicted ones for natural values of the parameters. |
2006.13942 | Rebecca Leane | Djuna Croon, Gilly Elor, Rebecca K. Leane, Samuel D. McDermott | Supernova Muons: New Constraints on Z' Bosons, Axions, and ALPs | 29 pages, several hot pink figures. v2: figs 7 and 8 updated,
references added | null | 10.1007/JHEP01(2021)107 | MIT-CTP/5214, FERMILAB-PUB-20-246-A-T | hep-ph astro-ph.CO astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New light particles produced in supernovae can lead to additional energy loss
and a consequent deficit in neutrino production in conflict with the neutrinos
observed from Supernova 1987A (SN1987A). Contrary to the majority of previous
SN1987A studies, we examine the impact of $Z'$ bosons, axions, and axion-like
particles (ALPs) interacting with the muons produced in SN1987A. For the first
time, we find constraints on generic $Z'$ bosons coupled to muons, and apply
our results to particle models including gauged $L_\mu-L_\tau$ number,
$U(1)_{L_\mu-L_\tau}$, and gauged $B-L$ number, $U(1)_{B-L}$. We constrain $Z'$
bosons with masses up to about 250-500 MeV, and down to about $10^{-9}$ in
$Z'$-muon coupling. We also extend previous work on axion-muon couplings by
examining the importance of loop-level interactions, as well as performing
calculations over a wider range of axion masses. We constrain muon-coupled
axions from arbitrarily low masses up to about 200-500 MeV, with bounds
extending down to axion-muon couplings of approximately $10^{-8}$ GeV$^{-1}$.
We conclude that supernovae broadly provide a sensitive probe of new
lightly-coupled particles interacting with muons.
| [
{
"created": "Wed, 24 Jun 2020 18:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jun 2020 12:55:46 GMT",
"version": "v2"
}
] | 2021-02-03 | [
[
"Croon",
"Djuna",
""
],
[
"Elor",
"Gilly",
""
],
[
"Leane",
"Rebecca K.",
""
],
[
"McDermott",
"Samuel D.",
""
]
] | New light particles produced in supernovae can lead to additional energy loss and a consequent deficit in neutrino production in conflict with the neutrinos observed from Supernova 1987A (SN1987A). Contrary to the majority of previous SN1987A studies, we examine the impact of $Z'$ bosons, axions, and axion-like particles (ALPs) interacting with the muons produced in SN1987A. For the first time, we find constraints on generic $Z'$ bosons coupled to muons, and apply our results to particle models including gauged $L_\mu-L_\tau$ number, $U(1)_{L_\mu-L_\tau}$, and gauged $B-L$ number, $U(1)_{B-L}$. We constrain $Z'$ bosons with masses up to about 250-500 MeV, and down to about $10^{-9}$ in $Z'$-muon coupling. We also extend previous work on axion-muon couplings by examining the importance of loop-level interactions, as well as performing calculations over a wider range of axion masses. We constrain muon-coupled axions from arbitrarily low masses up to about 200-500 MeV, with bounds extending down to axion-muon couplings of approximately $10^{-8}$ GeV$^{-1}$. We conclude that supernovae broadly provide a sensitive probe of new lightly-coupled particles interacting with muons. |
1701.01761 | P. Q. Hung | P. Q. Hung, Trinh Le, Van Que Tran and Tzu-Chiang Yuan | Muon-to-Electron Conversion in Mirror Fermion Model with Electroweak
Scale Non-Sterile Right-handed Neutrinos | 31 pages, 5 figures | null | 10.1016/j.nuclphysb.2018.05.020 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The muon-to-electron conversion in nuclei like aluminum, titanium and gold is
studied in the context of a class of mirror fermion model with non-sterile
right-handed neutrinos having mass at the electroweak scale. At the limit of
zero momentum transfer and large mirror lepton masses, we derive a simple
formula to relate the conversion rate with the on-shell radiative decay rate of
muon into electron. Current experimental limits (SINDRUM II) and projected
sensitivities (Mu2e, COMET and PRISM) for the muon-to-electron conversion rates
in various nuclei and latest limit from MEG for the radiative decay rate of
muon into electron are used to put constraints on the parameter space of the
model. Depending on the nuclei targets used in different experiments, for the
mirror lepton mass in the range of 100 to 800 GeV, the sensitivities of the new
Yukawa couplings one can probe in the near future are in the range of one tenth
to one hundred-thousandth, depending on the mixing scenarios in the model.
| [
{
"created": "Fri, 6 Jan 2017 21:25:12 GMT",
"version": "v1"
}
] | 2018-08-01 | [
[
"Hung",
"P. Q.",
""
],
[
"Le",
"Trinh",
""
],
[
"Tran",
"Van Que",
""
],
[
"Yuan",
"Tzu-Chiang",
""
]
] | The muon-to-electron conversion in nuclei like aluminum, titanium and gold is studied in the context of a class of mirror fermion model with non-sterile right-handed neutrinos having mass at the electroweak scale. At the limit of zero momentum transfer and large mirror lepton masses, we derive a simple formula to relate the conversion rate with the on-shell radiative decay rate of muon into electron. Current experimental limits (SINDRUM II) and projected sensitivities (Mu2e, COMET and PRISM) for the muon-to-electron conversion rates in various nuclei and latest limit from MEG for the radiative decay rate of muon into electron are used to put constraints on the parameter space of the model. Depending on the nuclei targets used in different experiments, for the mirror lepton mass in the range of 100 to 800 GeV, the sensitivities of the new Yukawa couplings one can probe in the near future are in the range of one tenth to one hundred-thousandth, depending on the mixing scenarios in the model. |
hep-ph/0611370 | Ezequiel Alvarez | Ezequiel Alvarez (Buenos Aires U.) and Alejandro Szynkman (Montreal
U.) | Direct test of time reversal invariance violation in B mesons | 9 pages, no figures. Refined version matching published article in
Modern Physics Letters A | Mod.Phys.Lett.A23:2085-2091,2008 | 10.1142/S021773230802728X | UdeM-GPP-TH-06-153 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter we reinterpret and reanalyze the available data of the B meson
factories showing the existence of direct experimental evidence of time
reversal invariance violation in B mesons. This reinterpretation consists of
using the available observables to define a new observable which, in a model
independent way and without assuming CPT invariance, compares a transition
between a $B^0$ and a here-defined $B_\alpha$-state, with its time reversed
transition. The observable then offers a direct way to probe time reversal
invariance and it is therefore independent of any conclusion obtained from
current experimental information on CP violation and CPT invariance. As far as
the authors are concerned, this is the first direct evidence of time reversal
invariance violation in B mesons and also the first one obtained from decaying
particles whose mean life time difference is negligible.
| [
{
"created": "Wed, 29 Nov 2006 16:03:42 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Aug 2008 21:32:16 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Alvarez",
"Ezequiel",
"",
"Buenos Aires U."
],
[
"Szynkman",
"Alejandro",
"",
"Montreal\n U."
]
] | In this letter we reinterpret and reanalyze the available data of the B meson factories showing the existence of direct experimental evidence of time reversal invariance violation in B mesons. This reinterpretation consists of using the available observables to define a new observable which, in a model independent way and without assuming CPT invariance, compares a transition between a $B^0$ and a here-defined $B_\alpha$-state, with its time reversed transition. The observable then offers a direct way to probe time reversal invariance and it is therefore independent of any conclusion obtained from current experimental information on CP violation and CPT invariance. As far as the authors are concerned, this is the first direct evidence of time reversal invariance violation in B mesons and also the first one obtained from decaying particles whose mean life time difference is negligible. |
hep-ph/0003126 | Hans-Christian Pauli | Hans-Christian Pauli (MPI Kernphysik, Heidelberg) | On the effective light-cone QCD-Hamiltonian | 10 pages, 5 figures, 1 table, 16 references, Latex2e. Proceedings of
the Workshop on Light-Cone QCD and Nonperturbative Hadron Physics December 13
- 22, 1999, National Institute for Theoretical Physics, University of
Adelaide | Nucl.Phys.Proc.Suppl. 90 (2000) 154-160 | null | null | hep-ph | null | Taking the effective interaction between a quark and an anti-quark from
previous work, the dependendence on a regularization scale is removed in line
with the renormalization group. In order to emphasize the essential point, the
full spinor interaction is replaced by a model which includes only the Coulomb
and the hyperfine interaction. By adjusting the effective quark masses, the
only free parameters of the theory, the mass and the size of the pion are
reproduced, as well as the mass of all other pseudo-scalar mesons. Estimates
for the vector mesons are close to the empirical values. The model exposes
screening rather than strict confinement. The ionization thresholds are in
general much larger than the pion mass.
| [
{
"created": "Tue, 14 Mar 2000 14:45:47 GMT",
"version": "v1"
}
] | 2015-07-29 | [
[
"Pauli",
"Hans-Christian",
"",
"MPI Kernphysik, Heidelberg"
]
] | Taking the effective interaction between a quark and an anti-quark from previous work, the dependendence on a regularization scale is removed in line with the renormalization group. In order to emphasize the essential point, the full spinor interaction is replaced by a model which includes only the Coulomb and the hyperfine interaction. By adjusting the effective quark masses, the only free parameters of the theory, the mass and the size of the pion are reproduced, as well as the mass of all other pseudo-scalar mesons. Estimates for the vector mesons are close to the empirical values. The model exposes screening rather than strict confinement. The ionization thresholds are in general much larger than the pion mass. |
1202.4852 | Swatantra Tiwari | S. K. Tiwari, P. K. Srivastava, and C. P. Singh | The effect of flow on Hadronic Spectra in an Excluded-Volume Model | 24 pages, 12 figures, Accepted for publication in Journal of Physics
G: Nuclear and Particle Physics | J. Phys. G : Nucl. Part. Phys. 40, 045102 (2013) | 10.1088/0954-3899/40/4/045102 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, we proposed a thermodynamically consistent excluded-volume model
for the HG fireball and we noticed that our model gives a suitable description
for various properties of multiparticle production and their ratios in the
entire range of temperatures and baryon densities. The aim in this paper is to
obtain the variations of freeze-out volume in a slice of unit rapidity i.e.
$dV/dy$ as well as total volume of the fireball with respect to center-of-mass
energy $(\sqrt{s_{NN}})$ and confront our model calculations with the
corresponding thermal freeze-out volume obtained from the Hanbury-Brown-Twiss
(HBT) pion interferometry method. We also test the validity of our model in
extracting the total multiplicities as well as the central rapidity densities
of various hadrons and comparing them with the recent results. We further
calculate the rapidity as well as transverse momentum spectra of various
particles produced in different heavy-ion collider experiments in order to
examine the role of flow by matching our predictions suitably with the
available experimental results. Finally, we extend our analysis for the
production of light nuclei, hypernuclei and their antinuclei over a broad
energy range from Alternating Gradient Synchrotron (AGS) to Large Hadron
Collider (LHC) energies.
| [
{
"created": "Wed, 22 Feb 2012 08:20:31 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Feb 2013 10:04:46 GMT",
"version": "v2"
}
] | 2013-03-08 | [
[
"Tiwari",
"S. K.",
""
],
[
"Srivastava",
"P. K.",
""
],
[
"Singh",
"C. P.",
""
]
] | Recently, we proposed a thermodynamically consistent excluded-volume model for the HG fireball and we noticed that our model gives a suitable description for various properties of multiparticle production and their ratios in the entire range of temperatures and baryon densities. The aim in this paper is to obtain the variations of freeze-out volume in a slice of unit rapidity i.e. $dV/dy$ as well as total volume of the fireball with respect to center-of-mass energy $(\sqrt{s_{NN}})$ and confront our model calculations with the corresponding thermal freeze-out volume obtained from the Hanbury-Brown-Twiss (HBT) pion interferometry method. We also test the validity of our model in extracting the total multiplicities as well as the central rapidity densities of various hadrons and comparing them with the recent results. We further calculate the rapidity as well as transverse momentum spectra of various particles produced in different heavy-ion collider experiments in order to examine the role of flow by matching our predictions suitably with the available experimental results. Finally, we extend our analysis for the production of light nuclei, hypernuclei and their antinuclei over a broad energy range from Alternating Gradient Synchrotron (AGS) to Large Hadron Collider (LHC) energies. |
2212.05073 | Dawid Brzeminski | Dawid Brzeminski, Saurav Das, Anson Hook and Clayton Ristow | Constraining Vector Dark Matter with Neutrino experiments | 23 pages, 5 figures, updated references | null | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Vector Dark Matter (VDM) that couples to lepton flavor ($L_e$, $L_{\mu}$,
$L_{\tau}$) acts similarly to a chemical potential for the neutrino flavor
eigenstates and modifies neutrino oscillations. VDM imparts unique signatures
such as time and directional dependence with longer baselines giving better
sensitivity. We use the non-observation of such a signal at Super-Kamiokande to
rule out the existence of VDM in a region of parameter space several orders of
magnitude beyond other constraints and show the projected reach of future
experiments such as DUNE.
| [
{
"created": "Fri, 9 Dec 2022 19:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Apr 2023 20:00:28 GMT",
"version": "v2"
},
{
"created": "Wed, 2 Aug 2023 16:18:58 GMT",
"version": "v3"
}
] | 2023-08-03 | [
[
"Brzeminski",
"Dawid",
""
],
[
"Das",
"Saurav",
""
],
[
"Hook",
"Anson",
""
],
[
"Ristow",
"Clayton",
""
]
] | Vector Dark Matter (VDM) that couples to lepton flavor ($L_e$, $L_{\mu}$, $L_{\tau}$) acts similarly to a chemical potential for the neutrino flavor eigenstates and modifies neutrino oscillations. VDM imparts unique signatures such as time and directional dependence with longer baselines giving better sensitivity. We use the non-observation of such a signal at Super-Kamiokande to rule out the existence of VDM in a region of parameter space several orders of magnitude beyond other constraints and show the projected reach of future experiments such as DUNE. |
2306.12961 | Kazunori Nakayama | Kazunori Nakayama, Fuminobu Takahashi, Masaki Yamada | Quantum decay of scalar and vector boson stars and oscillons into
gravitons | 32 pages, 2 figures | null | null | TU-1197, KEK-QUP-2023-0013 | hep-ph astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We point out that a soliton such as an oscillon or boson star inevitably
decays into gravitons through gravitational interactions. These decay processes
exist even if there are no apparent self-interactions of the constituent field,
scalar or vector, since they are induced by gravitational interactions. Hence,
our results provide a strict upper limit on the lifetime of oscillons and boson
stars including the dilute axion star. We also calculate the spectrum of the
graviton background from decay of solitons.
| [
{
"created": "Thu, 22 Jun 2023 15:20:05 GMT",
"version": "v1"
}
] | 2023-06-23 | [
[
"Nakayama",
"Kazunori",
""
],
[
"Takahashi",
"Fuminobu",
""
],
[
"Yamada",
"Masaki",
""
]
] | We point out that a soliton such as an oscillon or boson star inevitably decays into gravitons through gravitational interactions. These decay processes exist even if there are no apparent self-interactions of the constituent field, scalar or vector, since they are induced by gravitational interactions. Hence, our results provide a strict upper limit on the lifetime of oscillons and boson stars including the dilute axion star. We also calculate the spectrum of the graviton background from decay of solitons. |
1103.5156 | Vitaly Beylin | V. Beylin, V. Kuksa, G. Vereshkov | The gauge model of quark--meson interactions and the Higgs status of
scalar mesons | 8 pages, 1 figure | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Electromagnetic and strong hadron processes at low energies are considered in
the renormalizable model with the spontaneously broken $U_0(1)\times U(1)\times
SU(2)$ gauge symmetry. Calculated radiative widths of vector mesons and
effective couplings $g_{VVS}$ agree with the experimental data. Residual Higgs
degrees of freedom are associated with scalar states $a_0(980)$ and $f_0(980)$
with the degeneration in masses. Two-gamma decays of $\pi^0-$ and $\sigma-$
mesons are analyzed in detail. To provide an "infrared confinement" a cutoff
procedure has been also used in calculations.
| [
{
"created": "Sat, 26 Mar 2011 20:12:45 GMT",
"version": "v1"
}
] | 2011-03-29 | [
[
"Beylin",
"V.",
""
],
[
"Kuksa",
"V.",
""
],
[
"Vereshkov",
"G.",
""
]
] | Electromagnetic and strong hadron processes at low energies are considered in the renormalizable model with the spontaneously broken $U_0(1)\times U(1)\times SU(2)$ gauge symmetry. Calculated radiative widths of vector mesons and effective couplings $g_{VVS}$ agree with the experimental data. Residual Higgs degrees of freedom are associated with scalar states $a_0(980)$ and $f_0(980)$ with the degeneration in masses. Two-gamma decays of $\pi^0-$ and $\sigma-$ mesons are analyzed in detail. To provide an "infrared confinement" a cutoff procedure has been also used in calculations. |
1711.02607 | Rafal Staszewski | Rafa{\l} Staszewski, Izabela Babiarz, Antoni Szczurek | Rescattering effects in jet-gap-jet processes | 5 pages, 5 figures, presented at: EDS Blois 2017, Prague, Czech
Republic, June 26-30, 2017 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the process of colour-singlet parton-parton scattering, which in
hadron-hadron collision can lead to production of jet events, where a rapidity
gap between the jets is present. The dynamics of the process is calculated
within LL BFKL approximation. Using Pythia MC generator, hadronic shapes of
jet-gap-jet events are studied, in particular the distributions of the rapidity
gap size resulting from the jet formation processes. Using Pythia's modelling
of multiple parton interactions, the rescattering effects are simulated. It is
shown how these effects influence the gap size distributions. The kinematic
dependence of the gap survival probability is discussed.
| [
{
"created": "Tue, 7 Nov 2017 16:56:38 GMT",
"version": "v1"
}
] | 2017-11-08 | [
[
"Staszewski",
"Rafał",
""
],
[
"Babiarz",
"Izabela",
""
],
[
"Szczurek",
"Antoni",
""
]
] | We discuss the process of colour-singlet parton-parton scattering, which in hadron-hadron collision can lead to production of jet events, where a rapidity gap between the jets is present. The dynamics of the process is calculated within LL BFKL approximation. Using Pythia MC generator, hadronic shapes of jet-gap-jet events are studied, in particular the distributions of the rapidity gap size resulting from the jet formation processes. Using Pythia's modelling of multiple parton interactions, the rescattering effects are simulated. It is shown how these effects influence the gap size distributions. The kinematic dependence of the gap survival probability is discussed. |
0810.4138 | Pavel Fileviez Perez | Pavel Fileviez Perez, Tao Han, Tong Li, Michael J. Ramsey-Musolf | Leptoquarks and Neutrino Masses at the LHC | 46 pages, 52 figures | Nucl.Phys.B819:139-176,2009 | 10.1016/j.nuclphysb.2009.04.009 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The properties of light leptoquarks predicted in the context of a simple
grand unified theory and their observability at the LHC are investigated. The
SU(5) symmetry of the theory implies that the leptoquark couplings to matter
are related to the neutrino mass matrix. We study the resulting connection
between neutrino masses and mixing parameters and the leptoquark decays, and
show that different light neutrino hierarchies imply distinctive leptoquark
decay signatures. We also discuss low-energy constraints implied by searches
for charged lepton flavour violation, studies of meson decays, and electroweak
precision data. We perform a detailed parton-level study of the leptoquark
signals and the Standard Model backgrounds at the LHC. With the clean final
states containing a di-lepton plus two jets, the QCD production of the
leptoquark pair can be observed for a leptoquark mass of one TeV and beyond. By
examining the lepton flavor structure of the observed events, one could further
test the model predictions related to the neutrino mass spectrum. In
particular, b-flavor tagging will be useful in distinguishing the neutrino mass
pattern and possibly probing an unknown Majorana phase in the Inverted
Hierarchy or the Quasi-Degenerate scenario. Electroweak associated production
of the leptoquark doublet can also be useful in identifying the quantum numbers
of the leptoquarks and distinguishing between the neutrino mass spectra, even
though the corresponding event rates are smaller than for QCD production. We
find that with only the clean channel of mu+ E_T jets, one could expect an
observable signal for a leptoquark masses of about 600 GeV or higher.
| [
{
"created": "Wed, 22 Oct 2008 19:34:42 GMT",
"version": "v1"
}
] | 2009-05-28 | [
[
"Perez",
"Pavel Fileviez",
""
],
[
"Han",
"Tao",
""
],
[
"Li",
"Tong",
""
],
[
"Ramsey-Musolf",
"Michael J.",
""
]
] | The properties of light leptoquarks predicted in the context of a simple grand unified theory and their observability at the LHC are investigated. The SU(5) symmetry of the theory implies that the leptoquark couplings to matter are related to the neutrino mass matrix. We study the resulting connection between neutrino masses and mixing parameters and the leptoquark decays, and show that different light neutrino hierarchies imply distinctive leptoquark decay signatures. We also discuss low-energy constraints implied by searches for charged lepton flavour violation, studies of meson decays, and electroweak precision data. We perform a detailed parton-level study of the leptoquark signals and the Standard Model backgrounds at the LHC. With the clean final states containing a di-lepton plus two jets, the QCD production of the leptoquark pair can be observed for a leptoquark mass of one TeV and beyond. By examining the lepton flavor structure of the observed events, one could further test the model predictions related to the neutrino mass spectrum. In particular, b-flavor tagging will be useful in distinguishing the neutrino mass pattern and possibly probing an unknown Majorana phase in the Inverted Hierarchy or the Quasi-Degenerate scenario. Electroweak associated production of the leptoquark doublet can also be useful in identifying the quantum numbers of the leptoquarks and distinguishing between the neutrino mass spectra, even though the corresponding event rates are smaller than for QCD production. We find that with only the clean channel of mu+ E_T jets, one could expect an observable signal for a leptoquark masses of about 600 GeV or higher. |
hep-ph/9909515 | Yi Bing Ding | Yi-Bing Ding, Xue-Qian Li, Pong-Nian Shen | Comment on " a unified scheme for flavored mesons and baryons" | Latex file, 11pages | Eur.Phys.J.A7:107-108,2000 | 10.1007/s100500050017 | null | hep-ph | null | We would comment on the results of the paper "a unified scheme for flavored
mesons and baryons" (P.C.Vinodkumar, J.N.Panandya, V.M.Bannur, and
S.B.Khadkikar Eur. Phys. J. A4(1999)83), and point out some inconsistencies and
mistakes in the work for solving the Dirac equation. In terms of an example for
a single particle we investigate the reliability of the perturbative method for
computing the Coulomb energy and discuss the contribution to the wavefunction
at origin from the Coulomb potential. We conclude that the accuracy of their
numerical results needs to be reconsidered.
| [
{
"created": "Mon, 27 Sep 1999 07:39:44 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Ding",
"Yi-Bing",
""
],
[
"Li",
"Xue-Qian",
""
],
[
"Shen",
"Pong-Nian",
""
]
] | We would comment on the results of the paper "a unified scheme for flavored mesons and baryons" (P.C.Vinodkumar, J.N.Panandya, V.M.Bannur, and S.B.Khadkikar Eur. Phys. J. A4(1999)83), and point out some inconsistencies and mistakes in the work for solving the Dirac equation. In terms of an example for a single particle we investigate the reliability of the perturbative method for computing the Coulomb energy and discuss the contribution to the wavefunction at origin from the Coulomb potential. We conclude that the accuracy of their numerical results needs to be reconsidered. |
hep-ph/0509076 | Andreas Metz | J.C. Collins, A.V. Efremov, K. Goeke, S. Menzel, A. Metz, and P.
Schweitzer | Sivers effect in semi-inclusive deeply inelastic scattering | Small additions, Fig.2 corrected, references and one figure added,
correction in Eq.(13), version accepted for publication | Phys.Rev. D73 (2006) 014021 | 10.1103/PhysRevD.73.014021 | null | hep-ph | null | The Sivers function is extracted from HERMES data on single spin asymmetries
in semi-inclusive deeply inelastic scattering. Our analysis use a simple
Gaussian model for the distribution of transverse parton momenta, together with
the flavor dependence given by the leading 1/Nc approximation and a neglect of
the Sivers antiquark distribution. We find that within the errors of the data
these approximations are sufficient.
| [
{
"created": "Thu, 8 Sep 2005 13:46:38 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Jan 2006 10:30:21 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Collins",
"J. C.",
""
],
[
"Efremov",
"A. V.",
""
],
[
"Goeke",
"K.",
""
],
[
"Menzel",
"S.",
""
],
[
"Metz",
"A.",
""
],
[
"Schweitzer",
"P.",
""
]
] | The Sivers function is extracted from HERMES data on single spin asymmetries in semi-inclusive deeply inelastic scattering. Our analysis use a simple Gaussian model for the distribution of transverse parton momenta, together with the flavor dependence given by the leading 1/Nc approximation and a neglect of the Sivers antiquark distribution. We find that within the errors of the data these approximations are sufficient. |
1807.04066 | Wolfgang Lucha | Wolfgang Lucha | Simplified Bethe-Salpeter Description of Basic Pseudoscalar-Meson
Features | 5 pages, 1 figure, contributed to "QCD@Work 2018 - International
Workshop on Quantum Chromodynamics: Theory and Experiment" (25 - 28 June
2018, Matera, Italy) | EPJ Web of Conferences 192, 00040 (2018) | 10.1051/epjconf/201819200040 | HEPHY-PUB 1000/18 (2018) | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We assess a description of pseudoscalar mesons as pseudo-Goldstone bosons by
its compatibility with some Gell-Mann-Oakes-Renner-type relation.
| [
{
"created": "Wed, 11 Jul 2018 10:56:46 GMT",
"version": "v1"
}
] | 2019-06-03 | [
[
"Lucha",
"Wolfgang",
""
]
] | We assess a description of pseudoscalar mesons as pseudo-Goldstone bosons by its compatibility with some Gell-Mann-Oakes-Renner-type relation. |
hep-ph/0304301 | Mark Strikman | L. Frankfurt (Tel Aviv U.), M. Strikman (Penn State U.) and M.Zhalov
(Petersburg Nuclear Physics Inst.) | Coherent Photoproduction from Nuclei | 33 pages, 12 figs, To appear in the special issue of Acta Physica
Polonica to celebrate the 65th Birthday of Professor Jan Kwiecinski | Acta Phys.Polon.B34:3215-3254,2003 | null | null | hep-ph | null | We argue that study of the cross section of coherent photo(electro)
production of vector mesons off nuclear targets provides an effective method to
probe the leading twist hard QCD regimes of color transparency and perturbative
color opacity as well as the onset of black body limit (BBL) in the soft and
hard QCD interactions. In the case of intermediate energies we use the
Generalized Vector Dominance Model to take into account coherence effects for
two distinctive limits - the soft interactions for production of $\rho$ and
$\rho'$-mesons and the color transparency regime for production of charmonium
states. We demonstrate that GVDM describes very well $\rho$-meson coherent
photoproduction at $6 \leq E_{\gamma} \leq 10$ GeV and predict an oscillating
energy dependence for the coherent charmonium production. In the limit of small
$x$ we find that hard QCD leads to onset of the perturbative color opacity even
for production of very small onium states, like $\Upsilon$. The advantages of
the process of coherent dijet photoproduction and hard diffractive processes in
general for probing the onset of BBL and measuring the light-cone wave function
of the photon in a hard scattering regime where decomposition over twists
becomes inapplicable are explained. We apply this analysis to the study of the
photon induced coherent processes in Ultra Peripheral Collisions of ions at LHC
and demonstrate that the counting rates will be sufficient to study the physics
of color opacity and color transparency at the energies beyond the reach of the
electron-nucleon(nucleus) colliders.
| [
{
"created": "Wed, 30 Apr 2003 18:48:07 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Frankfurt",
"L.",
"",
"Tel Aviv U."
],
[
"Strikman",
"M.",
"",
"Penn State U."
],
[
"Zhalov",
"M.",
"",
"Petersburg Nuclear Physics Inst."
]
] | We argue that study of the cross section of coherent photo(electro) production of vector mesons off nuclear targets provides an effective method to probe the leading twist hard QCD regimes of color transparency and perturbative color opacity as well as the onset of black body limit (BBL) in the soft and hard QCD interactions. In the case of intermediate energies we use the Generalized Vector Dominance Model to take into account coherence effects for two distinctive limits - the soft interactions for production of $\rho$ and $\rho'$-mesons and the color transparency regime for production of charmonium states. We demonstrate that GVDM describes very well $\rho$-meson coherent photoproduction at $6 \leq E_{\gamma} \leq 10$ GeV and predict an oscillating energy dependence for the coherent charmonium production. In the limit of small $x$ we find that hard QCD leads to onset of the perturbative color opacity even for production of very small onium states, like $\Upsilon$. The advantages of the process of coherent dijet photoproduction and hard diffractive processes in general for probing the onset of BBL and measuring the light-cone wave function of the photon in a hard scattering regime where decomposition over twists becomes inapplicable are explained. We apply this analysis to the study of the photon induced coherent processes in Ultra Peripheral Collisions of ions at LHC and demonstrate that the counting rates will be sufficient to study the physics of color opacity and color transparency at the energies beyond the reach of the electron-nucleon(nucleus) colliders. |
2208.13036 | G.R. Boroun | G.R.Boroun | One-to-One correspondence of soft and hard Pomeron with the CDP of the
gluon density at low $x$ | will be appear in JETP Letters | JETP Letters, Vol. 117, No. 4, 247 (2023) | 10.1134/S0021364023600015 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The correspondence between the gluon density behavior of the color dipole
picture and the two-Pomeron approach at low $x$ deep inelastic scattering is
considered. For photon virtualities of $Q^{2}{\gtrsim}10~\mathrm{GeV}^{2}$, the
results for the parametrization and CDP models are defined by the CDP
asymptotic limit and are compatible with the soft and hard-Pomeron approach.
These results show that the hard-Pomeron trajectory does not guarantee
converging towards the asymptotic representation at low and large $Q^{2}$
($Q^{2}{\lesssim}100~\mathrm{GeV}^{2}$) values in a wide range of the
virtual-photon-proton energy squared. The gluon distributions can be obtained
directly in terms of the
proton structure functions and the running coupling and compared with the
results from the GJR and MSTW parametrizations.
| [
{
"created": "Sat, 27 Aug 2022 15:03:18 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Sep 2022 13:28:59 GMT",
"version": "v2"
},
{
"created": "Wed, 4 Jan 2023 13:48:05 GMT",
"version": "v3"
}
] | 2023-03-16 | [
[
"Boroun",
"G. R.",
""
]
] | The correspondence between the gluon density behavior of the color dipole picture and the two-Pomeron approach at low $x$ deep inelastic scattering is considered. For photon virtualities of $Q^{2}{\gtrsim}10~\mathrm{GeV}^{2}$, the results for the parametrization and CDP models are defined by the CDP asymptotic limit and are compatible with the soft and hard-Pomeron approach. These results show that the hard-Pomeron trajectory does not guarantee converging towards the asymptotic representation at low and large $Q^{2}$ ($Q^{2}{\lesssim}100~\mathrm{GeV}^{2}$) values in a wide range of the virtual-photon-proton energy squared. The gluon distributions can be obtained directly in terms of the proton structure functions and the running coupling and compared with the results from the GJR and MSTW parametrizations. |
1703.00244 | Enrico Meggiolaro | M. Giordano, E. Meggiolaro, P.V.R.G. Silva | An investigation on the leading and subleading high-energy behavior of
hadron-hadron total cross sections using a best-fit analysis of hadronic
scattering data | 33 pages, 7 tables, 7 figures | Phys. Rev. D 96, 034015 (2017) | 10.1103/PhysRevD.96.034015 | IFUP-TH/2017 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present investigation we study the leading and subleading high-energy
behavior of hadron-hadron total cross sections using a best-fit analysis of
hadronic scattering data. The parametrization used for the hadron-hadron total
cross sections at high energy is inspired by recent results obtained by
Giordano and Meggiolaro (2014) using a nonperturbative approach in the
framework of QCD and it reads $\sigma_\text{tot} \sim B\ln^2 s + C\ln s\ln\ln
s$. Both $B$ and $C$ are obtained by means of best-fits to data for
proton-proton and antiproton-proton scattering, including recent data obtained
at the LHC, and also to data for other meson-baryon and baryon-baryon
scattering processes. The results are compared to the theoretical predictions
existing in the literature. In particular, following the above-mentioned
nonperturbative QCD approach, we also consider fits where the parameters $B$
and $C$ are set to $B = \kappa B_\text{th}$ and $C = \kappa C_\text{th}$, where
$B_\text{th}$ and $C_\text{th}$ are universal quantities related to the QCD
stable spectrum, while $\kappa$ (treated as an extra free parameter) is related
to the asymptotic value of the ratio $\sigma_\text{el}/\sigma_\text{tot}$.
Different possible scenarios are then considered and compared.
| [
{
"created": "Wed, 1 Mar 2017 11:38:15 GMT",
"version": "v1"
}
] | 2017-08-30 | [
[
"Giordano",
"M.",
""
],
[
"Meggiolaro",
"E.",
""
],
[
"Silva",
"P. V. R. G.",
""
]
] | In the present investigation we study the leading and subleading high-energy behavior of hadron-hadron total cross sections using a best-fit analysis of hadronic scattering data. The parametrization used for the hadron-hadron total cross sections at high energy is inspired by recent results obtained by Giordano and Meggiolaro (2014) using a nonperturbative approach in the framework of QCD and it reads $\sigma_\text{tot} \sim B\ln^2 s + C\ln s\ln\ln s$. Both $B$ and $C$ are obtained by means of best-fits to data for proton-proton and antiproton-proton scattering, including recent data obtained at the LHC, and also to data for other meson-baryon and baryon-baryon scattering processes. The results are compared to the theoretical predictions existing in the literature. In particular, following the above-mentioned nonperturbative QCD approach, we also consider fits where the parameters $B$ and $C$ are set to $B = \kappa B_\text{th}$ and $C = \kappa C_\text{th}$, where $B_\text{th}$ and $C_\text{th}$ are universal quantities related to the QCD stable spectrum, while $\kappa$ (treated as an extra free parameter) is related to the asymptotic value of the ratio $\sigma_\text{el}/\sigma_\text{tot}$. Different possible scenarios are then considered and compared. |
1602.08816 | Zhaofeng Kang | Xiao-Jun Bi, Zhaofeng Kang, P. Ko, Jinmian Li and Tianjun Li | Asymmetric Dark Matter Bound State | PRD version; major revision in terms of the referee's reports;
building a new model to avoid the strong DM direct detection constraint; new
references added | Phys. Rev. D 95, 043540 (2017) | 10.1103/PhysRevD.95.043540 | null | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose an interesting framework for asymmetric scalar dark matter (ADM),
which has novel collider phenomenology in terms of an unstable ADM bound state
(ADMonium) produced via Higgs portals. ADMonium is a natural consequence of the
basic features of ADM: the (complex scalar) ADM is charged under a dark local
$U(1)_d$ symmetry which is broken at a low scale and provides a light gauge
boson $X$. The dark gauge coupling is strong and then ADM can annihilate away
into $X$-pair effectively. Therefore, the ADM can form bound state due to its
large self-interaction via $X$ mediation. To explore the collider signature of
ADMonium, we propose that ADM has a two-Higgs doublet portal. The ADMonium can
have a sizable mixing with the heavier Higgs boson, which admits a large cross
section of ADMonium production associated with $b\bar b$. The resulting
signature at the LHC depends on the decays of $X$. In this paper we consider a
case of particular interest: $pp\ra b\bar b+ {\rm ADMonium}$ followed by ${\rm
ADMonium}\ra 2X\ra 2e^+e^-$ where the electrons are identified as (un)converted
photons. It may provide a competitive explanation to heavy di-photon resonance
searches at the LHC.
| [
{
"created": "Mon, 29 Feb 2016 03:56:34 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Mar 2016 08:49:42 GMT",
"version": "v2"
},
{
"created": "Thu, 29 Jun 2017 13:11:43 GMT",
"version": "v3"
}
] | 2017-06-30 | [
[
"Bi",
"Xiao-Jun",
""
],
[
"Kang",
"Zhaofeng",
""
],
[
"Ko",
"P.",
""
],
[
"Li",
"Jinmian",
""
],
[
"Li",
"Tianjun",
""
]
] | We propose an interesting framework for asymmetric scalar dark matter (ADM), which has novel collider phenomenology in terms of an unstable ADM bound state (ADMonium) produced via Higgs portals. ADMonium is a natural consequence of the basic features of ADM: the (complex scalar) ADM is charged under a dark local $U(1)_d$ symmetry which is broken at a low scale and provides a light gauge boson $X$. The dark gauge coupling is strong and then ADM can annihilate away into $X$-pair effectively. Therefore, the ADM can form bound state due to its large self-interaction via $X$ mediation. To explore the collider signature of ADMonium, we propose that ADM has a two-Higgs doublet portal. The ADMonium can have a sizable mixing with the heavier Higgs boson, which admits a large cross section of ADMonium production associated with $b\bar b$. The resulting signature at the LHC depends on the decays of $X$. In this paper we consider a case of particular interest: $pp\ra b\bar b+ {\rm ADMonium}$ followed by ${\rm ADMonium}\ra 2X\ra 2e^+e^-$ where the electrons are identified as (un)converted photons. It may provide a competitive explanation to heavy di-photon resonance searches at the LHC. |
1809.03128 | Masamichi Ishihara | Masamichi Ishihara | Chiral phase transition within the linear sigma model in the Tsallis
nonextensive statistics based on density operator | 12 pages, 3 figures | International Journal of Modern Physics E Vol. 28, No. 4 (2019)
1950020 (14 pages) | 10.1142/S0218301319500204 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We studied the chiral phase transition for small $|1-q|$ within the Tsallis
nonextensive statistics of the entropic parameter $q$, where the quantity
$|1-q|$ is the measure of the deviation from the Boltzmann-Gibbs statistics. We
adopted the normalized $q$-expectation value in this study. We applied the free
particle approximation and the massless approximation in the calculations of
the expectation values. We estimated the critical physical temperature, and
obtained the chiral condensate, the sigma mass, and the pion mass, as functions
of the physical temperature $T_{\mathrm{ph}}$ for various $q$. We found the
following facts. The $q$-dependence of the critical physical temperature is
$1/\sqrt{q}$. The chiral condensate at $q$ is smaller than that at $q'$ for
$q>q'$. The $q$-dependence of the pion mass and that of the sigma mass reflect
the $q$-dependence of the condensate. The pion mass at $q$ is heavier than that
at $q'$ for $q>q'$. The sigma mass at $q$ is heavier than that at $q'$ for
$q>q'$ at high physical temperature, while the sigma mass at $q$ is lighter
than that at $q'$ for $q>q'$ at low physical temperature. The quantities which
are functions of the physical temperature $T_{\mathrm{ph}}$ and the entropic
parameter $q$ are described by only the effective physical temperature defined
as $\sqrt{q} T_{\mathrm{ph}}$ under the approximations.
| [
{
"created": "Mon, 10 Sep 2018 04:33:40 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Jan 2019 07:28:15 GMT",
"version": "v2"
}
] | 2019-07-04 | [
[
"Ishihara",
"Masamichi",
""
]
] | We studied the chiral phase transition for small $|1-q|$ within the Tsallis nonextensive statistics of the entropic parameter $q$, where the quantity $|1-q|$ is the measure of the deviation from the Boltzmann-Gibbs statistics. We adopted the normalized $q$-expectation value in this study. We applied the free particle approximation and the massless approximation in the calculations of the expectation values. We estimated the critical physical temperature, and obtained the chiral condensate, the sigma mass, and the pion mass, as functions of the physical temperature $T_{\mathrm{ph}}$ for various $q$. We found the following facts. The $q$-dependence of the critical physical temperature is $1/\sqrt{q}$. The chiral condensate at $q$ is smaller than that at $q'$ for $q>q'$. The $q$-dependence of the pion mass and that of the sigma mass reflect the $q$-dependence of the condensate. The pion mass at $q$ is heavier than that at $q'$ for $q>q'$. The sigma mass at $q$ is heavier than that at $q'$ for $q>q'$ at high physical temperature, while the sigma mass at $q$ is lighter than that at $q'$ for $q>q'$ at low physical temperature. The quantities which are functions of the physical temperature $T_{\mathrm{ph}}$ and the entropic parameter $q$ are described by only the effective physical temperature defined as $\sqrt{q} T_{\mathrm{ph}}$ under the approximations. |
0809.0370 | Yin Lin | Yin Lin | Mass hierarchy and flavour mixing from discrete symmetries | Talk given at IFAE 2008, Bologna, Italy, 26-28 March 2008 | Nuovo Cim.B123:883-885,2008 | 10.1393/ncb/i2008-10630-7 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a class of discrete flavour symmetries for leptons based on the
group S(3) and A(4) with an hybrid breaking pattern. The aim is to construct
models in which the same flavon fields producing the mixing pattern are also
responsible for the mass hierarchy.
| [
{
"created": "Tue, 2 Sep 2008 08:24:44 GMT",
"version": "v1"
}
] | 2010-11-11 | [
[
"Lin",
"Yin",
""
]
] | We consider a class of discrete flavour symmetries for leptons based on the group S(3) and A(4) with an hybrid breaking pattern. The aim is to construct models in which the same flavon fields producing the mixing pattern are also responsible for the mass hierarchy. |
2105.07719 | Tania Robens | Tania Robens | Extended scalar sectors at current and future colliders | 6 pages, 3 figures; Contribution to the 2021 QCD session of the 55th
Rencontres de Moriond | null | null | RBI-ThPhys-2021-021 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | After the discovery of a particle that complies with the properties of the
Higgs boson predicted by the Standard Model, particle physics has entered an
exciting era. One important question is whether the scalar sector realized by
Nature indeed corresponds to the one predicted by the SM, or whether the
resonance at 125 GeV is a manifestation of a more extended scalar sector, and
additional scalar states could be observed at current or future collider
facilities.
| [
{
"created": "Mon, 17 May 2021 10:31:47 GMT",
"version": "v1"
}
] | 2021-05-18 | [
[
"Robens",
"Tania",
""
]
] | After the discovery of a particle that complies with the properties of the Higgs boson predicted by the Standard Model, particle physics has entered an exciting era. One important question is whether the scalar sector realized by Nature indeed corresponds to the one predicted by the SM, or whether the resonance at 125 GeV is a manifestation of a more extended scalar sector, and additional scalar states could be observed at current or future collider facilities. |
hep-ph/0607319 | Pietro Santorelli | M. De Vito, P. Santorelli | Semileptonic B decays into even parity charmed mesons | 11 pages, 2 figures | Eur.Phys.J.C48:441-449,2006 | 10.1140/epjc/s10052-006-0045-1 | DSF-2006-21 (Napoli) | hep-ph | null | By using a constituent quark model we compute the form factors relevant to
semileptonic transitions of B mesons into low-lying p-wave charmed mesons. We
evaluate the q^2 dependence of these form factors and compare them with other
model calculations. The Isgur-Wise functions tau(1/2) and tau(3/2) are also
obtained in the heavy quark limit of our results.
| [
{
"created": "Fri, 28 Jul 2006 14:43:33 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"De Vito",
"M.",
""
],
[
"Santorelli",
"P.",
""
]
] | By using a constituent quark model we compute the form factors relevant to semileptonic transitions of B mesons into low-lying p-wave charmed mesons. We evaluate the q^2 dependence of these form factors and compare them with other model calculations. The Isgur-Wise functions tau(1/2) and tau(3/2) are also obtained in the heavy quark limit of our results. |
2309.12079 | Sah Deepak | Deepak Sah and Manoranjan P. Singh | Pair Production in time-dependent Electric field at Finite times | null | null | null | null | hep-ph cond-mat.other hep-th physics.plasm-ph | http://creativecommons.org/licenses/by/4.0/ | We investigate the finite-time behavior of pair production from the vacuum by
a time-dependent Sauter pulsed electric field using the spinor quantum
electrodynamics (QED). In the adiabatic basis, the one-particle distribution
function in momentum space is determined by utilizing the exact analytical
solution of the Dirac equation. By examining the temporal behavior of the
one-particle distribution function and the momentum spectrum of created pairs
in the sub-critical field limit $(E_0 = 0.2E_c)$, we observe oscillatory
patterns in the longitudinal momentum spectrum(LMS) of particles at finite
times. These oscillations arise due to quantum interference effects resulting
from the dynamical tunneling. Furthermore, we derive an approximate and
simplified analytical expression for the distribution function at finite times,
which allows us to explain the origin and behavior of these oscillations.
Additionally, we discuss the role of the vacuum polarization function and its
counter term to the oscillations in LMS vacuum excitation. We also analyse the
transverse momentum spectrum (TMS).
| [
{
"created": "Thu, 21 Sep 2023 13:49:43 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Oct 2023 15:15:16 GMT",
"version": "v2"
},
{
"created": "Fri, 24 May 2024 19:59:06 GMT",
"version": "v3"
}
] | 2024-05-28 | [
[
"Sah",
"Deepak",
""
],
[
"Singh",
"Manoranjan P.",
""
]
] | We investigate the finite-time behavior of pair production from the vacuum by a time-dependent Sauter pulsed electric field using the spinor quantum electrodynamics (QED). In the adiabatic basis, the one-particle distribution function in momentum space is determined by utilizing the exact analytical solution of the Dirac equation. By examining the temporal behavior of the one-particle distribution function and the momentum spectrum of created pairs in the sub-critical field limit $(E_0 = 0.2E_c)$, we observe oscillatory patterns in the longitudinal momentum spectrum(LMS) of particles at finite times. These oscillations arise due to quantum interference effects resulting from the dynamical tunneling. Furthermore, we derive an approximate and simplified analytical expression for the distribution function at finite times, which allows us to explain the origin and behavior of these oscillations. Additionally, we discuss the role of the vacuum polarization function and its counter term to the oscillations in LMS vacuum excitation. We also analyse the transverse momentum spectrum (TMS). |
1204.3992 | Jan-e Alam Dr. | Trambak Bhattacharyya and Jan-e Alam | Dead cone due to parton virtuality | null | Int. J. Mod. Phys. A, 28 (2013) 1350031 | 10.1142/S0217751X13500310 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A general expression for the dead cone of gluons radiated by virtual partons
has been derived. The conventional dead cone for massive on-shell quarks and
the dead cone for the massless virtual partons have been obtained by using
different limits of the general expression. Radiative suppression due to the
virtuality of initial parton jets in Heavy-Ion Collisions (HIC) has been
discussed. It is observed that the suppression caused by the high virtuality is
overwhelmingly large as compared to that on account of conventional dead-cone
of heavy quarks. The dead cone due to virtuality may play a crucial role in
explaining the observed similar suppression patterns of light and heavy quarks
jets in heavy ion collisions at Relativistic Heavy Ion Collider (RHIC).
| [
{
"created": "Wed, 18 Apr 2012 06:51:15 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Bhattacharyya",
"Trambak",
""
],
[
"Alam",
"Jan-e",
""
]
] | A general expression for the dead cone of gluons radiated by virtual partons has been derived. The conventional dead cone for massive on-shell quarks and the dead cone for the massless virtual partons have been obtained by using different limits of the general expression. Radiative suppression due to the virtuality of initial parton jets in Heavy-Ion Collisions (HIC) has been discussed. It is observed that the suppression caused by the high virtuality is overwhelmingly large as compared to that on account of conventional dead-cone of heavy quarks. The dead cone due to virtuality may play a crucial role in explaining the observed similar suppression patterns of light and heavy quarks jets in heavy ion collisions at Relativistic Heavy Ion Collider (RHIC). |
1008.3116 | Stefano Nicotri | Pietro Colangelo, Floriana Giannuzzi, Stefano Nicotri | Holography, Heavy-Quark Free Energy, and the QCD Phase Diagram | 4 pages, 5 figures, version published on PRD | Phys.Rev.D83:035015,2011 | 10.1103/PhysRevD.83.035015 | BARI-TH/629-2010, DCPT/10/138, IPPP/10/69 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use gauge/string duality to investigate the free energy of two static
color sources (a heavy quark-antiquark pair) in a Yang-Mills theory in strongly
interacting matter, varying temperature and chemical potential. The dual space
geometry is Anti-de Sitter with a charged black-hole to describe finite
temperature and density in the boundary theory, and we also include a
background dilaton field to generate confinement. The resulting phase diagram
in the chemical potential-temperature $\mu-T$ plane is in a quite good
agreement with lattice results and effective models of QCD.
| [
{
"created": "Wed, 18 Aug 2010 15:39:52 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Mar 2011 12:14:26 GMT",
"version": "v2"
}
] | 2011-03-23 | [
[
"Colangelo",
"Pietro",
""
],
[
"Giannuzzi",
"Floriana",
""
],
[
"Nicotri",
"Stefano",
""
]
] | We use gauge/string duality to investigate the free energy of two static color sources (a heavy quark-antiquark pair) in a Yang-Mills theory in strongly interacting matter, varying temperature and chemical potential. The dual space geometry is Anti-de Sitter with a charged black-hole to describe finite temperature and density in the boundary theory, and we also include a background dilaton field to generate confinement. The resulting phase diagram in the chemical potential-temperature $\mu-T$ plane is in a quite good agreement with lattice results and effective models of QCD. |
1912.02720 | Victor Goncalves | V. P. Goncalves, R. Palota da Silva | Exclusive and diffractive quarkonium -- pair production at the LHC and
FCC | 7 pages, 3 figures, 2 tables | Phys. Rev. D 101, 034025 (2020) | 10.1103/PhysRevD.101.034025 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The production of a quarkonium -- pair in exclusive and diffractive processes
in $pp$ collisions at the LHC and FCC energies is investigated. We consider the
$J/\Psi J/\Psi$ and $\Upsilon \Upsilon$ production in these processes and
present predictions for the transverse momentum and rapidity distributions
considering the kinematical ranges expected to be covered by central and
forward detectors. Results for the cross sections are also presented. Our
results indicate that the double $J/\Psi$ production is dominated by the
exclusive process, while the double $\Upsilon$ production receive a large
contribution of the diffractive process. The impact of the modelling of the gap
survival factor on our predictions is discussed.
| [
{
"created": "Thu, 5 Dec 2019 16:57:14 GMT",
"version": "v1"
}
] | 2020-02-26 | [
[
"Goncalves",
"V. P.",
""
],
[
"da Silva",
"R. Palota",
""
]
] | The production of a quarkonium -- pair in exclusive and diffractive processes in $pp$ collisions at the LHC and FCC energies is investigated. We consider the $J/\Psi J/\Psi$ and $\Upsilon \Upsilon$ production in these processes and present predictions for the transverse momentum and rapidity distributions considering the kinematical ranges expected to be covered by central and forward detectors. Results for the cross sections are also presented. Our results indicate that the double $J/\Psi$ production is dominated by the exclusive process, while the double $\Upsilon$ production receive a large contribution of the diffractive process. The impact of the modelling of the gap survival factor on our predictions is discussed. |
1701.00491 | Marco Chianese Mr | F. Buccella, M. Chianese, G. Mangano, G. Miele, S. Morisi and P.
Santorelli | A neutrino mass-mixing sum rule from SO(10) and neutrinoless double beta
decay | 5 pages, 2 figures. Version published in JEHP | JHEP 1704 (2017) 004 | 10.1007/JHEP04(2017)004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Minimal SO(10) grand unified models provide phenomenological predictions for
neutrino mass patterns and mixing. These are the outcome of the interplay of
several features, namely: i) the seesaw mechanism; ii) the presence of an
intermediate scale where B-L gauge symmetry is broken and the right-handed
neutrinos acquire a Majorana mass; iii) a symmetric Dirac neutrino mass matrix
whose pattern is close to the up-type quark one. In this framework two natural
characteristics emerge. Normal neutrino mass hierarchy is the only allowed, and
there is an approximate relation involving both light-neutrino masses and
mixing parameters. This differs from what occurring when horizontal flavour
symmetries are invoked. In this case, in fact, neutrino mixing or mass
relations have been separately obtained in literature. In this paper we discuss
an example of such comprehensive mixing-mass relation in a specific realization
of SO(10) and, in particular, analyse its impact on the expected neutrinoless
double beta decay effective mass parameter $\langle m_{ee} \rangle$, and on the
neutrino mass scale. Remarkably a lower limit for the lightest neutrino mass is
obtained ($m_{\rm lightest} \gtrsim 7.5 \times 10^{-4}$ eV, at 3 $\sigma$
level).
| [
{
"created": "Mon, 2 Jan 2017 19:00:03 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Jan 2017 14:45:41 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Apr 2017 12:26:43 GMT",
"version": "v3"
}
] | 2017-04-10 | [
[
"Buccella",
"F.",
""
],
[
"Chianese",
"M.",
""
],
[
"Mangano",
"G.",
""
],
[
"Miele",
"G.",
""
],
[
"Morisi",
"S.",
""
],
[
"Santorelli",
"P.",
""
]
] | Minimal SO(10) grand unified models provide phenomenological predictions for neutrino mass patterns and mixing. These are the outcome of the interplay of several features, namely: i) the seesaw mechanism; ii) the presence of an intermediate scale where B-L gauge symmetry is broken and the right-handed neutrinos acquire a Majorana mass; iii) a symmetric Dirac neutrino mass matrix whose pattern is close to the up-type quark one. In this framework two natural characteristics emerge. Normal neutrino mass hierarchy is the only allowed, and there is an approximate relation involving both light-neutrino masses and mixing parameters. This differs from what occurring when horizontal flavour symmetries are invoked. In this case, in fact, neutrino mixing or mass relations have been separately obtained in literature. In this paper we discuss an example of such comprehensive mixing-mass relation in a specific realization of SO(10) and, in particular, analyse its impact on the expected neutrinoless double beta decay effective mass parameter $\langle m_{ee} \rangle$, and on the neutrino mass scale. Remarkably a lower limit for the lightest neutrino mass is obtained ($m_{\rm lightest} \gtrsim 7.5 \times 10^{-4}$ eV, at 3 $\sigma$ level). |
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