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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0312306 | Stefan Hesselbach | A. Bartl, H. Fraas, S. Hesselbach, K. Hidaka, T. Kernreiter, O. Kittel
and W. Porod | Impact of CP phases on SUSY particle production and decays | 10 pages, 8 eps figures, LaTeX, uses JHEP3.cls; talk given at the
International Workshop on Astroparticle and High Energy Physics (AHEP),
Valencia, Spain, 14-18 Oct. 2003 | null | null | IFIC/03-59, TGU-33, UWThPh-2003-43, WUE-ITP-2003-026, ZU-TH 21/03 | hep-ph | null | We report on the results of a phenomenological study of top squarks
(stop_{1,2}) and bottom squarks (sbottom_{1,2}) in the Minimal Supersymmetric
Standard Model (MSSM) with complex parameters A_t, A_b, mu and M_1. In
particular we focus on the CP phase dependence of the branching ratios of
stop_{1,2} and sbottom_{1,2} decays. We find that the effect of the phases on
the stop_{1,2} and sbottom_{1,2} decays can be quite significant in a large
region of the MSSM parameter space. We also study a CP asymmetry in sfermion
decays.
| [
{
"created": "Sun, 21 Dec 2003 18:01:19 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bartl",
"A.",
""
],
[
"Fraas",
"H.",
""
],
[
"Hesselbach",
"S.",
""
],
[
"Hidaka",
"K.",
""
],
[
"Kernreiter",
"T.",
""
],
[
"Kittel",
"O.",
""
],
[
"Porod",
"W.",
""
]
] | We report on the results of a phenomenological study of top squarks (stop_{1,2}) and bottom squarks (sbottom_{1,2}) in the Minimal Supersymmetric Standard Model (MSSM) with complex parameters A_t, A_b, mu and M_1. In particular we focus on the CP phase dependence of the branching ratios of stop_{1,2} and sbottom_{1,2} decays. We find that the effect of the phases on the stop_{1,2} and sbottom_{1,2} decays can be quite significant in a large region of the MSSM parameter space. We also study a CP asymmetry in sfermion decays. |
hep-ph/0210101 | Peschanski | J. Lamouroux (DEA, Grenoble University), R. Peschanski (Saclay, Th.),
C. Royon and L. Schoeffel (Saclay, Exp.) | Hard diffraction and the nature of the Pomeron | 14 pages, 9 figures | Nucl.Phys.B649:312-326,2003 | 10.1016/S0550-3213(02)01013-1 | null | hep-ph | null | We ask the question whether the quark and gluon distributions in the Pomeron
obtained from QCD fits to hard diffraction processes at HERA can be dynamically
generated from a state made of ``valence-like'' gluons and sea quarks as input.
By a method combining backward Q^2-evolution for data exploration and forward
Q^2-evolution for a best fit determination, we find that the diffractive
structure functions published by the H1 collaboration at HERA can be described
by a simple ``valence-like'' input at an initial scale of order mu^2 ~ 2.3-2.7
GeV^2. The parton number sum rules at the initial scale mu^2 for the H1 fit
gives 2.1\pm .1\pm .1 and .13\pm .01 \pm .02 for gluon and sea quarks
respectively, corresponding to an initial Pomeron state made of (almost) only
two gluons. It has flat gluon density leading to a plausible interpretation in
terms of a gluonium state.
| [
{
"created": "Mon, 7 Oct 2002 13:22:44 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Lamouroux",
"J.",
"",
"DEA, Grenoble University"
],
[
"Peschanski",
"R.",
"",
"Saclay, Th."
],
[
"Royon",
"C.",
"",
"Saclay, Exp."
],
[
"Schoeffel",
"L.",
"",
"Saclay, Exp."
]
] | We ask the question whether the quark and gluon distributions in the Pomeron obtained from QCD fits to hard diffraction processes at HERA can be dynamically generated from a state made of ``valence-like'' gluons and sea quarks as input. By a method combining backward Q^2-evolution for data exploration and forward Q^2-evolution for a best fit determination, we find that the diffractive structure functions published by the H1 collaboration at HERA can be described by a simple ``valence-like'' input at an initial scale of order mu^2 ~ 2.3-2.7 GeV^2. The parton number sum rules at the initial scale mu^2 for the H1 fit gives 2.1\pm .1\pm .1 and .13\pm .01 \pm .02 for gluon and sea quarks respectively, corresponding to an initial Pomeron state made of (almost) only two gluons. It has flat gluon density leading to a plausible interpretation in terms of a gluonium state. |
2108.01607 | Georg Wolschin | Georg Wolschin | Nonlinear diffusion of gluons | 14 pages, 6 figures; as published in PHYSICA A | Physica A 597 (2022) 127299 | 10.1016/j.physa.2022.127299 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | It is proposed to consider the fast thermalization of gluons in relativistic
heavy-ion collisions as a diffusion process in momentum space. Closed-form
analytical solutions of a nonlinear boson diffusion equation (NBDE) with
constant drift and diffusion coefficients v, D and boundary conditions at the
singularity are derived. The time evolution towards local central temperatures
T< 600 MeV through inelastic gluon scatterings in heavy-ion collisions is
calculated for under- and overoccupied systems in the full momentum range. The
results are consistent with QCD-based numerical calculations for gluon
thermalization via inelastic gluon collisions.
| [
{
"created": "Tue, 3 Aug 2021 16:16:42 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Mar 2022 10:41:50 GMT",
"version": "v2"
}
] | 2022-04-08 | [
[
"Wolschin",
"Georg",
""
]
] | It is proposed to consider the fast thermalization of gluons in relativistic heavy-ion collisions as a diffusion process in momentum space. Closed-form analytical solutions of a nonlinear boson diffusion equation (NBDE) with constant drift and diffusion coefficients v, D and boundary conditions at the singularity are derived. The time evolution towards local central temperatures T< 600 MeV through inelastic gluon scatterings in heavy-ion collisions is calculated for under- and overoccupied systems in the full momentum range. The results are consistent with QCD-based numerical calculations for gluon thermalization via inelastic gluon collisions. |
hep-ph/0004124 | Antonio Delgado | A. Delgado and M. Quiros | The lightest Higgs mass in supersymmetric models with extra dimensions | Latex2e, 11 pages, 1 figure | Phys.Lett.B484:355-361,2000 | 10.1016/S0370-2693(00)00650-X | LPTENS-00/18,IEM-FT-202/00,IFT-UAM/CSIC-00-17 | hep-ph | null | In the four-dimensional supersymmetric standard model extended with gauge
singlets the lightest Higgs boson mass, $M_H$, has an important contribution
proportional to the squared of the superpotential coupling $\lambda$ of
singlets to Higgs fields, $\lambda SH_1\cdot H_2$. The requirement of
perturbativity up to the unification scale yields an upper bound on $M_H\sim
140$ GeV. In extensions to theories with (longitudinal) extra dimensions at the
TeV where such coupling exists and massive Kaluza-Klein states fall into N=2
representations, if either of the Higgs or singlet fields live in the bulk of
the extra dimensions, the $\beta$-function of $\lambda$ is suppressed due to
the absence of anomalous dimension of hypermultiplets to leading order. This
implies a slower running of $\lambda$ and an enhancement of its low energy
value. The $M_H$ upper bound increases to values $M_H\lesssim 165$ GeV.
| [
{
"created": "Thu, 13 Apr 2000 18:28:52 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Delgado",
"A.",
""
],
[
"Quiros",
"M.",
""
]
] | In the four-dimensional supersymmetric standard model extended with gauge singlets the lightest Higgs boson mass, $M_H$, has an important contribution proportional to the squared of the superpotential coupling $\lambda$ of singlets to Higgs fields, $\lambda SH_1\cdot H_2$. The requirement of perturbativity up to the unification scale yields an upper bound on $M_H\sim 140$ GeV. In extensions to theories with (longitudinal) extra dimensions at the TeV where such coupling exists and massive Kaluza-Klein states fall into N=2 representations, if either of the Higgs or singlet fields live in the bulk of the extra dimensions, the $\beta$-function of $\lambda$ is suppressed due to the absence of anomalous dimension of hypermultiplets to leading order. This implies a slower running of $\lambda$ and an enhancement of its low energy value. The $M_H$ upper bound increases to values $M_H\lesssim 165$ GeV. |
1902.10256 | Carlos E. Yaguna | Carlos E. Yaguna | New Constraints on Xenonphobic Dark Matter from DEAP-3600 | 10 pages. V2: matches published version | JCAP04(2019)041 | 10.1088/1475-7516/2019/04/041 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The first-year results from DEAP-3600, a single-phase liquid argon
direct-detection dark matter experiment, were recently reported. At first
sight, they seem to provide no new constraints, as the limit lies well within
the region already excluded by three different xenon experiments: LUX,
PandaX-II, and XENON1T. We point out, however, that this conclusion is not
necessarily true, for it is based on the untested assumption that the dark
matter particle couples equally to protons and neutrons. For the more general
case of isosping-violating dark matter, we find that there are regions in the
parameter space where DEAP-3600 actually provides the most stringent limits on
the dark matter-proton spin-independent cross section. Such regions correspond
to the so-called Xenonphobic dark matter scenario, for which the
neutron-to-proton coupling ratio is close to $-0.7$. Our results seem to signal
the beginning of a new era in which the complementarity among different direct
detection targets will play a crucial role in the determination of the
fundamental properties of the dark matter particle.
| [
{
"created": "Tue, 26 Feb 2019 22:49:22 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Apr 2019 16:36:43 GMT",
"version": "v2"
}
] | 2019-04-30 | [
[
"Yaguna",
"Carlos E.",
""
]
] | The first-year results from DEAP-3600, a single-phase liquid argon direct-detection dark matter experiment, were recently reported. At first sight, they seem to provide no new constraints, as the limit lies well within the region already excluded by three different xenon experiments: LUX, PandaX-II, and XENON1T. We point out, however, that this conclusion is not necessarily true, for it is based on the untested assumption that the dark matter particle couples equally to protons and neutrons. For the more general case of isosping-violating dark matter, we find that there are regions in the parameter space where DEAP-3600 actually provides the most stringent limits on the dark matter-proton spin-independent cross section. Such regions correspond to the so-called Xenonphobic dark matter scenario, for which the neutron-to-proton coupling ratio is close to $-0.7$. Our results seem to signal the beginning of a new era in which the complementarity among different direct detection targets will play a crucial role in the determination of the fundamental properties of the dark matter particle. |
1706.01920 | Anthony Fradette | Anthony Fradette, Maxim Pospelov | BBN for the LHC: constraints on lifetimes of the Higgs portal scalars | 16 pages, 11 figures | Phys. Rev. D 96, 075033 (2017) | 10.1103/PhysRevD.96.075033 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | LHC experiments can provide a remarkable sensitivity to exotic metastable
massive particles, decaying with significant displacement from the interaction
point. The best sensitivity is achieved to models where the production and
decay occur due to different coupling constants, and the lifetime of exotic
particles determines the probability of decay within a detector. The lifetimes
of such particles can be independently limited from standard cosmology, in
particular the Big Bang Nucleosynthesis. In this paper, we analyze the
constraints on the simplest scalar model coupled through the Higgs portal,
where the production occurs via $h\to SS$, and the decay is induced by the
small mixing angle of the Higgs field $h$ and scalar $S$. We find that
throughout the most part of the parameter space, $2 m_\mu < m_S < m_h/2$, the
lifetimes of exotic particle has to be less than 0.1 seconds, while below
$2m_\mu$ it could grow to about a second. The strong constraints on lifetimes
are induced by the nucleonic and mesonic decays of scalars that tend to raise
the $n/p$ ratio. Strong constraints on lifetimes of the minimal singlet
extensions of the Higgs potential is a welcome news for the MATHUSLA proposal
that seeks to detect displaced decays of exotic particles produced in the LHC
collisions. We also point out how more complicated exotic sectors could evade
the BBN lifetime constraints.
| [
{
"created": "Tue, 6 Jun 2017 18:32:57 GMT",
"version": "v1"
}
] | 2017-11-01 | [
[
"Fradette",
"Anthony",
""
],
[
"Pospelov",
"Maxim",
""
]
] | LHC experiments can provide a remarkable sensitivity to exotic metastable massive particles, decaying with significant displacement from the interaction point. The best sensitivity is achieved to models where the production and decay occur due to different coupling constants, and the lifetime of exotic particles determines the probability of decay within a detector. The lifetimes of such particles can be independently limited from standard cosmology, in particular the Big Bang Nucleosynthesis. In this paper, we analyze the constraints on the simplest scalar model coupled through the Higgs portal, where the production occurs via $h\to SS$, and the decay is induced by the small mixing angle of the Higgs field $h$ and scalar $S$. We find that throughout the most part of the parameter space, $2 m_\mu < m_S < m_h/2$, the lifetimes of exotic particle has to be less than 0.1 seconds, while below $2m_\mu$ it could grow to about a second. The strong constraints on lifetimes are induced by the nucleonic and mesonic decays of scalars that tend to raise the $n/p$ ratio. Strong constraints on lifetimes of the minimal singlet extensions of the Higgs potential is a welcome news for the MATHUSLA proposal that seeks to detect displaced decays of exotic particles produced in the LHC collisions. We also point out how more complicated exotic sectors could evade the BBN lifetime constraints. |
1208.1055 | Martin Poghosyan G. | M. G. Poghosyan | Predictions for pp single diffractive cross section at LHC | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A model based on Gribov's Regge calculus was developed [1] and was proposed
to describe diffractive processes. In this note we present numerical vales
obtained from [1] for the dependence of single diffraction cross-section on
diffractive mass at $\sqrt{s}$ = 0.9, 2.76 and 7 TeV.
| [
{
"created": "Sun, 5 Aug 2012 22:00:24 GMT",
"version": "v1"
}
] | 2012-08-07 | [
[
"Poghosyan",
"M. G.",
""
]
] | A model based on Gribov's Regge calculus was developed [1] and was proposed to describe diffractive processes. In this note we present numerical vales obtained from [1] for the dependence of single diffraction cross-section on diffractive mass at $\sqrt{s}$ = 0.9, 2.76 and 7 TeV. |
hep-ph/0703221 | Louis J. Clavelli | L. Clavelli | Phase Transition to Exact Susy | To appear in Proceedings of Susy06, the 14th International Conference
on Supersymmetry and the Unification of Fundamental Interactions, Ed.
Jonathon L. Feng, American Institute of Physics, 2007 | AIPConf.Proc.903:634-637,2007 | 10.1063/1.2735264 | null | hep-ph | null | The anthropic principle is based on the observation that, within narrow
bounds, the laws of physics are such as to have allowed the evolution of life.
The string theoretic approach to understanding this observation is based on the
expectation that the effective potential has an enormous number of local minima
with different particle masses and perhaps totally different fundamental
couplings and space time topology. The vast majority of these alternative
universes are totally inhospitable to life, having, for example, vacuum
energies near the natural (Planck) scale. The statistics, however, are assumed
to be such that a few of these local minima (and not more) have a low enough
vacuum energy and suitable other properties to support life. In the
inflationary era, the "multiverse" made successive transitions between the
available minima until arriving at our current state of low vacuum energy.
String theory, however, also suggests that the absolute minimum of the
effective potential is exactly supersymmetric. Questions then arise as to why
the inflationary era did not end by a transition to one of these, when will the
universe make the phase transition to the exactly supersymmetric ground state,
and what will be the properties of this final state.
| [
{
"created": "Tue, 20 Mar 2007 19:42:24 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Clavelli",
"L.",
""
]
] | The anthropic principle is based on the observation that, within narrow bounds, the laws of physics are such as to have allowed the evolution of life. The string theoretic approach to understanding this observation is based on the expectation that the effective potential has an enormous number of local minima with different particle masses and perhaps totally different fundamental couplings and space time topology. The vast majority of these alternative universes are totally inhospitable to life, having, for example, vacuum energies near the natural (Planck) scale. The statistics, however, are assumed to be such that a few of these local minima (and not more) have a low enough vacuum energy and suitable other properties to support life. In the inflationary era, the "multiverse" made successive transitions between the available minima until arriving at our current state of low vacuum energy. String theory, however, also suggests that the absolute minimum of the effective potential is exactly supersymmetric. Questions then arise as to why the inflationary era did not end by a transition to one of these, when will the universe make the phase transition to the exactly supersymmetric ground state, and what will be the properties of this final state. |
2308.00395 | Mojtaba Hosseini | Mojtaba Hosseini, Seyed Yaser Ayazi, Ahmad Mohamadnejad | Gravitational wave effects and phenomenology of a two-component dark
matter model | 29 pages, 11 figures | Eur.Phys.J.C 84 (2024) 485 | 10.1140/epjc/s10052-024-12769-8 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We study an extension of the Standard Model (SM) which could have two
candidates for dark matter (DM) including a Dirac fermion and a vector dark
matter (VDM) under a new $U(1)$ gauge group in the hidden sector. The model is
classically scale-invariant and the electroweak symmetry breaks because of loop
effects. We investigate the parameter space allowed by current experimental
constraints and phenomenological bounds. We probe the parameter space of the
model in the mass range $1< M_V<5000$ GeV and $1<M_{\psi}<5000$ GeV. It has
been shown that there are many points in this mass range that are in agreement
with all phenomenological constraints. The electroweak phase transition has
been discussed and it has been shown that there is region in the parameter
space of the model consistent with DM relic density and direct detection
constraints that, at the same time, can lead to first order electroweak phase
transition. The gravitational waves produced during the phase transition could
be probed by future space-based interferometers such as LISA and BBO.
| [
{
"created": "Tue, 1 Aug 2023 09:15:56 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Nov 2023 13:58:28 GMT",
"version": "v2"
},
{
"created": "Sat, 11 May 2024 18:08:36 GMT",
"version": "v3"
}
] | 2024-05-14 | [
[
"Hosseini",
"Mojtaba",
""
],
[
"Ayazi",
"Seyed Yaser",
""
],
[
"Mohamadnejad",
"Ahmad",
""
]
] | We study an extension of the Standard Model (SM) which could have two candidates for dark matter (DM) including a Dirac fermion and a vector dark matter (VDM) under a new $U(1)$ gauge group in the hidden sector. The model is classically scale-invariant and the electroweak symmetry breaks because of loop effects. We investigate the parameter space allowed by current experimental constraints and phenomenological bounds. We probe the parameter space of the model in the mass range $1< M_V<5000$ GeV and $1<M_{\psi}<5000$ GeV. It has been shown that there are many points in this mass range that are in agreement with all phenomenological constraints. The electroweak phase transition has been discussed and it has been shown that there is region in the parameter space of the model consistent with DM relic density and direct detection constraints that, at the same time, can lead to first order electroweak phase transition. The gravitational waves produced during the phase transition could be probed by future space-based interferometers such as LISA and BBO. |
2312.01380 | Bartosz Dziewit | Bartosz Dziewit, Joris Vergeest, Marek Zra{\l}ek | Flavor symmetries in the leptonic Yukawa sector of the 3HDM | 7 pages, 0 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | As an extension of the Standard Model (SM), the 3HDM (Three-Higgs-Doublet
Model) defines additional relationships among the fermions. In the visible
leptonic Yukawa sector of a minimal 3HDM, we determine and classify the
existing flavor symmetries under discrete non-abelian groups up to order 1032.
The three Higgs doublets form a flavor triplet, and the admission of unfaithful
representations enriches the set of candidate flavor transformations greatly.
The many existing symmetries give rise (after EWSB) to a large number of
inequivalent mass matrices that imply lepton properties, which in turn are
evaluated against experimental data. In the 3HDM the mass hierarchy of the
charged leptons leads to a too small $\Delta m^2_{21} / \Delta m^2_{32}$ ratio
of the neutrinos. More generally, it is proven that the lepton mass matrices
implied by discrete flavor symmetries are in disagreement with the observed
data for all groups investigated, both when it is assumed that the neutrinos
have the Dirac or Majorana nature.
| [
{
"created": "Sun, 3 Dec 2023 13:01:40 GMT",
"version": "v1"
}
] | 2023-12-05 | [
[
"Dziewit",
"Bartosz",
""
],
[
"Vergeest",
"Joris",
""
],
[
"Zrałek",
"Marek",
""
]
] | As an extension of the Standard Model (SM), the 3HDM (Three-Higgs-Doublet Model) defines additional relationships among the fermions. In the visible leptonic Yukawa sector of a minimal 3HDM, we determine and classify the existing flavor symmetries under discrete non-abelian groups up to order 1032. The three Higgs doublets form a flavor triplet, and the admission of unfaithful representations enriches the set of candidate flavor transformations greatly. The many existing symmetries give rise (after EWSB) to a large number of inequivalent mass matrices that imply lepton properties, which in turn are evaluated against experimental data. In the 3HDM the mass hierarchy of the charged leptons leads to a too small $\Delta m^2_{21} / \Delta m^2_{32}$ ratio of the neutrinos. More generally, it is proven that the lepton mass matrices implied by discrete flavor symmetries are in disagreement with the observed data for all groups investigated, both when it is assumed that the neutrinos have the Dirac or Majorana nature. |
hep-ph/0104210 | Luis Bettencourt | Luis M. A. Bettencourt, Karen Pao and J. G. Sanderson | Dynamical behavior of spatially inhomogeneous relativistic $\lambda
\phi^4$ quantum field theory in the Hartree approximation | 22 pages, 8 figures, uses Revtex | Phys.Rev. D65 (2002) 025015 | 10.1103/PhysRevD.65.025015 | MIT-CTP-3107 | hep-ph | null | We study the dynamics of a spatially inhomogeneous quantum $\lambda \phi^4$
field theory in 1+1 dimensions in the Hartree approximation. In particular, we
investigate the long-time behavior of this approximation in a variety of
controlled situations, both at zero and finite temperature. The observed
behavior is much richer than that in the spatially homogeneous case.
Nevertheless, we show that the fields fail to thermalize in a canonical sense,
as expected from analogous results in closely related (mean field) transport
theory. We argue that this dynamical approximation is best suited as a means to
study the short-time decay of spatially inhomogeneous fields and in the
dynamics of coherent quasi-classical inhomogeneous configurations (e.g.
solitons) in a background of dynamical self-consistent quantum fluctuations.
| [
{
"created": "Sat, 21 Apr 2001 01:01:43 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Bettencourt",
"Luis M. A.",
""
],
[
"Pao",
"Karen",
""
],
[
"Sanderson",
"J. G.",
""
]
] | We study the dynamics of a spatially inhomogeneous quantum $\lambda \phi^4$ field theory in 1+1 dimensions in the Hartree approximation. In particular, we investigate the long-time behavior of this approximation in a variety of controlled situations, both at zero and finite temperature. The observed behavior is much richer than that in the spatially homogeneous case. Nevertheless, we show that the fields fail to thermalize in a canonical sense, as expected from analogous results in closely related (mean field) transport theory. We argue that this dynamical approximation is best suited as a means to study the short-time decay of spatially inhomogeneous fields and in the dynamics of coherent quasi-classical inhomogeneous configurations (e.g. solitons) in a background of dynamical self-consistent quantum fluctuations. |
hep-ph/9903395 | null | Chun Liu | Electroweak Symmetry Breaking due to Confinement | 8 pages, revtex, no figure, the discussion on effective
superpotential refined | Mod.Phys.Lett. A15 (2000) 525-530 | 10.1142/S0217732300000517 | null | hep-ph | null | Within the framework of gauge mediated supersymmetry breaking, we consider an
electroweak symmetry breaking pattern in which there is no conventional $\mu$
term. The pattern is made appealing through realizing it as low energy
effective description of a supersymmetric Yang-Mills theory which is of
confinement. Phenomenological implications are discussed.
| [
{
"created": "Thu, 18 Mar 1999 06:59:17 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Apr 1999 07:07:27 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Liu",
"Chun",
""
]
] | Within the framework of gauge mediated supersymmetry breaking, we consider an electroweak symmetry breaking pattern in which there is no conventional $\mu$ term. The pattern is made appealing through realizing it as low energy effective description of a supersymmetric Yang-Mills theory which is of confinement. Phenomenological implications are discussed. |
1301.0287 | Mart\'in Gonz\'alez-Alonso | Mart\'in Gonz\'alez-Alonso | Probing non-standard charged-current interactions: from cold neutrons to
the LHC | Proceedings of CKM 2012, the 7th International Workshop on the CKM
Unitarity Triangle, University of Cincinnati, USA, 28 September - 2 October
2012 | null | null | NPAC-13-01 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that semileptonic decays of light hadrons and nuclei can be
used not only to determine the CKM element V_ud with high accuracy, but also as
probes of physics beyond the Standard Model. In this talk I review recent works
that studied this within an Effective Field Theory framework, comparing the
sensitivity of different low-energy and LHC observables. A clear
complementarity between low- and high-energy searches it is found.
| [
{
"created": "Wed, 2 Jan 2013 18:25:33 GMT",
"version": "v1"
}
] | 2013-01-03 | [
[
"González-Alonso",
"Martín",
""
]
] | It is well known that semileptonic decays of light hadrons and nuclei can be used not only to determine the CKM element V_ud with high accuracy, but also as probes of physics beyond the Standard Model. In this talk I review recent works that studied this within an Effective Field Theory framework, comparing the sensitivity of different low-energy and LHC observables. A clear complementarity between low- and high-energy searches it is found. |
hep-ph/0512347 | Ying Li | Ying Li, Cai-Dian Lu, Cong-Feng Qiao | Rare decays of B-> J/\psi D^(*) and B->\eta_c D^(*)in pQCD Approach | 10 pages, 1 figure | Phys.Rev.D73:094006,2006 | 10.1103/PhysRevD.73.094006 | null | hep-ph | null | Motivated by the recent measurement of the upper limit of ${B}^0 \to J/\psi
D$ branching ratio, which is important in accounting for the soft $J/\psi$
production in B decays, we investigate ${B}^0 \to J/\psi D^{(\star)}$ and
$\eta_c D^{(\star)}$ decays in perturbative QCD approach based on $k_T$
factorization. Being pure annihilation (W-exchange) decays, these branching
ratios are estimated to be at the order of $10^{-5} \sim 10^{-7}$, which are
just at the corner of being observable at the $B$ factories. The measurements
of these decay channels may help us to understand the QCD dynamics in the
corresponding energy scale, especially the reliability of pQCD approach to
these processes.
| [
{
"created": "Wed, 28 Dec 2005 06:52:20 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Li",
"Ying",
""
],
[
"Lu",
"Cai-Dian",
""
],
[
"Qiao",
"Cong-Feng",
""
]
] | Motivated by the recent measurement of the upper limit of ${B}^0 \to J/\psi D$ branching ratio, which is important in accounting for the soft $J/\psi$ production in B decays, we investigate ${B}^0 \to J/\psi D^{(\star)}$ and $\eta_c D^{(\star)}$ decays in perturbative QCD approach based on $k_T$ factorization. Being pure annihilation (W-exchange) decays, these branching ratios are estimated to be at the order of $10^{-5} \sim 10^{-7}$, which are just at the corner of being observable at the $B$ factories. The measurements of these decay channels may help us to understand the QCD dynamics in the corresponding energy scale, especially the reliability of pQCD approach to these processes. |
hep-ph/9908299 | Javier Rico | Fernando Cornet (Univ. Granada, Spain), Monica Relano (IAC, La Laguna,
Spain), Javier Rico (ETH-Zurich, Switzerland) | Four Fermion Contact Terms in Charged Current Processes and Large Extra
Dimensions | 11 pages, Latex. Some references added | Phys.Rev.D61:037701,2000 | 10.1103/PhysRevD.61.037701 | UG-FT-101/99 | hep-ph | null | We study the bounds that can be obtained on four-fermion contact terms from
the experimental data for (e+ p -> \bar{nu} X) obtained at HERA and (p \bar{p}
-> e \nu), measured at TEVATRON. We compare these bounds with the ones
available in the literature. Finally, we apply these results to study the
compactification radius in theories with large extra dimensions and we obtain
the bound M_c >= 3.3 TeV.
| [
{
"created": "Mon, 9 Aug 1999 00:14:59 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Sep 1999 08:50:15 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Cornet",
"Fernando",
"",
"Univ. Granada, Spain"
],
[
"Relano",
"Monica",
"",
"IAC, La Laguna,\n Spain"
],
[
"Rico",
"Javier",
"",
"ETH-Zurich, Switzerland"
]
] | We study the bounds that can be obtained on four-fermion contact terms from the experimental data for (e+ p -> \bar{nu} X) obtained at HERA and (p \bar{p} -> e \nu), measured at TEVATRON. We compare these bounds with the ones available in the literature. Finally, we apply these results to study the compactification radius in theories with large extra dimensions and we obtain the bound M_c >= 3.3 TeV. |
2209.14219 | Georgi Dvali | Gia Dvali | Strong-$CP$ with and without gravity | 18 pages | null | null | null | hep-ph gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Conventionally, the strong-$CP$ problem is assumed to be a naturalness
puzzle, with the axion solution sometimes viewed as an ad hoc fix. Gravity is
either ignored or taken as a threat for the global Peccei-Quinn symmetry. We
explain that the situation is fundamentally different. In gravity, axion is a
matter of consistency imposed by the $S$-matrix: Each gauge sector must include
axion with exact relaxation of the corresponding $\bar{\theta}$. We show that
this favors an alternative and remarkably simple formulation of the axion,
fully fixed by the gauge redundancy of QCD, without involvement of a global
symmetry. The axion mechanism is a Higgs effect for the QCD $3$-form, ensuring
that physics is independent of $\bar{\theta}$ to all orders in operator
expansion. A near-future experimental detection of the neutron EDM will be an
unambiguous signal of $CP$-violating physics beyond the Standard Model. The
axion coupling is tied to the scale of gravity.
| [
{
"created": "Wed, 28 Sep 2022 16:46:23 GMT",
"version": "v1"
}
] | 2022-09-29 | [
[
"Dvali",
"Gia",
""
]
] | Conventionally, the strong-$CP$ problem is assumed to be a naturalness puzzle, with the axion solution sometimes viewed as an ad hoc fix. Gravity is either ignored or taken as a threat for the global Peccei-Quinn symmetry. We explain that the situation is fundamentally different. In gravity, axion is a matter of consistency imposed by the $S$-matrix: Each gauge sector must include axion with exact relaxation of the corresponding $\bar{\theta}$. We show that this favors an alternative and remarkably simple formulation of the axion, fully fixed by the gauge redundancy of QCD, without involvement of a global symmetry. The axion mechanism is a Higgs effect for the QCD $3$-form, ensuring that physics is independent of $\bar{\theta}$ to all orders in operator expansion. A near-future experimental detection of the neutron EDM will be an unambiguous signal of $CP$-violating physics beyond the Standard Model. The axion coupling is tied to the scale of gravity. |
hep-ph/9511383 | Marcello Lissia | Suzhou Huang and Marcello Lissia | The Dimensionally Reduced Effective Theory for Quarks in High
Temperature QCD | 29 pages, RevTeX 3.0, plus 7 figures (postscript). This is the
revised version that will appear in Nuclear Physics B; modifications to the
original version leave results unchanged and mostly better clarify
motivations and strategy | Nucl.Phys.B480:623-654,1996 | 10.1016/S0550-3213(96)00463-4 | MIT-CTP#2361 and INFNCA-TH-94-25 | hep-ph hep-lat nucl-th | null | We show that QCD undergoes dimensional reduction at high temperatures also in
the quark sector. In the kinematic region relevant to screening physics, where
the lowest Matsubara modes are close to their ``mass-shells'', all static
Green's functions involving both quarks and gluons, are reproducible in the
high-$T$ limit by a renormalizable three dimensional Lagrangian up to order
$\tilde{g}^2(T)\sim 1/ln T$. This three dimensional theory only contains
explicitly the lightest bosonic and fermionic Matsubara modes, while the
heavier modes correct the tree-level couplings and generate extra local
vertices. We also find that the quark degrees of freedom that have been
retained in the reduced theory are nonrelativistic in the high-$T$ limit. We
then improve our result to order $\tilde{g}^4(T)$ through an explicit
nonrelativistic expansion, in the spirit of the heavy quark effective theory.
This effective theory is relevant for studying QCD screening phenomena with
observables made from quarks, e.g. mesonic and baryonic currents, already at
temperatures not much higher than the chiral transition temperature $T_c$.
| [
{
"created": "Tue, 21 Nov 1995 15:24:20 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Sep 1996 14:49:39 GMT",
"version": "v2"
}
] | 2011-01-04 | [
[
"Huang",
"Suzhou",
""
],
[
"Lissia",
"Marcello",
""
]
] | We show that QCD undergoes dimensional reduction at high temperatures also in the quark sector. In the kinematic region relevant to screening physics, where the lowest Matsubara modes are close to their ``mass-shells'', all static Green's functions involving both quarks and gluons, are reproducible in the high-$T$ limit by a renormalizable three dimensional Lagrangian up to order $\tilde{g}^2(T)\sim 1/ln T$. This three dimensional theory only contains explicitly the lightest bosonic and fermionic Matsubara modes, while the heavier modes correct the tree-level couplings and generate extra local vertices. We also find that the quark degrees of freedom that have been retained in the reduced theory are nonrelativistic in the high-$T$ limit. We then improve our result to order $\tilde{g}^4(T)$ through an explicit nonrelativistic expansion, in the spirit of the heavy quark effective theory. This effective theory is relevant for studying QCD screening phenomena with observables made from quarks, e.g. mesonic and baryonic currents, already at temperatures not much higher than the chiral transition temperature $T_c$. |
1304.1184 | Joachim Kopp | Joachim Kopp (MPIK Heidelberg) | Constraints on dark matter annihilation from AMS-02 results | 6 pages, 2 figures, v2: improved treatment of astrophysical
uncertainties, improved discussion, matches published version | Phys. Rev. D 88, 076013 (2013) | 10.1103/PhysRevD.88.076013 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use recently released data on the positron-to-electron ratio in cosmic
rays from the AMS-02 experiment to constrain dark matter annihilation in the
Milky Way. Due to the yet unexplained positron excess, limits are generally
weaker than those obtained using other probes, especially gamma rays. This also
means that explaining the positron excess in terms of dark matter annihilation
is difficult. Only if very conservative assumptions on the dark matter
distribution in the Galactic Center region are adopted, it may be possible to
accommodate dark matter annihilating to leptons with a cross section above
10^-24 cm^3/sec. We comment on several theoretical mechanisms to explain such
large annihilation cross sections.
| [
{
"created": "Wed, 3 Apr 2013 20:55:25 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Oct 2013 14:52:56 GMT",
"version": "v2"
}
] | 2013-10-31 | [
[
"Kopp",
"Joachim",
"",
"MPIK Heidelberg"
]
] | We use recently released data on the positron-to-electron ratio in cosmic rays from the AMS-02 experiment to constrain dark matter annihilation in the Milky Way. Due to the yet unexplained positron excess, limits are generally weaker than those obtained using other probes, especially gamma rays. This also means that explaining the positron excess in terms of dark matter annihilation is difficult. Only if very conservative assumptions on the dark matter distribution in the Galactic Center region are adopted, it may be possible to accommodate dark matter annihilating to leptons with a cross section above 10^-24 cm^3/sec. We comment on several theoretical mechanisms to explain such large annihilation cross sections. |
hep-ph/0307171 | Enrico Lunghi | Andri Hardmeier, Enrico Lunghi, Dan Pirjol, Daniel Wyler | Subleading collinear operators and their matrix elements | 28 pages, 1 figure, axodraw.sty required, few typos corrected | Nucl.Phys. B682 (2004) 150-182 | 10.1016/j.nuclphysb.2004.01.022 | ZU-TH 07/03 | hep-ph | null | We discuss the most general form of the leading power suppressed collinear
operators in the soft-collinear effective theory. Such operators appear in the
description of power corrections to exclusive heavy flavor decays into
energetic light hadrons. Reparametrization invariance in the SCET provides
powerful constraints on the Wilson coefficients of the subleading collinear
operators. We present explicit results for the matrix elements of these
operators on pseudoscalar and vector mesons, which are expressed in terms of
twist-2 and twist-3 light-cone wave functions. We consistently include the
effects of three-particle light-cone distribution amplitudes and find that
their impact could be of phenomenological relevance.
| [
{
"created": "Sun, 13 Jul 2003 20:44:34 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Aug 2003 10:04:05 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Jun 2006 21:17:45 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Hardmeier",
"Andri",
""
],
[
"Lunghi",
"Enrico",
""
],
[
"Pirjol",
"Dan",
""
],
[
"Wyler",
"Daniel",
""
]
] | We discuss the most general form of the leading power suppressed collinear operators in the soft-collinear effective theory. Such operators appear in the description of power corrections to exclusive heavy flavor decays into energetic light hadrons. Reparametrization invariance in the SCET provides powerful constraints on the Wilson coefficients of the subleading collinear operators. We present explicit results for the matrix elements of these operators on pseudoscalar and vector mesons, which are expressed in terms of twist-2 and twist-3 light-cone wave functions. We consistently include the effects of three-particle light-cone distribution amplitudes and find that their impact could be of phenomenological relevance. |
1904.05359 | Haolin Li | Hao-Lin Li, Ling-Xiao Xu, Jiang-Hao Yu, Shou-Hua Zhu | EFTs meet Higgs Nonlinearity, Compositeness and (Neutral) Naturalness | 46 pages, 12 figures, 10 tables | null | 10.1007/JHEP09(2019)010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Composite Higgs and neutral-naturalness models are popular scenarios in which
the Higgs boson is a pseudo Nambu-Goldstone boson, and naturalness problem is
addressed by composite top partners. Since the standard model effective field
theory (SMEFT) with dimension-six operators cannot fully retain the information
of Higgs nonlinearity due to its PNGB nature, we systematically construct low
energy Lagrangian in which the information of compositeness and Higgs
nonlinearity are encoded in the form factors, the two-point functions in the
top sector. We classify naturalness conditions in various scenarios, and first
present these form factors in composite neutral naturalness models. After
extracting out Higgs effective couplings from these form factors and performing
the global fit, we find the value of Higgs top coupling could still be larger
than the standard model one if the top quark is embedded in the higher
dimensional representations. Also we find the impact of Higgs nonlinearity is
enhanced by the large mass splitting between composite states. In this case,
pattern of the correlation between the $t\bar{t}h$ and $t\bar{t}hh$ couplings
is quite different for the linear and nonlinear Higgs descriptions.
| [
{
"created": "Wed, 10 Apr 2019 18:00:01 GMT",
"version": "v1"
},
{
"created": "Wed, 22 May 2019 03:57:46 GMT",
"version": "v2"
}
] | 2019-10-02 | [
[
"Li",
"Hao-Lin",
""
],
[
"Xu",
"Ling-Xiao",
""
],
[
"Yu",
"Jiang-Hao",
""
],
[
"Zhu",
"Shou-Hua",
""
]
] | Composite Higgs and neutral-naturalness models are popular scenarios in which the Higgs boson is a pseudo Nambu-Goldstone boson, and naturalness problem is addressed by composite top partners. Since the standard model effective field theory (SMEFT) with dimension-six operators cannot fully retain the information of Higgs nonlinearity due to its PNGB nature, we systematically construct low energy Lagrangian in which the information of compositeness and Higgs nonlinearity are encoded in the form factors, the two-point functions in the top sector. We classify naturalness conditions in various scenarios, and first present these form factors in composite neutral naturalness models. After extracting out Higgs effective couplings from these form factors and performing the global fit, we find the value of Higgs top coupling could still be larger than the standard model one if the top quark is embedded in the higher dimensional representations. Also we find the impact of Higgs nonlinearity is enhanced by the large mass splitting between composite states. In this case, pattern of the correlation between the $t\bar{t}h$ and $t\bar{t}hh$ couplings is quite different for the linear and nonlinear Higgs descriptions. |
0710.4528 | Joern Kersten | Joern Kersten, Kai Schmidt-Hoberg | The Gravitino-Stau Scenario after Catalyzed BBN | 1+14 pages, 6 figures; v2: minor clarifications, 1 reference added,
matches version to appear in JCAP | JCAP 0801:011,2008 | 10.1088/1475-7516/2008/01/011 | TUM-HEP 679/07 | hep-ph | null | We consider the impact of Catalyzed Big Bang Nucleosynthesis on theories with
a gravitino LSP and a charged slepton NLSP. In models where the gravitino to
gaugino mass ratio is bounded from below, such as gaugino-mediated SUSY
breaking, we derive a lower bound on the gaugino mass parameter m_1/2. As a
concrete example, we determine the parameter space of gaugino mediation that is
compatible with all cosmological constraints.
| [
{
"created": "Wed, 24 Oct 2007 18:30:28 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Dec 2007 14:21:15 GMT",
"version": "v2"
}
] | 2009-01-06 | [
[
"Kersten",
"Joern",
""
],
[
"Schmidt-Hoberg",
"Kai",
""
]
] | We consider the impact of Catalyzed Big Bang Nucleosynthesis on theories with a gravitino LSP and a charged slepton NLSP. In models where the gravitino to gaugino mass ratio is bounded from below, such as gaugino-mediated SUSY breaking, we derive a lower bound on the gaugino mass parameter m_1/2. As a concrete example, we determine the parameter space of gaugino mediation that is compatible with all cosmological constraints. |
0804.4571 | Mina Ketan Parida | M. K. Parida (NISER, Bhubaneswar) | Intermediate left-right gauge symmetry, unification of couplings and
fermion masses in SUSY $SO(10)\times S_4$ | Minor clarification and few references added to match the published
version | Phys.Rev.D78:053004,2008 | 10.1103/PhysRevD.78.053004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If left-right gauge theory occurs as an intermediate symmetry in a GUT then,
apart from other advantages, it is possible to obtain the see-saw scale
necessary to understand small neutrino masses with Majorana coupling of order
unity. Barring threshold or non-renormalizable gravitational effects, or
assumed presence of additional light scalar particles of unprescribed origin,
all other attempts to achieve manifest one-loop gauge coupling unification in
SUSY SO(10) with left-right intermediate symmetry have not been successful so
far. Attributing this failure to lack of flavor symmetry in the GUT, we show
how the spontaneous symmetry breaking of $SO(10)\times S_4$ leads to such
intermediate scale extending over a wide range, $M_R \simeq 5\times 10^{9}$ GeV
to $10^{15}$ GeV. All the charged fermion masses are fitted at the see-saw
scale, $M_N\simeq M_R \simeq 4 \times 10^{13}$ GeV which is obtained with
Majorana coupling $f_0 \simeq 1$. Using a constrained parametrization in which
CP-violation originates only from quark sector, besides other predictions made
in the neutrino sector, the reactor mixing angle is found to be $\theta_{13}
\simeq 3^{\circ} - 5^{\circ}$ which is in the range accessible to ongoing and
planned experiments. The leptonic Dirac phase turns out to be $\delta \sim 2.9-
3.1$ radians with Jarlskog invariant $J \sim 2.95 \times 10^{-5} - 10^{-3}$.
| [
{
"created": "Tue, 29 Apr 2008 12:42:26 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Sep 2008 12:32:33 GMT",
"version": "v2"
}
] | 2009-01-09 | [
[
"Parida",
"M. K.",
"",
"NISER, Bhubaneswar"
]
] | If left-right gauge theory occurs as an intermediate symmetry in a GUT then, apart from other advantages, it is possible to obtain the see-saw scale necessary to understand small neutrino masses with Majorana coupling of order unity. Barring threshold or non-renormalizable gravitational effects, or assumed presence of additional light scalar particles of unprescribed origin, all other attempts to achieve manifest one-loop gauge coupling unification in SUSY SO(10) with left-right intermediate symmetry have not been successful so far. Attributing this failure to lack of flavor symmetry in the GUT, we show how the spontaneous symmetry breaking of $SO(10)\times S_4$ leads to such intermediate scale extending over a wide range, $M_R \simeq 5\times 10^{9}$ GeV to $10^{15}$ GeV. All the charged fermion masses are fitted at the see-saw scale, $M_N\simeq M_R \simeq 4 \times 10^{13}$ GeV which is obtained with Majorana coupling $f_0 \simeq 1$. Using a constrained parametrization in which CP-violation originates only from quark sector, besides other predictions made in the neutrino sector, the reactor mixing angle is found to be $\theta_{13} \simeq 3^{\circ} - 5^{\circ}$ which is in the range accessible to ongoing and planned experiments. The leptonic Dirac phase turns out to be $\delta \sim 2.9- 3.1$ radians with Jarlskog invariant $J \sim 2.95 \times 10^{-5} - 10^{-3}$. |
hep-ph/0205100 | Anirban Kundu | Anirban Kundu (Jadavpur U.) | B decays and Supersymmetry | LaTex file of working group talk presented at WHEPP-7, HRI,
Allahabad, Jan. 2002 | Pramana 60:345-352,2003 | 10.1007/BF02706413 | null | hep-ph | null | I discuss how supersymmetry affects various observables in B decays, and
point out the interesting channels in the context of B factories.
| [
{
"created": "Fri, 10 May 2002 12:15:10 GMT",
"version": "v1"
}
] | 2010-11-23 | [
[
"Kundu",
"Anirban",
"",
"Jadavpur U."
]
] | I discuss how supersymmetry affects various observables in B decays, and point out the interesting channels in the context of B factories. |
hep-ph/9910258 | Burkert | Volker D. Burkert (Jefferson Laboratory) | Probing the structure of Nucleons in Electromagbetic Interactions | 9 pages, 6 figures, plenary talk at PANIC99 | Nucl.Phys. A663 (2000) 29-37 | 10.1016/S0375-9474(99)00569-2 | null | hep-ph | null | Open problems in the study of the nucleon structure using electromagnetic
probes are discussed. The focus is on experimental aspects in the regime of
strong interaction QCD. Significant progress in our understanding of the
nucleon structure in this domain of QCD may be expected in the first decade of
the next millenium. This is due to major experimental and theoretical efforts
currently underway in this field.
| [
{
"created": "Wed, 6 Oct 1999 22:50:14 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Burkert",
"Volker D.",
"",
"Jefferson Laboratory"
]
] | Open problems in the study of the nucleon structure using electromagnetic probes are discussed. The focus is on experimental aspects in the regime of strong interaction QCD. Significant progress in our understanding of the nucleon structure in this domain of QCD may be expected in the first decade of the next millenium. This is due to major experimental and theoretical efforts currently underway in this field. |
hep-ph/0510096 | Yogiro Hama | Yogiro Hama, Rone P.G. Andrade, Frederique Grassi, Otavio Socolowski
Jr, Takeshi Kodama, and Bernardo Tavares, S. S. Padula | 3D Relativistic Hydrodynamic Computations Using Lattice-QCD-Inspired
Equations of State | 10 pages, 16 figures, prepared for Quark Matter 2005 Conference | Nucl.Phys. A774 (2006) 169-178 | 10.1016/j.nuclphysa.2006.06.024 | null | hep-ph | null | In this communication, we report results of three-dimensional hydrodynamic
computations, by using equations of state with a critical end point as
suggested by the lattice QCD. Some of the results are an increase of the
multiplicity in the mid-rapidity region and a larger elliptic-flow parameter
v2. We discuss also the effcts of the initial-condition fluctuations and the
continuous emission.
| [
{
"created": "Fri, 7 Oct 2005 15:30:04 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Oct 2005 17:47:17 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Nov 2005 14:16:08 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Hama",
"Yogiro",
""
],
[
"Andrade",
"Rone P. G.",
""
],
[
"Grassi",
"Frederique",
""
],
[
"Socolowski",
"Otavio",
"Jr"
],
[
"Kodama",
"Takeshi",
""
],
[
"Tavares",
"Bernardo",
""
],
[
"Padula",
"S. S.",
""... | In this communication, we report results of three-dimensional hydrodynamic computations, by using equations of state with a critical end point as suggested by the lattice QCD. Some of the results are an increase of the multiplicity in the mid-rapidity region and a larger elliptic-flow parameter v2. We discuss also the effcts of the initial-condition fluctuations and the continuous emission. |
hep-ph/9706488 | Dey Mira | Jishnu Dey, Mira Dey, T. Frederico, Lauro Tomio | Scaling Law for Baryon Coupling to its Current and its possible
applications | 10 pages, 2 figures, 1 tex picture and 1 ps picture | Mod.Phys.Lett. A12 (1997) 2193-2202 | 10.1142/S0217732397002247 | null | hep-ph | null | The baryon- coupling to its current ($\lambda_{B}$), in conventional QCD sum
rule calculations (QCDSR), is shown to scale as the cubic power of the baryon
mass, $M_B$. Some theoretical justification for it comes from a simple
light-cone model and also general scaling arguments for QCD. But more
importantly, taken as a phenomenological ansatz for the present, this may find
very good use in current explorations of possible applications of QCDSR to
baryon physics both at temperature $T = 0$, $T \ne 0$ and/or density $\rho =
0$, $\rho \ne 0$.
| [
{
"created": "Tue, 24 Jun 1997 15:52:40 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Dey",
"Jishnu",
""
],
[
"Dey",
"Mira",
""
],
[
"Frederico",
"T.",
""
],
[
"Tomio",
"Lauro",
""
]
] | The baryon- coupling to its current ($\lambda_{B}$), in conventional QCD sum rule calculations (QCDSR), is shown to scale as the cubic power of the baryon mass, $M_B$. Some theoretical justification for it comes from a simple light-cone model and also general scaling arguments for QCD. But more importantly, taken as a phenomenological ansatz for the present, this may find very good use in current explorations of possible applications of QCDSR to baryon physics both at temperature $T = 0$, $T \ne 0$ and/or density $\rho = 0$, $\rho \ne 0$. |
1803.08517 | Jacobo Ruiz de Elvira | A. G\'omez Nicola and J. Ruiz de Elvira | Chiral and $U(1)_A$ restoration for the scalar/pseudoscalar meson nonets | 28 pages and 16 figures | Phys. Rev. D 98, 014020 (2018) | 10.1103/PhysRevD.98.014020 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the restoration pattern of the members of the scalar and
pseudoscalar meson nonets under chiral $O(4)$ and $U(1)_A$ symmetries. For that
purpose, we exploit QCD Ward Identities (WI), which allow one to relate
susceptibilities with quark condensates, as well as susceptibility differences
with meson vertices. In addition, we consider the low-energy realization of QCD
provided by $U(3)$ Chiral Perturbation Theory (ChPT) at finite temperature to
perform a full analysis of the different correlators involved. Our analysis
suggests $U(1)_A$ partner restoration if chiral symmetry partners are also
degenerated. This is also confirmed by the ChPT analysis when the light chiral
limit is reached. Partner degeneration for the $I=1/2$ sector, the behavior of
$I=0$ mixing and the temperature scaling of meson masses predicted by WI are
also studied. Special attention is paid to the connection of our results with
recent lattice analyses.
| [
{
"created": "Thu, 22 Mar 2018 18:00:18 GMT",
"version": "v1"
}
] | 2018-07-25 | [
[
"Nicola",
"A. Gómez",
""
],
[
"de Elvira",
"J. Ruiz",
""
]
] | We analyze the restoration pattern of the members of the scalar and pseudoscalar meson nonets under chiral $O(4)$ and $U(1)_A$ symmetries. For that purpose, we exploit QCD Ward Identities (WI), which allow one to relate susceptibilities with quark condensates, as well as susceptibility differences with meson vertices. In addition, we consider the low-energy realization of QCD provided by $U(3)$ Chiral Perturbation Theory (ChPT) at finite temperature to perform a full analysis of the different correlators involved. Our analysis suggests $U(1)_A$ partner restoration if chiral symmetry partners are also degenerated. This is also confirmed by the ChPT analysis when the light chiral limit is reached. Partner degeneration for the $I=1/2$ sector, the behavior of $I=0$ mixing and the temperature scaling of meson masses predicted by WI are also studied. Special attention is paid to the connection of our results with recent lattice analyses. |
2404.18358 | Ying Zhang | Ying Zhang | CP violation in the CKM mixing for degenerate quark masses | 9 pages | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | CP violation in the CKM mixing is discussed for the case of quark mass
degeneracy that is approximate in the quark mass hierarchy limit. Differing
from the traditional understanding of CP vanishing for degenerate masses, we
find degenerate symmetry plays a non-trivial role in CP violation. The minimal
flavor structure model is reviewed to demonstrate the role of degenerate
symmetry in quark flavor mixing, particularly in CP violation. This relation
between mass hierarchy and CP violation helps us understand the origin of CP
violation and assists the construction of the flavor model.
| [
{
"created": "Mon, 29 Apr 2024 01:37:15 GMT",
"version": "v1"
}
] | 2024-04-30 | [
[
"Zhang",
"Ying",
""
]
] | CP violation in the CKM mixing is discussed for the case of quark mass degeneracy that is approximate in the quark mass hierarchy limit. Differing from the traditional understanding of CP vanishing for degenerate masses, we find degenerate symmetry plays a non-trivial role in CP violation. The minimal flavor structure model is reviewed to demonstrate the role of degenerate symmetry in quark flavor mixing, particularly in CP violation. This relation between mass hierarchy and CP violation helps us understand the origin of CP violation and assists the construction of the flavor model. |
hep-ph/0411050 | Bennie F. L. Ward | B.F.L. Ward (Department Department of Physics, Baylor University,
Waco, Texas, USA) | Quantum Corrections to Newton's Law in Resummed Quantum Gravity | 4 pages, 1 figure; presented by B.F.L. Ward at DPF2004 | Int.J.Mod.Phys. A20 (2005) 3502-3506 | 10.1142/S0217751X05026832 | BU-HEPP-04-10 | hep-ph | null | We present the elements of resummed quantum gravity, a new approach to
quantum gravity based on the work of Feynman using the simplest example of a
scalar field as the representative matter. We show that we get a UV finite
quantum correction to Newton's law.
| [
{
"created": "Wed, 3 Nov 2004 15:42:14 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Ward",
"B. F. L.",
"",
"Department Department of Physics, Baylor University,\n Waco, Texas, USA"
]
] | We present the elements of resummed quantum gravity, a new approach to quantum gravity based on the work of Feynman using the simplest example of a scalar field as the representative matter. We show that we get a UV finite quantum correction to Newton's law. |
2111.07427 | Piotr Korcyl | Piotr Korcyl | Finite volume effects in the McLerran-Venugopalan initial condition for
the JIMWLK equation | 8 pages, 7 figures | null | 10.1140/epjc/s10052-022-10310-3 | null | hep-ph | http://creativecommons.org/licenses/by-sa/4.0/ | We revisit the numerical construction of the initial condition for the dipole
amplitude from the McLerran-Venugopalan model in the context of the JIMWLK
evolution equation. We observe large finite volume effects induced by the
Poisson equation formulated on a torus. We show that the situation can be
partially cured by introducing an infrared regularization. We propose a
procedure that has negligible finite volume corrections. The control of the
finite volume and finite lattice spacings effects is crucial when considering
the numerical solutions of the JIMWLK evolution equation with the collinear
improvement.
| [
{
"created": "Sun, 14 Nov 2021 19:30:20 GMT",
"version": "v1"
}
] | 2022-05-11 | [
[
"Korcyl",
"Piotr",
""
]
] | We revisit the numerical construction of the initial condition for the dipole amplitude from the McLerran-Venugopalan model in the context of the JIMWLK evolution equation. We observe large finite volume effects induced by the Poisson equation formulated on a torus. We show that the situation can be partially cured by introducing an infrared regularization. We propose a procedure that has negligible finite volume corrections. The control of the finite volume and finite lattice spacings effects is crucial when considering the numerical solutions of the JIMWLK evolution equation with the collinear improvement. |
0905.2139 | Kaminski Robert | R. Kaminski, R. Garcia-Martin, J.R. Pelaez, F.J. Yndurain | Once and twice subtracted dispersion relations in the analysis of pi pi
amplitudes | 6 pages, to appear in proceedings of ExcitedQCD 09 workshop, 8-14
February 2009, Zakopane (Poland) | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Once and twice subtracted crossing symmetric dispersion relations applied to
$\pi\pi \to \pi\pi$ scattering data are analyzed and compared. Both sets of
dispersion relations can be used to test the $\pi\pi$ amplitudes in low partial
waves up to about 1 GeV. We show how once subtracted dispersion relations can
provide stronger constraints for $\pi\pi$ amplitudes than twice subtracted ones
in the 400 to 1100 MeV range, given the same experimental input.
| [
{
"created": "Wed, 13 May 2009 16:24:25 GMT",
"version": "v1"
}
] | 2009-05-14 | [
[
"Kaminski",
"R.",
""
],
[
"Garcia-Martin",
"R.",
""
],
[
"Pelaez",
"J. R.",
""
],
[
"Yndurain",
"F. J.",
""
]
] | Once and twice subtracted crossing symmetric dispersion relations applied to $\pi\pi \to \pi\pi$ scattering data are analyzed and compared. Both sets of dispersion relations can be used to test the $\pi\pi$ amplitudes in low partial waves up to about 1 GeV. We show how once subtracted dispersion relations can provide stronger constraints for $\pi\pi$ amplitudes than twice subtracted ones in the 400 to 1100 MeV range, given the same experimental input. |
2011.13619 | Wei Chao | Wei Chao, JIan-guo Jiang and Min Su | Probing Bottom-flavored Scalar Dark Matters at Loop Level | 23 pages, 10 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we consider loop corrections to the spin-independent
WIMP-nucleon scattering cross section in bottom-quark flavored scalar-type dark
matter models. We focus on two scenarios: (a) a complex scalar dark matter with
a scalar particle as the mediator; and (b) a real scalar dark matter with a
vector boson as the mediator. In both scenarios, the direct detection cross
sections are either spin-dependent or kinematically forbidden at the
tree-level. Corrections induced by the WIMP-gluon effective operator,
scalar-type WIMP-quark effective operator, and the twist-2 effective operator
are calculated. Numerical results show that loop induced spin-independent
WIMP-nucleon scattering cross sections are quite considerable in both
scenarios.
| [
{
"created": "Fri, 27 Nov 2020 09:21:10 GMT",
"version": "v1"
}
] | 2020-11-30 | [
[
"Chao",
"Wei",
""
],
[
"Jiang",
"JIan-guo",
""
],
[
"Su",
"Min",
""
]
] | In this paper we consider loop corrections to the spin-independent WIMP-nucleon scattering cross section in bottom-quark flavored scalar-type dark matter models. We focus on two scenarios: (a) a complex scalar dark matter with a scalar particle as the mediator; and (b) a real scalar dark matter with a vector boson as the mediator. In both scenarios, the direct detection cross sections are either spin-dependent or kinematically forbidden at the tree-level. Corrections induced by the WIMP-gluon effective operator, scalar-type WIMP-quark effective operator, and the twist-2 effective operator are calculated. Numerical results show that loop induced spin-independent WIMP-nucleon scattering cross sections are quite considerable in both scenarios. |
hep-ph/0610149 | Ahmed Ali | Ahmed Ali, Alexander Parkhomenko | $ B \to (\rho, \omega)\gamma$ Decays and CKM Phenomenology | 15 pages, 3 figures; presented by Alexander Parkhomenko at the 14th
International Seminar on High Energy Physics: Quarks-2006, St. Petersburg,
Russian Federation, 19 - 25 May, 2006 (to appear in the proceedings) | null | null | DESY 06-187 | hep-ph | null | We review and update the branching ratios for the $B \to (\rho,\omega)
\gamma$ decays, calculated in the QCD factorization approach in the
next-to-leading order (NLO) in the strong coupling $\alpha_s$ and to leading
power in $\Lambda_{\rm QCD}/m_b$. The corrections take into account the vertex,
hard-spectator and annihilation contributions and are found to be large.
Theoretical expectations for the branching ratios, CP-asymmetry, isospin- and
$SU (3)_{\rm F}$-violating ratios in the $B \to \rho\gamma$ and $B \to
\omega\gamma$ decays are presented and compared with the available data.
| [
{
"created": "Thu, 12 Oct 2006 10:43:03 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ali",
"Ahmed",
""
],
[
"Parkhomenko",
"Alexander",
""
]
] | We review and update the branching ratios for the $B \to (\rho,\omega) \gamma$ decays, calculated in the QCD factorization approach in the next-to-leading order (NLO) in the strong coupling $\alpha_s$ and to leading power in $\Lambda_{\rm QCD}/m_b$. The corrections take into account the vertex, hard-spectator and annihilation contributions and are found to be large. Theoretical expectations for the branching ratios, CP-asymmetry, isospin- and $SU (3)_{\rm F}$-violating ratios in the $B \to \rho\gamma$ and $B \to \omega\gamma$ decays are presented and compared with the available data. |
2306.00189 | Giancarlo Rossi | Giancarlo Rossi | A road to an elementary particle physics model with no Higgs -- II | 33 pages, 7 figures | null | null | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | This is the second of two companion papers in which we continue developing
the construction of an elementary particle model with no Higgs. Here we show
that the recently identified non-perturbative field-theoretical feature,
alternative to the Higgs mechanism and capable of giving masses to quarks,
Tera-quarks and $W$, can also provide mass to leptons and Tera-leptons when the
model is extended to include, besides strong, Tera-strong and weak
interactions, also hypercharge. In the present approach elementary fermion
masses are not free parameters but are determined by the dynamics of the
theory. We derive parametric formulae for elementary particle masses from which
we can ``predict'' the order of magnitude of the scale of the new
Tera-interaction and get crude numerical estimates for mass ratios in fair
agreement with phenomenology. The interest of considering elementary particle
models endowed with this kind of non-perturbative mass generation mechanism is
that they allow solving some of the conceptual problems of the present
formulation of the Standard Model, namely origin of the electroweak scale and
naturalness.
| [
{
"created": "Wed, 31 May 2023 21:10:50 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Nov 2023 14:19:48 GMT",
"version": "v2"
}
] | 2023-11-07 | [
[
"Rossi",
"Giancarlo",
""
]
] | This is the second of two companion papers in which we continue developing the construction of an elementary particle model with no Higgs. Here we show that the recently identified non-perturbative field-theoretical feature, alternative to the Higgs mechanism and capable of giving masses to quarks, Tera-quarks and $W$, can also provide mass to leptons and Tera-leptons when the model is extended to include, besides strong, Tera-strong and weak interactions, also hypercharge. In the present approach elementary fermion masses are not free parameters but are determined by the dynamics of the theory. We derive parametric formulae for elementary particle masses from which we can ``predict'' the order of magnitude of the scale of the new Tera-interaction and get crude numerical estimates for mass ratios in fair agreement with phenomenology. The interest of considering elementary particle models endowed with this kind of non-perturbative mass generation mechanism is that they allow solving some of the conceptual problems of the present formulation of the Standard Model, namely origin of the electroweak scale and naturalness. |
2103.02569 | Alexandros Karam Dr. | Alexandros Karam, Tommi Markkanen, Luca Marzola, Sami Nurmi, Martti
Raidal, Arttu Rajantie | Higgs-like spectator field as the origin of structure | Figures modified, analysis extended, references added, matches
published version | null | 10.1140/epjc/s10052-021-09417-w | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We show that the observed primordial perturbations can be entirely sourced by
a light spectator scalar field with a quartic potential, akin to the Higgs
boson, provided that the field is sufficiently displaced from vacuum during
inflation. The framework relies on the indirect modulation of reheating, which
is implemented without any direct coupling between the spectator field and the
inflaton and does not require non-renormalisable interactions. The scenario
gives rise to local non-Gaussianity with $f_{\rm NL}\simeq 5$ as the typical
signal. As an example model where the indirect modulation mechanism is realised
for the Higgs boson, we study the Standard Model extended with right-handed
neutrinos. For the Standard Model running we find, however, that the scenario
analysed does not seem to produce the observed perturbation.
| [
{
"created": "Wed, 3 Mar 2021 18:10:56 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Sep 2021 14:01:26 GMT",
"version": "v2"
}
] | 2021-09-29 | [
[
"Karam",
"Alexandros",
""
],
[
"Markkanen",
"Tommi",
""
],
[
"Marzola",
"Luca",
""
],
[
"Nurmi",
"Sami",
""
],
[
"Raidal",
"Martti",
""
],
[
"Rajantie",
"Arttu",
""
]
] | We show that the observed primordial perturbations can be entirely sourced by a light spectator scalar field with a quartic potential, akin to the Higgs boson, provided that the field is sufficiently displaced from vacuum during inflation. The framework relies on the indirect modulation of reheating, which is implemented without any direct coupling between the spectator field and the inflaton and does not require non-renormalisable interactions. The scenario gives rise to local non-Gaussianity with $f_{\rm NL}\simeq 5$ as the typical signal. As an example model where the indirect modulation mechanism is realised for the Higgs boson, we study the Standard Model extended with right-handed neutrinos. For the Standard Model running we find, however, that the scenario analysed does not seem to produce the observed perturbation. |
1004.5444 | Wenyu Wang | Wen-Yu Wang, Yue-Liang Wu, Fang Ye | Heavy Quark Expansion in 1/\hat{m}_Q and |V_{cb}| Extraction | 21 pages, 11 figures | J.Phys.G38:045004,2011 | 10.1088/0954-3899/38/4/045004 | null | hep-ph | http://creativecommons.org/licenses/by/3.0/ | The dressed heavy quark mass \hat{m}_Q=m_Q+\bar{{\Lambda}} with
\bar{{\Lambda}} being the binding energy is introduced to characterize the
heavy hadrons containing a single heavy quark. A heavy quark expansion in terms
of the inverse of the dressed heavy quark mass 1/\hat{m}_Q is presented with a
complete decomposition of the full field and integrating out the small
components. The heavy quark-antiquark coupling effects are included in the
finite mass corrections. It is shown that the 1/\hat{m}_Q expansion is more
favorable in application. The extraction of |V_{cb}| from exclusive B decays is
studied by using such a new expansion approach.
| [
{
"created": "Fri, 30 Apr 2010 03:28:11 GMT",
"version": "v1"
}
] | 2011-03-18 | [
[
"Wang",
"Wen-Yu",
""
],
[
"Wu",
"Yue-Liang",
""
],
[
"Ye",
"Fang",
""
]
] | The dressed heavy quark mass \hat{m}_Q=m_Q+\bar{{\Lambda}} with \bar{{\Lambda}} being the binding energy is introduced to characterize the heavy hadrons containing a single heavy quark. A heavy quark expansion in terms of the inverse of the dressed heavy quark mass 1/\hat{m}_Q is presented with a complete decomposition of the full field and integrating out the small components. The heavy quark-antiquark coupling effects are included in the finite mass corrections. It is shown that the 1/\hat{m}_Q expansion is more favorable in application. The extraction of |V_{cb}| from exclusive B decays is studied by using such a new expansion approach. |
1309.7259 | Francisco Campanario | Francisco Campanario, Nicolas Kaiser, Dieter Zeppenfeld | W γ production in vector boson fusion at NLO in QCD | 5 pages, 5 figures | Phys. Rev. D 89, 014009 (2014) | 10.1103/PhysRevD.89.014009 | FTUV-13-0930, IFIC/13-67, KA-TP-27-2013, LPN13-063, SFB/CPP-13-70 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The next-to-leading order QCD corrections to W gamma production in
association with two jets via vector boson fusion are calculated, including the
leptonic decay of the W with full off-shell effects and spin correlations. The
process lends itself to a test of quartic gauge couplings. The next-to-leading
order corrections reduce the scale uncertainty significantly and show a
non-trivial phase space dependence.
| [
{
"created": "Fri, 27 Sep 2013 15:02:17 GMT",
"version": "v1"
}
] | 2014-01-15 | [
[
"Campanario",
"Francisco",
""
],
[
"Kaiser",
"Nicolas",
""
],
[
"Zeppenfeld",
"Dieter",
""
]
] | The next-to-leading order QCD corrections to W gamma production in association with two jets via vector boson fusion are calculated, including the leptonic decay of the W with full off-shell effects and spin correlations. The process lends itself to a test of quartic gauge couplings. The next-to-leading order corrections reduce the scale uncertainty significantly and show a non-trivial phase space dependence. |
hep-ph/0412328 | Kim Maltman | K. Maltman | Constituent quark models and pentaquark baryons | 4 pages. Prepared for the Proceedings of the 1st APS Topical Group on
Hadronic Physics (GHP) meeting, FNAL, Oct. 24-26, 2004 | J.Phys.Conf.Ser. 9 (2005) 205-208 | 10.1088/1742-6596/9/1/037 | null | hep-ph | null | We discuss certain general features of the pentaquark picture for the theta,
its 10bar_F partner, Xi_{3/2}, and possible heavy quark analogues. Models
employing spin-dependent interactions based on either effective Goldstone boson
exchange or effective color magnetic exchange are also used to shed light on
possible corrections to the Jaffe-Wilczek and Karliner-Lipkin scenarios. Some
model-dependent features of the pentaquark picture (splitting patterns and
relative decay couplings) are also discussed in the context of these models.
| [
{
"created": "Wed, 22 Dec 2004 04:05:39 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Maltman",
"K.",
""
]
] | We discuss certain general features of the pentaquark picture for the theta, its 10bar_F partner, Xi_{3/2}, and possible heavy quark analogues. Models employing spin-dependent interactions based on either effective Goldstone boson exchange or effective color magnetic exchange are also used to shed light on possible corrections to the Jaffe-Wilczek and Karliner-Lipkin scenarios. Some model-dependent features of the pentaquark picture (splitting patterns and relative decay couplings) are also discussed in the context of these models. |
2104.00046 | Tania Robens | Tania Robens, Jan Kalinowski, Aleksander Filip Zarnecki, Andreas
Papaefstathiou | Extended scalar sectors at future colliders | 20 pages, 8 figures; Presented at XXVII Cracow EPIPHANY Conference of
Future of particle physics | null | 10.5506/APhysPolB.52.1055 | RBI-ThPhys-2021-14 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | After the discovery of the Higgs boson in 2012, particle physics has entered
an exciting era. An important question is whether the Standard Model of
particle physics correctly describes the scalar sector realized by nature, or
whether it is part of a more extended model, featuring additional particle
content. A prime way to test this is to probe models with extended scalar
sectors at future collider facilities. We here discuss such models in the
context of high-luminosity LHC, a possible proton-proton collider with 27 and
100 TeV center-of-mass energy, as well as future lepton colliders with various
center-of-mass energies.
| [
{
"created": "Wed, 31 Mar 2021 18:15:24 GMT",
"version": "v1"
}
] | 2021-08-04 | [
[
"Robens",
"Tania",
""
],
[
"Kalinowski",
"Jan",
""
],
[
"Zarnecki",
"Aleksander Filip",
""
],
[
"Papaefstathiou",
"Andreas",
""
]
] | After the discovery of the Higgs boson in 2012, particle physics has entered an exciting era. An important question is whether the Standard Model of particle physics correctly describes the scalar sector realized by nature, or whether it is part of a more extended model, featuring additional particle content. A prime way to test this is to probe models with extended scalar sectors at future collider facilities. We here discuss such models in the context of high-luminosity LHC, a possible proton-proton collider with 27 and 100 TeV center-of-mass energy, as well as future lepton colliders with various center-of-mass energies. |
hep-ph/9709499 | John Collins | John C. Collins (Penn State) | Proof of Factorization for Diffractive Hard Scattering | Revtex, 12 pages, 8 figures. Two figures corrected | Phys.Rev.D57:3051-3056,1998; Erratum-ibid.D61:019902,2000 | 10.1103/PhysRevD.57.3051 10.1103/PhysRevD.61.019902 | PSU/TH/189 | hep-ph | null | A proof is given that hard-scattering factorization is valid for
deep-inelastic processes which are diffractive or which have some other
condition imposed on the final state in the target fragmentation region.
| [
{
"created": "Mon, 29 Sep 1997 20:28:43 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Sep 1999 19:07:22 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Collins",
"John C.",
"",
"Penn State"
]
] | A proof is given that hard-scattering factorization is valid for deep-inelastic processes which are diffractive or which have some other condition imposed on the final state in the target fragmentation region. |
1106.5894 | Georgi Dvali | Gia Dvali, Cesar Gomez and Slava Mukhanov | Black Hole Masses are Quantized | 23 pages, Latex | null | null | null | hep-ph gr-qc hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a simple argument showing that in any sensible quantum field theory
the masses of black holes cannot assume continuous values and must be
quantized. Our proof solely relies on Poincare-invariance of the asymptotic
background, and is insensitive to geometric characteristics of black holes or
other peculiarities of the short distance physics. Therefore, our results are
equally-applicable to any other localized objects on asymptotically
Poincare-invariant space, such as classicalons. By adding a requirement that in
large mass limit the quantization must approximately account for classical
results, we derive an universal quantization rule applicable to all
classicalons (including black holes) in arbitrary number of dimensions. In
particular, this implies, that black holes cannot emit/absorb arbitrarily soft
quanta. The effect has phenomenological model-independent implications for
black holes and other classicalons that may be created at LHC. We predict, that
contrary to naive intuition, the black holes and/or classicalons, will be
produced in form of fully-fledged quantum resonances of discrete masses, with
the level-spacing controlled by the inverse square-root of cross-section.
| [
{
"created": "Wed, 29 Jun 2011 10:04:39 GMT",
"version": "v1"
}
] | 2011-07-07 | [
[
"Dvali",
"Gia",
""
],
[
"Gomez",
"Cesar",
""
],
[
"Mukhanov",
"Slava",
""
]
] | We give a simple argument showing that in any sensible quantum field theory the masses of black holes cannot assume continuous values and must be quantized. Our proof solely relies on Poincare-invariance of the asymptotic background, and is insensitive to geometric characteristics of black holes or other peculiarities of the short distance physics. Therefore, our results are equally-applicable to any other localized objects on asymptotically Poincare-invariant space, such as classicalons. By adding a requirement that in large mass limit the quantization must approximately account for classical results, we derive an universal quantization rule applicable to all classicalons (including black holes) in arbitrary number of dimensions. In particular, this implies, that black holes cannot emit/absorb arbitrarily soft quanta. The effect has phenomenological model-independent implications for black holes and other classicalons that may be created at LHC. We predict, that contrary to naive intuition, the black holes and/or classicalons, will be produced in form of fully-fledged quantum resonances of discrete masses, with the level-spacing controlled by the inverse square-root of cross-section. |
1404.3050 | Vladimir Korotkikh | V. L. Korotkikh, E. E. Zabrodin | Parton-medium cross section and average QGP viscosity in lead-lead
collisions at LHC | 12 pages, 1 figure. arXiv admin note: text overlap with
arXiv:1204.1409 by other authors | null | 10.1088/0954-3899/42/11/115102 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent experimental CMS and E-by-E ATLAS data on the elliptic anisotropy
of particles in \PbPb collisions are used to extract parton medium
cross-section and the quark-gluon plasma viscosity-to-entropy ratio within the
incomplete equilibration medium model. Our method assumes extrapolation of the
measured pseudorapidity spectrum of charged particles to low-$p_T$ range. Then
the rapidity distribution of both charged and neutral hadrons is restored. The
extracted value of the parton-medium cross section is found to be $\ds \sigma =
(3.1 \pm 0.2) {\rm mb}$. It yields $\eta/s = 0.17 \pm 0.02$ for the ratio of
shear viscosity to entropy density in QGP phase. The last result is in a good
agreement with the estimates obtained by calculations within the viscous
hydrodynamics.
| [
{
"created": "Fri, 11 Apr 2014 09:39:00 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Apr 2015 17:10:40 GMT",
"version": "v2"
}
] | 2015-10-28 | [
[
"Korotkikh",
"V. L.",
""
],
[
"Zabrodin",
"E. E.",
""
]
] | The recent experimental CMS and E-by-E ATLAS data on the elliptic anisotropy of particles in \PbPb collisions are used to extract parton medium cross-section and the quark-gluon plasma viscosity-to-entropy ratio within the incomplete equilibration medium model. Our method assumes extrapolation of the measured pseudorapidity spectrum of charged particles to low-$p_T$ range. Then the rapidity distribution of both charged and neutral hadrons is restored. The extracted value of the parton-medium cross section is found to be $\ds \sigma = (3.1 \pm 0.2) {\rm mb}$. It yields $\eta/s = 0.17 \pm 0.02$ for the ratio of shear viscosity to entropy density in QGP phase. The last result is in a good agreement with the estimates obtained by calculations within the viscous hydrodynamics. |
1004.2497 | Oscar Cata | Luigi Cappiello, Oscar Cata and Giancarlo D'Ambrosio | Antisymmetric tensors in holographic approaches to QCD | 15 pages, 2 figures. Minor changes to match the journal version | Phys.Rev.D82:095008,2010 | 10.1103/PhysRevD.82.095008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study real (massive) antisymmetric tensors of rank two in holographic
models of QCD based on the gauge/string duality. Our aim is to understand in
detail how the AdS/CFT correspondence describes correlators with tensor
currents in QCD. To this end we study a set of bootstrapped correlators with
spin-1 vector and tensor currents, imposing matching to QCD at the partonic
level. We show that a consistent description of this set of correlators yields
a very predictive picture. For instance, it imposes strong constraints on
infrared boundary conditions and precludes the introduction of dilatonic
backgrounds as a mechanism to achieve linear confinement. Additionally,
correlators with tensor currents turn out to be especially sensitive to chiral
symmetry breaking, thus offering an ideal testing ground for genuine QCD
effects. Several phenomenological consequences are explored, such as the
nontrivial interplay between $1^{+-}$ states and conventional $1^{--}$ vector
mesons.
| [
{
"created": "Wed, 14 Apr 2010 20:09:51 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Dec 2010 09:52:16 GMT",
"version": "v2"
}
] | 2010-12-23 | [
[
"Cappiello",
"Luigi",
""
],
[
"Cata",
"Oscar",
""
],
[
"D'Ambrosio",
"Giancarlo",
""
]
] | We study real (massive) antisymmetric tensors of rank two in holographic models of QCD based on the gauge/string duality. Our aim is to understand in detail how the AdS/CFT correspondence describes correlators with tensor currents in QCD. To this end we study a set of bootstrapped correlators with spin-1 vector and tensor currents, imposing matching to QCD at the partonic level. We show that a consistent description of this set of correlators yields a very predictive picture. For instance, it imposes strong constraints on infrared boundary conditions and precludes the introduction of dilatonic backgrounds as a mechanism to achieve linear confinement. Additionally, correlators with tensor currents turn out to be especially sensitive to chiral symmetry breaking, thus offering an ideal testing ground for genuine QCD effects. Several phenomenological consequences are explored, such as the nontrivial interplay between $1^{+-}$ states and conventional $1^{--}$ vector mesons. |
2404.00089 | Nikolaos Kidonakis | Nikolaos Kidonakis and Alberto Tonero | N$^3$LO soft-gluon corrections in single-particle-inclusive kinematics
and $H^+ H^-$ production | 19 pages, 5 figures, 2 tables; v2 has some additional material and it
is the published version | JHEP 06, 138 (2024) | 10.1007/JHEP06(2024)138 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the complete soft-gluon corrections for the production of
colorless final states through N$^3$LO in single-particle-inclusive kinematics.
We present explicit analytical results and use them to study higher-order QCD
corrections for the production of a heavy charged Higgs pair ($H^+ H^-$) via
quark-antiquark annihilation in the Two-Higgs-Doublet Model at LHC energies. We
calculate the NNLO soft-gluon and virtual QCD corrections as well as the
N$^3$LO soft-gluon corrections to the total cross section and the charged-Higgs
rapidity distribution. This is the first calculation of complete N$^3$LO
soft-gluon corrections for a process in single-particle-inclusive kinematics,
and the results can be applied to other processes with colorless final states.
| [
{
"created": "Fri, 29 Mar 2024 18:00:01 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Jun 2024 20:24:57 GMT",
"version": "v2"
}
] | 2024-06-25 | [
[
"Kidonakis",
"Nikolaos",
""
],
[
"Tonero",
"Alberto",
""
]
] | We calculate the complete soft-gluon corrections for the production of colorless final states through N$^3$LO in single-particle-inclusive kinematics. We present explicit analytical results and use them to study higher-order QCD corrections for the production of a heavy charged Higgs pair ($H^+ H^-$) via quark-antiquark annihilation in the Two-Higgs-Doublet Model at LHC energies. We calculate the NNLO soft-gluon and virtual QCD corrections as well as the N$^3$LO soft-gluon corrections to the total cross section and the charged-Higgs rapidity distribution. This is the first calculation of complete N$^3$LO soft-gluon corrections for a process in single-particle-inclusive kinematics, and the results can be applied to other processes with colorless final states. |
hep-ph/0010002 | Nikolaos Kidonakis | Nikolaos Kidonakis | High-order corrections and subleading logarithms for top quark
production | 32 pages LaTeX, 7 figures; a lot of new material has been added,
including an expanded discussion in section 3.3 on resummation prescriptions,
and a new appendix; to appear in Phys. Rev. D | Phys.Rev. D64 (2001) 014009 | 10.1103/PhysRevD.64.014009 | FSU-HEP-20000920 | hep-ph hep-ex | null | We derive high-order threshold corrections for top quark production in
hadronic collisions from resummation calculations. We present analytical
expressions for the cross section through
next-to-next-to-next-to-next-to-leading order (N^4LO) and
next-to-next-to-leading logarithmic accuracy. Special attention is paid to the
role of subleading logarithms and how they relate to the convergence of the
perturbation series and differences between various resummation prescriptions.
It is shown that care must be taken to avoid unphysical terms in the
expansions. Numerical results are presented for top quark production at the
Tevatron. We find sizeable increases to the total cross section and
differential distributions and a dramatic reduction of the factorization scale
dependence relative to next-to-leading order.
| [
{
"created": "Sat, 30 Sep 2000 21:49:37 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Mar 2001 20:48:54 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Kidonakis",
"Nikolaos",
""
]
] | We derive high-order threshold corrections for top quark production in hadronic collisions from resummation calculations. We present analytical expressions for the cross section through next-to-next-to-next-to-next-to-leading order (N^4LO) and next-to-next-to-leading logarithmic accuracy. Special attention is paid to the role of subleading logarithms and how they relate to the convergence of the perturbation series and differences between various resummation prescriptions. It is shown that care must be taken to avoid unphysical terms in the expansions. Numerical results are presented for top quark production at the Tevatron. We find sizeable increases to the total cross section and differential distributions and a dramatic reduction of the factorization scale dependence relative to next-to-leading order. |
hep-ph/0408083 | Saurabh D. Rindani | Saurabh D. Rindani | Transverse beam polarization and limits on leptoquark couplings in e+e-
--> t tbar | 13 pages latex, with 6 figures included. Revised version corrects
minor error. Latest version corrects minor errors, to appear in Phys. Lett. B | Phys.Lett. B602 (2004) 97-104 | 10.1016/j.physletb.2004.09.068 | null | hep-ph | null | It is shown that if electron and positron beams at a linear collider are
transversely polarized, azimuthal asymmetries of the final-state top quark in
e+e- --> t tbar can be used to probe a combination of couplings of left and
right chiralities in a scalar leptoquark model. The CP-conserving azimuthal
asymmetry would be a sensitive test of the chirality violating couplings. A
linear collider operating at sqrt{s}=500 GeV and having transverse
polarizations of 80% and 60% respectively for the e- and e+ beams, can put a
limit of the order of 0.025 on the product of the left and right chirality
leptoquark couplings (in units of the electromagnetic coupling constant), with
a leptoquark mass of 1 TeV and for an integrated luminosity of 500 inverse fb.
The CP-violating azimuthal asymmetry, which would provide a direct test of
CP-violating phases in leptoquark couplings, can be constrained to the same
level of accuracy. However, this limit is uninteresting in view of the much
better indirect limit from the electric dipole moment of the electron.
| [
{
"created": "Fri, 6 Aug 2004 07:24:57 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Aug 2004 08:16:02 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Oct 2004 08:29:13 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Rindani",
"Saurabh D.",
""
]
] | It is shown that if electron and positron beams at a linear collider are transversely polarized, azimuthal asymmetries of the final-state top quark in e+e- --> t tbar can be used to probe a combination of couplings of left and right chiralities in a scalar leptoquark model. The CP-conserving azimuthal asymmetry would be a sensitive test of the chirality violating couplings. A linear collider operating at sqrt{s}=500 GeV and having transverse polarizations of 80% and 60% respectively for the e- and e+ beams, can put a limit of the order of 0.025 on the product of the left and right chirality leptoquark couplings (in units of the electromagnetic coupling constant), with a leptoquark mass of 1 TeV and for an integrated luminosity of 500 inverse fb. The CP-violating azimuthal asymmetry, which would provide a direct test of CP-violating phases in leptoquark couplings, can be constrained to the same level of accuracy. However, this limit is uninteresting in view of the much better indirect limit from the electric dipole moment of the electron. |
2003.09985 | Meshkat Rajaee | Majid Bahraminasr, Pouya Bakhti and Meshkat Rajaee | Sensitivities to secret neutrino interaction at FASER$\nu$ | 14 pages, 5 figures | null | 10.1088/1361-6471/ac11c2 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the impact of the coupling of neutrinos with a new light neutral
gauge boson, $Z^\prime$, with a mass of less than 500 {\rm MeV} in FASER$\nu$
experiment. Scenarios in which a light gauge boson is coupled to neutrinos are
motivated within numerous contexts which are designed to explain various
anomalies in particle physics and cosmology. This interaction leads to a new
decay mode for charged mesons to a light lepton plus neutrino and $Z^{\prime}$,
($\pi^+(K^+)\to e^+ \nu Z^\prime$) followed by the subsequent decay of
$Z^\prime$ into the pair of neutrino and anti-neutrino, ($Z^\prime \to
\nu\bar{\nu}$). FASER$\nu$, the Forward Search Experiment at the LHC, has the
potential to detect collider neutrinos for the first time. In particular, the
FASER$\nu$ emulsion detector will provide the opportunity to detect
$\tau$-neutrinos and to measure their energies. Using this ability of
FASER$\nu$ emulsion detector, we investigate the potential of FASER$\nu$
experiment and the proposed upgraded version of this experiment, FASER2$\nu$,
to constrain the coupling of a neutrino with the light gauge boson.
| [
{
"created": "Sun, 22 Mar 2020 20:17:52 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Jun 2021 04:49:12 GMT",
"version": "v2"
}
] | 2021-09-01 | [
[
"Bahraminasr",
"Majid",
""
],
[
"Bakhti",
"Pouya",
""
],
[
"Rajaee",
"Meshkat",
""
]
] | We study the impact of the coupling of neutrinos with a new light neutral gauge boson, $Z^\prime$, with a mass of less than 500 {\rm MeV} in FASER$\nu$ experiment. Scenarios in which a light gauge boson is coupled to neutrinos are motivated within numerous contexts which are designed to explain various anomalies in particle physics and cosmology. This interaction leads to a new decay mode for charged mesons to a light lepton plus neutrino and $Z^{\prime}$, ($\pi^+(K^+)\to e^+ \nu Z^\prime$) followed by the subsequent decay of $Z^\prime$ into the pair of neutrino and anti-neutrino, ($Z^\prime \to \nu\bar{\nu}$). FASER$\nu$, the Forward Search Experiment at the LHC, has the potential to detect collider neutrinos for the first time. In particular, the FASER$\nu$ emulsion detector will provide the opportunity to detect $\tau$-neutrinos and to measure their energies. Using this ability of FASER$\nu$ emulsion detector, we investigate the potential of FASER$\nu$ experiment and the proposed upgraded version of this experiment, FASER2$\nu$, to constrain the coupling of a neutrino with the light gauge boson. |
1011.1439 | Baris Altunkaynak | Baris Altunkaynak, Brent D. Nelson, Lisa L. Everett, Yongyan Rao, and
Ian-Woo Kim | Landscape of Supersymmetric Particle Mass Hierarchies in Deflected
Mirage Mediation | 33 pages, 23 figures | Eur. Phys. J. Plus 127 (2012) 2 | 10.1140/epjp/i2012-12002-6 | MADPH-10-1564; MCTP-10-51 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With the aim of uncovering viable regions of parameter space in deflected
mirage mediation (DMM) models of supersymmetry breaking, we study the landscape
of particle mass hierarchies for the lightest four non-Standard Model states
for DMM models and compare the results to that of minimal
supergravity/constrained MSSM (mSUGRA/CMSSM) models, building on previous
studies of Feldman, Liu, and Nath. Deflected mirage mediation is a
string-motivated scenario in which the soft terms include comparable
contributions from gravity mediation, gauge mediation, and anomaly mediation.
DMM allows a wide variety of phenomenologically preferred models with light
charginos and neutralinos, including novel patterns in which the heavy Higgs
particles are lighter than the lightest superpartner. We use this analysis to
motivate two DMM benchmark points to be used for more detailed collider
studies. One model point has a higgsino-dominated lightest superpartner and a
compressed yet heavy spectrum, while the other has a stau NLSP and similar
features to mSUGRA/CMSSM models, but with a slightly less stretched spectrum.
| [
{
"created": "Fri, 5 Nov 2010 15:59:31 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Nov 2011 22:25:38 GMT",
"version": "v2"
}
] | 2012-01-26 | [
[
"Altunkaynak",
"Baris",
""
],
[
"Nelson",
"Brent D.",
""
],
[
"Everett",
"Lisa L.",
""
],
[
"Rao",
"Yongyan",
""
],
[
"Kim",
"Ian-Woo",
""
]
] | With the aim of uncovering viable regions of parameter space in deflected mirage mediation (DMM) models of supersymmetry breaking, we study the landscape of particle mass hierarchies for the lightest four non-Standard Model states for DMM models and compare the results to that of minimal supergravity/constrained MSSM (mSUGRA/CMSSM) models, building on previous studies of Feldman, Liu, and Nath. Deflected mirage mediation is a string-motivated scenario in which the soft terms include comparable contributions from gravity mediation, gauge mediation, and anomaly mediation. DMM allows a wide variety of phenomenologically preferred models with light charginos and neutralinos, including novel patterns in which the heavy Higgs particles are lighter than the lightest superpartner. We use this analysis to motivate two DMM benchmark points to be used for more detailed collider studies. One model point has a higgsino-dominated lightest superpartner and a compressed yet heavy spectrum, while the other has a stau NLSP and similar features to mSUGRA/CMSSM models, but with a slightly less stretched spectrum. |
0907.3496 | Andrew Spray | Maxim Perelstein and Andrew Spray | Tensor Reggeons from Warped Space at the LHC | 28 pages, 4 figures; Added References, expanded section 2.2,
corrected typos, replaced figures | JHEP 0910:096,2009 | 10.1088/1126-6708/2009/10/096 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The hierarchy problem can be addressed by extending the four-dimensional
space-time to include an extra compact spatial dimension with non-trivial
"warped" metric, as first suggested by Randall and Sundrum. If the
Randall-Sundrum framework is realized in string theory, the effective value of
the string scale in the vicinity of the infrared boundary should be in the TeV
domain. The most attractive models of this type embed the Standard Model
particles as zero-modes of five-dimensional fields. In such models, Regge
excitations of the Standard Model states should appear around the TeV scale. We
construct a toy model that describes tensor (spin-2) excitations of the
Standard Model gauge bosons, and their on-shell couplings with light matter and
gauge fields, within this framework. We use this toy model to predict the
phenomenologically important features of the tensor Regge gluon, such as its
mass, production cross section at the LHC, and decay patterns.
| [
{
"created": "Mon, 20 Jul 2009 21:24:45 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Aug 2009 20:33:53 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Oct 2009 20:36:03 GMT",
"version": "v3"
}
] | 2009-11-13 | [
[
"Perelstein",
"Maxim",
""
],
[
"Spray",
"Andrew",
""
]
] | The hierarchy problem can be addressed by extending the four-dimensional space-time to include an extra compact spatial dimension with non-trivial "warped" metric, as first suggested by Randall and Sundrum. If the Randall-Sundrum framework is realized in string theory, the effective value of the string scale in the vicinity of the infrared boundary should be in the TeV domain. The most attractive models of this type embed the Standard Model particles as zero-modes of five-dimensional fields. In such models, Regge excitations of the Standard Model states should appear around the TeV scale. We construct a toy model that describes tensor (spin-2) excitations of the Standard Model gauge bosons, and their on-shell couplings with light matter and gauge fields, within this framework. We use this toy model to predict the phenomenologically important features of the tensor Regge gluon, such as its mass, production cross section at the LHC, and decay patterns. |
hep-ph/9509215 | Renard Fernand Michel | F.M. Renard | Residual New Physics Effects in $e^+e^-$ and $\gamma\gamma$ Collisions | 19 pages + 5 figures in ps file. (renard@lpmsun2.lpm.univ-montp2.fr) | null | null | PM/95-31 | hep-ph | null | We present a set of studies concerning the description of New Physics (NP)
effects caracterized by a scale much higher than the electroweak scale. We show
that both present experimental results and several types of theretical
considerations about the Standard Model (SM) and NP suggest a hierarchy among
the sectors in which NP manifestations should appear. We concentrate on
residual effects described by effective lagrangians involving bosonic and/or
heavy quark fields. For each operator we propose an unambiguous definition of
the NP scale given by the energy at which unitarity is saturated. We also
consider the possible existence of Higher Vector Bosons.
We then study the tests realizable at present and future colliders. We start
from the analysis of the high precision tests at Z peak, discussing separately
the constraints obtained from the light fermionic sector and those due to the
$b\bar b$ sector. We then consider the process $e^+e^-\to f\bar f$ at higher
energies (LEP2 and NLC) and we propose the "Z peak subtracted representation"
which allows to automatically take into account Z peak constraints and to
describe several types of NP effects at any other energy. Applications to
various NP effects (Higher Vector Bosons, Technicolour resonances, Anomalous
Gauge Boson couplings) are given. We then concentrate on several bosonic
processes, $e^+e^-\to W^+W^-$, $HZ$, $H\gamma$, and $\gamma\gamma$ collisions
producing boson pairs or a single Higgs. We study the sensitivities to the
various operators involved in the effective lagrangian and we propose ways to
disentangle them. The NP scales which can be felt vary from a few TeV at LEP2
up to 200 TeV in single H production at NLC.
| [
{
"created": "Mon, 4 Sep 1995 10:45:22 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Renard",
"F. M.",
""
]
] | We present a set of studies concerning the description of New Physics (NP) effects caracterized by a scale much higher than the electroweak scale. We show that both present experimental results and several types of theretical considerations about the Standard Model (SM) and NP suggest a hierarchy among the sectors in which NP manifestations should appear. We concentrate on residual effects described by effective lagrangians involving bosonic and/or heavy quark fields. For each operator we propose an unambiguous definition of the NP scale given by the energy at which unitarity is saturated. We also consider the possible existence of Higher Vector Bosons. We then study the tests realizable at present and future colliders. We start from the analysis of the high precision tests at Z peak, discussing separately the constraints obtained from the light fermionic sector and those due to the $b\bar b$ sector. We then consider the process $e^+e^-\to f\bar f$ at higher energies (LEP2 and NLC) and we propose the "Z peak subtracted representation" which allows to automatically take into account Z peak constraints and to describe several types of NP effects at any other energy. Applications to various NP effects (Higher Vector Bosons, Technicolour resonances, Anomalous Gauge Boson couplings) are given. We then concentrate on several bosonic processes, $e^+e^-\to W^+W^-$, $HZ$, $H\gamma$, and $\gamma\gamma$ collisions producing boson pairs or a single Higgs. We study the sensitivities to the various operators involved in the effective lagrangian and we propose ways to disentangle them. The NP scales which can be felt vary from a few TeV at LEP2 up to 200 TeV in single H production at NLC. |
0704.1429 | Alexey Gladyshev | A.V.Gladyshev, D.I.Kazakov, M.G.Paucar | Light stops in the MSSM parameter space | 10 pages, 10 eps figures | null | null | null | hep-ph | null | We consider the regions of the MSSM parameter space where the top squarks
become light and even may be the LSP. This happens when the triple scalar
coupling A becomes very big compared to m_0. We show that in this case the
requirement that the LSP is neutral imposes noticeable constraint on the
parameter space excluding low m_0 and m_{1/2} similar to constraint from the
Higgs mass limit. In some cases these constraints overlap. This picture takes
place in a wide region of \tan\beta. In a narrow band close to the border line
the stops are long-lived particles and decay into quarks and neutralino
(chargino). The cross-section of their production at LHC via gluon fusion
mechanism in this region may reach a few pb.
| [
{
"created": "Wed, 11 Apr 2007 14:39:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gladyshev",
"A. V.",
""
],
[
"Kazakov",
"D. I.",
""
],
[
"Paucar",
"M. G.",
""
]
] | We consider the regions of the MSSM parameter space where the top squarks become light and even may be the LSP. This happens when the triple scalar coupling A becomes very big compared to m_0. We show that in this case the requirement that the LSP is neutral imposes noticeable constraint on the parameter space excluding low m_0 and m_{1/2} similar to constraint from the Higgs mass limit. In some cases these constraints overlap. This picture takes place in a wide region of \tan\beta. In a narrow band close to the border line the stops are long-lived particles and decay into quarks and neutralino (chargino). The cross-section of their production at LHC via gluon fusion mechanism in this region may reach a few pb. |
hep-ph/0402055 | Jure Zupan | M. Gronau, Y. Grossman, N. Shuhmaher, A. Soffer, J. Zupan | Using untagged B^0 -> D K_S to determine gamma | 18 pages, same as published version | Phys.Rev. D69 (2004) 113003 | 10.1103/PhysRevD.69.113003 | null | hep-ph | null | It is shown that the weak phase gamma=arg(-V_{ud}V^*_{ub}V_{cb}V_{cd}^*) can
be determined using only untagged decays B/Bbar--> D K_S. In order to reduce
the uncertainty in gamma, we suggest combining information from B^{+-}-->
DK^{+-} and from untagged B^0 decays, where the D meson is observed in common
decay modes. Theoretical assumptions, which may further reduce the statistical
error, are also discussed.
| [
{
"created": "Thu, 5 Feb 2004 15:56:38 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Jun 2004 15:12:39 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Gronau",
"M.",
""
],
[
"Grossman",
"Y.",
""
],
[
"Shuhmaher",
"N.",
""
],
[
"Soffer",
"A.",
""
],
[
"Zupan",
"J.",
""
]
] | It is shown that the weak phase gamma=arg(-V_{ud}V^*_{ub}V_{cb}V_{cd}^*) can be determined using only untagged decays B/Bbar--> D K_S. In order to reduce the uncertainty in gamma, we suggest combining information from B^{+-}--> DK^{+-} and from untagged B^0 decays, where the D meson is observed in common decay modes. Theoretical assumptions, which may further reduce the statistical error, are also discussed. |
hep-ph/9502244 | Christo Christov | T.Watabe, Chr.V.Christov and K.Goeke | $E2/M1$ Ratio for the $\gamma N\rightarrow \Delta$ Transition in the
Chiral Quark Soliton Model | 11 pages, revtex, a figure included as a postscript file | Phys.Lett. B349 (1995) 197-203 | 10.1016/0370-2693(95)00227-C | RUB-TP2-1/95 | hep-ph | null | We calculate the electric quadrupole to magnetic dipole transition ratio
$E2/M1$ for the reaction $\gamma N \ra \Delta(1232)$ in the chiral quark
soliton model. The calculated $E2/M1$ ratio is in a good agreement with the
very new experimental data. We obtain non-zero negative value for the electric
quadrupole $N-\Delta$ transition moment, which suggests an oblate deformed
charge structure of the nucleon or/and the delta isobar. Other observables
related to this quantity, namely the $N-\Delta$ mass splitting, the isovector
charge radius, and isovector magnetic moment, are properly reproduced as well.
| [
{
"created": "Tue, 7 Feb 1995 15:10:56 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Watabe",
"T.",
""
],
[
"Christov",
"Chr. V.",
""
],
[
"Goeke",
"K.",
""
]
] | We calculate the electric quadrupole to magnetic dipole transition ratio $E2/M1$ for the reaction $\gamma N \ra \Delta(1232)$ in the chiral quark soliton model. The calculated $E2/M1$ ratio is in a good agreement with the very new experimental data. We obtain non-zero negative value for the electric quadrupole $N-\Delta$ transition moment, which suggests an oblate deformed charge structure of the nucleon or/and the delta isobar. Other observables related to this quantity, namely the $N-\Delta$ mass splitting, the isovector charge radius, and isovector magnetic moment, are properly reproduced as well. |
2205.07241 | Oliver Gould | Andreas Ekstedt, Oliver Gould and Johan L\"ofgren | Radiative first-order phase transitions to next-to-next-to-leading order | 7 pages, 3 figures; typo fixed in v3 | Phys. Rev. D 106 (2022) 3, 036012 | 10.1103/PhysRevD.106.036012 | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We develop new perturbative tools to accurately study radiatively-induced
first-order phase transitions. Previous perturbative methods have suffered
internal inconsistencies and been unsuccessful in reproducing lattice data,
which is often attributed to infrared divergences of massless modes (the Linde
problem). We employ a consistent power counting scheme to perform calculations,
and compare our results against lattice data. We conclude that the consistent
expansion removes many previous issues, and indicates that the infamous Linde
problem is not as big a factor in these calculations as previously thought.
| [
{
"created": "Sun, 15 May 2022 09:54:03 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Sep 2022 15:14:04 GMT",
"version": "v2"
},
{
"created": "Tue, 11 Jun 2024 11:03:40 GMT",
"version": "v3"
}
] | 2024-06-12 | [
[
"Ekstedt",
"Andreas",
""
],
[
"Gould",
"Oliver",
""
],
[
"Löfgren",
"Johan",
""
]
] | We develop new perturbative tools to accurately study radiatively-induced first-order phase transitions. Previous perturbative methods have suffered internal inconsistencies and been unsuccessful in reproducing lattice data, which is often attributed to infrared divergences of massless modes (the Linde problem). We employ a consistent power counting scheme to perform calculations, and compare our results against lattice data. We conclude that the consistent expansion removes many previous issues, and indicates that the infamous Linde problem is not as big a factor in these calculations as previously thought. |
hep-ph/9608323 | Nicholas Tracas | G.K. Leontaris and N.D. Tracas | Duality Constraints on Supersymmetric Unified Models and Radiative
Symmetry Breaking | LaTex file, 15 pages, 3 figures attached. Misprints in Eqs(28-32)
corrected. Shorter version to appear in Physics Letters B | Phys.Lett. B389 (1996) 515-522 | 10.1016/S0370-2693(96)01299-3 | IOA 02/96, NTUA 55-96 | hep-ph hep-th | null | Motivated from unified models with string origin, we analyse the constraints
from duality invariance on effective supergravity models with an intermediate
gauge symmetry. Requiring vanishing vacuum energy and invariance of the
superpotential couplings, we find that modular weights of the matter and higgs
fields are subject to various constraints. In addition, the vacuum expectation
values of the higgs fields breaking the intermediate gauge group, are
determined in terms of their modular weights and the moduli. We also examine
the possibility of breaking the intermediate gauge symmetry radiatively.
| [
{
"created": "Wed, 14 Aug 1996 15:41:35 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Aug 1996 15:20:54 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Sep 1996 08:08:56 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Leontaris",
"G. K.",
""
],
[
"Tracas",
"N. D.",
""
]
] | Motivated from unified models with string origin, we analyse the constraints from duality invariance on effective supergravity models with an intermediate gauge symmetry. Requiring vanishing vacuum energy and invariance of the superpotential couplings, we find that modular weights of the matter and higgs fields are subject to various constraints. In addition, the vacuum expectation values of the higgs fields breaking the intermediate gauge group, are determined in terms of their modular weights and the moduli. We also examine the possibility of breaking the intermediate gauge symmetry radiatively. |
hep-ph/0201082 | Cliff Burgess | C.P. Burgess, J. Cline, E. Filotas, J. Matias and G.D. Moore | Loop-Generated Bounds on Changes to the Graviton Dispersion Relation | 18 pages, LaTeX, 4 figures, uses revtex | JHEP0203:043,2002 | 10.1088/1126-6708/2002/03/043 | McGill-01/26, UW/PT 01-27 | hep-ph gr-qc hep-th | null | We identify the effective theory appropriate to the propagation of massless
bulk fields in brane-world scenarios, to show that the dominant low-energy
effect of asymmetric warping in the bulk is to modify the dispersion relation
of the effective 4-dimensional modes. We show how such changes to the graviton
dispersion relation may be bounded through the effects they imply, through
loops, for the propagation of standard model particles. We compute these bounds
and show that they provide, in some cases, the strongest constraints on
nonstandard gravitational dispersions. The bounds obtained in this way are the
strongest for the fewest extra dimensions and when the extra-dimensional Planck
mass is the smallest. Although the best bounds come for warped 5-D scenarios,
for which the 5D Planck Mass is O(TeV), even in 4 dimensions the graviton loop
can lead to a bound on the graviton speed which is comparable with other
constraints.
| [
{
"created": "Thu, 10 Jan 2002 21:16:05 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Burgess",
"C. P.",
""
],
[
"Cline",
"J.",
""
],
[
"Filotas",
"E.",
""
],
[
"Matias",
"J.",
""
],
[
"Moore",
"G. D.",
""
]
] | We identify the effective theory appropriate to the propagation of massless bulk fields in brane-world scenarios, to show that the dominant low-energy effect of asymmetric warping in the bulk is to modify the dispersion relation of the effective 4-dimensional modes. We show how such changes to the graviton dispersion relation may be bounded through the effects they imply, through loops, for the propagation of standard model particles. We compute these bounds and show that they provide, in some cases, the strongest constraints on nonstandard gravitational dispersions. The bounds obtained in this way are the strongest for the fewest extra dimensions and when the extra-dimensional Planck mass is the smallest. Although the best bounds come for warped 5-D scenarios, for which the 5D Planck Mass is O(TeV), even in 4 dimensions the graviton loop can lead to a bound on the graviton speed which is comparable with other constraints. |
1103.2035 | Defu Hou | Defu Hou, Hui Liu, and Hai-cang Ren | Some Field Theoretic Issues Regarding the Chiral Magnetic Effect | 19 pages, 4 figures in Latex. Typos fixed, version accepted to be
published in JHEP | JHEP 1105:046,2011 | 10.1007/JHEP05(2011)046 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we shall address some field theoretic issues regarding the
chiral magnetic effect. The general structure of the magnetic current
consistent with the electromagnetic gauge invariance is obtained and the impact
of the infrared divergence is examined. Some subtleties on the relation between
the chiral magnetic effect and the axial anomaly are clarified through a
careful examination of the infrared limit of the relevant thermal diagrams.
| [
{
"created": "Thu, 10 Mar 2011 13:48:12 GMT",
"version": "v1"
},
{
"created": "Fri, 6 May 2011 14:23:23 GMT",
"version": "v2"
}
] | 2011-05-13 | [
[
"Hou",
"Defu",
""
],
[
"Liu",
"Hui",
""
],
[
"Ren",
"Hai-cang",
""
]
] | In this paper, we shall address some field theoretic issues regarding the chiral magnetic effect. The general structure of the magnetic current consistent with the electromagnetic gauge invariance is obtained and the impact of the infrared divergence is examined. Some subtleties on the relation between the chiral magnetic effect and the axial anomaly are clarified through a careful examination of the infrared limit of the relevant thermal diagrams. |
2307.01336 | Fabio Dahia | F. Dahia and A.S.Lemos | The alpha particle charge radius, the radion and the proton radius
puzzle | null | null | null | null | hep-ph gr-qc physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent measurements of the Lamb shift of muonic helium-4 ions were used to
infer the alpha particle charge radius. The value found is compatible with the
radius extracted from the analysis of the electron-helium scattering. Thus, the
new spectroscopic data put additional empiric bounds on some free parameters of
certain physics theories beyond the Standard Model. In this paper, we analyze
the new data in the context of large extra-dimensional theories. Specifically,
we calculate the influence of the radion, the scalar degree of freedom of the
higher-dimensional gravity, on the energy difference between the 2S and 2P
levels of this exotic atom. The radion field is related to fluctuations of the
volume of the supplementary space, and, in comparison with the tensorial
degrees of freedom, it couples to matter in a different way. Moreover, as some
stabilization mechanism acts exclusively on the scalar degree of freedom, the
tensor and scalar fields should be treated as phenomenologically independent
quantities. Based on the spectroscopic data of muonic helium, we find
constraints for the effective energy scale of the radion as a function of the
alpha particle radius. Then, we discuss the implications of these new
constraints on the proton radius puzzle.
| [
{
"created": "Mon, 3 Jul 2023 20:14:39 GMT",
"version": "v1"
}
] | 2023-07-06 | [
[
"Dahia",
"F.",
""
],
[
"Lemos",
"A. S.",
""
]
] | Recent measurements of the Lamb shift of muonic helium-4 ions were used to infer the alpha particle charge radius. The value found is compatible with the radius extracted from the analysis of the electron-helium scattering. Thus, the new spectroscopic data put additional empiric bounds on some free parameters of certain physics theories beyond the Standard Model. In this paper, we analyze the new data in the context of large extra-dimensional theories. Specifically, we calculate the influence of the radion, the scalar degree of freedom of the higher-dimensional gravity, on the energy difference between the 2S and 2P levels of this exotic atom. The radion field is related to fluctuations of the volume of the supplementary space, and, in comparison with the tensorial degrees of freedom, it couples to matter in a different way. Moreover, as some stabilization mechanism acts exclusively on the scalar degree of freedom, the tensor and scalar fields should be treated as phenomenologically independent quantities. Based on the spectroscopic data of muonic helium, we find constraints for the effective energy scale of the radion as a function of the alpha particle radius. Then, we discuss the implications of these new constraints on the proton radius puzzle. |
hep-ph/9908291 | Muneyuki Ishida | Rukmani Mohanta, Anjan K. Giri, Mohinder P. Khanna (Panjab
University), Muneyuki Ishida(TIT) and Shin Ishida(Nihon University) | Weak Radiative Decay Lambda_b to Lambda gamma and Quark-Confined Effects
in the Covariant Oscillator Quark Model | 8 pages, uses ptptex.sty | Prog.Theor.Phys. 102 (1999) 645-652 | 10.1143/PTP.102.645 | null | hep-ph | null | Motivated by the observation of the decay B to K* gamma by the CLEO
collaboration, we have systematically analyzed the weak radiative decay
Lambda_b to Lambda gamma, evaluating the confined effects of quarks in the
covariant oscillator quark model. This decay process receives both short
distance (electromagnetic penguins at the one loop level) the long distance
contributions in the quark level. The long distance contributions are analyzed
using the vector meson dominance (VMD) method. The estimated branching ratio is
found to be 0.23 times 10^-5.
| [
{
"created": "Sat, 7 Aug 1999 05:24:24 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Mohanta",
"Rukmani",
"",
"Panjab\n University"
],
[
"Giri",
"Anjan K.",
"",
"Panjab\n University"
],
[
"Khanna",
"Mohinder P.",
"",
"Panjab\n University"
],
[
"Ishida",
"Muneyuki",
"",
"TIT"
],
[
"Ishida",
"Shin",
"",
... | Motivated by the observation of the decay B to K* gamma by the CLEO collaboration, we have systematically analyzed the weak radiative decay Lambda_b to Lambda gamma, evaluating the confined effects of quarks in the covariant oscillator quark model. This decay process receives both short distance (electromagnetic penguins at the one loop level) the long distance contributions in the quark level. The long distance contributions are analyzed using the vector meson dominance (VMD) method. The estimated branching ratio is found to be 0.23 times 10^-5. |
1203.0282 | Aleksander Kusina | T. Stavreva, F. I. Olness, I. Schienbein, T. Jezo, A. Kusina, K.
Kovarik, J. Y. Yu | Heavy Quark Production in the ACOT Scheme at NNLO and N3LO | 18 pages, 25 figures, updated to match journal version | Phys. Rev. D 85, 114014 (2012) | 10.1103/PhysRevD.85.114014 | LPSC 12-048; SMU-HEP-12-05; KA-TP-09-2012 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the properties of the ACOT scheme for heavy quark production and
make use of the \MSbar massless results at NNLO and N3LO for the structure
functions F2 and FL in neutral current deep-inelastic scattering to estimate
the higher order corrections. For this purpose we decouple the heavy quark mass
entering the phase space from the one entering the dynamics of the short
distance cross section. We show numerically that the phase space mass is
generally more important. Therefore, the dominant heavy quark mass effects at
higher orders can be taken into account using the massless Wilson coefficients
together with an appropriate slow-rescaling prescription implementing the phase
space constraints. Combining the exact ACOT scheme at NLO with these
expressions should provide a good approximation to the missing full calculation
in the ACOT scheme at NNLO and N3LO.
| [
{
"created": "Thu, 1 Mar 2012 20:14:13 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Mar 2012 17:14:05 GMT",
"version": "v2"
},
{
"created": "Mon, 11 Jun 2012 15:02:46 GMT",
"version": "v3"
}
] | 2012-06-12 | [
[
"Stavreva",
"T.",
""
],
[
"Olness",
"F. I.",
""
],
[
"Schienbein",
"I.",
""
],
[
"Jezo",
"T.",
""
],
[
"Kusina",
"A.",
""
],
[
"Kovarik",
"K.",
""
],
[
"Yu",
"J. Y.",
""
]
] | We analyze the properties of the ACOT scheme for heavy quark production and make use of the \MSbar massless results at NNLO and N3LO for the structure functions F2 and FL in neutral current deep-inelastic scattering to estimate the higher order corrections. For this purpose we decouple the heavy quark mass entering the phase space from the one entering the dynamics of the short distance cross section. We show numerically that the phase space mass is generally more important. Therefore, the dominant heavy quark mass effects at higher orders can be taken into account using the massless Wilson coefficients together with an appropriate slow-rescaling prescription implementing the phase space constraints. Combining the exact ACOT scheme at NLO with these expressions should provide a good approximation to the missing full calculation in the ACOT scheme at NNLO and N3LO. |
hep-ph/9212294 | null | Jizhi Wu and Richard Arnowitt | Very Large Intermediate Breaking Scale In The Gepner Three Generation
Model | 19 pages, Plain Tex (Three Figures not included) | Nucl.Phys.B421:125-134,1994 | 10.1016/0550-3213(94)90227-5 | CTP-TAMU-32/91 | hep-ph hep-th | null | A detailed study of the intermediate symmetry breaking scale, via the
renormalization group equations, for a three generation heterotic string model
arising from the N=2 superconformal construction is reported. The numerical
study shows that the model admits a very large intermediate breaking scale
$\op{>}{\sim}1.0\times10^{16}$ GeV. The role of the gauge singlets in this
model is studied, and it is found that these fields play a crucial role in
determining the directions and the scale of the intermediate symmetry breaking.
The importance of the mixing in generation space is also studied. The
generation mixing terms are found to have special effects in the intermediate
symmetry breaking. Remarkably these terms can produce some {\it new} Yukawa
couplings (not present at the Planck scale) through loops. These couplings are
in general very small compared to the ones with non-vanishing tree level values
and thus offer a {\it new} mechanism to solve the lepton/quark mass hierarchy
problem.
| [
{
"created": "Mon, 21 Dec 1992 20:33:46 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Wu",
"Jizhi",
""
],
[
"Arnowitt",
"Richard",
""
]
] | A detailed study of the intermediate symmetry breaking scale, via the renormalization group equations, for a three generation heterotic string model arising from the N=2 superconformal construction is reported. The numerical study shows that the model admits a very large intermediate breaking scale $\op{>}{\sim}1.0\times10^{16}$ GeV. The role of the gauge singlets in this model is studied, and it is found that these fields play a crucial role in determining the directions and the scale of the intermediate symmetry breaking. The importance of the mixing in generation space is also studied. The generation mixing terms are found to have special effects in the intermediate symmetry breaking. Remarkably these terms can produce some {\it new} Yukawa couplings (not present at the Planck scale) through loops. These couplings are in general very small compared to the ones with non-vanishing tree level values and thus offer a {\it new} mechanism to solve the lepton/quark mass hierarchy problem. |
1908.08949 | Jesse Thaler | Annie Y. Wei, Preksha Naik, Aram W. Harrow, Jesse Thaler | Quantum Algorithms for Jet Clustering | 21 pages, 1 table, 6 figures. v2: correction to doubling trick and
additional discussion of resource requirements; approximate version to appear
in PRD | Phys. Rev. D 101, 094015 (2020) | 10.1103/PhysRevD.101.094015 | MIT-CTP 5137 | hep-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Identifying jets formed in high-energy particle collisions requires solving
optimization problems over potentially large numbers of final-state particles.
In this work, we consider the possibility of using quantum computers to speed
up jet clustering algorithms. Focusing on the case of electron-positron
collisions, we consider a well-known event shape called thrust whose optimum
corresponds to the most jet-like separating plane among a set of particles,
thereby defining two hemisphere jets. We show how to formulate thrust both as a
quantum annealing problem and as a Grover search problem. A key component of
our analysis is the consideration of realistic models for interfacing classical
data with a quantum algorithm. With a sequential computing model, we show how
to speed up the well-known O(N^3) classical algorithm to an O(N^2) quantum
algorithm, including the O(N) overhead of loading classical data from N
final-state particles. Along the way, we also identify a way to speed up the
classical algorithm to O(N^2 log N) using a sorting strategy inspired by the
SISCone jet algorithm, which has no natural quantum counterpart. With a
parallel computing model, we achieve O(N log N) scaling in both the classical
and quantum cases. Finally, we consider the generalization of these quantum
methods to other jet algorithms more closely related to those used for
proton-proton collisions at the Large Hadron Collider.
| [
{
"created": "Fri, 23 Aug 2019 18:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 5 May 2020 23:06:05 GMT",
"version": "v2"
}
] | 2020-05-20 | [
[
"Wei",
"Annie Y.",
""
],
[
"Naik",
"Preksha",
""
],
[
"Harrow",
"Aram W.",
""
],
[
"Thaler",
"Jesse",
""
]
] | Identifying jets formed in high-energy particle collisions requires solving optimization problems over potentially large numbers of final-state particles. In this work, we consider the possibility of using quantum computers to speed up jet clustering algorithms. Focusing on the case of electron-positron collisions, we consider a well-known event shape called thrust whose optimum corresponds to the most jet-like separating plane among a set of particles, thereby defining two hemisphere jets. We show how to formulate thrust both as a quantum annealing problem and as a Grover search problem. A key component of our analysis is the consideration of realistic models for interfacing classical data with a quantum algorithm. With a sequential computing model, we show how to speed up the well-known O(N^3) classical algorithm to an O(N^2) quantum algorithm, including the O(N) overhead of loading classical data from N final-state particles. Along the way, we also identify a way to speed up the classical algorithm to O(N^2 log N) using a sorting strategy inspired by the SISCone jet algorithm, which has no natural quantum counterpart. With a parallel computing model, we achieve O(N log N) scaling in both the classical and quantum cases. Finally, we consider the generalization of these quantum methods to other jet algorithms more closely related to those used for proton-proton collisions at the Large Hadron Collider. |
1704.04523 | Ulrich Nierste | Ulrich Nierste and Stefan Schacht | CP asymmetries in $D\to PP^\prime$ decays | Talk at ICHEP2016, 3-10 August 2016, Chicago, USA, and CKM2016, 28
November - 3 December 2016, Tata Institute for Fundamental Research (TIFR),
Mumbai, India | null | null | TTP17-019 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This talk addresses two topics related to CP asymmetries in $D$ meson decays
to two pseudoscalar mesons. First I discuss how new physics can be
distinguished from the Standard Model through two sum rules relating three
direct CP asymmetries each, using the sum rule correlating $D^0\to K^+K^-$,
$D^0\to \pi^+ \pi^-$, and $D^0\to \pi^0 \pi^0$ for illustration. The other sum
rule involves $a_{CP}^{\mathrm{dir}}(D^+\rightarrow \bar{K}^0K^+)$,
$a_{CP}^{\mathrm{dir}}(D_s^+\rightarrow K^0\pi^+)$, and
$a_{CP}^{\mathrm{dir}}(D_s^+\to K^+ \pi^0)$. The second topic is the direct CP
asymmetry in the decay $D^0 \to K_S K_S$, which is expected to be large in the
Standard Model for two reasons: Flavor-SU(3) symmetry suppresses the tree
amplitude which enhances the crucial "penguin-to-tree" ratio and the "penguin"
amplitude is dominated by the tree-level $W$ boson exchange between $c$ and $u$
quarks. We find that $|a_{CP}^{\mathrm{dir}} (D^0 \to K_S K_S)|$ can be as
large as $1.1 \%$ in the Standard Model. We advocate $D^0 \to K_S K_S$ as a
discovery channel for charm CP violation.
| [
{
"created": "Fri, 14 Apr 2017 19:49:23 GMT",
"version": "v1"
}
] | 2017-04-18 | [
[
"Nierste",
"Ulrich",
""
],
[
"Schacht",
"Stefan",
""
]
] | This talk addresses two topics related to CP asymmetries in $D$ meson decays to two pseudoscalar mesons. First I discuss how new physics can be distinguished from the Standard Model through two sum rules relating three direct CP asymmetries each, using the sum rule correlating $D^0\to K^+K^-$, $D^0\to \pi^+ \pi^-$, and $D^0\to \pi^0 \pi^0$ for illustration. The other sum rule involves $a_{CP}^{\mathrm{dir}}(D^+\rightarrow \bar{K}^0K^+)$, $a_{CP}^{\mathrm{dir}}(D_s^+\rightarrow K^0\pi^+)$, and $a_{CP}^{\mathrm{dir}}(D_s^+\to K^+ \pi^0)$. The second topic is the direct CP asymmetry in the decay $D^0 \to K_S K_S$, which is expected to be large in the Standard Model for two reasons: Flavor-SU(3) symmetry suppresses the tree amplitude which enhances the crucial "penguin-to-tree" ratio and the "penguin" amplitude is dominated by the tree-level $W$ boson exchange between $c$ and $u$ quarks. We find that $|a_{CP}^{\mathrm{dir}} (D^0 \to K_S K_S)|$ can be as large as $1.1 \%$ in the Standard Model. We advocate $D^0 \to K_S K_S$ as a discovery channel for charm CP violation. |
1810.09388 | Mark Goodsell | Johannes Braathen, Mark D. Goodsell and Pietro Slavich | Matching renormalisable couplings: simple schemes and a plot | 59 pages, 7 figures. v2: added some explanations. Matches published
version | null | 10.1140/epjc/s10052-019-7093-9 | OU-HET-984 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss different choices that can be made when matching a general
high-energy theory -- with the restriction that it should not contain heavy
gauge bosons -- onto a general renormalisable effective field theory at one
loop, with particular attention to the quartic scalar couplings and Yukawa
couplings. This includes a generalisation of the counterterm scheme that was
found to be useful in the case of high-scale/split supersymmetry, but we show
the important differences when there are new heavy scalar fields in singlet or
triplet representations of $SU(2)$. We also analytically compare our methods
and choices with the approach of matching pole masses, proving the equivalence
with one of our choices. We outline how to make the extraction of quartic
couplings using pole masses more efficient, an approach that we hope will
generalise beyond one loop. We give examples of the impact of different scheme
choices in a toy model; we also discuss the MSSM and give the threshold
corrections to the Higgs quartic coupling in Dirac gaugino models.
| [
{
"created": "Mon, 22 Oct 2018 16:15:37 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Sep 2019 09:12:56 GMT",
"version": "v2"
}
] | 2019-09-23 | [
[
"Braathen",
"Johannes",
""
],
[
"Goodsell",
"Mark D.",
""
],
[
"Slavich",
"Pietro",
""
]
] | We discuss different choices that can be made when matching a general high-energy theory -- with the restriction that it should not contain heavy gauge bosons -- onto a general renormalisable effective field theory at one loop, with particular attention to the quartic scalar couplings and Yukawa couplings. This includes a generalisation of the counterterm scheme that was found to be useful in the case of high-scale/split supersymmetry, but we show the important differences when there are new heavy scalar fields in singlet or triplet representations of $SU(2)$. We also analytically compare our methods and choices with the approach of matching pole masses, proving the equivalence with one of our choices. We outline how to make the extraction of quartic couplings using pole masses more efficient, an approach that we hope will generalise beyond one loop. We give examples of the impact of different scheme choices in a toy model; we also discuss the MSSM and give the threshold corrections to the Higgs quartic coupling in Dirac gaugino models. |
1009.0947 | Joachim Brod | Joachim Brod, Martin Gorbahn and Emmanuel Stamou | Two-Loop Electroweak Corrections for the K -> pi nu anti-nu Decays | 20 pages, 6 figures; typos corrected, updated numerics using input
from PDG 2010, version as published in PRD | Phys.Rev.D83:034030,2011 | 10.1103/PhysRevD.83.034030 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The rare K -> pi nu anti-nu decays play a central role in testing the
Standard Model and its extensions. Upcoming experiments plan to measure the
decay rates with high accuracy. Yet, unknown higher-order electroweak
corrections result in a sizeable theory error. We remove this uncertainty by
computing the full two-loop electroweak corrections to the top-quark
contribution X_t to the rare decays K_L -> pi0 nu anti-nu, K+ -> pi+ nu
anti-nu, and B -> X_{d,s} nu anti-nu in the Standard Model. The remaining
theoretical uncertainty related to electroweak effects is now far below 1%.
Finally we update the branching ratios to find Br(K_L -> pi0 nu anti-nu) =
2.43(39)(6) * 10^-11 and Br(K+ -> pi+ nu anti-nu) = 7.81(75)(29) * 10^-11. The
first error summarises the parametric, the second the remaining theoretical
uncertainties.
| [
{
"created": "Sun, 5 Sep 2010 20:39:14 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Mar 2011 13:33:47 GMT",
"version": "v2"
}
] | 2011-03-02 | [
[
"Brod",
"Joachim",
""
],
[
"Gorbahn",
"Martin",
""
],
[
"Stamou",
"Emmanuel",
""
]
] | The rare K -> pi nu anti-nu decays play a central role in testing the Standard Model and its extensions. Upcoming experiments plan to measure the decay rates with high accuracy. Yet, unknown higher-order electroweak corrections result in a sizeable theory error. We remove this uncertainty by computing the full two-loop electroweak corrections to the top-quark contribution X_t to the rare decays K_L -> pi0 nu anti-nu, K+ -> pi+ nu anti-nu, and B -> X_{d,s} nu anti-nu in the Standard Model. The remaining theoretical uncertainty related to electroweak effects is now far below 1%. Finally we update the branching ratios to find Br(K_L -> pi0 nu anti-nu) = 2.43(39)(6) * 10^-11 and Br(K+ -> pi+ nu anti-nu) = 7.81(75)(29) * 10^-11. The first error summarises the parametric, the second the remaining theoretical uncertainties. |
hep-ph/9608248 | null | Jun Cao and Hui-fang Wu | Deuteron Electromagnetic Form Factors in the Intermediate Energy Region | 9 pages, to appear in Phys.Rev.C | Phys.Rev.C54:1006-1009,1996 | 10.1103/PhysRevC.54.1006 | IHEP-TH-95-34 | hep-ph nucl-th | null | Based on a Perturbative QCD analysis of the deuteron form factor, a model for
the reduced form factor is suggested. The numerical result is consistent with
the data in the intermediate energy region.
| [
{
"created": "Wed, 7 Aug 1996 22:28:02 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Cao",
"Jun",
""
],
[
"Wu",
"Hui-fang",
""
]
] | Based on a Perturbative QCD analysis of the deuteron form factor, a model for the reduced form factor is suggested. The numerical result is consistent with the data in the intermediate energy region. |
hep-ph/0008337 | Felipe J. Llanes-Estrada | Felipe J. Llanes-Estrada and Stephen R. Cotanch | Many-Body Coulomb Gauge Exotic and Charmed Hybrids | 12 pages including 3 figures | Phys.Lett. B504 (2001) 15-20 | 10.1016/S0370-2693(01)00290-8 | null | hep-ph | null | Utilizing a QCD Coulomb gauge Hamiltonian with linear confinement specified
by lattice, we report a relativistic many-body calculation for the light exotic
and charmed hybrid mesons. The Hamiltonian successfully describes both quark
and gluon sectors, with vacuum and quasiparticle properties generated by a BCS
transformation and more elaborate TDA and RPA diagonalizations for the meson
($q\bar{q}$) and glueball ($gg$) masses. Hybrids entail a computationally
intense relativistic three quasiparticle ($q\bar{q}g$) calculation with the 9
dimensional Hamiltonian matrix elements evaluated variationally by Monte Carlo
techniques. Our new TDA (RPA) spectrum for the nonexotic $1^{--}$ charmed
($c\bar{c}$ and $c\bar{c}g$) system provides an explanation for the
overpopulation of the observed $J/\psi$ states. For the important $1^{-+}$
light exotic channel we obtain hybrid masses above 2 $GeV$, in broad agreement
with lattice and flux tube models, indicating that the recently observed
resonances at 1.4 and 1.6 $GeV$ are of different, perhaps four quark,
structure.
| [
{
"created": "Thu, 31 Aug 2000 20:37:50 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Oct 2000 13:35:26 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Llanes-Estrada",
"Felipe J.",
""
],
[
"Cotanch",
"Stephen R.",
""
]
] | Utilizing a QCD Coulomb gauge Hamiltonian with linear confinement specified by lattice, we report a relativistic many-body calculation for the light exotic and charmed hybrid mesons. The Hamiltonian successfully describes both quark and gluon sectors, with vacuum and quasiparticle properties generated by a BCS transformation and more elaborate TDA and RPA diagonalizations for the meson ($q\bar{q}$) and glueball ($gg$) masses. Hybrids entail a computationally intense relativistic three quasiparticle ($q\bar{q}g$) calculation with the 9 dimensional Hamiltonian matrix elements evaluated variationally by Monte Carlo techniques. Our new TDA (RPA) spectrum for the nonexotic $1^{--}$ charmed ($c\bar{c}$ and $c\bar{c}g$) system provides an explanation for the overpopulation of the observed $J/\psi$ states. For the important $1^{-+}$ light exotic channel we obtain hybrid masses above 2 $GeV$, in broad agreement with lattice and flux tube models, indicating that the recently observed resonances at 1.4 and 1.6 $GeV$ are of different, perhaps four quark, structure. |
1403.1945 | Mohamed Mohamed | M. Abu-Shady and A. K. Abu-Nab | Nucleon Properties at Finite Temperature in the Extended Quark-Sigma
Model | 6 pages, 6 figures The misprints are corrected in the last published
version | American Journal of Physics and Applications. Vol. 2, No. 2, 2014,
pp. 46-51 | 10.11648/j.ajpa.20140202.11 | null | hep-ph | http://creativecommons.org/licenses/by/3.0/ | Hadron properties are studied at hot medium using the quark sigma model. The
quark sigma model is extended to include eighth-order of mesonic interactions
based on some aspects of quantum chromodynamic (QCD) theory. The extended
effective potential tends to the original effective potential when the coupling
between the higher order mesonic interactions equal to zero. The field
equations have been solved in the mean-field approximation by using the
extended iteration method. We found that the nucleon mass increases with
increasing temperature and the magnetic moments of proton and neutron increase
with increasing temperature. A comparison is presented with recent previous
works and other models. We conclude that higher-order mesonic interactions play
an important role in changing the behavior of nucleon properties at finite
temperature. In addition, the deconfinement phase transition is satisfied in
the present model.
| [
{
"created": "Sat, 8 Mar 2014 07:37:22 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Jan 2015 15:59:45 GMT",
"version": "v2"
}
] | 2015-01-05 | [
[
"Abu-Shady",
"M.",
""
],
[
"Abu-Nab",
"A. K.",
""
]
] | Hadron properties are studied at hot medium using the quark sigma model. The quark sigma model is extended to include eighth-order of mesonic interactions based on some aspects of quantum chromodynamic (QCD) theory. The extended effective potential tends to the original effective potential when the coupling between the higher order mesonic interactions equal to zero. The field equations have been solved in the mean-field approximation by using the extended iteration method. We found that the nucleon mass increases with increasing temperature and the magnetic moments of proton and neutron increase with increasing temperature. A comparison is presented with recent previous works and other models. We conclude that higher-order mesonic interactions play an important role in changing the behavior of nucleon properties at finite temperature. In addition, the deconfinement phase transition is satisfied in the present model. |
2008.07051 | Mauro Napsuciale | M. Napsuciale, S. Rodr\'iguez, H. Hern\'andez-Arellano | Kinetic mixing, custodial symmetry and a lower bound on the dark
$Z^{\prime}$ mass | 9 pages, notation changed to harmonize it with the PDG one, radiative
corrections by SM particles explicitly included | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we consider the extension of the standard model by dark fields
with an Abelian $U(1)_{d}$ spontaneously broken gauge symmetry in a hidden dark
matter scenario. Considering all the dimension four gauge invariant terms we
show that the tree-level relation $M^{2}_{W}=M^{2}_{\tilde Z} \cos^{2} \tilde
\theta_{w}$ holds and permits to write the mixing angle induced by the kinetic
mixing in the neutral massive gauge boson sector, $\theta_{\zeta}$, in terms of
the values of $M_{Z}$, the weak mixing angle and of the mass of the physical
dark gauge $Z^{\prime}$ boson. At the loop level, a similar relation is
obtained in the $\overline{MS}$ scheme. Using the result extracted from the
global fit to electroweak precision data for the ratio
$\rho_{0}=M^{2}_{W}/\hat{c}^{2}_{Z} M^{2}_{Z}\hat{\rho}$, we obtain a lower
bound $M_{Z^{\prime}}> M_{Z}$ for the dark $Z^{\prime}$ mass at the $94\%$
confidence level. We argue that this lower bound holds in the general case of
theories for physics beyond the standard model with an extra $U(1)$ gauge
factor subgroup, whenever the extended Higgs potential respects custodial
symmetry.
| [
{
"created": "Mon, 17 Aug 2020 01:33:12 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Oct 2021 10:56:38 GMT",
"version": "v2"
}
] | 2021-10-19 | [
[
"Napsuciale",
"M.",
""
],
[
"Rodríguez",
"S.",
""
],
[
"Hernández-Arellano",
"H.",
""
]
] | In this work we consider the extension of the standard model by dark fields with an Abelian $U(1)_{d}$ spontaneously broken gauge symmetry in a hidden dark matter scenario. Considering all the dimension four gauge invariant terms we show that the tree-level relation $M^{2}_{W}=M^{2}_{\tilde Z} \cos^{2} \tilde \theta_{w}$ holds and permits to write the mixing angle induced by the kinetic mixing in the neutral massive gauge boson sector, $\theta_{\zeta}$, in terms of the values of $M_{Z}$, the weak mixing angle and of the mass of the physical dark gauge $Z^{\prime}$ boson. At the loop level, a similar relation is obtained in the $\overline{MS}$ scheme. Using the result extracted from the global fit to electroweak precision data for the ratio $\rho_{0}=M^{2}_{W}/\hat{c}^{2}_{Z} M^{2}_{Z}\hat{\rho}$, we obtain a lower bound $M_{Z^{\prime}}> M_{Z}$ for the dark $Z^{\prime}$ mass at the $94\%$ confidence level. We argue that this lower bound holds in the general case of theories for physics beyond the standard model with an extra $U(1)$ gauge factor subgroup, whenever the extended Higgs potential respects custodial symmetry. |
0812.0265 | Ekaterina Christova | Ekaterina Christova, Helmut Eberl and Elena Ginina | CP violation in charged Higgs boson decays | a talk presented at the workshop "Prospects for Charged Higgs
Discovery at Colliders", September 16-19 2008, Uppsala Universtity, Sweden, 6
pages with 3 figures. to appear in the Proceedings of the workshop | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | CP violation in H^\pm decays into the three possible decay modes into
ordinary particles, 1) H^\pm \to tb, 2) H^\pm \to \nu \tau and 3) H^\pm \to
W^\pm h^0 is considered. Analytic expressions and numerical results for the CP
violating decay rate asymmetries in the MSSM are obtained. Increasing \tan\beta
the asymmetries for the fermionic decays, H^\pm \to tb and H^\pm \to \nu \tau,
decrease and it increases for H^\pm \to W^\pm h^0. The asymmetry of H^\pm \to
tb is most sensitive to the phase of $A_t and can go up to 20%, the asymmetries
of 2) and 3) depend mainly on the phases of A_\tau and M_1. The asymmetry of 2)
is smaller than 0.5% and of 3) can reach up to 2%.
| [
{
"created": "Mon, 1 Dec 2008 10:55:03 GMT",
"version": "v1"
}
] | 2009-04-14 | [
[
"Christova",
"Ekaterina",
""
],
[
"Eberl",
"Helmut",
""
],
[
"Ginina",
"Elena",
""
]
] | CP violation in H^\pm decays into the three possible decay modes into ordinary particles, 1) H^\pm \to tb, 2) H^\pm \to \nu \tau and 3) H^\pm \to W^\pm h^0 is considered. Analytic expressions and numerical results for the CP violating decay rate asymmetries in the MSSM are obtained. Increasing \tan\beta the asymmetries for the fermionic decays, H^\pm \to tb and H^\pm \to \nu \tau, decrease and it increases for H^\pm \to W^\pm h^0. The asymmetry of H^\pm \to tb is most sensitive to the phase of $A_t and can go up to 20%, the asymmetries of 2) and 3) depend mainly on the phases of A_\tau and M_1. The asymmetry of 2) is smaller than 0.5% and of 3) can reach up to 2%. |
2111.12469 | Nikolaos Stefanis | Sergey Mikhailov, Alexandr Pimikov, N. G. Stefanis | Improved calculation of the $\gamma^*\gamma \rightarrow \pi$ process at
low $Q^2$ using LCSR's and renormalization-group summation | 8 pages, 3 figures. Work dedicated to the memory of Maxim Polyakov, a
deeply admired colleague and friend of ours. Presented at Virtual Tribute to
Quark Confinement and the Hadron Spectrum, August 2nd-6th, 2021 | null | 10.1051/epjconf/202225803003 | RUB-TPII-03/2021 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study two versions of lightcone sum rules to calculate the
$\gamma^*\gamma\rightarrow\pi^0$ transition form factor (TFF) within QCD. While
the standard version is based on fixed-order perturbation theory by means of a
power-series expansion in the strong coupling, the new method incorporates
radiative corrections by renormalization-group summation and generates an
expansion within a generalized fractional analytic perturbation theory
involving only analytic couplings. Using this scheme, we determine the relative
nonperturbative parameters and the first two Gegenbauer coefficients of the
pion distribution amplitude (DA) to obtain TFF predictions in good agreement
with the preliminary BESIII data, while the best-fit pion DA satisfies the most
recent lattice constraints on the second moment of the pion DA at the
three-loop level.
| [
{
"created": "Wed, 24 Nov 2021 12:44:18 GMT",
"version": "v1"
}
] | 2022-02-16 | [
[
"Mikhailov",
"Sergey",
""
],
[
"Pimikov",
"Alexandr",
""
],
[
"Stefanis",
"N. G.",
""
]
] | We study two versions of lightcone sum rules to calculate the $\gamma^*\gamma\rightarrow\pi^0$ transition form factor (TFF) within QCD. While the standard version is based on fixed-order perturbation theory by means of a power-series expansion in the strong coupling, the new method incorporates radiative corrections by renormalization-group summation and generates an expansion within a generalized fractional analytic perturbation theory involving only analytic couplings. Using this scheme, we determine the relative nonperturbative parameters and the first two Gegenbauer coefficients of the pion distribution amplitude (DA) to obtain TFF predictions in good agreement with the preliminary BESIII data, while the best-fit pion DA satisfies the most recent lattice constraints on the second moment of the pion DA at the three-loop level. |
1309.7256 | Xin Liu | Xin Liu, Zhen-Jun Xiao, and Zhi-Tian Zou | Branching Ratios and CP Violations of B \to K_0^*(1430) K^* Decays in
the pQCD Approach | revtex file, 14 pages, 1 figure, contents improved and typos
corrected. Accepted for publication in Phys.Rev.D | null | 10.1103/PhysRevD.88.094003 | JSNU/PHY-TH-2013 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate $B \to K_0^*(1430) K^*$ decays in the perturbative QCD(pQCD)
factorization approach, where $B$ denotes $B_u$, $B_d$ and $B_s$ meson
respectively, and the scalar $K_0^*(1430)$ is considered as a meson based on
the model of conventional two-quark structure. With the light-cone distribution
amplitude of $K_0^*(1430)$ defined in two scenarios, namely Scenario 1 and
Scenario 2, we make the first estimation for the branching ratios and
CP-violating asymmetries for those concerned decay modes in the pQCD
factorization approach. For all considered $B \to K_0^*(1430) K^*$ decays in
this paper, only one preliminary upper limit on the branching ratio of $B^0 \to
{K_0^*(1430)}^0 \bar{K}^{*0}$ measured at 90% C.L. by Belle Collaboration is
available now. It is therefore of great interest to examine the predicted
physical quantities at two $B$ factories, Large Hadron Collider experiments,
and forthcoming Super-$B$ facility, then test the reliability of the pQCD
approach employed to study the considered decay modes involving a $p$-wave
scalar meson as one of the final state mesons. Furthermore, these pQCD
predictions combined with the future precision measurements are also helpful to
explore the complicated QCD dynamics involved in the light scalars.
| [
{
"created": "Fri, 27 Sep 2013 14:57:28 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Oct 2013 02:13:44 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Liu",
"Xin",
""
],
[
"Xiao",
"Zhen-Jun",
""
],
[
"Zou",
"Zhi-Tian",
""
]
] | We investigate $B \to K_0^*(1430) K^*$ decays in the perturbative QCD(pQCD) factorization approach, where $B$ denotes $B_u$, $B_d$ and $B_s$ meson respectively, and the scalar $K_0^*(1430)$ is considered as a meson based on the model of conventional two-quark structure. With the light-cone distribution amplitude of $K_0^*(1430)$ defined in two scenarios, namely Scenario 1 and Scenario 2, we make the first estimation for the branching ratios and CP-violating asymmetries for those concerned decay modes in the pQCD factorization approach. For all considered $B \to K_0^*(1430) K^*$ decays in this paper, only one preliminary upper limit on the branching ratio of $B^0 \to {K_0^*(1430)}^0 \bar{K}^{*0}$ measured at 90% C.L. by Belle Collaboration is available now. It is therefore of great interest to examine the predicted physical quantities at two $B$ factories, Large Hadron Collider experiments, and forthcoming Super-$B$ facility, then test the reliability of the pQCD approach employed to study the considered decay modes involving a $p$-wave scalar meson as one of the final state mesons. Furthermore, these pQCD predictions combined with the future precision measurements are also helpful to explore the complicated QCD dynamics involved in the light scalars. |
1305.1601 | Takashi Toma | Takashi Toma | Gamma-rays Constraint on Higgs Production from Dark Matter Annihilation | 4 pages, 3 figures, Proceeding for the Toyama International Workshop
"Higgs as a Probe of New Physics 2013 (HPNP2013)", 13-16 February 2013 | null | null | IPPP/13/27, DCPT/13/54 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A gamma line signal in cosmic-ray observation would be found when Higgs is
produced at rest or almost rest by DM annihilation because of decay of 126 GeV
Higgs into two gamma. This line signal gives a constraint on Higgs production
cross section by DM. We examine this point with simple analysis in this work.
| [
{
"created": "Tue, 7 May 2013 18:20:13 GMT",
"version": "v1"
}
] | 2013-05-08 | [
[
"Toma",
"Takashi",
""
]
] | A gamma line signal in cosmic-ray observation would be found when Higgs is produced at rest or almost rest by DM annihilation because of decay of 126 GeV Higgs into two gamma. This line signal gives a constraint on Higgs production cross section by DM. We examine this point with simple analysis in this work. |
hep-ph/0410401 | Roberto Casalbuoni | R.Casalbuoni, R.Gatto, M.Mannarelli, G.Nardulli and M.Ruggieri | Meissner masses in the gCFL phase of QCD | New Fig. 1 shows that also the masses of the gluons 3 and 8 are
imaginary | Phys.Lett.B605:362-368,2005; Erratum-ibid.B615:297,2005 | 10.1016/j.physletb.2004.11.045 10.1016/j.physletb.2005.04.025 | BARI-TH 498/04 | hep-ph | null | We calculate the Meissner masses of gluons in neutral three-flavor color
superconducting matter for finite strange quark mass. In the CFL phase the
eissner masses are slowly varying function of the strange quark mass. For large
strange quark mass, in the so called gCFL phase, the Meissner masses of gluons
with colors $a=1,2,3$ and 8 become imaginary, indicating an instability.
| [
{
"created": "Fri, 29 Oct 2004 10:19:51 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Nov 2004 16:27:10 GMT",
"version": "v2"
},
{
"created": "Mon, 11 Apr 2005 12:33:20 GMT",
"version": "v3"
}
] | 2010-11-05 | [
[
"Casalbuoni",
"R.",
""
],
[
"Gatto",
"R.",
""
],
[
"Mannarelli",
"M.",
""
],
[
"Nardulli",
"G.",
""
],
[
"Ruggieri",
"M.",
""
]
] | We calculate the Meissner masses of gluons in neutral three-flavor color superconducting matter for finite strange quark mass. In the CFL phase the eissner masses are slowly varying function of the strange quark mass. For large strange quark mass, in the so called gCFL phase, the Meissner masses of gluons with colors $a=1,2,3$ and 8 become imaginary, indicating an instability. |
2108.01351 | Majid Modarres | N. Olanj and M. Modarres | A detailed study of charm content of a proton in the frameworks of the
Kimber-Martin-Ryskin and Martin-Ryskin-Watt approaches | null | Nucl.Phys.A 998 (2020) 121735 | 10.1016/j.nuclphysa.2020.121735 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The charm structure function, ($F_2^{c\overline{c}}(x, Q^2)$), is calculated
in the framework of the $k_t$-factorization formalism by using the unintegrated
parton distribution functions (UPDF), which are generated through the Kimber et
al. (KMR) and Martin et al. (MRW) procedures. The Martin group (MMHT2014)
parton distribution functions (PDF) is used as the input PDF for the
corresponding UPDF. The resulted $F_2^{c\overline{c}}(x, Q^2)$ is compared with
the predicted data and the calculations given by the ZEUS and H1
collaborations, the parton pQCD theory, i.e. the general-mass
variable-flavour-number scheme (GMVFNS), the LO collinear procedure and the
saturation model introduced by Golec-Biernat and W\"usthoff (GBW),
respectively. In general, it is shown that the calculated charm structure
functions based on the stated above two UPDF schemes are consistent with the
experimental data and other theoretical predictions. Also, a short discussion
is presented regarding the KMR and MRW UPDF behaviors.
| [
{
"created": "Tue, 3 Aug 2021 08:12:28 GMT",
"version": "v1"
}
] | 2021-08-04 | [
[
"Olanj",
"N.",
""
],
[
"Modarres",
"M.",
""
]
] | The charm structure function, ($F_2^{c\overline{c}}(x, Q^2)$), is calculated in the framework of the $k_t$-factorization formalism by using the unintegrated parton distribution functions (UPDF), which are generated through the Kimber et al. (KMR) and Martin et al. (MRW) procedures. The Martin group (MMHT2014) parton distribution functions (PDF) is used as the input PDF for the corresponding UPDF. The resulted $F_2^{c\overline{c}}(x, Q^2)$ is compared with the predicted data and the calculations given by the ZEUS and H1 collaborations, the parton pQCD theory, i.e. the general-mass variable-flavour-number scheme (GMVFNS), the LO collinear procedure and the saturation model introduced by Golec-Biernat and W\"usthoff (GBW), respectively. In general, it is shown that the calculated charm structure functions based on the stated above two UPDF schemes are consistent with the experimental data and other theoretical predictions. Also, a short discussion is presented regarding the KMR and MRW UPDF behaviors. |
hep-ph/0507125 | Vladimir Zhukovsky | D. Ebert (1), V.Ch. Zhukovsky (2), O.V. Tarasov (2) ((1) Institute of
Physics, Humboldt-University, Berlin, Germany, (2) Physical Department,
Moscow State University, Moscow, Russia) | Competition of Color Ferromagnetic and Superconductive States in a
Quark-Gluon System | 21 pages, 4 Postscript figures | Phys.Rev. D72 (2005) 096007 | 10.1103/PhysRevD.72.096007 | null | hep-ph | null | The possibility of color ferromagnetism in an SU(2) gauge field model is
investigated. The conditions allowing a stable color ferromagnetic state of the
quark system in the chromomagnetic field occupying small domains are
considered. A phase transition between this state and the color superconducting
state is considered. The effect of finite temperature is analyzed.
| [
{
"created": "Mon, 11 Jul 2005 11:51:28 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Ebert",
"D.",
""
],
[
"Zhukovsky",
"V. Ch.",
""
],
[
"Tarasov",
"O. V.",
""
]
] | The possibility of color ferromagnetism in an SU(2) gauge field model is investigated. The conditions allowing a stable color ferromagnetic state of the quark system in the chromomagnetic field occupying small domains are considered. A phase transition between this state and the color superconducting state is considered. The effect of finite temperature is analyzed. |
hep-ph/9905382 | Cong-Feng Qiao | Cong-Feng Qiao, Han-Wen Huang and Kuang-Ta Chao | Large Possible retardation effects of quark confinement on the meson
spectrum II | 11 pages, RevTex, to appear in PRD | Phys.Rev. D60 (1999) 094004 | 10.1103/PhysRevD.60.094004 | DESY 99-061 and PUTP-98-35 | hep-ph | null | We present the results of a study of heavy-light-quark bound states in the
context of the reduced Bethe-Salpeter equation with relativistic vector and
scalar interactions. We find that satisfactory fits may also be obtained when
the retarded effect of the quark-antiquark interaction is concerned.
| [
{
"created": "Tue, 18 May 1999 10:02:35 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Qiao",
"Cong-Feng",
""
],
[
"Huang",
"Han-Wen",
""
],
[
"Chao",
"Kuang-Ta",
""
]
] | We present the results of a study of heavy-light-quark bound states in the context of the reduced Bethe-Salpeter equation with relativistic vector and scalar interactions. We find that satisfactory fits may also be obtained when the retarded effect of the quark-antiquark interaction is concerned. |
hep-ph/0410125 | Gursevil Turan | H. Acar and G. Turan | B-> X_d \ell^+\ell^- in a CP softly broken two Higgs doublet model | 15 pages, 13 figures | Acta Phys.Polon. B35 (2004) 687-703 | null | null | hep-ph | null | We study the differential branching ratio, forward-backward asymmetry,
CP-violating asymmetry, CP-violating asymmetry in the forward-backward
asymmetry and polarization asymmetries of the final lepton in the B-> X_d
\ell^+\ell^- decays in the context of a CP softly broken two Higgs doublet
model. We analyze the dependencies of these observables on the model parameters
by paying a special attention to the effects of neutral Higgs boson (NHB)
exchanges and possible CP violating effects. We find that NHB effects are quite
significant for the \tau mode. The above-mentioned observables seems to be
promising as a testing ground for new physics beyond the SM, especially for the
existence of the CP-violating phase in the theory.
| [
{
"created": "Fri, 8 Oct 2004 06:51:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Acar",
"H.",
""
],
[
"Turan",
"G.",
""
]
] | We study the differential branching ratio, forward-backward asymmetry, CP-violating asymmetry, CP-violating asymmetry in the forward-backward asymmetry and polarization asymmetries of the final lepton in the B-> X_d \ell^+\ell^- decays in the context of a CP softly broken two Higgs doublet model. We analyze the dependencies of these observables on the model parameters by paying a special attention to the effects of neutral Higgs boson (NHB) exchanges and possible CP violating effects. We find that NHB effects are quite significant for the \tau mode. The above-mentioned observables seems to be promising as a testing ground for new physics beyond the SM, especially for the existence of the CP-violating phase in the theory. |
hep-ph/9408355 | Joern Haeuser | J.M. Haeuser, W. Cassing, A. Peter and M.H. Thoma | Connected Green function approach to ground state symmetry breaking in
$\Phi^4_{1+1}$-theory | 25 Revtex pages, 5 figures available via fpt from the directory
ugi-94-11 of ftp@theorie.physik.uni-giessen.de as one postscript file (there
was a bug in our calculations, all numerical results and figures have changed
significantly), ugi-94-11 | Z.Phys. A353 (1996) 301-310 | 10.1007/BF01292336 | null | hep-ph | null | Using the cluster expansions for n-point Green functions we derive a closed
set of dynamical equations of motion for connected equal-time Green functions
by neglecting all connected functions higher than $4^{th}$ order for the
$\lambda \Phi^4$-theory in $1+1$ dimensions. We apply the equations to the
investigation of spontaneous ground state symmetry breaking, i.e. to the
evaluation of the effective potential at temperature $T=0$. Within our momentum
space discretization we obtain a second order phase transition (in agreement
with the Simon-Griffith theorem) and a critical coupling of
$\lambda_{crit}/4m^2=2.446$ as compared to a first order phase transition and
$\lambda_{crit}/4m^2=2.568$ from the Gaussian effective potential approach.
| [
{
"created": "Tue, 23 Aug 1994 12:23:13 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Aug 1994 16:54:22 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Sep 1994 13:22:58 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Haeuser",
"J. M.",
""
],
[
"Cassing",
"W.",
""
],
[
"Peter",
"A.",
""
],
[
"Thoma",
"M. H.",
""
]
] | Using the cluster expansions for n-point Green functions we derive a closed set of dynamical equations of motion for connected equal-time Green functions by neglecting all connected functions higher than $4^{th}$ order for the $\lambda \Phi^4$-theory in $1+1$ dimensions. We apply the equations to the investigation of spontaneous ground state symmetry breaking, i.e. to the evaluation of the effective potential at temperature $T=0$. Within our momentum space discretization we obtain a second order phase transition (in agreement with the Simon-Griffith theorem) and a critical coupling of $\lambda_{crit}/4m^2=2.446$ as compared to a first order phase transition and $\lambda_{crit}/4m^2=2.568$ from the Gaussian effective potential approach. |
hep-ph/9712312 | Per Osland | P.N. Burrows (MIT) and P. Osland (Bergen and DESY) | Event Orientation in e+e- Annihilation | 8 pages, LaTeX, 4 figures, uses epsf, to appear in the Proceedings of
the XIIth International Workshop on High Energy Physics and Quantum Field
Theory, 4-10 September 1997, Samara, Russia | null | null | DESY 97-244 | hep-ph hep-ex | null | We review the orientation of e+e- \to q\bar q g events in terms of the polar
and azimuthal angles of the event plane w.r.t. the electron beam direction. The
asymmetry of the azimuthal-angle distribution is, like the left-right
forward-backward polar-angle asymmetry, sensitive to parity-violating effects
in three-jet events; these are presently being explored experimentally. We
present these observables at O(\alpha_s) in perturbative QCD and discuss their
dependence on longitudinal beam polarisation and c.m. energy. A moments
analysis in terms of the orientation angles allows a more detailed test of QCD
by isolating the independent helicity cross-sections.
| [
{
"created": "Tue, 9 Dec 1997 11:48:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Burrows",
"P. N.",
"",
"MIT"
],
[
"Osland",
"P.",
"",
"Bergen and DESY"
]
] | We review the orientation of e+e- \to q\bar q g events in terms of the polar and azimuthal angles of the event plane w.r.t. the electron beam direction. The asymmetry of the azimuthal-angle distribution is, like the left-right forward-backward polar-angle asymmetry, sensitive to parity-violating effects in three-jet events; these are presently being explored experimentally. We present these observables at O(\alpha_s) in perturbative QCD and discuss their dependence on longitudinal beam polarisation and c.m. energy. A moments analysis in terms of the orientation angles allows a more detailed test of QCD by isolating the independent helicity cross-sections. |
hep-ph/9909399 | Ntu hexg | Xiao-Gang He and German Valencia | Comment on the Matrix Element of $O_{11}$ | 6 pages, Latex | Phys.Rev.D61:117501,2000 | 10.1103/PhysRevD.61.117501 | ISU-HET-99-8 | hep-ph | null | The gluon dipole operator, $O_{11}$, has received much attention recently
because it can have a large coefficient in some SUSY extensions of the standard
model. We find that the commonly used matrix element of $O_{11}$ of Bertolini,
Eeg and Fabbrichesi is in rough (but accidental) numerical agreement with an
estimate based on dimensional analysis.
| [
{
"created": "Thu, 16 Sep 1999 12:15:04 GMT",
"version": "v1"
}
] | 2009-12-15 | [
[
"He",
"Xiao-Gang",
""
],
[
"Valencia",
"German",
""
]
] | The gluon dipole operator, $O_{11}$, has received much attention recently because it can have a large coefficient in some SUSY extensions of the standard model. We find that the commonly used matrix element of $O_{11}$ of Bertolini, Eeg and Fabbrichesi is in rough (but accidental) numerical agreement with an estimate based on dimensional analysis. |
hep-ph/0701016 | Ernest Ma | Ernest Ma (UC Riverside) | New Lepton Family Symmetry and Neutrino Tribimaximal Mixing | 8 pages, no figure | Europhys.Lett.79:61001,2007 | 10.1209/0295-5075/79/61001 | UCRHEP-T429 (Jan 07) | hep-ph | null | The newly proposed finite symmetry Sigma(81) is applied to the problem of
neutrino tribimaximal mixing. The result is more satisfactory than those of
previous models based on A_4 in that the use of auxiliary symmetries (or
mechanisms) may be avoided. Deviations from the tribimaximal pattern are
expected, but because of its basic structure, only tan^2 (theta_12) may differ
significantly from 0.5 (say 0.45) with sin^2 (2 theta_23) remaining very close
to one, and theta_13 very nearly zero.
| [
{
"created": "Tue, 2 Jan 2007 22:47:23 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Jul 2007 20:19:57 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Ma",
"Ernest",
"",
"UC Riverside"
]
] | The newly proposed finite symmetry Sigma(81) is applied to the problem of neutrino tribimaximal mixing. The result is more satisfactory than those of previous models based on A_4 in that the use of auxiliary symmetries (or mechanisms) may be avoided. Deviations from the tribimaximal pattern are expected, but because of its basic structure, only tan^2 (theta_12) may differ significantly from 0.5 (say 0.45) with sin^2 (2 theta_23) remaining very close to one, and theta_13 very nearly zero. |
2112.15570 | Kun Wang | Kun Wang, Pengfu Tian, Jingya Zhu | Exploring Heavy Higgs Bosons at a 100 TeV Hadron Collider within the
Semi-Constrained NMSSM | 10 pages, 3 figures, 1 tables | Chin. Phys. C 48, no.9,093108 (2024) | 10.1088/1674-1137/ad5663 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this study, we explore the detectability of heavy Higgs bosons in the $pp
\to b\bar{b}H/A \to b\bar{b}t\bar{t}$ channel at a 100 TeV hadron collider
within the semi-constrained Next-to-Minimal Supersymmetric Standard Model
(NMSSM). We calculate their production cross sections and decay branching
ratios, comparing these with simulation results from existing reference. We
focus on the heavy, doublet-dominated CP-even Higgs $H$ and CP-odd Higgs $A$,
with mass limits set below 10 TeV to ensure detectability. We find that at a
collider with 3 ab$^{-1}$ of integrated luminosity, the potential for detecting
heavy Higgs bosons varies significantly with their mass and $\tan\beta$. Heavy
Higgs bosons below 2 TeV are within the testable range, while those heavier
than 7 TeV fall below the exclusion and discovery thresholds, rendering them
undetectable. For masses between 2 and 7 TeV, heavy Higgs bosons with
$\tan\beta$ less than 20 can be detected, whereas those with $\tan\beta$
greater than 20 are beyond the current discovery or exclusion capabilities.
| [
{
"created": "Fri, 31 Dec 2021 17:51:12 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Apr 2024 15:05:25 GMT",
"version": "v2"
}
] | 2024-07-26 | [
[
"Wang",
"Kun",
""
],
[
"Tian",
"Pengfu",
""
],
[
"Zhu",
"Jingya",
""
]
] | In this study, we explore the detectability of heavy Higgs bosons in the $pp \to b\bar{b}H/A \to b\bar{b}t\bar{t}$ channel at a 100 TeV hadron collider within the semi-constrained Next-to-Minimal Supersymmetric Standard Model (NMSSM). We calculate their production cross sections and decay branching ratios, comparing these with simulation results from existing reference. We focus on the heavy, doublet-dominated CP-even Higgs $H$ and CP-odd Higgs $A$, with mass limits set below 10 TeV to ensure detectability. We find that at a collider with 3 ab$^{-1}$ of integrated luminosity, the potential for detecting heavy Higgs bosons varies significantly with their mass and $\tan\beta$. Heavy Higgs bosons below 2 TeV are within the testable range, while those heavier than 7 TeV fall below the exclusion and discovery thresholds, rendering them undetectable. For masses between 2 and 7 TeV, heavy Higgs bosons with $\tan\beta$ less than 20 can be detected, whereas those with $\tan\beta$ greater than 20 are beyond the current discovery or exclusion capabilities. |
hep-ph/0308010 | Ingo Schienbein | I. Schienbein and J.-Y. Yu | Pion absorption and rescattering in the ANP model revisited | 8 pp. To appear in the proceedings of 2nd International Workshop on
Neutrino - Nucleus Interactions in the Few GeV Region (NUINT 02), Irvine,
California, 12-15 Dec 2002 | null | null | null | hep-ph | null | Single pion leptoproduction in the region of the (3,3) resonance is currently
of high interest for at least two reasons: (i) These reactions constitute an
important part of the total cross section in low energy reactions and are
utilized to detect neutrino oscillations in current and future long baseline
experiments. (ii) Intranuclear rescattering of the pions in heavy nuclei
results in interesting and sizable modifications of the free nucleon cross
sections which are testable in electroproduction experiments. In this article
we give a basic introduction to the pion multiple scattering model of Adler,
Nussinov, and Paschos (ANP) with special emphasis on pion absorption. We also
estimate the probability of multiple scattering.
| [
{
"created": "Fri, 1 Aug 2003 11:19:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Schienbein",
"I.",
""
],
[
"Yu",
"J. -Y.",
""
]
] | Single pion leptoproduction in the region of the (3,3) resonance is currently of high interest for at least two reasons: (i) These reactions constitute an important part of the total cross section in low energy reactions and are utilized to detect neutrino oscillations in current and future long baseline experiments. (ii) Intranuclear rescattering of the pions in heavy nuclei results in interesting and sizable modifications of the free nucleon cross sections which are testable in electroproduction experiments. In this article we give a basic introduction to the pion multiple scattering model of Adler, Nussinov, and Paschos (ANP) with special emphasis on pion absorption. We also estimate the probability of multiple scattering. |
2012.08506 | Javier Fuentes-Mart\'in | Javier Fuentes-Martin, Matthias K\"onig, Julie Pag\`es, Anders Eller
Thomsen, Felix Wilsch | SuperTracer: A Calculator of Functional Supertraces for One-Loop EFT
Matching | 38 pages, 1 figure. The code and example notebooks are publicly
available at https://gitlab.com/supertracer/supertracer | JHEP 04 (2021) 281 | 10.1007/JHEP04(2021)281 | MITP-20-076, TUM-HEP-1302/20, ZU-TH-54/20 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present SuperTracer, a Mathematica package aimed at facilitating the
functional matching procedure for generic UV models. This package automates the
most tedious parts of one-loop functional matching computations. Namely, the
determination and evaluation of all relevant supertraces, including loop
integration and Dirac algebra manipulations. The current version of SuperTracer
also contains a limited set of output simplifications. However, a further
reduction of the output to a minimal basis using Fierz identities, integration
by parts, simplification of Dirac structures, and/or light field redefinitions
might still be necessary. The code and example notebooks are publicly available
at https://gitlab.com/supertracer/supertracer.
| [
{
"created": "Tue, 15 Dec 2020 18:56:28 GMT",
"version": "v1"
},
{
"created": "Sun, 1 Aug 2021 21:28:52 GMT",
"version": "v2"
}
] | 2021-08-03 | [
[
"Fuentes-Martin",
"Javier",
""
],
[
"König",
"Matthias",
""
],
[
"Pagès",
"Julie",
""
],
[
"Thomsen",
"Anders Eller",
""
],
[
"Wilsch",
"Felix",
""
]
] | We present SuperTracer, a Mathematica package aimed at facilitating the functional matching procedure for generic UV models. This package automates the most tedious parts of one-loop functional matching computations. Namely, the determination and evaluation of all relevant supertraces, including loop integration and Dirac algebra manipulations. The current version of SuperTracer also contains a limited set of output simplifications. However, a further reduction of the output to a minimal basis using Fierz identities, integration by parts, simplification of Dirac structures, and/or light field redefinitions might still be necessary. The code and example notebooks are publicly available at https://gitlab.com/supertracer/supertracer. |
1512.08563 | Li-Sheng Geng | Li-Sheng Geng and Eulogio Oset | Novel nonperturbative approach for radiative
$\bar{B}^0(\bar{B}^0_s)\rightarrow J/\psi \gamma$ decays | More justifications for the decay mechanism. Results remain the same.
To appear in Physical Review D | Phys. Rev. D 94, 014018 (2016) | 10.1103/PhysRevD.94.014018 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Radiative $\bar{B}^0(\bar{B}^0_s)\rightarrow J/\psi \gamma$ decays provide an
interesting case to test our understanding of (non)perturbative QCD and
eventually to probe physics beyond the standard model. Recently, the LHCb
Collaboration has reported an upper bound, updating the results of the BABAR
Collaboration. Previous theoretical predictions based on QCD factorization or
perturbative QCD have shown large variations due to different treatment of
nonfactorizable contributions and meson-photon transitions. In this paper, we
report on a novel approach to estimate the decay rates, which is based on a
recently proposed model for $B$ decays and the vector meson dominance
hypothesis, widely tested in the relevant energy regions. The predicted
branching ratios are $\mathrm{Br}[\bar{B}^0\rightarrow
J/\psi\gamma]=\left(3.50\pm0.34^{+1.12}_{-0.63}\right)\times10^{-8}$ and
$\mathrm{Br}[\bar{B}^0_s\rightarrow
J/\psi\gamma]=\left(7.20\pm0.68^{+2.31}_{-1.30}\right)\times10^{-7}$. The first
uncertainty is systematic and the second is statistical, originating from the
experimental $\bar{B}^0_s\rightarrow J/\psi \phi$ branching ratio.
| [
{
"created": "Tue, 29 Dec 2015 00:05:07 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Jul 2016 08:51:15 GMT",
"version": "v2"
}
] | 2016-07-27 | [
[
"Geng",
"Li-Sheng",
""
],
[
"Oset",
"Eulogio",
""
]
] | Radiative $\bar{B}^0(\bar{B}^0_s)\rightarrow J/\psi \gamma$ decays provide an interesting case to test our understanding of (non)perturbative QCD and eventually to probe physics beyond the standard model. Recently, the LHCb Collaboration has reported an upper bound, updating the results of the BABAR Collaboration. Previous theoretical predictions based on QCD factorization or perturbative QCD have shown large variations due to different treatment of nonfactorizable contributions and meson-photon transitions. In this paper, we report on a novel approach to estimate the decay rates, which is based on a recently proposed model for $B$ decays and the vector meson dominance hypothesis, widely tested in the relevant energy regions. The predicted branching ratios are $\mathrm{Br}[\bar{B}^0\rightarrow J/\psi\gamma]=\left(3.50\pm0.34^{+1.12}_{-0.63}\right)\times10^{-8}$ and $\mathrm{Br}[\bar{B}^0_s\rightarrow J/\psi\gamma]=\left(7.20\pm0.68^{+2.31}_{-1.30}\right)\times10^{-7}$. The first uncertainty is systematic and the second is statistical, originating from the experimental $\bar{B}^0_s\rightarrow J/\psi \phi$ branching ratio. |
hep-ph/9710510 | Robert Kaminski | Chueng-Ryong Ji, Robert Kaminski, Leonard Lesniak, Adam Szczepaniak,
Robert Williams | Coupled Channel Analysis of S-Wave Pion-Pion and Kaon-Kaon
Photoproduction | 40 pages including 18 figures, minor modifications | Phys.Rev.C58:1205-1217,1998 | 10.1103/PhysRevC.58.1205 | INP-1769/PH, Cracow, Poland | hep-ph | null | We present a coupled channel partial wave analysis of nondiffractive S-wave
pi+ pi- and K+ K- photoproduction focusing on the KK threshold. Final state
interactions are included. We calculate total cross sections, angular and
effective mass distributions in both pion-pion and kaon-antikaon channels. Our
results indicate that these processes are experimentally measurable and
valuable information on the f0(980) resonance structure can be obtained.
| [
{
"created": "Tue, 28 Oct 1997 16:12:37 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Oct 1997 11:00:25 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Feb 1999 11:00:24 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Ji",
"Chueng-Ryong",
""
],
[
"Kaminski",
"Robert",
""
],
[
"Lesniak",
"Leonard",
""
],
[
"Szczepaniak",
"Adam",
""
],
[
"Williams",
"Robert",
""
]
] | We present a coupled channel partial wave analysis of nondiffractive S-wave pi+ pi- and K+ K- photoproduction focusing on the KK threshold. Final state interactions are included. We calculate total cross sections, angular and effective mass distributions in both pion-pion and kaon-antikaon channels. Our results indicate that these processes are experimentally measurable and valuable information on the f0(980) resonance structure can be obtained. |
hep-ph/9609455 | Kingman Cheung | Kingman Cheung and Dennis Silverman | Limits on Anomalous Couplings of Quarks From Prompt Photon Data | LaTeX2e, using the package-graphicx, 3 figures. It will appear in the
Proceedings of the 1996 DPF/DPB Summer Study on New Direction for High Energy
Physics, Snowmass, CO | null | null | UTEXAS-HEP-96-14, UCI-TR-96-33 | hep-ph | null | Prompt photon production has been known to be a sensitive probe to the gluon
luminosity inside a hadron because it is mainly produced by quark-gluon
scattering. For the same reason prompt photon production should also be
sensitive to the anomalous couplings of gluons to quarks. We will examine the
effects of two specific anomalous couplings -- chromoelectric and
chromomagnetic dipole moments of quarks -- on the prompt photon production.
Using the data collected by CDF and D0 at the Tevatron we put a bound on the
these anomalous couplings.
| [
{
"created": "Tue, 24 Sep 1996 19:54:35 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cheung",
"Kingman",
""
],
[
"Silverman",
"Dennis",
""
]
] | Prompt photon production has been known to be a sensitive probe to the gluon luminosity inside a hadron because it is mainly produced by quark-gluon scattering. For the same reason prompt photon production should also be sensitive to the anomalous couplings of gluons to quarks. We will examine the effects of two specific anomalous couplings -- chromoelectric and chromomagnetic dipole moments of quarks -- on the prompt photon production. Using the data collected by CDF and D0 at the Tevatron we put a bound on the these anomalous couplings. |
0708.3526 | Hyun-Chul Kim | Klaus Goeke, Hyun-Chul Kim, M.M. Musakhanov, Marat Siddikov | 1/N_c corrections to the magnetic susceptibility of the QCD vacuum | 18 pages, 5 figures. Final version to appear in Phys. Rev. D | Phys.Rev.D76:116007,2007 | 10.1103/PhysRevD.76.116007 | PNU-NTG-09/2007 | hep-ph | null | We investigate the magnetic susceptibility of the QCD vacuum with the $1/N_c$
corrections taken into account, based on the instanton vacuum. Starting from
the instanton liquid model we derive the gauged light-quark partition function
in the presence of the current quark mass as well as of external Abelian vector
and tensor fields. We consider the $1/N_c$ meson-loop corrections which are
shown to contribute to the magnetic susceptibility by around 15% for the up
(and down) quarks. We also take into account the tensor terms of the
quark-quark interaction from the instanton vacuum as well as the finite-width
effects, both of which are of order $\mathcal{O}(1/N_c)$. The effects of the
tensor terms and finite width turn out to be negligibly small. The final
results for the up-quarks are given as: $\chi< i\psi^\dagger \psi>_0 \simeq
35-40 \mathrm{MeV}$ with the quark condensate $<i\psi^\dagger \psi>_0$. We also
discuss the pion mass dependence of the magnetic susceptibility in order to
give a qualitative guideline for the chiral extrapolation of lattice data.
| [
{
"created": "Mon, 27 Aug 2007 02:20:50 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Sep 2007 01:39:04 GMT",
"version": "v2"
},
{
"created": "Sat, 17 Nov 2007 06:34:04 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Goeke",
"Klaus",
""
],
[
"Kim",
"Hyun-Chul",
""
],
[
"Musakhanov",
"M. M.",
""
],
[
"Siddikov",
"Marat",
""
]
] | We investigate the magnetic susceptibility of the QCD vacuum with the $1/N_c$ corrections taken into account, based on the instanton vacuum. Starting from the instanton liquid model we derive the gauged light-quark partition function in the presence of the current quark mass as well as of external Abelian vector and tensor fields. We consider the $1/N_c$ meson-loop corrections which are shown to contribute to the magnetic susceptibility by around 15% for the up (and down) quarks. We also take into account the tensor terms of the quark-quark interaction from the instanton vacuum as well as the finite-width effects, both of which are of order $\mathcal{O}(1/N_c)$. The effects of the tensor terms and finite width turn out to be negligibly small. The final results for the up-quarks are given as: $\chi< i\psi^\dagger \psi>_0 \simeq 35-40 \mathrm{MeV}$ with the quark condensate $<i\psi^\dagger \psi>_0$. We also discuss the pion mass dependence of the magnetic susceptibility in order to give a qualitative guideline for the chiral extrapolation of lattice data. |
1801.06458 | Paolo Torrielli | Lorenzo Magnea, Ezio Maina, Paolo Torrielli, Sandro Uccirati | Towards analytic local sector subtraction at NNLO | 10 pages, contribution to the proceedings of `RADCOR 2017', St.
Gilgen (Austria), September 2017 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new method for local subtraction at next-to-next-to-leading order in QCD is
sketched, attempting to conjugate the minimal counterterm structure arising
from a sector partition of the radiation phase space with the simplifications
following from analytic integration of the counterterms.
| [
{
"created": "Fri, 19 Jan 2018 15:24:56 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Jul 2018 14:24:50 GMT",
"version": "v2"
}
] | 2018-07-25 | [
[
"Magnea",
"Lorenzo",
""
],
[
"Maina",
"Ezio",
""
],
[
"Torrielli",
"Paolo",
""
],
[
"Uccirati",
"Sandro",
""
]
] | A new method for local subtraction at next-to-next-to-leading order in QCD is sketched, attempting to conjugate the minimal counterterm structure arising from a sector partition of the radiation phase space with the simplifications following from analytic integration of the counterterms. |
hep-ph/0404020 | Toshifumi Yamashita | Nobuhiro Maekawa and Toshifumi Yamashita | Horizontal symmetry in Higgs sector of GUT with U(1)_A symmetry | 35 pages | JHEP 0407 (2004) 009 | 10.1088/1126-6708/2004/07/009 | KUNS-1906 | hep-ph | null | In a series of papers, we pointed out that an anomalous $U(1)_A$ gauge
symmetry naturally solves various problems in grand unified theories (GUTs) and
that a horizontal gauge symmetry, $SU(2)_H$ or $SU(3)_H$, not only realizes the
unification of three generation quarks and leptons in fewer multiplets but also
solves the supersymmetric flavor problem. In this paper, we examine the
possibility that the Higgs sectors of the GUT symmetry and of the horizontal
symmetry are unified, that is, there are some Higgs fields whose vacuum
expectation values (VEVs) break both the GUT gauge symmetry and the horizontal
symmetry at the same time. Although the scale of the VEVs become too large to
suppress the flavor changing neutral current processes sufficiently, the
unification is possible. In addition, for the $SU(3)_H$ models, the $SU(3)_H$
gauge anomaly is cancelled in the unified models without introducing additional
fields in contrast with the previous models in which the Higgs sectors are not
unified.
| [
{
"created": "Fri, 2 Apr 2004 12:09:21 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Maekawa",
"Nobuhiro",
""
],
[
"Yamashita",
"Toshifumi",
""
]
] | In a series of papers, we pointed out that an anomalous $U(1)_A$ gauge symmetry naturally solves various problems in grand unified theories (GUTs) and that a horizontal gauge symmetry, $SU(2)_H$ or $SU(3)_H$, not only realizes the unification of three generation quarks and leptons in fewer multiplets but also solves the supersymmetric flavor problem. In this paper, we examine the possibility that the Higgs sectors of the GUT symmetry and of the horizontal symmetry are unified, that is, there are some Higgs fields whose vacuum expectation values (VEVs) break both the GUT gauge symmetry and the horizontal symmetry at the same time. Although the scale of the VEVs become too large to suppress the flavor changing neutral current processes sufficiently, the unification is possible. In addition, for the $SU(3)_H$ models, the $SU(3)_H$ gauge anomaly is cancelled in the unified models without introducing additional fields in contrast with the previous models in which the Higgs sectors are not unified. |
2406.07321 | Chris White | Chris D. White and Martin J. White | The magic of entangled top quarks | 22 pages, 6 figures | null | null | ADP-24-10/T1249 | hep-ph hep-ex hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | Recent years have seen an increasing body of work examining how quantum
entanglement can be measured at high energy particle physics experiments,
thereby complementing traditional table-top experiments. This raises the
question of whether more concepts from quantum computation can be examined at
colliders, and we here consider the property of magic, which distinguishes
those quantum states which have a genuine computational advantage over
classical states. We examine top anti-top pair production at the LHC, showing
that nature chooses to produce magic tops, where the amount of magic varies
with the kinematics of the final state. We compare results for individual
partonic channels and at proton-level, showing that averaging over final states
typically increases magic. This is in contrast to entanglement measures, such
as the concurrence, which typically decrease. Our results create new links
between the quantum information and particle physics literatures, providing
practical insights for further study.
| [
{
"created": "Tue, 11 Jun 2024 14:50:56 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jun 2024 10:26:04 GMT",
"version": "v2"
}
] | 2024-06-13 | [
[
"White",
"Chris D.",
""
],
[
"White",
"Martin J.",
""
]
] | Recent years have seen an increasing body of work examining how quantum entanglement can be measured at high energy particle physics experiments, thereby complementing traditional table-top experiments. This raises the question of whether more concepts from quantum computation can be examined at colliders, and we here consider the property of magic, which distinguishes those quantum states which have a genuine computational advantage over classical states. We examine top anti-top pair production at the LHC, showing that nature chooses to produce magic tops, where the amount of magic varies with the kinematics of the final state. We compare results for individual partonic channels and at proton-level, showing that averaging over final states typically increases magic. This is in contrast to entanglement measures, such as the concurrence, which typically decrease. Our results create new links between the quantum information and particle physics literatures, providing practical insights for further study. |
2202.08858 | M.C. David Marsh | Ricardo Z. Ferreira, M.C. David Marsh and Eike M\"uller | Do direct detection experiments constrain axionlike particles coupled to
electrons? | 4 pages, 2 figures. v2: references added, typos corrected (results
unchanged) | null | 10.1103/PhysRevLett.128.221302 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Several laboratory experiments have published limits on axionlike particles
(ALPs) with feeble couplings to electrons and masses in the keV-MeV range,
under the assumption that such ALPs comprise the dark matter. We note that ALPs
decay radiatively into photons, and show that for a large subset of the
parameter space ostensibly probed by these experiments, the lifetime of the
ALPs is shorter than the age of the universe. Such ALPs cannot consistently
make up the dark matter, which significantly affects the interpretation of
published limits from GERDA, Edelweiss-III, SuperCDMS and Majorana. Moreover,
constraints from gamma-ray and X-ray astronomy exclude an even wider range of
the ALP-electron coupling, and supersede all current experimental limits on
dark matter ALPs in the 6 keV to 1 MeV mass range. These conclusions are rather
model-independent, and can only be avoided at the expense of significant
fine-tuning in theories where the ALP has additional couplings to other
particles.
| [
{
"created": "Thu, 17 Feb 2022 19:01:41 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Feb 2022 17:12:47 GMT",
"version": "v2"
}
] | 2022-06-15 | [
[
"Ferreira",
"Ricardo Z.",
""
],
[
"Marsh",
"M. C. David",
""
],
[
"Müller",
"Eike",
""
]
] | Several laboratory experiments have published limits on axionlike particles (ALPs) with feeble couplings to electrons and masses in the keV-MeV range, under the assumption that such ALPs comprise the dark matter. We note that ALPs decay radiatively into photons, and show that for a large subset of the parameter space ostensibly probed by these experiments, the lifetime of the ALPs is shorter than the age of the universe. Such ALPs cannot consistently make up the dark matter, which significantly affects the interpretation of published limits from GERDA, Edelweiss-III, SuperCDMS and Majorana. Moreover, constraints from gamma-ray and X-ray astronomy exclude an even wider range of the ALP-electron coupling, and supersede all current experimental limits on dark matter ALPs in the 6 keV to 1 MeV mass range. These conclusions are rather model-independent, and can only be avoided at the expense of significant fine-tuning in theories where the ALP has additional couplings to other particles. |
1305.6457 | Marek Karliner | Yitzhak Frishman and Marek Karliner | Tetraquarks, their Masses and Decays in QED_2 | LaTeX, 9 pages, 2 figures; notation clarified, some minor corrections | null | 10.1007/JHEP08(2013)096 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent observations by Belle and BESIII of charged quarkonium-like resonances
give new stimulus for theoretical investigation of exotic hadrons in general
and heavy tetraquarks in particular. We use QED_2, a confining theory, as a
model for the masses and decays of tetraquarks. Here we discuss the states (Q
Qbar q qbar) and (Q Q qbar qbar) (and its anti-particle), where Q and q are two
fermion flavors with masses M and m, so that M > m. We then discuss decay modes
of these states into (Q Qqbar), (q qbar), (Q qbar), (Qbar q). It turns out that
(Q Qbar q qbar) is stable, while (Q Q qbar qbar) is not.
| [
{
"created": "Tue, 28 May 2013 11:43:53 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Jun 2013 13:14:30 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Jun 2013 08:57:19 GMT",
"version": "v3"
}
] | 2015-06-16 | [
[
"Frishman",
"Yitzhak",
""
],
[
"Karliner",
"Marek",
""
]
] | Recent observations by Belle and BESIII of charged quarkonium-like resonances give new stimulus for theoretical investigation of exotic hadrons in general and heavy tetraquarks in particular. We use QED_2, a confining theory, as a model for the masses and decays of tetraquarks. Here we discuss the states (Q Qbar q qbar) and (Q Q qbar qbar) (and its anti-particle), where Q and q are two fermion flavors with masses M and m, so that M > m. We then discuss decay modes of these states into (Q Qqbar), (q qbar), (Q qbar), (Qbar q). It turns out that (Q Qbar q qbar) is stable, while (Q Q qbar qbar) is not. |
hep-ph/9806211 | null | Hsiang-nan Li | Small-x evolution with Q dependence and unitarity | 12 pages in Latex | null | null | NCKU-HEP-98-06 | hep-ph | null | We propose a modified Balitsky-Fadin-Kuraev-Lipatov equation from the
viewpoint of the resummation technique, which contains an intrinsic dependence
on momentum transfer Q, and satisfies the unitarity bound. The idea is to relax
the strong rapidity ordering and to restrict phase space for real gluon
emissions in the evaluation of the BFKL kernel. It is shown that the power-law
rise of the gluon distribution function with the small Bjorken variable x turns
into a logarithmic rise, and that the predictions for the proton structure
function $F_2(x,Q^2)$ are consistent with the HERA data.
| [
{
"created": "Mon, 1 Jun 1998 07:41:33 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Li",
"Hsiang-nan",
""
]
] | We propose a modified Balitsky-Fadin-Kuraev-Lipatov equation from the viewpoint of the resummation technique, which contains an intrinsic dependence on momentum transfer Q, and satisfies the unitarity bound. The idea is to relax the strong rapidity ordering and to restrict phase space for real gluon emissions in the evaluation of the BFKL kernel. It is shown that the power-law rise of the gluon distribution function with the small Bjorken variable x turns into a logarithmic rise, and that the predictions for the proton structure function $F_2(x,Q^2)$ are consistent with the HERA data. |
1207.6233 | Norma Susana Mankoc Borstnik | Norma Susana Mankoc Borstnik | How many scalar fields there are and how are they related to fermions
and weak bosons in the spin-charge-family theory? | 16 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spin-charge-family theory offers a possible explanation for the
assumptions of the standard model, interpreting the standard model as its low
energy effective manifestation. The standard model Higgs and Yukawa couplings
are explained as an effective replacement for several scalar fields, all of
bosonic (adjoint) representations with respect to all the charge groups, with
the family groups included. Assuming the Lagrange function for all scalar
fields to be of the renormalizable kind, properties of the scalar fields on the
tree level are discussed. Free scalar fields (mass eigenstates) differ from
either those, which couple to $Z_m$, or to $W^{\pm}_{m}$ or to each family
member of each of the four families, which further differ among themselves.
Consequently the spin-charge-family theory predictions differ from those of the
standard model.
| [
{
"created": "Thu, 26 Jul 2012 10:36:26 GMT",
"version": "v1"
}
] | 2012-07-27 | [
[
"Borstnik",
"Norma Susana Mankoc",
""
]
] | The spin-charge-family theory offers a possible explanation for the assumptions of the standard model, interpreting the standard model as its low energy effective manifestation. The standard model Higgs and Yukawa couplings are explained as an effective replacement for several scalar fields, all of bosonic (adjoint) representations with respect to all the charge groups, with the family groups included. Assuming the Lagrange function for all scalar fields to be of the renormalizable kind, properties of the scalar fields on the tree level are discussed. Free scalar fields (mass eigenstates) differ from either those, which couple to $Z_m$, or to $W^{\pm}_{m}$ or to each family member of each of the four families, which further differ among themselves. Consequently the spin-charge-family theory predictions differ from those of the standard model. |
2312.14868 | Maksym Ovchynnikov | Martina Ferrillo, Maksym Ovchynnikov, Filippo Resnati, Albert De Roeck | Improving the potential of BDF@SPS to search for new physics with liquid
argon time projection chambers | journal version | JHEP 02 (2024) 196 | 10.1007/JHEP02(2024)196 | null | hep-ph physics.ins-det | http://creativecommons.org/licenses/by/4.0/ | Beam dump experiments proposed at the SPS are perfectly suited to explore the
parameter space of models with long-lived particles, thanks to the combination
of a large intensity with a high proton beam energy. In this paper, we study
how the exploration power may be augmented further by installing a detector
based on liquid argon time projection chamber technology. In particular, we
consider several signatures of new physics particles that may be uniquely
searched for with such a detector, including double bang events with heavy
neutral leptons, inelastic light dark matter, and millicharged particles.
| [
{
"created": "Fri, 22 Dec 2023 17:45:56 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Mar 2024 08:56:03 GMT",
"version": "v2"
}
] | 2024-03-08 | [
[
"Ferrillo",
"Martina",
""
],
[
"Ovchynnikov",
"Maksym",
""
],
[
"Resnati",
"Filippo",
""
],
[
"De Roeck",
"Albert",
""
]
] | Beam dump experiments proposed at the SPS are perfectly suited to explore the parameter space of models with long-lived particles, thanks to the combination of a large intensity with a high proton beam energy. In this paper, we study how the exploration power may be augmented further by installing a detector based on liquid argon time projection chamber technology. In particular, we consider several signatures of new physics particles that may be uniquely searched for with such a detector, including double bang events with heavy neutral leptons, inelastic light dark matter, and millicharged particles. |
0709.2235 | Masakiyo Kitazawa | Masakiyo Kitazawa, Dirk H. Rischke and Igor A. Shovkovy | Bound diquarks and their Bose-Einstein condensation in strongly coupled
quark matter | 7 pages, 6 figures | Phys.Lett.B663:228-233,2008 | 10.1016/j.physletb.2008.03.067 | null | hep-ph | null | We explore the formation of diquark molecules and their Bose-Einstein
condensation (BEC) in the phase diagram of three-flavor quark matter at nonzero
temperature, T, and quark chemical potential, mu. Using a quark model with a
four-fermion interaction, we identify possible diquark excitations as poles of
the microscopically computed diquark propagator. The quark masses are obtained
by solving a dynamical equation for the chiral condensate and are found to
determine the stability of the diquark excitations. The stability of diquark
excitations is investigated in the T-mu plane for different values of the
diquark coupling strength. We find that bound diquark molecules appear at small
quark chemical potentials at intermediate coupling and that BEC of non-strange
diquark molecules occurs if the attractive interaction between quarks is
sufficiently strong.
| [
{
"created": "Fri, 14 Sep 2007 09:09:01 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kitazawa",
"Masakiyo",
""
],
[
"Rischke",
"Dirk H.",
""
],
[
"Shovkovy",
"Igor A.",
""
]
] | We explore the formation of diquark molecules and their Bose-Einstein condensation (BEC) in the phase diagram of three-flavor quark matter at nonzero temperature, T, and quark chemical potential, mu. Using a quark model with a four-fermion interaction, we identify possible diquark excitations as poles of the microscopically computed diquark propagator. The quark masses are obtained by solving a dynamical equation for the chiral condensate and are found to determine the stability of the diquark excitations. The stability of diquark excitations is investigated in the T-mu plane for different values of the diquark coupling strength. We find that bound diquark molecules appear at small quark chemical potentials at intermediate coupling and that BEC of non-strange diquark molecules occurs if the attractive interaction between quarks is sufficiently strong. |
1702.00134 | Aiichi Iwazaki | Aiichi Iwazaki | Chiral Symmetry Breaking by Monopole Condensation | 7 pages, sectioning the manuscript | null | 10.1142/S0217751X17501391 | Nisho-2-2017 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Under the assumption of Abelian dominance in QCD, we have shown that chiral
condensate is locally present around each QCD monopole. The essence is that
either of charge or chirality of a quark is not conserved, when the low energy
massless quark collides with QCD monopole. In reality, the charge is conserved
so that the chirality is not conserved. Reviewing the presence of the local
chiral condensate, we show by using chiral anomaly that chiral non symmetric
quark pair production takes place when a quark is putted in a vacuum with
monopole condensation, while chiral symmetric pair production takes place in a
vacuum with no monopole condensation. Our results strongly indicate that the
chiral symmetry is broken by the monopole condensation.
| [
{
"created": "Wed, 1 Feb 2017 05:10:06 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jun 2017 01:12:23 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Jun 2017 02:48:12 GMT",
"version": "v3"
},
{
"created": "Tue, 1 Aug 2017 05:55:43 GMT",
"version": "v4"
}
] | 2017-09-13 | [
[
"Iwazaki",
"Aiichi",
""
]
] | Under the assumption of Abelian dominance in QCD, we have shown that chiral condensate is locally present around each QCD monopole. The essence is that either of charge or chirality of a quark is not conserved, when the low energy massless quark collides with QCD monopole. In reality, the charge is conserved so that the chirality is not conserved. Reviewing the presence of the local chiral condensate, we show by using chiral anomaly that chiral non symmetric quark pair production takes place when a quark is putted in a vacuum with monopole condensation, while chiral symmetric pair production takes place in a vacuum with no monopole condensation. Our results strongly indicate that the chiral symmetry is broken by the monopole condensation. |
hep-ph/9501342 | Volker Keiner | V. Keiner | A Spectator-Quark-Model for the Photoproduction of Kaons | 16 pages, LaTex, 10 figures included; packed with 'uufiles' utility | Z.Phys.A352:215,1995 | 10.1007/BF01298911 | Bonn TK-95-3 | hep-ph | null | A simple model for the photoproduction of kaons off protons with a lambda
hyperon in the final state is presented. In a quark model, the interaction is
modelled by the pair-creation of the (anti-) strange quarks in the final state
which recombine with the three quarks of the proton to form the lambda and
kaon. The calculated scattering cross sections for photon energies up to
$E_\gamma = 1.9 \; \mbox{GeV}$ are compared to experiment. The pair-creation
process is found to have a significant contribution to the total cross section.
| [
{
"created": "Thu, 19 Jan 1995 16:28:50 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Jan 1995 09:42:48 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"Keiner",
"V.",
""
]
] | A simple model for the photoproduction of kaons off protons with a lambda hyperon in the final state is presented. In a quark model, the interaction is modelled by the pair-creation of the (anti-) strange quarks in the final state which recombine with the three quarks of the proton to form the lambda and kaon. The calculated scattering cross sections for photon energies up to $E_\gamma = 1.9 \; \mbox{GeV}$ are compared to experiment. The pair-creation process is found to have a significant contribution to the total cross section. |
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