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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1211.7209 | Jure Drobnak | Jure Drobnak | Top Decays in the Standard Model and Beyond | Proceedings of CKM 2012, the 7th International Workshop on the CKM
Unitarity Triangle, University of Cincinnati, USA, 28 September - 2 October
2012 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In these proceedings we explore the possibility of new physics manifesting
itself in rare top quark decays. In particular, we adopt an effective theory
description of FCNC t -> q V top quark decays and possible deviations from the
SM form of tWb vertices which would affect the helicity fractions of the W
boson produced in the main decay channel of top quark.
| [
{
"created": "Fri, 30 Nov 2012 10:50:52 GMT",
"version": "v1"
}
] | 2012-12-03 | [
[
"Drobnak",
"Jure",
""
]
] | In these proceedings we explore the possibility of new physics manifesting itself in rare top quark decays. In particular, we adopt an effective theory description of FCNC t -> q V top quark decays and possible deviations from the SM form of tWb vertices which would affect the helicity fractions of the W boson produced in the main decay channel of top quark. |
2012.01363 | Malgorzata Worek | Giuseppe Bevilacqua, Huan-Yu Bi, Heribertus Bayu Hartanto, Manfred
Kraus, Jasmina Nasufi and Malgorzata Worek | NLO QCD corrections to off-shell ${t\bar{t}W^\pm}$ production at the
LHC: Correlations and Asymmetries | 24 pages, 11 figures, 7 tables. Asymmetry plots and citations added,
discussion of effects beyond NLO in QCD added. The discussion on PDF
uncertainties has been extended. The version to appear in the European
Physical Journal C | Eur. Phys. J. C 81 (2021) 675 | 10.1140/epjc/s10052-021-09478-x | TTK-20-43, P3H-20-078, CAVENDISH-HEP-20/14 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Recent discrepancies between theoretical predictions and experimental data in
multi-lepton plus $b$-jets analyses for the $t\bar{t}W^\pm$ process, as
reported by the ATLAS collaboration, have indicated that more accurate
theoretical predictions and high precision observables are needed to constrain
numerous new physics scenarios in this channel. To this end we employ NLO QCD
computations with full off-shell top quark effects included to provide
theoretical predictions for the ${\cal R}=
\sigma_{t\bar{t}W^+}/\sigma_{t\bar{t}W^-}$ cross section ratio at the LHC with
$\sqrt{s}=13$ TeV. Depending on the transverse momentum cut on the $b$-jet we
obtain $2\% -3 \%$ theoretical precision on ${\cal R}$, which should help to
shed some light on new physics effects that can reveal themselves only once
sufficiently precise Standard Model theoretical predictions are available.
Furthermore, triggered by these discrepancies we reexamine the charge asymmetry
of the top quark and its decay products in the $t\bar{t}W^\pm$ production
process. In the case of charge asymmetries, that are uniquely sensitive to the
chiral nature of possible new physics in this channel, theoretical
uncertainties below $15\%$ are obtained. Additionally, the impact of the top
quark decay modelling is scrutinised by explicit comparison with predictions in
the narrow-width approximation.
| [
{
"created": "Wed, 2 Dec 2020 18:03:41 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Apr 2021 16:35:46 GMT",
"version": "v2"
},
{
"created": "Sat, 24 Jul 2021 12:40:31 GMT",
"version": "v3"
}
] | 2021-08-04 | [
[
"Bevilacqua",
"Giuseppe",
""
],
[
"Bi",
"Huan-Yu",
""
],
[
"Hartanto",
"Heribertus Bayu",
""
],
[
"Kraus",
"Manfred",
""
],
[
"Nasufi",
"Jasmina",
""
],
[
"Worek",
"Malgorzata",
""
]
] | Recent discrepancies between theoretical predictions and experimental data in multi-lepton plus $b$-jets analyses for the $t\bar{t}W^\pm$ process, as reported by the ATLAS collaboration, have indicated that more accurate theoretical predictions and high precision observables are needed to constrain numerous new physics scenarios in this channel. To this end we employ NLO QCD computations with full off-shell top quark effects included to provide theoretical predictions for the ${\cal R}= \sigma_{t\bar{t}W^+}/\sigma_{t\bar{t}W^-}$ cross section ratio at the LHC with $\sqrt{s}=13$ TeV. Depending on the transverse momentum cut on the $b$-jet we obtain $2\% -3 \%$ theoretical precision on ${\cal R}$, which should help to shed some light on new physics effects that can reveal themselves only once sufficiently precise Standard Model theoretical predictions are available. Furthermore, triggered by these discrepancies we reexamine the charge asymmetry of the top quark and its decay products in the $t\bar{t}W^\pm$ production process. In the case of charge asymmetries, that are uniquely sensitive to the chiral nature of possible new physics in this channel, theoretical uncertainties below $15\%$ are obtained. Additionally, the impact of the top quark decay modelling is scrutinised by explicit comparison with predictions in the narrow-width approximation. |
1503.06938 | Sumeet Dagaonkar | Sumeet Dagaonkar, Pankaj Jain, John P. Ralston | The Dirac Form Factor Predicts the Pauli Form Factor in the Endpoint
Model | 12 pages, 3 figures | null | 10.1140/epjc/s10052-016-4224-4 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the momentum-transfer dependence of the proton Pauli form factor
$F_{2}$ in the endpoint overlap model. We find the model correctly reproduces
the scaling of the ratio of $F_{2}$ with the Dirac Form factor $F_{1}$ observed
at the Jefferson Laboratory. The calculation uses the leading-power, leading
twist Dirac structure of the quark light-cone wave function, and the same
endpoint dependence previously determined from the Dirac form factor $F_{1}$.
There are no parameters and no adjustable functions in the endpoint model's
prediction for $F_{2}$. The model's predicted ratio $F_{2}(Q^{2})/F_{1}(Q^{2})$
is quite insensitive to the endpoint wave function, which explains why the
observed ratio scales like $1/Q$ down to rather low momentum transfers. The
endpoint model appears to be the only comprehensive model consistent with all
form factor information as well as reproducing fixed-angle proton-proton
scattering at large momentum transfer. Any one of the processes is capable of
predicting the others.
| [
{
"created": "Tue, 24 Mar 2015 07:39:08 GMT",
"version": "v1"
}
] | 2016-07-20 | [
[
"Dagaonkar",
"Sumeet",
""
],
[
"Jain",
"Pankaj",
""
],
[
"Ralston",
"John P.",
""
]
] | We compute the momentum-transfer dependence of the proton Pauli form factor $F_{2}$ in the endpoint overlap model. We find the model correctly reproduces the scaling of the ratio of $F_{2}$ with the Dirac Form factor $F_{1}$ observed at the Jefferson Laboratory. The calculation uses the leading-power, leading twist Dirac structure of the quark light-cone wave function, and the same endpoint dependence previously determined from the Dirac form factor $F_{1}$. There are no parameters and no adjustable functions in the endpoint model's prediction for $F_{2}$. The model's predicted ratio $F_{2}(Q^{2})/F_{1}(Q^{2})$ is quite insensitive to the endpoint wave function, which explains why the observed ratio scales like $1/Q$ down to rather low momentum transfers. The endpoint model appears to be the only comprehensive model consistent with all form factor information as well as reproducing fixed-angle proton-proton scattering at large momentum transfer. Any one of the processes is capable of predicting the others. |
hep-ph/9710543 | Edmond Iancu | Edmond Iancu (Service de Physique Theorique, Saclay, France) | Effective theory for real-time dynamics in hot gauge theories | 11 pages, LaTeX, major rewriting, new title, new references | null | 10.1016/S0370-2693(98)00772-2 | Saclay-T97/123 | hep-ph | null | For a high temperature non-Abelian plasma, we reformulate the hard thermal
loop approximation as an effective classical thermal field theory for the soft
modes. The effective theory is written in local Hamiltonian form, and the
thermal partition function is explicitly constructed. It involves an
ultraviolet cutoff which separates between hard and soft degrees of freedom in
a gauge-invariant way, together with counterterms which cancel the cutoff
dependence in the soft correlation functions. The effective theory is well
suited for numerical studies of the non-perturbative dynamics in real time, in
particular, for the computation of the baryon number violation rate at high
temperature.
| [
{
"created": "Thu, 30 Oct 1997 17:32:44 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Mar 1998 13:04:42 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Iancu",
"Edmond",
"",
"Service de Physique Theorique, Saclay, France"
]
] | For a high temperature non-Abelian plasma, we reformulate the hard thermal loop approximation as an effective classical thermal field theory for the soft modes. The effective theory is written in local Hamiltonian form, and the thermal partition function is explicitly constructed. It involves an ultraviolet cutoff which separates between hard and soft degrees of freedom in a gauge-invariant way, together with counterterms which cancel the cutoff dependence in the soft correlation functions. The effective theory is well suited for numerical studies of the non-perturbative dynamics in real time, in particular, for the computation of the baryon number violation rate at high temperature. |
1905.07963 | Conny Beskidt | C. Beskidt (1), W. de Boer (1), ((1) Karlsruhe Institute of
Technology, Germany) | An effective scanning method of the NMSSM parameter space | 15 pages, 5 figures | Phys. Rev. D 100, 055007 (2019) | 10.1103/PhysRevD.100.055007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The next-to-minimal supersymmetric standard model (NMSSM) naturally provides
a 125 GeV Higgs boson without the need for large loop corrections from
multi-TeV stop quarks. Furthermore, the NMSSM provides an electroweak scale
dark matter candidate consistent with all experimental data, like relic density
and non-observation of direct dark matter signals with the present experimental
sensitivity. However, more free parameters are introduced in the NMSSM, which
are strongly correlated. A simple parameter scan without knowing the
correlation matrix is not efficient and can miss significant regions of the
parameter space. We introduce a new technique to sample the NMSSM parameter
space, which takes into account the correlations. For this we project the 7D
NMSSM parameter space onto the 3D Higgs boson mass parameter space. The reduced
dimensionality allows for a non-random sampling and therefore a complete
coverage of the allowed NMSSM parameters. In addition, the parameter
correlations and possible deviations of the signal strengths of the observed
125 Higgs boson from the SM values are easily predicted.
| [
{
"created": "Mon, 20 May 2019 09:49:04 GMT",
"version": "v1"
}
] | 2019-09-18 | [
[
"Beskidt",
"C.",
""
],
[
"de Boer",
"W.",
""
]
] | The next-to-minimal supersymmetric standard model (NMSSM) naturally provides a 125 GeV Higgs boson without the need for large loop corrections from multi-TeV stop quarks. Furthermore, the NMSSM provides an electroweak scale dark matter candidate consistent with all experimental data, like relic density and non-observation of direct dark matter signals with the present experimental sensitivity. However, more free parameters are introduced in the NMSSM, which are strongly correlated. A simple parameter scan without knowing the correlation matrix is not efficient and can miss significant regions of the parameter space. We introduce a new technique to sample the NMSSM parameter space, which takes into account the correlations. For this we project the 7D NMSSM parameter space onto the 3D Higgs boson mass parameter space. The reduced dimensionality allows for a non-random sampling and therefore a complete coverage of the allowed NMSSM parameters. In addition, the parameter correlations and possible deviations of the signal strengths of the observed 125 Higgs boson from the SM values are easily predicted. |
hep-ph/0303198 | Ulf-G. Mei{\ss}ner | V\'eronique Bernard, Thomas R. Hemmert, Ulf-G. Mei{\ss}ner | Infrared regularization with spin-3/2 fields | 9 pp, 1 fig | Phys.Lett. B565 (2003) 137-145 | 10.1016/S0370-2693(03)00538-0 | null | hep-ph hep-th nucl-th | null | We present a Lorentz-invariant formulation of baryon chiral perturbation
theory including spin-3/2 fields. Particular attention is paid to the
projection on the spin-3/2 components of the delta fields. We also discuss the
nucleon mass and the pion-nucleon sigma term.
| [
{
"created": "Mon, 24 Mar 2003 13:03:12 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Bernard",
"Véronique",
""
],
[
"Hemmert",
"Thomas R.",
""
],
[
"Meißner",
"Ulf-G.",
""
]
] | We present a Lorentz-invariant formulation of baryon chiral perturbation theory including spin-3/2 fields. Particular attention is paid to the projection on the spin-3/2 components of the delta fields. We also discuss the nucleon mass and the pion-nucleon sigma term. |
1211.6294 | C\'edric Lorc\'e | Cedric Lorce (IPNO and LPT, Orsay) and Barbara Pasquini (Pavia U. and
INFN, Pavia) | Accessing the quark orbital angular momentum with Wigner distributions | 4 pages, 1 figure, contribution to the proceedings of the DIFFRACTION
2012 Workshop, Sep 10-15, Puerto del Carmen, Spain | null | 10.1063/1.4802141 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quark orbital angular momentum (OAM) has been recognized as an important
piece of the proton spin puzzle. A lot of effort has been invested in trying to
extract it quantitatively from the generalized parton distributions (GPDs) and
the transverse-momentum dependent parton distributions (TMDs), which are
accessed in high-energy processes and provide three-dimensional pictures of the
nucleon. Recently, we have shown that it is more natural to access the quark
OAM from the phase-space or Wigner distributions. We discuss the concept of
Wigner distributions in the context of quantum field theory and show how they
are related to the GPDs and the TMDs. We summarize the different definitions
discussed in the literature for the quark OAM and show how they can in
principle be extracted from the Wigner distributions.
| [
{
"created": "Tue, 27 Nov 2012 13:13:03 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Nov 2012 09:07:48 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Lorce",
"Cedric",
"",
"IPNO and LPT, Orsay"
],
[
"Pasquini",
"Barbara",
"",
"Pavia U. and\n INFN, Pavia"
]
] | The quark orbital angular momentum (OAM) has been recognized as an important piece of the proton spin puzzle. A lot of effort has been invested in trying to extract it quantitatively from the generalized parton distributions (GPDs) and the transverse-momentum dependent parton distributions (TMDs), which are accessed in high-energy processes and provide three-dimensional pictures of the nucleon. Recently, we have shown that it is more natural to access the quark OAM from the phase-space or Wigner distributions. We discuss the concept of Wigner distributions in the context of quantum field theory and show how they are related to the GPDs and the TMDs. We summarize the different definitions discussed in the literature for the quark OAM and show how they can in principle be extracted from the Wigner distributions. |
hep-ph/9410265 | null | Yung Su Tsai | Production of Polarized tau Pairs and Tests of CP Violation Using
Polarized e+e- Colliders Near Threshold | 30 pages, 5 figures, uuencoded file, SLAC-PUB-6685 | Phys.Rev.D51:3172-3181,1995 | 10.1103/PhysRevD.51.3172 | null | hep-ph | null | We consider the production of tau pairs by electron-positron colliding beams
at the maximum cross section near the threshold. At this energy tau pairs are
produced mostly in the s-wave which implies that the spin of the tau pairs are
almost always pointing in the beam direction independent of the production
angle. When both electrons and positrons are longitudinally polarized in the
same direction, for example 90%, one can obtain tau pairs with 99% polarization
in the direction of the polarization vectors of the incident beams. Tests of CP
violation and study of the structure of weak interactions using such polarized
tau pairs are discussed.
| [
{
"created": "Tue, 11 Oct 1994 20:08:44 GMT",
"version": "v1"
}
] | 2009-12-30 | [
[
"Tsai",
"Yung Su",
""
]
] | We consider the production of tau pairs by electron-positron colliding beams at the maximum cross section near the threshold. At this energy tau pairs are produced mostly in the s-wave which implies that the spin of the tau pairs are almost always pointing in the beam direction independent of the production angle. When both electrons and positrons are longitudinally polarized in the same direction, for example 90%, one can obtain tau pairs with 99% polarization in the direction of the polarization vectors of the incident beams. Tests of CP violation and study of the structure of weak interactions using such polarized tau pairs are discussed. |
hep-ph/0110244 | Esteban Calzetta | Mariana Gra\~na and Esteban Calzetta | Reheating and turbulence | 10 pages, one figure included in text | Phys.Rev. D65 (2002) 063522 | 10.1103/PhysRevD.65.063522 | null | hep-ph astro-ph | null | We show that the ''turbulent'' particle spectra found in numerical
simulations of the behavior of matter fields during reheating admit a simple
interpretation in terms of hydrodynamic models of the reheating period. We
predict a particle number spectrum $n_{k}\propto k^{-\alpha}$ with $\alpha \sim
2$ for $k\to 0.$
| [
{
"created": "Wed, 17 Oct 2001 21:12:12 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Jan 2002 17:18:09 GMT",
"version": "v2"
}
] | 2016-08-16 | [
[
"Graña",
"Mariana",
""
],
[
"Calzetta",
"Esteban",
""
]
] | We show that the ''turbulent'' particle spectra found in numerical simulations of the behavior of matter fields during reheating admit a simple interpretation in terms of hydrodynamic models of the reheating period. We predict a particle number spectrum $n_{k}\propto k^{-\alpha}$ with $\alpha \sim 2$ for $k\to 0.$ |
2203.08347 | Christopher Potter | Laura Jeanty, Laura Nosler, Chris Potter | Sensitivity to decays of long-lived dark photons at the ILC (A Snowmass
White Paper) | Expanded discussion of backgrounds, additional figures and tables | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the sensitivity to long-lived dark photons produced in
Higgstrahlung events via the Higgs portal, $H \rightarrow \gamma_{D}
\gamma_{D}$, with the Silicon Detector (SiD) at the International Linear
Collider (ILC). These events provide a useful benchmark for tracking and vertex
detector performance with long-lived particle decays at displaced vertices. The
ILC is one of several Higgs factories proposed by the international community
to study the properties of the Higgs boson at high precision.
| [
{
"created": "Wed, 16 Mar 2022 01:55:15 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Jun 2022 13:53:57 GMT",
"version": "v2"
}
] | 2022-06-28 | [
[
"Jeanty",
"Laura",
""
],
[
"Nosler",
"Laura",
""
],
[
"Potter",
"Chris",
""
]
] | We investigate the sensitivity to long-lived dark photons produced in Higgstrahlung events via the Higgs portal, $H \rightarrow \gamma_{D} \gamma_{D}$, with the Silicon Detector (SiD) at the International Linear Collider (ILC). These events provide a useful benchmark for tracking and vertex detector performance with long-lived particle decays at displaced vertices. The ILC is one of several Higgs factories proposed by the international community to study the properties of the Higgs boson at high precision. |
1305.4329 | Hong Mao | Hong Mao | On the symmetry improved CJT formalism in the $O(4)$ linear sigma model | 11 pages, 3 figures, corrected typos and added references, Accepted
for publication in Nuclear Physics A | Nuclear Physics A 925 (2014) 185-198 | 10.1016/j.nuclphysa.2014.02.011 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By using the symmetry improved CJT effective formalism developed by Pilaftsis
and Teresi, the chiral phase transition is reconsidered in the framework of the
$O(4)$ linear sigma model in chiral limit. Our results confirm the restorations
of the second-order phase transition and the Goldstone theorem in the Hartree
approximation. Finally, we explicitly calculate the effective potentials via
the order parameter for various temperatures and address advantages of the
present method in comparison with the $O(N)$ model in large-$N$ approximation.
| [
{
"created": "Sun, 19 May 2013 06:35:06 GMT",
"version": "v1"
},
{
"created": "Thu, 23 May 2013 05:56:31 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Jun 2013 03:55:44 GMT",
"version": "v3"
},
{
"created": "Mon, 17 Feb 2014 23:17:01 GMT",
"version": "v4"
},
{
"c... | 2014-03-11 | [
[
"Mao",
"Hong",
""
]
] | By using the symmetry improved CJT effective formalism developed by Pilaftsis and Teresi, the chiral phase transition is reconsidered in the framework of the $O(4)$ linear sigma model in chiral limit. Our results confirm the restorations of the second-order phase transition and the Goldstone theorem in the Hartree approximation. Finally, we explicitly calculate the effective potentials via the order parameter for various temperatures and address advantages of the present method in comparison with the $O(N)$ model in large-$N$ approximation. |
1105.4498 | Matthew Wingate | Matthew Wingate | Lattice QCD Calculations with b Quarks: Status and Prospects | 8 pages. Invited talk at the 13th International Conference on
B-Physics at Hadron Machines (BEAUTY 2011), 4-8 April 2011, Amsterdam, The
Netherlands, to appear as PoS(BEAUTY 2011)057. Version 2: updated discussion
of UTfit Collaboration's LQCD inputs | null | null | DAMTP-2011-31 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This talk gives an overview of how lattice QCD calculations are influencing
quark flavor physics. The first part of the talk focuses on the climb to higher
precision; the second part surveys views along less-trodden paths.
| [
{
"created": "Mon, 23 May 2011 13:34:18 GMT",
"version": "v1"
},
{
"created": "Mon, 30 May 2011 15:08:16 GMT",
"version": "v2"
}
] | 2011-05-31 | [
[
"Wingate",
"Matthew",
""
]
] | This talk gives an overview of how lattice QCD calculations are influencing quark flavor physics. The first part of the talk focuses on the climb to higher precision; the second part surveys views along less-trodden paths. |
hep-ph/0601217 | Wolfgang Kilian | W. Kilian and P.M. Zerwas | ILC: Physics Scenarios | 28pp, Talk 2005 Snowmass Workshop | ECONFC0508141:PLEN0003,2005 | null | DESY 06-012 | hep-ph | null | Experiments in the energy range from the scale of electroweak symmetry
breaking to the TeV scale are expected to be crucial for unraveling the
microscopic structure of matter and forces. The high precision which should be
achieved in experiments at lepton colliders, is a necessary ingredient for
providing a comprehensive picture of the mechanism breaking the electroweak
symmetries and generating mass, the unification of forces, involving most
likely supersymmetry, and the structure of space-time at small distances. In
addition, clarifying the nature of the particles which build up cold dark
matter in the universe, needs a lepton collider to match the high experimental
precision which will be reached in cosmology experiments.
| [
{
"created": "Thu, 26 Jan 2006 16:16:37 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kilian",
"W.",
""
],
[
"Zerwas",
"P. M.",
""
]
] | Experiments in the energy range from the scale of electroweak symmetry breaking to the TeV scale are expected to be crucial for unraveling the microscopic structure of matter and forces. The high precision which should be achieved in experiments at lepton colliders, is a necessary ingredient for providing a comprehensive picture of the mechanism breaking the electroweak symmetries and generating mass, the unification of forces, involving most likely supersymmetry, and the structure of space-time at small distances. In addition, clarifying the nature of the particles which build up cold dark matter in the universe, needs a lepton collider to match the high experimental precision which will be reached in cosmology experiments. |
hep-ph/9708412 | Randy Kobes | M. Carrington, R. Kobes, and E. Petitgirard | Cancellation of ladder graphs in an effective expansion | 14 pages, 8 figures, LaTeX, uses epsf and revtex, also available at
http://theory.uwinnipeg.ca/users/randy/webfiles/ladder.uu | Phys.Rev. D57 (1998) 2631-2634 | 10.1103/PhysRevD.57.2631 | WIN-97-12 | hep-ph | null | A resummation of ladder graphs is important in cases where infrared,
collinear, or light-cone singularities render the loop expansion invalid,
especially at high temperature where these effects are often enhanced. It has
been noted in some recent examples of this resummation that the ladder graphs
are canceled by other types of terms. In this note we show that this
cancellation is quite general, and for the most part algebraic.
| [
{
"created": "Wed, 20 Aug 1997 03:32:04 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Carrington",
"M.",
""
],
[
"Kobes",
"R.",
""
],
[
"Petitgirard",
"E.",
""
]
] | A resummation of ladder graphs is important in cases where infrared, collinear, or light-cone singularities render the loop expansion invalid, especially at high temperature where these effects are often enhanced. It has been noted in some recent examples of this resummation that the ladder graphs are canceled by other types of terms. In this note we show that this cancellation is quite general, and for the most part algebraic. |
1411.4085 | Stefan H\"oche | Stefan H\"oche | Introduction to parton-shower event generators | 40 pages, 12 figures. Lectures presented at TASI 2014 | null | null | SLAC-PUB 16160 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This lecture discusses the physics implemented by Monte Carlo event
generators for hadron colliders. It details the construction of parton showers
and the matching of parton showers to fixed-order calculations at higher orders
in perturbative QCD. It also discusses approaches to merge calculations for a
varying number of jets, the interface to the underlying event and
hadronization.
| [
{
"created": "Fri, 14 Nov 2014 23:58:47 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jun 2015 19:13:29 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Höche",
"Stefan",
""
]
] | This lecture discusses the physics implemented by Monte Carlo event generators for hadron colliders. It details the construction of parton showers and the matching of parton showers to fixed-order calculations at higher orders in perturbative QCD. It also discusses approaches to merge calculations for a varying number of jets, the interface to the underlying event and hadronization. |
hep-ph/9807374 | Pierre Sikivie | S. Chang (U. of Florida), C. Hagmann (LLNL) and P. Sikivie (U. of
Florida) | Studies of the motion and decay of axion walls bounded by strings | 37 pages, 10 figures, a minor mistake was corrected, several
references and comments were added | Phys.Rev. D59 (1999) 023505 | 10.1103/PhysRevD.59.023505 | UFIFT-HEP-98-12 | hep-ph astro-ph | null | We discuss the appearance at the QCD phase transition, and the subsequent
decay, of axion walls bounded by strings in N=1 axion models. We argue on
intuitive grounds that the main decay mechanism is into barely relativistic
axions. We present numerical simulations of the decay process. In these
simulations, the decay happens immediately, in a time scale of order the light
travel time, and the average energy of the radiated axions is $<\omega_a >
\simeq 7 m_a$ for $v_a/m_a \simeq 500$. $<\omega_a>$ is found to increase
approximately linearly with $\ln(v_a/m_a)$. Extrapolation of this behaviour
yields $<\omega_a> \sim 60 m_a$ in axion models of interest. We find that the
contribution to the cosmological energy density of axions from wall decay is of
the same order of magnitude as that from vacuum realignment, with however large
uncertainties. The velocity dispersion of axions from wall decay is found to be
larger, by a factor $10^3$ or so, than that of axions from vacuum realignment
and string decay. We discuss the implications of this for the formation and
evolution of axion miniclusters and for the direct detection of axion dark
matter on Earth. Finally we discuss the cosmology of axion models with $N>1$ in
which the domain wall problem is solved by introducing a small U$_{PQ}$(1)
breaking interaction. We find that in this case the walls decay into
gravitational waves.
| [
{
"created": "Tue, 14 Jul 1998 20:17:04 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Sep 1998 15:13:29 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Chang",
"S.",
"",
"U. of Florida"
],
[
"Hagmann",
"C.",
"",
"LLNL"
],
[
"Sikivie",
"P.",
"",
"U. of\n Florida"
]
] | We discuss the appearance at the QCD phase transition, and the subsequent decay, of axion walls bounded by strings in N=1 axion models. We argue on intuitive grounds that the main decay mechanism is into barely relativistic axions. We present numerical simulations of the decay process. In these simulations, the decay happens immediately, in a time scale of order the light travel time, and the average energy of the radiated axions is $<\omega_a > \simeq 7 m_a$ for $v_a/m_a \simeq 500$. $<\omega_a>$ is found to increase approximately linearly with $\ln(v_a/m_a)$. Extrapolation of this behaviour yields $<\omega_a> \sim 60 m_a$ in axion models of interest. We find that the contribution to the cosmological energy density of axions from wall decay is of the same order of magnitude as that from vacuum realignment, with however large uncertainties. The velocity dispersion of axions from wall decay is found to be larger, by a factor $10^3$ or so, than that of axions from vacuum realignment and string decay. We discuss the implications of this for the formation and evolution of axion miniclusters and for the direct detection of axion dark matter on Earth. Finally we discuss the cosmology of axion models with $N>1$ in which the domain wall problem is solved by introducing a small U$_{PQ}$(1) breaking interaction. We find that in this case the walls decay into gravitational waves. |
1705.03897 | Yanou Cui | Yanou Cui and Francesco D'Eramo | Surprises from Complete Vector Portal Theories: New Insights into the
Dark Sector and its Interplay with Higgs Physics | 5 pages, 3 figures; v2: minor corrections, references added, journal
version | Phys. Rev. D 96, 095006 (2017) | 10.1103/PhysRevD.96.095006 | SCIPP 17/05 | hep-ph astro-ph.CO hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study UV complete theories where the Standard Model (SM) gauge group is
extended with a new abelian $U(1)$, and the field content is augmented by an
arbitrary number of scalar and fermion SM singlets, potentially including dark
matter (DM) candidates. Considerations such as classical and quantum gauge
invariance of the full theory and S-matrix unitarity, not applicable within a
simplified model approach, are shown to have significant phenomenological
consequences. The lack of gauge anomalies leads to compact relations among the
$U(1)$ fermion charges, and puts a lower bound on the number of dark fermions.
Contrary to naive expectations, the DM annihilation to Zh is found to be p-wave
suppressed, as hinted by perturbative unitarity of S-matrix, with dramatic
implications for DM thermal relic density and indirect searches. Within this
framework, the interplay between dark matter, new vector boson and Higgs
physics is rather natural and generic.
| [
{
"created": "Wed, 10 May 2017 18:00:14 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Nov 2017 23:58:53 GMT",
"version": "v2"
}
] | 2017-11-29 | [
[
"Cui",
"Yanou",
""
],
[
"D'Eramo",
"Francesco",
""
]
] | We study UV complete theories where the Standard Model (SM) gauge group is extended with a new abelian $U(1)$, and the field content is augmented by an arbitrary number of scalar and fermion SM singlets, potentially including dark matter (DM) candidates. Considerations such as classical and quantum gauge invariance of the full theory and S-matrix unitarity, not applicable within a simplified model approach, are shown to have significant phenomenological consequences. The lack of gauge anomalies leads to compact relations among the $U(1)$ fermion charges, and puts a lower bound on the number of dark fermions. Contrary to naive expectations, the DM annihilation to Zh is found to be p-wave suppressed, as hinted by perturbative unitarity of S-matrix, with dramatic implications for DM thermal relic density and indirect searches. Within this framework, the interplay between dark matter, new vector boson and Higgs physics is rather natural and generic. |
hep-ph/9610517 | Ben Allanach | B.C. Allanach (Rutherford), S.F. King (Southampton U.), G.K. Leontaris
(Ioannina U.), S.Lola (CERN) | Yukawa Textures in String Unified Models With SU(4)xO(4) Symmetry | Revised version to include string section on origin of
non-renormalisable operators. 54 pages LaTeX | Phys.Rev.D56:2632-2655,1997 | 10.1103/PhysRevD.56.2632 | CERN-TH-96-300. IOA-05-96. RAL-TR-96-091. SHEP-96-29 | hep-ph | null | We discuss the origin of Yukawa textures in the string-inspired and string
derived models based on the gauge group SU(4)xSU(2)_LxSU(2)_R supplemented by a
U(1)_X gauged family symmetry. The gauge symmetries are broken down to those of
the minimal supersymmetric standard model which is the effective theory below
10^16 GeV. The combination of the U(1)_X family symmetry and the Pati-Salam
gauge group leads to a successful and predictive set of Yukawa textures
involving two kinds of texture zeroes: horizontal and vertical texture zeroes.
We discuss both symmetric and non-symmetric textures in models of this kind,
and in the second case perform a detailed numerical fit to the charged fermion
mass and mixing data. Two of the Yukawa textures allow a low energy fit to the
data with a total chi^2 of 0.39 and 1.02 respectively, for three degrees of
freedom. We also make a first attempt at deriving the non - renormalisable
operators required for the Yukawa textures from string theory.
| [
{
"created": "Mon, 28 Oct 1996 17:14:11 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Mar 1997 11:10:50 GMT",
"version": "v2"
},
{
"created": "Tue, 18 Mar 1997 14:30:57 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Allanach",
"B. C.",
"",
"Rutherford"
],
[
"King",
"S. F.",
"",
"Southampton U."
],
[
"Leontaris",
"G. K.",
"",
"Ioannina U."
],
[
"Lola",
"S.",
"",
"CERN"
]
] | We discuss the origin of Yukawa textures in the string-inspired and string derived models based on the gauge group SU(4)xSU(2)_LxSU(2)_R supplemented by a U(1)_X gauged family symmetry. The gauge symmetries are broken down to those of the minimal supersymmetric standard model which is the effective theory below 10^16 GeV. The combination of the U(1)_X family symmetry and the Pati-Salam gauge group leads to a successful and predictive set of Yukawa textures involving two kinds of texture zeroes: horizontal and vertical texture zeroes. We discuss both symmetric and non-symmetric textures in models of this kind, and in the second case perform a detailed numerical fit to the charged fermion mass and mixing data. Two of the Yukawa textures allow a low energy fit to the data with a total chi^2 of 0.39 and 1.02 respectively, for three degrees of freedom. We also make a first attempt at deriving the non - renormalisable operators required for the Yukawa textures from string theory. |
hep-ph/9808404 | Bruce Bassett | Bruce A. Bassett (Oxford), David I. Kaiser (Harvard) and Roy Maartens
(Portsmouth) | General Relativistic effects in preheating | 10 pages. 1 .ps fig. Matches version to appear in Phys Lett B | Phys.Lett. B455 (1999) 84-89 | 10.1016/S0370-2693(99)00478-5 | HUTP-98/A058, PU-RCG-98/11 | hep-ph astro-ph gr-qc hep-th | null | General relativistic effects in the form of metric perturbations are usually
neglected in the preheating era that follows inflation. We argue that in
realistic multi-field models these effects are in fact crucial, and the fully
coupled system of metric and quantum field fluctuations needs to be considered.
Metric perturbations are resonantly amplified, breaking the scale-invariance of
the primordial spectrum, and in turn stimulate scalar field resonances via
gravitational rescattering. This non-gravitationally dominated nonlinear growth
of gravitational fluctuations may have significant effects on the Doppler peaks
in the cosmic background radiation, primordial black hole formation,
gravitational waves and nonthermal symmetry restoration.
| [
{
"created": "Tue, 25 Aug 1998 08:31:15 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Nov 1998 15:50:41 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Apr 1999 15:31:44 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Bassett",
"Bruce A.",
"",
"Oxford"
],
[
"Kaiser",
"David I.",
"",
"Harvard"
],
[
"Maartens",
"Roy",
"",
"Portsmouth"
]
] | General relativistic effects in the form of metric perturbations are usually neglected in the preheating era that follows inflation. We argue that in realistic multi-field models these effects are in fact crucial, and the fully coupled system of metric and quantum field fluctuations needs to be considered. Metric perturbations are resonantly amplified, breaking the scale-invariance of the primordial spectrum, and in turn stimulate scalar field resonances via gravitational rescattering. This non-gravitationally dominated nonlinear growth of gravitational fluctuations may have significant effects on the Doppler peaks in the cosmic background radiation, primordial black hole formation, gravitational waves and nonthermal symmetry restoration. |
1107.4309 | Luis Anchordoqui | Luis A. Anchordoqui, Ignatios Antoniadis, Haim Goldberg, Xing Huang,
Dieter Lust, Tomasz R. Taylor | Z'-gauge Bosons as Harbingers of Low Mass Strings | To be published in PRD | null | 10.1103/PhysRevD.85.086003 | MPP-2011-86; LMU-ASC 32/11; CERN-PH-TH/2011-180 | hep-ph hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Massive Z'-gauge bosons act as excellent harbingers for string
compactifications with a low string scale. In D-brane models they are
associated to U(1) gauge symmetries that are either anomalous in four
dimensions or exhibit a hidden higher dimensional anomaly. We discuss the
possible signals of massive Z'-gauge bosons at hadron collider machines
(Tevatron, LHC) in a minimal D-brane model consisting out of four stacks of
D-branes. In this construction, there are two massive gauge bosons, which can
be naturally associated with baryon number B and B-L (L being lepton number).
Here baryon number is always anomalous in four dimensions, whereas the presence
of a four-dimensional B-L anomaly depends on the U(1)-charges of the right
handed neutrinos. In case B-L is anomaly free, a mass hierarchy between the two
associated Z'-gauge bosons can be explained. In our phenomenological discussion
about the possible discovery of massive Z'-gauge bosons, we take as a benchmark
scenario the dijet plus W signal, recently observed by the CDF Collaboration at
Tevatron. It reveals an excess in the dijet mass range 150 GeV/c^2, 4.1\sigma
beyond SM expectations. We show that in the context of low-mass string theory
this excess can be associated with the production and decay of a leptophobic
Z', a singlet partner of SU(3) gluons coupled primarily to baryon number. Even
if the CDF signal disappears, as indicated by the more recent D0 results, our
analysis can still serve as the basis for future experimental search for
massive Z'-gauge bosons in low string scale models. We provide the relevant
cross sections for the production of Z'-gauge bosons in the TeV region, leading
to predictions that are within reach of the present or the next LHC run.
| [
{
"created": "Thu, 21 Jul 2011 16:50:06 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Aug 2011 13:35:58 GMT",
"version": "v2"
},
{
"created": "Sat, 24 Mar 2012 12:38:12 GMT",
"version": "v3"
}
] | 2013-05-30 | [
[
"Anchordoqui",
"Luis A.",
""
],
[
"Antoniadis",
"Ignatios",
""
],
[
"Goldberg",
"Haim",
""
],
[
"Huang",
"Xing",
""
],
[
"Lust",
"Dieter",
""
],
[
"Taylor",
"Tomasz R.",
""
]
] | Massive Z'-gauge bosons act as excellent harbingers for string compactifications with a low string scale. In D-brane models they are associated to U(1) gauge symmetries that are either anomalous in four dimensions or exhibit a hidden higher dimensional anomaly. We discuss the possible signals of massive Z'-gauge bosons at hadron collider machines (Tevatron, LHC) in a minimal D-brane model consisting out of four stacks of D-branes. In this construction, there are two massive gauge bosons, which can be naturally associated with baryon number B and B-L (L being lepton number). Here baryon number is always anomalous in four dimensions, whereas the presence of a four-dimensional B-L anomaly depends on the U(1)-charges of the right handed neutrinos. In case B-L is anomaly free, a mass hierarchy between the two associated Z'-gauge bosons can be explained. In our phenomenological discussion about the possible discovery of massive Z'-gauge bosons, we take as a benchmark scenario the dijet plus W signal, recently observed by the CDF Collaboration at Tevatron. It reveals an excess in the dijet mass range 150 GeV/c^2, 4.1\sigma beyond SM expectations. We show that in the context of low-mass string theory this excess can be associated with the production and decay of a leptophobic Z', a singlet partner of SU(3) gluons coupled primarily to baryon number. Even if the CDF signal disappears, as indicated by the more recent D0 results, our analysis can still serve as the basis for future experimental search for massive Z'-gauge bosons in low string scale models. We provide the relevant cross sections for the production of Z'-gauge bosons in the TeV region, leading to predictions that are within reach of the present or the next LHC run. |
1308.4455 | Ho-Meoyng Choi | Ho-Meoyng Choi (Kyungpook National Univ.) and Chueng-Ryong Ji (North
Carolina State Univ.) | Self-consistent covariant description of vector meson decay constants
and chirality-even quark-antiquark distribution amplitudes up to twist-3 in
the light-front quark model | 16 pages, 4 figures | Physical Review D 89, 033011(2014) | 10.1103/PhysRevD.89.033011 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Although the meson decay amplitude described by a two-point function may be
regarded as one of the simplest possible physical observable, it is interesting
that this apparently simple amplitude bears abundant fundamental informations
on QCD vacuum dynamics and chiral symmetry. The light-front zero-mode issue of
the vector meson decay constant $f_V$ is in this respect highly non-trivial and
deserves careful analyses. We discuss the zero-mode issue in the light-front
quark model (LFQM) prediction of $f_V$ from the perspective of the vacuum
fluctuation consistent with the chiral symmetry of QCD. We extend the exactly
solvable manifestly covariant Bethe-Salpeter model calculation to the more
phenomenologically accessible realistic LFQM and present a self-consistent
covariant description of $f_V$ analyzing the twist-2 and twist-3
quark-antiquark distribution amplitudes with even chirality.
| [
{
"created": "Wed, 21 Aug 2013 00:59:56 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Dec 2013 09:01:12 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Feb 2014 02:05:55 GMT",
"version": "v3"
}
] | 2015-06-16 | [
[
"Choi",
"Ho-Meoyng",
"",
"Kyungpook National Univ."
],
[
"Ji",
"Chueng-Ryong",
"",
"North\n Carolina State Univ."
]
] | Although the meson decay amplitude described by a two-point function may be regarded as one of the simplest possible physical observable, it is interesting that this apparently simple amplitude bears abundant fundamental informations on QCD vacuum dynamics and chiral symmetry. The light-front zero-mode issue of the vector meson decay constant $f_V$ is in this respect highly non-trivial and deserves careful analyses. We discuss the zero-mode issue in the light-front quark model (LFQM) prediction of $f_V$ from the perspective of the vacuum fluctuation consistent with the chiral symmetry of QCD. We extend the exactly solvable manifestly covariant Bethe-Salpeter model calculation to the more phenomenologically accessible realistic LFQM and present a self-consistent covariant description of $f_V$ analyzing the twist-2 and twist-3 quark-antiquark distribution amplitudes with even chirality. |
hep-ph/0202186 | Baldicchi Massimiliano | G. M. Prosperi | Confinement and bound states in QCD | 11 pages, 2 figures, Conference: Color Confinement and Hadrons
(Confinement 2000) Osaka, Japan | null | null | null | hep-ph | null | I revue the so called Wilson loop approach to bound state problem in QCD. I
shall show how using appropriate path integral representations for the quark
propagator in an external field it is possible to obtain corresponding path
integral representations for various types of gauge invariant Green functions
which have the important feature of involving the gauge field only trough
Wilson loop correlators or their generalizations. Two different kinds of
representations are used, one given in the form of a semi-relativistic
expansion, the second completely relativistic of the Feynmann-Schwinger type.
In this way starting from reasonable ansatz on the non perturbative part of the
Wilson correlator one can obtain: expressions for the semi relativistic (spin
dependent and momentum dependent) q \bar q and 3q potentials, a ``second
order'' q \bar q Bethe-Salpeter equation and and a related Dyson-Schwinger
equation. I shall concentrate on the three quark potential for which new
controversial results have been obtained by lattice numerical simulations and
on a three dimensional reduction of the BS equation obtained in the form of the
eigenvalue equation of of a squared or a usual mass operator. We shall report
on a numerical resolution of such equations which seems to give a comprehensive
reproduction of the entire meson spectrum with the exception of light
pseudo-scalar bound states for which a complete four dimensional treatment
should be necessary.
| [
{
"created": "Tue, 19 Feb 2002 17:06:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Prosperi",
"G. M.",
""
]
] | I revue the so called Wilson loop approach to bound state problem in QCD. I shall show how using appropriate path integral representations for the quark propagator in an external field it is possible to obtain corresponding path integral representations for various types of gauge invariant Green functions which have the important feature of involving the gauge field only trough Wilson loop correlators or their generalizations. Two different kinds of representations are used, one given in the form of a semi-relativistic expansion, the second completely relativistic of the Feynmann-Schwinger type. In this way starting from reasonable ansatz on the non perturbative part of the Wilson correlator one can obtain: expressions for the semi relativistic (spin dependent and momentum dependent) q \bar q and 3q potentials, a ``second order'' q \bar q Bethe-Salpeter equation and and a related Dyson-Schwinger equation. I shall concentrate on the three quark potential for which new controversial results have been obtained by lattice numerical simulations and on a three dimensional reduction of the BS equation obtained in the form of the eigenvalue equation of of a squared or a usual mass operator. We shall report on a numerical resolution of such equations which seems to give a comprehensive reproduction of the entire meson spectrum with the exception of light pseudo-scalar bound states for which a complete four dimensional treatment should be necessary. |
0912.0113 | Damiano Anselmi | Damiano Anselmi and Martina Taiuti | Renormalization Of High-Energy Lorentz Violating QED | 17 pages, 1 figure; v2: typos corrected, some more comments, PRD
published version | Phys.Rev.D81:085042,2010 | 10.1103/PhysRevD.81.085042 | IFUP-TH 2009/20 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a QED extension that is unitary, CPT invariant and
super-renormalizable, but violates Lorentz symmetry at high energies, and
contains higher-dimension operators (LVQED). Divergent diagrams are only one-
and two-loop. We compute the one-loop renormalizations at high and low energies
and analyse the relation between them. It emerges that the power-like
divergences of the low-energy theory are multiplied by arbitrary constants,
inherited by the high-energy theory, and therefore can be set to zero at no
cost, bypassing the hierarchy problem.
| [
{
"created": "Tue, 1 Dec 2009 10:12:35 GMT",
"version": "v1"
},
{
"created": "Sun, 9 May 2010 15:57:04 GMT",
"version": "v2"
}
] | 2010-05-12 | [
[
"Anselmi",
"Damiano",
""
],
[
"Taiuti",
"Martina",
""
]
] | We study a QED extension that is unitary, CPT invariant and super-renormalizable, but violates Lorentz symmetry at high energies, and contains higher-dimension operators (LVQED). Divergent diagrams are only one- and two-loop. We compute the one-loop renormalizations at high and low energies and analyse the relation between them. It emerges that the power-like divergences of the low-energy theory are multiplied by arbitrary constants, inherited by the high-energy theory, and therefore can be set to zero at no cost, bypassing the hierarchy problem. |
hep-ph/9710305 | Jose F. Nieves | Juan Carlos D'Olivo and Jose F. Nieves | Nucleon effects on the photon dispersion relations in matter | RevTeX | Phys.Rev. D57 (1998) 3116-3130 | 10.1103/PhysRevD.57.3116 | null | hep-ph | null | We calculate the nucleon contribution to the photon self-energy in a plasma,
including the effect of the anomalous magnetic moment of the nucleons. General
formulas for the transverse and longitudinal components of the self-energy are
obtained and we give explicit results in various limits of physical interest.
The formulas are relevant for the study of the photon dispersion relations and
the dynamical susceptibility in a nuclear medium such as the core of a
supernova, and has implications with regard to the recent suggestion that the
Cerenkov process $\nu \to \nu\gamma$ can take place in such a system.
| [
{
"created": "Thu, 9 Oct 1997 21:44:39 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"D'Olivo",
"Juan Carlos",
""
],
[
"Nieves",
"Jose F.",
""
]
] | We calculate the nucleon contribution to the photon self-energy in a plasma, including the effect of the anomalous magnetic moment of the nucleons. General formulas for the transverse and longitudinal components of the self-energy are obtained and we give explicit results in various limits of physical interest. The formulas are relevant for the study of the photon dispersion relations and the dynamical susceptibility in a nuclear medium such as the core of a supernova, and has implications with regard to the recent suggestion that the Cerenkov process $\nu \to \nu\gamma$ can take place in such a system. |
0809.0779 | Ulrich Ellwanger | Ulrich Ellwanger | The constrained NMSSM: mSUGRA and GMSB | 6 pages, 5 Figures. Plenary talk given at SUSY 08 | AIP Conf.Proc.1078:73-78,2009 | 10.1063/1.3052054 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review different constrained versions of the NMSSM: the fully constrained
cNMSSM with universal boundary conditions for gauginos and all soft scalar
masses and trilinear couplings, and the NMSSM with soft terms from Gauge
Mediated Supersymmetry Breaking. Regarding the fully constrained cNMSSM, after
imposing LEP constraints and the correct dark matter relic density, one single
parameter is sufficient to describe the entire Higgs and sparticle spectrum of
the model, which then contains always a singlino LSP. The NMSSM with soft terms
from GMSB is phenomenologically viable if (and only if) the singlet is allowed
to couple directly to the messenger sector; then various ranges in parameter
space satisfy constraints from colliders and precision observables. Motivations
for and phenomenological features of extra U(1)' gauge symmetries are briefly
reviewed.
| [
{
"created": "Thu, 4 Sep 2008 09:31:14 GMT",
"version": "v1"
}
] | 2009-02-02 | [
[
"Ellwanger",
"Ulrich",
""
]
] | We review different constrained versions of the NMSSM: the fully constrained cNMSSM with universal boundary conditions for gauginos and all soft scalar masses and trilinear couplings, and the NMSSM with soft terms from Gauge Mediated Supersymmetry Breaking. Regarding the fully constrained cNMSSM, after imposing LEP constraints and the correct dark matter relic density, one single parameter is sufficient to describe the entire Higgs and sparticle spectrum of the model, which then contains always a singlino LSP. The NMSSM with soft terms from GMSB is phenomenologically viable if (and only if) the singlet is allowed to couple directly to the messenger sector; then various ranges in parameter space satisfy constraints from colliders and precision observables. Motivations for and phenomenological features of extra U(1)' gauge symmetries are briefly reviewed. |
hep-ph/9907548 | Maurizio Lusignoli | Pasquale Di Bari, Paolo Lipari and Maurizio Lusignoli (INFN, Sezione
di Roma, and Dipartimento di Fisica, Universita' di Roma "La Sapienza", Roma,
Italy) | The $\nu_\mu \leftrightarrow \nu_s$ interpretation of the atmospheric
neutrino data and cosmological constraints | 45 pages, 14 figures, LaTeX2e; added discussion in subsection 6.3; to
appear in International Journal of Modern Physics A | Int.J.Mod.Phys. A15 (2000) 2289-2328 | 10.1142/S0217751X00000951 | ROME1-1259/99 | hep-ph astro-ph | null | The data on atmospheric neutrinos can be explained assuming the existence of
oscillations between muon neutrinos and light sterile neutrinos with mixing
close to maximal, and Delta_m^2 approximately equal to 3 E-3 (eV^2). This
interpretation of the data is in potential conflict with the successes of big
bang nucleosynthesis (BBN), since oscillations can result in a too large
contribution of the sterile state to the energy density of the universe at the
epoch of nucleosynthesis. The possibility to evade these cosmological
constraints has been recently the object of some controversy. In this work we
rediscuss this problem and find that the inclusion of a small mixing of the
sterile state with tau neutrino can result in the generation of a large lepton
asymmetry that strongly suppress the muon-sterile neutrino oscillations
eliminating the possible conflict with BBN bounds. In this scheme the mass of
the tau neutrino must be larger than few eV's and is compatible with
cosmological bounds. Our calculation is performed using a Pauli-Boltzmann
method. In this approach it is also possible to develop analytic calculations
that allow physical insight in the processes considered and give support to the
numerical results.
| [
{
"created": "Thu, 29 Jul 1999 14:54:48 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Dec 1999 16:54:21 GMT",
"version": "v2"
}
] | 2017-09-06 | [
[
"Di Bari",
"Pasquale",
"",
"INFN, Sezione\n di Roma, and Dipartimento di Fisica, Universita' di Roma \"La Sapienza\", Roma,\n Italy"
],
[
"Lipari",
"Paolo",
"",
"INFN, Sezione\n di Roma, and Dipartimento di Fisica, Universita' di Roma \"La Sapienza\", Roma,\n Italy"
],
... | The data on atmospheric neutrinos can be explained assuming the existence of oscillations between muon neutrinos and light sterile neutrinos with mixing close to maximal, and Delta_m^2 approximately equal to 3 E-3 (eV^2). This interpretation of the data is in potential conflict with the successes of big bang nucleosynthesis (BBN), since oscillations can result in a too large contribution of the sterile state to the energy density of the universe at the epoch of nucleosynthesis. The possibility to evade these cosmological constraints has been recently the object of some controversy. In this work we rediscuss this problem and find that the inclusion of a small mixing of the sterile state with tau neutrino can result in the generation of a large lepton asymmetry that strongly suppress the muon-sterile neutrino oscillations eliminating the possible conflict with BBN bounds. In this scheme the mass of the tau neutrino must be larger than few eV's and is compatible with cosmological bounds. Our calculation is performed using a Pauli-Boltzmann method. In this approach it is also possible to develop analytic calculations that allow physical insight in the processes considered and give support to the numerical results. |
hep-ph/0504159 | Pavel Pobylitsa | P.V. Pobylitsa | Baryon wave function: Large-Nc QCD and lessons from models | 58 pages | null | null | null | hep-ph | null | The structure of the 1/Nc expansion for the baryon distribution amplitude in
QCD is tested using quark models. Earlier conjectures about this structure
based on the evolution equation and on the soft-pion theorem are confirmed by
the model analysis. The problem of the calculation of the baryon wave function
at large Nc is reduced to the analysis of equations of motion for an effective
classical dynamical system.
| [
{
"created": "Mon, 18 Apr 2005 19:45:12 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pobylitsa",
"P. V.",
""
]
] | The structure of the 1/Nc expansion for the baryon distribution amplitude in QCD is tested using quark models. Earlier conjectures about this structure based on the evolution equation and on the soft-pion theorem are confirmed by the model analysis. The problem of the calculation of the baryon wave function at large Nc is reduced to the analysis of equations of motion for an effective classical dynamical system. |
hep-ph/9911312 | Shinya Kanemura | S. Kanemura (ITP, Univ. Karlsruhe), T. Kasai (Theory Group, KEK), and
Y. Okada (Theory Group, KEK) | Upper and lower bounds of the lightest CP-even Higgs boson in the
two-Higgs-doublet model | Talk given by S. Kanemura at the 2nd ECFA/DESY LCWS in Obernai,
France (16-19. October 1999), 7 pages including 3 figures | null | 10.1016/S0370-2693(99)01351-9 | KA-TP-18-1999, KEK-TH-660 | hep-ph | null | By imposing validity of the perturbation and stability of vacuum up to an
energy scale $\Lambda$ ($\leq 10^{19}$ GeV), we evaluate mass bounds of the
lightest CP-even Higgs-boson mass ($m_h$) in the two-Higgs-doublet model (2HDM)
with a softly-broken discrete symmetry. The most general bounds are obtained as
a function of $\Lambda$ vering all the free parameters under the experimental
constraint from the $rho$ parameter and the b \to s \gamma$ results. We find
that, while the upper bound is almost the same as in the SM, the lower bound is
significantly reduced. In the decoupling regime where the model behaves like
the SM at low energy, the lower bound is given, for example, by about 100 GeV
for $\Lambda = 10^{19}$ GeV and $m_t = 175$ GeV, which is smaller by about 40
GeV than the corresponding lower bound in the SM. In general case, the $m_h$ is
no longer bounded from below by these conditions. If we consider the
experimental $b \to s \gamma$ constraint, small $m_h$ are excluded in Model II
of the 2HDM.
| [
{
"created": "Thu, 11 Nov 1999 11:57:51 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kanemura",
"S.",
"",
"ITP, Univ. Karlsruhe"
],
[
"Kasai",
"T.",
"",
"Theory Group, KEK"
],
[
"Okada",
"Y.",
"",
"Theory Group, KEK"
]
] | By imposing validity of the perturbation and stability of vacuum up to an energy scale $\Lambda$ ($\leq 10^{19}$ GeV), we evaluate mass bounds of the lightest CP-even Higgs-boson mass ($m_h$) in the two-Higgs-doublet model (2HDM) with a softly-broken discrete symmetry. The most general bounds are obtained as a function of $\Lambda$ vering all the free parameters under the experimental constraint from the $rho$ parameter and the b \to s \gamma$ results. We find that, while the upper bound is almost the same as in the SM, the lower bound is significantly reduced. In the decoupling regime where the model behaves like the SM at low energy, the lower bound is given, for example, by about 100 GeV for $\Lambda = 10^{19}$ GeV and $m_t = 175$ GeV, which is smaller by about 40 GeV than the corresponding lower bound in the SM. In general case, the $m_h$ is no longer bounded from below by these conditions. If we consider the experimental $b \to s \gamma$ constraint, small $m_h$ are excluded in Model II of the 2HDM. |
1508.06014 | Sibo Zheng | Qiurong Mou and Sibo Zheng | A Heavy Scalar at the LHC from Vector Boson Fusion | Published version | Advances in High Energy Physics 2018 (2018) 9314613 | 10.1155/2018/9314613 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | A hypothetical scalar mixed with the standard model Higgs appears in few
contexts of new physics. This study addresses the question what mass range is
in the reach of $14$ TeV LHC given different magnitudes of mixing angle
$\alpha$, where event simulations are based on production from vector boson
fusion channel and decays into SM leptons through ${\rm WW}$ or ${\rm ZZ}$. It
indicates that heavy scalar mass up to $539$ GeV and $937$ GeV can be excluded
by integrated luminosity of $300$ $\rm{fb}^{-1}$ and $3000$ $\rm{fb}^{-1}$
respectively for $\sin^{2}\alpha$ larger than $0.04$.
| [
{
"created": "Tue, 25 Aug 2015 02:51:12 GMT",
"version": "v1"
},
{
"created": "Sun, 4 Mar 2018 09:11:13 GMT",
"version": "v2"
},
{
"created": "Thu, 26 Jul 2018 08:03:12 GMT",
"version": "v3"
}
] | 2018-08-15 | [
[
"Mou",
"Qiurong",
""
],
[
"Zheng",
"Sibo",
""
]
] | A hypothetical scalar mixed with the standard model Higgs appears in few contexts of new physics. This study addresses the question what mass range is in the reach of $14$ TeV LHC given different magnitudes of mixing angle $\alpha$, where event simulations are based on production from vector boson fusion channel and decays into SM leptons through ${\rm WW}$ or ${\rm ZZ}$. It indicates that heavy scalar mass up to $539$ GeV and $937$ GeV can be excluded by integrated luminosity of $300$ $\rm{fb}^{-1}$ and $3000$ $\rm{fb}^{-1}$ respectively for $\sin^{2}\alpha$ larger than $0.04$. |
1405.7427 | Russell TerBeek III | Jayden L. Newstead, Russell H. TerBeek | The Reach of Threshold-Corrected Dark QCD | 7 pages, 8 figures | Phys. Rev. D 90, 074008 (2014) | 10.1103/PhysRevD.90.074008 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a recently-proposed model which posits the existence of composite
dark matter, wherein dark "quarks" transforming as fundamentals under an
$SU(3)_d$ gauge group undergo a confining phase and form dark baryons. The
model attempts to explain both the $\mathcal{O}(1)$ relic density ratio,
$\Omega_{\mathrm{dark}}/\Omega_{\mathrm{baryon}}\sim 5.4$, as well as the
asymmetric production of both dark and baryonic matter via leptogenesis. Though
the solution of $\beta$ functions for $SU(3)_c$ and $SU(3)_d$ constitutes the
main drive of the model, no threshold corrections were taken into account as
the renormalization scale crosses the mass threshold of the heavy new fields in
the model. We extend this work by explicitly calculating the
threshold-corrected renormalization-group flow for the theory using an
effective-field matching technique. We find that the theory has a much wider
range of applicability than previously thought, and that a significant fraction
of models (defined by the number of fields contained therein) is able to
account for the observed relic density.
| [
{
"created": "Thu, 29 May 2014 00:04:46 GMT",
"version": "v1"
}
] | 2014-10-08 | [
[
"Newstead",
"Jayden L.",
""
],
[
"TerBeek",
"Russell H.",
""
]
] | We consider a recently-proposed model which posits the existence of composite dark matter, wherein dark "quarks" transforming as fundamentals under an $SU(3)_d$ gauge group undergo a confining phase and form dark baryons. The model attempts to explain both the $\mathcal{O}(1)$ relic density ratio, $\Omega_{\mathrm{dark}}/\Omega_{\mathrm{baryon}}\sim 5.4$, as well as the asymmetric production of both dark and baryonic matter via leptogenesis. Though the solution of $\beta$ functions for $SU(3)_c$ and $SU(3)_d$ constitutes the main drive of the model, no threshold corrections were taken into account as the renormalization scale crosses the mass threshold of the heavy new fields in the model. We extend this work by explicitly calculating the threshold-corrected renormalization-group flow for the theory using an effective-field matching technique. We find that the theory has a much wider range of applicability than previously thought, and that a significant fraction of models (defined by the number of fields contained therein) is able to account for the observed relic density. |
hep-ph/0410263 | Erik Barto\v{s} | E. Bartos, S. R. Gevorkyan, E. A. Kuraev, N. N. Nikolaev | Multiple exchanges in lepton pair production in high--energy heavy ion
collisions | 20 pages, 7 figures, REVTeX4 format | J.Exp.Theor.Phys. 100 (2005) 645-655; Zh.Eksp.Teor.Fiz. 100 (2005)
732-743 | 10.1134/1.1926426 | null | hep-ph | null | The recent analysis of nuclear distortions in DIS off nuclei revealed a
breaking of the conventional hard factorization for multijet observable. The
related pQCD analysis of distortion effects for jet production in
nucleus-nucleus collisions is as yet lacking. As a testing ground for such an
analysis we consider the Abelian problem of higher order Coulomb distortions of
the spectrum of lepton pairs produced in peripheral nuclear collisions. We
report an explicit calculation of the contribution to the lepton pair
production in the collision of two photons from one nucleus with two photons
from the other nucleus, $2\gamma + 2\gamma \to \m{l}^+\m{l}^-$. The dependence
of this amplitude on the transverse momenta has a highly nontrivial form the
origin of which can be traced to the mismatch of the conservation of the
Sudakov components for the momentum of leptons in the Coulomb field of the
oppositely moving nuclei.
The result suggests that the familiar eikonalization of Coulomb distortions
breaks down for the oppositely moving Coulomb centers, which is bad news from
the point of view of extensions to the pQCD treatment of jet production in
nuclear collisions. On the other hand, we notice that the amplitude for the
$2\gamma + 2\gamma \to \m{l}^+\m{l}^-$ process has a logarithmic enhancement
for the lepton pairs with large transverse momentum, which is absent for
$n\gamma + m\gamma \to \m{l}^+\m{l}^-$ processes with $m,n > 2$.
We discuss the general structure of multiple exchanges and show how to deal
with higher order terms which cannot be eikonalized.
| [
{
"created": "Tue, 19 Oct 2004 14:34:54 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Bartos",
"E.",
""
],
[
"Gevorkyan",
"S. R.",
""
],
[
"Kuraev",
"E. A.",
""
],
[
"Nikolaev",
"N. N.",
""
]
] | The recent analysis of nuclear distortions in DIS off nuclei revealed a breaking of the conventional hard factorization for multijet observable. The related pQCD analysis of distortion effects for jet production in nucleus-nucleus collisions is as yet lacking. As a testing ground for such an analysis we consider the Abelian problem of higher order Coulomb distortions of the spectrum of lepton pairs produced in peripheral nuclear collisions. We report an explicit calculation of the contribution to the lepton pair production in the collision of two photons from one nucleus with two photons from the other nucleus, $2\gamma + 2\gamma \to \m{l}^+\m{l}^-$. The dependence of this amplitude on the transverse momenta has a highly nontrivial form the origin of which can be traced to the mismatch of the conservation of the Sudakov components for the momentum of leptons in the Coulomb field of the oppositely moving nuclei. The result suggests that the familiar eikonalization of Coulomb distortions breaks down for the oppositely moving Coulomb centers, which is bad news from the point of view of extensions to the pQCD treatment of jet production in nuclear collisions. On the other hand, we notice that the amplitude for the $2\gamma + 2\gamma \to \m{l}^+\m{l}^-$ process has a logarithmic enhancement for the lepton pairs with large transverse momentum, which is absent for $n\gamma + m\gamma \to \m{l}^+\m{l}^-$ processes with $m,n > 2$. We discuss the general structure of multiple exchanges and show how to deal with higher order terms which cannot be eikonalized. |
2107.01827 | Anatoly Butkevich | A.V. Butkevich | Analysis of flux-integrated semi-exclusive cross sections for charged
current quasi-elastic neutrino scattering off 40Ar at energies available at
the MicroBooNE experiment | 17 pages, 7 figures | null | 10.1103/PhysRevC.105.025501 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | Flux-integrated semi-exclusive differential and integral cross sections for
quasi-elastic neutrino charged-current scattering on argon are analyzed. We
calculate these cross sections using the relativistic distorted-wave impulse
approximation and compare with recent MicroBooNE data. We found that the
measured cross sections can be described well within the experimental
uncertainties with value of the nucleon axial mass $1 < M_A < 1.2$ GeV. The
contribution of the exclusive channel $\boldmath{(\nu_{\mu}, \mu p)}$ to the
flux-integrated inclusive cross sections is about 50\%.
| [
{
"created": "Mon, 5 Jul 2021 07:24:23 GMT",
"version": "v1"
}
] | 2022-02-23 | [
[
"Butkevich",
"A. V.",
""
]
] | Flux-integrated semi-exclusive differential and integral cross sections for quasi-elastic neutrino charged-current scattering on argon are analyzed. We calculate these cross sections using the relativistic distorted-wave impulse approximation and compare with recent MicroBooNE data. We found that the measured cross sections can be described well within the experimental uncertainties with value of the nucleon axial mass $1 < M_A < 1.2$ GeV. The contribution of the exclusive channel $\boldmath{(\nu_{\mu}, \mu p)}$ to the flux-integrated inclusive cross sections is about 50\%. |
0711.0950 | Harmen J. Warringa | Dmitri E. Kharzeev, Larry D. McLerran, Harmen J. Warringa | The effects of topological charge change in heavy ion collisions: "Event
by event P and CP violation" | 33 pages, 7 figures | Nucl.Phys.A803:227-253,2008 | 10.1016/j.nuclphysa.2008.02.298 | null | hep-ph nucl-ex nucl-th | null | Quantum chromodynamics (QCD) contains field configurations which can be
characterized by a topological invariant, the winding number Q_w.
Configurations with nonzero Q_w break the charge-parity CP symmetry of QCD. We
consider a novel mechanism by which these configurations can separate charge in
the presence of a background magnetic field - the "Chiral Magnetic Effect". We
argue that sufficiently large magnetic fields are created in heavy ion
collisions so that the Chiral Magnetic Effect causes preferential emission of
charged particles along the direction of angular momentum. Since separation of
charge is CP-odd, any observation of the Chiral Magnetic Effect could provide a
clear demonstration of the topological nature of the QCD vacuum. We give an
estimate of the effect and conclude that it might be observed experimentally.
| [
{
"created": "Tue, 6 Nov 2007 19:00:09 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Kharzeev",
"Dmitri E.",
""
],
[
"McLerran",
"Larry D.",
""
],
[
"Warringa",
"Harmen J.",
""
]
] | Quantum chromodynamics (QCD) contains field configurations which can be characterized by a topological invariant, the winding number Q_w. Configurations with nonzero Q_w break the charge-parity CP symmetry of QCD. We consider a novel mechanism by which these configurations can separate charge in the presence of a background magnetic field - the "Chiral Magnetic Effect". We argue that sufficiently large magnetic fields are created in heavy ion collisions so that the Chiral Magnetic Effect causes preferential emission of charged particles along the direction of angular momentum. Since separation of charge is CP-odd, any observation of the Chiral Magnetic Effect could provide a clear demonstration of the topological nature of the QCD vacuum. We give an estimate of the effect and conclude that it might be observed experimentally. |
2402.06723 | Wouter Dekens | Maria Dawid, Vincenzo Cirigliano, Wouter Dekens | One-loop analysis of $\beta$ decays in SMEFT | 25 pages, 2 figures | null | null | INT-PUB-24-004 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We perform a loop-level analysis of charged-current (CC) processes involving
light leptons and quarks within the Standard Model Effective Field Theory
(SMEFT). This work is motivated by the high precision reached in experiment and
Standard Model calculations for CC decays of mesons, neutron, and nuclei, and
by a lingering tension in the Cabibbo universality test. We identify the SMEFT
operators that induce the largest loop-level contributions to CC processes.
These include four-quark and four-fermion semileptonic operators involving two
third-generation quarks. We discuss the available constraints on the relevant
effective couplings and along the way we derive new loop-level bounds from $K
\to \pi \nu \bar \nu$ on four-quark operators involving two top quarks. We find
that low-energy CC processes are quite competitive with other probes, set
constraints that do not depend on flavor-symmetry assumptions, and probe
operators involving third-generation quarks up to effective scales of
$\Lambda\simeq 8$ TeV. Finally, we briefly discuss single-field ultraviolet
completions that could induce the relevant operators.
| [
{
"created": "Fri, 9 Feb 2024 19:00:03 GMT",
"version": "v1"
}
] | 2024-02-13 | [
[
"Dawid",
"Maria",
""
],
[
"Cirigliano",
"Vincenzo",
""
],
[
"Dekens",
"Wouter",
""
]
] | We perform a loop-level analysis of charged-current (CC) processes involving light leptons and quarks within the Standard Model Effective Field Theory (SMEFT). This work is motivated by the high precision reached in experiment and Standard Model calculations for CC decays of mesons, neutron, and nuclei, and by a lingering tension in the Cabibbo universality test. We identify the SMEFT operators that induce the largest loop-level contributions to CC processes. These include four-quark and four-fermion semileptonic operators involving two third-generation quarks. We discuss the available constraints on the relevant effective couplings and along the way we derive new loop-level bounds from $K \to \pi \nu \bar \nu$ on four-quark operators involving two top quarks. We find that low-energy CC processes are quite competitive with other probes, set constraints that do not depend on flavor-symmetry assumptions, and probe operators involving third-generation quarks up to effective scales of $\Lambda\simeq 8$ TeV. Finally, we briefly discuss single-field ultraviolet completions that could induce the relevant operators. |
hep-ph/0108106 | Marek Karliner | Marek Karliner (Tel-Aviv University) | A possible resolution of the e+e- --> Nbar N puzzle | Invited talk at the workshop "e+e- Physics at Intermediate Energies",
SLAC, April 30 - May 2, 2001; paper No. W10; 6 pages, 6 figures | eConf C010430 (2001) W10 | null | null | hep-ph | null | We sketch some recent ideas proposed as the mechanism behind the puzzling
experimental results on baryon-antibaryon production in e+e- annihilation close
to threshold. The essential new point in the proposed mechanism is that it is a
two-stage process, with a coherent state of pions serving as an intermediary
between e+e- and the baryon-antibaryon system. Skyrmion-antiskyrmion
annihilation is proposed as a concrete computational framework for a
quantitative description of the baryon-antibaryon annihilation. We also point
out the possible connection to similarly puzzling data on baryon-antibaryon
production in photon-photon collision.
| [
{
"created": "Sun, 12 Aug 2001 20:05:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Karliner",
"Marek",
"",
"Tel-Aviv University"
]
] | We sketch some recent ideas proposed as the mechanism behind the puzzling experimental results on baryon-antibaryon production in e+e- annihilation close to threshold. The essential new point in the proposed mechanism is that it is a two-stage process, with a coherent state of pions serving as an intermediary between e+e- and the baryon-antibaryon system. Skyrmion-antiskyrmion annihilation is proposed as a concrete computational framework for a quantitative description of the baryon-antibaryon annihilation. We also point out the possible connection to similarly puzzling data on baryon-antibaryon production in photon-photon collision. |
hep-ph/0702193 | Michael Gronau | Michael Gronau and Jonathan L. Rosner | Isospin of new physics in $|\Delta S|=1$ charmless B decays | 22 pages, to be published in Phys. Rev. D | Phys.Rev.D75:094006,2007 | 10.1103/PhysRevD.75.094006 | EFI 07-06, TECHNION-PH-2007-05 | hep-ph hep-ex | null | New physics (NP) in charmless strangeness-changing $B$ and $B_s$ decays,
which are dominated by the $b \to s$ penguin amplitudes, can either preserve
isospin or change it by one unit. A general formalism is presented studying
pairs of processes related to each other by isospin reflection. We discuss
information on $\Delta I$ in NP amplitudes, provided by time-integrated
CP-violating rate asymmetries in $B^+$ and $B^0$ decays (or in $B_s$ decays),
differences between rates for isospin-reflected processes, and coefficients $S$
of $\sin \Delta m t$ in time-dependent CP asymmetries. These four asymmetries
in $B^+$ and $B^0$ decays (or five asymmetries in $B_s$ decays) are shown to
determine the magnitude and CP-violating phase of a potential isovector NP
amplitude, and the imaginary part of an isoscalar amplitude, assuming that
strong phases in NP amplitudes are negligible. This information may be compared
with predictions of specific models, for which we discuss a few examples.
| [
{
"created": "Mon, 19 Feb 2007 18:08:46 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Feb 2007 20:41:59 GMT",
"version": "v2"
},
{
"created": "Tue, 27 Feb 2007 10:38:57 GMT",
"version": "v3"
},
{
"created": "Wed, 28 Feb 2007 20:14:50 GMT",
"version": "v4"
},
{
"c... | 2008-11-26 | [
[
"Gronau",
"Michael",
""
],
[
"Rosner",
"Jonathan L.",
""
]
] | New physics (NP) in charmless strangeness-changing $B$ and $B_s$ decays, which are dominated by the $b \to s$ penguin amplitudes, can either preserve isospin or change it by one unit. A general formalism is presented studying pairs of processes related to each other by isospin reflection. We discuss information on $\Delta I$ in NP amplitudes, provided by time-integrated CP-violating rate asymmetries in $B^+$ and $B^0$ decays (or in $B_s$ decays), differences between rates for isospin-reflected processes, and coefficients $S$ of $\sin \Delta m t$ in time-dependent CP asymmetries. These four asymmetries in $B^+$ and $B^0$ decays (or five asymmetries in $B_s$ decays) are shown to determine the magnitude and CP-violating phase of a potential isovector NP amplitude, and the imaginary part of an isoscalar amplitude, assuming that strong phases in NP amplitudes are negligible. This information may be compared with predictions of specific models, for which we discuss a few examples. |
1808.01419 | Xin-Qiang Li | Quan-Yi Hu, Xin-Qiang Li, Yu Muramatsu, and Ya-Dong Yang | R-parity violating solutions to the $R_{D^{(\ast)}}$ anomaly and their
GUT-scale unifications | 21 pages, 2 tables, 6 figures; more discussions and references added,
final version to be published in PRD | Phys. Rev. D 99, 015008 (2019) | 10.1103/PhysRevD.99.015008 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, several $B$-physics experiments report interesting anomalies in the
semi-leptonic decays of $B$-mesons, such as the excess in the $R_{D^{(\ast)}}$
measurements. These anomalies seem to suggest intriguing hints of lepton flavor
non-universality, and the R-parity violating (RPV) interactions are candidates
for explaining this non-universality. In this paper, we discuss the RPV
interactions for resolving the $R_{D^{(\ast)}}$ anomaly with the Grand Unified
Theory (GUT) assumption. To solve the $R_{D^{(\ast)}}$ anomaly, it is known
that large RPV couplings and around $1~{\rm TeV}$ sfermion masses are required.
At the same time, large RPV couplings are conducive to realize the bottom-tau
Yukawa unification which appears in the GUT models. On the other hand, there
are problems for realizing favorable sfermion masses in the constrained minimal
supersymetric standard model. To resolve these problems, we show that two
non-universalities, the non-universal sfermion masses and the non-universal
gaugino masses, are favorable.
| [
{
"created": "Sat, 4 Aug 2018 03:47:42 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Jan 2019 06:27:45 GMT",
"version": "v2"
}
] | 2019-01-09 | [
[
"Hu",
"Quan-Yi",
""
],
[
"Li",
"Xin-Qiang",
""
],
[
"Muramatsu",
"Yu",
""
],
[
"Yang",
"Ya-Dong",
""
]
] | Recently, several $B$-physics experiments report interesting anomalies in the semi-leptonic decays of $B$-mesons, such as the excess in the $R_{D^{(\ast)}}$ measurements. These anomalies seem to suggest intriguing hints of lepton flavor non-universality, and the R-parity violating (RPV) interactions are candidates for explaining this non-universality. In this paper, we discuss the RPV interactions for resolving the $R_{D^{(\ast)}}$ anomaly with the Grand Unified Theory (GUT) assumption. To solve the $R_{D^{(\ast)}}$ anomaly, it is known that large RPV couplings and around $1~{\rm TeV}$ sfermion masses are required. At the same time, large RPV couplings are conducive to realize the bottom-tau Yukawa unification which appears in the GUT models. On the other hand, there are problems for realizing favorable sfermion masses in the constrained minimal supersymetric standard model. To resolve these problems, we show that two non-universalities, the non-universal sfermion masses and the non-universal gaugino masses, are favorable. |
0907.1577 | Robert Shrock | Shmuel Nussinov and Robert Shrock | Gluon-Glueball Duality and Glueball Searches | 10 pages, latex | Phys.Rev.D80:054003,2009 | 10.1103/PhysRevD.80.054003 | TU-CU-SUNY preprint (YITP-SB-09-15) | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a notion of gluon-glueball duality analogous to quark-hadron
duality. We apply this idea to the radiative decay of heavy orthoquarkonium,
$Q\bar Q \to \gamma g g$, which has been used to search for glueballs. The
duality is first introduced in two simplified contexts: (i) a hypothetical
version of QCD without any light quarks and (ii) QCD in the large-$N_c$ limit.
We then discuss how an approximate form of this duality could hold in real QCD,
based on a hierarchy of time scales in the temporal evolution of the $gg$
subsystem in radiative orthoquarkonium decay. We apply this notion of
gluon-glueball duality to suggest a method that could be useful in experimental
searches for glueballs.
| [
{
"created": "Thu, 9 Jul 2009 14:44:51 GMT",
"version": "v1"
}
] | 2009-09-24 | [
[
"Nussinov",
"Shmuel",
""
],
[
"Shrock",
"Robert",
""
]
] | We discuss a notion of gluon-glueball duality analogous to quark-hadron duality. We apply this idea to the radiative decay of heavy orthoquarkonium, $Q\bar Q \to \gamma g g$, which has been used to search for glueballs. The duality is first introduced in two simplified contexts: (i) a hypothetical version of QCD without any light quarks and (ii) QCD in the large-$N_c$ limit. We then discuss how an approximate form of this duality could hold in real QCD, based on a hierarchy of time scales in the temporal evolution of the $gg$ subsystem in radiative orthoquarkonium decay. We apply this notion of gluon-glueball duality to suggest a method that could be useful in experimental searches for glueballs. |
hep-ph/0501005 | Alexander Andrianov | A. A. Andrianov (1,2), V. A. Andrianov (2)((1) INFN Bologna, (2)
St.Petersburg State University) | Quasilocal Quark Models as Effective Theory of Non-perturbative QCD | 5 pages, Talk at the International Symposium "MENU 2004",
29.August-4.September, Beijing,China | Int.J.Mod.Phys. A20 (2005) 1850-1854 | 10.1142/S0217751X05023475 | null | hep-ph nucl-th | null | We consider the Quasilocal Quark Model of NJL type (QNJLM) as an effective
theory of non-perturbative QCD including scalar (S), pseudoscalar (P), vector
(V) and axial-vector (A) four-fermion interaction with derivatives. In the
presence of a strong attraction in the scalar channel the chiral symmetry is
spontaneously broken and as a consequence the composite meson states are
generated in all channels. With the help of Operator Product Expansion the
appropriate set of Chiral Symmetry Restoration (CSR) Sum Rules in these
channels are imposed as matching conditions to QCD at intermediate energies.
The mass spectrum and some decay constants for ground and excited meson states
are calculated.
| [
{
"created": "Sun, 2 Jan 2005 13:45:24 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Andrianov",
"A. A.",
""
],
[
"Andrianov",
"V. A.",
""
]
] | We consider the Quasilocal Quark Model of NJL type (QNJLM) as an effective theory of non-perturbative QCD including scalar (S), pseudoscalar (P), vector (V) and axial-vector (A) four-fermion interaction with derivatives. In the presence of a strong attraction in the scalar channel the chiral symmetry is spontaneously broken and as a consequence the composite meson states are generated in all channels. With the help of Operator Product Expansion the appropriate set of Chiral Symmetry Restoration (CSR) Sum Rules in these channels are imposed as matching conditions to QCD at intermediate energies. The mass spectrum and some decay constants for ground and excited meson states are calculated. |
hep-ph/0402002 | Stephen D. H. Hsu | D.K. Hong and S.D.H. Hsu | The Fermion Sign Problem and High Density Effective Theory | Contribution to proceedings of KIAS-APCTP Symposium on Astro-Hadron
Physics, published by World Scientific. Based on talk by S. Hsu | null | 10.1142/9789812702524_0019 | null | hep-ph hep-lat hep-th nucl-th | null | We investigate the positivity of the Euclidean path integral measure for
low-energy modes in dense fermionic matter. We show that the sign problem
usually associated with fermions is absent if one considers only low-energy
degrees of freedom. We describe a method for simulating dense QCD on the
lattice and give a proof using rigorous inequalities that the color-flavor
locked (CFL) phase is the true vacuum of three flavor, massless QCD.
| [
{
"created": "Fri, 30 Jan 2004 22:54:46 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Hong",
"D. K.",
""
],
[
"Hsu",
"S. D. H.",
""
]
] | We investigate the positivity of the Euclidean path integral measure for low-energy modes in dense fermionic matter. We show that the sign problem usually associated with fermions is absent if one considers only low-energy degrees of freedom. We describe a method for simulating dense QCD on the lattice and give a proof using rigorous inequalities that the color-flavor locked (CFL) phase is the true vacuum of three flavor, massless QCD. |
1709.02571 | Fu-Sheng Yu | Fu-Sheng Yu | Weak-decay searches for $Qs\bar u\bar d$ tetraquarks | 5 pages, 4 figures | Eur.Phys.J.C 82, 641 (2022) | 10.1140/epjc/s10052-022-10567-8 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose to search for the open heavy-flavor exotic states with the quark
components of $Qs\bar u\bar d$ with $Q=b,c$ via their weak decays. If there
exist such exotic states below the $BK$ or $DK$ thresholds, they can only decay
weakly. The advantages include: (i) the experimental backgrounds from the
secondary decay vertex are much lower due to the long lifetimes, (ii) the
productions are large enough for only one heavy quark in such states, (iii) the
thresholds of $BK$ or $DK$ are about 260 MeV higher compared to the $B_s\pi$ or
$D_s\pi$ thresholds of the configurations of $Qu\bar s\bar d$ or $Qd\bar s\bar
u$ , with a higher possibility to exist such weakly-decay particles, and (iv)
if observed, their inner structures are easier understood since they can not be
induced by the kinematic effects.
| [
{
"created": "Fri, 8 Sep 2017 07:10:27 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Mar 2022 16:55:08 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Jul 2022 22:30:06 GMT",
"version": "v3"
}
] | 2022-07-28 | [
[
"Yu",
"Fu-Sheng",
""
]
] | We propose to search for the open heavy-flavor exotic states with the quark components of $Qs\bar u\bar d$ with $Q=b,c$ via their weak decays. If there exist such exotic states below the $BK$ or $DK$ thresholds, they can only decay weakly. The advantages include: (i) the experimental backgrounds from the secondary decay vertex are much lower due to the long lifetimes, (ii) the productions are large enough for only one heavy quark in such states, (iii) the thresholds of $BK$ or $DK$ are about 260 MeV higher compared to the $B_s\pi$ or $D_s\pi$ thresholds of the configurations of $Qu\bar s\bar d$ or $Qd\bar s\bar u$ , with a higher possibility to exist such weakly-decay particles, and (iv) if observed, their inner structures are easier understood since they can not be induced by the kinematic effects. |
hep-ph/0206294 | Cristian Villavicencio | M. Loewe and C. Villavicencio | Thermal Pions ns Isospin Chemical Potential Effects | 5 pages, 2 figures. To appear in the proceedings of the International
High-Energy Physics Conference on Quantum Chromodynamics QCD02, Montpellier,
2-9 July (2002) | null | 10.1016/S0920-5632(03)01864-4 | UCCHEP/ 20-02 | hep-ph | null | The density corrections, in terms of the isospin chemical potential $\mu_I$,
to the mass of the pions are investigated in the framework of the SU(2) low
energy effective chiral invariant lagrangian. As a function of temperature and
$\mu_I =0$, the mass remains quite stable, starting to grow for very high
values of $T$, confirming previous results. However, the dependence for a
non-vanishing chemical potential turns out to be much more dramatic. In
particular, there are interesting corrections to the mass when both effects
(temperature and chemical potential) are simultaneously present. At zero
temperature the $\pi ^{\pm}$ should condensate when $\mu_{I} = \mp m_{\pi}$.
This is not longer valid anymore at finite $T$. The mass of the $\pi_0$
acquires also a non trivial dependence on $\mu_I$ at finite $T$.
| [
{
"created": "Thu, 27 Jun 2002 22:21:44 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Sep 2002 18:57:44 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Loewe",
"M.",
""
],
[
"Villavicencio",
"C.",
""
]
] | The density corrections, in terms of the isospin chemical potential $\mu_I$, to the mass of the pions are investigated in the framework of the SU(2) low energy effective chiral invariant lagrangian. As a function of temperature and $\mu_I =0$, the mass remains quite stable, starting to grow for very high values of $T$, confirming previous results. However, the dependence for a non-vanishing chemical potential turns out to be much more dramatic. In particular, there are interesting corrections to the mass when both effects (temperature and chemical potential) are simultaneously present. At zero temperature the $\pi ^{\pm}$ should condensate when $\mu_{I} = \mp m_{\pi}$. This is not longer valid anymore at finite $T$. The mass of the $\pi_0$ acquires also a non trivial dependence on $\mu_I$ at finite $T$. |
1608.01650 | Masato Yamanaka | Yoshio Koide and Masato Yamanaka | Muon-Electron Conversion in a Family Gauge Boson Model | 14 pages, 3 figures | null | 10.1016/j.physletb.2016.09.004 | MISC-2016-07 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the $\mu$-$e$ conversion in muonic atoms via an exchange of family
gauge boson (FGB) $A_{2}^{\ 1}$ in a $U(3)$ FGB model. Within the class of FGB
model, we consider three types of family-number assignments for quarks. We
evaluate the $\mu$-$e$ conversion rate for various target nuclei, and find that
next generation $\mu$-$e$ conversion search experiments can cover entire energy
scale of the model for all of types of the quark family-number assignments. We
show that the conversion rate in the model is so sensitive to up- and
down-quark mixing matrices, $U^{u}$ and $U^{d}$, where the CKM matrix is given
by $V_\text{CKM} = U^{u\dagger} U^d$. Precise measurements of conversion rates
for various target nuclei can identify not only the types of quark
family-number assignments, but also each quark mixing matrix individually.
| [
{
"created": "Thu, 4 Aug 2016 19:35:29 GMT",
"version": "v1"
}
] | 2016-09-07 | [
[
"Koide",
"Yoshio",
""
],
[
"Yamanaka",
"Masato",
""
]
] | We study the $\mu$-$e$ conversion in muonic atoms via an exchange of family gauge boson (FGB) $A_{2}^{\ 1}$ in a $U(3)$ FGB model. Within the class of FGB model, we consider three types of family-number assignments for quarks. We evaluate the $\mu$-$e$ conversion rate for various target nuclei, and find that next generation $\mu$-$e$ conversion search experiments can cover entire energy scale of the model for all of types of the quark family-number assignments. We show that the conversion rate in the model is so sensitive to up- and down-quark mixing matrices, $U^{u}$ and $U^{d}$, where the CKM matrix is given by $V_\text{CKM} = U^{u\dagger} U^d$. Precise measurements of conversion rates for various target nuclei can identify not only the types of quark family-number assignments, but also each quark mixing matrix individually. |
1011.5790 | Sven-Olaf Moch | S. Alekhin and S. Moch | Heavy-quark deep-inelastic scattering with a running mass | 16 pages Latex, 8 figures | null | 10.1016/j.physletb.2011.04.026 | DESY 10-212 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the production of heavy quarks in deep-inelastic scattering within
perturbative QCD. As a novelty, we employ for the first time the running mass
definition in the MSbar scheme for deep-inelastic charm and bottom production.
We observe an improved stability of the perturbative expansion and a reduced
theoretical uncertainty due to variations of the renormalization and
factorization scales. As our best estimate we extract from a global fit to
fixed-target and HERA collider data for the charm-quark an MSbar mass of
m_c(m_c) = 1.01 +- 0.09 (exp) +- 0.03 (th) GeV.
| [
{
"created": "Fri, 26 Nov 2010 14:05:34 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Alekhin",
"S.",
""
],
[
"Moch",
"S.",
""
]
] | We study the production of heavy quarks in deep-inelastic scattering within perturbative QCD. As a novelty, we employ for the first time the running mass definition in the MSbar scheme for deep-inelastic charm and bottom production. We observe an improved stability of the perturbative expansion and a reduced theoretical uncertainty due to variations of the renormalization and factorization scales. As our best estimate we extract from a global fit to fixed-target and HERA collider data for the charm-quark an MSbar mass of m_c(m_c) = 1.01 +- 0.09 (exp) +- 0.03 (th) GeV. |
2107.13748 | Ning Li | Ning Li, Zhi-Feng Sun, Xiang Liu, and Shi-Lin Zhu | Perfect $DD^*$ molecular prediction matching the $T_{cc}$ observation at
LHCb | 2 pages, 2 figures | Chin. Phys. Lett. 38, 092001 (2021) | 10.1088/0256-307X/38/9/092001 | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In 2012, we investigated the possible molecular states composed of two
charmed mesons [Phys.Rev. D 88, 114008 (2013), arXiv:1211.5007 [hep-ph](2012)].
The $D^*D$ system with the quantum numbers of $I(J^P)=0(1^+)$ was found to be a
good candidate of the loosely bound molecular state. This state is very close
to the $D^*D$ threshold with a binding energy around 0.47 MeV. This prediction
was confirmed by the new LHCb observation of $T_{cc}^+$ [see Franz Muheim's
talk at the European Physical Society conference on high energy physics 2021].
| [
{
"created": "Thu, 29 Jul 2021 05:06:27 GMT",
"version": "v1"
},
{
"created": "Sun, 1 Aug 2021 03:08:33 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Aug 2021 08:09:13 GMT",
"version": "v3"
},
{
"created": "Sun, 15 Aug 2021 03:07:05 GMT",
"version": "v4"
},
{
"cre... | 2021-09-07 | [
[
"Li",
"Ning",
""
],
[
"Sun",
"Zhi-Feng",
""
],
[
"Liu",
"Xiang",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] | In 2012, we investigated the possible molecular states composed of two charmed mesons [Phys.Rev. D 88, 114008 (2013), arXiv:1211.5007 [hep-ph](2012)]. The $D^*D$ system with the quantum numbers of $I(J^P)=0(1^+)$ was found to be a good candidate of the loosely bound molecular state. This state is very close to the $D^*D$ threshold with a binding energy around 0.47 MeV. This prediction was confirmed by the new LHCb observation of $T_{cc}^+$ [see Franz Muheim's talk at the European Physical Society conference on high energy physics 2021]. |
1308.1368 | Danny Marfatia | Jiajun Liao, Danny Marfatia, Kerry Whisnant | Dual models of the neutrino mass spectrum | 12 pages, 1 eps figure. Version to appear in PRD | Phys. Rev. D 89, 013009 (2014) | 10.1103/PhysRevD.89.013009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that any model with a homogeneous relationship among elements of the
neutrino mass matrix with one mass hierarchy yields predictions for the
oscillation parameters and Majorana phases similar to those given by a model
with the same homogeneous relationship among cofactors of the neutrino mass
matrix with the opposite mass hierarchy, except when the lightest mass is of
order 20 meV or less.
| [
{
"created": "Tue, 6 Aug 2013 18:27:10 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Jan 2014 18:29:57 GMT",
"version": "v2"
}
] | 2014-01-29 | [
[
"Liao",
"Jiajun",
""
],
[
"Marfatia",
"Danny",
""
],
[
"Whisnant",
"Kerry",
""
]
] | We show that any model with a homogeneous relationship among elements of the neutrino mass matrix with one mass hierarchy yields predictions for the oscillation parameters and Majorana phases similar to those given by a model with the same homogeneous relationship among cofactors of the neutrino mass matrix with the opposite mass hierarchy, except when the lightest mass is of order 20 meV or less. |
hep-ph/0406124 | Khamidbi Beshtoev Mukhamedovich | Kh. M. Beshtoev | Schemes of Neutrino Mixings (Oscillations) and Their Mixing Matrices | LATEX, 13 pages, no figures and tables | null | null | JINR Communication E2-2004-58, Dubna, 2004 | hep-ph | null | Three schemes of neutrino mixings (oscillations) together with their mixing
matrices (analogous to Kabibbo-Kobayashi-Maskawa matrices) are considered. In
these schemes neutrino transitions are virtual if neutrino masses are
different. Two of them belong to the so called mass mixing schemes (mixing
parameters are expressed by elements of mass matrices) and the third scheme
belongs to the charge mixing scheme (mixing parameters are expressed through
charges). In the first scheme system of 6 equations for determination of the
all elements of the mass matrix (neutrino masses and transition widths) by
using experimental data are obtained. In the second and third ones the neutrino
mixing angles are equal or close to maximal angles ($\pi/4$). It is obvious
that the experiment must give an answer to the following question: Which of
these schemes is realized indeed?
| [
{
"created": "Thu, 10 Jun 2004 15:16:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Beshtoev",
"Kh. M.",
""
]
] | Three schemes of neutrino mixings (oscillations) together with their mixing matrices (analogous to Kabibbo-Kobayashi-Maskawa matrices) are considered. In these schemes neutrino transitions are virtual if neutrino masses are different. Two of them belong to the so called mass mixing schemes (mixing parameters are expressed by elements of mass matrices) and the third scheme belongs to the charge mixing scheme (mixing parameters are expressed through charges). In the first scheme system of 6 equations for determination of the all elements of the mass matrix (neutrino masses and transition widths) by using experimental data are obtained. In the second and third ones the neutrino mixing angles are equal or close to maximal angles ($\pi/4$). It is obvious that the experiment must give an answer to the following question: Which of these schemes is realized indeed? |
1604.01008 | Gabor Cynolter | G.Cynolter, J . Kov\'acs and E.Lendvai | Diphoton excess and VV-scattering | 10 pages, 2 Latex figures, v2 typos corrected, references added,
published version | null | 10.1142/S0217732316501339 | ITP-Budapest 668 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider minimal effective interactions of the 750 GeV mass resonance
observed recently by ATLAS and CMS. Assuming a new scalar and gauge invariant
effective interactions leads to non-trivial two particle scattering amplitudes
with asymptotic gauge boson states. The longitudinally polarized $W\pm$ and $Z$
bosons interacting via dimension-five effective operators provide stringent
constraints on the validity of the effective model. The large width found by
ATLAS implying a bound of approximately 500 GeV already below the resonance,
turns this scenario unlikely. For production mainly in gluon fusion we get an
upper bound of $\sim 1.3$ TeV and strong limits on the masses of the underlying
vector-like fermions are given.
| [
{
"created": "Mon, 4 Apr 2016 19:57:58 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jul 2016 13:09:45 GMT",
"version": "v2"
}
] | 2016-07-12 | [
[
"Cynolter",
"G.",
""
],
[
"Kovács",
"J .",
""
],
[
"Lendvai",
"E.",
""
]
] | We consider minimal effective interactions of the 750 GeV mass resonance observed recently by ATLAS and CMS. Assuming a new scalar and gauge invariant effective interactions leads to non-trivial two particle scattering amplitudes with asymptotic gauge boson states. The longitudinally polarized $W\pm$ and $Z$ bosons interacting via dimension-five effective operators provide stringent constraints on the validity of the effective model. The large width found by ATLAS implying a bound of approximately 500 GeV already below the resonance, turns this scenario unlikely. For production mainly in gluon fusion we get an upper bound of $\sim 1.3$ TeV and strong limits on the masses of the underlying vector-like fermions are given. |
hep-ph/0108047 | Butkevich | L. B. Bezrukov and A. V. Butkevich | Fast simulation of the Cherenkov light from showers | 15 pages, 6 figures, submitted to Nucl. Instrum. and Methods | null | null | null | hep-ph | null | A method for fast simulation of the Cherenkov light generated by
electromagnetic showers is described. The parametrization for the longitudinal
profile is used and fluctuations and correlations of the parameters are taken
into account in a consistent way. Our method dramatically reduces the CPU time
and its results are in a rather good agreement with a full Monte Carlo
simulation.
| [
{
"created": "Sun, 5 Aug 2001 06:14:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bezrukov",
"L. B.",
""
],
[
"Butkevich",
"A. V.",
""
]
] | A method for fast simulation of the Cherenkov light generated by electromagnetic showers is described. The parametrization for the longitudinal profile is used and fluctuations and correlations of the parameters are taken into account in a consistent way. Our method dramatically reduces the CPU time and its results are in a rather good agreement with a full Monte Carlo simulation. |
1005.4183 | Harry Lipkin J | Harry J. Lipkin | Why do neutrinos with different masses interfere and oscillate? Why are
states with different masses but same energy coherent? Overcoming barrier
between particle & condensed matter physics | 16 pages, no figures, new title and abstract clarification of
previous version | null | null | null | hep-ph physics.ins-det quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutrino oscillations occur only if it is impossible to determine $\nu$ mass
by using conservation laws on measurements of nucleon-lepton system absorbing
$\nu$. No oscillations if $\nu$ detector is mass spectrometer. Beam is split
into components with different masses entering different counters. For each
event only one counter will click and determine $\nu$ mass. Condensed matter
physics needed to describe the $\nu$ detector, show it is not a mass
spectrometer and identify which properties of the incident $\nu$ are
unobservable. Relativistic quantum field theory can only describe $\nu$ wave
function entering detector but not large uncertain momentum transfers to
detector nor associated energy-momentum asymmetry. Absorption of incident
$\nu$'s with different momenta but same energy leaves no trace of initial $\nu$
momentum difference in finite-size $\nu$ detector with effectively infinite
mass at rest in laboratory. Undetectable recoil-free momentum is transferred to
the detector with negligible energy transfer. The Debye-Waller factor common in
X-ray diffraction by crystals gives probability that absorbing $\nu$'s with
different momenta produce same nucleon-charged-lepton final state. Oscillations
in time described in textbooks as interference between $\nu$ states with
different energies not observable in realistic experiments. Different energy
$\nu$'s not coherent because energy can be determined by measurements on
initial and final states. Experiments detecting $\nu$ produced by $\pi to \mu
\nu$ decay observe no electrons even though $\nu$ mass eigenstates produce
electrons. Electron amplitude canceled by interference between amplitudes from
different $\nu$ mass eigenstates with same energy and different momenta
entering massive detector.
| [
{
"created": "Sun, 23 May 2010 09:31:28 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Jul 2011 16:20:19 GMT",
"version": "v2"
},
{
"created": "Sun, 7 Aug 2011 18:42:35 GMT",
"version": "v3"
},
{
"created": "Sun, 4 Dec 2011 10:34:24 GMT",
"version": "v4"
},
{
"cre... | 2012-07-25 | [
[
"Lipkin",
"Harry J.",
""
]
] | Neutrino oscillations occur only if it is impossible to determine $\nu$ mass by using conservation laws on measurements of nucleon-lepton system absorbing $\nu$. No oscillations if $\nu$ detector is mass spectrometer. Beam is split into components with different masses entering different counters. For each event only one counter will click and determine $\nu$ mass. Condensed matter physics needed to describe the $\nu$ detector, show it is not a mass spectrometer and identify which properties of the incident $\nu$ are unobservable. Relativistic quantum field theory can only describe $\nu$ wave function entering detector but not large uncertain momentum transfers to detector nor associated energy-momentum asymmetry. Absorption of incident $\nu$'s with different momenta but same energy leaves no trace of initial $\nu$ momentum difference in finite-size $\nu$ detector with effectively infinite mass at rest in laboratory. Undetectable recoil-free momentum is transferred to the detector with negligible energy transfer. The Debye-Waller factor common in X-ray diffraction by crystals gives probability that absorbing $\nu$'s with different momenta produce same nucleon-charged-lepton final state. Oscillations in time described in textbooks as interference between $\nu$ states with different energies not observable in realistic experiments. Different energy $\nu$'s not coherent because energy can be determined by measurements on initial and final states. Experiments detecting $\nu$ produced by $\pi to \mu \nu$ decay observe no electrons even though $\nu$ mass eigenstates produce electrons. Electron amplitude canceled by interference between amplitudes from different $\nu$ mass eigenstates with same energy and different momenta entering massive detector. |
0904.2124 | Rohit Dhir | Rohit Dhir and R.C. Verma | Magnetic Moments of $J^P=3/2^+$ Heavy Baryons Using Effective Mass and
Screened Charge Scheme | 19 pages, Accepted for publication in EPJ-A | Eur.Phys.J.A42:243-249,2009 | 10.1140/epja/i2009-10872-8 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Magnetic moments of heavy charmed baryons with $J^P=3/2^+$ are predicted
employing the concept of effective quark mass and screened charge of quark. We
also extend our scheme to predict the $3/2^+ --> 1/2^+$ transition magnetic
moments. A comparison of our results with the predictions obtained in recent
models is presented.
| [
{
"created": "Tue, 14 Apr 2009 13:57:31 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Sep 2009 05:53:33 GMT",
"version": "v2"
}
] | 2009-11-19 | [
[
"Dhir",
"Rohit",
""
],
[
"Verma",
"R. C.",
""
]
] | Magnetic moments of heavy charmed baryons with $J^P=3/2^+$ are predicted employing the concept of effective quark mass and screened charge of quark. We also extend our scheme to predict the $3/2^+ --> 1/2^+$ transition magnetic moments. A comparison of our results with the predictions obtained in recent models is presented. |
1010.3974 | Hua-Xing Chen | Hua-Xing Chen, Zi-Xing Cai, Peng-Zhi Huang and Shi-Lin Zhu | The Decay Properties of the 1^{-+} Hybrid State | one reference corrected | Phys.Rev.D83:014006,2011 | 10.1103/PhysRevD.83.014006 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the framework of the QCD sum rules, we consider the three-point
correlation function, work at the limit q^2 -> 0 and m_\pi -> 0, and pick out
the singular term ~ {1\over q^2} to extract the pionic coupling constants of
the 1^{-+} hybrid meson. Then we calculate the decay widths of different modes.
The decay width of the S-wave modes b_1 \pi, f_1\pi increases quickly as the
hybrid meson mass and decay momentum increase. But for the low mass hybrid
meson around 1.6 GeV, the P-wave decay mode \rho \pi is very important and its
width is around 180 MeV, while the widths of \eta \pi and \eta^\prime \pi are
strongly suppressed. We suggest the experimental search of \pi_1(1600) through
the decay chains at BESIII: e^+e^- -> J/\psi(\psi') -> \pi_1 +\gamma or e^+e^-
-> J/\psi(\psi') -> \pi_1 +\rho where the \pi_1 state can be reconstructed
through the decay modes \pi_1 -> \rho\pi -> \pi^+\pi^-\pi^0 or \pi_1 ->
f_1(1285)\pi^0. It is also interesting to look for \pi_1 using the available
BELLE/BABAR data through the process e^+e^- -> \gamma^\ast -> \rho\pi_1,
b_1\pi_1, \gamma \pi_1 etc.
| [
{
"created": "Tue, 19 Oct 2010 16:45:47 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Dec 2010 03:32:51 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Jan 2011 10:51:06 GMT",
"version": "v3"
},
{
"created": "Fri, 29 Apr 2011 15:25:43 GMT",
"version": "v4"
}
] | 2015-03-17 | [
[
"Chen",
"Hua-Xing",
""
],
[
"Cai",
"Zi-Xing",
""
],
[
"Huang",
"Peng-Zhi",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] | Within the framework of the QCD sum rules, we consider the three-point correlation function, work at the limit q^2 -> 0 and m_\pi -> 0, and pick out the singular term ~ {1\over q^2} to extract the pionic coupling constants of the 1^{-+} hybrid meson. Then we calculate the decay widths of different modes. The decay width of the S-wave modes b_1 \pi, f_1\pi increases quickly as the hybrid meson mass and decay momentum increase. But for the low mass hybrid meson around 1.6 GeV, the P-wave decay mode \rho \pi is very important and its width is around 180 MeV, while the widths of \eta \pi and \eta^\prime \pi are strongly suppressed. We suggest the experimental search of \pi_1(1600) through the decay chains at BESIII: e^+e^- -> J/\psi(\psi') -> \pi_1 +\gamma or e^+e^- -> J/\psi(\psi') -> \pi_1 +\rho where the \pi_1 state can be reconstructed through the decay modes \pi_1 -> \rho\pi -> \pi^+\pi^-\pi^0 or \pi_1 -> f_1(1285)\pi^0. It is also interesting to look for \pi_1 using the available BELLE/BABAR data through the process e^+e^- -> \gamma^\ast -> \rho\pi_1, b_1\pi_1, \gamma \pi_1 etc. |
hep-ph/9806301 | Borzumati Francesca | F.M. Borzumati (Zurich Univ.), A. Djouadi (Montpellier Univ.) | Lower Bounds on Charged Higgs Bosons from LEP and the TEVATRON | 9 pages, 4 figures | Phys.Lett.B549:170-176,2002 | 10.1016/S0370-2693(02)02889-7 | ZU-TH 5/98, PM-98/1 | hep-ph | null | We point out that charged Higgs bosons can decay into final states different
than $\tau^+ \nu_\tau$ and $c \bar{s}$, even when they are light enough to be
produced at LEPII or at the Tevatron, through top-quark decays. These
additional decay modes are overlooked in ongoing searches even though they
alter the existing lower bounds on the mass of charged Higgs bosons that are
present in supersymmetric and two Higgs doublets models.
| [
{
"created": "Mon, 8 Jun 1998 11:25:19 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Oct 2002 03:18:50 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Borzumati",
"F. M.",
"",
"Zurich Univ."
],
[
"Djouadi",
"A.",
"",
"Montpellier Univ."
]
] | We point out that charged Higgs bosons can decay into final states different than $\tau^+ \nu_\tau$ and $c \bar{s}$, even when they are light enough to be produced at LEPII or at the Tevatron, through top-quark decays. These additional decay modes are overlooked in ongoing searches even though they alter the existing lower bounds on the mass of charged Higgs bosons that are present in supersymmetric and two Higgs doublets models. |
1403.2053 | Kingman Cheung | Jung Chang, Kingman Cheung, Jae Sik Lee, and Chih-Ting Lu | Probing the Top-Yukawa Coupling in Associated Higgs production with a
Single Top Quark | 28 pages, 13 figures; a comment about NLO correction is added,
references added; match the published version | null | 10.1007/JHEP05(2014)062 | CNU-HEP-14-01 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Associated production of the Higgs boson with a single top quark proceeds
through Feynman diagrams, which are either proportional to the hWW, top-Yukawa,
or the bottom-Yukawa couplings. It was shown in literature that the
interference between the top-Yukawa and the gauge-Higgs diagrams can be
significant, and thus the measurement of the cross sections can help pin down
the sign and the size of the top-Yukawa coupling. Here we perform a detailed
study with full detector simulations of such a possibility at the LHC-14 within
the current allowed range of hWW and top-Yukawa couplings, using h-> b b-bar,
\gamma\gamma, \tau+ \tau-, ZZ* -> 4 l modes. We found that the LHC-14 has the
potential to distinguish the size and the sign of the top-Yukawa coupling.
Among the channels the h-> b b-bar mode mode provides the best chance to probe
the signal, followed by the h -> \gamma\gamma\ mode, which has the advantage of
a narrow reconstructed mass peak. We also pointed out that the spatial
separation among the final-state particles has the potential in differentiating
among various values of the top-Yukawa coupling.
| [
{
"created": "Sun, 9 Mar 2014 12:29:22 GMT",
"version": "v1"
},
{
"created": "Thu, 29 May 2014 07:07:04 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Chang",
"Jung",
""
],
[
"Cheung",
"Kingman",
""
],
[
"Lee",
"Jae Sik",
""
],
[
"Lu",
"Chih-Ting",
""
]
] | Associated production of the Higgs boson with a single top quark proceeds through Feynman diagrams, which are either proportional to the hWW, top-Yukawa, or the bottom-Yukawa couplings. It was shown in literature that the interference between the top-Yukawa and the gauge-Higgs diagrams can be significant, and thus the measurement of the cross sections can help pin down the sign and the size of the top-Yukawa coupling. Here we perform a detailed study with full detector simulations of such a possibility at the LHC-14 within the current allowed range of hWW and top-Yukawa couplings, using h-> b b-bar, \gamma\gamma, \tau+ \tau-, ZZ* -> 4 l modes. We found that the LHC-14 has the potential to distinguish the size and the sign of the top-Yukawa coupling. Among the channels the h-> b b-bar mode mode provides the best chance to probe the signal, followed by the h -> \gamma\gamma\ mode, which has the advantage of a narrow reconstructed mass peak. We also pointed out that the spatial separation among the final-state particles has the potential in differentiating among various values of the top-Yukawa coupling. |
0707.2855 | Andrei Kataev | A.L.Kataev (INR, Moscow) | Non-planar structure of analytical QCD predictions for the Gottfried sum
rule | 12 pages, based on the talk at the Parralel Session of XI
International Workshop on Advanced Computing and Analysis Techniques in
Physics Research (ACAT07), April 23-27, 2007, Amsterdam; submitted to the
Proceedings | PoSACAT2007:072,2007 | null | null | hep-ph hep-ex hep-th | null | It is stressed that within large N_c-expansion {\bf analytical calculations}
of the $(\alpha_s/\pi)^2$ QCD contributions to the valence part of the
Gottfried sum rule for F_2 structure function of charged leptons-nucleon
deep-inelastic scattering reveals the existence of the $O(1/N_c^2)$ {\bf
non-planar} corrections only and the disappearance of the {\bf planar} O(N_c^0)
perturbative terms. The relation between Gottfried and Adler sum rule for
neutino-nucleon DIS is established and the proposal that the differebce between
corresponding QCD corrections to higher non-singlet moments in charged-lepton
and neutrino DIS are {\bf suppressed by 1/N_c^2} is made. The possible
consequence of the cancellation of {\bf perturbative planar} graphs in the
considered perturbative series, namely the existence of light-quark flavour
asymmetry $\bar{u}(x)<\bar{d}(x)$, is mentioned. The effect of the similar
origin, i.e. the relation of {\bf ``light-by-light-type''-type structure} in
DIS characteristics at the $\alpha_s^3$-level to the generation of light
quark-antiquark asymmetry, is also commented.
| [
{
"created": "Thu, 19 Jul 2007 09:16:35 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kataev",
"A. L.",
"",
"INR, Moscow"
]
] | It is stressed that within large N_c-expansion {\bf analytical calculations} of the $(\alpha_s/\pi)^2$ QCD contributions to the valence part of the Gottfried sum rule for F_2 structure function of charged leptons-nucleon deep-inelastic scattering reveals the existence of the $O(1/N_c^2)$ {\bf non-planar} corrections only and the disappearance of the {\bf planar} O(N_c^0) perturbative terms. The relation between Gottfried and Adler sum rule for neutino-nucleon DIS is established and the proposal that the differebce between corresponding QCD corrections to higher non-singlet moments in charged-lepton and neutrino DIS are {\bf suppressed by 1/N_c^2} is made. The possible consequence of the cancellation of {\bf perturbative planar} graphs in the considered perturbative series, namely the existence of light-quark flavour asymmetry $\bar{u}(x)<\bar{d}(x)$, is mentioned. The effect of the similar origin, i.e. the relation of {\bf ``light-by-light-type''-type structure} in DIS characteristics at the $\alpha_s^3$-level to the generation of light quark-antiquark asymmetry, is also commented. |
1308.3116 | Igor O. Cherednikov | I.O. Cherednikov, T. Mertens, P. Taels, F.F. Van der Veken | Evolution of transverse-distance dependent parton densities at
large-$x_B$ and geometry of the loop space | 9 pages, 1 eps figure; needs ws-ijmpcs.cls (supplied). Invited talk
presented at the QCD Evolution Workshop, May 6 -10, 2013, Thomas Jefferson
National Accelerator Facility, Newport News (VA), USA | Int. J. Mod. Phys. Conf. Ser. 25 (2014) 1460006(1-9) | 10.1142/S2010194514600064 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss possible applications of the equations of motion in the
generalized Wilson loop space to the phenomenology of the three-dimensional
parton distribution functions in the large-$x_B$ approximation. This regime is
relevant for future experimental programs to be launched at the (approved)
Jefferson Lab 12 GeV upgrade and the (planned) Electron-Ion Collider. We show
that the geometrical evolution of the Wilson loops corresponds to the combined
rapidity and renormalization-group equation of the transverse-distance
dependent parton densities in the large-$x_B$ factorization scheme.
| [
{
"created": "Wed, 14 Aug 2013 13:24:15 GMT",
"version": "v1"
}
] | 2014-01-09 | [
[
"Cherednikov",
"I. O.",
""
],
[
"Mertens",
"T.",
""
],
[
"Taels",
"P.",
""
],
[
"Van der Veken",
"F. F.",
""
]
] | We discuss possible applications of the equations of motion in the generalized Wilson loop space to the phenomenology of the three-dimensional parton distribution functions in the large-$x_B$ approximation. This regime is relevant for future experimental programs to be launched at the (approved) Jefferson Lab 12 GeV upgrade and the (planned) Electron-Ion Collider. We show that the geometrical evolution of the Wilson loops corresponds to the combined rapidity and renormalization-group equation of the transverse-distance dependent parton densities in the large-$x_B$ factorization scheme. |
1509.08975 | Meng-Ru Wu | Meng-Ru Wu, Huaiyu Duan, Yong-Zhong Qian | Physics of neutrino flavor transformation through matter-neutrino
resonances | 7 pages, 4 figures | Physics Letters B (2016), pp. 89-94 | 10.1016/j.physletb.2015.11.027 | null | hep-ph astro-ph.HE nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In astrophysical environments such as core-collapse supernovae and neutron
star-neutron star or neutron star-black hole mergers where dense neutrino media
are present, matter-neutrino resonances (MNRs) can occur when the neutrino
propagation potentials due to neutrino-electron and neutrino-neutrino forward
scattering nearly cancel each other. We show that neutrino flavor
transformation through MNRs can be explained by multiple adiabatic solutions
similar to the Mikheyev-Smirnov-Wolfenstein mechanism. We find that for the
normal neutrino mass hierarchy, neutrino flavor evolution through MNRs can be
sensitive to the shape of neutrino spectra and the adiabaticity of the system,
but such sensitivity is absent for the inverted hierarchy.
| [
{
"created": "Tue, 29 Sep 2015 23:21:39 GMT",
"version": "v1"
}
] | 2015-11-24 | [
[
"Wu",
"Meng-Ru",
""
],
[
"Duan",
"Huaiyu",
""
],
[
"Qian",
"Yong-Zhong",
""
]
] | In astrophysical environments such as core-collapse supernovae and neutron star-neutron star or neutron star-black hole mergers where dense neutrino media are present, matter-neutrino resonances (MNRs) can occur when the neutrino propagation potentials due to neutrino-electron and neutrino-neutrino forward scattering nearly cancel each other. We show that neutrino flavor transformation through MNRs can be explained by multiple adiabatic solutions similar to the Mikheyev-Smirnov-Wolfenstein mechanism. We find that for the normal neutrino mass hierarchy, neutrino flavor evolution through MNRs can be sensitive to the shape of neutrino spectra and the adiabaticity of the system, but such sensitivity is absent for the inverted hierarchy. |
1605.00997 | Chandan Mondal | Dipankar Chakrabarti and Chandan Mondal | Nucleon to $\Delta$ transition form factors and empirical transverse
charge densities | 9 pages, 5 figures; minor text modified, version to appear in Eur.
Phys. J. A | Eur. Phys. J. A 52, 285 (2016) | 10.1140/epja/i2016-16285-8 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the nucleon to $\Delta$ transition form factors in a soft-wall
AdS/QCD model and a light-front quark-diquark model inspired by AdS/QCD. From
the transition form factors we evaluate the transition charge densities which
influences the nucleon to $\Delta$ excitation. Here we consider both the
unpolarized and the transversely polarized cases. The AdS/QCD predictions are
compared with available experimental data and with the results of the global
parameterization, MAID2007.
| [
{
"created": "Tue, 3 May 2016 17:47:55 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Sep 2016 18:00:50 GMT",
"version": "v2"
}
] | 2016-09-15 | [
[
"Chakrabarti",
"Dipankar",
""
],
[
"Mondal",
"Chandan",
""
]
] | We investigate the nucleon to $\Delta$ transition form factors in a soft-wall AdS/QCD model and a light-front quark-diquark model inspired by AdS/QCD. From the transition form factors we evaluate the transition charge densities which influences the nucleon to $\Delta$ excitation. Here we consider both the unpolarized and the transversely polarized cases. The AdS/QCD predictions are compared with available experimental data and with the results of the global parameterization, MAID2007. |
hep-ph/9306309 | Uri Sarid | Lawrence J. Hall, Riccardo Rattazzi and Uri Sarid | The Top Quark Mass in Supersymmetric SO(10) Unification | 37 pages incl. 3 figures appended at bottom of file, RevTeX,
[Revised, corrected & expanded] LBL-33997 | Phys. Rev. D 50, 7048 (1994) | 10.1103/PhysRevD.50.7048 | null | hep-ph | null | The successful prediction of $\sin^2\theta_W$ suggests that the effective
theory beneath the GUT scale is the two-Higgs MSSM. If we further assume that
the unified gauge group contains SO(10), that the two light Higgs doublets lie
mostly in a single irreducible SO(10) representation, and that the $t$, $b$ and
$\tau$ masses originate in renormalizable Yukawa interactions of the form $16_3
O 16_3$, then also the top quark mass can be predicted in terms of the MSSM
parameters. To compute $m_t$ we present a precise analytic approximation to the
solution of the 2-loop renormalization group equations, and study
supersymmetric and GUT threshold corrections and the input value of the $b$
quark mass. The large ratio of top to bottom quark masses derives from a large
ratio, $\tan\beta$, of Higgs vacuum expectation values. We point out that when
$\tan\beta$ is large, so are certain corrections to the $b$ quark mass
prediction, unless a particular hierarchy exists in the parameters of the
model. With such a hierarchy, which may result from approximate symmetries, the
top mass prediction depends only weakly on the spectrum. Our results may be
applied to any supersymmetric SO(10)-like model as long as $\lambda_t\simeq
\lambda_b\simeq\lambda_\tau$ at the GUT scale and there are no intermediate
mass scales in the desert.
| [
{
"created": "Thu, 24 Jun 1993 01:31:58 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Apr 1994 05:22:15 GMT",
"version": "v2"
}
] | 2013-11-13 | [
[
"Hall",
"Lawrence J.",
""
],
[
"Rattazzi",
"Riccardo",
""
],
[
"Sarid",
"Uri",
""
]
] | The successful prediction of $\sin^2\theta_W$ suggests that the effective theory beneath the GUT scale is the two-Higgs MSSM. If we further assume that the unified gauge group contains SO(10), that the two light Higgs doublets lie mostly in a single irreducible SO(10) representation, and that the $t$, $b$ and $\tau$ masses originate in renormalizable Yukawa interactions of the form $16_3 O 16_3$, then also the top quark mass can be predicted in terms of the MSSM parameters. To compute $m_t$ we present a precise analytic approximation to the solution of the 2-loop renormalization group equations, and study supersymmetric and GUT threshold corrections and the input value of the $b$ quark mass. The large ratio of top to bottom quark masses derives from a large ratio, $\tan\beta$, of Higgs vacuum expectation values. We point out that when $\tan\beta$ is large, so are certain corrections to the $b$ quark mass prediction, unless a particular hierarchy exists in the parameters of the model. With such a hierarchy, which may result from approximate symmetries, the top mass prediction depends only weakly on the spectrum. Our results may be applied to any supersymmetric SO(10)-like model as long as $\lambda_t\simeq \lambda_b\simeq\lambda_\tau$ at the GUT scale and there are no intermediate mass scales in the desert. |
hep-ph/0212316 | Dmitri Kharzeev | D. Kharzeev, E. Levin and M. Nardi | QCD Saturation and Deuteron-Nucleus Collisions | 16 pages, 5 figures; added Erratum with a discussion of centrality
selection procedure and comparison to the published experimental results | Nucl.Phys.A730:448-459,2004; Erratum-ibid.A743:329-331,2004 | 10.1016/j.nuclphysa.2004.06.022 | BNL-NT-02/30 | hep-ph nucl-ex nucl-th | null | We make quantitative predictions for the rapidity and centrality dependencies
of hadron multiplicities in dA collisions at RHIC basing on the ideas of parton
saturation in the Color Glass Condensate.
| [
{
"created": "Fri, 20 Dec 2002 16:26:41 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jan 2003 15:32:29 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Aug 2003 20:06:37 GMT",
"version": "v3"
},
{
"created": "Mon, 8 Mar 2004 20:32:00 GMT",
"version": "v4"
}
] | 2010-11-30 | [
[
"Kharzeev",
"D.",
""
],
[
"Levin",
"E.",
""
],
[
"Nardi",
"M.",
""
]
] | We make quantitative predictions for the rapidity and centrality dependencies of hadron multiplicities in dA collisions at RHIC basing on the ideas of parton saturation in the Color Glass Condensate. |
2311.05683 | Mario Fern\'andez Navarro | Mario Fern\'andez Navarro, Stephen F. King and Avelino Vicente | Tri-unification: a separate $SU(5)$ for each fermion family | 19 pages + Appendix, 7 figures. v4: minor changes to scalar reps,
conclusions unchanged | JHEP 05 (2024) 130 | 10.1007/JHEP05(2024)130 | IFIC/23-48 | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper we discuss $SU(5)^{3}$ with cyclic symmetry as a possible grand
unified theory (GUT). The basic idea of such a tri-unification is that there is
a separate $SU(5)$ for each fermion family, with the light Higgs doublet(s)
arising from the third family $SU(5)$, providing a basis for charged fermion
mass hierarchies. $SU(5)^{3}$ tri-unification reconciles the idea of gauge
non-universality with the idea of gauge coupling unification, opening the
possibility to build consistent non-universal descriptions of Nature that are
valid all the way up to the scale of grand unification. As a concrete example,
we propose a grand unified embedding of the tri-hypercharge model $U(1)_Y^3$
based on an $SU(5)^{3}$ framework with cyclic symmetry. We discuss a minimal
tri-hypercharge example which can account for all the quark and lepton
(including neutrino) masses and mixing parameters. We show that it is possible
to unify the many gauge couplings into a single gauge coupling associated with
the cyclic $SU(5)^{3}$ gauge group, by assuming minimal multiplet splitting,
together with a set of relatively light colour octet scalars. We also study
proton decay in this example, and present the predictions for the proton
lifetime in the dominant $e^+\pi^0$ channel.
| [
{
"created": "Thu, 9 Nov 2023 19:00:02 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Nov 2023 11:14:02 GMT",
"version": "v2"
},
{
"created": "Mon, 13 May 2024 13:25:04 GMT",
"version": "v3"
},
{
"created": "Wed, 26 Jun 2024 15:23:02 GMT",
"version": "v4"
}
] | 2024-06-27 | [
[
"Navarro",
"Mario Fernández",
""
],
[
"King",
"Stephen F.",
""
],
[
"Vicente",
"Avelino",
""
]
] | In this paper we discuss $SU(5)^{3}$ with cyclic symmetry as a possible grand unified theory (GUT). The basic idea of such a tri-unification is that there is a separate $SU(5)$ for each fermion family, with the light Higgs doublet(s) arising from the third family $SU(5)$, providing a basis for charged fermion mass hierarchies. $SU(5)^{3}$ tri-unification reconciles the idea of gauge non-universality with the idea of gauge coupling unification, opening the possibility to build consistent non-universal descriptions of Nature that are valid all the way up to the scale of grand unification. As a concrete example, we propose a grand unified embedding of the tri-hypercharge model $U(1)_Y^3$ based on an $SU(5)^{3}$ framework with cyclic symmetry. We discuss a minimal tri-hypercharge example which can account for all the quark and lepton (including neutrino) masses and mixing parameters. We show that it is possible to unify the many gauge couplings into a single gauge coupling associated with the cyclic $SU(5)^{3}$ gauge group, by assuming minimal multiplet splitting, together with a set of relatively light colour octet scalars. We also study proton decay in this example, and present the predictions for the proton lifetime in the dominant $e^+\pi^0$ channel. |
1312.3097 | Kyohei Mukaida | Keisuke Harigaya and Kyohei Mukaida | Thermalization after/during Reheating | 20 pages, 4 figures; v2: discussion on abelian gauge theory is
modified; v3: published version | JHEP 1405 (2014) 006 | 10.1007/JHEP05(2014)006 | IPMU 13-0233, UT-13-43 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If reheating of the Universe takes place via Planck-suppressed decay, it
seems that the thermalization of produced particles might be delayed, since
they have large energy/small number densities and number violating large angle
scatterings which decrease the momentum of particles by large amount are
inefficient correspondingly. In this paper, we study the thermalization of such
"under occupied" decay products in detail, following recent developments in
understanding the thermalization of non-abelian plasma. Contrary to the above
naive expectation, it is shown that in most cases thermalization after/during
reheating occurs instantaneously by properly taking account of scatterings with
small angles and of particles with small momenta. In particular, the condition
for instantaneous thermalization before the completion of reheating is found to
be $\alpha^{8/5} \gg (m_\phi / M_{\rm pl}) (M_{\rm pl}^2 \Gamma_\phi /
m_\phi^3)^{1/5}$, which is much milder than that obtained in previous works
with small angle scatterings taken into account.
| [
{
"created": "Wed, 11 Dec 2013 09:50:52 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Dec 2013 13:46:22 GMT",
"version": "v2"
},
{
"created": "Tue, 20 May 2014 19:46:44 GMT",
"version": "v3"
}
] | 2014-05-21 | [
[
"Harigaya",
"Keisuke",
""
],
[
"Mukaida",
"Kyohei",
""
]
] | If reheating of the Universe takes place via Planck-suppressed decay, it seems that the thermalization of produced particles might be delayed, since they have large energy/small number densities and number violating large angle scatterings which decrease the momentum of particles by large amount are inefficient correspondingly. In this paper, we study the thermalization of such "under occupied" decay products in detail, following recent developments in understanding the thermalization of non-abelian plasma. Contrary to the above naive expectation, it is shown that in most cases thermalization after/during reheating occurs instantaneously by properly taking account of scatterings with small angles and of particles with small momenta. In particular, the condition for instantaneous thermalization before the completion of reheating is found to be $\alpha^{8/5} \gg (m_\phi / M_{\rm pl}) (M_{\rm pl}^2 \Gamma_\phi / m_\phi^3)^{1/5}$, which is much milder than that obtained in previous works with small angle scatterings taken into account. |
1103.0914 | Tobias Kasprzik | Ansgar Denner, Stefan Dittmaier, Tobias Kasprzik, Alexander M\"uck | Electroweak corrections to dilepton + jet production at hadron colliders | 32 pages, 13 figures. v2, further phenomenological results included,
version published in JHEP | JHEP06 (2011) 069 | 10.1007/JHEP06(2011)069 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The first calculation of the next-to-leading-order electroweak corrections to
Z-boson + jet hadroproduction including leptonic Z-boson decays is presented,
i.e. to the production of a charged lepton--anti-lepton final state in
association with one hard jet at the LHC and the Tevatron. The Z-boson
resonance is treated consistently using the complex-mass scheme, and all
off-shell effects as well as the contributions of the intermediate photon are
taken into account. The corresponding next-to-leading-order QCD corrections
have also been recalculated. The full calculation is implemented in a flexible
Monte Carlo code. Numerical results for cross sections and distributions of
this Standard Model benchmark process are presented for the Tevatron and the
LHC.
| [
{
"created": "Fri, 4 Mar 2011 14:47:33 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jul 2011 12:53:09 GMT",
"version": "v2"
}
] | 2015-05-27 | [
[
"Denner",
"Ansgar",
""
],
[
"Dittmaier",
"Stefan",
""
],
[
"Kasprzik",
"Tobias",
""
],
[
"Mück",
"Alexander",
""
]
] | The first calculation of the next-to-leading-order electroweak corrections to Z-boson + jet hadroproduction including leptonic Z-boson decays is presented, i.e. to the production of a charged lepton--anti-lepton final state in association with one hard jet at the LHC and the Tevatron. The Z-boson resonance is treated consistently using the complex-mass scheme, and all off-shell effects as well as the contributions of the intermediate photon are taken into account. The corresponding next-to-leading-order QCD corrections have also been recalculated. The full calculation is implemented in a flexible Monte Carlo code. Numerical results for cross sections and distributions of this Standard Model benchmark process are presented for the Tevatron and the LHC. |
hep-ph/9608213 | Matteo Cacciari | M. Cacciari (DESY), M. Greco (Roma III), S. Rolli (Pavia and LBNL), A.
Tanzini (Roma II) | Charmed Mesons Fragmentation Functions | Small changes in text and last figure (inclusion of Sudakov form
factors). No qualitative changes in results | Phys.Rev.D55:2736-2740,1997 | 10.1103/PhysRevD.55.2736 | DESY 96-146, LNF-96/037(P), LBNL-39175 | hep-ph | null | Fragmentation functions for heavy-light mesons, like the charmed D, D^*
mesons, are proposed. They rest on next-to-leading QCD Perturbative
Fragmentation Functions for heavy quarks, with the addition of a
non-perturbative term describing phenomenologically the quark --> meson
transition. The cross section for production of large p_T D, D^* mesons at the
Tevatron is evaluated in this framework.
| [
{
"created": "Fri, 2 Aug 1996 10:02:30 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Nov 1996 18:05:51 GMT",
"version": "v2"
}
] | 2016-09-06 | [
[
"Cacciari",
"M.",
"",
"DESY"
],
[
"Greco",
"M.",
"",
"Roma III"
],
[
"Rolli",
"S.",
"",
"Pavia and LBNL"
],
[
"Tanzini",
"A.",
"",
"Roma II"
]
] | Fragmentation functions for heavy-light mesons, like the charmed D, D^* mesons, are proposed. They rest on next-to-leading QCD Perturbative Fragmentation Functions for heavy quarks, with the addition of a non-perturbative term describing phenomenologically the quark --> meson transition. The cross section for production of large p_T D, D^* mesons at the Tevatron is evaluated in this framework. |
1001.3884 | Sebastian Cassel | S. Cassel, D. M. Ghilencea, G. G. Ross | Testing SUSY at the LHC: Electroweak and Dark matter fine tuning at
two-loop order | 36 pages, 24 figures | Nucl.Phys.B835:110-134,2010 | 10.1016/j.nuclphysb.2010.03.031 | OUTP-0930P, CERN-PH-TH-259 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of the Constrained Minimal Supersymmetric Standard Model
(CMSSM) we evaluate the electroweak fine tuning measure that provides a
quantitative test of supersymmetry as a solution to the hierarchy problem.
Taking account of current experimental constraints we compute the fine tuning
at two-loop order and determine the limits on the CMSSM parameter space and the
measurements at the LHC most relevant in covering it. Without imposing the
LEPII bound on the Higgs mass, it is shown that the fine tuning computed at
two-loop has a minimum $\Delta=8.8$ corresponding to a Higgs mass $m_h=114\pm
2$ GeV. Adding the constraint that the SUSY dark matter relic density should be
within present bounds we find $\Delta=15$ corresponding to $m_h=114.7\pm 2$ GeV
and this rises to $\Delta=17.8$ ($m_h=115.9\pm 2$ GeV) for SUSY dark matter
abundance within 3$\sigma$ of the WMAP constraint. We extend the analysis to
include the contribution of dark matter fine tuning. In this case the overall
fine tuning and Higgs mass are only marginally larger for the case SUSY dark
matter is subdominant and rises to $\Delta=28.7$ ($m_h=116.98\pm 2$ GeV) for
the case of SUSY dark matter saturates the WMAP bound. For a Higgs mass above
these values, fine tuning rises exponentially fast. The CMSSM spectrum that
corresponds to minimal fine tuning is computed and provides a benchmark for
future searches. It is characterised by heavy squarks and sleptons and light
neutralinos, charginos and gluinos.
| [
{
"created": "Fri, 22 Jan 2010 14:14:54 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Cassel",
"S.",
""
],
[
"Ghilencea",
"D. M.",
""
],
[
"Ross",
"G. G.",
""
]
] | In the framework of the Constrained Minimal Supersymmetric Standard Model (CMSSM) we evaluate the electroweak fine tuning measure that provides a quantitative test of supersymmetry as a solution to the hierarchy problem. Taking account of current experimental constraints we compute the fine tuning at two-loop order and determine the limits on the CMSSM parameter space and the measurements at the LHC most relevant in covering it. Without imposing the LEPII bound on the Higgs mass, it is shown that the fine tuning computed at two-loop has a minimum $\Delta=8.8$ corresponding to a Higgs mass $m_h=114\pm 2$ GeV. Adding the constraint that the SUSY dark matter relic density should be within present bounds we find $\Delta=15$ corresponding to $m_h=114.7\pm 2$ GeV and this rises to $\Delta=17.8$ ($m_h=115.9\pm 2$ GeV) for SUSY dark matter abundance within 3$\sigma$ of the WMAP constraint. We extend the analysis to include the contribution of dark matter fine tuning. In this case the overall fine tuning and Higgs mass are only marginally larger for the case SUSY dark matter is subdominant and rises to $\Delta=28.7$ ($m_h=116.98\pm 2$ GeV) for the case of SUSY dark matter saturates the WMAP bound. For a Higgs mass above these values, fine tuning rises exponentially fast. The CMSSM spectrum that corresponds to minimal fine tuning is computed and provides a benchmark for future searches. It is characterised by heavy squarks and sleptons and light neutralinos, charginos and gluinos. |
hep-ph/0108261 | Danny Marfatia | V. Barger, T. Han, S. Hesselbach and D. Marfatia | Testing radiative neutrino mass generation via R-parity violation at the
Tevatron | Version to appear in PLB | Phys.Lett.B538:346-352,2002 | 10.1016/S0370-2693(02)02024-5 | MADPH-01-1241 | hep-ph | null | An R-parity violating SUSY model with lepton-number violating couplings
$\lambda'_{i33}$, i=2,3 can generate a neutrino mass spectrum that explains the
recent results from neutrino oscillation experiments. These R-parity violating
couplings lead to a clean signal with at least one isolated lepton and at least
three tagged $b$ jets that is accessible in chargino and neutralino production
at the Tevatron collider. This signature can be probed at $3 \sigma$ up to
$m_{1/2} = 230$ GeV (320 GeV) with an integrated luminosity of $2 fb^{-1}$ ($30
fb^{-1}$).
| [
{
"created": "Thu, 30 Aug 2001 22:54:11 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Aug 2001 21:34:05 GMT",
"version": "v2"
},
{
"created": "Fri, 24 May 2002 23:05:53 GMT",
"version": "v3"
}
] | 2009-09-15 | [
[
"Barger",
"V.",
""
],
[
"Han",
"T.",
""
],
[
"Hesselbach",
"S.",
""
],
[
"Marfatia",
"D.",
""
]
] | An R-parity violating SUSY model with lepton-number violating couplings $\lambda'_{i33}$, i=2,3 can generate a neutrino mass spectrum that explains the recent results from neutrino oscillation experiments. These R-parity violating couplings lead to a clean signal with at least one isolated lepton and at least three tagged $b$ jets that is accessible in chargino and neutralino production at the Tevatron collider. This signature can be probed at $3 \sigma$ up to $m_{1/2} = 230$ GeV (320 GeV) with an integrated luminosity of $2 fb^{-1}$ ($30 fb^{-1}$). |
hep-ph/9312347 | D. P. Roy | Debajyoti Choudhury and D.P. Roy | Signatures of an invisibly decaying Higgs particles at LHC | (e-mail: dproy@theory.tifr.res.in) LaTex; No. of pages 12, no. of
figures 3 (available on request) | Phys.Lett.B322:368-373,1994 | 10.1016/0370-2693(94)91167-3 | null | hep-ph | null | The Higgs particle can decay dominantly into an invisible channel in the
Majoron models. We have explored the prospect of detecting such a Higgs
particle at LHC via its associated production with a gluon, Z or W boson. While
the signal/background ratio is too small for the first process, the latter two
provide viable signatures for detecting such a Higgs particle.
| [
{
"created": "Tue, 28 Dec 1993 15:11:11 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Choudhury",
"Debajyoti",
""
],
[
"Roy",
"D. P.",
""
]
] | The Higgs particle can decay dominantly into an invisible channel in the Majoron models. We have explored the prospect of detecting such a Higgs particle at LHC via its associated production with a gluon, Z or W boson. While the signal/background ratio is too small for the first process, the latter two provide viable signatures for detecting such a Higgs particle. |
hep-ph/0204013 | Ernest Ma | Ernest Ma (UC Riverside) | Neutrino Mass from Triplet and Doublet Scalars at the TeV Scale | 6 pages, no figure | Phys.Rev. D66 (2002) 037301 | 10.1103/PhysRevD.66.037301 | UCRHEP-T334 (April 2002) | hep-ph | null | If the minimal standard model of particle interactions is extended to include
a scalar triplet with lepton number $L=-2$ and a scalar doublet with $L=-1$,
neutrino masses $m_\nu \sim \mu_{12}^4 v^2/M^5 \sim 10^{-2}$ eV is possible,
where $v \sim 10^2$ GeV is the electroweak symmetry breaking scale, $M \sim 1$
TeV is the typical mass of the new scalars, and $\mu_{12} \sim 1$ GeV is a soft
lepton-number-violating parameter.
| [
{
"created": "Mon, 1 Apr 2002 21:09:27 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Ma",
"Ernest",
"",
"UC Riverside"
]
] | If the minimal standard model of particle interactions is extended to include a scalar triplet with lepton number $L=-2$ and a scalar doublet with $L=-1$, neutrino masses $m_\nu \sim \mu_{12}^4 v^2/M^5 \sim 10^{-2}$ eV is possible, where $v \sim 10^2$ GeV is the electroweak symmetry breaking scale, $M \sim 1$ TeV is the typical mass of the new scalars, and $\mu_{12} \sim 1$ GeV is a soft lepton-number-violating parameter. |
hep-ph/9502380 | null | Yi-Yen Wu (Lawrence Berkeley Laboratory) | The Minimal Supersymmetric Model of Higgs-Higgs Condensation | The discussion of the following two topics are included, (1). How
large can the lightest-Higgs mass be in the supersymmetric standard models?
(2). The triviality bound of the Higgs mass, with the conclusion that the
SUSY model of Higgs-Higgs condensation will be the most promising candidate
if the lightest-Higgs mass of the MSSM is excluded by the future experiments | Phys.Rev. D52 (1995) 6562-6576 | 10.1103/PhysRevD.52.6562 | LBL-36516, UCB-PTH-94/34 | hep-ph | null | This paper is motivated by three issues associated with the supersymmetric
extension of the standard model: the $\mu$ problem, the possibility of raising
the upper bound on the lightest-Higgs mass, and the triviality problem
associated with the Higgs sector. A new scheme based on the Higgs-Higgs
condensation is proposed, and it is shown that these three issues are well
solved by this scheme. As the first realization of this new scheme, the Minimal
Supersymmetric Model of Higgs-Higgs Condensation (MSMHHC) is constructed and
studied in detail. The MSMHHC is identical with the MSSM (Minimal
Supersymmetric Standard Model) in the fundamental particle content, and their
lagrangians differ only in the Higgs sector. The Higgs sector of the MSMHHC is
based on the softly-broken supersymmetric Nambu$-$Jona-Lasinio model with the
four-field interaction of the Higgs doublets. At low energy, these two Higgs
doublets condense into two neutral Higgs gauge singlets, and the low-energy
effective lagrangian of the MSMHHC has the form of the non-minimal
supersymmetric standard model which contains two more Higgs singlets than the
MSSM. Another unique feature of the MSMHHC is that heavy top quark always
implies strongly-interacting low-energy Higgs sector, i.e., a large mass for
the lightest Higgs boson. A systematic study of the parameter space is also
made in order to reveal the qualitative features of the MSMHHC. Finally, we
comment on the question "How large can the lightest-Higgs mass be?" with the
conclusion that the supersymmetric model of Higgs-Higgs condensation will be
the most promising candidate if the lightest-Higgs mass of the MSSM is excluded
by the future experiments.
| [
{
"created": "Fri, 24 Feb 1995 04:30:45 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Mar 1995 04:14:42 GMT",
"version": "v2"
},
{
"created": "Tue, 4 Jul 1995 04:53:12 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Wu",
"Yi-Yen",
"",
"Lawrence Berkeley Laboratory"
]
] | This paper is motivated by three issues associated with the supersymmetric extension of the standard model: the $\mu$ problem, the possibility of raising the upper bound on the lightest-Higgs mass, and the triviality problem associated with the Higgs sector. A new scheme based on the Higgs-Higgs condensation is proposed, and it is shown that these three issues are well solved by this scheme. As the first realization of this new scheme, the Minimal Supersymmetric Model of Higgs-Higgs Condensation (MSMHHC) is constructed and studied in detail. The MSMHHC is identical with the MSSM (Minimal Supersymmetric Standard Model) in the fundamental particle content, and their lagrangians differ only in the Higgs sector. The Higgs sector of the MSMHHC is based on the softly-broken supersymmetric Nambu$-$Jona-Lasinio model with the four-field interaction of the Higgs doublets. At low energy, these two Higgs doublets condense into two neutral Higgs gauge singlets, and the low-energy effective lagrangian of the MSMHHC has the form of the non-minimal supersymmetric standard model which contains two more Higgs singlets than the MSSM. Another unique feature of the MSMHHC is that heavy top quark always implies strongly-interacting low-energy Higgs sector, i.e., a large mass for the lightest Higgs boson. A systematic study of the parameter space is also made in order to reveal the qualitative features of the MSMHHC. Finally, we comment on the question "How large can the lightest-Higgs mass be?" with the conclusion that the supersymmetric model of Higgs-Higgs condensation will be the most promising candidate if the lightest-Higgs mass of the MSSM is excluded by the future experiments. |
1011.1756 | Jacques Soffer | C. Bourrely, J. Soffer and T.T. Wu | Determination of the forward slope in $p~p$ and $\bar p~p$ elastic
scattering up to LHC energy | 12 pages, 6 figures, to appear in EPJC | Eur.Phys.J.C71:1601,2011 | 10.1140/epjc/s10052-011-1601-x | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the analysis of experimental data on $p p$ (or $\bar p p$) elastic
differential cross section it is customary to define an average forward slope
$b$ in the form $\exp{(-b|t|)}$, where $t$ is the momentum transfer. Taking as
working example the results of experiments at Tevatron and SPS, we will show
with the help of the impact picture approach, that this simplifying assumption
hides interesting information on the complex non-flip scattering amplitude, and
that the slope $b$ is not a constant. We investigate the variation of this
slope parameter, including a model-independent way to extract this information
from an accurate measurement of the elastic differential cross section. An
extension of our results to the LHC energy domain is presented in view of
future experiments.
| [
{
"created": "Mon, 8 Nov 2010 10:27:40 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Mar 2011 08:46:34 GMT",
"version": "v2"
}
] | 2011-04-04 | [
[
"Bourrely",
"C.",
""
],
[
"Soffer",
"J.",
""
],
[
"Wu",
"T. T.",
""
]
] | In the analysis of experimental data on $p p$ (or $\bar p p$) elastic differential cross section it is customary to define an average forward slope $b$ in the form $\exp{(-b|t|)}$, where $t$ is the momentum transfer. Taking as working example the results of experiments at Tevatron and SPS, we will show with the help of the impact picture approach, that this simplifying assumption hides interesting information on the complex non-flip scattering amplitude, and that the slope $b$ is not a constant. We investigate the variation of this slope parameter, including a model-independent way to extract this information from an accurate measurement of the elastic differential cross section. An extension of our results to the LHC energy domain is presented in view of future experiments. |
2206.08876 | Jose Osvaldo Gonzalez Hernandez | M. Boglione, J.O. Gonzalez-Hernandez, A. Simonelli | Transverse Momentum Dependent Fragmentation Functions from recent BELLE
data | 19 pages, 14 figures, 6 tables | null | 10.1103/PhysRevD.106.074024 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new formalism for the factorization of the cross section for single hadron
production in $e^+e^-$ annihilations, differential in $z_h$, $P_T$ and thrust,
is applied to the phenomenological analysis of data recently measured by the
BELLE Collaboration. Within this scheme the $e^+e^- \to hX$ cross section can
be recast in the convolution of a perturbatively calculable coefficient and a
universal transverse momentum dependent fragmentation function. While
performing a next-to-leading order calculation of the perturbative part of the
process to next-to-leading logarithmic accuracy, we examine and thoroughly
discuss the suitability of a number of possible ansatz to model the
non-perturbative part of this universal transverse momentum dependent
fragmentation function, showing the extent to which present experimental data
can actually constrain its shape and functional form in terms of $z_h$, $P_T$
and thrust.
| [
{
"created": "Fri, 17 Jun 2022 16:25:16 GMT",
"version": "v1"
}
] | 2022-11-09 | [
[
"Boglione",
"M.",
""
],
[
"Gonzalez-Hernandez",
"J. O.",
""
],
[
"Simonelli",
"A.",
""
]
] | A new formalism for the factorization of the cross section for single hadron production in $e^+e^-$ annihilations, differential in $z_h$, $P_T$ and thrust, is applied to the phenomenological analysis of data recently measured by the BELLE Collaboration. Within this scheme the $e^+e^- \to hX$ cross section can be recast in the convolution of a perturbatively calculable coefficient and a universal transverse momentum dependent fragmentation function. While performing a next-to-leading order calculation of the perturbative part of the process to next-to-leading logarithmic accuracy, we examine and thoroughly discuss the suitability of a number of possible ansatz to model the non-perturbative part of this universal transverse momentum dependent fragmentation function, showing the extent to which present experimental data can actually constrain its shape and functional form in terms of $z_h$, $P_T$ and thrust. |
1906.10831 | Suyong Choi | Suyong Choi and Hayoung Oh | Improved Extrapolation Methods of Data-driven Background Estimation in
High-Energy Physics | 11 pages, 5 figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Data-driven methods of background estimations are often used to obtain more
reliable descriptions of backgrounds. In hadron collider experiments,
data-driven techniques are used to estimate backgrounds due to multi-jet
events, which are difficult to model accurately. In this article, we propose an
improvement on one of the most widely used data-driven methods in the hadron
collision environment, the "ABCD" method of extrapolation. We describe the
mathematical background behind the data-driven methods and extend the idea to
propose improved general methods.
| [
{
"created": "Wed, 26 Jun 2019 03:51:49 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Feb 2020 03:59:34 GMT",
"version": "v2"
},
{
"created": "Fri, 6 Mar 2020 03:49:19 GMT",
"version": "v3"
},
{
"created": "Sat, 3 Jul 2021 22:38:37 GMT",
"version": "v4"
}
] | 2021-07-06 | [
[
"Choi",
"Suyong",
""
],
[
"Oh",
"Hayoung",
""
]
] | Data-driven methods of background estimations are often used to obtain more reliable descriptions of backgrounds. In hadron collider experiments, data-driven techniques are used to estimate backgrounds due to multi-jet events, which are difficult to model accurately. In this article, we propose an improvement on one of the most widely used data-driven methods in the hadron collision environment, the "ABCD" method of extrapolation. We describe the mathematical background behind the data-driven methods and extend the idea to propose improved general methods. |
hep-ph/9901395 | Mustafa Savci | T. M. Aliev, M. Savci (Middle East Technical University-Ankara-Turkey) | Semileptonic B -> a_1 l nu decay in QCD | 12 pages, 2 figures, LaTeX formatted | Phys.Lett. B456 (1999) 256-263 | 10.1016/S0370-2693(99)00466-9 | METU-PHYS-HEP-99-3 | hep-ph | null | The form factors and the branching ratio of the "B -> a_1 l nu" decay are
calculated in framework of QCD sum rules. A comparison of our results on form
factors and branching ratio with the results from constituent quark model is
presented.
| [
{
"created": "Sun, 24 Jan 1999 17:50:10 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Aliev",
"T. M.",
"",
"Middle East Technical University-Ankara-Turkey"
],
[
"Savci",
"M.",
"",
"Middle East Technical University-Ankara-Turkey"
]
] | The form factors and the branching ratio of the "B -> a_1 l nu" decay are calculated in framework of QCD sum rules. A comparison of our results on form factors and branching ratio with the results from constituent quark model is presented. |
hep-ph/9705419 | Seungho Choe | Seungho Choe (Yonsei University) | Multiquark states and QCD sum rules | Latex, 6 pages, 2 ps figures. Talk given at YITP international
Workshop on Recent Developments in QCD and Hadron Physics, Kyoto, Japan, Dec.
16-18, 1996 | Soryushiron Kenkyu 95:D87,1997 | null | null | hep-ph nucl-th | null | There have been arguments about hadronic molecules, which are weakly-bound
states of two or more hadrons. We investigate the possibility of some
candidates (f0 (980), a0 (980), f0 (1500), f0 (1710), etc.) using QCD sum rule
approach and compare our results with multiquark states in the MIT bag model.
We find that f0 (1500), f0 (1710) can be good candidates for vector-vector
molecule-type multiquark states.
| [
{
"created": "Mon, 26 May 1997 04:28:13 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Choe",
"Seungho",
"",
"Yonsei University"
]
] | There have been arguments about hadronic molecules, which are weakly-bound states of two or more hadrons. We investigate the possibility of some candidates (f0 (980), a0 (980), f0 (1500), f0 (1710), etc.) using QCD sum rule approach and compare our results with multiquark states in the MIT bag model. We find that f0 (1500), f0 (1710) can be good candidates for vector-vector molecule-type multiquark states. |
1706.08309 | Nicolas Greiner | Daniel Faeh, Nicolas Greiner | Diphoton production in association with two bottom jets | 19 pages, 10 figures | null | 10.1140/epjc/s10052-017-5296-5 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the production of a photon pair in association with two bottom jets
at the LHC. This process constitutes an important background to double Higgs
production with the subsequent decay of the two Higgs bosons into a pair of
photons and b-quarks respectively. We calculate this process at next-to-leading
order accuracy in QCD and find that QCD corrections lead to a substantial
increase of the production cross section due to new channels opening up at
next-to-leading order and their inclusion is therefore inevitable for a
reliable prediction. Furthermore, the approximation of massless b-quarks is
scrutinized by calculating the process with both massless and massive b-quarks.
We find that the massive bottom quark leads to a substantial reduction of the
cross section where the biggest effect is however due to the use of a four
flavor PDF set and the corresponding smaller values for the strong coupling
constant.
| [
{
"created": "Mon, 26 Jun 2017 10:19:57 GMT",
"version": "v1"
}
] | 2017-12-06 | [
[
"Faeh",
"Daniel",
""
],
[
"Greiner",
"Nicolas",
""
]
] | We study the production of a photon pair in association with two bottom jets at the LHC. This process constitutes an important background to double Higgs production with the subsequent decay of the two Higgs bosons into a pair of photons and b-quarks respectively. We calculate this process at next-to-leading order accuracy in QCD and find that QCD corrections lead to a substantial increase of the production cross section due to new channels opening up at next-to-leading order and their inclusion is therefore inevitable for a reliable prediction. Furthermore, the approximation of massless b-quarks is scrutinized by calculating the process with both massless and massive b-quarks. We find that the massive bottom quark leads to a substantial reduction of the cross section where the biggest effect is however due to the use of a four flavor PDF set and the corresponding smaller values for the strong coupling constant. |
hep-ph/9703232 | Ewan Davidson Stewart | Ewan D. Stewart | Flattening the Inflaton's Potential with Quantum Corrections II | 14 pages, latex, 3 epsf figures | Phys. Rev. D 56, 2019 (1997) | 10.1103/PhysRevD.56.2019 | RESCEU-9/97 | hep-ph astro-ph gr-qc hep-th | null | In a previous paper I showed that a classical scalar potential with $V''/V
\sim 1$ can be sufficiently flattened by quantum corrections to give rise to
slow-roll inflation. In this paper I give a hybrid inflation implementation of
that idea which can naturally produce a spectral index in the observationally
viable range even for $V^{1/4} \sim 10^{10}$ to $10^{11}$ GeV. Although any
observationally viable spectral index can be obtained, the model does predict a
distinctive spectral shape.
| [
{
"created": "Tue, 4 Mar 1997 17:07:31 GMT",
"version": "v1"
}
] | 2016-08-24 | [
[
"Stewart",
"Ewan D.",
""
]
] | In a previous paper I showed that a classical scalar potential with $V''/V \sim 1$ can be sufficiently flattened by quantum corrections to give rise to slow-roll inflation. In this paper I give a hybrid inflation implementation of that idea which can naturally produce a spectral index in the observationally viable range even for $V^{1/4} \sim 10^{10}$ to $10^{11}$ GeV. Although any observationally viable spectral index can be obtained, the model does predict a distinctive spectral shape. |
2011.13291 | Zhi-Gang Wang | Zun-Yan Di, Zhi-Gang Wang, Guo-Liang Yu | Analysis of the possible $D\bar{D}_{s0}^*(2317)$ and
$D^*\bar{D}_{s1}^*(2460)$ molecules with QCD sum rules | 17 pages, 10 figures. arXiv admin note: text overlap with
arXiv:1806.08703, arXiv:1901.05196, arXiv:1802.05354 | Commun.Theor.Phys.71(2019)685 | 10.1088/0253-6102/71/6/685 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this article, we assume that there exist the pseudoscalar
$D\bar{D}_{s0}^*(2317)$ and $D^*\bar{D}_{s1}^*(2460)$ molecular states
$Z_{1,2}$ and construct the color singlet-singlet molecule-type interpolating
currents to study their masses with the QCD sum rules. In calculations, we
consider the contributions of the vacuum condensates up to dimension-10 and use
the formula $\mu=\sqrt{M_{X/Y/Z}^{2}-\left(2{\mathbb{M}}_{c}\right)^{2}}$ to
determine the energy scales of the QCD spectral densities. The numerical
results, $M_{Z_1}=4.61_{-0.08}^{+0.11}\,\text{GeV}$ and
$M_{Z_2}=4.60_{-0.06}^{+0.07}\,\text{GeV}$, which lie above the
$D\bar{D}_{s0}^*(2317)$ and $D^*\bar{D}_{s1}^*(2460)$ thresholds respectively,
indicate that the $D\bar{D}_{s0}^*(2317)$ and $D^*\bar{D}_{s1}^*(2460)$ are
difficult to form bound state molecular states, the $Z_{1,2}$ are probably
resonance states.
| [
{
"created": "Thu, 26 Nov 2020 13:45:20 GMT",
"version": "v1"
}
] | 2020-11-30 | [
[
"Di",
"Zun-Yan",
""
],
[
"Wang",
"Zhi-Gang",
""
],
[
"Yu",
"Guo-Liang",
""
]
] | In this article, we assume that there exist the pseudoscalar $D\bar{D}_{s0}^*(2317)$ and $D^*\bar{D}_{s1}^*(2460)$ molecular states $Z_{1,2}$ and construct the color singlet-singlet molecule-type interpolating currents to study their masses with the QCD sum rules. In calculations, we consider the contributions of the vacuum condensates up to dimension-10 and use the formula $\mu=\sqrt{M_{X/Y/Z}^{2}-\left(2{\mathbb{M}}_{c}\right)^{2}}$ to determine the energy scales of the QCD spectral densities. The numerical results, $M_{Z_1}=4.61_{-0.08}^{+0.11}\,\text{GeV}$ and $M_{Z_2}=4.60_{-0.06}^{+0.07}\,\text{GeV}$, which lie above the $D\bar{D}_{s0}^*(2317)$ and $D^*\bar{D}_{s1}^*(2460)$ thresholds respectively, indicate that the $D\bar{D}_{s0}^*(2317)$ and $D^*\bar{D}_{s1}^*(2460)$ are difficult to form bound state molecular states, the $Z_{1,2}$ are probably resonance states. |
hep-ph/9903438 | Claude Bourrely | C. Bourrely, J. Soffer and Tai Tsun Wu | Impact-picture predictions for the $\gamma\gamma$ total cross section at
LEP | 5 pages, Latex, 1 figure. Revised version | Mod.Phys.Lett.A15:9-13,2000 | 10.1016/S0217-7323(00)00003-7 | CPT-99/P.3793, CERN-TH/99-76 | hep-ph | null | We show that the rising total cross section $\sigma(\gamma\gamma \to
hadrons)$ recently observed by the L3 and OPAL Collaborations at LEP are fully
consistent with the impact-picture for high-energy scattering. The impact
picture is then used to predict this total cross section at higher energies.
These experimental results confirm once more the success of the theoretical
approach, which predicted for the first time, nearly thirty years ago, the
universal increase of total cross sections at high energies.
| [
{
"created": "Mon, 22 Mar 1999 11:49:32 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Jun 1999 12:19:13 GMT",
"version": "v2"
}
] | 2009-12-15 | [
[
"Bourrely",
"C.",
""
],
[
"Soffer",
"J.",
""
],
[
"Wu",
"Tai Tsun",
""
]
] | We show that the rising total cross section $\sigma(\gamma\gamma \to hadrons)$ recently observed by the L3 and OPAL Collaborations at LEP are fully consistent with the impact-picture for high-energy scattering. The impact picture is then used to predict this total cross section at higher energies. These experimental results confirm once more the success of the theoretical approach, which predicted for the first time, nearly thirty years ago, the universal increase of total cross sections at high energies. |
1404.2924 | Felix Yu | Felix Yu | Anatomizing Exotic Production of the Higgs Boson | 27 pages | Phys. Rev. D 90, 015009 (2014) | 10.1103/PhysRevD.90.015009 | FERMILAB-PUB-14-072-T | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss exotic production modes of the Higgs boson and how their
phenomenology can be probed in current Higgs analyses. We highlight the
importance of differential distributions in disentangling standard production
mechanisms from exotic modes. We present two model benchmarks for exotic Higgs
production arising from chargino-neutralino production and study their impact
on the current Higgs dataset. As a corollary, we emphasize that current Higgs
coupling fits do not fully explore the space of new physics deviations possible
in Higgs data.
| [
{
"created": "Thu, 10 Apr 2014 19:59:25 GMT",
"version": "v1"
}
] | 2014-07-16 | [
[
"Yu",
"Felix",
""
]
] | We discuss exotic production modes of the Higgs boson and how their phenomenology can be probed in current Higgs analyses. We highlight the importance of differential distributions in disentangling standard production mechanisms from exotic modes. We present two model benchmarks for exotic Higgs production arising from chargino-neutralino production and study their impact on the current Higgs dataset. As a corollary, we emphasize that current Higgs coupling fits do not fully explore the space of new physics deviations possible in Higgs data. |
hep-ph/9506279 | Gerhard Schuler | Gerhard A. Schuler (CERN and Regensburg) | On the non-perturbative part of the photon structure function | Latex, 7 pages | null | null | CERN-TH/95-153 | hep-ph | null | We discuss a dispersion relation in the photon mass and show how (in
principle) model-independent constraints on the parton distribution functions
of the photon, notably a momentum sumrule, can be obtained. We present two sets
of parametrizations, SaS~1 and~2, corresponding to two rather extreme
realizations of the non-perturbative part. Inclusive electron scattering off a
real photon is found to be insufficient to constrain the non-perturbative
components. The additional sensitivity provided by the photon virtuality is
outlined. Previous approaches to model the non-perturbative input distributions
are commented upon.
| [
{
"created": "Fri, 9 Jun 1995 13:53:03 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Schuler",
"Gerhard A.",
"",
"CERN and Regensburg"
]
] | We discuss a dispersion relation in the photon mass and show how (in principle) model-independent constraints on the parton distribution functions of the photon, notably a momentum sumrule, can be obtained. We present two sets of parametrizations, SaS~1 and~2, corresponding to two rather extreme realizations of the non-perturbative part. Inclusive electron scattering off a real photon is found to be insufficient to constrain the non-perturbative components. The additional sensitivity provided by the photon virtuality is outlined. Previous approaches to model the non-perturbative input distributions are commented upon. |
1701.06935 | Wilfried Buchmuller | Wilfried Buchmuller and Julian Schweizer | Flavour mixings in flux compactifications | 28 pages, 3 figures, 3 tables | Phys. Rev. D 95, 075024 (2017) | 10.1103/PhysRevD.95.075024 | DESY 16-238 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A multiplicity of quark-lepton families can naturally arise as zero-modes in
flux compactifications. The flavour structure of quark and lepton mass matrices
is then determined by the wave function profiles of the zero-modes. We consider
a supersymmetric $SO(10)\times U(1)$ model in six dimensions compactified on
the orbifold $T^2/{\mathbb Z_2}$ with Abelian magnetic flux. A bulk
$\mathbf{16}$-plet charged under the $U(1)$ provides the quark-lepton
generations whereas two uncharged $\mathbf{10}$-plets yield two Higgs doublets.
Bulk anomaly cancellation requires the presence of additional $\mathbf{16}$-
and $\mathbf{10}$-plets. The corresponding zero-modes form vectorlike split
multiplets that are needed to obtain a successful flavour phenomenology. We
analyze the pattern of flavour mixings for the two heaviest families of the
Standard Model and discuss possible generalizations to three and more
generations.
| [
{
"created": "Tue, 24 Jan 2017 15:38:48 GMT",
"version": "v1"
}
] | 2017-04-26 | [
[
"Buchmuller",
"Wilfried",
""
],
[
"Schweizer",
"Julian",
""
]
] | A multiplicity of quark-lepton families can naturally arise as zero-modes in flux compactifications. The flavour structure of quark and lepton mass matrices is then determined by the wave function profiles of the zero-modes. We consider a supersymmetric $SO(10)\times U(1)$ model in six dimensions compactified on the orbifold $T^2/{\mathbb Z_2}$ with Abelian magnetic flux. A bulk $\mathbf{16}$-plet charged under the $U(1)$ provides the quark-lepton generations whereas two uncharged $\mathbf{10}$-plets yield two Higgs doublets. Bulk anomaly cancellation requires the presence of additional $\mathbf{16}$- and $\mathbf{10}$-plets. The corresponding zero-modes form vectorlike split multiplets that are needed to obtain a successful flavour phenomenology. We analyze the pattern of flavour mixings for the two heaviest families of the Standard Model and discuss possible generalizations to three and more generations. |
1004.3192 | Valeriy Nazaruk | V.I.Nazaruk | $n\bar{n}$ conversion in finite nuclei | 12 pages, 1 figures | null | 10.1142/S0218301311018368 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The new model of $n\bar{n}$ transitions in nuclei based on unitary $S$-matrix
is considered. The $|in>$-state of nucleus is described by single-particle
shell model. The dynamical process part is calculated by means of
field-theoretical approach with finite time interval. The lower limit on the
free-space $n\bar{n}$ oscillation time $\tau_{{\rm min}}$ is in the range
$10^{16}\; {\rm yr}>\tau_{{\rm min}}>1.2\cdot 10^{9}\; {\rm s}$. \end{abstract}
| [
{
"created": "Mon, 19 Apr 2010 13:45:36 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Apr 2010 13:46:55 GMT",
"version": "v2"
},
{
"created": "Sun, 6 Feb 2011 16:39:00 GMT",
"version": "v3"
}
] | 2015-05-18 | [
[
"Nazaruk",
"V. I.",
""
]
] | The new model of $n\bar{n}$ transitions in nuclei based on unitary $S$-matrix is considered. The $|in>$-state of nucleus is described by single-particle shell model. The dynamical process part is calculated by means of field-theoretical approach with finite time interval. The lower limit on the free-space $n\bar{n}$ oscillation time $\tau_{{\rm min}}$ is in the range $10^{16}\; {\rm yr}>\tau_{{\rm min}}>1.2\cdot 10^{9}\; {\rm s}$. \end{abstract} |
1510.08452 | Anton Rebhan | Frederic Br\"unner, Anton Rebhan | Glueball Decay in the Witten-Sakai-Sugimoto Model and Finite Quark
Masses | 8 pages, 1 figure. To appear in the proceedings of the 8th
International Workshop on Chiral Dynamics, CD2015, Pisa,Italy | null | null | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss recent results on the calculation of glueball decay rates in the
Witten-Sakai-Sugimoto model, which favor the $f_0(1710)$ meson as a glueball
candidate. The flavor asymmetric decay of $f_0(1710)$ is frequently attributed
to a putative chiral suppression in glueball decays, which is however
questionable in view of the large constituent quark masses induced by chiral
symmetry breaking. We find that this can be explained by what we call nonchiral
enhancement when finite quark masses are included in the holographic model,
with good quantitative agreement with experimental data for $f_0(1710)$.
Assuming the latter to indeed be a nearly pure glueball, the model makes
essentially parameter-free and thus falsifiable predictions for its decay rates
involving vector mesons and an upper limit on the $\eta\eta'$ decay rate.
| [
{
"created": "Wed, 28 Oct 2015 20:05:16 GMT",
"version": "v1"
}
] | 2015-10-30 | [
[
"Brünner",
"Frederic",
""
],
[
"Rebhan",
"Anton",
""
]
] | We discuss recent results on the calculation of glueball decay rates in the Witten-Sakai-Sugimoto model, which favor the $f_0(1710)$ meson as a glueball candidate. The flavor asymmetric decay of $f_0(1710)$ is frequently attributed to a putative chiral suppression in glueball decays, which is however questionable in view of the large constituent quark masses induced by chiral symmetry breaking. We find that this can be explained by what we call nonchiral enhancement when finite quark masses are included in the holographic model, with good quantitative agreement with experimental data for $f_0(1710)$. Assuming the latter to indeed be a nearly pure glueball, the model makes essentially parameter-free and thus falsifiable predictions for its decay rates involving vector mesons and an upper limit on the $\eta\eta'$ decay rate. |
hep-ph/0205181 | Christine T. H. Davies | Christine Davies | Lattice QCD | Lectures given at 55th Scottish Universities Summer School, St
Andrews, August 2001 | Heavy Flavour Physics, Scottish Graduate Textbook Series,
Institute of Physics 2002, eds C. T. H. Davies and S. M. Playfer | null | null | hep-ph hep-lat | null | A general introduction to lattice QCD suitable for graduate students in
experimental and theoretical particle physics. Aimed at those who want to know
how lattice calculations are done, and what the pitfalls are, without having to
do the calculations themselves.
| [
{
"created": "Thu, 16 May 2002 14:12:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Davies",
"Christine",
""
]
] | A general introduction to lattice QCD suitable for graduate students in experimental and theoretical particle physics. Aimed at those who want to know how lattice calculations are done, and what the pitfalls are, without having to do the calculations themselves. |
hep-ph/9503371 | PostDoc Its | Xiao-Gang He | TEST OF CP VIOLATION IN NON-LEPTONIC HYPERON DECAYS | 3 pages. Talk presented at the Beyond the Standard Model IV, Lake
Tahoe, California, December 13 - 18, 1994 | null | null | OITS-573 | hep-ph | null | In this talk I discuss CP violation in hyperon decays in Left-Right symmetric
models. I show that the asymmetry in polarization in $\Lambda \to p\pi^-$ can
be as large as $6\times 10^{-4}$ in these models, which is an order of
magnitude larger than the Standard Model prediction.
| [
{
"created": "Sat, 18 Mar 1995 00:05:58 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"He",
"Xiao-Gang",
""
]
] | In this talk I discuss CP violation in hyperon decays in Left-Right symmetric models. I show that the asymmetry in polarization in $\Lambda \to p\pi^-$ can be as large as $6\times 10^{-4}$ in these models, which is an order of magnitude larger than the Standard Model prediction. |
hep-ph/9607243 | Becirevic | Damir Becirevic | $B \to \rho \ell \nu_\ell$ Form Factors | 15 pages, Latex, 4 figures | Phys. Rev. D 54, 6842 (1996) | 10.1103/PhysRevD.54.6842 | LPTHE 96/52 | hep-ph | null | The bounds on the form factors for $B \to \rho \ell \nu_\ell$ decay are
studied. Constrained by lattice data and a constrained conformal mapping, the
more informations can be obtained for $A_1(q^2)$ form-factor which dominates
the decay rate at large $q^2$. Specifically, we confirm a moderately increasing
behavior of this form factor.
| [
{
"created": "Thu, 4 Jul 1996 19:34:36 GMT",
"version": "v1"
}
] | 2016-08-24 | [
[
"Becirevic",
"Damir",
""
]
] | The bounds on the form factors for $B \to \rho \ell \nu_\ell$ decay are studied. Constrained by lattice data and a constrained conformal mapping, the more informations can be obtained for $A_1(q^2)$ form-factor which dominates the decay rate at large $q^2$. Specifically, we confirm a moderately increasing behavior of this form factor. |
2201.01040 | Vishal Ngairangbam Singh | Partha Konar and Vishal S. Ngairangbam | Influence of QCD parton shower in deep learning invisible Higgs through
vector boson fusion | Added inference results for different signals on each trained network
and comparison with matched LO samples for both recoil schemes. Matches
accepted version in PRD | null | 10.1103/PhysRevD.105.113003 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Vector boson fusion established itself as a highly reliable channel to probe
the Higgs boson and an avenue to uncover new physics at the Large Hadron
Collider. This channel provides the most stringent bound on Higgs' invisible
decay branching ratio, where the current upper limits are significantly higher
than the one expected in the Standard Model. It is remarkable that merely
low-level calorimeter data from this characteristically simple process can
improve this limit substantially by employing sophisticated deep-learning
techniques. The construction of such neural networks seems to comprehend the
event kinematics and radiation pattern exceptionally well. However, the full
potential of this outstanding capability also warrants a precise theoretical
projection of QCD parton showering and corresponding radiation pattern. This
work demonstrates the relation using different recoil schemes in the parton
shower with leading order and higher-order computation.
| [
{
"created": "Tue, 4 Jan 2022 08:42:20 GMT",
"version": "v1"
},
{
"created": "Thu, 19 May 2022 06:27:57 GMT",
"version": "v2"
}
] | 2022-06-29 | [
[
"Konar",
"Partha",
""
],
[
"Ngairangbam",
"Vishal S.",
""
]
] | Vector boson fusion established itself as a highly reliable channel to probe the Higgs boson and an avenue to uncover new physics at the Large Hadron Collider. This channel provides the most stringent bound on Higgs' invisible decay branching ratio, where the current upper limits are significantly higher than the one expected in the Standard Model. It is remarkable that merely low-level calorimeter data from this characteristically simple process can improve this limit substantially by employing sophisticated deep-learning techniques. The construction of such neural networks seems to comprehend the event kinematics and radiation pattern exceptionally well. However, the full potential of this outstanding capability also warrants a precise theoretical projection of QCD parton showering and corresponding radiation pattern. This work demonstrates the relation using different recoil schemes in the parton shower with leading order and higher-order computation. |
1408.4785 | Ernest Ma | Sean Fraser, Ernest Ma, and Oleg Popov | Scotogenic Inverse Seesaw Model of Neutrino Mass | 10 pages, 2 figures, version to appear in PLB | null | 10.1016/j.physletb.2014.08.069 | UCRHEP-T543 (Aug 2014) | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A variation of the original 2006 radiative seesaw model of neutrino mass
through dark matter is shown to realize the notion of inverse seesaw naturally.
The dark-matter candidate here is the lightest of three real singlet scalars
which may also carry flavor.
| [
{
"created": "Wed, 20 Aug 2014 19:58:37 GMT",
"version": "v1"
},
{
"created": "Sun, 31 Aug 2014 16:30:51 GMT",
"version": "v2"
}
] | 2015-06-22 | [
[
"Fraser",
"Sean",
""
],
[
"Ma",
"Ernest",
""
],
[
"Popov",
"Oleg",
""
]
] | A variation of the original 2006 radiative seesaw model of neutrino mass through dark matter is shown to realize the notion of inverse seesaw naturally. The dark-matter candidate here is the lightest of three real singlet scalars which may also carry flavor. |
hep-ph/9702250 | Bob Holdom | B. Holdom | Dynamical Nonsupersymmetry Breaking | 13 pages, 2 figures, Talk given at the International Workshop on
Perspectives of Strong Coupling Gauge Theories (SCGT96), November 1996,
Nagoya, Japan | null | null | UTPT-97-02 | hep-ph | null | We emphasize the role that anomalous power-law scaling of 4-fermion
operators, occurring in the presence of new strong interactions, could have in
the generation of quark and lepton masses.
| [
{
"created": "Tue, 4 Feb 1997 19:04:58 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Holdom",
"B.",
""
]
] | We emphasize the role that anomalous power-law scaling of 4-fermion operators, occurring in the presence of new strong interactions, could have in the generation of quark and lepton masses. |
hep-ph/0407221 | Tetsuya Onogi | Shoji Hashimoto (KEK) and Tetsuya Onogi (YITP) | Heavy Quarks on the Lattice | 38 pages, Latex, ar.sty, 7 figures. A review based on the work until
February 2004. To appear in the Annual Review of Nuclear & Particle Science,
Vol. 54 | Ann.Rev.Nucl.Part.Sci. 54 (2004) 451-486 | 10.1146/annurev.nucl.53.041002.110550 | KEK-CP-155, YITP-04-40 | hep-ph | null | Lattice quantum chromodynamics provides first principles calculations for
hadrons containing heavy quarks -- charm and bottom quarks. Their mass spectra,
decay rates, and some hadronic matrix elements can be calculated on the lattice
in a model independent manner. In this review, we introduce the effective
theories that treat heavy quarks on the lattice. We summarize results on the
heavy quarkonium spectrum, which verify the validity of the effective theory
approach. We then discuss applications to $B$ physics, which is the main target
of the lattice theory of heavy quarks. We review progress in lattice
calculations of the $B$ meson decay constant, the $B$ parameter, semi-leptonic
decay form factors, and other important quantities.)
| [
{
"created": "Tue, 20 Jul 2004 04:49:45 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Hashimoto",
"Shoji",
"",
"KEK"
],
[
"Onogi",
"Tetsuya",
"",
"YITP"
]
] | Lattice quantum chromodynamics provides first principles calculations for hadrons containing heavy quarks -- charm and bottom quarks. Their mass spectra, decay rates, and some hadronic matrix elements can be calculated on the lattice in a model independent manner. In this review, we introduce the effective theories that treat heavy quarks on the lattice. We summarize results on the heavy quarkonium spectrum, which verify the validity of the effective theory approach. We then discuss applications to $B$ physics, which is the main target of the lattice theory of heavy quarks. We review progress in lattice calculations of the $B$ meson decay constant, the $B$ parameter, semi-leptonic decay form factors, and other important quantities.) |
hep-ph/0309165 | Ian Jack Dr | I. Jack, D.R.T. Jones and R. Wild | Yukawa Textures and the mu-term | 12 pages, uses Harvmac (option "b") | Phys.Lett. B580 (2004) 72-78 | 10.1016/j.physletb.2003.11.027 | LTH 592 | hep-ph | null | We show how with an anomaly-free U(1), simple assumptions concerning the
origin of Yukawa textures and the Higgs mu-term lead to the prediction of a new
physics scale of 10^8GeV and automatic conservation of baryon number.
| [
{
"created": "Mon, 15 Sep 2003 14:54:48 GMT",
"version": "v1"
}
] | 2010-04-05 | [
[
"Jack",
"I.",
""
],
[
"Jones",
"D. R. T.",
""
],
[
"Wild",
"R.",
""
]
] | We show how with an anomaly-free U(1), simple assumptions concerning the origin of Yukawa textures and the Higgs mu-term lead to the prediction of a new physics scale of 10^8GeV and automatic conservation of baryon number. |
1407.1317 | Pilar Coloma | Mattias Blennow, Pilar Coloma and Enrique Fernandez-Martinez | Searching for sterile neutrinos at the ESS$\nu$SB | 8 pages, 1 figure | null | 10.1007/JHEP12(2014)120 | FTUAM-14-24, IFT-UAM/CSIC-14-059, NORDITA-2014-81 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The ESS$\nu$SB project is a proposed neutrino oscillation experiment based on
the European Spallation Source with the search for leptonic CP as its main aim.
In this letter we show that a near detector at around 1 km distance from the
beamline is not only very desirable for keeping the systematic errors affecting
the CP search under control, but would also provide a significant sensitivity
probe for sterile neutrino oscillations in the region of the parameter space
favored by the long-standing LSND anomaly. We find that the effective mixing
angle $\theta_{\mu e}$ can be probed down to $\sin^2(2\theta_{\mu e}) \simeq
2(8)\cdot 10^{-3}$ at $5\sigma$ assuming 15% bin-to-bin (un)correlated
systematics.
| [
{
"created": "Fri, 4 Jul 2014 20:00:09 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Blennow",
"Mattias",
""
],
[
"Coloma",
"Pilar",
""
],
[
"Fernandez-Martinez",
"Enrique",
""
]
] | The ESS$\nu$SB project is a proposed neutrino oscillation experiment based on the European Spallation Source with the search for leptonic CP as its main aim. In this letter we show that a near detector at around 1 km distance from the beamline is not only very desirable for keeping the systematic errors affecting the CP search under control, but would also provide a significant sensitivity probe for sterile neutrino oscillations in the region of the parameter space favored by the long-standing LSND anomaly. We find that the effective mixing angle $\theta_{\mu e}$ can be probed down to $\sin^2(2\theta_{\mu e}) \simeq 2(8)\cdot 10^{-3}$ at $5\sigma$ assuming 15% bin-to-bin (un)correlated systematics. |
2305.11079 | Jamal Jalilian-Marian | Tolga Altinoluk, Guillaume Beuf and Jamal Jalilian-Marian | Renormalization of the gluon distribution function in the background
field formalism | Latex, 20 pages, 2 figures | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | We derive the Leading Order DGLAP evolution of gluon distribution function in
the target light cone gauge starting from its standard operator definition. The
derivation is performed using the background field formalism employed in the
Color Glass Condensate effective theory of small $x$ QCD. We adopt
Mandelstam-Leibbrandt prescription to regulate in an unambiguous way the
spurious singularity appearing in the light-cone gauge Feynman propagator. UV
divergences are regulated via conventional dimensional regularization. The
methods introduced in this paper represent the first steps in the construction
of a unified framework for QCD evolution, which could address collinear physics
as well as small $x$ physics and gluon saturation.
| [
{
"created": "Thu, 18 May 2023 16:08:03 GMT",
"version": "v1"
}
] | 2023-05-19 | [
[
"Altinoluk",
"Tolga",
""
],
[
"Beuf",
"Guillaume",
""
],
[
"Jalilian-Marian",
"Jamal",
""
]
] | We derive the Leading Order DGLAP evolution of gluon distribution function in the target light cone gauge starting from its standard operator definition. The derivation is performed using the background field formalism employed in the Color Glass Condensate effective theory of small $x$ QCD. We adopt Mandelstam-Leibbrandt prescription to regulate in an unambiguous way the spurious singularity appearing in the light-cone gauge Feynman propagator. UV divergences are regulated via conventional dimensional regularization. The methods introduced in this paper represent the first steps in the construction of a unified framework for QCD evolution, which could address collinear physics as well as small $x$ physics and gluon saturation. |
hep-ph/0105221 | Asmaa Abada | A. Abada, Ph. Boucaud, G. Herdoiza, J.P. Leroy, J. Micheli, O. P\`ene,
J. Rodr\'iguez-Quintero | Preliminaries on a Lattice Analysis of The Pion Light-cone Wave
function: a Partonic Signal? | 23 pages, 21 PS figures, Latex | Phys.Rev.D64:074511,2001 | 10.1103/PhysRevD.64.074511 | LPT Orsay/00-111, UHU-FT/00-03 | hep-ph hep-lat | null | We present the first attempt of a new method to compute the pion light-cone
wave function (LCWF) on the lattice. We compute the matrix element between the
pion and the vacuum of a non-local operator: the propagator of a ``scalar
quark'' (named for short "squark"). A theoretical analysis shows that for some
kinematical conditions (energetic pion and hard squark) this matrix element
depends dominantly on the LCWF $\Phi_\pi(u), u\in [0,1]$. On the lattice, the
discretization of the parton momenta imposes further constraints on the pion
momentum. The two-point Green functions made of squark-quark and squark-squark
fields show hadron-like bound-state behaviour and verify the standard energy
spectrum. We show some indications that during a short time, after being
created, the system of the spectator quark and the squark behave like partons,
before they form a hadron-like bound state. This short time is the place where
the partonic wave function has to be looked for.
| [
{
"created": "Tue, 22 May 2001 09:04:56 GMT",
"version": "v1"
}
] | 2016-08-16 | [
[
"Abada",
"A.",
""
],
[
"Boucaud",
"Ph.",
""
],
[
"Herdoiza",
"G.",
""
],
[
"Leroy",
"J. P.",
""
],
[
"Micheli",
"J.",
""
],
[
"Pène",
"O.",
""
],
[
"Rodríguez-Quintero",
"J.",
""
]
] | We present the first attempt of a new method to compute the pion light-cone wave function (LCWF) on the lattice. We compute the matrix element between the pion and the vacuum of a non-local operator: the propagator of a ``scalar quark'' (named for short "squark"). A theoretical analysis shows that for some kinematical conditions (energetic pion and hard squark) this matrix element depends dominantly on the LCWF $\Phi_\pi(u), u\in [0,1]$. On the lattice, the discretization of the parton momenta imposes further constraints on the pion momentum. The two-point Green functions made of squark-quark and squark-squark fields show hadron-like bound-state behaviour and verify the standard energy spectrum. We show some indications that during a short time, after being created, the system of the spectator quark and the squark behave like partons, before they form a hadron-like bound state. This short time is the place where the partonic wave function has to be looked for. |
hep-ph/9610267 | Bernd Kniehl | B.A. Kniehl (MPI Munich), G. Kramer (Hamburg University), M. Spira
(CERN) | Large-p_T Photoproduction of D^*+- Mesons in ep Collisions | 31 pages (Latex), 13 figures (Postscript). This version of the
manuscript is identical with the one being printed in Z. Phys. C | Z.Phys.C76:689-700,1997 | 10.1007/s002880050591 | CERN-TH/96-274, DESY 96-210, MPI/PhT/96-103 | hep-ph hep-ex | null | The cross section for the inclusive photoproduction of large-p_T D^*+- mesons
is calculated at next-to-leading order, adopting different approaches to
describe the fragmentation of charm quarks into D^*+- mesons. We treat the
charm quark according to the massless factorization scheme, where it is assumed
to be one of the active flavours inside the proton and the photon. We present
inclusive single-particle distributions in transverse momentum and rapidity,
including the contributions due to both direct and resolved photons. We compare
and assess the various implementations of fragmentation. We argue that, in the
high-p_T regime, a particularly realistic description can be obtained by
convoluting the Altarelli-Parisi-evolved fragmentation functions of Peterson et
al. with the hard-scattering cross sections of massless partons where the
factorization of the collinear singularities associated with final-state charm
quarks is converted to the massive-charm scheme. The predictions thus obtained
agree well with recent experimental data by the H1 and ZEUS Collaborations at
DESY HERA.
| [
{
"created": "Mon, 7 Oct 1996 13:13:00 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jun 1997 12:39:38 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Oct 1997 08:23:18 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Kniehl",
"B. A.",
"",
"MPI Munich"
],
[
"Kramer",
"G.",
"",
"Hamburg University"
],
[
"Spira",
"M.",
"",
"CERN"
]
] | The cross section for the inclusive photoproduction of large-p_T D^*+- mesons is calculated at next-to-leading order, adopting different approaches to describe the fragmentation of charm quarks into D^*+- mesons. We treat the charm quark according to the massless factorization scheme, where it is assumed to be one of the active flavours inside the proton and the photon. We present inclusive single-particle distributions in transverse momentum and rapidity, including the contributions due to both direct and resolved photons. We compare and assess the various implementations of fragmentation. We argue that, in the high-p_T regime, a particularly realistic description can be obtained by convoluting the Altarelli-Parisi-evolved fragmentation functions of Peterson et al. with the hard-scattering cross sections of massless partons where the factorization of the collinear singularities associated with final-state charm quarks is converted to the massive-charm scheme. The predictions thus obtained agree well with recent experimental data by the H1 and ZEUS Collaborations at DESY HERA. |
hep-ph/0112033 | Carlos Munoz | D.G. Cerdeno, S. Khalil, C. Munoz | Large dark matter cross sections from supergravity and superstrings | Talk given at COSMO-01, Rovaniemi, Finland, August 29-September 4,
2001. Latex, 13 pages, 7 figures | null | null | CERN-TH/2001-345, FTUAM 01/22, IFT-UAM/CSIC-01-38, IPPP/01/57,
DCPT/01/112 | hep-ph | null | We study the direct detection of supersymmetric dark matter in the light of
recent experimental results. In particular, we show that regions in the
parameter space of several scenarios with a neutralino-nucleon cross section of
the order of $10^{-6}$ pb, i.e., where current dark matter detectors are
sensitive, can be obtained. These are supergravity scenarios with intermediate
unification scale, and superstring scenarios with D-branes.
| [
{
"created": "Mon, 3 Dec 2001 17:52:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cerdeno",
"D. G.",
""
],
[
"Khalil",
"S.",
""
],
[
"Munoz",
"C.",
""
]
] | We study the direct detection of supersymmetric dark matter in the light of recent experimental results. In particular, we show that regions in the parameter space of several scenarios with a neutralino-nucleon cross section of the order of $10^{-6}$ pb, i.e., where current dark matter detectors are sensitive, can be obtained. These are supergravity scenarios with intermediate unification scale, and superstring scenarios with D-branes. |
0806.2422 | Sugumi Kanno | Sugumi Kanno, Masashi Kimura, Jiro Soda, Shuichiro Yokoyama | Anisotropic Inflation from Vector Impurity | 16 pages, 4 figures, improved section V, to be published in JCAP | JCAP0808:034,2008 | 10.1088/1475-7516/2008/08/034 | null | hep-ph astro-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study an inflationary scenario with a vector impurity. We show that the
universe undergoes anisotropic inflationary expansion due to a preferred
direction determined by the vector. Using the slow-roll approximation, we find
a formula to determine anisotropy of the inflationary universe. We discuss
possible observable predictions of this scenario. In particular, it is stressed
that primordial gravitational waves can be induced from curvature
perturbations. Hence, even in low scale inflation, a sizable amount of
primordial gravitational waves may be produced during inflation.
| [
{
"created": "Sun, 15 Jun 2008 06:42:28 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jun 2008 05:39:47 GMT",
"version": "v2"
},
{
"created": "Fri, 1 Aug 2008 14:05:42 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Kanno",
"Sugumi",
""
],
[
"Kimura",
"Masashi",
""
],
[
"Soda",
"Jiro",
""
],
[
"Yokoyama",
"Shuichiro",
""
]
] | We study an inflationary scenario with a vector impurity. We show that the universe undergoes anisotropic inflationary expansion due to a preferred direction determined by the vector. Using the slow-roll approximation, we find a formula to determine anisotropy of the inflationary universe. We discuss possible observable predictions of this scenario. In particular, it is stressed that primordial gravitational waves can be induced from curvature perturbations. Hence, even in low scale inflation, a sizable amount of primordial gravitational waves may be produced during inflation. |
2006.16220 | Joshua Foster | Christopher Dessert, Joshua W. Foster, Yonatan Kahn, Benjamin R. Safdi | Systematics in the XENON1T data: the 15-keV anti-axion | 9 pages, 7 figures, supplementary code at
https://github.com/joshwfoster/XenonSystematics | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The XENON1T collaboration has found an excess of electron recoil events in
their Science Run 1 data below ~7 keV with a spectral shape consistent with
that expected from a solar-axion-induced signal. The claimed statistical
significance of the solar-axion model over the null hypothesis is 3.5$\sigma$.
In this work we provide evidence for mismodeling in the electron recoil data
that may decrease the local significance of the axion model to as low as $p
\approx 0.1$. To reach this conclusion, we search for a signal with the
spectral template of the solar axion model, but shifted to higher (unphysical)
energies above ~7 keV. We find that the distribution of significances found
from this side-band analysis does not follow the expected chi-square
distribution, which allows us to quantify the extent to which mismodeling may
be affecting the interpretation of the data at energies below ~7 keV. For
example, we find that there is an even higher-significance fit to the data when
the solar axion model is shifted upwards in energy by ~15 keV and allowed to
have a negative normalization.
| [
{
"created": "Mon, 29 Jun 2020 17:39:14 GMT",
"version": "v1"
}
] | 2020-06-30 | [
[
"Dessert",
"Christopher",
""
],
[
"Foster",
"Joshua W.",
""
],
[
"Kahn",
"Yonatan",
""
],
[
"Safdi",
"Benjamin R.",
""
]
] | The XENON1T collaboration has found an excess of electron recoil events in their Science Run 1 data below ~7 keV with a spectral shape consistent with that expected from a solar-axion-induced signal. The claimed statistical significance of the solar-axion model over the null hypothesis is 3.5$\sigma$. In this work we provide evidence for mismodeling in the electron recoil data that may decrease the local significance of the axion model to as low as $p \approx 0.1$. To reach this conclusion, we search for a signal with the spectral template of the solar axion model, but shifted to higher (unphysical) energies above ~7 keV. We find that the distribution of significances found from this side-band analysis does not follow the expected chi-square distribution, which allows us to quantify the extent to which mismodeling may be affecting the interpretation of the data at energies below ~7 keV. For example, we find that there is an even higher-significance fit to the data when the solar axion model is shifted upwards in energy by ~15 keV and allowed to have a negative normalization. |
2104.12230 | Vladimir Baryshevsky | V. G. Baryshevsky, P. I. Porshnev | Predicting outcomes of electric dipole and magnetic moment experiments | null | null | 10.1088/1402-4896/ac50c8 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The anomalous magnetic and electric dipole moments in spin motion equation
acquire pseudoscalar corrections if the $T(CP)$-noninvariance is admitted. It
allows to explain the discrepancy between experimental and theoretical values
of muon $(g-2)$ factor under assumption that the pseudoscalar correction is the
dominant source of this discrepancy.
| [
{
"created": "Sun, 25 Apr 2021 19:04:37 GMT",
"version": "v1"
}
] | 2022-02-23 | [
[
"Baryshevsky",
"V. G.",
""
],
[
"Porshnev",
"P. I.",
""
]
] | The anomalous magnetic and electric dipole moments in spin motion equation acquire pseudoscalar corrections if the $T(CP)$-noninvariance is admitted. It allows to explain the discrepancy between experimental and theoretical values of muon $(g-2)$ factor under assumption that the pseudoscalar correction is the dominant source of this discrepancy. |
1005.1224 | Mikihiko Nakao | Tobias Hurth and Mikihiko Nakao | Radiative and Electroweak Penguin Decays of B Mesons | Invited contribution to the Annual Review of Nuclear and Particle
Science, corrections added based on the published version, 40 pages, 6
figures | Ann.Rev.Nucl.Part.Sci.60:645-677,2010 | 10.1146/annurev.nucl.012809.104424 | MZ-TH/10-07; CERN-PH-TH/2010-068; KEK-PREPRINT-2010-9 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The huge datasets collected at the two B factories, Belle and BaBar, have
made it possible to explore the radiative penguin process b --> s gamma, the
electroweak penguin process b --> s l+ l- and the suppressed radiative process
b --> d gamma in detail, all in exclusive channels and inclusive measurements.
Theoretical tools have also advanced to meet or surpass the experimental
precision, especially in inclusive calculations and the various ratios of
exclusive channels. In this article, we review the theoretical and experimental
progress over the past decade in the radiative and electroweak penguin decays
of B mesons.
| [
{
"created": "Fri, 7 May 2010 14:52:00 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Jan 2011 01:51:31 GMT",
"version": "v2"
}
] | 2011-02-18 | [
[
"Hurth",
"Tobias",
""
],
[
"Nakao",
"Mikihiko",
""
]
] | The huge datasets collected at the two B factories, Belle and BaBar, have made it possible to explore the radiative penguin process b --> s gamma, the electroweak penguin process b --> s l+ l- and the suppressed radiative process b --> d gamma in detail, all in exclusive channels and inclusive measurements. Theoretical tools have also advanced to meet or surpass the experimental precision, especially in inclusive calculations and the various ratios of exclusive channels. In this article, we review the theoretical and experimental progress over the past decade in the radiative and electroweak penguin decays of B mesons. |
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