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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9402321
|
shunzo Kumano
|
S. Kumano
|
Nuclear Shadowing in a Parton Recombination Model: Q$^2$ Variation
|
LATEX 5 pages (Figs. 1-3 are available upon request), SAGA-HE-56-94
|
Phys.Rev.C50:1247-1248,1994
|
10.1103/PhysRevC.50.1247
| null |
hep-ph nucl-th
| null |
Q$^2$ variation of the nuclear-structure-function ratio
$F_2^A(x,Q^2)/F_2^D(x,Q^2)$ is investigated in a parton model with
Q$^2$-rescaling and parton-recombination effects. Calculated results are
compared with the NMC (New Muon Collaboration) and the Fermilab-E665
experimental data. We find that our theoretical results show small Q$^2$
variations and that they are consistent with the data within present
experimental accuracy.
|
[
{
"created": "Sat, 19 Feb 1994 02:08:18 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Kumano",
"S.",
""
]
] |
Q$^2$ variation of the nuclear-structure-function ratio $F_2^A(x,Q^2)/F_2^D(x,Q^2)$ is investigated in a parton model with Q$^2$-rescaling and parton-recombination effects. Calculated results are compared with the NMC (New Muon Collaboration) and the Fermilab-E665 experimental data. We find that our theoretical results show small Q$^2$ variations and that they are consistent with the data within present experimental accuracy.
|
2207.07636
|
Min-Di Zheng
|
Min-Di Zheng, Feng-Zhi Chen and Hong-Hao Zhang
|
Explaining anomalies of $B$-physics, muon $g-2$ and $W$ mass in
$R$-parity violating MSSM with seesaw mechanism
|
34 pages, 2 figures; More discussions and references added, final
version published in EPJC
| null |
10.1140/epjc/s10052-022-10822-y
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The recent experimental results including $R_{K^{(\ast)}}$, $R_{D^{(\ast)}}$,
$(g-2)_\mu$ and $W$ mass show deviations from the standard model (SM)
predictions, implying the clues of new physics (NP). In this work, we
investigate the explanations of these anomalies in the $R$-parity violating
minimal supersymmetric standard model (RPV-MSSM) extended with the inverse
seesaw mechanism. The non-unitarity extent $\eta_{ee}$ and the loop corrections
from the interaction $\lambda'\hat L \hat Q \hat D$ are utilized to raise the
prediction of $W$ mass through muon decays. We also find that the interaction
$\lambda'\hat L \hat Q \hat D$ involved with right-handed (RH)/singlet
(s)neutrinos can explain the $R_{K^{(\ast)}}$ and $R_{D^{(\ast)}}$ anomalies
simultaneously when considering nonzero $\lambda'_{1jk}$. For nonzero
$\lambda'_{2jk}$, this model fulfills the whole $b\to s\ell^+\ell^-$ fit but
cannot be accordant with $R_{D^{(\ast)}}$ measurements. The explanations in
both cases are also favored by $(g-2)_\mu$ data, neutrino oscillation data and
the relevant constraints we scrutinized. Furthermore, this model framework can
be tested in future experiments covering, e.g., the predicted lepton flavor
violations (LFV) at Belle II and the Future Circular Collider with $e^+e^-$
beams (FCC-ee), as well as the heavy neutrinos at future colliders.
|
[
{
"created": "Fri, 15 Jul 2022 17:51:39 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Oct 2022 07:35:25 GMT",
"version": "v2"
}
] |
2022-10-12
|
[
[
"Zheng",
"Min-Di",
""
],
[
"Chen",
"Feng-Zhi",
""
],
[
"Zhang",
"Hong-Hao",
""
]
] |
The recent experimental results including $R_{K^{(\ast)}}$, $R_{D^{(\ast)}}$, $(g-2)_\mu$ and $W$ mass show deviations from the standard model (SM) predictions, implying the clues of new physics (NP). In this work, we investigate the explanations of these anomalies in the $R$-parity violating minimal supersymmetric standard model (RPV-MSSM) extended with the inverse seesaw mechanism. The non-unitarity extent $\eta_{ee}$ and the loop corrections from the interaction $\lambda'\hat L \hat Q \hat D$ are utilized to raise the prediction of $W$ mass through muon decays. We also find that the interaction $\lambda'\hat L \hat Q \hat D$ involved with right-handed (RH)/singlet (s)neutrinos can explain the $R_{K^{(\ast)}}$ and $R_{D^{(\ast)}}$ anomalies simultaneously when considering nonzero $\lambda'_{1jk}$. For nonzero $\lambda'_{2jk}$, this model fulfills the whole $b\to s\ell^+\ell^-$ fit but cannot be accordant with $R_{D^{(\ast)}}$ measurements. The explanations in both cases are also favored by $(g-2)_\mu$ data, neutrino oscillation data and the relevant constraints we scrutinized. Furthermore, this model framework can be tested in future experiments covering, e.g., the predicted lepton flavor violations (LFV) at Belle II and the Future Circular Collider with $e^+e^-$ beams (FCC-ee), as well as the heavy neutrinos at future colliders.
|
hep-ph/9205230
| null |
Eugeni Akhmedov, Zurab Berezhiani and Goran Senjanovic
|
Planck-Scale Physics and Neutrino Masses
|
10 pages, IC/92/79, SISSA-83/92/EP, LMU-04/92 (the preprint number
has been corrected; no other changes)
|
Phys.Rev.Lett.69:3013-3016,1992
|
10.1103/PhysRevLett.69.3013
| null |
hep-ph
| null |
We discuss gravitationally induced masses and mass splittings of Majorana,
Zeldovich-Konopinski-Mahmoud and Dirac neutrinos. Among other implications,
these effects can provide a solution of the solar neutrino puzzle. In
particular, we show how this may work in the 17 keV neutrino picture.
|
[
{
"created": "Fri, 22 May 1992 09:10:32 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Jun 1992 14:07:29 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Akhmedov",
"Eugeni",
""
],
[
"Berezhiani",
"Zurab",
""
],
[
"Senjanovic",
"Goran",
""
]
] |
We discuss gravitationally induced masses and mass splittings of Majorana, Zeldovich-Konopinski-Mahmoud and Dirac neutrinos. Among other implications, these effects can provide a solution of the solar neutrino puzzle. In particular, we show how this may work in the 17 keV neutrino picture.
|
hep-ph/0112013
|
Konstantin Matchev
|
M. Battaglia, A. De Roeck, J. Ellis, F. Gianotti, K.T. Matchev, K.A.
Olive, L. Pape, G. Wilson
|
Post-LEP CMSSM Benchmarks for Supersymmetry
|
6 pages, 2 figures, uses RevTeX4 and BibTeX, contribution to Snowmass
2001
|
eConf C010630:P347,2001
| null |
CERN-TH/2001-340, UMN-TH-2034/01, TPI-MINN-01/53, Snowmass P3-47
|
hep-ph hep-ex
| null |
We introduce a set of CMSSM benchmark scenarios that take into account the
constraints from LEP, Tevatron, $b \to s \gamma$, $g_\mu - 2$ and cosmology.
The benchmark points are chosen to span the range of different generic
possibilities, including focus-point models, points where coannihilation
effects on the relic density are important, and points with rapid relic
annihilation via direct-channel Higgs poles, as well as points with smaller
sparticle masses. We make initial estimates of the physics reaches of different
accelerators, including the LHC, and $e^+ e^-$ colliders in the sub- and
multi-TeV ranges. We stress the complementarity of hadron and lepton colliders,
with the latter favoured for non-strongly-interacting particles and precision
measurements.
|
[
{
"created": "Sun, 2 Dec 2001 17:33:57 GMT",
"version": "v1"
}
] |
2009-09-11
|
[
[
"Battaglia",
"M.",
""
],
[
"De Roeck",
"A.",
""
],
[
"Ellis",
"J.",
""
],
[
"Gianotti",
"F.",
""
],
[
"Matchev",
"K. T.",
""
],
[
"Olive",
"K. A.",
""
],
[
"Pape",
"L.",
""
],
[
"Wilson",
"G.",
""
]
] |
We introduce a set of CMSSM benchmark scenarios that take into account the constraints from LEP, Tevatron, $b \to s \gamma$, $g_\mu - 2$ and cosmology. The benchmark points are chosen to span the range of different generic possibilities, including focus-point models, points where coannihilation effects on the relic density are important, and points with rapid relic annihilation via direct-channel Higgs poles, as well as points with smaller sparticle masses. We make initial estimates of the physics reaches of different accelerators, including the LHC, and $e^+ e^-$ colliders in the sub- and multi-TeV ranges. We stress the complementarity of hadron and lepton colliders, with the latter favoured for non-strongly-interacting particles and precision measurements.
|
2212.09783
|
Andrea Olzi
|
Francesco Bigazzi, Aldo L. Cotrone, Andrea Olzi
|
Axionic Strings, Domain Walls and Baryons
|
Minor changes from the first version, matching the version published
in PRD
|
Phys.Rev.D 108 (2023) 2, 026019
|
10.1103/PhysRevD.108.026019
| null |
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
When axionic strings carry a global charge, domain walls bounded by such
strings may not be allowed to decay completely. This happens in particular in
some models where a composite axion-like particle is the pseudo-Nambu-Goldstone
boson of chiral symmetry breaking of an extra quark flavor. In this case the
global symmetry is the extra flavor baryonic symmetry. The corresponding
axionic domain walls can carry a baryonic charge: they represent the low energy
description of the baryons made by the extra quark flavor. Basic properties of
these particles, such as spin, mass scale, size are discussed. The
corresponding charged axionic strings are explicitly constructed and studied in
a specific calculable model.
|
[
{
"created": "Mon, 19 Dec 2022 19:00:06 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Aug 2023 09:00:07 GMT",
"version": "v2"
}
] |
2023-08-14
|
[
[
"Bigazzi",
"Francesco",
""
],
[
"Cotrone",
"Aldo L.",
""
],
[
"Olzi",
"Andrea",
""
]
] |
When axionic strings carry a global charge, domain walls bounded by such strings may not be allowed to decay completely. This happens in particular in some models where a composite axion-like particle is the pseudo-Nambu-Goldstone boson of chiral symmetry breaking of an extra quark flavor. In this case the global symmetry is the extra flavor baryonic symmetry. The corresponding axionic domain walls can carry a baryonic charge: they represent the low energy description of the baryons made by the extra quark flavor. Basic properties of these particles, such as spin, mass scale, size are discussed. The corresponding charged axionic strings are explicitly constructed and studied in a specific calculable model.
|
hep-ph/9708281
|
Mark Hindmarsh
|
Mark Hindmarsh and Photis Moulatsiotis (Sussex)
|
Constraints on Variant Axion Models
|
21pp RevTeX, 1 eps fig, uses graphics style, typo corrected, and
corrected file sent this time. To appear in Physical Review D
|
Phys. Rev. D 56, 8074 (1997)
|
10.1103/PhysRevD.56.8074
|
SUSX-TH-97-014
|
hep-ph astro-ph
| null |
A particular class of variant axion models with two higgs doublets and a
singlet is studied. In these models the axion couples either to the $u$-quark
or $t$-quark or both, but not to $b$, $c$, $s$, or $d$. When the axion couples
to only one quark the models possess the desirable feature of having no domain
wall problem, which makes them viable candidates for a cosmological axion
string scenario. We calculate the axion couplings to leptons, photons and
nucleons, and the astrophysical constraints on the axion decay constant $v_a$
are investigated and compared to the DFSZ axion model. We find that the most
restrictive lower bound on $v_a$, that from SN1987a, is lowered by up to a
factor of about 30, depending on the model and also the ratio of the vacuum
expectation values of the higgs doublets. For scenarios with axionic strings,
the allowed window for $v_a$ in the $u$ quark model can be more than two orders
of magnitude. For inflationary scenarios, the cosmological upper bound on
$v_a/N$, where $N$ is the QCD anomaly factor, is unaffected: however, the
variant models have $N$ either 3 or 6 times smaller than the DFSZ model.
|
[
{
"created": "Thu, 7 Aug 1997 15:49:01 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Dec 1997 17:26:11 GMT",
"version": "v2"
},
{
"created": "Wed, 10 Dec 1997 17:22:39 GMT",
"version": "v3"
}
] |
2016-08-25
|
[
[
"Hindmarsh",
"Mark",
"",
"Sussex"
],
[
"Moulatsiotis",
"Photis",
"",
"Sussex"
]
] |
A particular class of variant axion models with two higgs doublets and a singlet is studied. In these models the axion couples either to the $u$-quark or $t$-quark or both, but not to $b$, $c$, $s$, or $d$. When the axion couples to only one quark the models possess the desirable feature of having no domain wall problem, which makes them viable candidates for a cosmological axion string scenario. We calculate the axion couplings to leptons, photons and nucleons, and the astrophysical constraints on the axion decay constant $v_a$ are investigated and compared to the DFSZ axion model. We find that the most restrictive lower bound on $v_a$, that from SN1987a, is lowered by up to a factor of about 30, depending on the model and also the ratio of the vacuum expectation values of the higgs doublets. For scenarios with axionic strings, the allowed window for $v_a$ in the $u$ quark model can be more than two orders of magnitude. For inflationary scenarios, the cosmological upper bound on $v_a/N$, where $N$ is the QCD anomaly factor, is unaffected: however, the variant models have $N$ either 3 or 6 times smaller than the DFSZ model.
|
2203.01945
|
Ahmed Ayad
|
Ahmed Ayad
|
Phenomenological Aspects of Axion-Like Particles in Cosmology and
Astrophysics
|
PhD thesis, University of the Witwatersrand
| null | null | null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Cosmology and particle physics are closer today than ever before, with
several searches underway at the interface between cosmology, particle physics,
and field theory. The mystery of dark matter (DM) is one of the greatest common
unsolved problems between these fields. It is established now based on many
astrophysical and cosmological observations that only a small fraction of the
total matter content of the universe is made of baryonic matter, while the vast
majority is constituted by dark matter. However, the nature of such a component
is still unknown. One theoretically well-motivated approach to understanding
the nature of dark matter would be through looking for light pseudo-scalar
candidates for dark matter such as axions and axion-like particles (ALPs).
Axions are hypothetical elementary particles resulting from the Peccei-Quinn
(PQ) solution to the strong CP (charge-parity) problem in quantum
chromodynamics (QCD). Furthermore, many theoretically well-motivated extensions
to the standard model of particle physics (SMPP) predicted the existence of
more pseudo-scalar particles similar to the QCD axion and called ALPs. Axions
and ALPs are characterized by their coupling with two photons. While the
coupling parameter for axions is related to the axion mass, there is no direct
relation between the coupling parameter and the mass of ALPs. Nevertheless, it
is expected that ALPs share the same phenomenology of axions. In the past
years, axions and ALPs regained popularity and slowly became one of the most
appealing candidates that possibly contribute to the dark matter density of the
universe. In this thesis, we focus on studying the phenomenology of axions and
ALPs interactions with photons to constrain some of their properties.
|
[
{
"created": "Thu, 3 Mar 2022 15:41:17 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Mar 2022 10:39:52 GMT",
"version": "v2"
}
] |
2022-03-14
|
[
[
"Ayad",
"Ahmed",
""
]
] |
Cosmology and particle physics are closer today than ever before, with several searches underway at the interface between cosmology, particle physics, and field theory. The mystery of dark matter (DM) is one of the greatest common unsolved problems between these fields. It is established now based on many astrophysical and cosmological observations that only a small fraction of the total matter content of the universe is made of baryonic matter, while the vast majority is constituted by dark matter. However, the nature of such a component is still unknown. One theoretically well-motivated approach to understanding the nature of dark matter would be through looking for light pseudo-scalar candidates for dark matter such as axions and axion-like particles (ALPs). Axions are hypothetical elementary particles resulting from the Peccei-Quinn (PQ) solution to the strong CP (charge-parity) problem in quantum chromodynamics (QCD). Furthermore, many theoretically well-motivated extensions to the standard model of particle physics (SMPP) predicted the existence of more pseudo-scalar particles similar to the QCD axion and called ALPs. Axions and ALPs are characterized by their coupling with two photons. While the coupling parameter for axions is related to the axion mass, there is no direct relation between the coupling parameter and the mass of ALPs. Nevertheless, it is expected that ALPs share the same phenomenology of axions. In the past years, axions and ALPs regained popularity and slowly became one of the most appealing candidates that possibly contribute to the dark matter density of the universe. In this thesis, we focus on studying the phenomenology of axions and ALPs interactions with photons to constrain some of their properties.
|
1110.5582
|
S. Bhattacharyya
|
P. Guptaroy, Goutam Sau and S. Bhattacharyya
|
Ansatzs, Assumptions and Production of J/$\Psi$-Particles: A
Non-`Charmed' Approach vs. the `Charmed' Ones
|
8 pages, 7 figures
|
Chin. Phys. Lett. Vol. 29 No. 2 (2012) 022501
|
10.1088/0256-307X/29/2/022501
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We would attempt, in this work, at dwelling upon some crucial aspects of
$J/\Psi$-production in a few high energy nuclear collisions in the light of a
non-standard model which is outlined in the text. The underlying physical
ideas, assumptions and ansatzs have also been enunciated in some detail. It is
found that the results arrived at with this main working approach here are
fairly in good agreement with both the measured data and the results obtained
on the basis of some other models of the `standard' variety. Impact and
implications of this comparative study have also been precisely highlighted in
the end.
|
[
{
"created": "Tue, 25 Oct 2011 17:09:31 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Mar 2012 13:26:33 GMT",
"version": "v2"
}
] |
2012-04-02
|
[
[
"Guptaroy",
"P.",
""
],
[
"Sau",
"Goutam",
""
],
[
"Bhattacharyya",
"S.",
""
]
] |
We would attempt, in this work, at dwelling upon some crucial aspects of $J/\Psi$-production in a few high energy nuclear collisions in the light of a non-standard model which is outlined in the text. The underlying physical ideas, assumptions and ansatzs have also been enunciated in some detail. It is found that the results arrived at with this main working approach here are fairly in good agreement with both the measured data and the results obtained on the basis of some other models of the `standard' variety. Impact and implications of this comparative study have also been precisely highlighted in the end.
|
hep-ph/0012312
|
Jose Bernabeu
|
J. Bernabeu
|
Neutrinos
|
23 pages, 9 Figures, Lectures XXVIII International Meeting on
Fundamental Physics, Sanlucar, February 2000
| null | null |
FTUV-001122
|
hep-ph
| null |
In these lectures the following topics are considered: historical remarks and
general properties, Dirac and Majorana neutrino masses, effective lagrangian
approach, the seesaw mechanism, the number of active left-hauded neutrino
species, the light neutrino mass matrix, the direct measurement of neutrino
masses, double beta decay, neutrino oscillations in vacuum and neutrino
oscillations in matter.
|
[
{
"created": "Fri, 22 Dec 2000 16:24:44 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Bernabeu",
"J.",
""
]
] |
In these lectures the following topics are considered: historical remarks and general properties, Dirac and Majorana neutrino masses, effective lagrangian approach, the seesaw mechanism, the number of active left-hauded neutrino species, the light neutrino mass matrix, the direct measurement of neutrino masses, double beta decay, neutrino oscillations in vacuum and neutrino oscillations in matter.
|
hep-ph/0404103
|
Sandhya Choubey
|
Sandhya Choubey, S.T. Petcov
|
Reactor Anti-Neutrino Oscillations and Gadolinium Loaded
Super-Kamiokande Detector
|
Includes Addendum with a brief discussion of the implications of the
766.3 kTy KamLAND spectrum data on the sensitivity of the SK-Gd experiment;
two new figures added in the Addendum; typos in Table 1 corrected
|
Phys.Lett. B594 (2004) 333-346
|
10.1016/j.physletb.2004.05.046
|
SISSA 26/2004/EP
|
hep-ph astro-ph hep-ex
| null |
We explore the potential of measuring the solar neutrino oscillation
parameters in the proposed gadolinium loaded Super-Kamiokande (SK-Gd) detector.
Gadolinium dissolved in water can detect neutrons much more efficiently than
pure water. This imparts the detector the ability to observe electron type
antineutrinos, transforming Super-Kamiokande into a huge reactor antineutrino
detector with an event rate approximately 43 times higher than that observed in
KamLAND. We simulate the reactor antineutrino data expected in this high
statistics detector. We use these prospective data to study the precision with
which the solar neutrino oscillation parameters, $\Delta m^2_{\odot}$ and
$\sin^2\theta_{\odot}$, can be determined i) with the SK-Gd detector, and ii)
by combining the SK-Gd data with the global data on solar neutrino
oscillations. For comparison and completeness the allowed regions of $\Delta
m^2_{\odot}$ and $\sin^2\theta_{\odot}$, expected to be obtained from the data
of the solar neutrino and KamLAND experiments, are also presented.
|
[
{
"created": "Mon, 12 Apr 2004 11:15:43 GMT",
"version": "v1"
},
{
"created": "Tue, 18 May 2004 14:19:08 GMT",
"version": "v2"
},
{
"created": "Fri, 13 Aug 2004 16:24:07 GMT",
"version": "v3"
}
] |
2010-04-05
|
[
[
"Choubey",
"Sandhya",
""
],
[
"Petcov",
"S. T.",
""
]
] |
We explore the potential of measuring the solar neutrino oscillation parameters in the proposed gadolinium loaded Super-Kamiokande (SK-Gd) detector. Gadolinium dissolved in water can detect neutrons much more efficiently than pure water. This imparts the detector the ability to observe electron type antineutrinos, transforming Super-Kamiokande into a huge reactor antineutrino detector with an event rate approximately 43 times higher than that observed in KamLAND. We simulate the reactor antineutrino data expected in this high statistics detector. We use these prospective data to study the precision with which the solar neutrino oscillation parameters, $\Delta m^2_{\odot}$ and $\sin^2\theta_{\odot}$, can be determined i) with the SK-Gd detector, and ii) by combining the SK-Gd data with the global data on solar neutrino oscillations. For comparison and completeness the allowed regions of $\Delta m^2_{\odot}$ and $\sin^2\theta_{\odot}$, expected to be obtained from the data of the solar neutrino and KamLAND experiments, are also presented.
|
hep-ph/0701255
|
Zhun Lu
|
Zhun Lu, Bo-Qiang Ma, Ivan Schmidt
|
Transverse spin effects of sea quarks in unpolarized nucleons
|
7 pages, 5 figures, to appear in Physical Review D
|
Phys.Rev.D75:014026,2007
|
10.1103/PhysRevD.75.014026
| null |
hep-ph
| null |
We calculate the non-zero Boer-Mulders functions of sea quarks inside the
proton in a meson-baryon fluctuation model. The results show that the
transverse spin effects of sea quarks in an unpolarized nucleon are sizable.
Using the obtained antiquark Boer-Mulders functions, we estimate the $\cos 2
\phi$ asymmetries in the unpolarized $pp$ and $p D$ Drell-Yan processes at FNAL
E866/NuSea experiments. The prediction for the $\cos 2 \phi$ asymmetries in the
unpolarized $pp$ Drell-Yan process at the BNL Relativistic Heavy Ion Collider
(RHIC) is also given.
|
[
{
"created": "Tue, 30 Jan 2007 19:31:56 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Lu",
"Zhun",
""
],
[
"Ma",
"Bo-Qiang",
""
],
[
"Schmidt",
"Ivan",
""
]
] |
We calculate the non-zero Boer-Mulders functions of sea quarks inside the proton in a meson-baryon fluctuation model. The results show that the transverse spin effects of sea quarks in an unpolarized nucleon are sizable. Using the obtained antiquark Boer-Mulders functions, we estimate the $\cos 2 \phi$ asymmetries in the unpolarized $pp$ and $p D$ Drell-Yan processes at FNAL E866/NuSea experiments. The prediction for the $\cos 2 \phi$ asymmetries in the unpolarized $pp$ Drell-Yan process at the BNL Relativistic Heavy Ion Collider (RHIC) is also given.
|
hep-ph/9905506
|
Paolo Lipari
|
Paolo Lipari
|
The primary protons and the atmospheric neutrino fluxes
|
30 pages, 15 figures. Talk given at the 8th International Workshop on
"Neutrino Telescopes". Venezia, february 1999
| null | null | null |
hep-ph
| null |
The predictions of the atmospheric nu event rates are affected by significant
uncertainties, however the evidence for the `disappearance' of nu_mu's and
antinu_mu's obtained by SK and other underground detectors is robust and cannot
be accounted in the framework of the minimum standard model without assuming
very large ad hoc experimental systematic effects. The existence of `new
physics' beyond the standard model is therefore close to be established;
neutrino oscillations provide a very good fit to all data. The theoretical
uncertainties do have an important role in the detailed interpretation of the
data, and in the estimate of oscillation parameters.
|
[
{
"created": "Thu, 27 May 1999 10:48:15 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Lipari",
"Paolo",
""
]
] |
The predictions of the atmospheric nu event rates are affected by significant uncertainties, however the evidence for the `disappearance' of nu_mu's and antinu_mu's obtained by SK and other underground detectors is robust and cannot be accounted in the framework of the minimum standard model without assuming very large ad hoc experimental systematic effects. The existence of `new physics' beyond the standard model is therefore close to be established; neutrino oscillations provide a very good fit to all data. The theoretical uncertainties do have an important role in the detailed interpretation of the data, and in the estimate of oscillation parameters.
|
1603.00750
|
Aleksi Vuorinen
|
Aleksi Kurkela and Aleksi Vuorinen
|
Cool quark matter
|
8 pages, 3 figures; v2: minor improvements, version published in PRL
(without appendices)
|
Phys. Rev. Lett. 117, 042501 (2016)
|
10.1103/PhysRevLett.117.042501
|
CERN-PH-TH/2016-045, HIP-2016-06/TH
|
hep-ph astro-ph.HE nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We generalize the state-of-the-art perturbative Equation of State of cold
quark matter to nonzero temperatures, needed in the description of neutron star
mergers and core collapse processes. The new result is accurate to order g^5 in
the gauge coupling, and is based on a novel framework for dealing with the
infrared sensitive soft field modes of the theory. The zero Matsubara mode
sector is treated using a dimensionally reduced effective theory, while the
soft non-zero modes are resummed using the Hard Thermal Loop approximation.
This combination of known effective descriptions offers unprecedented access to
small but nonzero temperatures, both in and out of beta equilibrium.
|
[
{
"created": "Wed, 2 Mar 2016 15:31:57 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Jul 2016 10:37:55 GMT",
"version": "v2"
}
] |
2016-07-27
|
[
[
"Kurkela",
"Aleksi",
""
],
[
"Vuorinen",
"Aleksi",
""
]
] |
We generalize the state-of-the-art perturbative Equation of State of cold quark matter to nonzero temperatures, needed in the description of neutron star mergers and core collapse processes. The new result is accurate to order g^5 in the gauge coupling, and is based on a novel framework for dealing with the infrared sensitive soft field modes of the theory. The zero Matsubara mode sector is treated using a dimensionally reduced effective theory, while the soft non-zero modes are resummed using the Hard Thermal Loop approximation. This combination of known effective descriptions offers unprecedented access to small but nonzero temperatures, both in and out of beta equilibrium.
|
1012.4603
|
Joaquim Matias
|
Ulrik Egede (Imperial Coll., London), Tobias Hurth (Mainz U., Inst.
Phys.), Joaquim Matias, Marc Ramon (Barcelona, Autonoma U.), Will Reece
(CERN)
|
Symmetries in the angular distribution of exclusive semileptonic B
decays
|
Based on talks given at CKM2010, the 6th International Workshop on
the CKM Unitarity Triangle, University of Warwick, UK, 6-10 September 2010
and ICHEP2010, 35th International Conference on High Energy Physics
ICHEP2010, Paris, France, 21-28 July 2010
| null | null |
UAB-FT-686, MZ-TH/10-48
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss a method to construct observables protected against QCD
uncertainties based on the angular distribution of the exclusive Bd -> K(*0}(->
Kpi) l+ l- decay. We focus on the identification and the interpretation of all
the symmetries of the distribution. They constitute a key ingredient to
construct a set of so-called transverse observables. We work in the framework
of QCD factorization at NLO supplemented by an estimate of power-suppressed
Lambda/mb corrections. A discussion of the new physics properties of two of the
transverse asymmetries, AT^{(2)} and AT^{(5)}, is presented. A comparison
between the transverse asymmetry AT^{(2)} and the forward-backward asymmetry
shows that AT^{(2)} emerges as an improved version of it.
|
[
{
"created": "Tue, 21 Dec 2010 10:56:47 GMT",
"version": "v1"
}
] |
2010-12-22
|
[
[
"Egede",
"Ulrik",
"",
"Imperial Coll., London"
],
[
"Hurth",
"Tobias",
"",
"Mainz U., Inst.\n Phys."
],
[
"Matias",
"Joaquim",
"",
"Barcelona, Autonoma U."
],
[
"Ramon",
"Marc",
"",
"Barcelona, Autonoma U."
],
[
"Reece",
"Will",
"",
"CERN"
]
] |
We discuss a method to construct observables protected against QCD uncertainties based on the angular distribution of the exclusive Bd -> K(*0}(-> Kpi) l+ l- decay. We focus on the identification and the interpretation of all the symmetries of the distribution. They constitute a key ingredient to construct a set of so-called transverse observables. We work in the framework of QCD factorization at NLO supplemented by an estimate of power-suppressed Lambda/mb corrections. A discussion of the new physics properties of two of the transverse asymmetries, AT^{(2)} and AT^{(5)}, is presented. A comparison between the transverse asymmetry AT^{(2)} and the forward-backward asymmetry shows that AT^{(2)} emerges as an improved version of it.
|
2008.12923
|
Lu\'is Ventura
|
Jamie I. McDonald, Lu\'is B. Ventura
|
Bending of light in axion backgrounds
|
14 pages, 7 figures. Comments are welcome
| null | null | null |
hep-ph gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work we examine refraction of light by computing full solutions to
axion electrodynamics. We also allow for the possibility of an additional
plasma component. We then specialise to wavelengths which are small compared to
background scales to determine if refraction can be described by geometric
optics. We also allow for the possibility of an additional plasma component. In
the absence of plasma, for small incidence angles relative to the optical axis,
axion electrodynamics and geometric optics are in good agreement, with
refraction occurring at $\mathcal{O}(g_{a \gamma \gamma}^2)$. However, for rays
which lie far from the optical axis, the agreement with geometric optics breaks
down and the dominant refraction requires a full wave-optical treatment,
occurring at $\mathcal{O}(g_{a \gamma \gamma})$. In the presence of
sufficiently large plasma masses, the wave-like nature of light becomes
suppressed and geometric optics is in good agreement with the full theory for
all rays. Our results therefore suggest the necessity of a more comprehensive
study of lensing and ray-tracing in axion backgrounds, including a full account
of the novel $\mathcal{O}(g_{a \gamma \gamma})$ wave-optical contribution to
refraction.
|
[
{
"created": "Sat, 29 Aug 2020 06:49:56 GMT",
"version": "v1"
}
] |
2020-09-01
|
[
[
"McDonald",
"Jamie I.",
""
],
[
"Ventura",
"Luís B.",
""
]
] |
In this work we examine refraction of light by computing full solutions to axion electrodynamics. We also allow for the possibility of an additional plasma component. We then specialise to wavelengths which are small compared to background scales to determine if refraction can be described by geometric optics. We also allow for the possibility of an additional plasma component. In the absence of plasma, for small incidence angles relative to the optical axis, axion electrodynamics and geometric optics are in good agreement, with refraction occurring at $\mathcal{O}(g_{a \gamma \gamma}^2)$. However, for rays which lie far from the optical axis, the agreement with geometric optics breaks down and the dominant refraction requires a full wave-optical treatment, occurring at $\mathcal{O}(g_{a \gamma \gamma})$. In the presence of sufficiently large plasma masses, the wave-like nature of light becomes suppressed and geometric optics is in good agreement with the full theory for all rays. Our results therefore suggest the necessity of a more comprehensive study of lensing and ray-tracing in axion backgrounds, including a full account of the novel $\mathcal{O}(g_{a \gamma \gamma})$ wave-optical contribution to refraction.
|
hep-ph/9612241
|
Bob Holdom
|
B. Holdom and Qing Wang
|
Dynamical Perturbation Theory and the Auxiliary Field Method
|
16 pages with 4 figures, to appear in Physical Review D
|
Phys.Rev. D55 (1997) 3101-3110
|
10.1103/PhysRevD.55.3101
|
UTPT-96-18
|
hep-ph
| null |
By introducing auxiliary fields, which by their quantum numbers vanish in
perturbation theory, we relate the dynamical perturbation theory of Pagels and
Stokar and a successful gauged nonlocal constituent quark model to $U(N)$ gauge
theory and to QCD. This sheds light on the duality between quark models and
resonance models. We then derive the effective action in the loop expansion
without dropping cubic and quartic gluon couplings.
|
[
{
"created": "Tue, 3 Dec 1996 20:03:04 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Holdom",
"B.",
""
],
[
"Wang",
"Qing",
""
]
] |
By introducing auxiliary fields, which by their quantum numbers vanish in perturbation theory, we relate the dynamical perturbation theory of Pagels and Stokar and a successful gauged nonlocal constituent quark model to $U(N)$ gauge theory and to QCD. This sheds light on the duality between quark models and resonance models. We then derive the effective action in the loop expansion without dropping cubic and quartic gluon couplings.
|
1212.4520
|
Sarah Andreas
|
Sarah Andreas
|
Hidden Photons in beam dump experiments and in connection with Dark
Matter
|
10 pages, 3 figures, contribution to the proceedings of the "DARK2012
Workshop on Dark Forces at Accelerators", INFN Laboratories Frascati (LNF),
Italy, October 16th to 19th, 2012
| null | null |
DESY 12-238
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Hidden sectors with light extra U(1) gauge bosons, so-called hidden photons,
recently received much interest as natural feature of beyond standard model
scenarios like string theory and SUSY and because of their possible connection
to dark matter. This paper presents limits on hidden photons from past electron
beam dump experiments including two new limits from experiments at KEK and
Orsay. Additionally, various hidden sector models containing both a hidden
photon and a dark matter candidate are discussed with respect to their
viability and potential signatures in direct detection.
|
[
{
"created": "Tue, 18 Dec 2012 21:55:35 GMT",
"version": "v1"
}
] |
2012-12-20
|
[
[
"Andreas",
"Sarah",
""
]
] |
Hidden sectors with light extra U(1) gauge bosons, so-called hidden photons, recently received much interest as natural feature of beyond standard model scenarios like string theory and SUSY and because of their possible connection to dark matter. This paper presents limits on hidden photons from past electron beam dump experiments including two new limits from experiments at KEK and Orsay. Additionally, various hidden sector models containing both a hidden photon and a dark matter candidate are discussed with respect to their viability and potential signatures in direct detection.
|
hep-ph/0702268
|
Hung-Liang Lai
|
H.L. Lai, P. Nadolsky, J. Pumplin, D. Stump, W.K. Tung, C.-P. Yuan
|
The Strange Parton Distribution of the Nucleon: Global Analysis and
Applications
|
19 pages; revised version submitted to JHEP
|
JHEP 0704:089,2007
|
10.1088/1126-6708/2007/04/089
|
ANL-HEP-PR-07-14, MSU-HEP-07012
|
hep-ph
| null |
The strangeness degrees of freedom in the parton structure of the nucleon are
explored in the global analysis framework, using the new CTEQ6.5 implementation
of the general mass perturbative QCD formalism of Collins. We systematically
determine the constraining power of available hard scattering experimental data
on the magnitude and shape of the strange quark and anti-quark parton
distributions. We find that current data favor a distinct shape of the strange
sea compared to the isoscalar non-strange sea. A new reference parton
distribution set, CTEQ6.5S0, and representative sets spanning the allowed
ranges of magnitude and shape of the strange distributions, are presented. Some
applications to physical processes of current interest in hadron collider
phenomenology are discussed.
|
[
{
"created": "Mon, 26 Feb 2007 20:24:17 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Apr 2007 17:40:54 GMT",
"version": "v2"
}
] |
2014-11-18
|
[
[
"Lai",
"H. L.",
""
],
[
"Nadolsky",
"P.",
""
],
[
"Pumplin",
"J.",
""
],
[
"Stump",
"D.",
""
],
[
"Tung",
"W. K.",
""
],
[
"Yuan",
"C. -P.",
""
]
] |
The strangeness degrees of freedom in the parton structure of the nucleon are explored in the global analysis framework, using the new CTEQ6.5 implementation of the general mass perturbative QCD formalism of Collins. We systematically determine the constraining power of available hard scattering experimental data on the magnitude and shape of the strange quark and anti-quark parton distributions. We find that current data favor a distinct shape of the strange sea compared to the isoscalar non-strange sea. A new reference parton distribution set, CTEQ6.5S0, and representative sets spanning the allowed ranges of magnitude and shape of the strange distributions, are presented. Some applications to physical processes of current interest in hadron collider phenomenology are discussed.
|
1012.4580
|
Slava Khruschev
|
V. V. Khruschov
|
Snyder-Yang algebra and confinement of color particles
|
3 pages
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A model of color particle confinement is considered. The model is based on
the Snyder-Yang algebra, which takes into account a non-commutativity of
generalized momenta and coordinates of a color particle and contains two new
constants. An extended kinematical invariance in a quantum phase space of a
color particle gives rise to an invariant equation with an oscillator rising
potential. The presence of the oscillator rising potential can simulate a
confinement of a color particle. Mass and lenght parameters involved in the
Snyder-Yang commutation relations along with parameters of current and
constituent quarks are estimated.
|
[
{
"created": "Tue, 21 Dec 2010 09:30:39 GMT",
"version": "v1"
}
] |
2010-12-22
|
[
[
"Khruschov",
"V. V.",
""
]
] |
A model of color particle confinement is considered. The model is based on the Snyder-Yang algebra, which takes into account a non-commutativity of generalized momenta and coordinates of a color particle and contains two new constants. An extended kinematical invariance in a quantum phase space of a color particle gives rise to an invariant equation with an oscillator rising potential. The presence of the oscillator rising potential can simulate a confinement of a color particle. Mass and lenght parameters involved in the Snyder-Yang commutation relations along with parameters of current and constituent quarks are estimated.
|
hep-ph/0206025
|
Jae Sik Lee
|
S.Y. Choi (Chonbuk National University), Byungchul Chung (KAIST), P.
Ko (KAIST) and Jae Sik Lee (KEK)
|
CP--violating Chargino Contributions to the Higgs Coupling to Photon
Pairs in the Decoupling Regime of Higgs Sector
|
1+13 pages, 3 eps figures
|
Phys.Rev. D66 (2002) 016009
|
10.1103/PhysRevD.66.016009
|
KAIST-TH-2002/14, KEK-TH-826
|
hep-ph
| null |
In most supersymmetric theories, charginos $\tilde{\chi}^\pm_{1,2}$ belong to
the class of the lightest supersymmetric particles and the couplings of Higgs
bosons to charginos are in general complex so that the CP--violating chargino
contributions to the loop--induced coupling of the lightest Higgs boson to
photon pairs can be sizable even in the decoupling limit of large pseudoscalar
mass $m_A$ with only the lightest Higgs boson kinematically accessible at
future high energy colliders. We introduce a specific benchmark scenario of CP
violation consistent with the electric dipole moment constraints and with a
commonly accepted baryogenesis mechanism in the minimal supersymmetric Standard
Model. Based on the benchmark scenario of CP violation, we demonstrate that the
fusion of the lightest Higgs boson in linearly polarized photon--photon
collisions can allow us to confirm the existence of the CP--violating chargino
contributions {\it even in the decoupling regime of the Higgs sector} for
nearly degenerate SU(2) gaugino and higgsino mass parameters of about the
electroweak scale.
|
[
{
"created": "Tue, 4 Jun 2002 06:27:39 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Choi",
"S. Y.",
"",
"Chonbuk National University"
],
[
"Chung",
"Byungchul",
"",
"KAIST"
],
[
"Ko",
"P.",
"",
"KAIST"
],
[
"Lee",
"Jae Sik",
"",
"KEK"
]
] |
In most supersymmetric theories, charginos $\tilde{\chi}^\pm_{1,2}$ belong to the class of the lightest supersymmetric particles and the couplings of Higgs bosons to charginos are in general complex so that the CP--violating chargino contributions to the loop--induced coupling of the lightest Higgs boson to photon pairs can be sizable even in the decoupling limit of large pseudoscalar mass $m_A$ with only the lightest Higgs boson kinematically accessible at future high energy colliders. We introduce a specific benchmark scenario of CP violation consistent with the electric dipole moment constraints and with a commonly accepted baryogenesis mechanism in the minimal supersymmetric Standard Model. Based on the benchmark scenario of CP violation, we demonstrate that the fusion of the lightest Higgs boson in linearly polarized photon--photon collisions can allow us to confirm the existence of the CP--violating chargino contributions {\it even in the decoupling regime of the Higgs sector} for nearly degenerate SU(2) gaugino and higgsino mass parameters of about the electroweak scale.
|
1609.08666
|
Yury Bystritskiy
|
A.G. Aleksejevs, S.G. Barkanova, Yu.M. Bystritskiy, V.A. Zykunov
|
Low and High Energy Asymptotic Behavior of Electroweak Corrections in
Polarized $e^+ e^- \to \mu^+ \mu^-$ Process
|
9 pages, 1 table, 7 figures. Some minor changes in Introduction and
Conclusion
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Electroweak radiative corrections will play a major role in the analysis of
several upcoming ultra-precision experiments such as Belle-II, so is crucial to
make sure that they are fully under control. The article outlines the recent
developments in the theoretical and computational approaches to one-loop (NLO)
electroweak radiative corrections to the parity-violating asymmetry in $e^- e^+
\to \mu^- \mu^+ (\gamma)$ process with longitudinally polarized electrons. We
derive asymptotic expressions for low and high energy regions (well below or
above $Z$-resonance, correspondingly) and analyze the leading contributions.
For most of energy regions, our results are in good agreement with precise
computer-algebra based calculation and can used as a quicker alternative.
|
[
{
"created": "Tue, 27 Sep 2016 20:59:30 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Mar 2017 18:28:14 GMT",
"version": "v2"
}
] |
2017-03-23
|
[
[
"Aleksejevs",
"A. G.",
""
],
[
"Barkanova",
"S. G.",
""
],
[
"Bystritskiy",
"Yu. M.",
""
],
[
"Zykunov",
"V. A.",
""
]
] |
Electroweak radiative corrections will play a major role in the analysis of several upcoming ultra-precision experiments such as Belle-II, so is crucial to make sure that they are fully under control. The article outlines the recent developments in the theoretical and computational approaches to one-loop (NLO) electroweak radiative corrections to the parity-violating asymmetry in $e^- e^+ \to \mu^- \mu^+ (\gamma)$ process with longitudinally polarized electrons. We derive asymptotic expressions for low and high energy regions (well below or above $Z$-resonance, correspondingly) and analyze the leading contributions. For most of energy regions, our results are in good agreement with precise computer-algebra based calculation and can used as a quicker alternative.
|
1809.04849
|
Felix Kahlhoefer
|
Saniya Heeba, Felix Kahlhoefer and Patrick St\"ocker
|
Freeze-in production of decaying dark matter in five steps
|
23 pages, 11 figures + appendix; v2: matches published version
|
JCAP 1811 (2018) no.11, 048
|
10.1088/1475-7516/2018/11/048
|
TTK-18-38
|
hep-ph astro-ph.CO
|
http://creativecommons.org/licenses/by/4.0/
|
We study the cosmological evolution and phenomenological properties of scalar
bosons in the keV to MeV range that have a tiny mixing with the Standard Model
Higgs boson. The mixing determines both the abundance of light scalars produced
via the freeze-in mechanism and their lifetime. Intriguingly, the parameters
required for such scalars to account for all of the dark matter in the present
Universe generically predict lifetimes comparable to the sensitivity of present
and future indirect detection experiments. In order to accurately determine the
relic abundance of light scalars, we calculate freeze-in yields including
effects from finite temperatures and quantum statistics and develop a new
approach for solving the Boltzmann equation for number-changing processes in
the dark sector. We find that light scalars can potentially explain the
anomalous x-ray emission at 3.5 keV, while evading constraints from structure
formation and predicting potentially observable self-interaction cross
sections.
|
[
{
"created": "Thu, 13 Sep 2018 09:20:05 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Dec 2018 12:41:02 GMT",
"version": "v2"
}
] |
2018-12-06
|
[
[
"Heeba",
"Saniya",
""
],
[
"Kahlhoefer",
"Felix",
""
],
[
"Stöcker",
"Patrick",
""
]
] |
We study the cosmological evolution and phenomenological properties of scalar bosons in the keV to MeV range that have a tiny mixing with the Standard Model Higgs boson. The mixing determines both the abundance of light scalars produced via the freeze-in mechanism and their lifetime. Intriguingly, the parameters required for such scalars to account for all of the dark matter in the present Universe generically predict lifetimes comparable to the sensitivity of present and future indirect detection experiments. In order to accurately determine the relic abundance of light scalars, we calculate freeze-in yields including effects from finite temperatures and quantum statistics and develop a new approach for solving the Boltzmann equation for number-changing processes in the dark sector. We find that light scalars can potentially explain the anomalous x-ray emission at 3.5 keV, while evading constraints from structure formation and predicting potentially observable self-interaction cross sections.
|
1012.3842
|
Chitta Ranjan Das
|
Joao Pulido, C.R. Das
|
NSI can improve LMA predictions: neutrino decay in solar matter?
|
3 pages, 3 figures, Parallel talk in "NOW 2010" Neutrino Oscillation
Workshop, Conca Specchiulla (Otranto, Lecce, Italy), September 4-11, 2010
|
Nucl.Phys.Proc.Suppl.217:350-352,2011
|
10.1016/j.nuclphysbps.2011.04.136
|
CFTP/10-019
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the prospects for non-standard interactions (NSI) in solar
neutrino propagation and detection and find that these may solve the tension
between the observed flatness of the SuperKamiokande electron spectrum and its
LMA prediction which has a clear negative slope. Also the Cl rate prediction
from NSI comes within 1$\sigma$ of its experimental value instead of the LMA
one which lies more than 2$\sigma$ above. A remarkable consequence of NSI for
solar neutrinos is the possibility of neutrino decay into majorons and
antineutrinos whose appearance probability is calculated but found to be rather
small.
|
[
{
"created": "Fri, 17 Dec 2010 10:09:35 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Feb 2011 20:51:39 GMT",
"version": "v2"
}
] |
2011-08-17
|
[
[
"Pulido",
"Joao",
""
],
[
"Das",
"C. R.",
""
]
] |
We investigate the prospects for non-standard interactions (NSI) in solar neutrino propagation and detection and find that these may solve the tension between the observed flatness of the SuperKamiokande electron spectrum and its LMA prediction which has a clear negative slope. Also the Cl rate prediction from NSI comes within 1$\sigma$ of its experimental value instead of the LMA one which lies more than 2$\sigma$ above. A remarkable consequence of NSI for solar neutrinos is the possibility of neutrino decay into majorons and antineutrinos whose appearance probability is calculated but found to be rather small.
|
hep-ph/0109249
|
Ernest Ma
|
Ernest Ma (UC Riverside)
|
Muon g-2 and Neutrino Mass in a New Minimal Extension of the MSSM
|
10 pages, no figure, talk at Corfu 2001
| null | null |
UCRHEP-T316 (Sep 2001)
|
hep-ph
| null |
If the one term $(\hat \nu_e \hat \mu - \hat e \hat \nu_\mu) \hat \tau^c$ is
added to the MSSM (Minimal Supersymmetric Standard Model) superpotential, the
recently observed muon g--2 (anomalous magnetic moment) excess can be explained
very simply by a light $\tilde \nu_e$. If the soft symmetry-breaking terms
$\hat \nu_\alpha \hat h_2^0 - \hat l_\alpha \hat h_2^+$ are also added,
realistic neutrino masses (with bimaximal mixing) are generated as well.
|
[
{
"created": "Wed, 26 Sep 2001 15:50:54 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Ma",
"Ernest",
"",
"UC Riverside"
]
] |
If the one term $(\hat \nu_e \hat \mu - \hat e \hat \nu_\mu) \hat \tau^c$ is added to the MSSM (Minimal Supersymmetric Standard Model) superpotential, the recently observed muon g--2 (anomalous magnetic moment) excess can be explained very simply by a light $\tilde \nu_e$. If the soft symmetry-breaking terms $\hat \nu_\alpha \hat h_2^0 - \hat l_\alpha \hat h_2^+$ are also added, realistic neutrino masses (with bimaximal mixing) are generated as well.
|
1910.11415
|
Yu-Sheng Liu
|
Xiangdong Ji, Yizhuang Liu, Yu-Sheng Liu
|
TMD Soft Function from Large-Momentum Effective Theory
|
5 pages, 1 figure
| null |
10.1016/j.nuclphysb.2020.115054
| null |
hep-ph hep-ex hep-lat nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study Euclidean formulations of the transverse-momentum-dependent (TMD)
soft function, which is a cross section for soft gluon radiations involving
color charges moving in two conjugate lightcone directions in quantum
chromodynamics. We show it is related to a special form factor of a pair of
color sources traveling with nearly-lightlike velocities, which can be matched
to TMD physical observables in semi-inclusive deep-inelastic scattering and
Drell-Yan process in the framework of large momentum effective theory. It can
also be extracted by combining a large-momentum form factor of light meson and
its leading TMD wave function. These formulations are useful for initiating
nonperturbative calculations of this useful quantity.
|
[
{
"created": "Thu, 24 Oct 2019 20:30:26 GMT",
"version": "v1"
},
{
"created": "Sun, 10 May 2020 16:07:23 GMT",
"version": "v2"
},
{
"created": "Fri, 5 Jun 2020 02:46:44 GMT",
"version": "v3"
}
] |
2020-06-24
|
[
[
"Ji",
"Xiangdong",
""
],
[
"Liu",
"Yizhuang",
""
],
[
"Liu",
"Yu-Sheng",
""
]
] |
We study Euclidean formulations of the transverse-momentum-dependent (TMD) soft function, which is a cross section for soft gluon radiations involving color charges moving in two conjugate lightcone directions in quantum chromodynamics. We show it is related to a special form factor of a pair of color sources traveling with nearly-lightlike velocities, which can be matched to TMD physical observables in semi-inclusive deep-inelastic scattering and Drell-Yan process in the framework of large momentum effective theory. It can also be extracted by combining a large-momentum form factor of light meson and its leading TMD wave function. These formulations are useful for initiating nonperturbative calculations of this useful quantity.
|
1903.01448
|
Ho-Meoyng Choi
|
Ho-Meoyng Choi, Hui-Young Ryu, and Chueng-Ryong Ji
|
The doubly virtual $(\pi^0,\eta,\eta')\to\gamma^*\gamma^*$ transition
form factors in the light-front quark model
|
7 pages, 6 figures. Slight change of title, Correct some typos;
version to appear in Phys. Rev.D. arXiv admin note: substantial text overlap
with arXiv:1708.00736
|
Phys. Rev. D 99, 076012 (2019)
|
10.1103/PhysRevD.99.076012
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report our investigation on the doubly virtual TFFs $F_{{\rm
P}\gamma^*}(Q^2_1,Q^2_2)$ for the ${\rm P}\to\gamma^*(q_1)\gamma^*(q_2) \;({\rm
P}=\pi^0,\eta,\eta')$ transitions using the light-front quark model (LFQM).
Performing a LF calculation in the exactly solvable manifestly covariant
Bethe-Salpeter (BS) model as the first illustration, we used $q^+_1=0$ frame
and found that both LF and manifestly covariant calculations produce exactly
the same results for $F_{{\rm P}\gamma^*}(Q^2_1,Q^2_2)$. This confirms the
absence of the LF zero mode in the doubly virtual TFFs. We then mapped this
covariant BS model to the standard LFQM using the more phenomenologically
accessible Gaussian wave function provided by the LFQM analysis of meson mass
spectra. For the numerical analyses of $F_{{\rm P}\gamma^*}(Q^2_1,Q^2_2)$, we
compared our LFQM results with the available experimental data and the
perturbative QCD (pQCD) and the vector meson dominance (VMD) model predictions.
As $(Q^2_1, Q^2_2)\to\infty$, our LFQM result for doubly virtual TFF is
consistent with the pQCD prediction, i.e. $F_{{\rm P}\gamma^*}(Q^2_1,
Q^2_2)\sim 1/(Q^2_1 + Q^2_2)$, while it differs far from the result of VMD
model which behaves $F^{\rm VMD}_{{\rm P}\gamma^*}(Q^2_1, Q^2_2)\sim 1/(Q^2_1
Q^2_2)$. Our LFQM prediction for $F_{\eta'\gamma^*}(Q^2_1,Q^2_2)$ shows an
agreement with the very recent experimental data obtained from the BaBar
collaboration for the ranges of $2< Q^2_1, Q^2_1 <60$ GeV$^2$.
|
[
{
"created": "Sun, 3 Mar 2019 23:33:58 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Apr 2019 00:46:46 GMT",
"version": "v2"
}
] |
2019-04-24
|
[
[
"Choi",
"Ho-Meoyng",
""
],
[
"Ryu",
"Hui-Young",
""
],
[
"Ji",
"Chueng-Ryong",
""
]
] |
We report our investigation on the doubly virtual TFFs $F_{{\rm P}\gamma^*}(Q^2_1,Q^2_2)$ for the ${\rm P}\to\gamma^*(q_1)\gamma^*(q_2) \;({\rm P}=\pi^0,\eta,\eta')$ transitions using the light-front quark model (LFQM). Performing a LF calculation in the exactly solvable manifestly covariant Bethe-Salpeter (BS) model as the first illustration, we used $q^+_1=0$ frame and found that both LF and manifestly covariant calculations produce exactly the same results for $F_{{\rm P}\gamma^*}(Q^2_1,Q^2_2)$. This confirms the absence of the LF zero mode in the doubly virtual TFFs. We then mapped this covariant BS model to the standard LFQM using the more phenomenologically accessible Gaussian wave function provided by the LFQM analysis of meson mass spectra. For the numerical analyses of $F_{{\rm P}\gamma^*}(Q^2_1,Q^2_2)$, we compared our LFQM results with the available experimental data and the perturbative QCD (pQCD) and the vector meson dominance (VMD) model predictions. As $(Q^2_1, Q^2_2)\to\infty$, our LFQM result for doubly virtual TFF is consistent with the pQCD prediction, i.e. $F_{{\rm P}\gamma^*}(Q^2_1, Q^2_2)\sim 1/(Q^2_1 + Q^2_2)$, while it differs far from the result of VMD model which behaves $F^{\rm VMD}_{{\rm P}\gamma^*}(Q^2_1, Q^2_2)\sim 1/(Q^2_1 Q^2_2)$. Our LFQM prediction for $F_{\eta'\gamma^*}(Q^2_1,Q^2_2)$ shows an agreement with the very recent experimental data obtained from the BaBar collaboration for the ranges of $2< Q^2_1, Q^2_1 <60$ GeV$^2$.
|
2302.10458
|
Xin Wu
|
Xin Wu, Xinbai Li, Zebo Tang, Pengfei Wang and Wangmei Zha
|
Reaction plane alignment with linearly polarized photon in heavy-ion
collisions
| null |
Physical Review Research 4, L042048 (2022)
|
10.1103/PhysRevResearch.4.L042048
| null |
hep-ph nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
The collective observables play critical roles in probing the properties of
quark-gluon-plasma created in relativistic heavy-ion collisions, in which the
information on initial collision geometry is crucial. However, the initial
collision geometry, e.g., the reaction plane, cannot be directly extracted in
the experiment. In this paper, we demonstrate the idea of determining the
reaction plane via the feature of linear polarization of the coherent
photoproduction process and discuss the advantages of the proposed approach in
comparison with traditional methods.
|
[
{
"created": "Tue, 21 Feb 2023 05:56:07 GMT",
"version": "v1"
}
] |
2023-02-22
|
[
[
"Wu",
"Xin",
""
],
[
"Li",
"Xinbai",
""
],
[
"Tang",
"Zebo",
""
],
[
"Wang",
"Pengfei",
""
],
[
"Zha",
"Wangmei",
""
]
] |
The collective observables play critical roles in probing the properties of quark-gluon-plasma created in relativistic heavy-ion collisions, in which the information on initial collision geometry is crucial. However, the initial collision geometry, e.g., the reaction plane, cannot be directly extracted in the experiment. In this paper, we demonstrate the idea of determining the reaction plane via the feature of linear polarization of the coherent photoproduction process and discuss the advantages of the proposed approach in comparison with traditional methods.
|
hep-ph/9906238
|
George Leontaris
|
E.G. Floratos, G.K. Leontaris
|
Low Scale Unification, Newton's Law and Extra Dimensions
|
12pages, 2 figures
|
Phys.Lett. B465 (1999) 95-100
|
10.1016/S0370-2693(99)01019-9
| null |
hep-ph astro-ph hep-th
| null |
Motivated by recent work on low energy unification, in this short note we
derive corrections on Newton's inverse square law due to the existence of extra
decompactified dimensions. In the four-dimensional macroscopic limit we find
that the corrections are of Yukawa type. Inside the compactified space of
n-extra dimensions the sub-leading term is proportional to the (n+1)- power of
the distance over the compactification radius ratio. Some physical implications
of these modifications are briefly discussed.
|
[
{
"created": "Thu, 3 Jun 1999 18:07:29 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Floratos",
"E. G.",
""
],
[
"Leontaris",
"G. K.",
""
]
] |
Motivated by recent work on low energy unification, in this short note we derive corrections on Newton's inverse square law due to the existence of extra decompactified dimensions. In the four-dimensional macroscopic limit we find that the corrections are of Yukawa type. Inside the compactified space of n-extra dimensions the sub-leading term is proportional to the (n+1)- power of the distance over the compactification radius ratio. Some physical implications of these modifications are briefly discussed.
|
hep-ph/0011342
|
Meenu Dahiya
|
Ashok Goyal, Meenu Dahiya
|
NJL model in Four Dimension at Finite Temperature, Chemical Potentialand
Curvature
|
LaTex2e file with 7 postscript figures, 18 pages
|
J.Phys.G27:1827,2001
|
10.1088/0954-3899/27/8/312
| null |
hep-ph
| null |
Two flavor Nambu-Jona-Lasinio model with N components is studied in curved
space time at finite temperature and density in the leading 1/N expansion. In
four space time dimension the model exhibits first order phase transition for
positive curvature. Whereas in flat space an increase in temperature induces a
second order phase transition even at finite density, in curved space the
transition becomes first order. We obtain the phase boundary in
density-temperature plane and exhibit its behavior with changing curvature. A
three dimensional plot of the phase boundary in $\mu$-T-R space is drawn.
|
[
{
"created": "Tue, 28 Nov 2000 10:18:20 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Goyal",
"Ashok",
""
],
[
"Dahiya",
"Meenu",
""
]
] |
Two flavor Nambu-Jona-Lasinio model with N components is studied in curved space time at finite temperature and density in the leading 1/N expansion. In four space time dimension the model exhibits first order phase transition for positive curvature. Whereas in flat space an increase in temperature induces a second order phase transition even at finite density, in curved space the transition becomes first order. We obtain the phase boundary in density-temperature plane and exhibit its behavior with changing curvature. A three dimensional plot of the phase boundary in $\mu$-T-R space is drawn.
|
hep-ph/9809209
|
Utpal Sarkar
|
Utpal Sarkar
|
Electroweak Baryon Number Violation and Constraints on Left-handed
Majorana Neutrino Masses
|
20 pages latex file with iopconf.sty and four postscript figures (to
appear in Proc Int Symp on Lepton and Baryon Number Violation, April 20-25,
Trento, Italy, 1998). References added
| null | null | null |
hep-ph
| null |
During a large period of time, the anomalous baryon number violating
interactions are in equilibrium, when the $(B+L)$ asymmetry is washed out. If
there is any lepton number violation during this period, that will also erase
the $(B-L)$ asymmetry. As a result, survival of the baryon asymmetry of the
universe pose strong constraints on lepton number violating interactions. We
review here the constraints on the left-handed Majorana neutrino masses arising
from this survival requirement of the baryon asymmetry of the universe. We then
briefly review models of leptogenesis, where lepton number violation is used to
generate a baryon asymmetry of the universe and hence the constraints on the
Majorana neutrino mass is relaxed.
|
[
{
"created": "Tue, 1 Sep 1998 10:13:15 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Sep 1998 10:36:24 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Sarkar",
"Utpal",
""
]
] |
During a large period of time, the anomalous baryon number violating interactions are in equilibrium, when the $(B+L)$ asymmetry is washed out. If there is any lepton number violation during this period, that will also erase the $(B-L)$ asymmetry. As a result, survival of the baryon asymmetry of the universe pose strong constraints on lepton number violating interactions. We review here the constraints on the left-handed Majorana neutrino masses arising from this survival requirement of the baryon asymmetry of the universe. We then briefly review models of leptogenesis, where lepton number violation is used to generate a baryon asymmetry of the universe and hence the constraints on the Majorana neutrino mass is relaxed.
|
2104.06602
|
Wei Cheng
|
Wei Cheng, Ligong Bian, and Yu-Feng Zhou
|
Axion-like particle inflation and dark matter
|
7 pages, 6 figures
|
Phys. Rev. D 104, 063010 (2021)
|
10.1103/PhysRevD.104.063010
| null |
hep-ph astro-ph.HE hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
In this paper, we propose a generalized natural inflation (GNI) model to
study axion-like particle (ALP) inflation and dark matter (DM). GNI contains
two additional parameters $(n_1, n_2)$ in comparison with the natural
inflation, that make GNI more general. The $n_1$ build the connection between
GNI and other ALP inflation model, $n_2$ controls the inflaton mass. After
considering the cosmic microwave background and other cosmological observation
limits, the model can realize small-field inflation with a wide mass range, and
the ALP inflaton considering here can serve as the DM candidate for certain
parameter spaces.
|
[
{
"created": "Wed, 14 Apr 2021 03:03:11 GMT",
"version": "v1"
}
] |
2021-09-15
|
[
[
"Cheng",
"Wei",
""
],
[
"Bian",
"Ligong",
""
],
[
"Zhou",
"Yu-Feng",
""
]
] |
In this paper, we propose a generalized natural inflation (GNI) model to study axion-like particle (ALP) inflation and dark matter (DM). GNI contains two additional parameters $(n_1, n_2)$ in comparison with the natural inflation, that make GNI more general. The $n_1$ build the connection between GNI and other ALP inflation model, $n_2$ controls the inflaton mass. After considering the cosmic microwave background and other cosmological observation limits, the model can realize small-field inflation with a wide mass range, and the ALP inflaton considering here can serve as the DM candidate for certain parameter spaces.
|
hep-ph/0010272
|
Eugene Levin
|
Eugene Levin (Tel Aviv U./DESY)
|
Low x Physics
|
12 pages, 12 pictures in eps. files
|
Nucl.Phys.Proc.Suppl. 99A (2001) 180-187
|
10.1016/S0920-5632(01)01330-5
|
TAUP 2651-2000
|
hep-ph
| null |
This is a talk, given at Diffraction'2000, Sept. 2 - 7, Centraro, Italy. In
this talk, we present the arguments, that a new QCD regime - gluon saturation,
has been reached at HERA.
|
[
{
"created": "Tue, 24 Oct 2000 11:53:34 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Levin",
"Eugene",
"",
"Tel Aviv U./DESY"
]
] |
This is a talk, given at Diffraction'2000, Sept. 2 - 7, Centraro, Italy. In this talk, we present the arguments, that a new QCD regime - gluon saturation, has been reached at HERA.
|
0908.1079
|
R. Sekhar Chivukula
|
R. Sekhar Chivukula, Stefano Di Chiara, Roshan Foadi, and Elizabeth H.
Simmons
|
The Limits of Custodial Symmetry
|
19 pages, 11 eps figures. Typos corrected
|
Phys.Rev.D80:095001,2009; Erratum-ibid.D81:059902,2010
|
10.1103/PhysRevD.80.095001 10.1103/PhysRevD.81.059902
|
MSUHEP-080708
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce a toy model implementing the proposal of using a custodial
symmetry to protect the Zbb coupling from large corrections. This
"doublet-extended standard model" adds a weak doublet of fermions (including a
heavy partner of the top quark) to the particle content of the standard model
in order to implement an O(4) x U(1)_X = SU(2)_L x SU(2)_R x P_{LR} x U(1)_X
symmetry that protects the Zbb coupling. This symmetry is softly broken to the
gauged SU(2)_L x U(1)_Y electroweak symmetry by a Dirac mass M for the new
doublet; adjusting the value of M allows us to explore the range of
possibilities between the O(4)-symmetric (M to 0) and standard-model-like (M to
infinity) limits. In this simple model, we find that the experimental limits on
the Zbb coupling favor smaller M while the presence of a potentially sizable
negative contribution to T strongly favors large M. A fit to all precision
electroweak data shows that the heavy partner of the top quark must be heavier
than about 3.4 TeV, making it difficult to search for at LHC. This result
demonstrates that electroweak data strongly limits the amount by which the
custodial symmetry of the top-quark mass generating sector can be enhanced
relative to the standard model. Using an effective field theory calculation, we
illustrate how the leading contributions to alpha T, alpha S and the Zbb
coupling in this model arise from an effective operator coupling right-handed
top-quarks to the Z-boson, and how the effects on these observables are
correlated. We contrast this toy model with extra-dimensional models in which
the extended custodial symmetry is invoked to control the size of additional
contributions to alpha T and the Zbb coupling, while leaving the standard model
contributions essentially unchanged.
|
[
{
"created": "Fri, 7 Aug 2009 15:58:45 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Aug 2009 12:53:23 GMT",
"version": "v2"
},
{
"created": "Fri, 18 Sep 2009 17:32:41 GMT",
"version": "v3"
},
{
"created": "Wed, 14 Oct 2009 11:57:33 GMT",
"version": "v4"
}
] |
2014-11-20
|
[
[
"Chivukula",
"R. Sekhar",
""
],
[
"Di Chiara",
"Stefano",
""
],
[
"Foadi",
"Roshan",
""
],
[
"Simmons",
"Elizabeth H.",
""
]
] |
We introduce a toy model implementing the proposal of using a custodial symmetry to protect the Zbb coupling from large corrections. This "doublet-extended standard model" adds a weak doublet of fermions (including a heavy partner of the top quark) to the particle content of the standard model in order to implement an O(4) x U(1)_X = SU(2)_L x SU(2)_R x P_{LR} x U(1)_X symmetry that protects the Zbb coupling. This symmetry is softly broken to the gauged SU(2)_L x U(1)_Y electroweak symmetry by a Dirac mass M for the new doublet; adjusting the value of M allows us to explore the range of possibilities between the O(4)-symmetric (M to 0) and standard-model-like (M to infinity) limits. In this simple model, we find that the experimental limits on the Zbb coupling favor smaller M while the presence of a potentially sizable negative contribution to T strongly favors large M. A fit to all precision electroweak data shows that the heavy partner of the top quark must be heavier than about 3.4 TeV, making it difficult to search for at LHC. This result demonstrates that electroweak data strongly limits the amount by which the custodial symmetry of the top-quark mass generating sector can be enhanced relative to the standard model. Using an effective field theory calculation, we illustrate how the leading contributions to alpha T, alpha S and the Zbb coupling in this model arise from an effective operator coupling right-handed top-quarks to the Z-boson, and how the effects on these observables are correlated. We contrast this toy model with extra-dimensional models in which the extended custodial symmetry is invoked to control the size of additional contributions to alpha T and the Zbb coupling, while leaving the standard model contributions essentially unchanged.
|
1610.06034
|
Alan D. Martin
|
E.G. de Oliveira, A.D. Martin and M.G. Ryskin
|
Scale dependence of open $c\bar{c}$ and $b\bar{b}$ production in the low
$x$ region
|
14 pages, 6 figures; text improved; the branching ratio $b\to B$ and
the lower plot of Fig.6 corrected; version to appear in EPJC
| null | null |
IPPP/16/98
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The `optimal' factorization scale $\mu_0$ is calculated for open heavy quark
production. We find that the optimal value is $\mu_F=\mu_0\simeq
0.85\sqrt{p^2_T+m_Q^2} $; a choice which allows us to resum the
double-logarithmic, $(\alpha_s\ln\mu^2_F\ln(1/x))^n$ corrections (enhanced at
LHC energies by large values of $\ln(1/x)$) and to move them into the incoming
parton distributions, PDF$(x,\mu_0^2)$. Besides this result for the single
inclusive cross section (corresponding to an observed heavy quark of transverse
momentum $p_T$), we also determined the scale for processes where the
acoplanarity can be measured; that is, events where the azimuthal angle between
the quark and the antiquark may be determined experimentally. Moreover, we
discuss the important role played by the $2\to 2$ subprocesses, $gg\to
Q\bar{Q}$ at NLO and higher orders. In summary, we achieve a better stability
of the QCD calculations, so that the data on $c\bar{c}$ and $b\bar{b}$
production can be used to further constrain the gluons in the small $x$,
relatively low scale, domain, where the uncertainties of the global analyses
are large at present.
|
[
{
"created": "Wed, 19 Oct 2016 14:32:35 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Mar 2017 10:34:48 GMT",
"version": "v2"
}
] |
2017-03-07
|
[
[
"de Oliveira",
"E. G.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Ryskin",
"M. G.",
""
]
] |
The `optimal' factorization scale $\mu_0$ is calculated for open heavy quark production. We find that the optimal value is $\mu_F=\mu_0\simeq 0.85\sqrt{p^2_T+m_Q^2} $; a choice which allows us to resum the double-logarithmic, $(\alpha_s\ln\mu^2_F\ln(1/x))^n$ corrections (enhanced at LHC energies by large values of $\ln(1/x)$) and to move them into the incoming parton distributions, PDF$(x,\mu_0^2)$. Besides this result for the single inclusive cross section (corresponding to an observed heavy quark of transverse momentum $p_T$), we also determined the scale for processes where the acoplanarity can be measured; that is, events where the azimuthal angle between the quark and the antiquark may be determined experimentally. Moreover, we discuss the important role played by the $2\to 2$ subprocesses, $gg\to Q\bar{Q}$ at NLO and higher orders. In summary, we achieve a better stability of the QCD calculations, so that the data on $c\bar{c}$ and $b\bar{b}$ production can be used to further constrain the gluons in the small $x$, relatively low scale, domain, where the uncertainties of the global analyses are large at present.
|
1601.03749
|
Brandon Bryant
|
B. Charles Bryant and Stuart Raby
|
A Pati-Salam Version of Subcritical Hybrid Inflation
|
19 pages, 4 figures. v2: typo fixed, figure added, references added;
v3: additional typos fixed
|
Phys. Rev. D 93, 095003 (2016)
|
10.1103/PhysRevD.93.095003
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we present a model of subcritical hybrid inflation with a
Pati-Salam [PS] symmetry group. Both the inflaton and waterfall fields
contribute to the necessary e-foldings of inflation, while only the waterfall
field spontaneously breaks PS hence monopoles produced during inflation are
diluted during the inflationary epoch. The model is able to produce a
tensor-to-scalar ratio, $r < 0.09$ consistent with the latest BICEP2/Keck and
Planck data, as well as scalar density perturbations and spectral index, $n_s$,
consistent with Planck data. For particular values of the parameters, we find
$r = 0.084$ and $n_s = 0.0963$. The energy density during inflation is directly
related to the PS breaking scale, $v_{PS}$. The model also incorporates a
$\mathbb{Z}_4^R$ symmetry which can resolve the $\mu$ problem and suppress
dimension 5 operators for proton decay, leaving over an exact $R$-parity.
Finally the model allows for a complete three family extension with a $D_4$
family symmetry which reproduces low energy precision electroweak and LHC data.
|
[
{
"created": "Thu, 14 Jan 2016 21:00:23 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Feb 2016 16:13:13 GMT",
"version": "v2"
},
{
"created": "Wed, 17 Feb 2016 22:09:47 GMT",
"version": "v3"
}
] |
2016-05-11
|
[
[
"Bryant",
"B. Charles",
""
],
[
"Raby",
"Stuart",
""
]
] |
In this paper we present a model of subcritical hybrid inflation with a Pati-Salam [PS] symmetry group. Both the inflaton and waterfall fields contribute to the necessary e-foldings of inflation, while only the waterfall field spontaneously breaks PS hence monopoles produced during inflation are diluted during the inflationary epoch. The model is able to produce a tensor-to-scalar ratio, $r < 0.09$ consistent with the latest BICEP2/Keck and Planck data, as well as scalar density perturbations and spectral index, $n_s$, consistent with Planck data. For particular values of the parameters, we find $r = 0.084$ and $n_s = 0.0963$. The energy density during inflation is directly related to the PS breaking scale, $v_{PS}$. The model also incorporates a $\mathbb{Z}_4^R$ symmetry which can resolve the $\mu$ problem and suppress dimension 5 operators for proton decay, leaving over an exact $R$-parity. Finally the model allows for a complete three family extension with a $D_4$ family symmetry which reproduces low energy precision electroweak and LHC data.
|
1711.03928
|
Pieter Taels
|
Pieter Taels
|
Quantum Chromodynamics at small Bjorken-x
|
PhD thesis, defended at the University of Antwerp, Belgium, on July
3, 2017
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
With the advent of very powerful particle accelerators, such as RHIC and the
LHC, it becomes possible to study QCD in high energy collisions, in which the
gluon content of the proton or nucleus is probed and its density becomes often
large enough for nonlinear effects to play a role. This small-x regime of QCD
is well described by an effective theory known as the Color Glass Condensate
(CGC). In this thesis, we introduce the CGC and apply it to two different
problems.
First, we use the CGC to study forward heavy-quark production in pA
collisions. When the quarks are nearly back-to-back, the CGC result coincides
with the one in the TMD factorization approach. This allows us to extract the
small-x limit of the Weizs\"acker-Williams gluon distribution, as well as the
dipole distribution and one extra gluon TMD. Each of these gluon TMDs is
accompanied by a partner, which couples via the quark mass and which describes
the linearly polarized gluon content of the unpolarized nucleus. We calculate
the six resulting gluon TMDs analytically in the MV model, and evolve them in
rapidity using a numerical implementation of JIMWLK.
The second problem is situated within heavy-ion physics. Jets, produced in
the scattering of two nuclei, travel through the Quark-Gluon Plasma (QGP)
before reaching the detector, and are attenuated as a result of their
interaction with this medium. This phenomenon, known as jet quenching, is one
of the main probes to investigate the QGP. We focus on the transverse momentum
broadening of a hard particle traveling through a nuclear medium, and employ
small-x techniques to attempt to resum the leading logarithmic corrections due
to soft gluon radiation. Although, ultimately, we can only solve the resulting
in-medium evolution equation to DLA accuracy, we do present a concise framework
for the problem, and draw a detailed comparison with the CGC and with the
literature.
|
[
{
"created": "Fri, 10 Nov 2017 17:33:35 GMT",
"version": "v1"
}
] |
2017-11-13
|
[
[
"Taels",
"Pieter",
""
]
] |
With the advent of very powerful particle accelerators, such as RHIC and the LHC, it becomes possible to study QCD in high energy collisions, in which the gluon content of the proton or nucleus is probed and its density becomes often large enough for nonlinear effects to play a role. This small-x regime of QCD is well described by an effective theory known as the Color Glass Condensate (CGC). In this thesis, we introduce the CGC and apply it to two different problems. First, we use the CGC to study forward heavy-quark production in pA collisions. When the quarks are nearly back-to-back, the CGC result coincides with the one in the TMD factorization approach. This allows us to extract the small-x limit of the Weizs\"acker-Williams gluon distribution, as well as the dipole distribution and one extra gluon TMD. Each of these gluon TMDs is accompanied by a partner, which couples via the quark mass and which describes the linearly polarized gluon content of the unpolarized nucleus. We calculate the six resulting gluon TMDs analytically in the MV model, and evolve them in rapidity using a numerical implementation of JIMWLK. The second problem is situated within heavy-ion physics. Jets, produced in the scattering of two nuclei, travel through the Quark-Gluon Plasma (QGP) before reaching the detector, and are attenuated as a result of their interaction with this medium. This phenomenon, known as jet quenching, is one of the main probes to investigate the QGP. We focus on the transverse momentum broadening of a hard particle traveling through a nuclear medium, and employ small-x techniques to attempt to resum the leading logarithmic corrections due to soft gluon radiation. Although, ultimately, we can only solve the resulting in-medium evolution equation to DLA accuracy, we do present a concise framework for the problem, and draw a detailed comparison with the CGC and with the literature.
|
1912.13386
|
A H Ajjath
|
A. H. Ajjath, Pooja Mukherjee and V. Ravindran
|
Infrared structure of $SU(N)\times U(1)$ gauge theory to three loops
|
The updated version, which include corrected expression for beta
function, mixed QCD-QED anomalous dimensions and soft-virtual parsonic cross
section
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the infrared (IR) structure of $SU(N) \times U(1)$ (QCD $\times$
QED) gauge theory with $n_f$ quarks and $n_l$ leptons within the framework of
perturbation theory. In particular, we unravel the IR structure of the form
factors and inclusive real emission cross sections that contribute to inclusive
production of color neutral states, such as a pair of leptons or single W/Z in
Drell-Yan processes and a Higgs boson in bottom quark annihilation, in Large
Hadron Collider (LHC) in the threshold limit. Explicit computation of the
relevant form factors to third order and the use of Sudakov's $K+G$ equation in
$SU(N)\times U(1)$ gauge theory demonstrate the universality of the cusp
anomalous dimensions ($A_I , I = q, b$). The abelianization rules that relate
$A_I$ of $SU(N)$ with those from $U(1)$ and $SU(N)\times U(1)$ can be used to
predict the soft distribution that results from the soft gluon emission
subprocesses in the threshold limit. Using the latter and the third order form
factors, we can obtain the collinear anomalous dimensions ($B_I$ ) and the
renormalisation constant $Z_b$ to third order in perturbation theory. The form
factors, the process independent soft distribution functions can be used to
predict fixed and resummed inclusive cross sections to third order in couplings
and in leading logarithmic approximation respectively.
|
[
{
"created": "Tue, 31 Dec 2019 16:20:27 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Feb 2020 11:21:45 GMT",
"version": "v2"
},
{
"created": "Fri, 28 Aug 2020 20:10:24 GMT",
"version": "v3"
},
{
"created": "Wed, 15 May 2024 19:18:28 GMT",
"version": "v4"
}
] |
2024-05-17
|
[
[
"Ajjath",
"A. H.",
""
],
[
"Mukherjee",
"Pooja",
""
],
[
"Ravindran",
"V.",
""
]
] |
We study the infrared (IR) structure of $SU(N) \times U(1)$ (QCD $\times$ QED) gauge theory with $n_f$ quarks and $n_l$ leptons within the framework of perturbation theory. In particular, we unravel the IR structure of the form factors and inclusive real emission cross sections that contribute to inclusive production of color neutral states, such as a pair of leptons or single W/Z in Drell-Yan processes and a Higgs boson in bottom quark annihilation, in Large Hadron Collider (LHC) in the threshold limit. Explicit computation of the relevant form factors to third order and the use of Sudakov's $K+G$ equation in $SU(N)\times U(1)$ gauge theory demonstrate the universality of the cusp anomalous dimensions ($A_I , I = q, b$). The abelianization rules that relate $A_I$ of $SU(N)$ with those from $U(1)$ and $SU(N)\times U(1)$ can be used to predict the soft distribution that results from the soft gluon emission subprocesses in the threshold limit. Using the latter and the third order form factors, we can obtain the collinear anomalous dimensions ($B_I$ ) and the renormalisation constant $Z_b$ to third order in perturbation theory. The form factors, the process independent soft distribution functions can be used to predict fixed and resummed inclusive cross sections to third order in couplings and in leading logarithmic approximation respectively.
|
2007.04927
|
Sachin Shain Poruvelil
|
Jordy de Vries, Alex Gnech, Sachin Shain
|
Strong CP violation in nuclear physics
| null |
Phys. Rev. C 103, 012501 (2021)
|
10.1103/PhysRevC.103.L012501
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Electric dipole moments of nuclei, diamagnetic atoms, and certain molecules
are induced by CP-violating nuclear forces. Naive dimensional analysis predicts
these forces to be dominated by long-range one-pion-exchange processes, with
short-range forces entering only at next-to-next-to-leading order in the chiral
expansion. Based on renormalization arguments we argue that a consistent
picture of CP-violating nuclear forces requires a leading-order short-distance
operator contributing to ${}^1S_0$-${}^3P_0$ transitions, due to the attractive
and singular nature of the strong tensor force in the ${}^3P_0$ channel. The
short-distance operator leads to $\mathcal O(1)$ corrections to static and
oscillating, relevant for axion searches, electric dipole moments. We discuss
strategies how the finite part of the associated low-energy constant can be
determined in the case of CP violation from the QCD theta term by the
connection to charge-symmetry violation in nuclear systems.
|
[
{
"created": "Thu, 9 Jul 2020 17:01:07 GMT",
"version": "v1"
}
] |
2021-02-03
|
[
[
"de Vries",
"Jordy",
""
],
[
"Gnech",
"Alex",
""
],
[
"Shain",
"Sachin",
""
]
] |
Electric dipole moments of nuclei, diamagnetic atoms, and certain molecules are induced by CP-violating nuclear forces. Naive dimensional analysis predicts these forces to be dominated by long-range one-pion-exchange processes, with short-range forces entering only at next-to-next-to-leading order in the chiral expansion. Based on renormalization arguments we argue that a consistent picture of CP-violating nuclear forces requires a leading-order short-distance operator contributing to ${}^1S_0$-${}^3P_0$ transitions, due to the attractive and singular nature of the strong tensor force in the ${}^3P_0$ channel. The short-distance operator leads to $\mathcal O(1)$ corrections to static and oscillating, relevant for axion searches, electric dipole moments. We discuss strategies how the finite part of the associated low-energy constant can be determined in the case of CP violation from the QCD theta term by the connection to charge-symmetry violation in nuclear systems.
|
hep-ph/9909358
|
Thomas Gasenzer
|
T. Gasenzer and O. Nachtmann (Heidelberg U., Germany)
|
Large parity violating effects in atomic dysprosium with nearly
degenerate Floquet eigenvalues
|
Sep 1999, 29pp, 10 Figs
|
Eur.Phys.J. D12 (2000) 95-110
|
10.1007/s100530070044
|
HD-THEP-99-21
|
hep-ph math-ph math.MP physics.atom-ph
| null |
In this article we study effects of parity nonconservation in atomic
dysprosium, where one has a pair of nearly degenerate levels of opposite
parity. We consider the time evolution of this two-level system within
oscillatory electric and magnetic fields. These are chosen to have a periodical
structure with the same period, such that a Floquet matrix describes the time
evolution of the quantum states. We show that, if the states are unstable, the
eigenvalues of the Floquet matrix may have contributions proportional to the
square root of the parity violating interaction matrix element $H_w$ while they
are almost degenerate in their parity even part. This leads to beat frequencies
proportional to $\sqrt{H_w}$ which are expected to be larger by several orders
of magnitude compared to ordinary P-violating contributions which are of order
$H_w$. However, for the simple field configurations we considered, it still
seems to be difficult to observe these P-violating beat effects, since the
states decay too fast. On the other hand, we found that, within only a few
Floquet cycles, very large parity violating asymmetries with respect to
experimental setups of opposite chirality may be obtained. The electric and
magnetic fields as well as the time intervals necessary for this are in an
experimentally accessible range. For statistically significant effects beyond
one standard deviation a number of about $10^7$ atoms is required. Our ideas
may be applied directly to other 2-level atomic systems and different field
configurations. We hope that these ideas will stimulate experimental work in
this direction.
|
[
{
"created": "Tue, 14 Sep 1999 09:30:39 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Gasenzer",
"T.",
"",
"Heidelberg U., Germany"
],
[
"Nachtmann",
"O.",
"",
"Heidelberg U., Germany"
]
] |
In this article we study effects of parity nonconservation in atomic dysprosium, where one has a pair of nearly degenerate levels of opposite parity. We consider the time evolution of this two-level system within oscillatory electric and magnetic fields. These are chosen to have a periodical structure with the same period, such that a Floquet matrix describes the time evolution of the quantum states. We show that, if the states are unstable, the eigenvalues of the Floquet matrix may have contributions proportional to the square root of the parity violating interaction matrix element $H_w$ while they are almost degenerate in their parity even part. This leads to beat frequencies proportional to $\sqrt{H_w}$ which are expected to be larger by several orders of magnitude compared to ordinary P-violating contributions which are of order $H_w$. However, for the simple field configurations we considered, it still seems to be difficult to observe these P-violating beat effects, since the states decay too fast. On the other hand, we found that, within only a few Floquet cycles, very large parity violating asymmetries with respect to experimental setups of opposite chirality may be obtained. The electric and magnetic fields as well as the time intervals necessary for this are in an experimentally accessible range. For statistically significant effects beyond one standard deviation a number of about $10^7$ atoms is required. Our ideas may be applied directly to other 2-level atomic systems and different field configurations. We hope that these ideas will stimulate experimental work in this direction.
|
1107.3260
|
Yithsbey Giraldo
|
Yithsbey Giraldo and William A. Ponce
|
Scalar Potential Without Cubic Term in 3-3-1 Models Without Exotic
Electric Charges
|
19 pages
| null |
10.1140/epjc/s10052-011-1693-3
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A detailed study of the criteria for stability of the scalar potential, and
the proper electroweak symmetry breaking pattern in some 3-3-1 models without
exotic electric charges is presented. In this paper we concentrate in a scalar
sector with three Higgs scalar triplets, with a potential that does not include
the cubic term, due to the presence of a discrete symmetry. For the analysis we
use, and improve, a method previously developed to study the scalar potential
in the two-Higgs-doublet extension of the standard model. Our main result is to
show the consistency of those 3-3-1 models without exotic electric charges.
|
[
{
"created": "Sat, 16 Jul 2011 22:16:10 GMT",
"version": "v1"
}
] |
2015-05-28
|
[
[
"Giraldo",
"Yithsbey",
""
],
[
"Ponce",
"William A.",
""
]
] |
A detailed study of the criteria for stability of the scalar potential, and the proper electroweak symmetry breaking pattern in some 3-3-1 models without exotic electric charges is presented. In this paper we concentrate in a scalar sector with three Higgs scalar triplets, with a potential that does not include the cubic term, due to the presence of a discrete symmetry. For the analysis we use, and improve, a method previously developed to study the scalar potential in the two-Higgs-doublet extension of the standard model. Our main result is to show the consistency of those 3-3-1 models without exotic electric charges.
|
hep-ph/0211190
|
Masanori Hirai
|
M. Hirai (Asymmetry Analysis Collaboration)
|
Recent status of polarized parton distributions
|
5 pages, 4 figures, aipproc.cls, aipxfm.sty, fix2col.sty,
aip-arlo.clo, aip-6s.clo, aip-8d.clo, aip-8s.clo. Talk given at SPIN 2002,
Brookhaven National Laboratory, September 9-13, 2002, To appear in the
Proceedings
| null |
10.1063/1.1607160
| null |
hep-ph
| null |
We study an influence of precise data on uncertainty of polarized parton
distribution functions. This analysis includes the SLAC-E155 proton target data
which are precise measurements. Polarized PDF uncertainties are estimated by
using the Hessian matrix. We examine correlation effect between the antiquark
and gluon uncertainties. It suggests that reducing the gluon uncertainty is
needed to determine the polarized antiquark distribution clearly.
|
[
{
"created": "Wed, 13 Nov 2002 05:49:50 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Hirai",
"M.",
"",
"Asymmetry Analysis Collaboration"
]
] |
We study an influence of precise data on uncertainty of polarized parton distribution functions. This analysis includes the SLAC-E155 proton target data which are precise measurements. Polarized PDF uncertainties are estimated by using the Hessian matrix. We examine correlation effect between the antiquark and gluon uncertainties. It suggests that reducing the gluon uncertainty is needed to determine the polarized antiquark distribution clearly.
|
hep-ph/9506459
| null |
Howard Baer, Michal Brhlik, Ray Munroe and Xerxes Tata
|
Prospects for Supersymmetry at LEP2
|
22 page REVTEX file + 9 uuencoded figures; a uuencoded PS file with
PS figures is available via anonymous ftp at
ftp://hep.fsu.edu/preprints/baer/FSUHEP950501.uu
|
Phys.Rev.D52:5031-5044,1995
|
10.1103/PhysRevD.52.5031
|
FSU-HEP-950501, UH-511-829-95
|
hep-ph
| null |
Working within the framework of the minimal supergravity model with gauge
coupling unification and radiative electroweak symmetry breaking (SUGRA), we
map out regions of parameter space explorable by experiments at LEP2, for
center of mass energy options of $\sqrt{s}=150,\ 175$, $190$ and 205 GeV. We
compute signals from all accessible $2 \rightarrow 2$ SUSY pair production
processes using the ISAJET simulation program, and devise cuts that enhance the
signal relative to Standard Model backgrounds, and which also serve to
differentiate various supersymmetric processes from one another. We delineate
regions of SUGRA parameter space where production of neutralino pairs, chargino
pairs, slepton pairs and the production of the light Higgs scalar of SUSY is
detectable above Standard Model backgrounds and distinguishable from other SUSY
processes. In addition, we find small regions of SUGRA parameter space where
$\te\te$, $\tz_2\tz_2$ and $\tnu_L\tnu_L$ production yields spectacular events
with up to four isolated leptons. The combined regions of parameter space
explorable by LEP2 are compared with the reach of Tevatron Main Injector era
experiments. Finally, we comment on how the reach via the neutralino pair
channel is altered when the radiative electroweak symmetry breaking constraint
is relaxed.
|
[
{
"created": "Thu, 29 Jun 1995 19:05:15 GMT",
"version": "v1"
}
] |
2009-02-11
|
[
[
"Baer",
"Howard",
""
],
[
"Brhlik",
"Michal",
""
],
[
"Munroe",
"Ray",
""
],
[
"Tata",
"Xerxes",
""
]
] |
Working within the framework of the minimal supergravity model with gauge coupling unification and radiative electroweak symmetry breaking (SUGRA), we map out regions of parameter space explorable by experiments at LEP2, for center of mass energy options of $\sqrt{s}=150,\ 175$, $190$ and 205 GeV. We compute signals from all accessible $2 \rightarrow 2$ SUSY pair production processes using the ISAJET simulation program, and devise cuts that enhance the signal relative to Standard Model backgrounds, and which also serve to differentiate various supersymmetric processes from one another. We delineate regions of SUGRA parameter space where production of neutralino pairs, chargino pairs, slepton pairs and the production of the light Higgs scalar of SUSY is detectable above Standard Model backgrounds and distinguishable from other SUSY processes. In addition, we find small regions of SUGRA parameter space where $\te\te$, $\tz_2\tz_2$ and $\tnu_L\tnu_L$ production yields spectacular events with up to four isolated leptons. The combined regions of parameter space explorable by LEP2 are compared with the reach of Tevatron Main Injector era experiments. Finally, we comment on how the reach via the neutralino pair channel is altered when the radiative electroweak symmetry breaking constraint is relaxed.
|
hep-ph/0506021
|
Karol Kovarik
|
K. Kovarik, C. Weber, H. Eberl, W. Majerotto
|
Full O(alpha) corrections to e+e- -> sf_i sf_j
|
32 pages, 24 figures, RevTeX4
|
Phys.Rev. D72 (2005) 053010
|
10.1103/PhysRevD.72.053010
|
HEPHY-PUB 807/05
|
hep-ph
| null |
We present a complete precision analysis of the sfermion pair production
process e+e- -> sf_i sf_j (f = t, b, tau, nu_tau) in the Minimal Supersymmetric
Standard Model. Our results extend the previously calculated weak corrections
by including all one-loop corrections together with higher order QED
corrections. We present the details of the analytical calculation and discuss
the renormalization scheme. The numerical analysis shows the results for total
cross-sections, forward-backward and left-right asymmetries. It is based on the
SPS1a' point from the SPA project. The complete corrections are about 10% and
have to be taken into account in a high precision analysis.
|
[
{
"created": "Fri, 3 Jun 2005 09:05:39 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Kovarik",
"K.",
""
],
[
"Weber",
"C.",
""
],
[
"Eberl",
"H.",
""
],
[
"Majerotto",
"W.",
""
]
] |
We present a complete precision analysis of the sfermion pair production process e+e- -> sf_i sf_j (f = t, b, tau, nu_tau) in the Minimal Supersymmetric Standard Model. Our results extend the previously calculated weak corrections by including all one-loop corrections together with higher order QED corrections. We present the details of the analytical calculation and discuss the renormalization scheme. The numerical analysis shows the results for total cross-sections, forward-backward and left-right asymmetries. It is based on the SPS1a' point from the SPA project. The complete corrections are about 10% and have to be taken into account in a high precision analysis.
|
1307.0701
|
Felix Ringer
|
Daniele P. Anderle, Felix Ringer, Werner Vogelsang
|
QCD resummation in hadron production
|
Contribution to proceedings of 3rd Workshop on the QCD Structure of
the Nucleon (QCD-N'12)
| null |
10.1393/ncc/i2013-11596-0
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present calculations of next-to-leading order and resummed QCD corrections
for semi-inclusive deep-inelastic scattering and single-inclusive e+e-
annihilation. The resummation is performed to next-to-leading logarithmic
accuracy. Knowing these QCD corrections is important in order to extract parton
distribution functions and fragmentation functions from present and future data
for these reactions. We present comparisons of our results to recent data by
the COMPASS, HERMES, Belle, and BaBar experiments.
|
[
{
"created": "Tue, 2 Jul 2013 13:32:17 GMT",
"version": "v1"
}
] |
2022-03-02
|
[
[
"Anderle",
"Daniele P.",
""
],
[
"Ringer",
"Felix",
""
],
[
"Vogelsang",
"Werner",
""
]
] |
We present calculations of next-to-leading order and resummed QCD corrections for semi-inclusive deep-inelastic scattering and single-inclusive e+e- annihilation. The resummation is performed to next-to-leading logarithmic accuracy. Knowing these QCD corrections is important in order to extract parton distribution functions and fragmentation functions from present and future data for these reactions. We present comparisons of our results to recent data by the COMPASS, HERMES, Belle, and BaBar experiments.
|
2208.05859
|
Jiaming Zheng
|
Yann Mambrini, Keith A. Olive, Jiaming Zheng
|
Post-Inflationary Dark Matter Bremsstrahlung
|
19 pages, 5 figures
|
JCAP 10 (2022) 055
|
10.1088/1475-7516/2022/10/055
|
UMN-TH-4129/22;FTPI-MINN-22/20
|
hep-ph astro-ph.CO
|
http://creativecommons.org/licenses/by/4.0/
|
Dark matter may only interact with the visible sector efficiently at energy
scales above the inflaton mass, such as the Planck scale or the grand
unification scale. In such a scenario, the dark matter is mainly produced out
of equilibrium during the period of reheating, often referred to as UV
freeze-in. We evaluate the abundance of the dark matter generated from
bremsstrahlung off the inflaton decay products assuming no direct coupling
between the inflaton and the dark matter. This process generally dominates the
production of dark matter for low reheating temperatures where the production
through the annihilations of particle in the thermal plasma becomes
inefficient. We find that the bremsstrahlung process dominates for reheating
temperatures $T_{\mathrm{RH}} \lesssim 10^{10}$ GeV, and produces the requisite
density of dark matter for a UV scale $\simeq 10^{16}$ GeV. As examples, we
calculate numerically the yield of the dark matter bremsstrahlung through
gravitation and dimension-6 vector portal effective interactions.
|
[
{
"created": "Thu, 11 Aug 2022 15:04:30 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Oct 2022 16:52:27 GMT",
"version": "v2"
}
] |
2022-10-31
|
[
[
"Mambrini",
"Yann",
""
],
[
"Olive",
"Keith A.",
""
],
[
"Zheng",
"Jiaming",
""
]
] |
Dark matter may only interact with the visible sector efficiently at energy scales above the inflaton mass, such as the Planck scale or the grand unification scale. In such a scenario, the dark matter is mainly produced out of equilibrium during the period of reheating, often referred to as UV freeze-in. We evaluate the abundance of the dark matter generated from bremsstrahlung off the inflaton decay products assuming no direct coupling between the inflaton and the dark matter. This process generally dominates the production of dark matter for low reheating temperatures where the production through the annihilations of particle in the thermal plasma becomes inefficient. We find that the bremsstrahlung process dominates for reheating temperatures $T_{\mathrm{RH}} \lesssim 10^{10}$ GeV, and produces the requisite density of dark matter for a UV scale $\simeq 10^{16}$ GeV. As examples, we calculate numerically the yield of the dark matter bremsstrahlung through gravitation and dimension-6 vector portal effective interactions.
|
1510.04442
|
Vedat Nefer \c{S}eno\u{g}uz
|
Vedat Nefer \c{S}eno\u{g}uz and Qaisar Shafi
|
Primordial monopoles, proton decay, gravity waves and GUT inflation
|
1+11 pages, 2 figures, 2 tables. v2: minor typos fixed, matches
published version
|
Physics Letters B 752 (2016) 169
|
10.1016/j.physletb.2015.11.037
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider non-supersymmetric GUT inflation models in which intermediate
mass monopoles may survive inflation because of the restricted number of
e-foldings experienced by the accompanying symmetry breaking. Thus, an
observable flux of primordial magnetic monopoles, comparable to or a few orders
below the Parker limit, may be present in the galaxy. The mass scale associated
with the intermediate symmetry breaking is $10^{13}$ GeV for an observable flux
level, with the corresponding monopoles an order of magnitude or so heavier.
Examples based on $SO(10)$ and $E_6$ yield such intermediate mass monopoles
carrying respectively two and three units of Dirac magnetic charge. For GUT
inflation driven by a gauge singlet scalar field with a Coleman-Weinberg or
Higgs potential, compatibility with the Planck measurement of the scalar
spectral index yields a Hubble constant (during horizon exit of cosmological
scales) $H \sim 7$--$9\times10^{13}$ GeV, with the tensor to scalar ratio $r$
predicted to be $\gtrsim0.02$. Proton lifetime estimates for decays mediated by
the superheavy gauge bosons are also provided.
|
[
{
"created": "Thu, 15 Oct 2015 08:22:10 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Dec 2015 09:13:01 GMT",
"version": "v2"
}
] |
2015-12-08
|
[
[
"Şenoğuz",
"Vedat Nefer",
""
],
[
"Shafi",
"Qaisar",
""
]
] |
We consider non-supersymmetric GUT inflation models in which intermediate mass monopoles may survive inflation because of the restricted number of e-foldings experienced by the accompanying symmetry breaking. Thus, an observable flux of primordial magnetic monopoles, comparable to or a few orders below the Parker limit, may be present in the galaxy. The mass scale associated with the intermediate symmetry breaking is $10^{13}$ GeV for an observable flux level, with the corresponding monopoles an order of magnitude or so heavier. Examples based on $SO(10)$ and $E_6$ yield such intermediate mass monopoles carrying respectively two and three units of Dirac magnetic charge. For GUT inflation driven by a gauge singlet scalar field with a Coleman-Weinberg or Higgs potential, compatibility with the Planck measurement of the scalar spectral index yields a Hubble constant (during horizon exit of cosmological scales) $H \sim 7$--$9\times10^{13}$ GeV, with the tensor to scalar ratio $r$ predicted to be $\gtrsim0.02$. Proton lifetime estimates for decays mediated by the superheavy gauge bosons are also provided.
|
2304.13418
|
Mao Zeng
|
Kirill Mokrov, Alexander Smirnov, Mao Zeng
|
Rational Function Simplification for Integration-by-Parts Reduction and
Beyond
|
19 pages, 2 figure, 6 tables. v2 update: significant enhancements to
the code
|
Numerical Methods and Programming 24(4) 352-367 (2023)
|
10.26089/NumMet.v24r425
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We present FUEL (Fractional Universal Evaluation Library), a C++ library for
performing rational function arithmetic with a flexible choice of third-party
computer algebra systems as simplifiers. FUEL is an outgrowth of a C++
interface to Fermat which was originally part of the FIRE code for
integration-by-parts (IBP) reduction for Feynman integrals, now promoted to be
a standalone library and with access to simplifiers other than Fermat. We
compare the performance of various simplifiers for standalone benchmark
problems as well as IBP reduction runs with FIRE. A speedup of more than 10
times is achieved for an example IBP problem related to off-shell
three-particle form factors in $\mathcal N=4$ super-Yang-Mills theory.
|
[
{
"created": "Wed, 26 Apr 2023 09:58:11 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Oct 2023 15:57:33 GMT",
"version": "v2"
}
] |
2023-10-24
|
[
[
"Mokrov",
"Kirill",
""
],
[
"Smirnov",
"Alexander",
""
],
[
"Zeng",
"Mao",
""
]
] |
We present FUEL (Fractional Universal Evaluation Library), a C++ library for performing rational function arithmetic with a flexible choice of third-party computer algebra systems as simplifiers. FUEL is an outgrowth of a C++ interface to Fermat which was originally part of the FIRE code for integration-by-parts (IBP) reduction for Feynman integrals, now promoted to be a standalone library and with access to simplifiers other than Fermat. We compare the performance of various simplifiers for standalone benchmark problems as well as IBP reduction runs with FIRE. A speedup of more than 10 times is achieved for an example IBP problem related to off-shell three-particle form factors in $\mathcal N=4$ super-Yang-Mills theory.
|
1012.3332
|
Samuel Wallon
|
C.Marquet, C.Roiesnel and S.Wallon
|
Virtual Compton Scattering off a Spinless Target in the AdS/QCD
correspondence
|
5 pages, to appear in the proceedings of 35th International
Conference on High Energy Physics, (ICHEP 2010), Paris, France, July 22-28,
2010
| null | null |
CPHT-PC108.1210, LPT-ORSAY-10-93
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a study of the doubly virtual Compton scattering off a spinless
target gamma* P -> gamma* P' within the Anti-de Sitter(AdS)/QCD formalism. We
find that the general structure allowed by the Lorentz invariance and gauge
invariance of the Compton amplitude is not easily reproduced with the standard
recipes of the AdS/QCD correspondence. In the soft-photon regime, where the
semi-classical approximation is supposed to apply best, we show that the
measurements of the electric and magnetic polarizabilities of a target like the
charged pion in real Compton scattering, can already serve as stringent tests,
and presumably exclude results based on the AdS/QCD correspondence in its
minimal version.
|
[
{
"created": "Wed, 15 Dec 2010 13:48:16 GMT",
"version": "v1"
}
] |
2010-12-16
|
[
[
"Marquet",
"C.",
""
],
[
"Roiesnel",
"C.",
""
],
[
"Wallon",
"S.",
""
]
] |
We perform a study of the doubly virtual Compton scattering off a spinless target gamma* P -> gamma* P' within the Anti-de Sitter(AdS)/QCD formalism. We find that the general structure allowed by the Lorentz invariance and gauge invariance of the Compton amplitude is not easily reproduced with the standard recipes of the AdS/QCD correspondence. In the soft-photon regime, where the semi-classical approximation is supposed to apply best, we show that the measurements of the electric and magnetic polarizabilities of a target like the charged pion in real Compton scattering, can already serve as stringent tests, and presumably exclude results based on the AdS/QCD correspondence in its minimal version.
|
hep-ph/0510210
|
Ho-Meoyng Choi
|
Chueng-Ryong Ji, Bernard.L. G. Bakker, and Ho-Meoyng Choi
|
Revealing treacherous points for successful light-front phenomenological
applications
|
6 pages; requires espcrc2.sty; to appear in the proceedings of
Workshop on Light-Cone QCD and Nonperturbative Hadron Physics 2005 (LC 2005),
Cairns, Queensland, Australia, 7-15 Jul 2005
| null |
10.1016/j.nuclphysbps.2006.08.011
| null |
hep-ph
| null |
Light-front dynamics(LFD) plays an important role in hadron phenomenology as
evidenced from recent development of generalized parton distributions and other
quantities involving hadrons. For successful LFD applications to hadron
phenomenology, however, treacherous points such as zero-mode contributions
should be taken into account. For a concrete example of zero-mode contribution,
we present Standard Model analysis of vector anomaly in the CP-even form
factors of W^{\pm} gauge bosons. Main distinguished features of LFD is
discussed in comparison with other Hamiltonian dynamics. We also present a
power counting method to correctly pin down which hadron form factors receive
the zero-mode contribution and which ones do not. Indications from our analysis
to hadron phenomenology are discussed.
|
[
{
"created": "Sun, 16 Oct 2005 10:59:06 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Ji",
"Chueng-Ryong",
""
],
[
"Bakker",
"Bernard. L. G.",
""
],
[
"Choi",
"Ho-Meoyng",
""
]
] |
Light-front dynamics(LFD) plays an important role in hadron phenomenology as evidenced from recent development of generalized parton distributions and other quantities involving hadrons. For successful LFD applications to hadron phenomenology, however, treacherous points such as zero-mode contributions should be taken into account. For a concrete example of zero-mode contribution, we present Standard Model analysis of vector anomaly in the CP-even form factors of W^{\pm} gauge bosons. Main distinguished features of LFD is discussed in comparison with other Hamiltonian dynamics. We also present a power counting method to correctly pin down which hadron form factors receive the zero-mode contribution and which ones do not. Indications from our analysis to hadron phenomenology are discussed.
|
hep-ph/0502106
|
Pankaj Jain
|
Pankaj Jain and John P. Ralston
|
Supersymmetry and the Lorentz Fine Tuning Problem
|
9 pages, 1 figure
|
Phys.Lett. B621 (2005) 213-218
|
10.1016/j.physletb.2005.06.055
| null |
hep-ph gr-qc hep-th
| null |
If physics at the Planck scale requires new conceptions of space-time, then
generic renormalizable field theories predict observable violations of Lorentz
invariance in the low energy sector. The little recognized ``Lorentz Fine
Tuning Problem'' comes from logarithmic loop corrections which are not
suppressed to the enormous extent commonly assumed. Fine-tuning of parameters
at the Planck scale is one possible but unpalatable solution. Here we show that
violation of Lorentz invariance is highly suppressed in a supersymmetric
theory, the Wess-Zumino model. We conjecture that supersymmetry may be further
motivated by yet another fine tuning problem of ordinary quantum field
theories.
|
[
{
"created": "Fri, 11 Feb 2005 09:47:32 GMT",
"version": "v1"
},
{
"created": "Thu, 19 May 2005 03:56:20 GMT",
"version": "v2"
}
] |
2010-04-05
|
[
[
"Jain",
"Pankaj",
""
],
[
"Ralston",
"John P.",
""
]
] |
If physics at the Planck scale requires new conceptions of space-time, then generic renormalizable field theories predict observable violations of Lorentz invariance in the low energy sector. The little recognized ``Lorentz Fine Tuning Problem'' comes from logarithmic loop corrections which are not suppressed to the enormous extent commonly assumed. Fine-tuning of parameters at the Planck scale is one possible but unpalatable solution. Here we show that violation of Lorentz invariance is highly suppressed in a supersymmetric theory, the Wess-Zumino model. We conjecture that supersymmetry may be further motivated by yet another fine tuning problem of ordinary quantum field theories.
|
1306.1790
|
Dan Hooper
|
Dan Hooper
|
Revisiting XENON100's Constraints (and Signals?) For Low-Mass Dark
Matter
|
11 pages, 6 figures
| null |
10.1088/1475-7516/2013/09/035
|
FERMILAB-PUB-13-188-A
|
hep-ph astro-ph.CO astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Although observations made with the CoGeNT and CDMS experiments have been
interpreted as possible signals of low-mass (~7-10 GeV) dark matter particles,
constraints from the XENON100 collaboration appear to be incompatible with this
hypothesis, at least at face value. In this paper, we revisit XENON100's
constraint on dark matter in this mass range, and consider how various
uncertainties and assumptions made might alter this conclusion. We also note
that while XENON100's two nuclear recoil candidates each exhibit very low
ratios of ionization-to-scintillation signals, making them difficult to
attribute to known electronic or neutron backgrounds, they are consistent with
originating from dark matter particles in the mass range favored by CoGeNT and
CDMS. We argue that with lower, but not implausible, values for the relative
scintillation efficiency of liquid xenon (L_eff), and the suppression of the
scintillation signal in liquid xenon at XENON100's electric field (S_nr), these
two events could consistently arise from dark matter particles with a mass and
cross section in the range favored by CoGeNT and CDMS. If this interpretation
is correct, we predict that the LUX experiment, with a significantly higher
light yield than XENON100, should observe dark matter induced events at an
observable rate of ~3-24 per month.
|
[
{
"created": "Fri, 7 Jun 2013 17:46:48 GMT",
"version": "v1"
}
] |
2015-06-16
|
[
[
"Hooper",
"Dan",
""
]
] |
Although observations made with the CoGeNT and CDMS experiments have been interpreted as possible signals of low-mass (~7-10 GeV) dark matter particles, constraints from the XENON100 collaboration appear to be incompatible with this hypothesis, at least at face value. In this paper, we revisit XENON100's constraint on dark matter in this mass range, and consider how various uncertainties and assumptions made might alter this conclusion. We also note that while XENON100's two nuclear recoil candidates each exhibit very low ratios of ionization-to-scintillation signals, making them difficult to attribute to known electronic or neutron backgrounds, they are consistent with originating from dark matter particles in the mass range favored by CoGeNT and CDMS. We argue that with lower, but not implausible, values for the relative scintillation efficiency of liquid xenon (L_eff), and the suppression of the scintillation signal in liquid xenon at XENON100's electric field (S_nr), these two events could consistently arise from dark matter particles with a mass and cross section in the range favored by CoGeNT and CDMS. If this interpretation is correct, we predict that the LUX experiment, with a significantly higher light yield than XENON100, should observe dark matter induced events at an observable rate of ~3-24 per month.
|
hep-ph/9503205
|
Yuval Kluger
|
Y. Kluger, F. Cooper, E. Mottola, J.P. Paz and A. Kovner
|
Quantum evolution of the disoriented chiral condensates
|
4 pages, uuencoded and gziped ps-file, talk presented at Quark Matter
'95, Monterey, CA, USA, January 1995
|
Nucl.Phys. A590 (1995) 581c-584c
|
10.1016/0375-9474(95)00282-6
|
LBL-36904
|
hep-ph
| null |
We study the dynamics of the chiral phase transition expected during the
expansion of the quark-gluon plasma produced in a high energy hadron or heavy
ion collision, using the $O(4)$ linear sigma model in the mean field
approximation. Imposing boost invariant initial conditions at an initial proper
time $\tau_0$ and starting from an approximate equilibrium configuration, we
investigate the possibility of formation of disoriented chiral condensate
during the expansion. In order to create large domains of disoriented chiral
condensates low-momentum instabilities have to last for long enough periods of
time. Our simulations show no instabilities for an initial thermal
configuration. For some of the out-of-equilibrium initial states studied, the
fluctuation in the number of particles with low transverse momenta become large
at late proper times.
|
[
{
"created": "Thu, 2 Mar 1995 00:52:36 GMT",
"version": "v1"
}
] |
2016-09-01
|
[
[
"Kluger",
"Y.",
""
],
[
"Cooper",
"F.",
""
],
[
"Mottola",
"E.",
""
],
[
"Paz",
"J. P.",
""
],
[
"Kovner",
"A.",
""
]
] |
We study the dynamics of the chiral phase transition expected during the expansion of the quark-gluon plasma produced in a high energy hadron or heavy ion collision, using the $O(4)$ linear sigma model in the mean field approximation. Imposing boost invariant initial conditions at an initial proper time $\tau_0$ and starting from an approximate equilibrium configuration, we investigate the possibility of formation of disoriented chiral condensate during the expansion. In order to create large domains of disoriented chiral condensates low-momentum instabilities have to last for long enough periods of time. Our simulations show no instabilities for an initial thermal configuration. For some of the out-of-equilibrium initial states studied, the fluctuation in the number of particles with low transverse momenta become large at late proper times.
|
hep-ph/9810522
|
Jochen Biebel
|
Jochen Biebel
|
Seeking CP Violating Couplings in ZZ Production at LEP2
|
6 pages, Latex, 1 figure
|
Phys.Lett. B448 (1999) 125-128
|
10.1016/S0370-2693(98)01589-5
|
DESY 98-163
|
hep-ph
| null |
The effects of CP violating anomalous ZZZ and gammaZZ vertices in ZZ
production are determined. We present the differential cross-section for e+e-
-> ZZ with dependence on the spins of the Z bosons. It is shown that from the
different spin combinations those with one longitudinally and one transversally
polarized Z in the final state are the most sensitive to CP violating anomalous
couplings.
|
[
{
"created": "Thu, 29 Oct 1998 14:00:55 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Biebel",
"Jochen",
""
]
] |
The effects of CP violating anomalous ZZZ and gammaZZ vertices in ZZ production are determined. We present the differential cross-section for e+e- -> ZZ with dependence on the spins of the Z bosons. It is shown that from the different spin combinations those with one longitudinally and one transversally polarized Z in the final state are the most sensitive to CP violating anomalous couplings.
|
1212.0459
|
Yaroslav Klopot
|
Yaroslav Klopot, Armen Oganesian, Oleg Teryaev
|
Axial Anomaly and Light Cone Distributions
|
6 pages, 2 figures. Presented by the first author at Light Cone 2012,
8-13 July 2012, Cracow, Poland. v2: typos corrected, reference added
|
Acta Phys.Polon.Supp. 6 (2013) 145-150
|
10.5506/APhysPolBSupp.6.145
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Axial anomaly leads to exact sum rules for transition form factors providing
the important constraints to respective distribution amplitudes. This rigorous
NPQCD approach is valid even if QCD factorization is broken. The status of
possible small non-OPE corrections to continuum in comparison to BABAR and
BELLE data is discussed.
|
[
{
"created": "Mon, 3 Dec 2012 17:34:32 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Feb 2013 18:03:05 GMT",
"version": "v2"
}
] |
2013-04-04
|
[
[
"Klopot",
"Yaroslav",
""
],
[
"Oganesian",
"Armen",
""
],
[
"Teryaev",
"Oleg",
""
]
] |
Axial anomaly leads to exact sum rules for transition form factors providing the important constraints to respective distribution amplitudes. This rigorous NPQCD approach is valid even if QCD factorization is broken. The status of possible small non-OPE corrections to continuum in comparison to BABAR and BELLE data is discussed.
|
hep-ph/9409230
| null |
Andrei L. Kataev
|
Higher-order QCD corrections to deep-inelastic sum rules
|
CERN-TH.7427/94; LATEX, 5 pages; Invited talk at the 27th Int.
Conference on HE Physics, Glasgow, Scotland, UK, 20-27 July 1994, shortened
version to be published in the ICHEP'27 Proceedings
| null | null | null |
hep-ph
| null |
The brief review of the current status of the studies of the effects of the
higher-order perturbative QCD corrections to the deep-inelastic sum rules is
presented.
|
[
{
"created": "Tue, 6 Sep 1994 13:41:20 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kataev",
"Andrei L.",
""
]
] |
The brief review of the current status of the studies of the effects of the higher-order perturbative QCD corrections to the deep-inelastic sum rules is presented.
|
1706.09022
|
Nicolas Greiner
|
Mauro Chiesa, Nicolas Greiner, Marek Schoenherr, Francesco Tramontano
|
Electroweak corrections to diphoton plus jets
|
19 pages, 11 figure, 1 table
| null |
10.1007/JHEP10(2017)181
|
ZU--TH 20/17 MCNET--17--11
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the next-to-leading order electroweak corrections to the
production of a photon pair in association with zero, one and two jets at the
LHC. We use GoSam and Sherpa to obtain the results in a fully automated way.
For a typical set of fiducial cuts the electroweak corrections lead to a
modification of the total cross section of up to 3 per cent, depending on the
jet multiplicity. We find substantial contributions in differential
distributions, leading to tens of per cent corrections for phase space regions
within the reach of the LHC. Furthermore we investigate the importance of
photon induced processes as well as subleading contributions. Photon induced
processes are found to be negligible, subleading contributions can have a
sizeable impact however they can be removed by appropriate phase space cuts.
|
[
{
"created": "Tue, 27 Jun 2017 19:25:23 GMT",
"version": "v1"
}
] |
2017-12-06
|
[
[
"Chiesa",
"Mauro",
""
],
[
"Greiner",
"Nicolas",
""
],
[
"Schoenherr",
"Marek",
""
],
[
"Tramontano",
"Francesco",
""
]
] |
We calculate the next-to-leading order electroweak corrections to the production of a photon pair in association with zero, one and two jets at the LHC. We use GoSam and Sherpa to obtain the results in a fully automated way. For a typical set of fiducial cuts the electroweak corrections lead to a modification of the total cross section of up to 3 per cent, depending on the jet multiplicity. We find substantial contributions in differential distributions, leading to tens of per cent corrections for phase space regions within the reach of the LHC. Furthermore we investigate the importance of photon induced processes as well as subleading contributions. Photon induced processes are found to be negligible, subleading contributions can have a sizeable impact however they can be removed by appropriate phase space cuts.
|
1903.10954
|
Valerio Gherardi
|
Valerio Gherardi, David Marzocca, Marco Nardecchia, Andrea Romanino
|
Rank-One Flavor Violation and B-meson anomalies
|
30 pages, 8 figures, 8 tables. v2: additional bounds included,
references added. v3: updated with latest results on $K_S \to \mu^+ \mu^-$
from LHCb and $K^+ \to \pi^+ \nu \bar\nu$ from NA62
| null |
10.1007/JHEP10(2019)112
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We assume that the quark-flavor coefficients matrix of the semileptonic
operators addressing the neutral-current B-meson anomalies has rank-one, i.e.
it can be described by a single vector in quark-flavor space. By correlating
the observed anomalies to other flavor and high-$p_T$ observables, we constrain
its possible directions and we show that a large region of the parameter space
of this framework will be explored by flavor data from the NA62, KOTO, LHCb and
Belle II experiments.
|
[
{
"created": "Tue, 26 Mar 2019 15:22:11 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Apr 2019 15:33:51 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Sep 2019 15:19:23 GMT",
"version": "v3"
}
] |
2020-01-08
|
[
[
"Gherardi",
"Valerio",
""
],
[
"Marzocca",
"David",
""
],
[
"Nardecchia",
"Marco",
""
],
[
"Romanino",
"Andrea",
""
]
] |
We assume that the quark-flavor coefficients matrix of the semileptonic operators addressing the neutral-current B-meson anomalies has rank-one, i.e. it can be described by a single vector in quark-flavor space. By correlating the observed anomalies to other flavor and high-$p_T$ observables, we constrain its possible directions and we show that a large region of the parameter space of this framework will be explored by flavor data from the NA62, KOTO, LHCb and Belle II experiments.
|
1212.1708
|
Sudhir Kumar Gupta Dr
|
Csaba Bal\'azs and Sudhir Kumar Gupta
|
Peccei-Quinn violating minimal supergravity and a 126 GeV Higgs
|
9 LaTeX page, 5 Figures, 2 Tables, accepted version for publication
in Physical Review D
|
Phys.Rev. D87 (2013) 035023
|
10.1103/PhysRevD.87.035023
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In a Peccei-Quinn extension of supergravity the h --> \gamma\gamma detection
rate can be significantly enhanced due to the reduction of the total Higgs
decay width. To assess the viability of various Peccei-Quinn extensions of
minimal supergravity we perform a Bayesian analysis on three such scenarios.
The main constraints on these models come from the currently observed Higgs
boson like state by the Large Hadron Collider and from the WMAP observation of
dark matter abundance. Our comparative study reveals that under these
constraints the PQ violating scenarios with axino dark matter are clearly
preferred over the minimal supegravity model with the lightest neutralino as a
dark matter candidate.
|
[
{
"created": "Fri, 7 Dec 2012 20:56:16 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Mar 2013 03:42:17 GMT",
"version": "v2"
}
] |
2013-04-11
|
[
[
"Balázs",
"Csaba",
""
],
[
"Gupta",
"Sudhir Kumar",
""
]
] |
In a Peccei-Quinn extension of supergravity the h --> \gamma\gamma detection rate can be significantly enhanced due to the reduction of the total Higgs decay width. To assess the viability of various Peccei-Quinn extensions of minimal supergravity we perform a Bayesian analysis on three such scenarios. The main constraints on these models come from the currently observed Higgs boson like state by the Large Hadron Collider and from the WMAP observation of dark matter abundance. Our comparative study reveals that under these constraints the PQ violating scenarios with axino dark matter are clearly preferred over the minimal supegravity model with the lightest neutralino as a dark matter candidate.
|
1204.6604
|
Bo-Qiang Ma
|
Xinyi Zhang, Bo-Qiang Ma
|
On the CP-violating phase $\delta_{\rm CP}$ in fermion mixing matrices
|
10 pages, 6 figures, 3 tables. Numerical results improved
|
The Universe 1-1 (2013) 16-28
| null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The recent established large $\theta_{13}$ in neutrino mixing provides an
optimistic possibility for the investigation of the CP violation, therefore it
is necessary to study the CP-violating phase $\delta_{\rm CP}$ in detail. Based
on the maximal CP violation hypothesis in the original Kobayashi-Maskawa (KM)
scheme of neutrino mixing matrix, i.e., $\delta_{\rm KM}=90^\circ$, we
calculate $\delta_{\rm CK}$ for both quarks and leptons in the Chau-Keung (CK)
scheme of the standard parametrization and find that
$\delta^{\mathrm{quark}}_{\mathrm{CK}}=(68.62^{+0.89}_{-0.81})^\circ$ and
$\delta^{\mathrm{lepton}}_{\mathrm{CK}}=(85.39^{+4.76}_{-1.82})^\circ$,
provided with three mixing angles to be given. We also examine the sensitivity
of $|V_{ij}|$ and $|U_{ij}|$ to $\delta_{\rm CK}$ and $\delta_{\rm KM}$. As a
convention-independent investigation, we discuss the $\Phi$ matrix, which has
elements correspond to angles of the unitarity triangles. We demonstrate the
$\Phi$ matrices for both quark and lepton sectors and discuss the implications
as well as the variations of the $\Phi$ matrix elements with $\delta_{\rm CP}$.
|
[
{
"created": "Mon, 30 Apr 2012 11:47:14 GMT",
"version": "v1"
},
{
"created": "Thu, 24 May 2012 04:47:59 GMT",
"version": "v2"
}
] |
2014-10-31
|
[
[
"Zhang",
"Xinyi",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] |
The recent established large $\theta_{13}$ in neutrino mixing provides an optimistic possibility for the investigation of the CP violation, therefore it is necessary to study the CP-violating phase $\delta_{\rm CP}$ in detail. Based on the maximal CP violation hypothesis in the original Kobayashi-Maskawa (KM) scheme of neutrino mixing matrix, i.e., $\delta_{\rm KM}=90^\circ$, we calculate $\delta_{\rm CK}$ for both quarks and leptons in the Chau-Keung (CK) scheme of the standard parametrization and find that $\delta^{\mathrm{quark}}_{\mathrm{CK}}=(68.62^{+0.89}_{-0.81})^\circ$ and $\delta^{\mathrm{lepton}}_{\mathrm{CK}}=(85.39^{+4.76}_{-1.82})^\circ$, provided with three mixing angles to be given. We also examine the sensitivity of $|V_{ij}|$ and $|U_{ij}|$ to $\delta_{\rm CK}$ and $\delta_{\rm KM}$. As a convention-independent investigation, we discuss the $\Phi$ matrix, which has elements correspond to angles of the unitarity triangles. We demonstrate the $\Phi$ matrices for both quark and lepton sectors and discuss the implications as well as the variations of the $\Phi$ matrix elements with $\delta_{\rm CP}$.
|
2011.09685
|
Vladimir Kuksa
|
Vitaly Beylin, Vladimir Kuksa
|
On the reactions involving neutrinos and hidden mass particles in
hypercolor model
|
20 pages, prepared for Proceeding of XXIII Bled Workshop "What Comes
Beyond the Standard Model?" Bled, Julay 4-12, 2020
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We present and discuss some basic elements of the Standard Model hypercolor
extension. Appearance of a set of hyperquarks bound states is resulted from
$\sigma-$model using; due to specific symmetries of this minimal extension,
there arise stable hypermesons and hyperbaryons which are interpreted as the
Dark Matter candidates. Knowing estimations of their masses from analysis of
Dark Matter annihilation kinetics, some processes of high energy cosmic rays
scattering off these particles are analyzed for the search of Dark Matter
manifestations.
|
[
{
"created": "Thu, 19 Nov 2020 06:25:53 GMT",
"version": "v1"
}
] |
2020-11-20
|
[
[
"Beylin",
"Vitaly",
""
],
[
"Kuksa",
"Vladimir",
""
]
] |
We present and discuss some basic elements of the Standard Model hypercolor extension. Appearance of a set of hyperquarks bound states is resulted from $\sigma-$model using; due to specific symmetries of this minimal extension, there arise stable hypermesons and hyperbaryons which are interpreted as the Dark Matter candidates. Knowing estimations of their masses from analysis of Dark Matter annihilation kinetics, some processes of high energy cosmic rays scattering off these particles are analyzed for the search of Dark Matter manifestations.
|
hep-ph/9802330
|
Kang sin kyu
|
Kyungsik Kang and Sin Kyu Kang
|
New Class of Quark Mass Matrices and the Flavor Mixing Matrix
|
Latex, 8 pages, talk given at the APCTP Workshop, Pacific Particle
Physics Phenomenology, Seoul, Korea, 31 October - 2 November, 1997
| null | null | null |
hep-ph
| null |
We discuss a new general class of mass matrix ansatz that respects the
fermion mass hierarchy and calculability of the flavor mixing matrix. This is a
generalization of the various specific forms of the mass matrix that is
obtained by successive breaking of the maximal permutation symmetry. By
confronting the experimental data, a large class of the mass matrices are shown
to survive, while certain specific cases are phenomenologically ruled out.
|
[
{
"created": "Mon, 16 Feb 1998 08:39:41 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kang",
"Kyungsik",
""
],
[
"Kang",
"Sin Kyu",
""
]
] |
We discuss a new general class of mass matrix ansatz that respects the fermion mass hierarchy and calculability of the flavor mixing matrix. This is a generalization of the various specific forms of the mass matrix that is obtained by successive breaking of the maximal permutation symmetry. By confronting the experimental data, a large class of the mass matrices are shown to survive, while certain specific cases are phenomenologically ruled out.
|
2011.01915
|
Manuel Pavon Valderrama
|
Fang-Zheng Peng, Mao-Jun Yan, Mario S\'anchez S\'anchez, Manuel Pavon
Valderrama
|
The $P_{cs}(4459)$ pentaquark from a combined effective field theory and
phenomenological perspective
|
16 pages, 1 figure; includes discussions on power counting, the
J=1/2,3/2 hyperfine splitting, saturation, phenomenological relation between
the Pcs(4459) and Pc(4440/4457) potentials, decay to $J/\psi \Lambda$, etc
|
Eur. Phys. J. C 81, 666 (2021)
|
10.1140/epjc/s10052-021-09416-x
| null |
hep-ph hep-ex hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The observation of the $P_{cs}(4459)$ by the LHCb collaboration adds a new
member to the set of known hidden-charm pentaquarks, which includes the
$P_c(4312)$, $P_c(4440)$ and $P_c(4457)$. The $P_{cs}(4459)$ is expected to
have the light-quark content of a $\Lambda$ baryon ($I=0$, $S=-1$), but its
spin is unknown. Its closeness to the $\bar{D}^* \Xi_c$ threshold --
$4478\,{\rm MeV}$ in the isospin-symmetric limit -- suggests the molecular
hypothesis as a plausible explanation for the $P_{cs}(4459)$. While in the
absence of coupled-channel dynamics heavy-quark spin symmetry predicts the two
spin-states of the $\bar{D}^* \Xi_c$ to be degenerate, power counting arguments
indicate that the coupling with the nearby $\bar{D} \Xi_c'$ and $\bar{D}
\Xi_c^*$ channels might be a leading order effect. This generates a hyperfine
splitting in which the $J=\tfrac{3}{2}$ $\bar{D}^* \Xi_c$ pentaquark will be
lighter than the $J=\tfrac{1}{2}$ configuration, which we estimate to be of the
order of $5-15\,{\rm MeV}$. We also point out an accidental symmetry between
the $P_{cs}(4459)$ and $P_c(4440/4457)$ potentials. Finally, we argue that the
spectroscopy and the $J/\psi \Lambda$ decays of the $P_{cs}(4459)$ might
suggest a marginal preference for $J = \tfrac{3}{2}$ over $J = \tfrac{1}{2}$.
|
[
{
"created": "Tue, 3 Nov 2020 18:43:29 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Nov 2020 18:55:44 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Jan 2021 18:30:28 GMT",
"version": "v3"
},
{
"created": "Sun, 28 Feb 2021 13:36:20 GMT",
"version": "v4"
},
{
"created": "Wed, 4 Aug 2021 07:47:02 GMT",
"version": "v5"
}
] |
2021-08-05
|
[
[
"Peng",
"Fang-Zheng",
""
],
[
"Yan",
"Mao-Jun",
""
],
[
"Sánchez",
"Mario Sánchez",
""
],
[
"Valderrama",
"Manuel Pavon",
""
]
] |
The observation of the $P_{cs}(4459)$ by the LHCb collaboration adds a new member to the set of known hidden-charm pentaquarks, which includes the $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$. The $P_{cs}(4459)$ is expected to have the light-quark content of a $\Lambda$ baryon ($I=0$, $S=-1$), but its spin is unknown. Its closeness to the $\bar{D}^* \Xi_c$ threshold -- $4478\,{\rm MeV}$ in the isospin-symmetric limit -- suggests the molecular hypothesis as a plausible explanation for the $P_{cs}(4459)$. While in the absence of coupled-channel dynamics heavy-quark spin symmetry predicts the two spin-states of the $\bar{D}^* \Xi_c$ to be degenerate, power counting arguments indicate that the coupling with the nearby $\bar{D} \Xi_c'$ and $\bar{D} \Xi_c^*$ channels might be a leading order effect. This generates a hyperfine splitting in which the $J=\tfrac{3}{2}$ $\bar{D}^* \Xi_c$ pentaquark will be lighter than the $J=\tfrac{1}{2}$ configuration, which we estimate to be of the order of $5-15\,{\rm MeV}$. We also point out an accidental symmetry between the $P_{cs}(4459)$ and $P_c(4440/4457)$ potentials. Finally, we argue that the spectroscopy and the $J/\psi \Lambda$ decays of the $P_{cs}(4459)$ might suggest a marginal preference for $J = \tfrac{3}{2}$ over $J = \tfrac{1}{2}$.
|
hep-ph/0212005
|
Marieke Postma
|
Marieke Postma (ICTP, Trieste)
|
The curvaton scenario in supersymmetric theories
|
8 pages, 4 figures
|
Phys.Rev.D67:063518,2003
|
10.1103/PhysRevD.67.063518
| null |
hep-ph astro-ph
| null |
We analyze the curvaton scenario in the context of supersymmety.
Supersymmetric theories contain many scalars, and therefore many curvaton
candidates. To obtain a scale invariant perturbation spectrum, the curvaton
mass should be small during inflation $m \ll H$. This can be achieved by
invoking symmetries, which suppress the soft masses and non-renormalizable
terms in the potential. Other constraints on the curvaton model come from
nucleosynthesis, gravitino overproduction, and thermal evaporation. The
curvaton coupling to matter should be very small to satisfy these constraints
({\it e.g.} $h \lesssim 10^{-8}$ for typical soft masses $m \sim \TeV$).
|
[
{
"created": "Mon, 2 Dec 2002 10:04:27 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jan 2003 11:31:32 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Postma",
"Marieke",
"",
"ICTP, Trieste"
]
] |
We analyze the curvaton scenario in the context of supersymmety. Supersymmetric theories contain many scalars, and therefore many curvaton candidates. To obtain a scale invariant perturbation spectrum, the curvaton mass should be small during inflation $m \ll H$. This can be achieved by invoking symmetries, which suppress the soft masses and non-renormalizable terms in the potential. Other constraints on the curvaton model come from nucleosynthesis, gravitino overproduction, and thermal evaporation. The curvaton coupling to matter should be very small to satisfy these constraints ({\it e.g.} $h \lesssim 10^{-8}$ for typical soft masses $m \sim \TeV$).
|
2211.11007
|
Paul Caucal
|
Paul Caucal
|
Anomalous dimension of transverse momentum broadening in planar
$\mathcal{N}=4$ SYM
|
8 pages, 1 figure, contribution to the proceedings of the "XVth
International Conference on Quark Confinement and the Hadron Spectrum"
| null |
10.1051/epjconf/202227405018
| null |
hep-ph hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The typical transverse momentum $Q_s(t)$ (or "saturation" momentum) acquired
by a hard particle propagating through a $\mathcal{N}=4$ SYM plasma increases
over time like $t^\gamma$, with an anomalous exponent $\gamma>1/2$
characteristic of super-diffusion. This anomalous exponent is a function of the
't Hooft coupling $\lambda=g^2N_c$. Recently, a method has been proposed to
systematically compute the perturbative series of $\gamma(\lambda)$ at weak
coupling. This method relies on the traveling wave interpretation of the time
evolution of $Q_s(t)$ and on the dominance of soft-collinear radiative
corrections at large times. In this paper, we compute $\gamma(\lambda)$ up to
$\mathcal{O}(\lambda^{2})$ using the double logarithmic behaviour of the BFKL
equation in planar $\mathcal{N}=4$ SYM at three loops. This calculation allows
us to discuss the transition towards the strong coupling regime where AdS/CFT
calculations predict $\gamma\to 1$.
|
[
{
"created": "Sun, 20 Nov 2022 15:51:57 GMT",
"version": "v1"
}
] |
2023-01-11
|
[
[
"Caucal",
"Paul",
""
]
] |
The typical transverse momentum $Q_s(t)$ (or "saturation" momentum) acquired by a hard particle propagating through a $\mathcal{N}=4$ SYM plasma increases over time like $t^\gamma$, with an anomalous exponent $\gamma>1/2$ characteristic of super-diffusion. This anomalous exponent is a function of the 't Hooft coupling $\lambda=g^2N_c$. Recently, a method has been proposed to systematically compute the perturbative series of $\gamma(\lambda)$ at weak coupling. This method relies on the traveling wave interpretation of the time evolution of $Q_s(t)$ and on the dominance of soft-collinear radiative corrections at large times. In this paper, we compute $\gamma(\lambda)$ up to $\mathcal{O}(\lambda^{2})$ using the double logarithmic behaviour of the BFKL equation in planar $\mathcal{N}=4$ SYM at three loops. This calculation allows us to discuss the transition towards the strong coupling regime where AdS/CFT calculations predict $\gamma\to 1$.
|
2109.11754
|
Xu-Dong Huang
|
Chu-Tian Gao, Xing-Gang Wu, Xu-Dong Huang and Jun Zeng
|
Total decay width of $H \to gg$ using the infinite-order scale-setting
approach based on the intrinsic conformality
|
7 pages, 3 figures, to be published in Chinese Physics C
|
Chin. Phys. C 46, 123109 (2022)
|
10.1088/1674-1137/ac92da
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We make a detailed study on the properties of the total decay width of Higgs
decay channel $H\to gg$ up to $\alpha_s^6$-order QCD corrections by using the
newly suggested infinite-order scale-setting approach, which is based on the
ideas of both the principle of maximum conformality and the intrinsic
conformality. This approach is called as the PMC$_\infty$ approach. By using
the PMC$_\infty$ approach, we observe that the conventional renormalization
scale ambiguity in perturbative QCD calculation is eliminated and the residual
scale dependence due to unknown higher-order terms can also be highly
suppressed. We then obtain an accurate perturbative QCD prediction on the total
decay width, e.g. $\Gamma (H \to gg)|_{\rm PMC_\infty} =336.42^{+7.01}_{-6.92}$
KeV, where the errors are squared averages of those from all the mentioned
error sources.
|
[
{
"created": "Fri, 24 Sep 2021 05:51:27 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Sep 2022 06:27:00 GMT",
"version": "v2"
}
] |
2022-10-20
|
[
[
"Gao",
"Chu-Tian",
""
],
[
"Wu",
"Xing-Gang",
""
],
[
"Huang",
"Xu-Dong",
""
],
[
"Zeng",
"Jun",
""
]
] |
We make a detailed study on the properties of the total decay width of Higgs decay channel $H\to gg$ up to $\alpha_s^6$-order QCD corrections by using the newly suggested infinite-order scale-setting approach, which is based on the ideas of both the principle of maximum conformality and the intrinsic conformality. This approach is called as the PMC$_\infty$ approach. By using the PMC$_\infty$ approach, we observe that the conventional renormalization scale ambiguity in perturbative QCD calculation is eliminated and the residual scale dependence due to unknown higher-order terms can also be highly suppressed. We then obtain an accurate perturbative QCD prediction on the total decay width, e.g. $\Gamma (H \to gg)|_{\rm PMC_\infty} =336.42^{+7.01}_{-6.92}$ KeV, where the errors are squared averages of those from all the mentioned error sources.
|
2002.05340
|
Rong Wang
|
Yu Xu, Yaping Xie, Rong Wang, Xurong Chen
|
Estimation of $\Upsilon$(1S) production in ep process near threshold
|
5 pages, 4 figures
|
Eur. Phys. J. C 80, 283 (2020)
|
10.1140/epjc/s10052-020-7845-6
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The near-threshold photo-productions of heavy quarkonia are important ways to
test the QCD-inspired models and to constrain the gluon distribution of nucleon
in the large x region. Investigating the various models, we choose a
photon-gluon fusion model and a pomeron exchange model for J/$\Psi$
photo-production near threshold, emphasising on the explanation of the recent
experimental measurement by GlueX at JLab. We find that these two models are
not only valid in a wide range of the center-of-mass energy of $\gamma$ and
proton, but also can be generalized to describe the $\Upsilon$(1S)
photo-production. Using these two models, we predict the electro-production
cross-sections of $\Upsilon$(1S) at EicC to be 48 fb to 85 fb at the
center-of-mass energy of 16.75 GeV.
|
[
{
"created": "Thu, 13 Feb 2020 04:34:44 GMT",
"version": "v1"
}
] |
2020-04-02
|
[
[
"Xu",
"Yu",
""
],
[
"Xie",
"Yaping",
""
],
[
"Wang",
"Rong",
""
],
[
"Chen",
"Xurong",
""
]
] |
The near-threshold photo-productions of heavy quarkonia are important ways to test the QCD-inspired models and to constrain the gluon distribution of nucleon in the large x region. Investigating the various models, we choose a photon-gluon fusion model and a pomeron exchange model for J/$\Psi$ photo-production near threshold, emphasising on the explanation of the recent experimental measurement by GlueX at JLab. We find that these two models are not only valid in a wide range of the center-of-mass energy of $\gamma$ and proton, but also can be generalized to describe the $\Upsilon$(1S) photo-production. Using these two models, we predict the electro-production cross-sections of $\Upsilon$(1S) at EicC to be 48 fb to 85 fb at the center-of-mass energy of 16.75 GeV.
|
0907.1852
|
Elizabeth Jenkins
|
Elizabeth E. Jenkins
|
Large N_c
|
4 pages, Invited talk at CIPANP 2009, May 26-31, 2009, to be
published in the proceedings
|
AIP Conf.Proc.1182:467-470,2009
|
10.1063/1.3293846
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The 1/N_c expansion of QCD with N_c=3 has been successful in explaining a
wide variety of QCD phenomenology. Here I focus on the contracted spin-flavor
symmetry of baryons in the large-N_c limit and deviations from spin-flavor
symmetry due to corrections suppressed by powers of 1/N_c. Baryon masses
provide an important example of the 1/N_c expansion, and successful predictions
of masses of heavy-quark baryons continue to be tested by experiment. The
ground state charmed baryon masses have all been measured, and five of the
eight ground state bottom baryon masses have been found. Results of the 1/N_c
expansion can aid in the discovery of the remaining bottom baryons. The brand
new measurement of the \Omega_b^- mass by the CDF collaboration conflicts with
the original D0 discovery value and is in excellent agreement with the
prediction of the 1/N_c expansion.
|
[
{
"created": "Fri, 10 Jul 2009 15:49:44 GMT",
"version": "v1"
}
] |
2010-05-27
|
[
[
"Jenkins",
"Elizabeth E.",
""
]
] |
The 1/N_c expansion of QCD with N_c=3 has been successful in explaining a wide variety of QCD phenomenology. Here I focus on the contracted spin-flavor symmetry of baryons in the large-N_c limit and deviations from spin-flavor symmetry due to corrections suppressed by powers of 1/N_c. Baryon masses provide an important example of the 1/N_c expansion, and successful predictions of masses of heavy-quark baryons continue to be tested by experiment. The ground state charmed baryon masses have all been measured, and five of the eight ground state bottom baryon masses have been found. Results of the 1/N_c expansion can aid in the discovery of the remaining bottom baryons. The brand new measurement of the \Omega_b^- mass by the CDF collaboration conflicts with the original D0 discovery value and is in excellent agreement with the prediction of the 1/N_c expansion.
|
2007.05538
|
Jared Barron
|
Jared Barron, David Curtin
|
On the Origin of Long-Lived Particles
|
35 pages, 14 figures plus references. v2: updated grant information
| null |
10.1007/JHEP12(2020)061
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
MATHUSLA is a proposed large-volume displaced vertex (DV) detector, situated
on the surface above CMS and designed to search for long-lived particles (LLPs)
produced at the HL-LHC. We show that a discovery of LLPs at MATHUSLA would not
only prove the existence of BSM physics, it would also uncover the theoretical
origin of the LLPs, despite the fact that MATHUSLA gathers no energy or
momentum information on the LLP decay products. Our analysis is simple and
robust, making it easily generalizable to include more complex LLP scenarios,
and our methods are applicable to LLP decays discovered in ATLAS, CMS, LHCb, or
other external detectors. In the event of an LLP detection, MATHUSLA can act as
a Level-1 trigger for the main detector, guaranteeing that the LLP production
event is read out at CMS. We perform an LLP simplified model analysis to show
that combining information from the MATHUSLA and CMS detectors would allow the
LLP production mode topology to be determined with as few as $\sim 100$
observed LLP decays. Underlying theory parameters, like the LLP and parent
particle masses, can also be measured with $\lesssim 10\%$ precision. Together
with information on the LLP decay mode from the geometric properties of the
observed DV, it is clear that MATHUSLA and CMS together will be able to
characterize any newly discovered physics in great detail.
|
[
{
"created": "Fri, 10 Jul 2020 18:00:02 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Nov 2021 18:27:14 GMT",
"version": "v2"
}
] |
2021-11-03
|
[
[
"Barron",
"Jared",
""
],
[
"Curtin",
"David",
""
]
] |
MATHUSLA is a proposed large-volume displaced vertex (DV) detector, situated on the surface above CMS and designed to search for long-lived particles (LLPs) produced at the HL-LHC. We show that a discovery of LLPs at MATHUSLA would not only prove the existence of BSM physics, it would also uncover the theoretical origin of the LLPs, despite the fact that MATHUSLA gathers no energy or momentum information on the LLP decay products. Our analysis is simple and robust, making it easily generalizable to include more complex LLP scenarios, and our methods are applicable to LLP decays discovered in ATLAS, CMS, LHCb, or other external detectors. In the event of an LLP detection, MATHUSLA can act as a Level-1 trigger for the main detector, guaranteeing that the LLP production event is read out at CMS. We perform an LLP simplified model analysis to show that combining information from the MATHUSLA and CMS detectors would allow the LLP production mode topology to be determined with as few as $\sim 100$ observed LLP decays. Underlying theory parameters, like the LLP and parent particle masses, can also be measured with $\lesssim 10\%$ precision. Together with information on the LLP decay mode from the geometric properties of the observed DV, it is clear that MATHUSLA and CMS together will be able to characterize any newly discovered physics in great detail.
|
hep-ph/0008166
|
Liao Wei
|
Chao-Shang Huang, Liao Wei, Qi-Shu Yan, Shou-Hua Zhu
|
Renormalizaion group equations and infrared quasi fixed point behaviors
of non-universal soft terms in MSSM
|
latex, 13 pages, 2 figures, references added
|
J.Phys.G27:833-844,2001
|
10.1088/0954-3899/27/4/308
| null |
hep-ph
| null |
The renormalization group equations(RGEs) of non-universal soft
supersymmetric breaking terms with CP violating phases are analyzed in this
paper. We obtain the analytic solutions of RGEs by directly solving the RGEs
themselves. Compared with the method of spurion expansion our approach proves
to be simple and succinct, and easy to extend to the case of complex
parameters. With the analytical forms of the solutions we obtained the infrared
quasi fixed point behavior of soft terms are analyzed and it turns out to
support the notion in scenarios with CP violating phases.
|
[
{
"created": "Wed, 16 Aug 2000 12:10:30 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jan 2001 09:56:50 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Huang",
"Chao-Shang",
""
],
[
"Wei",
"Liao",
""
],
[
"Yan",
"Qi-Shu",
""
],
[
"Zhu",
"Shou-Hua",
""
]
] |
The renormalization group equations(RGEs) of non-universal soft supersymmetric breaking terms with CP violating phases are analyzed in this paper. We obtain the analytic solutions of RGEs by directly solving the RGEs themselves. Compared with the method of spurion expansion our approach proves to be simple and succinct, and easy to extend to the case of complex parameters. With the analytical forms of the solutions we obtained the infrared quasi fixed point behavior of soft terms are analyzed and it turns out to support the notion in scenarios with CP violating phases.
|
hep-ph/9409249
|
Stefano Forte
|
Stefano Forte and Richard D. Ball (CERN, Geneva)
|
Anomalous Evolution of Nonsinglet Structure Functions
|
7 pages, 5 figures included as three compressed .ps files, plain
LATEX, CERN-TH.7436/94 technical glitch fixed
|
Nucl.Phys.Proc.Suppl. 39BC (1995) 28-31
|
10.1016/0920-5632(95)00037-A
| null |
hep-ph
| null |
We review a formalism that includes the effects of nonperturbative U(1)
symmetry breaking on the QCD evolution of nonsinglet structure functions. We
show that a strong scale dependence is generated in an intermediate energy
range $0.5 \lsim Q^2 \lsim 5$~GeV$^2$ for all values of $x$. We show that this
explains naturally the observed violation of the Gottfried sum, and allows a
determination of the shape of the nonsinglet structure function, in excellent
agreement with experiment. We argue that these effects may affect the
determination of $\alpha_s$ from deep--inelastic scattering.
|
[
{
"created": "Wed, 7 Sep 1994 16:09:14 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Sep 1994 14:09:46 GMT",
"version": "v2"
},
{
"created": "Fri, 30 Sep 1994 18:54:04 GMT",
"version": "v3"
}
] |
2009-10-28
|
[
[
"Forte",
"Stefano",
"",
"CERN, Geneva"
],
[
"Ball",
"Richard D.",
"",
"CERN, Geneva"
]
] |
We review a formalism that includes the effects of nonperturbative U(1) symmetry breaking on the QCD evolution of nonsinglet structure functions. We show that a strong scale dependence is generated in an intermediate energy range $0.5 \lsim Q^2 \lsim 5$~GeV$^2$ for all values of $x$. We show that this explains naturally the observed violation of the Gottfried sum, and allows a determination of the shape of the nonsinglet structure function, in excellent agreement with experiment. We argue that these effects may affect the determination of $\alpha_s$ from deep--inelastic scattering.
|
1807.03309
|
Andrea Caputo
|
Andrea Caputo, Pilar Hernandez, Nuria Rius
|
Leptogenesis from oscillations and dark matter
|
A relevant previously neglected process has been included,
conclusions mostly unchanged. Matches published version
| null |
10.1140/epjc/s10052-019-7083-y
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An extension of the Standard Model with Majorana singlet fermions in the
1-100 GeV range can give rise to a baryon asymmetry at freeze-in via the
CP-violating oscillations of these neutrinos: this is the well known ARS
mechanism. In this paper we consider possible extensions of the minimal ARS
scenario that can account not only for successful leptogenesis but also explain
other open problems such as dark matter. We find that an extension in the form
of a weakly coupled B-L gauge boson, an invisible QCD axion model, and the
singlet majoron model can simultaneously account for dark matter and the baryon
asymmetry.
|
[
{
"created": "Mon, 9 Jul 2018 18:00:02 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jul 2018 13:07:42 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Aug 2019 08:04:44 GMT",
"version": "v3"
}
] |
2019-08-21
|
[
[
"Caputo",
"Andrea",
""
],
[
"Hernandez",
"Pilar",
""
],
[
"Rius",
"Nuria",
""
]
] |
An extension of the Standard Model with Majorana singlet fermions in the 1-100 GeV range can give rise to a baryon asymmetry at freeze-in via the CP-violating oscillations of these neutrinos: this is the well known ARS mechanism. In this paper we consider possible extensions of the minimal ARS scenario that can account not only for successful leptogenesis but also explain other open problems such as dark matter. We find that an extension in the form of a weakly coupled B-L gauge boson, an invisible QCD axion model, and the singlet majoron model can simultaneously account for dark matter and the baryon asymmetry.
|
1811.10377
|
Seong Youl Choi
|
Seong Youl Choi
|
$Z$-boson polarization as a model-discrimination analyzer
|
10 pages, 3 figures, 1 table
|
Phys. Rev. D 98, 115037 (2018)
|
10.1103/PhysRevD.98.115037
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Determining the spin of any new particle is critical in identifying the true
theory among various extensions of the Standard Model (SM). The degree of
$Z$-boson polarization in any two-body decay process $A\to B Z$ is sensitive to
the spin assignments of two new particles $A$ and $B$. Considering all possible
spin-0, 1/2 and 1 combinations in a renormalizable field theory, we demonstrate
that $Z$-boson polarization can indeed play a role of a decisive and universal
analyzer in distinguishing the different spin assignments.
|
[
{
"created": "Mon, 26 Nov 2018 14:11:14 GMT",
"version": "v1"
}
] |
2019-01-02
|
[
[
"Choi",
"Seong Youl",
""
]
] |
Determining the spin of any new particle is critical in identifying the true theory among various extensions of the Standard Model (SM). The degree of $Z$-boson polarization in any two-body decay process $A\to B Z$ is sensitive to the spin assignments of two new particles $A$ and $B$. Considering all possible spin-0, 1/2 and 1 combinations in a renormalizable field theory, we demonstrate that $Z$-boson polarization can indeed play a role of a decisive and universal analyzer in distinguishing the different spin assignments.
|
hep-ph/9711291
|
Schildknecht
|
D. Schildknecht
|
Low x Inelastic Electron Scattering From Generalized Vector Dominance
|
8 pages, 2 figures, other comments
|
Acta Phys.Polon.B28:2453-2460,1997
| null |
BI-TP 97/48
|
hep-ph
| null |
It is shown that the HERA experimental data on deep inelastic scattering at
low values of the scaling variable x < 0.05 are in good agreement with
predictions from Generalized Vector Dominance in the full kinematic range from
Q2 = 0 (photoproduction) to Q2 = 350 GeV.
|
[
{
"created": "Tue, 11 Nov 1997 17:39:36 GMT",
"version": "v1"
}
] |
2011-04-15
|
[
[
"Schildknecht",
"D.",
""
]
] |
It is shown that the HERA experimental data on deep inelastic scattering at low values of the scaling variable x < 0.05 are in good agreement with predictions from Generalized Vector Dominance in the full kinematic range from Q2 = 0 (photoproduction) to Q2 = 350 GeV.
|
1106.3308
|
John F. Gunion
|
John F. Gunion
|
A two-Higgs-doublet interpretation of a small Tevatron $Wjj$ excess
|
4 pages, 6 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that a $Wjj$ excess in Tevatron data could be explained in the
context of the standard non-supersymmetric two-Higgs-doublet model for
appropriately chosen parameters. Correlated signals in the $\gamma\gamma$ and
$W^+ W^- b \anti b$ final states are predicted and are on the verge of being
detectable. The proposed model is most attractive if the cross section for the
$Wjj$ excess is $\lsim 1-2\pb$.
|
[
{
"created": "Thu, 16 Jun 2011 19:00:07 GMT",
"version": "v1"
}
] |
2011-06-17
|
[
[
"Gunion",
"John F.",
""
]
] |
We show that a $Wjj$ excess in Tevatron data could be explained in the context of the standard non-supersymmetric two-Higgs-doublet model for appropriately chosen parameters. Correlated signals in the $\gamma\gamma$ and $W^+ W^- b \anti b$ final states are predicted and are on the verge of being detectable. The proposed model is most attractive if the cross section for the $Wjj$ excess is $\lsim 1-2\pb$.
|
hep-ph/9801391
|
Marco Aurelio Diaz
|
Marco A. Diaz, J. Ferrandis, Jorge C. Romao, and Jose W.F. Valle
|
Gauge and Yukawa Unification with Broken R-Parity
|
9 pages, including one figure. Latex
|
Phys.Lett.B453:263-268,1999
|
10.1016/S0370-2693(99)00387-1
|
FTUV/98-9, IFIC/98-9, FISIST/1-98/CFIF
|
hep-ph hep-th
| null |
We study gauge and Yukawa coupling unification in the simplest extension of
the Minimal Supersymmetric Standard Model (MSSM) which incorporates R-Parity
violation through a bilinear superpotential term. Contrary to what happens in
the MSSM, we show that bottom-tau unification at the scale M_GUT where the
gauge couplings unify can be achieved for any value of tan(beta) by choosing
appropriately the sneutrino vacuum expectation value. In addition, we show that
bottom-tau-top unification occurs in a slightly wider tan(beta) range than in
the MSSM.
|
[
{
"created": "Thu, 22 Jan 1998 11:02:23 GMT",
"version": "v1"
}
] |
2009-09-17
|
[
[
"Diaz",
"Marco A.",
""
],
[
"Ferrandis",
"J.",
""
],
[
"Romao",
"Jorge C.",
""
],
[
"Valle",
"Jose W. F.",
""
]
] |
We study gauge and Yukawa coupling unification in the simplest extension of the Minimal Supersymmetric Standard Model (MSSM) which incorporates R-Parity violation through a bilinear superpotential term. Contrary to what happens in the MSSM, we show that bottom-tau unification at the scale M_GUT where the gauge couplings unify can be achieved for any value of tan(beta) by choosing appropriately the sneutrino vacuum expectation value. In addition, we show that bottom-tau-top unification occurs in a slightly wider tan(beta) range than in the MSSM.
|
2110.12295
|
Miguel \'Angel Escobedo Espinosa
|
Miguel \'Angel Escobedo and Elena G. Ferreiro
|
A simple model to include initial-state and hot-medium effects in the
computation of quarkonium nuclear modification factor
|
22 pages, 4 figure. Updated to match published version
|
Phys.Rev.D 105 (2022) 1, 014019
|
10.1103/PhysRevD.105.014019
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Quarkonium suppression is one of the more useful observables to obtain
information about the hot medium created in ultrarelativistic heavy-ion
collisions. In this manuscript, we discuss a simple way to implement both the
initial-state effects and the hot-medium evolution, and to compute the
quarkonium nuclear modification factor if the survival probability for a bound
state at a given energy density is known. Based on the Glauber model, the
temperature of the evolving medium and the centrality dependence of the nuclear
modification factor will be analysed.
|
[
{
"created": "Sat, 23 Oct 2021 20:31:24 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Feb 2022 16:12:22 GMT",
"version": "v2"
}
] |
2022-02-04
|
[
[
"Escobedo",
"Miguel Ángel",
""
],
[
"Ferreiro",
"Elena G.",
""
]
] |
Quarkonium suppression is one of the more useful observables to obtain information about the hot medium created in ultrarelativistic heavy-ion collisions. In this manuscript, we discuss a simple way to implement both the initial-state effects and the hot-medium evolution, and to compute the quarkonium nuclear modification factor if the survival probability for a bound state at a given energy density is known. Based on the Glauber model, the temperature of the evolving medium and the centrality dependence of the nuclear modification factor will be analysed.
|
1107.4671
|
Domenico Falcone
|
M. Abud, F. Buccella, D. Falcone, L. Oliver
|
Seesaw model in SO(10) with an upper limit on right-handed neutrino
masses
|
14 pages. Revised version with 3 figures
| null |
10.1103/PhysRevD.86.033006
|
DSF/8/2011
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the framework of SO(10) gauge unification and the seesaw mechanism, we
show that the upper bound on the mass of the heaviest right-handed neutrino
$M_{R_3} < 3 \times 10^{11}$ GeV, given by the Pati-Salam intermediate scale of
$B-L$ spontaneous symmetry breaking, constrains the observables related to the
left-handed light neutrino mass matrix. We assume such an upper limit on the
masses of right-handed neutrinos and, as a first approximation, a Cabibbo form
for the matrix $V^L$ that diagonalizes the Dirac neutrino matrix $m_D$. Using
the inverse seesaw formula, we show that our hypotheses imply a triangular
relation in the complex plane of the light neutrino masses with the Majorana
phases. We obtain normal hierarchy with an absolute scale for the light
neutrino spectrum. Two regions are allowed for the lightest neutrino mass $m_1$
and for the Majorana phases, implying predictions for the neutrino mass
measured in Tritium decay and for the double beta decay effective mass
$|<m_{ee}>|$.
|
[
{
"created": "Sat, 23 Jul 2011 09:22:02 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jan 2012 15:55:10 GMT",
"version": "v2"
}
] |
2015-05-28
|
[
[
"Abud",
"M.",
""
],
[
"Buccella",
"F.",
""
],
[
"Falcone",
"D.",
""
],
[
"Oliver",
"L.",
""
]
] |
In the framework of SO(10) gauge unification and the seesaw mechanism, we show that the upper bound on the mass of the heaviest right-handed neutrino $M_{R_3} < 3 \times 10^{11}$ GeV, given by the Pati-Salam intermediate scale of $B-L$ spontaneous symmetry breaking, constrains the observables related to the left-handed light neutrino mass matrix. We assume such an upper limit on the masses of right-handed neutrinos and, as a first approximation, a Cabibbo form for the matrix $V^L$ that diagonalizes the Dirac neutrino matrix $m_D$. Using the inverse seesaw formula, we show that our hypotheses imply a triangular relation in the complex plane of the light neutrino masses with the Majorana phases. We obtain normal hierarchy with an absolute scale for the light neutrino spectrum. Two regions are allowed for the lightest neutrino mass $m_1$ and for the Majorana phases, implying predictions for the neutrino mass measured in Tritium decay and for the double beta decay effective mass $|<m_{ee}>|$.
|
1211.4708
|
Guennadi Volkov Germanovich
|
D.S. Baranov and G.G. Volkov
|
Neutrino and Extra World
|
26 pages, 5 figures. Based on talk given by G.G.V. at the Workshop
SHQCD12, Gatchina, St. Petersburg, Russia, 4-8 July 2012
| null | null | null |
hep-ph gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The neutrino speed measurement experiments are the continuations of the
classic light speed measurement experiments have been done in range of the
solar planet system (Ole Roemer, 1676), in star system (James Braidely, 1728)
and, at last, on the Earth (Lois Fizeau, 1849),.... The finite light speed
measurement has led to the revolution in the humanity consciousness and
eventually led to a new understanding of the visible universe. In 1998-2005, we
had a lot of excited discussions at CERN about the possibilities to perform the
neutrino experiments to test the superluminal neutrino hypothesis and to find
new phenomena beyond the SM. From one hand the idea of such experiments was
associated with the hope to understand the role of the V-A- weak interactions,
the quark-lepton family symmetry, the neutrino space-time properties and to
observe some indications on a new vacuum structure existence outside of the
Weak Scale, i.e. in the region 1/R ~ (0.1-20) TeV. From another hand the
general trends of this idea has been related to the possible existence some
extra space-time noncompact dimensions of the universe. In this context it
would be first serious encounter with the dual conception between the physical
phenomena of microcosmos and of universe. One of the main goals is to find some
new space-time peculiarities and structures that might explain the formation of
our visible D=(3+1)-universe with all its space-time and internal symmetries
which could be only a part of a vast Universe filled with other kinds of
matter. The main difficulties of such experiments related to the possible
relativity principle paradoxes have been discussed.
|
[
{
"created": "Tue, 20 Nov 2012 10:49:32 GMT",
"version": "v1"
}
] |
2013-02-06
|
[
[
"Baranov",
"D. S.",
""
],
[
"Volkov",
"G. G.",
""
]
] |
The neutrino speed measurement experiments are the continuations of the classic light speed measurement experiments have been done in range of the solar planet system (Ole Roemer, 1676), in star system (James Braidely, 1728) and, at last, on the Earth (Lois Fizeau, 1849),.... The finite light speed measurement has led to the revolution in the humanity consciousness and eventually led to a new understanding of the visible universe. In 1998-2005, we had a lot of excited discussions at CERN about the possibilities to perform the neutrino experiments to test the superluminal neutrino hypothesis and to find new phenomena beyond the SM. From one hand the idea of such experiments was associated with the hope to understand the role of the V-A- weak interactions, the quark-lepton family symmetry, the neutrino space-time properties and to observe some indications on a new vacuum structure existence outside of the Weak Scale, i.e. in the region 1/R ~ (0.1-20) TeV. From another hand the general trends of this idea has been related to the possible existence some extra space-time noncompact dimensions of the universe. In this context it would be first serious encounter with the dual conception between the physical phenomena of microcosmos and of universe. One of the main goals is to find some new space-time peculiarities and structures that might explain the formation of our visible D=(3+1)-universe with all its space-time and internal symmetries which could be only a part of a vast Universe filled with other kinds of matter. The main difficulties of such experiments related to the possible relativity principle paradoxes have been discussed.
|
1302.6938
|
Lorenzo Luis Salcedo
|
C. Garcia-Recio, J. Nieves, O. Romanets, L. L. Salcedo, L. Tolos
|
Hidden charm N and Delta resonances with heavy-quark symmetry
|
31 pages, 3 figures
|
Phys. Rev. D 87, 074034 (2013)
|
10.1103/PhysRevD.87.074034
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We develop a model to describe odd parity baryon resonances generated
dynamically through a unitary baryon-meson coupled-channels approach. The
scheme applies to channels with light and/or heavy quark content. Distinct
features of the model are that, i) the interaction is an S-wave contact one,
ii) it reduces to the SU(3) Weinberg-Tomozawa Hamiltonian when light
pseudoscalar mesons are involved, thus, respecting chiral symmetry, iii)
spin-flavor in preserved in the light quark sector, and iv) heavy quark spin
symmetry is fulfilled in the heavy quark sector. In particular, baryon-meson
states with different content in c or in c-bar do not mix. The model is a
minimal one and it contains no free parameters. In this work, we focus on
baryon resonances with hidden-charm (at least one c-bar and one c quarks). We
analyze several possible sectors and, for the sector with zero net charm, we
write down the most general Lagrangian consistent with SU(3) and heavy quark
spin symmetry. We explicitly study the N and Delta states, which are produced
from the S-wave interaction of pseudoscalar and vector mesons with 1/2+ and
3/2+ baryons within the charmless and strangeless hidden charm sector. We
predict seven odd parity N-like and five Delta-like states with masses around 4
GeV, most of them as bound states. These states form heavy-quark spin
multiplets, which are almost degenerate in mass. The predicted new resonances
definitely cannot be accommodated by quark models with three constituent quarks
and they might be looked for in the forthcoming PANDA experiment at the future
FAIR facility.
|
[
{
"created": "Wed, 27 Feb 2013 17:49:20 GMT",
"version": "v1"
}
] |
2013-04-30
|
[
[
"Garcia-Recio",
"C.",
""
],
[
"Nieves",
"J.",
""
],
[
"Romanets",
"O.",
""
],
[
"Salcedo",
"L. L.",
""
],
[
"Tolos",
"L.",
""
]
] |
We develop a model to describe odd parity baryon resonances generated dynamically through a unitary baryon-meson coupled-channels approach. The scheme applies to channels with light and/or heavy quark content. Distinct features of the model are that, i) the interaction is an S-wave contact one, ii) it reduces to the SU(3) Weinberg-Tomozawa Hamiltonian when light pseudoscalar mesons are involved, thus, respecting chiral symmetry, iii) spin-flavor in preserved in the light quark sector, and iv) heavy quark spin symmetry is fulfilled in the heavy quark sector. In particular, baryon-meson states with different content in c or in c-bar do not mix. The model is a minimal one and it contains no free parameters. In this work, we focus on baryon resonances with hidden-charm (at least one c-bar and one c quarks). We analyze several possible sectors and, for the sector with zero net charm, we write down the most general Lagrangian consistent with SU(3) and heavy quark spin symmetry. We explicitly study the N and Delta states, which are produced from the S-wave interaction of pseudoscalar and vector mesons with 1/2+ and 3/2+ baryons within the charmless and strangeless hidden charm sector. We predict seven odd parity N-like and five Delta-like states with masses around 4 GeV, most of them as bound states. These states form heavy-quark spin multiplets, which are almost degenerate in mass. The predicted new resonances definitely cannot be accommodated by quark models with three constituent quarks and they might be looked for in the forthcoming PANDA experiment at the future FAIR facility.
|
1207.4875
|
Enrique Ruiz Arriola
|
E. Ruiz Arriola, E. Megias, L. L. Salcedo
|
From Chiral quark dynamics with Polyakov loop to the hadron resonance
gas model
|
6 pages, Talk given by E. R. A. at XII HADRON PHYSICS, April 22-27
2012, Bento Goncalves, Wineyards Valley Region, Rio Grande do Sul, Brazil
| null | null |
UAB-FT-711
|
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Chiral quark models with Polyakov loop at finite temperature have been often
used to describe the phase transition. We show how the transition to a hadron
resonance gas is realized based on the quantum and local nature of the Polyakov
loop.
|
[
{
"created": "Fri, 20 Jul 2012 08:31:48 GMT",
"version": "v1"
}
] |
2012-07-23
|
[
[
"Arriola",
"E. Ruiz",
""
],
[
"Megias",
"E.",
""
],
[
"Salcedo",
"L. L.",
""
]
] |
Chiral quark models with Polyakov loop at finite temperature have been often used to describe the phase transition. We show how the transition to a hadron resonance gas is realized based on the quantum and local nature of the Polyakov loop.
|
0909.5612
|
Robi Peschanski
|
Robi Peschanski (IPhT, Saclay)
|
Traveling wave solution of the Reggeon Field Theory (EPS proceedings)
|
4pages, 1 figure, Proceedings of the EPS 2009 conference, Cracow,
July 2009
|
PoS EPS-HEP2009:338,2009
| null | null |
hep-ph cond-mat.stat-mech hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We identify the nonlinear evolution equation in impact-parameter space for
the "Supercritical Pomeron" in Reggeon Field Theory as a 2-dimensional
stochastic Fisher and Kolmogorov-Petrovski-Piscounov equation. It exactly
preserves unitarity and leads in its radial form to an high energy traveling
wave solution corresponding to an "universal" behavior of the impact-parameter
front profile of the elastic amplitude; Its rapidity dependence and form depend
only on one parameter, the noise strength, independently of the initial
conditions and of the non-linear terms restoring unitarity. Theoretical
predictions are presented for the three typical different regimes corresponding
to zero, weak and strong noise, respectively. They have phenomenological
implications for total and differential hadronic cross-sections at colliders.
|
[
{
"created": "Wed, 30 Sep 2009 13:59:24 GMT",
"version": "v1"
}
] |
2014-11-20
|
[
[
"Peschanski",
"Robi",
"",
"IPhT, Saclay"
]
] |
We identify the nonlinear evolution equation in impact-parameter space for the "Supercritical Pomeron" in Reggeon Field Theory as a 2-dimensional stochastic Fisher and Kolmogorov-Petrovski-Piscounov equation. It exactly preserves unitarity and leads in its radial form to an high energy traveling wave solution corresponding to an "universal" behavior of the impact-parameter front profile of the elastic amplitude; Its rapidity dependence and form depend only on one parameter, the noise strength, independently of the initial conditions and of the non-linear terms restoring unitarity. Theoretical predictions are presented for the three typical different regimes corresponding to zero, weak and strong noise, respectively. They have phenomenological implications for total and differential hadronic cross-sections at colliders.
|
1010.3792
|
Ghil-Seok Yang
|
Ghil-Seok Yang and Hyun-Chul Kim
|
Mass splittings of SU(3) baryons within a chiral soliton model
|
13 pages. No figure. Final version accepted for publication in Prog.
Theor. Phys. arXiv admin note: substantial text overlap with arXiv:1102.1786
|
Prog. Theor. Phys. 128 (2012), 397-413
|
10.1143/PTP.128.397
|
INHA-NTG-11/2010
|
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Considering simultaneously isospin and SU(3) flavor symmetry breakings, we
investigate the complete mass splittings of SU(3) baryons within a chiral
soliton model, a {}"model-independent approach" being employed. In linear order
several new mass relations are derived, which are mostly generalizations of
existing mass formulae. The dynamical quantities appearing in the expressions
for the masses are fixed by fitting them to the masses of the baryon octet and
the masses of $\Omega^{-}$ and $\Theta^{+}$ as input rather than by extracting
them from a calculated self-consistent soliton profile. In particular, the
consideration of isospin symmetry breaking allows us to use the experimental
data of the whole octet baryon masses as input. We predict the masses of the
baryon decuplet and antidecuplet without any further adjustable free parameter.
In addition, we also obtain the pion-nucleon sigma term which turns out to be
$\Sigma_{\pi N} = 36.4\pm3.9\,\mathrm{MeV}$. We get the ratio of the current
light quark masses $R = 58.1\pm1.3$. The present results indicate that the
recent experimental data for the $\Theta^{+}(1524)$ are compatible with the
experimental data of the octet and decuplet masses.
|
[
{
"created": "Tue, 19 Oct 2010 03:57:15 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Nov 2010 06:34:25 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Apr 2012 10:29:51 GMT",
"version": "v3"
},
{
"created": "Fri, 29 Jun 2012 15:19:52 GMT",
"version": "v4"
}
] |
2012-09-03
|
[
[
"Yang",
"Ghil-Seok",
""
],
[
"Kim",
"Hyun-Chul",
""
]
] |
Considering simultaneously isospin and SU(3) flavor symmetry breakings, we investigate the complete mass splittings of SU(3) baryons within a chiral soliton model, a {}"model-independent approach" being employed. In linear order several new mass relations are derived, which are mostly generalizations of existing mass formulae. The dynamical quantities appearing in the expressions for the masses are fixed by fitting them to the masses of the baryon octet and the masses of $\Omega^{-}$ and $\Theta^{+}$ as input rather than by extracting them from a calculated self-consistent soliton profile. In particular, the consideration of isospin symmetry breaking allows us to use the experimental data of the whole octet baryon masses as input. We predict the masses of the baryon decuplet and antidecuplet without any further adjustable free parameter. In addition, we also obtain the pion-nucleon sigma term which turns out to be $\Sigma_{\pi N} = 36.4\pm3.9\,\mathrm{MeV}$. We get the ratio of the current light quark masses $R = 58.1\pm1.3$. The present results indicate that the recent experimental data for the $\Theta^{+}(1524)$ are compatible with the experimental data of the octet and decuplet masses.
|
2106.12825
|
Jani Penttala
|
Tuomas Lappi, Heikki M\"antysaari, Jani Penttala
|
Higher-order corrections to exclusive heavy vector meson production
|
Submission to SciPost, 6 pages, 2 figures
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present results for higher-order corrections to exclusive
$\mathrm{J}/\psi$ production. This includes the first relativistic correction
of order $v^2$ in quark velocity, and next-to-leading order corrections in
$\alpha_s$ for longitudinally polarized production. The relativistic
corrections are found to be important for a good description of the HERA data,
especially at small values of the photon virtuality. The next-to-leading order
results for longitudinal production are evaluated numerically. We also
demonstrate how the vector meson production provides complementary information
to the structure functions for extracting the initial condition for the
small-$x$ evolution of the dipole-proton scattering amplitude.
|
[
{
"created": "Thu, 24 Jun 2021 08:28:12 GMT",
"version": "v1"
}
] |
2021-06-25
|
[
[
"Lappi",
"Tuomas",
""
],
[
"Mäntysaari",
"Heikki",
""
],
[
"Penttala",
"Jani",
""
]
] |
We present results for higher-order corrections to exclusive $\mathrm{J}/\psi$ production. This includes the first relativistic correction of order $v^2$ in quark velocity, and next-to-leading order corrections in $\alpha_s$ for longitudinally polarized production. The relativistic corrections are found to be important for a good description of the HERA data, especially at small values of the photon virtuality. The next-to-leading order results for longitudinal production are evaluated numerically. We also demonstrate how the vector meson production provides complementary information to the structure functions for extracting the initial condition for the small-$x$ evolution of the dipole-proton scattering amplitude.
|
hep-ph/9410277
|
Raymond Robert Volkas
|
H. Lew and R. R. Volkas
|
New physics motivated by the low energy approach to electric charge
quantization
|
11 pages, UM-P-94/68, LaTeX
|
Phys.Rev. D51 (1995) 3849-3854
|
10.1103/PhysRevD.51.3849
| null |
hep-ph
| null |
The low-energy approach to electric charge quantization predicts physics
beyond the minimal standard model. A model-independent approach via effective
Lagrangians is used examine the possible new physics, which may manifest itself
indirectly through family-lepton--number violating rare decays.
|
[
{
"created": "Thu, 13 Oct 1994 13:12:00 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Lew",
"H.",
""
],
[
"Volkas",
"R. R.",
""
]
] |
The low-energy approach to electric charge quantization predicts physics beyond the minimal standard model. A model-independent approach via effective Lagrangians is used examine the possible new physics, which may manifest itself indirectly through family-lepton--number violating rare decays.
|
hep-ph/9612276
|
Borut Bajc
|
B. Bajc, S. Fajfer, Robert J. Oakes
|
SU(3) flavor symmetry breaking and semileptonic decays of heavy mesons
|
LaTex file, pages 16, no figures
| null | null |
IJS-TP-96/27, DTP/96/104, NUHEP-TH-96-8
|
hep-ph hep-ex
| null |
Assuming the ${\bar D}^0, D^-, D^-_s$ and $B^+, B^0, B_s^0$ mesons belong to
triplets of SU(3) flavor symmetry, we analyse the form factors in the
semileptonic decays of these mesons. Both quark and meson mass differences are
taken into account. We find a number of relations, in agreement with the
present data as well as with previous analyses, and predict certain ratios of
form factors, not yet measured, most notably the D meson decay constant $f_D =
209 \pm 39$ MeV.
|
[
{
"created": "Fri, 6 Dec 1996 18:09:25 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Bajc",
"B.",
""
],
[
"Fajfer",
"S.",
""
],
[
"Oakes",
"Robert J.",
""
]
] |
Assuming the ${\bar D}^0, D^-, D^-_s$ and $B^+, B^0, B_s^0$ mesons belong to triplets of SU(3) flavor symmetry, we analyse the form factors in the semileptonic decays of these mesons. Both quark and meson mass differences are taken into account. We find a number of relations, in agreement with the present data as well as with previous analyses, and predict certain ratios of form factors, not yet measured, most notably the D meson decay constant $f_D = 209 \pm 39$ MeV.
|
2406.18677
|
Duff Neill
|
Duff Neill, Hanqing Liu, Joshua Martin, and Alessandro Roggero
|
Scattering Neutrinos, Spin Models, and Permutations
|
26 pg., 3 app, multiple figs
| null | null |
LA-UR-24-25341
|
hep-ph cond-mat.stat-mech nucl-th quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a class of Heisenberg all-to-all coupled spin models inspired by
neutrino interactions in a supernova with $N$ degrees of freedom. These models
are characterized by a coupling matrix that is relatively simple in the sense
that there are only a few, relative to $N$, non-trivial eigenvalues, in
distinction to the classic Heisenberg spin-glass models, leading to distinct
behavior in both the high-temperature and low-temperature regimes. When the
momenta of the neutrinos are uniform and random in directions, we can calculate
the large-$N$ partition function for the quantum Heisenberg model. In
particular, the high-temperature partition function predicts a non-Gaussian
density of states, providing interesting counter-examples showing the limits of
general theorems on the density of states for quantum spin models. We can
repeat the same argument for classical Heisenberg models, also known as rotor
models, and we find the high-temperature expansion is completely controlled by
the eigenvalues of the coupling matrix, and again predicts non-Gaussian
behavior for the density of states as long as the number of eigenvalues does
not scale linearly with $N$. Indeed, we derive the amusing fact that these
\emph{thermodynamic} partition functions are essentially the generating
function for counting permutations in the high-temperature regime. Finally, for
the case relevant to neutrinos in a supernova, we identify the low-temperature
phase as a unique state with the direction of the momenta of the neutrino
dictating its coherent state in flavor-space, a state we dub the
"flavor-momentum-locked" state.
|
[
{
"created": "Wed, 26 Jun 2024 18:27:15 GMT",
"version": "v1"
}
] |
2024-06-28
|
[
[
"Neill",
"Duff",
""
],
[
"Liu",
"Hanqing",
""
],
[
"Martin",
"Joshua",
""
],
[
"Roggero",
"Alessandro",
""
]
] |
We consider a class of Heisenberg all-to-all coupled spin models inspired by neutrino interactions in a supernova with $N$ degrees of freedom. These models are characterized by a coupling matrix that is relatively simple in the sense that there are only a few, relative to $N$, non-trivial eigenvalues, in distinction to the classic Heisenberg spin-glass models, leading to distinct behavior in both the high-temperature and low-temperature regimes. When the momenta of the neutrinos are uniform and random in directions, we can calculate the large-$N$ partition function for the quantum Heisenberg model. In particular, the high-temperature partition function predicts a non-Gaussian density of states, providing interesting counter-examples showing the limits of general theorems on the density of states for quantum spin models. We can repeat the same argument for classical Heisenberg models, also known as rotor models, and we find the high-temperature expansion is completely controlled by the eigenvalues of the coupling matrix, and again predicts non-Gaussian behavior for the density of states as long as the number of eigenvalues does not scale linearly with $N$. Indeed, we derive the amusing fact that these \emph{thermodynamic} partition functions are essentially the generating function for counting permutations in the high-temperature regime. Finally, for the case relevant to neutrinos in a supernova, we identify the low-temperature phase as a unique state with the direction of the momenta of the neutrino dictating its coherent state in flavor-space, a state we dub the "flavor-momentum-locked" state.
|
1111.2312
|
A. H. Rezaeian
|
Amir H. Rezaeian
|
Charged particle multiplicities in pA interactions at the LHC from the
Color Glass Condensate
|
5 pages, 3 figures; v2: version improved. The version to appear in
PRD
|
Phys.Rev.D85:014028,2012
|
10.1103/PhysRevD.85.014028
| null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The forthcoming LHC measurement of hadron multiplicity in proton-nucleus
collisions is a crucial test of the k_t factorization and gluon saturation
based models. Here, we provide quantitative predictions for the pseudorapidity
distribution of charged particles produced in minimum bias proton-nucleus
collisions at the LHC based on the idea of gluon saturation in the color-glass
condensate framework. Our formulation gives good descriptions of the LHC and
RHIC data for the charged-hadron multiplicities in both proton-proton and
nucleus-nucleus collisions, and also the deep inelastic scattering at HERA at
small Bjorken-x.
|
[
{
"created": "Wed, 9 Nov 2011 19:48:04 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Jan 2012 17:55:47 GMT",
"version": "v2"
}
] |
2012-01-26
|
[
[
"Rezaeian",
"Amir H.",
""
]
] |
The forthcoming LHC measurement of hadron multiplicity in proton-nucleus collisions is a crucial test of the k_t factorization and gluon saturation based models. Here, we provide quantitative predictions for the pseudorapidity distribution of charged particles produced in minimum bias proton-nucleus collisions at the LHC based on the idea of gluon saturation in the color-glass condensate framework. Our formulation gives good descriptions of the LHC and RHIC data for the charged-hadron multiplicities in both proton-proton and nucleus-nucleus collisions, and also the deep inelastic scattering at HERA at small Bjorken-x.
|
0812.0788
|
Karsten Jedamzik
|
Sean Bailly, Karsten Jedamzik, Gilbert Moultaka
|
Gravitino Dark Matter and the Cosmic Lithium Abundances
|
13 pages (revtex), 9 figures, minor changes, submitted to PRD
|
Phys.Rev.D80:063509,2009
|
10.1103/PhysRevD.80.063509
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Supersymmetric extensions of the standard model of particle physics assuming
the gravitino to be the lightest supersymmetric particle (LSP), and with the
next-to-LSP decaying to the gravitino during Big Bang nucleosynthesis, are
analyzed. Particular emphasis is laid on their potential to solve the "Li7
problem", an apparent factor 2-4 overproduction of Li7 in standard Big Bang
nucleosynthesis (BBN), their production of cosmologically important amounts of
Li6, as well as the resulting gravitino dark matter densities in these models.
The study includes several improvements compared to prior studies. Heavy
gravitinos in the constrained minimal supersymmetric standard model (CMMSM) are
reanalyzed, whereas light gravitinos in gauge-mediated supersymmetry breaking
scenarios (GMSB) are studied for the first time. It is confirmed that decays of
NLSP staus to heavy gravitinos, while producing all the dark matter, may at the
same time resolve the Li7 problem. For NLSP decay times ~ 1000 sec, such
scenarios also lead to cosmologically important Li6 (and possibly Be9)
abundances. However, as such scenarios require heavy > 1 TeV staus they are
likely not testable at the LHC. It is found that decays of NLSP staus to light
gravitinos may lead to significant Li6 (and Be9) abundances, whereas NLSP
neutralinos decaying into light gravitinos may solve the Li7 problem. Though
both scenarios are testable at the LHC they may not lead to the production of
the bulk of the dark matter. A section of the paper outlines particle
properties required to significantly reduce the Li7 abundance, and/or enhance
the Li6 (and possibly Be9) abundances, by the decay of an arbitrary relic
particle.
|
[
{
"created": "Wed, 3 Dec 2008 19:59:44 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Mar 2009 17:52:41 GMT",
"version": "v2"
}
] |
2009-09-24
|
[
[
"Bailly",
"Sean",
""
],
[
"Jedamzik",
"Karsten",
""
],
[
"Moultaka",
"Gilbert",
""
]
] |
Supersymmetric extensions of the standard model of particle physics assuming the gravitino to be the lightest supersymmetric particle (LSP), and with the next-to-LSP decaying to the gravitino during Big Bang nucleosynthesis, are analyzed. Particular emphasis is laid on their potential to solve the "Li7 problem", an apparent factor 2-4 overproduction of Li7 in standard Big Bang nucleosynthesis (BBN), their production of cosmologically important amounts of Li6, as well as the resulting gravitino dark matter densities in these models. The study includes several improvements compared to prior studies. Heavy gravitinos in the constrained minimal supersymmetric standard model (CMMSM) are reanalyzed, whereas light gravitinos in gauge-mediated supersymmetry breaking scenarios (GMSB) are studied for the first time. It is confirmed that decays of NLSP staus to heavy gravitinos, while producing all the dark matter, may at the same time resolve the Li7 problem. For NLSP decay times ~ 1000 sec, such scenarios also lead to cosmologically important Li6 (and possibly Be9) abundances. However, as such scenarios require heavy > 1 TeV staus they are likely not testable at the LHC. It is found that decays of NLSP staus to light gravitinos may lead to significant Li6 (and Be9) abundances, whereas NLSP neutralinos decaying into light gravitinos may solve the Li7 problem. Though both scenarios are testable at the LHC they may not lead to the production of the bulk of the dark matter. A section of the paper outlines particle properties required to significantly reduce the Li7 abundance, and/or enhance the Li6 (and possibly Be9) abundances, by the decay of an arbitrary relic particle.
|
hep-ph/9303249
|
Michael Luke
|
Michael Luke and Martin J. Savage
|
Flavour Changing Neutral Currents, Weak-Scale Scalars and Rare Top
Decays
|
(some wording changed, and several references added) 13 pages, 2
figures included, uses harvmac.tex and epsf.tex, UCSD/PTH 93-01
|
Phys.Lett. B307 (1993) 387-393
|
10.1016/0370-2693(93)90238-D
| null |
hep-ph
| null |
We examine the decays $t\rightarrow c\gamma$ and $c Z^0$ in the Standard
Model with an extra scalar doublet and no discrete symmetry preventing
tree-level flavour changing neutral currents. The Yukawa couplings of the new
scalars are assumed to be proportional to fermion masses, evading bounds on
FCNC's from the light quark sector. These rare top decays may be visible at the
SSC.
|
[
{
"created": "Fri, 12 Mar 1993 07:11:13 GMT",
"version": "v1"
},
{
"created": "Wed, 12 May 1993 23:31:12 GMT",
"version": "v2"
},
{
"created": "Thu, 13 May 1993 16:50:30 GMT",
"version": "v3"
}
] |
2009-10-22
|
[
[
"Luke",
"Michael",
""
],
[
"Savage",
"Martin J.",
""
]
] |
We examine the decays $t\rightarrow c\gamma$ and $c Z^0$ in the Standard Model with an extra scalar doublet and no discrete symmetry preventing tree-level flavour changing neutral currents. The Yukawa couplings of the new scalars are assumed to be proportional to fermion masses, evading bounds on FCNC's from the light quark sector. These rare top decays may be visible at the SSC.
|
0912.2806
|
Per Osland
|
P. Osland, A. A. Pankov, A. V. Tsytrinov
|
Identification of extra neutral gauge bosons at the International Linear
Collider
|
21 pages
|
Eur.Phys.J.C67:191-204,2010
|
10.1140/epjc/s10052-010-1272-z
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Heavy neutral gauge bosons, Z's, are predicted by many theoretical schemes of
physics beyond the Standard Model, and intensive searches for their signatures
will be performed at present and future high energy colliders. It is quite
possible that Z's are heavy enough to lie beyond the discovery reach expected
at the CERN Large Hadron Collider LHC, in which case only indirect signatures
of Z' exchanges may occur at future colliders, through deviations of the
measured cross sections from the Standard Model predictions. We here discuss in
this context the foreseeable sensitivity to Z's of fermion-pair production
cross sections at an e^+e^- linear collider, especially as regards the
potential of distinguishing different Z' models once such deviations are
observed. Specifically, we assess the discovery and identification reaches on
Z' gauge bosons pertinent to the E_6, LR, ALR and SSM classes of models, that
should be attained at the planned International Linear Collider (ILC). With the
high experimental accuracies expected at the ILC, the discovery and the
identification reaches on the Z' models under consideration could be increased
substantially. In particular, the identification among the different models
could be achieved for values of Z' masses in the discovery (but beyond the
identification) reach of the LHC. An important role in enhancing such reaches
is played by the electron (and possibly the positron) longitudinally polarized
beams. Also, although the purely leptonic processes are experimentally cleaner,
the measurements of c- and b-quark pair production cross sections are found to
carry important, and complementary, information on these searches.
|
[
{
"created": "Tue, 15 Dec 2009 06:27:38 GMT",
"version": "v1"
}
] |
2014-11-20
|
[
[
"Osland",
"P.",
""
],
[
"Pankov",
"A. A.",
""
],
[
"Tsytrinov",
"A. V.",
""
]
] |
Heavy neutral gauge bosons, Z's, are predicted by many theoretical schemes of physics beyond the Standard Model, and intensive searches for their signatures will be performed at present and future high energy colliders. It is quite possible that Z's are heavy enough to lie beyond the discovery reach expected at the CERN Large Hadron Collider LHC, in which case only indirect signatures of Z' exchanges may occur at future colliders, through deviations of the measured cross sections from the Standard Model predictions. We here discuss in this context the foreseeable sensitivity to Z's of fermion-pair production cross sections at an e^+e^- linear collider, especially as regards the potential of distinguishing different Z' models once such deviations are observed. Specifically, we assess the discovery and identification reaches on Z' gauge bosons pertinent to the E_6, LR, ALR and SSM classes of models, that should be attained at the planned International Linear Collider (ILC). With the high experimental accuracies expected at the ILC, the discovery and the identification reaches on the Z' models under consideration could be increased substantially. In particular, the identification among the different models could be achieved for values of Z' masses in the discovery (but beyond the identification) reach of the LHC. An important role in enhancing such reaches is played by the electron (and possibly the positron) longitudinally polarized beams. Also, although the purely leptonic processes are experimentally cleaner, the measurements of c- and b-quark pair production cross sections are found to carry important, and complementary, information on these searches.
|
hep-ph/9506399
| null |
Zheng Huang (LBL)
|
Reinterpretation of Thermal Dilepton Emission Rate by Spectral Functions
|
12 pages in LaTeX, two uuencoded postscript figures
|
Phys.Lett. B361 (1995) 131-136
|
10.1016/0370-2693(95)01036-P
|
LBL-37426 UCB-PTH-95/20
|
hep-ph nucl-th
| null |
We reinterpret the dilepton emission rate from a hadronic gas expected to be
produced in heavy ion collisions in terms of the spectral functions available
from the $e^+e^-$ annihilation and the $\tau$ lepton decays experiments. We
take into account all possible hadronic state especially the multi-pion
contributions to the dilepton emission and the parity mixing phenomenon due to
the soft final-state corrections. A new compilation of the experimental data
for the spectral functions is presented.
|
[
{
"created": "Thu, 22 Jun 1995 23:48:16 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"Huang",
"Zheng",
"",
"LBL"
]
] |
We reinterpret the dilepton emission rate from a hadronic gas expected to be produced in heavy ion collisions in terms of the spectral functions available from the $e^+e^-$ annihilation and the $\tau$ lepton decays experiments. We take into account all possible hadronic state especially the multi-pion contributions to the dilepton emission and the parity mixing phenomenon due to the soft final-state corrections. A new compilation of the experimental data for the spectral functions is presented.
|
hep-ph/0612189
|
Frans Klinkhamer
|
F.R. Klinkhamer
|
Emergent Relativity: Neutrinos as Probe of the Underlying Theory
|
Talk presented at the Workshop on Exotic Physics with Neutrino
Telescopes, Uppsala, 20-22 September 2006
| null | null |
KA-TP-13-2006
|
hep-ph hep-ex hep-th
| null |
Neutrinos allow for a test of the hypothesis that the fermions of the
Standard Model have Fermi-point splitting, analogous to the fermionic
quasi-particles of certain condensed-matter systems. If present, the
corresponding Lorentz-violating terms in the Hamiltonian may provide a new
source of T and CP violation in the leptonic sector, which is not directly
related to mass.
|
[
{
"created": "Fri, 15 Dec 2006 12:31:56 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Klinkhamer",
"F. R.",
""
]
] |
Neutrinos allow for a test of the hypothesis that the fermions of the Standard Model have Fermi-point splitting, analogous to the fermionic quasi-particles of certain condensed-matter systems. If present, the corresponding Lorentz-violating terms in the Hamiltonian may provide a new source of T and CP violation in the leptonic sector, which is not directly related to mass.
|
1609.01401
|
Oliver Witzel
|
Anna Hasenfratz, Claudio Rebbi, and Oliver Witzel
|
Large scale separation and resonances within LHC range from a prototype
BSM model
|
6 pages, 3 figures. Version published in PLB, updated figures show in
addition data at a second beta value strengthening our conclusions
|
Physics Letters B 773C (2017) pp. 86-90
|
10.1016/j.physletb.2017.07.058
|
EDINBURGH 2016/15
|
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Many theories describing physics beyond the Standard Model rely on a large
separation of scales. Large scale separation arises in models with mass-split
flavors if the system is conformal in the ultraviolet but chirally broken in
the infrared. Because of the conformal fixed point, these systems exhibit
hyperscaling and a highly constrained resonance spectrum. We derive
hyperscaling relations and investigate the realization of one such system with
four light and eight heavy flavors. Our numerical simulations confirm that both
light-light and heavy-heavy resonance masses show hyperscaling and depend only
on the ratio of the light and heavy flavor masses. The heavy-heavy spectrum is
qualitatively different from QCD and exhibits quarkonia with masses not
proportional to the constituent quark mass. These resonances are only a few
times heavier than the light-light ones, which would put them within reach of
the LHC.
|
[
{
"created": "Tue, 6 Sep 2016 05:59:24 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Aug 2017 07:44:41 GMT",
"version": "v2"
}
] |
2017-08-22
|
[
[
"Hasenfratz",
"Anna",
""
],
[
"Rebbi",
"Claudio",
""
],
[
"Witzel",
"Oliver",
""
]
] |
Many theories describing physics beyond the Standard Model rely on a large separation of scales. Large scale separation arises in models with mass-split flavors if the system is conformal in the ultraviolet but chirally broken in the infrared. Because of the conformal fixed point, these systems exhibit hyperscaling and a highly constrained resonance spectrum. We derive hyperscaling relations and investigate the realization of one such system with four light and eight heavy flavors. Our numerical simulations confirm that both light-light and heavy-heavy resonance masses show hyperscaling and depend only on the ratio of the light and heavy flavor masses. The heavy-heavy spectrum is qualitatively different from QCD and exhibits quarkonia with masses not proportional to the constituent quark mass. These resonances are only a few times heavier than the light-light ones, which would put them within reach of the LHC.
|
hep-ph/9707268
| null |
Y. N. Srivastava and A. Widom
|
Of Course Muons Can Oscillate
|
Plain TeX Format, 7 pages, No figures
| null | null | null |
hep-ph
| null |
Recent theoretical claims not withstanding, muons can and do oscillate. Muons
produced in association with neutrinos (if masses and mixing angles are
nonzero) exhibit a joint oscillating spatial distribution. The possible use of
muon oscillations as a probe of neutrino mass and mixing parameters is
discussed using very simple physical arguments. Space-time oscillations in the
secondary decay vertices of muons (produced by pion decay) persist after
summing over all undetected neutrinos.
|
[
{
"created": "Mon, 7 Jul 1997 16:17:13 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Srivastava",
"Y. N.",
""
],
[
"Widom",
"A.",
""
]
] |
Recent theoretical claims not withstanding, muons can and do oscillate. Muons produced in association with neutrinos (if masses and mixing angles are nonzero) exhibit a joint oscillating spatial distribution. The possible use of muon oscillations as a probe of neutrino mass and mixing parameters is discussed using very simple physical arguments. Space-time oscillations in the secondary decay vertices of muons (produced by pion decay) persist after summing over all undetected neutrinos.
|
hep-ph/9602373
| null |
B. Bailey (Eckerd Collge), Edmond L. Berger, and L. E. Gordon
(Argonne)
|
Production of a Prompt Photon in Association with Charm at
Next-to-Leading Order in QCD
|
27 pages in RevTex plus 14 figures in one compressed PS file
|
Phys.Rev. D54 (1996) 1896-1907
|
10.1103/PhysRevD.54.1896
|
ANL-HEP-PR-95-87 and EC-HEP-960201
|
hep-ph
| null |
A second order, $O(\alpha ^2_s)$, calculation in perturbative quantum
chromodynamics of the two particle inclusive cross section is presented for the
reaction $p +\bar{p}\rightarrow \gamma + c + X$ for large values of the
transverse momentum of the prompt photon and charm quark. The combination of
analytic and Monte Carlo integration methods used here to perform phase-space
integrations facilitates imposition of photon isolation restrictions and other
selections of relevance in experiments. Differential distributions are provided
for various observables. Positive correlations in rapidity are predicted.
|
[
{
"created": "Thu, 22 Feb 1996 23:10:27 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Bailey",
"B.",
"",
"Eckerd Collge"
],
[
"Berger",
"Edmond L.",
"",
"Argonne"
],
[
"Gordon",
"L. E.",
"",
"Argonne"
]
] |
A second order, $O(\alpha ^2_s)$, calculation in perturbative quantum chromodynamics of the two particle inclusive cross section is presented for the reaction $p +\bar{p}\rightarrow \gamma + c + X$ for large values of the transverse momentum of the prompt photon and charm quark. The combination of analytic and Monte Carlo integration methods used here to perform phase-space integrations facilitates imposition of photon isolation restrictions and other selections of relevance in experiments. Differential distributions are provided for various observables. Positive correlations in rapidity are predicted.
|
hep-ph/9607456
|
Yong-Bin He
|
Y.B. He, W.Q. Chao, C.S. Gao and X.Q. Li
|
Cold Strangelets Formation with Finite Size Effects in High Energy
Heavy-Ion Collisions
|
19 pages(RevTex), 11 Postscript figures; To appear in Phys. Rev. C
|
Phys.Rev.C54:857-865,1996
|
10.1103/PhysRevC.54.857
|
CCAST-96-11
|
hep-ph nucl-th
| null |
We have studied the phase diagram and evolution of a strangelet in
equilibrium with a finite hadronic gas. Significant finite size modifications
of the phase diagram are found and their parameter dependences are studied.
With the inclusion of finite size effects we have also been able to obtain the
detailed properties of the cold strangelet emerging in the final stage of the
isentropic expansion of a finite strange fireball in high energy heavy-ion
collisions.
|
[
{
"created": "Mon, 29 Jul 1996 04:07:59 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"He",
"Y. B.",
""
],
[
"Chao",
"W. Q.",
""
],
[
"Gao",
"C. S.",
""
],
[
"Li",
"X. Q.",
""
]
] |
We have studied the phase diagram and evolution of a strangelet in equilibrium with a finite hadronic gas. Significant finite size modifications of the phase diagram are found and their parameter dependences are studied. With the inclusion of finite size effects we have also been able to obtain the detailed properties of the cold strangelet emerging in the final stage of the isentropic expansion of a finite strange fireball in high energy heavy-ion collisions.
|
1103.0882
|
Kaminski Robert
|
R. Kaminski
|
Dispersion relations with crossing symmetry for pipi D and F wave
amplitudes
|
11 pages, 6 figures
|
Phys.Rev.D83:076008,2011
|
10.1103/PhysRevD.83.076008
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A set of once subtracted dispersion relations with imposed crossing symmetry
condition for the pipi D- and F-wave amplitudes is derived and analyzed. An
example of numerical calculations in the effective two pion mass range from the
threshold to 1.1 GeV is presented. It is shown that these new dispersion
relations impose quite strong constraints on the analyzed pipi interactions and
are very useful tools to test the pipi amplitudes. One of the goals of this
work is to provide a complete set of equations required for easy use. Full
analytical expressions are presented. Along with the well known dispersion
relations successful in testing the pipi S- and P-wave amplitudes, those
presented here for the D and F waves give a complete set of tools for analyzes
of the pipi interactions.
|
[
{
"created": "Fri, 4 Mar 2011 12:16:12 GMT",
"version": "v1"
}
] |
2011-11-10
|
[
[
"Kaminski",
"R.",
""
]
] |
A set of once subtracted dispersion relations with imposed crossing symmetry condition for the pipi D- and F-wave amplitudes is derived and analyzed. An example of numerical calculations in the effective two pion mass range from the threshold to 1.1 GeV is presented. It is shown that these new dispersion relations impose quite strong constraints on the analyzed pipi interactions and are very useful tools to test the pipi amplitudes. One of the goals of this work is to provide a complete set of equations required for easy use. Full analytical expressions are presented. Along with the well known dispersion relations successful in testing the pipi S- and P-wave amplitudes, those presented here for the D and F waves give a complete set of tools for analyzes of the pipi interactions.
|
1605.09248
|
Bingfang Yang
|
Bingfang Yang, Jinzhong Han, Ning Liu
|
Lepton flavor violating Higgs decay $h\rightarrow \mu\tau$ in the
littlest Higgs Model with T-parity
|
The analytic expressions of the invariant amplitudes in Appendix B
are corrected
|
Phys. Rev. D 95, 035010 (2017)
|
10.1103/PhysRevD.95.035010
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Inspired by the recent CMS $h \to \mu\tau$ excess, we calculate the lepton
flavor violating Higgs decay $h \to \mu\tau$ in the littlest Higgs model with
T-parity (LHT). Under the constraints of $\ell_i \to \ell_j \gamma$, $Z \to
\ell_i \bar{\ell}_j$ and Higgs data, we find that the branching ratio of $h \to
\mu\tau$ can maximally reach $\mathcal O(10^{-4})$. We also investigate the
correlation between $h \to \mu\tau $, $\tau \to \mu \gamma$ and $Z \to
\mu\tau$, which can be used to test LHT model at future $e^+e^-$ colliders.
|
[
{
"created": "Mon, 30 May 2016 14:20:43 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Feb 2017 10:26:33 GMT",
"version": "v2"
},
{
"created": "Sun, 12 Feb 2017 12:55:45 GMT",
"version": "v3"
},
{
"created": "Sun, 7 Mar 2021 14:27:26 GMT",
"version": "v4"
}
] |
2021-03-09
|
[
[
"Yang",
"Bingfang",
""
],
[
"Han",
"Jinzhong",
""
],
[
"Liu",
"Ning",
""
]
] |
Inspired by the recent CMS $h \to \mu\tau$ excess, we calculate the lepton flavor violating Higgs decay $h \to \mu\tau$ in the littlest Higgs model with T-parity (LHT). Under the constraints of $\ell_i \to \ell_j \gamma$, $Z \to \ell_i \bar{\ell}_j$ and Higgs data, we find that the branching ratio of $h \to \mu\tau$ can maximally reach $\mathcal O(10^{-4})$. We also investigate the correlation between $h \to \mu\tau $, $\tau \to \mu \gamma$ and $Z \to \mu\tau$, which can be used to test LHT model at future $e^+e^-$ colliders.
|
1401.1162
|
Howard Baer
|
Howard Baer, Azar Mustafayev and Xerxes Tata
|
Monojets and mono-photons from light higgsino pair production at LHC14
|
10 pages plus 4 .eps figures; updated version to conform with
published version
|
Phys. Rev. D 89, 055007 (2014)
|
10.1103/PhysRevD.89.055007
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Naturalness arguments imply the existence of higgsinos lighter than 200-300
GeV. However, because these higgsinos are nearly mass degenerate, they release
very little visible energy in their decays, and signals from electroweak
higgsino pair production typically remain buried under Standard Model
backgrounds. Moreover, gluinos, squarks and winos may plausibly lie beyond the
reach of the LHC14, so that signals from naturalness-inspired supersymmetric
models may well remain hidden via conventional searches. We examine instead
prospects for detecting higgsino pair production via monojets or mono-photons
from initial state radiation. We find typical signal-to-background rates at
best at the 1 % level, leading to rather pessimistic conclusions regarding
detectability via these channels.
|
[
{
"created": "Mon, 6 Jan 2014 18:32:39 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Feb 2014 22:59:31 GMT",
"version": "v2"
}
] |
2014-03-19
|
[
[
"Baer",
"Howard",
""
],
[
"Mustafayev",
"Azar",
""
],
[
"Tata",
"Xerxes",
""
]
] |
Naturalness arguments imply the existence of higgsinos lighter than 200-300 GeV. However, because these higgsinos are nearly mass degenerate, they release very little visible energy in their decays, and signals from electroweak higgsino pair production typically remain buried under Standard Model backgrounds. Moreover, gluinos, squarks and winos may plausibly lie beyond the reach of the LHC14, so that signals from naturalness-inspired supersymmetric models may well remain hidden via conventional searches. We examine instead prospects for detecting higgsino pair production via monojets or mono-photons from initial state radiation. We find typical signal-to-background rates at best at the 1 % level, leading to rather pessimistic conclusions regarding detectability via these channels.
|
1210.5257
|
Piyush Kumar
|
Claudia Frugiuele, Thomas Gregoire, Piyush Kumar, Eduardo Ponton
|
"L=R" -- $U(1)_R$ Lepton Number at the LHC
|
44 pages, 28 figures
| null |
10.1007/JHEP05(2013)012
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a detailed study of a variety of LHC signals in supersymmetric
models where lepton number is promoted to an (approximate) U(1)_R symmetry.
Such a symmetry has interesting implications for naturalness, as well as
flavor- and CP-violation, among others. Interestingly, it makes large sneutrino
vacuum expectation values phenomenologically viable, so that a slepton doublet
can play the role of the down-type Higgs. As a result, (some of) the leptons
and neutrinos are incorporated into the chargino and neutralino sectors. This
leads to characteristic decay patterns that can be experimentally tested at the
LHC. The corresponding collider phenomenology is largely determined by the new
approximately conserved quantum number, which is itself closely tied to the
presence of "leptonic R-parity violation". We find rather loose bounds on the
first and second generation squarks, arising from a combination of suppressed
production rates together with relatively small signal efficiencies of the
current searches. Naturalness would indicate that such a framework should be
discovered in the near future, perhaps through spectacular signals exhibiting
the lepto-quark nature of the third generation squarks. The presence of fully
visible decays, in addition to decay chains involving large missing energy (in
the form of neutrinos) could give handles to access the details of the spectrum
of new particles, if excesses over SM background were to be observed. The scale
of neutrino masses is intimately tied to the source of U(1)_R breaking, thus
opening a window into the R-breaking sector through neutrino physics. Further
theoretical aspects of the model have been presented in a recent companion
paper.
|
[
{
"created": "Thu, 18 Oct 2012 20:37:50 GMT",
"version": "v1"
}
] |
2015-06-11
|
[
[
"Frugiuele",
"Claudia",
""
],
[
"Gregoire",
"Thomas",
""
],
[
"Kumar",
"Piyush",
""
],
[
"Ponton",
"Eduardo",
""
]
] |
We perform a detailed study of a variety of LHC signals in supersymmetric models where lepton number is promoted to an (approximate) U(1)_R symmetry. Such a symmetry has interesting implications for naturalness, as well as flavor- and CP-violation, among others. Interestingly, it makes large sneutrino vacuum expectation values phenomenologically viable, so that a slepton doublet can play the role of the down-type Higgs. As a result, (some of) the leptons and neutrinos are incorporated into the chargino and neutralino sectors. This leads to characteristic decay patterns that can be experimentally tested at the LHC. The corresponding collider phenomenology is largely determined by the new approximately conserved quantum number, which is itself closely tied to the presence of "leptonic R-parity violation". We find rather loose bounds on the first and second generation squarks, arising from a combination of suppressed production rates together with relatively small signal efficiencies of the current searches. Naturalness would indicate that such a framework should be discovered in the near future, perhaps through spectacular signals exhibiting the lepto-quark nature of the third generation squarks. The presence of fully visible decays, in addition to decay chains involving large missing energy (in the form of neutrinos) could give handles to access the details of the spectrum of new particles, if excesses over SM background were to be observed. The scale of neutrino masses is intimately tied to the source of U(1)_R breaking, thus opening a window into the R-breaking sector through neutrino physics. Further theoretical aspects of the model have been presented in a recent companion paper.
|
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