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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2305.01727 | Sara Khatibi | Sara Khatibi | Neutron decay into a Dark Sector via Leptoquarks | 19 pages, 6 figures | null | 10.1103/PhysRevD.108.055029 | null | hep-ph | http://creativecommons.org/publicdomain/zero/1.0/ | In this paper, we extend the Standard Model (SM) scalar sector with scalar
leptoquarks (LQ) as a portal to the dark sector to resolve some observational
anomalies simultaneously. We introduce LQ coupling to scalar dark matter (DM)
to suggest an exotic decay channel for the neutron into scalar DM and an SM
anti-neutrino. If the branching ratio of this new neutron decay channel is
$1\%$, a long-standing discrepancy in the measured neutron lifetime between two
different experimental methods, bottle and beam experiments, can be solved. The
mass of the scalar DM produced from neutron decay should be in a narrow range
and as a result, its production in the early universe is challenging. We
discuss that the freeze-in mechanism can produce this scalar DM in the early
universe with the correct relic abundance. Then we show that the model can
explain other SM anomalies like the muon $(g-2)$, and $R_{D^{(*)}}$ anomaly
simultaneously.
| [
{
"created": "Tue, 2 May 2023 18:52:43 GMT",
"version": "v1"
},
{
"created": "Sun, 1 Oct 2023 09:26:18 GMT",
"version": "v2"
}
] | 2023-10-03 | [
[
"Khatibi",
"Sara",
""
]
] | In this paper, we extend the Standard Model (SM) scalar sector with scalar leptoquarks (LQ) as a portal to the dark sector to resolve some observational anomalies simultaneously. We introduce LQ coupling to scalar dark matter (DM) to suggest an exotic decay channel for the neutron into scalar DM and an SM anti-neutrino. If the branching ratio of this new neutron decay channel is $1\%$, a long-standing discrepancy in the measured neutron lifetime between two different experimental methods, bottle and beam experiments, can be solved. The mass of the scalar DM produced from neutron decay should be in a narrow range and as a result, its production in the early universe is challenging. We discuss that the freeze-in mechanism can produce this scalar DM in the early universe with the correct relic abundance. Then we show that the model can explain other SM anomalies like the muon $(g-2)$, and $R_{D^{(*)}}$ anomaly simultaneously. |
1302.0743 | Bjorn Garbrecht | Bjorn Garbrecht, Frank Glowna and Matti Herranen | Right-Handed Neutrino Production at Finite Temperature: Radiative
Corrections, Soft and Collinear Divergences | 48 pages, details added, minor corrections | null | 10.1007/JHEP04(2013)099 | TUM-HEP-875-13, TTK-13-02 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The production and decay rate of massive sterile neutrinos at finite
temperature receives next-to-leading order corrections from the gauge
interactions of lepton and Higgs doublets. Using the Closed-Time-Path approach,
we demonstrate that the perturbatively obtained inclusive rate is finite. For
this purpose, we show that soft, collinear and Bose divergences cancel when
adding the tree-level rates from 1<->3 and 2<->2 processes to vertex and
wave-function corrections to 1<->2 processes. These results hold for a general
momentum of the sterile neutrino with respect to the plasma frame. Moreover,
they do not rely on non-relativistic approximations, such that the full
quantum-statistical effects are accounted for to the given order in
perturbation theory. While the neutrino production rate is of relevance for
Leptogenesis, the proposed methods may as well be suitable for application to a
more general class of relativistic transport phenomena.
| [
{
"created": "Mon, 4 Feb 2013 16:14:36 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Feb 2013 19:15:23 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Garbrecht",
"Bjorn",
""
],
[
"Glowna",
"Frank",
""
],
[
"Herranen",
"Matti",
""
]
] | The production and decay rate of massive sterile neutrinos at finite temperature receives next-to-leading order corrections from the gauge interactions of lepton and Higgs doublets. Using the Closed-Time-Path approach, we demonstrate that the perturbatively obtained inclusive rate is finite. For this purpose, we show that soft, collinear and Bose divergences cancel when adding the tree-level rates from 1<->3 and 2<->2 processes to vertex and wave-function corrections to 1<->2 processes. These results hold for a general momentum of the sterile neutrino with respect to the plasma frame. Moreover, they do not rely on non-relativistic approximations, such that the full quantum-statistical effects are accounted for to the given order in perturbation theory. While the neutrino production rate is of relevance for Leptogenesis, the proposed methods may as well be suitable for application to a more general class of relativistic transport phenomena. |
hep-ph/0307083 | Rasulkhozha S. Sharafiddinov | Rasulkhozha S. Sarafiddinov | On the Electric Charge of the Neutrino | 5 pages, LaTex. This version is better for pdf | Dokl.Akad.Nauk Ruz.Ser.Math.Tehn.Estest.7:25-27,1998 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Exact expression is obtained for the differential cross section of elastic
electroweak scattering of longitudinal polarized massive Dirac neutrinos with
the electric charge and anomalous magnetic moment on a spinless nucleus. This
formula contains all necessary information about the nature of the neutrino
mass, charge and magnetic moment. Some of them state that between the mass of
the neutrino its electric charge there exists an interconnection.
| [
{
"created": "Mon, 7 Jul 2003 08:43:55 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Dec 2010 08:15:57 GMT",
"version": "v2"
},
{
"created": "Thu, 9 Dec 2010 07:28:02 GMT",
"version": "v3"
}
] | 2011-02-01 | [
[
"Sarafiddinov",
"Rasulkhozha S.",
""
]
] | Exact expression is obtained for the differential cross section of elastic electroweak scattering of longitudinal polarized massive Dirac neutrinos with the electric charge and anomalous magnetic moment on a spinless nucleus. This formula contains all necessary information about the nature of the neutrino mass, charge and magnetic moment. Some of them state that between the mass of the neutrino its electric charge there exists an interconnection. |
hep-ph/0502231 | Alexander Studenikin | A.Grigoriev, A.Studenikin, A.Ternov | Quantum Theory of Neutrino Spin-Light in Matter | in: Proceedings of Cosmion-2004 (Moscow-St.Peterburg, Paris-Meudon,
2004), ed. by M.Khlopov, K.Bronnikov; Gravitation & Cosmology 11 (2005) 1 | Grav.Cosmol. 11 (2005) 132-138 | null | null | hep-ph | null | The quantum theory of the spin light of neutrino ($SL\nu$) exactly accounting
for the effect of the background matter is developed. The $SL\nu$ rate and
power, and also the emitted photon's energy are obtained for the different
values of the neutrino momentum and density of matter. The spatial distribution
of the radiation power and the dependence of the emitted photon's energy on the
direction of radiation are studied. It is also shown that, in a wide range of
the neutrino momentum and densities of matter, the $SL\nu$ radiation is
characterized by nearly total circular polarization. Conditions for the
effective neutrino spin-light radiation in the electron plasma are discussed.
| [
{
"created": "Fri, 25 Feb 2005 14:47:49 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Jul 2005 18:41:43 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Grigoriev",
"A.",
""
],
[
"Studenikin",
"A.",
""
],
[
"Ternov",
"A.",
""
]
] | The quantum theory of the spin light of neutrino ($SL\nu$) exactly accounting for the effect of the background matter is developed. The $SL\nu$ rate and power, and also the emitted photon's energy are obtained for the different values of the neutrino momentum and density of matter. The spatial distribution of the radiation power and the dependence of the emitted photon's energy on the direction of radiation are studied. It is also shown that, in a wide range of the neutrino momentum and densities of matter, the $SL\nu$ radiation is characterized by nearly total circular polarization. Conditions for the effective neutrino spin-light radiation in the electron plasma are discussed. |
hep-ph/0103153 | Sergey Cherkas | Sergey L. Cherkas (Institute of Nuclear Problems, Minsk, Belarus) | Possibility of T-violating P-conserving magnetism and its contribution
to the T-odd P-even neutron-nucleus forward elastic scattering amplitude | LaTeX, 7 pages | Eur.Phys.J.C19:471-476,2001 | 10.1007/s100520100624 | null | hep-ph | null | T-violating P-even magnetism is considered. The magnetism arises from the
T-violating P-conserving vertex of a spin 1/2 particle interaction with the
electromagnetic field. The vertex varnishes for a particle on the mass shell.
Considering the particle interaction with a point electric charge we have
obtained the T-violating P-even spin dependent potential which is inversely
proportional to the cubed distance from the charge. The matrix element of this
potential is zero for particle states on the mass shell, nevertheless, the
potential contributes to the T-odd P-even neutron forward elastic scattering
amplitude by a deformed nucleus with spin S>1/2. The contribution arises if we
take into account incident neutron plane wave distortion by the strong neutron
interaction with the nucleus.
| [
{
"created": "Wed, 14 Mar 2001 11:40:31 GMT",
"version": "v1"
}
] | 2009-01-07 | [
[
"Cherkas",
"Sergey L.",
"",
"Institute of Nuclear Problems, Minsk, Belarus"
]
] | T-violating P-even magnetism is considered. The magnetism arises from the T-violating P-conserving vertex of a spin 1/2 particle interaction with the electromagnetic field. The vertex varnishes for a particle on the mass shell. Considering the particle interaction with a point electric charge we have obtained the T-violating P-even spin dependent potential which is inversely proportional to the cubed distance from the charge. The matrix element of this potential is zero for particle states on the mass shell, nevertheless, the potential contributes to the T-odd P-even neutron forward elastic scattering amplitude by a deformed nucleus with spin S>1/2. The contribution arises if we take into account incident neutron plane wave distortion by the strong neutron interaction with the nucleus. |
1311.0397 | Kim Maltman | P.A. Boyle, L. Del Debbio, N. Garron, R.J. Hudspith, E. Kerrane, K.
Maltman and J.M. Zanotti | $L_{10}^r$ From a Combined NNLO Lattice, Continuum Analysis of the Light
Quark V-A Correlator | 7 pages, 2 figures. Prepared for the proceedings of the 31st
International Symposium on Lattice Field Theory, July 29-August 3, 2013,
Mainz, Germany | null | null | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A combination of lattice and continuum data for the light-quark V-A
correlator, supplemented by results from a chiral sum-rule analysis of the
flavor-breaking flavor $ud$-$us$ V-A correlator difference, is shown to make
possible a high-precision NNLO determination of the renormalized NLO chiral
low-energy constant $L_{10}^r$. Key to this determination is the ability to
simultaneously fix the two combinations of NNLO low-energy constants also
entering the analysis. With current versions of the strange hadronic $\tau$
branching fractions required as input to the flavor-breaking V-A sum rule, we
find $L_{10}^r(m_\rho ) = -0.00346(29)$. This represents both the best current
precision for $L_{10}^r$, and the first NNLO determination having all errors
under full control.
| [
{
"created": "Sat, 2 Nov 2013 17:41:34 GMT",
"version": "v1"
}
] | 2013-11-05 | [
[
"Boyle",
"P. A.",
""
],
[
"Del Debbio",
"L.",
""
],
[
"Garron",
"N.",
""
],
[
"Hudspith",
"R. J.",
""
],
[
"Kerrane",
"E.",
""
],
[
"Maltman",
"K.",
""
],
[
"Zanotti",
"J. M.",
""
]
] | A combination of lattice and continuum data for the light-quark V-A correlator, supplemented by results from a chiral sum-rule analysis of the flavor-breaking flavor $ud$-$us$ V-A correlator difference, is shown to make possible a high-precision NNLO determination of the renormalized NLO chiral low-energy constant $L_{10}^r$. Key to this determination is the ability to simultaneously fix the two combinations of NNLO low-energy constants also entering the analysis. With current versions of the strange hadronic $\tau$ branching fractions required as input to the flavor-breaking V-A sum rule, we find $L_{10}^r(m_\rho ) = -0.00346(29)$. This represents both the best current precision for $L_{10}^r$, and the first NNLO determination having all errors under full control. |
hep-ph/9910226 | J. William GARY | A. Capella, I.M. Dremin, J.W. Gary, V.A. Nechitailo, J. Tran Thanh Van | Evolution of average multiplicities of quark and gluon jets | 23 pages including 3 figures. Version 2 contains small correction to
equation (41) | Phys.Rev. D61 (2000) 074009 | 10.1103/PhysRevD.61.074009 | FIAN-TD22-99, LPT-9974, UCRHEP-E264 | hep-ph | null | The energy evolution of average multiplicities of quark and gluon jets is
studied in perturbative QCD. Higher order (3NLO) terms in the perturbative
expansion of equations for the generating functions are found. First and second
derivatives of average multiplicities are calculated. The mean multiplicity of
gluon jets is larger than that of quark jets and evolves more rapidly with
energy. It is shown which quantities are most sensitive to higher order
perturbative and nonperturbative corrections. We define the energy regions
where the corrections to different quantities are important. The latest
experimental data are discussed.
| [
{
"created": "Mon, 4 Oct 1999 19:51:41 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Oct 1999 22:36:13 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Capella",
"A.",
""
],
[
"Dremin",
"I. M.",
""
],
[
"Gary",
"J. W.",
""
],
[
"Nechitailo",
"V. A.",
""
],
[
"Van",
"J. Tran Thanh",
""
]
] | The energy evolution of average multiplicities of quark and gluon jets is studied in perturbative QCD. Higher order (3NLO) terms in the perturbative expansion of equations for the generating functions are found. First and second derivatives of average multiplicities are calculated. The mean multiplicity of gluon jets is larger than that of quark jets and evolves more rapidly with energy. It is shown which quantities are most sensitive to higher order perturbative and nonperturbative corrections. We define the energy regions where the corrections to different quantities are important. The latest experimental data are discussed. |
hep-ph/0001017 | Laura Mersini | L.Mersini | Radion Potential and Brane Dynamics | 16 pages, 3 figures,extraneous sentences removed, 2 footnotes added,
some typos corrected | Mod.Phys.Lett. A16 (2001) 1583-1596 | 10.1142/S0217732301004911 | Wisc-Milw-99Th-15 | hep-ph gr-qc hep-th | null | We examine the cosmology of the Randall-Sundrum model in a dynamic setting
where scalar fields are present in the bulk as well as the branes. This
generates a mechanism similar to that of Goldberger-Wise for radion
stabilization and the recovery of late-cosmology features in the branes. Due to
the induced radion dynamics, the inflating branes roll towards the minimum of
the radion potential, thereby exiting inflation and reheating the Universe. In
the slow roll part of the potential, the 'TeV' branes have maximum inflation
rate and energy as their coupling to the radion and bulk modes have minimum
suppresion. Hence, when rolling down the steep end of the potential towards the
stable point, the radion field (which appears as the inflaton of the effective
4D theory in the branes) decays very fast, reheats the Universe .This process
results decayin a decrease of brane's canonical vacuum energy $\Lambda_4$.
However, at the minimum of the potential $\Lambda_4$ is small but not
neccessarily zero and the fine-tuning issue remains .Density perturbation
constraints introduce an upper bound when the radion stabilizies. Due to the
large radion mass and strong suppression to the bulk modes, moduli problems and
bulk reheating do not occur. The reheat temperature and a sufficient number of
e-folding constraints for the brane-universe are also satisfied. The model
therefore recovers the radiation dominated FRW universe.
| [
{
"created": "Mon, 3 Jan 2000 18:29:00 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Aug 2001 17:28:50 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Mersini",
"L.",
""
]
] | We examine the cosmology of the Randall-Sundrum model in a dynamic setting where scalar fields are present in the bulk as well as the branes. This generates a mechanism similar to that of Goldberger-Wise for radion stabilization and the recovery of late-cosmology features in the branes. Due to the induced radion dynamics, the inflating branes roll towards the minimum of the radion potential, thereby exiting inflation and reheating the Universe. In the slow roll part of the potential, the 'TeV' branes have maximum inflation rate and energy as their coupling to the radion and bulk modes have minimum suppresion. Hence, when rolling down the steep end of the potential towards the stable point, the radion field (which appears as the inflaton of the effective 4D theory in the branes) decays very fast, reheats the Universe .This process results decayin a decrease of brane's canonical vacuum energy $\Lambda_4$. However, at the minimum of the potential $\Lambda_4$ is small but not neccessarily zero and the fine-tuning issue remains .Density perturbation constraints introduce an upper bound when the radion stabilizies. Due to the large radion mass and strong suppression to the bulk modes, moduli problems and bulk reheating do not occur. The reheat temperature and a sufficient number of e-folding constraints for the brane-universe are also satisfied. The model therefore recovers the radiation dominated FRW universe. |
1302.3794 | Kingman Cheung | Kingman Cheung, Jae Sik Lee, and Po-Yan Tseng | Higgs Precision (Higgcision) Era begins | 48 pages, including 7 tables and 11 figures; in this revision we have
updated the analysis using the most updated Higgs data after Moriond 2013;
because of the change in CMS diphoton data, the fits change dramatically; we
show the fits BEFORE and AFTER the Moriond update; references added | null | 10.1007/JHEP05(2013)134 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After the discovery of the Higgs boson at the LHC, it is natural to start the
research program on the precision study of the Higgs-boson couplings to various
standard model (SM) particles. We provide a generic framework for the
deviations of the couplings from their SM values by introducing a number of
parameters. We show that a large number of models beyond the SM can be covered,
including two-Higgs-doublet models, supersymmetric models, little-Higgs models,
extended Higgs sectors with singlets, and fourth generation models. We perform
global fits to the most updated data from CMS, ATLAS, and Tevatron under
various initial conditions of the parameter set. In particular, we have made
explicit comparisons between the fitting results BEFORE and AFTER the Moriond
2013 meetings. Highlights of the results include: (i) the nonstandard decay
branching ratio of the Higgs boson is less than 22%; (ii) the most efficient
way to achieve the best fit for the data before the Moriond update is to
introduce additional particle contributions to the triangular-loop functions of
H\gamma\gamma and Hgg vertices; (iii) the 1\sigma allowed range of the relative
coupling of HVV is 1.01 +0.13 -0.14, which means that the electroweak-symmetry
breaking contribution from the observed Higgs boson leaves only a small room
for other Higgs bosons; (iv) the current data do not rule out pseudoscalar
couplings nor pseudoscalar contributions to the H\gamma\gamma and Hgg vertices;
and (v) the SM Higgs boson provides the best fit to all the current Higgs data.
| [
{
"created": "Fri, 15 Feb 2013 16:21:27 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Apr 2013 07:14:43 GMT",
"version": "v2"
}
] | 2015-06-15 | [
[
"Cheung",
"Kingman",
""
],
[
"Lee",
"Jae Sik",
""
],
[
"Tseng",
"Po-Yan",
""
]
] | After the discovery of the Higgs boson at the LHC, it is natural to start the research program on the precision study of the Higgs-boson couplings to various standard model (SM) particles. We provide a generic framework for the deviations of the couplings from their SM values by introducing a number of parameters. We show that a large number of models beyond the SM can be covered, including two-Higgs-doublet models, supersymmetric models, little-Higgs models, extended Higgs sectors with singlets, and fourth generation models. We perform global fits to the most updated data from CMS, ATLAS, and Tevatron under various initial conditions of the parameter set. In particular, we have made explicit comparisons between the fitting results BEFORE and AFTER the Moriond 2013 meetings. Highlights of the results include: (i) the nonstandard decay branching ratio of the Higgs boson is less than 22%; (ii) the most efficient way to achieve the best fit for the data before the Moriond update is to introduce additional particle contributions to the triangular-loop functions of H\gamma\gamma and Hgg vertices; (iii) the 1\sigma allowed range of the relative coupling of HVV is 1.01 +0.13 -0.14, which means that the electroweak-symmetry breaking contribution from the observed Higgs boson leaves only a small room for other Higgs bosons; (iv) the current data do not rule out pseudoscalar couplings nor pseudoscalar contributions to the H\gamma\gamma and Hgg vertices; and (v) the SM Higgs boson provides the best fit to all the current Higgs data. |
hep-ph/0102233 | Dmitry Bardin | D. Bardin, P. Christova, L. Kalinovskaya and Giampiero Passarino | Atomic Parity-Violation and Precision Physics | 9 Latex | Eur.Phys.J.C22:99-104,2001 | 10.1007/s100520100773 | null | hep-ph | null | The atomic parity-violation (APV) parameter QW for a nucleus with `n'
neutrons and `z' protons has been included in the list of pseudo-observables
accessible with the codes TOPAZ0 and ZFITTER. In this way one can add the APV
results in the LEP EWWG `global' electroweak fits, checking the corresponding
effect when added to the existing precision measurements.
| [
{
"created": "Mon, 19 Feb 2001 12:52:06 GMT",
"version": "v1"
}
] | 2009-01-07 | [
[
"Bardin",
"D.",
""
],
[
"Christova",
"P.",
""
],
[
"Kalinovskaya",
"L.",
""
],
[
"Passarino",
"Giampiero",
""
]
] | The atomic parity-violation (APV) parameter QW for a nucleus with `n' neutrons and `z' protons has been included in the list of pseudo-observables accessible with the codes TOPAZ0 and ZFITTER. In this way one can add the APV results in the LEP EWWG `global' electroweak fits, checking the corresponding effect when added to the existing precision measurements. |
hep-ph/0010252 | Anton Rebhan | A. Rebhan | Improved Resummations for the Thermodynamics of the Quark-Gluon Plasma | 5 pages, 3 postscript figures, to appear in the Proceedings of
SEWM2000, Marseille, June 14-17, 2000 | null | 10.1142/9789812799913_0023 | TUW-00/27 | hep-ph | null | Two recent attempts for overcoming the poor convergence of the perturbation
expansion of the thermodynamic potentials of QCD are discussed: an HTL-adaption
of ``screened perturbation theory'' and approximately self-consistent HTL
resummations in the two-loop entropy.
| [
{
"created": "Sat, 21 Oct 2000 10:02:00 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Rebhan",
"A.",
""
]
] | Two recent attempts for overcoming the poor convergence of the perturbation expansion of the thermodynamic potentials of QCD are discussed: an HTL-adaption of ``screened perturbation theory'' and approximately self-consistent HTL resummations in the two-loop entropy. |
2302.00008 | Weishuang Linda Xu | Aditya Parikh, Juri Smirnov, Weishuang Linda Xu, and Bei Zhou | Scalar Co-SIMP Dark Matter: Models and Sensitivities | 42 pages, 10 figures | J. High Energ. Phys. 2023, 91 (2023) | 10.1007/JHEP08(2023)091 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | In this work, we present UV completions of the recently proposed
number-changing Co-SIMP freeze-out mechanism. In contrast to the standard
cannibalistic-type dark matter picture that occurs entirely in the dark sector,
the $3\to 2$ process setting the relic abundance in this case requires one
Standard Model particle in the initial and final states. This prevents the dark
sector from overheating and leads to rich experimental signatures. We generate
the Co-SIMP interaction with a dark sector consisting of two scalars, with the
mediator coupling to either nucleons or electrons. In either case, \textit{the
dark matter candidate is naturally light}: nucleophilic interactions favor the
sub-GeV mass range and leptophilic interactions favor the sub-MeV mass range.
Viable thermal models in these lighter mass regimes are particularly intriguing
to study at this time, as new developments in low-threshold detector
technologies will begin probing this region of parameter space. While particles
in the sub-MeV regime can potentially impact light element formation and CMB
decoupling, we show that a late-time phase transition opens up large fractions
of parameter space. These thermal light dark matter models can instead be
tested with dedicated experiments. We discuss the viable parameter space in
each scenario in light of the current sensitivity of various experimental
probes and projected future reach.
| [
{
"created": "Tue, 31 Jan 2023 19:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Aug 2023 21:27:00 GMT",
"version": "v2"
}
] | 2023-08-28 | [
[
"Parikh",
"Aditya",
""
],
[
"Smirnov",
"Juri",
""
],
[
"Xu",
"Weishuang Linda",
""
],
[
"Zhou",
"Bei",
""
]
] | In this work, we present UV completions of the recently proposed number-changing Co-SIMP freeze-out mechanism. In contrast to the standard cannibalistic-type dark matter picture that occurs entirely in the dark sector, the $3\to 2$ process setting the relic abundance in this case requires one Standard Model particle in the initial and final states. This prevents the dark sector from overheating and leads to rich experimental signatures. We generate the Co-SIMP interaction with a dark sector consisting of two scalars, with the mediator coupling to either nucleons or electrons. In either case, \textit{the dark matter candidate is naturally light}: nucleophilic interactions favor the sub-GeV mass range and leptophilic interactions favor the sub-MeV mass range. Viable thermal models in these lighter mass regimes are particularly intriguing to study at this time, as new developments in low-threshold detector technologies will begin probing this region of parameter space. While particles in the sub-MeV regime can potentially impact light element formation and CMB decoupling, we show that a late-time phase transition opens up large fractions of parameter space. These thermal light dark matter models can instead be tested with dedicated experiments. We discuss the viable parameter space in each scenario in light of the current sensitivity of various experimental probes and projected future reach. |
2304.05190 | Raghunath Sahoo | Kshitish Kumar Pradhan, Bhagyarathi Sahoo, Dushmanta Sahu, and
Raghunath Sahoo | Thermodynamics of a rotating hadron resonance gas with van der Waals
interaction | 11 pages and 6 captioned figures. Submitted for publication | null | null | null | hep-ph hep-ex nucl-ex nucl-th | http://creativecommons.org/licenses/by-sa/4.0/ | Studying the thermodynamics of the systems produced in ultra-relativistic
heavy-ion collisions is crucial in understanding the QCD phase diagram.
Recently, a new avenue has opened regarding the implications of large initial
angular momentum and subsequent vorticity in the medium evolution in
high-energy collisions. This adds a new type of chemical potential into the
partonic and hadronic systems, called the rotational chemical potential. We
study the thermodynamics of an interacting hadronic matter under rotation,
formed in an ultra-relativistic collision. We introduce attractive and
repulsive interactions through the van der Waals equation of state.
Thermodynamic properties like the pressure ($P$), energy density
($\varepsilon$), entropy density ($s$), trace anomaly ($(\varepsilon -
3P)/T^{4}$), specific heat ($c_{\rm v}$) and squared speed of sound ($c_{\rm
s}^{2}$) are studied as functions of temperature ($T$) for zero and finite
rotation chemical potential. The charge fluctuations, which can be quantified
by their respective susceptibilities, are also studied. The rotational (spin)
density corresponding to the rotational chemical potential is explored. In
addition, we explore the possible liquid-gas phase transition in the hadron gas
with van der Waals interaction in the $T$ -- $\omega$ phase space.
| [
{
"created": "Tue, 11 Apr 2023 12:49:56 GMT",
"version": "v1"
}
] | 2023-04-12 | [
[
"Pradhan",
"Kshitish Kumar",
""
],
[
"Sahoo",
"Bhagyarathi",
""
],
[
"Sahu",
"Dushmanta",
""
],
[
"Sahoo",
"Raghunath",
""
]
] | Studying the thermodynamics of the systems produced in ultra-relativistic heavy-ion collisions is crucial in understanding the QCD phase diagram. Recently, a new avenue has opened regarding the implications of large initial angular momentum and subsequent vorticity in the medium evolution in high-energy collisions. This adds a new type of chemical potential into the partonic and hadronic systems, called the rotational chemical potential. We study the thermodynamics of an interacting hadronic matter under rotation, formed in an ultra-relativistic collision. We introduce attractive and repulsive interactions through the van der Waals equation of state. Thermodynamic properties like the pressure ($P$), energy density ($\varepsilon$), entropy density ($s$), trace anomaly ($(\varepsilon - 3P)/T^{4}$), specific heat ($c_{\rm v}$) and squared speed of sound ($c_{\rm s}^{2}$) are studied as functions of temperature ($T$) for zero and finite rotation chemical potential. The charge fluctuations, which can be quantified by their respective susceptibilities, are also studied. The rotational (spin) density corresponding to the rotational chemical potential is explored. In addition, we explore the possible liquid-gas phase transition in the hadron gas with van der Waals interaction in the $T$ -- $\omega$ phase space. |
1308.2244 | Alberto Salvio | Alberto Salvio | Higgs Inflation at NNLO after the Boson Discovery | 7 pages, 3 figures; v2: few comments added to emphasize the
importance of the results, published in Phys. Lett. B | Phys.Lett.B727:234-239,2013 | 10.1016/j.physletb.2013.10.042 | FTUAM-13-22, IFT-UAM/CSIC-13-089 | hep-ph astro-ph.CO gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain the bound on the Higgs and top masses to have Higgs inflation
(where the Higgs field is non-minimally coupled to gravity) at full
next-to-next-to-leading order (NNLO). Comparing the result obtained with the
experimental values of the relevant parameters we find some tension, which we
quantify. Higgs inflation, however, is not excluded at the moment as the
measured values of the Higgs and top masses are close enough to the bound once
experimental and theoretical uncertainties are taken into account.
| [
{
"created": "Fri, 9 Aug 2013 20:50:50 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Nov 2013 09:46:48 GMT",
"version": "v2"
}
] | 2013-11-07 | [
[
"Salvio",
"Alberto",
""
]
] | We obtain the bound on the Higgs and top masses to have Higgs inflation (where the Higgs field is non-minimally coupled to gravity) at full next-to-next-to-leading order (NNLO). Comparing the result obtained with the experimental values of the relevant parameters we find some tension, which we quantify. Higgs inflation, however, is not excluded at the moment as the measured values of the Higgs and top masses are close enough to the bound once experimental and theoretical uncertainties are taken into account. |
1111.0769 | Thorsten Renk | Thorsten Renk | Jets in medium - what RHIC and LHC measurements of R_AA and I_AA can
teach about the parton-medium interaction | 4 pages, 1 figure, talk given at the XLI International Symposium of
Multiparticle Dynamics, 26-30 September 2011, Miyajima, Hiroshima, Japan | null | 10.1143/PTPS.193.101 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | High P_T observables associated with hard pQCD processes are regarded as
tomographic probes of the medium created in ultrarelativistic heavy-ion
collisions. Unfortunately, tomography is unexpectedly complicated in practice
due to model uncertainties and the highly averaged nature of many observables.
However, a systematic comparison study demanding a simultaneous description of
many observables within the same framework is sufficiently powerful to rule out
a large fraction of conjectured models about the physics mechanism of
parton-medium interaction. From this study, it can be inferred that the
relevant mechanism is likely to be perturbatively tractable medium-induced
radiation with a small component of elastic energy transfer into the medium.
| [
{
"created": "Thu, 3 Nov 2011 10:03:24 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Renk",
"Thorsten",
""
]
] | High P_T observables associated with hard pQCD processes are regarded as tomographic probes of the medium created in ultrarelativistic heavy-ion collisions. Unfortunately, tomography is unexpectedly complicated in practice due to model uncertainties and the highly averaged nature of many observables. However, a systematic comparison study demanding a simultaneous description of many observables within the same framework is sufficiently powerful to rule out a large fraction of conjectured models about the physics mechanism of parton-medium interaction. From this study, it can be inferred that the relevant mechanism is likely to be perturbatively tractable medium-induced radiation with a small component of elastic energy transfer into the medium. |
2310.19328 | Artem Lipatov | S.P. Baranov, A.V. Lipatov, A.A. Prokhorov, X. Chen | Towards higher-order calculations of quarkonia production with
$k_T$-factorization: $P$-wave charmonia | 23 pages, 11 figures, 1 table | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Inclusive $P$-wave charmonia production in hadronic collisions at high
energies is discussed in the framework of non-relativistic QCD and
$k_T$-factorization formalism. We present two consistent approches to merge the
usual leading order $k_T$-factorization calculations with tree-level
next-to-leading order off-shell amplitudes. Using these prescriptions, we
extracted long-distance matrix elements for $\chi_c$ mesons from a combined fit
to available Tevatron and LHC data. In contrast to previous (leading order)
calculations, our fits do not contradict equal color singlet wave functions of
$\chi_{c1}$ and $\chi_{c2}$ states. The extracted values of long-distance
matrix elements are employed to analyse the $\chi_c$ polarization data reported
recently by the CMS Collaboration. Our predictions are in a reasonably good
agreement with the Tevatron and LHC measurements within the theoretical and
experimental uncertainties.
| [
{
"created": "Mon, 30 Oct 2023 07:57:21 GMT",
"version": "v1"
}
] | 2023-10-31 | [
[
"Baranov",
"S. P.",
""
],
[
"Lipatov",
"A. V.",
""
],
[
"Prokhorov",
"A. A.",
""
],
[
"Chen",
"X.",
""
]
] | Inclusive $P$-wave charmonia production in hadronic collisions at high energies is discussed in the framework of non-relativistic QCD and $k_T$-factorization formalism. We present two consistent approches to merge the usual leading order $k_T$-factorization calculations with tree-level next-to-leading order off-shell amplitudes. Using these prescriptions, we extracted long-distance matrix elements for $\chi_c$ mesons from a combined fit to available Tevatron and LHC data. In contrast to previous (leading order) calculations, our fits do not contradict equal color singlet wave functions of $\chi_{c1}$ and $\chi_{c2}$ states. The extracted values of long-distance matrix elements are employed to analyse the $\chi_c$ polarization data reported recently by the CMS Collaboration. Our predictions are in a reasonably good agreement with the Tevatron and LHC measurements within the theoretical and experimental uncertainties. |
1112.4030 | Yu-Feng Zhou | Ze-Peng Liu, Yue-Liang Wu and Yu-Feng Zhou | Dark matter conversion as a source of boost factor for explaining the
cosmic ray positron and electron excesses | 7 pages, 1 figure. Talk given at the 7th international workshop on
the dark side of the Universe (DSU2011), Sept.26-30, KITPC/ITP, Beijing. To
be published in proceedings | null | 10.1088/1742-6596/384/1/012024 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In interacting multi-component dark matter (DM) models, if the DM components
are nearly degenerate in mass and the interactions between them are strong
enough, the relatively heavy DM components can be converted into lighter ones
at late time after the thermal decoupling. Consequently, the relic density of
the lightest DM component can be considerably enhanced at late time. This may
contribute to an alternative source of boost factor required to explain the
positron and electron excesses reported by the recent DM indirect search
experiments such as PAMELA, Fermi-LAT and HESS etc..
| [
{
"created": "Sat, 17 Dec 2011 06:13:20 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Liu",
"Ze-Peng",
""
],
[
"Wu",
"Yue-Liang",
""
],
[
"Zhou",
"Yu-Feng",
""
]
] | In interacting multi-component dark matter (DM) models, if the DM components are nearly degenerate in mass and the interactions between them are strong enough, the relatively heavy DM components can be converted into lighter ones at late time after the thermal decoupling. Consequently, the relic density of the lightest DM component can be considerably enhanced at late time. This may contribute to an alternative source of boost factor required to explain the positron and electron excesses reported by the recent DM indirect search experiments such as PAMELA, Fermi-LAT and HESS etc.. |
hep-ph/9910323 | Yu | Yu Zeng-Hui (1,3), Herbert. Pietschmann (1), Ma Wen-Gan (2,3), Han
Liang (3), Jiang Yi (3) ((1)Institut fur Theoretische Physik, Universitat
Wien, (2)CCAST (World Laboratory), Beijing, P.R.China, (3)Department of
Modern Physics, University of Science and Technology of China (USTC), Hefei,
Anhui P.R.China) | Probing R-parity violation in the production of $t \bar{c}(c \bar{t})$
on the lepton colliders | 16 pages, 4 figures | null | null | UWThPh-1999-64 | hep-ph | null | We studied the process $e^{+}e^{-} \to t\bar{c}+c\bar{t}$ in a R_{p}
violating supersymmetric model with effects from both B- and L-violating
interactions. The calculation shows that it is possible to either detect the
R_{p} violating signal at the Next Linear Collider or get more stringent
constraints on the heavy-flavor $\rlap/R_{p}$ couplings. A comparision with
results from $\gamma\gamma \to t\bar{c}+ c\bar{t}$ may allow to distinguish
between B- and L-violating interactions. For very clean background conditions
and R_{p} violation parameters close to present limits, a future detection of
B-violating interactions should be possible. The process of $\mu ^{+} \mu ^{-}
\to t \bar{c}+c\bar{t}$ is also considered.
| [
{
"created": "Wed, 13 Oct 1999 11:52:22 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Nov 1999 10:09:09 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Zeng-Hui",
"Yu",
""
],
[
"Pietschmann",
"Herbert.",
""
],
[
"Wen-Gan",
"Ma",
""
],
[
"Liang",
"Han",
""
],
[
"Yi",
"Jiang",
""
]
] | We studied the process $e^{+}e^{-} \to t\bar{c}+c\bar{t}$ in a R_{p} violating supersymmetric model with effects from both B- and L-violating interactions. The calculation shows that it is possible to either detect the R_{p} violating signal at the Next Linear Collider or get more stringent constraints on the heavy-flavor $\rlap/R_{p}$ couplings. A comparision with results from $\gamma\gamma \to t\bar{c}+ c\bar{t}$ may allow to distinguish between B- and L-violating interactions. For very clean background conditions and R_{p} violation parameters close to present limits, a future detection of B-violating interactions should be possible. The process of $\mu ^{+} \mu ^{-} \to t \bar{c}+c\bar{t}$ is also considered. |
1312.7809 | Olga Voskresenskaya | Eduard Kuraev, Olga Voskresenskaya, and Alexander Tarasov | Coulomb Corrections to the Parameters of the Moliere Multiple Scattering
Theory | LaTeX, 8 pages, 1 Table, and 1 Figure; v2: Table 1 is complemented.
arXiv admin note: text overlap with arXiv:1211.6961 | Phys. Rev. D 89, 116016 (2014) | 10.1103/PhysRevD.89.116016 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | High-energy Coulomb corrections to the parameters of the Moliere multiple
scattering theory are obtained. Numerical calculations are presented in the
range of the nuclear charge number of the target atom 4<Z<95. It is shown that
these corrections have a large value for sufficiently heavy elements of the
target material and should be taken into account in describing high-energy
experiments with nuclear targets.
| [
{
"created": "Mon, 30 Dec 2013 18:24:33 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jan 2014 13:32:40 GMT",
"version": "v2"
}
] | 2014-07-02 | [
[
"Kuraev",
"Eduard",
""
],
[
"Voskresenskaya",
"Olga",
""
],
[
"Tarasov",
"Alexander",
""
]
] | High-energy Coulomb corrections to the parameters of the Moliere multiple scattering theory are obtained. Numerical calculations are presented in the range of the nuclear charge number of the target atom 4<Z<95. It is shown that these corrections have a large value for sufficiently heavy elements of the target material and should be taken into account in describing high-energy experiments with nuclear targets. |
hep-ph/9611222 | Bingsong Zou | D.V. Bugg and B.S. Zou (Queen Mary and Westfield College, London) | A new view of the 0- and 2+ glueballs | 15 pages + 3 postscript figures | Phys.Lett. B396 (1997) 295-300 | 10.1016/S0370-2693(97)00091-9 | null | hep-ph | null | Data on $J/\Psi \to \gamma (\rho\rho)$ demand a broad $0^-$ $\rho\rho$
signal, attributable to a glueball with a mass of 1750--2100 MeV. Decays of
this broad state to $\rho\rho$, $\omega\omega$, $K^*\bar K^*$ and $\phi \phi$
channels agree well with flavour blindness. The narrow $\iota(1440)$ may be
attributed to mixing between the glueball and the $s\bar s$ radial excitation.
The latter is pushed down in mass by repulsion between the two levels. We
conjecture that the $2^+$ glueball may likewise be broad. Mixing between it and
the $2^3P_2~q\bar q$ and $s\bar s$ radial excitation can explain the appearance
of $f_2(1565)$ and a $2^+$ $\Theta (1710)$ at masses lower than anticipated.
Mixing with higher $q\bar q$ states can explain the $2^+$ resonance at 1920 MeV
and also $\phi \phi$ signals observed by Etkin et al. and by the JETSET
collaboration.
| [
{
"created": "Mon, 4 Nov 1996 10:06:34 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Bugg",
"D. V.",
"",
"Queen Mary and Westfield College, London"
],
[
"Zou",
"B. S.",
"",
"Queen Mary and Westfield College, London"
]
] | Data on $J/\Psi \to \gamma (\rho\rho)$ demand a broad $0^-$ $\rho\rho$ signal, attributable to a glueball with a mass of 1750--2100 MeV. Decays of this broad state to $\rho\rho$, $\omega\omega$, $K^*\bar K^*$ and $\phi \phi$ channels agree well with flavour blindness. The narrow $\iota(1440)$ may be attributed to mixing between the glueball and the $s\bar s$ radial excitation. The latter is pushed down in mass by repulsion between the two levels. We conjecture that the $2^+$ glueball may likewise be broad. Mixing between it and the $2^3P_2~q\bar q$ and $s\bar s$ radial excitation can explain the appearance of $f_2(1565)$ and a $2^+$ $\Theta (1710)$ at masses lower than anticipated. Mixing with higher $q\bar q$ states can explain the $2^+$ resonance at 1920 MeV and also $\phi \phi$ signals observed by Etkin et al. and by the JETSET collaboration. |
hep-ph/9501208 | Igor Dremin | I.M. DREMIN | QCD EQUATIONS FOR GENERATING FUNCTIONALS AND MULTIPARTICLE CORRELATIONS | 8 pages, latex, no Figs; latex error corrected in new version | Phys.Atom.Nucl. 58 (1995) 1778-1781; Yad.Fiz. 58 (1995) 1880-1883 | null | TD 95/01, submitted to Yadernaya Fizika (J. At. Nucl.) | hep-ph | null | QCD equations for generating functionals are solved at coinciding momenta of
particles. As a result, the relations for $q$-particle correlation functions at
equal momenta are obtained. They are directly connected to previously derived
results about the factorial and cumulant moments of multiplicity distributions.
It is predicted that the correlations at coinciding points decrease, first, as
a function of the rank $q$, and then start oscillating when represented in a
form of the ratio of cumulant to factorial correlations. In particular, the
cumulant function of the fifth rank should become negative at the origin. Some
experimental data are discussed.
| [
{
"created": "Wed, 4 Jan 1995 10:50:52 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Jan 1995 10:07:11 GMT",
"version": "v2"
}
] | 2016-09-01 | [
[
"DREMIN",
"I. M.",
""
]
] | QCD equations for generating functionals are solved at coinciding momenta of particles. As a result, the relations for $q$-particle correlation functions at equal momenta are obtained. They are directly connected to previously derived results about the factorial and cumulant moments of multiplicity distributions. It is predicted that the correlations at coinciding points decrease, first, as a function of the rank $q$, and then start oscillating when represented in a form of the ratio of cumulant to factorial correlations. In particular, the cumulant function of the fifth rank should become negative at the origin. Some experimental data are discussed. |
1212.1425 | James Unwin | James Unwin | Exodus: Hidden origin of dark matter and baryons | 20 pages. v2: Appendix added, published version | null | 10.1007/JHEP06(2013)090 | OUTP-12-21P | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new framework for explaining the proximity of the baryon and
dark matter relic densities \Omega_{DM} \approx 5\Omega_B. The scenario assumes
that the number density of the observed dark matter states is generated due to
decays from a second hidden sector which simultaneously generates the baryon
asymmetry. In contrast to asymmetric dark matter models, the dark matter can be
a real scalar or Majorana fermion and thus presents distinct phenomenology. We
discuss aspects of model building and general constraints in this framework. We
present a simple supersymmetric implementation of this mechanism and show that
it can be used to obtain the correct dark matter relic density for a bino LSP.
| [
{
"created": "Thu, 6 Dec 2012 19:41:51 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Jul 2014 02:43:45 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Unwin",
"James",
""
]
] | We propose a new framework for explaining the proximity of the baryon and dark matter relic densities \Omega_{DM} \approx 5\Omega_B. The scenario assumes that the number density of the observed dark matter states is generated due to decays from a second hidden sector which simultaneously generates the baryon asymmetry. In contrast to asymmetric dark matter models, the dark matter can be a real scalar or Majorana fermion and thus presents distinct phenomenology. We discuss aspects of model building and general constraints in this framework. We present a simple supersymmetric implementation of this mechanism and show that it can be used to obtain the correct dark matter relic density for a bino LSP. |
1012.4490 | Farvah Mahmoudi | F. Mahmoudi, J. Rathsman, O. St{\aa}l, L. Zeune | Light Higgs bosons in phenomenological NMSSM | 35 pages, 17 figures | Eur. Phys. J. C 71 (2011) 1608 | 10.1140/epjc/s10052-011-1608-3 | CERN-PH-TH/2010-304, DESY 10-246, LU-TP 10-29 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider scenarios in the next-to-minimal supersymmetric model (NMSSM)
where the CP-odd and charged Higgs bosons are very light. As we demonstrate,
these can be obtained as simple deformations of existing phenomenological MSSM
benchmarks scenarios with parameters defined at the weak scale. This offers a
direct and meaningful comparison to the MSSM case. Applying a wide set of
up-to-date constraints from both high-energy collider and flavour physics, the
Higgs boson masses and couplings are studied in viable parts of parameter
space. The LHC phenomenology of the light Higgs scenario for neutral and
charged Higgs boson searches is discussed.
| [
{
"created": "Mon, 20 Dec 2010 22:01:39 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Apr 2011 16:10:11 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Mahmoudi",
"F.",
""
],
[
"Rathsman",
"J.",
""
],
[
"Stål",
"O.",
""
],
[
"Zeune",
"L.",
""
]
] | We consider scenarios in the next-to-minimal supersymmetric model (NMSSM) where the CP-odd and charged Higgs bosons are very light. As we demonstrate, these can be obtained as simple deformations of existing phenomenological MSSM benchmarks scenarios with parameters defined at the weak scale. This offers a direct and meaningful comparison to the MSSM case. Applying a wide set of up-to-date constraints from both high-energy collider and flavour physics, the Higgs boson masses and couplings are studied in viable parts of parameter space. The LHC phenomenology of the light Higgs scenario for neutral and charged Higgs boson searches is discussed. |
hep-ph/0004237 | Carlos Merino Gayoso | A.B. Kaidalov (ITEP-Moscow), C. Merino (U. of Santiago de Compostela),
D. Pertermann (U. GH-Siegen) | On the Behavior of F2 and its Logarithmic Slopes | 16 pages, 10 figures | Eur.Phys.J.C20:301-311,2001 | 10.1007/s100520100648 | null | hep-ph | null | It is shown that the CKMT model for the nucleon structure function F2, taken
as the initial condition for the NLO evolution equations in perturbative QCD,
provides a good description of the HERA data when presented in the form of the
logarithmic slopes of F2 vs x and Q2 (Caldwell-plot), in the whole available
kinematic ranges. Also the results obtained for the behavior of the gluon
component of a nucleon are presented.
| [
{
"created": "Wed, 26 Apr 2000 15:33:00 GMT",
"version": "v1"
}
] | 2009-01-07 | [
[
"Kaidalov",
"A. B.",
"",
"ITEP-Moscow"
],
[
"Merino",
"C.",
"",
"U. of Santiago de Compostela"
],
[
"Pertermann",
"D.",
"",
"U. GH-Siegen"
]
] | It is shown that the CKMT model for the nucleon structure function F2, taken as the initial condition for the NLO evolution equations in perturbative QCD, provides a good description of the HERA data when presented in the form of the logarithmic slopes of F2 vs x and Q2 (Caldwell-plot), in the whole available kinematic ranges. Also the results obtained for the behavior of the gluon component of a nucleon are presented. |
1201.0309 | David Blaschke | Carlos Pena and David Blaschke | X(3872) as a D-D* molecule bound by quark exchange forces | 6 pages, 3 figures, contribution to the Proceedings of the 28th
Max-Born-Symposium on "Three days on quarkyonic island", Wroclaw, Poland, May
19-21, 2011 | Acta Phys. Pol. B Proc. Suppl. 5, 963 - 969 (2012) | 10.5506/APhysPolBSupp.5.963 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Bethe-Salpeter equation for the T-Matrix of D-D* scattering is solved
with a meson-meson potential that results from 2nd order Born approximation of
quark exchange processes. This potential turns out to be complex and energy
dependent due to the pole contribution from the coupling to the intermediate
J/psi-rho meson pair propagator. As a consequence, a bound state with a mass
close to 3.872 GeV occurs in the J/psi-rho continuum. This result suggests that
quark exchange forces may provide the solution to the puzzling question for the
origin of the interaction which leads to a binding of D and D* mesons in the
X(3872) state.
| [
{
"created": "Sat, 31 Dec 2011 21:57:31 GMT",
"version": "v1"
}
] | 2012-09-20 | [
[
"Pena",
"Carlos",
""
],
[
"Blaschke",
"David",
""
]
] | The Bethe-Salpeter equation for the T-Matrix of D-D* scattering is solved with a meson-meson potential that results from 2nd order Born approximation of quark exchange processes. This potential turns out to be complex and energy dependent due to the pole contribution from the coupling to the intermediate J/psi-rho meson pair propagator. As a consequence, a bound state with a mass close to 3.872 GeV occurs in the J/psi-rho continuum. This result suggests that quark exchange forces may provide the solution to the puzzling question for the origin of the interaction which leads to a binding of D and D* mesons in the X(3872) state. |
2102.01602 | Friederike Ihssen | Eduardo Grossi, Friederike J. Ihssen, Jan M. Pawlowski, Nicolas Wink | Shocks and quark-meson scatterings at large density | 26 pages, 16 figures | Phys. Rev. D 104, 016028 (2021) | 10.1103/PhysRevD.104.016028 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the phase structure of the two-flavour quark-meson model including
quantum, thermal, density and critical fluctuations with the functional
renormalisation group. This study combines two technical advances in the
literature, that are also chiefly important for the quantitative access of the
phase boundary of QCD at large density or baryon chemical potential.
Specifically we allow for the formation and propagation of shocks as well as a
fully self-consistent computation of the order parameter potential for chiral
symmetry breaking.
| [
{
"created": "Tue, 2 Feb 2021 16:54:29 GMT",
"version": "v1"
}
] | 2021-08-04 | [
[
"Grossi",
"Eduardo",
""
],
[
"Ihssen",
"Friederike J.",
""
],
[
"Pawlowski",
"Jan M.",
""
],
[
"Wink",
"Nicolas",
""
]
] | We discuss the phase structure of the two-flavour quark-meson model including quantum, thermal, density and critical fluctuations with the functional renormalisation group. This study combines two technical advances in the literature, that are also chiefly important for the quantitative access of the phase boundary of QCD at large density or baryon chemical potential. Specifically we allow for the formation and propagation of shocks as well as a fully self-consistent computation of the order parameter potential for chiral symmetry breaking. |
1702.04730 | Christopher McCabe | Christopher McCabe | New constraints and discovery potential of sub-GeV dark matter with
xenon detectors | v2: Updated to match journal version. Additional technical
information provided in appendices. 11 pages, 7 figures | Phys. Rev. D 96, 043010 (2017) | 10.1103/PhysRevD.96.043010 | KCL-PH-TH/2017-16 | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Existing xenon dark matter (DM) direct detection experiments can probe the
DM-nucleon interaction of DM with a sub-GeV mass through a search for photon
emission from the recoiling xenon atom. We show that LUX's constraints on
sub-GeV DM, which utilise the scintillation (S1) and ionisation (S2) signals,
are approximately three orders of magnitude more stringent than previous xenon
constraints in this mass range, derived from the XENON10 and XENON100 S2-only
searches. The new LUX constraints provide the most stringent direct detection
constraints for DM particles with a mass below 0.5 GeV. In addition, the photon
emission signal in LUX and its successor LZ maintain the discrimination between
background and signal events so that an unambiguous discovery of sub-GeV DM is
possible. We show that LZ has the potential to reconstruct the DM mass with 20%
accuracy for particles lighter than 0.5 GeV.
| [
{
"created": "Wed, 15 Feb 2017 19:00:09 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Aug 2017 11:28:31 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"McCabe",
"Christopher",
""
]
] | Existing xenon dark matter (DM) direct detection experiments can probe the DM-nucleon interaction of DM with a sub-GeV mass through a search for photon emission from the recoiling xenon atom. We show that LUX's constraints on sub-GeV DM, which utilise the scintillation (S1) and ionisation (S2) signals, are approximately three orders of magnitude more stringent than previous xenon constraints in this mass range, derived from the XENON10 and XENON100 S2-only searches. The new LUX constraints provide the most stringent direct detection constraints for DM particles with a mass below 0.5 GeV. In addition, the photon emission signal in LUX and its successor LZ maintain the discrimination between background and signal events so that an unambiguous discovery of sub-GeV DM is possible. We show that LZ has the potential to reconstruct the DM mass with 20% accuracy for particles lighter than 0.5 GeV. |
1107.0469 | Sergey Alekhin | S. Alekhin, S.-O. Moch | Running heavy-quark masses in DIS | To appear in the proceedings of 19th International Workshop on Deep
Inelastic Scattering and Related Subjects (DIS 2011), Newport News
(Virginia), 10-15 Apr 2011 | null | null | DESY 11-113 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on determinations of the running mass for charm quarks from
deep-inelastic scattering reactions. The method provides complementary
information on this fundamental parameter from hadronic processes with
space-like kinematics. The obtained values are consistent with but
systematically lower than the world average as published by the PDG. We also
address the consequences of the running mass scheme for heavy-quark parton
distributions in global fits to deep-inelastic scattering data.
| [
{
"created": "Sun, 3 Jul 2011 16:09:40 GMT",
"version": "v1"
}
] | 2011-07-05 | [
[
"Alekhin",
"S.",
""
],
[
"Moch",
"S. -O.",
""
]
] | We report on determinations of the running mass for charm quarks from deep-inelastic scattering reactions. The method provides complementary information on this fundamental parameter from hadronic processes with space-like kinematics. The obtained values are consistent with but systematically lower than the world average as published by the PDG. We also address the consequences of the running mass scheme for heavy-quark parton distributions in global fits to deep-inelastic scattering data. |
1212.0444 | Helen Matskevich | S. M. Gerasyuta and E. E. Matskevich | Nonstrange baryonia with the open charm | 3 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The relativistic six-quark amplitudes of the nonstrange baryonia with the
open charm are calculated. The poles of these amplitudes determine the masses
of baryonia. 9 masses of baryonia are predicted.
| [
{
"created": "Mon, 3 Dec 2012 16:44:57 GMT",
"version": "v1"
}
] | 2012-12-04 | [
[
"Gerasyuta",
"S. M.",
""
],
[
"Matskevich",
"E. E.",
""
]
] | The relativistic six-quark amplitudes of the nonstrange baryonia with the open charm are calculated. The poles of these amplitudes determine the masses of baryonia. 9 masses of baryonia are predicted. |
1503.07450 | Yang Bai | Thomas Appelquist, Yang Bai and Maurizio Piai | Constrained Flavor Breaking | 8 pages, 2 figures; accepted version for PRD | Phys. Rev. D 91, 093009 (2015) | 10.1103/PhysRevD.91.093009 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore predictive flavor models based on subgroups of the standard-model
$SU(3)^5$ flavor symmetry. Restricting to products of $SU(3)$, we find that a
global $SU(3)^3$ flavor symmetry, broken only by two Yukawa spurions, leads to
a relation among down-type quark, up-type quark and charged-lepton Yukawa
matrices: $Y_d \propto Y_u Y_e^\dagger$. As a result, the charged-lepton mass
ratios are expressed in terms of quark mass ratios and mixing angles. Large
leptonic mixing angles appear to be natural and lead to contributions to
flavor-changing neutral currents in the charged-lepton sector, which can be
tested in future precision experiments.
| [
{
"created": "Wed, 25 Mar 2015 16:39:04 GMT",
"version": "v1"
},
{
"created": "Fri, 1 May 2015 14:12:06 GMT",
"version": "v2"
}
] | 2015-05-27 | [
[
"Appelquist",
"Thomas",
""
],
[
"Bai",
"Yang",
""
],
[
"Piai",
"Maurizio",
""
]
] | We explore predictive flavor models based on subgroups of the standard-model $SU(3)^5$ flavor symmetry. Restricting to products of $SU(3)$, we find that a global $SU(3)^3$ flavor symmetry, broken only by two Yukawa spurions, leads to a relation among down-type quark, up-type quark and charged-lepton Yukawa matrices: $Y_d \propto Y_u Y_e^\dagger$. As a result, the charged-lepton mass ratios are expressed in terms of quark mass ratios and mixing angles. Large leptonic mixing angles appear to be natural and lead to contributions to flavor-changing neutral currents in the charged-lepton sector, which can be tested in future precision experiments. |
1409.0922 | Andreas Crivellin | Andreas Crivellin | Challenges for New Physics in the Flavour Sector | Presented at the 2014 Flavour Physics and CP Violation (FPCP-2014),
Marseille, France, May 26-30 2014, 27 pages, 6 figures, references added | null | null | CERN-PH-TH-2014-166 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In these proceedings I present a personal perspective of the challenges for
new physics (NP) searches in the flavour sector. Since the CKM mechanism of
flavour violation has been established to a very high precision, we know that
physics beyond the Standard Model can only contribute sub-dominantly.
Therefore, any realistic model of physics beyond the Standard Model (SM) must
respect the stringent constrains from flavour observables like $b\to s \gamma$,
$B_s\to\mu^+\mu^-$, $\Delta F=2$ processes etc., in a first step. In a second
step, it is interesting to ask the question if some deviations from the SM
predictions (like the anomalous magnetic moment of the muon or recently
observed discrepancies in tauonic $B$ decays or $B\to K^*\mu^+\mu^-$) can be
explained by a model of NP without violating bounds from other observables.
| [
{
"created": "Tue, 2 Sep 2014 23:43:00 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Sep 2014 15:08:39 GMT",
"version": "v2"
}
] | 2014-09-12 | [
[
"Crivellin",
"Andreas",
""
]
] | In these proceedings I present a personal perspective of the challenges for new physics (NP) searches in the flavour sector. Since the CKM mechanism of flavour violation has been established to a very high precision, we know that physics beyond the Standard Model can only contribute sub-dominantly. Therefore, any realistic model of physics beyond the Standard Model (SM) must respect the stringent constrains from flavour observables like $b\to s \gamma$, $B_s\to\mu^+\mu^-$, $\Delta F=2$ processes etc., in a first step. In a second step, it is interesting to ask the question if some deviations from the SM predictions (like the anomalous magnetic moment of the muon or recently observed discrepancies in tauonic $B$ decays or $B\to K^*\mu^+\mu^-$) can be explained by a model of NP without violating bounds from other observables. |
hep-ph/0212331 | B. Kyae | Bumseok Kyae and Qaisar Shafi | Inflationary Cosmology with Five Dimensional SO(10) | 1+19 pages, improved discussion of 5D cosmology, Version to appear in
PRD | Phys.Rev.D69:046004,2004 | 10.1103/PhysRevD.69.046004 | BA-02-40 | hep-ph | null | We discuss inflationary cosmology in a five dimensional SO(10) model
compactified on $S^1/(Z_2\times Z_2')$, which yields $SU(3)_c\times
SU(2)_L\times U(1)_Y\times U(1)_X$ below the compactification scale. The gauge
symmetry $SU(5)\times U(1)_X$ is preserved on one of the fixed points, while
``flipped'' $SU(5)'\times U(1)'_X$ is on the other fixed point. Inflation is
associated with $U(1)_X$ breaking, and is implemented through $F$-term scalar
potentials on the two fixed points. A brane-localized Einstein-Hilbert term
allows both branes to have positive tensions during inflation. The scale of
$U(1)_X$ breaking is fixed from $\delta T/T$ measurements to be around
$10^{16}$ GeV, and the scalar spectral index $n=0.98-0.99$. The inflaton field
decays into right-handed neutrinos whose subsequent out of equilibrium decay
yield the observed baryon asymmetry via leptogenesis.
| [
{
"created": "Sun, 22 Dec 2002 15:39:08 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Sep 2003 19:44:50 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Jan 2004 20:34:43 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Kyae",
"Bumseok",
""
],
[
"Shafi",
"Qaisar",
""
]
] | We discuss inflationary cosmology in a five dimensional SO(10) model compactified on $S^1/(Z_2\times Z_2')$, which yields $SU(3)_c\times SU(2)_L\times U(1)_Y\times U(1)_X$ below the compactification scale. The gauge symmetry $SU(5)\times U(1)_X$ is preserved on one of the fixed points, while ``flipped'' $SU(5)'\times U(1)'_X$ is on the other fixed point. Inflation is associated with $U(1)_X$ breaking, and is implemented through $F$-term scalar potentials on the two fixed points. A brane-localized Einstein-Hilbert term allows both branes to have positive tensions during inflation. The scale of $U(1)_X$ breaking is fixed from $\delta T/T$ measurements to be around $10^{16}$ GeV, and the scalar spectral index $n=0.98-0.99$. The inflaton field decays into right-handed neutrinos whose subsequent out of equilibrium decay yield the observed baryon asymmetry via leptogenesis. |
hep-ph/9812216 | null | Biswajoy Brahmachari (Indiana U) | A See-saw model of sterile neutrino | Revised version, to appear in Phys. Lett. B | Phys.Lett. B461 (1999) 243-247 | 10.1016/S0370-2693(99)00846-1 | null | hep-ph | null | If the smallness of the mass of the sterile neutrino is to be explained by
the see-saw mechanism, the off-diagonal entries of the mass matrix needs to be
protected by some symmetry not far above the electroweak scale. We implement
see-saw mechanism in a gauge model based on $SU(2)^q_L \times SU(2)^l_L \times
U(1)^q_Y \times U(1)^l_Y$ un-unified gauge group which breaks to $SU(2)_L
\times U(1)_Y$ at the TeV region via a two-step symmetry breaking chain. The
right handed diagonal block is tied to the highest scale up to which the
un-unification symmetry holds. The sterile neutrino emerges from a quark-lepton
mixed representation of the un-unified group.
| [
{
"created": "Tue, 1 Dec 1998 19:57:10 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Jul 1999 21:02:32 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Brahmachari",
"Biswajoy",
"",
"Indiana U"
]
] | If the smallness of the mass of the sterile neutrino is to be explained by the see-saw mechanism, the off-diagonal entries of the mass matrix needs to be protected by some symmetry not far above the electroweak scale. We implement see-saw mechanism in a gauge model based on $SU(2)^q_L \times SU(2)^l_L \times U(1)^q_Y \times U(1)^l_Y$ un-unified gauge group which breaks to $SU(2)_L \times U(1)_Y$ at the TeV region via a two-step symmetry breaking chain. The right handed diagonal block is tied to the highest scale up to which the un-unification symmetry holds. The sterile neutrino emerges from a quark-lepton mixed representation of the un-unified group. |
2005.10259 | Robert D. Pisarski | Robert D. Pisarski, Alexei M. Tsvelik, and Semeon Valgushev | How transverse thermal fluctuations disorder a condensate of chiral
spirals into a quantum spin liquid | v2: added a discussion of previous work by Kleinert, ref. 10 | Phys. Rev. D 102, 016015 (2020) | 10.1103/PhysRevD.102.016015 | null | hep-ph cond-mat.stat-mech nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For a scalar theory with a global $O(N)$ symmetry, when $N=2$ a spatially
inhomogeneous condensate arises when the term in the Lagrangian with two
spatial derivatives has a negative coefficient. If the condensate for such a
chiral spiral includes only one mode, characterized by a momentum $k_0
\hat{z}$, then in perturbation theory at nonzero temperature the propagator for
the static mode has a double pole when $\vec{k}^2 = k_0^2$. We conjecture that
since chiral spirals spontaneously break both global and spacetime symmetries,
that such double poles are a universal property of their static transverse
modes. Fluctuations from double poles generate linear infrared divergences in
any number of spatial dimensions and disorder the condensate of chiral spirals,
analogous to a type of quantum spin liquid. The characteristic feature of this
region is that over large spatial distances the two point function is the usual
exponential times an oscillatory function. We prove this at large $N$ and
suggest this occurs for all $N > 2$. Implications for four-fermion models and
the phase diagram of QCD are discussed.
| [
{
"created": "Wed, 20 May 2020 18:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jun 2020 20:22:41 GMT",
"version": "v2"
}
] | 2020-07-22 | [
[
"Pisarski",
"Robert D.",
""
],
[
"Tsvelik",
"Alexei M.",
""
],
[
"Valgushev",
"Semeon",
""
]
] | For a scalar theory with a global $O(N)$ symmetry, when $N=2$ a spatially inhomogeneous condensate arises when the term in the Lagrangian with two spatial derivatives has a negative coefficient. If the condensate for such a chiral spiral includes only one mode, characterized by a momentum $k_0 \hat{z}$, then in perturbation theory at nonzero temperature the propagator for the static mode has a double pole when $\vec{k}^2 = k_0^2$. We conjecture that since chiral spirals spontaneously break both global and spacetime symmetries, that such double poles are a universal property of their static transverse modes. Fluctuations from double poles generate linear infrared divergences in any number of spatial dimensions and disorder the condensate of chiral spirals, analogous to a type of quantum spin liquid. The characteristic feature of this region is that over large spatial distances the two point function is the usual exponential times an oscillatory function. We prove this at large $N$ and suggest this occurs for all $N > 2$. Implications for four-fermion models and the phase diagram of QCD are discussed. |
hep-ph/0201163 | Sergei Khlebnikov | S. Khlebnikov | Strong acoustic turbulence and the speed of Bose-Einstein condensation | 18 pages, latex, 3 figures | Phys.Rev. A66 (2002) 063606 | 10.1103/PhysRevA.66.063606 | null | hep-ph astro-ph nlin.CD | null | The final stage of Bose-Einstein condensation in a large volume occurs
through coarsening--growth of individual correlated patches. We present
analytical arguments and numerical evidence that in the momentum space this
growth corresponds to strong turbulence of the particle number, with a
turbulent cascade towards the infrared and the power law $n(k) \propto
k^{-(d+1)}$ in $d=2,3$ spatial dimensions. As a corollary, we find that the
correlation length grows linearly in time, with the speed of order of the speed
of Bogoliubov's quasiparticles (phonons). We use these results to estimate the
speed of BEC in atomic vapors and in galactic dark matter.
| [
{
"created": "Thu, 17 Jan 2002 20:48:50 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Khlebnikov",
"S.",
""
]
] | The final stage of Bose-Einstein condensation in a large volume occurs through coarsening--growth of individual correlated patches. We present analytical arguments and numerical evidence that in the momentum space this growth corresponds to strong turbulence of the particle number, with a turbulent cascade towards the infrared and the power law $n(k) \propto k^{-(d+1)}$ in $d=2,3$ spatial dimensions. As a corollary, we find that the correlation length grows linearly in time, with the speed of order of the speed of Bogoliubov's quasiparticles (phonons). We use these results to estimate the speed of BEC in atomic vapors and in galactic dark matter. |
hep-ph/0210044 | Nikolai Uraltsev | Nikolai Uraltsev | Strong interaction effects in semileptonic B decays | 5 pages (two-column), LaTeX, uses espcrc2.sty. Talk given at
ICHEP-2002, July 24-31 2002, Amsterdam | Proc. of the 31st International Conference on High Energy Physics,
Amsterdam, The Netherlands, 25-31 July 2002 (North-Holland -- Elsevier, The
Netherlands, 2003), S. Bentvelsen, P. de Jong, J. Koch and E. Laenen Eds.,
p.554 | 10.1016/S0920-5632(03)90615-3 | Bicocca-FT-02-20, UND-HEP-02-BIG10 | hep-ph | null | Strong interaction effects are addressed in connection to extracting
|V_{cb}|. A comprehensive approach is described not relying on a 1/m_c
expansion; it allows a percent accuracy without ad hoc assumptions about
higher-order effects. An alternative to the M_X^2 variable is proposed
improving convergence. Intrinsic hardness of integrated observables with a cut
on E_\ell is discussed; it can be responsible for the behavior of <M_X^2>
reported by BaBar. Consequences of the proximity to the `BPS' limit are
considered.
| [
{
"created": "Wed, 2 Oct 2002 19:33:24 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Uraltsev",
"Nikolai",
""
]
] | Strong interaction effects are addressed in connection to extracting |V_{cb}|. A comprehensive approach is described not relying on a 1/m_c expansion; it allows a percent accuracy without ad hoc assumptions about higher-order effects. An alternative to the M_X^2 variable is proposed improving convergence. Intrinsic hardness of integrated observables with a cut on E_\ell is discussed; it can be responsible for the behavior of <M_X^2> reported by BaBar. Consequences of the proximity to the `BPS' limit are considered. |
hep-ph/0110204 | York Schroder | York Schroder (Univ. Helsinki & MIT) | Long-distance contributions to the QCD pressure | 5 pages; talk at Statistical QCD, Bielefeld, August 26-30, 2001 | Nucl.Phys. A702 (2002) 123-127 | 10.1016/S0375-9474(02)00694-2 | null | hep-ph | null | The QCD pressure is a most fundamental quantity, for which lattice data is
available up to a few times the critical temperature $T_c$. Perturbation
theory, even at very high temperatures, has serious convergence problems.
Combining analytical and 3d numerical methods, we show that it is possible to
compute the QCD pressure from about $2 T_c$ to infinity. We also describe an
algorithm to generate and classify high order Feynman diagrams which is
tailored to minimize computational effort.
| [
{
"created": "Mon, 15 Oct 2001 22:32:03 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Schroder",
"York",
"",
"Univ. Helsinki & MIT"
]
] | The QCD pressure is a most fundamental quantity, for which lattice data is available up to a few times the critical temperature $T_c$. Perturbation theory, even at very high temperatures, has serious convergence problems. Combining analytical and 3d numerical methods, we show that it is possible to compute the QCD pressure from about $2 T_c$ to infinity. We also describe an algorithm to generate and classify high order Feynman diagrams which is tailored to minimize computational effort. |
hep-ph/9607423 | Francesco Vissani | Francesco Vissani | R-parity breaking and the grand unification program | LaTeX, uses espcrc2.sty, 3 pages, no figures. Talk given at the 4th
International Conference on Supersymmetries in Physics (SUSY 96) College
Park, MD, 29 May - 1 Jun 1996 | Nucl.Phys.Proc.Suppl.52A:94-96,1997 | 10.1016/S0920-5632(96)00541-5 | IC/96/123 | hep-ph | null | We present the study of the possibility to have R-parity breaking
interactions in minimal SU(5). An interesting scenario emerges in which the
R-parity breaking coupling $\lambda'_{333}$ is large, and its size is related
to the value of the tau neutrino mass, assuming that supersymmetry is broken
according to low energy supergravity framework. This scenario may also have
implications on the issue of $b-\tau$ unification.
| [
{
"created": "Thu, 25 Jul 1996 09:21:48 GMT",
"version": "v1"
}
] | 2011-01-25 | [
[
"Vissani",
"Francesco",
""
]
] | We present the study of the possibility to have R-parity breaking interactions in minimal SU(5). An interesting scenario emerges in which the R-parity breaking coupling $\lambda'_{333}$ is large, and its size is related to the value of the tau neutrino mass, assuming that supersymmetry is broken according to low energy supergravity framework. This scenario may also have implications on the issue of $b-\tau$ unification. |
hep-ph/0411257 | Qiang Zhao | Qiang Zhao and Frank E. Close | Restricted locality of quark-hadron duality in exclusive meson
photoproduction reactions above the resonance region | Contribution to the 10th International Symposium on Meson-Nucleon
Physics and the Structure of the Nucleon (MENU2004), Beijing, 2004; presented
by QZ | Int.J.Mod.Phys. A20 (2005) 1910-1913 | 10.1142/S0217751X0502361X | null | hep-ph | null | We show how deviations from the dimensional scaling laws for exclusive
processes may be related to a breakdown in the locality of quark-hadron
duality, i.e. the "restricted locality". For exclusive reactions like meson
photo- and electroproduction above the resonance region, we explore the effects
arising from such a local duality breaking and propose that it can be a
possible source for oscillations about the smooth quark counting rule predicted
by pQCD in the 90-degree differential cross sections.
| [
{
"created": "Fri, 19 Nov 2004 14:31:02 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Zhao",
"Qiang",
""
],
[
"Close",
"Frank E.",
""
]
] | We show how deviations from the dimensional scaling laws for exclusive processes may be related to a breakdown in the locality of quark-hadron duality, i.e. the "restricted locality". For exclusive reactions like meson photo- and electroproduction above the resonance region, we explore the effects arising from such a local duality breaking and propose that it can be a possible source for oscillations about the smooth quark counting rule predicted by pQCD in the 90-degree differential cross sections. |
hep-ph/9610310 | Marina Nielsen | S. Paiva, M. Nielsen, F.S. Navarra, F.O. Dur\~aes and L.L. Barz | Virtual Meson Cloud of the Nucleon and Intrinsic Strangeness and Charm | 9 pages RevTex, 4 figures | Mod.Phys.Lett. A13 (1998) 2715-2724 | 10.1142/S0217732398002886 | IFUSP/P-1240 | hep-ph | null | We have applied the Meson Cloud Model (MCM) to calculate the charm and
strange antiquark distribution in the nucleon. The resulting distribution, in
the case of charm, is very similar to the intrinsic charm momentum distribution
in the nucleon. This seems to corroborate the hypothesis that the intrinsic
charm is in the cloud and, at the same time, explains why other calculations
with the MCM involving strange quark distributions fail in reproducing the low
x region data. From the intrinsic strange distribution in the nucleon we have
extracted the strangeness radius of the nucleon, which is in agreement with
other meson cloud calculations.
| [
{
"created": "Thu, 10 Oct 1996 07:55:55 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Paiva",
"S.",
""
],
[
"Nielsen",
"M.",
""
],
[
"Navarra",
"F. S.",
""
],
[
"Durães",
"F. O.",
""
],
[
"Barz",
"L. L.",
""
]
] | We have applied the Meson Cloud Model (MCM) to calculate the charm and strange antiquark distribution in the nucleon. The resulting distribution, in the case of charm, is very similar to the intrinsic charm momentum distribution in the nucleon. This seems to corroborate the hypothesis that the intrinsic charm is in the cloud and, at the same time, explains why other calculations with the MCM involving strange quark distributions fail in reproducing the low x region data. From the intrinsic strange distribution in the nucleon we have extracted the strangeness radius of the nucleon, which is in agreement with other meson cloud calculations. |
1703.00173 | Yueling Yang | Junfeng Sun, Yueling Yang, Qingxia Li, Haiyan Li, Na Wang, Qin Chang,
Jinshu Huang | Study on the ${\Upsilon}(1S)$ ${\to}$ $B_{c}D_{s}$ decay | 15 pages, 2 pages, revtex. arXiv admin note: substantial text overlap
with arXiv:1701.04597 | Nucl. Phys. B 903, 371-386 (2016) | 10.1016/j.nuclphysb.2016.01.004 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The branching ratio and direct $CP$ asymmetry of the ${\Upsilon}(1S)$ ${\to}$
$B_{c}D_{s}$ weak decay are estimated with the perturbative QCD approach. It is
found that (1) The direct $CP$-violating asymmetry is close to zero. (2) the
branching ratio ${\cal B}r({\Upsilon}(1S){\to}B_{c}D_{s})$ ${\gtrsim}$
$10^{-10}$ might be measurable at the future experiments.
| [
{
"created": "Wed, 1 Mar 2017 08:12:44 GMT",
"version": "v1"
}
] | 2017-03-02 | [
[
"Sun",
"Junfeng",
""
],
[
"Yang",
"Yueling",
""
],
[
"Li",
"Qingxia",
""
],
[
"Li",
"Haiyan",
""
],
[
"Wang",
"Na",
""
],
[
"Chang",
"Qin",
""
],
[
"Huang",
"Jinshu",
""
]
] | The branching ratio and direct $CP$ asymmetry of the ${\Upsilon}(1S)$ ${\to}$ $B_{c}D_{s}$ weak decay are estimated with the perturbative QCD approach. It is found that (1) The direct $CP$-violating asymmetry is close to zero. (2) the branching ratio ${\cal B}r({\Upsilon}(1S){\to}B_{c}D_{s})$ ${\gtrsim}$ $10^{-10}$ might be measurable at the future experiments. |
1411.1071 | John Cherry Jr. | John F. Cherry and Alexander Friedland and Ian M. Shoemaker | Neutrino Portal Dark Matter: From Dwarf Galaxies to IceCube | 10 pages, and 3 figures | null | null | null | hep-ph astro-ph.GA astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been suggested that the baseline scenario of collisionless cold dark
matter over-predicts the numbers of satellite galaxies, as well as the dark
matter (DM) densities in galactic centers. This apparent lack of structure at
small scales can be accounted for if one postulates neutrino-DM and DM-DM
interactions mediated by light O(MeV) force carriers. In this letter, we
consider a simple, consistent model of neutrinophilic DM with these features
where DM and a "secluded" SM-singlet neutrino species are charged under a new
$U(1)$ gauge symmetry. An important ingredient of this model is that the
secluded sector couples to the Standard Model fields only through neutrino
mixing. We observe that the secluded and active neutrinos recouple, leading to
a large relic secluded neutrino population. This relic population can prevent
small-scale halos from collapsing, while at same time significantly modifying
the optical depth of ultra-high-energy neutrinos recently observed at Icecube.
We find that the bulk of the parameter space accommodating an (a)symmetric
thermal relic has potentially observable consequences for the IceCube high
energy signal, with some of the parameter ranges already ruled out by the
existing data. Future data may confirm this mechanism if either spectral
absorption features or correlations with nearby sources are observed.
| [
{
"created": "Tue, 4 Nov 2014 21:00:27 GMT",
"version": "v1"
}
] | 2014-11-06 | [
[
"Cherry",
"John F.",
""
],
[
"Friedland",
"Alexander",
""
],
[
"Shoemaker",
"Ian M.",
""
]
] | It has been suggested that the baseline scenario of collisionless cold dark matter over-predicts the numbers of satellite galaxies, as well as the dark matter (DM) densities in galactic centers. This apparent lack of structure at small scales can be accounted for if one postulates neutrino-DM and DM-DM interactions mediated by light O(MeV) force carriers. In this letter, we consider a simple, consistent model of neutrinophilic DM with these features where DM and a "secluded" SM-singlet neutrino species are charged under a new $U(1)$ gauge symmetry. An important ingredient of this model is that the secluded sector couples to the Standard Model fields only through neutrino mixing. We observe that the secluded and active neutrinos recouple, leading to a large relic secluded neutrino population. This relic population can prevent small-scale halos from collapsing, while at same time significantly modifying the optical depth of ultra-high-energy neutrinos recently observed at Icecube. We find that the bulk of the parameter space accommodating an (a)symmetric thermal relic has potentially observable consequences for the IceCube high energy signal, with some of the parameter ranges already ruled out by the existing data. Future data may confirm this mechanism if either spectral absorption features or correlations with nearby sources are observed. |
hep-ph/0610165 | Ferruccio Feruglio | Guido Altarelli, Ferruccio Feruglio and Yin Lin | Tri-bimaximal Neutrino Mixing from Orbifolding | 16 pages, 2 figures | Nucl.Phys.B775:31-44,2007 | 10.1016/j.nuclphysb.2007.03.042 | DFPD-06/TH/12,RM3-TH/06-17,CERN-PH-TH/2006-205 | hep-ph | null | We show that the A4 discrete symmetry that naturally leads to tri-bimaximal
neutrino mixing can be simply obtained as a result of an orbifolding starting
from a model in 6 dimensions. This particular orbifolding has four fixed points
where 4 dimensional branes are located and the tetrahedral symmetry of A4
connects these branes. In this approach A4 appears after the reduction from six
to four dimensions as a remnant of the 6D space-time symmetry. A previously
discussed supersymmetric version of A4 is reinterpreted along these lines.
| [
{
"created": "Fri, 13 Oct 2006 13:44:25 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Altarelli",
"Guido",
""
],
[
"Feruglio",
"Ferruccio",
""
],
[
"Lin",
"Yin",
""
]
] | We show that the A4 discrete symmetry that naturally leads to tri-bimaximal neutrino mixing can be simply obtained as a result of an orbifolding starting from a model in 6 dimensions. This particular orbifolding has four fixed points where 4 dimensional branes are located and the tetrahedral symmetry of A4 connects these branes. In this approach A4 appears after the reduction from six to four dimensions as a remnant of the 6D space-time symmetry. A previously discussed supersymmetric version of A4 is reinterpreted along these lines. |
hep-ph/0601033 | Branimir Zauner | A. Svarc, S. Ceci and B. Zauner | The importance of inelastic channels in eliminating continuum
ambiguities in pion-nucleon partial wave analyses | 9 pages, 9 figures; Invited plenary talk held at NSTAR 2005 in
Tallahassee, FL | null | 10.1142/9789812773333_0004 | null | hep-ph | null | Single channel, single energy partial wave analyses (SE_PWA) are from the
first principles non-unique in the inelastic region if only data from elastic
channels are used, so we in details discuss mechanisms how the problem is
eliminated in pion-nucleon scattering. The "continuum ambiguities" puzzle has
been extensively discussed since early 1970es, and two major mechanisms for
solving the problem have been suggested: either to ensure the continuity of
Argand diagrams by imposing the T-matrix t-channel analyticity
(Karlsruhe-Helsinki, VPI/GWU) or to restore the unitarity loss in the
kinematical regime where the inelastic channels are successively opened by
replacing the standard single channel PWA by the coupled channel formalism
(CMB, Zagreb, Kent, Pittsburgh/ANL, Giessen). In both approaches the
insufficiency of the single channel data is eliminated by introducing
additional constraints using the data from other channels. The importance and
physical meaning of the second approach is presented in details, and the
significance of inelastic channels for the uniqueness of the partial wave
analysis is discussed. The outline of the procedure for utilizing the coupled
channel formalism to perform the search for the minimal number/full set of
T-matrix poles in the complex energy plane, which connect the quark model
predictions to experimental reality, is proposed. The appearance of new,
additional resonances unneeded in the sole elastic channel is demonstrated.
| [
{
"created": "Thu, 5 Jan 2006 11:54:43 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Svarc",
"A.",
""
],
[
"Ceci",
"S.",
""
],
[
"Zauner",
"B.",
""
]
] | Single channel, single energy partial wave analyses (SE_PWA) are from the first principles non-unique in the inelastic region if only data from elastic channels are used, so we in details discuss mechanisms how the problem is eliminated in pion-nucleon scattering. The "continuum ambiguities" puzzle has been extensively discussed since early 1970es, and two major mechanisms for solving the problem have been suggested: either to ensure the continuity of Argand diagrams by imposing the T-matrix t-channel analyticity (Karlsruhe-Helsinki, VPI/GWU) or to restore the unitarity loss in the kinematical regime where the inelastic channels are successively opened by replacing the standard single channel PWA by the coupled channel formalism (CMB, Zagreb, Kent, Pittsburgh/ANL, Giessen). In both approaches the insufficiency of the single channel data is eliminated by introducing additional constraints using the data from other channels. The importance and physical meaning of the second approach is presented in details, and the significance of inelastic channels for the uniqueness of the partial wave analysis is discussed. The outline of the procedure for utilizing the coupled channel formalism to perform the search for the minimal number/full set of T-matrix poles in the complex energy plane, which connect the quark model predictions to experimental reality, is proposed. The appearance of new, additional resonances unneeded in the sole elastic channel is demonstrated. |
hep-ph/9905338 | Benjamin Tseng | B. Tseng, Cheng-Wei Chiang | Charmless Hardronic Decays $B_u \to V V $: Angular Distributions, Direct
CP Violation and Determination of the Unitary Triangle | 14 pages, Latex | null | null | null | hep-ph | null | Two-body charmless nonleptonic decays of $B_u \to V V$ are studied within the
generalized factorization approach using a recent calculation of the effective
Wilson coefficients $c^{eff}_i$, which are not only renormalization-scale and
-scheme independent but also gauge invariant and infrared finite. After making
a universal ansatz for the nonfactorizable contributions, we parametrize these
effects in terms of $N_c^{eff}(LL)$ and $N_c^{eff}(LR)$, the effective numbers
of colors arising from $(V-A)(V-A)$ and $(V-A)(V+A)$ four-quark operators,
respectively. Three different schemes for these contributions are considered:
(i) the naive factorization, (ii) the large-N_c improved factorization, and
(iii) our preferred choice: $(N_c^{eff}(LL), N_c^{eff}(RR))=(2,5)$. We present
the full angular distribution of all charmless $B_u \to V V$ decays in both
transversity and helicity frames.Direct CP violation in these normalized
angular correlation coefficients is not negligible in $B^-_u \to K^{*-} \rho^0,
K^{*-} \omega$, and direct CP violation in the partial rate difference for
$B^-_u \to K^{*-} \omega, K^{*-} \rho$ and $\rho^- \omega$ can be as large as
45%, 25%, -10%, respectively. Due to the sizable QCD penguin contributions in
$\rho^- \omega$, the determination of the unitary triangle $\alpha$ via this
decay mode is more promising than via $\rho^- \rho^0$. It is also encouraging
to determine the unitary triangle $\gamma$ through $B^-_u \to K^{*-} \rho$
because of $N_c$-insensitivity and the not-so-small tree contribution. The
impacts of a negative $\rho$ on the branching ratios and CP violation are
studied. We also comment on the theoretical uncertainties and their possible
impacts.
| [
{
"created": "Fri, 14 May 1999 05:56:41 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Tseng",
"B.",
""
],
[
"Chiang",
"Cheng-Wei",
""
]
] | Two-body charmless nonleptonic decays of $B_u \to V V$ are studied within the generalized factorization approach using a recent calculation of the effective Wilson coefficients $c^{eff}_i$, which are not only renormalization-scale and -scheme independent but also gauge invariant and infrared finite. After making a universal ansatz for the nonfactorizable contributions, we parametrize these effects in terms of $N_c^{eff}(LL)$ and $N_c^{eff}(LR)$, the effective numbers of colors arising from $(V-A)(V-A)$ and $(V-A)(V+A)$ four-quark operators, respectively. Three different schemes for these contributions are considered: (i) the naive factorization, (ii) the large-N_c improved factorization, and (iii) our preferred choice: $(N_c^{eff}(LL), N_c^{eff}(RR))=(2,5)$. We present the full angular distribution of all charmless $B_u \to V V$ decays in both transversity and helicity frames.Direct CP violation in these normalized angular correlation coefficients is not negligible in $B^-_u \to K^{*-} \rho^0, K^{*-} \omega$, and direct CP violation in the partial rate difference for $B^-_u \to K^{*-} \omega, K^{*-} \rho$ and $\rho^- \omega$ can be as large as 45%, 25%, -10%, respectively. Due to the sizable QCD penguin contributions in $\rho^- \omega$, the determination of the unitary triangle $\alpha$ via this decay mode is more promising than via $\rho^- \rho^0$. It is also encouraging to determine the unitary triangle $\gamma$ through $B^-_u \to K^{*-} \rho$ because of $N_c$-insensitivity and the not-so-small tree contribution. The impacts of a negative $\rho$ on the branching ratios and CP violation are studied. We also comment on the theoretical uncertainties and their possible impacts. |
1508.04273 | Sheung Tsun Tsou | HM Chan (Rutherford Appleton Laboratory) and ST Tsou (Mathematical
Institute, Oxford University) | The Framed Standard Model (II) - A first Test against Experiment | Invited talk given by TST at the Conference on 60 Years of Yang-Mills
Gauge Theories, IAS, Singapore, 25-28 May 2015, 15 pages, 7 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Apart from the qualitative features described in \cite{chm}, the
renormalization group equation derived for the rotation of the fermion mass
matrices are amenable to quantitative study. The equation depends on a coupling
and a fudge factor and, on integration, on 3 integration constants. Its
application to data analysis, however, requires the input from experiment of
the heaviest generation masses $m_t, m_b, m_\tau, m_{\nu_3}$ all of which are
known, except for $m_{\nu_3}$. Together then with the theta-angle in the QCD
action, there are in all 7 real unknown parameters. Determining these 7
parameters by fitting to the experimental values of the masses $m_c, m_\mu,
m_e$, the CKM elements $|V_{us}|, |V_{ub}|$, and the neutrino oscillation angle
$\sin^2\theta_{13}$, one can then calculate and compare with experiment the
following 12 other quantities $m_s,
m_u/m_d, |V_{ud}|, |V_{cs}|, |V_{tb}|, |V_{cd}|, |V_{cb}|, |V_{ts}|,
|V_{td}|, J, \sin^2 2\theta_{12}, \sin^2 2\theta_{23}$, and the results all
agree reasonably well with data, often to within the stringent experimental
error now achieved. Counting the predictions not yet measured by experiment,
this means that 17 independent parameters of the standard model are now
replaced by 7 in the FSM.
| [
{
"created": "Tue, 18 Aug 2015 10:45:28 GMT",
"version": "v1"
}
] | 2015-08-19 | [
[
"Chan",
"HM",
"",
"Rutherford Appleton Laboratory"
],
[
"Tsou",
"ST",
"",
"Mathematical\n Institute, Oxford University"
]
] | Apart from the qualitative features described in \cite{chm}, the renormalization group equation derived for the rotation of the fermion mass matrices are amenable to quantitative study. The equation depends on a coupling and a fudge factor and, on integration, on 3 integration constants. Its application to data analysis, however, requires the input from experiment of the heaviest generation masses $m_t, m_b, m_\tau, m_{\nu_3}$ all of which are known, except for $m_{\nu_3}$. Together then with the theta-angle in the QCD action, there are in all 7 real unknown parameters. Determining these 7 parameters by fitting to the experimental values of the masses $m_c, m_\mu, m_e$, the CKM elements $|V_{us}|, |V_{ub}|$, and the neutrino oscillation angle $\sin^2\theta_{13}$, one can then calculate and compare with experiment the following 12 other quantities $m_s, m_u/m_d, |V_{ud}|, |V_{cs}|, |V_{tb}|, |V_{cd}|, |V_{cb}|, |V_{ts}|, |V_{td}|, J, \sin^2 2\theta_{12}, \sin^2 2\theta_{23}$, and the results all agree reasonably well with data, often to within the stringent experimental error now achieved. Counting the predictions not yet measured by experiment, this means that 17 independent parameters of the standard model are now replaced by 7 in the FSM. |
hep-ph/9907510 | null | G.F. Giudice, A. Riotto, and I. Tkachev (CERN) | Non-Thermal Production of Dangerous Relics in the Early Universe | 21 pages, 4 Postscript figures | JHEP 9908 (1999) 009 | 10.1088/1126-6708/1999/08/009 | CERN-TH/99-227 | hep-ph astro-ph hep-th | null | Many models of supersymmetry breaking, in the context of either supergravity
or superstring theories, predict the presence of particles with weak scale
masses and Planck-suppressed couplings. Typical examples are the scalar moduli
and the gravitino. Excessive production of such particles in the early Universe
destroys the successful predictions of nucleosynthesis. In particular, the
thermal production of these relics after inflation leads to a bound on the
reheating temperature, T_{RH} < 10^9 GeV. In this paper we show that the
non-thermal generation of these dangerous relics may be much more efficient
than the thermal production after inflation. Scalar moduli fields may be
copiously created by the classical gravitational effects on the vacuum state.
Consequently, the new upper bound on the reheating temperature is shown to be,
in some cases, as low as 100 GeV. We also study the non-thermal production of
gravitinos in the early Universe, which can be extremely efficient and overcome
the thermal production by several orders of magnitude, in realistic
supersymmetric inflationary models.
| [
{
"created": "Tue, 27 Jul 1999 11:02:24 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Giudice",
"G. F.",
"",
"CERN"
],
[
"Riotto",
"A.",
"",
"CERN"
],
[
"Tkachev",
"I.",
"",
"CERN"
]
] | Many models of supersymmetry breaking, in the context of either supergravity or superstring theories, predict the presence of particles with weak scale masses and Planck-suppressed couplings. Typical examples are the scalar moduli and the gravitino. Excessive production of such particles in the early Universe destroys the successful predictions of nucleosynthesis. In particular, the thermal production of these relics after inflation leads to a bound on the reheating temperature, T_{RH} < 10^9 GeV. In this paper we show that the non-thermal generation of these dangerous relics may be much more efficient than the thermal production after inflation. Scalar moduli fields may be copiously created by the classical gravitational effects on the vacuum state. Consequently, the new upper bound on the reheating temperature is shown to be, in some cases, as low as 100 GeV. We also study the non-thermal production of gravitinos in the early Universe, which can be extremely efficient and overcome the thermal production by several orders of magnitude, in realistic supersymmetric inflationary models. |
1506.03456 | Farinaldo Queiroz | Sudhanwa Patra, Farinaldo S. Queiroz, Werner Rodejohann | Stringent Dilepton Bounds on Left-Right Models using LHC data | 5 pages, 3 figures, 1 table. To appear in Phys. Lett. B | null | 10.1016/j.physletb.2015.11.009 | CETUP2015-022 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In canonical left-right symmetric models the lower mass bounds on the charged
gauge bosons are in the ballpark of $3-4$ TeV, resulting into much stronger
limits on the neutral gauge boson $Z_R$, making its production unreachable at
the LHC. However, if one evokes different patterns of left-right symmetry
breaking the $Z_R$ might be lighter than the $W_R^\pm$ motivating an
independent $Z_R$ collider study. In this work, we use the 8 TeV ATLAS $20.3$
fb$^{-1}$ luminosity data to derive robust bounds on the $Z_R$ mass using
dilepton data. %because they provide the most restrictive limits due to the
sizable $Z_R$-lepton couplings. We find strong lower bounds on the $Z_R$ mass
for different right-handed gauge couplings, excluding $Z_R$ masses up to $\sim
3.2$TeV. For the canonical LR model we place a lower mass bound of $\sim
2.5$TeV. Our findings are almost independent of the right-handed neutrino
masses ($\sim 2\,\%$ effect) and applicable to general left-right models.
| [
{
"created": "Wed, 10 Jun 2015 20:01:27 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Nov 2015 10:58:56 GMT",
"version": "v2"
}
] | 2015-11-25 | [
[
"Patra",
"Sudhanwa",
""
],
[
"Queiroz",
"Farinaldo S.",
""
],
[
"Rodejohann",
"Werner",
""
]
] | In canonical left-right symmetric models the lower mass bounds on the charged gauge bosons are in the ballpark of $3-4$ TeV, resulting into much stronger limits on the neutral gauge boson $Z_R$, making its production unreachable at the LHC. However, if one evokes different patterns of left-right symmetry breaking the $Z_R$ might be lighter than the $W_R^\pm$ motivating an independent $Z_R$ collider study. In this work, we use the 8 TeV ATLAS $20.3$ fb$^{-1}$ luminosity data to derive robust bounds on the $Z_R$ mass using dilepton data. %because they provide the most restrictive limits due to the sizable $Z_R$-lepton couplings. We find strong lower bounds on the $Z_R$ mass for different right-handed gauge couplings, excluding $Z_R$ masses up to $\sim 3.2$TeV. For the canonical LR model we place a lower mass bound of $\sim 2.5$TeV. Our findings are almost independent of the right-handed neutrino masses ($\sim 2\,\%$ effect) and applicable to general left-right models. |
hep-ph/0111046 | Ed Stoeffhaas | M.M. Block, F. Halzen, and G. Pancheri | On Factorization, Quark Counting, and Vector Dominance | Latex2e, 11 pages, 6 postscript figures, uses epsfig.sty. Version to
be published in Eur. Phys. Jour. C | Eur.Phys.J.C23:329-335,2002 | 10.1007/s100520100885 | NUHEP 901, MADPH-01-1251 | hep-ph | null | Using an eikonal structure for the scattering amplitude, Block and Kaidalov
have derived factorization theorems for nucleon-nucleon, $\gamma p$ and
$\gamma\gamma$ scattering at high energies, using only some very general
assumptions. We present here an analysis giving experimental confirmation for
factorization of cross sections, nuclear slope parameters B and $\rho$-values
(ratio of real to imaginary portion of forward scattering amplitudes), showing
that: i) the three factorization theorems hold, ii) the additive quark model
holds to ~1%, and iii) vector dominance holds to better than ~4%.
| [
{
"created": "Mon, 5 Nov 2001 20:31:57 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Dec 2001 19:58:31 GMT",
"version": "v2"
}
] | 2011-09-13 | [
[
"Block",
"M. M.",
""
],
[
"Halzen",
"F.",
""
],
[
"Pancheri",
"G.",
""
]
] | Using an eikonal structure for the scattering amplitude, Block and Kaidalov have derived factorization theorems for nucleon-nucleon, $\gamma p$ and $\gamma\gamma$ scattering at high energies, using only some very general assumptions. We present here an analysis giving experimental confirmation for factorization of cross sections, nuclear slope parameters B and $\rho$-values (ratio of real to imaginary portion of forward scattering amplitudes), showing that: i) the three factorization theorems hold, ii) the additive quark model holds to ~1%, and iii) vector dominance holds to better than ~4%. |
1512.00022 | Xavier Garcia i Tormo | Thomas Becher, Xavier Garcia i Tormo, Jan Piclum | Next-to-next-to-leading logarithmic resummation for transverse thrust | 6 pages, 2 figures. v2: Corrected values in Eq.(15); updated Figure 2
accordingly | Phys. Rev. D 93, 054038 (2016) | 10.1103/PhysRevD.93.054038 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain a prediction for the hadron-collider event-shape variable
transverse thrust in which the terms enhanced in the dijet limit are resummed
to next-to-next-to-leading logarithmic accuracy. Our method exploits
universality properties made manifest in the factorized expression for the
cross section and only requires one-loop calculations. The necessary two-loop
ingredients are extracted using known results and existing numerical codes. Our
technique is general and applicable to other observables as well.
| [
{
"created": "Mon, 30 Nov 2015 21:00:07 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Apr 2016 14:45:14 GMT",
"version": "v2"
}
] | 2016-04-11 | [
[
"Becher",
"Thomas",
""
],
[
"Tormo",
"Xavier Garcia i",
""
],
[
"Piclum",
"Jan",
""
]
] | We obtain a prediction for the hadron-collider event-shape variable transverse thrust in which the terms enhanced in the dijet limit are resummed to next-to-next-to-leading logarithmic accuracy. Our method exploits universality properties made manifest in the factorized expression for the cross section and only requires one-loop calculations. The necessary two-loop ingredients are extracted using known results and existing numerical codes. Our technique is general and applicable to other observables as well. |
hep-ph/0404084 | Michele Frigerio | Shao-Long Chen, Michele Frigerio and Ernest Ma (UC Riverside) | Large neutrino mixing and normal mass hierarchy: a discrete
understanding | 9 pages, revtex, 1 eps figure; clarifications and comments added in
sections III.A.1. and III.C.; typos corrected; several references added | Phys.Rev.D70:073008,2004; Erratum-ibid.D70:079905,2004 | 10.1103/PhysRevD.70.073008 10.1103/PhysRevD.70.079905 | UCRHEP-T373 | hep-ph | null | We discuss the possibility of flavor symmetries to explain the pattern of
charged lepton and neutrino masses and mixing angles. We emphasize what are the
obstacles for the generation of an almost maximal atmospheric mixing and what
are the minimal ingredients to obtain it. A model based on the discrete
symmetry $S_3$ is constructed, which leads to the dominant $\mu\tau$-block in
the neutrino mass matrix, thus predicting normal hierarchy. This symmetry makes
it possible to reproduce current data and predicts
$0.01\lesssim\theta_{13}\lesssim 0.03$ and strongly suppressed neutrinoless
$2\beta$-decay. Moreover, it implies a relation between lepton and quark mixing
angles: $\theta_{23}^q \approx 2(\pi/4-\theta_{23})$. The Cabibbo mixing can
also be reproduced and $\theta_{13}^q\sim \theta_{12}^q\theta_{23}^q$. $S_3$ is
thus a candidate to describe all the basic features of Standard Model fermion
masses and mixing.
| [
{
"created": "Thu, 8 Apr 2004 18:30:25 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Aug 2004 23:42:26 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Chen",
"Shao-Long",
"",
"UC Riverside"
],
[
"Frigerio",
"Michele",
"",
"UC Riverside"
],
[
"Ma",
"Ernest",
"",
"UC Riverside"
]
] | We discuss the possibility of flavor symmetries to explain the pattern of charged lepton and neutrino masses and mixing angles. We emphasize what are the obstacles for the generation of an almost maximal atmospheric mixing and what are the minimal ingredients to obtain it. A model based on the discrete symmetry $S_3$ is constructed, which leads to the dominant $\mu\tau$-block in the neutrino mass matrix, thus predicting normal hierarchy. This symmetry makes it possible to reproduce current data and predicts $0.01\lesssim\theta_{13}\lesssim 0.03$ and strongly suppressed neutrinoless $2\beta$-decay. Moreover, it implies a relation between lepton and quark mixing angles: $\theta_{23}^q \approx 2(\pi/4-\theta_{23})$. The Cabibbo mixing can also be reproduced and $\theta_{13}^q\sim \theta_{12}^q\theta_{23}^q$. $S_3$ is thus a candidate to describe all the basic features of Standard Model fermion masses and mixing. |
hep-ph/0212384 | Yasuhiro Shimizu | Naoyuki Haba, Yasuhiro Shimizu | A simple model of generating fermion mass hierarchy in N=1
supersymmetric 6D SO(10) GUT | 10 page, 1 figure | Phys.Lett.B560:133-139,2003 | 10.1016/S0370-2693(03)00377-0 | null | hep-ph | null | We suggest simple models which produce the suitable fermion mass hierarchies
and flavor mixing angles based on the 6 dimensional N=1 supersymmetric SO(10)
grand unified theory compactified on a $T^2/(Z_2 \times Z_2')$ orbifold. We
introduce 6D and 5D matter fields, which contains the 1st and 2nd generation
matter fields as the zero modes, respectively. The 3rd generation matter fields
are located on a 4D brane. The Yukawa couplings for bulk fields are suppressed
by volume factors from extra dimensions. The suitable fermion mass hierarchies
and flavor mixings are generated by the volume suppression factors.
| [
{
"created": "Sun, 29 Dec 2002 13:24:53 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Haba",
"Naoyuki",
""
],
[
"Shimizu",
"Yasuhiro",
""
]
] | We suggest simple models which produce the suitable fermion mass hierarchies and flavor mixing angles based on the 6 dimensional N=1 supersymmetric SO(10) grand unified theory compactified on a $T^2/(Z_2 \times Z_2')$ orbifold. We introduce 6D and 5D matter fields, which contains the 1st and 2nd generation matter fields as the zero modes, respectively. The 3rd generation matter fields are located on a 4D brane. The Yukawa couplings for bulk fields are suppressed by volume factors from extra dimensions. The suitable fermion mass hierarchies and flavor mixings are generated by the volume suppression factors. |
2207.03249 | Kiran Sharma Ms | Kiran Sharma (IIT Bhilai) and Sudhanwa Patra (IIT Bhilai) | Study of matter effects in the presence of sterile neutrino using OMSD
approximation | 10 page, regular article, submitted for review in PRD | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We discuss the transition and survival probabilities in $3+1$ neutrino flavor
mixing scenario in presence of matter effects. We adopt the well-known OMSD(One
Mass Scale Dominance) approximation to carry out our analysis. After that we
perform series expansion about $\sin \theta_{13}$ term upto second order. We
find that our results are consistent with the already existing $\alpha - \sin
\theta_{13}$ approximated relations in the limit of vanishing $\alpha$ and
phases involving sterile neutrinos. We also figure out that survival transition
probability becomes independent of the fundamental and sterile CP phases under
our formalism. Hence, it provides us a new way to look at only matter effects
contribution to oscillation probability. Also, the transition probability at
the same time gives an independent study of CP-violation arising from the
sterile phases, in the vicinity of fundamental CP violation phase. We provide
the relation for the atmospheric probability in the presence of matter by
performing the series expansion upto linear order about parameter $A (= 2EV)$,
with V being the effective matter potential under OMSD approximation.
| [
{
"created": "Thu, 7 Jul 2022 12:00:14 GMT",
"version": "v1"
}
] | 2022-07-08 | [
[
"Sharma",
"Kiran",
"",
"IIT Bhilai"
],
[
"Patra",
"Sudhanwa",
"",
"IIT Bhilai"
]
] | We discuss the transition and survival probabilities in $3+1$ neutrino flavor mixing scenario in presence of matter effects. We adopt the well-known OMSD(One Mass Scale Dominance) approximation to carry out our analysis. After that we perform series expansion about $\sin \theta_{13}$ term upto second order. We find that our results are consistent with the already existing $\alpha - \sin \theta_{13}$ approximated relations in the limit of vanishing $\alpha$ and phases involving sterile neutrinos. We also figure out that survival transition probability becomes independent of the fundamental and sterile CP phases under our formalism. Hence, it provides us a new way to look at only matter effects contribution to oscillation probability. Also, the transition probability at the same time gives an independent study of CP-violation arising from the sterile phases, in the vicinity of fundamental CP violation phase. We provide the relation for the atmospheric probability in the presence of matter by performing the series expansion upto linear order about parameter $A (= 2EV)$, with V being the effective matter potential under OMSD approximation. |
hep-ph/0103035 | Alfred Tang | Alfred Tang | MKN Theory of Bound States | Latex, 16 pages, 1 table, 1 figure | null | null | null | hep-ph | null | This paper derives most of the formulas in the MKN (Maung-Kahana-Norbury)
Theory of bound states which incorporates the Lande Subtraction method to
remove the singularities of the Cornell potential.
| [
{
"created": "Fri, 2 Mar 2001 23:17:00 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Mar 2001 06:47:51 GMT",
"version": "v2"
},
{
"created": "Sat, 10 Mar 2001 18:19:02 GMT",
"version": "v3"
},
{
"created": "Mon, 19 Mar 2001 01:51:00 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Tang",
"Alfred",
""
]
] | This paper derives most of the formulas in the MKN (Maung-Kahana-Norbury) Theory of bound states which incorporates the Lande Subtraction method to remove the singularities of the Cornell potential. |
1505.03275 | Qili Liao qililiao | Qi-Li Liao, Yan Yu, Ya Deng, Guo-Ya Xie, and Guang-Chuan Wang | Excited Heavy Quarkonium Production via Z^0 Decays at a High Luminosity
Collider | 10 pages, 13 figures. arXiv admin note: substantial text overlap with
arXiv:1408.5563 | Phys. Rev. D 91, 114030 (2015) | 10.1103/PhysRevD.91.114030 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a systematic study of the production of the heavy quarkonium,
i.e., $|(c\bar{c})[n] \rangle$ , $|(b\bar{c})[n] \rangle$ (or $|(c\bar{b})[n]
\rangle$), and $|(b\bar{b})[n] \rangle$ quarkonium [$|(Q\bar{Q'})[n]\rangle$
quarkonium for short], through $Z^0$ boson semi-exclusive decays with new
parameters \cite{lx} for the heavy quarkonium under the framework of the NRQCD,
where $[n]$ stands for $n^1S_0$, $n^3S_1$, $n^1P_0$, $n^3P_J$ ($n=1, \cdots,
6$; $J=(0, 1, 2)$). "Improved trace technology" is adopted to derive the
simplified analytic expressions at the amplitude level, which shall be useful
for dealing with these decay channels. If all higher $|(Q\bar{Q'})[n]\rangle$
quarkonium states decay to the ground state $|(Q\bar{Q'})[1^1S_0]\rangle$ with
$100\%$ efficiency via electromagnetic or hadronic interactions, we obtain
$\Gamma{(Z^0\to |(c\bar{c})[1^1S_0]\rangle)}=1476$ KeV, $\Gamma{(Z^0\to
|(b\bar{c})[1^1S_0]\rangle)}=1485$ KeV, $\Gamma{(Z^0\to
|(b\bar{b})[1^1S_0]\rangle)}=127.5$ KeV. At the LHC and ILC with the luminosity
${\cal L}\propto 10^{34}cm^{-2}s^{-1}$, sizable heavy quarkonium events can be
produced through $Z^0$ boson decays, i.e., about $5.9~\times10^{5}$
$(c\bar{c})$, $6.0~\times10^{5}$ $(b\bar{c})$ (or $(c\bar{b})$),
$5.1~\times10^{4}$ $(b\bar{b})$ events per year can be obtained.
| [
{
"created": "Wed, 13 May 2015 08:37:31 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jun 2015 15:09:32 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Jun 2015 01:44:27 GMT",
"version": "v3"
}
] | 2015-07-01 | [
[
"Liao",
"Qi-Li",
""
],
[
"Yu",
"Yan",
""
],
[
"Deng",
"Ya",
""
],
[
"Xie",
"Guo-Ya",
""
],
[
"Wang",
"Guang-Chuan",
""
]
] | We present a systematic study of the production of the heavy quarkonium, i.e., $|(c\bar{c})[n] \rangle$ , $|(b\bar{c})[n] \rangle$ (or $|(c\bar{b})[n] \rangle$), and $|(b\bar{b})[n] \rangle$ quarkonium [$|(Q\bar{Q'})[n]\rangle$ quarkonium for short], through $Z^0$ boson semi-exclusive decays with new parameters \cite{lx} for the heavy quarkonium under the framework of the NRQCD, where $[n]$ stands for $n^1S_0$, $n^3S_1$, $n^1P_0$, $n^3P_J$ ($n=1, \cdots, 6$; $J=(0, 1, 2)$). "Improved trace technology" is adopted to derive the simplified analytic expressions at the amplitude level, which shall be useful for dealing with these decay channels. If all higher $|(Q\bar{Q'})[n]\rangle$ quarkonium states decay to the ground state $|(Q\bar{Q'})[1^1S_0]\rangle$ with $100\%$ efficiency via electromagnetic or hadronic interactions, we obtain $\Gamma{(Z^0\to |(c\bar{c})[1^1S_0]\rangle)}=1476$ KeV, $\Gamma{(Z^0\to |(b\bar{c})[1^1S_0]\rangle)}=1485$ KeV, $\Gamma{(Z^0\to |(b\bar{b})[1^1S_0]\rangle)}=127.5$ KeV. At the LHC and ILC with the luminosity ${\cal L}\propto 10^{34}cm^{-2}s^{-1}$, sizable heavy quarkonium events can be produced through $Z^0$ boson decays, i.e., about $5.9~\times10^{5}$ $(c\bar{c})$, $6.0~\times10^{5}$ $(b\bar{c})$ (or $(c\bar{b})$), $5.1~\times10^{4}$ $(b\bar{b})$ events per year can be obtained. |
2110.03590 | Matthew Sievert | Logan Antiporda, Joseph Bahder, Hasan Rahman, Matthew D. Sievert | Jet Drift and Collective Flow in Heavy-Ion Collisions | 52 pages, 18 figures | null | 10.1103/PhysRevD.105.054025 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the tomographic applications of a new phenomenon we dub "jet drift"
-- the deflection of high-energy particles and jets toward the direction of a
flowing medium -- to the quark-gluon plasma produced in heavy-ion collisions.
While the physics of jet drift is quite general, for specificity we consider
the case of photon-jet production at mid-rapidity. Beginning with the simplest
possible model, a large slab of uniformly flowing plasma, we systematically
introduce the geometrical elements of a heavy-ion collision in a simple optical
Glauber model. We find that the moving medium causes the jet to drift in the
direction of the flow, bending its trajectory and leaving detailed signatures
of the flow pattern in the distribution of $\gamma + \: \mathrm{jet}$
acoplanarities. In the elliptical geometries produced in non-central
collisions, this drift effect leads to a strong geometry coupling which
persists despite the addition of event-by-event fluctuations in the jet
production point, impact parameter, and acoplanarity. We propose a new
observable to measure the jet drift effect through the correlation of $\gamma +
\: \mathrm{jet}$ acoplanarities with the elliptic flow of soft particles.
Preliminary estimates suggest this correlation may be studied at sPHENIX and
the LHC.
| [
{
"created": "Thu, 7 Oct 2021 16:15:23 GMT",
"version": "v1"
}
] | 2022-04-06 | [
[
"Antiporda",
"Logan",
""
],
[
"Bahder",
"Joseph",
""
],
[
"Rahman",
"Hasan",
""
],
[
"Sievert",
"Matthew D.",
""
]
] | We study the tomographic applications of a new phenomenon we dub "jet drift" -- the deflection of high-energy particles and jets toward the direction of a flowing medium -- to the quark-gluon plasma produced in heavy-ion collisions. While the physics of jet drift is quite general, for specificity we consider the case of photon-jet production at mid-rapidity. Beginning with the simplest possible model, a large slab of uniformly flowing plasma, we systematically introduce the geometrical elements of a heavy-ion collision in a simple optical Glauber model. We find that the moving medium causes the jet to drift in the direction of the flow, bending its trajectory and leaving detailed signatures of the flow pattern in the distribution of $\gamma + \: \mathrm{jet}$ acoplanarities. In the elliptical geometries produced in non-central collisions, this drift effect leads to a strong geometry coupling which persists despite the addition of event-by-event fluctuations in the jet production point, impact parameter, and acoplanarity. We propose a new observable to measure the jet drift effect through the correlation of $\gamma + \: \mathrm{jet}$ acoplanarities with the elliptic flow of soft particles. Preliminary estimates suggest this correlation may be studied at sPHENIX and the LHC. |
2307.08610 | Soo-hyeon Nam | Yeong Gyun Kim, Kang Young Lee, and Soo-hyeon Nam | Search for Light Dark Photon in the Forward Experiments at the LHC | 8 pages, 2 figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate detection possibility of light dark photon in the forward
experiments at the LHC, such as the SND@LHC and the FASER experiments. We
assume that the dark photon mass is smaller than twice of the electron mass.
Then the dark photon is long-lived and copiously produced through a neutral
pion decay. Such dark photons would easily pass through 100 m of rock in front
of the forward experiments and the detector targets, but some portion of them
could be converted into an electron-positron pair inside the detector leaving
an isolated electromagnetic shower as a new physics signature of the dark
photon. Our estimation shows that in the range of kinetic mixing parameter
$4\times10^{-5} \lesssim \epsilon \lesssim 2\times10^{-1}$, more than 10 signal
events of the dark photon can be produced assuming 150 fb$^{-1}$ integrated
luminosity.
| [
{
"created": "Mon, 17 Jul 2023 16:22:27 GMT",
"version": "v1"
}
] | 2023-07-18 | [
[
"Kim",
"Yeong Gyun",
""
],
[
"Lee",
"Kang Young",
""
],
[
"Nam",
"Soo-hyeon",
""
]
] | We investigate detection possibility of light dark photon in the forward experiments at the LHC, such as the SND@LHC and the FASER experiments. We assume that the dark photon mass is smaller than twice of the electron mass. Then the dark photon is long-lived and copiously produced through a neutral pion decay. Such dark photons would easily pass through 100 m of rock in front of the forward experiments and the detector targets, but some portion of them could be converted into an electron-positron pair inside the detector leaving an isolated electromagnetic shower as a new physics signature of the dark photon. Our estimation shows that in the range of kinetic mixing parameter $4\times10^{-5} \lesssim \epsilon \lesssim 2\times10^{-1}$, more than 10 signal events of the dark photon can be produced assuming 150 fb$^{-1}$ integrated luminosity. |
hep-ph/0502032 | Piotr Zenczykowski | M. Sowa, P. Zenczykowski | Combining Information from $B \to \pi \pi $ and $B \to \pi \rho, \pi
\omega $ Decays | 24 pages, revised | Phys.Rev.D71:114017,2005 | 10.1103/PhysRevD.71.114017 | null | hep-ph | null | We consider the $B \to \pi \pi $ and $B \to \pi \rho, \pi \omega $ decays
alongside each other, taking into account the contributions from all individual
penguin amplitudes generated by the internal $t$, $c$, and $u$ quarks. We argue
that three ratios of penguin amplitudes, each for a different internal quark,
formed by dividing the individual penguin amplitude in $B \to \pi \pi$ by the
corresponding amplitude in $B \to \pi \rho, \pi \omega $, should be equal. We
study the implications of the assumed existence of this connection between
$B\to \pi \pi$ and $B \to \pi \rho, \pi \omega $.
First, accepting that in the $B \to \pi \pi$ decays the ratio $C/T$ of the
colour-suppressed factorization amplitude $C$ to the tree factorization
amplitude $T$ is negligible, we determine the ratio of individual penguin
amplitudes. Then, from the $B \to \pi \rho, \pi \omega$ data, we extract the
effective (i.e. possibly containing some penguin terms) tree and the effective
colour-suppressed amplitudes relevant for these processes, and the
corresponding solutions for the factorization amplitudes. Finally, we argue
that the $C/T$ ratio in $B \to \pi \pi $ should be identical to its counterpart
in $B \to \pi \rho, \pi \omega$ (relevant for pion emission from the decaying
$b$ quark). This constraint permits the determination of $C/T$ and of other
amplitude ratios directly from the data. Although the $|C/T|$ ratio extracted
from the available data still carries a substantial error, it is consistent
with the expected value of 0.25 - 0.5.
| [
{
"created": "Thu, 3 Feb 2005 09:31:25 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Feb 2005 10:07:40 GMT",
"version": "v2"
},
{
"created": "Mon, 30 May 2005 09:25:42 GMT",
"version": "v3"
}
] | 2011-07-19 | [
[
"Sowa",
"M.",
""
],
[
"Zenczykowski",
"P.",
""
]
] | We consider the $B \to \pi \pi $ and $B \to \pi \rho, \pi \omega $ decays alongside each other, taking into account the contributions from all individual penguin amplitudes generated by the internal $t$, $c$, and $u$ quarks. We argue that three ratios of penguin amplitudes, each for a different internal quark, formed by dividing the individual penguin amplitude in $B \to \pi \pi$ by the corresponding amplitude in $B \to \pi \rho, \pi \omega $, should be equal. We study the implications of the assumed existence of this connection between $B\to \pi \pi$ and $B \to \pi \rho, \pi \omega $. First, accepting that in the $B \to \pi \pi$ decays the ratio $C/T$ of the colour-suppressed factorization amplitude $C$ to the tree factorization amplitude $T$ is negligible, we determine the ratio of individual penguin amplitudes. Then, from the $B \to \pi \rho, \pi \omega$ data, we extract the effective (i.e. possibly containing some penguin terms) tree and the effective colour-suppressed amplitudes relevant for these processes, and the corresponding solutions for the factorization amplitudes. Finally, we argue that the $C/T$ ratio in $B \to \pi \pi $ should be identical to its counterpart in $B \to \pi \rho, \pi \omega$ (relevant for pion emission from the decaying $b$ quark). This constraint permits the determination of $C/T$ and of other amplitude ratios directly from the data. Although the $|C/T|$ ratio extracted from the available data still carries a substantial error, it is consistent with the expected value of 0.25 - 0.5. |
hep-ph/0207075 | Davor Palle | D. Palle | On heavy Majorana neutrinos as a source of the highest energy cosmic
rays | LaTeX2e style, 11 pages, 3 figures; two typos corrected | Nuovo Cim.B118:747-752,2003 | 10.1393/ncb/i2002-10010-5 | null | hep-ph hep-ex hep-th | null | Cosmic ray events beyond the Greisen-Zatsepin-Kuzmin cut-off represent a
great challenge for particle physics and cosmology. We show that the physics of
heavy Majorana neutrinos, well defined by their masses, cross sections and
lifetimes, could explain the highest energy cosmic rays as a consequence of the
galactic annihilation of heavy neutrinos as cold dark matter particles.
Galactic nuclei accelerators, colliding neutron stars (black holes) or shocks
from the collapsed objects could produce ultra high energy cosmic rays as heavy
neutrinos beyond the mass threshold at an arbitrary cosmic distance. We comment
and also analyse the DAMA results with regard to heavy neutrinos as galactic
halo CDM particles.
| [
{
"created": "Thu, 4 Jul 2002 14:33:27 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jul 2002 13:06:23 GMT",
"version": "v2"
}
] | 2010-11-11 | [
[
"Palle",
"D.",
""
]
] | Cosmic ray events beyond the Greisen-Zatsepin-Kuzmin cut-off represent a great challenge for particle physics and cosmology. We show that the physics of heavy Majorana neutrinos, well defined by their masses, cross sections and lifetimes, could explain the highest energy cosmic rays as a consequence of the galactic annihilation of heavy neutrinos as cold dark matter particles. Galactic nuclei accelerators, colliding neutron stars (black holes) or shocks from the collapsed objects could produce ultra high energy cosmic rays as heavy neutrinos beyond the mass threshold at an arbitrary cosmic distance. We comment and also analyse the DAMA results with regard to heavy neutrinos as galactic halo CDM particles. |
1403.2040 | Yi Liao | Ran Ding, Zhi-Long Han, Yi Liao, Hong-Jun Liu, Ji-Yuan Liu | Phenomenology in Minimal Cascade Seesaw for Neutrino Mass | v1: 48 pages, including 18 figures and 10 tables; v2: version to
appear in PRD, 50 pages, including 19 figures and 10 tables, changes are: (1)
detailed discussion of LFV constraints on parameters together with a new
figure (Fig. 3); (2) more refs; (3) typos and grammatical issues fixed | Phys. Rev. D 89 (2014) 115024 | 10.1103/PhysRevD.89.115024 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We make a comprehensive analysis on the phenomenology in the minimal version
of cascade seesaw for tiny neutrino mass. The seesaw induces at tree level a
neutrino mass operator at dimension nine, by introducing a quadruple scalar
$\Phi$ of hypercharge unity and a quintuple fermion $\Sigma$ of hypercharge
zero. We work in a framework that handles the complicated Yukawa couplings in a
nice way without losing generality. All mixing matrices are essentially
expressed in terms of the vacuum expectation value of the quadruple scalar
v_\Phi, a free complex parameter, and known neutrino parameters. We show that
the low-energy lepton flavor violating transitions of the charged leptons set
strong constraints on the free parameters. The constraints have a significant
impact on collider physics, and are incorporated in our signal analysis at the
LHC. We investigate the signatures of new particles by surveying all
potentially important channels. We find that the 4j2\ell^\pm signal is most
important for the detection of the scalars and the 2\ell^{\pm}2\ell^{\mp}2j,
3\ell^{\pm}\ell^{\mp}2j and 3\ell^{\pm}2\ell^{\mp}+\cancel{E_T} signals are
quite promising for the fermions.
| [
{
"created": "Sun, 9 Mar 2014 09:51:10 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Jun 2014 00:35:08 GMT",
"version": "v2"
}
] | 2014-12-04 | [
[
"Ding",
"Ran",
""
],
[
"Han",
"Zhi-Long",
""
],
[
"Liao",
"Yi",
""
],
[
"Liu",
"Hong-Jun",
""
],
[
"Liu",
"Ji-Yuan",
""
]
] | We make a comprehensive analysis on the phenomenology in the minimal version of cascade seesaw for tiny neutrino mass. The seesaw induces at tree level a neutrino mass operator at dimension nine, by introducing a quadruple scalar $\Phi$ of hypercharge unity and a quintuple fermion $\Sigma$ of hypercharge zero. We work in a framework that handles the complicated Yukawa couplings in a nice way without losing generality. All mixing matrices are essentially expressed in terms of the vacuum expectation value of the quadruple scalar v_\Phi, a free complex parameter, and known neutrino parameters. We show that the low-energy lepton flavor violating transitions of the charged leptons set strong constraints on the free parameters. The constraints have a significant impact on collider physics, and are incorporated in our signal analysis at the LHC. We investigate the signatures of new particles by surveying all potentially important channels. We find that the 4j2\ell^\pm signal is most important for the detection of the scalars and the 2\ell^{\pm}2\ell^{\mp}2j, 3\ell^{\pm}\ell^{\mp}2j and 3\ell^{\pm}2\ell^{\mp}+\cancel{E_T} signals are quite promising for the fermions. |
hep-ph/9812304 | Jeff Forshaw | J.R.Forshaw, G.P.Salam and R.S.Thorne | BFKL at next-to-leading order | 6 pages, 2 figures | J.Phys.G25:1495-1500,1999 | 10.1088/0954-3899/25/7/333 | MC-TH-98/23 | hep-ph | null | This is a summary of the contributions on the next-to-leading order
corrections to the BFKL equation which were presented to the `Small-x and
Diffraction' working group at the 1998 Durham Workshop on HERA Physics.
| [
{
"created": "Wed, 9 Dec 1998 18:25:35 GMT",
"version": "v1"
}
] | 2010-03-25 | [
[
"Forshaw",
"J. R.",
""
],
[
"Salam",
"G. P.",
""
],
[
"Thorne",
"R. S.",
""
]
] | This is a summary of the contributions on the next-to-leading order corrections to the BFKL equation which were presented to the `Small-x and Diffraction' working group at the 1998 Durham Workshop on HERA Physics. |
1706.08543 | Xiaoyong Chu | Xiaoyong Chu, Suchita Kulkarni, Pierre Salati | Dark matter indirect signals with long-lived mediators | To match the published version | null | 10.1088/1475-7516/2017/11/023 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark matter particles could annihilate into light and metastable mediators
subsequently decaying far away from where they are produced. In this scenario,
the indirect signatures of dark matter are altered with respect to the
conventional situation where standard model particles are directly injected
where annihilation happens. We explore here this new phenomenology for which we
devise the tools. We calculate the effective dark matter distribution resulting
from the smearing by mediator propagation. We derive the fluxes of mediators
and their decay particles. We study how the $J$-factor, which naturally appears
in the calculation of the dark matter induced gamma ray signal, is modified in
the presence of mediators. We also derive the anisotropy which the cosmic ray
positron flux exhibits in this scenario. We finally comment upon a recent
proposal based on long-lived mediators where the effective dark matter density
at the Earth is increased such as to explain the cosmic ray positron anomaly.
We conclude that this scenario is barely tenable as regards the very dense dark
matter spike which it requires at the Galactic center. The associated positron
anisotropy is very small and undetectable, except at high energies where it
reaches a level of order $10^{-4}$ to $10^{-3}$.
| [
{
"created": "Mon, 26 Jun 2017 18:01:14 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jul 2017 16:04:29 GMT",
"version": "v2"
},
{
"created": "Sat, 25 Nov 2017 10:38:39 GMT",
"version": "v3"
}
] | 2017-11-29 | [
[
"Chu",
"Xiaoyong",
""
],
[
"Kulkarni",
"Suchita",
""
],
[
"Salati",
"Pierre",
""
]
] | Dark matter particles could annihilate into light and metastable mediators subsequently decaying far away from where they are produced. In this scenario, the indirect signatures of dark matter are altered with respect to the conventional situation where standard model particles are directly injected where annihilation happens. We explore here this new phenomenology for which we devise the tools. We calculate the effective dark matter distribution resulting from the smearing by mediator propagation. We derive the fluxes of mediators and their decay particles. We study how the $J$-factor, which naturally appears in the calculation of the dark matter induced gamma ray signal, is modified in the presence of mediators. We also derive the anisotropy which the cosmic ray positron flux exhibits in this scenario. We finally comment upon a recent proposal based on long-lived mediators where the effective dark matter density at the Earth is increased such as to explain the cosmic ray positron anomaly. We conclude that this scenario is barely tenable as regards the very dense dark matter spike which it requires at the Galactic center. The associated positron anisotropy is very small and undetectable, except at high energies where it reaches a level of order $10^{-4}$ to $10^{-3}$. |
2403.15543 | Lea Fu{\ss} | Lea Fu{\ss}, Mathias Garny, Alejandro Ibarra | Minimal decaying dark matter: from cosmological tensions to neutrino
signatures | 18 pages plus appendix, 12 figures | null | null | TUM-HEP-1502/24 | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | The invisible decay of cold dark matter into a slightly lighter dark sector
particle on cosmological time-scales has been proposed as a solution to the
$S_8$ tension. In this work we discuss the possible embedding of this scenario
within a particle physics framework, and we investigate its phenomenology. We
identify a minimal dark matter decay setup that addresses the $S_8$ tension,
while avoiding the stringent constraints from indirect dark matter searches. In
our scenario, the dark sector contains two singlet fermions $N_{1,2}$,
quasi-degenerate in mass, and carrying lepton number so that the heaviest state
($N_2$) decays into the lightest ($N_1$) and two neutrinos via a
higher-dimensional operator $N_2\to \bar N_1\nu\nu$. The conservation of lepton
number, and the small phase-space available for the decay, forbids the decay
channels into hadrons and strongly suppresses the decays into photons or
charged leptons. We derive complementary constraints on the model parameters
from neutrino detectors, freeze-in dark matter production via $\nu\nu\to
N_1N_2$, collider experiments and blazar observations, and we show that the
upcoming JUNO neutrino observatory could detect signals of dark matter decay
for model parameters addressing the $S_8$ tension if the dark matter mass is
below $\simeq 1$ GeV.
| [
{
"created": "Fri, 22 Mar 2024 18:00:09 GMT",
"version": "v1"
}
] | 2024-03-26 | [
[
"Fuß",
"Lea",
""
],
[
"Garny",
"Mathias",
""
],
[
"Ibarra",
"Alejandro",
""
]
] | The invisible decay of cold dark matter into a slightly lighter dark sector particle on cosmological time-scales has been proposed as a solution to the $S_8$ tension. In this work we discuss the possible embedding of this scenario within a particle physics framework, and we investigate its phenomenology. We identify a minimal dark matter decay setup that addresses the $S_8$ tension, while avoiding the stringent constraints from indirect dark matter searches. In our scenario, the dark sector contains two singlet fermions $N_{1,2}$, quasi-degenerate in mass, and carrying lepton number so that the heaviest state ($N_2$) decays into the lightest ($N_1$) and two neutrinos via a higher-dimensional operator $N_2\to \bar N_1\nu\nu$. The conservation of lepton number, and the small phase-space available for the decay, forbids the decay channels into hadrons and strongly suppresses the decays into photons or charged leptons. We derive complementary constraints on the model parameters from neutrino detectors, freeze-in dark matter production via $\nu\nu\to N_1N_2$, collider experiments and blazar observations, and we show that the upcoming JUNO neutrino observatory could detect signals of dark matter decay for model parameters addressing the $S_8$ tension if the dark matter mass is below $\simeq 1$ GeV. |
0910.0705 | D. J. Miller | P. Athron (1), S.F. King (2), D.J. Miller (3), S. Moretti (2 and 4),
R. Nevzorov (3) ((1) TU Dresden, (2) University of Southampton, (3)
University of Glasgow, (4) Turin University) | The constrained E6SSM | To appear in proceedings of The 2009 Europhysics Conference on High
Energy Physics, 16-22 July 2009 Krakow, Poland; 4 pages | PoS EPS-HEP2009:249,2009 | null | SHEP-09-24, DFTT 64/2009 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the predictions of a constrained version of the exceptional
supersymmetric standard model (cE6SSM), with a universal high energy soft
scalar mass, soft trilinear coupling and soft gaugino mass. The spectrum
includes a light gluino, a light wino-like neutralino and chargino pair and a
light bino-like neutralino, with other sparticle masses except the lighter stop
being much heavier. We also discuss scenarios with an extra light exotic colour
triplet of fermions and scalars and a TeV scale Z', which lead to early exotic
physics signals at the LHC.
| [
{
"created": "Mon, 5 Oct 2009 09:59:33 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Athron",
"P.",
"",
"2 and 4"
],
[
"King",
"S. F.",
"",
"2 and 4"
],
[
"Miller",
"D. J.",
"",
"2 and 4"
],
[
"Moretti",
"S.",
"",
"2 and 4"
],
[
"Nevzorov",
"R.",
""
]
] | We discuss the predictions of a constrained version of the exceptional supersymmetric standard model (cE6SSM), with a universal high energy soft scalar mass, soft trilinear coupling and soft gaugino mass. The spectrum includes a light gluino, a light wino-like neutralino and chargino pair and a light bino-like neutralino, with other sparticle masses except the lighter stop being much heavier. We also discuss scenarios with an extra light exotic colour triplet of fermions and scalars and a TeV scale Z', which lead to early exotic physics signals at the LHC. |
hep-ph/9506261 | null | K.S. Babu and S.M. Barr (Bartol Research Institute) | Proton decay and realistic models of quark and lepton masses | 24 pages (includes LaTeX figures) | Phys.Lett.B381:137-146,1996 | 10.1016/0370-2693(96)00536-9 | BA-95-21 | hep-ph | null | It is shown that in realistic SUSY GUT models of quark and lepton masses both
the proton decay rate and branching ratios differ in general from those
predicted in the minimal $SU(5)$ supersymmetric model. The observation of
proton decay, and in particular the branching ratio $B[(p \rightarrow \pi^+
\overline{\nu})/(p \rightarrow K^+ \overline{\nu})]$, would thus allow decisive
tests of these fermion mass schemes. It is shown that the charged lepton decay
modes $p \rightarrow K^0 \mu^+, p \rightarrow K^0 e^+$ arising through gluino
dressing diagrams are significant and comparable to the neutrino modes in large
tan$\beta$ models. Moreover, it is found that in certain classes of models the
Higgsino-mediated proton decay amplitudes are proportional to a model-dependent
group-theoretical factor which in some cases can be quite small. The most
interesting such class consists of $SO(10)$ models in which the dominant
flavor-symmetric contribution to the up-quark mass matrix comes from an
effective operator of the form ${\bf 16}_i{\bf 16}_j {\bf 10}_H {\bf 45}_H$,
where $\langle {\bf 45}_H \rangle$ points approximately in the $I_{3R}$
direction. This class includes a recent model of quark and lepton masses
proposed by the authors.
| [
{
"created": "Wed, 7 Jun 1995 18:50:34 GMT",
"version": "v1"
}
] | 2011-05-12 | [
[
"Babu",
"K. S.",
"",
"Bartol Research Institute"
],
[
"Barr",
"S. M.",
"",
"Bartol Research Institute"
]
] | It is shown that in realistic SUSY GUT models of quark and lepton masses both the proton decay rate and branching ratios differ in general from those predicted in the minimal $SU(5)$ supersymmetric model. The observation of proton decay, and in particular the branching ratio $B[(p \rightarrow \pi^+ \overline{\nu})/(p \rightarrow K^+ \overline{\nu})]$, would thus allow decisive tests of these fermion mass schemes. It is shown that the charged lepton decay modes $p \rightarrow K^0 \mu^+, p \rightarrow K^0 e^+$ arising through gluino dressing diagrams are significant and comparable to the neutrino modes in large tan$\beta$ models. Moreover, it is found that in certain classes of models the Higgsino-mediated proton decay amplitudes are proportional to a model-dependent group-theoretical factor which in some cases can be quite small. The most interesting such class consists of $SO(10)$ models in which the dominant flavor-symmetric contribution to the up-quark mass matrix comes from an effective operator of the form ${\bf 16}_i{\bf 16}_j {\bf 10}_H {\bf 45}_H$, where $\langle {\bf 45}_H \rangle$ points approximately in the $I_{3R}$ direction. This class includes a recent model of quark and lepton masses proposed by the authors. |
1202.2242 | Anatoly Kotikov Vassilievich | Bernd A. Kniehl, Anatoly V. Kotikov | Counting master integrals: integration-by-parts procedure with effective
mass | 4 pages, more general formula and figure are included, accepted for
publication in Phys.Lett.B | null | 10.1016/j.physletb.2012.04.071 | DESY 12-024 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the new relation between master integrals recently obtained in
Ref. [1] can be reproduced using the integration-by-parts technique implemented
with an effective mass. In fact, this relation is recovered as a special case
of a whole family of new relations between master integrals.
| [
{
"created": "Fri, 10 Feb 2012 12:07:59 GMT",
"version": "v1"
},
{
"created": "Tue, 1 May 2012 11:18:13 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Kniehl",
"Bernd A.",
""
],
[
"Kotikov",
"Anatoly V.",
""
]
] | We show that the new relation between master integrals recently obtained in Ref. [1] can be reproduced using the integration-by-parts technique implemented with an effective mass. In fact, this relation is recovered as a special case of a whole family of new relations between master integrals. |
1608.01994 | Tongyan Lin | Yonit Hochberg, Tongyan Lin, and Kathryn M. Zurek | Absorption of light dark matter in semiconductors | 6 pages, 3 figures; journal version | Phys. Rev. D 95, 023013 (2017) | 10.1103/PhysRevD.95.023013 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Semiconductors are by now well-established targets for direct detection of
MeV to GeV dark matter via scattering off electrons. We show that semiconductor
targets can also detect significantly lighter dark matter via an absorption
process. When the dark matter mass is above the band gap of the semiconductor
(around an eV), absorption proceeds by excitation of an electron into the
conduction band. Below the band gap, multi-phonon excitations enable absorption
of dark matter in the 0.01 eV to eV mass range. Energetic dark matter particles
emitted from the sun can also be probed for masses below an eV. We derive the
reach for absorption of a relic kinetically mixed dark photon or pseudoscalar
in germanium and silicon, and show that existing direct detection results
already probe new parameter space. With only a moderate exposure, low-threshold
semiconductor target experiments can exceed current astrophysical and
terrestrial constraints on sub-keV bosonic dark matter.
| [
{
"created": "Fri, 5 Aug 2016 20:00:00 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Apr 2017 01:58:48 GMT",
"version": "v2"
}
] | 2017-04-17 | [
[
"Hochberg",
"Yonit",
""
],
[
"Lin",
"Tongyan",
""
],
[
"Zurek",
"Kathryn M.",
""
]
] | Semiconductors are by now well-established targets for direct detection of MeV to GeV dark matter via scattering off electrons. We show that semiconductor targets can also detect significantly lighter dark matter via an absorption process. When the dark matter mass is above the band gap of the semiconductor (around an eV), absorption proceeds by excitation of an electron into the conduction band. Below the band gap, multi-phonon excitations enable absorption of dark matter in the 0.01 eV to eV mass range. Energetic dark matter particles emitted from the sun can also be probed for masses below an eV. We derive the reach for absorption of a relic kinetically mixed dark photon or pseudoscalar in germanium and silicon, and show that existing direct detection results already probe new parameter space. With only a moderate exposure, low-threshold semiconductor target experiments can exceed current astrophysical and terrestrial constraints on sub-keV bosonic dark matter. |
1612.05503 | Vladimir Tello | Goran Senjanovi\'c, Vladimir Tello | Probing Seesaw with Parity Restoration | null | Phys. Rev. Lett. 119, 201803 (2017) | 10.1103/PhysRevLett.119.201803 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a novel way of testing the seesaw origin of neutrino mass in the
context of the minimal Left-Right Symmetric Model. It is based on the
connection between the leptonic interactions of the doubly charged scalars,
whose presence is at the core of the seesaw mechanism, and the neutrino Dirac
Yukawa couplings which govern, among other processes, the right-handed neutrino
decays into left-handed charged leptons. We prove that any physical quantity
depending on these couplings is a function of the hermitian part only which can
significantly simplify their future experimental determination.
| [
{
"created": "Fri, 16 Dec 2016 15:10:47 GMT",
"version": "v1"
}
] | 2017-11-22 | [
[
"Senjanović",
"Goran",
""
],
[
"Tello",
"Vladimir",
""
]
] | We present a novel way of testing the seesaw origin of neutrino mass in the context of the minimal Left-Right Symmetric Model. It is based on the connection between the leptonic interactions of the doubly charged scalars, whose presence is at the core of the seesaw mechanism, and the neutrino Dirac Yukawa couplings which govern, among other processes, the right-handed neutrino decays into left-handed charged leptons. We prove that any physical quantity depending on these couplings is a function of the hermitian part only which can significantly simplify their future experimental determination. |
2007.09143 | Tetiana Obikhod Victorovna | Tetiana Obikhod, Ievgenii Petrenko | Searches for heavy Higgs bosons in the framework of 2HDM model | 7 pages, 5 figures | Phys.Part.Nucl. 54 (2023) 3, 400-404 | 10.1134/S1063779623030255 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The searches for heavy neutral and charged Higgs bosons are performed through
the calculations of production cross sections using MadGraph5aMC@NLO program
with ansatz of Yukawa coupling and the restricted parameter space connected
with LHC Run 2 data. The searches for heavy resonances are performed in the
framework of 2HDM model over the mass range 0.1 - 1 TeV for the $pp\rightarrow
At\bar{b}$, $pp\rightarrow H^{+}b\bar{t}$ , $pp\rightarrow H^{+}t\bar{t}$ ,
$pp\rightarrow HHZ$ decay modes. The presented data demonstrate the jump in the
production cross section of $H^{+} b\bar{t}$ and $HHZ$ production processes in
the mass range of 100-200 GeV and 100-300 GeV accordingly at energy of 14 TeV.
| [
{
"created": "Mon, 8 Jun 2020 18:19:13 GMT",
"version": "v1"
}
] | 2023-06-21 | [
[
"Obikhod",
"Tetiana",
""
],
[
"Petrenko",
"Ievgenii",
""
]
] | The searches for heavy neutral and charged Higgs bosons are performed through the calculations of production cross sections using MadGraph5aMC@NLO program with ansatz of Yukawa coupling and the restricted parameter space connected with LHC Run 2 data. The searches for heavy resonances are performed in the framework of 2HDM model over the mass range 0.1 - 1 TeV for the $pp\rightarrow At\bar{b}$, $pp\rightarrow H^{+}b\bar{t}$ , $pp\rightarrow H^{+}t\bar{t}$ , $pp\rightarrow HHZ$ decay modes. The presented data demonstrate the jump in the production cross section of $H^{+} b\bar{t}$ and $HHZ$ production processes in the mass range of 100-200 GeV and 100-300 GeV accordingly at energy of 14 TeV. |
2211.08967 | Federico Vazzoler | Federico Vazzoler, Simone Amoroso, Ekaterina Lipka, Clara Lavinia Del
Pio, Mauro Chiesa, Fulvio Piccinini, Alessandro Vicini | Probing the Weak Mixing Angle at high energies at the LHC | To appear in the Proceedings of the 41st International Conference on
High Energy physics - ICHEP2022, Bologna, Italy, 6-13 July, 2022 | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The electroweak mixing angle is a fundamental parameter of the theory of
electroweak interactions. Its value has been measured precisely at the
$\mathrm{Z}$-pole at colliders. In this contribution, we propose to exploit
measurements of Neutral-Current Drell-Yan production at the Large Hadron
Collider at large invariant dilepton masses to determine the energy scale
dependence (running) of the electroweak mixing angle in the $\bar{\text{MS}}$
renormalisation scheme, $\sin^2\theta_{W,\ell}^{\bar{\text{MS}}}(\mu)$. Such a
measurement can be used to confirm the Standard Model predictions for the
$\bar{\text{MS}}$ running at $\text{TeV}$ scales, and to set model-independent
constraints on new states with electroweak quantum numbers. To this end, we
make use of a dedicated implementation of
$\sin^2\theta_{W,\ell}^{\bar{\text{MS}}}(\mu)$ in the POWHEG-BOX-V2 Monte Carlo
event generator, which we use to explore the potential of future analyses using
the data of the LHC Run 3 and High-Luminosity.
| [
{
"created": "Wed, 16 Nov 2022 15:18:35 GMT",
"version": "v1"
}
] | 2022-11-17 | [
[
"Vazzoler",
"Federico",
""
],
[
"Amoroso",
"Simone",
""
],
[
"Lipka",
"Ekaterina",
""
],
[
"Del Pio",
"Clara Lavinia",
""
],
[
"Chiesa",
"Mauro",
""
],
[
"Piccinini",
"Fulvio",
""
],
[
"Vicini",
"Alessandro",
""
]
] | The electroweak mixing angle is a fundamental parameter of the theory of electroweak interactions. Its value has been measured precisely at the $\mathrm{Z}$-pole at colliders. In this contribution, we propose to exploit measurements of Neutral-Current Drell-Yan production at the Large Hadron Collider at large invariant dilepton masses to determine the energy scale dependence (running) of the electroweak mixing angle in the $\bar{\text{MS}}$ renormalisation scheme, $\sin^2\theta_{W,\ell}^{\bar{\text{MS}}}(\mu)$. Such a measurement can be used to confirm the Standard Model predictions for the $\bar{\text{MS}}$ running at $\text{TeV}$ scales, and to set model-independent constraints on new states with electroweak quantum numbers. To this end, we make use of a dedicated implementation of $\sin^2\theta_{W,\ell}^{\bar{\text{MS}}}(\mu)$ in the POWHEG-BOX-V2 Monte Carlo event generator, which we use to explore the potential of future analyses using the data of the LHC Run 3 and High-Luminosity. |
0909.0455 | Zhang He | Tommy Ohlsson, Thomas Schwetz, He Zhang | Non-standard neutrino interactions in the Zee-Babu model | 9 pages, 4 figures | Phys.Lett.B681:269-275,2009 | 10.1016/j.physletb.2009.10.025 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate non-standard neutrino interactions (NSIs) in the Zee--Babu
model. The size of NSIs predicted by this model is obtained from a full scan
over the parameter space, taking into account constraints from low-energy
experiments such as searches for lepton flavor violation (LFV) and the
requirement to obtain a viable neutrino mass matrix. The dependence on the
scale of new physics as well as on the type of the neutrino mass hierarchy is
discussed. We find that NSIs at the source of a future neutrino factory may be
at an observable level in the nu_e to nu_tau and/or nu_mu to nu_tau channels.
In particular, if the doubly charged scalar of the model has a mass in reach of
the LHC and if the neutrino mass hierarchy is inverted, a highly predictive
scenario is obtained with observable signals at the LHC, in upcoming neutrino
oscillation experiments, in LFV processes, and for NSIs at a neutrino factory.
| [
{
"created": "Wed, 2 Sep 2009 15:45:48 GMT",
"version": "v1"
}
] | 2009-11-18 | [
[
"Ohlsson",
"Tommy",
""
],
[
"Schwetz",
"Thomas",
""
],
[
"Zhang",
"He",
""
]
] | We investigate non-standard neutrino interactions (NSIs) in the Zee--Babu model. The size of NSIs predicted by this model is obtained from a full scan over the parameter space, taking into account constraints from low-energy experiments such as searches for lepton flavor violation (LFV) and the requirement to obtain a viable neutrino mass matrix. The dependence on the scale of new physics as well as on the type of the neutrino mass hierarchy is discussed. We find that NSIs at the source of a future neutrino factory may be at an observable level in the nu_e to nu_tau and/or nu_mu to nu_tau channels. In particular, if the doubly charged scalar of the model has a mass in reach of the LHC and if the neutrino mass hierarchy is inverted, a highly predictive scenario is obtained with observable signals at the LHC, in upcoming neutrino oscillation experiments, in LFV processes, and for NSIs at a neutrino factory. |
1605.00900 | Zhi-zhong Xing | Yu-Feng Li, Yifang Wang, Zhi-zhong Xing | Terrestrial matter effects on reactor antineutrino oscillations at JUNO
or RENO-50: how small is small? | LaTex 16 pages, 7 figures, more discussions and references added.
Accepted for publication in Chinese Physics C | null | 10.1088/1674-1137/40/9/091001 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have carefully examined, in both analytical and numerical ways, how small
the terrestrial matter effects can be in a given medium-baseline reactor
antineutrino oscillation experiment like JUNO or RENO-50. Taking the ongoing
JUNO experiment for example, we show that the inclusion of terrestrial matter
effects may reduce the sensitivity of the neutrino mass ordering measurement by
\Delta \chi^2_{\rm MO} \simeq 0.6, and a neglect of such effects may shift the
best-fit values of the flavor mixing angle \theta_{12} and the neutrino
mass-squared difference \Delta_{21} by about 1\sigma to 2\sigma in the future
data analysis. In addition, a preliminary estimate indicates that a 2\sigma
sensitivity of establishing the terrestrial matter effects can be achieved for
about 10 years of data taking at JUNO with the help of a proper near detector
implementation.
| [
{
"created": "Tue, 3 May 2016 13:35:39 GMT",
"version": "v1"
},
{
"created": "Sun, 15 May 2016 01:42:09 GMT",
"version": "v2"
}
] | 2016-09-21 | [
[
"Li",
"Yu-Feng",
""
],
[
"Wang",
"Yifang",
""
],
[
"Xing",
"Zhi-zhong",
""
]
] | We have carefully examined, in both analytical and numerical ways, how small the terrestrial matter effects can be in a given medium-baseline reactor antineutrino oscillation experiment like JUNO or RENO-50. Taking the ongoing JUNO experiment for example, we show that the inclusion of terrestrial matter effects may reduce the sensitivity of the neutrino mass ordering measurement by \Delta \chi^2_{\rm MO} \simeq 0.6, and a neglect of such effects may shift the best-fit values of the flavor mixing angle \theta_{12} and the neutrino mass-squared difference \Delta_{21} by about 1\sigma to 2\sigma in the future data analysis. In addition, a preliminary estimate indicates that a 2\sigma sensitivity of establishing the terrestrial matter effects can be achieved for about 10 years of data taking at JUNO with the help of a proper near detector implementation. |
hep-ph/9901442 | Francesco Murgia | Mauro Anselmino (1), Maria Boglione (2), Francesco Murgia (3) ((1)
University and INFN, Torino, Italy, (2) Vrije Universiteit, Amsterdam, The
Netherlands, (3) INFN and University, Cagliari, Italy) | Phenomenology of single spin asymmetries in p(transv. polarized)-p ->
pion + X | 20+1 pages, LaTeX, 6 eps figures, uses epsfig.sty. Version v2: Some
sentences rephrased and comments added throughout the paper; one reference
added; no changes in results and figures. Final version to be published in
Phys. Rev. D | Phys.Rev.D60:054027,1999 | 10.1103/PhysRevD.60.054027 | DFTT 04/99, VUTH 99-02, INFNCA-TH9902 | hep-ph | null | A phenomenological description of single transverse spin effects in
hadron-hadron inclusive processes is proposed, assuming a generalized
factorization scheme and pQCD hard interactions. The transverse momentum, k_T,
of the quarks inside the hadrons and of the hadrons relatively to the
fragmenting quark, is taken into account in distribution and fragmentation
functions, and leads to possible non zero single spin asymmetries. The role of
k_T and spin dependent quark fragmentations -- the so-called Collins effect --
is investigated in details in p(transv. polarized)-p -> pion + X processes: it
is shown how the experimental data could be described, obtaining an explicit
expression for the spin asymmetry of a polarized fragmenting quark, on which
some comments are made. Predictions for other processes, possible further
applications and experimental tests are discussed.
| [
{
"created": "Thu, 28 Jan 1999 17:44:20 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Jun 1999 10:45:43 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Anselmino",
"Mauro",
""
],
[
"Boglione",
"Maria",
""
],
[
"Murgia",
"Francesco",
""
]
] | A phenomenological description of single transverse spin effects in hadron-hadron inclusive processes is proposed, assuming a generalized factorization scheme and pQCD hard interactions. The transverse momentum, k_T, of the quarks inside the hadrons and of the hadrons relatively to the fragmenting quark, is taken into account in distribution and fragmentation functions, and leads to possible non zero single spin asymmetries. The role of k_T and spin dependent quark fragmentations -- the so-called Collins effect -- is investigated in details in p(transv. polarized)-p -> pion + X processes: it is shown how the experimental data could be described, obtaining an explicit expression for the spin asymmetry of a polarized fragmenting quark, on which some comments are made. Predictions for other processes, possible further applications and experimental tests are discussed. |
hep-ph/9909249 | Ernest Ma | Ernest Ma (UC Riverside) | Permutation Symmetry for Neutrino and Charged-Lepton Mass Matrices | 13 pages including 1 figure | Phys.Rev. D61 (2000) 033012 | 10.1103/PhysRevD.61.033012 | UCRHEP-T262 (Sep 99) | hep-ph | null | The permutation symmetry $S_3$ is appplied to obtain two equal Majorana
neutrino masses, while maintaining three different charged-lepton masses and
suppressing neutrinoless double beta decay. The resulting radiative splitting
of the two neutrinos is shown to be suitable for solar neutrino vacuum
oscillations.
| [
{
"created": "Fri, 3 Sep 1999 18:31:03 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Ma",
"Ernest",
"",
"UC Riverside"
]
] | The permutation symmetry $S_3$ is appplied to obtain two equal Majorana neutrino masses, while maintaining three different charged-lepton masses and suppressing neutrinoless double beta decay. The resulting radiative splitting of the two neutrinos is shown to be suitable for solar neutrino vacuum oscillations. |
2312.10711 | Hanqing Zheng | Ye Lu, Chang Chen, Guang-you Qin, Han-Qing Zheng | A discussion on the anomalous threshold enhancement of $J/\psi$ --
$\psi(3770)$ couplings and $X(6900)$ peak | 6 pages, 5 figures | null | null | null | hep-ph hep-ex | http://creativecommons.org/publicdomain/zero/1.0/ | The attractive interaction between $J/\psi$ and $\psi(3770)$ has to be strong
enough to form the molecular resonant structure, i.e., $X(6900)$. We argue that
since $\psi(3770)$ decays predominantly into a $D\bar D$ pair, the interactions
between $J/\psi$ and $\psi(3770)$ may be significantly enhanced due to the
three point $D\bar D$ loop diagram. The enhancement comes from the anomalous
threshold located at $t=-1.288$GeV$^2$, which effect propagates into the
$s$-channel partial wave amplitude in the vicinity of $\sqrt{s}\simeq 6.9$GeV.
This effect may be helpful in forming the $X(6900)$ peak.
| [
{
"created": "Sun, 17 Dec 2023 13:00:17 GMT",
"version": "v1"
}
] | 2023-12-19 | [
[
"Lu",
"Ye",
""
],
[
"Chen",
"Chang",
""
],
[
"Qin",
"Guang-you",
""
],
[
"Zheng",
"Han-Qing",
""
]
] | The attractive interaction between $J/\psi$ and $\psi(3770)$ has to be strong enough to form the molecular resonant structure, i.e., $X(6900)$. We argue that since $\psi(3770)$ decays predominantly into a $D\bar D$ pair, the interactions between $J/\psi$ and $\psi(3770)$ may be significantly enhanced due to the three point $D\bar D$ loop diagram. The enhancement comes from the anomalous threshold located at $t=-1.288$GeV$^2$, which effect propagates into the $s$-channel partial wave amplitude in the vicinity of $\sqrt{s}\simeq 6.9$GeV. This effect may be helpful in forming the $X(6900)$ peak. |
1410.4844 | Skokov Vladimir | Adrian Dumitru, Larry McLerran, Vladimir Skokov | Azimuthal asymmetries and the emergence of "collectivity" from
multi-particle correlations in high-energy pA collisions | 6 pages; version accepted to Phys. Let. B | null | 10.1016/j.physletb.2015.02.046 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show how angular asymmetries $\sim\cos 2\phi$ can arise in dipole
scattering at high energies. We illustrate the effects due to anisotropic
fluctuations of the saturation momentum of the target with a finite correlation
length in the transverse impact parameter plane, i.e.\ from a domain-like
structure. We compute the two-particle azimuthal cumulant in this model
including both one-particle factorizable as well as genuine two-particle
non-factorizable contributions to the two-particle cross section. We also
compute the full BBGKY hierarchy for the four-particle azimuthal cumulant and
find that only the fully factorizable contribution to $c_2\{4\}$ is negative
while all contributions from genuine two, three and four-particle correlations
are positive. Our results may provide some qualitative insight into the origin
of azimuthal asymmetries in p+Pb collisions at the LHC which reveal a change of
sign of $c_2\{4\}$ in high-multiplicity events.
| [
{
"created": "Fri, 17 Oct 2014 20:00:06 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Mar 2015 02:06:37 GMT",
"version": "v2"
}
] | 2015-06-23 | [
[
"Dumitru",
"Adrian",
""
],
[
"McLerran",
"Larry",
""
],
[
"Skokov",
"Vladimir",
""
]
] | We show how angular asymmetries $\sim\cos 2\phi$ can arise in dipole scattering at high energies. We illustrate the effects due to anisotropic fluctuations of the saturation momentum of the target with a finite correlation length in the transverse impact parameter plane, i.e.\ from a domain-like structure. We compute the two-particle azimuthal cumulant in this model including both one-particle factorizable as well as genuine two-particle non-factorizable contributions to the two-particle cross section. We also compute the full BBGKY hierarchy for the four-particle azimuthal cumulant and find that only the fully factorizable contribution to $c_2\{4\}$ is negative while all contributions from genuine two, three and four-particle correlations are positive. Our results may provide some qualitative insight into the origin of azimuthal asymmetries in p+Pb collisions at the LHC which reveal a change of sign of $c_2\{4\}$ in high-multiplicity events. |
2407.13319 | Zhongyu Wang | Zhong-Yu Wang, Chu-Wen Xiao, Zhi-Feng Sun, and Xiang Liu | Possible molecules of triple-heavy pentaquarks within the extended local
hidden gauge formalism | 15 pages, 3 figures, add more references | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study, we explore the interactions between mesons and baryons in the
open heavy sectors to identify potential triple-heavy molecular pentaquarks. We
derive the meson-baryon interaction potentials using the vector meson exchange
mechanism within the extended local hidden gauge formalism. The scattering
amplitudes are computed by solving the coupled-channel Bethe-Salpeter equation,
revealing several bound systems. By analyzing the poles of these amplitudes in
the complex plane, we determine the masses and widths of these bound states.
Additionally, we evaluate the couplings and compositeness of different channels
within each bound system to assess their molecular characteristics. Our
predictions include four $\Omega_{ccc}$-like states, four $\Omega_{bbb}$-like
states, fourteen $\Omega_{bcc}$-like states, and ten $\Omega_{bbc}$-like
states, which could be targets for future experimental investigations.
| [
{
"created": "Thu, 18 Jul 2024 09:19:57 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jul 2024 08:57:29 GMT",
"version": "v2"
}
] | 2024-07-26 | [
[
"Wang",
"Zhong-Yu",
""
],
[
"Xiao",
"Chu-Wen",
""
],
[
"Sun",
"Zhi-Feng",
""
],
[
"Liu",
"Xiang",
""
]
] | In this study, we explore the interactions between mesons and baryons in the open heavy sectors to identify potential triple-heavy molecular pentaquarks. We derive the meson-baryon interaction potentials using the vector meson exchange mechanism within the extended local hidden gauge formalism. The scattering amplitudes are computed by solving the coupled-channel Bethe-Salpeter equation, revealing several bound systems. By analyzing the poles of these amplitudes in the complex plane, we determine the masses and widths of these bound states. Additionally, we evaluate the couplings and compositeness of different channels within each bound system to assess their molecular characteristics. Our predictions include four $\Omega_{ccc}$-like states, four $\Omega_{bbb}$-like states, fourteen $\Omega_{bcc}$-like states, and ten $\Omega_{bbc}$-like states, which could be targets for future experimental investigations. |
1105.2765 | H\'ector Novales-S\'anchez | H. Novales-S\'anchez, J. J. Toscano | Integration of Kaluza-Klein modes in Yang-Mills theories | 17 pages, a new paragraph and some new equations were added | Phys.Rev.D84:076010,2011 | 10.1103/PhysRevD.84.076010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A five dimensional pure Yang--Mills theory, with the fifth coordinate
compactified on the orbifold $S^1/Z_2$ of radius R, leads to a four dimensional
theory which is governed by two types of local gauge transformations, namely,
the well known standard gauge transformations (SGT) dictated by the $SU_4(N)$
group under which the zero Fourier modes transform as gauge fields, and a set
of nonstandard gauge transformations (NSGT) determining the gauge nature of the
Kaluza--Klein (KK) excitations. By using a SGT-covariant gauge-fixing procedure
for removing the degeneration associated with the NSGT, we integrate out the KK
excitations and obtain a low-energy effective Lagrangian expansion involving
all of the independent canonical-dimension-six operators that are invariant
under the SGT of the $SU_4(N)$ group and that are constituted by light gauge
fields (zero modes), exclusively. It is shown that this effective Lagrangian is
invariant under the SGT, but it depends on the gauge-fixing of the gauge KK
excitations. Our result shows explicitly that the one-loop contributions of the
KK excitations to light (standard) Green's functions are renormalizable.
| [
{
"created": "Fri, 13 May 2011 16:17:23 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Nov 2011 02:57:03 GMT",
"version": "v2"
}
] | 2011-11-17 | [
[
"Novales-Sánchez",
"H.",
""
],
[
"Toscano",
"J. J.",
""
]
] | A five dimensional pure Yang--Mills theory, with the fifth coordinate compactified on the orbifold $S^1/Z_2$ of radius R, leads to a four dimensional theory which is governed by two types of local gauge transformations, namely, the well known standard gauge transformations (SGT) dictated by the $SU_4(N)$ group under which the zero Fourier modes transform as gauge fields, and a set of nonstandard gauge transformations (NSGT) determining the gauge nature of the Kaluza--Klein (KK) excitations. By using a SGT-covariant gauge-fixing procedure for removing the degeneration associated with the NSGT, we integrate out the KK excitations and obtain a low-energy effective Lagrangian expansion involving all of the independent canonical-dimension-six operators that are invariant under the SGT of the $SU_4(N)$ group and that are constituted by light gauge fields (zero modes), exclusively. It is shown that this effective Lagrangian is invariant under the SGT, but it depends on the gauge-fixing of the gauge KK excitations. Our result shows explicitly that the one-loop contributions of the KK excitations to light (standard) Green's functions are renormalizable. |
1112.2415 | Martin Holthausen | Martin Holthausen, Kher Sham Lim, and Manfred Lindner | Planck Scale Boundary Conditions and the Higgs Mass | 12 pages, 5 figures; references added and other minor improvements,
matches version published in JHEP | JHEP 1202 (2012) 037 | 10.1007/JHEP02(2012)037 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If the LHC does only find a Higgs boson in the low mass region and no other
new physics, then one should reconsider scenarios where the Standard Model with
three right-handed neutrinos is valid up to Planck scale. We assume in this
spirit that the Standard Model couplings are remnants of quantum gravity which
implies certain generic boundary conditions for the Higgs quartic coupling at
Planck scale. This leads to Higgs mass predictions at the electroweak scale via
renormalization group equations. We find that several physically well motivated
conditions yield a range of Higgs masses from 127-142 GeV. We also argue that a
random quartic Higgs coupling at the Planck scale favors M_H > 150 GeV, which
is clearly excluded. We discuss also the prospects for differentiating
different boundary conditions imposed for \lambda(M_{pl}) at the LHC. A
striking example is M_H = 127\pm 5 GeV corresponding to \lambda(M_{pl})=0,
which would imply that the quartic Higgs coupling at the electroweak scale is
entirely radiatively generated.
| [
{
"created": "Mon, 12 Dec 2011 00:03:03 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Mar 2012 12:46:36 GMT",
"version": "v2"
}
] | 2012-03-05 | [
[
"Holthausen",
"Martin",
""
],
[
"Lim",
"Kher Sham",
""
],
[
"Lindner",
"Manfred",
""
]
] | If the LHC does only find a Higgs boson in the low mass region and no other new physics, then one should reconsider scenarios where the Standard Model with three right-handed neutrinos is valid up to Planck scale. We assume in this spirit that the Standard Model couplings are remnants of quantum gravity which implies certain generic boundary conditions for the Higgs quartic coupling at Planck scale. This leads to Higgs mass predictions at the electroweak scale via renormalization group equations. We find that several physically well motivated conditions yield a range of Higgs masses from 127-142 GeV. We also argue that a random quartic Higgs coupling at the Planck scale favors M_H > 150 GeV, which is clearly excluded. We discuss also the prospects for differentiating different boundary conditions imposed for \lambda(M_{pl}) at the LHC. A striking example is M_H = 127\pm 5 GeV corresponding to \lambda(M_{pl})=0, which would imply that the quartic Higgs coupling at the electroweak scale is entirely radiatively generated. |
1707.00108 | Fatemeh Taghavi Shahri | Marzieh Mottaghizadeh, Fatemeh Taghavi Shahri, Parvin Eslami | Analytical solutions of the QCD$\otimes$QED DGLAP evolution equations
based on the Mellin transform technique in NLO approximation | null | Phys.\ Lett.\ B {\bf 773}, 375 (2017) | 10.1016/j.physletb.2017.08.049 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we present a new and efficient analytical solutions for
evolving the QED$\otimes$QCD DGLAP evolution equations in mellin space and
obtain the parton distribution functions (PDFs) in perturbative QCD including
the QED corrections. The validity of our analytical solutions, which have done
in the next to leading order QCD and the leading order QED approximations, are
checked with the initial parton distributions from newly released CT14QED
global analysis code (Phys. Rev.D93,114015(2016)). The evolved parton
distributions are in good agreement with CT14QED code and also with those from
APFEL (Computer Physics Communications 185, 1647 (2014)) program.
| [
{
"created": "Sat, 1 Jul 2017 07:44:15 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jul 2017 05:04:55 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Oct 2017 04:23:57 GMT",
"version": "v3"
}
] | 2017-10-04 | [
[
"Mottaghizadeh",
"Marzieh",
""
],
[
"Shahri",
"Fatemeh Taghavi",
""
],
[
"Eslami",
"Parvin",
""
]
] | In this paper we present a new and efficient analytical solutions for evolving the QED$\otimes$QCD DGLAP evolution equations in mellin space and obtain the parton distribution functions (PDFs) in perturbative QCD including the QED corrections. The validity of our analytical solutions, which have done in the next to leading order QCD and the leading order QED approximations, are checked with the initial parton distributions from newly released CT14QED global analysis code (Phys. Rev.D93,114015(2016)). The evolved parton distributions are in good agreement with CT14QED code and also with those from APFEL (Computer Physics Communications 185, 1647 (2014)) program. |
1707.04886 | Alexey Nefediev | Yu.S. Kalashnikova, A.V. Nefediev, J.E.F.T. Ribeiro | Chiral symmetry and the properties of hadrons in the Generalised
Nambu-Jona-Lasinio model | LaTeX2e, 53 pages, 9 figures, 4 tables, review paper published in
Phys.Usp., translation into Russian available in source package | Phys.Usp. 60 (2017) 667-693, Usp.Fiz.Nauk 187 (2017) 715-743 | 10.3367/UFNe.2016.11.037966 | null | hep-ph hep-lat hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Various aspects of the Generalised Nambu-Jona-Lasinio model for QCD in four
dimensions are reviewed. The properties of mesonic excitations are discussed in
detail, with special attention paid to the chiral pion. The spontaneous chiral
symmetry breaking in the vacuum and the effective chiral symmetry restoration
in the spectrum of highly excited mesons and baryons are described
microscopically.
| [
{
"created": "Sun, 16 Jul 2017 14:26:46 GMT",
"version": "v1"
}
] | 2017-09-05 | [
[
"Kalashnikova",
"Yu. S.",
""
],
[
"Nefediev",
"A. V.",
""
],
[
"Ribeiro",
"J. E. F. T.",
""
]
] | Various aspects of the Generalised Nambu-Jona-Lasinio model for QCD in four dimensions are reviewed. The properties of mesonic excitations are discussed in detail, with special attention paid to the chiral pion. The spontaneous chiral symmetry breaking in the vacuum and the effective chiral symmetry restoration in the spectrum of highly excited mesons and baryons are described microscopically. |
hep-ph/0210190 | Pavel Nadolsky | P.M. Nadolsky and C.-P. Yuan | Resummation for single-spin asymmetries in W boson production | 5 pages, 3 figures; Contribution to the Proceedings of 15th
International Spin Physics Symposium (SPIN 2002), Brookhaven National
Laboratory, September 9-14, 2002 | null | 10.1063/1.1607163 | null | hep-ph | null | To measure spin-dependent parton distribution functions in the production of
W bosons at the Relativistic Heavy Ion Collider, an accurate model for
distributions of charged leptons from the W boson decay is needed. We present
single-spin lepton-level cross sections of order $\alpha_S$ for this process,
as well as resummed cross sections, which include multiple parton radiation
effects. We also present a program RhicBos for the numerical analysis of
single-spin and double-spin cross sections in the Drell-Yan process, W and Z
boson production.
| [
{
"created": "Sat, 12 Oct 2002 20:15:27 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Nadolsky",
"P. M.",
""
],
[
"Yuan",
"C. -P.",
""
]
] | To measure spin-dependent parton distribution functions in the production of W bosons at the Relativistic Heavy Ion Collider, an accurate model for distributions of charged leptons from the W boson decay is needed. We present single-spin lepton-level cross sections of order $\alpha_S$ for this process, as well as resummed cross sections, which include multiple parton radiation effects. We also present a program RhicBos for the numerical analysis of single-spin and double-spin cross sections in the Drell-Yan process, W and Z boson production. |
0802.2368 | Hyun-Chul Kim | Hyun-Chul Kim, Tim Ledwig, and Klaus Goeke | Vector and axial-vector structures of the Theta^+ | 5 pages. No figure. Final version. A talk presented at International
Workshop Chiral07, Osaka, Japan, 13-16 Nov 2007 | Mod.Phys.Lett.A23:2238-2241,2008 | 10.1142/S0217732308029101 | INHA-NTG-03/2008 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present in this talk recent results of the vector and axial-vector
transitions of the nucleon to the pentaquark baryon Theta^{+}, based on the
SU(3) chiral quark-soliton model. The results are summarized as follows:
K^{*}-N-Theta vector and tensor coupling constants turn out to be g_{K^{*}N
Theta} = 0.81 and f_{K^{*}N Theta}=0.84, respectively, and the KN Theta
axial-vector coupling constant to be g_{A}^* = 0.05. As a result, the total
decay width for Theta^+ to NK becomes very small: Gamma_{Theta -> NK} = 0.71
MeV, which is consistent with the DIANA result Gamma_{Theta -> NK}=0.36 +- 0.11
MeV.
| [
{
"created": "Sun, 17 Feb 2008 09:27:19 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Mar 2008 12:38:52 GMT",
"version": "v2"
},
{
"created": "Fri, 9 May 2008 12:09:31 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Kim",
"Hyun-Chul",
""
],
[
"Ledwig",
"Tim",
""
],
[
"Goeke",
"Klaus",
""
]
] | We present in this talk recent results of the vector and axial-vector transitions of the nucleon to the pentaquark baryon Theta^{+}, based on the SU(3) chiral quark-soliton model. The results are summarized as follows: K^{*}-N-Theta vector and tensor coupling constants turn out to be g_{K^{*}N Theta} = 0.81 and f_{K^{*}N Theta}=0.84, respectively, and the KN Theta axial-vector coupling constant to be g_{A}^* = 0.05. As a result, the total decay width for Theta^+ to NK becomes very small: Gamma_{Theta -> NK} = 0.71 MeV, which is consistent with the DIANA result Gamma_{Theta -> NK}=0.36 +- 0.11 MeV. |
0712.2889 | Yu-Feng Zhou | Yue-Liang Wu, Yu-Feng Zhou and Ci Zhuang | Constraining Charming Penguins in Charmless B Decays | 22 pages, 6 figures, references added | J.Phys.G37:025006,2010 | 10.1088/0954-3899/37/2/025006 | KIAS-P07092 | hep-ph | null | We discuss the correlations of charming penguin contributions to
$B\to\pi\pi$, $\pi K$ and KK using approximate flavor SU(3) symmetry. Strong
constraints are found from the direct CP asymmetries especially in $\pi K$
modes. We make a global fit to the latest data and find that only a small
charming penguin is allowed, and the size of color-suppressed tree amplitude
(C) relative to tree amplitudes (T) remains large $C/T\simeq0.6$, which
disfavors the possibility of a large charming penguin as an explanation for the
$\pi\pi$ puzzle. We show that a small charming penguin can still have sizable
effect in the time-dependence CP asymmetries in KK mode.
| [
{
"created": "Tue, 18 Dec 2007 07:33:31 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Dec 2007 07:54:01 GMT",
"version": "v2"
}
] | 2010-01-21 | [
[
"Wu",
"Yue-Liang",
""
],
[
"Zhou",
"Yu-Feng",
""
],
[
"Zhuang",
"Ci",
""
]
] | We discuss the correlations of charming penguin contributions to $B\to\pi\pi$, $\pi K$ and KK using approximate flavor SU(3) symmetry. Strong constraints are found from the direct CP asymmetries especially in $\pi K$ modes. We make a global fit to the latest data and find that only a small charming penguin is allowed, and the size of color-suppressed tree amplitude (C) relative to tree amplitudes (T) remains large $C/T\simeq0.6$, which disfavors the possibility of a large charming penguin as an explanation for the $\pi\pi$ puzzle. We show that a small charming penguin can still have sizable effect in the time-dependence CP asymmetries in KK mode. |
0910.2587 | Fayet | Pierre Fayet | Invisible Upsilon decays into Light Dark Matter | 10 pages, 9 figures, to appear in Phys. Rev. D | Phys.Rev.D81:054025,2010 | 10.1103/PhysRevD.81.054025 | LPTENS/09-33 | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Invisible psi and Upsilon decays into light neutralinos, within the MSSM or
N(n)MSSM, are smaller than for nu nubar production, even if light spin-0
particles are coupled to quarks and neutralinos. In a more general way, light
dark matter particles are normally forbidden, unless they can annihilate
sufficiently through a new interaction stronger than weak interactions (at
lower energies), as induced by a light spin-1 U boson, or heavy-fermion
exchanges in the case of scalar dark matter. We discuss the possible
contributions of U-boson, heavy-fermion, or spin-0 exchanges to invisible psi
and Upsilon decays.
U-exchanges could lead, but not necessarily, to significant branching
fractions for invisible decays into light dark matter. We show how one can get
the correct relic density together with sufficiently small invisible branching
fractions, and the resulting constraints on the U couplings to ordinary
particles and dark matter, in particular |c_chi.f_bV| < 5 10^-3 from Upsilon
decays, for 2 m_chi smaller than a few GeV. We also explain why there is no
model-independent way to predict psi and Upsilon branching fractions into light
dark matter, from dark matter annihilation cross sections at freeze-out time.
| [
{
"created": "Wed, 14 Oct 2009 10:56:09 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Mar 2010 15:23:44 GMT",
"version": "v2"
}
] | 2015-03-13 | [
[
"Fayet",
"Pierre",
""
]
] | Invisible psi and Upsilon decays into light neutralinos, within the MSSM or N(n)MSSM, are smaller than for nu nubar production, even if light spin-0 particles are coupled to quarks and neutralinos. In a more general way, light dark matter particles are normally forbidden, unless they can annihilate sufficiently through a new interaction stronger than weak interactions (at lower energies), as induced by a light spin-1 U boson, or heavy-fermion exchanges in the case of scalar dark matter. We discuss the possible contributions of U-boson, heavy-fermion, or spin-0 exchanges to invisible psi and Upsilon decays. U-exchanges could lead, but not necessarily, to significant branching fractions for invisible decays into light dark matter. We show how one can get the correct relic density together with sufficiently small invisible branching fractions, and the resulting constraints on the U couplings to ordinary particles and dark matter, in particular |c_chi.f_bV| < 5 10^-3 from Upsilon decays, for 2 m_chi smaller than a few GeV. We also explain why there is no model-independent way to predict psi and Upsilon branching fractions into light dark matter, from dark matter annihilation cross sections at freeze-out time. |
2207.13421 | Da Huang | Da Huang, Chao-Qiang Geng, Jiajun Wu | Muon $g-2$ Anomaly from a Massive Spin-2 Particle | 32 pages, 7 figures; references added; extensive discussion on the
collider constraints from LEP-II and LHC; accepted version | null | 10.1103/PhysRevD.107.035008 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We investigate the possibility to interpret the muon $g-2$ anomaly in terms
of a massive spin-2 particle, $G$, which can be identified as the first
Kaluza-Klein graviton in the generalized Randall-Sundrum model. In particular,
we obtain the leading-order contributions to the muon $g-2$ by calculating the
relevant one-loop Feynman diagrams induced by $G$. The analytic expression is
shown to keep the gauge invariance of the quantum electrodynamics and to be
consistent with the expected UV divergence structure. Moreover, we impose the
theoretical bounds from the perturbativity and the experimental constraints
from LHC and LEP-II on our model. Especially, we derive novel perturbativity
constraints on nonrenormalizable operators related to $G$, which are the
natural generalization of the counterpart for the renormalizable operators. As
a result, we show that there exists a substantial parameter space, which can
accommodate the muon $g-2$ anomaly allowed by all constraints. Finally, we also
make comments on the possible explanation of the electron $g-2$ anomalies with
the massive spin-2 particle.
| [
{
"created": "Wed, 27 Jul 2022 09:59:45 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Sep 2022 07:02:49 GMT",
"version": "v2"
},
{
"created": "Sat, 4 Feb 2023 06:06:36 GMT",
"version": "v3"
}
] | 2023-02-22 | [
[
"Huang",
"Da",
""
],
[
"Geng",
"Chao-Qiang",
""
],
[
"Wu",
"Jiajun",
""
]
] | We investigate the possibility to interpret the muon $g-2$ anomaly in terms of a massive spin-2 particle, $G$, which can be identified as the first Kaluza-Klein graviton in the generalized Randall-Sundrum model. In particular, we obtain the leading-order contributions to the muon $g-2$ by calculating the relevant one-loop Feynman diagrams induced by $G$. The analytic expression is shown to keep the gauge invariance of the quantum electrodynamics and to be consistent with the expected UV divergence structure. Moreover, we impose the theoretical bounds from the perturbativity and the experimental constraints from LHC and LEP-II on our model. Especially, we derive novel perturbativity constraints on nonrenormalizable operators related to $G$, which are the natural generalization of the counterpart for the renormalizable operators. As a result, we show that there exists a substantial parameter space, which can accommodate the muon $g-2$ anomaly allowed by all constraints. Finally, we also make comments on the possible explanation of the electron $g-2$ anomalies with the massive spin-2 particle. |
2110.06953 | Xuan Chen | X. Chen, A. Huss, S. P. Jones, M. Kerner, J.-N. Lang, J. M. Lindert,
H. Zhang | Top-quark mass effects in H+jet and H+2 jets production | 22 pages, 7 figures | null | 10.1007/JHEP03(2022)096 | KA-TP-21-2021, TTP21-035, CERN-TH-2021-153, P3H-21-070, ZU-TH 48/21,
IPPP/21/39 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We present calculations of Higgs boson production via gluon-gluon fusion in
association with one or two additional jets at next-to-leading order in QCD.
The calculation of H+jet is exact in the treatment of the top-quark mass,
whereas for the H+2 jets calculation the two-loop virtual amplitudes are
approximated via a reweighting with leading-order mass effects, while keeping
all top-quark mass effects in the real radiation contributions. For H+jet
production, this study extends a previous calculation, revealing an error in
the previous results. For total and differential cross sections, we present new
results and compare the QCD corrections with the infinite top-mass limit, for
which we find a strikingly good agreement if all amplitudes are rescaled by the
leading-order mass dependence.
| [
{
"created": "Wed, 13 Oct 2021 18:00:10 GMT",
"version": "v1"
}
] | 2022-03-30 | [
[
"Chen",
"X.",
""
],
[
"Huss",
"A.",
""
],
[
"Jones",
"S. P.",
""
],
[
"Kerner",
"M.",
""
],
[
"Lang",
"J. -N.",
""
],
[
"Lindert",
"J. M.",
""
],
[
"Zhang",
"H.",
""
]
] | We present calculations of Higgs boson production via gluon-gluon fusion in association with one or two additional jets at next-to-leading order in QCD. The calculation of H+jet is exact in the treatment of the top-quark mass, whereas for the H+2 jets calculation the two-loop virtual amplitudes are approximated via a reweighting with leading-order mass effects, while keeping all top-quark mass effects in the real radiation contributions. For H+jet production, this study extends a previous calculation, revealing an error in the previous results. For total and differential cross sections, we present new results and compare the QCD corrections with the infinite top-mass limit, for which we find a strikingly good agreement if all amplitudes are rescaled by the leading-order mass dependence. |
hep-ph/9908244 | Boris Kopeliovich | J. Huefner, Y.B. He and B.Z. Kopeliovich | Charmonium suppression by gluon bremsstrahlung in p-A and A-B collisions | 17 pages of Latex including 10 figures | Eur.Phys.J. A7 (2000) 239-244 | 10.1007/s100500050387 | null | hep-ph nucl-th | null | Prompt gluons are an additional source for charmonium suppression in nuclear
collisions, in particular for nucleus-nucleus collisions. These gluons are
radiated as bremsstrahlung in N-N collisions and interact inelastically with
the charmonium states while the nuclei still overlap. The spectra and mean
number <n_g> of the prompt gluons are calculated perturbatively and the
gluon-Psi inelastic cross section is estimated. The integrated cross sections
for AB --> J/Psi (Psi')X for p-A and A-B collisions and the dependence on
transverse energy for S-U and Pb-Pb can be described quantitatively with some
adjustment of one parameter <n_g>\sigma(gPsi).
| [
{
"created": "Wed, 4 Aug 1999 10:23:33 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Huefner",
"J.",
""
],
[
"He",
"Y. B.",
""
],
[
"Kopeliovich",
"B. Z.",
""
]
] | Prompt gluons are an additional source for charmonium suppression in nuclear collisions, in particular for nucleus-nucleus collisions. These gluons are radiated as bremsstrahlung in N-N collisions and interact inelastically with the charmonium states while the nuclei still overlap. The spectra and mean number <n_g> of the prompt gluons are calculated perturbatively and the gluon-Psi inelastic cross section is estimated. The integrated cross sections for AB --> J/Psi (Psi')X for p-A and A-B collisions and the dependence on transverse energy for S-U and Pb-Pb can be described quantitatively with some adjustment of one parameter <n_g>\sigma(gPsi). |
2012.13989 | Ferruccio Feruglio | Ferruccio Feruglio | A Note on Gauge Anomaly Cancellation in Effective Field Theories | Corrected a numerical error in expression of the coefficients
$\xi_{\varphi A}$ and $\xi_{\varphi\varphi}$, conclusion unchanged | null | 10.1007/JHEP03(2021)128 | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | The conditions for the absence of gauge anomalies in effective field theories
(EFT) are rivisited. General results from the cohomology of the BRST operator
do not prevent potential anomalies arising from the non-renormalizable sector,
when the gauge group is not semi-simple, like in the Standard Model EFT
(SMEFT). By considering a simple explicit model that mimics the SMEFT
properties, we compute the anomaly in the regularized theory, including a
complete set of dimension six operators. We show that the dependence of the
anomaly on the non-renormalizable part can be removed by adding a local
counterterm to the theory. As a result the condition for gauge anomaly
cancellation is completely controlled by the charge assignment of the fermion
sector, as in the renormalizable theory.
| [
{
"created": "Sun, 27 Dec 2020 18:29:22 GMT",
"version": "v1"
},
{
"created": "Sun, 31 Jan 2021 09:56:51 GMT",
"version": "v2"
},
{
"created": "Sun, 25 Apr 2021 08:50:26 GMT",
"version": "v3"
}
] | 2021-04-27 | [
[
"Feruglio",
"Ferruccio",
""
]
] | The conditions for the absence of gauge anomalies in effective field theories (EFT) are rivisited. General results from the cohomology of the BRST operator do not prevent potential anomalies arising from the non-renormalizable sector, when the gauge group is not semi-simple, like in the Standard Model EFT (SMEFT). By considering a simple explicit model that mimics the SMEFT properties, we compute the anomaly in the regularized theory, including a complete set of dimension six operators. We show that the dependence of the anomaly on the non-renormalizable part can be removed by adding a local counterterm to the theory. As a result the condition for gauge anomaly cancellation is completely controlled by the charge assignment of the fermion sector, as in the renormalizable theory. |
0807.4173 | Andre Hoang | Andre H. Hoang, Vicent Mateu, S. Mohammad Zebarjad | Heavy Quark Vacuum Polarization Function at O(alpha_s^2) and
O(alpha_s^3) | 17 pages, 5 figures; new references included, more detailed
discussion | Nucl.Phys.B813:349-369,2009 | 10.1016/j.nuclphysb.2008.12.005 | MPP-2008-83 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We determine the full mass and $q^2$ dependence of the heavy quark vacuum
polarization function $\Pi(q^2)$ and its contribution to the total $e^+e^-$
cross section at ${\cal O}(\alpha_s^2)$ and ${\cal O}(\alpha_s^3)$ in
perturbative QCD. We use known results for the expansions of $\Pi(q^2)$ at high
energies, in the threshold region and around $q^2=0$, conformal mapping and the
Pad\'e approximation method. From our results for $\Pi(q^2)$ we determine
numerically at ${\cal O}(\alpha_s^3)$ the previously unknown non-logarithmic
contributions in the high-energy expansion at order $(m^2/q^2)^i$ for $i=0,1$
and the coefficients in the expansion around $q^2=0$ at order $q^{2n}$ with
$n\ge 2$. We also determine at ${\cal O}(\alpha_s^2)$ the previously unknown
${\cal O}(v^0)$ constant term in the expansion of $\Pi(q^2)$ in the threshold
region, where $v$ is the quark velocity. Our method allows for a quantitative
estimate of uncertainties and can be systematically improved once more
information in the three kinematic regions becomes available by future
multi-loop computations. For the contributions to the total $e^+e^-$ cross
section at ${\cal O}(\alpha_s^2)$ we confirm results obtained earlier by
Chetyrkin, K\"uhn and Steinhauser.
| [
{
"created": "Mon, 28 Jul 2008 19:48:50 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Sep 2008 12:58:47 GMT",
"version": "v2"
}
] | 2010-05-12 | [
[
"Hoang",
"Andre H.",
""
],
[
"Mateu",
"Vicent",
""
],
[
"Zebarjad",
"S. Mohammad",
""
]
] | We determine the full mass and $q^2$ dependence of the heavy quark vacuum polarization function $\Pi(q^2)$ and its contribution to the total $e^+e^-$ cross section at ${\cal O}(\alpha_s^2)$ and ${\cal O}(\alpha_s^3)$ in perturbative QCD. We use known results for the expansions of $\Pi(q^2)$ at high energies, in the threshold region and around $q^2=0$, conformal mapping and the Pad\'e approximation method. From our results for $\Pi(q^2)$ we determine numerically at ${\cal O}(\alpha_s^3)$ the previously unknown non-logarithmic contributions in the high-energy expansion at order $(m^2/q^2)^i$ for $i=0,1$ and the coefficients in the expansion around $q^2=0$ at order $q^{2n}$ with $n\ge 2$. We also determine at ${\cal O}(\alpha_s^2)$ the previously unknown ${\cal O}(v^0)$ constant term in the expansion of $\Pi(q^2)$ in the threshold region, where $v$ is the quark velocity. Our method allows for a quantitative estimate of uncertainties and can be systematically improved once more information in the three kinematic regions becomes available by future multi-loop computations. For the contributions to the total $e^+e^-$ cross section at ${\cal O}(\alpha_s^2)$ we confirm results obtained earlier by Chetyrkin, K\"uhn and Steinhauser. |
hep-ph/9706502 | Gerrit Schierholz | C. Best, M. G\"ockeler, R. Horsley, L. Mankiewicz, H. Perlt, P. Rakow,
A. Sch\"afer, G. Schierholz, S. Schramm, A. Schiller and P. Stephenson | Hadron Structure Functions from Lattice QCD -- 1997 | Minireview given at DIS97, Chicago, April 1997; ref. 4 corrected | null | 10.1063/1.53699 | DESY 97-116, HUB-EP-97/37 | hep-ph hep-lat | null | We review the status of lattice calculations of the deep-inelastic structure
functions of the nucleon. In addition, we present some results on the pion and
rho structure functions.
| [
{
"created": "Wed, 25 Jun 1997 12:37:19 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jul 1997 16:40:07 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Best",
"C.",
""
],
[
"Göckeler",
"M.",
""
],
[
"Horsley",
"R.",
""
],
[
"Mankiewicz",
"L.",
""
],
[
"Perlt",
"H.",
""
],
[
"Rakow",
"P.",
""
],
[
"Schäfer",
"A.",
""
],
[
"Schierholz",
"G.",
""
],
[
"Schramm",
"S.",
""
],
[
"Schiller",
"A.",
""
],
[
"Stephenson",
"P.",
""
]
] | We review the status of lattice calculations of the deep-inelastic structure functions of the nucleon. In addition, we present some results on the pion and rho structure functions. |
hep-ph/0303059 | Anatoly Kotikov | A. V. Kotikov (JINR, Dubna) | Some methods to evaluate complicated Feynman integrals | 2 pages, 1 figure, latex. Talk presented at the 8th International
Workshop on Advanced Computing and Analysis Techniques in Physics Research
(ACAT 2002), Moscow, Russia, June 2002 | Nucl.Instrum.Meth. A502 (2003) 615-617 | 10.1016/S0168-9002(03)00521-7 | null | hep-ph | null | I discuss a progress in calculations of Feynman integrals based on the
Gegenbauer Polynomial Technique and the Differential Equation Method.
| [
{
"created": "Fri, 7 Mar 2003 15:07:47 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Kotikov",
"A. V.",
"",
"JINR, Dubna"
]
] | I discuss a progress in calculations of Feynman integrals based on the Gegenbauer Polynomial Technique and the Differential Equation Method. |
0709.4413 | Bjoern Duling | Bjoern Duling | Lepton Flavor Violation in the LHT - A Clear Distinction from
Supersymmetry | Submitted for the SUSY07 proceedings, 4 pages, LaTeX, 2 eps figures,
references added | null | null | null | hep-ph | null | The Littlest Higgs Model with T-Parity (LHT) contains new sources of flavor
and CP violation both in the quark and lepton sector. These have their origin
in interactions of ordinary fermions with mirror fermions mediated by new heavy
gauge bosons. Large deviations from the Standard Model (SM) are to be expected
in the lepton sector where tiny neutrino masses suppress the SM predictions by
many orders of magnitude below the experimentally accessible level. Here we
give a brief summary of LFV processes relevant for the foreseeable future and
point out that correlations between branching ratios of LFV decays in the LHT
exhibit a structure vastly different from their analogues in the MSSM, thus
allowing for a transparent distinction between these two models.
| [
{
"created": "Thu, 27 Sep 2007 15:02:00 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Oct 2007 14:07:48 GMT",
"version": "v2"
}
] | 2007-10-11 | [
[
"Duling",
"Bjoern",
""
]
] | The Littlest Higgs Model with T-Parity (LHT) contains new sources of flavor and CP violation both in the quark and lepton sector. These have their origin in interactions of ordinary fermions with mirror fermions mediated by new heavy gauge bosons. Large deviations from the Standard Model (SM) are to be expected in the lepton sector where tiny neutrino masses suppress the SM predictions by many orders of magnitude below the experimentally accessible level. Here we give a brief summary of LFV processes relevant for the foreseeable future and point out that correlations between branching ratios of LFV decays in the LHT exhibit a structure vastly different from their analogues in the MSSM, thus allowing for a transparent distinction between these two models. |
1610.07117 | En Wang | En Wang, Ju-Jun Xie, Wei-Hong Liang, Feng-Kun Guo and Eulogio Oset | Role of a triangle singularity in the $\gamma p\rightarrow K^+
\Lambda(1405)$ reaction | 10 pages, 10 figures | Phys. Rev. C 95, 015205 (2017) | 10.1103/PhysRevC.95.015205 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show the effects of a triangle singularity mechanism for the $\gamma p \to
K^+\Lambda(1405)$ reaction. The mechanism has a $N^*$ resonance around 2030
MeV, which decays into $K^* \Sigma$. The $K^*$ decays to $K^+ \pi$, and the
$\pi \Sigma$ merge to form the $\Lambda(1405)$. This mechanism produces a peak
around $\sqrt{s} = 2110$ MeV, and has its largest contribution around
cos$\theta=0$. The addition of this mechanism to other conventional ones, leads
to a good reproduction of ${\rm d}\sigma/{\rm dcos}\theta$ and the integrated
cross section around this energy, providing a solution to a problem encountered
in previous theoretical models.
| [
{
"created": "Sun, 23 Oct 2016 03:10:05 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Nov 2016 15:16:06 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Feb 2017 08:43:38 GMT",
"version": "v3"
}
] | 2017-02-15 | [
[
"Wang",
"En",
""
],
[
"Xie",
"Ju-Jun",
""
],
[
"Liang",
"Wei-Hong",
""
],
[
"Guo",
"Feng-Kun",
""
],
[
"Oset",
"Eulogio",
""
]
] | We show the effects of a triangle singularity mechanism for the $\gamma p \to K^+\Lambda(1405)$ reaction. The mechanism has a $N^*$ resonance around 2030 MeV, which decays into $K^* \Sigma$. The $K^*$ decays to $K^+ \pi$, and the $\pi \Sigma$ merge to form the $\Lambda(1405)$. This mechanism produces a peak around $\sqrt{s} = 2110$ MeV, and has its largest contribution around cos$\theta=0$. The addition of this mechanism to other conventional ones, leads to a good reproduction of ${\rm d}\sigma/{\rm dcos}\theta$ and the integrated cross section around this energy, providing a solution to a problem encountered in previous theoretical models. |
hep-ph/9712416 | Tadek Wibig | Tadeusz Wibig (Univ. of Lodz) | Inelasticity and intranuclear cascading in geometrical multichain model | 9pp (6 eps figures) | J.Phys.G24:567-577,1998 | 10.1088/0954-3899/24/3/008 | ZPK-UL-971217 | hep-ph | null | The inelasticity in nucleus-nucleus collisions at high energies is calculated
in the framework of geometrical multichain model. The very fast increase of the
inelasticity is found as a result of a second-stage cascading process. The same
behaviour is expected for all the models using the wounded nucleon idea. The
simple formula for the number of wounded nucleons inside colliding nuclei does
not need to be exact.
| [
{
"created": "Wed, 17 Dec 1997 13:13:24 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Wibig",
"Tadeusz",
"",
"Univ. of Lodz"
]
] | The inelasticity in nucleus-nucleus collisions at high energies is calculated in the framework of geometrical multichain model. The very fast increase of the inelasticity is found as a result of a second-stage cascading process. The same behaviour is expected for all the models using the wounded nucleon idea. The simple formula for the number of wounded nucleons inside colliding nuclei does not need to be exact. |
1206.7028 | Erdogan Akyaz\'i | Erdogan Akyazi, Gokhan Unel, Metin Yilmaz | Comparison of Cut-Based and Matrix Element Method Results for Beyond
Standard Model Quarks | 16 pages, 8 figures | null | 10.5506/APhysPolB.44.1273 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, two different methods for extracting the mass of a new quark
from the (pseudo) data are compared: the classical cut-based method and the
matrix element method. As a concrete example a fourth family up type quark is
searched in p-p collisions of 7 TeV center of mass energy. We have shown that
even with very small number of events, Matrix Element Method gives better
estimations for the mass value and its error, especially for event samples in
which Signal to Background ratio is greater than 0.2.
| [
{
"created": "Fri, 29 Jun 2012 13:45:15 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Jul 2012 01:46:36 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Jul 2012 15:45:02 GMT",
"version": "v3"
},
{
"created": "Tue, 28 May 2013 23:27:10 GMT",
"version": "v4"
}
] | 2015-06-05 | [
[
"Akyazi",
"Erdogan",
""
],
[
"Unel",
"Gokhan",
""
],
[
"Yilmaz",
"Metin",
""
]
] | In this work, two different methods for extracting the mass of a new quark from the (pseudo) data are compared: the classical cut-based method and the matrix element method. As a concrete example a fourth family up type quark is searched in p-p collisions of 7 TeV center of mass energy. We have shown that even with very small number of events, Matrix Element Method gives better estimations for the mass value and its error, especially for event samples in which Signal to Background ratio is greater than 0.2. |
1606.08659 | Konstantin Chetyrkin G. | P. A. Baikov, K. G. Chetyrkin, J. H. K\"uhn | Five-Loop Running of the QCD coupling constant | 4 pages, numerical errors in eq. (13) and the next one are corrected;
a citation is added | Phys. Rev. Lett. 118, 082002 (2017) | 10.1103/PhysRevLett.118.082002 | TTP16-026 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analytically compute the five-loop term in the beta function which governs
the running of $\alpha_s$ --- the quark-gluon coupling constant in QCD. The new
term leads to a reduction of the theory uncertainty in $\alpha_s$ taken at the
Z-boson scale as extracted from the $\tau$-lepton decays as well as to new,
improved by one more order of perturbation theory, predictions for the
effective coupling constants of the Standard Model Higgs boson to gluons and
for its total decay rate to the quark-antiquark pairs.
| [
{
"created": "Tue, 28 Jun 2016 11:38:13 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Aug 2016 10:34:19 GMT",
"version": "v2"
}
] | 2017-03-01 | [
[
"Baikov",
"P. A.",
""
],
[
"Chetyrkin",
"K. G.",
""
],
[
"Kühn",
"J. H.",
""
]
] | We analytically compute the five-loop term in the beta function which governs the running of $\alpha_s$ --- the quark-gluon coupling constant in QCD. The new term leads to a reduction of the theory uncertainty in $\alpha_s$ taken at the Z-boson scale as extracted from the $\tau$-lepton decays as well as to new, improved by one more order of perturbation theory, predictions for the effective coupling constants of the Standard Model Higgs boson to gluons and for its total decay rate to the quark-antiquark pairs. |
0812.5037 | Xueqian Li | Xue-Qian Li | What do we learn from the $\rho-\pi$ puzzle | 6 pages, no figures, one reference added | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The experimental observation indicates that the branching ratio of $\psi'\to
\rho\pi$ is very small while the $\rho-\pi$ channel is a main one in $J/\psi$
decays. To understand the puzzle, various interpretations have been proposed.
Meanwhile according to the hadronic helicity selection rule the decay mode
$J/\psi\to\rho\pi$ should be suppressed, but definitely, numerical computation
is needed to determine how it is suppressed. We calculate the branching ratios
corresponding to subprocesses $J/\psi\to ggg\to\rho\pi$ and $\to ggg\to\pi\pi$
in the framework of QCD. The results show that the branching ratios are
proportional to $({m_u+m_d\over M_{J/\psi}})^2$ for $\rho\pi$ mode and
$({m_u-m_d\over M_{J/\psi}})^2$ for $\pi\pi$ mode which is an isospin-violation
channel. If only the OZI process is considered, the theoretical prediction on
the ratio of $J/\psi\to \rho\pi$ is smaller than data, but not too drastically
small. Meanwhile, a possible interpretation for the $\rho\pi$ puzzle is
proposed that the suppression is due to interference between OZI and
electromagnetic (EM) contributions. Thus based on this observation, we suggest
that if the amplitudes of the strong OZI process via an s-channel three-gluon
intermediate state and electromagnetic one via an s-channel virtual photon
intermediate state have the same order of magnitude, and constructively
interfere for $J/\psi\to\rho\pi$, but destructively interfere for
$\psi'\to\rho\pi$, thus simultaneously the $\rho\pi$ puzzle disappears and the
sizable width of $J/\psi\to\rho\i$ is understandable. However, so far, we
cannot derive the phase difference from an underlying principle of QCD yet.
Alternative interpretations are also discussed in the text.
| [
{
"created": "Tue, 30 Dec 2008 09:07:05 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Dec 2008 03:18:47 GMT",
"version": "v2"
}
] | 2008-12-31 | [
[
"Li",
"Xue-Qian",
""
]
] | The experimental observation indicates that the branching ratio of $\psi'\to \rho\pi$ is very small while the $\rho-\pi$ channel is a main one in $J/\psi$ decays. To understand the puzzle, various interpretations have been proposed. Meanwhile according to the hadronic helicity selection rule the decay mode $J/\psi\to\rho\pi$ should be suppressed, but definitely, numerical computation is needed to determine how it is suppressed. We calculate the branching ratios corresponding to subprocesses $J/\psi\to ggg\to\rho\pi$ and $\to ggg\to\pi\pi$ in the framework of QCD. The results show that the branching ratios are proportional to $({m_u+m_d\over M_{J/\psi}})^2$ for $\rho\pi$ mode and $({m_u-m_d\over M_{J/\psi}})^2$ for $\pi\pi$ mode which is an isospin-violation channel. If only the OZI process is considered, the theoretical prediction on the ratio of $J/\psi\to \rho\pi$ is smaller than data, but not too drastically small. Meanwhile, a possible interpretation for the $\rho\pi$ puzzle is proposed that the suppression is due to interference between OZI and electromagnetic (EM) contributions. Thus based on this observation, we suggest that if the amplitudes of the strong OZI process via an s-channel three-gluon intermediate state and electromagnetic one via an s-channel virtual photon intermediate state have the same order of magnitude, and constructively interfere for $J/\psi\to\rho\pi$, but destructively interfere for $\psi'\to\rho\pi$, thus simultaneously the $\rho\pi$ puzzle disappears and the sizable width of $J/\psi\to\rho\i$ is understandable. However, so far, we cannot derive the phase difference from an underlying principle of QCD yet. Alternative interpretations are also discussed in the text. |
1108.3514 | Guido Altarelli | G. Altarelli | Concluding Talk: A Theorist Overview on Particle Physics | 15 pages. Talk presented at the Ninth International Conference on
Flavor Physics and CP Violation (FPCP 2011), Maale Hachamisha, Israel, May
23-27, 2011 | null | null | RM3-TH/11-11; CERN-PH-TH/2011-197 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is a Concluding Talk, not a Summary of the FPCP 2011 Conference. I will
first make some comments on the status and the prospects of particle physics
and then review some of the highlights that particularly impressed me at this
Conference (a subjective choice).
| [
{
"created": "Wed, 17 Aug 2011 15:59:10 GMT",
"version": "v1"
}
] | 2011-08-18 | [
[
"Altarelli",
"G.",
""
]
] | This is a Concluding Talk, not a Summary of the FPCP 2011 Conference. I will first make some comments on the status and the prospects of particle physics and then review some of the highlights that particularly impressed me at this Conference (a subjective choice). |
1512.05221 | Elisabetta Perotti | E. Perotti (Uppsala U.), C. Niblaeus (Stockholm U.), S. Leupold
(Uppsala U.) | Lifetime of the eta' meson at low temperature | 49 pages | null | 10.1016/j.nuclphysa.2016.02.054 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work constitutes one part of an investigation of the low-temperature
changes of the properties of the eta' meson. In turn these properties are
strongly tied to the U(1)_A anomaly of Quantum Chromodynamics. The final aim is
to explore the interplay of the chiral anomaly and in-medium effects. We
determine the lifetime of an eta' meson being at rest in a strongly interacting
medium as a function of the temperature. To have a formally well-defined
low-energy limit we use in a first step Chiral Perturbation Theory for a large
number of colors. We determine the pertinent scattering amplitudes in leading
and next-to-leading order. In a second step we include resonances that appear
in the same mass range as the eta' meson. The resonances are introduced such
that the low-energy limit remains unchanged and that they saturate the
corresponding low-energy constants. This requirement fixes all coupling
constants. We find that the width of the eta' meson is significantly increased
from about 200 keV in vacuum to about 10 MeV at a temperature of 120 MeV.
| [
{
"created": "Wed, 16 Dec 2015 15:59:08 GMT",
"version": "v1"
}
] | 2016-04-20 | [
[
"Perotti",
"E.",
"",
"Uppsala U."
],
[
"Niblaeus",
"C.",
"",
"Stockholm U."
],
[
"Leupold",
"S.",
"",
"Uppsala U."
]
] | This work constitutes one part of an investigation of the low-temperature changes of the properties of the eta' meson. In turn these properties are strongly tied to the U(1)_A anomaly of Quantum Chromodynamics. The final aim is to explore the interplay of the chiral anomaly and in-medium effects. We determine the lifetime of an eta' meson being at rest in a strongly interacting medium as a function of the temperature. To have a formally well-defined low-energy limit we use in a first step Chiral Perturbation Theory for a large number of colors. We determine the pertinent scattering amplitudes in leading and next-to-leading order. In a second step we include resonances that appear in the same mass range as the eta' meson. The resonances are introduced such that the low-energy limit remains unchanged and that they saturate the corresponding low-energy constants. This requirement fixes all coupling constants. We find that the width of the eta' meson is significantly increased from about 200 keV in vacuum to about 10 MeV at a temperature of 120 MeV. |
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