id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0010137 | Michael Kraemer | Michael Kr\"amer (University of Edinburgh) | J/psi and psi(2S) Production and Polarization at the Tevatron | 6 pages, 4 figures. Talk presented at the 4th International
Conference on Hyperons, Charm and Beauty Hadrons, Valencia, Spain, 27-30 June
2000. To be published in the proceedings. Revised version has updated
reference section | Nucl.Phys.Proc.Suppl.93:176-181,2001 | 10.1016/S0920-5632(00)01098-7 | null | hep-ph | null | The NRQCD factorization approach for quarkonium production at hadron
colliders is reviewed. The prediction of J/psi and psi(2S) transverse
polarization at large transverse momentum is confronted with recent
experimental data, and potential shortcomings of the theoretical analysis are
discussed.
| [
{
"created": "Fri, 13 Oct 2000 14:45:19 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Oct 2000 12:48:43 GMT",
"version": "v2"
}
] | 2009-04-13 | [
[
"Krämer",
"Michael",
"",
"University of Edinburgh"
]
] | The NRQCD factorization approach for quarkonium production at hadron colliders is reviewed. The prediction of J/psi and psi(2S) transverse polarization at large transverse momentum is confronted with recent experimental data, and potential shortcomings of the theoretical analysis are discussed. |
2210.02226 | Manuel Szewc | Jernej F. Kamenik, Manuel Szewc | Null Hypothesis Test for Anomaly Detection | 10 pages, 3 figures, 1 Table. Matches published version at Physics
Letters B. All code is available at
https://github.com/ManuelSzewc/Null_Hypothesis_Test_for_Anomaly_Detection.
Comments welcome! | Physics Letters B, 840, 2023, 137836 | 10.1016/j.physletb.2023.137836 | null | hep-ph cs.LG hep-ex | http://creativecommons.org/licenses/by/4.0/ | We extend the use of Classification Without Labels for anomaly detection with
a hypothesis test designed to exclude the background-only hypothesis. By
testing for statistical independence of the two discriminating dataset regions,
we are able to exclude the background-only hypothesis without relying on fixed
anomaly score cuts or extrapolations of background estimates between regions.
The method relies on the assumption of conditional independence of anomaly
score features and dataset regions, which can be ensured using existing
decorrelation techniques. As a benchmark example, we consider the LHC Olympics
dataset where we show that mutual information represents a suitable test for
statistical independence and our method exhibits excellent and robust
performance at different signal fractions even in presence of realistic feature
correlations.
| [
{
"created": "Wed, 5 Oct 2022 13:03:55 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Oct 2022 10:33:47 GMT",
"version": "v2"
},
{
"created": "Wed, 15 Mar 2023 12:17:54 GMT",
"version": "v3"
}
] | 2023-03-16 | [
[
"Kamenik",
"Jernej F.",
""
],
[
"Szewc",
"Manuel",
""
]
] | We extend the use of Classification Without Labels for anomaly detection with a hypothesis test designed to exclude the background-only hypothesis. By testing for statistical independence of the two discriminating dataset regions, we are able to exclude the background-only hypothesis without relying on fixed anomaly score cuts or extrapolations of background estimates between regions. The method relies on the assumption of conditional independence of anomaly score features and dataset regions, which can be ensured using existing decorrelation techniques. As a benchmark example, we consider the LHC Olympics dataset where we show that mutual information represents a suitable test for statistical independence and our method exhibits excellent and robust performance at different signal fractions even in presence of realistic feature correlations. |
0804.0368 | Igor M. Suslov | I. M. Suslov, (P.L.Kapitza Institute for Physical Problems, Moscow,
Russia) | Analytical asymptotics of \beta-function in \phi^4 theory (end of the
"zero charge" story) | Latex, 16 pages, 2 figures included | null | null | null | hep-ph cond-mat.stat-mech hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Reconstruction of the \beta-function for \phi^4 theory, attempted previously
by summation of perturbation series, leads to asymptotics \beta(g)=\beta_\infty
g^\alpha at g\to\infty, where \alpha\approx 1 for space dimensions d=2,3,4. The
natural hypothesis arises, that asymptotic behavior is \beta(g) \sim g for all
d. Consideration of the zero-dimensional case confirms the hypothesis and
reveals the origin of this result: it is related with a zero of a certain
functional integral. Consideration can be generalized to the arbitrary space
dimensionality, confirming the linear asymptotics of \beta(g) for all d.
Asymptotical behavior for other renormalization group functions (anomalous
dimensions) is found to be constant. Relation to the "zero charge" problem is
discussed.
| [
{
"created": "Wed, 2 Apr 2008 14:57:00 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Oct 2008 14:06:15 GMT",
"version": "v2"
},
{
"created": "Sun, 1 Nov 2009 12:16:47 GMT",
"version": "v3"
},
{
"created": "Sat, 16 Oct 2010 23:28:37 GMT",
"version": "v4"
}
] | 2010-10-19 | [
[
"Suslov",
"I. M.",
""
]
] | Reconstruction of the \beta-function for \phi^4 theory, attempted previously by summation of perturbation series, leads to asymptotics \beta(g)=\beta_\infty g^\alpha at g\to\infty, where \alpha\approx 1 for space dimensions d=2,3,4. The natural hypothesis arises, that asymptotic behavior is \beta(g) \sim g for all d. Consideration of the zero-dimensional case confirms the hypothesis and reveals the origin of this result: it is related with a zero of a certain functional integral. Consideration can be generalized to the arbitrary space dimensionality, confirming the linear asymptotics of \beta(g) for all d. Asymptotical behavior for other renormalization group functions (anomalous dimensions) is found to be constant. Relation to the "zero charge" problem is discussed. |
hep-ph/0403293 | Cristina Volpe | Julien Serreau (University of Heidelberg, Germany) and Cristina Volpe
(Institut de Physique Nucl\'eaire Orsay, France) | Neutrino-nucleus interaction rates at a low-energy beta-beam facility | 6 pages, 3 figures | Phys.Rev. C70 (2004) 055502 | 10.1103/PhysRevC.70.055502 | HD-THEP-04-13 | hep-ph astro-ph nucl-ex nucl-th | null | We compute the neutrino detection rates to be expected at a low-energy
beta-beam facility. We consider various nuclei as neutrino detectors and
compare the case of a small versus large storage ring.
| [
{
"created": "Tue, 30 Mar 2004 18:18:19 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Oct 2004 22:49:47 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Serreau",
"Julien",
"",
"University of Heidelberg, Germany"
],
[
"Volpe",
"Cristina",
"",
"Institut de Physique Nucléaire Orsay, France"
]
] | We compute the neutrino detection rates to be expected at a low-energy beta-beam facility. We consider various nuclei as neutrino detectors and compare the case of a small versus large storage ring. |
hep-ph/0204211 | Dam Thanh Son | R.Baier, A.H.Mueller, D.Schiff and D.T.Son | Does parton saturation at high density explain hadron multiplicities at
RHIC ? | 8 pages | Phys.Lett. B539 (2002) 46-52 | 10.1016/S0370-2693(02)02037-3 | null | hep-ph nucl-th | null | We discuss the recent claim that hadron multiplicities measured at RHIC
energies are directly described in terms of gluon degrees of freedom fixed from
the initial conditions of central heavy ion collisions. The argument is based
on the parton saturation scenario expected to be valid at high parton densities
and on the assumption of conserved gluon number. Alternatively we conjecture
that "bottom-up" equilibration before hadronization modifies this picture, due
to nonconservation of the number of gluons.
| [
{
"created": "Thu, 18 Apr 2002 04:10:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Baier",
"R.",
""
],
[
"Mueller",
"A. H.",
""
],
[
"Schiff",
"D.",
""
],
[
"Son",
"D. T.",
""
]
] | We discuss the recent claim that hadron multiplicities measured at RHIC energies are directly described in terms of gluon degrees of freedom fixed from the initial conditions of central heavy ion collisions. The argument is based on the parton saturation scenario expected to be valid at high parton densities and on the assumption of conserved gluon number. Alternatively we conjecture that "bottom-up" equilibration before hadronization modifies this picture, due to nonconservation of the number of gluons. |
2309.11094 | Jin Zhang | Jin Zhang, Hong-Ying Jin and T. G. Steele | The $H\rightarrow b\bar{s}$ decay and its implication for the
vector-like singlet fermion model | 34 pages, 8 figures, second revised | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The vector-like quark model is one of the extensions of the standard model
(SM) of particle physics. The simplest version of this model introduces a
vector-like singlet quark which can mix with SM quarks and give rise to new
contributions to the flavor-changing decays of the Higgs boson. In this work we
first present a systematic analysis of the branching ratios of the decays
$H\rightarrow b\bar{s}, b\bar{d}$ at leading order in the standard model. Our
results show that it is challenging to observe these two modes because of their
small branching ratios. Then augmenting the SM with a vector-like singlet top
quark, assuming the top partner only mixes with the top quark, complete
one-loop contributions are taken into account in the amplitudes. Further
results indicate that the branching ratios of the decays $H\rightarrow
b\bar{s}, b\bar{d}$ are sensitive to the mass of the top partner $M_{T}$ and
the mixing effects characterized by $\sin\theta_{L}$. By tuning the values of
$M_{T}$ and $\sin\theta_{L}$, the branching ratios may rise to a level
accessible to LHC experiments. Combined with the branching ratios obtained from
a probabilistic model, the allowed areas in the $M_{T}-\sin\theta_{L}$ plane
are displayed. Tagging efficiencies and feasibility for detecting $H\rightarrow
b\bar{s}$ are specifically discussed and we conclude that with large statistics
it is promising to discover the $H\rightarrow b\bar{s}$ decay at the LHC.
| [
{
"created": "Wed, 20 Sep 2023 06:56:25 GMT",
"version": "v1"
},
{
"created": "Wed, 8 May 2024 15:24:05 GMT",
"version": "v2"
}
] | 2024-05-09 | [
[
"Zhang",
"Jin",
""
],
[
"Jin",
"Hong-Ying",
""
],
[
"Steele",
"T. G.",
""
]
] | The vector-like quark model is one of the extensions of the standard model (SM) of particle physics. The simplest version of this model introduces a vector-like singlet quark which can mix with SM quarks and give rise to new contributions to the flavor-changing decays of the Higgs boson. In this work we first present a systematic analysis of the branching ratios of the decays $H\rightarrow b\bar{s}, b\bar{d}$ at leading order in the standard model. Our results show that it is challenging to observe these two modes because of their small branching ratios. Then augmenting the SM with a vector-like singlet top quark, assuming the top partner only mixes with the top quark, complete one-loop contributions are taken into account in the amplitudes. Further results indicate that the branching ratios of the decays $H\rightarrow b\bar{s}, b\bar{d}$ are sensitive to the mass of the top partner $M_{T}$ and the mixing effects characterized by $\sin\theta_{L}$. By tuning the values of $M_{T}$ and $\sin\theta_{L}$, the branching ratios may rise to a level accessible to LHC experiments. Combined with the branching ratios obtained from a probabilistic model, the allowed areas in the $M_{T}-\sin\theta_{L}$ plane are displayed. Tagging efficiencies and feasibility for detecting $H\rightarrow b\bar{s}$ are specifically discussed and we conclude that with large statistics it is promising to discover the $H\rightarrow b\bar{s}$ decay at the LHC. |
1011.5564 | Lei Wu | Junjie Cao, Lei Wu, Jin Min Yang | New physics effects on top quark spin correlation and polarization at
the LHC: a comparative study in different models | Version in PRD (figs updated and discussions added) | Phys.Rev.D83:034024,2011 | 10.1103/PhysRevD.83.034024 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Extensions of the Standard Model often predict new chiral interactions for
top quark, which will contribute to top quark spin correlation and polarization
in $t\bar{t}$ production at the LHC. In this work, under the constraints from
the current Tevatron measurements, a comparative study of the spin correlation
and polarization is performed in three new physics models: the minimal
supersymmetric model without R-parity (RPV-MSSM), the third-generation enhanced
left-right model and the axigluon model. We find that the polarization
asymmetry may be enhanced to the accessible level in all these models while the
correction to the spin correlation may be detectable in the axigluon model and
the RPV-MSSM with $\lambda"$ couplings.
| [
{
"created": "Thu, 25 Nov 2010 08:17:07 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Feb 2011 10:57:26 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Cao",
"Junjie",
""
],
[
"Wu",
"Lei",
""
],
[
"Yang",
"Jin Min",
""
]
] | Extensions of the Standard Model often predict new chiral interactions for top quark, which will contribute to top quark spin correlation and polarization in $t\bar{t}$ production at the LHC. In this work, under the constraints from the current Tevatron measurements, a comparative study of the spin correlation and polarization is performed in three new physics models: the minimal supersymmetric model without R-parity (RPV-MSSM), the third-generation enhanced left-right model and the axigluon model. We find that the polarization asymmetry may be enhanced to the accessible level in all these models while the correction to the spin correlation may be detectable in the axigluon model and the RPV-MSSM with $\lambda"$ couplings. |
1203.2419 | Eugene Levin | E. Gotsman (Tel Aviv Un.), E. Levin (Tel Aviv Un, UTFSM) and U. Maor
(Tel Aviv UN.) | Soft interaction model and the LHC data | 12 pp, 12 figures in .eps files | null | 10.1103/PhysRevD.85.094007 | TAUP-2145/12 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Most models for soft interactions which were proposed prior to the
measurements at the LHC, are only marginally compatible with LHC data, our GLM
model has the same deficiency. In this paper we investigate possible causes of
the problem, by considering separate fits to the high energy ($W > 500\, GeV$),
and low energy ($W < 500\, GeV$) data. Our new results are moderately higher
than our previous predictions. Our results for total and elastic cross sections
are systematically lower that the recent Totem and Alice published values,
while our results for the inelastic and forward slope agree with the data. If
with additional experimental data, the errors are reduced, while the central
cross section values remain unchanged, we will need to reconsider the physics
on which our model is built.
| [
{
"created": "Mon, 12 Mar 2012 07:53:05 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Apr 2012 18:29:09 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Gotsman",
"E.",
"",
"Tel Aviv Un."
],
[
"Levin",
"E.",
"",
"Tel Aviv Un, UTFSM"
],
[
"Maor",
"U.",
"",
"Tel Aviv UN."
]
] | Most models for soft interactions which were proposed prior to the measurements at the LHC, are only marginally compatible with LHC data, our GLM model has the same deficiency. In this paper we investigate possible causes of the problem, by considering separate fits to the high energy ($W > 500\, GeV$), and low energy ($W < 500\, GeV$) data. Our new results are moderately higher than our previous predictions. Our results for total and elastic cross sections are systematically lower that the recent Totem and Alice published values, while our results for the inelastic and forward slope agree with the data. If with additional experimental data, the errors are reduced, while the central cross section values remain unchanged, we will need to reconsider the physics on which our model is built. |
hep-ph/9810495 | Sergey Troshin | Sergey Troshin, Nikolai Tyurin | Beyond the black disk limit: from shadow to antishadow scattering mode | 25 pages, 2 figures | Phys.Part.Nucl. 30 (1999) 550-559 | 10.1134/1.953118 | null | hep-ph hep-ex | null | New mode in the hadron scattering is predicted to appear at the energies
beyond $\sqrt{s}\simeq 2$ TeV: the antishadow scattering mode and the
experiments at LHC and VLHC in hadronic reactions will be able to reveal it.
The appearance of the antishadow scattering mode at these energies is
considered on the basis of unitarity and geometrical notions of hadron
interactions. Connections with the nonperturbative--QCD models are discussed.
| [
{
"created": "Tue, 27 Oct 1998 10:58:24 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Troshin",
"Sergey",
""
],
[
"Tyurin",
"Nikolai",
""
]
] | New mode in the hadron scattering is predicted to appear at the energies beyond $\sqrt{s}\simeq 2$ TeV: the antishadow scattering mode and the experiments at LHC and VLHC in hadronic reactions will be able to reveal it. The appearance of the antishadow scattering mode at these energies is considered on the basis of unitarity and geometrical notions of hadron interactions. Connections with the nonperturbative--QCD models are discussed. |
1603.02002 | Jing-Yu Zhu | Zhi-zhong Xing, Jing-yu Zhu | Analytical approximations for matter effects on CP violation in the
accelerator-based neutrino oscillations with E \lesssim 1 GeV | 36 pages, 11 figures. A crucial mistake removed, highlights changed,
and a comparison with Freund's result made | null | 10.1007/JHEP07(2016)011 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Given an accelerator-based neutrino experiment with the beam energy E
\lesssim 1 GeV, we expand the probabilities of \nu_\mu \to \nu_e and \overline
{\nu}_\mu \to \overline {\nu}_e oscillations in matter in terms of two small
quantities \Delta_{21}/\Delta_{31} and A/\Delta_{31}, where \Delta_{21} \equiv
m^2_2 - m^2_1 and \Delta_{31} \equiv m^2_3 - m^2_1 are the neutrino
mass-squared differences, and A measures the strength of terrestrial matter
effects. Our analytical approximations are numerically more accurate than those
made by Freund in this energy region, and thus they are particularly applicable
for the study of leptonic CP violation in the low-energy MOMENT, ESS\nuSM and
T2K oscillation experiments. As a by-product, the new analytical approximations
help us to easily understand why the matter-corrected Jarlskog parameter
\widetilde{\cal J} peaks at the resonance energy E_* \simeq 0.14 GeV (or 0.12
GeV) for the normal (or inverted) neutrino mass hierarchy, and how the three
Dirac unitarity triangles are deformed due to the terrestrial matter
contamination. We also affirm that a medium-baseline neutrino oscillation
experiment with the beam energy E lying in the E_* \lesssim E \lesssim 2 E_*
range is capable of exploring leptonic CP violation with little matter-induced
suppression.
| [
{
"created": "Mon, 7 Mar 2016 11:02:05 GMT",
"version": "v1"
},
{
"created": "Sun, 22 May 2016 11:31:10 GMT",
"version": "v2"
}
] | 2016-07-20 | [
[
"Xing",
"Zhi-zhong",
""
],
[
"Zhu",
"Jing-yu",
""
]
] | Given an accelerator-based neutrino experiment with the beam energy E \lesssim 1 GeV, we expand the probabilities of \nu_\mu \to \nu_e and \overline {\nu}_\mu \to \overline {\nu}_e oscillations in matter in terms of two small quantities \Delta_{21}/\Delta_{31} and A/\Delta_{31}, where \Delta_{21} \equiv m^2_2 - m^2_1 and \Delta_{31} \equiv m^2_3 - m^2_1 are the neutrino mass-squared differences, and A measures the strength of terrestrial matter effects. Our analytical approximations are numerically more accurate than those made by Freund in this energy region, and thus they are particularly applicable for the study of leptonic CP violation in the low-energy MOMENT, ESS\nuSM and T2K oscillation experiments. As a by-product, the new analytical approximations help us to easily understand why the matter-corrected Jarlskog parameter \widetilde{\cal J} peaks at the resonance energy E_* \simeq 0.14 GeV (or 0.12 GeV) for the normal (or inverted) neutrino mass hierarchy, and how the three Dirac unitarity triangles are deformed due to the terrestrial matter contamination. We also affirm that a medium-baseline neutrino oscillation experiment with the beam energy E lying in the E_* \lesssim E \lesssim 2 E_* range is capable of exploring leptonic CP violation with little matter-induced suppression. |
0709.2269 | John F. Gunion | Radovan Dermisek (IAS) and John F. Gunion (U.C. Davis) | A Comparison of Mixed-Higgs Scenarios In the NMSSM and the MSSM | 14 pages, 19 figures | Phys.Rev.D77:015013,2008 | 10.1103/PhysRevD.77.015013 | null | hep-ph | null | We study scenarios in the minimal and next-to minimal supersymmetric models
in which the lightest CP-even Higgs boson can have mass below the 114 GeV
standard model LEP limit by virtue of reduced ZZ coupling due to substantial
mixing among the Higgs bosons. We pay particular attention to the size of
corrections from superpartners needed for these scenarios to be viable and
point to boundary conditions at large scales which lead to these scenarios
while at the same time keeping electroweak fine tuning modest in size. We find
that naturalness of electroweak symmetry breaking in the mixed-Higgs scenarios
of both models points to the same region of soft supersymmetry breaking terms,
namely those leading to large mixing in the stop sector at the electroweak
scale, especially if we also require that the lightest CP-even Higgs explains
the Higgs-like LEP events at about 98 GeV.
| [
{
"created": "Thu, 13 Sep 2007 23:20:34 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Dermisek",
"Radovan",
"",
"IAS"
],
[
"Gunion",
"John F.",
"",
"U.C. Davis"
]
] | We study scenarios in the minimal and next-to minimal supersymmetric models in which the lightest CP-even Higgs boson can have mass below the 114 GeV standard model LEP limit by virtue of reduced ZZ coupling due to substantial mixing among the Higgs bosons. We pay particular attention to the size of corrections from superpartners needed for these scenarios to be viable and point to boundary conditions at large scales which lead to these scenarios while at the same time keeping electroweak fine tuning modest in size. We find that naturalness of electroweak symmetry breaking in the mixed-Higgs scenarios of both models points to the same region of soft supersymmetry breaking terms, namely those leading to large mixing in the stop sector at the electroweak scale, especially if we also require that the lightest CP-even Higgs explains the Higgs-like LEP events at about 98 GeV. |
2301.08267 | Caner Unal | Caner Unal | Accretion, Evaporation and Superradiance Phase Diagram of (Primordial)
Black Holes and $10^{-21}-10^{21}$ eV Scalar, Vector, Tensor Fields | 7 pages, 5 figures, accepted for publication | null | null | null | hep-ph astro-ph.CO astro-ph.HE gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain the accretion, evaporation and superradiance phase diagram of
astrophysical and primordial black holes in the mass range $10^{-33}-10^{11} \,
M_\odot $. This black hole mass range corresponds to production of $10^{-21} -
10^{21}$ eV particles for superradiance (bosons) and evaporation (bosons and
fermions). Only accretion and superradiance processes are relevant for heavy
black holes, on the other hand for light black holes of primordial origin, all
three processes can be relevant. We find that superradiance instability can
happen even for black hole spin values as low as $10^{-9}-10^{-2}$. Since light
black holes are very unstable to these perturbations and sensitive probes of
bosonic particles, a single moderately spinning BH can probe 2-9 orders of
magnitude of mass parameter space depending on the nature of the perturbations
that are scalar (axion), vector (dark photon and/or photon with effective mass)
and spin-2. If spinning black holes are observed, namely superradiance is not
observed, due to self-interactions, we find limits on the axion decay constant
and energy density.
| [
{
"created": "Thu, 19 Jan 2023 19:00:30 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Mar 2023 20:23:15 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Jul 2024 09:26:13 GMT",
"version": "v3"
}
] | 2024-07-25 | [
[
"Unal",
"Caner",
""
]
] | We obtain the accretion, evaporation and superradiance phase diagram of astrophysical and primordial black holes in the mass range $10^{-33}-10^{11} \, M_\odot $. This black hole mass range corresponds to production of $10^{-21} - 10^{21}$ eV particles for superradiance (bosons) and evaporation (bosons and fermions). Only accretion and superradiance processes are relevant for heavy black holes, on the other hand for light black holes of primordial origin, all three processes can be relevant. We find that superradiance instability can happen even for black hole spin values as low as $10^{-9}-10^{-2}$. Since light black holes are very unstable to these perturbations and sensitive probes of bosonic particles, a single moderately spinning BH can probe 2-9 orders of magnitude of mass parameter space depending on the nature of the perturbations that are scalar (axion), vector (dark photon and/or photon with effective mass) and spin-2. If spinning black holes are observed, namely superradiance is not observed, due to self-interactions, we find limits on the axion decay constant and energy density. |
0901.0408 | Jean-Michel Levy | Jean-Michel Levy | On ultra-relativistic approximations, unobservable phases and other
hand-waving in the derivation of the neutrino oscillation length | 11 pages, no figure | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A wrong derivation of the phase of a propagating massive particle which has
repeatedly appeared during the last years has the advantage of leading once
more to the important question of the phase difference between the mass
eigenstates constitutive of an oscillating neutrino described in the plane wave
formalism. Serious errors of principle are pointed at in a number of simple
calculations and the oscillation length is derived in a way which allows to
show that the standard result can suffer but minute variations in the
ultrarelativistic case.
| [
{
"created": "Mon, 5 Jan 2009 15:17:30 GMT",
"version": "v1"
}
] | 2009-01-06 | [
[
"Levy",
"Jean-Michel",
""
]
] | A wrong derivation of the phase of a propagating massive particle which has repeatedly appeared during the last years has the advantage of leading once more to the important question of the phase difference between the mass eigenstates constitutive of an oscillating neutrino described in the plane wave formalism. Serious errors of principle are pointed at in a number of simple calculations and the oscillation length is derived in a way which allows to show that the standard result can suffer but minute variations in the ultrarelativistic case. |
hep-ph/9502257 | Oleg Tarasov | J. Fleischer, and O.V. Tarasov | ALGORITHMIC CALCULATION OF TWO-LOOP FEYNMAN DIAGRAMS | 15 pages, to print figures 'axodraw.sty' is required, it can be
obtained at ftp://nikhefh.nikhef.nl//axodraw/ | null | null | BI-TP 94/61 | hep-ph | null | In a recent paper \cite{ft} a new powerful method to calculate Feynman
diagrams was proposed. It consists in setting up a Taylor series expansion in
the external momenta squared. The Taylor coefficients are obtained from the
original diagram by differentiation and putting the external momenta equal to
zero. It was demonstrated that by a certain conformal mapping and subsequent
resummation by means of Pad\'{e} approximants it is possible to obtain high
precision numerical values of the Feynman integrals in the whole cut plane. The
real problem in this approach is the calculation of the Taylor coefficients for
the arbitrary mass case. Since their analytic evaluation by means of CA
packages uses enormous CPU and yields very lengthy expressions, we develop an
algorithm with the aim to set up a FORTRAN package for their numerical
evaluation. This development is guided by the possibilities offered by the
formulae manipulating language FORM \cite{FORM}.
| [
{
"created": "Wed, 8 Feb 1995 20:36:46 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Fleischer",
"J.",
""
],
[
"Tarasov",
"O. V.",
""
]
] | In a recent paper \cite{ft} a new powerful method to calculate Feynman diagrams was proposed. It consists in setting up a Taylor series expansion in the external momenta squared. The Taylor coefficients are obtained from the original diagram by differentiation and putting the external momenta equal to zero. It was demonstrated that by a certain conformal mapping and subsequent resummation by means of Pad\'{e} approximants it is possible to obtain high precision numerical values of the Feynman integrals in the whole cut plane. The real problem in this approach is the calculation of the Taylor coefficients for the arbitrary mass case. Since their analytic evaluation by means of CA packages uses enormous CPU and yields very lengthy expressions, we develop an algorithm with the aim to set up a FORTRAN package for their numerical evaluation. This development is guided by the possibilities offered by the formulae manipulating language FORM \cite{FORM}. |
1902.01312 | Valery Lyubovitskij | Thomas Gutsche, Valery E. Lyubovitskij, Ivan Schmidt, Andrey Yu.
Trifonov | Mesons in a soft-wall AdS-Schwarzschild approach at low temperature | 12 pages | Phys. Rev. D 99, 054030 (2019) | 10.1103/PhysRevD.99.054030 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a holographic soft-wall approach in five dimensional
AdS-Schwarzschild space for the description of mesons at finite temperature. In
this first application we consider the small temperature limit and derive
analytical expression for the mass spectrum of mesons with adjustable quantum
numbers $n$ (radial number), $L$ (angular orbital momentum) and $J$ (total
angular momentum). We explicitly separate the contribution at zero temperature
and the leading order temperature correction. The temperature corrections arise
from the temperature dependence of the dilaton parameter (which is the
parameter of spontaneous breaking of chiral symmetry related to the
pseudoscalar meson decay constant) and the warping of the AdS metric due to
temperature. We extend our results to any hadron with integer spin
(tetraquarks, dibaryons, etc.). We present numerical analysis for the
temperature dependence of meson masses and form factors.
| [
{
"created": "Mon, 4 Feb 2019 17:08:24 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Apr 2019 11:29:11 GMT",
"version": "v2"
}
] | 2019-04-02 | [
[
"Gutsche",
"Thomas",
""
],
[
"Lyubovitskij",
"Valery E.",
""
],
[
"Schmidt",
"Ivan",
""
],
[
"Trifonov",
"Andrey Yu.",
""
]
] | We derive a holographic soft-wall approach in five dimensional AdS-Schwarzschild space for the description of mesons at finite temperature. In this first application we consider the small temperature limit and derive analytical expression for the mass spectrum of mesons with adjustable quantum numbers $n$ (radial number), $L$ (angular orbital momentum) and $J$ (total angular momentum). We explicitly separate the contribution at zero temperature and the leading order temperature correction. The temperature corrections arise from the temperature dependence of the dilaton parameter (which is the parameter of spontaneous breaking of chiral symmetry related to the pseudoscalar meson decay constant) and the warping of the AdS metric due to temperature. We extend our results to any hadron with integer spin (tetraquarks, dibaryons, etc.). We present numerical analysis for the temperature dependence of meson masses and form factors. |
hep-ph/0011216 | Junji Hisano | J. Hisano, K. Kohri and M.M. Nojiri | Neutralino Warm Dark Matter | 13 pages. Some references are added in revised version | Phys.Lett. B505 (2001) 169-176 | 10.1016/S0370-2693(01)00395-1 | null | hep-ph astro-ph | null | In the supersymmetric (SUSY) standard model, the lightest neutralino may be
the lightest SUSY particle (LSP), and it is is a candidate of the dark matter
in the universe. The LSP dark matter might be produced by the non-thermal
process such as heavy particle decay after decoupling of the thermal relic LSP.
If the produced LSP is relativistic, and does not scatter enough in the thermal
bath, the neutralino LSP may contribute as the warm dark matter (WDM) to wash
out the small scale structure of O(0.1) Mpc. In this letter we calculate the
energy reduction of the neutralino LSP in the thermal bath and study whether
the LSP can be the WDM. If temperature of the production time T_I is smaller
than 5MeV, the bino-like LSP can be the WDM and may contribute to the
small-scale structure of O(0.1) Mpc. The Higgsino-like LSP might also work as
the WDM if T_I< 2MeV. The wino-like LSP cannot be the WDM in the favoured
parameter region.
| [
{
"created": "Fri, 17 Nov 2000 14:58:02 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Nov 2000 10:30:02 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Hisano",
"J.",
""
],
[
"Kohri",
"K.",
""
],
[
"Nojiri",
"M. M.",
""
]
] | In the supersymmetric (SUSY) standard model, the lightest neutralino may be the lightest SUSY particle (LSP), and it is is a candidate of the dark matter in the universe. The LSP dark matter might be produced by the non-thermal process such as heavy particle decay after decoupling of the thermal relic LSP. If the produced LSP is relativistic, and does not scatter enough in the thermal bath, the neutralino LSP may contribute as the warm dark matter (WDM) to wash out the small scale structure of O(0.1) Mpc. In this letter we calculate the energy reduction of the neutralino LSP in the thermal bath and study whether the LSP can be the WDM. If temperature of the production time T_I is smaller than 5MeV, the bino-like LSP can be the WDM and may contribute to the small-scale structure of O(0.1) Mpc. The Higgsino-like LSP might also work as the WDM if T_I< 2MeV. The wino-like LSP cannot be the WDM in the favoured parameter region. |
2103.17064 | Bastian Diaz | Basti\'an D\'iaz S\'aez, Kilian M\"ohling, Dominik St\"ockinger | Two Real Scalar WIMP Model in the Assisted Freeze-Out Scenario | null | null | 10.1088/1475-7516/2021/10/027 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We study a simple dark matter model given by two interacting real singlet
scalars, with only one of them coupled to the Higgs. The model therefore
presents a minimal assisted-freeze-out framework: both scalars contribute to
the dark matter relic density, but only one of them takes part in the elastic
scattering with nuclei. This reduces the expected interaction rate in direct
detection experiments in such a way that the model in some regions of the
parameter space may evade XENON1T constraints. We explore the model under
theoretical (perturbativity, stability potential and unitarity) and
experimental constraints (Higgs to invisible, relic density, direct detection),
with the use of the narrow-width-approximation near the Higgs resonance to
calculate the average annihilation cross section. We show that the model is
viable in the Higgs resonance region and for scalar singlets masses of hundreds
of GeV, although the model becomes highly constrained at high energies.
| [
{
"created": "Wed, 31 Mar 2021 13:31:15 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Aug 2021 14:18:52 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Oct 2021 19:04:06 GMT",
"version": "v3"
}
] | 2021-10-20 | [
[
"Sáez",
"Bastián Díaz",
""
],
[
"Möhling",
"Kilian",
""
],
[
"Stöckinger",
"Dominik",
""
]
] | We study a simple dark matter model given by two interacting real singlet scalars, with only one of them coupled to the Higgs. The model therefore presents a minimal assisted-freeze-out framework: both scalars contribute to the dark matter relic density, but only one of them takes part in the elastic scattering with nuclei. This reduces the expected interaction rate in direct detection experiments in such a way that the model in some regions of the parameter space may evade XENON1T constraints. We explore the model under theoretical (perturbativity, stability potential and unitarity) and experimental constraints (Higgs to invisible, relic density, direct detection), with the use of the narrow-width-approximation near the Higgs resonance to calculate the average annihilation cross section. We show that the model is viable in the Higgs resonance region and for scalar singlets masses of hundreds of GeV, although the model becomes highly constrained at high energies. |
2201.01721 | Richard F. Lebed | Richard F. Lebed | All Heavy Tetraquarks: The Dynamical Diquark Model and Other Approaches | 7 pages, 1 figure. Invited talk at the 20th Lomonosov Conference on
Elementary Particle Physics, 19-25 Aug. 2021 | null | 10.3103/S002713492202059X | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The 2020 announcement by LHCb of a narrow structure $X(6900)$ in the
di-$J/\psi$ spectrum -- a potential $c\bar c c\bar c$ state -- has opened a new
era in hadronic spectroscopy. In this talk, we briefly survey theory works
preceding this event, examine key features of the observed spectrum, and then
discuss how subsequent theory studies (including with the author's own
dynamical diquark model) have interpreted these features. We conclude with
proposals for experiments capable of distinguishing competing interpretations.
| [
{
"created": "Wed, 5 Jan 2022 17:23:27 GMT",
"version": "v1"
}
] | 2022-09-21 | [
[
"Lebed",
"Richard F.",
""
]
] | The 2020 announcement by LHCb of a narrow structure $X(6900)$ in the di-$J/\psi$ spectrum -- a potential $c\bar c c\bar c$ state -- has opened a new era in hadronic spectroscopy. In this talk, we briefly survey theory works preceding this event, examine key features of the observed spectrum, and then discuss how subsequent theory studies (including with the author's own dynamical diquark model) have interpreted these features. We conclude with proposals for experiments capable of distinguishing competing interpretations. |
2212.02838 | Guo-Li Wang | Su-Yan Pei, Wei Li, Ting-Ting Liu, Meng Han, Guo-Li Wang, Tianhong
Wang | Partial wave effects in the heavy quarkonium radiative electromagnetic
decays | 31 pages, 19 tables | Physical Review D 108, 033003 (2023) | 10.1103/PhysRevD.108.033003 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a previous paper \cite{Bc}, it was pointed out that the wave functions of
all particles are not pure waves, besides the main partial waves, they all
contain {other partial waves}. It is very interesting to know what role these
different partial waves play in particle transitions. Therefore, by using the
Bethe-Salpeter equation method, we study the radiative electromagnetic decays
$\psi\rightarrow\gamma\chi_{_{cJ}}$ and $\Upsilon\rightarrow\gamma\chi_{_{bJ}}$
($J=0,1,2$). We find that for the $S$ and $P$ wave dominated states, like the
$\psi(2S)$, $\Upsilon(2S)$, $\chi_{_{cJ}}(1P)$, and $\chi_{_{bJ}}(1P)$ etc.,
the dominant $S$ and $P$ waves provide main and nonrelativistic contrition to
the decays; other partial waves mainly contribute to the relativistic
correction. For the states like the $\psi(1D)$, $\Upsilon(2D)$,
$\chi_{c2}(1F)$, and $\chi_{b2}(1F)$ etc., they are the $S-P-D$ mixing state
dominated by $D$ wave or the $P-D-F$ mixing state dominated by $F$ wave. Large
decay widths are found in the transitions $\psi(2D)\to \chi_{c2}(1F)$,
$\Upsilon(1D)\to \chi_{bJ}(1P)$, and $\Upsilon(2D)\to \chi_{bJ}(2P)$ etc.,
which may be helpful to study the missing states $\chi_{c2}(1F)$,
$\Upsilon(1D)$, and $\Upsilon(2D)$.
| [
{
"created": "Tue, 6 Dec 2022 09:20:05 GMT",
"version": "v1"
},
{
"created": "Sat, 19 Aug 2023 06:54:23 GMT",
"version": "v2"
}
] | 2023-08-22 | [
[
"Pei",
"Su-Yan",
""
],
[
"Li",
"Wei",
""
],
[
"Liu",
"Ting-Ting",
""
],
[
"Han",
"Meng",
""
],
[
"Wang",
"Guo-Li",
""
],
[
"Wang",
"Tianhong",
""
]
] | In a previous paper \cite{Bc}, it was pointed out that the wave functions of all particles are not pure waves, besides the main partial waves, they all contain {other partial waves}. It is very interesting to know what role these different partial waves play in particle transitions. Therefore, by using the Bethe-Salpeter equation method, we study the radiative electromagnetic decays $\psi\rightarrow\gamma\chi_{_{cJ}}$ and $\Upsilon\rightarrow\gamma\chi_{_{bJ}}$ ($J=0,1,2$). We find that for the $S$ and $P$ wave dominated states, like the $\psi(2S)$, $\Upsilon(2S)$, $\chi_{_{cJ}}(1P)$, and $\chi_{_{bJ}}(1P)$ etc., the dominant $S$ and $P$ waves provide main and nonrelativistic contrition to the decays; other partial waves mainly contribute to the relativistic correction. For the states like the $\psi(1D)$, $\Upsilon(2D)$, $\chi_{c2}(1F)$, and $\chi_{b2}(1F)$ etc., they are the $S-P-D$ mixing state dominated by $D$ wave or the $P-D-F$ mixing state dominated by $F$ wave. Large decay widths are found in the transitions $\psi(2D)\to \chi_{c2}(1F)$, $\Upsilon(1D)\to \chi_{bJ}(1P)$, and $\Upsilon(2D)\to \chi_{bJ}(2P)$ etc., which may be helpful to study the missing states $\chi_{c2}(1F)$, $\Upsilon(1D)$, and $\Upsilon(2D)$. |
hep-ph/9610297 | Pietro Santorelli | P. Colangelo, F. De Fazio, P. Santorelli, E. Scrimieri | Rare B \to K^{(*)} \nu\bar\nu Decays at B Factories | 11 pages LaTeX + 2 eps figures. Version published in Physics Letters
B | Phys.Lett. B395 (1997) 339-344 | 10.1016/S0370-2693(97)00130-5 | BARI-TH/96-252, Napoli Preprint DSF-T-46/96 | hep-ph | null | We compute the branching fraction of the decays $B \to K \nu \bar\nu$ and $B
\to K^* \nu \bar\nu$ in the Standard Model. We also comment on the experimental
difficulties and procedures to detect such modes at B factories.
| [
{
"created": "Wed, 9 Oct 1996 11:53:03 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Apr 1997 18:05:45 GMT",
"version": "v2"
}
] | 2016-09-06 | [
[
"Colangelo",
"P.",
""
],
[
"De Fazio",
"F.",
""
],
[
"Santorelli",
"P.",
""
],
[
"Scrimieri",
"E.",
""
]
] | We compute the branching fraction of the decays $B \to K \nu \bar\nu$ and $B \to K^* \nu \bar\nu$ in the Standard Model. We also comment on the experimental difficulties and procedures to detect such modes at B factories. |
1003.1620 | Florian Bernlochner | Florian Urs Bernlochner and Heiko Lacker | A phenomenological model for radiative corrections in exclusive
semileptonic B-meson decays to (pseudo)scalar final state mesons | 52 pages, 13 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Next-to-leading order corrections are an important aspect in the extraction
of the Cabibbo- Kobayashi-Maskawa matrix elements $|V_{\text{cb}}|$ and
$|V_{\text{ub}}|$ at $B$-factory experiments: virtual and real photons couple
to all charged particles of the decay, alter the resulting decay dynamics and
enhance the total decay rate. We present a phenomenologically motivated model
and a Monte-Carlo implementation to study electromagnetic radiative corrections
to differential and total decay rates for semileptonic $B$-meson decays into
exclusive pseudoscalar and scalar final states and apply it to $B \to D \, l \,
\nu$ and $B \to \pi \, l \, \nu$, and $B \to D_0^* \, l \, \nu$ decays,
respectively. We study such corrections with a phenomenological picture of
point-like mesons (with some structure-dependent corrections), which is valid
in the low-energy region of the photons and whose results we extrapolate over
the complete phase space. The largest quantifiable uncertainty is due to the
approximative matching to the Standard Model. In addition unknown
structure-dependent contributions and model dependencies might have an impact
on our findings.
| [
{
"created": "Mon, 8 Mar 2010 13:28:13 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Mar 2010 20:52:31 GMT",
"version": "v2"
},
{
"created": "Mon, 24 May 2010 16:29:24 GMT",
"version": "v3"
},
{
"created": "Thu, 28 Oct 2010 15:47:36 GMT",
"version": "v4"
}
] | 2010-10-29 | [
[
"Bernlochner",
"Florian Urs",
""
],
[
"Lacker",
"Heiko",
""
]
] | Next-to-leading order corrections are an important aspect in the extraction of the Cabibbo- Kobayashi-Maskawa matrix elements $|V_{\text{cb}}|$ and $|V_{\text{ub}}|$ at $B$-factory experiments: virtual and real photons couple to all charged particles of the decay, alter the resulting decay dynamics and enhance the total decay rate. We present a phenomenologically motivated model and a Monte-Carlo implementation to study electromagnetic radiative corrections to differential and total decay rates for semileptonic $B$-meson decays into exclusive pseudoscalar and scalar final states and apply it to $B \to D \, l \, \nu$ and $B \to \pi \, l \, \nu$, and $B \to D_0^* \, l \, \nu$ decays, respectively. We study such corrections with a phenomenological picture of point-like mesons (with some structure-dependent corrections), which is valid in the low-energy region of the photons and whose results we extrapolate over the complete phase space. The largest quantifiable uncertainty is due to the approximative matching to the Standard Model. In addition unknown structure-dependent contributions and model dependencies might have an impact on our findings. |
2112.08374 | Clara Murgui | Clara Murgui and Kathryn M. Zurek | Dark Unification: a UV-complete Theory of Asymmetric Dark Matter | 33 pages, 6 figures | null | 10.1103/PhysRevD.105.095002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the observed ratio of dark matter to baryon mass densities,
$\rho_D/\rho_B \simeq 5$, we propose a theory of dark-color unification. In
this theory, the dark to visible baryon masses are fixed by the ratio of dark
to visible confinement scales, which are determined to be nearby in mass
through the unification of the dark and visible gauge theories at a high scale.
Together with a mechanism for darko-baryo-genesis, which arises naturally from
the grand unification sector, the mass densities of the two sectors must be
nearby, explaining the observed mass density of dark matter. We focus on the
simplest possible example of such a theory, where Standard Model color
$SU(3)_C$ is unified with dark color $SU(2)_D$ into $SU(5)$ at an intermediate
scale of around $10^8-10^9$ GeV. The dark baryon consists of two dark quarks in
an isotriplet configuration. There are a range of important cosmological,
astrophysical and collider signatures to explore, including dark matter
self-interactions, early matter domination from the dark hadrons, gravitational
wave signatures from the hidden sector phase transition, contributions to
flavor observables, as well as Hidden Valley-like signatures at colliders.
| [
{
"created": "Wed, 15 Dec 2021 19:00:00 GMT",
"version": "v1"
}
] | 2022-05-18 | [
[
"Murgui",
"Clara",
""
],
[
"Zurek",
"Kathryn M.",
""
]
] | Motivated by the observed ratio of dark matter to baryon mass densities, $\rho_D/\rho_B \simeq 5$, we propose a theory of dark-color unification. In this theory, the dark to visible baryon masses are fixed by the ratio of dark to visible confinement scales, which are determined to be nearby in mass through the unification of the dark and visible gauge theories at a high scale. Together with a mechanism for darko-baryo-genesis, which arises naturally from the grand unification sector, the mass densities of the two sectors must be nearby, explaining the observed mass density of dark matter. We focus on the simplest possible example of such a theory, where Standard Model color $SU(3)_C$ is unified with dark color $SU(2)_D$ into $SU(5)$ at an intermediate scale of around $10^8-10^9$ GeV. The dark baryon consists of two dark quarks in an isotriplet configuration. There are a range of important cosmological, astrophysical and collider signatures to explore, including dark matter self-interactions, early matter domination from the dark hadrons, gravitational wave signatures from the hidden sector phase transition, contributions to flavor observables, as well as Hidden Valley-like signatures at colliders. |
hep-ph/0312227 | Edward Shuryak | Edward Shuryak | Why does the Quark-Gluon Plasma at RHIC behave as a nearly ideal fluid ? | 25 pages, lectures in Erice School on Nulcear Physics, Sept.2003.
Version 2 corrects several typos and adds a couple of references | Prog.Part.Nucl.Phys. 53 (2004) 273-303 | 10.1016/j.ppnp.2004.02.025 | null | hep-ph nucl-th | null | The lecture is a brief review of the following topics: (i) collective flow
phenomena in heavy ion collisions. The data from RHIC indicate robust
collective flows, well described by hydrodynamics with expected Equation of
State. The transport properties turned out to be unexpected, with very small
viscosity;
(ii) physics of highly excited matter produced in heavy ion collisions at
T_c<T<4T_c is different from weakly coupled quark-gluon plasma because of
relatively strong coupling generating bound states of quasiparticles;
(iii) wider discussion of other ``strongly coupled systems'' including
strongly coupled supersymmetric theories studied via Maldacena duality, as well
as recent progress in trapped atoms with very large scattering length.
| [
{
"created": "Tue, 16 Dec 2003 22:30:12 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Dec 2003 18:16:09 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Shuryak",
"Edward",
""
]
] | The lecture is a brief review of the following topics: (i) collective flow phenomena in heavy ion collisions. The data from RHIC indicate robust collective flows, well described by hydrodynamics with expected Equation of State. The transport properties turned out to be unexpected, with very small viscosity; (ii) physics of highly excited matter produced in heavy ion collisions at T_c<T<4T_c is different from weakly coupled quark-gluon plasma because of relatively strong coupling generating bound states of quasiparticles; (iii) wider discussion of other ``strongly coupled systems'' including strongly coupled supersymmetric theories studied via Maldacena duality, as well as recent progress in trapped atoms with very large scattering length. |
hep-ph/9709444 | Paul Hoyer | Paul Hoyer (Nordita) | A Perturbative Gluon Condensate | 14 pages, no figures. Talk presented at the `APCTP-ICTP Joint
International Conference 1997 (AIJIC 97) on Recent Developments in
Non-perturbative Methods', May 26 - 30, 1997 in Seoul, Korea | null | null | NORDITA--97/44 P | hep-ph | null | There is considerable freedom in setting boundary conditions to perturbation
theory at $t=\pm\infty$. The standard PQED and PQCD expansions are based on the
(empty) perturbative vacuum. Since the true QCD ground state is expected to
have a condensate of low momentum gluons, I propose studying expansions around
states containing free particles. A specific boundary condition (the
`Perturbative Gluon Condensate'), which implies a freezing of low momentum
gluons, could be a candidate for describing confinement physics. The modified
perturbative series has a number of new features, although it is formally
equivalent to the standard one and a priori equally justified.
| [
{
"created": "Wed, 24 Sep 1997 14:44:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hoyer",
"Paul",
"",
"Nordita"
]
] | There is considerable freedom in setting boundary conditions to perturbation theory at $t=\pm\infty$. The standard PQED and PQCD expansions are based on the (empty) perturbative vacuum. Since the true QCD ground state is expected to have a condensate of low momentum gluons, I propose studying expansions around states containing free particles. A specific boundary condition (the `Perturbative Gluon Condensate'), which implies a freezing of low momentum gluons, could be a candidate for describing confinement physics. The modified perturbative series has a number of new features, although it is formally equivalent to the standard one and a priori equally justified. |
hep-ph/0109196 | V. Gogohia | V. Gogohia | How to explicitly introduce the Jaffe-Witten mass gap into the quantum
Yang-Mills theory | Talk given at Sixth Workshop on Non-Perturbative Quantum
Chromodynamics, 5-9 June 2001, Paris, France | null | 10.1142/9789812778352_0040 | null | hep-ph hep-th | null | We propose how to explicitly introduce the Jaffe-Witten mass gap into the
quantum Yang-Mills theory. Through the full gluon propagator it is defined as
such nonperturbative scale that when it formally goes to zero, then the
perturbative phase survives in the theory only. The close link between mass gap
and strong infrared singularities which are due to dominated in the QCD vacuum
self-interaction of massless gluons is also discussed. This interaction leads
thus to the zero momentum modes enhancement effect in the QCD nonperturbative
vacuum. Using theory of distributions, we argue that strong nonperturbative
infrared singularities can be put under control. A new, intrinsically
nonperturbative phase in QCD is established.
| [
{
"created": "Fri, 21 Sep 2001 13:36:35 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Gogohia",
"V.",
""
]
] | We propose how to explicitly introduce the Jaffe-Witten mass gap into the quantum Yang-Mills theory. Through the full gluon propagator it is defined as such nonperturbative scale that when it formally goes to zero, then the perturbative phase survives in the theory only. The close link between mass gap and strong infrared singularities which are due to dominated in the QCD vacuum self-interaction of massless gluons is also discussed. This interaction leads thus to the zero momentum modes enhancement effect in the QCD nonperturbative vacuum. Using theory of distributions, we argue that strong nonperturbative infrared singularities can be put under control. A new, intrinsically nonperturbative phase in QCD is established. |
2207.05425 | Junegone Chay | Junegone Chay and Taehyun Kwon | N-jettiness for muon jet pairs in electroweak high-energy processes | 41 pages, 7 figures | null | 10.1007/JHEP12(2022)091 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We study the $N$-jettiness in the electroweak high-energy process for the
final muon jet pairs, $e^- e^+ \rightarrow \mu^+ \ \mathrm{jet} + \mu^-
\mathrm{jet}$. Compared to QCD, the main difference is that there exist
additional gauge nonsinglet contributions in the weak interaction, which make
the factorization more elaborate. Especially the nonsinglet contributions arise
due to the Block-Nordsieck violation in electroweak processes, which yields the
Sudakov logarithms and the rapidity divergence. They change the evolution of
the factorized parts considerably in the $N$-jettiness. There are two possible
channels, initiated from the gauge bosons $W W \rightarrow \ell_{\mu}
\overline{\ell}_{\mu}$, and from the electrons $\ell_e \overline{\ell}_e
\rightarrow \ell_{\mu} \overline{\ell}_{\mu}$, where $\ell$ denotes the weak
doublet. The latter was discussed previously, and we complete the analysis by
studying the first. The factorization for $W W \rightarrow \ell_{\mu}
\overline{\ell}_{\mu}$ can be proceeded in a similar way as in the
factorization for $\ell_e\overline{\ell}_e \rightarrow \ell_{\mu}
\overline{\ell}_{\mu}$, and the result exhibits a rich structure. The new
ingredients in this study consist of the $W$ beam functions, and the complex
color structure of the soft functions and the hard functions. The resummation
of the large logarithms is performed by solving the renormalization group
equations with respect to the renormalization scale and the rapidity scale. In
the numerical analysis, we confine to the SU(2) weak gauge interaction, and the
numerical results are presented for both channels at
next-to-leading-logarithmic accuracy including the singlet and the nonsinglet
contributions. The nonsinglet contributions turn out to be appreciable in the
2-jettiness.
| [
{
"created": "Tue, 12 Jul 2022 09:38:56 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Dec 2022 03:03:39 GMT",
"version": "v2"
}
] | 2023-01-04 | [
[
"Chay",
"Junegone",
""
],
[
"Kwon",
"Taehyun",
""
]
] | We study the $N$-jettiness in the electroweak high-energy process for the final muon jet pairs, $e^- e^+ \rightarrow \mu^+ \ \mathrm{jet} + \mu^- \mathrm{jet}$. Compared to QCD, the main difference is that there exist additional gauge nonsinglet contributions in the weak interaction, which make the factorization more elaborate. Especially the nonsinglet contributions arise due to the Block-Nordsieck violation in electroweak processes, which yields the Sudakov logarithms and the rapidity divergence. They change the evolution of the factorized parts considerably in the $N$-jettiness. There are two possible channels, initiated from the gauge bosons $W W \rightarrow \ell_{\mu} \overline{\ell}_{\mu}$, and from the electrons $\ell_e \overline{\ell}_e \rightarrow \ell_{\mu} \overline{\ell}_{\mu}$, where $\ell$ denotes the weak doublet. The latter was discussed previously, and we complete the analysis by studying the first. The factorization for $W W \rightarrow \ell_{\mu} \overline{\ell}_{\mu}$ can be proceeded in a similar way as in the factorization for $\ell_e\overline{\ell}_e \rightarrow \ell_{\mu} \overline{\ell}_{\mu}$, and the result exhibits a rich structure. The new ingredients in this study consist of the $W$ beam functions, and the complex color structure of the soft functions and the hard functions. The resummation of the large logarithms is performed by solving the renormalization group equations with respect to the renormalization scale and the rapidity scale. In the numerical analysis, we confine to the SU(2) weak gauge interaction, and the numerical results are presented for both channels at next-to-leading-logarithmic accuracy including the singlet and the nonsinglet contributions. The nonsinglet contributions turn out to be appreciable in the 2-jettiness. |
hep-ph/9610474 | null | Luis Gonzalez-Mestres (LPC College de France and LAPP Annecy) | Physical and Cosmological Implications of a Possible Class of Particles
Able to Travel Faster than Light | 14 pages, contribution to the 28th International Conference on High
Energy Physics, Warsaw (Poland) July 1996 | null | null | null | hep-ph astro-ph gr-qc hep-th physics.gen-ph | null | If Lorentz invariance is only an approximate property of equations describing
a sector of matter above some critical distance scale, the speed of light c
will not necessarily be the only critical speed in vacuum. Superluminal sectors
of matter may exist related to new degrees of freedom not yet discovered
experimentally. The new particles would not be tachyons: they may feel
different minkowskian space-times with critical speeds much higher than c and
behave kinematically like ordinary particles apart from the difference in
critical speed. We present a discussion of possible physical (theoretical and
experimental) and cosmological implications of such a scenario, assuming that
the superluminal sectors couple weakly to ordinary matter.
| [
{
"created": "Thu, 24 Oct 1996 22:41:51 GMT",
"version": "v1"
}
] | 2008-02-03 | [
[
"Gonzalez-Mestres",
"Luis",
"",
"LPC College de France and LAPP Annecy"
]
] | If Lorentz invariance is only an approximate property of equations describing a sector of matter above some critical distance scale, the speed of light c will not necessarily be the only critical speed in vacuum. Superluminal sectors of matter may exist related to new degrees of freedom not yet discovered experimentally. The new particles would not be tachyons: they may feel different minkowskian space-times with critical speeds much higher than c and behave kinematically like ordinary particles apart from the difference in critical speed. We present a discussion of possible physical (theoretical and experimental) and cosmological implications of such a scenario, assuming that the superluminal sectors couple weakly to ordinary matter. |
1210.8107 | Sener Ozonder | Sener Ozonder | Determination of the Parameters of a Color Neutral 3D Color Glass
Condensate Model | 17 pages, 2 figures. Summary expanded. Typos in Eqs. (15) and (20)
corrected. Published version | Phys.Rev.D87:045013,2013 | 10.1103/PhysRevD.87.045013 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a version of the McLerran-Venugopalan model by Lam and Mahlon
where confinement is implemented via colored noise in the infrared. This model
does not assume an infinite momentum frame, hence the boosted nuclei are not
infinitely thin. Instead, the nuclei have a finite extension in the
longitudinal direction and therefore depend on the longitudinal coordinate. In
this fully three dimensional framework an x dependence of the gluon
distribution function emerges naturally. In order to fix the parameters of the
model, we calculate the gluon distribution function and compare it with the
JR09 parametrization of the data. We explore the parameter space of the model
to attain a working framework that can be used to calculate the initial
conditions in heavy ion collisions.
| [
{
"created": "Tue, 30 Oct 2012 18:19:51 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Feb 2013 23:55:02 GMT",
"version": "v2"
}
] | 2013-02-27 | [
[
"Ozonder",
"Sener",
""
]
] | We consider a version of the McLerran-Venugopalan model by Lam and Mahlon where confinement is implemented via colored noise in the infrared. This model does not assume an infinite momentum frame, hence the boosted nuclei are not infinitely thin. Instead, the nuclei have a finite extension in the longitudinal direction and therefore depend on the longitudinal coordinate. In this fully three dimensional framework an x dependence of the gluon distribution function emerges naturally. In order to fix the parameters of the model, we calculate the gluon distribution function and compare it with the JR09 parametrization of the data. We explore the parameter space of the model to attain a working framework that can be used to calculate the initial conditions in heavy ion collisions. |
1305.6406 | Alan D. Martin | E.G. de Oliveira, A.D. Martin and M.G. Ryskin | Treatment of the infrared contribution: NLO QED evolution as a pedagogic
example | 15 pages, 2 figures, erratum at the end of the article | Eur. Phys. J. C (2013) 73:2534 | 10.1140/epjc/s10052-013-2534-3 | IPPP/13/32, DCPT/13/64 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the conventional prescription used for DGLAP parton evolution at
NLO has an inconsistent treatment of the contribution from the infrared (IR)
region. We illustrate the problem by studying the simple example of QED
evolution, treating the electron and photon as partons. The deficiency is not
present in a physical approach which removes the IR divergency and allows
calculation in the normal 4-dimensional space.
| [
{
"created": "Tue, 28 May 2013 08:29:06 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Oct 2013 09:57:36 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"de Oliveira",
"E. G.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Ryskin",
"M. G.",
""
]
] | We show that the conventional prescription used for DGLAP parton evolution at NLO has an inconsistent treatment of the contribution from the infrared (IR) region. We illustrate the problem by studying the simple example of QED evolution, treating the electron and photon as partons. The deficiency is not present in a physical approach which removes the IR divergency and allows calculation in the normal 4-dimensional space. |
hep-ph/0405302 | Sally Dawson | J. Campbell, S. Dawson, S. Dittmaier, C. Jackson, M. Kramer, F.
Maltoni, L. Reina, M. Spira, D. Wackeroth, S. Willenbrock | Higgs Boson Production in Association with Bottom Quarks | 7 pages, Contributed to 3rd Les Houches Workshop: Physics at TeV
Colliders | null | null | null | hep-ph | null | In the Standard Model, the coupling of the Higgs boson to b quarks is weak,
leading to small cross sections for producing a Higgs boson in association with
b quarks. However, Higgs bosons with enhanced couplings to b quarks, such as
occur in supersymmetric models for large values of tan beta, will be copiously
produced at both the Tevatron and the LHC in association with b quarks, which
will be an important discovery channel. We investigate the connections between
the production channels, bg -> bh and gg ->b bbar h, at next-to-leading order
(NLO) in perturbative QCD and present results for the cases with two high p_T b
jets and with one high p_T b jet at both the Tevatron the the LHC. Finally, the
total cross sections without cuts are compared between gg -> b bbar h at NLO
and b bbar ->h at NNLO.
| [
{
"created": "Mon, 31 May 2004 15:03:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Campbell",
"J.",
""
],
[
"Dawson",
"S.",
""
],
[
"Dittmaier",
"S.",
""
],
[
"Jackson",
"C.",
""
],
[
"Kramer",
"M.",
""
],
[
"Maltoni",
"F.",
""
],
[
"Reina",
"L.",
""
],
[
"Spira",
"M.",
"... | In the Standard Model, the coupling of the Higgs boson to b quarks is weak, leading to small cross sections for producing a Higgs boson in association with b quarks. However, Higgs bosons with enhanced couplings to b quarks, such as occur in supersymmetric models for large values of tan beta, will be copiously produced at both the Tevatron and the LHC in association with b quarks, which will be an important discovery channel. We investigate the connections between the production channels, bg -> bh and gg ->b bbar h, at next-to-leading order (NLO) in perturbative QCD and present results for the cases with two high p_T b jets and with one high p_T b jet at both the Tevatron the the LHC. Finally, the total cross sections without cuts are compared between gg -> b bbar h at NLO and b bbar ->h at NNLO. |
1104.1631 | Prerit Jaiswal | S. Dawson, C. B. Jackson, P. Jaiswal | SUSY QCD Corrections to Higgs-b Production : Is the \Delta_b
Approximation Accurate? | figures added, version to be published in Phys Rev D | Phys.Rev.D83:115007,2011 | 10.1103/PhysRevD.83.115007 | YITP-SB-11-11 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The associated production of a Higgs boson with a b quark is a discovery
channel for the lightest MSSM neutral Higgs boson. We consider the SUSY QCD
contributions from squarks and gluinos and discuss the decoupling properties of
these effects. A detailed comparison of our exact order(alpha_s) results with
those of a widely used effective Lagrangian approach, the \Delta_b
approximation, is presented. The \Delta_b approximation is shown to accurately
reproduce the exact one-loop SQCD result to within a few percent over a wide
range of parameter space.
| [
{
"created": "Fri, 8 Apr 2011 19:56:40 GMT",
"version": "v1"
},
{
"created": "Thu, 19 May 2011 20:16:14 GMT",
"version": "v2"
}
] | 2015-03-19 | [
[
"Dawson",
"S.",
""
],
[
"Jackson",
"C. B.",
""
],
[
"Jaiswal",
"P.",
""
]
] | The associated production of a Higgs boson with a b quark is a discovery channel for the lightest MSSM neutral Higgs boson. We consider the SUSY QCD contributions from squarks and gluinos and discuss the decoupling properties of these effects. A detailed comparison of our exact order(alpha_s) results with those of a widely used effective Lagrangian approach, the \Delta_b approximation, is presented. The \Delta_b approximation is shown to accurately reproduce the exact one-loop SQCD result to within a few percent over a wide range of parameter space. |
hep-ph/0106272 | H. Casini | Horacio Casini and Subir Sarkar (Oxford) | No cosmological domain wall problem for weakly coupled fields | 17 pages, 4 figures (Revtex), clarifying Comments added in
Introduction; to appear in Phys. Rev D | Phys.Rev.D65:025002,2002 | 10.1103/PhysRevD.65.025002 | OUTP-01-28P | hep-ph astro-ph | null | After inflation occurs, a weakly coupled scalar field will in general not be
in thermal equilibrium but have a distribution of values determined by the
inflationary Hubble parameter. If such a field subsequently undergoes discrete
symmetry breaking, then the different degenerate vacua may not be equally
populated so the domain walls which form will be `biased' and the wall network
will subsequently collapse. Thus the cosmological domain wall problem may be
solved for sufficiently weakly coupled fields in a post-inflationary universe.
We quantify the criteria for determining whether this does happen, using a
Higgs-like potential with a spontaneously broken $Z_2$ symmetry.
| [
{
"created": "Mon, 25 Jun 2001 10:04:41 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Oct 2001 10:35:41 GMT",
"version": "v2"
}
] | 2011-02-16 | [
[
"Casini",
"Horacio",
"",
"Oxford"
],
[
"Sarkar",
"Subir",
"",
"Oxford"
]
] | After inflation occurs, a weakly coupled scalar field will in general not be in thermal equilibrium but have a distribution of values determined by the inflationary Hubble parameter. If such a field subsequently undergoes discrete symmetry breaking, then the different degenerate vacua may not be equally populated so the domain walls which form will be `biased' and the wall network will subsequently collapse. Thus the cosmological domain wall problem may be solved for sufficiently weakly coupled fields in a post-inflationary universe. We quantify the criteria for determining whether this does happen, using a Higgs-like potential with a spontaneously broken $Z_2$ symmetry. |
hep-ph/0202021 | Joanne Gillett | V.A. Khoze, M.I. Konchatnij, N.P. Merenkov, G. Pancheri, L. Trentadue,
O.N. Shekhovtzova | Scanning of the e+e- to pi+pi- cross--section below 1 GeV by radiative
events with untagged photon | 25 pages, 4 figures, latex | Eur.Phys.J.C25:199-213,2002 | 10.1007/s10052-002-0963-5 | null | hep-ph | null | We discuss an inclusive approach to the measurement of the e+e- --> pi+ pi-
cross--section by the radiative return method without photon tagging. The
essential part of this approach is the choice of rules for event selection
which provide rejection of events with 3 (or more) pions and decrease the
final--state radiation background. The radiative corrections to the
initial--state radiation process are computed for DAPhNE conditions, using the
quasi--real electron approximation for both, the cross--section and the
underlying kinematics. The two cases of restricted and unrestricted pion phase
space are considered. Some numerical calculations illustrate our analytical
results.
| [
{
"created": "Mon, 4 Feb 2002 12:48:21 GMT",
"version": "v1"
}
] | 2009-01-07 | [
[
"Khoze",
"V. A.",
""
],
[
"Konchatnij",
"M. I.",
""
],
[
"Merenkov",
"N. P.",
""
],
[
"Pancheri",
"G.",
""
],
[
"Trentadue",
"L.",
""
],
[
"Shekhovtzova",
"O. N.",
""
]
] | We discuss an inclusive approach to the measurement of the e+e- --> pi+ pi- cross--section by the radiative return method without photon tagging. The essential part of this approach is the choice of rules for event selection which provide rejection of events with 3 (or more) pions and decrease the final--state radiation background. The radiative corrections to the initial--state radiation process are computed for DAPhNE conditions, using the quasi--real electron approximation for both, the cross--section and the underlying kinematics. The two cases of restricted and unrestricted pion phase space are considered. Some numerical calculations illustrate our analytical results. |
hep-ph/9810247 | Utpal Sarkar | Utpal Sarkar | Baryogenesis through lepton number violation | 12 pages latex file with iopconf.sty and three postscript figures (to
appear in Second Int Conf on Dark Matter in Astro and Particle Physics, July
20-25, Heidelberg, Germany, 1998) | null | null | null | hep-ph | null | The most promising scenarios of baryogenesis seems to be the one through
lepton number violation. Lepton number violation through a Majarana mass of the
right-handed neutrinos can generate a lepton asymmetry of the universe when the
right-handed neutrinos decay. The left-handed neutrinos get small Majorana
masses through see-saw mechanism in these models. A triplet higgs scalar
violating lepton number explicitly through its couplings to two leptons or two
higgs doublets can also naturally give small Majorana masses to the left-handed
neutrinos and also generate a lepton asymmetry of the universe. We review both
these models of leptogenesis, where the lepton number asymmetry then gets
converted to a baryon asymmetry of the universe before the electroweak phase
transition.
| [
{
"created": "Mon, 5 Oct 1998 12:48:01 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sarkar",
"Utpal",
""
]
] | The most promising scenarios of baryogenesis seems to be the one through lepton number violation. Lepton number violation through a Majarana mass of the right-handed neutrinos can generate a lepton asymmetry of the universe when the right-handed neutrinos decay. The left-handed neutrinos get small Majorana masses through see-saw mechanism in these models. A triplet higgs scalar violating lepton number explicitly through its couplings to two leptons or two higgs doublets can also naturally give small Majorana masses to the left-handed neutrinos and also generate a lepton asymmetry of the universe. We review both these models of leptogenesis, where the lepton number asymmetry then gets converted to a baryon asymmetry of the universe before the electroweak phase transition. |
0907.4666 | Dmitry Gorbunov | S.N. Gninenko, D.S. Gorbunov | The MiniBooNE anomaly, the decay Ds -> mu+nu and heavy sterile neutrino | 4 pages, 2 figures | Phys.Rev.D81:075013,2010 | 10.1103/PhysRevD.81.075013 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been recently suggested that the anomalous excess of low-energy
electron-like events observed by the MiniBooNE experiment, could be explained
by the radiative decay of a heavy sterile neutrino nu_h of the mass around 500
MeV with a muonic mixing strength in the range |U_{\mu h}|^2 \simeq (1-4)\times
10^{-3}. If such nu_h exists its admixtures in the decay Ds -> mu+nu would
result in the decay Ds -> mu+nu_h with the branching fraction \simeq
(1.2-5.5)\times 10^{-4}, which is in the experimentally accessible range.
Interestingly, the existence of the Ds -> mu+nu_h decay at this level may also
explain why the currently measured decay rate of Ds -> mu+nu is slightly higher
than the predicted one. This enhances motivation for a sensitive search for
this decay mode and makes it interesting and complementary to neutrino
experiments probing sterile-active neutrino mixing. Considering, as an example
the CLEO-c experiment, we suggest to perform a search for the decay Ds ->
mu+nu_h with the analysis of existing data. The discrepancy between the
measurements and theoretical description of the decay Ds -> tau+nu is also
discussed in brief.
| [
{
"created": "Mon, 27 Jul 2009 15:43:17 GMT",
"version": "v1"
}
] | 2010-05-12 | [
[
"Gninenko",
"S. N.",
""
],
[
"Gorbunov",
"D. S.",
""
]
] | It has been recently suggested that the anomalous excess of low-energy electron-like events observed by the MiniBooNE experiment, could be explained by the radiative decay of a heavy sterile neutrino nu_h of the mass around 500 MeV with a muonic mixing strength in the range |U_{\mu h}|^2 \simeq (1-4)\times 10^{-3}. If such nu_h exists its admixtures in the decay Ds -> mu+nu would result in the decay Ds -> mu+nu_h with the branching fraction \simeq (1.2-5.5)\times 10^{-4}, which is in the experimentally accessible range. Interestingly, the existence of the Ds -> mu+nu_h decay at this level may also explain why the currently measured decay rate of Ds -> mu+nu is slightly higher than the predicted one. This enhances motivation for a sensitive search for this decay mode and makes it interesting and complementary to neutrino experiments probing sterile-active neutrino mixing. Considering, as an example the CLEO-c experiment, we suggest to perform a search for the decay Ds -> mu+nu_h with the analysis of existing data. The discrepancy between the measurements and theoretical description of the decay Ds -> tau+nu is also discussed in brief. |
2104.00458 | Luiz Frederic Wagner | Luiz Frederic Wagner | Revisiting Hadronic Mass Relations from First Order Flavor Symmetry
Breaking | null | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The Gell-Mann$-$Okubo (GMO) mass relations following from
$\text{SU}(3)$-flavor symmetry breaking in the strong sector have been proven
to be of great success for describing hadron masses and classifying them into
multiplets. Nowadays, it is widely believed that baryons being fermions have to
obey GMO relations which are linear in the baryon masses, whilst mesons as
bosons follow quadratic GMO relations. In this work, I challenge the
distinction of GMO relations for baryons and mesons and conclude that both
linear and quadratic GMO relations apply to both baryons and mesons in most
instances (exceptions are the pseudoscalar meson octet and the mass relations
following from heavy quark symmetry). I support this claim by presenting an
in-depth analysis of the GMO relations on a theoretical and experimental level.
On the theoretical side, two approaches to the derivation of the GMO relations
are given and isospin symmetry breaking, electromagnetic contributions, and
heavy quark symmetry are incorporated into the mass relations. Both linear and
quadratic mass relations are checked against experimentally determined hadron
masses. Furthermore, the mass relations are used to classify unassigned
resonances like $\Lambda^+_c(2940)$ and $\Xi_c(3123)$ into multiplets and to
predict the masses of missing particles in yet incomplete multiplets.
| [
{
"created": "Thu, 1 Apr 2021 13:42:57 GMT",
"version": "v1"
}
] | 2021-04-02 | [
[
"Wagner",
"Luiz Frederic",
""
]
] | The Gell-Mann$-$Okubo (GMO) mass relations following from $\text{SU}(3)$-flavor symmetry breaking in the strong sector have been proven to be of great success for describing hadron masses and classifying them into multiplets. Nowadays, it is widely believed that baryons being fermions have to obey GMO relations which are linear in the baryon masses, whilst mesons as bosons follow quadratic GMO relations. In this work, I challenge the distinction of GMO relations for baryons and mesons and conclude that both linear and quadratic GMO relations apply to both baryons and mesons in most instances (exceptions are the pseudoscalar meson octet and the mass relations following from heavy quark symmetry). I support this claim by presenting an in-depth analysis of the GMO relations on a theoretical and experimental level. On the theoretical side, two approaches to the derivation of the GMO relations are given and isospin symmetry breaking, electromagnetic contributions, and heavy quark symmetry are incorporated into the mass relations. Both linear and quadratic mass relations are checked against experimentally determined hadron masses. Furthermore, the mass relations are used to classify unassigned resonances like $\Lambda^+_c(2940)$ and $\Xi_c(3123)$ into multiplets and to predict the masses of missing particles in yet incomplete multiplets. |
hep-ph/0111106 | Dilip Kumar Ghosh | Dilip Kumar Ghosh, Xiao-Gang He, Bruce H.J. McKellar, Jian-Qing Shi | Constraining R-parity violating couplings from B --> PP decays using QCD
improved factorization method | 19 pages including two eps figures | JHEP 0207:067,2002 | 10.1088/1126-6708/2002/07/067 | null | hep-ph | null | We investigate the role of R-parity violating interaction in the non-leptonic
decays of B mesons into two light mesons B --> PP. The decay amplitudes are
calculated using the QCD improved factorization method. Using the combined data
on B decays from BaBar, Belle and CLEO, we obtain strong constraints on the
various products of R-parity violating couplings. Many of these new constraints
are stronger than the existing bounds.
| [
{
"created": "Fri, 9 Nov 2001 07:42:55 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Ghosh",
"Dilip Kumar",
""
],
[
"He",
"Xiao-Gang",
""
],
[
"McKellar",
"Bruce H. J.",
""
],
[
"Shi",
"Jian-Qing",
""
]
] | We investigate the role of R-parity violating interaction in the non-leptonic decays of B mesons into two light mesons B --> PP. The decay amplitudes are calculated using the QCD improved factorization method. Using the combined data on B decays from BaBar, Belle and CLEO, we obtain strong constraints on the various products of R-parity violating couplings. Many of these new constraints are stronger than the existing bounds. |
1404.7116 | Fabrizio Caola | Mathias Brucherseifer, Fabrizio Caola and Kirill Melnikov | On the NNLO QCD corrections to single-top production at the LHC | 8 pages, 2 tables, 1 figure | null | 10.1016/j.physletb.2014.06.075 | SFB/CPP-14-23 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a fully-differential calculation of the NNLO QCD corrections to
the t-channel mechanism for producing single top quarks at the LHC. We work in
the structure function approximation, computing QCD corrections to the light-
and heavy-quark lines separately and neglecting the dynamical cross-talk
between the two. The neglected contribution, which appears at NNLO for the
first time, is color-suppressed and is expected to be sub-dominant. Within this
approximation, we find that, for the total cross section, NNLO QCD corrections
are in the few percent range and, therefore, are comparable to NLO QCD
corrections. We also find that the scale independence of the theoretical
prediction for single-top production improves significantly once NNLO QCD
corrections are included. Furthermore, we show how these results change if a
cut on the transverse momentum of the top quark is applied and derive the NNLO
QCD prediction for the ratio of single top and single anti-top production cross
sections at the 8 TeV LHC.
| [
{
"created": "Mon, 28 Apr 2014 19:58:51 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Brucherseifer",
"Mathias",
""
],
[
"Caola",
"Fabrizio",
""
],
[
"Melnikov",
"Kirill",
""
]
] | We present a fully-differential calculation of the NNLO QCD corrections to the t-channel mechanism for producing single top quarks at the LHC. We work in the structure function approximation, computing QCD corrections to the light- and heavy-quark lines separately and neglecting the dynamical cross-talk between the two. The neglected contribution, which appears at NNLO for the first time, is color-suppressed and is expected to be sub-dominant. Within this approximation, we find that, for the total cross section, NNLO QCD corrections are in the few percent range and, therefore, are comparable to NLO QCD corrections. We also find that the scale independence of the theoretical prediction for single-top production improves significantly once NNLO QCD corrections are included. Furthermore, we show how these results change if a cut on the transverse momentum of the top quark is applied and derive the NNLO QCD prediction for the ratio of single top and single anti-top production cross sections at the 8 TeV LHC. |
2209.10569 | Ismail Soudi | Y. Mehtar-Tani, S. Schlichting and I. Soudi | Jet thermalization in QCD kinetic theory | 41 pages, 12 figures, | JHEP05 (2023) 091 | 10.1007/JHEP05(2023)091 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We perform numerical studies in QCD kinetic theory to investigate the energy
and angular profiles of a high energy parton - as a proxy for a jet produced
heavy ion collisions - passing through a Quark-Gluon Plasma (QGP). We find that
the fast parton loses energy to the plasma mainly via a radiative turbulent
gluon cascade that transport energy locally from the jet down to the
temperature scale where dissipation takes place. In this first stage, the
angular structure of the turbulent cascade is found to be relatively
collimated. However, when the lost energy reaches the plasma temperature is it
rapidly transported to large angles w.r.t. the jet axis and thermalizes. We
investigate the contribution of the soft jet constituents to the total jet
energy. We show that for jet opening angles of about 0.3 rad or smaller the
effect is negligible. Conversely, larger opening angles become more and more
sensitive to the thermal component of the jet and thus to medium response. Our
result showcase the importance of the jet cone size in mitigating or enhancing
the details of dissipation in jet quenching observables.
| [
{
"created": "Wed, 21 Sep 2022 18:01:03 GMT",
"version": "v1"
},
{
"created": "Sat, 13 May 2023 13:05:55 GMT",
"version": "v2"
}
] | 2023-05-16 | [
[
"Mehtar-Tani",
"Y.",
""
],
[
"Schlichting",
"S.",
""
],
[
"Soudi",
"I.",
""
]
] | We perform numerical studies in QCD kinetic theory to investigate the energy and angular profiles of a high energy parton - as a proxy for a jet produced heavy ion collisions - passing through a Quark-Gluon Plasma (QGP). We find that the fast parton loses energy to the plasma mainly via a radiative turbulent gluon cascade that transport energy locally from the jet down to the temperature scale where dissipation takes place. In this first stage, the angular structure of the turbulent cascade is found to be relatively collimated. However, when the lost energy reaches the plasma temperature is it rapidly transported to large angles w.r.t. the jet axis and thermalizes. We investigate the contribution of the soft jet constituents to the total jet energy. We show that for jet opening angles of about 0.3 rad or smaller the effect is negligible. Conversely, larger opening angles become more and more sensitive to the thermal component of the jet and thus to medium response. Our result showcase the importance of the jet cone size in mitigating or enhancing the details of dissipation in jet quenching observables. |
1212.0668 | Stefan Rotter | L. A. Chizhova, S. Rotter, T. Jenke, G. Cronenberg, P. Geltenbort, G.
Wautischer, H. Filter H. Abele, J. Burgd\"orfer | Vectorial velocity filter for ultracold neutrons based on a
surface-disordered mirror system | 14 pages, 13 figures; final version including additional experimental
data | Phys. Rev. E 89, 032907 (2014) | 10.1103/PhysRevE.89.032907 | null | hep-ph nlin.CD quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform classical three-dimensional Monte Carlo simulations of ultracold
neutrons scattering through an absorbing-reflecting mirror system in the
Earth's gravitational field. We show that the underlying mixed phase space of
regular skipping motion and random motion due to disorder scattering can be
exploited to realize a vectorial velocity filter for ultracold neutrons. The
absorbing-reflecting mirror system proposed allows beams of ultracold neutrons
with low angular divergence to be formed. The range of velocity components can
be controlled by adjusting the geometric parameters of the system. First
experimental tests of its performance are presented. One potential future
application is the investigation of transport and scattering dynamics in
confined systems downstream of the filter.
| [
{
"created": "Tue, 4 Dec 2012 10:18:26 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Mar 2014 15:54:41 GMT",
"version": "v2"
}
] | 2014-03-20 | [
[
"Chizhova",
"L. A.",
""
],
[
"Rotter",
"S.",
""
],
[
"Jenke",
"T.",
""
],
[
"Cronenberg",
"G.",
""
],
[
"Geltenbort",
"P.",
""
],
[
"Wautischer",
"G.",
""
],
[
"Abele",
"H. Filter H.",
""
],
[
"Burg... | We perform classical three-dimensional Monte Carlo simulations of ultracold neutrons scattering through an absorbing-reflecting mirror system in the Earth's gravitational field. We show that the underlying mixed phase space of regular skipping motion and random motion due to disorder scattering can be exploited to realize a vectorial velocity filter for ultracold neutrons. The absorbing-reflecting mirror system proposed allows beams of ultracold neutrons with low angular divergence to be formed. The range of velocity components can be controlled by adjusting the geometric parameters of the system. First experimental tests of its performance are presented. One potential future application is the investigation of transport and scattering dynamics in confined systems downstream of the filter. |
0709.3749 | Marco Ciminale | R. Anglani, M. Ciminale, N. D. Ippolito | Recent advances in the three flavor Larkin-Ovchinnikov-Fulde-Ferrel
phase of QCD | 5 pages, 6 figures,Contributed to International Workshop on Quantum
Chromodynamics: QCD@Work 2007, Martina Franca, Valle d'Itria, Italy, 16-20
Jun 2007,reference added, typo corrected | AIPConf.Proc.964:272-277,2007 | 10.1063/1.2823862 | BARI-TH 576/07 | hep-ph | null | We present a summary of the recent advances achieved in the study of three
flavor Larkin-Ovchinnikov-Fulde-Ferrell (LOFF)phase of QCD. We have explored,
using a Ginzburg-Landau expansion of the free energy, the LOFF phase with three
flavors, in the simplest single plane wave structure, using the NJL
four-fermion coupling. We have found that this phase does not suffer the
chromo-magnetic instability problem. A preliminary study of astrophysical
effects of quark matter in the aforementioned phase has been done and we have
evaluated self-consistently the strange quark mass extending the pairing ansatz
to the CubeX and 2Cube45z structure. Finally we have investigated the
possibility of Goldstone bosons condensation in the favored cubic structures of
LOFF phase.
| [
{
"created": "Mon, 24 Sep 2007 12:43:11 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Sep 2007 11:08:41 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Anglani",
"R.",
""
],
[
"Ciminale",
"M.",
""
],
[
"Ippolito",
"N. D.",
""
]
] | We present a summary of the recent advances achieved in the study of three flavor Larkin-Ovchinnikov-Fulde-Ferrell (LOFF)phase of QCD. We have explored, using a Ginzburg-Landau expansion of the free energy, the LOFF phase with three flavors, in the simplest single plane wave structure, using the NJL four-fermion coupling. We have found that this phase does not suffer the chromo-magnetic instability problem. A preliminary study of astrophysical effects of quark matter in the aforementioned phase has been done and we have evaluated self-consistently the strange quark mass extending the pairing ansatz to the CubeX and 2Cube45z structure. Finally we have investigated the possibility of Goldstone bosons condensation in the favored cubic structures of LOFF phase. |
1802.01942 | Guruprasad Kadam Dr. | Guruprasad Kadam and Swapnali Pawar | Hadron resonance gas EoS and the fluidity of matter produced in HIC | Revised manuscript, Accepted for publication in Advances in High
Energy Physics | Adv.High Energy Phys. 2019 (2019) 6795041 | 10.1155/2019/6795041 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the equation of state (EoS) of the hot and dense hadron gas by
incorporating the excluded volume corrections into the ideal hadron resonance
gas model (HRG). The total hadron mass spectrum of the model is the sum of
discrete mass spectrum consisting all the experimentally known hadrons and the
exponentially rising continuous Hagedorn states. We confront the EoS of the
model with lattice quantum chromodynamics (LQCD) results at finite baryon
chemical potential. We find that this modified HRG model reproduce the LQCD
results up to T = 160 MeV at zero as well as finite baryon chemical potential.
We further estimate the shear viscosity coefficient within ambit of this model
in the context of heavy-ion collision experiments.
| [
{
"created": "Tue, 6 Feb 2018 13:43:01 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Mar 2019 09:58:10 GMT",
"version": "v2"
}
] | 2019-04-09 | [
[
"Kadam",
"Guruprasad",
""
],
[
"Pawar",
"Swapnali",
""
]
] | We study the equation of state (EoS) of the hot and dense hadron gas by incorporating the excluded volume corrections into the ideal hadron resonance gas model (HRG). The total hadron mass spectrum of the model is the sum of discrete mass spectrum consisting all the experimentally known hadrons and the exponentially rising continuous Hagedorn states. We confront the EoS of the model with lattice quantum chromodynamics (LQCD) results at finite baryon chemical potential. We find that this modified HRG model reproduce the LQCD results up to T = 160 MeV at zero as well as finite baryon chemical potential. We further estimate the shear viscosity coefficient within ambit of this model in the context of heavy-ion collision experiments. |
hep-ph/0001295 | Melles | Michael Melles | The static QCD potential in coordinate space with quark masses through
two loops | 28 pages, Latex2e, 16 eps figures | Phys.Rev. D62 (2000) 074019 | 10.1103/PhysRevD.62.074019 | PSI-PR-00-03 | hep-ph hep-lat | null | The potential between infinitely heavy quarks in a color singlet state is of
fundamental importance in QCD. While the confining long distance part is
inherently non-perturbative, the short-distance (Coulomb-like) regime is
accessible through perturbative means. In this paper we present new results of
the short distance potential in coordinate space with quark masses through two
loops. The results are given in explicit form based on reconstructed solutions
in momentum space in the Euclidean regime. Thus, a comparison with lattice
results in the overlap region between the perturbative and non-perturbative
regime is now possible with massive quarks. We also discuss the definition of
the strong coupling based on the force between the static sources.
| [
{
"created": "Sun, 30 Jan 2000 12:28:08 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Melles",
"Michael",
""
]
] | The potential between infinitely heavy quarks in a color singlet state is of fundamental importance in QCD. While the confining long distance part is inherently non-perturbative, the short-distance (Coulomb-like) regime is accessible through perturbative means. In this paper we present new results of the short distance potential in coordinate space with quark masses through two loops. The results are given in explicit form based on reconstructed solutions in momentum space in the Euclidean regime. Thus, a comparison with lattice results in the overlap region between the perturbative and non-perturbative regime is now possible with massive quarks. We also discuss the definition of the strong coupling based on the force between the static sources. |
hep-ph/9710477 | Pran Nath | Pran Nath and R. Arnowitt | Non-universal Soft SUSY Breaking Effects on Dark Matter and on Physics
at Colliders | Invited talk at the Workshop on Physics beyond the Standard Model
-Accelerator and Non-Accelerator Approaches- Castle Ringberg, Germany, 8-14
June 1997; 10 pages LaTex, 2 Postscript figures | null | null | null | hep-ph | null | Implications of the effects of non-universalities of the soft SUSY breaking
parameters on dark matter and on physics at colliders is discussed.
| [
{
"created": "Sun, 26 Oct 1997 19:24:11 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nath",
"Pran",
""
],
[
"Arnowitt",
"R.",
""
]
] | Implications of the effects of non-universalities of the soft SUSY breaking parameters on dark matter and on physics at colliders is discussed. |
hep-ph/9810423 | Ken Williams | K. Williams | Wilson loop evaluations in the stochastic vacuum model | Latex, 12 pages, revision | null | null | null | hep-ph | null | The stochastic vacuum model description of a heavy meson is discussed in the
context of a gauge invariant approach where Wilson loop expectation values
appear naturally in the O($v^2$) spin-orbit Hamiltonian. These expectation
values have been derived elsewhere, however by a procedure whose legitimacy is
now placed in question. Here they are derived by standard functional methods
with a result that is identical to the previous one. In addition, a full
spin-independent Hamiltonian reduction to O($v^2$) is carried out.
| [
{
"created": "Tue, 20 Oct 1998 19:49:57 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Feb 2001 01:42:10 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Williams",
"K.",
""
]
] | The stochastic vacuum model description of a heavy meson is discussed in the context of a gauge invariant approach where Wilson loop expectation values appear naturally in the O($v^2$) spin-orbit Hamiltonian. These expectation values have been derived elsewhere, however by a procedure whose legitimacy is now placed in question. Here they are derived by standard functional methods with a result that is identical to the previous one. In addition, a full spin-independent Hamiltonian reduction to O($v^2$) is carried out. |
hep-ph/9809221 | Dirk Jungnickel | D.-U. Jungnickel (University of Heidelberg) | The chiral phase transition from the exact RG | 7 pages two-column REVTEX, 7 postscript figures, uses rotate.sty;
talk given at the 5th International Workshop on Thermal Field Theories and
Their Applications, Regensburg, 10 - 14 August 1998 | null | null | HD-THEP 98-39 | hep-ph | null | A brief introduction is given to the concept of the effective average action.
Its dependence on the averaging or coarse graining scale is governed by an
exact RG equation for which nonperturbative approximation schemes are
described. This formalism is applied to the computation of the equation of
state for two flavor QCD within an effective linear quark meson model. Our
results allow to derive the temperature and quark mass dependence of quantities
like the chiral condensate or the pion mass. A precision estimate of the
universal critical equation of state for the three--dimensional O(4) Heisenberg
model is given. The exact RG formalism applied to the linear quark meson model
is demonstrated to provide an explicit link between the O(4) universal behavior
near the critical temperature and zero quark mass on one hand and the physics
at low temperatures and realistic current quark masses, i.e., the domain of
validity of chiral perturbation theory on the other hand.
| [
{
"created": "Tue, 1 Sep 1998 16:28:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Jungnickel",
"D. -U.",
"",
"University of Heidelberg"
]
] | A brief introduction is given to the concept of the effective average action. Its dependence on the averaging or coarse graining scale is governed by an exact RG equation for which nonperturbative approximation schemes are described. This formalism is applied to the computation of the equation of state for two flavor QCD within an effective linear quark meson model. Our results allow to derive the temperature and quark mass dependence of quantities like the chiral condensate or the pion mass. A precision estimate of the universal critical equation of state for the three--dimensional O(4) Heisenberg model is given. The exact RG formalism applied to the linear quark meson model is demonstrated to provide an explicit link between the O(4) universal behavior near the critical temperature and zero quark mass on one hand and the physics at low temperatures and realistic current quark masses, i.e., the domain of validity of chiral perturbation theory on the other hand. |
1501.05291 | Takeshi Fukuyama | T.Fukuyama and K.Asahi | Filling the gaps between model predictions and their prerequisites in
electric dipole moments | 19pages 5 figures Title is changed. One figure and several references
are added | null | 10.1142/S0217751X16500822 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We clarify the conditions or assumptions under which theoretical predictions
of various models beyond the standard model give mainly in electric dipole
moments. The correct interpretation of those conditions seems to be
indispensable to the refinements of model building as well as to the mutual
reliance in experimental and theoritical communities. The connections of these
analyses to the recent experimental results at the LHC and the other places are
also discussed.
| [
{
"created": "Wed, 21 Jan 2015 20:46:34 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Jan 2015 12:56:53 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Mar 2016 03:17:58 GMT",
"version": "v3"
}
] | 2016-06-22 | [
[
"Fukuyama",
"T.",
""
],
[
"Asahi",
"K.",
""
]
] | We clarify the conditions or assumptions under which theoretical predictions of various models beyond the standard model give mainly in electric dipole moments. The correct interpretation of those conditions seems to be indispensable to the refinements of model building as well as to the mutual reliance in experimental and theoritical communities. The connections of these analyses to the recent experimental results at the LHC and the other places are also discussed. |
2211.10231 | Tania Robens | Tania Robens | An overview on low mass scalars at future lepton colliders | 4 pages, 4 figures, contribution to proceedings of 41st International
Conference on High Energy physics - ICHEP2022 | null | null | RBI-ThPhys-2022-47 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Although many suggestions for BSM searches at future colliders exist, most of
them concentrate on additional scalars that have masses higher than the current
SM scalar mass. I will give a short overview on the current status of models
and searches for scalars with masses below this. This work is mainly based on
arXiv:2203.08210, arXiv:2205.09687.
| [
{
"created": "Fri, 18 Nov 2022 13:37:32 GMT",
"version": "v1"
}
] | 2022-11-21 | [
[
"Robens",
"Tania",
""
]
] | Although many suggestions for BSM searches at future colliders exist, most of them concentrate on additional scalars that have masses higher than the current SM scalar mass. I will give a short overview on the current status of models and searches for scalars with masses below this. This work is mainly based on arXiv:2203.08210, arXiv:2205.09687. |
2111.02421 | Yuber F. Perez-Gonzalez | Andr\'e de Gouv\^ea, Emma McGinness, Ivan Martinez-Soler, and Yuber F.
Perez-Gonzalez | $pp$ Solar Neutrinos at DARWIN | 14 pages, 7 figures | null | 10.1103/PhysRevD.106.096017 | NUHEP-TH/21-17, FERMILAB-PUB-21-560-T, IPPP/21/46 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The DARWIN collaboration recently argued that DARWIN (DARk matter WImp search
with liquid xenoN) can collect, via neutrino--electron scattering, a large,
useful sample of solar $pp$-neutrinos, and measure their survival probability
with sub-percent precision. We explore the physics potential of such a sample
in more detail. We estimate that, with 300 ton-years of data, DARWIN can also
measure, with the help of current solar neutrino data, the value of
$\sin^2\theta_{13}$, with the potential to exclude $\sin^2\theta_{13}=0$ close
to the three-sigma level. We explore in some detail how well DARWIN can
constrain the existence of a new neutrino mass-eigenstate $\nu_4$ that is
quasi-mass-degenerate with $\nu_1$ and find that DARWIN's sensitivity
supersedes that of all current and near-future searches for new, very light
neutrinos. In particular, DARWIN can test the hypothesis that $\nu_1$ is a
pseudo-Dirac fermion as long as the induced mass-squared difference is larger
than $10^{-13}$ eV$^2$, one order of magnitude more sensitive than existing
constraints. Throughout, we allowed for the hypotheses that DARWIN is filled
with natural xenon or $^{136}$Xe-depleted xenon.
| [
{
"created": "Wed, 3 Nov 2021 18:00:02 GMT",
"version": "v1"
}
] | 2022-11-30 | [
[
"de Gouvêa",
"André",
""
],
[
"McGinness",
"Emma",
""
],
[
"Martinez-Soler",
"Ivan",
""
],
[
"Perez-Gonzalez",
"Yuber F.",
""
]
] | The DARWIN collaboration recently argued that DARWIN (DARk matter WImp search with liquid xenoN) can collect, via neutrino--electron scattering, a large, useful sample of solar $pp$-neutrinos, and measure their survival probability with sub-percent precision. We explore the physics potential of such a sample in more detail. We estimate that, with 300 ton-years of data, DARWIN can also measure, with the help of current solar neutrino data, the value of $\sin^2\theta_{13}$, with the potential to exclude $\sin^2\theta_{13}=0$ close to the three-sigma level. We explore in some detail how well DARWIN can constrain the existence of a new neutrino mass-eigenstate $\nu_4$ that is quasi-mass-degenerate with $\nu_1$ and find that DARWIN's sensitivity supersedes that of all current and near-future searches for new, very light neutrinos. In particular, DARWIN can test the hypothesis that $\nu_1$ is a pseudo-Dirac fermion as long as the induced mass-squared difference is larger than $10^{-13}$ eV$^2$, one order of magnitude more sensitive than existing constraints. Throughout, we allowed for the hypotheses that DARWIN is filled with natural xenon or $^{136}$Xe-depleted xenon. |
1912.03332 | Salvatore Marco Giampaolo | A. Capolupo, S. M. Giampaolo, G. Lambiase, A. Quaranta | Probing dark matter and quantum field theory effects with Rydberg atoms | 4 pages no figures | The European Physical Journal C volume 80, Article number: 423
(2020) | 10.1140/epjc/s10052-020-7959-x | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the oscillations of Rydberg atoms in the framework of quantum
field theory and we reveal non-trivial vacuum energy which has the equation of
state of the dark matter. This energy is similar to that expected for mixed
neutrinos and affects the thermal capacity of the gas. Therefore, the
deflection of the thermal capacity of Rydberg atoms could prove the condensate
structure of vacuum for mixing fermions and open new scenarios in the study of
the dark components of the universe.
| [
{
"created": "Fri, 6 Dec 2019 20:06:18 GMT",
"version": "v1"
}
] | 2021-01-19 | [
[
"Capolupo",
"A.",
""
],
[
"Giampaolo",
"S. M.",
""
],
[
"Lambiase",
"G.",
""
],
[
"Quaranta",
"A.",
""
]
] | We analyze the oscillations of Rydberg atoms in the framework of quantum field theory and we reveal non-trivial vacuum energy which has the equation of state of the dark matter. This energy is similar to that expected for mixed neutrinos and affects the thermal capacity of the gas. Therefore, the deflection of the thermal capacity of Rydberg atoms could prove the condensate structure of vacuum for mixing fermions and open new scenarios in the study of the dark components of the universe. |
hep-ph/0606275 | Paolo Nason | Paolo Nason, Giovanni Ridolfi | A Positive-Weight Next-to-Leading-Order Monte Carlo for Z Pair
Hadroproduction | 33 pages, 10 figures | JHEP0608:077,2006 | 10.1088/1126-6708/2006/08/077 | Bicocca-FT-06-11; GEF-TH-1/2006 | hep-ph | null | We present a first application of a previously published method for the
computation of QCD processes that is accurate at next-to-leading order, and
that can be interfaced consistently to standard shower Monte Carlo programs. We
have considered Z pair production in hadron-hadron collisions, a process whose
complexity is sufficient to test the general applicability of the method. We
have interfaced our result to the HERWIG and PYTHIA shower Monte Carlo
programs. Previous work on next-to-leading order corrections in a shower Monte
Carlo (the MC@NLO program) may involve the generation of events with negative
weights, that are avoided with the present method. We have compared our results
with those obtained with MC@NLO, and found remarkable consistency. Our method
can also be used as a standalone, alternative implementation of QCD
corrections, with the advantage of positivity, improved convergence, and
next-to-leading logarithmic accuracy in the region of small transverse momentum
of the radiated parton.
| [
{
"created": "Tue, 27 Jun 2006 09:45:16 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Nason",
"Paolo",
""
],
[
"Ridolfi",
"Giovanni",
""
]
] | We present a first application of a previously published method for the computation of QCD processes that is accurate at next-to-leading order, and that can be interfaced consistently to standard shower Monte Carlo programs. We have considered Z pair production in hadron-hadron collisions, a process whose complexity is sufficient to test the general applicability of the method. We have interfaced our result to the HERWIG and PYTHIA shower Monte Carlo programs. Previous work on next-to-leading order corrections in a shower Monte Carlo (the MC@NLO program) may involve the generation of events with negative weights, that are avoided with the present method. We have compared our results with those obtained with MC@NLO, and found remarkable consistency. Our method can also be used as a standalone, alternative implementation of QCD corrections, with the advantage of positivity, improved convergence, and next-to-leading logarithmic accuracy in the region of small transverse momentum of the radiated parton. |
2406.14437 | Tommaso Sassi | Enrico Bertuzzo, Tommaso Sassi, Andrea Tesi | Complex Dark Photon Dark Matter EFT | 39 pages, 8 tables, 8 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct an effective field theory for complex Stueckelberg dark photon
dark matter. Such an effective construction can be realized by writing down a
complete set of operators up to dimension six built with the complex dark
photon and Standard Model fields. Classifying the effective operators, we find
that in order to properly take into account the non-renormalizable nature of an
interacting massive vector, the size of the Wilson coefficients should be
naturally smaller than naively expected. This can be consistently taken into
account by a proper power counting, that we suggest. First we apply this to
collider bounds on light dark matter, then to direct detection searches by
extending the list of non-relativistic operators to include the case of complex
vectors. In the former we correctly find scaling limits for small masses, while
in the latter we mostly focus on electric dipole interactions, that are the
smoking gun of this type of dark matter. Simple UV completions that effectively
realize the above scenarios are also outlined.
| [
{
"created": "Thu, 20 Jun 2024 16:01:58 GMT",
"version": "v1"
}
] | 2024-06-21 | [
[
"Bertuzzo",
"Enrico",
""
],
[
"Sassi",
"Tommaso",
""
],
[
"Tesi",
"Andrea",
""
]
] | We construct an effective field theory for complex Stueckelberg dark photon dark matter. Such an effective construction can be realized by writing down a complete set of operators up to dimension six built with the complex dark photon and Standard Model fields. Classifying the effective operators, we find that in order to properly take into account the non-renormalizable nature of an interacting massive vector, the size of the Wilson coefficients should be naturally smaller than naively expected. This can be consistently taken into account by a proper power counting, that we suggest. First we apply this to collider bounds on light dark matter, then to direct detection searches by extending the list of non-relativistic operators to include the case of complex vectors. In the former we correctly find scaling limits for small masses, while in the latter we mostly focus on electric dipole interactions, that are the smoking gun of this type of dark matter. Simple UV completions that effectively realize the above scenarios are also outlined. |
0706.4017 | Cedran Bomhof | C. J. Bomhof, P. J. Mulders | The Role of Gauge Invariance in Single-Spin Asymmetries | Talk presented at the 15th International Workshop on Deep-Inelastic
Scattering and Related Subjects (DIS 2007), April 16-20, 2007, Munich,
Germany | null | null | null | hep-ph | null | We argue that through the Wilson lines, gauge invariance has as an effect
that the hard functions in weighted spin-asymmetries in hadronic scattering
processes are given by gluonic pole cross sections, rather than the usual
partonic cross sections.
| [
{
"created": "Wed, 27 Jun 2007 12:55:34 GMT",
"version": "v1"
}
] | 2007-06-28 | [
[
"Bomhof",
"C. J.",
""
],
[
"Mulders",
"P. J.",
""
]
] | We argue that through the Wilson lines, gauge invariance has as an effect that the hard functions in weighted spin-asymmetries in hadronic scattering processes are given by gluonic pole cross sections, rather than the usual partonic cross sections. |
2312.04389 | Jean-Philippe Lansberg | Yelyzaveta Yedelkina, Jean-Philippe Lansberg, Maxim Nefedov | Revisiting inclusive production of J/psi and Upsilon in high-energy
gamma-gamma collisions | LaTeX, 6 pages, 16 figures, uses pos.sty. Talk given by Y. Yedelkina
at "The European Physical Society Conference on High Energy Physics
(EPS-HEP2023)", 21-25 August 2023, Hamburg, Germany; submitted to PoS -
Proceedings of Science | null | null | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The impact of Next-to-Leading Order (NLO) QCD corrections to the differential
distributions of J/psi and Upsilon mesons produced inclusively in gamma-gamma
collisions is discussed for the kinematical conditions of LEP II for DELPHI and
at the future Circular Electron-Positron Collider (CEPC). We take into account
all sizeable contributions at LO in v^2 in NRQCD factorisation: 1) pure QED
process gamma + gamma -> J/psi(3S^1_1) + \gamma up to alpha^3 alpha_s, 2)
single-resolved-photon contributions up to alpha_s^4, 3) gamma+gamma -> J/psi +
c c-bar up to alpha^2 alpha_s and 4) gamma+gamma -> J/psi + ggg up to alpha^2
alpha_s^3. We will also discuss the pure QED process as a contribution to the
exclusive production in ultra-peripheral heavy-ion collisions (UPC) at the LHC.
| [
{
"created": "Thu, 7 Dec 2023 16:01:00 GMT",
"version": "v1"
}
] | 2023-12-08 | [
[
"Yedelkina",
"Yelyzaveta",
""
],
[
"Lansberg",
"Jean-Philippe",
""
],
[
"Nefedov",
"Maxim",
""
]
] | The impact of Next-to-Leading Order (NLO) QCD corrections to the differential distributions of J/psi and Upsilon mesons produced inclusively in gamma-gamma collisions is discussed for the kinematical conditions of LEP II for DELPHI and at the future Circular Electron-Positron Collider (CEPC). We take into account all sizeable contributions at LO in v^2 in NRQCD factorisation: 1) pure QED process gamma + gamma -> J/psi(3S^1_1) + \gamma up to alpha^3 alpha_s, 2) single-resolved-photon contributions up to alpha_s^4, 3) gamma+gamma -> J/psi + c c-bar up to alpha^2 alpha_s and 4) gamma+gamma -> J/psi + ggg up to alpha^2 alpha_s^3. We will also discuss the pure QED process as a contribution to the exclusive production in ultra-peripheral heavy-ion collisions (UPC) at the LHC. |
hep-ph/9708294 | Ramona Vogt | R. Vogt (LBNL) | J/\psi Suppression in Pb+Pb Collisions: A New Look at Hadrons vs. Plasma | Calculations redone, figures updated, conclusions unchanged, to be
published in Phys. Lett. B. 13 pages, LaTeX, uses epsf style, 4 figures | Phys.Lett. B430 (1998) 15-22 | 10.1016/S0370-2693(98)00486-9 | LBNL-40680 | hep-ph | null | A reexamination of hadronic comover scattering indicates that this mechanism
cannot explain the observed $\psi$ suppression in Pb+Pb interactions. The
possibility of quark-gluon plasma formation is therefore considered.
| [
{
"created": "Fri, 8 Aug 1997 18:37:58 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Aug 1997 18:18:42 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Apr 1998 03:35:05 GMT",
"version": "v3"
}
] | 2009-10-30 | [
[
"Vogt",
"R.",
"",
"LBNL"
]
] | A reexamination of hadronic comover scattering indicates that this mechanism cannot explain the observed $\psi$ suppression in Pb+Pb interactions. The possibility of quark-gluon plasma formation is therefore considered. |
2111.02159 | Daniel Milne | V. A. Khoze, V. V. Khoze, D. L. Milne and M. G. Ryskin | Central Instanton Production | v2: Added discussion on detection possibility at the LHC, matches
version accepted for publication in PRD | null | 10.1103/PhysRevD.105.036008 | IPPP/21/41 | hep-ph hep-ex hep-th | http://creativecommons.org/licenses/by/4.0/ | We study the central production of QCD instantons at hadron colliders in
events with two large rapidity gaps. These gaps in rapidity are formed by
either Pomeron or photon exchanges or a combination of the two. The
kT-factorization formalism is used to reduce the factorization scale
dependence. We compute for the first time the relevant differential
cross-sections for a complete set of central instanton production processes at
the LHC, including gluon-induced and quark-induced amplitudes, and also show
that the largest contribution comes from processes with Pomeron exchanges where
a single gluon from each Pomeron couples to the instanton.
| [
{
"created": "Wed, 3 Nov 2021 11:59:00 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Nov 2021 14:49:10 GMT",
"version": "v2"
},
{
"created": "Thu, 28 Apr 2022 09:02:38 GMT",
"version": "v3"
}
] | 2022-04-29 | [
[
"Khoze",
"V. A.",
""
],
[
"Khoze",
"V. V.",
""
],
[
"Milne",
"D. L.",
""
],
[
"Ryskin",
"M. G.",
""
]
] | We study the central production of QCD instantons at hadron colliders in events with two large rapidity gaps. These gaps in rapidity are formed by either Pomeron or photon exchanges or a combination of the two. The kT-factorization formalism is used to reduce the factorization scale dependence. We compute for the first time the relevant differential cross-sections for a complete set of central instanton production processes at the LHC, including gluon-induced and quark-induced amplitudes, and also show that the largest contribution comes from processes with Pomeron exchanges where a single gluon from each Pomeron couples to the instanton. |
1508.00595 | D. Ghilencea | D. M. Ghilencea | Manifestly scale-invariant regularization and quantum effective
operators | 16 pages (added references; published version) | Phys. Rev. D 93, 105006 (2016) | 10.1103/PhysRevD.93.105006 | CERN-PH-TH-2015-178 | hep-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scale invariant theories are often used to address the hierarchy problem,
however the regularization of their quantum corrections introduces a
dimensionful coupling (dimensional regularization) or scale (Pauli-Villars,
etc) which break this symmetry explicitly. We show how to avoid this problem
and study the implications of a manifestly scale invariant regularization in
(classical) scale invariant theories. We use a dilaton-dependent subtraction
function $\mu(\sigma)$ which after spontaneous breaking of scale symmetry
generates the usual DR subtraction scale $\mu(\langle\sigma\rangle)$. One
consequence is that "evanescent" interactions generated by scale invariance of
the action in $d=4-2\epsilon$ (but vanishing in $d=4$), give rise to new,
finite quantum corrections. We find a (finite) correction $\Delta
U(\phi,\sigma)$ to the one-loop scalar potential for $\phi$ and $\sigma$,
beyond the Coleman-Weinberg term. $\Delta U$ is due to an evanescent correction
($\propto\epsilon$) to the field-dependent masses (of the states in the loop)
which multiplies the pole ($\propto 1/\epsilon$) of the momentum integral, to
give a finite quantum result. $\Delta U$ contains a non-polynomial operator
$\sim \phi^6/\sigma^2$ of known coefficient and is independent of the
subtraction dimensionless parameter. A more general $\mu(\phi,\sigma)$ is ruled
out since, in their classical decoupling limit, the visible sector (of the
higgs $\phi$) and hidden sector (dilaton $\sigma$) still interact at the
quantum level, thus the subtraction function must depend on the dilaton only.
The method is useful in models where preserving scale symmetry at quantum level
is important.
| [
{
"created": "Mon, 3 Aug 2015 20:42:51 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Aug 2015 17:39:17 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Oct 2015 20:38:45 GMT",
"version": "v3"
},
{
"created": "Wed, 24 Feb 2016 21:18:45 GMT",
"version": "v4"
},
{
"cr... | 2016-06-06 | [
[
"Ghilencea",
"D. M.",
""
]
] | Scale invariant theories are often used to address the hierarchy problem, however the regularization of their quantum corrections introduces a dimensionful coupling (dimensional regularization) or scale (Pauli-Villars, etc) which break this symmetry explicitly. We show how to avoid this problem and study the implications of a manifestly scale invariant regularization in (classical) scale invariant theories. We use a dilaton-dependent subtraction function $\mu(\sigma)$ which after spontaneous breaking of scale symmetry generates the usual DR subtraction scale $\mu(\langle\sigma\rangle)$. One consequence is that "evanescent" interactions generated by scale invariance of the action in $d=4-2\epsilon$ (but vanishing in $d=4$), give rise to new, finite quantum corrections. We find a (finite) correction $\Delta U(\phi,\sigma)$ to the one-loop scalar potential for $\phi$ and $\sigma$, beyond the Coleman-Weinberg term. $\Delta U$ is due to an evanescent correction ($\propto\epsilon$) to the field-dependent masses (of the states in the loop) which multiplies the pole ($\propto 1/\epsilon$) of the momentum integral, to give a finite quantum result. $\Delta U$ contains a non-polynomial operator $\sim \phi^6/\sigma^2$ of known coefficient and is independent of the subtraction dimensionless parameter. A more general $\mu(\phi,\sigma)$ is ruled out since, in their classical decoupling limit, the visible sector (of the higgs $\phi$) and hidden sector (dilaton $\sigma$) still interact at the quantum level, thus the subtraction function must depend on the dilaton only. The method is useful in models where preserving scale symmetry at quantum level is important. |
1004.2741 | Yudi Santoso | Rouzbeh Allahverdi, Bhaskar Dutta, Yudi Santoso | MSSM inflation, dark matter, and the LHC | 9 pages, 9 figures | Phys.Rev.D82:035012,2010 | 10.1103/PhysRevD.82.035012 | MIFPA-10-15 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inflation can occur near a point of inflection in the potential of flat
directions of the Minimal Supersymmetric Standard Model. In this paper we
elaborate on the complementarity between the bounds from Cosmic Microwave
Background measurements, dark matter and particle physics phenomenology in
determining the underlying parameters of MSSM inflation by specializing to the
Minimal Supergravity scenario. We show that the future measurements from the
Large Hadron Collider in tandem with all these constraints will significantly
restrict the allowed parameter space. We also suggest a new perspective on the
fine tuning issue of MSSM inflation. With quantum corrections taken into
account, the necessary condition between the soft supersymmetry breaking
parameters in the inflaton potential can be satisfied at scales of interest
without a fine tuning of their boundary values at a high scale. The requirement
that this happens at the inflection point determines a dimensionless coupling,
which is associated with a non-renormalizable interaction term in the
Lagrangian and has no bearing for phenomenology, to very high accuracy.
| [
{
"created": "Fri, 16 Apr 2010 01:29:54 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Allahverdi",
"Rouzbeh",
""
],
[
"Dutta",
"Bhaskar",
""
],
[
"Santoso",
"Yudi",
""
]
] | Inflation can occur near a point of inflection in the potential of flat directions of the Minimal Supersymmetric Standard Model. In this paper we elaborate on the complementarity between the bounds from Cosmic Microwave Background measurements, dark matter and particle physics phenomenology in determining the underlying parameters of MSSM inflation by specializing to the Minimal Supergravity scenario. We show that the future measurements from the Large Hadron Collider in tandem with all these constraints will significantly restrict the allowed parameter space. We also suggest a new perspective on the fine tuning issue of MSSM inflation. With quantum corrections taken into account, the necessary condition between the soft supersymmetry breaking parameters in the inflaton potential can be satisfied at scales of interest without a fine tuning of their boundary values at a high scale. The requirement that this happens at the inflection point determines a dimensionless coupling, which is associated with a non-renormalizable interaction term in the Lagrangian and has no bearing for phenomenology, to very high accuracy. |
1708.07173 | Stanley J. Brodsky | Stanley J. Brodsky, Stanislaw D. Glazek, Alfred S. Goldhaber, and
Robert W. Brown | Ridge Production in High-Multiplicity Hadronic Ultra-Peripheral
Proton-Proton Collisions | Presented by SJB at Photon 2017: The International Conference on the
Structure and the Interactions of the Photon and the International Workshop
on Photon-Photon Collisions. CERN, May 22-26, 2017. References added | null | null | SLAC-PUB-17106 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An unexpected result at the RHIC and the LHC is the observation that
high-multiplicity hadronic events in heavy-ion and proton-proton collisions are
distributed as two "ridges", approximately flat in rapidity and opposite in
azimuthal angle. We propose that the origin of these events is due to the
inelastic collisions of aligned gluonic flux tubes that underly the color
confinement of the quarks in each proton. We predict that high-multiplicity
hadronic ridges will also be produced in the high energy photon-photon
collisions accessible at the LHC in ultra-peripheral proton-proton collisions
or at a high energy electron-positron collider. We also note the orientation of
the flux tubes between the quark and antiquark of each high energy photon will
be correlated with the plane of the scattered proton or lepton. Thus hadron
production and ridge formation can be controlled in a novel way at the LHC by
observing the azimuthal correlations of the scattering planes of the
ultra-peripheral protons with the orientation of the produced ridges.
Photon-photon collisions can thus illuminate the fundamental physics underlying
the ridge effect and the physics of color confinement in QCD.
| [
{
"created": "Wed, 23 Aug 2017 20:08:33 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Sep 2017 08:06:18 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Oct 2017 04:22:26 GMT",
"version": "v3"
}
] | 2017-10-18 | [
[
"Brodsky",
"Stanley J.",
""
],
[
"Glazek",
"Stanislaw D.",
""
],
[
"Goldhaber",
"Alfred S.",
""
],
[
"Brown",
"Robert W.",
""
]
] | An unexpected result at the RHIC and the LHC is the observation that high-multiplicity hadronic events in heavy-ion and proton-proton collisions are distributed as two "ridges", approximately flat in rapidity and opposite in azimuthal angle. We propose that the origin of these events is due to the inelastic collisions of aligned gluonic flux tubes that underly the color confinement of the quarks in each proton. We predict that high-multiplicity hadronic ridges will also be produced in the high energy photon-photon collisions accessible at the LHC in ultra-peripheral proton-proton collisions or at a high energy electron-positron collider. We also note the orientation of the flux tubes between the quark and antiquark of each high energy photon will be correlated with the plane of the scattered proton or lepton. Thus hadron production and ridge formation can be controlled in a novel way at the LHC by observing the azimuthal correlations of the scattering planes of the ultra-peripheral protons with the orientation of the produced ridges. Photon-photon collisions can thus illuminate the fundamental physics underlying the ridge effect and the physics of color confinement in QCD. |
1906.03577 | Debasish Borah | Devabrat Mahanta, Debasish Borah | Fermion Dark Matter with $N_2$ Leptogenesis in Minimal Scotogenic Model | 40 pages, 18 figures, matches version accepted for publication in
JCAP | null | 10.1088/1475-7516/2019/11/021 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the possibility of singlet fermion dark matter (DM) and successful
leptogenesis in minimal scotogenic model which also provides a common origin of
DM and light neutrino masses. In this scenario, where the standard model (SM)
is extended by three gauge singlet fermions and one additional scalar doublet,
all odd under an in-built $Z_2$ symmetry, the lightest singlet fermion which
also happens to be the lightest $Z_2$ odd particle, can be either thermal or
non-thermal DM candidate depending upon the strength of its couplings with SM
leptons and the $Z_2$ odd scalar doublet. In both the scenarios, the $Z_2$ odd
scalar doublet plays a non-trivial role either by assisting coannihilation with
thermal DM or by providing a source for non-thermal DM via decay. The heavier
$Z_2$ odd singlet fermion produces a net lepton asymmetry through its
out-of-equilibrium decay into SM leptons and $Z_2$ odd scalar doublet. We show
that the requirement of producing the observed baryon asymmetry pushes the
scale of leptogenesis in case of normal ordering of light neutrino masses to
several order of magnitudes above TeV scale. In case of inverted ordering
however, it is possible to have successful $N_2$ leptogenesis at a scale of few
tens of TeV. Inclusion of lepton flavour effects lowers this scale of
leptogenesis by around an order of magnitude in both the cases. Correct DM
abundance can be realised either by thermal freeze-out or by freeze-in
mechanism in different parts of the parameter space that can have interesting
prospects for ongoing experiments.
| [
{
"created": "Sun, 9 Jun 2019 06:34:30 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Nov 2019 18:05:02 GMT",
"version": "v2"
}
] | 2019-11-27 | [
[
"Mahanta",
"Devabrat",
""
],
[
"Borah",
"Debasish",
""
]
] | We study the possibility of singlet fermion dark matter (DM) and successful leptogenesis in minimal scotogenic model which also provides a common origin of DM and light neutrino masses. In this scenario, where the standard model (SM) is extended by three gauge singlet fermions and one additional scalar doublet, all odd under an in-built $Z_2$ symmetry, the lightest singlet fermion which also happens to be the lightest $Z_2$ odd particle, can be either thermal or non-thermal DM candidate depending upon the strength of its couplings with SM leptons and the $Z_2$ odd scalar doublet. In both the scenarios, the $Z_2$ odd scalar doublet plays a non-trivial role either by assisting coannihilation with thermal DM or by providing a source for non-thermal DM via decay. The heavier $Z_2$ odd singlet fermion produces a net lepton asymmetry through its out-of-equilibrium decay into SM leptons and $Z_2$ odd scalar doublet. We show that the requirement of producing the observed baryon asymmetry pushes the scale of leptogenesis in case of normal ordering of light neutrino masses to several order of magnitudes above TeV scale. In case of inverted ordering however, it is possible to have successful $N_2$ leptogenesis at a scale of few tens of TeV. Inclusion of lepton flavour effects lowers this scale of leptogenesis by around an order of magnitude in both the cases. Correct DM abundance can be realised either by thermal freeze-out or by freeze-in mechanism in different parts of the parameter space that can have interesting prospects for ongoing experiments. |
2408.02294 | Jeremy Sakstein | Omar F. Ramadan, Jeremy Sakstein, Djuna Croon | Cosmology and Astrophysics of CP-Violating Axions | 13 pages, 5 figures | null | null | null | hep-ph astro-ph.CO gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the cosmology and astrophysics of axion-like particles (ALPs) with
CP-violating Yukawa couplings to nucleons. At finite nucleon density, the ALP's
dynamics is governed by an effective potential which is the sum of the bare
periodic potential and a linear potential whose strength depends on the nucleon
density. We identify a critical nucleon density $\rho_c$ controlling the
dynamics. At densities smaller than $\rho_c$ the effective potential is a
tilted sinusoidal curve and the field is displaced from its zero-density
minimum. At densities larger than $\rho_c$ the minima (and maxima) are absent,
and the ALP is destabilized. Astrophysically, this implies that neutron stars
can source a radial ALP field, providing a complementary probe to equivalence
principle tests. Cosmologically, the ALP may have been destabilized in the
early Universe and could have made large field excursions. We discuss
model-building applications of our results for such early universe scenarios.
| [
{
"created": "Mon, 5 Aug 2024 08:10:53 GMT",
"version": "v1"
}
] | 2024-08-06 | [
[
"Ramadan",
"Omar F.",
""
],
[
"Sakstein",
"Jeremy",
""
],
[
"Croon",
"Djuna",
""
]
] | We study the cosmology and astrophysics of axion-like particles (ALPs) with CP-violating Yukawa couplings to nucleons. At finite nucleon density, the ALP's dynamics is governed by an effective potential which is the sum of the bare periodic potential and a linear potential whose strength depends on the nucleon density. We identify a critical nucleon density $\rho_c$ controlling the dynamics. At densities smaller than $\rho_c$ the effective potential is a tilted sinusoidal curve and the field is displaced from its zero-density minimum. At densities larger than $\rho_c$ the minima (and maxima) are absent, and the ALP is destabilized. Astrophysically, this implies that neutron stars can source a radial ALP field, providing a complementary probe to equivalence principle tests. Cosmologically, the ALP may have been destabilized in the early Universe and could have made large field excursions. We discuss model-building applications of our results for such early universe scenarios. |
2106.11353 | Mehmet Emre Tasgin | Mehmet Emre Tasgin | Quantization of magnetic flux and electron-positron pair creation | 3 pages | null | null | null | hep-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An electron-positron pair ($e^- e^+$) is created in vacuum above a critical
electric field strength $E_{crt}$ which is quite large in the laboratory scale.
The photon, thus the field, annihilates in the pair creation process. Here, we
question if the pair creation (at $E=E_{crt}$) introduces a boundary condition
in the electromagnetic state, e.g., similar to the one in angular or linear
momentum. We show that introduction of such a reasonable condition yields
approximately the well-known magnetic flux quanta which normally one obtains
using different arguments.
| [
{
"created": "Mon, 21 Jun 2021 18:36:25 GMT",
"version": "v1"
}
] | 2021-06-23 | [
[
"Tasgin",
"Mehmet Emre",
""
]
] | An electron-positron pair ($e^- e^+$) is created in vacuum above a critical electric field strength $E_{crt}$ which is quite large in the laboratory scale. The photon, thus the field, annihilates in the pair creation process. Here, we question if the pair creation (at $E=E_{crt}$) introduces a boundary condition in the electromagnetic state, e.g., similar to the one in angular or linear momentum. We show that introduction of such a reasonable condition yields approximately the well-known magnetic flux quanta which normally one obtains using different arguments. |
1507.02819 | Jian Zhou Mr. | Jian Zhou | A note on the scale dependence of the Burkardt sum rule | 7 pages | Phys. Rev. D 92, 074016 (2015) | 10.1103/PhysRevD.92.074016 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this short note, we argue that the Burkardt sum rule for the Sivers
functions can be used to check the consistency of evolution equations of
three-parton correlators.
| [
{
"created": "Fri, 10 Jul 2015 09:27:42 GMT",
"version": "v1"
}
] | 2015-10-21 | [
[
"Zhou",
"Jian",
""
]
] | In this short note, we argue that the Burkardt sum rule for the Sivers functions can be used to check the consistency of evolution equations of three-parton correlators. |
hep-ph/0306076 | Emidio Gabrielli | D. Chakraverty, E. Gabrielli, K. Huitu, and S. Khalil | Chargino contributions to the CP asymmetry in B -> Phi K(S) decay | 14 pages, LaTeX, 3.eps Figures | Phys.Rev. D68 (2003) 095004 | 10.1103/PhysRevD.68.095004 | null | hep-ph | null | We perform a model independent analysis of the chargino contributions to the
CP asymmetry in B -> Phi K(S) process. We use the mass insertion approximation
method generalized by including the possibility of a light right-stop. We find
that the dominant effect is given by the contributions of the mass insertions
deltaU_LL(32) and deltaU_RL(32) to the Wilson coefficient of the chromomagnetic
operator. By considering both these contributions simultaneously, the CP
asymmetry in B -> Phi K(S) process is significantly reduced and negative
values, which are within the 1-sigma experimental range and satisfy the b -> s
gamma constraints, can be obtained.
| [
{
"created": "Mon, 9 Jun 2003 19:00:04 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Chakraverty",
"D.",
""
],
[
"Gabrielli",
"E.",
""
],
[
"Huitu",
"K.",
""
],
[
"Khalil",
"S.",
""
]
] | We perform a model independent analysis of the chargino contributions to the CP asymmetry in B -> Phi K(S) process. We use the mass insertion approximation method generalized by including the possibility of a light right-stop. We find that the dominant effect is given by the contributions of the mass insertions deltaU_LL(32) and deltaU_RL(32) to the Wilson coefficient of the chromomagnetic operator. By considering both these contributions simultaneously, the CP asymmetry in B -> Phi K(S) process is significantly reduced and negative values, which are within the 1-sigma experimental range and satisfy the b -> s gamma constraints, can be obtained. |
1001.4714 | Anja Marold | Herbi K. Dreiner, Olaf Kittel, Anja Marold | Normal tau polarisation as a sensitive probe of CP violation in chargino
decay | 20 pages, 10 figures, gzipped tar file | Phys.Rev.D82:116005,2010 | 10.1103/PhysRevD.82.116005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | CP violation in the spin-spin correlations in chargino production and
subsequent two-body decay into a tau and a tau-sneutrino is studied at the ILC.
From the normal polarisation of the tau, an asymmetry is defined to test the
CP-violating phase of the higgsino mass parameter \mu. Asymmetries of more than
\pm70% are obtained, also in scenarios with heavy first and second generation
sfermions. Bounds on the statistical significances of the CP asymmetries are
estimated. As a result, the normal tau polarisation in the chargino decay is
one of the most sensitive probes to constrain or measure the phase \phi_\mu at
the ILC, motivating further detailed experimental studies.
| [
{
"created": "Tue, 26 Jan 2010 15:05:57 GMT",
"version": "v1"
}
] | 2010-12-28 | [
[
"Dreiner",
"Herbi K.",
""
],
[
"Kittel",
"Olaf",
""
],
[
"Marold",
"Anja",
""
]
] | CP violation in the spin-spin correlations in chargino production and subsequent two-body decay into a tau and a tau-sneutrino is studied at the ILC. From the normal polarisation of the tau, an asymmetry is defined to test the CP-violating phase of the higgsino mass parameter \mu. Asymmetries of more than \pm70% are obtained, also in scenarios with heavy first and second generation sfermions. Bounds on the statistical significances of the CP asymmetries are estimated. As a result, the normal tau polarisation in the chargino decay is one of the most sensitive probes to constrain or measure the phase \phi_\mu at the ILC, motivating further detailed experimental studies. |
1103.4430 | Kenji Fukushima | Kenji Fukushima | Magnetic-field Induced Screening Effect and Collective Excitations | 5 pages, 3 figures; references on the zero sound added and typos
corrected | Phys.Rev.D83:111501,2011 | 10.1103/PhysRevD.83.111501 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explicitly construct the fermion propagator in a magnetic field background
B to take the lowest Landau-level approximation. We analyze the energy and
momentum dependence in the polarization tensor and discuss the collective
excitations. We find there appear two branches of collective modes in one of
two transverse gauge particles; one represents a massive and attenuated gauge
particle and the other behaves similar to the zero sound at finite density.
| [
{
"created": "Wed, 23 Mar 2011 01:31:07 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Apr 2011 12:13:19 GMT",
"version": "v2"
}
] | 2011-06-08 | [
[
"Fukushima",
"Kenji",
""
]
] | We explicitly construct the fermion propagator in a magnetic field background B to take the lowest Landau-level approximation. We analyze the energy and momentum dependence in the polarization tensor and discuss the collective excitations. We find there appear two branches of collective modes in one of two transverse gauge particles; one represents a massive and attenuated gauge particle and the other behaves similar to the zero sound at finite density. |
hep-ph/0301221 | Z. Xiao | Zhenjun Xiao, Cai-Dian L\"u and Wujun Huo | Technicolor corrections on $B_{s,d} \to \gamma\gamma$ decays in QCD
factorization | 23 pages, Revtex, 9 PS/EPs figures, minor corrections, final version
to appear in Phys.Rev. D | Phys.Rev. D67 (2003) 094021 | 10.1103/PhysRevD.67.094021 | BIHEP-TH-2002-14 | hep-ph | null | Within the framework of the Top-color-assisted Technicolor (TC2) model, we
calculate the new physics contributions to the branching ratios $\calb(B_{s,d}
\to \gamma \gamma)$ and CP violating asymmetries $\rcpm(B_{s,d} \to \gamma
\gamma)$ in the QCD factorization based on the heavy-quark limit $m_b \gg
\Lambda_{QCD}$. Using the considered parameter space, we find that (a) for both
$B_s\to \gamma \gamma$ and $B_d \to \gamma \gamma$ decays, the new physics
contribution can provide a factor of two to six enhancement to their branching
ratios, (b) for the $B_s \to \gamma \gamma$ decay, its direct CP violation is
very small in both the SM and TC2 model, and (c) the CP violating asymmetry
$\rcpm(B_d \to \gamma \gamma)$ is around the ten percent level in both the SM
and TC2 model, but the sign of CP asymmetry in the TC2 model is different from
that in the SM.
| [
{
"created": "Fri, 24 Jan 2003 20:10:15 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Apr 2003 07:23:51 GMT",
"version": "v2"
},
{
"created": "Sun, 11 May 2003 07:37:21 GMT",
"version": "v3"
}
] | 2016-08-16 | [
[
"Xiao",
"Zhenjun",
""
],
[
"Lü",
"Cai-Dian",
""
],
[
"Huo",
"Wujun",
""
]
] | Within the framework of the Top-color-assisted Technicolor (TC2) model, we calculate the new physics contributions to the branching ratios $\calb(B_{s,d} \to \gamma \gamma)$ and CP violating asymmetries $\rcpm(B_{s,d} \to \gamma \gamma)$ in the QCD factorization based on the heavy-quark limit $m_b \gg \Lambda_{QCD}$. Using the considered parameter space, we find that (a) for both $B_s\to \gamma \gamma$ and $B_d \to \gamma \gamma$ decays, the new physics contribution can provide a factor of two to six enhancement to their branching ratios, (b) for the $B_s \to \gamma \gamma$ decay, its direct CP violation is very small in both the SM and TC2 model, and (c) the CP violating asymmetry $\rcpm(B_d \to \gamma \gamma)$ is around the ten percent level in both the SM and TC2 model, but the sign of CP asymmetry in the TC2 model is different from that in the SM. |
2305.06700 | Akira Watanabe | Akira Watanabe, Sayed Anwar Sirat, Zhibo Liu | Elastic proton-neutron and antiproton-neutron scattering in holographic
QCD | 14 pages, 4 figures, typos corrected | null | 10.1140/epjc/s10052-023-12062-0 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The total and differential cross sections of the elastic proton-neutron and
antiproton-neutron scattering are studied in a holographic QCD model, focusing
on the Regge regime. Taking into account the Pomeron and Reggeon exchange,
which are described by the Reggeized spin-2 glueball and vector meson
propagator respectively, those cross sections are obtained. It is presented
that the currently available experimental data of the total cross sections can
be well described within the model. Once a single adjustable parameter is
determined with the total cross section data, the differential cross sections
can be calculated without any additional parameters. Although the available
differential cross section data are limited, it is found that our predictions
are consistent with those.
| [
{
"created": "Thu, 11 May 2023 10:20:43 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Sep 2023 13:53:39 GMT",
"version": "v2"
},
{
"created": "Thu, 28 Mar 2024 08:03:34 GMT",
"version": "v3"
}
] | 2024-03-29 | [
[
"Watanabe",
"Akira",
""
],
[
"Sirat",
"Sayed Anwar",
""
],
[
"Liu",
"Zhibo",
""
]
] | The total and differential cross sections of the elastic proton-neutron and antiproton-neutron scattering are studied in a holographic QCD model, focusing on the Regge regime. Taking into account the Pomeron and Reggeon exchange, which are described by the Reggeized spin-2 glueball and vector meson propagator respectively, those cross sections are obtained. It is presented that the currently available experimental data of the total cross sections can be well described within the model. Once a single adjustable parameter is determined with the total cross section data, the differential cross sections can be calculated without any additional parameters. Although the available differential cross section data are limited, it is found that our predictions are consistent with those. |
1212.5247 | Bryan Zald\'ivar Montero | Maria Eugenia Cabrera, J. Alberto Casas, Bryan Zaldivar | New techniques for chargino-neutralino detection at LHC | accepted for publication in JHEP | null | 10.1007/JHEP08(2013)058 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent LHC discovery of a Higgs-like boson at 126 GeV has important
consequences for SUSY, pushing the spectrum of strong-interacting
supersymmetric particles to high energies, very difficult to probe at the LHC.
This gives extra motivation to study the direct production of electroweak
particles, as charginos and neutralinos, which are presently very poorly
constrained. The aim of this work is to improve the analysis of
chargino-neutralino pair production at LHC, focusing on the kinematics of the
processes. We propose a new method based on the study of the poles of a certain
kinematical variable. This complements other approaches, giving new information
about the spectrum and improving the signal-to-background ratio. We illustrate
the method in particular SUSY models, and show that working with the LHC at
100/fb luminosity one would be able to distinguish the SUSY signal from the
Standard Model background.
| [
{
"created": "Thu, 20 Dec 2012 20:58:37 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Dec 2012 20:26:44 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Feb 2013 18:12:20 GMT",
"version": "v3"
},
{
"created": "Mon, 24 Jun 2013 17:05:20 GMT",
"version": "v4"
}
] | 2015-06-12 | [
[
"Cabrera",
"Maria Eugenia",
""
],
[
"Casas",
"J. Alberto",
""
],
[
"Zaldivar",
"Bryan",
""
]
] | The recent LHC discovery of a Higgs-like boson at 126 GeV has important consequences for SUSY, pushing the spectrum of strong-interacting supersymmetric particles to high energies, very difficult to probe at the LHC. This gives extra motivation to study the direct production of electroweak particles, as charginos and neutralinos, which are presently very poorly constrained. The aim of this work is to improve the analysis of chargino-neutralino pair production at LHC, focusing on the kinematics of the processes. We propose a new method based on the study of the poles of a certain kinematical variable. This complements other approaches, giving new information about the spectrum and improving the signal-to-background ratio. We illustrate the method in particular SUSY models, and show that working with the LHC at 100/fb luminosity one would be able to distinguish the SUSY signal from the Standard Model background. |
1502.07089 | Rahul Sinha | Dibyakrupa Sahoo, Rahul Sinha and N. G. Deshpande | A model independent method for quantitative estimation of $SU(3)$ flavor
symmetry breaking using Dalitz plot | 13 pages, 3 figures | Phys. Rev. D 91, 076013 (2015) | 10.1103/PhysRevD.91.076013 | IMSc/2015/02/01 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The light hadron states are satisfactorily described in the quark model using
$SU(3)$ flavor symmetry. If the $SU(3)$ flavor symmetry relating the light
hadrons were exact, one would have an exchange symmetry between these hadrons
arising out of the exchange of the up, down and strange quarks. This aspect of
$SU(3)$ symmetry is used extensively to relate many decay modes of heavy
quarks. However, the nature of the effects of $SU(3)$ breaking in such decays
is not well understood and hence, a reliable estimate of $SU(3)$ breaking
effects is missing. In this work we propose a new method to quantitatively
estimate the extent of flavor symmetry breaking and better understand the
nature of such breaking using Dalitz plot. We study the three non-commuting
$SU(2)$ symmetries (subsumed in $SU(3)$ flavor symmetry): isospin (or
$T$-spin), $U$-spin and $V$-spin, using the Dalitz plots of some three-body
meson decays. We look at the Dalitz plot distributions of decays in which pairs
of the final three particles are related by two distinct $SU(2)$ symmetries. We
show that such decay modes have characteristic distributions that enable the
measurement of violation of each of the three $SU(2)$ symmetries via Dalitz
plot asymmetries in a single decay mode. Experimental estimates of these easily
measurable asymmetries would help in better understanding the weak decays of
heavy mesons into both two and three light mesons.
| [
{
"created": "Wed, 25 Feb 2015 09:13:21 GMT",
"version": "v1"
}
] | 2015-05-06 | [
[
"Sahoo",
"Dibyakrupa",
""
],
[
"Sinha",
"Rahul",
""
],
[
"Deshpande",
"N. G.",
""
]
] | The light hadron states are satisfactorily described in the quark model using $SU(3)$ flavor symmetry. If the $SU(3)$ flavor symmetry relating the light hadrons were exact, one would have an exchange symmetry between these hadrons arising out of the exchange of the up, down and strange quarks. This aspect of $SU(3)$ symmetry is used extensively to relate many decay modes of heavy quarks. However, the nature of the effects of $SU(3)$ breaking in such decays is not well understood and hence, a reliable estimate of $SU(3)$ breaking effects is missing. In this work we propose a new method to quantitatively estimate the extent of flavor symmetry breaking and better understand the nature of such breaking using Dalitz plot. We study the three non-commuting $SU(2)$ symmetries (subsumed in $SU(3)$ flavor symmetry): isospin (or $T$-spin), $U$-spin and $V$-spin, using the Dalitz plots of some three-body meson decays. We look at the Dalitz plot distributions of decays in which pairs of the final three particles are related by two distinct $SU(2)$ symmetries. We show that such decay modes have characteristic distributions that enable the measurement of violation of each of the three $SU(2)$ symmetries via Dalitz plot asymmetries in a single decay mode. Experimental estimates of these easily measurable asymmetries would help in better understanding the weak decays of heavy mesons into both two and three light mesons. |
0710.3555 | Rachid Benbrik | Abdesslam Arhrib (NCU & Tanger U), Rachid Benbrik (CYCU) and Mohamed
Chabab (UCAM) | H-> WZ and H->Wgamma in the MSSM | Presented at XXVII Physics in Collision - Annecy, France, 26 - 29
June 2007 (to appear in Acta Physica Polonica B) | Acta Phys.Polon.Supp.1:417-418,2008 | null | null | hep-ph | null | We study the complete one loop contribution to $H^\pm\to W^\pm Z$ and $H^\pm
\to W^\pm \gamma$ in the Minimal Supersymmetric Standard Model (MSSM).
| [
{
"created": "Thu, 18 Oct 2007 16:36:24 GMT",
"version": "v1"
}
] | 2009-06-12 | [
[
"Arhrib",
"Abdesslam",
"",
"NCU & Tanger U"
],
[
"Benbrik",
"Rachid",
"",
"CYCU"
],
[
"Chabab",
"Mohamed",
"",
"UCAM"
]
] | We study the complete one loop contribution to $H^\pm\to W^\pm Z$ and $H^\pm \to W^\pm \gamma$ in the Minimal Supersymmetric Standard Model (MSSM). |
1805.00651 | Keisuke Yanagi | Ayuki Kamada, Kunio Kaneta, Keisuke Yanagi, Hai-Bo Yu | Self-interacting dark matter and muon $g-2$ in a gauged U$(1)_{L_{\mu} -
L_{\tau}}$ model | 19 pages, 7 figures; the published version | JHEP 1806 (2018) 117 | 10.1007/JHEP06(2018)117 | CTPU-PTC-18-10, UMN-TH-3716/18, FTPI-MINN-18/07, UT-18-10 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a self-interacting dark matter model that could simultaneously
explain the observed muon anomalous magnetic moment. It is based on a gauged
U$(1)_{L_{\mu} - L_{\tau}}$ extension of the standard model, where we introduce
a vector-like pair of fermions as the dark matter candidate and a new Higgs
boson to break the symmetry. The new gauge boson has a sizable contribution to
muon $(g-2)$, while being consistent with other experimental constraints. The
U$(1)_{L_{\mu} - L_{\tau}}$ Higgs boson acts as a light force carrier,
mediating dark matter self-interactions with a velocity-dependent cross
section. It is large enough in galaxies to thermalize the inner halo and
explain the diverse rotation curves and diminishes towards galaxy clusters.
Since the light mediator dominantly decays to the U$(1)_{L_{\mu} - L_{\tau}}$
gauge boson and neutrinos, the astrophysical and cosmological constraints are
weak. We study the thermal evolution of the model in the early Universe and
derive a lower bound on the gauge boson mass.
| [
{
"created": "Wed, 2 May 2018 07:08:45 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jul 2018 14:47:19 GMT",
"version": "v2"
}
] | 2018-07-31 | [
[
"Kamada",
"Ayuki",
""
],
[
"Kaneta",
"Kunio",
""
],
[
"Yanagi",
"Keisuke",
""
],
[
"Yu",
"Hai-Bo",
""
]
] | We construct a self-interacting dark matter model that could simultaneously explain the observed muon anomalous magnetic moment. It is based on a gauged U$(1)_{L_{\mu} - L_{\tau}}$ extension of the standard model, where we introduce a vector-like pair of fermions as the dark matter candidate and a new Higgs boson to break the symmetry. The new gauge boson has a sizable contribution to muon $(g-2)$, while being consistent with other experimental constraints. The U$(1)_{L_{\mu} - L_{\tau}}$ Higgs boson acts as a light force carrier, mediating dark matter self-interactions with a velocity-dependent cross section. It is large enough in galaxies to thermalize the inner halo and explain the diverse rotation curves and diminishes towards galaxy clusters. Since the light mediator dominantly decays to the U$(1)_{L_{\mu} - L_{\tau}}$ gauge boson and neutrinos, the astrophysical and cosmological constraints are weak. We study the thermal evolution of the model in the early Universe and derive a lower bound on the gauge boson mass. |
1006.2653 | Ansgar Denner | Axel Bredenstein, Ansgar Denner, Stefan Dittmaier, Stefano Pozzorini | Production of t anti-t b anti-b at the LHC at NLO QCD | 6 pages, 8 postscript figures, to appear in proceedings of the "10th
DESY Workshop on Elementary Particle Theory: Loops and Legs in Quantum Field
Theory", Woerlitz, Germany, April 25-30, 2010 | Nucl.Phys.Proc.Suppl.205-206:80-85,2010 | 10.1016/j.nuclphysbps.2010.08.023 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We summarise predictions for top anti-top bottom anti-bottom (tTbB)
production at the LHC in next-to-leading order QCD. The precise description of
this background process is a prerequisite to observe associated top anti-top
Higgs production in the H -> bottom anti-bottom decay channel. The one-loop
amplitudes are computed using Feynman diagrams and numerical tensor reduction.
This approach provides very high numerical stability and CPU efficiency. We
find that the scale choice adopted in ATLAS simulations underestimates the tTbB
background by a factor two and introduce a new dynamical scale that stabilises
the perturbative predictions. In the regime of highly boosted Higgs bosons,
which offers better perspectives to observe the tTH(H-> bB) signal, the
corrections induce significant distortions in the kinematic distributions.
| [
{
"created": "Mon, 14 Jun 2010 10:01:10 GMT",
"version": "v1"
}
] | 2010-12-13 | [
[
"Bredenstein",
"Axel",
""
],
[
"Denner",
"Ansgar",
""
],
[
"Dittmaier",
"Stefan",
""
],
[
"Pozzorini",
"Stefano",
""
]
] | We summarise predictions for top anti-top bottom anti-bottom (tTbB) production at the LHC in next-to-leading order QCD. The precise description of this background process is a prerequisite to observe associated top anti-top Higgs production in the H -> bottom anti-bottom decay channel. The one-loop amplitudes are computed using Feynman diagrams and numerical tensor reduction. This approach provides very high numerical stability and CPU efficiency. We find that the scale choice adopted in ATLAS simulations underestimates the tTbB background by a factor two and introduce a new dynamical scale that stabilises the perturbative predictions. In the regime of highly boosted Higgs bosons, which offers better perspectives to observe the tTH(H-> bB) signal, the corrections induce significant distortions in the kinematic distributions. |
1401.0007 | Andreas Papaefstathiou | Philipp Maierh\"ofer, Andreas Papaefstathiou | Higgs Boson pair production merged to one jet | 19 pages, 10 figures, updated URL | null | 10.1007/JHEP03(2014)126 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a Monte Carlo event generator for Higgs Boson pair production
merged to exact one-jet matrix elements. The matrix elements are generated with
OpenLoops and event generation is performed with the HERWIG++ general-purpose
event generator. This allows us to simulate fully-exclusive hadronic final
states with accurate description of the kinematics of the leading jet in
conjunction with a parton shower. We use the implementation to examine in
detail the systematic uncertainties which result from the merging procedure. We
assess the magnitude of the impact of the merging on experimental searches of
Standard Model di-Higgs production that aim to constrain the Higgs boson
self-coupling. We find that the use of a merged sample can reduce theoretical
systematic uncertainties in the efficiencies of cuts on certain observables.
This constitutes the most accurate simulation of the process available to date.
The Monte Carlo event generator developed for this project is available as an
add-on to the HERWIG++ event generator at http://www.itp.uzh.ch/~andreasp/hh
| [
{
"created": "Mon, 30 Dec 2013 21:00:03 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Aug 2014 15:41:16 GMT",
"version": "v2"
}
] | 2015-06-18 | [
[
"Maierhöfer",
"Philipp",
""
],
[
"Papaefstathiou",
"Andreas",
""
]
] | We develop a Monte Carlo event generator for Higgs Boson pair production merged to exact one-jet matrix elements. The matrix elements are generated with OpenLoops and event generation is performed with the HERWIG++ general-purpose event generator. This allows us to simulate fully-exclusive hadronic final states with accurate description of the kinematics of the leading jet in conjunction with a parton shower. We use the implementation to examine in detail the systematic uncertainties which result from the merging procedure. We assess the magnitude of the impact of the merging on experimental searches of Standard Model di-Higgs production that aim to constrain the Higgs boson self-coupling. We find that the use of a merged sample can reduce theoretical systematic uncertainties in the efficiencies of cuts on certain observables. This constitutes the most accurate simulation of the process available to date. The Monte Carlo event generator developed for this project is available as an add-on to the HERWIG++ event generator at http://www.itp.uzh.ch/~andreasp/hh |
hep-ph/0303129 | Oswald Michaela | D. Diakonov and M. Oswald | Covariant derivative expansion of Yang-Mills effective action at high
temperatures | Minor changes. References added. Paper accepted for publication in
Phys.Rev.D | Phys.Rev.D68:025012,2003 | 10.1103/PhysRevD.68.025012 | null | hep-ph hep-lat hep-th nucl-th | null | Integrating out fast varying quantum fluctuations about Yang--Mills fields
A_i and A_4, we arrive at the effective action for those fields at high
temperatures. Assuming that the fields A_i and A_4 are slowly varying but that
the amplitude of A_4 is arbitrary, we find a non-trivial effective gauge
invariant action both in the electric and magnetic sectors. Our results can be
used for studying correlation functions at high temperatures beyond the
dimensional reduction approximation, as well as for estimating quantum weights
of classical static configurations such as dyons.
| [
{
"created": "Fri, 14 Mar 2003 20:17:10 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jun 2003 19:08:26 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Diakonov",
"D.",
""
],
[
"Oswald",
"M.",
""
]
] | Integrating out fast varying quantum fluctuations about Yang--Mills fields A_i and A_4, we arrive at the effective action for those fields at high temperatures. Assuming that the fields A_i and A_4 are slowly varying but that the amplitude of A_4 is arbitrary, we find a non-trivial effective gauge invariant action both in the electric and magnetic sectors. Our results can be used for studying correlation functions at high temperatures beyond the dimensional reduction approximation, as well as for estimating quantum weights of classical static configurations such as dyons. |
0906.3402 | Kohei Kamada | Kohei Kamada and J. Yokoyama | On the realization of the MSSM inflation | 17pages | Prog.Theor.Phys.122:969-986,2010 | 10.1143/PTP.122.969 | RESCEU-15/09 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the fine-tuning problem on the initial condition of inflation in the
minimal supersymmetric standard model (MSSM), associated with the narrowness of
the slow-roll region. We consider two cases before the onset of the MSSM
inflation, namely, the radiation dominated era and preceding inflationary era.
We find thermal dissipation does not induce additional friction to the
inflaton, so that it does not help enlarge the slow-roll region. We argue
thermal correction to the potential in the preceding radiation dominated era
and quantum fluctuations in the preceding inflationary era disturb field
configuration and prevent the MSSM inflation unless some specific preinflation
history is realized.
| [
{
"created": "Thu, 18 Jun 2009 10:28:04 GMT",
"version": "v1"
}
] | 2010-01-15 | [
[
"Kamada",
"Kohei",
""
],
[
"Yokoyama",
"J.",
""
]
] | We study the fine-tuning problem on the initial condition of inflation in the minimal supersymmetric standard model (MSSM), associated with the narrowness of the slow-roll region. We consider two cases before the onset of the MSSM inflation, namely, the radiation dominated era and preceding inflationary era. We find thermal dissipation does not induce additional friction to the inflaton, so that it does not help enlarge the slow-roll region. We argue thermal correction to the potential in the preceding radiation dominated era and quantum fluctuations in the preceding inflationary era disturb field configuration and prevent the MSSM inflation unless some specific preinflation history is realized. |
1212.6247 | Kentarou Mawatari | Kaoru Hagiwara, Tong Li, Kentarou Mawatari, Junya Nakamura | TauDecay: a library to simulate polarized tau decays via FeynRules and
MadGraph5 | 10 pages, 12 figures, 3 tables; v2: typo in Eq.(20b) corrected,
references added, version accepted by EPJC. 'Note added' also included for
the brief TauDecay instruction in MadGraph5_aMC@NLO | null | 10.1140/epjc/s10052-013-2489-4 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | TauDecay is a library of helicity amplitudes to simulate polarized tau
decays, constructed in the FeynRules and MadGraph5 framework. Together with the
leptonic mode, the decay library includes the main hadronic modes, \tau \to
\nu_{\tau}+\pi, 2\pi, and 3\pi, which are introduced as effective vertices by
using FeynRules. The model file allows us to simulate tau decays when the
on-shell tau production is kinematically forbidden. We also demonstrate that
all possible correlations among the decay products of pair-produced taus
through a Z boson and a scalar/pseudoscalar Higgs boson are produced
automatically. The program has been tested carefully by making use of the
standard tau decay library Tauola.
| [
{
"created": "Wed, 26 Dec 2012 20:46:48 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Dec 2014 21:56:08 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Hagiwara",
"Kaoru",
""
],
[
"Li",
"Tong",
""
],
[
"Mawatari",
"Kentarou",
""
],
[
"Nakamura",
"Junya",
""
]
] | TauDecay is a library of helicity amplitudes to simulate polarized tau decays, constructed in the FeynRules and MadGraph5 framework. Together with the leptonic mode, the decay library includes the main hadronic modes, \tau \to \nu_{\tau}+\pi, 2\pi, and 3\pi, which are introduced as effective vertices by using FeynRules. The model file allows us to simulate tau decays when the on-shell tau production is kinematically forbidden. We also demonstrate that all possible correlations among the decay products of pair-produced taus through a Z boson and a scalar/pseudoscalar Higgs boson are produced automatically. The program has been tested carefully by making use of the standard tau decay library Tauola. |
1810.00605 | Antonio Enrique C\'arcamo Hern\'andez | H. N. Long, N. V. Hop, L. T. Hue, N. H. Thao, A. E. C\'arcamo
Hern\'andez | Higgs and gauge boson phenomenology of the 3-3-1 model with CKS
mechanism | Version accepted for publication in PRD | Phys. Rev. D 100, 015004 (2019) | 10.1103/PhysRevD.100.015004 | null | hep-ph | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We perform a comprehensive analysis of several phenomenological aspects of
the renormalizable extension of the inert 3-3-1 model with sequentially
loop-generated SM fermion mass hierarchy. Special attention is paid to the
study of the constraints arising from the experimental data on the $\rho$
parameter, as well as those ones resulting from the charged lepton flavor
violating process $\mu\to e\gamma$ and dark matter. We also study the single
$Z'$ production via Drell-Yan mechanism at the LHC. We have found that $Z'$
gauge bosons heavier than about $4$ TeV comply with the experimental
constraints on the oblique $\rho$ parameter as well as with the collider
constraints. In addition, we have found that the constraint on the charged
lepton flavor violating decay $\mu\rightarrow e\gamma$ sets the sterile
neutrino masses to be lighter than about $1.12$ TeV. In addition the model
allows charged lepton flavor violating processes within reach of the
forthcoming experiments. The scalar potential and the gauge sector of the model
are analyzed and discussed in detail. Our model successfully accommodates the
observed Dark matter relic density.
| [
{
"created": "Mon, 1 Oct 2018 10:23:09 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jun 2019 17:56:16 GMT",
"version": "v2"
}
] | 2019-07-17 | [
[
"Long",
"H. N.",
""
],
[
"Hop",
"N. V.",
""
],
[
"Hue",
"L. T.",
""
],
[
"Thao",
"N. H.",
""
],
[
"Hernández",
"A. E. Cárcamo",
""
]
] | We perform a comprehensive analysis of several phenomenological aspects of the renormalizable extension of the inert 3-3-1 model with sequentially loop-generated SM fermion mass hierarchy. Special attention is paid to the study of the constraints arising from the experimental data on the $\rho$ parameter, as well as those ones resulting from the charged lepton flavor violating process $\mu\to e\gamma$ and dark matter. We also study the single $Z'$ production via Drell-Yan mechanism at the LHC. We have found that $Z'$ gauge bosons heavier than about $4$ TeV comply with the experimental constraints on the oblique $\rho$ parameter as well as with the collider constraints. In addition, we have found that the constraint on the charged lepton flavor violating decay $\mu\rightarrow e\gamma$ sets the sterile neutrino masses to be lighter than about $1.12$ TeV. In addition the model allows charged lepton flavor violating processes within reach of the forthcoming experiments. The scalar potential and the gauge sector of the model are analyzed and discussed in detail. Our model successfully accommodates the observed Dark matter relic density. |
hep-ph/0102114 | Mihail Chizhov | D. Kirilova and M. Chizhov | Neutrino oscillations in the early Universe | 4 pages, 3 eps figures included, espcrc2.sty, talk at NOW2000
Workshop, 11-16 September 2000, Otranto, Italy, to be published in Nucl.
Phys. B Suppl | Nucl.Phys.Proc.Suppl. 100 (2001) 360-362 | 10.1016/S0920-5632(01)01473-6 | null | hep-ph astro-ph | null | We discuss the oscillations effects on neutrinos in the early Universe and
update the cosmological constraints on the oscillation parameters. It is shown
that sterile LOW solution to the solar neutrino problem is almost completely
excluded from cosmological nucleosynthesis considerations. Two possibilities
for the relaxation of this constraint are discussed: high primordial helium-4
yield and a relic lepton asymmetry present at nucleosynthesis epoch. The
numerical analysis proved that Y_p=0.25 only relaxes the constraint on LOW
solution, while L > 10^{-5} is capable to remove it.
| [
{
"created": "Fri, 9 Feb 2001 15:18:43 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Kirilova",
"D.",
""
],
[
"Chizhov",
"M.",
""
]
] | We discuss the oscillations effects on neutrinos in the early Universe and update the cosmological constraints on the oscillation parameters. It is shown that sterile LOW solution to the solar neutrino problem is almost completely excluded from cosmological nucleosynthesis considerations. Two possibilities for the relaxation of this constraint are discussed: high primordial helium-4 yield and a relic lepton asymmetry present at nucleosynthesis epoch. The numerical analysis proved that Y_p=0.25 only relaxes the constraint on LOW solution, while L > 10^{-5} is capable to remove it. |
2401.05699 | Sasmita Mishra | Sreerupa Chongdar, Sasmita Mishra | Triplet scalar flavored leptogenesis with spontaneous CP violation | null | JCAP04(2024)054 | 10.1088/1475-7516/2024/04/054 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The inclusion of two triplet scalars in the Standard Model (SM) enables to
accommodate neutrino mass generation as well as baryogenesis through
leptogenesis. One of the essential ingredients of leptogenesis is the violation
of charge conjugation and parity (CP) symmetry in lepton number-violating
decays of the triplet scalars. We work on the promising sector of spontaneous
CP violation (SCPV) which is manifested by the involvement of one scalar
singlet and two scalar fields, added to the SM. The predictive aspect of the
model is accomplished by imposing $A_4 \times Z_4$ symmetry which results in
the traditional tribimaximal mixing pattern. With updated data on neutrino
oscillation, we study the parameter space of the model. The phase of the
complex vacuum expectation value (VEV) of the singlet scalar acts as the common
source of CP violation in both low and high-energy sectors. Due to the flavor
symmetry of the model, required baryon asymmetry cannot be accomplished via
unflavored leptogenesis. In the temperature regime, $\left[ 10^{9}, 10^{12}
\right]$ GeV when flavor effects become important in the study of leptogenesis,
it is shown that baryogenesis is achievable. The rich flavor interplay is
explored through the study of the density matrix equations. We also study the
interplay of hierarchical branching ratios of the decay of the triplet scalars
and SCPV phase to accommodate the required CP asymmetry to account for the
final baryon asymmetry in the observational range. Considering all possible
mass hierarchies among the triplet scalars, the flavor structure of the triplet
Yukawa couplings results in different scales of leptogenesis.
| [
{
"created": "Thu, 11 Jan 2024 07:00:34 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Jul 2024 06:32:16 GMT",
"version": "v2"
}
] | 2024-07-17 | [
[
"Chongdar",
"Sreerupa",
""
],
[
"Mishra",
"Sasmita",
""
]
] | The inclusion of two triplet scalars in the Standard Model (SM) enables to accommodate neutrino mass generation as well as baryogenesis through leptogenesis. One of the essential ingredients of leptogenesis is the violation of charge conjugation and parity (CP) symmetry in lepton number-violating decays of the triplet scalars. We work on the promising sector of spontaneous CP violation (SCPV) which is manifested by the involvement of one scalar singlet and two scalar fields, added to the SM. The predictive aspect of the model is accomplished by imposing $A_4 \times Z_4$ symmetry which results in the traditional tribimaximal mixing pattern. With updated data on neutrino oscillation, we study the parameter space of the model. The phase of the complex vacuum expectation value (VEV) of the singlet scalar acts as the common source of CP violation in both low and high-energy sectors. Due to the flavor symmetry of the model, required baryon asymmetry cannot be accomplished via unflavored leptogenesis. In the temperature regime, $\left[ 10^{9}, 10^{12} \right]$ GeV when flavor effects become important in the study of leptogenesis, it is shown that baryogenesis is achievable. The rich flavor interplay is explored through the study of the density matrix equations. We also study the interplay of hierarchical branching ratios of the decay of the triplet scalars and SCPV phase to accommodate the required CP asymmetry to account for the final baryon asymmetry in the observational range. Considering all possible mass hierarchies among the triplet scalars, the flavor structure of the triplet Yukawa couplings results in different scales of leptogenesis. |
2211.05050 | Jian-Bo Cheng | Jian-Bo Cheng, Du-xin Zheng, Zi-Yang Lin and Shi-Lin Zhu | Double-charm and hidden-charm hexaquark states under the complex scaling
method | null | null | 10.1103/PhysRevD.107.054018 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the double-charm and hidden-charm hexaquarks as molecules in
the framework of the one-boson-exchange potential model. The multichannel
coupling and $S-D$ wave mixing are taken into account carefully. We adopt the
complex scaling method to investigate the possible quasibound states, whose
widths are from the three-body decay channel $\Lambda_c\Lambda_c\pi$ or
$\Lambda_c\bar{\Lambda}_c\pi$. For the double-charm system of $I(J^P)=1(1^+)$,
we obtain a quasibound state, whose width is 0.50 MeV if the binding energy is
-14.27 MeV. And the $S$-wave $\Lambda_c\Sigma_c$ and $\Lambda_c\Sigma_c^*$
components give the dominant contributions. For the $1(0^+)$ double-charm
hexaquark system, we do not find any pole. We find more poles in the
hidden-charm hexaquark system. We obtain one pole as a quasibound state in the
$I^G(J^{PC})=1^+(0^{--})$ system, which only has one channel
$(\Lambda_c\bar{\Sigma}_c+\Sigma_c\bar{\Lambda}_c)/\sqrt{2}$. Its width is 1.72
MeV with a binding energy of -5.37 MeV. But, we do not find any pole for the
scalar $1^-(0^{-+})$ system. For the vector $1^-(1^{-+})$ system, we find a
quasibound state. Its energies, widths and constituents are very similar to
those of the $1(1^+)$ double-charm case. In the vector $1^+(1^{--})$ system, we
get two poles -- a quasibound state and a resonance. The quasibound state has a
width of 0.6 MeV with a binding energy of -15.37 MeV. For the resonance, its
width is 2.72 MeV with an energy of 63.55 MeV relative to the
$\Lambda_c\bar{\Sigma}_c$ threshold. And its partial width from the two-body
decay channel $(\Lambda_c\bar{\Sigma}_c-\Sigma_c\bar{\Lambda}_c)/\sqrt{2}$ is
apparently larger than the partial width from the three-body decay channel
$\Lambda_c\bar{\Lambda}_c\pi$.
| [
{
"created": "Wed, 9 Nov 2022 17:32:16 GMT",
"version": "v1"
}
] | 2023-03-29 | [
[
"Cheng",
"Jian-Bo",
""
],
[
"Zheng",
"Du-xin",
""
],
[
"Lin",
"Zi-Yang",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] | We investigate the double-charm and hidden-charm hexaquarks as molecules in the framework of the one-boson-exchange potential model. The multichannel coupling and $S-D$ wave mixing are taken into account carefully. We adopt the complex scaling method to investigate the possible quasibound states, whose widths are from the three-body decay channel $\Lambda_c\Lambda_c\pi$ or $\Lambda_c\bar{\Lambda}_c\pi$. For the double-charm system of $I(J^P)=1(1^+)$, we obtain a quasibound state, whose width is 0.50 MeV if the binding energy is -14.27 MeV. And the $S$-wave $\Lambda_c\Sigma_c$ and $\Lambda_c\Sigma_c^*$ components give the dominant contributions. For the $1(0^+)$ double-charm hexaquark system, we do not find any pole. We find more poles in the hidden-charm hexaquark system. We obtain one pole as a quasibound state in the $I^G(J^{PC})=1^+(0^{--})$ system, which only has one channel $(\Lambda_c\bar{\Sigma}_c+\Sigma_c\bar{\Lambda}_c)/\sqrt{2}$. Its width is 1.72 MeV with a binding energy of -5.37 MeV. But, we do not find any pole for the scalar $1^-(0^{-+})$ system. For the vector $1^-(1^{-+})$ system, we find a quasibound state. Its energies, widths and constituents are very similar to those of the $1(1^+)$ double-charm case. In the vector $1^+(1^{--})$ system, we get two poles -- a quasibound state and a resonance. The quasibound state has a width of 0.6 MeV with a binding energy of -15.37 MeV. For the resonance, its width is 2.72 MeV with an energy of 63.55 MeV relative to the $\Lambda_c\bar{\Sigma}_c$ threshold. And its partial width from the two-body decay channel $(\Lambda_c\bar{\Sigma}_c-\Sigma_c\bar{\Lambda}_c)/\sqrt{2}$ is apparently larger than the partial width from the three-body decay channel $\Lambda_c\bar{\Lambda}_c\pi$. |
2403.06959 | Ming Li | Yuri V. Kovchegov and Ming Li | Gluon Double-Spin Asymmetry in the Longitudinally Polarized $p+p$
Collisions | 33 pages, 7 figures | null | null | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the first-ever small-$x$ expression for the inclusive gluon
production cross section in the central rapidity region of the longitudinally
polarized proton-proton collisions. The cross section depends on the
polarizations of both protons, therefore comprising the numerator of the
longitudinal double-spin asymmetry $A_{LL}$ for the produced gluons. The cross
section is calculated in the shock wave formalism and is expressed in terms of
the polarized dipole scattering amplitudes on the projectile and target
protons. We show that the small-$x$ evolution corrections are included into our
cross section expression if one evolves these polarized dipole amplitudes using
the double-logarithmic helicity evolution derived in \cite{Kovchegov:2015pbl,
Kovchegov:2016zex, Kovchegov:2018znm, Cougoulic:2022gbk}. Our calculation is
performed for the gluon sector only, with the quark contribution left for
future work. When that work is complete, the resulting formula will be
applicable to longitudinally polarized proton-proton and proton-nucleus
collisions, as well as to polarized semi-inclusive deep inelastic scattering
(SIDIS) on a proton or a nucleus. Our results should allow one to extend the
small-$x$ helicity phenomenology analysis of \cite{Adamiak:2023yhz} to the
jet/hadron production data reported for the longitudinally polarized
proton-proton collisions at RHIC and to polarized SIDIS measurements at central
rapidities to be performed at the EIC.
| [
{
"created": "Mon, 11 Mar 2024 17:45:18 GMT",
"version": "v1"
}
] | 2024-03-12 | [
[
"Kovchegov",
"Yuri V.",
""
],
[
"Li",
"Ming",
""
]
] | We derive the first-ever small-$x$ expression for the inclusive gluon production cross section in the central rapidity region of the longitudinally polarized proton-proton collisions. The cross section depends on the polarizations of both protons, therefore comprising the numerator of the longitudinal double-spin asymmetry $A_{LL}$ for the produced gluons. The cross section is calculated in the shock wave formalism and is expressed in terms of the polarized dipole scattering amplitudes on the projectile and target protons. We show that the small-$x$ evolution corrections are included into our cross section expression if one evolves these polarized dipole amplitudes using the double-logarithmic helicity evolution derived in \cite{Kovchegov:2015pbl, Kovchegov:2016zex, Kovchegov:2018znm, Cougoulic:2022gbk}. Our calculation is performed for the gluon sector only, with the quark contribution left for future work. When that work is complete, the resulting formula will be applicable to longitudinally polarized proton-proton and proton-nucleus collisions, as well as to polarized semi-inclusive deep inelastic scattering (SIDIS) on a proton or a nucleus. Our results should allow one to extend the small-$x$ helicity phenomenology analysis of \cite{Adamiak:2023yhz} to the jet/hadron production data reported for the longitudinally polarized proton-proton collisions at RHIC and to polarized SIDIS measurements at central rapidities to be performed at the EIC. |
1707.07144 | Nakul Soni Mr. | N. R. Soni, B. R. Joshi, R. P. Shah, H. R. Chauhan, J. N. Pandya | $Q\bar Q$ ($Q\in \{b, c\}$) spectroscopy using Cornell potential | null | Eur. Phys. J. C 78 (2018) no.7, 592 | 10.1140/epjc/s10052-018-6068-6 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mass spectra and decay properties of heavy quarkonia are computed in
nonrelativistic quark-antiquark Cornell potential model. We have employed the
numerical solution of Schr\"odinger equation to obtain their mass spectra using
only four parameters namely quark mass ($m_c$, $m_b$) and confinement strength
($A_{c\bar c}$, $A_{b\bar b}$). The spin hyperfine, spin-orbit and tensor
components of the one gluon exchange interaction are computed perturbatively to
determine the mass spectra of excited $S$, $P$, $D$ and $F$ states. Digamma,
digluon and dilepton decays of these mesons are computed using the model
parameters and numerical wave functions. The predicted spectroscopy and decay
properties for quarkonia are found to be consistent with available experimental
observations and results from other theoretical models. We also compute mass
spectra and life time of the $B_c$ meson without additional parameters. The
computed electromagnetic transition widths of heavy quarkonia and $B_c$ mesons
are in tune with available experimental data and other theoretical approaches.
| [
{
"created": "Sat, 22 Jul 2017 11:56:13 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Jul 2018 19:31:22 GMT",
"version": "v2"
}
] | 2018-08-06 | [
[
"Soni",
"N. R.",
""
],
[
"Joshi",
"B. R.",
""
],
[
"Shah",
"R. P.",
""
],
[
"Chauhan",
"H. R.",
""
],
[
"Pandya",
"J. N.",
""
]
] | The mass spectra and decay properties of heavy quarkonia are computed in nonrelativistic quark-antiquark Cornell potential model. We have employed the numerical solution of Schr\"odinger equation to obtain their mass spectra using only four parameters namely quark mass ($m_c$, $m_b$) and confinement strength ($A_{c\bar c}$, $A_{b\bar b}$). The spin hyperfine, spin-orbit and tensor components of the one gluon exchange interaction are computed perturbatively to determine the mass spectra of excited $S$, $P$, $D$ and $F$ states. Digamma, digluon and dilepton decays of these mesons are computed using the model parameters and numerical wave functions. The predicted spectroscopy and decay properties for quarkonia are found to be consistent with available experimental observations and results from other theoretical models. We also compute mass spectra and life time of the $B_c$ meson without additional parameters. The computed electromagnetic transition widths of heavy quarkonia and $B_c$ mesons are in tune with available experimental data and other theoretical approaches. |
1410.5768 | Abhishek Basak | Abhishek Basak and S. Shankaranarayanan | Super-inflation and generation of first order vector perturbations in
ELKO | 13 pages | null | 10.1088/1475-7516/2015/05/034 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we construct a model where the first order vector perturbations
can be generated during inflationary expansion. For the non-standard spinors,
known as ELKO, we show that the components of the first order perturbed
energy-momentum tensor of the ELKO is non-zero for pure vector part of the
metric perturbation ($B_{i}$). We show that vector perturbations do not decay
in the super-Hubble scale and for a specific super-inflation background model
we show that the vector perturbations are nearly scale invariant, while its
amplitude is smaller than the primordial scalar perturbations. We also comment
on the generation of vorticity.
| [
{
"created": "Tue, 21 Oct 2014 18:09:51 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Oct 2015 06:21:13 GMT",
"version": "v2"
}
] | 2015-10-22 | [
[
"Basak",
"Abhishek",
""
],
[
"Shankaranarayanan",
"S.",
""
]
] | In this work we construct a model where the first order vector perturbations can be generated during inflationary expansion. For the non-standard spinors, known as ELKO, we show that the components of the first order perturbed energy-momentum tensor of the ELKO is non-zero for pure vector part of the metric perturbation ($B_{i}$). We show that vector perturbations do not decay in the super-Hubble scale and for a specific super-inflation background model we show that the vector perturbations are nearly scale invariant, while its amplitude is smaller than the primordial scalar perturbations. We also comment on the generation of vorticity. |
hep-ph/0104278 | Xavier Calmet | Xavier Calmet, Andrey Neronov | Kaluza-Klein Theories and the Anomalous Magnetic Moment of the Muon | 9 pages | Phys.Rev. D65 (2002) 067702 | 10.1103/PhysRevD.65.067702 | LMU 01/08 | hep-ph hep-th | null | We discuss nonminimal couplings of fermions to the electromagnetic field,
which generically appear in models with extra dimensions. We consider models
where the electromagnetic field is generated by the Kaluza-Klein mechanism. The
nonminimal couplings contribute at tree-level to anomalous magnetic and
electric dipole moments of fermions. We use recent measurements of these
quantities to put limits on the parameters of models with extra dimensions.
| [
{
"created": "Thu, 26 Apr 2001 16:44:27 GMT",
"version": "v1"
},
{
"created": "Wed, 2 May 2001 12:12:04 GMT",
"version": "v2"
},
{
"created": "Thu, 3 May 2001 09:35:07 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Calmet",
"Xavier",
""
],
[
"Neronov",
"Andrey",
""
]
] | We discuss nonminimal couplings of fermions to the electromagnetic field, which generically appear in models with extra dimensions. We consider models where the electromagnetic field is generated by the Kaluza-Klein mechanism. The nonminimal couplings contribute at tree-level to anomalous magnetic and electric dipole moments of fermions. We use recent measurements of these quantities to put limits on the parameters of models with extra dimensions. |
2009.10119 | Frank Deppisch | Frank F. Deppisch, Lukas Graf, Francesco Iachello and Jenni Kotila | Analysis of Light Neutrino Exchange and Short-Range Mechanisms in
$0\nu\beta\beta$ Decay | 54 pages, 10 figures, 14 tables, including appendix, v2 matches
published version | Phys. Rev. D 102, 095016 (2020) | 10.1103/PhysRevD.102.095016 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutrinoless double beta decay ($0\nu\beta\beta$) is a crucial test for
lepton number violation. Observation of this process would have fundamental
implications for neutrino physics, theories beyond the Standard Model and
cosmology. Focussing on so called short-range operators of $0\nu\beta\beta$ and
their potential interplay with the standard light Majorana neutrino exchange,
we present the first complete calculation of the relevant nuclear matrix
elements, performed within the interacting boson model (IBM-2). Furthermore, we
calculate the relevant phase space factors using exact Dirac electron
wavefunctions, taking into account the finite nuclear size and screening by the
electron cloud. The obtained numerical results are presented together with
up-to-date limits on the standard mass mechanism and effective $0\nu\beta\beta$
short-range operators in the IBM-2 framework. Finally, we interpret the limits
in the particle physics scenarios incorporating heavy sterile neutrinos,
Left-Right symmetry and R-parity violating supersymmetry.
| [
{
"created": "Mon, 21 Sep 2020 18:22:52 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Nov 2020 12:09:36 GMT",
"version": "v2"
}
] | 2020-12-01 | [
[
"Deppisch",
"Frank F.",
""
],
[
"Graf",
"Lukas",
""
],
[
"Iachello",
"Francesco",
""
],
[
"Kotila",
"Jenni",
""
]
] | Neutrinoless double beta decay ($0\nu\beta\beta$) is a crucial test for lepton number violation. Observation of this process would have fundamental implications for neutrino physics, theories beyond the Standard Model and cosmology. Focussing on so called short-range operators of $0\nu\beta\beta$ and their potential interplay with the standard light Majorana neutrino exchange, we present the first complete calculation of the relevant nuclear matrix elements, performed within the interacting boson model (IBM-2). Furthermore, we calculate the relevant phase space factors using exact Dirac electron wavefunctions, taking into account the finite nuclear size and screening by the electron cloud. The obtained numerical results are presented together with up-to-date limits on the standard mass mechanism and effective $0\nu\beta\beta$ short-range operators in the IBM-2 framework. Finally, we interpret the limits in the particle physics scenarios incorporating heavy sterile neutrinos, Left-Right symmetry and R-parity violating supersymmetry. |
hep-ph/0008266 | Anne Billups | A.H. Mueller, D.N. Triantafyllopoulos (Columbia University, Physics
Dept., NY,NY) | On the Relationship between Large Order Graphs and Instantons for the
Double Well Oscillator | 26 pages, Latex, 6 figures, 1 table | Nucl.Phys. B595 (2001) 567-586 | 10.1016/S0550-3213(00)00605-2 | CU-TP-983 | hep-ph | null | The double well oscillator is used as a QCD-like model for studying the
relationship between large order graphs and the instanton-antiinstanton
solution. We derive an equation for the perturbative coefficients of the ground
state energy when the number of 3 and/or 4-vertices is fixed and large. These
coefficients are determined in terms of an exact``bounce'' solution. When the
number of 4-vertices is analytically continued to be near the negative of half
the number of 3-vertices the bounce solution approaches the
instanton-antiinstanton solution and detremines leading Borel singularity.
| [
{
"created": "Thu, 24 Aug 2000 18:50:16 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Mueller",
"A. H.",
"",
"Columbia University, Physics\n Dept., NY,NY"
],
[
"Triantafyllopoulos",
"D. N.",
"",
"Columbia University, Physics\n Dept., NY,NY"
]
] | The double well oscillator is used as a QCD-like model for studying the relationship between large order graphs and the instanton-antiinstanton solution. We derive an equation for the perturbative coefficients of the ground state energy when the number of 3 and/or 4-vertices is fixed and large. These coefficients are determined in terms of an exact``bounce'' solution. When the number of 4-vertices is analytically continued to be near the negative of half the number of 3-vertices the bounce solution approaches the instanton-antiinstanton solution and detremines leading Borel singularity. |
hep-ph/0301050 | Hitoshi Murayama | Andre de Gouvea and Hitoshi Murayama | Statistical Test of Anarchy | 5 pages, 2 figures. Improved criteria for testing the hypothesis and
deriving lower limits on theta_{13} | Phys.Lett.B573:94-100,2003 | 10.1016/j.physletb.2003.08.045 | FERMILAB-Pub-03/002-T, UCB-PTH-02/62, LBNL-51969 | hep-ph | null | "Anarchy" is the hypothesis that there is no fundamental distinction among
the three flavors of neutrinos. It describes the mixing angles as random
variables, drawn from well defined probability distributions dictated by the
group Haar measure. We perform a Kolmogorov-Smirnov (KS) statistical test to
verify whether anarchy is consistent with all neutrino data, including the new
result presented by KamLAND. We find a KS probability for Nature's choice of
mixing angles equal to 64%, quite consistent with the anarchical hypothesis. In
turn, assuming that anarchy is indeed correct, we compute lower bounds on
|U_{e3}|^2, the remaining unknown "angle" of the leptonic mixing matrix.
| [
{
"created": "Wed, 8 Jan 2003 20:15:43 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jun 2003 03:20:20 GMT",
"version": "v2"
}
] | 2009-09-29 | [
[
"de Gouvea",
"Andre",
""
],
[
"Murayama",
"Hitoshi",
""
]
] | "Anarchy" is the hypothesis that there is no fundamental distinction among the three flavors of neutrinos. It describes the mixing angles as random variables, drawn from well defined probability distributions dictated by the group Haar measure. We perform a Kolmogorov-Smirnov (KS) statistical test to verify whether anarchy is consistent with all neutrino data, including the new result presented by KamLAND. We find a KS probability for Nature's choice of mixing angles equal to 64%, quite consistent with the anarchical hypothesis. In turn, assuming that anarchy is indeed correct, we compute lower bounds on |U_{e3}|^2, the remaining unknown "angle" of the leptonic mixing matrix. |
1209.0689 | Mart\'in Gonz\'alez-Alonso | Mart\'in Gonz\'alez-Alonso | Beta decays in the LHC era: from ultracold neutrons to colliders | Proceedings of CIPANP 2012 (3 pages) | null | 10.1063/1.4826733 | NPAC-12-13 | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk I review the New Physics reach of semileptonic beta decay
experiments, and their interplay with LHC searches. Assuming the new particles
are heavy enough we can use an Effective Field Theory approach to analyze the
LHC searches, what allows us to perform a direct and model-independent
comparison with low-energy experiments.
| [
{
"created": "Tue, 4 Sep 2012 16:19:23 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"González-Alonso",
"Martín",
""
]
] | In this talk I review the New Physics reach of semileptonic beta decay experiments, and their interplay with LHC searches. Assuming the new particles are heavy enough we can use an Effective Field Theory approach to analyze the LHC searches, what allows us to perform a direct and model-independent comparison with low-energy experiments. |
hep-ph/0105297 | J. J. G\'omez Cadenas | J.J.Gomez-Cadenas (Valencia University & CERN), A. Blondel,
J.Burguet-Castell, D.Casper, M.DOnega, S.Gilardoni, P.Hernandez and
M.Mezzetto | Physics Potential of Very Intense Conventional Neutrino Beams | Talk given at the Venice Conference on Neutrino Telescopes, Venice,
March, 2001 | null | null | IFIC/01-31 | hep-ph | null | The physics potential of high intensity conventional beams is explored. We
consider a low energy super beam which could be produced by a proposed new
accelerator at CERN, the Super Proton Linac. Water Cherenkov and liquid oil
scintillator detectors are studied as possible candidates for a neutrino
oscillation experiment which could improve our current knowledge of the
atmospheric parameters and measure or severely constrain the parameter
connecting the atmospheric and solar realms. It is also shown that a very large
water detector could eventually observe leptonic CP violation. The reach of
such an experiment to the neutrino mixing parameters would lie in-between the
next generation of neutrino experiments (MINOS, OPERA, etc) and a future
neutrino factory.
| [
{
"created": "Tue, 29 May 2001 07:31:20 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gomez-Cadenas",
"J. J.",
"",
"Valencia University & CERN"
],
[
"Blondel",
"A.",
""
],
[
"Burguet-Castell",
"J.",
""
],
[
"Casper",
"D.",
""
],
[
"DOnega",
"M.",
""
],
[
"Gilardoni",
"S.",
""
],
[
"Hernandez",
... | The physics potential of high intensity conventional beams is explored. We consider a low energy super beam which could be produced by a proposed new accelerator at CERN, the Super Proton Linac. Water Cherenkov and liquid oil scintillator detectors are studied as possible candidates for a neutrino oscillation experiment which could improve our current knowledge of the atmospheric parameters and measure or severely constrain the parameter connecting the atmospheric and solar realms. It is also shown that a very large water detector could eventually observe leptonic CP violation. The reach of such an experiment to the neutrino mixing parameters would lie in-between the next generation of neutrino experiments (MINOS, OPERA, etc) and a future neutrino factory. |
2008.06480 | Deepak Sathyan | Kaustubh Agashe, Majid Ekhterachian, Doojin Kim, Deepak Sathyan | LHC Signals for KK Graviton from an Extended Warped Extra Dimension | 37 pages, 9 figures | null | 10.1007/JHEP11(2020)109 | UMD-PP-020-3, MI-TH-2023 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze signals at the Large Hadron Collider (LHC) from production and
decay of Kaluza-Klein (KK) gravitons in the context of "extended" warped
extra-dimensional models, where the standard model (SM) Higgs and fermion
fields are restricted to be in-between the usual ultraviolet/Planck brane and a
$\sim O(10)$ TeV (new, "intermediate") brane, whereas the SM gauge fields (and
gravity) propagate further down to the $\sim O( \hbox{TeV} )$ infrared brane.
Such a framework suppresses flavor violation stemming from KK particle effects,
while keeping the KK gauge bosons and gravitons accessible to the LHC. We find
that the signals from KK graviton are significantly different than in the
standard warped model. This is because the usually dominant decay modes of KK
gravitons into top quark, Higgs and longitudinal $W/Z$ particles are suppressed
by the above spatial separation between these two sets of particles, thus other
decay channels are allowed to shine themselves. In particular, we focus on two
novel decay channels of the KK graviton. The first one is the decay into a pair
of radions, each of which decays (dominantly) into a pair of SM gluons,
resulting in a resonant 4-jet final state consisting of two pairs of dijet
resonance. On the other hand, if the radion is heavier and/or KK gluon is
lighter, then the KK graviton mostly decays into a KK gluon and a SM gluon. The
resulting KK gluon has a significant decay branching fraction into radion and
SM gluon, thereby generating (again) a 4-jet signature, but with a different
underlying event topology, i.e., featuring now three different resonances. We
demonstrate that the High-Luminosity LHC (HL-LHC) has sensitivity to KK
graviton of (up to) $\sim 4$ TeV in both channels, whereas it is unlikely to
have sensitivity in the standard dijet resonance search channel from KK
graviton decay into two gluons.
| [
{
"created": "Fri, 14 Aug 2020 17:35:41 GMT",
"version": "v1"
}
] | 2020-12-30 | [
[
"Agashe",
"Kaustubh",
""
],
[
"Ekhterachian",
"Majid",
""
],
[
"Kim",
"Doojin",
""
],
[
"Sathyan",
"Deepak",
""
]
] | We analyze signals at the Large Hadron Collider (LHC) from production and decay of Kaluza-Klein (KK) gravitons in the context of "extended" warped extra-dimensional models, where the standard model (SM) Higgs and fermion fields are restricted to be in-between the usual ultraviolet/Planck brane and a $\sim O(10)$ TeV (new, "intermediate") brane, whereas the SM gauge fields (and gravity) propagate further down to the $\sim O( \hbox{TeV} )$ infrared brane. Such a framework suppresses flavor violation stemming from KK particle effects, while keeping the KK gauge bosons and gravitons accessible to the LHC. We find that the signals from KK graviton are significantly different than in the standard warped model. This is because the usually dominant decay modes of KK gravitons into top quark, Higgs and longitudinal $W/Z$ particles are suppressed by the above spatial separation between these two sets of particles, thus other decay channels are allowed to shine themselves. In particular, we focus on two novel decay channels of the KK graviton. The first one is the decay into a pair of radions, each of which decays (dominantly) into a pair of SM gluons, resulting in a resonant 4-jet final state consisting of two pairs of dijet resonance. On the other hand, if the radion is heavier and/or KK gluon is lighter, then the KK graviton mostly decays into a KK gluon and a SM gluon. The resulting KK gluon has a significant decay branching fraction into radion and SM gluon, thereby generating (again) a 4-jet signature, but with a different underlying event topology, i.e., featuring now three different resonances. We demonstrate that the High-Luminosity LHC (HL-LHC) has sensitivity to KK graviton of (up to) $\sim 4$ TeV in both channels, whereas it is unlikely to have sensitivity in the standard dijet resonance search channel from KK graviton decay into two gluons. |
2301.00630 | Li-Sheng Geng | Tian-Wei Wu, Si-Qiang Luo, Ming-Zhu Liu, Li-Sheng Geng, and Xiang Liu | Tribaryons with lattice QCD and one-boson exchange potentials | 6 pages, 2 figures, 4 tables, to appear in PRD as a letter | null | null | null | hep-ph hep-ex hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the existence of two-body hadronic molecules composed of
$\Omega\Omega$, $\Omega_{ccc}\Omega_{ccc}$ and $\Omega_{bbb}\Omega_{bbb}$
predicted by lattice QCD simulations, we use the Gaussian expansion method to
investigate whether three-body systems composed of $\Omega\Omega\Omega$,
$\Omega_{ccc}\Omega_{ccc}\Omega_{ccc}$ and
$\Omega_{bbb}\Omega_{bbb}\Omega_{bbb}$ can bind with the two-body $^1S_0$
interactions provided by lattice QCD. Our results show that none of the
three-body systems bind. On the other hand, we find that with the one-boson
exchange potentials the $\Omega\Omega\Omega$ system develops a bound state, for
which the $^5S_2$ interaction plays an important role. Our studies support the
existence of the $\frac{3}{2}^+$ $\Omega\Omega\Omega$ bound state and the
nonexistence of the $\frac{3}{2}^+$ $\Omega_{ccc}\Omega_{ccc}\Omega_{ccc}$ and
$\Omega_{bbb}\Omega_{bbb}\Omega_{bbb}$ bound states, due to the suppressed
$^5S_2$ interactions in heavier systems.
| [
{
"created": "Mon, 2 Jan 2023 12:49:43 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Nov 2023 12:41:52 GMT",
"version": "v2"
}
] | 2023-11-23 | [
[
"Wu",
"Tian-Wei",
""
],
[
"Luo",
"Si-Qiang",
""
],
[
"Liu",
"Ming-Zhu",
""
],
[
"Geng",
"Li-Sheng",
""
],
[
"Liu",
"Xiang",
""
]
] | Motivated by the existence of two-body hadronic molecules composed of $\Omega\Omega$, $\Omega_{ccc}\Omega_{ccc}$ and $\Omega_{bbb}\Omega_{bbb}$ predicted by lattice QCD simulations, we use the Gaussian expansion method to investigate whether three-body systems composed of $\Omega\Omega\Omega$, $\Omega_{ccc}\Omega_{ccc}\Omega_{ccc}$ and $\Omega_{bbb}\Omega_{bbb}\Omega_{bbb}$ can bind with the two-body $^1S_0$ interactions provided by lattice QCD. Our results show that none of the three-body systems bind. On the other hand, we find that with the one-boson exchange potentials the $\Omega\Omega\Omega$ system develops a bound state, for which the $^5S_2$ interaction plays an important role. Our studies support the existence of the $\frac{3}{2}^+$ $\Omega\Omega\Omega$ bound state and the nonexistence of the $\frac{3}{2}^+$ $\Omega_{ccc}\Omega_{ccc}\Omega_{ccc}$ and $\Omega_{bbb}\Omega_{bbb}\Omega_{bbb}$ bound states, due to the suppressed $^5S_2$ interactions in heavier systems. |
1705.03622 | Kang Xian-Wei | Andrea Addazi, Xian-Wei Kang, and Maxim Yu. Khlopov | Testing B-violating signatures from Exotic Instantons in future
colliders | references updated, final version, to be published in Chin.Phys.C | null | 10.1088/1674-1137/41/9/093102 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss possible implications of Exotic Stringy instantons for
Baryon-violating signatures in future colliders. In particular, we discuss
high-energy quarks collisions and $\Lambda-\bar{\Lambda}$ transitions. In
principle, $\Lambda-\bar{\Lambda}$ process can be probed by high-luminosity
electron-positron colliders. However, we find that an extremely high luminosity
is needed in order to provide a (somewhat) stringent bound compared to the
current data on $NN\rightarrow \pi\pi,KK$. On the other hand, (exotic)
instanton-induced six quark interactions can be tested in near future
high-energy colliders beyond LHC, at energies around $20-100\, \rm TeV$. Super
proton-proton collider (SppC) is capable of such measurement given the proposed
energy level of 50-90 TeV. Comparison with other channels is made. In
particular, we show the compatibility of our model with neutron-antineutron and
$NN\rightarrow \pi\pi,KK$ bounds.
| [
{
"created": "Wed, 10 May 2017 06:46:54 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Jun 2017 09:50:06 GMT",
"version": "v2"
}
] | 2017-10-04 | [
[
"Addazi",
"Andrea",
""
],
[
"Kang",
"Xian-Wei",
""
],
[
"Khlopov",
"Maxim Yu.",
""
]
] | We discuss possible implications of Exotic Stringy instantons for Baryon-violating signatures in future colliders. In particular, we discuss high-energy quarks collisions and $\Lambda-\bar{\Lambda}$ transitions. In principle, $\Lambda-\bar{\Lambda}$ process can be probed by high-luminosity electron-positron colliders. However, we find that an extremely high luminosity is needed in order to provide a (somewhat) stringent bound compared to the current data on $NN\rightarrow \pi\pi,KK$. On the other hand, (exotic) instanton-induced six quark interactions can be tested in near future high-energy colliders beyond LHC, at energies around $20-100\, \rm TeV$. Super proton-proton collider (SppC) is capable of such measurement given the proposed energy level of 50-90 TeV. Comparison with other channels is made. In particular, we show the compatibility of our model with neutron-antineutron and $NN\rightarrow \pi\pi,KK$ bounds. |
hep-ph/9609203 | Albert Roeck | A. De Roeck and E. A. De Wolf | An Observation on F_2 at Low x | 10 pages, latex, 5 Figures | Phys.Lett. B388 (1996) 843-847 | 10.1016/S0370-2693(96)01273-7 | DESY 96-143 | hep-ph | null | A simple parametrisation of H1 and ZEUS data at HERA is given for the ranges
in x and Q^2 of 10^{-4} - 5.10^{-2} and 5 - 250 GeV^2, respectively. This
empirical expression is based on a strikingly similar dependence of the average
charged particle multiplicity <n> on the centre of mass system energy sqrt{s}
in e+e- collisions on the one hand, and the x dependence of the proton
structure function F_2 as measured at small x on the other hand. To the best of
our knowledge, this similarity has not been noted before.
| [
{
"created": "Fri, 30 Aug 1996 09:34:06 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"De Roeck",
"A.",
""
],
[
"De Wolf",
"E. A.",
""
]
] | A simple parametrisation of H1 and ZEUS data at HERA is given for the ranges in x and Q^2 of 10^{-4} - 5.10^{-2} and 5 - 250 GeV^2, respectively. This empirical expression is based on a strikingly similar dependence of the average charged particle multiplicity <n> on the centre of mass system energy sqrt{s} in e+e- collisions on the one hand, and the x dependence of the proton structure function F_2 as measured at small x on the other hand. To the best of our knowledge, this similarity has not been noted before. |
hep-ph/9704284 | Lokhtin | I. P. Lokhtin, A. M. Snigirev | Radiative energy loss of hard parton jet in expanding quark-gluon fluid | 11 pages, LaTeX + 2 figures, epsfig.sty | null | null | NPI MSU 97-10/46 | hep-ph | null | The gluon radiation induced by multiple scattering of a hard parton in
expanding quark-gluon plasma is investigated. The radiative energy loss of hard
parton jet is shown to decrease considerably when angular size of extracted jet
goes up, but the fraction of loss survives even for the reasonable wide cone of
angles due to the coherent effects taking into account the rescattering of the
radiated gluons in the QCD medium. The possible application to the jet
quenching phenomenon in heavy ion collisions at LHC energies is discussed.
| [
{
"created": "Thu, 10 Apr 1997 16:09:14 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Apr 1997 06:10:44 GMT",
"version": "v2"
}
] | 2016-09-06 | [
[
"Lokhtin",
"I. P.",
""
],
[
"Snigirev",
"A. M.",
""
]
] | The gluon radiation induced by multiple scattering of a hard parton in expanding quark-gluon plasma is investigated. The radiative energy loss of hard parton jet is shown to decrease considerably when angular size of extracted jet goes up, but the fraction of loss survives even for the reasonable wide cone of angles due to the coherent effects taking into account the rescattering of the radiated gluons in the QCD medium. The possible application to the jet quenching phenomenon in heavy ion collisions at LHC energies is discussed. |
1805.06465 | Pablo Quilez | M.K. Gaillard, M.B. Gavela, R. Houtz, P. Quilez, R. del Rey | Color Unifed Dynamical Axion | 31 pages and 6 figures | null | 10.1140/epjc/s10052-018-6396-6 | IFT-UAM/CSIC-18-050, FTUAM-18-13 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider an enlarged color sector which solves the strong CP problem via
new massless fermions. The spontaneous breaking of a unified color group into
QCD and another confining group provides a source of naturally large axion mass
$m_a$ due to small size instantons. This extra source of axion mass respects
automatically the alignment of the vacuum, ensuring a low-energy CP-conserving
vacuum. The mechanism does not appeal to a $Z_2$ 'mirror' copy of the SM, nor
does it require any fine-tuning of the axion-related couplings at the
unification scale. There is no light axion and uncharacteristically the lighter
spectrum contains instead sterile fermions. The axion scale $f_a$ can be
naturally brought down to a few TeV, with an exotic spectrum of colored
pseudoscalars lighter than this scale, observable at colliders exclusively via
strong interactions. The $\{m_a, f_a\}$ parameter space which allows a solution
of the strong CP problem is thus enlarged well beyond that of invisible axion
models.
| [
{
"created": "Wed, 16 May 2018 18:00:04 GMT",
"version": "v1"
}
] | 2018-12-05 | [
[
"Gaillard",
"M. K.",
""
],
[
"Gavela",
"M. B.",
""
],
[
"Houtz",
"R.",
""
],
[
"Quilez",
"P.",
""
],
[
"del Rey",
"R.",
""
]
] | We consider an enlarged color sector which solves the strong CP problem via new massless fermions. The spontaneous breaking of a unified color group into QCD and another confining group provides a source of naturally large axion mass $m_a$ due to small size instantons. This extra source of axion mass respects automatically the alignment of the vacuum, ensuring a low-energy CP-conserving vacuum. The mechanism does not appeal to a $Z_2$ 'mirror' copy of the SM, nor does it require any fine-tuning of the axion-related couplings at the unification scale. There is no light axion and uncharacteristically the lighter spectrum contains instead sterile fermions. The axion scale $f_a$ can be naturally brought down to a few TeV, with an exotic spectrum of colored pseudoscalars lighter than this scale, observable at colliders exclusively via strong interactions. The $\{m_a, f_a\}$ parameter space which allows a solution of the strong CP problem is thus enlarged well beyond that of invisible axion models. |
hep-ph/9406235 | Jim Ohnemus | J. Ohnemus, S. Rudaz, T.F. Walsh, and P.M. Zerwas | Single Leptoquark Production at Hadron Colliders | 7 LaTex pages plus 2 uuencoded postscript files appended, DESY
94--086, UCD--94--17, UMN--TH--1258/94. Latex and postscipt files are also
available via anonymous ftp at ucdhep.ucdavis.edu in directory
[anonymous.ohnemus.ucd-94-17] | Phys.Lett. B334 (1994) 203-207 | 10.1016/0370-2693(94)90612-2 | null | hep-ph | null | Leptoquarks can be produced in pairs by gluon--gluon fusion and
quark--antiquark annihilation at hadron colliders. While HERA is the proper
machine for single production of $(eu)$ and $(ed)$ type leptoquarks, the flavor
species of ($\mu u$), ($\mu d$) and ($\tau u$), ($\tau d$) type leptoquarks can
be produced at hadron colliders very efficiently. Besides exploiting
gluon-quark collisions, leptoquarks can also be produced singly by colliding
the quarks in one proton beam with leptons $e,\mu,\tau$ generated by splitting
photons which are radiated off the quarks in the other proton beam. For Yukawa
couplings of the size $\alpha$ leptoquark masses up to about 300~GeV can be
generated at the Tevatron while the LHC can produce leptoquarks with masses up
to about 3~TeV. [Leptoquarks involving heavy quarks can be produced singly at a
lower rate, determined by the heavy flavor flux in the proton beam.]
| [
{
"created": "Fri, 3 Jun 1994 23:23:09 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Ohnemus",
"J.",
""
],
[
"Rudaz",
"S.",
""
],
[
"Walsh",
"T. F.",
""
],
[
"Zerwas",
"P. M.",
""
]
] | Leptoquarks can be produced in pairs by gluon--gluon fusion and quark--antiquark annihilation at hadron colliders. While HERA is the proper machine for single production of $(eu)$ and $(ed)$ type leptoquarks, the flavor species of ($\mu u$), ($\mu d$) and ($\tau u$), ($\tau d$) type leptoquarks can be produced at hadron colliders very efficiently. Besides exploiting gluon-quark collisions, leptoquarks can also be produced singly by colliding the quarks in one proton beam with leptons $e,\mu,\tau$ generated by splitting photons which are radiated off the quarks in the other proton beam. For Yukawa couplings of the size $\alpha$ leptoquark masses up to about 300~GeV can be generated at the Tevatron while the LHC can produce leptoquarks with masses up to about 3~TeV. [Leptoquarks involving heavy quarks can be produced singly at a lower rate, determined by the heavy flavor flux in the proton beam.] |
hep-ph/0612271 | Eri Asakawa | Eri Asakawa, Shinya Kanemura, Junichi Kanzaki | Potential for measuring the H^\pm W^\mp Z^0 vertex from WZ fusion at the
Large Hadron Collider | 23 pages, 6 figures, version accepted for publication in Physical
Review D | Phys.Rev.D75:075022,2007 | 10.1103/PhysRevD.75.075022 | null | hep-ph | null | We investigate the possibility of measuring the H^\pm W^\mp Z^0 vertex from
the single $H^\pm$ production process via WZ fusion at the CERN Large Hadron
Collider (LHC). This vertex strongly depends on the structure of the Higgs
sector in various new physics scenarios, so that its measurement can be useful
to distinguish the models. A signal and background simulation under the
expected detector performance at the LHC is done for the processes of pp \to
W^\pm Z^0 X \to H^\pm X \to tbX and pp \to W^\pm Z^0 X \to H^\pm X \to W^\pm
Z^0 X, and the required magnitudes of the H^\pm W^\mp Z^0 vertex for
observation are evaluated. It is found that although the loop induced H^\pm
W^\pm Z^0 vertex in multi-Higgs doublet models cannot be measurable, the latter
process can be useful to test the model with a real and a complex triplets.
| [
{
"created": "Thu, 21 Dec 2006 09:07:25 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Mar 2007 10:53:24 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Asakawa",
"Eri",
""
],
[
"Kanemura",
"Shinya",
""
],
[
"Kanzaki",
"Junichi",
""
]
] | We investigate the possibility of measuring the H^\pm W^\mp Z^0 vertex from the single $H^\pm$ production process via WZ fusion at the CERN Large Hadron Collider (LHC). This vertex strongly depends on the structure of the Higgs sector in various new physics scenarios, so that its measurement can be useful to distinguish the models. A signal and background simulation under the expected detector performance at the LHC is done for the processes of pp \to W^\pm Z^0 X \to H^\pm X \to tbX and pp \to W^\pm Z^0 X \to H^\pm X \to W^\pm Z^0 X, and the required magnitudes of the H^\pm W^\mp Z^0 vertex for observation are evaluated. It is found that although the loop induced H^\pm W^\pm Z^0 vertex in multi-Higgs doublet models cannot be measurable, the latter process can be useful to test the model with a real and a complex triplets. |
1412.3165 | Marc Scott | Johanna Erdmenger, Nick Evans, Marc Scott | Meson spectra of asymptotically free gauge theories from holography | 30 pages, 19 figures | Phys. Rev. D 91, 085004 (2015) | 10.1103/PhysRevD.91.085004 | MPP-2014-573 | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using holography, we study the low-lying mesonic spectrum of a range of
asymptotically free gauge theories. First we revisit a simple top-down
holographic model of QCD-like dynamics with predictions in the M_rho-M_pi
plane. The meson masses in this model are in very good agreement with lattice
gauge theory calculations in the quenched approximation. We show that the key
ingredient for the meson mass predictions is the running of the anomalous
dimension of the quark condensate, gamma. This provides an explanation for the
agreement of holographic and quenched lattice gauge theory calculations. We
then study the `Dynamic AdS/QCD model' in which the gauge theory dynamics is
included by a choice for the running of gamma. We use the naive two-loop
perturbative running of the gauge coupling extrapolated to the non-perturbative
regime to estimate the running of gamma across a number of theories. We
consider models with quarks in the fundamental, adjoint, two-index symmetric
and two-index anti-symmetric representations. We display predictions for M_rho,
M_pi, M_sigma and the lightest glueball mass. Many of these theories, where the
contribution to the running of gamma is dominated by the gluons, give very
similar spectra, which also match with lattice expectations for QCD. On the
other hand, a significant difference between spectra in different holographic
models is seen for theories where the quark content changes the gradient of the
running of gamma around the scale at which chiral symmetry breaking is
triggered at gamma approximately 1. For these walking theories we see an
enhancement of the rho-mass and a suppression of the sigma-mass. Both phenomena
are characteristic for walking behaviour in the physical meson masses.
| [
{
"created": "Wed, 10 Dec 2014 00:46:18 GMT",
"version": "v1"
}
] | 2015-04-08 | [
[
"Erdmenger",
"Johanna",
""
],
[
"Evans",
"Nick",
""
],
[
"Scott",
"Marc",
""
]
] | Using holography, we study the low-lying mesonic spectrum of a range of asymptotically free gauge theories. First we revisit a simple top-down holographic model of QCD-like dynamics with predictions in the M_rho-M_pi plane. The meson masses in this model are in very good agreement with lattice gauge theory calculations in the quenched approximation. We show that the key ingredient for the meson mass predictions is the running of the anomalous dimension of the quark condensate, gamma. This provides an explanation for the agreement of holographic and quenched lattice gauge theory calculations. We then study the `Dynamic AdS/QCD model' in which the gauge theory dynamics is included by a choice for the running of gamma. We use the naive two-loop perturbative running of the gauge coupling extrapolated to the non-perturbative regime to estimate the running of gamma across a number of theories. We consider models with quarks in the fundamental, adjoint, two-index symmetric and two-index anti-symmetric representations. We display predictions for M_rho, M_pi, M_sigma and the lightest glueball mass. Many of these theories, where the contribution to the running of gamma is dominated by the gluons, give very similar spectra, which also match with lattice expectations for QCD. On the other hand, a significant difference between spectra in different holographic models is seen for theories where the quark content changes the gradient of the running of gamma around the scale at which chiral symmetry breaking is triggered at gamma approximately 1. For these walking theories we see an enhancement of the rho-mass and a suppression of the sigma-mass. Both phenomena are characteristic for walking behaviour in the physical meson masses. |
2306.16458 | Rebecca Von Kuk | Pedro Cal, Rebecca von Kuk, Matthew A. Lim, Frank J. Tackmann | The $q_T$ spectrum for Higgs production via heavy quark annihilation at
N$^3$LL$'$+aN$^3$LO | 25 pages + 11 appendix + references, 18 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We study the transverse momentum ($q_T$) spectrum of the Higgs boson produced
via the annihilation of heavy quarks ($s,c,b$) in proton-proton collisions.
Using soft-collinear effective theory (SCET) and working in the five-flavour
scheme, we provide predictions at three-loop order in resummed perturbation
theory (N$^3$LL$'$). We match the resummed calculation to full fixed-order
results at next-to-next-to-leading order (NNLO), and introduce a decorrelation
method to enable a consistent matching to an approximate N$^3$LO (aN$^3$LO)
result. Since the $b$-quark initiated process exhibits large nonsingular
corrections, it requires special care in the matching procedure and estimation
of associated theoretical uncertainties, which we discuss in detail. Our
results constitute the most accurate predictions to date for these processes in
the small $q_T$ region and could be used to improve the determination of Higgs
Yukawa couplings from the shape of the measured Higgs $q_T$ spectrum.
| [
{
"created": "Wed, 28 Jun 2023 18:00:02 GMT",
"version": "v1"
}
] | 2023-06-30 | [
[
"Cal",
"Pedro",
""
],
[
"von Kuk",
"Rebecca",
""
],
[
"Lim",
"Matthew A.",
""
],
[
"Tackmann",
"Frank J.",
""
]
] | We study the transverse momentum ($q_T$) spectrum of the Higgs boson produced via the annihilation of heavy quarks ($s,c,b$) in proton-proton collisions. Using soft-collinear effective theory (SCET) and working in the five-flavour scheme, we provide predictions at three-loop order in resummed perturbation theory (N$^3$LL$'$). We match the resummed calculation to full fixed-order results at next-to-next-to-leading order (NNLO), and introduce a decorrelation method to enable a consistent matching to an approximate N$^3$LO (aN$^3$LO) result. Since the $b$-quark initiated process exhibits large nonsingular corrections, it requires special care in the matching procedure and estimation of associated theoretical uncertainties, which we discuss in detail. Our results constitute the most accurate predictions to date for these processes in the small $q_T$ region and could be used to improve the determination of Higgs Yukawa couplings from the shape of the measured Higgs $q_T$ spectrum. |
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